Meltblown die tip assembly and method

Description

FIELD

This disclosure relates to meltblown equipment, meltblown products, and fabrication methods.

BACKGROUND

Nonwoven sheet products, such as, for example, vacuum bags, bath wipes, tea bag filters, are often made by a conventional fabrication method called melt blowing. The related production or manufacturing equipment may be referred to as meltblown equipment and the related products may be referred to as meltblown products. Typically, the fabrication method first melts a thermoplastic polymer into a liquid or flowable form, then extrudes the polymer through nozzles (also known as a die tip), and blows high speed and high temperature gases around the nozzles to fiberize the polymer and deposit the fiberized polymer on a surface, such as a substrate surface. The deposited polymer is allowed to cure and form a nonwoven fabric sheet. These nonwoven sheet products may be used in various applications, such as, for example, filtration, sorbents, apparels, and drug delivery applications.

Polymers having thermoplastic properties are suitable for melt blowing because of their characteristics in transition between the liquid and solid states. The transition temperature is known as glass transition temperature and varies from polymer to polymer. These polymers include, for example, polypropylene, polystyrene, polyesters, polyurethane, polyamides, polyethylene, and polycarbonate. Because these polymers have different glass transition temperatures and flow characteristics (e.g., viscosity, adhesiveness, etc.), meltblown equipment is often limited by their ability to produce products with certain uniformity, fiber size, or both. The polymer fiber uniformity is often limited by the uniformity of the high speed air surrounding the die tip. Furthermore, these specific limitations may lead to an overall limited production rate that caps productivity and economic viability of such products. The limitations are further magnified when two or more meltblown die tips are used together in a formation process involving wood pulp or other fibers, such as in a multiform process.

SUMMARY

This disclosure describes melt blowing methods, assemblies, and systems that, in certain implementations, may improve one or more of product uniformity, fiber size, production rate, polymer production performance, and improved equipment and production operational efficiency. In one specific aspect, the disclosed meltblown die tip assembly produces more uniform high speed and high temperature airflows surrounding the die tip than traditional die tip assemblies. In certain implementations, the disclosed meltblown system produces more uniform output and reduced fiber sizes given certain polymer materials and production rates. More uniform output production efficiency may be achieved, in some implementations, through equipment design that allows for more thorough cleaning, and/or by having the equipment ready, such as on hot-standby, for replacement such that the maintenance down time can be lessened or minimized.

In general, the disclosed meltblown equipment includes a polymer beam and air chamber and a die tip assembly. The die tip assembly may be quickly attached, in certain implementations, onto or removed from the polymer beam and air chamber. The air chamber, along with an air feed system, may be included in an air heated beam for providing air to the die tip assembly. The air feed system can feed high velocity air though distribution holes to increase the heat transfer in the holes. The holes are located in locations to enable a corresponding structure (e.g., a plate) receiving the airflow to use the exiting air to increase the heat transfer efficiency. For example, the heat transfer efficiency may be increased on the die tip where airflow impinges, or at the air holes in the die tip, or both.

The die tip has airflows and drawn polymer converge at its nozzle, where highspeed uniform airflows of opposing sides entrain and draw out the polymer for fiberization. Because in certain implementations no fasteners or undesired obstructions are used in the airflow on polymer passageway or in or near the nozzle (as certain embodiments intentionally avoid such configurations with fasteners causing airflow obstructions), there is no disruption to the desired supply of air and/or polymer to the die tip nozzle. In particular, this disclosure shows an embodiment of a meltblown die tip structure that excludes any bolt head or countersink machined areas within approximately 10 cm (or 4″) of the nozzle exterior surface or in the airflow channels or passageways of the interior of the die's machined areas. This greatly enhances production and product uniformity.

In certain embodiments, the meltblown system includes a single input (e.g., a polymer material). The meltblown system may include tapered structures that facilitate flow of the input. Such tapered structures may be referred to as polymer distribution components. The assembly mechanisms used in some embodiments of the disclosed meltblown systems enable more convenient and thorough cleaning of the polymer distribution components with each use than traditional polymer distribution components. For example, when a mounting plate is used with the polymer distribution components, a single polymer seal (e.g., a single round seal may be used instead of a number of round seals or an elongated gasket on a channel) may be used. This allows for ease of cleaning offline in assembly areas and a simple installation in the machine. When no mounting plate is used, cleaning can be performed, in certain implementations, using a bottom plate of an air chamber or from a bottom access of the meltblown beam.

In specific instances, the die tip assembly used in the disclosed meltblown system is replaceable or interchangeable with another replacement die tip assembly, in a manner similar to cartridge replacement in printers. In other instances, the die tip assembly has air output that includes two streams of air entrained at a sharp or otherwise desired angle for the improved ability in producing fine polymer fibers. This may be dependent on the type of polymers being used and/or the type or desired characteristics of the product being produced. In yet some other instances, the die tip assembly also provides novel geometric settings, such as a setback distance and tip to tip distances, as further explained in the detailed description.

The disclosure presents one or more implementations of the die tip assembly that may provide other advantages over existing meltblown devices and methods. For example, the disclosed die tip assembly may provide a more optimized use of heated air in an non-obstructed manner. The die tip assembly, in certain implementations, may be adapted to compact sizes depending on specific requirements, such that two or more die tip assemblies can be arranged together during production, for example, in a configuration for combining with pulp fibers. In certain embodiments, the die tip assembly has a weld-in or machined-in strength rib structure for providing good geometric stability (examples provided in FIGS. 4B-4D).

In a first general aspect, a meltblown die tip assembly includes a mounting structure having at least one polymer flow passageway formed therein. The mounting structure is configured to receive a polymer flow, a first air passageway formed therein and configured to receive a first airflow, and a second air passageway formed therein and configured to receive a second airflow. The meltblown die tip assembly further includes an elongated die tip having a polymer flow chamber, a polymer flow tip, a first airflow regulation channel having a first impingement surface, a second airflow regulation channel having a second impingement surface, a first angled side, and a second angled side. The polymer flow chamber of the elongated die tip is in fluid communication with the at least one polymer flow passageway of the mounting structure at a first opening of the polymer flow chamber of the elongated die tip. The polymer flow chamber is configured to receive at least a portion of the polymer flow from the at least one polymer flow passageway of the mounting structure. The polymer flow chamber of the elongated die tip is in fluid communication with the elongated die tip at a first opening.

The polymer flow chamber of the elongated die tip is configured to receive at least a portion of the polymer flow from a first opening, the polymer flow chamber of the elongated die tip in fluid communication with the polymer flow tip at a second opening. The polymer flow tip is configured to receive at least a portion of the polymer flow from the polymer flow chamber at the second opening. The polymer flow tip, which may be considered the second opening in certain implementations, has a tip opening configured to dispense at least a portion of the polymer flow. The first airflow regulation channel is configured to receive the first airflow from the first air passageway of the mounting structure, regulate the first airflow using at least the first impingement surface, and dispense the first airflow adjacent the first angled side of the elongated die tip. The second airflow regulation channel is configured to receive the second airflow from the second air passageway of the mounting structure, regulate the second airflow using at least the second impingement surface, and dispense the second airflow adjacent the second angled side.

The meltblown die tip assembly further includes a first air plate positioned at least partially adjacent the first angled side of the elongated die tip and configured to form a first air exit passageway that is configured to receive the first airflow dispensed from the first airflow regulation channel of the elongated die tip and to dispense the first airflow adjacent the tip opening of the polymer flow tip and the at least a portion of the polymer flow to at least partially entrain such first airflow with the polymer flow. The assembly also includes a second air plate positioned at least partially adjacent the second angled side of the elongated die tip and configured to form a second air exit passageway that is configured to receive the second airflow dispensed from the second airflow regulation channel of the elongated die tip and to dispense the second airflow adjacent the tip opening of the polymer flow tip and the at least a portion of the polymer flow to at least partially entrain such second airflow with the polymer flow.

In some embodiments, the elongated die tip includes an impingement portion housing the first airflow regulation channel and the second airflow regulation channel. The first air regulation channel has a first impingement surface. The second airflow regulation channel has a second impingement surface. The first impingement surface and the second impingement surface assist with regulating the first airflow and the second airflow respectively. For example, the first impingement surface impinges or disrupts the first airflow in its initial traveling direction and thus forces the airflow to turn and reorganize or reassemble. In addition, the impact between the first airflow and the first impingement surface aids a transfer of energy from the first airflow to the impingement portion and thus the die tip. For example, the first and the second airflows may enter the meltblown system at a high temperature for maintaining the liquidity state of the polymer flow. The impingement portion, such as the first and the second impingement surfaces, provides a mechanism for efficient heat transfer and regulation of the uniformity of the first and the second airflows. In other embodiments, there may be multiple impingement surfaces in the airflow regulation channels.

In some other embodiments, the elongated die tip includes a neck portion narrower than the impingement portion and obstructing airflows exiting the first airflow regulation channel and the second airflow regulation channel.

In yet some other embodiments, the impingement portion includes a plurality of fastenable holes for receiving fasteners affixing the first air plate and the second air plate to the impingement portion of the elongated die tip. This may be achieved, using horizontally, vertically, or diagonally oriented fasteners, or combinations of the same.

In some embodiments, the elongated die tip and the first and the second air plates form a replaceable cartridge.

In some other embodiments, the meltblown die tip assembly further includes at least one breaker plate governing polymer flow from the polymer flow passageway of the mounting structure into the polymer flow chamber. The at least one breaker plate includes a plurality of holes for filtering and regulating the polymer flow. The at least one breaker plate can, in some embodiments, include two stacked breaker plates having one or more screen filter positioned between the two stacked breaker plates.

In yet some other embodiments, the first air plate and the second air plate are mounted onto the mounting structure using one or more fasteners that may be parallel to the polymer flow chamber.

In some embodiments, the first airflow regulation channel is configured to receive the first airflow from the first air passageway of the mounting structure, regulate the first airflow, transfer heat from the first airflow to the elongated die tip, and dispense the first airflow adjacent the first angled side of the elongated die tip; and wherein the second airflow regulation channel is configured to receive the second airflow from the second air passageway of the mounting structure, regulate the second airflow, transfer heat from the second airflow to the elongated die tip, and dispense the second airflow adjacent the second angled side of the elongated die tip.

In some other embodiments, the first and the second airflows cause the die tip assembly to maintain a temperature that maintains the polymer flow in a liquid state.

In yet some other embodiments, the polymer flow tip has an external angle of about 50 to about 90 degrees.

In some embodiments, the mounting structure and the elongated die tip are a unified piece. For example, the mounting structure and the elongated die tip may be considered a unified piece when bolted together, welded together, or otherwise combined or mounted (e.g., by adhesive). In other instances, the mounting structure and the elongated die tip are manufactured as one piece, which would also be considered a unified piece.

In some other embodiments, the elongated die tip further comprises an angled tip, the first air plate further comprises a first tip, and the second air plate further comprises a second tip, such that a vertical distance between the angled tip and a midpoint of the first tip and the second tip defines a setback dimension being about 0.5 mm to about 4.0 mm. A distance between the first tip and the second tip defines a tip-to-tip distance, such that a ratio of the setback dimension and the tip-to-tip distance is about 0.25 to about 2.5.

In yet some other embodiments, the at least one polymer flow passageway of the mounting structure includes an opening width near the first opening of the polymer flow chamber such that cleaning tools can access internal surfaces of the at least one polymer flow passageway of the mounting structure. The internal surfaces of the at least one polymer flow passageway of the mounting structure includes a tapered top surface for distributing the polymer flow.

In some embodiments, the first air plate includes a first outer surface. The second air plate includes a second outer surface. The first outer surface and the second outer surface form an angle between about 90 and about 140 degrees.

In some other embodiments, the meltblown die tip assembly further includes a meltblown beam fluidly connected with the mounting structure for supplying air and polymer. The meltblown beam and the mounting structure form a height above the die tip such that no other obstacle interferes with the surrounding air of the die tip in a region of control. The meltblown beam and the mounting structure are one unified piece.

In yet some other embodiments, the first airflow and the second airflow are entrained at a tip apex drawing the polymer flow and surrounding air such that no interfering structure is present within at least about 38 mm of the tip apex.

In some embodiments, the polymer flow chamber of the elongated die tip includes a rib structure connecting a first side wall of the polymer flow chamber to a second, opposing, side wall of the polymer flow chamber, wherein the rib structure has a cross sectional fluid dynamic shape to promote laminar flow in the polymer flow.

In some other embodiments, the first impingement surface is located at a top surface of the elongated die tip.

In yet some other embodiments, the first impingement surface is located within the first airflow regulation channel.

In a second general aspect, a die tip for polymer flow and air entrainment, the die tip may include a body portion, a polymer flow chamber, a polymer flow tip, a first airflow regulation channel, a first angled side, a second airflow regulation channel, and a second angled side opposed to the first angled side, the first angled side and the second angled side are positioned adjacent to or define the polymer flow tip. The polymer flow chamber receives a polymer flow and is configured to deliver the polymer flow to the polymer flow tip. The first airflow regulation channel receives a first airflow provided to the first angled side at accelerated speeds. The body portion includes at least one impingement surface impinging the first airflow for regulating the first airflow. The first angled side is provided adjacent to or defines part of the polymer flow tip such that the first airflow at accelerated speeds helps to draw and blows out the polymer flow from the polymer flow tip.

In some embodiments, the body portion includes a neck portion reducing a width of the body portion such that a transition surface from the neck portion to the first angled side impedes the first airflow exiting the first airflow regulation channel. The at least one impingement surface may include the transition surface.

In some other embodiments, the first angled side is adjacent a first air plate for directing and accelerating the first airflow impeded by the transition surface. The first airflow heats up the body portion of the die tip when the airflow impinges the transition surface impinges the airflow and help transfer heat from the first and second air flows to the die tip. The second airflow regulation channel receives a second airflow and sends the second airflow to the second angled side. The body portion includes a second impingement surface impinging a second airflow for regulating the second airflow in the second air regulation channel. The second airflow may be accelerated to a substantially same level of speeds as the first airflow when reached at the polymer flow tip such that both the first airflow and the second airflow are entrained to draw and blow out the polymer from the polymer flow tip.

In yet some other embodiments, the first airflow and the second airflow entrain to draw the polymer flow and blow or pull the polymer flow out of the polymer flow tip. In certain implementations, the first airflow and the second airflow are not impeded by or in contact with any fastener when the first airflow travels from the first airflow regulation channel to reach the polymer flow tip and the second airflow travels from the second airflow regulation channel to reach the polymer flow tip. The first airflow and the second airflow are not impeded for at least about 38 mm away from the polymer flow tip.

In some embodiments, the first air plate further includes a first tip, and the second air plate further includes a second tip, such that a vertical distance between the polymer flow tip and a midpoint of the first tip and the second tip defines a setback dimension being about 0.5 mm to about 4.0 mm. A distance between the first tip and the second tip defines a tip-to-tip distance, such that a ratio of the setback dimension and the tip-to-tip distance is about 0.25 to 2.5.

In a third general aspect, a meltblown die tip assembly includes a mounting structure having a polymer flow conduit and an airflow conduit. The meltblown die tip assembly includes a die tip at least partially sealingly attached to the mounting structure. The die tip receives a polymer flow from the polymer flow conduit of the mounting structure and receives an airflow from the airflow conduit of the mounting structure. The die tip includes an impingement surface receiving and reflecting the airflow to force the airflow to at least partially reassemble. An air plate is sealingly attached to the mounting structure and is mounted adjacent the die tip for providing a passage to accelerate the airflow exiting the die tip. The accelerated airflow draws the polymer flow from the die tip and fiberizes the polymer flow as desired.

In some embodiments, the die tip includes a second impingement surface between the die tip and the air plate, or in the die tip.

In a fourth general aspect, a method is disclosed for producing uniform or more uniform meltblown products by providing mere uniform airflows to a meltblown system. The method includes feeding pressurized air into one or more air passageways in a mounting structure to form a first airflow. The first airflow is impinged using a first impingement surface near an exit of the air passageway of the mounting structure. The first airflow impinged by the first impingement surface is then reassembled in a plenum or volume above or adjacent the first impingement surface. The reassembled first airflow passes into an air regulation channel. The reassembled first airflow is then accelerated to draw a polymer for melt blowing.

In some embodiments, the method further includes impinging the reassembled first airflow using a second impingement surface at a neck portion of a die tip and reassembling the first airflow impinged by the second impingement surface in a second plenum or volume above or adjacent the second impingement surface.

Detailed disclosure and examples are provided below.

BRIEF DESCRIPTION OF FIGURES

FIG. 1 is a perspective exploded view of a meltblown system.

FIG. 2A is a perspective exploded view of a first embodiment of a replacement cartridge of the die tip assembly used in the meltblown system of FIG. 1.

FIG. 2B is a perspective exploded view of another embodiment of a replacement cartridge of the die tip assembly used in the meltblown system of FIG. 1.

FIGS. 3A-3E are front views of different embodiments of the replacement cartridge of FIG. 2B.

FIGS. 3F-3J are cross sectional views of different embodiments of the replacement cartridge respectively corresponding to the examples shown in FIGS. 3A-3E.

FIG. 3K is a detailed cross sectional view showing the airflows in the embodiment of the replacement cartridge of FIG. 3I.

FIGS. 4A-4D are local cross sectional views of specific features of an embodiment of the die tip.

FIG. 5 is a local front view of an embodiment of the polymer flow tip of the die tip.

FIG. 6 is another local front view of an embodiment of the polymer flow tip of the die tip.

FIG. 7 includes a partial top view and a partial cross-sectional side view of the breaker plates used in an embodiment of the die tip assembly of FIG. 2.

FIGS. 8A and 8B are perspective see-through views showing polymer flow passageway in an implementation of a mounting structure.

FIG. 9 is an illustrative front view of an implementation of a meltblown system illustrating a region of control.

FIG. 10 is a plot of measurements of airflow uniformity produced by an example replacement cartridge incorporating features of the examples of FIGS. 3A-3J.

Like elements are labeled using like numerals.

DETAILED DESCRIPTION

This disclosure presents a meltblown system having a die tip assembly, and related meltblown methods capable of producing highly uniform meltblown materials. The meltblown system, in one or more embodiments, provides advanced operation in handling polymer materials that usually pose limitations to conventional meltblown machines and methods, such as, for example, in terms of fiber size, porosity, among others. The disclosed meltblown system, in certain embodiments for a given certain throughput (as measured by volume or mass per length per unit time), can produce uniform or more uniform polymer products having reduced fiber sizes, which is important to a desired product quality. The meltblown system may also provide several operational benefits, such as easy cleaning, rapid tool changing, uniform heating or cooling, uniform polymer flowing, and others. Details of one or more implementations of a meltblown system are described below.

FIG. 1 is a perspective exploded view of an embodiment of a meltblown system 100. The meltblown system 100 includes a die tip assembly 110, a meltblown beam 120, and one or more end plates 130. The meltblown beam 120 receives air from an external source from one or more conduits 122 and receives polymers in a liquid state from an external source via one or more conduits 124. Sources providing the air and polymers are well known in the art. The air, such as pressurized and/or heated air, is used to create a spray of liquid fibers of the liquid polymers. In the spray, long strings of fibers will land on a receiving surface or substrate and form a non-woven fabric sheet. This meltblowing process is achieved using the mechanisms inside the die tip assembly (also known as spinneret assembly) 110.

The die tip assembly 110 may include, in the example embodiment as shown, a mounting structure 112, a die tip 114, a first air plate 116, and a second air plate 118. The end plate 130 may assist with fastening these components of the die tip assembly 110 on an end. In some embodiments, another end plate (not shown) fastens certain components of the die tip assembly 110 on the other end. Specifically, the end plate 130 (as well as another end plate not shown) is fastenable to a frontal end of the elongated die tip 114, frontal ends of the two air plates 116 and 118, and a frontal end of the mounting structure 112 to have the assembly form a replacement cartridge such that the complete assembly can be quickly and conveniently replaced or exchanged while in hot standby mode without time-consuming dissembling of each component from the meltblown beam 120. The mounting structure 112 may include a polymer receiving conduit or hole 117 for receiving polymer from the beam 120. The mounting structure 112 also includes a slot or a number of holes 119 for receiving air. In some embodiments, the mounting structure includes two slots 119 and 126 positioned, in one implementation, symmetrically about the polymer receiving hole 117. Each of the slot 119 and 126 may include holes or conduits for providing air into the die tip assembly 110.

As further discussed below, the die tip 114 is assembled with the first air plate 116 and the second air plate 118 to create passages for airflow to accelerate to high speeds to perform the meltblowing process. The mounting structure 112 receives the polymer materials and air flow from the meltblown beam 120 and orderly feeds or directs them to the die tip 114 underneath. In some embodiments, the mounting structure 112 may be part of or integrated with the meltblown beam 120, and the die tip 114 and the first and the second air plates 116 and 118 are mounted below the mounting structure 112 of the meltblown beam 120. In some other embodiments, the mounting structure 112 may be part of the die tip 114 and receives the first and the second air plates 116 and 118. After assembly, the first air plate 116 and the second air plate 118 have a relatively large tip-to-tip distance. In some embodiments, the distance can be about 1.27 mm (or 0.05″), or in a range that includes such distance.

FIG. 2A is a perspective exploded view of a first embodiment of a replacement cartridge of the die tip assembly 110 used in the meltblown system 100 of FIG. 1. FIG. 2A does not show the one or more end plates 130 as illustrated in FIG. 1. The replacement cartridge may or may not include the separate one or more end plates 130 because an equivalent end sealing structure may be integrated with either one of the die tip 114, the first air plate 116, the second air plate 118, and the mounting structure 112. In the first embodiment illustrated in FIG. 2A, the replacement cartridge may be used as a whole unit, such that a new and heated replacement unit can be provided standby to swap with the mounted and used unit. Utilizing the exchangeability, the replacement cartridge increases the operational efficiency. In some other embodiments, the interchangeable portion may or may not include the mounting structure 112. For example, as shown in the second embodiment in FIG. 2B, the replacement cartridge needs not include the mounting structure 112, for example, when the mounting structure 112 is integrated with the meltblown beam 120 or with the die tip 114.

In FIG. 2A, the exploded view illustrates the assembly relationship of the components. The die tip 114, the first air plate 116, and the second air plate 118 may be affixed together. For example, the die tip 114 may have a plurality of fastener holes on both sides for fastenably receiving the air plates 116 and 118, such as by screws, bolts, or jigs. In other embodiments, the air plates may be affixed onto the die tip 114 using other known or available fastening methods, such as welding, woodwork joints, adhesives, or other temporary or permanent means. The die tip 114, the air plates 116 and 118 may then be assembled with the mounting structure 112. For example, vertical fasteners can be used to hold the air plates 116 and 118 toward the mounting structure 112. In other instances, vertical or diagonal fasteners can be used to hold the die tip 114 to the mounting structure 112. To ensure the precision of the assembly, in some embodiments, the die tip 114 with the first and the second air plates 116 and 118 may be aligned to the mounting structure 112 using at least one dowel pin.

In the embodiment illustrated in FIG. 2A, breaker plates 210 may be used in the cartridge assembly for regulating and/or filtering the polymer flow before the polymer flow reaches the die tip 114. In some instances, one breaker plate 210 may be used together with a filter or a screen 220. In other instances, and as shown in FIG. 2A, two or more breaker plates 210 are used with one or more filter or screen 220 positioned in between the two or more breaker plates 210 for filtering away unwanted substances, such as articles greater than certain sizes.

The breaker plates 210 and the filter 220 (if used) may be positioned anywhere along the polymer flow path, such as, for example, in an opening in the mounting structure 112 as shown in FIG. 2A or in an opening in the die tip 114 as shown in FIG. 2B. Although FIG. 2A shows the breaker plates 210 and the filter 220 are housed in an opening of the mounting structure 112 facing the meltblown beam 120, in other instances, the opening may be facing toward the die tip 114 (e.g., on the opposite side in the mounting structure 112). In yet some other embodiments, the opening receiving the breaker plates 210 and the filter 220 is located in the die tip 114 (as shown in FIG. 2B). In some other embodiments, the opening may be located inside the meltblown beam 120 above the mounting structure 112. Configurations may vary according to specific production demands.

FIG. 2B is a perspective exploded view of a second embodiment of the replacement cartridge of the die tip assembly 110 used in the meltblown system of FIG. 1. In this embodiment, the mounting structure 112 is not replaced or included in the replacement cartridge and the breaker plates 210 and filter 220 (if used) are installed inside the die tip 114. In the second embodiment, the mounting structure 112 may be part of the meltblown beam 120 or may not require replacement due to operation conditions. For example, in this embodiment, when the breaker plates 210 were clogged or having reduced flow efficiency, or when the die tip 114 required cleaning, only the die tip 114 and the first and the second air plates 116 and 118 are replaced, along, as needed, with the one or more breaker plate 210 and one or more filter or screen 220 if so applied.

Turning to FIGS. 3A through 3E, these figures show a front view of the die tip assembly 110 in different embodiments, showing the relationship of the components when they are assembled. Corresponding to FIGS. 3A through 3E, FIGS. 3F through 3J respectively present the cross sectional views. The cross sectional views provide a clear showing of the boundaries between two adjacent components. In some embodiments, the boundaries and holes or cavities thereof represented in the cross sections in FIGS. 3F-3J may or may not be within a same plane as shown. For example, the first air passageway 340 and the first air regulation channel 352 are shown to be in a same plane in the cross sectional views; but they can be located in different planes in other embodiments. In other embodiments, the features shown on the left side and the right side may be offset into or out of the plane (i.e., may not be symmetrical in a cross sectional view as shown). Although these five embodiments each has specific features, the illustrated features may be otherwise combined or altered as suggested by someone having ordinary skills in the art, using at least one or all of the presented features, depending on dimensional limitations, performance requirements, or cost concerns. These five embodiments share some common features that are discussed as follows.

The mounting structure 112 has a top mounting surface 310 and a bottom mounting surface 320. The mounting structure 112 includes at least one polymer flow passageway 330, receive a polymer flow from the meltblown beam 120. The mounting structure 112 includes a first air passageway 340 formed therein. As aforementioned, in certain embodiments, the mounting structure 112 may be integrated with either the meltblown beam 120 or the die tip 114. For example, the top mounting surface 310 and the bottom mounting surface 320 may be nonexistent in different embodiments. The top mounting surface 310 may not exist when the mounting structure 112 is integrated with the meltblown beam 120. Alternatively, the bottom mounting surface 320 may not exist when the mounting structure 112 is part of the die tip 114. Having the mounting structure 112 as a separate piece, as in the embodiments shown in FIGS. 3A-3J, can provide machining, maintenance, and assembly advantages.

The first air passageway 340 is configured to receive a first airflow from the meltblown beam 120. The mounting structure 112 further includes a second air passageway 342 formed therein. The second air passageway 342 receives a second airflow from the meltblown beam 120. In the embodiment illustrated, the first air passageway 340 and the second air passageway 342 are symmetrical about the polymer flow passageway 330. However, in other embodiments, the first and the second air passageways 340 and 342 may be placed at different locations, and/or may be offset in different planes.

The elongated die tip 114 is attached below the mounting structure 112 via, in certain implementations, at least partially through the first and the second air plates 116 and 118. The die tip 114 has a polymer flow chamber 350. The polymer flow chamber 350 receives polymer flow from the polymer flow passageway 330. The die tip 114 includes a body portion 360 and a polymer flow tip 372. The body portion 360 includes a first airflow regulation channel 352 and a second airflow regulation channel 354 disposed on opposing sides of the polymer flow chamber 350. The body portion 360 includes a first angled side 362 and a second angled side 364. The polymer flow tip 372 may be positioned a vertical distance away from an imaginary horizontal line between the tips of the first and the second air plates 116 and 118. This vertical distance is referred to as “setback,” which in one implementation may be about 0.5 mm (about 0.02″), or about 0.25 to about 2.5 times of the tip-to-tip distance (about 1.27 mm) of the first and the second air plates 116 and 118. In certain embodiments, the setback may be about 0.5-1.8 times of the tip-to-tip distance of the first and the second air plates 116 and 118.

As shown in FIGS. 3A-3E, the polymer flow chamber 350 is in fluid communication with the at least one polymer flow passageway 330 of the mounting structure 112 at a first opening 358 of the polymer flow chamber 350. The polymer flow chamber 350 is configured to receive at least a portion of the polymer flow from the at least one polymer flow passageway 330 of the mounting structure 112. The polymer flow passageway 330 may include an increased width near the first opening 359 of the polymer flow chamber 350 such that cleaning tools can access internal surface of the at least one polymer flow passageway of the mounting structure 112. In other embodiments, the polymer flow passageway 330 may have different shapes or configurations that vary from the illustration shown in FIGS. 3A-3J. Two example variations for the polymer flow passageway 330 are provided in FIGS. 8A and 8B.

Temporarily turning to FIGS. 8A and 8B, examples of a polymer flow passageway 804 are illustrated to be used in the place of the polymer flow passageway 330. FIGS. 8A and 8B show perspective views of the polymer flow passageway 804 in an implementation in the mounting structure 112. The polymer flow passage way 804 generally includes a bottom opening 810 corresponding to the first opening 358, a tapered distribution portion 803, and a vertical distribution portion 800. However, specific configurations of the polymer flow passageway 804 can vary, as described below.

In FIG. 8A, the polymer flow passageway 804 includes an inlet 802, a tapered distribution portion 803, and a vertical distribution portion 800 connecting the bottom opening 810 to the tapered distribution portion 803. The internal surfaces of the at least one polymer flow passageway 804 may include a tapered top surface, such as the upper surface of the tapered distribution portion 803. The opening width of the vertical distribution portion 800 may vary depending on the intended flow rate. For example, FIG. 8A illustrates that the opening width of the vertical distribution portion 800 matches the width of the tapered distribution portion 803. In other embodiments, the opening width of the vertical distribution portion 800 may be narrower than the width of the tapered distribution portion 803, as shown in FIG. 8B. In FIG. 8B, two or more repeating inlets 802, tapered distribution portions 803 may be provided for an even distribution of the polymer flow a crossing a large width given certain height constraints. Although only two repetitions are shown in FIG. 8B, more repetitions may be added.

Returning to FIGS. 3A through 3J, the polymer flow passageway 330 is in fluid communication with the polymer flow chamber 350 at a first opening 359. The polymer flow chamber 350 is configured to receive at least a portion of the polymer flow from the polymer flow passageway 330 at the first opening 359, for example, via one or more breaker plates 202 (e.g., in FIGS. 2A and 2B). The polymer flow chamber 350 is in fluid communication with the polymer flow tip 372 at a second opening 384. The polymer flow chamber 350, the first opening 359, the second opening 384, and the polymer flow tip 372 are machined or otherwise hollowed from the body portion 360 of the elongated die tip 114. The polymer flow tip 372 receives at least a portion of the polymer flow from the polymer flow chamber 350 at the second opening 384 polymer flow chamber 350. The polymer flow tip 372 has a tip opening (see FIG. 5) configured to dispense at least a portion of the polymer flow.

The first airflow regulation channel 352 is configured to receive the first airflow from the first air passageway 340 of the mounting structure 112. The first airflow regulation channel 352 regulates the first airflow and dispense the first airflow adjacent the first angled side 362. Similarly, the second airflow regulation channel 354 is configured to receive the second airflow from the second air passageway 342 of the mounting structure 112. The second air flow regulation channel 354 assists in regulating the second airflow and dispenses the second airflow adjacent the second angled side 364.

The first airflow regulation channel 352 and the second airflow regulation channel 354 regulate the respective first and second airflows by providing a restricted flow cross section along a direction, such as a uniform direction, such that the first and second airflows exit the first and second airflow regulation channels 352 and 354 at a calculated or desired accelerated speed. The exit speed corresponds to a known initial system pressure, such as the pressure provided to the system at the source of air.

In some embodiments, the elongated die tip 114 includes an impingement portion 361 housing the first airflow regulation channel 352 and the second airflow regulation channel 354. The first air regulation channel 352 has a first impingement surface 353. The second airflow regulation channel has a second impingement surface 355. The first impingement surface 353 and the second impingement surface 355 regulate the first airflow and the second airflow respectively. For example, the first impingement surface 353 impinges or disrupts the first airflow in its initial traveling direction and forces the airflow to turn and reorganize. In addition, the impact between the first airflow and the first impingement surface 353 aids a transfer of energy from the first airflow to the impingement portion 361 and thus the die tip 114. For example, the first and the second airflows may enter the meltblown system at a high temperature for maintaining the liquidity state of the polymer flow. The impingement portion 361 and the first and the second impingement surfaces 353 and 355 provide a mechanism for efficient heat transfer and regulating the uniformity of the first and the second airflows.

The first air plate 116 is positioned at least partially adjacent the first angled side 362 of the elongated die tip 114. The first air plate 116 is configured to form a first air exit passageway 382. The first air exit passageway 382 is configured to receive the first airflow dispensed from the first airflow regulation channel 352 of the elongated die tip 114. The first air exit passageway dispenses the first airflow adjacent the tip opening 374 of the polymer flow tip 372. The at least a portion of the polymer flow is at least partially entrained with such first airflow due to the high speeds of the first airflow. In some embodiments, the first airflow may exit the tip opening 374 at about up to 0.8 times of the speed of sound in air. In other embodiments, this speed may be in a range that includes up to 0.8 times the speed of sound in air.

In the embodiments illustrated in FIGS. 3A-3J, the second air plate 118 is placed symmetrical to the first air plate 116 about the die tip 114. That is, the second air plate 118 is positioned at least partially adjacent the second angled side 364 of the die tip 114, which is elongated in certain implementations. The second air plate 118 is configured to form a second air exit passageway 383 that is configured to receive the second airflow dispensed from the second airflow regulation channel 354 of the elongated die tip 114. The second air exit passageway 383 dispenses the second airflow adjacent the tip opening 374 of the polymer flow tip 372 and the at least a portion of the polymer flow to at least partially entrain such second airflow with the polymer flow.

In the embodiments shown in FIGS. 3A-3J, and specifically in the embodiments shown in FIGS. 3D, 3E, 3I, and 3J, the body portion 360 includes an impingement portion 361 housing the first airflow regulation channel 352 and the second airflow regulation channel 354. The impingement portion 361 provides a base for making the plurality of threaded holes 205 that may be used for assembly with the first and the second air plates 116 and 118. In some embodiments, when the first and the second air plates 116 and 118 are assembled with the die tip 114 using fasteners engaging the plurality of threaded holes 205, the impingement portion 361 is sealingly coupled with the first and the second air plates 116 and 118 such that the airflow exiting the first and the second air flow passageways 340 and 342 of the mounting structure 112 are directed to enter the first and the second airflow regulation channels 352 and 354.

In some embodiments, such as in FIGS. 3A and 3F, the air plates 116 and 118 may be directly fastened to the mounting structure 112 using fasteners 395 through holes 392 at the receiving holes 394. In some embodiments, the elongated die tip 114 is not directly fastened onto the mounting structure 112 but relies on the air plates 116 and 118 for sealingly attach to the mounting structure 112. In some embodiments, the fastener arrangements of FIGS. 3A, 3D, and/or 3E may be combined with modification to make use of both or all features contained therein.

In one embodiment, the first airflow passageway 340 of the mounting structure 112 is not aligned with the first airflow regulation channel 352 such that the impingement portion 361 of the body portion 360 can decelerate and re-organize or reassemble the airflow before it is fed into the first airflow regulation channel 352. Such regulation effect resets the airflow dynamics so that the airflow dynamics in the first airflow regulation channel 352 is at least partially independent from the airflow dynamic of the first airflow passageway 340.

Similarly, the second airflow passageway 342 of the mounting structure 112 is not fully aligned with the second airflow regulation channel 354 such that the impingement portion 361 of the body portion 360 can decelerate and re-organize the airflow before it is fed into the second airflow regulation channel 354. This arrangement resets the airflow dynamics so that the airflow dynamics in the second airflow regulation channel 354 is different from the airflow dynamic of the second airflow passageway 342.

In addition, the body portion 360 of the die tip 114 includes a neck portion 365 that is narrower than the impingement portion 361. The neck portion 365 obstructs airflows exiting the first airflow regulation channel 352 and the second airflow regulation channel 354 using a transition surface 363 (e.g., a second impingement surface) extending from either side of the neck portion 365 to the first or the second angled side 362 and 364. As such, the neck portion 365 reduces a width of the body portion 360 such that a transition surface 363 extending from the neck portion 365 to the first angled side 362 impedes the first airflow exiting the first airflow regulation channel 352. The transition surface 363 thus can function as a second level impingement surface and regulates and reassemble the first or second airflow in similar manners as the impingement surfaces 353 and 355. The first angled side 362 is adjacent to a first air plate 116 for directing and accelerating the first airflow impeded by the transition surface 363.

The first airflow regulation channel 352 is configured to receive the first airflow from the first air passageway 340 of the mounting structure 112. The first airflow regulation channel 352 and the neck portion 365 regulate the first airflow and dispense the first airflow adjacent the first angled side 362 after deceleration and acceleration around the neck portion 361 and the transition surface 363, as described above. For example, in the embodiments illustrated in FIGS. 3B-3E, and 3G-3J, the neck portion 365 and the transition surface 363 provides another impingement location and mechanism for efficient heat transfer and disrupting the flowing-by airflows for improving subsequent flow uniformity.

The second airflow regulation channel 354 is also configured to receive the second airflow from the second air passageway 342 of the mounting structure 112. The second airflow regulation channel 354 and the neck portion 365 regulate the second airflow and dispense the second airflow adjacent the second angled side after deceleration and acceleration around the neck portion 361. The neck portion 365 effectively avoids, removes, or reduces formation of eddy flow in later development around the first and the second angled sides 362 and 364, thus achieving a more uniform and higher speed airflow. Both the neck portion 365 and the impingement portion 361 enable the body portion 360 to avoid, in certain implementations, from having any fastener interfering with the first or the second airflow from the first and second airflow passageways 340 and 342 to the tip opening 374.

Turning to specific features of each embodiment, FIG. 3A (3F) illustrates an embodiment that does not include the neck portion 365 as illustrated in FIGS. 3B (3G), 3D (3I), and 3E (3J). In other embodiments, however, FIG. 3A may also include a structure similar to the neck portion 365 as shown in FIG. 3B (3G), for example, having a narrowed portion regulating airflows either in the die tip 114 or in the mounting structure 112. FIG. 3C (3H) illustrates an embodiment where the mounting structure 112 is integral with the meltblown beam 120 and thus not a separate component of the meltblown system 100 as illustrated.

FIGS. 3D (3I) and 3E (3J) illustrate the replacement cartridge 110 that may include the mounting structure 112 and the die tip 114, as well as the first and the second air plates 116 and 118. In other embodiments, however, the mounting structure 112 and the die tip 114 may be manufactured as the same piece. The first and the second air plates 116 and 118 are then assembled onto the die tip 114. In other embodiments, however, FIGS. 3D (3I) and 3E (3J) differs in that the connection location (e.g., where fasteners are provided) between the air plates 116 and 118 and the die tip 114 may be at different locations, as the threaded holes 205 are provided at different locations. Other implementations are possible, such as combining or mixing two or more features presented in FIGS. 3A through 3J.

In the embodiment shown in FIGS. 3E and 3J, the first air plate 116 and the second air plate 118 are mounted onto the mounting structure 112 using a plurality of fasteners 390 perpendicular to the vertical direction of the polymer flow chamber 330, at the threaded holes 205. Although the fasteners 390 are illustrated in such specific orientation, in other implementations, the fasteners 390 may be vertical or diagonal depending on access constraints. Yet still, the first airflow and the second airflow are not impeded by or in contact with any fastener or other undesired obstructions when the first airflow travels from the first airflow regulation channel 352 to reach the polymer flow die tip 372, and the second airflow travels from the second airflow regulation channel 354 to reach the polymer flow die tip 372. In some embodiments, the elongated die tip has an overall width into the page between about 0.5-1.0 meter to about 5.5 meters. For example, the polymer flow tip 372 can be repeated at about 25 to 100 polymer flow tips per inch (or about 1-4 polymer flow tips per mm) along the overall width. The polymer flow tip 372 has a diameter of about 0.05 mm to about 1.00 mm.

In operation, the first airflow and the second airflow may be accelerated, for example, to up to about 0.7 to about 0.8 Mach speed and heated to about 100 to about 375 degrees Celsius for fiberizing polymer fluids at the tip opening of the elongated die tip. The second airflow is accelerated to a substantially same level of speeds as the first airflow when reached at the polymer flow tip 372 such that both the first airflow and the second airflow are entrained to draw and blow out the polymer from the polymer flow tip 372. In some embodiments, the first airflow and the second airflow are entrained at a sharp or desired angle of about 50 degrees. In other embodiments, the first airflow and the second airflow are entrained at an angle greater than 50 degrees and less than 90 degrees. Correspondingly, the outer surfaces of the first and the second air plates 116 and 118 can form an angle of about 100 degrees to about 160 degrees.

The embodiments illustrated in FIGS. 3A through 3J can produce entrained airflows of the first airflow and the second airflow at very high uniformity. Turning temporarily to FIG. 10, which shows measurements of air uniformity across the width of the die tip assembly 110. The horizontal axis 1000 shows the width location (in millimeters as measured starting from one end) of the die tip assembly 110. The vertical axis 1100 represents the output velocity measured at about 12 mm (or 0.5″) below the airflow entrainment point (e.g., entrainment point 430 of FIG. 4A), measured in feet per minute (FPM). The grouped measurements 1010, 1020, 1030, and 1040 respectively represent the output percentage 25%, 50%, 75%, and 98% of the air compressor or air output. Three sets of measurements 1040 are provided for the output at 98% to account for measurement variations or errors. As the measurement shows, the output velocity are consistent across the width of the die tip assembly 110. Slightly reduced output velocity may be observed at the two ends of the die tip assembly 110 when the compressor output is at 98%, yet the variations are still within 2.5% of the average output velocity. Such uniform performance will in turn improve the uniformity of the drawn polymer flow and its fiberization.

Turning now to FIG. 3K, the detailed cross sectional view illustrates the first airflow 301 and the second airflow 303 in the embodiment of the replacement cartridge shown in FIG. 3I. Other embodiments of FIGS. 3F, 3G, 3H, and 3J share similar illustrated flow patterns as does that of FIG. 3K. When the first airflow 301 enters the first air passageway 340, the first airflow 301 is not uniform and may exhibit different velocities and/or different pressures in the first air passageway 340. A method of improving the uniformity of the airflows 301 and 303 is discussed here. As the pressurized air is fed into one or more air passageways (e.g., 340 and 342) in the mounting structure 112, the air travels at a high velocity. The moving air is impinged by the impingement surface 353 near the exit of the first air passageway 340. The obstruction provided by the impingement surface 353 forces the first airflow 301 to redistribute and reassemble within a first plenum 341 above the impingement surface 353. In the first plenum 341, the airflow 301 becomes a redistributed or reassembled airflow 302. Although the first plenum 341 is illustrated to be within the mounting structure 112, the first plenum 341 may be extended into spaces occupied by the die tip 114 in other embodiments.

The reassembled first airflow 302 the travels into the air regulation channel 352 of the die tip 114 and enters a second volume or plenum 345 created between the neck portion 365 and the first air plate 116. Similarly, the second airflow 303 enters the second air passageway 342 and is reassembled in a first plenum 343 to become a reassembled airflow 304, which enters the second air regulation channel 354 and then reassembled again in a second plenum 346 created between the neck portion 365 and the second airplate 118. The second plenums 345 and 346 have a lower bound provided by the transition (second impingement) surface 363, which further disrupts and causing the airflows 301 and 303 to reassemble once more. As such, the uniformity of the airflows 301 and 303 is improved. The airflows 301 and 303 then enters and passes through a set of exit holes 369 and enters the air exit passage ways 382 and 383 respectively. The airflows 301 and 303 are accelerated in the air exit passage ways 382 and 383 to draw the polymer provided in the polymer flow tip 372 for melt blowing.

In some embodiments, the exit holes 369 below the transition surfaces 363 may be replaced with an equivalent structure, such as a gap (not illustrated) between the wide portion 375 that is under the neck portion 365 and either of the air plates 116 and 118. The gap may have a consistent width along the width (in the cross direction) of the die tip 114. Such configuration may avoid minor machining inconsistencies of the multiple exit holes 369 along the width of the die tip 114.

FIGS. 4A-4D are local cross sectional views of specific features of an embodiment of the die tip 114. Referring first to FIG. 4A, geometric relationships between the die tip 114 and the first and the second air plates 116 and 118 are illustrated. The first and the second air plates 116 and 118 form a pointy angle 410 between their respective outer surfaces. The die tip 114 has a pointy or external angle 420. In some embodiments, the pointy angle 410 ranges between 90 degrees and 140 degrees. In other embodiments, the pointy angle 420 ranges between 50 degrees and 90 degrees. The elongated die tip 114 includes an angled tip 412, such as the polymer flow tip 372 of FIG. 3A. The first air plate 116 includes a first tip 402.

The second air plate 118 includes a second tip 409. The distance between the first tip 402 and the second tip 409 is defined as the tip-to-tip distance 404. The vertical distance between the angled tip 412 and both the first and the second tips 402 and 409 is defined as a set-back dimension 440. In some embodiments, the setback dimension 440 is between about 0.5 mm and 4.0 mm. In some embodiments, the ratio between the setback dimension 440 and the tip-to-tip distance 404 is a design parameter for achieving good meltblown performance. For example, the ratio of the setback dimension and the tip-to-tip distance is about 0.25 to 2.5.

FIG. 4A further shows an illustrative entrainment point 430. The entrainment point 430 represents a location for the first airflow and the second airflow meet at high speeds and create a low pressure point, drawing out the polymer flow from the elongated die tip 114 as well as drawing in surrounding air. The entrainment point 430 may be considered as a tip apex for the first airflow and the second flow to be entrained such that no interfering structure is presented with, in one embodiment, at least about 38 mm away from the tip apex. For example, the distance between the entrainment point 430 and the exit opening of the first or the second air regulation channels 340 and 342 is no less than 38 mm in certain implementations, and that the outside space of the first and the second air plates 116 and 118 does not include any obstruction. Such configuration improves the die tip 114's ability in improving fiber size in the polymer flow output as well as improves the uniformity of the entrained airflow.

FIGS. 4B-4D shows embodiments of a rib structure 450 supporting the inner cavity of the die tip 114. The polymer flow chamber 364 of the elongated die tip 114 has a first side wall 432 and a second side wall 434 opposing the first side wall 432. The rib 450 connects the first side wall 432 to the second side wall 434. The rib 450 has a cross sectional fluid dynamic shape to promote laminar flow in the polymer flow, in the polymer flow chamber 364 of the elongated die tip 114. FIGS. 4C and 4D provides two different embodiments of the rib 450.

FIG. 5 is a local cross-sectional front view of an embodiment of the polymer flow tip 372 of the die tip 114 of FIGS. 3 and 4. In the illustrated embodiment, the polymer flow tip 372 has an internal angle 510 of about thirty degrees in one embodiment. The tip opening 572 has a diameter, in one embodiment, of about 0.3 millimeters, but such may vary as desired. The polymer flow tip 372 includes a transitional radius 520 for defining a rounded transition near the tip opening 572. In the illustrated embodiment, the transitional radius 520 is about 1.2 mm. In other implementations, the transitional radius 520 may be provided from about 0.5 mm to about 2.5 mm. In some embodiments, the internal angle 510 may change according to variation of the pointiness of the polymer flow tip 372. For example, when the polymer flow tip 372 has a greater angle, the internal angle 510 may be greater accordingly.

FIG. 6 is another local front view of an embodiment of the polymer flow tip of the die tip 114. In this view, it shows that the inner surface 694 of the first air plate 116 and the inner surface 690 of the second air plate 118 are planar and approximately parallel to the angled surfaces 362 and 364 of the elongated die tip 114. In other implementations, such surfaces may not be parallel. The inner surfaces 694 and 690 are respectively distanced away from the angled surfaces 362 and 364 by a width “W.” There is a clearance distance “L” from the polymer flow tip 372 of the die tip 114 to the base of the die tip 114. In some embodiments, the clearance distance is at least 38 mm long and no other obstacles will intrude the space within that length. In some embodiments, the ratio between W and L may be set at a desired range, such as about 10 to about 40. In other embodiments, The width W may vary along the length of L, such as, for example, according to certain profile for accelerating the speeds of the first and the second airflows.

FIG. 7 includes a partial top view and a partial cross-sectional side view of the breaker plates 210 used in the die tip assembly of FIG. 2. The breaker plate 210 governs (e.g., unifies, filters, and/or slows) polymer flow from the polymer flow passageway 330 of the mounting structure 112 into the polymer flow chamber 350 of the die tip 114. The breaker plate 210 includes a plurality of holes 710. The holes 710 may be arranged in various manners, such as staggered or in an array as shown. In certain implementations, the holes 710 may be cylindrical; in other instances, the holes 710 may be tapered or shaped to achieve polymer distribution and filter screen support. The plurality of cylindrical holes 710 limits the direction of the polymer flow to travel.

FIG. 9 is an illustrative front view of an implementation of the meltblown system 100 showing space requirements. The meltblown beam 120, the mounting structure 112, and the die tip 114 form a height 902 such that no other obstacle interferes with the surrounding air of the die tip 114 in a region of control 910. The region of control 910 may be defined with an angle (θ) determined by the height above the die tip 114 and an offset distance 904. In some implementations, the region of control 910 may be no greater than 45 degrees. In some embodiments, the region of control 910 may be no greater than 30 degrees. The height 902 may be about 8 inches to about 30 inches. The offset distance 904 may be determined by the height above the die tip 114 and tan (θ). In some implementations, the offset distance 904 is about 0-12 inches. Such clearance requirement avoids potential negative airflow effect to the surrounding air around the entrainment point 430 shown in FIG. 4A.

Other implementations are possible. For example, although the meltblown process is commonly used for thermoplastic materials for producing non-woven fabric products, different polymers other than thermoplastic materials may be used with the disclosed equipment. For example, curable materials in their liquid form may be delivered onto a target substrate using the same apparatus or apparatus modified using the same working principles. In other instances, although the mounting structure 112 and the die tip 114 are illustrated as two separate structures, in other embodiments, they can be one integral structure to save additional sealing steps when the die tip 114 is fitted against the mounting structure 112. In some other embodiments, the die tip 114 and the first and the second air plates 116 and 118 may be fitted directly to the meltblown beam 120 without the intermediate mounting structure 112.

Claims

1. A meltblown die tip assembly comprising: a mounting structure having at least one polymer flow passageway formed therein and configured to receive a polymer flow, a first air passageway formed therein and configured to receive a first airflow, and a second air passageway formed therein and configured to receive a second airflow;an elongated die tip having a polymer flow chamber with a first opening and a second opening, a polymer flow tip, a first airflow regulation channel having a first transition surface provided as a part of the elongated die tip, a second airflow regulation channel having a second transition surface provided as a part of the elongated die tip, a first angled side, and a second angled side,wherein the first transition surface extends at least partially across a portion of the first airflow regulation channel,wherein the second transition surface extends at least partially across a portion of the second airflow regulation channel,wherein the polymer flow chamber of the elongated die tip is in fluid communication with the at least one polymer flow passageway of the mounting structure at the first opening of the polymer flow chamber of the elongated die tip, and the polymer flow chamber configured to receive at least a portion of the polymer flow from the at least one polymer flow passageway of the mounting structure, the polymer flow chamber of the elongated die tip in fluid communication with the polymer flow tip at the second opening,wherein the polymer flow tip of the elongated die tip is configured to receive at least a portion of the polymer flow from the polymer flow chamber at the second opening, the polymer flow tip having a tip opening configured to dispense at least a portion of the polymer flow,wherein the first airflow regulation channel of the elongated die tip is configured to receive the first airflow from the first air passageway of the mounting structure, regulate the first airflow using at least the first transition surface provided as a part of the elongated die tip, and dispense the first airflow adjacent the first angled side of the elongated die tip,wherein the second airflow regulation channel of the elongated die tip is configured to receive the second airflow from the second air passageway of the mounting structure, regulate the second airflow using at least the second transition surface provided as a part of the elongated die tip, and dispense the second airflow adjacent the second angled side of the elongated die tip;a first air plate positioned at least partially adjacent the first angled side of the elongated die tip to form a first air exit passageway to receive the first airflow dispensed from the first airflow regulation channel of the elongated die tip and to dispense the first airflow adjacent the tip opening of the polymer flow tip and the at least a portion of the polymer flow; anda second air plate positioned at least partially adjacent the second angled side of the elongated die tip to form a second air exit passageway to receive the second airflow dispensed from the second airflow regulation channel of the elongated die tip and to dispense the second airflow adjacent the tip opening of the polymer flow tip and the at least a portion of the polymer flow;wherein the first airflow and the second airflow assist with the polymer flow at the polymer flow tip,wherein the first airflow regulation channel comprises a plurality of transition surfaces provided as a part of the elongated die tip, andwherein at least one or more of the plurality of transition surfaces provided as a part of the elongated die tip extends the entire width of the first airflow regulation channel in one or more locations.
2. The meltblown die tip assembly of claim 1, wherein the elongated die tip includes an impingement portion housing the first airflow regulation channel and the second airflow regulation channel.
3. The meltblown die tip assembly of claim 2, wherein the elongated die tip includes a neck portion narrower than the impingement portion and obstructing airflows of the first airflow regulation channel and the second airflow regulation channel.
4. The meltblown die tip assembly of claim 2, wherein the impingement portion includes a plurality of fastenable holes for receiving fasteners affixing the first air plate and the second air plate to the impingement portion of the elongated die tip.
5. The meltblown die tip assembly of claim 4, wherein the elongated die tip is not threadedly connected to the mounting structure.
6. The meltblown die tip assembly of claim 1, wherein the elongated die tip and the first and the second air plates form a replaceable cartridge.
7. The meltblown die tip assembly of claim 1, further comprising at least one breaker plate governing polymer flow from the polymer flow passageway of the mounting structure into the polymer flow chamber.
8. The meltblown die tip assembly of claim 7, wherein the at least one breaker plate includes a plurality of holes for filtering and regulating the polymer flow.
9. The meltblown die tip assembly of claim 8, wherein the at least one breaker plate includes two stacked breaker plates having one or more screen filter positioned between the two stacked breaker plates.
10. The meltblown die tip assembly of claim 1, wherein the first air plate and the second air plate are mounted to the mounting structure using a plurality of fasteners parallel to a vertical axis of the polymer flow chamber.
11. The meltblown die tip assembly of claim 1, wherein the first airflow regulation channel is configured to receive the first airflow from the first air passageway of the mounting structure, regulate the first airflow, transfer heat from the first airflow to the elongated die tip, and dispense the first airflow adjacent the first angled side of the elongated die tip; and wherein the second airflow regulation channel is configured to receive the second airflow from the second air passageway of the mounting structure, regulate the second airflow, transfer heat from the second airflow to the elongated die tip, and dispense the second airflow adjacent the second angled side of the elongated die tip.
12. The meltblown die tip assembly of claim 11, wherein the first and the second airflows cause the die tip assembly to operate at a temperature range that maintains the polymer flow in a liquid state.
13. The meltblown die tip assembly of claim 1, wherein the polymer flow tip has an external angle of about 50 degrees to about 90 degrees.
14. The meltblown die tip assembly of claim 1, wherein the mounting structure and the elongated die tip are a unified piece.
15. The meltblown die tip assembly of claim 1, wherein the elongated die tip further comprises an angled tip, the first air plate further comprises a first tip, and the second air plate further comprises a second tip, such that a vertical distance between the angled tip and a midpoint of the first tip and the second tip defines a setback dimension being about 0.5 mm to about 4.0 mm.
16. The meltblown die tip assembly of claim 15, wherein a distance between the first tip and the second tip defines a tip-to-tip distance, such that a ratio of the setback dimension and the tip-to-tip distance is about 0.25 to about 2.5.
17. The meltblown die tip assembly of claim 1, wherein the at least one polymer flow passageway of the mounting structure includes an opening width near the first opening of the polymer flow chamber allowing access to internal surfaces of the at least one polymer flow passageway of the mounting structure.
18. The meltblown die tip assembly of claim 17, wherein the internal surfaces of the at least one polymer flow passageway of the mounting structure includes a tapered top surface for distributing the polymer flow.
19. The meltblown die tip assembly of claim 1, wherein the first air plate includes a first outer surface, the second air plate includes a second outer surface, wherein the first outer surface and the second outer surface form an angle between about 90 and about 180 degrees.
20. The meltblown die tip assembly of claim 19, wherein the first air plate includes a first outer surface, the second air plate includes a second outer surface, wherein the first outer surface and the second outer surface form an angle between about 90 and about 140 degrees.
21. The meltblown die tip assembly of claim 1, further comprising a meltblown beam fluidly connected with the mounting structure for supplying air and polymer, wherein the meltblown beam and the mounting structure form a height above the die tip such that no other obstacle interferes with the surrounding air of the die tip in a region of control defined by an angle determined by the height above the die dip and an offset distance.
22. The meltblown die tip assembly of claim 21, wherein the meltblown beam and the mounting structure are one unified piece.
23. The meltblown die tip assembly of claim 1, wherein the first airflow and the second airflow are entrained at a tip apex drawing the polymer flow and surrounding air such that no interfering structure is present within at least about 38 mm of the tip apex.
24. The meltblown die tip assembly of claim 1, wherein the polymer flow chamber of the elongated die tip includes a rib structure connecting a first side wall of the polymer flow chamber to a second, opposing, side wall of the polymer flow chamber, wherein the rib structure has a cross sectional fluid dynamic shape to promote laminar flow in the polymer flow.
25. The meltblown die tip assembly of claim 1, wherein the first transition surface provided as a part of the elongated die tip is located at or adjacent to a top surface of the elongated die tip.
26. The meltblown die tip assembly of claim 1, wherein the first transition surface provided as a part of the elongated die tip is located within the first airflow regulation channel.
27. The meltblown die tip assembly of claim 1, wherein the elongated die tip has an overall width between 1.0 to 5.5 meters and the polymer flow tip is repeated at about 25 to 100 polymer flow tips per inch along the overall width.
28. The meltblown die tip assembly of claim 27, wherein the polymer flow tip has a diameter of about 0.05 mm to about 1.00 mm.
29. The meltblown die tip assembly of claim 27, wherein the first airflow and the second airflow converge to produce an output airflow spanning the overall width of the elongated die tip, wherein the output airflow has a uniformity level such that a flow rate near an end of the elongated tip is greater than or equal to 97.5% of an average flow rate of the output airflow.
30. The meltblown die tip assembly of claim 1, wherein the second airflow regulation channel further comprises a pluarlity of transition surfaces provided as a part of the elongated die tip.
31. The meltblown die tip assembly of claim 30, wherein at least one of the plurality of transition surfaces provided as a part of the elongated die tip extends the entire width of the second airflow regulation channel in a plurality of locations.
32. The meltblown die tip assembly of claim 1, wherein the first transition surface and the second transition surface are each substantially flat.
33. The meltblown die tip assembly of claim 1, wherein the first transition surface provided as a part of the elongated die tip is located between a top surface of the elongated die tip and the first air exit passageway.
34. An elongated die tip comprising: a body portion, a polymer flow chamber, a polymer flow tip, a first airflow regulation channel, a first angled side, a second airflow regulation channel, and a second angled side opposed to the first angled side, the first angled side and the second angled side positioned adjacent the polymer flow tip,wherein the polymer flow chamber is configured to receive a polymer flow and to deliver the polymer flow to the polymer flow tip,wherein the first airflow regulation channel of the elongated die tip is configured to receive a first airflow, regulate the first air flow, and to deliver the first airflow adjacent the first angled side;wherein the body portion includes at least a portion of the first airflow regulation channel with at least one transition surface provided as a part of the elongated die tip, the at least one transition surface is configured to impinge the first airflow to regulate the first airflow;wherein the at least one transition surface extends at least partially across the first airflow regulation channel; andwherein the first angled side is positioned adjacent the polymer flow tip such that the first airflow draws out the polymer flow from the polymer flow tip, andwherein the body portion includes a narrow neck portion such that a second transition surface from the neck portion impedes the first airflow exiting the first airflow regulation channel to the first angled side.
35. An elongated die tip comprising: a body portion, a polymer flow chamber, a polymer flow tip, a first airflow regulation channel, a first angled side, a second airflow regulation channel, and a second angled side opposed to the first angled side, the first angled side and the second angled side positioned adjacent the polymer flow tip,wherein the polymer flow chamber is configured to receive a polymer flow and to deliver the polymer flow to the polymer flow tip,wherein the first airflow regulation channel of the elongated die tip is configured to receive a first airflow, regulate the first air flow, and to deliver the first airflow adjacent the first angled side;wherein the body portion includes at least a portion of the first airflow regulation channel with at least one transition surface provided as a part of the elongated die tip, the at least one transition surface is configured to impinge the first airflow to regulate the first airflow;wherein the at least one transition surface extends at least partially across the first airflow regulation channel, andwherein the first angled side is positioned adjacent the polymer flow tip such that the first airflow draws out the polymer flow from the polymer flow tip,wherein the first angled side of the elongated die tip is adjacent a first air plate for directing and accelerating the first airflow impeded by the at least one transition surface.
36. The elongated die tip of claim 35, wherein the first airflow heats up the body portion when the at least one transition surface impinges the airflow to assist with heat transfer from the first and second air flows to the elongated die tip.
37. The elongated die tip of claim 35, wherein the second airflow regulation channel receives a second airflow and provides the second airflow adjacent the second angled side.
38. The elongated die tip of claim 37, wherein the body portion includes a second transition surface impinging the second airflow for regulating the second airflow in the second air regulation channel.
39. The elongated die tip of claim 38, wherein the second airflow is accelerated to a substantially same level of speeds as the first airflow when reached at the polymer flow tip such that both the first airflow and the second airflow are entrained to draw and blow out the polymer from the polymer flow tip.
40. The elongated die tip of claim 39, wherein the first airflow and the second airflow are not impeded by or in contact with any fastener when the first airflow travels from the first airflow regulation channel to reach the polymer flow tip and the second airflow travels from the second airflow regulation channel to reach the polymer flow tip.
41. The elongated die tip of claim 40, wherein the first airflow and the second airflow are not impeded for at least 38 mm away from the polymer flow tip.
42. The elongated die tip of claim 40, wherein the first air plate further includes a first tip, and the second air plate further includes a second tip, such that a vertical distance between the polymer flow tip and a midpoint of the first tip and the second tip defines a setback dimension being about 0.5 mm to 4.0 mm.
43. The elongated die tip of claim 42, wherein a distance between the first tip and the second tip defines a tip-to-tip distance, such that a ratio of the setback dimension and the tip-to-tip distance is about 0.25 to 2.5.
44. The elongated die tip of claim 35, wherein the elongated die tip provides threadedly connection to a first air plate and a second air plate.
45. A meltblown die tip assembly comprising: a mounting structure having a polymer flow conduit and an airflow conduit;a die tip sealingly attached to the mounting structure, the die tip receiving a polymer flow from the polymer flow conduit of the mounting structure, and receiving an airflow from the airflow conduit of the mounting structure, wherein the die tip includes a first transition surface provided as a part of an airflow channel of the die tip for receiving and reflecting the airflow to force the airflow to reassemble, a narrow neck portion such that a second transition surface from the neck portion impedes the first airflow exiting the first airflow regulation channel to the first angled side, and a polymer flow tip for providing the polymer from the meltblown die tip assembly;wherein the first transition surface and the second transition surface extends at least partially across the airflow conduit; andan air plate attached to the mounting structure positioned beside the die tip to form an airflow passage to provide the airflow exiting the meltblown die tip assembly adjacent the polymer flow tip, wherein the airflow draws the polymer flow from the polymer flow tip and fiberizes at least a portion of the polymer flow.

CROSS REFERENCE AND PRIORITY CLAIM TO PROVISIONAL APPLICATION

This application claims the benefits and priority of the U.S. Provisional Patent Application No. 62/590,037 filed on Nov. 22, 2017, the entire contents of which are incorporated herein by reference for all purposes.

US Referenced Citations (385)

Number	Name	Date	Kind
3016599	Perry, Jr.	Jan 1962	A
3268954	Joa	Aug 1966	A
3338992	Kinney	Aug 1967	A
3341394	Kinney	Sep 1967	A
3379811	Hartmann et al.	Apr 1968	A
3502763	Hartmann	Mar 1970	A
3538551	Joa	Nov 1970	A
3542615	Dobo et al.	Nov 1970	A
3606175	Appel et al.	Sep 1971	A
3617439	Chapman, Jr.	Nov 1971	A
3637146	Banks	Jan 1972	A
3673021	Joa	Jun 1972	A
3692618	Oskar et al.	Sep 1972	A
3692622	Dunning	Sep 1972	A
3704198	Prentice	Nov 1972	A
3755527	Keller et al.	Aug 1973	A
3764451	Dunning	Oct 1973	A
3768118	Ruffo et al.	Oct 1973	A
3793678	Appel	Feb 1974	A
3802817	Matsuki et al.	Apr 1974	A
3825379	Lohkamp et al.	Jul 1974	A
3825380	Harding et al.	Jul 1974	A
3825381	Dunning et al.	Jul 1974	A
3837988	Hennen et al.	Sep 1974	A
3849241	Butin et al.	Nov 1974	A
3865535	Langdon et al.	Feb 1975	A
3895089	Goyal	Jul 1975	A
3936262	Hehl	Feb 1976	A
3949035	Dunning et al.	Apr 1976	A
3954361	Page	May 1976	A
3959421	Weber et al.	May 1976	A
3966126	Werner	Jun 1976	A
3970417	Page	Jul 1976	A
3971373	Braun	Jul 1976	A
3976734	Dunning et al.	Aug 1976	A
3978185	Buntin et al.	Aug 1976	A
3981650	Page	Sep 1976	A
4041203	Brock et al.	Aug 1977	A
4100324	Anderson	Jul 1978	A
4118531	Hauser	Oct 1978	A
4241881	Laumer	Dec 1980	A
4315347	Austin et al.	Feb 1982	A
4340563	Appel et al.	Jul 1982	A
4375448	Appel et al.	Mar 1983	A
4380570	Schwarz	Apr 1983	A
4426417	Meitner et al.	Jan 1984	A
4436780	Hotchkiss et al.	Mar 1984	A
4486161	Middleton	Dec 1984	A
4526733	Lau	Jul 1985	A
4528239	Trokhan	Jul 1985	A
4588635	Donovan	May 1986	A
4622259	McAmish et al.	Nov 1986	A
4623576	Lloyd et al.	Nov 1986	A
4650127	Radwanski et al.	Mar 1987	A
4650481	O'Connor et al.	Mar 1987	A
4655757	McFarland et al.	Apr 1987	A
4659609	Lamers et al.	Apr 1987	A
4663220	Wisneski et al.	May 1987	A
4666621	Clark et al.	May 1987	A
4714647	Shipp et al.	Dec 1987	A
4720252	Appel et al.	Jan 1988	A
4724114	MacFarland	Feb 1988	A
4741941	Englebert et al.	May 1988	A
4767586	Radwanski et al.	Aug 1988	A
4784892	Storey et al.	Nov 1988	A
4786550	McFarland et al.	Nov 1988	A
4789592	Taniguchi et al.	Dec 1988	A
4795668	Krueger et al.	Jan 1989	A
4803117	Daponte	Feb 1989	A
4818463	Buehning	Apr 1989	A
4818464	Lau	Apr 1989	A
4820572	Killian et al.	Apr 1989	A
4826415	Mende	May 1989	A
4859388	Peterson et al.	Aug 1989	A
4889476	Buehning	Dec 1989	A
4906513	Kebbell et al.	Mar 1990	A
4923454	Seymour et al.	May 1990	A
4986743	Buehning	Jan 1991	A
4988560	Meyer et al.	Jan 1991	A
5043207	Donovan et al.	Aug 1991	A
5057368	Largman et al.	Oct 1991	A
5069970	Largman et al.	Dec 1991	A
5080569	Gubernick et al.	Jan 1992	A
5087186	Buehning	Feb 1992	A
5098636	Balk	Mar 1992	A
5108820	Kaneko et al.	Apr 1992	A
5128082	Makoui	Jul 1992	A
5145689	Allen et al.	Sep 1992	A
5160746	Dodge et al.	Nov 1992	A
5162074	Hills	Nov 1992	A
5195684	Radzins	Mar 1993	A
5196207	Koenig	Mar 1993	A
5236641	Allen et al.	Aug 1993	A
5248247	Rubhausen et al.	Sep 1993	A
5253815	Bowns et al.	Oct 1993	A
5268106	Allen et al.	Dec 1993	A
5269670	Allen et al.	Dec 1993	A
5273565	Milligan et al.	Dec 1993	A
5277976	Hogle et al.	Jan 1994	A
5298694	Thompson et al.	Mar 1994	A
5336552	Strack et al.	Aug 1994	A
5344297	Hills	Sep 1994	A
5350370	Jackson et al.	Sep 1994	A
5350624	Georger et al.	Sep 1994	A
5382400	Pike et al.	Jan 1995	A
5421921	Gill et al.	Jun 1995	A
5421941	Allen et al.	Jun 1995	A
5423935	Benecke et al.	Jun 1995	A
5435708	Kaun	Jul 1995	A
5445509	Allen et al.	Aug 1995	A
5446100	Durrance et al.	Aug 1995	A
5458291	Brusko et al.	Oct 1995	A
5466410	Hills	Nov 1995	A
5476616	Schwarz	Dec 1995	A
5492751	Butt et al.	Feb 1996	A
5498463	McDowall et al.	Mar 1996	A
5508102	Georger et al.	Apr 1996	A
5516476	Haggard et al.	May 1996	A
5527178	White et al.	Jun 1996	A
5539056	Yang et al.	Jul 1996	A
5540332	Kopacz et al.	Jul 1996	A
5580581	Buehning	Dec 1996	A
5595699	Wright et al.	Jan 1997	A
5596052	Resconi et al.	Jan 1997	A
5601851	Terakawa	Feb 1997	A
5605706	Allen et al.	Feb 1997	A
5605720	Allen et al.	Feb 1997	A
5607701	Allen et al.	Mar 1997	A
5618566	Allen et al.	Apr 1997	A
5620779	Levy et al.	Apr 1997	A
5628876	Ayers et al.	May 1997	A
5632938	Buehning, Sr.	May 1997	A
5635290	Stopper et al.	Jun 1997	A
5639541	Adam	Jun 1997	A
5652048	Haynes et al.	Jul 1997	A
5658639	Curro et al.	Aug 1997	A
5665278	Allen et al.	Sep 1997	A
5667635	Win et al.	Sep 1997	A
5667749	Lau et al.	Sep 1997	A
5679042	Varona	Oct 1997	A
5679379	Fabbricante et al.	Oct 1997	A
5698298	Jackson et al.	Dec 1997	A
5707468	Arnold et al.	Jan 1998	A
5711970	Lau et al.	Jan 1998	A
5720832	Minto et al.	Feb 1998	A
5725812	Choi	Mar 1998	A
5728219	Allen et al.	Mar 1998	A
5733581	Barboza et al.	Mar 1998	A
5744007	Trokhan et al.	Apr 1998	A
5772952	Allen et al.	Jun 1998	A
5773375	Swan et al.	Jun 1998	A
5807795	Lau et al.	Sep 1998	A
5811178	Adam et al.	Sep 1998	A
5814349	Geus et al.	Sep 1998	A
5834385	Blaney et al.	Nov 1998	A
5851562	Haggard et al.	Dec 1998	A
5858515	Stokes et al.	Jan 1999	A
5882573	Kwok et al.	Mar 1999	A
5888524	Cole	Mar 1999	A
5891482	Choi	Apr 1999	A
5902540	Kwok	May 1999	A
5904298	Kwok et al.	May 1999	A
5913329	Haynes et al.	Jun 1999	A
5916661	Benson et al.	Jun 1999	A
5932316	Cree et al.	Aug 1999	A
5935883	Pike	Aug 1999	A
5948710	Pomplun et al.	Sep 1999	A
5952251	Jackson et al.	Sep 1999	A
5964351	Zander	Oct 1999	A
5964742	McCormack et al.	Oct 1999	A
5974631	Leifeld	Nov 1999	A
5976427	Choi	Nov 1999	A
5993943	Bodaghi et al.	Nov 1999	A
6001303	Haynes et al.	Dec 1999	A
6018018	Samuelson et al.	Jan 2000	A
6028018	Amundson et al.	Feb 2000	A
6030331	Zander	Feb 2000	A
6074597	Kwok et al.	Jun 2000	A
6093665	Sayovitz et al.	Jul 2000	A
6117379	Haynes et al.	Sep 2000	A
6129801	Benson et al.	Oct 2000	A
6139308	Berrigan et al.	Oct 2000	A
6146580	Bontaites, Jr.	Nov 2000	A
6158614	Haines et al.	Dec 2000	A
6182732	Allen	Feb 2001	B1
6183670	Torobin et al.	Feb 2001	B1
6200669	Marmon et al.	Mar 2001	B1
6210141	Allen	Apr 2001	B1
6220843	Allen	Apr 2001	B1
6223398	Leifeld	May 2001	B1
6241503	Wright et al.	Jun 2001	B1
6269969	Huang et al.	Aug 2001	B1
6269970	Huang et al.	Aug 2001	B1
6273359	Newman et al.	Aug 2001	B1
6296463	Allen	Oct 2001	B1
6296936	Yahiaoui et al.	Oct 2001	B1
6315806	Torobin et al.	Nov 2001	B1
6319342	Riddell	Nov 2001	B1
6319865	Mikami	Nov 2001	B1
6336801	Fish et al.	Jan 2002	B1
6344102	Wagner	Feb 2002	B1
6364647	Sanborn	Apr 2002	B1
6378784	Allen et al.	Apr 2002	B1
6379770	Vair et al.	Apr 2002	B2
6417120	Mitchler et al.	Jul 2002	B1
6422428	Allen et al.	Jul 2002	B1
6422848	Allen et al.	Jul 2002	B1
6427745	Allen	Aug 2002	B1
6440437	Krzysik et al.	Aug 2002	B1
6454989	Neely et al.	Sep 2002	B1
6461133	Lake et al.	Oct 2002	B1
6471910	Haggard et al.	Oct 2002	B1
6474967	Haynes	Nov 2002	B1
6491507	Allen	Dec 2002	B1
6500563	Datta et al.	Dec 2002	B1
6502615	Allen	Jan 2003	B1
6524521	Kuroiwa et al.	Feb 2003	B1
6540831	Craine et al.	Apr 2003	B1
6565344	Bentley et al.	May 2003	B2
6572033	Pullagura et al.	Jun 2003	B1
6579084	Cook	Jun 2003	B1
6585838	Mullins et al.	Jul 2003	B1
6596205	Choi	Jul 2003	B1
6599985	Fujii et al.	Jul 2003	B2
6613268	Haynes et al.	Sep 2003	B2
6660129	Cabell et al.	Dec 2003	B1
6680265	Smith et al.	Jan 2004	B1
6739024	Wagner	May 2004	B1
6750166	Etzold et al.	Jun 2004	B1
6770156	Allen	Aug 2004	B2
6773648	Luo et al.	Aug 2004	B2
6773656	Kannari et al.	Aug 2004	B2
6784125	Yamakawa et al.	Aug 2004	B1
6796010	Noelle	Sep 2004	B2
6800226	Gerking	Oct 2004	B1
6803009	Morman et al.	Oct 2004	B2
6803013	Fish et al.	Oct 2004	B2
6811638	Close et al.	Nov 2004	B2
6824372	Berrigan et al.	Nov 2004	B2
6824733	Erickson et al.	Nov 2004	B2
6836937	Boscolo	Jan 2005	B1
6858057	Healey	Feb 2005	B2
6861025	Erickson et al.	Mar 2005	B2
6863960	Curro et al.	Mar 2005	B2
6867156	White et al.	Mar 2005	B1
6874203	Bauersachs	Apr 2005	B2
6918750	Geus et al.	Jul 2005	B2
6932590	Geus et al.	Aug 2005	B2
6946413	Lange et al.	Sep 2005	B2
6972104	Haynes	Dec 2005	B2
6989193	Haile et al.	Jan 2006	B2
6992159	Datta et al.	Jan 2006	B2
7004738	Becker et al.	Feb 2006	B2
7008207	Bansal et al.	Mar 2006	B2
7018188	James et al.	Mar 2006	B2
7056112	Ulcej	Jun 2006	B2
7081299	Richeson	Jul 2006	B2
7105609	Datta et al.	Sep 2006	B2
7150616	Haynes et al.	Dec 2006	B2
7160091	Baumeister	Jan 2007	B2
7168932	Lassig et al.	Jan 2007	B2
7176150	Kopacz et al.	Feb 2007	B2
7179412	Wilkie et al.	Feb 2007	B1
7192550	Berger et al.	Mar 2007	B2
7255759	Debyser et al.	Aug 2007	B2
7261936	Davis et al.	Aug 2007	B2
7285504	Jones et al.	Oct 2007	B2
7300530	Bouchette et al.	Nov 2007	B2
7316552	Haynes et al.	Jan 2008	B2
7320821	Prodoehl	Jan 2008	B2
7374416	Cook et al.	May 2008	B2
7438544	Glawion et al.	Oct 2008	B2
7455800	Ferencz et al.	Nov 2008	B2
7468335	Imes et al.	Dec 2008	B2
7501085	Bodaghi et al.	Mar 2009	B2
7504062	Locher et al.	Mar 2009	B2
7604770	Wedell et al.	Oct 2009	B2
7628941	Krause et al.	Dec 2009	B2
7732357	Annis et al.	Jun 2010	B2
7762800	Geus et al.	Jul 2010	B2
7837009	Gross et al.	Nov 2010	B2
7837814	Minami et al.	Nov 2010	B2
7989371	Angadjivand et al.	Aug 2011	B2
8012565	Luo	Sep 2011	B2
8017534	Harvey et al.	Sep 2011	B2
8029723	Angadjivand et al.	Oct 2011	B2
8088316	Muth et al.	Jan 2012	B2
8143177	Noda et al.	Mar 2012	B2
8231370	Maas et al.	Jul 2012	B2
8287677	Lake et al.	Oct 2012	B2
8357256	Dumas et al.	Jan 2013	B2
8404348	Kokko et al.	Mar 2013	B2
8408889	Schutt et al.	Apr 2013	B2
8512626	Johnson et al.	Aug 2013	B2
8585387	Oyamada et al.	Nov 2013	B2
8591213	Fare'	Nov 2013	B2
8591683	Fox et al.	Nov 2013	B2
8685870	Austin et al.	Apr 2014	B2
8802002	Berrigan et al.	Aug 2014	B2
8870559	Oyamada et al.	Oct 2014	B2
8968614	Desai et al.	Mar 2015	B2
9062398	Chou et al.	Jun 2015	B2
9194060	Westwood	Nov 2015	B2
9205006	Cheng et al.	Dec 2015	B2
9249527	Lee et al.	Feb 2016	B2
9260799	Tao	Feb 2016	B1
9260800	Tao	Feb 2016	B1
9260808	Schmidt et al.	Feb 2016	B2
9309612	Brown et al.	Apr 2016	B2
9322114	MacDonald et al.	Apr 2016	B2
9382643	Moore et al.	Jul 2016	B2
9404207	Matsubara et al.	Aug 2016	B2
9481954	Terakawa et al.	Nov 2016	B2
9546439	Coates et al.	Jan 2017	B2
9587329	Choi	Mar 2017	B2
9617658	Boscolo	Apr 2017	B2
9631321	Brennan et al.	Apr 2017	B2
9944047	Burt et al.	Apr 2018	B2
20010026815	Suetomi	Oct 2001	A1
20020053390	Allen	May 2002	A1
20020094352	Guo	Jul 2002	A1
20020125601	Allen	Sep 2002	A1
20020155776	Mitchler et al.	Oct 2002	A1
20030057613	Bansal et al.	Mar 2003	A1
20030114067	Matela et al.	Jun 2003	A1
20030162457	Berrigan et al.	Aug 2003	A1
20030200991	Keck et al.	Oct 2003	A1
20030203694	Deka et al.	Oct 2003	A1
20030211802	Keck et al.	Nov 2003	A1
20040045687	Shannon et al.	Mar 2004	A1
20050042964	Sommer et al.	Feb 2005	A1
20050043489	Datta et al.	Feb 2005	A1
20050133971	Haynes et al.	Jun 2005	A1
20050136772	Chen et al.	Jun 2005	A1
20050136781	Lassig et al.	Jun 2005	A1
20050148260	Kopacz et al.	Jul 2005	A1
20050148261	Close et al.	Jul 2005	A1
20060061006	Frey et al.	Mar 2006	A1
20060172647	Mehta et al.	Aug 2006	A1
20070026753	Neely et al.	Feb 2007	A1
20070049153	Dunbar et al.	Mar 2007	A1
20070065643	Kopacz et al.	Mar 2007	A1
20070090555	Roettger et al.	Apr 2007	A1
20070098768	Close et al.	May 2007	A1
20070148447	Amundson et al.	Jun 2007	A1
20070197117	Austin et al.	Aug 2007	A1
20070202769	Groner et al.	Aug 2007	A1
20070205530	Thompson	Sep 2007	A1
20080076315	McCormack et al.	Mar 2008	A1
20080095970	Takashima et al.	Apr 2008	A1
20080132866	Siqueira et al.	Jun 2008	A1
20080203602	Riedel et al.	Aug 2008	A1
20080315454	Angadjivand et al.	Dec 2008	A1
20090120048	Wertz et al.	May 2009	A1
20090233049	Jackson et al.	Sep 2009	A1
20100029164	Datta et al.	Feb 2010	A1
20100048082	Topolkaraev et al.	Feb 2010	A1
20100266818	Westwood et al.	Oct 2010	A1
20100324515	Boscolo	Dec 2010	A1
20110037194	James	Feb 2011	A1
20110045261	Sellars	Feb 2011	A1
20110104493	Barnholtz et al.	May 2011	A1
20110151196	Schmidt et al.	Jun 2011	A1
20110155338	Zhang et al.	Jun 2011	A1
20110159265	Hurley et al.	Jun 2011	A1
20120066855	Schmidt et al.	Mar 2012	A1
20120144611	Baker et al.	Jun 2012	A1
20120149273	Moore et al.	Jun 2012	A1
20120171919	Jackson et al.	Jul 2012	A1
20120238169	Mason et al.	Sep 2012	A1
20120274003	Conrad et al.	Nov 2012	A1
20130122771	Matsubara et al.	May 2013	A1
20130189892	Boscolo	Jul 2013	A1
20140170402	Knowlson et al.	Jun 2014	A1
20140308486	Butsch et al.	Oct 2014	A1
20140316362	Fiebig et al.	Oct 2014	A1
20150152571	Otani et al.	Jun 2015	A1
20150211158	Hassan et al.	Jul 2015	A1
20160002825	Cinquemani et al.	Jan 2016	A1
20160040337	Dutkiewicz et al.	Feb 2016	A1
20160136924	Lee et al.	May 2016	A1
20160215422	Rademacker et al.	Jul 2016	A1
20160221300	Sommer et al.	Aug 2016	A1
20170114483	Boscolo	Apr 2017	A1
20170121863	Gabler	May 2017	A1

Foreign Referenced Citations (142)

Number	Date	Country
1375579	Oct 2002	CN
1375580	Oct 2002	CN
1607269	Apr 2005	CN
1898420	Jan 2007	CN
101029433	Sep 2007	CN
201165568	Dec 2008	CN
201224821	Apr 2009	CN
201428047	Mar 2010	CN
101709534	May 2010	CN
101250761	Oct 2010	CN
101880942	Nov 2010	CN
101652509	Jul 2011	CN
101982600	Jan 2012	CN
202298095	Jul 2012	CN
202359338	Aug 2012	CN
202671824	Jan 2013	CN
202744675	Feb 2013	CN
202865547	Apr 2013	CN
203030116	Jul 2013	CN
203034226	Jul 2013	CN
203049208	Jul 2013	CN
102390074	Sep 2013	CN
102407552	Sep 2013	CN
203212803	Sep 2013	CN
102691135	Oct 2013	CN
203303753	Nov 2013	CN
203320250	Dec 2013	CN
102127842	Jul 2014	CN
203782356	Aug 2014	CN
203991115	Dec 2014	CN
102787374	Feb 2015	CN
103015039	Feb 2015	CN
104358024	Feb 2015	CN
103009768	Mar 2015	CN
103009779	Mar 2015	CN
204199080	Mar 2015	CN
103706343	Apr 2015	CN
204237975	Apr 2015	CN
204246954	Apr 2015	CN
103184540	May 2015	CN
204325695	May 2015	CN
104727015	Jun 2015	CN
103451754	Aug 2015	CN
103469317	Oct 2015	CN
103014900	Nov 2015	CN
105013248	Nov 2015	CN
103161032	Dec 2015	CN
105133062	Dec 2015	CN
105297288	Feb 2016	CN
205046307	Feb 2016	CN
105420860	Mar 2016	CN
103046230	Apr 2016	CN
105525436	Apr 2016	CN
205185492	Apr 2016	CN
105568446	May 2016	CN
105568560	May 2016	CN
105586717	May 2016	CN
103510164	Jun 2016	CN
104264237	Jun 2016	CN
205344053	Jun 2016	CN
105780297	Jul 2016	CN
105803541	Jul 2016	CN
103261503	Sep 2016	CN
106048742	Oct 2016	CN
205662683	Oct 2016	CN
104246045	Nov 2016	CN
205821651	Dec 2016	CN
106381613	Feb 2017	CN
206027248	Mar 2017	CN
106555236	Apr 2017	CN
106555257	Apr 2017	CN
106555276	Apr 2017	CN
206070124	Apr 2017	CN
106757771	May 2017	CN
206173594	May 2017	CN
106835417	Jun 2017	CN
105239175	Jul 2017	CN
106930003	Jul 2017	CN
106958079	Jul 2017	CN
104589523	Aug 2017	CN
106995983	Aug 2017	CN
107059246	Aug 2017	CN
107109741	Aug 2017	CN
107217392	Sep 2017	CN
107217393	Sep 2017	CN
206457605	Sep 2017	CN
206475548	Sep 2017	CN
206477111	Sep 2017	CN
206477112	Sep 2017	CN
206495044	Sep 2017	CN
206512388	Sep 2017	CN
206512389	Sep 2017	CN
105803668	Oct 2017	CN
105803683	Oct 2017	CN
107237046	Oct 2017	CN
206623256	Nov 2017	CN
104626510	Dec 2017	CN
105063892	Dec 2017	CN
105696192	Dec 2017	CN
107447372	Dec 2017	CN
107501986	Dec 2017	CN
206768289	Dec 2017	CN
105002660	Jan 2018	CN
105369365	Jan 2018	CN
106012299	Jan 2018	CN
106012301	Jan 2018	CN
107550835	Jan 2018	CN
107574583	Jan 2018	CN
206858772	Jan 2018	CN
206928050	Jan 2018	CN
206938146	Jan 2018	CN
106012300	Feb 2018	CN
106087248	Feb 2018	CN
107708637	Feb 2018	CN
0 891 06	Apr 1987	EP
4 744 21	Mar 1992	EP
4 744 22	Mar 1992	EP
6 333 39	Jan 1995	EP
7 010 10	Mar 1996	EP
9 873 52	Mar 2000	EP
8 661 52	Nov 2002	EP
1 270 770	Jan 2003	EP
1 302 592	Apr 2003	EP
8 220 53	Jun 2003	EP
2 167 714	Oct 2011	EP
54-103466	Aug 1979	JP
10-2004-0009721	Jan 2004	KR
0079034	Dec 2000	WO
0242043	May 2002	WO
WO-0238846	May 2002	WO
WO-03006735	Jan 2003	WO
WO-2004061181	Jul 2004	WO
WO-2015165272	Nov 2015	WO
WO-2016098157	Jun 2016	WO
WO-2017028421	Feb 2017	WO
WO-2017057028	Apr 2017	WO
WO-2017113574	Jul 2017	WO
WO-2017130784	Aug 2017	WO
WO-2017151676	Sep 2017	WO
WO-2017206177	Dec 2017	WO
WO-2018045041	Mar 2018	WO
WO-2018091453	May 2018	WO

Non-Patent Literature Citations (7)

Entry
Kimberly-Clark Corporation; and Kimberly-Clark Global Sales, LLC v. Extrusion Group, LLC; Extrusion Group Services LLC; EG Global, LLC; EG Ventures, LLC; Michael Houston; and Michael Cook, Civil Action No. 1:18-CV-04754; USDC, Northern District of Georgia, Complaint for Patent Infringement, Trade Secret Misappropriation, and Breach of Contract filed Oct. 15, 2018.
Kimberly-Clark Corporation; and Kimberly-Clark Global Sales, LLC v. Extrusion Group, LLC; Extrusion Group Services LLC; EG Global, LLC; EG Ventures, LLC; Michael Houston; and Michael Cook, Civil Action No. 1:18-CV-04754; USDC, Northern District of Georgia, Answer filed Nov. 29, 2018.
Kimberly-Clark Corporation; and Kimberly-Clark Global Sales, LLC v. Extrusion Group, LLC; Extrusion Group Services LLC; EG Global, LLC; EG Ventures, LLC; Michael Houston; and Michael Cook, Civil Action No. 1:18-CV-04754; USDC, Northern District of Georgia, First Amended Complaint for Patent Infringement, Trade Secret Misappropriation, and Breach of Contract filed Nov. 13, 2019.
Kimberly-Clark Corporation; and Kimberly-Clark Global Sales, LLC v. Extrusion Group, LLC; Extrusion Group Services LLC; EG Global, LLC; EG Ventures, LLC; Michael Houston; and Michael Cook, Civil Action No. 1:18-CV-04754; USDC, Northern District of Georgia, Answers, Affirmative Defenses, and Counterclaims to First Amended Complaint filed Dec. 4, 2019.
Kimberly-Clark Corporation; and Kimberly-Clark Global Sales, LLC v. Extrusion Group, LLC; Extrusion Group Services LLC; EG Global, LLC; EG Ventures, LLC; Michael Houston; and Michael Cook, Civil Action No. 1:18-CV-04754; USDC, Northern District of Georgia, Docket Report dated Dec. 10, 2019.
PCT International Application No. PCT/US2018/062345, International Search Report and Written Opinion, dated Jan. 31, 2019, 13 pgs.
Foreign Search Report on EP 18881033.7 dated Sep. 8, 2021.

Related Publications (1)

	Number	Date	Country
	20190153622 A1	May 2019	US

Provisional Applications (1)

	Number	Date	Country
	62590037	Nov 2017	US

Meltblown die tip assembly and method

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