Patent Application
20210030085
The present invention relates generally to the field of protective facemasks, such as surgical facemasks, and more specifically to a method and system for manufacturing facemasks a production line.
Various configurations of disposable filtering facemasks or respirators are known and may be referred to by various names, including “facemasks”, “respirators”, “filtering face respirators”, “surgical facemasks”, and so forth. For purposes of this disclosure, such devices are referred to herein generically as “facemasks.”
The ability to supply aid workers, rescue personnel, and the general populace with protective facemasks during times of natural disasters or other catastrophic events is crucial. For example, in the event of a pandemic, the use of facemasks that offer filtered breathing is a key aspect of the response and recovery to such event. For this reason, governments and other municipalities generally maintain a ready stockpile of the facemasks for immediate emergency use. However, the facemasks have a defined shelf life, and the stockpile must be continuously monitored for expiration and replenishing. This is an extremely expensive undertaking.
Recently, investigation has been initiated into whether or not it would be feasible to mass produce facemasks on an “as needed” basis during pandemics or other disasters instead of relying on stockpiles. For example, in 2013, the Biomedical Advanced Research and Development Authority (BARDA) within the Office of the Assistant Secretary for Preparedness and Response in the U.S. Department of Health and Human Services estimated that up to 100 million facemasks would be needed during a pandemic situation in the U.S., and proposed research into whether this demand could be met by mass production of from 1.5 to 2 million facemasks per day to avoid stockpiling. This translates to about 1,500 facemasks per minute. Current facemask production lines are capable of producing only about 100 facemasks per minute due to technology and equipment restraints, which falls far short of the estimated goal. Accordingly, advancements in the manufacturing and production processes will be needed if the goal of “on demand” facemasks during a pandemic is to become a reality.
Certain configurations of pleated facemasks include head fastening ties bonded to opposite edges of a rectangular body. Forming the rectangular bodies and attaching the ties may include cutting the web into the rectangular bodies, rotating the rectangular bodies, and then attaching the ties. For example, a web of textile material may be conveyed in a machine direction and pleats or folds may be formed extending in the machine direction. The web may then be cut at regular intervals along the cross-machine direction to form rectangular bodies. Each rectangular body may then be rotated 90 degrees with respect to the machine direction, and the ties may then be attached to the rectangular bodies along the edges of the rectangular bodies with respect to the machine direction. Rotating the rectangular bodies and attaching the ties using the current manual and automated methods for manufacturing, however, is relatively slow. For mass production of facemasks at the throughputs mentioned above, it would be desirable to form the rectangular bodies and attach the ties while maintaining the high production speeds of the running line.
Additionally, the configuration described above may create elevated stresses where the ties attach to the rectangular body, which can increase the risk of failure at such locations. More specifically, during use, the ties are wrapped around the crown of the head of the user. This can pull the ties at angles that are not perpendicular to any edge of the facemask, causing increased tension and stress in the ties and or rectangular body near where they are attached to each other.
The present invention addresses this need and provides a robust facemask that is better suited for high speed manufacturing as well as a manufacturing method thereof.
Objects and advantages of the invention will be set forth in the following description, or may be obvious from the description, or may be learned through practice of the invention.
In accordance with aspects of the invention, a facemask has a longitudinal direction and a lateral direction that is perpendicular to the longitudinal direction. The facemask includes a mask body having a generally rectangular shape, a pair of lateral edges extending in the lateral direction, and a pair of longitudinal edges extending in the longitudinal direction. At least one tie is attached to the mask body and extends away from the mask body in a direction that forms an angle with the longitudinal direction which ranges from about 10 degrees to about 80 degrees.
In a particular embodiment, the pair of lateral edges are free of any ties along a substantial portion of a length of the lateral edges.
In another particular embodiment, the pair of longitudinal edges are free of any ties along a substantial portion of a length of the longitudinal edges.
In another particular embodiment, the pair of lateral edges are free of any ties along a substantial portion of a length of the lateral edges, and the pair of longitudinal edges are free of any ties along a substantial portion of a length of the longitudinal edges.
In another particular embodiment, the mask body has a pair of upper corners. The facemask includes a pair of upper ties each having an attached end and a free end. The attached end of each upper tie is attached to the mask body adjacent a respective one of the pair of upper corners. Each of the pair of upper ties extends away from the mask body in a direction that forms an upper tie angle with the longitudinal direction, and the upper tie angle ranges from about 10 degrees to about 80 degrees.
In another particular embodiment, the mask body has a pair of lower corners. The facemask includes a pair of lower ties that are separate from the pair of upper ties. Each of the pair of lower ties has an attached end and a free end. The attached end of each lower tie attached to the mask body adjacent a respective one of the pair of lower corners. Each of the pair of lower ties extends away from the mask body in a lower tie direction that forms a lower tie angle with the longitudinal direction. The lower tie angle ranges from about 10 degrees to about 80 degrees.
In another particular embodiment, the facemask includes a single tie having a first free end, a second free end, and a middle portion therebetween. The middle portion is attached along one of the longitudinal edges of the mask body.
In another particular embodiment, the angle is selected such that at least one tie extends approximately in a tension direction along which the at least one tie is pulled when worn.
In another particular embodiment, at least one tie is ultrasonically bonded to the mask body.
In another particular embodiment, the mask body has a pair of upper corners. The facemask includes an upper tie having a first free end, a second free end, and a middle portion therebetween. The middle portion is attached along the upper longitudinal edge between the pair of upper corners. The upper tie comprises a pair of folds adjacent each of the pair of upper corners such that the first and second free ends extend away from the mask body in directions that form upper tie angles with the longitudinal direction. Each upper tie angle ranges from about 10 degrees to about 80 degrees.
In another particular embodiment, the mask body has a pair of upper corners and a pair of lower corners. The facemask includes a lateral tie having a first free end, a second free end, and a middle portion therebetween. The middle portion is attached along one of the lateral edges between one of the pair of upper corners and one of the pair of lower corners. The lateral tie includes a pair of folds. One of the pair of folds is adjacent one of the pair of upper corners, and the other of the pair of folds is adjacent one of the pair of lower corners. The first and second free ends of the lateral tie extend away from the mask body in directions that form upper and lower tie angles with the longitudinal direction. The upper and lower tie angles range from about 10 degrees to about 80 degrees.
In accordance with other aspects of the invention, an automated method is provided for manufacturing facemasks from a web material of a textile product in a production line. The method includes conveying the web material of the textile product in the production line along a machine direction. The method includes cutting, at a cutting station, the web material along a cutting line extending in a cross-machine direction that is perpendicular to the machine direction. The method includes attaching, at a tie attaching station, at least one tie to the web material at a location adjacent the cutting line such that the at least one tie extends in a direction that forms an angle with the cutting line. The angle ranges from about 10 degrees to about 80 degrees.
In a particular embodiment, the web material is cut at the cutting station before the tie is attached to the web material at the tie attaching station. In another particular embodiment, the tie is attached to the web material at the tie attaching station before the web material is cut at the cutting station.
In another particular embodiment, the method includes attaching a pair of upper ties to the web material such that the upper ties extend from the web material in respective directions that form respective upper tie angles with the cutting line. Each upper tie angle ranges from about 10 degrees and about 80 degrees.
In another particular embodiment, the method includes attaching a pair of lower ties to the web material such that the lower ties extend from the web material in respective directions that form respective lower tie angles with the cutting line. Each lower tie angle ranges from about 10 degrees and about 80 degrees.
In another particular embodiment, cutting the web material includes forming a separate mask body from the web material. The method further includes attaching a tie to the separate mask body such that the tie extends beyond each of a first lateral edge and a second lateral edge of the separate mask body.
In another particular embodiment, the method includes attaching the at least one tie to the web such that the at least one tie extends beyond each of a first lateral edge and a second lateral edge of the separate mask body. The method further includes folding the tie such that a first free end and a second free end of the tie extend away from the web in respective directions that form respective tie angles with the cutting line. Each tie angle ranges from about 10 degrees and about 80 degrees.
In another particular embodiment, the method includes attaching a middle portion of a lateral tie to the mask body adjacent a lateral edge of the mask body. In some embodiments, the method includes folding the lateral tie adjacent each of an upper corner and a lower corner such that each of a first free end and a second free end of the lateral tie extend away from the mask body in respective directions that form respective lateral tie angles with the cutting line, wherein the lateral tie angles range from about 10 degrees and about 80 degrees.
In another particular embodiment, the method includes alternately producing at least two different types of facemasks on a single production line system.
A full and enabling disclosure of the present invention, including the best mode thereof to one skilled in the art, is set forth more particularly in the remainder of the specification, including reference to the accompanying figures, in which:
Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the present invention.
Reference now will be made in detail to various embodiments of the invention, one or more examples of which are set forth below. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents. For the purposes of this application, like features will be represented by like numbers between the figures.
Generally speaking, the present disclosure is directed to a facemask and method for producing a facemask. The facemask may include upper and/or lower ties that are attached such that they form an angle between about 10 degrees and about 80 degrees with a longitudinal direction of the facemask. When the facemask is worn, the ties may be pulled tight by the head of the wearer. The ties may extend from a mask body of the facemask such that the ties are approximately aligned with a direction in which they are pulled during use, e.g., in a “tension direction”. For example, the ties may extend away from the mask body in a direction that forms an angle with a longitudinal direction, and that angle may range from about 10 degrees to about 80 degrees, in some embodiments from about 20 degrees to about 60 degrees, and in some embodiments from about 30 degrees to about 50 degrees, e.g., about 45 degrees. Such a configuration may reduce stress where the ties are attached to the mask body and improve the durability of the facemask. Additionally, folding and/or rippling of the mask body and/or ties may be reduced resulting in a more comfortable and/or aesthetically pleasing facemask.
The mask body of the facemask may be formed from a variety of suitable textile products. For purposes of this invention, the term “textile product” includes a web that has a structure of individual fibers or threads which are interlaid, but not in an identifiable, repeating manner—commonly referred to as a “nonwoven web”. Nonwoven webs have been, in the past, formed by a variety of processes such as, for example, meltblowing processes, spunbonding processes, and bonded carded web processes. The term “meltblown fibers” means fibers formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries as molten threads or filaments into a high velocity gas (e.g. air) stream which attenuates the filaments of molten thermoplastic material to reduce their diameter, which may be to microfiber diameter. Thereafter, the meltblown fibers are carried by the high velocity gas stream and are deposited on a collecting surface to form a web of randomly disbursed meltblown fibers. The term “spunbonded fibers” refers to small diameter fibers which are formed by extruding a molten thermoplastic material as filaments from a plurality of fine, usually circular, capillaries of a spinnerette with the diameter of the extruded filaments then being rapidly reduced as by, for example, eductive drawing or other well-known spunbonding mechanisms. The term “textile product” may also include fabrics formed using any suitable technique, however.
Additionally, “textile product” may refer to a variety of suitable materials, including, for example, polypropylene, polyethylene, or polyester. These materials may include, for example, fiber-grade spunbond polypropylene (SBPP), fiber-grade melt-blown polypropylene (MBPP), and low density polyethylene (LDPE). Any suitable material, however, may be used to form a facemask in accordance with aspects of the present disclosure.
In accordance with aspects of the present disclosure, a method of making facemasks may include conveying the web material of the textile product in the production line along a machine direction. The method may include cutting, at a cutting station, the web material along a cutting line extending in a cross-machine direction that is perpendicular to the machine direction. The method may also include attaching, at a tie attaching station, at least one tie to the web material at a location adjacent the cutting line such that the at least one upper tie extends in a direction that forms an angle with the cutting line, wherein the angle ranges from about 10 degrees to about 80 degrees.
A single production line system may be configured to produce a variety of facemask types, as described in greater detail below. For example, four separate ties may be attached to respective corners of the mask body. Alternatively, a single lower tie may be attached along a lower longitudinal edge of the mask body and optionally folded such that free ends of the single lower tie extends at an angle that ranges from about 10 degrees to about 80 degrees with the longitudinal direction. Other facemask embodiments are described in greater detail below. Regardless, in some embodiments, a single production line system may be configured to switch between various facemask types with minimal or no downtime required (e.g., to adjust settings of the system). For example, in some embodiments, a single production line may be configured to produce two or more different types of facemasks in alternation.
Referring to
Referring to
This configuration may provide several advantages when compared with conventional facemask designs such as the designs illustrated in
In some embodiments, the pair of lower ties 114 may be separate from the pair of upper ties 112. Each of the ties 112, 114 may have an attached end 118 and a free end 120. The attached end 118 of each lower tie 114 may be attached to the mask body 106 adjacent a lower corner 122 of the mask body 106, and the attached end 118 of each upper tie 112 may be attached to the mask body adjacent an upper corner 124 of the mask body 106. Each of the pair of upper ties 112 may extend away from the mask body 106 in a direction that forms an upper tie angle 126 with the longitudinal direction 102, and each of the pair of lower ties 114 may extend away from the mask body 106 in a direction that forms a lower tie angle 128 with the longitudinal direction 102. The upper and lower tie angles 126, 128 may range from about 10 degrees to about 80 degrees, in some embodiments from about 20 degrees to about 60 degrees, and in some embodiments from about 30 degrees to about 50 degrees, e.g., about 45 degrees.
The upper tie angles 126 may be equal to or different than the lower tie angles 128. Generally, however, the upper tie angles 126 may be equal to each other, and the lower tie angles may be equal to each other. However, in some embodiments, the lower ties 114 may have lower tie angles 128 that are different from each other; and the upper ties 112 may similarly have upper tie angles 126 that are different from each other.
In some embodiments, the upper and lower tie angles 126, 128 may be selected based on the angles that the ties are pulled during use. For example, the upper tie angle 126 may be selected to approximate the angle that the upper ties 112 will be pulled when tied behind a head of a wearer. Similarly, the lower tie angles 128 may be selected to approximate the angle that the lower ties 114 will be pulled tied behind a neck of the wearer.
Still referring to
Referring to
In an alternative embodiment, the facemask 100 may include a single upper tie and a pair of lower ties. In other words, the facemask may be configured such that the upper and lower ties 112, 114 are effectively vertically flipped with respect to the embodiment described with reference to
Referring to
A folded single lower tie 130 may be similarly attached and folded. For example, the folded single lower 130 tie may be attached to the mask body 106 along a middle portion 136 of the single lower tie 130 that is between a first free end 132 and a second free end 134, in a similar manner as the folded single upper tie 138. The single lower tie 130 may include a pair of folds 140 such that each free end extends at a respective lower tie angle 128 with respect to the longitudinal direction 102.
In some embodiments, the folds 140 in the ties 130, 138 may be retained by additional bonding. For example, the folds 140 may include folded portions having an upper layer of fabric that overlays a lower layer of fabric. The upper layer of fabric may be attached (e.g., bonded) to the lower layer of fabric, which may help retain the fold 140. In other embodiments, however, the upper layer may not be attached to the lower layer.
Referring to
It should be understood that the above-described configurations may be combined in various ways to produce various additional embodiments. For example, referring to
The pair of upper ties 112 may be attached along respective portions of the lateral edges 108 and similarly have free ends 120, attached ends 118, and folds 140 at the upper corners 124. For example, the upper ties 112 may be attached along 5% or less of the length of the lateral edges 108, in some embodiments 10% or less, and in some embodiments 25% or less. Upper tie angles 126 may be formed between a free portion 148 of each upper tie 112 and the longitudinal direction 102. The upper and lower tie angles 126, 128 may be between 10 degrees and 80 degrees, as described above. It should be understood that the upper ties 112 may instead be attached along the longitudinal edge 110, and the lower ties 114 may instead be attached along the lateral edge 108. Yet other variations or combinations are possible within the scope of this disclosure.
Referring to
In some embodiments, the cutting step, at (204), may be performed before the attaching step, at (206), as illustrated in
In accordance with aspects of the present disclosure, a production line system may provide rapid production of distinct types of facemasks on a single production line. For example, the production line system may be capable of switching from one type of facemask to another type of facemask without requiring downtime to make adjustments (e.g., swap or adjust components) or to change settings of the production line system. For example, the production line system may be capable of producing, in alternation, combinations of the various types of facemask described herein. For instance, the production line system may be capable of producing in alternation facemasks having lateral ties and facemasks having upper and lower ties.
The production line system 300 may also include a cutting station 306 and a tie attaching station 308. The conveying apparatus may convey a web material 302 in a machine direction 310 to the cutting station 306. The cutting station 306 may cut the web material 302 along a cutting line 312 extending in a cross-machine direction 314 that is perpendicular to the machine direction 310 to form lateral edges 313 of the mask body 316. As a result, the cutting station 306 may cut the web material 302 into a series of mask bodies 316.
The conveying apparatus may then convey the mask bodies 316 (cut from the web material 302) to the tie attaching station 308. The tie attaching station 308 may attach a pair of upper ties 318 and a pair of lower ties 320 to each mask body 316 to form an individual facemask 322. The tie attaching station 308 may attach the upper ties 318 at a location adjacent the cutting line 312 such that at least one upper tie 318 extends in a direction that forms an angle 324 with the cutting line 312 that ranges from about 10 degrees to about 80 degrees, in some embodiments from about 20 degrees to about 60 degrees, and in some embodiments from about 30 degrees to about 50 degrees, e.g., about 45 degrees. The lateral direction of the facemasks 322 may correspond with the cross-machine direction 314, and the longitudinal direction of the facemasks may correspond with the machine direction.
Referring to
Referring to
As indicated above, in some embodiments, the production line system 300 may be capable of producing multiple types of facemasks. For example, referring to
Referring to
In some embodiments, the ties 330 may be folded after the cutting station 306 cuts the ties 330. For example, the tie attaching station 308 may attach the lateral ties 330 but leave the lateral ties 330 unfolded such that the lateral ties 330 generally extend in the cross-machine direction 314. This may allow the cutting station 306 to more easily cut the web 302 without the lateral ties 330 interfering. A folding station may be configured to then fold the lateral ties 330.
Referring to
Referring to
In some embodiments, the tie attaching station 308 may not fold the upper and lower ties 318, 320. Instead, the tie attaching station 308 may attach the upper and lower ties 318, 320 and leave the upper and lower ties 318, 320 unfolded such that the upper and lower ties 318, 320 extend generally in the cross-machine direction 314. This may allow the cutting station 306 to more easily cut the web 302 along the cutting lines 312. Next, a folding station may fold the upper and lower ties 318, 320 such that the upper and lower ties 318, 320 form respective angles with the cutting lines 312 between about 10 degrees and about 90 degrees, for example as described above.
The ties may be attached to the web using a variety of suitable techniques. For example, such techniques may include stitching, adhesives, and/or thermal bonding. For instance, in some embodiments, ultrasonic bonding may be used. Any suitable technique may be used, however.
The tie attaching station 302 may include a variety of suitable apparatuses for attaching and/or folding the ties. For example, a robotic or actuated arm may be configured to arrange and/or fold the ties as required. Additionally, in some embodiments, the tie attaching station 302 may be configured to fold the ties before attaching them, while in other embodiments, the tie attaching station 302 may be configured to attach the ties before folding them. As indicated above, in other embodiments, a separate tie folding station may be configured to fold the ties. In some embodiments, the folding station may fold the ties before the tie attaching station attaches the ties. In other embodiments, the folding station may be configured to fold the ties after the tie attaching station 30 attaches the ties and/or after the cutting station 306 cuts the web 302 to form separate facemasks 322. In some embodiments, the tie attaching station 302 and/or folding station may be further configured to secure the folds using a variety of methods, including for example, stitching, ultrasonic bonding, etc.
One of ordinary skill in the art would understand that yet further combinations of the various embodiments described herein are possible and within the scope of this disclosure.
The material particularly shown and described above is not meant to be limiting, but instead serves to show and teach various exemplary implementations of the present subject matter. As set forth in the attached claims, the scope of the present invention includes both combinations and sub-combinations of various features discussed herein, along with such variations and modifications as would occur to a person of skill in the art.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2018/027500 | 4/13/2018 | WO | 00 |
