The present invention relates to injection molding, and more specifically to a melt delivery system between an outlet of a secondary injection unit and an inlet of a two-material mold.
Some injection molding machines are configured to have two barrels, i.e., a main injection unit and a secondary injection unit, in order to transfer two materials into a mold or molds, wherein the barrels may be parallel or perpendicular to each other. In another injection molding system, a main injection unit of an injection molding machine may be supplemented with an auxiliary injection unit that is operably attached thereto. The respective barrels of the main and auxiliary injection units, which may be parallel or perpendicular or of another orientation to each other, have a certain distance between them due to the size and complexity of the units. The secondary or offset barrel of the auxiliary injection unit is often situated outside of a stationary platen of the injection molding machine or press at a distance that in many instances is greater or larger than a distance between inlet or entry points (mold gates) of a two-material mold. Similarly, when a two-material mold is used in a two-material injection molding machine (molding press), barrels of the main and secondary injection units may be spaced apart in such a manner that outlets thereof do no align with the inlet or entry points of the mold. In either of the aforementioned dual injection unit set-ups, if the barrels' locations and configurations, as well as the locations of the inlet or entry points to the mold or molds, are fixed, a single stationary manifold can be used in a melt delivery system to transfer the melt from the offset secondary or auxiliary barrel to the offset inlet or entry point of the mold. If, however, an entry point on a mold for receiving a second material is not determined or a different mold or molds are to be used in the injection molding machine (molding press), which have different relatively positioned entry points than can be accommodated by a certain melt delivery system, it would be necessary to have a different, complete melt delivery system to transfer the melt from an offset secondary or auxiliary barrel to an offset entry point of the mold.
As should be evident from the preceding discussion, in two shot injection molding applications, the injection molding machine (molding press), either with two injection units or with main and auxiliary injection units, transfers two materials (a first material and a second material) to a mold via two inlet or entry points of the mold. One of the entry points of the mold usually aligns with a center of a platen (typically the stationary platen) of the injection molding machine, where a center locating ring mates with a bore in the stationary platen, and a main or center barrel of the main injection unit transfers a first material of the two materials to the mold. A second material is then transferred via the second inlet or entry point of the mold through a secondary or auxiliary barrel of a secondary or auxiliary injection unit. The secondary or auxiliary barrel is often located outside or away from the stationary platen. In many applications the secondary or auxiliary barrel may be parallel, perpendicular or at another orientation relative to the main or center barrel.
In many applications, the exit points (outlets) of the two barrels do not line up with the entry points (inlets) on the two-material mold for receiving the two materials and issues of leakage may arise during transfer of the first and/or second materials to the mold. Since one of the barrels of the injection units is often at the center of a platen (such as the main or center barrel of the injection molding machine), and generally one of the entry points (inlets) on the mold aligns with the center barrel, the main problem is to transfer a melt of a second material from the offset secondary or auxiliary barrel of the secondary or auxiliary injection unit to the offset entry point (inlet) on the mold for transferring the second material.
To make sure that a second material is transferred from the offset secondary or auxiliary barrel of the secondary or auxiliary injection unit to the offset entry point (inlet) of a two-material mold, a known melt delivery system (MDS) may be mounted on the stationary platen. A plate of the known MDS facing a two-material mold has mounting holes so the mold may be mounted on the MDS as if it was the stationary platen. An entry point (inlet) of the MDS aligns with an exit point (outlet) of the offset barrel, and an exit point (outlet) of the MDS aligns with an offset entry point (inlet) of the two-material mold. The known MDS has one customized manifold enclosed within plates that is suitable for only a single arrangement (relative positioning) of entry points (inlets) on a certain two-material mold.
A problem arises with the known MDS in that two-material molds are designed and built by different companies who use different standards or configurations in which a second, offset entry point (inlet) of various two-material molds for receiving a second material from the offset barrel of a secondary or auxiliary injection unit are typically different from mold to mold. To be able to run two-material molds having different inlet configurations in a given dual injection unit set-up, a particular or unique MDS would be needed with a manifold and associated plates to connect an exit point of the offset barrel with an offset entry point on the particular two-material mold. This means that each two-material mold with a differently located second material entry point needs to have a mating, custom or unique MDS.
Since a known MDS is similar in size to a platen of the injection molding machine or molding press, each MDS is expensive to build and, in reality, it is not practical to have a different MDS fabricated for each two-material mold configuration. Stated another way, often if there is a new two-material mold configuration, a new MDS that can mate therewith may be needed because an offset entry point of the mold for receiving the second material can be different for the new mold configuration. Unfortunately, to make a new, complete MDS for every change in mold configuration is expensive and time consuming, and thus not desirable.
Embodiment hereof are directed to a reconfigurable melt delivery system for use with a first injection unit and a second injection unit. The reconfigurable melt delivery system may include a first arm manifold, an exchangeable second arm manifold in fluid communication with the first arm manifold, and an outlet nozzle radially offset from a central machine nozzle opening of the melt delivery system, wherein the first arm manifold is configured to receive a moldable material from a second injection unit, and the second arm manifold is configured to receive the moldable material from the first arm manifold and to transfer the moldable material to the outlet nozzle for delivering the moldable material to a corresponding offset mold gate of a two-material mold.
In embodiments, the reconfigurable melt delivery system may further include one or more plates such as a mounting plate, a frame plate having a central opening that is closed on a first side by the mounting plate to form an enclosure, and a retainer plate having an insert plate releasably attached within a central opening thereof. In an embodiment, the reconfigurable melt delivery system may include the first arm manifold coupled with mounting and frame plates. In an embodiment, the second arm manifold may be coupled with retainer and insert plates to be disposed within an enclosure of the melt delivery system when the retainer and insert plates are attached to remaining plates of the system. In an embodiment, a platen side of a mounting plate (or another plate) may be configured to be secured against a platen of an injection molding machine. In an embodiment, mold facing surfaces of retainer and insert plates (or another outer plate) may include mounting holes therein for securing a two-material mold to the melt delivery system. In an embodiment, an outlet nozzle may be secured within a mold facing surface of an insert plate, or other replaceable plate.
In embodiments hereof, a reconfigurable melt delivery system may further include an inlet component for interfacing with an outlet of a second injection unit and for receiving a moldable material therefrom, wherein the inlet component may be secured to the melt delivery system to be in fluid communication with a first arm manifold for transferring the moldable material thereto.
In embodiments hereof, a reconfigurable melt delivery system may further include an enclosure defined within plates of the melt delivery system that may be at least partially covered on a mold side of the melt delivery system by a repositionable insert plate, wherein a second arm manifold may be coupled with the insert plate to be disposed within the enclosure when the insert plate is attached to the remaining plates.
In an embodiment, an outlet nozzle may be secured within a mold facing surface of an insert plate. In an embodiment, an insert plate may be configured to be repositioned relative to the remaining plates such that an outlet nozzle may be radially offset in different directions from a central machine nozzle opening depending on an orientation of the insert plate relative to the remaining plates.
In an embodiment, a second arm manifold of a reconfigurable melt delivery system may extend within an enclosure thereof from a first arm manifold to an outlet nozzle, wherein the second arm manifold may be repositioned within the enclosure relative to an insert plate to accommodate a change of a radial offset position of the outlet nozzle.
In an embodiment of a reconfigurable melt delivery system, a second arm manifold may be exchanged for another second arm manifold of a different length to accommodate a change of a radial offset position of an outlet nozzle.
Embodiments hereof are directed to a reconfigurable melt delivery system for use with a first injection unit and a second injection unit. The reconfigurable melt delivery system may include a first arm manifold configured to receive a moldable material from a second injection unit, an exchangeable second arm manifold in fluid communication with the first arm manifold that is configured to receive the moldable material from the first arm manifold and to transfer the moldable material to an outlet nozzle, and a repositionable and replaceable insert plate configured to be repositioned or replaced relative to remaining plates of the melt delivery system, wherein the outlet nozzle is secured within a mold facing surface of the insert plate and is radially offset from a central machine nozzle opening of the melt delivery system for delivering the moldable material to a corresponding offset mold gate of a two-material mold.
In embodiments, an exchangeable second arm manifold of a reconfigurable melt delivery system in accordance herewith may be exchanged for another second arm manifold of a different length.
In embodiments, a repositionable and replaceable insert plate a reconfigurable melt delivery system in accordance herewith may be repositioned relative to remaining plates such that an outlet nozzle is radially offset in different directions from a central machine nozzle opening depending on an orientation of the insert plate relative to the remaining plates. In an embodiment, a repositionable and replaceable insert plate may be configured to be replaced relative to remaining plates by another insert plate that is configured to position an outlet nozzle in a radially offset direction that corresponds with an offset mold gate of another two-material mold. In an embodiment, an insert plate may be configured to fit within a central opening of a retainer plate of remaining plates of the melt delivery system and may be configured to be repositioned within the central opening. In an embodiment, an enclosure may be defined within remaining plates of the melt delivery system that may be at least partially covered on a mold side of the melt delivery system by retaining and insert plates, wherein a second arm manifold may be coupled with the insert plate to be disposed within the enclosure when the retaining and insert plates are attached to the remaining plates. In an embodiment, a second arm manifold of a reconfigurable melt delivery system in accordance herewith may be repositioned within an enclosure of the system relative to an insert plate to accommodate a change of a radial offset position of an outlet nozzle.
The foregoing and other features and aspects of the present technology can be better understood from the following description of embodiments and as illustrated in the accompanying drawings. The accompanying drawings, which are incorporated herein and form a part of the specification, further serve to illustrate the principles of the present technology. The components in the drawings are not necessarily to scale.
Embodiments hereof are directed to a flexible or reconfigurable melt delivery system that solves the problems noted above. In accordance with an embodiment hereof, and as shown in
The reconfigurable melt delivery system 100 includes a primary or central machine nozzle opening 114 for receiving an outlet or machine nozzle of a main or central barrel of a main injection unit (not shown) there through. The machine nozzle of the main or central barrel of a main injection unit is used with the reconfigurable melt delivery system 100 for delivering a first moldable material to a first entry or inlet point of a two-material mold, such as a first mold gate M1 of a two-material mold M of
The reconfigurable melt delivery system 100 also includes a melt inlet component 116 for receiving and/or mating with an outlet of a secondary or auxiliary barrel of a secondary or auxiliary injection unit (not shown). In an embodiment, the melt inlet component 116 may alternatively be referred to as a second injection unit interface or a secondary nozzle interface. More particularly, the melt inlet component 116 includes an inlet 115 for receiving a second moldable material from a secondary or auxiliary barrel of a secondary or auxiliary injection unit (not shown) and for transferring the second moldable material to an offset (second) entry or inlet point of a two-material mold, such as a second mold gate M2 of the two-material mold M of
In accordance with embodiments hereof, the inlet 115 is in fluid communication with an offset second entry or inlet point of a two-material mold (such as a second mold gate M2 of the two-material mold M of
The mounting plate 102 is a planar piece that is configured to be positioned against a platen P, such as a stationary platen, of an injection molding machine (not shown). In an embodiment, each of the mounting plate 102, the frame plate 104 and the retainer plate 106 may include aligned bore holes that receive alignment pins 108 for aligning the joined plates on the platen P so that the melt delivery system 100 is properly position on the platen P, as would be understood by one of ordinary skill in the art.
The frame plate 104 includes a central opening or cut-out 110 there through that is closed on one side, the platen side, by the mounting plate 102 to form a pocket (enclosure) 112. The pocket (enclosure) 112 is sized to receive therein the second arm manifold 120 that is attached to a platen side of the insert plate 107, when the retainer and insert plates 106, 107 are attached to the mounting and frame plates 102, 104. As well various spacers 124 are disposed and arranged within the pocket 112 to support the retainer and insert plates 106, 107 when they are attached to a remainder of the reconfigurable melt delivery system 100, i.e., to mounting and frame plates 102, 104. Mold facing surfaces 106A, 107A of the retainer and insert plates 106, 107 include mounting holes 126 therein for securing a two-material mold (such the two-material mold M of
As discussed above, embodiments of reconfigurable melt delivery systems in accordance herewith may have two manifolds (arm manifolds) with a first, fixed length/size arm manifold, such as first arm manifold 118, fixedly attached to the system, and an exchangeable second arm manifold, such as second arm manifold 120, that may be selected to be any suitable length for extending between an outlet of the first arm manifold and an outlet nozzle (such as outlet nozzle 122) that is aligned with an offset (second) entry point of a respective two-material mold. In addition to the two arm manifolds, a smaller insert plate 107 may be provided that fits into the cut-out 105 in a large retainer plate (such as retainer plate 106) facing the mold. The smaller insert plate 107 with the corresponding second arm manifold 120 comprise a set of exchangeable components that can be designed, and fabricated within a short time, and may be much more cost effective to replace than making a completely new melt delivery system to bridge a distance between a second or auxiliary barrel outlet and an offset (second) entry point (offset mold gate) for each two-material mold configuration. Stated another way, in embodiments hereof, a second arm manifold and a corresponding insert plate may form a replaceable set of components of a reconfigurable melt delivery system in accordance herewith.
In addition to the features noted above, a respective insert plate 107 may be placed in a cut-out 105 of a retainer plate 106 in different orientations, such as rotated by 90, 180 and 270 degrees from an original orientation, so one insert plate 107 may accommodate four different offset (second) mold entry points when used with a second arm manifold of a suitable length to extend between an outlet of a first arm manifold and an outlet nozzle disposed on the insert plate. For instance in
With reference to
According to embodiments hereof, instead of constructing individual, complete melt delivery systems for each mold configuration, a reconfigurable or flexible melt delivery system having a mounting plate with retainer and frame plates and housing a fixed first arm manifold can be used in conjunction with a different second arm manifold, such as a longer or short second arm manifold, and an associated insert plate, which may form an exchangeable set of components, to accommodate two-material molds having different configurations or positioning of offset (second) entry/inlet points relative to main (first, central) entry/inlet points. Changing out only a portion (a set of a second arm manifold and associated insert plate) of a reconfigurable melt delivery system in accordance herewith offers a more cost effective and less time consuming solution to the problems noted above in the Background.
As well reconfigurable melt delivery systems in accordance herewith may reduce the number of components that are different or unique to each mold, and thus may reduce the number of components that need to be changed for a different exit point (outlet nozzle) of the system to match different entry points (inlets) of different two-material molds. As well in accordance with embodiments hereof, the number of components may be reduced due to reuse of many of the same components, e.g., the mounting, frame and retainer plates, and the first arm manifold, as well as the repositionable insert plate, for different mold configurations, such that any given component may be used again regardless of the location of a two-material mold's offset (second) entry/inlet point.
While various embodiments have been described above, it should be understood that they have been presented only as illustrations and examples of the present technology, and not by way of limitation. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the present technology. Thus, the breadth and scope of the present technology should not be limited by any of the above-described embodiments, but should be defined only in accordance with the appended claims and their equivalents. It will also be understood that each feature of each embodiment discussed herein, and of each reference cited herein, can be used in combination with the features of any other embodiment.
The present application claims the benefit of U.S. Appl. No. 62/253,592, filed Nov. 10, 2015, which is hereby incorporated by reference in its entirety.
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/US2016/061356 | 11/10/2016 | WO | 00 |