초록 ▼

An extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, includes a die body having a die face, a profile channel defined in the die body and communicating with a profile die opening in the die face for extruding a profile portion, and a base chan

An extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, includes a die body having a die face, a profile channel defined in the die body and communicating with a profile die opening in the die face for extruding a profile portion, and a base channel defined in the die body and communicating with a base die opening in the face for extruding a base portion. The channels are adjacent to each other near the die openings and separated by a portion of the die body which terminates short of the face so that the extruded profile and base portions join together before exiting the die body.

대표청구항 ▼

1. A coextrusion apparatus for use with extruder means for forming a plurality of combined interlocking closure strips having profile portions and base portions, comprising, in combination: (a) extruder channels communicating with said extruder means for receiving a plurality of plastic feed mate

1. A coextrusion apparatus for use with extruder means for forming a plurality of combined interlocking closure strips having profile portions and base portions, comprising, in combination: (a) extruder channels communicating with said extruder means for receiving a plurality of plastic feed materials under pressure from said extruder means. (b) flow diverter means communicating with said extruder channels, and adapted to establish alternate distribution patterns for said plastic feed materials, said flow diverter means comprising at least a first base channel for receiving a first plastic feed material and communicating with a removable first base control bar for forming a first base portion of said closure strips, said flow diverter means further comprising a plurality of channels for receiving a second plastic feed material, one of said plurality of channels comprising a first profile channel communicating with a removable first profile control bar for forming a first profile portion of said closure strips, one of said plurality of channels comprising a second base channel commuicating with a removable second base control bar for forming a second base portion of said closure strips, and one of said plurality of channels comprising a second profile channel communicating with a removable second profile control bar for forming a second profile portion of said closure strips; (c) a removable first base control bar communicating with said first base channel, said first base control bar having a first base portion die opening for extruding a first base portion; (d) a removable first profile control bar communicating with said first profile channel, said first profile control bar having a first profile portion die opening for extruding a first profile portion; (e) a removable second base control bar communicating with said second base channel, said second base control bar having a second base portion die opening for extruding a second base portion; and (f) a removable second profile control bar communicating with said second profile channel, said second profile control bar having a second profile portion die opening for extruding a second profile portion. 2. A coextrusion apparatus as in claim 1 wherein said first base portion die opening and said first profile portion die opening merge prior to the exit of said die openings. 3. A coextrusion apparatus as in claim 1 wherein said second base portion die opening and said second profile portion die opening merge prior to the exit of said die openings. 4. A coextrusion apparatus as in claim 1 wherein said first base portion die opening and said first profile portion die opening merge prior to the exit of said die opening, and said second base portion die opening and said second profile portion die opening merge prior to the exit of said die openings. 5. A coextrusion apparatus as in claim 1 wherein said first base channel is adapted to receive plastic feed materials having a composition different from the plastic feed materials received by said first profile channel. 6. A coextrusion apparatus as in claim 1 wherein said first base channel is adapted to receive plastic feed materials containing a color agent for said first base portion of said closure strips. 7. A coextrusion apparatus as in claim 1 including means adapted to control the flow of plastic feel materials within each of said first base channel, said first profile channel, said second base channel, and said second profile channel. 8. A coextrusion apparatus as in claim 7 wherein said means comprises a flow control orifice. 9. A coextrusion apparatus as in claim 7 wherein said means comprises adjustable valve control means. 10. A coextrusion apparatus for use with extruder means for forming a plurality of combined interlocking closure strips having profile portions and base portions, comprising, in combination: (a) extruder channels communicating with said extruder means for receiving a plurality of plastic feed materials under pressure from said extruder means; (b) flow diverter means communicating with said extruder channels, and adapted to establish alternate distribution patterns for said plastic feed materials, said flow diverter means comprising at least a first channel for receiving a first plastic feed material and communicating with a removable first control bar for forming a first portion of a first closure strip, said flow diverter means further comprising a plurality of channels for receiving a second plastic feed material, one of said plurality of channels comprising a second channel communicating with a removable second control bar for forming a second portion of said first closure strip, one of said plurality of channels comprising a third channel communicating with a removable third control bar for forming a first portion of a second closure strip, and one of said plurality of channels comprising a fourth channel communicating with a removable fourth control bar for forming a second portion of said second closure strip; (c) a removable first control bar communicating with said first channel, said first control bar having a first portion die opening for extruding a first portion of a first closure strip; (d) a removable second control bar communicating with said second channel, said second control bar having a second portion die opening for extruding a second portion of said first closure strip; (e) a removable third control bar communicating with said third channel, said third control bar having a first portion die opening for extruding a first portion of a second closure strip; and (f) a removable fourth control bar communicating with said fourth channel, said fourth control bar having a second portion die opening for extruding a second portion of said second closure strip. 11. A coextrusion apparatus as in claim 10 wherein said first portion die opening of said first control bar and said second portion die opening of said second control bar merge prior to the exit of said die openings. 12. A coextrusion apparatus as in claim 10 wherein said first portion die opening of said third control bar and said second portion die opening of said fourth control bar merge prior to the exit of said die openings. 13. A coextrusion apparatus as in claim 10 wherein said first portion die opening of said first control bar and said second portion die opening of said second control bar merge prior to the exit of said die openings, and said first portion die opening of said third control bar and said second portion die opening of said fourth control bar merge prior to the exit of said die openings. 14. A coextrusion apparatus as in claim 10 wherein said first channel is adapted to receive a plastic feed material having a composition different from the plastic feed material received by said second channel. 15. A coextrusion apparatus as in claim 10 wherein said first channel is adapted to receive a plastic feed material containing a coloring agent. 16. A coextrusion apparatus as in claim 10 wherein said first control bar has a die opening for extruding the base portion of said first closure strip. 17. A coextrusion apparatus as in claim 10 wherein said first control bar has a die opening for extruding the profile portion of said first closure strip. 18. A coextrusion apparatus as in claim 10 including means adapted to control the flow of plastic feed materials within each of said first base channel, said first profile channel, said second base channel, and said second profile channel. 19. A coextrusion apparatus as in claim 18 wherein said means comprises a flow control orifice. 20. A coextrusion apparatus as in claim 18 wherein said means comprises adjustable valve control means. 21. A method for coextruding a plurality of combined interlocking closure strips having profile portions and base portions, comprising the steps: (a) extruding a plurality of plastic feed materials under pressure into extruder channels communicating with a flow diverter means; (b) establishing alternate distribution patterns for said plastic feed materials with said flow diverter means whereby the plastic feed materials from one of said extruder channels passes to a first channel communicating with a removable first control bar for forming a first base portion of a first closure strip, and the plastic feed materials from another of said extruder channels passes to a plurality of channels, wherein one of said plurality of channels comprises a second channel communicating with a removable second control bar for forming a first profile portion of said first closure strip, one of said plurality of channels comprises a third channel communicating with a removable third control bar for forming a second base portion of a second closure strip, and one of said plurality of channels comprises a removable fourth channel communicating with a fourth control bar for forming a second profile portion of said second strip; (c) passing said plastic feed material from said first channel to the die opening for said removable first control bar, and extruding a first base portion of a first closure strip therefrom; (d) passing said plastic feed material from said second channel to the die opening of said removable second control bar, and extruding a first profile portion of said first closure strip therefrom; (e) passing said plastic feed material from said third channel to the die opening of said removable third control bar, and extruding a second base portion of a second closure strip therefrom; and (f) passing said plastic feed material from said fourth channel to the die opening of said removable fourth control bar, and extruding a second profile portion of said second closure strip therefrom. 22. A method in accordance with claim 21 including joining the extrudates from said first control bar and said second control bar before said extrudates exit from the die openings of said first control bar and said second control bar. 23. A method in accordance with claim 21 including joining the extrudates from said third control bar and said fourth control bar before said extrudates exit from the die openings of said third control bar and said fourth control bar. 24. A method in accordance with claim 21 including joining the extrudates from said first control bar and said second control bar before said extrudates exit from the die openings of said first control bar and said second control bar, and joining the extrudates from said third control bar and said fourth control bar before said extrudates exit from the die openings of said third control bar and said fourth control bar. 25. A method in accordance with claim 21 wherein said plastic feed material in said first channel has a composition different from the plastic feed material of said second channel. 26. A method in accordance with claim 21 wherein said plastic feed material in said first channel contains a coloring agent for said first portion of said first closure strip. 27. A method in accordance with claim 21 including controlling the flow of said plastic feed materials within each of said first channel, said second channel, said third channel, and said fourth channel. 28. A method in accordance with claim 27 including controlling said flow of said plastic feed materials by a flow control orifice. 29. A method in accordance with claim 27 including controlling said flow of said plastic feed materials by adjustable valve control means. 30. A method for coextruding a plurality of combined interlocking closure strips having profile portions and base portions, comprising the steps: (a) extruding a plurality of plastic feed materials under pressure into extruder channels communicating with a flow diverter means; (b) establishing alternate distribution patterns for said plastic feed materials with said flow diverter means whereby the plastic feed materials from one of said extruder channels passes to a second base channel communicating with a removable first control bar for forming a second base portion of said closure strips, and the plastic feed materials from another of said extruder channels passes to a plurality of channels wherein one of said plurality of channels comprises a first profile channel communicating with a removable second control bar for forming a first profile portion of said closure strips, one of said plurality of channels comprising a first base channel communicating with a removable third control bar for forming a first base portion of said closure strips, and one of said plurality of channels comprising a second profile channel communicating with a removable fourth control bar for forming a second profile portion of said closure strips; (c) controlling the flow of said plastic feed materials within said channels by control orifice and adjustable valve control means communicating with each of said first base channel, said first profile channel, said second base channel, and said second profile channel; (d) passing said plastic feed materials from said second base channel to the die opening for said removable first control bar, and extruding a second base portion therefrom; (e) passing said plastic feed materials from said first profile channel to the die opening of said removable second control bar, and extruding a first profile portion therefrom; (f) passing said plastic feed materials from said first base channel to the die opening of said removable third control bar, and extruding a first base portion therefrom; and (g) passing said plastic feed materials from said second profile channel to the die opening of said removable fourth control bar, and extruding a second profile portion therefrom. 31. A method in accordance with claim 30 including joining the extrudates from said first control bar and said fourth control bar before said extrudates exit from the die openings of said first control bar and said fourth control bar. 32. A method in accordance with claim 30 including joining the extrudates from said second control bar and said third control bar before said extrudates exit from the die openings of said second control bar and said third control bar. 33. A method in accordance with claim 30 including joining the extrudates from said first control bar and said fourth control bar before said extrudates exit from the die openings of said first control bar and said fourth control bar, and joining the extrudates from said second control bar and said third control bar before said extrudates exit from the die openings of said second control bar and said third control bar. 34. A method in accordance with claim 30 wherein said plastic feed materials in said second base channel has a composition different from the plastic feed materials of said second profile channel. 35. A method in accordance with claim 30 wherein said plastic feed materials in said second bar channel contain a coloring agent for said second base portion of said closure strips.