CPC B29C 48/49 (2019.02) [B29C 48/30 (2019.02); B29C 48/37 (2019.02); B29D 30/52 (2013.01); B29C 48/07 (2019.02); B29C 48/307 (2019.02); B29C 48/387 (2019.02); B29K 2021/00 (2013.01); B29L 2030/002 (2013.01)] | 9 Claims |
1. An apparatus for forming a coextruded strip of a first compound A and a second compound B, the apparatus comprising:
a first extruder in fluid communication with a first gear pump for processing a first compound A; and
a second extruder in fluid communication with a second gear pump for processing a second compound B,
wherein the second compound B is different than the first compound A, wherein the outlet from the first gear pump is in fluid communication with a first channel of a coextrusion nozzle, and the outlet from the second gear pump is in fluid communication with a second channel of the coextrusion nozzle, wherein the co-extrusion nozzle has an insert having a distal end positioned adjacent to an outlet of the co-extrusion nozzle, wherein the insert divides the co-extrusion nozzle into first and second passageways, wherein a high pressure, low volume coextrusion zone is between the distal end of the insert and the outlet of the co-extrusion nozzle, wherein in the high pressure, low volume coextrusion zone, a first compound A flowstream merges with a second compound B flowstream to form a coextruded strip having a first layer of compound A and a second layer of compound B joined together at an interface.
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