Method of three layer injection molding with sequential and simu

Details Method of three layer injection molding with sequential and simu Method of three layer injection molding with sequential and simu

1998-12-03

2000-08-08

Ortiz, Angela

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

2643288, B29C 4516, B29C 4522

Patent

active

06099780&

ABSTRACT:
A method of multi-cavity valve gated three layer injection molding to form containers or preforms having a middle layer of a barrier material between inner and outer layers of a PET type material. The barrier material is injected through an annular channel in each heated nozzle simultaneously with the PET type material being injected through a central melt bore in each valve pin. This reduces cycle time and produces a thicker inner layer of PET.

REFERENCES:
patent: 4052497 (1977-10-01), Monnet
patent: 4174413 (1979-11-01), Yasuike et al.
patent: 4717324 (1988-01-01), Schad et al.
patent: 4978493 (1990-12-01), Kersemakers et al.
patent: 5221507 (1993-06-01), Beck et al.
patent: 5374178 (1994-12-01), Nakayama
patent: 5891381 (1999-04-01), Bemis et al.
Canadian Patent Application No. 2,201,415 to Schramm et al. laid open Oct. 4, 1997.

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