Method of making multi-layer preform used for plastic blow moldi

Details Method of making multi-layer preform used for plastic blow moldi Method of making multi-layer preform used for plastic blow moldi

1993-09-10

1995-08-22

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264255, 264259, 264279, 264513, B29C 4514, B29C 4920, B29C 4906

Patent

active

054437660

ABSTRACT:
A multi-layer preform (26a,26b,26c) used for plastic blow molding and a method for making the preform provides an inner layer (28) of polyethylene naphthalate and an injection molded outer layer (30) of polyethylene terephthalate which has reduced transmission of gas upon blow molding as a container due to the gas barrier provided by the inner layer of polyethylene naphthalate. The inner layer (28) of polyethylene naphthalate by itself or along with a further inner layer (32) of virgin polyethylene terephthalate is thermoformed prior to the injection molding of the outer layer (30) of polyethylene terephthalate. A minimal amount of the polyethylene naphthalate which is relatively expensive can be utilized due to the thermoforming and injection molding as disclosed.

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Amoco-Bulletin FA-4d.

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