Method for making multi-layer preform used for plastic blow mold

Details Method for making multi-layer preform used for plastic blow mold Method for making multi-layer preform used for plastic blow mold

1995-05-10

1997-07-29

Timm, Catherine

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

264259, 264511, 264513, 428 357, 428 366, 4285428, 4289033, B29G 4922

Patent

active

056519338

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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