Multi-layer preform used for plastic blow molding

Details Multi-layer preform used for plastic blow molding Multi-layer preform used for plastic blow molding

1995-05-10

1998-09-08

Chen, Vivian

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 366, 428 3691, 428480, 4285428, 4289033, B32B 108, B32B 2708, B32B 2736

Patent

active

058043055

ABSTRACT:
A multi-layer preform used for plastic blow molding and a method for making the preform provides an inner layer of polyethylene naphthalate and an injection molded outer layer of homopolymeric 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 of homopolymeric polyethylene naphthalate by itself or along with a further inner layer of virgin polyethylene terephthalate is thermoformed prior to the injection molding of the outer layer of polyethylene terephthalate. A minimal amount of the homopolymeric polyethylene naphthalate which is relatively expensive can be utilized due to the thermoforming and injection molding as disclosed.

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