Method for making multi-layer preform used for plastic blow molding
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United States of America Patent
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-
Jul 29, 1997
Issued Date -
N/A
app pub date -
May 10, 1995
filing date -
Sep 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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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- Non-US Classification not provided for expired patents
Cited Art Landscape
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