05443766 is referenced by 39 patents and cites 69 patents.

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.

Title
Method of making multi-layer preform used for plastic blow molding
Application Number
8/120038
Publication Number
5443766
Application Date
September 10, 1993
Publication Date
August 22, 1995
Inventor
Richard C Darr
Seville
OH, US
William A Slat
Brooklyn
MI, US
Agent
Brooks & Kushman
Assignee
Plastipak Packaging
MI, US
IPC
B29C 49/06
B29C 49/20
B29C 45/14
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