05804305 is referenced by 32 patents and cites 73 patents.

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.

Title
Multi-layer preform used for plastic blow molding
Application Number
120038
Publication Number
5804305
Application Date
May 10, 1995
Publication Date
September 8, 1998
Inventor
Richard C Darr
Seville
OH, US
William A Slat
Brooklyn
MI, US
Agent
Brooks & Kushman P C
Assignee
Plastipak Packaging
MI, US
IPC
B32B 27/36
B32B 27/08
B32B 1/08
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