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Injection molded preform, method of treating same and container formed therefrom

  • US 4,928,835 A
  • Filed: 01/31/1989
  • Issued: 05/29/1990
  • Est. Priority Date: 01/31/1989
  • Status: Expired due to Term
First Claim
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1. A plastic preform for forming a hollow blow molded plastic container, said preform being of an injection molded construction and including a neck finish, said neck finish terminating at a free end in an end sealing surface and having remote from said end sealing surface a lower flange with there being high tolerance molded threads between said end sealing surface and said flange, said preform also including a container shoulder forming portion next to said flange remote from said threads, and a body forming portion, a part of said shoulder forming portion being a crystallized part and of a greater strength than adjacent parts of said preform, said preform being further improved by said end sealing surface being also crystallized, and said threads being free of added crystallization with said threads remaining as formed.

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