Patent ID: 6217959
Filing Date: 2001-04-17
Classification: B29B,B29C,B29K,B29L,B65D,Y10T

Abstract:
A multi-layered plastic preform for manufacturing a blow molded container, comprising:a plastic inner liner having a thickness from 0.010-0.030 mils and having a cylindrical walled lower body portion and a cylindrical walled upper portion integral with and extending upwardly from said lower portion, wherein at least a portion of said upper portion of the plastic inner liner is crystallized by a heat treatment process; andan injection molded outer layer that is continuous with substantially the entire length of the plastic inner liner,wherein said preform has a closed bottom and an open neck and wherein the inner liner is crystallized separately from and prior to injection molding of the outer layer while protecting the lower portion of the inner liner from the heat treatment process.