Method of forming container with high-crystallinity sidewall and

Details Method of forming container with high-crystallinity sidewall and Method of forming container with high-crystallinity sidewall and

1993-06-30

1996-05-28

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264530, 264906, 425526, B29C 4918, B29C 4964

Patent

active

055208770

ABSTRACT:
A method of making a polyester container having an enhanced level of crystallinity in the sidewall while maintaining a low level of crystallinity in a thickened base portion. The container is particularly useful as a refillable container which can withstand higher caustic wash temperatures and exhibits reduced flavor carryover, or as a hot-fill container. According to the method, a sidewall-forming section of a preform is initially expanded, heated to contract and crystallize the same, and than reexpanded; a base-forming portion of the preform is shielded from the heat treatment and is expanded either before or after the heat treatment step.

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