Method of forming a container having a low crystallinity

Details Method of forming a container having a low crystallinity Method of forming a container having a low crystallinity

1992-07-07

1994-01-25

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264520, 264530, 425526, 425530, B29C 4918, B29C 4912, B29C 4964

Patent

active

052813878

ABSTRACT:
A plastic container, particularly suited for returnable and refillable PET carbonated beverage bottles, having an enhanced level of crystallinity in the sidewall but maintaining a very low level of crystallinity in the base. The container can withstand higher caustic wash temperatures and exhibits reduced flavor carryover from one product to another. The container is formed from a preform, wherein a sidewall-forming section of the preform is initially expanded and then heated to contract and crystallize the same before being reexpanded, and a base-forming portion of the preform is shielded from the heat treatment and expanded either before or after the heat treatment.

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