Method for making poly(ethylene terephthalate) article

Details Method for making poly(ethylene terephthalate) article Method for making poly(ethylene terephthalate) article

1982-03-03

1985-04-23

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264523, 264526, 264528, 264529, 264532, B29C 1707

Patent

active

045129487

ABSTRACT:
Disclosed is a process of making an oriented and heat set blow molded bottle of poly(ethylene terephthalate) so that the bottles resulting from the process have a density over 1.3860 cc./gm. and an onset-of-shrinkage temperature over 80.degree. C. In the process preform preheated to a temperature suitable for orientation is biaxially stretched in a blow mold and then while the hollow article walls are still in contact with the blow mold walls, the article is raised to a higher heat setting temperature in the range of 200.degree.-250.degree. C. (except for the neck) thus heat setting the bottle, and while the article is still at a shrinkage resisting pressure exceeding atmospheric cooling the article to a temperature at which it maintains its shape when not pressurized but not below 100.degree. C. It is also particularly disclosed that this cooling step can be done outside the mold. In a special embodiment of the invention where the cooling step is effected outside the mold, the cooling under the shrinkage resisting pressure is below 100.degree. C., even down to room temperature and lower, before the shrinkage resisting pressure is released from the hollow article.

REFERENCES:
patent: 4385089 (1983-05-01), Bonnebat et al.

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