Poly(ethylene terephthalate) articles and method

Details Poly(ethylene terephthalate) articles and method Poly(ethylene terephthalate) articles and method

B - Operations, Transporting

29

C

18/538, 190/26.1

B29C 49/64 (2006.01) B29C 71/02 (2006.01) B29C 49/06 (2006.01)

Patent

CA 1197961

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°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 200-250°C. (except for the neck) thus heat setting the bottle, and while the article is still at shrinkage resisting pressure exceeding atmospheric cooling the article to a temperature at which it maintains its shape when not pressurized but not below 100°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°C., even down to room temperature and lower, before the shrinkage resisting pressure is released from the hollow article. -31-

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