Method of making poly(ethylene terephthalate) articles

Details Method of making poly(ethylene terephthalate) articles Method of making poly(ethylene terephthalate) articles

1984-10-12

1986-04-15

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264522, 264549, 264550, 264553, 264554, B29C 5106

Patent

active

045826650

ABSTRACT:
Disclosed is a process of making an oriented and heat set thermoformed hollow article of poly(ethylene terephthalate) so that the sidewalls of the articles resulting from the process have a density over 1.391 cc./gm. and an onset-of-shrinkage temperature over 105.degree. C. In the process, a sheet preheated to a temperature suitable for orientation is biaxially stretch thermoformed and then while the hollow article walls are still in contact with the mold walls, the article is raised to a higher heat setting temperature in the range of about 220-250.degree. C. thus heat setting the article, and while the article is still under restraint resisting shrinkage, quenching the sidewalls of the article to a temperature that will provide a shrinkage of less than about 5% by volume and the above onset-of-shrinkage temperature of at least about 105.degree. C.

REFERENCES:
patent: 4385089 (1983-05-01), Bonnebat et al.
patent: 4388356 (1983-06-01), Hrivnak et al.
patent: 4512948 (1985-04-01), Jabarin

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