Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Differential temperature conditioning
Patent
1988-05-18
1989-10-03
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Differential temperature conditioning
264528, 264529, 264530, 425526, B29C 4918, B29C 4948, B29C 4964, B29C 4966
Patent
active
048715077
ABSTRACT:
A method and apparatus of forming a hollow partially crystalline heat set biaxially oriented polyethylene terephthalate container having a hemispherical base comprising blowing a heated parison at orientation temperature outwardly against the confines of a mold which is at heat setting temperature wherein the side wall and the major portion of the base of the container are subjected to a heat setting temperature and the center of the base of the container is subjected to a temperature not greater than 150.degree. C. so that the central portion is crystallized a substantially lesser amount than the side wall and the major portion of the base. The container is then quenched. The resultant container can be formed at a rapid cycle and has good drop impact properties and obviates the problems of sticking to the hot mold or blow out when the hot mold is opened.
REFERENCES:
patent: 4233022 (1980-11-01), Brady et al.
patent: 4385089 (1983-05-01), Bonnebat
McCarthy Neil M.
Owens-Illinois Plastic Products Inc.
Silbaugh Jan H.
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