Process of injection stretch blow molding hollow article having

Details Process of injection stretch blow molding hollow article having Process of injection stretch blow molding hollow article having

1992-04-23

1994-03-01

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264528, 264529, 264532, 425526, 425529, B29C 4912, B29C 4964

Patent

active

052905063

ABSTRACT:
An injection stretch blow molding process forms a hollow article having a thick-walled bottom wall by regulating the bottom region of an injection molded preform to a temperature lower than that of a barrel preform portion at a blow molding station. In the process, a bulged portion formed on the distal end of a stretching rod and regulated in temperature is brought into contact with the inner bottom and adjacent side walls of the preform which correspond to the bottom region of the hollow article to be formed into an increased wall thickness, before start of a biaxially stretch blow molding step wherein the preform having a potential heat provided in the injection molding step is biaxially stretched to form the hollow article. The region of the preform contacting the bulged end portion has a temperature lower than another region of the preform non-contacting the bulged end portion.

REFERENCES:
patent: 4020137 (1977-04-01), Lachner et al.
patent: 4199629 (1980-04-01), Agrawal et al.
patent: 4422843 (1983-12-01), Aoki
patent: 4473515 (1984-09-01), Ryder
patent: 4615667 (1986-10-01), Roy
patent: 4780257 (1988-10-01), Beck
Patent Abstracts of Japan, vol. 10, No. 21, Jan. 28, 1986.
Patent Abstracts of Japan, vol. 6, No. 213, Oct. 26, 1982.
Patent Abstracts of Japan, vol. 7, No. 145, Jun. 24, 1983.

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