Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1983-02-14
1985-10-15
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264531, 425529, 425537, 425444, B29C 1707
Patent
active
045473331
ABSTRACT:
An apparatus for biaxial-blow-molding a hollow bottle-shaped container of a synthetic resin which has a bottom mold having an upper surface becoming the bottom mold surface of the bottle-shaped container and a cylinder chamber formed therein, a bottom protruding pin having an upper end face forming part of the bottom mold surface of the bottom mold and a piston portion formed at the bottom end thereof and telescopically moved back and forth in the cylinder chamber of the bottom mold, and an elastic member disposed in the cylinder chamber of the bottom mold for urging the bottom protruding pin forwardly when the member is contacted with the piston portion of the bottom protruding pin in such a manner that the tension of the member is weaker than the pressure of compressed air to be blown into the molds. This apparatus is operated by a method of biaxial-blow-molding the hollow bottle-shaped container of a synthetic resin of the invention. Thus, the bottom of the blow-molded piece or parison adhered to the bottom of the blowing mold at the time of blow-molding can be readily released from upon opening of the split molds after the piece is completely blow-molded.
REFERENCES:
patent: 3914086 (1975-10-01), Hujik
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4364721 (1982-12-01), Rainville
patent: 4457688 (1984-07-01), Calvert et al.
Silbaugh Jan
Yoshino Kogyosho Co. Ltd.
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