Molding method and cooling apparatus for pressure resisting bott

Details Molding method and cooling apparatus for pressure resisting bott Molding method and cooling apparatus for pressure resisting bott

1996-08-01

1998-12-22

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264528, 264534, 425526, B29C 4966

Patent

active

058514783

ABSTRACT:
A biaxially stretched blow molded bottle of a synthetic resin having a big foot type petaloid bottom is produced in a blow time of not more than 3 seconds, and after the bottle has been released from the mold, the temperature of the bottom portion of the bottom does not rise higher than 70.degree. C., thereby supplementing the capability of the metal mold for cooling the bottom portion. Thus, irregular deformation of the central part of the bottom portion is prevented, molding of the bottom portion with high pressure resisting and mechanical strength is achieved to avoid breakage, and a sufficient height of the central part of the bottom portion is ensured. Additionally, productivity of pressure resisting bottles is improved by reducing the blow time from 4-5 seconds to not more than 3 seconds.

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