Method of molding large containers by the process of stretch...

Details Method of molding large containers by the process of stretch... Method of molding large containers by the process of stretch...

B - Operations, Transporting

29

C

B29C 49/06 (2006.01) B29C 49/16 (2006.01) B29C 49/18 (2006.01) B29C 33/02 (2006.01) B29C 35/02 (2006.01) B29C 49/12 (2006.01)

Patent

CA 2159042

There is provided a method of molding a large container including the steps of preparing a preform from an injection-molded, thick-wall closed-end parison by repeatedly and intermittently applying an air blow pressure to the parison and releasing the air blow pressure therefrom, and stretch blow molding the preform to a thin-wall large container. The closed-end parison is released from a mold immediately after a skin layer keeping a parison shape is formed on the surface of the closed-end parison having a high inner temperature, and is then molded to a preform with a preform mold heated to a predetermined temperature, while the surface temperature of the parison is increased by the inner temperature. The preform kept at a stretch blow molding temperature is stretch blow molded into a blow mold to produce a large container.

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