Method for injection stretch blow molding
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United States of America Patent
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Sep 20, 2011
Grant Date -
Dec 28, 2006
app pub date -
Jun 12, 2006
filing date -
Jun 13, 2005
priority date (Note) -
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Abstract
In the hot parison method of stretch blow molding, the temperature distribution of the body wall of the injection molded preform is changed to a gentle gradient slope shape from a mountain shape not by the external application of heat, but by the preform itself, to prepare a bottle with an improved top load value. After the injection-molded preform is released from the mold, cooling of the inner side of the preform is continued by the injection core. Inner side cooling is terminated by release from the injection core. The preform is left in a hollow state for a time, the temperature-averaging time, until the outer surface temperature drops to the stretch blow molding temperature, after passing a peak temperature. While in the molding temperature region, stretch blow molding of the thin-wall hollow molded article is conducted.
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