Method for blow molding hollow articles and device for the same

Details Method for blow molding hollow articles and device for the same Method for blow molding hollow articles and device for the same

B - Operations, Transporting

29

C

B29C 49/60 (2006.01)

Patent

CA 2143795

In a blow molding process, a fused thermoplastic polymer parison is interposed between a pair of split molds. The split molds are closed around the parison to seal the ends. A small diameter hollow needle is inserted through one of the split molds and fluid is blown into the parison forming a balloon. After the balloon begins to form, a large diameter hollow needle is inserted while internal pressure is applied to the parison via the small diameter hollow needle, and a large amount of fluid is blown in. If the balloon contacts the sides of the molds before fluid is blown through the large diameter hollow needle, a glossy bottle is formed. This process is highly productive and reduces the conventional blow molding cycle by 60 percent due to the rapid cooling of the hollow article.

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