Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means
Patent
1993-10-12
1995-08-29
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With heating or cooling means
264521, 264529, B29C 4964
Patent
active
054455154
ABSTRACT:
A heat-resistant container forming method includes a step of thermally shrinking a primary blow molded article in a heating furnace before secondary blow molding the primary blow molded article into a final product or container. Into the furnace, hot air which flows along the longitudinal direction of the first blow molded article and whose temperature enough to facilitate crystallization of the primary blow molded article. The primary blow molded article is thermally shrunk by exposing the entire circumferential surface of a barrel of the primary blow article to the hot air and by blowing the hot air longitudinally along the primary blow molded article to heat the barrel circumferentially uniformly. Since hot air touches the barrel as flowing longitudinally thereof, it is possible to increase the heat conductivity of boundary film of the primary blow molded article, without increasing the hot air temperature too high, so that temperature rise of the primary blow molded article is facilitated.
REFERENCES:
patent: 4729732 (1988-03-01), Schad et al.
patent: 5338181 (1994-08-01), Denis et al.
Amari Fumiya
Orimoto Hiroyuki
Suzuki Saburo
Yokota Katsumasa
Heitbrink Tim
Nissei ASB Machine Co. Ltd.
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