B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/28 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01)
Patent
CA 2100431
A method and apparatus for molding an inflation film even from a thermoplastic resin having a small melt tension, in which a melt resin bubble extruded from an extruder is molded, while controlling a resin temperature of the bubble to a certain temperature range by an air ring provided with a plurality of annular slits for blowing cooling air in a take-up direction of the melt resin bubble and provided at a position at which the melt resin bubble is remarkably expanded, after (a) cooling air is blown to a melt resin bubble from a first air ring provided at the proximity of a die outlet to cool said melt resin bubble; and, then, the bubble is either (i) brought into contact, on the inner surface thereof, with the surface of a stabilizer provided on a die surface, or (ii) is supported in a non-contact state through an air layer, while being taken up; or (b) the melt resin bubble is brought into contact, on the inner surface thereof, with a stabilizer, while being taken up.
Hatano Hisashi
Kobayashi Tomoaki
Kotani Terumitu
Onoda Takeshi
Taka Toshio
Ridout & Maybee Llp
Showa Denko K.k.
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