B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/528
B29C 49/64 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01) B29C 49/04 (2006.01) B29C 55/28 (2006.01) B29C 70/66 (2006.01) B29C 70/82 (2006.01) C08J 5/18 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)
Patent
CA 2021283
ABSTRACT OF THE DISCLOSURE An elastomer film of a thermoplastic elastomer composition comprising 30-70 weight % of an ethylene-propylene- diene copolymer and 70-30 weight % of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 5-30 weight % and a melt index of 0.2-25 g/10 minutes, the elastomer film having a thickness of 10-6 µm, and a draw ratio expressed by a heat shrinkage ratio at 50°C which is 5-35% in an MD direction and 5- 25% in a TD direction, a ratio of the draw ratio in an MD direction to the draw ratio in a TD direction being 3 or less, is produced by an air-cooled inflation method comprising the steps of (a) extruding the thermoplastic elastomer composition from an annular die at a temperature of 170°C or lower; (b) taking up a bubble of the elastomer film such that a neck portion of the bubble is 1.0-4.0 times as long as a diameter of the annular die; (c) cooling the neck portion to a temperature of 120°C or lower by a cooling air ejected from a first cooling ring disposed near the annular die; (d) drawing the bubble both in an MD direction and in a TD direction in a bubble transition portion between the neck portion and a frost line, while lowering the temperature of the bubble in the frost line to 45°C or lower; (e) cooling the bubble to a temperature of 35°C or lower by a cooling air ejected from a second cooling ring disposed above the frost line; and (f) cooling the bubble to a temperature of 30°C or lowerby a cooling air ejected from a third cooling ring disposed slightly above the second cooling ring, whereby the bubble is not subsequently drawn.
Kagawa Seiji
Toda Hideaki
Uotome Yoshihiro
Kagawa Seiji
Smart & Biggar
Toda Hideaki
Tonen Sekiyukagaku Kabushiki Kaisha
Uotome Yoshihiro
LandOfFree
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