B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/522
B29C 49/08 (2006.01) B29C 47/00 (2006.01) B29C 47/86 (2006.01) B29C 47/92 (2006.01) B29C 49/04 (2006.01) B29C 49/18 (2006.01) B29C 55/28 (2006.01)
Patent
CA 1333001
The present invention relates to a method of and an apparatus for manufacturing biaxially oriented film. A tubular original film which has been extruded by an extruding die is biaxially oriented by heat and air injected to the inside portion thereof being conveyed to nip rolls each having an individual circumferential speed. The temperature of heat to be applied to the film is controlled on the basis of the detected film thickness for the purpose of obtaining a uniform film thickness distribution. Furthermore, the film can be made uniform by adjusting the outer diameter of the bubble-shaped oriented film by adjusting the distance between two sets of nip rolls on the basis of the measured width of the film. In addition, when the thus-oriented film is subjected to a heat treatment, temperature of heat is arranged to be a predetermined temperature as to prevent adhesion of the films.
595210
Iwai Teruyuki
Masuoka Masato
Ohki Yuichi
Sasaki Yoshinori
Takai Yasuo
Borden Ladner Gervais Llp
Idemitsu Petrochemical Co. Ltd.
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