Methods of winding, annealing and unwinding a polymer film web,

Details Methods of winding, annealing and unwinding a polymer film web, Methods of winding, annealing and unwinding a polymer film web,

1996-03-07

1999-04-20

Walberg, Teresa

Heating

Advancing structure flexing, looping or coiling sheet, web...

430501, 264284, 264234, 264235, F27B 928

Patent

active

058952128

ABSTRACT:
A method of winding a polymer film web around a cylindrical core, where the core is heated by blowing hot-air against the core prior to winding the polymer film web, and the polymer film web is wound around the heated core while blowing hot-air against the polymer film web. In another embodiment of the winding method, the polymer film is wound while knurled along both edge parts in the width direction of the film to form knurls so as to gradually decrease in the thickness thereof from one end of the film that contacts with the core toward the other end of the film. Furthermore, a heat treating method for annealing a film roll and a heat treating apparatus therefor are disclosed, which method comprises the steps of surrounding the film roll with heat insulating panels and blowing hot-air against the film roll in the direction along the core axis while rotating the core intermittently or continuously at a rotary speed of from 0.04 to 4 revolutions per hour.

REFERENCES:
patent: 4836774 (1989-06-01), Harada et al.
patent: 5585229 (1996-12-01), Kawamoto et al.
patent: 5634789 (1997-06-01), Nawano et al.
Patent Abstracts of Japan, vol. 011, No. 347 (M-641), Nov. 13, 1987 for JP-A-62 127229 (Teijin Ltd), Jun. 9, 1987.
Patent Abstracts of Japan, vol. 013, No. 161 (M-815), Apr. 18, 1989 for JP-A-63 319126 (Teijin Ltd), Dec. 27, 1988.

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