Method of preforming heat treatment on a wound roll film

Details Method of preforming heat treatment on a wound roll film Method of preforming heat treatment on a wound roll film

1994-12-28

1997-06-03

Bennett, Henry A.

Heating

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

2425484, 242520, 430501, G03C 176

Patent

active

056347898

ABSTRACT:
Knurling is applied to both side edge portions of a high-molecular film and then the film is wound up. A packing agent is applied to the knurled portions to enclose air at the time of winding in spaces between wound film layers and the film is put into an annealing isothermal chamber while contact between the wound film layers is prevented by the air. Preferably, the high-molecular film is made to pass through a heating zone just before the winding so that the high-molecular film after heated is wound up. More preferably, the winding core used for winding is a hollow porous winding core and high-temperature pressurized air is blown out onto the film through the hollow porous cylindrical surface. In a method of performing heat treatment on a wound roll film in which annealing treatment is performed on a roll film obtained by winding a high-molecular film, comprising the steps of: enclosing a winding portion of a device in a box; keeping the inside of the box at a high temperature equal to that of an annealing chamber; heating the high-molecular film to a temperature equal to the temperature of the inside of the box just before winding and then winding the high-molecular film; and conveying the high-molecular film into an isothermal chamber for annealing treatment.

REFERENCES:
patent: 3900590 (1975-08-01), Dhoble
patent: 5026276 (1991-06-01), Hirabayashi et al.
patent: 5114337 (1992-05-01), Yamazaki
patent: 5171145 (1992-12-01), Kusaka et al.
patent: 5184952 (1993-02-01), Nishikura et al.

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