Title:
MANUFACTURE OF BIAXIALLY ORIENTED CRYSTALLINE NYLON FILM
Document Type and Number:
Japanese Patent JP3220432
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a biaxially oriented crystalline nylon film having no deviation of a thickness, excellent thermal fixability, and excellent printing characteristics or laminating characteristics at the time of postprocessing the film.
SOLUTION: The method for manufacturing a biaxially oriented crystalline nylon film comprises the steps of quickly cooling to solidify a melted tubular film discharged from an annular die, then reheating the film, urging the air, and biaxially orienting the simultaneously biaxially oriented film in a no tension state in an MD (moving direction of the film) and a TD (a direction perpendicular to the moving direction of the film). The method further comprises the steps of pre-heat treating the biaxially oriented film at film temperature (80 to 120°C) or higher to a temperature higher by 30°C than this or lower as needed. The method further comprises the steps of introducing the film in a tubular heat treating oven, raising the temperature of the film finally to a temperature lower by 25 to 35°C than a melting point of the crystalline resin by a far infrared radiation heating and hot air from an outside, thermally fixing it, and forcibly air cooling it.
Inventors:
Park Kageo
Park Myung-soo
Park Myung-soo
Application Number:
JP31697998A
Publication Date:
October 22, 2001
Filing Date:
October 20, 1998
Export Citation:
Assignee:
Stock company Hyosung
International Classes:
B29C71/02; B29C55/26; B29C55/28; B29D7/01; C08J5/18; B29K77/00; B29L7/00; (IPC1-7): B29C55/26; B29C71/02; C08J5/18
Domestic Patent References:
| JP5929128A | ||||
| JP2141225A |
Attorney, Agent or Firm:
Rikichi Ichikawa (1 outside)