Stretched film manufacturing method and film stretching equipment
A manufacturing method and stretching equipment technology, which can be applied to flat products, instruments, household appliances, etc., and can solve problems such as scratches and wrinkles on the surface of the film
Inactive Publication Date: 2017-10-03
FUJIFILM CORP
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Problems solved by technology
When such a thinned thermoplastic resin film is stretched longitudinally, as in Japanese Patent Laid-Open No. 2007-54683 and Japanese Patent Laid-Open No. 2011-207168, both the preheating method based on the preheating roll and the rapid cooling method of the thermoplastic resin film There are limitations, scratches or wrinkles occur on the surface of the film, and improvement is required
Method used
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Embodiment
[0063] As the film 15, a cellulose acylate film was used and preheated, longitudinally stretched, and cooled. In the longitudinal stretching section 12, primary longitudinal stretching is performed by the upstream low-speed roller group 21 and the downstream high-speed roller group 22 . A film feeder is used as the pre-process device 9 to pull the film 15 from a film roll and then sent to the preheating unit 11, and a film winder is used as the post-process device 14 to wind the film 15 as a film roll. The experiment was carried out by changing the conditions as follows: that is, the preheating temperature was set to 130°C, the stretching temperature was set to 150°C, the longitudinal stretch ratio was set to 1.5 times, the stretching length was set to 300 mm, the cooling temperature was set to 100°C, and the film transfer The speed is set to 2m / min, the film width before stretching is set to 600mm, the film thickness before stretching is set to 100μm, and the film width after...
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Abstract
PROBLEM TO BE SOLVED: To stretch a film in a conveying direction without causing a scratch nor a corrugate-shaped wrinkle on the film.SOLUTION: In a method for manufacturing a stretched film, a film 15 is stretched in the conveying direction by making use of a roller circumferential speed difference between a low-speed roller pair 21 and a high-speed roller pair 22. The film 15 after stretching is cooled by cooling rollers 25, 26. A slitter 31 is disposed between the high-speed roller 22a and the cooling roller 25. The film 15 is cut and separated into a central portion and both side edge portions in a width direction by the slitter 31. No unevenness occurs in the film 15 on the cooling rollers 25, 26, since both the side edge portions each having large thickness are cut off. Occurence of the scratch or the wrinkle due to the unevenness is suppressed.
Description
technical field [0001] The present invention relates to a method for producing a stretched film and a film stretching device for stretching the film in a conveying direction by a difference in peripheral speed between a pair of rollers. Background technique [0002] In general, the production method of a thermoplastic resin film can be roughly classified into a solution film forming method and a melt film forming method. In the solution film forming method, after a dope in which a thermoplastic resin is dissolved in a solvent is cast from a mold onto a support such as a cooling drum and a drying belt, it is peeled off as a thermoplastic resin film. Furthermore, in the melt film forming method, after melting a thermoplastic resin with an extruder, it is extruded from a die onto a support such as a cooling roll, and then peeled off to obtain a thermoplastic resin film. [0003] Thermoplastic resin films formed by these methods, such as cellulose acylate films, generally devel...
Claims
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IPC IPC(8): B29C55/06
CPCB29C55/06B29C55/18B29D7/01G02B5/3033
Inventor 江崎俊郎
Owner FUJIFILM CORP