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Title:
PRODUCTION METHOD FOR STRETCHED FILM
Document Type and Number:
WIPO Patent Application WO/2016/203909
Kind Code:
A1
Abstract:
Provided is a stretched film production method including: a step in which a long polyvinyl alcohol-based resin film is continuously guided into a humidifying device and a humidified film is obtained; and a step in which the humidified film discharged from the humidifying device is dry-stretched and a stretched film is obtained. The step in which the humidified film is obtained includes a step in which the water content of the humidified film is adjusted by changing the length of the path inside the humidification device along which the polyvinyl alcohol-based resin film is conveyed.

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Inventors:
FURUYA TSUTOMU (JP)
MUTO KIYOSHI (JP)
Application Number:
PCT/JP2016/065260
Publication Date:
December 22, 2016
Filing Date:
May 24, 2016
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
B29C55/02; B29K29/00; B29L7/00; B29L11/00; G02B5/30
Foreign References:
JP2004160846A2004-06-10
JP2015092214A2015-05-14
JP2013071314A2013-04-22
JP2009276652A2009-11-26
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
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