Polymer film producing method
AssigneeFuji Photo Film Co., Ltd.
InventorHiroshi Nakashima
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Abstract
A solution casting system has a tentering device, and produces polymer film of cellulose triacetate. Two web edge portions of the polymer film are sucked within a section from a downstream end of the tentering device to a first roller that the polymer film contacts first. Furthermore, the two web edge portions are subjected to blowing of gas, or suction, between the first roller and a second roller positioned next downstream from the first roller. Each range of two web edge portions has an effective size in a web width direction less than 25% of that of the polymer film.
Claims12
A polymer film producing method of producing polymer film by use of a solution casting system including a tentering device, comprising a step of:
- blowing gas in, or sucking, a film surface of at least one of web edge portions of said polymer film within a section from a downstream end of said tentering device to a first roller that said polymer film contacts first.
Dependencies are inferred from the claim text.