Method for manufacturing film, film, laminated body, and packaging material
AssigneeAGC Inc.
InventorsYoshiaki Higuchi, Shintaro Fukunaga, Takatoshi Yaoita
Life of this patent
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Abstract
To provide a process for producing a film excellent in water vapor barrier property, tensile elongations, and transparency. A resin material containing polychlorotrifluoroethylene (PCTFE) is melted and extruded into a film from an extrusion die, the extruded product is brought into contact with a cooling roll having a surface temperature of at most 120° C. in a state such that the surface temperature of the extruded product is higher than the crystallization temperature of PCTFE to form a film web, and the film web is subjected to heat treatment at from 80 to 200° C. to obtain a film.
Claims16
A process for producing a film, comprising:
- melting a resin material containing polychlorotrifluoroethylene;
- extruding the melted resin material into a film from an extrusion die;
- bringing the extruded film into contact with a cooling roll having a surface temperature of at most 120° C. in a state that a surface temperature of the extruded film is higher than a crystallization temperature of the polychlorotrifluoroethylene to form a film web;
- and
- subjecting the film web to heat treatment at from 80 to 200° C. to obtain the film.
Dependencies are inferred from the claim text.