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US 2008/0075922 A1Published application
Method and apparatus for producing cellulose resin film, and cellulose resin film and functional film
AssigneeFUJIFILM Corporation
InventorTadashi Ueda
Life of this patent
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Abstract
According to an aspect of the present invention, in the extruder, the mixing section in which kneading with a high shear force is conducted is disposed within a range where the molten resin does not generate excessive heat, and hence the cellulose resin can be sufficiently melt-kneaded without generating excessive heat, and thus a cellulose resin film being uniform and having excellent optical properties can be obtained.
Claims24
A method for producing a cellulose resin film, comprising the steps of:
- melting a cellulose resin with an extruder having, in a midway section of a single screw of the extruder, a compression section that kneads and compresses the cellulose resin;
- discharging the molten resin from the extruder to be fed into a die;
- and
- extruding the molten resin from the die in a form of a sheet so as to be solidified by cooling, wherein
- a mixing section equipped with a mixing element satisfying the following conditions (A) and (B) is formed at the leading end of the single screw;
- and
- the molten resin that has been kneaded and compressed in the compression section is kneaded again in the mixing section:
- (A) the clearance between the leading end of the mixing element and the inner wall surface of the cylinder of the extruder is 2 mm or less, and
- (B) the length of the mixing section, along the extrusion direction is 1D or more and 3D or less wherein D represents the inner diameter of the cylinder.
6 more elements
An apparatus for producing a cellulose resin film by:
- melting a cellulose resin with an extruder having, in a midway section of a single screw of the extruder, a compression section that kneads and compresses the cellulose resin;
- discharging the molten resin from the extruder to be fed into a die;
- and
- extruding the molten resin from the die in a form of a sheet so as to be solidified by cooling, wherein
- the extruder comprises a mixing section equipped with a mixing element satisfying the following conditions (A) and (B) at the leading end of the single screw:
- (A) the clearance between the leading end of the mixing element and the inner wall surface of the cylinder of the extruder is 2 mm or less, and
- (B) the length of the mixing section, along the extrusion direction is 1D or more and 3D or less wherein D represents the inner diameter of the cylinder.
4 more elements
Dependencies are inferred from the claim text.