POLYESTER FILM, METHOD FOR PRODUCING THE SAME, BACK SHEET FOR SOLAR CELLS, AND SOLAR CELL MODULE
First Claim
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1. A method for producing a polyester film, the method comprising:
- subjecting a polyester raw material resin, which contains a titanium compound as a polymerization catalyst and has an intrinsic viscosity of from 0.71 to 1.00, to melt extrusion using a twin-screw extruder which includes a cylinder;
two screws disposed inside the cylinder; and
a kneading disk unit disposed in at least a portion of a region extending from a 10%-position to a 65%-position of screw length with respect to an upstream end of the screws in a resin extrusion direction as a starting point, at a maximum shear rate (γ
) generated inside the twin-screw extruder of from 10 sec−
1 to 2000 sec−
1;
forming an unstretched film by cooling and solidifying the melt extruded polyester resin on a cast roll;
subjecting the unstretched film to biaxial stretching in a longitudinal direction and a lateral direction; and
heat fixing the stretched film formed by biaxial stretching.
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Abstract
Provided is a method for producing a polyester film, including: subjecting a polyester raw material resin, which contains a titanium compound and has an intrinsic viscosity of from 0.71 to 1.00, to melt extrusion using a twin-screw extruder which includes a cylinder; two screws disposed inside the cylinder; and a kneading disk unit disposed in at least a portion of a region extending from a 10%-position to a 65%-position of screw length with respect to an upstream end of the screws in a resin extrusion direction as a starting point, at a maximum shear rate generated inside the twin-screw extruder of from 10 sec−1 to 2000 sec−1;
- forming an unstretched film by cooling and solidifying the melt extruded polyester resin on a cast roll; subjecting the unstretched film to biaxial stretching in a longitudinal direction and a lateral direction; and heat fixing the stretched film formed by biaxial stretching.
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Citations
15 Claims
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1. A method for producing a polyester film, the method comprising:
-
subjecting a polyester raw material resin, which contains a titanium compound as a polymerization catalyst and has an intrinsic viscosity of from 0.71 to 1.00, to melt extrusion using a twin-screw extruder which includes a cylinder;
two screws disposed inside the cylinder; and
a kneading disk unit disposed in at least a portion of a region extending from a 10%-position to a 65%-position of screw length with respect to an upstream end of the screws in a resin extrusion direction as a starting point, at a maximum shear rate (γ
) generated inside the twin-screw extruder of from 10 sec−
1 to 2000 sec−
1;forming an unstretched film by cooling and solidifying the melt extruded polyester resin on a cast roll; subjecting the unstretched film to biaxial stretching in a longitudinal direction and a lateral direction; and heat fixing the stretched film formed by biaxial stretching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification