Patent ID: 7919021
Filing Date: 2011-04-05
Classification: B29C,B29D

Abstract:
1. A manufacturing method for an optical sheet for passing a thermoplastic resin discharged from a die between a touch roll and a shaping roll under pressure, wherein a temperature of the resin discharged from the die is in a range of 250° to 290° C.; a molding speed is in a range of 10 to 25 m/min; an air gap between the die and a nip position between the touch roll and the shaping roll is in a range of 110 mm or smaller, the touch roll comprising an elastic roll deformable in a diameter direction by 0.05% to 1.0% of a diameter under a linear pressure of 30 kg/cm; and a thickness of the optical sheet is 200 μm or less, a mold pattern pitch is 290 μm or less, a mold height is in a range of 30 to 100 μm, and a transferring rate is 90% or more.