Device for manufacturing optical film

摘要

Provided is a device for manufacturing an optical film having satisfactorily reduced thickness unevenness, by using a melt-casting film forming method, which device includes a casting die for discharging a molten film-forming material including a thermoplastic resin into a film-like shape; a pair of a first rotation roll and a second rotation roll between which the discharged film-shaped molten article is pinched to be cooled and solidified to make the film-shaped molten article; and two pairs of wind shield plates each of which pairs are arranged between the shaft-direction ends of the first and second rotation rolls and an end part in the width-direction of the film-shaped molten article, wherein the wind shield plates are placed approximately perpendicular to the surface of the film-shaped molten article, and wherein each pair of the wind shield plates are placed approximately in parallel.

主权项

1. A device for manufacturing an optical film comprising:
a flow casting die configured to discharge in a film state a molten film-constituting-material containing a thermoplastic resin to form a film-shaped molten article; a pair of rotation rolls configured to cool and solidify the film-shaped molten article by pinching the molten film-shaped article therebetween; and a pair of wind shield members, each of the wind shield members is provided between a respective end of the rotation rolls in an axial direction of the rotation rolls and the film-shaped molten article, the each of the wind shield members including: a first wind shield plate; and a second wind shield plate provided on an outer side of the first wind shield plate in the axial direction, the first wind shield plate and the second wind shield plate being approximately perpendicular to a surface of the film-shaped molten article and approximately parallel to each other.