Rubbing method and method and apparatus for producing optical film
AssigneeFuji Photo Film Co., Ltd.
InventorMasumi Sakamoto
Life of this patent
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Abstract
According to the rubbing method of the present invention, since the support is pressed against the rubbing roller by applying fluid pressure to the backside of the support (web), uniform rubbing can be performed without generating wrinkles on the web. In other words, because the web is pressed by fluid pressure, the web follows the rubbing roller, and the orientation film on the surface of the web can be controlled to the optimal condition upon rubbing treatment without generating wrinkles on the web. With this, defects on the surface caused by poor orientation can be significantly reduced.
Claims17
A rubbing method for performing rubbing treatment on a surface of a belt-shaped flexible support by winding the support around a rotating rubbing roller while continuously transferring the support, the rubbing method comprising:
- pressing the support against the rubbing roller by applying a fluid pressure to a backside of the support.
An apparatus for producing an optical film, comprising:
- a support transfer device which continuously transfers a belt-shaped flexible support;
- a rubbing device which performs rubbing treatment while a surface of the support is put over a rotating rubbing roller, the rubbing device being equipped with a pressing device which applies a fluid pressure to the backside of the support, thereby pressing the support against the rubbing roller;
- and
- a coating device which applies a coating solution to the surface of the support after the rubbing treatment.
Dependencies are inferred from the claim text.