Method and device for solution filming

Abstract

The invention provides a method and device for solution filming. A belt (91) moves toward the long-edge direction in a cycling manner via the rotation of a roller (131). A distance sensor (180) senses the space Cx with a belt (91). After a control portion (198) reads the space Cx from the distance sensor (180), the control portion (198) calculates the floating amount CL between the belt (91) and the roller (131) in the width direction from the read space Cx. The control portion (198) determines the stream in the width direction along the boundary position Pr of the district A1 according to the floating amount CL. The length of the outflux (131a) in the width direction is adjusted according to the boundary position Pr. The curtain coating die, adjusted by the length L0 of the outflux (131a), flows concentrated liquid toward the belt (91).

Description

technical field [0001] The invention relates to a solution film forming method and solution film forming equipment. Background technique [0002] Along with the enlargement of the screen of a liquid crystal display (LCD), the optical film used for an LCD is also required to enlarge the area. After the optical film is manufactured into a long shape, it is cut into a predetermined size according to the size of the LCD. Therefore, in order to manufacture an optical film having a larger area, it is necessary to manufacture an elongated optical film having a wider width than conventional ones. [0003] As a typical production method of elongated optical films, there is a solution film-forming method in a continuous system. As is well known, in a continuous method of solution film production, a dope in which a polymer is dissolved in a solvent is cast on a moving casting support, and a casting film composed of the dope is formed on the casting support. In this method, a film is...

AI Technical Summary

Problems solved by technology

If the state where the belt end is partially in contact with the peripheral surface of the drive roller continues, the deformation of the side portion of the belt will increase, so the above-mentioned problem caused by uneven thickness is likely to occur.

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