Optical film and method of manufacturing the same

An optical film and manufacturing method technology, applied in optics, optical elements, optical elements, etc., can solve the problem of inability to obtain polarization degree, etc., and achieve the effect of preventing black belt failure or film deformation failure, and preventing roll deviation or roll loose.

Active Publication Date: 2014-09-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a black band defect occurs, when the films are peeled off, there will be a knick-like deformation and uniform polarization cannot be obtained, so it will cause problems especially when used as an optical film

Method used

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  • Optical film and method of manufacturing the same
  • Optical film and method of manufacturing the same
  • Optical film and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0090] Cellulose triacetate was dissolved in a mixed solution of methylene chloride and methanol to form a dope, and the dope was cast on a stainless steel belt to form a thin film. In the dope, in addition to cellulose triacetate as the main raw material, plasticizers such as triphenyl phosphate and biphenyl diphenyl phosphate, ultraviolet (ultraviolet, UV) absorbers, and silicon dioxide are also mixed. Department of matting agent.

[0091] After the film cast on the stainless steel belt was heat-treated and sufficiently dried, knurling processing with a width of 10 mm was given, and the winding tension was set at 300 N to wind up for 3900 m. The film width was set to 1340 mm, and the thickness was set to 25 μm.

[0092] Here, an optical film roll having a winding length of 3900 m was produced for three standards. The first is an optical film roll made with the existing film thickness, the second is an optical film roll with T(x) in the range of 100±1.6% of TM(x), and the t...

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Abstract

The present invention provides an optical film and a method of manufacturing the same, even the thin optical film is wound to be coil-shaped, deviation and loosening of the winding can be prevented, and a black belt fault or a film deformation fault can also be prevented. A target value TM(x)mm of the thickness of the film is set according to the formula as described in the specification. The manufactured film is measured along the width direction of the film every 0.5 mm, and a function made by drawing the measured values is set to be T(x)mm so as to adjust the thickness distribution in a manner of making the T(x) in 100 + / - 0.8 % of the TM(x).

Description

technical field [0001] The present invention relates to an optical film and a manufacturing method thereof, in particular to an optical film containing cellulose acetate or polyester used for a protective film of a polarizing plate and a manufacturing method thereof. Background technique [0002] An optical film used for a protective film of a polarizing plate or the like is produced by a solution film forming method or a melt film forming method. [0003] In the solution membrane method, it is produced by casting a thick solution (dope) on a moving annular (endless) support, where the dope dries to become self-supporting. After that, peel off successively and let dry. [0004] For the strip-shaped film produced as described above, for example, as shown in Patent Document 1, knurling (knurl) is applied to the side ends (ends in the width direction), and then wound into a roll to form a film Volumes are stored and transported. Knurling is a tiny unevenness, also known as e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C59/04C08J5/18G02B1/10G02B5/30
CPCG02F1/133528G02B5/30B29D11/00
Inventor 松村善仁
Owner FUJIFILM CORP
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