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Manufacturing method of optical film

A manufacturing method and technology of optical film, applied in optics, nonlinear optics, instruments, etc., can solve the problem of inability to manufacture polarizer protective film optical film and so on

Active Publication Date: 2017-04-05
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the methods described in Japanese Patent Laid-Open No. 2006-205729 and Japanese Patent Laid-Open No. 2008-162289 cannot produce optical films requiring transparency such as polarizer protective films or retardation films.

Method used

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  • Manufacturing method of optical film
  • Manufacturing method of optical film
  • Manufacturing method of optical film

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Embodiment Construction

[0029] (Solution Membrane Production Equipment)

[0030] Optical film (hereinafter referred to simply as film) such as by figure 1 The solution film formation apparatus 10 shown is fabricated. The solution film forming facility 10 includes a casting device 12 , a clip tenter 13 , a drying device 15 , a cooling device 48 , and a winding device 17 .

[0031] The casting device 12 has a die unit 21 , a belt 22 , a first roll 23 , a second roll 24 , and a casting chamber 25 . The die unit 21 has a feed port 28 and a casting die 29 from which the dope 31 supplied to the feed port 28 continuously flows out. Details of the mold unit 21 will be described later using other drawings.

[0032] The belt 22 is an endless casting support formed in an endless shape, and is wound around the peripheral surfaces of the first roll 23 and the second roll 24 . The first roller 23 has a rotation shaft 23 a at the center of the circular side surface, and the rotation shaft 23 a is rotated in the...

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PUM

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Abstract

The invention provides a method for manufacturing an optical film. A flow path (70) including a first part (71) to a third part (73) is formed inside a feed head arranged upstream of the casting die. Each part ( 71 ) to ( 73 ) is composed of a division part ( 71 a ), a conversion part ( 71 b ), and a merged compression part ( 71 c ) arranged in order from the upstream side. The dope is sent to the dividing part (71a) of the first part (71), and the dope flow is divided into a plurality. The divided dope streams formed by splitting are sent to the conversion unit (71b), converted to align in the thickness direction, and then sent to the confluence compression unit (71c), where they are merged in layers and compressed in the thickness direction. This laminar dope stream is sent to the second section (72) and the third section (73), adding layers of the dope stream and compressing the thickness of each layer. The laminar dope stream is provided to be cast and dried to form a film.

Description

technical field [0001] The invention relates to a method for manufacturing an optical film. Background technique [0002] With the thinning of liquid crystal displays (LCDs), there is an increasing demand for thinning of the optical films constituting the LCD. Since the phase difference regarded as one of the optical characteristics of an optical film is expressed by the product of birefringence and thickness, it is necessary to control birefringence according to thickness. That is, it is necessary to increase the birefringence, especially the birefringence Rth in the thickness direction, in accordance with the thinning of the optical film. [0003] On the other hand, as a method for producing a film, there are a melt extrusion method and a solution film forming method. The melt extrusion method is a method of producing a film by extruding with an extruder after melting a polymer. The method has the characteristics of high productivity and low equipment cost. However, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18
CPCG02B5/30G02F1/1335
Inventor 高瀬雅典
Owner FUJIFILM CORP