Tenter clip and solution casting method

A technology of solution casting and stenter, which can be applied to home appliances, transportation and packaging, and other home appliances. It can solve the problems of large size, complex structure of stenter devices, and high maintenance costs, so as to prevent surface defects. Effect

Inactive Publication Date: 2008-04-23
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if a heating device or a cleaning device is provided for the tenter clip, the tenter device has a complicated structure and becomes large
Therefore, maintenance costs become high

Method used

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  • Tenter clip and solution casting method
  • Tenter clip and solution casting method
  • Tenter clip and solution casting method

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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to this embodiment.

[0029] [raw material]

[0030] As the polymer of this embodiment, cellulose acylate is preferable, and cellulose triacetate (TAC) is particularly preferable. The TAC may be made of cotton linters or cotton pulp, or a mixture of materials obtained from cotton linters or cotton pulp, respectively, and preferably the TAC is made of cotton linters. In cellulose acylate, it is preferred that the degree of acyl substitution for hydrogen atoms on hydroxyl groups of cellulose preferably satisfy all of the following formulas (I)-(III). In these formulas (I)-(III), A is the acyl substitution degree for the hydrogen atom on the hydroxyl group of cellulose, and B is the acyl substitution degree for the hydrogen atom, and each acyl group has a carbon atom, and the carbon atom Quantities from 3 to 22. It should be noted that at least 90% by weig...

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Abstract

A dope, prepared from cellulose triacetate (TAC), solvent and the like, is cast from a casting die onto a belt to form a casting film, which, thereafter, is peeled as a wet film (74) from the belt. The wet film (74) is transported to a tenter device, in which both side edge portions are clipped by tenter clips (100) and the firm is dried with stretching in the widthwise direction. The tenter clips (100) (temperature, 0 to 60 DEG C) has a support surface (100a) for supporting the side edge portion of the wet film (74) thereon. A surface tension of the support surface (100a) is in the range of 3.0 x 10-2 to 3. 3 x 10-2 N / m, a surface roughness Ra 0.05 to 1.0 m, and a surface hardness 400 to 800 Hv. Thus, the present invention results in reducing the adhesion of the foreign materials on the surface.

Description

technical field [0001] The present invention relates to a tenter clip and a solution casting method in which a tenter device including a tenter clip is used. Background technique [0002] The cellulose acylate film is formed from cellulose acylate. For example, especially cellulose triacetate (hereinafter referred to as TAC) films are formed of TAC, the average degree of acetylation of TAC is in the range of 58.0% to 62.5%. Due to its strength and flammability, TAC film is used as a base for film materials such as photosensitive materials. In addition, since the optical isotropy of the TAC film is excellent, it is used as a protective film in liquid crystal displays whose market has become large in recent years. [0003] TAC membranes are typically produced by solution casting methods, where the produced membranes are superior in physical properties (eg, optical properties and the like) compared to other membrane production methods. For the solution casting method, the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/08B29C41/28B65H23/028
CPCB29C55/20B29C55/06B29K2001/00B29D7/01B65H23/028B29C41/28B29C55/08
Inventor 新井利直池田仁小代田直也
Owner FUJIFILM CORP
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