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Method for bonding polymer film and method for producing polarizing film

A technology of polymer film and bonding method, which is applied in the field of bonding of polymer films and manufacturing of polarizing films, and can solve problems such as air bubbles mixing into welded parts

Inactive Publication Date: 2013-02-27
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In this way, the joint using a heat sealer can form a high-quality joint compared with adhesive joints, seam joints, etc., but the joint using a heat sealer is prone to air bubbles and the like being mixed into the welded part because the joint is heated in a wide range. room for improvement

Method used

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  • Method for bonding polymer film and method for producing polarizing film
  • Method for bonding polymer film and method for producing polarizing film
  • Method for bonding polymer film and method for producing polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0222] The water absorption rate of the lower PVA film among the two overlapping PVA films is 18%, and the maximum light absorption rate of the laser irradiation part in the wavelength range of 1.9 to 2.2 μm is 22%, and the laser is carried out under the above conditions. join.

[0223] As a result, good adhesiveness was confirmed without using a special light absorber.

[0224] The tensile breaking strength of the obtained bonded body was good at 100 N / 30 mm width (tensile speed: 50 mm / min, tensile testing machine).

[0225] Further, when the bonded body was immersed in water at 30° C. for 1 minute, no foreign matter was eluted in water.

Embodiment 2）

[0227] Under the same conditions as in Example 1, two PVA films serving as raw films were connected by bonding. Put the PVA film thus connected in such as figure 1 In the stretching device shown, the stretching ratio is 2.6 times in the swelling bath, 3.4 times in the dyeing bath, 3.6 times in the crosslinking bath, and 6.0 times in the stretching bath. Transform transport, and then through the cleaning bath, so as to manufacture polarizing film. As a result, the polarizing film can be continuously produced without breaking the connecting portion.

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Abstract

The purpose is to achieve excellent bonding of a polymer film, such as a polyvinyl alcohol-based resin film, while controlling the use of a light absorbing agent. Provided are a method for bonding a polymer film which comprises face-contacting the surface of the polymer film with the surface of an adherend and laser welding the interface, characterized in that the laser beam is irradiated to the polymer film, which is in the water-absorbed state at least in the interface side thereof, and the thus absorbed water is allowed to absorb the laser beam to thereby achieve the laser welding, and so on.

Description

technical field [0001] The present invention relates to a bonding method of a polymer film in which the surface of a polymer film is brought into surface-to-face contact with the surface of an object material to be bonded, and the interface is laser welded, and a method of joining two or more polyvinyl alcohol-based resin films. A method for producing a polarizing film in which a raw film is dipped in a reagent solution to produce a polarizing film. Background technique [0002] Conventionally, a polyvinyl alcohol-based resin (PVA) film is known as a polymer film exhibiting high water absorption, and this polyvinyl alcohol-based resin film is used as a raw material of a polarizing film and the like. [0003] High-quality polarizing films are used in image display devices such as liquid crystal display devices. In the production method of such a polarizing film, various treatments are applied by absorbing water and swelling the polyvinyl alcohol-based resin film. [0004] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/16G02B5/30B29K29/00B29L11/00
CPCB65H21/00B29C65/168B29C66/7338B29C65/1635B29C65/16B29C65/1683B29C65/1677B29C66/919B29C66/91431B29C65/1654B29C66/929B29C66/028B29C66/71B65H2301/5161B29C66/1122B29C66/9141B29C66/43B29C66/7352B29C66/91645B29C65/1667B29C65/1403B65H19/1852B65H2557/51B29C65/1616B65H2701/1752B29L2011/00B29C66/81267B29C66/73171B29C65/8215G02B5/30B29C66/9161B29C66/73753B29C66/8322B29C66/7392B29C66/73921B29C66/8122B29K2995/0027B29K2029/04B29K2909/08B29C65/80B29D7/01
Inventor 松尾直之下田麻由
Owner NITTO DENKO CORP
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