Method of manufacturing a polarizing plate, and a cutting mat used in the method

A manufacturing method and polarizing plate technology, applied in the direction of optics, optical elements, polarizing elements, etc., can solve problems such as adhesion to polarizing plates, and achieve the effects of reducing sinking, suppressing warping, and high elastic rate

Inactive Publication Date: 2008-01-09
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, debris from the hole opening and paper dust from paper, like fibers from non-woven fabrics, will adhere to the polarizer and cause problems

Method used

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  • Method of manufacturing a polarizing plate, and a cutting mat used in the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare an ultra-high molecular weight polyethylene resin porous sheet (Nitto Denko "sun map"; viscosity average molecular weight 6 million, compression elastic modulus 250kgf / cm 2 , average pore diameter of 17 μm, thickness of 0.3 mm, Shore hardness of 48, and coefficient of dynamic friction of 0.08) as a cutting mat, and a four-layer polarizing original plate was fixed on the porous sheet. The original polarizer is fixed by attracting the original polarizer through the porous sheet from below the porous sheet.

[0034] Next, a guillotine blade (single-piece blade) with a tip angle of 25 degrees was moved from above to below the polarizing original plate at a speed of 50 mm / sec to cut the polarizing original plate. At this time, the guillotine blade was moved so that its tip reached a depth of 0.1 mm from the surface of the porous sheet. This operation was repeated so that the cutting lines on the polarizing original plate were parallel to each other and at equal inte...

Embodiment 2

[0037] The pores of the same ultrahigh molecular weight polyethylene resin porous sheet used in Example 1 were impregnated with an ultraviolet curable ink (Dainippon Ink Chemicals Co., Ltd. "Daiku ink (Daikyuaiink)") , and irradiated with an ultraviolet lamp to cure the ultraviolet curable ink, an ink-impregnated porous sheet was obtained. Ten polarizing plates were obtained in the same manner as in Example 1, except that the porous sheet was impregnated with this ink as a cutting mat. Furthermore, in the same manner as in Example 1, the maximum crack depth generated on the cut surface of the polarizing plate, the cutting dimension error, and the appearance were evaluated. The results are shown in Table 1.

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Abstract

A method of manufacturing a polarizing plate in which an original polarizing plate is cut accurately, cracks are not extended easily in a section and foreign substances are not attached easily on a polarizing plate to be obtained, and a cutting mat to be used in the method are provided. An original polarizing plate having a plurality of layers is fixed on a first principal surface of an ultrahigh molecular weight polyethylene porous sheet by drawing from the opposite side. The original polarizing plate is cut by a blade moving across the thickness of the original polarizing plate by using the porous sheet as a cutting mat to obtain a polarizing plate having a plurality of layers. A curable liquid, such as ultraviolet curable ink, is impregnated in vacant pores of the porous sheet, and is cured to obtain a sheet. The sheet thus obtained is particularly suitable for a cutting mat.

Description

technical field [0001] The present invention relates to a method for producing a polarizing plate by cutting a polarizing original plate composed of multiple layers, and to a cutting mat used in the method. In addition, in this specification, in order to distinguish the polarizing plate before cutting from the polarizing plate after cutting, it is called a polarizing original plate. Background technique [0002] Polarizing plates incorporated in liquid crystal display devices are sometimes produced by cutting an original polarizing plate into a predetermined size depending on the size. In order to add various functions, the original polarizing plate and the polarizing plate are usually composed of multiple layers. Cutting based on the rotating blade is not suitable for cutting polarized original plates due to the need for cutting amount, difficulty in ensuring dimensional accuracy, and easy adhesion of debris to products due to static electricity. Therefore, the polarizing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/1333
CPCB26D7/20G02B5/3025G02B5/30B26D1/00
Inventor 森山顺一
Owner NITTO DENKO CORP
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