End mill for cutting optical film and method for manufacturing optical film using same

A technology of optical film and manufacturing method, which is applied in the direction of milling cutters, manufacturing tools, milling machine equipment, etc., to achieve the effect of suppressing burrs

Pending Publication Date: 2022-07-22
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the cutting process using such cutting tools, preventing or suppressing burrs (cutting defects or cutting residues) is a continuous problem.

Method used

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  • End mill for cutting optical film and method for manufacturing optical film using same
  • End mill for cutting optical film and method for manufacturing optical film using same
  • End mill for cutting optical film and method for manufacturing optical film using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. In addition, the evaluation items in the examples are as follows.

[0057](1) Burr

[0058] The cross-section of the workpiece|work (polarizing plate with an adhesive layer attached) obtained in the Example and the comparative example was photographed with a camera. Image analysis was performed on the captured data, the area of ​​the portion corresponding to the burr was calculated, and the evaluation was performed according to the following criteria. Specifically, (i) the captured image is digitized in grayscale (black 0 to white 255), (ii) objects with a brightness of 100 or more and spanning four or more adjacent pixels, and objects with a brightness of 150 or more and Objects spanning 2 to 3 pixels or more adjacent to each other are identified as glitches, and (iii) the glitches are quantified by the sum of the areas (nu...

manufacture example 1

[0062] Production of a polarizing plate with an adhesive layer

[0063] As the polarizer, a long polyvinyl alcohol (PVA)-based resin film containing iodine and uniaxially stretched in the longitudinal direction (MD direction) was used (thickness: 12 μm). An optical functional film (COP film with an antistatic layer) was bonded to one side of the polarizer. In addition, the COP film with an antistatic layer is a film in which an antistatic layer (5 μm) is formed on a cycloolefin (COP) film (25 μm), and the COP film is bonded so that it is on the polarizer side. A surface protection film was bonded to the antistatic layer side of the obtained laminate of polarizer / COP film / antistatic layer. On the other hand, a retardation film (manufactured by Zeon Corporation, Japan, trade name "ZB-12", in-plane retardation Re(550)=50 nm, thickness of 40 μm). Furthermore, a pressure-sensitive adhesive layer (thickness: 20 μm) was formed on the outer side of the retardation film, and a sepa...

Embodiment 1

[0065] The polarizing plate with the pressure-sensitive adhesive layer obtained in Production Example 1 was punched out to a size of 5.7 inches (about 140 mm in length and 65 mm in width), and the punched polarizing plates were stacked to form a workpiece (total thickness of about 20 mm). . Polystyrene (PS) sheets were placed on both sides of the obtained workpiece as spacers, and in the state of being held by clamps (jigs), by cutting using an end mill, 4 parts of the outer periphery of the workpiece were cut. A chamfered portion was formed at each corner portion, and a concave portion was formed at the center portion of one of the four outer peripheral surfaces, thereby obtaining the following Figure 7 Non-linear processed polarizer with adhesive layer shown. Here, the number of edges of the end mill is two, the helix angle is 0°, and the outer diameter is 5mm. In addition, the feed speed of the end mill was 1200 mm / min, and the rotation speed was 15000 rpm. Furthermore,...

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Abstract

The present invention provides an end mill capable of suppressing burrs during cutting of an optical thin film. This end mill for cutting an optical thin film is provided with a main body that rotates about a rotation axis, and n cutting blades that protrude from the main body and constitute the outermost diameter, and satisfies any one of the following conditions (1)-(3): (1) n is 1; (2) n is 2 or more, and the maximum value of the difference between the cutting edge lengths of all the cutting edges is 0.12% or less with respect to the reference cutting edge length; or (3) n is 2 or more, and the minimum value of the difference between the edge length of the longest cutting edge and the edge length of the other cutting edges is 0.60% or more with respect to the reference edge length.

Description

technical field [0001] The present invention relates to an end mill for cutting optical films and a method for producing an optical film using the end mill. Background technique [0002] A technique of cutting the end face of an optical film (eg, polarizing plate) is known. As for such cutting, typically a plurality of optical films are stacked to form a workpiece, and the outer peripheral surface of the workpiece is cut. In such cutting work, a cutting tool having a plurality of cutting edges is sometimes used. However, in the cutting process using such a cutting tool, preventing or suppressing burrs (defective cutting or cutting residues) is a persistent problem. [0003] prior art literature [0004] Patent Literature [0005] Patent Document 1: Japanese Patent Laid-Open No. 2016-182658 SUMMARY OF THE INVENTION [0006] Invention to solve problem [0007] The present invention has been made in order to solve the above-mentioned conventional problems, and its main ...

Claims

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Application Information

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IPC IPC(8): B23C5/10B23C3/12G02B5/30
CPCB23C3/12G02B5/30B23C5/10B23C5/1009
Inventor 土永诚永谷勇人中市诚
Owner NITTO DENKO CORP
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