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Abrasive cloth and grinding method thereof

A technology of abrasive cloth and composite cloth, which is applied in the field of abrasive cloth and can solve problems such as difficult industrial production

Inactive Publication Date: 2004-11-24
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to cut off a part of the woven bundle of the woven cloth so that the ultrafine fibers with a diameter of less than 2 μm become erect hairs, and it is difficult to carry out industrial production

Method used

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  • Abrasive cloth and grinding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 49.1 parts of polyethylene with a melt index of 90 measured at a temperature of 260° C., 50 parts of nylon 6 with a melt index of 18, and 0.9 parts of polyethylene glycol were mixed in a granular state. Next, the mixed pellets are fed into an extruder for spinning. The temperature of the melting part and the screw end was 260°C, the temperature of the spinning pack and the spinning die was 250°C, and the diameter of the hole of the spinning die was 0.3 mm. Furthermore, each mixed spun fiber was stretched, crimped mechanically, and then cut. The obtained mixed spinning fiber (main filament) was a fiber raw material having a fineness of 6.6 dtex and a length of 51 mm. Secondly, the fiber raw material is passed through the carding machine to become a fiber strand, and is processed into a complex fiber strand through needle punching. The fiber strand was passed through a heating zone at 140° C., and pressed with calender rolls to obtain a relative weight of 670 g / m 2 , F...

Embodiment 2

[0086] A polishing cloth was produced in the same manner as in Example 1 except that an immersion liquid of 5% solid content was used instead of the immersion liquid of 15% solid content polyurethane resin used in Example 1. The ratio of the polymer elastic body (polyurethane resin) to the fiber base material of the abrasive cloth was 5 / 95.

[0087] This polishing cloth was composed of ultrafine fibers as in Example 1. However, compared with the abrasive cloth of Example 1, the fluff was long, the uniformity of the surface was slightly inferior, the dispersion degree of thickness was 3.8, and the tensile strength was 8 N / cm.

[0088] Thereafter, when texture processing was performed in the same manner as in Example 1, scratches rarely occurred. Table 1 shows the physical properties of the obtained abrasive cloth and magnetic recording disk.

Embodiment 3

[0094] Except not grinding|polishing with sandpaper, it produced similarly to Example 1, and produced the non-fluff type polishing cloth.

[0095] The obtained polishing cloth was used for texture processing in the same manner as in Example 1. The average surface roughness Ra of the hard disk was good, reaching 4.0 angstroms.

[0096] Table 2 shows the physical properties of the obtained abrasive cloth and magnetic recording disc.

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Abstract

An abrasive ground fabric which is a composite ground fabric comprising a fiber substrate and a elastic polymer filled in the fiber substrate, wherein (1) the fiber substrate is composed of bundles, each consisting of 20 to 3,000 fine fibers, and (2) the average diameter (D1) of fine fibers existent in a center portion from the center of the cross section perpendicular to a lengthwise direction of each bundle to ½ of the radius of each bundle is 0.3 to 10 mum, the average diameter (D2) of fine fibers existent in a peripheral portion from ½ of the radius to the end of each bundle is 0.05 to 1 mum, and the D1 / D2 ratio is 1.5 or more. According to the present invention, the abrasive ground fabric is suitably used for the texturing of a substrate in the production of a magnetic recording medium, particularly a hard disk, enables high-accuracy surface finish and has excellent strength.

Description

technical field [0001] The present invention relates to an abrasive cloth used in the manufacture of magnetic recording media and the like requiring surface finishing to high precision. In particular, a polishing cloth suitable for texture processing in the production process of magnetic recording disks such as hard disks and a polishing method using the same. Background technique [0002] In recent years, with the development of information processing technologies such as computers, it is required to be able to perform surface finishing on magnetic recording media and silicon wafers with high precision. For example, when manufacturing magnetic recording disks such as hard disks as magnetic recording media, the surface of aluminum, glass, etc. should be smoothed, and then after non-magnetic plating such as nickel-P plating, a material made of cobalt alloy and the like should be formed. The formed magnetic thin film layer is covered with a surface protective layer formed of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B37/24B24B37/00B24B37/04B24B37/20B24D11/00C08G18/08C08G18/66D04H1/46D04H1/48D06M15/564D06M15/568D06M23/10D06N3/00G11B5/84
CPCD06M15/564G11B5/8404D06M23/10D04H1/46C08G18/0852D06M15/568D06N3/0002D04H1/48Y10S428/903B24B37/042C08G18/6607B24B37/24Y10T442/643Y10T442/626Y10T442/686B24B37/245
Inventor 田中学铃木义行北胁秀亮三村正久
Owner TEIJIN LTD
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