JP3030381B2 - Texture tape for hard disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the quality of a texture tape for a hard disk.

[0002]

2. Description of the Related Art Hitherto, raised fabrics, pile fabrics, and electrostatic flocking have been used as texture tapes for hard disks. However, the raised layer acting on the texture has uneven texture due to unevenness in pile density and length. Had a disadvantage. In particular, in order to meet the needs for higher quality hard disks, it is necessary to make the texture uniform and fine. For this reason, it is considered that effective thinning and densification of the fibers acting on the texture are effective means. Furthermore, because of the raised structure, the amount of slurry supplied,
The ratio with the amount of slurry acting on the texture is small,
It had the disadvantage of increasing costs.

[0003]

As described above, the non-uniformity of the texture is caused by unevenness of the density of the fiber pile constituting the nap layer acting on the texture of the texture tape.
This is due to unevenness of dispersion and adhesion of the slurry to the napped layer due to unevenness in length. The present invention seeks to make the layer composed of the fibers acting on the texture uniform, and to make the dispersion and adhesion of the slurry uniform.

[0004] It has been extremely difficult in terms of production technology to form a nap layer uniformly and densely with a pile of ultrafine fibers, which is required particularly for fine textures.

Further, a large amount of the slurry in which the abrasive grains are dispersed adheres to the interior of the nap layer, and a small amount of the slurry adheres to the upper layer of the nap layer acting on the texture. There was a drawback that did not work.

An object of the present invention is to provide a texture tape for a hard disk capable of producing a uniform, fine, high-quality texture effect at low cost without changing the conventional texture equipment and method. Things.

[0007]

Means for Solving the Problems In order to solve the above problems, in the first invention, a random wave of fibers having a non-hydrophilic property is joined to a random wave of fibers having a hydrophilic property. Two layers of random waves of fibers having opposite hydrophilic properties were joined.

[0008] In the second invention, the thickness of the fibers constituting the random wave having a hydrophilic property is set to 0.5 denier or less.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The first aspect of the present invention is to bond short or long fibers having hydrophilic properties such as rayon, vinylon and nylon with a thermal bond method, a spunlace method, a spun bond method, a melt blow book, a needle punch method and the like. A random wave having a uniform thickness and density was prepared by the nonwoven fabric manufacturing method described above.
On the other hand, a random wave was prepared in the same manner using fibers having non-hydrophilic properties such as polypropylene and polyethylene.
The random waves formed on each of them were joined by heating, pressing or using an adhesive to form a texture tape having a hydrophilic wave-having random wave as a texture acting layer.

In the second aspect of the present invention, the random wave having hydrophilic properties of the texture acting layer is made of fine denier fibers having a thickness of 0.5 denier or less and a dense and uniform random wave.

[0011]

[Example 1] A random wave having a basis weight of 30 g / m ² was made of a 0.02 denier nylon fiber by a melt blow method. Separately, a random wave having a basis weight of 70 g / m ² was prepared using a polypropylene fiber having a thickness of 0.7 denier by the same melt blow method. A heat-adhesive resin solution is applied to one side of a random wave of polypropylene fiber by a spray method (the amount of applied resin is 3 g /
m ² ) After drying, using a calender roll having a roll surface temperature of 60 ° C., heating and pressurizing, a nylon random wave and a polypropylene random wave were bonded to obtain a texture tape. Using the nylon fiber surface of this texture tape as the texture action surface, and using an aluminum / nickel disk with diamond slurry,
As a result of the texturing, as shown in Table 1, a fine and uniform texture having a very small surface roughness was obtained. Furthermore, the amount of slurry used was reduced by 30% compared with the electrostatic flocking product (conventional product) used in the comparative test. The texture of the first embodiment is a processing machine: Strasberg 6
Using DE-DC-ISP, diamond particle size 0.5
This was done using a millimicron slurry. The evaluation was performed by measuring the surface roughness using Taristep Taridata 2000.

[0012]

[Table 1]

Example ² A random wave having a basis weight of 50 g / m ² was formed by a melt blow method using nylon fiber having a thickness of 0.01 denier. Separately created by card method,
A random wave of polyester short fiber having a thickness of 3 denier and a length of 50 mm was impregnated with an acrylic resin emulsion containing a fluorine-based water repellent and dried to prepare a water-repellent random wave having a basis weight of 50 g / m ² . On one side of the polyester fiber random wave, a polyurethane-based adhesive solution is applied by a spray method and dried, and then, using a calender roll machine having a roll surface temperature of 50 ° C., the nylon fiber random wave is bonded and adhered, and the texture is applied. Created a tape. Using the nylon fiber surface of this texture tape as a texture acting surface, and using an aluminum / nickel disk using diamond slurry, a very low surface roughness and uniform texture was obtained as shown in Table 2 as a result. Furthermore, the amount of slurry used is 18 compared to the brushed fabric (conventional product) used in the comparative test.
% Reduction. The texture of Example 2 was performed using a processing machine: 6DE-DC-ISP manufactured by Strasberg Co., Ltd., and using a slurry having a diamond particle diameter of 1.0 mm. Evaluation is Tally Step Tally Data 20
At 00, the surface roughness was measured.

[0014]

[Table 2]

[0015]

The texture tape according to the first aspect of the present invention has a two-layer structure in which a random wave of hydrophilic fibers and a random wave of non-hydrophilic fibers are joined, and the random wave layer of hydrophilic fibers is used as a texture acting layer. Since the texture tape has a uniform and dense structure with a random wave and a hydrophilic property, the slurry is uniformly dispersed and adhered to exhibit a very uniform texture effect.

Further, since the lower layer of the random wave of fibers having hydrophilic properties, which is the texture acting layer, is composed of the random wave of fibers having no hydrophilic properties, the slurry does not penetrate into the lower layer, and the hydrophilic layer having texture effects is not formed. Since the slurry adheres only to the random wave of high-performance fibers, the amount of slurry used can be greatly reduced.

According to the second aspect of the present invention, the texture of the random layer having a hydrophilic property can be reduced to 0.5 denier or less so that the texture of the random layer becomes fine and dense. Since the adhesion state becomes fine and dense, a very fine and uniform texture can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G11B 5/84 D04H 3/14 D06C 15/00

Claims (2)

(57) [Claims] 1. A texture tape for a hard disk, comprising joining a random wave of fibers having non-hydrophilic performance to a random wave of fibers having hydrophilic performance. 2. The texture tape for a hard disk according to claim 1, wherein the fibers constituting the random wave having a hydrophilic property have a thickness of 0.5 denier or less.