JPH0660593A - Liner for floppy disk - Google Patents

Abstract

PURPOSE:To improve cleanability by using special section fibers having edge parts on the surface layer, which comes into contact with disks, of a non-woven fabric in which thermocompression bonded parts and non-thermocompression bonded parts exist and the form is maintained by the thermocompression bonded parts. CONSTITUTION:The non-woven fabric in which the thermocompression bonded parts and the non-thermocompression bonded parts exist and the form is maintained by the thermocompression bonded parts is formed. Namely, the non-woven fabric consists of the contact layer 1 with the disks, an intermediate layer 2 and a contact layer 1' with jackets and is formed with recessed parts 3 compression-bonded by hot embossing. The fibers which come into contact with the dust on the disks with sufficient force are used for this contact layer 1 and are provided with the sharp edge parts in order to wipe off or scrape off the dust or magnetic powder on the disks. The fibers have a bulky state and have the increased gap parts to accommodate the removed dust with some sectional shapes and, therefore, the extremely fine fibers, such as special section fibers, consisting of split type composite fibers, as shown in Fig., are used. As a result, the cleaning characteristic is improved and the excellent result of the evaluation of error generation is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner made of a non-woven fabric sheet used for the inner coating of floppy disks.

[0002]

2. Description of the Related Art The exterior of a floppy disk is generally called a jacket and is made of vinyl chloride or ABS resin, and a fiber sheet is laminated on its inner surface as a liner. This liner blocks direct contact between the floppy disk and the resin sheet that constitutes the jacket body, avoids damage to the floppy disk, and wipes away dust such as magnetic powder that falls off the floppy disk surface. It plays a role, and various liners have been conventionally proposed.

In particular, as the storage capacity of a floppy disk has increased in recent years, not only the liner itself does not generate dust but also the ability to actively clean dust and dirt that has entered the floppy disk. It has come to be required by the liner. However, the conventional liner for a floppy disk is focused on that it does not generate dust, and from the viewpoint of improving the cleaning property, the nonwoven fabric is subjected to a soft processing to improve the cushioning property. Was applied by post-processing, and there was a problem that the cost increased and the softener used led to a disk error.

As a method for solving such a problem, it is considered to improve the cleaning property at the stage of manufacturing the nonwoven fabric. As such a method, Japanese Patent Laid-Open No.
9-30272, and Japanese Patent Laid-Open No. 2-33784.
The publication discloses a method of imparting elasticity to a non-woven fabric and exhibiting a cleaning effect by using ultrafine fibers as constituent fibers of the non-woven fabric liner.

[0005]

However, in order to improve the performance of floppy disks in recent years, the above-mentioned liner for floppy disks using ultrafine fibers is not sufficient, and a nonwoven fabric having a more excellent cleaning effect is constructed. It was necessary to find a fiber material that would work.

[0006]

Means for Solving the Problems As a result of intensive studies on the above problems, the present inventors have focused on the fibers constituting the surface layer of the liner and improved the cleaning property by using the fibers having a special cross section. The present invention has been found out.

That is, according to the present invention, a nonwoven fabric having a thermocompression bonding portion and a non-compression bonding portion, the shape of which is retained by the thermocompression bonding portion, includes a fiber having a special cross section having an edge portion in at least a surface layer contacting the disk. The main point is the liner for floppy disks.

A detailed analysis of the phenomenon of cleaning includes the following three elements. The first is to scavenge the dust present on the disk surface, the second is to scrape off the substance adhering to the disk surface, and the third is to hold the wiped or scraped dust. Among these, particularly regarding the first and the second, it is considered that the state of the contact layer with the disc in the liner has a great influence.
Therefore, in the present invention, the cleaning property can be greatly improved by making the fiber constituting the surface layer of the liner a fiber having a special cross section.

The present invention will be described in detail below with reference to the drawings. FIG. 1 shows a model of a cross section of an example of the nonwoven fabric of the present invention. Disc contact layer 1 and intermediate layer 2
And a contact layer 1'with the jacket, and 3 is a recessed portion which is pressed by hot embossing. The intermediate layer 2 may be formed of only the adhering fibers, but may be mixed with other fibers. Further, the intermediate layer 2 may be formed as a multi-layer structure. The contact layer 1 with the disk is the part that most affects the cleaning property, and is usually composed of synthetic fibers with a round cross section or fibrous fibers with a chrysanthemum cross section, either alone or in a mixed state. However, the fibers having such a cross-sectional shape do not sufficiently contact the dust on the disk, and a satisfactory wiping property cannot be obtained.

Therefore, the cleaning property is improved by using, for the contact layer 1 with the disc, a fiber that contacts the dust on the disc with sufficient force. 2 and 3 show examples of such fibers. These fibers have a sharp edge portion, and dust or magnetic powder on the disk is wiped or scraped off at this portion, so that sufficient cleaning property can be obtained. Further, depending on the cross-sectional shape, since it is in a bulky state, the number of voids increases, and the dust retaining property of holding the removed dust in the voids is also improved.

FIG. 4 shows an example of a special cross-section fiber composed of splittable conjugate fibers, but similar effects can be obtained by using such a fiber. Further, the present inventors have found that the splittable conjugate fiber improves the cleaning property even when the fiber density is increased. In this case, it is considered that this is because the contact area between the fiber and the disk becomes large, so that the chances that the dust on the disk comes into contact with the fiber increase.

In the present invention, the contact layer 1 with the disk
As the fiber, it is possible to use the above fibers alone or in combination, and further, to use a mixture with other fibers.

As the binder fiber, a low melting point thermoplastic synthetic fiber is used for the sheath part, and a high melting point thermoplastic synthetic fiber is used for the core part. It is effective to use the core-sheath type composite fiber used as the fiber.

The liner for a floppy disk is subjected to an embossing treatment in order to impart a proper elasticity and pressure to the disk surface. In the present invention, the embossing treatment is performed for the same purpose as shown in FIG. Is preferably applied.

The fiber length of the fibers used for the floppy disk liner of the present invention is not particularly limited as long as it is the same as that used for ordinary floppy disk liners.

[0016]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. Example 1 Rayon fiber (fineness 1.5d, fiber length 51)
mm), an adhering fiber (consisting of sheath core and a sheath portion consisting of heat-adhesive polyester fiber, melting point 200 ° C.,
2d, 51 mm), Vivian (registered trademark) manufactured by Mitsubishi Rayon Co., Ltd. (Y-shaped cross-section acrylic fiber, 51 mm),
Five cards are connected to produce a multi-layer parallel web having a basis weight of 35 g / m 2. In this case, the middle part of the multilayer parallel web is composed of a weight ratio of 50% rayon fiber and 50% of bonding fiber, and the surface phase is a web configuration composed of 50% rayon and 50% Vivian (registered trademark). This multilayer parallel web was pressed with an embossing roller having a surface temperature of 220 ° C. to produce a nonwoven fabric having an uneven surface.

[Example 2] Rayon fiber (fineness: 1.5
d, fiber length 51 mm), adhesive fiber (used in Example 1, SOL-OHM (registered trademark) manufactured by Mitsubishi Rayon Co., Ltd.)
Using (self-dividing fiber made of polypropylene and polyester, fiber length 51 mm), 5 cards are connected to produce a multi-layer parallel web having a basis weight of 35 g / m 2. In this case, 50% rayon fiber and 50% adhesive fiber in the middle part
The surface layer is made of rayon fiber 70.
%, And SOLOHM (registered trademark) 30%. This multilayer parallel web was pressed with an embossing roller having a surface temperature of 220 ° C. to produce a nonwoven fabric having an uneven surface.

[Comparative Example 1] In Example 1, in place of Vivian (registered trademark), ordinary acrylic fiber (1.5d,
51 mm) was used to make a non-woven fabric.

[Comparative Example 2] In Example 2, in place of Sol-Ohm (registered trademark), ordinary polyester fiber (1.
5d, 51 mm) was used to make a nonwoven fabric.

[Comparative Example 3] Comparative Example 3 was prepared by using ordinary rayon fibers (fineness: 1.5 d, fiber length: 45 mm) in Example 3.

The cleaning properties of the above-mentioned examples and comparative examples were evaluated by the following method. [Evaluation Method] A disk is incorporated into a shell provided with a liner for a floppy disk to prepare 100 pieces each.
Next, leave the window part of the floppy disk open in the atmosphere for 7 days. After that, using a drop-IN-OUT counter manufactured by Tokyo Engineering Co., Ltd., the reproduction output immediately after and after 1800 pass rotation was measured to confirm the error occurrence state. The evaluation results are shown in Table 1, which shows that the liner of the present invention exhibits excellent cleaning properties.

[0022]

[Table 1]

[0023]

In the liner for a floppy disk of the present invention, the effect of wiping or scraping off the dust on the disk surface is dramatically improved by using the special cross-section fiber having the edge portion in the disk contact layer. It exhibits excellent cleaning properties such as improved dust retention and can be used as a high-performance floppy disk liner.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a floppy disk liner according to the present invention.

FIG. 2 is a cross-sectional view of an example of a special cross-section fiber used in the present invention.

FIG. 3 is a cross-sectional view of an example of a special cross-section fiber used in the present invention.

FIG. 4 is a cross-sectional view of an example of the splittable conjugate fiber used in the present invention.

[Explanation of symbols]

 1 Contact layer with a disc 1'Contact layer with a jacket 2 Liner intermediate layer 3 Recesses pressed by heat embossing

Claims (3)

[Claims] 1. A non-woven fabric having a thermocompression-bonding portion and a non-pressure-bonding portion, the shape of which is retained by the thermocompression-bonding portion, at least the surface layer in contact with the disk includes a special cross-section fiber having an edge portion. A liner for a floppy disk. 2. The liner for a floppy disk according to claim 1, wherein ultrafine fibers made of splittable conjugate fibers are used as the special cross-section fibers. 3. A fiber having a special cross section, which is 0.1 to 0.1% after splitting.
The liner for a floppy disk according to claim 1 or 2, wherein a splittable conjugate fiber having a number of 0.7d of 50% or more is used.