JPH03187076A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve corrosion resistance by impregnating a specific compd. into the non-woven fabric of a cleaning sheet in the cartridge. CONSTITUTION:The compd. having a glycidyl group is impregnated in the non-woven fabric of the cleaning sheet 11 in the disk cartridge, by which the excellent corrosion resistance to the chlorine in the atm. air is exhibited. The glycidyl group-contg. compd. to be adequately usable is, for example, epoxidized soybean oil or glycidyl ester of oleic acid, myristic acid or stearic acid. The method for impregnating the glycidyl group-contg. compd. into the non-woven fabric is not particularly restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that rotatably accommodates a magnetic disk within a hard or soft case and further includes a cleaning sheet inside.

More specifically, the present invention relates to a disk cartridge in which a cleaning sheet in sliding contact with the magnetic layer of the magnetic disk is impregnated with a specific compound.

[Prior Art] A disk cartridge is a cartridge containing one magnetic disk, and is used in small magnetic disk devices. Depending on the type of magnetic disk, it is broadly divided into hard disk cartridges and flexible disk cartridges.

In the case of a flexible disk cartridge, as shown in FIG. 1, an accessible magnetic disk 3 is housed inside a case 1 called a jacket made of plastic resin (eg, vinyl chloride). A magnetic head (not shown) is attached to the magnetic surface of this magnetic disk 3.
The case is provided with a head window 5 for sliding contact. Additionally, a J-rotation driving means (not shown) for rotating the magnetic disk is installed on the magnetic disk 3.
A central window 7 is provided for engagement with the central window 7, and an index window 9 is provided for detecting the quasi-position of the rotary talker.

As shown in FIG. 2, the magnetic disk 3 rotates while being cleaned by a cleaning sheet 11 made of a nonwoven fabric called a liner. In order to carry out this cleaning effectively, if necessary, as shown in FIG.
3 and the protrusions 15 can also force the cleaning sheet 11 into contact with the magnetic disk 3. In FIG. 3, a support part 19 of a protrusion is attached to the inner surface of the 8th surface (side 1) 17b of the case 1 and at a position substantially opposite to the projection 15 of the A surface (side 0) 17a of the case 1. A protrusion 21 for prevention is provided. Base 23 of elastic piece 13
is B in case 1 (on the inner surface of side 1: 17b, and
It is fixed near the support part 19. Self-height end 2 of elastic piece 13
5 is supported by the support portion 19 and its tilted state is maintained. With this configuration, the cleaning sheet 11 is partially held up from the case B surface 17b by the elastic piece 13, and its L protrusion is slightly pushed down by the protrusion 15 provided on the case A side 17a, so that the magnetic The disk 3 is elastically held between the upper and lower cleaning sheets tt, tt. As the magnetic disk 3 rotates, both surfaces of the disk are cleaned by a cleaning sheet 11.

[Problems to be Solved by the Invention] There are two types of magnetic recording media: a coating type in which a mixture of ferromagnetic metal powder and a binder is coated on a non-magnetic substrate, and a thin-film type in which a ferromagnetic metal is deposited on the surface of a non-magnetic substrate. be. However, these media are susceptible to corrosion because their magnetic layers are exposed.

To solve this drawback, a lubricant layer and/or
Alternatively, methods of providing a rust preventive layer or forming a Cr segregation film have been tried, and a certain degree of corrosion prevention effect has been achieved.

However, the magnetic layer of the magnetic disk is still susceptible to corrosion by chlorine compounds (eg, hydrogen chloride) in the air, and magnetic properties such as maximum magnetic flux density tend to deteriorate. In the method described above, the anticorrosion effect against such chlorine compounds was clearly a net effect.

Therefore, an object of the present invention is to provide a disk cartridge that has excellent corrosion resistance against atmospheric chlorine and the like.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides at least the following:
In a disk cartridge consisting of a case, a magnetic disk rotatably housed within the case, and a cleaning sheet affixed to the inner surface of the case, the nonwoven fabric used for the cleaning sheet is impregnated with a compound having a glycidyl group. To provide a disc cartridge characterized by:

Preferably, the disc cartridge is a flexible disc cartridge.

[Function] As described above, the disk cartridge of the present invention exhibits excellent corrosion resistance against atmospheric chlorine because the internal cleaning sheet nonwoven fabric is impregnated with a compound having a glycidyl group.

Although the exact mechanism has not yet been elucidated and is still in the realm of speculation, it is believed that free chlorine ions are fixed by the reaction between the glycidyl group and hydrogen chloride as shown below, and corrosion is prevented. Seem.

Glycidyl group-containing compounds that can be suitably used in the present invention include, for example, epoxidized large oil, glycidyl esters such as oleic acid, myristic acid, or stearic acid.

The method of impregnating the nonwoven fabric for cleaning sheets with the glycidyl group-containing compound is not particularly limited.

For example, a nonwoven fabric can be impregnated by dissolving or suspending a glycidyl group-containing compound in a suitable solvent, immersing a nonwoven fabric in the resulting solution or suspension, and then drying it. Alternatively, the nonwoven fabric can be impregnated by spraying a solution or suspension of the glycidyl group-containing compound and then drying it. Alternatively, nylon, rayon, polyethylene terephthalate (PET)
), thermoplastic fibers such as acrylic fibers can be impregnated with a compound of glycidyl foundation, and nonwoven fabrics can also be made from them. When preparing a solution or suspension of a glycidyl group-containing compound, a surfactant can also be used if necessary.

As shown in FIG. 4, the cleaning sheet 11 generally includes a disk side nonwoven fabric 27 facing the magnetic disk 3, a case side nonwoven fabric 29 facing the case 1, and the disk side nonwoven fabric 27 and the case side nonwoven fabric 29. phase! It is preferable to have a three-layer structure including an intermediate nonwoven fabric layer 31 for adhering to i.

The nonwoven fabric constituent material itself used in the disk cartridge of the present invention does not need to be special.

All common nonwoven construction materials traditionally used in the field of magnetic recording media can be used in the disk cartridge of the present invention.

For example, both the disc-side nonwoven fabric layer 27 and the case-side nonwoven fabric layer 29 may be made of rayon fiber alone. This type of structure with no front and back sides is extremely convenient since there is no need to inspect the front and back sides of the nonwoven fabric when installing the cleaning sheet in the case. As a rayon fiber,
Viscose rayon, copper ammonia rayon, acetate rayon, etc. can be used. In the present invention, both the disk-side nonwoven fabric layer 27 and the case-side nonwoven fabric layer 29 are preferably composed of nonwoven fabrics whose single fibers have a tensile elongation of 50% or more.

The intermediate nonwoven fabric layer 31 can also be composed of a mixed fiber layer of rayon fibers and polyamide fibers. The mixing ratio of rayon fiber and polyamide fiber is generally about 179 to 9/1.
In particular, the range of 3/7 to 7/3 is dangerous.

For the intermediate nonwoven fabric layer 31, in addition to the mixture of rayon fiber and polyamide fiber as described above, various thermoplastic resins such as polyethylene terephthalate, polyethylene, polypropylene, polystyrene, polyvinyl chloride, and acrylic resin can also be used. .

The cleaning sheet 11 can be made of rayon fiber alone, but by providing an intermediate nonwoven fabric layer 31 made of a nonwoven fabric containing a thermoplastic resin between the disk side nonwoven fabric layer 27 and the case side nonwoven fabric layer 29, the cleaning sheet 11 can be made of rayon fiber alone. Thermal adhesion properties are improved.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Jōmaru Ritsu [[ After cross-dispersing the composition consisting of the ingredients in the amounts listed in
A magnetic layer was formed by coating both sides of a 75 μm thick polyethylene terephthalate film to a thickness of 2.5 μm. Next, this was punched out into a disk shape with a diameter of 86 mm to produce a magnetic disk.

A disk cartridge was prepared by storing the above-mentioned magnetic disk in a cartridge strip having a nonwoven fabric made of rayon fiber and polyamide fiber impregnated with epoxidized soybean oil and attached to the inner surface as a cleaning sheet.

Ichigo 1m Metal magnetic powder 100 PVC/vinyl acetate/vinyl alcohol copolymer 14 Polyurethane resin 8.53 Ginogai incyanate crosslinking agent 5.5AJ! 203
20 fatty acid esters
8 Cyclohexanone 18
0 toluene 180 stop comparison 1
0- A disk cartridge was produced in the same manner as in Example 1 except that the nonwoven fabric was not impregnated with epoxidized soybean oil.

Each disk cartridge obtained as described above was heated at 30° C., 70% RH, and C7010PPB.

After being left under the conditions of H2810PPB and NO2100PPB for 711 hours, the change in maximum magnetic flux density was measured using a sample vibrating magnetometer.

Approximately shown.

The results are shown in Table 1 below.As is clear from the above results, the disk cartridge with a cleaning sheet made of a nonwoven fabric impregnated with a glycidyl group-containing compound contains less chlorine than the disk cartridge with a conventional cleaning sheet attached. Shows excellent corrosion resistance under atmospheric conditions.

Although the present invention has been described in detail with respect to a flexible disk cartridge, the present invention can be implemented similarly with respect to a hard disk cartridge.

Also, in implementing the present invention, the size of the cartridge does not matter. Discs larger than 8 inches (e.g. 1
The present invention can be implemented with all hard and flexible magnetic disks that are actually used, such as disks of 2 inches or smaller (for example, 2 inches) or smaller than 3.5 inches (for example, 2 inches).

The magnetic layer of the magnetic disk may be either a coated plastic or a thin film type. Similarly, the material of the case does not matter.

[Effects of the Invention] As explained above, according to the present invention, a disk car 1-- which has excellent corrosion resistance against atmospheric chlorine by impregnating a nonwoven fabric for a cleaning sheet with a glycidyl group-containing compound. IJ edge is obtained.

[Brief explanation of drawings]

Figure 1 is a rear view of a conventional flexible disk cartridge, Figure 2 is a cross-sectional view taken along the line FIG. 4 is a partial sectional view of an example of the nonwoven fabric used in the present invention. 1... Jacket (case), 3... Magnetic disk. 5... Head window, 7... Central window, 9... Index window. 11...Cleaning sheet, 13...Elastic piece. 15... Protrusion, 17a... Jadev 18 sides. 17a... Jacket A side, 19... Support part. 21... Convex strip, 23... Elastic piece base. 25...Free end of elastic piece, 27...Disk side nonwoven fabric layer.

Claims (3)

[Claims] (1) In a disk cartridge consisting of at least a case, a magnetic disk rotatably housed in the case, and a cleaning sheet affixed to the inner surface of the case, the nonwoven fabric used for the cleaning sheet has a glycidyl group. A disc cartridge characterized in that it is impregnated with a compound. (2) The disk cartridge according to claim 1, wherein the disk cartridge is a flexible disk cartridge. (3) The disk cartridge according to claim 1, wherein the disk cartridge is a hard disk cartridge.