JPH0527034U - Bonding material for flexible magnetic disks - Google Patents

Abstract

(57) [Summary] [Structure] Releasable carrier whose surface is subjected to release treatment.
It comprises (2) and a pressure-sensitive adhesive (5) protruding from the release-treated surface of the releasable carrier. The releasable carrier (2) is provided with through holes (3) at predetermined intervals, and the pressure-sensitive adhesive (5) is projected in a dot-like manner on the surface of the releasable carrier according to a certain law. [Effect] It is easy to manufacture and process, and mass production is possible. Also, when manufacturing a 3.5-inch flexible magnetic disk, the center hub and the magnetic disk body are effectively bonded without causing a bonding failure. I can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joining material for a flexible magnetic disk, the purpose of which is to securely and efficiently fix and join a ring-shaped magnetic disk and a hub when a recording medium (floppy disk) having a flexible magnetic disk is assembled. The purpose is to provide a flexible magnetic disk bonding material that can be used.

[0002]

[Prior Art]

 A 3.5-inch flexible disk used as a recording medium for computers and word processors mainly has the configuration shown in Fig. 11. In the figure, (D) is an annular magnetic disk, and this magnetic disk (D) has a hole (a) formed in the center. (C) is a metal center hub made of magnetic stainless steel, and this center hub (C) has an A-ring (A) made of double-sided tape or the like on the surface of the hole (a) of the magnetic disk (D). It is firmly fixed. The magnetic disk (D) to which the center hub (C) is fixed in this way is housed in a plastic cartridge (P) to form a 3.5-inch flexible disk.

In the assembling of the 3.5-inch flexible disk having such a structure, conventionally, the center hub (C) and the magnetic disk (D) are joined by the double-sided adhesive tape punched product as shown in FIG. A-ring (A) (adhesive ring) was used. This A-ring (A) is a double-sided adhesive tape (B) having an adhesive layer (e) formed on both sides of a substrate (d) as shown in FIG. It is attached to the surface of a rectangular carrier (G), and then, as shown in FIG. 8, only the double-sided adhesive tape (B) is perforated in a substantially circular shape at regular intervals, and the double-sided adhesive tape (B) is left over. After removing the part by peeling, the double-sided adhesive tape (B) perforated in a substantially circular shape was punched with a through hole (k) in a predetermined size, and a release paper (H) was covered from above. As shown in FIG. 10, this A-ring (A) joins the flexible magnetic disk (D) and the center hub (C) to the periphery of the hole (a) formed in the center of the flexible magnetic disk (D). Glued to let.

[0004]

[Problems to be solved by the device]

 Since the A-ring (A) used in the past has the above-mentioned structure, there is a problem that the effective bonding area is small, the material cost and the processing cost are high, and the cost is high. In particular, there were processing problems such as the product coming off the specified position of the carrier during punching, and there was a problem during mass production.

Further, in the conventional A-ring (A), since the outer peripheral portion is half-cut, setting of the punching die may damage the peeling treatment layer on the upper surface of the carrier. The pressure-sensitive adhesive layer of the A-ring (A) during storage may flow and permeate, resulting in defective peeling during use. Further, during transportation and storage, the A-ring wound on the reel may be tightly wound to cause a shift. On the other hand, when the flexible magnetic disk (D) and the center hub (C) are joined together using the A-ring (A), there is a misalignment of the A-ring (A) or a connection failure due to wrinkles. Occurrence was also a problem.

[0006]

[Means for Solving the Problems]

 In this invention, a releasable carrier having through holes formed at predetermined intervals is used as a base material, and a pressure-sensitive adhesive is projected on the surface of the releasable carrier in a dot form according to a certain law. By providing a bonding material for a flexible magnetic disk, which is characterized by the above, the above-mentioned conventional drawbacks are eliminated.

[0007]

【Example】

 The structure of the flexible magnetic disk bonding material according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a flexible magnetic disk bonding material (1) according to the present invention, and FIG. 2 is a sectional view taken along the line AA ′ of FIG. In the figure, (2) is a releasable carrier, (3) is a through hole, (4) is a release paper, and (5) is a point-like pressure-sensitive adhesive projecting according to a certain law. In the present invention, the constant law is not particularly limited as long as the pressure-sensitive adhesive (5) having a constant shape is arranged with a certain regularity such as a grid shape or a square pattern, and is not particularly limited. ..

In the present invention, as the releasable carrier (2), a releasable treatment sheet in which a releasant is applied to paper or a plastic sheet, or a fluororesin sheet having releasability to itself is preferably used. It In this invention, a pressure-sensitive adhesive (5) is projected intermittently on the release treated surface of the releasable carrier (2).

The pressure-sensitive adhesive (5) is not particularly limited and may be appropriately selected depending on the required characteristics such as silicone type, acrylic type and rubber type. In this device, a liquid pressure-sensitive adhesive (5) is projected on the releasable carrier (2) in a dot-like constant shape and a constant array by using a gravure roll, a screen, etc. The installation method is not particularly limited, and an appropriate method can be appropriately selected depending on the viscosity of the pressure-sensitive adhesive (5) or the shape and size of the protruding points. The pressure sensitive adhesive (5) may be projected over the entire surface of the releasable carrier (2) or over the through hole (3) with a conventional A-ring width only required. There is no particular limitation. The protruding shape of the pressure-sensitive adhesive (5) may be circular as shown in FIG. 1 or angular as shown in FIG. 3, and is not particularly limited.

The through holes (3) may be provided in the releasable carrier (2) at regular intervals before the pressure sensitive adhesive (5) is projected, or may be punched after coating. There is no particular limitation.

FIGS. 4 to 6 are explanatory views showing a usage state of the flexible magnetic disk bonding material (1) of the present invention. When assembling a 3.5-inch flexible magnetic disk, first insert the bottom part (C-1) of the center hub (C) into the through hole (3) of the flexible disk bonding material (1) as shown in Fig. 4. .. Next, as shown in FIG. 5, the edge portion (C-2) of the center hub (C) and the pressure-sensitive adhesive (5) are pressure-bonded to each other. Then, as shown in FIG. 6, when the center hub (C) is lifted up, the surface of the releasable carrier (2) has been subjected to a peeling treatment, so that the pressure sensitive adhesive (5) protruding from the surface can be easily attached. Further, only the necessary portion of the pressure-sensitive adhesive (5) is transferred to the edge portion (C-2) of the center hub (C) by an amount corresponding to the area of the bonding surface of the center hub (C). In this way, by using the center hub (C) with the pressure sensitive adhesive (5) attached to the edge (C-2) and fixing the center hub (C) and the magnetic disk body to each other, the conventional A -By using the ring, it is possible to eliminate the poor connection due to the A-ring displacement and wrinkles that have occurred at the time of bonding.

[0013]

[Test example]

 Next, the flexible magnetic disk bonding material according to the present invention will be described in detail with reference to test examples. (Test Example 1) Releasability is provided by providing circular through-holes (diameter 25 mm) at regular intervals in a peeled rectangular polyester film (Mitsubishi Rayon Co., Ltd., trade name: Diafoil MRD75). As a carrier, an acrylic adhesive (trade name: SK Dyne 100, manufactured by Soken Chemical Industry Co., Ltd.) was used on the release treated surface of this releasable carrier, and a 0.1 mm thick 30 mesh stainless box and squeegee were used. Then, it was dried and cured at 100 ° C. for 5 minutes to obtain a flexible disk bonding material.

The center hub and the magnetic disk body were fixed to each other by using the obtained flexible disk bonding material, and a 3.5-inch flexible magnetic disk was assembled. We were able to easily manufacture a 3.5-inch flexible magnetic disk without causing misalignment or wrinkling.

[0015]

[Effect of the device]

 As described in detail above, this invention uses a releasable carrier having through-holes formed at predetermined intervals as a base material, and a pressure-sensitive adhesive is applied on the surface of the releasable carrier in a dot-like manner. Since it is a bonding material for flexible magnetic disks, which is characterized by being protruded according to the rules, it is easy to manufacture and can be mass-produced, and the effective bonding area is also effective when bonding the magnetic disk body and the center hub. This has the excellent effect that the adhesive component can be transferred to the center hub, and at the time of this joining, the joining and fixing can be reliably performed without causing the joining failure that has occurred in the conventional use of the adhesive ring.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing an embodiment of a bonding material for a flexible magnetic disk according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.

FIG. 3 is a plan view showing another embodiment of the bonding material for a flexible magnetic disk according to the present invention.

FIG. 4 is a cross-sectional explanatory view showing one usage state of the bonding material for a flexible magnetic disk according to the present invention.

FIG. 5 Same as above.

FIG. 6 Same as above.

FIG. 7 is an enlarged partial sectional view showing a conventional A-ring.

FIG. 8 is an explanatory plan view of the same.

9 is a cross-sectional explanatory diagram of FIG.

FIG. 10 is a cross-sectional explanatory view showing a usage state of a conventional A-ring.

FIG. 11 is an exploded view of a 3.5-inch flexible disk.

[Explanation of Codes] 1 Flexible Magnetic Disk Bonding Material 2 Releasable Carrier 3 Through Hole 4 Release Paper 5 Pressure Sensitive Adhesive

Claims (2)

[Scope of utility model registration request] 1. A releasable carrier having through-holes formed at predetermined intervals is used as a base material, and a pressure-sensitive adhesive is projected on the surface of the releasable carrier in a dot form according to a certain law. A bonding material for a flexible magnetic disk, which is characterized by: 2. The bonding material for a flexible magnetic disk according to claim 1, further comprising a release paper.