JPS6182393A - Floppy disk jacket - Google Patents

Abstract

PURPOSE:To prevent a nap and separation of the fiber without thermal deformation by cold-pressing the circumference of the punched processing and hardening a fiber of the lined unwoven fabric liner. CONSTITUTION:A plastic sheet 1, to which an unwoven liner 2 is lined, is punched, the edge part is folding-welded and a floppy disk jacket is formed. The punched processing circumference is cold-pressed, and becomes a compressed liner 3 to which a liner fiber is fixed. By the method in which thermal processing is not executed, separation and napping of the fiber can be prevented without thermal deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a floppy disk jacket, particularly a floppy disk jacket that effectively prevents fibers from coming off from a nonwoven liner lined with a plastic sheet. It is related to.

(Prior Technology) A bag-like jacket for a floppy disk is made by lining one side of a plastic sheet, which serves as the outer cover material, with a liner made of non-woven fabric.

The central window is made by punching out a window, etc., then folding and welding the ends, and as the disc inserted into the window rotates, the non-woven fabric is The disadvantage is that detachment 1 fuzz occurs, which leads to disk misrotation errors.

Therefore, for this floppy disk jacket, after the above-mentioned punching process, the nonwoven fabric liner is thermally pressed around the opening to integrate it with the plastic sheet, or the fibers are partially incinerated with flame. Regarding this, a method of shrinking the fibers using a heating jig is also known (Japanese Patent Application Laid-Open No. 58-1665).
(Refer to Publication No. 69) However, the method of thermally pressing the punched part causes significant thermal deformation of the sheet, and the method using flame has the disadvantage that it is not effective in separating the fibers generated from inside the punched part, and shrinks the fibers. With this method, the shrinkage of the fiber itself is not large;
If you try to shrink it more than that, there is a drawback that the sheet part will also be thermally deformed.

(Structure of the Invention) The present invention relates to a floppy disk jacket that solves these disadvantages, and is made by cold pressing the periphery of the punched part of a plastic sheet lined with a nonwoven fabric liner to solidify the liner fibers. It is characterized by this.

To explain this, 1. The present inventors found that fiber detachment.

As a result of various studies on manufacturing methods for floppy disk jackets that do not cause fuzzing, we found that if the area around the punching process where fiber detachment and fuzzing is likely to occur is cold pressed to solidify the fibers, such disadvantages can be completely eliminated. Headline that you can.

We are conducting research on this cold pressing means, pressing force, etc.
Regarding this, if the treatment is performed at 15-50°C and a pressure of 150-300~/d, the K1M fibers can be separated without causing disadvantages due to thermal deformation of the plastic.

The present invention was completed after confirming that fluffing can be prevented and that thermal deformation can be significantly reduced if this treatment is performed after a known heat pressing treatment.

Next, the present invention will be explained based on the accompanying drawings. 1st
The figure shows a top view of a floppy disk jacket, which includes a central window A, a head window B, an index window 0. A write protect notch D and a relief notch E are provided by punching, and magnetic media is inserted through the upper opening and the opening is sealed to form a floppy disk.

FIG. 2 is a plan view of this floppy disk jacket before molding. In this figure, a nonwoven fabric liner 2 is pasted on one side of the plastic sheet 1, and after being folded along the +X-X' line, the edge of the plastic sheet 1 is Parts 1a and 1b are x-
After bending along the x' line and welding, a 7i disk jacket as shown in Fig. 1 is obtained by punching.In order to attach the non-woven fabric liner 2 to the plastic sheet 1, After the liner 2 is placed on the plastic sheet 1, the nonwoven fabric liner 2 may be thermally welded by pressing a heating grid or a heating plate from the top surface of the plastic sheet 1. Although the detachment of liner fibers can reduce the occurrence of fluff, this does not necessarily provide a sufficient effect. In addition, the above-mentioned punching process may be performed immediately after pasting the nonwoven liner, but
This may be done after the edges 1a, 1b are bent and welded. ' The floppy disk jacket of the present invention is made by cold pressing the area around the punched portion of the joint between the plastic sheet 1 and the nonwoven liner 2.

According to this, the nonwoven fabric liner around the punched portion is compressed by cold pressing and solidified to form a compressed liner 3 as shown in FIG. 3.

The rotation of the magnetic media also has the advantage of eliminating fiber detachment and fluffing. Note that this cold pressing may be performed around the opening after the punching process, but it may also be performed on the entire surface of the punching area including the periphery of the planned punching line before punching. If this is carried out subsequently after adhesion by hot pressing, the effect of reducing thermal stress deformation of the plastic sheet 1 due to this thermal processing is also added. This cold pressing is, for example, 150 to 300 kg1c at a temperature of 15 to 50°C.
r! It is sufficient if the pressure is applied to - According to this, the thickness is usually 0,
17-0.25mm non-woven liner is 0.05-0.
It is compressed to 0.08 mm and has a density more than three times as large.

Note that this cold pressing may be performed within a range of 3 to 5 mm around the punched portion A-E shown in Figure 1, but this range may be determined depending on the length of the fibers constituting the nonwoven fabric liner. .

Next, examples of the present invention will be shown.

Example 1 A nonwoven fabric liner with a thickness of 0.25 mm consisting of 85% rayon and 15% polyester was placed at 190/°C on a plastic sheet made from chlorinated polyvinyl chloride in the shape shown in Figure 2. Using a heated mold, 10
After adhering by pressing for 0.3 seconds at a pressure of Kt/-, the area expanded by 3B around the punched parts A to E in FIG. Kf
When cold pressing was performed for 3 seconds at a pressure of /-, the nonwoven fabric liner at the pressed part solidified to a thickness of 0.08 mm.

Next, the ANE section is punched out from this plastic sheet, folded along the line xx' in Figure 2, and the edges 1a-1b of the plastic sheet are folded back and heat welded to form the floppy disk shown in Figure 1. make a jacket,
Magnetic media was inserted through the upper opening, and the opening was sealed to create a floppy disk.

Next, play this floppy disk 5 times per second.

After rotating 1,000 times with a 10mm stroke.

When examining the protrusion of the nonwoven fabric liner from the A-B punched portion, it was found that there was no protrusion with a length of 2i+m or more, and 5 liners with a length of 2i+m or less were found.

However, for comparison, we conducted a similar test on floppy disks made without cold pressing as described above, and found that 25 floppy disks with 5 or more disks, 2-
78 pieces of 5 inch and 184 pieces of 2 inch or less were found, and it was confirmed that the floppy disk jacket of the present invention had significantly less fiber separation from the nonwoven liner and fluff.

Example 2 A floppy disk jacket was made in the same manner as in Example 1, except that the nonwoven fabric liner in Example 1 was made of 95% rayon and 5% polypropylene and had a thickness of 0.22 mm. Place it at 70X
After fixing emery paper of ÷800 to a jig of 70 mm square, applying pressure of 100 mm to central window A, head window B, and upper VC, and making it reciprocate 10 times, this occurred. When we investigated the fluff, we found that there were no fluffs that were more than 1 inch (2 fluffs that were less than 1 inch were found, but for comparison purposes, the floppy disk jacket made without the above-mentioned cold pressing) In the test, there were 4 cases of 3 to 4 dragons, 6 cases of 2 to 3 dragons, and 29 cases of 2 or less dragons. 1. In the case of the present invention, fibers were separated from the nonwoven fabric liner. 1. Fluffing occurred. It was confirmed that the amount was significantly lower.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventionally known floppy disk jacket, Fig. 2 is a plan view of the floppy disk jacket before molding, and Fig. 3 is a longitudinal sectional view of the nonwoven fabric liner in the floppy disk jacket of the present invention. be. 1...Plastic sheet. 2...Nonwoven fabric liner-3=...Compression liner, 1a, 1b...Edge. A...Central window. B...Head window. O... Index window. D...Write protection notch. E...Relief Notch◎

Claims (1)

[Claims] 1. A floppy disk jacket comprising a plastic sheet lined with a non-woven liner and the area around the punched portion being cold pressed to solidify the liner fibers. 2. Cold pressing at 15-50℃, 150-300Kg/c
A floppy disk jacket according to claim 1, which is made of m^2. 3. The thickness of the nonwoven fabric liner is set to 0.05 to 0.05 by cold pressing.
The floppy disk jacket according to claim 1, which has a diameter of 0.08 mm.