JPH056760B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in a cassette for storing a floppy disk, and more particularly to a cassette that prevents short fibers from falling off a cleaning liner such as a nonwoven fabric arranged on the inner surface of the cassette. The floppy disk cassette has a structure as shown in FIG. That is, it has two thin plate-like shells 1 and 1' obtained by injection molding a plastic material such as ABS resin, and a cleaning liner 2 such as a nonwoven fabric punched into a predetermined shape is provided on the inner surface of each shell. , 2' are arranged to protect and clean the stored disks. The liners 2, 2' are partially fixed to the inner surfaces of the shells 1, 1' by spot-shaped, linear, etc. heat-sealed parts. After storing the floppy disk 3, the upper and lower shells 1, 1' are fused together to obtain a floppy disk cassette. However, conventionally, when punching the cleaning liners 2, 2' into a predetermined shape, short fiber fuzz is generated from the cut portion of the liner, and this fuzz separates from the liner when the cassette is used, causing dropouts. It was hot. The present invention effectively solves the above-mentioned drawbacks by a simple process, and its feature is that the vicinity of the cutting part of the cleaning liner is heated and pressed in advance.
The point is that the generation of fuzz and fiber waste is prevented. The present invention will be explained below based on the drawings. 2nd to 3rd
The figures are diagrams for explaining the present invention, in which FIG. 2 is a plan view of the cleaning liner material before being punched into a predetermined shape, and FIG. 3 is a plan view of the cleaning liner material after being punched into a predetermined shape. First, the liner material 2'' is formed with a heating and pressing portion 4 corresponding to the shape to be cut. This heating and pressing treatment is performed over a width of, for example, about 2 to 10 mm across the planned punching line 5. Processing conditions varies depending on the material of the liner material 2″, but
Usually, it is appropriate to carry out the heating at 150 to 300°C for about 0.2 to 2 seconds. Pressure varies depending on temperature, etc., but
~80Kg/ ^cm2 is sufficient. In addition to heat pressing, the heating and pressing treatment can also be performed using an ultrasonic heating press or a high-frequency heating press depending on the material of the liner material 2''. Next, the treated liner material 2'' is punched along the punching line 5. A liner 3 having a predetermined shape as shown in FIG. 3 is obtained by punching. This liner 3 is heated and pressed near the cut part, so the fibers are compressed and fused together and integrated, and even when cut, short fiber fuzz does not occur, and when the cassette is in use, The fibers do not come loose at all. This liner 3 is partially fixed to the inner surface of the cassettes 1, 1' by heat fusion or the like (for example, by a spot seal or a linear seal) in the same manner as in the prior art. Example A 0.2 mm thick nonwoven fabric made of 75% rayon and 25% polypropylene was used as the liner material.
The amount of chips was compared between those that were heated and pressed and those that were not. The liner material was heat pressed over a width of 5 mm at 190°C, 1 second, and 50 kg/cm ² . Then, punch out the heat-pressed part with a Thomson blade, and the outer diameter is 87.
A liner as shown in FIG. 3 with an inner diameter of 35 mm was obtained. On the other hand, as a comparative example, a liner material that was not subjected to heat-pressing treatment was punched out in the same manner as above. Then, the end of the liner was vibrated and suctioned for 5 seconds to collect chips, and the number of chips per liner was counted by length. The results are shown in Table 1.

[Table] As is clear from the above examples, the cassette of the present invention does not generate any fiber waste, and even if used for a long period of time, drop-outs caused by fiber waste will not occur.
A highly reliable floppy disk cassette can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a floppy disk cassette, FIG. 2 is a plan view showing the state before punching out the liner in the cassette of the present invention, and FIG. 3 is a plan view showing the state after punching. 1, 1'...Cassette shell, 2, 2'...Cleaning liner, 3...Floppy disk, 4...Heating and pressing section.

Claims (1)

[Claims] 1. A floppy disk cassette characterized in that a cleaning liner whose portion near the cut end is heated and pressed is disposed on the inner surface of the cassette, and the liner is partially fixed to the inner surface of the cassette.