JPS6139278A - Manufacture of jacket for flexible disc - Google Patents

Abstract

PURPOSE:To prevent a fault such as dropout from taking place to a flexible disc even after the use for a long period by giving an opening larger than each window to a liner, sticking it with a strip sheet and punching the sheet so as to have a prescribed profile and various windows. CONSTITUTION:The linear raw member 10 is punched out by a cutter formed corresponding to a peripheral face of a roll 5 so that a continuous opening 30 including a profile of the sheet 25 and various windows is formed. In this case, the size of the continuous opening 301 is made slightly larger than the windows 21-23 of the sheet 25 of final jacket. The linear 30 is molten thernally to the sheet member via lots of dotted thermal melting part 31 and the sheet 25 having each opening for the windows 21-23 and the profile provided with a flap 201 is punched out by the roll 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a jacket for a flexible disk used for an external storage medium such as a computer.

As is well known, this type of flexible disk jacket is made of a laminated material consisting of a sheet made of vinyl chloride resin, etc., and a liner made of nonwoven fabric, etc., adhered to the inner surface of the sheet. It is formed by folding it into an envelope shape having a predetermined shape as a liner inner surface, and its structure is as specified in JIS C6290 and C6291.

That is, this type of jacket has flaps 20. as shown in FIG. 5 of the accompanying drawings. A central window 21. having a predetermined external contour with a central window 21. for the required drive shaft insertion. Head window 22 for inserting the recording/reproducing head. Various 8! such as index window 23 for positioning! ! A sheet 25 made of polyvinyl chloride resin or the like with functional openings formed thereon, and a corresponding external contour and various openings 21 to 25 of the sheet 25 thermally bonded thereon.
23, etc., the opening portion 21. ．． 22.
．． 23. Liner 3 made of non-woven fabric etc.
As shown in FIG. 6, a laminated sheet material 40 consisting of
Fold the sheet 25 with the two opposing 7 laps 20.0 inward. are joined to the outer surface of the facing sheet 25 to form a substantially square envelope shape with an opening 24 on the - side, the flexible disk 50 is inserted through this opening 24, and the remaining seven laps 201 are attached to the sheet. (See Figure 7)
.

According to a conventional general manufacturing method for a jacket for a flexible disk having such a configuration, the sheet 2
After the liner 30 is attached to the sheet 25, the outer shape of the sheet 25 is punched out into a roughly rectangular outline having 7 adhesive wraps 20+, and various windows 21, 22, 23, etc. are cut into the sheet 25. After simultaneously punching out the required openings in both the liner 30 and the sheet 25, the sheet 25 is folded into an envelope shape and the flaps 20° previously formed by punching on both sides of the sheet 25 are inserted into the sheet 25. It is common practice to form a jacket by gluing it onto the body of a. However, in this case, during continuous production, the cutting die became dull and the fibers of the liner 30 gradually frayed and became loose.

In order to prevent such public fish, Patent No. 1.1 has already been proposed.
No. 10,926, it is also known to use a slitter wheel and shape the liner so that it does not lie on the edge of the jacket's head window and then laminate it to the sheet. According to this method, the liner is cut off more than necessary, which reduces the cleaning effect of the liner on the flexible disk.

[The present invention aims to eliminate the above-mentioned drawbacks of conventionally commonly used manufacturing methods, and at the same time eliminate the above-mentioned drawbacks of improved methods that have already been proposed. The purpose of the present invention is to obtain a new manufacturing method for a flexible disk jacket that can be used in a flexible disk. In this case, before it is fitted to the sheet, it is pre-punched to have a continuous opening that envelops the outer contour of the liner and the various twin windows; Rather than enveloping it, leave an opening that continuously envelops it in a slightly larger outline, and then cut it out like this,
The sheet material for the flexible disk jacket is formed by laminating the liner liner to a strip sheet that has not yet been cut out to a predetermined shape, and then punching the sheet to have a predetermined external contour and various windows. Furthermore, the present invention is characterized in that the laminated sheet material is folded into a predetermined shape.

In the following, the present invention will be explained based on FIGS. 11 to 4 showing one embodiment thereof.

First, FIG. 1 shows one embodiment of an apparatus for carrying out the method according to the present invention. Hereinafter, the manner of carrying out the method of the present invention will be explained based on this apparatus.

As shown in Fig. 1, this device consists of a liner feeding device 1 consisting of a roll for winding up a continuous liner material 1° made of nonwoven fabric, etc., and a liner feeding device 1 consisting of a roll for winding up a continuous liner material 1° made of non-woven fabric, etc. It is composed of a sheet feeding device 2 consisting of a roll for winding a continuous sheet material 2°, and each device 1, 2 has a liner material 1° and a sheet material 2°. , respectively, are continuously paid out at a constant speed in a known manner. First, two liner cables 1° made of non-woven fabric etc., which are continuously paid out from a liner feeding device 1, are fed out from several guide rolls 3. , 4 to the liner punching roll 5.
A cutter member correspondingly formed on the outer circumferential surface of the roll 5 allows a continuous opening 30 to enclose the outer contour of the sheet 25 and the various windows. is punched out to form a liner material of 1°, forming a liner 3o as shown in FIG.
are punched out at regular intervals. In this case, the dimensions of the continuous envelope opening 301 shall be punched out in such a shape that it is slightly larger than each window 21, 22, 23, etc. of the sheet 25 of the final jacket. Further, a vacuum roll 6 is disposed below the punching roll 5, and the suction action of the vacuum roll 6 sucks the liner 3° punched by the liner punching roll 5, and removes the liner 3°. vacuum roll 6
Send it to the bottom area. At this time, the sheet material 2° from the sheet feeding device 2 is placed on the lower side of the vacuum roll 6.
The sheet material 2° is continuously fed out through each guide roll 7.8, and static electricity is applied in advance to the sheet material 2° by an electrostatic voltage application device 7 installed below the bottom periphery of the vacuum roll 6. As shown in FIG. The liner 30 that has been sent to the lower periphery is sucked and placed. In this case, a suitably large number of holes with a diameter of about 1 to 2111111 are provided as suction parts in the peripheral wall of the vacuum roll 6, but by appropriately configuring the inside of the vacuum roll 6, , liner material I. However, the suction action is realized only within the range from the part in contact with the two-dimensional punching roll 5 to the part in contact with the sheet material 2°, and the liner 30 is shall be placed smoothly on the sheet material 2° due to its static electricity.

In this way, the sheet material 2° with the liner 30 placed thereon is then conveyed between a pair of heat rolls 10 and a cooling roll 11 arranged one above the other, and here,
The liner 30 is heat-sealed to the sheet material 2o via a large number of dot-shaped heat-sealing parts 31 (see FIG. 3).
is configured to allow cooling water to pass therethrough, and functions to prevent excessive temperature rise of the heat roll 10 and to prevent excess heat from being applied to the sheet material 2°. The contour of the heat-sealed portion 31 between the liner 30 and the sheet material 2 is, for example, as shown in FIG. 4, by making it circular in cross section. Therefore, there is no need to apply excessive heat to the sheet material 2°, and as a result, it is possible to prevent the sheet material 2° from being distorted or deformed. Thereafter, the sheet material 2° having the liner 30 heat-sealed in this manner is transported between a pair of sheet punching rolls 12, and these rolls 12 form 72 pieces 20 as shown in FIG. ．．
, and each predetermined window 21, 22 .
A sheet 25 with respective openings for 23 etc. is punched out and finally deposited as a laminated sheet material 40 in a storage box 14 via a pair of guide rolls 13. The laminated sheet material 40 thus formed is processed into a jacket as shown in FIG. 6 in a separate process.

Note that FIG. 1 shows a heat roll 10 and a cooling roll 1.
It is also shown that a static eliminator 15 for removing static electricity from the sheet material 2 is disposed behind the sheet material 2 .

Here, to give examples of various materials used in the method of the present invention and examples of their thermal fusion temperatures, the liner cable material 1
,. Examples of the material include a rayon-polypropylene nonwoven fabric sheet, and examples of the sheet material 2 are a hard vinyl chloride resin sheet.Furthermore, the surface temperature of the heat roll 10 is 260# to 2.
80'C is suitable, and line speeds under such conditions can achieve high speeds such as 80 to 100 sheets/min. This speed can be set very high (approximately 5 times or more) compared to the conventional method.

As described above, according to the present invention, the various drawbacks mentioned above in the conventionally known manufacturing methods can be overcome, and in addition, it is possible to solve Since the openings are continuous and enveloping, it is possible to provide some margin for alignment between the liner and the sheet.At the same time, the punched holes in the liner are larger than the punched holes in the jacket. Even after using the flexible disk for a long time, the fibers that make up the nonwoven fabric become frayed and the fibers protrude into each window area of the sheet. , 7 lexiple disks, which can effectively prevent defects such as dropouts, and also have the effect of extremely high productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is an exploded view showing an example of a liner placed on a sheet material in an intermediate step of the method of the present invention. figure,
FIG. 3 is a plan view of a laminated sheet material composed of a sheet and a liner manufactured by the method of the present invention, viewed from the liner side, and FIG. Fig. 5 is an enlarged view of the heat-sealed part with the liner; Fig. 5 is an exploded view of an example of a conventionally known 7 flexible disk jacket, with the liner facing upward; Fig. 6 is a developed view of the flexible disk jacket. a plan view showing the flexible disk in a state before insertion;
FIG. 7 is a plan view showing the flexible disk jacket with a built-in flexible disk. DESCRIPTION OF SYMBOLS 1... Liner feeding device, 2... Sheet feeding device, 3, 4.7, 8.13... Guide roll, 5... Liner punching roll, 6... Vacuum roll, 7... Electrostatic voltage application device, 10... Heat roll, 11... Cooling roll, 12... Sheet punching roll, 14... Storage box, 15...
- Static eliminator, 25... Sheet, 30... Liner, 40... Laminated sheet material. Patent applicant Nippon Wavelock Co., Ltd. Figure 1 ± Figure 2

Claims (1)

[Claims] 1. A sheet made of vinyl chloride resin or the like having a predetermined external contour and having openings for the various required windows, and a substantially corresponding sheet glued thereon; A method for manufacturing a jacket for a flexible disk comprising an outer contour and a liner made of perforated non-woven fabric, etc., in which the liner and the sheet are each continuous strip-shaped material that runs continuously in the same direction at a constant speed. First, liners having predetermined external contours and openings are continuously punched out from the liner material at regular intervals during its running, and each liner thus punched is sequentially stamped onto the continuously running sheet material. The sheet material is then punched out into a sheet having a predetermined external contour and a required opening, and then the sheet material is then bonded to each other in this way and each punched into a predetermined shape. 1. A method for manufacturing a jacket for a flexible disk, comprising folding and gluing a laminated sheet material consisting of a sheet and a liner into an envelope-shaped jacket having a predetermined shape. 2. The method for manufacturing a jacket for a flexible disk according to claim 1, wherein the liner is provided with an opening that encloses each window of the sheet with a certain margin. 3. Manufacture of a jacket for a flexible disk according to claim 1 or 2, wherein the thermally bonded portion between the liner and the sheet is formed by a number of annular point portions having a circular cross section. Method.