JPS61175984A - Production of disk jacket - Google Patents

Abstract

PURPOSE:To simplify a stage by laminating thermally and simultaneously a non-woven or woven fabric to a sheet in the stage of forming the sheet. CONSTITUTION:Pellets formed by incorporating 20wt% carbon black to PP and subjecting the same to master batching are extruded by an ordinary extruder and are sheeted by a T-die. The non-woven fabric (rayon + 20% PP) is thermally laminated on the sheet. The sheet obtd. in such a manner is blanked to an outside shape shown in the figure and after the blankerd sheet is bent along the dotted line near the center, a center hole is blanked to the sheet. A separately produced floppy disk is put into the resulted floppy disk jacket. Since the sheet itself is thermally laminated with the non-woven babric in the above-mentioned manner, the stage for adhering the non-woven fabric to the sheet is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a jacket for covering a disc, such as a floppy disc jacket, a compact disc jacket, or a video disc jacket.

[Conventional technology]

As is already known, the number of disk jackets for floppy disks, etc. is rapidly increasing as the number of computers increases.

Currently, the jacket of this floppy disk is mainly made of polyvinyl chloride sheet (2) which has been made conductive. B. S (acrylic butadiene styrene copolymer) is also used, and in this case the same (conductivity is imparted).Furthermore, a non-woven fabric is thermally bonded to the inside of the jacket to protect the floppy disk. The form is as shown in Figure 1 C.The size of the floppy disk is often 3.5 inches x 3 inches.The jacket of this floppy disk is made from a sheet as shown in Figure 1 (= There are two types of floppy disks: molded and injection molded. In either method, the nonwoven fabric used to protect the floppy disk is made by cutting out doughnuts and hot-bonding them.

However, currently it is not possible to thermally bond this nonwoven fabric afterwards.
Currently, the process is very complicated and the complexity of the process increases the cost of the jacket. Furthermore, the conventional specifications have the disadvantage that sufficient display effects and functionality cannot be provided.

[Problem that the invention seeks to solve]

The purpose of the present invention is to improve the drawbacks of the conventional disc jacket manufacturing method described above, simplify the manufacturing process,
At the same time, it is necessary to reduce costs.Furthermore, it is necessary to improve the display effect and make it easier for users to use.

Structure of the Invention [Means for Solving the Problems] The present invention provides a floppy disk jacket. Second, the nonwoven fabric is thermally laminated at the same time as the sheet is formed, thereby simplifying the process and reducing costs.

Furthermore, by making the outside of the seat a different color from the inside, the inner surface of the jacket is red, the outer surface is black, etc., which increases the display effect (-) and makes it easier for the user to use. be.

Next (=, we will specifically explain the manufacturing method and the floppy disk jacket.

A method of thermally laminating the nonwoven fabric mentioned above will be explained. Generally, resins used as raw sheets for extrusion film formation include olefin resins such as polyethylene and polypropylene, as well as polystyrene, acrylic-butadiene-styrene copolymers, acrylic-styrene copolymers, and thermoplastics such as polyvinyl chloride. All resins are effective. In addition, carbon black, to impart conductivity,
In addition to graphite, iron and stainless steel.

Metal particles such as stainless steel, copper, chromium, titanium, tungsten, boron, nickel, cobalt, aluminum, zinc, nichrome, metal-plated non-metal particles, stannic oxide, silver oxide, metal hosker, carbon fiber, glass fiber It is possible to mix metal coating materials, etc.

When the thermoplastic resin mixed with these is molded into a sheet-like product through a T-die in an extruder, a nonwoven fabric or a woven fabric is simultaneously thermally laminated. The process is shown in Figures 1 and 3.
As shown in the figure. As shown in FIGS. 2 and 3, the resin extruded from the die is thermally laminated with a nonwoven fabric or woven fabric and thermally fused while passing through rolls 6, g, or 6, g, g.

At this time, by appropriately widening the distance between the rolls 6, 7 and 6, it is possible to prevent the thermal lamination of the sheet and the nonwoven fabric or woven fabric (=therefore, curling that is likely to occur).

In addition, it is important to sheet the sheets so that they do not warp, and if necessary, take them in single sheets and stack them at 60 to 100 degrees Celsius and age them to remove the warpage. Sometimes we take measures.

The sheet thus produced is cut out into the shape shown in FIG. 1, a floppy disk is inserted into the sheet, and then the sheet is packaged.

[Effect]

The present invention aims to simplify the process and reduce costs by simultaneously thermally laminating nonwoven fabrics or textiles during sheet film formation in the production of floppy disk jackets. This is what we are trying to measure.

Furthermore, by making the outside of the sheet a different color from the inside, such as black on the inside and red on the outside, the display effect can be improved and the user can use it more easily.

[Examples] Example 1 A pellet obtained by mixing 20% by weight of carbon black into polypropylene to form a master patch was extruded using a conventional extruder and sheeted using a T-die. The thickness of the sheet is 0.2fi.

At the same time, a nonwoven fabric (rayon/polypropylene (20%)) was thermally laminated as shown in Figure 1. At this time, the basis weight of the nonwoven fabric was ysg71z. Also, the volume electrical resistivity of the sheet sheeted from the T-die is /0? It was Ω. At this time, the sheet was taken in two zeta sheets to prevent it from warping, and the sheet was stacked and aged at goC to remove the warp.

The sheet thus obtained is punched out into the shape shown in FIG. Next, the sheet punched out in this way is punched along the dotted line near the center in Figure 1, bent, and then punched with a center hole. (The manufactured floppy disk is inserted. From this step onwards, the jacket performance is inspected, the second is sealed, a label is applied, and other processing is performed before being shipped. Since the sheet itself is thermally laminated with a nonwoven fabric, the process of applying the nonwoven fabric to the sheet is simplified.

Example Pellets prepared by mixing 20% by weight of carbon black into copolypropylene to form a master patch were extruded using a conventional extruder and sheeted using a T-die. The thickness of the sheet is 0.21 m.

At the same time, a red cotton fabric was thermally laminated as shown in Figure 1. At this time, the basis weight of the cotton fabric is 3K.
11/rr? Met. Also, the volume electrical resistivity of the sheet sheeted from the T-die is /07Ωα
Met. At this time, in order to prevent the sheet from warping (it was taken in two sheets and aged at 10°C in layers to remove the warp), in Figure 2, the space between the rolls 6 and 7 was appropriately widened (=Therefore, curling caused by thermal lamination of the sheet and offal was prevented.

The sheet obtained in this way is punched out to have an external shape (-) as shown in Figure 1. Next, the sheet punched out in this way is folded along the dotted line near the center of Figure 1, and then , the center hole is removed.A separately manufactured floppy disk is placed inside the floppy disk jacket obtained in this way.After this step,
As before, the jacket is inspected for performance, end-sealed, labeled, and then shipped. In this way, since the fabric is thermally laminated to the sheet itself, the process of attaching the sheet (two fabrics) is simplified.

Furthermore, since the inner fabric of the jacket is red and the outer sheet is black, it has a different color structure, which has the advantage of increasing the display effect and making it easier for the user to use.

Example 3 Pellets made by mixing 23% by weight of carbon black into polypropylene to form a master patch were extruded using a conventional extruder and sheeted using a T-die (two-way sheeting. The thickness of the sheet was 0.2 xx).

At the same time, as shown in Figure 3 (2), the nonwoven fabric 10 was pulled out from under the roll B, and the roll was made into an enbonne roll. It was thermally laminated with the nonwoven fabric lθ while applying the following steps.

At this time, the basis weight of the nonwoven fabric is 3! r g/m.

The nonwoven fabric is a blend of rayon and polypropylene. In addition, the volume electrical resistivity of the sheet sheeted from the die was t (7?Ω2). The sheet was stacked and aged at 100° C. to remove warpage.In addition, in FIG. 3, the distance between the rolls 6 and 6 was appropriately widened to prevent curling caused by thermal lamination of the sheet and the fabric.

The sheet thus obtained is punched out into the shape shown in FIG. Next, the sheet punched out in this way is bent along the dotted line near the center in Figure 1, and then a center hole is punched out. 2.The manufactured floppy disk is inserted.After this process, the jacket performance is inspected as usual, the end is sealed, a label is applied, and other processing is performed before being shipped.In this way, the sheet itself Since the nonwoven fabric is thermally laminated on the sheet, the process of applying the nonwoven fabric to the sheet is simplified.

Furthermore, since the nonwoven fabric on the inner surface of the jacket is white and the outer sheet is black and embossed, it has the advantage of excellent display effects and ease of use for the user.

〔Effect of the invention〕

The disc jacket manufacturing method of the present invention has the configuration as described above, and by using this method, the manufacturing process can be simplified and costs can be reduced at the same time. Furthermore, it is possible to improve the display effect and make it easier for the user to use.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the inner surface of a floppy disk jacket manufactured by the present invention or a conventional floppy disk jacket manufacturing method. FIGS. 2 and 3 are diagrams showing the process of thermally laminating a sheet and a nonwoven fabric or fabric in the method for manufacturing a floppy disk jacket of the present invention. l: Inner surface of the floppy disk jacket 2: Nonwoven fabric or Part where fabrics are glued together -': Non-woven fabric or woven fabric 3: Floppy disc: Thermoplastic sheet S: Die 6.7, g, ?: Rolling: Embossing roll 10: Winding of non-woven fabric or woven fabric Patent applicant Dai Nippon Printing Agent Co., Ltd. Patent Attorney Atsushi Konishi Figure 1 Figure 2 Figure 3

Claims (12)

[Claims] (1) At the same time as extruding at least one layer of sheet, thermally laminate a nonwoven fabric or fabric on one side of the sheet, and then punch it into the required shape with the nonwoven fabric or fabric side becoming the inner surface of the disc jacket. A method for manufacturing a disc jacket characterized by the following. (2) The method for manufacturing a disk jacket according to claim 1, wherein when the sheet is one layer, the sheet is electrically conductive. (3) When the sheet has two or more layers, at least the sheet on the nonwoven fabric side or the woven fabric side is electrically conductive, and the other sheets are electrically conductive or non-conductive. A method of manufacturing disc jackets. (4) The method for manufacturing a disk jacket according to claim 2 or 3, wherein the conductive sheet is produced by mixing a conductive substance into a thermoplastic resin. (5) Manufacture of a disk jacket according to claim 4, wherein the thermoplastic resin is polyethylene, polypropylene, polystyrene, acrylic-butadiene-styrene copolymer, acrylic-styrene copolymer, polyvinyl chloride, or the like. Method. (6) In addition to carbon black and graphite, conductive substances include metal particles such as iron, stainless steel, copper, chromium, titanium, tungsten, boron, nickel, cobalt, aluminum, zinc, and nichrome, and metal-plated nonmetal particles; 5. The method of manufacturing a disk jacket according to claim 4, wherein the material is stannic oxide, silver oxide, metal hosker, carbon fiber, metal coating material for glass fiber, or the like. (7) The method for manufacturing a disk jacket according to claim 3, wherein the non-conductive sheet is made of a thermoplastic resin. (8) Manufacture of a disk jacket according to claim 7, wherein the thermoplastic resin is polyethylene, polypropylene, polystyrene, acrylic butadiene styrene copolymer, acrylic styrene copolymer, polyvinyl chloride, or the like. Method. (9) The volume electrical resistivity of the conductive sheet is 1×10^1^
A method for manufacturing a disk jacket according to claims 2, 3, and 4, characterized in that the resistance is 4 Ωcm or less. (10) When the sheet has one or more layers, the color of the nonwoven fabric or fabric is different from the color of the outermost sheet opposite to the nonwoven fabric or fabric side.
2. Method of manufacturing a disc jacket. (11) Nonwoven fabrics are made by arranging cotton, rayon, acetate, polyester fibers, nylon, polypropylene, vinylon, and other acrylic fibers in a web-like (thin cotton-like) or mat-like form using an appropriate method, using the adhesive or the fusing strength of the fibers themselves. The method for manufacturing a disk jacket according to claim 1, wherein the disk jacket is in the form of a sheet obtained by bonding fibers together. (12) The fabric must be woven from cotton, rayon, acetate, nylon, polyester, vinylon, polyvinyl chloride, polypropylene, saran, or other fibers based on plain weave, twill weave, or satin weave. A method for manufacturing a disk jacket according to claim 1, characterized in that: