JPH06198736A - Design for recording medium storage case, manufacture of stripe forming cylinder - Google Patents

Abstract

PURPOSE:To make a design and a stripe-press line simultaneously on a plane sheet as a raw material of a recording medium storage case at the time of extrusion molding. CONSTITUTION:A groove or a hole 8 is formed in the body of a cylinder 10 which molds by extruding molten plastic a plane sheet as a raw material of a recording medium storage case. The base 22 of a stripe press blade 20 is inserted into the groove or the hole to be fixed there. In this way, the cylinder 10 can be easily equipped with a projection 12 for design making and others.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a design of a storage case for a recording medium such as a tape cassette and a floppy disk, and a method for manufacturing a streak forming cylinder.

[0002]

2. Description of the Related Art Conventionally, when a recording medium such as a magnetic tape is dusted or scratched on its surface, the recording is lost and erroneous recording or erroneous display is performed. Therefore, when not in use, a tape cassette for audio and video, a floppy disk or the like is stored in a case made of plastic, paper or the like for protection.

[0003] As such a storage case, for example, when assembling a plastic sleeve type storage case,
First, a raw material manufacturer extrudes a molten plastic with a cylinder to form a large square or rectangular flat sheet. This sheet is shipped to the processing manufacturer. A processing maker prints a design or the like on one side, and then places it on a surface plate of a die having a punching blade and a pushing blade, punches a large number of blanks from a flat sheet at one time, and pushes them. At that time, the outer shape of each blank is cut along the contour line of the expanded view of the storage case and punched, and at the same time, a groove for bending necessary for manufacturing is formed by pushing a muscle. The storage case can be assembled by placing the blanks in a scissor making machine and stacking and welding predetermined portions while bending them.

[0004]

However, if the original flat sheet is transported from the original fabric manufacturer to the processing manufacturer and processed as described above, the number of steps is large and the transportation cost is high. Leading to higher costs. Therefore, at present, there is a method of forming a difference in roughness on the surface of a sheet to give a design effect by extruding a raw fabric manufacturer by using a design forming cylinder instead of printing and applying the design by a processing maker. Has been done.

Certainly, according to this method, the processing maker does not print, so that one processing step is reduced. However, not only does the burden required for transportation not change much, but once a design is applied at the time of forming the original fabric, the design is a special one that differs from manufacturer to manufacturer. I have to take it. Therefore, it is conceivable that not only the design is applied at the time of extrusion molding, but also the blanks are formed by further performing scoring and punching. To perform muscle pushing, a cylinder having a muscle pushing blade may be used.

0.3 mm in the body of such a cylinder
As a method of providing the above-mentioned muscle pushing blade, there are methods of milling (cutting) processing and corrosion processing. In either case, the roll is either scraped or carved to increase the height of the muscle pressing blade.
However, with these methods, the low roll portion (the portion other than the ridge pushing blade) does not become an uneven surface that can be designed on the surface of the sheet and becomes rough. In addition, even if an attempt is made to finish the portion so that it is uneven, it cannot be done because of the piercing blade. Therefore, there is an inconvenience that it is not possible to perform design molding and scoring with the same cylinder.

The present invention has been made by paying attention to such a conventional problem, and at the time of extrusion molding of a flat sheet which is a material of a storage case for a recording medium, a design and a muscle pushing line are simultaneously formed on the sheet. An object is to provide a method for manufacturing a cylinder that can be applied.

[0008]

In order to achieve the above object, in the design of the storage case for a recording medium and the method for manufacturing a streak forming cylinder according to the present invention, a molten plastic material is extruded to form a storage case for a recording medium. Grooves or holes 1 in the body of the cylinder 10 for forming the flat sheet as the material
8 is provided, and the base portion 22 of the muscle pushing blade 20 is inserted therein and attached.

[0009]

With the above structure, the body of the cylinder 10 is provided with a groove or hole 18 in which the base portion 2 of the muscle pressing blade 20 is provided.
When 2 is inserted and installed, design forming projections 12 and the like are first provided at predetermined locations of the body of the cylinder 10 by milling processing, corrosion processing, etc., and later, grooves or holes 18 are provided at other predetermined locations, and creases are made there. Since the base portion 22 of the blade 20 can be inserted and mounted, the design 34 and the muscle pushing line 36 can be applied at the same time when the flat sheet that is the material of the recording medium storage case is formed.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a main part showing the design of a storage case for a recording medium to which the present invention is applied and the features of the structure of a streak forming cylinder. In the figure, 10 is a design, a streak forming cylinder, 12 is an embossing projection provided on the body surface, 1
Reference numeral 4 is a mirror surface forming projection, and 16 is a muscle pressing blade mounting base forming projection. Further, reference numeral 18 is a groove or hole provided in the projection for mounting the muscular push blade mounting base 16, and 20 is a muscular push blade fitted with the base portion 22 inserted into the groove or hole 18.

In order to manufacture such a design and streak forming cylinder 10, first, masking is performed on the surface of the body of the cylinder 10 where the mirror surface forming projection 14 and the streak blade mounting base forming projection 16 are provided. Next, corrosion processing is performed. Then, as shown in FIG. 2, the embossing protrusion 1 for forming a design is formed on other portions except the portion covered with the masking 24.
2 can be provided.

Next, the masking 24 is removed, and as shown in FIG. 3, a groove or hole 18 into which the base portion 22 of the muscle pressing blade 18 is inserted is provided in the central portion of the muscle pressing blade mounting base forming projection 16. When the embossing molding projections 12 are formed by the milling processing, the masking 24 is not required because the cutting processing may be performed except the portions where the mirror surface molding projections 14, the ridge presser mounting table molding projections 16 and the like are provided.

In this way, when the design and the body of the streak forming cylinder are provided with the groove for mounting the streak pressing blade of the sleeve type storage case for the video tape cassette, for example, as shown in FIG. In the figure, 26 is a design, a streak forming cylinder, 28
Is a groove for attaching a pushing blade, which is provided in the center of the surface of the body,
Is the axis of rotation. It should be noted that, in the drawing, the embossing molding projections and the mirror surface molding projections are omitted. Next, as shown in FIG. 5, with respect to the groove 28, the muscle pushing blade 3 previously manufactured
2 is attached and the design and the streak forming cylinder 26 are completed.

At the time of molding, a molten plastic such as polypropylene resin is extruded into a flat plate shape from a T die (not shown) attached to the outlet of the molding machine, and a design and an embossing roll (not shown) paired with the streak forming cylinder 26 are formed. A flat sheet is formed through the space. At this time, if the design, the streak forming cylinder 26 is provided with TDK character forming projections (not shown), etc., the design 34 and the press line 36 as shown in FIG. Moreover, the back surface of the flat sheet can be embossed on the entire surface by an embossing roll. In addition, a groove for deep bending is formed on the surface as the muscle pushing line 36.

Further, a cylinder (not shown) provided with a punching blade is installed behind the design and streak forming cylinder 26. Then, after the flat sheet is formed, the design is imparted, and the lines are pressed in the integrated process, the flat sheet is punched out, and the blanks 38 as shown in FIG. 7 can be efficiently manufactured. The pressure roller paired with the punching cylinder is provided with a recess at a position facing the punching blade.

The blanks 38 are put into a scissor machine, and the corresponding flaps are appropriately overlapped with each other while being bent and welded to form both side surfaces, whereby the assembly of the sleeve type case for storing the video tape cassette is completed. . In addition, 40 is a top plate, 42 is a bottom plate, 44 is a back plate, 46
(46a, 46b) are front side flaps, 48 (48a,
48b) is a back side flap and 50 (50b, 50b) is an ear flap.

FIG. 8 is a perspective view showing another design, a streak forming cylinder, in which another streak blade mounting hole of a sleeve type storage case for a video tape cassette to which the present invention is applied is provided. In the figure, reference numeral 52 is a design, a streak forming cylinder, 54 is a pusher blade mounting hole provided at the center of the body surface, and 56 is a rotating shaft. The muscle pushing blade mounting holes 54 are provided by appropriately distributing a number along the portions corresponding to the muscle pushing blade mounting grooves 28 in the above-described embodiment.

[0018]

According to the present invention described above, a groove or a hole is provided in the body of the cylinder, and the base of the muscle pushing blade is inserted therein to be mounted, so that it is easy to give design molding protrusions or the like to other places, When a flat sheet, which is a material for a storage case for a recording medium, is extrusion-molded, the sheet can be simultaneously subjected to design and muscle pushing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing the design of a storage medium storage case to which the present invention is applied and the features of the structure of a streak forming cylinder.

FIG. 2 is a cross-sectional view of an essential part showing a state in which embossed molding projections are formed by a corroborative design and a corroding process of a muscle forming cylinder.

FIG. 3 is a cross-sectional view of an essential part showing a state in which a groove for forming a scoring blade or a hole for forming a muscular forming cylinder is formed.

FIG. 4 is a perspective view showing a design, a streak forming cylinder provided with a streak blade mounting groove of a sleeve type storage case for a video tape cassette to which the present invention is applied.

FIG. 5 is a perspective view showing a state in which a muscle pressing blade is attached to a groove of a synonymous design and a muscle forming cylinder.

FIG. 6 is a view showing a design and a muscle pushing line applied to a flat sheet by an agreed design and a strip forming cylinder.

FIG. 7 is a plan view showing blanks punched from a flat sheet by a punching cylinder installed in the rear of a synonymous design and a streak forming cylinder.

FIG. 8 is a design of another sleeve type storage case for a video tape cassette to which the present invention is applied, which is provided with a groove for pushing a brace.
It is a perspective view showing a muscle forming cylinder.

[Explanation of symbols]

10, 26, 52 ... Design, muscle forming cylinder 12 ... Embossing molding protrusion 14 ... Mirror surface molding protrusion 16 ... Muscle pressing blade mounting table protrusion 18, 28, 54 ... Muscle pressing blade mounting groove or hole 20, 32 ... Muscle pressing blade 22 ... Base 24 ... Masking 30, 56 ... Rotating shaft 34 ... Design 36 ... Muscle pushing line 38 ... Blanks

Claims (1)

[Claims] 1. A groove or hole is provided in a body of a cylinder for extruding a molten plastic material to form a flat sheet which is a material for a storage case for a recording medium, and a base of a muscle pressing blade is inserted thereinto for mounting. Of a storage medium storage case, and a method for manufacturing a streak forming cylinder.