JPH06210831A - Production of receiving case for recording medium - Google Patents

Abstract

PURPOSE:To efficiently and inexpensively produce a case by employing a device capable of simply applying various color designs to a part of a plastic sheet. CONSTITUTION:When a design is applied, heater blocks 14a-14d fitted with heater heads 16a-16b having design molds provided to the leading end parts thereof are used and a printing film 26 for the thermal transfer of ink is arranged between the heater heads 16a-16d and a plastic sheet 22 to be pressed by the heater heads 16a-16d to partially heat and press the surface of the plastic sheet 22. Whereupon, the pressed parts are melted to form depressions and ink is transferred to the depressions to form patterns becoming a design. When the design is changed, the design molds provided to the heads 16a-16d or the printing film 26 may be replaced. Therefore, when a multicolor printing film is used as the printing film 26, multicolor printing is enabled by one press process.

Description

Detailed Description of the Invention

[0001]

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

[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 plastic 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 mold having a punching blade and a pushing blade, punches a large number of blanks from a sheet at a time, and pushes the blanks. 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, the printing method used by a processing maker to give a plastic sheet a design is usually offset printing, gravure printing, etc., both of which require extensive equipment. . Therefore, at present, instead of printing and applying the design by the processing manufacturer, there is a method in which the original fabric manufacturer extrudes using a design forming cylinder to form unevenness and gloss difference on the sheet surface to give a design effect. It has started to take place.

According to the design forming cylinder, however, the plastic material in a molten state must be pressed while being cooled by the cylinder, and the design must be performed in a state where the physical properties of the sheet are not determined. Therefore, it is very difficult to obtain the positional accuracy of the design from the standard, and the cylinder is required to have high dimensional accuracy. Also, it is necessary to adjust the molding conditions in consideration of dimensional accuracy. Moreover, it is highly necessary to change a part of the design applied to the storage case, but even if a part of the design is changed, the expensive cylinder must be entirely replaced. Moreover, since the design is expressed by the unevenness and the difference in gloss, it is impossible to express a complicated design such as various coloring.

There are other relatively small-scale methods such as hot stamping and pad printing as methods for designing a plastic sheet, but all of them can transfer only one color at a time. In addition, in order to hide the scratches, a graining process or the like is usually performed first, but if the surface of the sheet is uneven, the transfer quality becomes poor because the pressure is uneven.

The present invention has been made in view of such conventional problems, and employs a device that can easily apply various colored designs to a part of a plastic sheet to efficiently store a storage case for a recording medium. An object is to provide a good and inexpensive manufacturing method.

[0008]

In order to achieve the above object, in the method of manufacturing a storage case for a recording medium according to the present invention, when a design is applied to a plastic sheet 22, a heater having a design mold attached to a tip end portion thereof is used. Using the heater block 14 with the head 16, the ink heat transfer printing film 26 is arranged between the heater head 16 and the plastic sheet 22, and the heater head 16 presses the ink heat transfer printing film 26 to form a plastic sheet. The step of partially heating and pressurizing the surface of 22 is adopted. At this time, it is preferable to use a multi-color printed film as the ink thermal transfer printing film 26.

[0009]

With the above-mentioned structure, when the ink heat transfer printing film 26 is pressed by the design type pressure surface 20 and is made to bite into the sheet 22 and is heated and pressed, a recess is formed in the pressed portion, and the melting occurs due to the melting. The ink is transferred to the smooth inside. Further, when the printing film for thermal ink transfer is pressed against the pressure surface of the design type and simply pressed against the sheet to be heated and pressed, the pressed portion is melted and becomes smooth, and the ink is transferred thereto. To change the design, the design mold or the ink heat transfer printing film 26 provided on the heater head 16 may be replaced. Therefore, when a multi-color printed one is used as the ink thermal transfer printing film 26, the multi-color printing can be performed in one pressing step.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view showing a process of designing a multi-sided sheet of a sleeve type storage case for a video tape cassette to which the present invention is applied, and FIG. 2 is a plan view of the multi-sided sheet. In the figure, 10 is a cylinder, 12 is an outer peripheral wall, 14 (14a, ... 14d) are four heater blocks provided at equal intervals along the arc, and 16 (16a, ... 16d) are the heater blocks. A heater head provided in each heater block 14, etc. These heads 16 have heaters 18 (18a, ... 18), respectively.
d) is built in, and the pressing surface 20 (20a, ...
0d). Moreover, each mold has a structure that allows easy replacement and adjustment of the base of the head 16. It should be noted that near the outer peripheral wall of the cylinder 10, four similar heater blocks are provided side by side with those heater blocks 14.

Reference numeral 22 is a multi-faced sheet made of plastic such as polypropylene. The multi-sided sheet 22 is a rectangular flat sheet obtained by extruding a molten plastic with a cylinder and cooling it.
For example, as shown in FIG. 2, the blanks 24 of the sleeve type storage case for a video tape cassette are sized so that six blanks can be taken. The two-dot chain line indicates each blank 2
4 shows the position of the contour line of FIG. 26 is a heater head 1
6 is a printing film for ink thermal transfer disposed between the plastic sheet 22 and the plastic sheet 22, 28 is a roll on the supply side, 30
Is a contact roll, 32 is a nip roll, and 34 is a winding side roll. The printing film 26 is arranged so that the printing surface side subjected to ink heating faces the plastic sheet 22.

In order to give a design to such a plastic sheet 22, as shown in FIG. 1, the multi-sided sheet 22 is moved leftward as indicated by an arrow and the cylinder 10 is rotated clockwise as indicated by an arrow. . At that time, heater head 1
The tip portion of 6 is lowered, and the printing film 26 for thermal ink transfer is pushed by the pressure surface 20 of the design type, bites into the sheet 22 and is heated and pressed to melt, and then the head 16 is lifted to depressurize and cool. Then, the part 3 where the pressure surface 20 is bitten
Ink is formed at 0, and the ink is transferred to the smoothed inside by the melting. Therefore, the design can be formed by the unevenness and the color, pattern, etc. of the used ink. As a matter of course, when a multi-colored print film 26 is used as the ink heat transfer printing film 26, the multi-color printing can be performed in one pressing step.

After that, the printing film 26 is moved leftward as shown by the arrow to prepare for the next designing. When the printing film for thermal ink transfer is pressed by the pressure surface of the design type, if it is heated and pressed by simply pressing it against the sheet, that portion melts and becomes smooth, and the ink is transferred to it.
The color of the ink used,
A design can be formed by a pattern or the like.

When the design is applied to the plastic sheet 22 by using the cylinder 10 in which the heater blocks 14 are arranged in a roll shape as described above, the physical properties of the sheet 22 are determined, so that the positional accuracy of the design is easily obtained and Dimensional accuracy is low, and mold manufacturing cost is low. Also, sheet 2
Since only the surface of No. 2 is melted, even a sheet having a rough surface can be used.

After designing, the sheet 22 is placed on a surface plate of a die (not shown) provided with a punching blade and a pushing blade.
6 blanks 24 are punched out at a time, and the muscles are pushed. At that time, the outer shape of each of the blanks 24 is cut along the contour line of the expanded view of the storage case and punched, and at the same time, a bending groove necessary for manufacturing is formed by pushing a muscle. The blanks 24 are put into a scissor machine, and the flaps are appropriately overlapped with each other while being bent, and both sides are formed by welding, and a notch 40 for finger hooking in the opening 38 as shown in FIG. Assembly of the sleeve type case 42 for storing the video tape cassette, which is provided with 40a, 40b), is completed.

The letters A, B, C, High Grade, etc. on the surface of the sleeve type storage case 42 show an example of a design which can be formed in the place 36 where the pressing surface 20 is bitten, with coloring omitted. . In order to change the design, it is only necessary to replace the mold portion provided on the head 16 or the print film 26 for thermal ink transfer.

FIG. 4 is a partial cross-sectional view showing a process of designing a blank of a sleeve type storage case for a video tape cassette to which the present invention is applied, and FIG. 5 is a plan view of the blank. In the figure, 44 is a flat heater block,
Reference numeral 46 is a heater head provided in the lower center part. The head 46 has a heater 48 built-in, and is provided with a design mold having a pressing surface 50 at its tip. Moreover, the mold has a structure that is easy to replace and adjust with respect to the base of the head 46.

Further, 52 is a blank as a plastic sheet, and 54 is a printing film for thermal ink transfer disposed between the head 46 and the blank 52. The blanks 52 are obtained by placing a large flat sheet which is an original warp on a surface plate of a mold provided with a punching blade and a creasing blade, punching a large number of sheets from the sheet at one time, and pushing the sheet. At that time, as shown in FIG. 5, the outer shape of each blank 52 is cut along a contour line 56 of the expanded view of the storage case and punched out, and at the same time, a groove 58 for bending which is necessary for bending is formed by pushing a muscle. Is formed. In addition, 60 is a front plate, 62 is a back plate, 64 is a bottom plate, 66 (66a, 66b) is a front side flap, 68 (68a, 68b) is a back side flap, 7
0 (70a, 70b) is an ear flap.

In order to design such a blank 52, the blank 52 is placed at a predetermined position as shown in FIG. 4, and the heater block 44 is moved downward as shown by an arrow. At that time, the printing surface 54 for thermal ink transfer is also pressed by the pressing surface 50 of the heater head 46, and the blank 5
Partially dig into the surface of 2 or simply press and heat, pressurize and melt. After that, the head 46 is lifted in the direction shown by the arrow to depressurize and cool. At the same time, the blank 52 is moved to the left as indicated by the arrow and removed. In this way, by inserting the blanks 52 having the same design into the scissoring machine and overlapping and welding predetermined portions while bending, the storage case can be assembled. In addition,
The designing may be performed on a small number of sheets on which the blanks can be removed before the blanks are formed.

[0020]

According to the present invention described above, a heater block with a heater head having a design mold attached to its tip is used, and a printing film for ink thermal transfer is arranged between the heater head and a plastic sheet. Then, press the ink heat transfer printing film with the heater head to partially heat and pressurize the surface of the plastic sheet, so that there are dents, etc. at the pressure points, transfer the ink to it, and color the unevenness, Alternatively, the design can be formed only by coloring. Moreover, since the surface of the sheet is melted when pressure is applied, it is possible to handle even a rough sheet surface.
The transfer quality is also improved. Also, to change the design, it is sufficient to replace the design mold and the printing film for ink heat transfer provided on the heater head, and it is easy to replace and adjust them.
Since the mold cost is low, it is possible to apply from simple colored designs to complex designs, and the products are cheap, making it suitable for high-mix low-volume production.

It is convenient to use a multi-colored printing film as the ink thermal transfer printing film, since the multi-color printing can be performed in one pressing step.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a process of designing a multi-sided sheet of a sleeve type storage case for a video tape cassette to which the present invention is applied.

FIG. 2 is a plan view of the same multi-sided sheet.

FIG. 3 is a perspective view showing the sleeve type storage case for the video tape cassette.

FIG. 4 is a partial cross-sectional view showing a process of designing a blank of a sleeve type storage case for a video tape cassette to which the present invention is applied.

FIG. 5 is a plan view of the blank.

[Explanation of symbols]

10 ... Cylinder 14, 44 ... Heater block 1
6, 46 ... Heater head 18, 48 ... Heater 2
0, 50 ... Pressurized surface 22 ... Multi-sided sheet 24 ... Blanks corresponding part 26, 54 ... Ink thermal transfer printing film 36 ... Pressed part 42 ... Sleeve type storage case
52 ... Blanks

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B65D 85/575 G11B 23/02 D 7201-5D 23/023 7201-5D

Claims (2)

[Claims] 1. A method of manufacturing a storage medium storage case using a plastic sheet having a design, wherein a heater block with a heater head having a design mold attached to a tip thereof is used when the design is applied. A printing film for thermal ink transfer is arranged between the heater head and the plastic sheet, and the printing film for thermal ink transfer is pushed by the heater head to partially heat and press the surface of the plastic sheet. Method for manufacturing a storage medium storage case. 2. The method for producing a storage case for a recording medium according to claim 1, wherein a multicolor printed film is used as the ink thermal transfer printing film.