JPH0427828Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a storage box for magnetic recording media for storing magnetic recording products such as magnetic tape cassettes, floppies, etc.

BACKGROUND ART Conventionally, magnetic tape cassettes, floppies, and the like have been widely used as magnetic recording media that can be attached to a drive device (magnetic recording/reproducing device) or removed for storage or transportation. These magnetic tape cassettes and floppies contain magnetic tapes, magnetic disks, etc., respectively. If dust or scratches are applied to the surface of these magnetic recording media, signal defects may occur during recording or reproduction, resulting in a significant decline in functionality. Therefore, when not in use, magnetic tape cassettes and floppies are stored in boxes to protect them. Before such a storage box reaches the consumer, it protects the stored magnetic tape cassettes, etc. from transportation and storage, and after the consumer has purchased them, they can be put in and taken out for use. Therefore, the configuration has been designed with further consideration given to operability. The material used for these boxes is not only paper, but also plastic, just like other boxes. This plastic storage box has a blank (the base plate of the box).
Another method uses a plastic substrate (substrate), and its outer surface is treated to make it opaque by printing grid patterns, colored stripes, trademarks, symbols, etc., except for transparent windows that serve as see-through points. To obtain such a blank, there are two main steps: manufacturing the original fabric from molten plastic (first step);
The process of printing on sheets of plastic, for example, 1 m ² in size (second step), the step of punching out and stamping each printed sheet, and stamping with a hot stamp (third step) process) etc. Therefore, the final step is the box-making process in which the blanks are folded into the shape of a storage box and assembled. Note that there is an aging period of several days between the first step and the second step, and between the second step and the third step. Normally, each of these processes is divided among independent specialized companies, and each product is manufactured and transported in sequence, until the storage box is completed.

Problems to be Solved by the Invention However, since such blanks are printed on one side, which is the outer surface of the storage box, printing on the sheet-cut plastic material, especially the selection of ink, is important. This is because the printed ink layer comes into direct contact with the outside air, so the influence of this must be fully taken into consideration. Therefore,
Previously, expensive thermosetting inks with excellent heat resistance and abrasion resistance were used. Further, if the printing surface is directly transferred to the next step after printing, the printing surface will be stained with ink, so a protective layer 10 is provided by applying varnish on top of the printing surface as shown in FIG. In addition, in the figure, 1
2 is a plastic material, 14 is a printed layer, 16 is a foil layer formed by hot stamping, and 18 is an embossed surface. Still, when blanks are stacked thickly, the pressure increases considerably, so blocking, where printing ink sticks to the surface of other blanks, cannot be avoided. Therefore, ink selection and sufficient consideration to blocking are essential. Note that both the aging after the first step and the aging after the second step that have been conventionally performed are due to the use of thermosetting ink. That is, the aging after the first step is to suppress the shape change and expansion/contraction of the dimensions of the original fabric against the heat treatment for drying and curing in the second printing step, and to obtain a highly accurate printing finish. Furthermore, in the aging after the second step, it is necessary to spend sufficient time to form and fix the printing ink and surface protective layer more firmly and to prevent the ink from peeling off.

Moreover, since the sheet-printed plastic material is thick, it is more rigid than a thin material that can be rolled into a roll, and its adhesion to the plate surface with ink is poorer, so uneven printing is more likely to occur. It is difficult to achieve good print clarity and brightness. Furthermore, since printing is performed on each sheet, it is not suitable for mass production.

The present invention has been developed by focusing on these conventional problems, and allows for easy selection of ink and does not require consideration of blocking. Moreover, it is an object of the present invention to provide a storage box for magnetic recording media that has a good printing finish and is made of inexpensive blanks.

Means for Solving the Problems Means for achieving the above object will be described below with reference to FIG. 1, which corresponds to an embodiment.

A blank for assembling this storage box for magnetic recording media is produced using a laminated structure in which a printed plastic film 56 is adhered to one surface of a plastic raw material 36. Furthermore, by adhering the printed surface of the plastic film 56 to one surface of the plastic raw material 36, a printed layer 76 is included inside the laminated structure.

Effect The above means works as follows.

When a blank is produced by thermally adhering a printed plastic film 56 made of the same material as the original film to one side of the original plastic film, and using a laminated structure containing a printed layer 76 inside, ink is contained inside the blank. This widens the range of ink selection, allows the use of dry, inexpensive inks, and eliminates the need for aging. Naturally, blocking does not occur even if blanks are stacked thickly. In addition, since the printed plastic film 56 is thermally bonded to one surface of the plastic material 36, there is no intermediate layer that would be formed when an adhesive is used between these two layers. That is, when thermal adhesion is used, the original fabric 36 and the film 56 are directly bonded, and the same plastic material is usually used for them, and the printing ink is compatible with the material. The residual heat of the original fabric 36 can be used, and by simply pressurizing the two, or by applying pressure while adding a little heat, adhesion becomes easy and it becomes easier to obtain a laminate having a uniform and suitable thickness. Therefore, it is possible to eliminate the process of applying an adhesive, which is always sticky, is cumbersome to use, and is difficult to uniformly apply.

Moreover, the printed plastic film 56
When using , the film itself is thin and can maintain a mirror-like state, so it has better adhesion to the plate surface on which the ink is applied, and printing can be applied there in good condition, improving the clarity and brightness of the print. improves. Further, since the thin printed plastic film 56 can be wound into a roll, it can be pulled out from the roll and thermally bonded continuously to one side of the plastic material 36. Therefore, mass production of blanks becomes possible.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

First, a method for manufacturing a blank for assembling a video/magnetic tape cassette storage box to which the present invention is applied will be described. 3 and 4 are schematic illustrations of the entire manufacturing process of the blank. In the figure, 20 is a plastic reservoir hopper for storing a transparent (or semi-transparent) material such as polypropylene resin (PP) 22 for plastic raw material. In addition, suitable transparent (or translucent) materials for the plastic material include polyester, polycarbonate, polyvinyl chloride, and the like. 24 is plastic reservoir hopper 2
This is a delivery path located at the bottom of the 0, from which molten plastic is spread thinly and continuously extruded from the delivery port. Reference numeral 26 is a supply pipe for supplying material from the outside when the amount of molten plastic in the hopper 20 is reduced. 28 is an embossing roll, and 30 is a mirror-finished nip roll. The two form a pair, and first, the embossing roll 28 receives the plastic that is continuously extruded onto its periphery, and the mirror-finished nip roll 30 is pressed and held there to form a plastic flat plate 32. In this way, the embossing roll 28 that comes into contact with one surface of the flat plate 32 has a mirror surface section at a predetermined position corresponding to a predetermined portion including a transparent window to be formed on the inner surface of the blank and a lattice shape to be formed on the inner surface. It has lattice-like protrusions at positions corresponding to the grooves, and satin-like unevenness formed between the lattice-like protrusions. These parts are repeated in the axial direction of the roll 28, preferably two or more times, and are repeated one or two times at the same time.
This makes it possible to blank more than one blank. flat plate 3
The mirror-finished nip roll 30 that comes into contact with the other surface of the embossing roll 28 has a mirror-finished surface on the entire circumferential surface of the roll, and by applying a pressing force onto the circumferential surface of the embossing roll 28 through the transparent plastic flat plate 32, the flat plate 32 is Send out sequentially. Then, the surface that comes into contact with the mirror-finished nip roll 30 leaves with a mirror-finished finish. 34 is a drying oven. Therefore, one side (front side) is all mirror surface,
The transparent plastic flat plate 32 having the mirror surface portion and the lattice embossed portion formed on the other surface (back surface) is dried, and the first step of manufacturing the plastic original fabric 36 is completed. The thickness of this plastic material is 400~
It is 1000μm. Note that if the thickness is reduced to less than 400 μm, the shape of the storage box cannot be maintained after assembly. Furthermore, if the thickness exceeds 1000 μm, the storage box becomes too expensive. A number of small rolls 38 and 40 located before and after the drying oven 34 are support rolls that support the plastic flat plate 32 and the raw material 36 and send them forward one after another. FIG. 5 is a diagram of the original plastic fabric manufactured by such a first step, in which figure A is a front plan view and figure B is a back plan view. In the figure, 42, 42a to 42C are mirror surface portions, and 44, 44a to 44c are lattice embossed portions. If a mirror roll corresponding to the embossing roll 28 is installed in place of the embossing roll 28, the back surface will also become mirror-finished, as shown in Figure 6B.
Both surfaces, along with the front side shown in Figure A, are mirror surfaces.

The raw plastic fabric 36 is further sent to the next step. 54 is a printed unstretched plastic film, such as the raw material 36, which has been printed with, for example, grid patterns, colored stripes, trademarks, symbols, etc., as well as indications and designs by vapor deposition, except for the transparent windows that serve as see-through points. This is a film roll wound with a polypropylene film 56 made of the same material. Note that such printed plastic film is thin, for example, about 40 μm, so
Can be rolled. Printing inks are also compatible with the materials used. FIG. 7 is a diagram showing the film supply state. In the figure, 58
are alignment marks with the original film 36 lined up on one edge of the film 56. Each of these marks 58 is provided for each row of horizontally aligned blanking print lines. 60 are cutouts arranged vertically and horizontally on the film 56.
This is a positioning mark for pressing. Each of these marks 60 is provided for each blanking print matrix. Furthermore, when such printed plastic film is used, the film itself is thin and maintains a mirror-like state, so it has good adhesion to the plate surface on which the ink is applied, and printing can be applied there in good condition. , the clarity and brightness of printing are improved.
62 is a thermal adhesive roll, and 64 is a thermal adhesive nip roll. They form a pair, and first, a thermal adhesive roll 62 receives the original fabric 36 on its peripheral surface immediately after production, and then a thermal adhesive nip roll 64 receives the raw fabric 36 from the roll 54 onto one side of the original fabric 36. The drawn out printed unstretched plastic film 56 is thermocompressed and clamped by utilizing the residual heat of the original film 36 without using an adhesive. At this time, a little heat can be applied from the rolls 62, 64, etc. At this time, the printed side of the film 56 is directed toward one side of the original fabric 36, and the two are directly bonded. At that time, if an ink that is not compatible with the original fabric 36 is used, it is preferable to apply an anchor coat that is compatible with the original fabric 36 on the printing surface and then thermally bond the two. become. In this way, a laminate 66 of the original plastic 36 and the printed unstretched plastic film 56 is formed having a uniform and suitable thickness. Note that a means such as a high frequency heating furnace may be used for heating for thermal bonding. Some small rolls 68 behind the thermal adhesive roll 62 are made of plastic laminate 66.
This is a support roll that supports and sequentially transports the material. 69
is a cooling furnace and is fed continuously. It cools the laminated plate 66 and removes its residual heat. Then, the shape, structure, etc. of the laminate plate 66 are stabilized, so the second step of manufacturing the laminate plate 66 is completed. FIG. 8 is a plan view of the plastic laminate manufactured in the second step, and FIG. 9 is a partial side view thereof. The plastic laminate 66 is further fed into a punching and creasing device 70. In addition, 71 is a support roll similar to the small roll 68 mentioned above. Therefore, a blank 74 is obtained by punching out the plastic laminate plate 66 with a suitable punching die, and then hot pressing grooves for bending along dotted lines 72 (see FIG. 10). Note that the arrow X indicates the direction of movement of the upper mold. These blanks 74 are sent first from the punching and creasing device 70 and taken out to the outside, and the third step, which is the final step of blank manufacturing by punching and creasing, is completed. FIG. 10 is a plan view of the blank manufactured in the third step. Further, FIG. 1 is a partially enlarged side view thereof. In Figure 1, 7
6 is a printing layer on the printing surface of the unstretched plastic film 56, and 80 is the lattice embossed surface of the original film 36. When the blank 74 is produced using a laminated structure in which the printed unstretched plastic film 56 is thermally bonded to one surface of the original plastic film 36 and the printed layer 76 is contained inside, the ink is absorbed into the inside of the blank. This makes it possible to select a wider range of inks. In particular, the use of dry, inexpensive inks eliminates the need for aging. Further, even if the blanks 74 are piled up thickly, blocking can be completely prevented.
In addition, since the plastic film 56 is not stretched, the portions of the plastic film 56 are smoothly stretched and recessed in response to the pressure when the lines are pressed, so that the plastic film does not break. Therefore, plastic film 5
The characters, patterns, etc. printed on 6 are no longer cut off, and the finished state is improved.

The blank 74 is further fed to the remains 82 of the plastic laminate 66 from which it has been extracted, by a support roll 84, and then wound up one after another by a remains roll 86. This winding process using the debris roll 86 is the fourth process. FIG. 11 is a perspective view of a portion of such plastic laminate debris. FIG. 12 is a plan view showing the change in a plastic laminate after a series of steps have been carried out, from manufacturing the plastic laminate in the second step to winding up the residue in the fourth step. In addition, if the manufacturing process of the blank 74 is reduced and continued in this way,
The blank 74 can be mass-produced with high yield.

FIG. 13 is a perspective view of a storage box, which is completed by bending the blank shown in FIG. 10 manufactured through the above-mentioned steps, assembling it, and gluing it at predetermined locations. In the figure, 88 is a storage box for video/magnetic tape cassettes. Reference numeral 90 denotes a transparent window through which the inside of the box can be seen, reference numeral 92 indicates printing of characters, trademarks, etc., and reference numeral 94 indicates display of characters by vapor deposition. On the outer surface of such a storage box 88, except for the transparent window 90, printing 92, character display 94 by vapor deposition, etc. can be clearly seen through the transparent plastic film 56. As a result, the outer surface of the storage box 88 is made opaque by printing 92, vapor deposition 94, etc.
Designs such as patterns, characters indicating stored items, trademarks, symbols, etc. can be displayed while maintaining a smooth state. In addition, if the inner surface is treated with an opaque treatment such as grid embossment or the like, a suitable amount of frictional force will be applied to the housed cassettes, which will help prevent them from flying out.

In this embodiment, an unstretched printed plastic film was used, but a stretched plastic film obtained by further stretching the unstretched plastic film may also be used.

Effects of the Invention According to the invention described above, since a blank having a laminated structure containing a printed layer inside is used, it is possible to select a wide range of inks.
Naturally, there is no need to consider blocking. Furthermore, when using pre-printed plastic film, the plastic film is thin and maintains a mirror-like state, so printing can be applied to it in good condition, improving the clarity and brightness of the print and improving the finished product's quality. can be made excellent. In addition, the printed plastic film, which is made of the same material as the original film, is thin and can be rolled up, so when it is thermally bonded to the plastic film, it can be bonded without using an adhesive.
Laminated structures can be easily and continuously formed using residual heat from the original fabric. Therefore, blanks can be mass-produced and product costs can be further reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged side view of the blank shown in FIG. 10 used in a storage box for magnetic recording media according to an embodiment of the present invention. FIG. 2 is a partially enlarged side view of a blank used in a conventional storage box for magnetic recording media. 3 and 4 are schematic illustrations of the entire manufacturing process of a blank used for a storage box for magnetic recording media according to an embodiment of the present invention. Figure 5 is a diagram of the original plastic fabric formed in the same manufacturing process, and its A
The figure is a front side plan view, and the figure B is a back side plan view. 6th
The figures are other plastic original fabric drawings formed in the same manufacturing process as above, of which figure A is a front side plan view and figure B is a back side plan view. FIG. 7 is a diagram showing the state of supply of printed unstretched plastic film used in the above manufacturing process. FIG. 8 shows a plastic laminate before removing the blank formed in the same manufacturing process. FIG. 9 is a partial side view of the same plastic laminate. FIG. 10 is a plan view of a blank formed in the same manufacturing process. FIG. 11 is a perspective view showing a portion of the remains after the blank is removed from the same plastic laminate. FIG. 12 is a plan view showing the changes in the plastic laminate formed in the same manufacturing process from manufacture to debris. FIG. 13 is a perspective view of a storage box for video/magnetic tape cassettes showing an embodiment of the present invention. 36...Plastic original fabric, 56...Printed unstretched plastic film, 76...Printing layer,
80...Lattice embossed surface.

Claims (1)

[Scope of claims for utility model registration] (1) A printed plastic film made of the same material as the original film is thermally bonded to one side of the original plastic film,
A storage box for magnetic recording media characterized by using a blank having a laminated structure containing a printed layer inside. (2) The storage box for magnetic recording media according to claim 1, wherein the printing uses ink that is compatible with the original fabric. (3) The storage box for magnetic recording media according to claim 1, wherein an anchor coat that is compatible with the original film is applied on the printed surface of the plastic film.