JPH07205969A - Blank sheet - Google Patents

Abstract

PURPOSE:To obtain a beautiful and high graded plastic case without wrinkles or the like made on a transparent window by forming a blank sheet with a paper sheet with a window hole provided and a plastic sheet laminated via a hot melt adhesive layer. CONSTITUTION:Hot melt adhesive agent 3 is applied to a rear face of a printed paper sheet 1, and once it is cooled to be hard, a window 11 is punched out. Then it is heat-pressed to a transparent plastic sheet 2 via the hot melt adhesive layer 3 to be adhered and laminated. Then this laminated body is punched into an expanded shape of a plastic case to form a blank sheet with fold lines 4 provided. Then the sheet is folded with the paper 1 layer facing outward via the fold lines 4 after a margin for pasting is adhered to another end 51 to form a cylinder for assembling the plastic case. Thus a soft feeling of the paper 1 is exhibited outside while a transparent window 11 has a step as thick as the paper 1, so that a scratch or the like may not be likely to occur to the plastic film during transportation.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a blank sheet for assembling a plastic case having a see-through window.

[0002]

2. Description of the Related Art As a plastic case having a transparent window that has been generally used in the past, a paper box is provided with a window hole, and a transparent plastic film or sheet is adhered from the inside around the window hole. There are a transparent plastic film attached to the entire outer surface of the paper box, a transparent plastic sheet with a window portion left for printing, and a plastic case having a see-through window.

In a paper box in which a transparent plastic film or sheet is adhered from the inside around the window hole, the thickness of the paper is increased to maintain the strength of the box, so that the cross section of the paper around the window hole is visible from the outside and is beautiful. It does not look like a box and does not give a high-class feel.

A box in which a transparent plastic film is adhered to the entire outer surface of the paper box has a glossy appearance of the plastic, which makes the outer surface feel cold, and a difference in shrinkage between the plastic film and the paper due to humidity or the like is large. Wrinkles may occur frequently on the part of the plastic film.

In the case where the entire box is composed of printed plastic sheets, the cost of printing on the plastic sheets tends to be high, and the yield tends to be significantly inferior to that of paper, and the gloss of the plastic tends to appear on the outer surface and feel cold. There is a problem that it can not be adopted for products that want to give a soft feeling.

[0006]

SUMMARY OF THE INVENTION The present invention has improved appearance and cold feeling which were problems of the prior art. Paper having a soft feeling, transparency, waist strength, and dimensions against humidity. By combining a plastic sheet with advantages such as stability, a transparent and soft plastic case is obtained, and a paper with a window hole and a plastic sheet are combined with a hot melt adhesive layer. It is a blank sheet formed by stacking through, punching into a case expanded shape, and laying folding ruled lines, which will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing an example of the blank sheet of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIGS. 3 to 6 are for explaining steps for manufacturing the blank sheet of the present invention. FIG. 7 is a partial sectional view, and FIG. 7 is a perspective view of a plastic case in which the blank sheet of FIG. 1 is assembled.

As shown in FIGS. 1-2, the present invention provides a window 11
It is a blank sheet obtained by laminating a paper 1 provided with the above and a plastic sheet 2 with a hot melt adhesive layer 3 interposed therebetween, punching it into a case developed shape and laying a folding ruled line 4.

As the paper 1 used in the present invention, synthetic paper or non-woven fabric may be used in addition to ordinary paper, thin paper is preferable, and the thickness is 1
Plastic sheet 2 for bonding 0-100μ
It can be preferably used since it has a small physical influence on. Further, the paper 1 may be printed, and after printing, various gloss processing may be performed on the printing surface to give gloss.

As the plastic sheet 2, a single or composite sheet made of hard or semi-rigid polyvinyl chloride, polystyrene, polypropylene, polyethylene terephthalate or the like can be adopted, and the wall thickness is 0.1 to 1.0 mm.
Some of them have high rigidity, the strength of the assembled plastic case is increased, and wrinkles do not occur in the window portion, so that they can be preferably used. A transparent plastic sheet is preferred but may be printed.

In order to stack the paper 1 and the plastic sheet 2, the steps shown in FIGS. 3 to 6 can be adopted.

That is, first, as shown in FIG. 3, a hot melt adhesive 3 is applied to the back surface of the paper 1 on which printing 13 is applied,
Once cooled and cured, the paper 1
Is punched out to form the window hole 11, and then the paper 1 is heated and pressed to the transparent plastic sheet 2 via the hot melt adhesive 3 as shown in FIG. This has an advantage that the adhesive layer can be formed in a necessary portion without excess or deficiency, and the step of punching the paper 1 and providing the window hole 11 is easy because the adhesive layer is cured.

Then, as shown in FIG. 6, the laminated body of the paper 1 and the plastic sheet 2 in a bonded state is punched out into a developed shape of a plastic case, and a folding ruled line 4 is laid to manufacture a blank sheet. Here, the bonding step is efficient because the paper 1 and the plastic sheet 2 which are still long can be used.

Here, the window hole 11 is punched in the paper 1, the laminated body is punched in the expanded shape of the plastic case,
In order to lay the folding ruled lines 4 into a blank sheet, as shown in FIG. 4, punch out an outline shape with a Thomson die 6, 61 or the like used in general paper or plastic sheet processing, and at a predetermined depth. Good processing can be performed by a method of pressing to form the bent ruled line 4.

Further, using the blank sheet of the present invention,
When assembling the plastic case as shown in FIG. 7, the glue margin 5 is adhered to the other end 51 to form a tubular shape with the layer of the paper 1 of FIGS.
It is preferable to fold and assemble the paper 1 because the soft feeling of the paper 1 is exposed. Further, since the transparent window 11 has a step corresponding to the thickness of the paper 1 and the surface of the plastic sheet 21 is lowered, scratches and the like during transportation are less likely to occur.

[0016]

EXAMPLE As shown in FIG. 3, the paper 1 is 50 g / m.
Printing 13 is performed on the high-quality processed paper of ² , and an ethylene-vinyl acetate-based hot melt adhesive is applied as an adhesive layer to the surface opposite to the printed surface and cooled, and one day later, as shown in FIG. Punch the window hole 11 in the position with Thomson type 6,
As shown in FIG. 5, an amorphous polyethylene terephthalate sheet having a wall thickness of 0.25 mm is continuously pressed between the heating roll 7 (diameter 200 mm) at 120 ° C. and the receiving roll 71 on the side of the paper 1 to achieve complete adhesion. It was

After that, the laminate was punched with Thomson molds 6 and 61 by a press machine as shown in FIG. 6, and a folding ruled line 4 was laid to obtain a blank sheet of good quality. This blank sheet is formed into a tubular shape by adhering the glue margin 5 to the other end 51 so that the layer of the paper 1 is on the outer surface, and then bent from the folding ruled line 4 to form a plastic case as shown in FIG. When assembled, a soft feeling was obtained as a whole, and the plastic sheet 21 which became the see-through window had a beautiful finish without wrinkles.

[0018]

EFFECT OF THE INVENTION The present invention is a blank sheet obtained by laminating a paper sheet having a window and a plastic sheet via a hot melt adhesive layer, punching it into a case developed shape and laying folding ruled lines. Inexpensive printing method of paper, softness of paper, dimensional stability of plastic sheet, and strength of waist make it possible to obtain beautiful high-grade plastic case without wrinkles even if there is a large see-through window. The thickness of the transparent window will be stepped and the height will be lower, so it will be less likely to be scratched during transportation.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a blank sheet of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partial cross-sectional view illustrating a process for manufacturing a blank sheet of the present invention.

FIG. 4 is a partial cross-sectional view illustrating a process for manufacturing a blank sheet of the present invention.

FIG. 5 is a partial cross-sectional view illustrating a process for manufacturing a blank sheet of the present invention.

FIG. 6 is a partial cross-sectional view illustrating a process for manufacturing a blank sheet of the present invention.

7 is a perspective view of a plastic case in which the blank sheet of FIG. 1 is assembled.

[Explanation of symbols]

 1 Paper 11 Window Hole 2 Plastic Sheet 3 Hot Melt Adhesive Layer 4 Folding Ruled Line

Claims (1)

[Claims] 1. A blank sheet obtained by laminating a paper sheet having a window hole and a plastic sheet via a hot melt adhesive layer, punching the sheet into a case development shape, and laying a folding ruled line.