JPH04128038A - Transparent sheet material for paper box - Google Patents

Abstract

PURPOSE:To remove the breakage or the crack in the corner part of a paper member, while the recessed part, the hole and the gap, etc., on the transparent corner part of a paper box are omitted by a method in which, while a thin transparent film is stuck onto the surface of a thick transparent sheet, the part kept as at least the inside of the folding ruled line of a paper box of thick transparent sheet, is cut off. CONSTITUTION:The transparent sheet member 10 for a paper box is composed of the thick transparent sheet 11 made of plastic and the thin transparent film 12 which is to be stuck onto one surface of the sheet 11 and is made of plastic. A folding ruled line 13 and the part 14 to be cut off are formed at prescribed position of the sheet 11. When the transparent sheet member 10 for the paper box is stuck into a paper box 15, the inner surface of the paper member 15a on the outer periphery of a window 16 is coated with an adhesive, and the side of the film 12 of the transparent sheet member 10 for the paper box, is pressed thereto. By forming thus the sheet member 10, since the whole part corresponding to the corner part of the paper box 15 is formed of only thin film 12, the sheet excellent in folding property is obtained. At the part except the part 14 to be cut, the sufficient strength in adhesion may be also obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transparent sheet material used for a paper box having a transparent portion.

[Conventional technology]

2. Description of the Related Art Recently, paper boxes have been widely used in which a window is provided in a part of the paper box and a transparent plastic material is attached to the window in order to show the contents stored inside the paper box.

FIG. 6 is a perspective view showing an example of a paper box with a transparent window, and FIG. 7 is a sectional view showing a state in which a transparent sheet is attached to the paper material of the paper box.
FIG. 8 is a sectional view showing a folded state of the transparent sheet and paper material shown in FIG. 7, and FIG. 9 is a perspective view showing another example of the shape of the transparent sheet.

As shown in Figure 6, in a paper box with a transparent window, paper box 1
If a thin transparent film material is used, the corners will be deformed and wrinkles will occur frequently, so if the window 2 is provided at the corner of the 0.
15 to 0.3111 transparent plastic sheet material 3
is used. That is, as shown in FIG. 7, the sheet material 3 is pasted inside the window periphery of the paper material 4 of the paper box.
And the ruled lines 3a and 4a for folding are formed on the paper material 4, and the ruled line 3a is formed.

By folding the paper material 4 along the edges 4a, a window extending over two sides of the paper box is formed, but as shown in FIG. 8, tears or cracks 4b may occur at the corners of the paper material 4.

Therefore, as shown in FIG. 9, there is a sheet material 3 in which a cutout portion 3b is formed in a portion corresponding to the inside of the paper material 4 to prevent the paper material 4 from tearing after being folded.

C Problems to be Solved by the Invention] However, in the case where the cutout portion 3b is formed as described above, it is difficult to accurately align the sheet material 3 and the paper material 4, and holes may be formed. Gaps sometimes occurred. In addition, since the expansion and contraction rates due to temperature and humidity are different between the sheet material 3 and the paper material 4, even if the alignment is performed accurately, recesses 5 (Fig. 6) and gaps will occur, causing dirt and dust to enter the box. There were times when I entered.

Therefore, an object of the present invention is to provide a transparent sheet material for a paper box that eliminates recesses, holes, gaps, etc. at the corners of the transparent part of the paper box, and can also prevent tearing and cracking of the corners of the paper material.

[Means to solve the problem]

In order to achieve the above object, the transparent sheet material for paper boxes of the present invention is a transparent sheet material for paper boxes used for a transparent part formed in a part of a paper box, in which the sheet material has a surface of a thick transparent sheet. A thin transparent film is attached to the box, and at least a portion of the thick transparent sheet that is inside the folding line of the paper box is cut out.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings.

Fig. 1 is an exploded perspective view of a transparent sheet material for paper boxes, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a perspective view showing the state in which it is attached to a paper box, and Fig. 4 is a main part showing the folded part of the paper box. A sectional view, and FIG. 5 is a sectional view showing another example of folding ruled lines of a transparent sheet material for a paper box.

The transparent sheet material 10 for paper boxes includes a thick transparent sheet made of plastic (hereinafter simply referred to as a sheet) 11, and the sheet 1.
A thin transparent film made of plastic (hereinafter simply referred to as a film) 12 is attached to one side of the sheet 11, and bending lines 13 and cutouts 14 are formed at predetermined positions on the sheet 11. .

The sheet 11 includes a window 1 formed in a paper box 15.
Although an appropriate material can be used depending on the shape and size of the material, normally a hard and stiff sheet with a thickness of about 0.15 to 0.5 mm is preferably used, and the material is: PVC.

Polypropylene, polyethylene terephthalate.

Polyethylene etc. can be used.

Further, as the film 12, polyvinyl chloride, polypropylene, polyethylene terephthalate, polyethylene, etc. can be used, and the thickness thereof is 0.05~
Approximately 0.15 liter is preferable.

If the thickness of the film 12 exceeds 0.15 μl, there is a high possibility that tears or cracks will occur on the surface of the 15 g of paper material at the corners of the paper box 15.

The folding ruled lines 13 can be formed by completely cutting the sheet 11 and connecting them with a film 12 as shown in the figure, or by forming an elongated hole or a thin wall part 13a in the sheet 11 as shown in FIG. This imparts bendability to the sheet 11, and can be formed by an appropriate method depending on the bending angle and length of the bending portion, the material and thickness of the sheet 11, etc.

The cutout portion 14 is a paper material 15a that forms the paper box 15.
It is formed on the inside of the corner of the paper box, that is, on the inside of the folding ruled line of the paper box.The shape can be formed in various shapes depending on the size of the paper box 15, the material of the paper material 15a, etc., for example, a rectangular shape. shape.

U-shape, V-shape, etc. can be adopted.

The sheet 11 and the film 12 can be bonded together in the same manner as the bonding of a normal plastic sheet and film, and for example, adhesives, fusion, etc. can be used. In addition, when pasting the paper box transparent sheet material 10 to the paper box 15, the window portion 16
Adhesive may be applied to the inner surface of the paper material 15a at the outer periphery and the film 12 side of the transparent sheet material 10 for a paper box may be pressed.

By forming the transparent sheet material 10 for a paper box in this way, when the sheet material 10 is pasted to the window 16 of the paper box 15 and folded, the portion corresponding to the window 16 is formed into a thick sheet 11. The composite film 12 provides sufficient strength to eliminate wrinkles and deformation, and the bending lines 13 form accurate and beautiful corners to prevent the occurrence of recesses, holes, gaps, etc. can. Especially as shown above, cut sheet] 1 completely and fold it along ruled line 1.
3, the parts corresponding to the corners of the paper box 15 are entirely made of the thin film 12, so that a product with excellent bendability can be obtained. In addition, since the cutout part 14 is formed by cutting out the part of the paper box that is inside the folding ruled line, there is no tearing or cracking on the corner surface of the paper box 15, and when pasting the part other than the cutout part 14, Sufficient strength can also be obtained.

In the above embodiments, the paper box has windows on two sides, but it is also possible to use paper boxes with windows on three or more sides, lids, or the entire front side. It can also be formed in the same way.

〔Effect of the invention〕

As explained above, the transparent sheet material for paper boxes of the present invention is obtained by pasting a thin transparent film on the surface of a thick transparent sheet, and cutting out at least a portion of the thick transparent sheet that will be inside the folding lines of the paper box. Therefore, since the parts that require strength are made of a composite of thick sheets and thin films, wrinkles and deformation can be prevented. Also,
Since only a thin film is adhered to the folded part of the paper box by cutting out the thick sheet, it is possible to prevent tears and cracks from occurring on the surface of the folded part of the paper box. Since the film is attached, there are no holes, gaps, etc. formed.

Therefore, by using the transparent sheet material for paper boxes of the present invention, it is possible to obtain a paper box with a transparent window that has good sealing performance and is beautiful and strong.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is an exploded perspective view of a transparent sheet material for a paper box, Figure 2 is a sectional view of the same, and Figure 3 is a transparent sheet material attached to a paper box. A perspective view showing the state;
Fig. 4 is a cross-sectional view of the main part showing the folding part of a paper box, Fig. 5 is a cross-sectional view showing another example of folding ruled lines of a transparent sheet material for a paper box, and Figs. 6 to 9 show conventional examples. Fig. 6 is a perspective view showing an example of a paper box with a transparent window, Fig. 7 is a sectional view showing a transparent sheet attached to the paper material of the paper box, and Fig. 8 is a perspective view showing an example of a paper box with a transparent window. FIG. 9 is a cross-sectional view showing a state in which the paper material is folded, and FIG. 9 is a perspective view showing another example of the shape of the transparent sheet. 10...Transparent sheet material for paper boxes 11...Thick transparent sheet 12...Thin transparent film 13...
・Folding ruled line 14... Cutting section 15... Paper box 16... Window section

Claims (1)

[Claims] 1. In a paper box transparent sheet material used for a transparent part formed in a part of a paper box, the sheet material is made by pasting a thin transparent film on the surface of a thick transparent sheet, and
A transparent sheet material for a paper box, characterized in that at least a portion of the thick transparent sheet that is inside the folding ruled line of the paper box is cut out.