JPH046037A - Cylinder for foldable box - Google Patents

Abstract

PURPOSE:To facilitate opening wide though in a flatly pressed state due to a difference of width by making a sheet width between folding lined different on both sides of the folding line as a border line. CONSTITUTION:A sheet 1 provided with prescribed folding lines 11 to 14 is shaped in a cylinder with an overlap width 2 at one end pasted with the other end 3, and the cylinder is pressed flat. Though the cylinder is pressed flat, a sheet width (11-12-13) between lines 11, 12 and 13 on one surface from the line 11 to the line 13 is larger than another sheet width (11-14-13) between lines 11, 14 and 13 on the other surface from the line 11 to the line 13. This makes it easy to open wide the pressed cylinder in a triangle. In this instance, it is preferable that the sheet width (11-12-13) on one surface should be larger than the sheet width (11-14-12) on the other surface by 0.1%-0.3%. If less than 0.1%, the facility to open is decreased, and if larger than 3%, the shaped of a foldable box, when assembled up, receives bad influence.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves punching out a sheet of plastic, paper, etc. into a predetermined shape, providing predetermined bending lines, and pasting the ends together to form a cylinder. This invention relates to a cylindrical body for a folding box made by flattening a cylindrical body.

(Prior Art and Problems to be Solved by the Invention) Conventional cylinders for folding boxes are flattened so as not to be bulky during transportation or storage. This cylindrical body for a folding box may warp or wave due to external forces during transportation or storage, but there is a problem in that it is difficult to unfold such a cylindrical body and it is difficult to assemble a folding box.

(Means for Solving the Problems) The present invention aims to solve the above problems, and its gist is to form a cylinder by pasting together the ends of a sheet provided with predetermined folding rules, and then flattening this into a cylinder. This cylindrical body for a folding box is characterized in that the sheets on both sides have different widths from each other at the fold line.

This will be explained below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a cylindrical body for a folding box according to the present invention, FIG. 2 is a sectional view taken along line ff-II in FIG. 1, and FIGS. 3 and 4 are sectional views showing the folding process.

In the present invention, a sheet 1 provided with predetermined folding lines 11 to 14 is made into a cylinder by pasting the glue margin 2 at one end with the other end 3, as shown in FIGS. 1 and 2, and then flattening the sheet 1. .

Although it is flat, as shown in FIG. 2, the sheet @ (ii-i2 to 13
) is larger than the sheet width (11-14-13) between the ruled lines 11, 14, and 13 on the other side, and therefore tends to spread into a triangular shape as shown.

It is preferable that the width of the sheet on one side <11-I 2-I3) is 0.11% to 3% larger than the width of the sheet on the other side (11-14-13>. If it is less than 0.11%, the ease of spreading is small; If it is larger than %, the shape of the assembled folding box will be adversely affected.

Here, a preferred example for manufacturing the cylindrical body for folding boxes of the present invention will be explained.

First, as shown in FIG. 3, the glue 2 is pasted with the other @ 3 in a pressed state using the ruled lines 12 and 14 as folds.

Here, the width of the sheet on both sides of the fold<12-13-1.
4) and <12-11-14> are the same width, and the percentage of the sheet on the long side (12-13) is the same as the width of <11-1 on the other side.
4> larger by X, and the short side sheet width < 1.2-
The positions of ruled lines 11 and 13 are set so that (11) is larger by X than (13-14) on the other side. Therefore, the interval between ruled lines < 1.1-12-13) is <
11 to 14-13) by x"-, x=2x.

Next, expand it into a quadrilateral shape as shown in Figure 4, and this time apply ruled line 1.
1 and the ruled line 13 as folds and crushing them, a cylindrical body for folding boxes as shown in Figs. 1 and 2 can be obtained. Accordingly, according to this method, in the state shown in Fig. 3, both sides have the same width, so there is no risk of expansion. It is easy to perform the bonding work, and by simply expanding the sheet and folding it back from another ruled line, a cylindrical body for folding boxes can be obtained in which the sheet widths on both sides differ by 2x at the fold line.

(Effects of the Invention) In the present invention, since the widths of the sheets on both sides differ from each other at the fold line as described above, even when crushed flat, they are easy to spread due to the difference in width, which makes storage and transportation easier. Even if it is warped or wavy, it is extremely easy to adapt to the condition of a folded box.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a cylindrical body for a folding box according to the present invention, FIG. 2 is a sectional view taken along the line -■ in FIG. 1, and FIGS. 3 and 4 are sectional views showing the folding process. 1 piece

Claims (1)

[Claims] In a cylindrical body for a folding box, which is formed by pasting together the ends of sheets with predetermined folding lines to form a cylinder and crushing this into a flat shape, the widths of the sheets on both sides differ from each other at the fold line. Characteristic cylindrical body for folding boxes.