JPH06100017A - Bending sheet material - Google Patents

Abstract

PURPOSE:To provide a sheet material with bending ruled lines by which the height of blade for ruled lines can be easily adjusted and the bending easiness of a plurality of ruled lines is made almost similar. CONSTITUTION:Shallower parts 13 and deeper parts 12 are formed in the longitudinal direction of bending ruled lines 11. The deepest part 12 is made in such a way that the sheet 10 is almost punched out and the depth of shallower parts 13 and/or the ratio of length against the deeper parts 12 are changed in accordance with the length of ruled lines 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folded sheet material, and more particularly to a structure of a ruled line when a box or the like is manufactured by performing a bending process according to a plurality of folded ruled lines provided on a plastic sheet.

[0002]

2. Description of the Related Art Conventionally, when a box 1 as shown in a perspective view of FIG. 7 is manufactured by bending a plastic sheet, it is punched into a predetermined shape as shown in a developed view of FIG. Further, a plurality of folding ruled lines 3a, 3b, 3c, ... Are provided at predetermined positions of the plastic sheet material 2, and the folded ruled line portions are bent to be assembled.

When the folding ruled lines 3a, 3b and 3c are formed on the plastic sheet material 2 as described above, the ruled lines 3 are formed.
The bendability is adjusted by the remaining thickness of the sheet in the portions a, 3b, and 3c, but since the bendability changes significantly even if the remaining thickness slightly changes, accurate processing is required. Even if the remaining thickness is the same, long ruled lines 3a
If the lengths of the ruled lines are different, the bendability changes, and if the ruled lines have the same depth, the bendability of the long ruled lines 3a portion deteriorates and the stiffness of the short ruled line 3b portions becomes weak. Therefore, it is necessary to process the ruled line with an optimum depth according to the ruled line length.

[0004]

However, the plastic sheet material 2 that is usually used has a thickness of 0.1 to 10.
Since it is a thin sheet of 1.0 mm, it is difficult to measure the depth of each ruled line. In addition, when the box 1 as described above is made, a schematic cross-sectional view is shown in FIG. As shown in the drawing, the Thomson die 7 in which the punching blade 5 and the ruled line blade 6 are incorporated in the same die is generally used. However, in such a die having a plurality of ruled line blades corresponding to each ruled line When simultaneously forming, when adjusting the height of the corresponding crease blade to adjust the depth of one crease line, the pressing force of this part changes significantly, so the pressing force of other crease blades is affected. As a result, the depth of each ruled line also changes, making it difficult to make accurate adjustments.

Therefore, the present invention provides a ruled line structure capable of adjusting the bendability and strength of a plurality of folding ruled lines provided on a folded sheet material to be processed into a box or the like within an appropriate range according to the length thereof. Is intended.

[0006]

In order to achieve the above-mentioned object, the folded sheet material of the present invention is a folded sheet material in which a plurality of folding ruled lines are provided on a plastic sheet and processed into a box or the like. A shallow portion and a deep portion are formed in the longitudinal direction, and the deepest portion of each ruled line is substantially punched out from the sheet, and the shallow portion has its depth and / or depth depending on the length of the ruled line. It is characterized by changing the length ratio to the deep part.

[0007]

[Operation] According to the above configuration, the depth of the shallow portion, that is, the remaining thickness of this portion is changed according to the length of the folded ruled line, the remaining thickness is reduced for long ruled lines, and the remaining thickness is increased for short ruled lines. By this, or by making the length ratio of the shallow portion to the deep portion small for long ruled lines and large for short ruled lines, the same bendability can be obtained regardless of the length of the ruled lines. Further, even when a plurality of ruled lines are simultaneously processed by using the Thomson die by making the sheet the substantially deepest part of the sheet, the part that forms the deepest part of each ruled line blade, that is, the blade It suffices to adjust the leading end of the sheet into contact with the flat pedestal on which the sheet is placed, and it is not necessary to perform fine vertical adjustment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below based on the embodiments shown in the drawings. FIG. 1 is a sectional view showing an example of a folding ruled line provided on a folded sheet material and a ruled line blade processing device for forming the ruled line, and FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a schematic cross-sectional view of a die for simultaneously punching a sheet material and processing a ruled line, FIG. 4 is a front view of an essential part for explaining the dimension of a ruled line blade, and FIGS. 5 and 6 are respectively for assembling a folded sheet material. It is sectional drawing which shows an example at the time.

First, as shown in FIGS. 1 and 2, each folding ruled line 1 provided on the folded sheet material 10 of the present invention.
1 is a deep portion 12 and a shallow portion 13 in the longitudinal direction of each ruled line.
The ruled line 11 is formed by placing the sheet material 10 on a flat pedestal 14 and comprising concave and convex blades corresponding to the deep portion 12 and the shallow portion 13 of the ruled line 11, respectively. It is formed by pressing with 15.

The deep portion 12 of the ruled line 11 is formed in a state in which the sheet material 10 is substantially punched out, that is, in a state in which the sheet material 10 is completely punched out or an extremely thin residual thickness is left. As shown in FIG.
The blade edge 15a of the ruled line blade 15 that forms the is set to the same height as the blade edge 16a of the punching blade 16.

The depth of the shallow portion 13, that is, the remaining thickness of this portion is determined according to the length of the folding ruled line 11. For example, in the box body 1 shown in FIG. 7, as shown in FIG. 8, three types of ruled lines, that is, a long ruled line 3a, a short ruled line 3b, and an intermediate length ruled line 3c are provided. The depth of 13 is increased to reduce the remaining thickness of this portion, and in the case of the short ruled line 3b, the shallow portion 1
The depth of 3 is made shallow to increase the remaining thickness of this portion.

For example, in the case of a general transparent polypropylene sheet having a thickness of 0.3 mm and the ruled line lengths of 100 mm and 50 mm, the ruled line blade 15 shown in FIG.
When the length A of the portion 15b forming the shallow ruled line and the length B of the portion 15c forming the deep ruled line are each 0.7 mm and the blade edge angle Q is 60 degrees, the portion 15b forming the shallow ruled line is deep. The step C with the part 15c forming the ruled line is 0.17 m when the ruled line has a length of 100 mm.
When the ruled line has a length of m and a length of 50 mm, the ruled line has the same bendability by setting the distance to 0.2 mm.

As described above, the depth of the shallow portion of the stepped ruled line, that is, the remaining thickness is changed according to the length of the ruled line, so that the same bendability can be obtained regardless of the length of the ruled line. In addition, it is possible to easily perform processing and assembly using an automatic box making machine and to obtain a box body excellent in appearance.

In the present embodiment, the length A of the shallow portion and the length B of the deep portion are both 0/7 mm, but the ratio of the length A to the length B is 80% to 20%. By changing the length according to the length of each ruled line, the same bendability can be obtained regardless of the length of the ruled line. Furthermore, it goes without saying that both means may be used in combination.

Further, when the folding sheet material provided with the folding ruled lines is subjected to the bending process to manufacture the box body, since the solvent type adhesive has a sanitary problem, a hot melt type adhesive may be used. However, there is a problem that the folded sheet material is deformed by the heat applied first when the molten hot melt adhesive is applied.

In order to avoid the deformation of the sheet material,
As shown in FIGS. 5 and 6, the hot melt type adhesive H in a molten state is applied to the adhesive margin surfaces 1a and 1b that come inside after assembly, and then the adhesive margin surfaces 1c and 1d that come to the outer surface are superposed. Is desirable. When the portions to which the hot-melt adhesive H is applied are set to the inner glue margin surfaces 1a and 1b as described above, warp or waviness occurs on the inner glue margin surfaces 1a and 1b due to the first heat of the melted adhesive. However, since the outer adhesive margin surfaces 1c and 1d, which are conspicuous, come into contact with the adhesive surface that has been heated, thermal deformation hardly occurs, and the outer surface after bonding can be kept in a beautiful state.

For example, generally, the temperature at the time of applying a hot melt adhesive for adhering polyvinyl chloride, polyethylene terephthalate or polypropylene sheet is 80.
℃ to 150 ℃, which is much higher than the softening temperature of the sheet, but by applying the hot melt adhesive according to the above procedure and adhering it to assemble the box etc., good adhesiveness and a beautiful appearance can be obtained. Is obtained.

Needless to say, the present invention can be applied not only to the polypropylene sheet but also to polyethylene terephthalate, polycarbonate, polyvinyl chloride, polystyrene and composite sheets thereof.

[0019]

As described above, in the folding sheet material of the present invention, when a plurality of folding ruled lines are provided on the plastic sheet, a shallow portion and a deep portion are formed in each folding ruled line, and the deepest portion is formed. Since the sheet was roughly punched out, the depth of the shallow portion and / or the length ratio to the deep portion was changed according to the length of the ruled line.
Similar bendability is obtained regardless of the length of the ruled line,
It is possible to perform processing and assembly using an automatic box making machine, and it is possible to obtain a box body excellent in appearance.

Furthermore, the deepest part of the folding ruled line is
When punching the sheet material and processing the ruled lines at the same time by making the sheet almost punched out, it is sufficient to adjust the cutting edge of each ruled line blade to the same height as the cutting edge of the cutting blade, and fine vertical adjustment It is not necessary to carry out the process, and various folding sheet materials can be manufactured very easily by preparing a ruled line blade having a tip pattern adapted to the ruled line length in advance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a folding ruled line provided on a folded sheet material of the present invention and a ruled line blade processing apparatus for forming the ruled line.

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

FIG. 3 is a schematic cross-sectional view of a die that simultaneously punches a sheet material and processes ruled lines.

FIG. 4 is a front view of a main part for explaining the size of a ruled line blade.

FIG. 5 is a cross-sectional view showing an example of assembling a folded sheet material.

FIG. 6 is a sectional view showing another example of assembly.

FIG. 7 is a perspective view of a box body showing an example in which a folded sheet material is folded and assembled.

FIG. 8 is a development view showing an example of a folded sheet material forming a box body.

FIG. 9 is a schematic cross-sectional view of a conventional die that simultaneously punches a sheet material and processes ruled lines.

[Explanation of symbols]

10 ... Bending sheet material 11 ... Folding ruled line 1
2 ... deep part 13 ... shallow part 14 ... cradle
15 ... Ruled line blade 15a ... Blade edge 15b ... Part forming shallow ruled line 15c ... Part forming deep ruled line
16 ... Punching blade

Claims (1)

[Claims] 1. A folded sheet material for processing a plastic sheet into a box by providing a plurality of folded ruled lines,
A shallow portion and a deep portion are formed in the longitudinal direction of each of the folded ruled lines, and the deepest portion of each of the ruled lines is substantially punched out from the sheet, and the shallow portion is formed according to the length of the ruled line. A folded sheet material, characterized in that the depth and / or the length ratio to the deep portion is changed.