JPH0669716B2 - How to attach folding lines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a folding ruled line to a plastic sheet.

[0002]

2. Description of the Related Art Bending a plastic sheet,
When processing into a doll case, packaging container, etc., a folding ruled line is attached and bending is performed along this line. As shown in the partial cross-sectional view of FIG. 4, a conventional folding ruled line formed on a conventional plastic sheet containing folding ruled lines includes, for example, a groove 11 that is recessed in the thickness direction of the plastic sheet 2 to facilitate bending. However, the surface along the folding ruled line 1 was finished to be smooth, both microscopically and microscopically.

[0003]

The above-mentioned conventional plastic sheet with folding ruled lines is not sufficiently foldable, and when it is bent, it cannot be finished at a predetermined angle, or the flat surface after processing is curved due to residual stress. There was a problem that it was easy to do.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to improve the foldability of a plastic sheet with folding creases, and the gist thereof is to squeeze the plastic sheet between a crease blade and a cradle to form a groove. In forming the groove, small irregularities are formed on the blade edge of the ruled line blade and / or the surface of the pedestal to form minute irregularities on the inner surface of the groove and / or the back surface of the groove. This is a method of attaching a folding ruled line.

The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a part showing an example of a plastic sheet with a folding ruled line obtained by the method for providing a folding ruled line of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. 1 and an example of an apparatus for providing a folding ruled line. 3 and 4 are partial cross-sectional views showing another example of a plastic sheet with folding ruled lines obtained by the present invention, and FIG. 4 is a partial cross-sectional view showing an example of a conventional plastic sheet with folding ruled lines.

In the present invention, as shown in FIG. 2, when the plastic sheet 2 is pressed between the ruled line blade 4 and the receiving base 5 to form the concave groove 11, the cutting edge of the ruled line blade 4 and / or the receiving base 5 is formed. Bent ruled line 1 characterized in that minute irregularities 3 are formed on the inner surface of the groove and / or the back surface of the groove by forming small irregularities 41 and 51 on the surface of the groove.
Is the method of attachment.

According to the present invention, as shown in FIGS. 1 to 3, minute irregularities 3 can be formed on the surface of the plastic sheet 2 along the folding ruled line 1 at the same time when the folding ruled line 1 is formed.

As the plastic sheet 2, a hard sheet such as polyvinyl chloride or polypropylene can be used.

The folding ruled line 1 is, for example, one in which a concave groove 11 is provided on one surface of the plastic sheet 2 as shown in FIGS. 1 and 2, or the range of the folding ruled line 1 as shown in FIG. It is also possible to use an appropriate shape such as the above, but not shown, in which a plurality of concave grooves are arranged in parallel on one surface or both surfaces.

The fine irregularities 3 may be arranged so that a large number of irregularities are made small within the width of the cross section of the folding ruled line 1. Generally, the concave or convex width is 5 to 100 μm, and the depth (height) is large. Is preferably about 5 to 100 microns. If the width or depth (height) is less than 5 microns, the effect is small and 1
If it exceeds 00 microns, the appearance will be adversely affected.

The position where the fine irregularities 3 are provided may be on the surface of the plastic sheet 2 along the folding ruled line 1,
It may be provided on both sides of the folding ruled line 1 as shown in FIGS. 1 and 2, or may be provided on only one side as shown in FIG.

It is considered that the fine unevenness 3 disperses and absorbs the bending stress to improve the bending property.

In the method of attaching a folding ruled line according to the present invention, for example, as shown in FIG. 2, a plastic sheet is provided between the ruled line blade 4 having the small unevenness 41 formed on the cutting edge and the cradle 5 having the small unevenness 51 formed on the surface thereof. By pressing 2 into the plastic sheet 2, a concave groove 11 is formed on one surface of the plastic sheet 2, and a minute unevenness 3 is formed on the inner surface of the concave groove 11 and the back surface thereof to obtain a plastic sheet 2 having a folding ruled line 1 shown in FIG. .

[0014]

According to the present invention, when the plastic sheet is pressed between the ruled line blade and the pedestal to form the concave groove, small irregularities are formed on the edge of the ruled line blade and / or the surface of the pedestal. According to the method for attaching a folding ruled line, the method comprises the step of forming minute irregularities on the inner surface of the groove and / or the back surface of the groove. / Or minute unevenness can be formed on the back surface of the groove, and bending stress is absorbed by the minute unevenness to facilitate bending, the bending angle becomes accurate when assembling a doll case or folding box, and flatness after assembly. Will be good.

[Brief description of drawings]

FIG. 1 is a perspective view of a part showing an example of a plastic sheet containing a folding ruled line obtained by a method for attaching a folding ruled line of the present invention.

2 is a partial cross-sectional view showing an example of a II-II cross-sectional view of FIG. 1 and a folding ruled line attaching device.

FIG. 3 is a partial cross-sectional view showing another example of a plastic sheet with folding ruled lines obtained according to the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a conventional plastic sheet with folding ruled lines.

[Explanation of symbols]

 1 Bending ruled line 11 Recessed groove 2 Plastic sheet 3 Micro unevenness 4 Ruled line blade 41 Small unevenness 5 Cradle 51 Small unevenness

Claims (1)

[Claims] 1. When the plastic sheet is pressed between the ruled line blade and the pedestal to form the concave groove, small irregularities are formed on the cutting edge of the ruled line blade and / or the surface of the pedestal to form the concave groove. A method for providing a bent ruled line, characterized in that fine irregularities are formed on the inner surface of the groove and / or the back surface of the groove.