JPH0764012B2 - Plastic sheet with folding line - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Bending a plastic sheet,
When processing into a doll case, packaging container, etc., a bending line is attached and bending is performed along this line. As shown in the partial sectional views of FIGS. 3A, 3B and 3C, the folding line formed on the conventional plastic sheet with folding lines is, for example, the grooved ruled line 3 which is recessed in the thickness direction only on one surface of the plastic sheet 2. One or a plurality of them are provided, or a pair of ruled lines 3 are provided at corresponding positions on the front and back of the plastic sheet 2.

[0003]

The above-mentioned conventional plastic sheet with folding lines is not sufficiently foldable, and when it is bent, it does not finish at a predetermined angle, or the flat surface after processing is curved due to residual stress. However, when a pair of ruled lines 2 are provided on the front and back sides, it is difficult to adjust the depth of the ruled lines, and the easiness of bending is unstable.

[0004]

The present invention is intended to improve the foldability of a plastic sheet with a fold line, and will be described below with reference to the drawings.

FIG. 1 is a perspective view of a portion showing an example of a plastic sheet with folding lines according to the present invention, and FIG. 2 shows another example of the plastic sheet with folding lines according to the present invention and an example of a folding line attaching apparatus. FIG. 3 is a partial cross-sectional view, and FIG. 3 is a partial cross-sectional view showing an example of a conventional plastic sheet with folding lines.

As shown in FIGS. 1 and 2, the present invention provides a plastic sheet with a folding line in which the folding line 1 is formed within the thickness of the plastic sheet 2 and one surface of the plastic sheet 2 is recessed. The two ruled lines 31 and 32 that are formed and the two ruled lines 3 on the other surface
The present invention relates to a plastic sheet with a fold line, which comprises a ruled line 33 provided by denting the other surface at a position corresponding to the middle of 1, 32.

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

The folding line 1 is formed within the thickness of the plastic sheet 2 as described above, and is formed by denting from each surface, two on one surface and one on the other surface. It is composed of a total of three ruled lines, and the bending stress is dispersed by these three ruled lines. In addition,
The bending direction is effective whether it is front or back, but 2
It is easier to fold the book with the ruled lines 31 and 32 inside.

Since each ruled line is formed by being recessed within the thickness of the plastic sheet 2, the folding line 1 is thinly finished, and the ruled lines on both sides are arranged so as to be offset from each other, so that the ruled line is formed within the thickness of the plastic sheet 2. Even though it is formed, the narrow pressure does not concentrate and does not become too thin when the ruled line is installed.

The ruled lines 31, 32, 33 may be arranged close to each other so that the folding lines do not become so wide as to adversely affect the appearance, and the depth thereof is usually preferably 5 to 50% of the thickness of the plastic sheet 2.

In order to manufacture the plastic sheet with folding lines of the present invention, for example, as shown in FIG. 2, a ruled line blade 4 having two cutting edges 41 and 42 corresponding to two ruled lines 31 and 32, and A plastic sheet having the folding lines 1 by providing the ruled lines 31, 32, 33 is obtained by narrowing the pressure between the receiving base 5 and the receiving base 5 having the single blade edge 53 projecting at a position corresponding to the middle of the blade edges 41, 42. . The ruled line blade 4 and the cradle 5 are roll-shaped blades 41, 42, 53
It may be a projecting one.

[0012]

As described above, the plastic sheet with folding lines according to the present invention is formed within the thickness of the plastic sheet and has two ruled lines formed by denting one surface and other ruled lines. Since there is a fold line consisting of one crease line provided by denting the other surface of the sheet at a position corresponding to the middle of the two crease lines, the folding stress applied to both sides of the plastic sheet is three. Since it is easily absorbed by the ruled lines and can be bent, and the residual stress is small, the bending angle is accurate when the doll case and the folding box are assembled, and the flatness after assembly is good. Also, since the ruled lines on both sides are arranged offset from each other, even if the ruled lines are formed within the thickness of the plastic sheet, a narrow pressure is not concentrated and too thin when the ruled lines are installed, and the ease of bending is stable. is doing.

[Brief description of drawings]

FIG. 1 is a perspective view of a portion showing an example of a plastic sheet with folding lines according to the present invention.

FIG. 2 is a partial cross-sectional view showing another example of the plastic sheet with folding lines and one example of the folding line attaching apparatus of the present invention.

[Fig. 3] 1 of a conventional plastic sheet with a folding line
Partial cross section showing an example

[Explanation of symbols]

 1 Bending line 2 Plastic sheet 3, 31, 32, 33 Ruled line

Claims (1)

[Claims] 1. A plastic sheet with a folding line, wherein the folding line is formed within the thickness of the plastic sheet.
And two ruled lines formed by denting one surface and one ruled line provided by denting the other surface at a position corresponding to the middle of the two ruled lines on the other surface. A plastic sheet with a fold line characterized by consisting of