JPH04128032A - Sheet member with folding ruled line - Google Patents

Abstract

PURPOSE:To make folding work easy and moreover to obtain excellent appearance by sticking thin plastic films on both surfaces of the core member composed of thick plastic sheet or paper. CONSTITUTION:The sheet member 10 with folding ruled line is composed of the core member 11 made of thick plastic sheet or paper and the thin plastic films 12, 12 stuck on both surfaces of the core member 11. While the folding ruled line 13 composed of the narrow long hole penetrating the core member 11 is provided at prescribed positions of the core member 11, the plastic films 12, 12 on both surfaces corresponding to the folding ruled line 13 are respectively squeezed into the folding ruled line 13 and area stuck to each other by the contact in its intermediate part. While in the sheet member 30 with folding ruled line, the plastic film or thin paper 12b to be stuck on one surface of the core member 11 is stuck onto the core member 11 in the shape of a plane, the plastic film 12c stuck onto the other surface is squeezed into the folding ruled line 13, and there the film 12c is stuck to the plastic film or the paper 12b on one surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite plastic sheet material provided with folding lines.

[Conventional technology]

When a plastic sheet is bent to be processed into a doll case, packaging container, etc., conventionally, as shown in FIG. 2 was formed, and the plastic sheet 1 was bent along the ruled lines 2.

[Problem to be solved by the invention]

However, the above-mentioned conventional folding and ruled plastic sheets are not easy to fold and are not strong enough when folded. There were problems such as the need for stress.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a folded and ruled sheet material that can be easily folded and can produce a case or the like with a good appearance.

[Means to solve the problem]

In order to achieve the above-mentioned object, the folded and ruled sheet material of the present invention has a core material made of a thick plastic sheet or paper material, and a thin plastic film is pasted on both sides of the core material, and the core material has a cut at the folded portion. Alternatively, it is characterized by having grooves formed therein.

〔Example〕

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

FIG. 1 is a cross-sectional view of a folded and lined sheet material showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a folded and lined sheet material showing a second embodiment, and FIG. FIG. 4 is a cross-sectional view of a folded and ruled sheet material showing an example, and a perspective view showing an example of the manufacturing process of the folded and ruled sheet material of the present invention.

First, the folded and ruled sheet material 10 shown in FIG. 1 includes a core material 11 made of a thick plastic sheet or paper material,
It is composed of a thin plastic film 12.12 bonded to both sides of the core material 11.
A folding line 13 consisting of a long hole passing through the core material 11 is provided at a predetermined position, and the plastic films 12 and 1 on both sides corresponding to the folding line 13 are provided at a predetermined position.
2 are respectively narrowed down within the folding ruled lines 13, abutted at the intermediate portions thereof, and are bonded to each other. In this way, fold the plastic film 12.12 on both sides along the ruled line 1.
3. By contacting and gluing inside 3, bend ruled line 1
The strength and accuracy of the three parts can be improved.

The plastic sheet or paper material forming the core material 11 may be appropriately selected depending on the size of the case, the type and weight of the contents, etc., and usually has a thickness of 0.1~1.
A hard and firm seat with a thickness of about 1.0 mm can be preferably used. In addition, the material of the plastic sheet is
Polyvinyl chloride polyethylene terephthalate 1 note, polypropylene.

Polyethylene, polystyrene, etc. can be used, and the paper material can be general cardboard.

Further, as the thin plastic film 12,
Polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene, etc. can be used, and the plastic films 12 bonded to both sides of the core material 11 may be the same, or may be plastic films of different thicknesses and types. Furthermore, a thin paper material may be used on one side of the core material 11 instead of the plastic film 12. The thickness of the plastic film 12 or the thin paper material can be appropriately selected depending on the size of the case, etc., but usually a thickness of about 0.005 to 0.0 degrees is preferably used.

The elongated hole forming the folding ruled line 13 can be formed in an appropriate shape depending on the bending angle and length of the portion, but usually the hole width is 5 times or more the thickness of the core material 11. It is preferable that the amount is less than twice that. If the hole width is less than twice the thickness of the core material 11, the corners of the core material 11 will hit during the bending process, making the bending process difficult, and the plastic film 12 will not be able to be squeezed into the elongated hole. 12 cannot be glued to each other, the strength and accuracy of the ruled line may be impaired, and if it is 5 times or more, the ruled line width will be too wide and the bending position will be inaccurate.
The dimensional accuracy of the assembled case may be impaired, the appearance of the case may deteriorate, and its strength may also be reduced.

The plastic film 12 or thin paper material can be pasted on both sides of the core material 11 by applying adhesive to the inner surface of the plastic film 12 or paper material and then pressing it onto the core material 11. If 11 is a plastic sheet, plastic film 12 and core material 1
1 can also be thermally fused.

Furthermore, by using a transparent plastic sheet for the core material 11 and using a transparent material for the plastic film 12, a case with transparency can be obtained. Appropriate printing can also be performed on. Furthermore, a suitable combination of a plastic sheet and paper can also be used as the core material 11.

Next, a folded and ruled sheet material 20 shown in FIG. 2 is a folded and ruled sheet material having the same structure as described above, in which the folded and ruled lines 13 are formed by long grooves that do not penetrate the core material 11, and one of the long grooves is formed on the side where the long grooves are formed. The folded and ruled sheet material 30 shown in FIG. 3 is a plastic film that is adhered to one side of the core material 11 in the folded and ruled sheet material having the same structure as described above. Or thin paper material 12
At the same time, the plastic films 1 and 2 c to be attached to the other surface are folded and narrowed within the ruled lines 13, and the film 12c and one of the plastic films or thin paper material 12 b It is made by gluing these together. Such a configuration is suitable when using one of the plastic films or a thin paper material, or when it is difficult to narrow it down within the folding ruled line 13 due to its flexibility, especially when using paper material.

Such a folded and ruled sheet material can be continuously manufactured, for example, by the means shown in FIG. That is, a long core material 11 having predetermined elongated holes or long grooves formed at predetermined positions to form folded ruled lines 13 is sent out, and from both sides of the core material 11, a thin sheet with a roughened adhesive applied to the surface facing the core material 11 is fed out. The plastic film 12 or thin paper material may be supplied and pressed using a suitable pressure roll 14, 14 to bond the core material 11 and the plastic film 12 or thin paper material on both sides thereof. After that, the predetermined cutting line 1
A desired case can be obtained by cutting it out according to 5, bending it according to the folding ruled line 13, gluing it with glue 16, and assembling it.

In addition, if the folding ruled line 13 consisting of an elongated hole is long,
The strength of the bent ruled line portion can be improved by forming the elongated holes discontinuously or by providing a bent ruled line portion consisting of long grooves having the shape shown in the second embodiment in a part thereof. Further, in the case where the folding ruled lines are formed by long grooves, it is also possible to process the long grooves after attaching the plastic film 12 to both surfaces or one surface of the core material 11.

〔Effect of the invention〕

As explained above, the folded and ruled sheet material of the present invention is constructed by laminating thin plastic films or thin paper materials on both sides of a core material in which cuts or grooves are formed in the folded portion. It has excellent bendability and sufficient strength, and by using the folded and ruled sheet material of the present invention, cases, containers, etc. that are excellent in appearance and strength can be obtained.

In addition, because plastic film or paper material is pasted on both sides of the core material, the adhesive is not exposed on the inside of the case or container, so it can also be used for food storage.
Furthermore, since recycled paper can be used as the core material, resources can be used more effectively.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a folded and lined sheet material showing a first embodiment of the present invention, and Fig. 2 is a sectional view of a folded and lined sheet material showing a second embodiment. FIG. 3 is a cross-sectional view of a sheet material with folded lines according to the third embodiment, FIG. 4 is a perspective view showing an example of the manufacturing process of the sheet material with folded lines of the present invention, and FIG. 5 is a cross-sectional view of a sheet material with folded lines according to the third embodiment. It is a sectional view showing an example of a filled sheet material. ]0...Folded ruled sheet material 11...Core material
12. Bend ruled line

Claims (1)

[Claims] 1. Thin plastic films are bonded to both sides of a core material made of a thick plastic sheet or paper material, and the core material is characterized in that cuts or grooves are formed in the folded portion. Sheet material with foldable lines. 2. The folded and ruled sheet material according to claim 1, wherein one of the thin plastic films is replaced with a paper material.