JP2000218715A - Plastic sheet with crease - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate creasing, and setting-up, prevent cracks in the end part of a crease from being generated and prevent also the container from becoming bulged by providing the crease by leaving a specified area from the end part of a sheet on the extension of the crease. SOLUTION: When a planar plastic sheet 1 is fabricated by folding to the shape of a container, a crease 2 for folding is linearly set as a cut (fold) in the plastic sheet 1, in order to make an optional folding part of the plastic sheet 1 easily foldable at a desired angle. The crease 2 for folding is set excluding the area of a 0.5-5.0 mm (W1 and W2) from the end part of the sheet 1 in the extension of the crease 2. The plastic sheet 1 can be easily obtained by forming a resin composition consisting of polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene or the like into a hard or a semihard sheet, and punching the sheet to a specified shape. The thickness of the sheet is preferably about 0.1-1.0 mm.

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 ruled line. More specifically, the present invention relates to a plastic sheet with a folding ruled line suitable for a plastic packaging container such as a folding box.

[0002]

2. Description of the Related Art When assembling a container for packaging various products such as cosmetics using a plastic sheet, a 2x (2y) shown in FIG.
As shown in FIGS. 2 and 3), it is common practice to provide a folding line made of a concave groove (corresponding to 2 in FIG. 2 and 2 in FIG. 3) at the bent portion of the flat plastic sheet. I have.

[0003] However, as shown in FIG. 4, a conventional plastic sheet with a folding ruled line is provided with a folding ruled line from end to end of the sheet to be folded. When trying to assemble into a container while inserting a filler such as cosmetics by a machine or the like, when the plastic sheet is folded up and filled, the end of the bent portion is flipped up and cracks occur in this portion Had a fatal problem. As a solution to this, a method of increasing the strength of the folding ruled line portion by making the groove of the ruled line shallow, a method of inserting two ruled lines in parallel, and the like are performed. However, these methods have a drawback that when they are bent, they are difficult to bend to a desired angle of the container, so that the appearance of the container becomes poor when the container is formed. On the other hand, in order to finish to the desired angle and improve the appearance as a container, insert a deep ruled line,
If a method of reducing the bending stress of the folding ruled line portion or a method of improving the shape of the ruled line blade is used, there is a problem that the material is easily broken at the time of folding by an automatic filling machine or the like.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to easily fold and assemble a container by an automatic filling machine or the like, adjust the foldability, and to prevent a crack from being generated at the end of a folding ruled line. Further, an object of the present invention is to provide a folded-ruled plastic sheet in which an assembled container is finished at a desired angle without bulging to the outside of the sheet and a container having a good appearance as a packaging container is obtained.

[0005]

The inventor of the present invention has made intensive studies to solve the above-mentioned problems. As a result, the folding ruled line is 0.5 mm to 5.0 mm from the end of the sheet on the extension of the ruled line.
It has been found that the above problem can be solved by attaching the ruled line in the range of mm or by adding a pressing ruled line on the extension of the folding ruled line in this range, and completed the present invention.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a plastic sheet with a folded crease according to the present invention. The plastic sheet 1 preferably has a strength capable of taking in and out of and holding a product or the like to be stored, and particularly preferably has transparency. Such a plastic sheet 1 can be easily obtained by molding a resin composition composed of polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene or the like into a hard or semi-rigid sheet and punching it into a predetermined shape. The thickness of the sheet is 0.1 to
About 1.0 mm is preferable. Also, there is no problem even if the inner and outer surfaces of the sheet are decorated by printing, hot stamping or the like.

[0007] The folding ruled line 2 is formed of a plastic material so that, when the flat plastic sheet 1 is bent and processed into a container shape (three-dimensional shape), an arbitrary bent portion can be easily bent at a desired angle. These are linear cuts (folds) to be attached to the sheet. In the present invention, the folding ruled line 2 is provided so as to exclude an arbitrary range of 0.5 to 5.0 mm (W1 and W2) from the end of the sheet on the extension of the ruled line 2. If the folding ruled line 2 is provided within a range of less than 0.5 mm from the edge of the sheet, the problem that the folding ruled line 2 breaks when folded by an automatic filling machine easily occurs. On the other hand, the folding ruled line 2 is 5.
If there is a portion which is not provided beyond 0 mm, the bendability is inferior, and the assembled container bulges to the outside of the sheet, which causes a problem that the finished container cannot be finished at a desired angle.

The depth of the cut in the folding ruled line 2 is 20 to 20 times the thickness of the plastic sheet.
It is desirable to be in the range of 60%. As a result, the assembled container can be easily folded by the automatic filling machine without cracking, and the assembled container can be finished at a desired angle, so that the appearance as a packaging container is excellent.

The plastic sheet 1 is designed to be a rectangular column container having a trunk 3a, a trunk 3b, a trunk 3c and a trunk 3d, and a folding ruled line 2a.
, And the mating surface 4 and the outermost end of the body portion 3a are bonded to each other with an adhesive or the like to form the shape. The plastic sheet 1 is designed so that the lid 5 and the edge 7 are folded inward along the folding ruled line 2b so that the container can be covered. Lid 5
Has a folded portion 6 at the tip thereof, and is designed so that the lid can be fixed to the container by folding inward according to the folding ruled line 2c, and the boundary between the lid portion 5 and the folded portion 6 is formed. Side notches 8 are formed at both ends of the wire.

FIG. 2 is a partially enlarged perspective view of a plastic sheet with a folding ruled line using the folding ruled line 2 and a folding pressing ruled line 9. FIG. 3 is a cross-sectional view of the plastic sheet with a folded ruled line shown in FIG. FIG. The folding ruled line 9 is provided by embossing in a linear shape. It is desirable that the depth of the folding ruled line 9 is in the range of 30 to 50% with respect to the thickness of the plastic sheet. Further, it is desirable that the pressing ruled line 9 for bending is provided so as to be adjacent to and on the same line as the ruled line for bending 2 in a range where the ruled line for bending 2 is not provided. Thereby, while being able to maintain the easy folding property of the plastic sheet, it is possible to maintain the property that the folded ruled line portion is not easily broken due to folding and bending. In addition, the bending property can be adjusted, the occurrence of cracks when the box is folded up can be further prevented, the assembled container can be finished at a desired angle, and the appearance as a packaging container can be excellent. The folding ruled line 9 for bending is not limited to embossing, and may be formed by a hot blade or high-frequency heating.

[0011]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

(Example 1) A plastic molded article made of a transparent polypropylene sheet having a thickness of 0.3 mm was punched into a shape shown in FIG. 1 and 0.5 to 5.0 m from the end as shown in FIG.
m (W1: 0.5 mm, W2: 3.0 mm), leaving a ruled line for bending (2a,
2b, 2c: both ends of 2a remain the length of W2, and both ends of 2b, 2c leave the length of W1), and then a cosmetic (bottle container) is inserted into the interior by an automatic filling machine to 130 mm.
There were obtained 1000 square containers having a size of 50 mm x 30 mm. The container was bent at a desired angle (90 degrees), and had a good appearance as a packaging container. Also,
None of the containers cracked when the container was folded by the automatic filling machine. (Comparative Example 1) A plastic molded body having a thickness of 0.3 mm made of a transparent plastic sheet (same as in Example 1) was punched into a shape shown in FIG. .12 mm folding ruled line (2x, 2y, 2
After attaching z), 130 mm x 50 mm x 30 mm with cosmetics (bottle container) inserted inside by automatic filling machine
Of 1,000 square-pillar containers were obtained. Many of the containers were not bent at a desired angle (90 degrees), and had a poor appearance as a rounded packaging container. In addition, there were 260 pieces that had cracks when the containers were folded up by the automatic filling machine.

[0013]

Industrial Applicability The present invention is suitable as a packaging container in which the container can be easily turned upside down by an automatic filling machine, the assembled container can be finished at a desired angle without cracking, and the packaging container has an excellent appearance. It is a plastic sheet with folding ruled lines.

[Brief description of the drawings]

FIG. 1 is an example of a folded ruled plastic sheet according to the present invention.

[Explanation of symbols]

1. Plastic sheet with folded ruled lines 2a, 2b, 2c. Folding rule 3a, 3b, 3c, 3d. 3. torso Mating surface 5. Lid 6. Folding part 7. Edge 8. Side notch W1. Part where the folding ruled lines 2b and 2c are not attached W2. Part where the folding ruled line 2a is not attached

FIG. 2 is a partially enlarged perspective view of a plastic sheet with a folding ruled line using a folding ruled line 2 and a folded pressing ruled line 9 of the present invention.

[Explanation of symbols]

 1. 1. Plastic sheet with folding ruled line 8. Crease line for bending X-X '. Line drawn at right angles to ruled line 2 (ruled line 9)

FIG. 3 is a sectional view taken along line X-X 'of FIG.

[Explanation of symbols]

 1. 1. Plastic sheet with folding ruled line 8. Crease line for bending Crease line for bending

FIG. 4 is an example of a conventional plastic sheet with a folding ruled line.

[Explanation of symbols]

 1. Plastic sheet with folding ruled lines 2x, 2y, 2z. Folding ruled line

Claims (2)

[Claims] 1. A plastic sheet containing a folding ruled line provided with a folding ruled line, wherein the folding ruled line is 0.5 mm to 5.0 m from an end on an extension of the ruled line.
A plastic sheet with a folding ruled line, wherein the plastic sheet is provided so as to leave a range of m. 2. A pressing ruled line is provided on the same extension line as a folding ruled line in a portion where a bending ruled line is not provided in a range of 0.5 mm to 5.0 mm. A plastic sheet containing the folding ruled line according to 1.