JPH07304122A - Method of forming package - Google Patents

Abstract

(57) [Summary] [Purpose] Does not break even after repeated bending.
(EN) Provided is a packaging body that can be folded so that opposing surfaces are close to each other. [Structure] A polypropylene sheet 1 is formed with a blade 3 to form notches 2 for folding. The sheet 1 is folded through the folding notch to form a package such as a container, a lid, and a case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming packages such as containers, lids and cases.

[0002]

2. Description of the Related Art Conventionally, a vinyl chloride sheet has been used as a material to form a package such as a container, a lid or a case. That is, in the prior art, a vinyl chloride sheet is provided with a heat welder or a groove 11 for bending having a V-shaped cross section with a press die 10 in the vinyl chloride sheet 1 as shown in FIG. 8 (a). This groove portion 11 was bent to form a package such as a container, a lid and a case.

However, since the above-mentioned conventional one uses the vinyl chloride sheet 1 as a material, there is a problem that the bottom of the groove portion 11 is cracked when the groove portion 11 is repeatedly bent, and it cannot cope with repeated folding back. There was a problem. In addition, there are cases in which, for example, folding and stacking and storing or transporting are performed until a package such as a container, a lid, and a case is assembled. In such a case, conventionally, a V-shaped cross section is formed by pressing. 8A and 8B, when the vinyl chloride sheet 1 is pressed by the press die 10 as shown in FIG. 8A, the groove portion 11 of FIGS. 8A and 8B is formed. The parts with dots on both sides and the bottom of the groove are compressed and denser than other parts, and when this is bent at the groove 11 part, the repulsion of the dense parts on both sides and the bottom of the groove 11 As shown in Fig. 8 (c), it does not curl back and back to back, and as a result, there is a gap in part a, which makes it impossible to fold it so that it is in perfect contact, so it can be stored or transported. The there is a problem that volume is high in the case of folded, also there is a problem that crack and folding it unreasonable to snugly.

Further, when the groove portion is formed by the heat welder, the vinyl chloride sheet is compressed and becomes dense on both sides of the groove portion in a state where heat is applied, and there is a problem similar to the case of the above-mentioned press.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. The object of the present invention is to prevent breakage even after repeated bending, and for the facing surface. Another object of the present invention is to provide a method of forming a package that can be folded so that the two are close to each other.

[0006]

According to the method for forming a package of the present invention, a polypropylene sheet 1 is formed with a cutting notch 2 for folding with a blade 3, and the sheet 1 is bent through the notch for folding to form a container, The present invention is characterized in that a packaging body 4 such as a lid and a case is formed, and by adopting such a method, the problems of the conventional example described above are solved and the object of the present invention is achieved. Is.

[0007]

However, since the polypropylene sheet 1 is used as the sheet 1 and the folding notch 2 is made by the blade 3 in the sheet 1, the sheet 1 is compressed at both sides of the folding notch 2 like a press so as to be dense. Therefore, when folding is performed centering on the cut 2 portion, it is possible to perform folding so that the facing surfaces are in contact with each other. Further, since the sheet 1 is made of polypropylene, repeated bending can be performed without breaking even when the bending is repeated at the cut 2 portion for bending.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. In FIG. 1, 5 is a mounting table, 6 is an elevating body arranged above the mounting table 5, and the elevating body 6 is vertically movable by an elevating device (not shown). A thin blade 3 is provided on the lower surface of the lifting body 6. Then, with the lifting body 6 pulled up, the polypropylene sheet 1 is placed on the mounting table 5, and then the lifting body 6
Is lowered, and a notch 2 for folding is made in the polypropylene sheet 1 with a blade 3 provided on the lower surface of the elevating body 6. In this case, the cut 2 for bending is cut so as to leave the dimension α as shown in FIG.

During the above steps, the polypropylene sheet 1 is cut out in advance to an outer shape corresponding to a developed view of the packaging body 4 such as a container, a lid and a case, and an outer shape corresponding to the developed view of the packaging body 4. The table cut out into 5 pieces
It may be placed on the table and the elevating body 6 may be lowered to make the folding cut 2 by the blade 3, or at the same time when the elevating body 6 is lowered and the blade 3 is made to make the folding cut 2. It is also possible to cut out the outer shape corresponding to the developed view of the package 4 with the outer shape cutting blade. In this case, the outer shape cutting blade is attached to the elevating body 6 or to another elevating body, but in any case, the outer shape cutting blade completely cuts the polypropylene sheet 1.

The packaging body material 4'having the outer shape of the packaging body 4 such as the container, the lid and the case and having the cut 2 for folding as described above is, for example, as shown in FIG. 2 or FIG.
FIG. 7A is a development view as shown in FIG. Here, the example of FIG. 2 will be described. The packaging material 4 ′ is bent by using the bending notch 2 portion, and the connecting piece 8 and the opposite piece are adhered by an adhesive as shown in FIG. The case which is the package 4 is assembled. Although it may be used as it is as a case, it may be temporarily folded at the notch 2 for folding as shown in FIG. 4 to reduce its volume for storage or transportation, and again when necessary, as shown in FIG. Thus, the three-dimensional shape is used as the packaging body 4. In this case, since the cut 2 is formed by cutting the polypropylene sheet 1 with the blade 3, there is no possibility that both sides and the bottom of the groove are compressed and become dense as in the case of forming a groove by a conventional press. , That is, the sides and bottom of the cut 2 are not dense, and therefore
When folded from the state of FIG. 5A at the two cuts as shown by the arrow, it can be folded so that the facing surfaces of the pieces 1a and 1b are close to each other as shown in FIG. 5B. Since the polypropylene sheet 1 has excellent resistance to repeated bending, the bent portion will not be broken even if bent several times at the notch 2, and will not be broken even if it is wrongly bent.

[0011]

According to the present invention, as described above, a polypropylene sheet is used to form a folding cut, and the sheet is folded through the folding cut to form a container,
Since a packaging such as a lid and case is formed, both sides of the notch for bending are not compressed and become dense as with a press, and as a result, when folding around the notch, the opposite surface It can be folded so that it touches each other, it can be folded compactly and neatly, and since the sheet is polypropylene, it does not crack even if it is repeatedly bent at the notches for bending, and it can be folded repeatedly. Is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the order of forming a folding cut according to the present invention.

FIG. 2 is a plan view of the packaging material of the above embodiment.

FIG. 3 is a perspective view of a package formed by assembling the above package material.

FIG. 4 is a perspective view showing a state in which the above-mentioned package is folded.

5A and 5B are explanatory views showing the packaging material before and after folding, in which FIG. 5A is a sectional view taken along line XX of FIG. 2 and FIG. 5B is a sectional view taken along line YY of FIG. is there.

FIG. 6 (a) is a plan view of another embodiment of the packaging material formed according to the present invention, and FIG. 6 (b) is a perspective view of the packaging formed by assembling the above packaging material.

FIG. 7A is a plan view of yet another embodiment of the packaging material formed according to the present invention, and FIG. 7B is a perspective view of the packaging formed by assembling the packaging material.

FIG. 8 shows a conventional example, (a) is a cross-sectional view of a state where a groove is formed in a sheet by pressing, (b) is a cross-sectional view of the groove formed by the same as above, and (c) is the same as above. FIG. 6 is a cross-sectional view showing a problem when folded at the groove portion of FIG.

[Explanation of symbols]

 1 Polypropylene sheet 2 Notch 3 Blade 4 Package

Claims (1)

[Claims] 1. A wrapping body characterized by forming a folding cut with a blade on a polypropylene sheet, and folding the sheet through the folding cut to form a package such as a container, a lid, or a case. Forming method.