JPH0676091B2 - Packaging case and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging case formed by bending a synthetic resin sheet into a box shape, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a packaging material for confectionery, cosmetics, small articles and the like, a synthetic resin packaging case called a clear box or a clear package whose contents can be seen at a glance is often used.

In this packaging case, a transparent synthetic resin sheet is formed with a folding scribe line by pressing, and the synthetic resin sheet is folded into a box shape from the scribe line as shown in FIG. It is formed by adhering the side edges of the combined sheets.

[0004]

By the way, vinyl chloride is usually used as the synthetic resin sheet. However, since such a vinyl chloride sheet has a great elasticity, it is pressed by a die. A strong restoring force remains even after forming, and therefore, when a folded case is assembled, corners do not form an acute angle and each surface cannot maintain a flat box shape. Therefore, it is difficult to automatically fill the contents in the case using the automatic filling machine, and there is a problem that the work efficiency cannot be improved,
There is a drawback that the cases cannot be stably stacked, and the cargo easily collapses during display or loading.

In order to solve such a drawback, a packaging case has been proposed in which the wire of the synthetic resin sheet is heated and melted so that the corner portion can be bent at an acute angle. But,
Since the thus-melted tie line portion hardens and becomes extremely brittle, there is a drawback that cracks easily occur due to a bending operation, and the tie line portion is cut.

Further, since vinyl chloride produces toxic gas when incinerated, instead of it, polypropylene (hereinafter P
P) and polyethylene terephthalate (hereinafter PET)
However, since PP and PET are harder than vinyl chloride, they are easily cracked when assembled by bending, and processing is difficult. I have a difficult problem. In particular, regarding processing, there is no suitable adhesive capable of applying PET or the like, and there is a drawback that mass production by automatic assembly cannot be achieved.

In view of this, the present invention provides a packaging case that can be bent at an acute angle without causing cracks in the corners, and that the case can be securely joined regardless of the material of the synthetic resin sheet. It is intended to provide a manufacturing method.

[0008]

In order to solve the above-mentioned problems, in the packaging case of the present invention, cuts are formed over almost the entire length in a bent portion of a synthetic resin sheet, and a flexible paper sheet is joined to the cuts. It is a structure.

Further, according to the manufacturing method of the present invention, the paper sheet is adhered to the synthetic resin sheet formed in the expanded shape of the box,
A fold line is formed by forming a cut line in the adhesive portion of the synthetic resin sheet with the paper sheet, and the synthetic resin sheet and the paper sheet are bent from the crease line to assemble the packaging case.

[0010]

In the packaging case and the manufacturing method described above, the paper sheet is adhered to the notch of the synthetic resin sheet and the bent portion is joined to the paper sheet, so that the corner portion of the case is flexed flexibly and cracks occur. It can be bent at an acute angle without.

Further, since the synthetic resin sheets are joined via the paper sheet, the case can be joined surely regardless of the adhesiveness of the synthetic resins.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a synthetic resin sheet, 2 is a paper sheet, the synthetic resin sheet 1 is formed in a developed shape of a packaging case, and a cutting portion 3 is formed in advance between a lid plate and a flap at both ends. .

Further, the paper sheet 2 is formed to have substantially the same outer shape as the synthetic resin sheet 1, a cut portion 4 is formed corresponding to the cut portion 3 of the synthetic resin sheet 1, and a plurality of see-through windows are provided inside. 5, 6, and 7 are formed.

As shown in FIG. 2, one side edge of the paper sheet 2 projects outwardly in a state of being superposed on the synthetic resin sheet 1 and forms a paste margin 8 for adhesion. Further, each of the see-through windows 5, 6, and 7 has a side plate 1a and both end plates 1b of the synthetic resin sheet 1 in a state where both sheets 1 and 2 are stacked.
It is located at the center of 1c, and the folding ruled line 9 is entirely located at the portion where the paper sheet 2 and the synthetic resin sheet 1 overlap.

The above synthetic resin sheet 1 and paper sheet 2 are
An adhesive is applied to the surface of the paper sheet 2, the synthetic resin sheet 1 is superposed on it, and then pressure is applied from above to adhere them.
In this case, since the paper sheet 2 is easily adhered with most of the adhesives, the adhesive can be selected without being significantly affected by the material and characteristics of the synthetic resin sheet 1, and can be selected in a wide range.

When both sheets 1 and 2 are adhered as described above, a cutting blade is inserted from above the synthetic resin sheet 1 along the folding crease 9 to form a cut, and as shown in FIG. Cut only sheet 1. Even if the synthetic resin sheet 1 is cut in this manner, the both sides of the cut portion are joined by the paper sheet 2, so that the synthetic resin sheet 1 does not fall apart,
It retains its original shape.

Then, the two sheets 1 and 2 are bent along the score line 9, and the other side edge of the paper sheet 2 is adhered to the seam allowance 8 of the paper sheet 2 protruding outward.

The packaging case A assembled in this way is
When bent along each ridge line 9, as shown in FIG. 4, the synthetic resin sheet 1 is separated at the ridge line portion and only the paper sheet 2 is folded, so that the corner portion is bent very smoothly. Can be bent at an acute angle. Therefore, the packaging case can be easily assembled into an accurate box shape from the folded state, and the contents can be automatically filled by the automatic filling machine.

Further, since the corner portions have an acute angle and the finish of each surface is flat, a large number of packaging cases can be stably stacked and the load does not collapse during loading.

Further, since the corner portions are joined by the flexible paper sheet 2, even if the bending operation is repeated, no breakage or cracking occurs and the quality is guaranteed.

In the above structure, the synthetic resin sheet 1 is separated at the corners, and the synthetic resin sheets are joined to each other via the paper sheet 2 without being joined to each other. Any resin material can be selected irrespective of mechanical properties such as hardness and elasticity, or adhesive performance. That is, PP and P are exactly the same as vinyl chloride.
ET or the like can be used, and a pollution-free packaging case that does not generate toxic gas can be formed.

On the other hand, the paper sheet 2 is not particularly limited in its material, but it is preferable that it is flexible and easily bendable, and furthermore, the synthetic resin sheet 1 is subjected to the cutting process of the ruled lines and the bending operation repeatedly. It is desirable to use a strong material that does not break.

In the conventional packaging case, as shown in FIG. 7, an insert 13 made of paper on which a design, a product name, etc. are printed.
Is often stored in the case A ′ together with the product, but in the packaging case of the embodiment, the desired design or the like can be printed on the paper sheet 2 in advance, so that the insert is stored. There is an advantage that the work to be done can be omitted and the work efficiency can be greatly improved.

Further, in the above-mentioned embodiment, the paper sheet 2 is formed to have substantially the same shape as the synthetic resin sheet 1, but the paper sheet may be adhered only to the corner portion of the synthetic resin sheet 1.

Further, the formation of the cut line at the bent portion of the synthetic resin sheet 1 does not involve separating the entire ridge line 9, but FIG.
It is also possible to leave only the vicinity 10 of both ends of the ridge 9'joined as shown in Fig. 3 and to cut most of the other ridges, which is the same as the above-mentioned whole separated. Can exert the action of.

Further, the cut line formed in the synthetic resin sheet 1 does not completely cut the synthetic resin sheet as in the above-mentioned example, but a cut line 11 shown in FIG.
The synthetic resin sheet 1 may be scraped off while leaving a part thereof. Further, the tip portion of the cut may not be formed in an acute angle shape, but may be formed in a shape having a rounded tip by a heat melting process, as in the cut 12 shown in FIG. When a part of the synthetic resin sheet 1 is formed to have a small thickness by the cuts 11 and 12 as described above, the flexibility and bendability of the sheet 1 at the part are improved, and therefore the corner portion of the packaging case may be bent at an acute angle. it can.

[0027]

[Effects] As described above, according to the present invention, the cut portion is formed in the bent portion of the synthetic resin sheet, and the paper sheet is joined to the cut portion. It can be assembled into a simple box shape. Therefore, the surface finish is flat and the commercial value is increased, the contents can be automatically filled, and in addition, stable case stacking can be achieved.

Further, since the synthetic resin sheet is joined via the paper sheet, any synthetic resin sheet can be selected regardless of the mechanical strength and adhesive performance of the resin material, and a pollution-free package that does not generate toxic gas. There is an advantage that the case can be formed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a packaging case of an embodiment with a sheet disassembled.

FIG. 2 is a plan view showing a bonded state of the above sheets.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

4A is a perspective view showing an assembled packaging case, and FIG. 4B is an enlarged sectional view showing a bent portion of the packaging case.

FIG. 5 is a plan view showing another example of the cutting shape of the ruler line.

FIG. 6 is a sectional view showing another example of the break.

FIG. 7 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 Synthetic resin sheet 2 Paper sheet 5, 6, 7 Transparent window 8 Glue margin 9 Fluorescent line A Packaging case

Claims (2)

[Claims] 1. A packaging case formed by bending a synthetic resin sheet into a box shape, wherein cuts are formed over substantially the entire length in the bent portion of the synthetic resin sheet, and a flexible paper sheet is joined to the cuts. A packaging case characterized by. 2. A flexible paper sheet is adhered to a synthetic resin sheet formed in a box-shaped shape, and a cut line is formed in a portion where the synthetic resin sheet is adhered to the paper sheet to form a folding ruler. , A method of manufacturing a packaging case, characterized by bending a synthetic resin sheet and a paper sheet from the line to assemble the packaging case.