JP2010285180A - Packaging plastic case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging plastic case assembled into the shape of a hexahedron by folding a sheet of a predetermined shape, the case being able to be molded and assembled at a low cost and formed into a solid shape by securely and easily opening a sheet folded in two. <P>SOLUTION: The sheet S composing the case is formed such that, of folding ruled lines 1, 2, 3, and 4 between a front portion A, a rear portions B, and left and right side portions C and D, the folding ruled line 1 between the front and side portions A and C forms a curve having a portion deviating from a line X connecting the upper and lower ends of the ruled line 1. In addition, the folding ruled line 3 between the rear and side portions B and D has a curve parallel to the ruled line 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plastic case for packaging suitable for storing cosmetics, daily necessities, and other articles for sale and display.

As a container for packaging habitats such as cosmetics, a sheet molded from a highly transparent plastic is punched out, for example, front A, rear B, left and right side C, D, upper and lower lid surfaces as shown in FIG. A sheet S having a shape having each of E, F, adhesive margin surface G and insertion surface H is formed, and this sheet S is formed into a cylindrical shape by adhering the adhesive margin portion G to the side surface portion C, and is attached to the surface of the sheet. A case is used in which each surface portion is bent along the folded ruled lines 1 to 7 and assembled into a hexahedron.
In such a case, as shown in FIG. 4B, the sheet S formed into a cylindrical shape is ruled line 1 between the front part A and the side part C, and the ruled line 3 between the back part B and the side part D. Are folded and flatly folded into a flat shape and used for storage and transportation. As shown in FIG. (C), when the article is packaged, the half-folded sheet S is opened and three-dimensionalized. Although it is assembled in a box shape, both the case where the assembly is performed manually and the case where it is performed by an automatic box making machine may cause an obstacle to the above-described three-dimensional operation depending on the storage state of the sheet S.
That is, when a large number of folded sheets S are stored in a stacked manner, the lower sheet S receives the weight of the upper sheet S group, and as shown in FIG. The part C, the back part B and the side part D are in close contact with each other in parallel and are almost completely folded into two, and there is no gap between the overlapping surface parts, or the gap between the overlapping surface parts becomes extremely narrow. It takes time to expand. In particular, when the sheet S has low rigidity and the ruled lines 1 and 3 are hard, it is difficult to open. In that case, when inward force is applied to both side edges of the folded sheet S, as shown in FIG. In addition, the entire sheet is bent at the center of the ruled lines 2 and 4 while curving in the shape of a "<", which makes it difficult to assemble with an automatic box making machine.

In order to eliminate such a problem that occurs when the folded sheet S is stored in an overlapping manner, among the folding ruled lines between the surface portions of the sheet S, the breaking strength of the folded ruled lines 1 and 3 that are folded when folded in half. The bending strength of the folding ruled lines 2 and 4 between them is set to be small, and the repulsive force acting in the warp direction that acts between the surface portions when the sheet S is taken out from the storage place spreads between the overlapping surface portions. A case having a configuration provided in (1) is known (for example, see Patent Document 1).
In addition, a bending crease is preliminarily applied to the ruled line 4 located near the center in a state where the sheet S is folded in two, and when the sheet S is taken out from the storage place, the sheet S is folded due to the repressing urging force of the bending crease. There is known a case of a configuration in which a gap having an appropriate width is formed between upper and lower surface portions without closely contacting each surface portion (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-130050 JP 2001-171650 A

With the configuration of the conventional case, it is possible to solve the problem that the folded sheet S is difficult to open.
However, the different bending strengths of the folded ruled lines are such that the width, depth, and shape of the grooves constituting the ruled lines are set so that the repulsive force in the warping direction is effective when the sheet S is folded in half. It is necessary to adjust the rupture strength precisely by changing it at the same time. In addition, the process using creases requires a process of imparting creases in the sheet S formation process, and the processing cost of the case must be increased. Absent.

  In view of such problems of the prior art, the present invention is a packaging plastic case that can be assembled into a hexahedron by folding a sheet of a predetermined shape, and the case can be molded and assembled at low cost, and is folded in two. It is an object of the present invention to make it possible to reliably and easily open a sheet to form a sheet and to assemble it into a box shape.

In order to solve the above-mentioned problems, the present invention is a case in which a plastic sheet having a predetermined shape is folded and assembled into a hexahedron, and among the folding ruled lines between the front, back and left and right side surfaces of the case, the front portion and one side of the case. The bent ruled line between the side surfaces is provided in a shape having a portion deviated from the line segment connecting the upper and lower ends of the ruled line, and the bent ruled line between the back side and the other side is provided in a shape parallel to the ruled line. It has the structure.
The “line segment connecting the upper and lower ends of the ruled line” refers to a virtual line segment between the upper and lower ends of the ruled line when a single straight line passing through the upper and lower ends of the ruled line is assumed. . In the present invention, the ruled line that is folded when the sheet is folded in half is provided so as to have a portion that is off the line segment by, for example, providing a curve between the upper and lower ends of the ruled line.
In addition, the “front, back and left and right sides of the case” refers to any of the four sides excluding the top and bottom lid surfaces of the hexahedron case as “front”, the opposite side as “back”, and the plane between them. It is the “left and right side surfaces”, and the surface facing the front side when displaying the case is not necessarily the “front side of the case”.

  The present invention is a box-shaped plastic case for packaging having front, back, left and right side surfaces, and upper and lower lid surfaces, and the front, back, left and right side surfaces, and adhesive margin surface sandwich four folding ruled lines. A large number of plastic sheets having a shape continuously connected to each other are bonded to the side surface portion to form a cylindrical shape, and the plastic sheet is folded into two folds by two of the ruled lines. It is applied to a case where a two-fold sheet is three-dimensionalized and assembled into a hexahedron when the article is stored and transported and the article is packaged.

According to the present invention, the ruled line between the front part and the side part on one side adjacent to the front part, and the ruled line between the back part and the side part on the other side adjacent to the back part, that is, diagonally formed into a box shape. The pair of ruled lines that are positions are not provided linearly, but are provided in shapes that have portions that deviate from the line segments that connect the upper and lower ends of the ruled lines and that are parallel to each other when the sheet is unfolded.
Therefore, when the sheet provided in a cylindrical shape is folded in the two ruled lines to be folded in two, the surface portions on both sides of both ruled lines are twisted with each other, that is, the front and one side portions are twisted across the ruled line, The back part and the side part on the other side are twisted, and stress is applied to the surface parts on both sides of both ruled lines in the direction of expanding each other with the ruled line as an axis, so that the upper and lower surface parts of the folded sheet overlap exactly. In other words, a gap is generated, and a large gap is formed between the upper and lower surface portions in the central portion of the sheet. And when assembling the case, if inward force is applied to both side edges of the folded sheet, a gap is secured between the upper and lower surface parts, so that the overlapping sheets open smoothly, easily three-dimensionalized and boxed Shape case can be assembled.
Also, even if the sheets underneath the stacked sheets are flattened due to a vertically downward load, such as by stacking many folded sheets before assembling the case, the sheets can be removed from the storage location. Since the surface portions on both sides of the ruled line are twisted with each other, the flat sheet is restored to the original shape by the stress acting around the axis of the ruled line, and a gap with an appropriate width is formed between the upper and lower surface portions. Even if inward pressure is applied to both side edges of the sheet, the sheet does not bend in the shape of a "<", and the sheet can be three-dimensionally smoothly.

In the plastic case having the above configuration, the folding ruled lines between the front part and the side part on one side and between the rear part and the other side part are both folded when the cylindrical sheet is folded in both ruled lines. It is preferable to provide it in a shape in which the degree of twisting of the surface portions on both sides is increased. For example, it can be provided in a shape having a curved portion to one side of a line segment connecting the upper and lower ends of the ruled line, or can be provided in a shape having curved portions to both sides of the line segment.
As a shape having a curved portion to one side of the line segment, a shape in which a ruled line gently protrudes from the left or right side of the line segment, a shape bent into a substantially V shape, or a stand Examples include a bent shape. In addition, as a shape having a curved portion on both sides of the line segment, a ruled line is bent in an S-shape to the left and right centering on the line segment, or the waveform is continuously and alternately projected to the left and right of the line segment. Shape. It is preferable that the ruled line is constituted by a curve so that stress is applied by twisting the surface portions on both sides of the ruled line even when a load is applied to the folded sheet.
In addition, the ruled line located between the two ruled lines, between the front part and the other side part and between the rear part and the one side part, is a straight line shape along the line segment connecting the upper and lower ends of the ruled line. Can be provided.

In the above-described configuration, the material of the sheet constituting the case is composed of a bio-derived resin such as polyethylene terephthalate, polypropylene, polyethylene, polycarbonate, or polylactic acid having good folding resistance, other resin alone or a composite thereof. Plastic sheets can be used. In particular, a sheet made of polyethylene terephthalate is preferable in terms of good transparency and high rigidity. Among them, amorphous PET (A-PET) is more transparent and unstretched, and therefore has a strength regardless of the direction of the sheet. It is preferable at a high point.
The thickness of the sheet can be set to 0.1 to 0.8 mm. If it is thinner than 0.1 mm, the surface portion is likely to bend or break, and if it is thicker than 0.8 mm, the pressure required for bending increases. Considering folding resistance and rigidity, it is preferable to set the thickness to 0.2 to 0.6 mm.

Regardless of the type of folding ruled line attached to the sheet, a ruled line with slits such as perforations, a depressed ruled line with slits, a ruled line with V-shaped, U-shaped, trapezoidal grooves intermittently or continuously, Appropriate types of ruled lines that can bend the sheet along the ruled line, such as a two-level ruled line with a two-step groove inside the groove, and a ruled line in which streak-like grooves are arranged in parallel and close together, the dimensions of the case, the sheet material, It can be set as appropriate according to the rigidity, thickness, and the like.
In addition, how much the ruled line is formed with respect to the line connecting the upper and lower ends of the ruled line, or how much the degree of curvature can be set, can be set appropriately according to the material, rigidity, thickness, etc. of the sheet It is. In the case of a 0.1-0.8 mm thick sheet made of A-PET, the size of the deviation width from the line segment or the degree of curvature is in the range of 0.1-2.0 mm with respect to the ruled line length of 100 mm. It is preferable to set.

It is an expanded view of the sheet | seat which comprises the plastic case of 1st embodiment of this invention. FIG. 2 is a cut end view when the sheet of FIG. 1 is folded in two. It is an expanded view of the sheet | seat which comprises the plastic case of 2nd embodiment of this invention. It is an expanded view of the sheet | seat which comprises the plastic case of 3rd embodiment of this invention. It is an expanded view of the sheet | seat which comprises the plastic case of 4th embodiment of this invention. It is the expanded view (A) of the sheet | seat which comprises the plastic case of 5th embodiment of this invention, and the figure (B) which expanded and showed the structure of the ruled line. It is an expanded view of the sheet | seat which comprises the plastic case of other embodiment of this invention. FIG. 4 is a development view (A) of a sheet constituting a conventional plastic case, a surface view (B) in a folded state, and a cut end view (C) in a folded state. It is the cutting end view (A) of the sheet | seat folded in half of the conventional plastic case, and the cutting end view (B) of the state which received the load and curved.

Preferred embodiments of the present invention will be described with reference to the drawings.
The case of the present invention is a case that is assembled into a hexahedron formed by folding the sheet into front, back, left and right side surfaces, and upper and lower lid surfaces, and FIG. 1 shows the configuration of the sheet in which the case of the first embodiment is developed. ing.

This sheet S is formed of a rectangular plate surface, and the front part A, the rear part B, the left and right side parts C and D, and the adhesive margin part G are continuously arranged with the folding ruled lines 1, 2, 3 and 4 interposed therebetween. Upper and lower lid surface portions E and F are provided on the upper and lower edge portions of the front portion A with the ruled lines 5 and 5 interposed therebetween, and the insertion surface portions H are provided on the upper and lower edge portions of the left and right side surface portions C and D with the ruled lines 6 and 7 interposed therebetween. It is formed in a shape in which insertion pieces Ea and Fa are provided at the tips of the upper and lower lid surface portions E and F with the ruled lines 8 and 8 sandwiched therebetween.
And among the ruled lines attached between each surface part of the front part A, the back part B, the right-and-left side parts C and D, and the glue margin part G as shown in the figure, between the front part A and the side part C. The ruled line 1 and the ruled line 3 between the back surface part B and the side surface part D are not provided linearly, but are provided in a curved shape having portions shifted from the line segment X connecting the upper and lower ends of each ruled line, The ruled line 2 between the front part A and the side part D and the ruled line 4 between the back part B and the glue margin surface part G are orthogonal to the ruled lines 5, 6 and 7 between the upper and lower lid surfaces G and F and the insertion surface part H. It is provided in a straight line shape.

  Specifically, the ruled line 1 protrudes from the line segment X connecting the upper end 1a and the lower end 1b so that the entire ruled line is shifted to the right in the same figure, and is intermediate between the line segment X from the upper and lower ends 1a, 1b. The closer to the part, the larger the deviation width from the line segment X, and it is formed in a curved chevron shape where the deviation width becomes maximum at a substantially middle portion of the line segment X. Similarly to the ruled line 1, the ruled line 3 is also formed in a curved mountain shape so that the width of the deviation gradually increases toward the middle part of the line segment X with respect to the line segment X connecting the upper and lower end portions 3a and 3b. It is. Both ruled lines 1 and 3 have the same curved surface shape and are provided so as to be parallel on the developed sheet S.

The sheet S thus formed has a cylindrical shape with the ruled line 1 and the ruled line 3 as shown in FIG. 2 in a state where the glue surface G is bonded to the end of the side C and formed into a cylindrical shape. The sheet S is folded in two and is used for storage and transportation, and when the article is packaged, the two-fold sheet is three-dimensionalized and assembled into a hexahedral case.
Since the sheet S folded in half is provided in a curved shape in which both the ruled line 1 and the ruled line 3 are curved, the front part A and the side part C are twisted with each other on both sides of the ruled line 1, and the back part B on both sides of the ruled line 3. The side surface portions D are twisted to each other, and stress is applied in the direction of expanding the upper and lower surface portions around the respective ruled lines 1 and 3 to create a gap between the upper and lower surface portions. A large gap is secured between them, and when the case is assembled, if the inward force is applied to both side edges of the folded sheet S, the sheet S opens smoothly and becomes a three-dimensional case. It is possible to assemble.
Even if the lower sheet S is flattened due to the weight of the stacked sheet S group by storing a large number of folded sheets S, the sheet S is folded in half if the sheet is taken out from the storage location. In this state, the surface portions on both sides of the ruled lines 1 and 3 are twisted with each other, so that the flat sheet S is restored to the original shape due to the stress acting around the axis of the ruled lines 1 and 3, and is appropriately adjusted between the upper and lower surface portions. A gap having a width is formed, and the sheet S can be smoothly three-dimensionalized.

  FIG. 3 shows a configuration of a sheet in which the case of the second embodiment of the present invention is developed, and this form is similar to the above form in that the ruled line 1 between the front part A and the side part C, the back part B, and The ruled lines 3 between the side surfaces D are arranged in parallel on the developed sheet S, and the upper half of the ruled lines 1 and 3 is the right of the line segment X with respect to the line segment X connecting the upper and lower ends of the ruled lines. On the other hand, it is formed in a substantially S-shaped curved shape such that the lower half and the lower half are curved to the left of the line segment X.

  FIG. 4 shows the structure of a sheet in which the case of the third embodiment of the present invention is developed. This form is parallel to the sheet S in which the ruled lines 1 and 3 are developed, as in the first embodiment. The entire ruled line is shifted to the right with respect to the line segment X connecting the upper and lower ends of each ruled line, and the deviation width from the line segment X as it approaches the middle part of the line segment X from the upper and lower end parts And a curved V-shape having a maximum deviation width at a substantially middle portion of the line segment X is formed.

  FIG. 5 shows the structure of a sheet in which the case of the fourth embodiment of the present invention is developed. In this form, the ruled lines 1 and the ruled lines 3 are arranged in parallel on the developed sheet S in the same manner as the above-described forms. In addition, the entire ruled line is shifted to the right with respect to the line segment X connecting the upper and lower ends of the ruled lines 1 and 3 and gradually shifts from the upper and lower end parts toward the middle part of the line segment X. The curve lines 1 and 3 and the line segment X are formed in a curved shape that has a substantially trapezoidal outline so that the intermediate line portion X has a predetermined deviation width at a predetermined width.

  In these embodiments, for example, if the thickness of the sheet S is about 0.1 to 0.8 mm, the size of the deviation width between the line segment X and the ruled lines 1 and 3 (w in FIG. 1) is the ruled line. It is preferable that the ruled lines 1 and 3 are curved so that the maximum deviation width is in the range of 0.1 to 2.0 mm (0.1 / 100 mm to 2.0 / 100 mm) when the length of the sheet is 100 mm.

FIG. 6 shows a configuration of a sheet in which the case of the fifth embodiment of the present invention is developed, and this form is arranged in parallel on the sheet S in which the ruled line 1 and the ruled line 3 are developed, as in the above-described forms. At the same time, the ruled lines 1 and 3 are formed into a sine curve shape along the line segment X connecting the upper and lower ends thereof, and both ruled lines 1 and 3 are curved to the left and right sides of the line segment X with a predetermined width at predetermined intervals. And formed into a continuous wave shape.
In this case, the continuous waveforms of the ruled lines 1 and 3 can be set so as to project substantially the same width on both the left and right sides at a constant interval along the line segment X, as shown in FIG. preferable. For example, if the thickness of the sheet S is about 0.1 to 0.8 mm, the length Ra and Rb of one wave projecting to the left and right is 2.0 mm or more, and the length Rc of one cycle is 4.0 mm. As described above, the radius Rg of the arc at the top of the wave is 2.0 mm or more, the width Rd and Re of the left and right waves from the line segment X are in the range of about 0.1 to 1.0 mm, and the distance between the tops of the left and right waves Rf is preferably set in a range of about 0.2 to 2.0 mm.

  Even if the ruled lines 1 and 3 are provided as in the second to fifth embodiments, when the sheet S is folded in two, a large gap is formed in the center of the sheet S, and the same effect as in the first embodiment is obtained. be able to. In these embodiments, the sheet S is provided in the same outer shape. However, in the present invention, the outer shape of the sheet S is not limited to this, and the sheet S includes the front portion A, the rear portion B, and the left and right side portions. As long as C, D, and the glue margin surface portion G have a shape in which the four bent ruled lines 1, 2, 3, 4 are sandwiched, they can be provided in an appropriate outer shape as shown in FIG. 7, for example. Is possible.

The useful effects of the case of the present invention will be described based on examples and comparative examples.
Example 1
The case of the first embodiment shown in FIG. 1 was produced and the performance of the case was evaluated.
A-PET with a thickness of 0.3 mm is used, the case dimensions (W · D · L) are 30 mm × 30 mm × 100 mm, and the maximum deviation width (w in FIG. 1) with respect to the line segment X of the ruled lines 1 and 3 is 0. 10 sheets S set to 1 mm were formed. Each sample sheet S was processed into a cylindrical shape to produce ten sample cases. For the sheet S, a punching die having the above processing dimensions was prepared, and the sheet S was manufactured by a “unevenness press” hydraulic 20t press.
Each sample case is folded in two at the ruled lines 1 and 3, and a weight of 3 kg is placed on the upper surface and left for 5 days. Thereafter, the opening dimension between the upper and lower surface portions of the sheet S when the weight is removed ( Opening height) was measured with a scale loupe. In addition, an opening sensory evaluation, an appearance sensory evaluation, and a comprehensive evaluation described later were performed. In addition, the opening dimension measured the point where the clearance gap between an upper and lower surface part becomes the maximum along the direction orthogonal to the surface part located in the lower side (refer the perpendicular Max in the front part A in FIG. 2).
Further, a case with a case size of 60 mm × 30 mm × 100 mm was produced in the same manner as described above, and the same measurement and evaluation were performed.
The results are shown in Table 1. The average opening size of the 10 sample cases measured was 3.0 mm for the case of 30 mm × 30 mm × 100 mm and 5.0 mm for the case of 60 mm × 30 mm × 100 mm.

(Example 2)
Ten sample cases were produced under the same conditions as in Example 1 except that the maximum deviation width with respect to the line segment X of the ruled lines 1 and 3 was set to 0.2 mm, and the performance of the case was evaluated in the same manner as in Example 1. .
The results are shown in Table 2. The average of the measured opening dimensions of the ten sample cases was 3.4 mm for the case of 30 mm × 30 mm × 100 mm and 5.3 mm for the case of 60 mm × 30 mm × 100 mm.

(Example 3)
Ten sample cases were produced under the same conditions as in Example 1 except that the maximum deviation width for the line segment X of the ruled lines 1 and 3 was set to 0.3 mm, and the performance of the case was evaluated in the same manner as in Example 1. .
The results are shown in Table 3. The average of the measured opening dimensions of the 10 sample cases was 3.9 mm for the case of 30 mm × 30 mm × 100 mm and 6.6 mm for the case of 60 mm × 30 mm × 100 mm.

Example 4
Ten sample cases were prepared under the same conditions as in Example 1 except that the maximum deviation width with respect to the line segment X of the ruled lines 1 and 3 was set to 0.5 mm, and the performance of the case was evaluated in the same manner as in Example 1. .
The results are shown in Table 4. In addition, the average opening dimension of the ten sample cases measured was 4.1 mm for the case of 30 mm × 30 mm × 100 mm and 6.6 mm for the case of 60 mm × 30 mm × 100 mm.

(Example 5)
The case of the second embodiment shown in FIG. 3 was produced and the performance of the case was evaluated.
A sheet S using A-PET having a thickness of 0.3 mm, having a case size of 30 mm × 30 mm × 100 mm, and having a maximum deviation width of 0.3 mm with respect to the line segment X of the ruled lines 1 and 3 is the same as in Example 1. Ten sample cases were produced by forming 10 sheets by a hydraulic press and processing each sheet S into a cylindrical shape.
Also, for the case with a case size of 60 mm × 30 mm × 100 mm, ten sample cases were produced in the same manner as described above.
About each sample case, the measurement and evaluation similar to Example 1 were performed in the state folded in half by the ruled lines 1 and 3. FIG.
The results are shown in Table 5. The average opening size of the 10 sample cases measured was 4.3 mm for the case of 30 mm × 30 mm × 100 mm and 6.7 mm for the case of 60 mm × 30 mm × 100 mm.

(Example 6)
The case of the third embodiment shown in FIG. 4 was produced and the performance of the case was evaluated.
The dimensions of the produced case, the molding conditions of the sheet S, the measurement conditions of the case, and the evaluation contents are the same as in Example 5.
The results are shown in Table 6. The average of the measured opening dimensions of the ten sample cases was 3.1 mm for the case of 30 mm × 30 mm × 100 mm and 4.7 mm for the case of 60 mm × 30 mm × 100 mm.

(Example 7)
The case of the third embodiment shown in FIG. 5 was produced and the performance of the case was evaluated.
The dimensions of the produced case, the molding conditions of the sheet S, the measurement conditions of the case, and the evaluation contents are the same as in Example 5.
The results are shown in Table 7. The average of the measured opening dimensions of the 10 sample cases was 3.8 mm for the case of 30 mm × 30 mm × 100 mm and 5.2 mm for the case of 60 mm × 30 mm × 100 mm.

(Comparative example)
A case shown in FIG. 8 was prepared using a sheet S made of A-PET having a thickness of 0.3 mm.
The produced cases are of two types, 30 mm × 30 mm × 100 mm and 60 mm × 30 mm × 100 mm. Each of the sheets S is formed into 10 sheets, each sheet S is processed into a cylindrical shape, and 10 sample cases are respectively formed. Produced.
For each sample case, with the ruled lines 1 and 3 folded in half, a weight of 3 kg was placed on the top surface and left for 5 days, and then the upper and lower sides of the sheet S when the weight was removed. The opening dimension between the surface portions was measured with a scale loupe.
The results are shown in Table 8. The average of the measured opening dimensions of the ten sample cases was 2.8 mm for the case of 30 mm × 30 mm × 100 mm and 4.7 mm for the case of 60 mm × 30 mm × 100 mm.

The contents of the opening sensory evaluation, the appearance sensory evaluation, and the comprehensive evaluation of each of the examples are as follows.
(1) Opening Sensory Evaluation Compared with the case of the same size of Comparative Example 1, “O” was indicated for a wide opening size, “Δ” for a similar size, and “X” for a narrow size.
(2) Appearance sensory evaluation When the folded sheet S is assembled into a case, the case where the distortion of the case cannot be confirmed around both ruled lines 1 and 3 is ◯, the case where the distortion is slightly conspicuous, and the distortion is obvious. Each prominent item was marked with a cross.
(3) Comprehensive evaluation When assembled in a case, it can be judged that it can be shipped as a product based on the appearance of the case. Each was marked with an x.

According to the example and the comparative example, in the case of the present invention, the sheet S is not flattened in a state where the sheet S is folded in two, and a large gap is formed in the center portion thereof. Further, even if a load is applied to the upper surface of the folded sheet S and it becomes flat, the sheet S is restored to its original shape when the load disappears, and a gap with an appropriate width is secured in the central portion. .
Therefore, when assembling the sheet S into the case, the folded sheet S can be reliably and easily opened to form a three-dimensional shape, and the case of the present invention improves the boxing workability satisfactorily. This contributes to improving the efficiency in assembling the case.

S sheet, A front part, B back part, C, D side part, E, F lid surface part, G glue surface part, H insertion surface part, 1-7 folding ruled line, X-ray segment

Claims (2)

  A case in which a plastic sheet (S) having a predetermined shape is folded to be assembled into a hexahedron, and a folding ruled line (1, 2) between the front (A), back (B) and left and right side surfaces (C, D) of the case. , 3 and 4), a shape having a portion where the bent ruled line (1) between the front part (A) and the side part (C) on one side is shifted from the line segment (X) connecting the upper and lower ends of the ruled line. And a folded plastic line (3) between the back surface part (B) and the other side surface part (D) in a shape parallel to the ruled line (1). . A shape in which the bent ruled line (1) between the front part (A) and the side part (C) on one side is curved to one side or both sides of the line segment (X) connecting the upper and lower ends of the ruled line. The plastic case for packaging according to claim 1, which is provided on the packaging.

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