JP2019182467A - Carton - Google Patents

Abstract

To suppress the body bulging phenomenon of a carton with a relatively simple structure.SOLUTION: This carton has a front 100, a right side 200, a backside 300, and a left side 400 which are provided to be connected, is assembled by bending boundaries 510, 520, and 530, and has a cross-cutting line 101 formed in the front 100 in advance. A notch is formed in the backside liner 730 of a cardboard 700 at least along the boundary 510 between the front 100 and the right side 200 and the boundary 520 between the front 100 and the left side 400.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a corrugated cardboard box that can suppress a swelling phenomenon caused by a load.

When a large loading load (arrow C in FIG. 6) acts on the cardboard box, the left and right side portions may bulge so as to bend in the height direction, and a so-called body bulge having a barrel-like appearance may occur (see FIG. 6).
In particular, a so-called shelf-ready package (SRP) type cardboard box in which a part of the front portion can be cut to show the contents, the front portion 900 is formed with perforations for cutting. Since the longitudinal cutting line 950 is previously formed in the horizontal cutting line 920 or the boundary part 940 between the front part 900 and the side part 910, the body swelling phenomenon is likely to occur.
As a corrugated cardboard box which prevents such a swelling phenomenon, there is one disclosed in Japanese Patent Application Laid-Open No. 2017-013856.

  Such a corrugated cardboard box is “in a corrugated cardboard box in which a side wall and a bottom wall are connected in series and a boundary portion thereof is folded and assembled, and at the boundary portion between the side wall and the bottom wall, a single axis folding ruled line serving as a folding axis is formed. In contrast, two auxiliary crease lines shifted in the direction of the side wall and the bottom wall are alternately inserted, and a buckling guide line parallel to the axial crease line is intermittently formed with respect to the axial crease line. It was put above the auxiliary crease line ”.

JP 2017-013856 A

However, the device described in Japanese Patent Application Laid-Open No. 2017-013856 needs to form three cuts: “one axis crease line”, “two auxiliary crease lines”, and “buckling guide line”. In addition, the auxiliary crease line must be formed alternately with the axial crease line, and the buckling induction line must be formed intermittently with respect to the axial crease line and above the auxiliary crease line.
Such constraints reduce the degree of freedom in designing and producing cardboard boxes.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a corrugated cardboard box which is free from the above-described restrictions and which has a relatively simple structure and prevents a swelling phenomenon.

  The cardboard box according to the present invention is a cardboard box in which a front part, a right side part, a back part and a left side part are connected in series and are assembled by bending the boundary part of each part, at least a boundary part between the front part and the right side part The weak part is formed along the boundary part between the front part and the left side part.

  Another corrugated cardboard box according to the present invention includes a front part, a right side part, a rear part, and a left side part, which are assembled by bending a boundary part of each part, and a horizontal cutting line is previously formed on the front part. It is a box, Comprising: The weak part is formed along the boundary part between a front part and a right side part, and the boundary part between a front part and a left side part at least.

  The fragile portion is formed by cutting only the liner on the back side of the cardboard.

  The weak part has a straight part that is straight in the up-and-down direction and a bent part that is bent from the upper end of the straight part toward the boundary part. Or the said weak part has a straight straight part in the up-down direction, and the bending part bent toward the boundary part from the up-and-down both ends of this linear part.

  The bent portion of the fragile portion has an angle of 45 ° with respect to the corner portion of the boundary portion.

  The fragile portion is formed in a range of 20 mm to 40 mm from the boundary portion.

  Since the corrugated cardboard box according to the present invention is formed with a fragile portion, the fragile portion prevents the bent line of the corrugated cardboard from being caused by a load causing the swelling phenomenon from the upper and lower four corners (boundary portion) toward the middle of the trunk portion. Since it is attracted in the vertical direction, it is possible to suppress the swelling phenomenon.

  Further, even if the fragile portion of the cardboard box according to the present invention is of a type in which the cutting line is not formed in the front portion in advance, the fragile portion causes the bending line of the corrugated cardboard that causes the swollen phenomenon in the vertical direction Since it is attracted, it is possible to suppress the swelling of the trunk.

  Further, the weakened portion is formed by cutting only the liner on the back side of the cardboard and is not visible from the outside, so that the appearance of the cardboard box is not impaired. Further, since the fragile portion appears only inside the cardboard box, it does not become an obstruction factor when printing or the like is performed on the cardboard box.

It is a schematic development view of the back surface side (surface which becomes an inner side when assembled) of the cardboard box concerning an embodiment of the invention. It is a schematic plan view of the weak part of the cardboard box concerning an embodiment of the invention. It is a schematic plan view of the weak part of the cardboard box concerning other embodiments of the present invention. It is a schematic perspective view which shows the internal structure of the cardboard used for the cardboard box which concerns on embodiment of this invention. It is a schematic perspective view which shows the state which the cardboard box which concerns on embodiment of this invention suppressed the swelling phenomenon. It is a schematic perspective view which shows the swelling phenomenon which generate | occur | produces in the conventional cardboard box.

A corrugated cardboard box 1000 according to an embodiment of the present invention includes a front part 100, a right side part 200, a back part 300, and a left side part 400, which are assembled by bending the boundary parts 510, 520, and 530 of each part. 100 is a cardboard box in which a transverse cutting line 101 is formed in advance, and at least along a boundary portion 510 between the front portion 100 and the right side portion 200 and a boundary portion 520 between the front portion 100 and the left side portion 400. A fragile portion 600 is formed.
As shown in FIG. 4, the corrugated cardboard box 1000 includes a center core 710 and a so-called double-sided cardboard 700 in which liners 720 and 730 are bonded to both front and back surfaces of the center core 710.

As shown in FIG. 1, the corrugated cardboard box 1000 has a back surface portion 300, a left side surface portion 400, a front surface portion 100, and a right side surface portion 200 connected in series from the left side.
Further, a joint allowance 330 is extended to the left end edge of the back surface portion 300. The joint allowance 330 is a portion that is bonded to the right end portion of the right side surface portion 220 when the cardboard box 1000 is assembled.

A front upper outer flap 110 extends from the upper end edge of the front portion 100, and a front lower outer flap 120 extends from the lower end edge.
Similarly, a rear upper outer flap 310 extends from the upper end edge of the rear portion 300, and a rear lower outer flap 320 extends from the lower end edge.

Furthermore, an upper right side inner flap 210 extends from the upper end edge of the right side surface portion 200, and a lower right side inner flap 220 extends from the lower end edge.
Similarly, a left upper inner flap 410 extends from the upper edge of the left side surface 400, and a lower left inner flap 420 extends from the lower edge.

The front upper outer flap 110, the front lower outer flap 120, the rear upper outer flap 310, and the rear lower outer flap 320 have a rectangular shape having a lateral width equal to the lateral width of the front portion 100 and the rear portion 300. .
Further, the upper right side inner flap 210 and the upper left side inner flap 410 have a rectangular shape having a lateral width dimension equal to the width dimension of the right side surface part 200 and the left side surface part 400.

  On the other hand, the upper right inner flap 210 and the upper left inner flap 410 are not rectangular but have a substantially L-shape because a notch is formed toward the front upper outer flap 110. The upper right inner flap 210 and the upper left inner flap 410 are substantially L-shaped, but when the substantially upper half of the front part 100 and the substantially front half of the front upper flap 110 following the front part 100 are cut off, the cardboard box This is because the upper surface of the contents (for example, bag-like confectionery) stored in 1000 can be seen from the outside.

The front section 100 is formed with a horizontal cutting line 101 made of perforations along the horizontal direction. This horizontal cutting line 101 is formed by perforations.
In addition, vertical cutting lines 102 and 103 are also formed at both ends of the horizontal cutting line 101, that is, from the boundary portions 510 and 520 between the right side surface portion 200 and the left side surface portion 400 upward. The vertical cutting lines 102 and 103 are formed by zipper lines.
The transverse cutting line 101 is a care unit 101A that is convex downward at substantially the center. The portion that becomes the care portion 101A is a portion that is handed when the transverse cutting line 101 of the front portion 100 is cut. Ruled lines are formed in advance between the left and right ends of the care section 101A so as to be easily bent.

Four weak parts 600 are provided on the back side of the front part 100 configured in this way. As shown in FIG. 2, the fragile portion 600 is formed by integrating a straight portion 610 that is straight in the vertical direction and a bent portion 620 that is continuous from both the upper and lower ends of the straight portion 610.
There are a total of four such weak parts 600 along the boundary part 510 between the front part 100 and the right side part 200 and two along the boundary part 520 between the front part 100 and the left side part 400. ing.

In addition, in the fragile portion 600, the bent portions 620 at the upper and lower ends are bent at an angle of 45 ° toward the corner portions of the boundary portions 510 and 520. Moreover, the straight portion 610 is formed in the range of 20 mm to 40 mm from the boundary portions 510 and 520. If the fragile portion 600 is formed out of the above range, the effect of suppressing the swollen phenomenon is weakened. This range is not related to the size of the cardboard box 1000. Further, the bent portion 620 of the fragile portion 600 is formed at an angle of 45 ° toward the corner portions of the boundary portions 510 and 520, most effectively suppressing the body swelling phenomenon.
In addition, this weak part 600 is comprised by notching only the liner 730 of the back surface side of the double-sided cardboard 700. FIG.

The front upper outer flap 110 is also formed with an upper cut line 111 made of a perforation. The upper cutting line 111 is formed from the left and right upper corners of the front portion 100, that is, from the upper ends of the left and right boundary portions 510 and 520 toward the center of the front upper outer flap 110. Accordingly, two upper cut lines 111 are formed.
In addition, a laterally long ellipsoidal care portion 111A is formed in the approximate center of the front upper outer flap 110. Since the care portion 111A is a portion to be handed when the upper cutting line 111 is cut, the lower corner is connected to the upper end of the upper cutting line 111.

Also, four weak parts 600 are provided on the back side of the back part 300 of the cardboard box 1000. The four weak portions 600 of the back surface portion 300 are provided in total, two along the boundary portion 530 between the back surface portion 300 and the left side surface portion 400 and two along the seam 330.
The two weakened portions 600 provided along the joint allowance 330 are provided along the end portion of the right side surface portion 200 in the assembled cardboard box 1000.
Therefore, the four weak parts 600 of the back part 300 are provided in the assembled cardboard box 1000 in the same manner as the front part 100.

The cardboard box 1000 is assembled in the following procedure.
First, the boundary portions 510, 520, and 530 are bent. At this time, the side on which the fragile portion 600 is provided is set to the inside.
Next, the joint 330 of the back surface portion 300 is bonded to the back surface side of the right surface portion 200.
The lower right inner flap 220 and the lower left inner flap 420 are respectively bent inward, and then the front lower outer flap 120 and the back lower outer flap 320 are respectively bent inward, and the front lower side by an appropriate means such as an adhesive tape. The outer flap 120 and the back lower outer flap 320 are attached. As a result, the bottom surface of the cardboard box 1000 is closed.

  In the present specification, a joint portion between the right side surface portion 200 and the back surface portion 300 is referred to as a boundary portion 540 (see FIG. 5).

The contents are stored in a cardboard box 1000 whose bottom surface is closed.
Next, the upper right inner flap 210 and the upper left inner flap 410 are each folded inward, and then the front upper outer flap 110 and the rear upper outer flap 310 are folded inward, respectively, and the front upper outer flap is secured by appropriate means such as an adhesive tape. The flap 110 and the back upper outer flap 310 are attached. As a result, the upper surface of the cardboard box 1000 is closed.

When the cardboard boxes 1000 in this state are stacked, the boundary portion 510 between the front portion 100 and the right side portion 200 of the cardboard box 1000, the boundary portion 520 between the front portion 100 and the left side portion 400, and the left side portion 400. A vertical force (for example, an increased load, arrow A shown in FIG. 5) is applied to the boundary portion 530 between the rear surface portion 300 and the boundary portion 540 between the rear surface portion 300 and the right side surface portion 200. It is done.
This force is a force that induces a trunk swelling phenomenon, and causes a bend line that induces a bend.
In particular, since the longitudinal cutting lines 102 and 103 are formed at the boundary portions 510 and 520, the force is directly applied to the vertical cutting lines 102 and 103 without the weakened portion 600, so that a swollen phenomenon occurs. Cheap.

However, since the weak part 600 is provided on the back side of the front part 100 and the back side of the back part 400, the force that induces the swelling phenomenon is attracted in the vertical direction along the weak part 600 (see FIG. 5). As a result, the boundary portions 510, 520, 530, and 540 can share more load.
Since the force that induces the swelling phenomenon is present in the fragile portion 600, the vertical cutting line 102, as indicated by the arrow B shown in FIG. 5, is not directly applied to the vertical cutting lines 102 and 103 of the boundary portions 510 and 520. Since it acts on a position away from 103 (the portion where the fragile portion 600 exists), the front portion 100 slightly swells toward the front side, but the conventional swelling phenomenon does not occur.

In the above-described embodiment, the fragile portion 600 is formed integrally with the straight portion 610 that is straight in the vertical direction and the bent portion 620 that is continuous from both the upper and lower ends of the straight portion 610. However, as shown in FIG. 3, there is also a fragile portion 650 in which the bent portion 670 is formed only above the straight portion 660.
The weakened portion 650 in which the bent portion 670 is formed only on the upper side of the straight portion 660 corresponds to the sample B in Experiments 1 and 2 below.

In the corrugated cardboard box 1000 having the fragile portions 600 and 650 as described above, it was confirmed by the following experiment that the body swelling phenomenon does not occur.
First, a target cardboard box 1000 is composed of a double-sided ball 700 which is a so-called A flute in which an inner core 710 uses MC120, a front-side liner 720, and a back-side liner 730 using LC160.
As the A flute, a core 710 having 34 ± 2 steps per 30 cm and a step height of about 5 mm is used.

This double-faced cardboard 700 is a JIS0201 type cardboard box 1000 in which the front upper outer flap 110 and the back upper outer flap 310 are butted and the front lower outer flap 120 and the back lower outer flap 320 are butted. .
The cardboard box 1000 has a vertical dimension of 255 mm, a horizontal dimension of 465 mm, and a height dimension of 220 mm.

Experiment 1 was performed on five samples A to E shown in Table 1 each.
Experiment 2 was performed on each of the five types of samples A to E shown in Table 1.

Experiment 1 (compression test)
Experimental conditions M.M. Corrugated cardboard container compression tester TMC-PC50 manufactured by C Co., Ltd. Measured with JIC Z 0212 Pretreatment: Samples are stored for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50%. A load is applied from above the samples A to E at a constant speed (10 mm / min), and the compressive strength and strain are measured. The compressive strength results of Experiment 1 are shown in Table 2, and the strain results are shown in Table 3, respectively.

  In Table 2, the average value of sample A was set as 100 and compared with samples B and C, and the average value of sample D was set as 100 and compared with sample E.

  In Table 3, the average value of sample A was set as 100 and compared with samples B and C, and the average value of sample D was set as 100 and compared with sample E.

Comparing Sample A and Sample B from the results of Experiment 1, the effect was seen in Sample B in the compressive strength test, but the effect was not so much seen in the strain amount test.
Further, when the sample A and the sample C are compared with each other from the result of the experiment 1, it is confirmed that the compressive strength of the sample C is improved by 5.5% and the distortion amount is reduced by 10.9%. It has been found that it is effective in suppressing the swelling phenomenon.

  Furthermore, from the results of Experiment 1, it is confirmed that the compressive strength is improved by 1.1% and the distortion amount is reduced by 16.7%, compared with Sample D and Sample E, and the weakened portion 600 is caused by the swelling phenomenon It turned out to be effective.

  That is, from Experiment 1, it was confirmed that the swelling of the body can be suppressed by forming the fragile portion 600 regardless of the presence or absence of the horizontal cutting line 101, the vertical cutting lines 102 and 103, and the upper cutting line 111.

Experiment 2 (creep test)
Experimental conditions M.M. Corrugated cardboard container compression tester TMC-PC50 manufactured by C Co., Ltd. Measured with JIC Z 0212 Pretreatment: Samples are stored for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50%. (Only one creep is necessary because the measured value is stable)
A load of 2000 N was applied from above each sample for 24 hours, and the amount of strain was measured. The results of the creep test in Experiment 2 are shown in Table 4.

In Table 4, sample A was set as 100 and compared with sample C, and sample D was set as 100 and compared with sample E.
In Experiment 1, Experiment 2 was not performed on Sample B, which was judged to have a low effect of suppressing the swelling of the body.

From the results of Experiment 2, when comparing sample A and sample C, it was confirmed that the amount of strain was reduced by 0.9 mm and 13.8%, and it was found that the fragile portion 600 was effective in suppressing the swollen phenomenon. did. Moreover, comparing the sample D and the sample E from the result of the experiment 2, it is confirmed that the strain amount is reduced by 0.9 mm and 13.8%, and the fragile portion 600 is effective in suppressing the body swelling phenomenon. There was found.
That is, from Experiment 2, it was confirmed that the swelling of the body can be suppressed by forming the fragile portion 600 regardless of the presence or absence of the horizontal cutting line 101, the vertical cutting lines 102 and 103, and the upper cutting line 111.

  The corrugated cardboard box according to the present invention includes the horizontal line break 101, the care sections 101A and 111A, the vertical cut lines 102 and 103, the upper right inner flap 210, and the upper left inner flap 410 of the cardboard box 1000 according to the above-described embodiment. Needless to say, it is not limited to the shape or the like, and may be another shape.

In the above-described embodiment, the fragile portion 600 is formed on the back side of the cardboard box 1000. That is, the weakened portion 600 is formed by cutting only the liner 730 on the back side of the cardboard 700 constituting the cardboard box 1000. However, it is also possible to make a cut by making a cut in the liner 720 on the surface side of the cardboard 700.
If the fragile portion 600 is formed by making a cut only in the liner 730 on the back side, the appearance of the cardboard box will not be impaired and it will not be a hindrance to printing or the like. If 600 is comprised, there exists a merit that it can appeal visually also that it is a cardboard box which aimed at suppression of a swelling phenomenon.
In the above-described embodiment, four weak parts 600 are provided, but in the case of a short cardboard box, one may be provided on each of the left and right.

DESCRIPTION OF SYMBOLS 100 Front part 101 Horizontal cutting line 200 Right side part 300 Back part 400 Left side part 600 Fragile part

The weak part has a straight part that is straight in the vertical direction and a bent part that is bent from the upper end of the straight part toward the boundary part. Or the said weak part has a straight part straight in the up-down direction, and the bending part bent toward the boundary part from the up-and-down both ends of this straight part.

Claims (7)

  In the corrugated cardboard box assembled by bending the boundary part of each part, the front part, the right side part, the back part and the left side part are connected in series, at least the boundary part between the front part and the right side part, the front part and the left side part A corrugated cardboard box characterized in that a fragile portion is formed along a boundary portion between them.   In a corrugated cardboard box in which a front part, a right side part, a rear part and a left side part are connected in series, a boundary part of each part is folded and assembled, and a transverse cutting line is formed in advance in the front part, at least between the front part and the right side part A corrugated cardboard box, wherein a fragile portion is formed along a boundary portion between the front portion and the left side portion.   The cardboard box according to claim 1 or 2, wherein the fragile portion is formed by cutting only the liner on the back side of the cardboard.   The corrugated board according to claim 1, 2 or 3, wherein the fragile portion includes a straight portion that is straight in an up-and-down direction and a bent portion that is bent from an upper end of the straight portion toward a boundary portion. box.   The said weak part has a straight straight part in an up-down direction, and the bending part bent toward the boundary part from the up-and-down both ends of this straight part, The Claim 1, 2 or 3 characterized by the above-mentioned. Cardboard box.   6. The cardboard box according to claim 4, wherein the bent portion of the fragile portion has an angle of 45 degrees with respect to a corner portion of the boundary portion.   The cardboard box according to claim 1, 2, 3, 4, 5 or 6, wherein the fragile portion is formed in a range of 20 mm to 40 mm from the boundary portion.

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