JP2015129001A - Carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carton in which carton strength can be maintained at a constant value or larger, even if the height of the carton is a low shape, and the opening property is good.SOLUTION: An opening auxiliary part 32 is defined on a mask connected through a folding end edge 7A with respect to an inside end panel 7 of the carton. In the folding end edge 7A, a cutting/opening cut line 71 is formed from both ends of the opening auxiliary part 32 to the way toward side edges 7C and 7D. In the inside end panel 7, an opening part 73 is defined by guiding cut lines 72A and 72B and the cutting/opening cut line 71 plurally formed at the side of the side edges 7C and 7D. The inside end panel 7 is bonded with an outside end panel 6 by an adhesive part 74 formed in the opening part 73. The guiding cut lines 72A and 72B are arranged substantially in parallel with the cutting/opening cut line 71, and positioned so as to come close to the side of the side edges 7C and 7D as going to the side of an opposed end edge 7B. The cutting/opening cut line 71 and the guiding cut lines 72A and 72B have the overlapping with each adjacent cut line.

Description

  The present invention relates to a carton having a wife surface as an opening start position.

2. Description of the Related Art Conventionally, as an outer box containing contents such as retort food and various packages, a carton having a structure in which the contents are opened by taking out the contents from the wife surface is known (see, for example, Patent Documents 1 and 2).
In such a carton, when the carton is opened, a part of the bottom surface is broken by pushing in a pushing portion formed of a substantially arc-shaped cut formed on the bottom surface starting from the folding line between the bottom surface and the wife surface. After that, the inner and outer end plates that constitute the end surface are opened, and the contents are taken out.

In the carton having the above configuration, when the carton height is set to a high shape, the height of the inner side plate and the outer side plate is made shorter than the height of the carton. In such a configuration, when the inner end plate and the outer end plate are folded, all of the inner end plate and the outer end plate do not overlap, and only a part thereof overlaps. In this case, an adhesive portion is provided in a region where the inner side plate and the outer side plate overlap each other, and a cut line is provided in a region where they do not overlap each other.
In this way, by making the installation position of the adhesive part and the cut line different from each other, when opening along the cut line, there is no adhesive part in the middle of the cut line, so a carton with good openability is provided it can.

On the other hand, when the carton height is set to a low shape, in order to avoid the formation of a cut line in the region where the bonding portion for bonding the inner side plate and the outer side plate is formed, the bent edge is formed. Generally, a method is used in which a cut line is provided on the top, or a cut line is formed only in a substantially arc-shaped pushing portion where a finger is put.
When a cut line is provided on the bent edge, the strength of the carton needs to be maintained at a certain level or more, so that a large cut for forming the cut line cannot be made. For this reason, even if a predetermined stress is applied at the time of opening, not all of the cut line can be broken along the cut line on the bent edge, and the face side in the direction in which the stress is applied in the middle of the cut line This causes a problem that the unsealed surface looks worse.
For example, if a notch is formed to form a cut line for easy opening, the bent edge tends to become brittle, and the cut line on the bent edge breaks during storage or transportation of the carton. This causes a malfunction.
In addition, when a cut line is made only in the indented part, after breaking along the cut line of the indented part, the wife side is torn in the direction in which stress is applied from the broken end part, and satisfactory opening is performed. The trouble that cannot be done.

JP 2003-231518 A JP 2009-179328 A

In addition, a configuration in which a cut line extending from both ends to both side edges is also known in the vicinity of the bent edge of the surface located at the bottom of the body.
In the configuration in which the cut line is installed on the body, even if the carton has a low shape, the cut line is not formed in the region where the bonded part for bonding the inner face plate and the outer face plate is formed. It is possible to avoid the deterioration of the openability due to the overlap of the cut line. In addition, since there is no cut line on the bent edge, even if the carton is being stored or transported, it will not break from the cut line, so the strength of the carton can be maintained above a certain level. it can.
However, since the cut line is provided on the surface constituting the body, the opening is widely formed, so that the appearance of the opening surface is deteriorated.

  An object of the present invention is to provide a carton that can maintain a carton strength at a certain level or more and that has a good opening property even if the carton has a low height.

The present invention has the following configuration.
(1) A carton in which both ends on the opening side of the body formed in a cylindrical shape are closed by folding an inner end plate and an outer end plate connected to both ends via bent end edges, the inner end plate The body is formed in a quadrilateral shape having the bent end edge, the opposite end edge facing the bent end edge, and two side end edges connecting the end portions of the bent end edge and the opposite end edge. The surface connected to the inner end plate via the bent end edge is provided with an opening assisting portion connecting two spaced points on the bent end edge, and the bent end edge includes Incision cut lines extending from both ends of the opening assisting portion toward the two side end edges are formed, respectively, and the inner end plate has a predetermined length extending toward the two side end edges. A cut line is formed, and the guide cut line and the incision cut line An opening portion integral with the opening assisting portion is partitioned, and the inner end plate and the outer end plate are bonded by an adhesive portion formed on the opening portion, and the cut line for incision is formed from both ends of the opening assisting portion. Each of the guide cut lines is formed on the side end edge side, and the plurality of guide cut lines are substantially parallel to the incision cut line. The incision is arranged from the bent edge to the opposite edge side with a certain distance from each other, and located closer to the side edge side from the bent edge toward the opposite edge. The carton line and the plurality of guide cut lines have an overlap with each adjacent cut line in the direction from the bent edge to the opposing edge.

(2) In the carton according to (1), the incision cut line is constituted by a plurality of incision cuts, and at least one of the plurality of incision cuts on the opening assisting portion side. The distal end is on the opposite edge side, bent in the direction of the opening assisting portion, and the distal end on the side edge side of the cutting incision arranged on the most side edge side among the plurality of incision cuts, A leading edge on the side edge side of the at least one guide cut line among the plurality of guide cut lines, which is on the opposite edge side, and is bent in the direction of the side edge. A carton bent in the direction of the side edge.

(3) In the carton described in (1) above, the leading end of the guide cut line on the side of the opening assisting portion is on the bent edge side and is bent in the direction of the opening assisting portion. And carton.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a shape where the height of a carton is low, carton strength can be maintained more than fixed, and a carton with favorable openability can be provided.

It is an expanded view of the blank board which forms the carton concerning one Embodiment of this invention. It is the elements on larger scale which show a bottom board and an inner side board. It is the elements on larger scale which show the bottom face board and inner side board of FIG. 2, (A) is a figure which shows the relationship of the angle of the front-end | tip of a cut line, (B) is a figure which shows the relationship of the space | interval of a cut line. It is a perspective view which shows the state which wraps the said carton. It is a perspective view which shows the said carton, (A) shows the state before opening, (B) shows the state after opening. It is the elements on larger scale which show the bottom board and inner side board of a carton in other embodiment. It is the elements on larger scale which show the bottom face board and inner side face board of a carton in the comparative example 1. FIG. It is the elements on larger scale which show the bottom face board and inner side face board of a carton in the comparative example 2. It is the elements on larger scale which show the bottom face board and inner side face board of a carton in the comparative example 3.

  The carton of the present invention is a carton in which both ends on the opening side of the body formed in a cylindrical shape are closed by folding an inner end plate and an outer end plate connected to the both ends via bent end edges, The inner end plate is formed in a quadrangular shape having the bent end edge, an opposite end edge facing the bent end edge, and two side end edges connecting the end portions of the bent end edge and the opposite end edge. An opening assisting portion connecting two spaced points on the bent end edge is defined on a surface of the body that is connected to the inner end plate via the bent end edge, and the bent end Cut edges for incision extending from both ends of the opening assisting portion toward the two side end edges are formed on the edges, respectively, and the inner end plate has a predetermined length extending toward the two side end edges. And a guide cut line and the incision line are formed. An opening part integral with the opening assisting part is defined by a tear line, and the inner end plate and the outer end face plate are bonded by an adhesive part formed on the opening part, and the cut line for incision is formed of the opening assisting part. Each of the guide cut lines is formed on each side edge side, and the plurality of guide cut lines are formed with the incision cut lines. Substantially parallel, spaced from each other and arranged from the bent edge to the opposite edge side, and positioned closer to the side edge side from the bent edge toward the opposite edge. The incision cut line and the plurality of guide cut lines have an overlap with adjacent cut lines in the direction from the bent edge to the opposed edge.

According to the present invention as described above, the bonding portion for bonding the inner face plate and the outer face plate is formed at the opening portion defined by the guide cut line and the incision cut line. Thus, since the guide cut line and the incision cut line are not formed in the region where the bonding part is formed, the deterioration of the unsealing property due to the overlapping of the bonding part and the cutting line is avoided.
Incision cut lines are respectively formed on the bent end edge from the both ends of the opening assisting part to the middle of the two side end edges. For this reason, the strength of the folding edge is maintained as compared with the case where the incision cut line is formed from both ends of the opening assisting portion to the side edge on the folding edge, so the strength of the carton is increased. It can be maintained above a certain level. As a result, even when the carton is stored or transported, the occurrence of breakage from the incision line formed at the bent edge is reduced.
Further, a plurality of guide cut lines are formed on each side edge side. By forming the plurality of guide cut lines on the side edge side, it is possible to enlarge the area of the opening portion defined by the guide cut line and the incision cut line. Therefore, since the area of the bonding portion formed in the opening portion can be increased, the inner face plate and the outer face plate can be bonded more firmly. In addition, since the area of the bonded portion can be increased, it is possible to use an adhesive application device that forms a linear bonded portion that is generally used. It is not necessary to newly introduce a special adhesive application device that forms the adhesive portion.
Further, the plurality of guide cut lines are substantially parallel to the incision cut line, arranged at a predetermined interval from the bent end edge to the opposite end side, and from the bent end edge toward the opposite end edge. Accordingly, the incision cut line and the plurality of guide cut lines are overlapped with the adjacent cut lines in the direction from the bent edge to the opposite edge. For this reason, at the time of opening, first, the cut line for incision is broken from the both ends of the opening assisting part to the middle toward both side edges. Next, from both ends of the broken incision cut line, the incision cut line and the guide cut line adjacent to the incision cut line are broken in a direction in which stress is applied. A guide cut line adjacent to the cut line is reached. Next, the guide cut line adjacent to the incision cut line is broken from the reached broken part to the end part on the side edge side. Subsequently, from the end portion of the broken guide cut line, the guide cut line and the guide cut line adjacent to the opposite edge side of the guide cut line are broken in a direction in which stress is applied, The broken portion reaches the guide cut line adjacent to the incision cut line. Then, the plurality of guide cut lines are broken in the same manner as the guide cut lines, and the break reaches the side edge. In this way, since the rupture is sequentially performed along each cut line, even if the carton has a low height, good openability can be obtained.

  In the present invention, the incision cut line is constituted by a plurality of incision cuts, and the tip of the opening assisting part side of at least one of the plurality of incision cuts is on the opposite edge side And the tip of the side edge side of the incision cut arranged on the most side edge side among the plurality of incision cuts is bent in the direction of the opening assisting part, is the opposite edge side, Bending in the direction of the side edge, the tip on the side edge side of at least one guide cut line among the plurality of guide cut lines is on the opposite edge side, and the direction of the side edge Are preferably bent.

According to such a configuration, the tip of the opening assistance part side of at least one of the incision cuts is on the opposite edge side and is bent in the direction of the opening assistance part.
For this reason, at the time of opening, after the ruptured portion reaches the end of the side edge of the incision cut adjacent to the incision cut having a bend on the opening assisting portion side, from the end of the broken incision cut Fracture in the direction of stress. Then, when the broken part reaches the bending of the tip of the opening assisting part side adjacent to the side edge of the broken incision, the direction of the breaking is guided to the incision having a bend. Is done. Thereby, the cut line for incision is favorably broken between the cuts from the opening assisting part side to the side edge side.
Further, among the plurality of incisions, the tip on the side edge side of the incision cut arranged on the side edge side is the opposite edge side and is bent in the direction of the side edge. For this reason, at the time of opening, after the broken portion reaches the end portion on the side edge side of the incision cut arranged on the most side edge side, the direction of the break is directed toward the bending direction provided at the tip Be guided. And a fracture | rupture part reaches | attains even to the cutting | disconnection line for a guide arrange | positioned at the front-end | tip edge side in the direction of a bending. Thereby, the breakage from the incision cut line to the guide cut line is performed smoothly.
Furthermore, the tip on the side end edge side of at least one guide cut line among the plurality of guide cut lines is on the opposite end side and is bent in the direction of the side edge. For this reason, at the time of opening, after the broken portion reaches the end portion on the side edge side of the guide cut line having a bend at the end on the side edge side, the direction of the break is directed toward the bending direction provided on the tip. Be guided. And a fracture | rupture part reaches | attains even to the cutting | disconnection line for a guide arrange | positioned at the front-end | tip edge side in the direction of a bending. As a result, the break from the guide cut line having a bend at the tip on the side edge side to the guide cut line adjacent to the guide cut line on the opposite edge side is smoothly performed.

  Moreover, in this invention, it is preferable that the front end by the side of the opening assistance part of the said guide cut line is the said bending edge side, and is bent in the direction of the said opening assistance part.

According to such a configuration, the leading end of the guide break line on the side of the opening assisting portion is the bent end edge side and is bent in the direction of the opening assisting portion.
When the guide cut line having the above-mentioned bend at the tip is adjacent to the incision cut line, at the time of opening, the broken part reaches the end on the side edge side of the incision cut, and then the cut incision line is broken. Fracture from the end in the stressed direction. Then, the direction of the breakage is guided to the bending of the leading end of the guide cut line having a low strength. Thereby, the breakage from the incision cut line to the guide cut line is performed smoothly.
Further, when the guide break line having the above-mentioned bend at the tip is not adjacent to the cut line for incision, at the time of opening, the broken part reaches the end on the side edge side of the guide cut line and then is broken. It breaks in the direction where stress is applied from the end of the guide line. Then, the direction of the breakage is guided to the bending of the leading end of the guide cut line adjacent to the broken guide cut line, which is weak in strength, on the opposite edge side. Thereby, the break from the guide cut line on the bent end side to the guide cut line adjacent to the guide cut line on the opposite end side is smoothly performed.

  Hereinafter, an embodiment according to a carton of the present invention will be described with reference to the drawings. In the present embodiment, a carton for packaging an object to be packaged such as retort food will be described. The carton is opened by forming a cut line on the end plate sealing both ends of the body formed in a cylindrical shape such as a quadrangular prism, and cutting along the cut line.

[Composition of carton]
FIG. 1 is a development view of a blank plate forming a carton according to an embodiment of the present invention.
As shown in FIG. 1, the blank plate 10 </ b> A is made of a material whose main material is paper, and an appropriate material is selected according to the type of the object to be packaged. Specific examples include white paperboards such as Manila balls and coated balls, oilproof papers obtained by subjecting these whiteboard papers to oil resistance, combinations of these papers and aluminum foil, and synthetic papers.
In the blank plate 10A, a top plate 1, a side plate 2, a bottom plate 3, and a lower overlap side plate 4 each having a rectangular shape are provided in this order via folding lines. Further, a rectangular upper side plate 5 is provided on the opposite side of the top plate 1 from the side plate 2 via a folding line.

On the pair of short sides of the top plate 1, outer end plates 6 are respectively provided via folding lines.
On the pair of short sides of the bottom plate 3, inner end plates 7 are respectively provided via folding lines.
Side flaps 8 are respectively provided on the pair of short sides of the side plate 2 via folding lines.
Side flaps 9 are respectively provided on the pair of short sides of the upper overlap side plate 5 via folding lines.

The inner end plate 7 has a quadrangular shape, specifically a trapezoidal outer shape, by four edges. Here, the bent portion serving as the boundary with the bottom plate 3 is the bent end edge 7A, the end edge facing the bent end edge 7A is the opposite end edge 7B, and the end portion between the bent end edge 7A and the opposite end edge 7B. End edges that connect each other are referred to as side end edges 7C and 7D. In the trapezoidal inner end plate 7, the bent edge 7A is slightly longer than the opposed edge 7B.
The outer face plate 6 has an outer shape substantially the same shape as the inner face plate 7.

Next, the configuration of each cut line will be described with reference to FIG.
FIG. 2 is a partially enlarged view showing the bottom plate 3 and the inner end plate 7.
In addition, although each cut line located in the side edge 7C side is demonstrated, in FIG. 2, each cut line is provided symmetrically in the center of the longitudinal direction (the up-down direction in the figure) of the inner side plate 7 as a boundary. Therefore, each cut line located on the side edge 7D side has the same configuration.

[Cutting line for pressing]
The bottom plate 3 is formed with a cut line 31 for press-cutting that connects two spaced points P1 and P2 on the bent edge 7A. The cut line 31 for the press cut is substantially arc-shaped, and is formed such that two spaced points P1 and P2 on the bent edge 7A are positioned at both ends of the cut cut line 31. Note that the two separated points P1 and P2 that are both ends of the cut line 31 for the cut-off line are provided so that the center of the imaginary line connecting the two points P1 and P2 is located at the substantially central portion of the bent edge 7A. ing. The distance between the two separated points P1 and P2 is the width of the thumb or slightly larger than that. The opening assisting portion 32 adjacent to the inner side end plate 7 is defined by the cut line 31 for pressing and the bent edge 7A.

[Incision line]
An incision cut line 71 extending from the point P1, which is the end of the press cut cut line 31, toward the side edge 7C is formed on the bent end edge 7A. The incision cut line 71 is formed from the point P1, which is an end of the press cut line 31, that is, from the end of the opening assisting part 32 to the middle of the side edge 7C.
In the present embodiment, the incision cut line 71 includes three incision cut lines 71A, 71B, and 71C. Of the three incision cuts 71A, 71B, 71C, the tip 71B1, on the opening assisting portion 32 side of the cut incisions 71B, 71C that is not adjacent to the point P1 that is the end of the pressing cut line 31. 71C1 is on the opposite edge 7B side, and is bent in the direction of the opening assisting portion 32.
Of the three incision cuts 71A, 71B, 71C, the distal end 71C2 on the side edge 7C side of the incision cut 71C arranged closest to the side edge 7C is on the opposite end edge 7B side, It is bent in the direction of the edge 7C.

[Guide line for guidance]
A guide cut line 72 having a predetermined length extending toward the side end edge 7 </ b> C is formed on the inner end plate 7. The guide cut line 72 and the incision cut line 71 define an opening part 73 integral with the opening assisting part 32.
A substantially linear bonding portion 74 is formed at a substantially central portion of the opening portion 73. As will be described later, the inner end plate 7 and the outer end plate 6 are bonded together by the bonding portion 74.

In this embodiment, two guide cut lines 72A and 72B are formed on the side edge 7C side. The two guide cut lines 72A and 72B are substantially parallel to the cut line 71 for incision, and are arranged on the opposite end edge 7B side from the bent end edge 7A at a predetermined interval. Further, the two guide cut lines 72A and 72B are positioned so as to be closer to the side edge 7C toward the opposite edge 7B from the bent edge 7A. Further, the incision cut line 71 and the two guide cut lines 72A and 72B overlap each adjacent cut line in the direction from the bent end edge 7A to the opposed end edge 7B.
The leading edge 72A1 on the side edge 7C side of the guide cut line 72A is on the opposite edge 7B side and is bent in the direction of the side edge 7C. The angle formed by the guide cut line 72A and the tip 72A1 is preferably the same as the angle formed by the cut line 71 for cutting and the tip 71C2.

3 is a partially enlarged view showing the bottom plate and the inner end plate of FIG. 2, (A) is a diagram showing the relationship of the angle of the tip of the cut line, and (B) shows the relationship of the interval of the cut line. FIG. In FIG. 3, some symbols are omitted.
As shown in FIG. 3A, the angle of the tip 71C2 on the side edge 7C side of the incision 71C disposed on the most side edge 7C side satisfies the relationship represented by the following formula (F1). preferable.
θ1> θ (F1)
In the above formula (F1), θ1 is an angle formed between the bent edge 7A and the tip 71C2 on the side edge 7C side of the cut edge 71C arranged on the most side edge 7C side. θ1 is preferably 15 ° or more. Further, θ is a bent end edge 7A, and a side end edge 7C when an end portion on the side end edge 7C side of the guide cut 72B arranged closest to the opposite end edge 7B is extended to the side end edge 7C side. The angle formed by the line connecting the intersections 7C1.
When the relationship of the above formula (F1) is not satisfied, the lateral force becomes strong at the time of opening, and it becomes difficult to guide the breakage to the guide cut line 72A arranged on the opposite end edge 7B side, so that the opening property is deteriorated. There is a fear.

As shown in FIG. 3B, it is preferable to set the interval t1 between the cut lines 71 and 72B for incision and the two guide cut lines 72A and 72B within a range of 3 mm to 5 mm. If the interval t1 is less than 3 mm, the carton strength may be reduced, and if the interval t1 exceeds 5 mm, the unsealing property may be deteriorated.
Further, the overlap t2 of the incision cut line 71 and the two guide cut lines 72A and 72B with the adjacent cut lines in the direction from the bent edge 7A to the opposed edge 7B is in the range of 3 mm to 5 mm. It is preferable to set within. If the overlap t2 is less than 3 mm, there is too little area where each cut line overlaps, so there is a risk that smooth breakage will not occur at the time of opening. If the overlap t2 exceeds 5 mm, the overlap area will increase and the carton strength will increase. May get worse.

[Packaging method with blank board]
Next, a packaging method using the blank plate 10A will be described with reference to FIG.
FIG. 4 is a perspective view showing a state in which the carton 10 is packaged. FIG. 4 shows a perspective view of a configuration in which the bottom plate 3 is arranged on the upper side in order to facilitate understanding of the configuration of the present invention.
First, from the state shown in FIG. 1, the side surface plate 2 is bent in a direction in which the side surface plate 2 stands with respect to the bottom surface plate 3 along a bending line between the bottom surface plate 3 and the side surface plate 2. Next, the top plate 1 is bent toward the bottom plate 3 along a bend line between the side plate 2 and the top plate 1. Next, the upper overlapping side surface plate 5 is bent toward the bottom surface plate 3 along a folding line between the top surface plate 1 and the upper overlapping side surface plate 5. In addition, the lower overlap side plate 4 is bent in a direction in which the lower overlap side plate 4 is raised with respect to the bottom plate 3 at a bend line between the bottom plate 3 and the lower overlap side plate 4. Then, as shown in FIG. 4, the upper overlap side plate 5 is overlaid on the lower overlap side plate 4. Thus, the body 10B is formed into a cylindrical shape by the top plate 1, the side plate 2, and the bottom plate 3, and the overlapped lower and upper side plates 4 and 5. In addition, the overlap | superposed lower side surface board 4 and the upper side surface board 5 may adhere | attach with an adhesive agent, and do not need to adhere | attach.

Next, the side flaps 8 and 9 are folded in the direction toward the inside of the body 10B. Then, after bending the inner end plate 7 so as to overlap the side flaps 8, 9, an adhesive is applied to a region of the inner end plate 7 that contacts the outer end plate 6 and forming the bonding portion 74 in the opening portion 73. . Subsequently, the outer face plate 6 is folded so as to overlap the inner face plate 7, the outer face plate 6 and the inner face plate 7 are overlapped, and the outer face plate 6 and the inner face plate 7 are bonded by the bonding portion 74. Thereby, as shown to FIG. 5 (A), the carton 10 is shape | molded in prismatic shape, and will be in a sealing state. 5A shows a perspective view of a configuration in which the bottom plate 3 is disposed on the upper side in order to facilitate understanding of the configuration of the present invention. In this state, since the outer face plate 6 and the inner face plate 7 are bonded by the bonding portion 74, the prismatic shape can be maintained.
It should be noted that an article to be packaged (not shown) may be accommodated in the carton 10 by forming the body 10B and putting the body 10B into the body 10B, and then bonding the outer end plate 6 and the inner end plate 7 together. . Moreover, after placing the article to be packaged on the bottom plate 3 of the blank plate 10A before forming the body 10B, the body 10B is formed in a cylindrical shape, and the outer end plate 6 and the inner end plate 7 are bonded together. You may accommodate in the carton 10. FIG.

[Opening the carton]
When opening the carton 10, the opening assisting portion 32 partitioned by the bottom plate 3 is pushed toward the inside of the carton 10. As a result, the cut line 31 for pressing is broken, and the opening assisting portion 32 is pushed into the carton 10. Subsequently, a finger is put into a space formed by the opening assisting portion 32 being pushed into the inside of the carton 10, and the wife plate composed of the outer wife plate 6 and the inner wife plate 7 is gripped, and the wife plate is attached to the top plate 1 side. Pull up. Thereby, it cut | disconnects along the incision cut line 71 and the guide cut line 72 which were formed in the inner side face board 7, and as shown to FIG. 5 (B), the carton 10 is opened.

[Operational effects of this embodiment]
According to the present embodiment as described above, the following effects can be obtained.
(1) An adhesive portion 74 for adhering the inner end plate 7 and the outer end plate 6 is formed on the opening 73 defined by the guide cut line 72 and the incision cut line 71. As described above, since the guide cut line 72 and the incision cut line 71 are not formed in the region where the bonding part 74 is formed, the deterioration of the unsealing property due to the overlapping of the bonding part 74 and the cut lines 71 and 72 is prevented. Can be avoided.
(2) The incision cut line 71 is formed on the bent edge 7A from the both ends of the press cut line 31 to the two side edges 7C and 7D. Therefore, the strength of the bent edge 7A is maintained as compared with the case where the cut line 71 for incision is formed on the bent edge 7A from the cut line 31 for pressing to the side edges 7C and 7D. The strength of the carton 10 can be maintained above a certain level. As a result, even when the carton 10 is being stored or transported, it is possible to reduce the occurrence of tearing from the incision line 71 formed on the bent edge 7A.

(3) Two guide cut lines 72A and 72B are formed on the side edge 7C side. By forming the two guide cut lines 72A and 72B on the side edge 7C side, the area of the opening portion 73 defined by the guide cut line 72 and the incision cut line 71 can be increased. Therefore, since the area of the bonding portion 74 formed on the opening portion 73 can be increased, the inner end plate 7 and the outer end plate 6 can be bonded more firmly. In addition, since the area of the bonding portion 74 can be increased, it is possible to use an adhesive application device that forms a linear bonding portion that is generally used. In manufacturing the carton of the present invention, It is not necessary to newly introduce a special adhesive application device that forms a shaped adhesive portion.
The two guide cut lines 72A and 72B are substantially parallel to the cut line 71 for incision and are arranged on the opposite end edge 7B side from the bent end edge 7A at a predetermined interval. Moreover, it is located so that it may approach the side edge side 7C as it goes to the opposing edge 7B from the bending edge 7A. Further, the incision cut line 71 and the two guide cut lines 72A and 72B overlap each adjacent cut line in the direction from the bent end edge 7A to the opposed end edge 7B. For this reason, at the time of opening, first, the cut line 31 for pressing is broken, and then the cut line 71 for incision is broken halfway toward the side edge 7C. Next, from the both ends of the cut incision line 71 that has been broken, the incision cut line 71 and the guide cut line 72A are broken in a stressed direction, and the broken portion reaches the guide cut line 72A. To do. Next, the guide cut line 72A is broken from the reached broken portion to the end on the side edge 7C side. Subsequently, from the end portion of the broken guide cut line 72A, the gap between the guide cut line 72A and the guide cut line 72B is broken in a stressed direction, and the broken portion reaches the guide cut line 72B. The guide break line 72B is broken and reaches the side edge 7C. Thus, since it is fractured | ruptured sequentially along each cut line, even if it is a shape where the height of the carton 10 is low, favorable openability can be obtained.

(4) The distal ends 71B1 and 71C1 of the incision cuts 71B and 71C on the opening assisting portion 32 side are bent toward the opening assisting portion 32 on the opposite end edge 7B side.
For this reason, at the time of opening, after the rupture portion reaches the end portion on the side edge 7C side of the incision cut 71A, it breaks in the direction in which stress is applied from the end portion of the cut incision 71A. . Then, the breaking portion reaches the bending of the tip 71B1 on the opening assisting portion 32 side of the cutting cut 71B adjacent on the side edge 7C side of the broken cutting cut 71A, so that the breaking direction has a bending. It is guided to the incision 71B. Further, the breakage from the incision cut 71B to the incision cut 71C is performed in the same manner as described above. Thereby, in the cut line 71 for incision, each cut line can be favorably broken from the opening assisting part 32 side to the side edge 7C side.
(5) Of the three incision cuts 71A, 71B, 71C, the distal end 71C2 on the side edge 7C side of the cut edge 71C arranged on the most side edge 7C side is on the opposite end edge 7B side, It is bent in the direction of the side edge 7C. For this reason, at the time of opening, after the rupture portion reaches the end portion on the side edge 7C side of the incision cut 71C arranged closest to the side edge 7C, the rupture direction is provided at the tip 71C2. Guided towards the direction of bending. And a fracture | rupture part reaches | attains to the cutting | disconnection line 72A for a guide arrange | positioned at the front-end | tip edge 7B side ahead of a bending direction. Thereby, it can be smoothly broken from the incision cut line 71 to the guide cut line 72A.
(6) The distal end 72A1 on the side edge 7C side of the guide cut line 72A is on the opposite edge 7B side and is bent in the direction of the side edge 7C. For this reason, at the time of opening, after the broken portion reaches the end portion on the side edge 7C side of the guide cut line 72A, the breaking direction is guided toward the bending direction provided at the tip 72A1. And a fracture | rupture part reaches | attains even to the cutting | disconnection line | wire 72B for a guide arrange | positioned in the front-end | tip edge 7B side ahead of a bending direction. Thereby, it can be smoothly broken from the guide cut line 72A to the guide cut line 72B.

[Modification]
The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the object and effect. It goes without saying that modifications and improvements within the scope are included in the content of the present invention.
For example, in the above-described embodiment, the two guide break lines 72A and 72B are formed. However, the present invention is not limited to the two guide break lines, but may be composed of three or more guide break lines. Good.

  In the above embodiment, the incision cut line 71 is constituted by the three incision cuts 71A, 71B, 71C. However, the incision cut line 71 is not limited to the three incision cuts, and may be constituted by two incision cuts. Moreover, it may be composed of four or more incisions for incision.

In the above-described embodiment, the distal ends 71B1 and 71C1 of the incision cuts 71B and 71C on the opening assisting portion 32 side, the distal end 71C2 on the side edge 7C side of the incision cut 71C, and the side edge of the guide cut line 72A Although the configuration in which the distal end 72A1 on the 7C side is bent in a specific direction has been shown, the incision cut line of the incision cut line and the front end in the guide cut line have a bend in such a specific direction. The structure may be omitted.
Further, instead of the above bending, as shown in FIG. 6, the leading ends 72A2 and 72B2 of the two guide break lines 72A and 72B on the opening assisting portion 32 side are the bent end edge side 7A, and the opening assisting portion It may be bent in the direction of 32.
Moreover, in the said embodiment, although it was set as the structure which formed each cut line only in any one wife face like the blank board 10A shown in FIG. 1, and the carton 10 shown in FIG. However, the present invention is not limited to this, and a configuration may be adopted in which each cut line is formed on both wife faces.
Moreover, in the said embodiment, although it was set as the shape in which a space part is formed by pushing the opening assistance part 32 with a finger, the opening assistance part 32 is not restricted to the said pushing shape, The shape which hooks a finger, and a holding part are used. You may make it the shape which has.

  In addition, there is no problem even if the specific structure and shape in carrying out the present invention are other structures and shapes as long as the objects and effects of the present invention can be achieved.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited at all by these examples.

[Example 1, Comparative Examples 1-3]
As Example 1, a blank plate having the configuration shown in FIG.
Moreover, as Comparative Examples 1 to 3, blank plates having a configuration in which each cut line is shown in FIGS. 7 to 9 were prepared.
In Comparative Example 1, as shown in FIG. 7, a cut line 171 made of a small cut formed at the side edge 7C from the point P1, which is the end of the cut line 31, is provided on the bent edge 7A. Blank board. On the bent edge 7A, a cut line 171 consisting of a small cut is also formed from the point P2 to the side edge 7D.
In Comparative Example 2, as shown in FIG. 8, a cut line 271 made of a large cut formed at the side edge 7C from the point P1, which is the end of the cut line 31 for cut-off, is provided on the bent edge 7A. Blank board. On the bent edge 7A, a cut line 271 having a large cut is also formed from the point P2 to the side edge 7D.
As shown in FIG. 9, Comparative Example 3 is a blank plate in which a linear cut line 172 is provided on the inner end plate 7 from the point P <b> 1, which is the end of the cut line 31 for pressing, toward the side edge 7 </ b> C. is there. That is, the straight cut line 172 obliquely crosses the inner end plate 7 and is configured to intersect the side edge 7C at the intersection 7C1. Here, the angle formed between the bent edge and the cut line 172 is less than 15 °. A straight cut line 172 is also formed on a straight line connecting the point P2 and the cut 7D1 of the side edge 7D.
The material of the blank plate of Example 1 and Comparative Examples 1 to ^{3 is} a coated ball having a weight of 270 to 350 g / m ³ .
Next, a carton was prepared from the prepared blank plate, and the process suitability at the time of molding was evaluated. In addition, the carton strength and openability of the produced carton were evaluated, and comprehensive evaluation was performed based on these three evaluation results. The results are shown in Table 1.

  * 1: If at least one of the above three evaluation items has an evaluation of “x”, the overall evaluation is an evaluation of “x”.

As is clear from Table 1, when Comparative Examples 1 and 2 were compared, there was almost no influence on suitability on the molding process due to the difference in the size of the cut (size of the cut). However, as in Comparative Example 2, when the cutting depth was increased, the carton opening performance was improved, but the carton strength could not be maintained above a certain level. On the other hand, as in Comparative Example 1, in order to increase the strength of the carton to a certain level or more, when the cut of the cut line was reduced, the unsealing property of the carton was deteriorated.
In Comparative Example 3, the strength of the carton could be maintained above a certain level. However, when the inner face plate 7 provided with the cut line 172 was bent in the molding process, the carton was bent along the cut line 172. There was a risk of getting lost. From this result, it is inferred that when a straight cut line 172 that obliquely crosses the inner end plate 7 is provided, the strength of the carton is reduced.
On the other hand, in Example 1, since the guide cut lines 72A and 72B are not provided along the bent end edge 7A, the strength of the carton is maintained at a certain level or more. Further, the guide cut lines 72A and 72B obliquely cross the inner end plate 7 from the point P1, which is the end of the press cut line 31, to the side edge 7C when the cut lines are viewed integrally. It is configured as follows. However, since the guide cut lines 72A and 72B of Example 1 are not formed in a straight line like the cut line 172 of Comparative Example 3, there is a risk that the guide cut lines 72A and 72B bend along the cut line in the molding process. It is inferred that this can be reduced.

  The carton of the present invention can be applied to containers for storing various items such as food, cosmetics, industrial products, toys and stationery.

  6 ... Outer side plate, 7 ... Inner side plate, 7A ... Bending edge, 7B ... Opposing end edge, 7C, 7D ... Side edge, 10 ... Carton, 10B ... Body, 32 ... Opening assisting part, 71 ... Incision cut Line, 72 ... guide cut line, 72A, 72B ... guide cut line, 73 ... opening part, 74 ... adhesive part, P1, P2 ... point.

Claims (3)

A carton in which both ends of the opening side of the body formed in a cylindrical shape are closed by folding an inner end plate and an outer end plate connected to the both ends via bent edges,
The inner end plate is formed in a quadrangular shape having the bent end edge, an opposite end edge facing the bent end edge, and two side end edges connecting the end portions of the bent end edge and the opposite end edge. And
On the surface of the body that is connected to the inner end plate via the bent end edge, an opening assisting portion that connects two spaced points on the bent end edge is defined,
In the bent end edge, cut lines for incision extending from both ends of the opening assisting portion toward the two side end edges are formed, respectively.
A guide cut line having a predetermined length extending toward each of the two side edges is formed on the inner end plate. The guide cut line and the incision cut line are integrated with the opening assisting unit. The opening part is marked,
The inner end plate and the outer end plate are bonded by an adhesive portion formed in the opening portion,
The cut line for incision is respectively formed from the both ends of the opening assisting part to the middle toward the two side edges,
A plurality of the guide cut lines are formed on each side edge side,
The plurality of guide cut lines are substantially parallel to the incision cut line and are arranged on the opposite end side from the bent end edge at a predetermined interval, and from the bent end edge to the opposite end. Located toward the side edge toward the edge,
The incision cut line and the plurality of guide cut lines have an overlap with each adjacent cut line in the direction from the bent end edge to the opposing end edge. The carton of claim 1,
The incision line is composed of a plurality of incisions,
The tip of the opening assisting portion side of at least one incision cut among the plurality of incision cuts is on the opposite edge side and bends in the direction of the opening assisting portion,
Among the plurality of incision cuts, the tip of the side edge side of the incision cut arranged on the most side edge side is the opposite edge side, and is bent in the direction of the side edge,
A tip of the side end edge side of at least one guide cut line among the plurality of guide cut lines is on the opposite end side and is bent in the direction of the side edge. carton. The carton of claim 1,
The carton characterized in that the leading end of the guide cut line on the side of the opening assisting portion is on the bent edge side and is bent in the direction of the opening assisting portion.

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