JP2022104406A - Packaging box and use method of the same - Google Patents

Abstract

To provide a packaging box which seldom deforms even when multiple packaging boxes are stacked, and is easy to observe and take out a packaged item of each packaging box in a state in which the packaging boxes are stacked.SOLUTION: A pair of first break guide wires 8 extending in a direction X is provided at a top wall part 4 of a base material sheet 2 composing a packaging box 1 so as to pass through a position separated from both ends of the top wall part 4 in the direction X. The first break guide wire 8 extends over the entire length of the top wall part 4 in the direction X, and extends to portions of a front wall part 3 and a back wall part 5 which are closer to the top wall part 4. A second break guide wire 9 connected to the pair of first break guide wires 8 and extending in a direction Y is provided on at least one of the front wall part 3 and the back wall part 5. At the front wall part 3 and the back wall part 5, there is a portion 80 in which a gap between the pair of first break guide wires 8 gradually decreases from the top wall part 4 toward a bottom wall part 6, and an angle θ on the acute angle side at the portion 80 between the first break guide wire 8 and the direction Y is 30-70 degrees.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wrap-round type packaging box that wraps an article so as to wrap it.

As a packaging box for packing various products, the A type (mandarin orange box type) and the wrap round type are known. In a wrap-round type packaging box, an object to be packaged is generally placed on a cardboard sheet, and the cardboard sheet is bent so as to wrap the object to be packaged, so that the assembly and packaging of the box can be completed at the same time. Therefore, it is easier to automate the packaging work of the product as compared with the A-type packaging box, and it is advantageous for packaging a relatively heavy object to be packaged such as a canned beverage. On the other hand, the corrugated sheet has a stronger strength in the direction in which the flute extends due to the corrugated member inside (eye direction, paper width direction) than in the direction orthogonal to the eye direction (flow direction), and is a wrap round type. In general, the packaging box of the cardboard sheet constituting the front wall portion and the back wall portion erected from the bottom wall portion toward the top wall portion is in the vertical direction (direction in which the strength is relatively strong). Therefore, the front wall portion and the back wall portion are relatively strong against an external force acting in parallel in the vertical direction, but weak in an external force acting in parallel in the horizontal direction. It has been devised to prevent deformation of the box by using it.

In recent years, for the purpose of saving labor costs and reducing waste, a part of the packaging box used for transportation, for example, a part of the top wall part and a part of the front wall part or the back wall part is cut out and packaged. A sales form is adopted in which an opening for observing or taking out a product is formed, and the product is displayed on the shelf together with the cardboard box without rearranging the product from the cardboard box to the display shelf. It is becoming like that. However, as described above, since the wrap-round type packaging box has low horizontal strength of the front wall portion and the back wall portion, the packaging box is easily deformed when the opening is formed, and in particular, a plurality of packaging boxes are stacked. In this case, problems such as the packaging box buckling and the packaged object falling may occur.

In Patent Document 1, a trapezoidal break guide wire is provided on the top wall portion as a wrap-round type packaging box in which the top surface can be easily opened without substantially reducing the load bearing capacity. The one in which the opening can be formed without cutting the side surface of the box is described. Since the packaging box described in Patent Document 1 has an opening only on the top surface, for example, when a plurality of the packaging boxes containing the products are displayed in a stacked state, the products should be taken out only from the uppermost packaging box. It is inconvenient because it cannot be done.

In Patent Document 2, a joint piece connected to the front end of the top wall portion is attached to the upper part of the outer surface of the front wall portion, and the end face is closed and sealed. A structure is described in which a portion is provided, the top wall portion is cut open upward from the tear starting portion, and the front opening portion of the front wall portion is cut open in a flap shape. The packaging box described in Patent Document 2 solves the problem that even when the front opening is made small in order to secure the strength of the box, the packaging box returns due to repulsion when the front opening is opened. However, it does not secure a sufficient opening size for taking out the packaged object.

In Patent Document 3, a knob portion and a first planned cutting line extending from the knob portion to both corners on the top wall portion side are provided substantially in the center of the front wall portion, and a boundary between the front wall portion and the top surface wall portion is provided. A wrap-round type packaging box is described in which a front opening planned portion surrounded by the ridge line and the first scheduled cutting line is formed in the front wall portion. In the packaging box described in Patent Document 3, when the first planned cutting line is broken, the pre-opening planned portion can be triggered, and by further pulling up the plate material of the triggered pre-opening planned portion. The top wall portion is torn to form an open surface extending from the front surface side to the top surface side. In the packaging box described in Patent Document 3, in the state where the open surface is formed, the top wall portion is not cut off from the packaging box and remains integrated. Therefore, a plurality of the packaging boxes are stacked in that state. In addition, since the entire top surface is opened in that state, it is difficult to stack a plurality of the packaging boxes, and there is a problem that the lower packaging box is easily crushed when the packaging boxes are stacked.

Japanese Unexamined Patent Publication No. 2000-309333 Japanese Unexamined Patent Publication No. 2015-40056 Japanese Unexamined Patent Publication No. 8-34430

An object of the present invention is to provide a wrap-round type wrapping that can eliminate the above-mentioned drawbacks of the prior art, and more specifically, the wrapping box is not easily deformed even when a plurality of packaging boxes are stacked, and the plurality of packaging boxes are stacked. It is an object of the present invention to provide a packaging box in which the objects to be packaged in each packaging box can be easily observed and taken out in a stacked state.

In the present invention, the front wall portion, the top wall portion, the back wall portion, and the bottom wall portion are connected to each other in the first direction via a crease line, and the square cylinder portion forming portion is the first. The square tube forming portion includes a base material sheet having flaps protruding in a second direction orthogonal to the first direction from both end edges along the direction of 1, and wraps the packaged object in use. Is a wrap-round type packaging box, which is formed into a box by bending the square tube at the crease line to form a square tube and closing the opening of the square tube with the flap. A pair of first break guide lines extending in the first direction are provided so as to pass through positions separated from both end edges of the top wall portion along the first direction. The break guide line extends over the entire length of the top wall portion in the first direction, and extends to each of the front wall portion and the back wall portion near the top wall portion, and the break guide line extends to the front wall portion. A second break guide line connected to each of the pair of first break guide lines and extending in the second direction is provided on at least one of the portion and the back wall portion, and the front wall portion and the back wall portion are provided. There is a portion in the portion where the distance between the pair of first break guide lines gradually decreases from the top wall portion toward the bottom wall portion, and the first break guide line and the second direction in the portion. The packaging box has an acute angle of 30 to 70 degrees.

Further, in the present invention, a plurality of the packaging boxes of the present invention containing the object to be packaged are prepared, and the portion of each of the plurality of packaging boxes surrounded by the break guide line is cut off to form an opening, and further. It is a method of using a packaging box in which the plurality of packaging boxes having the openings formed are stacked in a predetermined number of stages and stored, distributed or displayed in the stacked state.

According to the present invention, there is a packaging box that is not easily deformed even when a plurality of packaging boxes are stacked and that the packaged object of each packaging box can be easily observed and taken out in a state where the plurality of packaging boxes are stacked. Provided. Further, since the packaging box of the present invention is a so-called wrap-round type, it is easy to automate the packaging work of the object to be packaged, which is useful for manufacturing packages of various products.
Since the packaging box of the present invention has sufficient strength for practical use even in a state where an opening is formed by using a break guide wire, an article having a relatively strong strength of the packaged body itself, such as a canned product. Of course, it is also useful as a packaging box for foods having a relatively low strength of the object to be packaged, such as a packaged confectionery, which is packaged in a bag-shaped packaging material.

FIG. 1 is a schematic perspective view of an embodiment of the packaging box of the present invention when viewed from the front wall portion side. FIG. 2 is a developed view schematically showing the packaging box shown in FIG. 1 by partially breaking it. FIG. 3 is a schematic plan view of the front wall portion of the packaging box shown in FIG. FIG. 4 is a perspective view schematically showing an example of how to use the packaging box shown in FIG. 1.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

FIG. 1 shows a packaging box 1 which is an embodiment of the packaging box of the present invention, and FIG. 2 shows a development view of the packaging box 1 (a plan view of a base sheet 2 constituting the packaging box 1). There is.
The packaging box 1 includes a base sheet 2. The base material sheet 2 includes a square tube portion forming portion 2A in which the front wall portion 3, the top wall portion 4, the back wall portion 5, and the bottom wall portion 6 are connected to each other in the first direction X via the fold line FL. It has flaps 2B protruding in a second direction Y orthogonal to the first direction X from both end edges of the square tube portion forming portion 2A along the first direction X.
The packaging box 1 is a wrap-round type packaging box, and when used, the square tube portion forming portion 2A is bent at the crease line FL so as to wrap the object to be packaged (not shown) to form the square tube portion 2A1. By closing the opening (not shown) of the square tube portion 2A1 with the flap 2B, a box body as shown in FIG. 1 is obtained.

In the present embodiment, the packaging box 1 has a rectangular cuboid shape as shown in FIG. 1, and has a front surface composed of a front wall portion 3 and a back surface composed of a back wall portion 5 and located on the opposite side of the front surface. It has a top surface composed of a top surface wall portion 4, a bottom surface composed of a bottom surface wall portion 6 located on the opposite side of the top surface, and a pair of side surfaces composed of a pair of flaps 2B and 2B facing each other.

In the present embodiment, as shown in FIG. 2, the base sheet 2 is bisected in the second direction Y and unilaterally with respect to the virtual center line CL extending in the first direction X. And the other side are formed symmetrically. The second direction Y coincides with the horizontal direction.

In the present embodiment, as shown in FIG. 2, the square tube portion forming portion 2A further has a glue margin portion 7 in addition to the wall portions 3 to 6. The glue margin portion 7 has a trapezoidal shape in a plan view, and is connected to an edge portion of the front wall portion 3 opposite to the top wall portion 4 side. Therefore, in the present embodiment, the square tube portion forming portion 2A is configured by connecting the glue margin portion 7, the front wall portion 3, the top wall portion 4, the back wall portion 5, and the bottom wall portion 6 in this order. When forming the square tube portion 2A1, the glue margin portion 7 is joined to the edge portion of the bottom wall portion 6 opposite to the back wall portion 5 side via an adhesive.
In the present invention, the order in which the front wall portion 3, the top wall portion 4, the back wall portion, the bottom wall portion 6, and the glue margin portion 7 are connected to each other in the square tube portion forming portion 2A is not limited to the illustrated form. It can be arbitrarily set on condition that the square tube portion 2A1 having the front surface and the back surface facing each other with the top surface and the bottom surface facing each other can be formed.

In the present embodiment, as shown in FIG. 2, the flap 2B is connected to the inner flap 23 connected to the front wall portion 3, the outer flap 24 connected to the top wall portion 4, and the back wall portion 5. The inner flap 25 and the outer flap 26 connected to the bottom wall portion 6 are included. When forming the square tube portion 2A1, first, the inner flaps 23 and 25 are bent inward at the crease line FL, and then the outer flaps 24 and 26 are overlapped on the outer surface of the bent inner flaps 23 and 25. Bend at the crease line FL. If necessary, the overlapped flaps 23 to 26 may be bonded to each other with an adhesive. In this way, the pair of openings (not shown) of the square tube portion 2A1 formed by bending the square tube portion forming portion 2A are closed by the pair of flaps 2B.

In the present embodiment, as shown in FIG. 1, the outer flap 26 connected to the bottom wall portion 6 forms the side surface of the packaging box 1, and the outer flap 24 connected to the top wall portion 4 is the outer flap 26. However, on the contrary, the outer flap 24 may be located outside the outer flap 26. Similarly, in the packaging box 1, either the inner flap 23 or the inner flap 25 may be on the outer side, and the lengths of the inner flap 23 and the inner flap 25 in the second direction Y are adjusted to form the box body. Both inner flaps 23 and 25 may not overlap each other when formed.

The base sheet 2 (square tube forming portion 2A, flap 2B) is not particularly limited as long as it can be used as a packaging / packing material, and various types of paper, resin sheets, or composites obtained by laminating these are not particularly limited. A sheet or the like can be used, and it can be appropriately selected depending on the type of the object to be packaged and the like.
In the present embodiment, the base sheet 2 is a corrugated cardboard sheet. As shown in FIG. 2, the base sheet 2 which is a corrugated cardboard sheet has a three-layer structure of a pair of liners 21 and 21 facing each other and a core 22 interposed between the pair of liners 21 and 21. Have. The core 22 is a corrugated sheet in which ridges and grooves are alternately arranged in one direction. In the present technology, the extending direction of the ridges and grooves is "eye direction" (paper width direction). The direction orthogonal to the eye direction is called the "flow direction". In the present embodiment, the eye direction of the base sheet 2 which is a corrugated cardboard sheet is the first direction X, that is, the direction in which the respective parts 3 to 7 constituting the square tube portion forming portion 2A are connected (longitudinal length of the base sheet 2). The direction), and the flow direction of the base sheet 2 coincides with the second direction Y.

The top wall portion 4 is provided with a pair of first breaking guide lines 8 and 8 extending in the first direction X so as to pass through positions separated from both end edges along the first direction X of the top wall portion 4. ing. The "edge of the top wall portion 4 along the first direction X" is identified with the crease line FL located at the boundary between the top wall portion 4 and the outer flap 24 connected to the top wall portion 4. can.

As shown in FIGS. 1 and 2, the pair of first break guide lines 8 and 8 extend over the entire length of the top wall portion 4 in the first direction X, and the front wall portion 3 and the back wall portion 5 respectively. It extends to the part near the top wall portion 4 (upper side of the packaging box 1).

In the present embodiment, the first breaking guide line 8 is a straight line parallel to the first direction X in the top wall portion 4. However, in the present invention, the first breaking guide line 8 extends in the first direction X, more specifically, if the angle formed by the first direction X on the acute angle side is less than 45 degrees. Well, it may also contain curves.

The first breaking guide wire 8 is a plan-viewing portion processed so that the operator can easily break it by hand without using a tool such as a cutter or a jig. As the first break guide wire 8, the one adopted as the break guide wire of this type of corrugated cardboard box can be used without particular limitation. As an example of the first breaking guide wire 8, a portion subjected to perforation processing and / or half-cut processing can be mentioned. The "perforation processing" here is a processing method for forming cut portions (perforations) penetrating the base sheet 2 in the thickness direction at regular intervals, and the "half-cut processing" is made of corrugated cardboard. This is a processing method for cutting one of a pair of liners 21 and 21 (for example, the liner 21 on the inner surface side of the packaging box 1) constituting the base sheet 2. In the half-cut process, the core 22 may be further cut in addition to the liner 21.

At least one of the front wall portion 3 and the back wall portion 5 is provided with a second break guide wire 9 connected to each of the pair of first break guide wires 8 and 8 and extending in the second direction Y.
In the present embodiment, as shown in FIG. 2, a second breaking guide line 9 is provided on both the front wall portion 3 and the back wall portion 5. In each of the front wall portion 3 and the back wall portion 5, the second break guide line 9 has a second direction between one longitudinal end and the other longitudinal end of the pair of first break guide lines 8, 8. It extends parallel to Y (horizontal direction).

The second break guide wire 9 may be configured in the same manner as the first break guide wire 8, and may be, for example, a machined portion to be perforated, but the front wall portion 3 of the wrap round type packaging box 1 and the front wall portion 3 If the back wall portion 5 is perforated, the strength of the packaging box 1 may be lowered. Therefore, the front wall portion 3 and the back wall portion 5 are not perforated or are perforated. However, instead of using the entire second break guide wire 9 as the machined portion for perforation processing, a part of the second break guide wire 9, specifically, for example, the longitudinal direction of the second break guide wire 9. It is preferable that only the end portion is the workpiece to be perforated.

In the present embodiment, the second breaking guide wire 9 has a pair of cut portions 91 provided at both ends of the second break guide wire 9 in the longitudinal direction and the pair of cut portions 91 on the inner surface of the base sheet 2. , 91 is configured to include a cut tape (not shown) attached between the frames. A part of the base sheet 2 is cut and the cut portion 91 can be picked by a finger, and can function as a picked portion. As the cut tape, a resin-made or non-resin-made base material sheet on which an adhesive is applied can be used. In the second breaking guide wire 9 configured in this way, the cut tape is pulled in the same direction by picking one of the pair of cut portions 91 and 91 with a finger and pulling it toward the other, and the pulling thereof is performed. It is broken by the cut tape that is made.

As shown in FIGS. 1 to 3, in the front wall portion 3 and the back wall portion 5, the distance between the pair of first breaking guide lines 8 and 8 gradually decreases from the top wall portion 4 to the bottom wall portion 6. There is a portion (hereinafter, also referred to as a “breakage guide line spacing reduction portion”).
In the present embodiment, the pair of first breaking guide lines 8 and 8 are formed symmetrically with respect to the virtual center line CL in each of the front wall portion 3 and the back wall portion 5. Then, each of the first breaking guide lines 8 is a bottom wall portion while facing inward in the second direction Y from the crease line FL located at the boundary between the top wall portion 4 and the front wall portion 3 or the back wall portion 5. It extends toward the 6 side, and is a straight line extending in a direction that intersects both the first direction X and the second direction Y in a plan view without being orthogonal to each other.

One of the main features of the packaging box 1 is the acute angle side (outer side of the second direction Y) of the angle formed by the first break guide line 8 and the second direction Y in the break guide line interval reducing portion 80. The point is that the angle θ (see FIG. 3) is 30 to 70 degrees. When the angle θ is within the specific range, the packaging box 1 has practically sufficient strength even when the base sheet 2 is broken by the breaking guide lines 8 and 9 to form an opening, and the packaging box 1 has sufficient strength. It facilitates observation and removal of the packaged object through the opening. The angle θ is preferably 40 to 65 degrees.

FIG. 4 shows an example of how to use the packaging box 1. In the usage method shown in FIG. 4, a plurality (three) packaging boxes 1 are prepared, and the portions surrounded by the break guide lines 8 and 9 in each of the plurality of packaging boxes 1 (the portions surrounded by the dotted lines in FIG. 2). ) Is cut off to form an opening 1H, and a plurality of (three) packaging boxes 1 in which the opening 1H is formed are stacked in a predetermined number of stages (three stages). In the plurality of vertically stacked packaging boxes 1, not only the uppermost packaging box 1 in which the opening 1H is completely exposed, but also the middle and lowest packaging boxes 1 are exposed. Since a part of the opening 1H is formed in the front wall portion 3 and the back wall portion 5, it is possible to easily observe and take out the packaged object in the packaging box 1 through the opening 1H. .. In particular, in the middle and bottom packaging boxes 1, since the openings 1H are formed in both the front wall portion 3 and the back wall portion 5 facing each other, one of the front wall portion 3 and the back wall portion 5 is formed. When observing the inside of the packaging box 1 from the opening 1H, a sufficient amount of light can be supplied to the inside of the packaging box 1 through the opening 1H on the side opposite to the observation surface side. Can be easily observed and taken out.
As described above, the packaging box 1 is not easily deformed even when vertically stacked with the opening 1H formed, and the packaged object inside each packaging box 1 can be easily observed and taken out in the vertically stacked state. Since it can be carried out, it is suitable for storage, distribution and display in a vertically stacked state. For example, a plurality of packaging boxes 1 in which goods (objects to be packaged) are housed are manufactured at a factory, the plurality of packaging boxes 1 are vertically stacked on a pallet as shown in FIG. 4, and the pallets are transported to a store. However, in stores, it is possible to display the products in a vertically stacked state on pallets. By such a usage method, the cost including the transportation cost can be reduced.

From the viewpoint of ensuring that the predetermined effect of the present invention described above is more reliably achieved, the separation length between the pair of first breaking guide lines 8 and 8 and the both end edges of the top wall portion 4 along the first direction X. L1 (see FIGS. 1 and 2) is the distance L2 between the edges of the top wall portion 4 (see FIGS. 1 and 2; the length (width) of the packaging box 1 in the second direction Y). On the other hand, it is preferably 5 to 25%, more preferably 7 to 20%. As described above, the "both ends of the top wall portion 4 along the first direction X" are a pair of folds located at the boundary between the top wall portion 4 and the outer flap 24 connected to the top wall portion 4. It can be equated with the line of sight FL and FL. Further, the "separation length L1" and the "distance L2" to be compared here are portions that are at the same position with each other in the first direction X. That is, when one virtual straight line (not shown) crossing the base sheet 2 in the second direction Y is drawn with reference to FIG. 2, the “spacing L2” in the one virtual straight line is set. The ratio of the portion corresponding to the "separation length L1" to the corresponding portion is preferably in the range of 5 to 25%. If the ratio L1 / L2 is too small, the strength of the packaging box 1 in a state where the base sheet 2 is broken by the first breaking guide line 8 to form an opening is lowered, and the opening is as shown in FIG. It may be difficult to vertically stack a plurality of packaging boxes 1 in a state where 1H is formed. Further, if the ratio L1 / L2 is too large, the opening formed by breaking the base sheet 2 with the first breaking guide wire 8 becomes small, and the object to be packaged inside the packaging box 1 can be observed and taken out. It can be difficult.

In the present embodiment, the separation length L1 is constant over the entire length of the first break guide line 8, that is, the first break guide line 8 is the edge (heaven) along the first direction X of the top wall portion 4. Although it is parallel to the crease line FL) located at the boundary between the surface wall portion 4 and the outer flap 24, in the present invention, the first breaking guide line 8 is the edge of the top surface portion 4 along the first direction X. A form that is not parallel to the relative is also included. In the case of such a form, it is preferable that the ratio L1 / L2 is in the specific range at an arbitrary position in the first direction X.

From the viewpoint of ensuring that the predetermined effect of the present invention described above is more reliably achieved, the length L3 of the first breaking guide line 8 in the front wall portion 3 and the back wall portion 5 in the first direction X (FIG. 1). And FIG. 2) is preferably 15 to 40 with respect to the total length L4 (see FIGS. 1 and 2; the height of the packaging box 1) of the front wall portion 3 or the back wall portion 5 in the first direction X. %, More preferably 20 to 35%. If the ratio L3 / L4 is too small, the opening formed by breaking the base sheet 2 with the first breaking guide wire 8 becomes small, and it becomes difficult to observe and take out the packaged object inside the packaging box 1. There is a risk of becoming. Further, if the ratio L3 / L4 is too large, the strength of the packaging box 1 in a state where the base sheet 2 is broken by the breaking guide lines 8 and 9 to form an opening is lowered, and as shown in FIG. Vertical stacking of a plurality of packaging boxes 1 with the opening 1H formed may be difficult.

The dimensions of each part of the packaging box 1 are not particularly limited, and the dimensions, weight, number of items to be accommodated inside the packaging box 1, the distribution form of the packaging box 1, and the case where the packaging box 1 is displayed on the product shelf. Can be appropriately set according to the size of the product shelf and the like. The following is a preferable example of the dimensions of each part of the packaging box 1.
The separation length L1 (see FIGS. 1 and 2) is preferably 1 to 20 cm, more preferably 2 to 10 cm.
The length (width) of the interval L2, that is, the second direction Y of the packaging box 1 (see FIGS. 1 and 2) is preferably 10 to 80 cm, more preferably 18 to 65 cm.
The length L3 (see FIGS. 1 and 2) is preferably 2 to 24 cm, more preferably 3 to 20 cm.
The total length L4, that is, the height of the packaging box 1 (see FIGS. 1 and 2) is preferably 8 to 60 cm, more preferably 15 to 45 cm.
The depth L5 of the packaging box 1 (see FIGS. 1 and 2) is preferably 10 to 80 cm, more preferably 18 to 65 cm.

As described above, the flap 2B includes the outer flaps 24 and 26 connected to the top wall portion 4 and the bottom wall portion 6 via the crease line FL, respectively, and the second of these outer flaps 24 and 26 is included. The maximum length L6 in the direction Y (see FIG. 2) is the distance between the top wall portion 4 and the bottom wall portion 6 in the box body (the state in which the base sheet 2 is bent at the crease line FL) as shown in FIG. (Height of the packaging box 1), that is, it is preferably the same as the total length L4 (see FIGS. 1 and 2) of the front wall portion 3 or the back wall portion 5 in the first direction X. As a result, the strength of the packaging box 1 is further improved, and even if a plurality of packaging boxes 1 are vertically stacked as shown in FIG. 4, they are less likely to be deformed. Here, "the maximum length L6 is the same as the separation length between the top wall portion 4 and the bottom wall portion 6 (the total length L4 in the first direction X of the wall portions 3 and 5)" means that both are completely. This includes not only the case where they match (the ratio of both is 1) but also the case where they are slightly different but can be regarded as substantially the same (for example, when the ratio of both is in the range of 0.9 to 1.05).

The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.
For example, in the above-mentioned packaging box 1, the second break guide wire 9 is provided on both the front wall portion 3 and the back wall portion 5, but may be provided on only one of them. For example, when the second breaking guide line 9 is provided only on the front wall portion 3, the portion of the base sheet 2 surrounded by the breaking guide lines 8 and 9 is not cut off from the base sheet 2 and is not cut off from the back wall portion. Since it remains connected to the other part of the base sheet 2 between the pair of first breaking guide lines 8 and 8 of 5, it can function as a lid for opening / closing the opening 1H.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Examples 1 to 5, Comparative Examples 1 to 3]
A wrap-round type packaging box (cardboard box) having the same basic configuration as the packaging box 1 described above was manufactured and used as a packaging box for each Example and Comparative Example. The angles θ (see FIG. 3) of the packaging boxes are different from each other. With reference to FIGS. 1 and 2, the packaging boxes of the respective examples and comparative examples have the separation length L1 of 4 cm, the distance L2 (width of the packaging box) of 41 cm, the length L3 of 4 cm, and the total length. The L4 (height of the packaging box) was 16 cm, and the depth L5 was 28 cm.

[Evaluation test: Impact resistance in vertical stacking state]
From the packaging boxes of the respective examples and comparative examples, the portion surrounded by the first break guide line and the second break guide line is cut off to form an opening, and the package is packaged from the opening to the inside of the packaging box. 14 bags of wheat flour (1 kg in weight of 1 bag) packed in a bag were stored. In this way, three packaging boxes containing 14 bags of objects to be packaged are prepared for each type of packaging box to be evaluated, and as shown in FIG. 4, the corners of the packaging boxes are aligned with each other. It was vertically stacked in three stages: upper, middle, and lower. Then, the three vertically stacked packaging boxes were dropped from a height of 40 cm above the concrete floor surface perpendicularly to the floor surface while maintaining the vertically stacked state. In such a drop operation, immediately before dropping, the lower surface (ground plane) of the lower packaging box and the floor surface are made parallel to each other, and when the lower surface is dropped, the entire lower surface comes into contact with the floor surface almost at the same time. I did it. After repeating such a drop operation 10 times, the lower packaging box was visually observed and evaluated on a scale of 5 according to the following evaluation criteria. If the position of the packaging box deviates from the position before the drop due to one drop operation, the position shift is corrected before the next drop operation. For each type of packaging box to be evaluated, such a procedure (three boxes are stacked vertically and dropped 10 times) is repeated 10 times, and the arithmetic average value of the 10 evaluation points is calculated as the impact resistance of the packaging box to be evaluated. It was used as an evaluation point for sex. The higher the evaluation score, the stronger the strength of the packaging box, the less likely it is to be damaged, and the higher the evaluation. The results are shown in Table 1.

<Evaluation criteria for impact resistance in vertical stacking>
5 points: There is no deformation or crushing of the lower packaging box.
4 points: The front wall or back wall of the lower packaging box is bent or bent.
3 points: Both the front wall and the back wall of the lower packaging box are bent or bent.
2 points: There is a twist in the lower packaging box.
1 point: The entire lower packaging box is twisted, and as a result, the upper packaging box is tilted.

As shown in Table 1, in the packaging box of each embodiment, there is a portion in the front wall portion and the back wall portion in which the distance between the pair of first break guide lines gradually decreases from the top wall portion to the bottom wall portion. However, since the acute angle side angle θ of the angle formed by the first break guide line and the second direction (horizontal direction) in the portion is in the range of 30 to 70 degrees, the angle θ deviates from this range. Compared with each of the comparative examples, the impact resistance was excellent in the state where the openings were formed and a plurality of them were vertically stacked.

1 Packaging box 1H Opening 2A1 Square tube 2 Base sheet 2A Square tube forming part 2B Flap 21 Liner 22 Core 23,25 Inner flap 24,26 Outer flap 3 Front wall part 4 Top wall part 5 Back wall part 6 Bottom wall part 7 Glue margin part 8 First break guide line 80 Break guide line spacing reduction part 9 Second break guide line 91 Cut part FL Fold line X First direction Y Second direction

Claims (5)

The front wall portion, the top wall portion, the back wall portion, and the bottom wall portion are connected to each other in the first direction via the crease line, respectively, in the first direction of the square cylinder portion forming portion and the square cylinder portion forming portion. Includes a substrate sheet with flaps protruding in a second direction orthogonal to the first direction from both edges along.
At the time of use, the square tube forming portion is bent at the crease line so as to wrap the packaged object to form the square tube portion, and the opening of the square tube portion is closed with the flap to form a box body. It is a wrap-round type packaging box.
A pair of first breaking guide lines extending in the first direction are provided on the top wall portion so as to pass through positions separated from both end edges of the top wall portion along the first direction.
The pair of first breaking guide lines extend over the entire length of the top wall portion in the first direction, and extend to each of the front wall portion and the back wall portion near the top wall portion. Ori,
At least one of the front wall portion and the back wall portion is provided with a second break guide line connected to each of the pair of first break guide lines and extending in the second direction.
The front wall portion and the back wall portion have a portion in which the distance between the pair of first break guide lines gradually decreases from the top wall portion toward the bottom wall portion, and the first break in the portion. A packaging box in which the acute angle side of the angle formed by the guide wire and the second direction is 30 to 70 degrees. The separation length between the pair of first breaking guide lines and the both end edges of the top wall portion along the first direction is 5 to 25% with respect to the distance between the end edges of the top wall portion. , The packaging box according to claim 1. The length of the first break guide line in the front wall portion and the back wall portion in the first direction is 15 to 40 with respect to the total length of the front wall portion or the back wall portion in the first direction. %, The packaging box according to claim 1 or 2. The flap includes an outer flap connected to each of the top wall portion and the bottom wall portion via a crease line.
The method according to any one of claims 1 to 3, wherein the maximum length of the outer flap in the second direction is the same as the separation length between the top wall portion and the bottom wall portion in the box body. Packaging box. A plurality of packaging boxes according to any one of claims 1 to 4 containing an object to be packaged are prepared, and an opening is formed by cutting off a portion of each of the plurality of packaging boxes surrounded by the break guide line. Further, a method of using a packaging box in which the plurality of packaging boxes having the openings formed are stacked in a predetermined number of stages and stored, distributed or displayed in the stacked state.

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