JP7444019B2 - packaging box blank sheet - Google Patents

Description

The present invention relates to a blank sheet for a packaging box.

Conventionally, in order to dispose of or recycle a packaging box after use, the packaging box is dismantled, folded into a flat shape to reduce bulk, and tied up with string, adhesive tape, or the like. However, the work of tying things up with strings, adhesive tapes, etc. is troublesome work for disposal workers, and during the recycling process, it is a hassle to remove the vinyl strings and adhesive tapes. As a solution to this problem, a blank sheet is known in which a locking mechanism for maintaining the folded state is formed on the blank sheet (for example, see Patent Documents 1 and 2).

Patent No. 4792283 Utility model registration No. 3190696

Incidentally, in some packaging boxes, an opening or the like is formed by separating one of the four side plates forming the body of the packaging box from the other three side plates. In such a packaging box, the remaining three side panels are folded into three to reduce bulk for disposal or recycling, but since the box is folded in three, there are multiple ways to fold it.
However, the locking mechanisms disclosed in Patent Documents 1 and 2 cannot accommodate such multiple folding methods.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a blank sheet for a packaging box that can be held flat in a plurality of ways when folded into three.

In order to solve the above problems, the packaging box blank sheet of the present invention is a packaging box comprising four side plates forming a cylindrical body and a flap connected to each of the four side plates. This is a blank sheet. The flaps connected to three consecutive side plates among the four side plates are provided with a connecting portion for maintaining the three side plates in a folded state. The connecting portion is formed on an engaging piece that can be bent out of plane and is formed on each of the three flaps on both sides of the three flaps lined up in the direction in which the side plates are connected, and on the central flap. , and an insertion portion through which both the engaging pieces can be inserted. Each of the engaging pieces has a maximum width portion. The maximum width part of one of the engagement pieces and the maximum width part of the other of the engagement pieces are, in the extending direction from one end to the other end in the direction orthogonal to the width direction of each of the engagement pieces , They are provided at mutually different positions. That is, when the three flaps are stacked, the maximum width part of one of the engagement pieces and the maximum width part of the other of the engagement pieces do not overlap, but are arranged at shifted positions. Therefore, the maximum width portion of one of the engagement pieces can be engaged with an opening edge of an opening formed by bending the other engagement piece, and the maximum width of the other engagement piece can be engaged with an opening edge of an opening formed by bending one of the engagement pieces.

In the packaging box blank sheet of the present invention, when a packaging box from which one of the side plates has been separated is dismantled and the remaining three side plates are folded into three, one engaging piece of the flap is directed toward the other engaging piece. and push it in. Then, the other engaging piece is pushed by the one engaging piece and bent out of plane, and the maximum width part of the one engaging piece engages with the open edge of the opening. Thereby, the three side plates folded into three can be held flat.
Here, there are multiple ways to fold the tri-fold, but since the maximum width portions of both engaging pieces are provided at different positions in the extending direction from one end to the other, Similarly, when a piece is pushed toward one of the engaging pieces, the other engaging piece is bent out of plane by the other engaging piece, and the other engaging piece is bent against the open opening edge. The widest part engages.
Note that the insertion portion allows the pushed engagement piece to be inserted from one side to the other, or from the other side to one side. This realizes a smooth pushing operation of both engaging pieces.

Further, the maximum width portion of one of the engagement pieces is located at the other end, and the maximum width portion of the other engagement piece is located at an intermediate portion in the extending direction from one end to the other end. It is preferable that you do so.

With this configuration, the positions of the maximum width portions of both engaging pieces can be reliably made different. In addition, even if the blank sheet is a thick cardboard sheet, the widest part of one engagement piece can easily reach and engage the opening edge of the other, ensuring the engagement action. can.

Moreover, it is preferable that the distance between the side edges of one of the engagement pieces increases from one end toward the maximum width portion of the other end.

With this configuration, when one engaging piece is bent, the opening edge that opens becomes narrower towards one end in a trapezoidal shape, so the widest part of the other engaging piece can be smoothly bent. can be engaged. Therefore, the engagement operation is easy to perform.

According to the blank sheet according to the present invention, it is possible to hold the blank sheet in a flat shape in accordance with a plurality of ways of folding it into three at the time of disposal.

FIG. 2 is a plan view showing a blank sheet of a packaging box according to an embodiment of the present invention. It is a perspective view showing an example of how to fold up a blank sheet of a packaging box according to an embodiment of the present invention when discarding it. FIG. 3 is a perspective view showing a state in which the blank sheet of the packaging box according to the embodiment of the present invention is flattened in the folding method shown in FIG. 2; FIG. 4 is an enlarged plan view showing how the blank sheet of the packaging box according to the embodiment of the present invention engages when the engagement piece is pushed in from the state shown in FIG. 3; FIG. 7 is a perspective view showing another way of folding the blank sheet of the packaging box according to the embodiment of the present invention when discarding it. FIG. 6 is a perspective view showing a state in which the blank sheet of the packaging box according to the embodiment of the present invention is flattened in the folding method shown in FIG. 5; FIG. 7 is an enlarged plan view showing how the blank sheet of the packaging box according to the embodiment of the present invention engages when the engagement piece is pushed in from the state shown in FIG. 6 . FIG. 7 is a perspective view showing another way of folding the blank sheet of the packaging box according to the embodiment of the present invention when discarding it.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the front, back, left, right, top and bottom directions are set for convenience in explaining the blank sheet of the packaging box, and do not limit the configuration or usage condition of the blank sheet of the packaging box. Further, a blank sheet for forming a wrap-around packaging box will be described below.

A blank sheet (hereinafter referred to as "blank sheet") S of a packaging box shown in FIG. 1 is formed by die-cutting a sheet made of cardboard. The blank sheet S shown in FIG. 1 is arranged so that the inner surface side is visible.

Each ruled line (fold line) of the blank sheet S is a linear groove (pressed line) formed by pressing the surface of the blank sheet S. Note that cuts may be formed in the ruled lines. This makes it easier to fold the blank sheet S along the ruled lines.

The blank sheet S includes four rectangular side plates 11 to 14 defined by bending guide lines. That is, the side plate 12 is connected to the right edge of the leftmost side plate 11 via the ruled line, the side plate 13 is connected to the right edge of the side plate 12 via the ruled line, and the right edge of the side plate 13 A side plate 14 is connected to the side plate 14 via ruled lines. Among the four side plates 11 to 14 arranged in series in one direction, a joining piece 15 is arranged in series on the left edge of the leftmost side plate 11 via a ruled line. On the left and right ruled lines of the side plate 11, break guide lines L11, L11, which are perforation-like cuts, are formed. Note that the side plates 11 and 13 are formed to be somewhat wider in the left-right direction than the side plates 12 and 14.

By bending the blank sheet S along each ruled line and joining the joining piece 15 of the side plate 11 to the outer surface of the upper part of the side plate 14, a rectangular cylindrical body made of the four side plates 11 to 14 is formed. The side plate 11 constitutes the top wall of the packaging box, and the side plate 13 similarly constitutes the bottom wall. Further, the side plates 12 and 14 constitute both side walls that connect the top wall and the bottom wall of the packaging box. The side plate 11 serving as the top wall can be separated from the packaging box via the break guide lines L11, L11, and can be used as an opening.

A pair of upper and lower flaps 21, 21-24, 24 are formed on the upper and lower edges of the side plates 11-14, respectively, with ruled lines interposed therebetween. The upper flaps 21 to 24 are arranged at intervals in the direction in which the side plates 11 to 14 are connected. The same applies to the lower flaps 21-24. The pair of upper and lower flaps 21, 21 to 24, 24 are stacked on top of each other at the front and back of the body when the packaging box is formed, and are adhered with adhesive or the like to form the front end wall and rear end wall of the packaging box. .

Cut lines L26, L26 that form hand holes 25, 25 are formed in the flaps 21, 21 which are connected to the side plate 11 (the side plate connected to the joint piece 15). Further, the flaps 22, 22 of the side plate 12 and the flaps 24, 24 of the side plate 14 have cut pieces 27b defined by arc-shaped cuts 27c at positions corresponding to the hand holes 25, 25 of the flaps 21, 21. each formed. Each cut piece 27b is cut open by fingers inserted into the hand holes 25, 25, respectively.

Among the flaps 22 to 24 connected to the upper side of the three consecutive side plates 12 to 14, the flap 22 connected to the upper side of the side plate 12 has an engagement section defined by a concave break guiding line L32. A piece 32 is formed.
Furthermore, among the flaps 22 to 24 that are connected to the upper side of the three consecutive side plates 12 to 14, the flap 24 that is connected to the upper side of the side plate 14 is divided by a concave break guiding line L34. An engagement piece 34 is formed. Note that the flaps 22 and 24 are located at both ends of the three upper flaps 22 to 24 arranged in the direction in which the side plates 12 to 14 are connected.

Furthermore, among the flaps 22 to 24 which are connected to the upper side of the three consecutive side plates 12 to 14, the flap 23 which is connected to the upper side of the side plate 13 is divided by a concave break guiding line L33. An insertion piece 33 is formed as an insertion portion. Note that the flap 23 is located at the center of the three upper flaps 22 to 24 arranged in the direction in which the side plates 12 to 14 are connected.

As will be described later, the engaging pieces 32, 34 and the insertion piece 33 function as connecting parts to maintain the folded state, and when the packaging box is disassembled and disposed of, the body is folded into three. and are placed in positions that overlap each other.

One end of the engagement piece 32 is connected to the upper flap 21 via a ruled line L32a. The engagement piece 32 extends from one end that is the proximal end side (ruled line L32a side) to the other end that is the distal end side of the flap 21, and the side edges 32b, 32b extend from one end to the other end. It has a shape that spreads out like a letter. As a result, in the engagement piece 32, the maximum width portion 32c having the maximum width in the left-right direction is located at the other end (on the side opposite the ruled line L32a).

One end of the engagement piece 34 is connected to the upper flap 24 via a ruled line L34a. The engagement piece 34 extends from one end on the proximal side (ruled line L34a side) toward the other end on the distal end side of the flap 24. The engagement piece 34 has a substantially hexagonal shape in a plan view, and a maximum width portion 34c having the maximum width in the left-right direction is located at an intermediate portion in the extending direction from one end to the other end. In this embodiment, the maximum width portion 34c is formed at a position slightly shifted toward one end from the center portion in the extending direction from one end to the other end. Since the engagement piece 34 has a substantially hexagonal shape in plan view, the side edges 34b, 34b are tapered in a V-shape toward one end and the other end with the maximum width portion 34c in between. The maximum width portion 34c is set to be approximately the same size as the maximum width portion 32c of the engagement piece 32.

One end of the insertion piece 33 is connected to the upper flap 23 via a ruled line L33a. The insertion piece 33 extends from one end on the proximal end side (ruled line L33a side) toward the other end on the distal end side of the flap 23. The insertion piece 33 has a substantially square shape in plan view. The width of the insertion piece 33 in the left-right direction is approximately the same as or larger than the maximum width portion 32c and the maximum width portion 34c.

Next, a description will be given of the operation when the packaging box from which the side plate 11 (top wall) has been separated by opening is dismantled and the remaining three side plates 12 to 14 are folded.
The folding method shown in FIGS. 2 and 3 is a folding method in which the side plate 14 is placed at the bottom, the side plate 13 is folded on top of it, and the side plate 12 is further folded on top of that, and is folded in a substantially Z-shape. It is folded into three.

When folded in three in this way, as shown in FIG. The pieces 34 will be in an overlapping state. From this state, as shown in FIG. 3, when the uppermost engagement piece 32 is pushed downward, the insertion piece 33 below it is pushed by the engagement piece 32 and bent downward, and the insertion piece is further bent. 33, the engaging piece 34 below it is bent downward.

As the lowermost engagement piece 34 bends downward (moves out of the plane of the flap 24), as shown in FIG. An opening 341 is formed. Thereafter, when the uppermost engagement piece 32 is pushed further, the uppermost engagement piece 32 is pushed out below the lower surface of the flap 24 through the opening 341. In this case, by utilizing the flexibility of the cardboard, the maximum width part 32c of the engagement piece 32 is also pushed out below the lower surface of the flap 24, and the maximum width part 32c of the engagement piece 32 is pushed out below the lower surface of the flap 24, and The wide portion 32c becomes engaged.
After engagement, the width of the opening edges 342, 342 at the other end of the opening 341 is narrow relative to the maximum width portion 32c of the uppermost engagement piece 32. The engagement piece 32 is difficult to come off, and the engaged state is suitably maintained.

The opening 331 formed in the flap 23 by bending the insertion piece 33 downward functions as an insertion hole through which the uppermost engagement piece 32 is inserted, and the bent insertion piece 33 It functions as a pressing piece that makes surface contact with the lower engaging piece 34 and presses the engaging piece 34.

The folding method shown in FIGS. 5 and 6 is a folding method in which the side plate 12 is placed at the bottom, the side plate 13 is folded on top of it, and the side plate 14 is further folded on top of that, and is folded in a substantially Z-shape. It is folded into three. The folding method shown in FIGS. 5 and 6 differs from the folding method shown in FIGS. 2 and 3 in that the engaging piece 34 of the flap 24 is located at the top.

When folded in three in this way, the insertion piece 33 overlaps under the uppermost engagement piece 34, and the engagement piece 32 overlaps further below that. When the uppermost engagement piece 34 is pushed downward from this state, the insertion piece 33 below it is pushed by the engagement piece 34 and bent downward, and further pushed by the bent insertion piece 33 and the insertion piece 33 below it is pushed down. The engaging piece 32 is bent downward.

As the lowermost engagement piece 32 bends downward (moves out of the plane of the flap 22), as shown in FIG. An opening 321 is formed. Thereafter, when the uppermost engagement piece 34 is pushed further, the uppermost engagement piece 34 is pushed out below the lower surface of the flap 22 through the opening 321. In this case, by utilizing the flexibility of the cardboard, the maximum width portion 34c of the engagement piece 34 is also pushed out below the lower surface of the flap 22, and is pushed out against the opening edges 322, 322 at the approximate center of the opening 321. The maximum width portion 34c is in an engaged state.
After engagement, the width of the opening edges 322, 322 at the center of the opening 321 is narrow relative to the maximum width part 34c of the uppermost engagement piece 34, so The engaging piece 34 is difficult to come off, and the engaged state is suitably maintained.

In addition, even in this folding method, the opening 331 formed in the flap 23 by bending the insertion piece 33 downward functions as an insertion hole through which the uppermost engagement piece 34 is inserted. The piece 33 functions as a pressing piece that makes surface contact with the lowermost engaging piece 32 and presses the engaging piece 32.

The folding method shown in FIG. 8 is a folding method in which the side plate 12 and the side plate 14 are folded on top of the side plate 13 from both sides. In this case, there are two folding methods: one is to fold the side plates 12 and 14 in order onto the side plate 13, and the other is to fold the side plates 14 and 12 in order onto the side plate 13. be.

When folding the side plate 12 and the side plate 14 in order on the side plate 13, the engagement piece 34 of the flap 24 is located at the top, the engagement piece 32 of the flap 22 is placed below it, and the engagement piece 32 of the flap 22 is placed below it. The insertion pieces 33 of the flaps 23 overlap. From this state, when the uppermost engagement piece 34 is pushed downward, the engagement piece 32 below it is pushed by the engagement piece 34 and bent downward, and is further pushed by the bent engagement piece 32. The insertion piece 33 below is bent downward.

By bending the middle engagement piece 32 downward (by moving out of the plane of the flap 22), an opening 321 is formed in the flap 22, as in the case shown in FIG. The uppermost engagement piece 34 is pushed out below the lower surface of the flap 22. This brings the maximum width portion 34c into engagement with the opening edges 322, 322 at the other end of the opening 321.
In this case as well, after engagement, the opening edges 322, 322 at the center of the opening 321 are narrow relative to the maximum width portion 34c of the uppermost engagement piece 34. , the engagement piece 34 is difficult to come off from the opening 321, and the engaged state is suitably maintained.

Note that the insertion piece 33 forms an opening 331 that becomes a relief part when the uppermost engagement piece 34 and the middle engagement piece 32 are pushed downward.

On the other hand, when folding the side plate 14 and the side plate 12 over the side plate 13 in order, the engagement piece 32 of the flap 22 is located at the top, the engagement piece 34 of the flap 24 is overlapped below, and then The insertion piece 33 of the flap 23 is placed under it. When the top engagement piece 32 is pushed downward from this state, the engagement piece 34 below it is pushed by the engagement piece 32 and bent downward, and is further pushed by the bent engagement piece 34. The insertion piece 33 below is bent downward.

When the middle engagement piece 34 bends downward (moves out of the plane of the flap 24), an opening 341 is formed in the flap 24, as in the case shown in FIG. The uppermost engagement piece 32 is pushed out below the lower surface of the flap 24. As a result, the maximum width portion 32c is brought into engagement with the opening edges 342, 342 at the other end of the opening 341.
In this case as well, after engagement, the opening edges 342, 342 at the other end of the opening 341 are narrow relative to the maximum width portion 32c of the uppermost engagement piece 32. , the engagement piece 32 is difficult to come off from the opening 341, and the engaged state is suitably maintained.

In this case as well, the insertion piece 33 forms an opening 331 that becomes a relief part when the uppermost engagement piece 32 and the middle engagement piece 34 are pushed downward. do.

According to the blank sheet S of this embodiment described above, when folding the side plates 12 to 14 into three, the maximum width portion 32c of one engagement piece 32 is aligned with the opening edge 342, 342 of the other engagement piece 34. can be engaged. Conversely, the maximum width portion 34c of the other engaging piece 34 can be engaged with the opening edges 322, 322 of one engaging piece 32. Thereby, the three side plates 12 to 14 folded into three can be held flat.

Further, since the maximum width portions 32c and 34c of both the engagement pieces 32 and 34 are provided at different positions in the extending direction from one end to the other, one engagement piece 32 can be connected to the other engagement piece. In either case, when pushing the engagement piece 34 towards the engagement piece 34 or pushing the other engagement piece 34 towards the engagement piece 32, the engagement between the maximum width parts 32c and 34c is utilized. The three side plates 12 to 14 folded into three can be held flat.

Moreover, the insertion piece 33 is such that one of the pushed-in engagement pieces 32 is inserted toward the other engagement piece 34 , or the other engagement piece 34 is inserted toward one of the engagement pieces 32 . Therefore, smooth pushing operation of both the engaging pieces 32 and 34 is realized.

Further, one engagement piece 32 has a maximum width portion 32c located at the other end, and the other engagement piece 34 has a maximum width portion 34c located at an intermediate portion in the extending direction from one end to the other end. Therefore, the positions of the maximum width portions 32c and 34c can be reliably made different. Further, even if the blank sheet S is made of thick cardboard, the maximum width portion 32c of one engagement piece 32 easily reaches the other opening edge 342, 342; Since the maximum width portion 34c of the mating piece 34 can easily reach one of the opening edges 322, 322, and is in a state where it is easy to engage, the engagement action can be ensured.

In addition, one of the engagement pieces 32 has a side edge 32b that widens in a V-shape from one end to a maximum width portion 32c at the other end, and opening edges 322, 322 that extend toward one end in a V-shape (trapezoidal shape). ), the maximum width portion 34c of the other engagement piece 34 can be engaged smoothly. Therefore, the engagement operation is easy to perform.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit thereof.
For example, the positions of the maximum width parts 32c, 34c of the engagement pieces 32, 34 may be at different positions in the vertical direction from one end to the other, and are not limited to the other end or the center.

Further, the shapes of the maximum width portions 32c and 34c are not limited to those in the embodiment, and various shapes may be adopted.

Further, although the engaging pieces 32, 34 and the insertion piece 33 are shown as extending from one end to the other end, they are not limited to this, and may extend from the other end to one end. , may extend in the left-right direction. In this case as well, similar effects can be achieved.

Further, although the engaging pieces 32, 34 and the insertion piece 33 are provided on the adjacent side plates 12 to 14, they are not limited to this, and may be provided on any three adjacent side plates.
Further, although an example has been shown in which the side plate 12 is provided with the engagement piece 32 and the side plate 14 is provided with the engagement piece 34, these are replaced, and the side plate 12 is provided with the engagement piece 34, and the side plate 14 is provided with the engagement piece 32. may be provided. In this case as well, similar effects can be achieved.

Further, although the opening 331 is formed by bending the insertion piece 33, the present invention is not limited to this, and the opening 331 may be formed by cutting the insertion piece 33, or The structure may be such that the holes are open from the beginning (punched holes).
Note that by configuring the opening 331 to be closed by the insertion piece 33 as in this embodiment, it is possible to prevent foreign matter from entering the inside of the packaging box.

Further, the lower engaging piece 34 may be pushed in from below in the folded state shown in FIG. 3, or the lower engaging piece 32 may be pushed in from below in the folded state shown in FIG. In these cases as well, a similar engagement state is obtained, and the folded state is suitably maintained by the same effects.

In addition, in the embodiment, a blank sheet S for forming a wrap-around packaging box has been described, but the present invention is not limited to this, and the packaging box is an A-type packaging box in which the top wall and the bottom wall are configured with flaps. The present invention can also be applied to blank sheets for forming.

Furthermore, characters or symbols representing the pushing operation may be marked on both the engaging pieces 32, 34 or in the vicinity of both the engaging pieces 32, 34.

Although the blank sheet S of this embodiment is made of corrugated cardboard, the blank sheet may be formed of various known paperboards.

11 Side plate 12 Side plate 13 Side plate 14 Side plate 21 Flap 22 Flap 23 Flap 24 Flap 32 Engagement piece 32c Maximum width part 33 Insertion piece (insertion part)
34 Engagement piece 34c Maximum width part L26 Cut line L32 Break guide line L33 Break guide line L34 Break guide line S Blank sheet

Claims (3)

A blank sheet for a packaging box, comprising four side plates forming a cylindrical body, and flaps connected to each of the four side plates,
Of the four side plates, the flaps of three consecutive side plates are provided with connecting portions for maintaining the three side plates in a folded state,
The connecting portion is
Of the three flaps arranged in the direction in which the side plates are connected, an engaging piece that can be bent out of plane is formed on each of the flaps on both sides, and an engaging piece that is formed on the central flap and that can be bent out of the plane. It is equipped with an insertion part through which the piece can be inserted,
Each of the engagement pieces has a maximum width portion,
The maximum width part of one of the engagement pieces and the maximum width part of the other of the engagement pieces are, in the extending direction from one end to the other end in the direction orthogonal to the width direction of each of the engagement pieces , A packaging box blank sheet characterized by being provided at mutually different positions. One of the engagement pieces has the maximum width portion located at the other end,
2. The blank sheet for a packaging box according to claim 1, wherein the maximum width portion of the other engaging piece is located at an intermediate portion in an extending direction from one end to the other end. A blank sheet for a packaging box according to claim 1 or 2, wherein one of the engagement pieces has a side edge that widens in a V-shape from one end to the maximum width portion at the other end. .

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