JP2024031679A - packaging box - Google Patents

Abstract

An object of the present invention is to provide a packaging box that can reduce the intrusion of foreign matter into the packaging box and that can be assembled reliably. The packaging boxes 10, 20, and 30 are rectangular parallelepiped wraparound case types. The pair of outer flaps 18, 28, and 38 face each other with their leading edges separated by a predetermined distance. The tips of the left inner flaps 17L, 27L, and 37L overlap the outer surfaces of the right inner flaps 17R, 27R, and 37R in regions sandwiched between the tip edges of at least a pair of outer flaps 18, 28, and 38. The outer flap 18 or the right inner flap 27R, 37R has approach fold lines b, i, i' that bend themselves to approach each other. [Selection diagram] Figure 1

Description

The present invention relates to a wrap-around case type packaging box.

Conventionally, a rectangular parallelepiped wraparound case type packaging box that can accommodate a plurality of products is known (see Patent Document 1).

This packaging box has a rectangular cylindrical body extending in the horizontal direction, and a pair of closing parts that respectively close open ends of the body. This body is assembled by sequentially folding a top plate, a bottom plate, and a pair of side plates that are connected to each other along the body crease line, and the closing portion is attached to each of the pair of side plates. A pair of connected inner flaps and a pair of outer flaps connected to the top plate and the bottom plate are all folded inward along the inner flap fold line and the outer flap fold line, and the outer flap is attached to the outer surface of the inner flap. It can be assembled by fixing it with adhesive.

JP 2015-742 Publication

However, this packaging box has a problem in that if there is a gap between the pair of inner flaps and between the pair of outer flaps in the assembled state, foreign matter may get mixed in through the gap.

To solve this problem, it is possible to eliminate the above-mentioned gap by abutting the leading edges of the opposing flaps against each other. However, since there is a considerable amount of error in the position at which the corrugated cardboard is folded, it is difficult to maintain the precision of matching the leading edges of opposing flaps without any gaps in packaging boxes that are produced in large quantities.

On the other hand, to solve the problem, it is conceivable to overlap the leading ends of the opposing flaps. However, when the flaps overlap each other, a difference in level occurs, so there is a new problem that the inner flap and outer flap cannot be sufficiently pressed together with adhesive, resulting in a weak fixing force.

The present invention has been made to solve these problems, and aims to provide a packaging box that can reduce the amount of foreign matter entering the packaging box and that can be assembled reliably. purpose.

In order to achieve such an object, a first packaging box of the present invention is a packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body, The trunk is configured by a top plate, a bottom plate, and a pair of side wall plates connected to each other via a trunk fold line, and the closing part is connected to the pair of side wall plates via an inner flap fold line. a pair of inner flaps, and a pair of outer flaps that are connected to the top plate and the bottom plate via outer flap fold lines and fixed to the outer surface of the inner flap, and the pair of outer flaps are , the distal edges of each inner flap face each other with a predetermined interval, and the distal end of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the distal edges of at least a pair of outer flaps, The outer flap or the other inner flap is characterized in that it has an approach fold line that bends itself to approach each other.

In the first packaging box of the present invention, the leading edges of the pair of outer flaps face each other with a predetermined interval, and the leading edge of one of the inner flaps is sandwiched between the leading edges of at least one pair of outer flaps. in the area overlapping the outer surface of the other inner flap.

Therefore, according to the first packaging box of the present invention, the gap between the tip edges of the pair of outer flaps is filled by the tip of one inner flap overlapping the outer surface of the other inner flap, and the packaging box is Since the gap communicating from the outside to the inside can be reduced, it is possible to prevent foreign matter from entering the inside of the packaging box.

Further, in the first packaging box of the present invention, one inner flap is overlapped with the outer surface of the other inner flap, thereby creating a step. Since the outer flap is overlapped with the outer surface of these inner flaps, as a result, one inner flap on the upper side tends to come into contact with the outer flap, but the other inner flap on the lower side is easily touched by one inner flap. Since it is pushed into the inner space of the packaging box, it tends to be difficult to contact the outer flap.

However, in the first packaging box of the present invention, since the outer flap or the other inner flap has a close fold line, by bending itself (the outer flap or the other inner flap) at the close fold line, the outer flap and the other inner flap are bent. The inner flap can be brought closer to the inner flap.

Therefore, according to the first packaging box of the present invention, since the inner flap and the outer flap can be sufficiently crimped with adhesive, assembly can be performed reliably.

A second packaging box of the present invention is a packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body, the body having a top plate, a bottom plate, and a bottom plate. and a pair of side wall plates connected to each other via a trunk fold line, and the closing portion includes a pair of inner flaps connected to the pair of side wall plates via an inner flap fold line; The top plate and the bottom plate have a pair of outer flaps that are connected to the outer flap fold line and are fixed to the outer surface of the inner flap, and the pair of outer flaps have tip edges of each other in a predetermined shape. The distal end portion of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the distal edges of at least one pair of outer flaps, and the outer flap fold line is It is characterized in that both corners of the outer flap on the base end side are connected and are formed in a convex shape in a direction away from the tip of the outer flap.

In the second packaging box of the present invention, the leading edges of the pair of outer flaps face each other with a predetermined interval, and the leading edge of one of the inner flaps is sandwiched between the leading edges of at least one pair of outer flaps. in the area overlapping the outer surface of the other inner flap.

Therefore, according to the second packaging box of the present invention, the gap between the tip edges of the pair of outer flaps is filled by the tip of one inner flap overlapping the outer surface of the other inner flap, and the packaging box is Since the gap communicating from the outside to the inside can be reduced, it is possible to prevent foreign matter from entering the inside of the packaging box.

Moreover, in the second packaging box of the present invention, one inner flap is overlapped with the outer surface of the other inner flap, thereby creating a step. Since the outer flap is overlapped with the outer surface of these inner flaps, as a result, one of the inner flaps easily comes into contact with the outer flap, but the other inner flap is closed to the inner space of the packaging box by one inner flap. Since it is pushed to the side, it tends to be difficult to contact the outer flap.

However, in the second packaging box of the present invention, the outer flap connects both corner portions on the proximal end side, and the outer flap fold line is formed in a convex shape in a direction away from the tip of the outer flap. It is connected to the body (top plate and bottom plate).

Therefore, when the outer flap is folded along the fold line, the center portion of the outer flap in the width direction is bent so as to protrude toward the inner space of the packaging box. Thereby, the outer flap can also approach the other inner flap that is pushed downward (towards the inner space of the packaging box) by one inner flap.

Therefore, according to the second packaging box of the present invention, it is easy to press the inner flap and the outer flap with adhesive, so that assembly can be performed reliably.

In the second packaging box of the present invention, the outer flap fold line is formed in a V-shape in which two straight parts are connected by a bent part, and the outer flap is extended from the bent part to the tip edge of the outer flap. It is preferred to have an outer flap valley fold line that extends to the middle.

According to the second packaging box of the present invention having this configuration, when the outer flap is folded along the V-shaped flap crease line and the outer flap valley fold line, the outer flap is valley-folded along the outer flap valley fold line, It is bent into a substantially V-shape toward the interior space of the packaging box. As a result, the outer flap approaches the other inner flap that is pushed downward (towards the inner space of the packaging box) by one inner flap.

Therefore, according to the second packaging box of the present invention having this configuration, the inner flap and the outer flap can be easily crimped with adhesive, so that assembly can be performed reliably.

Furthermore, in the second packaging box of the present invention having the above configuration (V-shaped outer flap fold line and outer flap valley fold line), from the outer flap valley fold line of the outer flap to the base end of the one inner flap. The distance is preferably the same as or greater than the distance from the proximal end to the distal end of the one inner flap.

In the second packaging box of the present invention having this configuration, the portion of the outer flap that is bent in a V-shape and extends along the valley fold line of the outer flap that protrudes furthest toward the inner space of the packaging box is one of the inner flaps. It is arranged closer to the other inner flap than the other flap.

Therefore, according to the second packaging box of the present invention having this configuration, the outer flap can be reliably brought close to the other inner flap. Therefore, according to the second packaging box of the present invention having this configuration, it is easy to press the inner flap and the outer flap together with an adhesive, so that assembly can be performed reliably.

A third packaging box of the present invention is a packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body, the body having a top plate, a bottom plate, and a bottom plate. and a pair of side wall plates connected to each other via a trunk fold line, and the closing portion includes a pair of inner flaps connected to the pair of side wall plates via an inner flap fold line; The top plate and the bottom plate have a pair of outer flaps that are connected to the outer flap fold line and are fixed to the outer surface of the inner flap, and the pair of outer flaps have tip edges of each other in a predetermined shape. The distal end portion of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the distal edges of at least one pair of outer flaps, and the other inner flap It is characterized by having an inner flap mountain fold line connecting both side edges of the other inner flap on the distal side of the inner flap fold line.

In the third packaging box of the present invention, the leading edges of the pair of outer flaps face each other with a predetermined interval, and the leading edge of one of the inner flaps is sandwiched between the leading edges of at least one pair of outer flaps. in the area overlapping the outer surface of the other inner flap.

Therefore, according to the third packaging box of the present invention, the gap between the tip edges of the pair of outer flaps is filled by the tip of one inner flap overlapping the outer surface of the other inner flap, and the packaging box is Since the gap communicating from the outside to the inside can be reduced, it is possible to prevent foreign matter from entering the inside of the packaging box.

Furthermore, in the third packaging box of the present invention, one inner flap is overlapped with the outer surface of the other inner flap, resulting in a step. Since the outer flap is overlapped with the outer surface of these inner flaps, as a result, one of the inner flaps easily comes into contact with the outer flap, but the other inner flap is closed to the inner space of the packaging box by one inner flap. Since it is pushed to the side, it tends to be difficult to contact the outer flap.

However, in the third packaging box of the present invention, the other inner flap has an inner flap mountain fold line that connects both side edges of the other inner flap on the tip side of the inner flap fold line.

Therefore, by mountain-folding the other inner flap along the inner flap mountain fold line, the other inner flap can be bent so as to project toward the external space of the packaging box with the inner flap mountain fold line serving as a ridgeline. As a result, even if the tip end side of one inner flap is pushed downward (towards the inner space of the packaging box), the portion of the other inner flap along the inner flap mountain fold line can be brought close to the outer flap.

Therefore, according to the third packaging box of the present invention, it is easy to press the inner flap and the outer flap with adhesive, so that assembly can be performed reliably.

In the third packaging box of the present invention, the inner flap fold line provided along the base end of the other inner flap connects both corners on the base end side of the other inner flap, and It is formed in an arc shape that swells in a direction away from the tip of the inner flap, and the inner flap mountain fold line connects both corners on the base end side of the other inner flap and extends in a direction approaching the tip of the other inner flap. Preferably, it is formed into a bulging arc shape.

In the third packaging box of the present invention having this configuration, since both ends of the inner flap fold line and the inner flap mountain fold line are common, it is only necessary to fold the other inner flap toward the inside of the packaging box. , the other inner flap is sequentially bent along the inner flap fold line and the inner flap peak fold line.

Further, both the inner flap fold line and the inner flap mountain fold line are arcuate. When bending along an arcuate crease line, it is not natural to bend the box, and it is necessary to force the bend slightly while allowing the entire packaging box to bend. Therefore, even if the other inner flap is bent at the inner flap fold line and the inner flap mountain fold line, a strong restoring force is generated to return the other inner flap to its original state (attitude along the trunk). Therefore, when the outer surface of the tip of the other inner flap is pressed against the other inner flap, its restoring force causes the entire area other than the tip (including the part along the inner flap mountain fold line) to move to the outside of the packaging box. It repulses as it tries to protrude into space.

Therefore, according to the third packaging box of the present invention having this configuration, when the outer flap with adhesive is pressed down from the outside, the other inner flap tries to resist this due to the restoring force. The inner flap and outer flap can be easily crimped with adhesive. Therefore, according to the third packaging box of the present invention having this configuration, assembly can be performed reliably.

In the third packaging box of the present invention, the inner flap fold line provided along the base end of the other inner flap is the inner flap fold line provided along the base end of the one inner flap. It is preferable that the inner flap mountain fold line is formed in a straight line so as to be paired with the other inner flap, and that the inner flap mountain fold line is formed in a straight line connecting the intermediate portions of both side edges of the other inner flap.

According to the third packaging box of the present invention having this configuration, the other inner flap is folded so as to be on the same plane as the one inner flap by the inner flap crease line provided along the base end of the other inner flap. At the same time, the tip of the other inner flap is folded in a mountain along the inner flap mountain fold line, and is stacked on the inner surface side of one of the inner flaps.

At this time, since the inner flap crease line and the inner flap peak fold line of the other inner flap are straight, the other inner flap does not curve, so it is sandwiched between the inner flap crease line and the inner flap peak fold line. The region can be disposed coplanar with one inner flap. Therefore, a region of the other inner flap sandwiched between the inner flap fold line and the inner flap mountain fold line can be bonded surface to surface to the outer flap.

Therefore, according to the third packaging box of the present invention having this configuration, it is easy to press the inner flap and the outer flap together with an adhesive, so that assembly can be performed reliably.

FIG. 2 is a perspective view showing the appearance of a packaging box according to the first embodiment. FIG. 2 is a plan view showing the configuration of the packaging box according to the first embodiment before assembly. 2 is an end view showing the end surface taken along the line AA in FIG. 1. FIG. FIG. 7 is a perspective view showing the appearance of a packaging box according to a second embodiment. It is a top view which shows the structure before assembly of the packaging box based on 2nd Embodiment. 5 is an end view showing the end surface taken along line BB in FIG. 4. FIG. It is a top view which shows the structure before assembly of the packaging box based on 3rd Embodiment. 5 is an end view showing the end surface of the third embodiment when cut at the same position as the line BB in FIG. 4. FIG.

[First embodiment]
A packaging box 10 according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that the packaging box 10 according to the first embodiment corresponds to the first packaging box of the present invention and the second packaging box of the present invention described in the means for solving the problems.

As shown in FIG. 1, the packaging box 10 of the first embodiment is a wraparound case type with a rectangular parallelepiped appearance. The packaging box 10 has a rectangular cylindrical body 12 extending in the horizontal direction, and a closing part 13 that closes the open end of the body 12. The packaging box 10 of the first embodiment is formed into a vertically elongated shape in which the height (length in the vertical direction) is longer than the width (length in the horizontal direction) when viewed from the side of the closure part 13.

The body 12 includes a top plate 14, a bottom plate 15, and a pair of side plates 16. The pair of side plates 16 include a left side plate 16L on the back side (left side) and a right side plate 16R on the near side (right side) in FIG.

The closing portion 13 includes an inner flap 17 and a pair of outer flaps 18.

The pair of inner flaps 17 include a left inner flap 17L (corresponding to "one inner flap" of the present invention) which is connected to the left side plate 16L, and a right inner flap 17R (which corresponds to "one inner flap" of the present invention) which is connected to the right side plate 16R. This corresponds to the "other inner flap" of the present invention. In FIG. 1, the tip of the left inner flap 17L overlaps the outer surface of the right inner flap 17R.

The pair of outer flaps 18 face each other with their distal edges separated by a predetermined distance. An outer flap valley fold line c connecting the upper and lower ends is formed in the widthwise central part of the outer flap 18, and the outer flap 18 is valley folded along the outer flap valley fold line c to open the inner space of the packaging box in a plan view. It is bent into a V-shape.

Further, the outer flap 18 is fixed to the outer surface of the inner flap 17 (left inner flap 17L and right inner flap 17R) via an adhesive G, respectively.

The packaging box 10 is assembled by punching out a substantially rectangular corrugated paperboard 10x shown in FIG. 2 from base paper, and then folding it. Hereinafter, the structure of the corrugated paperboard 10x will be explained with reference to FIG. 2.

As shown in FIG. 2, the corrugated paperboard 10x includes a left side plate 16L, a bottom plate 15, a right side plate 16R, a top plate 14, and an adhesive piece 19, which are connected in this order from the left side through the trunk crease line a. . The top plate 14, the bottom plate 15, the left side plate 16L, and the right side plate 16R are all formed in a substantially rectangular shape, and the adhesive piece 19 is formed in a substantially inverted trapezoid shape.

The top plate 14 has an outer flap fold line b (corresponding to the "outer flap fold line" of the second packaging box of the present invention) and an "approximate fold line b" of the first packaging box of the present invention at its upper and lower ends. ).The outer flaps 18 are connected to each other via the outer flaps. Each of the outer flaps 18 is formed into a substantially pentagonal shape.

The outer flap fold line b is formed in a V-shape that protrudes toward the trunk 12 side from an extension line of the inner flap fold line d, which will be described later. More specifically, the outer flap fold line b is the outer flap left fold line b1 (corresponding to the "straight line" of the present invention) formed in a straight line on the right side in FIG. The outer flap right turn line b2 (corresponding to the "straight line part" of the present invention) formed in a straight line is connected at a bent part 18a to form a V-shape. The outer flap left turn line b1 is designed to be longer than the outer flap right turn line b2.

Further, the outer flap 18 is formed with an outer flap valley fold line c extending along the trunk fold line a from the bent portion 18a to the intermediate portion of the leading edge thereof. The outer flap 18 is divided into a left outer flap half part 18L on the right side in FIG. 2 and a right outer flap half part 18R on the left side in FIG. 2 by the outer flap valley fold line c. The width of the left outer flap half 18L is designed to be longer than the width of the right outer flap half 18R. The width of this outer flap left half portion 18L is designed to be approximately the same length as the length from the base end to the tip end of the left inner flap 17L.

The bottom plate 15 has an outer flap fold line b (corresponding to the "outer flap fold line" of the second packaging box of the present invention) and an "approach fold line" of the first packaging box of the present invention at its upper and lower ends. The outer flaps 18 are connected to each other via the respective outer flaps (corresponding to the above). Each of the outer flaps 18 is formed into a substantially pentagonal shape. The total length from the base end to the tip of the pair of outer flaps 18 is designed to be smaller than the length in the width direction (horizontal direction in FIG. 2) of the inner flap 17 (left inner flap 17L and right inner flap 17R). has been done.

The outer flap fold line b is formed in a V-shape that protrudes toward the trunk 12 side from an extension line of the inner flap fold line d, which will be described later. More specifically, the outer flap fold line b is the outer flap left fold line b1 (corresponding to the "straight line part" of the present invention) formed in a straight line on the left side in FIG. The outer flap right turn line b2 (corresponding to the "straight line part" of the present invention) formed in a straight line is connected at a bent part 18a to form a V-shape. The outer flap left turn line b1 is designed to be longer than the outer flap right turn line b2.

Further, the outer flap 18 is formed with an outer flap valley fold line c extending in parallel along the body fold line a from the bent portion 18a to the intermediate portion of the tip edge thereof. The outer flap 18 is divided into a left outer flap half part 18L on the right side in FIG. 2 and a right outer flap half part 18R on the left side in FIG. 2 by the outer flap valley fold line c. The width of the left outer flap half 18L is designed to be longer than the width of the right outer flap half 18R. The width of this outer flap left half portion 18L is designed to be approximately the same length as the length from the base end to the tip end of the left inner flap 17L.

In FIG. 2, left inner flaps 17L are connected to the upper and lower ends of the left side plate 16L via inner flap fold lines d, respectively. The left inner flap 17L is formed into a substantially rectangular shape. Right inner flaps 17R are connected to the upper and lower ends of the right side plate 16R via inner flap fold lines d, respectively. The left inner flap 17R is formed in the same substantially rectangular shape as the left inner flap 17L.

The total length of the left inner flap 17L from the base end to the tip and the left inner flap 17R from the base end to the tip is greater than the width of the top plate 14 and the bottom plate 15 (or the outer flap 18). Designed.

Next, a procedure for assembling the packaging box 10 shown in FIG. 1 from the corrugated paperboard 10x shown in FIG. 2 will be described.

First, the corrugated paperboard 10x is placed on, for example, a stand (not shown) by an operator, and a plurality of products (not shown) are placed on the bottom plate 15 in a lined manner.

Next, in FIG. 2, the left side plate 16L disposed on the left side of the bottom plate 15 is bent along the trunk crease line a, and stands up at right angles to the bottom plate 15. Then, an adhesive G (not shown) is applied to the outer surface of the upper end of the left side plate 16L that has been erected.

Next, by sequentially bending the bottom plate 15 along the trunk crease line a located on the right side, the right side plate 16R is erected at right angles to the bottom plate 15, the top plate 14 is made parallel to the bottom plate 15, and the adhesive piece 19 is hanging down. Then, the inner surface of the adhesive piece 19 is fixed to the outer surface of the left side plate 16L via the adhesive G, so that the body portion 12 is assembled.

Next, the right inner flap 17R is bent toward the inside of the body 12 at a right angle to the right side plate 16R along the inner flap fold line d, and the left inner flap 17L is folded toward the inside of the body 12 at the inner flap fold line d. It is bent inward at right angles to the left side plate 16L.

At this time, the total length of the left inner flap 17L from the base end to the tip and the length of the left inner flap 17R from the base end to the tip is greater than the width of the top plate 14 and the bottom plate 15, so the left As shown in FIG. 3, the tip of the inner flap 17L is overlapped with the outer surface of the right inner flap 17R. As a result, in the closing portion 13 of the packaging box 10, the left inner flap 17L is overlapped with the outer surface of the right inner flap 17R, and the right inner flap 17R is pushed into the inner space of the packaging box 10, thereby creating a step.

Next, as shown in FIG. 1, adhesive G is applied to the outer surfaces of the left inner flap 17L and the right inner flap 17R at a position where the outer flap 18 is overlapped.

Next, as shown in FIG. 1, the lower outer flap 18 is bent upward along the outer flap fold line b, and the inner surface of the lower outer flap 18 is attached to the inner flap 7 (left inner flap) via the adhesive G. 17L and the right inner flap 17R), the upper outer flap 18 is bent downward along the outer flap crease line b, and the inner surface of the upper outer flap 18 is attached to the inner flap 7 (left It is fixed to the outer surface of the inner flap 17L and the right inner flap 17R).

At this time, the total length from the base end to the tip of the pair of outer flaps 18 is the length of the inner flap 17 (left inner flap 17L and right inner flap 17R) in the width direction (vertical direction in FIG. 1). Since the outer flaps 18 are designed to be smaller than each other, the leading edges of the pair of outer flaps 18 face each other with a predetermined distance therebetween. As a result, the open end of the body portion 12 is closed, and a closed portion 13 is formed.

Next, how the outer flap 18 is deformed when the outer flap 18 is bent along the outer flap fold line b will be supplementarily explained using FIG. 3.

First, since the outer flap fold line b is bent in a V-shape, when the outer flap 18 is folded along the outer flap fold line b, the center portion in the width direction faces the inner space of the packaging box 10 into a V shape. Bent to protrude into shape.

In particular, the outer flap 18 is formed with an outer flap valley fold line c extending in parallel along the body fold line a from the bent portion 18a arranged near the center in the width direction to the middle part of the tip edge of the outer flap 18. Therefore, the outer flap 18 is valley folded along the outer flap valley fold line c. Therefore, the outer flap 18 is easily bent into a V-shape toward the internal space of the packaging box 10.

By this valley fold, the outer flap 18 is valley folded along the outer flap valley fold line c, and is divided into a left outer flap left half portion 18L and a right outer flap right half portion 18R.

The width of this outer flap left half portion 18L is designed to be approximately the same length as the length from the base end to the tip of the left inner flap 17L disposed above. Substantially the entire area of the inner surface comes into surface-to-surface contact with substantially the entire area of the outer surface of the left inner flap 17L by slightly pushing the inner left flap 17L.

In addition, since the width of the outer flap left half portion 18L is designed to be approximately the same length as the length from the base end to the tip of the left inner flap 17L disposed above, the outer flap valley fold line c is It is arranged so as to be in contact with the tip edge of the left inner flap 17L. As a result, almost the entire inner surface of the right outer flap half 18R and most of the outer surface of the right inner flap 17R (excluding the tip hidden by the left inner flap 17L) are separated from each other by a surface. I am in contact with.

Through the above steps, the assembly of the packaging box 10 containing the product is completed, and the packaging box 10 in the state shown in FIG. 1 is completed.

Next, the functions and effects of the packaging box 10 of the first embodiment will be explained with reference to FIGS. 1 and 3.

In the packaging box 10 of the first embodiment, the entire tip of the left inner flap 17L overlaps the outer surface of the right inner flap 17R, so there is a gap between both tip edges of the pair of outer flaps 18. However, it is possible to eliminate the gap that occurs in the central portion of the closed portion 13 that communicates from the outside to the inside. Therefore, according to the packaging box 10 of the first embodiment, it is possible to suppress foreign matter from entering the inside of the packaging box 10.

Conversely, in the packaging box 10 of the first embodiment, the gap between the pair of outer flaps 18 can be filled by the overlap of the inner flaps 17, so even if the closing portion 13 has a vertically elongated shape, the outer flaps 18 can be made longer. It is not necessary to butt them together, and they can be shortened. Therefore, according to the packaging box 10 of the first embodiment, the area of the corrugated paperboard 10x can be reduced.

By the way, in the closing part 13 of the packaging box 10, a step is created because the left inner flap 17L is overlapped with the outer surface of the right inner flap 17R. As a result, the upper left inner flap 17L easily contacts the outer flap 18, but the lower right inner flap 17R is pushed into the inner space of the packaging box 10 by the left inner flap 17L, making it difficult to contact the outer flap 18. Cheap.

However, in the outer flap 18, since the outer flap fold line b is formed in a V-shape and the outer flap valley fold line c is formed, when the outer flap 18 is folded along the outer flap fold line b, the center portion in the width direction is bent so as to protrude into the internal space of the packaging box 10 in a V-shape.

Therefore, in the packaging box 10, by folding the outer flap 18 along the outer flap fold line b and the outer flap valley fold line c, the outer flap 18 can be bent not only to the upper left inner flap 17L but also to the lower right inner flap 17R. It can be brought closer.

In the packaging box 10, substantially the entire inner surface of the left outer flap half 18L and substantially the entire outer surface of the left inner flap 17L are in surface-to-plane contact, and the inner surface of the right outer flap half 18R Almost the entire area of the inner right flap 17R is in surface-to-plane contact with most of the outer surface of the inner right flap 17R (excluding the tip portion hidden by the inner left flap 17L).

Therefore, according to the packaging box 10 of the first embodiment, the inner left flap 17L and the inner right flap 17R and the outer flap 18 can be sufficiently crimped with the adhesive G, so that assembly can be performed reliably.

[Second embodiment]
A packaging box 20 according to a second embodiment of the present invention will be described below with reference to FIGS. 4 to 6. Note that the packaging box 20 according to the second embodiment corresponds to the first packaging box of the present invention and the third packaging box of the present invention described in the means for solving the problems.

As shown in FIG. 4, the packaging box 20 of the second embodiment is a wrap-around case type with a rectangular parallelepiped appearance. The packaging box 20 has a rectangular cylindrical body 22 extending in the horizontal direction, and a closing part 23 that closes the open end of the body 22. The packaging box 20 of the second embodiment is formed in a vertically elongated shape in which the height (length in the vertical direction) is longer than the width (length in the left-right direction) when viewed from the side of the closing part 23.

The body 22 includes a top plate 24, a bottom plate 25, and a pair of side plates 26. The pair of side plates 26 include a left side plate 26L on the back side (left side) and a right side plate 26R on the near side (right side) in FIG.

The closing portion 23 includes an inner flap 27 and a pair of outer flaps 28.

The pair of inner flaps 27 include a left inner flap 27L (corresponding to "one inner flap" of the present invention) connected to the left side plate 26L, and a right inner flap 27R (corresponding to "one inner flap" of the present invention) connected to the right side plate 26R. This corresponds to the "other inner flap" of the present invention. In FIG. 4, the tip of the left inner flap 27L overlaps the outer surface of the right inner flap 27R.

A leaf-shaped connecting portion 27a is formed at the base end of the right inner flap 27R. The connecting portion 27a is bent at approximately 60 degrees with respect to the right side plate 26R, and is bent at approximately 30 degrees with respect to the portion of the right inner flap 27R excluding the connecting portion 27a.

The pair of outer flaps 28 face each other with their leading edges separated by a predetermined distance.

Further, the outer flap 28 is fixed to the outer surface of the inner flap 8 (left inner flap 27L and right inner flap 27R) via an adhesive G, respectively.

The packaging box 20 is assembled by punching out a substantially rectangular corrugated paperboard 20x shown in FIG. 5 from base paper, and then folding it. Hereinafter, the structure of the corrugated paperboard 20x will be explained with reference to FIG.

As shown in FIG. 5, the corrugated paperboard 20x includes a left side plate 26L, a bottom plate 25, a right side plate 26R, a top plate 24, and an adhesive piece 29, which are connected in this order from the left side through the trunk crease line e. . The top plate 24, the bottom plate 25, the left side plate 26L, and the right side plate 26R are all formed in a substantially rectangular shape, and the adhesive piece 29 is formed in a substantially inverted trapezoid shape.

The top plate 24 and the bottom plate 25 have outer flaps 28 connected to their upper and lower ends via outer flap fold lines f, respectively. Each of the outer flaps 28 is formed into a substantially rectangular shape. The total length from the proximal end to the distal end of the pair of outer flaps 28 is designed to be smaller than the length in the width direction (horizontal direction in FIG. 5) of the inner flaps 27 (left inner flap 27L and right inner flap 27R). has been done.

In FIG. 5, left inner flaps 27L are connected to the upper and lower ends of the left side plate 26L via left inner flap fold lines g. The left inner flap 27L is formed into a substantially rectangular shape.

Right inner flaps 27R are connected to the upper and lower ends of the right side plate 26R via the right inner flap fold line h. The inner right flap fold line h is formed in an arc shape that connects both corners of the inner right flap 27R on the proximal end side and expands in a direction away from the tip of the inner right flap 27R. In the second embodiment, the right inner flap fold line h is designed to be R500.

The right inner flap 27R has an inner flap mountain fold line i (corresponding to the "inner flap mountain fold line" of the third packaging box of the present invention) and an inner flap mountain fold line i (corresponding to the "inner flap mountain fold line" of the third packaging box of the present invention) on the tip side of the right inner flap fold line h. It also corresponds to the "approximate fold line" of a packaging box). The inner flap mountain fold line i is formed in an arc shape that connects both corners on the base end side of the inner right flap 27R and swells in a direction approaching the tip of the inner right flap 27R. In the second embodiment, the inner flap mountain fold line i is designed to have R250.

The total length of the left inner flap 27L from the base end to the tip and the length of the left inner flap 27R from the base end (right inner flap fold line h) to the tip is the total length of the top plate 24 and bottom plate 25 (or outer It is designed to be larger than the width of the flap 28).

Next, a procedure for assembling the packaging box 20 shown in FIG. 4 from the corrugated paperboard 20x shown in FIG. 5 will be described.

First, the corrugated paperboard 20x is placed on, for example, a stand (not shown) by an operator, and a plurality of products (not shown) are placed on the bottom plate 25 in a lined manner.

Next, in FIG. 5, the left side plate 26L disposed on the left side of the bottom plate 25 is bent along the trunk crease line e, and stands up at right angles to the bottom plate 25. Then, an adhesive G (not shown) is applied to the outer surface of the upper end of the left side plate 26L that has been erected.

Next, by sequentially bending the bottom plate 25 along the trunk crease line e located on the right side, the right side plate 26R is erected at right angles to the bottom plate 25, the top plate 24 is made parallel to the bottom plate 25, and the adhesive piece 29 is hanging down. Then, the inner surface of the adhesive piece 29 is fixed to the outer surface of the left side plate 26L via the adhesive G, so that the body portion 22 is assembled.

Next, the right inner flap 27R is bent toward the inside of the body portion 22 at right angles to the right side plate 26R along the right inner flap fold line h and the inner flap mountain fold line i.

More specifically, first, the right inner flap fold line h provided at the base end of the right inner flap 27R is formed in an arc shape that swells in a direction away from the tip of the right inner flap 27R, so it naturally curves. Instead, the right inner flap 27R is curved along the width direction toward the outer space of the packaging box 20, and the right inner flap 27R is curved along the width direction toward the inner space of the packaging box 20. As a result, the right inner flap 27R is bent by approximately 60 degrees with respect to the right side plate 26R.

Next, the inner flap mountain fold line i provided on the tip side of the inner right flap fold line h of the inner right flap 27R is formed in an arc shape that bulges in the direction approaching the tip of the inner right flap 27R, so it cannot be bent. As a result, a portion of the right inner flap 27R on the proximal end side is deformed into a leaf-shaped connecting portion 27a.

A portion of the proximal end side (connection portion 27a) of the right inner flap 27R is curved toward the internal space of the packaging box 20 when folded along the right inner flap fold line h; By bending the right inner flap along the fold line h, which is formed in an arc shape that bulges in the direction toward the tip of the flap, it is returned to a flat state. On the other hand, the distal end side of the right inner flap 27R from the connecting portion 27a is curved outward of the packaging box 20 along the width direction. As a result, the distal end side of the right inner flap 27R relative to the connecting portion 27a is bent by approximately 30 degrees with respect to the connecting portion 27a.

As explained above, the right inner flap fold line h and the inner flap mountain fold line i do not bend naturally like normal straight folds, but by bending them slightly forcefully, each part of the packaging box 20 can be bent. It is acceptable while absorbing the deformation that occurs. However, the right inner flap fold line h and the inner flap mountain fold line i have both ends located at both corners of the proximal end side of the right inner flap 27R and are common because they connect the two corners. Just by pushing the flaps 27R slightly toward the inside of the body 22, the flaps 27R can be bent in sequence.

Next, the left inner flap 27L is bent toward the inside of the body portion 22 at a right angle to the left side plate 26L along the left inner flap fold line g.

At this time, the total length of the left inner flap 27L from the base end to the tip and the length of the left inner flap 27R from the base end to the tip is greater than the width of the top plate 24 and the bottom plate 25, so the left As shown in FIG. 6, the tip of the inner flap 27L is overlapped with the outer surface of the right inner flap 27R. As a result, in the closing portion 23 of the packaging box 20, the left inner flap 27L is overlapped with the outer surface of the right inner flap 27R, and the right inner flap 27R is pushed into the inner space of the packaging box 20, thereby creating a step.

Next, as shown in FIG. 4, adhesive G is applied to the outer surfaces of the left inner flap 27L and the right inner flap 27R at positions where the outer flaps 28 are overlapped.

Next, as shown in FIG. 4, the lower outer flap 28 is bent upward along the outer flap fold line f, and the inner surface of the lower outer flap 28 is attached to the inner flap 7 (left inner flap) through the adhesive G. 27L and right inner flap 27R), the upper outer flap 28 is bent downward at the outer flap crease line f, and the inner surface of the upper outer flap 28 is attached to the inner flap 7 (left It is fixed to the outer surface of the inner flap 27L and the right inner flap 27R).

At this time, the total length from the base end to the tip of the pair of outer flaps 28 is the length of the inner flap 27 (left inner flap 27L and right inner flap 27R) in the width direction (vertical direction in FIG. 4). Since the outer flaps 28 are designed to be smaller than each other, the leading edges of the pair of outer flaps 28 face each other with a predetermined distance therebetween. As a result, the open end of the body portion 22 is closed, and a closed portion 23 is formed. Through the above steps, the assembly of the packaging box 20 containing the product is completed, and the packaging box 20 in the state shown in FIG. 4 is completed.

Next, the functions and effects of the packaging box 20 of the second embodiment will be explained with reference to FIGS. 4 and 6.

As shown in FIG. 4, in the packaging box 20 of the second embodiment, the entire tip of the left inner flap 27L overlaps the outer surface of the right inner flap 27R. Even if there is a gap between the leading edges, it is possible to eliminate the gap that occurs in the center of the closed portion 23 and communicates from the outside to the inside. Therefore, according to the packaging box 20 of the second embodiment, it is possible to suppress foreign matter from entering the inside of the packaging box 20.

Conversely, in the packaging box 20 of the second embodiment, the gap between the pair of outer flaps 28 can be filled by the overlap of the inner flaps 27, so even if the closing portion 23 has a vertically elongated shape, the outer flaps 28 can be made longer. It is not necessary to butt them together, and they can be shortened. Therefore, according to the packaging box 20 of the second embodiment, the area of the corrugated paperboard 20x can be reduced.

By the way, in the closing part 23 of the packaging box 20, a step is created because the left inner flap 27L is overlapped with the outer surface of the right inner flap 27R. As a result, the upper left inner flap 27L easily contacts the outer flap 28, but the lower right inner flap 27R is pushed into the inner space of the packaging box 20 by the left inner flap 27L, making it difficult to contact the outer flap 28. Cheap.

However, since the bending of the right inner flap 27R along the right inner flap fold line h and the inner flap mountain fold line i is allowed while being absorbed in each part of the packaging box 20, A strong restoring force is generated to try to return to the normal posture. Therefore, even if the outer surface of the right inner flap 27R is pressed against the left inner flap 27L at its tip, the restoring force causes the entire right inner flap 27R, except for the tip, to rebound toward the outside of the packaging box 20. ing.

Further, as shown in FIG. 6, the connecting portion 27a of the right inner flap 27R is inclined with respect to each of the right inner flap 27R and the outer flap 28, and the left side edge (inner flap mountain fold line i) of the connecting portion 27a is , are arranged in a convex shape toward the outside of the packaging box 20. As a result, even if the leading end side of the right inner flap 27R is pushed toward the inner space of the packaging box 20, the inner right flap 27R can be projected toward the outer space of the packaging box 20 with the portion along the inner flap mountain fold line i as a ridgeline. The flap 18 can be accessed.

Therefore, in the packaging box 20 of the second embodiment, when trying to press the outer flap 28 toward the inner space of the packaging box 20 and press it with the adhesive G, the right inner flap 27R is a portion along the inner flap mountain fold line i. Since the right inner flap 27R is repelled as a ridgeline, it is easy to adhere the right inner flap 27R to the outer flap 28 along the portion along the inner flap mountain fold line i.

Therefore, according to the packaging box 20 of the second embodiment, not only the left inner flap 27L but also the right inner flap 27R can be sufficiently crimped to the outer flap 28 with the adhesive G, so that assembly can be performed reliably.

[Third embodiment]
Hereinafter, a packaging box 30 (not shown) according to a third embodiment of the present invention will be described with reference to FIGS. 7 and 8. Note that the packaging box 30 according to the third embodiment corresponds to the first packaging box of the present invention and the third packaging box of the present invention described in the means for solving the problems.

In addition, the packaging box 30 is one of the modified examples of the packaging box 20 of the second embodiment, and differs from the packaging box 20 in the shape of the right side plate and the right inner flap, so only this point will be explained, and the packaging box 20 and Descriptions of common configurations will be omitted.

A rectangular connecting portion 37a is formed at the base end of the right inner flap 37R. The connecting portion 37a is bent at a right angle to the right side plate 36R, and is bent at approximately 5° with respect to the portion of the right inner flap 37R excluding the connecting portion 37a.

The packaging box 30 is assembled by punching out a substantially rectangular corrugated paperboard 30x shown in FIG. 7 from base paper, and then folding it. Right inner flaps 37R are connected to the upper and lower ends of the right side plate 36R via straight inner right flap fold lines h'. The right side plate 36R is formed in a substantially rectangular shape.

The right inner flap 37R has a straight inner flap fold line i' (corresponding to the "inner flap fold line" of the third packaging box of the present invention) on the tip side of the right inner flap fold line h'. It also corresponds to the "approximate fold line" of the first packaging box of the present invention. The inner flap mountain fold line i' connects the intermediate portions of both side edges of the inner right flap 37R, and is formed parallel to the inner right flap fold line h'.

Next, a procedure for assembling the packaging box 30 from the corrugated paperboard 30x shown in FIG. 7 will be described with regard to the closing portion 33.

Next, the right inner flap 37R is bent toward the inside of the body portion 32 at right angles to the right side plate 36R along the right inner flap fold line h'. Further, while maintaining the angle of the connecting portion 37a provided at the base end of the right inner flap 37R, the tip side of the connecting portion 37a of the right inner flap 37R is directed toward the internal space of the body portion 32 at the inner flap mountain fold line i'. Then, it is bent at approximately 5 degrees with respect to the connecting portion 37a.

Next, the left inner flap 37L is bent toward the inside of the body 32 at a right angle to the left side plate 36L along the left inner flap fold line g.

At this time, the total length of the left inner flap 37L from the base end to the tip and the length of the left inner flap 37R from the base end to the tip is greater than the width of the top plate 34 and the bottom plate 35, so the left As shown in FIG. 6, the tip of the inner flap 37L is overlapped with the outer surface of the right inner flap 37R. As a result, in the closing part 33 of the packaging box 30, the left inner flap 37L is overlapped with the outer surface of the right inner flap 37R, and the tip side of the right inner flap 37R is pushed into the inner space side of the packaging box 30 from the connecting part 37a. There will be a difference in level.

Next, adhesive G is applied to the outer surfaces of the left inner flap 37L and the right inner flap 37R at the position where the outer flap 38 is overlapped, and the lower outer flap 38 is bent upward at the outer flap fold line f, The inner surface of the lower outer flap 38 is fixed to the outer surface of the inner flap 7 (the connecting portion 37a of the left inner flap 37L and the right inner flap 37R) via adhesive G, and the upper outer flap 38 is fixed to the outer flap fold line. It is bent downward at f, and the inner surface of the upper outer flap 38 is fixed to the outer surface of the inner flap 7 (the connecting portion 37a of the inner left flap 37L and the inner right flap 37R) via the adhesive G.

As a result, the open end of the body portion 32 is closed, and a closed portion 33 is formed. Through the above steps, the assembly of the packaging box 30 containing the product is completed, and the packaging box 30 in the state shown in FIG. 4 is completed.

Next, with reference to FIG. 8, the functions and effects of the packaging box 30 of the third embodiment that are specific to the packaging box 20 will be described.

As shown in FIG. 8, in the closed portion 33 of the packaging box 30, a step is created by the left inner flap 37L being overlapped with the outer surface of the tip of the right inner flap 37R. As a result, the upper left inner flap 37L easily contacts the outer flap 38, but the lower right inner flap 37R is pushed into the inner space of the packaging box 30 by the left inner flap 37L, making it difficult to contact the outer flap 38. Cheap.

However, by bending the right inner flap 37R along the inner flap mountain fold line i', the connecting portion 37a remains on the same plane as the left inner flap 37L, and only the portion on the tip side from the connecting portion 37a is folded into the packaging box. It is pushed towards the internal space of 30. In other words, even if the leading end of the right inner flap 37R is pushed toward the inner space of the packaging box 30 by the left inner flap 37L, the outer space of the packaging box 30 has a portion along the inner flap mountain fold line i' as a ridgeline. It can also be said that the entire connecting portion 37a can be moved closer to the outer flap 18 by displacing the connecting portion 37a toward the outer flap 18.

In addition, since both the right inner flap fold line h' and the inner flap peak fold line i' are straight, when the connecting portion 37a is bent along the right inner flap fold line h' and the inner flap peak fold line i', In addition, it is arranged flat and on the same plane as the left inner flap 37L without being curved.

Thereby, the right inner flap 37R can be bonded surface to surface to the outer flap 18 at the connecting portion 37a.

Therefore, according to the packaging box 30 of the third embodiment, not only the left inner flap 37L but also the right inner flap 37R can be sufficiently crimped to the outer flap 38 with the adhesive G, so that assembly can be performed reliably.

[Modifications common to each embodiment]
In each of the above embodiments, cardboard is used as an example of the material, but the material may be cardboard or a thin synthetic resin board as long as it can be assembled by folding and can be broken along the breakable line. Good too. Further, in each of the above embodiments, adhesive is used as an example of the fixing means, but the fixing means may be staples or adhesive tape.

In the first embodiment, the V-shaped outer flap fold line b provided on the outer flap 18 will be explained as an example of the approaching fold line of the present invention, and in the second embodiment, the inner flap 17 (right inner flap 17R ) (in the third embodiment, the inner flap fold line i' provided on the inner flap 27 (right inner flap 27R)) has been described as an example, but the approaching fold line of the present invention may be provided on either the inner flap or the outer flap as long as it brings the outer flap closer to the other inner flap that would otherwise be separated from the outer flap due to a difference in level.

In each of the above embodiments, the left inner flap is superimposed on the outer surface of the right inner flap.
There is no limitation on the right and left sides, and the right inner flap may be superimposed on the outer surface of the left inner flap.

In each of the above embodiments, the distal end of the left internal flap is overlapped with the outer surface of the distal end of the right internal flap. As long as it can be adhered to the outer flap, half or more of the flap, excluding the proximal end, may be overlapped.

In each of the above embodiments, the entire distal end portion of the left inner flap is overlapped with the outer surface of the entire distal end portion of the right inner flap. As long as they are placed in a position to close the gap between the distal edges of the outer flaps, they may be overlapped at a portion of each distal end.

In each of the above embodiments, the inner flap and the outer flap are formed into a substantially rectangular shape, but the inner flap and the outer flap may have a polygonal shape such as a trapezoid shape or a triangular shape, or a semicircular shape. It's okay.

[Modification of the first embodiment]
In the first embodiment, the outer flap crease line b is formed in a V-shape that protrudes toward the trunk 12 side than on the extension line of the inner flap crease line d, but the outer flap crease line b can be bent with a plurality of bends as long as it connects both corners of the base end of the outer flap 18 and is formed in a convex shape in the direction away from the tip of the outer flap 18. It may also be curved in an arc. Further, the outer flap fold line b may have the bent portion 18a, but the outer flap left bend line b1 and the outer flap right bend line b2 may not be linear but may be formed in different arc shapes.

In the first embodiment, the outer flap left turn line b1 is longer than the outer flap right turn line b2, but the outer flap left turn line b1 may be the same length as the outer flap right turn line b2, or may be shorter.

In the first embodiment, the outer flap valley fold line c extends along the trunk fold line a from the bent portion 18a of the outer flap 18 to the middle part of the distal edge thereof. For example, since the outer flap fold line b may be arcuate and have no bent portion, the fold line c may be connected to the outer flap fold line b at a location other than the bent portion, and furthermore, the outer flap fold line b may be connected to the outer flap fold line b at a location other than the bent portion. Since it is sufficient that the flap 18 can be easily made into a convex shape toward the inner space of the packaging box 1, it is not necessary to provide it only at the center of the outer flap 18 and not to connect it to the outer flap fold line b or the tip edge of the outer flap 18. .

Further, in the first embodiment, the outer flap 18 is provided with one outer flap valley fold line c, but a plurality of outer flap valley fold lines c may be provided. The book may be provided in parallel along the trunk fold line a, or may be provided radially from the center of the tip edge of the outer flap 18.

In the first embodiment, the inner surface of the outer flap left half 18L of the outer flap 18 and the outer surface of the left inner flap 17L are in surface-to-plane contact, and the outer flap right half 18R of the outer flap 18 is in contact with the outer surface of the left inner flap 17L. The explanation has been given using an example in which the inner surface of the left inner flap 17R and the outer surface of the right inner flap 17R are in contact with each other surface to surface. It may be bonded by line contact or point contact.

[Modifications of the second embodiment and the third embodiment]
In the second embodiment and the third embodiment, the leaf-shaped connecting portion 27a and the rectangular connecting portion 37a are explained as examples, but the connecting portion may have a triangular shape, a pentagonal shape, a hexagonal shape, etc. .

In the second embodiment, the right inner flap fold line h is formed in an arc shape that bulges away from the tip of the right inner flap 27R, but as described in the third embodiment, The right inner flap fold line may be a straight line, or a straight line may be connected by a plurality of bends.

In the second embodiment, the inner flap mountain fold line i is formed in an arc shape that bulges in the direction approaching the tip of the right inner flap 27R. However, as explained in the third embodiment, The flap mountain fold line i may be a straight line, or may be a straight line connected by a plurality of bends. Note that only one of the right inner flap fold line h and the inner flap mountain fold line i in the second embodiment can be made straight.

In the second embodiment and the third embodiment described above, the case where one inner flap mountain fold line i was provided for the right inner flap was explained as an example, but a plurality of inner flap mountain fold lines i may be provided. good.

In addition, in the second embodiment, the right inner flap fold line h is designed to be R500, and the inner flap mountain fold line i is designed to be R250, but there is no limitation on the radius of curvature, and the right inner flap fold line h and the inner flap fold line i are designed to be R250. The radius of curvature of the mountain fold line i may be the same, or the radius of curvature of the inner flap mountain fold line i may be larger.

10 Packaging box 12 Body part 13 Closure part 14 Top plate 15 Bottom plate 16 Side wall plate 17 Inner flap 17L Left inner flap 17R Right inner flap 18 Outer flap 18a Bent part 20 Packaging box 22 Body part 23 Closure part 24 Top plate 25 Bottom plate 26 Side wall Plate 27 Inner flap 27L Left inner flap 27R Right inner flap 28 Outer flap 30 Packaging box 32 Body part 33 Closure part 34 Top plate 35 Bottom plate 36 Side wall plate 37 Inner flap 37L Left inner flap 37R Right inner flap 38 Outer flap a Body fold Line of sight b Outer flap fold line (approach fold line)
b1 Outer flap left turn line (straight line)
b2 Outer flap right turn line (straight line)
c Outer flap valley crease line d Inner flap crease line e Body crease line f Outer flap crease line g Inner flap crease line h Inner flap crease line h' Inner flap crease line i Inner flap mountain crease line (approach crease line)
i' Inner flap mountain fold line (approach fold line)

Claims (7)

A packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body,
The body is configured by a top plate, a bottom plate, and a pair of side wall plates connected together via a body fold line,
The closing portion includes a pair of inner flaps that are connected to the pair of side wall plates via inner flap fold lines, and a pair of inner flaps that are continuous to the top plate and the bottom plate via outer flap fold lines, and a a pair of outer flaps secured to the surface;
The pair of outer flaps have distal edges facing each other with a predetermined interval therebetween,
The tip of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the tip edges of at least a pair of outer flaps,
The packaging box is characterized in that the outer flap or the other inner flap has an approach fold line that bends the outer flap or the other inner flap to bring them closer together. A packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body,
The body is configured by a top plate, a bottom plate, and a pair of side wall plates connected together via a body fold line,
The closing portion includes a pair of inner flaps that are connected to the pair of side wall plates via inner flap fold lines, and a pair of inner flaps that are continuous to the top plate and the bottom plate via outer flap fold lines, and a a pair of outer flaps secured to the surface;
The pair of outer flaps have distal edges facing each other with a predetermined interval therebetween,
The tip of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the tip edges of at least a pair of outer flaps,
The packaging box is characterized in that the outer flap fold line connects both corners of the proximal end of the outer flap and is formed in a convex shape in a direction away from the tip of the outer flap. The packaging box according to claim 2,
The outer flap fold line is formed in a V-shape in which two straight parts are connected by a bent part,
The packaging box is characterized in that the outer flap has an outer flap valley fold line extending from the bent portion to an intermediate portion of the leading edge of the outer flap. The packaging box according to claim 3,
A packaging box characterized in that the distance from the outer flap valley fold line of the outer flap to the proximal end of the one inner flap is equal to or greater than the distance from the proximal end to the tip of the one inner flap. A packaging box having a rectangular cylindrical body and a pair of closing parts that respectively close open ends of the body,
The body is configured by a top plate, a bottom plate, and a pair of side wall plates connected together via a body fold line,
The closing portion includes a pair of inner flaps that are connected to the pair of side wall plates via inner flap fold lines, and a pair of inner flaps that are continuous to the top plate and the bottom plate via outer flap fold lines, and a a pair of outer flaps secured to the surface;
The pair of outer flaps have distal edges facing each other with a predetermined interval therebetween,
The tip of one inner flap is overlapped with the outer surface of the other inner flap in a region sandwiched between the tip edges of at least a pair of outer flaps,
The packaging box, wherein the other inner flap has an inner flap mountain fold line that connects both side edges of the other inner flap on the tip side of the inner flap fold line. The packaging box according to claim 5,
The inner flap fold line provided along the base end of the other inner flap connects both corners on the base end side of the other inner flap and expands in a direction away from the tip of the other inner flap. formed in an arc shape,
The packaging box is characterized in that the inner flap mountain fold line is formed in an arc shape that connects both corners on the proximal end side of the other inner flap and swells in a direction approaching the tip of the other inner flap. The packaging box according to claim 5,
The inner flap fold line provided along the base end of the other inner flap is formed in a straight line so as to be paired with the inner flap crease line provided along the base end of the one inner flap. is,
The packaging box is characterized in that the inner flap mountain fold line is formed in a straight line connecting the intermediate portions of both side edges of the other inner flap.

Images