JP2024036740A - packaging box - Google Patents

Abstract

[Problem] To provide a packaging box that allows easy insertion of fingers into the gap between the packaging box and a product. A packaging box 1 includes a rectangular cylindrical body 2 consisting of three or more side plates 4, 4, 5, 5, a bottom 3 that closes a lower open end of the body 2; A flap 41 is connected to the upper edge of at least one predetermined side plate 4 via a fold line b, and a widthwise intermediate portion of the tip of the flap 41 and both corner portions of the lower end of the predetermined side plate 4 are provided. A pair of inclined fold lines 7 are provided. [Selection diagram] Figure 1

Description

The present invention relates to packaging boxes.

2. Description of the Related Art Conventionally, so-called A-type packaging boxes capable of storing and transporting products have been known.

This packaging box consists of a rectangular cylindrical body extending in the vertical direction and a pair of closing parts that respectively close the upper and lower open ends of the body, and the body has a pair of long sides and a pair of short sides. The closure part consists of a pair of inner flaps that are connected to each other via inner flap fold lines on the upper and lower edges of each short side, and a pair of inner flaps that are connected to the upper and lower edges of each long side. Each of the outer flaps has an outer flap connected to the outer flap via an outer flap fold line. In addition, this packaging box is made by folding the inner flap inward along the inner flap fold line, then folding the outer flap along the outer flap so that it overlaps the outer surface of the inner flap, and then It is sealed by pasting adhesive tape along the tip edge of the outer flap from the top of one short side to the top of the other short side.

In this packaging box, in order to prevent the box in which the product is packed from getting dirty, the box is sometimes housed inside and used for double packaging. In this case, the inner dimensions of the packaging box are often designed to be approximately the same as the outer dimensions of the box so that the box does not swing around inside the packaging box without using a separate cushioning material or the like.

However, in this case, since there is almost no gap between the body and the box, there is a problem that it is difficult to insert your fingers into the gap when opening the upper closed part of the packaging box and taking out the box from the body. be.

From this point of view, an inverted V-shaped groove is formed on the short side surface that connects the center part in the left-right direction of the upper edge and both ends in the left-right direction of the lower edge, and the apex of the groove is formed in the inner flap. An improved packaging box is known in which an easy-to-fold line is formed that extends from the front edge to the leading edge (see Patent Document 1).

In this improved packaging box, when the short side is pushed in the direction away from the box body, the short side is first bent along the groove, and the short side is turned outward from the packaging box with its lower edge as the axis of rotation. It is inclined, and its upper edge is bent into a V-shape in plan view. At the same time, the upper edge of the short side is bent into a V-shape in a plan view, thereby bending the inner flap into a V-shape in a plan view along the easy-to-bend line. Thereby, according to this improved direction box, the gap between the short side surface and the box body can be increased.

Utility model registration No. 3224539

However, in this improved packaging box, the short sides are inclined toward the outside of the packaging box, so the gap can be increased upward, but the inner flaps remain parallel to the vertical direction when viewed from above. Since it is bent into a V-shape, the gap is not enlarged even if it is bent, and there is a problem that it is not easy to insert fingers.

Note that this problem is not limited to cases where boxes of similar shapes are housed inside the packaging box, but also occurs when the product housed in the packaging box is simply large.

The present invention was made to solve such problems, and an object of the present invention is to provide a packaging box in which it is easy to insert fingers into the gap between the packaging box and the product.

In order to achieve such an object, the packaging box of the present invention includes a rectangular cylindrical body made of three or more side plates, a bottom portion that closes the lower open end of the body, and at least one predetermined side plate. a flap connected to the upper edge of the side plate via a crease line, and a pair of inclined crease lines connecting the widthwise middle part of the tip of the flap and both corners of the lower end of the predetermined side plate. (Packaging box of the first invention).

In the packaging box of the present invention, certain side plates and flaps can be flattened by stretching the flaps along the fold line. Then, the predetermined side plates and flaps are valley-folded along a pair of inclined fold lines by pushing the middle part in the width direction away from the packaging box, and the packaging box is folded with the lower edge of the predetermined side plates as the rotation axis. Slanted outward.

As a result, the gap between the product and the product in plan view is maximum at the tip edge of the flap, and gradually decreases toward the lower edge of the predetermined side plate.

Therefore, according to the packaging box of the present invention, the gaps between the predetermined side plates and flaps and the product can be tapered, making it easier to insert fingers.

By the way, when a product is double-packed with a box and a packaging box, the box is opened while the product is still inside the packaging box, the product is inspected, and then the box is resealed with adhesive tape. Usage may be required. However, in the packaging box of the first aspect of the present invention, when the hand is released from the predetermined side plate that has been pushed in, the restoring force of the cardboard causes the gap to disappear, so when resealing the box, adhesive tape is applied to the side plate of the box. The problem is that it is difficult.

Therefore, in the packaging box of the present invention, the flap has a flap valley fold line formed outside the area sandwiched between the pair of inclined fold lines and extending from the side edge to the tip of the outer flap, and The flap valley fold line is preferably formed at a position where the flap is inserted into the internal space of the packaging box when the flap is folded back along the flap valley fold line. ).

In the packaging box of the second aspect of the present invention, the flap can be folded back along the flap valley fold line and inserted into the internal space of the packaging box, so that the tip side of the flap can be locked to the product. At this time, the restoring force that tries to extend the flap that has been folded back at the flap valley fold line is due to the fact that the tip of the flap is locked to the product. This is converted into a force that pushes the flap on the proximal side of the valley fold line and a predetermined side plate connected thereto in a direction away from the packaging box.

Therefore, according to the packaging box having this configuration, the gap is maintained even when the user releases the user's hand, so it is easy to insert the user's finger. Taking double packaging as an example, when resealing the box with adhesive tape after inspecting the product, the gap will remain even if you let go of the packaging box, so you should insert your finger into the gap. This has the effect of making it easier to apply adhesive tape to the short sides of the box.

In the packaging box of the second aspect of the present invention, it is preferable that the flap valley fold line connects the base end of the side edge of the flap and the tip of the flap (packaging box of the third aspect of the present invention).

In the packaging box of the third aspect of the present invention, the flap valley fold line can be made longer by providing the flap valley fold line from the base end to the tip of the side edge of the flap. Therefore, according to the packaging box having this configuration, the restoring force that tends to extend the flap folded back along the flap valley fold line can be strengthened.

Therefore, according to the packaging box of the third aspect of the present invention, it is possible to increase the force for pushing the flap on the proximal end side from the flap valley fold line and the predetermined side plate connected thereto in the direction away from the packaging box. Even if you release your hand, the gap remains wide, making it easy to insert your fingers.

In the packaging box of the second aspect of the present invention or the packaging box of the third aspect of the present invention, the flap valley fold line is convex in a direction approaching the adjacent slanted fold line or convex in a direction away from the adjacent slanted fold line. (packaging box of the fourth invention).

In the packaging box of the fourth aspect of the present invention, since the flap valley fold line is not straight, it does not naturally bend, and it is necessary to bend it a little forcefully. Therefore, the restoring force that tries to extend the flap folded back at the flap valley fold line can be strengthened, so that the flap on the proximal end side from the flap valley fold line and the predetermined side plate connected thereto are separated from the packaging box. The force of pushing in the direction can be increased.

Therefore, according to the packaging box of the fourth aspect of the present invention, the gap can be maintained wide even when the user's hand is released, so it is easy to insert the user's fingers.

In the packaging box of the second aspect of the present invention or the packaging box of the third aspect of the present invention, the flap valley fold line has a V-shape bent convexly in a direction approaching the adjacent inclined fold line, and the flap a first flap valley fold line extending linearly from a side edge of the flap toward the adjacent inclined fold line; and a second flap valley fold line extending linearly from the tip of the flap along the inclined fold line. is preferable (fifth packaging box of the present invention).

In the packaging box of the fifth aspect of the present invention, similarly to the packaging box of the third aspect of the present invention, by lengthening the flap valley fold line, the restoring force that tries to stretch the flap folded back at the flap valley fold line is strengthened. be able to.

Further, in the packaging box of the fifth aspect of the present invention, since the flap valley fold line is V-shaped, it cannot be naturally bent, and it is necessary to bend it a little forcefully. Therefore, according to the packaging box having this configuration, it is possible to increase the restoring force that tends to extend the flap that is bent along the flap valley fold line.

Therefore, according to the packaging box having this configuration, by making the flap valley fold line long and V-shaped, the restoring force of the flap that is bent at the flap valley fold line can be strengthened, so that the flap can be easily released. It is possible to maintain a wide gap even when using the device, making it easy to insert fingers.

In the packaging box of the fifth aspect of the present invention, the flap valley fold line is provided so as to connect the first flap valley fold line and the second flap valley fold line, and the flap valley fold line extends from the tip of the first flap valley fold line to the first flap valley fold line. It has a cut portion formed in a V-shape, having a portion extending along the extension line of the valley fold line to the inclined fold line and a portion extending along the inclined fold line to the tip of the second flap valley fold line. is preferable (sixth packaging box of the present invention).

The fold line including the flap valley fold line is generally straight, and if it is a gentle arc, it can be easily bent, but if it is bent in a V-shape, it may not be possible to bend it as intended. It can be difficult. On the other hand, in the packaging box of the sixth aspect of the present invention, by providing a cut in the bending portion of the flap valley fold line, it is easy to fold back as intended even if the flap valley fold line is V-shaped.

Therefore, according to the packaging box of the sixth aspect of the present invention, by forming the flap valley fold line into a V-shape, the restoring force of the flap that is bent at the flap valley fold line is strengthened, and the flap is folded along the flap valley fold line as intended. Since the flap can be folded along the flap valley fold line, it is easy to maintain the gap.

In the packaging box of the second aspect of the present invention, the flap valley fold line is formed to extend at an angle of less than 45° with respect to the proximal edge of the outer flap, and the flap is formed at a corner on the tip side of the flap. It is preferable to have a chamfered part formed by cutting off the packaging box of the present invention (seventh aspect of the present invention).

In the packaging box of the seventh aspect of the present invention, the flap valley fold line is formed to extend at an angle of less than 45° with respect to the proximal edge of the outer flap, so that the side edge of the flap extends from the proximal end to the distal end. As it goes towards the end, it becomes wider and is inserted into the internal space of the packaging box.

Therefore, according to the packaging box of the seventh aspect of the present invention, by cutting off the corner on the tip side of the flap as a chamfer, the amount of the flap inserted into the internal space of the packaging box can be adjusted. It is easy to create a gap between the product and the packaging box.

FIG. 1 is a perspective view showing the appearance of a packaging box according to the present embodiment. FIG. 2 is a plan view showing the configuration of the packaging box according to the present embodiment before assembly. FIG. 2 is a plan view of the packaging box according to the present embodiment, and is a plan view illustrating deformation of the inner flap and short side when the inner flap and short side are pushed in a direction away from the packaging box. It is a perspective view of the packaging box concerning this embodiment, and is a perspective view explaining the state where a folding piece was made to lock an inner box.

[Configuration of packaging box 1]

Hereinafter, a packaging box 1 according to an embodiment of the present invention (hereinafter simply referred to as "this embodiment") will be described with reference to the drawings.

As shown in FIG. 1, the packaging box 1 of this embodiment is a so-called A-type corrugated box type having a rectangular parallelepiped appearance.

In the packaging box 1, a box body (hereinafter simply referred to as "inner box K") is housed inside. The inner box K stores a product (not shown) therein, and is stored inside the packaging box 1 to prevent the inner box K itself from getting dirty. As a result, the product is double-packed.

The inner dimensions of the packaging box 1 are set to be approximately the same as or slightly larger than the outer dimensions of the inner box K. Thereby, in the packaging box 1, the inner box K is prevented from swinging within the packaging box 1 without using a cushioning material or the like.

The packaging box 1 has a rectangular cylindrical body 2 extending in the vertical direction, and a pair of closing parts 3 that close the upper and lower open ends of the body 2.

The body portion 2 includes a pair of short sides 4 and a pair of long sides 5. The pair of short sides 4 face each other in the left-right direction, and the pair of long sides 5 face each other in the front-rear direction. In addition, both the short side surface 4 and the long side surface 5 correspond to the "side plate" in this invention, and the short side surface 4 especially corresponds to a "predetermined side plate."

The closing portion 3 is composed of a pair of inner flaps 41 (42) and a pair of outer flaps 51 (52). Note that the inner flap 41 corresponds to the "flap" in the present invention.

The packaging box 1 is assembled by punching out a substantially rectangular corrugated paperboard 1x shown in FIG. 2 from a base paper, and then folding it. Hereinafter, the structure of the corrugated paperboard 1x will be described with reference to FIG. 2. Note that the surface of each element of the corrugated paperboard 1x in FIG. 2 is a portion that becomes the inner surface of the packaging box 1 when the packaging box 1 is assembled.

First, the outline of the structure of the corrugated paperboard 1x will be explained.

As shown in FIG. 2, the corrugated paperboard 1x has a long side 5, a short side 4, a long side 5, a short side 4, and an adhesive piece 6 connected in this order from the left side through the body fold line a. There is. Both the short side surface 4 and the long side surface 5 are formed into a substantially rectangular shape, and have the same length in the vertical direction, and the length in the left and right direction is set such that the long side surface 5 is longer than the short side surface 4.

An upper inner flap 41 is connected to the upper end of the short side 4 via an upper inner flap fold line b. A lower inner flap 42 is connected to the lower end of the short side 4 via a lower inner flap fold line c. The upper inner flap 41 and the lower inner flap 42 both have the same rectangular shape. The total length of the pair of upper inner flaps 41 (lower inner flaps 42) from the base ends to the distal ends is set to be smaller than the length of the long side surface 5 in the left-right direction.

An upper and outer flap 51 is connected to the upper end of the long side surface 5 via an upper and outer flap fold line d. A lower outer flap 52 is connected to the lower end of the long side surface 5 via a lower outer flap fold line e. Both the upper outer flap 51 and the lower outer flap 52 have the same rectangular shape. The total length of the pair of upper and outer flaps 51 (lower and outer flaps 52) from the base end to the tip is set to be approximately the same as the length of the short side surface 4 in the left-right direction.

Next, the specific configuration of the short side 4 and the upper inner flap 41 of the corrugated paperboard 1x will be described.

A pair of inclined fold lines 7 are provided on the short side 4 and the upper inner flap 41. A pair of inclined fold lines 7 linearly connect the center portion of the tip of the upper inner flap 41 in the width direction (horizontal direction in FIG. 2) and both corners of the lower end of the short side surface 4, forming an inverted V-shape as a whole. is formed.

The upper inner flap 41 is provided with a pair of flap valley fold lines 8 on each side of the triangular area sandwiched between the pair of inclined fold lines 7. The flap valley fold line 8 is formed in a V-shape convexly bent in a direction approaching the adjacent inclined fold line 7, and has a width between the base end of the side edge of the upper inner flap 41 and the tip edge of the upper inner flap 41. It extends in the direction (horizontal direction in FIG. 2) so as to connect the central part.

The flap valley fold line 8 includes a first flap valley fold line 81, a second flap valley fold line 82, and a cut portion 83.

The first flap valley fold line 81 is formed to extend linearly toward the inclined fold line 7 from the base end of the side edge of the upper inner flap 41 to a position immediately before reaching the adjacent inclined fold line 7. The first flap valley fold line 81 is set to form an angle of about 40° with the upper inner flap fold line b.

The second flap crease line 82 is formed to extend linearly along the inclined crease line 7 from the center in the width direction (left-right direction in FIG. 2) of the tip edge of the upper inner flap 41.

The cut portion 83 is a V-shaped cut that connects the first flap valley fold line 81 and the second flap valley fold line 82. Specifically, the cut portion 83 includes a portion that extends from the tip of the first flap valley fold line 81 along an extension of the first flap valley fold line 81 until reaching the inclined fold line 7, and a portion that extends from the tip of the first flap valley fold line 81 to the inclined fold line 7. 7 to the tip of the second flap valley fold line 82 are bent and connected to form a V-shape.

The upper inner flap 41 is provided with a pair of chamfered portions 9. The chamfered portion 9 is formed by cutting off a corner on the tip side of the upper inner flap 41 into a substantially triangular shape.

The upper inner flap 41 has a substantially trapezoidal portion surrounded by the above-described flap valley fold line 8, the side edge of the upper inner flap 41, the tip edge of the upper inner flap 41, and the chamfered portion 9 as a folded piece 43.
[Assembling packaging box 1]

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

First, the long side 5, the short side 4, the long side 5, the short side 4, and the adhesive piece 6 are each bent at right angles along the trunk crease line a, and the outer surface of the adhesive piece 6 has the long side 5 (left long side 5 in FIG. 2) is fixed with an adhesive.

Next, the pair of lower inner flaps 42 are each folded toward the inside of the packaging box 1 along the lower inner flap fold line c so as to be perpendicular to the short side surface 4. Then, the pair of lower outer flaps 52 are each folded along the lower outer flap fold line e so as to overlap the outer surface of the lower inner flap 42. As a result, the leading edges of the pair of lower outer flaps 52 are abutted against each other, and the adhesive tape is pasted along both leading edges.

As described above, the lower open end of the body 2 is closed by the pair of lower inner flaps 42 and the pair of lower outer flaps 52 (corresponding to the "bottom" in the present invention), and the packaging box 1 shown in FIG. is assembled, and the interior box K is stored inside.

Furthermore, the pair of upper inner flaps 41 are each folded toward the inside of the packaging box 1 along the upper inner flap fold line b so as to be perpendicular to the short side surface 4. Then, the upper and outer flaps 51 are each folded along the upper and outer flap fold lines d so as to overlap the outer surface of the upper and inner flaps 41.

As a result, the leading edges of the pair of upper and outer flaps 51 are abutted against each other, and by pasting adhesive tape along both leading edges, the inner box is sealed with the packaging box 1.
[Removal of inner box K]

Next, with reference to FIGS. 1 and 3, the operation of opening the packaging box 1 of this embodiment and taking out the inner box K will be described.

First, as shown in FIG. 1, the adhesive tape attached to the upper and outer flaps 51 is peeled off, the upper closure part 3 is opened, and the upper and outer flaps 51 are bent outward of the packaging box 1. The upper inner flap 41 is extended along the short side 4.

Next, the widthwise center portion (more specifically, the portion sandwiched between the pair of inclined fold lines 7) of the flattened short side surface 4 and the upper inner flap 41 is pushed in the direction away from the packaging box 1. .

At this time, both sides of the short side 4 and the upper inner flap 41 sandwiching the center in the width direction cannot freely fall away from the packaging box 1 because their side edges are supported by the long side 5. As a result, the widthwise central portions of the short side surface 4 and the upper inner flap 41 are valley-folded along the inclined fold line 7 on both sides thereof.

As a result, the widthwise central portions of the short side surface 4 and the upper inner flap 41 are inclined toward the outside of the packaging box 1 with the lower end edge of the short side surface 4 (lower inner flap fold line c) as the rotation axis.

As a result, as shown in FIGS. 1 and 3, a gap is created between the short side 4 of the packaging box 1 and the inner box K into which fingers can be inserted.

Therefore, in the packaging box 1, the interior box K can be taken out from the packaging box 1 by inserting both hands into the left and right gaps and grasping the interior box K.

Next, the effects of the packaging box 1 according to this embodiment will be explained.

As described above, a gap is created between the short side 4 of the packaging box 1 and the inner box K for inserting fingers. Considering this gap as the distance between the inner box K (the plane including the short side thereof), the short side 4, and the upper inner flap 41, this distance is in the width direction of the tip edge of the upper inner flap 41, as shown in FIG. It is maximum at the center and minimum at the lower edge of the short side 4.

That is, when viewed along the front-rear direction shown in FIG. The gap has a tapered shape that gradually narrows from the top to the bottom of the packaging box 1.

Next, in the packaging box 1, insert your fingers into the gap between the short side 4 of the packaging box 1 and the inner box K by sliding your fingers downward along the inner surface on the tip side of the upper inner flap 41. I can do it. In short, in the packaging box 1, by sliding the fingers on the short side 4 and the upper inner flap 41 like a slide, it is possible to insert the fingers deep into the gap.
[Resealing of inner box K]

Next, referring to FIGS. 1, 3, and 4, a description will be given of the operation of opening the packaging box 1 of this embodiment, inspecting the product inside without taking out the inner box K, and resealing it. Note that by opening the upper closing portion 3, the widthwise central portion of the short side surface 4 and the upper inner flap 41 (more specifically, the portion sandwiched between the pair of inclined fold lines 7) is separated from the packaging box 1. The process up to pushing in the direction to create a gap is the same as the removal of the inner box K described above, so the explanation will be omitted.

First, as shown in FIG. 4, the upper inner flap 41 is valley-folded along the flap valley fold line 8. Then, the folded piece 43 of the upper inner flap 41 is inserted into the internal space of the packaging box 1. Then, a restoring force is generated in the upper inner flap 41 that is folded back at the flap valley fold line 8, so that the inner surface of the folded piece 43 is moved away from the proximal inner surface of the upper inner flap 41. do. Thereby, the folding piece 43 is pressed against the short side of the inner box K and locked.

This restoring force causes the base end of the upper inner flap 41 and the short side 4 connected thereto to move away from the packaging box 1 because the folding piece 43 side is locked by the inner box K. It is converted into pushing force. As a result, in the packaging box 1, the gap between the short side 4 of the packaging box 1 and the inner box K is maintained even if you release the hand that pushed the short side 4 and the upper inner flap 41 away from the packaging box 1. be done.

Next, in the packaging box 1, insert your finger into the gap between the short side 4 of the packaging box 1 and the inner box K, and insert the finger from one short side of the inner box K through the abutting ends of the pair of outer flaps to the other side. Peel off the adhesive tape pasted to the end side, extend the outer flap and inner flap of the inner box K, open the upper closed part, and inspect the product inside.

Next, fold the inner and outer flaps, insert your finger into the gap between the short side 4 of the packaging box 1 and the inner box K, and remove the abutted ends of the pair of outer flaps from one short side of the inner box K. Paste the adhesive tape through the section to the side of the other end.

Next, the effects of the packaging box 1 according to this embodiment will be explained.

According to the packaging box 1 described above, even if you release the hand that pushed the short side 4 and the upper inner flap 41 in the direction away from the packaging box 1, there is still a gap between the short side 4 of the packaging box 1 and the inner box K. In order to maintain this, when a product is double-packed with inner box K and packaging box 1, if inner box K is opened while inner box K is inside packaging box 1 and the product is inspected. Later, when resealing the inner box K with adhesive tape, the adhesive tape can be easily peeled off from the short side of the inner box K or reattached.

In the packaging box 1, the flap valley fold line 8 is set to be long from the base end of the side edge of the upper inner flap 41 to the distal edge, so that the restoring force when folded can be strengthened, so that it is easy to handle. It is easy to maintain a wide gap even when released.

By the way, in the packaging box 1, the first flap valley fold line 81 is set to make an angle of about 40° with the upper inner flap fold line b. In other words, since the angle formed is less than 45 degrees, when the upper inner flap 41 is valley-folded at the flap valley fold line 8, (ignoring the three-dimensional deformation based on the V-shape of the flap valley fold line 8), ) The entire side edge of the upper inner flap 41 enters into the internal space of the packaging box 1. More specifically, if the upper inner flap 41 has a rectangular shape, the amount by which the side edge of the upper inner flap 41 enters into the internal space of the packaging box 1 becomes larger (wider) as it goes from the base end to the distal end.

However, in this case, the tip of the folded piece 43, which is the widest part, is originally locked to the inner box K, so the tip of the folded piece 43, which is pointed at a right angle, sticks into the inner box K. There is a risk of damaging the short side of the

On the other hand, since the upper inner flap 41 of the packaging box 1 has a chamfered portion 9 formed by cutting off the corner on the tip side, the folded piece 43 comes into line contact with the inner box K. Hard to damage inner box K.

In addition, in the packaging box 1, even if the flap valley fold line 8 is extended at an angle of slightly less than 45 degrees and set to be long in order to increase the restoring force, the flap will still be inserted into the internal space of the packaging box 1 (colliding with the inner box K). ) The size (distance from the flap valley fold line 8) of the folded piece 43 of the upper inner flap 41 can be adjusted.

In short, in the packaging box 1, the folding piece 43 can be adjusted to a size that barely collides with the inner box K when it is rotated, so it is possible to fold it back and lock it to the inner box K to create a gap. It's easy.

In addition, in the packaging box 1, as shown in FIG. 4, the flap valley fold line 8 is V-shaped, so unlike a straight line, it does not naturally bend, but is slightly forced to bend. can strengthen the resilience of Therefore, according to the packaging box 1, it is possible to generate a strong restoring force generated at the flap valley fold line 8, so that it is easy to maintain a wide gap even if the user releases the hand.

However, the crease line is generally formed in a straight line, so if it is a gentle arc, it will not work, and if it is bent into a V-shape, it will be difficult to bend it as intended when forced. It's easy to become. However, in the packaging box 1, the flap valley fold line 8 has a cut portion 83 at the part where the flap valley fold line 8 bends in a V-shape. It is easy to release the strain that occurs in the parts that are affected.

Therefore, according to the flap valley fold line 8 of the packaging box 1, even if it is V-shaped, it can be folded as intended.

[Modified example]
In the above-mentioned embodiment, 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.

In the above-mentioned embodiment, an example has been described in which the inner box K is housed inside the packaging box 1. However, if the folding piece 43 can be locked to the stored product, the product can be directly attached to the packaging box. 1 may be accommodated.

In the above-mentioned embodiment, the body part 2 is described as having a rectangular cylinder shape, but the body part only needs to have three or more side plates, so the body part 2 may have a triangular cylinder shape, a pentagonal cylinder shape, a hexagonal cylinder shape, etc. It's okay.

In the above-mentioned embodiment, the case where the body part 2 is constituted by a pair of short sides 4 and a pair of long sides 5 has been described as an example. There may be no distinction between the sides.

In the present embodiment, the upper open end of the trunk 2 is closed with a pair of upper inner flaps 41 and a pair of upper outer flaps 51, but in the present invention, the upper open end of the trunk 2 is closed with the upper inner flap 41 and the upper outer flap 51. Since it is sufficient to have one flap connected to a predetermined side plate, the packaging box of the present invention may be a B-type packaging box in which the upper open end of the body 2 is closed with one flap. .

In this embodiment, the lower open end of the trunk 2 has been described as being closed by the pair of lower inner flaps 42 and the pair of lower outer flaps 52, but the lower open end of the trunk 2 is The closing structure may be of any type, such as a bottom lock or an American lock.

In the present embodiment, the inclined crease line 7 is explained as extending from the center of the tip of the upper inner flap 41 in the width direction (horizontal direction in FIG. 2). As long as it extends from the middle part in the width direction, it does not have to be from the center part.

Although the present embodiment has been described using a straight line as the inclined fold line 7, the inclined fold line 7 may be slightly curved or bent.

In the present embodiment, the pair of inclined fold lines 7 are explained as an example in which two lines extend from one place in the widthwise center of the tip of the upper inner flap 41 and are formed in an inverted V shape. Two lines of sight 7 may extend from two locations spaced apart from each other in the widthwise middle portion of the tip of the upper inner flap 41 and may be formed in a V-shape.

In this embodiment, the upper inner flap 41 is provided with a pair of flap valley fold lines 8, but only one flap valley fold line 8 may be provided for the upper inner flap 41.

In the present embodiment, the flap valley fold line 8 is formed in a V-shape convexly bent in the direction approaching the adjacent inclined fold line 7. However, the flap valley fold line 8 It may be bent convexly in the direction away from the inclined fold line 7, it may be curved instead of bent, or it may be straight.

In the present embodiment, the flap valley fold line 8 has been described using as an example a line that connects the base end of the side edge of the upper inner flap 41 and the distal edge of the upper inner flap 41. It may extend from the middle part of the side edge, and further, if it can be valley-folded, it may extend from the side edge and tip part that are slightly away from the side edge and tip edge of the upper inner flap 41.

In the present embodiment, the flap valley fold line 8 has been described as having a cut portion 83 in the middle portion, but the cut portion may be omitted or may be additionally provided.

In this embodiment, the flap valley fold line 8 has been described as having an angle of about 40 degrees with the upper inner flap fold line b, but it may be 45 degrees or less. Furthermore, as long as the side edge of the inner flap 41 has a protrusion or the like that protrudes in a direction away from the side edge, the angle may be 45 degrees or more.

In the present embodiment, the upper inner flap 41 is provided with a chamfered portion 9 that has a substantially triangular shape cut off from the corner on the tip side of the upper inner flap 41, but the chamfered portion 9 The ridgeline may be arcuate or wavy, convex toward the corner, and the chamfered portion 9 may be omitted.

In the above embodiment, the adhesive tape is used as an example of a means for fixing the flap, but the means for fixing the flap may be an adhesive or a staple.

1 Packaging box 2 Body 3 Closure part (bottom)
4 Short side (side plate)
41 Upper inner flap (flap)
5 Long side (side plate)
7 Slanted crease line 8 Flap valley fold line 81 First flap valley fold line 82 Second flap valley fold line 83 Cut portion 9 Chamfered portion b Upper inner flap crease line (crease line)

Claims (7)

A rectangular cylindrical body consisting of three or more side plates,
a bottom portion closing a lower open end of the body;
a flap connected to the upper edge of at least one predetermined side plate via a fold line;
A packaging box comprising a pair of inclined fold lines connecting the widthwise intermediate portion of the tip of the flap and both corners of the lower end of the predetermined side plate. The packaging box according to claim 1,
The flap has a flap valley fold line formed outside the area sandwiched between the pair of inclined fold lines and extending from the side edge to the tip of the outer flap,
The packaging box is characterized in that the flap valley fold line is formed at a position where the flap is inserted into an internal space of the packaging box when the flap is folded back along the flap valley fold line. The packaging box according to claim 2,
The packaging box is characterized in that the flap valley fold line connects a base end of a side edge of the flap and a tip of the flap. In the packaging box according to claim 2 or 3,
The packaging box is characterized in that the flap valley fold line is convex in a direction approaching the adjacent inclined fold line or convex in a direction away from the adjacent inclined fold line. In the packaging box according to claim 2 or 3,
The flap valley fold line is
A V-shape bent convexly in a direction approaching the adjacent inclined fold line,
a first flap valley fold line extending linearly from a side edge of the flap toward the adjacent inclined fold line; and a second flap valley fold line extending linearly from the tip of the flap along the inclined fold line. A packaging box comprising: The packaging box according to claim 5,
The flap valley fold line is provided to connect the first flap valley fold line and the second flap valley fold line, and the flap valley fold line is provided so as to connect the first flap valley fold line and the second flap valley fold line, and the flap valley fold line extends from the tip of the first flap valley fold line along an extension line of the first flap valley fold line. A packaging box characterized by having a cut portion formed in a V-shape, having a portion extending to the fold line and a portion extending along the inclined fold line to the tip of the second flap valley fold line. The packaging box according to claim 2,
The flap valley fold line is formed to extend at an angle of less than 45° with respect to the proximal edge of the outer flap,
The packaging box is characterized in that the flap has a chamfered portion formed by cutting off a corner on the leading end side of the flap.

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