JP7542938B2 - Packaging box - Google Patents

Description

The present invention relates to a connectable packaging box.

A conventional packaging box that can be connected to multiple other boxes has a body made up of a pair of opposing first side panels and a second side panel that faces in a direction perpendicular to the direction in which the first side panels face each other, and a closing section that seals the upper and lower openings of the body, and has a connecting tongue in the center of the first side panel, with the upper base formed by a connecting fold line and the lower base and legs formed by slits (see, for example, Patent Document 1).

In the packaging box described in Patent Document 1, the first side panel of one packaging box is placed back-to-back with the first side panel of the other packaging box, and two corresponding connecting tongues are pushed into the inside of one packaging box, thereby connecting two adjacent packaging boxes.

JP 2002-068290 A

However, in the packaging box described in Patent Document 1, when a force is applied in a direction that pulls adjacent packaging boxes apart, the connecting tongue extends at the connecting fold line only due to the taper formed by the legs, and the connecting tongue may be pulled out of the opening formed by coming out of the other packaging box, resulting in insufficient connecting strength.

In view of the above, the present invention aims to provide a packaging box with high connection strength.

The packaging box of the present invention is a paper packaging box having a body portion consisting of a pair of opposing first side plates and a second side plate opposing in a direction intersecting the opposing direction of the first side plates, and a closing portion that seals the open end of the body portion, the closing portion having a first flap connected to the open end edge of the first side plate via a first fold line and a second flap connected to the open end edge of the second side plate via a second fold line, the first side plate and the first flap having a connecting fold line formed in the first side plate and a tongue breakable line that connects both ends of the connecting fold line and passes through the first flap beyond the first fold line. A connecting tongue is formed by the above, and the connecting tongue has a root portion having a length from a base end including the connecting fold line toward a tip end that is equal to or greater than the thickness of two sheets of paper, and a protruding portion protruding outward from the area sandwiched between a pair of imaginary perpendicular lines extending from both ends of the connecting fold line on the tip side of the root portion, and the second flap has a retaining portion that covers at least a part of the area surrounded by the outer edge of the tongue breakable line formed on the first flap when the first flap and the second flap are folded inwardly of the packaging box at the first fold line and the second fold line, respectively.

In the present invention, the first and second packaging boxes are arranged side by side with their connecting tongues back to back, and when this pair of connecting tongues is folded horizontally toward the inside of the second packaging box along the connecting fold line, the folded connecting tongue of the first packaging box is inserted into the connecting opening (the area surrounded by the tongue breakable line and the connecting fold line) formed in the first side panel and the first flap as the connecting tongue of the second packaging box is folded and comes out from the first side panel and first flap.

At this time, the connecting tongue has a root portion at its base end that is longer than the thickness of two sheets of paper, so that the root portion of the connecting tongue that has come out of the first packaging box is sandwiched in a position that corresponds to the root portion of the connecting opening formed in the second packaging box, and the protruding portion is positioned inside the second packaging box.

In this inserted state, the protruding portion of the connecting tongue of the first packaging box protrudes outward beyond the outer edge of the position corresponding to the base of the connecting opening of the second packaging box, so the connecting tongue of the first packaging box will not slip out of the connecting opening of the second packaging box.

Furthermore, when the second flap of the second packaging box is folded inwardly of the packaging box, the retaining portion covers a portion of the connecting opening of the second packaging box, so that a force is applied to the first and second packaging boxes in a direction that pulls them apart, and even if the connecting tongue rotates in a direction that extends along the connecting crease line, the connecting tongue can be prevented from passing through the connecting opening.

Therefore, the packaging box of the present invention can increase the connection strength.

In addition, the second side plate and the second flap are formed with a second connecting crease line formed in the second side plate and a second tongue breakable line that connects both ends of the second connecting crease line and passes through the second flap beyond the second crease line, and the second connecting tongue has a second root portion having a length of at least the thickness of two sheets of paper from a base end including the second connecting crease line toward a tip end, and a second protruding portion protruding outward from an area sandwiched between a pair of imaginary perpendicular lines extending from both ends of the second connecting crease line on the tip side of the second root portion, and the first flap preferably has a second holding portion that covers at least a part of the area surrounded by the outer edge of the second tongue breakable line formed in the second flap when the first flap and the second flap are folded inwardly of the packaging box at the first crease line and the second crease line, respectively.

With this configuration, in addition to connecting the first side plate of the first packaging box to the first side plate of the second packaging box, it is possible to connect the first side plate of the first packaging box to the second side plate of the second packaging box. This allows multiple packaging boxes to be connected in both the vertical and horizontal directions.

FIG. FIG. FIG. FIG. 4 is a perspective view showing two packaging boxes connected together. 13 is a perspective view showing the state in which the second top flap is closed after two packaging boxes are joined together. FIG. 11 is a perspective view showing a state in which the first and second top flaps are closed and engaged with each other after two packaging boxes are connected together; FIG. FIG. 11 is a development view showing a part of the packaging box of the second embodiment. FIG. 11 is a development view showing a part of the packaging box according to the third embodiment. FIG. 13 is a perspective view showing a state in which two packaging boxes of the third embodiment are connected together.

One embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the packaging box 1 of the first embodiment is formed in a rectangular box shape, with a rectangular cylindrical body 2, a top plate 3 (closed portion) and a bottom plate 4 that face each other. The packaging box 1 is used, for example, as a simple bed.

The torso 2 is formed into a rectangular tube shape with a second front plate 5, a first left side plate 6, a second rear side plate 7 and a first right side plate 8, with the second front plate 5 and the second rear side plate 7 (second side plate) facing each other and the first left side plate 6 and the first right side plate 8 (first side plate) facing each other.

As shown in FIG. 2, the packaging box 1 is assembled from corrugated cardboard 10 (paper) that has been punched into a roughly rectangular shape.

As shown in an expanded view in FIG. 2, the corrugated paperboard 10 has a rectangular second front panel 5 extending in the left-right and front-rear directions, and a rectangular first left side panel 6 is connected to the right edge of the second front panel 5 via a fold line L1, and an adhesive strip 11 is connected to the left edge of the second front panel 5 via a fold line L2. The adhesive strip 11 is adhered to the first right side panel 8.

The rectangular second rear panel 7 is connected to the right edge of the first left panel 6 via fold line L3, and the first right panel 8 is connected to the right edge of the second rear panel 7 via fold line L4.

The top panel 3 is composed of a pair of opposing second top flaps 3a, 3c (second flaps) and a pair of opposing first top flaps 3b, 3d (first flaps), and covers the entire upper opening surface of the body 2.

The second top flap 3a is connected to the upper edge (opening edge) of the second front panel 5 via the second fold line L5, and the first top flap 3b is connected to the upper edge of the first left side panel 6 via the first fold line L6.

The second top flap 3c is connected to the upper edge of the second rear panel 7 via the second fold line L7, and the first top flap 3d is connected to the upper edge of the first right side panel 8 via the first fold line L8.

Each of the top flaps 3a to 3d is folded inward along each of the fold lines L5 to L8, and as will be described in more detail below, each of the top flaps 3a to 3d is engaged with each other.

The bottom plate 4 has a second bottom flap 4a, a first bottom flap 4b, a second bottom flap 4c, and a first bottom flap 4d, with the second bottom flaps 4a and 4c facing each other and the first bottom flaps 4b and 4d facing each other. Each bottom flap 4a to 4d is engaged with each other so as to cover the entire bottom opening surface of the body 2. This improves the airtightness and rigidity of the packaging box 1.

The second bottom flap 4a is connected to the lower edge of the second front panel 5 via fold line L9, and the first bottom flap 4b is connected to the lower edge of the first left side panel 6 via fold line L10. The second bottom flap 4c is connected to the lower edge of the second rear panel 7 via fold line L11, and the first bottom flap 4d is connected to the lower edge of the first right side panel 8 via fold line L12. The bottom panel 4 does not necessarily have to be provided.

The bottom flaps 4a to 4d are folded along the fold lines L9 to L12, and the bottom flaps 4a to 4d are engaged with each other.

At the upper end of the second front side plate 5, a second tongue breakable line 21 is formed as a cut line. This second tongue breakable line 21 has a first front cut line formed in a shape obtained by rotating an approximately L-shape by 180 degrees, a second front cut line formed symmetrically with the first front cut line, and a third front cut line formed in a shape obtained by rotating an approximately U-shape by 90 degrees. Parts of the first and second front cut lines overlap the second fold line L5. In this embodiment, the breakable line, which is a cut line, is shown as a dotted line to clearly show that it is a line different from the fold line. Note that the breakable line in this embodiment may be any line that can be broken, and may be a break line formed by a number of linear discontinuous cuts, so-called perforations.

A second connecting fold line L14 is formed at the upper end of the second front panel 5, and this second connecting fold line L14 is divided by the above-mentioned third front cut line. The first and second front cut lines of the second tongue breakable line 21 are connected to both ends of the second connecting fold line L14 and extend upward.

A second tongue breakable line 22, which is a cut line, is formed at the lower end of the second upper surface flap 3a. This second tongue breakable line 22 has two first cut lines that extend upward continuously from the left and right ends of the second tongue breakable line 21, and a second cut line that connects the upper ends of the first cut lines. The center of the second cut line is formed in a semicircular arc. This semicircular arc portion is the portion against which the user presses his or her finger when folding the second connecting tongue 31, which is the inner portion of the second connecting fold line L14, the second tongue breakable line 21, and the second tongue breakable line 22, along the second connecting fold line L14.

Similarly, the first left side plate 6 is formed with a first tongue breakable line 23, which is a cut line, and a first connecting fold line L15, and the first top surface flap 3b is formed with a first tongue breakable line 24, which is a cut line.

Similarly, the second rear side panel 7 is formed with a second tongue breakable line 25, which is a cut line, and a second connecting fold line L16, and the second top surface flap 3c is formed with a second tongue breakable line 26, which is a cut line.

Similarly, the first right side plate 8 is formed with a first tongue breakable line 27, which is a cut line, and a first connecting fold line L17, and the first top surface flap 3d is formed with a first tongue breakable line 28, which is a cut line.

The second connecting crease line L14, the second tongue breakable line 21, and the second connecting tongue 31, which is the inner part of the second tongue breakable line 22, are composed of a second root portion 31a, which is the inner part of the second tongue breakable line 21 and has a length equal to or greater than the thickness of two sheets of corrugated paperboard 10, and a second protruding portion 31b, which is the inner part of the second tongue breakable line 22.

The second protruding portion 31b is formed so as to protrude outward from the area sandwiched between a pair of imaginary perpendicular lines (a pair of lines extending upward from both ends of the second connecting fold line L14 in FIG. 2) extending from both ends of the second connecting fold line L14 on the tip side of the second root portion 31a. In this embodiment, the second protruding portion 31b is formed to be wider than the second root portion 31a.

When the second connecting tongue 31 is folded along the second connecting fold line L14, a front opening 32a is formed in the second front side panel 5, and a second top opening 32b that is continuous with the front opening 32a and is wider than the front opening 32a is formed in the second top flap 3a (see Figure 1).

Similarly, as shown in FIG. 1, the first connecting tongue 33, which is the inner portion of the first connecting fold line L15, the first tongue breakable line 23, and the first tongue breakable line 24, is composed of a first root portion 33a and a first protruding portion 33b.

When the first connecting tongue 33 is folded along the first connecting fold line L15, a left side opening 34a is formed in the first left side plate 6, and a first top opening 34b is formed in the first top flap 3b.

Similarly, the second connecting fold line L16, the second tongue breakable line 25, and the second connecting tongue 35, which is the inner portion of the second tongue breakable line 26, are composed of a second root portion 35a and a second protruding portion 35b.

When the second connecting tongue 35 is folded along the second connecting fold line L16, a rear opening 36a is formed in the second rear side panel 7, and a second top opening 36b is formed in the second top flap 3c.

Similarly, the first connecting tongue 37, which is the inner portion of the first connecting fold line L17, the first tongue breakable line 27, and the first tongue breakable line 28, is composed of a first root portion 37a and a first protruding portion 37b.

When the first connecting tongue 37 is folded along the first connecting fold line L17, a right side opening 38a is formed in the first right side plate 8, and a first top opening 38b is formed in the first top flap 3d.

As shown in FIG. 2, the second top surface flap 3a has a left cut line 41 that extends downward from the top end and then to the left side, and a fold line L18 that extends from the left end of the left cut line 41 to the top end of the second top surface flap 3a.

In addition, the second upper surface flap 3a is formed with a right cut line 42 that extends downward from the upper end and then to the right side, and a fold line L19 that extends from the right end of the right cut line 42 to the upper end of the second upper surface flap 3a.

Similarly, the second top flap 3c has a left cut line 43, a fold line L20, a right cut line 44, and a fold line L21.

The first upper surface flap 3b has two notches 51 extending downward from the upper end, and the upper end portion of the first upper surface flap 3b is divided into three parts: the left end, the center, and the right end.

Similarly, the first upper surface flap 3d has two notches 52 extending downward from the upper end, and the upper end portion of the first upper surface flap 3d is divided into three parts: the left end, the center, and the right end.

Next, the process of connecting the first packaging box 1 and the second packaging box 1 will be described with reference to Figures 3 to 6.

First, as shown in FIG. 3, the top flaps 3a, 3c, and 3d of the first packaging box 1 are folded outward along the crease lines L5, L7, and L8, respectively, and the top flaps 3a to 3c of the second packaging box 1 are folded outward along the second crease lines L5 to L7, respectively.

Next, as shown in FIG. 4, the first connecting tongue 37 of the second packaging box 1 is folded inward along the first connecting crease line L17, while the first connecting tongue 33 of the first packaging box 1 is folded outward. In this case, the first connecting tongue 33 of the first packaging box 1 is folded along a line above the first connecting crease line L15 by the thickness of the first top flap 3b.

By this folding process, the first protruding portion 33b of the first connecting tongue 33 of the first packaging box 1 is inserted through the first top opening 38b of the first top flap 3d of the second packaging box 1. Furthermore, the first base portion 33a of the first packaging box 1 is inserted into the right side opening 38a of the first right side plate 8 of the second packaging box 1.

Next, as shown in FIG. 5, the second top flaps 3a and 3c of the first and second packaging boxes 1 are folded inward along the creases L5 and L7, respectively.

Then, as shown in FIG. 6, the first top flap 3b of the first packaging box 1 is folded along the first fold line L6, and the center portion of the upper end side of the first top flap 3b of the first packaging box 1 is inserted under the second top flaps 3a and 3c of the first packaging box 1.

In this embodiment, the portion surrounded by the right cut line 42 and fold line L19 of the second top flap 3a of the first packaging box 1 (hereinafter, the specified portion) can be folded inward along the fold line L19, and the specified portion surrounded by the left cut line 43 and fold line L20 of the second top flap 3c of the first packaging box 1 can be folded inward along the fold line L20.

Therefore, by inserting the center portion of the upper end side of the first top flap 3b of the first packaging box 1 into the opening formed by folding the above-mentioned predetermined portions of the second top flaps 3a, 3c of the first packaging box inward along the crease lines L19, L20, the center portion of the upper end side of the first top flap 3b of the first packaging box 1 is inserted under the second top flaps 3a, 3c of the first packaging box 1.

Similarly, the first top flap 3d of the first packaging box 1 is folded inward along the first fold line L8, and the center portion of the upper end side of the first top flap 3d of the first packaging box 1 is inserted under the second top flaps 3a, 3c of the first packaging box 1. Note that the second top flaps 3a, 3c may be folded after folding the first top flaps 3b, 3d, and the folding order is not limited.

Similarly, insert the center portion of the upper end side of the first top surface flaps 3b and 3d of the second packaging box 1 under the second top surface flaps 3a and 3c of the second packaging box 1.

As a result, the top flaps 3a to 3d of the first and second packaging boxes 1 engage with each other, closing the top opening of the packaging box 1 and further improving the airtightness and rigidity of the packaging box 1.

In this embodiment, the first connecting tongue 37 of the second packaging box 1 has a first root portion 37a at its base end that has a length equal to or greater than the thickness of two sheets of corrugated paperboard 10, so that the first root portion 33a of the first connecting tongue 33 protruding from the first packaging box 1 is sandwiched in the right side opening 38a formed in the second packaging box 1, and the first protruding portion 33b is positioned inside the second packaging box 1.

In this inserted state, the first protruding portion 33b of the first connecting tongue 33 of the first packaging box 1 protrudes outward beyond the outer edge of the right side opening 38a of the second packaging box 1, so that the first connecting tongue 33 of the first packaging box 1 does not slip out of the right side opening 38a and the first top opening 38b of the second packaging box 1.

Furthermore, when the second top flaps 3a, 3c of the second packaging box 1 are folded inwardly of the packaging box 1, a portion (first retaining portion) of the second top flaps 3a, 3c of the second packaging box 1 covers a portion of the right side opening 38a and the first top opening 38b of the second packaging box 1. This prevents the first connecting tongue 33 of the first packaging box 1 from passing through the right side opening 38a and the first top opening 38b of the second packaging box 1 even if a force is applied to the first and second packaging boxes 1 in a pulling direction and the first connecting tongue 33 of the first packaging box 1 rotates in a direction extending along the first connecting fold line L15.

Therefore, according to the present invention, it is possible to increase the connection strength.

The packaging box 1 of the present invention has similar connecting tongues on each of the side panels 5-8 and each of the top flaps 3a-3d, so that it can be connected to another packaging box 1 on all four sides.

Therefore, by increasing the number of packaging boxes 1 to be connected, for example, by connecting 10 packaging boxes 1 (for example, 5 vertically and 2 horizontally, for a total of 10), it can be used as a simple bed.

In the above embodiment, the second protrusion 31b is formed to be wider than the second root portion 31a, thereby satisfying the condition that the second protrusion 31b protrudes outward from the area sandwiched between a pair of imaginary perpendicular lines extending from both ends of the second connecting fold line L14 to the tip side of the second root portion 31a (a pair of lines extending upward from both ends of the second connecting fold line L14 in FIG. 2). However, as long as the above condition is satisfied, the shape of the second connecting tongue 31 can be changed as appropriate.

For example, as in the second embodiment shown in FIG. 7, the second connecting fold line L14 may be inclined with respect to the horizontal direction in the figure, and a second tongue piece breakable line 21 and a second tongue piece breakable line 22 may be formed from both ends of this inclined second connecting fold line L14, passing over the second fold line L5 and passing through the second upper surface flap 3a, so that the second connecting fold line L14, the second tongue piece breakable line 21, and the second tongue piece breakable line 22 form the second connecting tongue piece 31.

In this second embodiment, the second protruding portion 31b is also formed so as to protrude outward beyond the area sandwiched between a pair of imaginary perpendicular lines (a pair of two-dot chain lines in FIG. 7) extending from both ends of the second connecting fold line L14 on the tip side of the second root portion 31a.

8 and 9, the first tongue breakable line 28 may be formed on the first right side plate 8 and the first top flap 3b so as to extend upward from the upper end of the first tongue breakable line 27, and the first connecting tongue 37 may be formed into an inverted U-shape by mirror-matching the inverted L-shape. In this case, the first connecting tongue 37 has a notch 37c formed therein, and the first right side plate 8 has an erected portion 8a formed therein for forming the notch 37c.

Similarly, the first connecting tongue 33 formed on the first left side plate 6 and the first top flap 3b is formed into an inverted U-shape by mirror-matching the inverted L-shape. In this case, a notch 33c is formed in the first connecting tongue 33, and an erected portion 6a for forming the notch 33c is formed in the first left side plate 6. The second connecting tongues 31, 35 are also formed in the same shape as the first connecting tongues 33, 37.

When the first connecting tongue 33 of the first packaging box 1 and the first connecting tongue 37 of the second packaging box 1 are folded as shown in FIG. 9, the erected portion 8a of the second packaging box 1 is inserted into the notch 33a of the first packaging box 1. This connects the first packaging box 1 and the second packaging box 1. It is preferable to also form the above structure on the second front panel 5 and the second top flap 3a, and the second rear panel 7 and the second top flap 3c.

In the above embodiment, the packaging box 1 is made of corrugated paperboard 10, but it may be made of paper, resin, metal, etc.

In addition, in the above embodiment, the first and second side panels and the first and second top flaps are each provided with a connecting tongue, but the present invention can be implemented by forming a connecting tongue on one of the side panels and top flaps.

In addition, in the above embodiment, the connecting tongue is formed on the top flap, but the connecting tongue may be formed on the bottom flap.

1...packaging box, 2...body portion, 3...top panel (closing portion), 3a, 3c...second top flap (second flap), 3b, 3d...first top flap (first flap), 4...bottom panel, 5...second front panel (second side panel), 6...first left side panel (first side panel), 7...second rear panel (second side panel), 8...first right side panel (first side panel), 10...corrugated cardboard (paper), 21, 22, 25, 26...second tongue breakable line , L14, L16... second connecting fold line, 23, 24, 27, 28... first tongue breakable line, 31, 35... second connecting tongue, 31a, 35a... second root portion, 31b, 35b... second protruding portion, 33, 37... first connecting tongue, 33a, 37a... first root portion, 33b, 37b... first protruding portion, L5, L7... second fold line, L6, L8... first fold line, L15, L17... first connecting fold line

Claims (2)

A packaging box is assembled from paperboard that can be joined together and includes a body portion having a pair of opposing first side panels and a second side panel that faces in a direction intersecting the opposing direction of the first side panels, and a closing portion that seals an open end of the body portion, the packaging box comprising :
the closing portion has a first flap connected to an opening edge of the first side panel via a first fold line, and a second flap connected to an opening edge of the second side panel via a second fold line;
A first connecting tongue is formed in the first side panel and the first flap by a first connecting fold line formed in the first side panel and a first tongue breakable line connecting both ends of the first connecting fold line and passing through the first flap beyond the first fold line,
the first connecting tongue piece has a first root portion having a length from a base end including the first connecting fold line toward a tip end that is equal to or greater than the thickness of two sheets of the paperboard , and a first protruding portion protruding outward from a region sandwiched between a pair of imaginary perpendicular lines extending from both ends of the first connecting fold line on the tip side of the first root portion,
the first side plate on which the first connecting tongue of one packaging box is formed and the first side plate on which the first connecting tongue of the other packaging box is formed are arranged back to back, and the pair of first connecting tongues are folded horizontally toward the inside of the other packaging box along the respective first connecting creases, so that the folded first connecting tongue of the one packaging box is inserted into a connecting opening formed in the first side plate and the first flap as the first connecting tongue of the other packaging box is folded and comes out of the first side plate and the first flap, and the first root portion of the first connecting tongue that has come out of the one packaging box is sandwiched in a position corresponding to the first root portion of the connecting opening formed in the other packaging box, and the first protruding portion is disposed inward of the other packaging box,
a first retaining portion that closes the connecting opening formed in the first flap from below when the second flap of the other packaging box is folded inwardly into the packaging box at the second fold line and then the first flap is folded inwardly into the packaging box at the first fold line to be overlapped with the outer surface of the second flap. The packaging box according to claim 1,
A packaging box, wherein the first connecting tongue piece is formed on each of the combinations of the first side panel and the first flap.