Packing box

Abstract

To provide a packing box which is excellent in commodity display property and hardly reduces its strength even when a large load or impact is applied at the time of transportation of a commodity.SOLUTION: A packing box 1 comprises front, rear, left, and right side plates 11 to 14, a top plate 20, and a bottom plate 30. The packing box has a front breakage guide line L21 formed at a front edge of the top plate 20, a left breakage guide line L22 formed at a left edge of the top plate 20, a right breakage guide line L22 formed at a right edge of the top plate 20, a rear side breaking guide line L24 formed at a rear edge of a top plate 20, and a breakage starting part 25 formed on the top plate 20 and serving as a starting point of the breakage of the front breakage guide line L21, and thereby the top plate can be cut off from the front, rear, left, and right side plates 11 to 14. The top plate 20 can have a signboard on an upper side of a side plate 12 of a rear side by inserting an upper edge of the side plate 12 of the rear side between one of the upper outer flaps 21 and the left and right upper inner flaps 22 and 22.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] BACKGROUND ART Conventionally, packaging boxes are known that are used as transport boxes when transporting products and also used when displaying products in stores (see, for example, Patent Document 1). The packaging box of Patent Document 1 is made of cardboard, and by cutting off the opening portion from the side panel to the top panel, the product can be displayed as is. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-15528 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional packaging box described above, the break guide line for separating the opening portion formed on the top plate is also formed on the side plate. Therefore, there is a risk that the break guide line may be broken unintentionally due to the load or impact acting on the packaging box during product transportation, etc., thereby reducing the strength of the packaging box.

[0005] The present invention aims to solve the above-mentioned problems and to provide a packaging box that is excellent in product display properties and is resistant to deterioration in strength even when subjected to large loads or impacts during product transportation, etc. [Means for solving the problem]

[0006] To solve the above problem, the present invention provides a packaging box comprising front, rear, left, and right side panels, a top panel connected to the upper edges of the front, rear, left, and right side panels, and a bottom panel connected to the lower edges of the front, rear, left, and right side panels. The packaging box comprises a front break guide line formed on the front edge of the top panel, a left break guide line formed on the left edge of the top panel, a right break guide line formed on the right edge of the top panel, a rear break guide line formed on the rear edge of the top panel, and a break initiation portion formed on the top panel that serves as a break initiation portion of the front break guide line. The top panel comprises front and rear upper outer flaps connected to the upper edges of the front and rear side panels, and left and right upper inner flaps connected to the upper edges of the left and right side panels and overlapping the undersides of the front and rear upper outer flaps. The tear initiation portion is formed with folding guide lines at the left and right corners of the front portion of the front upper outer flap. The folding guide line of the left tear initiation portion extends obliquely from the left edge to the front edge of the front upper outer flap, with its front end connected to the front folding guide line. The folding guide line of the right tear initiation portion extends obliquely from the right edge to the front edge of the front upper outer flap, with its front end connected to the front folding guide line. The left and right upper inner flaps are formed with folding guide lines for the left and right upper inner flaps that form part of the tear initiation portion at positions corresponding to the folding guide line of the front upper outer flap. The folding guide line of the upper outer flap and the folding guide lines for the left and right upper inner flaps overlap in the vertical direction. The top plate is formed by dividing the front breakage guide line, the left breakage guide line, the right breakage guide line, and the right breakage guide line into two parts, starting from the breakage initiation portion. influence The top plate can be separated from the front, rear, left, and right side panels by breaking the rear break guide wires. The separated top plate is connected to the upper edge of the rear side panel by inserting the upper edge of the rear side panel between one of the front and rear upper outer flaps and the left and right upper inner flaps, thereby forming a signboard above the rear side panel.

[0007] In the packaging box of the present invention, when the top plate is pulled up with the fingers starting from the tear initiation point, the front tear guide line is cut open, followed by the left and right tear guide lines, and then the rear tear guide line. This separates the top plate from the front, rear, left, and right side plates. The space between one of the front and rear upper outer flaps and the left and right upper inner flaps of the separated top plate is then widened to approach the upper edge of the rear side plate, and the upper edge of the rear side plate is inserted between them. This allows the separated top plate to be used as a display sign, providing excellent product displayability. The packaging box of the present invention has a break initiation portion on the top plate, which serves as the starting point for breaking. Furthermore, front, left, right, and rear break guide lines for cutting open the top plate are formed on the front, left, right, and rear edges of the top plate. Therefore, the strength of the packaging box can be ensured compared to when break initiation portions and break guide lines for opening the top plate are formed within the surfaces of the front, rear, left, and right side plates. This makes it less likely for the strength of the packaging box to decrease even when subjected to large loads or impacts during product transportation, etc.

[0008] The packaging box of the present invention includes front, rear, left, and right side panels, a top panel connected to the upper edges of the front, rear, left, and right side panels, and a bottom panel connected to the lower edges of the front, rear, left, and right side panels. The packaging box also includes a front break guide line formed on the front edge of the top panel, a left break guide line formed on the left edge of the top panel, a right break guide line formed on the right edge of the top panel, a break initiation portion formed on the top panel that serves as a break initiation portion of the front break guide line, and top panel bending guide lines extending parallel to the left and right edges of the top panel within the plane of the top panel for bending the top panel left and right. The rear edge of the top panel is connected to the rear side panel by being adhered to a strip-shaped joining piece connected to the upper edge of the rear side panel. The top plate can be separated from the front, rear, left, and right side plates by breaking the front break guide wire, the left break guide wire, and the right break guide wire starting from the break initiation point and peeling the rear edge of the top plate from the joining piece. The separated top plate is inserted into the inside of the rear side plate through the upper openings of the front, rear, left, and right side plates in a state where it is folded along the top plate bending guide wire, forming a signboard above the rear side plate.

[0009] In the packaging box of the present invention, when the top plate is pulled up with the fingers starting from the tear initiation point, the front break guide line, as well as the left and right break guide lines, are cut open. The rear edge of the top plate is then peeled away from the joining piece of the rear side plate, separating the top plate from the front, rear, left, and right side plates. The separated top plate is then folded along the top bending guide line, and the lower part of the top plate is inserted into the upper inside of the rear side plate through the upper openings of the front, rear, left, and right side plates. The restoring force of the folded top plate causes the left and right edges of the top plate to press against the inner surfaces of the left and right side plates, holding the top plate against the front inside of the rear side plate. This allows the separated top plate to be used as a display sign, providing excellent product displayability. The packaging box of the present invention has a tear initiation portion on the top plate, which serves as the starting point for tearing. Furthermore, front, left, and right tear guide lines for cutting open the top plate are formed on the front, left, and right edges of the top plate. Therefore, the strength of the packaging box can be ensured compared to when tear initiation portions and tear guide lines for opening the top plate are formed within the surfaces of the front, rear, left, and right side plates. This makes it less likely for the strength of the packaging box to decrease even when subjected to large loads or impacts during product transportation, etc. [Effects of the Invention]

[0010] The packaging box of the present invention is excellent in terms of product displayability and is resistant to deterioration in strength even when subjected to a large load or impact during product transportation, etc. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a packaging box according to a first embodiment of the present invention. [Figure 2] 1 is a diagram showing a blank sheet for a packaging box according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view showing a state when the packaging box according to the first embodiment of the present invention is opened. [Figure 4] 1 is a perspective view showing a procedure for using the top plate of the packaging box according to the first embodiment of the present invention as a signboard. FIG. [Figure 5]1 is a perspective view showing a state in which the top plate of the packaging box according to the first embodiment of the present invention is attached to the rear side plate and used as a signboard. FIG. [Figure 6] FIG. 10 is a perspective view showing a packaging box according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a diagram showing a blank sheet for a packaging box according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view showing a state when the packaging box according to the second embodiment of the present invention is opened. [Figure 9] 10A and 10B are perspective views showing a procedure for using the top plate of the packaging box according to the second embodiment of the present invention as a signboard. [Figure 10] FIG. 10 is a perspective view showing a state in which the top plate of the packaging box according to the second embodiment of the present invention is attached to the upper front side of the rear side plate and used as a signboard. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, back, left, and right directions are set for the convenience of describing the packaging box of each embodiment, and do not limit the configuration of the packaging box of the present invention. Note that in each embodiment, the same parts are given the same reference numerals, and detailed descriptions will be omitted.

[0013] (First embodiment) As shown in Figures 1 and 2, the packaging box 1 of this embodiment is an A-type box and has a rectangular parallelepiped shape with a greater length in the left-right direction than in the front-to-back direction. The packaging box 1 includes a bottom plate 30, side plates 11-14 connected to the front, rear, left, and right edges of the bottom plate 30, and a top plate 20 facing the bottom plate 30 and closing the upper openings of the front, rear, left, and right side plates 11-14. The front, rear, left, and right side plates 11-14 form a rectangular cylindrical body 5. The packaging box 1 is used as a shipping box for transporting products, and, as described below, can also be used as a box for displaying products in stores by opening the top plate 20. When displaying products, the top plate 20 can be detached and used as a signboard.

[0014] The packaging box 1 is formed by mountain or valley folding a blank sheet S1 cut out from a single sheet of cardboard, along each of the creases, as shown in Fig. 2. The blank sheet S1 shown in Fig. 2 is arranged so that the outer surface is visible, but for ease of explanation, the creases formed on the inner surface are shown as solid lines. Each crease (fold line) on the blank sheet S1 is a linear groove (pressed crease) formed by pressing the surface of the blank sheet S1. Note that notches (half-cut lines, etc.) may be formed on the crease. This makes it easier to fold the blank sheet S1 at the crease.

[0015] 1, the body 5 includes a pair of front and rear side plates 11, 12 and a pair of left and right side plates 13, 14. The front side plate 11, the rear side plate 12, the left side plate 13, and the right side plate 14 are each a rectangular plate. A left side plate 13 is connected to the left edge of the front side plate 11 via a crease. A right side plate 14 is connected to the right edge of the front side plate 11 via a crease. A rear side plate 12 is connected to the rear edge of the right side plate 14 via a crease. A strip-shaped joint piece 16 is connected to the left edge of the rear side plate 12 via a crease. The joint piece 16 is bonded to the inner surface of the left side plate 13 by an adhesive such as hot melt.

[0016] Then, when the blank sheet S1 (see FIG. 2) is folded along each of the lines, the front plate 11, rear plate 12, left plate 13, and right plate 14 form a rectangular cylindrical body portion 5. The left and right side plates 13, 14 are formed with handholds 7, 7.

[0017] Side panel opening start portions 11a, 12a are formed in the approximate centers of the front side panel 11 and the rear side panel 12. The side panel opening start portions 11a, 12a are the starting points when the body portion 5 is divided into two parts in the vertical direction and opened. Each side panel opening start portion 11a, 12a is formed by a linear slit.

[0018] A tear strip 6 is attached to the body 5 so as to intersect with the side panel tear start portions 11a, 12a. The tear strip 6 is provided linearly on the inner surface of the body 5 along the entire circumferential direction of the body 5 (see FIG. 2). The tear strip 6 is parallel to the upper and lower edges of the body 5.

[0019] As shown in Figure 1, the top plate 20 closes the upper opening of the body 5. The left and right corners of the front side of the top plate 20 are formed with break initiation points 25, 25, which serve as break initiation points. A front break guide line L21 is formed along the entire length of the front edge of the top plate 20, and left and right break guide lines L22 and L22 are formed along the entire length of the left and right edges of the top plate 20. Furthermore, a rear break guide line L24 is formed along the entire length of the rear edge of the top plate 20. The top plate 20 is designed to be cut open from the body 5 by these front break guide line L21, left break guide line L22, right break guide line L22, and rear break guide line L24 when opened.

[0020] The top plate 20 has a pair of front and rear upper outer flaps 21, 21 connected to the upper edges of the front plate 11 and the rear plate 12, and a pair of left and right upper inner flaps 22, 22 connected to the upper edges of the left plate 13 and the right plate 14. The left and right upper inner flaps 22, 22 are overlapped on the undersides (inner surfaces) of the front and rear upper outer flaps 21, 21, and are efficiently partially bonded to the front and rear upper outer flaps 21, 21 with an adhesive such as hot melt.

[0021] The front upper outer flap 21 is a rectangular flat plate that extends rearward from the upper edge of the front plate 11. The front upper outer flap 21 closes the front half of the upper opening of the body 5. The rear upper outer flap 21 is a rectangular flat plate that extends forward from the upper edge of the rear plate 12. The rear upper outer flap 21 closes the rear half of the upper opening of the body 5. The tips of the front and rear upper outer flaps 21, 21 butt against each other at the center of the top plate 20 in the fore-and-aft direction.

[0022] The front upper outer flap 21 is connected to the upper edge of the front plate 11 via a front break guide line L21. The front break guide line L21 is for separating the front upper outer flap 21 from the front plate 11, and is formed along the entire upper edge of the front plate 11 (the front edge of the front upper outer flap 21). The front break guide line L21 is a perforated line with intermittent slits. The spacing and shape of the slits in the front break guide line L21 are not limited.

[0023] The rear upper outer flap 21 is connected to the upper edge of the rear panel 12 via a rear break guide line L24. The rear break guide line L24 is for separating the rear upper outer flap 21 from the rear panel 12, and is formed along the entire upper edge of the rear panel 12 (the rear edge of the rear upper outer flap 21). The rear break guide line L24 is a perforated line with intermittent slits. The spacing and shape of the slits in the rear break guide line L24 are not limited.

[0024] The tear initiation portions 25, 25 of the front upper outer flaps 21 are provided with fold guide lines L25, L25. The fold guide lines L25, L25 are linear grooves (pressed creases) formed by pressing into the surfaces (inner surfaces) of the upper outer flaps 21, 21. The fold guide lines L25, L25 have slits formed at intervals.

[0025] The fold guide line L25 of the left breaking initiation portion 25 extends obliquely from the left edge to the front edge of the upper outer flap 21, and its front end is connected to the front breaking guide line L21. The fold guide line L25 of the right breaking initiation portion 25 extends obliquely from the right edge to the front edge of the upper outer flap 21, and its front end is connected to the front breaking guide line L21.

[0026] Next, the left and right upper inner flaps 22, 22 will be described. The left upper inner flap 22 is a rectangular flat plate that extends rightward from the upper edge of the left side panel 13. The left upper inner flap 22 partially covers the left side of the upper opening of the body 5. The left upper inner flap 22 is connected to the upper edge of the left side plate 13 via a left breaking guide line L22. The left breaking guide line L22 is for separating the upper inner flap 22 from the left side plate 13, and is formed over the entire length of the upper edge of the left side plate 13 (the left edge of the left upper inner flap 22). The left breaking guide line L22 is a perforated line with intermittent slits. The spacing and shape of the slits of the left breaking guide line L22 are not limited.

[0027] The right upper inner flap 22 is a rectangular flat plate that extends leftward from the upper edge of the right side panel 14. The right upper inner flap 22 partially covers the right side of the upper opening of the body 5. The right upper inner flap 22 is connected to the upper edge of the right side plate 14 via a right breaking guide line L22. The right breaking guide line L22 is for separating the right upper inner flap 22 from the right side plate 14, and is formed along the entire length of the upper edge of the right side plate 14 (the right edge of the right upper inner flap 22). The right breaking guide line L22 is a perforated line with intermittent slits. The spacing and shape of the slits in the right breaking guide line L22 are not limited.

[0028] The left and right upper inner flaps 22 have fold guide lines L23, L23 that form part of the tear initiation portions 25, 25, formed at positions corresponding to the fold guide lines L25, L25 of the front upper outer flap 21. The fold guide lines L23, L23 are linear grooves (pressed creases) formed by pressing the surfaces (inner surfaces) of the upper inner flaps 22, 22. The fold guide lines L23, L23 have slits formed at intervals.

[0029] The folding guide line L23 of the left upper inner flap 22 extends obliquely from the left edge to the front edge of the left upper inner flap 22. The folding guide line L23 of the right upper inner flap 22 extends obliquely from the right edge to the front edge of the right upper inner flap 22.

[0030] The folding guide lines L25, L25 of the upper outer flap 21 and the folding guide lines L23, L23 of the upper inner flaps 22, 22 overlap in the vertical direction. As a result, when the top plate 20, which will be described later, is opened, the front upper outer flap 21 and the left and right upper inner flaps 22 can be folded in an overlapping state at the left and right tear initiation portions 25, 25, respectively.

[0031] The bottom plate 30 closes the lower opening of the body 5. The bottom plate 30 includes a pair of front and rear lower outer flaps 31, 31 connected to the lower edge portions of the front plate 11 and the rear plate 12, and a pair of left and right lower inner flaps 32, 32 connected to the lower edge portions of the left plate 13 and the right plate 14. The left and right lower inner flaps 32, 32 are placed on the upper surfaces (inner surfaces) of the front and rear lower outer flaps 31, 31, and are bonded to the front and rear lower outer flaps 31, 31 with an adhesive such as hot melt.

[0032] The front lower outer flap 31 is a rectangular flat plate that extends rearward from the lower edge of the front panel 11. The front lower outer flap 31 closes the front half of the lower opening of the body 5. The rear lower outer flap 31 is a rectangular flat plate that extends forward from the lower edge of the rear plate 12. The rear lower outer flap 31 closes the rear half of the lower opening of the body 5. The tips of the front and rear lower outer flaps 31, 31 butt against each other in the center of the bottom plate 30 in the fore-and-aft direction.

[0033] The left lower inner flap 32 is a rectangular flat plate that extends rightward from the lower edge of the left side panel 13. This left lower inner flap 32 partially covers the left side of the lower opening of the body 5. The right lower inner flap 32 is a rectangular flat plate that extends leftward from the lower edge of the right side panel 14. This right lower inner flap 32 partially covers the right side of the lower opening of the body 5.

[0034] When contents are accommodated in the packaging box 1 of this embodiment and transported or stored, the packaging box 1 is placed so that the top plate 20 faces upward, similar to a typical A-type cardboard box. When opening the packaging box 1, as shown in Fig. 3, the worker presses the tear initiation portions 25, 25 of the top plate 20 with his or her fingers, and then grasps both front corners of the top plate 20 with his or her fingers and pulls it upward. This causes the front tear guide line L21 to be cut open, and the left and right tear guide lines L22 and L22 to be cut open. Following the cutting open of the left and right tear guide lines L22 and L22, the rear tear guide line L24 is cut open. This separates the entire top plate 20 from the front, rear, left, and right side plates 11-14 (shown by the two-dot chain lines in Fig. 3).

[0035] 4, the top plate 20 is brought close to the upper edge of the rear side panel 12 with the surface of the separated top plate 20 (the printed surface of the product, etc.) facing forward and both tear initiation portions 25, 25 facing downward. Then, the upper edge of the rear side panel 12 is inserted between the upper outer flap 21 located below the top plate 20 and the left and right upper inner flaps 22, 22. This holds the top plate 20 so that it stands up from the upper edge of the rear side panel 12.

[0036] In the packaging box 1 of this embodiment described above, the separated top plate 20 can be used as a display sign. This provides excellent product displayability. Furthermore, the top plate 20 is resistant to tipping and has strength because the upper edge of the rear side plate 12 is inserted between the upper outer flap 21 and the left and right upper inner flaps 22, 22. The depth of insertion into the rear side plate 12 can be adjusted by adjusting the adhesive position of the hot melt that bonds the upper outer flap 21 to the left and right upper inner flaps 22, 22.

[0037] Furthermore, the packaging box 1 of this embodiment has tear initiation portions 25, 25 formed on the top plate 20, which serve as tear starting points. Furthermore, front tear guide line L21, left tear guide line L22, right tear guide line L22, and rear tear guide line L24 for cutting open the top plate 20 are formed on the front, left, right, and rear edges of the top plate 20. Therefore, the strength of the packaging box 1 can be ensured compared to when tear initiation portions and tear guide lines for opening the top plate are formed within the surfaces of the front, rear, left, and right side plates 11 to 14. As a result, the strength of the packaging box 1 is less likely to decrease even when a large load or impact is applied during product transportation, etc.

[0038] (Second embodiment) Next, a packaging box according to a second embodiment of the present invention will be described with reference to Figures 6 to 10. Figure 6 is a perspective view showing the packaging box according to the second embodiment of the present invention, and Figure 7 is a diagram showing a blank sheet for the packaging box according to the second embodiment of the present invention. In this embodiment, the present invention is applied to a wrap-around type packaging box 1A.

[0039] 6, the packaging box 1A is a rectangular parallelepiped whose length in the left-right direction is greater than that in the front-to-rear direction. The packaging box 1A includes a bottom plate 51, a pair of front and rear side plates 53, 54, a pair of left and right side plates 60, 70, and a top plate 52.

[0040] The packaging box 1A is formed by mountain-folding or valley-folding a blank sheet S2 cut out from a single sheet of cardboard at each of the ruled lines, as shown in Fig. 7. The blank sheet S2 shown in Fig. 7 is arranged so that the outer surface is visible, but for ease of explanation, the ruled lines formed on the inner surface are shown as solid lines. Each crease (fold line) on the blank sheet S2 is a linear groove (pressed crease) formed by pressing the surface of the blank sheet S2. Note that notches (half-cut lines, etc.) may be formed on the crease lines, which makes it easier to fold the blank sheet S2 at the crease lines.

[0041] As shown in Fig. 6, the bottom plate 51 is a rectangular flat plate. A front side plate 53 is connected to the front edge of the bottom plate 51 via a score line, and a rear side plate 54 is connected to the rear edge of the bottom plate 51 via a score line. The front plate 53 and the rear plate 54 are the same rectangular flat plates and are formed perpendicular to the bottom plate 51 .

[0042] The top plate 52 is connected to the upper edge of the front plate 53 via a front breakage guide line L21. The top plate 52 is a rectangular flat plate like the bottom plate 51, and is formed perpendicular to the rear plate 54. In this embodiment, the front breakage guide line L21 is also formed over the entire length of the upper edge of the front plate 53 (the front edge of the top plate 52).

[0043] A joining piece 56 is connected to the upper edge of the rear plate 54 via a score line. The joining piece 56 is a strip-shaped plate formed along the upper edge of the rear plate 54. The joining piece 56 is joined to the inner surface of the rear edge of the top plate 52 by an adhesive such as hot melt.

[0044] The left side plate 60 includes a pair of upper and lower outer flaps 61, 62 connected to the left edges of the bottom plate 51 and the top plate 52, respectively, and a pair of front and rear inner flaps 63, 64 connected to the left edges of the front plate 53 and the rear plate 54, respectively. The upper outer flap 62 is attached to the left edge of the top plate 52 via a left breakage guide line L22. The left side panel 60 has outer flaps 61 and 62 superimposed on the outer surfaces of inner flaps 63 and 64 and integrally joined together with an adhesive.

[0045] The right side plate 70 includes a pair of upper and lower outer flaps 71, 72 connected to the right edges of the bottom plate 51 and the top plate 52, respectively, and a pair of front and rear inner flaps 73, 74 connected to the right edges of the front plate 53 and the rear plate 54, respectively. The upper outer flap 72 is attached to the right edge of the top plate 52 via a right break guide line L22. The right side panel 70 has outer flaps 71 and 72 superimposed on the outer surfaces of inner flaps 73 and 74 and integrally joined together with an adhesive.

[0046] Note that handles 7, 7 are formed on the upper rear part of the left side panel 60 and the upper front part of the right side panel 70. A tear strip 6 is attached from the front panel 53 to the left and right inner flaps 63, 73. Similarly, a tear strip 6 is attached from the rear panel 54 to the left and right inner flaps 64, 74.

[0047] The top plate 52 has break initiation portions 25, 25, a front break guide wire L21, a left break guide wire L22, and a right break guide wire L22. That is, the top plate 52 can be opened by cutting open the front break guide wire L21, the left break guide wire L22, and the right break guide wire L22, using the break initiation portions 25, 25 as the break initiation point. The top plate 52 can also be separated by peeling the rear edge of the top plate 52 away from the joining piece 56 of the rear side plate 54.

[0048] A top plate folding guide line 57 is formed on the inner surface of the top plate 52. The top plate folding guide line 57 is a crease formed across the front and rear edges in the left-right center of the top plate 52. Score lines are formed at intervals on the top plate folding guide line 57.

[0049] When the packaging box 1A of this embodiment is to be transported or stored with contents placed therein, the packaging box 1A is placed with the top plate 52 facing upward, similar to a typical wrap-around cardboard box (see FIG. 6). To open the packaging box 1A, as shown in Figure 8, the worker presses the tear initiation portions 25, 25 of the top plate 52 with his or her fingers, then grasps both front corners of the top plate 52 with his or her fingers and pulls it upward. This cuts open the front tear guide line L21, and also the left tear guide line L22 and the right tear guide line L22. The rear edge of the top plate 20 is then peeled away from the joining piece 56 of the rear side plate 54. This separates the entire top plate 20 (shown by the two-dot chain line in Figure 8). By separating the top plate 20 in this manner, an upper opening 80 is formed at the top of the packaging box 1A.

[0050] 9, the surface of the separated top plate 52 (the printed surface of the product, etc.) is faced forward, and both tear initiation portions 25, 25 are faced downward. Then, the top plate 52 is folded along the top plate folding guide line 57.

[0051] Thereafter, the top plate 52 is brought close to the upper edge of the rear plate 54, and the lower part of the top plate 52 is inserted into the front side of the rear plate 54 through the upper opening 80. Then, due to the restoring force of the top plate 52, the left and right edges of the top plate 52 press against the inner surfaces of the left plate 60 and the right plate 70, and the top plate 52 is held inside the front of the rear plate 54.

[0052] In the packaging box 1A of this embodiment described above, the separated top plate 52 can also be used as a display sign. Therefore, it is excellent in terms of product displayability. Furthermore, the top plate 52 is held in place by its restoring force, with the left and right edges of the top plate 52 pressing against the inner surfaces of the left and right plates 60 and 70, making it difficult for the top plate 52 to tip over from an upright position. Furthermore, as shown in Figures 9 and 10, the joining piece 56 rises continuously from the rear side plate 54, which functions as a support and prevents the top plate 52 from tipping over backward. Furthermore, the top plate 52 is made of a single plate and is lighter than that of the first embodiment, making it easier to open and use as a signboard.

[0053] The packaging box 1A of this embodiment also has tear initiation portions 25, 25, which serve as tear initiation points, provided on the top plate 52. Front, left, and right tear guide lines L21, L22, and L22 for cutting open the top plate 52 are formed on the front, left, and right edges of the top plate 52. Therefore, the strength of the packaging box 1A can be ensured more reliably than when tear initiation portions and tear guide lines for opening the top plate are formed within the surfaces of the front side plate 53, rear side plate 54, left side plate 60, and right side plate 70. This makes it less likely for the strength of the packaging box 1A to decrease even when a large load or impact is applied during product transportation, etc.

[0054] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. For example, in each of the above embodiments, the fracture initiation portions 25, 25 are described as being formed at the left and right corners of the front of the top plates 20, 52, but this is not limited to this and they may be formed at other locations on the front edge of the top plates 20, 52.

[0055] Furthermore, in the first and second embodiments, the top plates 20, 52 are raised with the fracture initiation portions 25, 25, which are the starting points of fracture, facing downward, but the top plates 20, 52 may also be raised with the fracture initiation portions 25, 25 facing upward, in the opposite manner.

[0056] Although the packaging boxes 1, 1A in the first and second embodiments are made of corrugated cardboard, the packaging boxes may also be made of various known paperboards. [Explanation of symbols]

[0057] 1 packaging box 1A packaging box 11 Front plate (side plate) 12 Rear plate (side plate) 13 Left side plate (side plate) 14 Right side plate (side plate) 20 Top plate 21 Upper outer flap 22 Upper inner flap 25 Break initiation 30 Bottom plate 51 Bottom plate 52 Top plate 53 Front plate (side plate) 54 Rear plate (side plate) 56 Joint piece 57 Top plate bend guide line 60 Left side plate (side plate) 70 Right side plate (side plate) 80 Top opening L21 Front break guide wire L22 Left break induction wire, right break induction wire L24 Rear break guide wire

Claims

1. The front, back, left and right side panels, a top plate connected to the upper edges of the front, rear, left, and right side plates; A packaging box comprising: a bottom plate connected to the lower edge portions of the front, rear, left, and right side plates; a front break guide line formed on the front edge of the top plate; a left breakage guide line formed on the left edge of the top plate; a right break guide line formed on the right edge of the top plate; a rear break guide line formed on the rear edge of the top plate; A break initiation portion formed on the top plate and serving as a break initiation portion of the front break guide wire; It is equipped with The top plate is front and rear upper outer flaps connected to upper edge portions of the front and rear side plates; left and right upper inner flaps connected to upper edge portions of the left and right side plates and overlapping the lower surfaces of the front and rear upper outer flaps; The fracture initiation portion is The front upper outer flap is formed with folding guide lines at the left and right corners of the front part, The folding guide line of the left tear start portion extends obliquely from the left edge of the front upper outer flap to the front edge thereof, and its front end is connected to the front tear guide line; The folding guide line of the right-side tear start portion extends obliquely from the right edge of the front upper outer flap to the front edge, and its front end is connected to the front tear guide line, The left and right upper inner flaps are formed with fold guide lines for the left and right upper inner flaps, which form part of the tear initiation portion, at positions corresponding to the fold guide lines of the front upper outer flap, The folding guide line of the upper outer flap and the folding guide lines of the left and right upper inner flaps are overlapped in the vertical direction, The top plate can be separated from the front, rear, left, and right side plates by breaking the front break induction line, the left break induction line, the right break induction line, and the rear break induction line starting from the break initiation portion, The separated top plate is A packaging box characterized in that the upper edge of the rear side panel is inserted between one of the front and rear upper outer flaps and the left and right upper inner flaps, thereby connecting to the upper edge of the rear side panel and forming a signboard on the upper side of the rear side panel.

2. The front, back, left and right side panels, a top plate connected to the upper edges of the front, rear, left, and right side plates; A packaging box comprising: a bottom plate connected to the lower edge portions of the front, rear, left, and right side plates; a front break guide line formed on the front edge of the top plate; a left breakage guide line formed on the left edge of the top plate; a right break guide line formed on the right edge of the top plate; A break initiation portion formed on the top plate and serving as a break initiation portion of the front break guide wire; a top plate bending guide line provided in the plane of the top plate parallel to the left and right edges of the top plate for bending the top plate left and right; It is equipped with a rear edge portion of the top plate is bonded to a strip-shaped joining piece connected to an upper edge portion of the rear side plate, and is connected to the rear side plate; The top plate is The front break guide wire, the left break guide wire, and the right break guide wire are broken starting from the break initiation portion, and the rear edge portion of the top plate is peeled off from the joining piece, thereby separating the top plate from the front, rear, left, and right side plates, The separated top plate is The packaging box is characterized in that, in a state where the top plate is bent along the folding guide line as a folding line, it is inserted into the inside of the rear side plate through the upper openings of the front, rear, left, and right side plates, forming a signboard on the upper side of the rear side plate.

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