Packing box

Abstract

To provide a packing box which can make effective use of display space and suppress decrease in strength of the bottom plate before opening.SOLUTION: A packaging box 1 includes a body part 10, a top plate 20 and a bottom plate 30. The body part 10 has front and rear end walls 11, 12 and left and right side walls 13, 14. On the top plate 20 is formed a first cutting guide line L10 extending in the left-right direction, and on the center part of the front-rear direction of the bottom plate 30 is formed a ruled line L40 extending in the left-right direction. On both side walls 13, 14 a second cutting guide line L20 extending downward from the first cutting guide line L10 is formed, and the lower end of the second cutting guide line L20 is connected to the end part of the ruled line L40.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] Some corrugated cardboard packaging boxes have perforated cutting guide lines formed in the center of the top plate, both side walls, and bottom plate in the front-to-rear direction (see, for example, Patent Document 1). When such a packaging box is cut open along the cutting guide lines, the packaging box is separated in the center to form two trays. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3197488 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional packaging box, since the two separate trays are arranged side by side, it is necessary to secure a large lateral width for display space.

[0005] An object of the present invention is to provide a packaging box that solves the above-mentioned problems and makes effective use of display space. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a packaging box comprising a cylindrical body, a top plate and a bottom plate provided at upper and lower openings of the body, the body having front and rear end walls and left and right side walls. A first cutting guide line extending in the left-right direction is formed on the top plate, and a crease extending in the left-right direction is formed in the center of the bottom plate in the front-rear direction. Second cutting guide lines extending downward from the first cutting guide line are formed on both side walls, and lower ends of the second cutting guide lines are connected to ends of the creases. The rear end wall is formed with a bottom raised portion that can be bent inwardly of the body portion.

[0007] When opening the packaging box of the present invention, the first cutting guide line on the top plate and the second cutting guide lines on both side walls are cut open, and then the bottom plate is folded back and forth along the creases to form a mountain fold, thereby forming a front tray with the front end wall as the bottom plate and a rear tray with the rear end wall as the bottom plate, which are connected front to back. In the packaging box of the present invention, the two trays can be connected and lined up in the depth direction of the display shelf, making it possible to effectively utilize the display space.

[0008] In the packaging box, the rear end wall has a bottom raising portion that can be bent toward the inside of the body portion. is formed. When the packaging box is opened, the contents of the rear tray, which uses the rear end wall as a bottom plate, can be pushed up by the bottom raising part. This allows the front and rear contents to be arranged in a stepped manner so that the tops of the contents of the rear tray protrude higher than the contents of the front tray, thereby effectively highlighting the entire contents lined up in front and behind.

[0009] In a first configuration of the present invention, a second cutting guide line is formed on each of the side walls, the second cutting guide line extending downward from the first cutting guide line. The second cutting guide line has an inclined portion extending obliquely downward from the first cutting guide line toward the rear. At the same time, a lower end of the second cutting guide line is connected to an end of the crease. The side wall is configured to be separated into front and rear parts by cutting open the second cutting guide line. In this configuration, after the first cutting guide wire is cut open, by lifting the rear part of the top plate, the second cutting guide wire can be smoothly cut open obliquely downward.

[0010] By providing an inclined portion to the second cutting guide line, when two trays are arranged one behind the other, the upper edges of the side walls of the front and rear trays become higher toward the rear. This makes it easier to expose the contents of the front tray and remove them. Also, in the rear tray, even if the contents are pushed up, they can be held down by the side walls.

[0011] As a second configuration of the present invention, A second cutting guide line is formed on each of the two side walls, the second cutting guide line extending downward from the first cutting guide line. The lower end of the second cutting guide line is connected to the end of the crease. The side walls are configured to be separated into front and rear parts by cutting open the second cutting guide line. In addition, The top plate includes an end flap connected to the front end wall and a side flap connected to the side wall, and the side flap is overlapped on the upper surface of the end flap. In this case, a protruding portion protruding rearward is formed at the rear edge of the end flap. Also, the side flap is formed with an opening start portion connected to the first cutting guide line, and the opening start portion is overlapped on the upper surface of the protruding portion.

[0012] In this configuration, when the opening start portion is cut from the top plate and the two trays are arranged one behind the other, the protruding portion protrudes above the upper edge of the front wall of the front tray. This allows the protruding portion to hold the contents in place and also allows product information, etc. to be displayed on the front of the protruding portion.

[0013] In the packaging box described above, an insertion piece is formed in the bottom plate at a position either forward or backward from the crease, and a locking hole is formed in the other position either forward or backward from the crease. When the bottom plate is folded over at the crease, it is preferable that the insertion piece be inserted into the locking hole to be locked. In this configuration, when the bottom plate of the packaging box is folded over, the insertion piece is engaged with the engagement hole, so that the bottom plate can be maintained in the folded state even if a restoring force is generated in the bottom plate. Effect of the Invention

[0014] When the packaging box of the present invention is opened, the two trays are connected from the front to the back, so that the display space can be effectively utilized for display. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper left front side. [Diagram 2] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the lower right rear side. [Diagram 3] FIG. 2 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention. [Figure 4] 4A to 4C are side views illustrating a step of opening the packaging box according to the embodiment of the present invention. [Diagram 5] 1 is a perspective view showing front and rear trays in a packaging box according to an embodiment of the present invention; [Figure 6] 2 is a perspective view showing a step of putting contents into a packaging box according to an embodiment of the present invention; FIG. [Figure 7] 1 is a side cross-sectional view showing a state in which contents are accommodated in front and rear trays of a packaging box according to an embodiment of the present invention. FIG. [Figure 8] 1 is a perspective view showing a state in which contents are accommodated in front and rear trays of a packaging box according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 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, rear, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration of the packaging box of the present invention.

[0017] 1, the packaging box 1 of this embodiment includes a cylindrical body 10, a top plate 20 connected to the upper edge of the body 10, and a bottom plate 30 connected to the lower edge of the body 10. The packaging box 1 of this embodiment is an A-type cardboard box.

[0018] The packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S cut out from a cardboard sheet along each crease, as shown in Fig. 3. The blank sheet S shown in Fig. 3 is arranged so that the outer surface is visible. Each crease (fold line) of the blank sheet S is a linear groove (crease) formed by pressing into the surface of the blank sheet S. Note that notches may be formed in the creases. In this way, it becomes easier to fold the blank sheet S at the creases.

[0019] 1, the body 10 has front and rear end walls 11, 12 and left and right side walls 13, 14. Each of the end walls 11, 12 and both side walls 13, 14 is a rectangular wall portion. The left side wall 13 is connected to the left edge of the front end wall 11 via a crease. The right side wall 14 is connected to the right edge of the front end wall 11 via a crease. The rear end wall 12 is connected to the rear edge of the right side wall 14 via a crease. A band-shaped joint piece 15 is connected to the rear edge of the left side wall 13 via a crease.

[0020] When the blank sheet S (see Figure 3) is folded along each of the lines and the joining piece 15 is joined to the inner surface of the rear end wall 12 by an adhesive means such as hot melt, a rectangular tubular body 10 is formed by the front and rear end walls 11, 12 and the left and right side walls 13, 14.

[0021] The top plate 20 closes the upper opening of the body 10. The top plate 20 is provided with front and rear end flaps 21, 22 connected to the upper edges of the front and rear end walls 11, 12, respectively, and left and right side flaps 23, 24 connected to the upper edges of the left and right side walls 13, 14, respectively.

[0022] The front end flap 21 is formed with a band-shaped flat portion 21a formed along the upper edge of the front end wall 11, and a protrusion 21b protruding rearward from the center of the rear edge of the flat portion 21a (see Figure 3). The rear end flap 22 is a rectangular flat plate connected to the upper edge portion of the rear end wall 12. The front and rear end flaps 21, 22 are arranged with an interval between them in the front-rear direction.

[0023] The left side flap 23 is a rectangular flat plate and covers the left half of the upper opening of the body 10. The right side flap 24 is a rectangular flat plate and covers the right half of the upper opening of the body 10. The left and right side flaps 23, 24 are overlapped on the upper surfaces of the front and rear end flaps 21, 22, and the leading edges of the left and right side flaps 23, 24 are butted together. The leading edges of the both side flaps 23, 24 are joined to each other by adhesive tape (not shown).

[0024] A fold-in portion 25 is formed at the rear end of the top plate 20. The fold-in portion 25 is a strip-shaped portion extending forward from the center of the rear edge of the top plate 20. The left and right edges of the fold-in portion 25 are defined by cutting guide lines formed on the left and right side flaps 23, 24. The left-right width of the folding portion 25 is set so that when the leading edges of the side flaps 23, 24 are joined together with adhesive tape (not shown), the adhesive tape is attached between the left and right edges of the folding portion 25 (left and right cutting guide lines).

[0025] 2, the bottom plate 30 closes the lower opening of the body 10. The bottom plate 30 includes front and rear end flaps 31, 32 connected to the lower edges of the front and rear end walls 11, 12, respectively, and left and right side flaps 33, 34 connected to the lower edges of the left and right side walls 13, 14, respectively. The left and right side flaps 33, 34 are overlapped on the undersides of the front and rear end flaps 31, 32, and the leading edges of the left and right side flaps 33, 34 are joined together with an adhesive tape (not shown). In addition, a fold-in portion 35 is formed at the rear end of the bottom plate 30, similar to the fold-in portion 25 of the top plate 20 (see FIG. 1).

[0026] 1, an opening start portion 40 extending in the left-right direction is formed on the top plate 20. The opening start portion 40 is a strip-shaped region surrounded by the straight portion L11 and the bent portion L12 of the first cutting guide line L10. In other words, the opening start portion 40 is a region connected to the first cutting guide line L10. The opening start portion 40 extends linearly in parallel with the front edge of the top plate 20 and is formed across the left and right edges of the top plate 20 . The left end of the opening start portion 40 fits into the upper end of the left side wall 13. Also, the right end of the opening start portion 40 fits into the upper end of the right side wall 14, as shown in FIG.

[0027] The opening start portion 40 is disposed forward of the center portion in the front-rear direction of the top plate 20. The opening start portion 40 is superimposed on the upper surface of the protruding portion 21b of the front end flap 21. The front edge portion of the opening start portion 40 is disposed at a position superimposed on the rear edge portion of the flat portion 21a of the front end flap 21.

[0028] As shown in Figures 1 and 2, the first cutting guide line L10 is a perforated line with intermittent slits, and is composed of two straight lines L11 formed on the top plate 20 and two bent lines L12, L12 formed on the left and right side walls 13, 14. The first cutting guide line L10 surrounds the opening start portion 40 with both straight lines L11, L11 and both bent lines L12, L12 (see Figure 3). The interval and shape of the slits of the first cutting guide line L10 are not limited. The straight line portion L11 extends in the left-right direction parallel to the front edge of the top plate 20, and is formed across the left and right edges of the top plate 20. The top plate 20 has front and rear straight line portions L11, L11 arranged at an interval in the front-rear direction.

[0029] 1, the left bent portion L12 is formed at the upper end portion of the left side wall 13. The bent portion L12 is bent into a U-shape, and both ends of the bent portion L12 are connected to the left ends of the front and rear straight portions L11, L11, respectively. As shown in FIG. 2, the upper end of the right side wall 14 is formed with a right bent portion L12 similar to the left bent portion L12 (see FIG. 1).

[0030] As shown in FIG. 1, a second cutting guide line L20 is formed on the left side wall 13, extending downward from the first cutting guide line L10. The second cutting guide line L20 is a perforated line in which slits are formed intermittently. Note that the intervals and shapes of the slits of the second cutting guide line L20 are not limited. The second cutting guide wire L20 is formed with an inclined portion L21 extending obliquely downward from the first cutting guide wire L10 toward the rear, and a vertical portion L22 extending downward from the lower end of the inclined portion L21.

[0031] The inclined portion L21 extends obliquely downward toward the rear from the front corner of the bent portion L12 of the first cutting guide wire L10. The lower end of the inclined portion L21 is disposed in the center of the left side wall 13 in the front-to-rear direction and is disposed slightly below the center of the left side wall 13 in the up-down direction.

[0032] The vertical portion L22 extends downward from the lower end of the inclined portion L21. The vertical portion L22 also extends perpendicular to the lower edge of the left side wall 13. The lower end of the vertical portion L22 is connected to the center of the lower edge of the left side wall 13.

[0033] A side crease L30 is formed on the left side wall 13, extending obliquely upward and rearward from the lower end of the inclined portion L21 of the second cutting guide line L20. The side crease L30 extends to the vicinity of the upper edge of the left side wall 13. Although the side line L30 is formed on the inner surface of the left side wall 13, in order to make the arrangement of the side line L30 easier to understand, in each figure it is shown by a solid line on the outer surface of the left side wall 13.

[0034] As shown in FIG. 2, the right side wall 14 is formed with a bent portion L12 of the first cutting guide line L10, a second cutting guide line L20, and a side line L30, similar to the left side wall 13 (see FIG. 1).

[0035] The bottom plate 30 has a crease L40 extending in the left-right direction. The crease L40 is formed in a straight line from the center of the left edge to the center of the right edge of the bottom plate 30. The crease L40 is a folding line for folding the bottom plate 30 in half at the center between the front and rear, and is formed on the outer surfaces of the left and right side flaps 33, 34 of the bottom plate 30. When a notch is formed in part of the crease L40, the bottom plate 30 can be easily folded at the crease L40.

[0036] The left end of the crease L40 is connected to the lower end of the second cutting guide line L20 (see FIG. 3) formed on the left side wall 13. The right end of the crease L40 is connected to the lower end of the second cutting guide line L20 formed on the right side wall 14.

[0037] Left and right third cutting guide lines L50, L50 extending in the up-down direction are formed in the center of the rear end wall 12 in the left-right direction. The third cutting guide line L50 is a perforated line with intermittent slits. The interval and shape of the slits of the third cutting guide line L50 are not limited. The left and right third cutting guide lines L50, L50 are arranged at an interval in the left-right direction. A bottom-raised portion 50 is formed between the left and right third cutting guide lines L50, L50.

[0038] The raised bottom portion 50 is a portion that can be bent inwardly of the body portion 10 (see FIG. 7). The raised bottom portion 50 is formed in a strip shape from the upper edge to the lower edge of the rear end wall 12. The left and right edges of the raised bottom portion 50 (left and right third cutting guide lines L50, L50) are curved in an arc shape so that the width of the central portion in the up-down direction is the widest.

[0039] Left and right folded-back portions 51, 51 are formed in the vertical center of the bottom-raised portion 50, and a line L51 extending in the left-right direction is also formed. 3, the upper end of the bottom-raised portion 50 is inserted into the front end of the front end flap 21 of the top plate 20. In other words, the upper ends of the left and right third cutting guide lines L50, L50 extend to the front end of the front end flap 21. A ruled line L52 is formed between the upper ends of the left and right third cutting guide lines L50, L50. The lower end of the bottom-raised portion 50 is inserted into the front end of the end flap 31 on the front side of the bottom plate 30. In other words, the lower ends of the left and right third cutting guide lines L50, L50 extend to the front end of the end flap 31. A ruled line L52 is formed between the lower ends of the left and right third cutting guide lines L50, L50.

[0040] As shown in FIG. 2, the bottom plate 30 has left and right insertion pieces 61, 61 formed in a portion forward of the pressed line L40, and left and right locking holes 62, 62 formed in a portion rearward of the pressed line L40.

[0041] The insertion piece 61 has slits formed on the left and right edges and the front edge, and has lines formed on the rear edge. The width of the insertion piece 61 in the left-right direction is wider at the front end than at the rear end. The locking hole 62 is formed at a position that overlaps the insertion piece 61 when the bottom plate 30 is folded over at the crease L40. The left-right width of the locking hole 62 is narrower than the maximum left-right width of the insertion piece 61. As shown in Fig. 5, when the bottom plate 30 is folded over and the insertion piece 61 and the locking hole 62 are overlapped, the insertion piece 61 can be inserted into the locking hole 62 and locked. In the state of the blank sheet S (see FIG. 3), the locking holes 62 are covered by the lid. The lid has slits formed on the left and right edges and the rear edge, and has a crease formed on the front edge.

[0042] Next, a procedure for opening the packaging box 1 of this embodiment will be described. When opening the packaging box 1 shown in Fig. 1, first, the first cutting guide line L10 is cut open, and the opening start portion 40 is cut off. This forms a band-shaped opening at the upper end portions of the top plate 20 and the left and right side walls 13, 14. The top plate 20 is separated into a front portion 20a and a rear portion 20b with the opening in between. In addition, the protruding portion 21b of the front end flap 21 is exposed in the opening.

[0043] Next, as shown in Fig. 4, the worker puts his hands on the edge of the opening of the top plate 20 and pulls up the rear part 20b of the top plate 20. In this way, as shown in Fig. 5, the second cutting guide lines L20, L20 of the left and right side walls 13, 14 are cut open, and the both side walls 13, 14 are separated into the front and rear. At this time, the second cutting guide line L20 is smoothly cut open diagonally downward from the first cutting guide line L10 at the inclined portion L21 (see Figure 4), and both side walls 13, 14 are bent so as to bulge outward at the side line L30, so that the second cutting guide line L20 can be cut open easily and neatly.

[0044] After cutting open the left and right second cutting guide lines L20, L20, as shown in FIG. 4, when the front and rear parts of the packaging box 1 are tilted around the crease L40 of the bottom plate 30 as a rotation axis, the bottom plate 30 is bent in a mountain fold at the crease L40. Then, as shown in FIG. 7, when the front and rear halves of the bottom plate 30 are folded back and forth, the front tray 2A and the rear tray 2B are formed in a state where they are connected back and forth.

[0045] 5, the front tray 2A has the front end wall 11 as a bottom plate. The front tray 2A has the front part 20a of the top plate 20 as a front wall and the front half of the bottom plate 30 as a rear wall. The left and right side walls 13, 14 of the front tray 2A are higher at their rear portions than at their front portions. The middle portions of the upper edges of the left and right side walls 13, 14 of the front tray 2A are inclined so as to become higher from the front to the rear. In the front tray 2A, the protruding portion 21b of the end flap 21 protrudes above the upper edge of the front wall.

[0046] The rear tray 2B has the rear end wall 12 as its bottom plate. The rear half of the bottom plate 30 serves as its front wall, and the rear portion 20b of the top plate 20 serves as its rear wall. The front wall of the rear tray 2B is at the same height as the rear wall of the front tray 2A. The left and right side walls 13, 14 of the rear tray 2B are higher at the rear than at the front. The middle parts of the upper edges of the left and right side walls 13, 14 of the rear tray 2B are inclined so as to become higher from the front to the rear. The upper edges of the left and right side walls 13, 14 of the rear tray 2B are higher than the upper edges of the left and right side walls 13, 14 of the front tray 2A.

[0047] When the bottom plate 30 is folded over, an insertion piece 61 formed in the front half of the bottom plate 30 and an engagement hole 62 formed in the rear half of the bottom plate 30 overlap each other from front to rear. By inserting the insertion piece 61 into the engagement hole 62 and engaging it, the bottom plate 30 can be maintained in the folded over state even if a restoring force is generated in the bottom plate 30.

[0048] Next, the manner in which the contents P are contained in the packaging box 1 of this embodiment will be described. In this embodiment, as shown in Fig. 6, a case will be described in which contents P, which are bags of food, are contained in a packaging box 1. In this embodiment, a plurality of contents P are contained in the packaging box 1.

[0049] In the following description, the top and bottom of the content P refer to the top and bottom when the content P is placed upright so that the letters and numbers written on the content P are correctly arranged (see FIG. 8). The front surface P1 of the contents P is the surface on which the product name is printed in large letters and is the surface shown on the front side when the contents P is displayed in a store. The back surface P2 of the contents P is the surface on which product information such as the product's ingredients and price is printed.

[0050] In this embodiment, four stacks of four contents P are arranged front to back, left to right and placed in the packaging box 1. At this time, the contents P placed in the front half of the packaging box 1 have their front surface P1 on the top, their bottoms on the front side, and their tops on the rear side. The contents P placed in the rear half of the packaging box 1 have their back surface P2 on the top, their tops on the front side, and their bottoms on the rear side.

[0051] As shown in Fig. 4, when the first cutting guide line L10 and the second cutting guide line L20 are cut open and the bottom plate 30 is folded over to arrange the two trays 2A and 2B in front and behind, the tops of all the contents P are arranged on the upper side and the bottoms are arranged on the lower side as shown in Fig. 8. In addition, the surfaces P1 of all the contents P are arranged on the front side.

[0052] As shown in Fig. 7, the left and right third cutting guide lines L50, L50 (see Fig. 2) formed on the rear end wall 12 of the rear tray 2B are cut open, and the raised bottom portion 50 is folded inwardly of the body portion 10. At this time, the ends of the raised bottom portion 50 formed on the rear end flaps 22, 32 are also folded. The folded portion 25 formed on the top plate 20 and the folded portion 35 formed on the bottom plate 30 are also folded inwardly of the body portion 10. Furthermore, by folding the left and right fold-back portions 51, 51 (see Fig. 2) of the raised bottom portion 50 downwardly, the raised bottom portion 50 becomes less likely to return to its original position.

[0053] In this manner, by pushing up the bottom raising portion 50 from the bottom plate (end wall 12) of the rear tray 2B, each of the contents P of the rear tray 2B is pushed up by the bottom raising portion 50. As a result, as shown in Fig. 8, the upper portions of each of the contents P of the rear tray 2B can be made to protrude higher than each of the contents P of the front tray 2A.

[0054] The upper edges of the side walls 13, 14 of the front and rear trays 2A, 2B become higher toward the rear (see FIG. 5). This allows the contents P to be largely exposed in the front tray 2A, making them easier to remove. Also, in the rear tray 2B, even if the contents P are pushed up, they can be held down by the left and right side walls 13, 14.

[0055] In addition, in the front tray 2A, the protrusion 21b protrudes from the upper edge of the front wall, and the protrusion 21b can hold down the contents P. In addition, product information and the like can be displayed on the front surface of the protrusion 21b.

[0056] In the above-described packaging box 1, the front tray 2A and the rear tray 2B are connected from front to rear when the box is opened, as shown in Fig. 8, so that the front and rear trays 2A and 2B can be arranged in the depth direction of the display shelf in a connected state. In this way, the packaging box 1 of this embodiment can effectively utilize the display space to display the contents P in the store.

[0057] In the packaging box 1 of this embodiment, as shown in Fig. 2, a folding crease L40 is formed on the bottom plate 30. In this configuration, it is possible to suppress a decrease in strength of the bottom plate 30 before opening, compared to a configuration in which perforated cutting guide lines are formed all over the left and right edges of the bottom plate 30.

[0058] In the packaging box 1 of this embodiment, the contents P of the rear tray 2B can be pushed up by the bottom raising portion 50 (see FIG. 7) so that the contents P of the front and rear trays 2A and 2B can be arranged in a stepped manner. This allows the packaging box 1 of this embodiment to effectively appeal not only to the contents P of the front (near side) tray 2A, but also to the contents P of the rear (deep side) tray 2B.

[0059] The front and rear trays 2A and 2B can be separated by cutting the bottom plate 30 at the crease L40. For example, when the contents P in the front tray 2A run out, removing the front tray 2A makes it easier to take out the contents P in the rear tray 2B.

[0060] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. In the packaging box 1 of this embodiment, as shown in Figures 1 and 2, an inclined portion L21 is formed in the second cutting guide line L20, but the entire second cutting guide line L20 may be extended in a straight line perpendicular to the lower edge portions of the side walls 13 and 14.

[0061] 1, the packaging box 1 of this embodiment is formed with a strip-shaped opening start portion 40, but the shape of the opening start portion 40 is not limited. Furthermore, the top plate 20 may not be provided with the opening start portion 40, and only one first cutting guide line L10 may be formed on the top plate 20.

[0062] In the packaging box 1 of this embodiment, as shown in Fig. 8, a rectangular protruding portion 21b protrudes above the front wall of the front tray 2A, but the shape of the protruding portion 21b is not limited. Also, the protruding portion 21b does not have to be provided on the end flap 21 on the front side of the packaging box 1.

[0063] In the packaging box 1 of this embodiment, as shown in Figures 1 and 2, the top plate 20 and the bottom plate 30 are configured with a plurality of flaps, but the configuration of the top plate 20 and the bottom plate 30 is not limited. For example, the upper and lower openings of the body 10 may be closed by a single top plate or bottom plate.

[0064] The packaging box 1 of this embodiment is made of corrugated cardboard, but the packaging box may also be made of various known paperboards. [Explanation of symbols]

[0065] 1 packaging box 2A Front tray 2B Rear tray 10. Torso 11 Front end wall 12 Rear end wall 13 Left side wall 14 Right side wall 20 Top plate 21 Front end flap 21b Projection 22 Rear end flap 23 Left side flap 24 Right side flap 25 Folding section 30 Bottom plate 31 Front end flap 32 Rear end flap 33 Left side flap 34 Right side flap 35 Folding section 40 Opening start part 50 Bottom Raised Section 51 Folded part 61 Insert 62 Locking hole L10 First cutting guide wire L11 Straight section L12 bent part L20 Second cutting guide wire L21 Inclined section L22 Vertical section L30 Side crease L40 Pressed ruled line L50 Third cutting guide wire P Contents P1 surface P2 Back S Blank Sheet

Claims

1. A cylindrical body portion; A top plate and a bottom plate are provided at the upper and lower openings of the body, The body portion has front and rear end walls and left and right side walls, The top plate is formed with a first cutting guide line extending in the left-right direction, A crease extending in the left-right direction is formed in the center of the bottom plate in the front-rear direction, A second cutting guide line is formed on each of the side walls and extends downward from the first cutting guide line, The second cutting guide wire has an inclined portion extending obliquely downward from the first cutting guide wire toward the rear, The lower end of the second cutting guide line is connected to the end of the crease, The side wall is configured to be separated into front and rear parts by cutting the second cutting guide line, A packaging box, characterized in that a bottom raised portion that can be bent inwardly of the body portion is formed on the rear end wall.

2. A cylindrical body portion; A top plate and a bottom plate are provided at the upper and lower openings of the body, The body portion has front and rear end walls and left and right side walls, The top plate is formed with a first cutting guide line extending in the left-right direction, A crease extending in the left-right direction is formed in the center of the bottom plate in the front-rear direction, A second cutting guide line is formed on each of the side walls and extends downward from the first cutting guide line. The lower end of the second cutting guide line is connected to the end of the crease, The rear end wall is formed with a bottom-raised portion that can be bent toward the inside of the body portion, The top plate is an end flap connected to the front end wall; a side flap connected to the side wall; The side flaps are superimposed on top of the end flaps; A protrusion protruding rearward is formed on the rear edge of the end flap, The side flap is formed with an opening start portion connected to the first cutting guide line, A packaging box, characterized in that the opening start portion is overlapped on an upper surface of the protruding portion.

3. The packaging box according to claim 1 or 2, The bottom plate has: An insertion piece is formed at a position on either side of the crease, A locking hole is formed in a portion other than the front and rear of the crease, A packaging box characterized in that, with the bottom plate folded over at the crease, the insertion piece can be inserted into the locking hole to be locked.

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