Packing box

Abstract

To provide a packing box that is easy to advance breaking along a break guide line and enables good opening workability.SOLUTION: A packing box 1 includes: a bottom plate 11; a pair of right and left side plates 13 and 14 that continue to the right and left edges of the bottom plate 11; a top plate 12 that continues to the upper edge part of the side plate 14; and a pair of front and back end plates 20 and 30. Both of the end plates 20 and 30 include: an opening part 50 that is opened by a break starting part 5 that becomes the original point when opening; and break support rule marks L40 and L40 that are formed to be axially symmetry to each other with respect to a base line X1 that runs vertically on the break starting part 5. The break support rule marks L40 and L40 are formed over the end plate 20 on the front side, the top plate 12, and the end plate 30 on the rear side.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art Conventionally, packaging boxes are known that are used as shipping boxes when transporting products and also when displaying products in stores (see, for example, Patent Document 1). The packaging box of Patent Document 1 is made of cardboard, and by simply separating a portion of the top plate and end plate from the sealed state and opening a portion of the packaging box, products can be displayed as is. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-157611 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional packaging boxes described above, the opening opening is opened by breaking a break guide line such as a perforation, but there was a problem that the opening workability was poor, such as the break progression deviating from the break guide line when opening.

[0005] An object of the present invention is to solve the above-mentioned problems and to provide a packaging box which is easy to break along the break guide line and has good opening properties. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a seat cover comprising a bottom plate, a pair of left and right side plates connected to the left and right edges of the bottom plate, a top plate connected to the upper edge of one of the side plates, and a pair of front and rear end plates; A break guide wire formed so as to be releasable across the front end plate, the top plate, and the rear end plate;The packaging box has a tear-opening portion that is opened by a tear-starting portion that serves as a starting point when opening the box, and a tear-support crease that is formed symmetrically with respect to a reference line that passes through the tear-starting portion in the up-down direction. The tear-support crease extends from the front end plate, the top plate, and the rear end plate. In succession has been formed.

[0007] In the packaging box of the present invention, when the opening portion is pulled up with the fingers starting from the tear initiation portion, the end plate bends at the tear support crease, and the tear progresses along the tear guide line. This allows the opening portion to be cut open smoothly. Also, when the tear progresses from the end plate to the top plate, the top plate bends at the tear support crease, and the tear progresses smoothly from the end plate to the top plate. This allows the end plate and the top plate to be cut open smoothly. Therefore, the opening operation is easy to perform.

[0008] In addition, the breakage initiation portion has The above It is preferable that a break induction wire is connected.

[0009] In this configuration, the break progresses along the break guide line, so the opening portion can be smoothly cut open.

[0010] It is also preferable that the top plate has a folding line formed thereon that is perpendicular to the upper edge of the side plate.

[0011] With this configuration, when the top plate is opened up to the folding line, the top plate can be used as a lid.

[0012] The fracture support crease preferably has a parabolic shape. By configuring in this manner, the strength of the packaging box can be improved compared to when the breaking support creases are formed in straight lines. Effect of the Invention

[0013] The packaging box of the present invention is easy to break along the break guide lines and has good opening operability. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing a packaging box according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a blank sheet for a packaging box according to the first embodiment of the present invention. [Figure 3A] FIG. 1 is a front view showing a packaging box according to a first embodiment of the present invention. [Figure 3B] FIG. 2 is a rear view showing the packaging box according to the first embodiment of the present invention. [Figure 3C] FIG. 1 is a left side view showing a packaging box according to a first embodiment of the present invention. [Figure 4] 1 is a perspective view showing a state when the packaging box according to the first embodiment of the present invention is opened. FIG. [Diagram 5] 1 is a perspective view showing a state in which a lower flap is opened when opening a packaging box according to a first embodiment of the present invention. FIG. [Figure 6] FIG. 2 is a perspective view showing a state in which the side flaps of the packaging box according to the first embodiment of the present invention have been opened. [Figure 7] 1 is a perspective view showing a state in which a top plate and a rear end plate of the packaging box according to the first embodiment of the present invention have been partially opened. FIG. [Figure 8] 1 is a perspective view showing a state in which a top plate and a part of a rear end plate of a packaging box according to a first embodiment of the present invention have been opened from the rear side. FIG. [Figure 9] FIG. 11 is a diagram showing a blank sheet for a packaging box according to a second embodiment of the present invention. [Figure 10] FIG. 11 is a perspective view showing a state when a packaging box according to a second embodiment of the present invention is opened. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 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 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 description will be omitted.

[0016] (First embodiment) As shown in Figures 1 and 2, the packaging box 1 of this embodiment is a wrap-around type box, and is a rectangular parallelepiped whose length in the front-to-rear direction is greater than that in the left-to-right direction. The packaging box 1 includes a bottom plate 11, a pair of front and rear end plates 20, 30, a pair of left and right side plates 13, 14, and a top plate 12. As described later, the packaging box 1 is formed with an opening portion 50 (see Figure 4) that serves as an opening for removing the contents, extending from the front end plate 20 to the front side of the top plate 12. The packaging box 1 can be opened in various ways, such as an opening form in which the entire front end plate 20 is opened, or an opening form in which the entire top plate 12 is opened.

[0017] The packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S1 cut out from a single sheet of cardboard at each crease, 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, each crease formed on the inner surface is shown by a solid line. Each crease (fold line) of the blank sheet S1 is a linear groove (crease) formed by pressing the surface of the blank sheet S1. Note that notches (half-cut lines, etc.) may be formed in the crease. This makes it easier to fold the blank sheet S1 at the crease.

[0018] The bottom plate 11 is a rectangular flat plate as shown in Fig. 1. A left side plate 13 is connected to the left edge of the bottom plate 11 via a line, and a right side plate 14 is connected to the right edge of the bottom plate 11 via a line. The left side plate 13 and the right side plate 14 are the same rectangular flat plate and are formed perpendicular to the bottom plate 11.

[0019] The top plate 12 is connected to the upper edge of the right side plate 14 via a crease. The top plate 12 is a flat rectangular plate like the bottom plate 11, and is formed perpendicular to the right side plate 14. A joint piece 16 is connected via a crease to the left edge of the top plate 12. The joint piece 16 is a strip-shaped plate formed along the left edge of the top plate 12.

[0020] Upper break guiding lines L12, L12 are formed along the lines on the left and right edges of the top plate 12. The upper break guiding lines L12, L12 are for separating the top plate 12 from the left side plate 13 and the right side plate 14 when the top plate 12 is opened. The upper break guiding lines L12, L12 are perforated lines with intermittent slits. The intervals and shapes of the slits are not limited. The upper break induction wires L12, L12 of this embodiment are formed so as to be connected to left break induction wires L13, L16 and right break induction wire L14 of the left side plate 13 and the right side plate 14, which will be described later.

[0021] A fold line L45 that functions as a fold line is formed on the front side of the top plate 12. The fold line L45 is a linear groove (pressed crease) formed by pressing the inner surface. The fold line L45 extends linearly so as to connect the front ends of the upper break guiding lines L12, L12 (the connection parts with the left break guiding line L13 and the right break guiding line L14) and is parallel to the front edge of the top plate 12.

[0022] A top plate opening portion 54 (see FIG. 4) is formed on the top plate 12 by an area defined by the fold line L45 and the left edge, right edge, and front edge of the top plate 12. The top plate opening portion 54 constitutes a part of an opening portion 50 provided in the packaging box 1. The opening portion 50 (top plate 12) can be opened using the fold line L45 as a pivot axis, and the opening can be used as an openable and closable lid.

[0023] The top plate 12 has top plate front support creases L42, L42 constituting part of a pair of left and right breaking support creases L40, L40 described below, and top plate rear support creases L43, L43 continuing thereto. The top plate front support creases L42, L42 and the top plate rear support creases L43, L43 extend in a curved linear shape in the front-to-rear direction of the top plate 12. The top plate front support creases L42, L42 are creases continuing from the front support creases L41, L41 of the front end plate 20 described below, from the front edge of the top plate 12 to the folding crease L45 of the top plate 12. The top plate rear support creases L43, L43 are creases continuing from the top plate front support creases L42, L42, from the folding crease L45 to the rear edge of the top plate 12. Details of the break support lines L40, L40 will be described later.

[0024] The blank sheet S1 (see Figure 2) is folded along each of the lines, and a joining piece 16 connected to the left edge of the top plate 12 is joined to the outer surface of the upper part of the left side plate 13, so that the left side plate 13, bottom plate 11, right side plate 14 and top plate 12 are formed into a rectangular tube shape.

[0025] The front end plate 20 has a pair of upper and lower outer flaps 21, 22 connected to the front edges of the bottom plate 11 and the top plate 12, respectively, and a pair of left and right inner flaps 23, 24 connected to the front edges of the left side plate 13 and the right side plate 14, respectively. The outer flaps 21, 22 are superimposed on the outer surfaces of the inner flaps 23, 24 and are bonded together with an adhesive.

[0026] The lower outer flap 21 is a generally rectangular flat plate, and extends upward from the front edge of the bottom plate 11. The upper outer flap 22 is a generally rectangular flat plate, and extends downward from the front edge of the top plate 12. The outer flaps 21, 22 are arranged with a gap between them, with the leading edges not butted up and down. A finger hook 5, 5 is formed in the center of each leading edge in the left-right direction, which functions as a tear initiation portion (a portion that triggers opening) when opening. As shown in FIG. 2, the finger hook 5 has a substantially semicircular shape and includes an arc-shaped line L6, incisions L5, L5, and an arc-shaped notch 5a. When a finger is inserted through the notch 5a, each piece of the finger hook 5 separated by the incisions L5, L5 is mountain-folded at the line L6 to open in a substantially semicircular shape. This makes it easy to hook the finger when opening.

[0027] A pair of arc-shaped break guiding lines L21, L21 are formed on the left and right sides of the lower outer flap 21. The arc-shaped break guiding lines L21, L21 are for separating the central portion 21a of the lower outer flap 21 from the inner flaps 23, 24 when opening. The arc-shaped break guiding lines L21, L21 are perforated lines with intermittent slits. The interval and shape of the slits are not limited.

[0028] The arc-shaped breakage guiding lines L21, L21 are each formed in an arc shape that is concave downward. The arc-shaped breakage guiding lines L21, L21 extend from the tip edge portions on the left and right sides of the finger hook portion 5 as base ends toward the left and right lower corners of the lower outer flap 21, and are formed so that the mutual separation distance increases from the base end toward the extended end. The arc-shaped breakage guiding lines L21, L21 extend so as to bypass the adhesive region (not shown) between the outer flaps 21, 22 and the inner flaps 23, 24.

[0029] The left inner flap 23 is a generally rectangular flat plate, and extends rightward from the front edge of the left side plate 13. The right inner flap 24 is a generally rectangular flat plate, and extends leftward from the front edge of the right side plate 14. The inner flaps 23, 24 are arranged with a gap between them, with the leading edges in the left-right direction not butting together. As a result, a slit-like gap extending in the up-down direction is formed between the leading edges of the inner flaps 23, 24. This gap functions as an escape area for fingers inserted into the finger hook 5.

[0030] The inner flaps 23, 24 are formed with breakage guide lines L23, L24 extending in the left-right direction. The breakage guide lines L23, L24 are perforated lines with intermittent slits. The intervals and shapes of the slits are not limited.

[0031] 3A, the left break guiding line L23 extends diagonally upward to the left of the inner flap 23 from the vertical center of the tip edge of the inner flap 23 as a base end, and reaches the left edge of the inner flap 23. The right break guiding line L24 is shaped symmetrically to the left break guiding line L23, and extends diagonally upward to the right of the inner flap 23 from the vertical center of the tip edge of the inner flap 24 as a base end, and reaches the right edge of the inner flap 23. In other words, the break guiding lines L23 and L24 are inclined with respect to the tip edge of the upper outer flap 22. 3A, the breakage guide lines L23, L24 overlap (are connected to) a part of the finger hook 5 of the upper outer flap 22 when viewed from the front. As a result, when the user inserts his / her fingers into the finger hook 5 and pulls up the upper outer flap 22 to open the package, the force applied to the finger hook 5 is guided to the left and right breakage guide lines L23, L24.

[0032] A front opening portion 51 (see FIG. 4) is formed on the front end plate 20 by an area defined by the breakage guide lines L23, L24, the upper edge of the upper outer flap 22, and the left and right edges of the upper outer flap 22. The front opening portion 51 constitutes a part of the opening portion 50 provided in the packaging box 1.

[0033] Front support creases L41, L41 that form part of the breaking support creases L40, L40 are formed on the front end plate 20 (upper outer flap 22). As shown in Fig. 3A, the front support creases L41, L41 extend in curved linear fashion from the upper left and right portions of the finger hook portion 5 of the upper outer flap 22 to the upper edge thereof.

[0034] As shown in FIG. 3B, the rear end plate 30 has a pair of upper and lower outer flaps 31, 32 connected to the rear edges of the bottom plate 11 and the top plate 12, respectively, and a pair of left and right inner flaps 33, 34 connected to the rear edges of the left side plate 13 and the right side plate 14, respectively. The outer flaps 31, 32 are superimposed on the outer surfaces of the inner flaps 33, 34 and are bonded together with an adhesive.

[0035] The outer flaps 31, 32 are arranged with a gap between them, without their leading edges butting together in the vertical direction. A finger hook 5 similar to that of the front end plate 20 is formed in the center of the upper outer flap 32 in the horizontal direction. In addition, a pair of arc-shaped break guiding lines L32, L32 are formed on the upper outer flap 32. The arc-shaped break guiding lines L32, L32 are for separating the central portion 32a of the upper outer flap 32 from the inner flaps 33, 34 when the top plate 12 is opened. The arc-shaped break guiding lines L32, L32 are perforated lines with intermittent slits. The interval and shape of the slits are not limited.

[0036] The arc-shaped breakage guiding lines L32, L32 are each formed in an arc shape that convex upward. The arc-shaped breakage guiding lines L32, L32 extend from the tip edge portions on the left and right sides of the finger hook portion 5 as base ends toward the left and right upper corners of the upper outer flap 32, and are formed so that the mutual separation distance increases from the base end toward the extended end. The arc-shaped breakage guiding lines L32, L32 extend so as to bypass the adhesive region (not shown) between the outer flaps 31, 32 and the inner flaps 33, 34.

[0037] The left and right inner flaps 33, 34 are similar to the inner flaps 23, 24 of the front end plate 20, except that they do not include the breakage guide wires L23, L24 (see FIG. 3A).

[0038] As shown in Fig. 1, the left side plate 13 is formed with a left side break guiding line L13 that functions as a break guiding line. Also, the joint piece 16 joined to the left side plate 13 is formed with a left side break guiding line L16 that functions as a break guiding line. As shown in Fig. 3C, the left side break guiding lines L13, L16 are provided so as to substantially overlap when viewed from the left side. As shown in Fig. 2, the left side break guiding lines L13, L16 are perforated lines with intermittent slits. The interval and shape of the slits of the left side break guiding line L13 are not limited. A left opening portion 52 (see FIG. 1) is formed in the left side plate 13 by an area defined by the left side breakage guide lines L13, L16 and the front edge and upper edge of the left side plate 13 (joint piece 16). The left opening portion 52 constitutes a part of the opening portion 50.

[0039] As shown in Figure 1, the left side break induction wires L13, L16 each start from a portion that continues to the left end portion of the break induction wire L23 of the front end plate 20 and extend diagonally upward and rearward toward the upper edge of the left side plate 13 (the front end portion of the upper break induction wire L12).

[0040] 1, a right-side break induction line L14 that functions as a break induction line is formed on the right-side plate 14. The right-side break induction line L14 is symmetrical to the left-side break induction line L13 on the left-side plate 13, and is a perforated line with intermittent slits formed therein, similar to the left-side break induction line L13. As shown in Figure 1, the right side break induction wire L14 starts from a portion that continues to the right end portion of the break induction wire L24 of the front end plate 20 and extends diagonally upward and rearward toward the upper edge of the right side plate 14 (the front end portion of the upper break induction wire L12). A right opening portion 53 is formed on the right side plate 14 by an area defined by the right breaking guide line L14 and the front edge and upper edge of the right side plate 14. The right opening portion 53 (see FIG. 1) constitutes a part of the opening portion 50.

[0041] Rear support creases L44, L44 that form part of the breaking support creases L40, L40 are formed on the rear end plate 30 (upper outer flap 32). As shown in Fig. 3B, the rear support creases L44, L44 are continuous with the top plate front support creases L42, L42, have their base ends at the upper edge of the upper outer flap 32, and extend in curved linear fashion to the upper left and right portions of the finger hook portion 5. The rear support creases L44, L44 are symmetrical to the front support creases L41, L41.

[0042] An opening portion 50 is formed at the front of the packaging box 1 by the front opening portion 51, the left opening portion 52, the right opening portion 53, and the top plate opening portion 54 as described above. The opening portion 50 is cut and cut away by each guide line to form a relatively large opening around the upper corner of the front of the packaging box 1, as shown in Fig. 4. The opening opens toward the front of the front of the packaging box 1, toward both the left and right sides of the front, and toward the upper part of the front.

[0043] As shown in FIG. 1, a pair of left and right break support creases L40, L40 are formed across the front end plate 20, the top plate 12, and the rear end plate 30. As described later, the break support creases L40, L40 support the progress of breakage along each break guide line when the packaging box 1 is opened. The break support creases L40, L40 are formed on the inner surface of the blank sheet S1. Specifically, the break support creases L40, L40 are linear grooves (pressed creases) formed by pressing the inner surface. Therefore, the break support creases L40, L40 do not appear on the outer surface of the packaging box 1.

[0044] As shown in Fig. 2, the break support creases L40, L40 include front support creases L41, L41, top plate front support creases L42, L42, top plate rear support creases L43, L43, and rear support creases L44, L44. Such break support creases L40, L40 have a smooth parabolic shape. In the state of the blank sheet S1, the right break support crease L40 is a curve that convex to the right, and the left break support crease L40 is a curve that convex to the left. The intersection of the break support creases L40, L40 is located to the side (not shown) of the leading edge of the upper outer flap 22 of the front end plate 20, and is located to the side (not shown) of the leading edge of the upper outer flap 32 of the rear end plate 30. As a result, the break support creases L40 are formed so that the separation distance from the other break support crease L40 increases from the finger hook 5 side of the front end plate 20 toward the center of the top plate 12 in the front-to-rear direction, or from the finger hook 5 side of the rear end plate 30 toward the center of the top plate 12 in the front-to-rear direction.

[0045] 1 and 2, the break support creases L40, L40 extend from the upper edge of the upper outer flap 22 at the left and right upper portions of the finger hook portion 5 of the upper outer flap 22, cross the upper edge, and extend to the rear edge of the top plate 12. The break support creases L40, L40 cross the rear edge of the top plate 12, extend to the upper outer flap 32, and reach the upper left and right portions of the finger hook portion 5. In other words, the break support creases L40, L40 cross the entire top plate 12 in the front-to-rear direction, and extend from the top plate 12 to the front end plate 20 and the rear end plate 30.

[0046] When opening the packaging box 1 of this embodiment, the worker inserts his / her fingers into the finger hook 5 of the front end plate 20 and pulls up the front opening portion 51. Then, as shown in Fig. 4, the break guide lines L23 and L24 are cut open to the left and right, and the left and right break guide lines L13 and L14 that are continuous with the break guide lines L23 and L24 are cut open. As a result, the top plate 12 is valley folded along the line L45, and the opening portion 50 is pulled up around the line L45 as a rotation axis, opening the opening.

[0047] When the entire front end plate 20 is to be opened, as shown in Fig. 5, the finger hook 5 of the lower outer flap 21 is pinched with the fingers and the central portion 21a of the outer flap 21 is pulled downward. Then, the arc-shaped break guide lines L21, L21 are cut open and the central portion 21a of the outer flap 21 is separated from the both side edges 21b, 21b of the outer flap 21. 6, the inner flaps 23, 24 are opened to the left and right, whereby the entire front end plate 20 is opened.

[0048] When the entire top plate 12 is to be opened following the opening portion 50, the top plate 12 is cut along the upper break guide lines L12, L12 as shown in Fig. 7. Then, the central portion 32a (see Fig. 3B) of the upper outer flap 32 of the rear end plate 30 is cut in continuation with the top plate 12. In this case, the cutting of the central portion 32a of the outer flap 32 may be performed by tilting the top plate 12 backward to cut open the arc-shaped break guide lines L32, L32, or by pinching the finger hook portion 5 of the outer flap 32 with the fingers and pulling the central portion 32a upward to cut open the arc-shaped break guide lines L32, L32.

[0049] Furthermore, when opening the packaging box 1, it is also possible to cut it open from the rear end plate 30 side to the top plate 12 as shown in Fig. 8. In this case, as in the above, the finger hook portion 5 of the outer flap 32 is pinched with the fingers to cut the center portion 32a from both side edges 32b, 32b, and then the top plate 12 is cut open by pulling it up to the front, thereby opening the packaging box 1 from the rear end plate 30 side to the top plate 12.

[0050] In the packaging box 1 of the present embodiment described above, when the opening portion 50 is pulled up with the fingers starting from the finger hook portion 5, the front end plate 20 (outer flap 22) is bent at the front support lines L41, L41, and the breakage progresses along the breakage guide lines L23, L24. This allows the opening portion 50 to be smoothly cut open. Therefore, the opening operation is easy to perform.

[0051] In addition, the top plate front support creases L42, L42, which are continuous with the front support creases L41, L41, allow breaking to proceed from the break guiding line L23 along the left side break guiding lines L13, L16, and from the break guiding line L24 along the right side break guiding line L14, thereby allowing the opening portion 50 to be opened more smoothly.

[0052] In addition, when the breakage progresses from the front end plate 20 through the left and right side plates 13, 14 to the top plate 12, the breakage progresses from the left break guiding line L13, L16 along the upper break guiding line L12 due to the top plate rear support creases L43, L43 that are continuous with the top plate front support creases L42, L42, and the breakage progresses from the right break guiding line L14 along the upper break guiding line L12. This allows smooth opening from the opening portion 50 to the top plate 12.

[0053] Moreover, by opening the top plate 12 up to the folding line L45, the top plate 12 (opening portion 50) can be used as a lid.

[0054] In addition, since the break support creases L40, L40 are parabolic, the strength of the packaging box 1 can be improved compared to when the break support creases L40, L40 are formed in a straight line.

[0055] Second embodiment A packaging box according to a second embodiment will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a diagram showing a blank sheet of the packaging box according to the second embodiment of the present invention, and Fig. 10 is a perspective view showing the packaging box according to the second embodiment of the present invention when opened. The packaging box 1A of this embodiment differs from the first embodiment in that upper break induction lines L12, L12 are formed over the entire top plate 12, and that it does not have left side break induction lines L13, L16 or right side break induction line L14.

[0056] The top plate 12 is formed with upper break induction lines L12, L12 on the entire left and right edges. Correspondingly, the front end plate 20 is formed with a vertical break induction line L13a connecting the break induction line L23 and the upper break induction line L12 on the left side. Also, the front end plate 20 is formed with a vertical break induction line L14a connecting the break induction line L24 and the upper break induction line L12 on the right side.

[0057] The left vertical break guide line L13a is formed along the left edge of the inner flap 23. On the other hand, the right vertical break guide line L14a is formed along the right edge of the inner flap 24. Each fracture initiation portion is simplified and only includes a notch portion 5a.

[0058] When opening the packaging box 1 of this embodiment, the worker inserts his / her fingers into the notch 5a of the front end plate 20 and pulls up the front opening portion 51. Then, as shown in Fig. 10, the break guide lines L23, L24 are cut open to the left and right, and the vertical break guide lines L13a, L14a and the upper break guide lines L12, L12 that are continuous with the break guide lines L23, L24 are cut open. As a result, the top plate 12 is valley folded along the line L45, and the front opening portion 51 and the top plate opening portion 54 are pulled up around the line L45 as a rotation axis, opening the opening.

[0059] In addition, when opening the entire front end plate 20, when opening the entire top plate 12 following the top plate opening portion 54, and when opening from the rear end plate 30 side to the top plate 12, the same procedure as in the first embodiment can be performed.

[0060] The packaging box 1A of this embodiment also provides the same effects as those of the first embodiment. In addition, the front support creases L41, L41 and the top plate front support creases L42, L42 are continuous from the front end plate 20 to the top plate 12. Therefore, the break progresses smoothly from the vertical break guide lines L13a, L14a to the upper break guide lines L12, L12, and there is no risk of the break deviating from the guide line or the break progress stopping at the corner between the front end plate 20 and the top plate 12. Therefore, the opening operation is easy to perform.

[0061] 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. For example, in each of the above embodiments, the base ends of the front support lines L41, L41 and the rear support lines L44, L44 are located above the finger hook portion 5 or above the cutout portion 5a, but this is not limited to this and may be located at the tip edges of the outer flaps 22, 32.

[0062] In addition, in each of the above-described embodiments, the present invention is applied to the wrap-around type packaging boxes 1, 1A, but the present invention may also be applied to A-type packaging boxes.

[0063] Furthermore, the breaking support lines L40, L40 are formed on the inner surfaces of the blank sheets S1, S2, but they may be formed on the outer surfaces, or on both the inner and outer surfaces.

[0064] Further, the breakage guide wires L23, L24 are configured to overlap (be connected to) a part of the finger hook 5, but are not limited to this.

[0065] Moreover, the break support creases L40, L40 may be straight lines.

[0066] The packaging boxes 1, 1A of the present embodiment are made of corrugated cardboard, but the packaging boxes may also be made of various known paperboards. [Explanation of symbols]

[0067] 1 packaging box 1A packaging box 5 Finger hook (break start part) 5a Notch 11 Bottom plate 12 Top plate 13 Left side plate (side plate) 14 Right side plate (side plate) 16 Joint piece 20 Front end plate 30 Rear end plate 50 Opening part L40 Break support crease L23 Breaking induction wire L24 Breaking Induction Wire L45 folding line X1 reference line

Claims

1. The bottom plate and A pair of left and right side plates connected to left and right edges of the bottom plate; a top plate connected to an upper edge of one of the side plates; A pair of front and rear end plates; A packaging box including a break guide line formed so as to be openable across the front end plate, the top plate, and the rear end plate, The two end plates are A tearing portion that is opened by a tearing initiation portion that serves as a starting point when opening; A fracture support crease is formed symmetrically with respect to a reference line passing through the fracture start portion in the vertical direction, The packaging box according to claim 1, wherein the breaking support crease is formed continuously across the front end plate, the top plate, and the rear end plate.

2. 2. The packaging box according to claim 1, wherein the break initiation portion is connected to the break induction wire.

3. 3. The packaging box according to claim 1, wherein the top plate is formed with a folding line perpendicular to the upper edge of the side plate.

4. The packaging box according to any one of claims 1 to 3, wherein the breaking support crease is parabolic.

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