Packaging box

Abstract

To provide a packaging box which can be easily divided into upper and lower parts into a tray shape.SOLUTION: The packaging box 1 has: a pair of side panels 3; a bottom panel 5 connecting the lower edges of the side panels 3; and a top panel 6 connecting the upper edges of the side panels 3; a pair of inner flaps 22 connected to the side panels 3 with their leading edges facing each other; outer flaps 21, 23 connected to the top panel 6 and the bottom panel 5 with their leading edges narrow and convex, their leading edges abutting each other and bonded to the outside of the inner flap 22, a recess 200 sandwiched between the ends of the leading edges of the outer flaps 21, 23 and exposing the inner flap 22 to the outside, a strip-shaped breaking portion 30 connecting both side edges of the side panels 3 and extending along the middle portion, a breaking initiation portion 40a provided in the recess 200 and connected to the strip-shaped breaking portion 30, and a leading edge breakable line 50 provided in a region of the inner flap 22 overlapping with the outer flaps 21, 23, extending from the breaking initiation portion 40 to the leading edge of the inner flap 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art Wrap-around case type packaging boxes have been used conventionally as packaging boxes for transporting and displaying food products such as beverage cans, beverage bottles, cup noodles, and cup soups.

[0003] A known packaging box of this type has a rectangular tubular body extending horizontally and a pair of closing portions each closing the open ends of the body, the body having a pair of opposing side panels, a bottom panel connecting the lower edges of the pair of side panels, and a top panel connecting the upper edges of the pair of side panels, the closing portions being connected to the side panels and having a pair of inner flaps with their leading edges facing each other, a pair of outer flaps being connected to the top panel and bottom panel and having narrow convex leading sides with the middle portions of their leading edges abutting each other and overlapping and adhered to the outside of the inner flaps, and a recessed portion which is an area sandwiched between the ends of the opposing leading edges of the pair of outer flaps and exposes the inner flaps to the outside (see, for example, Patent Document 1).

[0004] In this conventional packaging box, a tear tape is attached to the inside surface of both inner flaps that sandwich the side panels so as to connect the leading edges of the two inner flaps. An inverted H-shaped cut is formed across the tear tape at a position corresponding to the recess of the inner flap.

[0005] In conventional packaging boxes, the side panel is torn by pinching and pulling half of the side panel of the H-cut with the tear tape, and the tip of the inner flap is torn by pinching and pulling the remaining half of the tip of the inner flap of the H-cut. This allows the upper part of the conventional packaging box, which is divided into upper and lower parts, to be removed, and the products stored in the tray-shaped lower part to be displayed as they are. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-209148 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, with conventional packaging boxes, when pinching the remaining half of the tip side of the H-cut inner flap to tear the tip of the inner flap, the tip edges of the outer flaps are butted together, which presents a problem in that it is not easy to pull the tearing tape outward from the gap to tear the inner flap.

[0008] In view of the above, an object of the present invention is to provide a packaging box that can be easily separated into an upper and lower part into a tray shape. [Means for solving the problem]

[0009] (1) The packaging box of the present invention comprises a rectangular tubular body portion extending horizontally and a pair of closing portions each closing an open end of the body portion, The body portion has a pair of side plates facing each other, a bottom plate connecting lower edges of the pair of side plates, and a top plate connecting upper edges of the pair of side plates, the closing portion is connected to the side panels, and has a pair of inner flaps whose leading edges face each other; a pair of outer flaps which are connected to the top panel and the bottom panel, and have narrow convex leading sides, and the middle parts of the leading edges are butted against each other and overlapped with and bonded to the outside of the inner flaps; and a recess which is an area sandwiched between the ends of the leading edges facing each other of the pair of outer flaps and exposes the inner flaps to the outside, a band-shaped breakable portion provided on the side plate and sandwiched between a pair of side plate breakable lines extending along a vertical middle portion while connecting both side edges; A break initiation portion provided in the recess of the inner flap and connected to the band-shaped break portion; a tip breakable line provided in an area of ​​the inner flap where the inner flap overlaps with the pair of outer flaps, the tip breakable line passing through a gap between an adhesive portion between the outer flap connected to the top plate and an adhesive portion between the outer flap connected to the bottom plate and extending from the breakable start portion to a tip edge of the inner flap; (hereinafter referred to as "the packaging box of the first invention").

[0010] In the packaging box of the first invention, a tear initiation portion is formed in the recess where the inner flap is exposed to the outside, so that the tear initiation portion can be folded toward the inside of the packaging box by pushing this portion toward the inside of the packaging box with one's fingers.

[0011] In addition, since the break initiation portion is connected to the strip-shaped break portion, by pinching the broken break initiation portion and the end of the strip-shaped break portion with the fingers and pulling them to the outside of the packaging box, the side panel is broken along the pair of side panel breakable lines, and the strip-shaped break portion can be peeled off from the side panel. Since this strip-shaped break portion is provided in the vertical middle of the side panel, the side panel is divided into an upper part and a lower part.

[0012] In addition, since the strip-shaped breaking portion is connected to the tip breakable line and this tip breakable line passes through the gap where the upper and lower outer flaps are attached, by inserting both hands into the side panels through the gap created by the strip-shaped breaking portion being peeled away and pulling the packaging box apart vertically, the inner flap can be broken along the tip breakable line up to its tip edge, and the entire packaging box can be divided into upper and lower halves.

[0013] Therefore, according to the packaging box of the first aspect of the present invention, the packaging box can be easily divided into upper and lower halves to form a tray.

[0014] (2) In addition, the packaging box of the present invention is the packaging box of the first invention, The tip breakable line is characterized in that it is formed offset upward or downward from the vertical position where the middle portions of the tip edges of the pair of outer flaps are abutted against each other (hereinafter referred to as the "packaging box of the second invention").

[0015] According to the second packaging box of the present invention, in short, the tip breakable line is provided at a position offset from the middle of the tip edges of both outer flaps, so that when both hands are inserted into the side panels and the packaging box is pulled apart vertically to break the inner flaps along the tip breakable line, even if a twisting movement occurs at the top of the packaging box, the outer flaps can act as a guide to regulate this, allowing a breaking force to be applied vertically to the tip breakable portion.

[0016] Therefore, according to the packaging box of the second invention, the packaging box can be easily divided into upper and lower halves to form a tray.

[0017] (3) Furthermore, the packaging box of the present invention is characterized in that in the packaging box of the first or second invention, the tip breakable line has an inclined portion at its base end that inclines upward.

[0018] In the packaging box of the third aspect of the present invention, the base end of the tip breakable line has an inclined portion that slopes upward, so that in the initial stage of pulling the packaging box apart from the top and bottom to break the inner flap along the tip breakable line, it can be broken with a relatively small force.

[0019] Therefore, according to the packaging box of the third aspect of the present invention, the packaging box can be easily divided into upper and lower halves to form a tray. [Brief description of the drawings]

[0020] [Figure 1] 1 is a perspective view showing a packaging box according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a development view of the paperboard of the packaging box according to the first embodiment of the present invention. [Diagram 3] 2 is a partially enlarged plan view showing details of the band-shaped breaking portion, the start breakable line, the tip breakable line, the first auxiliary breakable line, and the second auxiliary breakable line of the packaging box according to the first embodiment of the present invention. FIG. [Figure 4] 1 is a partial front view showing a relationship between a lower outer flap and an upper outer flap of a packaging box according to a first embodiment of the present invention and a band-shaped breaking portion. FIG. [Diagram 5]FIG. 2 is a partial perspective view showing a state in which a broken piece is picked up after a breaking initiation portion is broken during a process of opening the packaging box according to the first embodiment of the present invention. [Figure 6] 1 is a perspective view showing a state in which a side panel breakable line on one side is broken to remove a break initiation portion and an opening breakable portion during a process of opening the packaging box according to the first embodiment of the present invention; FIG. [Figure 7] FIG. 2 is a perspective view illustrating a state in which both tear initiation portions and tearable portions for opening have been removed during the process of opening the packaging box according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a perspective view illustrating a state in which an upper half of a packaging box has been removed, during a process of opening the packaging box according to the first embodiment of the present invention. [Figure 9] FIG. 2 is a perspective view showing a state in which the upper half of the packaging box has been removed to expose products stored in the lower half, during a process of opening the packaging box according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a partial plan view showing the configuration of a comparative sample in an experimental example of the packaging box according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] [Configuration of packaging box 1 according to one embodiment] A packaging box 1 according to one embodiment of the present invention (hereinafter simply referred to as "this embodiment") will be described below with reference to Figures 1 to 3. As shown in Figure 1, the packaging box 1 of this embodiment is a wrap-around case type box formed in a rectangular parallelepiped shape.

[0022] The packaging box 1 of this embodiment is formed by a pair of opposing side plates 3, a body 4 formed by combining a pair of opposing top and bottom plates 6 and 5 in an orthogonal direction, and a closing portion 2 that closes the open end of the body 4. The bottom plate 5 connects the lower edges of the pair of side plates 3, and the top plate 6 connects the upper edges of the pair of side plates 3.

[0023] The packaging box 1 of this embodiment is formed in a horizontally elongated shape with its height (length in the vertical direction) shorter than its width (length in the horizontal direction) when viewed from the side panel 3 side.

[0024] The closure portion 2 is composed of a pair of inner flaps 22 respectively connected to the upper and lower edges (upper and lower directions in Figure 2, the same below) of the first and second side panels 12, a pair of lower outer flaps 21 respectively connected to the upper and lower edges of the bottom panel 5, and a pair of upper outer flaps 23 respectively connected to the upper and lower edges of the top panel 6.

[0025] More specifically, a cylindrical packaging box precursor is formed by the bottom plate 11, a pair of side plates 12, and a top plate 13. Then, the pair of inner flaps 22 of the side plate 12 are folded so that their leading edges butt against each other, the lower outer flap 21 of the bottom plate 11 overlaps with the upper surface of the pair of inner flaps 22, and the upper outer flap 23 of the top plate 13 overlaps with the upper surface of the pair of inner flaps 22, and the lower outer flap 21, the upper outer flap 23, and the inner flap 22 are fixed by adhesion to form the closure portion 2 and seal the box.

[0026] 1, a band-shaped breaking portion 30 consisting of a pair of parallel side panel breakable lines 30a, 30b is formed in the vertical center of the side panel 12 up to the tip of each inner flap 22 at both ends of the side panel 12. Also, in each inner flap 22 near the side inner flap fold line b2, a breaking start portion 40a is formed by a starting breakable line 40 whose tip side is closed in an arc shape at a position that is wider than the side panel breakable lines 30a, 30b and overlaps them.

[0027] The lower outer flap 21 and the upper outer flap 23 have a narrow convex shape at their tip ends, and the middle parts of their tip edges abut against each other, so that in the area sandwiched between the ends of the tip edges of the lower outer flap 21 and the upper outer flap 23, a recess 200 is formed in which the fracture initiation portion 40a of the inner flap 22 is exposed to the outside.

[0028] Furthermore, a tip breakable line 50 extending from the tip of each inner flap 22 to the arc-shaped closed breakable line 43 at the tip of the break initiation portion 40a is formed in the region between the side panel breakable lines 30a, 30b (see FIG. 3).

[0029] In addition, first auxiliary breakable lines 60a, 60b are formed on both ends of the longitudinal direction of the strip-shaped breaking portion 30 at positions spaced apart in the width direction, and second auxiliary breakable lines 70a, 70b are formed on the center side. The strip-shaped breaking portion 30, the start breakable line 40, the tip breakable line 50, the first auxiliary breakable lines 60a, 60b, and the second auxiliary breakable lines 70a, 70b will be described in detail later.

[0030] [Composition of 1x corrugated cardboard] Next, the configuration of the corrugated paperboard (blank) 1X forming the packaging box 1 will be described.

[0031] As shown in an exploded view in Fig. 2, the packaging box 1 is formed from one piece of corrugated paperboard 1X. Fig. 2 shows the back side of the corrugated paperboard 1X, which will be the inner side when assembled into the packaging box 1.

[0032] 2, the corrugated cardboard 1X comprises a first side panel 12, a bottom panel 11 (corresponding to the bottom panel 5 of the present invention) connected to the left edge of the first side panel 12 via the body fold line a, a second side panel 12 connected to the left edge of the bottom panel 11 via the body fold line a, and a top panel 13 (corresponding to the top panel 6 of the present invention) connected to the left edge of the second side panel 12 via the body fold line a. Furthermore, an adhesive piece 14 is connected to the left edge of the top panel 13 via the body fold line a.

[0033] The first side panel 12 has an upper end edge connected to the inner flap 22 via a side inner flap fold line b2, and a lower end edge connected to the inner flap 22 via a side inner flap fold line b2.

[0034] The bottom plate 11 has a lower outer flap 21 connected to its upper edge via a lower outer flap fold line b1, and a lower outer flap 21 connected to its lower edge via a lower outer flap fold line b1.

[0035] At the tip side of both side ends of the lower outer flap 21, a lower recess 80a is formed by the lower outer cut line 80. As a result, the tip side of the lower outer flap 21 has a narrow convex shape. The convex portion other than the area where the lower recess 80a is formed becomes the middle part of the tip edge of the lower outer flap 21.

[0036] As shown clearly in Fig. 4, the lower outer cutout line 80 is cut inwardly from a position that is about 70% of the height of the lower outer flap 21 (the vertical height in Fig. 2, the same below), drawing an outwardly convex arc, and then cuts out from a point that has drawn a 1 / 4 arc inwardly convex arc to the tip of the lower outer flap 21. The horizontal width of the lower recess 80a is longer than its vertical height.

[0037] The second side panel 12 has an upper end edge connected to the inner flap 22 via a side inner flap fold line b2, and a lower end edge connected to the inner flap 22 via a side inner flap fold line b2.

[0038] The top plate 13 has an upper outer flap 23 connected to its upper edge via an upper outer flap fold line b3. The top plate 13 has an upper outer flap 23 connected to its lower edge via an upper outer flap fold line b3.

[0039] At the tip side of both side ends of the upper outer flap 23, an upper recess 90a is formed by an upper outer cut line 90. As a result, the tip side of the upper outer flap 23 has a narrow convex shape. The convex portion other than the area where the upper recess 90a is formed becomes the middle part of the tip edge of the upper outer flap 23.

[0040] As shown clearly in Fig. 4, the upper outer cutout line 90 is cut inwardly from a position that is about 70% of the height of the upper outer flap 23 (the vertical height in Fig. 2, the same applies below), drawing an outwardly convex arc, and then cuts out from a point that has drawn a 1 / 4 arc in an inwardly convex arc to the tip of the upper outer flap 23. The horizontal width of the upper recess 90a is longer than its vertical height.

[0041] The lower outer cutout line 80 and the lower recess 80a, and the upper outer cutout line 90 and the upper recess 90a are symmetrical with each other, being mirror images in the up-down direction of a line segment including the abutting portion, when the lower outer flap 21 and the upper outer flap 23 are abutted against each other. As will be described later, the lower recess 80a and the upper recess 90a form a recess 200.

[0042] Next, the band-shaped breakable portions 30 of the first and second side plates 12 will be described.

[0043] 2 and 3, a pair of side panel breakable lines 30a, 30b are formed linearly from one end to the other end of the first and second side panels 12, sandwiching the center in the width direction of the first and second side panels 12. The area between the pair of side panel breakable lines 30a, 30b becomes the band-shaped breakable portion 30. The side panel breakable lines 30a, 30b can be formed by perforations or the like that are used as ordinary breakable lines.

[0044] The width w1 of the strip-shaped breaking portion 30 may be any width that provides the strength to transmit the breaking force to the unbroken region without tearing the strip-shaped breaking portion 30 when peeled off from the first and second side panels 12. Specifically, the width w1 should be about 5 times the thickness t of the corrugated cardboard material, i.e., w1 ≈ 5t.

[0045] Next, the fracture initiation portion 40a will be described.

[0046] The break initiation portion 40a is formed from the side inner flap fold line b2, which is the boundary line between the first and second side panels 12 and the inner flap 22, to its center (the center in the left-right direction in Figure 2, the same applies below), and is formed within the inner flap 22 on the base end side to about 1 / 3 of the height (height in the up-down direction) of the inner flap 22, and is formed by an initiation breakable line 40, which is a breakable line formed in an inverted U-shape overall.

[0047] The break initiation portion 40a is formed at a predetermined interval outside the strip-shaped break portion 30 so as to enclose the strip-shaped break portion 30, and is connected to the strip-shaped break portion 30 so as to enclose the strip-shaped break portion 30, and the strip-shaped break portion 30 can be broken continuously from the breaking operation by the break initiation portion 40a.

[0048] 3, the start breakable line 40 is formed of a pair of first breakable lines 41 formed in a V-shape so as to continue and shrink from first auxiliary breakable lines 60a, 60b described below, a pair of second breakable lines 42 that are wider than the side panel breakable lines 30a, 30b and extend linearly from the ends of the first breakable lines 41 so as to include them, and a closed breakable line 43 that connects the tips of the second breakable lines 42 in an arc shape. The start breakable line 40 is formed by a perforation or the like used as a normal breakable line.

[0049] The break initiation portion 40a is formed symmetrically with respect to the center line in the left-right direction (left-right direction in FIG. 2) of the inner flap 22. The width w2 between the pair of second possible break lines 42 is wider than the width w1 between the pair of side panel possible break lines 30a, 30b, and is not particularly limited, but is, for example, about 1.4 times the width w1, i.e., w2≈1.4w1.

[0050] The radius r1 of the circular arc of the occlusion break line 43 is not particularly limited, but for example, is approximately 1 / 2 the narrow width region w3 of the first auxiliary breakable lines 60a, 60b described below, ie, r1≈1 / 2w3.

[0051] As shown in FIG. 3, the length L1 of the inner flap 22 of the break initiation portion 40a in the height direction (the vertical direction in FIG. 2) is not particularly limited, but is, for example, approximately the same as the width w2 between the second breakable lines 42 or approximately 1.5 times the width w1 between the side panel breakable lines 30a, 30b, i.e., L1 ≈ 1.5w1.

[0052] The tear initiation portion 40a is formed in contact with the side inner flap fold line b2, and is formed up to a position at a height of about 1 / 3 of the height of the inner flap 22. Therefore, the portion of the inner flap 22 near the side inner flap fold line b2 around the tear initiation portion 40a is supported by the first and second side plates 12.

[0053] Furthermore, as best shown in Figure 4, when the lower outer flap 21 and the upper outer flap 23 are folded and overlapped with the inner flap 22, the recess 200 formed by the lower recess 80a of the lower outer flap 21 and the upper recess 90a of the upper outer flap 23 exposes the breakage initiation portion 40a without being covered by the lower outer flap 21 and the upper outer flap 23.

[0054] Since the back surfaces of the lower outer flap 21 and the upper outer flap 23 are bonded to the surface of the inner flap 22, the inner flap 22 around the breaking initiation portion 40a covered by these is supported by the lower outer flap 21 and the upper outer flap 23.

[0055] Next, the tip breakable line 50 will be described.

[0056] The leading edge breakable line 50 is formed so as to extend from the closing breakable line 43 of the starting breakable line 40 to the leading edge of the inner flap 22 and connect the two. Even if the end of the leading edge breakable line 50 and the leading edge of the inner flap 22 are somewhat separated from each other, the leading edge breakable line 50 is considered to extend between them and connect them.

[0057] The tip breakable line 50 consists of a first tip break line 51 extending in a straight line toward the tip side of the inner flap 22, and an arc-shaped second tip break line 52 (corresponding to the inclined portion of the present invention) connecting the end of this first tip break line 51 to the occlusion break line 43.

[0058] The first tip break line 51 is formed between the pair of side panel breakable lines 30a, 30b, and is formed biased toward the bottom plate 11 side from the widthwise center of the pair of side panel breakable lines 30a, 30b.

[0059] The widthwise centers of the pair of side panel breakable lines 30a, 30b are the same as the left-right center of the inner flap 22 (left-right direction in Figure 2, the same below), and coincide with the abutting portions of the tip edges of the lower outer flap 21 and the upper outer flap 23 when the lower outer flap 21 and the upper outer flap 23 are folded and overlapped on the inner flap 22.

[0060] 4, the distance s between the left-right center of the inner flap 22 and the first tip breaking line 51 is not particularly limited, but is, for example, about 1 / 6 of the distance w1 between the two side panel breakable lines 30a, 30b. Since the first tip breaking line 51 is formed biased toward the bottom plate 11, it is covered by the lower outer flap 21 when the lower outer flap 21 and the upper outer flap 23 are folded.

[0061] The second tip break line 52 inclines upward (toward the top plate 13) from the lower part of the closed break line 43 (about 1 / 3 of the distance from the center to the lower end of the closed break line 43 toward the center), extends in an upward convex arc, and is connected to the end of the first tip break line 51 on the side inner flap fold line b2 side at a position of about 1 / 8 of the arc. The second tip break line 52 becomes the inclined part of the tip breakable line 50. Note that since the end of the arc of the first tip break line 51 and the closed break line 43 are very slightly separated, the two are connected by a straight breakable line (cut line).

[0062] The radius r2 of the arc of the second tip break line 52 is not particularly limited, but is, for example, about 2 / 3 of the width w1 between the side panel breakable lines 30a, 30b, ie, r2≈2 / 3w1.

[0063] The first tip break line 51 and the second tip break line 52 can be formed by perforations or the like that are used as normal breakable lines. The second tip break line 52 may have an uncut region of a certain width, for example, about 1 / 3 of the width w1, between the tip edge of the inner flap 22. By having such an uncut region, the line is protected from unintended breakage, and the length of the uncut region does not interfere with the breaking operation of the entire tip breakable line 50.

[0064] Next, the first auxiliary breakable lines 60a, 60b will be described.

[0065] 3, the pair of first auxiliary breakable lines 60a, 60b are connected to the first breakable line 41 and are formed from the side inner flap fold line b2 toward the center in the longitudinal direction of the first and second side panels 12. The first auxiliary breakable lines 60a, 60b have a narrow region formed from the side inner flap fold line b2 and a wide region that widens from the narrow region and is formed toward the center in the longitudinal direction of the first and second side panels 12.

[0066] The width w3 of the narrow region is wider than the width w2 between the second breakable lines 42, and is not particularly limited, but for example, about 1.8 times the width w1 between the side panel breakable lines 30a, 30b, i.e., w3≈1.8w1. The width w4 of the wide region is wider than the width w3 of the narrow region, and is not particularly limited, but for example, about 2.1 times the width w1, i.e., w4≈2.1w1.

[0067] The length L2 of the first auxiliary breakable lines 60a, 60b is not particularly limited, but is, for example, about 2.2 times the length L1 of the break initiation portion 40a, that is, L2≈2.2L1.

[0068] Next, the second auxiliary breakable lines 70a, 70b will be described.

[0069] 3, the pair of second auxiliary breakable lines 70a, 70b are formed at a distance L3 from the first auxiliary breakable lines 60a, 60b toward the center in the longitudinal direction of the first and second side plates 12. The length of the distance L3 is not particularly limited, but is approximately the same as the length L2 of the first auxiliary breakable lines 60a, 60b, i.e., L3≈L2.

[0070] The second auxiliary breakable lines 70a, 70b have wide regions formed on both end sides and narrow regions formed by narrowing from these wide regions toward the center portions of the second auxiliary breakable lines 70a, 70b.

[0071] The width w5 of the wide region is approximately the same as the width w4 of the wide region of the first auxiliary breakable lines 60a, 60b, i.e., w5≈w4. The width w6 of the narrow region is approximately the same as the width w3 of the narrow region of the first auxiliary breakable lines 60a, 60b, i.e., w6≈w3.

[0072] The length L4 of the second auxiliary breakable lines 70a, 70b is not particularly limited, but is, for example, approximately twice the length L2 of the first auxiliary breakable lines 60a, 60b, that is, L4≈2L2.

[0073] The break initiation portion 40a, the tip breakable line 50, the first auxiliary breakable lines 60a, 60b, and the second auxiliary breakable lines 70a, 70b are formed symmetrically from the center in the longitudinal direction toward both ends. In other words, they are formed symmetrically as a mirror image with respect to a short-side straight line passing through the center in the longitudinal direction of the first and second side plates 12.

[0074] The second auxiliary breakable lines 70a, 70b on one end side and the second auxiliary breakable lines 70a, 70b on the other end side are formed with a gap L5 between them. The length of the gap L5 is not particularly limited, but is, for example, about 0.55 times the length L4 of the second auxiliary breakable lines 70a, 70b, i.e., L5≈0.55L4.

[0075] [Assembly of packaging box 1] Next, the assembly of the packaging box 1 will be described with reference to FIG.

[0076] To form a packaging box 1 using the corrugated paperboard 1X, first, an item to be packaged, such as instant noodles, is placed on the bottom plate 11.

[0077] Next, the first and second side panels 12 connected to both the left and right ends (meaning the left and right in FIG. 2, the same applies below) of the bottom panel 11 are raised by valley folding along the trunk crease line a. Next, the top panel 13 connected to the left second side panel 12 is bent 90° relative to the second side panel 12 by valley folding along the trunk crease line a, so that it faces the bottom panel 11.

[0078] At this time, the adhesive piece 14 connected to the left side of the top plate 13 is also folded 90° with respect to the top plate 13 by making a valley fold along the body fold line a. Next, the back surface of the adhesive piece 14 and the surface near the open end of the first side plate 12 are adhered to each other to form the cylindrical body 4.

[0079] Next, each of the inner flaps 22 connected to the first and second side panels 12 is folded 90° toward the inside of the packaging box 1 along the inner flap fold line b2, and their leading edges are brought into contact with each other. Next, the lower outer flap 21 connected to the bottom panel 11 is folded 90° toward the inside of the packaging box 1 along the lower outer flap fold line b1, and is overlapped with the outer surface of the inner flap 22.

[0080] Next, the upper outer flap 23 connected to the top plate 13 is folded 90° toward the inside of the packaging box 1 along the upper outer flap fold line b3, and overlapped with the outer surface of the inner flap 22. As a result, the narrow convex portion on the tip side of the lower outer flap 21 and the narrow convex portion on the tip side of the upper outer flap 23 are butted against each other and face each other.

[0081] At this time, as described above, the recess 200 is formed by the lower recess 80a of the lower outer flap 21 and the upper recess 90a of the upper outer flap 23. As a result, the breakage initiation portion 40a is exposed to the outside through the recess 200 without being covered by the lower outer flap 21 and the upper outer flap 23.

[0082] Finally, the outer surface of the inner flap 22, the inner surface of the lower outer flap 21, and the inner surface of the upper outer flap 23 are fixed together with a folding material to form the closure part 2. At this time, care is taken not to allow adhesive to adhere to the leading edge breakable line 50 or its vicinity. This completes the packaging box 1, and the product is sealed.

[0083] [Unpacking the box] Next, the operation of opening the packaging box 1 using the breaking initiation portion 40a and the strip-shaped breaking portion 30 will be described with reference to Figs.

[0084] To open the packaging box 1 of this embodiment, first, as shown in Figure 5, the worker presses the break initiation portion 40a inward with his / her finger to successively break the closure break line 43, the second breakable line 42, and the first breakable line 41.

[0085] At this time, the broken pieces of the breaking initiation portion 40a remain pushed inside the box, so they can be picked up and pulled out.

[0086] Then, when the breaking fragment of the breaking initiation portion 40a is pulled further outward, the upper and lower side panel breakable lines 30a, 30b forming the band-shaped breaking portion 30 break, and the band-shaped breaking portion 30 is sequentially cut away from the inner flap 22 and the first or second side panel 12.

[0087] Furthermore, as the broken fragments of the strip-shaped breaking portion 30 are pulled and advanced through the breaking zone toward the other end, as shown in FIG. 6, the broken fragments of the strip-shaped breaking portion 30 pass through the corner on the other end of the first or second side panel 12 and enter the inner flap 22 on the other end, and are cut off up to the breaking initiation portion 40a on the other end.

[0088] In this case, even if the breaking area cut into a strip shape deviates from the strip-shaped breaking portion 30 and bends, when the breaking area reaches the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b on either side, the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b will break, and the breaking area will break along the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b.

[0089] In this way, the breaking zone is oriented laterally between the upper and lower first auxiliary breakable lines 60a, 60b or the second auxiliary breakable lines 70a, 70b, thereby preventing the breaking zone from deviating too far from the strip-shaped breaking portion 30 and being torn off.

[0090] A similar operation is performed on the break initiation portion 40a formed on the inner flap 22 of the other first or second side panel 12, resulting in a packaging box having a break opening 300 from which the break initiation portion 40a and the strip-shaped break portion 30 have been removed, as shown in Figure 7.

[0091] Next, a hand is placed on any location of one of the breakable openings 300, and the upper half of the packaging box is pulled upward. Then, in the inner flap 22 immediately adjacent to the location where the hand is placed, the second leading edge break line 52 and the first leading edge break line 51 of the leading edge breakable line 50 are broken in sequence, and the inner flap 22 is broken into two from the leading edge breakable line 50.

[0092] Furthermore, when the upper half of the packaging box is pulled upward, the remaining three tip breakable lines 50 are broken one by one, and the upper half of the packaging box is completely separated from the lower half, as shown in Fig. 8. At this time, if necessary, it is advisable to change the location where you place your hands to the vicinity of the part that has not yet been broken.

[0093] In this state, the lower and upper halves of the packaging box are in the shape of a tray. The breaking portion of the breaking piece of the lower inner flap 22 at the leading edge breaking line 50 is located below the upper edge of the lower outer flap 21 (the upper and lower sides in FIG. 8, the same applies below).

[0094] This is because the first tip breakable line 51 is formed offset by the distance s toward the bottom plate 11 from the center in the vertical direction of the inner flap 22. Therefore, the break portion of the tip breakable line 50 in the breakable piece of the upper half of the inner flap 22 is located above the upper end edge of the upper outer flap 23 by the distance s.

[0095] At this time, the packaged items, such as instant noodles, stored in the packaging box are aligned in the lower half of the tray, and the upper part is exposed when the box is opened, as shown in Figure 9. Therefore, the items can be displayed and sold in this state in stores, etc.

[0096] [Experimental Example] The frangibility of the tip frangible wire 50 of this embodiment was evaluated by carrying out the following experiment in order to confirm its effect.

[0097] In a packaging box 1 having the tip breakable line 50 of this embodiment on the inner flap 22 (hereinafter simply referred to as the sample), and in a packaging box 1 having the tip breakable line 50x of the shape shown in Figure 10 on the inner flap 22 (hereinafter simply referred to as the comparison sample), the break initiation portion 40a and the band-shaped break portion 30 were removed, and the break opening 300 was left, the strength of the said portion at the time of break was measured, and the ease of breakage was evaluated.

[0098] In the comparative sample, the break initiation portion 40a was formed in the same manner as in the present embodiment, and the leading edge breakable line 50x was formed as a straight line only. In addition, the leading edge breakable line 50x was not formed at a biased position as in the present embodiment, but was formed at the center position in the left-right direction (left-right in FIG. 2) of the inner flap.

[0099] First, five packaging boxes 1 having a sample and a comparative sample on the inner flap 22 of the first or second side panel 12 were prepared, and these were sealed with hot melt. At this time, the samples were formed on the inner flaps 22 at both ends of the first side panel 12, and the comparative samples were formed on the inner flaps 22 at both ends of the second side panel 12, and the number of each sample was adjusted to 10.

[0100] Thereafter, the sample was left in an environment of 23°C and 50% RH for 24 hours or more.

[0101] Next, the break initiation portion 40a at one end of the first or second side panel 12 of the sealed packaging box was broken, and the strip-shaped breaking portion 30 was pulled and cut up to the break initiation portion 40a at the other end. The same operation was performed on the remaining first or second side panel 12, resulting in the state shown in FIG.

[0102] At this time, the breaking area cut into a strip may deviate from the strip-shaped breaking portion 30, but when the breaking area reaches the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b, the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b breaks, and the breaking area does not deviate outward from the first auxiliary breakable line 60a, 60b or the second auxiliary breakable line 70a, 70b.

[0103] Next, a hook attached to a force measuring device was attached to one end of the second side panel 12 at the break opening 300 formed by the break initiation portion 40a, and a force was applied diagonally upward while holding down the lower half of the packaging box, breaking and separating the sample or comparative sample at that point, and the maximum force (maximum pulling force) at this time was read.

[0104] The force measuring device used was a Nidec-Shimpo digital force gauge FGP-50, with a hook-shaped jig attached to the tip.

[0105] The same operation was carried out a total of 10 times for each sample and the comparative sample, and the average traction force at break was calculated. The results were 32.0N for the sample and 37.6N for the comparative sample.

[0106] From the above results, it is evident that the sample of this embodiment breaks under a smaller pulling force than the comparative sample.

[0107] Next, the effects of this embodiment will be described.

[0108] In the packaging box 1 of this embodiment, instead of a so-called H-cut in which a large H-shaped slit is made, a tear initiation portion 40a is formed by a perforation. This makes it possible to suppress a decrease in the load capacity at the corners of the body portion 4, which are areas where the load acts heavily when a load acts on the packaging box 1 from above.

[0109] The portion of the inner flap 22 around the tear starting portion 40a close to the side inner flap fold line b2 is supported by the first and second side plates 12, so that the tear starting portion 40a is structured to be resistant to bending due to a force pushing in. The rest of the area around the tear starting portion 40a is supported by the lower outer flap 21 and the upper outer flap 23, so that the area is similarly structured to be resistant to bending. This makes it easy to push in the tear starting portion 40a and break it.

[0110] In addition, the periphery of the break initiation portion 40a is adhesively fixed to the lower outer flap 21 and the upper outer flap 23, and when the break initiation portion 40a is pushed inside the packaging box, the ridge line between the inner flap 22 and the side panel 12 (side inner flap fold line b2) becomes the pivot axis of the break initiation portion 40a, so no new fold line is required to create the pivot axis, and it can be formed on the base end side near the ridge line with the side panel 12.When the break initiation portion 40a is pushed inside the packaging box, the break initiation portion 40a is easily broken along the break initiation line 40.

[0111] The narrow regions of the first auxiliary breakable lines 60a, 60b and the second auxiliary breakable lines 70a, 70b can be formed in the middle or end portions of these lines, and the wide regions can be formed at the ends thereof, thereby widening the area for accepting a breakable region that deviates from the band-shaped breakable portion 30, while also correcting the breakage to occur in a portion closer to the band-shaped breakable portion 30.

[0112] [Variations] Next, a modified example of the packaging box 1 of this embodiment will be described.

[0113] In this embodiment, an example has been described in which the product to be packaged is placed on the bottom plate 11 and then the packaging box 1 is assembled, but the present invention is not limited to this. After assembling the body 4, the box body with one of the closure parts 2 closed may be assembled, and then the product may be inserted.

[0114] In this embodiment, a rectangular tubular body 4 is shown, but this is not limited to this. The body 4 may also be a polygon having more than a square, such as an octagonal tubular shape (not shown), as long as it is possible to form break initiation portions 40a on a pair of long sides and the opposing sides can be broken up and down by the band-shaped breaking portion 30.

[0115] In this embodiment, an example has been shown and explained in which the side panel breakable lines 30a, 30b are formed by so-called perforations, but the present invention is not limited to this and any method capable of forming an easily breakable portion may be used. For example, so-called liner cuts in which discontinuous cuts are formed in the liner on one side of the cardboard (usually the back side) are also preferred.

[0116] In this embodiment, an example has been shown and described in which one break initiation portion 40a is broken, and then the band-shaped break portion 30 is broken up to the other end side to form the break opening 300. However, the present invention is not limited to this, and it is also possible to form the break opening 300 partway, and then break the other break initiation portion 40a, and break the band-shaped break portion 30 toward the already formed break opening 300.

[0117] In this embodiment, the width w1 between the side panel breakable lines 30a, 30b is described as w1 ≈ 5t relative to the thickness t of the corrugated cardboard 1X, but the present invention is not limited to this, and may be adjusted, for example, within the range of 3t ≦ w1 ≦ 10t depending on the thickness t of the corrugated cardboard.

[0118] In addition, in this embodiment, an example has been shown and described in which the break initiation portion 40a is connected to the strip-shaped break portion 30 by sandwiching the strip-shaped break portion 30 from the outside, but the present invention is not limited to this, and the width of the break initiation portion 40a and the strip-shaped break portion 30 may be freely set within a range that allows connection, and the widths may be the same.

[0119] In addition, in this embodiment, the closed fracture line 43 at the fracture initiation portion 40a is shown to be arc-shaped, but it is sufficient if a hole of a shape and size that allows a finger to be inserted is formed, and it may be U-shaped, or may be a deformed curve, a collection of multiple straight lines, or a broken line that resembles a part of a polygon that has been cut out.

[0120] In this embodiment, the width w2 between the second breakable lines 42 has been described as w2≈1.4w1, but the present invention is not limited to this, and may be adjusted within the range of, for example, 1.1w1≦w2≦2w1.

[0121] In this embodiment, an example is shown and described in which the second tip break line 52 is configured as an upwardly convex arc-shaped breakable line, but the present invention is not limited to this, and it may be a downwardly convex arc-shaped breakable line or a straight line.

[0122] In this embodiment, the width w3 of the narrow region of the first auxiliary breakable lines 60a, 60b is described as w3≈1.8w1, but the present invention is not limited to this and may be adjusted, for example, within the range of 1.4w1≦w3≦3w1.

[0123] In this embodiment, the width w4 of the wide region of the first auxiliary breakable lines 60a, 60b is described as w4≈2.1w1, but the present invention is not limited to this and may be adjusted, for example, within the range of 1.9w1≦w4≦4w1.

[0124] In this embodiment, the width w5 of the wide region of the second auxiliary breakable lines 60a, 60b is described as w5≈w4, and the width w6 of the narrow region is described as 6≈w3, but the respective dimensions may be set to be different from w4, w3.

[0125] In this embodiment, the radius r1 of the arc of the occluding break line 43 is described as r1 ≒ 1 / 2w3 with respect to the narrow width region w3 of the first auxiliary breakable lines 60a, 60b, but the present invention is not limited to this and may be adjusted, for example, in the range of 1 / 4w3≦r1≦1.0w3.

[0126] In this embodiment, the length L1 of the inner flap 22 in the height direction (vertical direction in Figure 2) of the break initiation portion 40a has been described as L1 ≈ 1.5w1, relative to the width w1 between the side panel breakable lines 30a, 30b. However, the present invention is not limited to this, and may be adjusted, for example, within the range of 1.0w1 ≦ L1 ≦ 2w1.

[0127] In this embodiment, an example has been described in which the tip breakable line 50 is formed biased downward, i.e., toward the bottom plate 5, from the vertical position where the middle portions of the tip edges of the lower outer flap 21 and the upper outer flap 23 are abutted against each other, but the present invention is not limited to this and the tip breakable line 50 may be biased upward.

[0128] In this embodiment, the radius r2 of the arc of the second tip break line 52 is described as r2 ≈ 2 / 3w1 with respect to the width w1 between the side panel breakable lines 30a, 30b. However, the present invention is not limited to this and may be adjusted, for example, within the range of 1 / 3w1≦r2≦1.2w1.

[0129] In this embodiment, the length L2 of the first auxiliary breakable lines 60a, 60b is described as L2 ≈ 2.2L1 relative to the length L1 of the break initiation portion 40a, but the present invention is not limited to this and may be adjusted, for example, within the range of 1.5L1≦L2≦3L1.

[0130] In this embodiment, the length of the space L3 between the first auxiliary breakable lines 60a, 60b and the second auxiliary breakable lines 70a, 70b is described as L3 ≒ L2, with respect to the length L2 of the first auxiliary breakable lines 60a, 60b. However, the present invention is not limited to this, and may be adjusted, for example, within the range of 1 / 2L2≦L3≦1.5L2.

[0131] In this embodiment, the length L4 of the second auxiliary breakable lines 70a, 70b is described as L4 ≒ 2L2 relative to the length L2 of the first auxiliary breakable lines 60a, 60b, but the present invention is not limited to this and may be adjusted, for example, in the range of 1.5L2≦L4≦2.5L2.

[0132] In this embodiment, the distance L5 between the second auxiliary breakable lines 70a, 70b on one end and the second auxiliary breakable lines 70a, 70b on the other end has been described as L5 ≒ 0.55L4, where L4 is the length of the second auxiliary breakable lines 70a, 70b. However, the present invention is not limited to this and may be adjusted, for example, in the range of 1 / 3L4≦L5≦1.5L4.

[0133] In this embodiment, the width w1 between the side panel breakable lines 30a, 30b, the width w2 between the second breakable lines 42, the width w3 of the narrow region of the first auxiliary breakable lines 60a, 60b, the width w4 of the wide region, the width w5 of the wide region of the second auxiliary breakable lines 70a, 70b, and the width w6 of the narrow region are described as multiples of width w1, but the present invention is not limited to this, and the above widths w1 to w6 can be set arbitrarily as necessary depending on differences in the size, plate thickness, weight, etc. of the box.

[0134] In this embodiment, the height direction length L1 of the inner flap 22 of the break initiation portion 40a, the length L2 of the first auxiliary breakable lines 60a, 60b, the distance L3 between the first auxiliary breakable lines 60a, 60b and the second auxiliary breakable lines 70a, 70b, the length L4 of the second auxiliary breakable lines 70a, 70b, and the distance L5 between the second auxiliary breakable lines 70a, 70b at one end and the second auxiliary breakable lines 70a, 70b at the other end are described as multiples of the width w1, either directly or indirectly, but the present invention is not limited to this, and the above lengths L1 to L5 can be set arbitrarily as necessary depending on differences in the size, plate thickness, weight, etc. of the box.

[0135] In this embodiment, the radius r1 of the arc of the occlusion break line 43 and the radius r2 of the arc of the second tip break line 52 are described as multiples of the width w1, either directly or indirectly, but the present invention is not limited to this, and the above radii r1 and r2 can be adjusted as necessary depending on differences in the size of each other's radii, the size of the box, etc.

[0136] In addition, in this embodiment, each breakable line is shown formed as a so-called perforation consisting of multiple intermittent linear cuts, but this is not limited to this. For example, although not shown, the line may be formed as a zipper consisting of multiple cuts with one end bent. [Explanation of symbols]

[0137] 1 packaging box 2 Occlusion 3 Side Panel 4. Torso 5 Bottom plate 6. Tabletop 21 Lower outer flap 22 Inner flap 23 Upper outer flap 30 Strip-shaped break 30a, 30b Side panel breakable line 40 Start breakable line 40a Fracture start 50 Breakable wire tip 52 Inclined portion (second tip break line) a Body fold line b Lower inner flap fold line c Lower outer flap fold line d Upper inner flap fold line e. Upper outer flap fold line

Claims

1. The container has a rectangular tubular body extending horizontally and a pair of closing portions that close the open ends of the body, The body portion has a pair of side plates facing each other, a bottom plate connecting lower edges of the pair of side plates, and a top plate connecting upper edges of the pair of side plates, the closing portion is connected to the side panels, and has a pair of inner flaps whose leading edges face each other; a pair of outer flaps which are connected to the top panel and the bottom panel, and have narrow convex leading sides, and the middle parts of the leading edges are butted against each other and overlapped with and bonded to the outside of the inner flaps; and a recess which is an area sandwiched between the ends of the leading edges facing each other of the pair of outer flaps and exposes the inner flaps to the outside, a band-shaped breakable portion provided on the side plate and sandwiched between a pair of side plate breakable lines extending along a vertical middle portion while connecting both side edges; A break initiation portion provided in the recess of the inner flap and connected to the band-shaped break portion; a tip breakable line provided in an area of ​​the inner flap where the inner flap overlaps with the pair of outer flaps, the tip breakable line passing through a gap between an adhesive portion between the outer flap connected to the top plate and an adhesive portion between the outer flap connected to the bottom plate and extending from the breakable start portion to a tip edge of the inner flap; A packaging box comprising:

2. The packaging box according to claim 1, The packaging box is characterized in that the tip breakable line is formed offset upward or downward from the vertical position where the middle portions of the tip edges of the pair of outer flaps are abutted against each other.

3. The packaging box according to claim 1 or 2, The packaging box according to claim 1, wherein the tip breakable line has an inclined portion inclined upward at its base end.

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