Packing box

Abstract

To provide a packing box of which the opening of a cylindrical body can be easily and swiftly closed.SOLUTION: A packing box 1 includes a pair of inner flaps 15 that close the top opening of its cylindrical body 10, and a pair of outer flaps 16, 17 that are stacked on the pair of inner flaps 15 while overlapping their leading ends. A pair of inner insertion portions 31 are formed on the pair of inner flaps 15, a pair of outer insertion portions 32 are formed on the first outer flap 16, and a pair of insertion pieces 33 are formed on the two corners of the leading end of the second outer flap 17. The inner flap 15, the first outer flap 16, and the second outer flap 17 are folded inward in this order, and after the insertion piece 33 is started to be inserted into the outer insertion portion 32 in a bent position relative to the second outer flap 17, and then is inserted into the outer insertion portion 32 and the inner insertion portion 31 while being straightened, the leading end side of the second outer flap 17 excluding the pair of insertion pieces 33 is overlapped on the leading end side of the first outer flap 16.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a packing box.

Background Art

[0002] There is known a cardboard box in which the top surface opening of a cylindrical body having a square tube shape is closed by a pair of inner lid flaps and a pair of outer lid flaps (Patent Document 1). The outer lid flap has a projecting piece protruding from the central portion in the width direction of the leading edge of the rectangular main body. A pair of engaging portions are formed at the leading ends on both sides in the width direction of the main body. In the inner lid flap, a first locking hole for inserting the engaging portion of one outer lid flap and a second locking hole for inserting the engaging portion of the other outer lid flap are opened. Further, in the outer lid flap, a pair of first mountain fold lines extending from both ends in the width direction of the base edge to the central portion of the leading edge of the projecting piece are formed, and in the inner lid flap, a pair of second mountain fold lines extending from both ends in the width direction of the base edge to the central portion of the leading edge of the inner lid flap are formed. By folding the inner lid flap along the pair of second mountain fold lines and folding the outer lid flap along the pair of first mountain fold lines while inserting the four engaging portions into the first to second locking holes of the pair of inner lid flaps, the top surface of the cylindrical body is formed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described technique, it is necessary to fold the inner lid flap along the pair of second mountain fold lines and fold the outer lid flap along the pair of first mountain fold lines while inserting the four locking portions into the pair of first locking holes and the pair of second locking holes, and there is a problem that it takes time and effort to close the top surface opening of the cylindrical body.

[0005] In view of the above circumstances, the present invention provides a packaging box that can easily and quickly close the opening of a cylindrical body.

Means for Solving the Problems

[0006] The packaging box of the present invention includes a cylindrical body formed by alternately arranging a pair of first side walls and a pair of second side walls, a pair of inner flaps connected to the pair of first side walls and bent inward to close at least a part of an opening formed in one axial direction of the cylindrical body, and a pair of outer flaps connected to the pair of second side walls and bent inward to be laminated on the pair of inner flaps while overlapping the tip sides of each other to close at least a part of the opening. A pair of inner insertion portions are formed on the pair of inner flaps, and a pair of outer insertion portions facing the pair of inner insertion portions are formed on a first outer flap which is one of the pair of outer flaps in a state where the first outer flap is laminated on the pair of inner flaps. A pair of insertion pieces are formed at both corner portions of the tip of a second outer flap which is the other of the pair of outer flaps. The pair of inner flaps, the first outer flap, and the second outer flap are bent inward in this order. The pair of insertion pieces start to be inserted into the pair of outer insertion portions in a posture bent with respect to the second outer flap, and then the insertion into the pair of outer insertion portions and the pair of inner insertion portions proceeds while stretching the bend, and the tip side of the second outer flap excluding the pair of insertion pieces is overlapped with the tip side of the first outer flap.

[0007] In this case, the outer insertion portion may be opened by pushing in an outer pushing piece inclined from near the corner portion of the tip of the first outer flap toward the center side of the first outer flap with one side on the tip side of the first outer flap as a fulcrum.

[0008] In this case, in a state where the first outer flap is laminated on the pair of inner flaps, the inner insertion portion may be opened by pushing in an inner pushing piece inclined from the base end side to the tip side of the inner flap toward the base end side of the first outer flap with one side on the tip side of the inner flap as a fulcrum.

[0009] In this case, it is preferable that the outer pushing piece is more difficult to push in than the inner pushing piece.

[0010] In this case, the pair of insertion pieces is defined by a pair of insertion folding lines that incline away from each other from the tip side to the base side of the second outer flap, and is in a posture bent along the pair of insertion folding lines. With the tip side of the second outer flap overlapped with the tip side of the first outer flap, it is preferable that the insertion folding line faces a position shifted to the tip side of the first outer flap from the one side that is the fulcrum when pushing in the outer pushing piece.

Advantages of the Invention

[0011] According to the present invention, the opening of the cylindrical body can be closed easily and quickly.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiment for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that Fr, Rr, L, R, U, and D shown in the drawings indicate front, rear, left, right, top, and bottom. The front-rear direction, the left-right direction, and the up-down direction are orthogonal to each other. In this specification, terms indicating directions and positions are used for convenience of explanation and do not limit the technical scope of the present invention. Also, the terms indicating directions and positions are generally based on the directions and positions when using the packing box.

[0014] Referring to FIGS. 1 and 2, the packing box 1 according to this embodiment will be described. FIG. 1 is a perspective view showing the packing box 1. FIG. 2 is a plan view showing the blank 1A of the packing box 1.

[0015] The packing box 1 is a so-called one-touch bottom-assembly type cardboard box in which the bottom surface of a cylindrical body 10 formed in a substantially square tube shape is bottom-assembled with one touch, and the top surface opening (opening formed in one axial direction) of the cylindrical body 10 is closed by a pair of inner flaps 15 and a pair of outer flaps 16, 17 (see FIG. 1). The packing box 1 is assembled from the blank 1A shown in FIG. 2. The blank 1A is formed by punching out a single paper cardboard sheet by die-cutting or the like. The cardboard sheet is, for example, a double-sided cardboard sheet in which liners are bonded to both the front and back surfaces of a corrugated middle core 9A. Note that FIGS. 2, 3, 7A, 7B, and 8 described later show the front side (outer surface side). In this specification, the direction parallel to the middle core 9A of the cardboard sheet will be referred to as the "corrugation direction", and the direction orthogonal to the corrugation direction will be referred to as the "flow direction". "X" shown in the drawings indicates the "corrugation direction", and "Y" indicates the "flow direction".

[0016] [Blank] As shown in Fig. 2, the blank 1A includes a pair of first side walls 11, a pair of second side walls 12, a pair of first bottom walls 13, a pair of second bottom walls 14, a pair of inner flaps 15, and a pair of outer flaps 16, 17. Since the pair of first side walls 11 are generally of the same shape, in this specification, unless otherwise specified, one of the first side walls 11 will be described. For the same reason, in this specification, unless otherwise specified, one of the second side walls 12, one of the first bottom walls 13, one of the second bottom walls 14, and one of the inner flaps 15 will be described.

[0017] <First side wall, second side wall> The pair of first side walls 11 and the pair of second side walls 12 are alternately arranged in the flow direction and are connected via a first bending line L1. The first side wall 11 and the second side wall 12 are formed in a substantially rectangular shape. The second side wall 12 is formed longer than the first side wall 11 in the flow direction. A substitute piece 18 is connected to the free end of the second side wall 12 arranged on one side in the flow direction via the first bending line L1.

[0018] <First bottom wall> The first bottom wall 13 is connected to one end (lower end) of the first side wall 11 in the step direction via a second bending line L2. The first bottom wall 13 is formed in a substantially trapezoidal shape that gradually narrows from the base end to the tip end. The dimension (extension dimension) of the first bottom wall 13 in the step direction is set to be approximately half of the dimension of the first side wall 11 in the flow direction.

[0019] <Second bottom wall> The second bottom wall 14 is connected to one end (lower end) of the second side wall 12 in the step direction via a second bending line L2. The second bottom wall 14 is generally formed in a rectangular shape, and the dimension (extension dimension) of the second bottom wall 14 in the step direction is set to be slightly longer than half of the dimension of the first side wall 11 in the flow direction. A meshing recess 20 is notched in a substantially trapezoidal shape at the middle part of the second bottom wall 14 in the flow direction and on the tip end side in the step direction. A bottom folding line L4 extends obliquely from the corner of the meshing recess 20 toward the base end side of the second bottom wall 14, and a bottom adhesive piece 21 is defined by the bottom folding line L4.

[0020] <Inner flap> The inner flap 15 is connected to the other end (upper end) in the step direction of the first side wall 11 via the third folding curve L3. The inner flap 15 is formed in a substantially rectangular shape, and the dimension (extension dimension) of the inner flap 15 in the step direction is set to approximately half of the dimension of the second side wall 12 in the flow direction. Note that the extension dimension of one inner flap 15 arranged between the pair of outer flaps 16 and 17 is set to be slightly shorter than the extension dimension of the other inner flap 15.

[0021] <Outer flap> The pair of outer flaps 16 and 17 are connected to the other ends (upper ends) in the step direction of the pair of second side walls 12 via the third folding curve L3. Each outer flap 16 and 17 is formed in a substantially rectangular shape, and the dimension (extension dimension) of each outer flap 16 and 17 in the step direction is longer than half of the dimension of the first side wall 11 in the flow direction. Although details will be described later, when the pair of outer flaps 16 and 17 are folded inward to close the top surface opening of the cylindrical body 10, the tip sides thereof are overlapped with each other. In this specification, for convenience of explanation, the outer flap 16 (one of the pair of outer flaps 16 and 17) on one side in the flow direction (the side where the succession piece 18 is provided) is referred to as the "first outer flap 16", and the outer flap 17 (the other of the pair of outer flaps 16 and 17) arranged between the pair of inner flaps 15 is referred to as the "second outer flap 17". In the description common to the first outer flap 16 and the second outer flap 17, they will simply be referred to as "outer flaps 16 and 17".

[0022] A substantially U-shaped opening cutting line 22 is formed in the middle part of the first outer flap 16 in the flow direction. The opening cutting line 22 is a so-called zipper that branches into two from the base end side in the step direction of the first outer flap 16 and extends to the tip. An opening start piece 23 is formed on the first outer flap 16 adjacent to the base end side in the step direction of the opening cutting line 22. The opening start piece 23 is connected to the first outer flap 16 via an opening folding line L5 substantially parallel to the third folding curve L3 and is partitioned by a perforation. Note that a perforation is formed in the middle part of the third folding curve L3 facing the opening folding line L5 with a gap therebetween.

[0023] On both sides in the flow direction and on the tip side in the step direction of the second outer flap 17, a pair of side recesses 24 are formed. The tip side of the second outer flap 17 in the step direction is formed to be narrower in the flow direction than the base end side in the step direction.

[0024] Note that the first to third folding lines L1 to L3 and the opening folding line L5 are, for example, general-purpose ruled lines formed by indenting the corrugated cardboard sheet from the back surface (inner surface). The bottom folding line L4 is, for example, a reverse ruled line formed by indenting the corrugated cardboard sheet from the front surface (outer surface). The general-purpose ruled line mainly has the function of bending (correctly folding) the corrugated cardboard sheet so that the back surface faces inward, and the reverse ruled line mainly has the function of bending (reverse folding) the corrugated cardboard sheet so that the front surface faces inward. Note that the first to third folding lines L1 to L3, the opening folding line L5, and the bottom folding line L4 are not limited to general-purpose ruled lines or reverse ruled lines, and may be any lines such as perforations or lead ruled lines with perforations on general-purpose ruled lines for folding the corrugated cardboard sheet in a desired direction.

[0025] [Lock Structure] A pair of inner flaps 15 and a pair of outer flaps 16, 17 are provided with a lock structure 30 for holding the state in which the top surface opening of the cylindrical body 10 is closed. With reference to FIGS. 2 and 3, the lock structure 30 will be described. FIG. 3 is a plan view showing a partially enlarged view of the blank 1A.

[0026] As shown in FIG. 2, the lock structure 30 has a pair of inner insertion portions 31, a pair of outer insertion portions 32, and a pair of insertion pieces 33. Note that the pair of inner insertion portions 31 are line-symmetrical about the second outer flap 17, the pair of outer insertion portions 32 are line-symmetrical about a line that bisects the first outer flap 16 in the flow direction, and the pair of insertion pieces 33 are line-symmetrical about a line that bisects the second outer flap 17 in the flow direction. Therefore, in this specification, unless otherwise specified, each part will be described.

[0027] [Inner Insertion Portion] As shown in Fig. 2, a pair of inner insertion parts 31 are formed on a pair of inner flaps 15. The inner insertion parts 31 are formed near the base end side in the step direction (near the third bending line L3) and near the center in the flow direction of the inner flaps 15. The inner insertion part 31 opens by pushing in an inner pushing piece 31A formed in a substantially elliptical shape (or a rectangle with rounded corners). The pair of inner pushing pieces 31A are inclined so as to approach each other from the tip side to the base end side in the step direction of the pair of inner flaps 15. As shown in Fig. 3, the inner pushing piece 31A is partitioned from the inner flap 15 by an inner cut line 31B formed in a substantially U shape, leaving one side on the tip side in the step direction of the inner flap 15 (one side directed toward the tip corner). An inner pushing line L6 (for example, a lead ruled line) is formed on the side that is left without being cut by the inner cut line 31B, and the inner pushing piece 31A is continuously provided to the inner flap 15 via the inner pushing line L6. Note that the inclination angle of the inner pushing piece 31A (inner pushing line L6) is, for example, 45 degrees with respect to the step direction (or the flow direction), but is not limited to this and may be appropriately changed.

[0028] <Outer insertion part> As shown in Fig. 3, a pair of outer insertion parts 32 are formed on the first outer flap 16. The outer insertion parts 32 are formed on the tip side in the step direction and both sides in the flow direction (both outer sides of the unsealing cut line 22) of the first outer flap 16. The outer insertion part 32 opens by pushing in an outer pushing piece 32A formed in a substantially elliptical shape (or a rectangle with rounded corners). The pair of outer pushing pieces 32A are inclined so as to approach each other from near the corner at the tip in the step direction of the first outer flap 16 to the base end side. The outer pushing piece 32A is partitioned from the first outer flap 16 by an outer cut line 32B formed in a substantially U shape, leaving one side on the tip side in the step direction of the first outer flap 16 (one side directed toward the unsealing cut line 22). An outer pushing line L7 (for example, a general ruled line) is formed on the side that is left without being cut by the outer cut line 32B, and each outer pushing piece 32A is continuously provided to the first outer flap 16 via the outer pushing line L7. Note that the inclination angle of the outer pushing piece 32A (outer pushing line L7) is, for example, 45 degrees with respect to the step direction (or the flow direction), but is not limited to this and may be appropriately changed.

[0029] Each external insertion part 32 (external insertion piece 32A) is formed to be slightly smaller than each internal insertion part 31 (internal insertion piece 31A). The extension dimension W2 of the external insertion piece 32A from the external insertion line L7 is shorter than the extension dimension W1 of the internal insertion piece 31A from the internal insertion line L6. Also, since the internal insertion line L6, which is a lead ruling line, is weaker than the external insertion line L7, which is a general-purpose ruling line, the force for bending the external insertion piece 32A along the external insertion line L7 is greater than the force for bending the internal insertion piece 31A along the internal insertion line L6. From the above, the external insertion piece 32A is more difficult to push in (more difficult to bend) than the internal insertion piece 31A. In other words, the restoring force (repulsive force) around the external insertion line L7 is greater (stronger) than the restoring force (repulsive force) around the internal insertion line L6.

[0030] <Insertion piece> As shown in FIG. 2, a pair of insertion pieces 33 are formed at both corner portions of the tip in the step direction of the second outer flap 17. The pair of insertion pieces 33 are partitioned on the second outer flap 17 by a pair of insertion folding lines L8 that incline away from each other from the tip side to the base end side in the step direction of the second outer flap 17. The insertion folding line L8 is, for example, a lead ruling line, and partitions the insertion piece 33 having a substantially triangular shape within the range of the corner portion at the tip of the second outer flap 17 and the side recess 24. Exactly, the corner portion of the insertion piece 33 is chamfered to form an inclined straight line shape, and the insertion piece 33 is formed in a substantially trapezoidal shape. Note that the inclination angle of the insertion folding line L8 is, for example, 45 degrees with respect to the step direction (or flow direction), but is not limited to this and may be appropriately changed.

[0031] Note that the external insertion line L7 is a general-purpose ruling line, and the internal insertion line L6 and the insertion folding line L8 are lead ruling lines, but it is not limited to this, and any line can be used as long as it is a line for bending the cardboard sheet in a desired direction.

[0032] [Assembly of packaging box] Next, with reference to FIGS. 1, 4 to 6, an example of the assembly work (sealing work) of the packaging box 1 will be briefly described. FIG. 4 is a perspective view showing a state in which the inner flap 15 and the first outer flap 16 are bent inward. FIG. 5 is a perspective view showing a process of inserting the insertion piece 33 into each of the insertion portions 31 and 32 while bending the second outer flap 17 inward. FIG. 6(A) is a plan view showing the packaging box 1, and FIG. 6(B) is a cross-sectional view taken along line B-B of (A).

[0033] Note that, as an initial state of the packaging box 1, it is assumed that the packaging box 1 is double-folded (not shown). Specifically, the first bottom wall 13 and the second bottom wall 14 are folded back inward (right-folded) along the second folding line L2, the bottom adhesive piece 21 is reverse-folded along the bottom folding line L4, and the first side wall 11 and the second side wall 12 located on both sides in the flow direction of the blank 1A are folded back inward (right-folded) along the first folding line L1. Then, the back surface of the bottom adhesive piece 21 is adhered to the front surface of the first bottom wall 13, and the surface of the generation piece 18 is adhered to the back surface of the first side wall 11. As a result, the cylindrical body 10 (packaging box 1) is in an initial state of being double-folded while sandwiching a pair of first bottom walls 13 and a pair of second bottom walls 14.

[0034] The operator raises the folded packaging box 1 and alternately arranges a pair of first side walls 11 and a pair of second side walls 12 to form a cylindrical body 10 having a substantially rectangular tube shape (see FIG. 4). By deforming the cylindrical body 10 into a rectangular tube shape, a pair of first bottom walls 13 and a pair of second bottom walls 14 folded back inward are pushed downward while stretching the bottom adhesive piece 21 that has been reverse-folded, and the engagement recesses 20 of the pair of second bottom walls 14 engage with each other. Thus, the bottom surface of the packaging box 1 (cylindrical body 10) is formed (bottom-assembled (not shown)).

[0035] The operator accommodates a product (not shown) inside the cylindrical body 10 (places it on the bottom surface) through the top surface opening of the cylindrical body 10. The operator bends a pair of inner flaps 15, the first outer flap 16, and the second outer flap 17 inward (right-fold) along the third folding line L3 in this order, and seals the packaging box 1.

[0036] As shown in FIG. 4, a pair of inner flaps 15 are bent inwardly so as to generally abut their tips against each other. Exactly speaking, the tips of the pair of inner flaps 15 are slightly separated from each other, but since the gap between their tips is slight, the pair of inner flaps 15 will close substantially the entire top surface opening of the cylindrical body 10.

[0037] Next, a pair of outer flaps 16, 17 are bent inwardly and will be laminated on the pair of inner flaps 15 that have closed the top surface opening while overlapping each other at the tip side (a part thereof). Specifically, as shown in FIG. 4, the first outer flap 16 is bent inwardly and laminated on the pair of inner flaps 15 that have closed the top surface opening. In a state where the first outer flap 16 is laminated on the pair of inner flaps 15, a pair of outer insertion portions 32 formed on the first outer flap 16 face a pair of inner insertion portions 31 (see also FIG. 6(A)). Since the inner insertion portion 31 is slightly larger than the outer insertion portion 32, the outer insertion portion 32 is within the formation range of the inner insertion portion 31 when viewed from the plane. The inner pushing line L6 of the inner insertion portion 31 and the outer pushing line L7 of the outer insertion portion 32 are directed toward the second outer flap 17 (rearward). Note that since the middle portion of the third bending line L3 formed at the boundary between the first outer flap 16 and the second side wall 12 is weakened by a perforation, unintentionally bending the first outer flap 16 along the unsealing cutting line 22 or the unsealing folding line L5 is suppressed, and the first outer flap 16 can be bent substantially surely along the third bending line L3.

[0038] Next, a pair of insertion pieces 33 are folded forward along the insertion folding line L8, and the second outer flap 17 is bent (folded forward) inward. As shown in FIG. 5, as the folding of the second outer flap 17 progresses, the tip portions (chamfered portions) of the pair of insertion pieces 33 abut against the pair of outer pushing pieces 32A, and push the pair of outer pushing pieces 32A in. The outer pushing pieces 32A are bent inward (downward) along the outer pushing line L7 to open the outer insertion portion 32 (see FIG. 6(B)). The insertion pieces 33 start to be inserted into the outer insertion portion 32 while pushing the outer pushing pieces 32A to open the outer insertion portion 32 in a posture bent (with respect to the second outer flap 17) along the insertion folding line L8. The inner pushing piece 31A is bent inward (downward) along the inner pushing line L6 to open the inner insertion portion 31 by being pushed by the outer pushing piece 32A (or the insertion piece 33) (see FIG. 6(B)). After the insertion pieces 33 start to be inserted into the outer insertion portion 32, while extending the bending at the insertion folding line L8, the insertion pieces 33 push the inner pushing piece 31A to open the inner insertion portion 31 and proceed with the insertion into the outer insertion portion 32 and the inner insertion portion 31.

[0039] When the insertion into each of the insertion portions 31 and 32 is completed, the insertion pieces 33 penetrate through the first outer flap 16 and the inner flap 15 in a posture slightly bent and inclined with respect to the second outer flap 17, and position their tip portions inside the cylindrical body 10 (see FIG. 6(B)). As shown in FIG. 6, the entire insertion pieces 33 are not inserted into the outer insertion portion 32 etc., and the insertion folding line L8 is located upstream (rearward) in the insertion direction of the insertion pieces 33 from the outer pushing line L7. That is, in a state where the tip side of the second outer flap 17 is overlapped with the tip side of the first outer flap 16, the insertion folding line L8 faces a position shifted toward the tip side of the first outer flap 16 from the outer pushing line L7 (one side which is a fulcrum when pushing the outer pushing piece 32A) (when viewed from the plane (or cross section)). The insertion pieces 33 are slightly lifted from the first outer flap 16 due to the fold at the insertion folding line L8 (see FIG. 6(B)).

[0040] On the one hand, as shown in FIGS. 1 and 6(A), the tip side of the second outer flap 17 excluding the pair of insertion pieces 33 is overlapped with the tip side (surface) of the first outer flap 16. The tip side and the intermediate region in the left-right direction of the second outer flap 17 are covered by the tip side and the intermediate region in the left-right direction (a part of the formation range of the unsealing cutting line 22) of the first outer flap 16.

[0041] The insertion pieces 33 inserted into the respective insertion portions 31, 32 attempt to straighten the bending at the insertion folding line L8 by the restoring force (repulsive force) around the insertion folding line L8. That is, the insertion pieces 33 attempt to return to a posture parallel to the second outer flap 17. The insertion pieces 33 receiving the restoring force lift the inner flap 15, press the inner flap 15 (surface) against the back surface of the first outer flap 16, and press the surface of the first outer flap 16 against the back surface of the second outer flap 17 (see FIG. 6(B)). The insertion pieces 33 are slightly bent with respect to the second outer flap 17 due to the crease at the insertion folding line L8, but are in an inclined posture such that they can be regarded as being generally parallel to the second outer flap 17 (see FIG. 6(B)).

[0042] Also, the outer pushing piece 32A attempts to straighten the bending at the outer pushing line L7 by the restoring force (repulsive force) around the outer pushing line L7. The inner pushing piece 31A attempts to straighten the bending at the inner pushing line L6 by the restoring force (repulsive force) around the inner pushing line L6. That is, the outer pushing piece 32A attempts to return to a posture parallel to the first outer flap 16, and the inner pushing piece 31A attempts to return to a posture parallel to the inner flap 15. The outer pushing piece 32A and the inner pushing piece 31A receiving the restoring force lift the insertion piece 33, press the insertion piece 33 against the inner flap 15, press the inner flap 15 (surface) against the back surface of the first outer flap 16, and press the surface of the first outer flap 16 against the back surface of the second outer flap 17 (see FIG. 6(B)). Also, the insertion piece 33 is sandwiched between the outer pushing piece 32A (or the inner insertion portion 31) and the hole edge portion of the inner insertion portion 31 (see FIG. 6(B)).

[0043] Furthermore, since the tip side of the second outer flap 17 presses against the tip side of the first outer flap 16, it receives the inner flap 15 and the first outer flap 16 that are lifted by the restoring force acting on the insertion piece 33, the outer insertion piece 32A, and the inner insertion piece 31A. In other words, the pair of insertion pieces 33 and the tip side of the second outer flap 17 sandwich the pair of inner flaps 15 and the first outer flap 16. The inner flap 15, the first outer flap 16, and the second outer flap 17 are laminated in a state of being substantially in close contact with each other.

[0044] As described above, as shown in FIG. 1, the top surface opening of the cylindrical body 10 is closed, and the top surface of the packaging box 1 (cylindrical body 10) is formed. Finally, the operator attaches the delivery slip 90 so as to straddle the pair of outer flaps 16, 17. Thereby, the packaging box 1 is sealed. Note that the delivery slip 90 may be attached so as to cover at least a part of the pair of insertion pieces 33 (pair of outer insertion portions 32) and not cover the unsealing start piece 23. When opening the sealed packaging box 1, the user may insert a finger into the hole formed by pushing in the unsealing start piece 23 of the first outer flap 16 and pull up the portion surrounded by the unsealing cut line 22 upward (not shown).

[0045] According to the packaging box 1 according to the present embodiment described above, by simply bending the pair of inner flaps 15, the first outer flap 16, and the second outer flap 17 inward in this order and inserting the pair of insertion pieces 33 into the pair of outer insertion portions 32 and the pair of inner insertion portions 31, the top surface opening of the cylindrical body 10 can be easily and quickly closed. Further, according to the packaging box 1 according to the present embodiment, since the insertion piece 33 is inserted into each of the insertion portions 31, 32 while stretching the bending, it is possible to make it difficult for the insertion piece 33 to interfere with the product housed inside the cylindrical body 10. Thereby, damage to the product can be suppressed.

[0046] Furthermore, according to the packaging box 1 according to the present embodiment, the inserted pieces 33 inserted into the insertion portions 31 and 32 are bent and stretched by the restoring force around the insertion fold line L8, so that the inner flap 15 can be pressed against the first outer flap 16, and the first outer flap 16 can be pressed against the second outer flap 17 (see Fig. 6(B)). In addition, by the tip side of the second outer flap 17 pressing down on the tip side of the first outer flap 16, the inner flap 15 and the first outer flap 16 lifted by the restoring force can be received. As a result, since the inner flap 15, the first outer flap 16, and the second outer flap 17 are laminated in a substantially close contact state, the top surface formed by closing the top surface opening of the cylindrical body 10 can be made substantially flat. As a result, even if the delivery slip 90 is attached so as to straddle the pair of outer flaps 16 and 17, a wide adhesive area of the delivery slip 90 can be ensured, and the delivery slip 90 can be made difficult to peel off.

[0047] Also, in the packaging box 1 according to the present embodiment, the outer insertion portion 32 is configured to open by pushing in an outer pushing piece 32A inclined from the vicinity of the corner at the tip of the first outer flap 16 toward the center side of the first outer flap 16 with the outer pushing line L7, which is one side at the tip side of the first outer flap 16, as a fulcrum. Further, in a state where the first outer flap 16 is laminated on the pair of inner flaps 15, the inner insertion portion 31 is configured to open by pushing in an inner pushing piece 31A inclined from the base end side to the tip side of the inner flap 15 toward the base end side of the first outer flap 16 with the inner pushing line L6, which is one side at the tip side of the inner flap 15, as a fulcrum. Since the inserted piece 33 is inserted into the insertion portions 31 and 32 while pushing in the respective pushing pieces 31A and 32A, a restoring force around the respective pushing lines L6 and L7 acts on the respective pushing pieces 31A and 32A. According to this configuration, the inserted piece 33 can be sandwiched between each of the pushing pieces 31A and 32A and the hole edge portion of each of the insertion portions 31 and 32, and it is possible to make it difficult to pull out the inserted piece 33 from each of the insertion portions 31 and 32. Thereby, the pair of outer flaps 16 and 17 can be held in a locked state. Further, the inserted piece 33 can be placed in a posture substantially parallel to the second outer flap 17, and the adhesion force between the inner flap 15, the first outer flap 16, and the second outer flap 17 can be improved.

[0048] Further, in the packaging box 1 according to the present embodiment, by weakening the inner pushing line L6 or shortening the outer pushing piece 32A (extension dimension W2), the outer pushing piece 32A is made more difficult to push in than the inner pushing piece 31A. According to this configuration, since the restoring force around the outer pushing line L7 of the outer pushing piece 32A can be strengthened, the outer pushing piece 32A can firmly sandwich the insertion piece 33 between itself and the hole edge of the outer insertion portion 32.

[0049] Further, in the packaging box 1 according to the present embodiment, the insertion folding line L8 of the insertion piece 33 faced a position shifted to the tip side of the first outer flap 16 from the outer pushing line L7 of the outer pushing piece 32A (see FIG. 6). As shown in FIG. 6(B), the insertion piece 33 slightly lifted from the first outer flap 16 due to the fold at the insertion folding line L8, and with the contact portion near the outer pushing line L7 as the fulcrum, the vicinity of the insertion folding line L8 as the effort point, and the tip portion inserted into the outer insertion portion 32 and the inner insertion portion 31 as the action point, it became like a lever. For example, when a delivery slip 90 is attached to the range including the vicinity of the insertion folding line L8 (effort point) and held in a state where the lifted vicinity of the insertion folding line L8 (effort point) is pressed against the first outer flap 16 (see the white arrow in FIG. 6(B)), the insertion piece 33 rotates around the contact portion (fulcrum) with the outer pushing line L7 so as to press the tip portion (action point) against the back surface of the inner flap 15 (see the thick arrow in FIG. 6(B)). As a result, the insertion piece 33 further strongly pushes up the inner flap 15 and the like, and the inner flap 15, the first outer flap 16, and the second outer flap 17 can be laminated in a more closely adhered state. Also, the insertion piece 33 becomes in a posture substantially parallel to the second outer flap 17, suppressing the interference of the insertion piece 33 with the product and regulating the pulling out of the insertion piece 33.

[0050] In the packaging box 1 according to the present embodiment, each outer insertion portion 32 (outer pushing piece 32A) is formed to be slightly smaller than each inner insertion portion 31 (inner pushing piece 31A). However, the present invention is not limited to this. The outer insertion portions 32 (outer pushing pieces 32A) and the inner insertion portions 31 (inner pushing pieces 31A) may be formed to have substantially the same size (not shown). Also, the inner pushing line L6 (lead grid line) is weakened more than the outer pushing line L7 (general-purpose grid line), and the force for bending the outer pushing piece 32A along the outer pushing line L7 is made greater than the force for bending the inner pushing piece 31A along the inner pushing line L6. However, the present invention is not limited to this. The inner pushing line L6 and the outer pushing line L7 may be the same weakening line, and the forces for bending the outer pushing piece 32A and the inner pushing piece 31A may be made substantially the same (not shown). That is, the inner pushing piece 31A and the outer pushing piece 32A may have substantially the same ease of pushing in, and the restoring force around the inner pushing line L6 and the restoring force around the outer pushing line L7 may be made substantially the same.

[0051] [Modification Example] In the packaging box 1 (blank 1A) according to the present embodiment, the outer insertion portion 32 is opened by bending the outer pushing piece 32A along the outer pushing line L7. However, the present invention is not limited to this. As shown in FIG. 7(A), as the packaging box 2 (blank 2A) according to the first modification example, the outer pushing line L7 may be omitted, and the outer pushing piece 35A may be defined only by the outer cut line 35B. In this case, the outer insertion portion 35 is opened by bending the outer pushing piece 35A inward along a side (virtual line) connecting both ends of the outer cut line 35B. Also, the insertion folding line L8 of the insertion piece 33 may face a position shifted to the tip side of the first outer flap 16 from the virtual line (not shown).

[0052] Also, as shown in FIG. 7(B), as the packaging box 3 (blank 3A) according to the second modification example, the outer insertion portion 36 may have one straight main cut line 361 and one straight sub cut line 362. The main cut line 361 is inclined at an angle of approximately 45 degrees with respect to the step direction (or the flow direction). The sub cut line 362 is orthogonal to the main cut line 361 and extends from approximately the center in the longitudinal direction of the main cut line 361 toward the tip in the step direction of the first outer flap 16. That is, the main cut line 361 and the sub cut line 362 form a substantially T shape. The sub cut line 362 is formed to be sufficiently shorter than the main cut line 361. Also, the insertion broken line L8 of the insertion piece 33 may face a position shifted to the tip side of the first outer flap 16 from the tip of the sub cut line 362 (not shown).

[0053] Further, in the packaging boxes 1 to 3 (blanks 1A to 3A) according to the present embodiment (including the first to second modification examples), the first outer flap 16 is formed to have a length that covers the entire inner insertion portion 31 of the pair of inner flaps 15, and the outer insertion portions 32, 35, 36 are open on the base end side rather than the tip side of the first outer flap 16, but the present invention is not limited to this. For example, as shown in FIGS. 8 and 9, as the packaging box 4 (blank 4A) according to the third modification example, the overlap on the tip side of the pair of outer flaps 16, 17 is reduced (shortened), and the first outer flap 16 is formed to have a length that covers approximately half of the pair of inner insertion portions 31, and the outer cut line 37B (outer pushing piece 37A) may reach the tip in the step direction of the first outer flap 16. In FIGS. 8 and 9, similar to the first modification example, the outer pushing line L7 is omitted, and the outer pushing piece 37A is defined only by the outer cut line 37B. The outer pushing piece 37A (outer cut line 37B) has a shape obtained by making the outer pushing piece 35A (outer cut line 35B) of the first modification example approximately half. By bending the outer pushing piece 37A inward, an outer insertion portion 37 that is recessed from the tip toward the base end of the first outer flap 16 is opened. Although the outer pushing line L7 is omitted in FIGS. 8 and 9, the present invention is not limited to this, and the outer pushing line L7 may be formed (not shown).

[0054] Note that in the packaging boxes 1 to 4 according to the present embodiment (including the first to third modified examples; the same applies hereinafter), the inner insertion portion 31 was opened by bending the inner pushing piece 31A along the inner pushing line L6. However, the present invention is not limited to this. For example, in the same spirit as the outer insertion portion 35 of the first modified example, the inner pushing line L6 may be omitted, and the inner pushing piece may be defined only by the score line (not shown). Further, for example, in the same spirit as the outer insertion portion 36 of the second modified example, the inner insertion portion may be constituted by the main score line and the sub-score line (not shown). Further, the inner pushing piece 31A and the inner pushing line L6 may be omitted, and the inner insertion portion may be formed as a simple hole (not shown).

[0055] In the packaging boxes 1 to 4 according to the present embodiment, the pair of inner flaps 15 generally abutted their tips against each other to close substantially the entire top surface opening of the cylindrical body 10. However, the present invention is not limited to this. For example, the tips of the pair of inner flaps 15 may be separated from each other, and it is sufficient that the pair of inner flaps 15 can close at least a part of the top surface opening of the cylindrical body 10.

[0056] In the packaging boxes 1 to 4 according to the present embodiment, the insertion piece 33 was defined in the second outer flap 17 by the insertion folding line L8. However, the present invention is not limited to this. For example, the insertion folding line L8 may be omitted, and the insertion piece 33 may be provided near the corner at the tip of the second outer flap 17 and may be bent using the flexibility of the material (not shown). Further, although the insertion folding line L8 of the insertion piece 33 was shifted to the tip side of the first outer flap 16 from the outer pushing line L7 of the outer pushing piece 32A, the present invention is not limited to this, and the insertion folding line L8 may substantially coincide with the outer pushing line L7 (not shown).

[0057] In the packaging boxes 1 to 4 according to the present embodiment, the tips of the second outer flap 17 including the pair of insertion pieces 33 were formed in a straight line. However, the present invention is not limited to this. For example, the tip side of the second outer flap 17 excluding the pair of insertion pieces 33 may protrude beyond the tips of the pair of insertion pieces 33, or the tip side of the pair of insertion pieces 33 may be recessed from the tips of the second outer flap 17 excluding the pair of insertion pieces 33 (both are not shown).

[0058] In addition, in the packaging boxes 1 to 4 according to the present embodiment, the opening cutting line 22, the opening start piece 23, etc. were formed on the first outer flap 16, but these may be omitted (not shown). Further, although the delivery slip 90 was attached to fix the pair of outer flaps 16 and 17, the present invention is not limited to this, and instead of the delivery slip 90, the pair of outer flaps 16 and 17 may be fixed with an adhesive tape (not shown). Further, although the delivery slip 90 was attached so as to cover at least a part of the pair of insertion pieces 33 (the pair of outer insertion portions 32), the present invention is not limited to this, and it may be attached so as to cover all of the pair of insertion pieces 33 (the pair of outer insertion portions 32) (not shown). Further, the force pressing the raised insertion folding line L8 (the force point) of the second outer flap 17 against the first outer flap 16 is weakened, but it may be attached to the pair of outer flaps 16 and 17 excluding the pair of insertion pieces 33 (not shown).

[0059] In addition, in the packaging boxes 1 to 4 according to the present embodiment, the lock structure 30 was applied to the top surface of the cylindrical body 10, but the present invention is not limited to this, and it may be applied to the bottom surface of the cylindrical body 10 (not shown). That is, the pair of inner flaps 15 and the pair of outer flaps 16 and 17 may be configured to close the bottom opening of the cylindrical body 10 (not shown).

[0060] In addition, the packaging boxes 1 to 4 according to the present embodiment were so-called one-touch bottom-assembled cardboard boxes, but the present invention is not limited to this. For example, the bottom surface of the packaging boxes 1 to 4 (the cylindrical body 10) may be formed by sequentially folding and overlapping a pair of inner flaps and a pair of outer flaps and fixing them with an adhesive tape (not shown).

[0061] In addition, the packaging boxes 1 to 4 according to the present embodiment were formed of a double-sided cardboard sheet made of paper, but the present invention is not limited to this, and they may be formed of a single-sided cardboard sheet, a double-sided cardboard sheet, cardboard, or a resin plate (sheet), etc.

[0062] Note that the description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The present invention may be variously changed, substituted, and modified without departing from the gist of the technical idea, and the claims include all embodiments that can be included within the scope of the technical idea.

Explanation of Reference Numerals

[0063] 1, 2, 3, 4 Packaging box 10 Cylindrical body 11 First side wall 12 Second side wall 15 Inner flap 16 First outer flap (outer flap) 17 Second outer flap (outer flap) 31 Inner insertion part 31A Inner pushing piece 32, 35, 36, 37 Outer insertion part 32A, 35A, 37A Outer pushing piece 33 Insertion piece L6 Inner pushing line (one side of the inner pushing piece) L7 Outer pushing line (one side of the outer pushing piece) L8 Insertion folding line

Claims

1. A cylindrical body (10) formed by alternately arranging a pair of first side walls (11) and a pair of second side walls (12) in a cylindrical shape, A pair of inner flaps (15) connected to the pair of the first side walls and bent inward to close at least a part of an opening formed in one axial direction of the cylindrical body, A pair of outer flaps (16, 17) connected to the pair of the second side walls, bent inward, and laminated on the pair of the inner flaps while overlapping the tip sides of each other to close at least a part of the opening, A pair of inner insertion portions (31) are formed on the pair of the inner flaps, On a first outer flap (16) which is one of the pair of the outer flaps, a pair of outer insertion portions (32, 35, 36, 37) facing the pair of the inner insertion portions in a state where the first outer flap is laminated on the pair of the inner flaps are formed, A pair of insertion pieces (33) are formed at both corner portions of the tip of a second outer flap (17) which is the other of the pair of the outer flaps, The pair of the inner flaps, the first outer flap, and the second outer flap are bent inward in this order. After the pair of the insertion pieces start to be inserted into the pair of the outer insertion portions in a posture bent with respect to the second outer flap, the pair of the insertion pieces are inserted into the pair of the outer insertion portions and the pair of the inner insertion portions while stretching the bend. The tip side of the second outer flap excluding the pair of the insertion pieces is overlapped with the tip side of the first outer flap. The packaging box is characterized by this.

2. The outer insertion portion (32) is opened by pushing in an outer pushing piece (32A) inclined from near the corner portion of the tip of the first outer flap toward the center side of the first outer flap with one side on the tip side of the first outer flap as a fulcrum. The packaging box according to Claim 1 is characterized by this.

3. In a state where the first outer flap is laminated on the pair of inner flaps, the inner insertion portion (31) opens by pushing in an inner pushing piece (31A) inclined toward the base end side of the first outer flap from the base end side to the tip end side of the inner flap with one side at the tip end side of the inner flap as a fulcrum. The packaging box according to claim 2, characterized in that.

4. The outer pushing piece (32) is more difficult to push in than the inner pushing piece (31). The packaging box according to claim 3, characterized in that.

5. The pair of insertion pieces are partitioned by a pair of insertion folding lines (L8) that incline away from each other from the tip end side to the base end side of the second outer flap, and are in a posture bent along the pair of insertion folding lines. In a state where the tip end side of the second outer flap is overlapped with the tip end side of the first outer flap, the insertion folding line faces a position shifted to the tip end side of the first outer flap from the one side that is the fulcrum when pushing in the outer pushing piece. The packaging box according to any one of claims 2 to 4, characterized in that.

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