JPWO2018198750A1 - Packaging box - Google Patents

Abstract

An object of the present invention is to provide a packaging box which maintains a state in which a side wall body sandwiches an extension. A stacking tray (1) (packaging box) capable of stacking a plurality of stacks vertically includes a bottom wall (10) including an engagement recess formed in a concave state on the surface, and a bottom wall (10). An end wall body (11) arranged in an upright posture on a peripheral edge portion, and a side wall body (12) arranged in an upright posture on a peripheral portion of a bottom wall body (10) at a position adjacent to the end wall body (11). The end wall (11) includes a support wall (35) provided to protrude inward and an extension provided to extend toward the side wall (12), The side wall body (12) is provided with an outer plate part (20) provided to extend upward from the peripheral edge of the bottom wall body (10), and is folded back down so as to cover the upper part of the extension part. 20) and an inner plate (22) sandwiching the extension between the inner plate (22) and the end of the inner plate (22). Engaging portion engaged with the engagement recess in a posture along the wall (10) and (23), it includes a.

Description

  The present invention relates to a packaging box.

  2. Description of the Related Art A packaging box that accommodates contents and is capable of stacking a plurality of packages vertically is known.

  For example, a packaging box described in Patent Literature 1 has a rectangular bottom wall, a pair of end walls provided on a short side of the bottom wall in an upright posture, and a pair of side walls provided on a long side of the bottom wall in an upright posture. And An inner wall is fixed to an inner surface of the end wall, and insertion locking portions are provided at lower portions on both sides of the end wall and the inner wall. When the packaging box is assembled, the inner wall is provided with a reinforcing wall constituting a support having a triangular cross section. The side wall is formed in a double wall structure by the outer plate portion and the inner plate portion, and the insertion locking portion is sandwiched and fixed between the outer plate portion and the inner plate portion. At the tip of the inner plate portion, a locking projection is formed which is locked in a locking hole opened in the bottom wall.

Japanese Patent No. 5782577

  For example, when a plurality of packaging boxes containing heavy goods and the like are stacked, a force may be applied to the lower packaging box receiving a load such that the end wall is tilted outward. When the end wall is tilted outward, the tip of the insertion locking portion inserted into the side wall rotates upward, so that the side wall may be lifted and the locking protrusion may be detached from the locking hole. . For this reason, the side wall of the lower packaging box is unfolded (disassembled), and it may not be possible to maintain a state in which the insertion locking portion is sandwiched.

  The present invention, in order to solve the above-mentioned problems, provides a packaging box in which a side wall body keeps a state in which an extension is sandwiched.

  In order to achieve the above-mentioned object, the present invention is a packaging box capable of stacking a plurality of layers vertically, a bottom wall including an engagement recess formed in a concave state on the surface, and a peripheral edge of the bottom wall. An end wall body arranged in the upright posture, and a side wall body arranged in an upright posture at a peripheral edge of the bottom wall body at a position adjacent to the end wall body shifted in the circumferential direction. Wherein the end wall includes a support wall provided in a state protruding inward, and an extension provided in a state extending toward the side wall, wherein the side wall is the bottom wall An outer plate portion provided in a state extending upward from a peripheral edge of the outer plate portion, and the extension portion is folded downward so as to cover an upper portion of the extension portion with respect to the outer plate portion, and the extension portion is provided between the outer plate portion and the outer plate portion. The inner plate portion to be sandwiched and the end portion of the inner plate portion are provided so as to be continuous with each other, and the outer plate portion and the inner plate portion In a state in which sandwich the extension includes a engaging portion for engaging the engagement recess in a posture along the bottom wall.

  In this case, an engagement piece portion that engages with an engagement groove formed in the end wall body in a state where the engagement protrusion is engaged with the engagement recess is provided at a side end of the inner plate portion. Is preferably formed.

  In this case, the packaging box is formed of a corrugated cardboard sheet in which a liner is attached to a middle lining, and the bottom wall is formed of a lower bottom wall connected to the outer plate portion and the lower bottom wall. An upper bottom wall formed separately from the bottom wall and arranged above the lower bottom wall and having a defective portion forming the engagement concave portion; and an inner bottom of the lower bottom wall. It is preferable that the center shin of the upper bottom wall extends in a direction crossing each other.

  In this case, the bottom wall further includes an intermediate bottom wall formed so as to be continuous with the end wall, and the intermediate bottom wall is formed separately from the lower bottom wall and the upper bottom wall. It is preferable that the fixing member is fixed while being sandwiched between the lower bottom wall and the upper bottom wall.

  In this case, the packaging box is formed of a corrugated cardboard sheet in which a liner is bonded to a middle lining, and the middle lining of each of the end wall, the outer plate portion, and the inner plate portion extends in a vertical direction. Is preferred.

  In this case, it is preferable that an upper end face of the support wall is provided below an uppermost end face of the end wall body, and the end wall body is formed so as to gradually become wider from below to above. .

  In this case, the end wall body includes an outer end wall arranged in a standing posture at a peripheral edge of the bottom wall body, and an outer edge provided to extend from a side end of the outer end wall toward the side wall body. A wall, an inner end wall overlapped on an inner surface of the outer end wall, and an inner edge wall overlapped on an inner surface of the outer edge wall, wherein the extension is at least one of the outer edge wall and the inner edge wall. The support wall is provided in a state of being connected to the inner end wall through a first fold curve, and the support wall is provided in a state of being connected to the inner edge wall through a second fold curve. And a third fold curve extending in parallel with the first fold curve and the second fold curve between the first fold curve and the second fold curve, wherein the support wall includes the inner edge wall as the second fold curve. By making the valley bend at the two-fold curve, the valley is broken at the first fold curve, and the third fold curve is formed inside. It is preferable to form a pillar having a rectangular cross-section and broken extruded while mountains.

  In this case, the end wall has a first folded wall provided in a state of being connected to a side end of the outer edge wall via a first folded line, and a second folded line at an upper end of the outer edge wall. A second folded wall provided in a state of being connected to the outer end wall, wherein the inner end wall is provided in a state of being connected to an upper end of the outer end wall through a third folded line, 3 is folded inward along the folding line so as to overlap with the inner surface of the outer end wall, and the first folding wall is folded inward along the first folding line on the inner surface of the outer edge wall. It is preferable that the second folded wall is overlapped and fixed to the overlapping inner edge wall, and the second folded wall is overlapped and fixed to the inner surface of the outer edge wall in a state of being folded inward along the second folded line.

  In this case, an end piece is provided so as to be continuous with a peripheral portion of the bottom wall on which the end wall is disposed, and a second surface is provided on the surface of the bottom wall on the side of the end wall. Is formed in a recessed state, and the end piece is provided in a state extending upward from a peripheral edge of the bottom wall, and an outer piece overlapping the outer surface of the end wall, An inner piece that is folded downward with respect to the piece and sandwiches at least a part of the end wall body with the outer piece, and provided in a state of being connected to a tip of the inner piece, A second engagement projection engaging with the second engagement recess in a posture along the bottom wall in a state where at least a part of the end wall is sandwiched between the one part and the inner piece; Is preferably included.

  In this case, a second extension portion is provided in a continuous state at a side end of the outer piece portion, and the second extension portion extends along the side wall body together with the extension portion. It is preferable to be sandwiched between the outer plate portion and the inner plate portion.

  In this case, the support wall is formed with a stacked protrusion protruding upward from an upper end portion, and the bottom wall body includes the stacked protrusion of the lower packaging box when a plurality of packaging boxes are stacked. It is preferable that a laminated hole to be inserted is formed.

  Further, in this case, the end wall body is connected to an outer end wall arranged in a standing posture at a peripheral edge of the bottom wall body, and a side end of the outer end wall is connected to a side end of the outer end wall via a lateral ruled line. An outer edge wall provided so as to extend from the side end of the wall toward the side wall body; and an inner end wall overlapped on an inner surface of the outer end wall, wherein the extension portion is a tip of the outer edge wall. The support wall is provided in a state of being connected to the inner end wall via a first fold curve, and has a second fold curve extending in parallel with the first fold curve. A main body wall, a contact wall connected to the main body wall via a third fold curve, and a contact wall provided continuous with the contact wall via a fourth fold curve; A fixed wall fixed to the outer end wall along the side ruled line in a state where the mountain is bent at the third fold curve; A diagonal wall having a stacked projection protruding upward from the main body wall, the diagonal wall being provided in a state of being connected via a five-fold curve; Forming a column having a rectangular cross-section by forming a valley fold at a curve and a mountain fold at the second fold curve; and forming a fold at the contact wall at the third fold curve and a fold at a fourth fold curve. The corner wall is disposed in a state where the corner wall is bent at the fifth fold curve and extends toward the third fold curve, and the laminated protrusion projects above an upper end surface of the support, and the bottom wall body Preferably, a stacking hole into which the stacking projection of the lower packaging box is inserted when a plurality of packaging boxes are stacked.

  ADVANTAGE OF THE INVENTION According to this invention, the state in which the side wall body pinched the extension part can be maintained.

It is a perspective view showing the stacking tray concerning a 1st embodiment of the present invention. It is a top view showing the 1st and 2nd blank of the stacking tray concerning a 1st embodiment of the present invention. It is a top view showing the 3rd blank of the stacking tray concerning a 1st embodiment of the present invention. FIG. 4 is a perspective view showing an end wall or the like of the stacking tray according to the first embodiment of the present invention and showing a state in the middle of a first step. FIG. 2 is an exploded perspective view showing the stacking tray according to the first embodiment of the present invention. It is a top view showing the state where the connection process of the stacking tray concerning a 1st embodiment of the present invention was completed. It is a perspective view explaining the assembly process of the stacking tray concerning a 1st embodiment of the present invention. It is a perspective view which expands and shows the support | pillar etc. of the stacking tray which concerns on 1st Embodiment of this invention. It is IX-IX sectional drawing of FIG. It is a perspective view which expands and shows the engaging piece part etc. of the stacking tray which concerns on 1st Embodiment of this invention. It is a perspective view showing the state where stacking trays concerning a 1st embodiment of the present invention were piled up. FIG. 4 is a perspective view illustrating a stacking operation of the stacking tray according to the first embodiment of the present invention. It is a top view showing the 1st and 2nd blank of the stacking tray concerning a 2nd embodiment of the present invention. It is a top view showing the 3rd blank of the stacking tray concerning a 2nd embodiment of the present invention. It is a top view showing the state where the 1st blank and the 3rd blank of the stacking tray concerning a 2nd embodiment of the present invention were connected. It is sectional drawing explaining the connection process (3rd process) of the stacking tray which concerns on 2nd Embodiment of this invention. It is a top view showing the 1st and 2nd blank of the stacking tray concerning a 3rd embodiment of the present invention. It is a top view showing the engaging convex part and the engaging concave part of the stacking tray concerning the 1st modification of 1st-3rd embodiment of this invention. It is a top view showing the engaging convex part and the engaging concave part of the stacking tray concerning the 2nd modification of 1st-3rd embodiment of this invention. It is a top view showing the engaging convex part and the engaging concave part of the stacking tray concerning the 3rd modification of 1st-3rd embodiment of this invention. It is a top view showing an engaging convex part and an engaging concave part of a stacking tray concerning a 4th modification of a 1st-3rd embodiment of the present invention. It is a perspective view showing the stacking tray concerning a 4th embodiment of the present invention. It is a top view showing the 1st and 2nd blank of a stacking tray concerning a 4th embodiment of the present invention. It is a top view showing the 3rd blank of the stacking tray concerning a 4th embodiment of the present invention. It is a perspective view showing the state where the connection process of the stacking tray concerning a 4th embodiment of the present invention was completed. It is a perspective view which expands and shows the support wall etc. of the stacking tray concerning 4th Embodiment of this invention. It is a perspective view showing the assembly process of the end wall etc. of the stacking tray concerning a 4th embodiment of the present invention. It is a perspective view which expands and shows the support | pillar etc. of the stacking tray concerning 4th Embodiment of this invention. It is a perspective view explaining the assembly process of the stacking tray concerning a 4th embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, "Fr" shown in each figure shows "front", "Rr" shows "back", "L" shows "left", "R" shows "right", and "U" shows "D" indicates "up" and "D" indicates "down". Further, the terms indicating these directions are used for convenience of description, and do not limit the technical scope of the present invention.

[First Embodiment]
A stacking tray 1 as an example of a packaging box according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the stacking tray 1. FIG. 2 is a plan view showing the first and second blanks 1A and 1B of the stacking tray 1. FIG. FIG. 3 is a plan view showing a third blank 1C of the stacking tray 1. FIG.

[Overview of Stacking Tray]
As shown in FIG. 1, the stacking tray 1 has an opening 13 that is continuous from the upper surface to both front and rear surfaces, and is formed in a substantially rectangular parallelepiped shape. The stacking tray 1 is formed so that a plurality of contents (not shown) such as commodities are placed on the bottom wall 10 so that a plurality of stacking trays can be vertically stacked. Four pillars 35A extending in the vertical direction are provided at four corners inside the stacking tray 1. Each column 35A supports the upper stacking tray 1 by abutting against the bottom wall 10 of the stacking tray 1 stacked above.

  The stacking tray 1 includes a pair of end wall members 11 and a pair of side wall members 12 arranged in a standing posture on a peripheral portion of the bottom wall member 10. The bottom wall body 10 is formed in a substantially rectangular shape that is long in the left-right direction when viewed from a plane. Although details will be described later, the bottom wall body 10 is formed by laminating a lower bottom wall 10A, a pair of left and right intermediate bottom walls 10C, and an upper bottom wall 10B. The pair of end walls 11 oppose each other in the left-right direction with the bottom wall 10 interposed therebetween, and the pair of side walls 12 oppose each other in the front-rear direction with the bottom wall 10 interposed therebetween. That is, the side wall body 12 is disposed in a standing posture at a position adjacent to the end wall body 11 at a position shifted from the end wall body 11 by approximately 90 degrees in the circumferential direction. The end wall 11 is formed higher (longer in the vertical direction) than the side wall 12.

  The stacking tray 1 is formed by connecting and assembling the first to third blanks 1A, 1B, 1C shown in FIGS. Each of these first to third blanks 1A, 1B, 1C is formed by punching a single sheet of corrugated cardboard with a die cutter or the like. The corrugated cardboard sheet is, for example, a double-faced corrugated cardboard in which a front liner 5B and a back liner 5C (see FIG. 4) are attached to the front and back of a corrugated middle 5A. 2 and 3 show the front liner 5B side. In the present specification, a direction parallel to the midline 5A of the corrugated cardboard sheet is referred to as a “step direction”, and a direction perpendicular to the step direction is referred to as a “flow direction”. “X” shown in the drawing indicates “stage direction”, and “Y” indicates “flow direction”.

[First blank]
As shown in FIG. 2, the first blank 1A includes a lower bottom wall 10A and a pair of side wall bodies 12. The lower bottom wall 10A is formed so as to be continuous with the pair of side walls 12 (outer plate portion 20). Since the pair of side walls 12 are formed substantially symmetrically in the step direction with the lower bottom wall 10A interposed therebetween, one (the right side in FIG. 2) side wall 12 will be described below.

<Lower bottom wall>
The lower bottom wall 10A is formed in a substantially rectangular shape that is long in the flow direction. At the center of the lower bottom wall 10A in the flow direction, a lower mark M1 is formed at the center of the lower bottom wall 10A in the step direction and at both ends. Further, lower marks M1 are also formed at the four corners of the lower bottom wall 10A. The lower mark M1 is formed by a cutting line that penetrates the blade in the thickness direction of the corrugated cardboard sheet.

<Side wall>
The side wall body 12 includes an outer plate portion 20, an upper plate edge portion 21, an inner plate portion 22, and an engagement protrusion 23. The outer plate portion 20 is provided so as to be continuous with one end of the lower bottom wall 10A in the step direction via the first ruled line L1. The inner plate portion 22 is provided in a state of being connected to a side end portion (tip portion) of the outer plate portion 20 via two second ruled lines L2. An upper plate edge 21 is formed between the two second ruled lines L2. The engagement convex portion 23 is provided in a state of being connected to a side end portion (a distal end portion) of the inner plate portion 22 via a fitting fold curve L3. The first and second ruled lines L1 and L2 are general-purpose ruled lines formed by crushing a corrugated cardboard sheet in the thickness direction from the back liner 5C side. The fitting fold curve L3 is a lead rule in which a plurality of cutting lines are formed at predetermined intervals on an inverted ruled line formed by crushing a corrugated cardboard sheet in the thickness direction from the front liner 5B side.

  The outer plate portion 20 is formed in a substantially trapezoidal shape that becomes narrower in the flow direction from the base end (the lower bottom wall 10A side) to the tip end (the upper plate edge 21 side). For this reason, at both ends (side end portions) in the flow direction of the outer plate portion 20, there are formed inclined portions 20A which are inclined in a direction approaching each other from the base end toward the front end. The step size (projection dimension) of the outer plate portion 20 is set shorter (for example, about 1/4) than the step size of the lower bottom wall 10A.

  The upper plate edge 21 is formed in a substantially rectangular shape that is long in the flow direction, and makes the outer plate 20 and the inner plate 22 continuous. The dimension of the upper plate edge 21 in the flow direction is set substantially equal to the length of the side edge of the outer plate 20. The projecting dimension of the upper plate edge 21 is set slightly longer than the thickness of the corrugated cardboard sheet. A curved hole 21 </ b> A that is curved so as to project to the inner plate portion 22 beyond the second ruled line L <b> 2 is opened in the central region in the flow direction of the upper plate edge portion 21. The curved hole 21 </ b> A is formed with substantially the same width as the projected dimension of the upper plate edge 21. The upper plate edge 21 is formed with an arch protrusion 21B extending from the outer plate 20 along the contour of the curved hole 21A. The second ruled line L2 is not formed on the arch projection 21B. Further, the arch protrusion 21B (curved hole 21A) constitutes the design of the stacking tray 1, and may be omitted if unnecessary.

  The inner plate portion 22 is formed in a substantially trapezoidal shape that becomes narrower in the flow direction from the base end (the upper plate edge 21 side) to the tip end (the engagement protrusion 23 side). The size of the inner plate portion 22 in the flow direction is set substantially equal to the size of the upper plate edge portion 21 in the flow direction. The protrusion size of the inner plate portion 22 is set shorter than the protrusion size of the outer plate portion 20 by the thickness of about two corrugated cardboard sheets.

  A pair of engagement pieces 24 are formed at both ends in the flow direction of the inner plate 22. The pair of engagement pieces 24 extend outward from both ends of the inner plate 22 in the flow direction. A first engagement curve L4 is formed at the boundary between each engagement piece 24 and the inner plate 22. Further, a second engagement curve L5 is formed on each of the engagement pieces 24 outside the first engagement curve L4 in the flow direction. The pair of first engagement fold curves L <b> 4 is inclined in a direction approaching each other from the base end to the front end of the inner plate portion 22. Each of the pair of second engagement folding curves L5 is formed substantially parallel to the step direction. At the outer end in the flow direction of each engagement piece 24, an engagement protrusion 24A protrudes outward. The first and second engagement folding curves L4 and L5 are lead rules in which a plurality of cutting lines are formed at predetermined intervals on a ruled line formed by crushing a corrugated cardboard sheet from both front and back surfaces in the thickness direction.

  The engaging projection 23 is formed in a substantially trapezoidal shape that becomes narrower in the flow direction from the base end (the inner plate portion 22 side) toward the tip end (the free end). The dimension of the engaging projection 23 in the flow direction is set substantially equal to the length of the side edge of the inner plate 22. The projecting dimension of the engaging projection 23 is set shorter (for example, about half) than the projecting dimension of the inner plate 22. In addition, the projecting dimension of the engaging projection 23 may be substantially the same as the projecting dimension of the inner plate 22, or may be slightly longer.

[Second blank]
As shown in FIG. 2, the second blank 1B includes an upper bottom wall 10B. The upper bottom wall 10B is slightly smaller than the lower bottom wall 10A and is formed in a substantially rectangular shape that is long in the stepwise direction. At both ends in the flow direction of the upper bottom wall 10B, a pair of missing portions 25A are formed so as to be recessed inward. The pair of cutouts 25A are cut out in a substantially trapezoidal shape that becomes narrower in the stepwise direction from both ends in the flow direction of the upper bottom wall 10B toward the inside. The defective portion 25A is formed to have substantially the same shape (complementary shape) as the engagement convex portion 23. Although details will be described later, in a state where the stacking tray 1 is assembled (assembled state), the upper bottom wall 10B is disposed above the lower bottom wall 10A, and each of the defective portions 25A is fitted with the engaging projection 23. An engaging concave portion 25 is formed.

[3rd blank]
As shown in FIG. 3, the third blank 1C includes an intermediate bottom wall 10C and an end wall body 11. When assembling the stacking tray 1, two third blanks 1C are used, and a pair of left and right end wall bodies 11 is formed. Since the two third blanks 1C (the pair of end wall bodies 11) have the same shape, only one third blank 1C (one end wall body 11) will be described below.

<Intermediate bottom wall>
The intermediate bottom wall 10C is formed so as to be continuous with one end (lower end in an assembled state) of the end wall 11 (an outer end wall 30 described later) in a stepped manner via a lower ruled line L10. The intermediate bottom wall 10C is formed in a substantially rectangular shape. The dimension of the intermediate bottom wall 10C in the step direction is set to about half of the dimension of the lower bottom wall 10A in the flow direction. The dimension of the intermediate bottom wall 10C in the flow direction is set substantially equal to the dimension of the lower bottom wall 10A in the step direction. A first intermediate mark M2 is formed at one end (free end) in the step direction of the intermediate bottom wall 10C at the center in the flow direction. Further, the first intermediate mark M2 is also formed at two corners (near both ends of the lower ruled line L10) at the other end in the stepwise direction of the intermediate bottom wall 10C. Furthermore, two second intermediate marks M3 are formed in the stepwise central region of the intermediate bottom wall 10C. The first and second intermediate marks M2, M3 are formed by cutting lines.

<End wall>
The end wall body 11 includes an outer end wall 30, a pair of outer edge walls 31, a pair of first folded walls 32, a pair of second folded walls 33, an inner end wall 34, a pair of support walls 35, And a pair of inner edge walls 36. The end wall 11 is formed so as to entirely extend in the stepwise direction.

  The outer end wall 30 is provided so as to be continuous with a boundary with the intermediate bottom wall 10C via a lower ruled line L10. The pair of outer edge walls 31 are provided so as to be continuous with both ends in the flow direction of the outer end wall 30 via the lateral ruled line L11. Each of the pair of first folded walls 32 is provided so as to be connected to the outer end of the outer edge wall 31 in the flow direction via two first folded lines L12. A first edge 32A is formed between the two first folded lines L12. Each of the pair of second folded walls 33 is provided so as to be connected to the other end of the outer edge wall 31 in the step direction (upper end in the assembled state) via two second folded lines L13. A second edge 33A is formed between the two second folded lines L13. The inner end wall 34 is provided in a state of being connected to the other end of the outer end wall 30 in the step direction (the upper end in the assembled state) via the third folded line L14. The pair of support walls 35 are provided so as to be continuous with both ends in the flow direction of the inner end wall 34 via the first folding curve L15. Each of the pair of inner edge walls 36 is provided in a state of being connected to the outer end in the flow direction of the support wall 35 via the second fold curve L16. The lower ruled line L10, the lateral ruled line L11, and the first to third folded lines L12 to L14 are general-purpose ruled lines, respectively. The first and second folding curves L15 and L16 are lead rules in which a plurality of cutting lines are formed at predetermined intervals on the reverse ruled line.

  In addition, since the end wall body 11 is formed substantially symmetrically in the flow direction with a center line extending in the step direction interposed therebetween, one of the pair of walls 31, 32, 33, 35, and 36 will be described below. Will be described.

  The outer end wall 30 has a substantially rectangular outer shape that is long in a stepwise direction. In a central region of the outer end wall 30, an outer end opening 30A having a substantially rectangular shape elongated in a stepwise direction is opened. That is, the outer end wall 30 is formed in a substantially rectangular ring shape.

  The dimension (length in the flow direction) of one end in the step direction (lower ruled line L10) of the outer end wall 30 is set to be substantially the same as the dimension in the step direction of the lower bottom wall 10A. The dimension of the other end of the outer end wall 30 in the step direction (third folded line L14) is set slightly longer than one end of the outer end wall 30. In other words, the outer shape of the outer end wall 30 is formed in a substantially trapezoidal shape that slightly widens in the flow direction from one end in the step direction to the other end. In other words, the outer end wall 30 is formed so as to gradually become wider (longer in the flow direction) from below to above in the assembled state. Both ends (side ruled lines L11) of the outer end wall 30 in the flow direction are inclined about 1 degree outward with respect to the center pin 5A (a line extending perpendicular to the lower ruled line L10).

  The outer edge wall 31 is formed in a substantially rectangular shape that is long in the step direction. The step size of the outer edge wall 31 is set substantially equal to the step size of the outer end wall 30. The dimension (projection dimension) of the outer edge wall 31 in the flow direction is set shorter (for example, about 1/4) than the dimension of the outer end wall 30 in the flow direction. The corner at the other end of the outer edge wall 31 is chamfered in an arc shape.

  A substantially rectangular outer extension 37A is integrally formed at one end (lower in the assembled state) of the outer edge wall 31. The outer extension portion 37A is provided so as to extend outward from an end (front end) in the flow direction of the outer edge wall 31. For this reason, the outer extension portion 37A and the outer edge wall 31 are formed substantially in an L-shape as a whole.

  The first edge portion 32A is formed in a substantially rectangular shape that is long in the stepwise direction, and connects the outer edge wall 31 and the first folded wall 32 to each other. The stepwise dimension of the first edge 32A is set to be substantially the same as the length of the side edge of the outer edge wall 31 excluding the chamfered corner of the outer edge wall 31 and the outer extension 37A. The projecting dimension of the first edge 32A is set slightly longer than the thickness of the corrugated cardboard sheet.

  The first folded wall 32 is formed in a substantially rectangular shape having substantially the same dimension in the stepwise direction as the first edge 32A. The protrusion size of the first folded wall 32 is set longer than the first edge 32A. A corner at the other end of the first folded wall 32 is cut off. The projecting dimension of the outer extension 37A is set to be longer than the projecting dimension of the first folded wall 32.

  The second edge portion 33A is formed in a substantially rectangular shape, and connects the outer edge wall 31 and the second folded wall 33 to each other. The dimension of the second edge 33A in the flow direction is set substantially equal to the length of the other end of the outer edge wall 31 excluding the chamfered corners of the outer edge wall 31. The dimension (projection dimension) of the second edge 33A in the step direction is set slightly longer than the thickness of the cardboard sheet.

  The second folded wall 33 is formed in a substantially rectangular shape having substantially the same size in the flow direction as the second edge 33A. The dimension (projection dimension) of the second folded wall 33 in the step direction is set to be longer than the second edge 33A. The corner at the other end of the second folded wall 33 is cut off.

  The inner end wall 34 has a substantially rectangular outer shape having substantially the same dimension in the stepwise direction as the outer end wall 30. The inner end wall 34 has an inner end opening 34A having the same shape as the outer end opening 30A, and is formed in a substantially rectangular ring shape. The outer shape of the inner end wall 34 except for the vicinity of the third return line L14 is formed in a substantially trapezoidal shape that becomes slightly narrower in the flow direction from one end in the step direction (the third return line L14 side) to the other end. I have. That is, like the outer end wall 30, the inner end wall 34 is formed so as to gradually become wider (longer in the flow direction) from below to above in the assembled state. Both ends in the flow direction of the inner end wall 34 (the first folding line L15) are inclined outward by about 1 degree with respect to the center line 5A (a line extending perpendicular to the third folding line L14). Note that the second and third folding curves L16 and L17 are also inclined at the same angle as the first folding curve L15.

  The support wall 35 is formed in a substantially rectangular shape that is long in the step direction. The support wall 35 is formed so as to bite into the inner end wall 34 by extending a cutting line from the boundary with the second folded wall 33 toward the inside of the inner end wall 34. The stepwise dimension of the support wall 35 is set to be substantially the same as the stepwise dimension of the inner end wall 34 excluding the second folded wall 33. The dimension (projection dimension) of the support wall 35 in the flow direction is set shorter (for example, about half) than the inner end wall 34.

  The support wall 35 is provided in a state of being connected to the inner end wall 34 via the first fold curve L15 and in a state of being connected to the inner edge wall 36 via the second fold curve L16. The support wall 35 has a third fold curve L17 extending parallel to the first fold curve L15 and the second fold curve L16. The third folding curve L17 is formed at a position close to the first folding curve L15 between the first folding curve L15 and the second folding curve L16. The third fold curve L17 is a lead rule formed by forming a plurality of cutting lines at predetermined intervals on a general ruled line. The interval between the first fold curve L15 and the third fold curve L17 is set substantially equal to the interval between the second fold curve L16 and an extension of the side ruled line L11.

  An engagement groove 38 is formed on the other end side (lower side in the assembled state) of the support wall 35 along the second fold curve L16. The engagement groove 38 is a cutting line that extends slightly parallel to the second fold curve L16 on the slightly inner side (the third fold curve L17 side) of the second fold curve L16. A pair of cutting lines are formed in the support wall 35 in the same width as the engagement groove 38 from the second fold curve L16 toward the inside. A tongue-shaped cut piece 38A is formed in a range surrounded by the pair of cutting lines and the engagement groove 38.

  The inner edge wall 36 is formed in a substantially rectangular shape having substantially the same dimensions as the support wall 35 in the step direction. The dimension (projection dimension) of the inner edge wall 36 in the flow direction is set shorter (for example, about half) than the projection dimension of the outer edge wall 31. The protrusion dimension of the inner edge wall 36 is set to be substantially the same as the protrusion dimension of the first folded wall 32.

  On the other end side (the lower side in the assembled state) of the inner edge wall 36, a substantially rectangular inner extension 37B is integrally formed. The inner extension portion 37B is provided so as to extend outward from the flow direction end portion (tip portion) of the inner edge wall 36. For this reason, the inner extended portion 37B and the inner edge wall 36 are formed substantially in an L-shape as a whole.

  When the inner end wall 34, the pair of support walls 35, the pair of inner edge walls 36, the pair of inner extension portions 37B, and the like are turned around the third folded line L14, the outer end wall 30, the pair of outer edge walls 31 And it is formed in the shape substantially matching with the pair of outer extension portions 37A.

  As described above, the first blank 1A (lower bottom wall 10A, side wall body 12), the second blank 1B (upper bottom wall 10B), and the third blank 1C (intermediate bottom wall 10C, end wall body 11) Are formed separately from each other, the stacking tray 1 is assembled after connecting the first to third blanks 1A, 1B, 1C. The connecting process and the assembling process of the first to third blanks 1A, 1B, 1C may be performed, for example, manually by an operator or automatically or semi-automatically by a dedicated box making machine or the like. Here, a case will be described in which an operator manually performs a connection step and an assembly step.

[Connection process]
Next, a step of connecting the first to third blanks 1A, 1B, 1C (a connecting step) will be described with reference to FIGS. FIG. 4 is a perspective view showing a state of the end wall 11 and the like in the middle of the first step. FIG. 5 is an exploded perspective view showing the stacking tray 1. FIG. 6 is a plan view showing a state where the connecting step of the stacking tray 1 is completed.

<First step>
First, an operator forms the end wall body 11 used in the assembling process (first process). For example, the worker places the third blank 1C on the workbench with the back liner 5C facing upward, and attaches a double-sided tape to the inner end wall 34 (around the inner end opening 34A) and each inner extension 37B. (Not shown). Note that no double-sided tape is attached to the support wall 35.

  Subsequently, as illustrated in FIG. 4, the operator folds (reverses) the inner end wall 34 toward the outer end wall 30 along the third fold line L14. Then, the inner end wall 34 is overlaid on the inner surface (the back liner 5C) of the outer end wall 30 and is adhered to the inner surface of the outer end wall 30 via a double-sided tape. The support wall 35 is overlapped on the inner surfaces of the outer end wall 30 and the outer edge wall 31 (see FIG. 3) across the side ruled line L11. The inner edge wall 36 is overlaid on the inner surface of the outer edge wall 31. The inner extension 37B is superimposed on the inner surface of the outer extension 37A, and is adhered to the inner surface of the outer extension 37A via a double-sided tape.

  Next, the worker applies a double-sided tape to each of the first folded walls 32 and each of the second folded walls 33. Then, the operator folds each first edge 32A and each first folded wall 32 inward along two first folded lines L12. In this state, the first folded wall 32 overlaps the inner edge wall 36 overlapping the inner surface of the outer edge wall 31 and is bonded (fixed) to the outer surface (front liner 5B) of the inner edge wall 36 via a double-sided tape. In addition, the operator folds each second edge portion 33A and each second folded wall 33 inward along two second folded lines L13. The second folded wall 33 overlaps the inner surface of the outer edge wall 31 in this state, and is bonded (fixed) to the inner surface (the back liner 5C) of the outer edge wall 31 via a double-sided tape. In addition, the tip of the folded second edge 33 </ b> A abuts on the tip of the support wall 35 (the upper end in the assembled state).

  As described above, the first step is completed, and the end wall body 11 in which two corrugated cardboard sheets are stacked is completed (see FIG. 5). The middle 5A of the two corrugated cardboard sheets forming the end wall 11 extends in the same direction. Since two end walls 11 are required for assembling the stacking tray 1, the operator repeats the first step to form two end walls 11.

<Second step>
Next, the operator connects the first blank 1A (the lower bottom wall 10A, the side wall body 12) and the end wall body 11 (second step). The operator attaches a double-sided tape to the front liner 5B of the intermediate bottom wall 10C extending from each end wall body 11. Subsequently, as shown in FIG. 5, the operator places the first blank 1A on the work table with the back liner 5C facing upward, and moves the pair of end walls 11 in the flow direction of the lower bottom wall 10A. Place on both sides. Then, the worker adheres the pair of intermediate bottom walls 10C to the upper surface (the back liner 5C) of the lower bottom wall 10A. The pair of intermediate bottom walls 10C are adhered to the lower bottom wall 10A via a double-sided tape, with their tips abutting at the center of the lower bottom wall 10A in the flow direction (see FIG. 6). At this time, the operator aligns each of the first intermediate marks M2 of the intermediate bottom wall 10C with each of the lower marks M1 of the lower bottom wall 10A, thereby performing alignment between the lower bottom wall 10A and the intermediate bottom wall 10C.

  Thus, the second step is completed, and the pair of end walls 11 and the lower bottom wall 10A are connected via the pair of intermediate bottom walls 10C. In this state, the middle shin 5A of the intermediate bottom wall 10C and the middle shin 5A of the lower bottom wall 10A extend in directions orthogonal to each other.

<Third step>
Next, the operator connects the second blank 1B (upper bottom wall 10B) to each intermediate bottom wall 10C (third step). The operator attaches a double-sided tape to the back liner 5C of the upper bottom wall 10B. Then, as shown in FIGS. 5 and 6, the worker adheres the upper bottom wall 10B with the front liner 5B facing upward to the upper surfaces of the pair of intermediate bottom walls 10C (the back liner 5C). The upper bottom wall 10B is bonded to each intermediate bottom wall 10C via a double-sided tape with the pair of defective portions 25A facing the pair of side wall bodies 12. At this time, the operator aligns the outline of each of the defective portions 25A of the upper bottom wall 10B with each of the second intermediate marks M3 of each of the intermediate bottom walls 10C, thereby aligning each of the intermediate bottom walls 10C and the upper bottom wall 10B. I do.

  Thus, the third step is completed, and each intermediate bottom wall 10C and the upper bottom wall 10B are connected (see FIG. 6). This completes the connection step. In this state, the upper bottom wall 10B is arranged above the lower bottom wall 10A, and each intermediate bottom wall 10C is fixed in a state of being sandwiched between the lower bottom wall 10A and the upper bottom wall 10B ( (See FIG. 9). That is, the bottom wall body 10 having a triple laminated structure in which the lower bottom wall 10A, the intermediate bottom wall 10C, and the upper bottom wall 10B are laminated is formed. As shown in FIG. 5, the midsole 5A of the intermediate bottom wall 10C and the midsole 5A of the upper bottom wall 10B extend in the same direction. In addition, the center shin 5A of the lower bottom wall 10A and the center shin 5A of the upper bottom wall 10B extend in directions orthogonal to each other. Further, as shown in FIG. 6, in a state where the upper bottom wall 10B is adhered to the intermediate bottom wall 10C, a pair of engagements is made in a range surrounded by the upper surfaces of the pair of intermediate bottom walls 10C and the pair of cutouts 25A. A recess 25 is formed (see FIG. 6). The pair of engagement recesses 25 are formed so as to be recessed in the upper surface of the bottom wall body 10.

  In addition, the pasting position of the double-sided tape in the connecting step described above is an example, and the pasting position and the number of the double-sided tapes may be appropriately changed. In the above-described connecting step, a double-sided tape is used as an example. However, instead of this, for example, an adhesive (a hot-melt adhesive, a resin-based emulsion adhesive, a starch-based adhesive, or the like) may be used. Good.

[Assembly process]
Next, an assembly process of the stacking tray 1 will be described with reference to FIGS. FIG. 7 is a perspective view illustrating an assembly process of the stacking tray 1. FIG. 8 is an enlarged perspective view showing the support 35A and the like. FIG. 9 is a sectional view taken along line IX-IX of FIG. FIG. 10 is an enlarged perspective view showing the engagement piece 24 and the like. Here, a case where the worker performs the assembly process manually will be described.

  The stacking tray 1 is assembled by appropriately bending the connected first to third blanks 1A, 1B, 1C. As shown in FIG. 7, the operator bends the pair of left and right outer end walls 30 upward along the lower ruled line L10. The end wall body 11 (outer end wall 30) is bent substantially at right angles to the bottom wall body 10, and is provided in an upright posture on a peripheral portion (short side) of the bottom wall body 10.

  Subsequently, the operator bends the four outer edge walls 31 located at the four corners of the bottom wall body 10 inward (toward the bottom wall body 10) along the side ruled line L11. Then, the outer edge wall 31 is bent substantially at right angles to the outer end wall 30, and is provided so as to extend from the side end of the outer end wall 30 toward the side wall body 12. In conjunction with the bending of the outer edge wall 31, the inner edge wall 36 is bent substantially at right angles to the support wall 35 along the second folding curve L <b> 16, and from the side end of the support wall 35 toward the side wall body 12. It is provided in an extended state. The outer extension portion 37A and the inner extension portion 37B (hereinafter, also simply referred to as “extension portion 37”) are provided in a state of standing substantially vertically on the first ruled line L1 and extending toward the side wall body 12. . The extension portions 37 facing each other in the left-right direction do not contact each other, and extend to a position overlapping the engagement recess 25. In addition, since the inclined portions 20A are formed at both left and right end portions of the outer plate portion 20, it is possible to suppress the outer edge wall 31 and the like from being caught on the end of the outer plate portion 20 at the time of bending the outer edge wall 31 and the like. it can. Thereby, the bending work of the outer edge wall 31 and the like can be performed smoothly.

  As shown in FIG. 8, when the inner edge wall 36 is bent in conjunction with the bending of the outer edge wall 31, the support wall 35 is not adhered to the outer end wall 30 and the like, so that the portion where the third fold curve L17 is formed is positioned inside. (See the thick broken arrow in FIG. 8), and bends at the first and second folding curves L15 and L16. In other words, the support wall 35 is formed such that the inner edge wall 36 is trough-folded at the second fold curve L16, so that the valley-fold is formed at the first fold curve L15, and the third fold curve L17 is mountain-folded while being pushed inward. A column 35A having a cross section is formed. The surface of the support wall 35 between the second fold curve L16 and the third fold curve L17 is bent substantially at right angles to the inner edge wall 36, and is provided substantially parallel to the inner surface of the outer end wall 30. Further, the surface of the support wall 35 between the first fold curve L15 and the third fold curve L17 is bent substantially at right angles to the inner end wall 34 and provided substantially parallel to the inner surface of the outer edge wall 31. .

  The support wall 35 (post 35A) is provided in a state protruding substantially in an L shape from the corner formed by the outer end wall 30 and the outer edge wall 31 toward the inside of the stacking tray 1 when viewed from a plane. I have. That is, the four pillars 35A are formed in the shape of a rectangular tube at the four corners of the stacking tray 1. Each of the columns 35A extends upward from the upper surface of the bottom wall body 10. The upper end surface of each support wall 35 (post 35A) is lower than the uppermost end surface of the end wall body 11 (the upper end surface of the outer end wall 30, the inner end wall 34, and the like) by the height of the second folded wall 33. Is provided.

  Next, as shown in FIG. 9, the operator bends the pair of front and rear outer plates 20 upward along the first ruled line L1. The outer plate part 20 is bent substantially at right angles to the bottom wall body 10 and is provided so as to extend upward from a peripheral portion (long side) of the bottom wall body 10. In this state, the outer plate portion 20 overlaps the outer surface of each outer extension portion 37A.

  Subsequently, the operator bends the pair of front and rear upper plate edges 21 and the pair of front and rear inner plates 22 along the two second ruled lines L2 so as to wind the pair of left and right extension portions 37 from above. The upper plate edge 21 is disposed above the extension 37. The inner plate portion 22 is folded downward so as to cover the upper portion of each extension portion 37 with respect to the outer plate portion 20, and sandwiches each extension portion 37 with the outer plate portion 20. Note that, at the time of the folding operation of the inner plate portion 22 and the like, the engaging piece portions 24 connected to the left and right sides of the inner plate portion 22 hit the outer edge wall 31 and the like and bend outward at the first engagement folding curve L4 (see FIG. 10). ), The work of turning the inner plate portion 22 and the like can be performed smoothly. In addition, the arch protrusion 21B projects relatively higher than the upper plate edge 21 by bending the outer plate 20, the upper plate edge 21 and the inner plate 22 (see FIG. 1).

  Subsequently, the operator bends the pair of front and rear engaging projections 23 along the fitting fold curve L3 so that the front liner 5B is on the inside, and the pair of front and rear engaging projections 23 is engaged with the pair of front and rear engaging recesses. 25. The engaging projection 23 is bent at a substantially right angle with respect to the inner plate 22, and takes a posture along the upper surface of the bottom wall body 10. The engagement protrusion 23 fits (engages) with the engagement recess 25 in a posture along the bottom wall body 10 in a state where the extension portions 37 are sandwiched between the outer plate portion 20 and the inner plate portion 22. The engagement convex portion 23 forms a substantially same plane as the upper surface of the bottom wall body 10 (upper bottom wall 10B) in a state fitted in the engagement concave portion 25.

  Next, as shown in FIG. 10, the operator pushes the pair of left and right engagement pieces 24 of each inner plate 22 into the step between the lower end of the first folded wall 32 and the inner edge wall 36. The engagement piece 24 is bent along the first and second engagement folding curves L4 and L5 by bringing the engagement projection 24A into contact with the cut piece 38A (see FIG. 8). When the engagement piece 24 is pushed to fill the step between the lower end of the first folded wall 32 and the inner edge wall 36 while the engagement projection 24A pushes the notch 38A into the support 35A, the engagement projection 24A Engages with the engagement groove 38 (see FIG. 1).

  Thus, the assembly operation of the stacking tray 1 is completed (see FIG. 1). In this state, the center shin 5A of each of the end wall 11, the outer plate 20, and the inner plate 22 extends in the vertical direction. The user stores contents such as products on the upper surface of the bottom wall 10. In addition, since the end openings 30A and 34A are formed on the left and right end surfaces, and the openings 13 are formed on the front and rear side surfaces and the upper surface, the contents inside the stacking tray 1 can be checked from the outside four sides (visual observation). )can do. If it is not necessary to make the contents visible from the outside, the outer end opening 30A and the inner end opening 34A may be omitted.

[Lamination action]
Next, the stacking operation of the stacking tray 1 will be described with reference to FIGS. FIG. 11 is a perspective view showing a state where the stacking trays 1 are stacked. FIG. 12 is a perspective view illustrating the stacking operation of the stacking tray 1.

  A plurality of stacking trays 1 can be stacked. Hereinafter, a case where two stacking trays 1 are stacked will be described for simplicity. In the following description, for convenience, the lower stacking tray 1 is also referred to as “lower tray 1 (D)”, and the reference numeral “(D)” is added to each component of the lower tray 1 (D), and the upper stacking tray 1 is added. 1 is also referred to as “upper tray 1 (U)”, and a symbol “(U)” is added to each component of the upper tray 1 (U).

  First, the operator arranges the upper tray 1 (U) in the same direction above the lower tray 1 (D), and lowers the upper tray 1 (U). The operator causes the bottom wall 10 (U) of the upper tray 1 (U) to enter the opening 13 (D) of the lower tray 1 (D), and the four lower corners of the bottom wall 10 (U). Is placed on the upper end surfaces of the four columns 35A (D). Thus, the upper tray 1 (U) is stacked on the lower tray 1 (D).

  In the stacking tray 1 according to the first embodiment described above, the engagement protrusion 23 engages in a posture substantially parallel to the bottom wall 10 with the side wall 12 having the double wall structure sandwiching the extension 37. It was configured to fit (engage) with the recess 25 (see FIG. 9). According to this configuration, when the extension portion 37 lifts the side wall body 12 by the force of tilting the end wall body 11 outward, the side wall body 12 is expanded (the state before the outer plate portion 20 and the inner plate portion 22 and the like are bent). As shown in FIG. 9, the tip of the engaging projection 23 abuts against the inner surface of the engaging recess 25 (the cross section of the defective portion 25A). As described above, since the engaging projections 23 are caught by the engaging recesses 25 and are difficult to be removed from the engaging recesses 25, it is possible to prevent the side wall body 12 from being unfolded. Thereby, the state where the side wall body 12 sandwiches the extension part 37 can be maintained. As a result, when a plurality of stacking trays 1 are stacked, the assembled state of the lower stacking trays 1 receiving a load can be maintained.

  Further, according to the stacking tray 1 according to the first embodiment, the engagement piece 24 is engaged with the engagement groove 38 in a state where the engagement protrusion 23 is fitted into the engagement recess 25, so that the inner The rotation of the plate portion 22 in the unfolding direction can be effectively prevented. This makes it possible to maintain a state in which the engaging projections 23 are fitted into the engaging recesses 25, and to more effectively maintain a state in which the side walls 12 sandwich the extension 37.

  Further, in the stacking tray 1 according to the first embodiment, the bottom wall body 10 is configured to include two corrugated cardboard sheets (the lower bottom wall 10A and the upper bottom wall 10B) in which the middle 5A is orthogonal (see FIG. 5). ). According to this configuration, the bending rigidity, the torsional rigidity, and the like of the bottom wall body 10 can be improved as compared with the case where the inner fins 5A of the lower bottom wall 10A and the upper bottom wall 10B are aligned in the same direction. . As a result, even heavy contents can be properly accommodated.

  Further, according to the stacking tray 1 according to the first embodiment, the bottom wall body 10 has a triple laminated structure in which a lower bottom wall 10A, a pair of intermediate bottom walls 10C, and an upper bottom wall 10B are stacked (see FIG. 9). Therefore, the rigidity and loading strength of the bottom wall 10 can be further improved. Further, by sandwiching the intermediate bottom wall 10C between the lower bottom wall 10A and the upper bottom wall 10B, the end wall body 11 can be firmly connected to the bottom wall body 10.

  Further, in the stacking tray 1 according to the first embodiment, the end walls 11 and the like have a double laminated structure, and the center 5A of the end walls 11 extends in the vertical direction (see FIG. 4). According to this configuration, the axial rigidity, compressive strength, and the like of the end wall body 11 can be improved as compared with a case where the middle 5A of the end wall body 11 is extended in the lateral direction (the direction perpendicular to the loading direction). Can be. Thereby, a plurality of stacking trays 1 containing heavy contents can be stacked.

  Further, according to the stacking tray 1 according to the first embodiment, since the inner edge wall 36 is trough-folded at the second fold curve L16, the support wall 35 is automatically formed at the first to third fold curves L15, L16, and L17. (See FIG. 8). According to this configuration, the column 35A for supporting the upper stacking tray 1 (the upper tray 1 (U)) can be easily formed in a short time.

  Further, according to the stacking tray 1 according to the first embodiment, the end walls 11 (the outer end wall 30 and the inner end wall 34) are gradually increased from below to above when viewed from the toe side (left-right direction). The opening 13 can be formed wider than the bottom wall 10. Thus, when the bottom wall 10 (U) of the upper tray 1 (U) enters the opening 13 (D) of the lower tray 1 (D), the bottom wall 10 (U) is moved to the lower tray 1 (U). D) can be prevented from being caught on the upper end portion or the like of the end wall body 11 (D). Thus, the upper tray 1 (U) can smoothly enter the lower tray 1 (D), and the stacking trays 1 can be easily stacked.

  Further, according to the stacking tray 1 according to the first embodiment, the end surface (cut surface) of the inner edge wall 36 can be covered by folding the first folded wall 32 and overlapping the inner edge wall 36. In addition, by folding back the second folded wall 33 and overlapping the outer peripheral wall 31, the end face (cut surface) of the outer peripheral wall 31 can be covered. This makes it possible to hide the middle shin 5A and the like appearing on the end face of the corrugated cardboard sheet, and to provide the stacking tray 1 having good design properties.

[Second embodiment]
Next, a stacking tray 2 according to a second embodiment will be described with reference to FIGS. FIG. 13 is a plan view showing the first and second blanks 2A and 2B of the stacking tray 2. FIG. FIG. 14 is a plan view showing a third blank 2C of the stacking tray 2. FIG. FIG. 15 is a plan view showing a state where the first blank 2A and the third blank 2C are connected. FIG. 16 is a cross-sectional view illustrating the connecting step (third step) of the stacking tray 2. In the following description, the same components as those of the stacking tray 1 according to the first embodiment are denoted by the same reference numerals, and the same description will be omitted.

  The stacking tray 2 is formed by connecting and assembling the first to third blanks 2A, 2B, 2C shown in FIGS. Each of these first to third blanks 2A, 2B, 2C is formed by punching a single paper corrugated cardboard sheet (double-sided corrugated cardboard) with a die cutter or the like.

[First blank]
As shown in FIG. 13, the first blank 2A includes a lower bottom wall 10A and a pair of side wall bodies 12. The first blank 2A is substantially the same as the first blank 1A of the first embodiment, but the size of the lower bottom wall 10A in the flow direction is slightly smaller than the size of the base end of the outer plate 20 in the flow direction. It is formed short. For this reason, both ends in the flow direction of the lower bottom wall 10A are slightly recessed inward in the flow direction from the pair of side walls 12 (the outer plate portion 20). The lower mark M1 is omitted from the lower bottom wall 10A.

[Second blank]
The second blank 2B includes an upper bottom wall 40B. On both sides in the flow direction of the upper bottom wall 40B, a pair of score lines L21 (cutting lines) are formed along the contour of the defective portion 25A while leaving one side inside as a bottom wall folded line L20 (general ruled line or lead ruled line). Is formed. The pair of cut lines L21 extend from both ends in the step direction of the bottom wall folded line L20 toward the flow direction end of the upper bottom wall 40B. That is, a range surrounded by the bottom wall folded line L20 and the pair of score lines L21 (hereinafter, also referred to as the “deficient folded portion 41”) is formed in a substantially trapezoidal shape so as to form the defective portion 25A. . The pair of missing portions 25A are formed in a state where the missing folded portion 41 (a part of the upper bottom wall 40B) is folded downward along the bottom wall folded line L20. Note that two upper marks M4 (cutting lines) are formed on the upper bottom wall 40B at the center of the two bottom wall folded lines L20 in the step direction.

[3rd blank]
As shown in FIG. 14, the third blank 2C includes an intermediate bottom wall 40C and an end wall body 11.

  At one end (free end) of the intermediate bottom wall 40C in the step direction, a connection convex portion 42A and a connection concave portion 42B are formed side by side in the flow direction. The connection protrusion 42A protrudes outward from the free end of the intermediate bottom wall 40C, and the connection recess 42B is recessed inward from the free end of the intermediate bottom wall 40C. On the intermediate bottom wall 40C, a pair of fitting grooves 43 are formed at positions sandwiching the connecting protrusion 42A and the connecting recess 42B from both sides in the flow direction. Each fitting groove 43 is a notch extending inward from the free end of the intermediate bottom wall 40C. Each fitting groove 43 is formed so as to fit the turned-back portion 41 which is inverted along the bottom wall folding line L20 in the upper bottom wall 40B. The first and second intermediate marks M2 and M3 are omitted from the intermediate bottom wall 10C.

  A contact portion 44 is connected to one end (the lower end in the assembled state) of each outer edge wall 31 of the end wall body 11 through a cutout line L22 such as a sewing line. Each of the pair of contact portions 44 is formed in a substantially triangular shape, and has an inclined side portion 44A corresponding to the inclined portion 20A of the outer plate portion 20. The inclined sides 44A of the pair of contact portions 44 are inclined so as to be separated from both ends in the flow direction of the lower ruled line L10 toward the intermediate bottom wall 40C. Note that the inner end wall 34 is provided in a state of being connected to the other end of the outer end wall 30 in the stepwise direction (the upper end in the assembled state) via two third return lines L14. A third edge 34B is formed between the two third folded lines L14.

[Connection process]
Next, a connecting process of the first to third blanks 2A, 2B, 2C will be described with reference to FIGS. Here, a case in which the operator manually performs the connection step will be described.

  First, the operator forms the end wall 11 in the same procedure as in the first step of the connecting step described above. Next, the operator performs the second step. The operator attaches a double-sided tape to the front liner 5B of the pair of intermediate bottom walls 40C, and arranges the pair of end walls 11 on both sides in the flow direction of the lower bottom wall 10A on the worktable. As shown in FIG. 15, when the worker brings the pair of intermediate bottom walls 40C closer to each other with the pair of intermediate bottom walls 40C arranged on the upper surface of the lower bottom wall 10A, the inclination of the pair of front and rear contact portions 44 is increased. The side portion 44A abuts on the inclined portion 20A of the pair of front and rear outer plate portions 20. Then, the pair of intermediate bottom walls 40C is positioned on the lower bottom wall 10A. In this state, the worker fits one connecting protrusion 42A into the other connecting recess 42B while bending each intermediate bottom wall 40C, and fits the other connecting protrusion 42A into the one connecting recess 42B. Thereafter, the worker firmly presses each intermediate bottom wall 40C against the lower bottom wall 10A, whereby each intermediate bottom wall 40C is bonded to the lower bottom wall 10A via a double-sided tape (the second step is completed). After the completion of the second step, each contact portion 44 is cut from the outer edge wall 31 along the cutoff line L22 and is discarded. In the state where the second step is completed, the fitting groove 43 of one intermediate bottom wall 40C and the fitting groove 43 of the other intermediate bottom wall 40C are connected to one.

  Next, the operator performs the third step. As shown in FIG. 16, the operator inverts the pair of missing folded portions 41 of the upper bottom wall 40B downward to form the missing portion 25A. Subsequently, the worker attaches a double-sided tape to the central portion of the lower surface of the upper bottom wall 40B and the lower surfaces of the folded back portions 41. The operator adheres the upper bottom wall 40B with the front liner 5B facing upward to the upper surfaces of the pair of intermediate bottom walls 40C. Specifically, the operator aligns each upper mark M4 (see FIG. 13) of the upper bottom wall 40B with the center seam of the pair of intermediate bottom walls 40C, so that each intermediate bottom wall 40C and the upper bottom wall 10B are connected to each other. Is aligned. Then, the operator fits the pair of missing folded portions 41 folded on the lower surface of the upper bottom wall 40B into the pair of fitting grooves 43 connected at the center of the pair of intermediate bottom walls 40C. As described above, the upper bottom wall 40B is adhered to each intermediate bottom wall 10C via the double-sided tape in a state where the pair of missing folded portions 41 are fitted into the pair of fitting grooves 43 (the third step is completed). .

  Thus, the connecting step is completed. In this state, similarly to the stacking tray 1 according to the first embodiment, a bottom wall body 10 having a three-layer structure is formed, and a pair of engagement recesses 25 is formed on the upper surface of the bottom wall body 10. 6 and FIG. 9). Thereafter, the stacking tray 2 is assembled in substantially the same procedure as the above-described assembling process (see FIG. 1 and the like).

  According to the stacking tray 2 according to the second embodiment described above, the same effects as those of the stacking tray 1 according to the first embodiment can be obtained. Further, according to the stacking tray 2 according to the second embodiment, the intermediate bottom wall 40C is brought into contact with the lower bottom wall 10A only by abutting the contact portion 44 of the end wall body 11 against the inclined portion 20A of the outer plate portion 20. Can be positioned easily and accurately.

  In addition, since the missing folded portion 41 (part of the upper bottom wall 40B) folded back at the bottom wall folded line L20 fits into the fitting groove 43 of the intermediate bottom wall 40C, the upper bottom wall 40B is attached to the intermediate bottom wall 40C. And can be easily and accurately aligned.

  Note that the contact portion 44 described above may be provided on the outer edge wall 31 of the stacking tray 1 according to the first embodiment. Further, in the stacking tray 2 according to the second embodiment, the contact portion 44 may be omitted, and the intermediate bottom wall 40C may be positioned by the lower mark M1 formed on the lower bottom wall 10A.

  In the stacking trays 1 and 2 according to the first and second embodiments, the inner bottom 5A of the upper bottom walls 10B and 40B and the intermediate bottom walls 10C and 40C is aligned in the same direction, but is not limited to this. , May be orthogonal (intersecting) to each other. In addition, the inner shin 5A between the lower bottom wall 10A and the upper bottom walls 10B, 40B (the intermediate bottom walls 10C, 40C) is orthogonal to each other, but is not limited thereto, and may intersect at an angle other than 90 degrees. Good. In the stacking trays 1 and 2 according to the first and second embodiments, the pair of intermediate bottom walls 10C is sandwiched between the lower bottom wall 10A and the upper bottom wall 10B, but the present invention is not limited to this. Not done. For example, a pair of intermediate bottom walls 10C may be bonded to the lower surface of lower bottom wall 10A.

  Further, in the stacking trays 1 and 2 according to the first and second embodiments, the outer extension portion 37A and the inner extension portion 37B are bonded, but the present invention is not limited to this. For example, one of the outer extension 37A and the inner extension 37B may be omitted. Further, in the stacking trays 1 and 2 according to the first and second embodiments, the engaging pieces 24 are engaged with the end wall body 11 to assist in suppressing the expansion of the side wall body 12. It is not limited to this. For example, if the state in which the side wall body 12 sandwiches the extension portion 37 can be effectively maintained only by the engagement between the engagement convex portion 23 and the engagement concave portion 25, the engagement piece portion 24 and the engagement groove 38 are formed. It may be omitted.

[Third embodiment]
In the stacking trays 1 and 2 according to the first and second embodiments described above, the bottom wall body 10 is formed in a triple laminated structure, and the end wall body 11 is formed in a double laminated structure. It is not limited to this. For example, as the stacking tray 3 according to the third embodiment, the bottom wall 50 may be formed of two corrugated sheets, and the end wall 51 may be formed of one corrugated sheet. Hereinafter, the stacking tray 3 according to the third embodiment will be briefly described with reference to FIG. FIG. 17 is a plan view showing the first and second blanks 3A and 3B of the stacking tray 3. FIG. In the following description, the same components as those of the stacking tray 1 according to the first embodiment are denoted by the same reference numerals, and the same description will be omitted.

  The first blank 3A includes a lower bottom wall 50A, a pair of end walls 51, and a pair of side walls 12, and the second blank 3B includes an upper bottom wall 50B. In this case, the intermediate bottom wall 10C, the outer end wall 30, the outer edge wall 31, the first and second folded walls 32 and 33, which are the components of the stacking tray 1 according to the first embodiment, are omitted. Each end wall body 51 includes an inner end wall 34, a support wall 35, an inner edge wall 36, an inner extension 37B, and the like. The center blank 5A of the first blank 3A extends in a direction parallel to the long side of the lower bottom wall 50A. The middle blank 5A of the second blank 3B extends in a direction parallel to the short side of the upper bottom wall 50B. The operator adheres the upper bottom wall 50B to the upper surface of the lower bottom wall 50A to form the bottom wall 50 having a double laminated structure, and stands the end wall 51 and the side wall 12 around the bottom wall 50. By raising, the stacking tray 3 can be assembled. In addition, the center 5A of the lower bottom wall 50A and the upper bottom wall 50B may intersect at an angle other than 90 degrees.

  As a modification of the third embodiment, for example, the upper bottom wall 50B may be omitted, and the bottom wall body 50 may be formed of only the lower bottom wall 50A (not shown). In this case, for example, the lower bottom wall 50A, the pair of side wall bodies 12 and the one Is preferably formed. In this case, it is preferable to form the engaging concave portion 25 on the lower bottom wall 50A and form the engaging convex portion 23 on the side wall body 12 (the inner plate portion 22) by partially removing the single-sided cardboard. .

  In the stacking trays 1 to 3 according to the first to third embodiments (including modified examples, the same applies hereinafter), the engaging projections 23 are formed in a substantially trapezoidal shape narrowing from the base end to the tip end. Correspondingly, the engaging recess 25 is formed in a substantially trapezoidal shape in which the width becomes narrower inward from the ends (edges) of the bottom walls 10, 50, but the present invention is not limited to this. . For example, as shown in FIG. 18A, the engagement protrusion 23 is formed in a substantially trapezoidal shape that becomes wider from the base end to the tip, and the engagement recess 25 is formed inward from the end of the bottom wall bodies 10 and 50. It may be formed in a substantially trapezoidal shape that becomes wider toward the end (first modification). In addition, for example, as shown in FIG. 18B, the engaging protrusion 23 and the engaging recess 25 may be formed in an uneven shape (comb shape) (second modification). In addition, the engagement projection 23 and the like may be formed in a triangular shape, a rectangular shape, a semicircular shape, or the like (not shown).

  Further, in the stacking trays 1 to 3 according to the first to third embodiments, the engaging projections 23 and the engaging recesses 25 are formed long in the left-right direction, but the present invention is not limited to this. For example, as shown in FIG. 19A, even if the engagement protrusion 23 is formed at the center in the left-right direction of the inner plate 22, and the engagement recess 25 is formed at the center in the left-right direction of the bottom walls 10, 50. Good (third modification). In addition, for example, as shown in FIG. 19B, a plurality (for example, two in FIG. 19B) of the engagement protrusions 23 and the engagement recesses 25 are formed at predetermined intervals (discrete) in the left-right direction. (Fourth modification).

[Fourth embodiment]
Next, a stacking tray 4 according to a fourth embodiment will be described with reference to FIGS. FIG. 20 is a perspective view showing the stacking tray 4. FIG. 21 is a plan view showing the first and second blanks 4A and 4B of the stacking tray 4. FIG. FIG. 22 is a plan view showing a third blank 4C of the stacking tray 4. FIG. In the following description, the same reference numerals are given to the same or corresponding components as the stacking tray 1 according to the first embodiment, and the same description will be omitted.

[Overview of Stacking Tray]
As shown in FIG. 20, the stacking tray 4 according to the fourth embodiment is different from the stacking tray 1 according to the first embodiment in that the rear surface is closed and has an opening 63 continuous from the front surface to the upper surface. are doing. Further, the stacking tray 4 includes an end piece 66 provided in a state of being connected to a peripheral portion of the bottom wall body 60 on which the end wall body 61 is disposed, and a stacked protruding portion projecting from the upper end surface of each support 81A. 88 is different from the stacking tray 1 according to the first embodiment (details will be described later). Further, in the stacking tray 4, the bottom wall body 60 is formed of two corrugated cardboard sheets (double laminated structure) (details will be described later).

  The stacking tray 4 is formed by connecting and assembling the first to third blanks 4A, 4B, 4C shown in FIGS. Each of the first to third blanks 4A, 4B, 4C is formed by punching a single paper cardboard sheet (double-sided cardboard) with a die cutter or the like.

[First blank]
As shown in FIG. 21, the first blank 4A includes a lower bottom wall 60A, a side wall body 12, a back wall 65, and a pair of end pieces 66. The side wall body 12 and the rear wall 65 are provided in a state of being connected to both ends in the step direction of the lower bottom wall 60A via the first ruled line L1. The pair of end pieces 66 are provided at both ends in the flow direction of the lower bottom wall 60A in a state of being connected via a third ruled line L30. The side wall body 12 has a different shape from the side wall body 12 in the first embodiment, and the curved hole 21A, the engagement piece 24, and the like are omitted. However, the basic function of the side wall body 12 is as follows. Since it is the same as the side wall body 12 in the embodiment, the description and the like are omitted. Since the pair of end pieces 66 are formed substantially symmetrically in the flow direction with the lower bottom wall 60A interposed therebetween, one end piece 66 (right side in FIG. 21) will be described below.

<Lower bottom wall>
The lower bottom wall 60A is formed in a substantially rectangular shape that is long in the flow direction. On the lower bottom wall 60A, a lower mark M1 is formed at the center in the flow direction and at the stepwise end on the side of the rear wall 65. Near the four corners of the lower bottom wall 60A, four laminated holes 67 are formed. Each lamination hole 67 is a slit formed so as to form an angle of approximately 45 degrees with the first ruled line L1 and the third ruled line L30. That is, the vicinity of the four corners of the lower bottom wall 60 </ b> A is partitioned into a right-angled isosceles triangle region by the lamination hole 67.

<Back wall>
The rear wall 65 is formed in a substantially rectangular shape that is long in the flow direction. The dimension of the back wall 65 in the flow direction is set substantially equal to the dimension of the lower bottom wall 60A in the flow direction. The dimension of the rear wall 65 in the step direction is set to be substantially the same as the height of the column 81A. Six sticking marks M5 (cut lines) are formed on both sides of the back wall 65 in the flow direction.

<Outer piece>
The end piece 66 includes an outer piece 70, a frame 71, an inner piece 72, and a second engaging projection 73. The outer piece 70 is provided in a state of being connected to one end of the lower bottom wall 60A in the flow direction via a third ruled line L30. The inner piece 72 is provided in a state of being connected to the tip of the outer piece 70 via two frame folding curves L31. The frame portion 71 is formed between the two frame folding curves L31. The second engaging projection 73 is provided in a state of being connected to the tip of the inner piece 72 via a second fitting fold curve L32. The third ruled line L30 is a general-purpose ruled line, and the frame folding curve L31 and the second fitting folded curve L32 are lead rules.

  The outer piece 70 is formed in a substantially rectangular shape that is long in the step direction. The dimension of the outer piece 70 in the step direction is set substantially equal to the dimension of the lower bottom wall 60A in the step direction. The dimension (projection dimension) of the outer piece 70 in the flow direction is set substantially equal to the projection dimension of the outer plate 20 of the side wall body 12. A second extension 74 is provided at an end (side end) of the outer piece 70 on the side of the side wall body 12 in a state of being connected via an extended fold curve L33 (general ruled line). The second extension portion 74 is formed in a substantially rectangular shape that is long in the stepwise direction, and extends outside the extension of the second ruled line L2 in the stepwise direction.

  The frame portion 71 is provided near the middle of the outer piece portion 70 in the step direction via a frame bent curve L31. The frame portion 71 is formed in a substantially rectangular shape that is long in the stepwise direction, and makes the outer piece portion 70 and the inner piece portion 72 continuous. The dimension of the frame portion 71 in the step direction is set to about half the length of the outer piece portion 70 in the step direction. The projecting dimension of the frame portion 71 is set slightly longer than the thickness of the corrugated cardboard sheet.

  The inner piece 72 and the second engaging projection 73 are formed in a substantially rectangular shape having substantially the same dimensions as the frame 71 in the flow direction. The projecting dimension of the inner piece 72 is set shorter than the projecting dimension of the outer piece 70 by a thickness of about one corrugated cardboard sheet. The projecting dimension of the second engaging projection 73 is set shorter (for example, about half) than the projecting dimension of the inner piece 72. The projecting dimension of the second engaging projection 73 may be substantially the same as the projecting dimension of the inner piece 72, or may be slightly longer.

[Second blank]
As shown in FIG. 21, the second blank 4B includes an upper bottom wall 60B. The upper bottom wall 60B is slightly smaller than the lower bottom wall 60A, and is formed in a substantially rectangular shape that is long in the stepwise direction. The dimension of the upper bottom wall 60B in the flow direction is set to be equal to or less than a value obtained by subtracting the projection dimension of the engaging projection 23 from the step dimension of the lower bottom wall 60A. A substantially semicircular finger hooking concave portion 75A is formed in a recessed state at one end (front end in the assembled state) of the upper bottom wall 60B in the flow direction at the center in the stepwise direction. An upper mark M6 (cut line) is formed at the other end of the upper bottom wall 60B in the flow direction (the rear end in the assembled state) at the center in the stepwise direction.

  At four corners of the upper bottom wall 60B, four pillar cutouts 76 are cut out in a substantially square shape so as to correspond to the four pillars 81A. The two column notches 76 located on both sides in the stepwise direction with the finger hooking recess 75A interposed therebetween are formed smaller than the other two column notches 76. In detail, the two relatively small pillar cutouts 76 are cutout to be shallower than the other two pillar cutouts 76 by the projecting dimension of the engaging projection 23. A pair of second missing portions 77A are formed at both end portions in the step direction of the upper bottom wall 60B so as to be recessed inward. The second defective portion 77A is formed to have substantially the same shape (complementary shape) as the second engagement convex portion 73. At the center of the edge of the second lacking portion 77A in the flow direction, a substantially semicircular finger hooking recess 77B is formed so as to be recessed.

[3rd blank]
As shown in FIG. 22, the third blank 4C includes an end wall 61. When assembling the stacking tray 4, two third blanks 4C having a symmetrical shape are used, and a pair of left and right end wall bodies 61 is formed. Since the two third blanks 4C (the pair of end wall bodies 61) have the same shape when they are inverted, one third blank 4C (the left end wall body 61 in FIG. 22) will be described below. I do.

<End wall>
The end wall body 61 includes an outer end wall 30, an outer edge wall 31, a joint piece 80, an inner end wall 34, and a pair of support walls 81.

  The outer end wall 30 has a substantially rectangular outer shape that is long in the flow direction. The outer edge wall 31 is provided in a state of being connected to one end (side end (front end in an assembled state)) of the outer end wall 30 in the flow direction via a lateral ruled line L11. In the assembled state, a substantially rectangular extension 82 is integrally formed below the outer edge wall 31. The extension portion 82 is provided so as to extend outward from the distal end portion of the outer edge wall 31. For this reason, the extension part 82 and the outer edge wall 31 are formed in a substantially L-shape as a whole. At an intermediate portion of the extension 82, an extension folded line L40 for folding the extension 82 approximately in half is formed. The extended folded line L40 is a half cut line cut about half in the thickness direction from the front liner 5B side, or a sewing line in which a plurality of cut lines are arranged at predetermined intervals.

  The passage piece 80 is provided in a state of being connected to the other end of the outer end wall 30 in the flow direction (the rear end in the assembled state) via the side ruled line L11. The passage piece 80 is formed in a rectangular shape elongated in the step direction, and a passage mark M7 is formed at the center of the passage piece 80 in the step direction.

  The inner end wall 34 is provided in a state where the inner end wall 34 is connected to the stepwise end (upper end in the assembled state) of the outer end wall 30 via two third return lines L14. A third edge 34B is formed between the two third folded lines L14. The pair of support walls 81 are provided in a state of being connected to both ends in the flow direction of the inner end wall 34 via the first folding curve L15.

  In the first embodiment, the outer end wall 30 (inner end wall 34) is formed in a substantially trapezoidal shape that gradually widens from below to above. However, in the fourth embodiment, the outer end wall 30 and the like are lower. From above to a rectangular shape having substantially the same width. Further, in the first embodiment, the side ruled line L11, the first fold curve L15, and the like are inclined with respect to the center line 5A, but in the fourth embodiment, the side ruled line L11 and the like are formed substantially parallel to the center line 5A. ing. As described above, the outer end wall 30 and the like and the side ruled line L11 and the like are slightly different from those in the first embodiment, but their basic functions are the outer end wall 30 and the like and the side ruled line L11 and the like in the first embodiment. The description is omitted because it is the same as the above. Note that the outer end wall 30 and the like and the side ruled line L11 and the like according to the fourth embodiment may have the same shape as the outer end wall 30 and the like and the side ruled line L11 and the like according to the first embodiment.

  Each support wall 81 is generally formed in a substantially rectangular shape that is long in the stepwise direction. The stepwise dimension of each support wall 81 is set to be substantially the same as the stepwise dimension of the inner end wall 34. The dimension (projection dimension) of each support wall 81 in the flow direction is set longer than the dimension of the inner end wall 34 in the flow direction. Since the pair of support walls 81 are formed symmetrically in the flow direction with the inner end wall 34 interposed therebetween, one support wall 81 will be described below.

  The support wall 81 includes a main body wall 83, a contact wall 84, a fixed wall 85, and a diagonal wall 86. The main body wall 83 is provided so as to be continuous with the inner end wall 34 via the first fold curve L15, and has a second fold curve L41 extending parallel to the first fold curve L15. The contact wall 84 is provided so as to be continuous with the main body wall 83 via the third folding curve L42. The fixed wall 85 is provided so as to be continuous with the contact wall 84 via the fourth folding curve L43. The diagonal wall 86 is provided so as to be continuous with the fixed wall 85 via the fifth fold curve L44. The first to fifth bent curves L15 and L41 to L44 are formed parallel to each other and at substantially equal intervals. The first fold curve L15 is a lead rule, and the second to fifth fold curves L41 to L44 are general ruled lines.

  The diagonal wall 86 is formed in a substantially square shape wider in the flow direction than the contact wall 84 and the fixed wall 85. As will be described in detail later, the diagonal wall 86 is formed to have a width substantially equal to the diagonal line of the rectangular column 81A. Both ends in the step direction of the diagonal wall 86 are curved so as to protrude toward the outer end wall 30 (upward in an assembled state). In the assembled state, a curved concave portion 87 is formed at the lower end of the diagonal wall 86, and in the assembled state, the upper end of the diagonal wall 86 protrudes upward from the main body wall 83 (the contact wall 84 or the fixed wall 85). A projection 88 is formed. The amount of protrusion of the laminated protrusion 88 is substantially the same as the amount of depression of the curved concave portion 87.

[Connection process]
Next, a step of connecting the first to third blanks 4A, 4B, and 4C (a connecting step) will be described with reference to FIGS. FIG. 23 is a perspective view showing a state where the connecting step of the stacking trays 4 is completed. FIG. 24 is an enlarged perspective view showing the support wall 82 and the like.

<First step>
First, the operator forms the end wall 61 from the third blank 4C (first step). The worker attaches a double-sided tape (not shown) to the inner end wall 34 (around the inner end opening 34A) and attaches the inner end wall 34 (third edge 34B) to the two third folded lines L14. Along the outer end wall 30 side. Then, the inner end wall 34 is overlaid on the inner surface (the back liner 5C) of the outer end wall 30 and is adhered to the inner surface of the outer end wall 30 via a double-sided tape.

  Next, the worker applies a double-sided tape to the front liner 5B of the fixed wall 85 (or along the side ruled line L11 of the outer end wall 30). Subsequently, the operator bends the support wall 81 so as to be involved (see FIGS. 23 and 24). Specifically, the operator folds the diagonal wall 86 inward along the fifth fold curve L44, and folds the contact wall 84 inward along the third fold curve L42. Then, the fixed wall 85 is adhered to the inner surface of the outer end wall 30 via the double-sided tape, and the diagonal wall 86 is sandwiched between the main body wall 83 and the contact wall 84 and the like. The support wall 81 is in a state of being folded by the third fold curve L42 and the fifth fold curve L44 (see FIGS. 23 and 24).

  In addition, the worker attaches a double-sided tape to the distal end side (or the proximal end side) of the extension portion 82 and folds the distal end side of the extension portion 82 outward along the extended fold line L40 (see FIG. 23). The distal end of the extension 82 is adhered to the base end via a double-sided tape to form the extension 82 having a double laminated structure.

  As described above, the first step is completed, and the end wall body 61 in which two corrugated cardboard sheets are stacked is completed (see FIG. 23). The operator repeats the above-described first process to form two symmetrical end wall bodies 61.

<Second step>
Next, the operator connects the first blank 4A and the end wall 61 (second step). The worker attaches a double-sided tape to the back liner 5C of the substitute piece 80 of each end wall 61. Subsequently, the worker attaches the replacement piece 80 of the pair of end wall bodies 61 to the front liner 5B of the back wall 65 of the first blank 4A (see FIG. 24). The pair of passage pieces 80 are adhered to the left and right sides of the rear wall 65 with their tips aligned with the sticking marks M5 (see FIG. 23).

  As described above, the second step is completed, and the pair of end walls 61 are connected to the rear wall 65 (see FIG. 23).

<Third step>
Next, the operator connects the second blank 4B (upper bottom wall 60B) to the lower bottom wall 60A of the first blank 4A (third step). The worker applies a double-sided tape to the back liner 5C of the upper bottom wall 60B (or the lower bottom wall 60A). As shown in FIG. 23, the worker adheres the upper bottom wall 60B to the lower bottom wall 60A with the upper mark M6 of the upper bottom wall 60B aligned with the lower mark M1 of the lower bottom wall 60A. In this state, the upper bottom wall 60B is bonded to the lower bottom wall 60A via a double-sided tape with the pair of second missing portions 77A facing the pair of outer pieces 70. The front end (front edge) of the upper bottom wall 60B is separated from the side wall body 12 (first ruled line L1) backward. The four stacked holes 67 opened in the lower bottom wall 60A are located in the four column cutouts 76 of the upper bottom wall 60B.

  As described above, the third step is completed, and the bottom wall body 60 having a double laminated structure in which the lower bottom wall 60A and the upper bottom wall 60B are laminated is formed. This completes the connection step. In this state, the middle shin 5A of the lower bottom wall 60A and the middle shin 5A of the upper bottom wall 60B extend in directions orthogonal to each other. An engagement recess 25 is formed in a range surrounded by the upper surface of the lower bottom wall 60A and the front end of the upper bottom wall 60B. Further, a pair of second engagement concave portions 77 is formed in a range surrounded by the upper surface of the lower bottom wall 60A and the pair of second defective portions 77A. The pair of second engaging recesses 77 are formed so as to be recessed on both left and right sides of the upper surface of the bottom wall body 10.

  In addition, the attachment position of the double-sided tape in the connecting step described above may be appropriately changed, and an adhesive may be used instead of the double-sided tape.

[Assembly process]
Next, an assembling process of the stacking tray 4 will be described with reference to FIGS. FIG. 25 is a perspective view showing a process of assembling the end wall 61 and the like. FIG. 26 is an enlarged perspective view showing the support 81A and the like. FIG. 27 is a perspective view illustrating an assembly process of the stacking tray 4. Here, a case in which the worker performs the assembly process manually will be described.

  The stacking tray 4 is assembled by appropriately bending the connected first to third blanks 4A, 4B, 4C. As shown in FIG. 25, the operator bends the rear wall 65 upward along the first ruled line L <b> 1, and makes the rear wall 65 stand substantially vertically. Next, the operator bends the pair of left and right outer end walls 30 forward at substantially right angles along the lateral ruled line L11. The end wall 61 (outer end wall 30) is arranged in a standing position on the peripheral edge (short side) of the bottom wall 60.

  As shown in FIG. 24, as the outer end wall 30 is bent, the contact wall 84 of the rear support wall 81 is pressed against the rear wall 65 and bent at the fourth bending curve L43, and the main body wall 83 is bent. It is extruded inward while bending along the first folding curve L15 and breaking along the second folding curve L41 (see broken arrows in FIG. 24). Then, as shown in FIG. 26, the support wall 81 causes the main body wall 83 to valley fold at the first fold curve L15 and to fold at the second fold curve L41, and to make the contact wall 84 fold at the third fold curve L42. Then, the support 81A having a rectangular cross section is formed by being bent at the fourth bending curve L43. The column 81A is disposed in the column cutout 76 of the upper bottom wall 60B.

  The contact wall 84 overlaps the inner surface of the back wall 65 in a state where the contact wall 84 is bent at the third folding curve L42. The fixed wall 85 is fixed to the outer end wall 30 along the side ruled line L11 in a state where the contact wall 84 is mountain-folded along the third folding curve L42. The main body wall 83 is bent in a substantially L-shape at the second bending curve L41. The diagonal wall 86 is disposed so as to be bent at the fifth folding curve L44 and extend toward the third folding curve L42. That is, the diagonal wall 86 is disposed on a diagonal line of the rectangular cross section of the support column 81A. As described above, the support wall 81 is rolled up to form the rectangular column-shaped support 81A. The upper end surface of each support wall 81 (post 81A) is substantially flush with the uppermost end surfaces of the end wall 61 and the rear wall 65. In addition, the laminated projection 88 of each diagonal wall 86 protrudes upward from the upper end surface of the column 81A.

  Next, as shown in FIG. 25, the operator bends the pair of left and right outer pieces 70 upward at substantially right angles along the third ruled line L30. The outer piece 70 is provided to extend upward from the peripheral edge (short side) of the bottom wall 60 and overlaps the outer surface of the end wall 61 (outer end wall 30).

  Subsequently, the operator bends the pair of left and right frame portions 71 and the pair of left and right inner piece portions 72 along the two frame folding curves L31 so that the lower part of the end wall body 61 is involved. The frame part 71 penetrates each end opening 30A, 34A, and is arrange | positioned above the lower edge part of each end opening 30A, 34A. The inner piece 72 is folded downward with respect to the outer piece 70 to sandwich the lower portion of the end wall body 61 with the outer piece 70.

  Subsequently, the operator bends the pair of left and right second engagement protrusions 73 along the second fitting fold curve L32, and divides the pair of left and right second engagement protrusions 73 into the pair of left and right second protrusions. The engaging recess 77 is fitted. The second engaging projection 73 is bent substantially at right angles to the inner piece 72, and assumes a posture along the upper surface of the bottom wall body 60. The second engagement projection 73 fits into the second engagement recess 77 in a posture along the bottom wall body 60 in a state where the lower part of the end wall body 61 is sandwiched between the outer piece part 70 and the inner piece part 72. (Engage). The second engagement projection 73 forms a substantially same plane as the upper surface of the bottom wall body 60 (upper bottom wall 60B) in a state where the second engagement projection 73 is fitted in the second engagement recess 77.

  Subsequently, as shown in FIG. 27, the operator bends the pair of left and right outer edge walls 31 substantially inward at a right angle along the side ruled line L11. The outer edge wall 31 and the extension 82 are provided so as to extend from the side end of the outer end wall 30 toward the side wall 12. As the outer edge wall 31 is bent, the contact wall 84 of the front support wall 81 is pushed out by the outer edge wall 31 and is bent at the fourth folding curve L43, and the main body wall 83 is bent at the first folding curve L15. In addition, it is pushed inward while breaking at the second folding curve L41. The front support wall 81 forms a column 81A having a rectangular cross section, like the rear support wall 81. The diagonal wall 86 is arranged on a diagonal line of a rectangular cross section of the column 81A.

  Subsequently, the operator bends the pair of left and right second extension portions 74 inward at substantially right angles along the extension fold curve L33. The second extension 74 overlaps the outer surface of the extension 82 and is provided so as to extend toward the side wall 12.

  Next, as shown in FIG. 20, the operator bends the outer plate portion 20 upward at a substantially right angle along the first ruled line L <b> 1 to form the upper plate edge portion 21 and the inner plate portion 22 into two second plates. Fold along the ruled line L2. Then, the second extension portion 74 is sandwiched between the outer plate portion 20 and the inner plate portion 22 together with the extension portion 82. Subsequently, the worker bends the engaging protrusion 23 along the fitting fold curve L3 to fit the engaging recess 25 (see FIG. 9 and the like).

  Thus, the assembly work of the stacking tray 4 is completed (see FIG. 20). In this state, the center shin 5A of the end wall 61 and the like extends in the up-down direction.

[Lamination action]
Next, the stacking operation of the stacking tray 4 will be briefly described. The stacking operation of the stacking tray 4 is substantially the same as the stacking operation of the stacking tray 1 according to the first embodiment, and the bottom wall 60 of the upper stacking tray 4 is mounted on the four columns 81A of the lower stacking tray 4. By being placed, a plurality of stacking trays 4 are stacked. When a plurality of stacking trays 4 are stacked, the four stacking projections 88 of the lower stacking tray 4 are inserted from below into the stacking holes 67 of the upper stacking tray 4 (not shown). The distal end surface of the laminated projection 88 penetrates the laminated hole 67 and abuts on the lower end surface of the curved concave portion 87 (not shown).

  In the stacking tray 4 according to the fourth embodiment described above, the second engagement protrusion 73 is held in a posture substantially parallel to the bottom wall body 60 with the lower portion of the end wall body 61 sandwiched therebetween. It is configured to fit (engage) with the recess 77 (see FIG. 20). According to this configuration, when a force for tilting the end wall 61 outward is applied, the end piece 66 is rotated outward so that the end piece 66 is deployed, and the tip of the second engagement projection 73 is moved to the second position. (The cross section of the second defective portion 77A). This makes it difficult for the second engagement projection 73 to come off from the second engagement recess 77, thereby preventing the end piece 66 from being deployed. Thus, the state in which the end piece 66 sandwiches the end wall 61 can be maintained, and the standing posture of the end wall 61 can be maintained. As described above, in addition to the engaging action between the engaging projection 23 and the engaging recess 25, the engaging action between the second engaging projection 73 and the second engaging recess 77 is added. The effect of maintaining the assembled state of No. 4 can be improved.

  Further, in the stacking tray 4 according to the fourth embodiment, the second extension 74 is sandwiched together with the extension 82 in the side wall 12 having the double wall structure. According to this configuration, when a force is exerted to push the end wall 61 outward, the second extension 74 lifts the side wall 12 and pivots outward so that the side wall 12 is deployed. Then, in addition to the tip of the second engagement projection 73 abutting on the inner surface of the second engagement recess 77, the tip of the engagement projection 23 abuts on the inner surface of the engagement recess 25. Thereby, the force for tilting the end wall 61 outward can be dispersed, and as a result, the assembled state of the stacking tray 4 can be maintained.

  Further, in the stacking tray 4 according to the fourth embodiment, the stacking projections 88 protrude upward from the upper end surfaces of the columns 81A, and the stacking holes 67 are opened in the bottom wall body 60. According to this configuration, when a plurality of stacking trays 4 are stacked, the stacking projections 88 of the lower stacking tray 4 are inserted into the stacking holes 67 of the upper stacking tray 4. The displacement in the direction can be suppressed. Thereby, the state in which the plurality of stacking trays 4 are stacked can be appropriately maintained. In addition, since the stacked projections 88 are arranged inside the support columns 81A, it is possible to prevent the stacked projections 88 from interfering with products or the like placed on the bottom wall body 60.

  In the stacking tray 4 according to the fourth embodiment, the second engaging projection 73 and the second engaging recess 77 are formed in a substantially square shape, but the present invention is not limited to this. For example, the second engagement projection 73 and the second engagement recess 77 are substantially the same as the engagement projection 23 and the engagement recess 25 of the stacking trays 1 to 3 according to the first to third embodiments. It may be formed in a trapezoidal shape (see FIGS. 6 and 18A), or may be formed in an uneven shape (see FIG. 18B) or a triangular shape (not shown). Also, the size (length) and number of the second engagement projection 73 and the second engagement recess 77 can be changed as appropriate (see FIGS. 19A and 19B).

  In the stacking tray 4 according to the fourth embodiment, the lower portion of the end wall body 61 is sandwiched between the inner piece 72 and the outer piece 70, but the present invention is not limited to this. The inner piece 72 and the outer piece 70 may sandwich at least a part of the end wall 61, and may be formed so as to sandwich the entire end wall 61, for example.

  Further, in the stacking tray 4 according to the fourth embodiment, the second extension 74 is provided continuously with the outer piece 70 of the end piece 66. However, the present invention is not limited to this, and the second extension 74 is omitted. May be done. In this case, the outer piece 70 may be formed to have the same width as the inner piece 72 and the like.

  In addition, in the stacking tray 4 according to the fourth embodiment, the stacked protrusions 88 have a curved convex shape, but the present invention is not limited to this. The size and shape of the laminated projection 88 can be changed as appropriate. In the stacking tray 4, four stacked protrusions 88 are formed. However, the present invention is not limited to this. For example, a pair of stacked protrusions 88 may be formed on a pair of diagonal support walls 81. Further, the lamination holes 67 may be formed in accordance with the shape and number of the lamination protrusions 88.

  Further, in the stacking tray 4 according to the fourth embodiment, the stacked projections 88 (diagonal walls 86) are arranged on a diagonal line of the column 81A, but the present invention is not limited to this. For example, the diagonal wall 86 may be omitted, and the laminated protrusion may be provided to project from the upper end of the main body wall 83 (not shown). Further, in the stacking trays 1 to 3 according to the first to third embodiments, the support wall 35 (the support 35A) is formed with a laminated protrusion (not shown) projecting upward from the upper end, and the bottom wall is formed. The stacking holes 10 (not shown) into which the stacking protrusions of the lower stacking trays 1 to 3 are inserted when a plurality of stacking trays 1 to 3 are stacked may be formed in the stacks 10 and 50.

  In the stacking tray 4 according to the fourth embodiment, the stacking holes 67 are formed only in the lower bottom wall 60A, but the present invention is not limited to this. For example, the column notch 76 may be omitted from the upper bottom wall 60B, and the laminated holes 67 may be formed in the lower bottom wall 60A and the upper bottom wall 60B.

  In the stacking trays 1 to 4 according to the first to fourth embodiments, the engaging concave portions 25 (the defective portions 25A) are formed to have substantially the same shape as the engaging convex portions 23. Is not limited to this. For example, the engaging protrusion 23 may be formed slightly smaller than the engaging recess 25 (not shown). That is, the projecting dimension of the engaging projection 23 may be set to be shorter than the front-rear width (depth of the notch) of the engaging recess 25 (defective portion 25A). In this case, in a state where the engaging protrusion 23 is engaged (disposed) with the engaging recess 25, the gap between the tip of the engaging protrusion 23 and the inner surface of the engaging recess 25 (the cross section of the defective portion 25 </ b> A) is formed. A slight gap will be formed. It is preferable that this gap is such that the tip of the engaging projection 23 can be abutted against the inner surface of the engaging recess 25 when the side wall body 12 is rotated to expand. Similarly to the above, in the stacking tray 4 according to the fourth embodiment, the second engaging projection 73 may be formed slightly smaller than the second engaging recess 77 (not shown). .

  Further, in the stacking trays 1 to 4 according to the first to fourth embodiments, the support walls 35, 81 are continuous with the end walls 11, 51, 61, but the present invention is not limited to this. For example, the support walls 35, 81 may be formed of separate members separated from the end wall bodies 11, 51, 61. In this case, it is preferable that the support walls 35, 81 are bent to form the prismatic columns 35A, 81A, and then the columns 35A, 81A are bonded to the end walls 11, 51, 61 and the like.

  In the stacking trays 1 to 4 according to the first to fourth embodiments, four columns 35A, 81A (four support walls 35, 81) are formed, but the present invention is not limited to this. For example, it is preferable that three or more columns 35A and 81A are provided in order to stably support the upper stacking trays 1 to 4. Further, for example, when the pillars 35A, 81A are formed in a wall shape, and the upper end surfaces of the pillars 35A, 81A can be made wide (large), the number of the pillars 35A, 81A may be two. Further, the columns 35A and 81A are formed in a rectangular tube shape having a substantially rectangular cross section, but the present invention is not limited to this. For example, it may be formed in a rectangular tube shape having a triangular or pentagonal or more polygonal cross section, or may be formed in a cylindrical shape having a substantially circular (elliptical) cross section (not shown).

  Further, in the stacking trays 1 to 4 according to the first to fourth embodiments, the end walls 11, 51, and 61 are formed higher than the side wall 12, but the present invention is not limited thereto. They may be formed at substantially the same height. Further, in the stacking trays 1 to 3 according to the first to third embodiments, the upper end surface of the column 35A is provided below the upper end surface of the inner end wall 34 or the like. However, the present invention is not limited to this. It may be formed at substantially the same position as the upper end surface of the end wall 34 or the like. Further, in the stacking tray 4 according to the fourth embodiment, the upper end surface of the support column 81A is formed at substantially the same position as the upper end surface of the end wall body 61, but is not limited thereto. It may be provided below the end face.

  In the stacking trays 1 to 3 according to the first to third embodiments, the side edges (the lateral ruled line L11, the first fold curve L15, and the like) of the outer end wall 30 and the inner end wall 34 are centered 5A ( (The line extending perpendicularly to the lower ruled line L10) is inclined outward by about 1 degree. However, the present invention is not limited thereto, and this angle may be appropriately changed according to, for example, the height of the end wall body 11 or the like. Good. Further, for example, when the upper end surface of the support 35A is formed substantially in the same plane as the upper end surface of the inner end wall 34 or the like, the end wall 11 (the outer end wall 30 and the inner end wall 34) is pinched. When viewed from the surface side, it may be formed in a rectangular shape having substantially the same width from below to above, or a substantially trapezoidal shape gradually narrowing from below to above. Further, the side edge of the end wall 61 of the stacking tray 4 according to the fourth embodiment may be inclined outward.

  In the stacking trays 1 to 4 according to the first to fourth embodiments, the bottom walls 10, 50, 60 are formed in a substantially rectangular shape, and the pair of end walls 11, 51, 61 and the pair of side walls 12 are formed. Are arranged at substantially 90 degrees apart from each other in the circumferential direction, but the present invention is not limited to this. For example, the bottom wall bodies 10, 50, 60 may be formed in a polygonal shape other than a rectangle, such as a triangle, a pentagon, or a hexagon, or in a circular shape (an elliptical shape) (not shown). Also in this case, it is preferable that the end wall bodies 11, 51, 61 and the side wall body 12 are arranged on the peripheral edge of the bottom wall bodies 10, 50, 60 so as to be adjacent to each other.

  In addition, the stacking trays 1 to 4 according to the first to fourth embodiments (excluding the modified example of the third embodiment) are formed of double-faced cardboard made of paper, but are not limited thereto. It may be formed of a cardboard sheet made of paper, such as a double-sided double-sided cardboard, a double-sided double-sided cardboard, cardboard, or various cardboard sheets made of resin.

  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.

1-4 Stacking tray (packing box)
5A Nakashin 5B Front liner (Liner)
5C back liner (liner)
10, 50, 60 Bottom wall body 10A, 50A, 60A Lower bottom wall 10B, 40B, 50B, 60B Upper bottom wall 10C, 40C Intermediate bottom wall 11, 51, 61 End wall body 12 Side wall body 20 Outer plate part 22 Inner plate Part 23 Engagement convex part 24 Engagement piece part 25 Engagement concave part 25A Missing part 30 Outer end wall 31 Outer edge wall 32 First folded wall 33 Second folded wall 34 Inner end wall 35, 81 Support wall 35A, 81A Column 36 Inner edge Wall 37, 82 Extension 37A Outside extension (extension)
37B Inside extension (extension)
38 Engaging groove 66 End piece 67 Stacking hole 70 Outer piece 72 Inner piece 73 Second engaging projection 74 Second extension 77 Second engaging recess 83 Body wall 84 Contact wall 85 Fixed wall 86 Diagonal wall 88 Stacked protrusion L12 First fold line L13, L41 Second fold line L14, L42 Third fold line L15 First fold curve L16 Second fold curve L17 Third fold curve L43 Fourth fold curve L44 Fifth fold curve

Claims (12)

A plurality of packaging boxes (1 to 4) which can be stacked vertically,
A bottom wall body (10, 50, 60) including an engagement recess (25) formed in a concave state on the surface;
An end wall (11, 51, 61) arranged in an upright posture on a peripheral portion of the bottom wall;
A side wall body (12) arranged in an upright position on a peripheral edge of the bottom wall body at a position adjacent to the end wall body and shifted from the end wall body in a circumferential direction;
The end wall body,
A support wall (35, 81) provided in a state protruding inward;
An extension (37, 82) provided so as to extend toward the side wall body;
The side wall body,
An outer plate portion (20) provided to extend upward from a peripheral portion of the bottom wall;
An inner plate portion (22) folded downward so as to cover the upper portion of the extension portion with respect to the outer plate portion and sandwiching the extension portion with the outer plate portion;
The inner plate portion is provided so as to be continuous with the distal end portion, and engages with the engagement recess in a posture along the bottom wall in a state where the extension portion is sandwiched between the outer plate portion and the inner plate portion. A packaging box, comprising:   An engagement piece portion is provided at a side end of the inner plate portion to engage with an engagement groove (38) formed in the end wall in a state where the engagement protrusion is engaged with the engagement recess. The packaging box according to claim 1, wherein (24) is formed. The packaging box is formed of a corrugated cardboard sheet in which a liner (5B, 5C) is bonded to a middle lining (5A),
The bottom wall,
A lower bottom wall (10A, 50A) formed so as to be continuous with the outer plate portion;
An upper bottom wall (10B, 40B, 50B) which is formed separately from the lower bottom wall, is disposed above the lower bottom wall, and has a defective portion (25A) forming the engaging recess; , Including
3. The packaging box according to claim 1, wherein the inner bottom of the lower bottom wall and the inner bottom of the upper bottom wall extend in directions intersecting each other. 4. The bottom wall further includes an intermediate bottom wall (10C, 40C) formed to be continuous with the end wall,
The intermediate bottom wall is formed separately from the lower bottom wall and the upper bottom wall, and is fixed while being sandwiched between the lower bottom wall and the upper bottom wall. Item 4. The packaging box according to Item 3. The packaging box is formed of a corrugated cardboard sheet in which a liner (5B, 5C) is bonded to a middle lining (5A),
The packaging box according to any one of claims 1 to 4, wherein the inner sash of each of the end wall, the outer plate portion, and the inner plate portion extends vertically. An upper end surface of the support wall is provided below an uppermost end surface of the end wall body,
The packaging box according to any one of claims 1 to 5, wherein the end wall (11, 51) is formed so as to gradually increase in width from below to above. The end wall body,
An outer end wall (30) arranged in an upright posture on a peripheral portion of the bottom wall body;
An outer edge wall (31) provided to extend from the side end of the outer end wall toward the side wall body;
An inner end wall (34) superimposed on the inner surface of the outer end wall;
An inner edge wall (36) overlapping the inner surface of the outer edge wall.
The extension is provided in a state of being connected to at least one end of the outer edge wall and the inner edge wall,
The support wall is provided in a state where it is connected to the inner end wall via a first fold curve (L15) and in a state where it is connected to the inner edge wall via a second fold curve (L16). A third fold curve (L17) extending parallel to the first fold curve and the second fold curve between the curve and the second fold curve;
The support wall has a valley fold at the first fold curve by bending the inner edge wall at the valley curve at the second fold curve, and also has a rectangular cross-section at which the third fold curve is bent inward while being pushed inward. The packaging box according to any one of claims 1 to 6, wherein the packaging box (35A) is formed. The end wall body,
A first folded wall (32) provided in a state of being connected to a side end of the outer edge wall via a first folded line (L12);
A second folded wall (33) provided in a state of being connected to an upper end of the outer edge wall via a second folded line (L13),
The inner end wall is provided so as to be continuous with an upper end portion of the outer end wall via a third folded line (L14), and is folded inward along the third folded line to form an inner end wall of the outer end wall. Layered on the inside,
The first folded wall is overlapped and fixed to the inner edge wall overlapping the inner surface of the outer edge wall in a state of being folded inward along the first folded line,
8. The packaging box according to claim 7, wherein the second folded wall overlaps and is fixed to an inner surface of the outer edge wall in a state where the second folded wall is folded inward along the second folded line. 9. An end piece (66) provided so as to be continuous with a peripheral portion of the bottom wall on which the end wall (61) is arranged;
A second engagement recess (77) is formed on the surface of the bottom wall on the side of the end wall, in a recessed state,
The end piece,
An outer piece (70) provided to extend upward from a peripheral edge of the bottom wall and overlapping an outer surface of the end wall;
An inner piece (72) folded downward with respect to the outer piece and sandwiching at least a part of the end wall body with the outer piece;
The second piece is provided in a state of being connected to the tip of the inner piece, and is positioned along the bottom wall in a state where at least a part of the end wall is sandwiched between the outer piece and the inner piece. The packaging box according to any one of claims 1 to 6, further comprising a second engagement projection (73) engaged with the second engagement recess. A second extension portion (74) is provided at a side end portion of the outer piece portion in a continuous state,
10. The packaging box according to claim 9, wherein the second extension is sandwiched between the outer plate and the inner plate together with the extension in a state of extending toward the side wall. On the support wall, a laminated projection (88) projecting upward from the upper end is formed,
The stacking hole (67) into which the stacking protrusion of the packaging box below is inserted when a plurality of packaging boxes are stacked is formed in the bottom wall body. Packaging box described in any of them. The end wall body,
An outer end wall (30) arranged in an upright posture on a peripheral portion of the bottom wall body;
An outer edge wall (31) connected to a side end of the outer end wall via a lateral ruled line (L11) and provided from the side end of the outer end wall toward the side wall body;
An inner end wall (34) overlapping the inner surface of the outer end wall.
The extension portion is provided in a state of being connected to a tip portion of the outer edge wall,
The support wall (81)
A main body wall (83) provided in a state of being connected to the inner end wall via a first fold curve (L15) and having a second fold curve (L41) extending in parallel with the first fold curve; ,
A contact wall (84) connected to the main body wall via a third fold curve (L42);
The contact wall is provided so as to be continuous with a fourth fold curve (L43) via the fourth fold curve (L43), and is fixed to the outer end wall along the side ruled line while the contact wall is mountain-folded at the third fold curve. Fixed wall (85),
A diagonal wall (86) provided in a state of being connected to the fixed wall via a fifth fold curve (L44) and having a laminated projection (88) protruding upward from the main body wall. ,
The support wall causes the main body wall to valley fold at the first fold curve and the mountain fold at the second fold curve, and the contact wall to fold at the third fold curve and valley at a fourth fold curve. To form a column (81A) having a rectangular cross section,
The diagonal wall is disposed so as to be mountain-folded along the fifth fold curve and extend toward the third fold curve,
The stacked projections project above the upper end surface of the support,
The bottom wall is provided with a stacking hole (67) into which the stacking protrusion of the lower packaging box is inserted when a plurality of packaging boxes are stacked. The packaging box according to any one of claims 9 to 10.

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