CN110431082B - Packing case (food) - Google Patents

Abstract

The invention provides a packing box for maintaining the state that a side wall body clamps an extension part. A plurality of stacking trays (1) (packing boxes) capable of being stacked up and down are provided; a bottom wall body (10) including an engaging recess formed in a recessed state on a surface thereof; an end wall body (11) which is arranged at the peripheral edge part of the bottom wall body (10) in a standing posture; and a side wall body (12) disposed in a standing posture at a peripheral edge portion of the bottom wall body (10) at a position adjacent to the end wall body (11), wherein the end wall body (11) includes: a support wall (35) provided in a state of protruding inward; and an extension portion provided in a state of extending toward the side wall body (12), wherein the side wall body (12) includes: an outer plate (20) which is provided in a state of extending upward from the peripheral edge of the bottom wall body (10); an inner plate section (22) which is folded downward so as to cover the upper side of the extension section and which sandwiches the extension section with the outer plate section (20); and an engaging convex portion (23) which is provided in a state of being connected to the front end portion of the inner plate portion (22) and is engaged with the engaging concave portion in a posture along the bottom wall body (10).

Description

Packing case (food)

Technical Field

The invention relates to a packaging box.

Background

There is known a packaging box which accommodates an object to be packaged and can stack a plurality of objects one upon another.

For example, a package disclosed in patent document 1 includes: a rectangular bottom wall; a pair of end walls provided on the short sides of the bottom wall in a standing posture; and a pair of side walls provided on the long sides of the bottom wall in a standing posture. An inner wall is fixed to the inner surface of the end wall, and insertion locking parts are arranged at the lower parts of the two sides of the end wall and the inner wall. On the inner wall, reinforcing walls are provided, which, when the box is assembled, constitute pillars of triangular section. The side wall is formed into a double-wall structure by an outer plate portion and an inner plate portion, and an insertion locking portion is sandwiched between the outer plate portion and the inner plate portion and fixed. The top end of the inner plate portion is formed with a locking projection which is locked with a locking hole portion opened in the bottom wall.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open publication No. 5782577

Disclosure of Invention

[ technical problem to be solved by the invention ]

For example, when a plurality of packing boxes each containing a heavy product or the like are stacked, a force that causes the end wall to tilt outward acts on the lower packing box receiving the load. When the end wall is tilted outward, the distal end portion of the insertion locking portion inserted into the side wall is rotated upward, and therefore the side wall may be lifted and the locking convex portion may be disengaged from the locking hole portion. Therefore, the side wall of the lower package box may be unfolded (disassembled), and the state of holding the insertion locking portion may not be maintained.

In order to solve the above-mentioned problems, the present invention provides a packaging box that maintains a state in which an extension is held by a side wall.

[ technical means for solving problems ]

In order to achieve the above object, the present invention provides a package box capable of stacking a plurality of package boxes one on top of another, the package box comprising: the bottom wall body comprises a clamping concave part which is formed in a concave state on the surface; the end wall body is arranged at the peripheral edge part of the bottom wall body in a standing posture; the side wall body is offset in the circumferential direction with respect to the end wall body, and is arranged at the peripheral edge portion of the bottom wall body in a standing posture at a position adjacent to the end wall body, the end wall body includes a support wall and an extension portion, wherein the support wall is provided in a state of protruding inward; the extension portion is provided in a state of extending toward the sidewall body; the side wall body includes an outer plate portion, an inner plate portion, and an engaging convex portion, wherein the outer plate portion is provided in a state of extending upward from a peripheral edge portion of the bottom wall body; the inner plate portion is folded downward with respect to the outer plate portion so as to cover an upper portion of the extension portion, and the extension portion is sandwiched between the inner plate portion and the outer plate portion; the engaging convex portion is provided in a state of being connected to a distal end portion of the inner plate portion, and is engaged with the engaging concave portion in a posture along the bottom wall body in a state of sandwiching the extension portion between the outer plate portion and the inner plate portion.

Preferably: in this case, an engagement piece portion is formed at a side end portion of the inner plate portion, and the engagement piece portion is engaged with an engagement groove formed in the end wall body in a state where the engagement convex portion is engaged with the engagement concave portion.

Preferably: in this case, the packing box is formed of a corrugated cardboard in which a liner paper is stuck to a corrugated cardboard, and the bottom wall body includes a lower bottom wall and an upper bottom wall, wherein the lower bottom wall is formed in a state of being connected to the outer panel portion; the upper bottom wall and the lower bottom wall are formed separately, are arranged above the lower bottom wall, and are formed with notch portions constituting the engagement recesses, and the corrugated paper of the lower bottom wall and the corrugated paper of the upper bottom wall extend in directions intersecting each other.

Preferably: in this case, the bottom wall body further includes an intermediate bottom wall formed in a state of being connected to the end wall body, the intermediate bottom wall being formed separately from the lower bottom wall and the upper bottom wall so as to be fixed in a state of being sandwiched between the lower bottom wall and the upper bottom wall.

Preferably: in this case, the packing box is formed by pasting a corrugated cardboard formed by a liner paper on a corrugated paper, and the end wall body, the outer plate portion, and the inner plate portion each extend in the up-down direction of the corrugated paper.

Preferably: in this case, the upper end surface of the support wall is provided below the uppermost end surface of the end wall body, and the width of the end wall body is formed so as to gradually increase from below to above.

Preferably: in this case, the end wall body further includes an outer end wall, an outer edge wall, an inner end wall, and an inner edge wall, wherein the outer end wall is disposed in a standing posture at a peripheral portion of the bottom wall body; the outer edge wall is provided in a state of extending from a side end portion of the outer end wall toward the side wall body; the inner end wall is overlapped with an inner surface of the outer end wall; the inner edge wall is overlapped on an inner surface of the outer edge wall, the extension portion is connected to a distal end portion of at least one of the outer edge wall and the inner edge wall, the support wall is connected to the inner edge wall by a first bending line and connected to the inner edge wall by a second bending line, and includes a third bending line extending in parallel to the first bending line and the second bending line between the first bending line and the second bending line, the support wall is concavely bent by the second bending line to be concavely bent by the first bending line, and the third bending line is convexly bent while being pushed inward, thereby forming a pillar having a rectangular cross section.

Preferably: in this case, the end wall body further includes a first folded-back wall and a second folded-back wall, the first folded-back wall is set in a state of being connected to the side end portion of the outer edge wall through a first folded-back line, the second folded-back wall is set in a state of being connected to the upper end portion of the outer edge wall through a second folded-back line, the inner end wall is set in a state of being connected to the upper end portion of the outer end wall through a third folded-back line, the inner end wall is overlapped on the inner surface of the outer end wall by being folded back to the inside along the third folded-back line, the first folded-back wall is overlapped and fixed to the inner edge wall overlapped on the inner surface of the outer edge wall in a state of being folded back to the inside along the first folded-back line, and the second folded-back wall is overlapped and fixed to the inner surface of the outer edge.

Preferably: in this case, the end plate body has a state of being connected to a peripheral portion of the bottom wall body on which the end wall body is disposed, and a second engaging concave portion is formed in a recessed state on a surface of the bottom wall body on the side of the end wall body, and the end plate body includes an outer plate portion, an inner plate portion, and a second engaging convex portion, wherein the outer plate portion is provided in a state of extending upward from the peripheral portion of the bottom wall body and is overlapped with an outer surface of the end wall body; the inner sheet portion is folded downward relative to the outer sheet portion, and at least a part of the end wall body is sandwiched between the inner sheet portion and the outer sheet portion; the second engaging convex portion is provided in a state of being connected to a distal end portion of the inner piece portion, and is engaged with the second engaging concave portion in a posture along the bottom wall body in a state of sandwiching at least a part of the end wall body by the outer piece portion and the inner piece portion.

Preferably: in this case, a second extension portion is provided at the side end portion of the outer piece portion so as to be connected thereto, and the second extension portion is sandwiched between the outer plate portion and the inner plate portion together with the extension portion in a state of extending toward the side wall body.

Preferably: in this case, a stacking projection projecting upward from an upper end portion is formed on the support wall, and a stacking hole into which the stacking projection of the lower packaging box is inserted when a plurality of packaging boxes are stacked is formed on the bottom wall.

In addition, it is preferable that: in this case, the end wall body further includes an outer end wall, an outer edge wall, and an inner end wall, wherein the outer end wall is disposed at a peripheral portion of the bottom wall body in a standing posture; the outer edge wall is connected to the side end portion of the outer end wall by a side folding line, and is provided in a state of extending from the side end portion of the outer end wall toward the side wall body; the inner end wall is overlapped with the inner surface of the outer end wall, the extension part is arranged in a state of being connected with the top end part of the outer edge wall, and the supporting wall comprises a main body wall, a contact wall, a fixed wall and a diagonal wall, wherein the main body wall is arranged in a state of being connected with the inner end wall through a first bending line and is provided with a second bending line extending in parallel with the first bending line; the contact wall is arranged in a state of being connected with the main body wall through a third bending line; the fixing wall is provided in a state of being connected to the contact wall by a fourth fold line, and is fixed to the outer end wall along the side fold line in a state of being convexly folded by the third fold line; the diagonal wall is provided in a state of being connected to the fixed wall by a fifth bending line, and has a lamination protrusion protruding upward of the main body wall, the support wall forms a pillar having a rectangular cross section by concavely folding the main body wall at the first bending line and convexly folding the main body wall at the second bending line, and the contact wall is convexly folded at the third bending line and convexly folded at a fourth bending line, the diagonal wall is arranged in a state of convexly folding the fifth bending line and extending toward the third bending line, the lamination protrusion protrudes upward of an upper end face of the pillar, and a lamination hole into which the lamination protrusion of the lower packaging box is inserted is formed in the bottom wall when a plurality of packaging boxes are laminated.

[ Effect of the invention ]

According to the present invention, the state in which the extension portion is sandwiched by the side wall body can be maintained.

Drawings

Fig. 1 is a perspective view showing a stacking tray (stacking tray) according to a first embodiment of the present invention.

Fig. 2 is a plan view showing a first blank (blank) and a second blank of a stack tray according to a first embodiment of the present invention.

Fig. 3 is a plan view showing a third blank of the stacking tray according to the first embodiment of the present invention.

Fig. 4 is a perspective view showing a state of an end wall body and the like of the stack tray according to the first embodiment of the present invention in the course of the first step.

Fig. 5 is an exploded perspective view showing a stack tray according to a first embodiment of the present invention.

Fig. 6 is a plan view showing a state after the end of the process of connecting the stack tray according to the first embodiment of the present invention.

Fig. 7 is a perspective view illustrating an assembly process of the stack tray according to the first embodiment of the present invention.

Fig. 8 is an enlarged perspective view of a column or the like of the stack tray according to the first embodiment of the present invention.

Fig. 9 is a cross-sectional view IX-IX of fig. 1.

Fig. 10 is an enlarged perspective view of an engagement piece portion and the like of the stack tray according to the first embodiment of the present invention.

Fig. 11 is a perspective view showing a stacked state of the stack trays according to the first embodiment of the present invention.

Fig. 12 is a perspective view illustrating a stacking function of the stack tray according to the first embodiment of the present invention.

Fig. 13 is a plan view showing a first blank and a second blank of a stacking tray according to a second embodiment of the present invention.

Fig. 14 is a plan view showing a third blank of the stacking tray according to the second embodiment of the present invention.

Fig. 15 is a plan view showing a state where the first blank and the third blank of the stacking tray according to the second embodiment of the present invention are coupled to each other.

Fig. 16 is a sectional view illustrating a connection step (third step) of the stack tray according to the second embodiment of the present invention.

Fig. 17 is a plan view showing a first blank and a second blank of a stacking tray according to a third embodiment of the present invention.

Fig. 18A is a plan view showing the engaging convex portion and the engaging concave portion of the stack tray according to the first modification of the first to third embodiments of the present invention.

Fig. 18B is a plan view showing the engaging convex portion and the engaging concave portion of the stack tray according to the second modification of the first to third embodiments of the present invention.

Fig. 19A is a plan view showing the engaging convex portion and the engaging concave portion of the stack tray according to the third modification of the first to third embodiments of the present invention.

Fig. 19B is a plan view showing the engaging convex portion and the engaging concave portion of the stack tray according to the fourth modification of the first to third embodiments of the present invention.

Fig. 20 is a perspective view showing a stack tray according to a fourth embodiment of the present invention.

Fig. 21 is a plan view showing a first blank and a second blank of a stacking tray according to a fourth embodiment of the present invention.

Fig. 22 is a plan view showing a third blank of the stacking tray according to the fourth embodiment of the present invention.

Fig. 23 is a perspective view showing a state where the process of connecting the stack trays according to the fourth embodiment of the present invention is completed.

Fig. 24 is an enlarged perspective view of a support wall and the like of a stack tray according to a fourth embodiment of the present invention.

Fig. 25 is a perspective view showing an assembly process of an end wall body and the like of the stack tray according to the fourth embodiment of the present invention.

Fig. 26 is an enlarged perspective view of a column or the like of a stack tray according to a fourth embodiment of the present invention.

Fig. 27 is a perspective view illustrating an assembly process of the stack tray according to the fourth embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. In addition, "Fr" shown in each drawing represents "front", "Rr" represents "rear", "L" represents "left", "R" represents "right", "U" represents "upper", and "D" represents "lower". These directional terms are used for convenience of description, and do not limit the technical scope of the present invention.

[ first embodiment ]

Referring to fig. 1 to 3, a stack tray 1 as an example of a package box according to a first embodiment will be described. Fig. 1 is a perspective view showing a stack tray 1. Fig. 2 is a plan view showing the first blank 1A and the second blank 1B of the stacking tray 1. Fig. 3 is a plan view showing the third blank 1C of the stacking tray 1.

[ outline of Stacking tray ]

As shown in fig. 1, the stack tray 1 has an opening 13 continuous from the upper surface to both the front and rear surfaces, and is formed in a substantially rectangular parallelepiped shape. The stack tray 1 is formed so that a plurality of objects to be packed (not shown) such as commodities can be stacked vertically on the bottom wall 10. Four pillars 35A extending in the vertical direction are provided at four corners of the inner side of the stacking tray 1. Each of the support columns 35A abuts against the bottom wall 10 of the stacked tray 1 stacked above to support the stacked tray 1 above.

The stack tray 1 includes a pair of end walls 11 and a pair of side walls 12 arranged in a standing posture at the peripheral edge of the bottom wall 10. The bottom wall 10 is formed in a substantially rectangular shape that is long in the left-right direction when viewed in plan. As will be described in detail later, the bottom wall 10 is formed by stacking 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 face each other in the left-right direction across the bottom wall 10, and the pair of side walls 12 face each other in the front-rear direction across the bottom wall 10. That is, the side wall 12 is offset by substantially 90 degrees in the circumferential direction with respect to the end wall 11 and is disposed adjacent to the end wall 11 in a standing posture. The end wall 11 is formed higher (vertically longer) than the side wall 12.

The stack tray 1 is formed by joining and assembling the first blank 1A, the second blank 1B, and the third blank 1C shown in fig. 2 and 3. The first blank plate 1A, the second blank plate 1B, and the third blank plate 1C are each formed by punching a sheet of corrugated cardboard by a die cutter or the like. The corrugated cardboard is, for example, double-faced corrugated cardboard in which a front paper 5B and a back paper 5C (see fig. 4) are bonded to the front and back surfaces of corrugated cardboard 5A. Fig. 2 and 3 show the face paper 5B side. In the present specification, a direction (paper width direction) parallel to the corrugated paper 5A of the corrugated cardboard is referred to as a "corrugation direction", and a direction perpendicular to the corrugation direction is referred to as a "corrugation direction". In the drawings, "X" indicates a "corrugation direction" and "Y" indicates a "corrugation 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 in a state of being connected to the pair of side walls 12 (outer panel portions 20). Since the pair of side wall bodies 12 are formed substantially symmetrically in the corrugation direction with the lower bottom wall 10A interposed therebetween, description will be given below of one (right side in fig. 2) side wall body 12.

< lower bottom wall >

The lower bottom wall 10A is formed in a substantially rectangular shape that is long in the corrugation direction. In the center in the corrugation direction of the lower bottom wall 10A, a lower side mark M1 is formed at the center in the corrugation direction and both end portions of the lower bottom wall 10A. Further, lower marks M1 are also formed at the four corners of the lower bottom wall 10A. The lower marker M1 is formed by a cutting line that causes a cutter to penetrate through the thickness direction of the corrugated cardboard.

< sidewall body >

The side wall 12 includes an outer plate 20, an upper plate edge 21, an inner plate 22, and an engaging projection 23. The outer plate portion 20 is connected to one end of the lower bottom wall 10A in the corrugation direction by a first broken line L1. The inner panel portion 22 is connected to the side end portion (distal end portion) of the outer panel portion 20 by two second fold lines L2. Between the two second fold lines L2, the upper panel edge portion 21 is formed. The engaging convex portion 23 is provided in a state of being connected to the side end portion (distal end portion) of the inner plate portion 22 by the fitting bending line L3. The first fold line L1 and the second fold line L2 are common fold lines formed by flattening the corrugated cardboard in the thickness direction from the back sheet 5C side. The fitting folding line L3 is a guide folding line in which a plurality of cutting lines are formed at predetermined intervals on a reverse folding line formed by flattening the corrugated cardboard in the thickness direction from the face paper 5B side.

The outer plate portion 20 is formed in a substantially trapezoidal shape whose width becomes narrower in the corrugation direction from the base end (the lower bottom wall 10A side) toward the tip end (the upper plate edge portion 21 side). Therefore, inclined portions 20A inclined in a direction approaching each other from the base end toward the tip end are formed at both end portions (side end portions) in the corrugation direction of the outer plate portion 20. The dimension (protruding dimension) of the outer plate portion 20 in the corrugation direction is set smaller than the dimension (e.g., about 1/4) of the lower bottom wall 10A in the corrugation direction.

The upper plate edge 21 is formed in a substantially rectangular shape that is long in the corrugation direction, and the outer plate portion 20 is continuous with the inner plate portion 22. The dimension of the upper panel edge 21 in the corrugation direction is set to be substantially the same as the length of the side end edge of the outer panel section 20. The projecting dimension of the upper plate edge portion 21 is set to be slightly longer than the thickness of the corrugated board. In the central area in the corrugation direction of the upper plate edge portion 21, a curved hole 21A curved so as to protrude toward the inner plate portion 22 beyond the second fold line L2 is in an open state. The width of the curved hole 21A is formed substantially the same as the protruding dimension of the upper plate edge 21. An arcuate projection 21B extending from the outer panel section 20 along the contour of the curved hole 21A is formed in the upper panel edge section 21. In addition, the second fold line L2 is not formed on the arcuate convex portion 21B. In addition, since the arcuate projections 21B (the curved holes 21A) are portions constituting the external appearance of the stack tray 1, they can be omitted if not necessary.

The inner plate portion 22 is formed in a substantially trapezoidal shape whose width decreases from the base end (the upper plate edge portion 21 side) toward the tip end (the engaging convex portion 23 side) in the corrugation direction. The dimension of the inner plate portion 22 in the corrugation direction is set to be substantially the same as the dimension of the upper plate edge portion 21 in the corrugation direction. The protruding dimension of the inner plate portion 22 is set to be smaller than the protruding dimension of the outer plate portion 20 by an amount corresponding to the thickness of two corrugated sheets.

A pair of engagement pieces 24 are formed at both end portions of the inner plate portion 22 in the corrugation direction. The pair of engagement pieces 24 extend outward from both ends in the corrugation direction of the inner plate 22. A first engaging bend line L4 is formed at the boundary between each engaging piece 24 and the inner plate 22. In addition, each engaging piece portion 24 is formed with a second engaging bent line L5 located outward in the corrugation direction from the first engaging bent line L4. The pair of first engaging bending lines L4 are inclined in a direction approaching each other from the base end toward the tip end of the inner plate 22. The pair of second engaging bending lines L5 are formed substantially parallel to the corrugation direction. Further, an engaging protrusion 24A protrudes outward from an outer end in the corrugated direction of each engaging piece 24. The first engaging folding line L4 and the second engaging folding line L5 are guide folding lines in which a plurality of cutting lines are formed at predetermined intervals on a folding line formed by flattening the corrugated cardboard in the thickness direction from both the front and back surfaces.

The engaging convex portion 23 is formed in a substantially trapezoidal shape whose width becomes narrower in the corrugation direction from the base end (inner plate portion 22 side) toward the tip end (free end). The dimension of the engaging convex portion 23 in the corrugation direction is set to be substantially the same as the length of the side end edge of the inner plate portion 22. The protruding dimension of the engaging protruding portion 23 is set smaller than the protruding dimension of the inner plate portion 22 (for example, about half). The protruding dimension of the engaging protruding portion 23 may be substantially the same as that of the inner plate portion 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 smaller than the lower bottom wall 10A by one turn, and is formed into a substantially rectangular shape that is long in the corrugation direction. At both ends of the upper bottom wall 10B in the corrugation direction, the pair of notches 25A are formed so as to be recessed inward. The pair of notches 25A are cut in a substantially trapezoidal shape whose width is narrowed in the corrugation direction as approaching inward from both end portions in the corrugation direction of the upper bottom wall 10B. The notch 25A is formed in substantially the same shape (complementary shape) as the engaging convex portion 23. As will be described in detail later, in a state where the stack tray 1 is assembled (assembled state), the upper bottom wall 10B is disposed above the lower bottom wall 10A, and each of the cutout portions 25A constitutes an engagement concave portion 25 for fitting with the engagement convex portion 23.

[ third blank ]

As shown in fig. 3, the third blank 1C includes an intermediate bottom wall 10C and an end wall body 11. In the case of assembling the stack tray 1, the pair of end walls 11 on the left and right sides is formed using two third blanks 1C. Since the two third blanks 1C (one end wall body 11) have the same shape, the following description will be given of one third blank 1C (one end wall body 11).

< intermediate bottom wall >

The intermediate bottom wall 10C is connected to one end portion (lower end portion in an assembled state) in the corrugation direction of the end wall body 11 (outer end wall 30 described later) by a lower fold line L10. The intermediate bottom wall 10C is formed in a substantially rectangular shape. The dimension of the middle bottom wall 10C in the corrugation direction is set to be about half the dimension of the lower bottom wall 10A in the corrugation direction. The dimension of the intermediate bottom wall 10C in the corrugation direction is set to be substantially the same as the dimension of the lower bottom wall 10A in the corrugation direction. The first intermediate mark M2 is formed at one end (free end) of the intermediate bottom wall 10C in the corrugation direction at the center in the corrugation direction. Further, the first middle mark M2 is formed also at two corners (near both ends of the lower folding line L10) of the other end portion in the corrugation direction of the middle bottom wall 10C. In addition, two second intermediate marks M3 are formed in the central area in the corrugation direction of the intermediate bottom wall 10C. The first intermediate mark M2 and the second intermediate mark M3 are formed by cut lines.

< end wall body >

The end wall body 11 includes an outer end wall 30, a pair of outer edge walls 31, a pair of first folded back walls 32, a pair of second folded back walls 33, an inner end wall 34, a pair of support walls 35, and a pair of inner edge walls 36. The end wall body 11 is formed so as to extend in the corrugation direction as a whole.

The outer end wall 30 is disposed in a state where it is connected to the intermediate bottom wall 10C by a lower fold line L10. The pair of outer edge walls 31 are connected to both end portions of the outer end wall 30 in the corrugated direction by the side folding lines L11. The pair of first folded walls 32 are provided in a state of being connected to the corrugated-direction outer end portions of the outer edge wall 31 via the two first folded back lines L12, respectively. Between the two first folded back lines L12, a first edge portion 32A is formed. The pair of second folded walls 33 are provided in a state of being connected to the other end portions (upper end portions in the assembled state) in the corrugation direction of the outer edge wall 31 by the two second folded lines L13, respectively. Between the two second folded back lines L13, a second edge portion 33A is formed. The inner end wall 34 is provided in a state of being connected to the other end portion (upper end portion in an assembled state) in the corrugation direction of the outer end wall 30 by the third folded back line L14. The pair of support walls 35 are connected to both ends of the inner end wall 34 in the corrugation direction by a first fold line L15. The pair of inner edge walls 36 are connected to the corrugated-direction outer ends of the support walls 35 by the second bend lines L16. The lower folding line L10, the side folding line L11, and the first to third folded loops L12 to L14 are common folding lines. The first bending line L15 and the second bending line L16 are guide folding lines in which a plurality of cutting lines are formed at predetermined intervals on the reverse folding line.

Since the end wall body 11 is formed to be substantially symmetrical in the corrugation direction with respect to a center line extending in the corrugation direction, one of the walls 31, 32, 33, 35, and 36 provided as a pair will be described below.

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

The dimension (length in the corrugation direction) of one end side (lower folding line L10) in the corrugation direction of the outer end wall 30 is set to be substantially the same as the dimension in the corrugation direction of the lower bottom wall 10A. The other end edge (third folded loop line L14) of the outer end wall 30 in the corrugation direction is set to be slightly longer than one end edge of the outer end wall 30. That is, the outer shape of the outer end wall 30 is formed in a substantially trapezoidal shape whose width slightly widens in the corrugation direction as going from one end to the other end in the corrugation direction. In other words, in the assembled state, the outer end wall 30 is formed so that the width thereof gradually increases from the lower side to the upper side (the width thereof is longer in the corrugation direction). Both end edges (side folding lines L11) in the corrugation direction of the outer end wall 30 are inclined outward by about 1 degree with respect to the corrugated sheet 5A (line extending orthogonally to the lower folding line L10).

The outer edge wall 31 is formed in a substantially rectangular shape that is long in the corrugation direction. The dimension of the outer peripheral wall 31 in the corrugation direction is set to be substantially the same as the dimension of the outer end wall 30 in the corrugation direction. The dimension (protruding dimension) of the outer edge wall 31 in the corrugation direction is set to be shorter than the dimension of the outer end wall 30 in the corrugation direction (for example, about 1/4). The corner of the other end of the outer edge wall 31 is chamfered in an arc shape.

An outer extension 37A having a substantially rectangular shape is integrally formed on one end side (lower side in an assembled state) of the outer edge wall 31. The outer extension portion 37A is provided in a state of extending outward from an end portion (tip end portion) in the corrugation direction of the outer edge wall 31. Therefore, the outer extension 37A and the outer edge wall 31 are formed in a substantially L-shape as a whole.

The first edge portion 32A is formed in a substantially rectangular shape that is long in the corrugation direction, and the outer edge wall 31 is continuous with the first folded wall 32. The dimension of the first edge portion 32A in the corrugation direction is set to be substantially the same as the length of the side edge of the outer edge wall 31 excluding the chamfered corner portion of the outer edge wall 31 and the outer extension portion 37A. The protruding dimension of the first edge portion 32A is set to be slightly longer than the thickness of the corrugated board.

The first folded wall 32 is formed in a substantially rectangular shape having substantially the same size as the first edge portion 32A in the corrugation direction. The protruding dimension of the first folded-back wall 32 is set longer than the first edge portion 32A. The corner of the other end portion of the first folded-back wall 32 is chamfered. Further, the projecting dimension of the above-described outside extension portion 37A is set longer than the projecting dimension of the first folded-back wall 32.

The second edge portion 33A is formed in a substantially rectangular shape, and the outer edge wall 31 is continuous with the second folding wall 33. The dimension of the second edge portion 33A in the corrugation direction is set to be substantially the same as the length of the other end side of the outer edge wall 31 excluding the corner portion of the chamfered outer edge wall 31. The dimension (protruding dimension) of the second edge portion 33A in the corrugation direction is set to be slightly longer than the thickness of the corrugated board.

The second folded wall 33 is formed in a substantially rectangular shape having substantially the same size as the second edge 33A in the corrugation direction. The dimension (protruding dimension) of the second folding wall 33 in the corrugation direction is set longer than the second edge 33A. The corner of the other end portion of the second folded wall 33 is chamfered.

The inner end wall 34 has a generally rectangular outer shape that is approximately the same size as the outer end wall 30 in the direction of corrugation. 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 excluding the vicinity of the third folded wire L14 is formed into a substantially trapezoidal shape whose width is slightly narrowed in the corrugation direction as approaching from one end (the third folded wire L14 side) in the corrugation direction to the other end. That is, as with the outer end wall 30, in the assembled state, the inner end wall 34 is formed so that the width thereof gradually increases from the lower side toward the upper side (the width thereof is longer in the corrugated direction). Both end edges (first bending lines L15) in the corrugation direction of the inner end wall 34 are inclined outward by about 1 degree with respect to the corrugated sheet 5A (line extending orthogonally to the third folded line L14). In addition, second bend line L16 and third bend line L17 are also inclined at the same angle as first bend line L15.

The support wall 35 is formed in a substantially rectangular shape that is long in the corrugation direction. The support wall 35 is formed to be fitted into the inner end wall 34 side by extending the dicing line from the boundary between the support wall 35 and the second folded-back wall 33 toward the inside of the inner end wall 34. The dimension of the support wall 35 in the corrugation direction is set to be substantially the same as the dimension of the inner end wall 34 excluding the second folding wall 33 in the corrugation direction. The dimension (protruding dimension) of the support wall 35 in the corrugation direction is set shorter (for example, about half) than the inner end wall 34.

The support wall 35 is connected to the inner end wall 34 by a first fold line L15 and connected to the inner edge wall 36 by a second fold line L16. Further, a third bend line L17 extending in parallel to the first bend line L15 and the second bend line L16 is formed in the support wall 35. Third bend line L17 is formed between first bend line L15 and second bend line L16 at a location proximate to first bend line L15. The third bending line L17 is a guide bending line in which a plurality of cutting lines are formed at predetermined intervals on the common bending line. The interval between the first bending line L15 and the third bending line L17 is set to be substantially the same as the interval between the second bending line L16 and the extension line of the side folding line L11.

Further, an engagement groove 38 is formed along the second bending line L16 on the other end side (lower side in the assembled state) of the support wall 35. The engaging groove 38 is located slightly inward (third bend line L17 side) of the second bend line L16, and is a cut line extending substantially parallel to the second bend line L16. The support wall 35 is formed with a pair of cut lines extending inward from the second fold line L16 and having the same width as the engaging groove 38. A tongue-shaped cut piece 38A is formed in a range surrounded by the pair of dicing lines and the engagement groove 38.

The inner edge wall 36 is formed into a substantially rectangular shape having substantially the same size as the support wall 35 in the corrugation direction.

The dimension (protruding dimension) of the inner edge wall 36 in the corrugation direction is set to be shorter (for example, about half) than the protruding dimension of the outer edge wall 31. In addition, the protruding dimension of the inner edge wall 36 is set to be substantially the same as the protruding dimension of the first folding wall 32.

A substantially rectangular inner extension 37B is integrally formed on the other end side (lower side in the assembled state) of the inner edge wall 36. The inner extension 37B is provided in a state of extending outward from an end (tip end) of the inner edge wall 36 in the corrugation direction. Therefore, the inner extension 37B and the inner edge wall 36 are formed in a substantially L-shape as a whole.

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 formed into shapes substantially conforming to the outer end wall 30, the pair of outer edge walls 31, and the pair of outer extension portions 37A when turned over about the third folded back line L14.

As described above, since the first blank 1A (the lower bottom wall 10A, the side wall body 12), the second blank 1B (the upper bottom wall 10B), and the third blank 1C (the intermediate bottom wall 10C, the end wall body 11) are formed separately from each other, the stack tray 1 is assembled after the first blank 1A, the second blank 1B, and the third blank 1C are joined. The connecting step and the assembling step of the first blank 1A, the second blank 1B and the third blank 1C may be performed manually by an operator or automatically or semi-automatically by a dedicated box making machine, for example. Here, a case where the worker performs the coupling step and the assembling step by manual work will be described.

[ connecting Process ]

Next, a step (joining step) of joining the first blank 1A, the second blank 1B, and the third blank 1C will be described with reference to fig. 4 to 6. Fig. 4 is a perspective view showing a state of the end wall body 11 and the like in the course of the first step. Fig. 5 is an exploded perspective view showing the stack tray 1. Fig. 6 is a plan view showing a state where the connecting step of the stack tray 1 is completed.

< first Process >

First, the worker forms the end wall body 11 for the assembly process (first process). For example, the worker places the third blank 1C on the work table with the interior sheet 5C facing upward, and attaches double-sided tapes (not shown) to the inner end wall 34 (around the inner end opening 34A) and the inner extension portions 37B. Further, no double-sided tape is attached to the support wall 35.

Then, as shown in fig. 4, the worker folds back (inverts) the inner end wall 34 toward the outer end wall 30 side along the third folding back line L14. Then, the inner end wall 34 is overlapped on the inner surface (inner paper 5C) of the outer end wall 30, and is adhered to the inner surface of the outer end wall 30 by a double-sided adhesive tape. The support wall 35 is overlapped on the inner surfaces (see fig. 3) of the outer end wall 30 and the outer edge wall 31 across the side folding line L11. The inner edge wall 36 overlaps the inner surface of the outer edge wall 31. The inner extension 37B is overlapped on the inner surface of the outer extension 37A, and is bonded to the inner surface of the outer extension 37A with a double-sided tape.

Next, the worker attaches double-sided adhesive tapes to the first folding walls 32 and the second folding walls 33. Then, the operator folds the first edge portions 32A and the first folding walls 32 inward along the two first folding lines L12. In this state, the first folded wall 32 is overlapped on the inner edge wall 36 overlapped with the inner surface of the outer edge wall 31, and is adhered (fixed) to the outer surface (the cover paper 5B) of the inner edge wall 36 by a double-sided adhesive tape. Further, the operator turns the second edge portions 33A and the second folding walls 33 back inward along the two second folding lines L13. In this state, the second folded wall 33 is overlapped on the inner surface of the outer edge wall 31, and is bonded (fixed) to the inner surface (the back paper 5C) of the outer edge wall 31 by a double-sided tape. Further, the tip end portion of the folded-back second edge portion 33A abuts against the tip end portion (upper end portion in the assembled state) of the support wall 35.

Accordingly, the first step is completed, and the end wall body 11 (see fig. 5) in which two corrugated cardboard sheets are stacked is completed. The corrugated sheets 5A of the two corrugated cardboard sheets constituting the end wall body 11 extend in the same direction. Further, since the two end wall bodies 11 are required to assemble the stack tray 1, the worker repeats the first step described above to form the two end wall bodies 11.

< second Process >

Next, the operator connects the first blank 1A (the lower bottom wall 10A, the side wall 12) and the end wall 11 (the second step). The worker attaches a double-sided tape to the cover 5B of the intermediate bottom wall 10C extending from each end wall body 11. Next, as shown in fig. 5, the worker arranges the first blank 1A on the work table with the back paper 5C facing upward, and arranges the pair of end wall bodies 11 on both sides in the corrugation direction of the lower bottom wall 10A. Then, the worker adheres the pair of intermediate bottom walls 10C to the upper surface (back paper 5C) of the lower bottom wall 10A. The pair of intermediate bottom walls 10C are bonded to the lower bottom wall 10A with double-sided tape in a state where the top ends thereof are butted against the center of the lower bottom wall 10A in the corrugated direction (see fig. 6). At this time, the worker aligns (aligns) the lower bottom wall 10A and the intermediate bottom wall 10C by aligning the first intermediate marks M2 of the intermediate bottom wall 10C and the lower marks M1 of the lower bottom wall 10A.

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

< third step >

Next, the operator connects the second blank 1B (the upper bottom wall 10B) to each of the intermediate bottom walls 10C (a third step). The worker attaches a double-sided tape to the inner paper 5C of the upper bottom wall 10B. Then, as shown in fig. 5 and 6, the worker bonds the upper bottom wall 10B, which has the top sheet 5B facing upward, to the upper surfaces (back sheet 5C) of the pair of intermediate bottom walls 10C. The upper bottom wall 10B is bonded to each of the intermediate bottom walls 10C with a double-sided tape in a state in which the pair of notches 25A face the pair of side walls 12. At this time, the worker aligns the outlines of the respective cutout portions 25A of the upper bottom wall 10B with the respective second intermediate marks M3 of the respective intermediate bottom walls 10C, thereby positioning the respective intermediate bottom walls 10C and the upper bottom wall 10B.

Accordingly, the third step is completed, and the intermediate bottom walls 10C and the upper bottom wall 10B are connected (see fig. 6). Thus, the connection step is ended. In this state, the upper bottom wall 10B is disposed above the lower bottom wall 10A, and the intermediate bottom walls 10C are 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 three-layer 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 corrugated paper 5A of the intermediate bottom wall 10C extends in the same direction as the corrugated paper 5A of the upper bottom wall 10B. In addition, the corrugated paper 5A of the lower bottom wall 10A and the corrugated paper 5A of the upper bottom wall 10B extend in directions orthogonal to each other. As shown in fig. 6, in a state where the upper bottom wall 10B is bonded to the intermediate bottom wall 10C, a pair of engagement recesses 25 are formed in a range surrounded by the upper surfaces of the pair of intermediate bottom walls 10C and the pair of notches 25A (see fig. 6). The pair of engaging recesses 25 are formed recessed in the upper surface of the bottom wall 10.

In addition, the position of the double-sided tape to be attached in the above-described joining step is an example, and the position and the number of the double-sided tape to be attached can be changed as appropriate. In the above-described joining step, a double-sided tape is used as an example, but instead of this, an adhesive (e.g., a hot melt adhesive, a resin emulsion adhesive, or a starch adhesive) may be used.

[ Assembly procedure ]

Next, an assembling process of the stack tray 1 will be described with reference to fig. 7 to 10. Fig. 7 is a perspective view illustrating an assembly process of the stack tray 1. Fig. 8 is an enlarged perspective view of the support 35A and the like. Fig. 9 is a cross-sectional view IX-IX of fig. 1. Fig. 10 is an enlarged perspective view of the engagement piece 24 and the like. Here, a case where the worker performs the assembling process by manual work will be described.

The stack tray 1 is assembled by appropriately bending the joined first blank 1A, second blank 1B, and third blank 1C. As shown in fig. 7, the operator bends the pair of left and right outer end walls 30 upward along the lower folding line L10. The end wall body 11 (outer end wall 30) is bent at a substantially right angle with respect to the bottom wall body 10, and is provided in a standing posture at a peripheral edge portion (short side) of the bottom wall body 10.

Next, the operator bends the four outer edge walls 31 positioned at the four corners of the bottom wall body 10 inward (toward the bottom wall body 10) along the side folding lines L11. The outer edge wall 31 is bent at a substantially right angle to the outer end wall 30 and extends 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 at a substantially right angle to the support wall 35 along the second bending line L16 and extends from the side end of the support wall 35 toward the side wall body 12. The outer extension portion 37A and the inner extension portion 37B (hereinafter also simply referred to as "extension portions 37") are provided in a state of extending toward the sidewall 12 in a substantially vertical posture on the first folding line L1. The extending portions 37 facing each other in the left-right direction extend to positions overlapping the engaging recessed portions 25 without contacting the distal ends of the extending portions. Further, since the inclined portions 20A are formed at both left and right end portions of the outer plate portion 20, the outer edge wall 31 and the like can be prevented from catching on the end portions of the outer plate portion 20 during the bending operation of the outer edge wall 31 and the like. This enables the bending operation of the outer edge wall 31 and the like to be smoothly performed.

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 in contact with the outer edge wall 30, and the like, and is bent along the first bend line L15 and the second bend line L16 while pushing the portion forming the third bend line L17 inward (see the dashed thick arrow in fig. 8). That is, the support wall 35 is formed by folding the inner edge wall 36 concavely at the second fold line L16 and concavely at the first fold line L15, and also folding convexly while pushing the third fold line L17 inward, thereby forming the support pillar 35A having a rectangular cross section. The face between the second bend line L16 and the third bend line L17 in the support wall 35 is bent at substantially right angles with respect to the inner edge wall 36, and is disposed substantially parallel to the inner surface of the outer end wall 30. In addition, the surface of the support wall 35 between the first bend line L15 and the third bend line L17 is bent at substantially right angles to the inner end wall 34 and is disposed substantially parallel to the inner surface of the outer edge wall 31.

The support wall 35 (the pillar 35A) is provided so as to protrude substantially in an L shape from a corner formed by the outer end wall 30 and the outer edge wall 31 toward the inside of the stack tray 1 when viewed from the top. That is, the four support columns 35A are formed in a square tube shape at the four corners of the stack tray 1. Further, each of the support columns 35A extends upward from the upper surface of the bottom wall body 10. The upper end surface of each support wall 35 (pillar 35A) is provided at a height corresponding to the height of the second folded wall 33 below 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).

Next, as shown in fig. 9, the operator bends the pair of front and rear outer plate portions 20 upward along the first folding line L1. The outer plate portion 20 is bent at a substantially right angle with respect to the bottom wall 10, and extends upward from the peripheral edge (long side) of the bottom wall 10. In this state, the outer panel section 20 is superimposed on the outer surface of each of the outer extensions 37A.

Next, the operator bends the pair of front and rear upper plate edge portions 21 and the pair of front and rear inner plate portions 22 along the two second folding lines L2 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 with respect to the outer plate portion 20 so as to cover the upper portions of the extension portions 37, and the extension portions 37 are sandwiched between the inner plate portion 22 and the outer plate portion 20. In addition, at the time of folding back the inner panel portion 22 and the like, since the engagement piece portions 24 connected to both the left and right sides of the inner panel portion 22 are brought into contact with the outer edge wall 31 and the like and folded outward at the first engagement bending line L4 (see fig. 10), the folding back operation of the inner panel portion 22 and the like can be smoothly performed. The outer plate portion 20, the upper plate edge portion 21, and the inner plate portion 22 are bent so that the arcuate convex portion 21B protrudes upward relative to the upper plate edge portion 21 (see fig. 1).

Next, the operator bends the pair of front and rear engaging projections 23 along the fitting bending line L3 to position the cover paper 5B inside, and fits the pair of front and rear engaging projections 23 into the pair of front and rear engaging recesses 25. The engaging convex portion 23 is bent at a substantially right angle with respect to the inner plate portion 22, and is in a posture along the upper surface of the bottom wall 10. The engaging convex portion 23 is fitted (engaged) in the engaging concave portion 25 in a state along the bottom wall 10 with the extension portions 37 sandwiched between the outer panel portion 20 and the inner panel portion 22. The engaging convex portion 23 forms a plane substantially identical to the upper surface of the bottom wall body 10 (the upper bottom wall 10B) in a state of being fitted in the engaging concave portion 25.

Next, as shown in fig. 10, the operator presses the pair of left and right engagement pieces 24 of each inner plate portion 22 into the step between the lower end of the first folded wall 32 and the inner edge wall 36. The engaging piece portion 24 is bent along the first engaging bend line L4 and the second engaging bend line L5 while the engaging projection 24A abuts against the cut piece 38A (see fig. 8). When the engagement projection 24A is press-fitted into the pillar 35A while the cut-in piece 38A is press-fitted into the step between the lower end of the first folded wall 32 and the inner edge wall 36, the engagement projection 24A is engaged with the engagement groove 38 (see fig. 1).

Accordingly, the assembly operation of the stack tray 1 is completed (see fig. 1). In this state, the corrugated paper 5A of each of the end wall body 11, the outer plate portion 20, and the inner plate portion 22 extends in the vertical direction. The user stores the object to be packaged such as a commodity on the upper surface of the bottom wall body 10. Further, since the end openings 30A and 34A are formed in the left and right end surfaces and the openings 13 are formed in the front and rear side surfaces and the upper surface, the objects to be packed inside can be checked (visually observed) from four directions outside the stacking tray 1. The outer end opening portion 30A and the inner end opening portion 34A may be omitted if there is no need to visually observe the object to be packed from the outside.

[ laminating Effect ]

Next, the stacking operation of the stack tray 1 will be described with reference to fig. 11 and 12. Fig. 11 is a perspective view showing a stacked state of the stack trays 1. Fig. 12 is a perspective view illustrating a stacking function of the stack tray 1.

The stack tray 1 can be stacked in plural. Next, for convenience of explanation, a case of stacking two stacking trays 1 will be explained. In the following description, for convenience, the lower stacking tray 1 is referred to as a "lower tray 1 (D)" and the respective structures of the lower tray 1(D) are denoted by a reference numeral "(D)", the upper stacking tray 1 is referred to as an "upper tray 1 (U)", and the respective structures of the upper tray 1(U) are denoted by a reference numeral "(U)".

First, the worker places the upper tray 1(U) above the lower tray 1(D) in the same orientation, 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 places the four lower corner portions of the bottom wall 10(U) on the upper end surfaces of the four support columns 35a (D). Accordingly, the upper tray 1(U) is stacked on the lower tray 1 (D).

In the stack tray 1 according to the first embodiment described above, the engaging convex portion 23 is configured to be fitted (engaged) in the engaging concave portion 25 in a posture substantially parallel to the bottom wall 10 in a state where the extension portion 37 is sandwiched by the side wall 12 of the double-wall structure (see fig. 9). According to this configuration, when the extension portion 37 is lifted up on the sidewall 12 by the force of the end wall 11 being tilted outward, the sidewall 12 is rotated outward (in the direction opposite to the thick arrow in fig. 9) so as to be unfolded (in a state before the outer panel portion 20, the inner panel portion 22, and the like are bent), and therefore, the tip end of the engaging convex portion 23 abuts against the inner surface of the engaging concave portion 25 (the cross section of the notched portion 25A). In this way, the engaging convex portion 23 is hooked to the engaging concave portion 25 and is hard to be detached from the engaging concave portion 25, and thereby the sidewall 12 can be prevented from being unfolded. This can maintain the state in which the extension 37 is sandwiched by the sidewall 12. As a result, when a plurality of stack trays 1 are stacked, the assembled state of the lower stack tray 1 receiving the load can be maintained.

Further, according to the stack tray 1 of the first embodiment, since the engagement piece portion 24 is engaged with the engagement groove 38 in a state where the engagement convex portion 23 is engaged with the engagement concave portion 25, the rotation of the inner plate portion 22 in the expanding direction can be effectively prevented. This can maintain the state in which the engaging convex portion 23 is fitted in the engaging concave portion 25, and can further effectively maintain the state in which the extension portion 37 is sandwiched by the sidewall 12.

The stack tray 1 according to the first embodiment includes two corrugated cardboard sheets (a lower bottom wall 10A and an upper bottom wall 10B) in which the corrugated cardboard 5A of the bottom wall 10 is perpendicular to each other (see fig. 5). With this configuration, the flexural rigidity, torsional rigidity, and the like of the bottom wall body 10 can be improved as compared with a case where the corrugated sheets 5A of the lower bottom wall 10A and the upper bottom wall 10B are arranged in the same direction. Accordingly, even a heavy object to be packed can be appropriately stored.

In addition, according to the stack tray 1 of the first embodiment, since the bottom wall body 10 has a three-layer laminated structure in which the lower bottom wall 10A, the pair of intermediate bottom walls 10C, and the upper bottom wall 10B are laminated (see fig. 9), the rigidity and the loading strength of the bottom wall body 10 can be further improved. Further, the end wall body 11 can be firmly connected to the bottom wall body 10 by sandwiching the intermediate bottom wall 10C between the lower bottom wall 10A and the upper bottom wall 10B.

In the stack tray 1 according to the first embodiment, the end wall body 11 and the like have a double-layer laminated structure, and the corrugated paper 5A of the end wall body 11 extends in the longitudinal direction (see fig. 4). According to this structure, the axial rigidity, the compressive strength, and the like of the end wall body 11 can be improved as compared with a case where the corrugated paper 5A of the end wall body 11 is supposed to extend in the lateral direction (the direction orthogonal to the stacking direction). Accordingly, a plurality of stacking trays 1 accommodating heavy objects to be packed can be stacked.

In addition, according to the stack tray 1 of the first embodiment, the inner edge wall 36 is folded concavely at the second folding line L16, so that the support wall 35 is automatically folded at the first folding line L15, the second folding line L16, and the third folding line L17 to form the square cylindrical pillar 35A (see fig. 8). With this structure, the support 35A for supporting the upper stacking tray 1 (upper tray 1(U)) can be formed easily in a short time.

In addition, according to the stack tray 1 of the first embodiment, when the end wall body 11 (the outer end wall 30 and the inner end wall 34) is viewed from the end surface side (the left-right direction), the opening 13 can be formed wider than the bottom wall body 10 because the width is gradually increased from the lower side toward the upper side. Accordingly, when the bottom wall 10(U) of the upper tray 1(U) is inserted into the opening 13(D) of the lower tray 1(D), the bottom wall 10(U) can be prevented from being caught by the upper end of the end wall 11(D) of the lower tray 1 (D). Accordingly, the upper tray 1(U) can be smoothly inserted into the lower tray 1(D), and the stacking work of the stacked trays 1 can be easily performed.

Further, according to the stack tray 1 of the first embodiment, the end surface (cut surface) of the inner edge wall 36 can be covered by folding back the first folded-back wall 32 and overlapping the inner edge wall 36. Further, the end surface (cut surface) of the outer edge wall 31 can be covered by folding back the second folded-back wall 33 to overlap the outer edge wall 31. Accordingly, the corrugated cardboard 5A and the like appearing on the end face of the corrugated cardboard can be covered, and the stack tray 1 having good appearance can be provided.

[ second embodiment ]

Next, a description will be given of the stack tray 2 according to the second embodiment with reference to fig. 13 to 16. Fig. 13 is a plan view showing the first blank 2A and the second blank 2B of the stacking tray 2. Fig. 14 is a plan view showing the third blank 2C of the stacking tray 2. FIG. 15 is a drawing showing

A plan view of the state in which the first blank 2A and the third blank 2C are joined. Fig. 16 is a sectional view illustrating a connecting step (third step) of the stack tray 2. In the following description, the same components as those of the stack tray 1 according to the first embodiment are denoted by the same reference numerals, and the same description thereof is omitted.

The stack tray 2 is formed by joining and assembling the first blank 2A, the second blank 2B, and the third blank 2C shown in fig. 13 and 14. These first blank 2A, second blank 2B and third blank 2C are each formed by punching out a sheet of corrugated cardboard (double-faced corrugated cardboard) by 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 dimension of the lower floor wall 10A in the corrugation direction is formed slightly shorter than the dimension of the base end portion of the outer plate portion 20 in the corrugation direction. Therefore, both ends in the corrugation direction of the lower floor wall 10A are slightly recessed inward in the corrugation direction than the pair of side wall bodies 12 (outer panel sections 20). Further, the lower side mark M1 is omitted from the lower bottom wall 10A.

[ second blank ]

Second blank 2B includes an upper base wall 40B. On both sides of the upper bottom wall 40B in the corrugation direction, a pair of score lines L21 (cut lines) are formed along the contour of the notch portion 25A while leaving one of the inner sides as a bottom wall folded line L20 (common fold line, guide fold line). A pair of score lines L21 extend so as to expand from both ends in the corrugation direction of the bottom wall folded back line L20 toward the ends in the corrugation direction of the upper bottom wall 40B. That is, a range surrounded by the bottom wall folded-back line L20 and the pair of notch lines L21 (hereinafter, also referred to as "notch folded-back portion 41") is formed in a substantially trapezoidal shape so as to constitute the notch portion 25A. The pair of notch portions 25A are each formed in a state in which the notch folded-back portion 41 (a part of the upper bottom wall 40B) is folded back downward along the bottom wall folded-back line L20. Further, two upper marks M4 (cut lines) located at the center in the corrugation direction of the two bottom wall return lines L20 are formed on the upper bottom wall 40B.

[ third 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) in the corrugation direction of the intermediate bottom wall 40C, a coupling convex portion 42A and a coupling concave portion 42B are formed in a row in the corrugation direction. The coupling convex portion 42A protrudes outward from the free end of the intermediate bottom wall 40C, and the coupling concave portion 42B is recessed inward from the free end of the intermediate bottom wall 40C. In the intermediate bottom wall 40C, a pair of fitting grooves 43 are formed at positions sandwiching the coupling convex portion 42A and the coupling concave portion 42B from both sides in the corrugation 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 to fit the notch folded-back portion 41 after the upper bottom wall 40B is turned over along the bottom wall folded-back line L20. In addition, the first intermediate mark M2 and the second intermediate mark M3 are omitted from the intermediate bottom wall 10C.

The contact portion 44 is connected to one end portion (lower end portion in an assembled state) in the corrugation direction of each outer edge wall 31 of the end wall body 11 by a shear line L22 such as a perforated 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 side portions 44A of the pair of contact portions 44 are inclined so as to be distant from each other as approaching from both end portions in the corrugation direction of the lower folding line L10 toward the intermediate bottom wall 40C. Further, the inner end wall 34 is provided in a state of being connected to the other end portion (upper end portion in an assembled state) in the corrugation direction of the outer end wall 30 by the two third folded back lines L14. Between the two third return lines L14, a third edge 34B is formed.

[ connecting Process ]

Next, a description will be given of a connecting step of the first blank 2A, the first blank 2B, and the third blank 2C with reference to fig. 15 and 16. Here, a case where the worker performs the coupling step by manual work will be described.

First, the worker forms the end wall body 11 in the same procedure as the first step of the already described connection step. Next, the worker performs the second process. The worker attaches double-sided adhesive tapes to the surface paper 5B of the pair of intermediate bottom walls 40C, and disposes the pair of end wall bodies 11 on both sides in the corrugation direction of the lower bottom wall 10A on the work table. As shown in fig. 15, when the operator gradually moves the pair of intermediate bottom walls 40C closer to each other in a state where the pair of intermediate bottom walls 40C are disposed on the upper surface of the lower bottom wall 10A, the inclined side portions 44A of the pair of front and rear abutting portions 44 abut against the inclined portions 20A of the pair of front and rear outer plate portions 20. Then, the pair of intermediate bottom walls 40C are positioned on the lower bottom wall 10A. In this state, the operator causes one of the coupling convex portions 42A to fit into the other coupling concave portion 42B and the other coupling convex portion 42A to fit into the one coupling concave portion 42B while flexing each of the intermediate bottom walls 40C. After that, the operator presses each of the intermediate bottom walls 40C tightly against the lower bottom wall 10A, thereby adhering each of the intermediate bottom walls 40C to the lower bottom wall 10A with the double-sided tape (the second step is finished). After the second step is completed, each contact portion 44 is cut off from the outer edge wall 31 along the cutting line L22 and 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 each other.

Next, the worker performs the third step. As shown in fig. 16, the worker turns the pair of notched folded-back portions 41 of the upper bottom wall 40B downward to form the notched portion 25A. Next, the worker attaches double-sided adhesive tapes to the center portion of the lower surface of the upper bottom wall 40B and the lower surfaces of the pair of notch folded-back portions 41 that are folded back. The operator adheres the upper bottom wall 40B, which faces upward the top sheet 5B, to the upper surfaces of the pair of intermediate bottom walls 40C. Specifically, the worker aligns the upper marks M4 (see fig. 13) of the upper bottom walls 40B with the center joints of the pair of intermediate bottom walls 40C, thereby aligning the intermediate bottom walls 40C with the upper bottom wall 10B. Then, the operator fits the pair of notch folded-back portions 41 folded back on the lower surface of the upper bottom wall 40B into the pair of fitting grooves 43 connected to the centers of the pair of intermediate bottom walls 40C. In this way, the upper bottom wall 40B is bonded to each of the intermediate bottom walls 10C with the double-sided tape in a state where the pair of notched folded-back portions 41 are fitted in the pair of fitting grooves 43 (the third step is completed).

Accordingly, the connection step is ended. In this state, similarly to the stack tray 1 according to the first embodiment, the bottom wall 10 having a three-layer laminated structure is formed, and the pair of engaging recesses 25 are formed on the upper surface of the bottom wall 10 (see fig. 6, 9, and the like). After that, the stack tray 2 is assembled in substantially the same procedure as the assembly process described above (see fig. 1 and the like).

According to the stack tray 2 of the second embodiment, the same effects as those of the stack tray 1 of the first embodiment can be obtained. In addition, according to the stack tray 2 of the second embodiment, the intermediate bottom wall 40C can be easily and accurately positioned with respect to the lower bottom wall 10A only by the abutting portion 44 of the end wall 11 abutting against the inclined portion 20A of the outer plate portion 20.

Further, since the notched folded-back portion 41 (a part of the upper bottom wall 40B) folded back by the bottom wall folded-back line L20 is fitted into the fitting groove 43 of the intermediate bottom wall 40C, the upper bottom wall 40B can be easily and accurately positioned with respect to the intermediate bottom wall 40C.

The abutting portion 44 described above may be provided on the outer edge wall 31 of the stack tray 1 according to the first embodiment. In the stack tray 2 according to the second embodiment, the abutting 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 stack tray 1 according to the first embodiment and the stack tray 2 according to the second embodiment, the corrugated sheets 5A of the upper bottom walls 10B and 40B and the intermediate bottom walls 10C and 40C are aligned in the same direction, but are not limited thereto, and may be orthogonal (cross) to each other. The corrugated sheets 5A of the lower bottom wall 10A and the upper bottom walls 10B and 40B (the intermediate bottom walls 10C and 40C) are orthogonal to each other, but are not limited thereto, and may intersect at an angle other than 90 degrees. In the stack tray 1 according to the first embodiment and the stack tray 2 according to the second embodiment, the pair of intermediate bottom walls 10C are sandwiched between the lower bottom wall 10A and the upper bottom wall 10B, but the present invention is not limited thereto. For example, the pair of intermediate bottom walls 10C may be bonded to the lower surface of the lower bottom wall 10A.

In the stack tray 1 according to the first embodiment and the stack tray 2 according to the second embodiment, the outer extension portion 37A and the inner extension portion 37B are attached, but the present invention is not limited thereto. For example, either one of the outer extension portion 37A and the inner extension portion 37B may be omitted. In the stack tray 1 according to the first embodiment and the stack tray 2 according to the second embodiment, the engagement piece portion 24 is engaged with the end wall body 11 to assist in suppressing the expansion of the side wall body 12. For example, the engagement piece 24 and the engagement groove 38 may be omitted as long as the state in which the extension portion 37 is sandwiched by the sidewall 12 can be effectively maintained only by fitting the engagement convex portion 23 and the engagement concave portion 25.

[ third embodiment ]

As described above, in the stack tray 1 according to the first embodiment and the stack tray 2 according to the second embodiment, the bottom wall body 10 is formed in the three-layer laminated structure, and the end wall body 11 is formed in the two-layer laminated structure. For example, as the stack tray 3 according to the third embodiment, the bottom wall 50 may be formed of two corrugated cardboard sheets, and the end wall 51 may be formed of one corrugated cardboard sheet. Next, referring to fig. 17, a brief description will be given of the stack tray 3 according to the third embodiment. Fig. 17 is a plan view showing the first blank 3A and the second blank 3B of the stacking tray 3. In the following description, the same components as those of the stack tray 1 according to the first embodiment are denoted by the same reference numerals, and the same description thereof is omitted.

The first blank 3A includes a lower bottom wall 50A, a pair of end wall bodies 51 and a pair of side wall bodies 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 folded wall 32, the second folded wall 33, and the like, which are the structures of the stacking tray 1 according to the first embodiment, are omitted. Each end wall body 51 is constituted by the inner end wall 34, the support wall 35, the inner edge wall 36, the inner extension 37B, and the like. The corrugated paper 5A of the first blank 3A extends in a direction parallel to the long sides of the lower bottom wall 50A. The corrugated paper 5A of the second blank 3B extends in a direction parallel to the short sides of the upper bottom wall 50B. The worker can assemble the stack tray 3 by bonding the upper bottom wall 50B to the upper surface of the lower bottom wall 50A to form the bottom wall 50 having a double-layered structure, and erecting the end wall 51 and the side wall 12 around the bottom wall 50. The corrugated paper 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 (not shown) may be formed only by the lower bottom wall 50A. In this case, for example, it is preferable to form the lower bottom wall 50A, the pair of side wall bodies 12, and the pair of end wall bodies 51 by using one sheet of a multi-layer double-faced corrugated cardboard (a single-faced corrugated cardboard in which a liner paper is pasted to a single face of the corrugated cardboard 5A is pasted to a double-faced corrugated cardboard). In this case, it is preferable that the single-faced corrugated paper is partially removed to form the engaging concave portion 25 in the lower bottom wall 50A and the engaging convex portion 23 in the side wall body 12 (inner plate portion 22).

In the stack tray 3 according to the first to third embodiments (including the modified examples, the same applies hereinafter), the engaging convex portion 23 is formed in a substantially trapezoidal shape whose width is narrowed from the base end toward the tip end, and the engaging concave portion 25 is formed in a substantially trapezoidal shape whose width is narrowed from the end (edge) of the bottom wall 10, 50 toward the inner side. For example, as shown in fig. 18A, the engaging convex portion 23 may be formed in a substantially trapezoidal shape whose width increases from the base end toward the tip end, and the engaging concave portion 25 may be formed in a substantially trapezoidal shape whose width increases from the end of the bottom wall body 10, 50 toward the inner side (first modification). Alternatively, for example, as shown in fig. 18B, the engaging convex portions 23 and the engaging concave portions 25 may be formed in a concave-convex shape (comb-tooth shape) (second modification). In addition, the engaging convex portion 23 and the like may be formed in a triangular shape, a rectangular shape, a semicircular shape, and the like (not shown).

In the stack trays 1 to 3 according to the first to third embodiments, the engaging convex portions 23 and the engaging concave portions 25 are formed to be long in the left-right direction, but the present invention is not limited thereto. For example, as shown in fig. 19A, the engaging convex portion 23 may be formed in the center portion in the left-right direction of the inner plate portion 22, and the engaging concave portion 25 may be formed in the center portion in the left-right direction of the bottom wall bodies 10, 50 (third modification). Alternatively, for example, as shown in fig. 19B, a plurality of (e.g., two in fig. 19B) engaging convex portions 23 and engaging concave portions 25 may be formed at predetermined intervals (discretely) in the left-right direction (fourth modification).

[ fourth embodiment ]

Next, a description will be given of the stack tray 4 according to the fourth embodiment with reference to fig. 20 to 22. Fig. 20 is a perspective view showing the stack tray 4. Fig. 21 is a plan view showing the first blank 4A and the second blank 4B of the stacking tray 4. Fig. 22 is a plan view showing the third blank 4C of the stacking tray 4. In the following description, the same reference numerals are given to the same or corresponding components as those of the stack tray 1 according to the first embodiment, and the description thereof will be omitted.

[ outline of Stacking tray ]

As shown in fig. 20, the stack tray 4 according to the fourth embodiment is different from the stack tray 1 according to the first embodiment in that the rear surface is closed and an opening 63 is provided continuously from the front surface to the upper surface. The stack tray 4 is different from the stack tray 1 according to the first embodiment in that it includes an end piece 66 connected to the peripheral edge of the bottom wall 60 on which the end wall 61 is disposed and a stacking projection 88 projecting from the upper end surface of each support column 81A (details will be described later). In the stack tray 4, a bottom wall 60 is formed of two corrugated cardboard sheets (a double-layered structure) (details will be described later).

The stack tray 4 is formed by joining and assembling the first blank 4A, the second blank 4B, and the third blank 4C shown in fig. 21 and 22. These first blank plate 4A, second blank plate 4B and third blank plate 4C are each formed by punching out a sheet of corrugated cardboard (double-faced corrugated cardboard) by 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 piece bodies 66. The side wall 12 and the back wall 65 are connected to both ends of the lower bottom wall 60A in the corrugation direction by a first fold line L1. The pair of end pieces 66 is provided in a state of being connected to both end portions in the corrugation direction of the lower bottom wall 60A via the third fold line L30. Note that the side wall 12 is different in shape from the side wall 12 of the first embodiment, and the bending hole 21A, the engaging piece 24, and the like are omitted, but since the basic functions of the side wall 12 are the same as those of the side wall 12 of the first embodiment, the description thereof and the like are omitted. Since the pair of end pieces 66 are formed to be substantially symmetrical in the corrugation direction with the lower bottom wall 60A interposed therebetween, description will be given below of one (right side in fig. 21) of the end pieces 66.

< lower bottom wall >

The lower bottom wall 60A is formed in a substantially rectangular shape that is long in the corrugation direction. The lower marks M1 are formed on the lower bottom wall 60A at the corrugation direction end on the back surface wall 65 side at the corrugation direction center. Four laminated holes 67 are formed near the four corners of the lower bottom wall 60A. Each of the folding holes 67 is a slit formed at an angle of substantially 45 degrees to the first folding line L1 and the third folding line L30. That is, the vicinity of the four corners of the lower bottom wall 60A is divided into regions of equilateral right triangles by the lamination holes 67.

< rear wall >

The back wall 65 is formed in a substantially rectangular shape that is long in the corrugation direction. The dimension in the corrugation direction of the back face wall 65 is set to be substantially the same as the dimension in the corrugation direction of the lower bottom wall 60A. The dimension of the back surface wall 65 in the corrugation direction is set to be substantially the same as the height of the support 81A. Six attachment marks M5 (cut lines) are formed on both sides of the back surface wall 65 in the corrugation direction.

< outer sheet >

The end piece 66 includes an outer piece portion 70, a rim portion 71, an inner piece portion 72, and a second engaging protrusion 73. The outer panel portion 70 is connected to one end of the lower bottom wall 60A in the corrugation direction by a third fold line L30. The inner sheet portion 72 is connected to the distal end portion of the outer sheet portion 70 at two frame bending lines L31. The frame portion 71 is formed between two frame bending lines L31. The second engaging convex portion 73 is connected to the distal end portion of the inner piece portion 72 via the second fitting/bending line L32. The third folding line L30 is a universal folding line, and the rim folding line L31 and the second engaging folding line L32 are guide folding lines.

The outer sheet portion 70 is formed in a substantially rectangular shape that is long in the corrugation direction. The dimension of the outer sheet portion 70 in the corrugation direction is set to be substantially the same as the dimension of the lower bottom wall 60A in the corrugation direction. The dimension (protruding dimension) of the outer sheet portion 70 in the corrugated direction is set to be substantially the same as the protruding dimension of the outer sheet portion 20 of the side wall body 12. The second extension portion 74 is provided in a state of being connected to an end portion (side end portion) of the outer sheet portion 70 on the side wall body 12 side by an extension folding line L33 (universal folding line). The second extended portion 74 is formed in a substantially rectangular shape that is long in the corrugation direction, and extends to the outside in the corrugation direction than the extended line of the second fold line L2.

The frame portion 71 is connected to the vicinity of the middle of the outer sheet portion 70 in the corrugation direction by a frame bending line L31. The frame edge portion 71 is formed in a substantially rectangular shape that is long in the corrugation direction, and the outer sheet portion 70 and the inner sheet portion 72 are continuous. The dimension of the frame edge portion 71 in the corrugation direction is set to a length of about half the dimension of the outer sheet portion 70 in the corrugation direction. The protruding dimension of the rim portion 71 is set to be slightly longer than the thickness of the corrugated board.

The inner piece portion 72 and the second engaging projection 73 are formed in a substantially rectangular shape having substantially the same size as the rim portion 71 in the corrugated direction. The protruding dimension of the inner sheet portion 72 is set to be shorter than the protruding dimension of the outer sheet portion 70 by an amount corresponding to the thickness of one corrugated board. The protruding dimension of the second engaging projection 73 is set to be shorter than the protruding dimension of the inner piece portion 72 (for example, about half). The protruding dimension of the second engaging projection 73 may be substantially the same as the protruding 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 base wall 60B. The upper bottom wall 60B is smaller than the lower bottom wall 60A by one turn, and is formed into a substantially rectangular shape that is long in the corrugation direction. The dimension of the upper bottom wall 60B in the corrugation direction is set to a value equal to or less than a value obtained by subtracting the protruding dimension of the engaging convex portion 23 from the dimension of the lower bottom wall 60A in the corrugation direction. At one end (the front end in the assembled state) in the corrugation direction of the upper bottom wall 60B and at the center in the corrugation direction, a substantially semicircular finger hook recess 75A is formed in a recessed state. An upper mark M6 (cut line) is formed at the other end (rear end in the assembled state) of the upper bottom wall 60B in the corrugation direction and at the center in the corrugation direction.

Four pillar notches 76 are cut out in four corners of the upper bottom wall 60B in a substantially rectangular shape so as to correspond to the four pillars 81A. Two of the column cutout portions 76 located on both sides in the corrugation direction with the finger hook recess portion 75A interposed therebetween are formed smaller than the other two column cutout portions 76. Specifically, two relatively small column cutout portions 76 are cut out by an amount corresponding to the protruding dimension of the engagement convex portion 23 shallower than the other two column cutout portions 76. The pair of second notches 77A are formed in a recessed state inwardly at both ends of the upper bottom wall 60B in the corrugation direction. The second notch 77A is formed in substantially the same shape (complementary shape) as the second engaging projection 73. Further, at the center in the corrugated direction of the edge portion of the second notch portion 77A, a substantially semicircular finger hook recess portion 77B is formed in a recessed state.

[ third blank ]

As shown in fig. 22, the third blank 4C includes an end wall body 61. When the stack tray 4 is assembled, the pair of end walls 61 on the left and right sides is formed by using two third blanks 4C having a bilaterally symmetrical shape. Since the two third blanks 4C (the pair of end wall bodies 61) are identical in shape when turned upside down, the description will be given below of one third blank 4C (the left end wall body 61 in fig. 22).

< end wall body >

End wall body 61 includes outer end wall 30, outer edge wall 31, connecting tab 80, 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 corrugation direction. The outer edge wall 31 is connected to one end portion (side end portion (front end portion in an assembled state)) in the corrugated direction of the outer end wall 30 by a side folding line L11. In the assembled state, a substantially rectangular extension 82 is integrally formed on the lower side of the outer edge wall 31. The extension portion 82 is provided in a state of extending outward from the distal end portion of the outer edge wall 31. Therefore, the extension 82 and the outer edge wall 31 are formed in a substantially L-shape as a whole. An extension folding line L40 for folding the extension portion 82 approximately halfway is formed in the middle portion of the extension portion 82. The extended return line L40 is a half-cut line obtained by cutting approximately half of the face paper 5B in the thickness direction, or a perforated line obtained by arranging a plurality of cut lines at predetermined intervals.

The connecting piece 80 is provided in a state of being connected to the other end portion (rear end portion in an assembled state) in the bellows direction of the outer end wall 30 by the side folding line L11. The connecting piece 80 is formed into a quadrangle elongated in the corrugation direction, and a connecting (continuation) mark M7 is formed at the center of the connecting piece 80 in the corrugation direction.

The inner end wall 34 is provided in a state of being connected to the end portion in the corrugation direction (the upper end portion in the assembled state) of the outer end wall 30 by the two third folded back lines L14. Between the two third return lines L14, a third edge 34B is formed. The pair of support walls 81 are connected to both ends of the inner end wall 34 in the corrugation direction by a first fold line L15.

Further, in the first embodiment, the outer end wall 30 (inner end wall 34) is formed in a substantially trapezoidal shape whose width gradually increases from the lower side toward the upper side, but in the fourth embodiment, the outer end wall 30 and the like are formed in a rectangular shape whose width is substantially the same from the lower side toward the upper side. In the first embodiment, the side folding line L11, the first folding line L15, and the like are inclined with respect to the corrugated cardboard 5A, but in the fourth embodiment, the side folding line L11 and the like are formed substantially parallel to the corrugated cardboard 5A. As described above, the outer end wall 30 and the like, the side folding line L11 and the like are slightly different from those of the first embodiment, but their basic functions are the same as those of the outer end wall 30 and the like, the side folding line L11 and the like of the first embodiment, and therefore, the description thereof and the like is omitted. The outer end wall 30 and the like and the side folding line L11 and the like according to the fourth embodiment may be the same as the outer end wall 30 and the like and the side folding line L11 and the like according to the first embodiment.

Each support wall 81 is formed in a substantially rectangular shape as a whole that is long in the corrugation direction. The dimension of each support wall 81 in the corrugation direction is set to be substantially the same as the dimension of the inner end wall 34 in the corrugation direction. The dimension (protruding dimension) of each support wall 81 in the corrugation direction is set longer than the dimension of the inner end wall 34 in the corrugation direction. Since the pair of support walls 81 are formed symmetrically in the corrugation 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 fixing wall 85, and a diagonal wall 86. The main body wall 83 is disposed in a state of being connected to the inner end wall 34 by a first bend line L15, and has a second bend line L41 extending in parallel with the first bend line L15. The contact wall 84 is provided in a state of being connected to the main body wall 83 via the third folding line L42. The fixing wall 85 is provided in a state of being connected to the contact wall 84 by a fourth bending line L43. The diagonal wall 86 is provided in a state of being connected to the fixed wall 85 by a fifth bending line L44. The first bend line L15, the second bend line L41 to the fifth bend line L44 are formed parallel to each other and at substantially equal intervals. The first bending line L15 is a guide folding line, and the second bending line L41 to the fifth bending line L44 are general folding lines.

The diagonal wall 86 is formed in a substantially quadrangular shape having a width wider than the contact wall 84 and the fixing wall 85 in the corrugation direction. As will be described in detail later, the diagonal wall 86 is formed to have a width substantially equal to a diagonal line of the square pillar 81A. Both ends in the corrugation direction of the diagonal wall 86 are curved so as to protrude toward the outer end wall 30 side (upward in the assembled state). In the assembled state, a curved recess 87 is formed at the lower end of the diagonal wall 86, and in the assembled state, a stacking projection 88 projecting upward from the main body wall 83 (contact wall 84, fixing wall 85) is formed at the upper end of the diagonal wall 86. The protruding amount of the stacking projection 88 is substantially the same as the recessed amount of the curved recess 87.

[ connecting Process ]

Next, a step (connecting step) of connecting the first blank 4A to the third blank 4C will be described with reference to fig. 21 to 24. Fig. 23 is a perspective view showing a state where the connection step of the stack tray 4 is completed. Fig. 24 is an enlarged perspective view of the support wall 82 and the like.

< first Process >

First, the operator forms the end wall body 61 from the third blank 4C (first step). The operator attaches double-sided tape (not shown) to the inner end wall 34 (around the inner end opening 34A) and folds (turns) the inner end wall 34 (third edge portion 34B) toward the outer end wall 30 along the two third folding lines L14. Then, the inner end wall 34 is overlapped on the inner surface (inner paper 5C) of the outer end wall 30, and is adhered to the inner surface of the outer end wall 30 by a double-sided adhesive tape.

Next, the worker attaches double-sided tape to the cover paper 5B of the fixed wall 85 (or along the side folding line L11 of the outer end wall 30). Next, the operator bends the support wall 81 so as to roll in (see fig. 23 and 24). Specifically, the operator folds the diagonal wall 86 inward along the fifth folding line L44 and folds the contact wall 84 inward along the third folding line L42. Then, the fixing wall 85 is bonded to the inner surface of the outer end wall 30 by a 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 folded along a third folding line L42 and a fifth folding line L44 (see fig. 23 and 24).

Further, the operator 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 extension folding line L40 (see fig. 23). The distal end side of the extension portion 82 is bonded to the proximal end side with a double-sided tape, thereby constituting the extension portion 82 having a double-layer laminated structure.

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

< second Process >

Next, the operator connects the first blank 4A and the end wall body 61 (second step). The worker attaches a double-sided tape to the back paper 5C of the connecting sheet 80 of each end wall body 61. Next, the operator bonds the connecting pieces 80 of the pair of end wall bodies 61 to the front paper 5B of the back wall 65 of the first blank 4A (see fig. 24). The pair of connection pieces 80 are adhered to the left and right sides of the back wall 65 with their distal ends aligned with the adhesion marks M5 (see fig. 23).

Accordingly, the second step is completed, and the pair of end walls 61 and the back surface wall 65 are connected (see fig. 23).

< third step >

Next, the operator connects the second blank 4B (the upper bottom wall 60B) to the lower bottom wall 60A of the first blank 4A (a third step). The worker attaches a double-sided tape to the inner paper 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 in a state where the upper mark M6 of the upper bottom wall 60B is 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 with the double-sided tape in a posture in which the pair of second notch portions 77A face the pair of outer sheet portions 70. The front end (front edge) of the upper bottom wall 60B is spaced rearward from the sidewall 12 (first fold line L1). The four laminated holes 67 opened in the lower bottom wall 60A are positioned in the four column notches 76 in the upper bottom wall 60B.

Accordingly, the third step is completed, and the bottom wall body 60 having a double-layer laminated structure in which the lower bottom wall 60A and the upper bottom wall 60B are laminated is formed. Thus, the connection step is ended. In this state, the corrugated paper 5A of the lower bottom wall 60A and the corrugated paper 5A of the upper bottom wall 60B extend in a direction orthogonal to each other. The engaging 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. A pair of second engaging recesses 77 are formed in a range surrounded by the upper surface of the lower bottom wall 60A and the pair of second notches 77A. The pair of second engaging recesses 77 are formed to be recessed on both left and right sides of the upper surface of the bottom wall body 10.

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

[ Assembly procedure ]

Next, an assembly process of the stack tray 4 will be described with reference to fig. 20, 24 to 27. Fig. 25 is a perspective view showing an assembling process of the end wall body 61 and the like. Fig. 26 is an enlarged perspective view of the support 81A and the like. Fig. 27 is a perspective view illustrating an assembly process of the stack tray 4. Here, a case where the worker performs the assembling process by manual work will be described.

The stack tray 4 is assembled by appropriately bending the joined first blank 4A, second blank 4B, and third blank 4C. As shown in fig. 25, the worker bends the back wall 65 upward along the first folding line L1 to set the back wall 65 in a substantially vertically standing posture. Next, the operator bends the pair of left and right outer end walls 30 forward along the side folding line L11 to be substantially perpendicular. The end wall body 61 (outer end wall 30) is disposed in a standing posture at a peripheral edge portion (short side) of the bottom wall body 60.

As shown in fig. 24, in accordance with the bending of the outer end wall 30, the contact wall 84 of the rear support wall 81 is pressed against the back wall 65 and bent at the fourth bending line L43, and the main body wall 83 is pushed inward while being bent concavely at the first bending line L15 and convexly at the second bending line L41 (see the broken-line arrow in fig. 24). Then, as shown in fig. 26, the supporting wall 81 bends the main body wall 83 concavely at a first bending line L15 and convexly at a second bending line L41, and bends the contact wall 84 convexly at a third bending line L42 and convexly at a fourth bending line L43 to form a pillar 81A having a rectangular cross section. The support 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 of being convexly folded at the third folding line L42. The fixing wall 85 is fixed to the outer end wall 30 along the side folding line L11 in a state where the contact wall 84 is folded convexly at the third folding line L42. The main body wall 83 is bent substantially in an L-shape at a second bending line L41. The diagonal wall 86 is configured in a state in which the fifth bending line L44 is convexly bent and extends toward the third bending line L42. That is, the diagonal wall 86 is disposed on a diagonal line of the rectangular cross section of the strut 81A. Thus, the square tubular support column 81A is formed by rolling in the support wall 81. The upper end surface of each support wall 81 (support column 81A) is formed substantially on the same plane as the uppermost end surface of the end wall body 61 and the rear wall 65. The stacking projection 88 of each of the diagonal walls 86 projects upward from the upper end surface of the support 81A.

Next, as shown in fig. 25, the worker bends the pair of left and right outer sheet portions 70 upward along the third folding line L30 at substantially right angles. The outer piece 70 is provided in a state of extending 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).

Next, the operator folds the pair of left and right frame portions 71 and the pair of left and right inner pieces 72 along the two frame folding lines L31 into the lower portion of the end wall body 61. The frame portion 71 is disposed above the lower edge portion of the end opening portions 30A and 34A through the end opening portions 30A and 34A. The inner sheet portion 72 is folded back downward with respect to the outer sheet portion 70, and the lower portion of the end wall body 61 is sandwiched between the inner sheet portion and the outer sheet portion 70.

Next, the operator bends the pair of left and right second engaging convex portions 73 along the second fitting bending line L32, and fits the pair of left and right second engaging convex portions 73 into the pair of left and right second engaging concave portions 77. The second engaging protrusion 73 is bent substantially at a right angle to the inner piece 72 and is positioned along the upper surface of the bottom wall 60. The second engaging convex portion 73 is fitted (engaged) with the second engaging concave portion 77 in a posture along the bottom wall body 60 in a state where the lower portion of the end wall body 61 is sandwiched by the outer piece portion 70 and the inner piece portion 72. The second engaging convex portion 73 forms a plane substantially identical to the upper surface of the bottom wall body 60 (the upper bottom wall 60B) in a state of being fitted in the second engaging concave portion 77.

Next, as shown in fig. 27, the operator inwardly bends the pair of left and right outer edge walls 31 along the side folding line L11 at substantially right angles. The outer edge wall 31 and the extension 82 are provided in a state of extending from the side end portion of the outer end wall 30 toward the side wall body 12. With this bending of the outer edge wall 31, the contact wall 84 of the front support wall 81 is pushed out toward the outer edge wall 31 and is bent at the fourth bending line L43, and the main body wall 83 is pushed out inward while being bent concavely at the first bending line L15 and convexly at the second bending line L41. The front support wall 81 forms a pillar 81A having a rectangular cross section, similarly to the rear support wall 81. The diagonal wall 86 is disposed on a diagonal of the rectangular cross section of the strut 81A.

Next, the operator inwardly bends the pair of left and right second extending portions 74 along the extension bending line L33 at substantially right angles. The second extension portion 74 is overlapped on the outer surface of the extension portion 82 and is provided in a state of extending toward the side wall body 12.

Next, as shown in fig. 20, the operator bends the outer panel section 20 upward along the first fold line L1 at a substantially right angle, and bends the upper panel edge section 21 and the inner panel section 22 along the two second fold lines 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. Next, the operator bends the engaging convex portion 23 along the fitting bending line L3 to fit it into the engaging concave portion 25 (see fig. 9 and the like).

Accordingly, the assembly operation of the stack tray 4 is completed (see fig. 20). In this state, the corrugated paper 5A such as the end wall body 61 extends in the vertical direction.

[ laminating Effect ]

Next, a stacking function of the stack tray 4 will be briefly described. The stacking function of the stack tray 4 is substantially the same as that of the stack tray 1 according to the first embodiment, and the bottom wall body 60 of the upper stack tray 4 is placed on the four support columns 81A of the lower stack tray 4, whereby a plurality of stack 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 into the stacking holes 67 (not shown) of the upper stacking tray 4 from below. The tip end surface of the lamination projection 88 passes through the lamination hole 67 and contacts the lower end surface (not shown) of the curved recess 87.

In the stack tray 4 according to the fourth embodiment described above, the second engaging convex portion 73 is configured to be fitted (engaged) with the second engaging concave portion 77 (see fig. 20) in a posture substantially parallel to the bottom wall body 60 in a state where the lower portion of the end wall body 61 is sandwiched. According to this configuration, when a force that causes the end wall body 61 to tilt outward acts, the end piece body 66 rotates outward so as to be spread, and the tip end of the second engaging convex portion 73 abuts against the inner surface of the second engaging concave portion 77 (the cross section of the second notched portion 77A). Then, the second engaging convex portion 73 is less likely to be disengaged from the second engaging concave portion 77, and therefore, the end piece 66 can be prevented from being unfolded. Accordingly, the end sheet body 66 can be maintained in a state of sandwiching the end wall body 61, and the standing posture of the end wall body 61 can be maintained. In this way, since the engagement action of the second engaging convex portion 73 and the second engaging concave portion 77 is exerted in addition to the engagement action of the engaging convex portion 23 and the engaging concave portion 25, the effect of maintaining the assembled state of the stack tray 4 can be enhanced.

In the stacking tray 4 according to the fourth embodiment, the second extension portion 74 is configured to be clamped to the double-walled sidewall 12 together with the extension portion 82. According to this configuration, when a force that causes end wall body 61 to tilt outward acts, second extension portion 74 is lifted up on side wall body 12, and side wall body 12 is rotated outward so as to be unfolded. Then, the tip of the engaging convex portion 23 is brought into contact with the inner surface of the engaging concave portion 25, in addition to the tip of the second engaging convex portion 73 being brought into contact with the inner surface of the second engaging concave portion 77. This can disperse the force of tilting the end wall body 61 outward, and as a result, the assembled state of the stack tray 4 can be maintained.

In the stacking tray 4 according to the fourth embodiment, the stacking projection 88 projects upward from the upper end surface of the support column 81A, and the stacking hole 67 opens in the bottom wall body 60. According to this configuration, when a plurality of stack trays 4 are stacked, the stacking projection 88 of the lower stack tray 4 is inserted into the stacking hole 67 of the upper stack tray 4, and therefore, the horizontal positional displacement of the stacked stack trays 4 can be suppressed. This can maintain the stacked state of the plurality of stacking trays 4 appropriately. Further, since the stacking projection 88 is disposed inside the support column 81A, the stacking projection 88 can be prevented from interfering with the commodities and the like placed on the bottom wall body 60.

In the stack tray 4 according to the fourth embodiment, the second engaging convex portion 73 and the second engaging concave portion 77 are formed in a substantially rectangular shape, but the present invention is not limited thereto. For example, the second engaging convex portion 73 and the second engaging concave portion 77 may be formed in a substantially trapezoidal shape (see fig. 6 and 18A), a concave-convex shape (see fig. 18B), a triangular shape (not shown), or the like, similarly to the engaging convex portion 23 and the engaging concave portion 25 of the stack tray 1 according to the first embodiment to the stack tray 3 according to the third embodiment. The size (length) and the number of the second engaging convex portions 73 and the second engaging concave portions 77 may be changed as appropriate (see fig. 19A and 19B).

In the stack tray 4 according to the fourth embodiment, the lower portion of the end wall body 61 is sandwiched between the inner sheet portion 72 and the outer sheet portion 70, but the present invention is not limited to this. At least a part of end wall 61 may be sandwiched between inner sheet 72 and outer sheet 70, and for example, the entire end wall 61 may be sandwiched therebetween.

In the stack tray 4 according to the fourth embodiment, the second extension portion 74 is provided to be connected to the outer sheet portion 70 of the end sheet 66, but the present invention is not limited thereto, and the second extension portion 74 may be omitted. In this case, the outer sheet portion 70 may be formed to have the same width as the inner sheet portion 72 and the like.

In the stack tray 4 according to the fourth embodiment, the stacking projection 88 has a curved convex shape, but the present invention is not limited to this. The size and shape of the stacking projection 88 can be changed as appropriate. In addition, in the stack tray 4, four stacking projections 88 are formed, but the present invention is not limited to this, and for example, a pair of stacking projections 88 may be formed on a pair of support walls 81 that are diagonal corners. The lamination holes 67 may be formed so as to match the shape, number, and the like of the lamination protrusions 88.

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

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

In the stack trays 1 to 4 according to the first to fourth embodiments, the engaging concave portions 25 (the notch portions 25A) are formed in substantially the same shape as the engaging convex portions 23, but the present invention is not limited thereto. For example, the engaging convex portion 23 may be formed slightly smaller than the engaging concave portion 25 (not shown). That is, the protruding dimension of the engaging convex portion 23 may be set shorter than the front-rear width (notch opening depth) of the engaging concave portion 25 (notch portion 25A). In this case, in a state where the engaging convex portion 23 is engaged with (disposed in) the engaging concave portion 25, a minute gap is formed between the tip end of the engaging convex portion 23 and the inner surface of the engaging concave portion 25 (the cross section of the notched portion 25A). It is preferable that the gap is a gap enough to allow the tip of the engaging convex portion 23 to abut against the inner surface of the engaging concave portion 25 when the side wall body 12 is rotated so as to be unfolded. In the stack tray 4 according to the fourth embodiment, the second engaging convex portion 73 may be formed slightly smaller than the second engaging concave portion 77 (not shown) as in the above.

In the stacking tray 4 according to the first to fourth embodiments, the support walls 35 and 81 are continuous with the end wall bodies 11, 51, and 61, but the present invention is not limited to this. For example, the support walls 35 and 81 may be formed of a separate member from the end wall bodies 11, 51 and 61. In this case, it is preferable to form the square tubular support columns 35A and 81A by bending the support walls 35 and 81, and then bond the support columns 35A and 81A to the end wall bodies 11, 51, 61, and the like.

In the stacking tray 1 according to the first embodiment to the stacking tray 4 according to the fourth embodiment, the four support columns 35A and 81A (the four support walls 35 and 81) are formed, but the present invention is not limited to this. For example, three or more support columns 35A, 81A are preferably provided to stably support the upper stacking trays 1-4. For example, when the upper end surfaces of the support columns 35A and 81A can be surely widened (enlarged) by forming the support columns 35A and 81A in a wall shape, the number of the support columns 35A and 81A may be two. The support columns 35A and 81A are formed in a square tubular shape having a substantially rectangular cross section, but the present invention is not limited thereto. For example, the cylindrical member may be formed in a square cylinder shape having a polygonal cross section of a triangle, a pentagon or more, or may be formed in a cylindrical shape having a substantially circular (elliptical) cross section (not shown).

In the stacking tray 4 according to the first to fourth embodiments, the end wall bodies 11, 51, 61 are formed higher than the side wall body 12, but the present invention is not limited thereto, and may be formed to have substantially the same height as the side wall body 12, for example. In the stacking tray 1 according to the first embodiment to the stacking tray 3 according to the third embodiment, the upper end surface of the column 35A is provided below the upper end surface of the inner end wall 34 or the like, but the present invention is not limited to this, and may be formed at substantially the same position as the upper end surface of the inner end wall 34 or the like, for example. 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 the present invention is not limited thereto, and may be provided below the upper end surface of the end wall body 61, for example.

In the stack trays 1 to 3 according to the first to third embodiments, the side edges (the side folding line L11, the first folding line L15, and the like) of the outer end wall 30 and the inner end wall 34 are inclined outward by about 1 degree with respect to the corrugated paper 5A (the line extending orthogonal to the lower folding line L10), but the angle is not limited thereto, and may be appropriately changed depending on, for example, the height of the end wall body 11. For example, when the upper end surface of the support 35A is formed substantially flush with the upper end surface of the inner end wall 34 or the like, the end wall body 11 (the outer end wall 30 and the inner end wall 34) may be formed in a rectangular shape having a substantially uniform width from the lower side to the upper side or in a substantially trapezoidal shape having a width gradually narrowing from the lower side to the upper side when viewed from the end surface side. Further, the side end of the end wall body 61 of the stack tray 4 according to the fourth embodiment may be inclined outward.

In the stacking tray 4 according to the first to fourth embodiments of the present invention, the bottom wall bodies 10, 50, and 60 are formed in a substantially rectangular shape, and the pair of end wall bodies 11, 51, and 61 and the pair of side wall bodies 12 are circumferentially arranged offset by substantially 90 degrees. For example, the bottom wall bodies 10, 50, 60 may be formed in a polygonal shape other than a rectangular shape such as a triangle, a pentagon, or a hexagon, a circular shape (oval shape), or the like (not shown). In this case, the end walls 11, 51, 61 and the side wall 12 are preferably disposed adjacent to each other on the peripheral edge portions of the bottom walls 10, 50, 60.

The stack tray 4 according to the first to fourth embodiments (except for the modification of the third embodiment) is formed of double-faced corrugated paper made of paper, but is not limited thereto, and may be formed of corrugated paper board made of paper such as single-faced corrugated paper, multi-faced corrugated paper, or various corrugated paper boards made of heavy paper or resin.

The above embodiments are described as 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 embodiments.

Description of the reference numerals

1-4: stacking trays (packing cases); 5A: corrugated paper; 5B: a cover sheet (mount sheet); 5C: lining paper (lining paper); 10. 50, 60: a bottom wall body; 10A, 50A, 60A: a lower bottom wall; 10B, 40B, 50B, 60B: an upper bottom wall; 10C, 40C: an intermediate bottom wall; 11. 51, 61: an end wall body; 12: a sidewall body; 20: an outer plate portion; 22: an inner plate portion; 23: a snap-fit protrusion; 24: a clamping piece part; 25: a clamping concave part; 25A: a notch portion; 30: an outer end wall; 31: an outer edge wall; 32: a first fold-back wall; 33: a second fold back wall; 34: an inner end wall; 35. 81: a support wall; 35A, 81A: a pillar; 36: an inner edge wall; 37. 82: an extension; 37A: an outer extension portion (extended portion); 37B: an inner extension portion (extended portion); 38: a clamping groove; 66: an end piece body; 67: laminating the holes; 70: an outer sheet portion; 72: an inner sheet portion; 73: a second engaging projection; 74: a second extension; 77: a second engaging recess; 83: a body wall; 84: a contact wall; 85: a fixed wall; 86: a diagonal wall; 88: a stacking protrusion; l12: a first folded back line; l13, L41: a second folded line; l14, L42: a third folded loop; l15: a first bend line; l16: a second bend line; l17: a third bend line; l43: a fourth bend line; l44: a fifth bend line.

Claims (20)

1. The utility model provides a can range upon range of a plurality of packing box (1 ~ 2) from top to bottom which characterized in that has:

a bottom wall body (10), an end wall body (11) and a side wall body (12), wherein,

the bottom wall body (10) includes a snap-in recess (25) formed in a recessed state on a surface thereof;

the end wall body (11) is arranged at the peripheral edge part of the bottom wall body in a standing posture;

the side wall body (12) is offset in the circumferential direction with respect to the end wall body, and is disposed in a peripheral portion of the bottom wall body in a standing posture at a position adjacent to the end wall body,

the end wall body comprises an outer end wall (30), an outer edge wall (31), a first folded back wall (32), a second folded back wall (33), an inner end wall (34), a support wall (35), an inner edge wall (36) and an extension (37), wherein,

the outer end wall (30) is disposed in a peripheral edge portion of the bottom wall body in a standing posture;

the outer edge wall (31) is provided in a state of extending from a side end portion of the outer end wall toward the side wall body;

the first folding wall (32) is set in a state of being connected to the side end portion of the outer edge wall through a first folding line (L12);

the second folding wall (33) is set in a state of being connected to the upper end portion of the outer edge wall through a second folding line (L13);

the inner end wall (34) overlapping an inner surface of the outer end wall;

the support wall (35) is provided in a state of protruding inward;

the inner rim wall (36) overlapping the inner surface of the outer rim wall;

the extension (37) is provided in a state of extending toward the sidewall;

the extension portion is provided in a state of being connected to a distal end portion of at least one of the outer edge wall and the inner edge wall,

the support wall is disposed in a state of being connected to the inner end wall by a first bending line (L15) and in a state of being connected to the inner edge wall by a second bending line (L16), and includes a third bending line (L17) extending parallel to the first and second bending lines between the first and second bending lines,

the support wall is concavely folded at the first folding line by folding the inner edge wall concavely at the second folding line, and is convexly folded while pushing the third folding line inward to form a pillar (35A) having a rectangular cross section,

the inner end wall is arranged to be overlapped on the inner surface of the outer end wall by being folded back to the inner side along a third folded back line (L14) in a state of being connected to the upper end portion of the outer end wall by the third folded back line,

the first folded back wall is overlapped in a state of being folded back to the inner side along the first folded back line and fixed to the inner edge wall overlapped with the inner surface of the outer edge wall,

the second folded back wall is overlapped and fixed to an inner surface of the outer edge wall in a state of being folded back to the inner side along the second folded back line,

the side wall body comprises an outer plate part (20), an inner plate part (22) and a clamping convex part (23),

the outer plate (20) is provided in a state of extending upward from the peripheral edge of the bottom wall;

the inner plate (22) is folded downward relative to the outer plate so as to cover the upper part of the extension portion, and the extension portion is sandwiched between the inner plate and the outer plate;

the engaging convex portion (23) is provided in a state of being connected to the distal end portion of the inner plate portion, and is engaged with the engaging concave portion in a posture along the bottom wall body in a state of sandwiching the extension portion between the outer plate portion and the inner plate portion.

2. The packaging case according to claim 1,

an engaging piece (24) is formed at the side end of the inner plate, and the engaging piece (24) engages with an engaging groove (38) formed in the end wall body in a state where the engaging convex portion is engaged with the engaging concave portion.

3. The packaging case according to claim 1,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the bottom wall body comprises a lower bottom wall (10A, 50A) and an upper bottom wall (10B, 40B, 50B), wherein,

the lower bottom wall (10A, 50A) is formed in a state of being connected to the outer panel portion,

the upper bottom wall (10B, 40B, 50B) is formed separately from the lower bottom wall, is disposed above the lower bottom wall, and is formed with a notch portion (25A) constituting the engagement recess,

the corrugated paper of the lower bottom wall and the corrugated paper of the upper bottom wall extend in directions intersecting each other.

4. The packaging case according to claim 3,

the bottom wall body further includes an intermediate bottom wall (10C, 40C) formed in a state of being connected to the end wall body,

the intermediate bottom wall is formed separately from the lower bottom wall and the upper bottom wall, and is fixed in a state of being sandwiched between the lower bottom wall and the upper bottom wall.

5. The packaging case according to claim 1,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the corrugated paper of the end wall body, the outer plate portion, and the inner plate portion extends in the vertical direction.

6. The packaging case according to claim 1,

the upper end surface of the support wall is disposed below the uppermost end surface of the end wall body,

the end wall body (11) is formed so that the width thereof gradually increases from below to above.

7. The packaging case according to claim 1,

a laminated protrusion (88) protruding upward from an upper end is formed on the support wall,

a stacking hole (67) into which the stacking projection of the lower packaging box is inserted when a plurality of packaging boxes are stacked is formed in the bottom wall body.

8. A plurality of packing cases (4) which can be stacked up and down, characterized by comprising:

a bottom wall body (60), an end wall body (61), a side wall body (12) and an end sheet body (66), wherein,

the bottom wall body (60) includes a snap-fit concave portion (25) formed in a recessed state on a surface thereof;

the end wall body (61) is disposed at the peripheral edge of the bottom wall body in a standing posture;

the side wall body (12) is offset in the circumferential direction with respect to the end wall body, and is disposed in a peripheral edge portion of the bottom wall body in a standing posture at a position adjacent to the end wall body;

the end piece body (66) is set in a state of being connected with the peripheral edge part of the bottom wall body for configuring the end wall body (61),

on the surface of the bottom wall body, a second engaging recess (77) is formed in a recessed state on the side of the end wall body,

the end wall body comprises a support wall (81) and an extension (82), wherein,

the support wall (81) is set in a state of protruding towards the inner side;

the extension (82) is provided in a state of extending toward the sidewall,

the side wall body comprises an outer plate part (20), an inner plate part (22) and a clamping convex part (23),

the outer plate (20) is provided in a state of extending upward from the peripheral edge of the bottom wall;

the inner plate (22) is folded downward relative to the outer plate so as to cover the upper part of the extension portion, and the extension portion is sandwiched between the inner plate and the outer plate;

the engaging convex portion (23) is provided in a state of being connected to the front end portion of the inner plate portion, and is engaged with the engaging concave portion in a posture along the bottom wall body in a state of sandwiching the extension portion between the outer plate portion and the inner plate portion,

the end piece body comprises an outer piece part (70), an inner piece part (72) and a second clamping convex part (73), wherein,

the outer sheet part (70) is arranged in a state of extending upwards from the peripheral part of the bottom wall body and is overlapped on the outer surface of the end wall body;

the inner sheet (72) is folded downward relative to the outer sheet and at least a part of the end wall body is sandwiched between the inner sheet and the outer sheet;

the second engaging convex portion (73) is provided in a state of being connected to the distal end portion of the inner piece portion, and is engaged with the second engaging concave portion in a posture along the bottom wall body in a state of sandwiching at least a part of the end wall body by the outer piece portion and the inner piece portion,

a second extension (74) is provided at the side end of the outer sheet part in a state of being connected thereto,

the second extension portion is sandwiched between the outer plate portion and the inner plate portion together with the extension portion in a state of extending toward the sidewall body.

9. The packaging case according to claim 8,

an engaging piece (24) is formed at the side end of the inner plate, and the engaging piece (24) engages with an engaging groove (38) formed in the end wall body in a state where the engaging convex portion is engaged with the engaging concave portion.

10. The packaging case according to claim 8,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the bottom wall body comprises a lower bottom wall (10A, 50A) and an upper bottom wall (10B, 40B, 50B), wherein,

the lower bottom wall (10A, 50A) is formed in a state of being connected to the outer panel portion,

the upper bottom wall (10B, 40B, 50B) is formed separately from the lower bottom wall, is disposed above the lower bottom wall, and is formed with a notch portion (25A) constituting the engagement recess,

the corrugated paper of the lower bottom wall and the corrugated paper of the upper bottom wall extend in directions intersecting each other.

11. The packaging case according to claim 10,

the bottom wall body further includes an intermediate bottom wall (10C, 40C) formed in a state of being connected to the end wall body,

the intermediate bottom wall is formed separately from the lower bottom wall and the upper bottom wall, and is fixed in a state of being sandwiched between the lower bottom wall and the upper bottom wall.

12. The packaging case according to claim 8,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the corrugated paper of the end wall body, the outer plate portion, and the inner plate portion extends in the vertical direction.

13. The packaging case according to claim 8,

the upper end surface of the support wall is disposed below the uppermost end surface of the end wall body,

the end wall body (61) is formed so that the width thereof gradually increases from below to above.

14. The packaging case according to claim 8,

a laminated protrusion (88) protruding upward from an upper end is formed on the support wall,

a stacking hole (67) into which the stacking projection of the lower packaging box is inserted when a plurality of packaging boxes are stacked is formed in the bottom wall body.

15. A plurality of packing cases (4) which can be stacked up and down, characterized by comprising:

a bottom wall body (60), an end wall body (61) and a side wall body (12), wherein,

the bottom wall body (60) includes a snap-fit concave portion (25) formed in a recessed state on a surface thereof;

the end wall body (61) is disposed at the peripheral edge of the bottom wall body in a standing posture;

the side wall body (12) is offset in the circumferential direction with respect to the end wall body, and is disposed in a peripheral portion of the bottom wall body in a standing posture at a position adjacent to the end wall body,

the end wall body comprises an outer end wall (30), an outer edge wall (31), an inner end wall (34), a support wall (81) and an extension (82), wherein,

the outer end wall (30) is disposed in a peripheral edge portion of the bottom wall body in a standing posture;

the outer edge wall (31) is connected to the side end portion of the outer end wall by a side folding line (L11), and is provided in a state of extending from the side end portion of the outer end wall toward the side wall body;

the inner end wall (34) being overlapped with an inner surface of the outer end wall;

the support wall (81) is set in a state of protruding towards the inner side;

the extension (82) is provided in a state of extending toward the sidewall;

the extension portion is provided in a state of being connected to a distal end portion of the outer edge wall,

the support wall (81) includes a main body wall (83), a contact wall (84), a fixing wall (85), and a diagonal wall (86), wherein,

the main body wall (83) is provided in a state of being connected to the inner end wall by a first bend line (L15), and has a second bend line (L41) extending in parallel with the first bend line;

the contact wall (84) is set in a state of being connected to the main body wall by a third folding line (L42);

the fixing wall (85) is provided in a state of being connected to the contact wall by a fourth folding line (L43), and is fixed to the outer end wall along the side folding line in a state of being folded convexly at the third folding line;

the diagonal wall (86) is provided in a state of being connected to the fixed wall by a fifth fold line (L44), and has a laminated protrusion (88) protruding upward of the main body wall,

the supporting wall enables the main body wall to be concavely folded at the first bending line and convexly folded at the second bending line, enables the contact wall to be convexly folded at the third bending line and convexly folded at the fourth bending line to form a pillar (81A) with a rectangular cross section,

the diagonal wall is configured in a state of being convexly folded at the fifth folding line and extending toward the third folding line,

the stacking projection portion projects above the upper end surface of the pillar,

a stacking hole (67) into which the stacking protrusion of the lower packaging box is inserted when a plurality of packaging boxes are stacked is formed in the bottom wall body,

the side wall body comprises an outer plate part (20), an inner plate part (22) and a clamping convex part (23),

the outer plate (20) is provided in a state of extending upward from the peripheral edge of the bottom wall;

the inner plate (22) is folded downward relative to the outer plate so as to cover the upper part of the extension portion, and the extension portion is sandwiched between the inner plate and the outer plate;

the engaging convex portion (23) is provided in a state of being connected to the distal end portion of the inner plate portion, and is engaged with the engaging concave portion in a posture along the bottom wall body in a state of sandwiching the extension portion between the outer plate portion and the inner plate portion.

16. The packaging case according to claim 15,

an engaging piece (24) is formed at the side end of the inner plate, and the engaging piece (24) engages with an engaging groove (38) formed in the end wall body in a state where the engaging convex portion is engaged with the engaging concave portion.

17. The packaging case according to claim 15,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the bottom wall body comprises a lower bottom wall (10A, 50A) and an upper bottom wall (10B, 40B, 50B), wherein,

the lower bottom wall (10A, 50A) is formed in a state of being connected to the outer panel portion,

the upper bottom wall (10B, 40B, 50B) is formed separately from the lower bottom wall, is disposed above the lower bottom wall, and is formed with a notch portion (25A) constituting the engagement recess,

the corrugated paper of the lower bottom wall and the corrugated paper of the upper bottom wall extend in directions intersecting each other.

18. The packaging case according to claim 17,

the bottom wall body further includes an intermediate bottom wall (10C, 40C) formed in a state of being connected to the end wall body,

the intermediate bottom wall is formed separately from the lower bottom wall and the upper bottom wall, and is fixed in a state of being sandwiched between the lower bottom wall and the upper bottom wall.

19. The packaging case according to claim 15,

the packing case is formed by a corrugated board formed by pasting lining paper (5B, 5C) on corrugated paper (5A),

the corrugated paper of the end wall body, the outer plate portion, and the inner plate portion extends in the vertical direction.

20. The packaging case according to claim 15,

the upper end surface of the support wall is disposed below the uppermost end surface of the end wall body,

the end wall body (61) is formed so that the width thereof gradually increases from below to above.

Images