JP6938358B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box capable of protecting the corners of the contents.

For example, Patent Document 1 discloses a corner cushioning material having a cylindrical outer frame having a rectangular cross section. The two stacked plate-shaped objects (contents) are wrapped in two upper and lower cover materials with their corners covered with a corner cushioning material. The packaged object and the two cover materials are bound by a binding material. In this state, the corners of the packaged object are doubly covered and protected by the corner cushioning material and the two cover materials.

JP-A-2007-320654

However, the worker who wraps the packaged object must place the packaged object on the lower cover material and then attach a corner cushioning material to the corner of the packaged object, which is a packaging operation (sealing operation). There was a problem that it took time and effort. Further, since the corner cushioning material is a separate member from the two cover materials, it is necessary to manufacture and store a plurality of different members, and there is also a problem that it takes time and cost to manage these members. .. Further, after the packaged object is taken out (after opening), the corner cushioning material and the two cover materials become separate wastes, so that there is a problem that it takes time and effort to collect the wastes.

In order to solve the above-mentioned problems, the present invention provides a packaging box capable of easily forming a structure for protecting the corners of the contents and facilitating disposal after opening.

In order to achieve the above object, the packaging box of the present invention is connected to a bottom wall on which the contents formed in a plate shape or a hexahedron shape are arranged, and both ends of the bottom wall in the first direction. A pair of first walls facing both side surfaces of the contents in the first direction arranged on the bottom wall and both ends of the bottom wall in the second direction intersecting with the first direction are connected to the bottom wall. A pair of second walls facing both side surfaces of the contents arranged in the second direction and the contents arranged at at least one tip of the pair of first walls and arranged on the bottom wall. It is connected to the top wall facing the top surface of an object and the side portion of the top wall in the second direction, and is bent so as to overlap the bottom wall, the first wall, the second wall, and the inner surface of the top wall. A corner pad that is arranged between each of the bottom wall, the first wall, the second wall, and the top wall and the corner portion of the content to protect the corner portion of the content. It has.

In this case, the pair of first walls are connected to both ends of the bottom wall in the first direction via a first folding curve, and the pair of second walls are both ends of the bottom wall in the second direction. The top wall is connected to the portion via the second folding curve, the top wall is connected to the tip of the first wall via the third folding curve, and the corner pad portion is connected to the third folding curve from the third folding curve. A cut line cut inward from the side end of the top wall in the second direction at a position separated from the tip side of the top wall, and from the end of the third folding curve to the tip of the cut line. A top surface protection portion formed between a folding line extending diagonally toward the top and a first side surface connected to an end portion of the top surface protection portion in the second direction via a first folding line. A protective portion, a bottom surface protection portion connected to the end of the first side surface protection portion in the second direction via a second folding line, and a third folding portion on the side of the second wall of the bottom surface protection portion. The first side surface is in a state in which the top surface protection portion is folded back along the folding line and overlapped with the inner surface of the top wall, including a second side surface protection portion connected via a wire. The protection portion was superposed on the inner surface of the first wall at a position corresponding to the third folding curve of the first folding line, and the bottom surface protecting portion made the second folding line correspond to the first folding curve. It is preferable that the second side surface protection portion is overlapped on the inner surface of the bottom wall at a position, and the second side surface protection portion is overlapped on the inner surface of the second wall at a position corresponding to the second folding curve.

In this case, the pair of first walls are connected to both ends of the bottom wall in the first direction via a first folding curve, and the pair of second walls are both ends of the bottom wall in the second direction. The top wall is connected to the portion via the second folding curve, the top wall is connected to the tip of the first wall via the third folding curve, and the corner pad portion is connected to the top wall in the second direction. A second side surface protection portion having a folding line formed in parallel with the first folding line at the end portion of the second side surface protection portion and a second direction of the second side surface protection portion. A top surface protection portion connected to the end of the top surface protection portion via a second folding line, and a first side surface connected to the side of the second wall of the top surface protection portion via a third folding line. The second side surface protection portion includes a protection portion and a bottom surface protection portion connected to the side of the second wall of the first side surface protection portion via a fourth folding line, and the second side surface protection portion is along the folding line. In the state of being folded back and doubled, the top surface protection portion is overlapped with the inner surface of the top wall at a position corresponding to the first folding line, and the first side surface protection portion. Is superposed on the inner surface of the first wall at a position corresponding to the third folding curve, and the bottom surface protection portion is a position corresponding to the first folding curve of the fourth folding line. The second side surface protection portion, which is overlapped on the inner surface of the bottom wall and is arranged between the top surface and the top surface of the contents, is the double-layered second side surface protection portion. It is preferable that the first folding line and the second folding line are bent and arranged between the side surface of the corner portion of the content in the second direction and the second wall.

In this case, the pair of top walls are connected to the tip of the pair of first walls, and the four corners of the contents are protected on both sides of the pair of top walls in the second direction. It is preferable that the four corner pads are connected in series.

In this case, it is preferable that the pair of top walls are formed with an engaging portion that engages the pair of top walls with each other and maintains the pair of top walls in a state of facing the top surface of the contents.

In this case, it is preferable to further provide a lid wall that is connected to at least one tip of the pair of second walls and is overlapped with the top wall facing the top surface of the contents.

In this case, it is preferable that the top wall and the lid wall are formed with a lock structure for fixing the lid wall in a state of being overlapped with the top wall.

According to the present invention, a structure that protects the corners of the contents can be easily formed in the packaging box. In addition, it is possible to facilitate disposal of the packaging box after opening.

It is a perspective view which shows the packaging box which concerns on 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 1st Embodiment of this invention. It is a top view which shows the part of the blank of the packaging box which concerns on 1st Embodiment of this invention in an enlarged manner. It is a perspective view which shows the state which the corner pad portion of the packaging box which concerns on 1st Embodiment of this invention is folded back. It is a top view which shows one corner pad part of the packaging box which concerns on 1st Embodiment of this invention in an enlarged manner. It is a perspective view which shows the state which covered the contents with the top wall of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view which shows the process of fixing the lid wall of the packaging box which concerns on 1st Embodiment of this invention to a top wall. It is a top view which enlarges and shows one corner pad part of the packaging box which concerns on the modification of 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 2nd Embodiment of this invention. It is a top view which shows the part of the blank of the packaging box which concerns on 2nd Embodiment of this invention in an enlarged manner. It is a perspective view which shows the state which the corner pad portion of the packaging box which concerns on 2nd Embodiment of this invention is folded back. It is a top view which shows one corner pad part of the packaging box which concerns on 2nd Embodiment of this invention in an enlarged manner. It is a top view which shows a part of the state which covered the contents with the top wall of the packaging box which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawing, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates "U". "Upper" and "D" indicate "lower". The front-rear direction (first direction) is orthogonal (intersects) to the left-right direction (second direction), and the vertical direction is orthogonal (intersects) to the front-rear direction and the left-right direction. Although terms indicating directions and positions are used in the present specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[First Embodiment: Outline of packaging box]
The packaging box 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a packaging box 1. FIG. 2 is a plan view showing a blank 5 of the packaging box 1. FIG. 3 is an enlarged plan view showing a part of the blank 5.

As shown in FIG. 1, the packaging box 1 is a so-called squid-type box, and is formed in a rectangular parallelepiped shape flat in the vertical direction. The packaging box 1 is sealed by alternately erection of a pair of side walls 11 and a pair of end walls 12 on the four sides of the bottom wall 10 and closing the upper surface opening. The packaging box 1 contains the contents M formed in a rectangular plate shape (or hexahedron shape), such as a desk top plate. In this specification, terms such as the top surface, bottom surface, and side surface of the content M are used, but these do not mean the top surface, etc. in the state of use of the content M, but are in the state of being packaged in the packaging boxes 1 and 2. It is a concept based on the posture of the contents M in. Further, the top surface, the bottom surface, the side surface, and the like of the content M may be a flat surface, or may include a slope or a curved surface. Further, in the present specification, the term corner portion C of the content M is used, but the corner portion C is a concept including a shape in which a pair of side surfaces intersect and a corner protrudes, a shape in which the corner is chamfered, and the like. be.

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching a sheet of paper corrugated cardboard sheet by punching or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 4 and the like) are bonded to the front and back surfaces of a wavy corrugated cardboard 9A. Note that FIG. 2 shows the front liner 9B side (outer surface side of the packaging box 1). In the present specification, the direction parallel to the corrugated cardboard inner shin 9A is referred to as the "step direction", and the direction orthogonal to the step direction is referred to as the "flow direction". “X” shown in the drawing indicates “step direction”, and “Y” indicates “flow direction”.

As shown in FIG. 2, the blank 5 includes a bottom wall 10, a pair of side walls 11, a pair of end walls 12, a pair of top walls 13A and 13B, a pair of lid walls 14, and four corner pads. It is equipped with 15. A pair of side walls 11 as an example of the first wall are connected to both ends of the bottom wall 10 in the step direction (first direction) via a first folding curve 21. A pair of end walls 12 as an example of the second wall are connected to both ends of the bottom wall 10 in the flow direction (second direction) via a second folding curve 22. The pair of top walls 13A and 13B are continuously provided at the tip ends of the pair of side walls 11 via the third folding curve 23. The pair of lid walls 14 are continuously provided at the tip ends of the pair of end walls 12 via a fourth folding curve 24. The four corner pads 15 are connected to both sides of the top walls 13A and 13B in the flow direction. The first to fourth folding curves 21 to 24 are general-purpose ruled lines formed by crushing a corrugated cardboard sheet linearly in the thickness direction from the back liner 9C side, respectively.

<Bottom wall, side wall, end wall>
The bottom wall 10 is formed in a substantially rectangular shape that is long in the flow direction. Since the content M is arranged on the bottom wall 10, the dimensions of the bottom wall 10 are set according to the planar shape of the content M. Each of the pair of side walls 11 is formed in a substantially rectangular shape that is long in the flow direction. The step direction dimension (extension dimension) of the side wall 11 is set according to the thickness of the content M, and the flow direction dimension of the side wall 11 is set to be substantially the same as the flow direction dimension of the bottom wall 10. Each of the pair of end walls 12 is formed in a substantially rectangular shape that is long in the step direction. The flow direction dimension (extension dimension) of the end wall 12 is set to be substantially the same as the extension dimension of the side wall 11, and the step direction dimension of the end wall 12 is set to be substantially the same as the step direction dimension of the bottom wall 10. ing.

<Top wall, lid wall>
The pair of top walls 13A and 13B are each formed in a substantially rectangular shape long in the flow direction. The dimensions of the top walls 13A and 13B in the flow direction are set to be substantially the same as the dimensions of the side wall 11 in the flow direction. The dimension (extended dimension) of the front top wall 13A in the step direction is set shorter than the extending dimension of the rear top wall 13B. The pair of top walls 13A and 13B are formed so as to overlap each other in a sealed state. Each of the pair of lid walls 14 is formed in a substantially rectangular shape that is long in the step direction. The dimension (extended dimension) of the lid wall 14 in the flow direction is set to be longer than the extending dimension of the front top wall 13A and shorter than the extending dimension of the rear top wall 13B. Further, the dimension of the lid wall 14 in the step direction is set to be substantially the same as the dimension of the end wall 12 in the step direction. In this specification, for convenience of explanation, only arithmetic numbers are used as codes in the explanation common to the pair of top walls 13A and 13B.

(Engagement part)
An engaging portion 30 is formed at the tip portions of the pair of top walls 13A and 13B. The engaging portion 30 includes an engaging convex portion 31 formed near the center of the top wall 13A in the flow direction and an engaging concave portion 32 formed near the center of the top wall 13B in the flow direction. The engaging portion 30 has a function of engaging the pair of top walls 13A and 13B with each other and maintaining the state of facing the top surface of the content M.

The engaging convex portion 31 is formed between a pair of notched portions 31A cut from the tip end of the top wall 13A toward the base end. That is, the pair of notch portions 31A are recessed in the tip end portion of the top wall 13A, so that the engaging convex portion 31 is relatively convex. A substantially semicircular finger hook portion 31B is formed in a recessed state in the central portion of the tip of the engaging convex portion 31. A pair of first auxiliary ruled lines 25A are formed on the engaging convex portion 31 so as to be inclined in a substantially V shape from the tips on both sides in the flow direction toward the base end. Further, the engaging convex portion 31 is formed with a second auxiliary ruled line 25B extending from the intersection of the pair of first auxiliary ruled lines 25A to the finger hook portion 31B. The first and second auxiliary ruled lines 25A and 25B are general-purpose ruled lines.

The engaging recess 32 is formed in a state of being recessed from the tip end of the top wall 13B toward the base end. The maximum dimension of the engaging recess 32 in the flow direction is set to be longer than the maximum dimension of the engaging convex portion 31 in the flow direction and shorter than the maximum distance between the pair of notches 31A.

(Lock structure)
As shown in FIG. 2, a lock structure 35 is formed on the top wall 13 and the lid wall 14. The lock structure 35 includes four insertion pieces 36, four insertion holes 37, four fixing pieces 38, and four fixing holes 39. The four insertion pieces 36 are continuously provided on both sides of the pair of lid walls 14 in the step direction via the insertion ruled lines 26 (general-purpose ruled lines). The four insertion holes 37 and the four fixing pieces 38 are formed near the base end (near the root) of the pair of top walls 13. The four fixing holes 39 are formed in the four insertion pieces 36. The lock structure 35 has a function of fixing the lid wall 14 in a state of being overlapped with the top wall 13. Since the four insertion pieces 36 and the like have symmetrical shapes in the front-rear and left-right directions, one insertion piece 36 and the like will be described below.

As shown in FIG. 3, the insertion piece 36 extends from the tip end side of the step direction end portion of the lid wall 14 toward the step direction outer side. The insertion piece 36 is formed in a substantially rectangular shape with a rounded tip corner. A fixing hole 39 is formed at the base end portion (root portion) of the insertion piece 36 along the insertion ruled line 26. The fixing hole 39 is a narrow gap (slit) extending in the flow direction at the intermediate portion of the insertion ruled line 26. In the central portion of the fixing hole 39, a substantially semicircular finger hook portion 39A is formed so as to be recessed toward the lid wall 14.

The insertion hole 37 is a narrow gap (slit) extending in the flow direction along the third folding curve 23. The insertion hole 37 is formed at a position corresponding to the insertion piece 36 in a state where the lid wall 14 is overlapped with the top wall 13.

The fixed piece 38 is continuously provided at the central portion of the side wall 11 in the step direction via the first fixed ruled line 27A. The fixing piece 38 is formed from the side wall 11 to the top wall 13 so as to cross the insertion hole 37. The fixing piece 38 is formed in a substantially rectangular shape with a rounded tip corner. A second fixed ruled line 27B is formed on the fixed piece 38 at a position on the same line as the third folding curve 23. The first and second fixed ruled lines 27A and 27B are general-purpose ruled lines.

<Square pad>
As shown in FIG. 2, the four corner pads 15 extend outward in the flow direction from the positions where they enter both side portions of the top wall 13. The four corner pads 15 are arranged in four regions surrounded by a pair of top walls 13 and a pair of lid walls 14. The four corner pads 15 have a function of protecting the four corners C of the content M. Since the four corner contact portions 15 have symmetrical shapes in the front-rear direction and the left-right direction, one corner contact portion 15 will be described below.

As shown in FIG. 3, the corner contact portion 15 includes a top surface protection portion 40, a first side surface protection portion 41, a bottom surface protection portion 42, a second side surface protection portion 43, and the like, in order from the side of the top wall 13. Includes.

The top surface protection portion 40 includes a cut line 45 cut inward from the side end of the top wall 13 in the flow direction at a position separated from the third folding curve 23 toward the tip side of the top wall 13, and a third. It is formed between the end of the folding curve 23 and the folding line 50 extending diagonally toward the tip (butting) of the cutting line 45. That is, the top surface protection portion 40 is formed in a substantially right-angled isosceles triangle shape with the folding line 50 as the hypotenuse by cutting the side portion of the top wall 13. The folding line 50 is formed at an angle of approximately 45 degrees with respect to the third folding curve 23.

The first side surface protection portion 41 is continuously provided at the end portion (the bottom portion of the triangle) of the top surface protection portion 40 in the flow direction via the first folding line 51. The first side surface protection portion 41 is formed in a substantially rectangular shape that is long in the step direction with the first folding line 51 as the long side. The dimension (extension dimension) of the first side surface protection portion 41 in the flow direction is set to be slightly shorter than the extension dimension of the side wall 11. The first folding line 51 is formed at a position slightly shifted inward of the top wall 13 from the side side of the top wall 13 (extension line of the second folding curve 22).

The bottom surface protection portion 42 is continuously provided at the end of the first side surface protection portion 41 in the flow direction via the second folding line 52. The bottom surface protection portion 42 is formed in a substantially square shape with the second folding line 52 as one side. The second folding line 52 is formed at a position slightly shifted inward of the top wall 13 from the extension line of the fourth folding curve 24.

The second side surface protection portion 43 is continuously provided on the side of the lid wall 14 of the bottom surface protection portion 42 via the third folding line 53. The second side surface protection portion 43 is formed in a substantially rectangular shape long in the flow direction with the third folding line 53 as the long side. The dimension (extension dimension) of the second side surface protection portion 43 in the step direction is set to be slightly shorter than the extension dimension of the end wall 12 (or the side wall 11). The third folding line 53 is formed at a position slightly deviated from the extension line of the third folding curve 23 in the direction away from the lid wall 14. The tip of the second side surface protection portion 43 does not touch the lid wall 14.

A substantially square opening (hole) is formed in the range surrounded by the side wall 11, the end wall 12, the first side surface protection portion 41, and the second side surface protection portion 43. Further, the folding line 50 and the first to third folding lines 51 to 53 are lead ruled lines in which a plurality of cuts are formed at substantially equal intervals on the general-purpose ruled line, respectively.

[Assembly of packaging box]
Next, a step (assembly work) of assembling the packaging box 1 and packaging (accommodating) the contents M will be described with reference to FIGS. 1, 4 to 7. FIG. 4 is a perspective view showing a state in which the corner pad portion 15 is folded back. FIG. 5 is an enlarged plan view showing one corner pad portion 15 and the like. FIG. 6 is a perspective view showing a state in which the content M is covered with the top wall 13. FIG. 7 is a perspective view showing a process of fixing the lid wall 14 to the top wall 13. Here, as an example, a case where the worker wraps the contents M (seals the packaging box 1) will be described.

The packaging box 1 is assembled by appropriately bending a blank 5 with the back liner 9C facing upward. First, as shown in FIG. 4, the operator folds the four corner contact portions 15 (top surface protection portion 40) inward along the fold line 50 at approximately 180 degrees. The four corner pads 15 are superposed on the inner surfaces of the walls 10 to 13 near the four corners of the bottom wall 10. The top wall 13A and 13B are opened with a substantially right-angled isosceles triangle-shaped top hole H by folding back the top protection portion 40.

As shown in FIG. 5, in a state where the top surface protection portion 40 is folded back along the folding line 50 and overlapped with the inner surface of the top wall 13, the first side surface protection portion 41 folds the first folding line 51 for the third time. It is overlapped with the inner surface of the side wall 11 at a position corresponding to the curve 23. Further, in this state, the bottom surface protection portion 42 is overlapped with the inner surface of the bottom wall 10 at a position where the second folding line 52 corresponds to the first folding curve 21, and the second side surface protection portion 43 connects the third folding line 53. It is overlapped with the inner surface of the end wall 12 at a position corresponding to the second folding curve 22. The "position in which each folding line 51 to 53 corresponds to each folding curve 21 to 23" means, for example, that each folding line 51 to 53 is required to completely match each folding curve 21 to 23. Rather, it refers to a position where each folding line 51 to 53 and each folding curve 21 to 23 are substantially parallel while allowing an error of about several mm.

Next, as shown in FIGS. 4 and 5, the operator arranges the content M on the bottom wall 10 so as to hold the corner pad portion 15 folded back by the folded line 50 (2 of FIGS. 4 and 5). See dotted line). To be precise, the operator puts the four corners C of the contents M on the four bottom protection portions 42 laminated on the bottom wall 10.

Subsequently, as shown in FIG. 6, the operator bends the pair of side walls 11 upward along the first folding curve 21, and bends the pair of top walls 13A and 13B inward along the third folding curve 23. .. At this time, the first side surface protection portion 41 is bent upward along the second folding line 52, and the top surface protection portion 40 is bent inward along the first folding line 51. When the top walls 13A and 13B are bent, the fixing piece 38 separates from the top walls 13A and 13B and projects relatively upward.

Subsequently, the operator aligns the engaging convex portion 31 of the top wall 13A with the engaging concave portion 32 of the top wall 13B, superimposes the front engaging convex portion 31 on the outer surface of the rear top wall 13B, and rearward. The left and right sides of the top wall 13B are overlapped with the outer surface of the front top wall 13A. Then, the tips of the pair of top walls 13A and 13B are in mesh with each other.

In this state, the pair of side walls 11 stand upright at a substantially right angle to the bottom wall 10 and face both side surfaces of the contents M arranged on the bottom wall 10 in the front-rear direction. Further, the pair of top walls 13A and 13B are in a posture substantially parallel to the bottom wall 10 and face the top surface of the contents M arranged on the bottom wall 10. Further, the pair of top walls 13A and 13B are engaged with each other via the engaging portion 30 and are maintained in a state of facing the top surface of the content M. Further, in this state, the bottom surface protection portion 42 is sandwiched between the bottom wall 10 and the bottom surface of the corner portion C of the content M. The first side surface protection portion 41 is sandwiched between the side wall 11 and the front-rear side surface of the corner portion C of the content M. The top surface protection portion 40 is sandwiched between the top surface of the top wall 13 and the top surface of the corner portion C of the content M.

Next, as shown in FIG. 7, the operator bends the pair of end walls 12 upward along the second folding curve 22. At this time, the second side surface protection portion 43 is bent upward along the third folding line 53 (see FIG. 6). Subsequently, the operator bends the insertion piece 36 inward along the insertion ruled line 26, and bends the pair of lid walls 14 inward along the fourth folding curve 24. Then, the operator puts the lid wall 14 on the outer surface of the top wall 13 while inserting the insertion piece 36 into the insertion hole 37 of the top wall 13. Next, the operator bends the fixed piece 38 inward in the front-rear direction along the second fixed ruled line 27B while bending the fixed piece 38 outward in the front-rear direction at the first fixed ruled line 27A, and inserts the fixed piece 38 into the fixing hole 39 of the insertion piece 36. Then, the insertion piece 36 is maintained in the state of being inserted into the insertion hole 37.

In this state, as shown in FIG. 1, the pair of end walls 12 are in an upright posture substantially at right angles to the bottom wall 10, and are placed on both side surfaces of the contents M arranged on the bottom wall 10 in the left-right direction. opposite. Further, the pair of lid walls 14 are superposed on the top wall 13 facing the top surface of the content M, and are fixed to the top wall 13 via the lock structure 35. Further, in this state, the second side surface protection portion 43 is sandwiched between the end wall 12 and the left-right side surface of the corner portion C of the content M. The pair of lid walls 14 close the four top holes H opened in the top wall 13.

As a result, the packaging box 1 is sealed and the contents M are in a packaged state (see FIG. 1). That is, the assembly work of the packaging box 1 is completed. With the contents M packaged in this way, the four corner pads 15 are bent so as to overlap the inner surfaces of the bottom wall 10, the side wall 11, the end wall 12, and the top wall 13, and the bottom wall 10 and the side wall are covered. 11. Arranged between each of the end wall 12 and the top wall 13 and the corner portion C of the content M to protect the corner portion C of the content M (see FIG. 1).

[Opening the packaging box]
Next, a case where the packaging box 1 is opened will be described. The packaging box 1 is opened by the reverse procedure of the above assembly work. Specifically, the operator hooks a finger on the fixed piece 38 exposed on the finger hook portion 39A of the lid wall 14, and pulls out the fixed piece 38 from the fixing hole 39 (see FIG. 7). Subsequently, the operator opens the pair of lid walls 14 outward while pulling out the insertion piece 36 from the insertion hole 37 (see FIGS. 6 and 7). Next, the operator hooks his / her finger on the finger hook portion 31B (see FIG. 6) of the engaging convex portion 31 and puts the engaging convex portion 31 inward along the first and second auxiliary ruled lines 25A and 25B (see FIG. 2). Pull up while folding. Then, the rear top wall 13B that overlaps the outer surface of the front top wall 13A is also lifted together, and the meshing of the pair of top walls 13A and 13B is released. Then, the pair of top walls 13A and 13B are opened to the outside (see FIG. 4), and the operator can take out the contents M.

With the above, the opening of the packaging box 1 is completed. By returning the four corner pads 15 to the state before folding back, the packaging box 1 returns to one blank 5.

In the packaging box 1 according to the first embodiment described above, the square contact portion 15 is continuously provided on the side portion of the top wall 13 in the left-right direction (second direction). According to this configuration, the contents M can be packaged by placing the contents M on the corner pad portion 15 and the bottom wall 10 stacked on the inner surface of the bottom wall 10 or the like and appropriately bending each of the walls 11 to 13. .. In this state, since the corner portion C of the content M is doubly covered by the corner pad portion 15 and the walls 10 to 13, the corner portion C of the content M can be appropriately protected. In this way, a structure that protects the corner portion C of the content M can be easily formed by a simple procedure of folding the corner contact portion 15 so as to overlap the inner surface of the bottom wall 10 or the like.

Further, in the packaging box 1 according to the first embodiment, the square pad portion 15 is integrally formed as one blank 5. According to this configuration, it is possible to simplify the management related to the manufacture and storage of the blank 5 (packaging box 1) as compared with the case where the packaging box 1 and the square pad portion 15 are made of separate members. Further, even after the packaging box 1 is opened, the square pad portion 15 is integrally formed as one blank 5, so that, for example, the unnecessary blanks 5 can be expanded and stored in a plurality of layers. As a result, it is possible to reduce the time and effort required for collecting the blank 5 (waste) that is no longer needed.

Further, in the packaging box 1 according to the first embodiment, when the corner pad portion 15 is folded back along the folding line 50, the top surface protection portion 40, the first side surface protection portion 41, the bottom surface protection portion 42, and the second side surface protection portion 43 However, the structure overlaps the top wall 13, the side wall 11, the bottom wall 10, and the end wall 12. According to this configuration, the contents M are placed on the bottom surface protection portion 42, and the walls 11 to 13 are appropriately bent, so that the protection portions 40 to 43 and the walls 10 are provided with respect to the four surfaces of the corner portions C of the contents M. The double walls on which ~ 13 overlap can be opposed to each other. Thereby, the four corner portions C of the content M can be appropriately protected by the four corner pads 15.

Further, according to the packaging box 1 according to the first embodiment, the pair of top walls 13 are maintained in a state of covering the top surface of the content M via the engaging portion 30, so that the corner pad portion 15 is formed. The state of facing the corner portion C of the content M can be maintained.

Normally, in the yakko-shaped blank 5, when one corrugated cardboard sheet is punched out, the area surrounded by the top wall 13 and the lid wall 14 becomes an unnecessary portion and is often removed. In this regard, in the packaging box 1 according to the first embodiment, the square contact portion 15 is connected to the side portion of the top wall 13 in the left-right direction (second direction), and is surrounded by the top wall 13 and the lid wall 14. It was placed in the area. According to this configuration, since the square pad portion 15 can be arranged in a region that is generally regarded as an unnecessary portion, the area removed from the corrugated cardboard sheet can be reduced. As a result, the corrugated cardboard sheet can be used without waste, and the amount of discarded corrugated cardboard sheet can be reduced.

Further, according to the packaging box 1 according to the first embodiment, since the lid wall 14 overlaps the top wall 13, the top hole H opened by folding back the top protection portion 40 can be covered by the lid wall 14. can. As a result, the top surface of the content M can be prevented from being exposed from the hole, the top surface of the content M can be protected, and the appearance of the packaging box 1 can be kept good.

Further, in the packaging box 1 according to the first embodiment, the lid wall 14 is fixed to the top wall 13 via the lock structure 35. According to this configuration, since the top wall 13 and the lid wall 14 are maintained in a state of covering the top surface of the content M, the corner contact portion 15 is maintained in a state of facing the corner portion C of the content M. Can be done.

In the packaging box 1 according to the first embodiment, the corner pad portion 15 is connected to the top wall 13 via the inclined turn-back line 50, but the present invention is not limited to this, according to the first embodiment. As the packaging box 1 according to the modified example, for example, as shown in FIG. 8, the corner pad portion 16 may be continuously provided via a folding line 54 extending substantially parallel to the third folding curve 23 or the like. In this case, it is preferable that the corner pad portion 16 is provided on the side portion of the top wall 13 in a range surrounded by the cutting line 46 extending in the step direction and the folding line 54 extending in the flow direction.

[Second Embodiment]
Next, the packaging box 2 according to the second embodiment will be described with reference to FIGS. 9 and 10.
FIG. 9 is a plan view showing the blank 6 of the packaging box 2. FIG. 10 is an enlarged plan view showing a part of the blank 6. In the following description, the same or corresponding configurations as those of the packaging box 1 according to the first embodiment are designated by the same reference numerals, and the same or corresponding description as that of the packaging box 1 will be omitted.

In the packaging box 2 (blank 6) according to the second embodiment, the square pad portion 17 has a shape different from that of the square pad portion 15 of the packaging box 1 according to the first embodiment. The packaging box 2 has substantially the same shape as the packaging box 1 according to the first embodiment in the assembled state.

<Square pad>
As shown in FIG. 9, the four corner pads 17 extend from both ends in the flow direction of the top wall 13 toward the outside in the flow direction, and are surrounded by the pair of top walls 13 and the pair of lid walls 14. It is arranged in four areas. Since the four corner contact portions 17 have symmetrical shapes in the front-rear direction and the left-right direction, one corner contact portion 17 will be described below.

As shown in FIG. 10, the square contact portion 17 includes a second side surface protection portion 60, a top surface protection portion 61, a first side surface protection portion 62, and a bottom surface protection portion 63 in this order from the side of the top wall 13. Includes.

The second side surface protection portion 60 is continuously provided at the end of the top wall 13 in the flow direction via the first folding line 71. The second side surface protection portion 60 is formed in a substantially square shape with the first folding line 71 as one side. The first folding line 71 is formed at a position slightly shifted inward of the top wall 13 from the side side of the top wall 13 (extension line of the second folding curve 22). Further, the second side surface protection portion 60 has a folding line 70 formed substantially parallel to the first folding line 71 in the intermediate portion (substantially center) of the flow direction.

The top surface protection portion 61 is continuously provided at the end of the second side surface protection portion 60 in the flow direction via the second folding line 72. The top surface protection portion 61 is formed in a substantially square shape with the second folding line 72 as one side. The top surface protection portion 61 is formed so as to protrude outward in the flow direction from the first side surface protection portion 62 and the bottom surface protection portion 63.

The first side surface protection portion 62 is continuously provided on the side of the end wall 12 of the top surface protection portion 61 via the third folding line 73. The first side surface protection portion 62 is continuously provided at a position closer to the second folding line 72 of the top surface protection portion 61 so as not to interfere with the insertion piece 36. The first side surface protection portion 62 is formed in a substantially rectangular shape narrower in the flow direction than the top surface protection portion 61. The dimension (extended dimension) of the first side surface protection portion 62 in the step direction is set to be substantially the same as the extended dimension of the side wall 11. The third folding line 73 is formed at a position slightly deviated from the extension line of the third folding curve 23 toward the bottom wall 1.

The bottom surface protection portion 63 is continuously provided on the side of the end wall 12 of the first side surface protection portion 62 via the fourth folding line 74. The bottom surface protection portion 63 is formed in a substantially rectangular shape slightly longer in the flow direction with the fourth folding line 74 as the long side. The bottom surface protection portion 63 is formed in a substantially rectangular shape by cutting the side end portion of the lid wall 14 in the step direction in a substantially U shape. The dimension (extended dimension) of the bottom surface protection portion 63 in the step direction is set to be substantially the same as the extending dimension of the end wall 12 (or the side wall 11). The fourth folding line 74 is formed on substantially the same line as the side side of the lid wall 14 (extension line of the first folding curve 21).

A substantially square opening (hole) is formed in the range surrounded by the side wall 11, the end wall 12, the base end portion of the lid wall 14, the first side surface protection portion 62, and the second side surface protection portion 60. .. Further, the folding line 70 and the first to fourth folding lines 71 to 74 are lead ruled lines, respectively.

[Assembly of packaging box]
Next, a step (assembly work) of assembling the packaging box 2 and packaging (accommodating) the contents M will be described with reference to FIGS. 11 to 13. FIG. 11 is a perspective view showing a state in which the corner pad portion 17 is folded back. FIG. 12 is an enlarged plan view showing one corner pad portion 17 and the like. FIG. 13 is a plan view showing a part of the state in which the content M is covered with the top wall 13. Here, as an example, a case where the worker wraps the contents M (seals the packaging box 1) will be described.

First, as shown in FIG. 11, the operator folds the second side surface protection portion 60 of the four corner pad portions 17 inward along the fold line 70 at approximately 180 degrees. The four corner pads 17 are overlapped with the inner surfaces of the walls 10 to 13 near the four corners of the bottom wall 10.

As shown in FIG. 12, in a state where the second side surface protection portion 60 is folded back along the folding line 70 and double-stacked, the top surface protection portion 61 turns the second folding line 72 into the first folding line 71. It is stacked on the inner surface of the top wall 13 at the corresponding positions. Further, the first side surface protection portion 62 is overlapped with the inner surface of the side wall 11 at a position where the third folding line 73 corresponds to the third folding curve 23, and the bottom surface protecting portion 63 has the fourth folding line 74 on the first folding curve 21. It is superposed on the inner surface of the bottom wall 10 at a position corresponding to.

Next, as shown in FIGS. 11 and 12, the operator puts the four corners C of the content M on the four bottom surface protection portions 63, and then the side wall 11 and the top wall 13 so as to wrap the content M. Bend. At this time, the first side surface protection portion 62 is bent upward along the fourth folding line 74, and the top surface protecting portion 61 is bent inward along the third folding line 73. Subsequently, the operator engages the pair of top walls 13A and 13B via the engaging portion 30 (see FIG. 6).

In this state, as shown in FIG. 13, the pair of side walls 11 face each other on both side surfaces of the content M in the front-rear direction, and the pair of top walls 13A and 13B engage with each other and face the top surface of the content M. do. Further, in this state, the bottom surface protection portion 63 is sandwiched between the bottom wall 10 and the bottom surface of the corner portion C of the content M. The first side surface protection portion 62 is sandwiched between the side wall 11 and the front-rear side surface of the corner portion C of the content M. The top surface protection portion 61 is sandwiched between the top surface of the top wall 13 and the top surface of the corner portion C of the content M. The double second side surface protection portion 60 projects outward in the left-right direction (see FIG. 13).

Next, the operator bends the double-folded second side surface protection portion 60 downward along the first folding line 71 and the second folding line 72. Subsequently, the operator bends the end wall 12 and the lid wall 14 so as to wrap the top wall 13 and the double second side surface protection portion 60, and fixes the lid wall 14 to the top wall 13 via the lock structure 35. ..

In this state, the pair of end walls 12 face both side surfaces of the content M in the left-right direction. Further, the double second side surface protection portion 60 is sandwiched between the end wall 12 and the left-right side surface of the corner portion C of the content M.

As described above, the assembly work of the packaging box 2 is completed.

According to the packaging box 2 according to the second embodiment described above, it is easy to construct a structure for protecting the corner portion C of the content M by a simple procedure of folding the corner pad portion 17 so as to overlap the inner surface of the bottom wall 10 or the like. It is possible to obtain the same action and effect as that of the packaging box 1 according to the first embodiment described above.

Further, in the packaging box 2 according to the second embodiment, the second side surface protection portion 60 is doubled in a state where the top surface protection portion 61 is arranged between the top surface 13 and the top surface of the content M. Is bent along the first folding line 71 and the second folding line 72 and arranged between the lateral side surface of the corner portion C of the content M and the end wall 12. According to this configuration, the triple wall in which the end wall 12 and the double second side surface protection portion 60 overlap can be opposed to the side surface in the longitudinal direction (left-right direction) of the corner portion C of the content M. .. Thereby, the corner portion C of the content M can be appropriately protected. Further, since the contents M housed in the packaging box 2 are often transported or stored with the longitudinal direction (left-right direction) facing up and down, the contents M are on the side surface in the left-right direction which is the short side side of the contents M. Often receives a large load. In the packaging box 2, the triple wall can be opposed to the left-right side surface of the corner portion C of the content M to which a load is easily applied. Thereby, the corner portion C of the content M can be protected from a large load.

The packaging boxes 1 and 2 according to the first and second embodiments (including modified examples; the same shall apply hereinafter) are provided with four corner pads 15 to 17, but the present invention is not limited thereto. .. One or more corner pad portions 15 to 17 may be provided according to the shape of the content M (for example, when the corner portion C is formed on only one side).

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the pair of top walls 13A and 13B are connected to the pair of side walls 11, but the present invention is not limited to this. For example, one top wall 13 may be connected to at least one tip of the pair of side walls 11. Further, similarly to this, one lid wall 14 may be continuously provided at at least one end portion of the pair of end walls 12.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the extension dimension of the front top wall 13A is set to be smaller (shorter) than the extension dimension of the rear top wall 13B. The invention is not limited to this. For example, the extension dimension of the top wall 13A may be set longer than the extension dimension of the top wall 13B, or may be set to be the same as the extension dimension of the top wall 13B. Similarly, the pair of lid walls 14 may be set to different extension dimensions.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the top wall 13 is connected to the side wall 11 and the lid wall 14 is connected to the end wall 12, but the present invention is limited to this. Not done. For example, the top wall 13 may be connected to the end wall 12 (first side wall), and the lid wall 14 may be connected to the side wall 11 (second side wall).

Further, the packaging boxes 1 and 2 according to the first and second embodiments are provided with an engaging portion 30 for engaging the pair of top walls 13 and a lock structure 35 for fixing the lid wall 14 to the top wall 13. However, the engaging portion 30 and the lock structure 35 may be omitted.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the lid wall 14 is connected to the end wall 12, but the lid wall 14 may be omitted. In this case, since the lock structure 35 is omitted, it is preferable to wind a binding band or the like so that the end wall 12 and the top wall 13 do not open.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the corner pads 15 to 17 folded back at the folding lines 50, 54, and 70 are not fixed to the bottom wall 10, the top wall 13, and the like. However, the present invention is not limited to this. For example, the corner pads 15 to 17 folded back along the folding lines 50, 54, and 70 may be adhered (fixed) to the bottom wall 10, the top wall 13, or the like via an adhesive or the like.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the first to fourth folding curves 21 to 24 and the like are general-purpose ruled lines, but the present invention is not limited thereto. For example, in the first to fourth folding curves 21 to 24, etc., the back liner 9C is inside, such as a lead ruled line, a sewing machine line in which a plurality of cuts are arranged at substantially equal intervals, or a half-cut line cut to about half the thickness of a corrugated cardboard sheet. Any line may be used to bend the corrugated cardboard sheet so as to face (not shown). Further, the folding lines 50 and 70 and the respective folding lines 51 to 53, 71 to 74 were lead ruled lines. Any line for bending the corrugated cardboard sheet so that the front liner 9B faces inward, such as a reverse ruled line formed by crushing the corrugated cardboard, may be used (not shown).

Further, the sizes (dimensions) and the like of the packaging boxes 1 and 2 according to the present embodiment are examples, and can be appropriately changed according to the size of the content M.

Further, the packaging boxes 1 and 2 according to the present embodiment are formed of a double-sided corrugated cardboard sheet made of paper, but the present invention is not limited thereto. For example, the corrugated cardboard sheet may be a single-sided corrugated cardboard sheet in which a liner is attached to one side of the inner shin 9A, or a double-sided corrugated cardboard sheet in which a single-sided corrugated cardboard sheet is attached to a double-sided corrugated cardboard sheet. Further, for example, the packaging boxes 1 and 2 may be formed of thick paper, a resin plate, or the like instead of the corrugated cardboard sheet made of paper.

The description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1, 2, packaging box 10 bottom wall 11 side wall (first wall)
12 End wall (second wall)
13A, 13B (13) Top wall 14 Cover wall 15, 16, 17 Square pad 21 1st fold curve 22 2nd fold curve 23 3rd fold curve 30 Engagement part 35 Lock structure 45 Cut line 40, 61 Top surface Protective unit 41,62 1st side surface protection unit 42,63 Bottom surface protection unit 43,60 2nd side surface protection unit 50, 54, 70 Fold line 51, 71 1st fold line 52, 72 2nd fold line 53, 73 3rd Folding line 74 4th folding line C corner M Contents

Claims (7)

The bottom wall (10) on which the contents (M) formed in a plate or hexahedron shape are arranged, and
A pair of first walls (11), which are connected to both ends of the bottom wall in the first direction and are arranged on the bottom wall and face both side surfaces in the first direction of the contents.
With a pair of second walls (12) that are connected to both ends of the bottom wall in the second direction intersecting in the first direction and are arranged on the bottom wall and face both side surfaces in the second direction of the contents. ,
A top wall (13) that is connected to at least one tip of the pair of first walls and is arranged on the bottom wall and faces the top surface of the contents.
It is connected to the side portion of the top wall in the second direction, is bent so as to overlap the bottom wall, the first wall, the second wall, and the inner surface of the top wall, and the bottom wall and the first wall. , A corner pad (15, 16, 17) arranged between each of the second wall and the top wall and the corner portion (C) of the content to protect the corner portion of the content. A packaging box characterized by being equipped. The pair of first walls are connected to both ends of the bottom wall in the first direction via a first folding curve (21).
The pair of second walls are connected to both ends of the bottom wall in the second direction via a second folding curve (22).
The top wall is continuously provided at the tip of the first wall via a third folding curve (23).
The corner pad portion (15) is
A cut line (45) cut inward from the side end of the top wall in the second direction at a position separated from the third fold curve toward the tip end side of the top wall, and the third fold curve. A top surface protection portion (40) formed between an end portion and a turn-back line (50) extending diagonally toward the tip of the cut line, and a top surface protection portion (40).
A first side surface protection portion (41) which is continuously provided at an end portion of the top surface protection portion in the second direction via a first folding line (51).
A bottom protection portion (42) connected to the end of the first side surface protection portion in the second direction via a second folding line (52).
A second side surface protection portion (43), which is continuously provided on the side of the second wall of the bottom surface protection portion via a third folding line (53), is included.
In a state where the top surface protection portion is folded back along the folding line and overlapped with the inner surface of the top wall, the first side surface protection portion is a position where the first folding line corresponds to the third folding curve. The bottom surface protection portion is overlapped with the inner surface of the bottom wall at a position corresponding to the first folding curve, and the second side surface protection portion is overlapped with the inner surface of the bottom wall. The packaging box according to claim 1, wherein the third folding line is overlapped with the inner surface of the second wall at a position corresponding to the second folding curve. The pair of first walls are connected to both ends of the bottom wall in the first direction via a first folding curve (21).
The pair of second walls are connected to both ends of the bottom wall in the second direction via a second folding curve (22).
The top wall is continuously provided at the tip of the first wall via a third folding curve (23).
The corner pad (17) is
A second side surface protection having a folding line (70) connected to the end of the top wall in the second direction via a first folding line (71) and formed in parallel with the first folding line at an intermediate portion. Part (60) and
A top surface protection portion (61) connected to the end of the second side surface protection portion in the second direction via a second folding line (72).
The first side surface protection portion (62), which is continuously provided on the side of the second wall of the top surface protection portion via the third folding line (73),
The bottom surface protection portion (63), which is continuously provided on the side of the second wall of the first side surface protection portion via the fourth folding line (74), is included.
In a state where the second side surface protection portion is folded back along the folding line and doubled, the top surface protection portion is at a position where the second folding line corresponds to the first folding line. The first side surface protection portion is overlapped with the inner surface of the first wall at a position corresponding to the third folding curve, and the bottom surface protection portion is overlapped with the fourth folding curve. The line is overlapped on the inner surface of the bottom wall at a position corresponding to the first folding curve.
In a state where the top surface protection portion is arranged between the top surface and the top surface of the contents, the doubled second side surface protection portion is the first folding line and the second folding line. The packaging box according to claim 1, wherein the packaging box is bent along a line and arranged between a side surface of a corner portion of the content in a second direction and the second wall. A pair of top walls are continuously provided at the tips of the pair of first walls.
Any of claims 1 to 3, wherein four corner pads for protecting the four corners of the contents are connected to both sides of the pair of top walls in the second direction. The packaging box described in Crab. The claim is characterized in that the pair of top walls is formed with an engaging portion (30) that engages the pair of top walls with each other and maintains the pair of top walls in a state of facing the top surface of the contents. The packaging box according to 4. 1. The first aspect of the present invention is characterized in that a lid wall (14) which is connected to at least one tip of the pair of second walls and is overlapped with the top wall facing the top surface of the contents is further provided. Or the packaging box according to any one of 5. The packaging box according to claim 6, wherein a lock structure (35) for fixing the lid wall in a state of being overlapped with the top wall is formed on the top wall and the lid wall.

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