JP2019112114A - Packaging box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve box-making property and compression resistance without deteriorating opening workability. A packaging box 10 is formed along an outer peripheral wall 12 having a pair of side plates 13, a bottom plate 14, and a top plate 15, a lid wall 20 having an inner flap 21 and outer flaps 23, 25, and an adhesive portion 28A. A first breaking line 30 provided on the inner flap 21 and a second breaking line 35 provided on the side plate 13 along the first ridge portion 17 are provided. The second ridge portion 22 provided between the side plate 13 and the inner flap 21 is composed of a ruled line that does not include a cut portion. The first break line 30 includes a first break portion 31 extending from the tip end side of the inner flap 21 to the second ridge portion 22 side, and a second ridge portion 22 from the end 31b of the first break portion 31 toward the top plate 15. It has a second breaking portion 32 extending in a direction intersecting with. The end 32a of the second breaking portion 32 is located closer to the top plate 15 than the end 35a of the second breaking line 35. [Selection diagram] Fig. 1

Description

  The present invention relates to a packaging box.

  As a packaging box, there is known a wrap around case in which both open ends of a rectangular cylindrical outer peripheral wall are closed by a lid wall having a pair of inner flaps and a pair of outer flaps. The packaging box disclosed in Patent Document 1 breaks the side plate of the outer peripheral wall along the first breaking line, and breaks the upper portion of the ridge portion between the side plate and the inner flap along the second breaking line. By peeling the outer flap against the inner flap, the upper part can be separated and opened in a tray shape.

JP 2012-91799 A

  In the packaging box of Patent Document 1, since the breaking lines are provided at the flanges of the side plate and the inner flap, the opening workability for separating the upper part is good. However, since the compression resistance of the buttocks provided with the breaking line is lowered, if a plurality of packaging boxes are stacked at the time of storage, there is a disadvantage that the lower packaging box is crushed and the appearance is deteriorated. In addition, even in the state of the blank before boxing, the stiffness (waist) of the part provided with the breaking line is reduced, so the inner flap is bent at an unintended timing with respect to the side plate, and automatic boxing of the packaging box by the boxing device Can cause problems.

  An object of the present invention is to provide a packaging box capable of improving the box forming property and the compression resistance without reducing the opening workability.

  According to one aspect of the present invention, there is provided a quadrangular tubular outer peripheral wall continuously provided via a first flange portion in the order of a bottom plate, a side plate, a top plate, and another side plate opposed to the side plate; A series is connected to the bottom plate and the top plate through an inner flap connected to a pair of the side plates via a second ridge crossing the ridge and a third ridge crossing the second ridge. And an outer flap adhered to the outer surface of the inner flap by an adhesive, and provided on the inner flap along the adhesive and a pair of lid walls closing the opening at both ends of the outer peripheral wall A second breaking line provided on the side plate along the first ridge portion from one side to the other side of the second flanges located at both ends of the side plate; The second ridge portion is constituted by a ruled line not including a cutting portion, and the first break line is A first breaking portion provided on the tip side of the outer flap than the bonding portion and extending from the tip side of the inner flap to the second buttocks side, and the first breaking portion located on the second buttocks side A second breaking portion extending from the end of the second plate toward the top plate in a direction crossing the second ridge, the end of the second breaking portion located on the second ridge side being the (2) A packaging box is provided which is located closer to the top plate than the end of the breaking line.

  In this packaging box, since the second ridge between the side plate and the inner flap is formed of a crease which does not include the cut portion, it is possible to prevent the reduction of the rigidity of the second ridge of the blank. Therefore, when making a packaging box into a box, since the unintended bending of the inner flap with respect to a side plate can be prevented, it does not interfere with automatic boxing of the packaging box by a box making apparatus. Since the second ridge portion does not include the cut portion, the reduction in the compression resistance in the packaged state can be prevented. Therefore, even if a plurality of packaging boxes are stacked, the lower packaging box does not collapse and the appearance does not deteriorate.

  When the packaging box is opened, for example, the outer flap continuous with the top plate is pulled up to the top plate side. As a result, after the inner flap is broken along the first breaking portion that constitutes the first breaking line, the inner flap is subsequently broken along the second breaking portion toward the top plate. Under the present circumstances, since the adhesion part harder than an inner flap functions as a guide part which supports a top-plate side, an inner flap can be effectively fractured | ruptured along a 1st breaking line.

  Thereafter, the fracture proceeds from the end of the second fracture toward the second ridge and then along the second ridge with a fold toward the top plate. Thus, a part of the inner flap located on the top plate side is separated in a state of being adhered to the outer flap. Subsequently, when the side plate is fractured along the second fracture line, the fracture proceeds from the end of the second fracture line toward the second ridge and is connected to the previously fractured part. Thus, the packaging box separates the upper portion including the top plate, the top plate side from the first breaking line of the inner flap, the outer flap continuous to the top plate, and the top plate side than the second breaking line of the side plate. It will be opened.

  Thus, after breaking the inner flap along the first breaking line, by breaking the side plate along the second breaking line, the packaging box can be opened in the form of a tray in which the upper portion is separated. Further, in the opened state, the top plate side of the inner flap is separated, so the upper side of the outer flap continuous to the bottom plate is largely opened. Therefore, since the exposed area of the articles stored inside can be enlarged, the workability for taking out the articles can be improved.

  The second fracture portion is curved along the bonding portion so as to be convex toward the second ridge portion. According to this aspect, the fracture can be advanced from the end of the second fracture portion to the second ridge while reliably breaking the inner flap along the bonding portion.

  The end of the first breaking line located on the second ridge side and the end of the second breaking line are positioned at a predetermined distance from the second ridge. According to this aspect, it is possible to prevent the internal flap and the side plate from being bent by transmitting the compressive force acting on the second ridge portion to the first breaking line and the second breaking line. Therefore, the appearance of the packaging box can be reliably prevented from being deteriorated.

  The side plate is provided with an operating portion for breaking the side plate along the second breaking line. According to this aspect, the workability at the time of breaking the side plate along the second breaking line can be improved.

  The tip of the inner flap is provided with a notch so as to be located in the vicinity of the first breaking portion. According to this aspect, by concentrating the force at which the outer flap is operated at the notch, the first breaking line can be broken starting from the notch, so that the workability of breaking the inner flap can be improved.

  In the packaging box of the present invention, the second ridge between the side plate and the inner flap comprises a crease which does not include a cut. Therefore, in the state of a blank, since the unintended bending of the inner flap with respect to a side plate can be prevented, the box-formability of a packaging box can be improved. Further, in the packaged state, since the reduction in the compression resistance can be prevented, the inner flap and the side plate can be prevented from being crushed, and the appearance of the packaging box can be prevented from being deteriorated.

  Furthermore, by breaking the inner flap along the first breaking line and breaking the side plate along the second breaking line, it is possible to easily open the packaging box with the upper part separated. And in this case, since the adhesion part functions as a guide part which supports the top plate side of the first breaking line, the inner flap can be effectively broken along the first breaking line.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the packaging box which concerns on 1st Embodiment of this invention. II-II sectional view taken on the line of FIG. The perspective view which shows the opening state of a packaging box. The front view of the blank of the packaging box of FIG. The back view of the blank of FIG. 4A. The top view of the blank of FIG. 4A. FIG. 4B is a bottom view of the blank of FIG. 4A. The left side view of the blank of FIG. 4A. FIG. 4B is a right side view of the blank of FIG. 4A. The unfolded view of the blank showing all the bending lines. The expanded view which expanded a part of FIG. 5A. The perspective view which shows 1 process of opening operation. The perspective view which shows one process of opening operation. The perspective view which shows one process of opening operation. The perspective view of the packaging box which concerns on 2nd Embodiment. XX sectional drawing of FIG. The front view of the blank of the packaging box of FIG. The back view of the blank of FIG. 11A. The unfolded view of the blank showing all the bending lines. The perspective view of the packaging box which concerns on 3rd Embodiment. The front view of the blank of the packaging box of FIG. The back view of the blank of FIG. 14A. The unfolded view of the blank showing all the bending lines.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
1 to 3 show a packaging box 10 according to a first embodiment of the present invention. The packaging box 10 is a wrap around case including a rectangular cylindrical outer peripheral wall 12 and a lid wall 20 for closing the opening of the outer peripheral wall 12. As shown in FIG. 3, the packaging box 10 breaks the inner flap 21 constituting the lid wall 20 by the first broken line 30 and breaks the side plate 13 constituting the outer peripheral wall 12 by the second broken line 35. , The upper part is configured to be able to be opened in a tray shape separated. In the present embodiment, the reduction of the compression resistance of the packaging box 10 due to the provision of the first breaking line 30 and the second breaking line 35 is prevented, and the box forming property of the packaging box 10 is improved.

  In the following description, the length direction of the packaging box 10 in which the pair of lid walls 20 oppose is called X direction, the width direction of the packaging box 10 in which the pair of side plates 13 is opposite is called Y direction, and the outer peripheral wall 12 is configured. The height direction of the packaging box 10 in which the bottom plate 14 and the top plate 15 face each other is referred to as the Z direction. In the packaging box 10 of this embodiment, the dimension in the X direction is formed longer than the dimension in the Y direction, and the dimension in the Y direction is formed longer than the dimension in the Z direction, but these dimensions are accommodated inside It changes according to the goods.

(Overview of packaging box)
The packaging box 10 is formed by bending and fixing one blank shown in the six views shown in FIGS. 4A to 4F and the developed view shown in FIG. 5A at a predetermined portion. The blank is formed by punching out a cardboard sheet made of paper by a well-known carton punching device. The corrugated cardboard sheet has a configuration in which a corrugated center ring is disposed between the front liner (the outer surface of the packaging box 10) and the back liner (the inner surface of the packaging box 10). A portion shown by a thin solid line in FIG. 4B and a portion shown by an alternate long and short dash line in FIG. 5A is a general-purpose ruled line formed by scoring from the side of the back liner so as to compress the thickness. A portion shown by a thin solid line in FIG. 4A and a portion shown by a two-dot chain line in FIG. 5A is a reverse ruled line formed by scoring from the side of the front liner so as to compress the thickness. The portions shown by thick solid lines in FIG. 4A, FIG. 4B, and FIG. 5A are cutting lines formed by inserting a blade from the back liner to the front liner and shape lines (sides) formed by punching.

  As shown in FIGS. 1 and 2, the outer peripheral wall 12 includes a pair of side plates 13, a bottom plate 14, and a top plate 15. Among them, the pair of side plates 13 is formed in the same square shape, and the bottom plate 14 and the top plate 15 are formed in substantially the same square shape. These are continuous in the order of the bottom plate 14, the side plate 13, the top plate 15, and the side plate 13 via the folding line 17 that constitutes the first ridge portion, and are respectively bent in the orthogonal direction.

  Referring to FIG. 5A, the top plate 15, one side plate 13, the bottom plate 14, and the other side plate 13 are connected in this order from the upper side to the lower side via a fold line 17. A connecting plate 16 is connected to a side plate 13 located at the lower end of FIG. 5A via a bending line 17. The connection plate 16 is bonded to the inner surface (back liner) of the top plate 15 positioned at the upper end of FIG. 5A via the bonding portion 28 (see FIG. 1). That is, the side plate 13 located at the lower end of FIG. 5A and the top plate 15 located at the upper end of FIG. 5A are continuous via the connection plate 16. The folding line 17 is a general ruled line, and extends in the X direction in the assembled state of FIGS. 1 and 2.

  Continuing to refer to FIGS. 1 and 2, the pair of lid walls 20 are formed in the same square shape. Each cover wall 20 includes a pair of inner flaps 21 connected to the end of the side plate 13 in the X direction, an outer flap 23 connected to the end of the bottom plate 14 in the X direction, and the top plate 15 in the X direction. It is comprised with the outer flap 25 arranged in a row at the end.

  The inner flaps 21 are connected to the end of the side plate 13 extending in the Z direction via a fold line 22 forming a second ridge. The inner flap 21 is bent inward with respect to the side plate 13 so as to extend in the same Y direction as the bottom plate 14 and the top plate 15. The fold line 22 is configured by a general-purpose ruled line that does not include a cut portion. Here, the cutting portion means a cutting line (full cutting line) formed by inserting a blade from the back liner to the front liner, and a half cut formed by inserting the blade only in a part of the corrugated cardboard sheet (for example, back liner side) Means a line.

  The lower outer flaps 23 are connected to the end of the bottom plate 14 extending in the Y direction via a fold line 24 forming a third ridge. The upper outer flap 25 is connected to an end of the top plate 15 extending in the Y direction via a folding line 26 forming a third ridge. The pair of outer flaps 23 and 25 are bent so as to overlap the outer surface (front liner) side of the pair of inner flaps 21 and are respectively bonded via bonding portions 28A and 28B. The folding lines 24 and 26 are configured by general ruled lines.

  Referring to FIG. 5A, the fold lines 22, 24 and 26 are formed to be positioned approximately on a straight line. The tips of the inner flaps 21 and the outer flaps 23 and 25 are also formed so as to be positioned substantially straight. The projecting dimension of the outer flap 23 from the folding curve 24 to the tip of the outer flap 23 and the projecting dimension of the outer flap 25 from the folding curve 26 to the tip of the outer flap 25 are lengths in which the tips of the outer flaps 23 butt against each other. It is set to. Thus, a predetermined air gap is formed between the tips of the pair of inner flaps 21. The air gap also has a function as an operation unit for opening the outer flap 25.

  For example, an adhesive (hot melt) using a heat melting resin is used as the bonding portion 28 of the connection plate 16 and the top plate 15 and the bonding portions 28A and 28B of the pair of inner flaps 21 and outer flaps 23 and 25. There is.

(Lined line structure for opening the packaging box)
As shown in FIG. 3, the packaging box 10 of the present embodiment is configured to be able to be opened in a tray shape from which the upper part is removed. As shown in FIGS. 1 and 2, the inner flap 21 is provided with a first breaking line 30 and the side plate 13 is provided with a second breaking line 35 in order to set the open state. Further, in order to promote the breaking of the inner flap 21 along the first breaking line 30, the inner flap 21 is provided with one auxiliary folding curve 41. In order to promote the breaking of the side plate 13 along the second breaking line 35, the side plate 13 is provided with two types (four in total) of auxiliary folding curves 42 and 43. These are provided for opening the packaging box 10 and are not for disassembly.

(Details of the first breaking line)
As shown in FIGS. 1 to 3, the first break line 30 is to break the inner flap 21 bonded to the outer flap 25 by the bonding portion 28A by the operation of the outer flap 25 continuous to the top plate 15. . The first breaking line 30 is composed of a plurality of cutting lines intermittently provided to form a perforated line. As shown most clearly in FIG. 1, the first break line 30 is formed in the inner flap 21 in a position to be covered by the outer flap 25. The first breaking line 30 of the present embodiment is constituted by a first breaking portion 31 located on the tip side of the inner flap 21 and a second breaking portion 32 located on the folding curve 22 side of the inner flap 21.

  As shown to FIG. 5B, the 1st fracture | rupture part 31 is provided in the front end side of the outer flap 25 rather than the adhesion part 28A by the side of the top plate 15 so that it may be located between adhesion part 28A, 28B. The first breaking portion 31 linearly extends from the tip end side of the inner flap 21 to the folding curve 22 side along the folding line 26 (Y direction) so as to intersect with the operation direction of the outer flap 25 (upward in the Z direction). It extends. A notch 33 is provided at the tip of the inner flap 21 so as to be located in the vicinity of the end 31 a of the first breaking portion 31 located on the tip side of the inner flap 21. The notched portion 33 and the end 31a of the first broken portion 31 are positioned at a relatively short interval i1 (for example, 2 mm) at which the fracture starting from the notched portion 33 can proceed to the first broken portion 31. The end 31 b of the first breaking portion 31 located on the folding curve 22 side is set to be located approximately at the center of the bonding portion 28A in the Y direction.

  The second breaking portion 32 breaks the inner flap 21 subsequently to the first breaking portion 31. The second breaking portion 32 is provided to extend from the end 31 b of the first breaking portion 31 toward the top plate 15 in a direction intersecting the folding line 22. The second breaking portion 32 of the present embodiment is formed in an arc shape that contacts the first breaking portion 31 and curves along the bonding portion 28A so as to be convex toward the bending line 22. The arc-shaped second break portion 32 extends in the direction intersecting with the bending line 22 means that an imaginary tangent VT passing through the end 32 a of the second breaking portion 32 which is in contact with the second break portion 32 and located on the bending line 22 side , Means to intersect the fold line 22. The end 32a of the second breaking portion 32 is located at a predetermined distance i2 with respect to the bending line 22 and located on the top plate 15 side (upper side in the Z direction) than the end 35a of the second breaking line 35 Is set. The distance i2 is set to a distance that can prevent an unintended fold passing through the end 32a of the second breaking portion 32 when the inner flap 21 is bent along the bending line 22 with respect to the side plate 13 And is larger than the interval i1. For example, the distance i2 is preferably set to 5 mm or more, and is set to 7 mm in the present embodiment.

  When breaking the inner flap 21 along the first breaking line 30, the bonding portion 28A harder than the inner flap 21 functions as a guide for supporting the top plate 15 side of the first breaking line 30. Therefore, it is preferable to provide the first breaking line 30 and the bonding portion 28A as close to each other as possible. Specifically, the distance between the first breaking line 30 and the bonding portion 28A is preferably set to 0 mm or more and 40 mm or less, and more preferably set to 0.5 mm or more and 30 mm or less. This is because breakage of the inner flap 21 along the first breaking line 30 becomes impossible if the bonding portion 28A is provided to the bottom plate 14 side beyond the first breaking line 30 less than 0 mm. If the setting exceeds 40 mm, the first breakage line 30 and the bonding portion 28A are excessively separated, so that the top plate 15 side of the first breakage line 30 can not be supported by the bonding portion 28A. It is because breakage of the inner flap 21 becomes difficult. Therefore, the inner flap 21 can be effectively broken by forming the first breaking line 30 and the bonding portion 28A in the above-described appropriate range excluding them.

  The setting of the distance between the first breaking line 30 and the bonding portion 28A can be made by setting the formation position of the first breaking line 30, the application position of the adhesive constituting the bonding portion 28A, and the coating amount of the adhesive. Among them, the application amount of the adhesive is set according to the area of the inner flap 21 and the outer flaps 23 and 25 to a predetermined amount capable of securely fixing them. However, some errors occur in the formation position of the first breaking line 30, the application position of the adhesive, and the application amount of the adhesive. Therefore, it is preferable to set to 2.5 mm or more and 55 mm or less, and it is more preferable to set to 3 mm or more and 45 mm or less between the application position (center of adhesion part 28A) of the adhesive and the first break line 30. By setting in this manner, the distance between the first breaking line 30 and the bonding portion 28A can be set to the appropriate range.

(Details of the second breaking line)
As shown in FIGS. 1 and 5A, the second break line 35 is to break the side plate 13 by the operation of the operation unit 36. The second breaking line 35 is a bending line from one side to the other of the pair of bending lines 22 located at both ends in the X direction of the side plate 13 so as to intersect the operation direction (Z direction upward) of the operation portion 36 It is provided along 17 The second breaking line 35 is composed of a plurality of cutting lines intermittently provided to form a perforated line. The second breaking line 35 of the present embodiment is formed in a wave shape repeating unevenness in the Z direction, but may be formed in a straight line as a whole, or may be formed in an arc as a whole, and its shape Can be changed as needed.

  Referring to FIG. 5B, the end 35a of the second breaking line 35 located on the side of the folding line 22 is spaced apart from the folding line 22 by a predetermined distance i3 and is greater than the end 32a of the second breaking part 32. It is set to be located on the lower side in the Z direction. In the present embodiment, the entire second break line 35 is formed closer to the bottom plate 14 than the first break line 30. The space i3 can prevent an unintended crease passing through the end 35a of the second breaking line 35 when the inner flap 21 is bent along the bending line 22 with respect to the side plate 13 similarly to the space i2. The distance is set. For example, the distance i3 is preferably set to 5 mm or more and 15 mm or less, and is set to 11.5 mm in the present embodiment.

  The position of the end 32 a of the first break line 30 in the Z direction corresponds to the distance along the folding line 22 to the top plate 15 after the break of the inner flap 21 along the first break line 30. The position of the end 35a of the second breaking line 35 in the Z direction corresponds to the distance along the bending line 22 to the portion broken by the first breaking line 30 after the breaking of the side plate 13 along the second breaking line 35 Do. These distances are not preferable because if too long, breakage may proceed in an unintended direction. On the other hand, if the length is too short, it is not preferable because particularly the removed portion of the side plate 13 decreases and the exposed area of the article decreases. Therefore, in the present embodiment, the end 32a of the first breaking line 30 is set to the upper 1/3 area with respect to the total height of the packaging box 10 in the Z direction, and the end 35a of the second breaking line 35 is lower. It is set to 1/3 area of. Thereby, the exposed area of the article is secured while preventing breakage in an unintended direction.

  The operating portion 36 is provided on the side plate 13 so as to be located at the center of the second breaking line 35 in the X direction. The second break line 35 is not provided in the portion where the operation unit 36 is provided. The operating portion 36 is defined by a folding line 37, a pair of first broken lines 38 and a second broken line 39.

  The fold line 37 is a general ruled line and extends in the X direction along the fold line 17. The first broken line 38 is composed of two or more cutting lines formed at intervals, and is formed in an arc shape from both ends of the folding line 37 toward the inner flap 21. The second broken line 39 is formed of two or more cutting lines formed at intervals, and is formed in an arc shape from one to the other of the X-direction outer ends of the pair of first broken lines 38. Second breaking lines 35 are continuous with both ends of the second broken line 39.

(Details of auxiliary folding curve)
As shown in FIGS. 1, 2 and 5B, the auxiliary folding line 41 assists the breaking of the inner flap 21 along the first breaking line 30. The auxiliary folding curve 41 is formed of a general-purpose ruled line, and is formed closer to the top plate 15 than the first breaking line 30 and on the tip end side of the inner flap 21. The auxiliary folding curve 41 is inclined so that the end on the first breaking line 30 side is positioned on the tip side of the inner flap 21 than the end on the top plate 15 side. That is, the auxiliary folding line 41 is gradually inclined toward the tip of the inner flap 21 from the first breaking line 30 side toward the top plate 15 side.

  As shown in FIGS. 1 and 5A, the pair of first auxiliary folding lines 42 and the pair of second auxiliary folding lines 43 assist the breakage of the side plate 13 along the second breaking line 35. The first auxiliary folding line 42 and the second auxiliary folding line 43 are formed to be closer to the top plate 15 than the second breaking line 35.

  The first auxiliary folding line 42 is a general ruled line, and is formed at the central portion of the side plate 13 in the X direction. The first auxiliary folding line 42 extends from the operation portion 36 side to the top plate 15 side, and is inclined outward in the X direction. The end on the operation unit 36 side of the first auxiliary folding curve 42 is set to be spaced apart from the operation unit 36. The end on the top plate 15 side of the first auxiliary folding line 42 is set to be spaced apart from the folding line 17. This spacing, like the spacings i2 and i3, prevents the unintended fold passing through the end of the first auxiliary folding curve 42 when the top plate 15 is folded along the folding line 17 with respect to the side plate 13 Is set to a possible distance.

  The second auxiliary folding line 43 is formed of a reverse crease and is formed outside the first auxiliary folding line 42 in the X direction. The second auxiliary bending line 43 is inclined in the opposite direction to the first auxiliary bending line 42. That is, the second auxiliary bending line 43 extends from the second breaking line 35 side to the top plate 15 side and is inclined inward in the X direction. The end on the second breaking line 35 side of the second auxiliary folding line 43 is set to be spaced apart from the second breaking line 35 and the folding line 22. The end on the top plate 15 side of the second auxiliary bending line 43 is set to be spaced apart from the bending line 17. As with the intervals i2 and i3, when spacing the inner flap 21 relative to the side plate 13 along the fold line 22 and when folding the top plate 15 along the fold line 17 relative to the side plate 13, The distance is set such that an unintended fold can be prevented from passing through the end of the second auxiliary fold line 43.

(Box making operation of packaging box)
The packaging box 10 is boxed, for example, as follows. First, as shown in FIG. 4B, the blank is placed so that the back liner is on the upper side, and the article is placed on the bottom plate 14. Next, after bending the pair of side plates 13 with respect to the bottom plate 14, the connection plate 16 and the top plate 15 are each bent with respect to the pair of side plates 13. Then, the overlapping top plate 15 and the connection plate 16 are bonded by the bonding portion 28.

  Next, after the inner flaps 21 are bent with respect to the side plate 13, the outer flaps 23 and 25 are bent with respect to the bottom plate 14 and the top plate 15. Then, the overlapped portions of the inner flap 21 and the outer flaps 23 and 25 are bonded by the bonding portions 28A and 28B. Thereby, the lid wall 20 is formed, and the opening of the outer peripheral wall 12 is closed.

  Under the present circumstances, since the fold line 22 between the side plate 13 and the inner flap 21 consists of a general-purpose ruled line which does not contain a cut part, the fall of the rigidity of the fold line 22 part of a blank can be prevented. Therefore, when transferring a blank to a box making line, it can prevent that the inner flap 21 bends with respect to the side plate 13 at an unintended timing. Further, since the end 32a of the first breaking line 30 and the end 35a of the second breaking line 35 are located at intervals i2 and i3 with respect to the bending line 22, the side plate 13 and the side plate 13 are taken along the bending line 22. When the inner flap 21 is folded, it can be reliably folded along the folding line 22. As a result, even if the packaging box 10 is automatically boxed by the box-making apparatus, no problem occurs.

  In the boxed packaging 10 produced in the box, since the folding line (second ridge) 22 extending in the Z direction does not include the cut portion, the compression resistance does not decrease, and a predetermined pressure resistance is secured. Further, since the end 32a of the first breaking line 30 and the end 35a of the second breaking line 35 are positioned at intervals i2 and i3 with respect to the folding line 22, the folding is performed when the packaging boxes 10 are stacked. The compressive force acting on the curve 22 is transmitted to the first breaking line 30 and the second breaking line 35, and the inner flap 21 and the side plate 13 can be prevented from being bent (collapsed). Thus, the appearance of the packaging box 10 can be reliably prevented from being deteriorated.

(Opening operation of packaging box)
When the packaging box 10 is opened, first, a hand is inserted between the pair of outer flaps 23 and 25 to grip the center of the tip of the outer flap 25 continuous with the top plate 15 and pull it toward the top plate 15 side. Then, the operation force on the outer flap 25 is transmitted to the inner flap 21 through the adhesive portion 28A, and the inner flap 21 is broken along the first breaking portion 31 of the first breaking line 30, as shown in FIG. Subsequently, the inner flap 21 is broken along the second breaking portion 32 subsequently.

  Under the present circumstances, since the notch part 33 is provided in the front-end | tip of the inner flap 21, the operating force of the outer flap 25 transmitted to the inner flap 21 concentrates on the notch part 33. FIG. Therefore, since the inner flap 21 can be fractured along the first fracture line 30 starting from the notch 33, the workability can be improved. In addition, a shear force in the X direction and an upward tensile force in the Z direction act on the first breaking line 30 by the mountain flaps of the inner flap 21 along the auxiliary folding line 41. Therefore, particularly in the vicinity of the auxiliary folding line 41, the breaking of the inner flap 21 along the first breaking line 30 can be promoted.

  In addition, the bonding portion 28A supports the top plate 15 side of the first breaking line 30, and plays a role of a guide portion that promotes the breaking of the inner flap 21 along the first breaking line 30. In particular, when the fracture site moves from the first fracture part 31 to the second fracture part 32, the direction in which the fracture proceeds changes from the Y direction to the Z direction, but the second fracture part 32 is a circle that curves along the bonding part 28A. Since it is formed in an arc shape, the inner flap 21 can be reliably broken along the bonding portion 28A.

  As shown in FIG. 7, since the second breaking portion 32 extends in the direction crossing the bending line 22, the breaking reaching the end 32 a of the second breaking portion 32 continues to advance to the bending line 22, and It advances toward the top plate 15 along the folding line (second ridge) 22 with a fold. As a result, a part of the inner flap 21 located on the top plate 15 side is separated in a state of being adhered to the outer flap 25, and as shown in FIG. 8, approximately half of the lid wall 20 is unsealed.

  Under the present circumstances, the end 32a of the 2nd fracture part 32 is located in the top plate 15 side rather than the 1st fracture part 31, and the 2nd fracture part 32 is extended in the direction which intersects with the curve 22. Therefore, the position where the fracture reaches the fold line 22 approaches the top plate 15, and the fracture along the fold line 22 is as small as possible. As a result, when the folding line 22 does not include the cut portion, the breakage does not proceed in an unintended direction or the opening workability is not impaired.

  When part of the lid wall 20 at both ends is broken, the side plate 13 is subsequently broken along the second broken line 35. Specifically, first, the operation unit 36 is pushed inward in the Y direction. Thereby, the side plate 13 is broken along the first broken line 38 and the second broken line 39, and the operation portion 36 is opened. Next, a hand is inserted into the operation unit 36, and the top plate 15 side of the side plate 13 is gripped and pulled up toward the top plate 15. Thereby, the side plate 13 is broken in the Y direction along the second breaking line 35.

  Under the present circumstances, since the operation part 36 is provided in the side plate 13, the fracture | rupture workability of the side plate 13 along the 2nd tearing line 35 can be improved. Further, the side plate 13 is mountain-folded along the center first auxiliary bending line 42 and is valley-broken along the second auxiliary bending lines 43 on both sides. As a result, the shear force in the Y direction and the tensile force in the Z direction act on the second break line 35, so that the break of the side plate 13 along the second break line 35 can be promoted.

  The fracture reaching the end 35 a of the second fracture line 35 proceeds toward the folding line 22 and then along the folded folding line (second ridge) 22 toward the top plate 15 , As shown in FIG. 3 leads to the previously broken part. Thus, the top plate 15 includes the top plate 15 side of the first breaking line 30 of the inner flap 21, the outer flap 25 continuous with the top plate 15, and the top plate 15 side of the second breaking line 35 of the side plate 13. The upper part is separated in the unfolded state. As a result, the packaging box 10 in the opened state is in a tray state including the bottom plate 14, the lower portion of the inner flap 21, the outer flap 23 continuous with the bottom plate 14, and the lower portion of the side plate 13.

  Thus, in the packaging box 10 of the present embodiment, after the inner flap 21 is broken along the first breaking line 30, the side plate 13 is broken along the second breaking line 35 to separate the upper portion. It can be opened to the state. Then, in the opened state, since the upper side is opened larger than the outer flap 23 continuous to the bottom plate 14, the exposed area of the article contained inside can be enlarged, and the workability for taking out the article can be improved.

  As described above, in the packaging box 10 of the present embodiment, the folding curve 22 between the side plate 13 and the inner flap 21 is a general-purpose ruled line that does not include the cut portion, and the first break line 30 of the inner flap 21 is curved (2) Since the fractured portion 32 is provided, it is possible to reliably prevent the deterioration of the box forming property and the compression resistance without impairing the opening workability.

(Second opening condition)
The code | symbol 45 shown to FIG. 1 and FIG. 5A is a folding line used when taking out only a part of articles | goods in the packaging box 10. As shown in FIG. The folding line 45 is provided on the top plate 15 and is formed from an end center on the connection plate 16 side in the Y direction to one end of the side plate 13 on the opposite side in the X direction. The folding line 45 is constituted by a lead crease provided with a plurality of cutting lines at intervals on a general-purpose crease.

  In the second opened state, as shown in FIG. 8, half of the top plate 15 is peeled off from the connection plate 16 (adhesive portion 28) in a state where the outer flap 25 side of one lid wall 20 is opened. Thereafter, the top plate 15 is bent outward along the folding line 45. Thereby, it can be set as the 2nd opening state which opened a part of top plate 15. FIG.

Second Embodiment
9 to 12 show the packaging box 10 of the second embodiment. The second embodiment differs from the first embodiment in that the auxiliary folding line 41 (see FIG. 5A) of the inner flap 21 and the folding line 45 (see FIG. 5A) of the top plate 15 are not provided.

Third Embodiment
13 to 15 show a packaging box 10 according to a third embodiment. In the third embodiment, the auxiliary folding line 41, the first auxiliary folding line 42, the second auxiliary folding line 43, and the folding line 45 of the inner flap 21 shown in FIG. 5A are not provided. It is different.

  In the second and third embodiments, only the front view (FIGS. 11A and 14A) and the back view (FIGS. 11B and 14B) of the blanks are illustrated, but the plan view of each blank is the same as FIG. 4C. The bottom view appears the same as FIG. 4D, the left side view the same as FIG. 4E, and the right side view the same as FIG. 4F.

  In the packaging box 10 of the second embodiment and the third embodiment configured as described above, it is possible to reliably prevent the deterioration of the box forming property and the compression resistance without impairing the opening workability, as in the first embodiment. .

  In addition, the packaging box 10 of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, the first breaking line 30 and the second breaking part 32 may be constituted by a single zipper provided with a cutting line for guiding obliquely extending at one end of a cutting line formed at a predetermined interval, One of the liner and the front liner may be formed by a broken half-cut line. In addition, the operation unit 36 can be changed as needed as long as the side plate 13 is opened and the side plate 13 can be broken along the second break line 35.

  The first breaking portion 31 of the first breaking line 30 that breaks the inner flap 21 may be configured by a curve. In addition, the second breaking portion 32 of the first breaking line 30 may be formed in a polygonal shape as long as it follows the bonding portion 28A.

DESCRIPTION OF SYMBOLS 10 ... Packaging box 12 ... Outer peripheral wall 13 ... Side plate 14 ... Bottom plate 15 ... Top plate 16 ... Connection plate 17 ... Folding curve (1st heel part)
20 ... lid wall 21 ... inside flap 22 ... bending curve (the second heel part)
23: Outside flap 24: Folded curve (third buttocks)
25: Outside flap 26: Folded curve (third buttocks)
28, 28A, 28B: Bonding part 30: first broken line 31: first broken part 31a, 31b: end 32: second broken part 32a: end 33: notch 35: second broken line 35a: end 36: operation Part 37: folding line 38: first broken line 39: second broken line 41: auxiliary folding line 42: first auxiliary folding line 43: second auxiliary folding line 45: folding line

Claims (5)

A rectangular cylindrical outer peripheral wall connected in series via the first flange portion in the order of the bottom plate, the side plate, the top plate, and the other side plate facing the side plate;
The bottom plate and the top plate are provided with an inner flap continuously connected to the pair of side plates via a second ridge portion intersecting the first ridge portion, and a third ridge portion intersecting the second ridge portion. A pair of lid walls each provided in series with the outer flaps, the outer flaps being adhered to the outer surface of the inner flap by an adhesive, and closing the openings at both ends of the outer peripheral wall;
A first breaking line provided on the inner flap along the bonding portion;
A second breaking line provided on the side plate along the first ridge portion from one side to the other side of the second ridge portions positioned at both ends of the side plate;
The second ridge portion is constituted by a ruled line not including a cutting portion,
The first breaking line is
A first breaking portion provided on the tip side of the outer flap than the bonding portion, and extending from the tip side of the inner flap to the second buttock side;
A second breaking portion extending from the end of the first breaking portion located on the second ridge side toward the top plate in a direction intersecting with the second ridge;
The packaging box according to claim 1, wherein an end of the second breaking portion located on the second ridge side is located closer to the top plate than an end of the second breaking line.   The packaging box according to claim 1, wherein the second fracture portion is curved along the bonding portion so as to be convex toward the second ridge portion.   The end of the first breaking line located on the second ridge side and the end of the second breaking line are positioned at a predetermined distance from the second ridge. Or the packaging box as described in 2.   The packaging box according to any one of claims 1 to 3, wherein the side plate is provided with an operation portion for breaking the side plate along the second breaking line.   The packaging box according to any one of claims 1 to 4, wherein a notch is provided at a tip end of the inner flap so as to be located in the vicinity of the first breaking portion.

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