JP3221010U - Box sheet - Google Patents

Abstract

[PROBLEMS] To provide a box sheet capable of easily and reliably engaging a lid outer flap with a pair of lid inner flaps. A pair of first side panels 1a and 1b and a pair of second side panels 2a and 2b are formed of a single sheet and are alternately connected in the left-right direction to form a square tubular body in an assembled state. A lid outer flap 3 extending from the upper edge of one first side panel 1a, 1b, and a pair of lid inner flaps 4a, 4b extending from the upper edge of the pair of second side panels 2a, 2b, A sheet for a box that can be assembled in a box shape, wherein the pair of lid inner flaps 4a and 4b have the locking holes 13a and 13b respectively, and the lid outer flap 3 is on the outer surface of the pair of lid inner flaps 4a and 4b A pair of protrusions 10a having a main body 10 which is folded and seals the upper opening of the square tubular body, the main body 10 is formed on both side edges and can be inserted into the pair of locking holes 13a, 13b; The distal end portion and the proximal end portion of the protrusion 10a of each side edge And a pair of arcuate bending easy line 10b to be connected. [Selected figure] Figure 1

Description

  The present invention relates to a box sheet.

  A box body formed by assembling a cardboard sheet is widely used for storage, transportation, etc. of articles. As this corrugated cardboard sheet, a pair of first side panels and a pair of second side panels which are alternately connected in the left-right direction and form a square tubular body in an assembled state, and extend from the upper edge of one first side panel Having an outer lid flap for sealing the upper opening of the rectangular tubular body, and a pair of inner lid flaps extending from the upper edges of the pair of second side panels and folded inside the outer lid flaps It is known.

  From the viewpoint of preventing a gap from being formed in the lid, as the corrugated cardboard sheet, a sheet in which the lid outer flaps can be engaged with the pair of lid inner flaps has been proposed. As such a corrugated cardboard sheet, for example, one has been proposed in which a pair of locking portions are provided on both side edges of the lid outer flap and a slit in which the locking portion can be inserted is provided in the pair of lid inner flaps 2003-112722).

  The corrugated cardboard sheet is configured such that the pair of locking portions can be inserted into the slit by pushing the central portion of the lid outer flap.

Japanese Patent Application Laid-Open No. 2003-112722

  However, when inserting a pair of latching | locking part in a slit by pushing in the center part of a lid | cover outer side flap, it is difficult to fully enlarge the engagement area of a latching | locking part and a slit.

  Further, in the above-mentioned publication, the slit is formed in a U-shape convex toward the base end side of the flap in the lid so that the slit is opened by the pressing of the flap in the lid. However, according to this configuration, there is a high possibility that a gap may be generated between the lid outer flap and the pair of lid inner flaps in the assembled state of the box, or the pair of locking portions may unintentionally slip out of the slit.

  This invention is made in view of such a problem, and makes it a subject to provide the sheet | seat for the box which can engage with an outer lid flap and a pair of inner lid flap easily and reliably.

  A sheet for a box according to the present invention made to solve the above problems comprises a single sheet and is alternately connected in the left-right direction to form a pair of first side panels which form a square cylindrical body in an assembled state and A pair of second side panels, an outer lid flap extending from the upper edge of one of the first side panels, and a pair of inner lid flaps extending from the upper edges of the pair of second side panels; A sheet for a box that can be assembled in a box shape, wherein the pair of lid inner flaps have locking holes respectively, and the lid outer flap is folded over the outer surface of the pair of lid inner flaps, and the square cylinder A main body for sealing the upper opening of the main body, the main body being formed on both side edges, and a pair of protrusions which can be inserted into the pair of locking holes, and a tip more distal than the protrusion of each side edge A pair of arc-shaped easy bending lines connected to the side part and the proximal part Having.

  The box sheet has a pair of arc-shaped easy-to-bend lines connected to the distal end portion and the proximal end portion of the lid outer flap body rather than the projecting portions of the side edges. The pair of projecting portions can be inserted into the pair of locking holes easily and reliably by bending the main body while bending the bending easy line so as to be convex to the outside of the box. Accordingly, the box sheet can easily and reliably engage the lid outer flap with the pair of lid inner flaps.

  The protrusion may be formed at a central portion in the extension direction of the main body, and the bendable line may be connected to a distal end side corner portion and a proximal end side corner portion of the main body. Thus, the protrusion is formed at the central portion in the extension direction of the main body, and the bendable line is connected to the distal end side corner portion and the proximal end side corner portion of the main body. The pair of projecting portions can be easily inserted into the pair of locking holes by bending the pair of bending easy lines.

  It is preferable that a region between the protrusion of the side edge and the bending line is an outwardly convex arc shape. As described above, the region between the protrusion of the side edge and the bending easy line has an arc shape convex outward, whereby the pair of arcs between the protrusion and the bending easy line can be obtained. Can be pressed downward. As a result, the pair of lid inner flaps can be easily inclined downward as a whole, and the pair of projecting portions can be easily inserted into the pair of locking holes.

  It is preferable that the locking hole has a crescent shape that is convex on the tip end side in the extension direction of the flap in the lid. As described above, the locking hole is in the shape of a convex crescent on the distal end side of the in-lid flap in the extending direction, thereby preventing a gap from being formed between the main body and the pair of in-lid flaps in the assembled state. It's easy to do. Moreover, according to this configuration, the pair of projecting portions can be easily inserted into the pair of locking holes by bending the pair of bending easy lines.

  As a ratio of the curvature radius of the said bending easy line with respect to the extension direction length of the said main body, 0.5 or more and 0.8 or less are preferable. As described above, when the ratio of the radius of curvature of the bending easy line to the length in the extending direction of the main body is within the above range, the pair of projecting portions is locked by bending the pair of easy bending lines. Easy to insert in the hole.

  In addition, in this invention, the "left-right direction" means the horizontal direction in the general use aspect assumed in the box formed by assembling the sheet | seat for boxes. Moreover, "upper" means upper on the basis of the said left-right direction. "Outside" means the outer surface of the box. "Arc-shaped" includes a parabolic shape in addition to a perfect circle and an arc shape of an ellipse. Also, "arc-like" includes a pseudo arc-like shape including a straight line.

  As described above, the box sheet according to the present invention can easily and reliably engage the lid outer flap with the pair of lid inner flaps.

It is a typical top view showing a sheet for boxes concerning one embodiment of the present invention. It is a schematic perspective view of the box formed by assembling the sheet | seat for boxes of FIG. It is a schematic perspective view which shows the assembly procedure of the box of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Box sheet]
The sheet | seat for boxes of FIG. 1 consists of a sheet | seat of 1 sheet. The sheet | seat for the said box is connected alternately by the left-right direction, and a pair of 1st side panel 1a, 1b and a pair of 2nd side panel 2a, 2b which form a square cylinder in an assembly state, and one 1st side It comprises a lid outer flap 3 extending from the upper edge of the panel 1a, and a pair of lid inner flaps 4a, 4b extending from the upper edge of the pair of second side panels 2a, 2b (herein, The first side panel 1a connected to the lid outer flap 3 is referred to as "one first side panel 1a", and the first side panel 1b not connected to the lid outer flap 3 is also referred to as "the other first side panel 1b" ). Moreover, the said sheet | seat for boxes is the folding panel 5 extended from the upper edge of the other 1st side panel 1b, a pair of 1st side panel 1a, 1b, and a pair of 2nd side panel 2a, 2b from the lower edge Extending four bottom flaps (first bottom flap 6a extending from the lower edge of the first side panel 1a located outward in the left-right direction, extending from the lower edge of the first side panel 1b located in the lateral center) Bottom flap 6b, a third bottom flap 6c extending from the lower edge of the second side panel 2a provided between the pair of first side panels 1a and 1b, and a second side panel 2b outside in the left-right direction A fourth bottom flap 6d extending from the edge and a glue margin 7 extending from the side edge opposite to the connecting side of the first side panel 1a located on the outer side in the left-right direction with the second side panel 2a . The pair of first side panels 1a and 1b and the pair of second side panels 2a and 2b are connected in an endless manner by sticking the glue margin 7 to the inner surface of the second side panel 2b positioned on the outer side in the left-right direction . The pair of first side panels 1a and 1b and the pair of second side panels 2a and 2b are formed into a square tubular body by being spread in a square tubular shape in a state of being connected in an endless manner. The adhesive margin 7 can be attached to the second side panel 2b using, for example, an adhesive, a stapler or the like. In FIG. 1, a thick solid line indicates a cutting line formed by cutting the sheet, and a thin solid line indicates a ruled line formed by pushing one side of the sheet. Moreover, "lower" means the lower side when the horizontal direction in the general usage mode assumed in the box body formed by assembling the sheet for boxes is the horizontal direction. "Inside" means the inside surface of the box.

  The sheet | seat for the said box can be assembled in a box shape, and is specifically assembled in the box 21 of FIG. The sheet for the box is formed by combining the four bottom flaps 6a to 6d to seal the lower opening of the rectangular cylindrical body to form the bottom, and the folded panel 5 is folded over the inner surface of the rectangular cylindrical body. In addition, the pair of lid inner flaps 4a and 4b are bent at a substantially right angle inside, and the lid outer flap 3 is further folded over the outer surfaces of the pair of lid inner flaps 4a and 4b to form a lid portion. . In addition, the detailed formation procedure of the said cover part is mentioned later.

  The sheet used for the sheet for the box is not particularly limited as long as it has a strength that can maintain the shape of the box 21 formed by assembling the sheet for the box, and, for example, paper such as corrugated sheet or cardboard A sheet, a sheet made of synthetic resin, a laminated sheet of a sheet made of paper and a sheet made of synthetic resin, and the like can be mentioned. Among them, a paper sheet is preferable from the viewpoint of processability, shock absorption, handleability, recyclability, economy and the like, and the pair of projecting portions 10a are bent into a pair of locking holes 13a by bending a pair of easy bending lines 10b described later. , 13b are particularly preferred. Corrugated cardboard for forming the sheet for a box is one in which a core formed of a base paper in a corrugated shape is bonded to a liner, and for example, one side of a corrugated core formed on one liner Corrugated sheet, double-sided corrugated sheet with double-sided corrugated sheet with double-sided corrugated sheet with single-sided corrugated sheet laminated to one side of double-sided corrugated sheet with double-sided corrugated sheet with double-sided corrugated sheet The double-sided corrugated cardboard sheet etc. which further bonded the step top of the sheet together are mentioned. Among these, a double-faced cardboard sheet is preferable in terms of processability, economy, durability and the like. The thickness of the sheet used for the box sheet may be, for example, 1.5 mm or more and 10 mm or less. When the sheet is a double-sided corrugated sheet, the thickness of the sheet may be 5 mm, for example. .

(First side panel)
The pair of first side panels 1a and 1b are formed in a rectangular shape and substantially the same shape. The lateral length of the pair of first side panels 1a and 1b may be larger than the lateral length of the pair of second side panels 2a and 2b. That is, the pair of first side panels 1a and 1b may be a length surface panel that forms the length surface of the box 21.

  The length in the left-right direction of the pair of first side panels 1a and 1b can be appropriately set based on the size etc. of the articles housed in the box 21, but can be, for example, 10 cm or more and 50 cm or less. The length in the vertical direction of the pair of first side panels 1a and 1b can be appropriately set based on the size and the like of the articles housed in the box 21, but can be, for example, 3 cm or more and 30 cm or less.

  At the boundary between the other first side panel 1b connected to the above-described folded panel 5 and the second bottom flap 6b connected to the lower edge of the first side panel 1b, along the boundary between the two. A slit 14 extending in the left-right direction is formed.

(2nd side panel)
The pair of second side panels 2a and 2b are formed in a rectangular shape and substantially the same shape. The pair of second side panels 2a and 2b may be width side panels each having a smaller length in the left-right direction than the pair of first side panels 1a and 1b. The left-right direction length of the pair of second side panels 2a and 2b can be appropriately set based on the size etc. of the articles housed in the box 21, but can be, for example, 10 cm or more and 50 cm or less. The vertical length of the pair of second side panels 2a and 2b can be the same as the vertical length of the pair of first side panels 1a and 1b.

(Flap in lid)
The pair of in-lid flaps 4a and 4b are formed in a rectangular shape and substantially the same shape. The width (length in the left-right direction) of the in-lid flaps 4a, 4b is substantially equal to the length in the left-right direction of the second side panels 2a, 2b.

  The pair of lid inner flaps 4a and 4b have locking holes 13a and 13b, respectively. The locking holes 13a and 13b are formed at the central portion in the width direction of the in-lid flaps 4a and 4b. The locking holes 13a and 13b are elongated in the width direction of the in-lid flaps 4a and 4b. The locking holes 13a and 13b are curved on the proximal end side in the extension direction of the in-lid flaps 4a and 4b from the center in the longitudinal direction toward both ends. In other words, the locking holes 13a and 13b have a crescent shape that is convex toward the end in the extension direction of the in-lid flaps 4a and 4b. Thereby, the said sheet | seat for boxes tends to prevent that a clearance gap is made between the lid outside flap 3 (more specifically, the below-mentioned main body 10) and a pair of lid inside flaps 4a, 4b in an assembled state. Moreover, according to this configuration, the pair of projecting portions 10a can be easily inserted into the pair of locking holes 13a and 13b by bending the pair of bending easy lines 10b as described later.

  It is preferable that the locking holes 13a and 13b have a wide central side in the longitudinal direction (that is, a central side in the width direction of the in-lid flaps 4a and 4b). Thus, the pair of protrusions 10a can be easily inserted into the pair of locking holes 13a and 13b, and the engagement between the pair of protrusions 10a and the pair of locking holes 13a and 13b can be stably made. Easy to hold.

(Cover outside flap)
The lid outer flap 3 extends from the upper edge of one first side panel 1a, is folded over the outer surfaces of the pair of lid inner flaps 4a and 4b, and seals the upper opening of the square cylindrical body with the main body 10 A bent piece 11 extending from the end edge of the main body 10 and being folded over onto the outer surface of the other first side panel 1b in an assembled state, and a difference extending from the end edge of the bent piece 11 and inserted into the slit 14 described above And the insertion piece 12.

[Body]
The main body 10 is substantially rectangular. The maximum width (length in the left-right direction) of the main body 10 is substantially equal to the length in the left-right direction of the first side panels 1a and 1b. Moreover, the extension direction length of the main body 10 is substantially equal to the left-right direction length of 2nd side panel 2a, 2b.

  The main body 10 is formed on both side edges, and is connected to a pair of projecting portions 10a that can be inserted into the pair of locking holes 13a and 13b, and a distal end portion and a proximal end portion of the projecting portions 10a of each side edge And a pair of arc-shaped easy bending lines 10b.

  The protrusion 10 a is defined by a notch connecting the distal corner and the proximal corner of each side edge of the main body 10. Therefore, the tip of the protrusion 10 a in the projecting direction is located inward in the width direction than the corner of the main body 10.

  It is preferable that the protrusion 10 a be formed at the central portion in the extension direction of the main body 10. Thus, the protrusions 10a can be easily formed at equal positions from both ends of the bending easy line 10b, and the protrusions 10a can easily be brought closer to the center in the width direction of the main body 10 by bending the bending easy line 10b. As a result, it is easy to insert the protrusion 10a into the locking holes 13a and 13b.

  The protrusion 10 a is preferably in the shape of a tongue. The width W1 of the base end edge of the protruding portion 10a (the distance between both ends of the protruding portion 10a) is substantially equal to the width W2 of the locking holes 13a and 13b (the distance between both ends in the longitudinal direction of the locking holes 13a and 13b) Is preferred. Further, the horizontal distance L1 between the both ends of the protrusion 10a and the corner of the main body 10 is the vertical distance L2 between the base edge of the in-lid flaps 4a and 4b and the both ends of the locking holes 13a and 13b (in-lid flap It is preferable that the distance in the extension direction of 4a and 4b be approximately equal. According to this configuration, both ends of the projecting portion 10a and both ends of the locking holes 13a and 13b can be reliably engaged, and in the assembled state, there is a gap between the main body 10 and the pair of lid flaps 4a and 4b. It is easy to prevent it from occurring.

  It is preferable that the bending easy line is not formed in the base end edge of the protrusion part 10a. The sheet | seat for the said box has the main body 10 inside, bending a pair of bending easy lines 10b so that it may become convex on the outer side of the box 21 by the bending easy line not being formed in the base end edge of the protrusion part 10a. By bending, the pair of protrusions 10a can be inserted into the pair of locking holes 13a and 13b easily and reliably. Moreover, according to this configuration, it is possible to prevent the pair of protruding portions 10a from unintentionally coming out of the pair of locking holes 13a and 13b.

  The lower limit of the ratio of the width W1 of the base end edge of the protrusion 10a to the extension direction length of the main body 10 is preferably 0.2, and more preferably 0.3. On the other hand, the upper limit of the above ratio is preferably 0.5, and more preferably 0.4. If the ratio is less than the lower limit, it may be difficult to reliably engage the pair of projecting portions 10a and the pair of locking holes 13a and 13b. Conversely, when the ratio exceeds the upper limit, it may not be easy to insert the pair of projecting portions 10a into the pair of locking holes 13a and 13b by bending the pair of bending easy lines 10b.

  The pair of bending easy lines 10 b are, for example, ruled lines formed by pushing the inner surface of the main body 10. It is preferable that the pair of bending easy lines 10b have a circular arc shape of a perfect circle. It is preferable that the pair of bending easy lines 10 b be connected to the distal end side corner portion and the proximal end side corner portion of the main body 10. The box sheet has the bending easy line 10b connected to the front end side corner portion and the base end side corner portion of the main body 10, so that both sides in the width direction of the main body 10 are at both ends in the extension direction of the main body 10 Therefore, the pair of projecting portions 10a can be easily inserted into the pair of locking holes 13a and 13b. In particular, with the projecting portion 10a being formed at the central portion in the extension direction of the main body 10, the box sheet can be easily inserted into the pair of projecting portions 10a by the pair of locking holes 13a and 13b.

  The lower limit of the ratio of the radius of curvature of the bending easy line 10b to the length in the extending direction of the main body 10 is preferably 0.5, and more preferably 0.6. On the other hand, the upper limit of the above ratio is preferably 0.8, and more preferably 0.7. If the ratio is outside the above range, it becomes difficult to bring the pair of projections 10a to the center side in the width direction of the main body 10 by bending the pair of bending easy lines 10b, and the pair of projections 10a is locked It may be difficult to insert the holes 13a and 13b.

  It is preferable that the area | region between the protrusion part 10a of the side edge of the main body 10 and the bending easy line 10b is a convex circular arc shape convex outward. According to this configuration, the box sheet can press the pair of in-lid flaps 4a and 4b downward by the arc-shaped portion 10c between the protrusion 10a and the bending line 10b. As a result, the pair of lid inner flaps 4a and 4b can be easily inclined downward as a whole, and the pair of projecting portions 10a can be easily inserted into the pair of locking holes 13a and 13b.

[Procedure of engagement between projection and locking hole]
Referring to FIG. 3, an engagement procedure between the pair of protrusions 10 a and the pair of locking holes 13 a and 13 b will be described.

  When inserting the pair of projecting portions 10a into the pair of locking holes 13a and 13b, as shown in FIG. 3, while the main body 10 is bent in a mountain fold at the pair of easy bending lines 10b, the first main body 10 is It bends inside with respect to the side panel 1a. The pair of bendable lines 10b are bent until the distal end portions of the pair of projecting portions 10a are inserted into the pair of locking holes 13a and 13b, and the distal ends of the pair of projecting portions 10a are the pair of locking holes 13a and 13b By releasing the bending of the pair of easy bending lines 10b in the state of being inserted in the pair of projecting portions 10a are inserted into the pair of locking holes 13a and 13b across the both ends, The top opening is sealed.

  At this time, the distal end portions of the pair of projecting portions 10a are inserted into the pair of locking holes 13a and 13b by the pair of locking holes 13a and 13b being in the shape of a crescent moon convex on the tip side of the in-lid flaps 4a and 4b. By releasing the bending of the pair of easy bending lines 10b in the state as described above, the entire pair of projecting portions 10a is automatically inserted into the pair of locking holes 13a and 13b.

  Further, by bending in a mountain fold at the pair of easy bending lines 10b, the arc-shaped portions 10c of the side edges of the main body 10 appropriately press the outer surfaces of the pair of in-lid flaps 4a, 4b, and the in-lid flaps 4a, 4b is generally inclined downward with the tip end side. As a result, the inclination angle of the inner surfaces of the pair of projecting portions 10a with respect to the outer surfaces of the pair of in-lid flaps 4a and 4b is increased, and the pair of projecting portions 10a can be easily inserted into the pair of locking holes 13a and 13b. .

[Folded piece]
The bent piece 11 has a base 11a having an equal leg trapezoidal shape extending from the end edge of the main body 10 and an end 11b extending from the end edge of the base 11a.

[Insert piece]
The insertion piece 12 extends from the tip end edge of the tip end 11b. The plug piece 12 is inserted into the above-mentioned slit 14 in the assembled state. The insertion piece 12 has a locking hole 12a that can be engaged with a tongue 5b described later.

(Folded panel)
The folded back panel 5 extends from the tip end edge of the folded back piece 5a substantially the same shape as the first side panel 1b to be folded over on the inner surface of the other first side panel 1b to which the folded back panel 5 is connected. And a tongue 5b. The tongue piece 5b is bent at a substantially right angle to the folding piece 5a in the assembled state, and is superimposed on the inner surface of the bottom formed by the four bottom flaps 6a to 6d. The tongue 5b is engaged with the locking hole 12a formed in the insertion piece 12 in the assembled state.

(Bottom flap)
The four bottom flaps 6a to 6d have a so-called one-touch type configuration (simplified glued assembly type). More specifically, the first bottom flap 6a and the third bottom flap 6c adjacent to the first bottom flap 6a are previously laminated, and the second bottom flap 6b and the fourth bottom flap 6d adjacent to the second bottom flap 6b It is pasted together beforehand. The four bottom flaps 6a to 6d are formed by connecting the pair of first side panels 1a and 1b and the pair of second side panels 2a and 2b in an endless manner to the pair of first side panels 1a and 1b and the pair of first side panels 1a and 1b. The two side panels 2a and 2b are provided in a state of being folded back to the inner surface side. The first bottom flap 6a slides into the inside of the fourth bottom flap 6d by expanding the pair of first side panels 1a and 1b and the pair of second side panels 2a and 2b into a square tube shape. The second bottom flap 6b slides into the inside of the third bottom flap 6c. This assembles the bottom.

<Advantage>
The box sheet has a pair of arc-shaped easy bending lines 10b in which the main body 10 of the lid outer flap 3 is connected to the distal end portion and the proximal end portion of the projecting portions 10a of the side edges. Therefore, by bending the main body 10 while bending the pair of bending easy lines 10b so as to be convex to the outside of the box 21, the pair of locking portions 13a can be easily and surely paired with the pair of locking holes 13a, 13b. Can be inserted into Accordingly, the box sheet can easily and reliably engage the lid outer flap 3 (more specifically, the main body 10) with the pair of lid inner flaps 4a and 4b.

Other Embodiments
The above embodiment does not limit the configuration of the present invention. Therefore, the above-mentioned embodiment can omit, substitute or add the components of each part of the above-mentioned embodiment based on the description of the present specification and technical common sense, and all of them are interpreted as belonging to the scope of the present invention. It should.

  For example, as long as the lid outer flap is folded over the outer surface of the pair of lid inner flaps and has a main body capable of sealing the upper opening of the above-mentioned square cylindrical body, the above-mentioned others It does not have to have a piece of Moreover, it is also possible to set it as the structure which does not have the above-mentioned folding panel extended from the upper edge of the other 1st side panel in the said box sheet | seat.

  The specific configuration for forming the bottom of the box is not limited to the configuration of the above embodiment. For example, the box sheet may be formed at the bottom by one bottom flap extending from the lower edge of one side panel.

  The protrusion is preferably formed at the central portion in the extension direction of the main body from the viewpoint of facilitating insertion into the locking hole, but depending on the characteristics required for the box body, the extension direction of the main body It may be formed on the end side of In addition, although it is preferable that the bendable line is connected to the front end side corner portion and the base end side corner portion of the main body from the viewpoint of facilitating insertion of the protrusion into the locking hole, the box body is required May be connected to portions other than the distal end side corner portion and the proximal end side corner portion of the side edge of the main body depending on the characteristics and the like.

  The region between the protrusion of the side edge of the body and the fold line may not necessarily be an outwardly convex arc. Further, the shape of the locking holes formed in the pair of lid inner flaps can be designed according to, for example, the shape of the projecting portion, and not necessarily in the shape of a convex crescent moon on the tip side in the extension direction of the lid inner flaps It is also good.

  As mentioned above, since the sheet | seat for boxes which concerns on this invention can engage a lid outer flap and a pair of lid inner flaps easily and reliably, it is suitable for storage of articles | goods, conveyance, etc.

1a, 1b 1st side panel 2a, 2b 2nd side panel 3 lid outside flap 4a, 4b inside lid 5 back panel 5a folding back piece 5b tongue piece 6a 1st bottom flap 6b 2nd bottom flap 6c 3rd bottom flap 6d 4 bottom flap 7 glue margin 10 body 10a protrusion 10b easy bending line 10c arc-shaped part 11 bent piece 11a base 11b tip 12 inserted piece 12a locking hole 13a, 13b locking hole 14 slit 21 box 21

Claims (5)

It consists of one sheet,
A pair of first side panels and a pair of second side panels alternately connected in the left-right direction and forming a square tubular body in an assembled state;
An outer lid flap extending from an upper edge of one of the first side panels;
And a pair of lid inner flaps extending from the upper edge of the pair of second side panels.
Each of the pair of lid inner flaps has a locking hole,
The lid outer flap has a main body which is folded over the outer surface of the pair of lid inner flaps and seals the upper opening of the square cylindrical body.
The main body is formed on both side edges, and is connected to a pair of protrusions which can be inserted into the pair of locking holes, and a distal end portion and a proximal end portion of the side edge with respect to the protrusions. A sheet for a box having an arc-shaped easy-to-fold line. The protrusion is formed at a central portion in the extension direction of the main body,
The box sheet according to claim 1, wherein the bending facilitation line is connected to the front end side corner portion and the base end side corner portion of the main body.   The box sheet according to claim 1 or 2, wherein a region between the protrusion of the side edge and the bending line is an outwardly convex arc.   4. The box sheet according to claim 1, wherein the locking hole has a crescent shape which is convex toward the front end side in the extension direction of the flap in the lid.   The box sheet according to any one of claims 1 to 4, wherein the ratio of the radius of curvature of the bending easy line to the length in the extension direction of the main body is 0.5 or more and 0.8 or less.

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