JP3225319U - Box sheet - Google Patents

Abstract

Provided is a box sheet that has a buffer function and can be assembled into a box body that can easily seal the top surface side. Kind Code: A1 A box sheet formed from a single sheet material and assemblable into a box body, which is alternately connected in the left-right direction and is assembled in a rectangular cylindrical shape. A width panel 2, a pair of flanges 5 extending from upper edges of the pair of width panels and bent inward and vertically, and extending from distal edges of the pair of flanges, and supporting the distal edges of the flanges from below in an assembled state. A pair of support panels (6), and a pair of lid flaps (7) extending from the upper edges of the pair of long-side panels and configured so that their leading edges can abut each other, wherein the lid flaps overlap the flange in an assembled state. It has a pair of thin portions 71 with concave inner surfaces at both end portions on the end side. [Selection] Figure 2

Description

  The present invention relates to a box sheet.

  As a box (packaging container) formed from a sheet material such as a corrugated cardboard sheet, the inner wall is arranged at an interval inside the side wall to absorb external impact and reduce the force applied to the items to be stored. One having a buffering function is used (see JP-A-8-310578).

  The above-mentioned conventional packaging container is provided with a side plate that is erected from the opposite side of the bottom plate upwardly in a valley-folding manner and folded back while forming a buffer space inside the container on the way, for example, for protecting electronic equipment to be packaged. Can be achieved.

JP-A-8-310578

  If a lid flap is provided on the above-mentioned conventional packaging container so that the top side can be closed, the lid flap interferes with the side plate forming the buffer space, and the tip side of the lid flap is easily lifted. And it is difficult to seal the top side. Since the above-mentioned conventional packaging container is open on the top side in this way, it is necessary to use it by, for example, housing it in an outer box.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a box sheet having a buffer function and capable of assembling a box body capable of easily sealing a top surface side.

  The box sheet according to one embodiment of the present invention is a box sheet formed from one sheet material and assemblable into a box body. A length face panel and a pair of width face panels, a pair of flanges extending from upper edges of the pair of width face panels and bent inward and vertically, and extending from tip edges of the pair of flanges, the flanges being assembled. And a pair of lid flaps extending from the upper edge of the pair of long side panels and configured such that the tip edges can abut against each other. A pair of thin portions with concave inner surfaces are provided at both ends on the base end side overlapping the flange in the assembled state.

  The box sheet of the present invention has a buffering function and can be assembled into a box body that can easily seal the top side.

FIG. 1 is a schematic plan view (exploded view) showing a box sheet according to one embodiment of the present invention. FIG. 2 is a schematic perspective view showing a box obtained by assembling the box sheet of FIG. FIG. 3 is a schematic perspective view showing a case where the top side of the box of FIG. 2 is closed by a lid flap. FIG. 4 is a schematic cross-sectional view taken along line AA of the box of FIG. FIG. 5 is a schematic cross-sectional view showing a case where a thin portion is not provided on the lid flap in the box body of FIG.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention are listed and described.

  The box sheet according to one embodiment of the present invention is a box sheet formed from one sheet material and assemblable into a box body. A length face panel and a pair of width face panels, a pair of flanges extending from upper edges of the pair of width face panels and bent inward and vertically, and extending from tip edges of the pair of flanges, the flanges being assembled. And a pair of lid flaps extending from the upper edge of the pair of long side panels and configured such that the tip edges can abut against each other. A pair of thin portions with concave inner surfaces are provided at both ends on the base end side overlapping the flange in the assembled state.

  In the box sheet, a buffer space can be formed by the flange and the support panel in an assembled state. In addition, the box sheet is provided with a pair of thin portions having concave inner surfaces at both end portions on the base end side overlapping with the flange in the assembled state on the lid flap, thereby reducing interference between the flange and the lid flap. Can be easily butted against each other. Therefore, by using the box sheet, it is possible to obtain a box having a cushioning function and capable of easily sealing the top side.

  Preferably, the thin portion has a rectangular shape wider than the extension length of the flange. By thus making the thin portion a rectangular shape wider than the extension length of the flange, the interference between the lid flap and the flange can be effectively suppressed with a relatively small area. Therefore, it is possible to further easily seal the top surface side of the box formed by assembling the box sheet.

  The difference between the width of the thin portion and the extension length of the flange is preferably 20 mm or less. As described above, by setting the difference between the width of the thin portion and the extension length of the flange to be equal to or less than the upper limit, it is possible to further easily seal the top surface side while maintaining the strength of the lid flap.

  The pair of side edges of the flange may be inclined inward along the extension direction. By inclining the pair of side edges of the flange inward along the extension direction in this manner, interference between the lid flap and the flange can be suppressed. Therefore, it is possible to further easily seal the top surface side of the box formed by assembling the box sheet.

  A pair of bottom inner flaps extending from the lower edges of the pair of width surface panels and a pair of bottom outer flaps extending from the lower edges of the pair of length surface panels and configured such that their leading edges can abut each other. Furthermore, the pair of support panels have an inner wall plate that is bent inside the width surface panel in an assembled state, and a folded piece that is overlapped on the inner surface side of the bottom inner flap in the assembled state. It is preferable that the flap has a slit at the center of the base end edge, and the inner wall plate has a projection at the tip that can be fitted with the slit of the bottom inner flap. In this manner, in the assembled state, the folded-back piece provided on the inner surface side of the bottom inner flap is provided, and the convex portion which can be fitted with the slit of the bottom inner flap is provided on the inner wall plate. It becomes easy to maintain, and an excellent buffer function can be maintained. Further, the support panel can be fixed by fitting the convex portion with the slit of the bottom inner flap, so that it is easy to assemble into the box.

  Note that, in the present invention, the “left-right direction” means a horizontal direction in an assumed general usage mode of a box formed by assembling a box sheet, and “up” and “down” are assumed. It means up and down in a general usage mode, but is not intended to limit the orientation of the box when used. Also, “inside” and “outside” refer to the inside and outside of the box, respectively.

[Details of embodiment of the present invention]
Hereinafter, a box sheet according to an embodiment of the present invention will be described with reference to the drawings as appropriate.

  The box sheet according to one embodiment of the present invention is a box sheet formed of one sheet material as shown in FIG. 1 and can be assembled into a box body as shown in FIG. In FIG. 1, a thick solid line indicates a cutting line obtained by cutting the sheet material, and a thin solid line indicates a ruled line formed by creasing the sheet material.

  As the sheet material forming the box sheet, for example, a corrugated cardboard sheet, a plastic board, cardboard, or the like can be used, and among them, a corrugated cardboard sheet is suitably used.

  The corrugated cardboard sheet is not limited to a sheet in which both sides of one core are sandwiched between a pair of liners, and may be a so-called double flute in which the core is sandwiched between three liners. A so-called single-sided cardboard in which a liner is adhered to only one side of the core may be used.

  The lower limit of the thickness of the sheet material is preferably 3 mm from the viewpoint of strength. On the other hand, the upper limit of the thickness of the sheet material is not particularly limited, but is preferably 8 mm from the viewpoint of ease of assembly into a box.

  The box sheets are connected alternately in the left-right direction (x direction in FIG. 1), and are assembled into a rectangular tube shape. A pair of length-side panels 1 and a pair of width-side panels 2 and a lower edge of the pair of width-side panels 2 are provided. And a pair of bottom outer flaps 4 extending from the lower edges of the pair of length-face panels 1 and extending from the lower edges of the pair of length-face panels 1, and a pair of bottom outer flaps 4 and a pair of width-face panels 2. A pair of flanges 5 extending from the upper edge and bent inward and vertically; a pair of support panels 6 extending from the distal edges of the pair of flanges 5 and supporting the distal edges of the flanges 5 from below in an assembled state; A pair of lid flaps 7 extending from the upper edge of the length-side panel 1 and configured such that the leading edges thereof can abut each other, and a margin portion 8 are provided.

<Length panel and width panel>
The length side panel 1 and the width side panel 2 are substantially square. Further, the pair of length side panels 1 have the same size, and the pair of width side panels 2 have the same size.

  The length of the length panel 1 in the vertical direction (the length in the y direction of FIG. 1) is equal to the length of the width panel 2 in the vertical direction. Further, the length in the left-right direction of the length panel 1 (the length in the x direction in FIG. 1) is equal to or greater than the length in the left-right direction of the width panel 2.

  The length of the length-side panel 1 and the width-side panel 2 in the vertical direction, the length of the length-side panel 1 in the left-right direction, and the length of the width-side panel 2 in the left-right direction are determined by the box body assembled by the box sheet. It is determined appropriately so as to be able to correspond to the size and the number of the stored items assumed to be stored.

<Bottom inner flap and outer bottom flap>
The pair of bottom inner flaps 3 and the pair of bottom outer flaps 4 have a substantially square shape, and are configured to be able to close the bottom side of the box body to be assembled. That is, the pair of bottom inner flaps 3 and the pair of bottom outer flaps 4 are bent at right angles to the extending length surface panel 1 and width surface panel 2 at the time of assembly so that the bottom inner flap 3 is on the inside. To form the bottom of the box.

  The height (the length in the extension direction, the length in the y direction in FIG. 1) of the bottom outer flap 4 is set, for example, to the width of the width panel 2 so that the leading edges of the pair of bottom outer flaps 4 can abut each other. １ ／ of the width. Thereby, the bottom side of the box can be closed.

  On the other hand, the height of the inner bottom flap 3 is not particularly limited, but can be equal to the height of the outer bottom flap 4.

  In addition, the width (length in the x direction of FIG. 1) of the inner bottom flap 3 and the outer bottom flap 4 is not particularly limited, but is set to be equal to the width of the extended length panel 1 and the width panel 2 respectively. Is preferred.

  As shown in FIG. 1, the pair of bottom inner flaps 3 have a slit 3a at the center of the base end edge. The slit 3a has a size that can be fitted to a protrusion 61a provided on an inner wall plate 61 of the support panel 6 described later. Specifically, the length of the slit 3a in the left-right direction is preferably equal to the width of the base end side of the protrusion 61a, and the length in the vertical direction is the thickness of the protrusion 61a, that is, the sheet forming the box sheet. It should be equal to the thickness of the material.

<Flange>
As shown in FIG. 1, the flange 5 has an isosceles trapezoidal shape in which a leading edge is a short side. That is, a pair of side edges of the flange 5 are inclined inward along the extending direction. By inclining the pair of side edges of the flange 5 inward along the extending direction in this manner, interference between the lid flap 7 and the flange 5 can be suppressed. Therefore, it is possible to further easily seal the top surface side of the box formed by assembling the box sheet.

  It is preferable that the length of the lower base (side on the base edge side) of the flange 5 having the shape of an isosceles trapezoid is equal to the length of the width surface panel 2 in the left-right direction. In addition, the upper bottom of the flange 5 (side on the leading edge side) is shorter than the lower base of the flange 5 as described above, and the lower limit of the difference in length is preferably 5 mm, more preferably 7 mm. On the other hand, the upper limit of the difference is preferably 20 mm, more preferably 15 mm. If the above difference is less than the above lower limit, the effect of further facilitating the sealing of the top surface obtained by forming the flange 5 into an equilateral trapezoidal shape may be insufficient. Conversely, if the difference exceeds the above upper limit, when assembled as a box, the gap generated between the length surface panel 1 and the end of the flange 5 becomes too large, and the container is caught in this gap, There is a possibility that it may enter between the width panel 2 and the inner wall plate 61.

  As a minimum of extension length of flange 5, 20 mm is preferred and 25 mm is more preferred. On the other hand, as a maximum of extension length of flange 5, 40 mm is preferred and 35 mm is more preferred. When the extension length of the flange 5 is less than the lower limit, the interference space is insufficient due to the flange 5 and the support panel 6 formed in the assembled state, and the interference function of the box body assembled with the box sheet is insufficient. There is a possibility that. Conversely, if the extension length of the flange 5 exceeds the upper limit, the capacity of the box body capable of storing the contents is reduced, and the storage capacity may be reduced.

  At the boundary between the flange 5 and the width surface panel 2, a so-called lead ruled line having perforations formed by intermittently cutting the sheet material and ruled lines connecting the perforated lines for facilitating bending is provided. It is good to be formed.

<Support panel>
The pair of support panels 6 have an inner wall plate 61 bent inside the width panel 2 in the assembled state, and a folded piece 62 overlapped on the inner surface side of the bottom inner flap 3 in the assembled state. In addition, the inner wall plate 61 has a convex portion 61a at the tip that can be fitted to the slit 3a of the bottom inner flap 3.

  In this manner, the folded piece 62 is provided on the inner surface side of the bottom inner flap 3 in the assembled state, and the convex portion 61a that can be fitted to the slit 3a of the bottom inner flap 3 is provided on the inner wall plate 61. This makes it easier to keep the panel 2 perpendicular to the panel 2, thereby maintaining an excellent cushioning function. In addition, since the support panel 6 can be fixed by fitting the protrusion 61a with the slit 3a of the inner bottom flap 3, assembly to the box is easy.

  The inner wall plate 61 and the folded piece 62 have a substantially rectangular shape. It is preferable that the left and right lengths of the inner wall plate 61 and the folded piece 62 are equal, and the length is preferably equal to the left and right length of the distal end edge of the flange 5. In this way, by making the length in the left-right direction of the inner wall plate 61, the folded piece 62, and the distal end edge of the flange 5, the flange 5 can be more stably supported by the support panel 6.

  When the protrusion 61 a is fitted to the slit 3 a of the bottom inner flap 3, the inner wall plate 61 is fixed such that the distal end edge thereof comes into contact with the base end edge of the bottom inner flap 3. The extended length of the inner wall plate 61 is such that the distal end edge of the flange 5 can be supported from below so that the flange 5 continuing to the base end is perpendicular to the width panel 2 in this fixed state. You. That is, the inner wall plate 61 faces the width panel 2 at an angle.

  The lower limit of the extension length of the folded piece 62 is preferably 20 mm, more preferably 30 mm. On the other hand, the upper limit of the extension length of the folded piece 62 is preferably 60 mm, more preferably 50 mm. If the extension length of the folded piece 62 is less than the lower limit, the protrusion 61a of the inner wall plate 61 fitted to the slit 3a of the bottom inner flap 3 may be likely to come off. Conversely, if the extension length of the folded piece 62 exceeds the above upper limit, even if the slit 3a of the bottom inner flap 3 and the projection 61a of the inner wall plate 61 are fitted, the leading edge of the folded piece 62 May easily float from the bottom inner flap 3, and there is a possibility that a contained matter may enter between the folded piece 62 and the bottom inner flap 3.

  The protruding portion 61 a of the inner wall plate 61 is provided substantially at the center of the tip edge of the inner wall plate 61. Further, it is preferable that the convex portion 61a is in the shape of an equilateral trapezoid having a short edge at the front edge, that is, the width gradually decreases toward the front edge. In this manner, by forming the convex portion 61a into the shape of an equilateral trapezoid, the convex portion 61a can be easily fitted into the slit 3a of the inner flap 3.

  As a minimum of the width of the base end side of convex part 61a, 30 mm is preferred and 35 mm is more preferred. On the other hand, the upper limit of the width on the base end side of the convex portion 61a is preferably 50 mm, more preferably 45 mm. If the width on the base end side of the protrusion 61a is less than the lower limit, the strength of the protrusion 61a may be insufficient. Conversely, if the base end side width of the convex portion 61a exceeds the above upper limit, the width of the slit 3a of the bottom inner flap 3 needs to be increased, and the strength of the bottom inner flap 3 may be reduced.

  The width of the convex portion 61a on the distal end side is preferably smaller than the width on the proximal end side as described above, and the difference can be, for example, 2 mm or more and 5 mm or less. If the difference is less than the lower limit, the effect of facilitating the fitting of the projection 61a into the slit 3a may be insufficient. Conversely, if the difference exceeds the upper limit, the strength of the protrusion 61a is insufficient, and the protrusion 61a may be bent when fitted.

  The height of the protrusion 61a (the length of the support panel 6 in the extending direction) is appropriately determined according to the thickness of the sheet material forming the box sheet, and can be, for example, 5 mm or more and 10 mm or less. If the height of the projection 61a is less than the lower limit, the projection 61a of the inner wall plate 61 fitted to the slit 3a of the bottom inner flap 3 may be easily detached. Conversely, when the height of the convex portion 61a exceeds the upper limit, the distal end edge of the inner wall plate 61 is lifted by the convex portion 61a and does not sufficiently contact the base end edge of the bottom inner flap 3, so that the flange 5 May be insufficiently supported.

  Note that a lead ruled line may be formed at the boundary between the inner wall plate 61 and the flange 5 to facilitate bending. Also, regarding the boundary between the inner wall plate 61 and the folded piece 62, a cutting line is formed at the boundary between the convex portion 61a and the folded piece 62, and a lead ruled line is formed at the boundary between the inner wall plate 61 excluding the convex portion 61a. It is good to be.

<Lid flap>
As shown in FIG. 3, the lid flap 7 can seal the top side of the box by abutting the tips thereof.

  The height of the lid flap 7 (the length in the extension direction, the length in the y direction in FIG. 1) is set to, for example, the width of the width panel 2 so that the leading edges of the pair of lid flaps 7 can abut each other. It is set to 1/2. Thereby, the top surface side of the box can be closed.

  The width of the lid flap 7 (the length in the x direction in FIG. 1) is not particularly limited, but is preferably equal to the width of the extended length surface panel 1.

  The lid flap 7 has a pair of thin portions 71 whose inner surfaces are depressed at both ends on the base end side overlapping the flange 5 in an assembled state. The thin portion 71 is formed, for example, by crushing the inner surface of the sheet. As the crushing process, for example, there is a method of forming multiple ruled lines (a plurality of parallel ruled lines) on the inner surface of a sheet.

  As shown in FIG. 1, the thin portion 71 has a rectangular shape wider than the extension length of the flange 5. Specifically, the thin portion 71 has one end of the base edge of the lid flap 7 as an apex, and two sides having the apex as end points are located on the base edge and the side edge of the lid flap 7. The length of the side located on the side edge of the lid flap 7, that is, the width of the thin portion 71 is larger than the extension length of the flange 5. Since the thin portion 71 has a rectangular shape wider than the extension length of the flange 5, the interference between the lid flap 7 and the flange 5 can be effectively suppressed with a relatively small area. Therefore, it is possible to further easily seal the top surface side of the box formed by assembling the box sheet.

  The upper limit of the difference between the width of the thin portion 71 and the extension length of the flange 5 is preferably 20 mm, more preferably 15 mm. If the difference exceeds the upper limit, the effect of further easily sealing the top surface side of the box becomes difficult to improve, and only the strength of the lid flap 7 may be reduced. On the other hand, the lower limit of the difference is not particularly limited and may be 0 mm, but is more preferably 5 mm. By setting the difference to be equal to or larger than the lower limit, the interference between the lid flap 7 and the flange 5 can be more reliably suppressed.

  The lower limit of the length of the thin portion 71 in the left-right direction is preferably 30 mm, more preferably 35 mm. On the other hand, the upper limit of the length of the thin portion 71 in the left-right direction is preferably 60 mm, more preferably 50 mm. If the length of the thin portion 71 in the left-right direction is less than the above lower limit, it may be difficult to seal the top surface side of a box formed by assembling the box sheet. Conversely, when the length of the thin portion 71 in the left-right direction exceeds the above upper limit, the effect of making it easier to seal the top surface side of the box becomes difficult to improve, and only the strength of the lid flap 7 is reduced. There is a risk.

  Hereinafter, the effect of the thin portion 71 will be described with reference to FIGS. 4 and 5. FIG. 4 shows a box body obtained by assembling the box sheet, in which the lid flap 7 is closed. Since the flange 5 is thick, the surface of the flange 5 is located above the end face of the length panel 1 in the assembled state. In the box sheet, the lid flap 7 has a thin portion 71 on the base end side, and the thin portion 71 is wider than the extension length of the flange 5. For this reason, when the lid flap 7 is closed, the base end side of the lid flap 7 does not contact the surface of the flange 5, and the boundary 71 a with the thin portion 71 on the distal end side of the lid flap 7 contacts the flange 5. Can be bent up. That is, in the box body formed by assembling the box sheet, the lid flap 7 can be bent until it is substantially perpendicular to the length panel 1. Therefore, the top side of the box can be sealed.

  On the other hand, as shown in FIG. 5, when the lid flap 17 is a box sheet having no thin portion, when the lid flap 17 is closed, first, the base end side of the lid flap 17 is placed on the surface of the flange 5. Contact. In the assembled state, the surface of the flange 5 is located above the end face of the length panel 1, so that the lid flap 17 cannot be bent further at a relatively shallow angle with respect to the length panel 1. Therefore, if the lid flap 17 does not have a thin portion, it is difficult to seal the top side of the box.

<Glue part>
The glue margin portion 8 is provided to connect one side end and the other side end of the pair of length-side panels 1 and the pair of width-side panels 2 that are alternately connected in the left-right direction. That is, when a pair of length-side panels 1 and a pair of width-side panels 2 connected in the left-right direction are assembled into a rectangular tube, the width-side panel 2 located at the other side end where the glue margin 8 is not provided is It is possible to abut the glue margin 8. By affixing the contact portion of the width panel 2 to the glue margin 8, the pair of length panels 1 and the pair of width panels 2 can be made endless. Alternatively, they may be connected by wire bonding or the like instead of sticking.

<Box assembly method>
The box assembly method for assembling the box sheet into a box includes a square tubular section assembling step, a bottom assembling step, a buffer space assembling step, and a lid assembling step.

(Square tube assembly process)
In the square tubular part assembling step, a pair of length side panels 1 and a pair of width side panels 2 which are alternately connected in the left-right direction are assembled into a square tubular shape.

  Specifically, the following procedure is used. First, of the pair of length-side panels 1 and the pair of width-side panels 2 that are alternately connected in the left-right direction, the length-side panel 1 located at one side end (the left side in FIG. 1) is moved to the adjacent width-side panel. 2, and the width panel 2 located on the other side end (right side in FIG. 1) is folded on the inner surface of the adjacent length panel 1. Then, the glue margin portion 8 is attached to the inner surface on the other side in the left-right direction of the width panel 2 (on the side opposite to the side connected to the length panel 1). Thereby, the pair of length side panels 1 and the pair of width side panels 2 are connected endlessly. The box sheet is provided to the user (user of the box) in this state. The glue margin 8 can be attached to the width panel 2 using, for example, an adhesive, a stapler, or the like.

  Next, the pair of length-side panels 1 and the pair of width-side panels 2 connected endlessly are expanded into a square tubular shape. Thereby, the side surface of the box is assembled in a square tube shape.

(Bottom assembly process)
In the bottom assembling step, the bottom of the box is assembled by the pair of bottom inner flaps 3 and the pair of bottom outer flaps 4.

  Specifically, the following procedure is used. First, a pair of bottom inner flaps 3 are bent inside a rectangular cylindrical box so as to be perpendicular to the width panel 2. Next, a pair of bottom outer flaps 4 are bent at right angles to the length panel 1 so as to be in contact with the outer surfaces thereof. Since the pair of bottom outer flaps 4 are configured so that the leading edges can be abutted against each other, a bottom portion is formed by sticking, for example, a sealing tape to the abutted portion.

(Assembly process of buffer space)
In the buffer space assembling step, the buffer space is assembled inside the pair of width side panels 2 by the pair of flanges 5 and the pair of support panels 6. This buffer space is assembled for each width panel 2 by a flange 5 and a support panel 6 connected thereto.

  Specifically, the following procedure is used. First, the flange 5 is bent inside the box so as to be perpendicular to the width panel 2. Further, with respect to the support panel 6 connected to the flange 5, the inner wall plate 61 is mountain-folded, and the folded piece 62 is valley-folded. That is, the inner wall plate 61 is bent downward, and in the state where the inner wall plate 61 is bent downward, the folded piece 62 is placed inside the box (on the opposite side of the inner wall plate 61 from the width panel 2) to the bottom inner flap 3. It is folded along. In this state, when the inner wall plate 61 is pushed in such that the leading edge of the inner wall plate 61 overlaps the base edge of the bottom inner flap 3, the projection 61 a of the inner wall plate 61 fits with the slit 3 a of the bottom inner flap 3. , The support panel 6 is fixed. Thereby, a buffer space sandwiched between the inner wall plate 61 and the width panel 2 is assembled.

(Lid assembly process)
In the lid assembling step, a lid for sealing the top side of the box is assembled by the pair of lid flaps 7.

  Specifically, a pair of lid flaps 7 are bent so as to be perpendicular to the length panel 1. Since the pair of lid flaps 7 are configured to be able to butt the leading edges thereof, the lid portion is formed by sticking, for example, a sealing tape to the butt portion.

  As described above, the box sheet can be assembled into a box.

<Advantages>
In the box sheet, a buffer space can be formed by the flange 5 and the support panel 6 in an assembled state. In addition, the box sheet is provided with a pair of thin portions 71 whose inner surfaces are recessed at both ends on the base end side overlapping with the flange 5 in the assembled state on the lid flap 7 so that interference between the flange 5 and the lid flap 7 is prevented. This makes it easier to abut the ends of the lid flaps 7. Therefore, by using the box sheet, it is possible to obtain a box having a cushioning function and capable of easily sealing the top side.

[Other Embodiments]
The above embodiment does not limit the configuration of the present invention. Therefore, in the above-described embodiment, it is possible to omit, replace, or add the components of each part of the embodiment based on the description and the common technical knowledge in the present specification, and all of them are interpreted as belonging to the scope of the present invention. Should.

  In the above embodiment, the case where the flange has the shape of an isosceles trapezoid has been described, but the shape of the flange is not limited to the shape of an isosceles trapezoid, and may be, for example, a square shape.

  In the above embodiment, the case where the thin portion of the lid flap has a rectangular shape wider than the extension length of the flange has been described.However, the size and shape of the thin portion may be appropriately changed within a range not to lose the effect of the present invention. Can be.

  In the above embodiment, the case where the support panel is fixed by fitting the slit of the bottom inner flap and the projection of the inner wall plate is described, but the method of fixing the support panel is not limited to this. For example, it is also possible to fix the cut back piece by bonding it to the bottom inner flap. In this case, the slit of the bottom inner flap and the projection of the inner wall plate can be omitted.

  In the above embodiment, the case where the support panel has the inner wall plate and the folded pieces has been described, but the configuration of the support panel is not limited to this. Other configurations can be employed as long as the distal end edge of the flange is supported from below in the assembled state. For example, the support panel may be constituted only by the inner wall plate.

  As described above, the box sheet of the present invention can assemble a box body having a cushioning function and capable of easily sealing the top side.

DESCRIPTION OF SYMBOLS 1 Length panel 2 Width panel 3 Inner bottom flap 3a Slit 4 Outer bottom flap 5 Flange 6 Support panel 61 Inner wall plate 61a Convex part 62 Folding piece 7, 17 Lid flap 71 Thin part 71a Boundary 8 Glue margin

Claims (5)

A box sheet which is formed from one sheet material and can be assembled into a box body,
A pair of length-side panels and a pair of width-side panels, which are alternately connected in the left-right direction and are assembled into a square tubular shape,
A pair of flanges extending from upper edges of the pair of width face panels and being bent inward and vertically,
A pair of support panels extending from the leading edges of the pair of flanges and supporting the leading edges of the flanges from below in an assembled state,
A pair of lid flaps extending from the upper edge of the pair of length surface panels and configured such that their leading edges can abut each other,
A box sheet in which the lid flap has a pair of thin portions with concave inner surfaces at both ends on the base end side overlapping the flange in an assembled state.   The box sheet according to claim 1, wherein the thin portion has a rectangular shape wider than an extension length of the flange.   The box sheet according to claim 2, wherein a difference between the width of the thin portion and the extension length of the flange is 20 mm or less.   4. The box sheet according to claim 1, wherein the pair of side edges of the flange are inclined inward along the extending direction. 5. A pair of bottom inner flaps extending from lower edges of the pair of width side panels,
A pair of bottom outer flaps extending from lower edges of the pair of length surface panels and configured such that tip edges thereof can abut each other,
The pair of support panels,
An inner wall plate that is bent inside the width panel in an assembled state,
A folded piece that is overlapped on the inner surface side of the bottom inner flap in an assembled state,
The pair of bottom inner flaps have a slit at the center of the base edge,
The box sheet according to any one of claims 1 to 4, wherein the inner wall plate has a convex portion at a front end that can be fitted with a slit of the bottom inner flap.

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