JP3234173U - Box sheet - Google Patents

Abstract

[Problem] To provide a box sheet capable of properly maintaining the folded state of flaps. [Solution] A box sheet 10 to be assembled into a box body, comprising a pair of first side panels 1a, 1b and a pair of second side panels 2a, 2b that face each other when assembled, and a pair of outer flaps 3a, 3b, 5a, 5b that extend from one side edge in the vertical direction of the pair of first side panels and are folded inward, a plurality of projections 11 that project toward the tip side of the outer flap are provided at intervals at the boundary between the first side panel and the outer flap, the projections are defined by a pair of side slits that extend from the boundary between the first side panel and the outer flap toward the tip side of the outer flap and an end slit that connects the tips of the pair of side slits to each other, the end slits are curved, and the shortest distance between the boundary line and the end slits in the extension direction of the outer flap is 0.1 to 0.9 times the sheet thickness. [Selected Figure] Figure 1

Description

The present invention relates to a box sheet.

Boxes assembled from corrugated cardboard sheets and the like are widely used for storing and transporting articles. The corrugated cardboard sheet includes a pair of first side panel and a pair of second side panels that are alternately connected in the left-right direction, and a lid flap that extends from the upper edges of the first side panel and the second side panel, respectively. And a bottom flap extending from the lower edge of the first side panel and the second side panel, respectively, and having a structure that can be assembled into a type A (mandarin orange box type) box is known.

It is desired that the box body can surely maintain the bent state of the lid flap or the bottom flap. From this point of view, it has been proposed to provide a locking mechanism at the boundary between the side panel and the flap in order to prevent the bent flap from returning to its original position (see JP-A-7-205956). ..

Japanese Unexamined Patent Publication No. 7-205956

The above-mentioned publication describes that a plurality of U-shaped cut lines protruding from the base end edge of the flap toward the side panel are provided, and further, a bending perforation is provided between these cut lines. The above-mentioned publication describes that when a flap is bent, the flap can be prevented from returning to its original position by being caught by a protrusion defined by a notch line at the base end edge of the flap.

However, there is room for improvement in this configuration from the viewpoint of suppressing the return of the flap.

The present invention has been made in view of such inconvenience, and an object of the present invention is to provide a box sheet capable of appropriately maintaining a bent state of a flap.

The box sheet according to one aspect of the present invention is a box sheet that is assembled into a box body, and is a pair of first side panel and a pair of second side panels facing each other in an assembled state, and a pair of first side panels. A pair of outer flaps extending from one side edge in the vertical direction of the side panel and being bent inward are provided, and the boundary portion between the first side panel and the outer flap is directed toward the tip end side of the outer flap. A pair of side portions extending from the boundary line between the first side surface panel and the outer flap toward the tip end side of the outer flap. It is defined by a slit and an end slit connected to each other at the tips of the pair of side slits, and the end slit is curved, and the boundary line in the extending direction of the outer flap and the above boundary line. The shortest distance from the end slit is 0.1 times or more and 0.9 times or less the sheet thickness.

The box sheet according to one aspect of the present invention can appropriately maintain the bent state of the flap.

FIG. 1 is a schematic plan view showing a box sheet according to an embodiment of the present invention. FIG. 2 is a schematic partially enlarged view showing a boundary portion between the first side panel of the box sheet of FIG. 1 and the flap outside the lid. FIG. 3 is a schematic perspective view showing a box body formed by assembling the box sheet of FIG. 1. FIG. 4 is a schematic partially enlarged view showing a boundary portion between the first side surface panel and the outer lid flap in the box body of FIG.

[Explanation of Embodiments of the present invention]
First, embodiments of the present invention will be listed and described.

The box sheet according to one aspect of the present invention is a box sheet that is assembled into a box body, and is a pair of first side panel and a pair of second side panels facing each other in an assembled state, and a pair of first side panels. A pair of outer flaps extending from one side edge in the vertical direction of the side panel and being bent inward are provided, and the boundary portion between the first side panel and the outer flap is directed toward the tip end side of the outer flap. A pair of side portions extending from the boundary line between the first side surface panel and the outer flap toward the tip end side of the outer flap. It is defined by a slit and an end slit connected to each other at the tips of the pair of side slits, and the end slit is curved, and the boundary line in the extending direction of the outer flap and the above boundary line. The shortest distance from the end slit is 0.1 times or more and 0.9 times or less the sheet thickness.

The box sheet has a pair of side slits extending from the boundary line between the first side surface panel and the outer flap toward the tip end side of the outer flap at the boundary portion between the first side surface panel and the outer flap. And a projecting piece defined by an end slit connected to each other at the tips of the pair of side slits are provided, and when the outer flap is bent substantially perpendicular to the first side panel. In addition, the base end edge of the outer flap comes into contact with the projecting piece, so that the bent state of the outer flap can be maintained. In the box sheet, the end slit is curved, and the shortest distance between the boundary line and the end slit in the extending direction of the outer flap is 0.1 times or more and 0.9 times the sheet thickness. Therefore, in the bent state of the outer flap, the base end edge of the outer flap and the projecting piece can be pressed against each other. Therefore, the box sheet can appropriately maintain the bent state of the outer flap.

The longest distance between the boundary line and the end slit in the extending direction of the outer flap is preferably 0.5 times or more and 1.5 times or less the sheet thickness. As described above, when the longest distance between the boundary line and the end slit in the extending direction of the outer flap is within the above range, the base end edge of the outer flap is set in the bent state of the outer flap. Proper contact can be achieved by the projectiles. As a result, the bent state of the outer flap can be more reliably maintained.

The difference between the longest distance between the boundary line and the end slit in the extending direction of the outer flap and the shortest distance between the boundary line and the end slit is preferably 0.8 mm or more and 2.5 mm or less. As described above, the difference between the longest distance between the boundary line and the end slit in the extending direction of the outer flap and the shortest distance between the boundary line and the end slit is within the above range. In the bent state of the outer flap, the base end edge of the outer flap can be appropriately brought into contact with the projecting piece. As a result, the bent state of the outer flap can be more reliably maintained.

It is preferable that the end slit has an arc shape. As described above, since the end slit has an arc shape, the bent state of the outer flap can be easily and surely maintained.

It is preferable that the end slit is convex toward the first side panel side. As described above, since the end slit is convex toward the first side panel side, the bent state of the outer flap can be easily and surely maintained while facilitating the bending of the outer flap. Can be done.

In the present invention, the "vertical direction" means the vertical direction in a general usage mode assumed in a box body formed by assembling a box sheet. The "inside" means the "inside" in the box body formed by assembling the box sheet, and the "outside" means the "outside" in the above-mentioned box body. The “arc shape” is not limited to a perfect circular arc, but includes an elliptical or oval arc.

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

[Box sheet]
The box sheets 10 of FIGS. 1 and 2 can be assembled into a box body, specifically, the box body 20 of FIGS. 3 and 4. The box sheet 10 includes a pair of first side surface panels 1a and 1b and a pair of second side surface panels 2a and 2b facing each other in the assembled state. The pair of first side surface panels 1a and 1b and the pair of second side surface panels 2a and 2b are alternately connected in the left-right direction. Further, the box sheet 10 has a pair of outer lid flaps 3a and 3b extending from the upper edges (upper side edges) of the pair of first side surface panels 1a and 1b and bent inward, and a pair of second side surfaces. A pair of inner lid flaps 4a and 4b extending from the upper edges of the panels 2a and 2b and bent toward the inner surface side of the pair of outer lid flaps 3a and 3b, and a pair of lower edges (lower) of the first side panel 1a and 1b. A pair of bottom outer flaps 5a and 5b extending from the side edge) and bent inward, and a pair of second side panel 2a and 2b extending from the lower edge and bent inward toward the inner surface side of the pair of bottom outer flaps 5a and 5b. A pair of in-bottom flaps 6a and 6b are provided. Further, the box sheet 10 includes a joint 7 extending from the lateral edge of the first side surface panel 1a arranged on the outer side in the left-right direction (left side in FIG. 1). The "left-right direction" means the horizontal direction in a general usage mode assumed in a box body formed by assembling a box sheet. Further, in FIG. 1, a thick solid line indicates a cutting line formed by cutting a sheet, and a thin solid line indicates a ruled line formed by pressing one side of the sheet. The ruled lines arranged between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b define the boundary line between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b. The ruled lines arranged between the first side surface panels 1a and 1b and the outer bottom flaps 5a and 5b define the boundary line between the first side surface panels 1a and 1b and the outer bottom flaps 5a and 5b.

The box sheet 10 is composed of one sheet. The sheet used for the box sheet 10 is not particularly limited as long as it has enough strength to maintain the shape of the box body 20 formed by assembling the box sheet 10, and is not particularly limited, for example, a corrugated cardboard sheet, cardboard, or the like. Examples thereof include a paper sheet, a synthetic resin sheet, and a laminated sheet of a paper sheet and a synthetic resin sheet. Among them, a paper sheet is preferable, and a corrugated cardboard sheet is particularly preferable, from the viewpoints of workability, shock absorption, handleability, recyclability, economy and the like. The corrugated cardboard on which the box sheet 10 is formed is a corrugated cardboard in which a core formed in a wavy shape is attached to a liner. For example, a core formed in a wavy shape is attached to one liner. Single-sided corrugated cardboard sheet, double-sided corrugated cardboard sheet with a liner attached to the top of the single-sided corrugated cardboard, double-sided corrugated cardboard sheet with the top of the single-sided corrugated cardboard attached to one side of the double-sided corrugated cardboard, and one side of the double-sided corrugated cardboard sheet Examples thereof include a double-sided corrugated cardboard sheet in which the tops of the corrugated cardboard sheets are further bonded. Among these, double-sided corrugated cardboard sheets are preferable from the viewpoints of workability, economy, durability and the like.

The procedure for assembling the box sheet 10 into the box body 20 will be described. First, the first side panel 1a located on the outside in the left-right direction (left side in FIG. 1) is folded over the inner surface of the second side panel 2a connected to the first side panel 1a, and the outside in the left-right direction (right side in FIG. 1). The second side surface panel 2b located at is folded over the inner surface of the first side surface panel 1b connected to the second side surface panel 2b, and the glue margin 7 is attached to the inner surface of the folded second side surface panel 2b. Next, the pair of first side surface panels 1a and 1b and the pair of second side surface panels 2a and 2b connected in an endless manner are expanded into a square cylinder, and the pair of bottom flaps 6a and 6b are paired with a second side. Bend substantially perpendicular to the side panels 2a and 2b inward, and then bend the pair of bottom outer flaps 5a and 5b substantially vertically inward so as to fold over the pair of bottom inner flaps 6a and 6b. The bottom of the box 20 is assembled by abutting the edges against each other. Then, after arranging desired articles and the like in the pair of first side panel 1a and 1b and the pair of second side panels 2a and 2b assembled in a square tubular shape, the pair of flaps 4a and 4b in the lid are paired. Bend substantially perpendicular to the second side panel 2a and 2b of the above, and then substantially vertically inward so as to fold the pair of outer lid flaps 3a and 3b on the outer surface side of the pair of inner lid flaps 4a and 4b. The lid portion of the box body 20 is assembled by bending and abutting the tip edges against each other. In order to prevent the bottom and lid of the box body 20 from opening at the joint between the tip edges of the pair of outer bottom flaps 5a and 5b and the joint between the tip edges of the pair of outer lid flaps 3a and 3b. The sealing tape X may be attached.

(Side panel)
Each of the pair of first side panel 1a and 1b has a substantially rectangular shape. The pair of first side surface panels 1a and 1b have substantially the same shape. The size of the first side surface panels 1a and 1b can be set based on the size and quantity of the articles to be accommodated in the box body 20.

The pair of second side panel 2a and 2b are substantially rectangular, respectively. The pair of second side panel 2a and 2b have substantially the same shape. The length of the second side surface panels 2a and 2b in the left-right direction can be set based on the size and quantity of the articles to be housed in the box body 20. The vertical length of the second side surface panels 2a and 2b can be the same as the vertical length of the first side surface panels 1a and 1b.

(Flap outside the lid)
The pair of outer lid flaps 3a and 3b are substantially rectangular, respectively. The pair of outer lid flaps 3a and 3b have substantially the same shape. The widths of the outer lid flaps 3a and 3b are substantially equal to the lateral lengths of the first side surface panels 1a and 1b. The length of the outer lid flaps 3a and 3b in the extending direction can be about ½ of the length of the second side surface panels 2a and 2b in the left-right direction.

[Lock mechanism]
The box sheet 10 is provided with a locking mechanism for maintaining the bent state of the outer lid flaps 3a and 3b at the boundary portion between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b. Hereinafter, this locking mechanism will be described.

As shown in FIGS. 1 and 2, a plurality of projecting pieces 11 projecting toward the tip ends of the outer lid flaps 3a and 3b at the boundary portion between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b 11 Are provided at intervals. As shown in FIG. 2, the projecting piece 11 is a pair of side slits extending from the boundary line 12 between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b toward the tip end side of the outer lid flaps 3a and 3b. It is defined by a 13a and an end slit 13b connected to the tips of the pair of side slits 13a.

The plurality of projecting pieces 11 are arranged at substantially equal intervals at the boundary portion. The distance between adjacent projecting pieces 11 can be, for example, about 3 cm or more and 8 cm or less. The width of each projecting piece 11 can be, for example, about 3 cm or more and 8 cm or less.

The pair of side slits 13a are arranged in parallel. The pair of side slits 13a extend in a direction perpendicular to the boundary line 12 between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b.

The end slit 13b is curved. As a result, the end slit 13b is configured so that the distance to the boundary line 12 changes in the extending direction of the outer lid flaps 3a and 3b. As a result, as shown in FIGS. 3 and 4, the outer lid flaps 3a and 3b are bent substantially perpendicular to the first side surface panels 1a and 1b, and the outer lid flaps 3a are defined by the end slits 13b. The pressing force between the base end edge 14 of 3b and the projecting piece 11 can be partially increased in a portion where the distance between the boundary line 12 and the end slit 13b is short. Therefore, when the outer lid flaps 3a and 3b try to return to their original positions due to the reaction force of the sheet, the base end edge 14 and the projecting piece 11 strongly interfere with each other, and the outer lid flaps 3a and 3b are in a bent state. Return from is properly suppressed. Therefore, the bent state of the lid outer flaps 3a and 3b can be stably maintained.

_{The lower limit of the shortest distance L min} (see FIG. 2) between the boundary line 12 and the end slit 13b in the extending direction of the outer lid flaps 3a and 3b is 0.1 times the sheet thickness, which is 0.1 times the sheet thickness. 0.4 times is preferable. On the other hand, _{the upper limit of the shortest distance L min} is 0.9 times the sheet thickness, preferably 0.7 times the sheet thickness. If the shortest distance L _min does not reach the lower limit, the first side panel 1a and 1b are outside in a state of being assembled into the box body 20 by being pressed against the base end edges 14 of the outer lid flaps 3a and 3b. May easily swell. Further, if the shortest distance L _min is not less than the above lower limit, it becomes difficult to arrange the base end edge 14 of the outer lid flaps 3a and 3b on the inner surface side of the projecting piece 11 when the outer lid flaps 3a and 3b are bent. There is a risk. On the contrary, when the shortest distance L _min exceeds the upper limit, it may be difficult to sufficiently increase the pressing force between the base end edge 14 of the outer lid flaps 3a and 3b and the projecting piece 11.

_{The lower limit of the longest distance L max} (see FIG. 2) between the boundary line 12 and the end slit 13b in the extending direction of the outer lid flaps 3a and 3b is preferably 0.5 times the sheet thickness, and is preferably 0.5 times the sheet thickness. 0.8 times is more preferable, and 0.9 times the sheet thickness is further preferable. On the other hand, _{as the upper limit of the longest distance Lmax} , 1.5 times the sheet thickness is preferable, 1.2 times the sheet thickness is more preferable, and 1.1 times the sheet thickness is more preferable. If the longest distance L _max does not reach the lower limit, it may be difficult to arrange the base end edges 14 of the outer lid flaps 3a and 3b on the inner surface side of the projecting piece 11 when the outer lid flaps 3a and 3b are bent. be. On the contrary, when the longest distance L _max exceeds the upper limit, it may be difficult for the base end edges 14 of the outer lid flaps 3a and 3b to sufficiently interfere with the projecting piece 11.

The lower limit of the difference between the _{longest distance L max} between the boundary line 12 and the end slit 13b in the extending direction of the outer lid flaps 3a and 3b _{and the shortest distance L min between the boundary line 12 and the end slit 13b is 0.} 8 mm is preferable, and 1.0 mm is more preferable. On the other hand, the upper limit of the above difference is preferably 2.5 mm, more preferably 2.0 mm. If the above difference is not less than the above lower limit, it may be difficult to sufficiently increase the pressing force between the base end edges 14 of the outer lid flaps 3a and 3b and the projecting piece 11. On the contrary, when the above difference exceeds the above upper limit, when the outer lid flaps 3a and 3b are bent, the outer lid flaps 3a and 3b are arranged on the inner surface side of the projecting piece 11 while the base end edges 14 of the outer lid flaps 3a and 3b are arranged. It may be difficult to sufficiently interfere with the proximal edge 14 of 3a and 3b and the projecting piece 11.

The end slit 13b is preferably arcuate. Further, the arc is preferably a perfect circular arc. According to this configuration, the bent state of the lid outer flaps 3a and 3b can be easily and surely maintained.

When the end slit 13b has an arc shape, it is preferable that the end slit 13b is convex toward the first side surface panels 1a and 1b. When the end slit 13b is convex toward the first side surface panels 1a and 1b, the boundary line 12 and the end slit 13b in the extending direction of the outer lid flaps 3a and 3b are formed on both sides of the end slit 13b. The distance to and is maximized. As a result, when the outer lid flaps 3a and 3b are bent, the base end edges 14 of the outer lid flaps 3a and 3b can be easily arranged on the inner surface side of the projecting piece 11. Further, since the end slit 13b is convex toward the first side surface panels 1a and 1b, the pressing force between the base end edge 14 of the outer lid flaps 3a and 3b and the projecting piece 11 is sufficiently increased. The bent state of the lid outer flaps 3a and 3b can be reliably maintained.

(Flap in the lid)
The pair of in-cover flaps 4a and 4b are substantially rectangular, respectively. The pair of in-cover flaps 4a and 4b have substantially the same shape. The width of the flaps 4a and 4b in the lid is substantially equal to the length in the left-right direction of the second side panel 2a and 2b. The extension direction lengths of the inner lid flaps 4a and 4b can be the same as the extension direction lengths of the outer lid flaps 3a and 3b.

(Outside flap)
The pair of outer bottom flaps 5a and 5b are substantially rectangular, respectively. The pair of outer bottom flaps 5a and 5b have substantially the same shape. The bottom outer flaps 5a and 5b can have the same shape as the lid outer flaps 3a and 3b. At the boundary portion between the first side surface panels 1a and 1b and the bottom outer flaps 5a and 5b, a locking mechanism similar to that provided at the boundary portion between the first side surface panels 1a and 1b and the outer lid flaps 3a and 3b is provided. Is provided.

(Flap in the bottom)
The pair of in-bottom flaps 6a and 6b are substantially rectangular, respectively. The pair of in-bottom flaps 6a and 6b have substantially the same shape. The widths of the bottom flaps 6a and 6b are substantially equal to the left-right lengths of the second side panel 2a and 2b. The extension direction lengths of the bottom inner flaps 6a and 6b can be the same as the extension direction lengths of the bottom outer flaps 5a and 5b.

<Advantage>
The box sheet 10 has the first side surface panels 1a and 1b and the outer flaps at the boundary between the first side surface panels 1a and 1b and the outer flaps (the outer lid flaps 3a and 3b and the bottom outer flaps 5a and 5b). A projecting piece 11 defined by a pair of side slits 13a extending from the boundary line 12 toward the tip end side of the outer flap and an end slit 13b connected to the tip ends of the pair of side slits 13a is provided. When the outer flap is bent substantially perpendicular to the first side surface panels 1a and 1b, the base end edge 14 of the outer flap comes into contact with the projecting piece 11 to maintain the bent state of the outer flap. can. The box sheet 10 has a curved end slit 13b, and the shortest distance between the boundary line 12 and the end slit 13b in the extending direction of the outer flap is 0.1 times or more and 0.9 times the sheet thickness. Since it is as follows, the base end edge 14 of the outer flap and the projecting piece 11 can be pressed against each other in the bent state of the outer flap. Therefore, the box sheet 10 can appropriately maintain the bent state of the outer flap.

[Other Embodiments]
The above embodiment does not limit the configuration of the present invention. Therefore, in the above-described embodiment, the components of each part of the above-described embodiment can be omitted, replaced or added based on the description of the present specification and the common general technical knowledge, and all of them are construed to belong to the scope of the present invention. Should be.

In the above embodiment, a configuration in which a pair of first side panels and a pair of second side panels are alternately connected in the left-right direction has been described. However, the pair of first side panels and the pair of second side panels need not be necessarily connected alternately in the left-right direction as long as they are arranged so as to face each other in a state of being assembled in a box body. May be good.

In the above embodiment, the configuration in which the above-mentioned locking mechanism is provided at the boundary between the first side surface panel and the outer lid flap and the first side surface panel and the outer bottom flap has been described. However, the locking mechanism may be provided only at one of the boundary portion between the first side surface panel and the outer lid flap and the boundary portion between the first side surface panel and the outer bottom flap.

As long as the box sheet is provided with the lock mechanism at least one of the boundary portion between the first side surface panel and the outer lid flap and the boundary portion between the first side surface panel and the outer bottom flap. The specific configuration for forming the bottom portion and the lid portion of the box body is not particularly limited.

The specific shape of the end slit is not limited to the arc shape described above. For example, the end slit may be curved in a wavy shape from one end side to the other end side. Further, even when the end slit is arcuate, the end slit may be formed convexly toward the tip end side of the outer flap.

As described above, the box sheet according to one aspect of the present invention is suitable for appropriately maintaining the bent state of the flap in the state of being assembled in the box body.

1a, 1b 1st side panel 2a, 2b 2nd side panel 3a, 3b Outer lid flap 4a, 4b Inner lid flap 5a, 5b Bottom outer flap 6a, 6b Bottom inner flap 7 Slit 10 Box sheet 11 Projection piece 12 Boundary Line 13a Side slit 13b End slit 14 Base end edge 20 Box body X Sealing tape L _min The shortest distance between the boundary line and the end slit in the extension direction of the outer lid flap _{L max In the extension direction of the outer lid flap} The longest distance between the border and the end slit

Claims (5)

A box sheet that can be assembled into a box
A pair of first side panels and a pair of second side panels facing each other in the assembled state,
It is provided with a pair of outer flaps that extend from one side edge of the pair of first side panels in the vertical direction and are bent inward.
At the boundary between the first side panel and the outer flap, a plurality of protrusions protruding toward the tip end side of the outer flap are provided at intervals.
The projecting pieces are connected to a pair of side slits extending from the boundary line between the first side surface panel and the outer flap toward the tip side of the outer flap, and the tips of the pair of side slits. It is defined by an end slit and
The end slit is curved,
A box sheet in which the shortest distance between the boundary line and the end slit in the extending direction of the outer flap is 0.1 times or more and 0.9 times or less the sheet thickness. The box sheet according to claim 1, wherein the longest distance between the boundary line and the end slit in the extending direction of the outer flap is 0.5 times or more and 1.5 times or less the sheet thickness. Claim that the difference between the longest distance between the boundary line and the end slit in the extending direction of the outer flap and the shortest distance between the boundary line and the end slit is 0.8 mm or more and 2.5 mm or less. 1 or the box sheet according to claim 2. The box sheet according to claim 1, claim 2 or claim 3, wherein the end slit is arcuate. The box sheet according to claim 4, wherein the end slit is convex toward the first side panel side.

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