JP3207310U - Box sheet - Google Patents

Abstract

The present invention provides a box sheet capable of reusing a used transport box as a storage box having relatively high strength. A box sheet is formed of a single corrugated cardboard sheet and has a rectangular tube shape having a pair of side panels 1 and 2 and a pair of end face panels 3 and 4 facing each other in a box-like assembled state. A pair of outer flaps 7 and 8 extending from the upper edge of the side panel, a first inner flap 9 extending from one upper edge of the end panel, and the other upper edge of the end panel And a second lid flap 10 that extends. A pair of lid flaps has an easy-to-cut line 15 extending from the base edge to the tip edge, and can be divided into a connection portion 16 on the first lid flap side and a folded portion 17 on the second lid flap side The first lid flap has an easy-to-bend line 18 parallel to the base end edge, and the outer portion 10 is superimposed on the outside of the connecting portion in the assembled state and the inner portion 20 is overlapped on the inner side of the connecting portion. It is divided. [Selection] Figure 1

Description

  The present invention relates to a box sheet.

  Boxes formed from corrugated cardboard sheets are used for various purposes. In particular, a cardboard box is generally used as a transport box for transporting various products from a factory to a store.

  It is contemplated that most of such product transport cardboard boxes are discarded or recycled with a one-time use. In practice, however, the used cardboard boxes for transporting products are often used as containers for storing other items or as shelves or boxes for organizing items (hereinafter referred to as storage boxes).

  General cardboard boxes are configured so that they can be sealed with four flaps. However, when used as a storage box, the flaps are likely to get in the way, so be sure to use them folded on the inner or outer surface of the side panel. There are many.

  In addition, in a gift box sealed by a single cover plate extending from one side panel, a sleeve that extends from the tip of the cover plate and the outer edge of the cover plate and is arranged outside the side panel during sealing It has also been proposed to make the lid plate easier to be reused as a storage box by excising the shape portion so that the lid plate can be easily folded inside the side panel (see JP-A-2006-36280).

  However, in the state where the cover plate or flap of the cardboard box is folded on the side panel, the opening of the box body is easily deformed so as to have a parallelogram shape, and the strength of the cardboard box is thus reduced. There is an inconvenience that they cannot be stacked.

See JP-A-2006-36280

  In view of the above inconveniences, an object of the present invention is to provide a box sheet that can be used as a storage box having a relatively high strength.

  The invention made in order to solve the above-mentioned problem is a box sheet formed from a single cardboard sheet and assembled in a box shape, and a pair of side panels and a pair of end faces that face each other in the assembled state. A square cylindrical portion having a panel, a pair of lid flaps extending from the upper edge of the side panel, a first lid flap extending from one upper edge of the end panel, and the end panel A second lid flap extending from the other upper edge, and the pair of lid outer flaps has an easy-to-cut line from the base edge to the tip edge, so that the first lid side flap connection And a folded portion on the second lid flap side, and the first lid flap has an easy-to-bend line parallel to the base end edge, so that the outer side of the connection portion in the assembled state. The outer part to be stacked and the inner part of the connection part A box seat, characterized in that it is divided into an inner portion to be.

  In the box sheet, the pair of outer lid flaps have an easy-to-cut line extending from the base edge to the distal edge, so that the first lid inner flap side connection portion and the second lid inner flap side folding back By holding the connecting portion in a butted state, the strength of the assembled storage box is ensured, and the folded portion is folded back so as to be in close contact with the inner surface of the side panel. An opening can be secured. In addition, the box sheet includes an outer portion that is overlapped on the outside of the connection portion in an assembled state and an inner side of the connection portion because the first lid flap has an easy-to-bend line parallel to the base end edge. By being divided into the inner portions to be overlapped, the connection portion can be sandwiched and held, and the strength of the storage box can be improved more reliably. For this reason, the said sheet | seat for boxes can reuse a used transport box as a storage box with comparatively big intensity | strength.

  The width in the left-right direction in the vicinity of the base edge of the inner part is preferably smaller than the width in the left-right direction of the end face panel, and the width in the left-right direction in the vicinity of the tip edge of the inner part is greater than or equal to the width in the left-right direction of the end face panel. . As described above, the width in the left-right direction in the vicinity of the base edge of the inner portion is smaller than the width in the left-right direction of the end surface panel, and the width in the left-right direction in the vicinity of the tip edge of the inner portion is greater than the width in the left-right direction of the end surface panel. Therefore, a state in which the vicinity of the tip of both side edges of the inner side portion is fitted between a pair of side panels, and the connection portion is sandwiched between the outer side portion and the inner side portion by a frictional force. It can be easily held.

  The end of the easy-to-cut line on the side panel side may be inclined toward the first lid flap side. Thus, the end of the easy-to-cut line on the side panel side is inclined toward the first lid flap side, so that the connection part is sandwiched between the outer part and the inner part, The end portion of the easy-to-cut line can be arranged closer to the proximal end side of the first lid flap than the folding easy line of the first lid flap. This makes it difficult for stress to concentrate on the end of the easy-to-cut line, so that the strength of the storage box in which the box sheet is assembled can be improved.

  The extension length of the second lid flap is equal to or less than the extension length of the pair of lid flaps, and the shape of the second lid flap is an inverted trapezoidal shape that widens toward the tip edge. Good. Thus, the extension length of the second lid flap is equal to or less than the extension length of the pair of lid flaps, and the shape of the second lid flap is widened toward the tip edge. Due to the shape, the second lid flap is fitted between the pair of folded portions folded back so as to be in close contact with the inner surfaces of the pair of side panels, and the folded portion is brought into close contact with the inner surfaces of the side panels by friction force. While being held in the state, the second lid flap can be held in a state of being in close contact with the inner surface of the end face panel.

  The corners at both ends of the inner edge may be rounded and chamfered. Thus, the corners at both ends of the leading edge of the inner part are rounded and chamfered, so that when the box sheet is assembled to form a storage box, the inner part is bent and the liner of the cardboard sheet is peeled off. This can be suppressed.

  The box sheet of the present invention can reuse a used transport box as a storage box having relatively high strength.

It is a typical top view (development drawing) which shows the sheet for boxes of one embodiment of the present invention. It is a perspective view of the transport box which assembles the sheet | seat for boxes of FIG. It is a perspective view of the storage box which assembles the sheet | seat for boxes of FIG. It is a perspective view which shows the procedure which transforms the transport box which assembles the sheet | seat for boxes of FIG. 1 into a storage box. It is a perspective view which shows the procedure following FIG. 4 which transforms the transport box which assembles the sheet | seat for boxes of FIG. 1 into a storage box.

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

[Box sheet]
A box sheet according to an embodiment of the present invention shown in FIG. 1 is formed from a single cardboard sheet and assembled into a box shape. In FIG. 1, a thick solid line indicates a cutting line formed by cutting a corrugated cardboard sheet, and a portion that looks like a broken line is formed by arranging short cutting lines. In FIG. 1, a thin solid line indicates a ruled line that is easily pushed on the surface of the cardboard sheet to facilitate the folding of the cardboard sheet.

  The corrugated cardboard sheet for forming the box sheet is not only a sheet in which both sides of one core are sandwiched between a pair of liners, but also a so-called double flute in which each core is sandwiched between three liners. You may use, and you may use what is called a single-sided cardboard with which the liner was stuck only on the one side of the center core.

  As shown in FIG. 2, the box sheet can be assembled into a transport box for storing and transporting articles, and after opening the transport box, as shown in FIG. It can be used for storage, and the articles can be reassembled into a storage box that can be easily put in and out.

  The box sheet includes a pair of side panels (first side panel 1 and second side panel 2) that face each other in an assembled state, and a pair of end panels (first end panel 3 and second end panel 4). The rectangular cylindrical part 5 which has is provided. More specifically, the box sheet includes a first side panel 1, a first end panel 3, a second side panel 2, and a second end panel 4 connected in this order in the left-right direction. A joint 6 is connected to the side edge opposite to the end panel 3, and the joint 6 is attached to the back side of the end of the second end panel 4 opposite to the second side panel 2. A square cylindrical portion 5 formed in a loop shape is provided.

  In this specification, “left” and “right” and “upper” and “lower” are used for convenience to indicate the positional relationship of each component, and the box sheet is Although it corresponds to the horizontal direction and the vertical direction in the general arrangement of the transport box to be assembled, the direction at the time of use of the transport box or storage box in which the box sheet is assembled is not limited.

  Further, the extending direction of the ridgeline of the core of the corrugated cardboard sheet in the box sheet is not particularly limited, but the vertical compressive strength of the transport box in which the box sheet is assembled, that is, the stacking resistance of the transport box The vertical direction is preferable in that it can be improved.

  The first side panel 1 and the second side panel are formed in a substantially equal square shape. The 1st end surface panel 3 and the 2nd end surface panel 4 are substantially equal mutually, and are formed in the square shape whose height of the up-down direction is substantially equal to the 1st side surface panel 1 and the 2nd side surface panel 2. FIG. The left and right widths of the first end panel 3 and the second end panel 4 are preferably smaller than the left and right widths of the first side panel 1 and the second side panel 2.

  For example, an adhesive or a stapler can be used as a method of forming the rectangular tubular portion 5, that is, a method of attaching the joint 6 to the second end surface panel 4.

  The box sheet includes a pair of rectangular outer lid flaps (first outer lid flap 7 and second outer lid flap 8) extending from the upper edges of the side panels 1 and 2, and one of the end panels. A first in-lid flap 9 extending from the upper edge of the (first end face panel 3) and a second in-lid flap 10 extending from the upper edge of the other end face panel (second end face panel 4) are provided.

  Further, the box sheet includes a pair of rectangular bottom outer flaps (first bottom outer flap 11 and second bottom outer flap 12) extending from the lower edges of the side panels 1, 2, and end panel 3, 4 is provided with a pair of rectangular inner bottom flaps (first bottom inner flap 13 and second bottom inner flap 14) extending from the lower edge of the four.

  The box sheet is assembled in a box shape by sealing with bottom inner flaps 13 and 14 and bottom outer flaps 11 and 12. Specifically, the first bottom inner flap 13 and the second bottom inner flap 14 are bent at the lower end opening of the rectangular tubular portion 5, and then the first bottom outer flap 11 and the second bottom outer flap 12 are connected to each other at the tip. The bottom part which seals the lower end opening of the square cylindrical part 5 is formed by bending so that it may face, and, thereby, the said box sheet | seat becomes a transport box which the upper part opened. The transport box thus assembled can maintain the assembled state by, for example, a method of sticking an adhesive tape along the joint between the first bottom outer flap 11 and the second bottom outer flap 12. .

  Further, the transport box in which the box sheet is assembled is sealed by sealing the upper opening by the flaps 7 and 8 outside the lid and the flaps 9 and 10 inside the lid. Specifically, the first lid flap 9 and the second lid flap 10 are bent at the upper end opening of the rectangular tubular portion 5, and then the first lid outer flap 7 and the second lid outer flap 8 are connected to each other at the tip. By bending so as to abut each other, a lid portion for sealing the upper end opening of the rectangular tubular portion 5 can be formed, and the shipping box in which the box sheet is assembled can be sealed. Furthermore, by sticking an adhesive tape along the joint between the first outer lid flap 7 and the second outer flap 8, the sealed state of the shipping box in which the box sheet is assembled can be maintained. .

  The transport box in which the box sheet is assembled is opened by peeling or cutting the adhesive tape attached to the joint between the first outer lid flap 7 and the second outer flap 8. The transport box in which the box sheet is assembled can be reassembled into the storage box shown in FIG. 3 after the box is opened and the articles stored therein are taken out.

  The storage box formed by assembling the box sheet is a transport box formed by the outer bottom flaps 11 and 12 and the inner bottom flaps 13 and 14 with the first end face panel 3 as the bottom face and the second end face panel 4 as the top face. The bottom of the box is the back, and the top of the front is an open box.

<Flap outside the lid>
The outer flaps 7 and 8 have a vertical extension length of the left and right ends of the end panels 3 and 4 in order to seal the upper end opening of the rectangular tubular portion 5 in the transport box in which the box sheets are assembled. It is approximately ½ of the direction.

  Further, the flaps 7 and 8 outside the lid are easy-to-cut lines 15 extending from the base edge (boundary with the side panels 1 and 2) to the front edge so that the box sheet can be assembled into the storage box of FIG. Have Thereby, the flaps 7 and 8 outside a lid | cover can be divided | segmented into the connection part 16 by the side of the 1st in-lid flap 9, and the folding | turning part 17 by the side of the 2nd flap in a lid, respectively. The easy-to-cut lines 15 of the pair of outer lid flaps 7, 8, and thus the connecting portion 16 and the folded portion 17 are formed symmetrically in the unfolded state of the box sheet.

  Preferably, the base end edges of the pair of outer lid flaps 7 and 8 are defined by double ruled lines (two ruled lines formed side by side at a narrow interval to promote one folding). Thus, by defining the base end edges of the outer lid flaps 7 and 8 by double formation, it is relatively easy to fold the folded portion 17 along the inner surfaces of the side panels 1 and 2.

  The lower limit of the average spacing of the double ruled lines that define the base edges of the outer lid flaps 7 and 8 is preferably 1 times the average thickness of the corrugated cardboard sheet, and more preferably 1.5 times. On the other hand, the upper limit of the average interval of the double ruled lines that define the base edges of the outer lid flaps 7, 8 is preferably 2.5 times the average thickness of the corrugated cardboard sheet, and more preferably 2 times. When the average interval of the double ruled lines that define the base edges of the outer lid flaps 7 and 8 is less than the lower limit, it may not be easy to fold the folded portion 17 along the inner surfaces of the side panels 1 and 2. . Conversely, when the average spacing of the double ruled lines that define the base end edges of the outer lid flaps 7 and 8 exceeds the above upper limit, the folding position at the base end edges of the outer lid flaps 7 and 8 can be accurately determined. Therefore, there is a possibility that the gap between the transport boxes in which the box sheets are assembled becomes large.

(Easy cutting line)
The easy-to-cut line 15 can be defined by cuts (so-called perforations) that are intermittently formed in the cardboard sheet.

  As shown in the figure, the easy-to-cut line 15 may be formed such that the end on the side panel 1, 2 side is inclined toward the first lid flap 9 side, and the remaining tip side portion extends in the vertical direction. preferable. As described above, the end of the easy-to-cut line 15 on the side panel 1, 2 side is inclined toward the first lid flap 9 side, so that the easy-to-cut line 15 in the storage box in which the box sheet is assembled is formed. It is possible to suppress breakage of the corrugated cardboard sheet due to stress concentration on the side panel 1, 2 side end.

  As the lower limit of the average distance between the side edge of the outer lid flaps 7 and 8 on the first inner flap 9 side and the tip side portion of the easy-to-cut line 15 (the width in the horizontal direction of the connecting portion 16), the side panels 1 and 2 Is preferably 1/6, and more preferably 1/4. On the other hand, the upper limit of the average distance between the side edge of the outer lid flaps 7 and 8 on the first inner flap 9 side and the tip side portion of the easy-to-cut line 15 is 3 of the length in the left-right direction of the side panels 1 and 2. / 5 is preferable, and 1/2 is more preferable. Typically, the average distance between the side edge of the outer lid flaps 7 and 8 on the first inner flap 9 side and the tip side portion of the easy-to-cut line 15 is substantially equal to the extension length of the outer lid flaps 7 and 8. . When the average distance between the side edge on the first lid flap 9 side of the outer lid flaps 7 and 8 and the front end side portion of the easy-to-cut line 15 is less than the lower limit, the strength of the storage box in which the box sheet is assembled May not be improved sufficiently. Conversely, when the average distance between the side edge of the outer lid flaps 7 and 8 on the first inner flap 9 side and the tip side portion of the easy-to-cut line 15 exceeds the upper limit, the storage box in which the box sheet is assembled. There is a possibility that the opening and closing of the article becomes small, making it difficult to take in and out the article.

  As a minimum of the length of the up-and-down direction of the inclined part of easy-to-cut line 15, 10 mm is preferred and 15 mm is more preferred. On the other hand, the upper limit of the vertical length of the inclined portion of the easy-to-cut line 15 is preferably 50 mm, and more preferably 30 mm. If the length in the vertical direction of the inclined portion of the easy-to-cut line 15 is less than the lower limit, stress concentration on the end of the easy-to-cut line 15 may not be sufficiently suppressed. Conversely, when the length of the inclined portion of the easy-to-cut line 15 exceeds the upper limit, there is a possibility that deformation of the storage box in which the box sheet is assembled cannot be sufficiently suppressed.

  The lower limit of the inclination angle of the inclined portion of the easy-to-cut line 15 with respect to the tip side portion of the easy-to-cut line 15 is preferably 30 °, and more preferably 40 °. On the other hand, the upper limit of the inclination angle of the inclined portion of the easy-to-cut line 15 with respect to the tip side portion of the easy-to-cut line 15 is preferably 60 °, and more preferably 50 °. If the inclination angle of the inclined portion of the easy-to-cut line 15 with respect to the tip side portion of the easy-to-cut line 15 is less than the lower limit, stress concentration on the end of the easy-to-cut line 15 may not be sufficiently suppressed. On the contrary, when the inclination angle of the inclined portion of the easy-to-cut line 15 with respect to the tip side portion of the easy-to-cut line 15 exceeds the above upper limit, there is a possibility that the deformation of the storage box in which the box sheet is assembled cannot be sufficiently suppressed.

  The outer lid flaps 7 and 8 are preferably formed with notches 21 so as to chamfer the corners on the front end side of the easy-to-cut line 15 of the connecting portion 16 and the folded-back portion 17. By forming such a notch 21 in the flaps 7 and 8 outside the lid, it becomes easy to start breaking the easy cutting line 15, and in the storage box in which the box sheet is assembled, the easy cutting line of the folded portion 17 is formed. It is possible to prevent the corner on the tip side of 15 from being crushed and the liner of the cardboard sheet from being turned up from this corner.

<Flap in the first lid>
The first lid flap 9 has an easy-to-bend line 18 that crosses the base end edge in parallel. Accordingly, the first lid flap 9 is divided into an outer portion 19 that is overlapped on the outside of the connection portion 16 and an inner portion 20 that is overlapped on the inside of the connection portion in a state where the box sheet is assembled in the storage box. Is done. In other words, the first lid flap 9 is folded in half by the folding easy line 18 so as to sandwich the pair of connection portions 16, thereby the pair of side panels 1, 2 are paired with the pair of end panels 3, 4. Hold perpendicular to.

  The folding easy line 18 of the first lid flap 9 is preferably defined by a double ruled line. In this way, by defining the folding easy line 18 of the first lid flap 9 by double formation, the connecting portion 16 can be easily inserted between the outer portion 19 and the inner portion 20.

  As a minimum of the average space | interval of the foldable line 18, 1 time of the average thickness of a corrugated cardboard sheet | seat is preferable, and 1.5 times is more preferable. On the other hand, the upper limit of the average distance between the foldable lines 18 is preferably 3 times the average thickness of the corrugated cardboard sheet, and more preferably 2 times. When the average interval between the foldable lines 18 is less than the lower limit, a sufficient space for sandwiching the connecting portion 16 between the outer portion 19 and the inner portion 20 cannot be formed, and the thickness of the inner portion 20 depends on the thickness of the connecting portion 16. There is a possibility that the folded state is uncertain. On the other hand, when the average interval between the fold easy lines 18 exceeds the above upper limit, the connecting portion 16 rattles between the outer side portion 19 and the inner side portion 20 and the storage box in which the box sheet is assembled easily deforms. There is a fear.

(Outside part)
The outer side portion 19 is disposed on the outermost surface of the front wall portion existing on the lower side of the front surface in the storage box in which the box sheet is assembled.

  The outer portion 19 is formed in a rectangular shape whose lateral width is substantially equal to the lateral width of the first end face panel 3. Preferably, the width of the outer portion 19 in the left-right direction is smaller than the width of the first end face panel 3 in the left-right direction by the same amount as the average thickness of the corrugated cardboard sheet. The length is equal to or greater than the maximum width in the left-right direction of the connecting portion 16 of the outer lid flaps 7 and 8, preferably slightly longer. Moreover, it is preferable that the vertical extension length of the outer portion 19 is substantially equal to the vertical extension length of the outer lid flaps 7 and 8.

(Inner side)
The outer portion 19 is disposed on the innermost inner surface of the front wall portion existing on the lower side of the front surface of the storage box in which the box sheet is assembled, and is fitted between the opposing side panels 1 and 2 to cause friction. Held by force.

  The inner portion 20 has a width in the left-right direction in the vicinity of the base edge smaller than a width in the left-right direction of the first end face panel 3, and a width in the left-right direction in the vicinity of the front end edge is equal to or larger than the width in the left-right direction of the first end face panel 3. Preferably there is. Moreover, as a concrete shape of the inner side part 20, it is preferable that it is an inverted trapezoid shape widened toward a front-end edge.

  The extension length of the inner part 20 in the vertical direction is smaller than the extension length of the outer part 19. The lower limit of the difference in extension length between the inner portion 20 and the outer portion 19 is preferably 1.5 times the average thickness of the corrugated cardboard sheet, and more preferably 2 times. On the other hand, the lower limit of the difference in extension length between the inner portion 20 and the outer portion 19 is preferably 5 times the average thickness of the corrugated cardboard sheet, and more preferably 3 times. When the difference in the extension length between the inner part 20 and the outer part 19 is less than the lower limit, the tip of the inner part 20 interferes with the first bottom flap 13 and the inner part 20 is in close contact with the inner surface of the connection part 16. There is a risk that it will not be allowed. On the contrary, when the difference of the extension length of the inner side part 20 and the outer side part 19 exceeds the said upper limit, an unnecessary recessed part is formed inside the storage box which assembles the box sheet, and the article is easily caught. There is a risk.

  The lower limit of the difference between the length of the base end edge of the inner portion 20 (upper side of the foldable line 18) and the width in the left-right direction of the first end face panel 3 is preferably twice the average thickness of the corrugated cardboard sheet. More preferred. On the other hand, the upper limit of the difference between the length of the base edge of the inner portion 20 and the width in the left-right direction of the first end face panel 3 is preferably 6 times the average thickness of the corrugated cardboard sheet, and more preferably 5 times. When the difference between the length of the base end edge of the inner portion 20 and the width in the left-right direction of the first end face panel 3 is less than the lower limit, the inner portion 20 is connected to the connecting portion 16 when the box sheet is assembled into the storage box. It may not be easy to fold along the inner surface. On the contrary, when the difference between the length of the base end edge of the inner portion 20 and the width in the left-right direction of the first end face panel 3 exceeds the upper limit, an unnecessary concave portion is formed inside the storage box in which the box sheet is assembled. May form and the article may be easily caught.

  The lower limit of the difference between the maximum lateral width of the inner portion 20 and the lateral width of the first end face panel 3 is preferably 0, and more preferably 1/3 of the average thickness of the corrugated cardboard sheet. On the other hand, the upper limit of the difference between the maximum width in the left-right direction of the inner portion 20 and the width in the left-right direction of the first end face panel 3 is preferably 1.5 times the average thickness of the corrugated cardboard sheet and more preferably 1 time. When the difference between the maximum width in the left-right direction of the inner part 20 and the width in the left-right direction of the first end face panel 3 is less than the lower limit, the frictional force between the side panels 1 and 2 of the inner part 20 becomes insufficient. There is a possibility that the state where the box sheet is assembled in the storage box cannot be maintained. Conversely, if the difference between the maximum width in the left-right direction of the inner portion 20 and the width in the left-right direction of the first end face panel 3 exceeds the upper limit, it may not be easy to assemble the box sheet into a storage box, When the inner portion 20 is bent at the time of assembly, the frictional force between the side panels 1 and 2 becomes insufficient, and the state where the box sheet is assembled in the storage box may not be maintained.

  Furthermore, it is preferable that the shape of the inner portion 20 is chamfered with rounded corners at both ends of the tip edge. As described above, when the corners at both ends of the leading edge of the inner portion 20 are rounded and chamfered, the inner sheet 20 is fitted between the opposing side panels 1 and 2 and the box sheet is assembled into the storage box. In addition, it is possible to prevent the inner portion 20 from being bent or the liner of the corrugated cardboard sheet from being peeled off to reduce the frictional force that maintains the assembled state.

  The lower limit of the radius of curvature for chamfering the corners at both ends of the inner edge 20 is preferably 5 mm, and more preferably 10 mm. On the other hand, the upper limit of the radius of curvature of the corner chamfering at both ends of the inner edge 20 is preferably 30 mm, and more preferably 20 mm. If the radius of curvature of the chamfered corners at both ends of the inner edge 20 is less than the lower limit, there is a possibility that bending or the like when the inner wall 20 is fitted between the opposing side panels 1 and 2 cannot be sufficiently prevented. is there. On the contrary, when the curvature radius of the chamfering of the corners at both ends of the inner edge 20 exceeds the upper limit, the position where the frictional force is generated between the inner portion 20 and the side panels 1 and 2 is close to the foldable line 18. This may prevent the box sheet from being held in an assembled state.

<Flap in the second lid>
The second lid flap 10 is disposed between the pair of folded portions 17 in the storage box in which the box sheet is assembled, and the folded portions 17 are arranged along the inner surfaces of the side panels 1 and 2. And the second lid flap 10 itself is held along the inner surface of the second end face panel 4 by the frictional force with the folded portion 17.

  The shape of the second lid flap 10 is preferably an inverted trapezoidal shape that widens toward the leading edge so that the frictional force with the folded portion 17 is generated as far as possible on the distal end side in the extending direction. It is preferable that the corners on both sides of the tip edge are rounded and chamfered so that the second lid flap 10 is difficult to bend when being fitted.

  The extension length of the second lid flap 10 is the extension length of the lid flaps 7 and 8 so that it can be fitted between the pair of folded portions 17 in the storage box in which the box sheet is assembled. Or less. Further, in the transport box in which the box sheet is assembled, the extension length of the first lid flap 9 and the first length of the first lid flap 9 and the tip end portion of the second lid flap 9 are not buffered. It is preferable that the sum of the extension length of the flaps 10 in the two lids is equal to or less than the length of the side panels 1 and 2 in the left-right direction.

  The maximum lateral width of the second lid flap 10 is smaller than the lateral width of the second end face panel 4. The lower limit of the difference between the maximum width in the left-right direction of the second lid flap 10 and the width in the left-right direction of the second end face panel 4 is preferably 1 times the average thickness of the cardboard sheet, and more preferably 2 times. On the other hand, the upper limit of the difference between the maximum width in the left-right direction of the second lid flap 10 and the width in the left-right direction of the second end face panel 4 is preferably four times the average thickness of the corrugated cardboard sheet, and 3.5 times More preferred. If the difference between the maximum width in the left-right direction of the second lid flap 10 and the width in the left-right direction of the second end face panel 4 is less than the lower limit, the second lid flap 10 is placed between the pair of folded portions 17. When the fitting is performed, the second in-lid flap 10 is bent and the frictional force is reduced, so that the assembled state may not be maintained. On the contrary, when the difference between the maximum width in the left-right direction of the second lid flap 10 and the width in the left-right direction of the second end face panel 4 exceeds the above upper limit, the frictional force with the folded portion 17 becomes insufficient. There is a risk that the assembled state cannot be maintained.

  The base end edge of the second lid flap 10 (boundary with the second end face panel 4) is preferably defined by a double ruled line. As described above, the base end edge of the second lid flap 10 is defined by the double ruled line, so that the restoring force of the corrugated cardboard sheet can be reduced and the folded state of the second lid flap 10 can be easily maintained. In addition, the strength of the storage box in which the box sheet is assembled can be improved by increasing the rigidity of the upper edge of the second end face panel 4 by folding the second lid lid flap 10.

<Transformation from transport box to storage box>
A procedure for deforming the storage box after opening the transport box in which the box sheet is assembled, that is, a procedure for reassembling the transport box in which the box sheet is assembled into the storage box will be described.

  The transport box formed by assembling the box sheet is opened by opening the upper end opening of the rectangular tubular portion 5 by causing the flaps 7 and 8 outside the lid and the flaps 9 and 10 inside the lid.

  The opened box is connected by cutting the outer lid flaps 7 and 8 along the easy-to-cut line 15 while keeping the bottom formed by the outer bottom flaps 11 and 12 and the inner bottom flaps 13 and 14. By separating the part 16 and the folded part 17, it can be assembled as a storage box.

  As shown in FIG. 4, the storage box is first assembled by folding each folded portion 17 inward so that the folded portions 17 are brought into close contact with the inner surfaces of the side panels 1, 2, and then the second inner flap 10 is further attached to the second end panel 4. The second inner flap 10 is fitted between the upper ends of the pair of folded portions 17 by folding inward so as to be in close contact with the inner surface. By the friction between the folded portion 17 and the second inner flap 10, the pair of folded portions 17 and the second inner flap 10 are held in a state of being disposed along the inner surface of the rectangular tubular portion 5.

  Subsequently, as shown in FIG. 5, the pair of connection portions 16 are bent so that the ends of the connection portions abut each other. Then, the first inner flap 9 is folded so that the outer surface portion 19 is in close contact with the outer surface of the pair of connection portions 16, and the first inner flap 9 is bent so that the inner surface portion 20 is in close contact with the inner surfaces of the pair of connection portions 16. The storage box shown in FIG. In this state, the inner surface portion 20 fits between the pair of side panels 1 and 2 and is held by frictional force, so that the assembled state of the storage box is maintained.

<Advantages>
The box sheet is configured such that the pair of outer flaps 7 and 8 can be divided into the connecting portion 16 and the folded portion 17 by the easy-to-cut line 15, so that the folded portion 17 is formed on the inner surfaces of the side panels 1 and 2. By folding along, a storage box having an opening can be formed. In addition, the box sheet can hold the side panels 1 and 2 perpendicularly to the end panels 3 and 4 with the pair of connecting portions 16 sandwiched between the first lid flap 9 having the folding easy line 18. Increases the strength of the storage box. Therefore, the box sheet can be reused as a storage box having a relatively high strength after being used as a transport box.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

  In the box sheet, the length in the left-right direction of the pair of side panels may be smaller than the length in the left-right direction of the pair of end surface panels.

  Further, in the box sheet, the rectangular tubular portion may be provided with a joint between any of the side panels and the end panel. That is, in the unfolded box sheet, the order of the pair of outer lid flaps, the first inner flap, and the second inner flap is not limited to the order of the embodiment.

  Moreover, the structure which seals the bottom part opening of a square cylindrical part in the said sheet | seat for boxes is not restricted to the structure of embodiment, For example, arbitrary structures, such as a one-touch type and an American lock type, are employable.

  The transport box in which the box sheet is assembled is not limited to the one intended only for transport, and may have a function as a decorative box.

  The box sheet can be particularly suitably used as a transport box for transporting industrially produced products to a store.

DESCRIPTION OF SYMBOLS 1 1st side surface panel 2 2nd side surface panel 3 1st end surface panel 4 2nd end surface panel 5 Square cylindrical part 6 Joint 7 First lid outer flap 8 Second lid outer flap 9 First lid inner flap 10 Second lid Inner flap 11 First bottom outer flap 12 Second bottom outer flap 13 First bottom inner flap 14 Second bottom inner flap 15 Easy-to-cut line 16 Connection part 17 Folding part 18 Easy-to-bend line 19 Outer part 20 Inner part 21 Notch

Claims (5)

A sheet for a box formed from one cardboard sheet and assembled into a box shape,
A square tubular portion having a pair of side panels and a pair of end panels facing each other in an assembled state;
A pair of outer lid flaps extending from the upper edge of the side panel;
A first in-lid flap extending from one upper edge of the end face panel;
A second lid flap extending from the other upper edge of the end face panel,
The pair of lid outer flaps can be divided into a first lid inner flap side connecting portion and a second lid inner flap side folded portion by having an easy-to-cut line from the base edge to the tip edge. Yes,
The first lid flap has an easy-to-bend line parallel to the base edge, so that the first lid flap is divided into an outer part that is superimposed on the outside of the connection part in an assembled state and an inner part that is superimposed on the inner side of the connection part. A sheet for boxes characterized by that.   The width in the left-right direction in the vicinity of the base edge of the inner portion is smaller than the width in the left-right direction of the end surface panel, and the width in the left-right direction in the vicinity of the front end edge of the inner portion is equal to or greater than the width in the left-right direction of the end surface panel. The sheet | seat for boxes of 1.   The box sheet according to claim 1 or 2, wherein an end of the easy-to-cut line on the side panel side is inclined toward the first lid flap side.   The extension length of the second lid flap is equal to or less than the extension length of the pair of lid flaps, and the shape of the second lid flap is an inverted trapezoidal shape that widens toward the tip edge. The sheet | seat for boxes of Claim 1, Claim 2, or Claim 3.   The box sheet according to any one of claims 1 to 4, wherein corners at both ends of the inner edge are rounded and chamfered.

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