JP2019202823A - Variable wall storage box - Google Patents

Abstract

To provide a storage box whose peripheral wall is hard to be torn even when contents exceeding internal dimensions are packed.SOLUTION: In the storage box in which side plates 3, 4 are adjacent to each other through a vertical ruled line 2 at a corner portion of a peripheral wall 1, flaps 6, 7 are connected to top ends of the side plates 3, 4, contents C such as spherical agricultural products are received from an opening on a top surface, and then the flaps 6, 7 are closed, a couple of auxiliary ruled lines 11, in which a gap between them increases from a lower side toward an upper side with the vertical ruled line 2 in between, are engraved at at least one of the corner portions where the side plates 3, 4 are adjacent to each other, thus, a triangular shaped portion 12 is formed between the vertical ruled line 2 and the auxiliary ruled line 11, and therefore, both a folding angle along the auxiliary ruled line 11 and a folding angle along the vertical ruled line 2 of the triangular shaped portion 12 at the corner portion of the peripheral wall 1 can be changed according to a size of the contents C.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a storage box whose shape of a peripheral wall changes according to the size of contents to be stored.

  As shown in FIG. 13, side plates 53 and 54 in the length direction and the width direction are arranged through vertical ruled lines 52 at the corners of the peripheral wall 51 as storage boxes made of cardboard for storing spherical agricultural products such as cabbage, lettuce and pumpkin. Short flaps 55 and 56 are provided adjacent to each other at the upper ends of the side plates 53 and 54. When the contents C are stored from the top opening and the flaps 55 and 56 are closed, the opening remains on the top. A short flap type is often used.

  Such a storage box can close the flaps 55 and 56 even if the contents C are packed so as to rise to some extent. However, if the packing is excessively packed, excessive tension acts on the corner portion of the peripheral wall 51, and the peripheral wall 51 becomes vertical. There is a risk of tearing from the upper end along the ruled line 52.

  Incidentally, in Patent Document 1 below, as shown in FIG. 14, as a storage box characterized by the corner portion of the peripheral wall 61, in the vicinity of the boundary between the side plates 63 and 64 adjacent to each other with the vertical ruled line 62 interposed therebetween, upward from the lower end. An auxiliary ruled line 65 having a taper-like interval is formed by engraving, thereby forming a triangular part 66 between the vertical ruled line 62 and the auxiliary ruled line 65, and at the upper end of the adjacent triangular part 66 at each corner part. The thing in which the corner edge piece 67 was provided in a row is described.

  In this storage box, when the corner edge piece 67 is bent inward from the upper end of the adjacent triangular portion 66, the bending along the vertical ruled line 62 of the corner portion of the peripheral wall 61 is completely extended, and the adjacent triangular portion 66 is formed. Form the same plane.

  When the octagonal cover plate 68 connected to the upper end of one side plate 63 in the lengthwise direction is closed, the insertion piece 69 connected continuously around the cover plate 68 is bent downward and inserted into the box. Since it has a unique and beautiful appearance with an octagonal top surface and a quadrilateral bottom surface, it can enhance the image of the contents when used as a storage box for fruits and cakes.

Japanese Utility Model Publication No. 60-54510

  However, in the storage box described in Patent Document 1 as well, since the shape of the peripheral wall 61 becomes fixed as the corner piece 67 is bent, the contents larger than the inner dimensions of the peripheral wall 61 will be packed. Then, the peripheral wall may be broken.

  Therefore, the present invention is intended to provide a storage box in which the peripheral wall is not easily torn even when the contents having a size exceeding the internal dimensions are packed.

In order to solve the above problems, the present invention is such that the side plates are adjacent to each other through the vertical ruled lines of the corner portions of the peripheral wall, the flaps are continuously provided at the upper ends of the side plates, the contents are stored from the opening on the top surface, In the storage box where the flap is closed,
At least one of the corner portions adjacent to the side plate is provided with an auxiliary ruled line having an interval extending from the lower side to the upper side with respect to the vertical ruled line, whereby a triangular part is formed between the vertical ruled line and the auxiliary ruled line Formed,
According to the size of the contents, the folding angle along the auxiliary ruled line and the folding angle along the vertical ruled line of the triangular part at the corner part of the peripheral wall are both changed.

  In addition, the auxiliary ruled lines are engraved in two at each corner part with the vertical ruled line interposed therebetween, and the triangular part is formed on both sides of the vertical ruled line, and the triangular shape adjacent to the corner part of the peripheral wall. Each part is bent along the auxiliary ruled line.

  In addition, when the flap connected to the side plate of the peripheral wall is closed, a short flap type in which an opening remains on the top surface without abutting each other is stored, and the contents are stored so as to rise to some extent. However, the flap is supposed to be closed.

  Further, the upper end of the triangular portion of the side plate is an open end edge where the extension portion is not continuously provided, and the triangular portion is bent freely with respect to the side end portion of the flap.

  Furthermore, it is assumed that a corner convex portion is formed at the upper end of the triangular portion so as to protrude upward from the auxiliary ruled line side to the vertical ruled line side to increase the compressive strength at the time of stacking. It was.

Alternatively, the upper end of the triangular portion of the side plate and the side end portion of the flap are connected via a corner fold connection portion, and the corner fold connection portion extends from the intersection with the auxiliary ruled line to the side edge of the flap. It is assumed that it is sandwiched between connecting ruled lines with wide intervals,
When the flap is closed in a state where the triangular portion is bent along the auxiliary ruled line so that the peripheral wall swells, the corner-folded connecting part is bent so as to protrude along the connecting ruled line,
Even if the flaps are sequentially folded in the circumferential direction and the last folded flap is placed on the first folded flap and the flap is locked, the flap can be locked easily and the contents will spill out. I tried not to.

Further, the auxiliary ruled line is curved in an arc shape from the side plate to the flap connected to the upper end of the side plate, and is engraved so as to reach the side edge of the flap. The flap also has a gap between the side edge and the auxiliary ruled line. It is assumed that a triangular part is formed on
Interlocking with the triangular part of the peripheral wall, the triangular part of the flap bends along the auxiliary ruled line, and even if there is a corner fold connecting part, the bent along the auxiliary ruled line of the triangular part of the peripheral wall It was made not to be disturbed.

  In the storage box according to the present invention, as the contents increase, the triangular portion at the corner portion of the peripheral wall bends along the auxiliary ruled line, and the bending angle gradually increases and the bend along the vertical ruled line extends. Even if the gap between the opposite sides of the top surface, which is the root of the flap, is expanded and the contents exceeding the internal dimensions of the peripheral wall are packed, the peripheral wall becomes difficult to break along the vertical ruled line, and the contents such as agricultural products can be removed. It can be securely enclosed and transported.

The reverse view which shows the blank of the surrounding wall variable storage box which concerns on 1st Embodiment of this invention The perspective view which shows the state before the flap closure of the top side at the time of an assembly same as the above The perspective view which shows a flap closed state where the top surface of the same is a quadrangle Schematic plan view showing a state where the top surface of the same is a dodecagonal flap. The top view same as the above is a perspective view showing a flap closed state with a dodecagon Schematic plan view showing a state where the top surface is the octagonal flap open (7A)-(7D) The elements on larger scale which show the other example of the auxiliary ruled line same as the above. The reverse view which shows the blank of the surrounding wall variable storage box which concerns on 2nd Embodiment of this invention The perspective view which shows the state before the flap closure of the top side at the time of an assembly same as the above The perspective view which shows the bending state of the triangular part along the auxiliary ruled line same as the above. The perspective view which shows the flap closed state of a top surface same as the above. The partial expansion perspective view which shows the overhanging state of the corner folding connection part same as the above A perspective view showing a conventional short flap type storage box The perspective view which shows the top octagonal storage box of patent document 1 in an open state

  First, a first embodiment of the present invention will be described with reference to FIGS.

  This peripheral wall variable storage box stores spherical agricultural products such as cabbage, lettuce, and pumpkin, and is formed of a cardboard blank as shown in FIG. In this blank, in a portion constituting the peripheral wall 1, a pair of side plates 3 in the length direction and side plates 4 in the width direction are alternately arranged via the vertical ruled lines 2 in the corner portion, and the side plate at one end portion of the blank A passage piece 5 is connected to the outer end of 3 via a vertical ruled line 2.

  Top side flaps 6 and 7 are connected to the upper ends of the side plates 3 and 4, respectively, and bottom side flaps 8 and 9 are connected to the lower ends of the side plates 3 and 4, respectively. The top-side flaps 6 and 7 are shorter than the bottom-side flaps 8 and 9 that close the bottom surface so that the opening remains on the top surface when closed in the assembled state.

  Further, a grip hole 10 a is provided near the upper part of the width direction intermediate part of the pair of side plates 4, and a vent hole 10 b is provided near the tip of the width direction intermediate part of the pair of flaps 8.

  In each corner portion where the side plates 3 and 4 are adjacent, auxiliary ruled lines 11 having a taper shape extending from the lower part to the upper part with the vertical ruled line 2 interposed therebetween are engraved. A triangular portion 12 is formed between the ruled lines 11.

  In addition, auxiliary ruled lines 11 are engraved on the end portion of the passage piece 5 and the side plate 3 facing this, and the end portion of the side plate 4 on the opposite side so as to be the same as other corner portions during assembly, A triangular portion 12 is formed.

  The auxiliary crease line 11 is a crease line that presses the corrugated cardboard from the back side, and the auxiliary crease line 11 of the passage piece 5 that overlaps the side plate 4 on the opposite side is a lead crease that is intermittently cut to reduce bending resistance. It is said that.

  The upper end of the triangular portion 12 is an open end edge where no extended portion is continuously provided, and the side edges of the top side flaps 6 and 7 are obliquely cut away from the triangular portion 12. One side edge of the flap 6 located in the middle of the blank is cut obliquely to the vicinity of the tip so as to facilitate locking described later.

  Further, the upper end of the triangular portion 12 protrudes upward from the auxiliary ruled line 11 side slightly lower than the ruled line at the base of the flaps 6 and 7 to the vertical ruled line 2 side which is the middle of the corner portion during assembly. A raised corner projection 13 is formed.

  Such a blank is folded along two vertical ruled lines 2 at the boundary between each pair of side plates 3 and 4 in the manufacturing process, and the passage piece 5 is attached to the inner surface of the side end portion of the opposite side plate 4. Together, it is in a flat folded state.

  When assembling and using the peripheral wall variable storage box as described above, as shown in FIG. 2, each corner portion of the peripheral wall 1 is bent at right angles along the vertical ruled line 2, and the pair of side plates 3 and 4 are respectively connected. Face each other so that the peripheral wall 1 has a rectangular tube shape, the bottom flap 9 is folded inward, and the flaps 8 are folded so as to overlap with each other, and the flaps 8 and 9 are fixed in a closed state with tape or the like. . Then, spherical agricultural products such as cabbage are stored in the box from the top opening.

  Then, as shown in FIG. 3, the pair of flaps 6, 7 on the top side are sequentially folded in the circumferential direction from one flap 6, and the flap that is folded at the end facing the side edge of the first folded flap 6 is finally folded. When riding on 7, the flaps 6, 7 can be locked in a closed state without using a sealing material such as tape.

  At this time, when the stored contents C are not large with respect to the inner dimensions of the peripheral wall 1, the peripheral wall 1 is maintained in a rectangular tube shape in which each corner portion is bent by 90 ° along the vertical ruled line 2. Is a quadrangle.

  On the other hand, as shown in FIGS. 4 and 5, when contents C that are slightly larger than the inner dimensions of the peripheral wall 1 are packed, the auxiliary ruled lines 11 are formed at the corners of the peripheral wall 1 so that the top surface becomes a dodecagon. The bends along the vertical ruled lines 2 are slightly extended, and the intervals between the opposing sides of the top surfaces that are the roots of the flaps 6 and 7 are slightly increased.

  Further, as shown in FIG. 6, when the contents C larger than the inner dimension of the peripheral wall 1 are packed, the auxiliary ruled line 11 of the triangular portion 12 of the peripheral wall 1 is formed so that the top surface is octagonal. Along the bending angle along, the folding along the vertical ruled line 2 is completely extended, and the distance between the opposing sides of the top surfaces that are the roots of the flaps 6 and 7 is further increased.

  As described above, in the above-described peripheral wall variable storage box, as the contents C increase, the triangular portion 12 of the peripheral wall 1 bends along the auxiliary ruled line 11, and the bending angle gradually increases, along the vertical ruled line 2. Since the folding is extended, the distance between the opposing sides of the top surfaces of the bases of the flaps 6 and 7 is increased, the peripheral wall 1 is inflated, and the contents C having a size exceeding the internal dimension of the peripheral wall 1 are packed. However, the peripheral wall 1 is difficult to break along the vertical ruled line 2.

  For this reason, the said surrounding wall variable storage box can set the internal dimension one size small compared with the general storage box which has comparable volume, and can suppress the cost which a material requires.

  In addition, since the bottom surface is a quadrangular shape, even semi-automatic box making machines owned by many farmers can be assembled in the same way as ordinary storage boxes. There is no need to do.

  In addition, in a state where the top surface is a dodecagon or octagon, when a plurality of storage boxes are stacked, at least a compressive strength equal to or higher than that of a normal storage box without the auxiliary ruled line 11 is secured.

  Further, since the corner convex portion 13 is formed at the upper end of the triangular portion 12, the accumulated load is received by the corner convex portion 13 which is not easily buckled against the vertical load, the compressive strength is increased, and the contents C are crushed. And cargo collapse is prevented.

  In the above embodiment, the vertical ruled line 2 and the two auxiliary ruled lines 11 sandwiching the vertical ruled line 2 intersect each other at the base angle that is the lower end of the vertical ruled line 2 at each corner. It does not have to intersect, and it does not have to reach the base angle. Further, the auxiliary ruled line 11 may not reach the upper ends of the side plates 3 and 4.

  For example, as shown in FIG. 7 (7A), the vertical ruled line 2 and the two auxiliary ruled lines 11 sandwiching the vertical ruled line 2 or its extension line may intersect above the bottom corner, as shown in FIG. 7 (7B). As such, they may intersect below the base angle. Further, as shown in FIG. 7 (7C), the two auxiliary ruled lines 11 sandwiching the vertical ruled line 2 or their extended lines may cross the vertical ruled line 2 or its extended line at a position shifted vertically. Good. Further, the auxiliary ruled line 11 may be engraved only on one side of the vertical ruled line 2 at the corner as shown in FIG. 7 (7D).

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  Similarly to the first embodiment, the peripheral wall variable storage box stores spherical agricultural products such as cabbage, lettuce, and pumpkin, and is formed of a cardboard blank as shown in FIG. In this blank, in a portion constituting the peripheral wall 1, a pair of side plates 3 in the length direction and side plates 4 in the width direction are alternately arranged via the vertical ruled lines 2 in the corner portion, and the side plate at one end portion of the blank A passage piece 5 is connected to the outer end of 3 via a vertical ruled line 2.

  Top side flaps 6 and 7 are connected to the upper ends of the side plates 3 and 4, respectively, and bottom side flaps 8 and 9 are connected to the lower ends of the side plates 3 and 4, respectively. The top-side flaps 6 and 7 are shorter than the bottom-side flaps 8 and 9 that close the bottom surface so that the opening remains on the top surface when closed in the assembled state. One side edge of the flap 6 located in the middle of the blank is cut obliquely to the vicinity of the tip so as to facilitate locking described later.

  Note that the passage piece 5 extends upward and downward from the upper end and the lower end of the peripheral wall 1 in order to adhere to the upper and lower flaps 7 and 9 on the opposite side during assembly to enhance shape retention.

  Further, a grip hole 10 a is provided near the upper part of the width direction intermediate part of the pair of side plates 4, and a vent hole 10 b is provided near the tip of the width direction intermediate part of the pair of flaps 8.

  In each corner portion where the side plates 3 and 4 are adjacent, auxiliary ruled lines 11 that are curved in an arc shape from the lower part to the upper part with the vertical ruled line 2 interposed therebetween are widened. A triangular portion 12 is formed between the auxiliary ruled line 11. The auxiliary ruled line 11 is a ruled line formed by pressing the cardboard from the back surface.

  Further, the auxiliary ruled line 11 curved in an arc shape is also formed on the end portion of the passage piece 5 and the side plate 3 facing this and the end portion of the side plate 4 on the opposite side so as to be the same as other corner portions at the time of assembly. A triangular portion 12 is formed by engraving.

  Further, the flaps 6 and 7 are also engraved with arc-shaped auxiliary ruled lines 11 so as to reach the side edges continuously from the auxiliary ruled lines 11 of the side plates 3 and 4, and the side edges of the flaps 6 and 7 and the auxiliary ruled lines. A triangular portion 12 is formed between 11. The auxiliary ruled line 11 intersects the ruled line at the boundary between the side plates 3 and 4 and the flaps 6 and 7 at a right angle.

  The upper ends of the triangular portions 12 of the side plates 3 and 4 and the side ends of the flaps 6 and 7 are connected via a corner fold connection portion 14, and the corner fold connection portion 14 is connected to the flap 6 from the intersection with the auxiliary ruled line 11. 7 is sandwiched between connecting ruled lines 14a and 14b whose width increases toward the side edge. Further, a corner fold connection portion 14 is also formed in the upward extension portion of the passage piece 5.

  The connecting ruled line 14a is an extension of the ruled line at the boundary between the side plates 3 and 4 and the flaps 6 and 7, and the connecting ruled line 14b is corrugated so as to incline upward toward the side edges of the flaps 6 and 7. It is a ruled line engraved by pressing from the back. The corner fold connection portion 14 is subjected to a squeezing process for squeezing the cardboard in the thickness direction.

  Such a blank is folded along two vertical ruled lines 2 at the boundary between each pair of side plates 3 and 4 in the manufacturing process, and the passage piece 5 is attached to the inner surface of the side end portion of the opposite side plate 4. The upper and lower extensions of the passage piece 5 are bonded to the opposite flaps 7 and 9, respectively, so that the flat folded state is obtained.

  When assembling and using the above-described peripheral wall variable storage box, as shown in FIG. 9, the corner portions of the peripheral wall 1 are bent at right angles along the vertical ruled lines 2, and the pair of side plates 3 and 4 are respectively connected. Face each other so that the peripheral wall 1 has a rectangular tube shape, the bottom flap 9 is folded inward, and the flaps 8 are folded so as to overlap with each other, and the flaps 8 and 9 are fixed in a closed state with tape or the like. . Then, spherical agricultural products such as cabbage are stored in the box from the top opening.

  At this time, as shown in FIG. 10, when the large contents C are packed with respect to the inner dimension of the peripheral wall 1, the triangular portion 12 is bent along the auxiliary ruled line 11 at the corner portion of the peripheral wall 1, and the vertical ruled line 2 is formed. As the folding along the extension extends, the distance between the opposing sides of the top surface that becomes the root of the flaps 6 and 7 is increased, and the flaps are interlocked with the triangular portion 12 of the peripheral wall 1 via the corner fold connecting portion 14. The triangular portion 12 facing the side edges of 6 and 7 is also bent along the auxiliary ruled line 11.

  With such an action, as the contents C increase, the triangular portion 12 of the peripheral wall 1 bends along the auxiliary ruled line 11, the bending angle gradually increases, and the bend along the vertical ruled line 2 extends. Therefore, even if the space | interval of the opposing side of the top | upper surface used as the root of the flaps 6 and 7 is expanded, the surrounding wall 1 will be in the state which swelled and the content C of the magnitude | size exceeding the internal dimension of the surrounding wall 1 is packed, the surrounding wall 1 Becomes difficult to tear along the vertical ruled line 2.

  Then, as shown in FIG. 11, the pair of flaps 6, 7 on the top side are sequentially folded in the circumferential direction from one flap 6, and the flap that is folded last is the portion facing the side edge of the flap 6 that is folded first. When riding on 7, the flaps 6, 7 can be locked in a closed state without using a sealing material such as tape.

  When the flaps 6 and 7 are closed as described above, as shown in FIG. 12, the connecting ruled line 14 a becomes a mountain fold protruding from the front side of the cardboard, and the connecting ruled line 14 b becomes a valley fold recessed on the back side of the cardboard, Since the corner fold connection portion 14 is bent so as to protrude along the connection portion ruled lines 14a and 14b and the shape of the peripheral wall 1 is stabilized, the flaps 6 and 7 are not easily unlocked.

  By the way, in the process of transporting agricultural products such as cabbage using a short flap type storage box, it is possible to prevent cold air from directly touching agricultural products exposed from the opening on the top surface in a state of being loaded in a truck cooler. In order to prevent the agricultural products from being damaged, the storage boxes are sometimes turned upside down and stacked.

  Even in the state where the top and bottom are inverted in this manner, the storage box can prevent the flaps 6 and 7 from being unlocked, so that spillage of the agricultural products can be prevented and the agricultural products can be transported to the destination without being damaged.

  Further, the peripheral wall variable storage box, like the first embodiment, is set to a slightly smaller internal dimension than the general storage box having the same volume, and the cost required for the material is reduced. Even a semi-automatic box making machine owned by many farmers can be assembled in the same way as a general storage box, so there is no need for a farmer to use a new box making machine.

  In each of the embodiments described above, the auxiliary ruled line 11 may be a general ruled line, a lead ruled with a cut intermittently in the ruled line, or a perforation with only a cut intermittently, It is good also as a thing by the crushing which crushed the corrugated cardboard in the thickness direction with the width.

  In addition, the auxiliary ruled line 11 is engraved in all four corner portions and the triangular portion 12 is illustrated, but if at least one corner portion is configured in this way, the size of the contents is increased. Accordingly, since the top surface side of the peripheral wall 1 follows to some extent, the peripheral wall 1 is less likely to be broken along the vertical ruled line 2 than a general storage box.

  In addition, although the bottom surface is exemplified for a normal type conforming to the 0201 format of JIS Z 1507, the bottom surface format is a so-called one-touch in which adjacent flaps on the bottom surface are bonded together and a crease line in a diagonal direction is engraved from the diagonal. It may be a bottom or a so-called hell bottom by engagement of flaps, and is not particularly limited.

1 Perimeter wall 2 Vertical ruled line 3, 4 Side plate 5 Passage piece 6, 7 Flap (top side)
8,9 flap (bottom side)
10a Handle hole 10b Vent hole 11 Auxiliary ruled line 12 Triangular part 13 Corner convex part 14 Corner folding connecting part 14a, 14b Connecting part ruled line C Contents

Claims (7)

Side plates (3, 4) are adjacent to each other via vertical ruled lines (2) at the corners of the peripheral wall (1), and flaps (6, 7) are connected to the upper ends of the side plates (3, 4). In the storage box in which the contents are stored from the opening and the flaps (6, 7) are closed,
At least one corner portion adjacent to the side plates (3, 4) is provided with an auxiliary ruled line (11) that is widened from the bottom to the upper side with respect to the vertical ruled line (2). A triangular portion (12) is formed between the ruled line (2) and the auxiliary ruled line (11),
Depending on the size of the contents, the folding angle along the auxiliary ruled line (11) of the triangular part (12) at the corner part of the peripheral wall (1) and the bent along the vertical ruled line (2) A circumferential wall variable storage box characterized in that the angle changes together.   Two auxiliary ruled lines (11) are provided at each corner with the vertical ruled line (2) in between, and the triangular part (12) is formed on both sides of the vertical ruled line (2). The peripheral wall variable storage box according to claim 1, wherein:   Short flap type in which the flaps (6, 7) connected to the side plates (3, 4) of the peripheral wall (1) are in a closed state, and the openings remain on the top surface without being abutted against each other. The peripheral wall variable storage box according to claim 1 or 2, wherein   The peripheral wall variable storage according to any one of claims 1 to 3, wherein an upper end of the triangular portion (12) of the side plate (3,4) is an open end edge not provided with an extended portion. box.   At the upper end of the triangular part (12), a corner convex part (13) is formed so as to protrude upward from the auxiliary ruled line (11) side to the vertical ruled line (2) side. The peripheral wall variable storage box according to claim 4. The upper end of the triangular portion (12) of the side plate (3,4) and the side end of the flap (6, 7) are connected via a corner fold connection portion (14), and the corner fold connection portion (14). Is sandwiched between the connecting ruled lines (14a, 14b) where the gap extends from the intersection with the auxiliary ruled line (11) to the side edge of the flap (6, 7),
When the flap (6, 7) is closed in a state where the triangular portion (12) is bent along the auxiliary ruled line (11) so that the peripheral wall (1) swells, the corner fold connection portion (14 The peripheral wall variable storage box according to any one of claims 1 to 3, wherein the storage wall is bent so as to project along the connecting ruled lines (14a, 14b).   The auxiliary ruled line (11) is curved in an arc shape from the side plate (3,4) to the flap (6, 7) connected to the upper end thereof, and is engraved so as to reach the side edge of the flap (6, 7). The peripheral wall variable storage according to claim 6, wherein the flap (6, 7) also has a triangular portion (12) formed between a side edge thereof and the auxiliary ruled line (11). box.

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