Blank sheets for transport packaging boxes and boxes before assembly

Abstract

To provide a blank sheet for a portable packing case capable of configuring a handle 20 to be lifted and a portable pre-box manufacturing box.SOLUTION: A blank sheet for a portable packing case of the invention comprises a cylinder body 6 assembled and formed with a plurality of peripheral wall plates and a side plate flap 8 blocking an opening 7 of the cylinder body 6. Two slits S, S extending from a first peripheral wall plate 2 constituting one of the plurality of peripheral wall plates 2-4 to a first flap 8 provided across a folding line at one side 2b of the first peripheral wall plate 2 are formed. The first flap 8 has an inserting part 16 and the inserting part 16 is inserted from an insertion part 26 formed on a base end side of other side plate flap 10 blocking the opening 7 with the first flap 8 or the insertion part formed on a flat plate surface of the other side plate flap and fixed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a blank sheet for a carrying packaging box and a box before being made into a box. [Background technology]

[0002] With the expansion of mail-order sales such as online shopping, a delivery format in which packaged products are delivered to a location convenient for the purchaser, such as a delivery locker installed in a public place such as a convenience store or a train station, and the purchaser then takes the product home or other location is becoming more common. Some delivery products are heavy, and considering the ease of carrying the product to the final destination, it is desirable for the packaging box to have a handle so that it can be carried with one hand. As such packaging boxes for carrying by hand, rectangular parallelepiped boxes have been developed that can be folded up to use as a handle when carrying the product by hand (for example, see Patent Document 1 below).

[0003] The packaging box described in Patent Document 1 has peripheral wall plates that form a rectangular tube and side flaps that close the opening of the rectangular tube. Furthermore, the packaging box has two slits formed in the peripheral wall plates, and a handle that can be pulled up between the slits. The two slits are formed along both longitudinal ends of the peripheral wall plates, and the side flaps are formed to a certain depth so that the center of the handle can be pulled up sufficiently. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3913789 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional packaging boxes such as those described above, when the box is held by the handle, a large load is applied to the side flaps that are continuous with the end of the handle, so the side flaps must be firmly glued together to prevent them from lifting up and opening. However, such packaging boxes have the problem of requiring adhesive during box manufacturing, which increases raw material costs and work processes. In addition, such packaging boxes are usually used using the so-called wrap-around method, in which the box is manufactured while wrapping the items to be contained, but this requires large box manufacturing equipment and is extremely costly, making it unsuitable for small lot products. Therefore, the present invention provides a blank sheet and a pre-made box for a carrying packaging box that can avoid or reduce the use of adhesive. [Means for solving the problem]

[0006] The blank sheet for the portable packaging box of the present invention comprises a cylindrical body formed by assembling a plurality of peripheral wall plates, and side panel flaps that close the opening of the cylindrical body, and two slits are formed extending from a first peripheral wall plate that constitutes one of the plurality of peripheral wall plates to a first flap provided on one side of the first peripheral wall plate via a fold line, and the first flap has an insertion portion that is inserted and fixed into an insertion portion formed on the base end edge of another side panel flap that closes the opening together with the first flap, or an insertion portion formed on the flat surface of the other side panel flap. According to this configuration, the insertion portion is firmly inserted into the insertion portion, so that the first flap is prevented from opening even when a load is applied to the handle.

[0007] The insertion portion of the blank sheet of the portable packaging box of the present invention may be provided on an edge that intersects with the one edge of the first flap, and may be inserted and fixed into an insertion portion formed on the base end edge of another side panel flap with which the intersecting edge overlaps when folded. According to this configuration, the insertion portion is inserted along the inner surface of the other peripheral wall plate, so that the first flap is prevented from opening even when a load is applied to the handle.

[0008] The first flap of the blank sheet of the portable packaging box of the present invention forms a lid member that covers the entire opening, and the insertion portion is provided on the tip edge of the first flap extending parallel to the one side, and may be inserted into and fixed to an insertion portion provided on the base end edge of another side panel flap with which the tip edge overlaps when folded. According to this configuration, the insertion portion is inserted around to the other peripheral wall plate opposite the first peripheral wall plate, so that the first flap is prevented from opening even when a load is applied to the handle.

[0009] A reinforcing member may be attached between the two slits in the blank sheet of the carrying packaging box of the present invention so as to extend beyond both ends of the two slits. This configuration increases the rigidity of the handle.

[0010] The reinforcing member of the blank sheet of the carry-on packaging box of the present invention may be a tape made of synthetic resin. This configuration increases the rigidity of the handle.

[0011] The side flaps other than the first flap that close the opening of the cylindrical body of the blank sheet of the carry-on packaging box of the present invention may be formed so as not to overlap each other when closing the opening. This configuration can prevent the side panel flaps that close the opening of the cylindrical body from overlapping and attempting to lift up, thereby opening the opening.

[0012] When the blank sheet for the portable packaging box of the present invention is assembled, a joining plate is formed by bonding it to the inner surface of the first peripheral wall plate, connecting the first peripheral wall plate to an adjacent peripheral wall plate. The joining plate has a base end surface portion that connects the first peripheral wall plate to the adjacent peripheral wall plate, and a tip surface portion that is continuous with the base end surface portion and covers the two slits from the inner surface of the first peripheral wall plate. The tip surface portion may have an engaging edge that is perpendicular to the two slits on the first flap side when the joining plate is placed on top of the first peripheral wall plate. This configuration prevents the handle from going too far into the packaging box when pulled up.

[0013] The joining plate of the blank sheet of the portable packaging box of the present invention may have a cover piece that can cover the portion of the two slits extending to the first flap when it is attached to the inner surface of the first peripheral wall plate. With this configuration, the cover piece can cover the gap that is created when the handle is lifted during box making.

[0014] The pre-formed portable box of the present invention is formed using any one of the blank sheets described above. This configuration provides any one of the above-described actions and functions. [Effects of the Invention]

[0015] The blank sheet and pre-made box for a portable packaging box of the present invention can avoid or reduce the use of adhesive, thereby achieving the effect of making manufacturing or box-making easier. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing an open packaging box according to an embodiment of the present invention. [Figure 2] FIG. 2 is a development view of a blank sheet according to an embodiment of the present invention. [Figure 3] 1 is a side view of a packaging box according to an embodiment of the present invention, viewed from the opening side. [Figure 4] FIG. 1 is a plan view showing a box before being made into a carton according to an embodiment of the present invention. [Figure 5] 1 is a perspective view showing a state in which a handle of a packaging box according to an embodiment of the present invention is pulled up. FIG. [Figure 6] FIG. 10 is a development view showing another example of a blank sheet according to an embodiment of the present invention. [Figure 7] FIG. 10 is a side view of another example of a packaging box according to an embodiment of the present invention, viewed from the opening side. [Figure 8] FIG. 10 is a development view showing another example of a blank sheet according to an embodiment of the present invention. [Figure 9] FIG. 10 is a side view of another example of a packaging box according to an embodiment of the present invention, viewed from the opening side. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, with reference to the drawings, various embodiments of the packaging box of the present invention will be described. Note that the dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions and can be changed as appropriate. In the present embodiments, each part is referred to as a side, etc., but these are intended to indicate the relative positional relationship of each part when each part is viewed in the direction shown in each drawing or when the packaging box is viewed with the handle surface facing up, and do not necessarily determine the orientation of the packaging box, etc.

[0018] As shown in Figure 1, a portable packaging box 1 according to one embodiment of the present invention comprises a cylindrical body 6 formed by assembling a plurality of peripheral wall panels 2, 3, 4, and 5, and first to fourth flaps (side panel flaps) 8 to 11 that close openings 7 at both ends of the cylindrical body 6.

[0019] FIG. 2 is a view of a blank sheet 1a forming the packaging box 1, viewed from the surface that faces the front (outside) side during box making. 2, the plurality of peripheral wall plates include a first peripheral wall plate 2, a second peripheral wall plate 3, a third peripheral wall plate 4, and a fourth peripheral wall plate 5. The first peripheral wall plate 2, the second peripheral wall plate 3, the third peripheral wall plate 4, and the fourth peripheral wall plate 5 are connected in this order in one direction via bending lines 6a extending between them.

[0020] The first peripheral wall plate 2 and the third peripheral wall plate 4 are formed in a rectangular shape with approximately the same dimensions. The second peripheral wall plate 3 and the fourth peripheral wall plate 5 are formed in a rectangular shape with approximately the same dimensions.

[0021] The fourth peripheral wall plate 5 is connected to a joining plate 15 which is folded and laid on the inner surface of the first peripheral wall plate 2 when the box is made.

[0022] Approximately rectangular first flaps 8 are connected to the side edges (base end edges) 2b, 2c of the first peripheral wall plate 2, respectively. The first flap 8 constitutes a lid member that covers the entire opening 7 of the cylindrical body 6 shown in FIG. An insertion portion 16 projects from a leading edge 8t of the first flap 8 that faces the side edge 2b that forms the boundary between the first flap 8 and the first peripheral wall plate 2.

[0023] The insertion portion 16 has a base end portion 16a extending almost perpendicularly from the tip edge 8t, and an approximately pentagonal or triangular entry portion 16b that extends on both sides of the width of the base end portion 16a and then smoothly tapers toward the tip. The tip edge 8t of the first flap 8 has very slightly recessed notches 17 on both sides of the insertion portion 16.

[0024] The first flap 8 has a tear-off opening 18 . The breaking opening 18 extends narrowing toward the side edge 2b from two locations sandwiching the notches 17, 17 on both sides of the insertion portion 16, and is surrounded by perforations 18a that surround the base end portion 16a of the insertion portion 16 and the notches 17, 17 in an approximately trapezoidal shape, making it breakable.

[0025] Slits 19a, 19a extend perpendicular to horizontal portion 18b from two distant points on perforation 18a near side edge 2b, i.e., from two points near both ends of horizontal portion 18b of perforation 18a in this embodiment. A folding line 19b is formed between the tips of slits 19a, 19a. The area surrounded by horizontal portion 18b of perforation 18a, slit 19a, and folding line 19b forms opening window 19, which serves as a trigger for removing tear opening 18.

[0026] A first flap 8 is connected to the side edge 2c of the first peripheral wall plate 2, and is similar to the side edge 2b except for the breakable opening 18 and the opening window 19. Two slits S are formed between the first flaps 8, 8, and extend through the first peripheral wall plate 2. A handle 20 is formed between the two slits S, S.

[0027] The two slits S, S extend parallel to each other on the first flap 8 on the side edge 2b side, and extend in directions slightly approaching each other on the side edge 2b. Because the two slits S, S extend in the direction approaching each other, they extend parallel to each other for a certain distance toward the side edge 2c with a width dimension that is smaller than the width at the first flap 8, and then extend in a gently curved shape that warps toward each other so that they are at their narrowest approximately in the center between the side edges 2b and 2c.

[0028] That is, the two slits S, S are configured to protrude in the width direction in the first flap 8 more than the shape in the first peripheral wall plate 2. In the first flap 8, the portion that protrudes more than the width dimension of the first peripheral wall plate 2 constitutes a protruding portion 25.

[0029] The two curved slits S, S in the first peripheral wall plate 2 extend parallel to each other again near the side edge 2c, extend slightly apart on the side edge 2c, and then extend parallel to each other at the first flap 8 provided on the side edge 2c with a width dimension larger than the width at the first peripheral wall plate 2. The tips of the slits S, S are formed in an arc shape that curves in a direction that warps toward each other in each of the first flaps 8, 8. As a result, the end between the slits S, S smoothly widens at the tip.

[0030] Each of the two slits S, S has several easily breakable connection points p. The connection points p do not necessarily have to be located on the slits S. An opening hole 21 is formed at approximately the center of the extension direction of the two slits S, S, i.e., on the outside of the narrowest part, which serves as a trigger when pulling up the handle 20 between the two slits S, S.

[0031] The handle 20 has one or more (four in this embodiment) bending lines 22 extending in a direction substantially perpendicular to the extension direction formed in the approximate center of the extension direction of the handle 20. These bending lines 22 make it easier for the handle 20 to bend in a substantially arc shape when pulled up between the two slits S, S. Between the tips of the two slits S, S formed in the first flap 8, a folding line 23 is formed.

[0032] The first flaps 8, 8 and the first peripheral wall plate 2 between them are formed substantially symmetrically when viewed approximately along the center line between the side edges 2b and 2c, except for the break opening 18 and the opening window 19. The break opening 18 and the opening window 19 may be formed in the first flaps 8, 8 on both the side edges 2b and 2c, but in this embodiment they are formed in only one of the first flaps 8.

[0033] The second peripheral wall plate 3 has side edges (base end edges) 3b, 3c to which second flaps 9, 9 having a generally trapezoidal shape and a shorter extension dimension than the first flap 8 are connected. The second flap 9 has a corner K of approximately 90° on the first flap 8 side of its leading edge 9t. An inclined edge 9a extends from the end of the leading edge 9t of the second flap 9 on the third flap 10 side toward the corner of the second peripheral wall plate 3. The leading edge 9t and inclined edge 9a of the second flap form a corner of approximately 135°.

[0034] The inclined edge 9a and the side edge 3b form a 45° angle. The extension dimension of the second flap 9 from the side edge 3b is set so as not to overlap with the protruding portion 25 formed on the first flap 8 during box making, as shown in Figure 3. As shown in FIG. 2, the second flap 9 provided on the side edge 3c of the second peripheral wall plate 3 is symmetrical with the second flap 9 provided on the side edge 3b.

[0035] A third flap 10 having a substantially trapezoidal shape and two inclined sides 10a, 10a is provided on the side sides 4b, 4c of the third peripheral wall plate 4. The inclined sides 10a form an angle of 45° with the side sides 4b, 4c. A notch 10k is formed in the approximate center of the leading edge 10t of the third flap 10 on the side 4b side to prevent overlap with the opening window 19 of the first flap 8 during box making.

[0036] Approximately in the center of the side edges 4b and 4c, an insertion portion 26 into which the insertion portion 16 is inserted is formed as a slit. The slit forming the insertion portion 26 has both end portions 26e formed substantially on the side edges 4b, 4c, and the inside of both end portions 26e is bent toward the third flap 10 by substantially the thickness of the blank sheet, and is formed parallel to the side edges 4b, 4c. The dimension between both end portions 26e, 26e is formed to be substantially the same width as the base end portion 16a of the insertion portion 16, and the entire slit including both end portions 26e, 26e is formed to have a dimension that allows the insertion of the entry portion 16b.

[0037] As a result, when the third flap 10 is folded at the side edge 4b ​​(4c), a very thin elongated hole 26h is formed into which the tip of the insertion portion 16b can be easily inserted, as shown in Fig. 3. Ends 26e on both sides of the elongated hole 26h are walls with only slits formed therein, and by pushing the insertion portion 16b with a stronger force, the entire insertion portion 16b can be inserted, and thereafter, both ends of the insertion portion 16b in the width direction are prevented from easily slipping out.

[0038] As shown in FIG. 2, the third flap 10 provided on the side edge 4c of the third peripheral wall plate 4 is symmetrical to the third flap 10 provided on the side edge 4b, except for the portion of the notch 10k.

[0039] Fourth flaps 11, 11 having a symmetrical shape to the second flaps 9, 9 are provided on the side edges 5b, 5c of the fourth peripheral wall plate 5.

[0040] A joining plate 15 is connected to the bending line 6a of the fourth peripheral wall plate 5, which is parallel to the bending line 6a where the third peripheral wall plate 4 is connected, to connect the first peripheral wall plate 2 and the fourth peripheral wall plate 5 to form the cylindrical body 6 shown in Figure 1. The joining plate 15 is formed with a width dimension smaller than the dimension between the side edges 2b, 2c of the first peripheral wall plate 2.

[0041] The joining plate 15 has a roughly trapezoidal base end surface portion 30 that gradually narrows toward an imaginary midpoint line L that extends parallel to the bending line 6a with a gap therebetween, and a roughly rectangular tip end surface portion 31 that is continuous with the base end surface portion 30 at the imaginary midpoint line L2.

[0042] The sides 30b and 30c of the base end surface portion 30 are gently inclined in the direction in which they approach each other. The side edges (locking edges) 31b, 31c of the tip end surface portion 31 extend parallel to the side edges 5b, 5c of the fourth peripheral wall plate 5 from the tip ends of the side edges 30b, 30c of the base end surface portion 30. A gap of about several mm is formed between the side edges 31b, 31c and the extension lines of the side edges 5b, 5c of the fourth peripheral wall plate 5.

[0043] In the above-described configuration, the joining plate 15 is provided so as to overlap the inner surface of the first peripheral wall plate 2. As shown in Figure 4, when the joining plate 15 is placed on the first peripheral wall plate 2, the tip surface portion 31 is positioned to cover almost the entire handle 20, with a gap of several millimeters between it and the protruding portion 25.

[0044] Next, a method for folding the blank sheet 1a into the pre-box 1b will be described. First, the third peripheral wall plate 4 and the fourth peripheral wall plate 5 are folded along the folding line 6a shown in FIG. 2 so that their inner surfaces overlap each other.

[0045] The folding line 6a between the first peripheral wall plate 2 and the second peripheral wall plate 3 is folded, and the inner surface of the first peripheral wall plate 2 is placed on a joining plate 15 to which adhesive is applied, avoiding the portions overlapping with the handle 20 and the opening hole 21. As a result of the above, a pre-box-making box 1b, which is folded flat before being made into a box, is completed as shown in FIG.

[0046] To make the box 1b into a three-dimensional packaging box 1, the folding line 6a, which is the folding point of the box 1b shown in FIG. 4, is folded or raised by 90 degrees to make it three-dimensional. Thereafter, the second to fourth flaps 9 to 11 on the sides 3c, 4c, and 5c are closed, and then the first flap 8 is closed and the inserting portion 16 is inserted into the inserting portion 26 formed along the side 4c of the third flap 10.

[0047] As a result of the above, the packaging box 1 is formed with the opening 7 open as shown in FIG. Thereafter, as shown in FIG. 3, the articles are appropriately placed through the opening 7 on the side edges 2b to 5b, and the first to fourth flaps 8 to 11 are closed.

[0048] When carrying the packaging box 1 by hand, the user places his / her fingers in the opening 21 and pulls up the handle 20. 5, the end of the handle 20 on the side of the first flaps 8, 8 is pulled inside the packaging box 1. At this time, the handle 20 and the protruding corner portion 25 are engaged with the side edges 31b, 31c of the joining plate 15, so that the handle 20 can be fixed with an appropriate degree of flexure.

[0049] When removing an item from the packaging box 1, the insertion portion 16 is pulled out of the insertion portion 26 to open the first flap 8. The insertion portion 26 is configured so that both ends of the insertion portion 16 can be locked by the wall portions at both ends of the narrow elongated hole 26h so that the insertion portion 16 does not easily come out. Therefore, if it is difficult to pull out the insertion portion 16, the first flap 8 can be easily opened by pressing the opening window 19 with a finger, hooking the finger on the tear opening 18, and tearing the tear opening 18 along the perforation.

[0050] As described above, the first to fourth flaps 8 to 11 are closed so that the second to fourth flaps 9 to 11 do not overlap one another. Therefore, when the first flap 8 is closed, the second to fourth flaps 9 to 11 are prevented from floating up, making it easier to close the opening.

[0051] Furthermore, the insertion portion 16 of the first flap 8 wraps around to the inner surface of the third peripheral wall plate 4 on the opposite side of the first peripheral wall plate 2 on which the handle 20 is formed, and is inserted along the inner surface of the third peripheral wall plate 4. Therefore, as shown in Fig. 5, even if the first flap 8 on which the end of the handle 20 is formed is pulled strongly by pulling up the handle 20, the first flap 8 can be prevented from opening.

[0052] Furthermore, the above-mentioned configuration closes the openings 7, 7 on both sides of the packaging box 1, which makes it possible to avoid using adhesive to close the packaging box 1, thereby reducing manufacturing costs and eliminating the need to seal the packaging box 1.

[0053] In addition, a joining plate 15 that covers the handle 20 is attached to the inner surface of the first surrounding wall plate 2, so when the handle 20 is pulled up, the opening made by the handle 20 is blocked from the inside, preventing dust from entering and preventing the contents from being seen from the outside.

[0054] Furthermore, since the side edges 31b, 31c of the joining plate 15 are formed to be positioned a few millimeters away from the side edges 2b, 2c of the first peripheral wall plate 2, when an attempt is made to pull up the handle 20, the protruding portions 25 at both ends of the handle 20 can be appropriately inserted into the inside of the packaging box 1 and engaged.

[0055] In the above embodiment, the most preferred embodiments of the blank sheet 1a, the pre-formed box 1b, and the packaging box 1 of the present invention are shown, but the aspects of the present invention are not limited to those described in the above embodiment.

[0056] For example, as shown by the imaginary lines in Figure 2, a reinforcing member 40 that reinforces the rigidity of the handle 20 may be attached to the front or back of the handle 20 so as to extend beyond both ends of the two slits. The reinforcing member 40 may be made of any material as long as it reinforces the handle 20, but tapes made of paper, nonwoven fabric, synthetic resin, or a combination of these are preferably used.

[0057] The insertion portion 16 may be provided on both side edges (intersecting edges) 8y that are perpendicular to the tip edge 8t of the first flap 8, or on both the tip edge 8t and the side edge 8y. In this case, the insertion portion 26 is formed on the side edges 3b, 5b, etc. of the second flap 9 and the fourth flap 11 that correspond to the insertion portion 16 when the first flap 8 is closed. Even with this configuration, when the handle 20 is pulled up and the packaging box 1 is held, the first flap 8 forming the end of the handle 20 can be prevented from opening.

[0058] Also, as shown in Figures 6 and 7, the insertion portion 16 formed on the edge of the first flap 8 may be configured to be inserted into and engaged with the insertion portion 36 formed on the flat surface of the third flap 10.

[0059] In this case, the first flap 8 and the third flap 10 extend from the side edges 2b, 2c and 4b, 4c in such a dimension that at least the ends including the tip edges 8t, 10t of the first flap 8 and the third flap 10 overlap each other. The insertion portion 16 is formed on the leading edge 8t of the first flap 8. The insert portion 16 is formed in the same manner as in the previous embodiment.

[0060] The insertion portion is formed at a position where the insertion portion 16 is inserted and the base end 16a reaches the insertion portion when the first flap 8 and the third flap are closed. The insertion portion 36 is formed by slits 36e, 36e at both ends and an elongated hole 36h between the ends 36e, 36e for facilitating insertion of the insertion portion 16.

[0061] Even with this configuration, as shown in Figure 7, when the insertion portion 16 is inserted into the insertion portion 36, the left and right protruding portions of the entry portion 16b of the insertion portion 16 can be firmly engaged within the slits 36e, 36e of the insertion portion 36, preventing the first flap 8 from opening.

[0062] It is preferable, but not essential, that the handle 20 have a protruding portion 25. It is also preferable, but not essential, that the joining plate 15 have a tip surface portion 31. The side flaps 9 and 10 may have any angle at their corners as long as they do not overlap each other. Furthermore, the blank sheet, pre-formed box, and packaging box of the present invention can also be applied to cases where the blank sheet, pre-formed box, and packaging box have a three-dimensional shape other than a rectangular parallelepiped.

[0063] Furthermore, as shown in Figures 8 and 9, the joining plate 15 may have cover pieces 50, 50 that, when attached to the inner surface of the first peripheral wall plate 2, can completely cover the portions of the two slits S, S that extend to the first flaps 8, 8, including the protruding portions 25.

[0064] The cover pieces 50, 50 are plate portions connected to the side edges (locking edges) 31b, 31c of the tip surface portion 31 of the joining plate 15, which extend parallel to each other. The shape of the cover pieces 50, 50 is not particularly limited as long as it is large enough to completely cover the protruding portion 25, but in this variation, it is approximately trapezoidal. The longer, trapezoidal bottom edge 50b of the cover pieces 50, 50 overlaps with the side edges 31b, 31c. The cover pieces 50, 50 are bendable at the side edges 31b, 31c. The bottom edge 50b is formed so as to cover as much of the protruding portion 25 as possible. By adopting this shape, the second flap 9, the fourth flap 11 and the first flap 8 can be overlapped to reliably close the corners of the opening without any gaps, and the gap that occurs when the handle 20 is pulled up can be covered from the inside with the cover piece 50.

[0065] The second flaps 9,9 and the fourth flaps 11,11 are formed in a shape that avoids the cover pieces 50,50 so as not to interfere with them when the box is made, and the third flaps 10,10 are also formed in a rectangular shape that covers down to the tip edge (i.e., the upper edge of the trapezoid) of the cover pieces 50,50 that are bent toward the inside of the opening when the box is made so as not to interfere with them.

[0066] As described above, by providing the cover pieces 50, 50 on the joining plate 15, the packaging box 1 and its blank sheet 1a in Figures 8 and 9 have the effect of covering from the inside the gap that occurs when the handle 20 is lifted and the protruding portion 25 moves inward, making it difficult for outside air or dust to enter the inside. Furthermore, the packaging box 1 and its blank sheet 1a in FIGS. 8 and 9 have the advantage that the cover pieces 50, 50 can make the inside almost completely invisible. [Explanation of symbols]

[0067] 1 packaging box 1a Blank sheet 1b Pre-folded box 2 1st peripheral wall plate 6 Cylinder 6a Folding line 2b,3b,4b,5b side 2c,3c,4c,5c side 7 Openings 8. First flap (side panel) 9 Second flap (other side panel flap) 10. Third flap (other side flap) 11 Fourth flap (other side flap) 16 Insertion part 20 Handle 25 overhang 26 Insertion section 50 cover piece S slit

Claims

1. The device comprises a cylindrical body formed by assembling a plurality of peripheral wall plates, and a side plate flap that closes an opening of the cylindrical body, two slits are formed extending from a first peripheral wall plate constituting one of the plurality of peripheral wall plates to a first flap provided on one side of the first peripheral wall plate; The first flap has an insert portion, the insertion portion is inserted into and fixed to an insertion portion formed on a base end edge of another side plate flap that closes the opening together with the first flap or an insertion portion formed on a flat surface of the other side plate flap, the insertion portion is provided on a side of the first flap that intersects with the one side, The blank sheet of the portable packaging box is inserted and fixed along the inner surface of the peripheral wall plate to which the other side plate flap is connected from an insertion part formed on the base end side of the other side plate flap with which the intersecting side overlaps when folded.

2. The device comprises a cylindrical body formed by assembling a plurality of peripheral wall plates, and a side plate flap that closes an opening of the cylindrical body, two slits are formed extending from a first peripheral wall plate constituting one of the plurality of peripheral wall plates to a first flap provided on one side of the first peripheral wall plate; The first flap has an insert portion, the insertion portion is inserted into and fixed to an insertion portion formed on a base end edge of another side plate flap that closes the opening together with the first flap or an insertion portion formed on a flat surface of the other side plate flap, A blank sheet for a portable packaging box, wherein the side flaps other than the first flap that closes the opening of the cylindrical body are formed so as not to overlap each other when the opening is closed.

3. The device comprises a cylindrical body formed by assembling a plurality of peripheral wall plates, and a side plate flap that closes an opening of the cylindrical body, two slits are formed extending from a first peripheral wall plate constituting one of the plurality of peripheral wall plates to a first flap provided on one side of the first peripheral wall plate; The first flap has an insert portion, the insertion portion is inserted into and fixed to an insertion portion formed on a base end edge of another side plate flap that closes the opening together with the first flap or an insertion portion formed on a flat surface of the other side plate flap, a joining plate is formed by bonding it to the inner surface of the first peripheral wall plate during box making, and the joining plate connects the first peripheral wall plate and the adjacent peripheral wall plate; the joining plate has a base end surface portion that connects the first peripheral wall plate and the peripheral wall plate adjacent to the first peripheral wall plate, and a tip end surface portion that is continuous with the base end surface portion and covers the two slits from the inner surface of the first peripheral wall plate, The tip surface portion is a blank sheet for a portable packaging box, and when the tip surface portion is placed on the first peripheral wall plate, the sheet has an engaging edge on the first flap side that is perpendicular to the two slits.

4. When the joining plate is attached to the inner surface of the first peripheral wall plate, the first of the two slits 4. A blank sheet for a packing box for carrying according to claim 3, further comprising a cover piece capable of covering the portion extending up to one flap.

5. A box before being made into a box, which is formed using the blank sheet according to any one of claims 1 to 4.

Images