Packaging box and paperboard for forming packaging box

Abstract

To provide a packaging box having a thin rectangular parallelepiped shape, particularly a packaging box capable of being dropped into a mailbox, which can be easily manufactured by a box-making machine, and a paperboard for forming the packaging box. [Solution] The packaging box has a thin rectangular shape formed from a single sheet of paperboard 6, and the paperboard comprises a side wall surface portion 25 consisting of a front portion 23, a back portion 21, a left side portion 22, and a right side portion 24 connected in a row, a lid surface portion 31 connected to the back portion, and a flap surface portion 41 with the left side side portion and right side portion adjacent to the back portion and connected to each of the left side side portion and right side portion. One end of the side wall surface portion is provided with a quarter-circular glue surface portion 7 which connects to the other end to form a circular side wall portion, and the glue surface portion has a part that forms an arc of the outer edge located on the side facing the bottom wall portion of the packaging box, and the vicinity of the connection part of the arc part of the outer edge to the side wall surface portion is formed as a straight line of 3 mm or more extending in the row direction of the side wall surface portion, and is provided with a connecting portion that connects the opposing edges of the lid surface portion and the flap surface portion 41 in a point-like manner.

Description

[Technical field]

[0001] The present invention relates to a thin packaging box that can be dropped into a mailbox, and to a paperboard for forming the packaging box, particularly a paperboard applicable to a box-making machine. [Background technology]

[0002] With the spread of mail-order sales via television and online shopping on the Internet, there are more and more opportunities to have purchased products delivered to your home. Products to be delivered may be packed in packaging boxes made of cardboard or corrugated cardboard. In recent years, the sender often bears the shipping costs, and as the volume of deliveries increases, the shipping costs also increase, so senders want to keep the shipping costs per box as low as possible.

[0003] Relatively small and light packages can be stored in thin packaging boxes less than 3 cm thick and sent as mail, which reduces transportation costs. They can also be dropped into mailboxes, making the shipping process simple and convenient while keeping shipping costs low.

[0004] Such a thin packaging box is disclosed in Patent Documents 1 and 2 below. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3235359 [Patent Document 2] JP 2023-122724 A Summary of the Invention [Problem to be solved by the invention]

[0006] Paper packaging boxes are generally manufactured from a single sheet of paperboard using a box-making machine. During manufacturing, thin packaging boxes are not thick, but have a certain vertical or horizontal width, so they are prone to twisting in the vertical direction, and the glue tabs may shift from the intended position, making it difficult to manufacture them properly using a box-making machine. Therefore, in the manufacture of thin packaging boxes, they are sometimes produced manually, which is not a very efficient method of production.

[0007] Therefore, an object of the present invention is to provide a packaging box having a thin rectangular parallelepiped shape, particularly a packaging box that can be dropped into a mailbox, that is easy to manufacture, for example by using a box-making machine, and a paperboard for forming the packaging box. [Means for solving the problem]

[0008] The packaging box according to one embodiment of the present invention is a thin rectangular box made of a single sheet of cardboard, the cardboard comprising a side wall portion having a front portion, a back portion, a left side portion, and a right side portion which are connected in a row, a lid portion connected to the back portion, and a flap portion having either or both of the left side portion and the right side portion adjacent to the back portion and connected to each of the left side portion and the right side portion, the side wall portion having a quarter-circular glue tab portion at one end thereof for connecting to the other end thereof to form a circular side wall portion, the glue tab portion having an outer edge portion that is located on the side facing the bottom wall portion of the packaging box, the outer edge of the glue tab portion being formed as a straight line having a length of 3 mm or more extending in the row direction of the side wall portion near the connection portion of the outer edge of the arc portion to the side wall portion, and a connecting portion that connects the opposing edges of the lid portion and the flap portion in a point-like manner.

[0009] The packaging box of the above-mentioned form is easy to manufacture because the arc part of the glue edge part is a straight line of 3 mm or more in length, which makes it difficult for the side wall part to shift vertically during manufacturing. Also, by providing a connecting part that connects the opposing sides of the lid surface part and the flap surface part at points, these are connected and difficult to bend, making it easy to manufacture even when using a box-making machine.

[0010] The thickness of the packaging box of the above form is preferably 30 mm or less, and more preferably 21 mm or less, which makes it possible to put the box in a mailbox.

[0011] The packaging box of the above embodiment can have one to three connecting portions per pair of sides, which connects the lid surface portion and the flap surface portion, making it easier to manufacture the box using a box-making machine and easier to separate the box when separating the box.

[0012] In the packaging box of the above embodiment, the width of the adhesive surface portion protruding from one end of the side wall surface portion can be set to 15 mm or less, thereby reducing the area of ​​the adhesive surface portion and the amount of adhesive applied.

[0013] The packaging box of the above form has a basis weight of the paperboard of 310 to 350 g / m 2 This makes it difficult to bend and facilitates manufacturing.

[0014] It is preferable that the adhesive surface portion is connected to the back surface portion, so that when the paperboard is in an unfolded state, the lid surface portion is located at the end of the side wall surface portion, which makes it easier to manufacture the box using a box-making machine.

[0015] The packaging box may have a rectangular shape in plan view with a width of 150 mm to 300 mm and a length of 80 mm to 200 mm.

[0016] The cardboard of one embodiment of the present invention is a cardboard for forming a rectangular parallelepiped packaging box having a thickness of 21 mm or less, and has a basis weight of 310 to 350 g / m 2the packaging box includes a side wall surface portion having a front portion, a back portion, a left side portion, and a right side portion connected in a row, a lid surface portion connected to the back portion, and a flap surface portion having either or both of the left side portion and the right side portion adjacent to the back portion and connected to each of the left side portion and the right side portion, one end of the side wall surface portion is provided with a quarter-circular glue tab surface portion for connecting to the other end portion to form a circular side wall portion, the glue tab surface portion has an outer edge portion that is an arc on the side facing the bottom wall portion of the packaging box, and the vicinity of the connection portion of the outer edge arc portion to the side wall surface portion is formed as a straight line having a length of 3 mm or more extending in the row direction of the side wall surface portion, and includes a connecting portion connecting the opposing sides of the lid surface portion and the flap surface portion in a point-like manner.

[0017] In the above-mentioned paperboard, by forming the arc portion of the overlap surface into a straight line having a length of 3 mm or more, the side wall portion is less likely to shift vertically during manufacturing, making it easier to manufacture the packaging box. Also, by providing a connecting portion that connects the opposing edges of the lid surface and the flap surface at points, these are connected and less likely to bend, making it easier to manufacture the packaging box even when using a box-making machine. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention in an open state; FIG. [Diagram 2] FIG. 2 is a diagram showing an example of the unfolded state of the paperboard of the packaging box of FIG. 1. [Diagram 3] 3 is a partially enlarged view of the vicinity of the adhesive surface portion of the paperboard in FIG. 2 in an unfolded state. [Figure 4] 3 is a partially enlarged view of the vicinity of one opposing side of the lid surface portion and the flap surface portion in the unfolded state of the paperboard in FIG. 2. FIG. [Diagram 5] 2 is a perspective view of the packaging box of FIG. 1 as viewed from the bottom wall side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of a packaging box according to the present invention will be described with reference to the drawings.

[0020] As shown in FIG. 1, a packaging box 1 according to one embodiment of the present invention comprises a side wall portion 2 including a back portion 21, a left side portion 22, a front portion 23, and a right side portion 24, a lid portion 3 consisting of a lid surface portion 31, a flap portion 4 consisting of left and right flap surface portions 41, and a bottom wall portion 5. The packaging box 1 is preferably in the shape of a thin rectangular parallelepiped so that it can be dropped into a mailbox, and the thickness is preferably 30 mm or less, more preferably 21 mm or less. The width (length of the front part 23) is preferably 150 mm to 300 mm, and the length (length of the right side part 24) is preferably 80 mm to 200 mm, and more preferably the width is 180 mm to 250 mm, and the length is 100 mm to 180 mm. In the present invention, thin means that the thickness is small compared to the width, for example, a thickness of 1 / 5 or less of the width, preferably a thickness of 1 / 8 or less of the width, and more preferably a thickness of 1 / 10 or less of the width.

[0021] The packaging box 1 can be formed from a single piece of paperboard, for example the paperboard 6 shown in FIG. The paperboard 6 is not particularly limited, but has a basis weight of 310 to 350 g / m 2 This makes it difficult to bend and makes it easier to manufacture using a box-making machine or the like. From this perspective, the basis weight is 350 g / m 2 is more preferred.

[0022] As shown in Fig. 2, the paperboard 6 has a side wall portion 25 in which a back surface portion 21, a left side surface portion 22, a front surface portion 23, and a right side surface portion 24 are connected in a row, and a glue tab portion 7 provided on one end portion of the side wall portion 25 (back surface portion 21 in the embodiment of Fig. 2). Note that in Fig. 2, the side wall portion 25 of the paperboard 6 represents the surface that becomes the outside of the packaging box 1. One longitudinal edge of the side wall portion 25 includes a lid portion 31 connected to the back portion 21, a left flap portion 41 connected to the left side portion 22, a bottom plate portion 55 connected to the front portion 23, and a right flap portion 41 connected to the right side portion 24, and the other longitudinal edge of the side wall portion 25 includes a rear bottom portion 51 connected to the back portion 21, a left bottom portion 52 connected to the left side portion 22, a front bottom portion 53 connected to the front portion 23, and a right bottom portion 54 connected to the right side portion 24. The rear bottom portion 51, the left bottom portion 52, the front bottom portion 53, the left bottom portion 54, and the bottom plate portion 55 can form the bottom wall portion 5. In addition, compressed fold lines or the like are provided at the boundaries of each surface portion to enable bending.

[0023] In this embodiment, the side wall surface portions 25 of the paperboard 6 are arranged in the order of the back surface portion 21, the left side surface portion 22, the front surface portion 23, and the right side surface portion 24, but this order is not limited to this. However, it is preferable that the arrangement of the side wall surface portions 25 is such that the back surface portion 21 is provided at the end portion and that the back surface portion 21 is provided with the lid surface portion 31 and the glue tab surface portion 7, which makes it easier to manufacture when using a box-making machine. It is also preferable that the back surface portion 21 is adjacent to either or both of the left side surface portion 22 and the right side surface portion 24.

[0024] The glue tab surface portion 7 is in a quarter-circle shape, and is arranged so that the side facing the bottom wall portion 5 when the packaging box 1 is formed becomes an arcuate portion of the outer edge. The glue tab surface portion 7 can be connected to the other end portion of the side wall portion 25 (right side portion 24 in the embodiment of FIG. 2) by applying glue thereto, to form the circumferential bottom wall portion 5. The glue tab surface portion 7 is arranged to be located on the inside of the box 1 when the packaging box 1 is formed. As shown in Fig. 3, the vicinity of the connecting portion of the arc portion forming the outer edge to the side wall surface portion 25 (in the embodiment of Fig. 2, the vicinity of the fold line with the back surface portion 21) of the glue margin surface portion 7 is formed as a straight line extending in the row direction of the side wall surface portion 25. The row direction of the side wall surface portion 25 is the arrangement direction of the back surface portion 21, the left side surface portion 22, the front surface portion 23, and the right side surface portion 24. By making the length of this straight line (X in Fig. 3) 3 mm or more, misalignment of the ends is less likely to occur when the side wall portion 5 of the packaging box 1 is formed, making the manufacturing easier.

[0025] Moreover, it is preferable that the width of the adhesive surface portion 7 protruding from one end of the side wall surface portion 25 (Y in FIG. 3) is 15 mm or less. This makes it possible to reduce the amount of adhesive to be applied.

[0026] The lid surface portion 31 forms the lid portion 3 of the packaging box 1, and includes a rectangular covering portion 31a and an insertion portion 31b that serves as a piece to be inserted into the packaging box 1. The sides of the lid surface portion 31 facing the adjacent left flap surface portion 41 are connected by a connecting portion 8. As shown in FIG. 4, the connecting portion 8 is preferably formed in a dot shape, and is preferably provided in one to three places per pair of sides. This connects the lid surface portion 31 and the flap surface portion 41 and makes them less likely to bend, making them easier to manufacture using a box-making machine and easier to separate when they are separated. Note that the dot shape refers to a connection with a width of 2 mm or less, preferably 1.5 mm or less, and more preferably 1 mm or less.

[0027] The bottom plate surface portion 55 is formed in a rectangular shape and is placed on the top of the front, back, left and right bottom plate portions 51, 52, 53, 54 of the packaging box 1 to form the bottom wall portion 5. The bottom plate surface portion 55 is provided with a fold line 55a parallel to the longitudinal edge of the front portion 23, and is folded at the boundary with the front portion 23 to be placed on the inside of the front portion 23, and is further folded at this fold line 55a so that it can be placed on the bottom plate portions 51, 52, 53, 54. The bottom plate portion 55 is provided with a horizontally long trapezoidal cutout, which can be raised to form a partition 55b when the packaging box 1 is formed.

[0028] The rear bottom surface portion 51 and the front bottom surface portion 53 are substantially the same rectangular shape, with a trapezoidal cutout provided on the longitudinal edge portion opposite the side wall surface portion 25, and fastening portions 51a, 53a formed at one of the corners on the rear side of this cutout. In addition, the rear bottom surface portion 51 and the front bottom surface portion 53 are provided with diagonally running straight fold lines 51b, 53b, and one corner side is made into bonding surfaces 51c, 53c, which can be folded and overlapped. The left bottom portion 52 and the right bottom portion 54 have substantially the same trapezoidal shape. When forming the packaging box 1, the rear bottom portion 51 can be folded along the fold line 51b, overlapped, and then glue or the like applied to the overlapped portion and pasted onto the left bottom portion 52. Also, the front bottom portion 53 can be folded along the fold line 53b, overlapped, and then glue or the like applied to the overlapped portion and pasted onto the right bottom portion 54. When forming the bottom wall portion 5, the fastening portion 51a of the rear bottom portion 51 and the fastening portion 53a of the front bottom portion 53 are fastened together to form the bottom wall portion 5 of the packaging box 1 as shown in FIG.

[0029] When forming the packaging box 1 from the paperboard 6, it can be produced manually by a person, but it can also be produced mechanically using a box-making machine, and the paperboard 6 has been improved so that it can be produced by a box-making machine.

[0030] By forming part of the arcuate portion of the outer edge of the glue gap surface portion 7 as a straight line, when glue is applied to the side wall surface portions 25 and the side wall surface portions 25 are connected in a circular shape to form the side wall portion 2, this straight line runs along the bottom wall portion 5, making it less likely for the ends of the side wall surface portions 25 to become misaligned, and the box can be manufactured using a box-making machine.

[0031] Furthermore, because the cover surface portion 31 and the flap surface portion 41 of the paperboard 6 are connected by the connecting portion 8, the rigidity is maintained and the paperboard is less likely to become misaligned when the box is made into a box.

[0032] As described above, by using paperboard 6, the packaging box 1 is easy to manufacture, even if it is a thin rectangular prism-shaped packaging box that can be dropped into a mailbox, as it is less likely to shift position when pasted together and can be manufactured using a box-making machine.

[0033] The configuration aspects of the above-described embodiments are not presented as limitations of the present invention, and modifications are possible as long as the technical purpose is the same, and the present invention includes such modifications. [Explanation of symbols]

[0034] 1 packaging box 2 Side wall 21 Back section 22 Left side part 23 Front 24Right side part 25 Side wall section 3 Lid part 31 Lid surface part 31a Covering part 31b Insertion part 4 Flap section 41 Flap surface 5 Bottom wall 51 Rear bottom part 51a fastening part 51b broken line 51c Bonding surface 52 Left bottom part 53Front bottom part 53a Fastening part 53b Line 53c Bonding surface 54 Right bottom part 55Bottom plate surface part 55a broken line 55b Partition 6. Paperboard 7 Glue area 8 Joint

Claims

1. A packaging box having a thin rectangular parallelepiped shape formed from a single sheet of paperboard, The paperboard includes a side wall surface portion having a front portion, a back portion, a left side surface portion, and a right side surface portion that are aligned in a line, a cover surface portion connected to the back portion, and a flap surface portion in which either or both of the left side surface portion and the right side surface portion are adjacent to the back portion and connected to each of the left side surface portion and the right side surface portion, a quarter-circular adhesive surface portion is provided at one end of the side wall surface portion to be connected to the other end portion to form a circular side wall portion; The adhesive surface portion is located on the side facing the bottom wall portion of the packaging box, and the vicinity of the connection portion of the outer edge of the arc portion to the side wall surface portion is formed as a straight line having a length of 3 mm or more extending in the row direction of the side wall surface portion, A connecting portion is provided that connects the opposing sides of the lid surface portion and the flap surface portion in a dotted manner. packaging box.

2. 2. The packaging box according to claim 1, wherein the thickness of the packaging box is 30 mm or less.

3. 2. The packaging box according to claim 1, wherein the thickness of the packaging box is 21 mm or less.

4. The packaging box according to claim 3, wherein the connecting portions are provided at 1 to 3 locations per pair of sides.

5. 5. The packaging box according to claim 3, wherein the width of the adhesive surface portion protruding from one end of the side wall surface portion is 15 mm or less.

6. The basis weight of the paperboard is 310 to 350 g / m ２ The packaging box according to claim 3 or 4.

7. The packaging box according to claim 3 or 4, wherein the adhesive surface portion is connected to the back surface portion.

8. 5. The packaging box according to claim 3 or 4, wherein the packaging box has a rectangular shape in a plan view with a width of 150 mm to 300 mm and a length of 80 mm to 200 mm.

9. A paperboard for forming a rectangular parallelepiped-shaped packaging box having a thickness of 21 mm or less, Basis weight: 310-350g / m ２ and a side wall surface portion having a front portion, a rear portion, a left side surface portion, and a right side surface portion which are arranged in a line; a cover surface portion connected to the rear portion; and a flap surface portion having either or both of the left side surface portion and the right side surface portion adjacent to the rear portion and connected to each of the left side surface portion and the right side surface portion, a quarter-circular adhesive surface portion is provided at one end of the side wall surface portion to be connected to the other end portion to form a circular side wall portion; The adhesive surface portion is located on the side facing the bottom wall portion of the packaging box, and the vicinity of the connecting portion of the outer edge of the arc portion to the side wall surface portion is formed as a straight line having a length of 3 mm or more extending in the row direction of the side wall surface portion, A connecting portion is provided that connects the opposing sides of the lid surface portion and the flap surface portion in a dotted manner. Paperboard.

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