Packaging box, blank sheet and packaging

Abstract

To provide a packaging box capable of keeping a mouth of a bag body closed and preventing a content from leaking or overflowing from the bag body.SOLUTION: There is provided a paper packaging box 2A including a cylindrical body 10 and a top plate 20 and a bottom plate 30 provided at upper and lower openings of the body 10, in which a bag body 3 can be housed within the body 10. The top plate 20 has openings in a first fixing portion 50A and a second fixing portion 60A into which a bag mouth 3a of the bag body 3 can be inserted and which can hold the bag mouth 3a in a closed state.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a packaging box, a blank sheet, and a package. [Background technology]

[0002] Conventionally, when a bag containing fresh food, liquid, or other contents is placed in a cardboard packaging box, the opening of the bag is closed and turned upward to prevent the contents from leaking out of the bag (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-3025 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional packaging method described above, if the bag body shakes significantly during transportation of the packaging box, the opening of the bag body may face downward, causing the contents (including, for example, condensation water adhering to the contents and moisture seeping out from the contents) to leak out from the bag body, and if the contents contain powder or granular material, there is a risk that the contents will overflow.

[0005] The present invention aims to solve the above-mentioned problems and provide a packaging box, blank sheet, and package that can keep the bag mouth of the bag body closed and prevent the contents from leaking or overflowing from the bag body. [Means for solving the problem]

[0006] In order to solve the above problems, the first invention is a paper packaging box that includes a body formed in a cylindrical shape, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body, and is capable of accommodating a bag body within the body. A fixing portion is opened or cut into the top plate or the body, into which the bag mouth of the bag body can be inserted and which can hold the bag mouth in a closed state. In the present invention, the bag mouth refers to the end of the bag body on the bag mouth (opening) side. In addition, a state in which the bag mouth is closed refers to a state in which the bag mouth is squeezed (including a twisted state). In addition, the shape of the bag body in the present invention is not limited, and in addition to a bag formed by closing the bottom of a cylindrical body, it also includes, for example, a bag formed by bundling the four corners of a sheet of film.

[0007] In order to solve the above problem, the second invention is a blank sheet for forming the packaging box. That is, the second invention is a blank sheet for a paper packaging box that includes a cylindrical body, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body, and that can accommodate a bag body inside the body. A fixing portion is opened or cut into the top plate or the body, into which the bag mouth of the bag body can be inserted and which can hold the bag mouth in a closed state.

[0008] In order to solve the above problem, a third invention is a packaging body comprising a packaging box of the first invention and a bag body contained in the packaging box, and the bag body is inserted into the fixing portion with the bag mouth portion closed.

[0009] In the present invention, when the bag body is placed in the packaging box, the bag mouth of the bag body can be easily fixed to the packaging box by inserting the bag mouth of the bag body into the fixing part of the packaging box. This makes it possible to keep the bag mouth of the bag body in a closed state, thereby preventing the contents from leaking or overflowing from the bag mouth of the bag body.

[0010] In addition, in the present invention, the bag mouth of the bag body can be closed by squeezing the bag mouth and inserting it into the fixing part of the packaging box. This makes it unnecessary to tie or tape the bag mouth of the bag body, thereby improving the efficiency of the packaging work. Furthermore, even if the bag opening is tied or sealed with tape, for example, if the contents are liquid or other substances that are prone to leak, the present invention can further maintain the bag opening in a closed state, which is effective in sealing the bag body.

[0011] In the present invention, the shape of the opening or the cut of the fixing part is not limited to a slit, a hole, etc. If the fixing part is a recessed part formed on the edge part of the top plate or the body part, it becomes easy to insert the bag mouth part of the bag body into the fixing part.

[0012] In the present invention, when the fixing portion is formed by a retaining hole and an introduction portion extending from the edge of the top plate or the body portion to the retaining hole, it is preferable that the introduction portion is formed so that its width narrows toward the retaining hole, and that the retaining hole is wider than the end of the introduction portion on the retaining hole side. This makes it easier to insert the mouth of the bag body into the introduction portion of the fixing part, and also makes it difficult for the mouth of the bag fitted into the holding hole to slip out toward the introduction portion.

[0013] In the present invention, it is preferable that the two fixing portions are opened on the top plate or the wall so that the bag mouth portion can be inserted into both fixing portions and can be held by both fixing portions in a closed state. In this configuration, the bag mouth of the bag body is inserted into one of the fixing parts, and the bag mouth of the bag body is folded and the tip of the bag mouth of the bag body is inserted into the other fixing part. As a result, the bag mouth of the bag body is fixed to the packaging box in a folded state, so that it is possible to reliably prevent the contents from leaking or overflowing from the bag mouth of the bag body.

[0014] In the present invention, the packaging box may be made of cardboard. The type of the box is not limited, and may be type A or type B. If the packaging box is a general type A cardboard box, the manufacturing cost of the packaging box can be reduced.

[0015] In the present invention, when the top plate has an inner flap and an outer flap connected to the upper edge portion of the body, and the outer flap is superimposed on the outer surface of the inner flap, it is preferable that the fixing portion is formed on the inner flap. In this way, when the outer flap is placed on the outer surface of the inner flap and the top plate is closed, the bag mouth inserted into the fixing part of the inner flap is covered by the outer flap, improving the appearance of the packaging box. Also, since the bag mouth is held down by the outer flap, it is difficult for the bag mouth to come off from the fixing part.

[0016] In the present invention, when the bottom plate is a single flat plate and the body portion has a plurality of walls that are raised continuously from the edge of the bottom plate, it is preferable to configure the adjacent walls so that no gaps are formed in the corners of the bottom of the packaging box by making them continuous. In this way, even if condensation occurs on the surface of the bag due to the cooling agent or ice, water can be prevented from leaking from the bottom of the packaging box. As a configuration for connecting adjacent wall bodies, for example, an intermediate wall is provided between adjacent wall bodies in the blank sheet state, and when the wall bodies are erected, the intermediate wall is folded in half and overlapped on the inner surface of the wall body.

[0017] In the present invention, it is preferable that the inner surface of the bottom plate is waterproofed, and it is also preferable that the inner surfaces of the top plate and the body are waterproofed. In this way, even if condensation occurs on the surface of the bag, the water is less likely to seep into the packaging box.

[0018] When the above-mentioned packaging box is made of double-flute corrugated board, the cold insulation and heat insulation properties of the packaging box can be improved, and the strength of the packaging box can be increased. Furthermore, when a packaging box is made of single-flute corrugated board, production is easy and the amount of paper used can be reduced.

[0019] In the above-mentioned package, when the bag body is made of resin, it is possible to prevent moisture from leaking out of the bag body.

[0020] In the above-mentioned package, when a water-absorbing material is contained in the packaging box, even if condensation occurs on the surface of the bag body, the water is absorbed by the water-absorbing material, so that the water is less likely to seep into the packaging box. Effect of the Invention

[0021] In the present invention, the bag mouth of the bag body can be kept closed by inserting the bag mouth into the fixed portion of the packaging box, thereby preventing the contents from leaking or overflowing from the bag mouth of the bag body and improving the efficiency of the packaging work. [Brief description of the drawings]

[0022] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed obliquely from above and ahead. [Diagram 2] FIG. 2 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention. [Diagram 3] 1 is a perspective view showing a state in which an outer flap is opened in a packaging box according to an embodiment of the present invention. [Figure 4] 1 is a plan view showing a state in which an outer flap is opened in a packaging box according to an embodiment of the present invention. [Diagram 5] 1 is a perspective view showing a state in which a bag mouth portion of a bag body is inserted into a first fixing portion in a packaging body according to an embodiment of the present invention. FIG. [Figure 6] 1 is an oblique view showing a state in which a bag mouth portion of a bag body is inserted into a first fixing portion and a second fixing portion in a packaging body according to an embodiment of the present invention. FIG. [Figure 7] 1 is a side cross-sectional view showing a state in which a bag mouth portion of a bag body is inserted into a first fixing portion and a second fixing portion in a packaging body according to an embodiment of the present invention. [Figure 8] FIG. 13 is a perspective view showing a modified example of a packaging box according to an embodiment of the present invention, in which a fixing portion is formed in the body portion. [Figure 9] FIG. 13 is a plan view showing a first modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 10] FIG. 13 is a plan view showing a second modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 11] FIG. 13 is a plan view showing a third modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 12] FIG. 13 is a plan view showing a fourth modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 13] FIG. 13 is a plan view showing a fifth modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 14] FIG. 13 is a plan view showing a sixth modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 15] FIG. 13 is a plan view showing a modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 16] FIG. 13 is a plan view showing a modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 17] FIG. 13 is a plan view showing a ninth modified example of the fixing portion of the packaging box according to the embodiment of the present invention. [Figure 18] FIG. 13 is a diagram showing a modified example of the packaging box according to the embodiment of the present invention, showing a blank sheet for the packaging box having an intermediate wall. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, back, left and right directions are set for the convenience of describing the packaging body and packaging box of this embodiment, and do not limit the configuration or usage state of the packaging body and packaging box of the present invention.

[0024] As shown in FIG. 7, the package 1 of this embodiment includes a packaging box 2A (see FIG. 1) made of corrugated cardboard (paper) and a bag body 3 accommodated in the packaging box 2A. In this embodiment, the bag body 3 is formed into a bag shape by closing the bottom of a cylindrical body and forming a bag mouth portion 3a at the top, but the shape of the bag body 3 is not limited to this and may be, for example, a bag shape formed by bundling the four corners of a sheet of film. The material of the bag body 3 is not limited, and resin or paper can be used. From the viewpoint of reducing the environmental burden, it is preferable to use a biodegradable resin such as polylactic acid (PLA), polyglycolic acid (PGA), polybutylene succinate (PBS), etc., or, from the viewpoint of maintaining the freshness of the contents, to use an MA film (e.g., P Plus (registered trademark) manufactured by Sumitomo Bakelite Co., Ltd.), which is a resin film in which the balance between the gas transmission rate and the respiration rate of fruits and vegetables is adjusted. Furthermore, there is no limitation on the contents stored in the bag body 3. In this embodiment, a case will be described as an example in which fresh foods such as vegetables and fruits and a cooling agent are stored as contents in the bag body 3 made of resin such as polyethylene or polypropylene. A bag mouth is opened at one end of the bag body 3. In the following description, the bag mouth portion 3a of the bag body 3 refers to the end portion of the bag body 3 on the bag mouth side.

[0025] 1, the packaging box 2A of this embodiment includes a cylindrical body 10, a top plate 20 provided at an upper opening of the body 10, and a bottom plate 30 provided at a lower opening of the body 10. The packaging box 2A of this embodiment is an A-type cardboard box using single-flute cardboard.

[0026] The packaging box 2A of this embodiment is formed by mountain-folding or valley-folding a blank sheet S1 cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S1 shown in Fig. 2 is arranged so that the inner side is visible. The fold lines of the blank sheet S1 are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S1. Note that the creases may be formed with intermittent cuts. In this way, it becomes easier to fold the blank sheet S1 at the creases. Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or a slit penetrating the sheet in an intermittent linear fashion.

[0027] 1, the body 10 includes a pair of front and rear walls 11, 11 and a pair of left and right walls 12, 12. In this embodiment, the four walls 11, 12 form the body 10 in a rectangular cylindrical shape in a plan view.

[0028] The top plate 20 includes a pair of front and rear inner flaps 21, 21 connected to the upper edges of the front and rear walls 11, 11 via fold lines, and a pair of left and right outer flaps 22, 22 connected to the upper edges of the left and right walls 12, 12 via fold lines (see FIG. 2). The top plate 20 is formed by overlapping the two outer flaps 22, 22 on the upper surfaces of the two inner flaps 21, 21.

[0029] The bottom plate 30 includes a pair of front and rear inner flaps 31, 31 connected to the lower edge portions of the front and rear wall bodies 11, 11 via fold lines, and a pair of left and right outer flaps 32, 32 connected to the lower edge portions of the left and right wall bodies 12, 12 via fold lines (see FIG. 2). The bottom plate 30 is formed by overlapping the two outer flaps 32, 32 on the lower surfaces of the two inner flaps 31, 31.

[0030] In the packaging box 2A of the present embodiment, as shown in Fig. 3, a first fixing portion 50A and a second fixing portion 60A are formed on the inner flap 21 on the front side of the top plate 20. As shown in Fig. 6, the first fixing portion 50A and the second fixing portion 60A are portions into which the bag mouth portion 3a of the bag body 3 is inserted.

[0031] 4, the first fixing portion 50A is a recessed portion formed in the tip portion (rear edge portion) of the front inner flap 21. In this embodiment, the first fixing portion 50A is formed in the center portion of the inner flap 21 in the left-right direction.

[0032] The first fixing portion 50A has a circular retaining hole 53, a first introduction portion 51 formed at the tip edge portion of the inner flap 21, and a second introduction portion 52 extending from the first introduction portion 51 to the retaining hole 53. The first introduction portion 51 is a recess formed in the leading edge portion of the inner flap 21, and the left and right corners are curved in an arc shape. The second introduction portion 52 is a long and narrow opening portion (an opening portion punched out from a sheet) that extends from the center of the bottom of the first introduction portion 51 to the holding hole 53 .

[0033] In first fixing portion 50A, the maximum width of second introduction portion 52 is narrower than the maximum width of first introduction portion 51. Moreover, second introduction portion 52 is formed so that its width narrows toward retaining hole 53. Moreover, the inner diameter of retaining hole 53 is wider than the end portion (front end portion) of second introduction portion 52 on the retaining hole 53 side.

[0034] The width of the second introduction section 52 is not limited, and is set to a width that allows the bag mouth portion 3a of the bag body 3 to pass through in a closed (squeezed) state, as shown in Figure 5. The size and shape of the holding hole 53 are not limited as long as the bag mouth 3a of the bag body 3 is held in the holding hole 53 in a closed state. When the bag mouth 3a in the closed state is fitted into the holding hole 53, the bag mouth 3a is kept in a closed state.

[0035] The second fixed portion 60A is formed at a position separated from the first fixed portion 50A, as shown in Fig. 4. In other words, the first fixed portion 50A and the second fixed portion 60A are provided independently of each other and are not in communication with each other. The second fixing portion 60A in this embodiment is disposed in the left-right center of the inner flap 21, between the retaining hole 53 of the first introduction portion 51 and the base end edge of the inner flap 21. That is, the second fixing portion 60A is disposed on the front wall 11 side with a gap therebetween with respect to the retaining hole 53. Note that, although the second fixing portion 60A is disposed in front of the first fixing portion 50A (on an extension of the second introduction portion 52) in this embodiment, the second fixing portion 60A may be disposed on the left and right of the first fixing portion 50A.

[0036] As shown in Figure 5, the tip of the bag mouth portion 3a in the closed state is faced upward and inserted into the retaining hole 53 of the first fixing part 50A, and then, as shown in Figure 6, the bag mouth portion 3a can be folded on the outer surface side of the inner flap 21, and the tip of the bag mouth portion 3a can be inserted into the second fixing part 60A. The size and shape of the second fixing part 60A are not limited, but are set so as to make it easy to insert the tip of the bag mouth part 3a. In this embodiment, the inner diameter of the second fixing part 60A is formed to be larger than the inner diameter of the holding hole 53 of the first fixing part 50A (see FIG. 4). This makes it easy to insert the tip of the bag mouth part 3a into the second fixing part 60A.

[0037] Next, a method for assembling the package 1 will be described. First, the blank sheet S1 shown in FIG. 2 is folded along each fold line to form the body 10 and the bottom plate 30 of the packaging box 2A shown in FIG. 5, with the top plate 20 of the packaging box 2A open, the bag 3 containing the fresh food and the ice pack is placed in the body 10. At this time, the bag mouth 3a of the bag 3 is oriented upward.

[0038] After the bag body 3 is placed in the body 10, the inner flap 21 is folded against the wall body 11. Then, the bag mouth portion 3a of the bag body 3 is squeezed (twisted as necessary), and in this state, the bag mouth portion 3a is inserted into the first introduction portion 51 and then the second introduction portion 52 of the first fixing part 50A, and the bag mouth portion 3a is fitted into the holding hole 53. As a result, the bag mouth portion 3a is held in a closed state by the first fixing part 50A.

[0039] 6, the bag mouth portion 3a is folded on the outer surface side of the inner flap 21, and the tip of the bag mouth portion 3a is inserted into the second fixing portion 60A from the outside. As a result, the bag mouth portion 3a is fixed to the inner flap 21 of the packaging box 2A in the folded state. Then, the outer flap 22 is closed and overlapped on the outer surface of the inner flap 21 as shown in Fig. 7. In this manner, the top plate 20 is formed and the upper opening of the packaging box 2A is closed.

[0040] In the above-described packaging body 1, as shown in FIG. 6, the bag mouth portion 3a of the bag body 3 can be easily fixed to the top plate 20 of the packaging box 2A by inserting the bag mouth portion 3a into the first fixing portion 50A and the second fixing portion 60A of the packaging box 2A. This keeps the bag mouth 3a of the bag body 3 in a closed state facing upward, preventing the contents (including, for example, condensation water on the contents and moisture seeping out from the contents) from leaking or spilling out from the bag mouth 3a. Also, the cool air inside the bag body 3 is less likely to escape. In addition, since the bag body 3 is made of resin and has water impermeability, it is possible to prevent moisture from seeping out of the bag body 3.

[0041] In this embodiment, the bag mouth portion 3a of the bag body 3 can be squeezed and inserted into the first fixing portion 50A and the second fixing portion 60A of the packaging box 2A, thereby enabling the bag mouth portion 3a to be securely closed, thereby improving work efficiency when packing the packaging body 1. Furthermore, even if the bag mouth portion 3a is tied or closed with tape, the bag mouth portion 3a is still maintained in a closed state, which is effective for sealing the bag body 3 when the contents are prone to leaking, such as liquid.

[0042] 4, the first fixing portion 50A in this embodiment is a recess formed in the leading edge portion of the inner flap 21, and the first introduction portion 51 is wider than the second introduction portion 52, which narrows toward the retaining hole 53. This makes it easy to insert the bag mouth portion 3a into the first fixing portion 50A. In addition, in this embodiment, the inner diameter of the retaining hole 53 is formed wider than the end of the second introduction section 52 on the retaining hole 53 side, so that the bag mouth section 3a fitted into the retaining hole 53 is less likely to slip out toward the second introduction section 52 side.

[0043] In this embodiment, as shown in Figure 7, when the outer flap 22 is overlapped on the outer surface of the inner flap 21 and the top plate 20 is closed, the bag mouth portion 3a of the bag body 3 arranged on the outer surface side of the inner flap 21 is covered by the outer flap 22, making it difficult for the bag mouth portion 3a to come off the first fixing portion 50A and the second fixing portion 60A and improving the appearance of the packaging body 1.

[0044] The packaging box 2A of this embodiment is a general type A corrugated cardboard box as shown in Fig. 1, so that the manufacturing cost can be reduced. Furthermore, the packaging box 2A is formed from single-flute corrugated cardboard, so that the manufacturing is easy and the amount of paper used can be reduced.

[0045] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. In the packaging box 2A of this embodiment, as shown in FIG. 2, the first fixing portion 50A and the second fixing portion 60A are formed on the inner flap 21 of the top plate 20, but the positions of the first fixing portion 50A and the second fixing portion 60A are not limited. For example, as shown in FIG. 8, the first fixing portion 50A and the second fixing portion 60A may be formed on the wall 11 of the body 10. In this configuration, the first fixing portion 50A is a recessed portion formed on the upper edge portion of the wall 11. The packaging box 2B shown in FIG. 8 is a B-type cardboard box. 8, the first fixing part 50A is a recessed part formed in the upper edge part of the wall body 11, but the first fixing part 50A and the second fixing part 60A may be formed in the center part or the lower edge part of the wall body 11. Since the contents are stored on the lower edge part side, it is preferable to provide the fixing part on the upper edge part because the contents are less likely to leak. Although not shown in the drawings, the first fixing portion 50A may be formed on the top plate 20 (the inner flap 21), and the second fixing portion 60A may be formed on the body portion 10. Alternatively, the second fixing portion 60A may be formed at a corner between the inner flap 21 and the body portion 10.

[0046] The first fixing portion 50A and the second fixing portion 60A of the present embodiment can be formed by punching out the top plate 20 or the body portion 10 of various cardboard boxes. Also, the first fixing portion 50A and the second fixing portion 60A may be opened by folding back the cover plate covering the first fixing portion 50A and the second fixing portion 60A inward or outward. In this embodiment, the first fixing portion 50A and the second fixing portion 60A are formed by punching a cardboard sheet, but the method of forming the fixing portions is not limited. For example, the fixing portions may be formed by providing perforations in which a plurality of slits are formed linearly, and the worker may cut open the perforations to form the fixing portions, or the fixing portions may be opened by folding the inside of the fixing portions.

[0047] The packaging box 2A of this embodiment is an A-type cardboard box as shown in Fig. 1, but the present invention does not limit the type of packaging box. The shape of the body 10 is also not limited, and it may be formed into a polygonal cylinder such as a pentagon, hexagon, or octagon, in addition to a rectangular cylinder.

[0048] In this embodiment, as shown in Figures 5 and 6, the bag mouth portion 3a is inserted in the order of the first fixing portion 50A and the second fixing portion 60A, but the bag mouth portion 3a may also be inserted in the order of the second fixing portion 60A and the first fixing portion 50A.

[0049] Furthermore, the inner surface of the packaging box 2A may be subjected to a waterproofing treatment. In this way, even if condensation occurs on the surface of the bag body 3, the water is less likely to seep into the packaging box 2A. Since liquids such as water tend to accumulate on the bottom surface of the packaging box 2A, it is preferable to apply a waterproofing treatment to at least the inner surface of the bottom plate 30 among the inner surfaces of the packaging box 2A. Examples of waterproofing include coating the inner surface of the cardboard sheet with a water repellent or waterproofing agent such as wax or synthetic resin, or providing the inner surface of the cardboard sheet with a resin film. In addition, by placing absorbent materials such as craft paper, absorbent polymers, and airlaid nonwoven fabric (for example, Hatosheet (registered trademark) manufactured by Oji Kinocloth) in the packaging box 2A and allowing the absorbent material to absorb the water caused by condensation in the bag body 3, it is possible to make it difficult for water to seep into the packaging box 2A.

[0050] The packaging box 2A of this embodiment is formed from single-flute cardboard; however, if double-flute cardboard is used, the cold and heat retention properties of the packaging box 2A can be improved and the strength of the packaging box 2A can be increased. Regarding the corrugated board, A-flute, B-flute, C-flute, W-flute, E-flute, etc. can be used without any particular limitation, and three-ply corrugated board (for example, Hi-Pul Ace (registered trademark) manufactured by Oji Interpack Co., Ltd.) etc. may also be used. The basis weight of the liner is also not particularly limited, and for example, the basis weight of the entire liner is 70 to 550 g / m 2 From the viewpoint of strength and processability, the thickness is preferably 100 to 500 g / m 2 is preferable, and 150 to 450 g / m 2 is more preferred. The weight of the core is not particularly limited, and is preferably 120 to 200 g / m from the viewpoint of strength and processability. 2 The above can be suitably used. A reinforced core in which the core is hardened with a chemical may also be used. In addition, when manufacturing the cardboard sheet used in the packaging box of the present invention, an adhesive is used to bond the liner and the core, and it is preferable to use a water-resistant adhesive from the viewpoint of preventing the strength of the cardboard box from being reduced by water exposure, condensation, humidity, etc. Furthermore, although the packaging box 2A of this embodiment is made of corrugated cardboard, the packaging box may be made of various known paperboards.

[0051] The shape of the fixing portion is not limited. In this embodiment, as shown in Fig. 4, the first fixing portion 50A is a recessed portion formed in the tip edge portion of the inner flap 21, but the first fixing portion 50A may be a recessed portion formed in another edge portion, such as the base end edge portion of the inner flap 21. In addition, in this embodiment, as shown in FIG. 1, the first fixing portion 50A and the second fixing portion 60A are formed on the front inner flap 21, but the first fixing portion 50A and the second fixing portion 60A may also be formed on the rear inner flap 21 or on both inner flaps 21, 21.

[0052] In addition, in this embodiment, as shown in FIG. 4, the first fixing portion 50A and the second fixing portion 60A are formed on the inner flap 21, but the first fixing portion 50A and the second fixing portion 60A may also be formed on the outer flap 22. Furthermore, the configuration of the top plate 20 is not limited. For example, when the top plate 20 is formed from a single flat plate, the fixing portion may be formed on the flat plate.

[0053] In the present embodiment, the first fixing portion 50A is formed with the first introduction portion 51, the second introduction portion 52, and the holding hole 53, but the shape of the fixing portion is not limited in the present invention. In the present embodiment, the first fixing portion 50A is opened by punching a cardboard sheet, but a slit-shaped fixing portion may be formed by cutting the sheet linearly.

[0054] As in the case of a first fixing portion 50B shown in FIG. 9, the fixing portion may be formed by an introduction portion 54 whose width narrows from the tip edge of the inner flap 21 toward the holding hole 53, and the holding hole 53. Also, like first fixing portion 50C shown in FIG. 10, the fixing portion may be formed in a simple shape by using introduction portion 54 of a constant width and holding hole 53.

[0055] Furthermore, as shown in FIG. 11, when the entire fixing portion is a linear opening having a constant width, like the first fixing portion 50D, processing of the inner flap 21 becomes easy. 12, fold lines L1, L1 may be formed on both the left and right sides of the first fixing portion 50D. The fold line L1 is a perforation or a ruled line formed on the inner surface of the inner flap 21 from the end (front end) of the first fixing portion 50D on the wall body 11 side to the tip edge of the inner flap 21. In this configuration, folding the left and right sides of the first fixing portion 50D at both fold lines L1, L1 makes it easier to insert the bag mouth of the bag body into the first fixing portion 50D.

[0056] 13, the inner peripheral edge of the retaining hole 53 may be uneven. In this configuration, the bag mouth 3a of the bag body 3 fitted into the retaining hole 53 is caught by the unevenness of the inner peripheral edge of the retaining hole 53, making it difficult for the bag mouth 3a to come out of the retaining hole 53. Note that, like the first fixing part 50E, the inner peripheral edge of the second fixing part 60A may be uneven.

[0057] 14, multiple cover plates 53a may be provided in the retaining hole 53, and each cover plate 53a may be connected to the inner peripheral edge of the retaining hole 53 via a fold line L2. In this configuration, when the bag mouth portion 3a of the bag body 3 is inserted into the retaining hole 53, each cover plate 53a is bent at the fold line L2 to open the retaining hole 53. Then, each cover plate 53a is caught by the bag mouth portion 3a fitted into the retaining hole 53, so that the bag mouth portion 3a is less likely to come out of the retaining hole 53.

[0058] In this embodiment, the first fixing portion 50A and the second fixing portion 60A are formed as shown in Fig. 4, but only the first fixing portion 50A may be formed as shown in Fig. 15. Also, only the second fixing portion 60A may be formed as shown in Fig. 16. As shown in Figure 16, when only the second fixing portion 60A is formed, the bag mouth portion 3a may be inserted into the second fixing portion 60A from the lower side (inside), or the bag mouth portion 3a may be inserted into the second fixing portion 60A from the upper side (outside).

[0059] In this embodiment, the second fixing portion 60A is formed in a hole shape as shown in Fig. 4, but the arrangement and shape of the second fixing portion 60A are not limited. For example, the second fixing portion 60A may be arranged on the left and right sides of the inner flap 21. Also, for example, the second fixing portion 60A may be arranged on the left and right sides of the first fixing portion 50A. 17, similarly to the first fixing part 50D, the second fixing part 60B may be formed by a recess formed in the leading edge part of the inner flap 21. Even in this configuration, the bag mouth of the bag body can be inserted into the first fixing part 50D and the second fixing part 60B, so that the bag mouth can be fixed to the top plate 20 in a state where it is folded upward.

[0060] The shape of the packaging box to which the present invention can be applied is not limited, and for example, as in the packaging box assembled from the blank sheet S2 shown in Fig. 18, the bottom plate 30 may be a single flat plate, and the body may be formed by a plurality of walls 11, 12 erected from the edge of the bottom plate 30. In the blank sheet S2 shown in Fig. 18, the adjacent walls 11, 12 are continuous with each other via an intermediate wall 13. In this configuration, when the walls 11, 12 are raised against the bottom plate 30, the middle wall 13 is folded in half and overlapped on the inner surface of the wall 11. In this type of packaging box, no gaps are formed at the corners of the bottom, so that even if condensation occurs on the surface of the bag, water can be prevented from leaking from the bottom of the packaging box. [Explanation of symbols]

[0061] 1 Package 2A Packaging box (this embodiment) 2B Packaging box (variant) 3 Bag body 3a Bag opening 10. Torso 11 Front and rear walls 12 Left and right walls 13 Intermediate Wall 20 Top plate 21 Inner flap 22 Outer flap 30 Bottom plate 31 Inner flap 32 Outer flap 50A First fixing part (this embodiment) 50B First fixing portion (modified example) 50C First fixing part (modified example) 50D First fixing part (modified version) 50E First fixing portion (modified form) 50F First fixing part (variation) 51 First Introduction 52 Second introduction 53 Retaining hole 53a Lid plate 54 Introduction 60A Second fixing portion (present embodiment) 60B Second fixing portion (modified example) S1 Blank sheet (this embodiment) S2 Blank sheet (variation)

Claims

1. A cylindrical body portion; A top plate provided at an upper opening of the body portion; A bottom plate provided at an opening on the lower side of the body portion, A paper packaging box capable of accommodating a bag body in the body portion, A packaging box characterized in that the top plate or the body portion has an opening or a cut-out for a fixing portion into which the bag mouth of the bag body can be inserted and which can hold the bag mouth in a closed state.

2. The packaging box according to claim 1, The packaging box according to claim 1, wherein the fixing portion is a recessed portion formed on an edge of the top plate or the body portion.

3. The packaging box according to claim 2, The fixing portion has: Retaining holes and an introduction portion extending from an edge of the top plate or the body portion to the retention hole; The introduction portion is formed so as to have a width that narrows toward the holding hole, The packaging box according to claim 1, wherein the holding hole is wider than the end of the introduction portion on the holding hole side.

4. The packaging box according to claim 1, The top plate or the body portion has two fixing portions opening therein, A packaging box, characterized in that the bag mouth can be inserted into both of the fixing parts and can be held by both of the fixing parts in a closed state.

5. The packaging box according to claim 1, The top plate is An inner flap and an outer flap are provided adjacent to the upper edge of the body, The outer flap is overlapped on the outer surface of the inner flap, The packaging box is characterized in that the fixing portion is formed on the inner flap.

6. The packaging box according to claim 1, The bottom plate is a flat plate. The body portion is formed by a plurality of walls that are continuously raised from the edge portion of the bottom plate, A packaging box characterized in that adjacent walls are continuous.

7. The packaging box according to claim 1, The packaging box is characterized in that the inner surface of the bottom plate is waterproofed.

8. The packaging box according to claim 1, A packaging box formed from double-flute corrugated cardboard.

9. A cylindrical body portion; A top plate provided at an upper opening of the body portion; A bottom plate provided at an opening on the lower side of the body portion, A blank sheet for a paper packaging box capable of accommodating a bag body in the body portion, A blank sheet characterized in that the top plate or the body portion has an opening or cut-out for a fixing portion into which the bag mouth of the bag body can be inserted and which can hold the bag mouth in a closed state.

10. The packaging box according to any one of claims 1 to 8, A bag body contained in the packaging box, A package characterized in that the bag body is inserted into the fixing portion with the bag opening portion closed.

11. The package of claim 10, The package, wherein the bag body is made of resin.

12. The package of claim 10, A package characterized in that a water-absorbing material is contained in the packaging box.

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