Packaging box and method for forming packaging box

Abstract

To provide a packaging box with high adhesive strength and a method of forming a packaging box that can reduce production costs.SOLUTION: A packaging box 1 is made of a material with a metal or resin layer formed on the surface of a base paper. The packaging box has: a box body forming piece 10 having a cylindrical body 11 with a front board 21 and a back board 23 facing each other, an inner lid board 43B extending at one end of the back board 23, and an outer lid board 41B extending at one end of the front board 21 and overlapping the surface side of the inner lid board 43B; a paper material 81 adhered to a part of the surface of the inner lid board 43B to expose the inner lid board 43B from the periphery; and adhesive 9 applied to each of the surfaces of the paper material 81 and the inner lid board 43B to bond the inner lid board 43B and the outer lid board 41B.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging box and a method for forming the packaging box.

Background Art

[0002] Since vapor-deposited paper has a smooth surface with a metallic luster and excellent aesthetic properties, it is widely used as a material for packaging boxes for cosmetics, pharmaceuticals, foods, luxury goods, etc., for example, for the purpose of enhancing the texture and premium feeling of the contents. However, as described above, since the surface of vapor-deposited paper is smooth and metallic, it has poor impregnability with adhesives. In particular, with adhesives (such as hot melt) commonly used in sealing packaging boxes on an automatic packaging line, sufficient adhesive strength may not be obtained depending on the conditions, and unintentional pre-opening may occur.

[0003] Therefore, Patent Document 1 is known as a configuration for enhancing the adhesive strength of a packaging box using vapor-deposited paper. The packaging box described in Patent Document 1 has a blank (box body forming piece) formed by a first side plate, a back plate, a second side plate, a front plate, and a connecting piece connected in the lateral direction, a first end plate and an insertion piece extending from the upper end of the back plate, a second end plate and an insertion piece extending from the lower end of the back plate, and four flaps extending from the upper and lower ends of the first and second side plates. The blank is a so-called "vapor-deposited paper", and a vapor-deposited film is laminated only on the surface side, and the back surface of the base paper is exposed over the entire back surface side. Further, a welded paper is welded on the surface side of each insertion piece, that is, on the vapor-deposited film.

[0004] The packaging box with such a structure is assembled as follows. First, a welding paper is welded to the blank sheet. Next, the blank sheet is punched to obtain a blank. Then, the first side panel, the back panel, the second side panel, the front panel, and the connecting piece are each bent at 90 degrees, and the connecting piece and the first side panel are adhered to form a square tube-shaped cylinder. Next, the two flaps on the lower end side, the second end panel, and the insertion part are each bent. Next, hot melt (adhesive) is applied to the surface of the welding paper thermally welded to the insertion part, the insertion part is inserted into the cylinder, and the surface of the insertion part is adhered to the back surface of the front panel to seal the lower end of the cylinder.

[0005] Next, after filling the cylinder with the contents, the two flaps on the upper end side, the first end panel, and the insertion part are each bent. Next, hot melt (adhesive) is applied to the surface of the welding paper thermally welded to the insertion part, the insertion part is inserted into the cylinder, and the surface of the insertion part is adhered to the back surface of the front panel to seal the upper end of the cylinder.

[0006] Thus, in the packaging box described in Patent Document 1, by applying an adhesive to the welding paper welded to the insertion piece, the impregnability of the hot melt (adhesive) is enhanced, and the adhesive strength of the packaging box is improved.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the packaging box of Patent Document 1, even if the adhesive strength between the welding paper and the front panel can be increased, depending on the strength of the heat welding, the welding paper may peel off from the insertion portion. Therefore, it is insufficient as a configuration for increasing the adhesive strength. Further, in the packaging box of Patent Document 1, since the welding paper is welded to the blank sheet before punching the blank from the blank sheet, there are many disadvantages in forming the packaging box, and in particular, the production cost tends to be high.

[0009] The present invention has been made in view of the above problems, and an object thereof is to provide a packaging box having high adhesive strength and a method for forming a packaging box capable of reducing production costs.

Means for Solving the Problems

[0010] Such an object is achieved by the present invention of the following (1) to (9).

[0011] (1) A box body forming piece made of a material having a metal layer or a resin layer formed on the surface of a base paper, comprising a cylindrical body having a first main panel and a second main panel arranged opposite to each other, an inner lid plate extending from one end of the second main panel, and an outer lid plate extending from one end of the first main panel and overlapping the surface side of the inner lid plate. A paper material adhered to a part of the surface of the inner lid plate and having the inner lid plate exposed from the periphery. An adhesive applied to each of the surface of the paper material and the surface of the inner lid plate for adhering the inner lid plate and the outer lid plate, characterized in that it is a packaging box.

[0012] (2) The packaging box according to (1) above, wherein the paper material is adhered to the inner lid plate via an adhesive.

[0013] (3) The packaging box according to (1) above, wherein the adhesive is applied in a line shape so as to straddle the paper material and the inner lid plate.

[0014] (4) It is made of a material with a metal layer or a resin layer formed on the surface of the base paper, and includes a cylindrical body having a first main panel and a second main panel arranged opposite to each other, a cover plate extending from one end of the second main panel, and an insertion piece extending from one end of the cover plate and inserted into the back side of the first main panel. A paper material adhered to a part of the surface of the insertion piece, with the insertion piece exposed from the surroundings. A packaging box, characterized by having an adhesive applied to the surface of the paper material and the surface of the insertion piece respectively, for adhering the insertion piece and the first main panel.

[0015] (5) The packaging box according to (4) above, wherein the paper material is adhered to the insertion piece via an adhesive.

[0016] (6) The packaging box according to (4) above, wherein the adhesive is applied in a line so as to straddle the paper material and the insertion piece.

[0017] (7) The adhesive is composed of an acrylic adhesive or a rubber-based adhesive, and the packaging box according to (2) or (5) above, wherein the adhesive is composed of a polyolefin-based or EVA-based hot melt. The packaging box according to (2) or (5) above, wherein the adhesive is composed of a polyolefin-based or EVA-based hot melt.

[0018] (8) A method for forming a packaging box, comprising the steps of punching out a blank sheet made of a material with a metal layer or a resin layer formed on the surface of the base paper to obtain a box body forming piece having a cylindrical body with a first main panel and a second main panel arranged opposite to each other, an inner cover plate extending from one end of the second main panel, and an outer cover plate extending from one end of the first main panel; adhering a paper material to the surface of the inner cover plate via an adhesive; applying an adhesive to the surface of the paper material; and overlapping the outer cover plate on the surface side of the inner cover plate and adhering the inner cover plate and the outer cover plate with the adhesive. The step of adhering a paper material to the surface of the inner cover plate via an adhesive. The step of applying an adhesive to the surface of the paper material. The step of overlapping the outer cover plate on the surface side of the inner cover plate and adhering the inner cover plate and the outer cover plate with the adhesive.

[0019] Step of punching out a blank sheet made of a material having a metal layer or a resin layer formed on the surface of a base paper to obtain a box body forming piece having a cylindrical body provided with a first main surface plate and a second main surface plate arranged opposite to each other, a lid plate extending from one end of the second main surface plate, and an insertion piece extending from one end of the lid plate. Step of adhering a paper material to the surface of the insertion piece via an adhesive. Step of applying an adhesive to the surface of the paper material. A method for forming a packaging box, comprising: inserting the insertion piece into the back surface side of the first main surface plate, and adhering the insertion piece and the first main surface plate with the adhesive.

Advantages of the Invention

[0020] According to the packaging box of the present invention, high adhesive strength can be exhibited, and unintentional pre-opening can be effectively prevented. Further, according to the method for forming the packaging box of the present invention, the packaging box can be formed inexpensively and with high precision.

Brief Description of the Drawings

[0021]

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Mode for Carrying Out the Invention

[0022] <First Embodiment> The packaging box 1 shown in Fig. 1 is formed by assembling box body forming pieces 10 integrally formed by punching out a paper blank sheet. The box body forming piece 10 is a processed paper with a metal layer or a resin layer (hereinafter also referred to as a "surface layer" for convenience of explanation) formed on the surface (one main surface) of the base paper. Specifically, various metal vapor deposition papers such as aluminum vapor deposition paper, various metal foil papers such as aluminum foil paper, plastic laminated paper, etc. are included.

[0023] As shown in Fig. 2, the aluminum vapor deposition paper is a paper obtained by laminating a plastic film (for example, a PET film) on which aluminum is vapor-deposited on the surface of a base paper (for example, a white paper such as coated cardboard, uncoated cardboard, or pulp paper such as thick paper). Also, as shown in Fig. 3, the aluminum foil paper is a paper obtained by directly laminating an aluminum foil on the surface of the base paper. Further, as shown in Fig. 4, the plastic laminated paper is a paper obtained by laminating a plastic film on the surface of the base paper. As shown in Figs. 2 to 4, in the aluminum vapor deposition paper, the aluminum foil paper, and the plastic laminated paper, the back surface of the base paper is exposed over the entire surface on the back side. Such processed paper has a smooth and glossy surface and excellent aesthetic properties, and is therefore widely used as a material for packaging boxes for cosmetics, pharmaceuticals, foods, luxury goods, etc. for the purpose of enhancing, for example, the texture and premium feeling of the contents.

[0024] Fig. 1 is a developed view of the box body forming piece 10 as seen from the surface side. Hereinafter, for convenience of explanation, the upper side in Fig. 1 is referred to as "upper" and the lower side as "lower".

[0025] The box body forming piece 10 has pasting pieces 20 connected in the horizontal direction, a front panel 21 as the first main panel, side panels 22, a back panel 23 as the second main panel, and side panels 24. Also, the pasting pieces 20, the front panel 21, the side panels 22, the back panel 23, and the side panels 24 are separated by folding lines 30, 31, 32, 33 extending in the vertical direction. Specifically, the pasting piece 20 and the front panel 21 are separated by the folding line 30, the front panel 21 and the side panel 22 are separated by the folding line 31, the side panel 22 and the back panel 23 are separated by the folding line 32, and the back panel 23 and the side panel 24 are separated by the folding line 33.

[0026] Also, an inner lid plate 43A extends from the upper end of the back plate 23. The back plate 23 and the inner lid plate 43A are separated by a folding line 53A extending in the horizontal direction. Similarly, an inner lid plate 43B extends from the lower end of the back plate 23. The back plate 23 and the inner lid plate 43B are separated by a folding line 53B extending in the horizontal direction.

[0027] Also, a broken line 231A is formed at the upper end of the back plate 23. The broken line 231A is formed at the boundary between the back plate 23 and the inner lid plate 43A so as to divide them, with both ends along the folding line 53A and the central part in a U shape that penetrates from the folding line 53A into the back plate 23. And the portion surrounded by the broken line 231A and the folding line 53A of the back plate 23 becomes the opening piece 230A.

[0028] Similarly, a broken line 231B is formed at the lower end of the back plate 23. The broken line 231B is formed at the boundary between the back plate 23 and the inner lid plate 43B so as to divide them, with both ends along the folding line 53B and the central part in a U shape that penetrates from the folding line 53B into the back plate 23. And the portion surrounded by the broken line 231B and the folding line 53B of the back plate 23 becomes the opening piece 230B.

[0029] Also, an outer lid plate 41A extends from the upper end of the front plate 21. The front plate 21 and the outer lid plate 41A are separated by a folding line 51A extending in the horizontal direction. Similarly, an outer lid plate 41B extends from the lower end of the front plate 21. The front plate 21 and the outer lid plate 41B are separated by a folding line 51B extending in the horizontal direction. In the assembled state of the packaging box 1, the upper lid body 6A that closes the upper opening of the packaging box 1 is formed by adhering the outer lid plate 41A overlapping the surface side of the inner lid plate 43A, and the lower lid body 6B that closes the lower opening of the packaging box 1 is formed by adhering the outer lid plate 41B overlapping the surface side of the inner lid plate 43B.

[0030] In addition, a flap 42A extends from the upper end of the side panel 22. The side panel 22 and the flap 42A are separated by a fold line 52A extending in the horizontal direction. Similarly, a flap 42B extends from the lower end of the side panel 22. The side panel 22 and the flap 42B are separated by a fold line 52B extending in the horizontal direction.

[0031] In addition, a flap 44A extends from the upper end of the side panel 24. The side panel 24 and the flap 44A are separated by a fold line 54A extending in the horizontal direction. Similarly, a flap 44B extends from the lower end of the side panel 24. The side panel 24 and the flap 44B are separated by a fold line 54B extending along the horizontal direction.

[0032] In the assembled state of the packaging box 1, the flaps 42A and 44A are located inside the upper lid 6A, preventing the upper lid 6A from sinking into the packaging box 1 and preventing a gap from occurring between the cylindrical body 11 and the upper lid 6A. Similarly, in the assembled state of the packaging box 1, the flaps 42B and 44B are located inside the lower lid 6B, preventing the lower lid 6B from sinking into the packaging box 1 and preventing a gap from occurring between the cylindrical body 11 and the lower lid 6B.

[0033] Also, paper labels 8A and 8B are respectively pasted on the surfaces of the inner cover plates 43A and 43B, that is, on the surface layers. As shown in FIG. 5, the labels 8A and 8B have, for example, a sheet-like paper material 81 made of pulp paper such as coated paper, and an adhesive 82 arranged in layers on the back surface of the paper material 81. The label 8A is pasted on the surface of the inner cover plate 43A via the adhesive 82, and the label 8B is pasted on the surface of the inner cover plate 43B via the adhesive 82. In this way, by using the adhesive 82, the paper material 81 can be easily adhered to the inner cover plates 43A and 43B.

[0034] As shown in FIG. 1, the labels 8A and 8B are smaller in area than the inner cover plates 43A and 43B in a plan view, and are attached to a part of the inner cover plates 43A and 43B, particularly to the central part in this embodiment. Therefore, the inner cover plates 43A and 43B located below them are exposed from around the labels 8A and 8B. By exposing the inner cover plates 43A and 43B from around the labels 8A and 8B in this way, as will be described later, the adhesive 9 can be applied to each of the labels 8A and 8B and the inner cover plates 43A and 43B.

[0035] Note that the thickness of the paper material 81 is not particularly limited, but for example, it is preferably about 50 μm to 100 μm, and more preferably about 70 μm to 80 μm. Thereby, the paper material 81 becomes sufficiently thin, and it is difficult for the upper lid body 6A and the lower lid body 6B to bulge or wrinkle. Therefore, it is possible to prevent a decrease in the aesthetic appearance of the packaging box 1. Also, the basis weight of the paper material 81 is not particularly limited, but for example, 2 ) to about 100 (g / m 2 ) is preferable, and about 80 (g / m 2 ) to 90 (g / m 2 ) is more preferable. Thereby, the adhesive 9 easily impregnates the paper material 81, and the adhesive strength between the inner cover plates 43A, 43B and the outer cover plates 41A, 41B can be increased.

[0036] Also, the adhesive 82 is not particularly limited, but it is preferably a material that can exhibit high adhesive strength even in a low-temperature environment (for example, an environment of 0°C or lower). Examples of such materials include acrylic adhesives and rubber adhesives. By using such a material, the adhesive strength between the labels 8A, 8B and the inner cover plates 43A, 43B can be maintained high even in a low-temperature environment.

[0037] Also, as shown in FIG. 1, when assembling the packaging box 1, the adhesive 9 is applied to the surface of the inner lid plate 43A. The adhesive 9 is applied in a line (linear) along the horizontal direction, with its central part applied on the label 8A and both end parts applied on the inner lid plate 43A respectively. That is, the adhesive 9 is applied to the surface of the paper material 81 and the surface of the inner lid plate 43A respectively. Similarly, when assembling the packaging box 1, the adhesive 9 is applied to the surface of the inner lid plate 43B. The adhesive 9 is applied in a line (linear) along the horizontal direction, with its central part applied on the label 8B and both end parts applied on the inner lid plate 43B respectively. That is, the adhesive 9 is applied to the surface of the paper material 81 and the surface of the inner lid plate 43B respectively.

[0038] Also, the adhesive 9 is not particularly limited, but in this embodiment, hot melt is used. By using hot melt, excellent adhesive strength can be exhibited. Also, the hot melt is not particularly limited, and for example, polyolefin-based hot melts mainly composed of APP (atactic polypropylene), APAO (amorphous polyalpha-olefin), ethylene-propylene copolymer, EEA (ethylene-ethyl acrylate), etc., EVA (ethylene-vinyl acetate copolymer resin)-based hot melts mainly composed of EVA, synthetic rubber-based hot melts mainly composed of styrene-based block copolymers such as SBS (styrene-butadiene copolymer), SIS (styrene-isopropylene copolymer), SEBS (styrene-ethylene-butylene copolymer), SEPS (styrene-ethylene-propylene copolymer), etc. can be used.

[0039] These can be selectively used depending on the material of the box body forming piece 10. Specifically, when the surface of the box body forming piece 10 is composed of a metal material, such as various metal vapor deposition papers like aluminum vapor deposition paper or various metal foil papers like aluminum foil paper, it is preferable to use a polyolefin-based or EVA-based hot melt. When the surface of the box body forming piece 10 is composed of a plastic material, such as plastic laminated paper, it is preferable to use a synthetic rubber-based hot melt. Thereby, high adhesive strength can be exhibited.

[0040] The configuration of the box body forming piece 10 has been described above. Next, a method of assembling the box body forming piece 10 to form the packaging box 1 will be described. In the following, for convenience of explanation, the folding method in which the front surface of the box body forming piece 10 becomes convex is also referred to as "positive folding", and conversely, the folding method in which the back surface becomes convex is also referred to as "reverse folding".

[0041] First, as shown in FIG. 6, a blank sheet is punched out to obtain the box body forming piece 10, and labels 8A and 8B are respectively attached to the surfaces of the inner lid plates 43A and 43B. In this way, by attaching the labels 8A and 8B after punching out the box body forming piece 10 from the blank sheet, the shape of the labels 8A and 8B, the attachment position of the labels 8A and 8B, etc. can be freely set as compared with the case where the labels 8A and 8B are attached before punching out the box body forming piece 10 from the blank sheet. Further, since the paper material 81 is adhered by the adhesive 82, it is inexpensive, easy to adhere, and furthermore, a high adhesive strength is exhibited together with the attachment, so that the displacement of the labels 8A and 8B at the initial stage of adhesion can be suppressed. In addition, there is no setup loss generated during the punching of the blank sheet, and there is no surplus portion of the paper material 81 (the portion to be cut and removed after attachment), so that the production cost can be reduced and the environmental load can be reduced. Furthermore, there is also an advantage that the setup loss when applying the adhesive 9 is small and the peeling of the paper material 81 hardly occurs.

[0042] Next, as shown in FIG. 7, the box body forming piece 10 is turned over, and the front panel 21 is positively folded 180° along the folding line 31, and glue B is applied to the surface of the pasting piece 20. Next, as shown in FIG. 8, the side panel 24 is positively folded 180° along the folding line 33, and the surface of the pasting piece 20 and the back surface of the side panel 24 are adhered with glue B. As a result, the box body forming piece 10 is in a folded state.

[0043] Note that the timing of attaching the labels 8A and 8B is not particularly limited, and for example, it may be after the folded state. Even if the labels 8A and 8B are attached at such a timing, the same effects as described above can be exhibited. Furthermore, there is also an advantage that the setup loss generated during pasting is eliminated.

[0044] Next, as shown in FIG. 9, in the factory where the contents are housed and packaged, the score lines 30, 31, 32, 33 are each folded at 90° in a positive fold to form a rectangular cylindrical body 11. Next, as shown in FIG. 10, an adhesive 9 is applied to the surface of the inner lid plate 43B using a gluing machine (not shown). At this time, the adhesive 9 is applied in a line shape along the horizontal direction so as to straddle (cross) the label 8B and the inner lid plate 43B, and is applied onto the paper material 81 and the inner lid plate 43B respectively. By applying the adhesive 9 in a line shape in this way, it becomes easy to apply the adhesive 9 to the inner lid plate 43B. Further, since the position where the adhesive 9 is applied is the same as the position where the adhesive is applied to a general packaging box that does not use the labels 8A, 8B, it is not necessary to use a dedicated gluing machine.

[0045] Next, the flaps 42B, 44B are folded at 90° in a positive fold along the score lines 52B, 54B, the inner lid plate 43B is folded at 90° in a positive fold along the score line 53B, and the outer lid plate 41B is folded at 90° in a positive fold along the score line 51B and overlapped on the inner lid plate 43B, thereby adhering the outer lid plate 41B and the inner lid plate 43B with the adhesive 9. Thus, as shown in FIG. 11, the lower lid body 6B is formed, and the lower opening of the cylindrical body 11 is sealed.

[0046] As shown in FIG. 12, the lower lid body 6B has three adhesive regions Q1, Q2, Q3. In the adhesive region Q1, the surface of the paper material 81 and the back surface of the outer lid plate 41B are adhered by the adhesive 9. Since the base paper is exposed on both the surface of the paper material 81 and the back surface of the outer lid plate 41B, the impregnation property of the adhesive 9 is good. Therefore, the adhesive region Q1 can exhibit high adhesive strength. Further, the adhesive region Q3 is arranged so as to overlap the adhesive region Q1. In the adhesive region Q3, the back surface of the paper material 81 and the surface of the inner lid plate 43B are adhered by the adhesive 82. Note that the hot melt, which is the adhesive 9, is applied in a melted state after being heated to about 100 to 120°C. Therefore, there is a possibility that the adhesive strength of the adhesive region Q3 may be reduced due to the heat when the hot melt is applied. Therefore, in the packaging box 1, in order to complement the possible reduction in adhesive strength in the adhesive region Q3, the adhesive regions Q2 are formed on both sides of the adhesive region Q3.

[0047] In the subsequent region Q2, the surface of the inner lid plate 43B and the back surface of the outer lid plate 41B are adhered by the adhesive 9. Since the surface layer of the surface of the inner lid plate 43B is exposed, the impregnability of the adhesive 9 is poor. Therefore, although a high adhesive strength as high as that of the adhesion region Q1 cannot be expected in the adhesion region Q2, it complements the decrease in the adhesive strength of the adhesion region Q3 and sufficiently functions to suppress the peeling of the adhesion region Q3, that is, the peeling of the paper material 81 from the inner lid plate 43B. As described above, by having the three adhesion regions Q1, Q2, and Q3, both the adhesive strength between the inner lid plate 43B and the paper material 81 and the adhesive strength between the paper material 81 and the outer lid plate 41B can be increased, and the peeling between the inner lid plate 43B and the paper material 81 and the peeling between the paper material 81 and the outer lid plate 41B can be effectively prevented. Therefore, it becomes the lower lid body 6B having high adhesive strength and excellent sealing performance capable of effectively preventing unintentional pre-opening.

[0048] In particular, in the adhesion region Q1, since both the surface of the paper material 81 and the back surface of the outer lid plate 41B are excellent in the impregnability of the adhesive 9, a high adhesive strength can be exhibited in the entire temperature range. On the other hand, in the adhesion region Q3, although a high adhesive strength can be exhibited in a low-temperature environment (for example, an environment of 0°C or lower) due to the characteristics of the acrylic adhesive used as the adhesive 82, the adhesive strength tends to decrease in a high-temperature environment (for example, an environment above 0°C). Also, in the adhesion region Q2, since only the back surface of the outer lid plate 41B is excellent in the impregnability of the adhesive 9, a high adhesive strength can be exhibited in a high-temperature environment, but the adhesive strength tends to decrease in a low-temperature environment.

[0049] That is, although it can exhibit high adhesive strength in a low-temperature environment, there is an adhesive area Q3 whose adhesive strength may decrease in a high-temperature environment. Conversely, although it can exhibit high adhesive strength in a high-temperature environment, there is an adhesive area Q2 whose adhesive strength may decrease in a low-temperature environment. By forming these, the temperature ranges in which the adhesive strength decreases can complement each other. That is, in a low-temperature environment, the decrease in the adhesive strength of the adhesive area Q2 is compensated for by the adhesive area Q3. Conversely, in a high-temperature environment, the decrease in the adhesive strength of the adhesive area Q3 can be compensated for by the adhesive area Q2. As a result, peeling between the inner lid plate 43B and the paper material 81 can be effectively prevented in all temperature ranges. Therefore, it becomes a lower lid body 6B having excellent sealing performance that can effectively prevent unintentional pre-opening. In particular, in the present embodiment, the label 8B is attached to the inner lid plate 43B by the adhesive 9 applied in a line shape across the label 8B and the inner lid plate 43B, that is, so as to cross the label 8B. The peeling of the adhesive area Q3 in a high-temperature environment can be more effectively suppressed, and the above-described effects become more remarkable.

[0050] Next, after accommodating the contents in the packaging box 1 through the upper opening of the cylindrical body 11, the upper opening of the cylindrical body 11 is sealed with the upper lid body 6A in the same manner as the lower lid body 6B. That is, as shown in FIG. 13, the adhesive 9 is applied in a line shape so as to straddle the label 8A and the inner lid plate 43A. The flaps 42A and 44A are folded forward by 90° along the folding lines 52A and 54A, the inner lid plate 43A is folded forward by 90° along the folding line 53A, and the outer lid plate 41A is folded forward by 90° along the folding line 51A and overlapped on the inner lid plate 43A, whereby the outer lid plate 41A and the inner lid plate 43A are adhered with the adhesive 9. As described above, as shown in FIG. 14, the upper lid body 6A is formed, and the upper opening of the cylindrical body 11 is sealed. Such an upper lid body 6A can also exhibit high sealing performance, similar to the lower lid body 6B.

[0051] As described above, the packaging box 1 is assembled and the packaging of the contents is completed. When taking out the contents from the packaging box 1, move the upper lid 6A while pushing in the unsealing piece 230A with a finger. As a result, the breaking line 231A breaks and the unsealing piece 230A is separated from the back plate 23, and the packaging box 1 is unsealed.

[0052] As described above, the packaging box 1 has been explained. Such a packaging box 1 is made of a material in which a metal layer or a resin layer is formed on the surface of the base paper, and includes a cylindrical body 11 having a front plate 21 (first main surface plate) and a back plate 23 (second main surface plate) arranged opposite to each other, an inner lid plate 43B extending from one end of the back plate 23, and an outer lid plate 41B extending from one end of the front plate 21 and overlapping the surface side of the inner lid plate 43B. It has a box-forming piece 10, a paper material 81 adhered to a part of the surface of the inner lid plate 43B and exposing the inner lid plate 43B from the periphery, and an adhesive 9 applied to the surface of the paper material 81 and the surface of the inner lid plate 43B respectively to adhere the inner lid plate 43B and the outer lid plate 41B. In the packaging box 1 having such a configuration, an adhesive region Q1 where the surface of the paper material 81 and the back surface of the outer lid plate 41B are adhered, an adhesive region Q3 where the back surface of the paper material 81 and the surface of the inner lid plate 43B are adhered, and an adhesive region Q2 where the back surface of the outer lid plate 41B and the surface of the inner lid plate 43B are adhered are formed. And by the adhesive region Q2 complementing the decrease in the adhesive strength of the adhesive region Q3, a high adhesive strength is exhibited, and unintentional pre-opening can be effectively prevented.

[0053] Also, as described above, the paper material 81 is adhered to the inner lid plate 43B via the adhesive 82. Thereby, the paper material 81 can be easily adhered to the inner lid plate 43B.

[0054] Also, as described above, the adhesive 9 is applied in a line shape so as to straddle the paper material 81 and the inner lid plate 43B. Thereby, the application of the adhesive 9 becomes easy.

[0055] Also, as described above, the adhesive 82 is composed of an acrylic adhesive or a rubber-based adhesive, and the adhesive 9 is composed of a polyolefin-based or EVA-based hot melt. Thereby, in the adhesion region Q3, high adhesive strength is exhibited in a low-temperature environment, and in the adhesion region Q2, high adhesive strength is exhibited in a high-temperature environment. Therefore, more effectively, the adhesion region Q2 can complement the decrease in the adhesive strength of the adhesion region Q3.

[0056] Also, as described above, the method for forming the packaging box 1 includes punching out a blank sheet made of a material having a metal layer or a resin layer formed on the surface of base paper to obtain a box body forming piece 10 including a cylindrical body 11 having a front panel 21 and a back panel 23 arranged opposite to each other, an inner lid plate 43B extending from one end of the back panel 23, and an outer lid plate 41B extending from one end of the front panel 21; adhering a paper material 81 to the surface of the inner lid plate 43B via an adhesive 82; applying an adhesive 9 to the surface of the paper material 81; and overlapping the outer lid plate 41B on the surface side of the inner lid plate 43B and adhering the inner lid plate 43B and the outer lid plate 41B with the adhesive 9. According to such a forming method, compared with the case where the paper material 81 is pasted before punching out the box body forming piece 10 from the blank sheet, the shape of the paper material 81, the pasting position of the paper material 81, etc. can be freely set. Further, since the paper material 81 is adhered by the adhesive 82, it is inexpensive and easy to adhere. Furthermore, since high adhesive strength is immediately exhibited upon pasting, displacement of the paper material 81 in the initial stage of adhesion can also be suppressed. Also, since there is no surplus portion of the paper material 81 (the portion to be cut and removed after pasting), it is possible to reduce production costs and environmental load. Furthermore, there is also an advantage that setup loss when applying the adhesive 9 and peeling of the paper material 81 are less likely to occur. Therefore, it is possible to form the packaging box 1 that is inexpensive, accurate, and has excellent sealing properties with high adhesive strength.

[0057] As described above, the packaging box 1 according to the first embodiment has been explained. However, the configuration of the packaging box 1 is not particularly limited. For example, as shown in FIG. 15, the adhesive 9 may be applied in a dot shape instead of a line shape. Further, for example, as shown in FIG. 16, a plurality of labels 8A may be arranged at intervals in the horizontal direction. Also, in the present embodiment, the paper material 81 is adhered to the inner lid plate 43A by the adhesive 82. However, the method of adhering the paper material 81 is not particularly limited. For example, it may be adhered by melting a resin layer formed on the back surface of the paper material 81 or the like. The same applies to the inner lid plate 43B side.

[0058] <Second Embodiment> The packaging box 1 according to the present embodiment is the same as the packaging box 1 of the first embodiment described above, except that the configurations of the upper lid body 6A and the lower lid body 6B are different. Therefore, in the following description, regarding the packaging box 1 of the present embodiment, the differences from the first embodiment described above will be mainly explained, and the description of the same matters will be omitted. Also, in each figure of the present embodiment, the same reference numerals are given to the same configurations as those in the above-described embodiments.

[0059] As shown in FIG. 17, in the box body forming piece 10 of the present embodiment, a lid plate 431A is extended at the upper end portion of the back plate 23. Further, the back plate 23 and the lid plate 431A are separated by a folding line 531A extending in the horizontal direction. Furthermore, an insertion piece 432A is extended at the upper end portion of the lid plate 431A. Also, the lid plate 431A and the insertion piece 432A are separated by a folding line 532A extending in the horizontal direction. In the assembled state of the packaging box 1, the insertion piece 432A is inserted into the back side of the front plate 21, and the upper opening of the cylindrical body 11 is sealed by the lid plate 431A.

[0060] Similarly, a cover plate 431B extends from the lower end of the rear panel 23. Also, the rear panel 23 and the cover plate 431B are separated by a folding line 531B extending in the lateral direction. Further, an insertion piece 432B extends from the lower end of the cover plate 431B. Also, the cover plate 431B and the insertion piece 432B are separated by a folding line 532B extending in the lateral direction. In the state where the packaging box 1 is assembled, the insertion piece 432B is inserted into the back side of the front panel 21, and the lower opening of the cylindrical body 11 is sealed by the cover plate 431B.

[0061] Further, a break line 211A is formed at the upper end of the front panel 21. The break line 211A has a U-shape that penetrates into the front panel 21 from the center of the upper end of the front panel 21. And the portion surrounded by the break line 211A of the front panel 21 becomes the opening piece 210A. Similarly, a break line 211B is formed at the lower end of the front panel 21. The break line 211B has a U-shape that penetrates into the front panel 21 from the center of the lower end of the front panel 21. And the portion surrounded by the break line 211B of the front panel 21 becomes the opening piece 210B.

[0062] In the state where the packaging box 1 is assembled, the opening piece 210A and the insertion piece 432A overlap, and they are adhered via the adhesive 9. Also, the opening piece 210B and the insertion piece 432B overlap, and they are adhered via the adhesive 9.

[0063] In the box body forming piece 10, labels 8A and 8B are further attached to the surfaces of the insertion pieces 432A and 432B, respectively. Specifically, the label 8A is attached to the region Qa that overlaps with the unsealing piece 210A when the insertion piece 432A is inserted into the back side of the front panel 21. Also, the label 8A is smaller than the unsealing piece 210A and is positioned at the center of the unsealing piece 210A when the insertion piece 432A is inserted into the back side of the front panel 21, and is attached so that its periphery is surrounded by the unsealing piece 210A. Similarly, the label 8B is attached to the region Qb that overlaps with the unsealing piece 210B when the insertion piece 432B is inserted into the back side of the front panel 21. Also, the label 8B is smaller than the unsealing piece 210B and is positioned at the center of the unsealing piece 210B when the insertion piece 432B is inserted into the back side of the front panel 21, and is attached so that its periphery is surrounded by the unsealing piece 210B.

[0064] Also, when assembling the packaging box 1, an adhesive 9 is applied to the surfaces of the insertion pieces 432A and 432B. Specifically, the adhesive 9 is applied in a line shape along the horizontal direction so as not to protrude from the region Qa and to cross the label 8A, with its central part applied on the label 8A and both ends applied on the insertion piece 432A. That is, the adhesive 9 is applied to the surfaces of the paper material 81 of the label 8A and the surface of the insertion piece 432A, respectively. Similarly, the adhesive 9 is applied in a line shape along the horizontal direction so as not to protrude from the region Qb and to cross the label 8B, with its central part applied on the label 8B and both ends applied on the insertion piece 432B. That is, the adhesive 9 is applied to the surfaces of the paper material 81 of the label 8B and the surface of the insertion piece 432B, respectively.

[0065] The configuration of the box body forming piece 10 has been described above. Next, a method of assembling the box body forming piece 10 to form the packaging box 1 will be described. Since it is the same as the first embodiment described above until the lower lid body 6B is sealed, the description will start from where the lower lid body 6B is sealed below.

[0066] First, as shown in FIG. 18, an adhesive 9 is applied to the surface of the insertion piece 432B using a pasting machine (not shown). At this time, the adhesive 9 is applied in a line shape along the horizontal direction and is applied onto the paper material 81 and the insertion piece 432B respectively. Next, the flaps 42B and 44B are folded forward at 90° along the fold lines 52B and 54B, the cover plate 431B is folded forward at 90° along the fold line 531B, and the insertion piece 432B is folded forward at 90° along the fold line 532B and inserted into the back side of the front panel 21, and the unsealing piece 210B and the insertion piece 432B are adhered with the adhesive 9. Thus, as shown in FIG. 19, the lower opening of the cylindrical body 11 is sealed. Even with such a configuration, as shown in FIG. 20, similar to the first embodiment described above, three adhesive regions Q1, Q2, and Q3 are formed on the lower lid body 6B. Therefore, the lower lid body 6B having high adhesive strength is obtained.

[0067] Next, after accommodating the contents into the packaging box 1 from the upper opening of the cylindrical body 11, the upper opening of the cylindrical body 11 is sealed with the upper lid body 6A in the same manner as the lower lid body 6B. That is, after applying the adhesive 9 to the surface of the insertion piece 432A, the flaps 42A and 44A are folded forward at 90° along the fold lines 52A and 54A, the cover plate 431A is folded forward at 90° along the fold line 531A, and the insertion piece 432A is folded forward at 90° along the fold line 532A and inserted into the back side of the front panel 21, and the unsealing piece 210A and the insertion piece 432A are adhered with the adhesive 9. Thus, as shown in FIG. 22, the upper opening of the cylindrical body 11 is sealed. Also for such an upper lid body 6A, similar to the lower lid body 6B, high adhesive strength can be exhibited.

[0068] Thus, the packaging box 1 is assembled and the packaging of the contents is completed. When taking out the contents from the packaging box 1, while pushing in the unsealing piece 210A with a finger, the cover plate 431A is lifted and moved. Thereby, the breaking line 211A is broken and the unsealing piece 210A is separated from the front panel 21, and the packaging box 1 is opened.

[0069] As described above, the packaging box 1 of the present embodiment is made of a material having a metal layer or a resin layer formed on the surface of a base paper, and includes a cylindrical body 11 having a front panel 21 (first main panel) and a back panel 23 (second main panel) arranged opposite to each other, a lid plate 431B extending from one end of the back panel 23, and an insertion piece 432B extending from one end of the lid plate 431B and inserted into the back side of the front panel 21. The packaging box 1 also has a box body forming piece 10, a paper material 81 adhered to a part of the surface of the insertion piece 432B and exposing the insertion piece 432B from the periphery, and an adhesive 9 applied to the surface of the paper material 81 and the surface of the insertion piece 432B to adhere the insertion piece 432B and the front panel 21. In the packaging box 1 having such a configuration, an adhesive region Q1 where the surface of the paper material 81 and the back surface of the front panel 21 are adhered, an adhesive region Q3 where the back surface of the paper material 81 and the surface of the insertion piece 432B are adhered, and an adhesive region Q2 where the back surface of the front panel 21 and the surface of the insertion piece 432B are adhered are formed between the insertion piece 432B and the front panel 21. By the adhesive region Q2 complementing the decrease in the adhesive strength of the adhesive region Q3, a high adhesive strength is exhibited, and unintended premature opening can be effectively prevented.

[0070] Also, as described above, the method for forming the packaging box 1 includes punching out a blank sheet made of a material having a metal layer or a resin layer formed on the surface of a base paper, and a cylindrical body 11 including a front panel 21 and a back panel 23 that are oppositely arranged, a lid plate 431B extending from one end of the back panel 23, and an insertion piece 432B extending from one end of the lid plate 431B to obtain a box body forming piece 10; a step of adhering a paper material 81 to the surface of the insertion piece 432B via an adhesive 82; a step of applying an adhesive 9 to the surface of the paper material 81; and a step of inserting the insertion piece 432B inside the front panel 21 and adhering the insertion piece 432B and the front panel 21 with the adhesive 9. According to such a forming method, compared with the case where the paper material 81 is pasted before punching out the box body forming piece 10 from the blank sheet, the shape of the paper material 81, the pasting position of the paper material 81, etc. can be freely set. Also, since the paper material 81 is adhered by the adhesive 82, it is inexpensive, easy to adhere, and further, a high adhesive strength is exhibited during pasting, so that displacement of the paper material 81 at the initial stage of adhesion can also be suppressed. Also, since there is no surplus portion (the portion to be cut and removed after pasting) of the paper material 81, it is possible to reduce production costs and environmental load. Furthermore, there is also an advantage that setup loss when applying the adhesive 9 and peeling of the paper material 81 are less likely to occur. Therefore, it is possible to form the packaging box 1 that is inexpensive, accurate, has a high adhesive strength, and excellent sealing properties.

[0071] Also according to the second embodiment as described above, the same effects as those of the first embodiment described above can be exhibited.

[0072] <Third Embodiment> The packaging box 1 according to this embodiment is the same as the packaging box 1 of the first embodiment described above, except that the configurations of the upper lid body 6A and the lower lid body 6B are different. Therefore, in the following description, regarding the packaging box 1 of this embodiment, the differences from the first embodiment described above will be mainly described, and the description of the same matters will be omitted. Also, in each figure of this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals. Since the upper lid body 6A and the lower lid body 6B have the same configuration as each other, in the following, the upper lid body 6A will be described as a representative, and the description of the lower lid body 6B will be omitted.

[0073] As shown in FIG. 23, in the box body forming piece 10 of this embodiment, the adhesive 9 is applied on the paper material 81. Also, different from the first embodiment described above, the adhesive 9 does not protrude from the paper material 81 and is not applied on the inner lid plates 43A and 43B.

[0074] Also by such a third embodiment, the same effects as those of the first embodiment described above, particularly the effects regarding the manufacturing method, can be exhibited.

[0075] <Fourth Embodiment> The packaging box 1 according to this embodiment is the same as the packaging box 1 of the second embodiment described above, except that the configurations of the upper lid body 6A and the lower lid body 6B are different. Therefore, in the following description, regarding the packaging box 1 of this embodiment, the differences from the first embodiment described above will be mainly described, and the description of the same matters will be omitted. Also, in each figure of this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals. Since the upper lid body 6A and the lower lid body 6B have the same configuration as each other, in the following, the upper lid body 6A will be described as a representative, and the description of the lower lid body 6B will be omitted.

[0076] As shown in FIG. 24, in the box body forming piece 10 of this embodiment, the adhesive 9 is applied on the paper material 81. Also, different from the first embodiment described above, the adhesive 9 does not protrude from the paper material 81 and is not applied on the insertion pieces 432A and 432B.

[0077] Even with such a fourth embodiment, it is possible to achieve the same effects as those of the first embodiment described above, particularly the effects regarding the manufacturing method.

[0078] As described above, the packaging box and the method for forming the packaging box of the present invention have been described based on the illustrated embodiments. However, the present invention is not limited to the above-described embodiments. For example, in the above-described embodiments, the first main panel is the front panel and the second main panel is the back panel. However, the orientation of the packaging box 1, that is, which panel constitutes the front panel, is not particularly limited. That is, any of the front panel 21, side panels 22, back panel 23, and side panel 24 may be the first main panel.

Explanation of Reference Numerals

[0079] 1... Packaging box, 10... Box body forming piece, 11... Cylindrical body, 20... Adhesive piece, 21... Front panel, 210A... Opening piece, 210B... Opening piece, 211A... Breaking line, 211B... Breaking line, 22... Side panel, 23... Back panel, 230A... Opening piece, 230B... Opening piece, 231A... Breaking line, 231B... Breaking line, 24... Side panel, 30... Scoring line, 31... Scoring line, 32... Scoring line, 33... Scoring line, 41A... Outer cover plate, 41B... Outer cover plate, 42A... Flap, 42B... Flap, 43A... Inner cover plate, 43B... Inner cover plate, 431A... Cover plate, 431B... Cover plate, 432A... Insertion piece, 432B... Insertion piece, 44A... Flap, 44B... Flap, 51A... Scoring line, 51B... Scoring line, 52A... Scoring line, 52B... Scoring line, 53A... Scoring line, 531A... Scoring line, 531B... Scoring line, 532A... Scoring line, 532B... Scoring line, 53B... Scoring line, 54A... Scoring line, 54B... Scoring line, 6A... Upper cover body, 6B... Lower cover body, 8A... Label, 8B... Label, 81... Paper material, 82... Adhesive, 9... Adhesive, B... Paste, Q1... Adhesive area, Q2... Adhesive area, Q3... Adhesive area, Qa... Area, Qb... Area

Claims

1. It is made of a material with a metal layer or a resin layer formed on the surface of the base paper, and includes a cylindrical body having first and second main panels arranged opposite to each other, an inner lid plate extending from one end of the second main panel, and an outer lid plate extending from one end of the first main panel and overlapping the surface side of the inner lid plate. A paper material adhered to a part of the surface of the inner lid plate and having the inner lid plate exposed from the periphery. An adhesive applied to each of the surface of the paper material and the surface of the inner lid plate for adhering the inner lid plate and the outer lid plate. The packaging box is characterized by having these.

2. The packaging box according to claim 1, wherein the paper material is adhered to the inner lid plate via an adhesive.

3. The packaging box according to claim 1, wherein the adhesive is applied in a line shape so as to straddle the paper material and the inner lid plate.

4. It is made of a material with a metal layer or a resin layer formed on the surface of the base paper, and includes a cylindrical body having first and second main panels arranged opposite to each other, a lid plate extending from one end of the second main panel, and an insertion piece extending from one end of the lid plate and inserted into the back side of the first main panel. A paper material adhered to a part of the surface of the insertion piece and having the insertion piece exposed from the periphery. An adhesive applied to each of the surface of the paper material and the surface of the insertion piece for adhering the insertion piece and the first main panel. The packaging box is characterized by having these.

5. The packaging box according to claim 4, wherein the paper material is adhered to the insertion piece via an adhesive.

6. The packaging box according to claim 4, wherein the adhesive is applied in a line shape so as to straddle the paper material and the insertion piece.

7. The adhesive is composed of an acrylic adhesive or a rubber adhesive. The packaging box according to claim 2 or 5, wherein the adhesive is composed of a polyolefin-based or EVA-based hot melt.

8. A step of punching out a blank sheet made of a material having a metal layer or a resin layer formed on the surface of a base paper to obtain a box body forming piece having a cylindrical body provided with a first main panel and a second main panel arranged opposite to each other, an inner lid plate extending from one end of the second main panel, and an outer lid plate extending from one end of the first main panel; A step of adhering a paper material to the surface of the inner lid plate via an adhesive; A step of applying an adhesive to the surface of the paper material; A method for forming a packaging box, comprising a step of overlapping the outer lid plate on the surface side of the inner lid plate and adhering the inner lid plate and the outer lid plate with the adhesive.

9. A step of punching out a blank sheet made of a material having a metal layer or a resin layer formed on the surface of a base paper to obtain a box body forming piece having a cylindrical body provided with a first main panel and a second main panel arranged opposite to each other, a lid plate extending from one end of the second main panel, and an insertion piece extending from one end of the lid plate; A step of adhering a paper material to the surface of the insertion piece via an adhesive; A step of applying an adhesive to the surface of the paper material; A method for forming a packaging box, comprising a step of inserting the insertion piece into the back surface side of the first main panel and adhering the insertion piece and the first main panel with the adhesive.

Images