JP2010018325A - Corrugated fiberboard box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a cardboard box reusable easily.
A corrugated cardboard box 10 in which overlapping joining pieces 21 and 22 are provided on side walls 11 and 12 and a front surface of one joining piece 21 and a back surface of the other joining piece 22 are bonded together with an adhesive 40 is provided. The protective sheets 31 and 32 are provided in the region including at least the adhesion planned region on each of the front surface of the one bonding piece 21 and the back surface of the other bonding piece 22.
[Selection] Figure 1

Description

  The present invention relates to a cardboard box.

  As a cardboard box, it has an inner flap that is connected to the left and right side walls and an outer flap that is connected to the front and rear side walls, and the front surface of the inner flap and the back surface of the outer flap are bonded via an adhesive during packing. There is. In such a cardboard box, when the adhesion between the inner flap and the outer flap is peeled off for opening, the front surface of the inner flap and the back surface of the outer flap are peeled off and become damaged and cannot be reused.

In order to reuse the cardboard box described in Patent Document 1, when packing the cardboard box, the inner flap and the outer flap are simply overlapped and closed without being bonded, and the entire box is covered with a plastic film. When the cardboard box is reused, it can be reused like a new one by replacing the film.
JP2006-103786

  In the corrugated cardboard box described in Patent Document 1, a large amount of film is required to cover the entire cardboard box with a film, and there is a disadvantage that the automatic mechanization is difficult.

  An object of the present invention is to enable a cardboard box to be easily reused. Further, when the cardboard box is reused, it is possible to use the cardboard box automatic assembly machine and the automatic sealing machine with a minimum of modifications.

  The invention according to claim 1 is a corrugated cardboard box in which joining pieces that overlap each other are provided on the side wall, and the front surface of one joining piece and the back surface of the other joining piece are bonded via an adhesive. A protective sheet made of a plastic film is provided in a region including at least an adhesion planned region on each of the front surface and the back surface of the other joining piece.

Example 1 (FIG. 1)
FIG. 1 shows a cardboard box 10. This cardboard box 10 is repeatedly used as a returnable box, but even if it is used only once, it is to be closed again after being opened temporarily for the purpose of putting a warranty card during the use, etc. Also good.

  The cardboard box 10 is an A-type cardboard box, and outer flaps 22A and 22A as inner pieces 21 and 22 and inner flaps 21A and 21A are connected to the upper and lower ends of the left and right side walls and the front and rear side walls, respectively. The top and bottom openings are closed by the flaps 22A and 22A and the inner flaps 21A and 21A. Hereinafter, the configuration on the top surface side of the cardboard box 10 will be described, and the configuration on the bottom surface side is the same as that on the top surface side, and the description thereof will be omitted. However, the cardboard box 10 of the present invention may be of the A type having the above-described outer flaps 22A and 22A and inner flaps 21A and 21A only for the top surface, and may adopt a special assembly structure for the bottom surface.

  The cardboard box 10 has left and right inner flaps 21 </ b> A and 21 </ b> A, which are one of the joining pieces 21 and 22 that overlap each other, connected to the upper ends of the narrow left and right side walls 11 and 11, and the other joining piece 22. The front and rear outer flaps 22A and 22A are connected to the upper ends of the wide front and rear side walls 12 and 12, respectively.

  Corrugated cardboard is a product in which a liner is bonded to one or both sides of a core base paper formed into a corrugated shape. However, a box made of a simple plate-like foaming resin whose material is not the above-mentioned cardboard is also a plastic cardboard. This plastic cardboard box is also included in the cardboard box of the present invention.

  The corrugated cardboard box 10 is coated with at least a bonding area A (adhesive 40 described later) on each of the front surface of the inner flap 21A, which is one joining piece 21, and the back surface of the outer flap 22A, which is the other joining piece 22. The protective sheets 31 and 32 are attached in advance to the area including the area to be covered) before the adhesive 40 is applied. The protective sheet 31 may be provided so as to cover the entire surface of the inner flap 21A, and the protective sheet 32 may be provided so as to cover the entire back surface of the outer flap 22A.

  The corrugated cardboard box 10 has an adhesive 40 in which the front surface of the inner flap 21A and the back surface of the outer flap 22A are applied to the protective sheet 31 on the front surface of the inner flap 21A (or the protective sheet 32 on the back surface of the outer flap 22A). Glued. The adhesive 40 adheres to the protective sheet 31 on the front surface of the inner flap 21A and the protective sheet 32 on the rear surface of the outer flap 22A, and bonds the front surface of the inner flap 21A and the rear surface of the outer flap 22A.

  The materials used for the protective sheets 31 and 32 are preferably those that do not change in quality due to the chemical action or thermal action of the adhesive, and those that can be reduced to a minimum.

  As the protective sheets 31 and 32, a plastic film is preferable, and an OPP (orientated polypropylene) adhesive tape is particularly preferable. Further, an adhesive tape such as vinyl chloride resin, olefin resin, or fluorine resin may be used. As the protective sheets 31, 32, a film material coated with an adhesive can be substituted, and the film material is a plastic film such as PP (polypropylene), PE (polyethylene), NY (nylon) / PE, co-pressed film, foam There are no particular restrictions on the film, recycled film, biodegradable film, stretched / unstretched film, and the like. Further, a laminate of a plurality of these materials may be used.

  As the protective sheets 31 and 32, a metal film coated with an adhesive may be used. In this case, an aluminum adhesive tape or a stainless adhesive tape is particularly preferable. As the protective sheets 31, 32, a metal film material coated with an adhesive can be used, and the metal film agent is not particularly limited, such as an iron material such as an aluminum material, a copper material, and stainless steel. A plastic film may be laminated on the surface of the metal film.

  The protective sheets 31 and 32 may be paper adhesive tapes. In particular, kraft adhesive tape is preferable, and gummed tape may be used. The gum tape referred to here is a tape obtained by applying a water-soluble paste material to kraft paper and drying it, and in use, refers to a tape which supplies moisture to activate the paste portion. The protective sheets 31 and 32 may be paper-based materials coated with an adhesive material.

  The protective sheets 31 and 32 may be cloth adhesive tapes. A cloth adhesive tape is particularly preferable. The material of the cloth portion is not particularly limited, such as synthetic fiber such as sufumos, plastic such as acrylic, glass cloth, and the like. The protective sheets 31 and 32 may be ones made by applying an adhesive to a cloth material.

  As the protective sheets 31 and 32, rubber adhesive tape is preferable. The material of the rubber part is not particularly limited, such as urethane rubber or silicone rubber. As the protective sheets 31 and 32, those obtained by applying an adhesive to a rubber sheet material can also be used.

  Here, it is preferable that the protective sheets 31 and 32 have an adhesive strength that is not too strong. This is for minimizing the damage to the surface of the cardboard box 10 and for reducing the labor when the protective tape is peeled off when the protective sheet needs to be replaced.

  As the adhesive 40, a solid adhesive is preferable from the viewpoint of reuse. In other words, solid adhesives do not lose their tackiness even at room temperature when the cardboard box is reused, that is, when the cardboard box is assembled, so that it can be reused as it is, including the adhesive. This is because it eliminates the need for melting. As the solid adhesive, a hot melt adhesive is preferable, and an acrylic adhesive, a rubber adhesive, or the like may be used.

  As the adhesive 40, “(I) component: block copolymer, (II) component: tackifier and (III) component: hot melt adhesive comprising a plasticizer, (I) component: The block copolymer has a styrene content of 35 to 50% by weight, a styrene-butadiene diblock content of 50 to 80% by weight, and a viscosity of 15% by weight toluene solution at 25 ° C. of 20 to 40 mPa · s ( A) 30% by weight or more of styrene-butadiene-styrene block copolymer, and (I) component is 17 to 30% by weight with respect to the sum of components (I), (II), and (III) “Hot melt adhesive included” (see JP-A-2004-137297) can be employed.

  Further, as the adhesive 40, “(A) a thermoplastic block copolymer that is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound; and (B) a carboxylic acid and / or a carboxylic acid anhydride. And (A) a thermoplastic block copolymer comprising a styrene-isoprene block copolymer (SIS), a styrene-butadiene block copolymer (SBS), and a hydrogenated styrene. -At least one selected from isoprene block copolymer (SEPS) and hydrogenated styrene-butadiene block copolymer (SEBS), and (B) wax modified with carboxylic acid and / or carboxylic anhydride is maleic acid And / or polyolefin wax modified with maleic anhydride ”(JP 2007-169531 A) Irradiation) can be adopted.

  Further, as the adhesive 40, it is also possible to use a semi-solid adhesive, a reactive adhesive, a solution adhesive, a water dispersion adhesive, or the like. What is necessary is just to apply | coat again about the adhesive agent which adhesiveness loses at room temperature at the time of reuse of a cardboard box. A double-sided adhesive tape may be used as the adhesive 40.

  As described above, the bottom of the cardboard box 10 can be of a special assembly structure. For example, a combination of a plurality of bottom components connected to the lower ends of the side walls 11 and 12 is used. Yes (FIGS. 3 and 4).

  The assembled bottom 50 of FIG. 3 is connected to the bottom connecting piece 52 connected to the blank bottom plate constituting piece 51 by gluing to the adjacent bottom constituting piece 51A, and the blank is expanded in a box shape (see FIG. 3 (A)). The bottom component piece is expanded to become a bottom wall. In the industry, it is called a bottom one-touch box.

  The assembled bottom 60 of FIG. 4 uses a pair of vertical and horizontal flap-shaped bottom plate constituting pieces that form a bottom wall, and firstly bends inward the first bottom plate constituting piece 61 having a recess 61A formed at the tip in the vertical direction (FIG. 4). (See (A)), then, the second and third bottom plate constituting pieces 62 in the left-right direction are stacked on the first bottom plate constituting piece 61 to form a slit S (see FIG. 4B), and finally in the vertical direction. When the fourth bottom plate constituting piece 63 having the protrusion 63A formed at the tip is overlaid and the tip is pushed in (see FIGS. 4C and 4D), the protrusion becomes the first to third bottom plate structures. It is configured to be locked by being pushed into a groove formed by a piece. In the industry, it is called B type, Jigoku bottom, hell bottom, American rock, etc.

According to the present embodiment, the following operational effects can be obtained.
(a) The corrugated cardboard box 10 is provided with the protective sheets 31 and 32 in the bonding scheduled areas A of the overlapping joining pieces 21 and 22, respectively, and then the surface of one adhesive piece 21 and the back surface of the other adhesive piece 22. Are bonded by an adhesive 40. When the adhesive is peeled off for opening, the adhesive 40 is peeled off from the protective sheets 31 and 32, and the surface of the cardboard box 10 is removed without peeling off the surface of one joining piece 21 and the back surface of the other joining piece 22. The cardboard box 10 can be reused.

  (b) In the A-type corrugated cardboard box 10, the inner flap 21A and the outer flap 22A are the above-described joining pieces 21 and 22, respectively, and the above-described (a) can be realized.

  (c) As the adhesive 40, “(I) component: block copolymer, (II) component: tackifier and (III) component: hot melt adhesive comprising a plasticizer, (I) Component: The block copolymer has a styrene content of 35 to 50% by weight, a styrene-butadiene diblock content of 50 to 80% by weight, and a 15% by weight viscosity of a toluene solution at 25 ° C. of 20 to 40 mPa · s. A certain (A) styrene-butadiene-styrene block copolymer is contained in an amount of 30% by weight or more, and the total of (I), (II), and (III) is 17-30. "Hot melt adhesive contained by weight%", "(A) a thermoplastic block copolymer which is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound, and (B) a carboxylic acid and / or a carboxylic anhydride. A hot-melt adhesive containing a wax modified with a product, (A) Thermoplastic block copolymers include styrene-isoprene block copolymer (SIS), styrene-butadiene block copolymer (SBS), hydrogenated styrene-isoprene block copolymer (SEPS) and hydrogenated styrene-butadiene block copolymer (SEBS). And (B) the wax modified with carboxylic acid and / or carboxylic anhydride is a polyolefin wax modified with maleic acid and / or maleic anhydride ”. It is possible to use an adhesive that softens at a low temperature. For this reason, the temperature which can apply | coat the adhesive agent 40 is low, and the protection sheets 31 and 32 to which the adhesive agent 40 is applied are not damaged. Moreover, it has adhesiveness also at room temperature. The adhesive 40 is not completely solidified and peeled off at the time of opening, and can be reused as it is if the adhesive 40 is not removed after opening. Further, when the cardboard box is reused, the protective sheets 31 and 32 may be peeled off as needed, and the new protective sheets 31 and 32 may be reapplied for use.

  (d) The bottom of the cardboard box 10 may be formed by the assembled bottom 50 or 60.

(Example 2)
The cardboard box 110 of FIG. 2 is a wrap round type cardboard box, and the left side wall 111A, the front side wall 112A, the right side wall 111B, and the rear side wall 112B are connected in order, and the contents 1 is inserted on the front side wall 112A, for example. Then, these side walls 111A-112B are wound and the contents 1 are wrapped. At this time, the end 113A of the left side wall 111A at one end and the joint flap 114A connected to the end of the rear side wall 112B at the other end are joined to each other as joining pieces 113, 114, and joined to the surface of the joining piece 113. The back surface of the piece 114 is adhered by an adhesive 115 (not shown) to form a box body portion that wraps the contents 1.

  Here, the corrugated cardboard box 110 has at least a bonding area A (adhesive 115) on each of the surface of the end 113A of the left side wall 111A as one joining piece 113 and the back surface of the joint flap 114A as the other joining piece 114. The protective sheets 116 and 117 made of a plastic film are attached in advance to the area including the area where the adhesive 115 is to be applied, before the adhesive 115 is applied.

  Thereby, the corrugated cardboard box 110 has a protective sheet 116 on the surface of the end 113A of the left side wall 111A as one joining piece 113 and the back surface of the joint flap 114A as the other joining piece 114, for example. It is bonded via the adhesive 115 applied to the protective sheet 117 on the back surface of the joint flap 114A. The adhesive 115 adheres to the protective sheet 116 on the surface of the end 113A and the protective sheet 117 on the back of the joint flap 114A, and bonds the surface of the end 113A and the back of the joint flap 114A.

  Further, regarding the configuration of the top and bottom surfaces of the cardboard box 110, the above-mentioned cardboard box 10 (the side walls 11, 12, the inner flap 21A, the outer flap 22A, the joining pieces 21, 22, the protective sheets 31, 32, the adhesive 40) The left and right inner flaps 121A and 121A are connected to the upper and lower ends of the left and right side walls 111A and 111B, and the front and rear outer flaps 122A and 122A are connected to the upper and lower ends of the front and rear side walls 112A and 112B. The inner flaps 121A and 121A are used as one joining piece 121, and the front and rear outer flaps 122A and 122A are used as the other joining piece 122. And at least the adhesion plan area | region A (area | region where the adhesive agent 140 mentioned later is planned) in each of the surface of the inner flap 121A as one joining piece 121 and the back surface of the outer flap 122A as the other joining piece 122 Before the application of the adhesive 140, protective sheets 131 and 132 made of a plastic film are attached in advance to the regions including.

  Thereby, the corrugated cardboard box 110 has a protective sheet 131 (outer flap 122A) on the surface of the inner flap 121A, for example, with the surface of the inner flap 121A as the one joining piece 121 and the back surface of the outer flap 122A as the other joining piece 122. The protective sheet 132 on the back surface of the adhesive is also possible). The adhesive 140 adheres to the protective sheet 131 on the front surface of the inner flap 121A and the protective sheet 132 on the rear surface of the outer flap 122A, and bonds the front surface of the inner flap 121A and the rear surface of the outer flap 122A.

  In the present embodiment, the surface of the end portion 113A of the left side wall 111A as one joining piece 113 and the back surface of the joint flap 114A as the other joining piece 114 are bonded first, but as the one joining piece 121 first, The front surface of the inner flap 121A and the back surface of the outer flap 122A as the other joining piece 122 may be adhered.

  In the cardboard box 110, the protective sheets 116, 117, 131, and 132 can be the same as the protective sheets 31 and 32 of the first embodiment. The adhesives 115 and 140 can be the same as the adhesive 40 of the first embodiment. Further, as the configuration of the bottom portion of the cardboard box 110, the assembled bottom shown in FIGS. 3 and 4 may be adopted.

FIG. 1 is a perspective view showing a cardboard box according to the first embodiment. FIG. 2 is a perspective view showing a cardboard box according to the second embodiment. FIG. 3 is a schematic diagram showing an example of the assembled bottom. FIG. 4 is a schematic diagram showing another example of the assembled bottom.

Explanation of symbols

10 Cardboard box 11 Left and right side walls 12 Front and rear side walls 21, 22 Joint piece 21A Inner flap 22A Outer flap 31, 32 Protective sheet 40 Adhesive 50, 60 Assembly bottom 110 Cardboard box 111A, 111B, 112A, 112B Side wall 113, 114 Joint piece 113A End 114A Joint flap 115 Adhesive 116, 117 Protective sheet 121, 122 Joint piece 121A Inner flap 122A Outer flap 131, 132 Protective sheet 140 Adhesive

Claims (7)

A cardboard box in which a bonding piece for closing the opening on the top surface or the bottom surface is provided on the side wall, and the surface of one bonding piece and the back surface of the other bonding piece are bonded via an adhesive,
A cardboard box in which a protective sheet is provided in an area including at least an adhesion planned area on each of the front surface of one joining piece and the back surface of the other joining piece.   2. The cardboard box according to claim 1, wherein the cardboard box is an A-type cardboard box in which an inner flap connected to the left and right side walls and an outer flap connected to the front and rear side walls are used as the joining pieces.   The corrugated cardboard box is formed by winding a plurality of side walls arranged in order, and each of the joint flaps connected to the end portion of the side wall at one end and the end portion of the side wall at the other end serves as the joining piece. The cardboard box according to claim 1, which is a cardboard box. The cardboard box according to any one of claims 1 to 3, wherein the adhesive is a solid adhesive. The adhesive is a hot melt adhesive comprising (I) component: block copolymer, (II) component: tackifier and (III) component: plasticizer,
Component (I): The block copolymer has a styrene content of 35 to 50% by weight, a styrene-butadiene diblock content of 50 to 80% by weight, and a 15% by weight viscosity of a toluene solution at 25 ° C. of 20 to 40 mPa. S (A) comprising 30% by weight or more of a styrene-butadiene-styrene block copolymer,
The cardboard box according to any one of claims 1 to 4, which is a hot melt adhesive containing 17 to 30% by weight of the component (I) with respect to the sum of the components (I), (II), and (III). . The adhesive comprises (A) a thermoplastic block copolymer which is a copolymer of a vinyl aromatic hydrocarbon and a conjugated diene compound, and (B) a wax modified with a carboxylic acid and / or a carboxylic anhydride. And a hot melt adhesive containing
(A) The thermoplastic block copolymer comprises a styrene-isoprene block copolymer (SIS), a styrene-butadiene block copolymer (SBS), a hydrogenated styrene-isoprene block copolymer (SEPS), and a hydrogenated styrene-butadiene block. At least one selected from copolymers (SEBS),
The cardboard box according to any one of claims 1 to 4, wherein the wax modified with (B) carboxylic acid and / or carboxylic anhydride is a polyolefin wax modified with maleic acid and / or maleic anhydride.   The cardboard box according to any one of claims 1 to 6, wherein a bottom portion of the cardboard box is formed by an assembled bottom in which a plurality of bottom constituent pieces connected to a side wall are combined.

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