TWI659907B - Packaging container and its disassembly method - Google Patents

Abstract

Provided is a packaging container with simple structure and easy disassembly and a disassembly method thereof.

The packaging container is formed by bending a sheet material, and includes a container body having a trunk portion as a side surface and a top portion and a bottom portion connected to the ends thereof, and the container body forms a linear first weakened portion.

Description

Packaging container and its disassembly method

The present invention relates to a packaging container and a method for disassembling it.

A barrier layer such as an aluminum foil, an aluminum vapor-deposited film, or an inorganic oxide vapor-deposited film is laminated between a paper substrate layer and a sealing layer made of a thermoplastic resin, and has been described in Patent Document 1 Packaging containers that are bent into a box shape and closed by overlapping the ends are well known.

This type of packaging container comes in various forms. One of them is a package in which a gable top (gable top) box top plate is provided with an injection hole plug made of polyethylene or the like to allow the contents to flow out. Containers are known. In the case of such a packaging container, the top seal of the box is opened for the purpose of separating the container body made of paper sheet and the injection hole plug when discarding it. Then, use scissors to cut around the injection hole plug to separate the injection hole plug from the packaging container. In addition, even a packaging container without an ejection hole plug, the container body is disassembled for the purpose of waste reduction when discarded.

Patent Document 2 discloses a paper container for liquid packaging, in which a peelable pull tab is provided on a side seal of a container body that is closed by overlapping the two ends of a paper substrate plate with each other, and Pull The sheet is provided in a peelable state through a peeling layer formed of an easily peelable tape film. According to the liquid packaging paper container, if the side sealing part is peeled off by pulling the pull tab strongly, or if the side panel is cracked by pulling the pull tab provided on the side panel, the liquid packaging can be easily started from this Disassemble with a paper container body.

The paper packaging system disclosed in Patent Document 3 is equipped with a spout having a weakened portion formed on a paper container formed with a bending guide line. If the paper packaging body is bent along the bending guide line, the weakened part of the liquid discharge nozzle can be cracked, thereby separating the liquid discharge nozzle from the paper container.

Prior art literature Patent literature

Patent Document 1 JP 2003-335362

Patent Document 2 Japanese Patent No. 3843510

Patent Document 3 Japanese Patent No. 5649421

However, in the liquid packaging paper container of Patent Document 2, it is necessary to use an easily peelable tape film, and the sealability of the trunk portion bonding portion may be unstable due to the easily peelable tape film. On the other hand, in the method described in Patent Document 3, although the injection hole plug can be removed, the paper container body cannot be disassembled.

The present invention has been developed in view of the above-mentioned problems, and an object thereof is to provide a packaging container capable of stably disassembling with a simple structure and a disassembling method thereof.

In order to solve the above problem, one aspect of the present invention is a packaging container, which is formed by bending a sheet and includes a container body having a trunk portion as a side surface and a top portion connected to each end portion thereof. And the bottom, and form a linear first weakened portion.

Furthermore, another aspect of the present invention is the method for disassembling the packaging container, including: a step of flattening a trunk portion and a top portion of the packaging container; a step of bending the packaging container along the aforementioned weakening portion; A step of folding the packaging container along a linear first weakened portion formed in the container body to form at least a partial crack; and a step of separating the packaging container along the cracked portion of the first weakened portion.

According to the present invention, it is possible to provide a packaging container capable of simply constructing a stable disassembly and a disassembly method thereof.

1, 2, 3‧‧‧ packaging containers

10, 11, 12, 13, 14‧‧‧ vegetarian plate

100‧‧‧ container body

101‧‧‧Top

102‧‧‧Torso

103‧‧‧ bottom

104‧‧‧Injection hole plug

104a‧‧‧outlet

104b‧‧‧ Cover

105‧‧‧ weakened

105a‧‧‧The first weakened part

105b‧‧‧The second weakened part

105c‧‧‧The third weakened part

106‧‧‧Box top plate

107‧‧‧ folding board

108‧‧‧Return Folding Plate

109‧‧‧Side panel

110‧‧‧ bottom panel

111‧‧‧sealing department

112‧‧‧ injection hole

113‧‧‧ Disconnect start

20‧‧‧ Sheet

21‧‧‧ thermoplastic resin layer

22‧‧‧paper substrate layer

23‧‧‧Adhesive resin layer

24‧‧‧ barrier layer

24a‧‧‧ substrate film

24b‧‧‧Evaporation coating

24c‧‧‧metal foil

25‧‧‧ Adhesive layer

26‧‧‧Sealing layer

27a, 27b‧‧‧‧Incision processing department

28‧‧‧print layer

301‧‧‧ sidewall

302‧‧‧burst

303‧‧‧next door

304‧‧‧Gripping ring

305‧‧‧male thread

306‧‧‧Thin-walled

FIG. 1 is a perspective view of a packaging container according to a first embodiment of the present invention.

Fig. 2 is a plain plate view of the packaging container according to the first embodiment of the present invention.

3A is a cross-sectional view of an example of a sheet according to the first embodiment of the present invention.

3B is a cross-sectional view of another example of a sheet according to the first embodiment of the present invention.

Fig. 4A is a diagram showing a method for disassembling a packaging container according to the first embodiment of the present invention.

FIG. 4B is a view showing a method for disassembling the packaging container according to the first embodiment of the present invention.

Fig. 4C is a view showing a method for disassembling the packaging container according to the first embodiment of the present invention.

Fig. 5 is a plain plate view of a packaging container according to a second embodiment of the present invention.

Fig. 6A is a diagram showing a method for disassembling a packaging container according to a second embodiment of the present invention.

Fig. 6B is a view showing a method for disassembling a packaging container according to a second embodiment of the present invention.

Fig. 7 is a perspective view of a packaging container according to a third embodiment of the present invention.

8 is a plan view of a plain plate according to a third embodiment of the present invention.

9A is a plan view of a modified example of a plain plate according to a third embodiment of the present invention.

9B is a plan view of a modified example of a plain plate according to a third embodiment of the present invention.

Fig. 10A is a sectional view of a liquid discharge nozzle according to an embodiment of the present invention.

Fig. 10B is a cross-sectional view of a liquid discharge nozzle according to an embodiment of the present invention.

Fig. 10C is a cross-sectional view of a liquid discharge nozzle according to an embodiment of the present invention.

FIG. 11A is a diagram showing a method for disassembling a packaging container according to an embodiment of the present invention. FIG.

FIG. 11B is a diagram of a method for disassembling a packaging container according to an embodiment of the present invention.

FIG. 12A is a diagram of a method for disassembling a packaging container according to an embodiment of the present invention.

FIG. 12B is a diagram of a method for disassembling a packaging container according to an embodiment of the present invention.

Embodiment of the invention (First Embodiment)

FIG. 1 is a perspective view of a packaging container 1 according to a first embodiment of the present invention. The packaging container 1 is formed by folding a plain plate into a box shape, and by overlapping and closing the ends. The packaging container 1 includes a top portion 101, a torso portion 102, and a bottom portion 103. The top portion 101 is composed of two box top plates 106. One side of the box top plate 106 is provided with an injection hole plug 104, and the injection hole plug 104 includes a supply hole plug 104. A liquid discharge nozzle from which the liquid in the packaging container 1 flows out, and a lid for closing the liquid discharge nozzle. A linear weakened portion 105 is formed over the entire circumference of the trunk portion 102. When the packaging container 1 is flattened, the weakened portion 105 is located at an overlapping position when viewed from above.

FIG. 2 shows a plain plate 10 as a material of the packaging container 1. The packaging container 1 includes a box top plate 106 constituting the top portion 101, a side panel 109 constituting the trunk portion 102, and a bottom panel 110 constituting the bottom portion 103. The plain plate 10 has a sealing portion 111 at one end. The plain plate 10 is bent along the one-point chain line in FIG. 2 and the sealing portion 111 is closed at the other end, so that the plain plate 10 can be formed into a box shape. One of the box top plates 106 is formed with an injection hole 112 through which the liquid nozzle is inserted and fixed. In one example, a line-shaped weakened portion 105 is formed in the vicinity of a portion that is in contact with the top portion 101 of the side panel 109 in a direction that becomes the width direction of the trunk portion 102 (left-right direction on the paper surface in FIG. 2).

3A and 3B are cross-sectional views schematically showing examples of the structure of each layer of the sheet material 20 used as the plain sheet material 10. Sheet 20 from the packaging The container 1 has, in order from the outside to the inside, a printing layer 28 / thermoplastic resin layer 21 / paper base material layer 22 / adhesive resin layer 23 / barrier layer 24 / adhesive layer 25 / sealing layer 26. The difference between the example shown in FIG. 3A and the example shown in FIG. 3B will be described later.

As shown in FIGS. 3A and 3B, the weakened portion 105 of the sheet material 20 is formed of groove-shaped cutout portions 27 a and 27 b formed at least in the paper base material layer 22 and the barrier layer 24 with a predetermined depth. At this time, the cut-out processing portion 27 b of the barrier layer 24 is formed at a position overlapping the cut-out processing portion 27 a of the paper base material layer 22. At this time, it is preferable that the notch processing portion is provided at a depth that does not penetrate the barrier layer 24. However, since the barrier property is not affected even if it penetrates in a local narrow area, there is no problem in penetrating the local barrier layer. In addition, the notch processing portion 27 a may be formed at least on the paper base material layer 22, and therefore, as shown in FIGS. 3A and 3B, the thermoplastic resin formed on the paper base material layer 22 and laminated on the outside of the paper base material layer 22 is also formed. Layer 21 and printed layer 28.

The formation depth of the notch processing portion 27 a is based on the principle that the paper base material layer 22 can secure the strength of the packaging container 1. The method of forming the notch processing portion 27a includes a half-removal process or a full-removal process using a die. When formed by the full removal process, in order to ensure the strength of the packaging container 1, a riding stitch shape may be formed. The notch processing portion 27b can be formed by laser light processing after the barrier layer is bonded, but when formed before the barrier layer is bonded, the knife mold can be used for semi-removal processing and full-removal processing. Even when the notch processing portion 27b is provided before the barrier layer is bonded, it can be formed by laser processing. The notch processing portion 27b may be formed in a saddle shape to ensure strength.

The thermoplastic resin layer 21 may be a low-density polyethylene resin (LDPE), a linear low-density polyethylene resin (LLDPE), or the like, and is provided on the paper base material layer 22 by an extrusion lamination method or the like.

A printed layer 28 may also be provided on the outer side of the thermoplastic resin layer 21 to display patterns or product information. The printing layer 28 can be formed by a known method such as gravure printing or lithographic printing. The thermoplastic resin layer 21 may be subjected to an easy-adhesion treatment such as a corona treatment to improve the adhesion to the printed layer 28. An outer cover layer may be provided on the outer side of the printed layer to improve abrasion resistance or surface decoration.

The paper base material layer 22 can be cardboard such as milk carton base paper, and its basis weight and density can be appropriately selected according to the capacity or design of the container, but the basis weight is 200 g / m ^{2 to} 500 g / m ² , The density is preferably in a range of 0.6 g / cm ³ or more and 1.1 g / cm ³ or less.

The adhesive resin layer 23 is a layer composed of a polyolefin-based resin having a function of adhering the paper base layer 22 and the barrier layer 24. Specifically, high-density polyethylene resin (HDPE), medium-density polyethylene resin (MDPE), LDPE, LLDPE, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer (EAA), and ionomer can be used. Materials, polypropylene (PP), etc. Generally, it is used at a thickness of 10 μm to 60 μm. In order to improve the adhesion strength, the surface of the paper base material layer 22 or the barrier layer 24 may be subjected to a corona treatment, an ozone treatment, an anchor coating, or the like. Alternatively, an adhesive layer using a dry build-up adhesive or the like may be provided instead of the adhesive resin layer.

As the barrier layer 24, a vapor-deposited film including a vapor-deposited layer 24b, such as a metal such as aluminum, silicon oxide, and alumina, and a base film 24a, can be used. Alternatively, a laminated film in which a metal foil 24c such as aluminum is dry-laminated on the base film 24a. In the example shown in FIG. 3A, the barrier layer 24 is a vapor-deposited film, and includes a base film 24 a and a vapor-deposited layer 24 b provided on the inner surface of the packaging container 1. In the example shown in FIG. 3B, the barrier layer 24 is a laminated film, and is composed of a base film 24 a and a metal foil 24 c provided on the outer surface of the packaging container 1. In the case of a vapor-deposited film, the thickness of the vapor-deposited layer is preferably 5 nm to 100 nm. In the case of a laminated film, the thickness of the metal foil is preferably 5 μm or more and 15 μm or less. Further, when a laminated film is used and the notch processed portion 27b is formed by laser light irradiation, as shown in FIG. 3B, the barrier layer 24 is laminated with the metal foil 24c facing the adhesive resin layer 23 so that the metal foil 24c does not cover Laser light to the base film 24a. In addition, a barrier coating type polyethylene terephthalate film obtained by applying barrier-coating to a polyethylene terephthalate film, or a barrier made of a barrier material such as EVOH can be used. Sexual film as the barrier layer 24.

As the base film 24a, resin films such as polyethylene terephthalate (PET), nylon, and polypropylene (PP) can be used. In particular, the biaxially stretched film of PET has a small degree of elasticity during vapor deposition processing or lamination processing, and is therefore suitable. Although the thickness may be 6 μm or more and 25 μm or less, in order to prevent shrinkage due to thermal energy of laser light, the thickness is preferably 12 μm or more.

The adhesive layer 25 may be an adhesive for dry lamination or an adhesive for non-solvent lamination, or may be adhered by extrusion processing using a polyolefin resin. The thickness is preferably in a range of 5 μm to 20 μm. The dry coating amount is preferably in a range from 0.5 g / m ^{3 to} 7.0 g / m ³ .

As the sealing layer 26, HDPE, MDPE, LDPE, LLDPE, and the like can be used. Moreover, it may be a layer containing a part of polybutene. Among the above materials, LLDPE is particularly suitable, and the density is preferably 0.925 or less and the melt index (MI) is 4 or more. The thickness of the sealing layer 26 is preferably 30 μm or more and 100 μm or less, and an unstretched film obtained by using a T-die method or an inflation method is preferred.

4A, 4B, and 4C show a method for disassembling the packaging container 1 according to the first embodiment of the present invention. Hereinafter, each step of this embodiment will be described with reference to FIGS. 4A, 4B, and 4C.

<Squash Step>

FIG. 4A shows the steps of crushing the packaging container 1. In this step, the user of the packaging container 1 can squash the torso portion 102 by pressing the two opposite sides of the side panel 109 of the packaging container 1 constituting the torso portion 102 toward each other. The squashed side panel 109 is a side panel 109 extending below the box top plate 106, and the two side panels 109 connected at right angles to it are now folded toward the inside of the packaging container 1.

The right part of FIG. 4A shows the crushed packaging container 1. By squeezing the packaging container 1 in this manner, the weakened portion 105 formed over the entire circumference of the trunk portion 102 is juxtaposed at the overlapping position when viewed from a plan view.

<Bend-Crack Step>

FIG. 4B shows a step of bending and cracking the packaging container 1 along the weakened portion 105. In this step, the user bends the flattened packaging container 1 along the weakened portion 105 in the manner shown in FIG. 4B.

The user may further bend the packaging container 1 along the weakened portion 105 in the direction shown in the right part of FIG. 4B in a direction opposite to the previous direction. In addition, the bending direction of the packaging container 1 may be bent in only one direction as long as the weakened portion 105 can be sufficiently cracked so that a separation step described later can be easily performed. By bending in this manner once or twice, the packaging container 1 can be cracked at least partially along the weakened portion 105.

<Separation step>

FIG. 4C shows a step of separating a part of the packaging container 1 in which the weakened portion 105 has been cracked from other parts at the cracked portion. In this step, as shown in FIG. 4C, the user tears the cracked part along the weakened part 105 to separate the box top 101 and the trunk part 102. In the bending-cracking step, since at least a part of the weakened portion 105 has cracked, the user can tear the weakened portion 105 with a slight force. As shown in the right part of FIG. 4C, the separated packaging container 1 is in a state in which the box top 101 and the trunk 102 are disassembled into individual bodies.

(Second Embodiment)

FIG. 5 shows a blank 11 of a packaging container 2 according to a second embodiment of the present invention. In addition, in the following description, the same or corresponding components as those of the packaging container 1 are denoted by the same reference numerals, and descriptions thereof are appropriately omitted.

The packaging container 2 has weakened portions formed at three locations. The formation portion of the first weakened portion 105 a is the same as the weakened portion 105 formed in the packaging container 1. The second weakened portion 105b is linearly formed in the height direction of the trunk portion 102, and its upper end is in contact with the first weakened portion 105a, and its lower end is in phase. The third weakened portion 105c is described below. The third weakened portion 105c is formed linearly along the peripheral edge of the bottom portion 103. In addition, since the laminated structure of the sheet is the same as that of the packaging container 1, its description may be omitted.

Like the packaging container 1, the first weakened portion 105 a and the third weakened portion 105 c are formed of notch processed portions 27 a and 27 b formed in the paper base material layer 22 and the barrier layer 24 at a predetermined depth. The second weakened portion 105b serves as the disconnection start portion 113, and the disconnected start portion 113 is a length (for example, about 2 mm) and the first weakened portion 105a and Similarly, in the third weakened portion 105c, notch-processed portions 27a and 27b are formed in the paper base material layer 22 and the barrier layer 24 to a predetermined depth. Then, the remaining portion up to the third weakened portion 105 c is formed with the notch processed portion 27 a only in the paper base material layer 22. The method of forming the cutout portions 27a and 27b is the same as that of the packaging container 1, and its description is omitted.

6A and 6B are partial disassembly methods of the packaging container 2 according to the second embodiment of the present invention. Hereinafter, each step of this embodiment will be described with reference to Figs. 6A and 6B.

<Flattening step to bending-cracking step to separating step>

In this step, the user separates the packaging container 2 into the top portion 101 and the trunk portion 102 in the same steps as the disassembly method of the first embodiment. Since this step is the same as the first embodiment, its description is omitted.

<Torso Disconnection Procedure>

FIG. 6A shows a step of disconnecting the trunk portion 102 of the packaging container 2. In this step, the user weakens the trunk 102 along the second The portion 105b is turned off. Since the second weakening portion 105b is formed with a disconnection start portion 113 that cuts both the paper base material layer 22 and the barrier layer 24, the user can easily start the disconnection operation of the trunk portion 102 as a subsequent interruption. The starting point of the opening action. In addition, since the cutout portion 27b is not formed in the barrier layer 24 except for the disconnection start portion 113 of the second weakened portion 105b, it is possible to prevent the strength of the trunk portion 102 from decreasing.

<Bottom separation step>

FIG. 6B shows a step of separating the bottom 103 of the packaging container 2. In this step, the user tears the linear third weakened portion 105c formed along the periphery of the bottom portion 103 to separate the bottom portion 103 and the trunk portion 102. As a result, the trunk portion 102 and the bottom portion 103 of the packaging container 3 are each separated into a shape as shown in the right portion of FIG. 6B. In addition, the trunk portion 102 is disconnected in the height direction during the trunk portion disconnection step, so that the expanded state can be formed by this step.

In the above embodiments, although a gable top-type packaging container having an injection hole plug is used as an example, as long as the packaging container is bent from a sheet into a box-type packaging container, it can also be applied to a brick-type packaging container without an annotation Packaging container with a tap.

As described above, according to the present invention, it is possible to provide a method for disassembling a packaging container that can be simply and stably implemented by adding a weakened portion to a conventional packaging container.

In each of the above embodiments, as long as the contents can be appropriately packaged, the arrangement of the weakened portion is not limited to the method described above. Either a full-cut or full-cut saddle stitch may be applied to the paper substrate layer, or a half-cut or half-cut saddle stitch may be applied from the outside of the packaging container. It may be provided only on the paper substrate layer, or may be provided so as to penetrate the thermoplastic resin layer or the printing layer. In addition, the barrier layer may be arbitrarily provided as long as it does not penetrate the sealing layer, and may be a full cut or a half cut. It is also possible to penetrate the barrier layer and reach another intermediate layer. These weakened portions may be formed in a plurality of linear shapes that are close to each other.

(Third Embodiment)

Fig. 7 is a perspective view of a packaging container 3 according to a third embodiment of the present invention. Similar to the packaging containers of the first and second embodiments, the packaging container 3 includes a container body 100 formed by folding a plain plate obtained by processing a sheet material into a box shape, and overlapping and closing the ends; and The outlet plug 104 belongs to a resin-made liquid discharge element. The container body 100 includes a top portion 101 positioned on the upper portion, a trunk portion 102 positioned on the side, and a bottom portion 103 positioned on the lower portion. The top 101 includes two box top plates 106 (106a, 106b), a folding plate 107 folded into the box top plate 106, and a return plate 108. The box top plate 106 a is formed with a circular injection hole 112. The injection hole plug 104 includes a liquid nozzle 104 a and a cover 104 b, and is installed in the injection hole 112. In this embodiment, when the top portion 101 is erected toward the container body, a weakening portion 105 is formed in a width direction belonging to the left-right direction to weaken the cracking strength. As the sheet material, a material having the same layer structure as that of the first embodiment can be used.

FIG. 8 is a plan view of a plain plate 12 which is an example of a plain plate as a blank of the container body 100. The plain plate 12 includes: box top plates 106a, 106b, a folding plate 107, and a folding plate 108 constituting the top portion 101; four side panels 109 constituting the trunk portion 102; a bottom panel 110 constituting the bottom portion 103;封 合 部 111。 Sealing section 111. By bending the plain plate 12 along the one-point chain line in FIG. 8, the sealing portion 111 is about to be sealed. Closed on the opposite end, the plain sheet 12 can be formed into a box shape. An injection hole 112 is formed near the center of the box top plate 106a, and the liquid nozzle 104 is inserted and fixed. The box top plates 106a and 106b, the folding-in plate 107, and the return-folding plate 108 form a wire-shaped weakening portion 105 formed on the entire circumferential portion of the container body 100 in the width direction belonging to the left-right direction when the container body 100 is erected. A part of the weakened portion 105 is broken by the injection hole 112. That is, a fold line generated by bending the container body 100 along the weakened portion 105 passes through the injection hole 112.

FIG. 9A is a plan view near the top 101 of the plain plate 13, which is a modified example of the plain plate 12. The difference between the plain plate 12 and the plain plate 13 is at the position where the weakened portion is formed. As shown in FIG. 9A, the weakened portions 105 'of the plain plate 13 include weakened portions 105'a, 105'b formed in a predetermined range across the boundary between the box top plates 106a, 106b and the folding plate 107. When the container body 100 is erected, any sheet is formed in a linear shape in a width direction belonging to the left-right direction. The fold lines generated by bending the container body 100 along the weakened portion 105 'all pass through the injection hole 112.

FIG. 9B is a plan view near the top 101 of the plain plate 14, which is a modified example of the plain plate 12. The difference between the plain plate 12 and the plain plate 14 lies in the portion where the weakened portion is formed. As shown in FIG. 9B, the weakened portion 105 ″ includes the weakened portion 105 b ”surrounding the injection hole 112 in addition to the weakened portion 105 a ″ formed at the same position as the weakened portion 105 of the plain plate 12. A fold line generated by bending the container body 100 along the weakened portion 105 a ″ passes through the injection hole 112. In addition, the weakened portion 105a "is only required to pass the injection line along the fold line generated by its bending. The hole 112 may be sufficient, and it may or may not contact the weakened portion 105b "or the injection hole 112. In the following description, unless otherwise specified, the weakened portion 105 is referred to as the weakened portion 105 'and the weakened portion 105" . The sheets used for these plain sheets can be made of the same material as the sheets of the first and second embodiments.

FIG. 10A is a sectional view of the liquid outlet nozzle 104a. The nozzle 104a includes a cylindrical side wall 301, a disc-shaped flange portion 302 extending from the lower end of the side wall 301 to the outside, and a disc formed on the inner periphery of the lower end of the side wall 301 to block the inside and outside of the packaging container A partition wall 303; and a pull ring 304 extending upward from the partition wall 303 for a user to disconnect the partition wall 303. A male screw 305 is formed on the outer periphery of the side wall 301 to be screwed with a female screw formed on the inner periphery of the cover 104b. After the side wall 301 passes through the injection hole 112, the flange portion 302 and the box top plate 106a around the injection hole 112 are joined by, for example, ultrasonic welding, to fix the liquid outlet nozzle 104a. A thin-walled portion 306 is formed on the outer periphery of the side wall 301 to reduce the thickness of the plate continuously or intermittently.

Fig. 10B shows a nozzle 104a 'as a modification of the nozzle 104a. The difference between the liquid outlet nozzle 104a and the liquid outlet nozzle 104a 'lies in the formation portion of the thin-walled portion 306'. As shown in FIG. 10B, the thin-walled portion 306 'is formed under the flange portion 302 to reduce the thickness of the flange portion 302 to form a continuous or intermittent ring shape. The formation surface of the thin-walled portion is not limited to the lower surface, and may be provided only on the upper surface or on both surfaces.

FIG. 10C shows a nozzle 104a "which is a modification of the nozzle 104a. The difference between the nozzle 104a and the nozzle 104a 'is that The presence or absence of the thin-walled portion 306. As shown in FIG. 10C, the thin-walled portion 306 is not formed on the liquid outlet nozzle 104 a ″.

The liquid outlet nozzles 104a and 104a 'are provided with a thin-walled portion at the liquid outlet. As described later, by bending the container body along the weakened portion, the thin-walled portion will be at least partially cracked.

11A and 11B show a disassembly method according to an embodiment of the present invention. Hereinafter, each step of this embodiment will be described with reference to Figs. 11A and 11B. A method for disassembling the container body 100 and the liquid outlet nozzle 104a using the plain plate 12 will be described below.

<Squash Step>

FIG. 11A shows a crushing step of the packaging container 3. In this step, the user of the packaging container 3 presses the two side panels 109 that extend below the box top plate 106 and are opposed to each other in a direction in which they are in contact with each other. The two side panels 109 connected to the sandwiched side panel 109 are folded toward the inside of the packaging container 3, so that the trunk portion 102 and the top portion 101 are crushed.

<First bending step>

FIG. 11B shows a step of bending the packaging container 3 along the weakened portion 105. In this step, the user bends the box top 106 along the weakened portion 105 as shown in FIG. 11B. At this time, the fold line generated in the box top plate 106 passes through the injection hole 112.

Since the fold line generated in the box top plate 106 passes through the injection hole 112, a part of the flange portion 302 of the liquid nozzle 104a attached to the injection hole 112 is also loaded and bent in the same direction as the box top plate 106a. Here, in the case where the thin-walled portion 306 is formed in the liquid discharge nozzle 104a, With the above load, as shown in the right-side partial cross-sectional view of the liquid outlet nozzle 104a, at least a partial crack is generated from the thin-walled portion 306.

<Injection hole plug separation step>

The left part of FIG. 12A shows a step of separating at least a part of the injection hole plug 104 from the packaging container 1. Since the thin-walled portion 306 of the nozzle 104a is cracked in the previous step, the user can use this as a starting point to separate the injection hole plug 104 from the packaging container 1 with a little force.

<2nd bending step>

The right part of FIG. 12A shows a step of cracking the packaging container 1 along the weakened portion 105. In this step, as shown in the right part of FIG. 12A, the user bends the box top plate 106 along the weakened portion 105. The bending operation may be performed a plurality of times in each direction.

Through this step, the weakened portion 105 is cracked. In addition, if the weakening portion 105 is sufficiently cracked by the first bending step, this step may be omitted.

<Box top plate separation step>

The left part of FIG. 12B shows a step of separating a part of the box top plate 106 from the packaging container 1 along the weakened portion 105. In this step, the user pulls a part of the box top plate 106 along the weakened portion 105 and the bent portion from the packaging container 1 and separates it. In the previous step, since the weakened portion 105 has at least a partial crack, the user can use the weakened portion 105 as a starting point to separate the upper portion of the box top plate 106 with a little force. As shown in the right part of FIG. 12B, the separated packaging container 1 has been disassembled into the respective states of the upper part of the box top plate 106, the trunk part 102, and the injection hole plug 104.

As explained above, according to this dismantling method, the injection hole plug can be easily separated with a little force. In addition, when the weakened portion is provided in the width direction, it is easy to hold the upper side and the lower side of the weakened portion by hand, respectively, so that the packaging container 1 can be easily bent, and a part of the box top plate 106 is easily removed from the packaging container 1 Separation makes it easy to disassemble the trunk later. Therefore, a series of operation procedures can be used to remove the injection hole plug, and the trunk can also be disassembled. Consumers will not worry about disassembly. In addition, the top part of the box top sealing part, which is tightly closed and difficult to recycle, can be separated from other parts, and disassembly can be performed for recycling. In contrast, in the case where the weakened portion is provided in a height direction orthogonal to the width direction of the packaging container 1, the left and right sides of the weakened portion must be grasped by hands, and together with the tight seal, the rigidity is high. The top seal of the box is bent together. Therefore, compared with the case where a weakening part is provided in the width direction, the gripping of the packaging container 1 is more difficult and requires a larger force. In addition, in order to separate the box top sealing portion from other parts, it is necessary to cut it with scissors or the like, and it is cumbersome to perform disassembly suitable for recycling. Therefore, the direction in which the weakened portion is formed is preferably the higher direction in the width direction of the packaging container 1.

The above-mentioned disassembling method can also be applied to a combination of a container body made of the plain plate 10 or the plain plate 20 and any one of the nozzle 104a, the nozzle 104a ', or the nozzle 104a ".

When the plate body 14 is used for the container body, the packaging container can be disassembled in substantially the same manner as the disassembly method described above. In the first bending step, the attenuating portion 105b ″ also generates at least a partial crack. In this way, in the injection hole plug separation step, the liquid can be easily discharged along the attenuating portion 105b ″ together with the surrounding area of the container body. Mouth is completely separated. Therefore, Rong When the plain plate 14 is used for the device body, in addition to the liquid discharge nozzles 104a, 104a ', a liquid discharge nozzle 104a "having no thin-walled portion may be used.

The present invention is not limited to the embodiments described above. The characteristics of each embodiment may be appropriately combined and implemented after being changed.

Examples

The packaging containers of Examples 1 to 6 and Comparative Examples 1 to 4 were produced, and the method for disassembling the packaging container of the present invention was evaluated.

(Example 1)

The sheets are in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / barrier layer (alumina evaporation + PET substrate film, 12 μm) / LLDPE (60 μm). Using this sheet, the plain plate 10 shown in FIG. 2 was produced, and the plain plate 10 was used to produce a packaging container with a capacity of 2000 ml.

In the LDPE and the paper base material layer, a half-removed cut processing portion is formed by a die process as shown in FIG. 3A, and the depth thereof reaches three-fourths of the thickness of the paper base material layer. Furthermore, in the barrier layer, one fully-removed notch processed portion is formed by laser processing. The laser light is a carbon dioxide gas laser device (ML-Z9510 manufactured by Keyence Corporation, the same applies hereinafter), and the irradiation is performed at a radiation output of 70% and a scanning speed of 2500 mm / sec.

Each part of the plain plate that has been processed as described above is pasted and formed, and then the injection hole plug is installed to obtain a packaging container.

Once the content liquid is injected and it is confirmed that no leakage or the like has occurred, the content liquid is poured out, and the packaging container is disassembled by the disassembly method of the first embodiment. As a result, the packaging container can be easily disassembled.

(Example 2)

The sheets are in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / aluminum foil (7μm) / 2 axis stretch PET film (12μm) / LLDPE (60 μm). A plain plate 11 shown in FIG. 5 was produced from the sheet, and a packaging container having a capacity of 900 ml was produced using the plain plate 11.

Only the paper base material layer was processed by a die to form a fully-removed notch processing portion. The notch processing portion is formed into a riding stitch shape, and a full-removed portion of 10 mm and an engagement portion (unprocessed portion) of 1 mm are repeatedly formed. In the barrier layer, one and a half cut-out processed portions are formed by laser processing. The laser light uses a carbon dioxide gas laser device, and is irradiated under conditions of an irradiation output of 70% and a scanning speed of 2500 mm / sec. This notch processing portion is also formed into a riding stitch shape, and is formed by repeatedly arranging a half-removed portion of 8 mm and an engagement portion of 1 mm.

A packaging container was produced in the same manner as in Example 1.

Once the content liquid is injected and it is confirmed that no leakage or the like has occurred, the content liquid is poured out, and the packaging container is disassembled by the disassembly method of the second embodiment. As a result, disassembly can be easily performed.

(Example 3)

The sheets are in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / barrier layer (aluminum evaporation + PET substrate film, 12μm ) / LLDPE (60 μm). The plain sheet 11 shown in FIG. 5 was produced from the sheet, and a packaging container having a capacity of 1800 ml was produced using the plain sheet 11.

In the printed layer, the LDPE, and the paper base material layer, a half-removed cut processing portion having a depth of two-thirds of the entire thickness of the printed layer, the LDPE, and the paper base material layer is formed by die processing. The notch processing portion is formed in a riding stitch shape, and is formed by repeatedly setting a half-removed portion of 10 mm and an engagement portion of 1 mm. The barrier layer is formed with a half-removed cut portion by laser processing. The laser light uses a carbon dioxide gas laser device, and is irradiated with a radiation output of 70% and a scanning speed of 2000 mm / sec. This notch processing portion is also formed into a riding stitch shape, which is formed by overlapping the semi-removed portion of 8mm and the joint portion of 1mm.

A packaging container was produced in the same manner as in Example 1.

The packaging container was disassembled in the same manner as in Example 2. As a result, it can be easily disassembled.

(Example 4)

As in Example 1, the sheets are laminated in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / barrier layer (alumina It was prepared by vapor deposition + PET substrate film, 12 μm) / LLDPE (60 μm).

This sheet is used to form the plain sheet 12 shown in FIG. The weakened part is formed by a die in the printing layer, LDPE, and paper base material layer to form a linear and semi-removable cut processing portion having a depth of three-fourths of the thickness of the paper base material layer; The light processing is performed to form one linearly-removed notch processing portion. For the laser light, a carbon dioxide gas laser device (ML-9510 manufactured by Keyence Corporation, which is the same in the following examples) was used, and irradiation was performed under the conditions of an irradiation output of 70% and a scanning speed of 2500 mm / sec.

The end of the plain plate that has been processed as described above is bonded to form the container body, and then the liquid nozzle 104a is installed to obtain a packaging container with a capacity of 2000 ml.

Once the content liquid is injected and it is confirmed that no leakage or the like has occurred, the content liquid is poured out, and the packaging container is disassembled according to the disassembly method of the third embodiment. In the first bending step, it was confirmed that a part of the thin-walled portion of the liquid nozzle was cracked, and in the injection hole plug separation step, the liquid nozzle was easily separated from the cracked portion. In the second bending step, cracks can easily occur in the weakened portion.

(Example 5)

The sheet is laminated in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / aluminum foil (7μm) / 2 axis stretch PET film (12μm ) / LLDPE (60 μm).

This sheet is used to form the plain sheet 13 shown in FIG. 9A. A die-cut portion was formed in the paper base material layer by cutting with a die as a weakened portion. This notch processing portion is formed by repeating a 10 mm total removal portion and a 1 mm engagement portion (unprocessed portion) to form a saddle stitch shape. In addition, the barrier layer is formed by laser light processing to form a fully-removed notch processing portion. The laser light is a carbon dioxide gas laser device, and is irradiated under the conditions of an irradiation output of 70% and a scanning speed of 2500 mm / sec. The notch processing portion of the barrier layer is formed by repeating the total removal portion of 8 mm and the engagement portion of 1 mm to form a riding stitch shape, and the other conditions are the same as those of the second embodiment.

After the ends of the plain plate that had been processed as described above were bonded to form the container body, the liquid nozzle 104a 'was installed to produce a packaging container having a capacity of 900 ml.

Once the content liquid is injected and it is confirmed that no leakage or the like has occurred, the content liquid is poured out, and the packaging container is disassembled according to the disassembly method of the third embodiment. In the first bending step, it has been confirmed that a part of the thin-walled portion of the liquid nozzle is cracked; in the injection hole plug separation step, the liquid nozzle can be easily separated from the cracked portion. In the second bending step, cracks can easily occur in the weakened portion.

(Example 6)

The sheet is laminated in order from the outside to the inside of the packaging container: printing layer / LDPE (18μm) / paper substrate layer (400g / m ² ) / EMAA (30μm) / barrier layer (aluminum vapor deposition + PET substrate film, 12 μm) / LLDPE (60 μm).

This sheet is used to form the plain plate 14 shown in FIG. 9B. By die processing, a half-removed cut processing portion is formed in the printed layer, LDPE, and paper base layer to a depth of two-thirds of the entire thickness of the printed layer, LDPE, and paper base layer as a weakened portion. The notch processing portion is formed by half-removing portions of 10 mm and engaging portions of 1 mm repeatedly to form a riding stitch shape. In addition, the barrier layer is formed by laser light processing to form a fully-removed notch processing portion. The laser light was irradiated using a carbon dioxide gas laser device under the conditions of an irradiation output of 70% and a scanning speed of 2000 mm / sec. The cut-out portion of the barrier layer is the same as that of the above-mentioned Example 3, except that a full-removed portion of 8 mm and an engagement portion of 1 mm are repeatedly formed to form a riding stitch shape. In addition, the weakened portion 105 a ″ is formed across the weakened portion 105 b ″, and is formed on the outer periphery of the injection hole 112. The weakened portion 105 b ″ is formed into a large circle of 7 mm with the outer diameter of the injection hole 112 as a radius.

After the ends of the plain plate material subjected to the above-mentioned processing were bonded and molded, a liquid nozzle 104a "was installed to obtain a packaging container having a capacity of 1800 ml.

Once the content liquid is injected and it is confirmed that no leakage or the like has occurred, the content liquid is poured out, and the packaging container is disassembled according to the disassembly method of the third embodiment. In the first bending step, it was confirmed that a part of the weakened portion 105b ″ may be cracked; in the injection hole plug separation step, the liquid ejection nozzle can be easily separated from the cracked portion. Furthermore, in the second bending step, In the step, the weakened portion 105a "can be easily cracked.

(Comparative example 1)

Using the same sheet as in Example 1, a packaging container having the same shape as that of Example 1 in which the weakened portion was not formed was produced and disassembled in the same manner as in Example 1.

(Comparative example 2)

Using the same sheet as in Example 2, a packaging container having the same shape as in Example 2 in which the weakened portion was not formed was used, and disassembly was performed in the same manner as in Example 1.

(Comparative example 3)

Using the same sheet as in Example 3, a packaging container having the same shape as in Example 3 in which the weakened portion was not formed was produced, and disassembly was performed in the same manner as in Example 1.

(Comparative Example 4)

The same sheet as in Example 1 was used, and the weakened portion was formed by two notch-processed portions at 15 mm intervals. Using this sheet, a packaging container having the same shape as in Example 1 was produced. From the sheet bonding portion of the packaging container, a portion sandwiched by the two notch processing portions was cut out to disintegrate.

The easiness of disassembly and the oxygen barrier property of the packaging containers of the above examples and comparative examples were compared. The oxygen barrier property is measured at a temperature of 20 ° C and a humidity of 60% RH. The results are shown in Table 1. In Table 1, "+" indicates that it can be easily disassembled, "-" indicates that it cannot be disassembled, and "-" indicates that it can be disassembled, but it is not easy.

In the case where the packaging containers of Examples 1 to 6 were used, they were easily disassembled. On the other hand, when the packaging containers of Comparative Examples 1 to 3 were used, they could not be disassembled. In addition, when the packaging container of Comparative Example 4 was used, there were cases where the part sandwiched by the two cut-out processing portions was difficult to cut at the bonding portion of the sheet, or the paper base material was peeled off and could not be separated, so it could not be easily disassembled. . It was also confirmed that the oxygen barrier property does not cause a problem due to the presence or absence of the weakened portion.

From the above comparison results, it can be confirmed that the disassembly method of the present invention can improve the ease of disassembly, and there is no problem of oxygen barrier property.

[Industrial availability]

The present invention is useful for a paper packaging container or the like containing a liquid.

Claims (19)

A packaging container is formed by bending a sheet material, and includes a container body. The container body includes a trunk portion as a side surface, and a top portion and a bottom portion connected to each end portion thereof. A wire-like shape is formed on the container body. The first weakened part. The packaging container according to claim 1, wherein the first weakened portion is formed on the entire circumference of the trunk portion of the packaging container, and when the trunk portion of the packaging container is flattened, it is located at a position overlapping in a plan view. The packaging container according to claim 1, wherein the container body has an injection hole at the top of the container body, and a resin-made liquid part installed in the injection hole, which is produced by bending the container body along the first weakened portion. The broken line passes through the aforementioned injection hole. The packaging container according to claim 1, wherein the first weakened portion extends in a width direction which is a horizontal direction when the container body is erected. The packaging container according to any one of claims 1 to 4, wherein the sheet material has at least a thermoplastic resin layer, a paper base material layer, a barrier layer, and a sealing layer in order from the outside to the inside of the packaging container. The first weakened portion is configured by a notch processing portion provided at least in the paper base material layer and a notch processing portion provided at a position overlapping the notch processed portion of the paper base material layer provided in the barrier layer. The packaging container according to claim 5, wherein the notch processing portion provided on the aforementioned paper substrate layer is subjected to semi-removal processing or full removal processing, and the notch processing portion provided on the aforementioned barrier layer is subjected to semi-removal processing or full removal processing. The packaging container according to claim 5, wherein the barrier layer is a vapor-deposited film on which a metal layer is vapor-deposited on a base film, a transparent vapor-deposited film on which an inorganic oxide is vapor-deposited, and a metal is laminated on the base film A laminated film of a foil, or a coating film in which a barrier film is applied to a base film. The packaging container according to claim 7, wherein the substrate film is an stretched film of polyethylene terephthalate. The packaging container according to claim 2, wherein a linear second weakened portion extending in a height direction of the trunk portion is further formed on the bottom portion of the packaging container than the first weakened portion. The packaging container according to claim 9, further comprising a linear third weakened portion along the peripheral edge of the bottom of the packaging container. The packaging container according to claim 3, wherein the liquid discharge member is formed with a thin-walled portion that is at least partially cracked by bending the container body along the first weakened portion. The packaging container according to claim 3 or 11, wherein the liquid discharge member is at least partially separated from the container body by bending the container body along the first weakened portion. The packaging container according to claim 3 or 11, wherein a part of the first weakened part and other parts of the first weakened part are formed in a position where they can overlap in a plan view when the top of the packaging container is flattened. . A method for disassembling a packaging container. The packaging container is formed by bending a sheet, and includes a container body. The container body includes a torso portion belonging to a side, and a top and a bottom connected to ends thereof. The method includes the steps of: flattening the trunk and the top of the packaging container; bending the flattened packaging container along a linear first weakened portion formed on the container body to crack at least partially; and And a step of separating the packaging container along the cracked portion of the first weakened portion. The method for disassembling the packaging container according to claim 14, wherein a linear second weakened portion extending in a height direction of the trunk portion is further formed in the bottom portion of the packaging container from the first weakened portion, and After the separation step, the method further includes a step of cutting a portion including the bottom side of the packaging container along the second weakened portion. The method for disassembling a packaging container according to claim 15, wherein a linear third weakened portion along the periphery of the bottom is further formed on the bottom of the packaging container, and further includes a third weakened portion along the third breaking portion after the disconnecting step. The step of disconnecting and separating the bottom and the trunk. The method for disassembling a packaging container according to claim 14, wherein the packaging container is provided with an injection hole on the top of the container body, and a resin-made liquid piece attached to the injection hole, and is weakened along the first The folding line generated by bending the container body is passed through the injection hole, and further includes a step of separating at least a part of the liquid discharge member from the packaging container when the packaging container is folded along the first weakening portion. . The method for disassembling a packaging container according to claim 17, wherein the step of separating at least a portion of the liquid-discharging member from the packaging container includes cracking at least a portion of the liquid-discharging member along a thin-walled portion provided on the liquid-discharging member. step. The method for disassembling a packaging container according to claim 17 or 18, wherein, in the flattening step, at least a part of the first weakened portion and another at least a part of the first weakened portion overlap in a plan view.