JP6772537B2 - Paper container and its dismantling method - Google Patents

Description

The present invention relates to a Goebel top type paper container provided with a pouring member and a method for disassembling the same.

A conventional Goebel top type paper container used for packaging alcoholic beverages, beverages, etc. is disclosed in Patent Document 1. This paper container is formed by bending a blank plate in which an outer surface adhesive layer is laminated on the outer surface of the paper base material layer and a barrier layer and an inner surface adhesive layer are laminated in this order on the inner surface. The barrier layer is formed of an aluminum foil, an aluminum vapor deposition film, an inorganic oxide vapor deposition film, or the like in order to prevent oxidative deterioration and taste deterioration of the contents.

Further, in the paper container, the upper and lower surfaces of the tubular body portion are closed by the inclined roof portion and the bottom surface portion, respectively. An injection member of a resin molded product that forms an injection port is attached to the inclined roof portion.

In recent years, due to growing environmental problems, when an empty container is disposed of after use, the empty container is disassembled, separated for each type of constituent member, and the volume is reduced for recycling. In the above paper container, the upper end portion of the inclined roof portion is firmly heat-bonded to prevent leakage of the liquid contents. Therefore, when disassembling the paper container, scissors are inserted from the spout to open the paper container and recycled.

Japanese Unexamined Patent Publication No. 09-226752 (Pages 2-4, Fig. 2)

However, according to the conventional Goebel top type paper container, it is difficult to cut with scissors because the injection member forming the injection outlet is formed of resin. Therefore, the paper container cannot be easily disassembled, and there is a problem that the recyclability of the paper container is poor.

An object of the present invention is to provide a paper container capable of improving recyclability and a method for disassembling the paper container.

In order to achieve the above object, the present invention presents in order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer in which a barrier layer having gas barrier property is arranged on one surface, and thermoplasticity. A tubular body having a rectangular cross section, a sloping roof that closes the top surface of the body, a bottom surface that closes the bottom surface of the body, and the inclination In the method of disassembling a Goebel top type paper container equipped with a resin injection member attached to the roof.
A pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and an upper end portion of the ceiling side plate, with the inclined roof portion inclined and facing each other in the front-rear direction. A first adhesive portion that is folded in half and bonded by the outer surface adhesive layer, and a pair of protruding portions that project upward from the ceiling side plate and are provided on the ceiling front plate and the ceiling back plate, respectively, are formed on the inner surface adhesive layer. The second adhesive portion bonded to each other by the above, the third adhesive portion in which the ceiling side plate and the upper end portion of the ceiling front plate are bonded to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling back plate. It has a fourth adhesive portion that is bonded to each other by the inner surface adhesive layer.
At the upper ends of the ceiling front plate, the ceiling back plate, and the ceiling side plate, a peeling layer that allows both to be peeled off is arranged between the paper base material layer and the barrier layer, and the ceiling side plate A release agent that reduces the adhesive strength of the outer surface adhesive layer is arranged in a predetermined area on the outer surface adhesive layer at the upper end portion.
A first peeling step of peeling off the first adhesive portion and the second adhesive portion by applying a force in a direction in which the ceiling front plate and the ceiling back plate are separated from each other.
A force is applied in the direction in which the ceiling front plate and the ceiling side plate are separated to peel off the third adhesive portion, and a force is applied in the direction in which the ceiling back plate and the ceiling side plate are separated to pull the fourth adhesive portion. The second peeling step to peel off and
A vertical cutting step of cutting from the upper end of the inclined roof portion opened by the first peeling step and the second peeling step to the lower end of the body portion in the vertical direction.
A lateral cutting step of cutting the lower end portion of the body portion in the circumferential direction to separate the bottom surface portion.
A step of removing the pouring member by cutting a predetermined area of the slanted roof portion and separating at least the pouring member.
It is characterized by having.

According to this configuration, the two-folded upper end portion of the ceiling side plate is bonded at the first adhesive portion by superimposing an outer surface adhesive layer on which a release agent is arranged. The protruding portion of the upper end of the ceiling front plate provided with the peeling layer and the protruding portion of the upper end of the ceiling back plate provided with the peeling layer are adhered by the inner surface adhesive layer at the second adhesive portion. The upper end of the ceiling front plate provided with the release layer and the upper end of the ceiling side plate provided with the release layer are adhered to each other by the inner surface adhesive layer at the third adhesive portion. The upper end of the ceiling back plate provided with the release layer and the upper end of the ceiling side plate provided with the release layer are adhered at the fourth adhesive portion by the inner surface adhesive layer. In the first peeling step, the first adhesive portion is easily peeled off by the release agent, and the second adhesive portion is easily peeled off by the release layer facing the second adhesive portion. In the second peeling step, the third adhesive portion and the fourth adhesive portion are easily peeled off by the release layer facing the third adhesive portion and the fourth adhesive portion. As a result, scissors or the like are inserted from the upper end of the opened inclined roof portion, and the paper container is developed by the vertical cutting step and the horizontal cutting step to separate the bottom surface portion. Then, the dispensing member is separated from the body by cutting the periphery of the dispensing member and the lower end of the ceiling front plate by the dispensing member removing step.

Further, in the method of disassembling a paper container having the above structure, the present invention provides the peeling layer on the entire surface between the barrier layer and the paper base material layer, and the barrier layer and the paper base material layer are provided on the peeling layer. It is characterized by providing a barrier layer peeling step for peeling. According to this configuration, the blank plate from which the bottom and the pouring member are separated is peeled off by the peeling layer, and the barrier layer and the paper base material layer are separated.

Further, in the method of disassembling a paper container having the above configuration, the present invention has at least the inner surface of one or both of the pair of protrusions on one side end and one or both of the other side ends of the pair of protrusions. It is characterized by providing an opening start portion that penetrates the adhesive layer and the barrier base material layer. According to this configuration, when the ceiling side plate at the side end of the second adhesive portion and the opening start portion are peeled off in the first peeling step, the inner surface adhesive layer and the barrier base material layer of the protruding portion are torn apart. , The second adhesive portion is peeled off.

Further, in the method of disassembling the paper container having the above configuration, the present invention has a non-adhesive non-adhesive portion between the ceiling front plate and the ceiling back plate between the second adhesive portion and the upper end surface of the ceiling side plate. It is characterized in that the opening start portion is provided and arranged on the non-adhesive portion. According to this configuration, in the first peeling step, the space between the ceiling side plate at the side end of the second adhesive portion and the opening start portion can be easily peeled off by the non-adhesive portion.

Further, the present invention is characterized in that, in the method of disassembling the paper container having the above configuration, chamfers are provided at both end portions of the protruding portion.

Further, the present invention is characterized in that, in the method of disassembling the paper container having the above configuration, the upper end surface of the ceiling side plate is a horizontal plane or a concave surface having both end points as the uppermost points. According to this configuration, both end portions of the second adhesive portion can be adhered with a predetermined adhesive strength, and the adhesive area of the first, second, and third adhesive portions can be reduced.

Further, the present invention is characterized in that, in the method of disassembling a paper container having the above configuration, at least a plurality of opening assisting portions penetrating the inner surface adhesive layer and the barrier base material layer are provided at the upper end portion of the ceiling side plate. According to this configuration, in the first peeling step, the first adhesive portion is peeled off in order between the plurality of opening auxiliary portions. Further, in the second peeling step, the third adhesive portion and the fourth adhesive portion are sequentially peeled between the plurality of opening auxiliary portions.

Further, the present invention is configured in the method of disassembling a paper container having the above configuration, in which the body portion and the inclined roof portion are closed in the circumferential direction by adhesion of a glue margin piece provided at the end of the blank plate, and the glue is formed. A first cutting line indicating the cutting position of the vertical cutting step is drawn along the substitute piece, and a second cutting line indicating the cutting position of the horizontal cutting step is drawn at the lower end of the body portion. ..

According to this configuration, the body portion and the inclined roof portion are cut in the vertical direction along the first cutting line in the vertical cutting step. Further, in the lateral cutting step, the body portion is cut in the circumferential direction along the second cutting line.

Further, the paper container of the present invention is characterized in that it is used in a method for disassembling the paper container having each of the above configurations.

Further, in the present invention, in order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer having a barrier layer having gas barrier property arranged on one surface, and an inner surface adhesive layer having thermoplasticity are provided. A tubular body portion having a rectangular cross section, an inclined roof portion that closes the top surface of the body portion, a bottom surface portion that closes the bottom surface of the body portion, and a resin attached to the inclined roof portion, which is composed of laminated blank plates. In a Goebel top type paper container equipped with an injection member made of
A pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and an upper end portion of the ceiling side plate, with the inclined roof portion inclined and facing each other in the front-rear direction. A first adhesive portion that is folded in half and bonded by the outer surface adhesive layer, and a pair of protruding portions that project upward from the ceiling side plate and are provided on the ceiling front plate and the ceiling back plate, respectively, are formed on the inner surface adhesive layer. The second adhesive portion bonded to each other by the above, the third adhesive portion in which the ceiling side plate and the upper end portion of the ceiling front plate are bonded to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling back plate. It has a fourth adhesive portion that is bonded to each other by the inner surface adhesive layer.
At the upper ends of the ceiling front plate, the ceiling back plate, and the ceiling side plate, a peeling layer that allows both to be peeled off is arranged between the paper base material layer and the barrier layer, and the ceiling side plate It is characterized in that a release agent for reducing the adhesive strength of the outer surface adhesive layer is arranged in a predetermined region on the outer surface adhesive layer at the upper end portion.

Further, in the paper container having the above configuration, at least the inner surface adhesive layer and the inner surface adhesive layer and the one side end portion of one or both of the pair of the protrusions and the other side end portion of one or both of the pair of the protrusions It is characterized in that an opening start portion that penetrates the barrier base material layer is provided.

Further, in the paper container having the above configuration, a non-adhesive non-adhesive portion is provided between the ceiling front plate and the ceiling back plate between the second adhesive portion and the upper end surface of the ceiling side plate. It is characterized in that the opening start portion is arranged on the non-adhesive portion.

Further, the present invention is characterized in that, in the paper container having the above structure, the opening start portion is composed of pores provided on the blank plate.

Further, the present invention is characterized in that, in the paper container having the above structure, the opening start portion is composed of a notch or a notch obtained by cutting the blank plate.

Further, the present invention is characterized in that the paper container having the above structure is provided with chamfers at both side ends of the protruding portion.

Further, the present invention is characterized in that, in the paper container having the above structure, the lower end of the chamfer is arranged within 2 mm above the intersection of the upper end surface of the ceiling side plate and the protruding portion.

Further, the present invention is characterized in that, in the paper container having the above structure, the upper end surface of the ceiling side plate is a horizontal plane or a concave surface having both end points as the uppermost points.

Further, the present invention is characterized in that, in the paper container having the above structure, at least a plurality of opening assisting portions penetrating the inner surface adhesive layer and the barrier base material layer are provided at the upper end portion of the ceiling side plate.

Further, the present invention is characterized in that, in the paper container having the above structure, the opening auxiliary portion is composed of pores provided on the blank plate.

Further, the present invention is characterized in that, in the paper container having the above structure, the opening assisting portion comprises a notch or a notch obtained by cutting the blank plate.

Further, the present invention is configured in a paper container having the above configuration in a state in which the body portion and the inclined roof portion are closed in the circumferential direction by adhesion of a glue margin piece provided at the end of the blank plate, and the glue margin piece is formed. It is characterized in that a first cutting line extending vertically along the line is drawn and a second cutting line extending in the circumferential direction is drawn at the lower end of the body portion.

According to the present invention, a Goebel top type paper container provided with a pouring member can be easily cut open and disassembled. Therefore, the recyclability of the paper container can be improved.

A perspective view of the paper container of the first embodiment of the present invention as viewed from the front side. Perspective view of the paper container of the first embodiment of the present invention as viewed from the back side. Side sectional view of the upper end portion of the paper container according to the first embodiment of the present invention. Top sectional view of the upper end of the paper container according to the first embodiment of the present invention. A development view showing a blank plate of a paper container according to the first embodiment of the present invention. Sectional drawing which shows the layer structure of the blank plate of the paper container of 1st Embodiment of this invention. A perspective view showing a state after the first peeling step of the paper container of the first embodiment of the present invention. A perspective view showing a state after the second peeling step of the paper container of the first embodiment of the present invention. Top view showing the state after the transverse cutting process of the paper container of 1st Embodiment of this invention. A development view showing a blank plate of a paper container according to a second embodiment of the present invention. A development view showing a blank plate of a paper container according to a third embodiment of the present invention. A development view showing a blank plate of a paper container according to a fourth embodiment of the present invention. Sectional drawing which shows the layer structure of the blank plate of the paper container of 4th Embodiment of this invention.

<First Embodiment>
An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view seen from the front side and a perspective view seen from the back side of the paper container of the first embodiment. The paper container 1 is composed of a Goebel top type, and includes alcoholic beverages (sake, wine, shochu, etc.), beverages (coffee, milk beverages, juice, tea, etc.), seasonings (dressing, etc.) or sanitary goods (shampoo, conditioner, etc.). Is filled with liquid contents such as.

The paper container 1 includes a main body 2 and a pouring member 3. The main body 2 is formed by bending a blank plate 100 (see FIG. 5) having a paper base material layer 62 (see FIG. 6) into a box shape. The injection member 3 is made of a resin molded product, forms an injection port for the contents, and is opened and closed by the cap 3a.

In the main body 2, the bottom surface of the tubular body 10 is closed by the bottom surface 20, and the top surface of the body 10 is closed by the inclined roof 30. The body portion 10 is formed into a rectangular horizontal cross section in which both side ends of the front plate 13 and the back plate 11 facing each other are connected by a pair of left and right side plates 12 and 14. The back plate 11, the side plate 12, the front plate 13, and the side plate 14 are connected in this order in the horizontal direction to form a peripheral plate forming the peripheral surface of the body portion 10.

The inclined roof portion 30 is formed by connecting both ends of the ceiling front plate 33 and the ceiling back plate 31 which are inclined and opposed to each other by a pair of left and right ceiling side plates 32 and 34. The ceiling front plate 33 is continuously provided above the front plate 13 and is inclined rearward. The ceiling back plate 31 is continuously provided above the back plate 11 and is inclined forward. The ceiling side plate 32 and the ceiling side plate 34 are connected above the side plate 12 and the side plate 14, respectively, and are arranged between the ceiling front plate 33 and the ceiling back plate 31 so as to be inclined inward.

3 and 4 show a side sectional view and an upper sectional view of the upper end portion of the inclined roof portion 30. Note that FIG. 3 shows a cross section passing over the ceiling side plate 32. The upper ends of the ceiling side plate 32 and the ceiling side plate 34 are folded in half by valley folding, and are arranged between the upper end portion of the inclined ceiling front plate 33 and the upper end portion of the ceiling back plate 31.

The upper end portion of the ceiling side plate 32 folded in half is heat-bonded by an outer surface adhesive layer 61 (see FIG. 6) described later, and a heat-bonded portion 36 (first adhesive portion) is formed. The upper end of the ceiling side plate 34 folded in half is heat-bonded by the outer surface adhesive layer 61 (see FIG. 6) to form the heat-bonded portion 37 (first adhesive portion).

The ceiling front plate 33 and the ceiling back plate 31 have projecting portions 33b, 31b protruding upward from the ceiling side plates 32, 34. The protruding portions 33b and 31b are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) of each inner surface described later, and the heat-bonded portion 38 (second adhesive portion) is formed.

The upper ends of the ceiling side plate 32 and the ceiling front plate 33 are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) of each inner surface to form a heat-bonded portion 39 (third adhesive portion). The upper ends of the ceiling side plate 34 and the ceiling front plate 33 are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) of each inner surface to form a heat-bonded portion 40 (third adhesive portion).

The upper ends of the ceiling side plate 32 and the ceiling back plate 31 are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) of each inner surface to form the heat-bonded portion 41 (fourth adhesive portion). The upper ends of the ceiling side plate 34 and the ceiling back plate 31 are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) of each inner surface to form the heat-bonded portion 42 (fourth adhesive portion).

FIG. 5 shows a developed view of the blank plate 100 of the paper container 1. The blank plate 100 in which the main body 2 of the paper container 1 is developed is provided with a folding line 90 at a predetermined position, and the rectangular back plate 11, the side plate 12, the front plate 13, the side plate 14, and the glue margin piece 15 are arranged in one direction. It will be installed in sequence.

A ceiling back plate 31 is continuously provided at the upper end of the back plate 11, and a bottom plate 21 is continuously provided at the lower end. A ceiling side plate 32 is continuously provided at the upper end of the side plate 12, and a bottom plate 22 is continuously provided at the lower end. A ceiling front plate 33 is continuously provided at the upper end of the front plate 13, and a bottom plate 23 is continuously provided at the lower end. A ceiling side plate 34 is continuously provided at the upper end of the side plate 14, and a bottom plate 24 is continuously provided at the lower end. A glue margin piece 35 is continuously provided at the upper end of the glue margin piece 15, and a glue margin piece 25 is continuously provided at the lower end. The ceiling front plate 33 is provided with an insertion hole 33a for attaching the injection member 3 (see FIG. 1).

The upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are inclined from both side ends toward the center and formed into a convex surface with the central portion as the uppermost point. The protruding portions 33b and 31b at the upper ends of the ceiling front plate 33 and the ceiling back plate 31 project upward from the uppermost points of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34.

As will be described in detail later, the upper ends of the ceiling side plate 32 and the ceiling side plate 34 are folded in half and the outer surfaces are heat-bonded. At this time, the release agent 69 is applied to a part of the upper end portions (indicated by hatching in the figure) of the ceiling side plate 32 and the ceiling side plate 34.

Further, on the ceiling side plate 34 and the side plate 14 at one end in the circumferential direction, a cutting line 51 extending in the vertical direction along the glue margin pieces 35 and 15 is drawn by the print layer 68 (see FIG. 6). The cutting line 51 is formed from the upper end of the ceiling side plate 34 to the lower end of the side plate 14. A cutting line 52 extending in the horizontal direction is drawn by the print layer 68 (see FIG. 6) on the lower ends of the back plate 11, the side plate 12, the front plate 13, and the side plate 14 of the body portion 10. The cutting line 52 is formed along the folding line 90 at the lower ends of the back plate 11, the side plate 12, the front plate 13, and the side plate 14.

The blank plate 100 is formed into a tubular shape by bending at a folding line 90 and heat-bonding the glue margin piece 15, the glue margin piece 25, and the glue margin piece 35. That is, the glue margin piece 15 connected to the side plate 14 at one end is heat-bonded to the back plate 11 at the other end to form a tubular body portion 10 closed in the circumferential direction. The glue margin piece 25 connected to the bottom plate 24 at one end is thermally adhered to the bottom plate 21 at the other end, so that the bottom surface 20 is formed in a state where the lower end is opened and closed in the circumferential direction. The glue margin piece 35 connected to the ceiling side plate 34 at one end is thermally adhered to the ceiling back plate 31 at the other end, so that the inclined roof portion 30 is formed in a state where the upper end is opened and closed in the circumferential direction. To.

The bottom surface portion 20 is fixed by folding each bottom plate 21 to 24 along the folding line 90 and sealing the bottom surface of the body portion 10 by heat adhesion.

The ejection member 3 inserted into the insertion hole 33a is heat-bonded to the ceiling front plate 33 of the inclined roof portion 30 around the insertion hole 33a. Then, the ceiling front plate 33, the ceiling back plate 31, the ceiling side plate 32, and the ceiling side plate 34 are bent at the folding line 90, and the above-mentioned heat-bonded portions 36 to 42 are formed by heat bonding. As a result, the inclined roof portion 30 is fixed in a state where the top surface of the body portion 10 is closed.

FIG. 6 is a cross-sectional view showing the layer structure of the blank plate 100. The blank plate 100 has an exterior portion 60 and an interior portion 70 that is detachably arranged from the exterior portion 60 on the inner surface side of the exterior portion 60.

In the exterior portion 60, an outer surface adhesive layer 61, a paper base material layer 62, an interlayer adhesive layer 63, and a resin ink 64 are arranged in this order from the outer surface side. An imine-based, urethane-based or acrylic-based anchor coating agent 65 is formed by printing between the outer surface adhesive layer 61 and the paper base material layer 62 and between the paper base material layer 62 and the interlayer adhesive layer 63.

The paper substrate layer 62 is formed of, for example, a paperboard having a basis weight of 382 g / m ² . The outer surface adhesive layer 61 is thermoplastic and is formed of, for example, a low density polyethylene (LDPE) film having a thickness of 25 μm. The outer surface adhesive layer 61 constitutes a heat adhesive layer that heat-bonds the outer surface of the blank plate 100. The outer surface of the outer surface adhesive layer 61 is corona-treated, and the print layer 68 is formed at a predetermined position by gravure printing or offset printing. The interlayer adhesive layer 63 is thermoplastic and is formed of, for example, an ethylene / methacrylic acid copolymer resin (EMAA) film having a thickness of 20 μm. A release layer 79, which will be described later, is adhered onto the paper base material layer 62 by the interlayer adhesive layer 63.

In the interior portion 70, the resin ink 71, the intermediate layer 72, the interlayer adhesive layer 73, and the inner surface adhesive layer 74 are arranged in this order from the outer surface side. An imine-based anchor coating agent 75 is formed by printing between the intermediate layer 72 and the interlayer adhesive layer 73.

The resin ink 64 of the exterior portion 60 and the resin ink 71 of the interior portion 70 form a peelable layer 79 that can be peeled off from each other. The release layer 79 is formed by printing the resin ink 71 and the resin ink 64 on the intermediate layer 72 in this order. The resin ink 71 is formed of, for example, shellac, and the resin ink 64 is formed of, for example, an ethylene-vinyl acetate copolymer resin. The adhesive strength between the resin ink 71 and the resin ink 64 is smaller than the adhesive strength between the other layers of the blank plate 100. As a result, the resin ink 71 and the resin ink 64 are easily peeled off from the blank plate 100. Therefore, the release layer 79 is formed so that the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b can be peeled off.

The release layer 79 may be formed of a water-soluble resin, an emulsion, or the like, and may be arranged between the paper base material layer 62 and the interlayer adhesive layer 63. The release layer 79 dissolves any one of acrylic acid-alkyl acrylate-alkyl methacrylate copolymer, styrene-acrylic acid copolymer, and acrylic acid-alkyl acrylate-alkyl methacrylate-styrene copolymer. It can be formed from acrylic water-soluble resin, emulsion, or the like.

The intermediate layer 72 is formed by arranging the barrier layer 72b on one surface of the barrier base material layer 72a, and the barrier layer 72b is arranged on the outer surface side. The barrier base material layer 72a is formed of, for example, a polyethylene terephthalate (PET) film having a thickness of 12 μm. The barrier layer 72b is formed of a metal vapor deposition film (for example, aluminum vapor deposition film or the like) or an inorganic oxide vapor deposition film (for example, silica vapor deposition film, alumina vapor deposition film or the like). As a result, the barrier layer 72b has a gas barrier property and can prevent oxygen, water vapor, etc. from permeating into the paper container 1. A metal foil such as an aluminum foil may be used as the barrier layer 72b. Further, the barrier layer 72b may be arranged on the inner surface side of the barrier base material layer 72a.

The interlayer adhesive layer 73 has thermoplasticity and is formed of, for example, a low-density polyethylene film having a thickness of 20 μm. The intermediate layer 72 and the inner surface adhesive layer 74 are adhered to each other by the interlayer adhesive layer 73. The inner adhesive layer 74 has thermoplasticity and is formed of, for example, a linear low density polyethylene (LLDPE) film having a thickness of 40 μm polymerized using a metallocene catalyst. The inner surface adhesive layer 74 constitutes a heat adhesive layer that heat-bonds the inner surface of the blank plate 100. The interlayer adhesive layer 73 may be formed by using a resin-based (for example, urethane, acrylic, etc.) two-component curable adhesive used in the dry laminating method or the like.

When the blank plate 100 is bent to form the paper container 1, the opposing inner surface adhesive layers 74, the opposite outer surface adhesive layers 61, and the opposite inner surface adhesive layers 74 and the outer surface adhesive layer 61 are thermally bonded to each other. ..

Although the anchor coating agents 65 and 75 may be omitted, the adhesion between the layers can be improved by providing the anchor coating agents 65 and 75.

The method of forming the paper container 1 will be described below. First, the paper base layer 62 wound up in a roll shape is pulled out, and the anchor coating agent 65 is printed on both sides of the paper base layer 62. Next, using a gravure plate, printing is performed on the barrier layer 72b of the intermediate layer 72 in the order of the resin inks 71 and 64, and the release layer 79 is formed. As a result, the intermediate layer 72 on which the release layer 79 is laminated is formed.

Next, the outer surface adhesive layer 61 is laminated on the outer surface of the paper base material layer 62 by the EC (Extrusion Coating) method. Next, the paper base material layer 62 on which the outer surface adhesive layer 61 is laminated and the release layer 79 laminated on the intermediate layer 72 are bonded to each other via the interlayer adhesive layer 63 by the EC method.

Next, the anchor coating agent 75 is printed on the inner surface of the intermediate layer 72, and the intermediate layer 72 and the inner surface adhesive layer 74 are bonded to each other via the interlayer adhesive layer 73 by the EC method. Next, the outer surface of the outer surface adhesive layer 61 is subjected to corona treatment, and a print layer 68 for drawing a pattern such as a trade name or cutting lines 51 and 52 (see FIG. 5) is formed by gravure printing or offset printing. As a result, a laminated body constituting the blank plate 100 is formed.

Next, the blank plate 100 is punched by punching. At this time, the insertion hole 33a is formed, and the fold line 90 is formed by pressing the ruled line. Next, the glue margin pieces 15, 25, and 35 of the blank plate 100 are subjected to skive hemming processing.

Next, the blank plate 100 is formed into a tubular body whose upper and lower surfaces are opened by frame-sealing the inner surfaces of the back plate 11, the bottom plate 21, and the ceiling back plate 31 and the inner surfaces of the glue margin pieces 15, 25, and 35. .. The tubular body with open upper and lower surfaces is installed in a filling and sealing device equipped with a carton assembly device or the like. The bottom surface 20 is formed by folding the bottom plates 21 to 24 by the filling and sealing device, and the lower surface of the body 10 is closed. Next, the injection member 3 is inserted into the insertion hole 33a and fixed to the inner surface of the blank plate 100 by thermal adhesion. Next, the contents are filled into the body 10 from the upper surface.

Next, the ceiling side plate 32 and the ceiling side plate 34 of the inclined roof portion 30 are bent with respect to the side plate 12 and the side plate 14, respectively, and the upper end portion is folded in half. A release agent 69 is applied to a predetermined area on the outer surface adhesive layer 61 at the upper ends of the ceiling side plate 32 and the ceiling side plate 34. The outer surface adhesive layers 61 of the ceiling side plate 32 and the ceiling side plate 34 facing each other are heat-bonded with a release agent 69 sandwiched therein to form the heat-bonded portions 36 and 37. The release agent 69 is made of one or more resins selected from silicone resin, cellulosic resin, urethane resin, acrylic resin, nitrified cotton and the like, and lowers the adhesive strength of thermal adhesion of the outer surface adhesive layer 61.

At this time, the inner surface adhesive layers 74 in which the upper ends of the ceiling side plate 32 and the ceiling side plate 34 and the upper ends of the ceiling front plate 33 face each other are heat-bonded to form the heat-bonded portions 39 and 40. Similarly, the inner surface adhesive layers 74 in which the upper ends of the ceiling side plate 32 and the ceiling side plate 34 and the upper ends of the ceiling back plate 31 face each other are heat-bonded to form the heat-bonded portions 41 and 42. One end of the ceiling side plate 34 and the glue margin piece 35 are heat-bonded to each other with the inner surface adhesive layers 74 facing each other. Further, the inner surface adhesive layers 74 in which the protruding portions 33b and the protruding portions 31b face each other are heat-bonded to each other to form the heat-bonded portion 38. As a result, the inclined roof portion 30 is formed, the top surface of the body portion 10 is closed, and the paper container 1 shown in FIG. 1 is obtained.

At this time, the adhesive strength between the heat-bonding layers is formed higher than the adhesive strength between the exterior portion 60 and the interior portion 70 (that is, the adhesive strength between the resin ink 71 and the resin ink 64).

The paper container 1 is disassembled after all the contents have been poured out. The dismantling work of the paper container 1 is performed in the order of the first peeling step, the second peeling step, the vertical cutting step, the horizontal cutting step, the dispensing member removing step, and the barrier layer peeling step.

In the first peeling step, as shown by the arrow A1 in FIG. 1, a force is applied in the direction of separating the ceiling front plate 33 and the ceiling back plate 31 by the fingers inserted above the ceiling side plate 34. As a result, the left half of the heat-bonded portion 38 (see FIG. 3) between the ceiling front plate 33 and the ceiling back plate 31 is peeled off, and the heat-bonded portion 37 (see FIG. 4) of the ceiling side plate 34 is peeled off.

Similarly, as shown by the arrow A2 in FIG. 2, a force is applied in the direction away from the ceiling front plate 33 and the ceiling back plate 31 by the fingers inserted above the ceiling side plate 32. As a result, the remaining right half of the heat-bonded portion 38 (see FIG. 3) between the ceiling front plate 33 and the ceiling back plate 31 is peeled off, and the heat-bonded portion 36 (see FIG. 4) of the ceiling side plate 32 is peeled off. Is done. FIG. 7 shows a perspective view of the upper part of the paper container 1 after the first peeling step, and the upper end of the inclined roof portion 30 becomes X-shaped by the first peeling step.

At this time, since the release agent 69 is arranged in the predetermined regions in the heat-bonded portion 36 and the heat-bonded portion 37, the heat-bonded portion 36 and the heat-bonded portion 37 can be easily peeled off. Further, one of the exterior portion 60 and the interior portion 70 of the ceiling front plate 33 and the ceiling back plate 31 is separated by the release layer 79, and the heat-bonded portion 38 can be easily peeled off.

Next, in the second peeling step, the ceiling front plate 33 and the ceiling side plate 32 facing each other are gripped with one hand, and the ceiling back plate 31 and the ceiling side plate 34 facing each other are gripped with the remaining one hand. Then, as shown by the arrow A3 in FIG. 7, both hands are pulled in the direction of separation. As a result, a force is applied in the direction in which the ceiling back plate 31 and the ceiling side plate 32 are separated from each other, and the heat-bonded portion 41 (see FIG. 4) between the ceiling back plate 31 and the ceiling side plate 32 is peeled off. Further, a force is applied in the direction in which the ceiling front plate 33 and the ceiling side plate 34 are separated from each other, and the heat-bonded portion 40 (see FIG. 4) between the ceiling front plate 33 and the ceiling side plate 34 is peeled off.

At this time, one of the exterior portion 60 and the interior portion 70 of the ceiling back plate 31 and the ceiling side plate 32 is separated by the release layer 79, and the heat-bonded portion 41 can be easily peeled off. Further, one of the exterior portion 60 and the interior portion 70 of the ceiling front plate 33 and the ceiling side plate 34 is separated by the release layer 79, and the heat-bonded portion 40 can be easily peeled off.

Similarly, the ceiling front plate 33 and the ceiling side plate 34 facing each other are gripped with one hand, and the ceiling back plate 31 and the ceiling side plate 32 facing each other are gripped with the remaining one hand. Then, as shown by the arrow A4 in FIG. 7, both hands are pulled in the direction of separation. As a result, a force is applied in the direction in which the ceiling front plate 33 and the ceiling side plate 32 are separated from each other, and the heat-bonded portion 39 (see FIG. 4) between the ceiling front plate 33 and the ceiling side plate 32 is peeled off. Further, a force is applied in the direction in which the ceiling back plate 31 and the ceiling side plate 34 are separated from each other, and the heat-bonded portion 42 (see FIG. 4) between the ceiling back plate 31 and the ceiling side plate 34 is peeled off.

At this time, one of the exterior portion 60 and the interior portion 70 of the ceiling front plate 33 and the ceiling side plate 32 is separated by the release layer 79, and the heat-bonded portion 39 can be easily peeled off. Further, one of the exterior portion 60 and the interior portion 70 of the ceiling back plate 31 and the ceiling side plate 34 is separated by the release layer 79, and the heat-bonded portion 42 can be easily peeled off.

FIG. 8 shows a perspective view of the paper container 1 after the second peeling step, and the upper surface of the inclined roof portion 30 is opened by the second peeling step.

Next, in the vertical cutting step, as shown in FIG. 8, a cutting member S such as scissors or a cutter knife is inserted from the upper end of the opened inclined roof portion 30, and vertically along the cutting line 51 to the lower end of the body portion 10. Cut to. Next, in the lateral cutting step, the cutting member S cuts the lower end portion of the body portion 10 in the circumferential direction along the cutting line 52. As a result, the bottom surface portion 20 is separated from the body portion 10, and the paper container 1 is cut open as shown in FIG. In the vertical cutting step and the horizontal cutting step, the paper container 1 may be cut open by breaking the blank plate 100 on the folding line 90 with a finger.

Next, in the pouring member removing step, the boundary (folding line 90) between the left and right ends and the lower ends of the ceiling front plate 33 is cut by the cutting member S. As a result, the ceiling front plate 33 and the dispensing member 3 are separated from the body portion 10. The dispensing member 3 may be separated by cutting the periphery of the dispensing member 3 on the ceiling front plate 33. Alternatively, the ceiling front plate 33 may be separated by breaking the blank plate 100 on the folding line 90 with a finger.

Next, in the barrier layer peeling step, the interior portion 70 including the barrier layer 72b of the developed paper container 1 and the exterior portion 60 including the paper base material layer 62 are peeled on the peeling layer 79. The release layer 79 can easily separate the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b.

As a result, the paper container 1 is disassembled, and the exterior portion 60 including the paper base material layer 62 provided on the inclined roof portion 30 and the body portion 10 is recycled. Further, the interior portion 70 including the barrier layer 72b provided on the inclined roof portion 30 and the body portion 10 is discarded, and the injection member 3 and the bottom surface portion 20 are discarded.

According to the present embodiment, the upper ends of the ceiling side plates 32 and 34 of the inclined roof portion 30 are provided with thermal adhesive portions 36 and 37 (first adhesive portions) which are folded in half and heat-bonded to the outer surface adhesive layers 61 which face each other. Be done. A release agent 69 that reduces the adhesive strength of the outer surface adhesive layer 61 is provided in a predetermined region on the outer surface adhesive layer 61 of the heat adhesive portions 36 and 37.

Further, a heat-bonding portion 38 (second bonding portion) in which the inner surface adhesive layers 74 are heat-bonded to each other is provided at the upper ends of the ceiling front plate 33 and the ceiling back plate 31. Thermally bonded portions 39 and 40 (third bonded portions) in which the inner surface adhesive layers 74 are thermally bonded to each other are provided at the upper ends of the ceiling side plates 32 and 34 and the ceiling front plate 33. Thermally bonded portions 41 and 42 (fourth bonded portions) in which the inner surface adhesive layers 74 are thermally bonded to each other are provided at the upper ends of the ceiling side plates 32 and 34 and the ceiling back plate 31. A peeling layer 79 that can be peeled off between the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b at the upper ends of the ceiling front plate 33, the ceiling back plate 31, and the ceiling side plates 32, 34. Is provided.

When the paper container 1 is disassembled, the heat-bonded portions 36, 37 and the heat-bonded portion 38 are peeled off in the first peeling step, and the heat-bonded portions 39, 40 and the heat-bonded portions 41, 42 are pulled in the second peeling step. It will be peeled off. The heat-bonded portions 36 to 42 are easily peeled off by the release agent 69 and the release layer 79, and the upper end of the inclined roof portion 30 can be easily opened.

Further, the cutting member S is inserted from the upper end of the inclined roof portion 30 opened in the vertical cutting step and cut in the vertical direction to the lower end portion of the body portion 10, and the lower end portion of the body portion 10 is cut in the circumferential direction by the horizontal cutting step. .. Then, the pouring member is separated in the pouring member removing step.

As a result, the paper container 1 can be easily cut open and disassembled because the injection member 3 of the resin molded product is not cut by inserting scissors from the injection port as in the conventional example. Therefore, the recyclability of the paper container 1 can be improved.

Further, the peeling layer 79 is arranged on the entire surface, and a barrier layer peeling step is provided on the peeling layer 79 to peel off the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b. As a result, the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b can be separated to improve the recyclability of the paper container 1.

Further, a cutting line 51 (first cutting line) is drawn from the upper end of the inclined roof portion 30 along the glue margin pieces 35 and 15, and a cutting line 52 (second cutting line) is drawn at the lower end of the body portion 10. .. As a result, the paper container 1 can be easily cut in the vertical cutting step and the horizontal cutting step.

Further, since the release layer 79 is composed of a laminate of ethylene-vinyl acetate copolymer resin and shellac, it can be separated between the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b. The peeling layer 79 can be easily realized.

In the present embodiment, the peeling layer 79 on the body portion 10 and the bottom surface portion 20 may be omitted, and the peeling layer 79 may be provided only on the inclined roof portion 30. Further, the release layer 79 may be provided only on the upper end portion of the inclined roof portion 30 on which the heat-bonded portions 36 to 42 are formed. As a result, the cost of the paper container 1 can be reduced, and the inclined roof portion 30 can be easily opened in the first peeling step and the second peeling step. Therefore, the release layer 79 may be provided at least in the region where the heat-bonded portions 38 to 42 at the upper ends of the ceiling front plate 33, the ceiling back plate 31, and the ceiling side plates 32, 34 are formed.

When the release layer 79 is provided only on the upper end of the inclined roof portion 30, it is preferable to provide the release layer 79 from the upper end of the inclined roof portion 30 to the lower end of the heat-bonded portions 36 to 42 below the folding line 90. As a result, even if the formation position of the release layer 79 is displaced, the release layer 79 can be reliably arranged on the heat-bonded portions 36 to 42.

At this time, the distance E (see FIG. 5) from the folding line 90 at the lower ends of the heat-bonded portions 36 to 42 to the lower end of the release layer 79 may be formed to be 10 mm or less. It is more desirable to form the distance E to 5 mm or less because the cost reduction effect is high.

<Second Embodiment>
FIG. 10 shows a developed view of the blank plate 100 of the paper container 1 of the second embodiment. In this embodiment, the ceiling back plate 31 and the ceiling front plate 33 are provided with opening start portions 31c and 33c and chamfers 31f and 33f as compared with the first embodiment. Other parts are the same as those in the first embodiment.

The opening start portions 31c and 33c are provided at both side ends of the projecting portions 31b of the ceiling back plate 31 and at both side ends of the projecting portions 33b of the ceiling front plate 33. The opening start portions 31c and 33c are formed by cutting the blank plate 100 in the horizontal direction (I notch). The opening start portions 31c and 33c may be formed by a notch (V notch) obtained by cutting the blank plate 100 into a V shape.

The opening start portions 31c and 33c are formed one or more within a range of 3 mm or less upward from the intersection P of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 and the protrusions 31b and 33b. It is more desirable to provide the opening start portions 31c and 33c on the intersection P. Further, the lengths of the opening start portions 31c and 33c in the horizontal direction are formed to be 5 mm or less. As a result, it is possible to prevent the paper container 1 from being deteriorated in appearance.

Chamfers 31f and 33f are provided at the upper ends of both side ends of the protruding portion 31b of the ceiling back plate 31 and the protruding portion 33b of the ceiling front plate 33. Similarly, a chamfer 35f is provided at the upper end of one side end of the glue margin piece 35. The chamfers 31f, 33f, and 35f reduce the bonding area of the heat-bonded portions 38 of the protrusions 31b and 33b, and both side ends of the heat-bonded parts 38 can be easily peeled off. The chamfers 31f, 33f, and 35f may be formed linearly or curvedly.

The lower ends of the chamfers 31f, 33f, and 35f are formed in a range of 2 mm or less upward from the intersection P of the upper end surfaces 32d, 34d of the ceiling side plates 32, 34 and the protrusions 31b and 33b. As a result, the bonding area at both end portions of the heat bonding portion 38 can be reliably reduced. It is more desirable to provide the lower ends of the chamfers 31f, 33f, and 35f on the intersection P.

The horizontal length L1 of the chamfers 31f, 33f, and 35f is 3 mm or more and is formed to be 1/2 or less of the width of the ceiling back plate 31 and the ceiling front plate 33. As a result, the bonding area at both end portions of the heat bonding portion 38 can be reliably reduced. It is more desirable to form the length L1 to 5 mm to 20 mm.

In the first peeling step of disassembling the paper container 1 having the above configuration, since the distance between the ceiling side plates 32 and 34 and the opening start portions 31c and 33c is small in the side end portion of the heat bonding portion 38, the opening start portion 31c, from below, It can be easily peeled off up to 33c. Then, the protruding portion 31b and the protruding portion 33b are separated from each other while the inner surface adhesive layer 74 and the barrier base material layer 72a of the protruding portion 31b and the protruding portion 33b are torn from the opening start portions 31c and 33c.

At this time, since the chamfers 31f, 33f, and 35f are provided, the bonding area of both end portions of the heat bonding portion 38 is small, and the protruding portion 31b and the protruding portion 33b can be easily separated. As a result, a part of the paper base material layer 62 of one of the protrusions 31b and 33b is separated in the stacking direction and peeled off integrally with the other. Therefore, the heat-bonded portion 38 can be easily peeled off.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the opening start portions 31c and 33c formed by the notches or notches of the blank plate 100 are provided at both side ends of the protruding portions 31b and 33b, the heat-bonded portion 38 (second adhesive portion) can be easily provided in the first peeling step. Can be peeled off.

Further, since the opening start portions 31c and 33c are provided in a range of 3 mm above the intersection P, the opening start portions 31c and 33c can be easily peeled off from below. Further, since the lengths of the opening start portions 31c and 33c in the horizontal direction are set to 5 mm or less, it is possible to prevent the paper container 1 from being deteriorated in appearance.

The opening start portions 31c and 33c can be easily formed by cutting the blank plate 100 (I notch) or notch (V notch). At this time, the opening start portions 31c and 33c may at least penetrate the inner surface adhesive layer 74 and the barrier base material layer 72a. As a result, the interior portion 70 is torn apart and the paper base material layer 62 is separated in the stacking direction, so that the heat-bonded portion 38 can be easily peeled off.

Further, either the opening start portion 31c or the opening start portion 33c may be omitted. Further, the opening start portion 31c at one side end of the protruding portion 31b may be omitted, and the opening start portion 33c at the other side end of the protruding portion 33b may be omitted. That is, the opening start portion may be provided at one or both side ends of the pair of protrusions 31b and 33b, and may be provided at one or both other side ends of the protrusion 31b and the protrusion 33b.

Further, since chamfers 31f and 33f are provided on both side ends of the protruding portions 31b and 33b, the bonding area of both side ends of the heat bonding portion 38 can be reduced and both side ends of the heat bonding portion 38 can be easily peeled off. Can be done.

Further, since the lower ends of the chamfers 31f and 33f are formed in a range of 2 mm or less upward from the intersection P, the bonding area at both end portions of the heat bonding portion 38 can be reliably reduced. Further, since the horizontal lengths L1 of the chamfers 31f, 33f, and 35f are formed to be 3 mm or more and less than 1/2 the width of the ceiling back plate 31 and the ceiling front plate 33, both end portions of the heat bonding portion 38 are bonded. The area can be surely reduced.

Either the chamfer 31f or the chamfer 33f may be omitted. Further, the chamfering 31f at one side end of the protruding portion 31b may be omitted, and the chamfering 33f at the other side end of the protruding portion 33b may be omitted. That is, the chamfer may be provided at one or both side ends of the pair of protrusions 31b and 33b, and may be provided at one or both other side ends of the protrusions 31b and 33b. However, as shown in the present embodiment, it is more desirable to provide chamfers 31f, 33f, and 35f on both side ends of the protruding portion 31b, both side ends of the protruding portion 33b, and the glue margin piece 35, respectively. As a result, it is possible to prevent the chamfered portions from facing each other and deteriorating the aesthetic appearance of the paper container 1.

In the present embodiment, the opening start portions 31c and 33c may be omitted. Further, in the present embodiment, chamfering 31f, 33f, 35f may be omitted.

<Third Embodiment>
Next, FIG. 11 shows a developed view of the blank plate 100 of the paper container 1 of the third embodiment. In this embodiment, the shapes of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are different from those in the first embodiment, and the opening auxiliary portions 32c and 34c are provided. Further, the same opening start portions 31c and 33c as in the second embodiment are provided. Other parts are the same as those in the first embodiment.

The upper end surface 32d of the ceiling side plate 32 has a pair of inclined portions 32e inclined linearly from both side ends toward the center, and is formed as a concave surface with both side ends as the uppermost points. The upper end surface 34d of the ceiling side plate 34 has a pair of inclined portions 34e inclined linearly from both side ends toward the center, and is formed as a concave surface with both side ends as the uppermost points.

The distance F from the lower ends of the inclined portions 32e and 34e to the folding line 90 at the lower ends of the heat-bonded portions 36 and 37 is formed to be 5 mm or more. Thereby, leakage of the contents can be prevented.

The protruding portions 33b and 31b at the upper ends of the ceiling front plate 33 and the ceiling back plate 31 project upward from the uppermost points of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34. The inclined portions 32e and 34e may be formed in a curved shape. Further, a horizontal portion may be provided between the pair of inclined portions 32e, or a horizontal portion may be provided between the pair of inclined portions 34e.

When the same device as in the first embodiment is used when assembling the paper container 1, the heat-bonding portion 38 pressurizes the same region as in the first embodiment and is heat-bonded. Therefore, the non-adhesive portions 33d and 31d in which the ceiling front plate 33 and the ceiling back plate 31 are not adhered are formed between the heat-bonded portion 38 and the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34. As a result, the adhesive area of the adhesive portions 39 to 42 becomes narrow. Further, the bonding area of the heat-bonding portions 36 and 37 of the ceiling side plates 32 and 34 is narrowed.

Further, the opening start portions 31c and 33c provided at both side ends of the protruding portion 31b and the protruding portion 33b are arranged on the non-adhesive portions 31d and 33d.

A plurality of opening assisting portions 32c and 34c are arranged side by side in the horizontal direction at the upper ends of the ceiling side plates 32 and 34. The opening auxiliary portions 32c and 34c are formed by cutting the blank plate 100 in the vertical direction (I notch). The opening auxiliary portions 32c and 34c may be formed by a notch (V notch) obtained by cutting the blank plate 100 into a V shape.

The length of the opening assisting portions 32c and 34c in the vertical direction is formed to be 5 mm or less. As a result, it is possible to prevent the paper container 1 from being deteriorated in appearance.

In the first peeling step of disassembling the paper container 1 having the above configuration, the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are concave surfaces, so that the adhesive areas of the heat-bonded portions 36 and 37 and the heat-bonded portions 39 to 42 are small. Further, the heat-bonded portions 36 and 37 are peeled off in order between the plurality of opening auxiliary portions 32c and 34c. Therefore, the heat-bonded portions 36 and 37 can be easily peeled off.

Further, the protruding portion 33b and the protruding portion 31b are separated from each other while the inner surface adhesive layer 74 and the barrier base material layer 72a of the protruding portion 33b and the protruding portion 31b are torn from the opening start portions 31c and 33c. Therefore, the heat-bonded portion 38 can be easily peeled off.

Further, in the second peeling step, the heat-bonded portions 39 to 42 are peeled off in order between the plurality of opening auxiliary portions 32c and 34c. Therefore, the heat-bonded portions 39 to 42 can be easily peeled off.

Table 1 shows the results of examining the tensile force required in the second peeling step of the paper container 1 of the first embodiment and the third embodiment by a tensile test. Table 2 shows the results of a sensory test conducted by five testers on the ease of opening the paper container 1 of the third embodiment during the first peeling step and the second peeling step.

In Tables 1 and 2, the test piece 1 was formed of the paper container 1 of the first embodiment, and the test piece 2 was formed of the paper container 1 of the third embodiment. In the test piece 2, the opening start portions 33c and 31c and the opening auxiliary portions 32c and 34c were formed by notches having a length of 2 mm, and the opening auxiliary portions 32c and 34c were provided at eight locations. In the comparative example, the release layer 79 is omitted from the test piece 1. Further, the test piece 1, the test piece 2, and the comparative example were assembled by the same apparatus.

The tensile speed of the tensile test is 300 mm. In the sensory test, the case where it is easy to open is indicated by "○", the case where it is difficult to open is indicated by "x", and the case where neither can be said is indicated by "Δ".

According to Table 1, by providing the release layer 79, the heat-bonded portions 39 to 42 can be peeled off with a smaller tensile force during the second peeling step as compared with the case where the release layer 79 is not provided. Further, if the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are formed as concave surfaces and the opening auxiliary portions 32c and 34c are provided, the heat-bonded portions 39 to 42 can be peeled off with a smaller tensile force.

According to Table 2, the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are formed in a concave surface, and the release layer 79, the opening start portions 33c and 31c and the opening auxiliary portions 32c and 34c are provided to provide the first peeling step and It can be easily opened in the second peeling step.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the opening start portions 31c and 33c formed by the notches or notches of the blank plate 100 are provided at both side ends of the protruding portions 31b and 33b, the heat-bonded portion 38 (second adhesive portion) can be easily provided in the first peeling step. Can be peeled off.

Further, since the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are formed on the concave surface having both side ends as the uppermost points, the heat bonding portion 36 does not increase the bonding strength of both side ends of the heat bonding portion 38. , 37 can reduce the adhesive strength. Therefore, the heat-bonded portions 36 and 37 (first bonded portion) can be easily peeled off in the first peeling step. The upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 may be formed by a horizontal plane.

Further, since the non-adhesive portions 31d and 33d are provided between the heat-bonded portions 38 and the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34, the opening start portions 31c and 33c are arranged on the non-adhesive portions 31d and 33d. , The heat-bonded portion 38 can be peeled off more easily in the first peeling step.

Further, since a plurality of opening assisting portions 32c and 34c composed of notches or notches of the blank plate 100 are provided at the upper ends of the ceiling side plates 32 and 34, the heat-bonded portions 36 and 37 can be more easily provided in the first peeling step. It can be peeled off. In addition, the heat-bonded portions 39 to 42 (third bonded portion and fourth bonded portion) can be easily peeled off in the second peeling step. The opening auxiliary portions 32c and 34c may be provided in the forming region of the release agent 69. As a result, the heat-bonded portions 39 to 42 can be more easily peeled off in the second peeling step.

The opening auxiliary portions 32c and 34c can be easily formed by cutting the blank plate 100 (I notch) or notch (V notch). At this time, the opening auxiliary portions 32c and 34c may at least penetrate the inner surface adhesive layer 74 and the barrier base material layer 72a. As a result, the interior portion 70 is torn apart and the paper base material layer 62 is separated in the stacking direction, so that the heat-bonded portions 36, 37 and the heat-bonded portions 39 to 42 can be easily peeled off.

In this embodiment, chamfers 31f, 33f, 35f similar to those in the second embodiment may be provided.

<Fourth Embodiment>
Next, FIG. 12 shows a developed view of the blank plate 100 of the paper container 1 of the fourth embodiment. This embodiment is different from the third embodiment in the structures of the opening start portions 31c and 33c and the opening assist portions 32c and 34c. Other parts are the same as those in the third embodiment.

The opening start portions 31c and 33c are formed by a large number of dot-shaped pores 81 (see FIG. 13), and are provided in the rectangular regions of the protruding portions 33b and the both end portions of the protruding portions 31b. The lower ends of the opening start portions 31c and 33c are formed on the intersection P of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 and the protrusions 31b and 33b. The lower ends of the opening start portions 31c and 33c may be formed on the boundary line between the ceiling back plate 31 and the back plate 11 and on the boundary line between the ceiling front plate 33 and the front plate 13.

Similarly, the opening auxiliary portions 32c and 34c are formed by a large number of dot-shaped pores 81 (see FIG. 13), and are provided in rectangular regions at both side ends of the ceiling side plates 32 and 34. The lower ends of the opening assisting portions 32c and 34c may be formed on the boundary line between the ceiling back plate 31 and the back plate 11 and on the boundary line between the ceiling front plate 33 and the front plate 13.

FIG. 13 is a cross-sectional view showing a layer structure of the blank plate 100 on the opening start portion 33c. On the inner surface of the blank plate 100, pores 81 forming dots at the opening start portion 33c are engraved by a roller having a large number of needles. The pores 81 reach from the inner surface of the blank plate 100 to the middle of the paper base material layer 62, and penetrate the inner surface adhesive layer 74 and the barrier base material layer 72a. Dot-shaped pores of the opening start portion 31c and the opening auxiliary portions 32c and 34c are also formed in the same manner.

Similar to the third embodiment, the heat-bonded portion 38 (second bonded portion) can be easily peeled off in the first peeling step by the opening start portions 31c and 33c composed of the plurality of pores 81.

Further, the heat-bonded portions 36 and 37 (first bonded portions) can be easily peeled off in the first peeling step by the opening auxiliary portions 32c and 34c composed of the plurality of pores 81. In addition, the heat-bonded portions 39 to 42 (third bonded portion and fourth bonded portion) can be easily peeled off in the second peeling step. The pores 81 may penetrate the blank plate 100.

Further, a large number of pores 81 may be provided in a continuous band shape at the upper ends of the ceiling front plate 33, the ceiling back plate 31, and the ceiling side plates 32, 34. As a result, the opening start portions 31c and 33c and the opening auxiliary portions 32c and 34c can be easily formed when the blank plate 100 is formed. At this time, the strip-shaped pores 81 may be arranged on the entire surface above the folding line 90 at the lower end of the heat-bonded portions 39 to 42. Further, the lower ends of the band-shaped pores 81 may be arranged above the folding lines 90 at the lower ends of the heat-bonded portions 39 to 42 at predetermined intervals. As a result, the lower ends of the heat-bonded portions 39 to 42 facing the inside of the paper container 1 become non-formed regions of the pores 81, and it is possible to prevent deterioration of the sealing property of the paper container 1.

In this embodiment, chamfers 31f, 33f, 35f similar to those in the second embodiment may be provided.

According to the present invention, it can be used for a Goebel top type paper container provided with a pouring member.

1 Paper container 2 Main body 3 Injection member 10 Body 11 Back plate 12, 14 Side plate 13 Front plate 15, 25, 35 Glue allowance piece 20 Bottom part 21 to 24 Bottom plate 30 Inclined roof part 31 Ceiling back plate 31b, 33b Protruding parts 31c, 33c Opening start parts 31d, 33d Non-adhesive parts 31f, 33f, 35f Chamfering 32, 34 Ceiling side plates 32c, 34c Opening auxiliary parts 32d, 34d Top surface 33 Ceiling front plate 33a Insertion holes 36, 37 Thermal bonding Part (first adhesive part)
38 Thermal adhesive part (second adhesive part)
39, 40 Thermal adhesive part (3rd adhesive part)
41, 42 Thermal adhesive part (4th adhesive part)
51, 52 Cutting line 60 Exterior part 61 Outer surface adhesive layer 62 Paper base material layer 63 Interlayer adhesive layer 64, 71 Resin ink 65 Anchor coating agent 68 Printing layer 69 Release agent 70 Interior part 72 Intermediate layer 72a Barrier base material layer 72b Barrier layer 73 Interlayer adhesive layer 74 Inner surface adhesive layer 75 Anchor coating agent 79 Peeling layer 81 Pore 90 Folded line 100 Blank plate S Cutting member

Claims (19)

From the outer surface side, from the outer surface adhesive layer having thermoplasticity, the paper base material layer made of paper, the barrier base material layer in which the barrier layer having gas barrier property is arranged on one surface, and the blank plate in which the inner surface adhesive layer having thermoplasticity is laminated. A tubular body having a rectangular cross section, an inclined roof portion that closes the top surface of the body portion, a bottom surface portion that closes the bottom surface of the body portion, and a resin injection member attached to the inclined roof portion. In the method of disassembling a Goebel top type paper container equipped with
A pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and an upper end portion of the ceiling side plate, with the inclined roof portion inclined and facing each other in the front-rear direction. A first adhesive portion that is folded in half and bonded by the outer surface adhesive layer, and a pair of protruding portions that project upward from the ceiling side plate and are provided on the ceiling front plate and the ceiling back plate, respectively, are formed on the inner surface adhesive layer. The second adhesive portion bonded to each other by the above, the third adhesive portion in which the ceiling side plate and the upper end portion of the ceiling front plate are bonded to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling back plate. It has a fourth adhesive portion that is bonded to each other by the inner surface adhesive layer.
At the upper ends of the ceiling front plate, the ceiling back plate, and the ceiling side plate, a peeling layer that allows both to be peeled off is arranged between the paper base material layer and the barrier layer, and the ceiling side plate A release agent that reduces the adhesive strength of the outer surface adhesive layer is arranged in a predetermined area on the outer surface adhesive layer at the upper end portion.
A first peeling step of peeling off the first adhesive portion and the second adhesive portion by applying a force in a direction in which the ceiling front plate and the ceiling back plate are separated from each other.
A force is applied in the direction in which the ceiling front plate and the ceiling side plate are separated to peel off the third adhesive portion, and a force is applied in the direction in which the ceiling back plate and the ceiling side plate are separated to pull the fourth adhesive portion. The second peeling step to peel off and
A vertical cutting step of cutting from the upper end of the inclined roof portion opened by the first peeling step and the second peeling step to the lower end of the body portion in the vertical direction.
A lateral cutting step of cutting the lower end portion of the body portion in the circumferential direction to separate the bottom surface portion.
A step of removing the pouring member by cutting a predetermined area of the slanted roof portion and separating at least the pouring member.
At least penetrates the inner surface adhesive layer and the barrier base material layer through one or both unilateral ends of the pair of the protrusions and one or both other side ends of the pair of the protrusions. An opening start part is provided,
A non-adhesive non-adhesive portion is provided between the ceiling front plate and the ceiling back plate between the second adhesive portion and the upper end surface of the ceiling side plate, and the opening start portion is placed on the non-adhesive portion. A method of disassembling a paper container, which is characterized by being placed in a ceiling . The peeling layer is provided on the entire surface between the barrier layer and the paper base material layer, and a barrier layer peeling step for peeling the barrier layer and the paper base material layer on the peeling layer is provided. The method for disassembling a paper container according to claim 1. The method for disassembling a paper container according to claim 1 or 2 , wherein chamfering is provided at both end portions of the protruding portion. The method for disassembling a paper container according to any one of claims 1 to 3 , wherein the upper end surface of the ceiling side plate is a concave surface having both end points as the uppermost points. The method for disassembling a paper container according to any one of claims 1 to 3 , wherein the upper end surface of the ceiling side plate is a horizontal plane. The paper container according to any one of claims 1 to 5 , wherein at least a plurality of opening assisting portions penetrating the inner surface adhesive layer and the barrier base material layer are provided at the upper end portion of the ceiling side plate. How to dismantle. The body portion and the inclined roof portion are configured in a state of being closed in the circumferential direction by adhesion of the glue margin piece provided at the end of the blank plate, and the cutting position of the vertical cutting step is shown along the glue margin piece. The paper according to any one of claims 1 to 6 , wherein a first cutting line is drawn and a second cutting line indicating a cutting position of the lateral cutting step is drawn at the lower end portion of the body portion. How to disassemble the container. A paper container according to any one of claims 1 to 7 , wherein the paper container is used in the method of disassembling the paper container. From the outer surface side, from the outer surface adhesive layer having thermoplasticity, the paper base material layer made of paper, the barrier base material layer in which the barrier layer having gas barrier property is arranged on one surface, and the blank plate in which the inner surface adhesive layer having thermoplasticity is laminated. A tubular body having a rectangular cross section, an inclined roof portion that closes the top surface of the body portion, a bottom surface portion that closes the bottom surface of the body portion, and a resin injection member attached to the inclined roof portion. In a Goebel top type paper container equipped with
A pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and an upper end portion of the ceiling side plate, with the inclined roof portion inclined and facing each other in the front-rear direction. A first adhesive portion that is folded in half and bonded by the outer surface adhesive layer, and a pair of protruding portions that project upward from the ceiling side plate and are provided on the ceiling front plate and the ceiling back plate, respectively, are formed on the inner surface adhesive layer. The second adhesive portion bonded to each other by the above, the third adhesive portion in which the ceiling side plate and the upper end portion of the ceiling front plate are bonded to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling back plate. It has a fourth adhesive portion that is bonded to each other by the inner surface adhesive layer.
At the upper ends of the ceiling front plate, the ceiling back plate, and the ceiling side plate, a peeling layer that allows both to be peeled off is arranged between the paper base material layer and the barrier layer, and the ceiling side plate A release agent that reduces the adhesive strength of the outer surface adhesive layer is arranged in a predetermined area on the outer surface adhesive layer at the upper end portion .
An opening start portion that penetrates at least the inner surface adhesive layer and the barrier base material layer at one side end portion of one or both of the pair of protrusions and one or both other side ends of the pair of protrusions. And
A non-adhesive non-adhesive portion is provided between the ceiling front plate and the ceiling back plate between the second adhesive portion and the upper end surface of the ceiling side plate, and the opening start portion is placed on the non-adhesive portion. A paper container characterized by being placed in the ceiling. The paper container according to claim 9 , wherein the opening start portion is composed of pores provided on the blank plate. The paper container according to claim 9 , wherein the opening start portion comprises a notch or a notch obtained by cutting the blank plate. The paper container according to any one of claims 9 to 11 , wherein chamfers are provided at the upper ends of both side ends of the protruding portion. The paper container according to claim 12 , wherein the lower end of the chamfer is arranged within 2 mm above the intersection of the upper end surface of the ceiling side plate and the protruding portion. The paper container according to any one of claims 9 to 13 , wherein the upper end surface of the ceiling side plate is a concave surface having both side ends as the uppermost points. The paper container according to any one of claims 9 to 13 , wherein the upper end surface of the ceiling side plate is a horizontal plane. The paper container according to any one of claims 9 to 15 , wherein at least a plurality of opening assisting portions penetrating the inner surface adhesive layer and the barrier base material layer are provided at the upper end portion of the ceiling side plate. .. The paper container according to claim 16 , wherein the opening assisting portion includes pores provided on the blank plate. The paper container according to claim 16 , wherein the opening assisting portion comprises a notch or a notch obtained by cutting the blank plate. The body portion and the inclined roof portion are configured in a state of being closed in the circumferential direction by adhesion of glue margin pieces provided at the ends of the blank plate, and a first cutting line extending vertically along the glue margin piece is drawn. The paper container according to any one of claims 9 to 18 , wherein a second cutting line extending in the circumferential direction is drawn at the lower end of the body portion.

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