JP2018122930A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container that can be disassembled easily and a method of disassembling the paper container.SOLUTION: An outer surface adhesive layer 61 having thermoplasticity, a paper base material layer 62 made of paper, and an inner surface adhesion layer 74 having thermoplasticity are laminated in this order from the outer surface side, and a blank plate 100 provided with a barrier layer 72b having gas barrier property on the inner surface of the paper base material layer 62, a cylindrical body section 10 having a rectangular cross section, an inclined roof section 30 closing the top surface of the body section 10, and a bottom section 20 for covering the bottom surface of the body section 10, the barrier layer 72b is composed of a coating film.SELECTED DRAWING: Figure 29

Description

  The present invention relates to a paperbell top type paper container provided with a pouring member.

  Japanese Patent Application Laid-Open No. 2004-133867 discloses a conventional gobbel-top type paper container used for packaging alcoholic beverages and beverages. This paper container is formed by bending a blank plate in which an outer surface adhesive layer is laminated on the outer surface of a paper base material layer, and a barrier layer and an inner surface adhesive layer are laminated in 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 reduction of the contents.

  In addition, the upper and lower surfaces of the cylindrical body portion of the paper container are closed by the inclined roof portion and the bottom surface portion, respectively. A pouring member of a resin molded product forming a pouring port is attached to the inclined roof portion.

  In recent years, due to increasing environmental problems, when empty containers after use are discarded, the empty containers are dismantled and sorted for each type of component or reduced in volume to be recycled. In the paper container, the upper end portion of the inclined roof portion is firmly heat-bonded in order to prevent leakage of the liquid contents. For this reason, scissors are inserted from the spout when the paper container is disassembled, and the paper container is opened and recycled.

Japanese Unexamined Patent Publication No. 09-226752 (pages 2 to 4 and FIG. 2)

  However, according to the above conventional paper bell top type paper container, since the pouring member forming the pouring port is made of resin, it is difficult to cut with scissors. For this reason, the paper container cannot be easily disassembled, and there is a problem that the recyclability of the paper container is poor.

  An object of this invention is to provide the paper container which can improve recyclability.

In order to achieve the above object, the present invention, in order from the outer surface side, laminates an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, and an inner surface adhesive layer having thermoplasticity, and the inner surface of the paper base material layer. A blank plate provided with a barrier layer having a gas barrier property, a cylindrical trunk portion having a rectangular cross section, an inclined roof portion covering the top surface of the trunk portion, and a bottom portion closing the bottom surface of the trunk portion. In the equipped paperbell type paper container,
The barrier layer is made of a coating film.

Further, the present invention is a paper container having the above-described configuration, wherein the coating amount of the coating film is 10 g / m ² or more.

  Further, the present invention is a paper container having the above-described configuration, wherein the coating film is made of any one of PVA, zinc acrylate, alumina phosphate, and TEOS.

  Further, the present invention is a paper container having the above-described configuration, wherein the inclined roof portion is connected to the ceiling front plate and the ceiling back plate that are inclined and face each other, and the left and right pair connecting the ceiling front plate and the ceiling back plate. A ceiling side plate, a first adhesive portion in which an upper end portion of the ceiling side plate is folded in two and adhered by the outer surface adhesive layer, and the ceiling front plate and the ceiling rear plate protruding above the ceiling side plate. A second adhesive portion in which a pair of protrusions provided on each other are adhered to each other by the inner surface adhesive layer, and a third adhesive portion in which upper ends of the ceiling side plate and the ceiling front plate are adhered to each other by the inner surface adhesive layer, A fourth adhesive portion in which upper end portions of the ceiling side plate and the ceiling back plate are bonded to each other by the inner surface adhesive layer, and in the ceiling front plate, upward from both side ends of the lower portion of the ceiling front plate The closer you are to each other A pair of front inclined fold lines are provided, and a pair of back inclined fold lines are provided in the ceiling back plate so as to be closer to each other as they go upward from both side ends of the lower portion of the ceiling back plate. It is characterized by that.

  Further, the present invention is a paper container having the above-described configuration, wherein the body portion includes a pair of side plates disposed below the ceiling side plate, and the center portion in the horizontal direction of the ceiling side plate and the side plate is provided. A side fold line extending in the vertical direction is provided.

  Further, the present invention is a paper container having the above-described configuration, wherein the side fold line is divided at a boundary between the ceiling side plate and the side plate.

  Moreover, the present invention is a paper container having the above-described configuration, and is characterized in that a first notch is provided in a central portion of the upper end surface of the ceiling back plate.

  Further, the present invention is a paper container having the above-described configuration, and is characterized in that a second notch is provided in a central portion of the upper end surface of the ceiling front plate.

  Further, the present invention is a paper container having the above-described configuration, and is characterized in that a third notch is provided at the center of the upper end surface of the pair of ceiling side plates.

  Further, the present invention is a paper container having the above-described configuration, and in the second adhesive portion, the protruding portion includes a plurality of inner end surfaces of the inner surface adhesive layer and intermediate portions in the thickness direction of the paper base material layer. It is characterized by the formation of scratches.

  Further, the present invention is a paper container having the above-described configuration, wherein a plurality of the scratches are formed on the ceiling side plate and the ceiling front plate at the upper end portion of the third bonding portion, and at the upper end portion of the fourth bonding portion. A large number of the scratches are formed on the ceiling side plate and the ceiling back plate.

Further, the present invention is an application in which an outer surface adhesive layer having thermoplasticity, a paper base layer made of paper, and an inner surface adhesive layer having thermoplastic properties are laminated in order from the outer surface side, and gas barrier properties are applied to the inner surface of the paper base material layer. It is composed of a blank plate provided with a barrier layer made of a film, and has a cylindrical 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 the inclination In the dismantling method of the paper bell type paper container provided with a resin pouring member attached to the roof part,
The inclined roof portion is inclined to face the front and back of the ceiling front plate and the ceiling rear plate, the pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and the upper end of the ceiling side plate A first adhesive portion that is folded in two and adhered by the outer surface adhesive layer, and a pair of protrusion portions that protrude above the ceiling side plate and are provided on the ceiling front plate and the ceiling rear plate, respectively. A second adhesive portion bonded to each other, a third adhesive portion in which upper end portions of the ceiling side plate and the ceiling front plate are bonded to each other by the inner surface adhesive layer, and upper end portions of the ceiling side plate and the ceiling back plate. A fourth adhesive portion adhered to each other by the inner surface adhesive layer,
A first peeling step of peeling the first adhesive part and the second adhesive part by applying a force in a direction in which the ceiling front plate and the ceiling back plate are separated;
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 a direction in which the ceiling back plate and the ceiling side plate are separated to pull the fourth adhesive portion. A second peeling step to peel off;
It is characterized by having.

  Further, the present invention is a method for disassembling a paper container having the above-described configuration, wherein the body portion includes a pair of side plates disposed below the ceiling side plate, and the ceiling side plate and the side plate are arranged in a horizontal direction. The method further comprises a folding step of folding the ceiling side plate and the side plate in half along a side fold line extending in the vertical direction through the center, and the first peeling step is performed after the folding step. It is said.

  Further, the present invention is a method for disassembling a paper container having the above-described configuration, wherein, in the second adhesive portion, the protruding portion has an inner end surface of the inner surface adhesive layer and an intermediate portion in the thickness direction of the paper base material layer as both ends. It is characterized by having a large number of scratches.

  Further, the present invention is a method for disassembling a paper container having the above-described configuration, and cuts in the vertical direction from the upper end of the inclined roof portion opened by the first peeling step and the second peeling step to the lower end portion of the trunk portion. A longitudinal cutting step, a transverse cutting step of cutting the lower end portion of the body portion in the circumferential direction to cut off the bottom surface portion, and a pouring member removal for cutting off a predetermined region of the inclined roof portion and cutting off at least the pouring member And a process.

Further, the present invention is used in a paper container for storing a liquid content, and in a sheet-like coated paper in which a coating film having a gas barrier property is coated on one side of a paper base material layer, the coating amount of the coating film is 10 g / It is characterized by being m ² or more.

  According to the present invention, it is possible to easily open and disassemble a gobeltop type paper container provided with a pouring member. Therefore, the recyclability of the paper container can be improved.

The perspective view which looked at the paper container of a 1st embodiment of the present invention from the front side. The perspective view which looked at the paper container of 1st Embodiment of this invention from the back side Side surface sectional drawing of the upper end part of the paper container of 1st Embodiment of this invention. Top sectional drawing of the upper end part of the paper container of a 1st embodiment of the present invention. The expanded view which shows the blank board of the paper container of 1st Embodiment of this invention. The top view which expands and shows a part of scar group area | region of the paper container of 1st Embodiment of this invention. Sectional drawing which shows the layer structure of the blank board of the paper container of 1st Embodiment of this invention. The perspective view which shows the state after the 1st peeling process of the paper container of 1st Embodiment of this invention. The perspective view which shows the state after the 2nd peeling process of the paper container of 1st Embodiment of this invention. The top view which shows the state after the horizontal cutting process of the paper container of 1st Embodiment of this invention. The expanded view which shows the blank board of the paper container of 2nd Embodiment of this invention The top view which expands and shows a part of scar group area | region of the paper container of 2nd Embodiment of this invention. The top view which expands and shows a part of scar group area | region which concerns on the modification of the paper container of 2nd Embodiment of this invention. The top view which expands and shows a part of scar group area | region which concerns on the modification of the paper container of 2nd Embodiment of this invention. The top view which expands and shows a part of scar group area | region which concerns on the modification of the paper container of 2nd Embodiment of this invention. The top view which expands and shows a part of scar group area | region which concerns on the modification of the paper container of 2nd Embodiment of this invention. The expanded view which shows the blank board of the paper container of 3rd Embodiment of this invention. The perspective view which shows the state after the 1st peeling process of the paper container of 3rd Embodiment of this invention. The expanded view which shows the blank board of the paper container of 4th Embodiment of this invention. The expanded view which shows the blank board of the paper container of 5th Embodiment of this invention The expanded view which shows the blank board of the paper container of 6th Embodiment of this invention The expanded view which shows the blank board of the paper container of 7th Embodiment of this invention The expanded view which shows the blank board of the paper container of 8th Embodiment of this invention. Explanatory drawing which shows the disassembly procedure of the paper container of 8th Embodiment of this invention. Explanatory drawing which shows the disassembly procedure of the paper container of 8th Embodiment of this invention. The perspective view which looked at the paper container of 9th Embodiment of this invention from the front side The perspective view which looked at the paper container of 9th Embodiment of this invention from the back side The expanded view which shows the blank board of the paper container of 9th Embodiment of this invention Sectional drawing which shows the layer structure of the blank board of the paper container of 9th Embodiment of this invention Sectional drawing which shows the layer structure of the blank board of the paper container of the modification of 9th Embodiment of this invention The expanded view which shows the blank board of the paper container of 10th Embodiment of this invention. Sectional drawing which shows the layer structure of the blank board of the paper container of the other modification of this invention Sectional drawing which shows the layer structure of the blank board of the paper container of the other modification of this invention

<First Embodiment>
A first 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 configured in a gobeltop type, and alcoholic beverages (Japanese sake, wine, shochu, etc.), beverages (coffee, milk beverages, juice, tea, etc.), seasonings (dressing, etc.) or sanitary products (shampoo, rinse, etc.) Etc. are filled with liquid contents.

  The paper container 1 includes a main body 2 and a dispensing member 3. The main body 2 is formed by bending a blank plate 100 (see FIG. 5) having a paper base layer 62 (see FIG. 7) into a box shape. The pouring member 3 is made of a resin molded product, forms a pouring outlet for contents, and is opened and closed by a cap 3a.

  In the main body 2, the bottom surface of the cylindrical body portion 10 is closed by the bottom surface portion 20, and the top surface of the body portion 10 is closed by the inclined roof portion 30. The body 10 is formed in 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 order in the horizontal direction, and constitute a peripheral plate that forms the peripheral surface of the trunk portion 10.

  The inclined roof portion 30 is formed by connecting both side ends of a ceiling front plate 33 and a ceiling back plate 31 that 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 provided above the front plate 13 and is inclined rearward. The ceiling back plate 31 is provided above the back plate 11 and is inclined forward. The ceiling side plate 32 and the ceiling side plate 34 are respectively provided above the side plate 12 and the side plate 14, and are inclined between the ceiling front plate 33 and the ceiling back plate 31.

  The inclined roof portion 30 is closed by a top bonding portion H that is thermally bonded with a predetermined width from the upper end. Further, a scar group region E is formed at the upper end portions of the ceiling front plate 33, the ceiling rear plate 31, and the ceiling side plates 32, 34, and the upper end of the inclined roof portion 30 can be easily opened.

  3 and 4 show a side cross-sectional view and a top cross-sectional view of the upper end portion of the inclined roof portion 30. FIG. 3 shows a cross section passing through the ceiling side plate 32. The upper end portions of the ceiling side plate 32 and the ceiling side plate 34 are folded in two 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 top bonding portion H is composed of heat bonding portions 36 to 42. Further, the scar group region E is formed at the upper end portion of the thermal bonding portions 39 to 42 and the thermal bonding portion 38, and the formation region of the scar group region E has a lower opening strength than the non-formed region of the scar group region E. Can be made.

  The thermal bonding portion 36 (first bonding portion) is formed by thermally bonding the upper end portion of the folded ceiling side plate 32 with an outer surface adhesive layer 61 (see FIG. 7) described later. The thermal bonding portion 37 (first bonding portion) is formed by thermally bonding the upper end portion of the folded ceiling side plate 34 with the outer surface bonding layer 61 (see FIG. 7).

  The ceiling front plate 33 and the ceiling back plate 31 have protrusions 33b and 31b that protrude upward from the ceiling side plates 32 and 34. The thermal bonding portion 38 (second bonding portion) is formed by thermally bonding the protruding portions 33b and 31b with inner surface adhesive layers 74 (see FIG. 7) on the inner surfaces described later.

  The thermal bonding portion 39 (third bonding portion) is formed by thermally bonding the upper end portions of the ceiling side plate 32 and the ceiling front plate 33 with the inner surface adhesive layers 74 (see FIG. 7) on the respective inner surfaces. The thermal bonding portion 40 (third bonding portion) is formed by thermally bonding the upper end portions of the ceiling side plate 34 and the ceiling front plate 33 with the inner surface adhesive layers 74 (see FIG. 7) on the respective inner surfaces.

  The thermal bonding portion 41 (fourth bonding portion) is formed by thermally bonding the upper end portions of the ceiling side plate 32 and the ceiling back plate 31 with the inner surface adhesive layer 74 (see FIG. 7) on the respective inner surfaces. The thermal bonding portion 42 (fourth bonding portion) is formed by thermally bonding the upper end portions of the ceiling side plate 34 and the ceiling back plate 31 with the inner surface adhesive layers 74 (see FIG. 7) on the respective inner surfaces.

  FIG. 5 shows a development 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 unfolded is provided with a fold line 90 at a predetermined position, and the rectangular back plate 11, side plate 12, front plate 13, side plate 14, and adhesive margin piece 15 are in one direction. They are arranged in order.

  A ceiling back plate 31 is connected to the upper end of the back plate 11, and a bottom plate 21 is connected to the lower end. A ceiling side plate 32 is connected to the upper end of the side plate 12, and a bottom plate 22 is connected to the lower end. A ceiling front plate 33 is connected to the upper end of the front plate 13, and a bottom plate 23 is connected to the lower end. A ceiling side plate 34 is connected to the upper end of the side plate 14, and a bottom plate 24 is connected to the lower end. An adhesive margin piece 35 is continuously provided at the upper end of the adhesive margin piece 15, and an adhesive 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 extraction 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 are formed as convex surfaces having the center as the highest point. The protrusions 33 b and 31 b at the upper end portions of the ceiling front plate 33 and the ceiling rear plate 31 protrude upward from the uppermost points of the upper end surfaces 32 d and 34 d of the ceiling side plates 32 and 34.

  As will be described in detail later, the upper end portions of the ceiling side plate 32 and the ceiling side plate 34 are folded in two and the outer surfaces are thermally bonded. At this time, the release agent 69 is applied to a partial region (indicated by hatching in the drawing) on the outer surfaces of the upper end portions of the ceiling side plate 32 and the ceiling side plate 34.

  A cutting line 51 extending in the vertical direction along the adhesive margin pieces 35 and 15 is drawn on the ceiling side plate 34 and the side plate 14 at one end in the circumferential direction by a printing layer 68 (see FIG. 7). 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 a printing layer 68 (see FIG. 7) on the lower end portions 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 fold line 90 at the lower end of the back plate 11, the side plate 12, the front plate 13, and the side plate 14.

  The top adhesive portion H is horizontally disposed between the upper end surface 100a and the adhesive margin piece 35 of the inclined roof portion 30, the ceiling side plate 34, the ceiling front plate 33, the ceiling side plate 32, and the upper folding line 90 of the ceiling rear plate 31. It forms in the strip | belt shape extended in a direction, and the heat bonding parts 36-42 mentioned above are formed in the top part adhesion part H. As shown in FIG.

  A band-shaped scar group region E is formed in the top bond portion H, and the lower end of the scar group region E is located above the lower end of the top bond portion H. In addition, in FIG. 5, the scar group area | region E is formed also in the area | region in which the peeling agent 69 shown by hatching was formed.

  The lower end of the scar group E is positioned above the lower end of the top adhesive portion H, and is disposed below both side ends that are the lowest points of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34. Since the lower end of the scar group area E is located above the lower end of the top adhesive part H, the top adhesive part H facing the inside of the paper container 1 is a non-formation area of the scar group E and maintains the adhesive strength. Is done. Thereby, the fall of the sealing performance of the paper container 1 can be prevented.

  Further, when the lower end of the scar group area E is formed above the both side ends of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34, the ratio of the scar group area E in the thermal bonding portions 39 to 41 is low, Although the sealing property of the paper container 1 can be maintained, the unsealing strength is high and it is difficult to peel off the thermal bonding portions 39 to 41.

  For this reason, considering the sealing property of the paper container 1 and the easy opening of the upper end of the inclined roof portion 30, the lower end of the scar group region E is the lower end of the top adhesive portion H and the upper end surfaces 32d of the ceiling side plates 32, 34, More preferably, it is arranged at an intermediate position between both ends of 34d.

  The blank plate 100 is formed in a cylindrical shape by being bent at a fold line 90 and thermally bonded with the adhesive margin piece 15, the adhesive margin piece 25 and the adhesive margin piece 35. That is, the glue piece 15 connected to the side plate 14 at one end is thermally bonded to the back plate 11 at the other end, so that the cylindrical body portion 10 in the closed state in the circumferential direction is formed. The adhesive margin piece 25 connected to the bottom plate 24 at one end is thermally bonded to the bottom plate 21 at the other end, so that the bottom portion 20 is formed in a state where the bottom 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 bonded to the ceiling back plate 31 at the other end, so that the inclined roof portion 30 is formed in a state in which the upper end is opened and closed in the circumferential direction. The

  The bottom surface portion 20 is fixed in a state where the bottom surface plates 21 to 24 are folded at a fold line 90 and the bottom surface of the body portion 10 is closed by thermal bonding.

  The extraction member 3 inserted into the insertion hole 33a is thermally bonded to the periphery of the insertion hole 33a on the ceiling front plate 33 of the inclined roof portion 30. 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 fold line 90, and the above-described thermal bonding portions 36 to 42 are formed by thermal bonding. Thereby, the inclined roof portion 30 is fixed in a state where the top surface of the trunk portion 10 is closed.

  FIG. 6 is an enlarged plan view showing a part of the scar group region E, and FIG. 7 is a cross-sectional view showing the layer structure of the blank plate 100. The scar group region E is composed of a large number of scratches D carved on the blank plate 100 at a predetermined interval. The wound D is a fine piercing hole, and a scar group region E is formed in a strip shape.

  In the blank board 100, an outer surface adhesive layer 61, a paper base material layer 62, an intermediate layer 72, and an inner surface adhesive layer 74 are laminated in this order, and the intermediate layer 72 and the paper base material layer 62 are bonded via an interlayer adhesive layer 63. ing. Further, the intermediate layer 72 and the inner surface adhesive layer 74 are bonded via an interlayer adhesive layer 73. The intermediate layer 72 is formed by disposing a barrier layer 72b having gas barrier properties on one surface of the barrier base material layer 72a.

  The scratch D penetrates the intermediate layer 72 with the inner end surface of the inner surface adhesive layer 74 and the middle of the paper base material layer 62 in the thickness direction as both ends. As a result, the unsealing strength of the formation region of the scar group region E between the thermally bonded inner surface adhesive layers 74 is reduced as compared with the non-formation region of the scar group region E.

  If the scratch D penetrates the intermediate layer 72, the opening strength can be reduced in the scar group region E even if it does not reach the paper base layer 62.

As the paper base layer 62, a paper board having a basis weight of 250 to 450 g / m ² is used. An outer surface adhesive layer 61 is laminated on the outer surface of the paper base material layer 62. The outer surface adhesive layer 61 uses a heat-bondable resin such as thermoplastic low-density polyethylene or linear low-density polyethylene, and is laminated on the paper base layer 62 by an extrusion lamination method. On the outer surface of the outer surface adhesive layer 61, a print layer 68 is formed at a predetermined position by gravure printing or offset printing.

  The interlayer adhesive layer 63 is composed of low density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer, ionomer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid ester copolymer. A polyolefin-based resin such as coalescence or ethylene-methacrylate copolymer is used, and the paper base layer 62 and the intermediate layer 72 are laminated by an extrusion lamination method. The thickness of the interlayer adhesive layer 63 is usually 10 to 50 μm.

  The intermediate layer 72 includes a barrier base material layer 72a and a barrier layer 72b. The barrier base material layer 72a is a biaxially stretched polyester film or nylon film having excellent processability from the viewpoints of vapor deposition processability and lamination processability. Polypropylene film or the like is used. The thickness is usually 4 to 40 μm, preferably 9 to 25 μm.

  The barrier layer 72b is a vapor-deposited film of metal such as aluminum or an inorganic oxide vapor-deposited film such as aluminum oxide or silicon oxide formed on the upper surface of the barrier base material layer 72a, and has moisture resistance and gas barrier properties. This prevents and chemically protects the contents filled in the paper container 1 from oxidative deterioration and taste reduction. The barrier layer 72b is laminated on the paper base material layer 62 side with respect to the barrier base material layer 72a, but may be laminated on the inner surface adhesive layer 74 side.

  Alternatively, the intermediate layer 72 may be formed by laminating the barrier layer 72b with the barrier base material layer 72a by a dry lamination method or an extrusion lamination method using a metal foil such as aluminum. In this case, the metal foil is preferably laminated on the paper base material layer 62 side.

The interlayer adhesive layer 73 is for laminating the intermediate layer 72 and the inner surface adhesive layer 74 by an extrusion lamination method using the same resin as the interlayer adhesive layer 63, and the thickness is usually 10 to 50 μm. Further, the interlayer adhesive layer 73 is laminated by a dry lamination method using a two-component type adhesive for dry laminating composed of a main component and a curing agent such as polyester polyol-isocyanate, polyether polyol-isocyanate, and urethane-isocyanate. You can also In the case of the dry lamination method, the coating amount of the interlayer adhesive layer 73 is usually a solid content weight of 1 to 5 g / m ² .

  For the inner surface adhesive layer 74, a thermoadhesive resin having thermoplasticity is used, and a film using a resin such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene is used. In particular, it is preferable to use a film provided with easy tear using a cyclic polyolefin resin or the like. The thickness of the inner surface adhesive layer 74 is usually 20 to 100 μm, and is appropriately determined in consideration of conditions such as a lamination method and contents of the interlayer adhesive layer 73.

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

  Below, the formation method of the paper container 1 is demonstrated concretely. First, the paper base material layer 62 wound up in a roll shape is drawn out, and an anchor coating agent is printed on both surfaces of the paper base material layer 62. Next, the outer surface adhesive layer 61 is laminated on the outer surface of the paper base material layer 62 by EC (Extrusion Coating) method. Next, the paper base material layer 62 on which the outer surface adhesive layer 61 is laminated and the barrier layer 72b of the intermediate layer 72 are bonded together via the interlayer adhesive layer 63 by the EC method.

  Next, an anchor coating agent is printed on the inner surface of the barrier base material layer 72a of the intermediate layer 72, and the intermediate layer 72 and the inner surface adhesive layer 74 are bonded together via the interlayer adhesive layer 73 by the EC method. Next, a scratch processing is performed from the surface of the inner surface adhesive layer 74 by using a scratch group forming roll provided with a cutting blade of a predetermined scratch group, and a scratch D is formed by forming a scratch group region E at a predetermined position.

  Next, the outer surface of the outer surface adhesive layer 61 is subjected to corona treatment, and a printed layer 68 for drawing a pattern such as a product name is formed by gravure printing or offset printing. Thereby, the laminated body which comprises the blank board 100 is formed. In addition, the pattern which shows the dismantling method of the paper container 1 mentioned later is contained in the said pattern.

  Next, the blank plate 100 is punched by punching. At this time, the insertion hole 33a is formed, and the fold line 90 by the ruled line is formed. Next, the skiving hemming process of the paste margin pieces 15, 25, and 35 of the blank plate 100 is performed.

  Next, the blank plate 100 is formed into a cylindrical 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 adhesive margin pieces 15, 25, 35. . The cylindrical body whose upper and lower surfaces are opened is installed in a filling and sealing device equipped with a carton assembly device or the like. The bottom surface plates 21 to 24 are folded by the filling and sealing device to form the bottom surface portion 20, and the lower surface of the body portion 10 is closed. Next, the pouring member 3 is inserted into the insertion hole 33a and fixed to the inner surface of the blank plate 100 by thermal bonding. Next, the contents are filled into the body portion 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 region on the outer surface adhesive layer 61 at the upper end of the ceiling side plate 32 and the ceiling side plate 34. Heat bonding portions 36 and 37 are formed by thermally bonding the outer side adhesive layers 61 of the facing ceiling side plate 32 and the ceiling side plate 34 facing each other with a release agent 69 interposed therebetween. The release agent 69 is made of one or a plurality of resins selected from a silicone resin, a cellulose resin, a urethane resin, an acrylic resin, nitrified cotton, and the like, and lowers the adhesive strength of the outer surface adhesive layer 61 by thermal bonding.

  At this time, the upper end portions of the ceiling side plate 32 and the ceiling side plate 34 and the upper end portion of the ceiling front plate 33 are thermally bonded to each other to form the thermally bonded portions 39 and 40. Similarly, the inner surface adhesive layers 74 where the upper end portions of the ceiling side plate 32 and the ceiling side plate 34 and the upper end portion of the ceiling back plate 31 face each other are thermally bonded to form the thermally bonded portions 41 and 42. One end of the ceiling side plate 34 and the adhesive margin piece 35 are thermally bonded to the inner surface adhesive layers 74 facing each other. Further, the inner surface adhesive layers 74 where the protruding portion 33b and the protruding portion 31b face each other are thermally bonded to form the thermally bonded portion 38. Thereby, the inclined roof part 30 is formed, the top surface of the trunk | drum 10 is closed, and the paper container 1 shown in FIG. 1 is obtained.

  The paper container 1 is disassembled after all the contents are poured out. The dismantling operation of the paper container 1 is performed in the order of the first peeling step and the second peeling step.

  In the first peeling step, as shown by an arrow A <b> 1 in FIG. 1, a force is applied in a direction in which the ceiling front plate 33 and the ceiling back plate 31 are separated by fingers inserted above the ceiling side plate 34. Thereby, the left half of the thermal bonding portion 38 (see FIG. 3) between the ceiling front plate 33 and the ceiling rear plate 31 is peeled off, and the thermal bonding portion 37 (see FIG. 4) of the ceiling side plate 34 is peeled off. This operation is called a left peeling operation.

  Similarly, as shown by an arrow A2 in FIG. 2, a force is applied in a direction in which the ceiling front plate 33 and the ceiling back plate 31 are separated by a finger inserted above the ceiling side plate 32. As a result, the remaining right half of the thermal bonding portion 38 (see FIG. 3) between the ceiling front plate 33 and the ceiling rear plate 31 is peeled off, and the thermal bonding portion 36 (see FIG. 4) of the ceiling side plate 32 is peeled off. It is. This operation is called a right peeling operation. FIG. 8 shows a perspective view of the upper portion 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 (see FIG. 5) is disposed in a predetermined region in the heat bonding portion 36 and the heat bonding portion 37, the heat bonding portion 36 and the heat bonding portion 37 can be easily peeled off. In addition, a scar group region E is formed in the thermal bonding portion 38, and the thermal bonding portion 38 can be easily peeled off.

  Next, in the second peeling step, the facing ceiling front plate 33 and the ceiling side plate 34 are gripped with one hand, and the facing ceiling back plate 31 and the ceiling side plate 32 are gripped with the remaining one hand. Then, as shown by an arrow A3 in FIG. 8, both hands are pulled away. Thereby, a force is applied in a direction in which the ceiling back plate 31 and the ceiling side plate 34 are separated from each other, and the thermal bonding portion 42 (see FIG. 4) between the ceiling back plate 31 and the ceiling side plate 34 is peeled off. Further, a force is applied in a direction in which the ceiling front plate 33 and the ceiling side plate 32 are separated from each other, and the thermal bonding portion 39 (see FIG. 4) between the ceiling front plate 33 and the ceiling side plate 32 is peeled off. This operation is called a left front pull opening operation.

  At this time, the scar group region E is formed at the upper ends of the thermal bonding portion 42 and the thermal bonding portion 39, and the thermal bonding portion 42 and the thermal bonding portion 39 can be easily peeled off.

  Similarly, the facing ceiling front plate 33 and the ceiling side plate 32 are held with one hand, and the facing ceiling back plate 31 and the ceiling side plate 34 are held with one remaining hand. Then, as shown by an arrow A4 in FIG. 8, both hands are pulled away. Thereby, a force is applied in a direction in which the ceiling front plate 33 and the ceiling side plate 34 are separated from each other, and the thermal bonding portion 40 (see FIG. 4) between the ceiling front plate 33 and the ceiling side plate 34 is peeled off. Further, a force is applied in a direction in which the ceiling back plate 31 and the ceiling side plate 32 are separated from each other, and the thermal bonding portion 41 (see FIG. 4) between the ceiling back plate 31 and the ceiling side plate 32 is peeled off. This operation is called a right front pull opening operation.

  At this time, the scar group region E is formed at the upper ends of the thermal bonding part 40 and the thermal bonding part 41, and the thermal bonding part 40 and the thermal bonding part 41 can be easily peeled off.

  FIG. 9 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. 9, 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 the vertical direction is extended to the lower end portion of the trunk portion 10 along the cutting line 51. Disconnect. Next, in the transverse cutting step, the lower end portion of the body portion 10 is cut in the circumferential direction along the cutting line 52 by the cutting member S. Thereby, the bottom face part 20 is cut off from the body part 10, and the paper container 1 is cut open as shown in FIG. In the vertical cutting process and the horizontal cutting process, the blank plate 100 may be broken on the fold line 90 with fingers to open the paper container 1.

  Next, in the extraction member removing step, the boundary (folding line 90) between the left and right ends and the lower end of the ceiling front plate 33 is cut by the cutting member S. As a result, the ceiling front plate 33 and the extraction member 3 are separated from the trunk portion 10. The periphery of the extraction member 3 on the ceiling front plate 33 may be cut to separate the extraction member 3. Moreover, you may tear the blank board 100 on the folding line 90 with fingers, and cut | disconnect the ceiling front board 33. FIG.

  According to the present embodiment, the upper surface of the ceiling front plate 33 and the ceiling rear plate 31 is provided with the thermal bonding portion 38 (second bonding portion) in which the inner surface adhesive layer 74 is thermally bonded to each other. At the upper end portions of the ceiling side plates 32 and 34 and the ceiling front plate 33, thermal bonding portions 39 and 40 (third bonding portions) in which the inner surface adhesive layer 74 is thermally bonded to each other are provided. At the upper end portions of the ceiling side plates 32 and 34 and the ceiling back plate 31, thermal bonding portions 41 and 42 (fourth bonding portions) are provided, which are heat bonded to the inner surface adhesive layer 74.

  When the thermal bonding portion 38 is peeled off and the paper container 1 is disassembled, the scar bonding area 38 is formed in the thermal bonding portion 38, and the thermal bonding portion 38 can be easily peeled off.

  In addition, a scar group region E is formed at the upper end portions of the thermal bonding portion 42 and the thermal bonding portion 39 and the upper end portions of the thermal bonding portion 40 and the thermal bonding portion 41, and the thermal bonding portions 39 to 42 can be easily peeled off. Thus, the upper surface of the inclined roof portion 30 can be easily opened.

  Further, a release agent 69 for reducing 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 bonding portions 36 and 37, so that the heat bonding portions 36 and 37 can be easily peeled off. .

  In the above-described embodiment, the scar group region E is provided in the thermal bonding portions 38 to 42, but the scar group region E may be provided only in the thermal bonding portion 38. Thereby, a 1st peeling process can be performed easily.

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

  In Tables 1 and 2, the test piece 1 was formed by the paper container 1 of the first embodiment, and the width of the front plate 33 and the back plate 31 was 85 mm. Further, the test piece 1 is provided with a scar group region E having a width of 5 mm from the upper end surface 100a of the blank plate 100, and a top adhesive portion H having a width of 1 cm is formed from the upper end surface 100a of the blank plate 100 to block the upper end of the inclined roof portion. did. The test piece of the comparative example omits the scar group region E from the present embodiment. Moreover, the test piece of this embodiment and the comparative example was assembled with the same apparatus.

  Further, the tensile speed of the tensile test is 300 mm / min. In the sensory test, “◯” indicates a case where it is easy to open, “×” indicates a case where it is difficult to open, and “Δ” indicates a case where neither is easy to open.

  According to Table 1, by providing the scar group region E, the thermal bonding portions 39 to 42 can be peeled off with a small tensile force at the time of the first and second peeling steps as compared with the case where the scar group region E is not provided. .

  According to Table 2, it can be made easy to open in the 1st exfoliation process and the 2nd exfoliation process by providing flaw mark group field E in thermal adhesion parts 38-42.

Second Embodiment
FIG. 11 is a development view of the blank plate 100 of the paper container 1 of the second embodiment, and FIG. 12 is an enlarged plan view showing a part of the scar group region E. This embodiment differs from the first embodiment in the range of the scar group region E and the shape of the scratch D. The ceiling front plate 33 and the ceiling back plate 31 are provided with a pair of front inclined fold lines 93 and a pair of rear inclined fold lines 91. Other parts are the same as those in the first embodiment.

  The ceiling front plate 33 is provided with a pair of front inclined fold lines 93, and the ceiling rear plate 31 is provided with a pair of rear inclined fold lines 91. The pair of front inclined fold lines 93 extend so as to be closer to each other as they go upward from both side ends of the lower portion of the ceiling front plate 33. The pair of back inclined folding lines 91 extend so as to be closer to each other as they go upward from both side ends of the lower part of the ceiling back plate 31.

  A band-shaped scar group region E is formed in the top adhesive portion H of the blank plate 100, and an unscratched scar group region E0 in which the scar group region E is not formed by a predetermined width from the side edge of the adhesive margin piece 35 is provided.

  The blank plate 100 is subjected to an end surface treatment by a skive hemming process so that the end portions of the adhesive margin pieces 15, 25, and 35 are bent so that the end surfaces do not contact the contents. At this time, if a scratch D is engraved on the side edge of the adhesive margin piece 35, paper dust is generated during skive hemming. For this reason, by providing the undamaged scar group region E0, the generation of paper dust can be prevented, and the paper dust can be prevented from being mixed inside the paper container 1.

  The scratch D in the scar group region E is formed by arranging a plurality of cuts D1 extending in the horizontal direction X in the horizontal direction X and the vertical direction Y at predetermined intervals. For example, the cut D1 is formed such that the length A1 in the horizontal direction X is 1.5 mm, the period B1 in the horizontal direction X is 2.7 mm, and the period C1 in the vertical direction Y is 1.0 mm. In addition, the notch D1 adjacent to the vertical direction Y is arranged so as to be shifted by about (B1) / 2 in the horizontal direction.

  FIGS. 13 to 16 are enlarged plan views showing a part of the scar group region E according to the modification of the present embodiment. As shown in FIG. 13, the scratch D in the scar group region E may be formed by arranging a plurality of cuts D <b> 2 extending in the vertical direction Y at a predetermined interval in the horizontal direction X and the vertical direction Y.

  For example, the cut D2 is formed such that the length A2 in the vertical direction X is 1.3 mm, the period B2 in the horizontal direction X is 1.0 mm, and the period C2 in the vertical direction Y is 2.3 mm. Further, the notch D2 adjacent in the horizontal direction X is arranged so as to be shifted by about (C2) / 2 in the vertical direction.

  Further, as shown in FIG. 14, the scratch D in the scar group region E is constituted by a cut (first cut portion) D1 extending in the horizontal direction X and a cut (second cut portion) D2 extending in the vertical direction Y. D1 and the cuts D2 may be arranged alternately.

  The cut D1 is formed with a length A1 in the horizontal direction X of 3.0 mm, for example, and the cut D2 is formed with a length A2 in the vertical direction Y of 3.0 mm, for example. The period B1 in the horizontal direction X of the cuts D1 and D2 is 4.0 mm, B2 is 4.0 mm, the period C1 in the vertical direction Y is 4.0 mm, and C2 is 4.0 mm. Further, a cut D1 is arranged in the middle of the cut D2 adjacent in the horizontal direction X, and a cut D2 is arranged in the middle of the cut D1 adjacent in the vertical direction Y.

  As shown in FIG. 15, the scratch D in the scar group region E may be formed by arranging a plurality of cuts D <b> 3 that are inclined with respect to the horizontal direction X in the horizontal direction X and the vertical direction Y at predetermined intervals. The cut D3 is formed, for example, with an inclination angle θ3 of 45 °, a length A3 of 1.5 mm, a horizontal direction X period B3 of 1.41 mm, and a vertical direction period C3 of 1.91 mm.

  In addition, as shown in FIG. 16, the wound D in the scar group region E may be provided with a cut D <b> 3 that is inclined with respect to the horizontal direction X as in FIG. At this time, the notch D3 adjacent to the up-down direction Y is inclined in the reverse direction with respect to the up-down direction and arranged in a letter C shape. The cut D3 is formed, for example, with an inclination angle θ3 of 45 °, a length A3 of 3.0 mm, a horizontal direction X period B3 of 1.41 mm, and a vertical direction period C3 of 2.97 mm.

  The lengths A1 to A3 of the cuts D1 to D3 are preferably 1.3 mm to 4.0 mm, and B1 to B3 are preferably 1.4 mm to 6.0 mm. C1 to C3 are preferably 1.0 mm or greater and 4.0 mm or less. The inclination angle θ3 is preferably 15 ° or more and 75 ° or less. By forming the cuts D1 to D3 within these ranges, the thermal bonding portions 38 to 42 can be easily peeled off when the paper container 1 is disassembled.

  The ceiling front plate 33 and the ceiling back plate 31 are provided with a pair of front inclined fold lines 93 and a pair of rear inclined fold lines 91. Thereby, when a force is applied in a direction in which the ceiling front plate 33 and the ceiling back plate 31 are separated in the first peeling step, the ceiling front plate 33 and the ceiling back plate 31 are respectively connected to the front inclined fold line 93 and the rear inclined fold line 91. Is easily folded along.

  According to the present embodiment, when the paper container 1 is disassembled by arranging a plurality of incisions D1 to D4 extending in a predetermined direction in the horizontal direction X and the vertical direction Y to form the scratches D, the thermal bonding portions 38 to 42 can be easily peeled off.

  At this time, the cut D1 extends in the horizontal direction X, and the cut D2 extends in the vertical direction Y. Further, the first notch D1 and the second notch D2 may be alternately arranged in parallel.

  Further, when the cut D3 is inclined with respect to the horizontal direction X, the thermal bonding portions 38 to 42 can be more easily peeled off.

  Table 3 shows the results of examining the tensile force required during the second peeling step of the paper container 1 of the second embodiment by a tensile test. Table 4 shows the results of a sensory test conducted by ten testers on the ease of opening the paper container 1 of the second embodiment during the first peeling step and the second peeling step.

  In Table 3 and Table 4, the test piece 1-the test piece 7 were formed with the paper container 1 of 2nd Embodiment, and the width | variety of the front board 33 and the back board 31 was 85 mm. Further, the test pieces 1 to 7 are provided with a scar group region E having a width of 7 mm from the upper end surface 100a of the blank plate 100, and forming a top adhesive portion H having a width of 15 mm from the upper end surface 100a of the blank plate 100 to form an inclined roof portion. The top of the was closed.

  The test piece 1 and the test piece 2 formed a cut D1 shown in FIG. At this time, the test piece 1 was set to A1 = 1.5 mm, B1 = 2.7 mm, and C1 = 1.0 mm. Moreover, the test piece 2 was made into A1 = 3.0mm, B1 = 4.2mm, and C1 = 2.0mm.

  The test piece 3 and the test piece 4 formed the cut D2 shown in FIG. At this time, the test piece 3 was set to A2 = 1.3 mm, B2 = 1.0 mm, and C2 = 2.3 mm. Moreover, the test piece 4 was set to A2 = 2.4 mm, B2 = 2.0 mm, and C2 = 3.6 mm.

  The test piece 5 formed incisions D1 and D2 shown in FIG. At this time, the test piece 5 was set to A1 = 3.0 mm, B1 = 4.0 mm, C1 = 4.0 mm, A2 = 3.0 mm, B2 = 4.0 mm, and C2 = 4.0 mm.

  In the test piece 6 and the test piece 7, a cut D3 shown in FIG. At this time, the test piece 6 was set to A3 = 1.5 mm, B3 = 1.41 mm, C3 = 1.91 mm, and θ3 = 45 °. The test piece 7 had A3 = 3.0 mm, B3 = 1.41 mm, C3 = 2.97 mm, and θ3 = 45 °.

  The test piece 8 formed a cut D3 shown in FIG. At this time, the test piece 8 was set to A3 = 3.0 mm, B3 = 1.41 mm, and C3 = 2.97 mm.

  On the other hand, the test piece of the comparative example omits the scar group region E from the present embodiment. Moreover, the test piece of this embodiment and the comparative example was assembled with the same apparatus.

  Further, the tensile speed of the tensile test is 300 mm / min. In the sensory test, “◎” indicates that 8 or more of 10 testers are determined to be easy to open, and “◯” indicates that 5 or more and 7 or less are easy to open. Further, the case where one of the ten testers is not judged to be easy to open is indicated by “x”.

  According to Table 3, by providing the scar group region E, the thermal bonding portions 39 to 42 can be peeled off with a small tensile force at the time of the first and second peeling steps as compared with the case where the scar group region E is not provided. .

  According to Table 4, it can be made easy to open in the 1st exfoliation process and the 2nd exfoliation process by providing flaw mark group field E in thermal adhesion parts 38-42. In particular, when the cuts D1 and the cuts D2 are alternately arranged in parallel and when the cuts D3 are inclined with respect to the horizontal direction X, the thermal bonding portions 38 to 42 can be more easily peeled off.

<Third Embodiment>
FIG. 17 shows a developed view of the blank plate 100 of the paper container 1 of the third embodiment, and FIG. 18 shows a perspective view of the upper part of the paper container 1 after the first peeling step. In the present embodiment, a notch (first notch) 31e is provided at the center of the upper end surface 31d of the ceiling back plate 31 as compared to the second embodiment. Further, the front inclined plate 93 and the rear inclined fold line 91 are not provided on the ceiling front plate 33 and the ceiling rear plate 31. Other parts are the same as those of the second embodiment.

  The lower end of the notch 31e is located above the uppermost point of the center part of the ceiling side plate 32 and the ceiling side plate 34 when the inclined roof portion 30 is formed (see FIG. 18). Thereby, the leakage of the contents can be prevented.

  In addition, by providing the notch 31e, when a force is applied in a direction in which the ceiling front plate 33 and the ceiling back plate 31 are separated in the first peeling step, the ceiling back along the folding line extending from the notch 31e is used. The face plate 31 can be easily folded back.

  Thereby, in the first peeling step, the intersection seal portion 38b where the center portion of the ceiling front plate 33, the center portion of the ceiling back plate 31 and the center portion of the ceiling side plate 32 and the ceiling side plate 34 overlap is peeled off, and the bonded portion The bonding area of the central portion 38a of 38 is reduced. Therefore, in the second peeling step, the heat bonding portions 39 to 42 can be easily peeled off.

<Fourth embodiment>
FIG. 19 shows a development view of the blank plate 100 of the paper container 1 of the fourth embodiment. The present embodiment is different from the third embodiment in that a notch (second notch) 33e is provided at the center of the upper end surface 33d of the ceiling front plate 33. Other parts are the same as those of the third embodiment.

  The lower end of the notch 33e is located above the lower end of the scar group region E. Thereby, the effect similar to 3rd Embodiment can be acquired. Further, by providing the notch 33e, the front of the ceiling along the fold line extending from the notch 33e when a force is applied in a direction separating the ceiling front plate 33 and the ceiling rear plate 31 in the first peeling step. The face plate 33 can be easily folded back.

  Thereby, the ceiling front plate 33 and the ceiling back plate 31 are folded back along the fold lines extending from the notches 31e and 33e, respectively, whereby the intersection seal portion 38b is further peeled off in the first peeling step. Therefore, the bonding area of the central portion 38a of the bonding portion 38 becomes smaller. Thereby, in a 2nd peeling process, the heat bonding parts 39-42 can be peeled off more easily.

  Moreover, it is the same shape as the notch 33e and the notch 31e, and when the inclined roof part 30 is formed, it arrange | positions facing. Thereby, it is possible to prevent the back surface of the ceiling front plate 33 or the front surface of the ceiling back plate 31 from being exposed through the notch 31e or the notch 31e. Accordingly, it is possible to prevent a decrease in the aesthetic appearance of the paper container 1.

<Fifth Embodiment>
FIG. 20 shows a development view of the blank plate 100 of the paper container 1 of the fifth embodiment. Compared with the fourth embodiment, this embodiment is provided with notches (third notches) 32e and 34e at the center of the upper end surfaces 32d and 34d of the ceiling side plate 32 and the ceiling side plate 34, respectively. Other parts are the same as in the fourth embodiment.

  The lower ends of the notches 32e and 34e are located above the lower end of the scar group region E. The lower ends of the notches 31e and 33e are located above the lower ends of the notches 32e and 34e when the inclined roof portion 30 is formed. Thereby, the leakage of the contents can be prevented.

  Further, by providing the notches 32e and 34e, the bonding area of the bonding portions 39 to 42 is reduced. Therefore, in the second peeling step, the thermal bonding portions 39 to 42 can be peeled off more easily.

<Sixth Embodiment>
FIG. 21 shows a development view of the blank plate 100 of the paper container 1 of the sixth embodiment. The present embodiment is different from the first embodiment in that opening start portions 31c and 33c and chamfers 31f and 33f are provided on the ceiling back plate 31 and the ceiling front plate 33. Moreover, the front inclined plate 93 and the back inclined fold line 91 are provided on the ceiling front plate 33 and the ceiling rear plate 31 as in the second embodiment. Other parts are the same as those in the first embodiment.

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

  One or more unsealing start portions 31c and 33c are formed in a range within 3 mm upward from the intersection P between the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 and the projecting portions 31b and 33b. It is more desirable to provide the opening start portions 31c and 33c on the intersection P. Moreover, the horizontal length of the opening start parts 31c and 33c is formed to be 5 mm or less. Thereby, the fall of the beauty | look of the paper container 1 can be prevented.

  Chamfers 31f and 33f are provided at the upper end portions on both sides 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 35 f is provided at the upper end portion of one side end of the adhesive margin piece 35. Due to the chamfers 31f, 33f, and 35f, the bonding area of the thermal bonding portion 38 of the protruding portions 31b and 33b is reduced, and both end portions of the thermal bonding portion 38 can be easily peeled off. The chamfers 31f, 33f, and 35f may be formed in a straight line shape or a curved shape.

  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 between the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 and the protruding portions 31b and 33b. Thereby, the adhesion area of the both-ends part of the heat bonding part 38 can be made small reliably. It is more desirable to provide the lower ends of the chamfers 31f, 33f, and 35f on the intersection point P.

  The horizontal length L1 of the chamfers 31f, 33f, and 35f is 3 mm or more and is less than or equal to ½ of the lateral width of the ceiling back plate 31 and the ceiling front plate 33. Thereby, the adhesion area of the both-ends part of the heat bonding part 38 can be made small reliably. It is more desirable that the length L1 is 5 mm to 20 mm.

  In the first peeling step of disassembling the paper container 1 having the above configuration, the side end of the thermal bonding portion 38 has a small gap between the ceiling side plates 32, 34 and the opening start portions 31c, 33c, so that the opening start portion 31c, It can be easily peeled up to 33c. And the protrusion part 31b and the protrusion part 33b leave | separate, cutting the protrusion part 31b and the inner surface adhesive layer 74 of the protrusion part 33b and the barrier base material layer 72a from the opening start parts 31c and 33c.

  At this time, since the chamfers 31f, 33f, and 35f are provided, the bonding area at both side ends of the thermal bonding portion 38 is small, and the protruding portion 31b and the protruding portion 33b can be easily separated. Thereby, a part of one paper base material layer 62 of the protrusion part 31b and the protrusion part 33b is separated in the laminating direction and peeled off integrally with the other. For this reason, the heat bonding part 38 can be peeled off easily.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. In addition, since the opening start portions 31c and 33c formed by cutting or notching the blank plate 100 are provided at both end portions of the projecting portions 31b and 33b, the thermal bonding portion 38 (second bonding portion) is more formed in the first peeling step. It can be easily peeled off.

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

  The opening start portions 31c and 33c can be easily formed by a cut (I notch) or a notch (V notch) obtained by cutting the blank plate 100. At this time, the opening start portions 31c and 33c only need to penetrate at least the inner surface adhesive layer 74 and the barrier base material layer 72a. Thereby, the thermal bonding part 38 can be peeled off more easily by tearing the interior part 70 and separating the paper base material layer 62 in the stacking direction.

  Moreover, you may omit either the opening start part 31c or the opening start part 33c. 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. In other words, the opening start portion may be provided at one end of one or both of the pair of protruding portions 31b and the protruding portion 33b and may be provided at the other end of one or both of the protruding portions 31b and the protruding portion 33b.

  In addition, since the chamfers 31f and 33f are provided at both side ends of the protruding portions 31b and 33b, the bonding area of both side ends of the thermal bonding portion 38 is reduced, and both side ends of the thermal bonding portion 38 are more easily peeled off. be able to.

  In addition, since the lower ends of the chamfers 31f and 33f are formed in a range of 2 mm or less upward from the intersection point P, the bonding area at both end portions of the thermal bonding portion 38 can be reliably reduced. Further, since the horizontal length L1 of the chamfers 31f, 33f, and 35f is 3 mm or more and less than ½ of the horizontal width of the ceiling back plate 31 and the ceiling front plate 33, the bonding of both side ends of the thermal bonding portion 38 is performed. The area can be reliably reduced.

  Note that either the chamfer 31f or the chamfer 33f may be omitted. Further, the chamfer 31f at one end of the protruding portion 31b may be omitted, and the chamfer 33f at the other end of the protruding portion 33b may be omitted. In other words, the chamfer may be provided at one end of one or both of the pair of protrusions 31b and 33b and provided at the other end of one or both of the protrusions 31b and 33b. However, as shown in the present embodiment, it is more preferable 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, the chamfered portions face each other to prevent the paper container 1 from deteriorating in appearance.

  In this embodiment, the opening start parts 31c and 33c may be omitted. In the present embodiment, the chamfers 31f, 33f, and 35f may be omitted.

<Seventh embodiment>
Next, FIG. 22 has shown the expanded view of the blank board 100 of the paper container 1 of 7th Embodiment. The present embodiment differs from the first embodiment in the shapes of the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34. Moreover, the opening start parts 31c and 33c similar to 2nd 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 the both side ends as the highest 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 the both side ends as the highest points.

  The lower end of the scar group region E is located on the lower ends of the inclined portions 32e and 34e. Further, the distance F from the lower end of the inclined portions 32e, 34e to the fold line 90 at the lower end of the thermal bonding portions 36, 37 is formed to be 5 mm or more. Thereby, the leakage of the contents can be prevented.

  The protrusions 33 b and 31 b at the upper end portions of the ceiling front plate 33 and the ceiling rear plate 31 protrude upward from the uppermost points of the upper end surfaces 32 d and 34 d 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 apparatus as that of the first embodiment is used when assembling the paper container 1, the heat bonding portion 38 is thermally bonded by pressurizing the same area as that of the first embodiment. For this reason, non-adhesive portions 33d and 31d in which the ceiling front plate 33 and the ceiling rear plate 31 are not bonded are formed between the thermal bonding portion 38 and the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34. As a result, the bonding area of the bonding portions 39 to 42 is reduced. In addition, the bonding area of the thermal bonding portions 36 and 37 of the ceiling side plates 32 and 34 is reduced.

  Moreover, the opening start parts 31c and 33c provided on both side ends of the protruding part 31b and the protruding part 33b are arranged on the non-adhesive parts 31d and 33d.

  In the first peeling step of disassembling the paper container 1 having the above-described configuration, the upper bonding surfaces 32d and 34d of the ceiling side plates 32 and 34 are concave, so that the bonding area of the thermal bonding portions 36 and 37 is small. For this reason, the heat bonding parts 36 and 37 can be easily peeled off.

  Further, the protruding portion 33b and the protruding portion 31b are separated from the opening start portions 31c and 33c while the protruding portion 33b and the inner surface adhesive layer 74 of the protruding portion 31b and the barrier base material layer 72a are torn. For this reason, the heat bonding part 38 can be peeled off easily.

  Further, in the second peeling step, the thermal bonding portions 39 to 42 are peeled more easily because the opening strength of the thermal bonding portions 39 to 42 is reduced by the scar group region E and the bonding area of the thermal bonding portions of the thermal bonding portions 39 to 42 is narrow. be able to.

<Eighth Embodiment>
Next, FIG. 23 has shown the expanded view of the blank board 100 of the paper container 1 of 8th Embodiment. 24 and 25 are explanatory diagrams showing a procedure for disassembling the paper container 1. This embodiment has a folding process before a 1st peeling process with respect to 2nd Embodiment. Moreover, the top fold line 30 a is provided on the ceiling side plates 32, 34, and the trunk fold line 10 a is provided on the side plates 12, 14. Other parts are the same as those of the second embodiment.

  As shown in FIG. 23, body fold lines 10a extending in the vertical direction and inclined at the lower end are formed in the horizontal center of the side plates 12 and 14, respectively. In addition, a top fold line 30a extending in the vertical direction is formed at the center of the ceiling side plates 32 and 34 in the horizontal direction. By forming the trunk fold line 10a and the top fold line 30a, the folding operation of the empty paper container 1 after use becomes easy.

  The top fold line 30a and the trunk fold line 10a are slightly spaced from the fold line 90 at the boundary between the side plate 12 and the ceiling side plate 32 and the fold line 90 at the boundary between the side plate 14 and the ceiling side plate 34. It is preferable to form in a state where the gap is opened. By providing the interval, the deformation of the paper container 1 can be prevented.

  For the same reason, the oblique line below the body fold line 10 a is also slightly spaced from the fold line 90 at the boundary between the side plate 12 and the bottom plate 22 and the fold line 90 at the boundary between the side plate 14 and the bottom plate 24. It is preferable to form in the state.

  In this embodiment, it has a folding process before a 1st peeling process. As shown in FIG. 24, in the folding step, first, the cap 3a is removed, and the central portion of the boundary (folding line 90) between the ceiling side plates 32 and 34 and the top side plates 12 and 14 with the top 20 closed. The top fold line 30a and the body fold line 10a are folded inwardly with the thumb. Thereby, the ceiling side plates 32 and 34 and the upper portions of the side plates 12 and 14 are folded in two by valley folding, and the paper container 1 is folded in a state as shown in FIG.

  In addition, when folding the ceiling side plates 32 and 34 and the side plates 12 and 14 in half, it is easily folded by pressing the thumb along the top fold line 30 and the trunk fold line 10a and pushing inward. Can do. Alternatively, the top fold line 30a and the body fold line 10a may not be provided, and the ceiling side plates 32 and 34 and the side plates 12 and 14 may be pressed and folded in half.

  Next, in the first peeling step, a force is applied in a direction away from the ceiling front plate 33 and the ceiling back plate 31 of the folded paper container 1. Thereby, the heat bonding parts 36 and 37 and the heat bonding part 38 can be peeled off more easily.

<Ninth Embodiment>
26 and 27 are a perspective view as seen from the front side and a perspective view as seen from the back side of the paper container 1 of the ninth embodiment, respectively. FIG. 28 shows a development view of the blank plate 100 of the paper container 1 of the present embodiment. In this embodiment, the scar group region E is omitted from the first embodiment, and a body fold line 10a and a top fold line 30a similar to those in the eighth embodiment are provided. Further, similarly to the second embodiment, a front inclined fold line 93 and a rear inclined fold line 91 are provided. Further, the layer configuration of the blank plate 100 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

  The top fold line 30a extends in the vertical direction through the horizontal center portion of the ceiling side plates 32, 34. The trunk fold line 10a extends in the vertical direction through the horizontal center portion of the side plates 12 and 14. The lower end portion of the body part folding line 10a branches forward and backward and inclines toward the front end portion and the rear end portion of the bottom surface portion 20, respectively. A side fold line 80 is formed by the top fold line 30a and the body fold line 10a.

  The lower end of the top fold line 30a and the upper end of the body fold line 10a are separated from the fold line 90 at the boundary between the ceiling side plates 32 and 34 and the side plates 12 and 14 by a predetermined distance (for example, about 5 mm). That is, the side fold line 80 is divided at the boundary between the ceiling side plates 32 and 34 and the side plates 12 and 14. Thereby, deformation | transformation of the shape loss etc. of the paper container 1 can be prevented. Note that the folding process of folding the side plates 12 and 14 and the ceiling side plates 32 and 34 in two along the side fold line 80 and folding the empty paper container 1 after use is the same as in the eighth embodiment.

  FIG. 29 is a cross-sectional view showing the layer structure of the blank plate 100 of the paper container 1 of the present embodiment. In the blank plate 100 of the present embodiment, the interlayer adhesive layer 63 and the barrier base material layer 72a are omitted from the blank plate 100 of the first embodiment (see FIG. 7). The barrier layer 72b is made of a coating film coated on the inner surface of the paper base material layer 62. By coating the inner surface of the paper base layer 62 with a coating film having gas barrier properties, a sheet-like coated paper 67 is formed.

The material of the barrier layer 72b is not particularly limited. For example, any of PVA (polyvinyl alcohol), zinc acrylate, alumina phosphate, and TEOS (Tetraethyl orthosilicate) can be used. . The coating amount of the barrier layer 72b is preferably 10 g / m ² or more. Thereby, the barrier layer 72b can be stably formed on the paper base material layer 62.

  Below, the formation method of the laminated body which comprises the blank board 100 of this embodiment is demonstrated. First, the paper base layer 62 wound up in a roll shape is drawn out, and a coating liquid that is a material of the barrier layer 72b is applied onto the lower surface (inner surface) of the paper base layer 62. Thereafter, the coating liquid is dried to form a barrier layer 72b made of a coating film on the lower surface of the paper base layer 62. Next, an anchor coating agent is printed on the upper surface (outer surface) of the paper base material layer 62.

  Next, the outer surface adhesive layer 61 is laminated on the upper surface (outer surface) of the paper base material layer 62 by an EC (Extrusion Coating) method. Next, an anchor coating agent is printed on the lower surface (inner surface) of the barrier layer 72b, and the barrier layer 72b and the inner surface adhesive layer 74 are bonded together via the interlayer adhesive layer 73 by the EC method. Next, a corona treatment is applied to the outer surface of the outer surface adhesive layer 61, and a printing layer 68 is formed by gravure printing or offset printing. Thereby, the laminated body which comprises the blank board 100 is formed.

  When the empty paper container 1 after use is disassembled, the first peeling step and the second peeling step are sequentially performed after the folding step, as in the eighth embodiment. At this time, since the barrier base material layer 72a made of a resin film is not formed on the blank plate 100, the thermal bonding portions 38 to 42 can be easily peeled off without forming the scar group region E. In addition, you may perform a 1st peeling process and a 2nd peeling process, without performing a folding process.

  Further, since the pair of front inclined fold lines 93 and the pair of rear inclined fold lines 91 are provided, the ceiling front plate 33 and the ceiling back are respectively provided along the front inclined fold lines 93 and the rear inclined fold lines 91 in the first peeling step. The face plate 31 is easily folded in two. Thereby, the heat bonding parts 36-38 can be peeled off more easily at the time of a 1st peeling process.

  In addition, when low density polyethylene (LDPE) is used as the outer surface adhesive layer 61 (see FIG. 29) and low density polyethylene is used as the inner surface adhesive layer 74, the thermal bonding portions 36 to 42 at the time of the first peeling step and the second peeling step. Is more desirable because it can be peeled off more easily.

  According to this embodiment, the barrier layer 72b is made of a coating film having gas barrier properties. Thereby, the barrier base material layer 72a can be omitted from the blank plate 100. Therefore, the manufacturing man-hour of the blank board 100 can be reduced. Further, a metal foil such as an aluminum foil can be omitted from the blank plate 100. Thereby, when inspecting the paper container 1 in which the contents are stored, it becomes easy to detect the metal piece mixed in the paper container 1 with the metal detector.

  Moreover, in the blank board 100, since the barrier base material layer 72a which consists of a resin film can be omitted, even if it does not form the scar group area | region E, the heat bonding parts 38-42 are easy at the time of a 1st peeling process and a 2nd peeling process. Can be peeled off. Therefore, the manufacturing man-hour of the paper container 1 can be reduced.

  FIG. 30 is a cross-sectional view showing the layer structure of the blank plate 100 of the paper container 1 according to a modification of the present embodiment. In this modification, the interlayer adhesive layer 73 may be omitted from the blank plate 100 shown in FIG. In this case, the inner surface adhesive layer 74 is laminated on the lower surface (inner surface) of the barrier layer 72b by the EC method. At this time, if low density polyethylene is used as the outer surface adhesive layer 61 and low density polyethylene is used as the inner surface adhesive layer 74, the thermal bonding portions 36 to 42 are more easily peeled off during the first peeling step and the second peeling step. It is more desirable because it can.

<Tenth Embodiment>
Next, FIG. 31 has shown the expanded view of the blank board 100 of the paper container 1 of 10th Embodiment. Compared with the ninth embodiment, this embodiment is provided with notches (third notches) 32e, 34e similar to the fifth embodiment on the ceiling side plates 32, 34, respectively. Other parts are the same as those of the ninth embodiment.

  By providing the notches 32e and 34e, the bonding area of the bonding portions 39 to 42 is reduced. Therefore, in the second peeling step, the heat bonding portions 39 to 42 can be peeled off more easily.

  The present invention is not limited to the above-described embodiments, and various modifications are possible. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the present invention. Included in the technical scope. For example, the cuts D1 to D3 of the scar group region E shown in the second embodiment may be formed in the scar group region E shown in the sixth and seventh embodiments. Further, in the seventh embodiment, instead of forming the opening start portions 31c, 33c by cutting the blank plate 100 in the horizontal direction, the cuts D1 to D3 are arranged side by side more closely than other regions, and the opening start portion 31c, 33c may be formed.

  Moreover, you may make the layer structure of the blank board 100 of the paper container 1 of 1st Embodiment-8th Embodiment the same as the layer structure of the blank board 100 of the paper container 1 of 9th Embodiment. Thereby, the heat bonding parts 38-42 can be peeled off more easily at the time of a 1st peeling process and a 2nd peeling process. In this case, as shown in FIGS. 32 and 33, the scratch D may be formed by penetrating the barrier layer 72 b with both the inner end surface of the inner surface adhesive layer 74 and the middle in the thickness direction of the paper base material layer 62 as both ends. Further, the side fold lines 80 may be provided on the ceiling side plates 32 and 34 and the side plates 12 and 14 of the paper container 1 according to the second to seventh embodiments. Further, a pair of front inclined fold lines 93 and a pair of rear inclined fold lines 91 are provided on the ceiling front plate 33 and the ceiling rear plate 31 of the paper container 1 of the third to fifth embodiments and the seventh embodiment, respectively. Also good.

  The layer configuration of the blank plate 100 of the paper container 1 of the second embodiment to the seventh embodiment is the same as the layer configuration of the blank plate 100 of the paper container 1 of the ninth embodiment, and the second embodiment to the seventh embodiment. The scar group region E may be omitted from the blank plate 100 of the paper container 1 in the form.

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

DESCRIPTION OF SYMBOLS 1 Paper container 2 Main-body part 3 Outgoing member 10 trunk | drum 10a trunk | drum fold line 11 back board 12,14 side board 13 front board 15,25,35 adhesive margin piece 20 bottom part 21-24 bottom board 30 inclined roof part 30a Top folding line 31 Ceiling back plate 31b, 33b Protruding portion 31c, 33c Opening start portion 31d, 33d Non-adhesive portion 32, 34 Ceiling side plate 32c, 34c Opening assisting portion 32d, 34d Upper end surface 33 Ceiling front plate 33a Insertion hole 36, 37 Thermal bonding part (first bonding part)
38 Thermal bonding part (second bonding part)
38a Central part 38b Intersection seal part 39, 40 Thermal adhesive part (third adhesive part)
41, 42 Thermal bonding part (fourth bonding part)
51, 52 Cutting line 61 Outer surface adhesive layer 62 Paper substrate layer 63 Interlayer adhesive layer 67 Coated paper 68 Print layer 72 Intermediate layer 72a Barrier substrate layer 72b Barrier layer 73 Interlayer adhesive layer 74 Inner surface adhesive layer 80 Side fold line 90 Fold line 91 Back inclined fold line 93 Front inclined fold line 100 Blank plate H Top adhesive part A1 to A3 Cut length B1 to B3 Horizontal period C1 to C3 Vertical period D Scratch D1 to D3 Cut E Scratch group area E0 Not Scar group area S Cutting member X Horizontal direction Y Vertical direction

Claims (15)

A blank in which an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, and an inner surface adhesive layer having thermoplasticity are laminated in order from the outer surface side, and a barrier layer having gas barrier properties is provided on the inner surface of the paper base material layer. In a bevel top type paper container comprising a cylindrical barrel having a rectangular cross section, an inclined roof that closes the top surface of the barrel, and a bottom that closes the bottom of the barrel,
A paper container, wherein the barrier layer comprises a coating film. The paper container according to claim 1, wherein the coating amount of the coating film is 10 g / m ² or more.   The paper container according to claim 1 or 2, wherein the coating film is made of any one of PVA, zinc acrylate, alumina phosphate, and TEOS. The inclined roof portion is inclined to face the front and back of the ceiling front plate and the ceiling rear plate, the pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and the upper end of the ceiling side plate A first adhesive portion that is folded in two and adhered by the outer surface adhesive layer, and a pair of protrusion portions that protrude above the ceiling side plate and are provided on the ceiling front plate and the ceiling rear plate, respectively. A second adhesive portion bonded to each other, a third adhesive portion in which upper end portions of the ceiling side plate and the ceiling front plate are bonded to each other by the inner surface adhesive layer, and upper end portions of the ceiling side plate and the ceiling back plate. A fourth adhesive portion adhered to each other by the inner surface adhesive layer,
In the ceiling front plate, a pair of front inclined fold lines that are inclined so as to approach each other as it goes upward from both side ends of the lower portion of the ceiling front plate are provided,
4. The ceiling back plate is provided with a pair of back inclined fold lines that are inclined so as to approach each other as they go upward from both side ends of the lower portion of the ceiling back plate. Crab paper container. The trunk portion has a pair of side plates disposed below the ceiling side plates;
5. The paper container according to claim 4, further comprising a side fold line extending in a vertical direction through a central portion in the horizontal direction of the ceiling side plate and the side plate.   The paper container according to claim 5, wherein the side fold line is divided at a boundary between the ceiling side plate and the side plate.   The paper container according to any one of claims 4 to 6, wherein a first notch is provided in a central portion of the upper end surface of the ceiling back plate.   The paper container according to claim 7, wherein a second notch is provided in a central portion of the upper end surface of the ceiling front plate.   The paper container according to any one of claims 4 to 8, wherein a third notch is provided in a central portion of an upper end surface of the pair of ceiling side plates.   In the second adhesive portion, the protruding portion is formed with a number of scratches having both ends of an inner end surface of the inner surface adhesive layer and an intermediate portion in the thickness direction of the paper base material layer. The paper container in any one of Claims 4-9.   In the upper end portion of the third bonding portion, the ceiling side plate and the ceiling front plate are formed with a large number of scratches, and in the upper end portion of the fourth bonding portion, the ceiling side plate and the ceiling back plate are The paper container according to claim 10, wherein many scratches are formed. In order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base layer made of paper, and an inner surface adhesive layer having thermoplastic properties are laminated, and a barrier layer comprising a coating film having gas barrier properties on the inner surface of the paper base material layer A cylindrical body having a rectangular cross section, an inclined roof that closes the top of the body, a bottom that closes the bottom of the body, and the inclined roof In the dismantling method of the paper bell type paper container provided with a resin pouring member,
The inclined roof portion is inclined to face the front and back of the ceiling front plate and the ceiling rear plate, the pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling back plate, and the upper end of the ceiling side plate A first adhesive portion that is folded in two and adhered by the outer surface adhesive layer, and a pair of protrusion portions that protrude above the ceiling side plate and are provided on the ceiling front plate and the ceiling rear plate, respectively. A second adhesive portion bonded to each other, a third adhesive portion in which upper end portions of the ceiling side plate and the ceiling front plate are bonded to each other by the inner surface adhesive layer, and upper end portions of the ceiling side plate and the ceiling back plate. A fourth adhesive portion adhered to each other by the inner surface adhesive layer,
A first peeling step of peeling the first adhesive part and the second adhesive part by applying a force in a direction in which the ceiling front plate and the ceiling back plate are separated;
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 a direction in which the ceiling back plate and the ceiling side plate are separated to pull the fourth adhesive portion. A second peeling step to peel off;
A method for disassembling a paper container. The trunk portion has a pair of side plates disposed below the ceiling side plates;
A folding step of folding the ceiling side plate and the side plate in half along a side fold line extending in a vertical direction through a central portion in the horizontal direction of the ceiling side plate and the side plate;
The method for disassembling a paper container according to claim 12, wherein the first peeling step is performed after the folding step.   The said 2nd adhesion part WHEREIN: The said protrusion part has many flaws which make the both ends the inner end surface of the said inner surface adhesion layer and the middle of the thickness direction of the said paper base material layer. Item 14. A method for disassembling a paper container according to Item 13. A longitudinal cutting step of cutting in a vertical direction from an upper end of the inclined roof portion opened by the first peeling step and the second peeling step to a lower end portion of the trunk portion;
A transverse cutting step of cutting the bottom end of the body portion in the circumferential direction to separate the bottom surface portion;
An extraction member removing step of cutting a predetermined region of the inclined roof portion and cutting off at least the extraction member;
15. The method for disassembling a paper container according to any one of claims 12 to 14, characterized by comprising:

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