JP6930083B2 - Paper container - Google Patents

Description

The present invention relates to a Goebel top type paper container for storing liquid contents.

A conventional Goebel top type paper container used for packaging alcoholic beverages, beverages, etc. is disclosed in Patent Document 1. This paper container is formed by laminating an outer surface adhesive layer on the outer surface of a paper base material layer and bending a blank plate on which a barrier layer and an inner surface adhesive layer are laminated in this order on the inner surface. The barrier layer prevents oxidative deterioration and taste deterioration of the contents.

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

The body is formed by bending a blank plate in an annular shape and adhering a glue margin at one end to the other end. An annular cut portion extending in a substantially horizontal direction is provided on the outer surface side of the barrier layer at the bottom and upper ends of the body portion. Further, a cutting portion extending in a substantially vertical direction is provided in the vicinity of the glue margin. Each cut portion is formed at a depth at which the paper base material layer is cut from the outer surface side of the blank plate. A pair of cut portions are provided adjacent to each other at the bottom of the body portion to form a band-shaped median strip.

In the paper container having the above configuration, when the user grabs one end of the strip-shaped median strip and applies a force in the direction along the cut portion after all the contents have been poured out, the paper base material layer of the strip-shaped median strip becomes a barrier. Peel off the layer. Next, when a finger is applied to the cut portion at the upper end of the strip-shaped median strip and a force is applied upward, the paper base material layer of the body portion is peeled from the barrier layer along the substantially vertical cut portion and the cut portion at the upper end. NS. Thereby, the paper base material layer and the barrier layer can be separated and the paper base material layer can be recycled. The top of the paper container, including the sloping roof, and the bottom of the paper container, including the bottom, are discarded.

Japanese Patent No. 5622109 (pages 4, 5, 10, 11, 11, 1 and 4)

However, according to the conventional paper container, the amount of recyclable paper is reduced because the top and bottom of the paper container are discarded. Therefore, there is a problem that the recyclability of the paper container is deteriorated.

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

In order to achieve the above object, the present invention presents in order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer in which a barrier layer having gas barrier property is arranged on one surface, and thermoplasticity. In a Goebel-top type paper container composed of a blank plate in which an inner surface adhesive layer having the above-mentioned material is laminated and a peeling layer is arranged between the paper material layer and the barrier layer so that both can be peeled off.
A tubular body having a rectangular cross section having a plurality of peripheral plates connected in the circumferential direction and a first glue margin piece connected to the peripheral plate at one end and adhered to the peripheral plate at the other end. When,
Includes a plurality of ceiling circumferential surface plate that is continuously provided above each of the peripheral surface plate, and a second margin pieces to be bonded with continuously provided to the ceiling peripheral surface plate at one end to the said ceiling circumferential surface plate at the other end And the sloping roof that closes the top of the body,
The bottom surface that closes the bottom surface of the body and
A folded portion in which the second glue margin piece is folded back in the circumferential direction and adhered to the ceiling peripheral plate, and a folded portion.
A peeling start portion formed of a notch provided at the upper end portion of the ceiling peripheral plate to be adhered to the folded portion so as to face the folded portion.
An annular cut portion arranged at the bottom of the body portion and extending substantially horizontally toward the outer surface side of the barrier layer,
It is characterized by including a first notch which is an edge of the peripheral plate that overlaps the first glue margin piece and is arranged on an extension of the cut portion or below the cut portion.

According to this configuration, the sloping roof is opened when the paper container is dismantled. Next, the ceiling peripheral plate adhered to the second glue margin piece is peeled off from the peeling start portion, and the paper base material layer and the barrier layer are separated from each other with the inner surface adhesive layer and the barrier layer fixed to the folded portion. It is peeled off by the peeling layer. As a result, when the peeling proceeds downward along the edge of the ceiling peripheral plate from the peeling start portion, the peeling proceeds continuously along the edge of the peripheral plate adhered to the first glue margin piece, and the first notch To reach. Then, when the peeling direction is changed in the circumferential direction of the body portion starting from the first notch, the peeling proceeds in the circumferential direction while the paper base material layer is cut. At this time, the cutting of the paper base material layer proceeding in the circumferential direction starting from the first notch joins the cut portion. After that, the peeling proceeds in the circumferential direction while the paper base material layer is cut along the cut portion. As a result, the paper base material layer and the barrier layer are sequentially peeled off from each ceiling peripheral plate and each peripheral plate while cutting the paper base material layer in the circumferential direction at the cutting portion. Therefore, the paper base material layer between the upper end of the paper container and the cut portion is peeled from the barrier layer.

Further, the present invention is characterized in that, in the paper container having the above structure, the cut portion is formed by a half cut formed on the inner surface side of the paper base material layer.

Further, the present invention is characterized in that, in the paper container having the above structure, a second notch is provided at the upper end of the ceiling peripheral plate adjacent to the second glue margin piece so as to be arranged close to the second glue margin piece. It is supposed to be.

Further, the present invention is characterized in that, in the paper container having the above structure, a second notch arranged at the upper end of the boundary between the second glue margin piece and the ceiling peripheral plate adjacent to the second glue margin piece is provided. It is said.

Also in the paper container of the present invention the above structure, the plurality of the ceiling circumferential surface plate, and a ceiling front plate and the ceiling rear plate opposite inclined, a pair of right and left roof that connects the ceiling rear plate and the ceiling front plate is composed from the side and plate, Rutotomoni, adjacent said second margin piece on one of the roof side plate, said ceiling front plate and the ceiling backplate projecting a pair of projecting upward from the ceiling side plate It is characterized in that an opening start portion formed of a notch extending in the horizontal direction is formed at both side ends of the protruding portion protruding from the ceiling front plate.

According to the present invention, the paper base material layer and the barrier layer of the Goebel top type paper container can be easily separated. Therefore, the amount of recyclable paper can be increased, and the recyclability of the paper container can be improved.

A perspective view of the paper container of the first embodiment of the present invention as viewed from the front side. Perspective view of the paper container of the first embodiment of the present invention as viewed from the back side. Side sectional view of the upper end portion of the paper container according to the first embodiment of the present invention. Top sectional view of the upper end of the paper container according to the first embodiment of the present invention. A development view showing a blank plate of a paper container according to the first embodiment of the present invention. Sectional drawing which shows the layer structure of the blank plate of the paper container of 1st Embodiment of this invention. Top sectional view of the glue margin piece portion of the upper end portion of the paper container according to the first embodiment of the present invention. A perspective view showing a state after the heat-bonded portion peeling step of the paper container of the first embodiment of the present invention. Top view showing the state after the barrier layer peeling step of the paper container of 1st Embodiment of this invention. A development view showing a blank plate of a paper container according to a second embodiment of the present invention. A development view showing a blank plate of a paper container according to a third embodiment of the present invention. A development view showing a blank plate of a paper container according to a fourth embodiment of the present invention. A cross-sectional view showing a layer structure of a blank plate of a paper container according to a fifth embodiment of the present invention.

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

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

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

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

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

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

The ceiling front plate 33 and the ceiling back plate 31 have projecting portions 33b, 31b protruding above the ceiling side plates 32, 34. The protruding portions 33b and 31b are heat-bonded by the inner surface adhesive layer 74 (see FIG. 6) on the inner surface thereof, which will be described later, to form the heat-bonded portion 38.

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

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

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

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

The glue margin pieces 15, 25, and 35 are provided with folded portions 15a, 25a, and 35a that are folded back by skive hemming processing, which will be described later. Further, a peeling start portion 31e formed of a notch is formed at the upper end portion of the ceiling back plate 31. The peeling start portion 31e is formed in a rectangular shape so as to reach the side edge of the ceiling back plate 31. The peeling start portion 31e may be formed in another shape such as a fan shape or a triangular shape.

The lower end of the peeling start portion 31e is arranged above the folding line 90 at the lower ends of the heat-bonding portions 41 and 42 formed on the ceiling back plate 31. Thereby, leakage of the contents can be prevented. It is more desirable to form the distance G between the lower end of the peeling start portion 31e and the folding line 90 at the lower ends of the heat-bonding portions 41 and 42 to be 10 mm or more. At this time, if the lower end of the peeling start portion 31e is formed within 6 mm from the upper end of the ceiling back plate 31, the deterioration of the aesthetic appearance of the paper container 1 can be suppressed.

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

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

Further, an annular cutting line (cutting portion) 51 extending in the horizontal direction is provided at the bottom of the back plate 11, the side plate 12, the front plate 13 and the side plate 14 of the body portion 10.

The distance H1 between the cutting line 51 and the folding line 90 at the lower end of the body portion 10 is formed to be 35 mm or less. This makes it possible to increase the amount of paper that is peeled off and recycled on the cutting line 51 as described later. By forming the distance H1 to 25 mm or more, it is possible to suppress a decrease in the strength of the paper container 1.

Further, a notch (first notch) 51a is provided at one end of the back plate 11 on the extension of the cutting line 51 or below the cutting line 51. The notch 51a comprises an I notch, a V notch or a U notch. The distance W1 between the cutting line 51 and the notch 51a is preferably formed to be 0 mm to 5 mm. As a result, when the paper base material layer 62 is cut in the circumferential direction starting from the notch 51a as described later, it can be easily merged with the cutting line 51.

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

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

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

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

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

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

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

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

In the present embodiment, the peel strength of the peeling layer 79 (between the resin ink 64 and the resin ink 71) is 0.05 N / 15 mm width or more and less than 1 N / 15 mm width. The peel strength is measured by a method of peeling from one end of a blank plate 100 having a width of 15 mm in a direction parallel to the peel surface, and the tensile speed is 300 mm / min.

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

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

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

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

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

Further, the cutting line 51 is provided on the outer surface side of the barrier layer 72b, and is formed by a half cut cut from the inner surface of the paper base material layer 62. As a result, one end of the cutting line 51 in the depth direction is on the inner surface of the paper base material layer 62, and the other end is in the layer of the paper base material layer 62.

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

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

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

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

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

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

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

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

FIG. 7 is a top sectional view of the upper end portion of the inclined roof portion 30, showing the glue margin piece 35 portion. Since the glue margin piece 35 is skive-hemmed, the folded-back portion 35a is heat-bonded to the protruding portion 31b of the ceiling back plate 31. At this time, the peeling start portion 31e provided on the ceiling back plate 31 faces the folded-back portion 35a, and the folded-back portion 35a is exposed via the peeling start portion 31e.

Further, the inner end of the peeling start portion 31e in the horizontal direction is arranged on the folded-back portion 35a. As shown in the figure, the blank plate 100 (see FIG. 5) has three layers on the outer side of the folded-back portion 35a, and the blank plate 100 has four layers on the folded-back portion 35a. At the time of frame sealing forming the heat-bonded portion 38, it is difficult to sufficiently apply pressure because the thickness of the three-layer portion of the side end portion is small. Therefore, when the peeling start portion 31e is not provided, the adhesive strength between the side end portion of the protruding portion 31b and the glue margin piece 35 is weak, and the peeling easily occurs at the interface between the two.

On the other hand, since the four-layer portion on the folded-back portion 35a has a large thickness, sufficient pressure can be applied at the time of frame sealing, and strong adhesive strength can be obtained between the protruding portion 31b and the folded-back portion 35a. Therefore, the side end portion of the protruding portion 31b outside the folded-back portion 35a is removed by the peeling start portion 31e, and the horizontal inner end of the peeling start portion 31e is provided on the folded-back portion 35a. As a result, the interior portion 70 (see FIG. 6) of the protruding portion 31b and the folded-back portion 35a can be firmly adhered to each other inside the peeling start portion 31e. Therefore, the interior portion 70 and the exterior portion 60 (see FIG. 6) of the protruding portion 31b can be stably peeled off.

At this time, if the distance D between the horizontal inner end of the peeling start portion 31e and the horizontal inner end of the folded portion 35a is formed to be 0.5 mm or more, the protruding portion 31b and the folded portion 35a are surely adhered to each other. be able to. It is more desirable to form the distance D to 2 mm to 8 mm.

The paper container 1 is disassembled after all the contents have been poured out. The dismantling work of the paper container 1 is performed in the order of the heat-bonded portion peeling step and the barrier layer peeling step.

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

Similarly, as shown by the arrow A2 in FIG. 2, a force is applied in the direction away from the ceiling front plate 33 and the ceiling back plate 31 by the fingers inserted above the ceiling side plate 32. As a result, the remaining right half of the heat-bonded portion 38 (see FIG. 3) between the ceiling front plate 33 and the ceiling back plate 31 is peeled off, and the heat-bonded portion 36 (see FIG. 4) of the ceiling side plate 32 is peeled off. Is done. FIG. 8 shows a perspective view of the upper part of the paper container 1 after the heat-bonded portion peeling step, and the upper end of the inclined roof portion 30 becomes X-shaped by the heat-bonded portion peeling step.

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

Next, in the barrier layer peeling step, the folded-back portion 35a of the glue margin piece 35 exposed from the peeling start portion 31e is grasped and separated from the protruding portion 31b of the ceiling back plate 31. At this time, the inner surface adhesive layer 74 of the folded-back portion 35a and the inner surface adhesive layer 74 of the ceiling back plate 31 are firmly adhered to each other. Therefore, in a state where the interior portion 70 of the ceiling back plate 31 is fixed to the folded-back portion 35a, the exterior portion 60 and the interior portion 70 at the upper end of the ceiling back plate 31 are separated by the release layer 79.

When the exterior portion 60 is pulled downward along the edge of the ceiling back plate 31 starting from the peeling start portion 31e to peel off, the peeling proceeds continuously along the edge of the back plate 11 and is below the cutting line 51. It reaches the notch 51a provided in.

Then, when the peeling direction is changed in the circumferential direction with the notch 51a as the starting point, the exterior portion 60 of the back plate 11 is peeled in the circumferential direction while being cut. At this time, since the exterior portion 60 is pulled upward, the cutting direction of the exterior portion 60 deviates upward and joins the cutting line 51. After that, the exterior portion 60 of the ceiling back plate 31 and the back plate 11 is peeled off from the interior portion 70 along the cutting line 51.

Since the user can easily grip the exterior portion 60 including the paper base material layer 62 with the notch 51a, the interior portion including the barrier layer 72b of the exterior portion 60 including the paper base material layer 62 from the notch 51a. Peeling from 70 can also be easily initiated.

The exterior portion 60 of the ceiling side plate 32 and the side plate 12, the ceiling front plate 33 and the front plate 13, the ceiling side plate 34 and the side plate 14 is peeled from the interior portion 70 while cutting the exterior portion 60 in the circumferential direction along the cutting line 51. Will be done. As a result, the exterior portion 60 between the upper end of the paper container 1 and the cutting line 51 is peeled off from the interior portion 70.

Further, the cutting line 51 is formed by a half cut that cuts the paper base material layer 62 from the inner surface side. Therefore, it is possible to prevent delamination in the paper base material layer 62 when the exterior portion 60 pulled to the outer surface side is peeled off. Therefore, it is possible to prevent the paper base material layer 62 from remaining above the cutting line 51.

Then, after the peeling progresses to the fold line 90 arranged at the boundary between the glue margin piece 35 and the ceiling side plate 34, the exterior portion 60 of the ceiling side plate 34 and the side plate 14 is cut downward along the fold line 90. While peeling off from the interior portion 70.

At this time, the paper is recycled by cutting the exterior portion 60 along the fold line 90 arranged at the boundary between the glue margin piece 35 and the ceiling side plate 34 and the boundary between the glue margin piece 15 and the side plate 14. The amount of can be increased.

As a result, as shown in FIG. 9, the inclined roof portion 30 and the exterior portion 60 of the body portion 10 are separated and peeled off. Since the injection member 3 is fixed to the inner surface adhesive layer 74, it is removed from the exterior portion 60.

Therefore, the paper container 1 is disassembled, and the exterior portion 60 including the paper base material layer 62 provided on the inclined roof portion 30 and the body portion 10 is recycled. Further, the interior portion 70 of the inclined roof portion 30, the interior portion 70 of the body portion 10, and the bottom portion 20 are discarded.

According to the present embodiment, since the peeling start portion 31e facing the folded-back portion 35a of the glue margin piece 35 (second glue margin piece) is provided on the ceiling back plate 31 (ceiling peripheral plate), the peeling start portion 31e to the ceiling back The exterior portion 60 including the paper base material layer 62 of the face plate 31 and the interior portion 70 including the barrier layer 72b can be easily peeled off. Further, since the annular cutting line 51 (cutting portion) is provided at the bottom of the body portion 10, the paper base material layer 62 peeled off from the ceiling back plate 31 can be easily peeled off in the circumferential direction. Therefore, the amount of recyclable paper can be increased, and the recyclability of the paper container 1 can be improved.

Further, since the notch 51a (first notch), which is the edge of the back plate 11 (peripheral plate) overlapping the glue margin piece 15 (first glue margin piece) and is arranged below the cutting line 51, is provided. The exterior portion 60 that has been peeled downward beyond the cutting line 51 is peeled in the circumferential direction starting from the notch 51a. As a result, the exterior portion 60 pulled upward can be merged with the cutting line 51 and can be reliably peeled off along the cutting line 51.

Further, since the cutting line 51 (cutting portion) is composed of a half cut formed on the inner surface side of the paper base material layer 62, the paper at the time of peeling of the exterior portion 60 pulled toward the outer surface side along the cutting line 51. Delamination in the base material layer 62 can be prevented. Therefore, the residue of the paper base material layer 62 above the cutting line 51 can be prevented, and the amount of recyclable paper can be increased.

In the present embodiment, the peeling start portion 31e is formed by a notch reaching on the side end surface of the ceiling back plate 31, but is formed by a notch or notch such as an I notch or a V notch facing the folded-back portion 35a. You may. At this time, in the barrier peeling step, the outside of the peeling start portion 31e (the side of the ceiling side plate 34) is gripped together with the folded-back portion 35a and pulled away from the inside of the peeling start portion 31e of the ceiling back plate 31. As a result, the paper base material layer 62 of the ceiling back plate 31 is broken, and the exterior portion 60 is peeled off in a state where the interior portion 70 inside the peeling start portion 31e is adhered to the folded-back portion 35a. Then, the exterior portion 60 can be peeled off by inserting a finger between the peeled interior portion 70 and the exterior portion 60 and pulling the finger apart.

<Second Embodiment>
FIG. 10 shows a developed view of the blank plate 100 of the paper container 1 of the second embodiment. In this embodiment, as opposed to the first embodiment, a notch (second notch) 53a is provided on the upper end surface 34d of the ceiling side plate 34 in the vicinity of the glue margin piece 35. Other parts are the same as those in the first embodiment.

The notch 53a comprises an I notch, a V notch or a U notch. The distance W2 between the notch 53a and the folding line 90 adjacent thereto is formed to be 0 mm to 25 mm. When the distance W2 is larger than 25 mm, the amount of the paper base material layer 62 to be recycled is reduced. Further, the amount of recycled paper can be increased by setting the distance W2 to 0 mm and arranging the notch 53a at the upper end of the folding line 90 arranged at the boundary between the glue margin piece 35 and the ceiling side plate 34. can.

In the barrier layer peeling step, the exterior portion 60 is peeled from the interior portion 70 while being cut along the cutting line 51, and after the peeling of the ceiling side plate 34 proceeds to the notch 53a, the ceiling side plate 34 and the side are started from the notch 53a. The exterior portion 60 is peeled off from the interior portion 70 while cutting the exterior portion 60 of the face plate 14 downward. At this time, the paper is recycled by cutting the exterior portion 60 along the fold line 90 arranged at the boundary between the glue margin piece 35 and the ceiling side plate 34 and the boundary between the glue margin piece 15 and the side plate 14. The amount of can be increased.

According to the present embodiment, a notch 53a (second notch) arranged close to the second glue margin 35 is provided at the upper end of the ceiling side plate 34 adjacent to the glue margin piece 35 (second glue margin piece). , The paper base material layer 62 peeled off from the ceiling side plate 34 starting from the notch 53a can be peeled off while being easily cut downward.

Further, by arranging the notch 53a at the upper end of the boundary between the glue margin piece 35 (second glue margin piece) and the ceiling side plate 34 adjacent to the glue margin piece 35 (distance W2 is 0 mm), the recycled paper The amount can be increased.

<Third Embodiment>
FIG. 11 shows a developed view of the blank plate 100 of the paper container 1 of the third embodiment. In this embodiment, the opening start portion 33c is provided on the ceiling front plate 33 as compared with the second embodiment. Other parts are the same as those in the second embodiment.

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

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

In the heat-bonding portion peeling step of disassembling the paper container 1 having the above configuration, the side end portion of the heat-bonding portion 38 has a small distance between the ceiling side plates 32 and 34 and the opening start portion 33c, so that it is easy to reach the opening start portion 33c from below. Can be peeled off. Then, the protrusion 31b and the protrusion 33b are separated from each other while the inner surface adhesive layer 74 and the barrier base material layer 72a of the protrusion 33b are torn from the opening start portion 33c.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the opening start portion 33c formed of the notch or notch of the blank plate 100 is provided at both end portions of the protruding portion 33b, the heat-bonded portion 38 can be easily peeled off in the heat welding portion peeling step.

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

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

Similar to the opening start portion 33c, the opening start portion formed by cutting the blank plate 100 in the horizontal direction and forming a notch (I notch) may be provided at both side ends of the protruding portion 31b of the ceiling back plate 31. As a result, the heat-bonded portion 38 can be more easily peeled off in the heat-welded portion peeling step.

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

<Fourth Embodiment>
FIG. 12 shows a developed view of the blank plate 100 of the paper container 1 of the fourth embodiment. In the present embodiment, the release agent 69 is applied to a plurality of regions (indicated by hatching in the figure) on both sides and the central portion in the upper part of the ceiling side plates 32 and 34 as compared with the first embodiment. Other parts are the same as those in the first embodiment.

By applying the release agent 69 to both sides of the ceiling side plates 32 and 34, the fingers inserted above the ceiling side plates 32 and 34 as shown by arrows A1 in FIG. 1 and arrow A2 in FIG. The heat-bonded portions 36 and 37 can be more easily peeled off when a force is applied in the direction away from the ceiling front plate 33 and the ceiling back plate 31.

Further, the release agent 69 applied to the central portion of the ceiling side plates 32 and 34 is applied at a predetermined distance from the upper ends of the ceiling side plates 32 and 34. As a result, the adhesive strength of the upper ends of the ceiling side plate 32 and the ceiling side plate 34 that are folded in half can be increased.

<Fifth Embodiment>
FIG. 13 is a cross-sectional view showing the layer structure of the blank plate 100 of the paper container 1 of the fifth embodiment. In this embodiment, the cutting line 51 is provided on the outer surface side of the barrier layer 72b and is formed by a half cut cut from above the outer surface of the blank plate 100, as opposed to the first embodiment. Other parts are the same as those in the first embodiment. The cutting line 51 may be formed by a perforated half-cut.

According to the present invention, it can be used as a Goebel top type paper container for storing liquid contents.

1 Paper container 2 Main body 3 Injection member 10 Body 11 Back plate 12, 14 Side plate 13 Front plate 15, 25, 35 Glue allowance pieces 15a, 25a, 35a Folded part 20 Bottom part 21 to 24 Bottom plate 30 Inclined roof Part 31 Ceiling back plate 31b, 33b Protruding part 31c, 33c Opening start part 31d, 33d Non-adhesive part 31e Peeling start part 32, 34 Ceiling side plate 32d, 34d Top surface 33 Ceiling front plate 33a Insertion hole 36, 37 Thermal adhesion part 38 Heat-bonded parts 39, 40 Heat-bonded parts 41, 42 Heat-bonded parts 51 Cutting line 51a Notch (first notch)
53a notch (second notch)
60 Exterior part 61 Outer surface adhesive layer 62 Paper base material layer 63 Interlayer adhesive layer 64 Resin ink 65 Anchor coating agent 68 Printing layer 69 Release agent 70 Interior part 79 Release layer 71 Resin ink 72 Intermediate layer 72a Barrier base material layer 72b Barrier layer 73 Interlayer adhesive layer 74 Inner surface adhesive layer 75 Anchor coating agent 90 Folded line 100 Blank plate

Claims (5)

In order from the outer surface side, an outer adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer having a barrier layer having gas barrier property arranged on one surface, and an inner surface adhesive layer having thermoplasticity are laminated, and the paper is laminated. In a Goebel top type paper container composed of a blank plate in which a peeling layer that enables peeling of both is arranged between a material layer and the barrier layer.
A tubular body having a rectangular cross section having a plurality of peripheral plates connected in the circumferential direction and a first glue margin piece connected to the peripheral plate at one end and adhered to the peripheral plate at the other end. When,
Yes a plurality of ceiling circumferential surface plate to be respectively continuously provided above each of the peripheral surface plate, and a second margin pieces to be bonded with continuously provided to the ceiling peripheral surface plate at one end to the said ceiling circumferential surface plate at the other end And the sloping roof that closes the top of the body,
The bottom surface that closes the bottom surface of the body and
A folded portion in which the second glue margin piece is folded back in the circumferential direction and adhered to the ceiling peripheral plate, and a folded portion.
A peeling start portion formed of a notch provided at the upper end portion of the ceiling peripheral plate to be adhered to the folded portion so as to face the folded portion.
An annular cut portion arranged at the bottom of the body portion and extending substantially horizontally toward the outer surface side of the barrier layer,
A paper container comprising: an edge of the peripheral plate that overlaps the first glue margin piece and a first notch that is arranged on an extension of the cut portion or below the cut portion. The paper container according to claim 1, wherein the cut portion is formed of a half cut formed on the inner surface side of the paper base material layer. The first or second aspect of the present invention, wherein a second notch arranged in the vicinity of the second glue margin is provided at the upper end of the ceiling peripheral plate adjacent to the second glue margin. Paper container. The first or second aspect of the present invention, wherein a second notch is provided at the upper end of the boundary between the second glue margin piece and the ceiling peripheral plate adjacent to the second glue margin piece. Paper container. The plurality of ceiling circumferential surface plate, and a ceiling front plate and the ceiling rear plate opposite inclined, the ceiling and a pair of left and right roof side plate front plate and connecting with the ceiling backplate consists Rutotomoni, whereas The second glue margin piece is adjacent to the ceiling side plate of
The ceiling front plate and the ceiling back plate have a pair of protrusions protruding upward from the ceiling side plate, and both side ends of the protrusions protruding from the ceiling front plate consist of notches extending in the horizontal direction. The paper container according to any one of claims 1 to 4, wherein an opening start portion is formed.

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