JP6707983B2 - Liquid storage container and disassembling method thereof - Google Patents

Description

The present invention relates to a liquid storage container that stores liquid contents and a method for disassembling the same.

A conventional liquid storage container for storing a liquid content is disclosed in Patent Document 1. This liquid container is formed by bending a blank plate in which a barrier layer is releasably laminated on the inner surface side of a paper base material layer, and the upper and lower surfaces of a tubular body are closed by the top and bottom surfaces, respectively. .. A pouring member having an opening for pouring a liquid is provided on the top surface of the liquid container.

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. At the bottom and the upper end of the body, annular cut portions extending in a substantially horizontal direction are provided on the outer surface side of the barrier layer. Further, a cutting portion extending in a substantially vertical direction is provided near the margin of the glue. Each cutting portion is formed to a depth at which the paper base material layer is cut from the outer surface side of the blank plate. A pair of cutting portions are provided adjacent to each other on the bottom portion of the body portion to form a strip-shaped separating strip.

In the liquid storage container having the above configuration, when the user grips one end of the strip-shaped separator and applies force in the direction along the cut portion after all the contents have been poured out, the paper base layer of the strip-shaped separator is Peel from the barrier layer. Next, when a finger is applied to the cut portion at the upper end of the strip-shaped separator and a force is applied upward, the paper base material layer of the body portion is separated from the barrier layer along the substantially vertical cut portion and the cut portion of the upper end portion. It 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 liquid storage container including the top surface and the bottom of the liquid storage container including the bottom are incinerated.

Japanese Patent No. 5622109 (4th page, 5th page, 10th page, 11th page, FIG. 1 and FIG. 4)

However, according to the conventional liquid storage container described above, since the paper base material layer is cut from the outer surface side of the blank plate to form the cut portion, the cut portion is cut to the middle in the thickness direction of the paper base material layer due to a processing error. Be done. In this case, when the paper base material layer is peeled off from the barrier layer along the cut portion, the paper base material layer is pulled to the outer surface side, so that cutting occurs between the deepest portion of the cut portion and the inner surface of the paper base material layer. It is difficult to cause delamination within the paper base material layer. For this reason, the paper base material layer remains between the upper and lower cut portions, which may reduce the amount of paper that can be recycled. Therefore, there is a problem that the recyclability of the liquid storage container is poor. On the other hand, since the paper base material layer approaches the barrier layer, a defect occurs when the cut portion is cut into the barrier layer. Therefore, the yield of the liquid container decreases.

It is an object of the present invention to provide a liquid storage container that can improve yield and recyclability.

In order to achieve the above object, the present invention is composed of a blank plate having a release layer for separating the paper base layer and a barrier layer arranged on the inner surface side of the paper base layer from each other, A liquid storage container in which upper and lower surfaces of a tubular body are closed by a top surface portion and a bottom surface portion, respectively.
At least a bottom portion of the body portion is provided with an annular first cutting portion extending in a substantially horizontal direction on the outer surface side of the barrier layer,
It is characterized in that the first cutting portion is constituted by a half cut formed on the inner surface side of the paper base material layer.

With this configuration, when the liquid container is dismantled, the paper base material layer above the first cutting portion of the liquid container can be peeled off from the barrier layer.

According to the present invention, in the liquid storage container having the above-mentioned configuration, the body has a plurality of peripheral surface plates continuously arranged in a horizontal direction, and an adhesive margin piece arranged at one end thereof is bonded to the peripheral surface plate at the other end. It is preferable that a notch that is continuous with the first cutting portion is provided at an end edge of the peripheral plate that is configured in a closed state and that overlaps with the adhesive margin piece.

According to the present invention, in the liquid storage container having the above-mentioned configuration, a second cutting portion that extends in the vertical direction is provided on the outer surface side of the peripheral plate adjacent to the adhesive margin piece, on the outer surface side thereof, in proximity to the adhesive margin piece. It is preferable that the second cutting portion is formed to a depth that reaches at least the paper base material layer from the outer surface side of the blank plate.

Further, according to the present invention, in the liquid storage container having the above-mentioned configuration, it is preferable that a lower end of the second cutting portion is arranged above the first cutting portion or below the first cutting portion.

Further, the present invention is a liquid storage container having the above-mentioned configuration, wherein the liquid storage container is a Gobel top type, and a resin-made pouring member having an opening for pouring a liquid is provided on the top surface portion, and the pouring member is Is preferably in a state of being inserted into an insertion opening opened in the top surface portion and fixed to the inner surface of the blank plate.

Further, the present invention, in order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer having a barrier layer having a gas barrier property on one side, an inner surface adhesive layer having thermoplasticity. A peripheral plate composed of a blank plate laminated and having a peeling layer arranged between the paper base layer and the barrier layer to enable peeling of the both, and a plurality of peripheral plates continuously provided in the circumferential direction and one peripheral plate. Gobel equipped with a tubular body having a rectangular cross-section having a first adhesive margin bonded to the body, a sloping roof portion that covers the top surface of the body, and a bottom surface portion that closes the bottom surface of the body. In the method of disassembling the top type liquid storage container,
The sloping roof part includes a ceiling front plate and a ceiling rear plate that are inclined and opposed to each other in the front-rear direction, a pair of left and right ceiling side plates connecting the ceiling front plate and the ceiling rear plate, and one of the ceiling side plates. A second adhesive strip that is continuously provided and adhered to the ceiling back plate, a first adhesive portion in which the upper end portion of the ceiling side plate is folded in two and adhered by the outer surface adhesive layer, and A second adhesive portion, which is formed by adhering a pair of protruding portions protruding upward and respectively provided on the ceiling front plate and the ceiling rear plate to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling front plate. A third adhesive portion adhered to each other by an inner adhesive layer, a fourth adhesive portion in which upper ends of the ceiling side plate and the ceiling rear plate are adhered to each other by the inner adhesive layer, and a second adhesive margin piece is folded back in the circumferential direction. And a folded portion adhered to the ceiling back plate, and a first cut consisting of an annular half cut extending in a substantially horizontal direction that cuts at least the paper base material layer from the inner surface on the outer surface side with respect to the barrier layer. A part on the bottom of the body,
The fixing strength between the ceiling back plate and the second adhesive strip is higher than the fixing strength between the paper base layer and the barrier layer,
A first peeling step of peeling off the first adhesive portion and the second adhesive portion by applying a force in a direction in which the ceiling front plate and the ceiling rear plate are separated from each other;
With the third adhesive portion and the fourth adhesive portion adhered, the barrier layer and the paper base material layer are placed on the release layer from the open end of the ceiling back plate facing the second adhesive margin piece. A barrier layer peeling step of peeling the paper base material layer and cutting the paper base material layer on the first cutting portion,
It is characterized by having.

Further, the present invention, in order from the outer surface side, an outer surface adhesive layer having thermoplasticity, a paper base material layer made of paper, a barrier base material layer having a barrier layer having a gas barrier property on one side, an inner surface adhesive layer having thermoplasticity. A peripheral plate composed of a blank plate laminated and having a peeling layer arranged between the paper base layer and the barrier layer to enable peeling of the both, and a plurality of peripheral plates continuously provided in the circumferential direction and one peripheral plate. Gobel equipped with a tubular body having a rectangular cross-section having a first adhesive margin piece adhered to the In the method of disassembling the top type liquid storage container,
The sloping roof portion includes a ceiling front plate and a ceiling rear plate that are inclined and opposed to each other in the front-rear direction, a pair of left and right ceiling side plates that connect the ceiling front plate and the ceiling rear plate, and one of the ceiling side plates. A second adhesive strip that is continuously provided and adhered to the ceiling back plate, a first adhesive portion in which the upper end portion of the ceiling side plate is folded in two and adhered by the outer surface adhesive layer, and A second bonding portion that is formed by bonding a pair of projecting portions that protrude upward and are respectively provided on the ceiling front plate and the ceiling rear plate to each other by the inner surface adhesive layer, and the upper end portions of the ceiling side plate and the ceiling front plate. A third adhesive portion adhered to each other by an inner adhesive layer, a fourth adhesive portion in which upper ends of the ceiling side plate and the ceiling rear plate are adhered to each other by the inner adhesive layer, and a second adhesive margin piece is folded back in the circumferential direction. And a folded portion adhered to the ceiling back plate, and a first cut consisting of an annular half cut extending in a substantially horizontal direction that cuts at least the paper base material layer from the inner surface on the outer surface side with respect to the barrier layer. A part on the bottom of the body,
The fixing strength between the ceiling back plate and the second adhesive strip is higher than the fixing strength between the paper base layer and the barrier layer,
A first peeling step of peeling off the first adhesive portion and the second adhesive portion by applying a force in a direction in which the ceiling front plate and the ceiling rear plate are separated from each other;
A force is applied in a 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 rear plate and the ceiling side plate are separated from each other to the fourth adhesive portion. A second peeling step for peeling off the
The barrier layer and the paper base material layer are peeled off on the release layer from the open end of the ceiling back plate facing the second glue strip, and the paper base material layer is cut on the first cutting portion. A barrier layer peeling step to
It is characterized by having.

According to the liquid storage container of the present invention, the ring-shaped first cutting portion extending substantially horizontally is provided on the outer surface side of the barrier layer at least on the bottom side of the body portion, and the first cutting portion is the paper base layer. Is formed by a half cut formed on the inner surface side of the. As a result, it is possible to prevent delamination in the paper base material layer at the time of peeling, which is pulled to the outer surface side along the first cut portion. Therefore, it is possible to prevent the paper base material layer above the first cutting portion from remaining and increase the amount of paper that can be recycled. Further, since the first cutting portion does not cut the barrier layer, damage to the barrier layer is prevented. Therefore, the yield and recyclability of the liquid storage container can be improved.

According to the disassembling method of the present invention, the paper base layer and the barrier layer of the Goebeltop type liquid storage container can be easily separated. Therefore, the amount of paper that can be recycled can be increased, and the recyclability of the liquid storage container can be improved.

The perspective view which looked at the liquid storage container of 1st Embodiment of this invention from the front side. The perspective view which looked at the liquid storage container of 1st Embodiment of this invention from the back side. Side sectional view of the upper end of the liquid storage container of the first embodiment of the present invention Top sectional view of the upper end portion of the liquid storage container of the first embodiment of the present invention Development drawing which shows the blank board of the liquid storage container of 1st Embodiment of this invention. Sectional drawing which shows the laminated constitution of the blank board of the liquid storage container of 1st Embodiment of this invention. The perspective view which shows the state after the heat-bonding part peeling process of the liquid container of 1st Embodiment of this invention. A side sectional view of an adhesive margin piece portion of an upper end portion of the liquid storage container according to the first embodiment of the present invention. Sectional top view of the paste margin piece part of the upper end part of the liquid storage container of the first embodiment of the present invention The top view which shows the state after the barrier layer peeling process of the liquid container of 1st Embodiment of this invention. The perspective view which looked at the liquid storage container of 2nd Embodiment of this invention from the front side. The perspective view which looked at the liquid storage container of 2nd Embodiment of this invention from the back side. Sectional drawing which shows the laminated constitution of the blank board of the liquid storage container of 2nd Embodiment of this invention. The perspective view which looked at the liquid storage container of 3rd Embodiment of this invention from the front side. The perspective view which looked at the liquid storage container of 3rd Embodiment of this invention from the back side. Development view showing a blank plate of the liquid storage container of the third embodiment of the present invention Sectional drawing which shows the laminated constitution of the blank board of the liquid storage container of 3rd Embodiment of this invention. Sectional top view of the paste margin piece part of the upper end part of the liquid storage container of the third embodiment of the present invention Development view showing a blank plate of the liquid storage container of the fourth embodiment of the present invention Development view showing a blank plate of the liquid storage container of the fifth embodiment of the present invention Development view showing a blank plate of the liquid storage container of the sixth embodiment of the present invention Sectional drawing which shows the laminated constitution of the blank board of the liquid storage container of 6th Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a perspective view seen from the front side and a perspective view seen from the back side of the liquid storage container of the first embodiment, respectively. The liquid storage container 1 is configured as a Gobel top type, and includes alcoholic beverages (sake, wine, shochu, etc.), beverages (coffee, milk drink, juice, tea, etc.), seasonings (dressing, etc.) or sanitary products (shampoo, rinse, etc.). ) Etc. are filled with liquid contents.

The liquid storage 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 layer 62 (see FIG. 6) into a box shape. The spout member 3 is made of a resin molded product, forms a spout for the contents, and is opened and closed by the cap 3a.

In the main body 2, the bottom surface of the tubular 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 (top surface portion). The body portion 10 is formed in a rectangular horizontal cross section in which both side edges of a front plate 13 and a rear plate 11 which face 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 sequentially arranged in the horizontal direction to form a peripheral plate forming the peripheral surface of the body 10.

The sloping roof part 30 is formed by connecting both side ends of a ceiling front plate 33 (front part) and a ceiling rear plate 31 (rear part) which are inclined and opposed to each other, by a pair of left and right ceiling side plates 32, 34 (side parts). It 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 continuously provided above the side plate 12 and the side plate 14, respectively, and are arranged between the ceiling front plate 33 and the ceiling rear plate 31 inclining toward the inside. The ceiling back surface plate 31, the ceiling side surface plate 32, the ceiling front surface plate 33, and the ceiling side surface plate 34 are sequentially arranged in the horizontal direction to form a ceiling peripheral surface 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 sloping roof portion 30. Note that FIG. 3 shows a cross section passing through the ceiling side plate 32. The upper end portions of the ceiling side surface plate 32 and the ceiling side surface plate 34 are folded in two by valley folds, and are arranged between the upper end portion of the inclined ceiling front plate 33 and the upper end portion of the ceiling rear plate 31.

The upper end of the two-sided ceiling side plate 32 is heat-bonded by an outer surface adhesive layer 61 (see FIG. 6) described later to form a heat-bonded portion 36 (first bonded portion). The upper end of the two-sided ceiling side plate 34 is heat-bonded by the outer surface adhesive layer 61 (see FIG. 6) to form the heat-bonded part 37 (first bond).

The ceiling front plate 33 and the ceiling rear plate 31 have protrusions 33b and 31b that protrude above the ceiling side plates 32 and 34, respectively. The protrusions 33b and 31b are heat-bonded by the inner surface adhesive layers 74 (see FIG. 6) on the respective inner surfaces, which will be described later, to form the heat-bonded portions 38 (second bonding portions).

The upper end portions of the ceiling side surface plate 32 and the ceiling front surface plate 33 are heat-bonded by the inner surface adhesive layers 74 (see FIG. 6) on their inner surfaces to form a heat-bonded portion 39 (third bonded portion). The upper end portions of the ceiling side surface plate 34 and the ceiling front surface plate 33 are heat-bonded by the inner surface adhesive layers 74 (see FIG. 6) of the respective inner surfaces to form the heat-bonded portion 40 (third bonded portion).

The upper end portions of the ceiling side surface plate 32 and the ceiling rear surface plate 31 are heat-bonded by the inner surface adhesive layers 74 (see FIG. 6) on their inner surfaces to form a heat-bonded portion 41 (fourth bonded portion). The upper end portions of the ceiling side surface plate 34 and the ceiling rear surface plate 31 are heat-bonded by the inner surface adhesive layers 74 (see FIG. 6) on their inner surfaces to form a heat-bonded portion 42 (fourth bonded portion).

FIG. 5 shows a developed view of the blank plate 100 of the liquid storage container 1. A fold line 90 is provided at a predetermined position on the blank plate 100 in which the main body 2 of the liquid storage container 1 is developed, and the rectangular back plate 11, side plate 12, front plate 13, side plate 14, and glue margin piece 15 It is serially installed in order.

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

The glue margin piece 15 (first glue margin piece), the glue margin piece 25, and the glue margin piece 35 are respectively provided with folding-back portions 15a, 25a, and 35a that are folded back by a skive hemming process described later.

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

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

Further, an annular cutting line 51 (first cutting portion) extending in the horizontal direction is provided on the bottom side of the back plate 11, the side plate 12, the front plate 13 and the side plate 14 of the body part 10. A notch 51 a is provided at one end of the back plate 11 that overlaps the glue allowance piece 15. The notch 51a comprises a notch (I notch) or a notch (V notch) continuous with the cutting line 51.

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 50 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. It is more desirable to form the distance H1 to be 10 mm or more and 40 mm or less. As a result, it is possible to prevent the body portion 10 from buckling when the liquid container 1 is molded.

The ceiling side surface plate 34 and the side surface plate 14 at one end in the circumferential direction are provided with a cutting line 52 (second cutting portion) that is adjacent to the glue margin pieces 35 and 15 and extends in the vertical direction. The cutting line 52 is formed from the upper end of the ceiling side plate 34 to the cutting line 51 at the lower end of the side plate 14. The lower end of the cutting line 52 is arranged on the cutting line 51 or below the cutting line 51.

The distance H2 between the cutting line 52 and the folding line 90 adjacent thereto is formed to be 0 mm to 25 mm. When the distance H2 is larger than 25 mm, the recycled paper base material layer 62 is reduced. It is more desirable to form the distance H2 to 8 mm to 18 mm. If the distance H2 is smaller than 8 mm, the risk of bending on the cutting line 52 at the time of bending the adjacent folding lines 90 increases.

It should be noted that the cutting line 51 does not have to be provided on the blank plate 100 on the paste margin piece 15 side of the cutting line 52.

The blank plate 100 is bent at a folding line 90 and heat-bonded with the glue margin piece 15, the glue margin piece 25, and the glue margin piece 35 to form a tubular shape. That is, the glue margin piece 15 that is continuously provided to the side surface plate 14 at one end is heat-bonded to the rear surface plate 11 at the other end, so that the tubular body portion 10 that is closed in the circumferential direction is formed. The glue margin piece 25 that is connected to the bottom plate 24 at one end is heat-bonded to the bottom plate 21 at the other end, so that the bottom part 20 is formed in a state in which the bottom end is open and the bottom part is closed in the circumferential direction. The adhesive margin piece 35, which is continuously provided on the ceiling side plate 34 at one end, is heat-bonded to the ceiling back plate 31 at the other end, so that the sloping roof portion 30 is formed in a state in which the upper end is opened and the circumferential direction is closed. It

The bottom surface portion 20 is fixed by folding each of the bottom surface plates 21 to 24 along a folding line 90 and closing the bottom surface of the body portion 10 by heat bonding.

On the ceiling front plate 33 of the sloping roof portion 30, the pouring member 3 inserted into the insertion hole 33a is heat-bonded 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 a fold line 90, and the above-mentioned thermal bonding portions 36 to 42 are formed by thermal bonding. As a result, the sloping 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 part 60 and an interior part 70 which is arranged on the inner surface side of the exterior part 60 so as to be peelable from the exterior part 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 on the exterior portion 60 in 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 by printing.

The paper base layer 62 is formed of, for example, paperboard having a basis weight of 382 g/m ² . The outer adhesive layer 61 has thermoplasticity and is formed of, for example, a low-density polyethylene (LDPE) film having a thickness of 25 μm. The outer surface adhesive layer 61 constitutes a thermal adhesive layer for thermally bonding the outer surface of the blank plate 100. The outer surface of the outer surface adhesive layer 61 is subjected to corona treatment, and a printing layer 68 is formed at a predetermined position by gravure printing or offset printing. The interlayer adhesive layer 63 has thermoplasticity and is formed of, for example, an ethylene/methacrylic acid copolymer resin (EMAA) film having a thickness of 20 μm. A peeling layer 79, which will be described later, is bonded onto the paper base material layer 62 by the interlayer adhesive layer 63.

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

The resin ink 64 of the exterior portion 60 and the resin ink 71 of the interior portion 70 form a release layer 79 that can be released from each other. The peeling 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 made of, for example, shellac, and the resin ink 64 is made 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 separated from the blank plate 100. Therefore, the peeling layer 79 allows the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b to be peelable.

In this embodiment, the peeling 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 was measured by a method of peeling the blank plate 100 having a width of 15 mm at 180° with respect to the peel surface, and the pulling speed was 300 mm/min.

The intermediate layer 72 is formed by disposing the barrier layer 72b on one surface of the barrier base material layer 72a, and the barrier layer 72b is disposed 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 (eg, aluminum vapor deposition film) or an inorganic oxide vapor deposition film (eg, silica vapor deposition film, alumina vapor deposition film, etc.). As a result, the barrier layer 72b has a gas barrier property and can prevent permeation of oxygen, water vapor and the like into the liquid storage container 1. A metal foil such as an aluminum foil may be used as the barrier layer 72b. Further, the barrier layer 72b may be arranged on the inner surface side of the barrier base material layer 72a.

The interlayer adhesive layer 73 has thermoplasticity and is formed of, for example, a low-density polyethylene film having a thickness of 20 μm. The intermediate layer 72 and the inner surface adhesive layer 74 are adhered by the interlayer adhesive layer 73. The inner surface adhesive layer 74 has thermoplasticity and is formed of, for example, a linear low-density polyethylene (LLDPE) film having a thickness of 40 μm which is polymerized by using a metallocene catalyst. The inner surface adhesive layer 74 constitutes a thermal adhesive layer that thermally adheres the inner surface of the blank plate 100. The interlayer adhesive layer 73 may be made of a two-component curing type dry laminating adhesive such as urethane.

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

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

The 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. That is, the cutting line 51 is formed by a half cut formed on the inner surface side of the paper base material layer 62. As a result, the cutting line 51 has one end in the depth direction on the inner surface of the paper base material layer 62 and the other end inside the paper base material layer 62.

The cutting line 52 is provided on the outer surface side of the barrier layer 72b and is formed by continuous half cuts cut from the outer surface of the blank plate 100. Thereby, the cutting line 52 is formed at a depth reaching at least the paper base material layer 62 from the outer surface side of the blank plate 100. The cutting line 52 may be formed by perforating a half cut.

Further, the cutting line 52 formed on the outer surface of the blank plate 100 and extending in the vertical direction may be divided while avoiding the folding line 90 (see FIG. 5) extending in the horizontal direction. Further, the cutting line 52 may be formed in a perforated shape to avoid the folding line 90. As a result, it is possible to prevent appearance defects such as wrinkles of the folding line 90 due to the intersection with the cutting line 52.

The method of forming the liquid container 1 will be described below. First, the paper base material layer 62 wound into a roll is pulled out, and a cutting edge (not shown) cuts the paper base material layer 62 from the inner surface side to the outer surface side to provide a cutting line 51. After that, the anchor coating agent 65 is printed on both surfaces of the paper base layer 62. The cutting line 51 may be provided after printing the anchor coating agent 65 on both surfaces of the paper base layer 62.

Next, printing is performed in order of the resin inks 71 and 64 on the barrier layer 72b of the intermediate layer 72 by using a gravure plate to form the peeling layer 79. Thereby, the intermediate layer 72 in which the peeling 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 in which the outer surface adhesive layer 61 is laminated and the release layer 79 in which the intermediate layer 72 is laminated are laminated by the EC method via the interlayer adhesive layer 63.

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 together 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 printing layer 68 for drawing a design 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.

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

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 adhesive margin pieces 15, 25, and 35. .. The tubular body whose upper and lower surfaces are opened is installed in a filling and sealing device equipped with a carton assembling device and the like. The bottom plates 21 to 24 are folded by the filling and sealing device to form the bottom 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 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 sloping roof part 30 are bent with respect to the side plate 12 and the side plate 14, respectively, and the upper end portion is folded in two. A release agent 69 is applied to a predetermined area on the outer surface adhesive layer 61 at the upper end portions of the ceiling side surface plate 32 and the ceiling side surface plate 34. The outer surface adhesive layers 61 of the ceiling side plate 32 and the ceiling side plate 34 facing each other are partially heat-bonded with the release agent 69 sandwiched therebetween to form the heat-bonding 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, etc., and reduces the adhesive strength of the outer surface adhesive layer 61 for thermal adhesion.

At this time, the upper end portions of the ceiling side surface plate 32 and the ceiling side surface plate 34 and the upper end portion of the ceiling front surface plate 33 are heat-bonded to each other so that the inner surface adhesive layers 74 are opposed to each other, whereby the heat-bonded portions 39 and 40 are formed. Similarly, the upper end portions of the ceiling side surface plate 32 and the ceiling side surface plate 34 and the upper end portion of the ceiling rear surface plate 31 are heat-bonded to each other so that the inner surface adhesive layers 74 oppose each other to form the heat-bonded portions 41 and 42. One end of the ceiling side surface plate 34 and the adhesive margin piece 35 are heat-bonded to each other such that the inner surface adhesive layers 74 are opposed to each other. In addition, the inner surface adhesive layers 74 facing each other with the protruding portion 33b and the protruding portion 31b are heat-bonded to each other to form the heat-bonding portion 38. Thereby, the sloping roof portion 30 is formed, the top surface of the body portion 10 is closed, and the liquid storage container 1 shown in FIG. 1 is obtained.

At this time, the adhesive strength between the thermal adhesive 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).

The liquid container 1 is disassembled after all the contents are poured out. The disassembling operation of the liquid storage container 1 is performed in the order of the heat-bonding portion peeling step and the barrier layer peeling step.

In the heat-bonding portion peeling step (first peeling step), as shown by an arrow A1 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. .. As a result, 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.

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 rear plate 31 are separated by the fingers 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. Be done. FIG. 7 shows a perspective view of the upper part of the liquid storage container 1 after the heat-bonding part peeling step, and the upper end of the sloping roof part 30 becomes X-shaped by the heat-bonding part peeling step.

At this time, since the release agent 69 is arranged in a predetermined region inside 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.

FIG. 8 shows a side sectional view of the sloping roof portion 30 that passes through the adhesive margin piece 35, and FIG. 9 shows a top sectional view of the sloping roof portion 30 that passes through the upper end portion. Since the glue allowance piece 35 is skived hemming, the upper end portion of the glue allowance piece 35 is bent to the base portion 35b (front surface side portion) adhered to the ceiling front plate 33 and rearward with respect to the base portion 35b (periphery). And a folded-back portion 35a (back side portion) that is bonded to the ceiling back plate 31 (bent in the direction). At this time, the left-right length L2 of the folded-back portion 35a of the glue allowance piece 35 is shorter than the left-right length L1 of the base portion 35b of the glue allowance piece 35. For this reason, the circumferential end portion of the ceiling back plate 31 overlaps the base portion 35b of the adhesive margin piece 35, and does not overlap the folded portion 35a.

At this time, the ceiling front plate 33 and the glue strip 35 are folded back to the ceiling side plate 34. Further, the ceiling back plate 31 that overlaps the base portion 35b of the glue margin piece 35 has an open end 31k at the end in the circumferential direction. Further, the fixing strength between the ceiling back plate 31 and the adhesive margin piece 35 is higher than the fixing strength between the paper base material layer 62 and the barrier layer 72b. Therefore, when the base portion 35b of the adhesive margin piece 35 and the ceiling front plate 33 are separated from each other in the heat-bonding portion peeling step (first peeling step), the ceiling rear plate 31 is separated from the ceiling rear plate 31 by the upper end of the open end 31k of the ceiling rear plate 31. The interior portion 70 is easily pulled by the base portion 35b of the adhesive margin piece 35 and the ceiling front plate 33 and peeled off from the exterior portion 60. Further, since the open end of the folded back portion 35a of the glue allowance piece 35 is arranged inside the open end 31k of the ceiling back plate 31 (on the side surface ceiling plate 32 side), the open end of the folded back portion 35a of the glue allowance piece 35 is Peeling between the interior portion 70 and the exterior portion 60 is unlikely to occur.

Similarly, when the ceiling side plates 34 are separated from each other or when the ceiling side plate 34 and the paste margin piece 35 are separated from each other, the interior portion 70 of the ceiling back plate 31 is similarly attached to the base portions 35b of the ceiling side plate 34 and the glue margin piece 35. Be pulled. Further, the fixing strength of the ceiling side plate 32 and the ceiling side plate 34 that are folded in two and the fixing strength of the protrusion 33b of the ceiling front plate 33 and the protrusion 31b of the ceiling back plate 31 are determined by the paper base layer 62 and the barrier layer. It is higher than the fixing strength with 72b. As a result, a peeled portion PL where the exterior portion 60 is peeled from the interior portion 70 is formed at the upper end portion of the open end 31k of the ceiling back plate 31.

It should be noted that on the inner side of the adhesive margin piece 35 (on the side surface ceiling plate 32 side), the exterior portion 60 and the interior portion 70 of one of the ceiling front plate 33 and the ceiling rear plate 31 are separated by the peeling layer 79, and the thermal bonding portion 38 is separated. It can be easily torn off.

Further, in the present embodiment, the left-right length L2 of the folded portion 35a may be substantially the same as the left-right length L1 of the base portion 35b. Even in this case, if the peeling strength of the peeling layer 79 is 0.05 N/15 mm width or more and less than 1 N/15 mm width, the interior portion 70 of the ceiling back plate 31 is glued at the upper end of the open end 31k of the ceiling back plate 31. It is easily pulled by the base portion 35b of the piece 35 and the ceiling front plate 33 and peeled off from the exterior portion 60.

When the exterior portion 60 of the ceiling back plate 31 is pulled downward and peeled off, the exterior portion 60 of the back plate 11 is continuously peeled off and reaches the cutting line 51. As a result, the ceiling back plate 31 and the exterior part 60 of the back plate 11 are separated in the circumferential direction along the cutting line 51. At this time, the cutting line 51 is formed by half-cutting the paper base layer 62 from the inner surface side. Therefore, it is possible to prevent delamination within 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.

At this time, a notch 51a, which is a notch or a notch continuous with the cutting line 51, is provided on the edge of the back plate 11 that overlaps with the adhesive margin piece 15. As a result, the exterior portion 60 that is pulled downward and peeled off can be guided on the cutting line 51 and easily peeled off in the circumferential direction. 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. The stripping from 70 can also be easily initiated.

The sloping roof part 30 and the exterior part 60 of the body part 10 which are peeled off in the circumferential direction reach the cutting line 52 and are cut in the vertical direction. At this time, since the lower end of the cutting line 52 is arranged on the cutting line 51 or below the cutting line 51, it is possible to surely cut in the vertical direction. As a result, as shown in FIG. 10, the sloping roof part 30 and the exterior part 60 of the body part 10 are separated, and the paper base material layer 62 and the barrier layer 72b are separated. Since the pouring member 3 is fixed to the inner surface adhesive layer 74, it is removed from the exterior portion 60.

As a result, the liquid container 1 is dismantled, and the exterior part 60 including the paper base material layer 62 provided on the sloping roof part 30 and the body part 10 is recycled. Further, the interior portion 70 of the sloping roof portion 30, the interior portion 70 of the body portion 10, and the bottom surface portion 20 are discarded.

According to the present embodiment, an annular cutting line 51 (first cutting portion) extending substantially horizontally is provided on the outer surface side of the barrier layer 72b on the bottom side of the body portion 10, and the cutting line 51 is a paper base. It is configured by a half cut formed on the inner surface side of the material layer 62. As a result, it is possible to prevent delamination in the paper base material layer 62 at the time of peeling of the exterior part 60 that is pulled outward along the cutting line 51. Therefore, the paper base material layer 62 above the cutting line 51 can be prevented from remaining, and the amount of paper that can be recycled can be increased. Further, since the cutting line 51 is cut from the inner surface side of the paper base material layer 62, damage to the barrier layer 72b is prevented. Therefore, the yield and recyclability of the liquid container 1 can be improved.

Further, a notch 51 a continuous with the cutting line 51 is provided at the edge of the back plate 11 (peripheral plate) that overlaps with the adhesive margin piece 15. As a result, the exterior portion 60 that is pulled downward and peeled off can be guided on the cutting line 51 and easily peeled off in the circumferential direction. Further, since the user can easily grasp the exterior portion 60 including the paper base material layer 62 with the notch 51a, the interior portion 70 including the barrier layer 72b of the exterior portion 60 including the paper base material layer 62 is removed. The peeling can also be started easily. Since the back plate 11 overlaps the glue strip 25, the notch 51 a may penetrate the paper base layer 62 or the blank plate 100. Further, the notch 51a may be omitted.

In addition, a cutting line 52 (second cutting portion) extending in the up-and-down direction close to the paste margin piece 25 and outside the barrier layer 72b on the side surface plate (peripheral plate) adjacent to the paste margin piece 25 has a blank plate. It is formed to a depth reaching the paper base material layer 62 from the outer surface side of 100. Thereby, the exterior part 60 including the paper base material layer 62 to be peeled off from the interior part 70 including the barrier layer 72b can be easily separated.

Further, the lower end of the cutting line 52 is arranged on the cutting line 51 or below the cutting line 51. Thereby, the exterior part 60 including the paper base material layer 62 peeled from the barrier layer 72b in the circumferential direction can be reliably separated in the vertical direction.

Further, the resin-made pouring member 3 is provided in the sloping roof portion 30 (top surface portion), and the pouring member 3 is inserted into the insertion port 33 a opened in the sloping roof portion 30 and fixed to the inner surface of the blank plate 100. It will be in a state of being stuck. As a result, the pouring member 3 can be easily separated from the exterior portion 60 including the paper base material layer 62 integrally with the barrier layer 72b.

Further, the sloping roof part 30 (top surface part) is fixed to the upper end part of the inner surface of the ceiling front plate 33 (front part) and the upper end part of the inner surface of the adhesive margin piece 35 and the ceiling back plate 31 (rear part), and The fixing strength between the face plate 31 and the adhesive margin piece 35 (second adhesive margin piece) is higher than the adhesive strength between the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b. As a result, when the ceiling front plate 33 and the glue strip 35 are separated, the interior portion 70 including the barrier layer 72b at the upper end of the open end 31k of the ceiling back plate 31 is pulled by the ceiling front plate 33 and the glue strip 35. It is peeled off from the exterior part 60 including the paper base layer 62. As a result, a peeling portion PL is formed between the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b, and the user holds the peeling portion PL to hold the exterior covering including the paper base material layer 62. The part 60 can be easily peeled off from the interior part 70 including the barrier layer 72b.

Also, the fixing strength of the ceiling side plate 32 (side part) and the ceiling side plate 34 (side part) of the sloping roof part 30 that are folded and overlapped with each other, and the protrusion 33b (upper end part) of the ceiling front plate 33 (front part). The fixing strength of the ceiling back plate 31 (back surface) to the protrusion 31b (upper end) is higher than the fixing strength of the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b. As a result, when the ceiling side plate 34 folded in two is separated, the interior portion 70 including the barrier layer 72b at the upper end of the open end 31k of the ceiling back plate 31 is pulled by the ceiling side plate 34. Therefore, the peeled portion PL between the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b can be reliably formed.

When the length L2 in the left-right direction of the folded portion 35a (back side portion) of the glue allowance piece 35 is shorter than the length L1 in the left-right direction of the base portion 35b (front side portion) of the glue allowance piece 35, the glue allowance piece 35 The open end of the folded-back portion 35a of 35 is arranged inside the open end 31k of the ceiling back plate 31 (on the side surface plate 32 side of the ceiling). As a result, peeling between the interior portion 70 and the exterior portion 60 is less likely to occur at the open end of the folded back portion 35a of the adhesive margin piece 35, and the barrier layer 72b at the upper end of the open end 31k of the ceiling back plate 31 is included. The interior portion 70 is pulled by the ceiling front plate 33 and the adhesive margin piece 35 and is more easily peeled from the exterior portion 60 including the paper base material layer 62.

After the heat-bonding layer peeling process, the heat-bonding portions 39 to 42 are bonded, and the inner portion 70 including the barrier layer 72b and the outer portion 60 including the paper base material layer 62 are peeled and cut from the peeled portion PL. Since the barrier layer peeling step of cutting the paper base layer 62 on the line 51 is provided, the liquid container 1 can be easily disassembled.

In addition, you may provide the process (2nd peeling process) which peels off the heat-bonding parts 39-42 after a heat-bonding layer peeling process, and may perform a barrier layer peeling process, after opening the upper surface of the sloping roof part 30. When the barrier layer peeling process is performed in a state where the heat-bonding portions 39 to 42 are bonded, the liquid storage container 1 from which the body portion 10 and the exterior portion 60 of the sloping roof portion 30 are peeled off is sealed by attaching the cap 3a. It This is more desirable because it is possible to discard the liquid storage container 1 from which the exterior part 60 has been peeled off without cleaning the inside of the liquid storage container 1.

Further, since the peeled portion PL is generated during the disassembling operation of the liquid storage container 1, it is possible to prevent the appearance of the liquid storage container 1 from being deteriorated.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. 11 and 12 show a perspective view of the liquid storage container of the second embodiment as seen from the front side and a perspective view as seen from the back side, respectively. FIG. 13 is a cross-sectional view showing the layer structure of the blank plate 100 of the liquid storage container 1. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 10 are given the same reference numerals. The present embodiment differs from the first embodiment in that a cutting line 51 (first cutting portion) is also provided on the upper end portion of the body portion 10 of the liquid storage container 1. The layer structure of the blank plate 100 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

An annular cutting line 51 (first cutting portion) that extends in a substantially horizontal direction is provided on the outer surface side of the barrier layer 72b on the bottom side and the upper end of the body section 10. The distance between the upper cutting line 51 and the folding line 90 at the upper end of the body portion 10 is 50 mm or less. This makes it possible to increase the amount of paper that is peeled off and recycled on the upper and lower cutting lines 51. It is more desirable that the distance between the upper cutting line 51 and the folding line 90 at the upper end of the body portion 10 is formed to be 10 mm or more and 40 mm or less. As a result, buckling of the body portion 10 can be prevented when the liquid container 1 is molded.

The blank board 100 of the present embodiment omits the release layer 71 from the blank board 100 of the first embodiment, and also omits the anchor coating agent 65 between the outer surface adhesive layer 61 and the paper base material layer 62. Further, instead of the anchor coating agent 65 between the paper base material layer 62 and the interlayer adhesive layer 63, an adhesion adjusting layer 66 (release layer) is provided.

The adhesion strength between the adhesion adjusting layer 66 and the paper base material layer 62 is smaller than the adhesion strength between the respective heat adhesion layers of the blank plate 100. As the adhesion adjusting layer 66, for example, any one of acrylic acid-alkyl acrylate-alkyl methacrylate copolymer, styrene-acrylic acid copolymer, and acrylic acid-alkyl acrylate-alkyl methacrylate-styrene copolymer is used. A dissolved acrylic water-soluble resin or emulsion may be used. As a result, the blank plate 100 can be separated between the paper base material layer 62 and the adhesion adjusting layer 66. Others are the same as the layer structure of the blank board 100 of the first embodiment.

In this embodiment, the peel strength of the adhesion adjusting layer 66 is 0.05 N/15 mm width or more and less than 1 N/15 mm width. The peel strength was measured by a method of peeling the blank plate 100 having a width of 15 mm at 180° with respect to the peel surface, and the pulling speed was 300 mm/min.

The adhesion adjusting layer 66 may be arranged on the paper base layer 62 after the cutting line 51 is formed on the paper base layer 62, or the cutting line may be formed after the adhesion adjusting layer 66 is arranged on the paper base layer 62. 51 may be formed.

In the disassembling operation of the liquid container 1 of the present embodiment, the barrier layer peeling step is performed without passing through the heat-bonding portion peeling step. In the barrier layer peeling step, the user holds the exterior portion 60 including the paper base material layer 62 with the notch 51a and applies a force along the upper and lower cutting lines 51. The exterior portion 60 between the upper and lower cutting lines 51 of the body portion 10 is separated from the interior portion 70 between the paper base material layer 62 and the adhesion adjusting layer 66. Then, when the exterior part 60 peeled off in the circumferential direction reaches the cutting line 52 (second cutting part), it is separated on the cutting line 52. Thereby, the amount of paper remaining between the upper and lower cutting lines 51 can be reduced. The upper part of the liquid container 1 including the sloping roof part 30 and the bottom part of the liquid container 1 including the bottom part 20 are discarded.

According to the present embodiment, the upper and lower cutting lines 51 (first cutting portions) are formed by half-cutting the paper base material layer 62 from the inner surface side. That is, the upper and lower cutting lines 51 are formed by a half cut formed on the inner surface side of the paper base material layer 62. As a result, the amount of paper remaining between the upper and lower cutting lines 51 can be reduced, and the recyclability of the liquid storage container 1 can be improved. Further, since the upper cutting line 51 is also formed by a half cut cut from the inner surface side of the paper base material layer 62, damage to the barrier layer 72b can be prevented, and the yield of the liquid storage container 1 can be improved. You can

In addition, in the second embodiment, a blank plate having the same layer configuration as the blank plate 100 of the first embodiment may be used.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. 14 and 15 respectively show a perspective view seen from the front side and a perspective view seen from the back side of the liquid storage container of the third embodiment. For convenience of explanation, the same parts as those of the first embodiment shown in FIGS. 1 to 10 are given the same reference numerals. This embodiment is different from the first embodiment in that a peeling start portion 31e is provided on the upper end portion of the ceiling back plate 31 of the sloping roof portion 30. Further, the present embodiment is different from the first embodiment in that a cutting line 53 (third cutting part) is provided below the cutting line 51 (first cutting part). Further, the present embodiment is different from the first embodiment in that the notch 51a is omitted. Other parts are the same as those in the first embodiment.

FIG. 16 shows a developed view of the liquid storage container 1. At the upper end of the ceiling back plate 31 of the sloping roof portion 30, a peeling start portion 31e including a notch is formed. 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 fold line 90 at the lower end of the thermal bonding portions 41, 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 end of the heat-bonding portions 41 and 42 to 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, it is possible to suppress deterioration of the aesthetic appearance of the liquid storage container 1.

The body portion 10 is provided with an annular cutting line 53 (third cutting portion) adjacent to the lower side of the cutting line 51 (first cutting portion) and extending in a substantially horizontal direction. FIG. 17 is a cross-sectional view showing the layer structure of the blank plate 100 of the liquid storage container 1. The cutting line 53 is provided on the outer surface side of the barrier layer 72b and is formed by a half cut cut from the outer surface of the blank plate 100. Thereby, the cutting line 53 is formed from the outer surface side of the blank plate 100 to a depth reaching at least the paper base material layer 62. The cutting line 53 is formed by a continuous half cut in a substantially horizontal direction. The cutting line 53 may be formed by a perforated half cut.

A distance H3 (see FIG. 16) between the cutting line 51 and the cutting line 53 is formed to be 2 mm to 10 mm. More preferably, the distance H3 is formed to be 3 mm to 7 mm. Further, the distance H1-H3 between the cutting line 53 and the folding line 90 at the lower end of the body portion 10 is formed to be 10 mm or more. As a result, it is possible to prevent the body portion 10 from buckling when the liquid container 1 is molded.

In addition, the annular cutting line 53 extending in the horizontal direction formed on the outer surface of the blank plate 100 may be divided while avoiding the folding line 90 (see FIG. 16) extending in the vertical direction. As a result, it is possible to prevent appearance defects such as wrinkles of the folding line 90 due to the intersection with the cutting line 53. Further, the cutting line 53 may be formed in a perforated shape to avoid the folding line 90.

Further, the lower end of the cutting line 52 is arranged on the cutting line 53 or below the cutting line 53. It should be noted that the cutting lines 51 and 53 do not have to be provided on the blank plate 100 on the paste margin piece 15 side of the cutting line 52.

FIG. 18 is a top cross-sectional view of the upper end portion of the sloping roof portion 30 and shows the paste margin piece 35 portion. The peeling start portion 31e provided on the ceiling back plate 31 faces the turn-back portion 35a of the adhesive margin piece 35, and the turn-back portion 35a is exposed via the peel-off start portion 31e.

Further, the inner end of the peeling start portion 31e in the horizontal direction is arranged on the folded portion 35a. As shown in the figure, the blank plate 100 (see FIG. 5) has three layers on the outer side of the folded portion 35a, and the blank plate 100 has four layers on the folded portion 35a. At the time of frame sealing forming the heat-bonded portion 38, it is difficult to apply sufficient pressure because the three-layer portion of the side end portion has a small thickness. 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 adhesive margin piece 35 is weak, and there is a fear that peeling may easily occur 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 when the frame is sealed, and a strong adhesive strength can be obtained between the protruding portion 31b and the folded-back portion 35a. Therefore, the peeling start portion 31e removes the side end of the protruding portion 31b outside the folding back portion 35a, and the horizontal inner end of the peeling start portion 31e is provided on the folding 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 bonded inside the peeling start portion 31e. Therefore, the inner portion 70 and the outer portion 60 (see FIG. 6) of the protruding portion 31b can be stably separated.

At this time, if the distance D1 between the horizontal inner end of the peeling start portion 31e and the horizontal inner end of the folded portion 35a is set to 0.5 mm or more, the protrusion 31b and the folded portion 35a are reliably bonded. be able to. It is more desirable to form the distance D1 to 2 mm to 8 mm.

The heat-bonding portion peeling step of the disassembling operation of the liquid container 1 is performed in the same manner as in the first embodiment. In the barrier layer peeling step, the folded back portion 35a of the glue strip 35 exposed from the peeling start portion 31e is gripped 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 portion 35a and the inner surface adhesive layer 74 of the ceiling back plate 31 are firmly bonded. Therefore, with the inner portion 70 of the ceiling back plate 31 fixed to the folded portion 35a, the outer portion 60 at the upper end of the ceiling back plate 31 and the inner portion 70 are separated by the release layer 71.

When the exterior portion 60 of the ceiling back plate 31 is pulled downward and peeled off, the exterior portion 60 of the back plate 11 is continuously peeled off and reaches the cutting line 51. As a result, the ceiling back plate 31 and the exterior part 60 of the back plate 11 are separated in the circumferential direction along the cutting line 51. At this time, the cutting line 51 is formed by half-cutting the paper base layer 62 from the inner surface side. Therefore, it is possible to prevent interlayer peeling in the paper base material layer 62 when peeling the exterior portion 60 pulled to the outer surface side. Therefore, it is possible to prevent the paper base material layer 62 from remaining above the cutting line 51.

Further, when the exterior part 60 pulled downward goes too far below the cutting line 51 and is peeled off, it is guided in the circumferential direction by the cutting line 53 cut from the outer surface side of the blank plate 100. At this time, even if delamination occurs in the paper base material layer 62, the delamination is regulated by the upper cutting line 51.

The sloping roof part 30 and the exterior part 60 of the body part 10 which are peeled off in the circumferential direction reach the cutting line 52 and are cut in the vertical direction. At this time, since the lower end of the cutting line 52 is arranged on the cutting line 53 or below the cutting line 53, it is possible to surely cut in the vertical direction. As a result, the sloping roof part 30 and the exterior part 60 of the body part 10 are separated, and the exterior part 60 including the paper base material layer 62 and the interior part 70 including the barrier layer 72b are separated.

As a result, the liquid container 1 is dismantled, and the exterior part 60 including the paper base material layer 62 provided on the sloping roof part 30 and the body part 10 is recycled. Further, the interior part 70 of the sloping roof part 30, the interior part 70 of the body part 10 and the bottom part 20 are discarded.

In this embodiment, the same effect as that of the first embodiment can be obtained.

Further, a 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). At this time, since the four-layer portion on the folded-back portion 35a has a large thickness, sufficient pressure can be applied when the frame is sealed, and a strong adhesive strength can be obtained between the protruding portion 31b and the folded-back portion 35a. Thereby, the space between the paper base material layer 62 of the ceiling back plate 31 and the barrier layer 72b can be more easily separated from the separation start portion 31e than in the first embodiment.

Further, a cutting line 53 (third cutting portion) adjacent to the lower side of the cutting line 51 is formed at a depth reaching at least the paper base material layer 62 from the outer surface side of the blank plate 100. As a result, the exterior portion 60 that has been peeled off too far below the cutting line 51 can be reliably guided in the circumferential direction by the cutting line 53.

Further, the peeling start portion 31e is formed by a notch reaching the side end surface of the ceiling back plate 31. At this time, since the four-layer portion on the folded-back portion 35a has a large thickness, sufficient pressure can be applied when the frame is sealed, and a strong adhesive strength can be obtained between the protruding portion 31b and the folded-back portion 35a. As a result, the folded-back portion 35a exposed from the peeling start portion 31e is gripped to easily peel off the exterior portion 60 including the paper base material layer 62 and the interior portion 70 including the barrier layer 72b at the upper end portion of the ceiling back plate 31. can do.

In the present embodiment, the peeling start portion 31e is formed by a notch that reaches the side end surface of the ceiling back plate 31, but it is formed by a notch or a notch such as an I notch or a V notch facing the folded portion 35a. May be. At this time, in the barrier layer peeling step, the outside of the peeling start portion 31e (on the side surface of the ceiling side plate 34) is gripped together with the folded-back portion 35a, and is separated from the inside of the peeling start portion 31e of the ceiling back plate 31. Thereby, 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 inner portion 70 inside the peeling start portion 31e is bonded to the folded-back portion 35a. Then, by inserting a finger between the peeled inner portion 70 and the outer portion 60 and pulling them apart, the outer portion 60 can be peeled from the inner portion 70.

<Fourth Embodiment>
FIG. 19 shows a development view of the blank plate 100 of the liquid storage container 1 of the fourth embodiment. The present embodiment is different from the first embodiment in that the ceiling back plate 31 and the ceiling front plate 33 are provided with opening start portions 31c and 33c and chamfers 31f and 33f. Further, the present embodiment is different from the first embodiment in that the notch 51a is omitted. Other parts are the same as those in the first embodiment.

The unsealing start portions 31c and 33c are provided at both ends of the protrusion 31b of the ceiling back plate 31 and both ends of the protrusion 33b of the ceiling front plate 33. The opening start portions 31c and 33c are formed by notches (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.

The unsealing start portions 31c and 33c are formed one or more in an area within 3 mm above the intersection P between the upper end surfaces 32d and 34d of the ceiling side surface plates 32 and 34 and the protruding portions 31b and 33b. It is more desirable to provide the opening start portions 31c and 33c on the intersection P. Further, the horizontal length of the opening start portions 31c and 33c is formed to be 5 mm or less. As a result, it is possible to prevent the aesthetic deterioration of the liquid storage container 1.

Chamfers 31f and 33f are provided at both upper ends of both sides of the protrusion 31b of the ceiling back plate 31 and both ends of the protrusion 33b of the ceiling front plate 33, respectively. Similarly, a chamfer 35f is provided on the upper end of one side end of the glue margin piece 35. One chamfer 33f is arranged facing the one chamfer 31f and the chamfer 35f, and the other chamfer 33f is arranged facing the other chamfer 31f. The chamfers 31f, 33f, and 35f reduce the adhesion area of the protruding portions 31b and 33b and the heat-bonding portion 38 of the adhesive margin piece 35, so that one end of the heat-bonding portion 38 can be easily peeled off.

The chamfers 31f, 33f, and 35f may be formed in a linear shape or a curved shape. The lower ends of the chamfers 31f, 33f, and 35f are formed within a range of 2 mm or less above the intersection P between the upper end surfaces 32d and 34d of the ceiling side surface plates 32 and 34 and the protruding portions 31b and 33b. As a result, the bonding area of one end of the heat bonding portion 38 can be surely reduced. It is more desirable to provide the lower ends of the chamfers 31f, 33f, 35f on the intersection point P.

The length L3 of the chamfers 31f, 33f, 35f in the horizontal direction is 3 mm or more and is formed to be ½ or less of the lateral width of the ceiling back plate 31 and the ceiling front plate 33. As a result, it is possible to surely reduce the bonding area of both end portions of the heat bonding portion 38. It is more desirable to form the length L3 to 5 mm to 20 mm.

In the heat-bonding portion peeling step of disassembling the liquid container 1 having the above-described configuration, the side end portion of the heat-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 is opened from below. It is possible to easily peel off up to 31c and 33c. Then, the protrusions 31b and 33b are separated from each other while the protrusions 33b and the inner surface adhesive layer 74 and the barrier base material layer 72a of the protrusions 31b are cut from the opening start portions 31c and 33c.

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

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the opening start portions 31c and 33c, which are notches or notches of the blank plate 100, are provided at both end portions of the protruding portions 31b and 33b, the thermal bonding portion 38 (second bonding portion) is formed in the thermal bonding portion peeling step. It can be easily torn off.

Further, since the opening start portions 31c and 33c are provided in the range of 3 mm above the intersection P, it is possible to easily peel off the opening start portions 31c and 33c from below. Further, 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 liquid storage container 1 from being deteriorated.

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

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

Further, since the chamfers 31f and 33f are provided on the one side ends of the protrusions 31b and 33b, the bonding area of one side end of the thermal bonding section 38 can be reduced to facilitate the one side end of the thermal bonding section 38. Can be peeled off.

Further, since the lower ends of the chamfers 31f, 33f, and 35f are formed in the range of 2 mm or less above the intersection P, the bonding area of the one side end of the heat bonding portion 38 can be surely reduced. Further, since the horizontal length L3 of the chamfers 31f, 33f, and 35f is 3 mm or more and is formed to be 1/2 or less of the lateral width of the ceiling back plate 31 and the ceiling front plate 33, the one end portion of the heat bonding portion 38 is The adhesion area can be surely reduced.

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

<Fifth Embodiment>
Next, FIG. 20 shows a development view of the blank plate 100 of the liquid storage container 1 of the fifth embodiment. The present embodiment is different from the first embodiment in the shape of the upper end surfaces 32d and 34d of the ceiling side surface plates 32 and 34, and is provided with opening assisting portions 32c and 34c. Further, the present embodiment is different from the first embodiment in that the notch 51a is omitted. Further, the opening start portions 31c and 33c similar to those in the fourth 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 that are linearly inclined from both ends toward the center, and is formed as a concave surface with both ends as the uppermost points. The upper end surface 34d of the ceiling side plate 34 has a pair of inclined portions 34e that are linearly inclined from both ends toward the center, and is formed as a concave surface having both ends as the uppermost points.

The distance F from the lower ends of the inclined portions 32e and 34e to the folding lines 90 at the lower ends of the thermal bonding portions 36 and 37 is set to 5 mm or more. Thereby, leakage of the contents can be prevented.

The protrusions 33b, 31b at the upper ends of the ceiling front plate 33 and the ceiling back plate 31 project above the uppermost points of the upper end faces 32d, 34d of the ceiling side plates 32, 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, and a horizontal portion may be provided between the pair of inclined portions 34e.

When the same device as that of the first embodiment is used when assembling the liquid storage container 1, the heat-bonding portion 38 pressurizes the same region as that of the first embodiment and is heat-bonded. Therefore, non-bonded portions 33d and 31d where the ceiling front plate 33 and the ceiling back 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 surface plates 32 and 34. As a result, the adhesion area of the adhesion portions 39 to 42 becomes smaller. Moreover, the bonding area of the heat-bonding portions 36 and 37 of the ceiling side plates 32 and 34 becomes narrow.

Further, the opening start portions 31c and 33c provided at both ends of the protrusion 31b and the protrusion 33b are arranged on the non-bonded portions 31d and 33d.

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

The vertical length of the unsealing aids 32c and 34c is formed to be 5 mm or less. As a result, it is possible to prevent the aesthetic deterioration of the liquid storage container 1.

In the heat-bonding portion peeling step of disassembling the liquid container 1 having the above-described configuration, the bonding areas of the heat-bonding portions 36, 37 are small because the upper end surfaces 32d, 34d of the ceiling side plates 32, 34 are concave. Further, the heat-bonding portions 36 and 37 are sequentially peeled off between the plurality of opening assisting portions 32c and 34c. Therefore, the heat-bonded portions 36 and 37 can be easily peeled off.

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

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, since the opening start portions 33c and 31c, which are cutouts or cutouts of the blank plate 100, are provided at both side ends of the protruding portions 33b and 31b, the thermal bonding portion 38 can be easily peeled off in the thermal bonding portion peeling step. it can.

Further, since the upper end surfaces 32d and 34d of the ceiling side plates 32 and 34 are formed as concave surfaces having both ends as the uppermost points, the thermal bonding portion 36 can be formed without increasing the bonding strength of the both ends of the thermal bonding portion 38. The adhesive strength of 37 can be reduced. Therefore, the heat-bonded portions 36 and 37 can be easily peeled off in the heat-bonded portion peeling step. The upper end surfaces 32d and 34d of the ceiling side surface plates 32 and 34 may be formed by horizontal surfaces.

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

In addition, since the plurality of unsealing aids 32c and 34c formed by notches or notches in the blank plate 100 are provided at the upper ends of the ceiling side plates 32 and 34, the heat-bonding portions 36 and 37 can be more easily formed in the heat-bonding portion peeling step. Can be peeled off.

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

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

<Sixth Embodiment>
Next, FIG. 21 shows a development view of the blank plate 100 of the liquid storage container 1 of the sixth embodiment. The present embodiment is different from the fifth embodiment in the structure of the unsealing start parts 33c, 31c and the unsealing aid parts 32c, 34c. Other parts are the same as in the fifth embodiment.

The unsealing start portions 31c and 33c are formed by a large number of dot-shaped pores 81 (see FIG. 22), and are provided in the rectangular regions at both ends of the protrusion 33b and the protrusion 31b. The lower ends of the opening start portions 31c and 33c are formed on the intersection points P between the upper end surfaces 32d and 34d of the ceiling side surface plates 32 and 34 and the protruding portions 31b and 33b. The lower ends of the unsealing start portions 31c and 33c may be formed on the boundary line between the ceiling back plate 31 and the back plate 11 and on the boundary line between the ceiling front plate 33 and the front plate 13.

Similarly, the unsealing aids 32c and 34c are formed by a large number of dot-shaped pores 81 (see FIG. 22), and are provided in the rectangular regions on both side ends of the ceiling side plates 32 and 34. The lower ends of the unsealing aids 32c and 34c may be formed on the boundary line between the ceiling back plate 31 and the back plate 11 and on the boundary line between the ceiling front plate 33 and the front plate 13.

FIG. 22 is a cross-sectional view showing the layer structure of the blank plate 100 on the opening start part 33c. On the inner surface of the blank plate 100, the pores 81 forming the dots of the opening start portion 33c are engraved by a roller having a large number of needles. The pores 81 reach from the inner surface of the blank plate 100 to the middle of the paper base material layer 62 and penetrate the inner surface adhesive layer 74 and the barrier base material layer 72a. The dot-shaped pores of the unsealing start portion 31c and the unsealing aid portions 32c and 34c are also formed in the same manner.

Similar to the fifth embodiment, the opening start portions 33c and 31c composed of the plurality of pores 81 can easily peel off the thermal bonding portion 38 in the thermal bonding portion peeling step.

In addition, the unsealing aids 32c and 34c composed of the plurality of pores 81 can easily peel off the heat-bonded portions 36 and 37 (first bond portions) in the heat-bonded portion peeling step.

The pores 81 may penetrate the blank plate 100. Further, a large number of pores 81 may be provided in a continuous strip shape at the upper ends of the ceiling front plate 33, the ceiling back plate 31, and the ceiling side plates 32, 34. Accordingly, the opening start portions 33c, 31c and the opening assistance portions 32c, 34c can be easily formed when the blank plate 100 is formed. At this time, the strip-shaped pores 81 may be arranged on the entire surface above the folding line 90 at the lower ends of the heat-bonding portions 39 to 42. Further, the lower ends of the band-shaped pores 81 may be arranged above the folding lines 90 at the lower ends of the heat-bonding portions 39 to 42 at a predetermined interval. As a result, the lower ends of the heat-bonding portions 39 to 42 facing the inside of the paper container 1 become regions in which the pores 81 are not formed, and it is possible to prevent deterioration of the hermeticity of the paper container 1.

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

In addition, in 3rd Embodiment-6th Embodiment, you may use the blank board which has the same layer structure as the layer structure of the blank board 100 of 2nd Embodiment.

Further, in the third embodiment to the sixth embodiment, a notch 51a continuous with the cutting disconnection 51 may be provided at the edge of the back plate 11 overlapping the glue strip 15.

INDUSTRIAL APPLICABILITY According to the present invention, it can be used for a liquid storage container that stores a liquid content.

1 Liquid Storage Container 2 Main Body 3 Spouting Member 10 Body 11 Back Plate (Peripheral Plate)
12, 14 Side plate (peripheral plate)
13 Front plate (peripheral plate)
15, 25, 35 Adhesive pieces 15a, 25a, 35a Folding part 20 Bottom part 21-24 Bottom plate 30 Sloped roof part (top part)
31 Ceiling back plate (back part)
31b, 33b Projection parts 31c, 33c Unsealing start part 31d, 33d Non-adhesive part 31e Peeling start part 32, 34 Ceiling side plate (side part)
32c, 34c Opening assisting parts 32d, 34d Upper end face 33 Ceiling front plate (front part)
33a Insertion hole 36, 37 Thermal bonding part (first bonding part)
38 Heat-bonded part (second bonded part)
39, 40 Heat bonded part (third bonded part)
41, 42 Heat bonded part (4th bonded part)
51 Cutting line (first cutting part)
51a Notch 52 Cutting line (second cutting portion)
53 Cutting line (3rd cutting part)
60 Exterior Part 61 External Adhesive Layer 62 Paper Base Material Layer 63 Interlayer Adhesive Layer 65 Anchor Coating Agent 66 Adhesion Control Layer (Release Layer)
68 Printing layer 69 Release agent 70 Interior part 71, 64 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 79 Release layer 81 Pore 90 Fold line 100 Blank board

Claims (1)

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 a gas barrier property on one surface, and an inner adhesive layer having thermoplasticity are laminated, A blank plate in which a release layer is provided between the base material layer and the barrier layer to enable the two layers to be separated from each other, and a plurality of peripheral plates continuously provided in the circumferential direction and one peripheral plate bonded to the peripheral plate 1 A bell-top type liquid storage having a tubular body having a rectangular cross section having a glue strip, a sloping roof portion that closes the top surface of the body portion, and a bottom surface portion that closes the bottom surface of the body portion. In the method of disassembling the container,
The sloping roof portion includes a ceiling front plate and a ceiling rear plate that are inclined and opposed to each other in the front-rear direction, a pair of left and right ceiling side plates that connect the ceiling front plate and the ceiling rear plate, and one of the ceiling side plates. A second adhesive strip that is continuously provided and adhered to the ceiling back plate, a first adhesive portion in which the upper end portion of the ceiling side plate is folded in two and adhered by the outer surface adhesive layer, and A second adhesive portion, which is formed by adhering a pair of protruding portions protruding upward and respectively provided on the ceiling front plate and the ceiling rear plate to each other by the inner surface adhesive layer, and an upper end portion of the ceiling side plate and the ceiling front plate. A third adhesive portion adhered to each other by an inner surface adhesive layer, a fourth adhesive portion in which upper ends of the ceiling side surface plate and the ceiling rear surface plate are adhered to each other by the inner surface adhesive layer, and the second adhesive margin piece in the circumferential direction. A first half portion having a folded portion that is folded back and adhered to the ceiling back plate, and an annular half cut that extends in a substantially horizontal direction and that cuts at least the paper base material layer from the inner surface side on the outer surface side with respect to the barrier layer; A cutting part is provided at the bottom of the body,
The fixing strength between the ceiling back plate and the second adhesive margin piece is higher than the fixing strength between the paper base layer and the barrier layer,
A first peeling step of peeling off the first adhesive portion and the second adhesive portion by applying a force in a direction in which the ceiling front plate and the ceiling rear plate are separated from each other;
With the third adhesive portion and the fourth adhesive portion adhered, the barrier layer and the paper base material layer are placed on the release layer from an open end of the ceiling back plate that faces the second adhesive margin piece. A barrier layer peeling step of peeling the paper base material layer and cutting the paper base material layer on the first cutting portion,
A dismantling method comprising:

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