JP2022186287A - Insulation structure, method of forming insulation structure, and paper container - Google Patents

Abstract

To provide an insulation structure that solves such a problem as the heights of multiple concaves and convexes decrease, thereby lowering the insulation property and ornamental property.SOLUTION: An insulation structure 10A has an insulation part 2 that is embossed so as to form directly or indirectly multiple concaves and convexes 20 on a paper cup body 11 as a paper container body. The insulation part 2 has at least one of the front surface and the back surface of a blank sheet 3 as a base paper coated with aqueous coating material and has a coating layer 4A formed by the dried aqueous coating material and multiple cracks 5 on the coating layer 4A.SELECTED DRAWING: Figure 1

Description

The present invention provides a heat insulating structure in which a paper container body is directly or indirectly provided with an embossed heat insulating portion forming a plurality of irregularities, a method for forming this heat insulating structure, and a paper container provided with this heat insulating structure. Regarding.

2. Description of the Related Art Conventionally, there has been known a paper container having heat insulating properties by means of a heat insulating structure in which a paper container body is directly or indirectly provided with an embossed heat insulating portion forming a plurality of irregularities.

For example, as an example of a heat insulating structure in which a paper container body is indirectly provided with a heat insulating part, Patent Document 1 discloses that embossing is applied along the outer periphery of the body of the paper container body to form a large number of irregularities. A paper cup is disclosed as a paper container wrapped with an outer heat-insulating sleeve so as to have heat-insulating properties.

In this type of paper container, for the purpose of heat-sealing type adhesion, further improving heat insulating properties, giving a high-class feeling due to the good appearance such as gloss, and increasing the product value, the heat insulating part of the paper container body is used. In many cases, either the front surface or the back surface of the film is covered with a film made of resin, for example, by lamination.

However, if lamination is performed to cover either the surface or the back of the heat insulating part of the paper container body with a film made of resin, etc., the coated film tends to return to the shape before the heat insulating part was embossed. It is considered that a restoring force works. For this reason, the inventors independently found that there is a problem that the embossed height of a plurality of unevenness formed by embossing on the heat insulating portion is lowered, and the heat insulating properties, design properties, etc. are deteriorated.

JP 2016-000623 A

Therefore, the present invention has been devised in view of the above-described problems, and the object thereof is to reduce the embossed height of a plurality of unevenness, thereby reducing heat insulation, design, etc. To provide a heat insulating structure, a method for forming the heat insulating structure, and a paper container provided with the heat insulating structure, which can improve the problem of storing the paper.

In order to solve the above-mentioned problems, the present inventors have proposed a heat insulating structure in which a paper container body is directly or indirectly provided with an embossed heat insulating portion that forms a plurality of unevenness, wherein the heat insulating portion is a heat insulating structure comprising a coating layer formed by drying the water-based coating agent applied to at least one of the front surface or the back surface of the base paper, and having a plurality of cracks in the coating layer. invented.

A heat insulating structure according to a first aspect of the present invention is a heat insulating structure in which a paper container body is directly or indirectly provided with an embossed heat insulating portion that forms a plurality of unevenness, wherein the heat insulating portion is the surface of the base paper. Alternatively, a water-based coating agent is applied to at least one of the back surfaces, and a coating layer formed by drying the water-based coating agent is provided, and the coating layer has a plurality of cracks.

A heat insulating structure according to a second invention is characterized in that, in the first invention, the base paper is a blank sheet whose main material is paper.

A heat insulating structure according to a third invention is characterized in that, in the first invention or the second invention, the plurality of unevennesses formed by the embossing are continuous vertically and horizontally.

A heat insulating structure according to a fourth invention is characterized in that, in any one of the first to third inventions, the thickness of the coat layer is 5 to 20 μm.

A heat insulating structure according to a fifth invention is the heat insulation structure according to any one of the first invention to the fourth invention, in which the area ratio of the cracks in the coat layer exceeds 0.2% per unit area (wherein the unit area is 1 mm ² ).

A heat insulating structure according to a sixth invention is the heat insulating structure according to any one of the first to fourth inventions, wherein the area ratio of the cracks in the coat layer is 0.9% or more per unit area (where the unit area is 1 mm ² ).

A heat insulating structure according to a seventh invention is the heat insulating structure according to any one of the first to sixth inventions, wherein the area ratio of the cracks in the coat layer is 11.8% or less per unit area (where the unit area is 1 mm ² ).

A method for forming a heat insulating structure according to an eighth invention is a method for forming a heat insulating structure according to any one of the first to seventh inventions, wherein the water-based coating agent is applied to the front surface or the back surface of the base paper, the above Before the coating layer dries, the next coating layer is applied, and after the coat layer is formed by drying the whole of the plurality of coating layers, the base paper on which the coat layer is formed is subjected to the embossing. It is characterized by

A paper container according to a ninth aspect of the invention is characterized by comprising the heat insulation structure according to any one of the first to seventh aspects of the invention.

A heat insulating sheet according to a tenth invention is characterized in that the heat insulating structure according to any one of the first to seventh inventions is provided on the heat insulating sheet covering the outer surface of the paper container body.

A heat insulating sheet according to an eleventh invention is a heat insulating sheet according to the tenth invention, wherein the paper container main body is a paper cup main body, and the heat insulating sheet is a heat insulating outer wrapped around the outer periphery of the body of the paper cup main body. It is characterized by being a sleeve.

A paper cup according to a twelfth aspect of the invention is characterized by comprising the heat insulating sheet according to the eleventh aspect of the invention.

A paper cup according to a thirteenth aspect of the invention is the paper container according to the ninth aspect of the invention, wherein the paper container body is a paper cup body, has the heat insulation part on the body, and has the coating layer on the surface thereof. It is characterized by

According to the present invention having the above-described structure, the heat insulating portion, which is embossed to directly or indirectly form a plurality of irregularities on the paper container body, is coated with a water-based coating on at least one of the front surface and the back surface of the base paper. The coating layer formed by applying the agent and drying the water-based coating agent has a plurality of cracks. As a result of experimental verification, it was found that the embossed height of multiple unevenness can be ensured to the same extent as when embossed on base paper that has not been laminated. As a result, it is possible to solve the problem that the embossed height of the plurality of unevenness is lowered, and the heat insulating property, the design property, etc. are lowered.

FIG. 1(a) is a partially broken side view of a paper cup as a paper container according to Embodiment 1 of the present invention, and FIG. 1(b) is a heat insulating paper cup of FIG. 1(a). FIG. 3 is a partial enlarged view showing a partially enlarged rear surface of a heat-insulating outer sleeve as a sheet for heat insulation; FIGS. 2(a) to 2(d) are explanatory diagrams showing step by step the formation of the coat layer in the method for forming a heat insulating structure according to the first embodiment of the present invention. 3(a) is a side view showing a paper cup as a paper container according to Embodiment 2 of the present invention, and FIG. 3(b) is a body portion of the paper cup main body in the paper cup of FIG. 3(a). 1 is a partial enlarged view showing a partially enlarged surface of the . FIG. 4 is a schematic diagram showing samples used in experimental verifications 1 and 2. FIG. FIG. 5 is a table showing the results of experimental verification 1. FIG. FIG. 6 is a table showing the results of experimental verification 2. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments exemplified by applying the present invention will be described below with reference to the drawings.

[Embodiment 1]
First, a paper cup 1A as a paper container according to Embodiment 1 of the present invention will be described with reference to FIGS. 1(a) and 1(b). FIG. 1(a) is a side view showing a partially broken paper cup 1A as a paper container according to Embodiment 1 of the present invention, and FIG. 1(b) is the paper cup 1A of FIG. 1(a). 2 is a partial enlarged view showing a partially enlarged rear surface of a heat insulating outer sleeve 3 as a heat insulating sheet in FIG.

As shown in FIG. 1(a), a paper cup 1A as a paper container according to Embodiment 1 of the present invention includes a paper cup main body 11 as a paper container main body, and a paper cup main body 11 along the outer periphery of the body portion 11a of the paper cup main body 11. and a heat insulating outer sleeve 3 as a heat insulating sheet that is wrapped around.

The paper cup main body 11 is composed of a bottomed cylindrical body portion 11a having a curled portion 11b at its upper edge.

As shown in FIGS. 1(a) and 1(b), the heat-insulating outer sleeve 3 comprises a blank sheet 3A mainly made of paper as a base paper, and a water-based coating agent applied to the back surface of the blank sheet 3A. and a coat layer 4A formed by drying the water-based coating agent.

In addition, substantially the entire surface of the heat-insulating outer sleeve 3 is provided with a heat-insulating structure 10A having a heat-insulating portion 2 in which a plurality of unevennesses 20 composed of concave portions 21 and convex portions 22 formed by embossing are continuously arranged in a lattice shape vertically and horizontally. It is

In addition, the plurality of unevennesses 20 formed by embossing in the heat insulating structure 10A are not limited to a shape that continues vertically and horizontally in a lattice shape, and may be implemented in other shapes such as a shape that continues in a horizontal stripe shape or a vertical stripe shape. You may

The coat layer 4A forming the heat insulating structure 10A has a plurality of cracks 5 as shown in FIG. 1(b).

The heat-insulating outer sleeve 3 is wound along the outer periphery of the body portion 11a of the paper cup body 11, and is attached by bonding by heating the coat layer 4A as a heat seal.

Here, the thickness of the coat layer 4A is at least 5 μm in consideration of the heat sealability for the purpose of heat seal type adhesion by the coat layer 4A. Although it has been found to be preferable, other ranges may be implemented.

Further, as shown in the results of Experimental Verification 1 described later, the area ratio of the plurality of cracks 5 in the coat layer 4A exceeds 0.2% per unit area (where the unit area is 1 mm ² and ) is preferred.

Furthermore, as shown in the results of Experimental Verification 1 described later, the area ratio of the plurality of cracks 5 in the coat layer 4A is 0.9% or more per unit area (here, the unit area is 1 mm ^2. ) is more preferable.

In addition, as shown by the results of Experimental Verification 2 described later, the area ratio of the plurality of cracks 5 in the coat layer 4A exceeds 11.8% per unit area (here, the unit area is 1 mm ² ), the surface of the coat layer 4A floats, and in some cases the quality such as appearance is somewhat inferior. Therefore, the area ratio occupied by the plurality of cracks 5 is preferably 11.8% or less per unit area (here, the unit area is 1 mm ² ).

However, in particular, unlike the second embodiment described later, which aims to increase the commercial value by further increasing the heat insulation property, giving a high-class feeling due to the good appearance such as gloss, and for the purpose of heat seal type adhesion, the coat Since the layer 4A is hidden inside the blank sheet 3A, the area ratio of the plurality of cracks 5 in the coat layer 4A may exceed 11.8% per unit area.

Next, a method for forming the heat insulating structure 10A according to Embodiment 1 of the present invention will be described.

First, as shown in FIG. 2(a), a water-based coating agent is applied to the back surface of the blank sheet 3A, and the first coating layer 41 is applied.

Subsequently, as shown in FIG. 2B, before the first coating layer 41 dries, a water-based coating agent is applied, and the second coating layer 42 is overcoated.

Subsequently, as shown in FIG. 2C, before the second coating layer 42 dries, a water-based coating agent is applied, and a third coating layer 43 is overcoated.

Then, as shown in FIG. 2(d), before the third coating layer 43 dries, a water-based coating agent is applied, and a fourth coating layer is overcoated. , 44 are dried to form the coating layer 4A. Incidentally, the coat layer 4A may be formed in a single coating layer by applying the water-based coating agent only once to obtain the required thickness.

After that, the blank sheet 3A having the coat layer 4A formed on the back surface is embossed using an embossing machine at a temperature below the glass transition temperature of the resin that is the main component of the water-based coating agent used to form the coat layer 4A. When processed, the heat insulating structure 10A is formed.

It should be noted that the cracks 5 do not always have to be present at the stage of forming the coat layer 4A, and may be present after embossing.

In addition, the surface of the blank sheet 3A may also be provided with a coat layer 4A for the purpose of further improving heat insulation, giving a high-class feeling due to a good appearance such as gloss, and increasing commercial value ( For details, refer to Embodiment 2 described later.).

Examples of the resin having a relatively high glass transition temperature, which is the main component of the water-based coating agent used to form the coating layer 4A, include polyolefin resin, polypropylene resin, polyethylene resin, modified polypropylene resin, and modified polyethylene resin. , polyethyleneimine resin, ethylene vinyl acetate copolymer resin, polyolefin ionomer resin, ethylene acrylic acid copolymer resin, ethylene methacrylic acid copolymer resin, ethylene methyl methacrylate copolymer resin, ethylene vinyl chloride copolymer resin, ethylene methyl acrylate copolymer resin Polymeric resin, polyvinyl alcohol resin, acrylic acid resin, acrylic acid copolymer resin, styrene acrylic acid copolymer resin, methacrylic acid resin, polymethyl methacrylate resin, methacrylic acid copolymer resin, vinyl chloride resin, polyvinylidene chloride resin, acetic acid Vinyl resin, polyurethane resin, polyester resin, polyethylene terephthalate resin, polylactic acid resin, polyhydroxyalkanoic acid resin, polybutylene succinate resin, polyamide resin, copolymer nylon resin, polystyrene resin, styrene-maleic acid copolymer resin, phenolic resin, Rosin-modified phenolic resin and the like.

In addition, for example, in consideration of the environment, a biodegradable resin or the like may be used as the main component of the aqueous coating agent used to form the coat layer 4A.

According to the first embodiment of the present invention described above, the heat insulating portion 2, which is indirectly embossed to form a plurality of irregularities 20 on the paper cup main body 11 as the paper container main body, is replaced by the blank sheet 3A as the base paper. A water-based coating agent is applied to the rear surface of the substrate, and the coating layer 4A formed by drying the water-based coating agent has a plurality of cracks 5. - 特許庁As a result of the experimental verification described later, the embossed height of the plurality of unevennesses 20 (the length between the outer surface of the recessed portion 21 and the outer surface of the raised portion 22) was determined as a blank as a base paper without lamination. It was found that the same degree of embossing can be ensured as in the case where the sheet 3A is embossed. As a result, the embossing height of the plurality of unevennesses 20 becomes low, and the problem that the heat insulating property, the design property, etc. are deteriorated can be improved.

Moreover, in Embodiment 1 of the present invention, the coating layer 4A is used for heat-sealing adhesion, which is superior to cold-crew adhesion. There are also merits such as reduction.

It was also confirmed that the method of forming the heat insulating structure 10A according to Embodiment 1 of the present invention can easily form a plurality of cracks 5 in the coat layer 4A on the back surface of the blank sheet 3A. Moreover, since the next coating layer can be overcoated before the previous coating layer dries, the coat layer 4A can be formed in a short time, which is efficient.

[Embodiment 2]
Next, a paper cup 1B as a paper container according to Embodiment 2 of the present invention will be described with reference to FIGS. 3(a) and 3(b). FIG. 3(a) is a side view showing a paper cup 1B as a paper container according to Embodiment 2 of the present invention, and FIG. 3(b) is a paper cup main body 11 in the paper cup 1B of FIG. 3(a). is a partially enlarged view showing a partially enlarged surface of the body portion 11a of the .

A paper cup 1B as a paper container according to Embodiment 2 of the present invention differs from a paper cup 1A as a paper container according to Embodiment 1 above mainly in that an outer sleeve 3 for heat insulation as a heat insulation sheet The paper cup main body 11 as a paper container main body is provided with an embossed heat insulating portion 2 that forms a plurality of unevenness 20 directly without having a The same reference numerals are assigned to the configurations, and the description thereof is omitted.

In this paper cup 1A, as shown in FIGS. 3(a) and 3(b), a water-based coating agent is applied to the surface of a blank sheet 11A as a base paper that constitutes the body portion 11a of the paper cup body 11. A coat layer 4B is formed by drying the water-based coating agent.

Almost the entire surface of the blank sheet 11A excluding the curled portion 11b is provided with a heat insulating portion 2 in which a plurality of concave portions 21 and convex portions 22 formed by embossing are continuously arranged in a lattice shape. The structure 10B is different from the paper cup 1A as the paper container according to the first embodiment.

In the paper cup 1B as the paper container according to the second embodiment, unlike the paper cup 1A as the paper container according to the first embodiment, the coat layer 4B is further improved in heat insulation and has a good appearance such as gloss. It is formed for the purpose of increasing the product value by giving it a sense of luxury.

Moreover, in order to further increase the commercial value, it is possible to provide a printed layer between the blank sheet 11A and the substantially transparent coat layer 4B.

[Example 1]
The results of Experimental Verification 1 conducted to confirm the effects of the present invention will be described below.

In this experimental verification 1, the sample S of Comparative Example 1, Comparative Example 2, Inventive Example 1, and Inventive Example 2 all used a blank sheet 3A as fan-shaped base paper with a thickness of 0.239 mm. (see Figure 4).

In Sample S of Comparative Example 1, one side of the blank sheet 3A was extrusion laminated to a thickness of 10 μm.

In the sample S of Comparative Example 2, the blank sheet 3A was left as it was without lamination or the like.

In the sample S of Inventive Example 1, the coating layer 4A without cracks 5 was formed on one side of the blank sheet 3A before embossing to a thickness of 10 μm.

In the sample S of Inventive Example 2, the coat layer 4A having the cracks 5 was formed on one side of the blank sheet 3A even before embossing to a thickness of 10 μm.

In addition, in the samples S of Comparative Examples 1, 2, Inventive Example 1, and Inventive Example 2, the bottom side of the blank sheet 3A is higher than the top side of the blank sheet 3A (corresponding to the upper side of the paper cup 1A). The side (corresponding to the lower side of the paper cup 1A) was embossed so that the embossed height was lower.

Here, in the sample S of Inventive Example 1, the area ratio of the plurality of cracks 5 in the coat layer 4A is 0.21% per unit area (here, the unit area is 1 mm ² ). ).

Further, in the sample S of Inventive Example 2, the area ratio of the plurality of cracks 5 in the coat layer 4A is 0.9% per unit area (here, the unit area is 1 mm ² ). .

Three measurement points P1 on the left, right, and middle of the top side and bottom side of the blank sheet 3A in the sample S of Comparative Example 1, Comparative Example 2, Inventive Example 1, and Inventive Example 2 configured in this way , P2 were measured, and the average value of each was calculated.

After that, the average value of the sample S of Comparative Example 1 was subtracted from the average value of the sample S of Comparative Example 2, Inventive Example 1, and Inventive Example 2, and compared with each other. As a result, the test results shown in FIG. 4 were obtained. .

The emboss height was measured using a Mitutoyo measuring instrument (trade name: digital height gauge), a disc having a diameter of 25 mm and a weight of 39.5 g was placed, and the height was set to zero. Then, the samples S of Comparative Example 1, Comparative Example 2, Inventive Example 1, and Inventive Example 2 were laid under the disk, and the height was measured, and this height was defined as the embossing height.

Further, the water-based coating agent forming the coating layer 4A of the sample S of the present invention examples 1 and 2 contains ionomer (ethylene methacrylic acid copolymer) as a main component resin and has a solid content concentration of 35%. A water-based coating agent (trade name: Chemipearl S300) manufactured by Mitsui Chemicals, Inc. to which 5% of a diluting solvent (isopropyl alcohol) was added was used.

From the test results shown in FIG. 5, since Sample S of Comparative Example 1 was subjected to extrusion lamination, the resin component of the laminate layer was in the elastic region even after embossing, and the restoring force worked. It is considered that the embossing height becomes low.

Sample S of Comparative Example 2 was confirmed to have an ideal embossing height because it was simply embossed on the blank sheet 3A as a base paper that was not laminated or the like.

On the other hand, it was found that the samples S of Inventive Examples 1 and 2 can ensure the same emboss height as the sample S of Comparative Example 2, which is ideal. It is believed that this is because the resin component of the coat layer 4A is in the plastic region, and the embossed height is maintained by the occurrence of a plurality of cracks 5. FIG.

Further, by comparing Sample S of Inventive Example 1 and Inventive Example 2, the area ratio of the plurality of cracks 5 in the coat layer 4A exceeds 0.2% per unit area (here, the unit area is 1 mm ² ). Furthermore, in the coat layer 4A, the area ratio of the plurality of cracks 5 is more preferably 0.9% or more per unit area (here, the unit area is 1 mm ² ). .

The reason for this is considered to be that the larger the area ratio of the cracks 5 in the coat layer 4A, the easier the plastic deformation and the more the embossed height is maintained.

[Example 2]
The results of Experimental Verification 2 conducted to confirm the effects of the present invention will be described below.

In this experimental verification 2, in the same way as in the above experimental verification 1, the sample S of Comparative Example 3 and Inventive Example 3 both used a blank sheet 3A as fan-shaped base paper with a thickness of 0.239 mm. (See Figure 4).

In both Comparative Example 3 and Sample S of Inventive Example 3, a coat layer 4A having cracks 5 was formed even before embossing with a thickness of 10 μm was applied to one side of the blank sheet 3A.

In both Comparative Example 3 and Sample S of Inventive Example 3, the bottom side of the blank sheet 3A (corresponding to the lower side of the paper cup 1A) is closer to the top side of the blank sheet 3A (corresponding to the upper side of the paper cup 1A). ) was embossed so that the embossed height was lower.

Here, in the sample S of Comparative Example 3, the area ratio of the plurality of cracks 5 in the coat layer 4A is 11.84% per unit area (here, the unit area is 1 mm ² ). .

Further, in the sample S of Inventive Example 3, the area ratio of the plurality of cracks 5 in the coat layer 4A is 11.8% per unit area (here, the unit area is 1 mm ² ). .

Five samples S of Comparative Example 3 and Inventive Example 3 each having such a structure were prepared, and it was confirmed whether or not there was a case where the surface of the coat layer 4A was floating.

The test results are shown in FIG. 6. In Comparative Example 3, the surface of the coat layer 4A of two of the five samples S was lifted.

In contrast, none of the five samples S of Inventive Example 3 caused the surface of the coat layer 4A of the sample S to float.

From this test result, in the coating layer 4A, the area ratio occupied by the plurality of cracks 5 exceeds 11.8% per unit area (here, the unit area is 1 mm ² ). The surface of 4A floats, and the quality such as the appearance is slightly inferior. It has been confirmed that it is disadvantageous to those formed for the purpose of increasing the commercial value by giving a high-class feeling due to the good appearance such as gloss.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

In the above-described embodiments, the present invention is applied only to the paper cups 1A and 1B, but is not limited to this, and may be applied to other paper containers such as paper containers for foods and medicines. .

10A, 10B Thermal insulation structure 1A, 1B Paper cup (paper container)
11 paper cup body (paper container body)
11a Body portion 11b Curl portion 11A Blank sheet (base paper)
2 Thermal insulation part 20 Concave and convex portion 21 Concave portion 22 Convex portion 3 Thermal insulation outer sleeve (heat insulation sheet)
3A blank sheet (base paper)
4A, 4B coat layers 41, 42, 43, 44 coating layer 5 cracks

Claims (13)

A heat insulating structure in which a paper container body is directly or indirectly provided with an embossed heat insulating part that forms a plurality of unevenness,
The adiabatic portion comprises a coating layer formed by applying a water-based coating agent to at least one of the front surface and the back surface of the base paper and drying the water-based coating agent,
A heat insulating structure, wherein the coat layer has a plurality of cracks. The heat insulating structure according to claim 1, wherein the base paper is a blank sheet whose main material is paper. The heat insulation structure according to claim 1 or 2, wherein the plurality of unevennesses formed by the embossing are continuous vertically and horizontally. The heat insulating structure according to any one of claims 1 to 3, wherein the coating layer has a thickness of 5 to 20 µm. Any one of claims 1 to 4, wherein the area ratio of the cracks in the coat layer exceeds 0.2% per unit area (here, the unit area is 1 mm ² ). 1. The heat insulating structure according to 1. Among claims 1 to 4, wherein in the coat layer, an area ratio of the cracks occupied by the cracks is 0.9% or more per unit area (here, the unit area is 1 mm ² ). The heat insulating structure according to any one of items 1 and 2. Among claims 1 to 6, characterized in that, in the coating layer, an area ratio of the cracks occupied by the cracks is 11.8% or less per unit area (here, the unit area is 1 mm ² ). The heat insulating structure according to any one of items 1 and 2. A method for forming a heat insulating structure according to any one of claims 1 to 7,
In applying the water-based coating agent to the front or back surface of the base paper, the next coating layer was applied before the previous coating layer dried, and the entire coating layer was dried to form the coating layer. After that, the base paper on which the coat layer is formed is subjected to the embossing process. A paper container comprising the heat insulating structure according to any one of claims 1 to 7. A heat insulating sheet comprising the heat insulating structure according to any one of claims 1 to 7 in a heat insulating sheet covering the outer surface of the paper container body. 11. The heat insulation according to claim 10, wherein the paper container body is a paper cup body, and the heat insulation sheet is a heat insulation outer sleeve wrapped around the outer periphery of the body of the paper cup body. sheet for. A paper cup comprising the heat insulating sheet according to claim 11. 10. The paper cup according to claim 9, wherein the paper container main body is a paper cup main body, has the heat insulating portion in its body, and has the coating layer on its surface.

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