JP7495701B2 - Paper and packaging materials - Google Patents

Description

The present invention relates to paper materials and packaging materials.

A conventional tissue packaging material that can be flushed down the toilet is one that is made of a mixture of polyester fibers, pulp fibers, and a water-decomposable binder for bonding the polyester fibers and the pulp fibers together (see, for example, Patent Document 1).

JP 2003-292026 A

In recent years, there has been an increasing need to reduce the environmental impact caused when packaging materials are flushed down the toilet. However, the water-decomposable binders constituting the above-mentioned conventional packaging materials only have water-decomposable properties, and there is a risk that the water-decomposable binders may not be decomposed by microorganisms, etc., so there is room for improvement in terms of reducing the environmental impact.

The present invention aims to solve the problems in the conventional technology described above, and to provide paper materials and packaging that can reduce the environmental impact.

In order to solve the above-mentioned problems and achieve the object, the paper material described in claim 1 is a water-decomposable paper material comprising pulp fibers, biodegradable resin fibers having heat-fusible and biodegradable properties, and vinylon fibers having a water dissolution temperature lower than the melting point of the biodegradable resin fibers, the water dissolution temperature being 70°C to 80°C, and the vinylon fibers bond the pulp fibers and the biodegradable resin fibers by thermal dissolution of the vinylon fibers , and the blending ratio of the pulp fibers, the biodegradable resin fibers, and the vinylon fibers is 30% to 50% by weight:38% to 60% by weight:12% by weight or less.

The paper material described in claim 2 is the paper material described in claim 1, wherein the basis weight of the paper material is 14 g/m ² to 40 g/m ² .

The paper material described in claim 3 is the paper material described in claim 1 or 2, wherein the elongation of the paper material is set to 3% to 5%.

The paper material described in claim 4 is the paper material described in any one of claims 1 to 3, wherein the smoothness of the paper material is set to 10 seconds to 20 seconds.

A paper material according to a fifth aspect of the present invention is the paper material according to any one of the first to fourth aspects, in which the biodegradable resin fibers are polylactic acid fibers.

The paper material according to a sixth aspect of the present invention is the paper material according to any one of the first to fifth aspects, wherein the paper material is a packaging paper material.

A packaging body according to a seventh aspect of the present invention is a packaging body made of the paper material according to any one of the first to sixth aspects of the present invention.

The packaging body according to the eighth aspect of the present invention is the packaging body according to the seventh aspect, which is a packaging body for tissue paper.

According to the paper material described in claim 1, the paper material is composed of pulp fibers, biodegradable resin fibers having thermal adhesion and biodegradability , and vinylon fibers having a water dissolution temperature lower than the melting point of the biodegradable resin fibers, and the vinylon fibers bond the pulp fibers and the biodegradable resin fibers by thermal dissolution of the vinylon fibers, so that the paper material has water-decomposability and biodegradability while also having increased durability, and the paper material's usability can be improved while reducing the environmental load. Also, the vinylon fibers are relatively easy to handle during the production of the paper material, which can improve the manufacturability of the paper material.
In addition, the blending ratio of pulp fiber, biodegradable resin fiber, and vinylon fiber is 30% to 50% by weight: 38% to 60% by weight: 12% by weight or less, which improves the water decomposability, biodegradability, and durability of the paper material compared to other blending ratios, making it easier to improve the usability of the paper material and reduce the environmental burden.

According to the paper material described in claim 2, the basis weight of the paper material is set to 14 g/m ² to 40 g/m ² , so that the water-decomposability and durability of the paper material can be improved compared to other basis weights, and the usability of the paper material can be easily improved.

According to the paper material described in claim 3, the elongation rate of the paper material is set to 3% to 5%, which improves the printability of the paper material compared to paper material with other elongation rates, and makes it possible to produce paper material with high decorativeness.

According to the paper material described in claim 4, the smoothness of the paper material is set to 10 to 20 seconds, so that compared to other smoothnesses, the amount of elongation of the paper material can be suppressed while improving smoothness, making it easier to improve the printability of the paper material.

According to the paper material described in claim 5, since the biodegradable resin fiber is polylactic acid fiber, it has relatively high water-decomposability and biodegradability, so that it is possible to enhance the water-decomposability and biodegradability of the paper material.

According to the paper material described in claim 6, since the paper material is a packaging paper material, it is possible to construct a packaging paper material that is hydrolytic, biodegradable, and durable, thereby reducing the environmental impact while increasing the usability of the packaging paper material.

According to the packaging body described in claim 7, since the packaging body is made of the paper material described in any one of claims 1 to 6, a packaging body having hydrolysis, biodegradability, and durability can be constructed, and the environmental burden can be reduced while improving the usability of the packaging body.

According to the packaging body described in claim 8, since the packaging body is a packaging body for tissue paper, a packaging body for tissue paper having water-decomposability, biodegradability, and durability can be constituted, and the usability of the packaging body for tissue paper can be improved while reducing the environmental load.

1 is a perspective view conceptually showing a package according to an embodiment of the present invention. FIG. 1 is a diagram showing the test results of a first blend ratio confirmation test. FIG. 13 is a diagram showing the test results of the second blend ratio confirmation test. 1A and 1B are diagrams showing test results of a basis weight confirmation test, in which FIG. 1A is a table showing the test results, and FIG. 1B is a graph showing the test results.

Below, we will explain in detail the embodiments of the paper material and packaging body according to this invention with reference to the attached drawings. First, [I] the basic concept of the embodiment will be explained, then [II] the specific content of the embodiment will be explained, and finally, [III] modified examples of the embodiment will be explained. However, the present invention is not limited to the embodiment.

[I] Basic Concept of the Embodiment First, the basic concept of the embodiment will be described. The embodiment generally relates to a water-decomposable paper material and a packaging material.

Here, "paper material" refers to a material made by bonding plant fibers and non-plant fibers, and is a concept that includes, for example, paper material for packaging, paper material for printing, paper material for cushioning, paper material for paper containers, etc., but in the embodiment, it will be described as paper material for packaging. Also, "packaging" refers to something made of the above paper material that packages an object to be packaged. Also, "object to be packaged" refers to an object that is packaged in the packaging, and is a concept that includes, for example, tissue paper, toilet rolls, plants such as seedlings, etc., but in the embodiment, it will be described as tissue paper.

[II] Specific Contents of the Embodiment Next, specific contents of the embodiment will be described.

(composition)
First, the configuration of a package according to an embodiment will be described. Fig. 1 is a perspective view conceptually showing a package according to an embodiment of the present invention. In the following description, the X direction in Fig. 1 is referred to as the left-right direction of the package (-X direction is the left direction of the package, and +X direction is the right direction of the package), the Y direction in Fig. 1 is referred to as the front-rear direction of the package (+Y direction is the front direction of the package, and -Y direction is the rear direction of the package), and the Z direction in Fig. 1 is referred to as the up-down direction of the package (+Z direction is the top direction of the package, and -Z direction is the bottom direction of the package).

The packaging body 1 is a tissue paper packaging body for packaging a packaging object P (specifically, tissue paper), and as shown in FIG. 1, includes a packaging body body 10, a connection part 20, and an opening part 30.

Here, the method of packaging the packaged object P in the package 1 is arbitrary, but in the embodiment, multiple packaged objects P are stacked vertically in a folded state (for example, folded horizontally in a Z-fold and vertically in half), and are packaged so that they can be taken out of the package 1 (specifically, the package body 10) one after the other (packaged in a so-called pop-up style).

(Configuration - Packaging Body)
The package body 10 is a basic structure of the package 1, and is formed of a hollow body (specifically, a substantially rectangular parallelepiped body) as shown in FIG.

For ease of explanation, the packaging body 10 shown in FIG. 1 will be divided into six regions. That is, the packaging body 10 is divided into a packaging front portion 11 that covers the front side of the packaging object P, a packaging rear portion 12 that covers the rear side of the packaging object P, a packaging left portion 13 that covers the left side of the packaging object P, a packaging right portion 14 that covers the right side of the packaging object P, a packaging top portion 15 that covers the top side of the packaging object P, and a packaging bottom portion 16 that covers the bottom side of the packaging object P.

The specific shape and size of the packaging body 10 can be any shape and size as long as the specified number of packaging objects P can be packaged within the packaging body 10, but in this embodiment, they are set as follows.

That is, as shown in FIG. 1, the planar shape of the packaging body 10 is set to be approximately rectangular. However, it is not limited to this, and may be set to, for example, a polygonal shape other than a rectangle (e.g., a hexagonal shape), a circular shape, an elliptical shape, etc.

The length of the packaging body 10 in the left-right direction is set to be longer than the length of the packaging object P in the left-right direction. The length of the packaging body 10 in the front-rear direction is set to be longer than the length of the packaging object P in the front-rear direction. The length of the packaging body 10 in the up-down direction is set to be longer than the total height of a predetermined number of packaging objects P. Details of the configuration of the packaging body 10 will be described later.

(Configuration - Connection)
The connection portion 20 is a connection means for connecting one part of the packaging body 10 to another part. The connection portion 20 is configured using, for example, a known connection means using heat (for example, heat sealing) or the like, and at least one connection portion 20 is provided in the packaging body 10. Specifically, the connection portion 20 is provided at a boundary between one part of any surface portion of the packaging body 10 and another part, and as an example, as shown in FIG. 1, the connection portion 20 may be provided at a boundary portion between an upper part and a lower part of the packaging body left surface portion 13, a boundary portion between an upper part and a lower part of the packaging body right surface portion 14, and a boundary portion between a front part and a rear part of the packaging body lower surface portion 16.

(Configuration - Opening section)
The opening portion 30 is an opening means for opening the packaging body 10. The opening portion 30 is configured using, for example, a known opening means (perforations, for example), and is provided on at least one surface of the packaging body 10. Specifically, as shown in Fig. 1, a linear opening portion 30 is provided on the packaging body upper surface portion 15 over substantially the entire length of the packaging body upper surface portion 15 in the left-right direction. However, without being limited thereto, for example, the opening portion 30 may be provided over only a portion of substantially the entire length of the packaging body upper surface portion 15 in the left-right direction, or may be provided over substantially the entire length of the packaging body upper surface portion 15 in the front-rear direction.

(Configuration - Details of the configuration of the packaging body)
Next, a detailed description will be given of the configuration of the package body 10. However, unless otherwise specified, the package body 10 can be manufactured in any shape, by any method, and from any material.

In this embodiment, as shown in FIG. 1, the package body 10 is made of a water-disintegratable paper material 50. This paper material 50 is a package paper material, and in this embodiment, it has the following characteristics.

(Configuration - Details of the configuration of the packaging body - Paper material - First feature)
First, the first characteristic of the paper material 50 is that it is made of pulp fibers, biodegradable resin fibers, and vinylon fibers (all not shown).

(Configuration-Details of the configuration of the packaging body-Paper material-First feature-Pulp fiber)
The pulp fibers are a part of the basic structure of the paper material 50. The pulp fibers are formed using, for example, known pulp fibers (for example, pulp fibers made of beaten pulp or unbeaten pulp).

(Configuration - Details of the configuration of the packaging body - Paper material - First feature - Biodegradable resin fiber)
The biodegradable resin fiber is another part of the basic structure of the paper material 50, and serves to enable the formation of the connection part 20 by thermal fusion of the biodegradable resin fiber. The biodegradable resin fiber is formed using, for example, fibers made of a known biodegradable resin having thermal fusion properties and biodegradability.

The specific type of biodegradable resin is arbitrary, and may be, for example, polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, casein, modified starch, or a combination of these. In the embodiment, fibers made of polylactic acid (hereinafter referred to as "polylactic acid fibers"), which has relatively high hydrolysis and biodegradability and a relatively high melting point (specifically, about 160°C), are used as the biodegradable resin fibers. This can increase the hydrolysis and biodegradability of the paper material 50.

(Configuration-Details of the configuration of the packaging body-Paper material-First feature-Vinylon fiber)
The vinylon fiber is another part of the basic structure of the paper material 50, and the pulp fiber and the biodegradable resin fiber are bonded together by thermally melting the vinylon fiber.

Here, "vinylon fiber" refers to a synthetic fiber formed by acetalizing polyvinyl alcohol, and has relatively high hydrolysis and biodegradability, as well as a water dissolution temperature lower than the melting point of biodegradable resin fibers (specifically, about 70°C to 80°C).

The reason for using vinylon fiber, which has a water dissolution temperature lower than the melting point of the biodegradable resin fiber, is that when manufacturing the paper material 50, only the vinylon fiber is thermally melted , thereby bonding the pulp fiber and the biodegradable resin fiber, thereby increasing the strength of the paper material 50.

(Configuration-Details of the configuration of the packaging body-Paper material-First feature-Other configurations)
In addition, the blending method of the pulp fiber, biodegradable resin fiber, and vinylon fiber is arbitrary, but in the embodiment, based on the test results described later, the blending ratio of these three (hereinafter referred to as "fiber blending ratio") is set as follows: pulp fiber: biodegradable resin fiber: vinylon fiber = 30% weight to 50% weight: 38% weight to 60% weight: 12% weight or less. As an example, the fiber blending ratio may be set to 40% weight: 48% weight: 12% weight. Note that, for example, from the viewpoint of the biodegradability of the paper material 50, the blending ratio of the pulp fiber may be set to a high level. Also, in order to reduce the odor of the biodegradable resin fiber (polylactic acid fiber), the blending ratio of the biodegradable resin fiber may be set to a low level.

By setting this ratio, the water-decomposability, biodegradability, and durability of the paper material 50 can be improved compared to other blending ratios, making it easier to improve the usability of the paper material 50 and reduce the environmental impact.

The first characteristic described above allows the paper material 50 to have hydrolytic and biodegradable properties while also having high durability, thereby improving the usability of the paper material 50 while reducing the environmental impact. Furthermore, since the vinylon fiber is relatively easy to handle when manufacturing the paper material 50, the manufacturability of the paper material 50 can be improved. Furthermore, it is possible to construct a packaging paper material and packaging body 1 (specifically, a packaging body for tissue paper) that are hydrolytic, biodegradable, and durable, thereby improving the usability of the packaging paper material and packaging body 1 while reducing the environmental impact.

(Configuration-Details of the configuration of the packaging body-Paper material-Second feature)
Next, the second characteristic of the paper material 50 is as follows.

(Configuration-Details of the configuration of the packaging body-Paper material-Second feature-Basis weight)
That is, first, based on the test results described later, the basis weight (weight per unit area) of the paper material 50 is set to 14 g/m ² to 40 g/m ^2. This makes it possible to improve the water-decomposability and durability of the paper material 50 compared to other basis weights, and makes it easier to improve the usability of the paper material 50.

However, this is not limited thereto. For example, if the water-disintegrability and durability of the paper material 50 can be ensured, the basis weight of the paper material 50 may be set to less than 14 g/ ^m2 , or may be set to more than 40 g/ ^m2 .

(Configuration-Details of the configuration of the packaging body-Paper material-Second feature-Regarding elongation rate)
In addition, the elongation rate of the paper material 50 (the ratio of the original length of the paper material 50 to the elongation amount of the paper material 50) is set to 3% to 5%. This makes it possible to improve the printability of the paper material 50 compared to other elongation rates, and to produce a paper material 50 with high decorativeness.

However, this is not limited thereto, and for example, if the printability of the paper material 50 can be ensured, the elongation rate of the paper material 50 may be set to less than 3%, or may be set to more than 5%.

(Configuration-Details of the configuration of the packaging body-Paper material-Second feature-Regarding smoothness)
In addition, the smoothness (degree of flatness) of the paper material 50 is set to 10 to 20 seconds. This makes it possible to suppress the amount of stretch of the paper material 50 while increasing the smoothness, compared to other smoothness settings, and makes it easier to increase the printability of the paper material 50.

However, this is not limited thereto, and for example, if the printability of the paper material 50 can be ensured, the smoothness of the paper material 50 may be set to less than 10 seconds, or may be set to more than 20 seconds.

The method for setting the elongation rate and smoothness of the paper material 50 is arbitrary, but may be set, for example, by adjusting the degree of processing related to the calendaring applied to the paper material 50 depending on the type of paper material 50, etc.

The second characteristic described above can improve the water-dissolvability, durability, and printability of the paper material 50, thereby making it possible to improve the usability of the paper material 50.

(Manufacturing method of package)
Next, a description will be given of a method for manufacturing the package 1. The manufacturing method according to the embodiment includes a first forming step, a second forming step, and a packaging step.

(Manufacturing method of packaging body - first forming step)
First, the first forming step will be described. The first forming step is a step of forming the paper material 50.

Specifically, first, a known papermaking machine (not shown) is used to form a sheet from a mixture of pulp fibers, biodegradable resin fibers, and vinylon fibers in a fiber blend ratio, to which water is added, and then the water is squeezed out of the sheet using the press roll of the papermaking machine. Next, the sheet is heated and dried using the drying section of the papermaking machine at a temperature at which the thermal fusion properties of the vinylon fibers are expressed (approximately 80 to 110°C). Next, a known calendaring machine (not shown) is used to smooth the surface of the sheet to the desired elongation and smoothness (i.e., calendaring is performed). After that, a known printing machine (not shown) is used to print a predetermined pattern on the surface of the sheet, and the printed sheet is wound into a roll.

(Manufacturing method of packaging body - second forming step)
Next, the second forming step will be described. The second forming step is a step of forming the package body 10 and the opening portion 30 after the first forming step.

Specifically, the paper material 50 formed in the first forming process is cut to a predetermined size and shape using a known cutting device (not shown), thereby forming the package body 10. Next, a known processing device (not shown) is used to perform perforation processing on the portion of the package body 10 that corresponds to the package top surface portion 15, thereby forming the opening portion 30.

(Manufacturing method of packaged body - packaging process)
Next, the packaging step will be described. The packaging step is a step of packaging the packaging object P in the packaging body 10 formed in the second forming step after the second forming step.

Specifically, first, a part of the packaging body 10 is heat-sealed to another part using a welding part of a known packaging device (not shown) so that the packaging body 10 is formed into a substantially rectangular parallelepiped body having an open end, thereby forming some of the multiple connection parts 20. Next, the packaging device is used to insert the multiple packaging objects P stacked together via the open end of the packaging body 10 into the packaging body 10. After that, the part of the packaging body 10 is heat-sealed to another part so that the packaging body 10 is sealed, thereby forming all of the other parts of the multiple connection parts 20.

This manufacturing method allows the packaging body 1 to be manufactured in a manner substantially identical to the manufacturing method for conventional packaging bodies, and the manufacturability of the packaging body 1 can be maintained.

(Test results)
Next, the results of various tests conducted by the applicant will be described. The following describes the first mixture ratio confirmation test, the second mixture ratio confirmation test, and the basis weight confirmation test conducted to confirm the water disintegrability and durability of the paper material 50 according to the present invention.

(Test results - Summary of the first mixture ratio confirmation test)
First, an outline of the first blend ratio confirmation test will be described. Here, the "first blend ratio confirmation test" is a test for confirming the blend ratio of the pulp fiber and the biodegradable resin fiber.

The test subjects for this first blend ratio confirmation test are specimens made of paper material 50 according to the embodiment, which are divided into specimens A11 to A17 whose pulp fiber type is made of beaten pulp, and specimens A21 to A27 whose pulp fiber type is made of unbeaten pulp.

Among these, the specimen A11 is a specimen with a fiber blend ratio of 20% weight: 68% weight: 12% weight, and a basis weight of 28.6 g/ ^m2 . The specimen A12 is a specimen with a fiber blend ratio of 30% weight: 58% weight: 12% weight, and a basis weight of 29.6 g/ ^m2 . The specimen A13 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 29.2 g/ ^m2 . The specimen A14 is a specimen with a fiber blend ratio of 50% weight: 38% weight: 12% weight, and a basis weight of 30.2 g/ ^m2 . The specimen A15 is a specimen with a fiber blend ratio of 60% weight: 28% weight: 12% weight, and a basis weight of 30.4 g/ ^m2 . The specimen A16 has a fiber blend ratio of 70% by weight: 18% by weight: 12% by weight, and a basis weight of 32.6 g/ ^m2 . The specimen A17 has a fiber blend ratio of 80% by weight: 8% by weight: 12% by weight, and a basis weight of 32.2 g/ ^m2 .

The specimen A21 is a specimen with a fiber blend ratio of 20% weight: 68% weight: 12% weight, and a basis weight of 27.8 g/ ^m2 . The specimen A22 is a specimen with a fiber blend ratio of 30% weight: 58% weight: 12% weight, and a basis weight of 28.2 g/ ^m2 . The specimen A23 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 29.1 g/ ^m2 . The specimen A24 is a specimen with a fiber blend ratio of 50% weight: 38% weight: 12% weight, and a basis weight of 29.6 g/ ^m2 . The specimen A25 is a specimen with a fiber blend ratio of 60% weight: 28% weight: 12% weight, and a basis weight of 30.4 g/ ^m2 . Specimen A26 is a specimen with a fiber blend ratio of 70% weight: 18% weight: 12% weight, and a basis weight of 30.9 g/ ^m2 . Specimen A27 is a specimen with a fiber blend ratio of 80% weight: 8% weight: 12% weight, and a basis weight of 31.2 g/ ^m2 .

In addition, for the test method of the first blend ratio confirmation test, a tensile strength test, a fraying ease test, and a heat seal strength test will be conducted on each specimen.

For the tensile strength test, a known tensile testing device is used to pull each test specimen, and the tensile strength at which the specimen breaks is measured.

For the ease of unraveling test, each piece of paper is dropped into water stirred at 600 revolutions per minute, and the resistance of the paper causes the rotation speed to temporarily drop to about 500 revolutions per minute. The time it takes for the paper to unravel and the rotation speed to return to 540 revolutions is then measured.

For the heat seal strength test, the two pieces of paper that make up each test specimen are joined together via a heat seal, and then a T-shaped tensile test is performed using a known tensile testing device to measure the heat seal strength when the heat seal breaks.

(Test results - details of the first mixture ratio confirmation test)
Next, the details of the test results of the first blend ratio confirmation test will be described. Fig. 2 is a diagram showing the test results of the first blend ratio confirmation test.

As shown in Figure 2, for test specimens A11 to A17 and A21 to A27, as the blending ratio of pulp fiber increases and the amount of biodegradable resin fiber decreases, the tensile strength tends to increase and the tendency to unravel tends to decrease. On the other hand, the heat seal strength tends to increase when the blending ratio of pulp fiber is in the range of 20% to 50% by weight, but tends to decrease when the blending ratio is in the range of 50% to 80% by weight.

The tensile strength and heat seal strength of test specimens A11 to A17 were generally higher than those of test specimens A21 to A27, but the ease of unraveling of test specimens A11 to A17 was lower than that of test specimens A21 to A27.

Furthermore, in comparison with the standard values, for ease of unraveling, test specimens A11 to A14 and test specimens A21 to A24 met the standard value (within 100 sec), but the other test specimens did not meet the standard value. For heat seal strength, test specimens A12 to A14 and test specimens A22 and A23 met the standard value (4N or more), but the other test specimens did not meet the standard value.

The test results shown in Figure 2 show that test specimens A12 to A14, and test specimens A22 and A23 have hydrolysis and durability, and confirm the effectiveness of setting the pulp fiber blend ratio at 30% to 50% by weight and the biodegradable resin fiber blend ratio at 38% to 58% by weight.

(Test results - Summary of the second mixture ratio confirmation test)
Next, the outline of the second blend ratio confirmation test will be described. Here, the "second blend ratio confirmation test" is a test for confirming the blend ratio of the biodegradable resin fiber and the vinylon fiber.

For the test subjects of this second blend ratio confirmation test, the specimens made of the paper material 50 according to the embodiment are divided into 11 types with different fiber blend ratios (hereinafter referred to as "test specimen B1" to "test specimen B11").

Among these, specimen B1 is a specimen with a fiber blend ratio of 20% weight: 68% weight: 12% weight, and a basis weight of 28.6 g/ ^m2 . Specimen B2 is a specimen with a fiber blend ratio of 30% weight: 58% weight: 12% weight, and a basis weight of 29.6 g/ ^m2 . Specimen B3 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 29.2 g/ ^m2 . Specimen B4 is a specimen with a fiber blend ratio of 40% weight: 54% weight: 6% weight, and a basis weight of 30.8 g/ ^m2 . Specimen B5 is a specimen with a fiber blend ratio of 40% weight: 60% weight: 0% weight, and a basis weight of 30.4 g/ ^m2 . The specimen B6 is a specimen with a fiber blend ratio of 50% weight: 38% weight: 12% weight, and a basis weight of 30.2 g/ ^m2 . The specimen B7 is a specimen with a fiber blend ratio of 50% weight: 44% weight: 6% weight, and a basis weight of 30.6 g/ ^m2 . The specimen B8 is a specimen with a fiber blend ratio of 50% weight: 50% weight: 0% weight, and a basis weight of 29.8 g/ ^m2 . The specimen B9 is a specimen with a fiber blend ratio of 60% weight: 28% weight: 12% weight, and a basis weight of 30.4 g/ ^m2 . The specimen B10 is a specimen with a fiber blend ratio of 70% weight: 18% weight: 12% weight, and a basis weight of 32.6 g/ ^m2 . In addition, test specimen B11 is a test specimen having a fiber blending ratio = 80% weight: 8% weight: 12% weight and a basis weight = 32.2 g/ ^m2 .

The test method for the second blend ratio confirmation test will be the same as that for the first blend ratio confirmation test.

(Test results - details of the second mixture ratio confirmation test)
Next, the details of the test results of the second blend ratio confirmation test will be described. Fig. 3 is a diagram showing the test results of the second blend ratio confirmation test.

As shown in Figure 3, for specimens B1 to B11, as the blending ratio of biodegradable resin fiber increases, the tensile strength tends to decrease and the ease of unraveling tends to decrease. Also, as the blending ratio of vinylon fiber decreases, the tensile strength tends to decrease and the ease of unraveling tends to decrease.

Furthermore, in comparison with the standard values, for ease of unraveling, specimens B1 to B5 and B8 met the standard value (within 100 sec), but the other specimens did not. For heat seal strength, specimens B2 to B7 met the standard value (4N or more), but the other specimens did not.

The test results shown in Figure 3 show that specimens B2 to B5 are hydrolyzable and durable, and confirm the effectiveness of setting the blend ratio of biodegradable resin fibers to 38% to 60% by weight and the blend ratio of vinylon fibers to 0% to 12% by weight.

(Test results - Overview of basis weight confirmation test)
Next, an overview of the basis weight confirmation test will be described. Here, the "basis weight confirmation test" is a test for confirming the basis weight of the paper material 50.

For the test subjects of this basis weight confirmation test, the test specimens made of the paper material 50 according to the embodiment are divided into six types with different basis weights of the paper material 50 (hereinafter referred to as "test specimens C1" to "test specimens C6").

Among these, specimen C1 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 20 g/ ^m2 . Specimen C2 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 30 g/ ^m2 . Specimen C3 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 40 g/ ^m2 . Specimen C4 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 50 g/ ^m2 . Specimen C5 is a specimen with a fiber blend ratio of 40% weight: 48% weight: 12% weight, and a basis weight of 60 g/ ^m2 . In addition, specimen C6 is a specimen having a fiber blend ratio of 40% by weight: 48% by weight: 12% by weight and a basis weight of 70 g/ ^m2 .

The test method for the basis weight confirmation test will be the same as that for the first blend ratio confirmation test.

(Test results - details of the test results of the basis weight confirmation test)
Next, the details of the test results of the basis weight confirmation test will be described. Fig. 4 is a diagram showing the test results of the basis weight confirmation test, where (a) is a diagram showing a table of the test results, and (b) is a diagram showing a graph of the test results.

As shown in Figure 4, for test specimens C1 to C6, as the basis weight increases, the tensile strength and heat seal strength tend to increase and the tendency for fraying to decrease.

Furthermore, in comparison with the standard values, while specimens C1 to C3 met the standard value (within 100 sec) for ease of unraveling, the other specimens did not meet the standard value. In addition, specimens C1 to C6 met the standard value (4N or more) for heat seal strength.

From the test results shown in Fig. 4, it was found that the test specimens C1 to C3 had water-disintegrability and durability. Also, as shown in Fig. 4(b), from the approximation formula derived from the test results of the heat seal strength of the test specimens C1 to C3, it was found that even the lower limit of the basis weight of the actual paper material 50, 14 g/ ^m2 , had water-disintegrability and durability that met the standard values. From the above, it was confirmed that the effectiveness of setting the basis weight to 14 g/ ^m2 to 40 g/ ^m2 .

(effect)
Thus, according to the embodiment, the paper material 50 is made of pulp fibers, biodegradable resin fibers having thermal adhesion and biodegradability, and vinylon fibers having a water dissolution temperature lower than the melting point of the biodegradable resin fibers, which bond the pulp fibers and the biodegradable resin fibers by thermal dissolution of the vinylon fibers, so that the paper material 50 has water-decomposability and biodegradability while also having high durability, and can reduce the environmental load while improving the usability of the paper material 50. Furthermore, since the vinylon fibers are relatively easy to handle when manufacturing the paper material 50, the manufacturability of the paper material 50 can be improved.

In addition, the blending ratio of pulp fiber, biodegradable resin fiber, and vinylon fiber is 30%-50% by weight: 38%-60% by weight: 12% by weight or less, which improves the water-decomposability, biodegradability, and durability of the paper material 50 compared to other blending ratios, making it easier to improve the usability of the paper material 50 and reduce the environmental impact.

Furthermore, since the basis weight of the paper material 50 is set to 14 g/m ² to 40 g/m ² , the water-decomposability and durability of the paper material 50 can be improved compared to other basis weights, making it easier to improve the usability of the paper material 50.

In addition, the elongation rate of the paper material 50 is set to 3% to 5%, which improves the printability of the paper material 50 compared to other elongation rates, allowing the production of highly decorative paper material 50.

In addition, the smoothness of the paper material 50 is set to 10 to 20 seconds, which makes it possible to suppress the amount of stretch of the paper material 50 while increasing the smoothness compared to other smoothnesses, making it easier to improve the printability of the paper material 50.

In addition, since the biodegradable resin fiber is a polylactic acid fiber, it has relatively high hydrolysis and biodegradability, which makes it possible to increase the hydrolysis and biodegradability of the paper material 50.

In addition, because the paper material 50 is a packaging paper material, it is possible to construct a packaging paper material that is hydrolytic, biodegradable, and durable, thereby reducing the environmental impact while increasing the usability of the packaging paper material.

In addition, since the packaging body 1 is made of paper material 50, the packaging body 1 can be made to be hydrolytic, biodegradable, and durable, and the usability of the packaging body 1 can be improved while reducing the environmental impact.

In addition, since the packaging body 1 is a packaging body for tissue paper, a packaging body for tissue paper that is hydrolytic, biodegradable, and durable can be constructed, and the environmental impact can be reduced while improving the usability of the packaging body for tissue paper.

[III] Modifications to the embodiment The embodiment of the present invention has been described above, but the specific configuration and means of the present invention can be modified and improved as desired within the scope of the technical ideas of each invention described in the claims. Such modifications will be described below.

(About the problem to be solved and the effects of the invention)
First, the problems that the invention aims to solve and the effects of the invention are not limited to those described above, and the present invention may solve problems that are not described above or achieve effects that are not described above, or may solve only some of the problems that are described or achieve only some of the effects that are described.

(shape, number, structure, time series)
The components illustrated in the embodiments and drawings may be modified and improved as desired within the scope of the technical concept of the present invention with respect to the shape, numerical values, or structure or chronological relationships of multiple components.

(About packaging items)
In the above embodiment, the packaging method for the packaging objects P has been described as a method in which the packaging objects P are stacked vertically in a state in which they are folded and overlap each other, and are packaged so that they can be continuously removed from the package 1, but this is not limiting. For example, only one packaging object P may be packaged without folding.

(Regarding packaging)
In the above embodiment, the packaging body 1 has been described as a packaging body for tissue paper, but is not limited thereto, and may be, for example, a packaging body for toilet rolls, a packaging body for plants, etc.

(Regarding the packaging body)
In the above embodiment, it has been described that the packaging body 10 is formed in an approximately rectangular prism shape, but this is not limited thereto, and the packaging body 10 may be formed in a shape other than an approximately rectangular prism shape (for example, a cylindrical body, a spherical body, or a pyramidal body (as an example, a conical body)).

(Regarding the opening part)
In the above embodiment, the number of opening portions 30 provided is one. However, the present invention is not limited to this, and may be, for example, two or more.

In the above embodiment, the package 1 is described as having an opening portion 30, but this is not limiting, and for example, the opening portion 30 may be omitted. In this case, the formation of the opening portion 30 in the second formation process can be omitted.

(Regarding the manufacturing method of the package)
In the above embodiment, the first forming step is described as performing calendering or printing on the sheet-like body, but the present invention is not limited to this. For example, the calendering or printing may be omitted.

(Additional Note)
The paper material of Appendix 1 is a water-decomposable paper material comprising pulp fibers, biodegradable resin fibers having thermal adhesion and biodegradability, and vinylon fibers having a melting point lower than that of the pulp fibers and that of the biodegradable resin fibers, the vinylon fibers bonding the pulp fibers and the biodegradable resin fibers by thermal melting of the vinylon fibers.

The paper material in Appendix 2 is the paper material in Appendix 1, in which the blending ratio of the pulp fiber, the biodegradable resin fiber, and the vinylon fiber is 30%-50% by weight: 38%-60% by weight: 12% by weight or less.

The paper material in Appendix 3 is the paper material described in Appendix 1 or 2, wherein the basis weight of the paper material is 14 g/m ² to 40 g/m ² .

The paper material in Appendix 4 is the paper material described in any one of Appendixes 1 to 3, and the elongation of the paper material is set to 3% to 5%.

The paper material in Appendix 5 is the paper material described in any one of Appendixes 1 to 4, and the smoothness of the paper material is set to 10 to 20 seconds.

The paper material of Appendix 6 is the paper material described in any one of Appendixes 1 to 5, in which the biodegradable resin fiber is polylactic acid fiber.

The paper material in Appendix 7 is the paper material described in any one of Appendixes 1 to 6, and the paper material is a packaging paper material.

The packaging material of Appendix 8 is a packaging material made of the paper material described in any one of Appendixes 1 to 7.

The packaging in Appendix 9 is the packaging in Appendix 8, and is a packaging for tissue paper.

(Effect of supplementary notes)
According to the paper material described in Appendix 1, the paper material is composed of pulp fibers, biodegradable resin fibers having thermal adhesion and biodegradability, and vinylon fibers having a melting point lower than that of the pulp fibers and the biodegradable resin fibers, and bonding the pulp fibers and the biodegradable resin fibers by thermal melting of the vinylon fibers, so that the paper material can have water-decomposability and biodegradability while also having increased durability, and the paper material can be made more usable while reducing the environmental load. Also, since the vinylon fibers are relatively easy to handle during the production of the paper material, the manufacturability of the paper material can be improved.

According to the paper material described in Appendix 2, the blending ratio of pulp fiber, biodegradable resin fiber, and vinylon fiber is 30%-50% by weight: 38%-60% by weight: 12% by weight or less, which makes it possible to improve the water decomposability, biodegradability, and durability of the paper material compared to other blending ratios, making it easier to increase the usability of the paper material and reduce the environmental burden.

According to the paper material described in Appendix 3, the basis weight of the paper material is set to 14 g/m ² to 40 g/m ² , so that the water-decomposability and durability of the paper material can be improved compared to other basis weights, and the usability of the paper material can be easily improved.

According to the paper material described in Appendix 4, the elongation rate of the paper material is set to 3% to 5%, which improves the printability of the paper material compared to other elongation rates, and allows the production of highly decorative paper material.

According to the paper material described in Appendix 5, the smoothness of the paper material is set to 10 to 20 seconds, which makes it possible to suppress the amount of stretching of the paper material while increasing the smoothness compared to other smoothnesses, making it easier to improve the printability of the paper material.

According to the paper material described in Appendix 6, the biodegradable resin fiber is polylactic acid fiber, which has relatively high hydrolysis and biodegradability, making it possible to increase the hydrolysis and biodegradability of the paper material.

The paper material described in Appendix 7 is a packaging paper material, so it is possible to produce a packaging paper material that is hydrolytic, biodegradable, and durable, thereby reducing the environmental impact while improving the usability of the packaging paper material.

According to the paper material described in Appendix 8, the packaging body is made of the paper material described in any one of Appendixes 1 to 7, so that a packaging body that is hydrolytic, biodegradable, and durable can be constructed, and the environmental burden can be reduced while improving the usability of the packaging body.

According to the packaging body described in Appendix 9, since the packaging body is a packaging body for tissue paper, it is possible to construct a packaging body for tissue paper that is hydrolytic, biodegradable, and durable, and it is possible to reduce the environmental burden while improving the usability of the packaging body for tissue paper.

REFERENCE SIGNS LIST 1 Package 10 Package body 11 Package front portion 12 Package rear portion 13 Package left portion 14 Package right portion 15 Package top portion 16 Package bottom portion 20 Connection portion 30 Opening portion 50 Paper material P Packaged object

Claims (8)

A water-decomposable paper material,
Pulp fibers;
a biodegradable resin fiber having thermal adhesiveness and biodegradability;
a vinylon fiber having a water dissolution temperature lower than the melting point of the biodegradable resin fiber, the water dissolution temperature being 70°C to 80°C, and the pulp fiber and the biodegradable resin fiber are bonded together by thermal dissolution of the vinylon fiber ;
The blending ratio of the pulp fiber, the biodegradable resin fiber, and the vinylon fiber is 30% to 50% by weight: 38% to 60% by weight: 12% by weight or less.
Paper material. The basis weight of the paper material is 14 g/m ² to 40 g/m ² .
2. The paper material of claim 1. The elongation rate of the paper material is set to 3% to 5%.
3. The paper material according to claim 1 or 2. The smoothness of the paper material was set to 10 to 20 seconds.
A paper material according to any one of claims 1 to 3. The biodegradable resin fiber is a polylactic acid fiber.
A paper material according to any one of claims 1 to 4. The paper material is a packaging paper material.
A paper material according to any one of claims 1 to 5. A packaging material made of the paper material according to any one of claims 1 to 6. The packaging is a packaging for tissue paper.
The package according to claim 7.

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