JP7477828B2 - Paper products and methods for manufacturing paper products - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies Distribution location: Tokyo Big Sight West, South, and Aomi Exhibition Halls (1-11-1 Ariake 3-chome, Koto-ku, Tokyo) Distribution date: July 3, 2019

The present invention relates to paper products and methods for manufacturing paper products.

One of the techniques proposed for producing lotion tissue paper to date involves performing a calendaring process on a sheet whose main component is pulp, applying a chemical solution to the sheet, and then stacking multiple sheets coated with the chemical solution and placing them in a carton (see, for example, Patent Document 1). The chemical solution applied to the sheet contains a polyhydric alcohol such as glycerin.

JP 2016-060982 A

As described above, in the conventional technology, the chemical solution applied to the sheet contains a polyhydric alcohol, and therefore the viscosity of the chemical solution tends to be relatively high (especially when the temperature of the chemical solution is low, the viscosity becomes very high). For this reason, for example, the chemical solution must be heated to lower the viscosity of the chemical solution so that it can be easily applied to the sheet, and this operation requires time and cost, so there is room for improvement in terms of manufacturability.

The present invention is intended to solve the problems in the above-mentioned conventional technology, and aims to provide a paper product and a method for manufacturing a paper product that can improve manufacturability.

In order to solve the above-mentioned problems and achieve the objective, the paper product manufacturing method described in claim 1 is a manufacturing method for manufacturing a paper product consisting of at least one paper sheet body, and includes a coating process of applying a chemical solution to the sheet body, wherein the chemical solution includes a moisturizing system chemical solution having moisturizing properties and cellulose nanofibers, and the content of the cellulose nanofibers in the moisturizing system chemical solution is 0.03% or more and 0.15% or less.

The method for producing a paper product described in claim 2 is the method for producing a paper product described in claim 1, in which the content of the cellulose nanofiber in the moisturizing liquid is 0.06% or less.

The method for producing a paper product according to claim 3 is the method for producing a paper product according to claim 1 or 2, in which the cellulose nanofibers are formed from citrus peel.

The method for manufacturing a paper product described in claim 4 is a method for manufacturing a paper product described in any one of claims 1 to 3, further including a viscosity adjustment step carried out before the application step, in which the viscosity of the chemical solution is adjusted by stirring the chemical solution.

The method for manufacturing a paper product described in claim 5 is a method for manufacturing a paper product described in any one of claims 1 to 4 , in which the paper product is tissue paper formed by laminating a plurality of the sheet bodies, and the amount of the chemical solution applied per layer of the sheet body in the application process is 10% by weight to 30% by weight.

The paper product described in claim 6 is a paper product consisting of at least one paper sheet body, and includes the sheet body to which a chemical solution is applied, the chemical solution containing a moisturizing chemical solution having moisturizing properties and cellulose nanofibers, and the content of the cellulose nanofibers in the moisturizing chemical solution is 0.03% or more and 0.15% or less.

According to the method for manufacturing a paper product as set forth in claim 1 and the paper product as set forth in claim 6 , a coating step is included in which a chemical solution is applied to a sheet body, and since the chemical solution contains a moisturizing chemical solution having moisturizing properties and cellulose nanofibers, the viscosity of the chemical solution can be lowered and the chemical solution can be applied to the sheet body more easily than when only a moisturizing chemical solution is applied to the sheet body in the coating step. Therefore, the labor and cost of heating the chemical solution in the manufacturing method can be reduced, and the manufacturability of the paper product can be improved.
Furthermore, since the cellulose nanofiber content in the moisturizing chemical solution is 0.03% or more and 0.15% or less, the viscosity of the chemical solution can be reduced while forming a relatively soft paper product compared to when the cellulose nanofiber content in the moisturizing chemical solution exceeds 0.15%, and the flexibility of the paper product can be increased while maintaining the manufacturability of the paper product.

According to the method for manufacturing paper products described in claim 2, the content of cellulose nanofiber in the moisturizing chemical solution is 0.06% or less, so that the viscosity of the chemical solution can be lowered while reducing the amount of cellulose nanofiber added, and a relatively soft paper product can be formed, compared to when the content of cellulose nanofiber in the moisturizing chemical solution exceeds 0.06%, thereby further improving the manufacturability of the paper product.

According to the method for producing paper products described in claim 3, since the cellulose nanofibers are formed from citrus peels, the cellulose nanofibers can be produced relatively inexpensively, reducing the production costs of paper products. In addition, the occurrence of chemical reactions that would impair the quality of the moisturizing chemicals can be avoided, making it easier to maintain the quality of the chemicals.

According to the method for producing paper products described in claim 4, the method further includes a viscosity adjustment step performed before the application step, in which the viscosity of the chemical solution is adjusted by stirring the chemical solution, so that the viscosity of the chemical solution can be reduced by the thixotropy of the cellulose nanofiber (the property of decreasing viscosity when force is applied) and the viscosity of the chemical solution can be adjusted according to the needs of the user. Furthermore, the viscosity of the chemical solution can be easily adjusted using relatively simple equipment, making it possible to maintain the manufacturability of paper products.

According to the method for manufacturing a paper product described in claim 5, the paper product is tissue paper made of multiple laminated sheets, and the amount of chemical solution applied per layer of sheet material in the coating process is set to 10% by weight to 30% by weight, so that tissue paper with moisture retention can be reliably manufactured and the manufacturability of the tissue paper can be improved.

FIG. 1 is a perspective view conceptually illustrating a paper product and a container according to an embodiment of the present invention. 5A to 5C are diagrams illustrating a lamination process of the manufacturing method according to the embodiment. 1A to 1C are diagrams illustrating a forming step and a packaging step of a manufacturing method according to an embodiment. FIG. 1 is a diagram showing test results of a first viscosity confirmation test. FIG. 11 is a diagram showing the test results of a second viscosity confirmation test. FIG. 13 is a diagram showing the test results of a paper quality confirmation test. FIG. 1 is a diagram showing the test results of a sensory test.

Below, with reference to the attached drawings, an embodiment of the paper product and the method for manufacturing the paper product according to the present invention will be described in detail. 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 paper product made of at least one paper sheet body, and a manufacturing method for the paper product.

Here, the type of "paper product" is arbitrary, but the concept includes, for example, tissue paper, paper towels, toilet paper, kitchen paper, etc., but in the embodiment, it will be described as tissue paper made of two laminated sheets (specifically, moisturizing tissue paper).

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

(composition)
Here, the configuration of a paper product 1 according to the embodiment and the configuration of a container 20 in which the paper product is stored will be described.

(Composition - Paper products)
First, the configuration of the paper product 1 will be described. Fig. 1 is a perspective view conceptually showing a paper product 1 and a container 20 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 paper product 1 (the -X direction is the left direction of the paper product 1, and the +X direction is the right direction of the paper product 1), the Y direction in Fig. 1 is referred to as the front-rear direction of the paper product 1 (the +Y direction is the front direction of the paper product 1, and the -Y direction is the rear direction of the paper product 1), and the Z direction in Fig. 1 is referred to as the up-down direction of the paper product 1 (the +Z direction is the upward direction of the paper product 1, and the -Z direction is the downward direction of the paper product 1).

The paper product 1 is composed of at least one paper sheet 10 coated with a chemical solution (not shown), and is specifically constructed by integrating two sheets 10 into a stack using a known processing method (calendering, for example). As shown in FIG. 1, the paper product 1 is stored inside a container 20 (shown by a two-dot chain line in FIG. 1), and is specifically stored in a state where multiple paper products are arranged in a vertically stacked manner using a known storage method (such as a method of storing the paper products in a pop-up style so that they can be removed).

(Construction-Paper product-Sheet body)
Next, a description will be given of the configuration of the sheet body 10. The sheet body 10 is the basic structure of the paper product 1, and is configured, for example, using a known paper sheet material (one example is a sheet material for moisturizing tissue paper).

The specific shape and size of the sheet body 10 are arbitrary, but in the embodiment, they are as follows. That is, the planar shape of the sheet body 10 is set to be approximately rectangular (specifically, approximately rectangular). However, it is not limited to this, and may be set to, for example, a polygonal shape other than approximately rectangular (for example, a triangular shape), a circular shape, or an elliptical shape. The left-right length and front-back length of the sheet body 10 are set to lengths that meet a predetermined standard, and the left-right length of the sheet body 10 is set to be longer than the front-back length of the sheet body 10. The thickness (vertical length) of the sheet body 10 is set based on experimental results, etc., because it is desirable to make it as thin as possible while still maintaining the desired strength.

The material of the sheet body 10 is arbitrary, but it may be made of, for example, wood pulp, recycled paper pulp, non-wood pulp, or a combination of these.

(Composition - Paper products - Chemical solutions)
Next, the composition of the chemical liquid will be described. The chemical liquid is a liquid for imparting a moisture retaining function and a moisture absorbing function to the sheet member 10, and is configured to contain a moisture retaining chemical liquid and cellulose nanofibers (both are not shown).

(Composition - Paper products - Chemicals - Moisturizing chemicals)
The moisturizing liquid chemical is a liquid having moisturizing properties, and is constituted, for example, by a known liquid chemical for moisturizing tissue paper, and specifically, is constituted by containing polyhydric alcohol, water, and the like.

The specific type of polyhydric alcohol is not limited, but in the embodiment, glycerin is used, which is inexpensive and safe to handle. However, the present invention is not limited to this, and other examples that may be used include polyethylene glycol, diglycerin, ethylene glycol, propylene glycol, 1,3-butylene glycol, polyglycerin, polypropylene glycol, sorbitol, xylitol, and erythritol.

Such moisturizing chemicals can impart moisturizing and moisture absorbing properties to the sheet body 10, making it possible to obtain a moist and soft texture from the sheet body 10.

(Composition - Paper products - Chemical solutions - Cellulose nanofibers)
The cellulose nanofiber is intended to reduce the viscosity of moisturizing chemicals. The cellulose nanofiber is made of cellulose derived from the cell walls of plants (e.g., wood, weeds, vegetables, fruits, or biomass made from waste materials thereof), and specifically, is made of fibrous cellulose having a diameter of several nm to 100 nm and a length 100 times or more the diameter.

The method of blending the cellulose nanofibers is optional, but in the embodiment, as shown in the test results described later, the cellulose nanofibers are blended so that the content of the cellulose nanofibers in the moisturizing liquid is 0.03% or more and 0.15% or less, and as an example, it is desirable to blend them so that they are 0.06% or less. With this blending method, the viscosity of the liquid can be reduced and the paper product 1 can be formed relatively soft, compared to when the content of the cellulose nanofibers in the moisturizing liquid exceeds 0.15%, and the flexibility of the paper product 1 can be increased while maintaining the manufacturability of the paper product 1. Furthermore, compared to when the content of the cellulose nanofibers in the moisturizing liquid exceeds 0.06%, the viscosity of the liquid can be reduced and the paper product 1 can be formed relatively soft, while reducing the amount of cellulose nanofiber added, and the manufacturability of the paper product 1 can be further improved. However, this is not limited to this, and the content may be set to, for example, less than 0.03% or more than 0.15%.

The cellulose nanofibers may be made of any material, but in this embodiment, they are made from citrus peel. This allows the cellulose nanofibers to be produced relatively inexpensively, reducing the manufacturing costs of the paper product 1. It also prevents chemical reactions that may impair the quality of the moisturizing chemical solution, making it easier to maintain the quality of the chemical solution. However, this is not limiting, and the cellulose nanofibers may be made from, for example, wood pulp, recycled paper pulp, etc.

(Composition - Paper products - Chemical solutions - Other compositions)
The amount of chemical solution applied can be any amount as long as a moist and soft texture can be obtained from the sheet body 10, but in the embodiment, the amount of chemical solution applied per layer of the sheet body 10 is 10% to 30% by weight. However, the present invention is not limited to this amount, and the amount may be applied according to, for example, the type of paper product 1 or the manufacturing environment, and as one example, the amount may be less than 10% by weight or more than 30% by weight.

(Composition - Paper products - Other compositions)
The specific configuration of the sheet body 10 in the state where the chemical solution is applied is arbitrary, but in the embodiment, it is set as follows. That is, the basis weight per layer of the sheet body 10 (specifically, the basis weight based on JIS P 8124 (2011)) is set to 10 to 15 g/ ^m2 . The thickness per layer of the sheet body 10 (specifically, the thickness based on JIS P 8111 (1998)) is set to 35 μm to 60 μm. With such a configuration, it is possible to obtain a moist and soft texture from the paper product 1 while maintaining the manufacturability of the paper product 1. However, without being limited thereto, for example, the basis weight may be set to less than 10 g/ ^m2 or more than 15 g/ ^m2 . The thickness may be set to less than 35 μm or more than 60 μm.

With the paper product 1 described above, the viscosity of the chemical solution can be lowered and the chemical solution can be applied to the sheet body 10 more easily than with a paper product 1 constructed by applying only a moisturizing chemical solution to the sheet body 10. This reduces the effort and cost of heating the chemical solution in the manufacturing method described below, and makes it possible to improve the manufacturability of the paper product 1.

(Configuration - Container)
Next, a description will be given of the configuration of the container 20. The container 20 is for containing the paper products 1, and includes a container body 21, an outlet 22, and a lid 23, as shown in FIG.

(Configuration-Housing-Housing Body)
The container body 21 is the basic structure of the container 20. The container body 21 is formed of a hollow body made of, for example, paper (or resin), and specifically, is formed in a rectangular parallelepiped shape as shown in Fig. 1. However, the container body 21 is not limited to this, and may be formed in, for example, a cylindrical body, a spherical body, or the like.

The specific size of the container body 21 can be any size as long as it can accommodate multiple paper products 1, but in this embodiment, it is set as follows. That is, the left-right length of the container body 21 is set to be longer than the left-right length of the paper products 1, and the front-to-back length of the container body 21 is set to be longer than the front-to-back length of the paper products 1. The vertical length of the container body 21 is set to be longer than the vertical height of the paper products 1 multiplied by the number of paper products 1 accommodated in the container 20.

(Configuration-Container-Extraction Port)
The outlet 22 is an opening for removing the paper products 1 contained in the container body 21. The outlet 22 is formed, for example, in a rectangular shape (or a circular or elliptical shape) and is provided on the top surface of the container body 21 as shown in FIG.

(Configuration-Container-Lid)
The lid portion 23 is for sealing the outlet 22. The lid portion 23 is formed using a part of the container body 21, specifically, the lid portion 23 is formed by processing the part of the container body 21 corresponding to the outlet 22 by a predetermined processing method (perforation processing is one example).

With this type of container 20, when the outlet 22 is closed by the lid 23, the paper products 1 can be stored while maintaining their quality, and when the outlet 22 is open by the lid 23, the paper products 1 can be easily removed from the container body 21 through the outlet 22.

(Manufacturing method of paper products)
Next, a method for manufacturing the paper product 1 will be described. Fig. 2 is a diagram showing a lamination step of the manufacturing method according to the embodiment. Fig. 3 is a diagram showing a forming step and a packaging step of the manufacturing method according to the embodiment. The manufacturing method according to the embodiment includes a lamination step, a viscosity adjustment step, a coating step, a forming step, and a packaging step.

(Paper product manufacturing method-lamination process)
First, the lamination process will be described. The lamination process is a process for integrating two sheet bodies 10 into a laminated state.

Specifically, as shown in FIG. 2, an operator first sets two rolled sheet bodies 11 on a known winding device 30 (a so-called winder). Next, a control unit (not shown) of the winding device 30 causes the roller unit 31 to unwind and stack the sheet bodies 11, and the stacked body is subjected to a calendaring process in the calendaring unit 32 (a process in which pressure is applied to the stacked body to adjust the thickness of the sheet body 11 and improve its smoothness). The sheet body 11 that has been subjected to the calendaring process is then wound into a roll to form the rolled sheet body 12.

(Paper product manufacturing method - viscosity adjustment process)
Next, the viscosity adjustment step will be described. The viscosity adjustment step is a step of adjusting the viscosity of the chemicals (the moisturizing chemicals and the chemicals containing cellulose nanofibers) by stirring the chemicals after the lamination step (or before or at the same time).

Specifically, a known stirring device is used to stir the liquid medicine contained in a container (not shown) at a predetermined rotation speed (e.g., 10 rpm to 100 rpm) for a predetermined time.

As shown in the test results described below, this viscosity adjustment process allows the viscosity of the chemical solution to be reduced due to the thixotropy of cellulose nanofibers (the property of decreasing viscosity when force is applied), making it possible to adjust the viscosity of the chemical solution to meet the needs of the user. In addition, the viscosity of the chemical solution can be easily adjusted using relatively simple equipment, making it possible to maintain the manufacturability of the paper product 1.

(Paper product manufacturing method-coating process)
Next, the coating process will be described. The coating process is a process of coating a chemical solution after the lamination process and the viscosity adjustment process.

Specifically, first, an operator sets the roll-shaped sheet body 12 formed in the lamination process from the winding device 30 to a known coating device (e.g., a gravure printing machine, an offset printing machine, a spray type device, a rotor dampening device, etc.) (not shown). Next, the control unit of the coating device uses a known coating method (e.g., a gravure printing method, an offset printing method, a spray type method, a rotor dampening method) to apply the chemical solution from the coating unit while unwinding the roll-shaped sheet body 12. More specifically, the coating is performed so that the amount of the chemical solution applied to each layer of the roll-shaped sheet body 12 is 10% by weight to 30% by weight. Next, the sheet body 10 to which the chemical solution has been applied is wound into a roll to form the roll-shaped sheet body 13. Thereafter, an operator removes the roll-shaped sheet body 13 from the coating device and leaves the sheet body 13 for a predetermined time (e.g., leaves the sheet body 13 in a stationary or moving state), thereby allowing the chemical solution to penetrate the sheet body 13.

For example, in the coating process, if the remaining chemical solution applied by the coating device described below is reused, a removal process may be carried out to remove impurities such as paper powder contained in the remaining chemical solution using a known filtering means (e.g., a mesh material). This allows the quality of the chemical solution to be maintained when the reused chemical solution is used in the coating process, and the quality of the paper product 1 can be ensured while reducing the amount of chemical solution used.

(Paper product manufacturing method - forming process)
Next, the forming step will be described. The forming step is a step of forming the paper product 1 after the coating step.

Specifically, as shown in FIG. 3, a worker first sets two of the rolled sheet bodies 13 in a known folding device 40 (e.g., a rotary interfolder, a multi-stand interfolder, etc.). Next, a control unit (not shown) of the folding device 40 causes the folding unit 41 and roller unit 44 to fold the rolled sheet body 13 while unwinding it (e.g., folding it in a V-shape or Z-shape), and then a cutting unit (not shown) cuts the folded pieces to a predetermined size. The folding unit 41 then alternately stacks the cut pieces while overlapping them so that the paper product 1 can be removed from the container 20 in a pop-up manner.

(Paper product manufacturing method - packaging process)
Next, the packaging process will be described. The packaging process is a process of packaging the paper product 1 formed in the forming process in a container 20 after the forming process.

Specifically, as shown in FIG. 3, first, the control unit of the folding device 40 causes the conveying unit 42 to convey the paper product 1 formed in the forming process to the position of the container 20. In this case, the pressing unit 43 may press the paper product 1 to reduce the bulk of the paper product 1, making it easier to accommodate the paper product 1 in the container 20. Next, the packaging unit (not shown) accommodates the paper product 1 in the container 20.

By using the above-described method for manufacturing the paper product 1, the viscosity of the chemical solution can be lowered and the chemical solution can be applied to the sheet body 10 more easily than when only a moisturizing chemical solution is applied to the sheet body 10 in the application process. This reduces the effort and cost of heating the chemical solution in the manufacturing method, and improves the manufacturability of the paper product 1. In addition, the amount of chemical solution applied to each layer of the sheet body 10 in the application process is set to 10% to 30% by weight, so that tissue paper with moisturizing properties can be reliably manufactured, and the manufacturability of the tissue paper can be improved.

(Test results)
Next, the results of various tests conducted by the applicant of the present invention will be described. The following describes the first viscosity confirmation test, the second viscosity confirmation test, the paper quality confirmation test, and the sensory test conducted to confirm the effects of the chemical solution according to the present invention.

(Test results - Overview of the first viscosity confirmation test)
First, an overview of the first viscosity confirmation test will be described. Here, the "first viscosity confirmation test" is a test for confirming the viscosity of various chemical liquids at a predetermined temperature.

The first viscosity confirmation test is performed by adjusting the temperature of various chemical solutions contained in designated containers to a set temperature (specifically, 3°C, 25°C, 40°C, and 60°C) using a known thermostatic bath, and measuring the viscosity of the adjusted chemical solutions using a known viscometer (specifically, a Brookfield viscometer).

The chemical solutions used in the first viscosity confirmation test are divided into the first to fifth chemical solutions. The first chemical solution is a moisturizing chemical solution according to the embodiment (specifically, a moisturizing chemical solution made of Neosofter MKN-3Y). The second chemical solution contains the moisturizing chemical solution according to the embodiment and the cellulose nanofiber according to the embodiment, and is blended so that the content of the cellulose nanofiber in the moisturizing chemical solution is 0.03%. The third chemical solution contains the moisturizing chemical solution according to the embodiment and the cellulose nanofiber according to the embodiment, and is blended so that the content of the cellulose nanofiber in the moisturizing chemical solution is 0.06%. The fourth chemical solution contains the moisturizing chemical solution according to the embodiment and the cellulose nanofiber according to the embodiment, and is blended so that the content of the cellulose nanofiber in the moisturizing chemical solution is 0.15%. The fifth chemical solution contains the moisturizing chemical solution according to the above embodiment and the cellulose nanofiber according to the above embodiment, and is formulated so that the content of the cellulose nanofiber in the moisturizing chemical solution is 0.30%.

(Test Results - Test Results of First Viscosity Confirmation Test)
Next, the test results of the first viscosity confirmation test will be described. Fig. 4 is a diagram showing the test results of the first viscosity confirmation test.

As shown in Figure 4, the viscosity of the first to fifth chemical liquids decreased as the temperature increased. Furthermore, the viscosity of the second to fifth chemical liquids when the adjustment temperature was 3°C was lower than the viscosity of the first chemical liquid when the adjustment temperature was 3°C. In particular, the viscosity of the fourth and fifth chemical liquids when the adjustment temperature was 3°C was about 1/4 of the viscosity of the first chemical liquid when the adjustment temperature was 3°C.

The test results shown in Figure 4 confirm that the viscosity of the chemical solution according to the embodiment can be reduced even when the temperature of the chemical solution is relatively low. It was also confirmed that the viscosity of the chemical solution can be reduced by increasing the content of cellulose nanofiber in the moisturizing chemical solution.

(Test results - Overview of the second viscosity confirmation test)
Next, an overview of the second viscosity confirmation test will be described. Here, the "second viscosity confirmation test" is a test for confirming the viscosity of various chemical solutions when stirred at a predetermined rotation speed.

The second viscosity confirmation test is performed by stirring various chemical solutions adjusted to a predetermined temperature (specifically, 25°C) using a known thermostatic bath at a predetermined rotation speed (specifically, 10 rpm, 30 rpm, 50 rpm, 100 rpm) using a known stirring device, and measuring the viscosity of the stirred chemical solutions using a known viscometer (specifically, a B-type viscometer).

The chemical solutions used in the second viscosity confirmation test are divided into the second and third chemical solutions used in the first viscosity confirmation test, and the sixth chemical solution. Of these, the sixth chemical solution contains the moisturizing chemical solution according to the above embodiment and the cellulose nanofiber according to the embodiment, and is formulated so that the content of the cellulose nanofiber in the moisturizing chemical solution is 0.12%.

(Test Results - Test Results of Second Viscosity Confirmation Test)
Next, the test results of the second viscosity confirmation test will be described. Fig. 5 is a diagram showing the test results of the second viscosity confirmation test.

As shown in Figure 5, the viscosity of the second, third, and sixth chemical solutions decreased as the rotation speed of the stirring device increased. In addition, the viscosity of the second, third, and sixth chemical solutions increased as the content of cellulose nanofibers in the moisturizing chemical solutions increased.

The test results shown in Figure 5 confirm that the viscosity of the liquid medicine according to the embodiment can be reduced by stirring the liquid medicine. It was also confirmed that the viscosity of the liquid medicine according to the embodiment can be increased by increasing the content of cellulose nanofiber in the moisturizing liquid medicine.

(Test results - Overview of paper quality confirmation test)
Next, an overview of the paper quality confirmation test will be described. Here, the "paper quality confirmation test" is a test for quantitatively confirming the paper quality of various test specimens.

The method for this paper quality confirmation test involves using a known friction measuring device to measure the friction coefficient (specifically, the friction coefficient in the machine direction (long axis direction) and the friction coefficient in the width direction (short axis direction)) of each type of test specimen multiple times, and using a known softness measuring device to measure the softness (specifically, the softness in the longitudinal direction (long axis direction) and the softness in the transverse direction (short axis direction)) of each type of test specimen.

The test specimens used in the paper quality confirmation test are divided into first to third paper quality test specimens. Of these, the first paper quality test specimen is a sheet body 10 (basis weight 13.5 g/m ² ) according to the embodiment to which the chemical solution according to the embodiment has not been applied. The second paper quality test specimen is a sheet body 10 according to the embodiment to which the moisturizing chemical solution according to the embodiment has been applied in an amount of 2.0 g/m ^2. The third paper quality test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment (specifically, a chemical solution in which the content of cellulose nanofiber in the moisturizing chemical solution is 0.03%) has been applied in an amount of 2.0 g/m ² .

(Test results - Paper quality verification test results)
Next, the results of the paper quality confirmation test will be described with reference to FIG.

As shown in Figure 6, the average coefficient of friction of the third paper quality specimen was higher than the average coefficients of friction of the first and second paper quality specimens. In addition, the average deviation of the coefficient of friction of the third paper quality specimen was similar to the average deviation of the coefficient of friction of the first paper quality specimen, but was lower than the average deviation of the coefficient of friction of the second paper quality specimen. In addition, the softness of the third paper quality specimen was lower than the softness of the first and second paper quality specimens.

The test results shown in Figure 6 confirm that the softness of the paper product 1 can be increased by using the chemical solution according to the embodiment.

(Test results - summary of sensory test)
Next, an overview of the sensory test will be described. Here, the sensory test is a test for confirming the paper quality of various test specimens by human senses.

The sensory test is conducted by having a person grasp various test specimens and evaluate their softness based on predetermined evaluation criteria (specifically, "soft," "slightly soft," "normal," "slightly hard," and "hard").

The test specimens used in the sensory test are divided into the first sensory test specimen to the seventh sensory test specimen. Of these, the first sensory test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment has not been applied. The second sensory test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment (specifically, a chemical solution in which the content of cellulose nanofiber in the moisturizing chemical solution is 0.06%) has been applied. The third sensory test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment (specifically, a chemical solution in which the content of cellulose nanofiber in the moisturizing chemical solution is 0.15%) has been applied. The fourth sensory test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment (specifically, a chemical solution in which the content of cellulose nanofiber in the moisturizing chemical solution is 0.24%) has been applied. The fifth sensory test specimen is a sheet body 10 according to the embodiment to which the chemical solution according to the embodiment (specifically, a chemical solution in which the content of cellulose nanofiber in the moisturizing chemical solution is 0.30%) has been applied. The sixth sensory test specimen is a sheet body 10 according to the embodiment to which the moisturizing liquid according to the embodiment has been applied, and the amount of the moisturizing liquid applied is relatively large. The seventh sensory test specimen is a sheet body 10 according to the embodiment to which the moisturizing liquid according to the embodiment has been applied, and the amount of the moisturizing liquid applied is relatively small.

(Test Results - Sensory Test Results)
Next, the results of the sensory test will be described with reference to FIG.

As shown in Figure 7, the evaluations of the second and third sensory test specimens (specifically, evaluations of softness) were lower than the evaluation of the sixth sensory test specimen, but higher than the evaluation of the first sensory test specimen. The evaluation of the second sensory test specimen was also higher than the evaluation of the third sensory test specimen. On the other hand, the evaluations of the fourth and fifth sensory test specimens were lower than the evaluations of the second and third sensory test specimens, and were almost the same as the evaluation of the first sensory test specimen.

The test results shown in Figure 7 confirm that the softness of the paper product 1 can be ensured by setting the cellulose nanofiber content in the moisturizing solution to 0.15% or less, and that it is particularly effective to set the content to 0.06% or less.

The results of the first viscosity confirmation test, paper quality confirmation test, and sensory test confirmed the effectiveness of the chemical solution containing a moisturizing chemical solution and cellulose nanofiber, as well as the effectiveness of setting the cellulose nanofiber content in the moisturizing chemical solution to 0.03% or more and 0.15% or less. The results of the second viscosity confirmation test also confirmed the effectiveness of carrying out a viscosity adjustment process.

(effect)
Thus, according to the embodiment, the method includes a coating step of coating the sheet body 10 with a chemical solution, and the chemical solution contains a moisturizing chemical solution having moisturizing properties and cellulose nanofibers, so that the viscosity of the chemical solution can be lowered and the chemical solution can be more easily applied to the sheet body 10 compared to a case where only a moisturizing chemical solution is applied to the sheet body 10 in the coating step. Therefore, the labor and cost of heating the chemical solution in the manufacturing method can be reduced, and the manufacturability of the paper product 1 can be improved.

In addition, since the content of cellulose nanofiber in the moisturizing liquid is 0.03% or more and 0.15% or less, the viscosity of the liquid can be reduced while the paper product 1 is formed relatively soft, compared to when the content of cellulose nanofiber in the moisturizing liquid exceeds 0.15%, and the flexibility of the paper product 1 can be increased while maintaining the manufacturability of the paper product 1.

In addition, since the content of cellulose nanofiber in the moisturizing liquid is 0.06% or less, the viscosity of the liquid can be lowered and the paper product 1 can be formed relatively softly while reducing the amount of cellulose nanofiber added, compared to when the content of cellulose nanofiber in the moisturizing liquid exceeds 0.06%, which further improves the manufacturability of the paper product 1.

In addition, because the cellulose nanofibers are formed from citrus peels, they can be produced relatively inexpensively, reducing the manufacturing costs of the paper product 1. In addition, chemical reactions that would impair the quality of the moisturizing chemical solution can be avoided, making it easier to maintain the quality of the chemical solution.

In addition, the method further includes a viscosity adjustment process that is carried out before the application process, in which the viscosity of the chemical solution is adjusted by stirring the chemical solution. This allows the viscosity of the chemical solution to be reduced by the thixotropic properties of the cellulose nanofiber, making it possible to adjust the viscosity of the chemical solution according to the needs of the user. In addition, the viscosity of the chemical solution can be easily adjusted using relatively simple equipment, making it possible to maintain the manufacturability of the paper product 1.

The paper product 1 is a tissue paper made by laminating multiple sheets 10, and the amount of chemical solution applied to each layer of the sheet 10 in the application process is set to 10% to 30% by weight, so that moisturizing tissue paper can be reliably manufactured, and the manufacturability of the tissue paper can be improved.

[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 paper products)
In the above embodiment, the paper product 1 is described as tissue paper made of two laminated sheet bodies 10, but is not limited to this. For example, the tissue paper may be made of only one layer of sheet body 10, or may be made of three or more laminated sheet bodies 10. If the paper product 1 is tissue paper made of only one layer of sheet body 10, the lamination step in the manufacturing method can be omitted.

In the above embodiment, the paper products 1 are stored in the container 20 in a state in which multiple paper products 1 are arranged in a stacked manner in the vertical direction, but this is not limited to the above. For example, the paper products 1 may be stored in a state in which multiple paper products 1 are arranged in a stacked manner in the front-back or left-right direction. Alternatively, the paper products 1 may be stored in a state in which multiple paper products 1 are arranged in a non-stacked manner, or only one paper product 1 may be stored.

(About moisturizing liquids)
In the above embodiment, the moisturizing liquid chemical is described as being composed of polyhydric alcohol and water, but is not limited thereto. For example, the moisturizing liquid chemical may be composed of a so-called "moisturizing softening liquid chemical" by including a known softening agent (for example, a softening agent containing a cationic polyethylene emulsion, an anionic surfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant) in addition to the above components. Alternatively, the moisturizing liquid chemical may be composed of a known auxiliary agent in addition to the above components. Here, the specific type of the "auxiliary agent" is arbitrary, and may be, for example, an auxiliary agent for increasing the water retention in the paper product 1 (for example, sugars, glycol-based drugs and their derivatives, hydrophilic polymers, polymeric water retention agents, amino acids, etc.), an auxiliary agent for assisting in the development of smoothness (for example, oily components such as liquid paraffin and higher alcohols, etc.), or an auxiliary agent for stabilizing the moisturizing liquid chemical and improving the applicability (for example, emulsifiers, preservatives, defoamers, etc.).

(Regarding the manufacturing method)
In the above embodiment, some of the work in each step of the manufacturing method is performed using the winding device 30, the coating device, and the folding device 40. However, the present invention is not limited to this and may be performed by a person, for example.

In addition, in the above embodiment, the manufacturing method is described as including a viscosity adjustment process, but is not limited to this, and for example, the viscosity adjustment process may be omitted.

In the above embodiment, the application process is performed before the formation process, but this is not limited to the above. For example, the application process may be performed simultaneously with the formation process. As an example, first, an operator sets the sheet body 10 that has been subjected to the above calendaring process from the winding device 30 to the folding device 40. Next, the control unit of the folding device 40 causes the roll-shaped sheet body 10 to which the chemical solution has been applied in the folding unit 41 to be folded while being unwound. Next, the application unit provided in the folding device 40 applies the chemical solution to the folded piece, and then the cutting unit cuts the piece to which the chemical solution has been applied to a predetermined size. Then, the cut pieces are stacked alternately while overlapping each other in the folding unit 41.

(Additional Note)
The method for manufacturing a paper product in Appendix 1 is a method for manufacturing a paper product consisting of at least one paper sheet body, and includes a coating process for applying a chemical solution to the sheet body, the chemical solution including a moisturizing chemical solution having moisturizing properties and cellulose nanofibers.

The method for producing a paper product in Appendix 2 is the method for producing a paper product in Appendix 1, in which the content of the cellulose nanofibers in the moisturizing solution is 0.03% or more and 0.15% or less.

The method for producing a paper product in Appendix 3 is the method for producing a paper product in Appendix 2, in which the content of the cellulose nanofibers in the moisturizing solution is 0.06% or less.

The method for producing a paper product in Appendix 4 is the method for producing a paper product in any one of Appendixes 1 to 3, in which the cellulose nanofibers are formed from citrus peel.

The method for producing a paper product according to appendix 5 is the method for producing a paper product according to any one of appendices 1 to 4, and further includes a viscosity adjustment step carried out before the application step, in which the viscosity of the chemical solution is adjusted by stirring the chemical solution.

The method for manufacturing a paper product in Appendix 6 is the method for manufacturing a paper product in any one of Appendixes 1 to 5, in which the paper product is a tissue paper made by laminating a plurality of the sheet bodies, and the amount of the chemical solution applied to each layer of the sheet body in the application step is 10% by weight to 30% by weight.

The paper product of Appendix 7 is a paper product manufactured using the manufacturing method described in any one of Appendixes 1 to 6.

(Effect of supplementary notes)
The method for manufacturing a paper product described in Appendix 1 and the paper product described in Appendix 7 include a coating step in which a chemical solution is applied to a sheet body, and since the chemical solution contains a moisturizing chemical solution having moisturizing properties and cellulose nanofibers, the viscosity of the chemical solution can be lowered and the chemical solution can be applied to the sheet body more easily than when only a moisturizing chemical solution is applied to the sheet body in the coating step. Therefore, the labor and cost of heating the chemical solution in the manufacturing method can be reduced, and the manufacturability of the paper product can be improved.

According to the method for producing paper products described in Appendix 2, the content of cellulose nanofibers in the moisturizing liquid is 0.03% or more and 0.15% or less, so that the viscosity of the liquid can be reduced while forming a relatively soft paper product compared to when the content of cellulose nanofibers in the moisturizing liquid exceeds 0.15%, and the flexibility of the paper product can be increased while maintaining the manufacturability of the paper product.

According to the method for producing paper products described in Appendix 3, the content of cellulose nanofiber in the moisturizing chemical solution is 0.06% or less, so compared to when the content of cellulose nanofiber in the moisturizing chemical solution exceeds 0.06%, the viscosity of the chemical solution can be lowered while reducing the amount of cellulose nanofiber added, and a relatively soft paper product can be formed, further improving the manufacturability of the paper product.

According to the method for producing paper products described in Appendix 4, cellulose nanofibers are formed from citrus peels, so that the cellulose nanofibers can be produced relatively inexpensively, reducing the production costs of paper products. In addition, chemical reactions that would impair the quality of the moisturizing chemical solution can be avoided, making it easier to maintain the quality of the chemical solution.

According to the method for manufacturing paper products described in Appendix 5, the viscosity adjustment step performed before the application step further includes a viscosity adjustment step of adjusting the viscosity of the chemical solution by stirring the chemical solution, so that the viscosity of the chemical solution can be reduced by the thixotropy of cellulose nanofiber (the property of decreasing viscosity when force is applied), and it becomes possible to adjust the viscosity of the chemical solution according to the needs of the user. In addition, the viscosity of the chemical solution can be easily adjusted using relatively simple equipment, making it possible to maintain the manufacturability of paper products.

According to the method for manufacturing a paper product described in Appendix 6, the paper product is a tissue paper made of multiple laminated sheets, and the amount of chemical solution applied to each layer of the sheet in the application process is set to 10% to 30% by weight, so that moisturizing tissue paper can be reliably manufactured, and the manufacturability of the tissue paper can be improved.

REFERENCE SIGNS LIST 1 Paper product 10 Sheet body 11 Roll-shaped sheet body 12 Roll-shaped sheet body 13 Roll-shaped sheet body 20 Container 21 Container body main body 22 Discharge port 23 Lid section 30 Winding device 31 Roller section 32 Calender section 40 Folding device 41 Folding section 42 Conveying section 43 Pressing section 44 Roller section

Claims (6)

A method for producing a paper product comprising at least one paper sheet body, comprising the steps of:
A coating step of coating the sheet body with a chemical solution is included,
The chemical solution contains a moisturizing chemical solution having moisturizing properties and cellulose nanofibers,
The content of the cellulose nanofiber in the moisturizing liquid is 0.03% or more and 0.15% or less.
A method for manufacturing paper products. The content of the cellulose nanofiber in the moisturizing liquid is 0.06% or less.
A method for producing the paper product according to claim 1. The cellulose nanofibers are formed from citrus peels.
A method for producing a paper product according to claim 1 or 2 . The viscosity adjusting step is performed before the application step, and further includes a viscosity adjusting step of adjusting the viscosity of the chemical solution by stirring the chemical solution.
A method for producing a paper product according to any one of claims 1 to 3. The paper product is tissue paper formed by laminating a plurality of the sheet bodies,
The amount of the chemical solution applied per layer of the sheet body in the application step is set to 10% by weight to 30% by weight.
A method for producing a paper product according to any one of claims 1 to 4. A paper product consisting of at least one paper sheet body,
The sheet body to which a chemical solution is applied is included,
The chemical solution contains a moisturizing chemical solution having moisturizing properties and cellulose nanofibers,
The content of the cellulose nanofiber in the moisturizing liquid is 0.03% or more and 0.15% or less.
Paper products .

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