Pulpwood for making paper, material for making paper, and production method of japanese paper

Abstract

To provide pulpwood for making paper that is easy to store and transport.SOLUTION: Pulpwood for making paper 2 of the present disclosure comprises pulp and water. The pulpwood for making paper comes in sheets.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a pulp material for papermaking, a material for papermaking, and a method for producing Japanese paper. [Background technology]

[0002] In the production of Japanese paper, for example, pulp extracted from plant materials is dispersed in water to form a raw material liquid, from which the paper is made. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-162211 Summary of the Invention [Problem to be solved by the invention]

[0004] The raw material liquid in which pulp, the raw material for Japanese paper, is dispersed in water is not easy to transport, and if stored as is, silica precipitation from the pulp and mold growth are likely to occur, making it difficult to maintain the quality of Japanese paper produced from pulp.

[0005] An object of the present disclosure is to provide a papermaking pulp material that is easy to store and transport, a papermaking material that includes this papermaking pulp material, and a method for producing Japanese paper that uses this papermaking pulp material. [Means for solving the problem]

[0006] A pulp material for papermaking according to one embodiment of the present disclosure contains pulp and water and is in a sheet form.

[0007] A papermaking material according to one aspect of the present disclosure includes the papermaking pulp material and an alkaline storage liquid, wherein the papermaking pulp material is immersed in the storage liquid.

[0008] A method for producing Japanese paper according to one embodiment of the present disclosure includes dispersing the pulp material for papermaking in water to prepare a raw material liquid, and producing Japanese paper from the raw material liquid. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a papermaking pulp material that is easy to store and transport, a papermaking material including this papermaking pulp material, and a method for producing Japanese paper using this papermaking pulp material. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic cross-sectional view of a paper-making pulp material and a paper-making material according to one embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view of Japanese paper according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1. Embodiment Hereinafter, embodiments of the present disclosure will be described. Note that the present disclosure is not limited to the following embodiments. The following embodiments are merely a part of various embodiments of the present disclosure, and various modifications are possible depending on the design as long as the object of the present disclosure can be achieved.

[0012] The papermaking pulp material 2 (papermaking pulp sheet) of the embodiment is used to make Japanese paper 5. That is, the papermaking pulp material 2 is a raw material for Japanese paper 5. The papermaking pulp material 2 contains pulp and water and is in a sheet form.

[0013] This makes it easy to store and transport this papermaking pulp material 2. This papermaking pulp material 2 can be dispersed in water to prepare a raw material liquid, and Japanese paper 5 can be made from this raw material liquid. This allows the quality of the Japanese paper 5 to be maintained, for example, when the Japanese paper 5 is made a long time after the papermaking pulp material 2 is made, when the place where the papermaking pulp material 2 is made is far from the place where the Japanese paper 5 is made from the papermaking pulp material 2, or when the Japanese paper 5 is made in multiple places after the papermaking pulp material 2 is made.

[0014] The method for producing the papermaking pulp material 2 includes, for example, the following preparation step, beating step, removal step, and sheet forming step.

[0015] In the preparation step, plant raw materials are prepared. The plant raw materials include, for example, barley. That is, the pulp in the papermaking pulp material 2 includes, for example, pulp derived from barley. Specifically, for example, barley straw is prepared as the plant raw material. Note that the plant raw material may include materials other than barley. For example, the plant raw material includes at least one species selected from the group consisting of barley, paper mulberry, Mitsumata, gampi, hemp, Choma, flax, Manila hemp, Kouma, and bamboo. That is, the pulp in the papermaking pulp material 2 includes pulp derived from at least one species selected from the group consisting of, for example, barley, paper mulberry, Mitsumata, gampi, hemp, Choma, flax, Manila hemp, Kouma, and bamboo. When the pulp in the papermaking pulp material 2 contains barley-derived pulp, the proportion of the barley-derived pulp in the total pulp in the papermaking pulp material 2 is, for example, 10% by mass or more and 100% by mass or less.

[0016] Next, in the extraction process, pulp is extracted from the plant material. For example, the plant material and a sodium hydroxide solution with a pH of 8 to 9 are placed in a container such as a pressure cooker. For example, for 20 kg of plant material, a sodium hydroxide solution prepared by mixing 6 kg of sodium hydroxide in 320 L of water is used. The container is heated in this state to bring the sodium hydroxide solution to a boil. The sodium hydroxide solution is maintained in a boiling state for, for example, 3 hours. The time for maintaining the sodium hydroxide solution in a boiling state is not limited to the above. This separates the plant material into pulp, oil, lignin, etc. Next, the lye is removed. Specifically, for example, water is gradually added to the container while the liquid in the container is gradually drained. This removes the oil, lignin, etc. from the container, leaving the pulp in the container. This extracts the pulp from the plant material.

[0017] Next, in the beating process, the pulp is loosened. The pulp can be loosened by beating, but other methods may be used as long as they can loosen the pulp. Specifically, the pulp can be loosened by shearing with a beater such as a naginata beater or a Hollander beater.

[0018] Next, if necessary, foreign matter and coarse matter are removed from the pulp in a removal process. Coarse matter includes, for example, relatively large fibers that were not sufficiently loosened in the beating process. For example, the pulp is dispersed in water to prepare an aqueous dispersion, and this aqueous dispersion is passed through a screen with multiple slit holes. The width of the slit holes is, for example, 10 μm and the length is 10 cm, but this is not limited to these. This allows the screen to remove foreign matter and coarse matter that are mixed in the pulp.

[0019] The coarse matter may include relatively large fibers that were not sufficiently disintegrated in the beating process. The relatively large fibers removed from the pulp in the removal process may be mixed back into the pulp. In this case, as will be described later, an irregular fiber pattern 6 may be imparted to the washi paper 5.

[0020] Next, if necessary, the pulp is bleached, for example, by immersing the pulp in an aqueous solution of sodium hypochlorite for two hours.

[0021] Next, in the sheet-forming process, a dispersion containing pulp and water is prepared and formed into a sheet to produce the papermaking pulp material 2. The dispersion contains, for example, 2 L to 20 L of water per 1 kg of pulp. The dispersion is formed into a sheet, and the water content is adjusted as necessary to produce the sheet-shaped papermaking pulp material 2 containing pulp and water. To form the dispersion into a sheet, a papermaking machine such as a cylinder papermaking machine can be used. In this case, the dispersion is formed into a sheet using a papermaking machine or the like to produce the papermaking pulp material 2, and then the papermaking pulp material 2 is removed from the papermaking machine without being subjected to pressing or drying, thereby obtaining the papermaking pulp material 2. The proportion of water in the papermaking pulp material 2 is, for example, 10% by mass to 80% by mass. The thickness of the papermaking pulp material 2 is, for example, 0.05 mm to 3 mm. The thickness of the papermaking pulp material 2 may be 0.01 mm or more.

[0022] By placing the papermaking pulp material 2 and the storage liquid 3 in an appropriate storage container 4 and immersing the papermaking pulp material 2 in the storage liquid 3, a papermaking material 1 comprising the papermaking pulp material 2 and the storage liquid 3 is obtained, as shown in FIG. 1. The storage liquid 3 is alkaline. For example, the storage liquid 3 is an aqueous solution of sodium hydroxide. The pH of the storage liquid 3 is preferably 10 or higher. Immersing the papermaking pulp material 2 in the storage liquid 3 inhibits the precipitation of silica from the papermaking pulp material 2 and inhibits the growth of mold on the papermaking pulp material 2. This allows the quality of the Japanese paper 5 produced from the papermaking pulp material 2 to be maintained after storage.

[0023] When storing the papermaking material 1, it is preferable to maintain the temperature of the papermaking material 1 at 6°C or below. That is, it is preferable that the temperature of the storage liquid 3 in the papermaking material 1 during storage be 6°C or below. In this case, the precipitation of silica from the papermaking pulp material 2 is suppressed, and the growth of mold on the papermaking pulp material 2 is also suppressed. Therefore, the quality of the Japanese paper 5 produced using the papermaking pulp material 2 after storage can be maintained.

[0024] In fact, papermaking pulp material 2 was produced by the above method using barley straw produced in the Echizen region of Japan as the plant raw material, and when papermaking material 1 comprising this papermaking pulp material 2 and storage solution 3 (aqueous sodium hydroxide solution) of pH 10 was stored at a temperature of 4°C for one week, no silica precipitation or mold growth was observed.

[0025] When producing Japanese paper 5, part or all of the papermaking pulp material 2 in the papermaking material 1 is removed and dispersed in water to prepare a raw material solution. In this case, the raw material solution can be prepared using only part of the papermaking pulp material 2. Appropriate additives can be further added to the raw material solution as needed.

[0026] Washi paper 5 can be made from this raw material liquid. The production of washi paper 5 can be carried out by a common method. For example, the raw material liquid is strained to produce a sheet containing moisture, and the moisture is removed from the sheet by squeezing or the like, and then the sheet is dried to produce washi paper 5. If the papermaking pulp material 2 contains relatively large fibers that were once removed from the pulp in the removal process, the washi paper 5 can be given an irregular pattern 6 due to the fibers, as shown in Figure 2.

[0027] The Japanese paper 5 in this embodiment can be used for a variety of purposes, including, but not limited to, product labels, wrapping paper, and art supplies for oil paintings and woodblock prints.

[0028] 2. Aspects As is apparent from the above embodiments, the present disclosure includes the following aspects.

[0029] The pulp material (2) for papermaking of the first embodiment contains pulp and water and is in the form of a sheet.

[0030] According to this embodiment, the pulp material (2) for paper making can be easily stored and transported.

[0031] In a second embodiment, the pulp in the first embodiment contains pulp derived from barley.

[0032] In a third embodiment, the pulp material (2) for papermaking in the first or second embodiment is used for making Japanese paper.

[0033] A papermaking material (1) of a fourth aspect includes the papermaking pulp material (2) of any one of the first to third aspects and an alkaline storage liquid (3). The papermaking pulp material (2) is immersed in the storage liquid (3).

[0034] The method for producing Japanese paper (5) of the fifth aspect includes dispersing the papermaking pulp material (2) of the first to fourth aspects in water to prepare a raw material liquid, and producing Japanese paper (5) from the raw material liquid.

[0035] The sixth embodiment of the method for producing Japanese paper (5) includes extracting pulp from a plant raw material, beating the pulp, forming a dispersion containing the pulp and water into a sheet to produce a pulp material (2) for papermaking, immersing the pulp material (2) for papermaking in an alkaline storage liquid (3), dispersing the pulp material (2) for papermaking in water to prepare a raw material liquid, and producing Japanese paper (5) from the raw material liquid. [Explanation of symbols]

[0036] 1 Materials for papermaking 2 Pulp wood for papermaking 3 Storage solution 5. Washi paper

Claims

1. A pulp material for papermaking that contains pulp and water and is in sheet form.

2. The pulp contains pulp derived from barley. The pulp material for papermaking according to claim 1.

3. It is used for making Japanese paper. The pulp material for papermaking according to claim 1.

4. The pulp material for papermaking according to claim 1; an alkaline storage solution; The pulp material for papermaking is immersed in the storage liquid. Materials for papermaking.

5. A raw material liquid is prepared by dispersing the pulp material for papermaking according to claim 1 in water, Japanese paper is produced from the raw material liquid. How washi paper is made.

6. Extracting pulp from plant material; beating the pulp; forming the dispersion containing the pulp and water into a sheet to produce a pulp material for papermaking; Immersing the papermaking pulp material in an alkaline storage solution; Dispersing the pulp material for papermaking in water to prepare a raw material solution; producing Japanese paper from the raw material liquid; A method for producing Japanese paper, comprising:

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