JP2022020444A - Japanese paper yarn made of conifer and manufacturing method thereof and japanese paper fabric using the same - Google Patents

Abstract

To provide a yarn having uniform quality of Japanese paper fiber even if conifer to be raw material is uneven, a uniform and stable Japanese paper yarn having an excellent tension strength required for a product produced by weaving the yarn, and a Japanese paper fabric.SOLUTION: A manufacturing method of a Japanese paper yarn JY comprises: a measurement step 10 to measure absolute dry weight of conifer chips CT to be raw material; an immersion step 30 to immerse the conifer chips CT and a medical agent NO of an amount calculated based on the measurement result for a predetermined time in water HO of an amount calculated based on the measurement result; a digestion step 40 to digest the immersed conifer chips CT, the medical agent NO, and the water HO; a papermaking step 50 to mill a paper by mixing a cellulose CL extracted from the conifer chips CT at the digestion step 40 and Manila hemp MH; a slit step 60 to slit a Japanese paper JP milled at the papermaking step 50; and a yarn twisting step to twist the Japanese paper JP slit at the slit step 60 to form a Japanese paper yarn JY.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coniferous tree, particularly a Japanese paper thread made from domestic coniferous trees and thinned wood thereof, a method for producing the same, and a Japanese paper woven fabric using the same.

Conventionally, for example, as a paper thread using Manila hemp and sugar cane pomace as a part of raw materials and a method for producing the same, for example, a paper thread as shown in Patent No. 6570101 (Patent Document 1) and a method for producing the same are known. be. In the method for producing paper yarn described in the publication, a removal step of removing lignin from plant fibers until the lignin content becomes less than 2%, and a removal treatment of fibers and lignin obtained in the removal step are performed. A mixing step of mixing unfinished plant fibers, a papermaking step of making paper using the mixture obtained in the mixing step, a slitting step of slitting the paper obtained in the papermaking step, and slitting were performed. A paper formed from paper containing fibers having a lignin content of 15% or more and plant fibers having a lignin content of less than 2% is provided with a twisting step of twisting the paper to produce paper yarn. Suitable for production, which allows useful articles to be produced using paper containing different types of fibers.

On the other hand, among the major tree species that make up Japan's forests, the area of coniferous forests occupies about 52% of the total, and in the artificial forests that occupy about 80% of the forest area of Japan, about 97% of them are coniferous trees. It is a forest. Many planted forests require thinning to maintain their health, but most of the thinned wood is left in the mountains and has nowhere to go.

In other words, while most of the main raw materials for cloth, such as cotton, wool, and silk, depend on imports, these domestic conifers, especially paper woven fabrics woven from paper threads made from thinned wood, are imported. It will be a useful material that can use domestic resources without relying heavily on silk.

In addition, the natural paper fibers produced in this way have excellent features such as environmental friendliness, high UV protection, high antibacterial properties, and ultra-lightweight, and 100% paper woven fabric has no fluff, so the skin is fluffy. It has the excellent property that even sensitive people can use it with peace of mind.

From this point of view, the applicant has repeated many years of research and development and improvement, and has reached the development of Japanese paper yarn made from domestic coniferous trees and Japanese paper woven fabric manufactured from it. Conventionally, the Japanese paper and Japanese paper woven fabric made from domestic coniferous trees, especially thinned wood of coniferous trees, have not been produced in Japan, and the applicant has been a sword in this kind of field. However, the manufacturing process of the Japanese paper and the Japanese paper woven fabric includes a step of making chips from the raw material conifer, a cooking process of cooking the raw material chips and extracting cellulose from the raw material chips to form pulp, and uniformly stretching the pulp to form Japanese paper. It was equipped with a paper-making process, a slitting process for slitting Japanese paper, and a twisting process for twisting the slitted paper to produce paper yarn, but it is used when using domestically produced coniferous trees, especially thinned coniferous trees. There are variations in the part of the coniferous tree to be used, the individual water content, and the dry state. There was a problem that the fiber length varied due to the remaining hard part, and the quality of Japanese paper itself varied.

Patent No. 6570101 Fig. 3

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a yarn in which the quality of Japanese paper fiber itself does not vary even if the coniferous tree used as a raw material varies. It is an object of the present invention to provide a uniform and stable Japanese paper thread and Japanese paper cloth having excellent tensile strength required for the woven product.

Another object of the present invention is to provide Japanese paper thread and Japanese paper cloth which have good antibacterial properties of softwood which is a raw material.

In the method for producing Japanese paper thread according to claim 1, a measurement step for measuring the absolute dry weight of a coniferous tree chip as a raw material, and the coniferous tree chip and an amount of a drug calculated based on the measurement result are added to the measurement result. A paper making process in which a soaking step of immersing in water in an amount calculated based on the above for a predetermined time, a cooking step of cooking the soaked coniferous tree chips, chemicals and water, and a paper making by mixing cellulose and Manila hemp extracted in the cooking step. It is characterized by including a step, a slit step of slitting the Japanese paper made in the paper making step, and a twisting step of twisting the Japanese paper slit in the slit step to form a Japanese paper thread.

In the method for producing Japanese paper thread according to claim 1, in the step of extracting cellulose from the raw material chip of the coniferous tree, it is immersed in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chip of the coniferous tree for a long time. Since the step is provided, the quality of the cellulose remaining in the cooking step can be kept constant and good.

The method for producing Japanese paper thread according to claim 2 is the method for producing paper thread according to claim 1. In the method for producing paper thread according to claim 1, the chemical in the dipping step is water of 50% of the absolute dry weight of the coniferous tree chips measured in the measuring step. It is sodium oxide, and the water in the dipping step is 300% of the absolute dry weight of the coniferous tree chips measured in the measuring step.

In the method for producing Japanese paper thread according to claim 2, in the step of extracting cellulose from the raw material chip of the coniferous tree, it is immersed in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chip of the coniferous tree for a long time. Since the process is provided, the quality of the cellulose remaining in the cooking process can be kept constant and good, and Japanese paper yarn having excellent tensile strength can be produced.

The method for producing washi yarn according to claim 3 is the method for producing washi yarn according to claim 1 or 2, wherein the ratio of mixing cellulose extracted from coniferous tree chips and Manila hemp in the paper making step is 1: 1. It is characterized by being.

In the method for producing Japanese yarn according to claim 3, in the papermaking process, the mixing ratio of cellulose extracted from softwood chips and Manila hemp is 1: 1 so that the antibacterial property possessed by softwood is preferable. Can be retained.

The method for manufacturing Japanese paper cloth according to claim 4 further includes a weaving step for manufacturing Japanese paper cloth by weaving the Japanese paper thread obtained by the method for manufacturing Japanese paper thread according to any one of claims 1 to 3. It is a feature.

In the method for producing Japanese paper cloth according to claim 4, in the step of extracting cellulose from the raw material chips of coniferous trees, they are immersed in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chips of coniferous trees for a long time. Since the process is provided, the quality of the cellulose remaining in the cooking process is kept good at a certain level, and it is possible to produce a Japanese paper cloth made of Japanese paper yarn having excellent tensile strength.

The Japanese paper thread according to claim 5 is characterized in that it is manufactured by the method for producing Japanese paper thread according to any one of claims 1 to 3.

The Japanese paper thread according to claim 5 includes, in the step of extracting cellulose from the raw material chip of the coniferous tree, a step of immersing it in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chip of the coniferous tree for a long time. Therefore, the quality of the cellulose remaining in the cooking step is kept constant and good, so that the Japanese paper yarn has a constant quality and excellent tensile strength.

The Japanese paper cloth according to claim 6 is characterized in that it is manufactured by the method for manufacturing Japanese paper cloth according to claim 4.

The Japanese paper cloth according to claim 6 includes a step of extracting cellulose from the raw material chips of the coniferous tree, which comprises a step of immersing the raw material chips of the coniferous tree in a predetermined amount of chemicals and water for a long time according to the absolute dry weight. Therefore, since the weaving is performed from Japanese paper yarn having a constant quality and excellent tensile strength, in which the quality of the cellulose remaining in the cooking step is kept constant and good, the Japanese paper cloth having a constant quality and excellent tensile strength is obtained.

According to the method for producing Japanese paper thread according to claim 1, the measurement step of measuring the absolute dry weight of the coniferous tree chip as a raw material and the measurement of the coniferous tree chip and the amount of the drug calculated based on the measurement result are measured. A soaking step of immersing in water in an amount calculated based on the results for a predetermined time, a cooking step of evaporating the soaked coniferous tree chips, chemicals and water, and a paper making by mixing cellulose and Manila hemp extracted in the cooking step. Since it is provided with a paper making step of forming a Japanese paper thread, a slit step of slitting the Japanese paper made in the paper making step, and a twisting step of twisting the Japanese paper slit in the slit step to form a Japanese paper thread, cellulose is obtained from the raw material chip of the coniferous tree. In the step of extracting, the step of immersing in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chips of the coniferous tree for a long time is provided, so that the quality of the cellulose remaining in the cooking step can be kept constant and good. can.

According to the method for producing Japanese paper thread according to claim 2, in the method for producing paper thread according to claim 1, the agent in the dipping step is 50% of the absolute dry weight of the coniferous tree chips measured in the measuring step. Since the sodium hydroxide of the above and the water in the dipping step is 300% of the absolute dry weight of the coniferous tree chips measured in the measuring step, the raw material chips of the coniferous tree in the step of extracting cellulose from the raw material chips of the coniferous tree. Since the process of immersing in the optimum amount of chemicals and water according to the absolute dry weight of the product is provided for a long time, the quality of cellulose remaining in the cooking process is maintained at a constant level and good, and Japanese paper yarn having excellent tensile strength is produced. Can be done.

The method for producing Japanese paper thread according to claim 3 is the method for producing Japanese paper thread according to claim 1 or 2, wherein the ratio of mixing cellulose extracted from coniferous tree chips and Manila hemp in the paper making step is 1: 1. Therefore, since the mixing ratio of cellulose extracted from the coniferous tree chips in the papermaking process and Manila hemp is one-to-one, the antibacterial property possessed by the coniferous tree can be suitably maintained.

According to the method for manufacturing Japanese paper cloth according to claim 4, the weaving step for manufacturing Japanese paper cloth by weaving the Japanese paper thread obtained by the Japanese paper thread manufacturing method according to any one of claims 1 to 3 is further provided. Therefore, in the step of extracting cellulose from the raw material chips of coniferous trees, a step of immersing in a predetermined amount of chemicals and water according to the absolute dry weight of the raw material chips of coniferous trees for a long time is provided, so that the quality of cellulose remaining in the cooking step is provided. It is possible to produce a Japanese paper cloth made of Japanese paper yarn, which is kept at a constant level and has excellent tensile strength.

According to the Japanese paper thread according to claim 5, since it is manufactured by the method for producing Japanese paper thread according to any one of claims 1 to 3, in the step of extracting cellulose from the raw material chip of the coniferous tree, the raw material chip of the coniferous tree Since it is provided with a step of immersing it in a predetermined amount of chemicals and water according to the absolute dry weight of the product for a long time, the quality of the cellulose remaining in the cooking step is kept good at a certain level, and therefore the tensile strength with a constant quality is excellent. It becomes Japanese paper thread.

According to the Japanese paper cloth according to the sixth aspect, since it is manufactured by the method for producing the Japanese paper cloth according to the third aspect, in the step of extracting cellulose from the raw material chips of the coniferous tree, it depends on the absolute dry weight of the raw material chips of the coniferous tree. Since it is provided with a process of immersing in a predetermined amount of chemicals and water for a long time, it is woven from Japanese paper yarn having a constant quality and excellent tensile strength, which keeps the quality of cellulose remaining in the cooking process constant and good. , A Japanese paper cloth with constant quality and excellent tensile strength.

It is a flowchart which shows the manufacturing method of the Japanese paper cloth which concerns on this invention. It is a schematic diagram which shows the measurement process. It is a schematic diagram which shows the calculation process. It is a schematic diagram which shows the dipping process. It is a schematic diagram which shows the cooking process. It is a schematic diagram which shows the papermaking process. It is a schematic diagram which shows the slit process. It is a schematic diagram which shows the plying process. It is a schematic diagram which shows the weaving process.

Hereinafter, examples for manufacturing the Japanese paper cloth JF according to the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart showing a method for manufacturing Japanese paper cloth according to the present invention. As shown in FIG. 1, the Japanese paper cloth JF according to the present invention has a measurement step 10 for measuring the absolute dry weight of the coniferous tree chip CT as a raw material, and a calculation for calculating the amounts of drug NO and water HO based on the measurement results. The step 20 and the dipping step 30 in which the coniferous tree chip CT and the drug NO calculated based on the measurement result are immersed in the water HO in the amount calculated based on the measurement result for a predetermined time, and the immersion step 30 In the cooking step 40 for evaporating the coniferous tree chip CT, the drug NO and the water HO, the papermaking step 50 for mixing cellulose CL extracted from the coniferous tree chip CT and the Manila hemp pulp MH in the cooking step, and the papermaking step 50. A slit step 60 for slitting the paper-made Japanese paper JP, a twisting step 70 for twisting the Japanese paper JP slit in the slit step 60 to form a Japanese paper thread JY, and a Japanese paper cloth JF are manufactured by weaving the Japanese paper thread JY. The weaving step 80 is provided.

The coniferous chip CT used as a raw material is produced from domestically produced coniferous trees such as cedar, cypress, and cypress leaves, and in particular, when thinned wood thereof is used, domestic resources can be effectively used. Further, as the Japanese paper thread having excellent antibacterial properties and the raw material of Japanese paper, which will be described later, coniferous trees such as cedar, cypress, and cypress leaves having high antibacterial properties are suitable.

In the measurement step 10, for example, as shown in FIG. 2, first, the water content of the softwood chip CT is measured, and the weight 14 of the softwood chip CT is measured by a weighing scale 13 (note that the weight is measured in advance). The water content of the coniferous chip CT may be measured.) The moisture content of the softwood chip CT is measured by, for example, a wood moisture meter 12. As the measurement by the wood moisture meter 12, it is preferable to use a high frequency type moisture meter, an electric resistance type moisture meter, a microwave transmission type moisture meter, or the like. Further, the raw material to be measured may be the coniferous tree cut into an appropriate size before being chipped. If the water content of the softwood chip CT can be measured, the water content 15 of the softwood chip CT is calculated from the weight 14 of the softwood chip CT, and the water content 15 is calculated from the weight 14 of the softwood chip CT measured by the weighing scale 13. Is subtracted to calculate the absolute dry weight 11.

In the calculation step 20, as shown in FIG. 3, the amounts of the drug NO and water HO added in the cooking step 40 are calculated based on the absolute dry weight 11 of the softwood chip CT measured in the measurement step 10. do. The drug NO is sodium hydroxide, and the amount added is 50% by weight of the absolute dry weight of the softwood chip CT. The water to be added is 300% of the absolute dry weight 11 of the softwood chip CT. For example, when the softwood chip CT is 1000 kg and the water content is 30%, the absolute dry weight 11 of the softwood chip CT is 700 kg, the sodium hydroxide NO to be added is 350 kg, and the water HO to be added. Is 2100 kg. When the softwood chip CT is 1000 kg and the water content is 40%, the absolute dry weight 11 of the softwood chip CT is 600 kg, the sodium hydroxide NO to be added is 300 kg, and water to be added. HO is 1800 kg.

As shown in FIG. 4, in the immersion step 30, the drug NO of the weight calculated based on the absolute dry weight 11 of the softwood chip CT measured in the measurement step 10 is applied to the softwood tip CT together with the softwood tip CT. This is a step of immersing in water NO having a weight calculated based on the absolute dry weight 11 of the above. For example, the drug NO of the weight calculated based on the absolute dry weight 11 of the softwood chip CT, the softwood chip CT, and the weight calculated based on the absolute dry weight 11 of the softwood chip CT in the earth kettle 31. Immerse in a state of being mixed with water NO for about 24 to 48 hours. During this period, for example, even if conifer thinned wood is used as a raw material, one lot of the conifer chip CT may be used in various parts, the time since logging, the condition, the season at the time of logging and recovery, the weather, and the like. Even if there is a mixture of woody states such as water content and hardness, the mixed softwood chip CT is applied to the appropriate amount of the sodium hydroxide NO and water HO for a relatively long time. By soaking for about 24 to 48 hours, the leveling of the woody state such as water content and hardness in the softwood chip CT progresses, and the strength of the finally produced Japanese paper thread JY and Japanese paper JF cloth ( Tensile strength) can be increased to improve quality and stability.

In the cooking step 40, for example, as shown in FIG. 5, the earth kettle 31 contains the sodium hydroxide NO and the softwood chip CT having a weight calculated based on the absolute dry weight 11 of the softwood chip CT. A mixture of water HO having a weight calculated based on the absolute dry weight 11 of the softwood chip CT and soaked for about 24 to 48 hours is brought to a temperature of about 160 to 170 degrees and added. Boil for about 6 hours in a pressurized state to dissolve and remove lignin and a part of hemicellulose contained in the softwood chip CT, and extract cellulose CL which is a raw material of the Japanese paper JP.

Then, in the papermaking step 50, as shown in FIG. 6, the cellulose CL obtained in the cooking step 40 and the Manila hemp pulp MH are mixed and made into paper to produce the Japanese paper JP. At this time, if the mixing ratio of the cellulose CL extracted from the softwood chip CT in the cooking step 40 and the Manila hemp pulp MH is 50%, the antibacterial property of the softwood chip CT is not deteriorated. High antibacterial properties can be maintained in the Japanese paper JP, the Japanese paper thread JY, and the Japanese paper cloth JF obtained in the following steps while holding the paper.

Then, in the slit step 60, which is the next step, as shown in FIG. 7, the Japanese paper base paper is finely cut into fine paper SL having a width of about 1 to 4 mm, and in the plying step 70, as shown in FIG. In addition, it is wound in a spiral shape and twisted. Manufactures Japanese paper thread JY. Then, in the weaving step 80, as shown in FIG. 9, the Japanese paper thread JY is woven to produce the Japanese paper cloth JF.

Of the above steps, the Japanese paper JP obtained in the paper making step 50 is finally manufactured in the dipping step 30 by increasing the water content of the coniferous tree chip CT and the leveling of the woody state such as hardness and softness. It is possible to increase the strength (tensile strength) of Japanese paper thread JY and Japanese paper JF cloth to improve and stabilize the quality.

Table 1 is a conventional paper quality test table.

According to the paper quality test table shown in Table 1, the conventional manufacturing method (the amount of the chemical and water blended is not measured based on the absolute dry weight of the raw coniferous tree, and the step of immersing with them for a long time is provided. The tensile strength (kg / 15 mm) of the Japanese paper obtained by (not) is "2,4", "1,8", "2,53", "2,25", "2,662". Met.

Table 2 is a product property comparison table of Japanese paper JP obtained in the manufacturing process according to the present invention.

In the product property comparison table of Japanese paper JP obtained in the manufacturing process according to the present invention shown in Table 2, the Japanese paper JP obtained in the manufacturing process according to the present invention is compared with the Japanese paper manufactured by the conventional manufacturing method. The tensile strength (kg / 15 mm) MD is "2,74", "3,14", and "2,77", which are high values of 2,74 kg / 15 mm or more, and the above-mentioned products to be manufactured from now on. It enhances the strength (tensile strength) of Japanese paper thread JY and the Japanese paper JF cloth, and contributes to the improvement and stability of quality.

さらに、表３に示す前記和紙糸ＪＹの抗菌性試験結果表に示されるように、本発明に係る製造方法によって得られる前記前記和紙糸ＪＹは、洗濯をしていない状態で抗菌活性値は「５，９」であり、洗濯回数が１０回のものでも抗菌活性値は「３，６」であり、高い抗菌活性値を示しており、この数値はＪＩＳ Ｌ １９０２：２０１５によると、抗菌効果としては「強い効果が認められる」ものとなっている。一方、一般社団法人繊維評価技術協議会による「SEKマーク繊維製品認証基準」では、「抗菌防臭加工」の基準は、抗菌活性値(A)≧２，２であるところ、この基準を十分にクリアするものとなっており、優れた抗菌性を保持することが認められる。 Table 3 is a table of antibacterial test results of the Japanese paper thread JY.

Further, as shown in the antibacterial test result table of the Japanese paper thread JY shown in Table 3, the Japanese paper thread JY obtained by the production method according to the present invention has an antibacterial activity value of "" in the unwashed state. The antibacterial activity value is "3, 6" even if the number of washings is 10 times, which is "5, 9", indicating a high antibacterial activity value. According to JIS L 1902: 2015, this value is as an antibacterial effect. Is "a strong effect is recognized". On the other hand, in the "SEK Mark Textile Product Certification Criteria" by the Textile Evaluation Technology Council, the criteria for "antibacterial deodorant processing" are antibacterial activity value (A) ≥ 2,2, which is sufficiently cleared. It is recognized that it retains excellent antibacterial properties.

10 Measurement process 20 Chemical calculation process 30 Immersion process 40 Steaming process 50 Paper making process 60 Slit process 70 Plying process 80 Weaving process

CT Softwood Chip NO Chemical HO Water CL Cellulose MH Manila Hemp Pulp JP Japanese Paper JY Japanese Paper Thread JF Japanese Paper Cloth

The method for producing Japanese paper thread according to claim 1 comprises a measurement step of measuring the absolute dry weight of the thinned wood chips of coniferous trees as a raw material, and the thinned wood chips and the amount of chemicals calculated based on the measurement results. A dipping step of immersing in an amount of water calculated based on the measurement result for a predetermined time, a cooking step of cooking the soaked coniferous tree chips, chemicals and water, and a mixture of cellulose and Manila hemp extracted in the cooking step. It is characterized by including a paper making process for making paper, a slit process for slitting Japanese paper made in the paper making process, and a twisting process for twisting the Japanese paper slit in the slit process to form Japanese paper yarn. ..

The method for producing Japanese paper thread according to claim 2 is the method for producing Japanese paper thread according to claim 1, wherein the chemical in the dipping step is 50% of the absolute dry weight of the thinned wood chips measured in the measuring step. It is sodium hydroxide, and the water in the dipping step is 300% of the absolute dry weight of the thinned wood chips measured in the measuring step.

According to the method for producing Japanese paper thread according to claim 1, a measurement step for measuring the absolute dry weight of the thinned wood chips of the coniferous tree as a raw material, and the thinned wood chips and the amount of chemicals calculated based on the measurement results. The dipping step of immersing the soaked coniferous tree chips, chemicals and water in an amount of water calculated based on the measurement results for a predetermined time, and the cellulose and Manila hemp extracted in the cooking step. A coniferous tree has a paper-making process of mixing and making paper, a slitting process of slitting the Japanese paper made in the paper-making process, and a twisting process of twisting the Japanese paper slit in the slitting process to form Japanese paper yarn. In the step of extracting cellulose from the raw material chips, the step of immersing in a predetermined amount of chemicals and water according to the absolute dry weight of the coniferous raw material chips for a long time is provided, so that the quality of the cellulose remaining in the cooking step is constant and good. Can be kept in.

According to the method for producing Japanese paper yarn according to claim 2, in the method for producing Japanese paper yarn according to claim 1, the chemical agent in the dipping step is 50 of the absolute dry weight of the thinned wood chips measured in the measuring step. % So sodium hydroxide, and the water in the dipping step is 300% of the absolute dry weight of the thinned wood chips measured in the measuring step. Therefore, in the step of extracting cellulose from the raw material chips of the coniferous tree, the coniferous tree Since it is equipped with an optimum quantity of chemicals according to the absolute dry weight of the raw material chip and a process of immersing it in water for a long time, the quality of cellulose remaining in the cooking process is kept good at a constant level, and Japanese paper yarn with excellent tensile strength is manufactured. can do.

Claims (6)

A measurement process that measures the absolute dry weight of softwood chips, which are the raw material,
A dipping step of immersing the softwood chip and the amount of the drug calculated based on the measurement result in the amount of water calculated based on the measurement result for a predetermined time.
The cooking step of cooking the soaked softwood chips, chemicals and water, and
A papermaking process in which cellulose extracted from softwood chips and Manila hemp are mixed and made in the cooking process, and a papermaking process.
A slitting process for slitting Japanese paper made in the papermaking process,
A plying process of twisting washi paper slit in the slit process to form washi yarn,
A method for manufacturing Japanese paper yarn, which is characterized by the above.
The agent in the dipping step is sodium hydroxide, which is 50% of the absolute dry weight of the softwood chip measured in the measuring step, and the water in the dipping step is the absolute dry weight of the softwood chip measured in the measuring step. The method for producing Japanese paper yarn according to claim 1, wherein the content is 300% of that of the Japanese paper yarn.
The method for producing Japanese paper yarn according to claim 1 or 2, wherein in the paper making step, the mixing ratio of cellulose extracted from softwood chips and Manila hemp is 1: 1.
A method for producing a Japanese paper cloth, further comprising a weaving step for producing a Japanese paper cloth by weaving the Japanese paper thread obtained by the method for producing a Japanese paper thread according to any one of claims 1 to 3.
A Japanese paper thread produced by the method for producing Japanese paper thread according to any one of claims 1 to 3.
A Japanese paper cloth manufactured by the method for manufacturing a Japanese paper cloth according to claim 4.

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