JP2007231439A - Wool paper sheet and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing wool paper sheet by carrying out a papermaking in such a condition that wool fibers are homogeneously dispersed without the mutual entanglement of the wool fibers to effect homogeneously blending the wool fibers, and to provide such wool paper sheet free of pills and fiber loss and excellent in decorativeness as an interior. <P>SOLUTION: The improved wool paper sheet is obtained by carrying out papermaking using a dispersion prepared by dispersing wool fibers and binder fibers in water. The method for producing the wool paper sheet incorporates 100 pts.wt. of the dispersion with 15-90 pts.wt. of the wool fibers and 0.5-50 pts.wt. of the binder fibers. In the wool paper sheet thus obtained, part or the whole of the cuticle component of the surface layer of the wool fibers is removed by oxidation treatment of the wool fibers and the fiber length of the wool fibers is 2 cm or shorter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention has a decorative property, and by applying the adsorption function of wool fibers to the purification action against bad odors in the air, heavy metals in water, and coloring agents, it can exhibit functions for interior, civil engineering, and architectural fields, The present invention relates to a wool papermaking sheet that can be applied to a plant-grown soil sheet and a method for producing the same.

Conventionally, a sheet having a purifying function has been used to purify air and water. The sheet having the purification function is very convenient because it can be used regardless of the place, and post-treatment of the used sheet can be easily performed by a method such as incineration. As the sheet having the purification function, a sheet in which activated carbon is included in paper or cloth is mainly used, and mass production is easy. Furthermore, the sheet containing activated carbon has little effect of removing coloration by the colorant.
In addition, a method of using a sheet for soil where plants are grown has been developed. For example, a container for plant growth characterized by being formed of a material composed of natural textile fibers bonded together by a binder such as polypropylene, starch, or polyvinyl alcohol is disclosed (for example, a patent) Reference 1). Sheets used for plant-growing soil are made by placing fertilizer into paper or cloth, and mass production is easy. However, since it can be applied only for the purpose of plant growth, it is not very versatile. In addition, the use of this sheet has a problem that water management of the soil becomes difficult.

  On the other hand, since wool fiber is composed of amino acids, it has a function as a nutrient for organisms. Besides, it has many antibacterial properties, adsorptive properties, moisture retention properties, heat generation properties, flame retardancy, UV cut properties, etc. It is a natural substance having the functions of In particular, because of its selective adsorption performance due to its molecular structure, applications for purifying air and water have been attempted. In addition, it is also applied to plant growth fertilizer by applying its function as a nutrient to living organisms.

Sheets using previously developed wool fibers include a large amount of wool fibers collected and simply compressed and pressed, wool fibers wetted with soapy water and felted, and wool fiber resin There is a thing hardened in the shape of a plate using. However, the sheet developed earlier is not versatile because it cannot produce thin sheets, and the strength of the manufactured sheet is uneven, and it may be broken during use, so that it is not easy to work and long sheet production is not possible. Because it has many problems such as lack of productivity because it is difficult, it has not been practically used. Feltification has been difficult to apply to wool fibers having a short fiber length and wool fibers having a scratched cuticle component.
In addition, there is a method of mixing wool fibers with heat-melt fibers to make a nonwoven fabric. However, in the case of wool fibers, the original fiber length is short, so it is necessary to use a base fabric or laminate nonwoven fabrics. Therefore, there has been a problem that the manufacturing cost becomes high.

As a measure for solving the above-described problems, a method for forming wool fibers into a sheet by papermaking has been devised. In this method, wool fibers are dispersed in water to prepare a dispersion, and a sheet is formed by squeezing the prepared dispersion with a net. The fibers are uniformly dispersed in water in the dispersion. In this state, the dispersion is rinsed with a mesh to form a sheet by utilizing the entanglement of fibers that is generated when water in the dispersion is instantaneously removed from the mesh. A sheet formed only of wool fibers does not have sufficient tensile cutting strength. Therefore, in order to reinforce the tensile cutting strength of the sheet, a paper is usually made by adding a binder to the dispersion. As the binder, a pellet-like resin, a solution-like resin, or a fibrous resin (hot-melt fiber) has been used.
JP-A-9-149733 (Claim 1, paragraphs [0010] and [0011])

  However, when pellet resin or solution resin is used as a binder, the hardness of the obtained sheet is increased, but the strength is not sufficiently reinforced. In addition, the effect of improving strength is high in hot melt fibers, and the use of polyvinyl alcohol hot melt fibers has been attempted, but polyvinyl alcohol hot melt fibers are gradually dissolved in water from the surface and have adhesiveness. Due to the characteristics, there was a drawback that wool fibers were aggregated.

Further, since the surface of the wool fiber is usually hydrophobic, when the dispersion is prepared by dispersing the wool fiber in water, the wool fiber often floats on the water surface. When trying to prepare a dispersion by forcibly stirring the wool fibers floating on the water surface, the wool fibers are partially entangled and a hairball is generated. The pills deteriorate the wearability of the formed sheet, and there is a problem that the appearance is not good when the sheet is used as an interior. Therefore, when preparing a dispersion liquid, in order to improve the dispersibility of the wool fiber with respect to water, adding a dispersing agent, such as surfactant and polyacrylamide, and a thickener is also tried. However, even if a surfactant, a dispersant, a thickener or the like was added, the uniform dispersion effect was not sufficient.
Furthermore, the papermaking sheet with a small amount of wool fibers is not practical because the adsorptivity of the wool fibers is not sufficiently exhibited and the purification action is not so different from when no wool fibers are blended.

The first object of the present invention is to make a paper making sheet in which wool fibers are uniformly blended by making paper in a state where wool fibers are uniformly dispersed by eliminating the entanglement between the wool fibers. It is to provide a papermaking sheet and a manufacturing method thereof.
The second object of the present invention is to provide a wool papermaking sheet that is free from pills and fluff and has excellent decorativeness as an interior, and a method for producing the same.
A third object of the present invention is to provide a wool papermaking sheet excellent in environmental suitability that can contribute to the purification of air and water in a living environment by applying the adsorption performance of wool fibers and a method for producing the same.
The fourth object of the present invention is to provide a wool paper sheet having both biodegradability and soil fertility and suitable for plant-grown soil and a method for producing the same.

The invention according to claim 1 is an improvement of a wool papermaking sheet obtained by papermaking a dispersion prepared by dispersing wool fibers and binder fibers in water. The characteristic configuration is that 15 to 90 parts by weight of wool fibers and 0.5 to 50 parts by weight of binder fibers are blended with 100 parts by weight of the dispersion liquid, and the wool fibers are oxidized and cuticles on the surface of the wool fibers. A part or all of the components are removed, the fiber length is 2 cm or less, and the binder fiber is a hydrophobic fiber.
The invention according to claim 4 is an improvement of a method for producing a wool paper sheet obtained by paper making a dispersion prepared by dispersing wool fibers and binder fibers in water. The characteristic configuration is that 15 to 90 parts by weight of wool fibers and 0.5 to 50 parts by weight of binder fibers are blended with 100 parts by weight of the dispersion liquid, and the wool fibers are oxidized and cuticles on the surface of the wool fibers. A part or all of the components are removed, the fiber length is 2 cm or less, and the binder fiber is a hydrophobic fiber.
In the invention according to claim 1 or 4, the wool fiber and the binder fiber are blended so as to have a predetermined ratio, and part or all of the cuticle component of the surface layer is removed by oxidation treatment as the wool fiber, and the fiber length is increased. By using a fiber that is 2 cm or less and using a hydrophobic fiber as the binder fiber, the entanglement between the wool fibers is eliminated, and the paper can be made in a state where the wool fibers are uniformly dispersed without being entangled. A wool papermaking sheet in which wool fibers are uniformly blended can be obtained. Such a wool paper sheet does not have pills or fluff and is excellent in decorativeness as an interior. In addition, it is possible to purify the air by adsorbing the odors in the air in the living environment by applying the acid and alkali adsorption performance of the wool fiber constituting the wool paper sheet. In addition, a thiol group is generated along with the cleavage of the sulfide bond by oxidizing the wool fiber, and the thiol group selectively adsorbs the heavy metal. Therefore, the wool papermaking sheet | seat of this invention can be utilized for effective utilization of the seawater resources by purification | cleaning of heavy metal containing water, or heavy metal collection | recovery. Further, by applying the excellent dye adsorptivity of the wool fiber constituting the wool paper sheet, the wool paper sheet of the present invention can be used for decolorization by dye collection of dye waste water. Furthermore, since the wool paper sheet of the present invention has both biodegradability and soil fertility, the wool paper sheet of the present invention is inserted into the upper part of the soil seeded with the plant seeds to obtain the wool fiber. Biodegradation of amino acids disperses the soil in the soil and fertilizes the soil, and further contributes to the moisturizing properties of the wool fibers, so that plant growth can be promoted.

  In the wool paper sheet of the present invention, wool fibers and binder fibers are blended so as to have a predetermined ratio, and part or all of the surface cuticle component is removed by oxidation treatment as wool fibers, and the fiber length is 2 cm or less. By using a fiber that exhibits hydrophobicity as a binder fiber, the entanglement between the wool fibers can be eliminated, and the paper can be made in a state in which the wool fibers are uniformly dispersed without being entangled. A wool paper sheet in which fibers are uniformly blended can be obtained. Such a wool paper sheet does not have pills or fluff and is excellent in decorativeness as an interior. In addition, it is possible to purify the air by adsorbing the odors in the air in the living environment by applying the acid and alkali adsorption performance of the wool fiber constituting the wool paper sheet. In addition, a thiol group is generated along with the cleavage of the sulfide bond by oxidizing the wool fiber, and the thiol group selectively adsorbs the heavy metal. Therefore, the wool papermaking sheet | seat of this invention can be utilized for effective utilization of the seawater resources by purification | cleaning of heavy metal containing water, or heavy metal collection | recovery. Further, by applying the excellent dye adsorptivity of the wool fiber constituting the wool paper sheet, the wool paper sheet of the present invention can be used for decolorization by dye collection of dye waste water. Furthermore, since the wool paper sheet of the present invention has both biodegradability and soil fertility, the wool paper sheet of the present invention is inserted into the upper part of the soil seeded with the plant seeds to obtain the wool fiber. Biodegradation of amino acids disperses the soil in the soil and fertilizes the soil, and further contributes to the moisturizing properties of the wool fibers, so that the growth of the plant can be promoted.

Next, the best mode for carrying out the present invention will be described.
In the method for producing a wool paper sheet of the present invention, a wool paper sheet is obtained by paper-making a dispersion prepared by dispersing wool fibers and binder fibers in water. The characteristic configuration is that 15 to 90 parts by weight of wool fibers and 0.5 to 50 parts by weight of binder fibers are blended with 100 parts by weight of the dispersion liquid, and the wool fibers are oxidized and cuticles on the surface of the wool fibers. A part or all of the components are removed, the fiber length is 2 cm or less, and the binder fiber is a hydrophobic fiber.

  Examples of the wool fibers used in the production method of the present invention include merino wool, lamb wool, tasmania wool, south down wool, syrupshire wool, hampshire wool, oxford wool, dosette horn wool, tubiot wool, welsh wool, radner wool, hard Examples include wick wool, comeback wool, coridale wool, poros wool, coarse wool, shetland wool, barry wool, tender wool, break-in wool, kempi wool, black wool, peas, belly, and skin wool. In addition, any one of a state of loosening from fluff, raised fluff, shaving waste, yarn or cloth may be used.

  Wool fiber is mainly composed of a protein composed of amino acids and has many disulfide bonds. The cuticle component covering the wool fiber surface layer is highly hydrophobic. This is because the cuticle component is mainly composed of keratin that exhibits hydrophobicity. As a result, wool fibers do not readily penetrate water. After adding and mixing wool fibers in water, it is possible to disperse water over the wool fibers by dispersing over time, raising the temperature of the wool fiber addition liquid, or stirring the wool fiber addition liquid vigorously. In the above method, wool fibers naturally aggregate and entangle in the liquid. Therefore, in the production method of the present invention, the wool fiber before paper making is subjected to an oxidation treatment to mainly cleave the disulfide bonds in keratin constituting the cuticle component of the wool fiber, thereby breaking the protein structure. Part or all of the cuticle component of the fiber surface layer is removed. By removing the hydrophobic cuticle component, the hydrophobicity of the wool fiber is lowered and the hydrophilicity is improved. In particular, it is preferable to remove almost all of the cuticle components to such an extent that residue of the cuticle components cannot be confirmed with an electron microscope.

  As a method for removing a part or all of the cuticle component, the cuticle component is removed from the wool fiber not only by the oxidation treatment but also by the reduction treatment or the hydrolytic enzyme (protease). However, the manufacturing method of the present invention is limited to the method of removing by oxidation treatment. By performing the oxidation treatment, a thiol group and a Bunte salt anion are finally generated, so that the purification function is easily exhibited in the obtained wool paper sheet. As the oxidation treatment method, a mixture of sodium hypochlorite and sulfuric acid is spray-coated on the wool fiber or the wool fiber is immersed in the mixed liquid, the wool fiber is immersed in the sodium dichloroisocyanurate solution and gradually Typical examples are DCCA, which uses sodium hypochlorite generated in the same manner as the Croy method, and Dylan, in which wool fibers are immersed in a solution of monopersulfuric acid. Examples thereof include a method using potassium, a method using hydrogen peroxide, and a method using oxygen plasma discharge.

  The degree of modification of the wool fiber by the oxidation treatment is preferably in a range having a water absorption of 60 seconds or less when measured by a dropping method based on the JIS L 1096A method. If the water absorption is within the above range, the wool fiber easily penetrates into water, and further, the wool fiber is anionized by oxidation, and the wool fiber is hardly entangled due to the interaction between the ionic property and water. For example, the water absorption of 60 seconds or less can be obtained when measured by the dropping method by efficiently removing the cuticle component of the wool fiber surface layer by using the Croy method in the oxidation treatment.

  Although the wool fiber becomes difficult to be entangled by performing the above oxidation treatment, when the fiber length of the wool fiber is still long, the ends are easily entangled with each other and easily formed into a thread shape. Therefore, in the production method of the present invention, wool fibers having a fiber length of 2 cm or less are used. Entanglement can be completely prevented by setting the fiber length to 2 cm or less. In order to set the fiber length of the wool fiber to 2 cm or less, for example, cutting with scissors, cutting with a cutting machine (G45L1 manufactured by Endo Kogyo Co., Ltd.), selecting and collecting fiber lengths that meet the conditions, etc. Can be obtained by the method. In particular, the fiber length of wool fibers should be within the range of 0.5 to 2 cm in order to sufficiently exert the odor adsorption effect of the wool paper sheet and to produce a light shadow effect when the wool paper sheet is used as an interior. It is preferable to do. When the wool fiber is cut to a fiber length of 2 cm or less, this cutting step may be performed before the oxidation treatment. In particular, in the case of oxidation treatment in an aqueous solution such as oxidation treatment with a sodium hypochlorite solution, an internal addition method can be used, and since the oxidation treatment to papermaking can be performed continuously, the drying step can be omitted, which is convenient. . In addition, when the oxidation treatment is performed outside water, such as oxygen plasma discharge, the treatment is easier in the long state before the wool fiber is cut.

  The wool fibers may be imparted or improved in functionality by adsorbing a functional inorganic material in advance or by an internal addition method during papermaking. Examples of the functional inorganic substance include photocatalytic titanium oxide powder, Bincho charcoal powder, zeolite powder, tourmaline powder, germanium powder, silver powder, and zinc powder. These functional inorganic substances can be chemically bonded to an anionized wool fiber by oxidation treatment by cationization using a cationizing agent such as a quaternary ammonium salt in an aqueous dispersion or aqueous solution. it can.

The binder fiber has the effect of improving the dispersion of the wool fiber in the papermaking, melting during drying, fixing the wool fibers together and fixing them, and improving the strength. The binder fiber used in the production method of the present invention is a fiber exhibiting hydrophobicity. Particularly preferred are hydrophobic and biodegradable fibers having a heat melting property with a melting point of 130 to 180 ° C. Hydrophobic hot melt fibers, unlike polyvinyl alcohol fibers that have been used in the past, do not cause stickiness due to surface dissolution when dispersed in water together with wool fibers, and do not aggregate wool fibers. . The melting point of this binder fiber is defined within the range of 130 to 180 ° C., if the melting point is less than 130 ° C., the binder fiber is re-melted under the environmental conditions using the obtained wool paper sheet, This is because the sexuality will occur. Also, if the melting point exceeds 180 ° C, the binder fiber will not melt unless the drying temperature of the paper sheet is set to this temperature or higher, and wool and the like will turn yellow when dried under such temperature conditions. is there. Examples of the binder fiber include heat-meltable polylactic acid fibers such as product name PL-80 and product name PL-10 manufactured by Unitika Fiber Co., Ltd.
In the production method of the present invention, a binder fiber having a fiber length of 2 cm or less is used. The reason why the fiber length of the binder fiber is defined as 2 cm or less is that when the fiber length exceeds 2 cm, the binder fiber itself is entangled to cause a problem that prevents uniform dispersion of the wool fiber.

  In a dispersion prepared by dispersing wool fibers and binder fibers in water, 15 to 90 parts by weight of wool fibers and 0.5 to 50 parts by weight of binder fibers with respect to 100 parts by weight of the dispersion are used. Is blended into In particular, it is preferable to blend so that the wool fiber is 20 to 70 parts by weight and the binder fiber is 5 to 30 parts by weight. When the proportion of the wool fiber is less than 15 parts by weight, the functions such as the adsorptivity of the wool fiber cannot be sufficiently exhibited, and the purification function is not so different from the case where the wool fiber is not blended, so that it is not practical. On the other hand, when the proportion of the wool fiber exceeds 90 parts by weight, there arises a problem that the tensile strength of the wool paper sheet is insufficient. If the binder fiber ratio is less than 0.5 parts by weight, sufficient tensile cutting strength cannot be reinforced for the wool paper sheet, and if the binder fiber ratio exceeds 50 parts by weight, bending breakage or delay of biodegradation may occur. There arises a problem that the characteristics of the wool fibers are offset by the characteristics of the binder fibers and cannot be fully exhibited.

  Moreover, in the manufacturing method of this invention, you may further mix | blend a pulp with the dispersion liquid containing wool fiber and binder fiber. By mix | blending a pulp, the intensity | strength and texture of the obtained wool paper-making sheet can be improved, and a flexibility can be provided. Examples of the pulp include wood chip pulp, non-wood chip pulp, and recycled pulp. When the pulp is further blended, it is preferably blended so as to have a ratio of 10 to 50 parts by weight of wool fibers, 5 to 20 parts by weight of binder fibers, and 30 to 70 parts by weight of pulp.

As a method for producing the wool paper sheet of the present invention, 25 parts by weight of fluffed merino wool as wool fibers, 5 parts by weight of hot-melt polylactic acid fibers as binder fibers, and 70 parts by weight of wood chip pulp as pulps are blended. A method for producing the wool papermaking sheet will be described.
First, the merino wool raising waste is immersed in a mixed solution of a sodium hypochlorite solution and sulfuric acid and then dechlorinated with sodium sulfite. Subsequently, it is immersed in a buffer solution of pH 7 for about 1 day. It dries after that and cuts nap so that a fiber length may become about 1 cm using a cutting machine. The raising | fluff waste at this time has a water absorption of about 11 second, when measured by the dripping method based on JISL1096A method. Next, only 25 parts by weight of an aqueous dispersion of the above-described oxidized fluffed waste is added to 70 parts by weight of the pulp in a suspension obtained by digesting, separating, and beating wood pulp, and the mixture is stirred. While stirring, only 5 parts by weight of binder fiber is added to 70 parts by weight of pulp. Next, after stirring with a high-speed mixer to prepare a dispersion, the dispersion is transferred to a paper machine bath, the mesh sheet is raised to drain water, and then compressed with a press. Furthermore, the wool papermaking sheet of the present invention can be obtained by drying the compressed product with a hot roll.

  In the above production method, wool fibers and binder fibers are blended so as to have a predetermined ratio, and some or all of the surface cuticle components are removed by oxidation treatment as wool fibers, and the fiber length is 2 cm or less. By using a hydrophobic fiber as the binder fiber, the entanglement between the wool fibers can be eliminated, and the paper can be made in a state in which the wool fibers are uniformly dispersed without being entangled. The wool papermaking sheet | seat mix | blended with can be obtained. Such a wool paper sheet does not have pills or fluff and is excellent in decorativeness as an interior. In addition, the wool paper sheet obtained by the above manufacturing method applies the acid and alkali adsorption performance of the wool fibers constituting the wool paper sheet and purifies air by adsorbing odors in the air in the living environment. Can do. For example, when an electric shade is produced using a wool paper sheet obtained by the above production method, a very soft shade effect can be obtained, so that the decorativeness is excellent. Moreover, by installing around the toilet, it is possible to absorb ammonia odor and obtain a comfortable living space.

  Moreover, in the wool paper sheet obtained by the said manufacturing method, the thiol group is produced | generated with the cleavage of a sulfide bond by oxidizing a wool fiber, The thiol group selectively adsorb | sucks a heavy metal. Therefore, by placing the obtained wool paper sheet in water in which, for example, silver chloride or copper chloride is dissolved, the wool fibers constituting the wool paper sheet adsorb silver ions and copper ions, so the wool paper sheet of the present invention Can be used for effective utilization of seawater resources by purifying heavy metal-containing water and recovering heavy metals. Further, by applying the excellent dye adsorptivity of the wool fiber constituting the wool paper sheet, the wool paper sheet of the present invention can be used for decolorization by dye collection of dye waste water.

  Furthermore, since the wool paper sheet obtained by the above production method has both biodegradability and soil fertility, the wool paper sheet of the present invention is placed in the upper part of the soil seeded with plants. Since the wool fibers are biodegraded, amino acids are dispersed in the soil to fertilize the soil, and the moisture retention of the wool fibers also contributes to the growth of the plant.

Next, examples of the present invention will be described in detail together with comparative examples.
<Example 1>
First, merino wool fluffs cut to 1 cm fiber length as wool fiber, polylactic acid fiber (manufactured by Unitika Fiber Co., Ltd .; PL-80) as binder fiber, wood chip pulp as pulp, and poly as dispersion promoter Acrylamide dispersion accelerators (manufactured by Meisei Chemical Co., Ltd .; Pamol) were prepared. Next, 2 g of merino wool napping waste was immersed in 100 ml of a mixed solution of 6% 5% aqueous sodium hypochlorite and 6% aqueous 5% sulfuric acid for 1 minute, washed with water, and immersed in 100 ml of 13% aqueous sodium sulfite for 1 minute. The brushed waste was oxidized by washing with water. Next, oxidized fluffed scrap, 0.5 g of polylactic acid fiber and 7.5 g of wood chip pulp were added to 4000 ml of water, respectively, and further 4 ml of polyacrylamide dispersion accelerator (manufactured by Meisei Chemical Co., Ltd .; Pamol) was added. A dispersion was prepared by stirring at high speed with a mixer. The dispersion was transferred to a water tank of a paper machine and paper was made by quickly draining water. The paper-made sheet was dehydrated while being suppressed with a 10 kg roller, and further dried with a hot roll at 180 ° C. to obtain a wool paper sheet containing 20% wool fiber. The obtained wool paper sheet had a thickness of 220 μm and a weight of 91.1 g / m ² .

<Comparative Example 1>
A papermaking sheet was obtained in the same manner as in Example 1 except that no fluffed wool fibers and binder fibers were used. The resulting papermaking sheet had a thickness of 125 μm and a weight of 88.4 g / m ² .
<Comparative example 2>
A wool papermaking sheet was obtained in the same manner as in Example 1 except that no binder fiber was used. The obtained wool paper sheet had a thickness of 243 μm and a weight of 102.2 g / m ² .
<Comparative Example 3>
A wool papermaking sheet was obtained in the same manner as in Example 1 except that polyvinyl alcohol fiber was used instead of polylactic acid fiber as the binder fiber. The obtained wool paper sheet had a thickness of 240 μm and a weight of 106.7 g / m ² .
<Comparative example 4>
A wool papermaking sheet was obtained in the same manner as in Example 1 except that the wool fibers were not oxidized. The water absorption of the fluffed wool fibers exceeded 120 seconds.
<Comparative Example 5>
Papermaking was performed in the same manner as in Example 1 without cutting the fiber length of the woolen fiber flakes to 2 cm, but in a state where many fibers having a fiber length of 2 cm or more were mixed. I couldn't.

<Comparison test 1>
About the papermaking sheet obtained in Example 1 and Comparative Examples 1 to 4, appearance uniformity, texture, tensile strength, deodorization property, ultraviolet shielding property, dye adsorption property, metal adsorption property, moisture retention property, water retention property and plant growth The promotion effects were evaluated as shown below.
Appearance uniformity was evaluated by observing both appearances of the obtained wool paper sheet, and the number of pills (aggregation of hairs) present on both sides of the sheet as an observation target. The case where there was no hairball was evaluated as “excellent”, and the evaluation was divided into four in the order of “good”, “acceptable” and “impossible”. An evaluation of “impossible” means that there are very many pills on both sides of the sheet. In addition, the texture was evaluated by dividing the obtained wool paper sheet by hand in three ways: “hard”, “slightly hard”, and “soft”. The tensile strength was determined by measuring the breaking strength when the obtained wool paper sheet was stretched and stretched in the longitudinal direction under the same conditions by the strip method in accordance with JIS L 1096 method, and this breaking strength was evaluated as the tensile strength. It was. The unit of breaking strength is represented by N (Newton). Further, the deodorizing property was obtained by cutting the obtained wool paper sheet into a 10 cm square size, placing the cut wool paper sheet in a 200 cc container filled with 1 ppm of ammonia gas, and sealing the container in this state. The ammonia concentration reduction rate was calculated by measuring the ammonia gas present in the container after holding for 2 hours with an ammonia gas detector tube, and this reduction rate was used as the deodorant evaluation value. Further, the ultraviolet shielding property was detected using an absorption analyzer when the obtained wool paper sheet was irradiated with ultraviolet light having a wavelength of 320 nm, and this shielding rate was used as an evaluation value of the ultraviolet shielding property.

  The dye-adsorbing property is obtained by dyeing the obtained wool paper sheet for 2 hours at 80 ° C. with 1% acidic dye consisting of mixed gray of yellow, red and blue, and a bath ratio of 1:50. The dye adsorption rate was calculated from the ratio of the transmittance of the acid dye residual liquid after dyeing to the acid dye initial liquid before dyeing using an absorption analyzer, and this dye adsorption rate was used as an evaluation value for dye adsorption. In addition, the metal adsorptivity is 10 mmol of silver chloride and 5 g of wool paper sheet in 100 ml of water, and the silver ion strength of the aqueous silver chloride solution after immersion for 1 hour at 50 ° C. is measured with an X-ray spectroscopic analyzer. The amount of decrease in the silver ion concentration was determined, and the amount of adhesion calculated from the amount of decrease was used as the evaluation value for metal adsorption. In addition, for the moisture retention, first, the obtained wool paper sheet was allowed to stand for 3 hours in an environment of an air temperature of 20 ° C. and a humidity of 65% to maintain the moisture content of the wool paper sheet at a constant condition. Next, after standing for 3 hours in an environment where the temperature is 40 ° C. and humidity is 80%, the moisture content of the wool paper sheet is calculated, and then the humidity is lowered to 40% at the same temperature and left standing for 1 hour. The moisture content of the papermaking sheet was calculated. The ratio of the moisture content left in the environment of 40 ° C. and humidity 40% to the moisture content of the calculated temperature 40 ° C. and humidity 80% was set as the evaluation value of moisture retention. The moisture content was determined by subtracting the weight in the dry state from the weight of the wool paper sheet under the specified environment and dividing the result by the weight in the dry state. In addition, the water retention was determined by moistening the obtained wool paper sheet under a certain condition using a mangle, and then determining the water content when left standing in an environment of an air temperature of 20 ° C. and a humidity of 65% for 30 minutes. This water content was used as an evaluation value for water retention. Furthermore, the plant growth promotion effect was observed by putting the obtained wool paper sheet into the upper part of the soil planted with Primula Biary seedlings and observing the degree of growth for 2 months until flowering. The evaluation was made by comparing the growth of Primula Biary seedlings planted under the same conditions at the same time on the soil without the wool paper sheet. The obtained results are shown in Table 1 and Table 2, respectively.

  As apparent from Table 1, in the appearance uniformity, in the sheets of Comparative Examples 1 to 4, there were many pills present on both sides of the sheet, and the decorativeness was inferior. It was confirmed that it does not exist, has excellent decorativeness, and can be used as an interior. Moreover, the texture of the sheet | seat of the comparative example 2 which does not use binder fiber and the sheet | seat of Example 1 was soft touch feeling. The other Comparative Example 1, Comparative Example 3 and 4 sheets were a little hard or hard. The tensile strength was low in Comparative Example 3 in which no binder fiber was used. Moreover, the tendency of the intensity | strength of the sheet | seat of the comparative example 1 which consists only of the pulp which does not use the wool fiber and binder fiber, and the sheet | seat of the comparative example 3 which used the polyvinyl alcohol fiber as binder fiber was seen high. The sheet of Example 1 and the sheet of Comparative Example 4 in which the wool fiber was not subjected to the oxidation treatment had a strength of around 250 N, and a practically sufficient strength was obtained. As for the deodorizing property, the sheet of Comparative Example 1 containing no wool fiber does not have a very good deodorizing effect. This is presumably because ammonia was only adsorbed on the pulp constituting the sheet. On the other hand, the sheet of Example 1 and Comparative Examples 2 and 3 containing wool fibers had a high deodorizing effect. As for the ultraviolet shielding property, the sheet of Comparative Example 1 containing no wool fiber had a lower shielding rate than the sheet of Example 1 containing wool fiber.

As is apparent from Table 2, the dye adsorptivity of the sheet of Comparative Example 1 containing no wool fiber was very low. On the other hand, in the sheets of Example 1 and Comparative Examples 2 and 3 containing wool fibers, the adsorptivity of the dye was high, and the evaluation results reflected the adsorption performance of the wool fibers. It was confirmed that the metal adsorptivity absorbed the metal at a high rate by immersing the sheet of Example 1 in heavy metal-containing water. In terms of moisture retention and water retention, the sheet of Comparative Example 1 containing no wool fibers resulted in low moisture retention and water retention. On the other hand, the sheets of Example 1 and Comparative Examples 2 and 3 containing wool fibers had high moisture retention and water retention, and the evaluation results reflected the moisture retention performance of the wool fibers. As for the plant growth promoting effect, the sheet of Comparative Example 1 containing no wool fiber was not greatly different from the growth of the seedlings planted in soil not using the sheet, and the promoting effect was not obtained. On the other hand, by using the sheet of Example 1 containing wool fibers, a tendency of higher degree of growth is seen compared to the growth of seedlings planted in soil not using the sheet, and it has a growth promoting effect. I found out.

Claims (6)

In the wool paper sheet obtained by paper making a dispersion prepared by dispersing wool fiber and binder fiber in water,
15 to 90 parts by weight of the wool fiber and 100 to 50 parts by weight of the binder fiber are blended with respect to 100 parts by weight of the dispersion,
Wool papermaking characterized in that part or all of the cuticle component of the wool fiber surface layer is removed by oxidation treatment of the wool fiber, the fiber length is 2 cm or less, and the binder fiber is a hydrophobic fiber Sheet.   The wool papermaking sheet according to claim 1, wherein the binder fibers are hydrophobic and biodegradable fibers having a melting point of 130 to 180 ° C and exhibiting heat melting properties, and the fiber length is 2 cm or less.   The wool papermaking sheet according to claim 1, wherein the wool fiber has a water absorption of 60 seconds or less when measured by a dropping method in accordance with JIS L 1096A method. In the method for producing a wool papermaking sheet obtained by papermaking a dispersion prepared by dispersing wool fiber and binder fiber in water,
15 to 90 parts by weight of the wool fiber and 100 to 50 parts by weight of the binder fiber are blended with respect to 100 parts by weight of the dispersion,
Wool papermaking characterized in that part or all of the cuticle component of the wool fiber surface layer is removed by oxidation treatment of the wool fiber, the fiber length is 2 cm or less, and the binder fiber is a hydrophobic fiber Sheet manufacturing method.   The manufacturing method according to claim 4, wherein the binder fiber is a hydrophobic and biodegradable fiber having a melting point of 130 to 180 ° C. and exhibiting heat melting properties, and the fiber length is 2 cm or less. The manufacturing method according to claim 4, wherein the wool fiber has a water absorption of 60 seconds or less when measured by a dropping method based on the JIS L 1096A method.