Abstract: The present invention provides a method for reducing web break caused in preparing, by continuous paper making, a fiber sheet containing a high content of functional inorganic substance. The composite fiber sheet manufacturing method includes: generating composite fibers composed of cellulosic fibers and inorganic particles by synthesizing the inorganic particles in slurry containing the cellulosic fibers; and continuously generating a sheet by supplying composite-fiber-containing slurry including the composite fibers to a continuous paper machine. In the composite fiber generating step, at least one of (i) slurry containing cellulosic fibers having a length of 1.2 mm to 2.0 mm in an amount of 16% or more in terms of length-weighted fiber length distribution (%) and (ii) slurry containing cellulosic fibers having a length of 1.2 mm to 3.2 mm in an amount of 30% or more in terms of length-weighted fiber length distribution (%) is used.

Abstract: The present invention provides a method for producing a composite of fibers and inorganic particles including a step of producing a composite of inorganic particles and fibers by synthesizing the inorganic particles in a solution containing the fibers, and a step of processing the composite of inorganic particles and fibers. Moreover, the present invention provides a laminate containing the composite of fibers and inorganic particles which is obtained by the production method.

Abstract: The present invention aims to provide techniques for preparing complexes of a hydrotalcite and a fiber. The complexes of a hydrotalcite and a fiber can be synthesized efficiently by synthesizing the hydrotalcite in an aqueous system in the presence of the fiber.

Abstract: The present invention aims to provide techniques for preparing complexes of calcium carbonate particles having an average primary particle size of less than 1 ?m and a fiber. Complexes of calcium carbonate microparticles having an average primary particle size of less than 1 ?m and a fiber can be synthesized efficiently by synthesizing calcium carbonate in a solution bearing the fiber while injecting a liquid into a reaction vessel.

Abstract: The present invention aims to provide techniques for preparing complexes of magnesium carbonate particles and a fiber. The complexes of magnesium carbonate microparticles and a fiber can be synthesized efficiently by synthesizing the magnesium carbonate in a solution containing the fiber.

Abstract: The present invention aims to provide techniques for preparing complexes of calcium phosphate particles and a fiber. According to the present invention, complexes of calcium phosphate particles and a fiber are provided. According to the present invention, calcium phosphate-fiber complexes in which titanium is retained can be further obtained.

Abstract: The present invention aims to provide techniques for efficiently preparing calcium carbonate particles having an average primary particle size of less than 1 ?m. Calcium carbonate microparticles having an average primary particle size of less than 1 ?m can be synthesized efficiently by synthesizing calcium carbonate in the presence of cavitation bubbles.

Abstract: The present invention aims to provide cellulose fibers covered by inorganic particles on the fiber surface. According to the present invention, complexes of a cellulose fiber and inorganic particles wherein 15% or more of the surface of the cellulose fiber is covered by the inorganic particles can be obtained.

Abstract: The present invention aims to provide a technique for easily and rapidly sorting printed materials suitable as raw materials of recycled paper. Printed materials that are hard to recycle as waste paper can be identified by irradiating the surface of the printed materials with light and measuring the reflected light. Specifically, good quality recycled paper can be made efficiently from printed materials by removing printed materials having an absorption band around 1720 cm?1, around 1260 cm?1, around 1160 cm?1, or around 700 cm?1 from waste paper raw materials when the printed materials are irradiated with light on their surface.

Abstract: The present invention aims to provide techniques for efficiently preparing calcium carbonate particles having an average primary particle size of less than 1 ?m. Calcium carbonate microparticles having an average primary particle size of less than 1 ?m can be synthesized efficiently by synthesizing calcium carbonate in the presence of cavitation bubbles.

Abstract: The present invention aims to provide techniques for preparing complexes of calcium carbonate particles having an average primary particle size of less than 1 ?m and a fiber. Complexes of calcium carbonate microparticles having an average primary particle size of less than 1 ?m and a fiber can be synthesized efficiently by synthesizing calcium carbonate in a solution bearing the fiber while injecting a liquid into a reaction vessel.

Abstract: The present invention aims to provide recycled fibers having a low dirt content and excellent appearance and strength properties derived from sanitary products. Recycled fibers having a superabsorbent polymer (SAP) content of less than 10% obtained by subjecting a sanitary product containing a cellulose pulp to a recycling process per se have good appearance, and moldings prepared by using the recycled fibers also have excellent appearance and strength properties. Further, the recycled fibers preferably have a dirt area fraction of 50,000 mm2/m2 or less when determined by a staining assay using cobalt (II) chloride hexahydrate, and a Canadian standard freeness of 600 ml or more.

Abstract: The purpose of the present invention is to provide technology for regenerating pulp having high quality with compact pulp regenerating equipment and less energy. In the pulp regenerating method of the present invention, pulp slurry containing 1.5 wt % or more of a solid component including waste paper pulp is separated into a long fiber fraction and a short fiber fraction by using an outward type slit screen including an opening portion having a slit width in the range of 0.1 mm to 0.3 mm. The solid component ratio of the long fiber fraction and the short fiber fraction is in the range from 10:90 to 60:40, and the difference in Canadian Standard Freeness of the long fiber fraction and the short fiber fraction is in the range of 100 ml to 300 ml.

Abstract: The first invention aims to provide a method for preparing stiffer bulky pulp at a freeness level comparable to that obtained by mechanical treatments to improve the bulkiness of product paper by searching for a method capable of adjusting freeness while suppressing damage to pulp fibers and internal fibrillation in a process for producing pulp. The second invention aims to strip contaminants deposited on pulp fibers and/or inorganic particles to reduce adhesion of the contaminants and decrease microorganisms in a treatment of process water containing long pulp fiber fractions used in a process for producing pulp and paper, thereby clarifying process water and thus preparing high-quality pulp and paper.

Abstract: The purpose of the present invention is to provide technology for regenerating pulp having high quality with compact pulp regenerating equipment and less energy. In the pulp regenerating method of the present invention, pulp slurry containing 1.5 wt % or more of a solid component including waste paper pulp is separated into a long fiber fraction and a short fiber fraction by using an outward type slit screen including an opening portion having a slit width in the range of 0.1 mm to 0.3 mm. The solid component ratio of the long fiber fraction and the short fiber fraction is in the range from 10:90 to 60:40, and the difference in Canadian Standard Freeness of the long fiber fraction and the short fiber fraction is in the range of 100 ml to 300 ml.

Abstract: Herein provided are methods for determining deposition of contaminants significantly influencing machine runnability or product quality in manufacturing processes of pulp and paper, especially determining the degree of deposition and the morphology of deposits of sticky contaminants or pitch and for evaluating the effect of chemicals for reducing deposition. In a manufacturing process of pulp and paper is used a method comprising: determining the degree of deposition of a contaminant from a liquid or slurry on a quartz crystal oscillator; and quantifying the morphology of deposits on the surface of the quartz crystal oscillator by image analysis. Further, a method comprising adding a chemical for reducing deposition to the liquid or slurry and then quantifying the degree of deposition and the morphology of deposits is used to evaluate the effect of the chemical.

Abstract: Herein provided are methods for determining deposition of contaminants significantly influencing machine runnability or product quality in manufacturing processes of pulp and paper, especially determining the degree of deposition and the morphology of deposits of sticky contaminants or pitch and for evaluating the effect of chemicals for reducing deposition. In a manufacturing process of pulp and paper is used a method comprising: determining the degree of deposition of a contaminant from a liquid or slurry on a quartz crystal oscillator; and quantifying the morphology of deposits on the surface of the quartz crystal oscillator by image analysis. Further, a method comprising adding a chemical for reducing deposition to the liquid or slurry and then quantifying the degree of deposition and the morphology of deposits is used to evaluate the effect of the chemical.

Abstract: A papermaking raw material processor capable of reforming pulp in papermaking a process using cavitation includes a first pump 5 jets jet liquid and second pump 6 jets suspension containing; e.g., pulp fibers into a processing unit inside which cavitation is generated by generation of a jet stream. Inside processing unit 2, a jet stream generates cavitation to carry out a reforming processing in which ink, or the like, is removed from the fibers by a blast resulting from collapse of cavitation bubbles generated there. The liquid after reforming processing is returned to second tank 4, except for a part of it fed to downstream steps, while the suspension is processed, as circulated between processing unit 2 and second tank 6.

Abstract: The present invention provides methods for producing a base paper for coated printing paper and a coated paper by neutral papermaking using a roll and blade gap former type paper machine including a drainage mechanism based on a drainage blade immediately downstream of initial drainage via a forming roll, comprising adding a cationic polyacrylamide-based material having a weight-average molecular weight of 10,000,000 or more determined by intrinsic viscosity measurement as a retention aid to a stock to convert it into paper. According to the present invention, the retention, formation and internal bond strength of the stock can be improved. In the present invention, an anionic microparticle and/or a coagulant can also be used.

Abstract: Pulp processing equipment used to produce high-quality recycled pulp with little damage to fibers, high brightness and low residual ink by means of a force selectively acting on fiber surfaces during the process of recycling waste paper is disclosed. Moreover, fiber surfaces are modified by means of a force acting on only the fiber surfaces to obtain high-quality pulp and to render harmless dirts deteriorating pulp quality. A jet system is provided having one or more nozzles for jetting an aqueous slurry containing a material comprising cellulose into a vessel.