Nippon Paper Industries Co., Ltd.

Aikawa Iron Works Co., Ltd.

Shisei Goto

Toru Nakatani

Moe Fukuoka

Masatoshi Oishi

Keigo Watanabe

Takeshi Iimori

Hiromichi Tsuji

Takaharu Noda

Koji Ninagawa

Takanori Miyanishi

Yuki Takahashi

Takashi Yamaguchi

Masaki Ito

Hideki Hayasaka

Masato Takayama

Naoyuki Sugawara

Chie Yuzawa

Koji Okomori

Seiki Yoneshige

Hiroyoshi Suzuki

Yasunobu Ooka

Isao Onodera

Dai Nagahara

Tetsuro Takahashi

Tatsumi Hosaka

Ayaka Hasegawa

Kosuke Okamoto

Hiroaki Noguchi

Hisashi Iwabuchi

Yasuyuki Kamijo

Hiroki Ohtake

Sakiko Nakada

Yohji Tuji

Tsukasa Oba

Hirohiko Koizumi

Harutaka Watanabe

Eisaku Katori

Provided is a fibrillated chemically modified cellulose fiber, which has a type-I cellulose crystallinity of at least 50%, an anionic charge density of 0.10-2.00 meq/g, and an average fiber diameter of greater than 500 nm. Also, provided is a fibrillated chemically modified cellulose fiber, wherein the value (A/B) obtained by dividing the viscosity A measured at a shear rate of 0.01/sec by the viscosity B measured at a shear rate of 1000/sec in an aqueous dispersion having a solid content of 1 mass % is at least 100. These fibers have high water retention and high thixotropy.

Fibrillated chemically modified cellulose fiber

The present invention aims to develop a technique for efficiently preparing deinked pulp from prints made with UV-curable inks. According to the processes for preparing deinked pulp of the present invention, high quality deinked pulp can be obtained by performing the steps of: disintegrating printed waste paper containing UV prints in water to give a waste paper slurry; and applying a mechanical process to the waste paper slurry using a rotary disintegrator.

Methods for deinking UV prints

To provide a new inorganic particle composite fiber including a large amount of adhering inorganic particles, An inorganic particle composite fiber includes: fiber; and inorganic particles fixed to the fiber, the fiber being thread-like in shape, the inorganic particles being fixed to the fiber via an ionic polymer.

Inorganic particle composite fiber, method for manufacturing same, and molded article

The present invention aims to provide techniques for efficiently synthesizing inorganic microparticles. According to the present invention, inorganic carbonate microparticles can be synthesized by generating ultrafine bubbles containing carbonic acid gas by injecting a gas containing carbonic acid gas and a liquid into a reaction vessel through a nozzle to deposit an inorganic carbonate having an average primary particle size of 300 nm or less in the presence of the ultrafine bubbles.

Processes for preparing inorganic carbonates

The present invention provides a titanium oxide composite fiber in which titanium oxide is efficiently fixed in fiber, and a method for producing the titanium oxide composite fiber. A composite fiber of the present invention includes: fiber; titanium oxide; and an inorganic binder, at least part of the inorganic binder containing at least one inorganic compound selected from (i) an inorganic salt containing at least one of: at least one metal selected from magnesium, barium, aluminum, copper, iron, and zinc; and silicic acid and (ii) metal particles containing the at least one metal, the titanium oxide being firmly fixed to the fiber via the inorganic binder.

Titanium oxide composite fibers and method for producing same

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.

Complexes of cellulose fibers and inorganic particles

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.

Method for manufacturing inorganic particle composite fiber sheet

A composition in accordance with an aspect of the present invention includes: composite fibers composed of inorganic particles and fibers; and at least one of (i) different-type inorganic particles which are different in type from the inorganic particles, (ii) different-type fibers which are different in type from the fibers, and (iii) organic particles.

Composition which contains composite fibers composed of inorganic particles and fibers

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.

Complexes of hydrotalcites and fibers

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.

Complexes of magnesium carbonate microparticles and fibers as well as processes for preparing them

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.

Complexes of calcium phosphate microparticles and fibers as well as processes for preparing them

The present invention aims to provide techniques for preparing complexes of calcium carbonate particles having an average primary particle size of less than 1 &#x3bc;m and a fiber. Complexes of calcium carbonate microparticles having an average primary particle size of less than 1 &#x3bc;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.

Complexes of calcium carbonate microparticles and fibers as well as processes for preparing them

The present invention aims to provide techniques for efficiently preparing calcium carbonate particles having an average primary particle size of less than 1 &#x3bc;m. Calcium carbonate microparticles having an average primary particle size of less than 1 &#x3bc;m can be synthesized efficiently by synthesizing calcium carbonate in the presence of cavitation bubbles.

Calcium carbonate microparticles and processes for preparing them

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.

Processes for preparing pulp and paper

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. According to the first invention, cavitation is generated in a pulp suspension preferably by a liquid jet and the resulting fine bubbles are introduced into the pulp suspension to adjust the pulp suspension to a desired freeness by means of the impact force induced by collapse of the fine bubbles in a process for producing pulp. According to the second invention, process water containing 50% by weight or less, based on total solids, of long pulp fiber fractions used in a process for producing pulp and/or paper is treated by cavitation generated by a liquid jet and then returned to the process for producing pulp and/or paper and reused.

Growing community of inventors

Tokyo, Japan

Shisei Goto