Thk Co., Ltd.

Oji Holdings Corporation

Yusuke Todoroki

Yuichi Noguchi

Tetsuya Miura

Mengchen Zhao

Akimasa Yoshida

Soshi Miyahara

Kentaro Nishimura

Takashi Sakuyama

Ikue Sugiyama

Masahiko Yoshino

Ikue Homma

Tsutomu Togashi

Lina Teng

Kazuyoshi Mochizuki

Ryuji Muramatsu

Tomoki Watanabe

It is an object of the present invention to provide a resin composite comprising ultrafine cellulose fibers, in which deterioration of a resin component is suppressed. The present invention relates to a cellulose fiber-containing resin composition comprising cellulose fibers with a fiber width of 1000 nm or less having phosphoric acid groups or phosphoric acid group-derived substituents, and a resin, wherein the counterions of the phosphoric acid groups or phosphoric acid group-derived substituents are organic onium ions, and the conjugate bases of the organic onium ions have a pKb value of 1.0 or more.

Cellulose fiber-containing resin composition, sheet, and molded body

It is an object of the present invention to provide ultrafine cellulose fibers capable of exhibiting favorable dispersibility even in an organic solvent. The present invention relates to cellulose fibers having a fiber width of 1000 nm or less and having phosphoric acid groups or phosphoric acid group-derived substituents, wherein the content of the phosphoric acid groups or phosphoric acid group-derived substituents is 0.5 mmol/g or more, and the supernatant yield measured by an measurement method (a) is 70% or less.

Cellulose fibers, cellulose fiber-containing composition, cellulose fiber dispersion, and method for producing cellulose fibers

A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.

Screw device

It is an object of the present invention to optimize a bleaching process in a step of producing phosphorylated cellulose fibers. The present invention relates to a pulp comprising cellulose fibers having 0.5 mmol/g or more of phosphoric acid groups or phosphoric acid group-derived substituents, wherein when the pulp is processed into a sheet and four sheets are laminated on one another, the ISO whiteness of the laminate is 82% or more. Moreover, when the pulp of the present invention is processed into a sheet and four sheets are then laminated on one another, the b* value of the obtained laminate according to the L*a*b* color system is 5.5 or less.

Pulp, slurry, sheet, laminate, and method for producing pulp

There is provided a roller screw in which a twisted amount of an unloaded return path is reduced. The roller screw has a screw shafthaving a spiral roller-rolling surfaceon an outer peripheral surface thereof; a nuthaving a spiral loaded roller-rolling surfaceon an inner peripheral surface thereof, the spiral loaded roller-rolling surface being opposed to the roller-rolling surfaceof the screw shaft; a circulation memberarranged in the nutand formed to have an unloaded return pathconnecting one end and the other end of the loaded roller-rolling surface, whose turn number is less than one, of the nut; and a plurality of rollersarranged in a one-turn roller circulation path composed by a loaded roller-rolling pathand the unloaded return path. The circulation memberguides the rollers which have moved and arrived at the one end of the loaded roller-rolling pathhaving less than one turn, to the unloaded return path, and then returns the rollers to the other end of the loaded roller-rolling pathhaving less than one turn. The number of turns of the loaded roller-rolling pathis set to be less than one turn, whereby the rollerswhich have arrived at one end of the loaded roller-rolling pathcan be transferred to the other end of the loaded roller-rolling pathwithout changing their attitudes.

Roller screw and method of circulating rollers in roller screw

Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shafthaving a spiral roller rolling surfaceformed on an outer peripheral surface thereof; a nuthaving a loaded roller rolling surfaceformed in an inner peripheral surface thereof; a circulation memberhaving an unloaded return path connecting one end of the loaded roller rolling surfaceof the nutto an opposite end thereof; and a plurality of rollersarranged in a loaded roller rolling pathand the unloaded return path. In the circulation member, as a scooping portion that juts toward the screw shaftand provided for scooping the rollersmoving in the loaded roller rolling pathup into the unloaded return path, a pair of diagonal corresponding partsis provided which are in contact with diagonal partsof a rectangular side surface of each rollerand a width between which is gradually narrower as they are deeper in the unloaded return path in such a manner that a cross section of the unloaded return path is closer to a rectangle.

Roller screw

Growing community of inventors

Tokyo, Japan

Yusuke Todoroki