Abstract: A refiner includes a main body, a rotation shaft provided inside the main body, a tapered rotor attached to the rotation shaft with a space therein, a stator provided in the main body, a rotor beating portion provided on the rotor and having a groove between bars and through-holes, a stator beating portion on the stator with a groove between bars and through-holes, a raw material supply portion for supplying a raw material into the main body, and a raw material discharge portion for discharging a beaten raw material outside the main body. A portion of the raw material guided to a small-diameter opening portion of the rotor and the space of the rotor is beaten by passing through the through-holes of the rotor beating portion and the stator beating portion, and is discharged outside the stator beating portion from the through-holes of the stator beating portion.

Abstract: A papermaking screen device finely selects disintegrated fibers effectively to enhance a fine selection effect, and is made compact. In the papermaking screen device, fibers in an area of a papermaking raw material having a high concentration on a downstream side of a screen are disintegrated by cooperation between stirring-member one-side disintegration portions and screen other-side disintegration portions, and the disintegrated fibers are guided to an outside from a portion inside the cylindrical screen facing end-portion-side stirring members to be finely selected so as to improve the fine selection effect. Also, the papermaking screen device includes disintegration functions inside the screen so as to effectively use a height in a vertical direction of the screen, and make a whole device compact as well.

Abstract: A refiner includes a main body, a rotation shaft provided inside the main body, a tapered rotor attached to the rotation shaft with a space therein, a stator provided in the main body, a rotor beating portion provided on the rotor and having a groove between bars and through-holes, a stator beating portion on the stator with a groove between bars and through-holes, a raw material supply portion for supplying a raw material into the main body, and a raw material discharge portion for discharging a beaten raw material outside the main body. A portion of the raw material guided to a small-diameter opening portion of the rotor and the space of the rotor is beaten by passing through the through-holes of the rotor beating portion and the stator beating portion, and is discharged outside the stator beating portion from the through-holes of the stator beating portion.

Abstract: A papermaking strainer disposed adjacent to a rotor, for sieving a disintegrated paper material, includes a strainer for facing the rotor, including a plurality of strainer holes formed in the strainer; and a plurality of peripheral walls protruding from a surface of the strainer to surround the plurality of strainer holes, or a plurality of peripheral concaved groove portions concaved from the surface of the strainer to surround the plurality of strainer holes.

Abstract: A cleaning apparatus for a belt-shaped member for papermaking includes a rotary member situated adjacent to the belt-shaped member and having a plurality of rotary blades rotating in a direction opposite to a movement direction of the belt-shaped member. The rotary member is arranged such that the plurality of rotary blades contacts one side of the belt-shaped member in order, to scrape off foreign materials on the belt-shaped member.

Abstract: A screen apparatus includes a tank receiving a papermaking raw material; a screen partitioning the tank into a primary chamber and a secondary chamber; a papermaking raw material supply passage for supplying a papermaking raw material to the tank; a foreign material discharge passage for discharges the papermaking raw material containing a foreign material that does not pass through the screen to the outside of the tank; a papermaking raw material discharge passage communicating with the secondary chamber, and discharging the papermaking raw material passing through the screen to the outside of the tank; a cylindrical rotor body rotatably provided inside the screen, and stirs the papermaking raw material in the primary chamber; and a stepped stirring member provided on the side surface except for both end surfaces of the rotor body. The stepped stirring member is formed at a falling gradient with respect to a papermaking raw material flow.

Abstract: A pulper includes a tank having a papermaking material insertion port and a discharge port; a strainer covering the discharge port of the tank; a rotor provided above the strainer for disintegrating the papermaking material and having a rotor vane with a front edge formed linearly in a plan view; a front cutter blade attached to a back surface of the rotor, and extending long in a longitudinal direction along the front edge of the rotary vane, the front cutter blade being formed linearly in a plan view; and an inclined cutter blade attached to the back surface of the rotor. The inclined cutter blade extends long in the longitudinal direction and is inclined away from the front cutter blade toward an outside. The inclined cutter blade and the front cutter blade are integrally formed via an inner portion of the inclined cutter blade.

Abstract: In the emulsion polymerization of a monomer mixture comprising an aromatic vinyl compound, a vinyl cyanide compound and if desired, other vinyl compounds copolymerizable therewith in an aqueous medium, the vinyl cyanide compound is further added to the polymerization system in a controlled velocity during the substantial period of polymerization from the initial stage. When the copolymer thus obtained is incorporated into, for example, an acrylonitrile-butadiene-styrene terpolymer composition, thermoplastic resin compositions not coloring upon molding are obtained with a good impact resistance and heat resistance.