Abstract: A kneading segment includes plural wing portions integrally formed along an axis such that angles, around the axis, of the plural wing portions are shifted. At a part of a leading end of each wing portion where a wing leading end surface and a wing surface connect with each other, a first flow surface facilitates flow of material between the wing leading end surface and the wing surface. At a part of a base end of each wing portion where a wing surface and a wing side surface of another wing portion adjacent to each wing portion connect with each other, a second flow surface facilitates flow of material between the wing surface and the wing side surface. Since such a configuration prevents material from staying between parallel kneading segments, impurities are prevented and will not mix into normally kneaded material.

Abstract: A kneading segment includes plural wing portions integrally formed along an axis such that angles, around the axis, of the plural wing portions are shifted. At a part of a leading end of each wing portion where a wing leading end surface and a wing surface connect with each other, a first flow surface facilitates flow of material between the wing leading end surface and the wing surface. At a part of a base end of each wing portion where a wing surface and a wing side surface of another wing portion adjacent to each wing portion connect with each other, a second flow surface facilitates flow of material between the wing surface and the wing side surface. Since such a configuration prevents material from staying between parallel kneading segments, impurities are prevented and will not mix into normally kneaded material.

Abstract: In an extruder or a kneader, load (torque T) values on an input shaft portion of a screw shaft are detected by a load detector installed on the input shaft portion, then an overload condition is determined from a load mean value (Ta) and a load amplitude value (Tw) of the detected load values, and the issuance of an “abnormal” alarm and/or the stop of rotation of the screw shaft are (is) performed when an overload duration time (to) of maintaining the overload condition exceeds a set time (ts). In this way the screw shaft is protected from fatigue fracture caused by application thereto of such a load as does not exceed a designed mechanical strength but causes fatigue fracture.

Abstract: One object of the present invention is to provide a kneader which can diminish wear of screws and a barrel while preventing the manufacturing process for the screws and barrel from becoming complicated. In this kneader, a pair of screws are rotated about respective axes thereof to knead a material to be kneaded which is introduced into a kneading space formed within a barrel. Each screw has such a shape generating deflection in a predetermined direction perpendicular to an arranged direction of the axes of the pair of screws during kneading of the material to be kneaded, and the kneading space has a shape such that a pair of accommodating spaces which accommodate each of the screws respectively are connected together so as to overlap each other partially in the radial direction, each accommodating space being formed in such a manner that the diameter thereof in the predetermined direction in which there occurs deflection of each screw is larger than in any other direction.

Abstract: In an extruder or a kneader, load (torque T) values on an input shaft portion of a screw shaft are detected by a load detector installed on the input shaft portion, then an overload condition is determined from a load mean value (Ta) and a load amplitude value (Tw) of the detected load values, and the issuance of an “abnormal” alarm and/or the stop of rotation of the screw shaft are (is) performed when an overload duration time (t0) of maintaining the overload condition exceeds a set time (ts). In this way the screw shaft is protected from fatigue fracture caused by application thereto of such a load as does not exceed a designed mechanical strength but causes fatigue fracture.

Abstract: One object of the present invention is to provide a kneader which can diminish wear of screws and a barrel while preventing the manufacturing process for the screws and barrel from becoming complicated. In this kneader, a pair of screws are rotated about respective axes thereof to knead a material to be kneaded which is introduced into a kneading space formed within a barrel. Each screw has such a shape generating deflection in a predetermined direction perpendicular to an arranged direction of the axes of the pair of screws during kneading of the material to be kneaded, and the kneading space has a shape such that a pair of accommodating spaces which accommodate each of the screws respectively are connected together so as to overlap each other partially in the radial direction, each accommodating space being formed in such a manner that the diameter thereof in the predetermined direction in which there occurs deflection of each screw is larger than in any other direction.

Abstract: An extruder includes a barrel and a kneading screw extending through the barrel in a rotatable fashion. The kneading screw is provided with a devolatilization portion. The devolatilization portion includes a kneading flight that is twisted in a direction for transferring a material downstream. The kneading flight kneads the material while transferring the material downstream and separates a volatile component from the material. Impregnation sections, which allow the kneading chamber to be impregnated with the material, are respectively disposed adjacent to an upstream side and a downstream side of the devolatilization portion so that the air-tightness of the devolatilization portion of the extruder is maintained. Accordingly, an efficient devolatilization operation of the material is achieved.

Abstract: An extruder includes a barrel and a kneading screw extending through the barrel in a rotatable fashion. The kneading screw is provided with a devolatilization portion. The devolatilization portion includes a kneading flight that is twisted in a direction for transferring a material downstream. The kneading flight kneads the material while transferring the material downstream and separates a volatile component from the material. Impregnation sections, which allow the kneading chamber to be impregnated with the material, are respectively disposed adjacent to an upstream side and a downstream side of the devolatilization portion so that the air-tightness of the devolatilization portion of the extruder is maintained. Accordingly, an efficient devolatilization operation of the material is achieved.

Abstract: The bearing cooling device causes cooling media to flow into the interior of a journal bearing 8 for supporting a shaft part 7 by lubrication of high viscous fluid and the interior of the shaft part 7 to cool the shaft part 7 and the bearing 8. At this time, cooling medium temperature of the bearing 8 is set to be higher than cooling medium temperature of the shaft part 7. It is constituted so that the cooling medium passes the cooling medium passage and thereafter passes the cooling medium passage internally of the bearing. A heated medium supply device for supplying a heated medium to each cooling medium passage may be provided. The bearing cooling device is used suitably for a gear pump.

Abstract: In a knife used in an underwater cutting granulating device for cutting and granulating a fused resin extruded from a die to a water chamber by a cutter rotated in the state where the knife is opposed to the die, the knife of the cutter has a convex guide surface for guiding a water flow in the direction of drawing it toward the die, which is formed on the surface opposite to the surface facing the die and a curved concave guide surface on the side facing the die.

Abstract: To provide a gear pump for carrying high viscous liquid, which keeps a bearing in a free state and enhances reliability relative to a leakage of cooling medium and a leakage of molten resins. The gear pump in which a pair of gear rotors 2 are supported on a body 1 of the gear pump through a bearing 6, a cover for preventing the bearing 6 from being slipped out is secured to the body 1, and a temperature adjusting medium passage 20 is formed in the bearing 6, wherein an inlet pipe 28 and an outlet pipe 29 to the temperature adjusting medium passage 20 are connected to the axial outer end of the bearing 6, an intermediate plate 10 is interposed between the axial outer end of the bearing 6 and the cover 11, the intermediate plate 10 being provided with an insert hole 31 for the inlet pipe 28 and the outlet pipe 29, the cover 11 being provided with a guide portion 32 having the inlet pipe 28 and the outlet pipe 29 loosely fitted therein to guide them to outside.

Abstract: A continuous kneader is disclosed wherein rotors each having a material feed section and a kneading section on the outer peripheral surface thereof are inserted rotatably into a chamber while being supported at both axial ends thereof, the said chamber having a material supply port at one end portion thereof, a discharge section is formed at an end portion of each rotor opposite to the material supply side for scraping out the material after kneaded by the rotor radially outwards of the rotor, and a discharge port for discharging the kneaded material thus scraped out in the discharge section of each rotor to the exterior of the chamber is formed in the opposite end portion of the chamber so as to be open radially outwards of the rotor, the discharge section of each rotor having on its outer peripheral surface a twist flight which is inclined in a direction of extruding the kneaded material to the opposite end side of the chamber with rotation of the rotor.

Abstract: To provide a gear pump for carrying high viscous liquid, which keeps a bearing in a free state and enhances reliability relative to a leakage of cooling medium and a leakage of molten resins.

Abstract: The bearing cooling device causes cooling media to flow into the interior of a journal bearing 8 for supporting a shaft part 7 by lubrication of high viscous fluid and the interior of the shaft part 7 to cool the shaft part 7 and the bearing 8. At this time, cooling medium temperature of the bearing 8 is set to be higher than cooling medium temperature of the shaft part 7. It is constituted so that the cooling medium passes the cooling medium passage and thereafter passes the cooling medium passage internally of the bearing. A heated medium supply device for supplying a heated medium to each cooling medium passage may be provided. The bearing cooling device is used suitably for a gear pump.

Abstract: In a knife used in an underwater cutting granulating device for cutting and granulating a fused resin extruded from a die to a water chamber by a cutter rotated in the state where the knife is opposed to the die, the knife of the cutter has a mountain-shaped guide surface for guiding a water flow in the direction of drawing it toward the die, which is formed on the surface opposite to the surface facing the die. In this knife, more specifically, the transition angle B° from the front surface to the back surface and the transition angle D° from the back surface to the rear surface are set so as to be 150°≦(B+D)/2≦180°. The maximum distance A from the cutter surface to the inner surface and the maximum thickness C of the knife are set so as to be C≦1.2A.

Abstract: A kneaded product of a desired state of kneading is available by causing a material to be kneaded to flow in tip clearances between rotor segments 1b and 1b of screw sets 1 and 1 and an inner wall surface of a chamber 4 while rotating the screw sets 1 and 1 provided to the right and the left of the chamber 4, and imparting a shearing force for dispersion. Each rotor segment 1b has a plurality of kneading blade 7 having different distances between the segment center and the top, so as to achieve a plurality of tip clearances different at least in the circumferential direction when the segment center is aligned with the chamber center.