Abstract: A flotation apparatus F includes a tank 1 for receiving a liquid raw material, and introduces air into the tank 1 to generate bubbles for adsorbing print ink in the liquid raw material to the bubbles, thereby floating and separating the print ink. The flotation apparatus F includes a circulating device for circulating the liquid raw material by raising and then lowering the liquid raw material in the tank 1, an air supply tube 4 for supplying air into the tank 1, and an agitating member 5 provided in the tank 1 for taking the air from the air supply tube 4 and agitating the air for forming the air into fine bubbles. The agitating member 5 has a rotary shaft 51 held horizontally and a plurality of members 52 horizontally separately provided around an outer periphery.

Abstract: A flotation apparatus F includes a tank 1 for receiving a liquid raw material, and introduces air into the tank 1 to generate bubbles for adsorbing print ink in the liquid raw material to the bubbles, thereby floating and separating the print ink. The flotation apparatus F includes a circulating device for circulating the liquid raw material by raising and then lowering the liquid raw material in the tank 1, an air supply tube 4 for supplying air into the tank 1, and an agitating member 5 provided in the tank 1 for taking the air from the air supply tube 4 and agitating the air for forming the air into fine bubbles. The agitating member 5 has a rotary shaft 51 held horizontally and a plurality of members 52 horizontally separately provided around an outer periphery.

Abstract: A kneader includes a casing with a papermaking material supply opening and a papermaking material outlet located below the papermaking material supply opening; at least first, second, third and fourth rotational shafts provided inside the casing; first blades attached to the first rotational shaft; second blades attached to the second rotational shaft; third blades attached to the third rotational shaft; and fourth blades attached to the fourth rotational shaft. The first rotational shaft and the second rotational shaft are located at the same height and are arranged parallel to each other, and the third rotational shaft and the fourth rotational shaft are located at the same height and are arranged parallel to each other. The third rotational shaft is located under the first rotational shaft and the fourth rotational shaft is located under the second rotational shaft, respectively.

Abstract: A doctor device includes a blade contacting a roll, a blade holder for holding the blade, and a moving device for moving the blade in such a direction that the blade moves toward the roll or away from the roll. The blade includes a first blade edge located on a side contacting the roll and a second blade edge located on a side opposite to the first blade edge. The blade holder includes an upper member supporting a portion of an upper surface of the blade, and a lower member supporting a portion of an under surface of the blade. The blade is held by the upper member and the lower member in such a state that the first blade edge of the blade projects from the blade holder, and the second blade edge of the blade does not contact the blade holder.

Abstract: A papermaking screen device includes a tank for receiving a papermaking material, the tank having an inlet, a refining outlet, a foreign material outlet, a first chamber and a second chamber formed outside the first chamber; a cylindrical screen provided inside the tank and dividing the tank into the first and second chambers so that the first chamber is formed inside the cylindrical screen, and the second chamber is formed outside the cylindrical screen, the cylindrical screen having a cylindrical shape and opening portions on an lateral side of the cylindrical screen; an agitating member provided in the first chamber; and a vibration member contacting the cylindrical screen for vibrating the cylindrical screen in such a range that the cylindrical screen does not contact the agitating member. The inlet and the foreign material outlet face the first chamber, and the refining outlet faces the second chamber.

Abstract: A kneader includes a casing with a papermaking material supply opening and a papermaking material outlet located below the papermaking material supply opening; at least first, second, third and fourth rotational shafts provided inside the casing; first blades attached to the first rotational shaft; second blades attached to the second rotational shaft; third blades attached to the third rotational shaft; and fourth blades attached to the fourth rotational shaft. The first rotational shaft and the second rotational shaft are located at the same height and are arranged parallel to each other, and the third rotational shaft and the fourth rotational shaft are located at the same height and are arranged parallel to each other. The third rotational shaft is located under the first rotational shaft and the fourth rotational shaft is located under the second rotational shaft, respectively.

Abstract: This invention provides a screen apparatus having an enhanced capacity for separating foreign matter from fibers of an acceptable quality in paper-making material.

Abstract: A screen device includes a screen dividing a tank into a first chamber and a second chamber for sorting a foreign material in a papermaking material, a first papermaking material supply passage for supplying the papermaking material to the first chamber from the upper side, and a second papermaking material supply passage for supplying the papermaking material to the first chamber from the lower side. The papermaking material passing through the screen is ejected from a middle area of the screen. The screen device also includes an agitating member located inside the first chamber for agitating the papermaking material, and a foreign material outlet passage communicating with the first chamber through a foreign material outlet provided on a side face of the screen. Therefore, the screen device can improve the sorting effect between the foreign material and a good-quality fiber in the papermaking material.

Abstract: It is an object of the present invention to provide a screen apparatus having a function of dilute water which is suitable for a centripetal type screen which rotates inside the screen. A screen apparatus A comprises a tank 1 for receiving paper raw materials including an entrance 1c for the paper raw materials, a selection exit 1d and a foreign matter exit 1e, a cylindrical screen 2 fixed in the tank 1 and dividing the tank 1 into a primary chamber 1a and a secondary chamber 1b, and a stirring member 3 which is rotatably supported inside the screen 2 for stirring the paper raw materials.

Abstract: A screen apparatus for separating a foreign material from a papermaking material includes a tank for receiving the papermaking material; a screen dividing the tank into a primary chamber and a secondary chamber, a papermaking material supply passage for supplying the papermaking material into the tank, a foreign material discharge passage for discharging the foreign material in the papermaking material, a papermaking material discharge passage for discharging the papermaking material passing through the screen, a foil disposed in the primary chamber for stirring the papermaking material, and a dilute water introducing passage for introducing dilute water into the primary chamber. The dilute water introducing passage has a tip end tilted toward a rotational center of the foil in a direction that the foil rotates. The dilute water introducing passage has a tip opening section at the tip end facing a side of the foil.

Abstract: A screen device includes a tank for receiving a papermaking raw material; a screen with a cylindrical shape for dividing the tank into first and second chambers; a papermaking raw material supplying path for supplying the papermaking raw material to the tank; a foreign material discharging path for discharging the papermaking raw material containing a foreign material; a papermaking raw material discharging path for discharging the papermaking raw material passing through the screen to outside the tank; a cylindrical member disposed in the first chamber to face the screen; a plurality of first foils provided on the cylindrical member; and an extending member extending from a side surface of the cylindrical member. A plurality of second foils extends downwardly from an outer edge of the extending member. The first foil has a projecting portion projecting from the cylindrical member and a hanging member situated away from the cylindrical member.

Abstract: A screen device includes a screen for receiving papermaking raw materials and a stirring member facing an outer surface or inner surface of the screen and rotating to wash a mesh of the screen, so that foreign materials are removed from the papermaking raw materials. The screen includes slits elongated in a longitudinal direction formed by elongated members. The slit is defined by a first screen surface and a second screen surface facing each other. Recess portions are formed at least in the first screen portion surfaces, and each disposed at a position closer to a narrowest facing portion between the first and second screen surfaces relative to an outlet of the first and second screen surfaces through which the papermaking raw materials flow out.

Abstract: A refiner for separating and beating a material includes a conical type stationary shell including a first beating section; a ring-shaped stationary disc provided on an outer edge of the conical type stationary shell and including a second beating section; a rotational shaft; a conical type rotor attached to and supported by the rotational shaft including a third beating section facing the first beating section to create a gap between the first beating section and the third beating section for the material to pass through; and a ring-shaped rotor disc provided on an outer edge of the conical type rotor and including a fourth beating section facing the second beating section to create a gap between the second beating section and the fourth beating section for the material to pass through.

Abstract: A screen apparatus includes a tank, a first cylidrical screen disposed inside the tank to form a first chamber, and a second cylidrical screen disposed outside the first cylindrical screen. The second cylindrical screen defines a second? chamber facing the first cylindrical screen and having upper and lower portions communicating with an inlet portion, and second? chamber. A connection member has a groove facing the second? chamber at an intermediate portion of the second cylindrical screen, and a passage communicating with the groove for discharging a paper stock. The paper stock flows to the second? chamber through the upper and lower portions. A part of the paper stock passing through the first and second cylindrical screens is discharged through first and second selection outlet portions, and a part of the paper stock not passing throught the first and second cylindrical screens is discharged through the passage.

Abstract: A papermaking screen device includes a tank for receiving papermaking raw materials; an agitator provided in the tank; a screen provided in the tank; and a partition wall for dividing the screen and the tank. The tank includes a first chamber located at an outer side of the screen for receiving the papermaking raw materials; a second chamber located at an inner side of the screen; and a third chamber located at the outer side of the screen for discharging the papermaking raw materials. The first chamber is connected to a supply passage for supplying the papermaking raw materials into the tank and a first discharge passage for discharging the papermaking raw materials. The second chamber is connected to a second discharge passage for discharging the papermaking raw materials. The third chamber is connected to a discharge passage for discharging the papermaking raw materials to an outside of the tank.

Abstract: A papermaking strainer removes a foreign material from papermaking raw materials. The papermaking strainer includes a strainer member having a plurality of first openings; a strainer supporting member having a plurality of second openings; and a fastener device for fixing the strainer members to the strainer supporting member. The strainer supporting member contacts and supports the strainer member. The first openings are communicated with the second openings, and the strainer member is arranged at an inflow side of the papermaking raw materials. When the papermaking strainer is damaged or worn down in use, it is possible to easily replace the strainer member for repair.

Abstract: A refiner includes a driving source, a rotating shaft rotated by the driving source, a conical-type rotor attached to the rotating shaft, stators disposed in a casing to face the conical-type rotor. The conical-type rotor has a substantially cone-shape first conical portion and a substantially cone-shape second conical portion, and bottom portions of the first and second conical portions are joined together. The rotating shaft passes through top portions of the first and second conical portions, and the conical-type rotor is attached to the rotating shaft.

Abstract: It is an object of the present invention to provide a screen apparatus having a function of dilute water which is suitable for a centripetal type screen which rotates inside the screen. A screen apparatus A comprises a tank 1 for receiving paper raw materials including an entrance 1c for the paper raw materials, a selection exit 1d and a foreign matter exit 1e, a cylindrical screen 2 fixed in the tank 1 and dividing the tank 1 into a primary chamber 1a and a secondary chamber 1b, and a stirring member 3 which is rotatably supported inside the screen 2 for stirring the paper raw materials.

Abstract: A dissociating apparatus of papermaking raw material includes a rotary drum for receiving the papermaking raw material therein. The rotary drum has an engaging portion on an inner wall thereof for engaging the papermaking raw material. The dissociating apparatus also includes a rotary vane disposed inside the rotary drum for hitting the papermaking raw material falling from the engaging portion. In a method of dissociating the papermaking raw material, the raw material on the rotary drum is hit by the rotary vane to collide with the inner surface of the rotary drum, and falls on a bottom surface of the rotary drum to collide therewith. Thus, the raw material is properly dissociated.

Abstract: It is an object of the present invention to provide a screen apparatus for increasing a selecting processing amount of paper stock. The screen apparatus A includes a tank 10, a first cylindrical screen 1, a second cylindrical screen 2 fixedly provided in the tank 10 outside of the first cylindrical screen 1, a stirring member 3 for stirring the paper stock, a connection member 4 having an opening which is in communication with a second′ chamber 1B′ formed between an inner side of the second cylindrical screen 2 and an outer side of the first cylindrical screen 1, and a paper stock discharging passage 5 which is in communication with a passage of the connection member 4 and which has a passage through which the paper stock in the passage is discharged out from the tank 10. The connection member 4 is mounted to the second cylindrical screen 2 and is in communication with the opening. The connection member 4 has a passage for discharging the paper stock in the second′ chamber 1B′.