Abstract:
A defibrating unit includes a rotating unit and a fixing unit. The rotating unit and the fixing unit are arranged so as to be apart from each other with a gap therebetween in an intersecting direction that intersects with a rotating shaft of the rotating unit. The rotating unit includes a surface that stands up along an axial direction of the rotating shaft and that is arranged on a side section in the axial direction and arranged at a side where a defibration object is introduced. The fixing unit includes a plurality of plates that are layered in the axial direction, and the plates has a plurality of convexities that protrude at a side facing the rotating unit.
Abstract:
A sheet manufacturing apparatus includes a defibrating unit and a sheet forming unit. The defibrating unit includes a rotating unit and a housing, and is configured to carry out a dry-type defibrating process by rotating the rotating unit. The housing includes a cover portion and a fixing unit attached to the cover portion and spaced apart from the rotating unit in a direction perpendicular to an axial direction of the rotating unit so as to form a gap between the rotating unit and the fixing unit. The sheet forming unit is configured to form a sheet by accumulating defibrated material. The rotating unit includes a rotor having protruding sections on an outer circumference of the rotor, and a feeding blade arranged on a side section of the rotor on a side of an input section for the defibration object and configured to generate a flow of air.
Abstract:
The disclosure relates to a process and device for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions which includes a primary and secondary stage. In order to improve ash removal, a washing process is interposed between the primary and secondary stages.
Abstract:
A method and apparatus for effecting low-pressure separation from a suspension of reclaimed wastepaper of both cellulose pulp fibers and light impurity particles having a specific gravity less than that of the pulp fibers, characterized by the use of a wastepaper cleaner operable in the low-pressure hydrocyclone mode to deposit the heavier pulp fibers at the bottom of a chamber and to establish an upward flow of the lighter particles in a vertical vortex in the central portion of the chamber. The invention also includes a method and apparatus for separating the cellulose pulp fibers from a reclaimed wastepaper suspension by a combined high-pressure drop low-pressure drop separation process, use being made of a high-pressure drop hydrocyclone separator that is connected in unitized construction with the low-pressure wastepaper cleaner. Finally, an improved waste-paper cleaning system is disclosed including in combination with the highpressure drop low-pressure drop separator a further low-pressure wastepaper cleaner for effecting second-stage cleaning of the lighter separated impurity particles, and a further hydrocyclone separator for effecting second-stage cleaning of the heavier separated impurity particles.
Abstract:
There is described a pulp screen having an elongated cylindrical housing with an inlet end and a discharge end, a concentric hollow impeller shaft within the housing, a concentric cylindrical screen about the shaft and spaced from the housing walls to provide an accepted stock discharge space; there are radially extending impeller vanes on the shaft for imparting cylindrical force to the pulp stock, and circumferentially extending plates are provided between the vanes near the discharge end flaring outwardly downstream of the shaft to reduce the effective space between the impeller and the inner surface of the screen thereby increasing the velocity of the stock passing in the zone near the discharge zone. There is a first discharge for the high density tailings and a second adjacent discharge for the lesser density tailings which can be recirculated.
Abstract:
Centrifugal separation of heavy and light impurities from waste paper stock in a centrifuge chamber is effected by removing the heavy impurities at the outer perimeter of rotation of the mass and extracting light impurities through an outlet drawing from the center of the mass in the opposite direction from recovery of stock from the mass. In a typical separator unit a cylindrical chamber receives the raw material tangentially adjacent to one end of the chamber and has a heavy impurity collection region leading off tangentially adjacent to the opposite end of the chamber, with cleaned stock outlet means at said opposite end, and a light impurities extracting outlet in the form of an axially adjustable duct leading from said one end of the chamber, such duct being open to atmosphere. Air pressure assistance for light stock extraction may be provided.
Abstract:
CLEANING EFFICIENCY IN PAPERMAKING SYSTEM CLEANERS IS ENHANCED BY FITTING ELUTRIATION UNITS ON THE REJECTS ENDS OF SYSTEM CLEANERS TO FURTHER DILUTE CLEANER REJECTS PORTIONS AND THEREBY RECOVER MORE USEABLE FIBER IN THE ACCEPTS PORTION, THE DILUTION BEING EFFECTED BY MEANS OF A STREAM OF ELUTRIATION WATER ADMITTED TO THE ELUTRIATION UNIT AT RELATIVELY LOW BUT CONSTANT PRESSURE, THE ACCEPTS AND REJECTS PORTIONS FROM SUCH CLEANERS BEING DISCHARGED FREELY INTO SPACES OF ZONES OF VACUUM OF SUBSTANTIALLY THE SAME CONDITION OF VACUUM PROVIDED BY AN UNOBSTRUCTED LIQUID-FREE CORE INTERCONNECTING SUCH SPACES.