A rotor unit in a vessel containing a mixture of water and particles of recycled material, comprising a rotor unit body (19); a screen plate (18) installed to the vessel; a rotor (78) connected to the rotor unit body (19) and configured to rotate inside the vessel, comprising at least two wings (81) configured to slush recycled material in a rotating action and at least two foils (82) configured to clean the screen plate (18) by rotating above the screen plate (18); a space (89) around the rotor (78) defined by a rotor body (77); pipework (21) configured to bring diluting water from outside the vessel to the space (89) around the rotor (78); wherein the rotor body (77) defining the space (89) around the rotor (78) comprises an opening (76) allowing the diluting water to pass through the opening (76) towards the mixture of water and particles of recycled material. The opening (76) at the rotor body (77) is at the same level with the lower edge of the at least two wings (81) or the at least two foils (82), wherein the diluting water is allowed to pass through the opening (76) to the screen plate (18).

An apparatus and a method for processing recycled material, comprising a first pulper (3) having an inlet (2) for receiving recycled material (1), a water inlet (26) for producing a mixture of water and particles of recycled material, a first rotor unit (R1) configured to slush recycled material and a first screen plate (18) connected to a first outlet (20) configured to extract a first portion of recycled material from the first pulper (3); a last pulper (8) having a reject washer configured to remove coarse rejected recycled material from the last pulper (8); and an upper channel (4) from the first pulper (3) to the last pulper (8), wherein the mixture of water and particles of recycled material is configured to flow over from the first pulper (3) to the last pulper (8). The apparatus comprises a of the last pulper (8) being lower than or at the same level as the first pulper (3); a lower channel (40) at the bottom of the first pulper (3) extending to the last pulper (8); and a gate (45) at the lower channel (40), configured to cause, when open, the mixture of water and particles of recycled material to flush to the last pulper (8).

An apparatus and a method for processing recycled material, comprising a first pulper (3) having an inlet (2) for receiving recycled material (1), a water inlet (26) for producing a mixture of water and particles of recycled material, a first rotor unit (R1) configured to slush recycled material and a first screen plate (18) connected to a first outlet (20) configured to extract a first portion of recycled material from the first pulper (3); a last pulper (8) having a reject washer configured to remove coarse rejected recycled material from the last pulper (8); and an upper channel (4) from the first pulper (3) to the last pulper (8), wherein the mixture of water and particles of recycled material is configured to flow over from the first pulper (3) to the last pulper (8). The apparatus comprises a of the last pulper (8) being lower than or at the same level as the first pulper (3); a lower channel (40) at the bottom of the first pulper (3) extending to the last pulper (8); and a gate (45) at the lower channel (40), configured to cause, when open, the mixture of water and particles of recycled material to flush to the last pulper (8).

A disc segment adapted to be attached to other disc segments to form a disc assembly, the disc segment being in the form of a frame, the frame comprising a left side rail and a right side rail, and a plurality of spaced apart parallel horizontally extending ribs, each disc side including a corrugated wire mesh supported by the frame ribs, the corrugated wire mesh including crisscrossing wire strands, the strands crossing perpendicularly to each other, and the wire strands extend at an angle of 45 degrees relative to its frame rib.

The present invention relates to a process for producing a nanocellulosic material based on the use of fractioning of cellulosic pulp stream from pre-treatment or mechanical defibrillation (partially refined/defibrillated pulp) in combination with stages of mechanical defibrillation, in which both the accept fraction and the reject fraction can be conveyed to stages of consistency adjustments so as to precede another distinct defibrillation stage. For example, if the accept is conveyed to a consistency adjustment preceding a second defibrillation stage while the reject is conveyed to the other independent stage of consistency adjustment to return to the first stage of mechanical defibrillation.

The present invention relates to a process for producing a nanocellulosic material based on the use of fractioning of cellulosic pulp stream from pre-treatment or mechanical defibrillation (partially refined/defibrillated pulp) in combination with stages of mechanical defibrillation, in which both the accept fraction and the reject fraction can be conveyed to stages of consistency adjustments so as to precede another distinct defibrillation stage. For example, if the accept is conveyed to a consistency adjustment preceding a second defibrillation stage while the reject is conveyed to the other independent stage of consistency adjustment to return to the first stage of mechanical defibrillation.

A cellulose nanofibrils production method comprising the steps of: identifying a desired level of cellulose nanofibrils pulp purity, partially refining pulp to produce a cellulose nanofibrils pulp purity between 5% and 15% less than the desired desired purity, and then separating out the cellulose nanofibrils from the longer fibers to produce the desired level of cellulose nanofibrils pulp purity.

A cellulose nanofibrils production method comprising the steps of: identifying a desired level of cellulose nanofibrils pulp purity, partially refining pulp to produce a cellulose nanofibrils pulp purity between 5% and 15% less than the desired desired purity, and then separating out the cellulose nanofibrils from the longer fibers to produce the desired level of cellulose nanofibrils pulp purity.

A screening apparatus (10) comprising a frame, a motor assembly (16) for vibrating the frame, at least one screen (20, 30) mounted on the frame for separating materials by size and at least one feed device (35A, 35B, 35C, 35D) provided for delivering a liquid onto said at least one screen (20, 30), said at least one feed device (35A, 35B, 35C, 35D) being adapted to deliver said liquid onto the at least one screen (20, 30) to define a laminar flow of liquid and entrained or suspended solid material over the at least one screen (20, 30).

A method for operating a screening device for cleaning a fibrous suspension includes the steps of: providing that the screening device includes a housing, a rotor arranged in the housing, and a screen; feeding the fibrous suspension and a rinsing water to the screening device; passing a portion of the fibrous suspension through the screen; discharging the portion of the fibrous suspension passing through the screen via an accepted stock discharge; and regulating, depending on a power consumption of a rotor drive, at least one of an inflow into the screening device and a cycle duration.