A method for recycling paper to produce a less white and clean office paper product for paper printing and writing, said method comprising the steps of: collecting waste papers; sorting said collected papers waste without the need to separate between the various paper grades; pressing said sorted recycled paper; pulping said sorted recycled paper by a pulper which contains water turns into a mixture; said pulper chops said sorted recycled paper into small pieces; heating said pulp mixture breaks said recycled paper down more quickly into tiny strands of cellulose or fibers to eventually, said sorted recycled paper turns into a pulp; sieving, said pulp is forced through sieves containing holes and slots of various shapes and sizes, said sieves remove small contaminants; cleaning, said pulp spinning around in large cone-shaped cylinders; heavy contaminants are thrown to the outside of the cone and fall through the bottom of the cylinder; lighter contaminants collect in the center of the cone and are removed; refining, said pulp is beaten to make said recycled fibers swell for papermaking; if said pulp contains any large bundles of fibers, said refining step separates said bundles into individual fibers; dewatering, said watery pulp enters a headbox at a paper machine, and then is sprayed in a continuous wide jet onto a huge flat wire sieve which is moving very quickly through said paper machine; on a sieve, water starts to drain from said pulp, and said recycled fibers quickly begin to bond together to form a watery sheet; said sheet moves rapidly through a series of felt-covered press rollers which squeeze out more water; said sheet, which now resembles paper, passes through a series of heated metal rollers which dry said paper’, said dried paper is wound into a giant roll and removed from the paper machine; the roll of said paper is cut into smaller rolls, or sometimes into sheets and made into said paper product.

A method for dilution for a pressure screen comprising a rotor rotating inside a screen a distance to the screen, includes supplying feeding stock into a screening zone formed in the spacing between the rotor and the screen with some of the feeding stock passing through the screen into an accept area to become accept, and the remaining feeding stock discharged into a reject area as reject flow. The amount of the dilution water added into the reject flow is 0.8 to 3.5 times the amount of the reject flow by volume. Additionally, a pressure screen comprises a dilution water adding apparatus adapted to add dilution water directly into the reject area of the pressure screen, wherein the amount of the dilution water added into the reject flow is 0.8 to 3.5 times of the amount of the reject flow by volume.

A pulp screening machine has screen extending upward from the bottom of the pulp screening machine and a rotor which rotates around the outside of the screen. An accept outlet is provided inside the screen and a pulp outlet and reject outlet are provided outside of the screen. The rotor vanes of the rotor are cantilevered from the rotor base on top of the screen into the region of the screen, with the rotor vanes not being connected to each other in the region of the screen. The rotor vanes have a rigidity adaptable for de-flaking cooperatively with the outside surface of the screen.

The present disclosure is directed to rotors for pressure screens with cylinders for screening solid contaminants from a solid slurry. The rotor includes a cylindrical hub, a plurality of foils spaced radially outward from the hub, and a plurality of struts coupling the plurality of foils to the hub. The struts include a forward edge having a forward-swept shape that creates streamlines that move contaminants and fibers from the general local flow field and those dislodged from the inner surface of the pressure screen cylinder radially inboard towards the hub. The streamlines produced by the forward-swept struts can reduce or prevent deposition of solid contaminants on the forward edge of the strut and on the leading edge of the foil. The struts can also include a release region proximate the inboard end of the strut.

A screen machine for resolving a raw material concentration phenomenon occurring in the screen machine, a casing body for the screen machine, and a screen basket. A diluent supplied through an external pipe enters a casing diluent pocket of a casing body. The diluent then enters a diluent supply path by passing through a diluent entrance of the screen basket through one or more casing diluent supply paths located in a casing upper flange and flows into a diluent pocket through a diluent exit of the screen basket by passing through the diluent supply path. The flowing diluent is sprayed onto a concentrated raw material through one or more open diluent spray holes formed on a spray surface of the diluent pocket. Since the concentrated raw material is diluted, the concentrated raw material can be lowered to a desired concentration, and problems of conventional screen machines can be resolved.

The present invention relates to a turbulence element for use with a rotor and a rotor featuring turbulence elements. The rotor is used in a screening apparatus of the pulp and paper industry. The turbulence element has a longitudinal centerline (CL); two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface and a bottom surface arranged between the leading edge and the trailing edge. The top surface is divided into a leading surface having its origin at the leading edge, and a trailing surface having its origin at the trailing edge. The leading edge and the leading surface are provided with undulations (U).

Technology for efficiently extracting fiber from a feedstock containing fiber. A subunit has a mesh drum configured as a rotatable cylinder with mesh in at least part of its surface, and a case that houses the mesh drum. The case has a first opening and a second opening that communicate with a first area, and a third opening that communicates with a second area. First screened material is supplied from the first opening to the first area. The subunit discharges from the third opening waste, which is a first component of the first screened material moved by an air current from the first area to the second area, and discharges from the second opening by an air current processing feedstock, which is a second component of the first screened material that does not pass through the mesh drum with the air current and remains in the first area.

The present invention is directed to methods and apparatus for screening a pulp suspension where the pulp suspension is directed to a screening space, where a part of the fibres in the pulp is screened using a drum-type rotor. The residual pulp suspension is then directed to a dilution space where it is mixed with recirculated pulp flow and the pulp suspension in the dilution space will be screened. Resulting preliminary reject flow is directed to a mixing space where it mixes with a dilution flow. The recirculated pulp flow is then directed back to the dilution space.

The invention relates to a blade for screens for the treatment of a fibrous suspension, said blade being mountable on a rotor of the screen. According to the invention, the blade has a curved leading edge or curved envelope of the leading edge, the curvature extending in the direction of the trailing edge, and a curved trailing edge or curved envelope of the trailing edge, said curvature extending in the same direction as the other one. The invention also relates to a screen comprising a rotor on which the disclosed blades are mounted.

The present invention relates to a turbulence element for use with a rotor and a rotor featuring turbulence elements. The rotor is used in a screening apparatus of the pulp and paper industry. The turbulence element has a longitudinal centerline (CL); two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface and a bottom surface arranged between the leading edge and the trailing edge. The top surface is divided into a leading surface having its origin at the leading edge, and a trailing surface having its origin at the trailing edge. The leading edge and the leading surface are provided with undulations (U).