| Patent Number |
Title Of Patent |
Date Issued |
| 6338412 |
Cylindrical screen, particularly for paper pulp |
January 15, 2002 |
| Cylindrical screen, particularly for paper pulp, of the type comprising at least one filtering element (10) positioned between two flanges (1, 2) by means of a number of bars (3). The filtering element is composed by wires (10) placed side by side and held by rings (11). This filtering e |
| 6197153 |
Method for de-inking paper pulp from recycled paper |
March 6, 2001 |
| The method for de-inking paper pulp produced by the reduction to pulp, with water, of old papers of various qualities according to which a stream of air bubbles (C) is sent through the flow (E.sub.2, S.sub.2, E.sub.3, S.sub.3) of pulp at least once, is characterized by the fact that a |
| 5979665 |
Paper-pulp deinking method and equipment to implement this method |
November 9, 1999 |
| Equipment for deinking paper pulp, wherein the batch of pulp to be deinked is made to circulate to move from top to bottom whereas the air bubbles are introduced at least in the lower part and move from bottom to top, characterized in that the pulp descends from top to bottom while being |
| 5735472 |
Rotating drum comprising screening and mashing chambers for separating paper fibers and contamin |
April 7, 1998 |
| Method for separating paper fibers and contaminants for mixtures containing water, fibers, contaminants, paper or cardboard pellets, wherein the mixture is subjected firstly to a screening, secondly to a mashing and then thirdly to a further screening with addition of water, subsequent t |
| 5697503 |
Screening sieves, notably for paper pulp |
December 16, 1997 |
| Sieve with slots or holes, made from a U-shaped section, constituted by a stack of identical circles, each circle (1, 1') being made from a tapered U-shaped section of which the two ends are welded or mechanically connected to one another, characterized in that this stack of circles (1, |
| 5650044 |
Paper-pulp deinking method and equipment to implement this method |
July 22, 1997 |
| A method for deinking paper pulp, wherein the batch of pulp to be deinked is made to circulate to move from top to bottom whereas the air bubbles are introduced at least in the lower part and move from bottom to top, characterized in that the pulp descends from top to bottom while being |
| 5645724 |
Rotor-equipped cylindrical screens |
July 8, 1997 |
| A cylindrical screen within which rotates a rotor fitted with means causing pressure variations and/or turbulence. The rotor (1) consists of one or several cylindrical surface segments (2) which when geometrically developed are right triangles of which the two perpendicular sides (3, 4) |
| 5624609 |
Enhancements to the air injection devices in a paper pulp flow for de-inking thereof |
April 29, 1997 |
| An air injector for the foaming of paper pulp, comprised of a hollow cylindrical tube inside which is arranged a cylindrical bore (3) leading into a convergent portion and a divergent portion (2a, 2b, 2c), said cylindrical bore being occluded by a stopper fitted with holes (8) provid |
| 5476178 |
Rotor for pressurized hydrodynamic purification of paper pulp and equipment fitted with this rot |
December 19, 1995 |
| The invention concerns a rotor for the pressurized, hydrodynamic purification of paper pulp from old papers in known purifying equipment comprising a cylindrical screen, characterized in that it comprises a generally cylindrical case extending along a longitudinal axis of rotation 6 |
| 5407538 |
Device for separating a mixture of paper pulp and contaminants |
April 18, 1995 |
| An apparatus for separating out the contaminants in a pulp slurry in which the housing of the separator is divided by a perforated screen into an inlet and an outlet section. The inlet section of the separator has a rotating blade mixing means to propel the liquid mixture in the pulp |
| 5293677 |
Process of making a cylindrical slotted sieve for paper pulp strainer |
March 15, 1994 |
| Cylindrical sieve for paper pulp strainer of the type of thin sheetmetal is formed by juxtaposition of U-shaped sectional elements (2) made from a metal strip. The element (2) has a first flange (3), a bottom (4), followed by a second flange (5) bent over toward the exterior of the U |
| 5255791 |
End rim of cylindrical sieve for paper pulp strainer and classifier and process, of making it |
October 26, 1993 |
| Process of making and mounting an end rim of a cylindrical sieve (1) for paper pulp strainer and classifier characterized by the fact that the rim is of one piece, molded directly on the end of the cylinder with a hardenable or thermosetting plastic material. |
| 5182031 |
Process and device for deaeration of liquids |
January 26, 1993 |
| The device comprises a closed chamber (1) equipped with an inlet pipe (3) for the aerated liquid, an outlet pipe (4) for the deaerated liquid, and an air evacuation pipe (5); and a rotor having a shaft extending into the chamber. The shaft carries means (7) for centrifugation of the liqu |
| 5128028 |
Sieve for paper pulp strainer and classifier |
July 7, 1992 |
| Sieve for paper pulp strainer and classifier of the kind formed by the juxtaposition of elements of U-shaped cross section comprising a perforated flat bottom (2) and two sidewalls (3) characterized in that the elements (1) of U-shaped cross section are disposed so as to form a notab |
| 4938423 |
Paper pulp beater |
July 3, 1990 |
| Paper pulp beater of the type having a cylindrical vat, open at its upper part, and closed by a bottom equipped with a rotor over which rises a vertical shaft extending along the central axis of revolution of the vat in the interior of the vat, the lateral wall of the vat having a device |
| 4915821 |
Apparatus for treatment of old printed papers with short and long fiber separation |
April 10, 1990 |
| Apparatus for treating of old printed papers includes a recycling conduit for the thickening waters of a long fiber fraction upstream of the fractionation apparatus to the pulping and pre-purification apparatus, and a reservoir for the recovery of thickening waters of a short fiber f |
| 4898665 |
Screens for paper pulp purifiers |
February 6, 1990 |
| A screening device is provided with a screening element having a plurality of perforations going therethrough. Each perforation has an inlet and an outlet.The screen element includes a plurality of step-type obstacle members positioned in the vicinity of the inlets of the perforations to |
