Apparatus for the purification of paper pulp
AssigneeE et M Lamort
InventorJean P. J. Lamort
Life of this patent
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Abstract
An apparatus for purifying paper pulp in the liquid state by screening. The apparatus comprising a cylindrical fixed screen disposed coaxially with a rotor within a housing. The rotor has longitudinal blades which, in section transverse to the rotor axis, have the general shape of an angle one side of the angle being substantially radial to the rotor and a second side inclined thereto. This apparatus is capable of both centripetal and centrifugal operation, and at concentrations of from 3 to 4%.
Claims24
An apparatus for purifying paper pulp by screening in the liquid state, said apparatus comprising a tank containing at least one fixed screen defining a first and a second chamber, the surface of said screen being a surface of revolution about an axis, said axis being the rotational axis of a rotor disposed inside the screen, said rotor having a surface of revolution substantially parallel to said surface of revolution of the screen, and having longitudinal blades disposed thereon, said blades having, in a section transverse to the axis, the general shape of an angle, one face of the blades being directed approximately radially towards the axis and the other face being inclined thereto, and first nozzle means for placing the tank in communication with a crude pulp inlet source or an outlet for purified pulp, said first nozzle means merging the crude pulp into the tank in a direction generally tangential to the direction of rotation of the rotor.
An apparatus for purifying paper pulp by screening in the liquid state, said apparatus comprising a tank containing at least one fixed screen defining a first and second chamber, the surface of said screen being a surface of revolution about an axis, said axis being the rotational axis of a rotor disposed inside the screen, said rotor having a surface of revolution substantially parallel to said surface of revolution of the screen, and having longitudinal blades disposed thereon, said blades having, in a section transverse to the axis, the general shape of an angle, one face of the blades being directed approximately radially towards the axis and the other face being inclined thereto, the ends of said blades also having cheeks thereon in the vicinity of the rotor ends.
An apparatus for purifying paper pulp by screening in the liquid state, said apparatus comprising a tank containing at least one fixed screen defining a first and a second chamber, the surface of said screen being a surface of revolution about an axis, said axis being the rotational axis of a rotor disposed inside the screen, rails on the wall of said tank on which the screen can travel by means of guiding studs, said rotor having a surface of revolution substantially parallel to said surface of revolution of the screen, and having longitudinal blades disposed thereon, said blades having, in a section transverse to the axis, the general shape of an angle, one face of the blades being directed approximately radially towards the axis and the other face being inclined thereto.
An apparatus for purifying paper pulp by screening in the liquid state, said apparatus comprising a tank containing at least one fixed screen defining a first and a second chamber, the surface of said screen being a surface of revolution about an axis, said axis being the rotational axis of a rotor disposed inside the screen, said rotor having a surface of revolution substantially parallel to said surface of revolution of the screen, and having longitudinal blades disposed thereon, said blades having, in a section transverse to the axis, the general shape of an angle, one face of the blades being directed approximately radially towards the axis and the other face being inclined thereto, the distance between the tip of a blade and the screen being equal to or less than approximately 1 mm.
Dependencies are inferred from the claim text.