Back to results
US 5,044,179 AGranted
Stabilizing pressure and flow conditions in a screening apparatus
AssigneeKamyr, Inc.
InventorFinn Jacobsen
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKamyr, Inc.
InventorFinn Jacobsen
Estimating the term…
A method of stabilizing pressure and flow conditions in a screening apparatus for treating a pulp is described, the pulp being supplied continuously to the screening apparatus through an inlet and passed through a pulp space along a screen of a screen body and discharged continuously through an outlet, said screen body being moved axially with a forward-going movement during an extraction phase and a backward-going movement during a backflushing phase. The flowrate of the pulp through, and the pressure conditions in, the treating zone of the screening apparatus are controlled by altering the volume at the inlet end and outlet end of the screening apparatus during the movement of the screen body. A screening apparatus for carrying out the method is also described, which comprises a cylinder housing with a piston movable to and fro therein by means of a drive device, said piston defining a first chamber filled with liquid and a second chamber filled with pulp, said pulp chamber being in direct communication with the pulp inlet. Furthermore, a connection channel filled substantially with liquid is disposed between the liquid chamber and an outlet zone of the pulp space located at the outlet for treated pulp.
An apparatus for separating liquid from a fibrous cellulosic pulp mixture comprising a vessel having an axis, a screen body mounted inside said vessel for movement to and fro along said axis, a drive device for effecting said movement, said vessel having at one end an inlet for pulp to be treated and at an opposite end an outlet for treated pulp, said body and said vessel including between them a space along which the pulp moves in passing from said inlet to said outlet at least partially in response to a portion of the movement of said screen body in said vessel, said screen body defining a space to receive liquid extracted through said screen body, said vessel having a liquid outlet, said vessel having at one end a cylindrical housing and a piston movably mounted in said housing so as to define a first chamber for a liquid and a second chamber to be filled with the pulp mixture, said second chamber being in direct communication with said inlet for pulp, a connection channel for being filled substantially with liquid and disposed to extend between said first chamber and adjacent said outlet for treated pulp.
Screening apparatus for the treatment of fibrous cellulosic pulp, comprising:
Dependencies are inferred from the claim text.