Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1984-04-16
1985-10-22
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 5, 162 55, 209165, 209167, 209170, 2102211, 2102212, D21B 132
Patent
active
045486735
ABSTRACT:
A method and apparatus for deinking a fibre stock or slurry. In order to optimize the separation process the invention proposes to independently control the air injection phase, the mixing phase, and the separation phase by splitting them into separate steps.
Thus, there is provided a separation cell which is fed with slurry from an inlet. Air is introduced into the slurry before entry into the separation cell and before entering a mixing section which mixes the air and slurry before entering the separation cell. The air is introduced under pressure by way of a porous sintered sleeve, while the mixing is achieved by the provision of three turbulence discs in the preferred embodiment. Alternative turbulent generating means may be employed.
The mixing ensures contact of the ink with the air bubbles which separate out in the separation cell and rise to the surface as a foam. The foam is removed by suction, while the deinked fibre slurry is drawn off from the tank by means of a weir or stand pipe. A separation plate isolates the foam from the draw off section of the tank. It is preferred that the separation cell is divided into a plurality of cells which are fed from a respective inlet, each having a respective said air inlet and mixing section.
REFERENCES:
patent: 4214982 (1980-07-01), Pfalzer
patent: 4331534 (1982-05-01), Barnscheit
patent: 4399028 (1983-08-01), Kile et al.
McCool Michael A.
Nanda Ashok K.
Silveri Luigi
Beloit Corporation
Campbell Raymond W.
Mathews Gerald A.
Smith William F.
Veneman Dirk J.
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