Cleaning and liquid contact with solids – Processes – Longitudinally traveling work of bar – strip – strand – sheet...
Patent
1987-03-20
1990-04-24
Pal, Asok
Cleaning and liquid contact with solids
Processes
Longitudinally traveling work of bar, strip, strand, sheet...
8156, 160 55, 160 57, 160 60, 210210, 210211, 210215, 210216, 210217, 210297, 210327, 210366, 210409, 210411, 210772, B08B 104, B08B 302
Patent
active
049191586
ABSTRACT:
The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface (2) to form a substantially continuous layer (7); and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably comprises a rotating cylinder (1) the casting surface (2) of which serves as the liquid-pervious support surface for the pulp.
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Kokkonen Seppo K.
Qvintus Harri T.
A. Ahlstrom Corporation
Pal Asok
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