Guide to the Bleaching of Pulp And Paper Processes for the Bleaching of Vegetab
Guide to the Bleaching of Pulp And Paper Processes for the Bleaching of Vegetab
James Beveridge
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After the pulp Has traversed through the series of tanks it is dis- charged into the chest at the end, from whence it flows by gravity, or it is pumped, to washers and finally to the drying machine. The return pump shown in Fig. 4 is not essential and is seldom or never used, but is added to enable the operator to pump the stock a number of tanks back, if by accident insufficient Bleach liquor has been added. Heiskanen represents that his plant occupies half the floor space of the ordinary "con...tinuous tank sys- tem" ; that he can attain a density of 7 percent stock on an average; and that by so doing the consumption of steam ancTBleach is reduced to a minimum. The consumption of power and labor is extremely low; for in the first case there is very little weight to be moved by the propellers, the columns of stock in la and Ib equalizing themselves, while in the second one man is sufficient to run the tanks from the first tank to the pulp chest. He also allows eight hours or so II for bleaching and completes this with a total tank capacity of about 200 cubic feet a ton of pulp a day.
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