File:Chemistry of pulp and paper making (1920) (14780070101).jpg

Identifier: chemistryofpulpp00suteuoft (find matches)
Title: Chemistry of pulp and paper making
Year: 1920 (1920s)
Authors: Sutermeister, Edwin, b. 1876
Subjects: Paper making and trade Wood-pulp
Publisher: New York Wiley
Contributing Library: Earth Sciences - University of Toronto
Digitizing Sponsor: MSN

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sults. The pig-ment is set free under such conditions that it is ground intothe pores of the fibres and it is then almost impossible to w^ashout enough of it so that a good color can be obtained. If thepapers are disintegrated and then diluted in the washer beforemixing with the detergent much better stock will result becausethe separated ink is then in such a state that it tends to riseto the surface and can be more readily removed by the washers.It is evident, then, that a method of disintegration which tendsto pull the ink from the surface of the paper is superior to onewhich tends to grind it into the fibres. Such a procedure has been embodied in the Winestock process OLD PAPERS 91 for the recovery of old papers. The apparatus used is shown insectional view in Fig. 6 of a machine driven by a direct connectedsteam turbine, M. The essential features are a propeller tubeB at the bottom of a cylindrical tank A which is mountedwithin a chamber H; through the horizontal part of the pro-
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FlG. 6. WiNESTOCK DeFIBERING MACHINE Courtesy of Castle, Golthcil &- Overton peller tube extends a shaft which turns at 2000 revolutions perminute and upon which are mounted two propellers of differentpitch. Between the propellers is a bafifle plate A to stop anyinclination toward a rotary motion of the stock in the tube. The papers to be treated are opened up and dusted in a rail-road duster or its equivalent and then soaked in a tank of waterat about 160° F. either \\ath or without the addition of sodaash or other detergent. They are then charged into the cham- 92 RAGS, ESPARTO, STRAW, BAMBOO ber H, together with any other additional detergents desired,such as a mixture of soda ash, caustic soda or a soap composedof tallow, soda ash, caustic potash and silicate of soda. Thechamber H being full the stock overflows into the cylinder Aand is circulated by the propellers back to the chamber Hwhich it enters tangentially and through which it circulates toagain enter A. The basic ide

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