Chemistry of pulp and paper making . results. 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 washout 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 is evident, then, that a method of disintegration which tendsto pull the ink fiom the surface of the paper
Chemistry of pulp and paper making . results. 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 washout 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 is evident, then, that a method of disintegration which tendsto pull the ink fiom 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 cyKndrical tank A which is mountedwithin a chamber H; through the horizontal part of the pro-. FlG. 6. WiNESTOCK DEHBERING MACHINE Courtesy 0/ Castle, Gottkeil &* 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 baffle plate K 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 with 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 siKcate of soda. Thechamber H being fuU the stock overflows into the cylinder Aand is circulated by the propellers back to the chamber Hwhich it enters tangentiaUy and through which it circulates toa
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1920
