. Pulp and paper magazine of Canada. to be charged into thedigester than with wet chips resulting in an increasedyield of pulp per digester. Owing to the fact that 436 PULP AND PAPER MAGAZINE December 15, 1916. less water is present to dilute the cooking liquor asaving sulphur and coal is made and the almost con-stant amount of moisture in the chips greatly reducesthe troubles experienced by the acid plant in keeping,the cooking liquor at a constant strength. Questions have arisen as to the effect the drying ofchips to a moisture content of 15 per cent, would haveon the pulp produced. Sapwood
. Pulp and paper magazine of Canada. to be charged into thedigester than with wet chips resulting in an increasedyield of pulp per digester. Owing to the fact that 436 PULP AND PAPER MAGAZINE December 15, 1916. less water is present to dilute the cooking liquor asaving sulphur and coal is made and the almost con-stant amount of moisture in the chips greatly reducesthe troubles experienced by the acid plant in keeping,the cooking liquor at a constant strength. Questions have arisen as to the effect the drying ofchips to a moisture content of 15 per cent, would haveon the pulp produced. Sapwood carries more moisturethan lieartwood and is also more easily penetrated thanthe latter and it may be that this moisture thus servesto equalize the action of the cooking li(iuor on sap-wood and heartwood. Destroying the moisture balanceby drying the wood might result in an over cooked sap-wood or an under cooked heartwood. The yield andgrade of pulp from sapwood as compared to heart-wood, the penetration of the cooking liquor and the. O. F. Bryant Whose Interesting Paper Read at the Recent Meeting of the Technical Section Appears In This Issue. best cooking conditions for producing pulp from sap-wood are problems of particular interest particularlyin the utilization of slabs for the manufacture of such as these can only be solved by exhaus-tive experiments and work is now being carried out atthe Forest Products Laboratories of Canada which itis hoped will bring us to a clearer understanding ofthese matters. In conclusion I wish to acknowledge the liearty co-operation of Mr. E. S. Holloway of the Canada andGulf Terminal Railway and the valuable assistance ofmy associates at the Forest Products Laboratories ofCanada in carrying out the experimental work hereinoutlined. TO USE WASTE FROM SAW MILLS. Discoveries recently made at the United States gov-ernment forest laboratory in use of former waste ma-terial from saw mills in paper making have provedso important that pr
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