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Use of bleached cold soda pulps from certain mixtures of Latin-American hardwoods in newsprint

Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
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UNITED_ FORES STATES DEPARTMENT OF AGRICULTURE JOREST SERVICE T PRODUCTS LABORATORY Madison 5,Wisconsin In Cooperation with the University of Wisconsin USE CU BLEACHED COLD SODA PULPS FROM CERTAIN MIXTURES or LATIN-AMERICAN HARDWOODS IN NEWSPRINT December 1954 \,e) R MAY 3 1955 0 No. 2013 • • • USE OF BLEACHED COLD SODA PULPS 1 1 ROM CERTAIN MIXTURES OF LATIN-AMERICAN HARDWOODS IN NEWSPRINT 1 – By G. H. CHIDESTER, Chief, Pulp and Paper Division and K. J. BROWN, Chemical Engineer Forest Products Laboratory, 2 Forest Service U. S. Department of Agriculture Summary The high-yield, cold soda pulping process was applied to two mixtures of Latin-American hardwoods. Mixtures of equal parts of 8 hardwoods from the Yucatan forests and 4 Brazilian eucalypts were pulped under varying conditions. Quantities of the cold soda pulps, prepared under optimum conditions, were semibleached and used in newsprint papermaking trials. The major results were as follows: (1) Newsprint papers made entirely from the semibleached cold soda pulps were more than adequate in strength and brightness but were more trans- parent than standard newsprint, and the porosity was high. The opacity was improved equally as well by adding 40 percent of groundwood pulp or 15 percent of clay to the furnish containing the Yucatan cold soda pulp. These additions also decreased the strength properties of the paper, but not below those of a commercial newsprint. (2) Satisfactory cold soda pulps were obtained in yields of 84 to 91 per- cent. The pulps were bulky and slightly darker and weaker than cold soda pulps prepared from aspen and cottonwood by this process. -Presented at the Latin-American Conference on Pulp and Paper, Buenos Aires, Argentina, October 18-November 2, 1954, held under the joint sponsorship of the Food and Agriculture Organization of the United Nations, the Economic Commission for Latin America, and the Technical Assistance Administration for Latin America. 2 – Maintaine

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