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Grinding pretreated hardwoods : experiments on quaking aspen, sweetgum, red alder, black tupelo, sugar maple, red oak, and cottonwood

Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
Publication Date
  • Chemistry


• GRINDING PRETREATED HARDWOODS: EXPERIMENTS ON QUAKING ASPEN, SIMI-GUM, RED ALDER, MACE TUPELO, SUGAR MAPLE, RED CAE, AND COTTONWOOD March 1955 (Ra-e0A-T- No. 2015 UNITED STATES APARTMENT OF AGRICULTURE L.EOREST SERVICE FOREST PRODUCTSLABORATORY L.. Madison 5, Wisconsin In Cooperation with the University of Wisconsin • GRINDING PRETREATED HARDWOODS: EXPERIMENTS ON QUAKING ASPEN, SWEETGUM, RED ALDER, BLACK TUPELO, SUGAR MAPLE, RED OAK, AND COTTONWOOD By AXEL HYTTINEN, Chemical Engineer and E. R. SCHAFER, Chemical Engineer Forest Products Laboratory,l Forest Service U. S. Department of Agriculture Summary Mild treatments with neutral sulfite solutions before grinding increased the freeness and the long fiber fraction of several hardwood groundwood pulps. Strength, brightness, and density were only slightly affected. Increasing the severity of the pretreatment increased the strength and density of the pulp and decreased the brightness and the opacity of the papers in which it was used. Chemigroundwood pulps were made that ap- proached neutral sulfite semichemical pulps in strength and could proba- bly be used for about the same purposes. The darker chemigroundwood pulps were easily brightened with a single- stage hypochlorite treatment. The experiments indicate that it may be possible to substitute hardwood chemigroundwood pulps entirely, or in part, for softwood groundwood in newsprint, book, and toweling papers and also to substitute mixtures of hardwood groundwood and hardwood chemigroundwood for softwood groundwood. -Maintained at Madison, Wis., in cooperation with the University of Wisconsin. • • Report No. 2015 -1- Agriculture-Madison Introduction The pretreatment of wood for grinding has been investigated frequently during the past century and has occasionally been practiced commercially to a limited extent. The objective has been to improve groundwood pulp for use in newsprint so that the amount of chemical pulp could be reduced

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