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Pulping characteristics of lake states and northeastern woods

Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
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VULIPIN6 CLIAVACTEPISTICS Cif LAVE STATES AND NORTHEASTERN WOODS Revised November 1955 7s _5 ) ?qv. le75 UNITED STATES DEPARTMENT OF AGRICULTURE ,SOREST SERVICE JOREST PRODUCTS LABORATORY Madis q n5, Wisconsin lo Cooperation with the University of Wisconsin PULPING CHARACTERISTICS OF LAKE STATES AND NORTHEASTERN WOODS' By E. R. SCHAFER, Chemical Engineer J. S. MARTIN, Chemical Engineer and E. L. KELLER, Chemical Engineer Forest Products Laboratory, ? Forest Service U. S. Department of Agriculture Abstract The pulpwood consumed in the Lake States and Northeast consists largely of softwood species, but hardwood (broad-leaved) species predominate in those regions. Though inferior in some respects to the softwoods as pulpwood, the little-used hardwoods can, with proper treatment, be used for pulp to a greater extent than they are at present. High-quality, fine groundwood pulps prepared from the lower-density hard- woods, such as aspen and cottonwood, approach the quality of spruce pulps of this type, and large quantities are used in mixture with spruce. Coarse groundwood pulps from these species are used in insulating board, while fine grades are used in book and other papers. Groundwood pulps made from high-density species, such as oak and maple, are shorter fibered and have much lower strength than those made from spruce, pine, or low-density hardwoods. Some are suitable as filler pulps in printing and absorbent papers. It is possible to replace softwood groundwood entirely or in part with hardwood chemigroundwood in newsprint, book, toweling, and other ground- wood papers. Mixtures of hardwood chemigroundwood and hardwood groundwood can be made with properties comparable to those of softwood groundwood. 12resented at the Fall Meeting of the Technical Association of the Pulp & Paper Industry, Detroit, Mich., Sept. 26-28, 1946; published in TAPPI Monograph Series No.4, p.130-152, 1947. Revised Oct. 1955. 2Maintained at Madison, Wis., in cooperation with the Un

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