PULP YIELDS FOR VARIOUS PROCESSES AND WOOD SPECIES.
FOREST PRODUCTS LAB MADISON WIS
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Density, fiber length, and typical pulp yields, as obtained primarily by kraft and sulfite processes, from many softwood and hardwood species grown in the United States are tabulated. The yield of pulp expressed as a percentage by weight on the moisture-free basis obtained by digesting wood by one of the chemical processes is dependent to a large extent on the chemical composition of the wood. A notable difference between softwoods and hardwoods is observed in their fiber length. In general, softwoods produce longer fibered pulps than hardwoods and are preferred for most kinds of paper for this reason. The fiber length, among other structural characteristics of fibers, has an influence on the strength and other properties of the pulp and of the paper in which the pulp is used. Author