a high-yield pulping process that combines a mild chemical treatment with mechanical defibering. 
short for the Sustainable Forestry Initiative, a program that integrates the perpetual growing and harvesting of trees with the protection of wildlife, plants, soil, and water quality.
the solids removed from the effluent stream of a pulp or paper mill.
the molten inorganic chemicals that flow from the bottom of the kraft recovery boiler.
the pulping chemicals at the end of the cook. Also known as black liquor.
a chemical pulping process that uses calcium bisulfite or other soluble salts of sulfite under acid conditions to dissolve the lignin and release cellulose fibers.