Kraft Pulping of Second-Growth Jack Pine, 1991 Pulping Conference Proceedings
The yield and quality of unbleached kraft pulps from second-growth jack pine trees have been determined. Tree samples were separated into butt juvenile wood, butt mature wood and top wood components for kraft pulping, fiber property and handsheet evaluation.
Relative to mature wood, juvenile wood samples gave bleachable-grade and linerboard-grade pulps with lower yield, and at slightly increased alkali consumption, but with similar H factors. Kraft pulp fibers from juvenile wood and top wood samples were finer and shorter than their mature wood counter-parts, and gave denser sheets which were smoother and less porous. Tensile and burst indexes, stretch and stress-strain factors were higher, but tear index was substantially reduced.
Kraft Pulping of Second-Growth Jack Pine, 1991 Pulping Conference Proceedings