KRAFT PULPING OF 2ND GROWTH JACK PINE

The author determines yield and quality of unbleached kraft pulps from second-growth jack pine trees by evaluating tree samples for kraft pu lping fiber, and hand sheet properties. Kraft pulp fibers from juvenil e wood and top wood samples were finer and shorter than their mature w ood counterparts and gave denser sheets which were smoother and less p orous. These differences in fiber dimensions offer new opportunities t o make pulps with a range of properties wider than that currently avai lable to papermakers.