Abstract
A combined sample from 22 6-year-old trembling aspen trees (Populustremuloides Michx.) was pulped by the kraft process and compared to samples from the same area of two trees aged 16 and one tree aged 53 years. Average unscreened pulp yields at permanganate No. 14 were 55.3, 59.8, and 57.4% (based on o.d. wood) for 6-, 16-, and 53-year-old samples, respectively. Breaking lengths and burst factors were similar for pulps from all three age groups at C.S.F. 300 ml. Tear factor was lower for pulp from the 6-year-old trees. These and other data from the literature indicate that aspen can be pulped by the kraft process at rotations down to at least 6 years, and the pulps resulting have yield and strength values within the range found for more mature trembling aspen.
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