Pulping qualities of refractory vs. permeable douglas-fir heartwood Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/g158bk57j

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  • Heartwood samples of Pacific Coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) and Rocky Mountain Douglas-fir (Pseudotsuga menziesii var. glauca) were rated for relative liquid permeability, and evaluated for kraft pulping characteristics. Highly impermeable wood of the Rocky Mountain variety was termed "refractory," while the pervious wood of the Pacific Coastal variety was termed "permeable." Under constant pulping conditions, refractory Douglas-fir underwent less delignification than permeable Douglas-fir, giving higher screened rejects and lower screened yields. Pulp made from refractory Douglas-fir required less refining to achieve a given level of Canadian Standard Freeness. Handsheet properties were direct functions of fiber characteristic variations. Paper made from refractory Douglas-fir heartwood had greater sheet density, tensile strength, zero-span tensile strength, stretch, and fold endurance. Paper made from permeable Douglas-fir had greater internal tear resistance and a higher sheet brightness. No significant difference existed between the Mullen strengths of paper made from the two varieties.
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