Structural and morphological properties of lodgepole pine fibers grown under conditions of introduction stress

The results of a comparison of the structural and morphological properties of cellulose fibers obtained by the kraft method from introduced lodgepole pine (Pinus contorta var. latifolia Engelm) and Scots pine (Pinus silvestris L.) from wood samples of the same diameter are presented in terms of assessing their papermaking potential for use in production paper and cardboard. Pulp for comparison was obtained using the same kraft cooking regime. The pulp yield was 53.6 and 42.0 %, and the kappa number was 39 and 41 for lodgepole pine and Scots pine, respectively.

Measurement of the structural and morphological characteristics of the fibers was carried out on an automatic fiber analyzer L&W Fiber Tester for samples without refining and after refining in a Yokro mill up to 30 SR. For data processing, an original technology for comparative analysis of fiber properties in MS Excel was used; the data is presented in tabular form, and in the form of comparative diagrams of properties and fractional composition, as well as two-dimensional length-width diagrams for fibers.

The results showed great similarity in the structural and morphological properties of unbleached kraft pulp fibers from lodgepole and Scots pine. Compared to Scots pine cellulose, unrefined lodgepole pine fibers are slightly longer (2.098 mm vs. 2.064 mm), and wider (33.7 µm vs. 33.5 µm), and contain less fines (0.9 vs. 1.2 %).

Differences in the fractional composition along the fiber length are more noticeable for unrefined samples. The greatest differences appear for fractions of 1.7–2.3 mm, in which Scots pine has a larger proportion, due to which differences in the average fiber length appear. As a result of refining, under the influence of hydromechanical loads, the properties of lodgepole pine fibers change to a greater extent, and refining to the same SR smooths out differences in the fractional composition along the length of the fiber. The results indicate lower fiber wall strength of lodgepole pine pulp, which is associated with accelerated growth.

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