A Study of Loblolly Pine Growth Increments—Part V. Effects of Chemical and Morphological Factors on Tensile Behavior of Paper

Peter Labosky, Geza Ifju, George A. Grozdits


Loblolly pine growth increments were divided into five fractions: two earlywood, a transition, and two latewood growth zones. Each fraction was kraft-pulped to four different time schedules, Valley beaten, made into handsheets, and investigated for tensile strength properties. Differences in tensile strength properties were related to inherent characteristics of individual tracheids. It was shown that the number of tracheids per unit volume of paper was the most important attribute to strength. Of secondary importance was the strength of the individual tracheid-to-tracheid bonds, which was influenced by residual lignin in the pulp. Using tensile energy values, the number of hydrogen bonds active in resisting tensile forces was estimated. This number was also related to the number of tracheids per unit volume as well as to residual lignin. The above variables were explained on the basis of the intraincremental chemical and anatomical properties of wood.


Loblolly pine;growth increments;handsheets;sheet tensile strength;hydrogen bonds

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