The Tensile Testing of Single Wood Pulp Fibers in Air and in Water

Authors

  • Elsa M. L. Ehrnrooth
  • Petter Kolseth

Keywords:

Cellulose fibers, elastic strength, stiffness, tensile tests

Abstract

A technique for the tensile testing of single wood pulp fibers in air and in water is described. Successive loading-unloading tests with increasing loads showed that the immediate elastic recovery of the wood pulp fibers was a linear function of the removed load. The slope of the straight line is inversely proportional to the rigidity of the fibers. Creep curves were recorded at 50% relative humidity and in water. As the testing method involves the measurement of the elastic recovery, the effect on the strain of the irreversible extension of microcompressions and crimps is eliminated. The method presented in this paper may therefore be more accurate for the determination of rigidity than those which evaluate rigidity from stress-strain curves. The tensile testing technique was critically examined, with special emphasis on the reliability of the adhesive used in attaching the fibers to the testing apparatus. The calculated elastic moduli and the creep behavior agreed well with literature data.

References

Armstrong, J. P., G. H. Kyanka, and J. L. Thorpe. 1977. S2 Fibril angle-elastic modulus relationship of TMP Scotch pine fibres. Wood Sci.10(2):72-80.nBryant, G. M., and A. T. Walter. 1959. Stiffness and resiliency of wet and dry fibers as a function of temperature. Text. Res. J.29(3):211-219.nDuncker, B., and L. Nordman. 1965. Determination of the strength of single fibres. Pap. Puu47(10):539-552.nEhrnrooth, E. M. L. 1982. Softening and mechanical behaviour of single wood pulp fibres. Ph.D. thesis. University of Helsinki, Helsinki, Finland.nEl-Hosseiny, F., and D. H. Page. 1973. The measurement of fibril angle of wood fibers using polarized light. Wood Fiber5(3):208-214.nHardacker, K. W. 1962. The automatic recording of the load-elongation characteristics of single papermaking fibers. Tappi45(3):237-246.nHardacker, K. W. 1969. Cross-sectional area measurement of individual wood pulp fibers by lateral compaction. Tappi52(9):1742-1746.nHardacker, K. W. 1970. Effects of loading rate, span and beating on individual wood fiber tensile properties. Pages 201-211 in D. H. Page, ed. The physics and chemistry of wood pulp fibers. Tappi Spec. Tech. Assoc. Publ. No. 8.nHartler, N., G. Kull, and L. Stockman. 1963. Determination of fiber strength through measurement of individual fibers. Sven. Papperstidn.66(8):301-308.nHill, R. L. 1967. The creep behavior of individual pulp fibers under tensile stress. Tappi50(8):432-440.nJayne, B. A. 1959. Mechanical properties of wood fibers. Tappi42(6):461-467.nJayne, B. A. 1960. Some mechanical properties of wood fibers in tension. For. Prod. J.10(6):316-322.nJentzen, C. A. 1964. The effect of stress applied during drying on some of the properties of individual pulp fibers. Tappi47(7):412-418.nKallmes, O. J. 1960. Distribution of the constituents across the wall of unbleached spruce sulfite fibers. Tappi43(2):143-145.nKallmes, O. J., and M. Perez. 1966. Load/elongation properties of fibres. Pages 507-528 in F. Bolam, ed. Consolidation of the paper web. Tech. Sect. Br. Pap. Board Makers' Assoc., London.nKellogg, R. M., and F. F. Wangaard. 1964. Influence of fiber strength on sheet properties of hardwood pulps. Tappi47(6):361-367.nKersavage, P. C. 1973. Moisture content effect on tensile properties of individual Douglas-fir latewood tracheids. Wood Fiber5(2):105-117.nKim, C. Y., D. H. Page, F. El-Hosseiny, and A. P. S. Lancaster. 1975. The mechanical properties of single wood pulp fibers. III. The effect of drying stress on strength. J. Appl. Polym. Sci.19(6): 1549-1561.nLeaderman, H. 1943. Elastic and creep properties of filamentous materials and other high polymers. Textile Foundation of Washington.nLeopold, B. 1966. Effect of pulp processing on individual fiber strength. Tappi49(7):315-318.nLeopold, B., and D. C. McIntosh. 1961. Tensile strength of individual fibers from alkali extracted loblolly pine holocellulose. Tappi44(3):235-240.nLeopold, B., and J. L. Thorpe. 1968. Effect of pulping on strength properties of dry and wet pulp fibers from Norway spruce. Tappi51(7):304-308.nMathevet, F. 1965. A study of some mechanical properties of fibres from Norway spruce high yield N.S.S.C. pulps. M.S. thesis, State Univ. College of Forestry, Syracuse, N.Y.nMcIntosh, D. C., and L. O. Uhrig. 1968. Effect of refining on load-elongation characteristics of loblolly pine holocellulose and unbleached kraft fibers. Tappi51(6):268-273.nMeredith, R. 1956. Cellulose fibres. Stress strain relations. Pages 71-86 in R. Meredith, ed. The mechanical properties of textile fibres. North-Holland Publishing Company, Amsterdam.nNordman, L. S., and B. Qvickström. 1970. Variability of the mechanical properties of fibers within a growth period. Pages 177-195 in D. H. Page, ed. The physics and chemistry of wood pulp fibers. Tappi Spec. Tech. Assoc. Publ. No. 8.nO'Shaughnessy, M. T. 1948. An experimental study of the creep of rayon. Text. Res. J.18(5):263-286.nPage, D. H. 1969. A method for determining the fibrillar angle in wood tracheids. J. Microsc.90(2):137-143.nPage, D. H., F. El-Hosseiny, and K. Winkler. 1971. Behavior of single wood fibres under axial tensile strain. Nature229:252-253.nPage, D. H., F. El-Hosseiny, K. Winkler., and R. Bain. 1972. The mechanical properties of single wood-pulp fibres. Part I: A new approach. Pulp Pap. Mag. Can.73(8):T198-203.nPage, D. H., F. El-Hosseiny, K. Winkler., and A. P. S. Lancaster. 1977. Elastic modulus of single wood pulp fibers. Tappi60(4):114-117.nPress, J. J. 1943. Flow and recovery properties of viscose rayon yarn. J. Appl. Phys.14(5):224-233.nRussell, J., O. J. Kallmes, and C. H. Mayhood. 1964. The influence of two wet-strength resins on fibers and fiberfiber contacts. Tappi47(1):22-25.nSakurada, I., T. Ito, and K. Nakamae. 1964. Elastic moduli of polymer crystals for the chain axial direction. Makromol. Chem.75:1-10.nSmith, M. K., and D. H. Morton. 1968. Techniques for measurement of individual fibre properties. Appita21(5):154-163.nSpiegelberg, H. L. 1966. The effect of hemicelluloses on the mechanical properties of individual pulp fibers. Tappi49(9):388-396.nStöckmann, V. E. 1971. Elementary cellulose fibrils possess an entropic deformation mechanism. J. Polym. Sci., Part C36:363-381.nTamolang, F. N., and F. F. Wangaard. 1961. Relationships between hardwood fiber characteristics and pulp-sheet properties. Tappi44(3):201-216.nTamolang, F. N., F. F. Wangaard., and R. M. Kellogg. 1967. Strength and stiffness of hardwood fibers. Tappi50(2):68-72.nVan den Akker, J. A., A. L. Lathrop, M. H. Volker, and L. R. Dearth. 1958. Importance of fiber strength to sheet strength. Tappi41(8):416-425.nVan den Akker, C. A. Jentzen, and H. L. Spiegelberg. 1966. Effects on individual fibres of drying under tension. Pages 477-506 in F. Bolam, ed. Consolidation of the paper web. Tech. Sect. Br. Pap. Board Makers' Assoc, London.n

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Published

2007-06-27

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Research Contributions