Hexamethyldisilazane Treatment To Restore Strength of Recycled Fiber
Keywords:Hexamethyldisilazane treatment, recycled fibers, fibrils, microfibrils, scanning electron microscopy, strength properties, bonding
AbstractWhen pulp fibers dry, many fibrils and microfibrils dry down onto the surface of the fiber and are unavailable for fiber bonding. Therefore, the paper or paper products produced are not as strong as similar products made from pulp that has never been dried. Recent studies have suggested that hexamethyldisilazane (HMDS) treatment of pulp fibers will raise dried-down fibrils and microfibrils. The objective of this work was to determine if HMDS treatment can be used to increase sheet strength of fiber from recycled corrugated fiberboard components by raising fibrils and microfibrils from fiber surfaces. Overall, HMDS treatment improved burst, tear, and tensile indices of handsheets from recycled fibers from linerboard and corrugated medium. Scanning electron micrographs show the presence of many more raised fibrils and microfibrils on HMDS-treated fiber. These raised fibrils and microfibrills appear to be the cause for increased sheet strength.
Clark, J. d'A. 1978. Pulp technology and treatment for paper. Chapter 6. Miller Freeman, San Francisco.nCohen, A. L. 1974. Critical point drying. Principles and techniques of scanning electron microscopy. Vol. 1. Pages 44-112 in M. A. Hayat, ed. Van Nostrand Reinhold, New York.nHorn, R. A. 1975. What are the effects of recycling on fiber and paper properties. Pap. Trade J. 17(24):78-82.nKlunoness, J. H. 1974. Recycled fiber properties as affected by contaminants and removal processes. USDA Forest Serv. Res. Pap. FPL 223. Forest Prod. Lab., Madison, WI. 16 pp.nKoning, Jr., J. W., and W. D. Godshall. 1975. Repeated recycling of corrugated containers and its effect on strength properties. Tappi 58(9): 146-150.nLewis, E. R., and M. K. Nemonic. 1973. Critical point drying techniques. Scanning Electron Microscopy, Chicago Institute of Technology Research Institute. Pp. 767-774.nMaltenfort, G. G. 1970. Corrugated containers. Pages 557-575 in K. W. Britt, ed. Pulp and Paper Technol. Van Nostrand Reinhold, New York.nMcKee, R. C. 1971. Effect of repulping on sheet properties and fiber characteristics. Pap. Trade J. 155(21):34.nNation, J. L. 1983. A new method using hexamethyldisilazane for preparation of soft insect tissues for scanning electron microscopy. Stain Technol. 58(6):347-351.nRydholm, S. A. 1965. Pulping processes. Interscience, New York. P. 608.nSachs, I. B. 1986. Retaining raised fibrils and microfibrils on fiber surfaces. Tappi 69(11):124-127.nSachs, I. B. 1987. Retaining raised fibrils and microfibrils on oak fiber surface. Wood Fiber Sci. 19(2): 196-203.n
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