Retaining Raised Fibrils and Microfibrils on Oak Fiber Surfaces
Keywords:Hexamethyldisilazane treatment, air-drying, paper-machine-drying, bonding, fibers, fibrils, microfibrils, hardwood pulp, scanning electron microscopy, strength properties
AbstractDrying of spruce softwood kraft fibers treated with hexamethyldisilazane (HMDS) has been found to: (1) maintain fibrils and microfibrils in a raised position on fiber surfaces, (2) raise fibrils and microfibrils that had been dried down on fiber surfaces, and (3) increase strength properties of handsheets made from dried fiber. The question whether shorter thick-walled hardwood fibers behave similarly is examined in the present study of the effect of HMDS-drying on oak kraft pulp fibers. The effects of HMDS-drying, air-drying, and paper-machine-drying were evaluated by observing the surfaces of refined hardwood kraft pulp fibers. Using scanning electron microscopy, the fiber surfaces of these dried fibers were compared with those of never-dried fiber whose morphology was preserved by critical point drying. In addition, air-dried and paper-machine-dried fibers were examined after rewetting and HMDS-treatment to recover fibrils and microfibrils. Overall strength properties were considerably greater when handsheets were made from pulps treated with HMDS than from pulps that were dried in air or on the paper machine.
Albrecht, R. M., and A. P. MacKenzie. 1975. Cultured and free-living cells. Pages 109-153 in M. A. Hayat, ed. Principles and techniques of scanning electron microscopy, vol. III. Van Nostrand Reinhold Co., New York.nBritt, K. W. 1970. Paper testing. Page 665 in K. W. Britt, ed. Handbook of pulp and paper technology. Van Nostrand Reinhold Co., New York.nGunderson, D. E. 1983. Edgewise compression of paperboard: A new concept of lateral support. Appita 37(2):137-141.nMcIntosh, D. C. 1970. Fiber structure and properties. Page 37 in K. W. Britt, ed. Handbook of pulp and paper technology. Van Nostrand Reinhold Co., New York.nRobinson, J. V. 1980. Fiber bonding. Pages 915-963 in J. P. Casey, ed. Pulp and paper, chemistry and chemical technology. John Wiley and Sons, New York.nRydholm, S. A. 1965. Pulping processes. John Wiley and Sons, New York.nSachs, I. B. 1985. Preserving and recovering pulp fibrils subsequent to drying. Paper Tech. Ind. 26(1):38-41.nSachs, I. B. 1986. Retaining raised fibrils and microfibrils on fiber surfaces. Tappi J. 69(11):124-127.nThomas, B. B. 1970. Pulp properties. Page 225 in K. W. Britt, ed. Handbook of pulp and paper technology. Van Nostrand Reinhold Co., New York.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.