Phenol Adhesive Bonded Medium-Density Fiberboard From Quercus Rubra L. Bark and Sawdust
Keywords:
Quercus rubra, adhesives, phenol-formaldehyde, fiberboard, hardwood, sawdust, bark, pressure-refined, resin content, sodium pentachlorophenate, particleboard, bending test, tensile strength, modulus of rupture, modulus of elasticity, internal bond, screw-holding, thickness swelling, linear expansionAbstract
Twelve-millimeter-thick medium density fiberboards made from double-disc, steam-pressure-refined red oak sawdust fibers at 6.5 and 9.0% phenol-formaldehyde levels for both, with and without the addition of sodium pentachlorophenate, meet most of the specifications required for exterior-grade, medium density, class 1 commercial particleboard and medium density hardboard. Panels made from red oak bark fibers showed inferior properties to panels made from red oak sawdust fibers. However, at a 9% resin level, untreated bark fiberboard exhibited acceptable modulus of elasticity in bending, internal bond, and face screw-holding values. The addition of the preservative to the adhesive had the effect of decreasing all of the strength properties and the linear expansion values of all untreated panels at three resin levels.
Three-layer type of panels made from red oak sawdust fiber faces and red oak bark fiber core had higher bending strength, stiffness, and face screw-holding values, but lower internal bond and tensile strength parallel to face values than a homogeneous type of panel made from a mixture of equal weight of sawdust and bark fibers. Three-layer panels also showed lower linear expansion values than the homogeneous type of panel. At a 6.5% resin level, both homogeneous and three-layer types of panels had acceptable strength properties except for the tensile strength parallel to face and linear expansion values.
References
American Society for Testing and Materials. 1978. Standard methods of evaluating the properties of wood-base fiber and particle materials, ASTM Designation D1037-72a, Philadelphia, PA.nBrown, G. E., and H. M. Alden. 1960. Protection from termites: Penta for particle board. For. Prod. J. 10(9):434-438.nChow, P. 1976. Properties of medium-density, dry-formed fiberboard from seven hardwood residues and bark. For. Prod. J. 26(5):48-55.nHuber, H. A. 1958. Preservation of particleboard and hardboard with Pentachlorophenol. For. Prod. J. 8(12):357-360.nMottet, A. D. 1975. Use of mill residues and mixed species in particleboard manufacture, FO/ WCWBP/75, DOC, no. 59. FAO, United Nations, Rome, Italy, 6 pp.nU. S. Department of Commerce. 1966. National Bureau of Standards; Commercial Standard CS236-66, Mat-formed wood particleboard. Washington, DC, 10 pp.nU. S. Department of Commerce. 1973. National Bureau of Standards, Voluntary Product Standard, PS 58-73, Basic Hardboard. Washington, DC, 4 pp.n
Downloads
Published
Issue
Section
License
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.
