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119 results found
In developing new adhesives for wood bonding, the testing of bond performance can often be a limiting factor in the development process. Evaluating the bond performance of an adhesive that can be prepared in less than a day often takes several days using standard performance tests. This testing…
Author(s): James M. Wescott, Michael J. Birkeland, Amy E. Traska, Charles R. Frihart, Brice N. Dally
Keywords: wood moisture, deterioration, adhesion, adhesives, testing, moisture content, rapid testing, ABES, Automated Bond Evaluation System, failure, failures in wood, strength, wood bonding, bonding, bond strength, durabilty
Source: Proceedings : 30th annual meeting of the Adhesion Society, Inc. : February 18-21, 2007, Tampa Bay, FL. [S.l. : s.n.], c2007: pages 219-221.
Year: 2007
When dry wood is placed in water, the water not only fills the lumen (void in the cells) but also diffuses into the cell walls, causing them to expand. Although the wood becomes weaker via this cell wall plasticization, failure generally increases in the bondline rather than in the wood under wet…
Author(s): Charles R. Frihart
Keywords: Wood moisture, adhesion, adhesives, moisture content, testing, bondline, shrinkage, failure, failures in wood, swelling, strength, bond strength, durability, wood bonding, bonding
Source: Proceedings : 30th annual meeting of the Adhesion Society, Inc. : February 18-21, 2007, Tampa Bay, FL. [S.l. : s.n.], c2007: pages 222-224.
Year: 2007
High moisture content, flat sawn Japanese cedar (Cryptomeria japonica D. Don) veneer was compressed using a roller press to mechanically remove water. The amount of water removed depended on the amount of compression applied. At 60% compression, 400 kg/m3 of water was removed. The process was not…
Author(s): Koji Adachi, Masafumi Inoue, Kozo Kanayama, Roger M. Rowell, Shuichi Kawai
Keywords: Veneers, veneering, moisture, drying, Cryptomeria japonica, cedar, bending strength, compression, roller pressing, strength
Source: Journal of wood science. Vol. 50 (2004): p. 479-483.
Year: 2004
Evaluations of several mechanical and physical properties were conducted on specimens from five yagrumo hembra (Cecropia peltata) trees from Puerto Rico. With the exception of toughness and modulus of elasticity in both bending and compression parallel to grain, these specimens were lower in…
Author(s): B. A. Bendtsen
Keywords: Mechanical properties, physical properties, toughness, modulus of elasticity, bending, compression, specific gravity, strength, shrinkage, Puerto Rico, tangential shrinkage, Cecropia peltata, yagrumo hembra, radial shrinkage
Source: Research note FPL no. 053. Madison, WI : USDA Forest Service, Forest Products Laboratory. 7, [7] pages.
Year: 1964
Various chemical treatments have been investigated at the Forest Products Laboratory for improving the compressive strength of linerboard exposed at high humidities and after water-soaking. Phenolic resins have been among the more promising chemicals studied, but they vary in performance. The low-…
Author(s): D. J. Fahey
Keywords: Chemical treatment, humidity, resorcinol, starch, protein, compressive strength, moisture, packaging, stacking, strength, water soaking, phenolic resins, melamine urea formaldehyde, hydrocarbon resins, fiberboard containers
Source: Fesearch note FPL no. 084. Madison, WI : USDA, Forest Service, Forest Products Laboratory. 12 pages.
Year: 1964
To establish the effect of using modulus elasticity in addition to visual grade as criteria for the positioning of laminations in laminated beams, an experimental study on southern pine members was conducted. The beams were manufactured in accordance with current specifications for glued-laminated…
Author(s): R. C. Moody, Billy Bohannan
Keywords: Modulus of elasticity, beams, bending, stiffness, strength, laminated wood, glulam, visual grades, tension lamination, modulus of rupture, deflection limitations
Source: Research paper FPL no. 127. Madison, WI : USDA, Forest Service, Forest Products Laboratory. 20 pages.
Year: 1970
Determining optimum distribution of fiber through rational design of corrugated fiberboard could result in significant reductions in fiber required to meet end-use conditions, with subsequent reductions in price pressure and extension of the softwood timber supply. A theory of thin plates under…
Author(s): Millard W. Johnson, Thomas J. Urbanik, William E. Denniston
Keywords: Compression, design, elasticity, fiberboards, model, strength, compressive strength, buckling, plates, fiberboard, standards
Source: Research paper FPL no. 348. Madison, WI : USDA, Forest Service, Forest Products Laboratory. 39 pages.
Year: 1979
“Both the strength and stability of compressively loaded paperboard are known to be adversely affected by cyclic changes in relative humidity. Current research at the Forest Products Laboratory (FPL) seeks to observe and explain this phenomenon and to develop a simple, practical test to determine…
Author(s): Dennis E. Gunderson, John M. Considine
Keywords: Mechanical properties, creep, moisture, paperboard, strength, humidity, strain, transient effects
Source: Proceedings of the 1986 International Process and Materials Quality Evaluation Conference. Atlanta : Tappi Press, 1986: pages 245-251.
Year: 1986
Recently, we showed that a biomechanical pulping process in which aspen chips are pretreated with a white-rot fungus can give energy savings and can increase paper sheet strength. To optimize this process, we need more efficient ways to evaluate the fungal treatments. Here, we examine a method that…
Author(s): Gary F. Leatham, Gary C. Myers
Keywords: Pulping, pulps, strength, wood pulp, mechanical pulping, biotechnology, screening, physical properties, biopulping, white rot, fungal treatments, biomechanical pulping
Source: Tappi journal. (Apr. 1990): pages 192-197.
Year: 1990
Eleven types of aspen ultra-high-yield (90% and above) mechanical pubs were evaluated for their chemical compositions (including sulfur), handsheet strength, and optical properties, fiber length indices, and fiberizing energies. The pulping processes were stone groundwood, pressurized stone…
Author(s): J. N. McGovern, T. H. Wegner
Keywords: Chemical analysis, mechanical pulping, optical properties, pulping, refining, strength, sulfonation, Populus, paper, wood pulp, sheet strength
Source: Tappi journal. Vol. 74, no. 8 (Aug. 1991): Pages 157-161.
Year: 1991