Impact of Mountain Pine Beetle-Attacked Lodgepole Pine Logs on Plywood Manufacturing
Keywords:
Gluing, grading, layup, lodgepole pine, moisture content, mountain pine beetle, plywood manufacturing, pressing, recovery, SPF, veneerAbstract
In this work, the possibility of increasing value recovery from mountain pine beetle (MPB)-attacked lodgepole pine (Pinus contorta Dougl.) logs was further investigated, including veneer grading, gluing, panel lay-up, and hot-pressing. This was a follow-up to an earlier study that demonstrated that, by segregating MPB logs, the value recovery could be improved through narrower veneer clipping width, more accurate moisture sorting, and greater drying productivity. Based on pilot plant tests, compared with control veneer of spruce—lodgepole pine—alpine fir (SPF), MPB veneer had various degrees of bluestain, and was significantly denser and stiffer. To minimize manufacturing costs for MPB plywood, glue spread can be kept at the same level as currently used by control SPF plywood. However, the pressing time of 5-ply MPB plywood should be lengthened by about 10% compared with that used by the 5-ply control SPF counterpart. The assembly time should be maintained within 10 to 15 min, keeping veneer temperature as low as possible. Furthermore, the parallel-ply MOE and MOR of 5-ply MPB plywood were approximately 15 and 20% higher than those of 5-ply control SPF plywood, respectively. As a result, MPB veneer was more suitable for making specialty plywood products requiring high stiffness and strength. If manufacturing parameters are properly adjusted in grading, gluing, and hot-pressing, segregating MPB logs from the normal SPF mix also provides an opportunity to manufacture high stiffness plywood with superior dry- and wet-gluebond performance. This could further offset, to a large degree, the reduction in material recovery and the loss in market share for some appearance-based plywood products.References
Chow S, Shepard D (1996) High performance liquid chromatographic determination of resin acids in pulp mill effluent. Tappi J 79(10):173-179.nCSA O151 (2004) Canadian softwood plywood. Canadian Standards Association.nCSA O325 (2007) Test methods for construction sheathing. Canadian Standards Association.nDeVallance DB (2003) Influence of veneer roughness, lathe check, and annual ring characteristics on glue-bond performance of Douglas-fir plywood. MS thesis, Oregon State Univ, Corvallis, OR.nGroves K (2000) Development of the GluScan image analysis system for measuring resin distribution in OSB. Forintek Canada Corp.-Report 2287. 13 pp.nMPBAP (2007) The Mountain Pine Beetle Action Plan (2006-2011). The Government of British Columbia. http://www.for.gov.bc.ca/hfp/mountain_pine_beetle/'>http://www.for.gov.bc.ca/hfp/mountain_pine_beetle/nNeese JL, Reeb JE, Funck JW (2004) Relating traditional surface roughness measures to gluebond quality in plywood. Forest Prod J 54(1):67-73.nOliveira L, Wallace J, Cai L (2005) Optimizing drying of mountain pine beetle wood. Natural Resources Canada Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Initiative Working Paper 2005-12. 30 pp.nSAS Institute Inc (1995) JMP user's guide, Version 3. Gary, North Carolina.nSellers T (1985) Plywood and adhesive technology. Marcel Dekker. NY. 661pp.nShupe TE, Hse CY, Choong ET, Groom LH (1998) Effect of wood grain and veneer side on loblolly pine veneer wettability. Forest Prod J 48(6):95-97.nWang BJ, Dai C (2004) Maximizing value recovery from mountain pine beetle-attacked pine for veneer products. Natural Resources Canada Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Initiative Report. 33 pp.nWang BJ, Dai C (2005) Maximizing value recovery from mountain pine beetle-killed pine for veneer products. Mountain Pine Beetle Initiative (MPBI) working paper 2005-9. Canadian Forest Service, Natural Resources Canada.nWang BJ, Dai C (2005) Optimization of gluing, lay-up and pressing for Mountain Pine Beetle (MPB) plywood. CFS Mountain Pine Beetle Initiative Reports. 58 pp.nWang BJ, Zhou X, Dai C, Ellis S (2006) Air permeability of aspen veneer and glueline: experimentation and implications. Holzforschung 60:304-312.nWoo KL, Watson P, Mansfield SD (2005) The effects of mountain pine beetle attack on lodgepole pine wood morphology and chemistry: implications for wood and fibre quality. Wood Fiber Sci 37(1):112-126.n
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