Ultrasonic Atomization of pMDI Wood Resin
Keywords:
Ultrasonic atomization, droplet size and size distribution, pMDI resinAbstract
A novel, patent-pending approach to the application of wood resins based on an ultrasonic principle was developed in this study. Liquid polymeric methane diphenyl-diisocyanate (pMDI) resin was successfully atomized using a bench-scale 25 kHz ultrasonic atomizer. The optimal average sizes of the resin droplets generated at a flow rate of 0.7 mL/min and power input of 5.0 J/s were about 90 μm. In addition to fewer fine droplets than that produced by conventional spinning-disk atomizers, the droplets of pMDI resin produced by the ultrasonic atomizer had a more uniform droplet size distribution. These results indicate the potential advantages of implementing ultrasonic atomization in oriented strandboard production, including elimination of the hazardous fraction of fine resin droplets and potential production cost savings from improved resin efficiency. The ultrasonic atomization of wood resins appears to be a promising alternative to the spinning-disk atomizer.References
Beattie NW (1984) The lignex spinning disk blender. Pages 345 - 356 in 18th Int Particleboard/Compo Mater Series Symp. Washington State University, Pullman, WA.nBerger HL (1998) Ultrasonic liquid atomization: Theory and application, 1st Ed. Partridge Hill Publishers, Hyde Park, NY. 169 pp.nBurrows CH (1961) Some factors affecting resin efficiency in flake board. Forest Prod J 11(1):27 - 33.nCarroll M, McVey DT (1962) An analysis of resin efficiency in particleboard. Forest Prod J 12(7):305 - 310.nChristensen RL, Robertschek P (1974) Efficiency of resin-wood particle blending. Forest Prod J 24(7):22 - 25.nCoil G (1991) Adoption of high-speed spinning disk atomizers and rotary drum blenders to particleboard production. Page 344 in Proc the 25th Int Particleboard/Compo Mater Symp. Washington State University, Pullman, WA.nDobre M, Bolle L (1999) Visualization and analysis of liquid film surface patterns formed on ultrasonic atomizers. LASS-Europe'99. Toulouse, France, July 5 - 7, 1999. http://www.uclouvain.be/sites/term//recherche/ultrasonique/art0199.pdf'>http://www.uclouvain.be/sites/term//recherche/ultrasonique/art0199.pdfnEllis S (1993) Effect of resin particle-size on waferboard adhesive efficiency. Wood Fiber Sci 25(3):214 - 219.nGardner DJ, Zhang X, Watt C, Muszynski L (2005) Processes for manufacturing engineered composite objects. US patent application, provisional serial number 60/628,628. November 2005.nHeide J (2004) Application of adhesive to and processing of adhesive on receptacles for smokers' products. US patent 6740018.nHill MD, Wilson JB (1978) Particleboard strength as affected by unequal resin distribution on different particle fractions. Forest Prod J 28(11):44 - 48.nKnudson B (2005) The OSB wood resource: How it affects processing, manufacturing costs and product quality. http://www.forintek.ca/public/pdf/Trees_to_Dollars/2005/7%20.Knudson%20-%20The%20OSB%20Wood%20Resource.pdf'>http://www.forintek.ca/public/pdf/Trees_to_Dollars/2005/7%20.Knudson%20-%20The%20OSB%20Wood%20Resource.pdfnLehmann WF (1965) Improved particleboard through better resin efficiency. Forest Prod J 15(4):155 - 161.nLehmann WF (1968) Resin distribution in flakeboard shown by ultraviolet light photography. Forest Prod J 18(10):32 - 34.nMarian JE (1958) Adhesive and adhesion problems in particleboard production. Forest Prod J 8(6):172 - 176.nPanneton B, Roy PM, Theriault R (1991) Droplet generator producing narrow drop size spectra. Trans ASAE 34(6):2355 - 2362.nRajan R, Pandit AB (2001) Correlations to predict droplet size in ultrasonic atomisation. Ultrasonics 39(4):235 - 255.nSchwarz FE, Andersen RL, Kageler AG (1968) Resin distribution and how variation affects board quality. Pages 345 - 356 in Proc 2nd Symp on Particleboard. Washington State University, Pullman, WA. March 27 - 29, 1968.nSindayihebura D, Dobre M, Bolle L (1997) Experimental study of thin liquid film ultrasonic atomization. Pages 1249 - 1256 in Proc ExHFT-4, Brussels, Belgium.nSmith GD (2003) A laboratory technique for coating strands with resin droplets of controlled size and spacing. Forest Prod J 53(7 - 8):70 - 76.nSpelter H (1994) Capacity, production, and manufacture of wood-based panels in North America. http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr82.pdf'>http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr82.pdfnWilson JB, Krahmer RL (1976) Particleboard—microscopic observations of resin distribution and board fracture. Forest Prod J 26(11):42 - 45.nWinterowd JG (2005) Cost trend associated with the production and delivery of wood-based composites in North America. Wood Adhesives 2005. San Diego, CA. http://www.forestprod.org/adhesives05powerpoints.html'>http://www.forestprod.org/adhesives05powerpoints.htmlnYoungquist JA, Myers GC, Murmanis LL (1987) Resin distribution in hardboard—Evaluated by internal bond strength and fluorescence microscopy. Wood Fiber Sci 19(2):215 - 224.nZhang X, Muszynski L, Gardner DJ (2008) Spinning-disk atomization of wood resin-adhesives: I. Spray characteristics and atomization mechanisms. Forest Prod J 58(11):62 - 68.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.
