Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Reexamination Certificate
2005-06-28
2005-06-28
Lazarus, Ira S. (Department: 3749)
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
C034S426000, C034S497000
Reexamination Certificate
active
06910284
ABSTRACT:
The objective of the present invention is an accelerated drying process for wood, capable of use with all species and of maintaining the quality of the dried wood intact, in which the temperature of the system is kept within the glass transition temperature range, for an appropriate period so as to attain the intended humidity ratio of the wood. It relates to an accelerated drying process for wood based on the rheological properties (hygro-thermalviscoelastic) of the latter, where the glass transition temperature of lignin is used as a relaxant or neutralization agent for the residual growth stress of trees, as well as those from the drying process. The process is controlled by monitoring the temperatures of the wood through the use of thermocouples placed along the length of the pieces. Furthermore, the use of the process of the present invention provides a significant reduction in the drying time and a reduction of the defects because molecular fluidity is maintained.
REFERENCES:
patent: 3721013 (1973-03-01), Miller
patent: 3939573 (1976-02-01), Berti
patent: 4345384 (1982-08-01), Pagnozzi et al.
patent: 5595000 (1997-01-01), Goodwin, III
patent: 5901463 (1999-05-01), Guyonnet
patent: 5992043 (1999-11-01), Guyonnet
patent: 6248402 (2001-06-01), Guyonnet et al.
Boyd, J.D., “Tree Growth Stresses—Part V: Evidence of an Origin in Differentiation and Lignification,” Wood Science and Technology, Berlin, v. 6, p. 251-262, 1972.
Dinwoodie, J.M., “Growth Stresses in Timber—A Review of Literature”., Forestry, London, v. 39, n. 2, p. 162-170, 1966.
Galvao, A. P. M.; Jankowsky, I. P., “Secagem Racional Da Madeira”, Sao Paulo, Nobel, p. 76-79, 1985.
Malan, F.S., Studies on the Phenotypic Variation in Growth Stress Intensity and its Association with Tree and Wood Properties of South African GrownEucalyptus grandis(Hill Ex Maiden), Stellenbosch; University Stellenbosch, p. 143-145, 1984, PhD Thesis.
Mendes, A.S.; Martins, V.A.; Marques, M.H.B., “Programas De Secagem Para Madeiras Brasileiras”, Brasilia, IBMA, 1998, 114p.
Milota, M.R., “Drying Wood: The Past, Present, And Future”, International IUFRO Wood Drying Conference 6, 1999, Stellenbosch. Proceedings. (University of Stellenbosch, 1999, p. 1-10).
Perre, P., Ecole Nationale Du Genie Rural, Des Eaux Et Des Forets, ENGREF Nancy, Unite Produits Forestiers, 1984 (mentioning Krischer and Knoll, 1956).
Peyser, P., “Glass Transition Temperatures of Polymers”, Polymer Handbook, 3rdEd., v. 1, 1989.
Ponce, R.H.; Watai, L.T., “Manual de Secagem da Madeira”, Sao Paulo, IPT, 1985, 72p.
Simpson, W.T., “Drying Wood: A Review—Part I”, Drying Technology, v. 2, n. 2, p. 235-264, (1983-84).
Simpson, W.T., “Drying Wood: A Review—Part II”, Drying Technology, v. 2, n. 3, p. 353-368, (1983-84).
Perré Patrick
Romeiro de Aguiar Osmar José
Ecole Nationale du Genie Rural des Eaux et des Forets-Engref
Empresa Brasileira de Pesquisa Agropecuaria-Embrapa
Lazarus Ira S.
O'Malley Kathryn S.
Sughrue & Mion, PLLC
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