Plastification and wood pressing method
https://doi.org/10.21266/2079-4304.2023.242.258-267
Abstract
Aspen wood was impregnated with water, aqueous solutions of urea and urea with the addition of phosphoric acid. The thermomechanical method was used to study the deformability of wood, and to establish the main temperature transitions. Under hot pressing conditions, water acts not so much as a lytic agent, but mainly as a plasticizer. Carbamide reduces the devitrification temperature by 70 C, starting with transformations associated with the release of ammonia (132 C). The acid interacts with the carbamide and creates a slightly acidic environment, contributing to the strength of the pressed wood. Products were pressed at 160...180 C in two stages with blowing off free water and subsequent heat treatment at 150...180 C. A method of manufacturing pressed modified wood, predominantly parquet, with a density of 600–620 kg/m3 and a bending strength of 120–150 MPa without the use of molds has been patented.
About the Author
A. A. Leonovich
St.Petersburg State Forest Engineering University
Russian Federation
Russian Federation
LEONOVICH Adolf A. – DSc (Technical), Professor of the Department of
Technology of Wood and Cellulosic Composite Materials
194021. Institutskiy lane 5. St. Petersburg
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Review
For citations:
Leonovich A.A. Plastification and wood pressing method. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(242):258-267. (In Russ.) https://doi.org/10.21266/2079-4304.2023.242.258-267
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