Sawing of round logs with heart butt rot
https://doi.org/10.53374/1993-0135-2023-1-80-88
Abstract
Softwood lumber is widely used for various wood products manufacturing. Recently, the quality of coniferous round logs has been reducing due to the presence of heart butt rot, which has to be removed during the logs processing. Removal of butt rot occurs already at the harvesting stage of round logs. At the same time not decayed sapwood parts is removed with the degraded wood. Therefore a large amount of sound wood can remain in the forest.
To obtain the maximum yield of sawn timber an optimization model of individual log with heart rot cutting was presented. Optimization model is based on allometric correlations between the diameter (radius) and length of the decayed wood zone and round log. For cross cutting of round logs with heart rot a special technological process can be applied to obtain a combined logs. The combined logs consists of both a sound wood part and a part with decayed wood. The length of the combined log depends on the method of its further processing into sawn timber. The article shows the sequence of finding the length of the combined logs and the volumetric yield of sawn timber.
A simulation model has been presented for evaluation the yield of sawn timber from decayed round logs. The factors that significantly influenced on the yield were the length and diameter of round logs. Experimental tests of round logs sawing with heart butt rot was carried out to determine the actual yield of sawn timber. A slight difference between the theoretical and experimental data on the volumetric yield of sawn timber has been established. This makes it possible to propose the presented method for decayed logs cutting for subsequent industrial application.
About the Authors
V. E. Byzov
Saint-Peterburg State Forest Technical University under name of S. M. Kirov
Russian Federation
Russian Federation
Institutskii al. 5, Saint-Petersburg, 194021
A. S. Toropov
Volga State University of Technology
Russian Federation
Russian Federation
Lenin sq. 3, Yoshkar-Ola, Mari El Republic, 424000
E. V. Toropova
Volga State University of Technology
Russian Federation
Russian Federation
Lenin sq. 3, Yoshkar-Ola, Mari El Republic, 424000
E. V. Mikryukova
Volga State University of Technology
Russian Federation
Russian Federation
Lenin sq. 3, Yoshkar-Ola, Mari El Republic, 424000
E. S. Sharapov
Volga State University of Technology
Russian Federation
Russian Federation
Lenin sq. 3, Yoshkar-Ola, Mari El Republic, 424000
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Review
For citations:
Byzov V.E., Toropov A.S., Toropova E.V., Mikryukova E.V., Sharapov E.S. Sawing of round logs with heart butt rot. Conifers of the boreal area. 2023;41(1):80-88. (In Russ.) https://doi.org/10.53374/1993-0135-2023-1-80-88
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