Increasing Sawn Timber Yield in Cant Sawing. C. 152-167

Complete text of the article:

Download article (pdf, 1.1MB )

UDС

674.093

DOI:

10.37482/0536-1036-2024-1-152-167

Abstract

The log cutting theory accepts that the volumetric yield of edged sawn timber from the maximum volume cant will be maximal. According to current standards, edged sawn timber must have specified thickness and width. Some cants are not used for the production of centre yield because the widths of their faces are aliquant of the centre yield thickness. The volume of such cant in centre yield production is not taken into account in the log cutting theory and the conclusion that their volumetric yield from the maximum volume cant will be maximal is not obvious. The 1st stage of cant sawing is obtaining a two-edged cant from a log. At that, due to the deviation of the roundwood axis from the centre line of the sawing pattern, a narrow and a wide face are obtained. We consider the dimensioning of the narrow face of a two-edged cant, as its size determines the volumetric yield of centre yield. Within the narrow face of a two-edged cant 2 zones are allocated: unconditional and probabilistic. In the unconditional zone, an integer number of edged boards is obtained. In the range of roundwood diameters from 17 to 29 cm, only the roundwood with the diameters of 21 and 25 cm have provided the maximum volume two-edged cants, but the volumetric yield of the centre yield from the roundwood of these diameters has not been maximal. It follows from this that the maximum volume cant does not guarantee the maximal volumetric centre yield. The probability zone includes a non-integer number of edged boards. It is impossible to determine their number in an analytical way, so the methods of probability theory have been used. The distribution function of the narrow face of a two-edged cant has been derived. In order to use the distribution function to obtain a non-integer number of edged boards, the width of the probability zone has been calculated, as well as the size of the part of the probability zone decisive in obtaining a non-integer number of edged boards and the confidence interval. Further, the “Distribution function of the width of the narrow face of a two-edged cant” table was used to determine the non-integer number of edged boards. Obtaining the noninteger number of the edged boards from a two-edged cant can be implemented in practice using changeable or adjacent sawing patterns. The presented results can be applied when determining the number of sorting groups of roundwood before its feeding to the sawmill and when changing the technology of centre yield production.

Authors

Aleksandr A. Kaptelkin*, Assistant; ResearcherID: AAC-8654-2019,
ORCID: https://orcid.org/0000-0002-8470-3496
Nadezhda V. Kulikova, Candidate of Engineering, Assoc. Prof.;
ResearcherID: AGU-5552-2022, 
ORCID: https://orcid.org/0000-0002-6631-5246
Stanislav N. Rykunin, Doctor of Engineering, Prof.; ResearcherID: N-3182-2013,
ORCID: https://orcid.org/0000-0002-4471-4668

Affiliation

Bauman Moscow State Technical University (Mytishchi Branch), ul. 1-ya Institutskaya, 1, Mytishchi, Moscow Region, 141005, Russian Federation; kaptelkin94@mail.ru*, stelons@mail.ru, rikunin@mgul.ac.ru

Keywords

roundwood, sawing pattern, cant, edged sawn timber, unconditional zone, probabilistic zone

For citation

Kaptelkin A.A., Kulikova N.V., Rykunin S.N. Increasing Sawn Timber Yield in Cant Sawing. Lesnoy Zhurnal = Russian Forestry Journal, 2024, no. 1, pp. 152–167. (In Russ.). https://doi.org/10.37482/0536-1036-2024-1-152-167

References

1. Ageev S.P., Melekhov V.I., Rykunin S.N. Probabilistic Modeling of the Sawn Timber Production Process. Lesnoy Vestnik = Foresty Bulletin, 2015, vol. 19, no. 2, pp. 89–95 p. (In Russ.).
2. Aksenov P.P. Theoretical Basis for Сutting Sawlogs. Moscow, Leningrad, Goslesbumizdat Publ., 1960. 216 p. (In Russ.).
3. Zalgaller V.A. Innovations in Compilation of Sawing Patterns. Proceedings of the Central Research Institute of Forestry. Leningrad, Sevzaples Publ., 1956, iss. 67, pp. 32–67. (In Russ.).
4. Kaliteevskiy R.E. Sawmill in the 21st Century. Technology, Equipment, Management. St. Petersburg, PROFI-INFORM Publ., 2005. 480 p. (In Russ.).
5. Kantorovich L.V. Selection of Sawing Patterns Ensuring Maximum Sawn Timber Yield at a Given Range. Lesnaya promyshlennost’ Publ., 1949, no. 7, pp. 15–17; no. 8, pp. 17–19. (In Russ.).
6. Kaptelkin A.A., Kulikova N.V., Novoselov N.A., Rykunin S.N. Processing Small Birch Roundwood in the Conditions of Limited Demand for Technological Сhips. Predictive Nature of Scientific Research and the Practice of Its Implementation in the Conditions of Global Crisis in the Economy and Society: Collection of Scientific Articles Based on the Results of the International Scientific and Practical Conference. St. Petersburg State University of Economics Publ., 2020, pp. 7–11. (In Russ.).
7. Kulikova N.V., Kaptelkin A.A., Rykunin S.N. About the Technology of Production of Sawn Timber from Small Round Timber. Current Issues and Prospects for the Development of the Forest Industry Complex: Materials of the 4th International Scientific and Practical Conference. Kostroma, 2021, pp. 142–144 p. (In Russ.).
8. Ogurtsov V.V. Cant Sawing Theory of Logs: Monograph. Krasnoyarsk, SibSTU Publ., 2011. 230 p. (In Russ.).
9. Pesotskiy A.N., Yasinskiy V.S. Rational Use of Wood in Sawmilling. Moscow, Lesnaya promyshlennost’ Publ., 1977. 128 p. (In Russ.).
10. Rykunin S.N., Kulikova N.V., Kaptelkin A.A. The Influence of Сapital Movement on the Demand for Direct Labor in the Material Production Sphere. Post-non-Classical Science: Interdisciplinarity, Problem Orientation, and Applied Nature: Collection of Scientific Articles Based on the Results of the International Scientific and Practical Conference. St. Petersburg, June 29–30, 2021. St. Petersburg, St. Petersburg State University of Economics Publ., 2021, pp. 12–14. (In Russ.).
11. Rykunin S.N., Kulikova N.V., Kaptelkin A.A. Changes in the Demand for Direct Labor in the Implementation of Development Strategies for Industries in the Russian Federation. Current scientific Hypotheses and Predictions: from Theory to Practice: Collection of Scientific Articles Based on the Results of the International Scientific and Practical Conference. St. Petersburg, August 30–31, 2021. St. Petersburg, St. Petersburg State University of Economics Publ., 2021, pp. 7–9. (In Russ.).
12. Rykunin S.N., Kulikova N.V., Kaptelkin A.A. Innovations in Investments in the Conditions of International Labor Division in the Enterprises Producing Construction Materials from Wood. Innovation and Investment Foundation for the Development of the Economy of the Society and State: from Scientific Development to Practice: Collection of Scientific Articles Based on the Results of the International Scientific and Practical Conference. St. Petersburg, December 27–28, 2021. St. Petersburg, St. Petersburg State University of Economics Publ., 2021, pp.11–13. (In Russ.).
13. Titkov G.G. Summary Guide on Compiling and Calculation of Sawing Patterns. Moscow, Leningrad, Goslesbumizdat Publ., 1955. 50 p. (In Russ.).
14. Toropov A.S., Sharapov E.S. Study of Birch Wood Density Affected by Firm Red Heart. Lesnoy Zhurnal = Russian Forestry Journal, 2006, no. 6, pp. 72–79. (In Russ.).
15. Toropov A.S., Sharapov E.S. Study of the Technology of Obtaining Homogeneous Blanks from Birch Wood Affected by Firm Red Heart. Current Problems of the Timber Complex: Collection of Scientific Works Based on the Results of the International Scientific and Technical Conference. Bryansk, Bryansk State Engineering and Technological Academy, 2006, iss. 14, pp. 164–167. (In Russ.).
16. Toropov A.S., Sharapov E.S. New Technologies for Cutting of Wood Affected by Firm Red Heart. Lesnoy Vestnik = Foresty Bulletin, 2008, no. 6(63), pp. 59–62. (In Russ.).
17. Turushev V.G. Sawn Timber Edging. Moscow, Lesnaya Promyshlennost’ Publ., 1970. 56 p. (In Russ.).
18. Fel’dman Kh.L. System of Maximum Sawing Pattern for Cutting. Moscow, Goslestekhizdat Publ., 1932. 276 p. (In Russ.).
19. Fergin V.R. Development Development of the Sawing Process Theory. Lesnoy Zhurnal = Russian Forestry Journal, 2018, no. 4, pp.107–117. (In Russ.).
20. Chubinskiy A.N., Tambi A.A., Shvets V.L. Analysis of Sawlogs Shape Influence on Sawmill Equipment Choice. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii = News of the Saint Petersburg State Forest Technical Academy, 2014, iss. 208, pp. 63–72. (In Russ.).
21. Shtorm R. Probability Theory. Mathematical Statistics. Statistical Quality Control. Moscow, Mir Publ., 1970. 368 p. (In Russ.).
22. Brege S., Nord T., Sjostrom R., Stehn L. Value-Added Strategies and Forward Integration in the Swedish Sawmill Industry: Positioning and Profitability in the High-Volume Segment. Scandinavian Journal of Forest Research, 2010, no. 25(5), pp. 482–493.
23. Cramer H. Mathematical Methods of Statistics. Princeton, 1946. 575 p.
24. Johansson J. Förutsättningar för Konkurrenskraftigt Utnyttjande av Svenskt Lövtimmer i Svenska Lövsågverk [Requirements for Competitive Use of Swedish Hardwood in Swedish Hardwood Sawmills]. Växjö University, School of Industrial Engineering, 2003, report no. 5. 48 p.
25. Johansson J. Mechanical Processing for Improved Products Made from Swedish Hardwood. Växjö University, School of Technology and Design, 2008, no. 157. 140 p.
26. Johansson J. Product Differentiation in the Swedish Hardwood Sawmill Industry. Växjö University, School of Technology and Design, 2005, report no. 25. 41 p.
27. Makkonen M. Renewing the Sawmill Industry: Studies on Innovation, Customer Value and Digitalization. Dissertationes Forestales, 2019. 65 p. https://doi.org/10.14214/df.269
28. Makkonen M. Stakeholder Perspectives on the Business Potential of Digitalization in the Wood Products Industry. BioProducts Business, 2018, vol. 3, no. 6, pp. 63–80. https://doi.org/10.22382/bpb-2018-006
29. Makkonen M., Sundqvist-Andberg H. Customer Value Creation in B2B Relationships: Sawn Timber Value Chain Perspective. Journal of Forest Economics, 2017, vol. 29, part B, pp. 94–106. https://doi.org/10.1016/j.jfe.2017.08.007
30. The Ministry of Industry, Employment and Communications. Mer Trä i Byggandet: Underlag för en Nationell Strategi att Främja Användning av Trä i Byggandet. Stockholm, 2004, DS 2004:1.