Abstract
Driven by the need for productivity and recovery, rotary veneer peeling for softwood plywood manufacturing has changed from the use of a small 5/8-inch (15.88 mm) diameter roller bar to a big roller bar with diameter ranging from 2.50 to 3.75 inches (63.50 to 95.25 mm). This study focused on the effects of conditioning temperature on veneer quality using a big roller bar. A 4-ft (1.22 m) pilot plant rotary lathe consisting of a 3-inch (76.20 mm) diameter roller bar was used to peel a total of 130 logs. The peeling study was conducted on three commonly used conifers, namely, western white spruce, lodgepole pine and Douglas fir. The laboratory results indicated that increasing log temperature led to increase in veneer surface roughness and thickness variation, but decrease in lathe checks. The optimum log temperatures under the slow-speed laboratory peeling condition were 85–100°F (29–38 °C). Considering knife wear, lathe vibration and fast peeling speed, the optimum peeling temperatures for typical softwood plywood mills were found to be 85–95°F (29–35 °C) for spruce, 95–100°F (35–38 °C) for lodgepole pine, and 110–120°F (43–49 °C) for Douglas fir. These temperatures were significantly lower than 130°F (54 °C) previously suggested based on a small roller bar. The results of this study have been widely implemented by the Canadian softwood plywood industry with confirmed benefits of energy-saving and veneer quality improvement.
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References
Aydin I, Colakoglu G, Hiziroglu S (2006) Surface characteristics of spruce veneers and shear strength of plywood as a function of log temperature in peeling process. Int J Solids Struct 43(20):6140–6147
Back EL, Salmen NL (1982) Glass transition of wood components hold implications for molding and pulping processes. Tappi 65:107–110
Dai C, Murase Y (1997) An overview of recent developments in veneer peeling technology. In: Proceedings of the 13th International Wood Machining Seminar. Vancouver, Canada, June 17–20, pp 537–546
Dai C, Troughton GE (2011) Effect of log conditioning temperature on veneer quality. Technical report, FP Innovations
Dai C, Wang BJ, Chen S (2002a) User help manual of veneer peeling software: VPeel 2.0. Forintek Canada Corp. Report. pp 29
Dai C, Wang BJ, Chen S (2002b) Log conditioning simulation software: Logcon 4.0. Forintek Canada Corp. Report, pp 38
Dai C, Troughton GE, Wang BJ (2003) Development of a new incising technology for plywood/LVL production: Part 1. Incising at the lathe and its effect on veneer quality and recovery. For. Prod J 53(3):73–79
Dupleix A, Denaud LE, Bleron L, Marchal R, Hughes M (2013) The effect of log heating temperature on the peeling process and veneer quality: beech, birch, and spruce case studies. Eur J Wood Prod 71(2):163–171
Hailey JRT, Hancock WV (1973) Methods and techniques for veneer-peeling research. Forintek Canada Corp. VP-X-107. 23 pp
Kinoshita N (1982) Rotary veneer peeling of softwood. Mokuzai Kogyo (Wood Ind) 37(10):486–489
Meriluoto J (1965) The influence of raw material factors on the quantity and quality of rotary cut brick veneer. Acta For Fenn 80:1–155
Northcott PL, Walser DC (1965) Veneer Roughness Scale. B.C. Lumberman, July: 80–82
Resch H, Parker R (1979) Heat conditioning of veneer blocks. Research Bulletin 29. Forest Research Lab. Oregon State University, Corvallis, Oregon. USA, pp 33
Rohumaa A, Hunt CG, Frihart CR, Saranpää P, Ohlmeyer M, Hughes M (2014) The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer. Holzforschung 68(8):965–970
Rohumaa A, Antikainen T, Hunt CG, Frihart CR, Hughes M (2016a) The influence of log soaking temperature on surface quality and integrity performance of birch (Betula pendula Roth) veneer. Wood Sci Technol 50(3):463–474
Rohumaa A, Yamamoto A, Hunt CG, Frihart CR, Hughes M, Kers J (2016b) Effect of log soaking and the temperature of peeling on the properties of rotary-cut birch (Betula pendula Roth) veneer bonded with phenol-formaldehyde adhesive. BioResources 11(3):5829–5838
Rohumaa A, Hunt CG, Frihart CR, Kers J, Denaud L, Hughes M (2017) The impact of log heating on veneer quality and plywood performance. In: 6 th International Scientific Conference on Hardwood Processing, pp 213
Rohumaa A, Viguier J, Girardon S, Krebs M, Denaud L (2018) Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer. Eur J Wood Prod 76(6):1653–1661
Stefanowski S, Frayssinhes R, Pinkowski G, Denaud L (2020) Study on the in-process measurements of the surface roughness of Douglas fir green veneers with the use of laser profilometer. Eur J Wood Product 78(3):555–564
Wang BJ, Dai C, Troughton GE (2004) Development of a new incising technology for plywood/LVL production: Part 2. Effect of incising on LVL strength properties. For. Prod J 53(11/12):99–102
Wang BJ, Dai C, Groves K (2014) Optimal log diameter sorting for veneer processing. Conference: Bio-Composites
Zhou C, Smith GD, Dai C (2009) Characterizing hydro-thermal compression behavior of aspen wood strands. Holzforschung 63(5):609–617
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Support from FPInnovations and its members for this work is gratefully acknowledged. Financial support from Natural Sciences and Engineering Research Council of Canada (NSERC) through a Discovery Grant is also gratefully acknowledged.
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Chen, M., Troughton, G. & Dai, C. Optimum veneer peeling temperatures for selected softwood species using big roller bars. Eur. J. Wood Prod. 79, 151–159 (2021). https://doi.org/10.1007/s00107-020-01619-5
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DOI: https://doi.org/10.1007/s00107-020-01619-5