The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
-
Anti Rohumaa
,
Christopher G. Hunt
Abstract
During the rotary peeling of veneer for plywood or the laminated veneer lumber manufacture, checks are formed in the veneer that are as deep as 70–80% of the veneer thickness. The results of this study show that, during adhesive bond testing, deep lathe checks in birch (Betula pendula Roth.) veneer significantly reduce the shear strength and the percent wood failure of phenol-formaldehyde (PF) – bonded plywood. The results also show that specimens tested with the checks pulled open or closed can fail by different mechanisms. Dried rotary peeled birch veneers were sanded to create uniform surfaces with lathe check depths varying from 30% to 90% of veneer thickness. Then, 7-ply plywood was manufactured with a commercial PF resin. After the preparation of the test specimens, the check depth of each specimen was measured microscopically. Subsequently, bond quality was measured according to EN 314. The results show that veneer checking alone can bring EN 314 specimens to the brink of failure even with an excellent adhesive. These findings stress the importance of measuring the depth of lathe checks and considering the orientations of checks during the testing to get a better understanding of bond quality in veneer-based products.
This study was partly financed by the INTERWOOD project funded by the Finnish Funding Agency for Technology and Innovation (TEKES) and industry. J.L. gratefully acknowledges the financial support provided by the Yrjö and Senja Koivunen Foundation. David Kretschmann (FPL) is also thanked for insightful discussions about fracture mechanics. This research work was made also possible by industrial support from Dynea Chemicals Oy and Isku Teollisuus Oy.
References
ASTM Standard D906-98. Standard test method for strength properties of adhesives in plywood type construction in shear by tension loading. American Society for Testing and Materials, 2004.Search in Google Scholar
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. 43:6140–6147.10.1016/j.ijsolstr.2005.05.034Search in Google Scholar
Bethel, J.S., Huffman, J.B. (1950) Influence of lathe checks orientation on plywood shear test results. Technical Report No. 1. School of Forestry, North Carolina State College, Raleigh, NC.Search in Google Scholar
Black, J.M., Olson, W.Z. (1947) Durability of room-temperature-setting and intermediate-temperature-setting resin glues cured to different degrees in yellow birch plywood. Report No. 1537. USDA Forest Service FPL, Madison, WI.Search in Google Scholar
Chow, S. (1974) Lathe-check influence on plywood shear strength. Information report VP-X-122. Canadian Forest Service, Vancouver, BC, Canada.Search in Google Scholar
Chow, S., Warren, W.G. (1972) Efficiency of plywood bond-quality testing methods. Information Report VP-X-104. Canadian Forest Service, Vancouver, BC, Canada.Search in Google Scholar
Christiansen, A.W. (1990) How overdrying wood reduces its bonding to phenol-formaldehyde adhesives: a critical review of the literature. Part I. Physical responses. Wood Fiber Sci. 22:441–459.Search in Google Scholar
DeVallance, D.B., Funck, J.W., Reeb, J.E. (2006) Influence of several preparation conditions on Douglas-fir plywood gluebond quality test results. For. Prod. J. 56:47–50.Search in Google Scholar
DeVallance, D.B., Funck, J.W., Reeb, J.E. (2007) Douglas-fir plywood gluebond quality as influenced by veneer roughness, lathe checks, and annual ring characteristics. For. Prod. J. 57:21–28.Search in Google Scholar
Fucheng, B., Shengquan, L. (2001) Modeling the relationships between wood properties and quality of veneer and plywood of Chinese plantation poplars. Wood Fiber Sci. 33:264–274.Search in Google Scholar
Koch, P. (1965a) Effects of seven variables on properties of southern pine plywood. Part I, maximizing wood failure. For. Prod. J. 15:335–361.Search in Google Scholar
Koch, P. (1965b) Effects of seven variables on properties of southern pine plywood. Part II, maximizing wet shear strength. For. Prod. J. 15:463–465.Search in Google Scholar
Korpijaakko, S. (1999) Koivuviilun lujuuteen vaikuttavat tekijät erityisesti raskaan kuljetusvälineteollisuuden lattiavanerien valmistuksen kannalta. Master’s thesis. Helsinki University of Technology, Department of Forest Products Technology Espoo 112.Search in Google Scholar
Marra, A.A. Technology of Wood Bonding. Principles in Practice. Springer, 1992.Search in Google Scholar
National Institute of Standards and Technology, NIST (1996) Construction and industrial plywood, Voluntary product standard PS 1-95. Office of Standards Services, Gaithersburg, MD.Search in Google Scholar
Neese, J.L., Reeb, J.E., Funck, J.W. (2004) Relating traditional surface roughness measures to gluebond quality in plywood. For. Prod. J. 54:67–73.Search in Google Scholar
Palubicki, B., Marchal, R., Butaud, J.C., Denaud, L.E., Bléron, L., Collet, R., Kowaluk, G. (2010) A method of lathe checks measurement; SMOF device and its software. Eur. J. Wood Wood Prod. 68:151–159.10.1007/s00107-009-0360-ySearch in Google Scholar
Sinn, G., Sandak, J., Ramananantoandro, T. (2009) Properties of wood surfaces – characterisation and measurement. A review. Holzforschung 63:196–203.Search in Google Scholar
The European Standard (1993) EN 314-2. Plywood. Bonding quality. Part 2: Requirements.Search in Google Scholar
The European Standard (2004) EN 314-1. Plywood. Bonding quality. Part 1: Test methods.Search in Google Scholar
©2013 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Reviews
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 1: Mode I fracture
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture
- Original Articles
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- Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design
- Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp
- Mechanical performance of yew (Taxus baccata L.) from a longbow perspective
- Predicting Douglas-fir wood density by artificial neural networks (ANN) based on progeny testing information
- The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
- Fire resistance of wood treated with various ionic liquids (ILs)
- Evaluation of cell wall reinforcement in feather keratin-treated waterlogged wood as imaged by synchrotron X-ray microtomography (μXRT) and TEM
- Drying of beech (Fagus sylvatica L.) timber in oscillation climates: drying time and quality
- Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy
- Condensed conifer tannins as antifungal agents in liquid culture
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Reviews
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 1: Mode I fracture
- Influence of the moisture content on the fracture characteristics of welded wood joint. Part 2: Mode II fracture
- Original Articles
- Molecular weight distributions of acetylated lignocellulosic biomasses recovered from an ionic liquid system
- Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design
- Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp
- Mechanical performance of yew (Taxus baccata L.) from a longbow perspective
- Predicting Douglas-fir wood density by artificial neural networks (ANN) based on progeny testing information
- The influence of lathe check depth and orientation on the bond quality of phenol-formaldehyde – bonded birch plywood
- Fire resistance of wood treated with various ionic liquids (ILs)
- Evaluation of cell wall reinforcement in feather keratin-treated waterlogged wood as imaged by synchrotron X-ray microtomography (μXRT) and TEM
- Drying of beech (Fagus sylvatica L.) timber in oscillation climates: drying time and quality
- Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy
- Condensed conifer tannins as antifungal agents in liquid culture
- Meetings
- Meetings
