Influence of poplar wood densification on surface characteristics and adhesion strength

Document Type : Research Paper

Authors

1 Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.

2 2- Assistant Prof., Wood and Forest Products Division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran

Abstract

The main purpose of this study was to evaluate the effect of densification process on the surface characteristics and bonding quality of poplar wood. For this purpose, the specimens were treated by hygrothermal treatment and then were densified by hot press. Some properties of treated specimens such as surface contact angle and surface roughness were evaluated before and after planning. Moreover, the shear strength of glue line and also delamination of specimens in soaking-drying and boiling-drying cycles were investigated. The results of the poplar wood densification revealed that the surface roughness of the specimens reduced and surface contact angle increased by hygrothermal pre-treatment. The results also showed the positive effect of combined hygrothermal and compression treatment on the delamination after soaking-drying and boiling-drying cycles. In addition, the shear strength of glue line reduced by applied combined treatments. In addition, microscopic images showed that this process changed the physical structure of the surface.

Keywords

References

[1] Gong, M., Lamason, C. and Li, L., 2010. Interactive Effect of Surface Densification and Post-Heat- Treatment on Aspen Wood. Journal of Materials Processing Technology, 210: 293–296.
[2] Mohebby, B., Sharifinia-Dizboni, H. and Kazemi-Najafi, S., 2009. Combined Hydro-Thermo-Mechanical Modification (CHTM) as an Innovation in Mechanical Wood Modification. In: Proceeding of 4th European Conference on Wood Modification (ECWM4), Stockholm, Sweden, 98: 353-360.
[3] Kutnar, A., Kamke, F.A., Petri, M. and Sernek, M., 2008. The Influence of Viscoelastic Thermal Compression on the Chemistry and Surface Energetics of Wood. Colloids and Surfaces A: Physicochem. Eng. Aspects, 329: 82–86.
[4] Welzbacher, C.R., Wehsener, J., Rapp, A.O. and Haller, P., 2008. Thermo-Mechanical Densification Combined with Thermal Modification of Norway Spruce (Picea abies Karst) in Industrial Scale-Dimensional Stability and Durability Aspects. Holz Roh Werkst, 66: 39–49.
[5] Khademi, L. and Mohebby, B., 2011. Bioresistance of Poplar Wood Compressed by Combined Hydro-Thermo-Mechanical Wood Modification (CHTM). Soft-Rot and Brown-Rot, International Biodeterioration & Biodegradation, 65: 866-870.
[6] Hakkou, M., Petrissans, M., Ceradine, P. and Zoulalian, A., 2006. Investigation of the Reasons for Fungal Durability of Heat Treated Beech Wood. Polymer Degradation and Stability, 91 (2): 393-397.
[7] Varga, D. and Van der Zee, M.E., 2008. Influence of Steaming on Selected Wood Properties of Four Hardwood Species. Holz RohWerkst, 66 (1): 11–18.
[8] Jennings, J.D., Zink-Sharp, A., Frazier, C.E. and Kamke, F.A., 2006. Properties of Compression Densified Wood, Part II, Surface Energy, J. Adhes. Sci. Technol., 20 (4): 335–344.
[9] Gindl, M., Sinn, G., Reiterer, A. and Tschegg, S., 2001. Wood Surface Dependence of Wettability: A Comparison of Different Wood Surfaces Using an Acid-Base Approach, Holzforschung, 55: 433–440.
[10] Tsoumis, G., 1991. Science and Technology of Wood. Structure, Properties, Utilization. Van Nostrand Reinhold, New York. 64(6): 494.
[11] Kamke, F.A., 2007. Laminated Composites from Densified Wood. In: Proceedings of the 5th COST E34 International Workshop on Bonding of Modified Wood, Bled- Slovenia, September, 2007(6): 77-86.
[12] Dioufa, P.N., Stevanovicb, T., Cloutierb, A., Fangb, C.H., Blanchetc, P., Koubaad, A. and Mariottib, N., 2011. Effects of Thermo-Hygro-Mechanical Densification on the Surface Characteristics of Trembling Aspen and Hybrid Poplar Wood Veneers. Applied Surface Science, 257: 3558–3564.
[13] Šernek, M., Humar, M., Kumer, M. and Pohleven, F., 2007. Bonding of Thermally Modified Spruce with PF and UF Adhesives. In: Proceedings of the 5th COST E34 International Workshop on Bonding of Modified Wood, Bled- Slovenia, September, 2007(6): 31-37.
[14] Kutnar, A., Kamke, F.A. and Sernek, M., 2007. Bonding of Densified Hybrid Poplar with Phenol Formaldehyde Adhesive. In: Proceedings of the 5th COST E34 International Workshop on Bonding of Modified Wood, Bled- Slovenia, September, 6: 87-94.
[15] Hunt, C.G., Brandon, R., Ibach, R.E. and Frihart, R., 2007. What Does Bonding to Modified Wood Tell Us About Adhesion? In: Proceedings of the 5th COST E34 International Workshop on Bonding of Modified Wood, Bled- Slovenia, September, 16: 47-56.
[16] Ormstad, E.B., 2007. Gluing of Treated Wood with Dynea Adhesives. In: Proceedings of the 5th COST E34 International Workshop on Bonding of Modified Wood, Bled- Slovenia, September, 6: 11-12.
[17] Popescu, C.M. and Popescu, M.C., 2013. A near Infrared Spectroscopic Study of the Structural Modifications of Lime (Tilia cordata Mill.) Wood During Hydro-Thermal Treatment. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 115: 227–233.
[18] Lamason, C. and Gong, M., 2007. Optimization of pressing parameters for mechanically surface-densified aspen. Forest Prod. J. 57 (10), 64–68.
[19] Bekhta, P., Hiziroglu, S. and Shepelyuk, O., 2009. Properties of Plywood Manufactured from Compressed Veneer as Building Material. Materials and Design, 30: 947–953.
[20] American Society for Testing of Materials, ASTM D 905-03, 2003. Standard Test Methods for Strength Properties of Adhesives Bond in Shear by Compression Loading.
[21] Yang, T.H., Lin, C.H., Wang, S.Y. and Lin, F.C., 2012. Effects of ACQ Preservative Treatment on the Mechanical Properties of Hardwood Glulam. Euroupean Journal of Wood Products, 70 (5): 557-564.
[22] Standard Test Method for Determining Resistance to Delamination of Adhesive Bonds in Overlay-Wood Core Laminates Exposed to Heat and Water, ASTM D5824-98, 2003.
[23] Aydın, İ. and Çolakoğlu, G., 2002. The Effects of Steaming and Veneer Drying Temperature on the Weathering Reactions. In: Proceedings of the Wood Based Materials-Wood Composites and Chemistry International Symposium, Vienna, Austria, September, 8(16): 19–20.
 
Iranian Journal of Wood and Paper Industries
Volume 12, Issue 4
March 2022
Pages 537-550

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