EFFECTS OF SANDING AND VARIOUS SURFACE SMOOTHING PROCESSES ON SURFACE ROUGHNESS AND VARNISH ADHESION OF BEECH, OAK AND PINE MASSIVE PARQUETS

Yıl 2020, Cilt: 11 Sayı: 2, 119 - 125, 01.06.2020

Ismail Aydın Aydin Demır Turgay Ozdemır

Öz

The objective of this study was to determine effects of sanding and various surface smoothing processes on surface roughness and varnish adhesion of beech, oak and pine massive parquets. First of all, the parquet samples were classified into four groups. Fifteen parquet samples were used for each group. Parquet samples in first group were processed on thickness machine, samples in second group were processed on plane machine, and samples in third group were sanded with 60 grit sandpaper while the parquets in fourth group were sanded with 180 grit sandpaper, parallel to grain direction. The surface roughness of the samples were determined according to DIN 4768. After surface roughness measurements, parquet samples were coated with cellulosic varnish by using a spray gun at a spread rate on 120 g/m2. The adhesion of strength of the parquet samples were determined according to ASTM D 4541. According to the study results, the highest surface roughness values were obtained in oak, and there was no statistical difference between beech and pine. The adhesion strength values of beech parquets were higher than pine and oak parquets. Processing of sanding with lower grit sandpaper resulted in increased surface roughness while improved adhesion strength characteristics between the coating and the substrate.

Anahtar Kelimeler

Surface roughness, adhesion strength, parquet, sanding, varnish

Kaynakça

• [1] Williams S., (2010). Finishing of wood, Wood handbook—Wood as an engineering material, Chapter 16, General Technical Report FPL–GTR–190. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 16-1, p. 33.
• [2] Ozdemir T., Hiziroglu S. and Kocapınar M., (2015). Effect of heartwood and sapwood ratio on adhesion strength of finished wood species, Advances in Materials Science and Engineering, 2015, 1-5.
• [3] Nikolic M., Lawther J. M. and Sanadi A. R., (2015). Use of nanofillers in wood coatings: a scientific review, Journal of Coatings Technology and Research, 12, 3, 445-461.
• [4] Ratnasingam J., Reid H.F. and Perkins M.C., (2002). The abrasive sanding of rubberwood (Hevea brasiliensis): an industrial perspective, Holz als Roh- und Werkstoff, 60, 191–196.
• [5] Carlson R., Donegan V., Fantozzi J., Lewandowski E., Sherwood G., Smith J. and Tooley J., (1991) Application recommendations for smooth, embossed and saw-textured surfaces - current state - of-the-art, Joint Coatings/Forest Products Committee publication.
• [6] Aydin I., (2004). Activation of wood surfaces for glue bonds by mechanical pre-treatment and its effects on some properties of veneer surfaces and plywood panels, Applied Surface Science, 233, 1/4, 268-274.
• [7] Bulian F. and Graystone J.A., (2009). Operational aspects of wood coatings: Application and surface preparation. In: Industrial Wood Coatings-Theory and Practice, Chapter 9, Elsevier, Oxford, pp 259-288.
• [8] DIN 4768, (1990). Determination of values of surface roughness parameters Ra, Rz, Rmax using electrical contact (stylus) instruments, concepts and measuring conditions. Deutsches Institut für Norming. Berlin, Germany.
• [9] ASTM D, 4138 (1971). Test method for measurement of dry film thickness of protective, ASTM, Philadelphia.
• [10] ASTM D, 4541 (1978). Test method for pull-off strength of coatings using portable, ASTM, Philadelphia.
• [11] Salca E. A. and Hiziroglu S., (2014). Evaluation of hardness and surface quality of different wood species as function of heat treatment, Materials & Design (1980-2015), 62, 416-423.
• [12] Thoma, H., Peri, L., and Lato, E., (2015). Evaluation of wood surface roughness depending on species characteristics, Maderas. Ciencia y tecnología, 17, 2, 285-292.
• [13] Sulaiman O., Hashim R., Subari K. and Liang C.K., (2009). Effect of sanding on surface roughness of rubberwood, Journal of Materials Processing Technology, 209, 8, 3949-3955.
• [14] Hiziroglu S., Zhong Z.W. and Ong, W.K., (2014). Evaluating of bonding strength of pine, oak and nyatoh wood species related to their surface roughness, Measurement, 49, 397-400.
• [15] Söğütlü C., Nzokou P., Koc I., Tutgun R., and Döngel N., (2016). The effects of surface roughness on varnish adhesion strength of wood materials, Journal of Coatings Technology and Research, 13, 5, 863-870.
• [16] Jaić, M. Živanović R., Stevanović-Janežsć T. and Dekanski A., (1996). Comparison of surface properties of beech-and oakwood as determined by ESCA method, Holz als Roh-und Werkstoff, 54, 1, 37-41.
• [17] Ozdemir T. and Hiziroglu S., (2009). Influence of surface roughness and species on bond strength between the wood and the finish, Forest Products Journal, 59, 6, 90-94.
• [18] Sonmez A. Budakci M. and Bayram M., (2009). Effect of Wood Moisture Content on Adhesion of Varnish Coatings, Sci. Res. Essays, 4, 12, 1432–1437.
• [19] Frihart C. R., (2005). Wood Adhesion and Adhesives. Handbook of Wood Chemistry and Wood Composites, Rowell, Roger M. (editor), CRC Pres, pp. 215 - 273.
• [20] Vitosytė J., Ukvalbergienė K., and Keturakis G., (2012). The effects of surface roughness on adhesion strength of coated ash (Fraxinus excelsior L.) and birch (Betula L.) wood, Materials Science, 18, 4, 347-351.