Sudut Kontak dan Keterbasahan Dinamis Kayu Samama pada Berbagai Pengerjaan Kayu
DOI:
https://doi.org/10.5614/jts.2017.24.3.3Keywords:
Keterbasahan dinamis, samama, sudut kontak.Abstract
Abstrak
Sudut kontak dan keterbasahan dinamis penting diketahui untuk menganalisis keteguhan rekat. Penelitian inibertujuan mengetahui sudut kontak dan keterbasahan dinamis kayu samama pada berbagai pengerjaan kayu.Metode yang digunakan adalah meneteskan air destilata, perekat UF dan isosianat dengan ukuran tertentu padapermukaan kayu hasil gergaji dan hasil mesin kupas. Permukaan kayu gergajian yang ditetesi oleh cairan adalahpermukaan radial, tangensial dan permukaan yang membentuk sudut 45antara radial dan tangensial. Sementaraitu permukaan finir hasil pengupasan adalah permukaan tight dan loose. Kayu gergajian maupun finir yangdianalisis pada penelitian ini, keduanya diambil dari bagian juvenil dan dewasa. Keterbasahan dinamis dianalisismenggunakan model SD. Hasil penelitian menunjukkan bahwa porositas permukaan bahan berpengaruh terhadapketerbasahan kayu samama oleh cairan. Permukaan tangensial memiliki sifat yang lebih mudah mengalamiketerbasahan dibandingkan dengan permukaan radial maupun TR (permukaan antara radial dan tangensial)sementara bagian juvenil memiliki tingkat keterbasahan lebih baik dibandingkan dewasanya. Finir samamamemiliki tingkat keterbasahan setara dengan permukaan TR kayu samama dimana bagian juvenil finir memilikilaju keterbasahan yang lebih baik dibandingkan dengan finir dewasa. Disamping itu, bagian loose finir lebih cepatterbasahi oleh cairan dibandingkan bagian tight.
Abstract
Contact angle and dynamic wettability is important in determining bonding strength, therefore, this study addressedcontact angle and dynamic wettability of samama wood in various woodworking. Method used in the study was bydripping distill water, UF and isocyanate adhesives in particular size on the surface of wood processed by circularsaw and peeling machine. The surfaces of sawn wood which dripped by those liquids were radial, tangential, andsurface which made a 45angle between radial and tangential. Meanwhile the tested surfaces of peeled-veneerwere tight and loose surfaces. Both sawn wood and veneer in this study were taken from juvenile and mature part ofthe samama wood. Dynamic wettability was analyzed using SD model. The results showed that porosity of thesurface significantly affected the wettability of samama wood by liquid. The profile of tangential surface made ithad a better wettability than radial and TR (i.e. surface between radial and tangential) surfaces. Meanwhile,juvenile part showed better wettability than the mature one. The samama veneer had equal wettability with TRsurface of sawn wood in which the juvenile one showed better wettability than the mature veneer. Further, it wasnoticed that loose surface of the veneer was wetted faster than the tight one.
References
Bryant, B., 1968, Interaction of wood surface and adhesive variables, For Prod J, 18(6):57-62.
Cahyono, T.D., Wahyudi, I., Priadi, T., Febrianto, F., Darmawan, W., Bahtiar, E.T., Ohorella, S., Novriyanti, E., 2015, The quality of 8 and 10 years old samama wood (Anthocephalus macrophyllus), Journal of the Indian Academy of Wood Science, 12(1):22-28, doi:10.1007/s13196-015-0140-8.
Cahyono, T.D., Wahyudi, I., Priadi, T., Febrianto, F., Ohorella, S., 2014, Analisis modulus geser dan pengaruhnya terhadap kekakuan panel laminasi kayu samama (Antocephallus macrophyllus), Jurnal Teknik Sipil, 21(2):121-128.
Darwis, A., Massijaya, M.Y., Nugroho, N., Alamsyah, E.M., Nurrochmat, D.R., 2014, Bond ability of oil palm xylem with isocyanate adhesive, Jurnal Ilmu dan Teknologi Kayu Tropis, 12(1):39-47.
Gardner, D.J., 2006, Adhesion mechanisms of durable wood adhesive bonds, Characterization of the cellulosic cell wall, 254-265.
Gavrilovic-Grmusa, I., Djiporovic-Momcilovic, M., Popovic, M., Popovic, J., Medved, S., 2013, Wetting properties of beech, fir and poplar Interacting with different molar-mass urea-formaldehyde Resins, Pro Ligno, 9(4):133-143.
Gavrilovic-Grmusa, I., Dunky, M., Miljkovic, J., Djiporovic-Momcilovic, M., 2012a, Influence of the degree of condensation of urea formaldehyde adhesives on the tangential penetration into beech and fir and on the shear strength of the adhesive joints, European Journal of Wood and Wood Products, 70(5):655-665.
Gavrilovic-Grmusa, I., Dunky, M., Miljkovic, J., Djiporovic-Momcilovic, M., 2012b, Influence of the viscosity of UF resins on the radial and tangential penetration into poplar wood and on the shear strength of adhesive joints, Holzforschung, 66(7):849-856, doi:10.1515/hf-2011-0177.
Gerardin, P., PetriA , M., Petrissans, M., Lambert, J., Ehrhrardt, J.J., 2007, Evolution of wood surface free energy after heat treatment, Polymer Degradation and Stability, 92(4):653-657.
Gindl, M., Reiterer, A., Sinn, G., Stanzl-Tschegg, S., 2004, Effects of surface ageing on wettability, surface chemistry, and adhesion of wood, Holz als Roh-und Werkstoff, 62(4):273-280.
Gray, V., 1962, The wettability of wood, For Prod J, 12(9):452-461.
Huang, X., Kocaefe, D., Kocaefe, Y., Boluk, Y., Pichette, A., 2012, Changes in wettability of heat-treated wood due to artificial weathering, Wood Science and Technology, 46(6):1215-1237.
Jennings, J.D., Zink-Sharp, A., Kamke, F.A., Frazier, C.E., 2005, Properties of compression densified wood, Part I: bond performance, Journal of adhesion science and technology, 19(13-14):1249-1261.
Jordan, D., Wellons, J., 1977, Wettability of dipterocarp veneers, Wood Science (USA), 10(1):220-228.
Lu, J.Z., Wu, Q., 2005, Surface and Interfacial Characterization of Wood-PVC Composite: Imaging Morphology and Wetting Behavior 1, Wood and Fiber Science, 37(1):95-111.
Lu, J.Z., Wu, Q., 2006, Surface Characterization of Chemically Modified Wood: Dynamic Wettability1, Wood and Fiber Science, 38(3):497-511.
Maldas, D.C., Kamdem, D.P., 1999, Wettability of Extracted Southern Pine, For Prod J. 49.
Monni, J., Alvila, L., Pakkanen, T.T., 2007, Structural and physical changes in phenol-formaldehyde resol resin, as a function of the degree of condensation of the resol solution, Industrial & Engineering Chemistry Research, 46(21):6916-6924.
Qin, Z., Gao, Q., Zhang, S., Li, J., 2014, Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods, BioResources, 9(2):3088-3103.
Rathke, J., Sinn, G., 2013, Evaluating the wettability of MUF resins and pMDI on two different OSB raw materials, European Journal of Wood and Wood Products, 71(3):335-342.
Scheikl, M., Dunky, M., 1996, Computerized static and dynamic contact-angle measuring methods in connection with wettability of wood, Holz Als Roh-Und Werkstoff, 54(2):113-117.
Shi, S.Q., Gardner, D.J., 2001, Dynamic adhesive wettability of wood, Wood and Fiber Science, 33(1):58-68.
Shupe, T.E., Hse, C.Y., Choong, E.T., Groom, L.H., 1998, Effect of wood grain and veneer side on loblolly pine veneer wettability, For Prod J, 48(6):95-97.
Staicopolus, D., 1962, The computation of surface tension and of contact angle by the sessile-drop method, Journal of Colloid Science, 17(5):439-447.
Tang, L., Zhang, R., Zhou, X., Pan, M., Chen, M., Yang, X., Zhou, P., Chen, Z., 2012, Dynamic adhesive wettability of poplar veneer with cold oxygen plasma treatment, BioResources, 7(3):3327-3339.
Wei, S., Shi, J., Gu, J., Wang, D., Zhang, Y., 2012, Dynamic wettability of wood surface modified by acidic dyestuff and fixing agent, Applied Surface Science, 258(6):1995-1999.
Yuan, Y., Lee, T.R., 2013, Contact angle and wetting properties, Surface Science Techniques, Springer: 3-34.
