EFFECTS OF HEAT-TREATMENT AND VARNISH APPLICATION ON THE COLOUR CHANGE OF PINE AND ASH LAMINATED VENEER LUMBERS


Creative Commons License

Şahin Kol H. , Aysal Keskin S. , Gündüz Vaydoğan K.

Journal of Advanced Technology Sciences, cilt.8, ss.28-34, 2019 (Diğer Kurumların Hakemli Dergileri)

  • Cilt numarası: 8 Konu: 2
  • Basım Tarihi: 2019
  • Dergi Adı: Journal of Advanced Technology Sciences
  • Sayfa Sayıları: ss.28-34

Özet

Heat treatment temperatures and varnish effects on colour properties of pine (Pinus sylvestris L.) and ash (Fraxinus americana) laminated veneer lumbers (LVL) were evaluated. In the first instance the wood lumbers were exposed to heat treatment with the temperatures of 190 and 212 ºC for 1.5 and 2 h, respectively. After heat treatment process, LVLs were manufactured from heat treated pine and ash veneers with polyurethane (PU) and melamine urea –formaldehyde (MUF) adhesives and one surface of them varnished with yacht varnish. A spectrophotometer was employed to determine colour change of heat-treated and varnished specimens. The samples had significant discoloration as a result of heat exposure and varnish application. Colour difference of the specimens increased as a result of all treatment temperatures. Varnish application caused a significant colour change for both tree species.