Ph.D. Tezi Görüntüleme

      In this study, the effects of some manufacturing factors such as log steaming, veneer drying temperature, sanding, impregnation and weathering on the surface roughness, adhesive wettability, pH and buffer capacity of rotary cut veneers obtained from beech (Fagus orientalis Lipsky), alder (Alnus glutinosa subsp. barbata) and spruce (Picea orientalis L.) were investigated. The effects of these factors on the bonding strength, bending strength and equilibrium moisture content of plywood panels were also determined.

      Boron compounds (borax and boric acid) as fire retardants and ammonium acetate as formaldehyde scavenger were used in impregnation process. Urea formaldehyde (with 55% solid content) and phenol formaldehyde (with 47% solid content) were used as adhesive both for the plywood manufacturing and wettability measurements.

      Some of the veneers obtained were exposed at laboratory conditions to evaluate the effects of indoor weathering on some properties of veneers and plywood. Three different weathering periods were chosen as 1 month, 3 months and 6 months. Also, the surfaces of some veneers were sanded with 100 and 180 grit sandpapers after drying process.

      The results indicated that the effects of the manufacturing factors investigated in this study showed variety depending on the wood species, log steaming and veneer drying temperatures. Generally, while the veneer drying temperature risen, adhesive wettability, bonding ability and moisture content values were decreased and the surface roughness values were increased.

      Keywords: Adhesive Wettability, Contact Angle, Surface Tension, Surface Roughness, Impregnation, Veneer Drying Temperature, Weathering, Plywood Properties