Abstract:

This study aims to determine the effects of the use of the yongs of the Katsura tree (Cercıdıphyllum japonıcum) in the production of yongalevha on the physical and mechanical properties. In this scope, butter straw (Pinus Pinea L.) and katsura yongs are used as raw materials. During production, Katsura yongs were added as 0.%, 25%, 50%, 75 and 100%. The size of the produced sheets is 42.5 x 42.5 x 1.2 cm and the specific weights are 0.650 g/cm3. The press temperature used is 150 °C. Pressure 23-25 kp/cm2 is applied on the leaves, and the pressure time is 7 min. The 65% urine formaldehyde (UF) bind was used as a bind, and ammonium sulfate was added to the bind as a hardening. Sheet samples have determined the characteristics of rotating (TS EN 322), density (TS EN 323/1), water absorption and thickness increase (ASTM D1037, TS EN 317), inclination resistance and inclination elasticity module tests (TS EN 310) with the surface drawing resistance (TS EN 319). According to the results obtained, the rubbett values were found between 8-10%. The use of 25 percent, 50 percent and 75 percent of Katsura yongs has positively influenced water absorption and thickness increase values. There was no significant change in intensity values. In general, with the use of the katsura yong has occurred a decrease in the values of inclination resistance, inclination elasticity module values and the values of direct drawing resistance to the surface.

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