Abstract
It is very important to utilize oil palm petiole fo r the production of zephyr boards. This study aimed to analyze the effect of layer orientation on zephyr board quality. Zephy r boards were made with three coating patterns (A = cross perpendicular, B= combine A and C, and C= paralell) and five zephyr layers using urea formaldehyde adh esive. They were pressed for 20 min at a pressure of 25 kgf/cm≤ and a temperature 120 oC, to a target density of 0 .80 g/cm≥ and a size of 300 mm X 300 mm X 12 mm. Our results showed that the physical and mechanical properties fulfil led the standards of JIS A 5908-2003. The best physical pro perties were found in the type C layer pattern, whi ch had a density of 0.82 g/cm≥, Mouisture Content of 9.46%, Water Absorpsion of 16.49%, and Thickness Swelling of 16.49%. The best mechanical properties—Modulus Of Elasticity and Modulus Of Repture —were also found in the type C layer pattern, with values of 35.2 x 10 -3 kgf/cm≤ and 603.9 kgf/cm≤, respectively. However, the best IB and screw holding strength (SW) results were found with the type B layer pattern (I nternal bonding B of 38.65 kgf/cm≤, Screw Withdrawl of 145.11 kgf).
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