The Effect of Some Production Factors on the Formaldehyde Emission of Poplar Plywood

Authors: Gürsel ÇOLAKOĞLU, Yalçın ÖRS

Abstract: in the laboratory conditions, rotary cut veneer was produced with 1.4 and 2.1 mm thicknesses from logs of poplar (P. x euramericana 45/51). Plywood were made with three plies by using UF-resins. The effects of veneer thickness, press pressure, press time, formaldehyde mole ratio and proportion of urea, filter and extender were investigated by WKi-bottle method as iodometrically to determine the formaldehyde emission of poplar plywood. Results have shown that formaldehyde emission decreases with increasing veneer thickness, proportion of extender, urea, press time, press pressure, and the use of urea formaldehyde resin with low formaldehyde proportion, however, the type of fillers did not show any effect on the formaldehyde emissiion.

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