Effect of Using Urea Formaldehyde Modified with Extracts in Plywood on Formaldehyde Emission

Formaldehyde-based adhesives are used in the forestry industry. This is because formaldehyde inexpensive, easy to use and resistant moisture; it also has particular mechanical effects. Formaldehyde both advantages disadvantages. It known that various diseases such as lung cancer occur humans a result of release into air during after board production. In this study, urea glue mixture was prepared by using four different fillers (extract maritime pine (Pinus pinaster) elm (Ulmus glabra) bark, extract hazelnut (Corylus avellana) husk acorn tannins) at two ratios. The bonding shear strength sylvestris) spruce (Picea orientalis) plywood produced with adhesive tested according EN 314-1 standard. All plywood, except tannin, met requirements A emission test carried out accordance 713-3 With approach, possible quickly determine emissions. Experimental results were obtained for subsequent measurements, including chamber tests. observed bark reduced 40 %, while other 3-37 %.