Faculty of Forestry and Wood Technology, University of Zagreb
Abstract
This paper deals with problems of the effect of changes in density and amount of glue on mechanical properties of OSB (oriented strand boards). Tests of mechanical properties were carried out on OSB/3, 18 and 15 mm thick, produced on an OSB production line of the prominent manufacturer of board composite materials in the Czech
Republic. In the first stage of the experiment, density was decreased in manufactured OSB with a nearly the same amount of glue. In the second stage, density was constant and the amount of glue changed. Bending strength, modulus of elasticity and tensile strength perpendicular to the board surface were determined in OSB samples of particular variants. Results of laboratory tests were compared with values given by the ČSN EN 300 standard for category OSB/3.U radu se analizira utjecaj gustoće ploča i količine ljepila na mehanička svojstva ploča s usmjerenim iverjem – OSB ploča (Oriented Strand Boards). Mehanička svojstva mjerena su na pločama OSB/3, debljine 18 i 15 mm, koje je proizveo priznati proizvođač kompozitnih drvnih materijala u Republici Češkoj. U prvoj fazi eksperimenta proizvedene su ploče različite gustoće, uz približno jednaku količinu ljepila. U drugoj fazi proizvedene su ploče konstantne gustoće i s različitom količinom ljepila. Izmjerena je savojna čvrstoća, modul elastičnosti i vlačna čvrstoća okomito na površinu ploče svih ploča. Dobiveni rezultati uspore|eni su s vrijednostima koje su dane normom ČSN EN 300 za kategoriju ploča OSB/3
