INFLUENCE OF THE CHEMICAL COMPONENTS OF VINE VARIETIES ON THE PROPERTIES OF PARTICLE BOARDS
Abstract - The use of by-products of agricultural and forestry activity, apart from many other environmental benefits, constitutes an alternative source of income or cost reduction and supports the principles of circular economy. In the Valencian Community, the area devoted to growing vineyards is 73,095 hectares. The periodic maintenance of the crop is carried out through winter pruning from December to March. These prunings are burned or crushed and incorporated into the soil, causing environmental contamination and disease transmission. The aim of this study was to determine the influence of the chemical composition of three vine varieties (Bobal, Garnacha and Monastrell) on the properties of particleboards made with those varieties. In the manufacturing of these boards, grapevine particles without binder with two particle sizes (< 0.25 mm and 0.25-1 mm) and two pressing time cycles (15 min and 15 + 15 min) were used as raw material, obtaining 4 particleboards of each type, hence 48 boards were made. The chemical composition (% tannins and % sugars) of the raw material and the manufactured board were analyzed, as well as the properties of thickness swelling, modulus of rupture, modulus of elasticity and internal bonding strength, following the European Standards applicable to wood particleboards. The best mechanical properties were obtained with the Monastrell variety, since its initial chemical composition has higher percentages of sugars. Therefore, it can be concluded that the higher the amount of sugar, the higher the mechanical properties values are.
Keywords - Bobal, Garnacha, Monastrell, Mechanical Properties, Agricultural Waste.