STONE BASED SANDWICH PANEL AND ITS MANUFACTURING PROCESS

摘要

Sandwich panel consists of face stone layer (1) of 5 to 20 mm thickness and botom layer (2) of cured polyurethane foam of 5 to 100 mm thickness and 45 to 500 kg/m3 density that are bonded together. Polyol component which polyurethane material is made of contains minimum 20% of polyol mass made on the base of plant oils. In bottom layer (2) of cured polyurethane foam material grid (3) of mineral or organic fibres is advantageously situated in the depth of 0.2 to 10 mm under the external surface of sandwich panel bottom layer (2). The manufacturing process of the sandwich panel consists in the procedure when bottom layer of cured polyurethane foam is formed by mould injection where grid (3) is advantageously stretched in. Foamed polyurethane material is allowed to cure in the mould the size of which corresponds with bottom layer of cured foam of polyurethane mass.