METHOD OF PRODUCING THE ROOFING TILE AND CREST TILE Russian patent published in 1999 - IPC

FIELD: civil engineering. SUBSTANCE: method includes fractionation of sand with selection of fraction with particles sizing up to 3 mm, heating of sand up to 250-450 C for 15-30 min; fractionation of wastes of polyolefins with selection of fraction with particles sizing up to 10 mm; mixing with introduction into sand of polyolefins wastes and service substances with the following ratio of components in mixture, wt.%: sand, 70-79; polyolefin wastes, 20-30; service substances, 0.1-10; with subsequent molding at 130-200 C and pressure of 20-60 kg/sq.cm and cooling for 3-18 h. Crest tile is made from molding mixture based on mixture of sand with polyolefin wastes in the form of hollow semicylinder with crests and hole for fastening to roof boarding. There are two perpendicular axes of crest cylinder on one side of semicylinder with sizes of internal hollow ensuring touching of internal walls of semiring by crests when semiring is placed on crest. EFFECT: improved mechanical-and-physical and service properties of roofing tile. 3 dwg