Heat insulating boards producing metod

摘要

Method for the manufacture of thermal insulation boards with the addition of polyurethane foam waste and thermoplastics waste is characterised in that the polyurethane foam waste and thermoplastics waste is comminuted using a known comminuting means until grains of 2 to 8 mm in diameter are obtained, after which a blend containing 40 to 85% of polyurethane foam grains and 10 to 60% of thermoplastics waste grains is prepared and preferably combined with up to 15% by weight of synthetic and natural fibres and with up to 8% by weight of coherence-improving agents, such blend being then moulded in a known manner by pressing in moulds to form boards of desired geometrical dimensions, and the said boards being then pressed in a press at a temperature of more than 150°C in order to cure them, and finally the edges of the boards being trimmed using known means for mechanical working.