Travelling polyurethane foam sprayer - with several nozzles travelling on one transverse rail

摘要: An appts. for spraying polyurethane foam in a layer on sub-base, e.g. to form frost-insulating between sub-base and road topping, comprises transverse guide rail which two or more nozzles move; the control system ensures that, when one nozzle has reached end of its travel, adjacent commenced travel away from same point, while first returns along path, without spraying. By using several travelling single rail, large width can be continuously sprayed.