Patent ID: 8905329

Claim:
Spraying device comprising: a casing enclosing at least one chamber having a nozzle at one end; radial openings or channels for feeding reactive basic components in a fluid state of a polymer mixture, said openings or channels being provided on a surface of said at least one chamber, whereby said basic components contain additives depending on the application or use of the mixture; a mixing screw with a helical profile extending along the axis of said at least one chamber; means for operating the mixing screw so as to cause it to rotate about said axis and move linearly along the axis; wherein an end diameter of the mixing screw in front of the nozzle is same as diameter of the nozzle; a ring comprising a free head encircles with a calibrated radial clearance a portion of the one end of the casing and has a position adjustable along axis of rotation of the mixing screw, the ring being provided with openings for introducing pressurized air onto mixture discharged by the nozzle through a front clearance and being calibrated so as to pulverize or atomize the mixture so that it can be sprayed; clearance between an inner surface of the at least one chamber of the casing and crest of the helical profile of the mixing screw is constant and has a value of less than 1 millimeter; and further comprising metering valves for introducing the basic components into said at least one chamber.