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US 8,905,329 B2Granted
Method and device for spraying mixtures obtained from the reaction of polymer materials
AssigneeStemma Srl
InventorEttore Bordin
Life of this patent
Estimating the term…
Abstract
A method and a device for producing a thin article or a thin coating on a previously manufactured solid body. At least two reactive polymer materials are mixed together thoroughly and die resultant mixture is discharged via a nozzle in the form of a thin tube. This thin tube is pulverized or atomized by means of the introduction of a controlled flow of pressurized air with the result that die pulverized mixture may be sprayed onto an open mold or onto a surface or onto a previously manufactured solid body which is to be coated.
Claims10
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.
6 more elements
Dependencies are inferred from the claim text.