Nozzle
AssigneeMetso Paper, Inc.
InventorsVilho Nissinen, Mika Linjamäki
Life of this patent
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Abstract
A nozzle (1) for use in coating a web-like material by means of high-pressure spraying techniques is manufactured by forming a piece having a tapered duct ending in a closed tip, with a transverse V-shaped groove (3) subsequently machined in the tip. The angle of the V-shaped groove (3) is in the range from 25 to 50°, such as 35 to 45°.
Claims20
An array of nozzles for use in coating by high-pressure spraying techniques a web of material moving in a first direction, the array of nozzles comprising:
- at least one row of a plurality of secondary spray nozzles oriented transverse to the first direction;
- wherein each secondary spray nozzle has portions defining a tapered duct, tapering to a closed tip in which a V-shaped groove has been machined, the V-shaped groove defining a secondary nozzle orifice defining a transverse nozzle orifice area, the secondary nozzle orifice arranged to form a jet of coating material;
- and
- wherein the V-shaped groove has a first side and a second side which intersect to define an angle which is between 25 to 50 degrees;
- wherein each secondary spray nozzle is connected to a preliminary nozzle, and wherein the preliminary nozzle starts from a preliminary nozzle orifice which leads into an expanding duct, the expanding duct being connected to the tapered duct of the secondary spray nozzle so that a flow into the preliminary nozzle orifice leads into the expanding duct of the preliminary nozzle and then into the tapered duct of the secondary spray nozzle and then to the secondary nozzle orifice.
An array of nozzles with reduced wear characteristics for use in coating by high-pressure spraying techniques a moving web of paper or cardboard mounted for motion in a first direction, the array of nozzles comprising:
- at least one row of a plurality of secondary spray nozzles which are arrayed transverse to the first direction;
- wherein each secondary spray nozzle has portions defining a tapered duct which tapers to a tip which is closed but for portions of the nozzle forming a transverse V-shaped groove which intersects the tip, thereby defining a secondary nozzle orifice which defines a transverse nozzle orifice area, the secondary nozzle orifice arranged to form a jet of coating material;
- and
- wherein the V-shaped groove has a first side and a second side which intersect to define an angle which is between 25 to 50 degrees;
- wherein each secondary spray nozzle is connected to a preliminary nozzle, so that the tapered duct of the secondary spray nozzle is in flow receiving relation to portions of the preliminary nozzle forming an expanding duct which starts from and is in flow receiving relation to portions of the preliminary nozzle forming a flow orifice, the flow orifice defining an area, the flow orifice in flow receiving relation to a supply of coating at a pressure between 1 MPa and 200 Mpa.
Dependencies are inferred from the claim text.