Wear resistant spray coating of screen cylinders by varying the spray angle
AssigneeAikawa Fiber Technologies Oy
InventorsMathieu HAMELIN, Robert William GOODING, Benoit MARTINEAU
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Abstract
A screen cylinder includes a cylindrical screening media formed of a plurality of circumferentially spaced an axially extending wedgewire bars, which have an inflow surface facing an inflow side. The axially extending wedgewire bars have a profile shape optimized to apply a spray on wear resistant coating on their inflow surface using a spray nozzle. To apply the coating the angle of the spray nozzle is varied in the circumferential direction relative to the inflow side of the screening medium to change the spray angle of the nozzle to apply the coating sprayed on the bars.
Claims17
A method of manufacturing a screen cylinder comprising:
- forming a cylindrical screening medium by arranging a plurality of circumferentially-spaced, axially-extending bars having slots therebetween, the screening medium having an inflow side and an outflow side, wherein the individual bars have:
- an inflow surface, a first slot surface, a second slot surface opposite the first slot surface, where the inflow surface is between the first slot surface and second slot surface;
- applying a wear resistant coating on the inflow surface of the bars using a spray nozzle by passing the spray nozzle multiple times along a length of the screening medium resulting in spray passes of the spray nozzle wherein the wear resistant coating is sprayed through the spray nozzle onto the inflow surface of the bars during passes of the spray nozzle;
- and
- varying the angle of the spray nozzle in the circumferential direction relative to the inflow side of the screening medium to change the spray angle of the nozzle applying coating sprayed on the bars.
A method of manufacturing a screen cylinder comprising:
- forming a cylindrical screening medium by arranging a plurality of circumferentially spaced axially extending bars having slots therebetween, the screening medium having an inflow side and an outflow side;
- applying a wear resistant coating on inflow surfaces of the bars using a spray nozzle by passing the spray nozzle multiple times along the length of the screening medium resulting in spray passes of the spray nozzle wherein the wear resistant coating is sprayed through the spray nozzle onto the inflow surfaces of the bars during passes of the spray nozzle;
- and
- wherein an angle formed by the spray nozzle is varied by rotating the spray nozzle circumferentially from a transition area adjacent a second slot surface of a bar towards a ridge proximate a first slot surface of the same bar, the ridge being located a radial distance more towards the inflow direction than the transition area a total of between 0 and 35 degrees, the ridge being located a radial distance more towards the inflow direction than the transition area.
Dependencies are inferred from the claim text.