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US 12,509,825 B2Granted
Screen cylinder with bars configured to receive a wear resistant spray coating
AssigneeAikawa Fiber Technologies Oy
InventorsMathieu Hamelin, Robert William Gooding, Benoit Martineau
Life of this patent
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Abstract
A screen cylinder includes a cylindrical screening media having an inflow side and an outflow side. The screening media is formed of a plurality of circumferentially spaced an axially extending wedgewire bars, which have an inflow surface facing the inflow side. The axially extending wedgewire bars have a profile shape optimized to apply a spray on wear resistant coating on their inflow surface.
Claims21
A screen cylinder comprising:
- a cylindrical screening media having a plurality of circumferentially-spaced axially extending slots formed between axially-extending bars, the screening media having an inflow side and an opposite outflow side;
- the bars each being formed of a base material comprising:
- an inflow facing surface,
- a first side surface having a first slot surface defining a slot,
- a second side surface having a second slot surface opposite the first side surface defining an adjacent slot, wherein a slot width is defined as the closest distance between the first side surface of a bar and the second side surface of an adjacent bar,
- the inflow facing surface being between the first side surface and the second side surface,
- a transition area connecting the second slot surface to the inflow facing surface and
- a ridge between the inflow facing surface and the first side surface;
- characterized in that
- the ridge i) is located more upstream a direction of flow than the transition area and ii) extends at a circumferential location at or past a location of the first side surface defining the slot width;
- wherein an angle formed by:
- i) a first plane extending axially and radially from the center of the cylindrical screening media to a circumferential location where the ridge of a first bar is closest an adjacent facing bar and ii) a second plane extending coplanar from the inflow facing surface of the adjacent bar at a location where the inflow facing surface of the adjacent bar meets the transition area of the adjacent bar facing the first bar is greater than or equal to 80 degrees;
- wherein a slope of the inflow facing surface measured between i) a line normal to a plane extending axially and radially from the center of the cylindrical screening medium and ii) a line tangential to a location on the inflow facing surface, is less than thirty degrees at all locations on the inflow facing surface;
- and
- wherein a portion of the axially extending bars comprises a spray-on wear resistant coating over the base material and on the inflow facing surface of the bars.
12 more elements
A screen cylinder comprising:
- a cylindrical screening media having a plurality of circumferentially-spaced axially-extending slots formed between a plurality of axially-extending bars, the screening media having an inflow side and an opposite outflow side;
- the bars each having an inflow facing surface, a first side surface having a first slot surface, and a second side surface having a second slot surface opposite the first slot surface, the inflow facing surface being between the first side surface and the second side surface, and a ridge between the inflow facing surface and the first slot surface;
- characterized in that the inflow facing surface of the axially extending bars comprises:
- a transition area proximate the second slot surface, the transition area connecting the second slot surface to the inflow facing surface,
- a first area of the inflow facing surface proximate the transition area, the first area extending towards the ridge and comprising a concave surface area, the first area having an area extending towards the ridge of increasing slope, the slope being measured between i) a line normal to a plane extending axially and radially from a center of the cylindrical screening medium and ii) a line tangential to a location or point on the inflow facing surface;
- a second area of the inflow facing surface adjacent the first area comprising a convex surface area, the second area having an area extending towards the ridge of decreased slope, the slope measures at a point on a plane tangential to the surface area from the support ring;
- wherein the ridge i) is located more upstream a direction of flow than the transition area and ii) extends at a circumferential location at or past a circumferential location where a transition area of an adjacent bar meets a second slot surface of the adjacent bar;
- and
- wherein the slope of the inflow facing surface is less than thirty degrees at all locations on the inflow surface.
6 more elements
Dependencies are inferred from the claim text.