Seamless screen cylinder with laser cut openings

Details Seamless screen cylinder with laser cut openings Seamless screen cylinder with laser cut openings

B - Operations, Transporting

23

K

327/1.6

B23K 26/00 (2006.01) B23K 26/36 (2006.01) B23K 26/38 (2006.01)

Patent

CA 2029515

Screen cylinders for removing contaminant particles from papermaking stock are formed with a seamless cylinder body (12). The body (12) is formed by centrifugal casting or by cold roller extrusion. A plurality of closely spaced screening holes or slots (25) are formed in the wall (20) of the cylindrical section (12) by laser cutting, by directing a focused laser beam at an outer surface (32) of the wall (20) while focusing the beam at a location intermediate the outer surface (32) and the inner surface (30), to form a slot (25) which has tapered walls (40). The walls (40) are formed or defined by smooth glassy recast surfaces and are harder than the body. Wear bars (35) may be applied to the inside surface (30) in the form of a bead or beads of weld material.

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