Method for making a mechanical screen cylinder

A method of manufacturing a cylindrical mechanical filter basket for centripetal or centrifugal flow, the basket comprising metal rings spaced apart along an axis of the basket and wires regularly spaced apart from one another and disposed around the periphery of the rings to form a cylindrical sieve, the method being characterized in that it comprises the steps of:

• a) providing shaped rings each having an annular core, an annular rim of smaller thickness than the annular core, at least one annular shoulder between the annular rim and the annular core, and notches regularly spaced apart in the rim;
• b) placing wires in the notches of the shaped rings so that the wires are disposed regularly spaced apart one another around the rings;
• and
• c) moving a heat source along the shoulder of each ring, the source being at a temperature that is high enough to melt the shoulder so that molten metal from the shoulder provides a weld between each wire and ring without any external filler metal.