The filtrating slot in slotted cylinders, unlike in slotted tubes are positioned in parallel to the axis and crossbars make spirals or rings. There are two types of slotted cylinders.
STANDARD SLOTTED CYLINDERS- produced by rolling or pressing of flat slotted sieves.
-FITO (Flow In To Out) or FOTI (Flow Out To In) versions. The ends of crossbars are welded.
CONTINUOUS SLOTTED CYLINDERS- produced on specific appliance, in this construction filtrating slots are positioned in parallel to the axis and crossbars wrap spirally the profiles from outside.