Mechanized warp knitting devices, typically comprising a series of guide and drafting rollers, synthetic rubber aprons, a pressure arm, a roving bobbin, and a sliver can, designed to minimize sliver weight and width to a suitable size for subsequent yarn spinning and manufacture processes. Slivers are first fed to the device in large cans and subsequently exposed to weight and tension through a series of rollers before being passed through flyers which create a twist in the fiber strands; slivers are thus converted to thin roving, which is then fed into a ring frame for futher processing. Used as an intermediate step between the draw and ring frames, these devices strengthen the roving and prevent breakage during future processing.
