Simplex / Roving

The simplex or roving frame is an intermediate spinning process that reduces the draw frame sliver to a roving (a slightly twisted strand) suitable for feeding to the ring frame. The roving frame applies a small amount of twist to give the roving enough strength for winding onto bobbins.

Production depends on spindle speed, number of spindles, TPI (twists per inch), and roving hank. Higher TPI means more twist, which reduces production. Finer roving hank also reduces production rate. Machine efficiency accounts for downtime due to breaks, creeling, and doffing. Typical simplex efficiency ranges from 75-90%.