Roving
Also searched as: rove, simplex, speed frame, flyer frame, roving frame, slubbing
Roving is an intermediate fiber strand, finer than sliver and held together by a small protective twist or by rubbing, that feeds the ring spinning frame.
In detail
In the cotton ring-spinning route, drawn sliver is too thick to go straight to the spinning frame, so a roving frame (also called simplex, speed frame or flyer frame) draws it down further. The machine performs three tasks: drafting between rollers, inserting a low twist with a rotating flyer, and winding the strand onto a bobbin. That twist is only enough to let the fragile strand survive winding, unwinding and creel handling, since the ring frame's drafting rollers must still be able to draw it out.
The science and numbers
Typical cotton roving frames apply a draft of roughly 6 to 15, insert about 30 to 65 turns per meter, and run flyers at around 700 to 1,300 rpm. Because the bobbin grows as it fills, the winding speed must be adjusted continuously so that roving tension stays constant as package diameter increases; older frames did this with mechanical differential gearing and newer ones with separately controlled drives. Twist is a compromise: too little lets the roving stretch and break in the creel, while too much makes it resist drafting at the ring frame. For this reason the roving stage is often described as a necessary but costly step in ring spinning.
A practical example
A trainee in a cotton mill sees large bobbins of soft, thick strand hanging in the ring frame creel. Pulled gently, the strand drifts apart rather than snapping, because it carries only a few dozen turns per meter. That weakness is intentional: the drafting rollers of the ring frame need the fibers to slide past one another before the final twist is inserted.
What to distinguish
Roving is not yarn and is not meant to go into fabric. The word is used more loosely elsewhere: hand spinners may call a thick, untwisted fiber preparation roving, and in composites glass-fiber roving is a bundle of continuous filaments. Rotor spinning feeds drawn sliver directly, so a rotor-spun yarn has no roving stage at all.
Origins and history
The word roving has long been used in English for a lightly twisted strand prepared for spinning, and the flyer that twists it is a descendant of the flyer on the treadle spinning wheel. Cotton mills once used a sequence of slubbing, intermediate and roving frames to reach the right fineness; modern practice usually condenses this into a single simplex step between the drawframe and the ring frame.
Related terms
Sources & further reading
- Textile School: Simplex frame and its parts
- Textile Learner: Roving frame, description and material passage
- Textile Apex: Why the simplex/roving frame is a necessary evil
Technical references reviewed 2026-09-22. Examples are illustrative. Industry organizations and manufacturers describe their own fields; their references are not independent product endorsements. Figures are approximate and depend on the stated test conditions.