The floor
Bale to cone, department by department: what each machine does, what physically leaves it, and where the information about your yarn breaks down.
Cans on the floor to the speed frame. Roving overhead to the ring frame. Cops across the link into the winder.
How it becomes yarn
Ring spinning puts two stages between the can and the yarn. The other three put none — the can is creeled straight into the spinning machine, so whatever is in it becomes yarn in one step.
Three of the four are sliver-fed. On those floors preparation is not a stage on the way to yarn — it is the last place anyone can still get the yarn right.
Can → Speed frame → Roving bobbin → Ring frame → Cop → Winding → Cone
Two stages between the can and the yarn, and the draft setting at each one assumes a hank the material may no longer have. The longest route, the finest counts, and the only one where roving and spindles exist to be tracked.
Can → Rotor → Cone
The can feeds the rotor. No speed frame, no roving, nothing in between — and a rotor line runs many times faster per position than ring spinning, so more yarn is made from a bad can before anyone notices.
Can → Vortex nozzle → Cone
Also creeled straight from the can, and among the fastest routes in the mill. Air-vortex twisting depends on the sliver arriving as specified, so a deviation disturbs the twisting itself and not only the count.
Can → Twin nozzle → Cone
Widely run on polyester blends, where buyers hold count tolerances contractually. Blend lots are exactly where a downgrade costs most.
How the sliver is prepared
Which one a mill runs depends on the count it spins, and it changes almost everything about the economics. Whichever spinning system follows, every route shares this preparation — and on a sliver-fed floor nothing after the finisher draw frame gets a second chance at the sliver.
The departments below follow the ring route, because it is the longest. Every other route is a shorter path through the same preparation, and the can that leaves the finisher draw frame is the last object anyone can still check.
Blowroom → Carding → Breaker draw frame → Finisher draw frame → Speed frame → Ring frame → Winding
Coarser counts, high volume, and the shorter path. Roughly nine kilograms of yarn from every ten of sliver.
Blowroom → Carding → Breaker draw frame → Lap former → Comber → Finisher draw frame → Speed frame → Ring frame → Winding
Finer counts, premium yarn, and two extra passages. Combing removes short fibre, so far less of the sliver survives as yarn — which is why the same recovery percentage is worth a very different amount on the two routes.
Department by department
Bale opening and mixing
Bales are opened, laid down in a mixing and cleaned. Beaters break the compressed cotton into progressively smaller tufts while trash and dust are extracted.
What leaves
Opened, cleaned fibre, blown by chute feed to the cards — or laid into laps on older lines.
Where the information breaks
Which bales, in what proportion, laid down when — a decision that reaches the cone, recorded on paper and carried forward by nothing physical.
The heart of spinning
Fibres are individualised between cylinder and flats, short fibre and neps removed, and the web condensed into one continuous rope. Everything downstream inherits what happens here.
What leaves
Card sliver, coiled into a can. This is the first time the material takes a form a person carries.
Where the information breaks
The can leaves holding sliver and no identity. Until the yarn is tested, the only record is a chalk mark or somebody's recollection.
Closed by AICAN
Breaker and finisher drawing
Six to eight slivers are fed in and drafted back to one. Doubling averages out variation, drafting parallelises the fibres, and autolevellers correct thick and thin places.
What leaves
Drawn sliver, again into cans — the material that feeds the speed frame.
Where the information breaks
Cans in, cans out. Put up the wrong one and the frame runs perfectly happily, producing perfectly wrong sliver. Nothing is looking for that mistake.
Closed by AICAN
Lap former and comber — combed counts only
Slivers are formed into a lap, then the comber removes short fibre, neps and residual trash. The most expensive quality step in the mill: a meaningful share of the material leaves as noil.
What leaves
Comber sliver into cans, on to the finisher draw frame.
Where the information breaks
Noil extraction and lap quality vary comber to comber and shift to shift. Attributing a downstream defect to one head means reading a hand-written log.
Closed by AICAN
Simplex, roving frame
Sliver is drafted down and given just enough twist to survive handling, then wound onto a bobbin. One frame builds many at once, each on its own spindle, each fed by its own can.
What leaves
Roving bobbins, doffed and moved to the ring frame creel, often by an overhead transport system.
Where the information breaks
A bobbin is built on one spindle, fed by one can, by one drafting assembly with its own condition. Then it is doffed, and every trace of which spindle made it disappears.
Closed by AIBOA
Where yarn is actually made
Roving is drawn from the creel, drafted to final count, and twisted by a traveller running on a ring. A modern frame carries well over a thousand positions, each an independent little machine.
What leaves
Ring cops — small, dense packages of spun yarn, doffed together.
Where the information breaks
The sensing sits at the spindle; the intelligence sits in a board serving a whole section. A dead board blinds twenty-four positions, and a break travels to a machine station and back before anything stops.
Closed by AIRing
Autoconer
Cops are rewound into large cones. An electronic clearer inspects the yarn as it passes and cuts out faults — thick places, thin places, foreign fibre — and a splicer joins it back together.
What leaves
Cones. The saleable product, and the first time anyone sees the yarn properly.
Where the information breaks
Where a mill finds out, the last place it can act, and by far the most expensive. The waste is hard waste, which cannot go back into the line the way soft waste can.
Glossary
Sliver, roving, doff, hank, ends down — the words a spinning floor uses
Read the glossaryThree breaks in the chain
The machine builders have spent a century perfecting what happens inside each frame. Nobody has instrumented the material that walks from one to the next.
Close all three and a defect at the cone traces back to the bale. Close one and you have removed a source of loss, which is worth doing on its own.
Card → speed frame
The can carries no identity and no knowledge of its own contents. Everything here is tracked by hand, or not at all.
AICANSpeed frame → ring frame
The roving bobbin loses its spindle of origin the moment it is doffed. If it is bad, it quietly degrades every cop that spindle produces until it runs out.
AIBOARing frame → winding
Break detection is real, but its failure domain is a whole section and its decision is seconds away. Material keeps feeding the waste meanwhile.
AIRingPut your floor in
Six inputs, a payback range, and every assumption on screen next to the answer.
Run your own numbersSee it running
AIMMASS Technologies Private Limited is in Podanur, inside the Coimbatore spinning belt. Half a day is usually enough.
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