In general, we distinguish between two kinds of yarn breaks:
·
Breakage during doffing
·
Breakage during the spinning process
Breakage during doffing
Cause of yarn breaks |
Remedy
(correction/solution)
|
· High curling tendency of the yarn |
·
Increase drafting system’s start-up
delay
|
·
Unthreading yarn
|
·
Change traveller type (e. g. form,
profile
·
Modify start-up program
|
·
Balloon stability too slowly built-up
|
·
Run-up faster or increase traveller
weight
|
·
Start-up characteristics
|
·
Optimise the starting program of the
ring spinning machine
|
·
Traveller jammed
|
·
Check condition of the ring, change
type of traveller
|
Breaks during spinning process
Cause of yarn break |
Remedy
(correction/solution)
|
·
Unsuitable traveller type
|
·
Try another traveller form, change
traveller profile, e. g. from f to dr profile
|
·
Uneven spinning tension, yarn tension
peaks
|
·
Poor centring of the rings, re
centre!
|
·
Spindle speed too high, yarn strength
insufficient
|
·
Yarn twist too low, increase the
twist or reduce the speed
|
·
Too long running time of the
travellers
|
·
Shorten the changing cycle
|
·
Poor condition of the rings
|
·
Replace rings
|
·
Climatic conditions not optimal
(fibre fly)
|
·
Optimise climate, adjust blower
nozzles
|
·
Yarn evenness (roving, impurities)
|
·
Optimise spinning preparation
|
·
Unfavorable raw material
|
·
Check raw material composition
|
·
Ring traveller severely worn
|
Reduce running time, test another traveller form
|
Yarn breaks are caused through many other factors like:
·
Preparation (Carding, Roving)
·
Conditions of the drafting unit (cots,
aprons, settings)
·
Centering of yarn guiding parts (snarl
wire, balloon control rings, spindles, rings)
