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PROGETTAZIONE COSTRUZIONE E MANUTENZIONE
IMPIANTI PER INDUSTRIA TESSILE



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WHY a mule spinning system ? Let us go back of ages and remind of the hand-spinning technique based on the soft touch of a woman gently pulling a roving with her fingers. This is the basic operation of yarn spinning and it has been in use for centuries before, in England, Engineers designed and made the first mule-spinning machine. The principle however slightly changed since because the strong belief is still today that if you treat fibres gently you will get the best out of them in terms of softness and evenness. In the mule-spinning technique the slub-yarn is gently pulled off the card-bobbin and then drafted over a very long path to allow fibres to evenly distribute in parallel form and then receive the amount of twist as desired for the end-use of the yarn i.e. for knitting or weaving operations.


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The lenght of space along which it all happens gives the chance to keep the linear speed comparatively low and this will result in a great benefit, occasionally correcting any possible defect on the slub-yarn because the high revolving speed of the spindle will make the spindle tip to vibrate, bringing EXACTLY the same effect as it was from the finger-rubbing, and the amount of twist will first rush to fill any “weak-point” before the drafting action may cause a breakage there. Just perfect but, unfortunately in one way, the demand for ever faster equipment to meet the market’s requirements soon made textile industrialists to think over alternatives and when the technique of ring-spinning was introduced the fall of the mule-spinning concept started with the exception of those places and Mills where the tradition was to produce the highest possible quality of yarns. The mule-spinning system however continued to be developed in practically only one place in the world and this was and still is our area: PRATO, in Italy. Here, almost all of the woollen spinners have been operating on commission-basis and for this simple reason they believe in the mule-spinning concept because:

their range of yarn counts is not limited as it is, of course, if you have a given dimension of ring-diameter
the soft and gentle action of the mule-spinning gives a quality in no way comparable to that of a ring spinning operation where everything takes place over a lenght of 200-300 mm - which is the drafting zone - as opposite to the 3 or 4 meters of yarn-path of a mule