Here we explain the yarn count system we use and how we calculate yields and charges.
Contact us if you have further questions or if you need more information.
Yield to yarn
We calculare the yield of yarn from a batch of raw fibre as :
(conditioned weight of finished yarn/greasy weight of the skirted fibre) x 100%
Yield to yarn can be 75 – 80% for batches with low variation of fineness and staple length
The main sources of fibre loss are :
- scouring : removal of grease and dirt (5 – 10%)
- combing : removal of short fibres and remaining vegetation (5 – 10%)
We use the metric system which quotes the length of yarn for a given weight, in this case metres per gram.
eg. 1 gram weight of a 9 Nm yarn single has a length of 9 metres.
The higher the number the lighter and finer the yarn !
Folded yarns of 2 or more singles twisted together are described as 2/9’s Nm, 3/9’s Nm and so on.
Example of Price Calculation
(refer to our charges list for rates)
20kg skirted huacaya fleece processed to tops :
20 x £31.50/kg = £630.00
Weight of tops ( with average scouring and combing losses) = 17kg
17kg tops processed to yarn on cones :
17 x £29.00/kg = £493.00
Total charge £1123.00
which is approximately equivalent to :
£56.00 / kg of skirted fleece
£70.00 / kg of finished yarn (@ 80% yield)