Rieter

Economy of raw material utilization

Index

Raw material costs make up more than half the yarn costs. It is unlikely that much can be done about this, since rising raw material prices are to be expected in future. Increasingly, therefore, spinners will be forced to improve exploitation of the raw material. Without doubt, one possibility lies in recovery of fibers from waste: after all, on average about 50% of blowroom and carding droppings consist of good fibers. Their recovery is not especially difficult and the saving in raw material costs is significant, as illustrated by the following very approximate, and not very exact calculation for a small spinning mill:

Quantity of raw material processed per year

10 000 t

Total waste from blowroom and carding room

800 t

Recoverable waste

360 t

Price of the raw material (net) per kg (US$)

1.32

Saving on raw material per year (US$)

475 000

An additional advantage of such recycling installations is that a somewhat higher  degree of cleaning can be used in the blowroom machines, since with recovery of waste fibers the level of their elimination in blowroom and  cards becomes relatively insignificant.

Fig. 77 – Material flow diagram for raw material and waste