Expected Waste Quantities by Machine and Material
topic
Typical waste percentages in industrialised countries: blowroom 3–6% (varying by staple length), card 2.8–5%, comber 12–19%, draw frame 0.6% per passage, roving frame 1%, ring spinning 1.5–3%. Synthetics generate significantly less waste: blowroom 0.5%, card 0.6%, ring spinning 2.2%. Total waste from blowroom and carding averages 6–8% primary waste, consisting of approximately 50% good fibres and 50% contaminants.
Role
These waste figures guide raw material cost calculations, blowroom/carding room optimisation, and recycling installation design. About 90% of good fibre elimination can be recovered as secondary raw material containing about 6% trash.
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