Fibre Preparatory Machinery
category
Preparatory machinery opens, cleans, blends, cards, draws, and combs raw fibres into uniform slivers ready for spinning, representing the critical quality-determining stages before yarn formation. The preparatory machinery market is valued at $2.1 billion, dominated by Trützschler (blow room, carding), Rieter (blow room to drawing), Lakshmi Machine Works (carding, drawing), and NSC (combing). Blow room lines (bale opening, cleaning, blending, fine opening) process 500–1,500 kg/hour of cotton at nep generation <100 neps/g (AFIS measurement) and trash removal 70–85%. Modern carding machines (Trützschler TC 19i, Rieter C 80, production rate 60–100 kg/hour, cylinder speed 400–600 rpm, flat speed 200–300 mm/min) achieve web nep count <80/g and short fibre content reduction of 20–30% in delivered sliver. Drawing frames (RSB D 45, draft 6–8×, delivery speed 800–1,000 m/min, autoleveller ±0.5% CV correction) improve sliver CV% from 3.5–5.0% (undrawn) to <1.0% (autolevelled drawn sliver). Combing machines (E 86 Rieter, 400 nips/min, noil extraction 12–20%) remove fibres shorter than 12–16 mm producing combed sliver for fine count ring spinning (Ne 40–120).
Role
Preparatory machinery determines the fibre quality ceiling for all downstream spinning operations — with carding nep count, drawing sliver CV%, and combing noil percentage directly setting the maximum achievable yarn quality, uniformity, and defect levels regardless of spinning frame performance.