Four-Channel Wool Scouring and Milling Machine (WPF-4XS)

Where this machine sits in the line, and what comes before and after

WPF-4XS combines scouring and milling in one machine and is one choice at the washing-and-milling station. Milled worsted and woollen woven routes can use combined treatment, WPF-1S milling followed by WPF-XN rope scouring, or milling followed by opening and WPF-JXPX open-width washing. Most clean-face worsteds take the scouring-only branch.

The wool-blend knit route enters wet processing in tubular form and chooses combined or separate milling and scouring; the woven mill-then-open-width-wash branch does not apply. Woollen piece-dyed fabric and undyed knitted fabric are dyed after washing and milling, then opened or slit according to their routes before crabbing and later stations.

What it changes in the fabric, top or yarn: handle, dimensional stability, cleanliness

Scouring removes what is left on greige fabric — spinning lubricants, sizing agents, oil stains — so the fabric is clean enough for the next stage. Wool milling works through the differential frictional effect: fibre scales point toward the tip and ratchet together, so agitation drives fibres toward the root, shrinking the fabric in both warp and weft; the face thickens, the handle becomes fuller, the weave is covered — what the trade calls high cover — air permeability drops, and strength rises. This felting shrinkage cannot be reversed; subsequent pre-shrinking and decatizing still perform residual-shrinkage release and setting.

Why this machine is necessary: what happens without it, or with another method

Under-milled fabric leaves the face under-covered, the handle thin, short of the weight an order calls for. Over-milling cannot be undone — the fabric is scrapped, and can also yellow or over-shrink — so the stopping point must be judged precisely. Running scouring and milling as separate single-channel machines means batches queue for a full change of water and auxiliaries — output slows, and sharing a bath risks cross-shading, which is exactly what the WPF-4XS's four independently set channels solve. Rope-form processing, handled poorly, can press creases into the fabric — a known risk across the industry; the internal high-efficiency blower keeps continuous airflow, repositioning the crease points to control that risk at the source.

Setting the parameters: temperature, speed, fabric slot

The rubber-roller WPF-4XS-R runs 0–400 m/min with a 40–180 mm slot; the solid-wood WPF-4XS-W runs 0–250 m/min with a 40–220 mm slot. Bath temperature, liquor ratio, and squeeze frequency depend on wool content, fibre fineness, yarn twist, and weave density — there is no fixed value, set by sample trial, with a process sheet available from QL on request. A touchscreen handles process switching, settings, and diagnostics; an optional speed-detection auto-stop lets each channel carry its own milling target, stopping once reached while the others continue.

The questions customers ask most

• Different colours and weights have to run in separate batches — how do I stop that slowing my output?
• Can heavy woollens and light worsteds run on the same machine?
• Do scouring and milling really need separate machines, or is one enough?
• Can the fabric be torn or damaged in the machine?
• Can rope-form scouring and milling press permanent creases into the fabric?
• What actually happens to the fabric during wool milling — why does the face become thicker and fuller?

Which process routes it appears on

Read WPF-4XS in the context of these routes: worsted top-dyed, worsted piece-dyed, woollen stock-dyed, woollen piece-dyed, wool-blend knitted fabric. Follow each branch to understand the equipment choice; a required process does not mean every quality uses the same model. Most clean-face worsteds bypass milling; milled worsteds, woollens and the pile-knit route select separate or combined equipment for the milling task.

Give QL the fabric or top sample, existing upstream and downstream stations, and target finish to review configuration and process connections together.