Wet finishing

No — a wool milling machine cannot replace a dryer. Milling is a wet mechanical process: the fabric is squeezed and worked in a liquor bath to bring about felting shrinkage, not to remove moisture. The fabric comes out of milling still wet and still needs a separate dewatering and drying stage before the next process. The two machines serve entirely different purposes. QL's WPF-1S milling machine and the combined WPF-4XS both cover only this milling stage — contact us and we can help match the drying equipment to your line.

A wool milling (fulling) machine is a wet-finishing machine that works woollen fabric in a liquor bath under repeated mechanical squeezing and friction, bringing about controlled felting. Wool fibres carry directional scales that ratchet the fibres toward their root under agitation, causing them to migrate and interlock; the fabric shrinks in both directions, becomes thicker and fuller, the weave is obscured and strength rises. Because this felting shrinkage is irreversible, the process has to be stopped precisely at the target degree. QL's milling machine, the WPF-1S, is this type of equipment, with squeeze settings matched to fabric weight and fibre blend.

Shrinkage in heavy milling is controlled by temperature, liquor ratio and the intensity of mechanical squeezing, not by any single setting. Warmer liquor and a liquor ratio below roughly 12:1 speed up milling, while the number and force of the squeeze cycles set how fast shrinkage builds. Because felting shrinkage is irreversible, the safest approach is to monitor progress against a target and stop right at that point rather than timing the cycle by feel. QL's wool milling machine, the WPF-1S, is built around this same logic — exact settings are confirmed against your fabric, so contact us with a sample.

Milling needs enough time under controlled wet, mechanical friction for the fibres to felt properly — processing speed is set by fabric weight, target shrinkage and machine design together, and running faster is not automatically better; push too hard and the felting comes out uneven. Actual throughput on QL's WPF-1S wool milling machine varies by material, so we won't quote a blanket figure here. Bring us your fabric and output target, and QL will work out the real speed for your process.

Yes — the two need different intensity. Smooth-face fabrics can take fuller mechanical action and heat to felt evenly for a dense, even handle; pile-face fabrics need gentler, shorter treatment, since heavy rubbing flattens or mats the pile. QL's WPF-1S wool milling machine works by moist heat plus mechanical rubbing, with the intensity set to match the fabric type.

Either arrangement works — the choice comes down to how mixed each batch is. When a batch routinely mixes different colours and weights that must run at the same time without cross-contamination, a combined scouring-and-milling machine with independently set channels suits better; when batches are uniform and run in steady volume, separate machines — a milling machine followed by a scouring machine — work just as well and let each stage run at its own pace. It is one path or the other, chosen by how the batches are structured, not both together. QL covers both routes: the four-channel WPF-4XS for one machine, or the WPF-1S wool milling machine with the WPF-XN scouring machine — tell us your batch mix and we'll help you choose.

No — not all of them. Worsted fabrics are prized for a clean, clearly defined weave, and mainstream worsted qualities skip milling altogether, since felting would obscure the weave and add bulk, working against what worsted finishing is going for. A few qualities are the exception — flannel-type worsteds that call for some fullness and cover still go through milling. Whether it is needed comes down to the specific quality and the handle the finished fabric is meant to have. For qualities that do need it, QL's WPF-1S wool milling machine and the combined WPF-4XS both handle it — tell us the quality and we'll confirm.

Wool's felting property is its fibres' tendency to felt and shrink on their own under wet mechanical action. The cause lies in the scales that cover the fibre surface, all pointing toward the tip; their ratchet-like grip drives the fibres preferentially toward the root under agitation and makes them interlock with one another — this is known as the differential frictional effect. Milling simply puts this natural property to controlled, deliberate use on the fabric. QL's milling machine, the WPF-1S, is built around this very property, adjusting squeeze intensity to the wool content of the fabric.

Consistent, repeatable milling from batch to batch comes down to fixing the same recipe of variables — temperature, liquor ratio and the number of squeeze cycles — rather than judging by eye. Warmer liquor and a ratio below roughly 12:1 both speed milling up, and fabrics differing in wool content, yarn twist or weave density need different run times to reach the same degree of shrinkage. Scouring-and-milling equipment with real-time shrinkage monitoring and automatic shut-off lets every batch stop at the same target point, cutting out operator-to-operator variation. QL's WPF-4XS offers exactly this as an optional speed-detection, single-channel auto-stop system, letting each channel target its own shrinkage level.

Wool milling (felting shrinkage) and ordinary shrinkage are not the same thing. Milling is felting brought on by fibres migrating and interlocking under wet mechanical action — the change is irreversible and makes the fabric thicker, fuller and less breathable. Ordinary shrinkage is mostly the fabric relaxing back from tension it picked up during spinning and weaving once it meets water or steam — essentially a dimensional recovery, not a change in fibre structure, and it does not usually alter handle or thickness nearly as much. QL's milling machine, the WPF-1S, handles this irreversible type — contact us to confirm settings for your fabric.

Milled (fulled) wool is woollen fabric that has been worked through the milling process until its fibres have felted and interlocked together. Wool's directional scales ratchet the fibres toward their root under wet mechanical action, so they migrate and lock into one another; the fabric ends up thicker and fuller, its weave obscured and its strength increased, and the change is irreversible. Most heavy woollen coating fabrics have been through this process. QL's milling machine, the WPF-1S, is built for exactly this step — contact us to check the fit for your fabric.

Yes, one and the same. Fulling and milling are simply the English names for a single wet-finishing process that goes by two different Chinese terms in the trade — wool fabric felting and shrinking under wet mechanical action until it grows thicker, fuller and stronger. Different terms, same process, not two different techniques. QL's milling machine, the WPF-1S, is exactly this machine — whichever name is used, the mechanism and result are the same.

Milling generally runs in three steps: wetting and lubricating the fabric so the fibres become workable, then repeated pressing and rubbing under controlled pressure and friction so the fibres felt and the fabric shrinks, and finally washing, dewatering and setting to stabilise the result. The sequence matters, and uneven control at any step leaves shrinkage inconsistent and handle uneven. QL's WPF-1S wool milling machine runs these three steps continuously — tell us your fabric and we'll walk through the process parameters.

Operating a wool milling machine covers pre-start checks, setting pressure and fabric speed to the material, monitoring shrinkage and temperature-humidity during the run, and cleaning and blanket maintenance at shutdown — the exact steps follow that machine's own structure. Watch points include not overloading the feed, clearing lint promptly, and preventing blanket drift. QL supplies the operating and maintenance procedure with every WPF-1S we deliver, plus on-site training — contact us for the full procedure.

A single-channel scouring-and-wool-milling machine is enough when batches are fairly uniform — colours and weights that do not change often, with no need to keep several different fabrics apart on the same machine. Once batches routinely mix different colours and weights that must run at the same time without cross-shading, a multi-channel machine, such as a four-channel scouring-and-milling machine with independently set channels, becomes the better fit. QL's WPF-1XS is exactly this single-channel machine, with the four-channel WPF-4XS available for mixed batches — contact us to confirm which suits you.

A scouring-and-wool-milling machine runs washing and milling in continuous sequence through one channel — operation covers setting each tank's temperature and line speed to the fabric, adjusting squeeze-roller pressure, in-process monitoring, and cleaning at shutdown, with exact steps following that machine's structure. QL supplies the operating and maintenance procedure with every WPF-1XS single-channel unit we deliver, plus on-site training — contact us for the full procedure.

Six pairs of crescent-shaped guide plates sit between each roller pair and interface precisely with the pressure plate and base edge, which is what prevents static-induced entanglement, tearing and perforation. This is how QL's WPF-4XS combined scouring-and-wool-milling machine is built — contact us if you would like more detail on the structure.

This risk comes from rope processing itself, not any one machine — rope scouring is known to clean better, but it can press creases into certain fabrics. QL's WPF-4XS combined machine adds an internal blower that keeps the rope moving and continually shifts where it folds, cutting that risk substantially. For fabrics that are especially crease-prone — mohair, silk, synthetic blends — the safer route is a two-stage set-up: mill in rope form as usual, then wash in open width on QL's WPF-JXPX, which runs the piece unrolled the whole time and avoids rope creasing at that step entirely.

During milling, the scales on the wool fibre surface, which all point toward the tip, grip like a ratchet under wet mechanical agitation and drive the fibres preferentially toward their root, so they migrate and lock into one another — the differential frictional effect. This migration happens in both the warp and weft directions at once, packing the structure tighter: weight per area rises, the fabric gets thicker, permeability drops, and the once-clear weave is covered over, which is why the fabric feels fuller and more substantial. Once this happens, it cannot be undone. QL's combined WPF-4XS is engineered around exactly this mechanism — contact us to confirm settings for your fabric.

A wool scouring machine's job is to wash greige fabric clean of the spinning oil, sizing agent, machine-oil stains and dust left on it, so the fabric reaches dyeing or the next finishing step clean and evenly treated. Skip this step and the residue left behind can throw off dye uptake and leave the handle uneven. QL's scouring machine, the WPF-XN, handles exactly this step — contact us to confirm a configuration for your fabric volume.

A rope scouring machine mainly removes spinning lubricant, warp sizing agent, machine-oil stains picked up during production, and dust and loose surface soil. The fabric, gathered into rope form, is worked and squeezed as it circulates through the liquor, and repeated soaking and squeezing carries the dissolved or emulsified soil away. QL's scouring machine, the WPF-XN, is this rope-form type and covers all of the above — contact us for a throughput-matched configuration.

The two clean fabric by different mechanisms. Bio-scouring uses enzymes to break down and loosen organic soil such as spinning oil and sizing under relatively mild conditions — a chemical and biological action. Mechanical rope scouring instead gathers the fabric into rope form and circulates it through the liquor, where spraying, squeezing and scouring auxiliaries do the work physically and mechanically. The two can be used together or on their own; which one fits depends on the fabric and the kind of soil involved. Tell QL your fabric type and soil, and we'll help you decide — our rope scouring machine is the WPF-XN.

Both points have a dedicated structural fix. High-pressure spray pipes at either side spread the fabric flat towards both selvedges, the spreader roller opens it out and the guide roller keeps it centred, so washed fabric comes out free of curled selvedges. The plaiting arm lays the fabric relaxed into an inclined storage chute; only the length leaving the chute for the nips is under tension, so the wet fabric is stretched less. Both features come standard on QL's open-width scourer, WPF-JXPX.

That is exactly one of its uses. Once milled and scutched, the fabric is washed free of soap liquor in open width, without being roped again, and then goes directly to crabbing with no scutching required. Each of the two nips presses out the liquor held within the fabric, and roller pressure is adjustable. This is how QL's WPF-JXPX open-width scourer is typically used straight after wool milling.

An open-width wool scouring machine sews the whole piece end to end into a loop and keeps it running in open width throughout the wash, never gathering it into rope form. Ahead of the squeeze rollers, high-pressure sprays hit both faces of the fabric to rinse off surface soil; on every circuit the fabric passes through two nips, each pressing out the liquor now carrying the dissolved oily soil. Cycle after cycle, this washes out spinning oil, sizing and soil while avoiding the creases that rope processing can leave behind. This is exactly how QL's open-width scouring machine, WPF-JXPX, is built to work.

Start by checking whether the liquor is hot enough — oily soil only emulsifies and releases cleanly once the liquor is above its melting point, and insufficient heat is the usual cause. An open-width washing machine heats the liquor directly with steam, circulates it by pump and controls the temperature automatically; combined with high-pressure spraying on both faces ahead of the rollers and two squeeze nips in series, it keeps pressing the emulsified oil out of the fabric cycle after cycle. Do not simply push the temperature higher than needed, though — excess heat risks faster felting, weaker strength and yellowing. If you're unsure what temperature suits your fabric, bring a sample and talk to QL about the WPF-JXPX open-width scourer.

A single bowl with two cylinders. Total wrapper length is constant — as one roll thickens the other thins, and both share one chamber allowance. The double-bowl machine's idle allowance, a full roll reserved in each bowl with one side always near-empty, is engineered away; liquor ratio and footprint fall together. QL's WPF-ZN crabbing machine bowl holds 1,500 litres.

No — the cooling bath is the final, required step of crabbing, not an optional add-on. The hot-water bath breaks and rearranges hydrogen bonds and disulphide cross-links in the wool; those new cross-links only lock in place as the fabric cools. Skip cooling and the fabric leaves the bath still hot and soft, and stacking it hot presses creases straight into the face. WPF-ZN's cooling trough fixes the set and brings the fabric down before it's plaited down.

Water marks and batch-to-batch colour mismatch usually trace back to uneven heating inside the crabbing bath — the inner and outer wraps see different temperatures and condensation, so dyeing later shows unevenly. Check how the roll changes position: fewer position changes means bigger gaps. WPF-ZN's single bath uses a twin-roller reciprocating wind, swapping the fabric between inner and outer positions every pass, so it gets a more consistent heating history end to end.

The distortion comes from weaving stress still locked inside the greige fabric — send it straight into rope-form washing or dyeing without setting it first, and that stress releases uncontrolled, causing distortion, cockling, and running marks (plain weaves are most prone). The fix is crabbing at the front of the wet-processing chain: it permanently sets the warp/weft relationship and width before rope-form treatment, so there's no stored stress left to cause creasing later. QL's crabbing machine, WPF-ZN, is built to be exactly that first setting step.

Crabbing's setting effect works through chemical bonds breaking and re-forming inside the fibre, not mechanical force. The hot-water bath breaks hydrogen bonds and disulphide cross-links in the wool, releasing internal stress; those cross-links re-form at new positions, and on cooling they lock in place with newly formed hydrogen bonds — a permanent set, unlike the cohesive (temporary) set that washes back out. The fibre needs to stay well saturated with water throughout for a deep set. QL's WPF-ZN crabbing machine is built around exactly this break-rearrange-cool process.

In plain terms, crabbing solves the problem that fabric can't survive wet processing without being set first. After weaving, wool fabric still carries internal stress; sent into washing or dyeing before that stress is fixed, it releases unpredictably — the fabric distorts, wrinkles, and picks up crease marks differently from batch to batch. Crabbing locks in a permanent set beforehand, fixing width and the warp/weft relationship, so the wet-finishing steps that follow run stable and the finished cloth comes out flatter. QL's crabbing machine WPF-ZN and continuous WPF-LXZH both exist to hold that line before the fabric moves on.

Each fixes something different, to a different degree. Crabbing gives fabric a true permanent set early in wet finishing, in a hot-water bath, locking width and length before rope processing. Decatizing sits at the end of dry finishing and resets handle, lustre and dimensional stability with steam, with depth tuned by the steam-exposure travel and an optional humidifying unit — for deeper setting QL offers the WPF-JXZN-MAX batch decatiser with its Ø2000 mm cylinder and the pressurised WPF-LXZN-P (0-3 bar). Polishing combs the pile straight and heat-presses it for shine, but that set is only temporary and needs decatizing afterward to hold. QL covers all three: crabbing with the WPF-ZN (or the continuous WPF-LXZH section), decatizing with the WPF-JXZN-MAX / WPF-LXZN / WPF-LXZN-P range, and polishing with the WPF-TG.

The difference is heating medium and where it sits in the line. Crabbing submerges the whole piece in a hot-water bath early in wet finishing — in Chinese practice, usually right after scouring/milling or after singeing — to give it a permanent set. Decatizing uses steam and sits as the very last step of dry finishing, just before final inspection, fixing handle and dimensional stability for good. Both work the same way chemically: moist heat breaks and re-forms hydrogen bonds and disulfide cross-links in wool fibre. QL builds both stations — crabbing machines (WPF-ZN) and decatizing machines (the WPF-LXZN series); tell us your width and output and we'll match the model.

Brushed fabric is cloth whose face has been mechanically brushed to lift fibre ends into a fine, even nap, giving a softer, fuzzier hand — flannel is a familiar example. Wet-brushed fabric specifically means that brushing happens while the fabric is still damp, common for wool: the nap lies flatter and more uniform than dry brushing, which tends to leave fibres standing loose, and it's usually followed by a setting step to lock that nap in place. QL's wet brushing and setting machine WPF-SSMDX handles the wet side and our vertical brushing machine WPF-SM the dry side, with an optional steam box for steaming before brushing — get in touch and we'll help you pick.

The core difference is whether moisture does the work. Dry setting relies purely on heat — hot air or dry contact softens the fibre enough to set a shape, common for heat-setting synthetics. Wet setting heats the fabric while damp or wet — crabbing is a textbook example — because water first breaks internal bonds like hydrogen bonds, letting fibres rearrange more freely before new bonds lock the shape on cooling. For the same durability, wet setting usually reaches a deeper result at a lower temperature than dry setting. QL's wet brushing and setting machine, WPF-SSMDX, runs on this wet-setting principle.

Each bath can be charged with its own liquor, to the quality and the process, and in each bath a rubber-covered top roller presses on a stainless-steel bottom roller, flattening the fabric softened in hot liquor bath by bath. The fabric stays in hot liquor in every crabbing bath. Five baths as standard, the number configured to order. This multi-bath layout is how the crabbing section of QL's WPF-LXZH continuous crabbing-and-drying line is built.

WPF-LXZH's footprint depends on the exact configuration, so there's no single number to quote. The drying tower itself is fixed — 5,384 mm tall, 1,950 mm wide, 2,200 mm deep (3,340–3,742 mm including the drive side), with a 3,020 mm entry gantry and a 1,214 mm transition unit. The crabbing section runs a standard 5 baths, but bath count — and so overall line length — is configured to throughput needs. Send QL your workshop's clear length and ceiling height to check fit; headroom for the drying tower is worth checking first.

Because hot wool is still plastic. After drying, the fabric passes the perforated-drum suction air-cooling system: suction inside the perforated drum draws cool air through the fabric, so it is cooled before plaiting and stacking creases are kept from being set into the face. This air-cooling stage comes standard on QL's continuous crabbing and drying line, WPF-LXZH.

The cold-water bath is so the new cross-links formed during crabbing can lock in place as the fabric cools — the necessary last step of setting, not an optional one; continuous crabbing lines in the industry run the same kind of quick cold-water quench after high-temperature treatment. There's a practical benefit too: cooling before plaiting means the fabric isn't stacked while still hot, avoiding creases pressed into the face. QL's continuous crabbing and drying line, WPF-LXZH, includes exactly this cold-water bath in its crabbing section.

The choice comes down to whether liquor dilution and a stable chemical concentration matter to you. Direct steam injection is simpler — no heat-exchange surface, no steam trap — but all the condensate ends up in the bath, diluting the liquor and raising its level; since crabbing baths run near boiling, direct injection can also cause a dull thump or vibration at times. Indirect heating uses an internal coil so steam never touches the liquor — better when a bath needs a stable dosed concentration. WPF-LXZH ships with direct heating as standard, indirect available as an option.

The double-dip means the fabric passes through the feed bath twice instead of once, so the liquor has time to soak in evenly rather than leaving spots under-impregnated before crabbing. The light squeeze rollers after the bath also send residual liquor back into the trough, so the extra pass improves absorption without wasting chemical. This double-dip design comes standard on QL's continuous crabbing and drying line, WPF-LXZH.

Usually yes. Overdrying takes wool below its normal moisture regain (roughly 14–16% at standard conditions), and downstream dry-finishing steps — raising, shearing, pressing, decatising — all need normal regain to work properly, so overdried fabric typically needs reconditioning first. WPF-LXZH's drying section lets you set temperature tier by tier to control drying strength, but there's no in-line moisture sensor, so checking after drying and reconditioning if needed is the safer approach.

Because squeezing water out mechanically is far cheaper than evaporating it with heat. The heavy-duty mangle presses out as much free water as possible before the fabric reaches drying, so the cylinders only need to evaporate what's left — taking load off the drying stage instead of burning heat energy on water that could simply be pressed out. QL's continuous crabbing and drying line, WPF-LXZH, fits exactly this kind of heavy-duty mangle ahead of its drying section.

Very few makers anywhere build natural-teasel raising machines; wire raising machines have more makers, mostly in Europe and China. QL is one of the teasel makers: the WPF-CG Teasel Raising Machine, developed in 2017 as China's first vertical teasel raising machine, raises wet right after wet brush-setting and forms a water-wave face on both sides in one pass, laying a smooth, fine nap. For wire raising and its longer, loftier pile, QL sources and configures a refurbished European machine with condition and origin confirmed, and the two can sit on one line, each for its own face. Tell QL your fabric and the face you want: WhatsApp +1 380 900 2442, or +86 189 2110 8080.

The general principle behind raising equipment is to use pins or teasel burrs to repeatedly hook and pull fibre ends up from the fabric surface, drawing them out into a raised pile layer. The term “napping machine” isn't always used the same way in different contexts — if you mean teasel raising specifically, QL's WPF-CG does exactly that with natural teasel burrs, which is gentler on the fibre. Send QL the machine you mean, and we'll confirm whether it's the same one.

Raising machines fall into two main types by the medium that does the raising, natural teasel heads or steel pins, and both can sit on one woollen finishing line, each for a different effect. Teasel raising comes in the wet-finishing stage after wet brush-setting and runs wet: the wool swells with water, the fibres curl naturally as they are stretched and released, and the pile lies smooth and fine, with a water-wave face available when wanted; the hooked tips bend rather than tear when they meet resistance, so the action is gentle. Wire raising comes in dry finishing, uses card-clothed rollers, works harder and pulls a longer, loftier pile. QL builds the WPF-CG teasel raising machine, China's first vertical teasel raising machine in 2017, forming a water-wave face on both sides in one pass; for wire raising, QL sources and configures a refurbished European machine with condition and origin confirmed. Tell QL your fabric and the face you want: WhatsApp +1 380 900 2442, or +86 189 2110 8080.

The choice comes down to whether the knitted greige already carries colour. Yarn-dyed greige — the yarn was dyed before knitting — is already finished-colour, so it skips dyeing and goes straight through untwisting, spreading, and squeezing to relax the fabric and remove knitting tension. Unbleached white greige still needs colour or whiteness added afterward, so it goes through piece dyeing or bleaching instead, with any untwisting/spreading step slotted in around that stage rather than replacing it. If you're unsure which route fits your greige, send us the fabric type and order details and we'll help work through the finishing route.

If the fibre isn't properly scoured, dye can't take up evenly or fully. Residual wool grease, spinning oils, and dirt sit on the fibre surface like a barrier, blocking or unevenly slowing dye penetration — showing up as patchy colour, specking, dull shade, or spots that resist dyeing altogether. The cleaner and more open the fibre surface, the more even and complete the dye uptake, giving steadier shade and better batch-to-batch colour matching. QL's WPF-4XS scouring-and-milling machine is built to solve exactly this scouring-quality step — tell us your process and we'll help configure it.

Raw wool fleece scouring removes wool grease (lanolin), suint, dirt and vegetable matter before spinning. It runs on a wool scouring train: fleece passes through several bowls of hot alkaline liquor (soap or nonionic detergent with soda ash), is squeezed between rollers, then rinsed and dried into scoured wool. Temperature, alkalinity and dwell time are set by the fleece's grease content — over-processing weakens fibre strength and lustre. This is a raw-material step before spinning, a different stage (and different machinery) from finishing-stage fabric washing such as milling or fulling after weaving. This step sits outside QL's own finishing-line range — contact us to confirm which post-weaving step your fabric needs.

A wool milling (fulling) mill processes woven or knitted wool fabric to felt and shrink it — moisture, heat, friction and pressure interlock the wool fibres' scales, making the cloth denser, thicker, warmer and softer while partially hiding the weave. Historically fulling was a separate trade from dyeing and finishing, often sited near water for the mechanical action; the name survives in old mill towns built around this step. In modern wool finishing, the same effect is produced inline by a milling/felting machine as part of the wet-finishing line, rather than a standalone mill. QL's WPF-4XS four-channel scouring-and-milling machine is built to run exactly this step.