A jumper comes out of its third or fourth wash covered in small grey balls along the sleeves and across the back, and the usual conclusion is that the wash did it. Sometimes the wash helped. Mostly the wash simply finished a process that wearing the thing had already started. The balls are not dirt and they are not damage in the ordinary sense. They are the fabric’s own fibre, pulled out of the yarn and rolled up by rubbing. Once you know how they form, the difference between a garment that will shed them and one that will carry them forever becomes obvious on the label.
Where the little balls come from
A yarn is a bundle of short fibres twisted together. The twist is the only thing holding them in place, and no twist is tight enough to grip every fibre along its whole length. Each fibre has two ends, and in a soft, lightly twisted yarn a great many of those ends sit near the surface with very little holding them down. Rubbing works them loose a fraction at a time until a short tail stands proud of the fabric.
That standing tail is the raw material. When the surface rubs against something else, a sleeve against a desk, a back against a chair, the loose ends roll rather than lie flat. Rolling twists several of them together into a knot, and the knot picks up more ends as it turns. Within a few hours of wear it is a visible ball anchored to the fabric by the handful of fibres still rooted in the yarn.
So pilling is not really a sign of poor cleaning or of a garment falling apart. It is a sign that the surface has been rubbed in the same places repeatedly. That is why the pattern is always so predictable. Cuffs, the inside of the upper arms, the seat of a cardigan, the band across the back where a bag strap sits. Those are the places where friction is concentrated.
Why some knits pill and others do not
Three things decide it, and all three are set before the garment is bought. The first is fibre length. Long staple wool has fewer ends per unit of yarn simply because each fibre covers more ground, so there is less to work loose. Short staple yarn is nearly all ends. The second is twist. A tightly spun yarn grips its fibres and holds them in place; a soft, lofty yarn that feels lovely in the shop has almost nothing gripping.
The third is what the wool is mixed with, and this is the one that decides whether pills stay or go. On pure wool, a ball that has formed will eventually be pulled off by its own weight, because wool fibres are not especially strong and the few anchoring it will break. On a wool and nylon or wool and polyester blend, the anchoring fibres are far stronger than the ball is heavy. Nothing breaks, so nothing falls off.
That is the awkward trade. Synthetic content is added to knitwear because it makes a garment harder wearing and holds its shape better, and both of those things are true. The same strength that stops a cuff going baggy also stops the surface shedding what it has rolled up. A hard wearing blend does not pill less than pure wool. It pills about the same and then keeps the evidence.
Friction inside the drum
A wash cycle is a controlled rubbing process. The drum lifts the load and drops it, water carries it against itself, and every one of those contacts is doing on a large scale what a desk edge does to a sleeve. Water makes it worse in one specific way, because wet wool swells and softens and its fibres slide against each other more easily than dry ones do. Loose ends work free more readily in a wet garment than in a dry one.
Load size matters more than temperature here. A drum with one jumper in it has nothing to cushion the movement, so the garment slaps against the metal repeatedly. A drum packed solid has no water movement, so the load grinds rather than flows. A drum loaded to about two thirds, with similar weights of fabric in it, lets everything move as a mass with water between the layers, and that is what keeps contact pressure low.
The other thing to control is what the knit is rubbing against. Denim seams, zips, buttons and hook fastenings all act as combs. Turning a jumper inside out puts the face of the fabric, the part you actually look at, on the inside of the bundle and gives it the sleeve lining to rub against instead. A mesh bag does the same job more thoroughly, because it stops the garment reaching anything else at all.
Taking pills off without opening the knit
The instinct is to pull them off with your fingers, and that is the one method worth avoiding. Each ball is still connected to the fabric by fibres that are rooted in the yarn. Pulling drags those out from below and takes a little of the yarn with them, which thins the fabric at exactly the point that was already worn and leaves more loose ends behind than you started with.
Cutting is better. A battery fabric shaver holds the surface away from a rotating blade and cuts the ball off at its base, leaving the rooted fibres in place. Keep the fabric flat and supported while you work, because a shaver dropped into a fold will cut through the knit itself rather than across it. Work in one direction over a small area at a time rather than sweeping back and forth.
A pilling comb or a light sweater stone works on the same principle without a motor, catching the balls and breaking them away rather than pulling. For a fine knit they are safer. In either case, do it before washing rather than after, so the loose material goes into the drum and out with the water instead of sitting on the surface waiting to be rolled up again.
Keeping a jumper out of the friction zone
Rest is the simplest thing that works. Fibres bent and rubbed all day recover some of their shape given a day hanging in air, and a garment that has recovered resists further abrasion better than one worn flat two days running. Two jumpers worn alternately last noticeably longer than one jumper worn twice as often, and the difference shows up first in the places that pill.
Think about what sits against the knit. A bag carried on the same shoulder every day will produce a polished, pilled band there within a season. Moving the strap, or wearing a coat over the top of the knit, puts a sacrificial layer between the wool and the strap. The same applies to a seat back and a car seat belt, both of which work on a garment for hours at a time.
Finally, wash less than instinct suggests. Wool sheds surface soil readily and holds far less of it than cotton does, so a jumper that has been aired properly is usually clean enough. Every cycle is another round of the rubbing that produces the problem, and a garment that goes into the drum half as often will show wool pilling at roughly half the rate.
Knitwear through a Tempe autumn
Tempe spends most of the year too warm for heavy knitwear, which means jumpers here tend to live in storage for long stretches and then come out all at once when the evenings finally turn. Fabric that has been folded under other folded fabric for months arrives with the surface already compressed, and compressed fibre ends stand up more readily once the garment is moving again.
Dry air is the other factor. Wool at low humidity carries less moisture inside the fibre, which makes it stiffer and slightly more brittle, and a brittle fibre end breaks rather than bending when it is rubbed. Broken ends are shorter and work free of the twist more easily. It is a small effect over a day and a noticeable one over a season of dry weather.
Static compounds it. Charge builds readily in dry conditions and makes loose ends stand away from the surface rather than lying along it, which is precisely the position from which they roll into balls. A jumper that has been washed and properly rinsed carries a little more moisture and behaves better for a while afterwards.
Room for a gentle cycle
Most of the damage happens because a knit is sharing a drum with denim, or because it is alone in a drum far too big for it. Our machines come in enough sizes to match the load to the wash, and the wool cycles run at low drum speeds with a long, slow rhythm rather than a short, violent one.
The machines at our self-service laundry on East Baseline Road let you put a small run of knitwear through on its own, with nothing hard in the drum to comb the surface, and there is bench space to turn everything inside out before it goes in and to check the cuffs afterwards.
Our machines and the store are cleaned daily.
Nou wash-dry-fold service covers the everyday laundry.
For general guidance, The American Cleaning Institute publishes a fabric care guide that is a useful cross-check.
The short version
Pills are the fabric’s own fibre, worked loose by rubbing and rolled into knots. Short staple, soft twist and a strong synthetic in the blend all make it worse, the last because it stops the balls ever falling away. Reduce friction rather than chasing the result. Turn knits inside out, match the load to the drum, alternate what you wear, and cut the pills off with a shaver rather than pulling them.
WaveMAX Tempe is at 222 E. Baseline Rd., easy to reach from Tempe and the surrounding area. If you have a load that will not fit at home, call us at 480-278-9685.