PillNot Tutorial

How pilling works — one factor at a time
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Build intuition in 60 seconds

Pilling is the result of many factors working together. The full simulator handles all of them at once. This tutorial strips the problem down to eight key factors and shows you how each one moves the pilling score on its own. Adjust a slider, watch the score change, and read the contribution bars on the right to see exactly what each factor is doing.

Factors

Polyester % 50%
More polyester → pills tend to persist longer once formed.
Viscose % 50%
More viscose → slight increase in fuzzing as cellulosic fibers shed more easily than tight synthetics.
Fiber total: 100%
Yarn twist level Medium
Tighter twist = surface fibers locked in = fewer fibers free to tangle.
Yarn hairiness Medium
Loose surface fibers are the raw material for pills.
Spinning process Ring
Open-end yarns have more loose surface fibers than ring or air-jet.
Fabric density Medium
Tighter fabric = less fiber movement = less pilling.
Weave pattern Plain
Long floats (satin) leave more surface exposed; plain locks fibers in.
Anti-pilling finish Off
A chemical finish that binds surface fibers — the binary intervention.
Softener finish Off
Counterintuitive: softener feels luxurious but raises pilling risk.

Predicted Pilling

Acceptable

A reasonable starting recipe (plain weave, ring-spun, balanced blend) sitting comfortably above the Class ≥3 target. Adjust a slider to see what moves the score.

Factor contributions

Red bars push pilling up (worse). Green bars push it down (better). Bar length shows how much.

Try this

Three pre-set experiments — see how the score and the bars react.

Factor reference — what each control does click to expand

Quick reference for the nine factors above. Direction indicates how the factor moves pilling when its value increases or the option is applied.

Factor When this goes up… Effect on pilling
Polyester % Higher polyester content in the blend ↑ pilling tends to persist longer once formed; polyester fibers are strong, so pills don't break off easily
Viscose % Higher viscose content in the blend ↑ pilling slight increase — cellulosic fibers shed more easily than tight synthetics
Yarn twist Tighter twist (low → medium → high) ↓ pilling surface fibers locked in, fewer fibers free to tangle
Yarn hairiness More loose surface fibers protruding from the yarn ↑ pilling loose surface fibers are the raw material from which pills form
Spinning process Open-end is worst → Ring → Air-jet is best ↓ pilling ring and air-jet produce cleaner yarn surfaces; open-end leaves more loose fibers
Fabric density Tighter construction (higher cover factor) ↓ pilling less room for fibers to move and tangle into pills
Weave pattern Longer floats (Plain → Twill → Satin) ↑ pilling long floats expose more surface; plain weave locks fibers in tightly
Anti-pilling finish Applied as a chemical treatment ↓ pilling binds surface fibers to the yarn core — the strongest single intervention
Softener finish Applied as a chemical treatment ↑ pilling counterintuitive: softener loosens surface fibers, which feels luxurious but increases pilling risk

Source: textile literature on the primary factors influencing pilling in woven fashion fabrics, summarized from the PillNot factor reference table.