Soiling can be of two types, dry soiling (actual use) and wet soiling (during laundering operations where soil redeposition occurs). Soil is transported to the fabric and then deposited on to it by
- Air currents
- Electrostatic attraction
- Contact transfer from soiled surface to cleaner surface by pressure, abrasion, impingement.
The soil release effect may be imparted by a) topochemical reactions such as grafting, hydrolysis or oxidation, b) durable physical adsorption of surfactnats on fibre surface and c) coating with soil release polymers.