Products of various chemical kinds used for discontinuous treatments of woven or knitted fabrics on overflow/jet to reduce fibre-to-fibre friction, but also friction between the fibre and any part of the machine to avoid or to reduce, however, the formation of creases / barriness that can often affect particularly sensitive items when the bath ratio is low.

They hinder the formation of creases that could produce an unavoidable permanent flaw, e.g. stripes that differ in colour to the original.