. . "Examples of synthetic fibres are rayon, viscose staple fibre, viscose, cellulose diacetate and cellulose triacetate, polyacrylonitrile, acrylonitrile polymers, polyamide, in particular fibres made from poly-2-caprolactam, polyhexylmethylenediamide adipate or poly-aminoundecanoic acid and polyester, in particular fibres which are derived from terephthalic acid, for example poly(ethylene glycol tere" . . . .