Method and apparatus for stretching thermoplastic synthetic fibres

摘要

Thermoplastic synthetic fibres which have been subjected to periodic and/or cyclical variation in temperature in a direction lengthwise and/-or crosswise with respect to the travelling direction of the fibres during stretching (see Division B5) may be cut or stretch-broken into staple length, mechanically crimped and spun into yarn which is heat-treated in the relaxed state to develop bulkiness.