High speed spinning process using heated fluid environments for the manufacture of yarns

Abstract From the Canadian patent

Manufacture of polyester yarns by a high speed draw spinning process in which freshly extruded filaments are passed sequentially through fluid zones. The fluid zones comprise: a first one heated to a temperature above the melting point of the filaments and a second one heated to a temperature above the glass transition temperature of the filaments. These two zones are separated from one another. In the present invention yarns of comparable properties to conventional spin-lag-draw hot relax yarns are obtained, thereby substantially overcoming the deficiencies generally encountered in the prior art at these high speeds.