The Production of Textured Yarns by Methods other than the False-Twist Technique

Filament yarn production

“…1 The temperature of the yarn was raised above T g (but below T m ), and then allowed to cool. Various forms of twister were used to induce the initial deformation.…”

“…This is a form of bulked continuous filament (BCF) production, which spins and texturizes the filaments in one operation; it is used mostly to produce nylon and polypropylene yarns for floor coverings [1]. As the material enters the nozzle in a plastic condition, the strands are looped or otherwise disturbed before they impinge on the plug of filaments in the stuffer chamber.…”

“…Air-jet texturing is now being used in conjunction with false twist texturing to produce filament yarns with staple-like characteristics [1]. Modifications to the structure involve surface loop control and/or the production of free fiber ends in the surface to simulate staple fiber yarns.…”

“…Theoretically, phases (1) and (2) can be interchanged or be coincident, provided the deformation persists until the filaments are cooled below T g and the polymer becomes set. However, time is a factor in determining the degree of set achieved and, in high speed machinery, it is usual to apply heat as soon as possible in the process.…”