A process for producing a latent heat-bulkable polyethylene terephthalate yarn, the so produced yarn and its use in producing a bulked fabric.

摘要

A process for producing a latent heat-bulkable polyethylene terephthalate yarn comprising melt spinning a polyethylene terephthalate fiber-forming polymer into a plurality of filaments (10), cooling the melt-spun filaments in quench zone (14) below the second order transition temperature and taking up the filaments as a yarn at a speed in excess of 8000 feet per minute, characterised in that the cooled melt-spun filaments are divided into at least two groups and at least one of the groups is subjected to a heat treatment above the second order transition temperature, the filaments then being recombined.