A PROCESS FOR THE PRODUCTION AND FOR THE WINDING OF POLYESTER MULTI-FILAMENT YARNS AS WELL AS THE POLYESTER MULTI-FILAMENT YARNS OBTAINABLE BY SAID METHOD AND A DEVICE FOR THE WINDING OF ONE OR MORE MULTI-FILAMENT YARNS

摘要

The present invention refers to a process for the production and for the winding of at least one polyester multi-filament yarn which consists of at least 90 weight %, in relation to the total weight of the polyester multi-filament yarn, of polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, to provide at least one yarn package with long-term stability during storage and which is insensitive against elevated temperatures during storage and transport wherein the wound package of said at least one polyester multi-filament yarn is heat-treated at a temperature in the range of 45 °C to 65 °C. In addition the present invention relates to said polyester multi-filament yarn obtainable by said process wherein its elongation at break is in the range of 60 to 145 % and its boil-off shrinkage is in the range of 0 to 10 %. Finally the present invention also claims a device (2) for the winding of one or more multi-filament yarns (26) comprising a casing (4) and a rotatable spindle on which a tube (30) may be fastened, so that the tube (30) is placed in said casing (4), wherein the interior of said casing (4) is heatable.