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.