IMPROVEMENT OF DYEING PROPERTIES AT PRODUCTION OF PET YARNS BY ADDITION OF PBT(3)

3 Performance of tests and presentation of results

Mixtures of PET with up to 30% PBT content were prepared using a POY process into filament yarns having a filament (dpf) of approximately 3dtex, 1dtex and 0,75dtex processed. In this case, the influence of the spinning speed, the PBT-content of the filament titer and in the speed range of 2800-4500 m / min was investigated. . The starting materials for the production of yarn two commercial polyester granules Fa KoSa and Hoechst were used: Type RT20 (PET) and Type 4 (PBT). Both polymers were before using overnight in a vacuum (10-1 mbar) at 170 ° C and 160 ° C, then mechanically mixed with each other in the relevant mixing ratio and then fed directly to the intake area of the extruder. Many years of experience with the processing of granular mixtures, compared to the same masterbatch Composition could be confirmed on several occasions that our spinning plant a sufficiently homogeneous distribution of the components is achieved in the bi-component fiber, so that one can dispense with the use of masterbatches.

The aim of this granulate mixtures stretched filament yarns with filament titers of 2 dtex, 0,8dtex and 0,6dtex produce at different spinning speeds, was reached at about a comparable overall throughput in that the nozzle hole number has been adjusted. That is, has been in the manufacture of decreasing filament - at approximately the same dimensions as the single filament was fine - the total number of filaments in the yarn of 24 to 64 or 95 increased. The influence of different spin orientation tensile strength / elongation at break), caused by the different Winding speed and mixture composition could be countered that the throughput only had to be changed slightly.

Writen by R.Gutmann ICF,Institut Fur Chemiefasern der Deutschen Institute Fur Textil-und Faserforschung Stuttgart