Patent ID: 6174474
Filing Date: 2001-01-16
Classification: D01D

Abstract:
A device for producing microfilament yarns from thermoplastic polymers with a maximum of 500 dtex total titer and with individual filament titers of a maximum 1 dtex and high titer uniformity, comprisinga spinneret with capillary holes in a ring-shaped arrangement and a hole density L/A of up to 40 holes/cm.sup.2 of effective outlet surface,an air-permeable active cooling unit for tempered air, which is centrally located at the distance S under the spinneret and fixed in place,an insertion device with integrated air supply devices for the cooling unit,at least one yarn guide element selected from the group consisting of yarn guides of guide panels,at least one preparation application device,a yarn monitor, which is optionally combined with a control of the insertion device, andat least one winding unit,wherein the filaments spun together out of the spinneret are conducted, individually or divided into more than one separate filament bundle, provided with preparation and wound,wherein the distance S is set as a function of the equation ##EQU7##whereinS=Distance between the spinneret and cooling unit in [mm]TEK=Titer of individual capillaries in dtexRL=Number of rows of holes located behind each other on the spinneret to maximally 35 mm, and wherein the effective cooling length Lk of the cooling unit is set as a function of the titer and the spinning speed.