Patent ID: 6716014
Filing Date: 2004-04-06
Classification: D01D

Abstract:
A melt spinning apparatus for producing a multifilament yarn comprisingan extruder for heating a polymeric material and extruding the resulting melt through a spinneret nozzle to form a plurality of downwardly advancing filaments, a cooling tube disposed below the spinneret nozzle for receiving the advancing filaments and comprising an inlet, a cylindrical portion below the inlet, and an outlet, a gas permeable inlet cylinder positioned between the spinneret nozzle and the inlet of the cooling tube, a suction generating device connected adjacent the outlet of the cooling tube so as to generate an initial cooling air stream through the cooling tube in the direction of the advancing filaments and so as to cause the filaments to solidify within the cooling tube, an air supply device for generating an additional cooling air stream in the axial direction of the cooling tube, with the air supply device being positioned downstream of the inlet of the cooling tube so that the additional cooling air stream contacts the downwardly advancing filaments only shortly before or after solidification of the filaments within the cooling tube and so that the additional cooling air stream is withdrawn from the cooling tube by the suction generating device, guide means for gathering the advancing filaments to form an advancing multifilament yarn, a winder for winding the advancing multifilament yarn into a package, wherein the air supply device is connected to the cooling tube such that the initial cooling air stream and the additional cooling air stream flow together in the direction of the advancing filaments, and wherein the air supply device comprises at least one opening in the cooling tube between the inlet and the outlet, and an air stream generator connected to the at least one opening, and wherein air is caused to positively enter the cooling tube through the at least one opening by the air stream generator so as to form the additional cooling air stream.