Patent ID: 6572798
Filing Date: 2003-06-03
Classification: D01D

Abstract:
A melt spinning apparatus for producing a multifilament yarn, comprisingan extruder for heating a polymeric melt and extruding the resulting melt through a spinneret having a plurality of nozzle bores so as to form a plurality of downwardly advancing filaments, a cooling tube mounted below the spinneret so that the downwardly advancing filaments pass therethrough, an air stream generator connected to the cooling tube for generating an air stream through the cooling tube in the direction of the advancing filaments, a gas permeable inlet cylinder positioned between the spinneret and the cooling tube and through which the filaments advance, and such that a substantially radially inflowing quantity of air passes into the inlet cylinder and forms said air stream which then passes through said cooling tube, said inlet cylinder being subdivided in the direction of the advancing yarn into a plurality of zones, with each zone having a different gas permeability so as to control the quantity of air entering the inlet cylinder and the cooling tube, and wherein the inlet cylinder comprises an upper zone adjacent the spinneret and a lower zone adjacent the cooling tube, and wherein the upper zone has a lower gas permeability than the lower zone.