Method for melt spinning filament yarns
First Claim
1. A method of melt spinning a group of multifilament yarns from a heated polymer melt comprising the steps ofextruding the melt through a plurality of nozzles arranged in a linear arrangement so as to define a plurality of linearly arranged downwardly advancing groups of filaments, and withdrawing the groups of filaments from the nozzles so that the groups of filaments advance a) through a precooling zone wherein the filaments are cooled without significant solidification, and then b) through an aftercooling zone wherein the filaments are further cooled by the action of a coolant flow which is directed into the path of the groups in such a manner that the filaments solidify in a solidification range within the aftercooling zone, with the coolant flow having a predetermined flow velocity for influencing the tension imparted to the filaments.
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Accused Products
Abstract
A method of melt spinning a group of multifilament yarns (1) from a polymer melt, wherein each group of yarns (10) is formed from a plurality of filaments (4) that are extruded through a nozzle bore (3) and withdrawn by a withdrawal means by the action of a withdrawal tension. In accordance with the invention, each group of yarns (10) is cooled in a precooling zone (5) and in an aftercooling zone (6) downstream thereof. The cooling in the precooling zone (5) and in the aftercooling zone (6) is adjusted such that the group of yarns (10) is cooled within the aftercooling zone (6) by the action of a coolant flow directed into the path of the yarn, so that the filaments (4) of the group of yarns (10) solidify in a solidification range within the aftercooling zone (6).
13 Citations
15 Claims
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1. A method of melt spinning a group of multifilament yarns from a heated polymer melt comprising the steps of
extruding the melt through a plurality of nozzles arranged in a linear arrangement so as to define a plurality of linearly arranged downwardly advancing groups of filaments, and withdrawing the groups of filaments from the nozzles so that the groups of filaments advance a) through a precooling zone wherein the filaments are cooled without significant solidification, and then b) through an aftercooling zone wherein the filaments are further cooled by the action of a coolant flow which is directed into the path of the groups in such a manner that the filaments solidify in a solidification range within the aftercooling zone, with the coolant flow having a predetermined flow velocity for influencing the tension imparted to the filaments.
Specification