Method and apparatus for melt spinning a multifilament yarn
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Aug 28, 2000
filing date -
Aug 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for melt spinning a multifilament yarn from a thermoplastic material, wherein a spinneret extrudes the thermoplastic material to strandlike filaments, which are initially in liquid form and then cooled to cause their solidification. For purposes of cooling, the filaments are precooled in a cooling zone downstream of the spinneret in such a manner that the filaments do not solidify. Subsequently, the filament bundle advances by the action of a coolant stream directed in the direction of the advancing yarn into a tension zone and undergoes further cooling until the filaments solidify in a solidification zone within the tension zone. To maintain the location of the solidification zone within the tension zone in a predetermined desired range thereof, an adjustable cooling of the filaments within the cooling zone is provided.
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