ZONED SPINNERET AND NONWOVEN FABRICS
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United States of America Patent
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May 23, 2024
app pub date -
Nov 20, 2023
filing date -
Nov 23, 2022
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Abstract
A spinneret for melt-spinning polymeric fibers including a spinneret body defining a plurality of orifices extending through the spinneret body, wherein the plurality of orifices each comprise a capillary that open at a face of the spinneret body for polymer filament extrusion therefrom. The plurality of orifices include (i) a first group of orifices each having a first capillary having a first capillary length (L) and first capillary hydraulic diameter (DH) defining a first L/DH ratio; and (ii) a second group of orifices each having a second capillary having a second capillary length (L) and second capillary hydraulic diameter (DH) defining a second L/DH ratio, in which the first L/DH ratio is larger than the second L/DH ratio. The first group of orifices define at least one first zone at the face of the spinneret body, and the second group of orifices define at least one second zone at the face of the spinneret body.
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