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Melt Spinning

Notes

*10/5/2012

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Notes

“Melt spinning is the preferred method of manufacture for polymeric fibers. The polymer is melted and pumped through a spinneret (die) with numerous holes (one to thousands). The molten fibers are cooled, solidified, and collected on a take-up wheel. Stretching of the fibers in both the molten and solid states provides for orientation of the polymer chains along the fiber axis. Polymers such as poly(ethylene terephthalate) and nylon 6,6 are melt spun in high volumes.” (Polymer Processing, Melt Spinning, 11/3/2011)

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In the production of synthetic yarns, fibers, or fleeces it is generally known that a plurality of fine strand-like filaments is first extruded from a polymer melt. For this, the polymer melt is pressed through fine capillary holes of a spinning device, preferably a spinneret, so that the polymer melt exits from the capillary holes in fine, strand-like filaments. After the extrusion of the filaments it is necessary to cool them to solidify the polymer melt. For this, the filaments are guided through a cooling shaft where, at least from one inner side of the cooling shaft, cool air is blown, via a blower wall, into the cooling shaft. The blower wall, which, for example, can be formed by a wire mesh or several sieves, is disposed at a distance from the filament bundles so that the cool air exiting from the blower wall flows into the cooling shaft essentially in the direction transverse to the filaments and leads to the cooling of the filaments. [Harris et al, US Patent 8,178,015 (5/15/2012)]

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 5/24/2012.