Method and apparatus for enhanced fiber bundle dispersion with a divergent fiber draw unit
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United States of America Patent
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Aug 21, 2012
Grant Date -
Sep 25, 2008
app pub date -
Mar 19, 2007
filing date -
Mar 19, 2007
priority date (Note) -
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Abstract
A method and associated apparatus for melt extruding a nonwoven web includes providing a plurality of fibers from an extrusion device. The fibers are conveyed through a diverging profile portion of a fiber drawing unit (FDU) that causes the fibers to spread and expand in the machine direction within the FDU. The fibers are then conveyed through a diverging diffusion chamber spaced from the outlet of the FDU to reduce the velocity of the fibers and further spread the fibers in the machine direction. The fibers may be subjected to an applied electrostatic charge in either the diffusion chamber or the FDU. From the outlet of the diffusion chamber, the fibers are laid onto a forming surface as a nonwoven web.
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