Fixed nonwoven, at least partially of micro-fine continuous fusible polymer filaments, has longitudinally split melt spun filaments laid across the material width and bonded by water jets
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Abstract
Fixed nonwoven, at least partially of micro-fine continuous fusible polymer filaments, has longitudinally split melt spun filaments laid across the material width and bonded by water jets. To produce a fixed nonwoven, at least partially composed of micro-fine continuous filaments of a fusible polymer, the filaments are melt spun through a spinneret and are accelerated to a high speed e.g. through a Laval jet in a cold gas stream for drawing. Each filament has a hydrostatic inner pressure before it sets, which is greater than the ambient gas pressure, so that the filament splits longitudinally into a number of fine continuous filaments. The filaments are laid into a nonwoven of the required width, to be bonded by water jets which tangle them together in a hydrodynamic action. The fine filaments can be mixed with other fiber materials e.g. of wood pulp fibers, or laid over them.
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Cited Art Landscape
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