Device for producing perforated nonwovens by hydrodynamic needling
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United States of America Patent
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Dec 4, 2001
Grant Date -
N/A
app pub date -
Nov 16, 1999
filing date -
Nov 16, 1998
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Abstract
A device is known for producing perforated nonwovens by means of hydrodynamic needling, with the perforation consisting primarily of sharply delimited holes in nonwoven of any dimension. The device consists of a smooth drum that supports and transports the nonwoven, said drum being provided with drainage openings to carry away liquid sprayed at high pressure by a nozzle beam from many outlets and having plastic elevations projecting from the plane of the smooth surface for producing the perforations in the nonwoven. The perforated nonwoven that can be produced by this device does not possess uniform strength in all directions. This uniform strength can be achieved simply by distributing the elevations nonuniformly over the drum to produce holes in both dimensions.
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