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US 6,405,416 B1Granted
Method and device for producing perforated nonwovens by hydrodynamic needling
OwnerGerold Fleissnerinventor
Life of this patent
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Abstract
Method and device for producing perforated nonwovens by hydrodynamic needling. A nonwoven with a basically clean hole structure on a drum with plastic elevations can be produced by energy-rich water jets. Depending on the thickness of the fibers used in the nonwoven, however, certain fibers can nevertheless be stretched transversely across a hole. In order to avoid or eliminate this, the perforated nonwoven is subjected to singeing flames after drying.
Claims6
System for the continuous production of a nonwoven provided with holes, comprising:
- a water jet needling device to produce holes in a nonwoven by compressing the fibers into the lateral areas of the individual holes;
- a drying device for at least partially drying the nonwoven wet by the water jet needling device;
- and
- a singeing device extending over the working width of the nonwoven, the singeing device aiming open flames directly against the nonwoven.
1 more element
Dependencies are inferred from the claim text.