Method and device for production of composite non-woven fiber fabrics by means of hydrodynamic needling

1. Method for producing a composite non-woven fabric for the production of a hygiene product comprising;

forming a spun-bonded non-woven fabric;

compressing the spun-bonded non-woven fabric in the dry state in a continuous process after forming the spun-bonded non-woven fabric for pre-strengthening;

coating the pre-strengthened spun-bonded non-woven fabric with a layer of pulp fibers;

conducting a hydrodynamic water needling process to interconnect and strengthen the layer of pulp fibers and the pre-strengthened spun-bonded non-woven fabric to form a composite non-woven fabric; and

then drying the composite non-woven fabric,

wherein the step of compressing the spun-bonded non-woven fabric provides only a light bonding of fibers of the spun-bonded non-woven fabric such that the pulp fibers enter into an internal bonding with fibers of the spun-bonded non-woven fabric in the hydrodynamic water needling process.

2. Method according to claim 1 , characterised in that the step of compressing the spun-bonded non-woven fabric is performed with compressed air.

3. Method according to claim 1 characterised in that the step of compressing the spun-bonded non-woven fabric is performed by calendaring.

4. Method according to claim 1 , further comprising applying a covering layer to the layer of pulp fibers before the step of conducting a hydrodynamic water needling process.

5. Method according to claim 4 , characterised in that the covering layer is a pre-strengthened and calendered spun-bonded non-woven fabric.

6. Method according to claim 4 , cheracterised in that the covering layer is a pre-strengthened and calendered card non-woven fabric.

7. Method according to claim 1 , further comprising calendering the dried composite non-woven fabric.

8. A composite non-woven fabric produced by the method of claim 1 .