Method and device for bonding a non-woven fibre produced by the air-lay method
OwnerGerold Fleissnerinventor
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Abstract
The conventional method for production of a multiple-layer, non-woven fibre is by means of the air-lay method, with thermal bonding using bonding fibres. The same method can be applied to a composite non-woven fibre with an intermediate pulp layer. This method of bonding does not reduce the later pilling wear and hardly influences the inner composition of the layers of the composite. According to the invention, the outer non-woven fibre is preferably made from a bicomponent fibre and treated by hydrodynamic needling for bonding, such that not just the surface is bonded, but also the layers are bonded to each other.
Claims13
Method for strengthening a non-woven fabric, which has been produced according to the air-lay method, comprising two outer layers made of cut, thermally activatable fibres and one layer made of cellulose fibres, such as super-absorbent pulp, which is disposed between these outer layers, through continuous forming of initially the lower layer, then overlaying with the pulp layer and finally the top layer, characterised in that the two outer layers of the composite non-woven fabric are formed from fibres, which are from 8 to 10 mm maximum in length, and the three-layered non-woven fabric is subjected to a hydrodynamic needling process for the strengthening, that is to say also for the intimate bonding of the layers, which are laid solely according to the air-lay method.
Multi-layered composite non-woven fabric comprising two outer layers, which are formed in accordance with the air-lay method from fusion adhesive fibres, which are from 8 to 10 mm maximum in length, such as more especially double component fibres or and other fibres, such as high polymer fibres, between which layers is laid a further layer made of super-absorbent pulp, which is also produced according to the air-lay method, wherein this composite non-woven fabric, which is formed solely according to the air-lay method, is strengthened by means of the hydrodynamic needling.
Dependencies are inferred from the claim text.