Multi-layer acoustic and/or reinforcing nonwoven fabric
The present invention includes a multi-layer acoustic and/or reinforcing non-woven fabric.
1. A multi-layer needle-punched acoustic and/or reinforcing non-woven fabric comprising two outer cover non-woven fabrics, comprising:
a) a first cover non-woven fabric consisting of a PE adhesive non-woven fabric with a basis weight of 30 g/m 2 to 200 g/m 2 , and a second cover non-woven fabric consisting of a PP/PET non-woven fabric with a basis weight of 50 g/m 2 to 250 g/m 2 , or
b) said first cover non-woven fabric and said second cover non-woven fabric are a PP/PET cover non-woven fabric with a basis weight of 100 g/m 2 to 800 g/m 2 ;
each containing a layer sandwiched between the outer cover non-woven fabrics and consisting of a ground material with a basis weight of 250 g/m 2 to 700 g/m 2 of PE, PET, PP and/or multicomponent (BiCo) fibrous material;
characterized in that
said ground material contains from 5% by weight to 50% by weight, based on the ground material, of dust scraps of PET and multicomponent (BiCo) fibers, wherein the ground material having a grain size from 1 mm to 8 mm and containing the dust scraps having a grain size from 1 μm to 1 mm.
2. The multi-layer needle-punched acoustic and/or reinforcing non-woven fabric according to claim 1 , characterized in that a PE/PA/PE three-layer sheet with a total thickness of 40 μm to 150 μm is provided between the top, in the direction of needle punching, cover non-woven fabric and said ground material.
3. The multi-layer needle-punched acoustic/reinforcing non-woven fabric according to claim 1 , characterized in that a PE/PA/PE three-layer sheet with a total thickness of 40 μm to 150 μm is provided between the top, in the direction of needle punching, cover non-woven fabric plus the layer of ground material/dust, and the bottom cover non-woven fabric.
4. A process for producing a multi-layer acoustic and/or reinforcing non-woven fabric comprising
providing a) a first cover non-woven fabric consisting of a PE adhesive non-woven fabric with a basis weight of 30 g/m 2 to 200 g/m 2 , and a second cover non-woven fabric consisting of a PP/PET non-woven fabric with a basis weight of 50 g/m 2 to 250 g/m 2 , or
b) said first cover non-woven fabric and said second cover non-woven fabric are a PP and PET cover non-woven fabric with a basis weight of 100 g/m 2 to 800 g/m 2 ;
each containing a layer sandwiched between the outer cover non-woven fabrics and consisting of a ground material with a basis weight of 250 g/m 2 to 700 g/m 2 of PE, PET, PP, and/or multicomponent (BiCo) fibers material;
characterized in that
said ground material contains from 5% by weight to 50% by weight based on the ground material, of dust scraps of PET and multicomponent (BiCo) fibers; wherein
the ground material has a grain size within a range of from 1 mm to 8 mm and containing the dust scraps having a grain size of from 1 μm to 1 mm, and the ground material are scattered onto the first cover non-woven fabric, and subsequently the second cover non-woven fabric is fed on top, the total composite is compacted, and needle-punched.
5. The process according to claim 4 , characterized in that at least one PE/PA/PE three-layer sheet is additionally fed below the top cover non-woven fabric or above the bottom cover non-woven fabric, and said PE/PA/PE three-layer sheet is microperforated by the needle-punching of the total composite.