Sound absorptive protective mat
The present invention concerns an automotive protective mat ( 1 ), also known as throw in mat or protective mat. This mat comprises a microporous stiffening layer ( 2 ) (acoustical membrane). This layer may be composed of several sheets. The overall air flow resistance is between 500 Ns/m 3 –4000 Ns/m 3 . It is essential for this mat ( 1 ) that it is hydrophobic. In order to achieve an enhanced acoustical effectiveness a decoupling layer ( 6 ) is foreseen between the microporous stiffening layer ( 2 ) and the vehicle floor ( 8 ). This decoupling layer might be incorporated in the mat ( 1 ) or constituted by the underlaying carpet or sound absorber of the vehicle floor. Further layers or sheets such as adhesive layers, non skid layers, face fabrics or carpets and/or loft layers can be added to the claimed mat.
1. Sound absorptive protective mat for use with a conventional motor vehicle flooring, in particular a multilayered assembly package comprising
a microporous stiffening layer, which protective mat comprises
a hydrophobic and air flow resistant layer having a total air flow resistance of 500 Ns/m 3 to 4000 Ns/m 3 ,
whereby, in the assembled state of the protective mat, with a motor vehicle flooring interacting means functioning as a decoupler, an air gap is generated between the protective mat and the motor vehicle flooring.
2. Sound absorptive protective mat according to claim 1 wherein the air flow resistant layer is a microporous layer with a bending stiffness of B=0.05 Nm to B=10.5 Nm.
3. Sound absorptive protective mat according to claim 1 , wherein the protective mat comprises a decoupler as interacting means.
4. Sound absorptive protective mat according to claim 2 , further comprising a loft layer selected from the group consisting of a diecut needled felt, a diecut thermoplastic felt, a diecut non-hexa resinated felt, a molded thermoplastic felt, a cast foam, and a diecut slab foam.
5. Sound absorptive protective mat according to claim 4 , wherein the layers are bonded to each other by an air permeable adhesive layer.
6. Sound absorptive protective mat in combination with a conventional motor vehicle flooring, in particular a multilayered assembly package comprising
a microporous stiffening layer, which protective mat comprises
a hydrophobic and air flow resistant layer having a total air flow resistance of 500 Ns/m 3 to 4000 Ns/m 3 ,
whereby interacting means functioning as a decoupler generating an air gap are provided between the protective mat and the flooring.
7. Sound absorptive protective mat according to claim 6 wherein the air flow resistant layer is a microporous layer with a bending stiffness of B=0.05 Nm to B=10.5 Nm.
8. Sound absorptive protective mat according to claim 7 , further comprising a face fabric or carpet.
9. Sound absorptive protective mat according to claim 7 , further comprising a loft layer selected from the group consisting of a diecut needled felt, a diecut thermoplastic felt, a diecut non-hexa resinated felt, a molded thermoplastic felt, a cast foam, and a diecut slab foam.
10. Sound absorptive protective mat according to claim 9 , wherein the layers are bonded to each other by an air permeable adhesive layer.
11. Sound absorptive protective mat according to claim 3 , wherein the layers are bonded to each other by an air permeable adhesive layer.
12. Sound absorptive protective mat according to claim 2 , wherein the layers are bonded to each other by an air permeable adhesive layer.
13. Sound absorptive protective mat according to claim 1 , wherein the layers are bonded to each other by an air permeable adhesive layer.
14. Sound absorptive protective mat according to claim 8 , wherein the layers are bonded to each other by an air permeable adhesive layer.
15. Sound absorptive protective mat according to claim 7 , wherein the layers are bonded to each other by an air permeable adhesive layer.
16. Sound absorptive protective mat according to claim 6 , wherein the layers are bonded to each other by an air permeable adhesive layer.
17. Sound absorptive protective mat according to claim 1 , wherein the hydrophobic and air flow resistant layer has a total air flow resistance of between 500 Ns/m 3 to 2000 Ns/m 3 .
18. Sound absorptive protective mat according to claim 6 , wherein the hydrophobic and air flow resistant layer has a total air flow resistance of between 500 Ns/m 3 to 2000 Ns/m 3 .