Damping foil consisting of several layers and a method for producing same
View Patent ↗A multi-layer damping foil having a perforated lower layer facing towards a part to be damped, with properties which are suitable for adhering the damping foil onto the part. A non-perforated upper layer, facing away from the part, does not have adherence properties. Advantageously there may be provided between the upper and lower layers a thin film-like intermediate layer of non-woven fabric, kraft paper, or the like, which may have openings.
1. A multi-layer damping foil comprising a perforated first layer to face a part to be damped, said first layer having properties suitable for adhering the damping foil onto the part, and a non-perforated second layer to face away from the part, wherein said second layer does not have such adherence properties.
2. The multi-layer damping foil according to claim 1 , wherein the first layer has, on a side to face the part, impressions which connect the perforations with one another.
3. The multi-layer damping foil according to claim 1 , further comprising a thin, film-like intermediate layer disposed between the first and second layers.
4. The multi-layer damping foil according to claim 3 , wherein the intermediate layer has openings which align with the perforations in the first layer.
5. The multi-layer damping foil according to claim 3 , wherein the intermediate layer is a non-woven fabric layer or kraft paper layer.
6. The multi-layer damping foil according to claim 3 , wherein the intermediate layer is provided on both sides with a glue layer, for connection with the first and second layers.
7. The multi-layer damping foil according to claim 1 , wherein the first layer has a void proportion of about 5 percent to about 30 percent.
8. The multi-layer damping foil according to claim 1 , wherein the first layer contains magnetic or magnetizable particles.
9. The multi-layer damping foil according to claim 8 , wherein the particles are present in a proportion of about 50 weight percent to about 70 weight percent.
10. The multi-layer damping foil according to claim 1 , further comprising a dispersion glue layer or a hot-melt glue layer on a side facing the part.
11. The multi-layer damping foil according to claim 1 , further comprising a dispersion coating, an antiblocking coating or another surface covering layer on a side facing away from the part.
12. The multi-layer damping foil according to claim 1 , wherein at least one of the first and second layers comprises a bituminous material.
13. The multi-layer damping foil according to claim 1 , wherein the first layer has a thickness of about 0.3 mm to about 1.2 mm, and the second layer has a thickness of about 0.8 mm to about 2 mm.
14. The multi-layer damping foil according to claim 1 , wherein the damping foil is so dimensioned that a loss factor thereof is more than 0.1 at 0° C. to 40° C., and the mass per unit area is less than 5 kg/m 2 .
15. The multi-layer damping foil according to claim 1 , wherein at least a portion of the first layer has a layer structure of a strongly deficiently cross-linked polyurethane.
16. The multi-layer damping foil according to claim 15 , wherein the first layer is a bituminous mixture.
17. The multi-layer damping foil according to claim 16 , wherein the mixture has a melt viscosity at 180° C. of at least about 50000 mPa·s and a penetration value according to DIN 1995 between 15 and 55.
18. A method for producing a multi-layer damping foil comprising a perforated first layer to face a part to be damped, said first layer having properties suitable for adhering the damping foil onto the part, and a non-perforated second layer to face away from the part, wherein said second layer does not have such adherence properties, the method comprising the steps of:
producing a first layer,
perforating the first layer to form openings through the first layer, and
applying a further, second layer onto the first layer.
19. The method according to claim 18 , comprising applying, before or after the perforating step, a thin, flexible intermediate layer onto the first layer.
20. The method according to claim 18 , comprising embossing depressions into the first layer on a side thereof away from the second layer after the application thereof, such that these depressions connect the openings with one another.
21. The multi-lever damping foil according to claim 13 , further comprising a film-like intermediate layer disposed between the first and second layers, the intermediate layer having a thickness of about 0.1 mm.
22. The multi-lever damping foil according to claim 14 , wherein the mass per unit area is less than about 4.2 kg/m 2 .
23. The multi-layer damping foil according to claim 16 , wherein the first layer is a mixture of blown bitumen and atactic polypropylene.
24. The multi-layer damping foil according to claim 23 , wherein atactic polypropylene and blown bitumen are present in the mixture in a ratio of atactic polypropylene to bitumen of about 1:3.
25. The multi-layer damping foil according to claim 17 , wherein said penetration value is between 35 and 55.
26. The method according to claim 18 , comprising laminating the second layer onto the first layer.
27. The method according to claim 19 , comprising laminating the intermediate layer onto the first layer.