Vibration damping system
AssigneeRockwool International A/S
InventorJohn Asmussen
Life of this patent
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Abstract
The vibration damping system, especially for use in the damping of vibrations e.g. from trains, tramcars, other traffic and damping of ground borne vibrations in general, comprises an anti-vibration plate in the form of a plate having a first and a second major surface. The anti-vibration plate comprises mineral fibers, a non-foamed polymeric material and/or a polymeric foam. The anti-vibration plate can further be provided with one or more hollow spaces, i.e. cavities. The anti-vibration plate is obtainable by a method comprising the step of subjecting an area of the opposite surface of the plate to a compression treatment in one or more steps, which compression treatment is sufficient to reduce the static and/or dynamic stiffness of the plate.
Claims20
A vibration damping system comprising an anti-vibration plate in the form of a plate having a first and a second major surface and comprising mineral fibres, a polymeric material having a Shore A hardness of between 35-98, and preferably an E-modulus varying between 2×105 and 69×108 Pa, more preferably between 7×105 and 35×108 and/or a polymeric foam having a density of 20-240 kg/m3, and preferably an E-modulus varying between 2×105 and 69×108 Pa, more preferably between 7×105 and 35×108, said anti-vibration plate being obtainable by a method comprising the step of subjecting an area of the opposite surfaces of the plate to a compression treatment in one or more steps, which compression treatment is sufficient to reduce the static and/or dynamic stiffness of the plate by at least 10%, preferably at least 15%, more preferably at least 20% compared to the static and/or dynamic stiffness prior to the compression treatment.
A vibration damping system comprising an anti-vibration plate in the form of a plate having a first and a second major surface and comprising mineral fibres, said anti-vibration plate further comprising one or more hollow spaces, said anti-vibration plate being obtainable by a method comprising the step of subjecting an area of the opposite surfaces of the plate to a compression treatment in one or more steps, which compression treatment is sufficient to reduce the static and/or dynamic stiffness of the plate by at least 10%, preferably at least 15%, more preferably at least 20% compared to the static and/or dynamic stiffness prior to the compression treatment.
A vibration damping system according to any one of the preceding claims, wherein the anti-vibration plate is in the form of a layer of mineral fibres having a density above 200 kg/m3.
A vibration damping system according to any one of the preceding claims, wherein the anti-vibration plate is in the form of a layer of polymeric material having a density of 400-1300 kg/m3, and preferably a thickness of 5-70 mm.
A vibration damping system according to any one of the preceding claims wherein the anti-vibration plate is covered on the first of its major side surfaces with a layer of surfactant-free geotextile, the surfactant-free geotextile preferably having a thickness of at least 0.1 mm, more preferably between 0.4 and 3 mm measured according to EN 964-1 under a load of 2 kN/m2.
A vibration damping system according to any one of the preceding claims wherein the anti-vibration plate is covered on one or more of its side surfaces with a surface coating in the form of a fibrous netting formed of a thermoplastic polymer material.
Dependencies are inferred from the claim text.