Dimensionally-recoverable damping article
AssigneeRaychem Corporation
InventorsDavid H. Krevor, Paul Martens
Life of this patent
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Abstract
Acoustic damping is provided by a dimensionally-recoverable article, either in single layer or constrained-layer form. The single layer, or the damping layer of a constrained-layer article, comprises a mixture of a damping component (generally having a high tangent delta value) and a hold-out component (generally having a significant crystallinity).
Claims11
An article for acoustic damping of a substrate, comprising
- (i) a damping first layer comprising a material that
- (a) alone exhibits viscoelastic damping, having a tangent delta value of at least 0.2 at a temperature between -10.degree. C. and 300.degree. C. and at a frequency between 5 and 100,000 Hz;
- and
- (ii) a constraining layer that is laminated to a substantial portion of a major surface of said first layer and that comprises a material that is dimensionally-recoverable having a recovery of at least 10%;
- the first and second layers together having a tangent delta value of at least 0.1 at a temperature between -10.degree. C. and 300.degree. C. and at a frequency between 5 and 100,000 Hz;
- and being capable of exhibiting constrained layer damping when installed on the substrate.
A multi-layer damping device comprising at least two articles acoustically coupled together, each of said articles comprising:
- (i) a damping first layer comprising a material that
- (a) alone exhibits viscoelastic damping, having a tangent delta value of at least 0.2 at a temperature between -10.degree. C. and 300.degree. C. and at a frequency between 5 and 100,000 Hz;
- and
- (ii) a constraining layer that is laminated to a substantial portion of a major surface of said first layer and that comprises a material that is dimensionally-recoverable having a recovery of at least 10%;
- the first and second layers together having a tangent delta value of at least 0.1 at a temperature between -10.degree. C. and 300.degree. C. and at a frequency between 5 and 100,000 Hz;
- and being capable of exhibiting constrained layer damping when installed on the substrate.
A method of providing acoustic dampling of a substrate comprising the steps of:
- (i) positioning an article adjacent a surface of the substrate subject to acoustic vibration, said article comprising a layer of a material that
- (a) is heat-shrinkable, having a recovery of at least 10%;
- and
- (b) exhibits viscoelastic damping, having a tangent delta value greater than 0.5 at a temperature between -10.degree. C. and 300.degree. C., and at a frequency between 5 and 100,000 Hz;
- and
- (ii) heating said article to cause the article to shrink to achieve acoustic coupling with said surface.
A method of providing acoustic damping of a substrate comprising the steps of:
- (i) positioning an article adjacent a surface of the substrate subject to acoustic vibration, said article comprising a layer of a material that
- (a) is heat-shrinkable having a recovery of at least 10%;
- (b) exhibits viscoelastic damping, having a tangent delta value greater than 0.5 at a temperature between -10.degree. C. and 300.degree. C., and at a frequency between 5 and 100,000 Hz;
- and
- (c) comprises a blend of
- (I) an elastomeric material capable of exhibiting visco-elastic damping;
- and
- (II) a hold-out component that is polymeric and at least partially crystalline and being capable of holding the material in a stretch condition;
- wherein the material is present in an amount of at least 60% of a total weight of the material;
- and
- (ii) heating said article to cause the article to shrink to achieve acoustic coupling with said surface.
Dependencies are inferred from the claim text.