Method of producing an improved vibration damping and sound abso

Details Method of producing an improved vibration damping and sound abso Method of producing an improved vibration damping and sound abso

1981-03-02

1982-08-31

Silverberg, Sam

Acoustics

Sound-modifying means

Mechanical vibration attenuator

181208, 181291, 181294, 181296, 427409, 4274071, E04B 182, C04B 4300

Patent

active

043467822

ABSTRACT:
A novel method of producing a vibration damping and sound absorbing coating on a rigid substrate is provided in which method a first coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.6 to 5.times.10.sup.8 dynes/cm.sup.2 is sprayed onto the substrate whereafter there is sprayed onto said first coating a second coating of a viscoelastic material having after gelling a modulus of elasticity of 5.times.10.sup.7 to 5.times.10.sup.9 dynes/cm.sup.2, the modulus of elasticity of said second outer coating being at least 10 times greater than that of said first coating.

REFERENCES:
patent: 3087573 (1963-04-01), Ross
patent: 3658635 (1972-04-01), Eustice
patent: 3833404 (1974-09-01), Sperling
Damping of Flexural Waves by a Constrained Viscoelastic Layer, vol. 31, No. 7, Jul. 1959, JOASA.

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