G - Physics – 10 – K
Patent
G - Physics
10
K
G10K 11/162 (2006.01) B32B 5/02 (2006.01) B60J 5/00 (2006.01) B60R 13/08 (2006.01) E04B 1/84 (2006.01) B60R 11/00 (2006.01) B60R 11/02 (2006.01)
Patent
CA 2112622
A method for attenuating sound waves passing from a source area to a receiving area comprises the steps of providing a nonwoven acoustical insulation web comprising thermoplastic fibers, the web having an average effective fiber diameter of less than about 15 microns, a thickness of at least about 0.5 cm, a density of less than about 50 kg/m3, and an air pressure drop across the web of at least about 1 mm water at a flow rate of about 32 liters/min.; and positioning the web between the source area and the receiving area such that a mayor face of the web intercepts and thereby attenuates sound waves passing from the source area to the receiving area. Also, a laminate which is applied to the inner penal of a vehicle door comprises the above web and a second layer, such as a scrim, nonwoven fabric, film, or foil, laminated thereto. The laminate can be applied to the inner panel of a vehicle door so that the second layer provides water barrier protection and the web provides acoustical insulation. Also, a nonwoven acoustical insulation web comprising thermoplastic fibers, the web having an average effective fiber diameter of less than about 15 microns, a thickness of at least about 0.5 cm, a density of less than about 20 kg/m3, and a pressure drop of at least about 1 mm water at a flow rate of about 32 liters/min. The web typically comprises melt-blown microfibers and crimped bulking fibers.
Stroh Joseph A.
Thompson Delton R.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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