Title:
【発明の名称】不織布防音ウェブおよびそれにより防音する方法
Document Type and Number:
Japanese Patent JP3014911
Kind Code:
B2
Abstract:
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 major 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 panel 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 50 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.
Inventors:
Delton Riesel Thompson
Joseph Albert Straw
Joseph Albert Straw
Application Number:
JP407594A
Publication Date:
February 28, 2000
Filing Date:
January 19, 1994
Export Citation:
Assignee:
Minnesota Mining and Manufacturing Company
International Classes:
B32B5/02; B60J5/00; B60J5/04; B32B5/08; B60R13/08; E04B1/82; G10K11/162; B60R11/00; B60R11/02; B60R13/02; (IPC1-7): G10K11/162; B32B5/02; B60R13/02; D04H3/16; E04B1/82
Domestic Patent References:
| JP5624118A | ||||
| JP6170059A | ||||
| JP6290361A | ||||
| JP4185752A | ||||
| JP4185754A | ||||
| JP4327258A | ||||
| JP61125821U |
Attorney, Agent or Firm:
Takashi Ishida (3 others)