Patent ID: 9689097
Date: 2017-06-27
CPC Classifications: D04H,Y10T

Claim:
1. A rigid nonwoven composite acoustical fabric panel product formed from a web of an essentially uniform needled blend of: mineral fiber having a diameter of between about 13 microns and about 17 microns; bi-component polymeric fiber comprising a first polyester core having a first melting point and a copolymeric polyester sheath having a second melting point lower than the first melting point, the bi-component polymeric fiber having a denier range between about 2 denier and about 15 denier; the bi-component polymeric fiber comprising between about 50 wt percent and about 83 wt percent core, based on the weight of the bi-component polymeric fiber; the web having a thickness of between about 0.5 inch and about 36 inches and comprising between about 90 wt percent and about 30 wt percent bi-component polymeric fiber, based on the total weight of the mineral fiber and the bi-component polymeric fiber, the mineral fiber being essentially unbonded to the bi-component polymeric fiber; and wherein the panel product has a thickness not more than about 50 percent of the thickness of the web and between about 0.08 inch and about 1 inch, a specific density of between about 500 g/m