| US 7,467,498 B2 | ||
| Flexible sheet materials for tensioned structures, a method of making such materials, and tensioned false ceilings comprising such materials | ||
| Marc Fontaine, Haubourdin (France) | ||
| Assigned to Newmat, SA, Haubourdin (France) | ||
| Filed on Apr. 05, 2005, as Appl. No. 11/99,357. | ||
| Application 11/099357 is a division of application No. 09/979245, granted, now 7,059,089, previously published as PCT/FR00/00682, filed on Mar. 20, 2000. | ||
| Prior Publication US 2005/0188633 A1, Sep. 01, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. E04B 1/82 (2006.01) | ||
| U.S. Cl. 52—145 [52/144; 52/222] | 20 Claims |
| 1. A tensioned structure comprising:
a support structure; and
an acoustic absorbing sheet of flexible polymer material having a thickness of less than half a millimeter and tensioned relative
to the support structure;
the sheet of material including microprojections having a height of 100 μm or less;
wherein the sheet of material presents an acoustic absorption coefficient which is higher than that of the same material without
said microprojections;
wherein said material is provided with microperforations having openings smaller than four-tenths of a millimeter
wherein said microperforations are disposed between the microprojections;
wherein the microperforations are disposed at the nodes of a pattern;
wherein the microperforations are disposed at the nodes of a pattern identical to the pattern of the microprojections and
offset relative thereto;
wherein the density of microperforations lies in the range 2 to 60 per square centimeter;
wherein the sheet of material is selected from the group consisting of plastified polyvinyl chlorides, vinylidene chlorides,
copolymers of vinyl chloride and vinylidene chloride, and combinations thereof; and
wherein the area occupied by the microprojections lies in the range 0.5% to 10% of the area of said sheet.
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