# US 2013/0153331 A1 · Broadband sound absorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153331 A1 - Document ID: US20130153331A1 - Status: Published application - Kind: A1 - Application number: 13/818,521 - Filed: 2011-01-28 - Published: 2013-06-20 - Earliest claimed: 2010-08-25 - Assignees: HP Pelzer Holding GmbH - Inventors: Marco Schneider; Dirk Jaeger; Volker Kursch; Edmund Sumann; Norbert Nicolai; Volkmar Schulze - Web page: https://patentgrep.com/patent/US20130153331A1 ## CPC - E04B 1/8409: {sheet-shaped} - B60R 13/0815: {Acoustic or thermal insulation of passenger compartments (wall or roof liners integrating the insulating function B60R13/02; insulating floor mats or carpets B60N3/04)} - G10K 11/162: Selection of materials - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## Abstract The invention relates to a broadband sound absorber (1) which comprises a sound-absorbing filler material between two microperforated film webs (2) which are contiguous on their edges, said filler material optionally containing heavy fillers. The broadband sound absorber (1) achieving excellent acoustic insulation comprises a sound-absorbing filler material between two film webs (2) which are contiguous on their edges and have microperforations (4) all over or only in sections, said filler material optionally containing heavy fillers (mass density) and one or both microperforated film webs (2) having the same thickness across their surface or thickened portions (3, 5) of the same or a different material in some sections. ## Claims ### Claim 1 A broadband sound absorber (1) with a high acoustic insulation, comprising a sound-absorbing filler material, between two sheets (2) in complete circumferential contact having a complete or area-dependent microperforation (4), wherein one or both microperforated sheets (2) have the same thickness throughout their area or partial swellings (3, 5) consisting of a material which is the same as or different from that of the sheet (2); and optionally contains a heavy filler (mass component). ### Claim 2 (depends on 1) The absorber (1) according to claim 1, characterized in that said filler material comprises fibers selected from plastic fibers; plant fibers; animal fibers; inorganic fibers; foam flakes selected from polyurethane foam flakes, polyester foam flakes and/or polyolefin foam flakes; feathers; hollow bodies selected from polyolefin, glass; EPS, EPP, PEPP; wood shavings; wood flour in a loose form or shaped as a board, as individual materials and/or blends of two or more of the materials. ### Claim 3 (depends on 1) The absorber (1) according to claim 1, characterized in that said filler material has different compositions, different thicknesses, weights and/or densities over the area of the absorber. ### Claim 4 (depends on 1) The absorber (1) according to claim 1, characterized in that said heavy filler contains highly filled thermoplastic or thermoset plastic materials selected from PE, PP, EVA, and/or copolymers thereof as well as PUR and EP resins alone or in admixture, filled with mineral particles selected from chalk, baryte, sedimentary rock, silicates, and/or magnetite. ### Claim 5 (depends on 1) The absorber (1) according to claim 1, characterized in that the mass component of the filler material has different weights over the area. ### Claim 6 (depends on 1) The absorber (1) according to claim 1, characterized in that the mass per unit area of the sound-absorbing filler material is from 0.2 kg/m2 to 8 kg/m2, especially from 0.5 kg/m2 to 3 kg/m2. ### Claim 7 (depends on 1) The absorber (1) according to claim 1, characterized in that said sheets (2) include one or more plastic materials, one-ply or multiply plastic materials, metal, metalized plastic films, ceramics, and/or paper, especially two-ply plastic materials. ### Claim 8 (depends on 1) The absorber (1) according to claim 1, characterized in that the two sheets (2) are made of the same or different materials. ### Claim 9 (depends on 1) The absorber (1) according to claim 1, characterized in that the microperforations (4) of the sheets (2) have one or more diameters within a range of from 0.05 mm to 2.5 mm, especially within a range of from 0.1 mm to 1.8 mm. ### Claim 10 (depends on 1) The absorber (1) according to claim 1, characterized in that the perforation area of the sheets is from 0.1% to 15%, especially from 0.2% to 7%. ### Claim 11 (depends on 1) The absorber (1) according to claim 1, characterized in that said sheets (2) have the same microperforation as in the sheet or no microperforation in the region of swellings and/or mass components. ### Claim 12 (depends on 1) The absorber (1) according to claim 1, characterized in that said swellings (3, 5) and/or mass components (3, 5) have a perforation (4) with one or more diameters within a range of from more than 2.5 mm to 50 mm, especially from 5 mm to 20 mm. ### Claim 13 (depends on 1) The absorber (1) according to claim 1, characterized in that the perforation area in the region of the swellings (3, 5) and/or mass components (3, 5) is from 0.1 to 30%, especially from 0.2% to 10%. ### Claim 14 (depends on 1) The absorber (1) according to claim 1, characterized in that said complete circumferential bonding between the two sheets (2) is achieved by is achieved by welding, clamping, adhesive bonding, buttoning, sewing, stapling or riveting. ### Claim 15 (depends on 1) The absorber (1) according to claim 1, characterized in that the two sheets (2) are partially bonded together inside the peripheral zone by welding, adhesive bonding, clamping, buttoning, sewing, stapling or riveting.