Abstract: A process for the production of a panel (9) with a fitted acoustically resistive layer, including at least one central core with porous structure bounded on one side by a structural layer covered with a porous acoustically resistive layer and, on the other side, by a total acoustical reflector, in which, successively, acoustically resistive strips are laid down to form the layer on a mold (M) shaped like the panel to be obtained, the structural layer is emplaced, the core of porous structure is emplaced, the total reflector is emplaced, then the mold (M) is withdrawn from the panel. When laying down on the mold (M) the acoustically resistive layer, the porosity of this latter is locally adapted to correspond with the characteristics of the sonic wave at the point of impact, the correlation between characteristics and impact region being previously determined by conventional acoustical techniques applied to a test panel identical to that to be produced.

Abstract: The present invention provides methods for constructing fibrous-glass-free acoustic absorbing panels.

Abstract: A heat-insulating an soundproofing lining for an engine compartment is disclosed, and a method of manufacturing the same, are disclosed. According to one embodiment of the present invention, the lining includes a first covering layer facing the engine. A duroplastic foam layer contacts the covering layer. A soundproofing layer contacts the duroplastic foam layer. A second covering layer contacts the soundproofing layer. According to another embodiment, a method of manufacturing a heat-insulating and soundproofing lining for an engine compartment is disclosed. The method includes the steps of (1) providing a first covering layer; (2) providing a duroplastic foam layer on the first covering layer; (3) providing a soundproofing layer on the first covering layer; (4) providing a second covering layer; and (5) pressing the layers together at an increased temperature and an increased pressure.

Abstract: Apparatus and methods are provided forming a sound attenuating laminate that has a decoupler fiber layer and a mass layer in opposing relationship with each other. The decoupler fiber layer and mass layer of the laminate are heated to the selected temperature in substantially the same amount of time via a hot air source and a heated platen, respectively. The heated laminate is conveyed to a mold and formed into a predetermined three-dimensional configuration via the mold.

Abstract: An acoustic blanket is disclosed for an industrial machine including a plurality of flexible panels, wherein each panel includes at least one layer of a fiber glass material, an outer casing of a chemically resistant material and an attachment for connecting the panel to an adjacent panel, and the plurality of flexible panels are each assigned a position in said blanket corresponding to a location on the industrial machine.

Abstract: Acoustical attenuating devices (52) and method of forming them. The attenuating devices (52) include an exterior layer (64), a sound absorption layer (66), and multiple perforated layers (68) coupled to the sound absorption layer (66). The perforated layers (68) include a perforated structural layer (70) and a perforated substrate layer (72). The perforated structural layer (70) and the perforated substrate layer (72) provide structural stiffness and define multiple resonating tubes (88) that attenuate sound.

Abstract: A loudspeaker enclosure is disclosed. The loudspeaker enclosure comprises a base panel, a first side panel configured to attach to the base panel, a second side panel configured to attach to the base panel, a top panel configured to attach to the first side panel and the second side panel, a front panel configured to attach to the base panel, the first side panel, the second side panel, and the top panel, the front panel defining at least one loudspeaker opening configured to receive a loudspeaker, and a rear panel configured to attach to the base panel, the first side panel, the second side panel, and the top panel.

Abstract: An acoustical absorber, having the structure: scrim/film/batt/film/scrim. Preferably, the batt is made from about 60% to about 90% by weight natural fiber and about 10% to about 40% synthetic fiber. Also, a method of making the acoustical absorber is provided. Additionally, a method for acoustically insulating a structure with the acoustical absorber is provided. The method for acoustically insulating may include the steps of compressing the acoustical absorber to less than its original volume prior to installing the absorber and releasing the absorber from compression following the installing step, allowing the material to recover and to fill the void of the structure in which the absorber was placed.

Abstract: An acoustic blanket is disclosed for an industrial machine including a plurality of flexible panels, wherein each panel includes at least one layer of a fiber glass material, an outer casing of a chemically resistant material and an attachment for connecting the panel to an adjacent panel, and the plurality of flexible panels are each assigned a position in said blanket corresponding to a location on the industrial machine.

Abstract: A sealing and acoustic insulation panel, in particular for automobile vehicle doors, includes a sealing sheet and a layer of acoustic insulation, with a bead of adhesive material on the sealing sheet for fixing the panel to a support plate. A frame for applying pressure to the bead of adhesive material is placed between the sealing and acoustic insulation panel and a trim panel clipped to the support plate.

Abstract: The invention relates to a component part, especially a rear parcel shelf, and to a method for the production thereof, whereby the component part is provided with a honeycomb-like core layer (2) which is provided with a reinforcing layer (3, 4) on each side. This layer comprises a nonwoven that contains thermoplastic fibers. The core layer (2) is made of thermoplastic material and is connected to the thermoplastic fibers of the reinforcing layer (3, 4) b material fit. The reinforcing layer (3, 4) is precompressed and air permeable and has an air flow resistance ranging from 500 Nsm−3<R<3500 Nsm−3.

Abstract: A sound absorbing material having a homogenous mixture of an organic man-made fiber, an inorganic man-made fiber, a co-binder, and a cellulose material wherein the organic man-made fiber is polyester, the inorganic man-made fiber is fiberglass, and the co-binder is a thermo-setting resin. The cellulose material may include Kaolin clay and/or boric acid.

Abstract: An acoustical wall panel for use for reduction of sound and noise, including a panel-like structure, formed of a base, generally fabricated of fiberglass, polystyrene, etc., having a covering sheet applied thereon, containing a large number of perforations, to allow noise to pass therethrough, to the sound of absorbing base, the covering sheet being folded over the corners and adhered to itself to provide complete coverage for the side and end edges of the formed panel. A back covering is provided of a foil, polyethylene, or other material, to function as a moisture barrier and protectant for the back of the panel.

Abstract: An air purifying and sound insulating wall and a highway air purifying and sound insulating wall having a formed surface that supports a photo-catalyst made of RB ceramics or CRB ceramics. This sound insulating wall absorbs sound due to its porosity and has simple structure which is fully effective in dealing with NOx and other noxious gases. It is light in weight, weather-resistant and corrosion-resistant. It can withstand the strong radicals which are produced by the action of oxides of titanium and other photocatalysts. The wall is also easy to manufacture and has superior adsorbent properties.

Abstract: An acoustical insulation laminate having a porous polyolefin layer and a process for making the laminate. The laminate preferably includes a porous multiple density polyolefin film, a sound absorbing material and may include a face cloth on one or both sides of the laminate. The porous polyolefin film is preferably disposed between a sound source and the sound absorbing material improving the total noise reduction coefficient of the sound absorbing material alone while reducing the weight of laminates having similar noise reduction capabilities.

Abstract: A vehicle floor structure having a noise insulation structure with a two-way freedom system is provided. The two-way freedom system noise insulation structure is comprised of a lower mass layer and a urethane layer beneath the same, and an upper mass layer and a low resilient material layer beneath the same and made of fibrous material layer or low resilient urethane layer.

Abstract: A multi-component acoustically resistive layer, for acoustical attenuating panels having a cellular core (1) flanked, on the sound wave arrival side, with an acoustically damping layer (2) and, on the opposite side, with a rear reflector (3), comprises a first structural component (4) in contact with the aerodynamic flow and formed by at least one layer of fibers connected by a suitable resin and oriented in the direction of aerodynamic flow the component (4) comprising a suitable quantity of open surface; a dissipating component (6) disposed against the surface of the first component (4) opposite the flow, formed by a metallic cloth; and a second structural component (7) formed by at least one layer of fibers connected by a suitable resin, oriented orthogonally to the direction of aerodynamic flow. The second structural component (7) is connected to the cellular core (1) and comprises a suitable open surface quantity.

Abstract: The present invention provides a sound barrier system 10 including a sound barrier panel 20 having a face skin panel 30 held in spaced relation from a back skin panel 40 by a filler material 50. Each sound barrier panel 20 is provided with a tongue and groove design that permits panels 20 to be stacked in an interlocking fashion without fastening hardware.

Abstract: A sound-insulating floor structure, which can conspicuously reduce heavy floor impact sounds, is provided. The sound-insulating floor structure includes a floor base and an underfloor member. A plurality of sound-insulating floor members are arranged between the floor base and the underfloor member, and each of the sound-insulating floor members includes a plurality of impact-absorbing members and a support member supporting the impact-absorbing members. The impact-absorbing members are provided at at least one of upper and lower faces of the support member. Each of the sound-insulating floor members is fixed to the floor base or to the underfloor member, thereby supporting the underfloor member.

Abstract: Sound attenuating composite articles and methods of making same are provided. Sound attenuating composite article include first, second and/or third and/or fourth layers of material. The first layer of material may be either an acoustic fiber batting and/or an acoustic foam material and may be an elastic or inelastic material. The second layer of material is a thermoplastic material that is fused to a surface of the first layer of material. The third layer of material is a thermoplastic material that is fused to a surface of the second layer of material. The fourth layer of material is a woven or non-woven mixture of fibers, such as scrim material, that is attached to a surface of the third layer of material. Selected portions of the sound attenuating composite article are heated and then compressed (referred to as “tuned”) so as to have an acoustic impedance that is greater than an acoustic impedance of adjacent portions.

Abstract: The composite sound insulation system for room boundary surfaces includes a sound-proofing layer (D) in communication with the corresponding floor, wall, or ceiling covering (V) which preferably has an inner loss factor &eegr;int of at least 0.1, and more particularly of at least 0.2, and a footfall sound-proofing layer (S) adjoining the floor, wall, or ceiling covering (V) or the sound-proofing layer (D) on the side facing away from the room and having a dynamic stiffness (s′) of at most 20 MN/imn3, preferably of at most 10 MN/m3. The floor, wall, or ceiling covering (V) preferably is a paneling having a thickness of at most 40 mm, preferably of at most 20 mm, and more particularly at most 10 mm, which can be made of two parts, in which case (V1, V2)for instance, at least one sound-proofing layer (D) is arranged between the two parts (V1, V2).

Abstract: In a sound-deadened wall comprising wooden studs, each of which has a front edge and a back edge, a front wall panel is fastened to the front edges of the studs and a back wall panel is fastened to the back edges of the studs. Further, front spacers are positioned along the front edge of each stud, between the front edge of said stud and the front wall panel, so as to define air gaps between the front edge of said stud and the front wall panel, and back spacers are positioned along the back edge of each stud, between the back edge of said stud and the back wall panel, so as to define air gaps between the back edge of said stud and the back wall panel. Each wall panel has two expansive surfaces and the associated spacers are defined by elastomeric strips adhering to such wall panel, on the expansive face to face the associated edges of the studs, before such wall panel is fastened to the associated edges of the studs.

Abstract: Sound attenuating composite articles for use within vehicles as floor coverings and other interior trim components are provided. A sound attenuating composite article includes a damping layer, decoupler layer, scrim/web layer, and a porous upholstery material sandwiched together. The damping layer has a thickness of less than about 5 mm and is configured to be attached to a surface of a panel of a vehicle (e.g., a sheet metal or polymeric component of a vehicle, such as a floor panel, door panel, etc.) in face-to-face contacting relationship therewith. The decoupler layer has a thickness of less than about 70 mm and is attached to a surface of the damping layer in face-to-face contacting relationship. The scrim/web layer has a thickness of less than or equal to about two millimeters (2 mm). The porous upholstery material (e.g., carpeting) is attached to a surface of the scrim/web layer of material in face-to-face contacting relationship therewith.

Abstract: An acoustic medium for temporary acoustic treatment of a room is formed from one or more continuous curtains, preferably, with pleated first and second major surfaces. Each pleated curtain preferably has one or more series of collapsible elongated tubular sections which form the pleats that make up the major surfaces of the curtain. Since the elongated tubular sections are collapsible, the curtain can be retracted by collapsing the elongated tubular sections and extended by opening the elongated tubular sections. The mat materials forming the elongated tubular sections and the pleated major surfaces of the curtain provide the curtain with an airflow resistance through the curtain, in a direction generally perpendicular to the planes containing the apexes of the pleats forming the first and second major surfaces of the curtain, that has the desired properties for absorbing or reflecting sound.

Abstract: A portion of a chassis comprised of a material forming a portion of the exterior of the chassis and a high-density flexible material adjacent an inner surface of the portion of the chassis with air holes formed contiguously through both the portion of the chassis and the high-density flexible material.

Abstract: The present invention provides a radio frequency (“RF”) shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging (“MRI”) equipment through the supports of such equipment. The RF enclosure uses multiple layers and types of insulating materials positioned to maximize the noise absorption of the RF enclosure. This reduces the cost and space required by the enclosure. In one embodiment the enclosure includes a ceiling, a floor and a plurality of walls. The ceiling and walls include one or more multiple layers of different indulating materials that either abut each other or form air gaps. In one embodiment the floor includes a heavy metal plate on which the MRI equipment sits. The plate elastically couples to a conductive shield. The elastic coupling attenuates certain frequencies above the natural frequency of the metal sheet.

Abstract: An acoustically absorbent porous panel with a layer constructed from a substantially continuous open-celled porous material comprising a cured foamed cementitious material including a first face and a second face. The first face has a surface with a substantially planar profile and the second face has a substantially geometric pattern of depressions formed therein comprising approximately 50% to approximately 90% of the layer by volume.

Abstract: A new system for soundproofing floors utilizes a laminate material having a thickness that is 50% less than conventional asphalt soundproofing material but which has better sound reducing properties than the asphalt soundproofing material. The new system does not require the use of solvents inherent in conventional soundproofing systems, and, accordingly, results in significant reductions in the cost of labor incurred to install the system. The new system utilizes a laminate consisting of uncured rubber, particular embedded in the uncured rubber, and a fabric mesh.

Abstract: An acoustical panel has a fiberboard which includes a fibrous filler and a base binder, and a nodulated overlay disposed on the fiberboard, wherein the overlay includes nodulated wool and an overlay binder and has a substantially smooth surface. In one embodiment of the present invention, the fibrous filler is mineral wool and the base binder is granular starch. In an another embodiment of the present invention, the nodulated wool is nodulated mineral wool and the overlay binder is cooked pearl cornstarch. A method of making the durable acoustical panel in accordance with the present invention is disclosed. Initially, an aqueous slurry comprising a fibrous filler, a base binder, and water is formed. The aqueous slurry is deposited onto a moving foraminous support wire to form an aqueous felt, thereby creating a continuous process. Thereafter, the aqueous felt is de-watered to form a wet felt.

Abstract: The present invention provides for an acoustically absorbent porous panel that is both rigid and resistant to sagging caused by moisture. The acoustically absorbent porous panel is comprised of at least two layers. The first layer is a facing layer formed from a cured aqueous foamed cementitious material. The foamed cementitious material comprises on a wet basis about 53% to about 68% by weight cement, about 17% to about 48% by weight water, about 0.05% to about 5% by weight fiber, and about 0.01% to about 10% by weight surfactant. Additionally, pores distributed within the cured material comprising about 75% to about 95% by volume of the material. The second layer is a backing layer that is affixed to the facing layer.

Abstract: The invention relates to a sound absorber (A), especially for motor vehicles, comprising a layer (4) of absorption material, such as open-pored or optionally closed-pored foamed material or a wood fibre composite, and a top layer (5). The aim of the invention is to produce an absorber in such a way that said absorber is easy to produce and assemble and functions well. According to the invention, the top layer (5) for leading through a loom of cables (8) or the like is provided with a tubular recess (40) for leading through a loom of cables. Said recess (40) is provided with groove-like undercuts (42) on the outside.

Abstract: A process for producing an acoustically resistive layer, particularly for the nacelles of aircraft jet engines. The process includes producing a structural component by using thermoplastic resins, this component having a given quantity of open surface relative to the acoustic waves to be treated. The structural component is connected to an acoustic metallic fabric having a mesh adapted to the open surface quantity of the structural component. Then, the thermoplastic resin is heated under pressure at high temperature.

Abstract: A soundproofing system is used to insulate sound producing devices or parts of systems, especially vibrating conveyers. Such a system includes insulating elements that are provided with an inner face in the direction of the sound source and an outer face in the direction away from the sound source. A sound absorbing membrane which is made of a textile material and, more particularly, at least partially consists of glass fiber threads and/or woven wire, is arranged in the region of the inner face. The sound absorbing membrane is the inner skin of a covering. The covering includes an outer skin made of textile material. A soft insulating material comprising fiber mat material is arranged together with solid flat material in between the inner and outer skin of the covering. The insulating element offers optimal usage of all three elements, i.e., damping diaphragm, insulating material and at least one reflecting surface on the solid flat material.

Abstract: A sound absorbing structure including a film with through holes formed is laminated on a porous member having communicating voids on the side facing a sound source. At least one of the through holes has an opening area of 19 mm2 or more, and the total of the opening area accounts for 1 to 70% with respect to the area of a film formation surface on the porous member. A soundproof cover including the sound absorbing structure disposed on the inner surface of a cover main body are also provided.

Abstract: This invention relates to a double layer acoustic liner for attenuating noise and consisting of a plurality of cells formed in a plate in a manner to form an array of resonators, and a fluid processing device and method incorporating same.

Abstract: Aerogel particles, in particular in the form of composite materials, are used to deaden structure-borne and/or impact sounds.

Abstract: Shaped, microperforated sound absorbers and methods of making the same are herein provided. In one embodiment, the sound absorber is produced from a polymeric, typically plastic, film having a series of microperforations formed over all or a portion of the film surface. The film is then formed to produce the desired three-dimensional shape. The depth of the three-dimensional shape is controlled to provide the desired cavity depth which, in turn, influences the sound absorption spectrum. After forming, the three-dimensional shape is maintained without the need for additional supports or frames. Deformation of the microperforations due to the forming process does not substantially interfere with the sound absorption properties of the film. Further, film resonance over largely unsupported portions also has little effect on the sound absorption spectrum.

Abstract: A multi-layer acoustically absorptive mat includes a base layer having a peripheral portion with a plurality of apertures formed in the peripheral portion in adjacent, spaced-apart relationship. A face layer disposed adjacent the base layer. An acoustic absorbing layer is interposed between the peripheral portion of the base layer and the face layer. The acoustic absorbing layer includes a respective exposed portion that extends across each of the apertures.

Abstract: The present invention provides a multi-layer damping foil (2) the lower layer (3) of which, facing towards the part (sheet 1) to be damped, has properties which are suitable for the adhering of the damping foil (2) onto the part (1), and the upper layer (4) thereof, facing away from the part (1), does not have the adherence properties, For weight reduction, the lower layer (3) has numerous through openings (7). Advantageously there is provided between the two layers (3, 4) a thin film-like intermediate layer (5) of non-woven fabric, kraft paper or the like, which may likewise have openings (8). The properties bringing about the adherence can be formed by means of an appropriate constituting of the material of the lower layer (3) and/or the mixing in of magnetic or magnetisable particles (parts 10). The layers (3, 4, 5) can be laminated onto one another.

Abstract: A sink, and a method of reducing vibration and resulting noise of such sinks, are disclosed. The sink includes a basin, a drain and first and second pads. The basin has a bottom wall, side walls, and inner and outer surfaces of such walls. The drain is in the bottom of the basin, and first and second regions are defined between the drain orifice and the first and second sides, respectively. The pads are attached to the bottom and a side wall, in each case proximate respective midpoints of open regions thereon. The pads are a laminate of a rubber-like material and metal.

Abstract: An insulating lining that is used as a floor covering and is especially useful in providing acoustic insulation. The insulating lining consists of a covering layer and a cell layer with a plurality of cells. The cells are defined by lateral cell walls and are open on the bearing surface side. The cell walls of the cell layer have spacers on the bearing surface side so that when the insulating covering is in place air which is enclosed in each cell can communicate directly with the airspace in each adjacent cell through a lateral space between the bearing surface and the bottom edge of the cell wall between each pair of adjacent cells.

Abstract: Sound attenuating composite articles for use within vehicles as floor coverings and other interior trim components are provided. A sound attenuating composite article includes a damping layer, decoupler layer, scrim/web layer, and a porous upholstery material sandwiched together. The damping layer has a thickness of less than about 5 mm and is configured to be attached to a surface of a panel of a vehicle (e.g., a sheet metal or polymeric component of a vehicle, such as a floor panel, door panel, etc.) in face-to-face contacting relationship therewith. The decoupler layer has a thickness of less than about 70 mm and is attached to a surface of the damping layer in face-to-face contacting relationship. The scrim/web layer has a thickness of less than or equal to about two millimeters (2 mm). The porous upholstery material (e.g., carpeting) is attached to a surface of the scrim/web layer of material in face-to-face contacting relationship therewith.

Abstract: The invention provides a method for acoustic closure of an installation of a row of sound isolation modules within a host building encompassing the modules. One or more acoustic absorbing closure panels are mounted to form a partition in front of the row of modules, thus forming two acoustically separate regions. The absorbing panels are comprised of one or more sound absorbing materials between a front and rear surface. The front surface faces the region exterior to the installation within the host building. The rear surface faces the installation.

Abstract: Sound attenuating laminates, and methods of making the same, are provided. Heat is applied to a surface of a non-woven, fibrous layer of material to form a stratum of melted fibers having a density greater than that of the remainder of the fibrous layer. The density of the melted fibers is effective in attenuating noise traversing the fibrous layer of material. Upholstery material, such as carpeting, is attached to the surface of the heated fibrous layer. The fibrous layer and upholstery material are then subjected to compressive molding pressure to obtain a desired shape. The compressive molding pressure may further tune the sound attenuating properties of the fibrous layer by selectively changing the densities of portions of the fibrous layer.

Abstract: The acoustical support panel according to the invention comprises a membrane of resilient material, such as one obtained with shredded used tires, which is laminated on a base of compression resistant cellulose fibers. This panel has shown a noted increase of insulation from impact and aerial noises. It has an excellent dimensional stability and high resistance to compression.

Abstract: A sound absorbing structure including a sound absorbing member, an air layer, and a resonant sound absorbing structure. The air layer is formed in the rear of the sound absorbing member. The resonant sound absorbing structure includes a slit and is formed in the rear of the sound absorbing member. The sound absorbing member is a surface plate covering the rear air layer and the resonant sound absorbing structure, and the sound absorbing member is shaped in one of a plate and plane.

Abstract: The invention relates to an ultralight, sound and shock absorbing component set comprising at least one base layer (2), an intermediate layer (3) and a covering layer (6). The intermediate layer (3) consists of a plurality of hollow bodies (4) arranged next to each other, whose walls are perforated and which thus form a complex labyrinth of hollow spaces. The covering layer (6) preferably has a microporous stiffening layer (8) which generates an airflow resistance of 900 Ns/m3<Rt<2000 Ns/m3. The dimensions of the walls of the hollow bodies (4) are such that they allow for compression of at least 50% at a maximum plateau tension of 0.5 Mpa<&sgr;<1.2 Mpa and inelastically and fully convert an impact energy of approximately 0.5 MJ/m3 into deformation work.

Abstract: A structure and method for absorbing and shielding sound from a source of sound are disclosed having at least four layers including a first panel layer 2, a sound absorbing material layer 3, a first air layer 4 and a second panel layer 6, which are located in a sequence from a source of sound. The sound absorbing material layer 3 has a ventilating property.

Abstract: The invention relates to a method of producing a sound-absorbent insulating element with at least two metallic leaves or sheets (2, 3) in the form of films or sheets. According to said method, at least one of said elements is provided with knobs in such a manner that the limit of elasticity of the respective sheet (2, 3) is exceeded during the knobbing process, resulting in the formation of fissures (4, 11). Said fissures substantially help to improve the acoustic absorption capacity of the insulating element produced according to the inventive method.

Abstract: A damper plate for an automobile wheel by which ride comfort and interior noise characteristics are improved without seriously deteriorating driving stability or unfastening nuts. The damper plate has a structure in which a metal plate and a buffer member are laminated and is inserted between the automobile wheel and an axle.