Abstract: A lightweight acoustical panel having a substantially monolithic appearance and high sound absorption capabilities is manufactured at a lower cost than acoustical panels having comparable properties. The panel is formed, punched with pins and coated with a coarse particle coating.

Abstract: According to one aspect of the present invention there is provided an acoustic laminate including: a first layer of viscoelastic acoustic barrier material; a sound absorbing/decoupling batt affixed to the first layer of viscoelastic acoustic barrier material, the batt at rest defining a batt plane; the batt including a plurality of batt fibers; the batt further including retaining fibers, wherein the batt fibers and/or retaining fibers are disposed perpendicular to the batt plane and having end portions thereof disposed at a batt surface, the end portions affixed to the viscoelastic barrier material so that either the first layer of viscoelastic acoustic barrier material or the sound absorbing/decoupling batt itself may be retained in spaced relation from a mounting surface when the laminate is so mounted, the retention being achieved in any orientation by bearing a mass load of the batt or first layer of viscoelastic material along the axis of the affixed batt fibers and/or retaining fibers.

Abstract: The present invention provides a tunable sound absorption facing which includes a cellulosic web and a nonwoven web entangled together. The facing has a controllable air flow resistance.

Abstract: The invention therefore provides glazing which, to ensure improved acoustic insulation properties, requires not only an acoustic polymeric interlayer but also a suitable distribution of the masses of the elements on either side of the interlayer.

Abstract: An improved acoustically and thermally insulating fire-retardant composite material suitable for use in structures such as buildings, appliances, and the interior passenger compartments and exterior components of automotive vehicles is provided. The material is comprised of at least one airlaid fibrous layer of controlled density and composition and incorporating suitable binding agents and additives as needed to meet expectations for noise abatement, fire-retardancy, and mildew resistance. Separately, an airlaid structure which provides a reduced, controlled airflow therethrough useful for acoustic insulation is provided, and which includes a woven or nonwoven scrim. A process for the production of the fire retardant nonwoven material is also provided.

Abstract: The composite material multilayered membrane of the present invention is sound insulating and sound-absorbent, acting as sound deadening insulation for noise impacts, mainly but not exclusively to be used in flooring, and in particular under the slab in floating floors, with the aim of reducing the transmission of noise into the below room. This membrane includes several layers, which include at least one polymeric monofilament three dimensional mat, at least one resilient mat, and at least one topping layer of waterproofing, breathable or not, tissue. This multilayered membrane with a thickness under a weight of 2 kPa of at least 8 and maximum 15 mm, preferably 10-12 mm, so as to achieve a normalized noise level in the disturbed room Lnw below 50 dB, or an impact insulation class of at least 60 points.

Abstract: Laminated glazing (2) comprising a viscoelastic plastic insert (3) comprising at least two damping films (30, 31) each having a loss factor tan ? greater than 0.6 and a shear modulus G? less than 2×107 Pa over two temperature ranges tA et tB respectively, characterized in that the film which has, at a frequency of 200 Hz, the highest loss factor tan ? over a given temperature range included within the temperature range tA or tB, has an equivalent shear modulus G?eq less than the equivalent shear modulus or moduli of the other film or films, with G eq ? = G ? ? e tot e where G? is the shear modulus of the material constituting the film, e is the thickness of the film and etot the total thickness of the insert.

Abstract: The invention relates to an acoustic panel assembly. There is a need for a simple and inexpensive acoustic panel assembly. An acoustic panel assembly includes a rigid panel with an opening. The panel has an edge rib surrounding the opening, and a wall spaced apart from and surrounding the edge rib. The panel assembly also includes a frame member and a sound control sheet. The frame member has an outer border and a plurality of cross-pieces extending between different parts of the border. A compression rib projects forwardly from an inner edge of the border. The sound control sheet is mounted in and fills the opening. The sheet has an outer edge portion held between the rib of the rigid panel, the wall of the rigid panel, the border of the frame and the compression rib of the frame. The compression rib projects into a rear side of the sheet. The sheet forms a shoulder. The shoulder and the edge rib form a coach joint. The frame cross-pieces engaging a rear surface of the sheet.

Abstract: An acoustic inner barrel for an aircraft engine nacelle inlet is constructed from a composite material and is formed as a single, 360-degree annular segment. The barrel includes an inner skin, an outer skin, a cellular core disposed between the inner skin and the outer skin, and at least one crack and delamination stopper extending radially from the inner skin to the outer skin.

Abstract: Panels for use in building construction (partitions, walls, ceilings, floors or doors) which exhibit improved acoustical sound proofing in multiple specific frequency ranges comprise laminated structures having as an integral part thereof one or more layers of viscoelastic material of varied shear moduli which also function as a glue and energy dissipating layer; and, in some embodiments, one or more constraining layers, such as gypsum, cement, metal, cellulose, wood, or petroleum-based products such as plastic, vinyl, plastic or rubber. In one embodiment, standard wallboard, typically gypsum, comprises the external surfaces of the laminated structure.

Abstract: A ceiling panel assembly is provided, including: a sound damping layer including a constraining layer and a first viscoelastic layer; and an acoustical absorption layer coupled to the sound damping layer. A suspended ceiling assembly is provided, including: a support structure attached to a structural ceiling of a room, the support structure including a plurality of support flanges; and a plurality of ceiling panel assemblies, each ceiling panel assembly positioned on the support flanges and comprising a sound damping layer including a constraining layer and a first viscoelastic layer. A method of manufacturing a ceiling panel assembly is provided, the method including: providing a sound damping layer including a constraining layer and a viscoelastic layer; and applying an acoustical absorption layer to the sound damping layer.

Abstract: A laminated panel is provided including a first layer of material having external and internal surfaces; a second layer of material having external and internal surfaces; a layer of viscoelastic glue in contact with the internal surface of said first layer of material and with the internal surface of said second layer of material; said glue including an acrylic polymer in a concentration between 10% and 60% by weight, or a tackifier in a concentration between 1% and 70%; or a plasticizing compound in a concentration between 0% and 15%; or a material with Tg greater than 0° C. in a concentration between 0% and 30%. A soundproof assembly is also provided including a first and second panel; at least one spacer between the panels, and a gap between the panels, wherein at least one of the panels comprises a laminated panel as provided above.

Abstract: The present invention relates to a method for vibration damping and noise reduction by using thermoplastic vulcanizate compositions and to multilayer structures for use in vibration damping and noise reduction applications comprising at least one polymeric layer made of a thermoplastic vulcanizate composition.

Abstract: The invention relates to a multilayered acoustically and thermally effective insulation having a defined layer structure, especially for internal combustion engines of motor vehicles.

Abstract: Disclosed is a sound-absorbing material, which has a flow resistivity R of 3.3×104 N·s/m4 or more, a Young's modulus E of 1.2×103 to 2.0×104 N/m2, and a loss factor ? of 0.12 or less. The sound-absorbing material of the present invention can enhance a sound absorption capability in a wide range of a low/intermediate-frequency region to a high-frequency region at a higher level as compared with conventional sound-absorbing materials.

Abstract: A soundproofing assembly includes stacked layers in the form of a first set of layers (36) having good resistance to the passage of air, and a second set of layers (24) with mass-spring function including a layer (28) having a heavy viscoelastic mass and a spring type layer (26); the first set of layers includes a layer (36) of a foam with open cells of high porosity, high tortuosity and good resistance to the passage of air, the layer (36) having, owing to its high tortuosity, excellent sonic absorption properties at medium and high frequencies. The invention is useful for soundproofing motor car passenger compartments.

Abstract: A composite headliner material allows sound waves originating within a vehicle to penetrate deeply into the headliner where all of a significant portion of their energy is absorbed rather than reflected back into the vehicle. The coverstock sheet is backed by a multilayer material with a foam core coated above and below by a fibrous glass mat impregnated with an adhesive with scrim layers above and below glass mat layers.

Abstract: A device (10) for reducing noise and heat emissions from a laboratory instrument in a laboratory, comprising a casing (20) with sound-absorbing walls (240), wherein the casing (20) forms an interior space (210, 220) for accommodating the laboratory instrument. At least one of the sound-absorbing walls (240) has an air inlet (30). The device (10) further has a flue (40) arranged on one of the sound-absorbing walls (240), so that the interior space (210, 220) of the casing (20) can be vented via the air inlet (30) and the flue (40). During operation of the laboratory instrument situated in the interior space (210, 220) of the device (10), the sound generated by the laboratory instrument is absorbed by the walls, so that essentially no noise, or only significantly reduced levels of noise, generated by the laboratory instrument can escape the device (10).

Abstract: A method of forming a panel constrained layer damper treatment from a laminate, having a panel and a visco-elastic layer attached thereto, by forming a panel constrained layer damper from the laminate to a predetermined shape is provided. Additionally, the method of the present invention includes attaching the panel constrained layer damper to a substrate to form the panel constrained layer damper treatment. The method may also include subjecting the panel constrained layer damper to heat energy to bond the visco-elastic layer to the substrate. In addition, various methods of attaching the panel constrained layer damper to the substrate are provided.

Abstract: Noise suppression materials and methods of manufacturing noise suppression materials are provided. In an embodiment, by way of example only, a fibrous material includes a network of a plurality of fibers selected from a group consisting of glass fibers and ceramic fibers, the plurality of fibers including a first fiber and a second fiber, the first fiber having a first low melt component and a first high melt component, the first low melt component of the first fiber having a first melting point, the first high melt component of the first fiber having a second melting point that is higher than the first melting point, wherein the first low melt component of the first fiber extends alongside and is adjacent to at least a segment of the first high melt component of the first fiber and is bonded to the second fiber at a contact point.

Abstract: An absorbent structure for reducing the propagation of soundwaves emitted by noisy devices such as rotors or motors, the structure includes a rigid partition (1), at least one porous wall (4), and separator elements (2) for placing the porous wall (4) at a determined distance from the rigid partition (1), defining cavities (3) of a height h1 between the porous wall (4) and the rigid partition (1), the height h1 being determined to obtain maximum absorption of a given frequency of the emitted soundwaves, wherein includes additional absorption elements for obtaining maximum absorption of at least one additional frequency of the emitted soundwave.

Abstract: An apparatus comprises an agglomeration of adsorbing members, each of the adsorbing members comprising a porous outer layer configured to enclose an amount of adsorbent material, the agglomeration being configured such that every cross-section through the agglomeration comprises at least one gap between adjacent adsorbing members.

Abstract: This method includes the placing of the first porous layer (1) onto one part of a wall of a mould cavity having the shape desired by the soundproofing component, the first layer (1) not occupying the entire cavity, and the injection of a foaming polymer composition into the cavity of the mould to form the second open-cell porous layer (3). The two steps of placing the practically airtight intermediate layer (2) onto the first porous layer (1) and of injecting a polymer composition in order to form the second porous layer (3) are carried out simultaneously in a single step of injecting the foaming polymer composition.

Abstract: An example embodiment of an acoustic treatment for an engine having at least one engine component extending substantially therefrom includes a base layer having a first base surface and an opposing second base surface. The first base surface is configured to mate with an exterior surface of the engine. The example embodiment also includes a secondary layer having a secondary layer mating surface and an opposing secondary layer outer surface. The secondary layer mating surface is configured to mate with the second base surface at a mating interface. The interface provides a pass-through location for the at least one engine component.

Abstract: An acoustic equipment mat is formed by arranging plural grain pieces of inexpensive silica gel in a single layer. When the mat is disposed under an acoustic equipment, the grain pieces have their upper ends in point contact with a bottom or the like of the acoustic equipment and have their lower ends in point contact with the underlying floor or the like. Hence, the mat 1a is notably reduced in the area of contact with the acoustic equipment or the like, so as to reduce the reflection of vibrations. In addition, the mat 1a is capable of extremely quickly dissipating, in the atmosphere, the vibrations directly propagated to the upper-end side thereof and the vibrations indirectly propagated thereto as reflected by the lower-end side thereof.

Abstract: The object of the present invention is to provide a soundproofing material that is lightweight and has sufficient soundproofing performance. The present soundproofing material includes a frame body including a planar portion and a wall body installed upright on the planar portion and a soundproofing laminate accommodated in a laminate accommodating portion surrounded by the wall body, and the soundproofing laminate has a hard layer consisting of a rubber sheet or the like and a soft layer whose one side of the soft layer is laminated on the hard layer and consists of a felt, a resin foam or the like, and another side of the soft layer is joined to at least one of the planar portion and/or the wall body of the frame body, and a side surface of the soundproofing laminate and a side surface of the wall body are distant from each other. The distance thereof is preferably in the range from 0.3 to 1 mm.

Abstract: A cover part for a vehicle, especially an underbody cover, has a porous core layer and at least one cover layer on each side, wherein the porous core layer is constructed such that it has acoustic transparency or an acoustically absorbent effect. Here, the porous core layer is made either from a thermoplastic matrix with embedded reinforcement fibers, especially glass fibers, whose melting point temperature is higher than the melting point temperature of the plastic matrix, or from a foam, which is either open-cell or closed-cell and perforated. The acoustically absorbent porous core layer is occupied on one or both sides with one or more acoustically transparent or absorbent covering layers.

Abstract: A transparent acoustical sound-absorbing, fire-retardant wall finishing system (100) includes a laminated semi-rigid acoustical planar backer board material (101). A glass textile surface covering (107) is used which includes a decorative woven or flat non-woven face (109) and back surface (111). The flexible surface covering (107) is attached to the laminated semi-rigid acoustical planar backer board material (101) at its back surface (111) so that the face of the material (109) fully covers the backer board material (101) for providing an uninterrupted secondary surface giving the appearance of a finished wall.

Abstract: A composite material comprises a nonwoven layer having a viscoelastic interleaf, which may be positioned mid-ply therein.

Abstract: Panels for use in building construction (partitions, walls, ceilings, floors or doors) which exhibit improved acoustical sound proofing in multiple specific frequency ranges comprise laminated structures having as an integral part thereof one or more layers of viscoelastic material of varied shear moduli which also function as a glue and energy dissipating layer; and, in some embodiments, one or more constraining layers, such as gypsum, cement, metal, cellulose, wood, or petroleum-based products such as plastic, vinyl, plastic or rubber. In one embodiment, standard wallboard, typically gypsum, comprises the external surfaces of the laminated structure.

Abstract: An acoustic panel (1) has a recess (8) extending part or all way down to a facing (7). A panel loudspeaker (11) may be fixed in the recess or a water sprinkler (14) or other device may be mounted in or above the recess.

Abstract: An improved vibration damping system is provided for use with window structures. The window damping system employs both air-film damping technology and viscoelastic damping materials to increase mechanical and/or acoustic vibration damping in window structures.

Abstract: A sound absorbing element, in one example, includes a first wall area, a second wall area as well as a plurality of spring elements. In this arrangement, the first wall area and the second wall area are arranged so as to be spaced apart by a clear space. In one example, the plurality of spring elements are arranged in the clear space and connect the first wall area and the second wall area to each other. By pre-tensioning the plurality of spring elements to a state in which their spring constant approaches zero, significant decoupling between the first and the second wall areas may occur, with accompanying sound noise reduction.

Abstract: The invention relates to a panel for an acoustic treatment at the surface of an aircraft, that comprises from the outside to the inside an acoustically resistive porous layer, at least one cellular structure and a reflective or non-permissive layer, wherein the acoustically resistive porous layer includes, at the outer surface that may contact the aerodynamic flows of a sheet or foil, open areas (14) permissive to sound waves and solid area (6) not permissive to sound waves, characterised in that the sheet or foil of the acoustically resistive layer includes sets of microperforations (18), each set of microperforations defining an open area (14), the set of microperforations being separated by at least one series of spaced bands of solid areas (16).

Abstract: It is an object of the present invention to provide a floor silencer that has good transport efficiency due to an ability to be transported in a flat state, and can be assembled to a floor panel of a vehicle by folding along a band-like concave portion. The floor silencer is used with a first surface side in contact with a floor carpet, and a second surface side in contact with the floor panel of the vehicle. The floor silencer also has the band-like concave portion and can be folded along the band-like concave portion. The floor silencer is transported in a flat state and not folded during transport, and is used folded along the band-like concave portion during assembly.

Abstract: An acoustic panel comprising an inner core sandwiched between outer sheets formed from a different material. According to an embodiment, the inner core comprises a cementicious material that also has fire resistant properties, and the outer sheets comprise metallic sheets. According to an embodiment, the outer sheets include metal tines for forming a bond between the respective metallic sheets and the inner core. The metal tines are formed as projections during the piercing of holes in the metallic sheets. According to an embodiment, the diameter of the holes and/or the thickness and/or composition of the cementicious material can be varied or configured to change the acoustic damping properties of the panel. According to another aspect, the panel comprises a fire resistant acoustic panel suitable for use as a fire protective or blast protection barrier.

Abstract: Herein provided is a sound-insulating laminated structure which is excellent in the ability of insulating low frequency sounds whose frequency falls within the range of from 200 to 1000 Hz. The sound-insulating laminated structure comprises a first glass wool layer, a metal foil layer free of any opening and a second glass wool layer. The first and second glass wool layers are ones each prepared by collecting and combining short glass fibers through the application of an uncured thermosetting phenol resin to the short glass fibers to thus give a web of glass wool prepreg and then molding, with heating, the web into a sound-insulating laminated structure having a desired shape.

Abstract: The present invention relates to a liquid resin intended more particularly for the sizing of mineral fibers which exhibits a dilutability in water at 20° C. at least equal to 1 000% and a level of free formaldehyde preferably of less than 0.4%, expressed as total weight of liquid, this resin being characterized in that it is composed essentially of condensates obtained from a phenolic compound, from formaldehyde and from an aminoalcohol according to the Mannich reaction. The invention also relates to a sizing composition including said resin, to the mineral fibers sized by means of this composition and to the products formed from the mineral fibers, in particular for thermal and/or sound insulation.

Abstract: An optically reflective sound absorbing device (13) comprising a sound absorbing structure (25), and a non-porous optically reflective sound transfer medium (17) that is configured and arranged to transfer sound waves incident on the sound transfer medium (17) to the sound absorbing structure (25) for absorption thereby.

Abstract: A sound-absorbing material, wherein a non-woven fabric with a mass per unit area of 150 to 800 g/m2 and a bulk density of 0.01 to 0.2 g/cm3 and a surface material with an air permeability of not more than 50 cc/cm2/sec measured according to JIS L-1096 are layered.

Abstract: A soundproof material is provided with a first sound absorbing layer arranged on a vehicle panel, a second sound absorbing layer closer to an inner side of a passenger compartment, and an intermediate layer provided between the sound absorbing layers. The intermediate layer is constituted by two layers having a high-density layer and a low-density layer. The air permeability of the intermediate layer is set lower than the first sound absorbing layer and the second sound absorbing layer. The intermediate layer is arranged in such a manner that the high-density layer is adjacent to the second sound absorbing layer.

Abstract: Methods of forming flowbodies and flowbodies are provided. In an embodiment, by way of example only, a method includes providing a first sheet of a first material comprising a metal, providing a second sheet of a second material comprising a composite, attaching a portion of the first sheet to a first position on a preform, securing a portion of the second sheet to a second position on the preform, and winding the first sheet and the second sheet around the preform to form the first flowbody, the first flowbody including a laminate comprising alternating layers of the first sheet and the second sheet.

Abstract: The present composition is a mixture of pozzolanic binder, recycled raw cellulosic materials (mineralized softwood chips and/or particles, hardwood chips and/or particles or a combination of the two and wood based construction waste), sand, ash and/or ground slag that when cured, forms a sound absorptive product and suitable for use in all climates and weather conditions. The primary use for the present composition is for highway sound barrier walls but the product can also be used in any application where a durable sound absorptive material is required, including rail, industrial, tunnel, residential, and existing wall retro-fit applications. The present composition can be used as an absorptive panel or cast monolithically with reinforced concrete which forms a structural and absorptive precast concrete panel.

Abstract: A new acoustic insulating sheet material comprises in laminar assembly a) a primary sound absorbing sheet, and b) a dense porous membrane that i) has an air-flow resistance of about 5000 rayls or less and ii) has an Acoustic Value Ratio as defined herein of at least 3000. Preferably, the membrane is about 200 micrometers or less in thickness, and more preferably is about 150 micrometers or less in thickness. Also, the Acoustic Value Ratio is preferably at least 7,000. The described membrane can also be used alone to acoustically insulate a space, e.g., by mounting it in planar array over an air gap and in position to attenuate noise from a noise source.

Abstract: A composite, light weight flexible, moldable composite acoustic barrier and method of making the same.

Abstract: A method is described for making a composite laminate formed by curing a stacked structure comprising at least two layers of strips of fibrous material impregnated with resin, wherein the strips in adjacent layers have different directional orientations. An apparatus is provided for simultaneously separating a band of fibrous material impregnated with resin into strips and depositing the strips between adjacent pin rows of a pinmat to form the stacked structure.

Abstract: The invention relates to a thin sound absorbing multi-layer assembly, which is intended, in particular, to reduce interior or exterior noise of a motor vehicle. The assembly according to the invention comprises at least three stacked layers consisting respectively of: a first layer (4) being impervious and having an area weight of between (20) to (100 g/m2); a second layer (3) having an air flow resistance of between (250) to (2500 Ns/m3) and an area weight of between (15) to (250 g/m2); a third layer (2) being an open pored, acoustic spring type layer having a thickness of between (2) to (30 mm) and an area weight of between (50) to (1000 g/m2).

Abstract: The invention relates to wood fiber insulating material boards and mats, in which the wood fibers and the binder fibers are aligned three-dimensionally. The fleece of wood fibers and binder fibers can alternatively have synthetic resin granules scattered on it. Likewise, a woven fabric or a film can be applied to one or both sides. The product obtained in this way is heated in a heating/cooling oven, calibrated and/or compacted to the desired final thickness.

Abstract: The invention relates to floor covering comprising two different impact sound attenuating layers 5, 6.

Abstract: A sound absorbing structure is constituted of a housing, a vibration member composed of a closed-cell porous material whose airflow rate is less than 0.1 dm3/s, and an air cavity formed inside the housing in the rear side of the vibration member. Alternatively, the vibration member is formed by laminating an open-cell porous material or an air-permeable member with the closed-cell porous material. The sound absorbing structure demonstrates a high sound absorption in a low frequency range due to the closed-cell porous material.