A baffle or reinforcement element for sealing and/or reinforcing a cavity, in particular a cavity of a vehicle, comprising: a carrier plate with a first plate surface and a second plate surface, and at least a first and a second expandable element, in particular expandable foam element, supported by the carrier plate, wherein the first expandable element covers, at least substantially, the entire first plate surface and forms a first outer surface of the baffle or reinforcement element and the second expandable element covers, at least substantially, the entire second plate surface thereby forming a second outer surface of the baffle element.

Acoustically effective molded part which is dimensionally stable after pressure and heat treatment, consisting of a mechanically solidified staple fiber nonwoven fabric formed from fibers, namely from matrix fibers, bicomponent hotmelt adhesive fibers and thermoplastic adhesive fibers, as well as comprising an outer layer and a middle layer, wherein flattenings formed by adhesive fibers are located on the outer layers of the molded part, there are no flattenings in the middle layer of the molded part, the outer layer has a flattening degree according to the test method mentioned in the description of 25% to 75%, the outer layer has a thickness of 15 μm to 40 μm and the molded part has a specific flow resistance in the range from 1000 to 3000 Pas/m.

Provided are a porous structure and a method of fabricating the same. The porous structure may include an aluminum oxide containing at least one of fluorine and phenyl group. For example, the porous structure may be formed from alumina which contains fluorine or phenyl group. The method of fabricating the porous structure may include preparing an aluminum precursor including at least one of fluorine and phenyl group; providing a precursor solution by mixing the precursor with a solvent; and forming the porous structure having 3-dimensional network structure including the aluminum oxide containing the at least one of fluorine and phenyl group from the precursor solution through gelation.

Low-density thermoplastic expandable microspheres are disclosed. Various low-density structures, in particular, sandwich panels, based on foam prepared from the low-density microspheres, are also disclosed. Process of preparing low-density polymeric microspheres, per se, and the corresponding low-density structures, based on the microsphere foam, are also disclosed.

An inner barrel may comprise: a perforated top sheet; a backskin; a core disposed between the perforated top sheet and the backskin; and an insulator coupled to the backskin, the insulator comprising a polymeric material.

Disclosed is a method for manufacturing a soundproofing board part having improved sound absorption performance. The soundproofing board part is manufactured by using, as a material, a recycled soundproofing material which contains a polyurethane foam having excellent sound absorption performance and impact resilience during the press molding; and by producing a sound absorption part on the back surface of the soundproofing board part through a remolding processing method. Also disclosed is a soundproofing board part manufactured by the method. Accordingly, sound absorption performance of the soundproofing board part is improved by about 20% or greater, manufacturing cost thereof may be reduced by recycled resources utilizing waste sheets, and manufacturing process may be simplified compared the related art.

A fibrous component for a vehicle exterior includes a skin layer having a multilayer structure comprising a laminated web including a reinforcing fiber and a binder fiber, the skin layer including pores that absorb sound; a sound absorbing pad layer disposed on an inner side of the skin layer and absorbing sound; and an adhesive layer disposed between the skin layer and the sound absorbing pad layer. The adhesive layer adheres the skin layer and the sound absorbing layer to each other.

A manufacturing method of an acoustic coating in an ordered array of interconnected micro-channels intended to receive, on a reception surface, an incident acoustic wave with direction Ac normal to this surface, the method including depositing a sacrificial material on a substrate surface to form a three-dimensional scaffold of filaments, infiltrating at least one part of the three-dimensional scaffold with a thermosetting material, solidifying the thermosetting material to form a solidified material, and removing the sacrificial material from the solidified material to form the ordered array of interconnected micro-channels, the filaments forming by superimposed layers the three-dimensional scaffold being, for a given layer of filaments, oriented in a direction forming, in a plane formed by the layer, a first angle θ relative to the direction Ac of the incident acoustic wave, to confer acoustic properties to the ordered array of interconnected micro-channels and thus form the acoustic coating.

A high frequency attenuating device for an air flow induction system of a vehicle employing a thermoformed fibrous mat of any shape that fits robustly inside the duct. The dissipative nature of the fibrous mat helps in achieving broadband attenuation in the high frequency regime. The ability to manufacture the fibrous mat into any shape helps with restriction, targets different attenuation bands, and makes it more feasible to manufacture. Hybrid solutions are possible when combined with low frequency perforated silencers or high frequency QWT arrays injection molded onto them.

A method for obtaining a heat-insulating and sound-absorbing composite product consisting in a fibrous material (MF) and in a polymeric material (MP) comprises the steps of positioning the fibrous material (MF) in a mould (1) equipped with a cavity that is only partially filled in a central zone thereof, overlapping polymeric material (MP) to the fibrous material (MF), approaching a counter-mould (3) provide with a counter-cavity (4) to the mould (1), expanding of the polymeric material (MP) by chemical reaction, forming the composite positioned between mold (1) and counter-mould (3), removing the counter-mould (3) from the mould (1) and extracting a product. After the step of forming the polymeric material (MP) covers the fibrous material (MF) in the central zone of the cavity and fills a peripheral groove (7) of the cavity of the mold (1). Further, a moulding equipment and the product so obtained are described.