Class / Patent application number | Description | Number of patent applications / Date published |
181292000 | With perforated or porous face and honeycomb-like core | 54 |
20080223655 | Acoustic Absorber for Aircraft Engines - The present invention relates to an acoustic absorber that is particularly suitable for aircraft engines and has a honeycomb-shaped 3-dimensional structure, which absorbs engine noise when used in an engine. The structure has a plurality of folded honeycomb structures formed by folding a flat semi-finished product. | 09-18-2008 |
20080230310 | Curved Panel for Acoustical Shell, Method of Manufacturing the Same, and Acoustical Shell Using the Same - The present invention provides an acoustical shell for stage sets which is light and easily handled, which has no deformation of a curved surface for a long-period installation, in which a surface to reflect sound is broad and it is possible to prevent a resonance phenomenon due to a cavity, thereby providing an excellent efficiency of reflecting the sound, without eliminating even any small sound. A method of manufacturing the acoustical shell according to the present invention comprises making a laminate board by bonding a melamine pasteboard and 2 to 4 sheets of plywood or MDF using adhesives, securing the laminate board into a wood winding machine made in a curved surface shape and applying a high frequency heat-treatment such that a bending is fixed to form a curved shape, making a upper board and a lower board using the curved board, adhesively inserting a plastic board attached framing members for edging between the upper and lower boards to be pressed for integrating, thereby manufacturing a curved panel. Then, the upper and lower ends and the right and left side ends of the curved panel are overlaid with aluminum profiles, thereby completing the acoustical shell. | 09-25-2008 |
20080251315 | Acoustic septum cap honeycomb - An acoustic structure that includes a honeycomb having cells in which septum caps are located. The septum caps are formed from sheets of acoustic material and include a resonator portion and a flange portion. The flange portion has an anchoring surface that provides frictional engagement of the septum caps to the honeycomb cells when the caps are inserted into the honeycomb during fabrication of the acoustic structure. An adhesive is applied to the anchoring surface of the septum caps after the caps have been inserted into the honeycomb cells to provide a permanent bond. | 10-16-2008 |
20080257642 | Perforated soundproof structure and method of manfacturing the same - A perforated soundproof structure is formed by oppositely arranging an external plate | 10-23-2008 |
20090071748 | SEALING SYSTEM AND METHOD FOR SEALING A COMPONENT WITHIN AN ELECTRONIC DEVICE - A sealing system for sealing a component ( | 03-19-2009 |
20090166127 | Sandwiich panel for sound absorption - An aircraft cabin panel for sound absorption, with a sandwich construction, comprising a core layer that comprises a plurality of tube-like or honeycomb-like cells that extend in an open manner across the thickness of the core layer and that are separated from each other by cell walls and that are uniform in design. A first cover layer faces away from the sound field, as well as a second cover layer that faces towards the sound field and that comprises a plurality of perforation holes and adjacent cells are interconnected by way of apertures in the cell walls. The perforation of the second cover layer comprises a distance (b) between holes, which distance exceeds the opening width (c) of the cells of the core layer, wherein the first cover layer is closed and wherein the cell walls comprise a perforation so that they are acoustically transparent in the direction parallel to the cover layers. | 07-02-2009 |
20090173571 | Aircraft Trim Panel with Integrated Adjustable Acoustic Properties - A trim panel for an aircraft interior includes a first sound attenuating layer, a structural layer and a second sound attenuating layer. The structural layer is coupled to the exterior sound attenuating layer, and has an exterior side and an opposite interior side. The structural layer defines a plurality of passages that open to both the exterior side and the interior side so as to minimize radiation of noise due to a hydrodynamic shortcut created by each of the passages across the structural layer. The second sound attenuating layer is coupled to the structural layer and has a high sound absorption characteristic. The second sound attenuating layer is configured to be disposed adjacent to the aircraft interior. | 07-09-2009 |
20090173572 | Sandwich panel for sound absorption - An aircraft cabin panel for sound absorption, with a core layer that comprises a plurality of cells that extend in an open manner across the thickness of the core layer and that are separated from each other by cell walls, and with a first cover layer that faces away from the sound field, as well as a second cover layer that faces towards the sound field and that comprises a plurality of perforation holes. The second cover layer is multi-layered and apart from a layer with the perforation also comprises a second layer that acts as a flow resistance device. The second layer is arranged on the outside, and visually closes off the perforation, and the outer layer comprises an air-permeable woven fabric. | 07-09-2009 |
20090250293 | ACOUSTICALLY OPTIMIZED CABIN WALL ELEMENT - A wall element for the sound-insulating interior lining of a transport device, comprising at least one sandwich element, at least one insulation package and at least one absorber plane element. The sandwich element comprises at least one core layer, a first cover layer and a second cover layer, wherein the first cover layer and the second cover layer are each arranged on one side of the core layer. At least the first or the second cover layer is a microperforated layer; the sandwich element possesses a shear rigidity that is adjusted in such a way that the sandwich element comprises one or several coincidence boundary frequencies that are determined by the shear rigidity, which coincidence boundary frequencies are outside the frequency range that dominates the noise in the interior of the cabin; and the shear rigidity of the sandwich element at the same time is sufficient for said sandwich element to be used as an interior lining. Sound-insulating interior lining according to the aspects according to the invention provides adequate sound insulation also in the lower frequency range of below 500 Hz, without increasing the weight of the interior lining when compared to the weight of conventional interior linings. | 10-08-2009 |
20100012423 | ACOUSTIC TREATMENT DEVICE FOR TURBINE AND COMBUSTION NOISES - An acoustic treatment device for an internal primary ejection duct from a turbojet pod, including an upstream zone and a downstream zone relative to an airflow direction in the primary ejection duct, the upstream and downstream zones being located on each side of a separating wall with a first face on the side of the upstream side and a second face on the side of the downstream side. The separating wall is a micro-porous wall and the face of the separating wall located on the side of the downstream side is covered by a honeycomb structure to attenuate high frequency acoustic waves. Such a device may find application to treatment of combustion and turbine noises. | 01-21-2010 |
20110073407 | ACOUSTIC SEPTUM CAP HONEYCOMB - An acoustic structure that includes a honeycomb having cells in which septum caps are located. The septum caps are formed from sheets of acoustic material and include a resonator portion and a flange portion. The flange portion has an anchoring surface that provides frictional engagement of the septum caps to the honeycomb cells when the caps are inserted into the honeycomb during fabrication of the acoustic structure. An adhesive is applied to the anchoring surface of the septum caps after the caps have been inserted into the honeycomb cells to provide a permanent bond. | 03-31-2011 |
20110147119 | POROUS NONWOVEN SCRIMS IN ACOUSTICAL PANELS - An acoustical building panel and method of manufacturing it are disclosed. Embodiments of the panel include a porous nonwoven scrim, a coating deposited on the scrim, a base mat, and an adhesive deposited on either the base mat or the scrim in a discrete form such as in droplets. Embodiments of the method of manufacture include steps of perforating the base mat, applying the adhesive to the base mat in the discrete form, laminating the scrim onto the base mat, and applying the coating to the scrim surface. | 06-23-2011 |
20110186380 | Soundproofing Panel - The aim of the invention is to improve acoustic insulation panels of the prior art by proposing a rigid, light panel, the acoustical absorption performance of which is improved thanks to the use of a grid the structure of which enables the same to contribute to the noise absorption function. To this end, the present invention relates to an acoustic insulation panel including two facing panels ( | 08-04-2011 |
20120037448 | SYSTEM AND METHOD FOR NOISE SUPPRESSION - Systems and methods for noise suppression are disclosed herein. In one embodiment, an acoustic structure has a core that includes a plurality of cells. Each of the plurality of cells includes one or more engaging structures for positioning a septum relative to the cell. The acoustic structure further includes a plurality of septums positioned relative to the plurality of cells. | 02-16-2012 |
20120037449 | ACOUSTIC HONEYCOMB WITH PERFORATED SEPTUM CAPS - An acoustic structure that includes a honeycomb having cells in which septum caps are located. The septum caps are formed from sheets of flexible material that may be perforated before or after the material is inserted into the honeycomb. The flexible material is sufficiently flexible to allow folding into the shape of a septum cap. The flexible material is also sufficiently stiff to provide frictional engagement and locking of the septum cap to the honeycomb cell when the cap is inserted into the honeycomb during fabrication of the acoustic structure. An adhesive is applied to the septum caps after the caps have been inserted into the honeycomb cells to provide a permanent bond. | 02-16-2012 |
20120090916 | SOUND BARRIER FOR AUDIBLE ACOUSTIC FREQUENCY MANAGEMENT - A sound barrier comprises a substantially periodic array of structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a porous medium other than a porous metal, the porous medium having a porosity of at least about 0.02, and wherein the other of the first and second media is a viscoelastic or elastic medium. | 04-19-2012 |
20120125711 | SOUND ABSORBING PANEL AND SYSTEM - Disclosed are a sound absorbing panels and a sound absorbing system using such panels, particularly for use in reducing highway and railway noise. The panel includes an enclosure including a first panel face with a number of apertures or holes to allow sound passage, where the ratio of the area of the apertures to the total area of the first panel face is set at a predetermined percentage. The enclosure is configured such that an inner surface of the first panel face is proximate to a fibrous sound absorbing material with an area approximately equal to the total area of the first panel face. The panel enclosure may have various shapes and configurations for optimal sound absorption, and may be configured in a sound absorbing system such that one or more of the panels are mountable to existing structures, such as sound barrier walls in a retrofit manner. | 05-24-2012 |
20120160602 | IMAGE FORMING APPARATUS - The image forming apparatus in this disclosure includes a main body, a plate-shaped frame member, a perforated portion, a sound generating source, an external cover member, and a space forming portion. The plate-shaped frame member configures a part or the whole of the side surface of the main body. The perforated portion has a plurality of holes and is formed in the frame member. The sound generating source is an inner portion of the main body and is disposed at a position corresponding to the perforated portion. The external cover member is disposed at and separated by a predetermined distance from the frame member on an outer side of the frame member. The space forming portion forms a space between the perforated portion and the external cover member that is tightly enclosed except for the perforated portion. | 06-28-2012 |
20120168248 | NOISE ATTENUATION PANEL AND A GAS TURBINE COMPONENT COMPRISING A NOISE ATTENUATION PANEL - A noise attenuation panel includes a first wall, a second wall and partition walls connected to the first and second walls and defining cells between the first and second walls. The first wall is provided with a plurality of through holes. At least two of the cells are interconnected via a communication hole. One of the through holes leads to a first of the at least two interconnected cells and a second of the interconnected cells is configured to prevent any gas flow through the second cell. | 07-05-2012 |
20120285768 | SYSTEM AND METHOD FOR NOISE SUPPRESSION - Systems and methods for noise suppression are disclosed herein. In one embodiment, an acoustic structure has a core that includes a plurality of cells. Each of the plurality of cells includes one or more engaging structures for positioning a septum relative to the cell. The acoustic structure further includes a plurality of septums positioned relative to the plurality of cells. | 11-15-2012 |
20130020148 | PARTITION PANEL - Disclosed is a partition panel capable of improving sound insulation performance and optimizing a reverberation time. The partition panel has sound absorption and insulation functions, comprising: a front plate having a perforated section with a plurality of through-holes and an entirely-continuous peripheral edge portion located outside the perforated section; an entirely-continuous back plate disposed on a side opposite to a sound source across the front plate; an inner perforated plate disposed between the perforated section of the front plate and the back plate; a front-side honeycomb core interposed between the perforated section and the inner perforated plate; a back-side honeycomb core interposed between the back plate and the inner perforated plate; and a peripheral honeycomb core interposed between the peripheral edge portion of the front plate and a region of the back plate opposed to the peripheral edge portion. | 01-24-2013 |
20130025967 | Acoustic Array of Polymer Material - The invention is an acoustic liner for attenuating noise in rotating machinery. The acoustic liner may include a plurality of cells coupled together to form an annular cell matrix, the plurality of cells being made of a non-metallic material, for example, plastics, polymers, thermoplastics, or thermosets. Each cell of the acoustic liner may be hexagonally-shaped such that the annular cell matrix forms a honeycomb structure. | 01-31-2013 |
20130062143 | ANCHORING OF SEPTUMS IN ACOUSTIC HONEYCOMB - A honeycomb structure that includes cells in which septums are located to provide acoustic dampening. The cells are formed by at least four walls wherein at least two of the walls are substantially parallel to each other. The septums include warp fibers and weft fibers that are substantially perpendicular to each other. The septums are oriented in the honeycomb cells such that the weft fibers and/or warp fibers are substantially perpendicular to the parallel walls. | 03-14-2013 |
20130087408 | METHOD FOR PRODUCING A DOUBLE-LAYER OR TRIPLE-LAYER SOUND-ABSORBING PANEL AND CORRESPONDING SOUND-ABSORBING PANEL - A method for producing a double-layer or triple-layer sound-absorbing panel ( | 04-11-2013 |
20130146393 | METHOD FOR PRODUCING AN ACOUSTIC TREATMENT PANEL - A method for producing an acoustic treatment panel, including:
| 06-13-2013 |
20130153331 | BROADBAND SOUND ABSORBER - The invention relates to a broadband sound absorber ( | 06-20-2013 |
20130186707 | UNKNOWN - An acoustic absorber includes a wall provided with a plurality of apertures as well as a substantially non-perforated second wall, with the first wall and the second wall being spacedly arranged to one another, and at least one honeycomb structure being provided between the walls, with the honeycomb structure having a substantially cylindrical recess in at least one area, with a funnel element opening to the first and second walls being provided in the recess, and having a height greater than the distance of the walls, with the second wall being designed pot-like in the area of the funnel element. | 07-25-2013 |
20130206503 | Acoustic Panel and Method of Forming - A disclosed embodiment provides an acoustic panel having a composite laminate panel having a back sheet layer, a face sheet layer, and a core layer disposed therebetween. The core layer has one or more depressions at an interface between the core layer and the face sheet layer, with the face sheet having a generally uniform thickness across the composite laminate panel. A hole extends through the composite laminate panel at the depressions, and a bolt assembly extends through the hole such that it is countersunk. | 08-15-2013 |
20130206504 | THERMAL-ACOUSTIC SECTIONS FOR AN AIRCRAFT - Embodiments of thermal-acoustic sections for an aircraft for reducing noise along an acoustic path produced from an acoustic source are provided herein. The thermal-acoustic section comprises a first porous layer having a first characteristic acoustic impedance. A second porous layer is disposed adjacent to the first porous layer and has a second characteristic acoustic impedance that is greater than the first characteristic acoustic impedance. The thermal-acoustic section is configured to be positioned along the acoustic path such that at least a portion of the noise from the acoustic source is directed through the first porous layer to the second porous layer to promote absorption of the noise. | 08-15-2013 |
20130264147 | SOUND ABSORPTION PANEL - Sound absorbency is imparted on a panel, which has increased strength and rigidity, by laminating a foam resin that is not originally permeable and does not absorb sound, and surface sheets that are not originally permeable and do not absorb sound. A sound absorption panel | 10-10-2013 |
20130292202 | METHOD FOR REPAIRING AT LEAST A PORTION OF AN ACCOUSTIC PANEL - The present disclosure relates to a method for repairing a portion of an acoustic panel for a nacelle of an aircraft turbojet engine. The panel includes an acoustic skin in which a plurality of acoustic holes are drilled, a solid skin, and a cellular acoustic structure. The cellular acoustic structure, being arranged between the acoustic skin and the solid skin, has a plurality of cells, each of which has one or more drainage openings arranged in one or more of the walls forming each cell. The method includes a step of: defining a part of the acoustic panel to be cut; forming a cutting area closed by the acoustic skin; injecting a resin through the acoustic holes; positioning a replacement cellular acoustic structure in the cutting area and on the acoustic skin; forming a solid replacement skin on the replacement cellular acoustic structure. | 11-07-2013 |
20130299274 | ACOUSTIC STRUCTURE WITH INCREASED BANDWIDTH SUPPRESSION - The bandwidth or acoustical range of a nacelle or other type of acoustic structure is increased by acoustically coupling honeycomb cells together to form pairs of acoustic cells that have an effective acoustic or resonator length that is up to twice that of either acoustic cell taken alone. | 11-14-2013 |
20130306402 | METHOD FOR THE PRODUCTION OF A SOUND ABSORBER, ESPECIALLY FOR A GAS TURBINE EXHAUST CONE - The present invention relates to a method for manufacturing a body provided with a honeycomb structure, which body is designed preferably axis-symmetrical, with sheet-metal parts being provided with a wave-like structuring by means of a forming process and formed to ring elements, with the sheet-metal parts being shaped and designed in a substantially identical way as regards their structuring, with adjacent sheet-metal parts being arranged offset to one another and then joined together to form the honeycomb structure. | 11-21-2013 |
20130306403 | METHOD FOR THE PRODUCTION OF A SOUND ABSORBER, ESPECIALLY FOR A GAS TURBINE EXHAUST CONE - The present invention relates to a gas-turbine exhaust cone having an outer wall, which is provided with a plurality of recesses, a honeycomb-structured layer, which is arranged on the inside of the outer wall and extends along the inside of the outer wall, an inner wall, which extends substantially parallel to the outer wall and is connected to the honeycomb structure, and at least one annular chamber, which adjoins the inner wall and is centered relative to a central axis, with the inner wall being provided with passage recesses 33-connecting the area of the honeycomb structure to the annular chamber. | 11-21-2013 |
20130313039 | METHOD FOR REPAIRING A SOUND ATTENUATION PANEL - A method for repairing a sound attenuation panel is disclosed. The panel includes a structuring skin in metal material, a resistive layer in metal material and a honeycomb structure as acoustic absorption material directly added onto the structuring skin and resistive layer. The method includes a step in which one reinforcing pin is inserted into the thickness of the attenuation panel and a step in which the reinforcing pin is secured by welding in a controlled atmosphere to the structuring skin and resistive layer respectively. | 11-28-2013 |
20140034417 | SPLICING OF CURVED ACOUSTIC HONEYCOMB - Honeycomb sections are bonded together with seams made up of an adhesive that is carried by a linked-segment seam support. The seams are particularly useful for splicing together curved honeycomb sections that contain acoustic septum. The curved acoustic honeycomb sections are spliced or seamed together to form engine nacelles and other acoustic damping structures. | 02-06-2014 |
20140054108 | Sheet-Like Finishing Element - A panel-like/sheet-like finishing element ( | 02-27-2014 |
20140060965 | ACOUSTIC PANEL - Disclosed is an acoustic panel that includes a surface element including fibrous material. The acoustic panel also includes a back element that has a honeycomb structure and includes fibrous material, and an intermediate element that is arranged between the surface element and back element and has a porous structure. | 03-06-2014 |
20140110188 | ANCHORING OF SEPTUMS IN ACOUSTIC HONEYCOMB - A honeycomb structure dial includes cells in which septums are located to provide acoustic dampening. The cells are formed by at least our walls wherein at least two of the walls are substantially parallel to each other. The septums include warp fibers and weft fibers that are substantially perpendicular to each other. The septums are oriented in the honeycomb cells such that the weft fibers and/or warp fibers are substantially perpendicular to the parallel walls. | 04-24-2014 |
20140131136 | ACOUSTIC STRUCTURE WITH INCREASED BANDWIDTH SUPPRESSION - The bandwidth or acoustical range of a nacelle or other type of acoustic structure is increased by acoustically coupling honeycomb cells together to form pairs of acoustic cells that have an effective acoustic or resonator length that is up to twice that of either acoustic cell taken alone. | 05-15-2014 |
20140138181 | SOUND-TRANSMITTING MEMBRANE AND ELECTRONIC DEVICE EQUIPPED WITH SOUND-TRANSMITTING MEMBRANE - A sound-transmitting membrane ( | 05-22-2014 |
20140202789 | INTERMEDIATE ACOUSTIC SKIN AND THE IMPLEMENTATION THEREOF - A septum includes two septum plates and the edges of the septum plates are brought into contact at one of the junction edges of the septum plates. In particular, an angle (α) between one of the junction edges of the septum plates and one of the sides of the septum plates adjacent to the one of the junction edge is less than 90°. | 07-24-2014 |
20140216845 | THERMAL-ACOUSTIC SECTIONS FOR AN AIRCRAFT - Embodiments of thermal-acoustic sections for an aircraft for reducing noise along an acoustic path produced from an acoustic source are provided herein. The thermal-acoustic section comprises a first porous layer having a first characteristic acoustic impedance. A second porous layer is disposed adjacent to the first porous layer and has a second characteristic acoustic impedance that is greater than the first characteristic acoustic impedance. The thermal-acoustic section is configured to be positioned along the acoustic path such that at least a portion of the noise from the acoustic source is directed through the first porous layer to the second porous layer to promote absorption of the noise. | 08-07-2014 |
20140216846 | METHOD OF MANUFACTURING A SOUND ABSORBING PANEL - The present disclosure provides a method of manufacturing a sound absorbing panel in which a reflective wall on one of faces of a set of sound absorbing cells. In particular, a passage on a portion of a thickness (E) of the set of sound absorbing cells is formed on an opposite face of the one of the faces, while the passage forming a main channel for a communication between sound absorbing cells and for a circulation of a de-icing fluid. | 08-07-2014 |
20140339014 | SOUND BARRIER SYSTEMS - A cellular material barrier system for reducing sound transmission. The cellular material system includes a planar cellular metamaterial arrangement which includes at least one unit cell, the unit cell includes a sound normalizing arrangement, and a planar metamaterial arrangement coupled to the sound normalizing arrangement on a first side, the planar metamaterial arrangement includes a plate, and a frame affixed to the plate, the sound normalizing arrangement configured to normalize incident sound received at non-normal angle to thereby convey sound at normal angles to the planar metamaterial arrangement, the unit cell further comprising a back layer that is coupled to the sound normalizing arrangement on a second side, opposite the first side, the back layer is made from a porous material, including at least one of a fibrous layer, polymeric foams, ceramic foams, and metallic foams. | 11-20-2014 |
20150034415 | Sound Insulating Curtain - A sound-insulating curtain includes a sound-absorbing core formed by laminating porous sheets and films, is covered by covers, and sewn in an integrated manner. Even after being integrally laminated, adjacently laminated layers are not excessively restrained in places other than sewn areas, and therefore displacement and deformation between layers caused by sound pressure can be tolerated. Sound absorption effects are appropriately produced by each layer, which tolerates such displacement and deformation, while reliably maintaining integrity during handling. Thus, the entire curtain maintains the ability to absorb sounds, efficiently attenuates noise that attempts to pass through the curtain, and suppresses the transmission of noise, thereby enabling noise to be reliably prevented from passing through the curtain. | 02-05-2015 |
20150041247 | SOUND WAVE GUIDE FOR USE IN ACOUSTIC STRUCTURES - The bandwidth or acoustical range of an acoustic structure is increased by locating a sound wave guide within the acoustic cell. The wave guide divides the cell into two acoustical chambers. The two chambers provide an effective increase in resonator length of the cell. | 02-12-2015 |
20150041248 | MULTI-SECTIONAL ACOUSTIC SEPTUM - A multi-sectional acoustic septum that includes sections which have different acoustic resistance properties. The multi-sectional acoustic septums extend vertically with the acoustic cell and are capable of increasing the effective acoustical length of the acoustic cell. The multiple acoustic properties provided by the multiple acoustic sections also make it possible to target specific frequency ranges within the overall frequency range of the acoustic cell. | 02-12-2015 |
20150068838 | NOISE CONTROL DEVICE - A noise control flooring system includes a resilient layer of extruded polymer monofilaments and a porous separation layer overlying at least a portion of the resilient layer. The porous separation layer carries a floating solid substrate layer thereupon and enhances the speed of drying of the floating solid substrate layer. | 03-12-2015 |
20150096832 | Acoustic Panel - An acoustic panel device includes a panel member and a mount. The panel member includes a porous material. The mount is arranged to captively support the panel member. The mount can be a frame that surrounds the panel member. The frame can define a channel, and a portion of the panel member is disposed in the channel. | 04-09-2015 |
20150144422 | SOUNDPROOFING CLADDING PANEL, AND AN AIRCRAFT - A self-supporting acoustic insulation panel ( | 05-28-2015 |
20150344142 | ACOUSTICALLY ATTENUATING SANDWICH PANEL CONSTRUCTIONS - An aircraft engine assembly comprising a nacelle configured to surround the aircraft engine having an inlet open to ambient air and an annular acoustic panel provided within the nacelle. Sound emitted from the aircraft engine is attenuated by the annular acoustic panel. The annular acoustic panel comprises an open framework, made from a first material, forming a plurality of cells. | 12-03-2015 |
20160171960 | PROCESS FOR MANUFACTURING A RESISTIVE LAYER FOR AN ACOUSTIC PANEL,AND CORRESPONDING ACOUSTIC PANEL | 06-16-2016 |
20160186395 | HIGH-SOUND-ABSORPTION COMPOSITE MATERIAL FOR TRAFFIC SOUND BARRIERS AND PREPARATION METHOD THEREOF - The present invention discloses a high-sound-absorption composite material for a traffic sound barrier. The surface of a porous sound-absorption material layer is clad with a cladding layer in a sealing way, and the clad parts and joints are in sealed connection. The cladding layer is an expanded polytetrafluoroethylene microporous membrane or a modified membrane of the expanded polytetrafluoroethylene microporous membrane. A preparation method is disclosed, comprising the following steps of cutting the porous sound-absorption material; covering the surface of the porous sound-absorption material with the expanded polytetrafluoroethylene microporous membrane or the modified membrane of the expanded polytetrafluoroethylene microporous membrane; performing sealed connection on the clad parts and joints. By the above approach, the present invention is able to greatly reduce noise, has a soundproof function and a better sound-absorption function, has a prolonged service life, and features environmental protection, flame retardancy, damp-proofing and high plasticity. | 06-30-2016 |