EP2817799A2 - Absorbant phonique - Google Patents

Absorbant phonique

Info

Publication number
EP2817799A2
EP2817799A2 EP13711565.5A EP13711565A EP2817799A2 EP 2817799 A2 EP2817799 A2 EP 2817799A2 EP 13711565 A EP13711565 A EP 13711565A EP 2817799 A2 EP2817799 A2 EP 2817799A2
Authority
EP
European Patent Office
Prior art keywords
layer
slit
micro
cells
sound absorbent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP13711565.5A
Other languages
German (de)
English (en)
Inventor
Ralf Corin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Noisetech Kb
Original Assignee
Noisetech HB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Noisetech HB filed Critical Noisetech HB
Priority to DE13711565.5T priority Critical patent/DE13711565T1/de
Publication of EP2817799A2 publication Critical patent/EP2817799A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/8209—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only sound absorbing devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B9/0442—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like having a honeycomb core
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B9/045—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like being laminated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/34—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles
    • E04B9/36—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles consisting of parallel slats
    • E04B9/366—Grid-like or open-work ceilings, e.g. lattice type box-like modules, acoustic baffles consisting of parallel slats the principal plane of the slats being vertical
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
    • E04C2/365—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels by honeycomb structures
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape
    • E04B2001/747—Corrugated materials
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape
    • E04B2001/748—Honeycomb materials

Definitions

  • the present invention relates to a sound absorbent comprising a first cover layer, a second cover layer and an intermediate layer, said intermediate layer comprising walls delimiting a plurality of cells open in a first end and a second end, said cells being arranged adjacent one another, said first open end of said plurality of cells being covered by said first cover layer said second open end of said plurality of cells being covered by said second cover layer.
  • It also relates to a method of manufacturing such a sound absorbent.
  • Such a sound absorbent and such a method are known from US-A-4 850 093.
  • the known sound absorbent suffers acoustically from the drawback of an insufficient low sound attenuation.
  • a face plate of titanium is provided with the very small holes by laser drilling. Drilling of a large number of holes is time consuming and thus expensive, in particular since a laser equipment is utilised.
  • the face plate is provided on a cellular/honeycomb core, made for example of paper.
  • a cellular/honeycomb core made for example of paper.
  • it is thus necessary to first perform the laser drilling operation for preventing the paper core from achieving burn damages from the laser beam.
  • excessive glue may enter the laser drilled holes and cause a lower sound attenuation. Consequently, the known production method is complicated, expensive and inefficient from a sound attenuation perspective.
  • the object of the present invention is to provide a sound absorbent, which has an improved sound attenuation.
  • the sound absorbent as initially defined, wherein said first layer is provided with at least one micro-slit by mechanical machining, the micro-slit extending through said fist layer, such that sound waves are allowed to penetrate said micro-slit and to enter the first open end of said cell.
  • said first layer is provided with at least one micro-slit by mechanical machining, the micro-slit extending through said fist layer, such that sound waves are allowed to penetrate said micro-slit and to enter the first open end of said cell.
  • micro-slits in a sound absorbent is known per se from WO 97/27370.
  • micro-slits are made by mechanical machining by a mechanical tool.
  • said second layer is provided with a at least one micro-slit, such that sound waves are allowed to penetrate said micro-slit and to enter the second open end of said cell.
  • the length of said micro-slit is in the range of 2 mm - 2 km, more preferably 10 - 1000 mm, most preferably 100 - 1000 mm.
  • the width of said slit is in the range of 1 micrometer to 1 mm, more preferably 10 micrometer to 0,9 mm, most preferably 0,3 - 0,5 mm.
  • the thickness of said wall is in the range of 10 micrometers to 0,5 mm, more preferably 30 micrometers to 0,3 mm, most preferably 50 micrometers to 0,2 mm.
  • every second wall is shaped by a corrugated sheet or plate, every second wall being a substantially plane sheet or plate arranged between every second corrugated sheet or plate.
  • the thickness of said first layer and optionally of said second layer is in the range of 10 micrometers to 5 mm, more preferably 20 micrometers to 0,9 mm, most preferably 50 micrometers to 0,6 mm.
  • the walls of said intermediate layer are made of a cellulose material, polymer material or metal.
  • said first layer is made of a cellulose material, polymer material or metal.
  • said second layer is made of a cellulose material, polymer material or metal.
  • Suitable cellulose materials are paper, paper-board, veneer, wood, cellulose acetate, cellulose nonwoven, fiber-board, with or without surface treatment.
  • polyethylene PE
  • poly propane PP
  • polyvinylchloride PVC
  • the first layer could for aesthetic purposes me made of e.g. copper, silver or gold.
  • the thickness (t c ) of said intermediate layer is in the range of 1 - 200 mm, more preferably 5 - 50 mm, most preferably 10 - 30 mm.
  • the ratio of cells per square meter of a cross-section of the intermediate layer is within the range of 1 to 100 000 000 more preferably 100 to 1 000 000, most preferably 500 to 200 000. It should be noted that the higher the ratio, the higher the sound absorption.
  • said micro-slit is made by mechanical machining by a mechanical tool.
  • the method includes choosing an intermediate layer of a predetermined material, choosing a first layer of a predetermined layer and choosing a second layer of a predetermined material.
  • the first layer is connected e.g. by gluing to the intermediate layer before the micro-slits are made in the first layer.
  • the second layer is connected e.g. by gluing to the intermediate layer before the micro-slits are made in the second layer.
  • the glue will affect both mechanical stability and vibration damping of the element.
  • the first layer, as well as the second layer are connected e.g. by gluing to the intermediate layer before the micro-slits are made in the first layer.
  • gluing e.g. by gluing to the intermediate layer before the micro-slits are made in the first layer.
  • the slit in the second layer is made after said first layer as well as said second layer are connected to the intermediate layer, before the micro-slit is made in the first layer.
  • mechanical machining includes punching, whereby said mechanical tool is e.g. a punch knife.
  • mechanical machining includes slitting by means of a slitting machine, whereby said mechanical tool is a knife.
  • said mechanical tool is a cutting blade with a cutting edge.
  • the method includes choosing a mechanical tool out of a set of tool sizes to achieve a predetermined slit width, connecting said mechanical tool to a computer numerical control machine, and programming the slit length, the slit depth and the distance between the slits to achieve a desired sound attenuation.
  • the mechanical machining method according to the invention excludes laser machining, cutting by cutting electrodes, and cutting by cutting blowpipes and chemical machining, such as photo-etching, since such methods may destroy parts of the cells, and will have then have a negative influence on the sound attenuation.
  • Fig. 1 illustrates partly in a cut out view a sound absorbent provided with a first layer provided with micro-slits, a second layer and an intermediate layer;
  • Fig 2 is a cross-section of a part of the intermediate layer along a line shown in figure 1 ;
  • Fig. 3 illustrates an intermediate layer with cells of diamond shape cross-section;
  • Fig. 4 illustrates an intermediate layer with cells of square shape cross-section
  • Fig. 5 illustrates an intermediate layer with cells of a corrugated shape cross-section
  • Fig. 6 illustrates an intermediate layer with cells of honey-comb cross-section
  • Fig. 7 illustrates an intermediate layer with cells of another kind of a honey-comb cross-section
  • Figs. 8A-8C illustrate an intermediate layer with cells of varying cross-section
  • Fig. 9 is a magnification of the first layer with micro-slits shown in Fig 1;
  • Fig. 10 illustrates an equipment for manufacturing the micro-slits shown in Figs. 1 and 9;
  • Fig. 11 illustrates interrupted micro-slits
  • Figs 12Aand 12B illustrate differently shaped sound absorbents
  • Figs 13A-13F also illustrate differently shaped sound absorbents
  • Fig 14 illustrates a sound absorbent with angled cells
  • Fig 15 illustrates sound absorbents mounted in the ceiling
  • Fig 16 illustrates a sound absorber as a piece of art
  • Fig 17 illustrates different uses of the sound absorbent.
  • Figure 1 shows a sound absorbent 2 having the shape of a rectangular parallelepiped with substantially equal thickness T, comprising a first layer 4, a second layer 6 and an intermediate layer 8. The latter has likewise the shape of a rectangular parallelepiped with equal core thickness t c .
  • the first layer 4 is made of a cellulose material, polymer material or metal and has a first thickness ti, while the second layer 6 has a second thickness tz.
  • the material of the second layer 6 is of a cellulose material, polymer material or metal, and may be of the same material as the first layer 4, even though the first and second layers may be made of different materials.
  • the total thickness T of the sound absorbent 2 is thus the sum of the first thickness ti, the core thickness t c and the second thickness t2.
  • the first thickness ti of said first layer is in the range of 10 micrometers to 5 mm, more preferably 20 micrometers to 0,9 mm, most preferably 50 micrometers to 0,6 mm.
  • the second thickness ⁇ 2 of said second layer is preferably in the same range as the first thickness ti, but may be thinner or thicker than said range.
  • the second thickness t ⁇ of said second layer may be substantially the same as the first thickness ti.
  • the first layer 4 and the second layer 6 are arranged on opposite sides of the
  • intermediate layer 8 and are thus parallel to one another.
  • the intermediate layer 8 comprises plurality of elongated cells 12, the length of which corresponds to the core thickness t c of the intermediate layer 8.
  • the cells 12 are defined by walls 13, the thickness of which is in the range of 10 micrometers to 0,5 mm, more preferably 30 micrometers to 0,3 mm, most preferably 50 micrometers to 0,2 mm.
  • the walls 13 are made of a cellulose material, polymer material or metal.
  • the core thickness i.e. the thickness t c of the intermediate layer 8 is in the range of 1 - 200 mm, more preferably 5 - 50 mm, most preferably 10 - 30 mm.
  • the elongated cells 12 as such have first and second open ends 14, 16 but are covered by the first layer 4 and the second layer 6.
  • the first layer 4 is provided with a plurality of substantially parallel micro-slits 10, penetrating the first layer 4 substantially through the first thickness tito the intermediate layer 8, hereby connecting the cells 12 to the surrounding air.
  • the ratio of cells per square meter of a cross-section of the intermediate layer 8 is within the range of 1 to 100 000 000 more preferably 100 to 1 000 000, most preferably 500 to 200 000.
  • FIG. 2 shows in cross-section along lines II-II in figure 1, a number of cells 12 of different geometries; each cell 12a is defined by a wall 13 of circular cross-section 18a, while each cell 12b is defined by a wall 13 of a star-shaped cross-section 18b.
  • the star- shaped cells 12b are placed between the circular cells 12a for filling out the residual space between the circular-shaped cells, in order to improve sound attenuation compared to if the spaces were filled with e.g. glue.
  • FIG. 3 shows cells 12 of yet another shape.
  • a plurality of corrugated sheets 20a, 20b are formed to sharp ridges 22 and valleys 24 (i.e. zig-zag form) and are connected to one another at ridges 22 of the second corrugated sheet 20a and valleys 24 of the first corrugated sheet 20a contacting one another.
  • each cell 12 is defined by walls 13, together having a diamond or rhomboid cross-section 18c.
  • a plane sheet is placed between the first and second corrugated sheets 20a, 20b, while the valleys 24 of the first corrugated sheet 20a is connected to one side of the plane sheet, while the ridges 22 of sheet 20b are connected to the opposite side of the plane sheet.
  • each cell 12 is defined by the plane sheet and the walls 13, and the cross-section of the cells will be triangular. It should be noted that for maniifacturing reasons, it is preferable to arrange the valleys and ridges of the first and second sheets 20a, 20b in a mirror shaped manner, such that the valleys and ridges can be connected to the plane sheet simultaneously, e.g. by spot or line welding.
  • Figure 4 shows cells 12 of yet another shape.
  • a plurality of corrugated sheets 20a, 20b is formed to the shape of a square wave.
  • a first plane sheet 26a and second plane sheet 26b are attached to each side of the corrugated sheet 20a.
  • cells 12d are defined by walls 13, together forming a square cross-section 18d.
  • the cross-section of the cells will be square.
  • the corrugated square wave sheets 20c may be connected to one another without the sheet 26a, 26b (in a manner corresponding to that of Fig 3), whereby the cross-section of the cells will be rectangular.
  • Fig. 5 shows an alternative configuration of the intermediate layer 8, according to which plane sheets 26a, 26b, 26c etc. are put between sinus- wave shaped sheets 20a, 20b, 20c etc.
  • the cross-section of the cells will be half-a-sinus-wave or substantially half-circular.
  • the plane sheets 26a, 26b, 26c etc. are provided with micro-slits 10.
  • the sinus-wave shaped sheets 20a, 20b, 20c etc. may be provided with micro-slits.
  • the valleys and ridges of the first and second sheets 20a, 20b in a mirror shaped manner, such that the valleys and ridges sinus-waves can be connected to the plane sheet simultaneously, e.g. by spot or line welding.
  • Fig. 5 If the configuration of Fig. 5 is used without plane sheets between the sinus- wave shaped, while connecting the valleys directly to the ridges of neighbouring sinus- wave sheets, the cross-section of the cells will instead be lemon-shaped (or substantially circular or oval).
  • FIG. 1 shows another variant of the cells 12, according to which a plurality of first corrugated sheets 20d are shaped with plane ridges 22 and sharp valleys 24, while a plurality of second corrugated sheet 20d is mirror shaped, i.e.
  • a plane sheet may be put between the corrugated sheets.
  • the cells 12 shown in Figs. 1 - 7 are all cylindrical, i.e. the cross-section in the elongation of the cell 12 from the first open end 14 to the second open end 16 is constant.
  • Figs 8A-8C are shown an alternative configuration of the cells with varying cross- section.
  • each cell 12 has a waist 30 or a time- glass shape.
  • the cell 12 has a first cross-section 18'.
  • the cross- section narrows to about the middle of the elongation of the cell 12, and then widens towards the second open end 16 to a second cross-section 18".
  • the first cross-section 18' is substantially the same as the second cross-section 18", and the waist 30 is
  • the waist 30 may be positioned closer to the first open end 14 or to the second open end 16.
  • the first cross-section 18' may be larger than the second cross- section 18" and vice versa.
  • the cross-section 18 may instead be frusto-conical 32, i.e. the cross- section is circular, the diameter of which varying continuously from the first open end 14 to the second open end 16.
  • the first cross-section 18' at the first open end 14 is larger than the second cross-section 18" at the second end 16, or vice versa.
  • the first and the second layers 4, 6 are connected to the intermediate layers shown in figures 2-7 and 8A-8C in the manner shown in Figure 1, i.e. such that it covers the open ends 14, 16 of the cells 12.
  • This is of great importance when manufacturing the micro-slits, since the absorber may collapse during machining if the intermediate layer is not stable enough.
  • a cut-out of the first layer 4 is shown.
  • the micro-slits 10 have a width a and are arranged parallel to and at a distance b from one another, and as shown in Fig. 10, the micro-slits have a length L.
  • Fig. 10 furthermore shows the manufacture of micro-slits in a sound-absorbent 2.
  • a robot 50 controlled by a micro-computer 52 is programmed to control the movements of a robot arm 54.
  • a tool holder 56 is provided with an exchangeable cutting tool 58, such as a cutting blade or a knife.
  • the tool as such may be oscillating, such as a jigsaw, or rotating, such as a circular saw or an end mill.
  • the tool may be a punch knife. In both cases, the robot only needs another programming of the computer.
  • the computer 52 of the robot 50 is programmed such that it will control the robot arm to perform longitudinal movements and cut slits at a distance b from one another, such that neighbouring slits 10 are cut at a distance b within a range of 1 micrometer to 10 mm, more preferably 10 micrometer to 5 mm, most preferably 0,5 - 2 mm.
  • the computer 52 is furthermore programmed to control the robot arm to cut said slits to a length L within the range of 2 - 2000 mm, more preferably 10 - 1000 mm, most preferably 100 - 1000 mm.
  • a plurality of aligned slits 10 may each have a length L, while together having a total length L tot which may be within the range of 4 mm up to several meters; only the size of the sound absorbent 2 sets the upper limit.
  • Figs 12A- 12 B shows a circular sound absorbent 2 with a plurality of parallel slits 10.
  • the diameter of the circular sound absorbent 2 sets the upper limit of the length of each slit L (or in case of a plurality of aligned slits (cf. Fig 11) the total length L tot ).
  • a spirally shaped single slit 10 is provided in the first layer 4.
  • the length of the slit L may be many meters.
  • the intermediate layer has been shown to have a constant thickness t c , such that first layer 4 and the second layer 6 are parallel to one another.
  • the thickness t c of the intermediate layer may instead be everything else than constant, and thus, the first layer 4 and the second layer 5 will not be parallel.
  • the intermediate layer 8 is concave 60 on the side facing the first layer 4 in such a way that the first layer 4 is caused to be concave as well, while the opposite side of the intermediate layer 8 is plane, and hence also the second layer 6 is plane.
  • the intermediate layer 8 is concave 60 also on the side facing the second layer 4, and thus, the first and second layers 4, 6 are both concave 60.
  • the intermediate layer 8 is instead convex 62 on the side facing the first layer 4 in such a way that the first layer 4 is caused to be convex 62 as well, while the opposite side of the intermediate layer 8 is plane, and hence also the second layer 6 is plane.
  • the intermediate layer 8 is convex 62 also on the side facing the second layer 6, and thus, the first and second layers 4, 6 are both convex 62.
  • the intermediate layer 8 is concave 60 on the side facing the first layer 4 in such a way that the first layer 4 is caused to be concave 60 as well, while the opposite side of the intermediate layer 8 is convex 62, and hence also the second layer 6 is convex 62.
  • Another concave-convex shape is shown in Fig. 17.
  • Fig 13F shows a different configuration of the sound absorbent 2, wherein the intermediate layer has a double sloping side facing the first layer 4, such that also the first layer is double sloping, wile the opposite side of the intermediate layer facing the second layer 6 is plane.
  • the side of the intermediate layer 8 facing the second layer 6 may be double sloping.
  • the cells 12 of the intermediate layer 8 has been shown to have a length corresponding to the core thickness t c of the intermediate layer 8.
  • the cells 12 may instead be inclined with respect to a normal to the layers 4 and 6.
  • the angle a may be in the range 0° - 30°.
  • Fig 15 shows rectangular sound absorbents 2 attached to a ceiling by fastening means 72 hanging from a ceiling.
  • the first layer 4 is provided with micro-slits 10, but also the second layer 6.
  • the elongated slits may be provided diagonally to edges of the rectangular sound absorbent.
  • all the above shown variants of sound absorbers 2 may be provided with slits arranged at an angle to and in the plane of the first (or second) layer.
  • Fig. 16 shows a sound absorbent 2 with a pattern of micro-slits 10 that also have an aesthetic effect.
  • Fig 17 shows a room provided with different kinds of sound absorbents 2 provided with micro-slits 10 on the first as well as the second layer 4, 6, and furthermore supported by stands 80; this kind of sound absorbent 2 is suitable for example in open plan offices.
  • Fig 17 also shows sound absorbents 2 in the form of pieces of art 82, 84, where the pattern of the micro-slits as such have an aesthetic effect in item 82 (the surface preferably having a uniform colour, such as white, to emphasize the pattern of the micro-slits), whereas in item 84, an image is provided on the surface of the first layer 4, and micro-slits are provided in the image.
  • the micro-slits 10 will in this case be more or less invisible, depending on the character and colouring of the image.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Acoustics & Sound (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)

Abstract

La présente invention concerne un absorbant phonique comprenant une première couche de couverture (4), une deuxième couche de couverture (6) et une couche intermédiaire (8), ladite couche intermédiaire (8) comprenant des parois (13) délimitant une pluralité de cellules (12,12a,12b,12c,12d) ouvertes à une première extrémité (14) et à une seconde extrémité (16), ces cellules étant disposées adjacentes les unes aux autres, la première extrémité ouverte (14) de la pluralité de cellules étant recouverte par la première couche de couverture (4), la seconde extrémité ouverte (16) de la pluralité de cellules étant recouverte par la deuxième couche de couverture (6). Selon l'invention, la première couche (4) est pourvue d'au moins une micro-fente (10) formée par usinage mécanique, la micro-fente (10) s'étendant dans la première couche (4) de sorte que les ondes sonores puissent pénétrer dans la micro-fente (10), ainsi que dans la première extrémité ouverte (14) de ladite cellule.
EP13711565.5A 2012-02-23 2013-02-22 Absorbant phonique Ceased EP2817799A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE13711565.5T DE13711565T1 (de) 2012-02-23 2013-02-22 Schallabsorber

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1200115 2012-02-23
SE1200253A SE536860C2 (sv) 2012-02-23 2012-04-26 En ljudabsorbent
PCT/EP2013/000517 WO2013124069A2 (fr) 2012-02-23 2013-02-22 Absorbant phonique

Publications (1)

Publication Number Publication Date
EP2817799A2 true EP2817799A2 (fr) 2014-12-31

Family

ID=47988876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13711565.5A Ceased EP2817799A2 (fr) 2012-02-23 2013-02-22 Absorbant phonique

Country Status (4)

Country Link
EP (1) EP2817799A2 (fr)
DE (1) DE13711565T1 (fr)
SE (1) SE536860C2 (fr)
WO (1) WO2013124069A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO337032B1 (no) * 2014-04-29 2016-01-04 Deamp As Lydabsorberende film
PL3242293T3 (pl) 2016-05-04 2019-05-31 Sontech Int Ab Urządzenie tłumiące dźwięk dla przewodu lub komory
US11207863B2 (en) 2018-12-12 2021-12-28 Owens Corning Intellectual Capital, Llc Acoustic insulator
US11666199B2 (en) 2018-12-12 2023-06-06 Owens Corning Intellectual Capital, Llc Appliance with cellulose-based insulator
BE1027517B1 (nl) * 2019-08-23 2021-03-23 Van Eycken Metal Construction Bvba Geluidsschermen en methode om deze te maken

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004043688A1 (fr) * 2002-11-12 2004-05-27 Wellplast Ab Produit ondule
US20100313515A1 (en) * 2007-11-03 2010-12-16 Lothar Betz Composite cellulose element

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US291080A (en) 1884-01-01 peentice
US3275101A (en) * 1963-12-16 1966-09-27 James G Milne Jr Acoustic structural unit
DE2112393A1 (de) * 1970-03-13 1971-10-28 Rolls Royce Schalldaempfungsauskleidung,insbesondere fuer Gasturbinenstrahltriebwerke
US3821999A (en) * 1972-09-05 1974-07-02 Mc Donnell Douglas Corp Acoustic liner
US3948346A (en) * 1974-04-02 1976-04-06 Mcdonnell Douglas Corporation Multi-layered acoustic liner
DE2438987A1 (de) * 1974-08-14 1976-02-26 Helmut Dr Schmidt Schallabsorbierende mehrschichtplatte
US4291080A (en) * 1980-03-31 1981-09-22 Vought Corporation Sound attenuating structural panel
US4479992A (en) 1981-05-28 1984-10-30 Matec Holding Ag Sound absorbing structural element
DE3401312A1 (de) * 1984-01-17 1985-07-18 Karl Danzer KG, 7640 Kehl Schallschluckende roehrenspanplatte
US4850093A (en) 1987-02-09 1989-07-25 Grumman Aerospace Corporation Method of making an acoustic attenuating liner
JP3330809B2 (ja) * 1996-01-17 2002-09-30 昭和飛行機工業株式会社 曲面ハニカムパネルの製造方法
SE506188C2 (sv) 1996-01-25 1997-11-17 Dale Edward Knipstein Ljudabsorberande element samt förfarande för framställning av detta element samt användning av elementet
ES2177513T3 (es) * 1999-05-06 2002-12-16 Faist Automotive Gmbh & Co Kg Elemento de insonorizacion, utilizacion del mismo y procedimiento parasu fabricacion.
DE102005019433B4 (de) 2005-04-25 2008-08-28 Richter Furniertechnik Gmbh & Co. Kg Leichtbauplatte mit beiderseitiger Beplankung
WO2007149535A1 (fr) * 2006-06-21 2007-12-27 Ben Strauss Nid d'abeille doté d'une fraction de parois cellulaires sensiblement poreuses
DK1950357T3 (da) * 2007-01-29 2010-11-01 Albers & Co Akustikelementer
CH700728B1 (de) * 2007-07-13 2010-10-15 Albers & Co Akustikelemente.
DK2283190T3 (da) * 2008-03-28 2021-02-08 Noble Environmental Tech Corporation Konstruerede formede fiberpladepaneler, fremgangsmåder til fremstilling af panelerne, og produkter fremstillet fra panelerne
GB2486120B (en) 2010-03-02 2012-10-31 Gkn Aerospace Services Ltd Seamless acoustic liner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004043688A1 (fr) * 2002-11-12 2004-05-27 Wellplast Ab Produit ondule
US20100313515A1 (en) * 2007-11-03 2010-12-16 Lothar Betz Composite cellulose element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2013124069A2 *

Also Published As

Publication number Publication date
WO2013124069A2 (fr) 2013-08-29
WO2013124069A3 (fr) 2013-11-14
SE1200253A1 (sv) 2013-08-24
SE536860C2 (sv) 2014-10-07
DE13711565T1 (de) 2015-06-03

Similar Documents

Publication Publication Date Title
WO2013124069A2 (fr) Absorbant phonique
US5997985A (en) Method of forming acoustic attenuation chambers using laser processing of multi-layered polymer films
US6334280B1 (en) Sound absorbing cementitious tile
CN107645985B (zh) 具有分级多孔结构的蜂窝芯体
AU723237B2 (en) Soundabsorbing element and procedure for manufacturing of this element and use of this element
KR100516376B1 (ko) 표면 장력이 완화된 장착 재료
EP2937483A1 (fr) Panneau de construction, en particulier dalle de plafond ou murale
GB2148184A (en) Sound absorbing board structure
EP2841660A1 (fr) Élément d'absorption acoustique
JP5318513B2 (ja) 複層吸音材
WO2014123945A2 (fr) Absorbeur à gaze acoustique de faible poids amélioré
JPH0418600A (ja) 吸音材およびその製造方法
JP5579873B2 (ja) 穿孔装置、被穿孔物
CN201111890Y (zh) 一种微穿孔吸声材料
EP2579248A2 (fr) Procédé de fabrication d'une plaque d'insonorisation à deux ou trois couches et plaque d'insonorisation associée
JP6182251B1 (ja) キッチンペーパー
CA2538179A1 (fr) Procede de reliure sans couture et dispositif de mise en oeuvre dudit procede
EP1358023B9 (fr) Procede de fabrication une structure en nid d'abeilles a rabats
JP2004536973A5 (fr)
SE536860C3 (fr)
AU2010233057A1 (en) An acoustic panel and a method of manufacturing acoustic panels
TWI359707B (fr)
JP6990939B2 (ja) 樹脂構造体
JP5323465B2 (ja) 吸音板および該吸音板の製造方法
JP2000246818A (ja) ハニカム用シートの製造法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20140829

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
REG Reference to a national code

Ref country code: DE

Ref legal event code: R210

Effective date: 20150603

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20190102

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NOISETECH KB

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20230529