GB2261846A - Acoustic composite material - Google Patents

Acoustic composite material Download PDF

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Publication number
GB2261846A
GB2261846A GB9224319A GB9224319A GB2261846A GB 2261846 A GB2261846 A GB 2261846A GB 9224319 A GB9224319 A GB 9224319A GB 9224319 A GB9224319 A GB 9224319A GB 2261846 A GB2261846 A GB 2261846A
Authority
GB
United Kingdom
Prior art keywords
material according
pad
reflective layer
barrier layer
scrim
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.)
Withdrawn
Application number
GB9224319A
Other versions
GB9224319D0 (en
Inventor
Alan John Franks
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.)
SALEX ACOUSTIC MATERIALS LIMIT
Original Assignee
SALEX ACOUSTIC MATERIALS LIMIT
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 SALEX ACOUSTIC MATERIALS LIMIT filed Critical SALEX ACOUSTIC MATERIALS LIMIT
Publication of GB9224319D0 publication Critical patent/GB9224319D0/en
Publication of GB2261846A publication Critical patent/GB2261846A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
    • F16F9/306—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium of the constrained layer type, i.e. comprising one or more constrained viscoelastic layers
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • 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
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2327/00—Polyvinylhalogenides
    • B32B2327/06—PVC, i.e. polyvinylchloride

Abstract

An acoustic composite material comprises a sandwich of a reflective layer (5), an acoustic barrier layer (8) and a quilted pad (1) of glass or mineral fibre material bonded together by the application of heat and pressure. The pad is faced with layers of porous scrim (2), (3). The reflective layer, for example aluminium foil may be reinforced with a scrim (7). <IMAGE>

Description

ImDrovements in Acoustic Materials This invention relates to an improved acoustic composite material and to a method of producing the same.
Acoustic composite materials based on a quilted pad of glass- or mineral-fibres are known and it is also known to provide moisture-impermeable barriers on one or both sides of the pad and to provide at least one acoustically dense barrier in the composite material.
This invention relates to an improved acoustic composite material of this general type which is simpler and safer to manufacture than known composite materials of equivalent acoustic performance.
In its material aspect, the invention relates to a pad of non-woven glass- or mineral-fibres with first and second layers of porous scrim facing opposite sides of the pad and with quilting stitches bonding the pad and facing layers together, a reflective layer overlying one of the facing layers and an acoustic barrier layer of thermoplastic material interposed between the reflective layer and said one facing layer and bonding the reflective layer to the quilted pad, said reflective layer and acoustic barrier layer together providing a vapour barrier layer.
Suitably the reflective layer is an aluminium foil of between 2 and 150 microns thickness which is reinforced with a scrim of non-combustible fibres and is bonded thereto with a film of thermoplastic material to form an outer protective vapour barrier. A typical thickness for the aluminium foil would be 20 microns and a typical scrim bonded thereto would be made from glass fibre strands laid in a 6mm square pattern. A polyethylene film (eg. of 25g/m2) makes a suitable foil/scrim bonding medium. Alternatively a PVC coated scrim (eg. in a weight range 50 to 300g/m2) can be used to reinforce a metallic foil and form the outer reflective layer.
Conveniently the acoustic barrier layer is a polymeric material (typically a chlorinated polyethylene based thermoplastic material) with a surface density between 1 and 15 kg/m2. The acoustic barrier layer may be loaded with a high density filler (eg. barium sulphate). Other suitable materials are polyvinyl chloride and ethylene vinyl acetate.
The quilted pad suitably has, prior to quilting, an uncompressed thickness in the range of 15 to 30 mm and a volume density in the range of 12 to 25 kg/m3. A glass fibre pad of a nominal thickness of 20mm and a volume density of 16 kg/m3 is a very convenient material. The facing layers are conveniently the same on both sides of the pad but this is not essential since one facing layer becomes embedded in the barrier layer while the other forms the exposed surface of the composite and these different end situations can lead to different choices for an optimum material for each facing layer. Woven or non-woven glassor mineral-fibre cloths are preferred for the facing layers and the quilting operation secures the facing layers and pad firmly together.Machine sewn quilting is preferred and although the quilt pattern is not critical a 10cm square pattern inclined at 45 to the long edge of the pad has been found to be ideal.
An important feature of the invention is the use of heat and pressure to bond the components together via some degree of fusion of the acoustic barrier layer.
Thus in its method aspects, the invention relates to assembling a sandwich of the reflective layer, the acoustic barrier layer and the quilted pad in a heated press and applying heat and pressure to form a unified composite therefrom.
Suitably spacers are used to control the minimum approach distance of the platens of the press during the thermal bonding treatment. A typical spacing would be 10mm in the case of an uncompressed sandwich thickness of around 20mm.
Pressures of 6 to 18 tonnes per m2 would be typical and residence times of 1 to 5 minutes would cover most situations. The optimum temperature clearly depends on the nature of the acoustic barrier layer and on the residence time but with a chlorinated polyethylene having both platens in the temperature range 125-C to 175-C has proved satisfactory for most situations.
On removal from the heated press, the composite can easily be trimmed to the sizes required.
Preferably the heat/pressure treatment is sufficient to leave a pattern of the quilting exposed on the reflective layer.
The accompanying drawing shows one example of an acoustic composite in accordance with this invention.
In the drawing, 1 indicates a 20mm thick pad of glass fibres having a surface density of 400 g/m2 and faced on each side with layers of scrim 2 and 3 which can be manufactured from non-woven synthetic fabric or woven glass cloth. The components 1, 2 and 3 are quilted together using thread on a 10cm square pattern the thickness of the pad being reduced to 4mm where quilt stitches occur.
The outer facing of the composite is a non-combustible reflective layer 5 formed from a 0.2mm thick aluminium foil 6 bonded to a scrim 7 of a 6sm square pattern of glass fibres.
A barrier layer 8 consists of a 3mm thickness of chlorinated polyethylene with a surface density of between 2 and 15 kg/m2 loaded with barium sulphate.
Following 4 minutes pressure treatment at 6 to 18 tonnes per m2 in a two platen press with the upper platen in contact with the reflective layer 5 at 125-C, the lower platen also heated to 125 CC and the platens held at a spacing of 10mm - a fully bonded composite is produced in which the reflective surface shows both the pattern of the quilting and of the scrim 7.
By increasing the temperature of the upper and lower platens to 175-C, the residence time can be reduced to 2 minutes and produce a fully bonded composite which is at least as good as that produced with the longer residence time but lower temperature platens.
The performance of the material produced with this new method is comparable to material manufactured with traditional methods using lead, and the actual performance can be better than that of prior art material depending on the weight of the barrier material used.
Conclusion The advantages that result from the process described above over the conventional spray adhesive bonded laminates are: 1. Heat bonding gives a high strength composite laminate.
2. The invention gives a far more economical method of production.
3. The product maintains the levels of transmission loss of the existing product range but is simpler to manufacture at a reduced material content level.
4. As no solvent-based adhesives are used, the process offers improvements in potential working conditions from a Health and Safety viewpoint and does not emit toxic fume concentrations during manufacture.

Claims (27)

1. An acoustic composite material comprising a pad of non-woven glass- or mineral-fibres with first and second layers of porous scrim facing opposite sides of the pad and with quilting stitches bonding the pad and facing layers together, a reflective layer overlying one of the facing layers and an acoustic barrier layer of thermoplastic material interposed between the reflective layer and said one facing layer and bonding the reflective layer to the quilted pad, said reflective layer and acoustic barrier layer together providing a vapour barrier layer.
2. Material according to claim 1, in which the reflective layer is an aluminium foil of between 2 and 150 microns thickness which is reinforced with a scrim of noncombustible fibres and is bonded thereto with a film of thermoplastic material.
3. Material according to claim 2, in which the thickness of the aluminium foil is 20 microns.
4. Material according to claim 2 or claim 3, in which the scrim is made from glass fibre strands.
5. Material according to claim 4, in which the strands are laid in a 6 mm square pattern.
6. Material according to any one preceding claim, in which a polyethylene film is used as the foil/scrim bonding medium.
7. Material according to claim 6, in which the polyethylene film has a surface density of 25 g/m2.
8. Material according to any one of claims 1 to 5, in which a PVC coated scrim is used to reinforce the reflective layer.
9. Material according to claim 8, in which the PVC coated scrim has a surface density in the range 50 to 300 g/m2.
10. Material according to any preceding claim, in which the acoustic barrier layer is a polymeric material loaded with a high density filler to have a surface density between 1 and 15 kg/m2.
11. Material according to claim 10, in which the polymeric material is a chlorinated polyethylene-, a polyvinyl chloride- or an ethylene vinyl acetate-based thermoplastic material.
12. Material according to claim 10 or claim 11, in which the high density filler is barium sulphate.
13. Material according to any one preceding claim, having a volume density in the range 12 to 25 kg/m3.
14. Material according to claim 13, in which the volume density is about 16 kg/m3.
15. Material according to any one preceding claim, in which the facing layers are the same on both sides of the pad.
16. Material according to claim 15, in which the facing layers are secured to the pad by machine sewn quilting.
17. Material according to claim 16, in which the quilt pattern is a square pattern inclined to one edge of the pad.
18. Material according to claim 17, in which the quilt pattern is based on 10 cm squares.
19. Material according to any preceding claim, in which the facing layers are of woven or non-woven glass- or mineral-fibre cloths.
20. Material according to any one preceding claim, in which a pattern of the quilting is exposed on the reflective layer.
21. An acoustic composite material substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawing.
22. A method of making an acoustic composite material comprising a pad of non-woven glass- or mineral-fibres with first and second layers of porous scrim facing opposite sides of the pad and with quilting stitches bonding the pad and facing layers together, a reflective layer overlying one of the facing layers and an acoustic barrier layer of thermoplastic material interposed between the reflective layer and said one facing layer and bonding the reflective layer to the quilted pad, said reflective layer and acoustic barrier layer together providing a vapour barrier layer, wherein heat and pressure are used to bond the components together via some degree of fusion of the acoustic barrier layer.
23. A method according to claim 22, in which a sandwich comprising the reflective layer, the acoustic barrier layer and the quilted pad is assembled and located between platens of a heated press and heat and pressure are applied thereto to form a unified composite material therefrom.
24. A method according to claim 23, in which pressures of 6 to 18 tonnes per m2 and residence times of 1 to 5 minutes are used.
25. A method according to claim 24, in which a platen temperature of 125it is used for a residence time of 4 minutes.
26. A method according to claim 23, in which the sandwich comprises a 20 mm thick pad, and a 3mm thick acoustic barrier layer and is heat treated between platens spaced 10 mm apart.
27. A method according to any one of claims 22 to 26, in which the heat/pressure treatment is sufficient to leave a pattern of the quilting exposed on the reflective layer.
GB9224319A 1991-11-27 1992-11-20 Acoustic composite material Withdrawn GB2261846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB919125205A GB9125205D0 (en) 1991-11-27 1991-11-27 Improvements in acoustic materials

Publications (2)

Publication Number Publication Date
GB9224319D0 GB9224319D0 (en) 1993-01-13
GB2261846A true GB2261846A (en) 1993-06-02

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Family Applications (2)

Application Number Title Priority Date Filing Date
GB919125205A Pending GB9125205D0 (en) 1991-11-27 1991-11-27 Improvements in acoustic materials
GB9224319A Withdrawn GB2261846A (en) 1991-11-27 1992-11-20 Acoustic composite material

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB919125205A Pending GB9125205D0 (en) 1991-11-27 1991-11-27 Improvements in acoustic materials

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GB (2) GB9125205D0 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998016915A1 (en) * 1996-10-14 1998-04-23 M. Faist Gmbh & Co. Kg Device for absorbing and/or damping sound waves
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
EP0897174A1 (en) * 1997-08-13 1999-02-17 AEROSPATIALE Société Nationale Industrielle Acoustically resistive layer, manufacturing process for this layer and sound-absorbing panel featuring at least one such layer as well as its manufacturing process
FR2779166A1 (en) * 1998-05-27 1999-12-03 Rockwool Isolation Sa THERMALLY INSULATING AND ACOUSTICALLY ABSORBING ROOF
WO2003049944A1 (en) * 2001-12-13 2003-06-19 Da Costa Sales Vanderlei Fezen Process of getting absorber/insulator acoustic blanket for automotive vehicles
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
WO2003095267A2 (en) * 2002-05-08 2003-11-20 Johnson Controls Technology Company Sound absorbing panel for a vehicle and its method of manufacture
WO2008006415A2 (en) * 2006-07-12 2008-01-17 Frenzelit-Werke Gmbh & Co. Kg Sliding element in the form of an acoustic cushion for soundproofing power turbines
US11220614B2 (en) * 2017-05-10 2022-01-11 Regenesis Bioremediation Products Metal-based membranes for vapor intrusion mitigation

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998016915A1 (en) * 1996-10-14 1998-04-23 M. Faist Gmbh & Co. Kg Device for absorbing and/or damping sound waves
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
US6268038B1 (en) 1997-08-13 2001-07-31 Aerospatiale Societe Nationale Industrielle Acoustically resistive layer, process for production of this layer and absorbent acoustic panel provided with at least one such layer, as well as its process for production
FR2767411A1 (en) * 1997-08-13 1999-02-19 Aerospatiale ACOUSTICALLY RESISTIVE LAYER, METHOD FOR MANUFACTURING THE SAME AND ACOUSTICALLY ABSORBING PANEL PROVIDED WITH AT LEAST ONE SUCH LAYER
EP0897174A1 (en) * 1997-08-13 1999-02-17 AEROSPATIALE Société Nationale Industrielle Acoustically resistive layer, manufacturing process for this layer and sound-absorbing panel featuring at least one such layer as well as its manufacturing process
FR2779166A1 (en) * 1998-05-27 1999-12-03 Rockwool Isolation Sa THERMALLY INSULATING AND ACOUSTICALLY ABSORBING ROOF
EP0962604A1 (en) * 1998-05-27 1999-12-08 Rockwool-Isolation S.A. Thermally and acoustically insulating roof
WO2003049944A1 (en) * 2001-12-13 2003-06-19 Da Costa Sales Vanderlei Fezen Process of getting absorber/insulator acoustic blanket for automotive vehicles
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
WO2003095267A2 (en) * 2002-05-08 2003-11-20 Johnson Controls Technology Company Sound absorbing panel for a vehicle and its method of manufacture
WO2003095267A3 (en) * 2002-05-08 2004-01-15 Johnson Controls Tech Co Sound absorbing panel for a vehicle and its method of manufacture
WO2008006415A2 (en) * 2006-07-12 2008-01-17 Frenzelit-Werke Gmbh & Co. Kg Sliding element in the form of an acoustic cushion for soundproofing power turbines
WO2008006415A3 (en) * 2006-07-12 2008-04-10 Frenzelit Werke Gmbh & Co Kg Sliding element in the form of an acoustic cushion for soundproofing power turbines
US11220614B2 (en) * 2017-05-10 2022-01-11 Regenesis Bioremediation Products Metal-based membranes for vapor intrusion mitigation

Also Published As

Publication number Publication date
GB9125205D0 (en) 1992-01-29
GB9224319D0 (en) 1993-01-13

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