GB2324760A - Acoustic composite material - Google Patents

Acoustic composite material Download PDF

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Publication number
GB2324760A
GB2324760A GB9708567A GB9708567A GB2324760A GB 2324760 A GB2324760 A GB 2324760A GB 9708567 A GB9708567 A GB 9708567A GB 9708567 A GB9708567 A GB 9708567A GB 2324760 A GB2324760 A GB 2324760A
Authority
GB
United Kingdom
Prior art keywords
acoustic
composite material
barrier layer
blanket
material according
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Withdrawn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
GB9708567A
Other versions
GB9708567D0 (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.)
NOISCO PRODUCTS Ltd
Original Assignee
NOISCO PRODUCTS Ltd
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 NOISCO PRODUCTS Ltd filed Critical NOISCO PRODUCTS Ltd
Priority to GB9708567A priority Critical patent/GB2324760A/en
Publication of GB9708567D0 publication Critical patent/GB9708567D0/en
Publication of GB2324760A publication Critical patent/GB2324760A/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • 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
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • 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
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester 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
    • 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
    • B32B2311/14—Lead
    • 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
    • B32B2327/00—Polyvinylhalogenides
    • B32B2327/06—PVC, i.e. polyvinylchloride

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

An acoustic composite material comprises a fibrous blanket layer (1) having adhesively bonded to it an acoustic barrier layer (8) to which is adhesively bonded a protective layer (5). The layers (5) and (8) together constitute a vapour barrier. A scrim (7) of glass fibre may be interposed between the layers (5) and (8). Alternatively two layers (10,12) of blanket material are adhesively bonded to form a sandwich with an acoustic barrier layer (14) therebetween. At least one layer of the fibrous blanket material is covered with a vapour barrier material (16,18). The acoustic barrier layer may be a filled polymeric material or lead. The protective material may be metallic foil. In the alternative embodiment the vapour barrier layer may be of PVC coated glass cloth, silicon coated polymeric material or metallic foil.

Description

Acoustic Composite Material This invention relates to an acoustic composite material and a method of manufacturing said material.
Known from U.K. Patent Specification No. 2 261 846 is an acoustic composite material using a quilted pad of glass or mineral fibres and which, together with a reflective layer and an intermediate acoustic barrier layer, are bonded together using heat and pressure.
The aim of the present invention is to provide a simpler, equally efficient acoustic composite material, in two forms both of which can be more easily and less expensively manufactured.
According to one aspect of the present invention, there is provided an acoustic composite material comprising a fibrous blanket, a protective layer adhesively overlying one face of the blanket and an acoustic barrier layer interposed between the protective layer and the blanket, the protective layer and the acoustic barrier layer being bonded together to constitute a vapour barrier, and this vapour barrier layer being adhesively bonded to the blanket. The material in accordance with this aspect of the invention is especially suitable as a lagging material.
According to a second aspect of the invention, the said acoustic layer and protective layer are adhesively bonded together to form a vapour barrier layer and the latter is adhesively bonded to the fibrous blanket.
According to still another aspect of the present invention, there is provided an acoustic composite material comprising two layers of fibrous blanket having sandwiched between them an acoustic barrier layer and on the face of at least one of the layers of fibrous blanket a sheet material constituting a vapour barrier.
This material is suitable for use as an acoustic absorber and barrier.
In both aspects, the fibrous blanket is preferably made of polyester fibres first spun and then matted under heat and pressure, as by means of heated rollers, to form a non-delaminating pad. Quilting with the aid of facing scrims is thereby rendered unnecessary. Moreover, in accordance with the invention, layers to be bonded together can be so bonded adhesively, as by means of a spray adhesive.
A suitable, finished blanket material is commercially available under the Trade Mark "Fiberform".
In the first embodiment, a suitable protective layer may be made from metallic (aluminium) foil of between 2 and 150 microns, preferably about 20 microns, thickness, but any material having vapour barrier, wear and fire retardance properties may be used instead. For example, a PVC coated scrim (e.g. 50 to 300 g/m2) may be used to reinforce the metallic foil.
Conveniently, in the first embodiment, the acoustic barrier layer may be a polymeric material, for example a chlorinated polyethylene based material, with a surface density between 1 and 15 kg/m2. This layer may be loaded with a high density filler such as barium sulphate. The acoustic barrier layer may instead be made of a PVC based material or a material based on ethylene vinyl acetate.
In the second embodiment, a similar acoustic barrier layer may be employed as in the first embodiment, but alternatively a lead or polymeric layer may be used.
The vapour barrier layer made be of PVC coated glass cloth.
Reverting to the fibrous blanket, in the first embodiment this may have a thickness in the range 5 to 40 mm, and a volume density in the range 5 to 30 kg/m3. In the second embodiment, two layers of thickness each in the range 5 to 25 mm may be used.
Unlike the method of manufacture described in U.K. Patent Specification No. 2 261 846, it is unnecessary to employ a heated press to bond layers together in either the first or second aspects of the invention.
The invention is further described with reference to the accompanying drawings, in which: Figure 1 shows a first example of the acoustic composite material; and Figure 2 shows a second example.
This material shown in Figure 1 comprises a polyester fibre blanket 1, typically a blanket of the material known by the Trade Mark "Fiberform". It may conveniently be about 20 mm thick.
Bonded by spray adhesive to the fibrous blanket 1 is a vapour barrier layer constituted by a protective layer 5 and an acoustic barrier layer 8. The protective layer 5 is constituted by a 2 mm thick aluminium foil 6 and the acoustic barrier 8 is constituted by 3 mm thickness chlorinated polyethylene with a surface density of between 2 and 15 kg/m2, loaded with barium sulphate.
The layers 5 and 8 may be bonded together via a scrim 7 of 6 mm square pattern glass fibres, and the resulting vapour barrier layer is then bonded to the fibrous blanket, also by spray adhesive.
In the embodiment of Figure 2, two layers 10, 12 of the blanket material, e.g.
Fiberform (Trade Mark), say about 10 mm thick, are adhesively bonded to form a sandwich with an acoustic barrier layer 14 between them. The layer 14 may be of lead, PVC, EVA or EPDM having a surface density in the range 3 kg/m2 to 20 kg/m2.
At least one layer of the fibrous blanket material, both as illustrated, is covered with a vapour barrier layer 16, 18, for example of PVC coated glass cloth, silicon coated polymeric material or possibly aluminium foil.
The resulting acoustic composite material is at least as efficient, as far as transmission loss is concerned, as the product known from U.K. Patent Specification No. 2 261 846, but is of simpler construction and is easier and less expensive to manufacture. Unlike glass or mineral fibre material, the polyester blanket material used in this invention does not non-elastically compress or break down when squashed, and is more user friendly.

Claims (17)

Claims
1. An acoustic composite material comprising a fibrous blanket, a protective layer adhesively overlying one face of the blanket and an acoustic barrier layer interposed between the protective layer and the blanket, the protective layer and the acoustic barrier layer being bonded together to constitute a vapour barrier, and the vapour barrier layer being adhesively bonded to the blanket.
2. An acoustic composite material according to claim 1, wherein the acoustic barrier layer is adhesively bonded to the fibrous blanket.
3. An acoustic composite material comprising two layers of fibrous blanket having sandwiched between them an acoustic barrier layer and on the face of at least one of the layers of fibrous blanket a sheet material constituting a vapour barrier.
4. An acoustic composite material according to any of claims 1 to 3, wherein the fibrous blanket is made of polyester fibres first spun and then matted under heat and pressure, as by means of heated rollers, to form a non-delaminating pad.
5. An acoustic composite material according to claim 4, wherein the blanket material is that known by the Trade Mark *Fiberform".
6. An acoustic composite material according to claim l or claim 2, wherein the protective layer is made from metallic (aluminium) foil of between 2 and 150 microns, preferably about 20 microns, thickness.
7. An acoustic composite material according to claim 6, wherein a PVC coated scrim (e.g. 50 to 300 g/m2) is used to reinforce the metallic foil.
8. An acoustic composite material according to claim 1 or claim 2, wherein the acoustic barrier layer is a polymeric material, for example a chlorinated polyethylene based material, with a surface density between 1 and 15 kg/m2.
9. An acoustic composite material according to claim 8, in which the polymeric material is loaded with a high density filler such as barium sulphate.
10. An acoustic composite material according to claim 1 or claim 2, wherein the acoustic barrier layer is made of a PVC based material or a material based on ethylene vinyl acetate.
11. An acoustic composite material according to claim 3, wherein the acoustic barrier layer is a polymeric material, for example a chlorinated polyethylene based material, with a surface density between 1 and 15 kg/m2.
12. An acoustic composite material according to claim 11, wherein the polymeric material is loaded with a high density filler such as barium sulphate.
13. An acoustic composite material acording to claim 11, wherein the acoustic barrier layer is made of lead.
14. An acoustic composite material according to any of claims 11 to 13, wherein the vapour barrier layer is made of PVC coated glass cloth.
15. An acoustic composite material according to claim 1 or claim 2, wherein the fibrous blanket has a thickness in the range 5 to 40 mm, and a volume density in the range 5 to 30 kg/m3.
16. An acoustic composite material according to claim 3, wherein two layers of thickness each in the range 5 to 25 mm are employed as the blanket layer.
17. An acoustic composite material substantially as hereinbefore described with reference to Figure 1 or Figure 2 of the accompanying drawings.
GB9708567A 1997-04-29 1997-04-29 Acoustic composite material Withdrawn GB2324760A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9708567A GB2324760A (en) 1997-04-29 1997-04-29 Acoustic composite material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9708567A GB2324760A (en) 1997-04-29 1997-04-29 Acoustic composite material

Publications (2)

Publication Number Publication Date
GB9708567D0 GB9708567D0 (en) 1997-06-18
GB2324760A true GB2324760A (en) 1998-11-04

Family

ID=10811462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9708567A Withdrawn GB2324760A (en) 1997-04-29 1997-04-29 Acoustic composite material

Country Status (1)

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GB (1) GB2324760A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
EP1458556A1 (en) * 2001-08-06 2004-09-22 Federal-Mogul Powertrain, Inc. Thermally insulative sleeve
EP3007164A3 (en) * 2014-08-18 2016-08-03 Hamilton Sundstrand Corporation Noise abatement for aircraft components and systems in aircraft bays

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146289A (en) * 1983-08-26 1985-04-17 Sound Attenuators Ltd Improved acoustic attenuating material and method for making the same
GB2200591A (en) * 1987-01-30 1988-08-10 Salex Acoustic Materials Limit Improved acoustic attenuating material
GB2261846A (en) * 1991-11-27 1993-06-02 Salex Acoustic Materials Limit Acoustic composite material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146289A (en) * 1983-08-26 1985-04-17 Sound Attenuators Ltd Improved acoustic attenuating material and method for making the same
GB2200591A (en) * 1987-01-30 1988-08-10 Salex Acoustic Materials Limit Improved acoustic attenuating material
GB2261846A (en) * 1991-11-27 1993-06-02 Salex Acoustic Materials Limit Acoustic composite material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1458556A1 (en) * 2001-08-06 2004-09-22 Federal-Mogul Powertrain, Inc. Thermally insulative sleeve
EP1458556A4 (en) * 2001-08-06 2009-08-26 Federal Mogul Powertrain Inc Thermally insulative sleeve
EP2405174A1 (en) * 2001-08-06 2012-01-11 Federal-Mogul Powertrain, Inc. Thermally insulative sleeve
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
EP3007164A3 (en) * 2014-08-18 2016-08-03 Hamilton Sundstrand Corporation Noise abatement for aircraft components and systems in aircraft bays

Also Published As

Publication number Publication date
GB9708567D0 (en) 1997-06-18

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)