GB2146289A - Improved acoustic attenuating material and method for making the same - Google Patents

Improved acoustic attenuating material and method for making the same Download PDF

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Publication number
GB2146289A
GB2146289A GB08421484A GB8421484A GB2146289A GB 2146289 A GB2146289 A GB 2146289A GB 08421484 A GB08421484 A GB 08421484A GB 8421484 A GB8421484 A GB 8421484A GB 2146289 A GB2146289 A GB 2146289A
Authority
GB
United Kingdom
Prior art keywords
sheet
facing
mesh
pad
attenuating material
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.)
Granted
Application number
GB08421484A
Other versions
GB2146289B (en
GB8421484D0 (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.)
Sound Attenuators Ltd
Original Assignee
Sound Attenuators 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 Sound Attenuators Ltd filed Critical Sound Attenuators Ltd
Publication of GB8421484D0 publication Critical patent/GB8421484D0/en
Publication of GB2146289A publication Critical patent/GB2146289A/en
Application granted granted Critical
Publication of GB2146289B publication Critical patent/GB2146289B/en
Expired 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
    • 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
    • B32B5/28—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 impregnated with or embedded in a plastic substance
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Manufacturing Of Multi-Layer Textile Fabrics (AREA)

Abstract

Avoidance of liquid (e.g. oil) ingress into fibrous pad material (3) of a mesh-faced pad (5, 3) is ensured by sealing the quilting holes in the mesh facing sheet (5) formed by stitching (6) and simultaneously bonding the pad material to the mesh facing sheet (5). A cored composite can comprise two such sealed pads (2, 4: 3, 5) sandwiching an acoustically dense core sheet (1) e.g. of lead. <IMAGE>

Description

SPECIFICATION Improved acoustic attenuating material and method for making the same This invention relates to acoustic attenuating material comprising a fibrous pad and a woven facing sheet of a proofed mesh material. It is known, for example, to use a sandwich of two mesh-faced fibrous pads and an intermediate acoustically dense core sheet as a noise control composite for sound attenuating in environments where a significant fire risk exists. One example of such an environment is in the vicinity of noisy fuel-consuming engines or motors.
The traditional way of fabricating the meshfaced pad used in a cored composite described above is to proof the mesh with a suitable settable sealant and then secure the proofed mesh to the fibrous pad by stitching.
It has been noted however, that the stitching destroys the proofing at each stitch hole thereby allowing ingress of liquids through the mesh so that they can be absorbed into the pad. Absorption of liquid into the pad invariably results in a downgrading of the acoustic material and where the liquid is flammable, its ingress into the pad can represent a fire risk.
It has therefore been proposed to reproof the mesh after stitching, which although preventing liquid ingress through the stitch holes, adds a further step to the manufacturing process thus increasing the production cost.
We have now found that by a suitable choice of the mesh facing material, proofing can be effected after stitching in such wise as to not only seal the stitch holes but also to bond the pad to the facing material with the proofing composition. Since a highly effective bond between the facing material and the pad is eventually obtained by means of the proofing composition, the stitching can be viewed more in terms of a temporary tacking together of the mesh and pad rather than as a long-term securement and can be effected, for example, by conventional machine quilting using a very light-weight thread.
According to one aspect of the invention, an acoustic attenuating material comprising a fibrous pad and a facing mesh sheet attached thereto by stitching, the stitching being sealed to the facing mesh sheet, is characterised in that the pad is bonded to the facing mesh sheet in regions remote from the stitching by the composition used for sealing the stitch holes in the facing mesh sheet.
Suitably the fibrous pad is a pad of mineral fibres typically between 1 and 5 cms thick and preferably around 2 to 3 cms. thick. The density of the fibrous pad can vary considerably, but pads in the range 10 to 100 Kg/cubic metre would be typical. Pads of glass fibre in the density range 10 to 1 5 Kg/m3 would be preferred.
The facing mesh sheet is desirably of woven glass fibres having a surface weight typically in the range 70 g/sq. metre. A suitable mesh size would be around 70 to 80 threads/decimetre with a mesh thickness of around 0. 1 3 mm (0.005").
A preferred material for the facing mesh sheet is that sold under the Trade Name MARGLAS and marketed under the designation 250 K.
The stitching can be applied by machine quilting, the quilt size being non-critical (since the stitching is only a temporary tacking of the pad to the mesh) but quilting in squares of 10 cms. wide is very suitable.
The sealing of the stitch holes and bonding of the pad to the mesh sheet can be effected using a proofing composition based on polychloroprene or other film-forming hardenable compositions, or it can be effected with an adhesive layer interposed between the facing mesh sheet and a liquid impermeable outer facing sheet.
According to a further aspect of the invention, a method of fabricating an acoustic attenuating material comprising a fibrous pad faced with a mesh sheet, with stitching securing the mesh sheet to the pad, is characterised in that the pad and mesh facing sheet are machine quilted and the mesh facing sheet is treated on its non-pad faced surface subsequent to the quilting to seal the quilting stitches and bond the pad to the mesh facing sheet. The seal/bond can be effected by transmision of proofing composition through the mesh facing sheet or by adhesive used to secure a liquid-impervious outer facing sheet over the mesh facing sheet.
Since two faced pads according to the invention can be combined with a dense acoustic core sheet to produce a noise control composite which has improved properties, such a composite constitutes a further aspect of the invention.
In a noise control composite according to the invention, the core sheet can be of lead (e.g. with a surface density of between 3 and 10 Kg/sq. metre) or of a loaded pvc or eva sheet of between 2 and 5 mm thickness.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a partially sectioned view of a noise control composite using two faced pads according to the invention, and Figure 2 is part of a second form of faced pad according to the invention.
The composite shown in Fig. 1 comprises a core sheet 1 of 2.5 mm thick loaded eva sheet of surface density of around 7 Kg/sq.
metre lightly adhered to two fibre-glass pads 2 and 3.
Each pad 2, 3 has been bonded to a respective facing sheet 4, 5 by light machine quilting 6 and a proofing of polychloroprene applied to the sheets 4, 5 subsequent to the quilt stitching.
Each pad 2, 3 has an uncompressed thickness of about 1 5 mm and a surface density of 840 g per sq. metre with its facing sheet.
Each facing sheet is of MARGLAS 250 K having approximately 79 threads/decimetre in the warp direction and 75 threads/decimetre in the weft direction.
An edge binding 7 seals the edges of the composite, but it is not essential to seal the edges in this way since one of the pads and the core sheet can be cut back along a sheet edge and the other pad folded round the cut edge to butt or overlap the one pad. The folded over region of the other pad can then be edge sewn to control fibre erosion and to give the composite a neat finished appearance.
A modified composite can be created by proofing either or both of the facing sheets 4, 5 with an adhesive layer which is serving to bond a further facing layer on the outside of the or each sheet 4, 5 after the quilt stitching has been applied thereto.
Thus, for example, the component 3, 5 shown in the drawing can be made by quilting an unproofed mesh sheet 5 (e.g. of MAR GLAS 250 K) to the fibrous pad 3 and then proofing this with an outer facing sheet in the form of a close woven glass cloth which has previously been neoprene coated on one side only. The outer facing sheet can be bonded to the unproofed mesh sheet 5 using a sheet of heat-activated film adhesive.
Fig. 2 shows part of a pad made in this manner, the liquid-impermeable outer facing sheet being shown at 7 and a sheet of heat activated film adhesive at 8. When a composite is made in this method a second adhesive sheet 9 would be located between the pad 3 and the core sheet 1. Following heat treatment, the sheets 9 and 8 melt and effect secure bonding of the pad 3 to the core sheet 1 and the outer facing sheet 7 over the stitches 6 and, between the rows of stitches, the pad 3 to the mesh sheet 5. The outer faing sheet 7 could be of a wide range of different materials but particularly useful materials are a close woven glass cloth (e.g. of 120 gsm) neoprene coated on its outer face and an aluminium foil faced vapour barrier sheet (e.g. that known under the Trade Mark "Fireban 3500"). An alternative fire-resistant liquid-impervious material that can be used for the sheet 7 is that known under the Trade Mark "lncowrap 1312".
The adhesive sheets 9, 8 could be a 50 micron polyamide film adhesive sheet or an eva adhesive sheet (such as that known under the trade designation DAF 899 or DAF 709 (DOW)).
Polyurethane can be used as a proofing composition in place of neoprene.

Claims (14)

1. An acoustic attenuating material comprising a fibrous pad and a facing mesh sheet attached thereto by stitching, the stitching being sealed to the facing mesh sheet, characterised in that the pad is bonded to the facing mesh sheet in regions remote from the stitching by the composition used for sealing the stitch holes in the facing meshsheet.
2. An acoustic attenuating material as claimed in claim 1, in which the fibrous pad is a pad of mineral fibres.
3. An acoustic attenuating material as claimed in claim 2, in which the pad is between 1 and 5 cms thick and is made from glass fibres.
4. An acoustic attenuating material as claimed in claim 3, in which the pad has a density in the range 10 to 1 5 Kg/m3.
5. An acoustic attenuating material as claimed in any preceding claim, in which the facing mesh sheet is of woven glass fibres.
6. An acoustic attenuating material as claimed in claim 5, in which the facing mesh sheet has a mesh size of between 70 and 80 threads/decimetre.
7. An acoustic attenuating material as claimed in any preceding claim, in which sealing of the stitch holes and bonding of the pad to the facing mesh sheet is effected using a proofing composition based on polychloroprene or other film-forming hardenable compositions.
8. An acoustic attenuating material as claimed in any of claims 1 to 6, in which sealing of the stitch holes and bonding of the pad to the facing mesh sheet is effected with an adhesive layer interposed between the facing mesh sheet and a liquid impermeable outer facing sheet.
9. An acoustic attenuating material substantially as hereinbefore described and as illustrated in Fig. 1 of the accompanying drawings.
10. A method of fabricating an acoustic attenuating material comprising a fibrous pad faced with a mesh sheet, with stitching securing the mesh sheet to the pad, characterised in that the pad and mesh facing sheet are machine quilted and the mesh facing sheet is treated on its non-pad faced surface subsequent to the quilting to seal the quilting stitches and bond the pad to the mesh facing sheet.
11. A method as claimed in claim 10, in which the seal/bond is effected by transmission of proofing composition through the mesh facing sheet.
1 2. A method as claimed in claim 10, in which the seal/bond is effected by transmission through the mesh facing sheet of adhesive used to secure a liquid-impervious outer facing sheet over the mesh facing sheet.
1 3. A noise control composite comprising two faced pads according to any of claims 1 to 9 sandwiching a dense acoustic core sheet therebetween.
14. A noise control composite as claimed in claim 13, in which the core sheet has a surface density of between 3 and 10 Kg/sq.
metre and is of lead or a loaded pvc or eva sheet.
1 5. A noise control composite substantially as hereinbefore described with reference to, and as illustrated in Fig. 1 of the accompanying drawings.
GB08421484A 1983-08-26 1984-08-24 Improved acoustic attenuating material and method for making the same Expired GB2146289B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB838322968A GB8322968D0 (en) 1983-08-26 1983-08-26 Acoustic attenuating material

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GB8421484D0 GB8421484D0 (en) 1984-09-26
GB2146289A true GB2146289A (en) 1985-04-17
GB2146289B GB2146289B (en) 1987-04-01

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GB08421484A Expired GB2146289B (en) 1983-08-26 1984-08-24 Improved acoustic attenuating material and method for making the same

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000362A1 (en) * 1993-06-25 1995-01-05 W.L. Gore & Associates, Inc. Improved vehicle insulation and method for making and using same
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
WO2004060657A2 (en) * 2003-01-02 2004-07-22 3M Innovative Properties Company Acoustic web
GB2432648A (en) * 2005-11-23 2007-05-30 Abb Turbo Systems Ag Thermal insulation, edge protection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514029A (en) * 1938-10-01 1939-10-27 Schueler Werner Improvements in or relating to heat-retaining material for garments, coverlets, bandages and the like
GB1456049A (en) * 1973-03-28 1976-11-17 Kufner Textilwerke Kg Fleece lining web for garments
GB1569787A (en) * 1976-03-26 1980-06-18 Hagen Ag G Tubes or pockets for battery active material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514029A (en) * 1938-10-01 1939-10-27 Schueler Werner Improvements in or relating to heat-retaining material for garments, coverlets, bandages and the like
GB1456049A (en) * 1973-03-28 1976-11-17 Kufner Textilwerke Kg Fleece lining web for garments
GB1569787A (en) * 1976-03-26 1980-06-18 Hagen Ag G Tubes or pockets for battery active material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995000362A1 (en) * 1993-06-25 1995-01-05 W.L. Gore & Associates, Inc. Improved vehicle insulation and method for making and using same
US5472760A (en) * 1993-06-25 1995-12-05 W. L. Gore & Associates, Inc. Vehicle insulation
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
GB2386581A (en) * 2002-03-23 2003-09-24 Cliff Jackson Acoustic quilted laminate
WO2004060657A2 (en) * 2003-01-02 2004-07-22 3M Innovative Properties Company Acoustic web
WO2004060657A3 (en) * 2003-01-02 2004-09-02 3M Innovative Properties Co Acoustic web
GB2432648A (en) * 2005-11-23 2007-05-30 Abb Turbo Systems Ag Thermal insulation, edge protection
GB2432648B (en) * 2005-11-23 2010-09-22 Abb Turbo Systems Ag Turbo-charger insulation

Also Published As

Publication number Publication date
GB2146289B (en) 1987-04-01
GB8421484D0 (en) 1984-09-26
GB8322968D0 (en) 1983-09-28

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980824