GB2200591A - Improved acoustic attenuating material - Google Patents

Improved acoustic attenuating material Download PDF

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Publication number
GB2200591A
GB2200591A GB08725469A GB8725469A GB2200591A GB 2200591 A GB2200591 A GB 2200591A GB 08725469 A GB08725469 A GB 08725469A GB 8725469 A GB8725469 A GB 8725469A GB 2200591 A GB2200591 A GB 2200591A
Authority
GB
United Kingdom
Prior art keywords
sound attenuating
attenuating material
sheet
pad
gsm
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
GB08725469A
Other versions
GB8725469D0 (en
GB2200591B (en
Inventor
Paul Bernard Absolon
Michael J Lindfield
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 GB8725469D0 publication Critical patent/GB8725469D0/en
Publication of GB2200591A publication Critical patent/GB2200591A/en
Application granted granted Critical
Publication of GB2200591B publication Critical patent/GB2200591B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B32B5/02—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
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/38—Meshes, lattices or nets
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • 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
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • B32B2315/08—Glass
    • B32B2315/085—Glass fiber cloth or fabric

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Abstract

A sound attenuating material comprises a base pad (10) of fibrous material faced on at least one side with an intermediate sheet (11), the pad and intermediate sheet(s) being held together by at least one row of stitching passing therethrough, and at least one outer facing sheet (13) adhered over the, or one of the, intermediate sheet(s), the said facing sheet providing a moisture-impermeable silicone layer at least on the side facing away from the pad (10) and being bonded by adhesive (14) to the underlying intermediate layer (11). <IMAGE>

Description

Improved acoustic attenuating material This invention relates to an acoustic attenuating material based on a pad of fibrous material. In the provision of sound attenuation it is well known to use pads of mineral fibres and to face these pads with an abrasion-resistant protective sheet.
In the specification of our British Patent 1341398 the protective sheet is a woven net of flexible nonmetallic fibres having a mesh size in a specified range, the net being adhesively bonded to the pad.
In the specification of our British Patent 2146289 a fibrous pad and a facing mesh sheet are stitched together, the pad being adhesively bonded to the sheet by the composition used to seal the stitch holes in the facing mesh sheet. Patent 2146289 also relates to a noise control composite. in which an acoustically dense core sheet is sandwiched between two mesh-faced quilted pads.
There is a commercial need for an acoustic attenuating material which has a high level of fire retardancy, a low out- gassing emission and an ultra low level of toxins present in the completed material. These last two requirements impose restraints on the choice of materials used for the bonding of the facing sheet to the pad and in the search for a material to meet the aforesaid requirements we have discovered there to be a significant advantage in fabricating an acoustic attenuating material whose abrasion-resistant protective sheet is faced with a moisture-impermeable silicone layer.
According to one aspect of the present invention a sound attenuating material comprises a base pad of fibrous material faced on at least one side with an intermediate sheet, the pad and intermediate sheet(s) being held together by at least one row of stitching passing therethrough, and at least one outer facing sheet adhered over the (or one of the) intermediate sheet(s), the said facing sheet providing a moisture-impermeable silicone layer at least on the side facing away from the pad and being adhesively bonded to the underlying intermediate layer.
Preferably the pad is a glass fibre mat made from fibres which are layered and mechanically bonded in needle felt form without the use of any organic or resinous binders. An E glass needled mat of density between 70 3 and 190 Kg/m3 is suitable and can be made from selected long fibres of diameters in the range 5 to 12 microns.
The intermediate sheet can be a mineral fibre woven scrim or a non-woven tissue and desirably a scrim or tissue of glass fibres is used. An open weave glass fibre cloth of a thickness of approximately 0.13 mm with a surface area density of 70 gsm and a mesh size of 79 warp threads per dm and 75 weft threads per dm is a convenient material to use. The stitching used to hold the pad and intermediate layer together can with advantage give a quilted appearance (e.g. a diamond pattern 150 mm long x 50 mm wide).
The outer facing sheet is desirably coated on just one side with the moisture-impermeable silicone layer.
Preferably this layer is a heat-cured silicone rubber applied to give a final coating density in the range 100 to 150 gsm. The outer facing sheets before silicone coating,can be a woven mineral fibre scrim and a preferred material is a glass fibre scrim with a surface area density of around 100 gsm (prior to coating) with some 23 threads per dm in both warp and weft. However any suitable glass fabric with a surface area density in the range 50 gsm to 400 gsm prior to coating can be used faced on one or both sides as required.
The uncoated side of a one-side coated outer facing sheet can be secured to the adjacent intermediate sheet using a pressure-sensitive adhesive. Since silicone is used on the coated side, an adhesive that will bond to the silicone layer is preferred in the case where the outer facing sheet is thin enough or of such an open weave that significant "bleed through" of coating material to the uncoated side occurs. Where a double side coated outer facing sheet is used a silicone-based adhesive is probably essential.
Material in accordance with the invention can be produced in a range of different thicknesses and 6 mm, 12 mm and 25 mm are suitable thicknesses for commercially useful material.
Sandwiching an acoustically dense layer (e.g. a 5000 gsm lead sheet) between two layers of sound attenuating material according to this invention (so that each outwardly facing sheet does exhibit a silicone layer) is a useful composite material The two base pads of the mineral fibre outer layers can be adhesively secured on opposite sides of the dense layer and the edges of the composite material can be bound and stitched to prevent ingress of moisture into the pads from the otherwise exposed edges thereof. The composition thickness and density of the dense layer (or core sheet) can, of course, be varied to suit a customer's requirements. A 0.45 mm thick sheet of lead gives a 5000 gsm core. Core sheets of surface area densities of between 3000 gsm and 10,000 gsm can be used and in place of lead, loaded pvc or eva sheet materials can be used.
The sewing of the intermediate sheet/sheets to the pad can be effected on a conventional quilting machine and the bonding of the or each pre-adhesive coated outer facing sheet to the adjacent intermediate sheet can be effected by passing the sheet(s) and pad between pressure rollers.
The invention will now be further described, by way of example, with reference to the accompanying drawing, in which: Figure 1 shows the base quilt used to make acoustic attenuating material according to this invention, Figure 2 shows the completed acoustic attenuating material made from the base quilt of Figure 1, and Figure 3 shows a composite material using two layers of material as shown in Figure 2 bonded on opposite'sides of a dense acoustic sheet.
In Figure 1 an E-glass fibre needled mat 10 (e.g.
LGF Thermal 650 material from Lancaster Glass Fibre Ltd.) has layers of "Marglass" (RTM) 250 K woven glass scrim 11 quilted thereto using glass fibre stitch patterns 12.
In Figure 2, layers 13 of 100 gsm glass fibre mesh cloth coated on one face only with a heat cured silicone rubber (applied to give a deposit of 130 gsm) are stuck with an adhesive 14 to the base quilt of Figure 1 to leave the moisture-impermeable silicone coating outermost on each side of the material. A suitable one-side coated glass mesh material for the layers 13, is a material known by the code E86/135 from H.D. Symons & Co. Ltd.
and the adhesive 14 for this material can be a siliconebased pressure sensitive adhesive applied by the suppliers of the layers 13.
Figure 3 shows two sheets of material as shown in Figure 2 bonded to opposite sides of a 0.45 mm thick sheet 15 of lead. Apollo A83 (obtainable from Apollo Chemicals Ltd) can be used to bond the scrims 11 to the sheet 15.

Claims (22)

1. A sound attenuating material comprising a base pad of fibrous material faced on at least one side with an intermediate sheet, the pad and intermediate sheet(s) being held together by at least one row of stitching passing therethrough, and at least one outer facing sheet adhered over the, or one of the, intermediate sheet(s), the said facing sheet providing a moisture-impermeable silicone layer at least on the side facing away from the pad and being adhesively bonded to the underlying intermediate layer.
2. A sound attenuating material as claimed in claim 1, in which the pad is a glass fibre mat made from fibres which are layered and mechanically bonded without the use of any organic or resinous binders.
3. A sound attenuating material as claimed in claim 2, in which the pad is a glass fibre needled mat of density between 70 and 190 Kg/m < .
4. A sound attenuating material as claimed in claim 2 or claim 3, in which the glass fibres making up the mat have diameters in the range 5 to 12 microns.
5. A sound attenuating material as claimed in any one preceding claim in which the or each intermediate sheet is a mineral fibre woven scrim or a non-woven tissue.
6. A sound attenuating material as claimed in claim 5, in which a scrim or tissue of glass fibres is used for the or each intermediate sheet.
7. A sound attenuating material as claimed in -claim 5 or claim 6, in which an open weave glass fibre cloth of a thickness of 0.13 mm with a surface area density of 70 gsm and a mesh size of 79 warp threads per dm and 75 weft threads per dm is used for the or each intermediate sheet.
8. A sound attenuating material as claimed in any one of the preceding claims, in which the stitching used to hold the pad and intermediate layer(s) together gives a quilted appearance.
9. A sound attenuating material as claimed in any one of the preceding claims, in which the or each outer facing sheet is coated on just one side with the moistureimpermeable silicone layer.
10. A sound attenuating material as claimed in claim 9, in which the moisture-impermeable silicone layer is a heat-cured silicone rubber applied to give a final coating density in the range 100 to 150 gsm.
11. A sound attenuating material as claimed in claim 10, in which the or each outer facing sheet is a woven mineral fibre scrim.
12. A sound attenuating material as claimed in claim 10, in which the or each outer facing sheet is a glass fibre scrim with a surface area density of around 100 gsm (prior to coating) with some 23 threads per dm in both warp and weft.
13. A sound attenuating material as claimed in claim 10, in which the or each outer facing sheet is a glass fabric with a surface area density in the range 50 gsm to 400 gsm prior to coating.
14. A sound attenuating material as claimed in any one of the preceding claims, in which the uncoated side of a one-side coated outer facing sheet is secured to the intermediate sheet using a pressure-sensitive adhesive.
15. A sound attenuating material as claimed in claim 14, in which the adhesive is a silicone-based adhesive.
16. A sound attenuating material as claimed in any one of the preceding claims, in which the overall thickness of the material lies in the range 6 mm to 25 mm.
17. A sound attenuating material comprising an acoustically dense layer sandwiched between two layers of sound attenuating material as claimed in claim 1 each outwardly facing sheet exhibiting a silicone layer.
18. A sound attenuating material as claimed in claim 17, in which the two base pads of the mineral fibre outer layers are adhesively secured on opposite sides of the dense layer and the edges of the composite material are bound and stitched to prevent ingress of moisture into the pads from the otherwise exposed edges thereof.
19. A sound attenuating material as claimed claim 17 or 18, in which the surface area density of the acoustically dense layer lies between 3000 and 10000 gsm.
20. A sound attenuating material as claimed in claim 19, in which the acoustically dense layer is a sheet of lead.
21. A sound attenuating material substantially as hereinbefore described with reference to, and as illustrated in, Figure 2 of the accompanying drawing.
22. A sound attenuating material substantially as hereinbefore described with reference to, and as illustrated in, Figure 3 of the accompanying drawing.
GB8725469A 1987-01-30 1987-10-30 Improved acoustic attenuating material Expired - Fee Related GB2200591B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878702127A GB8702127D0 (en) 1987-01-30 1987-01-30 Acoustic attenuating material

Publications (3)

Publication Number Publication Date
GB8725469D0 GB8725469D0 (en) 1987-12-02
GB2200591A true GB2200591A (en) 1988-08-10
GB2200591B GB2200591B (en) 1990-12-19

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GB878702127A Pending GB8702127D0 (en) 1987-01-30 1987-01-30 Acoustic attenuating material
GB8725469A Expired - Fee Related GB2200591B (en) 1987-01-30 1987-10-30 Improved acoustic attenuating material

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Application Number Title Priority Date Filing Date
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640068A1 (en) * 1988-12-07 1990-06-08 Cnim METHOD FOR MANUFACTURING COMPOSITE STRUCTURES FOR ABSORPTION OF NOISE AND COMPOSITE STRUCTURES OBTAINED BY SAID METHOD
EP0381452A2 (en) * 1989-01-31 1990-08-08 Denise M. Gendron Acoustic fabric
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
WO2002023099A1 (en) * 2000-09-18 2002-03-21 Fläkt Woods AB Sound absorbent
EP1877630A2 (en) * 2005-04-04 2008-01-16 Armstrong World Industries, Inc. Acoustical canopy system
EP3413302A1 (en) * 2017-06-05 2018-12-12 Pritex Limited Sound attenuation sheet

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640068A1 (en) * 1988-12-07 1990-06-08 Cnim METHOD FOR MANUFACTURING COMPOSITE STRUCTURES FOR ABSORPTION OF NOISE AND COMPOSITE STRUCTURES OBTAINED BY SAID METHOD
EP0374013A1 (en) * 1988-12-07 1990-06-20 Constructions Industrielles De La Mediterranee- Cnim Method of producing composite structures for the absorption of noise, and composite structures, made by this method
EP0381452A2 (en) * 1989-01-31 1990-08-08 Denise M. Gendron Acoustic fabric
EP0381452A3 (en) * 1989-01-31 1992-02-19 Denise M. Gendron Acoustic fabric
GB2324760A (en) * 1997-04-29 1998-11-04 Noisco Products Ltd Acoustic composite material
WO2002023099A1 (en) * 2000-09-18 2002-03-21 Fläkt Woods AB Sound absorbent
EP1877630A2 (en) * 2005-04-04 2008-01-16 Armstrong World Industries, Inc. Acoustical canopy system
EP1877630A4 (en) * 2005-04-04 2009-06-10 Armstrong World Ind Inc Acoustical canopy system
US7947615B2 (en) 2005-04-04 2011-05-24 Awi Licensing Company Acoustical canopy system
EP3413302A1 (en) * 2017-06-05 2018-12-12 Pritex Limited Sound attenuation sheet

Also Published As

Publication number Publication date
GB8725469D0 (en) 1987-12-02
GB2200591B (en) 1990-12-19
GB8702127D0 (en) 1987-03-04

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PCNP Patent ceased through non-payment of renewal fee