CN114787909A - Thermal and acoustic insulation assembly comprising a thermal and acoustic insulation product and a membrane at the front face - Google Patents
Thermal and acoustic insulation assembly comprising a thermal and acoustic insulation product and a membrane at the front face Download PDFInfo
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- CN114787909A CN114787909A CN202080089624.9A CN202080089624A CN114787909A CN 114787909 A CN114787909 A CN 114787909A CN 202080089624 A CN202080089624 A CN 202080089624A CN 114787909 A CN114787909 A CN 114787909A
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- 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
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- 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
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Abstract
The present invention relates to a thermal and acoustic insulation assembly comprising: -a thermal and acoustic insulation product (1) made of mineral wool, said thermal and acoustic insulation product (1) comprising a first face, called front face (1 a), intended to be directed towards the interior of a room, and a second face, called rear face (1 b), intended to be directed towards a wall (2), -a microperforated film (3) arranged on said front face (1 a) of said thermal and acoustic insulation product (1). The present invention makes it possible to significantly improve sound absorption performance without reducing sound insulation performance.
Description
Technical Field
The present invention relates to a thermal and acoustic insulation assembly for marine applications, such as ships, enabling the metal walls of the ship to be insulated.
Background
It is known to insulate walls of this type using insulating products made of mineral wool, such as the Ultimate product sold by Saint-Gobain Isover. In order to increase the sound-insulating effect, a film is provided on the front side of the heat-and sound-insulating product, that is to say on the side of the product facing the chamber to be insulated (the side opposite the side intended to face the wall). The membranes generally have a weight of 2 to 10 kg/m2And a surface density of 2000 to 2200 kg/m3So that the sound-insulating effect is remarkably improved. However, the main drawbacks of such membranes are: it is airtight, which has a negative impact on sound absorption. Thus, the noise level within the acoustic emission room may be significantly enhanced.
Therefore, there is a need for a thermal and acoustic insulation assembly comprising a thermal and acoustic insulation product and a film at the front face that can significantly improve sound absorption performance without degrading sound insulation performance.
Disclosure of Invention
To this end, the invention proposes a heat and sound insulation assembly comprising:
-a thermal and acoustic insulation product made of mineral wool comprising a first face, called front face, intended to be directed towards the interior of the chamber, and a second face, called rear face, intended to be directed towards the wall,
-a microperforated film arranged on the front face of the thermal and acoustic insulation product.
According to another feature, the resistance to air flow of the microperforated film is between 0.5 and 10 kPa.s/m, preferably between 1 and 5 kPa.s/m.
According to another featureFor thickness L, the microperforated film had a perforation degree of ϕ and a perforation diameter of D, such that ϕ D2= 32 η × L/(σ L), where σ L represents the airflow resistance of the membrane, and η represents the dynamic viscosity of air.
According to another particular feature, the microperforated film has:
a perforation degree of between 0.01% and 5%, preferably between 0.05% and 2%, even between 0.1% and 1%,
-a perforation radius between 0.01 and 0.5 mm, preferably between 0.1 and 0.25 mm.
According to another feature, the microperforated film has a surface density of between 2 and 10 kg/m2In the meantime.
According to another feature, the thermal and acoustic insulation product has a density of 13 kg/m3And 200 kg/m3Preferably 13 kg/m3And 100 kg/m3In between, even at 24 kg/m3And 100 kg/m3In between.
According to another feature, the thickness of the thermal and acoustic insulation product is between 10 mm and 150 mm, preferably between 15 mm and 150 mm, even between 20 mm and 150 mm
According to another feature, the thermal and acoustic insulation product is mainly composed of glass fibres of the aluminosilicate type.
According to another feature, the microperforated film is at least partially glued or bonded or fitted to the front face of the thermal and acoustic insulation product.
According to another feature, the assembly further comprises a surface made of mineral wool, which is arranged on the opposite face of the microperforated film to the thermal and acoustic insulation product.
According to another feature, the surface has a surface density of 0.01 kg/m2And 10 kg/m2Preferably between 0.1 kg/m2And 5 kg/m2In between.
According to another feature, the density of the surface is 20 kg/m3And 200 kg/m3Preferably between 30 kg/m3And 150 kg/m3In between, even at 30 kg/m3And 90 kg/m3In between.
According to another feature, the thickness of the surface is between 0.5 mm and 20 mm, preferably between 5 mm and 15 mm, even between 5 mm and 15 mm.
The invention also relates to the use of the above-described thermal and acoustic insulation assembly on a metal wall of a ship.
Drawings
Further features and advantages of the invention will now be described in conjunction with the appended drawings, in which:
fig. 1 shows a cross-sectional view of a thermal and acoustic insulation assembly according to the present invention mounted on a metal wall of a ship.
The same reference numbers in different drawings identify the same or similar elements.
Detailed Description
The present invention relates to a thermal and acoustic insulation assembly comprising:
a thermal and acoustic insulation product made of mineral wool comprising a first face, called front face, intended to be directed towards the interior of the compartment, and a second face, called rear face, intended to be directed towards the wall,
-a microperforated film arranged on the front face of the thermal and acoustic insulation product.
The micro-pores in the film enable control of both sound absorption and sound insulation. In fact, the membrane acts as a resistive curtain (voile r sistif), so that the wave dissipation in the thermal and acoustic insulation product located behind the membrane is greater. The presence of micropores only slightly reduces the sound-insulating properties with respect to the unperforated film, while improving the sound-absorbing properties. The size and degree of perforation may be sized to control both sound absorption and sound insulation. The low degree of perforation makes it possible to limit the deterioration of the insulation (compared with the airtight films of the prior art). Furthermore, the size of the perforations is small in order to optimize the energy dissipation by viscous friction of the air (moved by the sound waves). Therefore, the sound absorption performance is greatly improved.
Fig. 1 shows a cross-sectional view of a thermal and acoustic insulation assembly according to the present invention mounted on a wall 2, such as a steel or aluminum metal wall of a ship. The thermal and acoustic insulation assembly comprises a thermal and acoustic insulation product 1 made of mineral wool, which thermal and acoustic insulation product 1 comprises a first face, called front face 1a, intended to face the interior of the chamber to be insulated, and a second face, called back face 1b, intended to face the wall 2 of the chamber to be insulated. In this figure, the back face 1b of the thermal and acoustic insulation product is placed against the wall 2.
The thermal and acoustic insulation product is made of glass wool or rock wool, for example consisting essentially of aluminosilicate glass fibers containing between 13% and 28% by weight of alumina Al2O3。
The thermal and acoustic insulation assembly also comprises a microperforated film 3 positioned on the front face 1a of the thermal and acoustic insulation product 1 made of mineral wool.
Microperforated film 3 typically has a thickness of between 2 and 10 kg/m2Surface density of (d) in between. Thus, it is a thick film that provides good sound insulation for the thermal and acoustical insulation assembly.
Microperforated film 3 is typically a viscoelastic layer, optionally having at least one of the following properties:
-a structural damping η equal to tan δ and a function of frequency, which is greater than or equal to 5% regardless of the frequency, and/or
Young's modulus E, also a function of frequency, which is less than or equal to 500 MPa. This "low" young's modulus value gives the membrane a certain elasticity/workability, which is particularly useful for mounting on a ship wall.
Typically, the resistance to air flow of microperforated film 3 is between 0.5 kPa.s/m and 10 kPa.s/m, preferably between 1 kPa.s/m and 5 kPa.s/m. The resistance to air flow is measured according to standard ISO 9053.
The resistance to air flow of the microperforated film 3 represents a limited capacity for air to pass through, which may be related to the presence of micropores in the film. Since the resistance to air flow of the microperforated film 3 is between 0.5 kPa.s/m and 10 kPa.s/m, it introduces energy dissipation by viscous friction of air (moved by sound waves). Thus, the absorption, especially at low frequencies, is greatly improved. If the airflow resistance is too low, the sound attenuation caused by internal friction is minimal and the absorption effect provided by the membrane is low. However, the strong permeability of the membrane enables the waves to be absorbed by the thermal and acoustic insulation product situated just behind. If the resistance is too great, most of the sound waves are reflected and the absorption is reduced. Typically, below 0.5 kPa.s/m, even below 1 kPa.s/m, the sound insulation will deteriorate. Above 10 kPa.s/m, the absorption does not increase any more.
Preferably, for thickness L, microperforated film 3 also has a perforation degree ϕ and a perforation diameter D such that ϕ D2= 32 η × L/(σ L), where σ L represents the airflow resistance of the microperforated film, and η represents the kinetic viscosity of air. For a given resistance to airflow, the relationship of perforation degree/perforation diameter may thus be defined. Microperforated films may be perforated with microperforations of various diameters. The perforations may have any geometric shape, such as circular, oval or slot shapes.
Thus, for example, microperforated film 3 has:
a degree of perforation (percentage of hole surface area/total surface area) between 0.01% and 5%, preferably between 0.05% and 2%, even between 0.1% and 1%,
-a perforation radius between 0.01 and 0.5 mm, preferably between 0.1 and 0.25 mm.
A degree of perforation ranging between 0.01% and 5%, preferably between 0.05% and 2%, even between 0.1% and 1% makes it possible to optimize both the sound-damping and the sound-absorption. For lower perforation values, it tends to become a gas-tight film, while for higher perforation values there is a risk of significantly reducing the insulation performance. Thus, a degree of perforation of between 0.01% and 5% advantageously makes it possible to obtain an acceptable compromise between a significant sound absorption gain and a very modest sound insulation loss.
Microperforated film 3 is preferably at least partially adhered or bonded or fitted to front face 1a of thermal and acoustic insulation product 1. The connection or bonding is preferably produced by adhesive bonding, for example in the form of glue dots or glue lines. The entire surface of the backing layer of the film need not be coated with adhesive.
Furthermore, the thermal and acoustic insulation product 1 generally has a thickness of between 13 kg/m3And 200 kg/m3A density of 13 kg/m or more3And 100 kg/m3In between, even at 24 kg/m3And 100 kg/m3In the meantime. This density range gives the thermal and acoustic insulation product sufficient mechanical strength properties for the intended application, i.e. the insulation of the substantially vertical walls of the shipAnd (6) the application is excellent.
The thermal and acoustic insulation product 1 also generally has a thickness comprised between 10 mm and 150 mm, preferably between 15 mm and 150 mm, even between 20 mm and 150 mm. This thickness range enables the thermal and acoustic insulation product to have good mechanical strength and to sufficiently absorb sound waves for the intended application.
Preferably, thermal and acoustic insulation product 1 has a Young's modulus between 5 kPa and 2 MPa and a damping between 0% and 50%. Young's modulus and damping were measured according to the standard ISO 18437 and according to the article "Polynominal relationships for qualitative-static mechanical characterization of anisotropic cellular materials" by C.Langlois, R.Paneton and N.Atalla on page 3032-3040, volume 110, J.Acoust. Soc. Am., published 2001. Young's modulus is important for sound damping properties.
Optionally, the assembly also comprises a surface 6 made of mineral wool, which is arranged on the opposite face of the microperforated film to that of the thermal and acoustic insulation product 1, and therefore on the front face of the microperforated film 3, with the rear face of the microperforated film 3 being arranged against the front face 1a of the thermal and acoustic insulation product 1. The surface 6 is a thin layer with respect to the thermal and acoustic insulation product 1. The surface 6 makes it possible to further improve the sound absorption, in particular at higher frequencies than the microperforated film 3.
The surface density of the surface 6 is usually 0.01 kg/m2And 10 kg/m2Preferably 0.1 kg/m2And 5 kg/m2In the meantime. This range of surface density imparts sound-insulating properties to the surface 6.
The density of the surface 6 is generally 20 kg/m3And 200 kg/m3Preferably between 30 kg/m3And 150 kg/m3In between, even at 30 kg/m3And 90 kg/m3In between. This density range gives the surface 6 mechanical strength properties.
The thickness of the surface 6 is generally between 0.5 mm and 20 mm, preferably between 5 mm and 15 mm, even between 5 mm and 15 mm. This density range gives the surface 6 mechanical strength and sound absorption properties.
According to the embodiment shown in fig. 1, the assembly formed by thermal and acoustic insulation product 1 and microperforated film 3 is attached to metal wall 2 by means of pin 5 and gasket 4, pin 5 passing through gasket 4, microperforated film 3 and thermal and acoustic insulation product 1 and being embedded in wall 2. Surface 6 may also be held by pin 4 and washer 5 when surface 6 is present, or surface 6 may also be adhered on top of the microperforated film as shown in FIG. 1. The cooperation of the thermal and acoustic insulation assembly with the metal wall 2 may be accomplished by any other known means for attaching the membrane to the insulation product.
The sound absorption and sound insulation performance of three thermal and sound insulation assemblies were tested:
-a first reference assembly comprising a thermal and acoustic insulation product and an airtight membrane;
-a second assembly comprising the same thermal and acoustic insulation product and a microperforated film according to the present invention;
-a third component comprising the same thermal and acoustic insulation product, a microperforated film according to the present invention and a surface.
The thermal and acoustic insulation product common to the three thermal and acoustic insulation assemblies is a mineral wool board from Saint-Gobain Isover under the trade mark Ultimate, having a density of 24 kg/m3 and a thickness of 50 mm.
The air-tight membrane of the first thermal and acoustic insulation assembly has an airflow resistance of 70 kpa.s/m. It is a membrane from Saint-Gobain Isover under the trademark SeaProtect dB Flex Alu.
The microperforated films of the second and third thermal and acoustical insulation assemblies are the same as those available under the trademark SeaProtect dB Flex Alu from Saint-Gobain Isover, but are perforated. After perforation, the air flow resistance was 0.640 kPa.s/m, the thickness was 1.7 mm, and the surface density was 3 kg/m2The degree of perforation was 0.4%, and the radius of microperforation was 0.319 mm. The surface density of the microperforated film was 3.25 kg/m2。
The surface of the third thermal and acoustical insulation component is a surface from Saint-Gobain Isover under the trade name Ultimate. It has a surface density of 0.36 kg/m2Density of 24 kg/m3And the thickness is 15 mm.
The first thermal and acoustic insulation assembly has an acoustic absorption coefficient α of 0.05WAnd a sound insulation R of 51 dBw。
The second thermal and acoustic insulation assembly has an acoustic absorption coefficient α of 0.25WAnd a sound insulation R of 50 dBw。
The third thermal and acoustic insulation assembly has an acoustic absorption coefficient α of 0.65WAnd a sound insulation R of 51 dBw。
The sound absorption coefficient and the sound insulation amount were measured on three kinds of products. The sound absorption coefficient alpha is measured according to the standard ISO 354S. Alpha is then calculated according to standard ISO 11654WAnd (4) indexes.
The sound insulation is measured according to the standard ISO 10140-2. R is then calculated according to standard ISO 717-1wAnd (4) indexes.
A sound absorption coefficient gain (α) of 0.2 was observed between the second thermal and acoustic insulation assembly (according to the invention) and the first thermal and acoustic insulation assembly (reference)W) And-1 dB of sound insulation loss (R)w) A sound absorption coefficient gain (α) of 0.6 was observed between the third thermal and acoustic insulation assembly (according to the invention) and the first thermal and acoustic insulation assembly (reference)W) And no loss of sound insulation.
It has thus been demonstrated that the thermal and acoustic insulation assembly according to the invention is clearly capable of greatly increasing the sound absorption properties, while hardly reducing, if not at all, the acoustic insulation properties, this effect being even more pronounced when a surface is also present.
The invention also relates to the use of a thermal and acoustic insulation assembly according to the invention on a metal wall made of steel or aluminium of a ship, with the aim of greatly improving the sound absorption properties, while hardly reducing, or even not at all, the acoustic insulation properties in the cabin.
Claims (15)
1. A thermal and acoustic insulation assembly comprising:
-a thermal and acoustic insulation product (1) made of mineral wool, said product (1) comprising a first face, called front face (1 a), intended to face the interior of the room, and a second face, called rear face (1 b), intended to face the wall (2),
-a microperforated film (3) arranged on the front face (1 a) of the thermal and acoustic insulation product (1).
2. Thermal and acoustic insulation assembly, according to claim 1, characterized in that said microperforated film (3) is a viscoelastic layer, optionally having:
-a structural damping η, said structural damping being greater than or equal to 5% regardless of the frequency, and/or
-young's modulus E, said young's modulus being less than or equal to 500 MPa, regardless of frequency.
3. Thermal and acoustic insulation assembly, according to claim 1 or 2, characterized in that said microperforated film (3) has an air flow resistance of between 0.5 and 10 kpa.s/m, preferably between 1 and 5 kpa.s/m.
4. Thermal and acoustic insulation assembly, according to any one of claims 1 to 3, characterized in that, for thickness L, the microperforated film (3) has a degree of perforation ϕ and a perforation diameter D such that ϕ D2= 32 η × L/(σ L), where σ L represents the airflow resistance of the membrane, and η represents the dynamic viscosity of air.
5. Heat and sound insulation assembly according to any one of claims 1 to 4, characterized in that said microperforated film (3) has:
a perforation degree of between 0.01% and 5%, preferably between 0.05% and 2%, even between 0.1% and 1%,
-a perforation radius between 0.01 and 0.5 mm, preferably between 0.1 and 0.25 mm.
6. Assembly according to any one of claims 1 to 5, characterized in that said microperforated film (3) has a surface density of between 2 and 10 kg/m2In the meantime.
7. Heat and sound insulation assembly according to any one of claims 1 to 6, characterized in that said heat and sound insulation product (1) has a density of 13 kg/m3And 200 kg/m3Preferably 13 kg/m3And 100 kg/m3In between, even at 24 kg/m3And 100 kg/m3In the meantime.
8. Thermal and acoustic insulation assembly according to any one of claims 1 to 7, characterized in that the thickness of the thermal and acoustic insulation product (1) is between 10 mm and 150 mm, preferably between 15 mm and 150 mm, even between 20 mm and 150 mm.
9. Thermal and acoustic insulation assembly according to any one of claims 1 to 8, characterized in that said thermal and acoustic insulation product (1) consists essentially of glass fibres of the aluminosilicate type.
10. Thermal and acoustic insulation assembly according to any one of claims 1 to 9, characterized in that said microperforated film (3) is at least partially glued or bonded or fitted to the front face of the thermal and acoustic insulation product.
11. Thermal and acoustic insulation assembly according to any one of claims 1 to 10, characterized in that it further comprises a surface (6) made of mineral wool, said surface (6) being provided on the opposite face of said microperforated film (3) to said thermal and acoustic insulation product (1).
12. -a heat and sound insulation assembly according to claim 11, characterized in that the surface density of said surface (6) is 0.01 kg/m2And 10 kg/m2Preferably 0.1 kg/m2And 5 kg/m2In between.
13. Thermal and acoustic insulation assembly, according to claim 11 or 12, characterized in that said surface (6) has a density of 20 kg/m3And 200 kg/m3Preferably between 30 kg/m3And 150 kg/m3In between, even at 30 kg/m3And 90 kg/m3In between.
14. Thermal and acoustic insulation assembly according to any one of claims 11 to 13, characterized in that the thickness of said surface (6) is between 0.5 mm and 20 mm, preferably between 5 mm and 15 mm, even between 5 mm and 15 mm.
15. Use of a thermal and acoustic insulation assembly according to any one of claims 1 to 14 on a metal wall of a ship.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR1915426 | 2019-12-23 | ||
| FR1915426A FR3105552B1 (en) | 2019-12-23 | 2019-12-23 | THERMAL AND ACOUSTIC INSULATION ASSEMBLY COMPRISING A THERMAL AND ACOUSTIC INSULATION PRODUCT AND A MEMBRANE ON THE FRONT FACE |
| PCT/EP2020/087531 WO2021130190A1 (en) | 2019-12-23 | 2020-12-21 | Thermal and acoustic insulation assembly comprising a thermal and acoustic insulation product and a membrane at the front face |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114787909A true CN114787909A (en) | 2022-07-22 |
Family
ID=70154592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080089624.9A Pending CN114787909A (en) | 2019-12-23 | 2020-12-21 | Thermal and acoustic insulation assembly comprising a thermal and acoustic insulation product and a membrane at the front face |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4082004A1 (en) |
| CN (1) | CN114787909A (en) |
| FR (1) | FR3105552B1 (en) |
| WO (1) | WO2021130190A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1180186B2 (en) * | 2000-03-20 | 2009-01-14 | Newmat, S.A | Flexible polymer material sheet for stretched constructions and false ceiling comprising this sheet |
| RU2238378C2 (en) * | 2000-03-20 | 2004-10-20 | Ньюмат, С.А. | Flexible sheet material for stretched structure, method of its production and sheet material for stretched suspended ceiling |
| DE102006027230A1 (en) * | 2006-06-09 | 2007-12-20 | EFA -Entwicklungsgesellschaft für Akustik mbH | Acoustic and thermal insulation |
| US9390702B2 (en) * | 2014-03-27 | 2016-07-12 | Acoustic Metamaterials Inc. | Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same |
-
2019
- 2019-12-23 FR FR1915426A patent/FR3105552B1/en active Active
-
2020
- 2020-12-21 EP EP20829300.1A patent/EP4082004A1/en active Pending
- 2020-12-21 CN CN202080089624.9A patent/CN114787909A/en active Pending
- 2020-12-21 WO PCT/EP2020/087531 patent/WO2021130190A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP4082004A1 (en) | 2022-11-02 |
| FR3105552B1 (en) | 2022-05-27 |
| FR3105552A1 (en) | 2021-06-25 |
| WO2021130190A1 (en) | 2021-07-01 |
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