WO2023006868A1 - Ecran de protection acoustique - Google Patents
Ecran de protection acoustique Download PDFInfo
- Publication number
- WO2023006868A1 WO2023006868A1 PCT/EP2022/071177 EP2022071177W WO2023006868A1 WO 2023006868 A1 WO2023006868 A1 WO 2023006868A1 EP 2022071177 W EP2022071177 W EP 2022071177W WO 2023006868 A1 WO2023006868 A1 WO 2023006868A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fibers
- screen
- sheath
- shell
- layer
- Prior art date
Links
- -1 polypropylene Polymers 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 31
- 230000008018 melting Effects 0.000 claims abstract description 31
- 239000004743 Polypropylene Substances 0.000 claims abstract description 23
- 229920001155 polypropylene Polymers 0.000 claims abstract description 23
- 239000007767 bonding agent Substances 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 61
- 239000010410 layer Substances 0.000 claims description 22
- 239000011241 protective layer Substances 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 230000004927 fusion Effects 0.000 claims description 10
- 239000000470 constituent Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000000523 sample Substances 0.000 description 23
- 229920000139 polyethylene terephthalate Polymers 0.000 description 15
- 239000005020 polyethylene terephthalate Substances 0.000 description 15
- 239000013074 reference sample Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 206010001488 Aggression Diseases 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 241000208202 Linaceae Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 230000016571 aggressive behavior Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0815—Acoustic or thermal insulation of passenger compartments
Definitions
- the invention relates to an acoustic protection screen intended to be mounted under a motor vehicle and to a method for producing such a screen.
- an acoustic protection screen intended to be mounted under a motor vehicle, said screen comprising a heat-compressed shell, said shell being based on structural fibers bonded together by a heat-activated bonding agent, said shell being provided with an outer face intended to face the road.
- Such a screen has the advantage, due to the porosity of the hull, of allowing acoustic absorption of the noise emitted by the engine.
- the object of the invention is to overcome these drawbacks by proposing a screen having great robustness in the face of the surface aggressions mentioned above, and this while offering good acoustic absorption performance.
- the invention proposes an acoustic protection screen intended to be mounted under a motor vehicle, said screen comprising a heat-compressed shell, said shell being based on structural fibers bonded together by a heat-activated bonding agent, said shell being provided with an outer face intended to face the road, said screen further having the following characteristics:
- the constituent fibers of said layer are of two types distributed according to the following percentages by weight: o between 50% and 70% of bi-component fibers comprising a core with a high melting point and a sheath with a lower melting point, said sheath ensuring the connection between the fibers following its fusion, o between 30% and 50% polypropylene fibers, so as to have an apolar component conducive to weak adhesion of the ice on said layer,
- said layer has been melted at a temperature higher than the melting temperature of said sheath and of the polypropylene and lower than that of said core, so as to provide a surface condition smoothed by said melting and to minimize the mechanical grip of the ice on said layer.
- the screen is very robust in the face of the scrapings that it is liable to undergo on the surface. Furthermore, as will be seen below, the acoustic absorption properties of the screen remain very similar to those of a screen without a protective layer.
- the invention proposes a method for producing such a screen, which comprises the following steps:
- a second fibrous layer whose fibers are of two types distributed according to the following percentages by weight: o between 50% and 70% of bi-component fibers comprising a core with a high melting point and a sheath with a lower melting point , said sheath ensuring the connection between the fibers following its fusion, o between 30% and 50% polypropylene fibers,
- FIG.1 is a schematic view in partial section of a screen according to one embodiment
- FIG.2 is a graphic representation of the performance in acoustic absorption (coefficient alpha on the ordinate) as a function of the frequency 1/3 octave in Hertz, in diffuse field, of a sample from a screen according to the invention (dotted curve) and another sample from a reference screen (solid line curve) according to the prior art (whose characteristics are presented below).
- an acoustic protection screen 1 intended to be mounted under a motor vehicle - for example a screen under the engine, under the exhaust line or even disposed in any area under the body, including in the mudguard area -, said screen comprising a thermo-compressed shell 2, said shell being based on structural fibers bound together by a heat-activated bonding agent, said shell being provided with an outer face 3 intended to face the road, said screen further having the following characteristics:
- the constituent fibers of said layer are of two types distributed according to the following percentages by weight: o between 50% and 70% of bi-component fibers comprising a core with a high melting point and a sheath with a lower melting point - for example between 110 and 180°C -, said sheath ensuring the connection between the fibers following its fusion, o between 30% and 50% of polypropylene fibers - having in particular a melting point of the order of 160°C - , so as to present an apolar component conducive to weak adhesion of the ice to said layer,
- said layer has been melted at a temperature higher than the melting temperature of said sheath and of the polypropylene and lower than that of said core, so as to provide a surface condition smoothed by said melting and to minimize the mechanical grip of the ice on said layer.
- the resistance to the passage of air of the screen 1 is between 250 and 8000 Nsnr 3 .
- the protective layer 4 is co-needled with the shell 2.
- the binding agent of the shell 2 is formed as desired:
- the two-component fibers comprise a core with a high melting point and a sheath with a lower melting point, said sheath ensuring the connection between the fibers following its fusion.
- the two-component fibers comprise a polyethylene terephthalate core, with a melting point of the order of 250° C., and the sheath is made of polyethylene terephthalate having undergone a chemical modification so as to have a lower melting point, for example of the order of 180°C.
- the shell 2 further comprises fine fibers with a count of less than 3.5 dtex intended to improve sound absorption.
- the constituent fibers of the shell 2 are distributed according to the following percentages by weight:
- the constituent fibers of the shell 2 are distributed according to the following percentages by weight:
- binding fibers in particular polypropylene or bi-component - providing a bond between the fibers of said shell following their at least partial fusion.
- the constituent fibers of the shell 2 are distributed according to the following percentages by weight:
- a second fibrous layer whose fibers are of two types distributed according to the following percentages by weight: o between 50% and 70% of bi-component fibers comprising a core with a high melting point and a sheath with a lower melting point , said sheath ensuring the connection between the fibers following its fusion, o between 30% and 50% polypropylene fibers,
- the method comprises an additional step of co-needling the fibrous webs together before they are compressed between the plates.
- the two-component fibers of the second ply have, before melting the sheath, a titer of between 2 and 5 dtex.
- the polypropylene fibers of the second ply have, before melting, a titer of between 6 and 17 dtex.
- the sample according to the invention has:
- the reference sample is only provided with a shell 2 and has no protective layer 4.
- shell 2 of the reference sample is made heavier by the mass corresponding to protective layer 4, so as to present the same surface mass (1000 g/m 2 ) as the sample according to the invention.
- a reference sample of the same thickness (4 mm) as that of the sample according to the invention is provided.
- the composition of the shell 2 of the reference sample it is the same as that of the shell 2 of the sample according to the invention.
- a sample according to the invention is compared with a reference sample having similar characteristics.
- composition of the shell 2, in the reference sample and in that according to the invention is as follows:
- the protective layer 4 of the sample according to the invention which is tested, it has the following composition:
- the ice cube detachment test is carried out as follows for the two samples, the reference one and the one according to the invention:
- the sample and the template are then placed on a support, the protective layer 4 of the sample according to the invention being turned towards said template, then 5ml of water are poured into the template, then frozen at -15+ /-2°C; then again 5 ml of water are poured; after 30 minutes, after having checked that the 10 ml are well frozen, 15 ml of water is poured into the template and left to stand at -15+/-2°C for 150 minutes, • for the measurement, a dynamometer is fixed to the jig, while holding the sample, then the sample is pulled perpendicularly; the tensile force is then measured and the surface condition of the sample is noted.
- a screen 1 provided with a protective layer 4 according to the invention which contains in particular polypropylene which is an apolar and hydrophobic molecule, makes it possible to reduce the adhesion of the ice to the surface.
- the surface state of the sample according to the invention - in this case on the side of the protective layer 4 - after tearing off the ice cube is unchanged whereas that of the reference sample is degraded, presenting a fiber stripping.
- the scraping test is carried out as follows:
- the test consists of rubbing, at a temperature of 23°C, a metal strip on a plane sample perpendicular to it and judging the state of degradation; the blade has a width of 2 mm and a length of 17 mm,
- the acoustic absorption test shows, surprisingly, that the absorption properties of the sample according to the invention are similar to those of the reference sample, and this despite the presence of the layer of protection 4, which one would have thought constituted a barrier to the penetration of acoustic waves within the screen 1.
- the presence of the protective layer 4 slightly improves the absorption performance of the screen 1 up to approximately 4000 Hz, and degrades them slightly above approximately 4000 Hz.
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280052420.7A CN117794789A (zh) | 2021-07-29 | 2022-07-28 | 隔音屏 |
EP22754881.5A EP4377158A1 (fr) | 2021-07-29 | 2022-07-28 | Ecran de protection acoustique |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2108253A FR3125766B1 (fr) | 2021-07-29 | 2021-07-29 | Ecran de protection acoustique |
FRFR2108253 | 2021-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023006868A1 true WO2023006868A1 (fr) | 2023-02-02 |
Family
ID=78212213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/071177 WO2023006868A1 (fr) | 2021-07-29 | 2022-07-28 | Ecran de protection acoustique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4377158A1 (fr) |
CN (1) | CN117794789A (fr) |
FR (1) | FR3125766B1 (fr) |
WO (1) | WO2023006868A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160333510A1 (en) * | 2015-05-13 | 2016-11-17 | Milliken & Company | Non-woven underbody shield |
US20180251924A1 (en) * | 2017-03-02 | 2018-09-06 | Foss Performance Materials, Llc | Enhanced ice peel resistance/non-woven moldable composite systems with added sound acoustical properties |
FR3089940A1 (fr) * | 2018-12-18 | 2020-06-19 | Treves Products, Services & Innovation | Système de protection acoustique pour pare-boue de véhicule automobile |
-
2021
- 2021-07-29 FR FR2108253A patent/FR3125766B1/fr active Active
-
2022
- 2022-07-28 CN CN202280052420.7A patent/CN117794789A/zh active Pending
- 2022-07-28 EP EP22754881.5A patent/EP4377158A1/fr active Pending
- 2022-07-28 WO PCT/EP2022/071177 patent/WO2023006868A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160333510A1 (en) * | 2015-05-13 | 2016-11-17 | Milliken & Company | Non-woven underbody shield |
US20180251924A1 (en) * | 2017-03-02 | 2018-09-06 | Foss Performance Materials, Llc | Enhanced ice peel resistance/non-woven moldable composite systems with added sound acoustical properties |
FR3089940A1 (fr) * | 2018-12-18 | 2020-06-19 | Treves Products, Services & Innovation | Système de protection acoustique pour pare-boue de véhicule automobile |
Also Published As
Publication number | Publication date |
---|---|
EP4377158A1 (fr) | 2024-06-05 |
CN117794789A (zh) | 2024-03-29 |
FR3125766A1 (fr) | 2023-02-03 |
FR3125766B1 (fr) | 2024-01-19 |
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