CN106801387A - Cement base sound-absorbing porous material - Google Patents
Cement base sound-absorbing porous material Download PDFInfo
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- CN106801387A CN106801387A CN201710171163.XA CN201710171163A CN106801387A CN 106801387 A CN106801387 A CN 106801387A CN 201710171163 A CN201710171163 A CN 201710171163A CN 106801387 A CN106801387 A CN 106801387A
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- sound
- absorbing
- cement base
- hole
- porous material
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- 239000004568 cement Substances 0.000 title claims abstract description 63
- 239000011148 porous material Substances 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 91
- 238000010521 absorption reaction Methods 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 235000019362 perlite Nutrition 0.000 claims description 13
- 239000010451 perlite Substances 0.000 claims description 13
- 239000008187 granular material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 11
- 239000004088 foaming agent Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- -1 light haydite Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002745 absorbent Effects 0.000 abstract description 3
- 239000002250 absorbent Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000011358 absorbing material Substances 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 238000002847 impedance measurement Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000014347 soups Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Building Environments (AREA)
Abstract
The invention belongs to building material field, more preferable cement base sound-absorbing porous material of a kind of sound absorbing capabilities and preparation method thereof is specifically disclosed.The cement base sound-absorbing porous material, including body of material, are provided with sound absorption structure on the body of material, the sound absorption structure includes at least two sound-absorbing hole, and the sound-absorbing hole is uniformly distributed on one of side of body of material.By setting the main sound absorption structure being made up of equally distributed multiple sound-absorbing hole on one of side of body of material on body of material, the pore structure of cement base sound-absorbing porous material can not only be optimized, acoustic energy is absorbed beneficial to it, and increase the porous absorbent structure of material internal and the directly contact area of sound wave, strengthen the viscous effect to air, the average sound absorption coefficient of cement base sound-absorbing porous material can be lifted up to 6%~30%, the sound absorbing capabilities of cement base sound-absorbing porous material are substantially increased.
Description
Technical field
The invention belongs to building material field, and in particular to a kind of cement base sound-absorbing porous material and preparation method thereof.
Background technology
With the development of social economy, the health of the noise pollution serious harm public.At present, sound-absorbing material is considered as
Alleviate one of important means of noise pollution.In numerous sound-absorbing materials, cement based porous materials with its excellent mechanical performance and
Weather resistance, and it is with low cost, be readily produced the features such as processing, environmental protection and turn into the important research side of sound-absorbing material
To being studied for improving the problem of noise pollution under railway, the natural environment such as highway.
At present, existing cement based porous materials are mainly and are made up of Binder Materials, porous aggregate, fiber and other material,
So that its internal generation porous sound absorption structure, and its internal pore size is adjusted by adding foaming agent and improvement preparation technology
And quantity.Because existing cement based porous materials carry out sqouynd absorption lowering noise just with the porous sound absorption structure of material internal, because
The effect of this its alleviation noise pollution is general.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of more preferable cement base sound-absorbing porous material of sound absorbing capabilities.
The technical solution adopted for the present invention to solve the technical problems is：Cement base sound-absorbing porous material, including material blank
Body, is provided with sound absorption structure on the body of material, the sound absorption structure includes at least two sound-absorbing hole, and the sound-absorbing hole is uniform
It is distributed on one of side of body of material.
It is further that the sound-absorbing hole is cylindrical hole.
It is further that the aperture d of the sound-absorbing hole is 5mm~20mm.
It is further that the depth h of the sound-absorbing hole is no more than the 80% of body of material thickness H.
It is further that the depth h of the sound-absorbing hole is the 30%~70% of body of material thickness H.
It is further, sound-absorbing hole rectangular array distribution on the side of body of material.
It is further that the distance between two sound-absorbing hole of arbitrary neighborhood l is 1.5~2 times of sound-absorbing hole aperture d.
Be further, the body of material by it is light porous gather materials, cement, water and additive is for raw material is prepared from；
It is described that light porous to gather materials be at least one in expanded perlite granule, light haydite, slag particle；
The additive is at least one in water reducer, foaming agent, fiber.
Present invention also offers a kind of preparation method of cement base sound-absorbing porous material, the method is above-mentioned any for preparing
A kind of cement base sound-absorbing porous material, comprises the following steps：
Step one, by design cement base sound-absorbing porous material raw material proportioning and preparation method prepare body of material；
Step 2, one piece of perforated template well prepared in advance of laying on a side of body of material；
Step 3, the suitable drill bit of selection are simultaneously assembled on perforation machine；
Step 4, the shower water on body of material, then use perforation machine by the hole position in perforated template to material
Material base body carries out drilling treatment, forms more than two sound-absorbing hole；
Step 5, completion drilling treatment, body of material is placed on stockyard.
It is further that in step 4, the aperture d of the sound-absorbing hole bored is 5mm~20mm, and the depth h of sound-absorbing hole is material
The 30%~70% of material base body thickness H；The sound-absorbing hole bored rectangular array distribution on the side of body of material, and any phase
The distance between two adjacent sound-absorbing hole l is 1.5~2 times of sound-absorbing hole aperture d.
The beneficial effects of the invention are as follows：Set main by one of side of body of material by body of material
The sound absorption structure of upper equally distributed multiple sound-absorbing hole compositions, can not only optimize the hole knot of cement base sound-absorbing porous material
Structure, acoustic energy is absorbed beneficial to it, and increases the porous absorbent structure of material internal and the directly contact area of sound wave, and it is right to strengthen
The viscous effect of air, can lift the average sound absorption coefficient of cement base sound-absorbing porous material up to 6%~30%, substantially increase water
The sound absorbing capabilities of mud Quito hole sound absorbing material.The inventive method is simple to operation, and processing cost is cheap, to cement base porous sound absorption
The lifting effect is significant of material sound absorbing capabilities.
Brief description of the drawings
Fig. 1 is the implementation structural representation of cement Quito hole sound absorbing material in the present invention；
Fig. 2 is the sectional view of the line A-A along Fig. 1；
Marked in figure：Body of material 100, the aperture d of sound-absorbing hole 101, sound-absorbing hole, the depth h of sound-absorbing hole, body of material
The distance between thickness H, two adjacent sound-absorbing hole l.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
With reference to shown in Fig. 1 and Fig. 2, cement base sound-absorbing porous material, including body of material 100, on the body of material 100
Sound absorption structure is provided with, the sound absorption structure includes at least two sound-absorbing hole 101, and the sound-absorbing hole 101 is uniformly distributed in material
On one of side of base substrate 100.
Wherein, body of material 100 it is main by it is light porous gather materials, cement, water and additive is for raw material is prepared from；It is described
It is light porous that to gather materials be at least one in expanded perlite granule, light haydite, slag particle；The additive is diminishing
At least one in agent, foaming agent, fiber.For example：Body of material 100, the raw material matched by following weight is prepared from：Cement
100 parts, 180~250 parts of slag particle, 0~40 part of expanded perlite granule, 45~55 parts of water, 2~4 parts of water reducer, foaming agent
0~2 part, 0~0.4 part of fiber.
The preparation process of body of material 100 is as follows：
1. required cement, slag particle, expanded perlite granule, water, water reducer, foaming agent, is weighed by weight ratio
Make with fiber；When slag particle and/or aqueous expanded perlite granule, the quality for being converted into drying regime is re-weighed, and will
Contained humidity is counted in the water as raw material；In the step, slag particle and/or expanded perlite granule refer to slag particle,
Or expanded perlite granule, or slag particle and expanded perlite granule；
2., fiber is added to the water and 30~60s of mechanical quick stirring is used, this step is skipped when without fiber；
3. during cement and water reducer, continuously added into water, and stirring is prepared into cement paste；
4., to adding foaming agent in cement paste and continuing stirring, this step is skipped when without foaming agent；
5., to continuing to add slag particle and expanded perlite granule in cement paste and stirring 60~120s, it is made half
The compound of dry state；
6., compound is packed into mould, it is material blank then to use the static pressure of 50 ± 2kPa compressing；
7., maintenance and the demoulding；In the step, temperature is typically employed in conserve 1 under conditions of 20 DEG C, relative humidity 90%
The demoulding after it；Sometimes, in order to shorten demoulding time, increase the utilization rate of mould, use temperature for 40~60 DEG C of wet-hot steam
Carry out the demoulding after rapid curing；
8., the material blank after the demoulding was continued to conserve to age, intensity is reached the requirement of 28 day age.
Generally body of material 100 is suppressed or is cut into the thickness of 60~100mm.
The sound absorption structure set on body of material 100 can be for various, such as：Multiple spherical grooves, multiple spheres are convex
Rise, the plate of sound conduction medium, polylith sound absorption material, the labyrinth structure etc. of polylith baffle composition, the sound absorption structure is excellent
Elect structure as depicted in figs. 1 and 2 as, i.e., the well-regulated multiple suctions being distributed on one of side of body of material 100
Acoustic aperture 101.Distribution mode of the multiple sound-absorbing hole 101 on one of side of body of material 100 can be for various, preferably
The mode of the rectangular array distribution on the side of body of material 100 of sound-absorbing hole 101.
The purpose for setting sound-absorbing hole 101 is the pore structure for optimizing cement base sound-absorbing porous material, and is increased in material
The porous absorbent structure in portion and the directly contact area of sound wave；Sound-absorbing hole 101 can be square hole, prism hole, cylindrical hole etc., excellent
Elect cylindrical hole as；By researching and analysing and testing inspection to cement base sound-absorbing porous material sound absorbing mechanism, when sound-absorbing hole 101 is
Cylindrical hole, and the aperture d of sound-absorbing hole 101 is that the distance between 5mm~20mm, two sound-absorbing hole 101 of arbitrary neighborhood l is sound absorption
1.5~2 times of the aperture d of hole 101, the depth h of sound-absorbing hole 101 no more than the thickness H of body of material 100 80% when, to cement base
The lifting of sound-absorbing porous material sound absorbing capabilities is most；Preferably, the depth h of the sound-absorbing hole 101 is the thickness H of body of material 100
30%~70%.
The preparation method of cement base sound-absorbing porous material, the method is used to prepare any one porous suction of above-mentioned cement base
Sound material, comprises the following steps：
Step one, by design cement base sound-absorbing porous material raw material proportioning and preparation method prepare body of material
100；
Step 2, one piece of perforated template well prepared in advance of laying on a side of body of material 100, to ensure to bore
The uniformity in hole；
Step 3, the suitable drill bit of selection are simultaneously assembled on perforation machine；
Step 4, the shower water on body of material 100, then using perforation machine by the hole position pair in perforated template
Body of material 100 carries out drilling treatment, forms more than two sound-absorbing hole 101；In the step, the hole of the sound-absorbing hole 101 bored
Footpath d is 5mm~20mm, and the depth h of sound-absorbing hole 101 is the 30%~70% of the thickness H of body of material 100；The sound-absorbing hole 101 bored
The rectangular array distribution on the side of body of material 100, and the distance between two sound-absorbing hole 101 of arbitrary neighborhood l is to inhale
1.5~2 times of the aperture d of acoustic aperture 101；
Step 5, completion drilling treatment, body of material 100 is placed on stockyard.
Embodiment 1
By 100 parts of cement, 200 parts of slag particle, 0 part of expanded perlite granule, 50 parts of water, 3 parts of water reducer, foaming agent 0
Part, the raw material weight proportioning of soup processed and the preparation process of above-mentioned body of material 100 that 0 part of fiber, it is 80mm's to be prepared for a kind of thickness
Cement base sound-absorbing porous material, and with reference to GBJ88-85《Standing-wave-tube method acoustic absorptivity and acoustic impedance measurement specification》Carry out experiment inspection
Survey, it is 0.621 to measure it in the average sound absorption coefficient of 250Hz~2000Hz.
Using above-mentioned cement base sound-absorbing porous material as the body of material of cement base sound-absorbing porous material of the invention
100, and the rectangular array multiple sound-absorbing hole 101 of distribution setting are pressed on one of side of the body of material 100, drilling is completed
Afterwards, the chip in sound-absorbing hole 101 is bored in cleaning.Wherein, the aperture d of sound-absorbing hole 101, the depth h and body of material of sound-absorbing hole 101
The ratio between the distance between the ratio between 100 thickness H, two adjacent sound-absorbing hole 101 l and aperture d of sound-absorbing hole 101 is as shown in table 1；
Detected through standing-wave-tube method, average sound absorption coefficient, sound absorption properties of the cement base sound-absorbing porous material of the invention in 250Hz~2000Hz
Energy enhancing rate is as shown in table 1.
Table 1：The implementation parameter and its actual effect of embodiment 1
Embodiment 2
By 100 parts of cement, 180 parts of slag particle, 20 parts of expanded perlite granule, 50 parts of water, 2 parts of water reducer, foaming agent 2
Part, the raw material weight proportioning of soup processed and the preparation process of above-mentioned body of material 100 that 0.2 part of fiber are prepared for a kind of thickness for 80mm
Cement based porous materials, and with reference to GBJ88-85《Standing-wave-tube method acoustic absorptivity and acoustic impedance measurement specification》Carry out experiment inspection
Survey, it is 0.728 to measure it in the average sound absorption coefficient of 250Hz~2000Hz.
Using above-mentioned cement base sound-absorbing porous material as the body of material of cement base sound-absorbing porous material of the invention
100, and the rectangular array multiple sound-absorbing hole 101 of distribution setting are pressed on one of side of the body of material 100, drilling is completed
Afterwards, the chip in sound-absorbing hole 101 is bored in cleaning.Wherein, the aperture d of sound-absorbing hole 101, the depth h and body of material of sound-absorbing hole 101
The ratio between the distance between the ratio between 100 thickness H, two adjacent sound-absorbing hole 101 l and aperture d of sound-absorbing hole 101 is as shown in table 2；
Detected through standing-wave-tube method, average sound absorption coefficient, sound absorption properties of the cement base sound-absorbing porous material of the invention in 250Hz~2000Hz
Energy enhancing rate is as shown in table 2.
Table 2：The implementation parameter and its actual effect of embodiment 2
。
Embodiment 3
By 100 parts of cement, 25 parts of expanded perlite, 45 parts of water, 3 parts of water reducer, 0 part of foaming agent, the original that 0.4 part of fiber
The preparation process of material weight proportion and above-mentioned body of material 100, is prepared for the cement based porous materials that a kind of thickness is 80mm,
And with reference to GBJ88-85《Standing-wave-tube method acoustic absorptivity and acoustic impedance measurement specification》Carry out testing inspection, measure its 250Hz~
The average sound absorption coefficient of 2000Hz is 0.595.
Using above-mentioned cement base sound-absorbing porous material as the body of material of cement base sound-absorbing porous material of the invention
100, and the rectangular array multiple sound-absorbing hole 101 of distribution setting are pressed on one of side of the body of material 100, drilling is completed
Afterwards, the chip in sound-absorbing hole 101 is bored in cleaning.Wherein, the aperture d of sound-absorbing hole 101, the depth h and body of material of sound-absorbing hole 101
The ratio between the distance between the ratio between 100 thickness H, two adjacent sound-absorbing hole 101 l and aperture d of sound-absorbing hole 101 is as shown in table 3；
Detected through standing-wave-tube method, average sound absorption coefficient, sound absorption properties of the cement base sound-absorbing porous material of the invention in 250Hz~2000Hz
Energy enhancing rate is as shown in table 3.
Table 3：The implementation parameter and its actual effect of embodiment 3
。
Claims (10)
1. cement base sound-absorbing porous material, including body of material (100), it is characterised in that：Set on the body of material (100)
There is sound absorption structure, the sound absorption structure includes at least two sound-absorbing hole (101), and the sound-absorbing hole (101) is uniformly distributed in material
On one of side of base substrate (100).
2. cement base sound-absorbing porous material as claimed in claim 1, it is characterised in that：The sound-absorbing hole (101) is cylindrical hole.
3. cement base sound-absorbing porous material as claimed in claim 2, it is characterised in that：The aperture d of the sound-absorbing hole (101) is
5mm~20mm.
4. cement base sound-absorbing porous material as claimed in claim 3, it is characterised in that：The depth h of the sound-absorbing hole (101) is not
More than the 80% of body of material (100) thickness H.
5. cement base sound-absorbing porous material as claimed in claim 4, it is characterised in that：The depth h of the sound-absorbing hole (101) is
The 30%~70% of body of material (100) thickness H.
6. the cement base sound-absorbing porous material as described in claim 3,4 or 5, it is characterised in that：The sound-absorbing hole (101) is in material
Rectangular array distribution on the side of material base body (100).
7. cement base sound-absorbing porous material as claimed in claim 6, it is characterised in that：Two sound-absorbing hole of arbitrary neighborhood
The distance between (101) l is 1.5~2 times of sound-absorbing hole (101) aperture d.
8. the cement base sound-absorbing porous material as described in claim 1,2,3,4 or 5, it is characterised in that：The body of material
(100) by it is light porous gather materials, cement, water and additive is for raw material is prepared from；
It is described that light porous to gather materials be at least one in expanded perlite granule, light haydite, slag particle；
The additive is at least one in water reducer, foaming agent, fiber.
9. the preparation method of cement base sound-absorbing porous material, it is characterised in that：The method is used to prepare in claim 1 to 8 appoints
Cement base sound-absorbing porous material described in meaning one, comprises the following steps：
Step one, by design cement base sound-absorbing porous material raw material proportioning and preparation method prepare body of material (100)；
Step 2, one piece of perforated template well prepared in advance of laying on a side of body of material (100)；
Step 3, the suitable drill bit of selection are simultaneously assembled on perforation machine；
Step 4, the shower water on body of material (100), then use perforation machine by the hole position in perforated template to material
Material base body (100) carries out drilling treatment, forms more than two sound-absorbing hole (101)；
Step 5, completion drilling treatment, body of material (100) is placed on stockyard.
10. the preparation method of cement base sound-absorbing porous material as claimed in claim 9, it is characterised in that：In step 4, bored
The aperture d of sound-absorbing hole (101) be 5mm~20mm, the depth h of sound-absorbing hole (101) is the 30% of body of material (100) thickness H
~70%；The sound-absorbing hole (101) bored on the side of body of material (100) rectangular array distribution, and arbitrary neighborhood two
The distance between individual sound-absorbing hole (101) l is 1.5~2 times of sound-absorbing hole (101) aperture d.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710171163.XA CN106801387A (en) | 2017-03-21 | 2017-03-21 | Cement base sound-absorbing porous material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710171163.XA CN106801387A (en) | 2017-03-21 | 2017-03-21 | Cement base sound-absorbing porous material |
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Family
ID=58988219
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111995324A (en) * | 2020-08-28 | 2020-11-27 | 南京好声音环保工程有限公司 | Non-metal light sound absorption and insulation board |
| US20220341107A1 (en) * | 2019-10-01 | 2022-10-27 | Sealed Air Verpackungen Gmbh | Sound absorber |
| EP4310253A1 (en) * | 2022-07-22 | 2024-01-24 | Hatko Kaucuk Anonim Sirketi | Sound barrier |
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| CN204266138U (en) * | 2014-10-19 | 2015-04-15 | 湖南鑫凯环保节能科技有限公司 | A kind of cement based sound-absorbing composite board |
| CN105568880A (en) * | 2016-02-29 | 2016-05-11 | 淄博北辰环保科技有限公司 | Once-pouring-formed split-type nonmetal sound barrier for traffic road |
| CN106495619A (en) * | 2016-11-11 | 2017-03-15 | 中国电建集团成都勘测设计研究院有限公司 | Cement based railway sound barrier sound-absorbing material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220341107A1 (en) * | 2019-10-01 | 2022-10-27 | Sealed Air Verpackungen Gmbh | Sound absorber |
| US12270165B2 (en) * | 2019-10-01 | 2025-04-08 | Sealed Air Verpackungen Gmbh | Sound absorber |
| CN111995324A (en) * | 2020-08-28 | 2020-11-27 | 南京好声音环保工程有限公司 | Non-metal light sound absorption and insulation board |
| EP4310253A1 (en) * | 2022-07-22 | 2024-01-24 | Hatko Kaucuk Anonim Sirketi | Sound barrier |
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