WO2020184043A1 - 防音材 - Google Patents

防音材 Download PDF

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Publication number
WO2020184043A1
WO2020184043A1 PCT/JP2020/005527 JP2020005527W WO2020184043A1 WO 2020184043 A1 WO2020184043 A1 WO 2020184043A1 JP 2020005527 W JP2020005527 W JP 2020005527W WO 2020184043 A1 WO2020184043 A1 WO 2020184043A1
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WIPO (PCT)
Prior art keywords
layer
charged
conductive ferromagnetic
conductive
insulator layer
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.)
Ceased
Application number
PCT/JP2020/005527
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English (en)
French (fr)
Japanese (ja)
Inventor
宇都宮尚志
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.)
Tangent
Tangent Co Ltd
Original Assignee
Tangent
Tangent Co Ltd
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Application filed by Tangent, Tangent Co Ltd filed Critical Tangent
Priority to CN202080020000.1A priority Critical patent/CN113557176B/zh
Publication of WO2020184043A1 publication Critical patent/WO2020184043A1/ja
Priority to US17/472,594 priority patent/US12027148B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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    • 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
    • B32B5/18—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 features of a layer of foamed material
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    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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Definitions

  • the present invention relates to a soundproof material.
  • Conventional soundproofing materials are soundproofing materials (concrete, iron plate, etc.) that reflect sound waves and block them from transmitting sound, and sound absorbing materials that convert sound energy into heat energy due to friction and attenuate the energy as sound waves. (Glass wool, urethane foam, etc.) is mainly used
  • the sound insulation performance is basically based on the surface density (mass law)
  • the sound insulation material becomes larger and heavier.
  • the present invention has been made in view of such a problem, and an object of the present invention is to provide a soundproofing material exhibiting a new soundproofing function.
  • the soundproofing material according to the present invention for solving the above problems includes a first conductive ferromagnetic layer, a charged insulator layer, and a second conductive ferromagnetic layer, which are sequentially installed, and comprises the charged insulation.
  • the charged portion of the body layer, the first conductive ferromagnetic layer and the second conductive ferromagnetic layer are electrically insulated from each other, and the first conductive ferromagnetic layer and the charged insulator layer are subjected to sound waves.
  • the second conductive ferromagnetic layer vibrates, the magnetic field changes in the first conductive ferromagnetic layer and the second conductive ferromagnetic layer, and the energy of the sound wave is lost as thermal energy. It is characterized by soundproofing.
  • the magnetic field changes in the conductive ferromagnetic layer due to the vibration of the sound wave, and the energy of the sound wave is lost as thermal energy to reduce the energy of the sound wave and exert a soundproofing effect. it can.
  • FIG. 1 is a cross-sectional view of the soundproofing material according to the first embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the soundproofing material according to the first embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the soundproof and heat insulating material according to the second embodiment of the present invention.
  • FIG. 4 is an exploded perspective view of the soundproof and heat insulating material according to the second embodiment of the present invention.
  • the magnetic field is changed in the conductive ferromagnetic layer by sound waves to generate iron loss (magnetic loss) consisting of eddy current loss and hysteresis loss, and the energy of sound is converted into Joule heat and reduced. It is characterized by soundproofing by making it (lost as heat energy).
  • the soundproofing material 1 includes a first conductive ferromagnetic layer 10, a charged insulator layer 20, a second conductive ferromagnetic layer 35, and a seal frame 40 installed so as to cover the periphery thereof. Is equipped with. In FIG. 2, the seal frame 40 is omitted.
  • the first conductive ferromagnetic layer 10 and the second conductive ferromagnetic layer 35 are iron plates, but if it is a conductive ferromagnetic plate, for example, other materials such as nickel and ferrite may be used as appropriate. be able to.
  • a first gap layer 15 is formed between the first conductive ferromagnetic layer 10 and the charged insulator layer 20, and in the present embodiment, a silicon gel layer that adheres to both is installed.
  • the presence of the first gap layer 15 allows the first conductive ferromagnetic layer 10 and the charged insulator layer 20 to vibrate relatively.
  • the first gap layer 15 is flexible so that the first conductive ferromagnetic layer 10 and the charged insulator layer 20 can be relatively vibrated, has a high relative permittivity, and is a material of an insulator. , Other materials can be used as appropriate.
  • the first gap layer 15 may be used as an air layer, but a layer having a large dielectric breakdown strength is desirable, and a silicon rubber layer may be used.
  • the charged insulator layer 20 includes a first insulator layer 21, a first charged portion 22, and a second insulator layer 25, which are sequentially installed.
  • the first insulator layer 21 and the second insulator layer 25 are thin plates and are made of Kapton (registered trademark), which is a polyimide film having high heat resistance and high cold resistance.
  • the first charged portion 22 is a circular copper foil portion arranged in a rectangular lattice shape by forming a copper foil on the inner surface of the first insulator layer 21 by plating and then removing a predetermined portion by etching. To form.
  • the first conductive ferromagnetic layer 10 as the negative electrode, a high voltage is applied to each of these circular copper foil portions with contact pins to disconnect the connection, whereby a large number of positively charged circular charged regions 23 are formed. It is formed, and the first charged portion 22 is formed on the first insulator layer 21.
  • the second insulator layer 25 is attached to the first insulator layer 21 from above the first charged portion 22 and installed, so that the first charged portion 22 is installed with the first insulator layer 21 and the second insulator.
  • the charged insulator layer 20 sandwiched between the layers 25 is formed.
  • a second gap layer 30 is formed between the charged insulator layer 20 and the second conductive ferromagnetic layer 35 as in the first gap layer 15, and in this embodiment, a silicon gel layer is installed. ing. By forming the second gap layer 30, the charged insulator layer 20 and the second conductive ferromagnetic layer 35 can vibrate relatively. Similar to the first gap layer 15, the second gap layer 30 may be made of a soft insulating material.
  • the seal frame 40 is made of a conductive wire mesh or a metal sheet, and is integrated with the conductive ferromagnetic layers 10 and 35 to electrostatically shield the inside and the outside of the soundproofing material 1 and magnetically shield them.
  • the influence of the electric field due to the electric charge of the first charging portion 22 does not extend to the outside of the soundproofing material 1, and the influence of the magnetic field by the first charging portion 22 does not reach the outside of the soundproofing material 1.
  • seal frame 40 may not be installed separately, but may be configured to be electrostatically and magnetically shielded by bending the peripheral edges of the conductive ferromagnetic layers 10 and 35.
  • the soundproofing material 1 has, for example, a plate shape having a length of 20 cm and a width of 10 cm.
  • the thickness of the first conductive ferromagnetic layer 10 and the second conductive ferromagnetic layer 35 is 0.5 mm
  • the thickness of the first gap layer 15 and the second gap layer 30 is 1 mm
  • the thickness of the insulator layer 25 is 75 ⁇ m.
  • circles having a diameter of 4 mm are formed in a grid pattern at a pitch of 5 mm.
  • the plate-shaped first conductive ferromagnetic layer 10 vibrates in the thickness direction by sound waves and moves relative to the first charged portion 22. Therefore, in the first conductive ferromagnetic layer 10, the magnetic field changes and iron loss (eddy current loss and hysteresis loss) occurs, so that the energy of the sound wave is lost as thermal energy and the sound is reduced.
  • the sound wave transmitted through the first conductive ferromagnetic layer 10 reaches the charged insulator layer 20, and the charged insulator layer 20 vibrates in the thickness direction.
  • the magnetic field changes and iron loss occurs, so that the sound can be generated. Energy is reduced.
  • the sound wave transmitted through the charged insulator layer 20 reaches the second conductive ferromagnetic layer 35, and the second conductive ferromagnetic layer 35 vibrates in the thickness direction.
  • iron loss occurs in the second conductive ferromagnetic layer 35 that moves relative to the first charged portion 22, and the energy of sound waves is reduced.
  • the soundproofing material 1 when sound waves pass through the soundproofing material 1, the energy of the sound transmitted to the opposite side is attenuated due to sound absorption due to eddy current loss and hysteresis loss in the conductive ferromagnetic layers 10 and 35. , The soundproofing material 1 exhibits a great soundproofing effect.
  • the surface potential V of the first charging portion 22 is set in the gap layers 15 and 30. In terms of soundproofing performance, it is desirable to increase the size within a range that does not cause dielectric breakdown.
  • the manufacturing method of the soundproofing material 1 will be described.
  • the first gap layer 15 and the first insulator layer 21, which are silicon gel layers, are attached to and laminated on the first conductive ferromagnetic layer 10.
  • the first charged portion 22 is formed on one surface of the first insulator layer 21.
  • the second insulator layer 25 is bonded to the surface of the first insulator layer 21 on which the first charged portion 22 is formed, whereby the charged insulation having the first charged portion 22 electrically insulated inside is provided. Form the body layer 20.
  • the second gap layer 30 and the second conductive ferromagnetic layer 35 which are silicon gel layers, are sequentially attached and laminated on the second insulator layer 25 side of the charged insulator layer 20, and the seal frame 40 is installed. By doing so, the soundproofing material 1 is manufactured.
  • the vibration caused by the incoming sound changes the magnetic field in the conductive ferromagnetic layers 10 and 35 to generate iron loss, thereby converting the vibration into Joule heat.
  • it can exert a soundproofing function that reduces the energy of sound.
  • the soundproofing heat insulating material 2 includes a first conductive ferromagnetic layer 50, a first charged insulator layer 60, a second charged insulator layer 80, a second conductive ferromagnetic layer 90, and conductivity, which are sequentially installed. It includes a seal frame 95 installed on the periphery of the ferromagnetic layers 50 and 90. In FIG. 4, the seal frame 95 is omitted.
  • the first conductive ferromagnetic layer 50 and the second conductive ferromagnetic layer 90 are iron plates as in the first embodiment, and other materials can be used as appropriate.
  • the first charged insulator layer 60 is formed by charging the surface of the insulator, and includes a first insulator layer 61 and a first charged portion 62.
  • the first insulator layer 61 is made of a Kapton (registered trademark) film as in the first embodiment.
  • the first charged portion 62 forms a large number of aligned circular copper foil portions by forming a copper foil on one side surface of the first insulator layer 61 by plating and then removing a predetermined portion by etching.
  • the first conductive ferromagnetic layer 50 as a negative electrode and applying a high voltage to each of these circular copper foil portions with a contact pin to disconnect the connection, a large number of positively charged circular charged regions 63 are formed.
  • the first charged portion 62 is formed on one surface of the first insulator layer 61.
  • the second charged insulator layer 80 has the same configuration as the first charged insulator layer 60, and the second charged portion 82 (2) formed on one surface of the second insulator layer 81 and the second insulator layer 81 ( It has a circular charged region 83).
  • the first charged insulator layer 60 and the second charged insulator layer 80 are installed so as to face each other with the first charged portion 62 and the second charged portion 82 facing each other with the gap layer 70 of the vacuum layer interposed therebetween.
  • the gap layer 70 is formed by installing a spacer frame 71 made of silicon rubber between the first charged insulator layer 60 and the second charged insulator layer 80.
  • the inner surface of the first conductive ferromagnetic layer 50 and the outer surface of the first charged insulator layer 60 on which the first charged portion 62 is not formed are in close contact with each other. However, as shown in FIG. 3, the peripheral portion of the first conductive ferromagnetic layer 50 is thinned over the entire circumference, and the first conductive ferromagnetic layer 50 is prevented from interfering with the first charged insulator layer 60. A peripheral recess 51 having a concave inner surface is formed.
  • the second conductive ferromagnetic layer 90 is also formed with a peripheral recess 91 having a concave inner surface so as not to interfere with the second charged insulator layer 80.
  • the peripheral recesses 51 and 91 and the gap layer 70 By forming the peripheral recesses 51 and 91 and the gap layer 70, the first charged insulator layer 60 and the second charged insulator layer 80 can vibrate relatively in the thickness direction.
  • the pair of the first conductive ferromagnetic layer 50 and the first charged insulator layer 60 that are integrally adhered to each other is the first plate 100, and the second conductive ferromagnetic layer 90 and the second charged insulator that are integrally adhered to each other.
  • the pair with the layer 80 is the second plate 200
  • the first plate 100 and the second plate 200 are installed facing each other with the vacuum layer (gap layer 70) interposed therebetween, so that they are in a direction of approaching each other. Atmospheric pressure acts on.
  • first charged insulator layer 60 and the second charged insulator layer 80 are both positively charged with the same electric charge, the first plate 100 and the second plate 200 are separated from each other.
  • the repulsive force which is the Coulomb force, acts.
  • the Coulomb force does not depend on the length of the gap between the plane plates, but is determined by the surface charge density.
  • the Coulomb force is the length of the gap between the first plate 100 and the second plate 200 ( Depending on the length of the gap between the first charged insulator layer 60 and the second charged insulator layer 80), when the gap length changes, the repulsive force acting between the two changes.
  • the gap length and the repulsive force have a relationship in which the repulsive force monotonously decreases as the gap length increases.
  • the first plate 100 and the second plate 200 bend inward or outward in response to the change in the atmospheric pressure, resulting in a gap length. Changes, and Coulomb's repulsive force changes so that it always follows the atmospheric pressure and balances.
  • the peripheral recesses 51 and 91 are formed on the inner peripheral surfaces of the conductive ferromagnetic layers 50 and 90, and the peripheral portions of the charged insulator layers 60 and 80 are not in close contact with each other.
  • the peripheral portions of the insulator layers 60 and 80 are easily deformed, and it is easy to follow the change of the atmospheric pressure.
  • the seal frame 95 is made of a conductive wire mesh or a metal sheet, and is integrated with the conductive ferromagnetic layers 50 and 90 to connect the inside and the outside of the soundproof heat insulating material 2. Electrostatic shielding and magnetic shielding. In order to achieve good electrostatic shielding, it is desirable to ground the conductive ferromagnetic layers 50 and 90 when installing the soundproofing and heat insulating material 2.
  • the soundproof and heat insulating material 2 has, for example, a plate shape having a length of 20 cm and a width of 10 cm.
  • the thickness of the first conductive ferromagnetic layer 50 and the second conductive ferromagnetic layer 90 is 0.5 mm
  • the thickness of the first insulator layer 61 and the second insulator layer 81 is 50 ⁇ m
  • the thickness of the gap layer 70 is. It is 0.8 mm.
  • the circular charged regions 63 and 83 are formed by arranging a large number of circles having a diameter of 2 mm in a regular triangular lattice pattern (staggered pattern) at a pitch of 2.5 mm.
  • the action of the soundproofing and heat insulating material 2 will be described.
  • the sound wave is incident on the soundproof and heat insulating material 2 from the left side in the drawing.
  • the first plate 100 first conductive ferromagnetic layer 50 and the first charged insulator layer 60
  • the second plate 200 second conductive ferromagnetic layer 60
  • the body layer 90 and the second charged insulator layer 80 vibrate in the thickness direction.
  • the magnetic field changes and iron loss (eddy current loss and hysteresis loss) occurs, so that sound waves are generated. Energy is lost as heat energy.
  • the ratio of the surface potentials V ⁇ d / ⁇ 0 ⁇ s (d: thickness of insulator, ⁇ 0 : dielectric constant of vacuum, ⁇ s : Capton (registered trademark)) of the charged portions 62, 82 in the second embodiment.
  • d is 0.050 mm (the thickness of the insulator layers 61 and 81 is 50 ⁇ m), so the surface potential.
  • the average V 4154 [V].
  • the surface charge density ⁇ is large and there is no medium for transmitting the sparse and dense wave in the vacuum portion, so that the soundproofing performance can be further improved.
  • the gap layer 70 is a vacuum layer, it is possible to suppress heat convection and conduction and exhibit a high heat insulating function.
  • the vacuum layer is maintained by using the repulsive force, which is a Coulomb force, without installing a core material such as a spacer in the gap layer 70, and a simple structure can be realized and the core material can be realized. High heat insulation performance can be exhibited without heat conduction being performed through the.
  • the repulsive force which is a Coulomb force
  • the manufacturing method of the soundproof and heat insulating material 2 will be described.
  • the first conductive ferromagnetic layer 50 is attached to the outside of the first charged insulator layer 60 and laminated, and the second conductive ferromagnetic layer 90 is attached to the outside of the second charged insulator layer 80. They are laminated to form a first plate 100 and a second plate 200.
  • the first plate 100 and the second plate 200 are bonded together with the spacer frame 71 sandwiched between them.
  • the gap layer 70 formed by the spacer frame 71 is used as a vacuum layer, the charging work and the bonding work of the circular charging regions 63 and 83 are performed in the vacuum chamber.
  • the gap layer 70 is sealed by the spacer frame 71. Subsequently, by installing the seal frame 95, the soundproof and heat insulating material 2 is manufactured.
  • the vibration caused by the incoming sound changes the magnetic field in the conductive ferromagnetic layers 50 and 90 to generate iron loss, thereby causing the vibration to Joule heat. It can exhibit a soundproofing function that reduces the energy of sound by converting it to. Further, in the soundproof heat insulating material 2, the gap layer 70 is a vacuum layer, and a high heat insulating function can be exhibited.
  • the charging mode of the charged insulator that is, the shape, size, arrangement mode, arrangement pitch, etc. of the charged region can be changed as appropriate.
  • the shape of the charged region is preferably a circular shape, an elliptical shape, or a regular polygonal shape so that the charge is not biased.
  • the charged insulator may be negatively charged.
  • the charging method is not limited to ion implantation, and other charging methods such as triboelectric charging, peeling charging, induced charging, polarization, and coating of a charged body on an insulator can be appropriately adopted.
  • Second insulator layer 1 Soundproofing material 10 First conductive ferromagnetic layer 15 First gap layer 20 Charged insulator layer 21 First insulator layer 22 First charged part 23 Circular charging region 25 Second insulator layer 30 Second gap layer 35 Second Conductive ferromagnetic layer 40 Seal frame 2 Soundproof heat insulating material 50 First conductive ferromagnetic layer 51 Peripheral recess 60 First charged insulator layer 61 First insulator layer 62 First charged portion 63 Circular charged region 70 Gap layer (vacuum) layer) 71 Spacer frame 80 Second charged insulator layer 81 Second insulator layer 82 Second charged part 83 Circular charging region 90 Second conductive ferromagnetic layer 91 Peripheral recess 95 Seal frame 100 First plate 200 Second plate

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Laminated Bodies (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
PCT/JP2020/005527 2019-03-11 2020-02-13 防音材 Ceased WO2020184043A1 (ja)

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CN202080020000.1A CN113557176B (zh) 2019-03-11 2020-02-13 隔音件
US17/472,594 US12027148B2 (en) 2019-03-11 2021-09-11 Soundproof material

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JP2019-043314 2019-03-11
JP2019043314A JP7208504B2 (ja) 2019-03-11 2019-03-11 防音材

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CN117183487B (zh) * 2023-09-14 2024-06-21 广东华途仕建材实业有限公司 一种可拆组合式铝合金蜂窝板
CN120466038B (zh) * 2025-07-09 2025-09-12 杭州创博机械设备有限公司 基于多层复合结构的低噪声消音罩壳

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JP2020148789A (ja) 2020-09-17
US12027148B2 (en) 2024-07-02

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