CN110843288A - Automotive interior ceiling with high sound absorption and insulation performance - Google Patents

Automotive interior ceiling with high sound absorption and insulation performance Download PDF

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Publication number
CN110843288A
CN110843288A CN201911225418.1A CN201911225418A CN110843288A CN 110843288 A CN110843288 A CN 110843288A CN 201911225418 A CN201911225418 A CN 201911225418A CN 110843288 A CN110843288 A CN 110843288A
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CN
China
Prior art keywords
automotive interior
sound absorption
ceiling
film layer
insulation performance
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.)
Pending
Application number
CN201911225418.1A
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Chinese (zh)
Inventor
韦明
朱维珍
杜迎梅
隋健
许林
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.)
Yantai Zheng Hai He Tai Science And Technology Co Ltd
Original Assignee
Yantai Zheng Hai He Tai Science And Technology Co Ltd
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Priority to CN201911225418.1A priority Critical patent/CN110843288A/en
Publication of CN110843288A publication Critical patent/CN110843288A/en
Pending legal-status Critical Current

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    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • 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
    • B32B15/08—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 synthetic resin
    • B32B15/085—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 synthetic resin comprising polyolefins
    • 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
    • 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
    • B32B15/08—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 synthetic resin
    • B32B15/088—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 synthetic resin comprising polyamides
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
    • B60R13/0212—Roof or head liners
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/003—Interior finishings

Abstract

The invention discloses an automotive interior ceiling with high sound absorption and insulation performance, which is characterized in that the automotive interior ceiling is formed by bonding a back adhesive aluminum film, a lower glass fiber felt, a polyurethane foam board, an upper glass fiber felt, an upper non-woven fabric and a fabric from bottom to top by a polyurethane adhesive; the back adhesive aluminum film at least sequentially comprises a PA film layer, an aluminum foil film layer and a PE film layer, and the thicknesses of the PA film layer, the aluminum foil film layer and the PE film layer are respectively 10-15 um, 5-10 um and 20-60 um; by adopting the gum aluminum film, the sound absorption and insulation performance of the ceiling is improved, the noise in the cab is reduced, people in the vehicle are more comfortable and healthier in the driving process, and the vehicle type perception quality is improved.

Description

Automotive interior ceiling with high sound absorption and insulation performance
The technical field is as follows:
the invention relates to the technical field of automotive interior, in particular to an automotive interior ceiling with high sound absorption and insulation performance.
Background art:
the in-car noise refers to noise radiated to a passenger compartment by exciting structural vibration of each part of a car body through vibration transmission paths of each part of the car, and the noise generates a relatively complex reverberation sound field under the restriction of acoustic characteristics of the in-car space; noise in the vehicle can seriously affect the riding comfort, reduce the speech definition and damage the psychological and physiological health of drivers and passengers.
The automotive interior ceiling is installed under a roof metal plate, has important functions of blocking a transmission path of noise in the automobile and absorbing sound energy due to large area, and is one of the most important noise control interior parts in a cab.
The sound absorption performance of the existing automotive interior ceiling is mainly considered in the design of the existing automotive interior ceiling, a polyurethane foam board is generally used as a base material, as shown in fig. 2, a lower non-woven fabric 7, a lower glass fiber mat 5, a polyurethane foam board 4, an upper glass fiber mat 3, an upper non-woven fabric 2 and a fabric 1 are bonded in sequence, wherein the polyurethane foam board is provided with a large number of smile pores and holes which are communicated with the inside and the outside, and when noise enters the interior of the polyurethane foam board, sound energy is converted into heat energy due to the friction and viscous damping effect, and then the heat energy is dissipated.
Because the head space restriction in the car, the thickness of polyurethane foam board is generally very thin, and simultaneously, polyurethane foam's density is low, the percent opening is high, and the sound wave easily penetrates, leads to the interior noise can't pass through polyurethane foam effective absorption consumption.
Noise transmitted into the vehicle from the vehicle roof can easily penetrate through the ceiling and enter the cab, so that echo, reverberation and the like in the cab are caused.
The aluminum foil film has a sound insulation effect, and also has application in the field of automotive interior parts, and an engine cover with good sound insulation and high temperature resistance is described in patent CN201710877237.1 (published: 2018, 1, 23 and so on), and the engine cover has good sound absorption and sound insulation effects by utilizing the composite application of the honeycomb composite material layer and the sound insulation aluminum film layer.
The automotive interior ceiling belongs to the large-scale part in the cockpit, and the area is far greater than the engine shroud, and its structural design is also more complicated than the engine shroud, and traditional aluminium foil membrane hardness is big, easily tears, can only be applied to the part that the area is little, the profile is simple, can cause the large tracts of land to tear on being applied to the ceiling, the outward appearance defect such as bad.
The invention content is as follows:
the invention aims to overcome the technical problems and provide an automotive interior ceiling with high sound absorption and insulation performance; the problems that the existing ceiling material is poor in sound insulation performance and roof noise easily penetrates into a cockpit are mainly solved, and meanwhile, the sound wave is reflected and transmitted in a ceiling sound absorption layer, and the reverberation time in the cockpit is reduced.
The technical scheme provided by the invention is as follows: an automotive interior ceiling with high sound absorption and insulation performance is characterized in that the automotive interior ceiling is formed by bonding a back adhesive aluminum film, a lower glass fiber felt, a polyurethane foam board, an upper glass fiber felt, an upper non-woven fabric and a fabric from bottom to top by a polyurethane adhesive; the gum aluminium membrane include PA rete, aluminium foil rete and PE rete at least in proper order, PA rete, aluminium foil rete and PE rete thickness are 10~15um, 5~10um, 20~60um respectively.
According to the automotive interior ceiling with high sound absorption and insulation performance, the adhesive-backed aluminum film replaces the non-woven fabric layer to serve as the ceiling back layer, the reflection effect of the adhesive-backed aluminum film on sound waves is utilized, roof noise is effectively reflected and blocked to be transmitted into the cab, meanwhile, the adhesive-backed aluminum film can reflect the noise which is transmitted from the cab and passes through the polyurethane foam board back into the polyurethane foam board again, so that sound wave energy is fully dissipated, the sound absorption effect of the ceiling is improved, and the reverberation time in the cab is reduced.
The invention has the beneficial effects that:
1. the invention adopts the gum aluminum film, is different from the traditional sound insulation concept of the aluminum foil film for the automotive interior, mainly utilizes the reflection effect of the aluminum foil film on sound waves to improve the sound absorption and insulation performance of the ceiling, utilizes plastic materials such as PA and PE and the like to form a sandwich structure with the aluminum foil film, reduces the thickness of the gum aluminum film as much as possible, improves the whole ductility, avoids the defects of tearing of the material, poor appearance and the like, and has the value of further popularization and application; 2. the sound insulation performance of the ceiling is obviously improved, and the insertion loss of the noise transmitted into the roof is improved by 4-6 dB; 3. the sound absorption performance of the ceiling is obviously improved, and the Noise Reduction Coefficient (NRC) reaches above 0.60; 4. through the improvement of sound absorption and insulation performance, the noise level in the cockpit is reduced, the voice definition is improved, and the sound absorption and insulation device plays an important role in creating an ultra-silent environment in the vehicle.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a conventional structure of an interior trim ceiling of an automobile;
FIG. 3 is a schematic view of the structure of an aluminum film with adhesive backing of the present invention;
fig. 4 is a graph comparing the sound insulation performance of the ceiling of the present invention with that of the conventional ceiling;
fig. 5 is a graph comparing the sound absorption performance of the ceiling of the present invention with that of the conventional ceiling.
The specific implementation mode is as follows:
for a better understanding and appreciation of the invention, the following detailed description of the invention is given in conjunction with the accompanying drawings; the examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
Example 1, referring to fig. 1 and 3, an automotive interior ceiling with high sound absorption and insulation performance is formed by sequentially placing an aluminum adhesive-backed film 6, a lower glass fiber mat 5, a polyurethane foam board 4, an upper glass fiber mat 3, an upper non-woven fabric 2 and a fabric 1 from bottom to top, and bonding six layers of materials by a polyurethane adhesive through mould pressing; the back adhesive aluminum film 6 structure is composed of three layers of a PA film layer 8, an aluminum foil film layer 9 and a PE film layer 10, and the thicknesses of the PA film layer 8, the aluminum foil film layer 9 and the PE film layer 10 are respectively 12um, 10um and 30 um; the PE film layer 10 of the adhesive-backed aluminum film 6 faces the lower glass fiber mat 5.
In the comparative example, the automotive interior ceiling with the traditional structure is formed by placing a lower non-woven fabric 7, a lower glass fiber felt 5, a polyurethane foam plate 4, an upper glass fiber felt 3, an upper non-woven fabric 2 and a fabric 1 from bottom to top and bonding eight layers of materials together through mould pressing.
As can be seen from fig. 4 and 5, the automotive interior ceiling having high sound absorption and insulation performance of the present invention is superior to the automotive interior ceiling of the conventional structure in both sound insulation performance and sound absorption performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. An automotive interior ceiling with high sound absorption and insulation performance is characterized by being formed by bonding an adhesive-backed aluminum film (6), a lower glass fiber felt (5), a polyurethane foam board (4), an upper glass fiber felt (3), an upper non-woven fabric (2) and a fabric (1) from bottom to top by a polyurethane adhesive; the gum aluminium membrane include PA rete (8), aluminium foil rete (9) and PE rete (10) at least in proper order, PA rete (8), aluminium foil rete (9) and PE rete (10) thickness are 10~15um, 5~10um, 20~60um respectively.
CN201911225418.1A 2019-12-04 2019-12-04 Automotive interior ceiling with high sound absorption and insulation performance Pending CN110843288A (en)

Priority Applications (1)

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CN201911225418.1A CN110843288A (en) 2019-12-04 2019-12-04 Automotive interior ceiling with high sound absorption and insulation performance

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Application Number Priority Date Filing Date Title
CN201911225418.1A CN110843288A (en) 2019-12-04 2019-12-04 Automotive interior ceiling with high sound absorption and insulation performance

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115320190A (en) * 2021-05-11 2022-11-11 镇江市至善新材料科技有限公司 Layered structure acoustic metamaterial for broadband sound absorption and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948660A (en) * 1988-02-01 1990-08-14 Isover Saint-Gobain Heat and sound insulating panel
US20130164528A1 (en) * 2011-12-21 2013-06-27 Kasal Kogyo Co., Ltd. Interior material for vehicle
CN106188941A (en) * 2016-07-15 2016-12-07 无锡市天聚科技有限公司 A kind of roof of the vehicle base material and preparation method thereof
CN106828343A (en) * 2016-12-27 2017-06-13 柳州市金岭汽车配件厂 Vehicle dormer window ceiling cotton
CN208085165U (en) * 2018-03-22 2018-11-13 上海工程技术大学 A kind of bireflectance noise reduction heat-insulating composite panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948660A (en) * 1988-02-01 1990-08-14 Isover Saint-Gobain Heat and sound insulating panel
US20130164528A1 (en) * 2011-12-21 2013-06-27 Kasal Kogyo Co., Ltd. Interior material for vehicle
CN106188941A (en) * 2016-07-15 2016-12-07 无锡市天聚科技有限公司 A kind of roof of the vehicle base material and preparation method thereof
CN106828343A (en) * 2016-12-27 2017-06-13 柳州市金岭汽车配件厂 Vehicle dormer window ceiling cotton
CN208085165U (en) * 2018-03-22 2018-11-13 上海工程技术大学 A kind of bireflectance noise reduction heat-insulating composite panel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
谢水生，刘静安、徐俊等: "《简明铝合金加工手册》", 31 December 2016, 冶金工业出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115320190A (en) * 2021-05-11 2022-11-11 镇江市至善新材料科技有限公司 Layered structure acoustic metamaterial for broadband sound absorption and preparation method thereof

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