CN207828169U - Multifunctional sound insulation film and apply its insulation material layer - Google Patents
Multifunctional sound insulation film and apply its insulation material layer Download PDFInfo
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Abstract
The utility model provides a kind of Multifunctional sound insulation film and applies its insulation material layer, is related to functional film technical field.The Multifunctional sound insulation film, by the way that anti-scratch layer, the first base material layer, sound insulation glue-line, the second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film are complex as a whole to obtain, the acoustic film structure design is simple, has the function of good sound insulation, heat-insulated, ultraviolet radiation resisting, anti-scratch and other effects are also had both, the situation that type existing for existing sound control glass is single, expensive, construction is complicated is improved.The utility model additionally provides a kind of insulation material layer, including above-mentioned Multifunctional sound insulation film, the insulation material layer can be acoustic film, sound control glass, sound insulation building materials etc., due to including above-mentioned Multifunctional sound insulation film, therefore the insulation material layer also has the function of good sound insulation, while also there are the effectiveness such as heat-insulated, uvioresistant, anti-scratch.
Description
Technical field
The utility model is related to functional film technical fields, in particular to a kind of Multifunctional sound insulation film and answer
With its insulation material layer.
Background technology
With the process of urbanization, city noise pollution has become influences health of people and high-quality after air pollution
One big obstacle of life, oneself is put into one of the three overall situation public hazards that the world today influences human survival state.Noise in environment
Main source include traffic noise, social noise and man-made noise etc..Above-mentioned noise pollution to the psychology and physiology of people all
It will produce undesirable influence.Therefore noise problem is that field of environment engineering is badly in need of the important topic solved.
Currently, to solve the above problems, the acoustical insulation products such as sound control glass are come into being.Sound control glass is typically double-deck or more
The laminated glass of layer composite construction, the sound-proof damping glue (film) among laminated glass play pass to the reduction and decaying of sound transmission
Key acts on.But sound control glass on the market has that product category is single, expensive, construction complexity.
In view of this, special propose the utility model.
Utility model content
First of the utility model is designed to provide a kind of Multifunctional sound insulation film, by by anti-scratch layer, first
Substrate layer, sound insulation glue-line, the second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film are complex as a whole to obtain, the acoustic film
Structure design is simple, has the function of good sound insulation, also has both heat-insulated, ultraviolet radiation resisting, anti-scratch and other effects, improves existing
There is the situation that type existing for sound control glass is single, expensive, construction is complicated.
Second of the utility model is designed to provide a kind of insulation material layer, which has thin with sound insulation
The identical advantage of film.
In order to realize that the above-mentioned purpose of the utility model, spy use following technical scheme：
The utility model provides a kind of Multifunctional sound insulation film, including anti-scratch layer, the first base material layer, sound insulation glue-line, the
Two substrate layers, ultraviolet-resistant pressure-sensitive adhesive layer and release film；
The anti-scratch layer and sound insulation glue-line are respectively arranged on two opposite surface of the first base material layer, the acoustic mastic
Layer sets gradually the second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release from inside to outside on a surface far from the first base material layer
Film, above layers are complex as a whole successively.
Further, on the basis of the technical solution of the utility model, the sound insulation glue-line is to contain hollow beads
Sound insulation glue-line.
Further, on the basis of the technical solution of the utility model, the hollow beads are hollow ceramic microballon
Or hollow glass microbead.
Further, on the basis of the technical solution of the utility model, the average grain diameters of the hollow beads is 2~
30 μm, wall thickness is 0.2~3 μm.
Further, on the basis of the technical solution of the utility model, the thickness of the anti-scratch layer is 1~7 μm.
Further, on the basis of the technical solution of the utility model, the thickness of the sound insulation glue-line is 5~50 μ
m。
Further, on the basis of the technical solution of the utility model, the thickness of the first base material layer is 12~
200 μm, the thickness of second substrate layer is 12~200 μm.
Further, on the basis of the technical solution of the utility model, the thickness of the ultraviolet-resistant pressure-sensitive adhesive layer
It is 6~25 μm.
Further, on the basis of the technical solution of the utility model, the thickness of the release film is 12~50 μm.
The utility model additionally provides a kind of insulation material layer, including above-mentioned Multifunctional sound insulation film.
Compared with prior art, Multifunctional sound insulation film provided by the utility model and have using its insulation material layer
Following advantageous effect：
(1) the utility model provides a kind of Multifunctional sound insulation film, by by anti-scratch layer, the first base material layer, sound insulation
Glue-line, the second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film are complex as a whole to obtain, the acoustic film structure design letter
It is single, have the function of good sound insulation, also have both heat-insulated, ultraviolet radiation resisting, anti-scratch and other effects, improves existing sound control glass
Single, expensive, construction the is complicated situation of existing type.
(2) the utility model provides a kind of insulation material layer, including above-mentioned Multifunctional sound insulation film.The acoustic material
Layer can be acoustic film, sound control glass, sound insulation building materials etc..Due to comprising above-mentioned Multifunctional sound insulation film, therefore the acoustic material
Layer also has the function of good sound insulation, while also having the effectiveness such as heat-insulated, uvioresistant, anti-scratch.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the Multifunctional sound insulation film of the utility model.
Icon：10- anti-scratch layers；21- the first base material layers；The second substrate layers of 22-；30- sound insulation glue-lines；40- ultraviolet-resistants
Pressure-sensitive adhesive layer；50- release films.
Specific implementation mode
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
The every other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality
Novel protected range.
In the description of the present invention, it should be noted that the orientation of the instructions such as term "upper", " lower section ", " side "
Or position relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model and simplification is retouched
It states, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration and operation,
Therefore it should not be understood as limiting the present invention.
One side according to the present utility model, as shown in Figure 1, a kind of Multifunctional sound insulation film is provided, including it is anti-zoned
Hinder layer 10, the first base material layer 21, sound insulation glue-line 30, the second substrate layer 22, ultraviolet-resistant pressure-sensitive adhesive layer 40 and release film 50；
Anti-scratch layer 10 and sound insulation glue-line 30 are respectively arranged on two opposite surfaces of the first base material layer 21, sound insulation glue-line
The second substrate layer 22, ultraviolet-resistant pressure-sensitive adhesive layer 40 are set gradually from inside to outside on 30 surfaces far from the first base material layer 21
With release film 50, above layers are complex as a whole successively.
Multifunctional sound insulation film provided by the utility model, by by anti-scratch layer 10, the first base material layer 21, sound insulation glue-line
30, the second substrate layer 22, ultraviolet-resistant pressure-sensitive adhesive layer 40 and release film 50 are complex as a whole to obtain, wherein in sound insulation glue-line 30
Using the hollow beads with good sound insulation, insulative properties, ultraviolet absorber is used in ultraviolet-resistant pressure-sensitive adhesive layer 40, may make
The acoustic film has the function of good sound insulation, while also having both heat-insulated, ultraviolet radiation resisting, anti-scratch and other effects, it improves
Single, expensive, construction the is complicated situation of type existing for existing sound control glass.
Wherein, sound insulation glue-line 30 is the glue-line that deadening is played in the Multifunctional sound insulation film.Sound insulation glue-line 30 is main
Raw material includes adhesive, curing agent, hollow beads, ultraviolet absorber, dispersant and solvent.
Hollow beads are the functional materials in the sound insulation glue-line 30, and hollow beads have light, low heat conduction, intensity high, high
The advantages that dispersion, good fluidity and good chemical stability, has oleophylic, hydrophobicity performance by specially treated, is very easy to
It is scattered in the organic materials such as resin, because the inside of hollow beads is thin gas, it has sound insulation, heat-insulated spy
Property, it is the splendid filler as various heat preservations, acoustical insulation products.
In a kind of preferred embodiment of the utility model, hollow beads can be hollow glass microbead, or
Hollow ceramic microballon can also be the mixing of hollow glass microbead and hollow ceramic microballon.
In general, the average grain diameter of hollow beads used by the utility model is 2~30 μm, wall thickness is 0.2~3 μ
m。
The typical but non-limiting average grain diameter of hollow beads be 2 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm,
15 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 25 μm, 26 μm, 28 μm or 30 μm.The typical but non-limiting wall of hollow beads
Thickness be 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.8 μm,
2.0 μm, 2.2 μm, 2.4 μm, 2.5 μm, 2.6 μm, 2.8 μm or 3.0 μm.
Ultraviolet-resistant pressure-sensitive adhesive layer 40 can effectively slow down the photodegradation of external ultraviolet light and with lasting purple
Outer barriering effect so that the service life of the acoustic film is accordingly extended.Ultraviolet-resistant pressure-sensitive adhesive layer 40 is mainly by following
Raw material is made：Adhesive, curing agent, ultraviolet absorber and solvent.Ultraviolet absorber can be obviously improved the absorption of the acoustic film
The ability of ultraviolet light.
On above-mentioned technical proposal basis, in order to improve the scratch resistance capability of the acoustic film, it is additionally provided with anti-scratch layer
10.Anti-scratch layer 10 is mainly made of following raw material：Scraping-resistant agent and solvent.
The element of the first base material layer 21 and the second substrate layer 22 as the acoustic film.
In a kind of preferred embodiment of the utility model, the first base material layer 21 is selected from polyester film, polycarbonate membrane, poly- first
Any one in base methyl acrylate film, polyimide film or polyurethane film.
In a kind of preferred embodiment of the utility model, the second substrate layer 22 is selected from polyester film, polycarbonate membrane, poly- first
Any one in base methyl acrylate film, polyimide film or polyurethane film.
The first base material layer 21 is identical as the thickness of the second substrate layer 22, or different；The thickness of sound insulation glue-line 30 with it is ultraviolet
The thickness for obstructing pressure-sensitive adhesive layer 40 is identical, or different.
The thickness of Multifunctional sound insulation film can be set according to actual needs.A kind of preferred reality as the utility model
Mode is applied, the thickness of Multifunctional sound insulation film is 48~532 μm.
The typical but non-limiting thickness of Multifunctional sound insulation film be 48 μm, 50 μm, 60 μm, 70 μm, 90 μm, 100 μm,
120μm、150μm、180μm、200μm、220μm、240μm、250μm、280μm、300μm、320μm、350μm、380μm、400μ
M, 420 μm, 450 μm, 480 μm, 500 μm, 520 μm or 532 μm.
Preferably, the thickness of anti-scratch layer is 1~7 μm；The thickness of the first base material layer is 12~200 μm；Sound insulation glue-line
Thickness is 5~50 μm；The thickness of second substrate layer is 12~200 μm；The thickness of ultraviolet-resistant pressure-sensitive adhesive layer is 6~25 μm；From
The thickness of type film is 12~50 μm.
The typical but non-limiting thickness of anti-scratch layer is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm or 7 μm；The first base material layer
Typical but non-limiting thickness is 12 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μ
M, 120 μm, 150 μm, 160 μm, 180 μm or 200 μm；The typical but non-limiting thickness of sound insulation glue-line be 5 μm, 7 μm, 8 μm, 10
μm, 12 μm, 15 μm, 20 μm, 30 μm, 40 μm or 50 μm.The typical but non-limiting thickness of second substrate layer be 12 μm, 20 μm,
30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 120 μm, 150 μm, 160 μm, 180 μm or 200 μm；It is ultraviolet
Obstruct the typical but non-limiting thickness of pressure-sensitive adhesive layer be 6 μm, 7 μm, 8 μm, 10 μm, 12 μm, 15 μm, 16 μm, 18 μm, 20 μm,
22 μm, 24 μm or 25 μm；The typical but non-limiting thickness of release film is 12 μm, 20 μm, 30 μm, 40 μm or 50 μm.
The preparation method of above-mentioned Multifunctional sound insulation film, includes the following steps：
(a) mixed material for forming sound insulation glue-line 30 is prepared：By the adhesive of formula ratio, curing agent, hollow beads, ultraviolet
Absorbent, dispersant, solvent and optionally dyestuff or pigment mixing, obtain the sound insulation glue-line mixed material with certain viscosity；
(b) mixed material for forming ultraviolet-resistant pressure-sensitive adhesive layer 40 is prepared：By the adhesive of formula ratio, curing agent, ultraviolet
Absorbent and solvent mixing, obtain the ultraviolet-resistant pressure-sensitive adhesive layer mixed material with certain viscosity；
(c) mixed material for forming anti-scratch layer 10 is prepared：The scraping-resistant agent of formula ratio and solvent are mixed, obtain having one
Determine the anti-scratch layer mixed material of viscosity；
The sound insulation glue-line mixed material that step (a) obtains is coated on a surface of the first base material layer 21 and forms sound insulation
Glue-line 30；By a surface recombination of the second substrate layer 22 on sound insulation glue-line 30, the ultraviolet-resistant that step (b) is obtained is pressure-sensitive
Glue-line mixed material is coated on another surface of the second substrate layer 22, forms ultraviolet-resistant pressure-sensitive adhesive layer 40；It will be release
Film 50 is compounded in the surface of ultraviolet-resistant pressure-sensitive adhesive layer 40；The anti-scratch layer mixed material that step (c) is obtained is coated in first
Anti-scratch layer 10 is formed on another surface of substrate layer 21, i.e., above layers is complex as a whole, it is thin to obtain Multifunctional sound insulation
Film.
The preparation method of Multifunctional sound insulation film provided by the utility model is simple to operation, is firmly combined between each layer,
Using very convenient, in use, after the outermost layer of release film 50 is removed, it is pasted onto vehicle glass or glass of building surface,
It can sound insulation, moreover it is possible to which heat-insulated and barrier ultraviolet light, and scratch resistance have longer service life.
The utility model additionally provides a kind of insulation material layer, which includes that above-mentioned Multifunctional sound insulation is thin
Film.
The insulation material layer can be acoustic film, sound control glass, sound insulation building materials etc..Due to including above-mentioned Multifunctional sound insulation
Film, therefore the insulation material layer also has the function of good sound insulation, while also there are the effectiveness such as heat-insulated, uvioresistant, anti-scratch.
In order to further verify the effect of the utility model acoustic film, ad hoc following embodiment.
Embodiment 1
A kind of Multifunctional sound insulation film provided in this embodiment, including anti-scratch layer, the first base material layer, sound insulation glue-line,
Two substrate layers, ultraviolet-resistant pressure-sensitive adhesive layer and release film；
Anti-scratch layer and sound insulation glue-line are respectively arranged on two opposite surface of the first base material layer, and sound insulation glue-line is far from
The second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film are set gradually on one surface of one substrate layer from inside to outside, it is above-mentioned
Each layer is complex as a whole successively.
The thickness of Multifunctional sound insulation film is 89 μm；Wherein, the thickness of anti-scratch layer is 2 μm；The first base material layer is transparent
Polyester film, thickness are 23 μm；The thickness of sound insulation glue-line is 10 μm；Second substrate layer is transparent polyester film, and thickness is 23 μm；
The thickness of ultraviolet-resistant pressure-sensitive adhesive layer is 8 μm；The thickness of release film is 23 μm.
Wherein, sound insulation glue-line is mainly made of the raw material of following mass fraction：Acrylic acid adhesive SAA1401
50.00wt%, aluminium acetylacetonate curing agent SAC12 0.60wt%, hollow ceramic microballon 20.00wt%, benzotriazole are ultraviolet
Absorbent T-571 0.60wt%, neopelex dispersant 0.02wt%, pigment 7.32wt%, ethyl acetate
14.30wt%, toluene 7.16wt%, the sum of above-mentioned each raw material are 100wt%.
Wherein, hollow ceramic microballon average grain diameter is 8 μm, and 0.8 μm of wall thickness, pigment is azo pigment, with pigment itself
For calculating benchmark, pigment is made of azo black 63.08wt%, azophosphine 5.33wt% and azophloxine 31.59wt%.
Ultraviolet-resistant pressure-sensitive adhesive layer is mainly made of the raw material of following mass fraction：Acrylic acid adhesive SAA1401
60.00wt%, aluminium acetylacetonate curing agent SAC12 0.72wt%, benzotriazole ultraviolet absorber T-571 0.72wt%,
Ethyl acetate 26.85wt% and toluene 11.71wt%.
Anti-scratch layer is mainly made of the raw material of following mass fraction：Polyurethane acrylates coating BW1001
50wt%, ethyl acetate 30wt% and toluene 20wt%.
Embodiment 2
A kind of Multifunctional sound insulation film provided in this embodiment, including anti-scratch layer, the first base material layer, sound insulation glue-line,
Two substrate layers, ultraviolet-resistant pressure-sensitive adhesive layer and release film；
Anti-scratch layer and sound insulation glue-line are respectively arranged on two opposite surface of the first base material layer, and sound insulation glue-line is far from
The second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film are set gradually on one surface of one substrate layer from inside to outside, it is above-mentioned
Each layer is complex as a whole successively.
The thickness of Multifunctional sound insulation film is 185 μm；Wherein, the thickness of anti-scratch layer is 5 μm；The first base material layer is polyamides
Imines film, thickness are 50 μm；The thickness of sound insulation glue-line is 25 μm；Second substrate layer is polycarbonate membrane, and thickness is 50 μm；
The thickness of ultraviolet-resistant pressure-sensitive adhesive layer is 15 μm；The thickness of release film is 40 μm.
Wherein, sound insulation glue-line is mainly made of the raw material of following mass fraction：Polyurethane tackifier CH219
60.00wt%, amino resins class curing agent MR818 0.60wt%, hollow glass microbead 15.00wt%, the ultraviolet suction of Benzophenone class
Receive agent 0.60wt%, neopelex dispersant 0.02wt%, pigment 6.50wt%, ethyl acetate 10.26wt%, first
Benzene 7.02wt%, the sum of above-mentioned each raw material are 100wt%.
Wherein, hollow ceramic microballon average grain diameter is 5 μm, and 0.6 μm of wall thickness, pigment is azo pigment, with pigment itself
For calculating benchmark, pigment is made of azo black 63.08wt%, azophosphine 5.33wt% and azophloxine 31.59wt%.
Ultraviolet-resistant pressure-sensitive adhesive layer is mainly made of the raw material of following mass fraction：Acrylic acid adhesive SAA1401
50wt%, aluminium acetylacetonate curing agent SAC12 1.0wt%, benzotriazole ultraviolet absorber T-571 0.5wt%, acetic acid second
Ester 26.85wt% and toluene 11.71wt%.
Anti-scratch layer is mainly made of the raw material of following mass fraction：Polyurethane acrylates coating BW1001
40wt%, ethyl acetate 40wt% and toluene 20wt%.
Experimental example 1
The performance of the multi-function membrane of embodiment 1 and the offer of embodiment 2 is detected by following standards and method：
(1) the solar film transmission measurement instrument (model LS103) for using Shenzhen Lin Shang Science and Technology Ltd.s, with reference to GB/T
The Multifunctional sound insulation film of 2680 pairs of embodiments 1 is detected；
(2) quadraphonic impedance tube (model 4206T) for using B＆K companies is based on passing with reference to ASTM E2611-09 index planes
Defeated matrix method carrys out the normal incidence acoustic transmission loss (oise insulation factor) of test film；
Wherein, the detection method of ultraviolet light rejection rate is GB/T 2680, and the detection method of infrared light rejection rate is GB/T
2680, the detection method of peel strength is GB/T 2792, and the detection method of anti-scratch layer hardness is GB/T 6739, specific such as table
Shown in 1：
The testing result of 1 Examples 1 and 2 of table
From table 1 it follows that the Multifunctional sound insulation film that the utility model embodiment 1 and embodiment 2 provide is in addition to tool
Have good soundproof effect, while also having the function of good heat-insulated, ultraviolet radiation resisting, anti-scratch etc..
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it
System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type.
Claims (10)
1. a kind of Multifunctional sound insulation film, which is characterized in that including anti-scratch layer, the first base material layer, sound insulation glue-line, the second base material
Layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film；
The anti-scratch layer and sound insulation glue-line are respectively arranged on two opposite surface of the first base material layer, and the sound insulation glue-line is remote
From setting gradually the second substrate layer, ultraviolet-resistant pressure-sensitive adhesive layer and release film from inside to outside on a surface of the first base material layer,
Above layers are complex as a whole successively.
2. Multifunctional sound insulation film according to claim 1, which is characterized in that the sound insulation glue-line is to contain hollow beads
Sound insulation glue-line.
3. Multifunctional sound insulation film according to claim 2, which is characterized in that the hollow beads are hollow ceramic microballon
Or hollow glass microbead.
4. Multifunctional sound insulation film according to claim 2, which is characterized in that the average grain diameter of the hollow beads is 2
~30 μm, wall thickness is 0.2~3 μm.
5. Multifunctional sound insulation film according to any one of claims 1-4, which is characterized in that the thickness of the anti-scratch layer
Degree is 1~7 μm.
6. Multifunctional sound insulation film according to any one of claims 1-4, which is characterized in that the thickness of the sound insulation glue-line
Degree is 5~50 μm.
7. Multifunctional sound insulation film according to any one of claims 1-4, which is characterized in that the first base material layer
Thickness is 12~200 μm, and the thickness of second substrate layer is 12~200 μm.
8. Multifunctional sound insulation film according to any one of claims 1-4, which is characterized in that the ultraviolet-resistant is pressure-sensitive
The thickness of glue-line is 6~25 μm.
9. Multifunctional sound insulation film according to any one of claims 1-4, which is characterized in that the thickness of the release film
It is 12~50 μm.
10. a kind of insulation material layer, which is characterized in that include Multifunctional sound insulation film described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721923527.7U CN207828169U (en) | 2017-12-29 | 2017-12-29 | Multifunctional sound insulation film and apply its insulation material layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721923527.7U CN207828169U (en) | 2017-12-29 | 2017-12-29 | Multifunctional sound insulation film and apply its insulation material layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207828169U true CN207828169U (en) | 2018-09-07 |
Family
ID=63391240
Family Applications (1)
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|---|---|---|---|
| CN201721923527.7U Active CN207828169U (en) | 2017-12-29 | 2017-12-29 | Multifunctional sound insulation film and apply its insulation material layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207828169U (en) |
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2017
- 2017-12-29 CN CN201721923527.7U patent/CN207828169U/en active Active
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