CN108384127A - A kind of preparation method of open cell type rubber acoustic board - Google Patents
A kind of preparation method of open cell type rubber acoustic board Download PDFInfo
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- CN108384127A CN108384127A CN201810200492.7A CN201810200492A CN108384127A CN 108384127 A CN108384127 A CN 108384127A CN 201810200492 A CN201810200492 A CN 201810200492A CN 108384127 A CN108384127 A CN 108384127A
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
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- 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
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
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- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
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- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08J2491/06—Waxes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/06—Sulfur
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
- C08K5/40—Thiurams, i.e. compounds containing groups
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- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
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Abstract
The invention belongs to sound barrier technical fields, concretely relate to a kind of preparation method of open cell type rubber acoustic board.Its method include by ethylene propylene diene rubber fully it is thin it is logical after in input mixer；It puts into activating agent, packing material, softening oil successively in mixer and is kneaded 10~14min, banbury rotating speed is 15~25r/min, and dump temperature is 130~150 DEG C；It is cooled to room temperature logical 4~6 times thin on input open mill, 10~33 parts by weight of blowing agent, 2.5~5.5 parts by weight vulcanizing agents and 2~5.5 parts by weight accelerating agents is added, are mixed to get rubber compound；By rubber compound through 25~40min of vulcanization, temperature is 155 DEG C, and pressure is 2~6Mpa, obtains open cell type rubber acoustic board.Acoustic board prepared by the full method has the characteristics that dissipation acoustic energy is efficient, shock resistance durability degree is good and full frequency band absorbs sound.
Description
Technical field
The invention belongs to sound barrier technical fields, concretely relate to a kind of preparation method of open cell type rubber acoustic board and answer
The acoustic barrier unit board made of the acoustic board.
Background technology
Transportation one of is the pillar industries of the national economy, and high-speed railway is minimus in China Transportation Industry
Core component, with the development that China's high ferro technology is maked rapid progress, train speed is constantly soaring, while Railway Vibration and making an uproar
The environmental problem that vocal cords come increasingly aggravates, and the resident of railway both sides is disturbed by it deeply.Improve civic living environment to have become currently
A vital task in city-building is assembled with sound barrier in more and more railway both sides.
The sound absorption cell board internal structure of traditional sound barrier is single, and sound-absorbing material mostly uses filling rock wool fibers, such suction
Sound plate can not achieve full frequency band sound absorption and require, and be easy to be influenced and aging by environment such as humidity, ultraviolet lights, the sound absorption of sound barrier
Effect can significantly reduce；In view of the above-mentioned problems, some sound barriers are absorbed sound using metal material such as aluminum fiber acoustic board, aluminum foam
Plate, such sound-absorbing material all has preferable sound absorbing performance in high, medium and low frequency area, but durability is poor, is easy to be rusted,
Production cost is higher, especially for the low frequency noise that the bullet train more than 200km/h generates when driving, generates fiercely
Pulsed air pressure loading, the structure and internal component impact force to sound barrier are extremely strong, easily sound barrier are caused to damage.
Invention content
That it is an object of the invention to provide a kind of dissipation acoustic energy is efficient, shock resistance durability degree is good and full frequency band sound absorption is opened
The preparation method of pass rubber acoustic board and the open cell type rubber acoustic board.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of preparation method of open cell type rubber acoustic board, it is characterised in that：Including
Step 1,100 parts by weight ethylene propylene diene rubbers are thin logical on a mill, it will the fully thin logical rear ethylene propylene diene rubber
It puts into mixer；
Step 2, put into successively in the mixer 5~9 parts by weight of activated doses, 40~100 parts by weight packing materials, 25~
55 parts by weight softening oils are kneaded 10~14min, the 15~25r/min of banbury rotating speed, 130~150 DEG C of dump temperature；
Step 3, the mixer are shut down, the polymeric material formed it inside is cooled to room temperature put into it is thin on open mill lead to 4~
6 times, and 10~33 parts by weight of blowing agent, 2.5~5.5 parts by weight vulcanizing agents and 2~5.5 parts by weight accelerating agents are sequentially added, it mixes
Rubber compound is obtained after closing uniformly；
The rubber compound is vulcanized 25~40min by step 4 on vulcanizing press, and the curing temperature of the vulcanizing press is
155 DEG C, 2~6Mpa of sulfide stress, the open cell type rubber acoustic board after being foamed and being vulcanized.
The additional technical feature for constituting a kind of preparation method of above-mentioned open cell type rubber acoustic board further includes：
--- in the step 1, the ethylene propylene diene rubber carries out 15 times thin logical work on the open mill；
--- in the step 2, after the softening oil of 25~55 parts by weight is added in the mixer, add 10~20
Parts by weight piezo-electric type auxiliary agent；
--- increase step 5 after the step 4, the open cell type rubber acoustic board containing piezo-electric type auxiliary agent is placed on electric field
In polarize, polarized electric field intensity be 5~10kV/mm, the polarization time be 10~30 minutes, the open cell type rubber after being polarized
Glue acoustic board；
--- the ethylene propylene diene rubber is low Mooney ethylene propylene diene rubber, Mooney viscosity ML1+4 100℃15~45, it is non-to fill
Oil；
The packing material is carbon black, and dosage is 45~65 parts by weight；
The softening oil is machine oil or paraffin oil, and dosage is 25~55 parts by weight；
The foaming agent is sodium bicarbonate and stearic mixture；Sodium bicarbonate dosage is 5~15 parts by weight, and stearic acid is used
Amount is 5~18 parts by weight；
The vulcanizing agent is the mixture of sulphur and cumyl peroxide, and sulfur consumption is 0. 5~1. 5 parts by weight, mistake
Oxidation diisopropylbenzene (DIPB) dosage is 2~4 parts by weight；
The accelerating agent is tetramethylthiuram disulfide and 2, the mixture of 2 '-dithio-bis-benzothiazoles, curing four
Methyl thiuram dosage be 1~2. 5 parts by weight, 2,2 '~dithio-bis-benzothiazole dosage be 1~3 parts by weight；
The activating agent is zinc oxide, and dosage is 4~6 parts by weight；
The piezo-electric type auxiliary agent is piezoelectric ceramic powder or barium titanate piezoelectric ceramics powder, and dosage is 10~20 weight
Part.
The present invention also provides a kind of cell board of the novel sound barrier prepared by the above method, technical solution is：
The cell board mainly by structural framing, is respectively arranged at 2 He of punching panel of inside and outside two sides of the structural framing
Beading backboard, the acoustic board being set between the punching panel and beading backboard are constituted, wherein the acoustic board is by right
It is required that the open cell type rubber acoustic board of the preparation method production described in 5；
The additional technical feature for constituting a kind of cell board of above-mentioned novel sound barrier further includes：
--- the punching panel and beading backboard are made of aluminium alloy, the sound absorption bore dia of the punching panel 25mm extremely
Between 45mm, punching density is 80/square metre to 120/square metre, and porosity is 35% to 55%；
--- the structural framing is made of aluminium alloy, and the left and right sides of the structural framing has docks convenient for cell board socket joint
Strip rectangle unfilled corner, the end socket being bent to the inside of the strip rectangle unfilled corner is arranged in edge inside and outside the structural framing
Piece；
--- structural framing upper and lower ends setting head cover and bottom plate, the head cover and bottom plate have card slot, for it is described
It is fixed inside and outside structural framing；
The present invention also provides a kind of novel sound barrier assembled by above-mentioned sound absorption cell board, technical solution is：
It is connected for I-shaped support keel by section between the adjacent structural framing, the left and right sides shape of the support keel
At the groove body for fixing the structural framing, the slot arm of the groove body is inserted into the strip rectangle unfilled corner, and by the envelope
Head piece occlusion, the support keel and the structural framing, head cover, the contact site of bottom plate and the head cover, bottom plate and institute
The contact site for stating structural framing is fixed with rivet.
A kind of preparation method of open cell type rubber acoustic board provided by the present invention compared with prior art, has following excellent
Point：First, due to the preparation method 100 parts by weight ethylene propylene diene rubbers by fully it is thin it is logical after put into mixing process, and
Sequentially add 5~9 parts by weight of activated doses, 40~100 parts by weight packing materials, 25~55 parts by weight softening oils, after mixing
It foams and vulcanizes on vulcanizing press, a large amount of open cell type holes are rich in the rubber acoustic board of formation, sound wave is generated good
Reflection, refraction and interference phenomenon, play the role of sqouynd absorption lowering noise, while rubber macromolecule chain, Neng Gou are formed inside rubber slab
Vibration and deformation are generated under sound wave effect, then frictional heat and sound energy consumption；Second, in mixer, in mixed material according to
After 25~55 parts by weight softening oils of secondary addition add, add 10~20 parts by weight piezo-electric type auxiliary agents, can by piezo-electric damping effect,
So that strand converts vibrational energy to electric energy, this electric energy is again by conducting particles while vibration and deformation（Such as carbon black）
Thermal dissipation is converted thereof into, has accomplished the various ways such as stomata deformation resonance, damping friction heat, the conversion of piezo-electric damping electric energy
Dissipation acoustic energy is provided with good absorbability to senior middle school's low-frequency sound wave；Third, the open cell type rubber produced by the preparation method
Acoustic board, structural strength is high, can accomplish that full frequency band sqouynd absorption lowering noise, the pulsed air pressure that especially anti-low-frequency noise generates carry
The impact of lotus, rubber material weather resistance is strong, is not afraid of wind and weather, heat-resisting, resistance to molten jelly, prevents fires and do not pollute the environment；Fourth,
The novel sound barrier assembled by open cell type rubber sound absorption version, production is easy, and quick for installation, short construction period uses the longevity
Life length, in high-speed railway both sides in use, its sqouynd absorption lowering noise has special effect.
Description of the drawings
Fig. 1 is the cross for the acoustic barrier unit board that the preparation method provided by the invention using open cell type rubber acoustic board produces
Cross section structure schematic top plan view；
Fig. 2 is the socket joint attachment structure schematic diagram of the cell board；
Fig. 3 is the vertical section structure schematic diagram for the novel sound barrier that the cell board is assembled into.
Specific implementation mode
Below further specifically to a kind of work of the preparation method of open cell type rubber acoustic board provided by the present invention
It is bright.
The step of preparation method for constituting the open cell type rubber acoustic board includes
Step 1,100 parts by weight ethylene propylene diene rubbers are thin logical on a mill, it will fully thin logical rear ethylene propylene diene rubber input
In mixer；
Step 2, put into successively in mixer 5~9 parts by weight of activated doses, 40~100 parts by weight packing materials, 25~55 weights
It measures part softening oil and is kneaded 10~14min, banbury rotating speed is 15~25r/min, and dump temperature is 130~150 DEG C；
Step 3, mixer are shut down, and the polymeric material formed inside it are cooled to room temperature thin by logical 4~6 on input open mill
It is secondary, and 10~33 parts by weight of blowing agent, 2. 5~5. 5 parts by weight vulcanizing agents and 2~5. 5 parts by weight accelerating agents are sequentially added,
Rubber compound is obtained after mixing；
Rubber compound is vulcanized 25~40min by step 4 on vulcanizing press, and the curing temperature of vulcanizing press is 155 DEG C, sulphur
Change 2~6Mpa of pressure, the open cell type rubber acoustic board after being foamed and being vulcanized.
Its working principle is that：100 parts by weight ethylene propylene diene rubbers by fully it is thin it is logical after put into mixing process, and according to
Secondary 5~9 parts by weight of activated doses of addition, 40~100 parts by weight packing materials, 25~55 parts by weight softening oils, flat after mixing
It foams and vulcanizes on plate vulcanizer, a large amount of open cell type holes are rich in the rubber acoustic board of formation, medium-high frequency sound wave is along this some holes
Gap is deeply internal, and friction, which occurs, with material converts acoustic energy to thermal energy, while having good damping sound absorbing mechanism, for sound wave
Reflection, refraction and interference phenomenon are generated, plays the role of sqouynd absorption lowering noise, rubber macromolecule chain is formed inside rubber slab, it can be in sound
Wave effect is lower to generate vibration and deformation, then frictional heat and sound energy consumption.
In the step of constituting a kind of preparation method of above-mentioned open cell type rubber acoustic board,
--- in order to improve the melting effect of rubber compound, make each component such as packing material, activator, anti-aging agent etc. in rubber compound
Component can be uniformly dispersed in subsequent handling step, and in step 1, ethylene propylene diene rubber carries out 15 times thin on a mill
Logical work；
--- in above-mentioned steps two, after the softening oil of 25~55 parts by weight is added in mixer, add 10~20 weight
Part piezo-electric type auxiliary agent, makes piezoelectricity auxiliary agent uniformly adequately be distributed in rubber compound, increases the piezoresistance of open cell type rubber acoustic board
Buddhist nun's effect；
--- increase step 5 after above-mentioned steps four, the open cell type rubber acoustic board containing piezo-electric type auxiliary agent is placed on electric field
In polarize, it is preferred that polarized electric field intensity be 5~10kV/mm, the polarization time be 10~30 minutes, after being polarized
Open cell type rubber acoustic board；
--- as a kind of preferable embodiment, above-mentioned ethylene propylene diene rubber is low Mooney ethylene propylene diene rubber, and Mooney is viscous
Degree is ML1+4 100℃15~45, it is non-oil-filled；Packing material is carbon black, and dosage is 45~65 parts by weight；Softening oil is machine oil or stone
Wax oil, dosage are 25~55 parts by weight；Foaming agent is sodium bicarbonate and stearic mixture, and sodium bicarbonate dosage is 5~15
Parts by weight, stearic acid dosage are 5~18 parts by weight；Vulcanizing agent is the mixture of sulphur and cumyl peroxide, sulfur consumption
For 0. 5~1.5 parts by weight, cumyl peroxide dosage is 2~4 parts by weight；Accelerating agent is tetramethylthiuram disulfide
With 2, the mixture of 2 '-dithio-bis-benzothiazoles, tetramethylthiuram disulfide dosage is 1~2. 5 parts by weight, 2,2 '
~dithio-bis-benzothiazole dosage is 1~3 parts by weight；Activating agent is zinc oxide, and dosage is 4~6 parts by weight；Piezo-electric type auxiliary agent
For piezoelectric ceramic powder or barium titanate piezoelectric ceramics powder, dosage is 10~20 parts by weight；
In production practices, the making step of above-mentioned rubber compound can also be：By the ethylene propylene diene rubber of 100 parts by weight in open mill
It is upper it is thin lead to 15 input mixers, put into successively the zinc oxide agent of 5 parts by weight, part carbon black of 40 weight, 25 weight paraffin oil
With part piezoelectric ceramic powder of 10 weight, it is kneaded 12 min, banbury rotating speed 20r/min, 135 DEG C of dump temperature is cold
But the sodium bicarbonate of 10 parts by weight, part stearic acid of 10 weight are sequentially added to thin 4 times logical on a mill after room temperature, 1.0
Part sulphur of weight, the cumyl peroxide of 2 parts by weight；The tetramethylthiuram disulfide of 1 parts by weight, 2 parts by weight
2,2 '~dithio-bis-benzothiazole；Rubber compound is obtained after mixing.
By the cell board of novel sound barrier prepared by the above method, technical solution is：
As shown in Figure 1, it is inside and outside to be respectively arranged at structural framing 1 mainly by structural framing 1 for a kind of cell board of novel sound barrier
The punching panel 2 and beading backboard of two sides, the acoustic board 4 being set between punching panel 2 and beading backboard 3 are constituted,
In, the acoustic board 4 is the open cell type rubber acoustic board produced by above-mentioned preparation method；
In constituting a kind of above-mentioned structure of the cell board of novel sound barrier,
--- above-mentioned punching panel 2 and beading backboard 3 are made of aluminium alloy, the sound absorption bore dia of punching panel 2 25mm extremely
Between 45mm, punching density is 80/square metre to 120/square metre, and porosity is 35% to 55%, has light quality, adds
Work is simple, absorbs the good feature of sound wave effect；
--- as shown in Fig. 2, in order to improve the integral strength of cell board, above structure frame 1 is made of aluminium alloy, structural framing
1 left and right sides has the strip rectangle unfilled corner 5 convenient for the docking of cell board socket joint, edge setting inside and outside structural framing 1
The head sealing sheet 6 being bent inside to strip rectangle unfilled corner 5 is convenient for cell board assembly and connection, is easy to construct；
--- head cover 7 and bottom plate 8 is arranged in 1 upper and lower ends of above structure frame, and head cover 7 and bottom plate 8 have card slot（71、81）, use
In be fixed inside and outside structural framing 1, improve the closed of cell board, increase the guarantor to internal sound absorbing member
Shield enhances the durability degree of sound absorption cell board；
By the novel sound barrier of above-mentioned open cell type rubber sound absorption cell board assembling, technical solution is：
--- as shown in figure 3, being connected for I-shaped support keel by section between adjacent above structure frame 1, support keel
The left and right sides form the groove body 91 for fixed structure frame 1, the slot arm 92 of groove body 91 is inserted into strip rectangle unfilled corner 5, and
It is engaged by head sealing sheet 6, support keel 9 and structural framing 1, head cover 7, the contact site of bottom plate 8 and head cover 7, bottom plate 8 and structure
The contact site of frame 1 use rivet 10 fix, the sound barrier have it is quick for installation, short construction period, structural strength is big, use
Long lifespan and the good feature of full frequency band sqouynd absorption lowering noise effect.
Claims (10)
1. a kind of preparation method of open cell type rubber acoustic board, it is characterised in that：Including
Step 1,100 parts by weight ethylene propylene diene rubbers are thin logical on a mill, it will the fully thin logical rear ethylene propylene diene rubber
It puts into mixer；
Step 2, put into successively in the mixer 5~9 parts by weight of activated doses, 40~100 parts by weight packing materials, 25~
55 parts by weight softening oils are kneaded 10~14min, and the banbury rotating speed is 15~25r/min, and dump temperature is 130~150 DEG C；
Step 3, the mixer are shut down, the polymeric material formed it inside is cooled to room temperature put into it is thin on open mill lead to 4~
6 times, and 10~33 parts by weight of blowing agent, 2. 5~5.5 parts by weight vulcanizing agents and 2~5.5 parts by weight accelerating agents are sequentially added, it mixes
Rubber compound is obtained after closing uniformly；
The rubber compound is vulcanized 25~40min by step 4 on vulcanizing press, and the curing temperature of the vulcanizing press is
155 DEG C, sulfide stress is 2~6Mpa, the open cell type rubber acoustic board after being foamed and being vulcanized.
2. a kind of preparation method of open cell type rubber acoustic board according to claim 1, it is characterised in that：In the step
In one, the ethylene propylene diene rubber carries out 15 times thin logical work on the open mill.
3. a kind of preparation method of open cell type rubber acoustic board according to claim 1, it is characterised in that：In the step
In two, after the softening oil of 25~55 parts by weight is added in the mixer, 10~20 parts by weight piezo-electric type auxiliary agents are added.
4. a kind of preparation method of open cell type rubber acoustic board according to claim 3, it is characterised in that：In the step
Four increase step 5, and the open cell type rubber acoustic board placement containing piezo-electric type auxiliary agent is polarized in the electric field, polarized electric field
Intensity is 5~10kV/mm, and the polarization time is 10~30 minutes, the open cell type rubber acoustic board after being polarized.
5. a kind of preparation method of open cell type rubber acoustic board according to claim 4, it is characterised in that：
The ethylene propylene diene rubber is low Mooney ethylene propylene diene rubber, Mooney viscosity ML1+4 100℃15~45, it is non-oil-filled；
The packing material is carbon black, and dosage is 45~65 parts by weight；
The softening oil is machine oil or paraffin oil, and dosage is 25~55 parts by weight；
The foaming agent is sodium bicarbonate and stearic mixture；Sodium bicarbonate dosage is 5~15 parts by weight, and stearic acid is used
Amount is 5~18 parts by weight；
The vulcanizing agent is the mixture of sulphur and cumyl peroxide, and sulfur consumption is 0.5~1.5 parts by weight, peroxide
Change diisopropylbenzene (DIPB) dosage is 2~4 parts by weight；
The accelerating agent is tetramethylthiuram disulfide and 2, the mixture of 2 '-dithio-bis-benzothiazoles, curing four
Methyl thiuram dosage be 1~2.5 parts by weight, 2,2 '~dithio-bis-benzothiazole dosage be 1~3 parts by weight；
The activating agent is zinc oxide, and dosage is 4~6 parts by weight；
The piezo-electric type auxiliary agent is piezoelectric ceramic powder or barium titanate piezoelectric ceramics powder, and dosage is 10~20 weight
Part.
6. a kind of cell board of novel sound barrier, it is characterised in that：The cell board mainly by structural framing, is respectively arranged at institute
It states the punching panel of inside and outside two sides of structural framing and beading backboard, is set between the punching panel and beading backboard
Acoustic board constitute, wherein the acoustic board be by described in claim 5 preparation method production open cell type rubber absorb sound
Plate.
7. a kind of cell board of novel sound barrier according to claim 6, it is characterised in that：The punching panel and beading
Backboard is made of aluminium alloy, the sound absorption bore dia of the punching panel 2 in 25mm between 45mm, punching density is 80/
Square metre to 120/square metre, porosity is 35% to 55%.
8. a kind of cell board of novel sound barrier according to claim 6, it is characterised in that：The structural framing is closed by aluminium
Gold is made, and the left and right sides of the structural framing has the strip rectangle unfilled corner convenient for the docking of cell board socket joint, the structural frames
The head sealing sheet being bent to the inside of the strip rectangle unfilled corner is arranged in edge inside and outside frame.
9. a kind of cell board of novel sound barrier according to claim 6, it is characterised in that：Two above and below the structural framing
End setting head cover and bottom plate, the head cover and bottom plate have card slot, for be fixed inside and outside the structural framing.
10. a kind of novel sound barrier, is assembled by the cell board described in claim 9, it is characterised in that：The adjacent structure
It is connected for I-shaped support keel by section between frame, the left and right sides of the support keel is formed for fixing the knot
The slot arm of the groove body of structure frame, the groove body is inserted into the strip rectangle unfilled corner, and is engaged by the head sealing sheet, the support
Keel and the structural framing, the contact site of head cover, the contact site of bottom plate and the head cover, bottom plate and the structural framing
Position is fixed with rivet.
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| CN201810200492.7A CN108384127A (en) | 2018-03-12 | 2018-03-12 | A kind of preparation method of open cell type rubber acoustic board |
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Address after: 053000 Hengshui city of Hebei Province North Taocheng District industrial base rubber road No. 1 Applicant after: Hengshui Zhongyu Tiexin Environmental Protection Engineering Co.,Ltd. Applicant after: HEBEI TONGCHUANG TRAFFIC ENGINEERING MATCHING PRODUCT INDUSTRY TECHNOLOGY Co.,Ltd. Address before: 053000 Hengshui city of Hebei Province North Taocheng District industrial base rubber road No. 1 Applicant before: HENGSHUI CRCPR ENVIRONMENTAL PROTECTION ENGINEERING Co.,Ltd. Applicant before: HEBEI TONGCHUANG TRAFFIC ENGINEERING MATCHING PRODUCT INDUSTRY TECHNOLOGY Co.,Ltd. |