CN108823814A - A kind of short fine production technology with melt-blown composite molding acoustical cotton - Google Patents
A kind of short fine production technology with melt-blown composite molding acoustical cotton Download PDFInfo
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- CN108823814A CN108823814A CN201810972209.2A CN201810972209A CN108823814A CN 108823814 A CN108823814 A CN 108823814A CN 201810972209 A CN201810972209 A CN 201810972209A CN 108823814 A CN108823814 A CN 108823814A
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- melt
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention discloses a kind of short fine production technologies with melt-blown composite molding acoustical cotton, it is compared with traditional technique, it mainly joined opening twice and air-flow mend wind conveying mechanism, twin-roll receives composite molding technique, equipment of the invention is advanced, simple process, control temperature is paid attention on the original basis, acoustical cotton obtained not only has light weight, sound-absorbing, sound insulation value is good, hydrophobicity is good, plasticity is good, fire-retardant equal excellent performances, and it is tasteless, waterproof, it is moisture-proof, permeability is good, soil resistant, antibacterial, to have broad application prospects and market value.
Description
Technical field
The invention belongs to Nonwovens In Technology fields, and in particular to a kind of short fine production with melt-blown composite molding acoustical cotton
Technique.
Background technique
Nowadays with the rapid development of the automotive industry, the production scale and production skill of automotive interior material are greatly improved
Art.And in automobile noise reduction packing material field, non-woven material using more and more extensive, be used as various automotive upholsteries,
Such as seat, the covering material of vehicle body baffle, roof base fabric and roof lining, car carpeting, luggage case lining.It is raw at present
Producing a car averagely needs to use 20m2Non-woven material, reduced mass about 15-20kg, wherein non-woven porous acoustic damping materials account for about
18% or so, and dosage is also continuing to increase.
With economic sustainable development and the continuous improvement of living standard, people to the safety of environment in car, relax
The requirement of appropriateness and the feature of environmental protection is also higher and higher.Light is just non-woven more in automobile, household electrical appliance and building to being widely used in
Hole acoustic damping materials propose higher quality standard, it is desirable that it is with efficient and light weight, environmental protection and the multiple functions such as fire-retardant.
Non-woven automotive acoutic fibre board material is also known as acoustical cotton, can be by high-frequency noises vibrational energy caused by body oscillating
The kinetic energy of the fine count fiber inside acoustical cotton is converted to, and is converted to thermal energy and disappears, reaches the function of absorbing sound and lowering noise.Currently,
Mainly there are glass fibre acoustical cotton and polyester fiber acoustical cotton in the market, although product is had nothing in common with each other, sound-absorbing effect is essentially the same,
But glass fibre is not environmentally, is not easy to construct.Although polyester fiber is low compared with the cost of glass fibre, the resistance of polyester fiber
Fire poor, inflammable, the more easy firing than timber.China's required non-woven automotive acoutic fibre board material annual at present is up to 8,000,000 m2It is left
The right side, body material used in the product are various fibers, add meldable fibre and are process, raw material sources it is relatively abundanter and
It is cheap, but this material sound-absorbing, soundproof effect are general, are relatively chiefly used in low and middle-grade cars.Later people begin one's study again
Various fire-retardant, sound-absorbings, soundproof effect are good, material resistant to high temperature, but this fiber crushing resistance is bad, and resilience and bulkiness are not
Height is difficult lasting sound-absorbing, if it is possible to the method and technique of these products be improved in the prior art, in conjunction in automobile
The characteristics of exterior material, explores the sound-absorbing method of sound insulation for being suitble to automotive interior material and technique such as non-woven cloth and certain metal materials
Or special material carries out compound, the addition for the functional group that resonates, Special Finishing of interior material etc. will all propose the suction of innings material significantly
Sound sound insulation value.Therefore seek preferably Process configuration for actual production practices, preparation function is improved to production technology
There are also to be solved than more comprehensive sound-absorbing material for property.
Summary of the invention
According to the above-mentioned deficiencies of the prior art, a kind of short fine multiple with melt-blown the technical problem to be solved by the present invention is to propose
The production technology of synthesis type acoustical cotton, it is short it is fine joined air-flow by twice opening and mend wind conveying mechanism, exempt from staple fiber because
For airflow field is unstable and mutually tangles, agglomerating, the uniformity that short fibre is mixed with meltblown fibers is improved, then by a constant current
Amount, speed, angle air-flow be delivered to melt-blown process, finally enter twin-roll receive composite molding reception device make to be meltblown it is compound
Material internal fiber is arranged perpendicular to web surface, is in tridimensional network, is increased the gap of material internal, improve its suction
Sound anti-acoustic capability.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of short fine production technology with melt-blown composite molding acoustical cotton, includes the following steps：
(1) PET staple fiber first combs networking, by thick shredding, smart shredding, is added to melt-blown by air-flow conveying by jet pipe
In the thermal current of technique, evenly dispersed composite fibre stream is formed, is gathered among twin-roll in the case where stretching air effect, up and down
Meltblown composites are made in surface bonded spunbond non-woven cloth；
(2) it after PP polymer chips heats extrusion molten by screw extruder, is filtered, it is accurate by metering pump
Meltblown beam component is reached after metering；
(3) after spinneret sprays, melt-blown micro fibre stream is formed in hot-air drafting system, is pulled down in high pressure blower
It stretches to form melt-blown silk, be mixed with the crimped staple being implanted in meltblown fiber stream, the effect by stretching air-flow keeps mixing fine
Dimension is deposited among twin-roll, and composite fibre and spun-bonded non-woven carry out upper and lower surface bonding, then to winding device；
(4) it most afterwards through cold wind cooling, rolling sizing, inspection, then cuts packing and gets product acoustical cotton.
Preferably, PET staple fiber described in step (1) is three-dimensional crimp PET Hollow staple fiber and the short fibre of flame-resistant terylene
Dimension is in single fiber state after combing networking.
Preferably, the cotton speed of feeding that short fine thick fibre-opening unit feeds cotton roller described in step (1) is 5.8-6.2m/min, feeds cotton
Mouth width degree is 1-1.2m.
Preferably, the melt index of PP polymer chips described in step (2) is 150-180g/min, in screw extruder
One 160-170 DEG C of area's temperature, two area's temperature are 170-180 DEG C, and 3rd area, 4th area, five area's temperature are 180-190 DEG C, screw rod
Revolving speed is 50-70rpm, diameter 105mm.
Preferably, the temperature of filter described in step (2) is 180-190 DEG C, and the precision of filter is 220-280 mesh,
Filter area is 1.5-2m2, the revolving speed of melt metering pump is 17-25rpm.
Preferably, meltblown beam component described in step (2) is by polymer melt distribution system, die system, stretching warm
Air line passageway and heating and thermal insulation original part composition, wherein die system is mainly by spinneret, melt flow distribution plate, melt filtration
Net, the engaging member of gas plate and group encapsulation, sealing element composition.
Preferably, hot-air drafting system described in step (3) is by roots blower, air heater, hot air delivery pipe
The composition such as road, wherein roots blower power is 110kw, and revolving speed 2900-3000r/min, hot air temperature is 210-220 DEG C,
Heat air pressure is 1.2-1.6MPa, and hot-air jet angle is 83-90 °.
Preferably, each area's temperature of the die system is 190-200 DEG C, and the temperature in each area of pipe passage is 180-
190 DEG C, spinneret single hole extrusion output is 0.5g/min, and the reception distance of die head spinning nozzle to reception device is 20-25cm.
Present invention has the advantages that:
1. polyester (PET) fiber sound-absorption coefficient is high, sound-absorbing frequency is wide, damping capacity is good, these features are all excellent sound-absorbings
Required for material.PET fiber initial modulus is high, has preferable mechanical property, bond strength height, weather resistance good, meanwhile,
PP has many advantages, such as that fusing point is lower, raw material is easy to get, density is small, nontoxic, impact strength and flex stiffiness are good, uses in the present invention
PET web of staple fibers controls the thickness and fluffy degree of entire sound-absorbing material, can not only play the role of fibrous skeleton or structural fibers,
Simultaneously preferable coordinative role can also be played with ultra-fine meltblown fibers.
2 costs of material of the present invention are low, simple production process, convenient for large-scale production, while have light weight, sound-absorbing, every
Sound performance is good, hydrophobicity is good, plasticity is good, the excellent performances such as fire-retardant, while tasteless, waterproof, moisture-proof, permeability is good, prevents
It stains, antibacterial, the class of domestic low and middle-grade cars can not only be promoted, and huge economic benefit and society's effect will be generated
Benefit.
3. present invention adds staple fiber openings twice and air-flow to mend wind conveying mechanism, twin-roll receives composite molding
Reception device；Opening and air-flow mend wind conveying mechanism and improve the uniformity that short fibre is mixed with meltblown fibers, improve final produce
The sound absorption qualities of product；It using twin-roll reception device, arranges meltblown composites internal fiber perpendicular to web surface, is in three
Reticular structure is tieed up, increases the gap of material internal, the perfect compression resilience of material improves its absorbing sound and lowering noise performance；
PET/PP disperses the three-dimensional fibre web upper and lower surface of compound melt-blown and viscose non-woven material bonds, and product upper and lower surface can be kept clear
It is clean.
4. critical component of the short fine conveying jet pipe as short fine air-flow conveying in the present invention, for it is short it is fine convey provide one compared with
For stable airflow field, avoids staple fiber from mutually tangling, agglomerating etc. because airflow field is unstable, make short fibre with single fiber as far as possible
State, equably incorporate melt-blown process airflow field, improve staple fiber in the product be uniformly distributed and sound absorption qualities.
It is environment-friendly products, recoverable 5. technique does not add any auxiliary agent, adhesive in process of production.
Detailed description of the invention
Content expressed by this specification attached drawing and the label in figure are briefly described below：
Fig. 1 is the short fine production technological process with melt-blown composite molding acoustical cotton.
Specific embodiment
It below by the description to embodiment, is described in further detail, to help those skilled in the art to this hair
Bright inventive concept, technical solution have more complete, accurate and deep understanding.
Embodiment 1
1. taking three-dimensional crimp PET Hollow staple fiber and flame retardant polyester staple fibre, diameter is 25 μm, and length 60mm is first combed
Manage into single fiber state.
2. the staple fiber combed is put into fibre-opening unit to feed in cotton roller, feeding cotton speed is 5.8m/min, cotton feeding port width
For 1m, through thick shredding, smart shredding shredding twice.
3. being added in the thermal current of melt-blown process by jet pipe by air-flow conveying, evenly dispersed composite fibre is formed
Stream, is gathered among twin-roll, upper and lower surface adhesion nonwoven in the case where stretching air effect, and meltblown composites are made,
Middle non-woven cloth is process by polypropylene, with a thickness of 0.15mm, surface density 15g/m2。
4. taking the PP polymer chips that melt index is 150g/min by screw speed 50rpm, diameter is the spiral shell of 105mm
Bar extruder, 165 DEG C of Zhong-1 block temperature, two area's temperature are 175 DEG C, and 3rd area, 4th area, five area's temperature are 185 DEG C, and heating is squeezed
It presses after melting, then crosses 260 mesh, filter area 1.8m through temperature for 185 DEG C of filters2, by the metering pump essence that revolving speed is 20rpm
Really meltblown beam component is reached after metering.
5. meltblown beam component is by polymer melt distribution system, die system, stretching warm-air pipe paths and adds
The compositions such as heat heat preservation original part, wherein die system is mainly by spinneret, melt flow distribution plate, melt filtration net, gas plate and group encapsulation
Engaging member, sealing element composition.Each area's temperature of meltblown beam is 195 DEG C, and the temperature in each area of pipe passage is 185 DEG C, spinneret
Hole single hole extrusion output is 0.5g/min, and the length of spinning pack is 1700mm, orifice diameter 0.3mm, shares 2678 holes,
Pitch-row is that the reception distance of 0.635mm. die head spinning nozzle to reception device is 20cm.
6. forming melt-blown micro fibre stream, wherein hot-air drawing-off in hot-air drafting system after spinneret sprays
System is made of roots blower, air heater, hot air delivery pipe road etc., and roots blower power is 110kw, and revolving speed is
2900r/min, hot air temperature are 215 DEG C, heat air pressure 1.2MPa, and hot-air jet angle is 85 °, under high pressure blower
It stretches and forms melt-blown silk, mixed with the crimped staple being implanted in meltblown fiber stream, the effect by stretching air-flow makes to mix
Fiber is deposited among twin-roll, and composite fibre and spun-bonded non-woven carry out upper and lower surface bonding, then to winding device.
7. being most formed through cold wind cooling, rolling afterwards, then cutting packing and get product acoustical cotton.
Embodiment 2
1. taking three-dimensional crimp PET Hollow staple fiber and flame retardant polyester staple fibre, diameter is 25 μm, and length 60mm is first combed
Manage into single fiber state.
2. the staple fiber combed is put into fibre-opening unit to feed in cotton roller, feeding cotton speed is 6.0m/min, cotton feeding port width
For 1.2m, through thick shredding, smart shredding shredding twice,
3. being added in the thermal current of melt-blown process by jet pipe by air-flow conveying, evenly dispersed composite fibre is formed
Stream, is gathered among twin-roll, upper and lower surface adhesion nonwoven in the case where stretching air effect, and meltblown composites are made,
Middle non-woven cloth is process by polypropylene, with a thickness of 0.15mm, surface density 15g/m2
4. taking the PP polymer chips that melt index is 165g/min by screw speed 60rpm, diameter is the spiral shell of 105mm
Bar extruder, 163 DEG C of Zhong-1 block temperature, two area's temperature are 176 DEG C, and 3rd area, 4th area, five area's temperature are 188 DEG C, and heating is squeezed
It presses after melting, then crosses 260 mesh, filter area 2m through temperature for 186 DEG C of filters2, accurate for the metering pump of 23rpm by revolving speed
Meltblown beam component is reached after metering.
5. meltblown beam component is by polymer melt distribution system, die system, stretching warm-air pipe paths and adds
The compositions such as heat heat preservation original part, wherein die system is mainly by spinneret, melt flow distribution plate, melt filtration net, gas plate and group encapsulation
Engaging member, sealing element composition.Each area's temperature of meltblown beam is 196 DEG C, and the temperature in each area of pipe passage is 183 DEG C, spinneret
Hole single hole extrusion output is 0.5g/min, and the length of spinning pack is 1700mm, orifice diameter 0.3mm, shares 2678 holes,
Pitch-row is that the reception distance of 0.635mm. die head spinning nozzle to reception device is 23cm.
6. forming melt-blown micro fibre stream, wherein hot-air drawing-off in hot-air drafting system after spinneret sprays
System is made of roots blower, air heater, hot air delivery pipe road etc., and roots blower power is 110kw, and revolving speed is
2950r/min, hot air temperature are 216 DEG C, heat air pressure 1.4MPa, and hot-air jet angle is 86 °, under high pressure blower
It stretches and forms melt-blown silk, mixed with the crimped staple being implanted in meltblown fiber stream, the effect by stretching air-flow makes to mix
Fiber is deposited among twin-roll, and composite fibre and spun-bonded non-woven carry out upper and lower surface bonding, then to winding device.
7. being most formed through cold wind cooling, rolling afterwards, then cutting packing and get product acoustical cotton.
Embodiment 3
1. taking three-dimensional crimp PET Hollow staple fiber and flame retardant polyester staple fibre, diameter is 25 μm, and length 60mm is first combed
Manage into single fiber state.
2. the staple fiber combed is put into fibre-opening unit to feed in cotton roller, feeding cotton speed is 6.2m/min, cotton feeding port width
For 1.2m, through thick shredding, smart shredding shredding twice.
3. being added in the thermal current of melt-blown process by jet pipe by air-flow conveying, evenly dispersed composite fibre is formed
Stream, is gathered among twin-roll, upper and lower surface adhesion nonwoven in the case where stretching air effect, and meltblown composites are made,
Middle non-woven cloth is process by polypropylene, with a thickness of 0.15mm, surface density 15g/m2。
4. taking the PP polymer chips that melt index is 180g/min by screw speed 70rpm, diameter is the spiral shell of 105mm
Bar extruder, 170 DEG C of Zhong-1 block temperature, two area's temperature are 180 DEG C, and 3rd area, 4th area, five area's temperature are 190 DEG C, and heating is squeezed
It presses after melting, then crosses 280 mesh, filter area 2m through temperature for 190 DEG C of filters2, accurate for the metering pump of 25rpm by revolving speed
Meltblown beam component is reached after metering.
5. meltblown beam component is by polymer melt distribution system, die system, stretching warm-air pipe paths and adds
The compositions such as heat heat preservation original part, wherein die system is mainly by spinneret, melt flow distribution plate, melt filtration net, gas plate and group encapsulation
Engaging member, sealing element composition.Each area's temperature of meltblown beam is 200 DEG C, and the temperature in each area of pipe passage is 190 DEG C, spinneret
Hole single hole extrusion output is 0.5g/min, and the length of spinning pack is 1700mm, orifice diameter 0.3mm, shares 2678 holes,
Pitch-row is that the reception distance of 0.635mm. die head spinning nozzle to reception device is 25cm.
6. forming melt-blown micro fibre stream, wherein hot-air drawing-off in hot-air drafting system after spinneret sprays
System is made of roots blower, air heater, hot air delivery pipe road etc., and roots blower power is 110kw, and revolving speed is
2980r/min, hot air temperature are 220 DEG C, heat air pressure 1.6MPa, and hot-air jet angle is 90 °, under high pressure blower
It stretches and forms melt-blown silk, mixed with the crimped staple being implanted in meltblown fiber stream, the effect by stretching air-flow makes to mix
Fiber is deposited among twin-roll, and composite fibre and spun-bonded non-woven carry out upper and lower surface bonding, then to winding device.
7. being most formed through cold wind cooling, rolling afterwards, then cutting packing and get product acoustical cotton.
Traditional performance test, such as the following table 1 are carried out to the resulting acoustical cotton of embodiment 1-3.
Table 1
Sound-absorbing test is carried out to the sample of embodiment 1-3, discovery sound-absorption coefficient is increased with the increase of frequency.
The present invention is exemplarily described above, it is clear that present invention specific implementation is not subject to the restrictions described above,
As long as using the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out, or not improved this is sent out
Bright conception and technical scheme directly apply to other occasions, within the scope of the present invention.Protection of the invention
Range should be determined by the scope of protection defined in the claims.
Claims (8)
1. a kind of short fine production technology with melt-blown composite molding acoustical cotton, which is characterized in that include the following steps：
(1) PET staple fiber first combs networking, by thick shredding, smart shredding, is added to melt-blown process by air-flow conveying by jet pipe
Thermal current in, form evenly dispersed composite fibre stream, be gathered among twin-roll in the case where stretching air effect, upper and lower surface
Meltblown composites are made in bonded spunbond non-woven cloth；
(2) it after PP polymer chips heats extrusion molten by screw extruder, is filtered, by metering pump accurate measurement
Meltblown beam component is reached afterwards；
(3) after spinneret sprays, melt-blown micro fibre stream is formed in hot-air drafting system, stretches shape under high pressure blower
It at melt-blown silk, is mixed with the crimped staple being implanted in meltblown fiber stream, the effect by stretching air-flow keeps composite fibre heavy
Product is among twin-roll, and composite fibre and spun-bonded non-woven carry out upper and lower surface bonding, then to winding device；
(4) it most afterwards through cold wind cooling, rolling sizing, inspection, then cuts packing and gets product acoustical cotton.
2. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly PET staple fiber described in (1) is three-dimensional crimp PET Hollow staple fiber and flame retardant polyester staple fibre, in single after combing networking
Fiber condition.
3. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly the cotton speed of feeding that short fine thick fibre-opening unit described in (1) feeds cotton roller is 5.8-6.2m/min, and cotton feeding port width is 1-1.2m.
4. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly the melt index of PP polymer chips described in (2) is 150-180g/min, screw extruder Zhong-1 block temperature 160-170
DEG C, two area's temperature are 170-180 DEG C, and 3rd area, 4th area, five area's temperature are 180-190 DEG C, and the revolving speed of screw rod is 50-70rpm,
Diameter is 105mm.
5. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly the temperature of filter described in (2) is 180-190 DEG C, and the precision of filter is 220-280 mesh, filter area 1.5-2m2,
The revolving speed of melt metering pump is 17-25rpm.
6. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly meltblown beam component described in (2) by polymer melt distribution system, die system, stretching warm-air pipe paths and adds
Heat heat preservation original part composition, wherein die system is mainly by spinneret, melt flow distribution plate, melt filtration net, gas plate and group encapsulation
Engaging member, sealing element composition.
7. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 1, which is characterized in that step
Suddenly hot-air drafting system described in (3) is made of roots blower, air heater, hot air delivery pipe road etc., wherein Roots
Power of fan is 110kw, and revolving speed 2900-3000r/min, hot air temperature is 210-220 DEG C, heat air pressure 1.2-
1.6MPa, hot-air jet angle are 83-90 °.
8. the short fine production technology with melt-blown composite molding acoustical cotton of one kind according to claim 6, which is characterized in that institute
Each area's temperature for the die system stated is 190-200 DEG C, and the temperature in each area of pipe passage is 180-190 DEG C, and spinneret single hole squeezes
Output is 0.5g/min, and the reception distance of die head spinning nozzle to reception device is 20-25cm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111519263A (en) * | 2020-04-23 | 2020-08-11 | 东华大学 | Light medium-low frequency sound absorption material and preparation method thereof |
| CN112080856A (en) * | 2020-09-21 | 2020-12-15 | 凌扬汽车制造有限公司 | Preparation method of composite sound-absorbing material for motor home |
| CN112481822A (en) * | 2020-10-30 | 2021-03-12 | 张家港骏马无纺布有限公司 | Non-woven fabric melt-blown forming method |
| CN113293518A (en) * | 2021-06-17 | 2021-08-24 | 广西德福莱医疗器械有限公司 | Melt-blown fabric spinning method |
| CN114108181A (en) * | 2021-12-28 | 2022-03-01 | 常州市福欧车辆配件有限公司 | Preparation process of sound-absorbing cotton felt for car instead of PU foaming process |
| CN115262084A (en) * | 2022-08-29 | 2022-11-01 | 武汉叁木汽车部件有限公司 | Preparation method and application of automobile NVH material |
| CN116397383A (en) * | 2023-06-09 | 2023-07-07 | 称道新材料科技(上海)有限公司 | Meltblown cloth with three-dimensional structure and application thereof |
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Application publication date: 20181116 |