US20100175362A1 - Production method of layered sound absorptive non-woven fabric - Google Patents

Production method of layered sound absorptive non-woven fabric Download PDF

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Publication number
US20100175362A1
US20100175362A1 US12/522,410 US52241008A US2010175362A1 US 20100175362 A1 US20100175362 A1 US 20100175362A1 US 52241008 A US52241008 A US 52241008A US 2010175362 A1 US2010175362 A1 US 2010175362A1
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United States
Prior art keywords
fibrous web
layer
nanofibres
card fibrous
layers
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Abandoned
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US12/522,410
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English (en)
Inventor
Denisa Stránská
Ladislav Mares
Oldrich Jirsák
Klára Kalinová
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Elmarco sro
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Elmarco sro
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Publication date
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Assigned to ELMARCO S.R.O. reassignment ELMARCO S.R.O. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STRANSKA, DENISA, JIRSAK, OLDRICH, KALINOVA, KLARA, MARES, LADISLAV
Publication of US20100175362A1 publication Critical patent/US20100175362A1/en
Abandoned legal-status Critical Current

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    • 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
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
    • 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
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
    • 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
    • D04H13/00—Other non-woven fabrics
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/8409—Sound-absorbing elements sheet-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures

Definitions

  • the invention relates to the production method of layered sound absorptive non-woven fabric, which comprises a resonance membrane formed by a layer of nanofibres having diameter to 600 nanometers and basis weight of 0,1 to 5 gm ⁇ 2 , which is positioned between two layers of the card fibrous web.
  • the CZ PV 2005-226 discloses a layered sound absorptive non-woven fabric containing a resonance membrane and at least one another layer of fibrous material.
  • the resonance membrane is formed by a layer of nanofibres having diameter to 600 nanometers and basis weight of 0,1 to 5 gm ⁇ 2 and the resultant fabric is formed by a cross laying to the required thickness and weight.
  • the layer of card fibrous web here forms the bearing layer on which during electrostatic spinning the layer of produced nanofibres is being deposited, and consequently both layers join together in a known manner at the specified temperature in the hot air chamber.
  • another layer of card fibrous web may be applied on the fabric, namely from the originally disposable side of nanofibrous layer. Possibly there may be another layer, the double or triple one.
  • the goal of the invention is to eliminate the shortcomings of the known solutions or to restrict them considerably.
  • the goal of the invention has been reached by a production method of layered sound absorptive non-woven fabric containing a resonance membrane formed by a layer of nanofibres, which is positioned between two layers of card fibrous web according to the invention, whose principle consists in that, both layers of card fibrous web are produced simultaneously in carding machine from which at least one layer of card fibrous web is brought into the device for production of nanofibres through electrostatic spinning, in which to the side of this layer of card fibrous web adjacent to the remaining layer the layer of nanofibres is applied, after then after exiting the device for production of nanofibres through electrostatic spinning, both layers of card fibrous web near to one another until their adjacent parts, out of which at least on one there is applied a layer of nanofibres forming the resonance membrane, touch one another.
  • the structure of the device for production of nanofibres does not enable passage of a layer of card fibrous web on which the layer of nanofibres is not applied outside the spinning compartment, this layer is guided totally outside the device for production of nanofibres through electrostatic spinning, and to the layer of card fibrous web passing through the spinning compartment it is nearing only after the device for production of nanofibres through electrostatic spinning.
  • both layers of card fibrous web are guided separately into the device for production of nanofibres through electrostatic spinning, while at least one layer of the card fibrous web passes through the spinning compartment of this device and to the side of this layer of the card fibrous web adjacent to the second layer the layer of nanofibres is applied.
  • Guiding of the second layer of the card fibrous web enables its passage outside the spinning compartment of the device for production of nanofibres through electrostatic spinning.
  • both layers of the card fibrous web are guided through the spinning compartment of the device for production of nanofibres through electrostatic spinning, in which one, the upper, layer of nanofibres is applied on the side of the first layer of the card fibrous web adjacent to the second layer of the card fibrous web, and the second, the lower, layer of nanofibres is applied on the side of the second, the lower, layer of the card fibrous web reverse to the first, the upper, layer of the card fibrous web.
  • This embodiment achieves a higher sound absorption capacity as it contains two resonance membranes formed by layers of nanofibres, while each of these membranes may absorb a different range of sound waves.
  • Another increasing of absorption capacity may be achieved according to the claim 6 by that, to the layer of nanofibres applied on the side of lower layer of the card fibrous web there is joined at least one another layer of the card fibrous web with a layer of nanofibres applied on the reverse side of this another layer of the card fibrous web.
  • this further layer of the card fibrous web is produced on the same carding machine as the upper and lower layer of the card fibrous web.
  • this further layer of the card fibrous web is produced in another carding machine than the upper and lower layer of the card fibrous web.
  • This embodiment is rather more expensive, but it allows adding of another one up to three further layers of the card fibrous web.
  • the auxiliary layer of the card fibrous web may be produced on the same carding machine as the upper and lower layer of the card fibrous web or on another carding machine.
  • the advantage of another variant of solution according to the invention consists in that both layers of card fibrous web are guided through the spinning compartment of the device for production of nanofibres through electrostatic spinning, in which to the mutually adjacent sides of both layers of the card fibrous web there is applied always one layer of nanofibres.
  • the fabric containing at least two layers of the card fibrous web, in between of which there is arranged at least one layer of nanofibres, after exiting the device for production of nanofibres through electrostatic spinning may be guided into the laying device in which it is laid into layers.
  • layers of the fabric are mutually joined by heating to the temperature of melting the material with the lowest melting temperature, which is contained in layers of the fabric.
  • FIG. 1 represents the production line with passage of one card fibrous web outside the device for production of nanofibres through electrostatic spinning, the
  • FIG. 2 a section of the production line with passage of both card fibrous webs through the device for production of nanofibres through electrostatic spinning, while one of them is passing outside the spinning compartment, the
  • FIGS. 3 and 4 a section of the production line, in which the nanofibres are applied on both layers of the card fibrous web, while according to the FIG. 3 after exiting the spinning device there is only one layer of nanofibres between the two layers of card fibrous web, while according to the FIG. 4 there are after exiting the spinning device both layers of nanofibres positioned together between the two layers of the card fibrous web.
  • FIG. 5 represents a section of the production line, in which the layers of nanofibres are applied on four layers of the card fibrous web and the
  • FIG. 6 a section of the production line according to the FIG. 3 , at which on the carding machine simultaneously three layers of the card fibrous web are being produced, while the third layer forms the auxiliary covering layer.
  • FIG. 1 schematically represents the production line 1 for performance of the production method of layered sound absorptive non-woven fabric, known e.g. from the patent application CZ PV 2005-226, according to the invention.
  • the known carding machine 2 which in a known manner prepares the upper layer 21 of the card fibrous web and the lower layer 22 of the card fibrous web for production of layered sound absorptive non-woven fabric.
  • the layers 21 , 22 of the card fibrous web may be produced from staple bicomponent fibres of the type core-coating or of another suitable material.
  • the upper layer 21 of the card fibrous web is guided into the device 3 for production of nanofibres through electrostatic spinning, which is for example the device for production of nanofibres through electrostatic spinning of polymer solutions according to the patent application CZ PV 2005-360.
  • the lower layer 22 of the card fibrous web is guided outside the device 3 for production of nanofibres through electrostatic spinning.
  • the upper layer 21 of the card fibrous web in the device 3 for production of nanofibres is brought in between the pair of electrodes arranged in the spinning compartment 31 of the device 3 for production of nanofibres through electrostatic spinning. After bringing the high voltage of opposite polarity to these electrodes an electric field with a high intensity is created, which through its action of force to the polymer solution in electrostatic field, e.g. on surface of one of the electrodes from this polymer solution creates the polymer nanofibres.
  • the created polymer nanofibres after their creation are deposited on the lower side of upper layer 21 of the card fibrous web and they create a layer 32 of nanofibres, which is adjacent to the lower layer 22 of the card fibrous web.
  • the upper layer 21 of the card fibrous web with deposited layer 32 of nanofibres is exiting the device 3 for production of nanofibres through electrostatic spinning.
  • the upper layer 21 of the card fibrous web with deposited layer 32 of nanofibres is after then brought to the lower layer 22 of the card fibrous web passing outside the device 3 for production of nanofibres through electrostatic spinning and both layers 21 , 22 are then together brought into the cross laying device 4 positioned after the device 3 for production of nanofibres.
  • the cross laying device 4 there is performed a known continuous cross laying of layers 21 , 22 , which contain a layer 32 of nanofibres, and the non-reinforced layered sound absorptive fabric 41 is produced.
  • the non-reinforced layered sound absorptive fabric 41 is from the cross laying device 4 brought into the hot-air chamber 5 , where through the effect of streaming hot air the upper layer 21 containing the card fibrous web and the nanofibres are joined with the lower layer 22 of the card web, and so the layered sound absorptive non-woven fabric 51 is produced.
  • the cutting device 6 After the hot-air chamber 5 in the production line 1 there is arranged the cutting device 6 , which from the sound absorptive non-woven fabric 51 produces panels 61 of desired dimensions.
  • the cross laying device 4 may be replaced by any suitable laying device, which is able to lay the continuously brought layers 21 , 22 , which contain a layer 32 of nanofibres one on another and thus to produce the non-reinforced layered sound absorptive fabric.
  • Variant of embodiment according to the invention in which the lower layer 22 of the card fibrous web is guided through the device 3 for production of nanofibres through electrostatic spinning outside the spinning compartment 31 is represented in the FIG. 2 .
  • the device 3 for production of nanofibres through electrostatic spinning here forms a compact unit serving to guide also the lower layer 22 of the card fibrous web.
  • the layer of nanofibres 30 is applied not only on the upper layer 21 of the card fibrous web, but also on the lower layer 22 of the card fibrous web, possibly only on the lower layer 22 of the card fibrous web.
  • the device 3 for production of nanofibres through electrostatic spinning comprises a spinning compartment 31 , possibly two separated spinning compartments 311 , 312 .
  • the nanofibres are here applied on lower surfaces of both layers 21 , 22 .
  • the layers 21 , 22 comprising always the card fibrous web and the layer 32 of nanofibres enter the cross laying device 4 , one layer 32 of nanofibres is to be found between the layers 21 , 22 of the card fibrous web and the second layer 32 of nanofibres is to be found on the lower surface of the lower layer 22 .
  • Exemplary embodiment according to the FIG. 3 may be added by another layers of the card fibrous web with applied layer of nanofibres.
  • the device 3 for production of nanofibres through electrostatic spinning of polymer solutions comprises four spinning compartments 311 , 312 , 313 , 314 , into which there are brought four layers of the card fibrous web 21 , 22 , 23 , 24 from two carding machines.
  • the nanofibres are applied on the lower surface of layers 21 , 22 , 23 , 24 .
  • the layers 21 , 22 , 23 , 24 of the card fibrous web containing the layer 32 of nanofibres enter the laying device 40 the layers 21 , 22 , 23 , 24 are nearing one to another until their contact occurs, while between the layers 21 , 22 , 23 , 24 of the card fibrous web there is always one layer 32 of nanofibres.
  • the lower layer 22 of the card fibrous web is laid in the laying device on the upper layer 24 of already applied layers of the card fibrous web 21 , 22 , 23 , 24 .
  • the disadvantage of this solution is a fact, that one of the outer layers of the resultant layered sound absorptive non-woven fabric 51 is the layer 32 of nanofibres deposited on the utmost lower layer 22 of the card fibrous web, which is a part of the layered sound absorptive non-woven fabric 51 .
  • This problem is solved by exemplary embodiments according to the FIGS. 4 and 6 .
  • the carding machine 2 according to the FIG. 3 provided by means for creation of three layers 21 , 22 , 25 of the card fibrous web, out of which the layers 21 , 22 are brought into the spinning compartments 311 , 312 of the device 3 for production of nanofibres through electrostatic spinning of polymer solutions, and the layer 25 of the card fibrous web is guided outside the spinning compartments or also outside the device 3 for spinning and to the layers 21 , 22 on which in the spinning compartments 311 , 312 of the device 3 for spinning there were applied layers 32 of nanofibres, it joins before entering or on entry into the laying device 40 and so it creates the auxiliary layer 25 of the card fibrous web serving for protection of nanofibrous layer applied on the lower layer 22 of the card fibrous web.
  • the device according to the FIG. 5 may be provided by an auxiliary layer 25 .
  • the device 3 for production of nanofibres through electrostatic spinning comprises the spinning compartment 31 , possibly two separated spinning compartments 311 , 312 , as it is described at the embodiment according to the FIG. 3 .
  • the nanofibres are here applied on layers 21 , 22 so that the applied layers 32 of nanofibres are positioned on mutually adjacent surfaces of layers 21 , 22 of the card fibrous web.
  • the method of application of nanofibres down from top on the upper surface of the carrying layer is described e.g. in the CZ 294274.
  • the polymer solution is filled into a closed vessel, out of which the polymer solution is brought to the surface of the charged electrode, while with the polymer solution there is wetted e.g. the upper section of circumference of the cylinder, which from the vessel carries out on its circumference the necessary quantity of polymer solution.
  • each layer 21 , 22 , 23 , 24 of the card fibrous web to apply a layer 32 of nanofibres of different properties, at the same time under the different properties it is primarily understood the different material, out of which the nanofibres are produced, the different thickness of the layer 32 of nanofibres, the different diameter and/or length of nanofibres and other properties influencing absorbing of the sound.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
US12/522,410 2007-01-11 2008-01-11 Production method of layered sound absorptive non-woven fabric Abandoned US20100175362A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CZPV2007-27 2007-01-11
CZ20070027A CZ200727A3 (cs) 2007-01-11 2007-01-11 Zpusob výroby vrstvené zvukove pohltivé netkané textilie
PCT/CZ2008/000009 WO2008083637A1 (en) 2007-01-11 2008-01-11 Production method of layered sound absorptive non-woven fabric

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US20100175362A1 true US20100175362A1 (en) 2010-07-15

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US12/522,410 Abandoned US20100175362A1 (en) 2007-01-11 2008-01-11 Production method of layered sound absorptive non-woven fabric

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US (1) US20100175362A1 (cs)
EP (1) EP2102403A1 (cs)
JP (1) JP2010515832A (cs)
KR (1) KR20090102848A (cs)
CN (1) CN101611185A (cs)
AU (1) AU2008204668A1 (cs)
CA (1) CA2674292A1 (cs)
CZ (1) CZ200727A3 (cs)
EA (1) EA200900839A1 (cs)
WO (1) WO2008083637A1 (cs)

Cited By (6)

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US8496088B2 (en) 2011-11-09 2013-07-30 Milliken & Company Acoustic composite
US9186608B2 (en) 2012-09-26 2015-11-17 Milliken & Company Process for forming a high efficiency nanofiber filter
WO2016190753A1 (en) * 2015-05-25 2016-12-01 Dotterel Technologies Limited A shroud for an aircraft
CN107604536A (zh) * 2017-09-12 2018-01-19 曾林涛 一种蓬松弹性三维微纳米纤维材料的制备方法、装置以及由该方法制备的纤维材料及其应用
US10540952B2 (en) 2016-03-30 2020-01-21 Maryam Mohammadi Gojani Sound absorbing structure including nanofibers
US11097828B2 (en) 2017-07-24 2021-08-24 Dotterel Technologies Limited Shroud

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JP5778938B2 (ja) * 2011-02-08 2015-09-16 国立大学法人信州大学 セパレーター製造装置
CZ304656B6 (cs) * 2013-01-18 2014-08-20 Technická univerzita v Liberci Zvukově pohltivý prostředek obsahující alespoň jednu akustickou rezonanční membránu tvořenou vrstvou polymerních nanovláken
CN103572448B (zh) * 2013-11-20 2017-02-15 东华大学 一种纳米纤维混纺复合纱线的制备方法
CN106149197B (zh) * 2016-06-28 2018-10-09 华南理工大学 一种杂化结构可全生物降解复合隔音材料及其制备方法
CZ306923B6 (cs) 2016-10-06 2017-09-13 Nafigate Corporation, A.S. Způsob ukládání vrstvy polymerních nanovláken připravených elektrostatickým zvlákňováním roztoku nebo taveniny polymeru na elektricky nevodivé materiály, a tímto způsobem připravený vícevrstvý kompozit obsahující alespoň jednu vrstvu polymerních nanovláken
JP6912753B2 (ja) * 2017-05-26 2021-08-04 Jnc株式会社 極細繊維を含む積層吸音材
CN110373751A (zh) * 2019-07-03 2019-10-25 东华大学 一种均匀贴合棉网传动装置
CN112538691A (zh) * 2020-11-30 2021-03-23 东华大学 一种服用吸声降噪材料及其制备方法

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US6966939B2 (en) * 2002-05-16 2005-11-22 Branofilter Gmbh Multi-layer filter structure and use of a multi-layer filter structure
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US3772107A (en) * 1971-11-03 1973-11-13 A Gentile Method and apparatus for forming a nonwoven fibrous web
US20020175449A1 (en) * 2001-05-16 2002-11-28 Benjamin Chu Apparatus and methods for electrospinning polymeric fibers and membranes
US6966939B2 (en) * 2002-05-16 2005-11-22 Branofilter Gmbh Multi-layer filter structure and use of a multi-layer filter structure
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8496088B2 (en) 2011-11-09 2013-07-30 Milliken & Company Acoustic composite
US9186608B2 (en) 2012-09-26 2015-11-17 Milliken & Company Process for forming a high efficiency nanofiber filter
WO2016190753A1 (en) * 2015-05-25 2016-12-01 Dotterel Technologies Limited A shroud for an aircraft
AU2016267963B2 (en) * 2015-05-25 2020-08-13 Dotterel Technologies Limited A shroud for an aircraft
US10814966B2 (en) 2015-05-25 2020-10-27 Dotterel Technologies Limited Shroud for an aircraft
US10540952B2 (en) 2016-03-30 2020-01-21 Maryam Mohammadi Gojani Sound absorbing structure including nanofibers
US11097828B2 (en) 2017-07-24 2021-08-24 Dotterel Technologies Limited Shroud
CN107604536A (zh) * 2017-09-12 2018-01-19 曾林涛 一种蓬松弹性三维微纳米纤维材料的制备方法、装置以及由该方法制备的纤维材料及其应用

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CN101611185A (zh) 2009-12-23
JP2010515832A (ja) 2010-05-13
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KR20090102848A (ko) 2009-09-30
AU2008204668A1 (en) 2008-07-17

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