US20080173497A1 - Layered Sound Absorptive Non-Woven Fabric - Google Patents
Layered Sound Absorptive Non-Woven Fabric Download PDFInfo
- Publication number
- US20080173497A1 US20080173497A1 US11/911,135 US91113506A US2008173497A1 US 20080173497 A1 US20080173497 A1 US 20080173497A1 US 91113506 A US91113506 A US 91113506A US 2008173497 A1 US2008173497 A1 US 2008173497A1
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- layer
- nanofibres
- surface weight
- sound
- fabric
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- Abandoned
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- 239000004745 nonwoven fabric Substances 0.000 title abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 16
- 239000002657 fibrous material Substances 0.000 claims abstract description 9
- 239000004744 fabric Substances 0.000 claims description 56
- 238000010041 electrostatic spinning Methods 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 239000002121 nanofiber Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920001634 Copolyester Polymers 0.000 description 2
- 101100189632 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PTC6 gene Proteins 0.000 description 2
- 102100034492 Serine/threonine-protein phosphatase 4 catalytic subunit Human genes 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 101150009837 ppp4c gene Proteins 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 101100189627 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PTC5 gene Proteins 0.000 description 1
- 101100082911 Schizosaccharomyces pombe (strain 972 / ATCC 24843) ppp1 gene Proteins 0.000 description 1
- 239000012814 acoustic material Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- 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
-
- 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
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
-
- 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
- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/12—Conjugate fibres, e.g. core/sheath or side-by-side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2419/00—Buildings or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
-
- 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 layered sound absorptive non-woven fabric containing the resonance membrane and at least one another layer of fibrous material.
- the sound absorptive materials are generally used in automotive, aviation, building as well as machinery industry. Their task is to provide for hygiene of surroundings from the point of view of undesired and harmful sound.
- the proposal itself of a suitable acoustic material is based on frequency area of an undesired sound in the given surroundings.
- porous materials For absorbing of high frequency sound especially the porous materials are used which are nevertheless unsuitable for absorbing of sound of lower frequencies, this especially due to great material thickness needed.
- used materials include for example the melamine, polyurethane and metal foams or non-woven fabrics of mineral or polymeric fibres. Such materials are not so much suitable for absorbing of sound of lower frequencies, as a great material thickness is needed.
- the general objective is to combine the above mentioned characteristics into one acoustic system, which would be able to absorb both the sound of low as well as the sound of high frequencies.
- the layered sound absorptive material composed of one or several identical layers of fibres of diameter 0.05 to 5 micrometers obtained through splitting of the PVA foil is known from the JP 10251951 A. These fibres usually show a broad distribution of diameters, but only a very low percentage of these fibres may have the diameter under 1 micrometer. The data on sound absorption at low frequency, which shows a low efficiency of 10 percent also corresponds to this fact.
- the layered sound absorptive material composed of several layers of non-woven fabric and several layers of polyester fibres of common diameters produced by means of the melt-blown method, through which the smallest diameter of fibres of about 1 micrometer may be achieved, is known from the JP 2003049351 A.
- the disadvantage is that this material is designated especially for absorbing of sound of medium frequencies, namely from 1000 to 4000 Hz.
- the objective of the invention is to eliminate or at least to minimise the disadvantages of present state of the art and to create a fabric capable at low thickness to absorb both the low as well as the high frequencies of sound.
- the objective of the invention has been achieved by a layered sound absorptive non-woven fabric containing the resonance membrane and at least one another layer of fibrous material, whose principle consists in that the resonance membrane is formed by a layer of nanofibres of diameter to 600 nanometers and of surface weight 0.1 to 5 g/m 2 , when the resonance membrane together with at least one layer of fibrous material is formed by means of cross laying to the required thickness and surface weight.
- the layer of nanofibres is created through the electrostatic spinning of polymer solution, as such layer of nanofibres may be applied on the substrate layer of fibrous material during spinning, and joined with this layer consequently.
- the substrate layer of fibrous material is, according to the claim 3 , with advantage created by at least one layer of carded fibrous web consisting of fibres having diameter of 10 to 45 micrometers and of surface weight of 5 to 100 g/m 2 .
- the layer of nanofibres with a layer of carded fibrous web consisting of fibres having diameter of 10 to 45 micrometers and surface weight of 5 to 100 g/m 2 is joined on its each side.
- the sound absorptive fabric according to the invention absorbs the sound at low frequencies and simultaneously it does not lose the ability of absorption capacity for the higher sound frequencies. Through this ability, which is based on the resonance effect of nanofibre layer damped in elastic manner by the substrate layer created with advantage by the carded fibrous web, it surpasses to date known materials.
- FIG. 1 shows the cross section of fabric made of carded fibrous web and a nanofibre layer
- FIG. 2 the cross section of fabric made of carded fibrous web, a nanofibre layer and another layer of carded fibrous web,
- FIG. 3 shows the cross section of fabric made of layer of carded fibrous web, a nanofibre layer and a couple of another layers of carded fibrous web,
- FIG. 4 the cross section of fabric made of layer of carded fibrous web, a nanonfibre layer and a trio of layers of carded fibrous web,
- FIGS. 5 to 11 show the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the nanofibre layer itself for examples 1 to 7.
- the layered sound absorptive non-woven fabric according to FIG. 1 contains the resonance membrane created by a layer 2 of nanofibres of diameter to 600 nanometers produced through electrostatic spinning and of surface weight of 0.1 to 5 g/m 2 , and a layer 1 of carded fibrous web, when in the advantageous execution the layer 1 of carded fibrous web creates the carrying layer to which during electrostatic spinning the layer 2 of produced nanofibres is deposited, after which both layers join together through a known way at a specified temperature in the hot-air chamber.
- another layer 3 of carded fibrous web namely from the originally free side of the layer 2 of nanofibres.
- another layer 3 may be a double one—see the FIG. 3 , or a triple one—see the FIG. 4 .
- this fabric is formed by means of cross laying to the required thickness and to the required surface weight.
- the layer 2 of nanofibres fulfils the function of acoustic resonance membrane vibrating at the low frequency. This character is given by the nano-dimensions of space among the fibres. If a sound wave falls to the acoustic resonance membrane, it brings it to the forced vibration, whose amplitude is maximum in case of resonance, simultaneously the neighbouring layers 1 , 3 of carded fibrous web provide for a sufficient damping of the vibrating membrane, at the same time the maximum quantity of the sound energy gathered in the resonator is transferred into a heat.
- the layer 1 and/or 3 of the carded fibrous web provides not only for a sufficient damping of vibrating membrane created by a layer 2 of nanofibres, but also absorbs the sounds of higher frequencies.
- the above mentioned layers 1 , 2 , 3 are at the same time associated into one resonance system through laying of individual layers 1 , 2 , 3 one on another and through their joining for example in the hot-air bonding chamber.
- This laying of resonance elements such a material is being produced which, thanks to the resonance membrane created by the layer 2 of nanofibres, absorbs the sound of low frequencies and simultaneously through the layer 1 and/or 3 of the carded fibrous web, also the sound of higher frequencies.
- the fabric according to the invention reaches high values of coefficient of sound absorption capacity for the sounds of low as well as of high frequency, simultaneously it is possible to adjust the material thickness and possibly its surface weight to various requirements.
- the sound absorptive fabric contains a layer 1 of carded fibrous web of surface weight of 11 gm ⁇ 2 produced on the carding machine of the bicomponent fibre of the core-coating type composed of the polyester core and the copolyester coating of the count 5.3 dtex.
- the layer 2 of nanofibres of surface weight 2 gm ⁇ 2 is applied onto this layer of fibrous web 1 through electrostatic spinning. Onto a pair of layers 1 , 2 prepared in this way, from the side of layer 2 of nanofibres there is positioned another layer 3 of the carded fibrous web.
- the basic fabric is then created according to FIG.
- the sound absorptive fabric passes through the hot-air chamber at the temperature of circulating air of 140° C., through which the neighbouring layers are joined mutually.
- This sound absorptive fabric may contain the layer 2 of nanofibres with surface weight in the range from 2 gm ⁇ 2 to 0.1 gm ⁇ 2 .
- the FIG. 5 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 of nanofibres itself for the sound absorptive fabric according to the example 1, at the same time the curve N 1 expresses this dependence for the layer 2 of nanofibres with surface weight of 2 gm ⁇ 2 , the curve N 2 for the layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve N 3 for the layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 , the curve N 4 for the layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 and the curve N 5 for the layer 2 of nanofibres with surface weight of 0.1 gm ⁇ 2 .
- the curve P expresses this dependence for a fabric containing only a layer of carded fibrous web, i.e. without using the layer 2 of nanofibres. From the course of individual curves it is possible to select composition of sound absorptive fabric according to actual needs of the issue being solved.
- the sound absorptive fabric shown in the FIG. 1 contains a layer 1 of carded fibrous web with the surface weight of 11 gm ⁇ 2 produced on the carding machine of the bicomponent fibres of the core-coating type composed of the polyester core and the copolyester coating of the count 5.3 dtex.
- the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied onto the layer 1 of fibrous web through electrostatic spinning, in the same manner as in the example 1.
- Fabric of these two layers 1 , 2 is after then formed through a cross laying into a sound absorptive fabric with a total thickness of 35 mm and surface weight of 630 gm ⁇ 2 , after which it is heat treated in the same manner as in the example 1, through which the neighbouring layers are joined.
- the sound absorptive fabric is produced in the same manner as in example 1, when the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied on the basic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair of layers 1 , 2 prepared in this manner, there is positioned another layer 3 of carded fibrous web from the side of the layer 2 of nanofibres.
- the fabric is then created according to the FIG. 2 and consequently formed through the cross laying into the sound absorptive fabric with the total thickness of 35 mm and surface weight of 630 gm ⁇ 2 , after which it is heat treated in the same manner as in the example 1.
- the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 of nanofibres for the sound absorptive fabric according to the example 3 is shown in FIG. 7 , at the same time the curve N 1 expresses this dependence for the layer 2 of nanofibres with surface weight of 2 gm ⁇ 2 , the curve N 2 for layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve N 3 for layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 , the curve N 4 for layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 and the curve N 5 for layer 2 of nanofibres with surface weight of 0.1 gm ⁇ 2 .
- the curve P expresses this dependence for fabric containing a layer of carded fibrous web only, i.e. without usage of layer 2 of nanofibres.
- the sound absorptive fabric is produced in the same manner as in example 1, when the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied on the basic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair of layers 1 , 2 prepared in this manner, there are positioned another two layers 3 of carded fibrous web from the side of the layer 2 of nanofibres.
- the fabric is then created according to FIG. 3 .
- the fabric created in this manner is further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and the surface weight of 630 gm ⁇ 2 .
- the fabric created in this manner is subject to the heat treatment, the same as in the example 1.
- the FIG. 8 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 of nanofibres itself for the sound absorptive fabric according to the example 4, at the same time the curve PP 1 expresses this dependence for layer 2 of nanofibres with surface weight of 2 gm ⁇ 2 , the curve PP 2 for layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve PP 3 for layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 , the curve PP 4 for layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 and the curve PP 5 for layer 2 of nanofibres with surface weight of 0.1 gm ⁇ 2 .
- the sound absorptive fabric is produced in the same manner as in example 1, when the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied on the basic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair of layers 1 , 2 prepared in this manner, there are positioned another three layers 3 of carded fibrous web from the side of the layer 2 of nanofibres.
- the fabric is then created according to the FIG. 4 .
- the fabric created in this manner is further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 630 gm ⁇ 2 .
- the fabric created in this manner is subject to the heat treatment, the same as in the example 1.
- FIG. 9 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 of nanofibres itself for fabric according to the example 5, at the same time the curve PPP 2 expresses this dependence for layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve PPP 3 for layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 and the curve PPP 4 for layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 .
- the sound absorptive fabric is produced in the same manner as in example 1, when the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied on the basic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair of layers 1 , 2 prepared in this manner, there are positioned another two layers 3 of carded fibrous web from the side of the layer 2 of nanofibres.
- the fabric is then created according to the FIG. 3 and further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 450 gm ⁇ 2 , after which it is subject to the heat treatment, the same as in the example 1.
- the FIG. 10 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 itself of nanofibres for the sound absorptive fabric according to the example 6, at the same time the curve PP 1 expresses this dependence for layer 2 of nanofibres with surface weight of 2 gm ⁇ 2 , the curve PP 2 for layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve PP 3 for layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 , the curve PP 4 for layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 and the curve PP 5 for layer 2 of nanofibres with surface weight of 0.1 gm ⁇ 2 .
- the sound absorptive fabric is produced in the same manner as in example 1, when the layer 2 of nanofibres with surface weight from 2 to 0.1 gm ⁇ 2 is applied on the basic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair of layers 1 , 2 prepared in this manner, there are positioned another three layers 3 of carded fibrous web from the side of the layer 2 of nanofibres.
- the fabric is then created according to the FIG. 4 .
- the fabric is then created according to the FIG. 4 and further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 450 gm ⁇ 2 , after which it is subject to the heat treatment, in the same manner as in the example 1.
- the FIG. 11 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the layer 2 itself of nanofibres for the sound absorptive fabric according to the example 7, at the same time the curve PPP 1 expresses this dependence for the layer 2 of nanofibres with surface weight of 2 gm ⁇ 2 , the curve PPP 2 for layer 2 of nanofibres with surface weight of 1 gm ⁇ 2 , the curve PPP 3 for layer 2 of nanofibres with surface weight of 0.5 gm ⁇ 2 and the curve PPP 4 for layer 2 of nanofibres with surface weight of 0.3 gm ⁇ 2 .
- the above mentioned examples of usage are illustrative only and the invention relates as well to the sound absorptive fabrics containing layers of carded fibrous web of other surface weights and/or composed from other fibres and also to other surface weights, selected as need may be, of nanofibre layers.
- the invention is limited to the described number of layers of sound absorptive fabric.
- the shown dependencies of coefficient of sound absorption capacity on sound frequency and the surface weight of the nanofibre layer itself prove a high sound absorption capacity of the fabric according to the invention, especially in the areas of 500 to 6000 Hz, when the coefficient of sound absorption capacity varies from 0.8 to nearly 1.
- the invention is applicable especially at the producers of sound absorptive lining and components for automotive, aviation, building and machinery industry, and if compared with the present state of the art it considerably improves the hygiene of surroundings in the sphere of an undesired sound.
Abstract
The invention relates to the layered sound absorptive non-woven fabric containing the resonance membrane and at least one another layer (1, 3) of the fibrous material at which the resonance membrane is created by a layer (2) of nanofibres having diameter to 600 nanometers and of surface weight 0.1 to 5 g/m2, at the same time the resonance membrane together with at least one layer (1, 3) of fibrous material is formed by cross laying to the required thickness and surface weight.
Description
- The invention relates to the layered sound absorptive non-woven fabric containing the resonance membrane and at least one another layer of fibrous material.
- The sound absorptive materials are generally used in automotive, aviation, building as well as machinery industry. Their task is to provide for hygiene of surroundings from the point of view of undesired and harmful sound. The proposal itself of a suitable acoustic material is based on frequency area of an undesired sound in the given surroundings.
- For absorbing of high frequency sound especially the porous materials are used which are nevertheless unsuitable for absorbing of sound of lower frequencies, this especially due to great material thickness needed. Such used materials include for example the melamine, polyurethane and metal foams or non-woven fabrics of mineral or polymeric fibres. Such materials are not so much suitable for absorbing of sound of lower frequencies, as a great material thickness is needed.
- To absorb the low frequencies, especially the structures based on resonance principle are used, when through resonance of some elements the acoustic energy is being transferred into a thermal energy. Nevertheless these structures are absorbing the sounds at a certain low frequency, while for other frequencies its absorbing is very little. The combinations of perforated panel, absorptive material and possibly the air gaps are being used. The characteristics of perforated panel is given by number, diameter and arrangement of gaps.
- The general objective is to combine the above mentioned characteristics into one acoustic system, which would be able to absorb both the sound of low as well as the sound of high frequencies.
- The layered sound absorptive material composed of one or several identical layers of fibres of diameter 0.05 to 5 micrometers obtained through splitting of the PVA foil is known from the JP 10251951 A. These fibres usually show a broad distribution of diameters, but only a very low percentage of these fibres may have the diameter under 1 micrometer. The data on sound absorption at low frequency, which shows a low efficiency of 10 percent also corresponds to this fact.
- The layered sound absorptive material composed of several layers of non-woven fabric and several layers of polyester fibres of common diameters produced by means of the melt-blown method, through which the smallest diameter of fibres of about 1 micrometer may be achieved, is known from the JP 2003049351 A. The disadvantage is that this material is designated especially for absorbing of sound of medium frequencies, namely from 1000 to 4000 Hz.
- The objective of the invention is to eliminate or at least to minimise the disadvantages of present state of the art and to create a fabric capable at low thickness to absorb both the low as well as the high frequencies of sound.
- The objective of the invention has been achieved by a layered sound absorptive non-woven fabric containing the resonance membrane and at least one another layer of fibrous material, whose principle consists in that the resonance membrane is formed by a layer of nanofibres of diameter to 600 nanometers and of surface weight 0.1 to 5 g/m2, when the resonance membrane together with at least one layer of fibrous material is formed by means of cross laying to the required thickness and surface weight.
- At the same time it is advantageous if the layer of nanofibres is created through the electrostatic spinning of polymer solution, as such layer of nanofibres may be applied on the substrate layer of fibrous material during spinning, and joined with this layer consequently.
- The substrate layer of fibrous material is, according to the
claim 3, with advantage created by at least one layer of carded fibrous web consisting of fibres having diameter of 10 to 45 micrometers and of surface weight of 5 to 100 g/m2. - To increase the absorption capacity, the layer of nanofibres with a layer of carded fibrous web consisting of fibres having diameter of 10 to 45 micrometers and surface weight of 5 to 100 g/m2 is joined on its each side.
- The sound absorptive fabric according to the invention absorbs the sound at low frequencies and simultaneously it does not lose the ability of absorption capacity for the higher sound frequencies. Through this ability, which is based on the resonance effect of nanofibre layer damped in elastic manner by the substrate layer created with advantage by the carded fibrous web, it surpasses to date known materials.
- The examples of invention execution are schematically shown on the enclosed drawings, where
- the
FIG. 1 shows the cross section of fabric made of carded fibrous web and a nanofibre layer, - the
FIG. 2 the cross section of fabric made of carded fibrous web, a nanofibre layer and another layer of carded fibrous web, - the
FIG. 3 shows the cross section of fabric made of layer of carded fibrous web, a nanofibre layer and a couple of another layers of carded fibrous web, - the
FIG. 4 the cross section of fabric made of layer of carded fibrous web, a nanonfibre layer and a trio of layers of carded fibrous web, - the
FIGS. 5 to 11 show the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the nanofibre layer itself for examples 1 to 7. - The layered sound absorptive non-woven fabric according to
FIG. 1 contains the resonance membrane created by alayer 2 of nanofibres of diameter to 600 nanometers produced through electrostatic spinning and of surface weight of 0.1 to 5 g/m2, and alayer 1 of carded fibrous web, when in the advantageous execution thelayer 1 of carded fibrous web creates the carrying layer to which during electrostatic spinning thelayer 2 of produced nanofibres is deposited, after which both layers join together through a known way at a specified temperature in the hot-air chamber. - At the sound absorptive fabric according to
FIG. 2 on the fabric according toFIG. 1 there is applied anotherlayer 3 of carded fibrous web, namely from the originally free side of thelayer 2 of nanofibres. At the further executions, anotherlayer 3 may be a double one—see theFIG. 3 , or a triple one—see theFIG. 4 . - To reach the suitable thickness and surface weight of the resulted sound absorptive non-woven fabric, it is advantageous if, after creating the fabric of individual layers according to
FIG. 1 to 4 , this fabric is formed by means of cross laying to the required thickness and to the required surface weight. - The
layer 2 of nanofibres fulfils the function of acoustic resonance membrane vibrating at the low frequency. This character is given by the nano-dimensions of space among the fibres. If a sound wave falls to the acoustic resonance membrane, it brings it to the forced vibration, whose amplitude is maximum in case of resonance, simultaneously the neighbouringlayers layer 1 and/or 3 of the carded fibrous web provides not only for a sufficient damping of vibrating membrane created by alayer 2 of nanofibres, but also absorbs the sounds of higher frequencies. The above mentionedlayers individual layers layer 2 of nanofibres, absorbs the sound of low frequencies and simultaneously through thelayer 1 and/or 3 of the carded fibrous web, also the sound of higher frequencies. The fabric according to the invention reaches high values of coefficient of sound absorption capacity for the sounds of low as well as of high frequency, simultaneously it is possible to adjust the material thickness and possibly its surface weight to various requirements. - The particular examples of execution of sound absorptive fabrics according to the invention are described lower.
- The sound absorptive fabric contains a
layer 1 of carded fibrous web of surface weight of 11 gm−2 produced on the carding machine of the bicomponent fibre of the core-coating type composed of the polyester core and the copolyester coating of the count 5.3 dtex. Thelayer 2 of nanofibres ofsurface weight 2 gm−2 is applied onto this layer offibrous web 1 through electrostatic spinning. Onto a pair oflayers layer 2 of nanofibres there is positioned anotherlayer 3 of the carded fibrous web. The basic fabric is then created according toFIG. 2 and consequently formed by means of cross laying into the sound absorptive fabric of total thickness of 25 mm and surface weight of 630 gm−2. The sound absorptive fabric passes through the hot-air chamber at the temperature of circulating air of 140° C., through which the neighbouring layers are joined mutually. This sound absorptive fabric may contain thelayer 2 of nanofibres with surface weight in the range from 2 gm−2 to 0.1 gm−2. - The
FIG. 5 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of thelayer 2 of nanofibres itself for the sound absorptive fabric according to the example 1, at the same time the curve N1 expresses this dependence for thelayer 2 of nanofibres with surface weight of 2 gm−2, the curve N2 for thelayer 2 of nanofibres with surface weight of 1 gm−2, the curve N3 for thelayer 2 of nanofibres with surface weight of 0.5 gm−2, the curve N4 for thelayer 2 of nanofibres with surface weight of 0.3 gm−2 and the curve N5 for thelayer 2 of nanofibres with surface weight of 0.1 gm−2. The curve P expresses this dependence for a fabric containing only a layer of carded fibrous web, i.e. without using thelayer 2 of nanofibres. From the course of individual curves it is possible to select composition of sound absorptive fabric according to actual needs of the issue being solved. - The sound absorptive fabric shown in the
FIG. 1 contains alayer 1 of carded fibrous web with the surface weight of 11 gm−2 produced on the carding machine of the bicomponent fibres of the core-coating type composed of the polyester core and the copolyester coating of the count 5.3 dtex. Thelayer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied onto thelayer 1 of fibrous web through electrostatic spinning, in the same manner as in the example 1. Fabric of these twolayers - The dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the
layer 2 of nanofibres itself for the fabric according to the example 2 is shown inFIG. 6 , at the same time the curve J3 expresses this dependence forlayer 2 of nanofibres with surface weight of 0.5 gm−2, the curve J4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2 and the curve J5 for thelayer 2 of nanofibres with surface weight of 0.3 gm−2. - The sound absorptive fabric is produced in the same manner as in example 1, when the
layer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied on thebasic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair oflayers layer 3 of carded fibrous web from the side of thelayer 2 of nanofibres. The fabric is then created according to theFIG. 2 and consequently formed through the cross laying into the sound absorptive fabric with the total thickness of 35 mm and surface weight of 630 gm−2, after which it is heat treated in the same manner as in the example 1. - The dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of the
layer 2 of nanofibres for the sound absorptive fabric according to the example 3 is shown inFIG. 7 , at the same time the curve N1 expresses this dependence for thelayer 2 of nanofibres with surface weight of 2 gm−2, the curve N2 forlayer 2 of nanofibres with surface weight of 1 gm−2, the curve N3 forlayer 2 of nanofibres with surface weight of 0.5 gm−2, the curve N4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2 and the curve N5 forlayer 2 of nanofibres with surface weight of 0.1 gm−2. The curve P expresses this dependence for fabric containing a layer of carded fibrous web only, i.e. without usage oflayer 2 of nanofibres. - The sound absorptive fabric is produced in the same manner as in example 1, when the
layer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied on thebasic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair oflayers layers 3 of carded fibrous web from the side of thelayer 2 of nanofibres. The fabric is then created according toFIG. 3 . The fabric created in this manner is further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and the surface weight of 630 gm−2. The fabric created in this manner is subject to the heat treatment, the same as in the example 1. - The
FIG. 8 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of thelayer 2 of nanofibres itself for the sound absorptive fabric according to the example 4, at the same time the curve PP1 expresses this dependence forlayer 2 of nanofibres with surface weight of 2 gm−2, the curve PP2 forlayer 2 of nanofibres with surface weight of 1 gm−2, the curve PP3 forlayer 2 of nanofibres with surface weight of 0.5 gm−2, the curve PP4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2 and the curve PP5 forlayer 2 of nanofibres with surface weight of 0.1 gm−2. - The sound absorptive fabric is produced in the same manner as in example 1, when the
layer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied on thebasic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair oflayers layers 3 of carded fibrous web from the side of thelayer 2 of nanofibres. The fabric is then created according to theFIG. 4 . The fabric created in this manner is further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 630 gm−2. The fabric created in this manner is subject to the heat treatment, the same as in the example 1. - The
FIG. 9 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of thelayer 2 of nanofibres itself for fabric according to the example 5, at the same time the curve PPP2 expresses this dependence forlayer 2 of nanofibres with surface weight of 1 gm−2, the curve PPP3 forlayer 2 of nanofibres with surface weight of 0.5 gm−2 and the curve PPP4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2. - The sound absorptive fabric is produced in the same manner as in example 1, when the
layer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied on thebasic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair oflayers layers 3 of carded fibrous web from the side of thelayer 2 of nanofibres. The fabric is then created according to theFIG. 3 and further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 450 gm−2, after which it is subject to the heat treatment, the same as in the example 1. - The
FIG. 10 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of thelayer 2 itself of nanofibres for the sound absorptive fabric according to the example 6, at the same time the curve PP1 expresses this dependence forlayer 2 of nanofibres with surface weight of 2 gm−2, the curve PP2 forlayer 2 of nanofibres with surface weight of 1 gm−2, the curve PP3 forlayer 2 of nanofibres with surface weight of 0.5 gm−2, the curve PP4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2 and the curve PP5 forlayer 2 of nanofibres with surface weight of 0.1 gm−2. - The sound absorptive fabric is produced in the same manner as in example 1, when the
layer 2 of nanofibres with surface weight from 2 to 0.1 gm−2 is applied on thebasic layer 1 of carded fibrous web through the electrostatic spinning. On such a pair oflayers layers 3 of carded fibrous web from the side of thelayer 2 of nanofibres. The fabric is then created according to theFIG. 4 . The fabric is then created according to theFIG. 4 and further formed by means of cross laying into the sound absorptive fabric of the total thickness of 35 mm and with the surface weight of 450 gm−2, after which it is subject to the heat treatment, in the same manner as in the example 1. - The
FIG. 11 shows the dependence of coefficient of sound absorption capacity on the sound frequency and surface weight of thelayer 2 itself of nanofibres for the sound absorptive fabric according to the example 7, at the same time the curve PPP1 expresses this dependence for thelayer 2 of nanofibres with surface weight of 2 gm−2, the curve PPP2 forlayer 2 of nanofibres with surface weight of 1 gm−2, the curve PPP3 forlayer 2 of nanofibres with surface weight of 0.5 gm−2 and the curve PPP4 forlayer 2 of nanofibres with surface weight of 0.3 gm−2. - The above mentioned examples of usage are illustrative only and the invention relates as well to the sound absorptive fabrics containing layers of carded fibrous web of other surface weights and/or composed from other fibres and also to other surface weights, selected as need may be, of nanofibre layers. In no way the invention is limited to the described number of layers of sound absorptive fabric. The shown dependencies of coefficient of sound absorption capacity on sound frequency and the surface weight of the nanofibre layer itself prove a high sound absorption capacity of the fabric according to the invention, especially in the areas of 500 to 6000 Hz, when the coefficient of sound absorption capacity varies from 0.8 to nearly 1.
- The invention is applicable especially at the producers of sound absorptive lining and components for automotive, aviation, building and machinery industry, and if compared with the present state of the art it considerably improves the hygiene of surroundings in the sphere of an undesired sound.
Claims (5)
1. The layered sound absorptive non-woven textile containing the resonance membrane and at least one another layer of fibrous material, characterised by that the resonance membrane is created by a layer (2) of nanofibres of diameter to 600 nanometers and of surface weight 0.1 to 5 g/m2.
2. The layered sound absorptive fabric according to the claim 1 , characterised by that the layer (2) of nanofibres is created through electrostatic spinning of polymer solution.
3. The layered sound absorptive fabric according to the claim 2 , characterised by that the layer (2) of nanofibres is joined together with at least one layer (1, 3) of carded fibrous web composed of fibres having diameter of 10 to 45 micrometers and of the surface weight 5 to 100 g/m2.
4. The layered sound absorptive fabric according to the claim 3 , characterised by that the layer (2) of nanofibres is joined on its each side with a layer (1, 3) of carded fibrous web created by fibres having diameter of 10 to 45 micrometers and of surface weight 5 to 100 g/m2.
5. The layered sound absorptive non-woven textile according to any of the previous claims, characterised by that the resonance membrane together with another at least one layer (1, 3) of fibrous material is formed by means of cross laying into the system of layers having the required thickness and/or surface weight.
Applications Claiming Priority (3)
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CZPV2005-226 | 2005-04-11 | ||
CZ20050226A CZ2005226A3 (en) | 2005-04-11 | 2005-04-11 | Bonded sound-absorbing non-woven fabric |
PCT/CZ2006/000017 WO2006108363A2 (en) | 2005-04-11 | 2006-04-10 | Layered sound absorptive non-woven fabric |
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US20080173497A1 true US20080173497A1 (en) | 2008-07-24 |
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US11/911,135 Abandoned US20080173497A1 (en) | 2005-04-11 | 2006-04-10 | Layered Sound Absorptive Non-Woven Fabric |
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US (1) | US20080173497A1 (en) |
EP (1) | EP1869239A2 (en) |
JP (1) | JP2008537798A (en) |
KR (1) | KR20080004481A (en) |
CN (1) | CN101189381A (en) |
AU (1) | AU2006233442A1 (en) |
CA (1) | CA2601813A1 (en) |
CZ (1) | CZ2005226A3 (en) |
EA (1) | EA011173B1 (en) |
TW (1) | TW200706356A (en) |
UA (1) | UA89533C2 (en) |
WO (1) | WO2006108363A2 (en) |
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CA2601813A1 (en) | 2006-10-19 |
EA011173B1 (en) | 2009-02-27 |
JP2008537798A (en) | 2008-09-25 |
CN101189381A (en) | 2008-05-28 |
AU2006233442A1 (en) | 2006-10-19 |
TW200706356A (en) | 2007-02-16 |
EP1869239A2 (en) | 2007-12-26 |
WO2006108363A2 (en) | 2006-10-19 |
EA200702133A1 (en) | 2008-02-28 |
CZ2005226A3 (en) | 2006-11-15 |
WO2006108363B1 (en) | 2007-01-11 |
UA89533C2 (en) | 2010-02-10 |
WO2006108363A3 (en) | 2006-11-30 |
KR20080004481A (en) | 2008-01-09 |
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