US20030104749A1 - Sound absorbing material - Google Patents
Sound absorbing material Download PDFInfo
- Publication number
- US20030104749A1 US20030104749A1 US10/203,905 US20390502A US2003104749A1 US 20030104749 A1 US20030104749 A1 US 20030104749A1 US 20390502 A US20390502 A US 20390502A US 2003104749 A1 US2003104749 A1 US 2003104749A1
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- US
- United States
- Prior art keywords
- sound absorbing
- absorbing material
- recited
- endless filaments
- dtex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
- D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
-
- 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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/016—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the fineness
-
- 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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
- D04H3/147—Composite yarns or filaments
-
- 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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/608—Including strand or fiber material which is of specific structural definition
- Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/608—Including strand or fiber material which is of specific structural definition
- Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
- Y10T442/615—Strand or fiber material is blended with another chemically different microfiber in the same layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/608—Including strand or fiber material which is of specific structural definition
- Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
- Y10T442/625—Autogenously bonded
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/608—Including strand or fiber material which is of specific structural definition
- Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
- Y10T442/626—Microfiber is synthetic polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
Definitions
- the invention relates to a sound absorbing material, made from a microfilament nonwoven fabric having a mass per unit area of 40 to 300 g/m 2 .
- Paneling parts for automobile interiors such as roof linings, which possess sound absorbing properties, are known from the documents European Patent 0 909 680 and U.S. Pat. No. 4,851,283. They are made from a staple fiber nonwoven fabric layer in which preferably polyester fibers are bonded using binding fibers, and are coated with at least one foam material layer.
- insulating and sound absorbing materials that are made from staple fiber nonwoven fabrics, particularly from polyester fibers, and are bonded using mechanical as well as thermal processes, are known from the documents DE 197 26 965 and DE 197 08 188.
- the paneling parts used in the interior of the automobile are supposed to demonstrate attractive optical and sensory properties of the decor.
- the parts are supposed to be capable of recycling, to possess a very high level of resistance to color fading especially under the effects of black-panel temperatures, a low tendency to become dirty, a high level of friction wear resistance, moisture resistance, fire resistance, cleanability, and a very good capacity for deep drawing, and furthermore to take into account the increasing requirements with regard to noise absorption, with the goal of increasing the comfort of automobile passengers.
- the invention has set itself the task of indicating a sound absorbing material, as well as a method for its production, that take into account the stated requirements.
- the task is accomplished by a sound absorbing material that is made from a microfilament nonwoven fabric having a mass per unit area of 40 to 300 g/m 2 , the a nonwoven fabric being made from a melt-spun, drawn multi-component endless filament having a titer of 1.5 to 5 dtex, being directly laid up to form a fibrous web, and the multi-component endless filaments, optionally prebonded being split to micro-endless filaments having a titer of 0.1 to 1.2 dtex, up to at least 80%, and bonded.
- the sound absorbing material demonstrates a high level of specific fiber surface at a comparatively low mass per unit area, as well as high opacity. The fineness of the filaments permits good printability and embossability, and thereby decorative structuring of the material.
- the sound absorbing material is one in which the nonwoven fabric is made from melt-spun, aerodynamically stretched multi-component endless filaments and directly laid up to form a fibrous web, having a titer of 1.5 to 3 dtex, and the multi-component endless filaments are split to micro-endless filaments having a titer of 0.1 to 0.3 dtex, up to a degree of 80% and bonded.
- the sound absorbing material demonstrates an isotropic filament distribution in the web, making further processing relatively independent of the machine running direction and thereby very advantageous for material utilization.
- the sound absorbing material is one in which the multi-component endless filament is a bicomponent endless filament made from two incompatible polymers, particularly a polyester and a polyamide.
- a bicomponent endless filament demonstrates good splittability into micro-endless filaments and results in an advantageous ratio of strength to mass per unit area.
- the sound absorbing material according to the invention is very easy to clean and wipe down, because of the polymers used and their filament structure, and demonstrates a high level of friction wear resistance, i.e. it is easy to take care of.
- the sound absorbing material is one in which the multi-component endless filaments have a cross-section having an orange-like multi-segment structure, also called a “pie” structure, the segments alternately containing one of the two incompatible polymers in each case.
- a “side-by-side” (s/s) arrangement of the incompatible polymers in the multi-component endless filaments is also possible, which arrangement is preferably used for the production of crimped filaments.
- Such segment arrangements of the incompatible polymers in the multi-component endless filament have proven to be very easy to split.
- the sound absorbing material possesses a good deep drawing capacity, or deformability, which is expressed in the average strength values at a high expansion capacity and comparatively low modulus values.
- the sound absorbing material is furthermore one in which at least one of the incompatible polymers forming the multi-component endless filament contains an additive, such as color pigments, permanently acting anti-statics, flame retarding agents and/or additives that influence the hydrophobic properties, in amounts up to 10 percent by weight.
- an additive such as color pigments, permanently acting anti-statics, flame retarding agents and/or additives that influence the hydrophobic properties, in amounts up to 10 percent by weight.
- Static charges can be reduced or prevented with the additives, and the lightfastness under black-panel temperatures can be improved.
- values for lightfastness under black-panel temperatures of ⁇ 6 have been achieved, determined according to DIN EN 20105-A02.
- the method according to the invention for the production of a sound absorbing material, is made up of the steps that multi-component endless filaments are spun from the melt, stretched, and directly laid up to form a web, that prebonding takes place, and that the nonwoven fabric is bonded using high-pressure fluid jets, and, at the same time, split into micro-endless filaments having a titer of 0.1 to 1.2 dtex.
- the sound absorbing material obtained in this way is very uniform with regard to its thickness, it demonstrates an isotropic filament distribution, and it possesses no tendency to delaminate.
- the method for the production of the sound absorbing material is carried out in such a manner that the multi-component endless filaments are bonded and split in that the nonwoven fabric, which has been prebonded, if necessary, is impacted at least once on each side with high-pressure water jets.
- the sound absorbing material demonstrates a good surface and a degree of splitting of the multi-component endless filaments >80%.
- the sound absorbing material according to the invention is subjected to spot calendering in order to increase its friction wear resistance.
- the split and bonded nonwoven fabric is passed through heated rollers, at least one of which has elevations that result in melt-bonding of the filaments to one another at certain points.
- the sound absorbing material according to the invention is suited for the production of car roof linings, door paneling, column paneling, rear window shelves and/or trunk paneling, as well as wheel box paneling, because of its properties, such as good printability, a high level of friction wear resistance, as well as its good lightfastness under black-panel temperatures, its thermoformability in the deep-drawing process, and its sensory properties.
- the sound absorbing material is suitable as a sound absorbing material in the construction of roof linings, in the construction of column, door, and trunk linings, in the construction of dashboards, in the area of the engine compartment and/or floor linings, the material demonstrating good sound absorbing values at a low mass per unit area as compared with known materials.
- the sound absorbing material is suited as a tuft carrier for automobile carpeting, which possesses sound absorbing properties that are at least as good as those of conventional automobile carpeting, with a significantly lower amount of material being required, since heavy-carpet backing coatings can be eliminated.
- a filament sheet having a mass per unit area of 138 g/m 2 is produced from a side-by-side (s/s) polyester-polyamide 6.6 (PES-PA6.6) bicomponent endless filament having a titer of 2.3 dtex and a weight ratio of PES/PA6.6 of 60/40, and is subjected to water-jet needlepunching at pressures up to 230 bar, on both sides.
- the bicomponent endless filaments have a titer of ⁇ 1.2 dtex and a thickness of 0.73 mm after the water-jet needlepunching process, which results in splitting of the starting filaments, at the same time. Values of 391 N in the machine running direction and 372 N in the crosswise direction were determined for the tear strength.
- a filament sheet having a mass per unit area of 115 g/m 2 is produced from a 16 segment (pie) polyester-polyamide 6.6 (PES-PA6.6) bicomponent endless filament having a titer of 2.4 dtex and a weight ratio of PES/PA6.6 of 55/45, and is subjected to water-jet needlepunching at pressures up to 230 bar, on both sides.
- the bicomponent endless filaments have a titer of ⁇ 0.15 dtex after the water-jet needlepunching process, which results in splitting of the starting filaments, at the same time, and a thickness of 0.48 mm after a final smoothing process. Values of 302 N in the machine running direction and 303 N in the crosswise direction were determined for the tear strength.
Abstract
The invention relates to a sound absorbing material, made from a microfilament nonwoven fabric having a mass per unit area of 40 to 300 g/m2, in which a nonwoven fabric is made from melt-spun, drawn, multi-component endless filament having a titer of 1.5 to 5 dtex and directly laid down to form a fibrous web; and the multi-component endless filaments, optionally after prebonding, are split at least to 80% to form micro-endless filaments having a titer of 0.1 to 1.2 dtex and bonded.
Description
- The invention relates to a sound absorbing material, made from a microfilament nonwoven fabric having a mass per unit area of 40 to 300 g/m2.
- Paneling parts for automobile interiors, such as roof linings, which possess sound absorbing properties, are known from the documents European Patent 0 909 680 and U.S. Pat. No. 4,851,283. They are made from a staple fiber nonwoven fabric layer in which preferably polyester fibers are bonded using binding fibers, and are coated with at least one foam material layer.
- Furthermore, insulating and sound absorbing materials that are made from staple fiber nonwoven fabrics, particularly from polyester fibers, and are bonded using mechanical as well as thermal processes, are known from the documents DE 197 26 965 and DE 197 08 188.
- In the course of ever greater requirements in the automobile industry, new demands are being made on the suppliers. For example, the paneling parts used in the interior of the automobile are supposed to demonstrate attractive optical and sensory properties of the decor. The parts are supposed to be capable of recycling, to possess a very high level of resistance to color fading especially under the effects of black-panel temperatures, a low tendency to become dirty, a high level of friction wear resistance, moisture resistance, fire resistance, cleanability, and a very good capacity for deep drawing, and furthermore to take into account the increasing requirements with regard to noise absorption, with the goal of increasing the comfort of automobile passengers.
- The invention has set itself the task of indicating a sound absorbing material, as well as a method for its production, that take into account the stated requirements.
- According to the invention, the task is accomplished by a sound absorbing material that is made from a microfilament nonwoven fabric having a mass per unit area of 40 to 300 g/m2, the a nonwoven fabric being made from a melt-spun, drawn multi-component endless filament having a titer of 1.5 to 5 dtex, being directly laid up to form a fibrous web, and the multi-component endless filaments, optionally prebonded being split to micro-endless filaments having a titer of 0.1 to 1.2 dtex, up to at least 80%, and bonded. The sound absorbing material demonstrates a high level of specific fiber surface at a comparatively low mass per unit area, as well as high opacity. The fineness of the filaments permits good printability and embossability, and thereby decorative structuring of the material.
- Preferably, the sound absorbing material is one in which the nonwoven fabric is made from melt-spun, aerodynamically stretched multi-component endless filaments and directly laid up to form a fibrous web, having a titer of 1.5 to 3 dtex, and the multi-component endless filaments are split to micro-endless filaments having a titer of 0.1 to 0.3 dtex, up to a degree of 80% and bonded. The sound absorbing material demonstrates an isotropic filament distribution in the web, making further processing relatively independent of the machine running direction and thereby very advantageous for material utilization.
- Preferably, the sound absorbing material is one in which the multi-component endless filament is a bicomponent endless filament made from two incompatible polymers, particularly a polyester and a polyamide. Such a bicomponent endless filament demonstrates good splittability into micro-endless filaments and results in an advantageous ratio of strength to mass per unit area. At the same time, the sound absorbing material according to the invention is very easy to clean and wipe down, because of the polymers used and their filament structure, and demonstrates a high level of friction wear resistance, i.e. it is easy to take care of.
- Preferably, the sound absorbing material is one in which the multi-component endless filaments have a cross-section having an orange-like multi-segment structure, also called a “pie” structure, the segments alternately containing one of the two incompatible polymers in each case. In addition to this orange-like multi-segment structure of the multi-component endless filaments, a “side-by-side” (s/s) arrangement of the incompatible polymers in the multi-component endless filaments is also possible, which arrangement is preferably used for the production of crimped filaments. Such segment arrangements of the incompatible polymers in the multi-component endless filament have proven to be very easy to split. The sound absorbing material possesses a good deep drawing capacity, or deformability, which is expressed in the average strength values at a high expansion capacity and comparatively low modulus values.
- Preferably, the sound absorbing material is furthermore one in which at least one of the incompatible polymers forming the multi-component endless filament contains an additive, such as color pigments, permanently acting anti-statics, flame retarding agents and/or additives that influence the hydrophobic properties, in amounts up to 10 percent by weight. Static charges can be reduced or prevented with the additives, and the lightfastness under black-panel temperatures can be improved. Using overdyed products, values for lightfastness under black-panel temperatures of ≧6 have been achieved, determined according to DIN EN 20105-A02.
- The method according to the invention, for the production of a sound absorbing material, is made up of the steps that multi-component endless filaments are spun from the melt, stretched, and directly laid up to form a web, that prebonding takes place, and that the nonwoven fabric is bonded using high-pressure fluid jets, and, at the same time, split into micro-endless filaments having a titer of 0.1 to 1.2 dtex. The sound absorbing material obtained in this way is very uniform with regard to its thickness, it demonstrates an isotropic filament distribution, and it possesses no tendency to delaminate.
- It is advantageous if the method for the production of the sound absorbing material is carried out in such a manner that the multi-component endless filaments are bonded and split in that the nonwoven fabric, which has been prebonded, if necessary, is impacted at least once on each side with high-pressure water jets. As a result, the sound absorbing material demonstrates a good surface and a degree of splitting of the multi-component endless filaments >80%.
- It is advantageous if the sound absorbing material according to the invention is subjected to spot calendering in order to increase its friction wear resistance. For this purpose, the split and bonded nonwoven fabric is passed through heated rollers, at least one of which has elevations that result in melt-bonding of the filaments to one another at certain points.
- The sound absorbing material according to the invention is suited for the production of car roof linings, door paneling, column paneling, rear window shelves and/or trunk paneling, as well as wheel box paneling, because of its properties, such as good printability, a high level of friction wear resistance, as well as its good lightfastness under black-panel temperatures, its thermoformability in the deep-drawing process, and its sensory properties. In this connection, it is possible to do without an additional foam material coating, without suffering major losses in sound absorbing properties, if very high levels of weight savings are a concern.
- The sound absorbing material is suitable as a sound absorbing material in the construction of roof linings, in the construction of column, door, and trunk linings, in the construction of dashboards, in the area of the engine compartment and/or floor linings, the material demonstrating good sound absorbing values at a low mass per unit area as compared with known materials.
- In particular, the sound absorbing material is suited as a tuft carrier for automobile carpeting, which possesses sound absorbing properties that are at least as good as those of conventional automobile carpeting, with a significantly lower amount of material being required, since heavy-carpet backing coatings can be eliminated.
- A filament sheet having a mass per unit area of 138 g/m2 is produced from a side-by-side (s/s) polyester-polyamide 6.6 (PES-PA6.6) bicomponent endless filament having a titer of 2.3 dtex and a weight ratio of PES/PA6.6 of 60/40, and is subjected to water-jet needlepunching at pressures up to 230 bar, on both sides. The bicomponent endless filaments have a titer of <1.2 dtex and a thickness of 0.73 mm after the water-jet needlepunching process, which results in splitting of the starting filaments, at the same time. Values of 391 N in the machine running direction and 372 N in the crosswise direction were determined for the tear strength.
- A filament sheet having a mass per unit area of 115 g/m2 is produced from a 16 segment (pie) polyester-polyamide 6.6 (PES-PA6.6) bicomponent endless filament having a titer of 2.4 dtex and a weight ratio of PES/PA6.6 of 55/45, and is subjected to water-jet needlepunching at pressures up to 230 bar, on both sides. The bicomponent endless filaments have a titer of <0.15 dtex after the water-jet needlepunching process, which results in splitting of the starting filaments, at the same time, and a thickness of 0.48 mm after a final smoothing process. Values of 302 N in the machine running direction and 303 N in the crosswise direction were determined for the tear strength.
- A commercially available single-layer needlepunched nonwoven fabric made from polyester (car roof lining material) having a thickness of approximately 1.1 mm was used.
- A laminate of a knitted fabric (approximately 0.6 mm thick) and a foam material substratum (approximately 1.6 mm thick), which is typically used as a car roof lining material, was tested.
- A laminate made up of a knitted fabric (approximately 0.6 mm thick) and a polyester needlepunched nonwoven fabric (approximately 1.9 mm thick), which is typically used as a car roof lining material, was tested.
- A laminate made up of a knitted fabric (approximately 0.6 mm thick), a foam material intermediate layer (approximately 4.4 mm thick), and a nonwoven fabric substratum (approximately 0.3 mm thick), which is typically used as a car roof lining material, was tested.
- The results of the sound absorbing properties (measured in a pipe according to DIN 52215) at different frequencies are listed in Table 1.
TABLE 1 Ex. 500 625 800 900 1000 1120 1250 1400 1600 No. Hz Hz Hz Hz Hz Hz Hz Hz Hz 1 6% 12% 28% 33% 39% 46% 51% 70% 2 1% 8% 24% 34% 50% 74% 91% 95% 95% Cl 1% 5% 10% 12% 14% 16% 21% 29% C2 2% 6% 11% 12% 14% 16% 10% 27% C3 5% 11% 20% 24% 28% 35% 38% 54% C4 5% 10% 20% 25% 30% 33% 34% 71% 76%
Claims (12)
1. A sound absorbing material made from a microfilament nonwoven fabric having masses per unit area of 40 to 300 g/m2, the nonwoven fabric being made from melt-spun, drawn, multi-component endless filament having a titer of 1.5 to 5 dtex and directly laid down to form a fibrous web; and the multi-component endless filaments, optionally after prebonding, are split at least to 80% to form micro-endless filaments having a titer of 0.1 to 1.2 dtex and bonded.
2. The sound absorbing material as recited in claim 1 ,
wherein the nonwoven fabric is made from melt-spun, aerodynamically stretched multi-component endless filaments directly laid up to form a web, having a titer of 1.5 to 3 dtex, and the multi-component endless filaments, optionally after prebonding, are split at least to 80% to form micro-endless filaments having a titer of 0.1 to 0.3 dtex, and bonded.
3. The sound absorbing material as recited in claim 1 or 2,
wherein the multi-component endless filament is a bicomponent endless filament made from two incompatible polymers, particularly a polyester and a polyamide.
4. The sound absorbing material as recited in one of claims 1 to 3 ,
wherein the multi-component endless filaments have a cross-section having an orange-like multi-segment structure, whereby the segments alternately contain one of the two incompatible polymers, in each instance, and/or have a “side-by-side” structure.
5. The sound absorbing material as recited in one of claims 1 to 4 ,
wherein at least one of the incompatible polymers forming the multi-component endless filament contains an additive, such as color pigments, permanently acting anti-statics, flame retarding agents and/or additives that influence the hydrophobic properties, in amounts up to 10 percent by weight.
6. A method for the production of the sound absorbing material according to one of claims 1 to 5 ,
wherein multi-component endless filaments are spun from the melt, stretched, and directly laid up to form a web, that prebonding takes place, if necessary, and that the nonwoven fabric is bonded using high-pressure fluid jets, and, at the same time, split into micro-endless filaments having a titer of 0.1 to 1.2 dtex.
7. The method as recited in claim 6 ,
wherein the multi-component endless filaments are bonded and split in that the nonwoven fabric, which has been prebonded if necessary, is impacted at least once on each side with high-pressure water jets.
8. The method as recited in claim 6 or 7,
wherein the multi-component endless filaments are dyed by spin-dyeing and/or overdyeing.
9. The method as recited in one of claims 6 to 8 ,
wherein the sound absorbing material is spot-calandered.
10. The sound absorbing material as recited in one of claims 1 to 9 ,
wherein it is used for the production of car roof linings, door paneling, column paneling, rear window shelves and/or trunk paneling, as well as wheel box paneling.
11. The sound absorbing material as recited in one of claims 1 to 9 ,
wherein it is used as a sound absorbing layer in the construction of roof linings, in the construction of column, door, and trunk linings, in the construction of dashboards, in the area of the engine compartment and/or floor linings.
12. The sound absorbing material as recited in one of claims 1 to 9 ,
wherein it is used as a tuft carrier for automobile carpeting.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10009281.0 | 2000-02-28 | ||
DE10009281A DE10009281C1 (en) | 2000-02-28 | 2000-02-28 | Sound-damping fleece especially suited for vehicle interior cladding, is made of fine melt-spun fibers, split to microfilaments following pre-solidification |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030104749A1 true US20030104749A1 (en) | 2003-06-05 |
Family
ID=7632658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/203,905 Abandoned US20030104749A1 (en) | 2000-02-28 | 2001-01-24 | Sound absorbing material |
Country Status (9)
Country | Link |
---|---|
US (1) | US20030104749A1 (en) |
EP (1) | EP1261766B1 (en) |
AR (1) | AR027424A1 (en) |
AU (1) | AU2001228484A1 (en) |
CA (1) | CA2401442C (en) |
DE (2) | DE10009281C1 (en) |
ES (1) | ES2282273T3 (en) |
TW (1) | TW552578B (en) |
WO (1) | WO2001064991A2 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040131836A1 (en) * | 2003-01-02 | 2004-07-08 | 3M Innovative Properties Company | Acoustic web |
US20040151870A1 (en) * | 2003-02-04 | 2004-08-05 | Freudenberg Nonwovens Na | Automotive tufted carpet with enhanced acoustical properties |
US20040231915A1 (en) * | 2003-01-02 | 2004-11-25 | 3M Innovative Properties Company | Sound absorptive multilayer composite |
US20040231914A1 (en) * | 2003-01-02 | 2004-11-25 | 3M Innovative Properties Company | Low thickness sound absorptive multilayer composite |
WO2005076865A2 (en) * | 2004-02-04 | 2005-08-25 | Polymer Group, Inc. | Sound absorbing secondary nonwoven carpet back |
US20060065482A1 (en) * | 2004-09-30 | 2006-03-30 | Schmidft Richard J | Acoustic material with liquid repellency |
GB2420351A (en) * | 2004-11-13 | 2006-05-24 | Don & Low Ltd | Microfilamentous polymeric fabric |
WO2018225568A1 (en) * | 2017-06-08 | 2018-12-13 | クラレクラフレックス株式会社 | Fiber structure, molded body and sound-absorbing material |
US11541829B2 (en) | 2020-06-18 | 2023-01-03 | Freudenberg Performance Materials Lp | Acoustical baffle |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2835352B1 (en) * | 2002-01-28 | 2004-08-27 | Sofitec Sa | SEALING AND SOUNDPROOFING PANEL IN PARTICULAR FOR A MOTOR VEHICLE |
DE102007011665A1 (en) * | 2007-03-09 | 2008-09-11 | Btf Produktentwicklungs- Und Vertriebs-Gmbh | Sound-deadening fleece used under cast floors, as intermediate layer or underlay, is highly-consolidated and has specified weight and sound attenuation properties |
DE202009011197U1 (en) | 2009-07-06 | 2009-10-29 | Eswegee Vliesstoff Gmbh | Sound absorption material |
EP2573243B1 (en) | 2011-09-20 | 2015-02-11 | Firma Carl Freudenberg | Non-woven material with a matrix containing elementary filaments |
DE102011056933A1 (en) * | 2011-12-22 | 2013-06-27 | Bayerische Motoren Werke Aktiengesellschaft | Interior component for a motor vehicle |
CN105442189A (en) * | 2015-12-29 | 2016-03-30 | 苏州鑫茂无纺材料有限公司 | Method for preparing high-strength non-woven cloth |
CN106758905A (en) * | 2017-02-24 | 2017-05-31 | 湖州浩森科技股份有限公司 | A kind of removable automated cleaning sound insulation wall device |
DE102017103943A1 (en) | 2017-02-24 | 2018-08-30 | Auria Solutions Uk I Ltd. | Covering part for a motor vehicle, method and apparatus for its production |
DE102017003411A1 (en) * | 2017-04-07 | 2018-10-11 | Carl Freudenberg Kg | Thermally embossed nonwoven fabric and process for its production |
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- 2001-01-24 WO PCT/EP2001/000727 patent/WO2001064991A2/en active IP Right Grant
- 2001-01-24 DE DE50112331T patent/DE50112331D1/en not_active Expired - Lifetime
- 2001-01-24 AU AU2001228484A patent/AU2001228484A1/en not_active Abandoned
- 2001-01-24 CA CA002401442A patent/CA2401442C/en not_active Expired - Lifetime
- 2001-01-24 EP EP01955102A patent/EP1261766B1/en not_active Expired - Lifetime
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040231915A1 (en) * | 2003-01-02 | 2004-11-25 | 3M Innovative Properties Company | Sound absorptive multilayer composite |
US20040231914A1 (en) * | 2003-01-02 | 2004-11-25 | 3M Innovative Properties Company | Low thickness sound absorptive multilayer composite |
US20040131836A1 (en) * | 2003-01-02 | 2004-07-08 | 3M Innovative Properties Company | Acoustic web |
US20080073146A1 (en) * | 2003-01-02 | 2008-03-27 | 3M Innovative Properties Company | Sound absorptive multilayer composite |
US20060237130A1 (en) * | 2003-01-02 | 2006-10-26 | 3M Innovative Properties Company | Acoustic web |
US20040151870A1 (en) * | 2003-02-04 | 2004-08-05 | Freudenberg Nonwovens Na | Automotive tufted carpet with enhanced acoustical properties |
US6808786B2 (en) * | 2003-02-04 | 2004-10-26 | Freudenberg Nonwovens | Automotive tufted carpet with enhanced acoustical properties |
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WO2005076865A2 (en) * | 2004-02-04 | 2005-08-25 | Polymer Group, Inc. | Sound absorbing secondary nonwoven carpet back |
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WO2018225568A1 (en) * | 2017-06-08 | 2018-12-13 | クラレクラフレックス株式会社 | Fiber structure, molded body and sound-absorbing material |
CN110709552A (en) * | 2017-06-08 | 2020-01-17 | 可乐丽可乐富丽世股份有限公司 | Fiber structure, molded body, and sound absorbing material |
JPWO2018225568A1 (en) * | 2017-06-08 | 2020-04-16 | クラレクラフレックス株式会社 | Fiber structure, molded body and sound absorbing material |
JP7104695B2 (en) | 2017-06-08 | 2022-07-21 | クラレクラフレックス株式会社 | Fiber structure, molded body and sound absorbing material |
US11541829B2 (en) | 2020-06-18 | 2023-01-03 | Freudenberg Performance Materials Lp | Acoustical baffle |
Also Published As
Publication number | Publication date |
---|---|
DE10009281C1 (en) | 2001-03-22 |
DE50112331D1 (en) | 2007-05-24 |
WO2001064991A3 (en) | 2001-12-13 |
EP1261766A2 (en) | 2002-12-04 |
ES2282273T3 (en) | 2007-10-16 |
WO2001064991A2 (en) | 2001-09-07 |
AU2001228484A1 (en) | 2001-09-12 |
CA2401442C (en) | 2009-09-01 |
EP1261766B1 (en) | 2007-04-11 |
AR027424A1 (en) | 2003-03-26 |
TW552578B (en) | 2003-09-11 |
CA2401442A1 (en) | 2001-09-07 |
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Owner name: CARL FREUDENBERG KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EMIRZE, ARARAD;GROTEN, ROBERT;SCHUSTER, MATTHIAS;REEL/FRAME:013433/0501 Effective date: 20020904 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION |