WO2019059360A1 - Tissu non-tissé fabriqué par fusion-soufflage, son utilisation et son procédé de fabrication - Google Patents

Tissu non-tissé fabriqué par fusion-soufflage, son utilisation et son procédé de fabrication Download PDF

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Publication number
WO2019059360A1
WO2019059360A1 PCT/JP2018/035123 JP2018035123W WO2019059360A1 WO 2019059360 A1 WO2019059360 A1 WO 2019059360A1 JP 2018035123 W JP2018035123 W JP 2018035123W WO 2019059360 A1 WO2019059360 A1 WO 2019059360A1
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nonwoven fabric
meltblown
melt
woven fabric
absorbing material
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PCT/JP2018/035123
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English (en)
Japanese (ja)
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与弘 宮田
政之 渡邊
小菅　一彦
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オーウエル株式会社
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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
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • 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

Definitions

  • the present invention relates to a meltblown non-woven fabric which is lightweight, thick, excellent in uniformity and recyclability, and excellent in sound absorbing property, its application, and its production method.
  • the sound absorbing material for a vehicle is disposed in an engine room or a dashboard of the vehicle.
  • a sound absorbing material for vehicles provided with lightness polyester-based non-woven fabric obtained by mixing cotton with thermoplastic fiber such as polyester fiber and core-sheath type fiber is known.
  • These sound absorbing materials for vehicles have a high sound absorption coefficient in a high frequency range (2000 Hz or more).
  • a high sound absorption coefficient in the middle frequency range 500 to 2000 Hz
  • Patent Document 1 discloses that a polyester nonwoven fabric with a thickness of 10 to 30 mm is composed of ultrafine fibers of 1.0 dtex (about 10 ⁇ m) or less, and has a basis weight of 10 to 100 g / m. 2, the sound absorbing material permeability is bonded to the polypropylene resin melt blown non-woven fabric is 5 ⁇ 50cc / cm 2 ⁇ sec have been proposed. It is described that it is impossible to obtain high sound absorption performance with the meltblown nonwoven fabric alone, and high sound absorption can be obtained by providing the back air layer.
  • Patent Document 2 sprays a polyester (PBT) resin meltblown fiber so as to merge with a fiber flow of a core-sheath type binder fiber having a sheath portion made of low melting point polyethylene terephthalate, It has been proposed to make 250 g / m 2 ) and press this mixed web to make a 0.5 mm thick flow-resistant membrane.
  • PBT polyester
  • a polyethylene terephthalate (core material) and a polyethylene terephthalate-based copolymer (sheath material) are combined with a web (specific gravity 0.91 g / cm 3 ) immediately after the polypropylene resin meltblown fiber is spun.
  • Core-sheath type binder fibers (specific gravity 1.38 g / cm 3 ) are mixed to prepare a web with a basis weight of 597 g / m 2 , and this non-woven web (thickness 1.8 mm) is proposed. It is done.
  • This sound absorbing material is described to be excellent in sound absorption coefficient to sound in a frequency range of 800 Hz to 1000 Hz.
  • the thickness of the meltblown non-woven fabric is as thin as 2 mm or less.
  • the recyclability is inferior because it contains a mixed web of polypropylene and polyester.
  • the melt-blown non-woven fabric is manufactured by drawing molten resin discharged from a spinning nozzle by heated air jetted from an air nozzle, and accumulating the obtained ultrafine fibers of the resin on a screen carrier.
  • a general meltblown non-woven fabric it is difficult to suppress the generation of thick fibers due to the fusion of fibers generated at the time of molten resin discharge and the generation of polymer spheres resulting from stretch breakage to a small amount. In view of such circumstances, there is a need for meltblown nonwovens that can be highly uniform and capable of high performance.
  • Patent Document 4 discloses setting the distance between the die and the suction roll within a range of 30 to 100 mm when manufacturing an ultrafine meltblown nonwoven fabric having a number average fiber diameter of 1 ⁇ m or less.
  • the molten resin is preferably polypropylene having a melt flow rate (MFR) of 1,000 to 2,000 g / 10 min. If the melt resin is less than 1,000 g / 10 min, the discharge fibers are easily fused to each other It is described that the fiber diameter distribution becomes wide and fiber breakage tends to occur, and when it exceeds 2,000 g / 10 min, the fibers become short and the strength of the non-woven fabric decreases.
  • MFR melt flow rate
  • Patent Document 5 discloses an apparatus for producing ultrafine fibers having an average fiber diameter of 0.56 ⁇ m by using MFR of 1,300 g / 10 min. Polypropylene as a molten resin. Not mentioned.
  • the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a meltblown nonwoven fabric which is lightweight, thick, excellent in uniformity and recyclability, and suitable for sound absorbing material applications. Another object of the present invention is to provide a sound absorbing material using the above-mentioned meltblown non-woven fabric and having a good sound absorbing property in the middle frequency range from 500 to 2000 Hz. Another object of the present invention is to provide a sound absorbing material using the above-mentioned meltblown non-woven fabric, which has a good sound absorbing property in a high frequency range of 2000 Hz or more.
  • this inventor uses a propylene-type resin with a large melt flow rate value for raw material resin, A spinning nozzle and a nozzle
  • the distance between the nozzle and the screen carrier that collects the molten resin discharged from the nozzle is increased, and part or all of the molten resin discharged from the nozzle is cut in air and collected on the screen carrier. It has been found that a meltblown non-woven fabric having a thickness of 5 to 10 mm or more which can not be obtained, and further, the meltblown non-woven fabric has a good sound absorption coefficient and is suitable as a sound absorbing material.
  • the present invention is as follows.
  • the air flow rate measured according to JIS L 1913: 2010 (Frazil method) is 1 to 15 cc / cm 2 ⁇ sec
  • a meltblown non-woven fabric characterized in that a water retention rate measured according to JIS L 1913: 2010 is 200% or less.
  • the meltblown nonwoven fabric according to the above (1) wherein the thickness measured under the condition of a load of 0.13 g / cm 2 is 5 to 50 mm.
  • the LC value is 100 to 1,000 g / m 2 in basis weight, 0.01 to 0.04 g / cm 3 in density, and the linearity of the compressive load-compression strain curve measured according to KES is The meltblown nonwoven fabric according to the above (1), which is 0.3 to 0.6.
  • the meltblown nonwoven fabric according to the above (1) which has an RC value of 30 to 50%, which is compression resilience measured according to KES.
  • meltblown nonwoven fabric according to the above (1) which has a WC value, which is a compression work amount measured according to KES, of 5 to 30 N ⁇ m / m 2 .
  • WC value which is a compression work amount measured according to KES, of 5 to 30 N ⁇ m / m 2 .
  • a sound absorbing material comprising the meltblown nonwoven fabric according to any one of the above (1) to (6).
  • (8) The sound absorbing material according to (7), wherein a meltblown non-woven fabric and another non-woven fabric and / or a felt are laminated.
  • (9) The sound absorbing material according to (7) or (8), which is for a vehicle.
  • the molten propylene-based resin is discharged from a large number of spinning nozzle rows having a diameter of 200 ⁇ m or less and spaced in a straight line in the width direction, and hot air provided on both sides of the nozzle row is jetted.
  • the molten propylene-based resin discharged from the spinning nozzle is drawn by the heated air jetted from the air nozzle by an air nozzle, and blown away onto a screen carrier which suctions an accompanying air flow disposed opposite to the nozzle row.
  • the distance between the tip of the spinning nozzle array and the screen carrier is 45 cm or more, according to any one of the above (1) to (8). Method of meltblown non-woven fabric.
  • the meltblown nonwoven fabric of the present invention is lightweight, thick and excellent in uniformity. Since only propylene-based resin is used, it is excellent in recyclability. Since this meltblown nonwoven fabric has a low water retention rate and is excellent in characteristics such as sound absorption coefficient, it should be used as a sound absorbing material only by the meltblown nonwoven fabric or by laminating it with other materials such as felt and spunbond nonwoven fabric. Can. When used as a sound absorbing material for vehicles, etc., since the water retention rate is low, not only stable sound absorbing properties are obtained even if rain water intrudes, but it is difficult to generate an offensive odor caused by mold and bacteria.
  • a sound absorbing material using meltblown non-woven fabric with a relatively small average fiber diameter has good sound absorbing properties in the middle frequency range of around 500 to 2000 Hz, so it is used as a vehicle sound absorbing material etc. It is suitable.
  • a sound absorbing material using a meltblown non-woven fabric having a relatively large fiber diameter is suitable as a vehicle sound absorbing material or the like used in a portion where sound absorption in the high frequency range is desired since the sound absorbing material has good sound absorption in the high frequency range.
  • the method for producing a meltblown nonwoven fabric according to the present invention can easily produce a thick nonwoven fabric since the conventional meltblown apparatus only widens the distance between the tip of the spinning nozzle array and the carrier.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 1.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 3.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 5.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 7.
  • FIG. It is a figure which shows fiber diameter distribution of the meltblown nonwoven fabric obtained by the comparative example 1.
  • FIG. It is a figure which shows a perpendicular incidence sound absorption coefficient measurement result about the meltblown nonwoven fabric in which average fiber diameters differ.
  • Example 9 It is a figure which shows the normal incidence sound absorption coefficient measurement result of the sound absorbing material which laminated
  • FIG. 7 is an electron micrograph of the meltblown non-woven fabric obtained in Example 3.
  • 7 is an electron micrograph of the meltblown non-woven fabric obtained in Example 5.
  • 7 is an electron micrograph of the meltblown non-woven fabric obtained in Example 7.
  • It is an electron micrograph of the meltblown nonwoven fabric obtained by the comparative example 1.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 13.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 14.
  • FIG. It is a figure which shows fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 15.
  • FIG. is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 17.
  • FIG. It is a figure which shows the fiber diameter distribution of the meltblown nonwoven fabric obtained in Example 18.
  • FIG. It is a figure which shows a perpendicular incidence sound absorption coefficient measurement result about the melt blown nonwoven fabric (Example 13, 16, 18) produced with the propylene homopolymer from which MFR differs. It is a figure which shows a perpendicular incidence sound absorption coefficient measurement result about the meltblown nonwoven fabric (Example 14, 17, 19) produced with the propylene homopolymer from which MFR differs.
  • the meltblown non-woven fabric according to the present invention discharges a molten propylene-based resin from a spinning nozzle row having a large number of small holes spaced in a straight line in the width direction, and the hot air provided on both sides of the nozzle row
  • the molten propylene-based resin discharged from the spinning nozzle is drawn by the heated air jetted from the air nozzle by the jet air nozzle, and blown away onto the screen carrier which sucks the accompanying air flow disposed opposite to the nozzle row.
  • the distance between the tip of the spinning nozzle array and the screen carrier is 45 cm or more.
  • the meltblown apparatus may be a known apparatus.
  • the apparatus for producing the ultrafine fiber non-woven fabric described in FIG. 1 and FIG. 2 of JP-A-2014-088639 is a preferable example.
  • the range of 45 to 90 cm is preferable, and the range of 50 to 80 cm is more preferable.
  • the distance to 45 cm or more it is possible to obtain a meltblown non-woven fabric having an average fiber diameter in the range of 0.7 ⁇ m to 4.0 ⁇ m and a large thickness.
  • the distance to 90 cm or less stretching breakage occurs before the discharged molten propylene-based resin is deposited on the screen carrier, and the fibers become extremely short, and the nonwoven fabric strength extremely decreases. Can be prevented.
  • the nozzle pore diameter is preferably 200 ⁇ m or less in diameter, more preferably 100 to 200 ⁇ m. From the viewpoint of maintaining the uniformity of the meltblown nonwoven fabric, it is preferable that the large number of small holes have the same diameter.
  • the discharge direction from the spinning nozzle row is not particularly limited. For example, it may be horizontal (lateral), vertical or the like. The vertical direction is preferred from the viewpoint of maintaining the fabric weight and uniformity of the meltblown nonwoven fabric.
  • the propylene-based resin may, for example, be a propylene homopolymer (homopolypropylene), a propylene / ethylene random copolymer, a propylene / ethylene / 1-butene random copolymer, or a propylene block copolymer. Among them, preferred is a homopolymer of propylene.
  • the propylene-based resin preferably has a melt flow rate (MFR) (measured in accordance with ISO 1133 at a temperature of 230 ° C. and a load of 2.16 kg) of at least 1,300 g / 10 min. More preferably, it is 1,700 g / 10 minutes or more, and particularly preferably 2,000 / 10 minutes to 3,000 g / 10 minutes.
  • MFR melt flow rate
  • the molten propylene-based resin may contain an antioxidant, a stabilizer, a pigment, a dye, a flame retardant and the like as long as the effects of the present invention are not impaired.
  • the molten propylene-based resin discharged from the spinning nozzle is likely to cause stretch breakage before being blown off onto the screen carrier, and is cut.
  • a thick melt-blown nonwoven fabric is obtained in which the ultrafine fiber nonwoven fabric is accumulated.
  • the meltblown non-woven fabric of the present invention produced by the above method is composed of a propylene-based resin fiber having an average fiber diameter of 0.7 to 4.0 ⁇ m and a fiber diameter integrated frequency of more than 2.0 ⁇ m in a range of 5% or more. is important.
  • the cumulative frequency of the fiber diameter exceeding 2.0 ⁇ m is preferably 10% or more, more preferably 20% or more.
  • the fiber diameter integration frequency of more than 2.0 ⁇ m is too high, the uniformity of the non-woven fabric may be impaired, so 50% or less is more preferable.
  • the average fiber diameter of the meltblown non-woven fabric is preferably in the range of 1.0 to 4.0 ⁇ m, more preferably in the range of 1.0 to 3.0 ⁇ m.
  • the average fiber diameter is 1.0 ⁇ m or more, the air permeability and the low water retention rate can be easily secured, thereby improving the workability and the durability, and when it is 3.0 ⁇ m or less, high sound absorption in the middle and high frequency region It will be shown.
  • the meltblown non-woven fabric of the present invention is characterized in that the sound absorption zone differs depending on the average fiber diameter. That is, when the average fiber diameter is in the range of 1.0 ⁇ m to 3.0 ⁇ m, a high sound absorption coefficient is exhibited in the middle and high frequency range. When the average fiber diameter is in the range of 3.0 ⁇ m to 4.0 ⁇ m, although the sound absorption coefficient in the middle frequency range is low, it shows a high sound absorption coefficient in the high frequency range. When the average fiber diameter is in the range of 0.7 ⁇ m or more and less than 1.0 ⁇ m, a high sound absorption coefficient is exhibited only in the middle frequency range, and the sound absorption coefficient in the high frequency range is low. The reason why the sound absorption coefficient of the meltblown non-woven fabric of the present invention exhibits the above behavior is not clear, but is presumed as follows.
  • the thickness of ⁇ / 4 It is said that the arrangement of the non-woven fabric effectively absorbs the sound, especially in the case of vertical incidence.
  • the meltblown non-woven fabric having a small average fiber diameter has a small air permeability
  • the meltblown non-woven fabric having a large average fiber diameter has a large air permeability.
  • the meltblown nonwoven fabric of the present invention can be a sound absorbing material having good sound absorbing properties in the middle frequency range, the middle high frequency range, and the high frequency range, so various sound absorbing materials can be provided according to needs.
  • the aeration amount (Fragile type method) measured according to JIS L 1913: 2010 is preferably in the range of 1 to 50 cc / cm 2 ⁇ sec. More preferably in the range of 1 ⁇ 30cc / cm 2 ⁇ sec , more preferably 1 ⁇ 15cc / cm 2 ⁇ sec , particularly preferably 1 ⁇ 12cc / cm 2 ⁇ sec .
  • the air flow exceeds 50 cc / cm 2 ⁇ sec, the sound absorption coefficient decreases.
  • the air flow rate is less than 1 cc / cm 2 ⁇ sec, the wind passability deteriorates, so the resistance (pressure loss) at the time of passing becomes high. This property makes the meltblown non-woven fabric of the present invention suitable for sound absorbing material applications.
  • the water retention rate measured according to JIS L 1913: 2010 is 200% or less. More preferably, it is 100% or less, more preferably 50% or less.
  • the distance between the tip of the spinning nozzle row and the screen carrier is less than 45 cm as in a general meltblown non-woven fabric, the molten propylene resin discharged from the nozzle is supported as a continuous yarn without being cut. It is accumulated on the body. Therefore, a melt-blown non-woven fabric having high water retention can be obtained.
  • the meltblown non-woven fabric of the present invention has a low water retention rate as compared to a general meltblown non-woven fabric because part or all is a non-continuous yarn (so-called short fibers). Due to this characteristic, the sound absorbing material using the meltblown non-woven fabric of the present invention can suppress the retention of rain water and muddy water, and can suppress the deterioration of the sound absorbing material, the decrease of the sound absorption coefficient, and the generation and growth of mold and bacteria inside the sound absorbing material. If this characteristic is utilized, it can be used suitably also as various filters, a heat insulating material, etc.
  • the melt-blown nonwoven fabric of the present invention preferably has a thickness of 5 to 50 mm as measured under a load of 0.13 g / cm 2 . More preferably, it is 10 to 50 mm, further preferably 15 to 40 mm. If the thickness is insufficient, the sound absorption coefficient tends to decrease. On the other hand, the greater the thickness, the higher the sound absorption coefficient, but the lower the productivity and the worse the economic efficiency.
  • the weight and density of the meltblown non-woven fabric are preferably 100 to 1,000 g / m 2 and 0.01 to 0.04 g / cm 3 , respectively.
  • the basis weight is more preferably 150 to 800 g / m 2 , still more preferably 200 to 700 g / m 2 .
  • the basis weight is 100 g / m 2 or more, the sound absorption coefficient tends to be good.
  • productivity does not deteriorate remarkably that a fabric weight is 1,000 g / m ⁇ 2 > or less.
  • the meltblown nonwoven fabric of the present invention preferably has an LC value, which is the linearity of the compressive load-compression strain curve measured according to KES, in the range of 0.3 to 0.6.
  • the smaller the LC value the better the crushability at the initial stage of compression. That is, a highly uniform non-woven fabric is formed.
  • the LC value is more preferably in the range of 0.4 to 0.5. Thereby, it is easy to create a high density state which is easy to be crushed and compressed.
  • the WC value which is the amount of work to be compressed
  • the RC value which is the compression resilience.
  • the WC value of the meltblown nonwoven fabric is in the range of 5 to 30 N ⁇ m / m 2 , a nonwoven fabric in a high density state is easily obtained. More preferably, it is in the range of 10 to 20 N ⁇ m / m 2 . Further, when the RC value of the meltblown non-woven fabric is 30 to 50%, the sound absorbing property and the uniformity become good. More preferably, it is 40 to 50%.
  • the meltblown nonwoven fabric of the present invention preferably has a bending resistance of 60 mm or more in the longitudinal (vertical) direction and the width (lateral) direction according to the cantilever method measured according to JIS L 1913: 2010. That is, the difference between the warp direction and the warp direction in the warp direction is very small. This indicates that the meltblown nonwoven has good uniformity.
  • the bending resistance in the longitudinal (longitudinal) direction and the width (lateral) direction by the cantilever method is more preferably 70 mm or more, still more preferably 80 mm or more.
  • the meltblown non-woven fabric of the present invention may be used by being laminated with other non-woven fabric, felt, fabric (woven fabric, knitted fabric), film, paper and the like, as long as the effects of the present invention are not impaired.
  • the lamination may be performed on only one side or both sides of the meltblown nonwoven fabric.
  • Two or more meltblown nonwoven fabrics having the same or different average fiber diameter may be stacked and laminated.
  • the order of stacking and the number of layers in the case of stacking are not particularly limited.
  • mechanical entanglement methods such as needle punch and water jet punch, adhesive method using adhesive, heat fusion method, heat embossing, ultrasonic bonding, sinter bonding using adhesive resin
  • Various known methods such as a method, an adhesion method using a heat adhesive sheet, and a suturing method can be adopted.
  • the bonding method may be any suitable method such as point bonding, partial bonding, whole surface bonding and the like.
  • laminating with another non-woven fabric or felt is preferable in that the characteristics of the melt-blown non-woven fabric of the present invention can be utilized.
  • Other non-woven fabrics include spun-bonded non-woven fabrics, needle-punched non-woven fabrics, water jet-punched non-woven fabrics, melt-blown non-woven fabrics, thermal-bonded non-woven fabrics and the like.
  • the thickness of the other non-woven fabric and felt is not particularly limited, and it is preferably about 0.01 to 2 mm (more preferably 0.05 to 1 mm) if it is thin. If it is thick, it is preferably about 2 to 30 mm (more preferably 5 to 20 mm).
  • propylene resin is preferable in consideration of recyclability.
  • the melt-blown nonwoven fabric of the present invention is made of the same resin, for example, the sound absorbing material used in large amounts for vehicles can be easily recycled, and the disassembly work required when using other materials becomes unnecessary. , Improve the recyclability.
  • the meltblown non-woven fabric of the present invention may be subjected to secondary processing such as heat treatment, roll processing, shaping processing and the like.
  • the sound absorbing material of the present invention having the meltblown non-woven fabric of the present invention can be used in various applications by processing it into an appropriate thickness, size, shape, etc. by applying a known method according to its purpose and application. it can.
  • interior materials, exterior materials, etc. of vehicles cars, freight cars, aircraft, etc.
  • ships examples include interior materials and exterior materials of automobile engine rooms, ceiling materials, rear packages, door trims, interior materials such as dashboards, and the like.
  • building wall materials, refrigerators, vacuum cleaners, and electric appliances such as air conditioners.
  • the meltblown nonwoven fabric of the present invention can also be used for applications other than sound absorbing materials. Since polypropylene-based resin is used as the material, it has excellent chemical resistance, so the particulate collection function is required. For example, air filters for air conditioners, air purifiers, automobiles, etc .; excellent in insulation between electrodes For example, battery separators; filter filters; oil adsorbents; heat insulators;
  • the present invention will be more specifically described using examples and comparative examples, but the present invention is not limited to the following examples.
  • the measuring method of each characteristic value in a following example and a comparative example is as follows.
  • meltblown non-woven fabric a photograph at a magnification of 5,000 was taken using an electron microscope S-3400 manufactured by Hitachi, Ltd. One hundred fibers were arbitrarily selected, the width (diameter) of the fibers was measured, and the average diameter and the integrated fiber diameter frequency of 2.01 ⁇ m or more were calculated in percentage.
  • JIS L 1913 2010 General nonwoven fabric test method 6.2 Mass per unit area (g / m 2 ) (ISO method). Specimen size: 200 ⁇ 250 mm. Number of test pieces: 3 pieces.
  • JIS L 1913 2010 General nonwoven fabric test method 6.8.1 Permeability (JIS method) Frazier method. Number of measurements: 3 times.
  • Example 1 Propylene homopolymer (MFR: 2,000 g / 10 min) (measured according to ASTMD 1238, measured at a temperature of 230 ° C. and a load of 2.16 kg) as a thermoplastic resin, for a meltblown with a nozzle diameter of 0.15 mm ⁇ as a small hole nozzle Hot-air pressure 0.6 kg / m 3 , air amount 360 Nm 3 / h using heated air (temperature: 270 ° C.) blown out from both sides of the spinning nozzle using a meltblown non-woven fabric manufacturing apparatus equipped with a spinning nozzle After thinning and solidifying at a discharge rate of 3.8 kg / h, the fibers were collected on a screen carrier at a distance of 78 cm from the spinning nozzle to obtain a 13.5 mm thick meltblown nonwoven fabric.
  • the fiber diameter distribution of the meltblown non-woven fabric is shown in FIG. 1, and the electron micrograph is shown in FIG.
  • Example 2 The discharge time was extended by the same method as in Example 1 to obtain a 19.8 mm-thick meltblown nonwoven fabric.
  • Example 3 A melt-blown nonwoven fabric with a thickness of 16.0 mm was obtained in the same manner as in Example 1 except that the hot air pressure was changed to 0.4 kg / m 3 and the amount of air was 300 Nm 3 / h in Example 1.
  • the fiber diameter distribution of the meltblown non-woven fabric is shown in FIG. 2, and the electron micrograph is shown in FIG.
  • Example 4 The discharge time was extended by the same method as in Example 3 to obtain a meltblown non-woven fabric having a thickness of 19.4 mm.
  • Example 5 A melt-blown nonwoven fabric with a thickness of 12.5 mm was obtained in the same manner as in Example 1 except that the hot air pressure was changed to 0.3 kg / m 3 and the air amount was 260 Nm 3 / h in Example 1.
  • the fiber diameter distribution of the meltblown non-woven fabric is shown in FIG. 3, and the electron micrograph is shown in FIG.
  • Example 6 The discharge time was extended by the same method as in Example 5 to obtain a 21.9 mm-thick meltblown nonwoven fabric.
  • Example 7 Reference Example
  • MFR propylene homopolymer
  • Example 8 Reference Example The discharge time is extended in the same manner as in Example 5 except that the thermoplastic resin is changed to a propylene homopolymer (MFR: 1,300 g / 10 min) (measurement conditions are the same as in Example 1), and the thickness is A 16.3 mm meltblown nonwoven was obtained.
  • MFR propylene homopolymer
  • Example 1 In Example 1, except that the hot air pressure was changed to 0.2 kg / m 3 and the amount of air was changed to 200 Nm 3 / h, the discharge time was extended in the same manner as in Example 1, and a 20.6 mm thick meltblown nonwoven fabric I got The fiber diameter distribution of the meltblown non-woven fabric is shown in FIG. 5, and the electron micrograph is shown in FIG.
  • Comparative example 3 Two sheets of the meltblown non-woven fabric used in Comparative Example 2 were laminated. The measured thickness was 22.8 mm.
  • meltblown non-woven fabric Sound absorption of meltblown non-woven fabrics (about 16 to 22 mm in thickness) different in average fiber diameter obtained in Examples 2, 4, 6, 8 and meltblown non-woven fabrics (about 21 to 23 mm in thickness) obtained in Comparative Examples 1 and 3 The rate was measured. The measurement was carried out with the meltblown non-woven fabric portion on the sound source side. The results are shown in FIG.
  • the meltblown nonwoven fabric (average fiber diameter: 1.44 ⁇ m) of Example 2 had a good sound absorption coefficient in the medium and high frequency region.
  • the meltblown nonwoven fabric of Example 4 (average fiber diameter 2.40 ⁇ m) and Example 6 (average fiber diameter 3.82 ⁇ m) has a sound absorption coefficient in the middle frequency range lower than that in Example 2, but the middle frequency range to high The sound absorption coefficient showed a high value up to the frequency range.
  • the meltblown non-woven fabric (MFR: 1,300 g / 10 min polypropylene resin, average fiber diameter: 1.82 ⁇ m) of Example 8 had a good sound absorption coefficient in the middle frequency range, but high frequency sound absorption after 3000 Hz The rate was poor.
  • Example 9 The sound absorption coefficient of the laminate (sound absorbing material) of the meltblown nonwoven fabrics of Examples 2, 4 and 6 and Comparative Example 3 and a spunbond nonwoven fabric of 0.15 mm thickness was measured. Lamination was tested on two types: adhesiveless (non-adherent) and adhesive (thermally bonded after spraying a low melting point resin). The measurement was carried out with the meltblown non-woven fabric portion on the sound source side. The results are shown in FIG.
  • meltblown nonwoven fabric (average fiber diameter: 1.44 ⁇ m) of Example 2 had a good sound absorption coefficient in the middle frequency range regardless of the presence or absence of adhesion.
  • the sound absorption coefficient in the medium frequency to high frequency region was stable.
  • Example 10 The sound absorption coefficient of the laminate (sound absorbing material) of the meltblown nonwoven fabric of Example 2 and Comparative Example 3 and a spunbonded nonwoven fabric having a thickness of 0.15 mm was measured. The lamination was with adhesive. The results are shown in FIG.
  • the sound absorbing material in which the meltblown non-woven fabric manufactured in Example 2 is laminated has a sound absorption coefficient in the middle frequency range better than the sound absorbing material in which the meltblown non-woven fabric of Comparative Example 3 is laminated.
  • the sound absorption coefficient in the middle frequency range tends to be high.
  • Example 11 The sound absorption coefficient of the laminate (sound absorbing material) of the meltblown nonwoven fabric (about 10 mm in thickness) of Examples 1, 3, 5 and Comparative Example 2 and a spunbond nonwoven fabric of 0.15 mm in thickness was measured. As in Example 9, two layers were used for lamination, with and without adhesive. The measurement was carried out with the meltblown non-woven fabric portion on the sound source side. The results are shown in FIG.
  • the sound absorbing material in which the meltblown nonwoven fabrics produced in Examples 1, 3 and 5 were laminated had good sound absorbing properties in the medium frequency to high frequency regions with or without the adhesive. Compared with the sound absorbing material which laminated the meltblown nonwoven fabric of the comparative example 2 of the same thickness, it was excellent in the sound absorption in a medium frequency to high frequency area. From the results of FIGS. 7 and 9, it can be seen that the meltblown nonwoven fabric of the present invention exhibits excellent sound absorption in the middle frequency range by having a certain thickness.
  • Example 12 A laminate (a sound absorbing material) of meltblown nonwoven fabric obtained in Example 1 and Example 7 and felt having a thickness of 10 mm, two felts having a thickness of 10 mm laminated to a thickness of 20 mm, and sound absorption of Comparative Example 3 The sound absorption coefficient of the material was measured. The measurement was carried out with the meltblown non-woven fabric portion on the sound source side. The results are shown in FIG.
  • meltblown nonwoven fabrics produced in Example 1 had better sound absorption coefficients in the medium frequency range to the high frequency range from the results shown in FIG.
  • Example 13 Melt-blown non-woven fabric equipped with a propylene homopolymer (MFR: 1,700 g / 10 min) as a thermoplastic resin (measurement conditions the same as in Example 1) and a spinning nozzle for melt-blowing with a nozzle diameter of 0.15 mm ⁇ as a small hole nozzle Hot air pressure 0.6 kg / m 3 , air amount 360 Nm 3 / h using heated air (temperature: 320 ° C.) blown out from both sides of the spinning nozzle using a manufacturing apparatus with 640 holes, an extrusion temperature of 260 ° C. After thinning and solidifying with a discharge amount of 0.1 g / hole / min, the fibers were collected on a screen carrier at a distance of 78 cm from the spinning nozzle, to obtain a 12.4 mm thick meltblown nonwoven fabric.
  • MFR propylene homopolymer
  • Example 14 By reducing the speed of the belt conveyor in the same manner as in Example 13, a meltblown non-woven fabric having a thickness of 18.9 mm was obtained.
  • Example 15 A melt-blown nonwoven fabric with a thickness of 12.8 mm was obtained in the same manner as in Example 13 except that the amount of hot air was changed to 300 Nm 3 / h in Example 13.
  • Example 16 A melt-blown nonwoven fabric with a thickness of 12.6 mm was obtained in the same manner as in Example 1 except that the hot air temperature was changed to 320 ° C. in Example 1.
  • Example 17 The discharge time was extended by the method of Example 16 to obtain a 23.4 mm-thick meltblown nonwoven fabric.
  • Example 18 Reference Example
  • MFR 1,300 g / 10 min
  • Example 19 Reference Example
  • the discharge time was extended by the same method as in Example 18 to obtain a 21.1 mm-thick meltblown nonwoven fabric.
  • meltblown non-woven fabric (Sound absorption coefficient of meltblown non-woven fabric)
  • the sound absorption coefficient of the meltblown nonwoven fabric (12 to 13 mm in thickness) obtained in Examples 13, 16 and 18 is shown in FIG.
  • the sound absorption coefficient of the meltblown non-woven fabric (thickness 19 to 23 mm) obtained in Examples 14, 17 and 19 is shown in FIG.
  • meltblown non-woven fabric with a thickness of about 10 mm using polypropylene (PP) resin having a MFR of 1,700 g / 10 min or more had a good sound absorption coefficient in the medium frequency range to the high frequency range.
  • meltblown nonwoven fabric having a thickness of about 20 mm has a good sound absorption coefficient in the middle frequency range
  • meltblown nonwoven fabric using a polypropylene resin having MFR of 1,700 g / 10 min or more has a high maximum sound absorption coefficient. Indicated.
  • meltblown non-woven fabric of the present invention and the sound absorbing material having the same can be used for various applications including vehicle sound absorbing materials.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention concerne : un tissu non-tissé fabriqué par fusion-soufflage qui est léger et épais, tout en ayant d'excellentes uniformité et aptitude au recyclage, et qui est adapté pour utilisation en tant que matériau d'absorption sonore ; un procédé de production de ce tissu non-tissé fabriqué par fusion-soufflage ; et un matériau d'absorption sonore qui est configuré au moyen de ce tissu non-tissé fabriqué par fusion-soufflage et présente de bonnes performances d'absorption sonore dans une plage de fréquence moyenne de 500 Hz à 2 000 Hz ou dans une plage de haute fréquence de 2 000 Hz ou plus. L'invention concerne un tissu non-tissé fabriqué par fusion-soufflage qui est produit à partir d'un matériau de départ de résine de propylène, et qui est caractérisé en ce que : le tissu non-tissé fabriqué par fusion-soufflage est formé de fibres de résine de propylène qui ont un diamètre de fibre moyen de 0,7 µm à 4,0 µm et une fréquence cumulée de fibres ayant un diamètre de fibre de plus de 2,0 µm de 5 % ou plus ; et le tissu non-tissé fabriqué par fusion-soufflage a un volume de ventilation de 1 cm3/cm2 s à 15 cm3/cm2 s et un taux de rétention d'eau de 200 % ou moins tel que déterminé selon JIS L 1913 (2010). Un matériau d'absorption sonore selon la présente invention comprend le tissu non-tissé fabriqué par fusion-soufflage selon l'invention. Ce tissu non-tissé fabriqué par fusion-soufflage est produit par réglage de la distance entre une résine de propylène fondue éjectée depuis une buse de filage d'un appareil de fusion-soufflage et la surface d'un support d'écran, sur laquelle la résine de propylène fondue est accumulée, à 45 cm ou plus.
PCT/JP2018/035123 2017-09-22 2018-09-21 Tissu non-tissé fabriqué par fusion-soufflage, son utilisation et son procédé de fabrication WO2019059360A1 (fr)

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JP2014059537A (ja) * 2012-08-22 2014-04-03 Kureha Ltd 吸音材用複合不織布
JP2017066575A (ja) * 2015-09-28 2017-04-06 パナソニックＩｐマネジメント株式会社 繊維集合体及び吸音材
JP2017515010A (ja) * 2014-05-07 2017-06-08 バイアックス ファイバーフィルム 不織ウェブ
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JP2013147771A (ja) * 2012-01-20 2013-08-01 Mitsui Chemicals Inc メルトブローン不織布、その用途、及びその製造方法
JP2014059537A (ja) * 2012-08-22 2014-04-03 Kureha Ltd 吸音材用複合不織布
JP2017515010A (ja) * 2014-05-07 2017-06-08 バイアックス ファイバーフィルム 不織ウェブ
JP2017066575A (ja) * 2015-09-28 2017-04-06 パナソニックＩｐマネジメント株式会社 繊維集合体及び吸音材
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JPWO2022250057A1 (fr) * 2021-05-26 2022-12-01
WO2022250057A1 (fr) * 2021-05-26 2022-12-01 タピルス株式会社 Tissu non tissé fabriqué par fusion-soufflage et filtre comprenant celui-ci
JP7333119B2 (ja) 2021-05-26 2023-08-24 タピルス株式会社 メルトブロー不織布及びこれを備えたフィルタ
CN117230572A (zh) * 2023-09-18 2023-12-15 浙江杰上杰新材料股份有限公司 一种高端装备用中低频段吸音功能性纳米纤维的制备方法

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