WO2021125157A1 - Agrégat de fibres - Google Patents

Agrégat de fibres Download PDF

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Publication number
WO2021125157A1
WO2021125157A1 PCT/JP2020/046707 JP2020046707W WO2021125157A1 WO 2021125157 A1 WO2021125157 A1 WO 2021125157A1 JP 2020046707 W JP2020046707 W JP 2020046707W WO 2021125157 A1 WO2021125157 A1 WO 2021125157A1
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fiber
fiber aggregate
fibers
air
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PCT/JP2020/046707
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English (en)
Japanese (ja)
Inventor
信一 垰口
竜大 尾下
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ヤマシンフィルタ株式会社
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Priority to CN202080085304.6A priority Critical patent/CN114867896B/zh
Publication of WO2021125157A1 publication Critical patent/WO2021125157A1/fr

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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
    • 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

Definitions

  • the present invention relates to a fiber aggregate.
  • Non-woven fabrics are used in various applications such as filter media for air filters, filter media for oil filters, oil absorbents, sound absorbing materials, shock absorbing materials, heat insulating materials, and heat insulating materials.
  • Patent Document 1 describes ultrafine fibers A having a fiber diameter D of 100 to 1000 nm and the ultrafine fibers A for the purpose of providing a non-woven fabric and a bag filter filter medium having excellent pleating performance as well as collection performance.
  • a non-woven fabric containing a fiber B having a fiber diameter larger than that of the fiber A and having a Gale-type rigidity and softness of 2000 mgf or more is described.
  • Patent Document 2 describes an air filter filter medium mainly made of glass fiber for the purpose of providing an air filter filter medium that consumes less energy, has high efficiency, and has a low pressure loss.
  • the fibers contain chopped strand glass fibers and ultrafine glass fibers, and the cumulative frequency in the range of more than 1.5 ⁇ m and 2.9 ⁇ m or less in the fiber diameter distribution of the air filter filter medium is 2 to 15%.
  • a filter medium for an air filter, which is characterized by the above, is described.
  • An object of the present invention is to provide a fiber aggregate which is particularly useful as a filter medium for an air filter.
  • the present invention relates to the following ⁇ 1> to ⁇ 11>.
  • the average fiber diameter of the fibers constituting the fiber aggregate is 600 nm or more and 1500 nm or less, the content of the fibers having a fiber diameter of 1 ⁇ m or more and less than 2 ⁇ m is 10% or more and 50% or less, and the fibers constituting the fiber aggregate.
  • a fiber aggregate containing a thermoplastic resin as a main component is a thermoplastic resin as a main component.
  • ⁇ 2> The fiber aggregate according to ⁇ 1>, which contains 35% or more of fibers having a fiber diameter of 400 nm or more and less than 1000 nm.
  • ⁇ 3> The fiber aggregate according to ⁇ 1> or ⁇ 2>, wherein the content of fibers having a fiber diameter of 2 ⁇ m or more is 20% or less.
  • ⁇ 4> The fiber aggregate according to any one of ⁇ 1> to ⁇ 3>, wherein the content of fibers having a fiber diameter of 400 nm or more and less than 600 nm is 5% or more and 40% or less.
  • ⁇ 5> The fiber aggregate according to any one of ⁇ 1> to ⁇ 4>, wherein the content of fibers having a fiber diameter of 600 nm or more and less than 800 nm is 5% or more and 40% or less.
  • ⁇ 6> The fiber aggregate according to any one of ⁇ 1> to ⁇ 5>, wherein the content of fibers having a fiber diameter of 800 nm or more and less than 1000 nm is 5% or more and 40% or less.
  • ⁇ 7> The fiber aggregate according to any one of ⁇ 1> to ⁇ 6>, wherein the content of fibers having a fiber diameter of less than 400 nm is 20% or less.
  • thermoplastic resin is at least one selected from a polyolefin resin and a polyester resin.
  • thermoplastic resin is at least one selected from polypropylene and polybutylene terephthalate.
  • CV value of the basis weight of the fiber aggregate is 20% or less.
  • FIG. 1 is a schematic view showing an outline of the melt blow device 1.
  • the average fiber diameter of the fibers constituting the fiber aggregate is 600 nm or more and 1500 nm or less, the content of fibers having a fiber diameter of 1 ⁇ m or more and less than 2 ⁇ m is 10% or more and 50% or less, and the fiber assembly
  • the fibers that make up the body contain thermoplastic resin as the main component. According to the present invention, a fiber aggregate which has a low pressure loss and a high collection rate and is useful as a filter medium for an air filter can be obtained. Although the detailed reason why the above effects are obtained is unknown, some of them are considered as follows.
  • the present invention has found that by setting the average fiber diameter and the fiber diameter distribution of the fiber diameters constituting the fiber aggregate within a specific range, the fiber aggregate becomes particularly useful as a filter medium for an air filter.
  • the present invention will be described in more detail.
  • the average fiber diameter of the fibers constituting the fiber aggregate of the present invention is 600 nm or more and 1500 nm or less. When the average fiber diameter of the fibers constituting the fiber aggregate is within the above range, low pressure loss and high collection rate are obtained.
  • the average fiber diameter is preferably 700 nm or more, more preferably 800 nm or more, further preferably 900 nm or more, and preferably 1450 nm or less, more preferably 1400 nm or less, from the viewpoint of lower pressure loss and high collection rate. , More preferably 1300 nm or less.
  • the average fiber diameter of the fibers constituting the fiber aggregate is measured by the method described in Examples.
  • the content of fibers having a fiber diameter of 1 ⁇ m or more and less than 2 ⁇ m is 10% or more and 50% or less.
  • the content of the fibers having a fiber diameter of 1 ⁇ m or more and less than 2 ⁇ m is preferably 15% or more, more preferably 18% or more, further preferably 20% or more, and preferably 47% or less, more preferably 45% or less. , More preferably 42% or less.
  • the content of fibers having a fiber diameter of 1 ⁇ m or more and less than 2 ⁇ m is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of 400 nm or more and less than 1000 nm is preferably 35% or more from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. It is preferably 36% or more, more preferably 38% or more, and preferably 90% or less, more preferably 85% or less, still more preferably 75% or less.
  • the content of fibers having a fiber diameter of 400 nm or more and less than 1000 nm is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of 2 ⁇ m or more is preferably 20% or less, more preferably 18% or less from the viewpoint of obtaining a fiber aggregate having a high collection rate. , More preferably 16% or less.
  • the content of fibers having a fiber diameter of 2 ⁇ m or more is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of 400 nm or more and less than 600 nm is preferably 5% or more from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. And preferably 40% or less, more preferably 30% or less, still more preferably 25% or less.
  • the content of fibers having a fiber diameter of 400 nm or more and less than 600 nm is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of 600 nm or more and less than 800 nm is preferably 5% or more from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. It is preferably 8% or more, more preferably 10% or more, and preferably 40% or less, more preferably 35% or less, still more preferably 30% or less.
  • the content of the fiber width having a fiber diameter of 600 nm or more and less than 800 nm is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of 800 nm or more and less than 1000 nm is preferably 5% or more from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. It is preferably 6% or more, more preferably 8% or more, and preferably 40% or less, more preferably 35% or less, still more preferably 30% or less.
  • the content of the fiber width having a fiber diameter of 800 nm or more and less than 1000 nm is measured by the method described in Examples.
  • the content of the fiber having a fiber diameter of less than 400 nm is preferably 20% or less from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate, and more. It is preferably 18% or less, more preferably 15% or less. Further, the lower limit thereof is not particularly limited and may be 0%.
  • the content of fiber widths with a fiber diameter of less than 400 nm is measured by the method described in the Examples.
  • the geometric standard deviation of the fiber diameter of the entire fiber constituting the fiber aggregate of the present invention is preferably 3.0 ⁇ m or less, more preferably 2.6 ⁇ m or less, from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. It is more preferably 2.2 ⁇ m or less, and preferably 0.5 ⁇ m or more, more preferably 0.8 ⁇ m or more, still more preferably 1.0 ⁇ m or more.
  • a fiber aggregate in which the geometric standard deviation of the fiber diameter of the entire fiber is in the above range is preferable because it is excellent in in-plane uniformity.
  • the geometric standard deviation of the fiber diameter of the fiber having a fiber diameter of less than 1 ⁇ m (less than 1000 nm) is preferable from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate.
  • the geometric standard deviation of the fiber diameter of the fiber having a fiber diameter of 1 ⁇ m or more is preferably 3.0 ⁇ m from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate.
  • it is more preferably 2.0 ⁇ m or less, still more preferably 1.5 ⁇ m or less, and from the viewpoint of ease of production, it is preferably 0.1 ⁇ m or more, more preferably 0.3 ⁇ m or more, still more preferably 0.5 ⁇ m. That is all.
  • the fibers constituting the fiber aggregate of the present invention preferably have the above-mentioned fiber diameter distribution, but the case where the large diameter fiber and the small diameter fiber are not mixed and used but have a wide distribution. Depending on the case, an aggregate of fibers having two or more peaks is preferable from the viewpoint of ease of production and in-plane uniformity.
  • the fibers constituting the fiber aggregate of the present invention contain a thermoplastic resin as a main component.
  • the fiber aggregate of the present invention is preferably produced by the melt blow method as described later, and a thermoplastic resin is suitable as the fiber raw material.
  • the thermoplastic resin include polyolefin resins such as polyethylene (PE) and polypropylene (PP); polyester resins such as polybutylene terephthalate (PBT) and polyethylene terephthalate (PET); polyamide resins (PA) and the like.
  • thermoplastic resin is preferably at least one selected from a polyolefin resin and a polyester resin, more preferably at least one selected from polypropylene and polybutylene terephthalate, and further preferably polypropylene. ..
  • the thermoplastic resin may be used alone or in combination of two or more.
  • the fibers constituting the fiber assembly of the present invention contain 50% by mass or more of a thermoplastic resin, preferably 70% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, and 100. It is not more than% by mass and may be 100% by mass.
  • the fiber aggregate may contain other components in addition to the above-mentioned thermoplastic resin.
  • Other components include surfactants, colorants, phosphorus-based and phenol-based antioxidants, benzotriazole-based weather-resistant stabilizers, hindered amine-based light-resistant stabilizers, blocking inhibitors, and dispersion of calcium stearate.
  • examples include agents, lubricants, nucleating agents, pigments, softeners, hydrophilic agents, water repellents, auxiliaries, water repellents, fillers, antibacterial agents, pesticides, insect repellents, chemicals, natural oils, synthetic oils and the like.
  • the fiber aggregate of the present invention is not particularly limited as long as the above-mentioned average fiber diameter and fiber diameter distribution can be obtained, and may be produced by a dry method or a wet method, but the above-mentioned average fiber diameter and fiber may be produced.
  • the method for manufacturing a dry fiber aggregate include a melt blow method and a spunbond method.
  • it is preferable to manufacture by the melt blow method and it is more preferable to manufacture by the melt blow method in which the thermoplastic resin is melted, discharged from the nozzle of the extruder, and ejected by a high-speed high-temperature air flow.
  • the molten thermoplastic resin is discharged from above to below, and high temperature and high pressure air is blown from the air nozzle toward the discharged thermoplastic resin from a substantially horizontal direction. It is preferable to use the molten thermoplastic resin as a fibrous resin and collect the fibrous resin to produce a fiber aggregate.
  • the molten thermoplastic resin is stretched by the air blown from the air nozzle to become a fibrous resin.
  • the longer the distance to collection the lower the density of fiber aggregates tends to be obtained.
  • FIG. 1 is a schematic view showing an outline of the melt blow device 1.
  • the melt blow device 1 mainly includes a resin supply unit 10, an air flow generation unit 20, a collection unit 30, and a superheated steam supply unit 40.
  • the resin supply unit 10 mainly includes a hopper 11, an extruder 12, a die 13, and a resin nozzle 14.
  • the raw material chip of the thermoplastic resin is put into the hopper 11 and heated by a heater (not shown) provided in the extruder 12 to melt the thermoplastic resin to obtain the melted thermoplastic resin.
  • the extruder 12 pushes the molten thermoplastic resin into the die 13 by a gear pump (not shown).
  • the resin nozzle 14 is provided on the die 13 and discharges the molten thermoplastic resin. From the resin nozzle 14, the molten thermoplastic resin is discharged from the upper side to the lower side.
  • the air flow generating unit 20 mainly includes a compressor 21 that generates compressed air, a pipe 22 through which compressed air passes, a regulator 23, a heater 24 that heats the pipe 22, and an air nozzle 25.
  • the compressor 21, the pipe 22, and the heater 24 correspond to a high-temperature and high-pressure air generating unit that generates high-temperature and high-pressure air.
  • the air nozzle 25 is provided adjacent to the resin nozzle 14, and discharges high-temperature and high-pressure air generated by the high-temperature and high-pressure air generation unit.
  • the temperature of the air discharged from the air nozzle 25 may be appropriately selected depending on the type of the thermoplastic resin and the like, but from the viewpoint of obtaining a desired average fiber diameter and fiber diameter distribution, it is preferably 400 ° C.
  • the resin nozzles 14 and the air nozzles 25 are provided side by side in a row toward the back of the paper in the figure, and the arrangement direction of the air nozzles 25 is substantially parallel to the arrangement direction of the resin nozzles 14, and the air nozzles 25 are arranged.
  • the region includes an arrangement region of the resin nozzle 14.
  • High temperature and high pressure air is discharged from the air nozzle 25 in a substantially horizontal direction.
  • the flow rate of the air discharged from the air nozzle 25 is preferably 5 L / min or more, more preferably 10 L / min or more, still more preferably 15 L / min or more, from the viewpoint of obtaining a desired average fiber diameter and fiber diameter distribution. Then, it is preferably 60 L / min or less, more preferably 45 L / min or less, and further preferably 35 L / min or less.
  • the collecting portion 30 is mainly a suction drum 31 having a substantially cylindrical shape for collecting fibrous resin, a blower 32, a suction portion 33 connected to the blower 32, and a non-woven fabric around which the non-woven fabrics 51 and 52 are wound. It has rolls 34 and 35 and a take-up drum 36.
  • the non-woven fabric 51 is a base material
  • the non-woven fabric 52 is a covering material (cover material).
  • the molten polymer discharged from the resin nozzle 14 becomes fine fibers (for example, nanofibers) and is sprayed onto the suction drum 31.
  • the non-woven fabric 51 drawn from the non-woven fabric roll 34 is wound around the suction drum 31, and the fibrous resin is adsorbed on the surface of the non-woven fabric 51 by sucking air from the suction unit 33.
  • the end of the non-woven fabric 51 is provided on the take-up drum 36. As the take-up drum 36 rotates at a constant speed, the non-woven fabric 51 on which the fibrous resin is adsorbed on the surface moves toward the take-up drum 36 at a constant speed.
  • the non-woven fabric 52 drawn from the non-woven fabric roll 35 is also provided at the end of the take-up drum 36. Therefore, when the take-up drum 36 rotates at a constant speed, the non-woven fabric 52 covers the fiber layer on the surface of the non-woven fabric 51. Then, by integrating the non-woven fabric 52 covering the fiber layer on the surface of the non-woven fabric 51 by calendar processing or the like, a structure in which the fiber aggregate is sandwiched between the non-woven fabrics 51 and 52 is obtained, which is the take-up drum 36. It is wound around.
  • the base material and the coating material are not essential constituent requirements, and the fiber aggregate means a portion in which the resin discharged from the resin nozzle 14 is laminated as a fibrous resin. Therefore, the fiber aggregate of the present invention may be used in a form sandwiched between the base material and the covering material, or only the fiber aggregate may be used.
  • the superheated steam supply unit 40 supplies superheated steam to the space surrounded by the resin nozzle 14, the air nozzle 25, and the suction drum 31.
  • the space surrounded by the resin nozzle 14, the air nozzle 25, and the suction drum 31 is a region where the air blown from the air nozzle 25 fibrates the molten thermoplastic resin.
  • the superheated steam supply unit 40 mainly includes a heater 41 for generating superheated steam, a pipe 42, and a superheated steam nozzle 43.
  • the heater 41 further heats saturated steam generated by a boiler or the like (not shown) to generate superheated steam at a high temperature.
  • the superheated steam is dry steam having a temperature higher than the boiling point, and is used, for example, in a temperature range of 200 ° C.
  • the superheated steam generated by the heater 41 is supplied to the superheated steam nozzle 43 via the pipe 42, and is discharged from the superheated steam nozzle 43.
  • the superheated steam nozzles 43 are provided side by side in a row toward the back of the paper surface, and the arrangement direction of the superheated steam nozzles 43 is substantially parallel to the arrangement direction of the resin nozzle 14 and the air nozzle 25.
  • the arrangement area includes the arrangement area of the resin nozzle 14 and the air nozzle 25.
  • the central axis of the resin nozzle 14 is substantially in the vertical direction. Therefore, the molten thermoplastic resin discharged from the resin nozzle 14 falls vertically downward under its own weight. Further, the central axis of the air nozzle 25 is substantially horizontal. Therefore, the high temperature and high pressure air is blown out from the air nozzle 25 in the horizontal direction.
  • the air nozzle 25 preferably intersects the central axis of the resin nozzle 14. That is, the tip of the air nozzle 25 is preferably located in front of the central axis of the resin nozzle 14.
  • the superheated steam nozzle 43 preferably has a central axis tilted in the horizontal direction, and discharges superheated steam toward the air nozzle 25 from below and behind the air nozzle 25.
  • the superheated steam discharged from the superheated nozzle 43 flows horizontally along with the accompanying flow, and is supplied to the atmosphere surrounded by the resin nozzle 14, the air nozzle 25, and the suction drum 31.
  • the superheated steam By placing the superheated steam on the accompanying flow, the superheated steam easily spreads in the space surrounded by the resin nozzle 14, the air nozzle 25, and the suction drum 31. Since the superheated steam is supplied to the space surrounded by the resin nozzle 14, the air nozzle 25, and the suction drum 31, the molten thermoplastic resin discharged from the resin nozzle 14 is stretched in a high temperature atmosphere and becomes fibrous. Become.
  • the texture (basis weight) of the fiber aggregate is preferably 10 g / m 2 or more from the viewpoint of obtaining a fiber aggregate having a low pressure loss and a high collection rate. It is preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, even more preferably 25 g / m 2 or more, and preferably 50 g / m 2 or less, more preferably 40 g / m 2 or less, even more preferably. Is 35 g / m 2 or less.
  • the fiber aggregate of the present invention is also characterized in that it is excellent in in-plane uniformity, and the CV value of the basis weight is preferably 20% or less, more preferably 16% or less, still more preferably 12% or less, and From the viewpoint of ease of production, it is preferably 0.5% or more, more preferably 1% or more, still more preferably 2% or more.
  • the basis weight and CV value of the fiber aggregate are measured by the method described in Examples.
  • the thickness of the fiber aggregate of the present invention may be appropriately selected depending on the intended use, but when the fiber aggregate is used for an air filter application, the thickness of the fiber aggregate is preferably selected from the viewpoint of improving the collection rate. It is 30 ⁇ m or more, more preferably 45 ⁇ m or more, further preferably 60 ⁇ m or more, still more preferably 85 ⁇ m or more, still more preferably 100 ⁇ m or more, and from the viewpoint of reducing pressure loss, it is preferably 500 ⁇ m or less, more preferably 400 ⁇ m or less. It is more preferably 300 ⁇ m or less, still more preferably 240 ⁇ m or less, and even more preferably 180 ⁇ m or less.
  • the thickness of the fiber aggregate is measured by, for example, a thickness gauge manufactured by Mitutoyo Co., Ltd.
  • the thickness of the fiber aggregate may be appropriately changed according to the intended use, and in the case of a thicker fiber aggregate, the thickness may be measured by setting a ruler on the side surface and measuring the natural thickness.
  • the collection rate (collection efficiency) of particles having a diameter of 0.3 ⁇ m at a permeation wind speed of 5.3 cm / sec is preferably 55% or more, more preferably 55% or more. It is 57% or more, more preferably 60% or more.
  • the collection rate is measured by removing static electricity from the filter medium for an air filter to eliminate the effect of collecting particles due to static electricity. It has excellent collection performance by forming a fiber aggregate having a specific average fiber diameter and a distribution of fiber diameters. The collection rate is measured by the method described in Examples.
  • the pressure loss is preferably low, and the pressure loss when the permeation air velocity is 5.3 cm / sec is preferably 40 Pa or less, more preferably 35 Pa or less. , More preferably 32 Pa or less.
  • the pressure loss is measured by the method described in the examples.
  • PF value is a value indicating the balance between the collection rate and the pressure loss, and is generally used as an index indicating the performance of the filter medium for an air filter, and is represented by the following formula (1).
  • PF value (1 / kPa) -Log 10 ⁇ (100-collection rate (%)) / 100 ⁇ / (pressure loss (Pa) / 1000) (1)
  • the fiber aggregate of the present invention When the fiber aggregate of the present invention is used as a filter medium for an air filter, the PF obtained from the collection rate of particles having a diameter of 0.3 ⁇ m at a permeation wind speed of 5.3 m / sec and the pressure loss at a permeation wind speed of 5.3 m / sec.
  • the value (1 / kPa) is preferably 10 or more, more preferably 15 or more, still more preferably 18 or more.
  • the fiber aggregate of the present invention is useful as a filter medium for an air filter, but is not limited to this, and is not limited to the filter medium for an oil filter, an oil absorbing material, a heat insulating material, a heat storage material, a heat insulating material, and a sound absorbing material. It is expected to be applied to materials.
  • the fiber aggregate of the present invention may have a lower layer (base material) and an upper layer (coating material) thereof, and may be laminated with other layers to form a filter medium for an air filter or the like. It can be applied to applications.
  • the central portion (about 40 to 60 cm from the end) of the fiber aggregate having a width of about 1 m when divided into five in the width direction was used as a sample.
  • -Average fiber diameter calculation method- (1) The measured values were classified into the following classes, and the relative frequency was calculated. Less than 200nm, 200nm or more and less than 400nm, 400nm or more and less than 600nm, 600nm or more and less than 800nm, 800nm or more and less than 1,000nm, 1 ⁇ m or more and less than 2 ⁇ m, 2 ⁇ m or more and less than 3 ⁇ m, 3 ⁇ m or more and less than 5 ⁇ m
  • the class values for each class are as follows.
  • Class value 200 nm 200 nm or more and less than 400 nm; class value 300 nm 400 nm or more and less than 600 nm; class value 550 nm 600 nm or more and less than 800 nm; class value 750 nm 800 nm or more 1,000 nm; class value 850 nm 1 ⁇ m or more and less than 2 ⁇ m; class value 1,500 nm 2 ⁇ m or more and less than 3 ⁇ m; class value 2,500 nm 3 ⁇ m or more and less than 5 ⁇ m; class value 4,000 nm 5 ⁇ m or more and less than 10 ⁇ m; class value 7,500 nm 10 ⁇ m or more; class value 10,000 nm (3) The logarithmic mean value of the measured fiber diameter was taken as the average fiber diameter.
  • ⁇ Thickness> The thickness of the fiber aggregate and the non-woven fabric used as the base material and the coating material was measured using a thickness gauge (547-301) manufactured by Mitutoyo Co., Ltd.
  • a fiber aggregate having a width of about 1 m was divided into five in the width direction, and measurements were performed for each to obtain an average value.
  • the basis weight was a value obtained by measuring a sample cut into 10 cm squares with a precision balance and dividing the mass (g) by the area (0.01 m 2).
  • the CV value was calculated together with the average value.
  • CV value (%) (standard deviation of basis weight distribution / average basis weight) x 100
  • the basis weight of the air filter filter medium laminated in the order of the base material, the fiber aggregate, and the coating material was measured, and the basis weight of the base material and the coating material was subtracted to obtain the basis weight of the fiber aggregate.
  • the CV value was calculated for the basis weight of the fiber aggregate.
  • a measurement sample of a filter medium for an air filter which is laminated in the order of a base material, a fiber aggregate, and a coating material, is set in a filter holder having an inner diameter of 113 mm (effective filter medium area 100 cm 2 ), and the filter medium permeation air velocity is 5.3 cm. It was adjusted with a flow meter so that it would be / sec. Then, the pressure loss generated upstream and downstream of the sample filter medium at this time was measured with a manometer. The air filter filter medium, which is the measurement sample, was subjected to static elimination treatment in advance, and then the pressure loss was measured.
  • the static elimination of the filter medium for the air filter complies with JIS B 9908: 2011 "Performance test method for air filter unit for ventilation and electrostatic precipitator for ventilation", 5.2.3.3d) 2) IPA saturated steam exposure method. I went. Further, the base material and the covering material are formed of a coarse non-woven fabric, and have almost no effect on the pressure loss.
  • the results are shown in Table 1 below.
  • the collection efficiency was 60% or more
  • the pressure loss (pressure loss) was 32 Pa or less
  • the PF value was 15.0 or more. ..
  • Comparative Example 2 in which the content of fibers of 1 ⁇ m or more and less than 2 ⁇ m was 50% or more, a sufficient collection rate (collection efficiency) could not be obtained.
  • Comparative Example 3 in which the average fiber diameter is less than 600 nm, the pressure loss is large because there are many fine fibers.
  • Comparative Example 4 in which the content of fibers of 1 ⁇ m or more and less than 2 ⁇ m was less than 10% and the average fiber diameter was relatively small, the pressure loss was high and a sufficient PF value could not be obtained.
  • the fiber aggregate of the present invention is suitably used as a filter medium for an air filter, and is used for various non-woven fabrics such as a filter medium for an air filter, for example, a filter medium for an oil filter, an oil absorbing material, a sound absorbing material, a heat insulating material, and a heat insulating material. It is expected to be applied to such applications.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un agrégat de fibres particulièrement utile en tant que milieu filtrant pour un filtre à air.　Dans l'agrégat de fibres, le diamètre moyen des fibres constituant l'agrégat de fibres est de 600 à 1500 nm, la teneur en fibres ayant un diamètre de fibre supérieur ou égal à 1 µm mais inférieur à 2 µm est de 10 à 50 %, et les fibres constituant l'agrégat de fibres contiennent une résine thermoplastique en tant que composant principal.
PCT/JP2020/046707 2019-12-18 2020-12-15 Agrégat de fibres WO2021125157A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080085304.6A CN114867896B (zh) 2019-12-18 2020-12-15 纤维集合体

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JP2019-228650 2019-12-18
JP2019228650A JP6831132B1 (ja) 2019-12-18 2019-12-18 繊維積層体

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