WO2018151058A1 - マスク - Google Patents

マスク Download PDF

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Publication number
WO2018151058A1
WO2018151058A1 PCT/JP2018/004736 JP2018004736W WO2018151058A1 WO 2018151058 A1 WO2018151058 A1 WO 2018151058A1 JP 2018004736 W JP2018004736 W JP 2018004736W WO 2018151058 A1 WO2018151058 A1 WO 2018151058A1
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WO
WIPO (PCT)
Prior art keywords
fiber
fibers
filter sheet
sheet
mask
Prior art date
Application number
PCT/JP2018/004736
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English (en)
French (fr)
Japanese (ja)
Inventor
柴田　彰
龍一 神山
慶 若杉
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date 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 date listed.)
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=63169439&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2018151058(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to CN202110225703.4A priority Critical patent/CN112971238B/zh
Priority to CN201880006418.XA priority patent/CN110167372B/zh
Priority to JP2018568504A priority patent/JP7241544B2/ja
Publication of WO2018151058A1 publication Critical patent/WO2018151058A1/ja

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    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • 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

Definitions

  • the present invention relates to a mask.
  • Patent Document 1 discloses a mask filter.
  • An object of the present invention is to provide a mask capable of satisfying stricter standards for collection performance and ventilation performance.
  • the mask of the present invention is (1) a mask including a mask main body that covers the mouth and nose of the wearer, and the mask main body includes an inner sheet, an outer sheet, the inner sheet, and the outer sheet.
  • a ratio of the first fibers in the filter sheet is greater than a ratio of the second fibers, and the first fibers and the second fibers in the filter sheet.
  • a mask in which a ratio of fibers is 90% or more of the filter sheet, and a fiber density of the filter sheet is 0.03 to 0.10 g / cm 3 .
  • the present mask Since the present mask has the above-described configuration, it can achieve both the collection performance and the ventilation performance, which are mutually contradictory properties, as compared with a mask not having the above-described configuration, that is, improve both. be able to. Thereby, this mask can suppress that a wearer attracts
  • PM2.5 microparticulate substance
  • a fiber having a large fiber diameter is likely to be generated in a region where the fiber diameter is greatly changed, that is, a region around a fiber having a large fiber diameter, by entering a fiber having a large fiber diameter into a collection of fibers having a small fiber diameter. Therefore, the gap is easily maintained.
  • moderate gaps are present in the filter sheet, and it is possible to suppress the interval between fibers from becoming too narrow, and to improve the ventilation performance as compared with the case of using only fibers having a small fiber diameter. .
  • the fiber density of the filter sheet is relatively high, the formation of an electric field in the filter sheet by the electret treatment is hindered by the fibers, and the electret treatment may not reach the inside of the filter sheet. In that case, it is thought that the area
  • a filter that has not been electret-processed has a collection performance that is a fraction of that of a filter that has been electret-processed. Therefore, in the filter sheet having a relatively high fiber density, a region that does not contribute much to the trapping property exists in the filter sheet (impedes ventilation performance).
  • the fiber having the large fiber diameter and the fiber having the small fiber diameter are mixed and the fiber density is set to an appropriate size (0.03 to 0.10 g / cm 3 ). It can suppress that the area
  • the mask of the present invention is (2) the mask according to (1) above, wherein the ratio of the first fibers to the second fibers in the filter sheet is 5: 4 to 10: 1. May be.
  • the ratio of the first fibers to the second fibers is 5: 4 to 10: 1, and the ratio of the first fibers is sufficiently high. Therefore, the mask is charged by the above-described effects, particularly the electret treatment.
  • the effect of improving the collection performance due to the large area and the effect of suppressing the deterioration of the ventilation performance due to the moderate inclusion of fibers having a large fiber diameter can be more reliably exhibited. Thereby, both the collection performance and the ventilation performance can be achieved, that is, both can be improved together.
  • the mask of the present invention may be (3) the mask according to (1) or (2) above, wherein the filter sheet has a basis weight of 5 to 20 g / m 2 .
  • the filter sheet has a basis weight of 5 to 20 g / m 2 .
  • the above-described effects, in particular, the electret treatment extends to the inside of the filter sheet, thereby suppressing the formation of a region not subjected to the electret treatment.
  • the effect of improving the collection performance can be more reliably exhibited.
  • both the collection performance and the ventilation performance can be achieved, that is, both can be improved together.
  • the basis weight of the filter sheets 11 of each layer The amount only needs to satisfy the above range. This is because the electret treatment can be sufficiently performed on the filter sheet 11 of each layer.
  • the mask of the present invention may be (4) the mask according to any one of (1) to (3) above, wherein the filter sheet has an average fiber diameter of 2 to 5 ⁇ m.
  • the average fiber diameter is in the range of 2 to 5 ⁇ m, that is, in the range of the first fibers, and is not too thin or too thick as a whole. That is, since the fiber having a small fiber diameter and the fiber having a large fiber diameter are present in an appropriate balance while moving toward the side having a small fiber diameter, the space between the fibers is increased while increasing the area charged by the electret treatment. Can be prevented from becoming too narrow, and a decrease in the ventilation performance of the filter sheet can be suppressed. Thereby, both the collection performance and the ventilation performance can be achieved, and both can be improved together.
  • the mask of the present invention may be (5) the mask according to any one of (1) to (4), wherein the filter sheet is formed of a melt blown nonwoven fabric. Since this mask is formed of a melt blown nonwoven fabric, the fiber diameters and ratios of the first fiber and the second fiber, and the basis weight, thickness, and density of the filter sheet are set to desired values. It can be formed easily. Thereby, both the collection performance and the ventilation performance can be achieved, that is, both can be improved together.
  • the mask of the present invention is (6) the mask according to any one of (1) to (5), wherein the filter sheet is laminated in two or more layers in the thickness direction of the mask. Also good.
  • two or more (a plurality) of the above-described filter sheets having improved collection performance and ventilation performance are laminated in the thickness direction. Thereby, the fall of the ventilation performance which can fall according to the number of lamination
  • stacking of a filter sheet can be suppressed small, and collection performance can be improved more compared with the case of a single layer.
  • the fiber diameter distribution of the first fibers has a first peak of the number of the first fibers
  • the fiber diameter distribution of the second fibers has a fiber diameter of The second peak of the number of the second fibers in a range larger than 5 ⁇ m
  • the number of the first fibers of the first peak in the filter sheet is the second peak of the second peak.
  • the number of the first fibers at the first peak is larger than the number of the second fibers at the second peak. That is, the filter sheet fibers are more clearly classified into a first group of first fibers represented by the first peak and a second group of second fibers represented by the second peak. It is divided. As a result, although the fiber diameter distributions of the first fiber and the second fiber are close to each other, the separation progresses, and the collection of the electret treatment is generally maintained with the first group of the first fibers. While maintaining the performance, the pressure loss can be further lowered by making it easier to form voids in the second group of the second fibers. Thereby, the ventilation performance can be further improved without significantly changing the collection performance of the filter sheet.
  • FIG. 4 It is a schematic diagram which shows the structural example of the mask which concerns on embodiment. It is a fragmentary sectional view of the mask shown in FIG. 4 is a graph of fiber diameter distribution of the filter sheet of Example 1. 4 is a graph of fiber diameter distribution of a filter sheet of Comparative Example 1. It is a graph of fiber diameter distribution of the filter sheet of Example 5.
  • FIG. 1 is a schematic diagram showing a configuration example of a mask 1 according to an embodiment.
  • the mask 1 includes a mask main body 2 that covers the wearer's mouth and nose, and an ear hook 3 that is hung on the wearer's ear.
  • the mask body 2 includes a left half sheet 2a covering the left half of the wearer's face and a right half sheet 2a 'covering the right half of the wearer's face.
  • the left half sheet 2a and the right half sheet 2a ' are integrated by joining opposite end portions along the edge.
  • the joint 2b is formed by, for example, heat welding or an adhesive.
  • the two integrated sheets form a three-dimensional shape (three-dimensional structure) that is concave with respect to the wearer's face. be able to.
  • the ends of the ear hooks 3 are joined to the left and right sides of the mask main body 2, that is, to the ends of the left half sheet 2 a and the right half sheet 2 a ′ opposite to the joining part 2 b.
  • the joint 4 is formed by, for example, pressing, heat welding, adhesive, or the like.
  • the ear hook 3 is formed so as to extend outward from the left and right sides of the mask main body 2.
  • Openings 3a and 3a ′ extending from the mask main body 2 side toward the opposite side are formed in the ear hooking portion 3, and by inserting the wearer's ears into the openings 3a and 3a ′, The mask 1 is worn by the wearer.
  • FIG. 2 is a partial cross-sectional view of the mask 1.
  • This figure shows a cross-sectional structure of the mask body 2, that is, the left half sheet 2a and the right half sheet 2a '.
  • the mask main body 2 includes an inner sheet 12 facing the face side when worn, that is, an inner sheet 12, an outer sheet 13 facing outward when worn, and a filter sheet 11 positioned between the inner sheet 12 and the outer sheet 13. Yes.
  • FIG. 2 shows a case where the mask body 2 includes two filter sheets 11 stacked in the thickness direction.
  • the mask main body 2 may include only one filter sheet 11 or may include three or more filter sheets 11.
  • the inner sheet 12 and the outer sheet 13 hold the filter sheet 11 from both sides in the thickness direction, and maintain the shape of the mask main body 2. It is preferable that the inner sheet 12 and the outer sheet 13 have higher air permeability and higher rigidity than the filter sheet 11 from the viewpoint of their functions. It is preferable that the inner sheet 12 has a better touch. Examples of the basis weight include 20 to 50 g / m 2 , and examples of the average fiber diameter include 10 to 50 ⁇ m.
  • the material for the inner sheet 12 and the outer sheet 13 is not particularly limited as long as the above requirements are satisfied, and examples thereof include a nonwoven fabric.
  • nonwoven fabric examples include spunlace nonwoven fabric, air-through nonwoven fabric, spunbond nonwoven fabric, air laid nonwoven fabric, melt blown nonwoven fabric, flash-spun nonwoven fabric, thermal bond nonwoven fabric, carded nonwoven fabric, and a combination of some of these.
  • fibers constituting the nonwoven fabric examples include natural fibers (example: wool, cotton), regenerated fibers (example: rayon, acetate), synthetic resin fibers (example: polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate copolymer, Polyolefins such as ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ionomer resin; polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyester such as polylactic acid; polyamide such as nylon) Is mentioned.
  • natural fibers examples: wool, cotton
  • regenerated fibers examples: rayon, acetate
  • synthetic resin fibers examples include polyethylene, polypropylene, polybutylene, ethylene-vinyl acetate copolymer, Polyolefins such as ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer,
  • the fiber constituting the nonwoven fabric may be composed of a single component, or may be composed of a composite fiber such as a core / sheath fiber, a side-by-side fiber, or an island / sea fiber.
  • a single-layer nonwoven fabric may be used, and a laminate (eg, SMS nonwoven fabric) in which single-layer nonwoven fabrics are stacked may be used.
  • the filter sheet 11 When a gas such as air flows through the filter sheet 11, the filter sheet 11 is made of a virus, bacteria, dust, pollen, or fine particulate matter (PM2.5) that tends to pass through the filter sheet together with the gas. Such substances (hereinafter simply referred to as “micro substances”) are captured and collected. It is preferable that the filter sheet 11 has a higher performance for collecting minute substances than the inner sheet 12 and the outer sheet 13.
  • PM2.5 fine particulate matter
  • the filter sheet 11 is formed of an electret nonwoven fabric.
  • the electretized non-woven fabric can capture and collect minute substances in a gas by electrostatic force.
  • Such a nonwoven fabric can be obtained by applying electret treatment to the nonwoven fabric.
  • the electret treatment is a treatment for injecting electric charges into a nonwoven fabric that is a dielectric by a method such as direct current corona discharge or a high electric field. It can be considered that the electric charge injected into the nonwoven fabric exists mainly in the vicinity of the surface of the fibers of the nonwoven fabric.
  • the amount of electric charge injected into the nonwoven fabric can be controlled by the conditions of direct current corona discharge and application of a high electric field, but can also be controlled by the fiber diameter and fiber density of the nonwoven fabric.
  • the same material as that of the inner sheet 12 and the outer sheet 13 can be used, but a nonpolar polymer is preferable, and examples thereof include polypropylene, polyethylene, polystyrene, and combinations thereof.
  • the filter sheet 11 includes a first fiber having a fiber diameter of 1 ⁇ m or more and less than 5 ⁇ m, and a second fiber having a fiber diameter of 5 ⁇ m or more and less than 15 ⁇ m.
  • the ratio of the first fiber and the second fiber (based on the number of fibers) in the filter sheet 11 is 90% or more of the filter sheet 11. In other words, the ratio of the number of first fibers and the number of second fibers to the number of fibers of the filter sheet 11 is 90% or more.
  • the ratio is preferably 95% or more.
  • the ratio of the first fibers in the filter sheet 11 is larger than the ratio of the second fibers (based on the number of fibers). That is, in the filter sheet 11, the number of first fibers is larger than the number of second fibers.
  • the ratio of the fibers other than the first fibers and the second fibers (based on the number of fibers) in the filter sheet 11 is about 0 to 10%, preferably 0 to 5%.
  • Examples of the fiber diameter of fibers other than the second fiber include about 0 to 1 ⁇ m and / or about 15 to 20 ⁇ m.
  • the present filter sheet 11 includes the first fiber (1 to 5 ⁇ m) having a small fiber diameter and the second fiber (5 to 15 ⁇ m) having a large fiber diameter, and the first filter sheet 11 includes the first fiber in the filter sheet 11.
  • the reason why the ratio of the fibers is larger than the ratio of the second fibers is as follows. If the fiber density of the filter sheet 11 is constant, the surface area of the fibers per unit volume can be relatively increased as the entire filter sheet 11 by relatively increasing the proportion of the first fibers. . By subjecting such a filter sheet 11 to electret treatment, the area of the fiber surface capable of holding electric charge can be increased, and thus per unit volume (per unit basis weight if the thickness is constant). The amount of charge held can be increased.
  • the amount of minute substances that the filter sheet 11 can adsorb with static electricity can be increased, so that the collection performance of the filter sheet 11 can be improved.
  • the distance between the fibers becomes narrow. If it becomes so, the fiber density of a filter sheet will become high too much, it will become difficult for gas to pass through a filter sheet, and the ventilation performance will fall. Therefore, in the filter sheet 11, the second fiber having a large fiber diameter is mixed in the filter sheet 11 together with the first fiber. When the second fiber enters the first fiber group, the fiber diameters of the second fiber and the surrounding first fiber are greatly different.
  • the filter sheet 11 includes the first fiber and the second fiber, thereby improving the collection performance while improving the ventilation performance of the filter sheet 11. At this time, since the proportion of the first fibers is larger than the proportion of the second fibers, the effect of the electret treatment can be sufficiently enhanced while securing an appropriate gap.
  • the fiber diameter of the first fiber is set to 1 ⁇ m or more because when the number of fibers having a fiber diameter smaller than 1 ⁇ m increases, the fiber density of the filter sheet becomes relatively high, and the void around the second fiber is increased. This is because the space through which the gas passes becomes smaller as a whole because it is buried by the first fibers, and the ventilation performance is reduced.
  • the reason why the fiber diameter of the first fiber is less than 5 ⁇ m is that when the number of fibers having a fiber diameter of 5 ⁇ m or more increases, the surface area of the fiber becomes relatively small, and the electric charge retained by the electret treatment decreases. This is because the collecting performance decreases.
  • the fiber diameter of the second fiber is set to 5 ⁇ m or more and less than 15 ⁇ m because the fiber diameter range of the first fiber (1 to 5 ⁇ m) and the fiber diameter range of the second fiber (5 to 15 ⁇ m). This is to make them close.
  • the fiber diameter range (1 to 5 ⁇ m) of the first fiber and the fiber diameter range (5 to 15 ⁇ m) of the second fiber are brought close to each other for the following reason. When both ranges are separated, even if the second fiber is mixed into the filter sheet, the gap formed in the region in which the fiber diameter is greatly changed due to the mixing of the second fiber becomes too large, and the first gap is formed in the gap.
  • the fibers are easy to enter, and as a result, the voids are easily filled with the first fibers.
  • the ratio of the first fiber and the second fiber in the filter sheet 11 (based on the number of fibers) is 90% or more of the filter sheet 11 because the first fiber and the second fiber described above are used. This is because the filter sheet 11 can reliably exhibit the effect of achieving both the collection performance and the ventilation performance due to mixing.
  • the fiber density of the filter sheet 11 is 0.030 to 0.10 g / cm 3 .
  • the reason is as follows.
  • the fiber density of the filter sheet is relatively high, that is, when the fiber density is larger than 0.10 g / cm 3 , the formation of an electric field in the filter sheet by the electret treatment is hindered by the fibers, and the like.
  • the electret process does not reach the inside of the filter sheet. In that case, it can be considered that a region not subjected to the electret treatment, that is, a region with relatively little electric charge, is formed inside the filter sheet.
  • a filter that has not been electret-processed has a collection performance that is a fraction of that of a filter that has been electret-processed. Therefore, in the filter sheet having a relatively high fiber density, a region that does not contribute much to the trapping property exists in the filter sheet (impedes ventilation performance).
  • the present filter sheet 11 there is a region where the electret treatment does not reach by allowing the electret treatment to reach the inside of the filter sheet by setting the fiber density to an appropriate size and at least 0.10 g / cm 3 or less. It can suppress forming. Thereby, the area
  • the fiber density is set to an appropriate size, at least 0.03 g / cm 3 or more, thereby preventing the collection performance of the filter sheet 11 from being lowered and maintaining the shape. Yes.
  • the fiber density is preferably 0.05 to 0.08 g / cm 3 .
  • the first fiber and the second fiber are preferably formed by the same material, more preferably by the same manufacturing method. Accordingly, when the filter sheet 11 is charged by electret treatment in combination with the fiber diameter ranges of the first fiber and the second fiber being close to each other, the charging method (example: per unit area) ) Can be made substantially uniform as a whole. That is, it is possible to suppress a situation in which charging is different between the first fiber and the second fiber, which may occur when using different materials or different manufacturing methods, and uneven charging occurs in the filter sheet 11.
  • Examples of the method for producing the filter sheet 11 in the mask 1 include a melt blown method, a flash spinning method, a spunbond method, an airlaid method, and an electrospinning method.
  • the melt blown method is preferable from the viewpoint of efficiently and reliably manufacturing the filter sheet 11 having the above characteristics.
  • a method for producing the filter sheet 11 having the above characteristics for example, a method of controlling polymer characteristics and spinning conditions can be mentioned. Specifically, for example, a method of increasing the flow rate of hot gas blown to the polymer in a T-die for melt blown first fibers and decreasing the flow rate of hot gas blown to the polymer in a T-die for second fibers Is mentioned.
  • a T die for melt blown spinning a T die configured by mixing a hole for a first fiber (small hole diameter) and a hole for a second fiber (large hole diameter) at a predetermined ratio is used.
  • a method is mentioned. By these methods, it is possible to form a melt blown nonwoven fabric in which the first fibers and the second fibers have a predetermined ratio. In this case, it is preferable because two types of fibers, that is, the first fiber and the second fiber can be formed at the same time using a single T die, and can be mixed simultaneously with the formation.
  • the mask 1 having the above configuration can synergistically exhibit the above effects in the filter sheet 11. Therefore, the present mask 1 can achieve both the collection performance and the ventilation performance, which are mutually contradictory characteristics, as compared with a mask not provided with the above configuration, and can improve both. As a result, the mask 1 suppresses the amount by which the wearer inhales a minute substance such as a minute particulate matter (PM2.5) in the atmosphere to a very small amount as compared with a mask not having the above-described configuration. be able to.
  • a minute substance such as a minute particulate matter (PM2.5)
  • the ratio of the first fiber to the second fiber (based on the number of fibers) in the filter sheet 11 is 5: 4 to 10: 1 (56%: 44% to 91%). : 9%). That is, it is preferable that the ratio of the first fiber to the second fiber is 5/4 (5: 4) or more because the first fiber can be increased as compared with the case where the ratio is smaller than that. Thereby, since the area which can hold
  • the ratio of the first fiber to the second fiber is 10/1 (10: 1) or less
  • the second fiber can be increased in comparison with the case where the ratio is larger than that, which is preferable.
  • ventilation performance can be made higher.
  • the ratio of the first fiber to the second fiber is preferably 3: 2 to 5: 1 (60%: 40% to 83%: 17%), more preferably 5 : 3 to 3: 1 (63%: 37% to 75%: 25%).
  • the basis weight of the filter sheet 11 is preferably 5 to 20 g / m 2 . That is, when the basis weight is 5 g / m 2 or more, it is possible to increase the number of the first fibers and the second fibers as compared with the case where the basis weight is smaller than that. As a result, the number of electret-treated fibers can be increased, and the distance between the fibers can be further prevented from being too narrow, and the collection performance and ventilation performance can be further increased. On the other hand, when the basis weight is 20 g / m 2 or less, the thickness of the filter sheet 11 can be made relatively smaller as compared with the case where the basis weight is larger than that, which is preferable.
  • the thickness of the filter sheet 11 is preferably 0.1 to 0.18 mm.
  • the thickness is 0.1 mm or more, the number of electret-treated fibers can be relatively increased as compared with the case where the thickness is smaller than that.
  • the electret treatment can be extended to the inside of the filter sheet 11 as compared with the case where the thickness is larger than that, and formation of a region not subjected to the electret treatment can be suppressed, which is preferable.
  • the basis weight of the filter sheets 11 of each layer Even if a plurality of filter sheets 11 are laminated and the basis weight of the plurality of filter sheets 11 as a whole exceeds 20 g / m 2 , the basis weight of the filter sheets 11 of each layer The amount only needs to satisfy the above range. This is because the electret treatment can be sufficiently performed on the filter sheet 11 of each layer.
  • the average fiber diameter of the filter sheet 11 is preferably 2 to 5 ⁇ m.
  • the average fiber diameter is in the range of 2 to 5 ⁇ m, that is, in the range of the first fibers, and is not too thin or too thick as a whole. That is, since the fiber having a small fiber diameter and the fiber having a large fiber diameter are present in an appropriate balance while moving toward the side having a small fiber diameter, the space between the fibers is increased while increasing the area charged by the electret treatment. Can be prevented from becoming too narrow, and a decrease in the ventilation performance of the filter sheet can be suppressed. Thereby, both the collection performance and the ventilation performance can be achieved, that is, both can be improved together.
  • the average fiber diameter is 2 ⁇ m or more, it can be said that, for example, among the first fibers, there are few fibers having a smaller fiber diameter. As a result, it is possible to more reliably prevent a situation in which the fibers are densely packed, the distance between the fibers is narrowed, the gas is difficult to pass through the filter sheet, and the ventilation performance is deteriorated. Moreover, since an average fiber diameter is 5 micrometers or less, it can be said that there are few fibers with a larger fiber diameter among 2nd fibers, for example.
  • the fiber diameter that maximizes the number of fibers is preferably approximately 2 to 5 ⁇ m.
  • the filter sheet 11 is preferably formed of a melt blown nonwoven fabric. Since this mask 1 is formed of melt blown nonwoven fabric, the fiber diameter, the ratio of fibers, and the fiber density of the first fiber and the second fiber described above can be easily formed to a desired value. Can do. That is, the basis weight, thickness, and density of the filter sheet 11 can be easily formed to have desired values. Thereby, both the collection performance and the ventilation performance can be achieved, that is, both can be improved together.
  • the filter sheet 11 is preferably laminated in two or more layers in the thickness direction of the mask 1.
  • gas_flowing performance is laminated
  • FIG. The decrease in ventilation performance can be suppressed to a small level, and the collection performance can be further enhanced as compared with the case of a single layer. As a result, it is possible to obtain the mask 1 that significantly improves the collection performance while suppressing the deterioration of the ventilation performance as much as possible.
  • the filter sheet 11 preferably has a charge amount of 500 C (coulomb) or more per unit basis weight (g / m 2 ). This is because the smaller the amount of charge, the more minute substances can be collected. Since this mask 1 has a predetermined configuration such as the first and second fibers that have been operated on, it holds a charge amount of 500 C or more per unit basis weight (g / m 2 ) by electret treatment. Can do. Thereby, very high collection performance can be obtained.
  • the filter sheet 11 more preferably has a charge amount of 600 C or more per unit basis weight (g / m 2 ). The upper limit is not particularly limited, but is preferably 1000 C or less per unit basis weight (g / m 2 ) in view of the influence of static electricity on the human body.
  • the fiber diameter distribution of the first fibers has a first peak of the number of the first fibers in a range where the fiber diameter is larger than 1 ⁇ m and smaller than 5 ⁇ m. It is preferable to have. Furthermore, it is preferable that the fiber diameter distribution of the second fiber has a second peak of the number of the second fibers in a range where the fiber diameter is larger than 5 ⁇ m and smaller than 15 ⁇ m. And it is preferable that the number of the 1st fiber of the 1st peak in the filter sheet 11 is larger than the number of the 2nd fiber of the 2nd peak.
  • the fiber diameter distribution is exemplified by a histogram showing the relationship between the fiber diameter and the number of fibers.
  • the histogram is a graph showing the number of fibers (frequency or frequency) for each fiber diameter class (data section).
  • the width of the fiber diameter class (data section width) is, for example, k [ ⁇ m] (k is a positive value of 4/2 or less in view of the fiber diameter range of the first fiber being 4 ⁇ m (5 ⁇ m-1 ⁇ m). Number).
  • the fiber diameter distribution of the first fiber has the first peak in the histogram, in the plurality of data sections included in the fiber diameter range of the first fiber, the number of fibers (frequency or frequency). ) Means that there is a data section showing the highest value.
  • the fiber diameter distribution of the second fiber has the second peak means that the number of fibers in the plurality of data sections included in the fiber diameter range of the second fiber is the highest in the histogram. This means that there is a data section shown.
  • having the second peak in the range where the fiber diameter is larger than 5 ⁇ m excludes the minimum data section including 5 ⁇ m of the plurality of data sections of the second fiber (example: 5 ⁇ m or more and less than 6 ⁇ m).
  • the second peak is separated from the boundary (5 ⁇ m) between the first fiber and the second fiber, and the second peak is present in the data section adjacent to the boundary (for example, 5 ⁇ m or more and less than 6 ⁇ m).
  • the second peak exists in a data section that does not exist and is separated from the boundary (example: any data section including a fiber diameter of 6 ⁇ m or more). Therefore, the minimum value of the number of fibers exists in any data section up to the boundary (5 ⁇ m), which is smaller than the data section in which the second peak exists.
  • a valley of the number of fibers exists between the first peak and the second peak of the number of fibers and slightly on the second peak side from the boundary.
  • the fiber diameter distribution of the first fiber and the fiber diameter distribution of the second fiber are each substantially convex or substantially bell-shaped distribution, the valley of the number of fibers becomes clear when both are separated appropriately, When they are close, the valley of the number of fibers becomes unclear. Therefore, the degree of proximity between the two can be determined by the clarity of the existence of valleys (minimum values).
  • the second peak of the second fiber is separated from the fiber diameter of 5 ⁇ m, which is the boundary between the first fiber and the second fiber, and therefore the first fiber
  • the number of first fibers in the first peak is greater than the number of second fibers in the second peak. That is, the fibers of the filter sheet 11 are more clearly classified into a first group of first fibers represented by the first peak and a second group of second fibers represented by the second peak. It is divided into.
  • the fiber diameter distribution of the first fiber and the fiber diameter distribution of the second fiber are close to each other, the separation progresses moderately from each other, and the effect of the electret treatment in the first group of the first fibers is generally achieved.
  • While maintaining the trapping performance it is possible to more easily form voids in the second group of the second fibers and to further reduce the pressure loss. Thereby, the ventilation performance can be further improved without significantly changing the collection performance of the filter sheet.
  • the second peak exists in a data section in a range larger than 5 ⁇ m and smaller than 15 ⁇ m.
  • the second peak has a range larger than 6 ⁇ m and smaller than 12 ⁇ m from the viewpoint of appropriate separation from each other. It is preferably present in the data interval, and more preferably present in the data interval in a range larger than 6 ⁇ m and smaller than 10 ⁇ m.
  • the difference between the first peak (data section) and the second peak (data section) is preferably 2 ⁇ m or more and 10 ⁇ m or less, and preferably 3 ⁇ m or more and 8 ⁇ m or less.
  • Fiber diameter and average fiber diameter This was carried out by any one of the following methods 1 to 2.
  • the collection efficiency is an index of the collection performance. The higher the collection efficiency, the higher the collection performance.
  • the pressure loss is an index of the ventilation performance. The lower the pressure loss, the higher the ventilation performance.
  • Sheet Basis Weight, Thickness, and Fiber Density Sheet Basis Weight Ten samples of 5 cm ⁇ 5 cm were cut out from any location on the sheet to be measured. Then, the sample was dried in an atmosphere of 100 ° C. or higher, and then the mass of the sample was measured. The basis weight of the sample was calculated by dividing the measured mass by the area of the sample. A value obtained by averaging the basis weights of 10 samples was defined as the basis weight of the sheet.
  • - thickness of the sheet using a thickness with a measuring element of 15cm 2 meter Model FS-60DS (Daiei Kagaku Seiki Mfg. Co., Ltd.), measuring the thickness of the sheet under the conditions of measuring load of 3 g / cm 2 did.
  • the thickness of arbitrary three places of the sheet to be measured was measured, and the average value of the thicknesses of the three places was taken as the sheet thickness.
  • -Fiber density of sheet The fiber density of the sheet was calculated by dividing the basis weight of the sheet determined by the above method by the thickness of the sheet determined by the above method.
  • the starting point of the data section division was set to 0 ⁇ m, and the interval h was sequentially added to the starting point value to determine each data section up to the data section including at least the maximum value.
  • a histogram was created with the horizontal axis representing the data section (fiber diameter) and the vertical axis representing the frequency ratio (number ratio), that is, the number of each data section / total number ⁇ 100 (%).
  • the filter sheet for the mask 1 was evaluated as follows, assuming the case of using one sheet and the case of using two sheets in a stacked manner. Table 1 summarizing the evaluation results is shown at the end. This will be specifically described below.
  • Example 1 In the case of one filter sheet (Example 1) As a sample of Example 1, a filter sheet 11 (one sheet, single layer) formed of a melt blown nonwoven fabric was prepared so that the basis weight was about 10 g / m 2 . The filter sheet 11 was measured for fiber diameter and average fiber diameter, basis weight, thickness and fiber density, charge amount, collection efficiency and pressure loss.
  • the ratio of the number of first fibers (fiber diameter 1 to 5 ⁇ m) is 73%
  • the ratio of the number of second fibers (fiber diameter 5 to 15 ⁇ m) is 27%
  • the first fibers and the second fibers The ratio of the number of fibers is 100% (> 90%)
  • the average fiber diameter is 4.12 ⁇ m
  • the basis weight is 10.5 g / m 2
  • the thickness is 0.150 mm
  • the fiber density is 0.070 g / cm 3
  • the charge amount per amount ((g / m 2 ) ⁇ 1 ) was as high as 629.3C.
  • FIG. 3 is a histogram showing the fiber diameter distribution (based on the number of fibers) of the filter sheet 11 of Example 1.
  • the horizontal axis represents the data section, and the fiber diameter for each 1 ⁇ m starting from 0 ⁇ m.
  • the data section “1” ⁇ m includes a fiber diameter of 0 ⁇ m or more and less than 1 ⁇ m.
  • the vertical axis indicates the frequency of each data section, and indicates the ratio (%) of the number of fibers in each data section to the number of fibers in all data sections in 1% increments. The numbers after the decimal point are rounded off.
  • the frequency was very high in the data section with the fiber diameter of 2 to 4 ⁇ m, and particularly the highest in the data section of 4 ⁇ m.
  • the first peak was present in the 4 ⁇ m data interval.
  • the second peak was present in the 6 ⁇ m data interval. Therefore, the second peak was present in the data section adjacent to the boundary (5 ⁇ m) between the first fiber and the second fiber.
  • the collection efficiency and pressure loss of the filter sheet 11 were measured.
  • the numerical values do not change depending on the presence or absence of the inner sheet 12 and the outer sheet 13, so the collection efficiency and pressure loss of the filter sheet 11 are the collection efficiency and pressure loss of the mask 1. (The same shall apply hereinafter).
  • the collection efficiency was as high as 83.3%, and the pressure loss was as low as 38 Pa. That is, it was found that the filter sheet 11 of Example 1 has good collection performance and ventilation performance.
  • Example 2 As a sample of Example 2, a filter sheet 11 (one sheet, single layer) formed of a melt blown nonwoven fabric was prepared so that the basis weight was about 7 g / m 2 . And about the filter sheet
  • the collection efficiency and pressure loss of the filter sheet 11 were measured. As a result, the collection efficiency was as extremely high as 87.5%, and the pressure loss was as extremely low as 29 Pa. That is, it was found that the filter sheet 11 of Example 2 also has good collection performance and ventilation performance.
  • Example 5 As a sample of Example 5, a filter sheet 11 (one sheet, single layer) formed of a melt-blown nonwoven fabric is prepared so that the basis weight is about 10 g / m 2 and the ratio of the first fibers is relatively large. did.
  • the filter sheet 11 was measured for fiber diameter and average fiber diameter, basis weight, thickness and fiber density, charge amount, collection efficiency and pressure loss.
  • the ratio of the number of the first fibers (fiber diameter 1 to 5 ⁇ m) was 81%
  • the ratio of the number of the second fibers (fiber diameter 5 to 15 ⁇ m) was 18%
  • the average fiber diameter was 3.34 ⁇ m
  • the amount was 10.5 g / m 2
  • the thickness was 0.150 mm
  • the fiber density was 0.070 g / cm 3 .
  • FIG. 5 is a histogram showing the fiber diameter distribution (based on the number of fibers) of the filter sheet 11 of Example 5.
  • the horizontal axis and the vertical axis are the same as those in FIG.
  • the fiber diameter distribution of the first fibers (1 to 5 ⁇ m) is the most frequent in the 2 ⁇ m data section, and therefore has the first number of peaks in the 2 ⁇ m data section. It was.
  • the fiber diameter distribution of the second fiber (5 to 15 ⁇ m) is most frequent in the 7 ⁇ m data section in the range where the fiber diameter is larger than 5 ⁇ m, and therefore has a second peak number in the 7 ⁇ m data section.
  • the second peak of the second fiber is separated from the fiber diameter of 5 ⁇ m, which is the boundary between the first fiber and the second fiber, and thus separated from the range of the first fiber and the first peak.
  • the second peak was present in a data section that was not adjacent (separated) from the boundary (5 ⁇ m) between the first fiber and the second fiber.
  • the filter sheet 11 of Example 5 is represented by the first group of the first fibers represented by the first peak and the second peak. It was more clearly divided into a second group of second fibers. And the frequency (ratio of the number) of the 1st fiber of the 1st peak in filter sheet 11 was more than the frequency (ratio of the number) of the 2nd fiber of the 2nd peak. The frequency (ratio of the number) was about 31% for the first peak and about 5% for the second peak.
  • the collection efficiency and pressure loss of the filter sheet 11 were measured. As a result, the collection efficiency was as high as 79.6%, and the pressure loss was as low as 37 Pa. That is, it was found that the filter sheet 11 of Example 5 was good in both the collection performance and the ventilation performance in the same manner as the filter sheet 11 of Example 1.
  • Comparative Example 1 As a sample of Comparative Example 1, a filter sheet (one sheet, a single piece) formed of a melt-blown nonwoven fabric manufactured by a manufacturing method different from the manufacturing methods of Examples 1 and 2 so that the basis weight is about 20 g / m 2. Layer). The filter sheet was measured for fiber diameter and average fiber diameter, basis weight, thickness and fiber density, charge amount, collection efficiency and pressure loss.
  • the ratio of the number of first fibers was 45%
  • the ratio of the number of second fibers was 55%
  • the average fiber diameter was 5.44 ⁇ m
  • tsubo The amount was 21.5 g / m 2
  • the thickness was 0.196 mm
  • the fiber density was 0.11 g / cm 3
  • the charge amount per unit basis weight ((g / m 2 ) ⁇ 1 ) was as low as 481.7 C. .
  • FIG. 4 is a histogram showing the fiber diameter distribution (based on the number of fibers) of the filter sheet of Comparative Example 1.
  • the horizontal axis and the vertical axis are the same as those in FIG.
  • the frequency was generally about the same in the data section with the fiber diameter of 3 to 7 ⁇ m, and particularly the highest in the data section of 6 ⁇ m. That is, the first peak was present in the 3 ⁇ m and 4 ⁇ m data intervals.
  • the second peak was present in the 6 ⁇ m data interval. Therefore, the second peak was present in the data section adjacent to the boundary (5 ⁇ m) between the first fiber and the second fiber.
  • the production method is the same, but the average fiber diameter is relatively small because the production is performed such that the proportion of the first fibers is relatively large.
  • the fiber density was almost the same.
  • the pressure loss of the sample of Example 5 was reduced as compared with the sample of Example 1.
  • the fiber diameter distributions of the first fiber and the second fiber are close to each other, the separation has progressed, making it easier to create voids in the region around the second fiber and further reducing the pressure loss. it is conceivable that.
  • the fiber density is preferably about 0.030 to 0.10 g / cm 3 .
  • the ratio of the first fiber to the second fiber (based on the number of fibers) in the filter sheet 11 is preferably about 5: 4 to 10: 1.
  • the basis weight of the filter sheet 11 is preferably about 5 to 20 g / m 2 .
  • the average fiber diameter of the filter sheet 11 is preferably about 2 to 5 ⁇ m.
  • the charge amount per unit basis weight ((g / m 2 ) ⁇ 1 ) of the filter sheet 11 is preferably approximately 500 C or more.
  • the second peak is preferably present in a data interval in a range larger than 6 ⁇ m and smaller than 12 ⁇ m. It was found that the difference between the first peak data interval and the second peak data interval is preferably 2 ⁇ m or more and 10 ⁇ m or less.
  • Example 3 In the case of two filter sheets (Example 3) As a sample of Example 3, a filter sheet 11 in which two filter sheets 11 of Example 1 were laminated in the thickness direction was prepared. About the laminated
  • Example 4 As a sample of Example 4, a filter sheet 11 in which two filter sheets 11 of Example 2 were laminated in the thickness direction was prepared. About the laminated
  • Example 6 As a sample of Example 6, a filter sheet 11 in which two filter sheets 11 of Example 5 were laminated in the thickness direction was prepared. About the laminated
  • Example 6 Although the fiber diameter distributions of the first fiber and the second fiber are close to each other, the separation of both distributions proceeds, and the two filter sheets 11 are laminated while ensuring a gap. As a result, the flow path (void) of the microparticles becomes long. Therefore, it is possible to make it difficult for the fine particles to pass through the voids while allowing the gas to easily flow through the flow channels (voids).
  • the sample of Example 6 has a higher pressure loss than the sample of Example 3 without changing the collection efficiency much (97.1% ⁇ 95.4%: 1.8 points decrease). Can be reduced (84 Pa ⁇ 75 Pa: 11% decrease). That is, while maintaining the effect of the electret treatment with the first group of the first fibers, the voids can be more easily generated in the second group of the second fibers, and the pressure loss can be further reduced.
  • Comparative Example 2 As a sample of Comparative Example 2, a filter sheet in which two filter sheets of Comparative Example 1 are stacked in the thickness direction is prepared. The collection efficiency and pressure loss were measured for the laminated filter sheets. As a result, it was found that the collection efficiency was as high as 85.3%. That is, it was found that the filter sheet 11 of Comparative Example 2 has improved collection performance. However, since the two filter sheets were laminated, the pressure loss was approximately twice as high as the pressure loss when there was one filter sheet, that is, 111 Pa. It has been found that the pressure loss value is very large when there are two filter sheets because the pressure loss value is large when there is one filter sheet.
  • the characteristics equivalent to the characteristics of the collection efficiency of 90% or more and the pressure loss of 90 Pa or less in the evaluation method of (2) collection efficiency and pressure loss. Is required.
  • the collection efficiencies are 83.3%, 87.5% and 79.6%, which are very close values, respectively. % Has not reached slightly.
  • Example 4 and Example 6 two filter sheets 11 of Example 1, Example 2, and Example 5 were stacked to obtain a collection efficiency of 97.1%. It has been found that very good characteristics satisfying the requirement of 90% or more, such as 98.4% and 95.4%, can be obtained.
  • the pressure loss exhibits good characteristics satisfying the requirement of 90 Pa or less, such as 84 Pa, 60 Pa, and 75 Pa, respectively. That is, it was found that the mask 1 capable of satisfying the standard of GB / T32610-2016 can be formed by laminating two filter sheets 11 of Example 1, Example 2 and Example 3. .
  • Comparative Example 2 even when two filter sheets of Comparative Example 1 are laminated, the collection efficiency is 85.3%, which cannot satisfy the requirement of 90% or more, and the pressure loss is 111 Pa, which is 90 Pa or less. I was not satisfied.
  • These are a method of using two or more layers of thin filter sheets subjected to electret treatment, rather than using a thick filter sheet subjected to electret treatment, as a method for further improving the collection performance and ventilation performance. Is valid.
  • the absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined and changed without departing from the object and spirit of the present invention.

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  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pulmonology (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Filtering Materials (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
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