WO2021153312A1 - 積層不織布および衛生材料 - Google Patents

積層不織布および衛生材料 Download PDF

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Publication number
WO2021153312A1
WO2021153312A1 PCT/JP2021/001466 JP2021001466W WO2021153312A1 WO 2021153312 A1 WO2021153312 A1 WO 2021153312A1 JP 2021001466 W JP2021001466 W JP 2021001466W WO 2021153312 A1 WO2021153312 A1 WO 2021153312A1
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WIPO (PCT)
Prior art keywords
woven fabric
laminated
fiber
thermoplastic resin
fabric layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/001466
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English (en)
French (fr)
Japanese (ja)
Inventor
森岡英樹
梶原健太郎
船津義嗣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
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Toray Industries Inc
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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Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to CN202180010972.7A priority Critical patent/CN115003872B/zh
Priority to KR1020227028890A priority patent/KR20220128439A/ko
Priority to JP2021513472A priority patent/JP7661879B2/ja
Publication of WO2021153312A1 publication Critical patent/WO2021153312A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • 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
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • 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
    • 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
    • D04H3/08—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
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

  • the present invention relates to a different cross-section laminated non-woven fabric which is excellent in water absorption and quick-drying and is particularly suitable for use as a sanitary material, and a sanitary material using the same.
  • sanitary materials such as disposable diapers, sanitary napkins, and masks quickly remove water such as urine and sweat and keep the surface of the members dry, making them comfortable sanitary materials for the human body.
  • the surface member that comes into direct contact with the skin needs to have both "water absorption” that quickly absorbs moisture and “quick drying” that transfers the absorbed moisture from the outermost surface layer to make the surface dry.
  • Patent Document 1 In order to make the surface member excellent in "quick-drying" because moisture does not easily remain in the outermost surface layer, in Patent Document 1, a web layer (skin surface side) made of fine fine fibers having a round cross section and a thick fineness having an irregular cross section are used. A non-woven fabric in which a web layer made of fibers is laminated has been proposed. Further, Patent Document 2 proposes a sheet in which sheets having different fiber densities are laminated and a sheet having a low fiber density is used as a surface layer that comes into contact with the skin.
  • an object of the present invention is to provide a laminated non-woven fabric having a sufficient water absorption rate and quick-drying property for maintaining comfort in a member using a non-woven fabric for protective materials.
  • the present inventors have laminated a non-woven fabric layer made of a specific irregular cross-sectional fiber and a non-woven fabric layer made of a fiber of a specific size in a specific configuration in a laminated non-woven fabric. As a result, it was found that a laminated non-woven fabric having sufficient water absorption and quick-drying properties for use as a non-woven fabric for protective materials can be obtained.
  • the laminated non-woven fabric of the present invention is a laminated non-woven fabric in which at least one layer of a non-woven fabric layer (A) made of a first thermoplastic resin fiber and a non-woven fabric layer (B) made of a second thermoplastic resin fiber are laminated.
  • the cross section of the first thermoplastic resin fiber is a deformed cross section having a plurality of convex portions and having a lobularity of 5.0% or more in the cross section, and is an average of the first thermoplastic resin fibers.
  • the ratio (Db / Da) of the average single fiber diameter Db of the second thermoplastic resin fiber to the single fiber diameter Da is 1.0 or more, and the non-woven fabric layer (B) is laminated on at least one outermost layer. It becomes.
  • the sanitary material of the present invention is composed of at least a part of the above-mentioned laminated non-woven fabric.
  • the top sheet is made of the laminated non-woven fabric.
  • the inner surface layer is made of the laminated non-woven fabric.
  • the laminated non-woven fabric of the present invention has a sufficient water absorption rate and quick-drying property for use as a non-woven fabric for protective materials.
  • a sanitary material having excellent water absorption and excellent quick-drying property can be obtained.
  • the laminated non-woven fabric of the present invention can be used as a part of sanitary materials such as disposable diapers, sanitary napkins, gauze, bandages, masks, gloves, and adhesive plasters.
  • thermoplastic resin fiber which constitutes the nonwoven fabric layer (A) of the laminated nonwoven fabric of this invention, and is the figure for demonstrating the cross section of the fiber which has a plurality of convex portions. It is an example of the cross section of the first thermoplastic resin fiber constituting the non-woven fabric layer (A) of the laminated non-woven fabric of the present invention, and is a figure for demonstrating the degree of roval in the fiber cross section.
  • the laminated non-woven fabric of the present invention is a laminated non-woven fabric in which at least one layer of a non-woven fabric layer (A) made of a first thermoplastic resin fiber and a non-woven fabric layer (B) made of a second thermoplastic resin fiber are laminated.
  • the cross section of the first thermoplastic resin fiber is a deformed cross section having a plurality of convex portions and having a lobularity of 5.0% or more in the cross section, and is an average of the first thermoplastic resin fibers.
  • the ratio (Db / Da) of the average single fiber diameter Db of the second thermoplastic resin fiber to the single fiber diameter Da is 1.0 or more, and the non-woven fabric layer (B) is laminated on at least one outermost layer. It becomes.
  • the components thereof will be described in detail below.
  • the laminated non-woven fabric of the present invention comprises a non-woven fabric layer (A) made of a first thermoplastic resin fiber and a non-woven fabric layer (B) made of a second thermoplastic resin fiber.
  • thermoplastic resin fiber refers to a fiber made of a thermoplastic resin.
  • a thermoplastic resin may be one kind or may be composed of a plurality of thermoplastic resins.
  • thermoplastic resin used for the thermoplastic resin fiber according to the present invention examples include aromatic polyester-based polymers such as "polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyhexamethylene terephthalate" and copolymers thereof.
  • Aliper polyester polymers such as "polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyhydroxybutyrate-polyhydroxyvariate copolymer, polycaprolactone” and copolymers thereof, "polyamide” 6, Polyamide 66, Polyamide 610, Polyamide 10, Polyamide 12, Polyamide 6-12 “and other aliphatic polyamide-based polymers and their copolymers," Polypropylene, Polyethylene, Polybutene, Polymethylpentene "and other polyolefin-based polymers and their copolymers.
  • Copolymer water-insoluble ethylene-vinyl alcohol copolymer containing 25 mol% to 70 mol% of ethylene units
  • Polymer polystyrene-based, polydiene-based, chlorine-based, polyolefin-based, polyester-based, polyurethane-based, polyamide-based, fluorine It is an elastomer-based polymer or the like.
  • the thermoplastic resin can be selected from these and used.
  • various additions such as inorganic substances such as titanium oxide, silica and barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers are added.
  • the agent may be contained in the polymer.
  • thermoplastic resin used for the thermoplastic resin fiber according to the present invention contains a fatty acid amide compound.
  • the content of the fatty acid amide compound is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, still more preferably 1.0% by mass or more, so that the fatty acid amide compound can be used as a lubricant on the fiber surface. Since it acts, it can be a laminated non-woven fabric having an excellent tactile sensation.
  • the upper limit of the content of the fatty acid amide compound in the present invention is not particularly limited, but is preferably 5.0% by mass or less from the viewpoint of cost and productivity.
  • the content of the fatty acid amide compound contained in the thermoplastic resin is preferably 0.5 to 5.0% by mass, more preferably 0.7% by mass to 5.0% by mass, still more preferably. It is 1.0% by mass to 5.0% by mass.
  • the fatty acid amide compound preferably has 15 or more and 50 or less carbon atoms.
  • the fatty acid amide compound having 15 or more and 50 or less carbon atoms include a saturated fatty acid monoamide compound, a saturated fatty acid diamide compound, an unsaturated fatty acid monoamide compound, and an unsaturated fatty acid diamide compound.
  • the carbon number in the present invention means the carbon number contained in the molecule.
  • fatty acid amide compound examples include palmitic acid amide, palmitreic acid amide, stearic acid amide, oleic acid amide, elaidic acid amide, vacenoic acid amide, linoleic acid amide, linolenic acid amide, pinolenic acid amide, and eleostearic acid.
  • Examples thereof include bisoleic acid amide, and a plurality of these can be used in combination.
  • the number of carbon atoms of the fatty acid amide compound By setting the number of carbon atoms of the fatty acid amide compound to preferably 15 or more, more preferably 23 or more, and further preferably 30 or more, it is possible to suppress excessive precipitation of the fatty acid amide compound on the fiber surface, resulting in spinnability and processing stability. It is excellent in and can maintain high productivity. Further, by setting the number of carbon atoms of the fatty acid amide compound to preferably 50 or less, more preferably 45 or less, and further preferably 42 or less, the fatty acid amide compound is appropriately precipitated on the fiber surface, so that the laminated non-woven fabric has an excellent tactile sensation. Become.
  • the fatty acid amide compound preferably has 15 to 50 carbon atoms, more preferably 23 to 45 carbon atoms, and even more preferably 30 to 42 carbon atoms.
  • the first thermoplastic resin fiber and the second thermoplastic resin fiber may have the same or different thermoplastic resins.
  • Nonwoven fabric layer (A) made of first thermoplastic resin fiber The nonwoven fabric layer (A) according to the laminated stretchable nonwoven fabric of the present invention is made of the first thermoplastic resin fiber, and the cross section of the first thermoplastic resin fiber has a plurality of convex portions.
  • the fact that the cross section of the fiber has a plurality of convex portions means the cross-sectional shape described below, which will be described with reference to FIG.
  • FIG. 1 shows an example of a fiber cross section having a plurality of convex portions.
  • the cross-sectional shape as described above is a fiber cross-section having a plurality of convex portions.
  • a groove continuous in the fiber axis direction is formed on the side surface of the fiber.
  • the fiber cross section having a plurality of convex portions is one of the key elements for exerting the effect of the present invention. That is, when such a fiber is used as a non-woven fabric, the groove portion on the side surface of the fiber serves as a liquid passage path, so that it is possible to diffuse water in the direction of the non-woven fabric surface, which has been difficult until now. Therefore, the laminated non-woven fabric of the present invention can significantly improve the water absorption rate and the liquid transfer from the surface layer by including the non-woven fabric layer (A) capable of diffusing water in the surface direction.
  • the shape of the convex portion of the fiber cross section is important, and it is also important that the fiber cross section has a deformed cross section having a roval degree of 5.0% or more. Is.
  • the degree of roval of the fiber cross section is measured by the method described below, and will be described in detail with reference to FIG.
  • FIG. 2 shows an example of a cross section of fibers constituting the non-woven fabric layer (A) according to the laminated non-woven fabric of the present invention.
  • an image is taken of the cross section of the fibers constituting the non-woven fabric layer (A) at a magnification at which one single fiber can be observed with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • a line for example, L22
  • L22 a line that is parallel to the straight line (L21) and has only one intersection (V21) between the points S21 and 22 in the contour (C2) is drawn.
  • the distance b unit: ⁇ m
  • the percentage of the ratio of b to a (b / a ⁇ 100, the unit is%) was determined.
  • a simple number average of the results of performing the same operation on 20 different fibers is obtained, and the value rounded off to the second decimal place is the roval degree referred to in the present invention.
  • the degree of roval is more preferably 10.0% or more.
  • the degree of roval is more preferably 60% or less in order to suppress peeling of the convex portion due to friction during manufacturing and to obtain the laminated nonwoven fabric of the present invention with good quality. Even more preferably, the degree of roval is 10 to 60%.
  • the first thermoplastic resin fiber constituting the non-woven fabric layer (A) of the present invention has a plurality of convex portions in a cross section and has a roval degree of 5.0% or more in the cross section.
  • the fiber made of the first thermoplastic resin constituting the non-woven fabric layer (A) of the present invention is not limited in the shape of the convex portion and the number of convex portions per fiber.
  • the average single fiber diameter of the first thermoplastic resin fiber constituting the non-woven fabric layer (A) is 1.0 to 25.0 ⁇ m from the viewpoint of sufficiently exerting the moisture diffusion effect of the grooves on the side surface of the fiber in the direction of the non-woven fabric surface. Is preferable. Further, from the viewpoint that the water absorption performance due to the capillary effect can be improved by densifying the non-woven fabric layer, the average single fiber diameter of the first thermoplastic resin fiber is more preferably 20.0 ⁇ m or less. The average single fiber diameter of the first thermoplastic resin fiber constituting the non-woven fabric layer (A) is even more preferably 1.0 to 20.0 ⁇ m.
  • the average single fiber diameter is calculated as follows.
  • the area Af formed by the cross-sectional contour of the single fiber is measured using image analysis software (such as "WinROOF2015” manufactured by Mitani Shoji Co., Ltd.).
  • the diameter of a perfect circle having the same area as this area Af is calculated. This is measured for 20 single fibers arbitrarily extracted from the same non-woven fabric layer, a simple number average is obtained, the unit is ⁇ m, and the value rounded to the second decimal place is the average single fiber diameter referred to in the present invention. ..
  • Nonwoven fabric layer (B) made of second thermoplastic resin fiber The non-woven fabric layer (B) according to the laminated stretchable non-woven fabric of the present invention is composed of the above-mentioned thermoplastic resin fibers.
  • the thermoplastic resin fiber constituting the non-woven fabric layer (B) of the present invention may be either a single component fiber or a composite fiber.
  • the shape of the fiber cross section can be freely selected as long as the effect of the present invention is not impaired.
  • a preferred fiber cross-sectional shape is a round cross section.
  • the average single fiber diameter of the second thermoplastic resin fiber constituting the non-woven fabric layer (B) is preferably 3.0 to 30.0 ⁇ m. Further, when used as a sanitary material, the average single fiber diameter of the second thermoplastic resin fiber is more preferably 25.0 ⁇ m or less, still more preferably 3.0, from the viewpoint of improving the surface tactile sensation. It is ⁇ 25.0 ⁇ m.
  • the average single fiber diameter of the second thermoplastic resin fiber constituting the non-woven fabric layer (B) is relative to the average single fiber diameter Da of the first thermoplastic resin fiber constituting the non-woven fabric layer (A).
  • the ratio of Db (Db / Da, hereinafter, may be simply abbreviated as the average single fiber diameter ratio) is 1.0 or more.
  • An image is taken of the cross section of the fibers constituting the non-woven fabric layer (A) and the non-woven fabric layer (B) at a magnification at which one single fiber can be observed with a scanning electron microscope (SEM) to form the non-woven fabric layer (A).
  • the average single fiber diameter Da of the first thermoplastic resin fiber and the average single fiber diameter Db of the second thermoplastic resin fiber constituting the non-woven fabric layer (B) were measured.
  • the average single fiber diameter ratio is the average single fiber diameter Da of the first thermoplastic resin fiber constituting the non-woven fabric layer (A) and the average single fiber diameter of the second thermoplastic resin fiber constituting the non-woven fabric layer (B). It is the ratio of Db (Db / Da), which is the value rounded to the second digit of the decimal point.
  • the size of the voids woven by the fibers changes according to the average single fiber diameter of the constituent fibers. Therefore, when the non-woven fabric layers having different average single fiber diameters are stacked, the non-woven fabric layers having different interfiber void sizes are laminated, and when moisture adheres, they are composed of thick fibers due to the difference in capillary effect. Moisture absorbed in the non-woven fabric layer can be quickly transferred to the non-woven fabric layer made of fine fibers.
  • the average single fiber diameter ratio (Db / Da) is 1.0 or more, preferably 1.2 or more.
  • the laminated non-woven fabric of the present invention is a laminated non-woven fabric in which at least one layer each of the non-woven fabric layer (A) and the non-woven fabric layer (B) is laminated, and the non-woven fabric layer (B) is laminated on at least one outermost layer. Being done.
  • the non-woven fabric layer (B) By laminating the non-woven fabric layer (B) having a large average single fiber diameter and large interfiber voids in the non-woven fabric layer on the outermost layer, when moisture adheres to the non-woven fabric layer (B) side, the non-woven fabric layer is promptly applied. Since the moisture is transferred to (A), quick-drying can be obtained on the outermost surface on the non-woven fabric layer (B) side.
  • the laminated non-woven fabric of the present invention preferably has a water absorption rate of 20 seconds or less measured from at least one surface.
  • the water absorption rate is measured based on "7.1.1 Dropping method” of JIS L1907: 2010 "Water absorption test method for textile products”. One drop of water is dropped on the laminated non-woven fabric, the time until it is absorbed and the specular reflection on the surface disappears is measured, and the simple average of the values measured at 10 different points is calculated. The value rounded to the first decimal place is taken as the water absorption rate.
  • a water absorption rate of 20 seconds or less indicates that the performance of removing water adhering to the surface is good.
  • the water absorption rate is more preferably 10 seconds or less.
  • the basis weight of the laminated non-woven fabric of the present invention is preferably 10 to 100 g / m 2.
  • a laminated non-woven fabric having mechanical strength that can be put into practical use can be obtained.
  • the basis weight is preferably 100 g / m 2 or less, more preferably 50 g / m 2 or less, a laminated non-woven fabric having appropriate flexibility suitable for use as a non-woven fabric for sanitary materials. ..
  • the basis weight of the laminated nonwoven fabric of the present invention is preferably 13 to 50 g / m 2 .
  • the texture (g / m 2 ) of the laminated non-woven fabric is based on "6.2 Mass per unit area" of JIS L1913: 2010 "General non-woven fabric test method", and a test piece of 20 cm x 25 cm is used as a sample width of 3 per 1 m. Sheets are taken, each mass (g) in the standard state is weighed, and it refers to the mass per 1 m 2 calculated from the average value.
  • non-woven fabric layers (A) and the non-woven fabric layer (B) are integrated.
  • integrated means that these layers are joined by entanglement of fibers, fixation by a component such as an adhesive, and fusion of thermoplastic resins constituting each layer.
  • the laminated non-woven fabric of the present invention may be provided with a hydrophilic agent for the purpose of increasing water absorption.
  • the sanitary material of the present invention is composed of at least a part of the above-mentioned laminated non-woven fabric.
  • the sanitary material of the present invention has excellent water absorption and excellent quick-drying property.
  • the sanitary material of the present invention is mainly a disposable article used for health-related purposes such as medical treatment and long-term care.
  • Examples of the sanitary material of the present invention include paper diapers, sanitary napkins, gauze, bandages, masks, gloves, adhesive plasters, and the like, and include components thereof such as top sheets, back sheets, and side gathers of paper diapers. Among them, the following aspects are mentioned as preferable aspects.
  • the first preferred embodiment of the sanitary material of the present invention is a diaper in which the top sheet is made of the above-mentioned laminated non-woven fabric.
  • the laminated non-woven fabric is used so that the non-woven fabric layer (B) is installed on the skin surface side of the top sheet of the diaper, the excreted urine is quickly absorbed and the non-woven fabric layer (A) is quickly absorbed. Since the liquid is transferred, the surface of the laminated non-woven fabric can be kept dry.
  • a second preferred embodiment of the sanitary material of the present invention is a mask in which the inner surface layer is made of the above-mentioned laminated non-woven fabric.
  • the inner surface layer referred to in the present invention refers to the layer installed on the most oral side among the surface bodies covering the mouth.
  • the method for producing the nonwoven fabric layer (A) and the nonwoven fabric layer (B) constituting the laminated nonwoven fabric of the present invention can be selected from known manufacturing methods such as the spunbond method, the melt blow method, and the short fiber card method.
  • the spunbond method is cited as a preferable method because it has excellent productivity.
  • the spunbond method is a method in which a thermoplastic resin, which is a raw material, is melted, spun from a spinneret, and then cooled and solidified. The resulting yarn is pulled by an ejector, stretched, and collected on a moving net. This is a method for producing a non-woven fabric, which requires a step of heat-bonding after forming a non-woven fiber web.
  • various shapes such as a round shape and a rectangular shape can be adopted as the shape of the spinneret and the ejector used.
  • the shape of the fiber cross section can be controlled by changing the shape of the polymer discharge provided in the spinneret, it is preferable for the production of the non-woven fabric layer (A) in the laminated nonwoven fabric of the present invention.
  • the spinning temperature is preferably (melting temperature of the raw material thermoplastic resin + 10 ° C.) or more (melting temperature of the raw material thermoplastic resin + 100 ° C.) or less.
  • the spun yarn is then cooled.
  • the method of cooling the spun yarn include a method of forcibly blowing cold air on the yarn, a method of naturally cooling at the atmospheric temperature around the yarn, and a method of adjusting the distance between the spinneret and the ejector. Etc., or a method of combining these methods can be adopted. Further, the cooling conditions can be appropriately adjusted in consideration of the discharge amount per single hole of the spinneret, the spinning temperature, the atmospheric temperature and the like.
  • the cooled and solidified yarn is towed and stretched by the compressed air injected from the ejector.
  • the laminated non-woven fabric of the present invention it is important to control the average single fiber diameter of the fibers constituting the non-woven fabric layer (A) and the non-woven fabric layer (B).
  • the average single fiber diameter of the fiber is determined by the discharge amount and traction speed per discharge hole of the spinneret, that is, the spinning speed. Therefore, it is preferable to determine the discharge amount and the spinning speed according to the desired average single fiber diameter.
  • the spinning speed is preferably 2000 m / min or more, more preferably 3000 m / min or more. By setting the spinning speed to 2000 m / min or more, high productivity can be obtained, and the orientation and crystallization of the fibers proceed to obtain high-strength long fibers.
  • the long fiber yarns stretched by traction in this way are collected by a moving net to form a sheet, and then subjected to a process of heat bonding.
  • the laminated non-woven fabric of the present invention is a laminated non-woven fabric obtained by laminating at least one layer each of the non-woven fabric layer (A) and the non-woven fabric layer (B).
  • the non-woven fabric layer obtained by collecting the first thermoplastic resin fibers by the spunbond method on the collection net is first by the spunbond method.
  • the non-woven fabric obtained by collecting the second thermoplastic resin fiber by the spunbond method on the non-woven fabric layer obtained by collecting the first thermoplastic resin fiber on the collecting net by the spunbond method is preferable because it is excellent in productivity.
  • a heat embossed roll in which a pair of upper and lower roll surfaces are engraved (concavo-convex portions), a roll having a flat (smooth) one roll surface and the other.
  • a method of heat bonding with various rolls such as a thermal embossing roll consisting of a roll with engraving (unevenness) on the surface of the roll, and a thermal calendar roll consisting of a pair of upper and lower flat (smooth) rolls.
  • a method by thermocompression bonding such as ultrasonic bonding, in which heat welding is performed by ultrasonic vibration of the horn, can be adopted.
  • the laminated non-woven fabric of the present invention is produced by thermocompression bonding, it is preferable because the mechanical strength of the laminated non-woven fabric is increased by sufficiently adhering a plurality of non-woven fabric layers.
  • the laminated nonwoven fabric of the present invention is produced by this air-through method, it is preferable because it is bulky and has an excellent texture.
  • the non-woven fabric layer (B) is laminated on at least one surface layer, and any configuration can be adopted for the number and combination of the layers depending on the purpose.
  • the present invention will be described in detail based on Examples. However, the present invention is not limited to these examples.
  • the measurement is performed based on the above-mentioned method.
  • Non-woven fabric layer (A) Polypropylene (PP) was melted by an extruder and spun from a rectangular mouthpiece as a six-leaf cross-section fiber at a single-hole discharge rate of 0.56 g / min. After the spun yarn was cooled and solidified, it was towed and stretched by compressed air having a pressure at the ejector of 0.08 MPa in a rectangular ejector, and collected on a moving net to obtain a non-woven fiber web. ..
  • the characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (A) were that the average single fiber diameter was 15.5 ⁇ m and the roval degree was 8.8.
  • Non-woven fabric layer (B) Polypropylene (PP) was melted by an extruder and spun as a round cross-section fiber from a rectangular mouthpiece having a pore diameter of 0.4 mm at a single pore discharge rate of 0.90 g / min. After the spun yarn was cooled and solidified, it was towed and stretched by compressed air having a pressure at the ejector of 0.10 MPa in a rectangular ejector, and collected on a moving net to obtain a non-woven fiber web. .. The characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (B) were that the average single fiber diameter was 20.4 ⁇ m.
  • the laminated fiber web thus obtained is composed of a metal embossed roll in which regular circular protrusions are staggered in both directions of MD and CD on the upper roll and a metal flat roll on the lower roll.
  • heat bonding was performed at a linear pressure of 300 N / cm and a heat bonding temperature of 125 ° C. to obtain a laminated non-woven fabric having a grain size of 40 g / m 2.
  • the obtained laminated non-woven fabric was subjected to hydrophilic treatment, and then the average single fiber diameter ratio, water absorption rate, and water absorption and quick-drying property were evaluated. The results are shown in Table 1.
  • Example 2 A laminated non-woven fabric was obtained in the same manner as in Example 1 except that the fiber cross section of the non-woven fabric layer A was a trilobal cross section. Table 1 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 3 A laminated non-woven fabric was obtained in the same manner as in Example 1 except that the single-hole discharge rate was 0.65 g / min by the method for producing the non-woven fabric layer B. Table 1 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 4 The fibers of the non-woven fabric layer (A) were collected on a conveyor by the same method as in Example 1, and heat-bonded by the same method as in Example 1 to obtain the non-woven fabric layer (A). Similarly, for the non-woven fabric layer (B), the fibers of the non-woven fabric layer (B) are collected on the conveyor by the same method as in Example 1, and heat-bonded by the same method as in Example 1, and the non-woven fabric layer (B) is heat-bonded. ) was obtained.
  • the non-woven fabric layer (A) and the non-woven fabric layer (B) thus obtained are laminated (the laminating method is described as "offline” in Table 1), and the laminated non-woven fabric is heat-bonded in the same manner as in Example 1.
  • Got Table 1 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 5 The polymer used for the non-woven fabric layer (A) and the non-woven fabric layer (B) was polyethylene glycol copolymerized polyethylene terephthalate (copolymerized PET, the copolymerization rate of polyethylene glycol was 8% by mass of the polymer).
  • Non-woven fabric layer (A) A non-woven fiber web was obtained in the same manner as in Example 1 except that the polymer was copolymerized PET.
  • the characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (A) were that the average single fiber diameter was 12.5 ⁇ m and the degree of roval was 22.2.
  • Non-woven fabric layer (B) A non-woven fiber web was obtained in the same manner as in Example 1 except that the polymer was copolymerized PET.
  • the characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (B) were that the average single fiber diameter was 16.9 ⁇ m.
  • laminated non-woven fabric A laminated non-woven fabric was obtained in the same manner as in Example 1 except that the heat bonding temperature was set to 200 ° C. Table 2 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 6 The non-woven fabric layer (A) is collected on the non-woven fabric layer (C) described below by the same method as in Example 1, and the non-woven fabric layer (B) is further collected on the non-woven fabric layer (B) in the same manner as in Example 1.
  • a laminated non-woven fabric was obtained by heat-bonding by the method of (Table 2).
  • Table 2 shows the evaluation results of the obtained laminated non-woven fabric.
  • Non-woven fabric layer (C) Polypropylene (PP) was melted by an extruder and spun out as a round cross-section fiber from a rectangular mouthpiece having a pore diameter of 0.4 mm at a single pore discharge rate of 0.65 g / min. After the spun yarn was cooled and solidified, it was towed and stretched by compressed air having a pressure at the ejector of 0.10 MPa in a rectangular ejector, and collected on a moving net to obtain a non-woven fiber web. .. The characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (C) were that the average single fiber diameter was 16.0 ⁇ m.
  • Example 1 A laminated non-woven fabric was obtained in the same manner as in Example 1 except that the discharge hole shape of the base used in the non-woven fabric layer (A) was round. All the fibers of the non-woven fabric layer (A) had a round cross section, and the degree of roval could not be measured. Table 2 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 2 In the method for producing the nonwoven fabric layer (B), a laminated nonwoven fabric was obtained in the same manner as in Example 1 except that the single-hole discharge rate was 0.55 g / min and the pressure at the ejector was 0.08 MPa. The fibers of the non-woven fabric layer (B) had an average single fiber diameter of 15.0 ⁇ m. Table 2 shows the evaluation results of the obtained laminated non-woven fabric.
  • Example 3 A non-woven fiber web in which the non-woven fabric layer (A) is collected on the non-woven fabric layer (C) described below in the same manner as in Example 1 and the non-woven fabric layer (B) is collected on the non-woven fabric layer (B) is carried out.
  • a laminated non-woven fabric was obtained by heat-bonding in the same manner as in Example 1 (in Table 2, the laminated structure is described as "A / B / C").
  • Table 2 shows the evaluation results of the obtained laminated non-woven fabric.
  • Non-woven fabric layer (C) Polypropylene (PP) was melted by an extruder and spun out as a round cross-section fiber from a rectangular mouthpiece having a pore diameter of 0.4 mm at a single pore discharge rate of 0.55 g / min. After the spun yarn was cooled and solidified, it was towed and stretched by compressed air having a pressure at the ejector of 0.08 MPa in a rectangular ejector, and collected on a moving net to obtain a non-woven fiber web. .. The characteristics of the fibers constituting the obtained spunbonded non-woven fabric layer (C) were that the average single fiber diameter was 15.0 ⁇ m.
  • Examples 1 to 6 are excellent in water absorption and quick drying.
  • Example 1 Example 5, and Example 6, both the water absorption rate and the water absorption and quick-drying property were compatible at a high level.
  • Comparative Examples 1 to 3 the result was that the water absorption and quick-drying property were low.
  • the laminated non-woven fabric of the present invention has a sufficient water absorption rate for use as a non-woven fabric for protective materials, and also has water absorption and quick-drying properties.
  • a sanitary material having excellent water absorption and excellent quick-drying property can be obtained.
  • the laminated non-woven fabric of the present invention can be used as a part of sanitary materials such as disposable diapers, sanitary napkins, gauze, bandages, masks, gloves, and adhesive plasters.
  • C1 Cross-section contour L11: Straight line S11, S12 passing through two points (S11, S12) on the cross-section contour (C1) in the fiber cross-section: Point C2: Cross-section contour on the cross-section contour (C1) in the fiber cross-section L21: Straight line passing through two points (S21, S22) on the contour (C2) of the cross section in the fiber cross section L22: Parallel to the straight line (L21) and between points S21 and 22 of the contour (C2) Lines S21, S22, V21 having only one intersection (V21): Point a on the contour (C2) of the cross section in the fiber cross section: Distance b between points S21 and S22: Straight line (L21) and straight line (L22) Distance between

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