WO2019146726A1 - Non-tissé composite à fibres longues utilisant des fibres composites à gaine/âme excentriques au niveau d'une ou des deux surfaces - Google Patents

Non-tissé composite à fibres longues utilisant des fibres composites à gaine/âme excentriques au niveau d'une ou des deux surfaces Download PDF

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Publication number
WO2019146726A1
WO2019146726A1 PCT/JP2019/002363 JP2019002363W WO2019146726A1 WO 2019146726 A1 WO2019146726 A1 WO 2019146726A1 JP 2019002363 W JP2019002363 W JP 2019002363W WO 2019146726 A1 WO2019146726 A1 WO 2019146726A1
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WIPO (PCT)
Prior art keywords
woven fabric
composite
fiber non
fiber
melting point
Prior art date
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PCT/JP2019/002363
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English (en)
Japanese (ja)
Inventor
祥吾 池田
瑛大 藤井
一哉 税所
矢放　正広
早織 田中
Original Assignee
旭化成株式会社
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Application filed by 旭化成株式会社 filed Critical 旭化成株式会社
Priority to JP2019567166A priority Critical patent/JP6899453B2/ja
Priority to CN201980009708.4A priority patent/CN111630221B/zh
Publication of WO2019146726A1 publication Critical patent/WO2019146726A1/fr

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Classifications

    • 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
    • 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • 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
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D04H3/147—Composite yarns or filaments

Definitions

  • the present invention relates to a composite long-fiber non-woven fabric using at least one surface of an eccentric sheath-core type composite fiber composed of two or more types of thermoplastic resins, which has bulkiness and high strength with cushioning softness suitable for sanitary materials
  • the present invention also relates to a composite long-fiber non-woven fabric having excellent surface properties required for sanitary materials such as surface smoothness and fuzz resistance.
  • the spread of disposable diapers has been remarkable, and the required quality and performance have been improved.
  • the performance required for the top sheet and the back sheet in the diaper construction is soft, and in particular, the diaper for adults may be accompanied by nursing care, and thus high strength and elongation are required.
  • staple fibers are often used, and an air through method of bonding staple fiber webs by a card method or air lay method by hot air is performed, and cushioning bulkiness Has a softness with.
  • the bonding temperature should be raised as a means to improve the strength and the elongation. It was necessary and the texture was hard.
  • long fibers by the spun bond method are also used for the top sheet and back sheet, but with the spun bond, high tenacity non-woven fabrics are obtained from the production method, but the fibers are arranged in the surface direction and the fibers occupying the thickness direction are It was difficult to obtain a small amount of bulkiness. That is, in the conventional long-fiber non-woven fabric, there is a problem that it is very difficult to achieve both bulkiness having cushioning softness and high strength and elongation.
  • Patent Document 1 discloses a non-woven fabric with eccentric sheath core type fibers, but the sheath core is a perfect circle shape, there is no description of the detailed design regarding the shape of the sheath component, and the number of crimped fibers is There is little and bulkiness is inferior.
  • Patent Document 2 discloses a fiber spherical body using an eccentric sheath core type fiber as a material suitable for filling of a cushion or a down jacket, a sheet suitable for a top sheet or a back sheet of a sanitary material It is not suitable for formation.
  • the problem to be solved by the present invention is to have both bulkiness and high strength having cushioning softness suitable for the top sheet and back sheet portion of the absorbent article used for sanitary materials It is an object of the present invention to provide a processable excellent long-fiber non-woven fabric having surface characteristics that can be suitably used for sanitary materials.
  • the present inventors diligently studied to solve the above problems, and as a result of repeating experiments, the temperature from the extruder to the spinneret regarding the low melting point component constituting the sheath and the high melting point component resin constituting the core And adjusting the residence time of the resin in the spinneret, controlling the viscosity difference of the resin in the spinneret, and designing the distribution of the resin in the spinneret to obtain a highly eccentric fiber. It was possible.
  • the highly eccentric fiber thus obtained was discharged from the spinneret by setting the core to an elliptical shape and controlling the film thickness to an appropriate range, with the sheath covering 100% of the fiber outer circumference.
  • the internal stress applied to the sheath in the fiber acts so as to cover the core from the periphery, and the crimp also occurs in long fibers having a fiber shape in which the sheath covers 100% of the core. It became possible to increase the number. As the number of crimps increases, the overlapping of the yarns increases in the thickness direction of the non-woven fabric, and the fibers are adhered while maintaining the overlapping of the yarns, and furthermore, the yarn surface is covered with the 100% low melting point component. The bonding frequency is increased, and the fabric strength can be increased even with a low heat amount, and high strength, bulkiness and fuzz resistance can be obtained.
  • the sheath portion has a fiber structure covering 100% of the fiber surface, and the fiber cross section does not appear on the non-woven fabric surface because it is composed of long fibers, and the friction resistance is small. It has been found that the skin feels smooth and can be suitably used for hygiene applications.
  • a portion with a thickness of 100 to 500 nm of the sheath covering the core occupies 30 to 60% of the entire surface of the fiber, and the thickness of the thickest portion of the sheath is 25% or more of the fiber radius.
  • the composite continuous fiber non-woven fabric according to the present invention is a composite continuous fiber non-woven fabric using at least one surface of an eccentric sheath-core type composite fiber composed of components utilizing two or more types of melting point differences. Since it is a non-woven fabric having excellent bulkiness and surface characteristics and high processing strength, it can be suitably used as a top sheet and a back sheet in hygiene material applications.
  • the composite continuous fiber non-woven fabric of the present embodiment is a composite continuous fiber non-woven fabric using at least one surface of an eccentric sheath-core type long fiber non-woven fabric composed of eccentric sheath-core type composite fibers containing two or more thermoplastic resins.
  • the eccentric sheath-core type composite fiber has a cross section of a true circle shape, is constituted by a core portion of an elliptical high melting point component and a sheath portion which is a low melting point component, and the fiber surface is a low melting point component.
  • the eccentric sheath core type long fiber constituting the eccentric sheath core type long fiber nonwoven fabric is made of a combination of two or more kinds of thermoplastic resins.
  • the thermoplastic resin include polyolefin resins such as polyethylene, polypropylene and copolymerized polypropylene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and copolymer polyester, nylon-6, nylon-66, co-polymer Polyamide-based resins such as polymerized nylon, biodegradable resins such as polylactic acid, polybutylene succinate, and polyethylene succinate are used.
  • thermoplastic resins Any combination of the above-mentioned thermoplastic resins is possible as long as the desired effect is not impaired, and a combination of thermoplastic resins having a melting point difference is preferable in terms of bonding of the fibers.
  • a combination of thermoplastic resins having a melting point difference is preferable in terms of bonding of the fibers.
  • polyolefin resins For example, composite fibers combined from resins such as polyethylene, polypropylene and copolymers of those monomers with other ⁇ -olefins can be mentioned.
  • Other ⁇ -olefins are those having 3 to 10 carbon atoms, and specific examples thereof include propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, 1-octene and the like Be
  • the fiber shape of the eccentric sheath core type long fiber constituting the eccentric sheath core type long fiber nonwoven fabric is literally an eccentric sheath core type, crimped yarn can be easily obtained.
  • the core is elliptical and forms a thin film in the range of 30 to 60% of the surface layer of the fiber, the thin film has a thickness of 100 nm to 500 nm, and the thickest part of the sheath is 25% or more of the fiber radius By forming the occupied film, fibers having high eccentricity can be obtained.
  • the thickness of the sheath thin film is 100 nm to 500 nm, preferably 100 nm to 400 nm, and more preferably 100 nm to 300 nm.
  • the ratio of the thin film to the surface layer of the fiber is 30 to 60%, more preferably 30 to 50%, and still more preferably 30 to 40%.
  • the thickest part of the sheath part is 25% or more, preferably 30% or more, more preferably 35% or more of the fiber radius.
  • the core part is 100% covered with the sheath part, which results from the adhesion between the sheath parts, and high strength and fluff suppression can be obtained.
  • the cross-sectional shape of the eccentric sheath core long fiber constituting the eccentric sheath core long fiber non-woven fabric is a true circle shape.
  • the term "perfect circular shape” means that the ratio of the length of the longest diameter of the fiber cross section to the length of the shortest diameter is 0.8 to 1.0, preferably It is 0.9 to 1.0, more preferably 0.95 to 1.0. If the fiber cross section has a perfect circular shape, stable spinning is possible, and furthermore, it is possible to obtain a non-woven fabric having a good feeling that does not feel trapped when touching the fiber.
  • the sheath portion does not cover the entire circumference of the fiber, or the eccentricity is low and the number of crimps is small.
  • An appropriate range of the viscosity characteristic difference (MFR / MI ratio) of the high melting point component and the low melting point component is 1.0 or more and 3.5 or less as a value obtained by dividing the MFR of the high melting point component by the MI of the low melting point component. Is preferred.
  • the core By setting the MFR / MI ratio to 1.0 or more, the core can be formed into an elliptical shape, and as the MFR / MI ratio is larger, the viscosity difference becomes larger and the eccentricity becomes higher.
  • the lower limit value is more preferably 1.7 or more, still more preferably 2.0 or more, and most preferably 2.1 or more because the property is obtained.
  • the sheath can cover the entire circumference of the fiber, so 3.5 or less is preferable from the viewpoint of the adhesion between the fibers.
  • the high melting point component is polypropylene and the low melting point component is polyethylene.
  • the weight ratio of the high melting point component to the whole fiber is preferably 50 to 80%, more preferably 60 to 70%, and still more preferably 65 to 70%.
  • polypropylene as the high melting point component, it is high in strength and difficult to be broken at the time of use, and is excellent in dimensional stability at the time of production of the sanitary material.
  • polyethylene as the low melting point component, the sheath part is attributable to adhesion, so that high strength and fluff suppression can be obtained.
  • the high melting point component polypropylene in the case of forming with the above two types of thermoplastic resins may be a polymer synthesized by a general Ziegler Natta catalyst, or a polymer synthesized by a single site active catalyst represented by a metallocene, etc. Also, ethylene random copolymer polypropylene may be used. These may be used alone or in combination of two or more. In particular, homopolypropylene is preferred as the main component in terms of texture, strength and dimensional stability.
  • the lower limit of the MFR of polypropylene is preferably 20 g / 10 min or more, more preferably 30 g / 10 min or more, still more preferably 40 g / 10 min or more, and most preferably 53 g / 10 min or more.
  • the upper limit of the MFR of polypropylene is preferably 85 g / 10 min or less, more preferably 70 g / 10 min or less, and still more preferably 60 g / 10 min or less.
  • MFR was measured according to JIS-K7210 “Test method of melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastic-thermoplastics”, test temperature 230 ° C., test load 2.16 kg. .
  • polyethylene resin of the low melting point component in the case of forming with the two types of thermoplastic resins can be suitably used as a hygienic material from the viewpoint that the adhesive strength after bonding of the fibers is strong and the texture as a non-woven fabric is good.
  • polyethylene may be a polymer synthesized by a general Ziegler-Natta catalyst, or a polymer synthesized by a single site activated catalyst represented by a metallocene.
  • high density polyethylene, linear low density polyethylene, low density polyethylene can be used, and the density is preferably 0.90 to 0.97 g / cm 3 , more preferably 0.91 to It is 0.96 g / cm 3 .
  • the lower limit of MI of polyethylene is preferably 10 g / 10 min or more, more preferably 15 g / 10 min or more.
  • the upper limit of MI of polyethylene is preferably 50 g / 10 min or less, more preferably 45 g / 10 min or less.
  • MI was measured according to JIS-K7210 “Test method of melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastic-thermoplastics”, test temperature 190 ° C., test load 2.16 kg. .
  • the spinning temperature is preferably 200 ° C. or more and 260 ° C. or less, more preferably 230 ° C. or more and 250 ° C. to obtain a desired fiber cross-sectional shape. It is less than ° C.
  • the temperature is less than 200 ° C., the viscosity of both polypropylene and polyethylene becomes high, and the difference in viscosity becomes small, so a desired fiber shape can not be obtained. If the temperature exceeds 260 ° C., the flowability of the polyethylene which is the sheath becomes high, and after it is discharged from the spinning nozzle, the thickness of the sheath becomes large and the desired fiber shape can not be obtained.
  • the eccentric sheath core type long fibers constituting the eccentric sheath core type long fiber non-woven fabric preferably have a helical crimp in order to maintain the texture and bulkiness of the non-woven fabric.
  • the number of crimps of the fiber is preferably 5 to 45 / inch, and more preferably 10 to 40 / inch. If the number of crimps is less than 5 pieces / inch, the bulk of the obtained nonwoven fabric is insufficient, while if it exceeds 45 pieces / inch, the appearance of the obtained nonwoven fabric is impaired due to the uneven fiber dispersion of the obtained nonwoven fabric.
  • the eccentric sheath-cored long-fiber non-woven fabric is preferably a composite long-fiber non-woven web formed by a spunbond method from the viewpoint of strength and productivity.
  • Such composite long fibers are produced, for example, by melt extruding different thermoplastic resins from two or more different extruders, and as a yarn in a state in which two or more types of thermoplastic resins are compounded from a spinneret having a large number of spinning holes. It is discharged. Next, cold air controlled at 5 ° C. to 20 ° C. is applied to the discharged yarn, and it is pulled while being cooled. The yarn exiting from the pulling device is deposited on a conveyer and conveyed as a nonwoven web. The nonwoven web being transported may be laminated to form a multilayer laminated nonwoven web.
  • a joining means in the case of joining the nonwoven web comprised with a thermoplastic conjugate fiber and making it into a nonwoven fabric, it will not be limited especially if it is a method of heating more than the temperature which the intersection of fibers melts and adheres .
  • a heating method various heating methods such as a hot air circulation type, a hot air penetration type, an infrared heater type, a method of blowing hot air to both surfaces of a non-woven fabric, a method of introducing into a heating gas, and the like are used. From the viewpoint of obtaining more fiber bonding points at the intersections of the fibers and increasing the breaking strength of the non-woven fabric, heating with hot air is preferable, and in particular, a hot air penetrating type is preferable.
  • the temperature of the hot air is preferably adjusted to a temperature suitable for the thermoplastic resin having a low melting point and contributing to bonding. As the production speed increases, it is necessary to raise the temperature to secure the amount of heat that contributes to adhesion, and the appropriate temperature is adjusted according to the production conditions.
  • the thermoplastic resin is polyethylene
  • polyethylene is The temperature is 125 to 155 ° C., preferably 130 to 155 ° C., more preferably 135 ° C. to 150 ° C. for melting and bonding. If the bonding temperature is in this range, bonding of the fibers is developed at the intersection of the fibers without impairing the texture, and it becomes possible to develop the strength as a non-woven fabric.
  • the velocity of the hot air is preferably 0.5 m / sec to 3.0 m / sec, more preferably 0.7 m / sec to 2.5 m / sec, still more preferably 0.7 m / sec to 2.0 m / sec It is. If the wind speed of the hot air is in this range, adhesion of the fibers is developed at the intersection of the fibers without impairing the texture, and the strength as the non-woven fabric can be developed.
  • the non-woven web before bonding or after bonding of the non-woven fabric may be subjected to heat bonding by embossing. It is preferable from the viewpoint of productivity to process embossing through a pair of rolls of a combination of a metal embossing roll and a metal flat roll.
  • the embossed area ratio is preferably 5 to 30%, more preferably 5 to 20%, and still more preferably 6 to 15%, from the viewpoint of shape retention of the nonwoven web and the strength of the finally obtained nonwoven fabric.
  • the deeper the emboss depth the softer the non-woven fabric can be obtained, preferably 0.5 to 2.0 mm, more preferably 0.7 to 1.5 mm.
  • the emboss shape is not particularly limited, but is preferably circular, oval, diamond, or rectangular, in order to obtain a non-woven fabric having softness and appropriate strength and elongation suitable for use in sanitary materials. Can be selected as appropriate.
  • the composite continuous fiber non-woven fabric of the present embodiment may be obtained by laminating the eccentric sheath-core long-fiber non-woven fabric with a side-by-side long-fiber non-woven fabric and / or an eccentric sheath-core long-fiber non-woven fabric.
  • the side-by-side type long fiber non-woven fabric has high crimpability of fibers by separating the center of gravity position of the two components and can obtain non-woven fabric with high bulkiness, but the ratio of the fiber surface of low melting point component decreases. Fuzziness and strength may be reduced.
  • the composite continuous fiber nonwoven fabric of the present embodiment uses the nonwoven fabric as a sanitary material and the surface in contact with the skin is the surface layer
  • using the eccentric sheath core type composite long fiber as the surface layer impairs the texture. Absent.
  • an eccentric sheath-core type composite long fiber non-woven fabric having a structure difference in which the number of crimps and the fineness, and the weight ratio of the high melting point and the low melting point component are different may be laminated on the eccentric sheath-core type composite long fiber non-woven fabric.
  • the average single fiber fineness of the eccentric sheath-core type composite long fiber is preferably 1.0 dtex or more and 3.5 dtex or less, more preferably 1.2 dtex or more and 3.3 dtex or less, still more preferably 1.5 dtex or more and 3.0 dtex or less It is. From the viewpoint of spinning stability, the average single yarn fineness is preferably 1.0 dtex or more, and from the viewpoint of the feel of the non-woven fabric used for sanitary materials, it is preferably 3.5 dtex or less.
  • Basis weight of the composite long fiber nonwoven fabric of the present embodiment is preferably 10 g / m 2 or more 50 g / m 2 or less, more preferably 10 g / m 2 or more 40 g / m 2 or less, more preferably 12 g / m 2 or more 30 g / m 2 or less. If the weight per unit area is 10 g / m 2 or more, the nonwoven fabric used for the sanitary material satisfies the strength, while if 50 g / m 2 or less, the softness of the nonwoven fabric used for the sanitary material is satisfied, Do not give a thick impression.
  • a long fiber non-woven fabric having an average fiber diameter of 0.5 ⁇ m to 3.0 ⁇ m may be laminated on the eccentric sheath-core type composite long fiber non-woven fabric.
  • the coverage of the non-woven fabric can be improved, the dispersion unevenness of appearance is improved, and the hot melt agent escapes when used for sanitary materials Or, it can be suitably used to suppress the loss of a highly absorbent resin (SAP) when used as a top sheet.
  • SAP highly absorbent resin
  • the range of the fiber diameter is preferably 0.5 ⁇ m to 3.0 ⁇ m, more preferably 0.7 ⁇ m to 2.5 ⁇ m, and still more preferably 1.0 ⁇ m to 2.3 ⁇ m.
  • the bulk density of the composite continuous fiber non-woven fabric of the present embodiment is preferably in the range of 0.01 g / cm 3 to 0.07 g / cm 3 .
  • the bulk density is preferably 0.01 g / cm 3 or more from the viewpoint of strength, and is preferably 0.07 g / cm 3 or less from the viewpoint of texture.
  • the breaking strength of the composite continuous fiber non-woven fabric of the present embodiment is preferably 25 N / 5 cm to 60 N / 5 cm, more preferably 30 N / 5 cm to 50 N / 5 cm, and still more preferably 35 N / 5 cm to 45 N / 5 cm. is there.
  • the breaking strength is 25 N / 5 cm or more, when used for sanitary materials, it does not stretch or break when it is put on at the time of wearing, and if it is 60 N / 5 cm or less, the texture is soft and it is used for sanitary materials It can be used suitably.
  • the heat seal strength of the composite long fiber non-woven fabric of the present embodiment is preferably in the range of 3N / 5 cm to 15 N / 5 cm, more preferably 5 N / 5 cm to 12 N / 5 cm, still more preferably 7 N / 5 cm to 10 N / 5 cm. . If the heat seal strength is 3 N / 5 cm or more, the heat seal portion can be used without peeling or tearing when used as a sanitary material application, and if 15 N / 5 cm or less, the heat seal portion is over-welded. It does not form a film, has a soft texture, and can be suitably used for sanitary materials.
  • the mean deviation (SMD) of the surface roughness of the surface of the eccentric sheath core type long fiber non-woven fabric side of the composite long fiber non-woven fabric of this embodiment is preferably 1.0 ⁇ m or more and 2.4 ⁇ m or less, and 1.4 ⁇ m or more and 2.2 ⁇ m or less More preferably, it is more preferably 1.6 ⁇ m or more and 2.0 or less.
  • SMD mean deviation
  • the fluff grade of the surface on the eccentric sheath core type long fiber non-woven fabric side of the composite long fiber non-woven fabric of the present embodiment is preferably 3 or more, more preferably 4 or more, and still more preferably 5 or more. If the fluff grade is grade 3 or higher, the fiber-bonded portion of the non-woven fabric surface is not easily peeled off even when rubbed with the skin, fluffing of the fiber surface is suppressed, and sticking to the skin and fingertips can be reduced. It can be obtained and can be suitably used in a guarding material application.
  • the composite long-fiber non-woven fabric of the present embodiment may contain a hydrophilizing agent.
  • a hydrophilizing agent to be used, in consideration of safety to the human body, safety in the process, etc., nonionic surfactants added with ethylene oxide such as higher alcohols, higher fatty acids, alkylphenols, alkyl phosphate salts And anionic surfactants such as alkyl sulfates, etc., which may be used alone or as a mixture.
  • an existing method such as a dipping method, a spraying method, a coating (kiss coater, gravure coater) method or the like can be usually employed using a diluted hydrophilizing agent, and hydrophilicity mixed in advance if necessary
  • the agent is diluted with a solvent such as water and then applied.
  • a drying step may be required.
  • a drying method in that case, a known method using convection heat transfer, conduction heat transfer, radiation heat transfer, etc. can be adopted, and drying by hot air or infrared rays, a drying method by thermal contact, etc. can be used.
  • the adhesion amount of the hydrophilizing agent varies depending on the required performance, it is usually preferably in the range of 0.05% by weight or more and 1.00% by weight or less, more preferably 0.15% by weight or more based on the fiber. .8% by weight or less, more preferably 0.2% by weight or more and 0.6% by weight or less.
  • the adhesion amount is in this range, the hydrophilic performance as a top sheet of the sanitary material is satisfied, and the processing suitability is also good.
  • the composite long-fiber non-woven fabric of the present embodiment can be suitably used for the production of a sanitary material because it has a bulkiness having a cushioning softness and a high strength and elongation.
  • Hygiene materials include disposable diapers, sanitary napkins, incontinence pads and the like, and the composite long-fiber non-woven fabric of the present embodiment can be suitably used particularly for the top sheet on the surface and the back sheet on the outside.
  • applications of the composite long fiber non-woven fabric of the present embodiment are not limited to the above applications, and, for example, masks, cairos, tape bases, waterproof sheet bases, patched medicine bases, first aid base, packaging materials, wipes It may be used for products, medical gowns, bandages, clothing, skin care sheets and the like.
  • the present invention will be specifically described by way of examples and comparative examples, but the present invention is not limited to only the following examples.
  • the temperature in the bonding step, the hot wind speed and the like are appropriately changed depending on the weight of the fabric to be produced and the line speed.
  • the evaluation method of each characteristic is as follows, and the obtained physical property etc. are shown to the following Tables 1 and 2.
  • MD direction production line direction of fibers
  • CD direction width direction orthogonal to the flow direction of fibers
  • Basis weight (g / m 2 ) According to JIS-L 1906, five test pieces of 20 cm in the MD direction and 5 cm in the CD direction were arbitrarily collected to measure the mass, and the average value was converted into the weight per unit area.
  • Breaking strength (N / 5 cm) According to JIS L-1906, except for 10 cm on both ends of manufactured non-woven fabric, 5 samples of 5 cm in CD direction and 20 cm in MD direction are cut out so as to be uniform in CD direction, grip distance 10 cm, tensile speed with tensile tester It measured at 30 cm / min. The samples at five points in the MD direction were measured, and the measured values were averaged to calculate the breaking strength.
  • the test piece of 5 mm in the CD direction and 20 mm in the MD direction was sampled by dividing into approximately 5 equal parts in the CD direction except 10 cm of both ends of the manufactured non-woven fabric, and fibers were cut perpendicular to the fiber length direction.
  • Heat seal strength (N / 5 cm) A sample of 3 cm in the CD direction and 20 cm in the MD direction is cut out so as to be uniform in the CD direction except 10 cm at both ends of the manufactured nonwoven fabric, and folded so as to overlap both ends of the nonwoven fabric. The creased end was pressed for 1 second with a force of 70 N / 1 cm with a 3 cm ⁇ 10 cm hot plate heated at 125 ° C. for bonding. The breaking strength was calculated by averaging measured values of samples at five points in the MD direction with a tension tester at a grip distance of 10 cm and a tensile speed of 30 cm / min so as to split the non-bonded end up and down. .
  • SMD surface roughness
  • Fuzz grade (class) Take a 25 mm x 300 mm test piece in the CD direction, use the Japan Society for the Promotion of Science Fastness Tester, load the friction element 150 g, use the same cloth on the friction element side, and operate 100 times, It was judged by the following evaluation criteria: 5.0 grade: no fuzz grade 4.0: about 1 or 2 fibers, or a small floss at a single location, fuzziness grade 3.0: a clear floss begins to be produced, Or, a plurality of small pill is observed. Grade 2.0: The thinner the specimen, the more the fibers are peeled off. Grade 1.0: The larger the breakage of the specimen, the fibers are scraped off.
  • Example 1 A polypropylene (hereinafter also referred to as PP) resin with an MFR of 55 g / 10 min (measured according to JIS-K 7210 at a temperature of 230 ° C. and a load of 2.16 kg) as the high melting point component, and an MI of 26 g / 10 min (JIS-K A high-density polyethylene (hereinafter also referred to as HDPE) resin with a temperature of 190 ° C and a load of 2.16 kg according to K7210 as the low melting point component, and the ratio of the high melting point component to the low melting point component is 67/33. Were extruded at a spinning temperature of 230 ° C.
  • PP polypropylene
  • HDPE high-density polyethylene
  • Example 2 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1, except that the ratio of the high melting point component to the low melting point component was 75/25.
  • Example 3 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that the ratio of the high melting point component to the low melting point component was 80/20.
  • Example 4 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that the HDPE resin having a MI of 23 g / 10 min was used as the low melting point component.
  • Example 5 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that a PP resin having a MFR of 40 g / 10 min was used as the high melting point component and an HDPE resin having an MI of 19 g / 10 min was used as the low melting point component.
  • Example 6 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that a PP resin having MFR of 33 g / 10 min was used as the high melting point component and an HDPE resin having MI of 19 g / 10 min was used as the low melting point component.
  • Example 7 Example 1 and Example 1 except that the PP resin having MFR of 33 g / 10 min. Is a high melting point component and the linear low density polyethylene (hereinafter referred to as LLDPE) resin having an MI of 17 g / 10 min. In the same manner, a composite long fiber non-woven fabric was obtained.
  • the PP resin having MFR of 33 g / 10 min. Is a high melting point component and the linear low density polyethylene (hereinafter referred to as LLDPE) resin having an MI of 17 g / 10 min.
  • LLDPE linear low density polyethylene
  • Example 8 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that LLDPE resin having a MI of 17 g / 10 min was used as the low melting point component.
  • Example 9 A composite long-fiber non-woven fabric in the same manner as in Example 1 except that the PP resin having MFR of 33 g / 10 min is used as the high melting point component and the low density polyethylene (LDPE) resin having MI of 31 g / 10 min is used as the low melting point component. I got
  • Example 10 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that the LDPE resin having a MI of 31 g / 10 min was used as the low melting point component.
  • Example 11 The composite long fiber non-woven fabric of the same condition was further laminated on the composite long fiber non-woven fabric obtained in Example 1, and the line speed was adjusted so that the fabric weight was 25 g / m 2 to obtain a composite long fiber non-woven fabric.
  • Example 12 A side-by-side type composite long fiber having a MFR of 55 g / 10 min as a PP resin as a high melting point component, an MI of 26 g / 10 min as a low melting point component, and a 50/50 ratio of a high melting point component to a low melting point component
  • the composite long fiber nonwoven fabric prepared by the same method as in Example 1 was laminated on the composite long fiber nonwoven fabric obtained in Example 1, and the line speed was adjusted to obtain a composite long fiber nonwoven fabric with a fabric weight of 25 g / m 2 .
  • Example 13 A single-component PP resin with an MFR of 1000 g / 10 min is extruded at a spinning temperature of 220 ° C. by a meltblown method at a single hole discharge rate of 0.1 g / m 2 , and this filament group is pulled at an HA temperature of 300 ° C.
  • a web adjusted to a diameter of 2.0 ⁇ m is sprayed onto the eccentric sheath-cored long-fiber non-woven web obtained in Example 1 and laminated, and the eccentric sheath-cored long-fiber non-woven fabric obtained in Example 1 on this laminated web The web was laminated and the line speed was adjusted to obtain a composite long fiber non-woven fabric having a basis weight of 15 g / m 2 .
  • Example 14 The eccentric sheath core type long fiber nonwoven fabric obtained in the same manner as in Example 1 is laminated on the laminate of the eccentric sheath core type long fiber nonwoven fabric obtained in Example 12 and the side-by-side type composite long fiber nonwoven fabric, and the line speed is adjusted.
  • the composite long fiber nonwoven fabric of 20 g / m 2 in basis weight was obtained.
  • Example 15 A laminate of the eccentric sheath core long fiber nonwoven web and the side-by-side long fiber nonwoven web obtained in Example 12 is laminated on the eccentric sheath core long fiber nonwoven web obtained in Example 1, and the line speed is It adjusted and obtained the composite long fiber nonwoven fabric of 20 g / m ⁇ 2 > of fabric weight.
  • Example 16 An eccentric sheath-cored long-fiber non-woven web is prepared in the same manner as in Example 1, and then the obtained non-woven fabric is applied with a polyether hydrophilizing agent by a spraying method, and then heated at 120 ° C for 1.0 seconds. It dried and obtained the composite long-fiber nonwoven fabric used as the agent concentration adhesion amount 0.5 weight%. The obtained non-woven fabric was a non-woven fabric of the same performance as Example 1 with satisfactory performance as a top sheet of a diaper.
  • Example 17 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 16, except that the amount of the agent concentration of the polyether-based hydrophilizing agent was 0.25% by weight. The obtained non-woven fabric had satisfactory performance as a diaper top sheet, and was a non-woven fabric of the same performance as Example 1.
  • Comparative Example 1 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that the HDPE resin having a MI of 70 g / 10 min was used as the low melting point component.
  • Comparative Example 2 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that a PP resin having a MFR of 29 g / 10 min was used as the high melting point component and an HDPE resin having an MI of 32 g / 10 min was used as the low melting point component.
  • Comparative Example 3 A composite long-fiber non-woven fabric was obtained in the same manner as in Example 1 except that L LDPE resin having a MI of 120 g / 10 min was used as the low melting point component.
  • Comparative Example 4 A composite long fiber non-woven fabric was obtained in the same manner as Example 1, except that the ratio of the high melting point component to the low melting point component was 90/10.
  • Comparative Example 5 A composite long-fiber non-woven fabric was obtained in the same manner as Example 1, except that the ratio of the high melting point component to the low melting point component was 20/80.
  • Comparative Example 6 Composite long fiber in the same manner as Example 1, except that the HDPE resin having a MI of 32 g / 10 min is used as the low melting point component and the ratio of the high melting point component to the low melting point component is 50/50. I got a non-woven fabric.
  • Comparative Example 7 A composite long-fiber non-woven fabric was obtained in the same manner as in Comparative Example 6 except that the low melting point component MI was 48 g / 10 min.
  • Comparative Example 8 The composite length is the same as in Example 1, except that the low melting point component MI is 48 g / 10 min HDPE resin and the ratio of the high melting point component to the low melting point component is 67/33. A fiber non-woven fabric was obtained.
  • Comparative Example 9 Except that the eccentric sheath core type composite long fiber non-woven fabric obtained in Example 1 was laminated on the side-by-side type composite long fiber non-woven fabric obtained in Comparative Example 7 and further the side-by-side type composite long fiber non-woven fabric obtained in Comparative Example 7 was laminated. The line speed was adjusted in the same manner as in Example 1 to obtain a composite long-fiber non-woven fabric having a basis weight of 25 g / m 2 .
  • the composite continuous fiber non-woven fabric according to the present invention is a composite continuous fiber non-woven fabric using at least one surface of an eccentric sheath-core type composite fiber composed of components utilizing two or more types of melting point differences. Since it is a non-woven fabric having excellent bulkiness and surface characteristics and high processing strength, it can be suitably used as a top sheet and a back sheet in hygiene material applications.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dermatology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un non-tissé à fibres longues qui : est approprié comme couche supérieure ou couche inférieure d'un article absorbant utilisable dans un matériau sanitaire; offre à la fois une résistance élevée et un volume assurant une souplesse d'amortissement; présente des caractéristiques de surface utilisables de manière appropriée dans des matériaux sanitaires; et présente une excellente aptitude au traitement. L'invention concerne un non-tissé composite à fibres longues qui utilise, au niveau d'une ou des deux surfaces, un non-tissé à fibres longues à gaine/âme excentriques comprenant des fibres composites à gaine/âme excentriques comportant au moins deux types de résine thermoplastique. Le non tissé composite à fibres longues se caractérise en ce que les fibres composites à gaine/âme excentriques présentent des sections transversales parfaitement circulaires et sont conçues à partir d'une partie âme elliptique de composant à point de fusion élevé et d'une partie gaine de composant à bas point de fusion, en ce que la surface des fibres est recouverte à 100% des parties gaine de composant à bas point de fusion, en ce que les parties gaine recouvrant les parties âme présentent une épaisseur de 100 à 500 nm sur 30 à 60% de la surface des fibres, et en ce que la partie la plus épaisse des parties gaine représente au moins 25% du rayon des fibres. L'invention concerne également un matériau sanitaire utilisant le non tissé composite à fibres longues.
PCT/JP2019/002363 2018-01-24 2019-01-24 Non-tissé composite à fibres longues utilisant des fibres composites à gaine/âme excentriques au niveau d'une ou des deux surfaces WO2019146726A1 (fr)

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JP2019567166A JP6899453B2 (ja) 2018-01-24 2019-01-24 偏心鞘芯型複合繊維を少なくとも片方の面に用いた複合長繊維不織布
CN201980009708.4A CN111630221B (zh) 2018-01-24 2019-01-24 至少单面使用了偏心鞘芯型复合纤维的复合长纤维无纺布

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WO2021256146A1 (fr) * 2020-06-15 2021-12-23 東レ株式会社 Tissu non tissé par filage direct et matériau sanitaire

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