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WO2017145993A1 - Non-tissé à fibres longues à sensation tactile supérieure - Google Patents

Non-tissé à fibres longues à sensation tactile supérieure Download PDF

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Publication number
WO2017145993A1
WO2017145993A1 PCT/JP2017/006165 JP2017006165W WO2017145993A1 WO 2017145993 A1 WO2017145993 A1 WO 2017145993A1 JP 2017006165 W JP2017006165 W JP 2017006165W WO 2017145993 A1 WO2017145993 A1 WO 2017145993A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
less
fiber
skin
friction
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/JP2017/006165
Other languages
English (en)
Japanese (ja)
Inventor
登志子 中東
一哉 税所
矢放　正広
一史 加藤
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.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
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.)
Filing date
Publication date
Application filed by Asahi Kasei Corp, Asahi Chemical Industry Co Ltd filed Critical Asahi Kasei Corp
Priority to CN201780011534.6A priority Critical patent/CN108699745B/zh
Priority to JP2018501672A priority patent/JP6542974B2/ja
Priority to MYPI2018702596A priority patent/MY184560A/en
Publication of WO2017145993A1 publication Critical patent/WO2017145993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • A61F13/514—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
    • 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 partially thermocompression-bonded nonwoven fabric of composite long fibers made of two or more kinds of thermoplastic resins having good touch, little physical irritation to the skin, and bulky.
  • the materials used for the parts that come into contact with the skin such as top sheets for sanitary materials such as disposable diapers and sanitary napkins, have a soft texture and are free from itching, tingling, and pain due to fluff. It is important to be good. Above all, it is important that there is little physical irritation to the skin. Examples of the physical stimulation include stimulation by fluff generated from the end portion of the fiber and fibers, and abrasion stimulation resulting from the stimulation.
  • Nonwoven fabrics in which short fibers are heat-sealed by the heat-through air method to form a sheet are soft and the texture is soft. Since it is worn, there is little occurrence of fluff, and it has been used for many purposes. However, since this nonwoven fabric is composed of short fibers, the fiber ends are present on the surface, there is a tingling touch, and when the fiber ends rub against the skin, it causes scratching irritation. We were not satisfied with aspect.
  • a nonwoven fabric (hereinafter also referred to as “point-bonded nonwoven fabric”) in which short fibers are partially heat-sealed by an embossing roll or the like is sufficient in terms of physical stimulation because the fiber ends are present on the surface in the same manner as a through-air nonwoven fabric Not only that, but not all of the fiber intersections are bonded as compared to the through-air nonwoven fabric, and thus fuzzing is likely to occur and the texture is also inferior.
  • a long fiber nonwoven fabric obtained by thermocompression bonding of a long fiber nonwoven fabric with an embossing roll or the like does not cause the short fiber ends to come out on the surface and hardly causes physical irritation by the fiber ends, but excessive heat is used to prevent fluffing on the surface. Crimping is performed, so that the texture is hard and not only gives a rough feel, but also the periphery of the thermocompression bonding part causes physical irritation.
  • Patent Documents 1 and 2 disclose nonwoven fabrics made of thermoplastic composite fibers having good fuzz resistance and good texture.
  • the thermoplastic fiber is flattened by hot embossing and is subjected to point heat compression, there is a flattened heat fusion part, the bulkiness of the nonwoven fabric is impaired, and the texture is inferior Met.
  • the heat-sealed part was hard, physical stimulation due to friction was large.
  • Patent Document 3 discloses a polyolefin-based non-woven fabric in which a specific polyether compound and a specific polyether-modified silicon are used in combination with a long-fiber non-woven fabric partially thermocompression bonded in a specific thermocompression-bonding shape. .
  • the disclosed nonwoven fabric has good fuzz resistance and low physical irritation due to friction.
  • the polypropylene fibers are bonded only by heat embossing, in order to improve fuzz resistance, It is necessary to increase the number of fused portions, the bulk density is high, and it does not have a plump softness, which is not sufficient in these respects.
  • the problem to be solved by the present invention is a bulky property that is suitable for the top sheet or back sheet member of an absorbent article used for sanitary materials, has a soft touch, has a soft softness, and has little physical irritation to the skin. It is to provide a long fiber nonwoven fabric.
  • the inventors of the present invention are nonwoven fabrics composed of composite long fibers composed of two or more thermoplastic resins, and are non-woven before joining in the nonwoven fabric manufacturing process.
  • the web air permeability, hot air temperature and wind speed at the time of joining within a certain range, hot air can be penetrated while maintaining the bulk of the nonwoven web, and fuzz resistance is improved by adhering fiber intersection points,
  • the present inventors have found that the bulk density can be maintained, and have come to provide a nonwoven fabric that can be suitably used as a sanitary material with small physical irritation to the skin.
  • the said nonwoven fabric characterized by being 10 micrometers or less and an integrated abrasion depth of 80 micrometers or less.
  • a longitudinal and lateral average value of a variation value (MMD) of a friction coefficient of the nonwoven fabric is 0.015 or less.
  • thermoplastic resins are polyolefin resins.
  • nonwoven fabric according to any one of [1] to [7] wherein the nonwoven fabric contains a hydrophilizing agent.
  • a sanitary material comprising the non-woven fabric according to any one of [1] to [8].
  • the nonwoven fabric of the present invention is a nonwoven fabric composed of composite long fibers made of two or more kinds of thermoplastic resins, and the nonwoven fabric is configured so that the nonwoven fabric exhibits specific friction characteristics and thermocompression bonding portion shape index. It can be suitably used as a sanitary material having a low physical irritation to the skin, good fluff resistance, and soft texture achieved by adjusting the degree of fiber adhesion.
  • the composite long fiber constituting the nonwoven fabric of this embodiment is a combination of two or more 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 copolyester, nylon-6, nylon-66, and copolyester.
  • polyamide resins such as polymerized nylon
  • biodegradable resins such as polylactic acid, polybutylene succinate, and polyethylene succinate.
  • Any combination of the thermoplastic resins is possible as long as the desired effects are exhibited, but a combination of thermoplastic resins having a difference in melting point is preferable from the viewpoint of bonding properties between fibers.
  • polyolefin resins from the viewpoint of texture.
  • examples thereof include composite fibers obtained by combining resins such as polyethylene, polypropylene, and copolymers of these monomers with other ⁇ -olefins.
  • Other ⁇ -olefins are those having 3 to 10 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, and 1-octene. Can be mentioned.
  • the fiber shape of the thermoplastic conjugate fiber of this embodiment is preferably a side-by-side type (S / S) or an eccentric type (biased S / C) because a crimped yarn can be easily obtained.
  • the eccentric core portion may protrude from the fiber surface, and the area ratio of the core portion on the fiber surface is preferably 0 to 50%, more preferably 0 to 30%. The lower the ratio of the core part forming the fiber surface, the higher the ratio of the sheath part resulting from the adhesion, and the higher strength and fluff suppression can be obtained.
  • the weight ratio of the resin having the higher melting point in the combination of thermoplastic resins in the fiber is 20 wt% or more and 80 wt% or less, preferably 30 wt% or more and 80 wt% or less, more preferably It is 50 wt% or more and 70 wt% or less.
  • the fiber shape may be not only a normal circular fiber but also a specially shaped fiber such as a deformed fiber.
  • the first component is polypropylene and the second component is polyethylene.
  • the conjugate fiber is an eccentric type, it is preferable that the core portion is the first component and the sheath portion is the second component.
  • Polypropylene is preferred because it is strong and difficult to break during use, and is excellent in dimensional stability during the production of sanitary materials.
  • the polypropylene of the first component in the case of forming with the 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 typified by metallocene.
  • ethylene random copolymer polypropylene may be used. These may be a single type or a combination of two or more types. From the viewpoint of texture, strength, and dimensional stability, it is preferable that the main component is homopolypropylene.
  • the lower limit of the MFR of polypropylene can be 20 g / 10 minutes or more, preferably more than 30 g / 10 minutes, more preferably more than 40 g / 10 minutes, and most preferably more than 53 g / 10 minutes.
  • the upper limit can be 85 g / 10 min or less, preferably 70 g / 10 min or less, and most preferably 60 g / 10 min or less.
  • the measurement method of MFR is in accordance with JIS-K7210 “Testing methods for plastic-thermoplastic melt mass flow rate (MFR) and melt volume flow rate (MVR)”, test temperature 230 ° C., test load 2.16 kg. It is a thing.
  • the second component polyethylene has a high adhesive strength after joining the fibers and has a good texture as a non-woven fabric, and therefore can be suitably used as a sanitary material.
  • polyethylene may be a polymer synthesized by a general Ziegler Natta catalyst, or may be a polymer synthesized by a single site active catalyst typified by metallocene.
  • the polyethylene is preferably high-density polyethylene or linear low-density polyethylene, and the density is preferably 0.92 to 0.97 g / cm 3 , and preferably 0.925 to 0.96 g / cm 3. Is more preferable.
  • the lower limit of polyethylene MI can be 10 g / 10 min or more, preferably more than 15 g / 10 min.
  • the upper limit can be 100 g / 10 min or less, preferably 60 g / 10 min or less, and most preferably 40 g / 10 min or less.
  • the MI measurement method is in accordance with JIS-K7210 “Testing methods for plastics-thermoplastic melt mass flow rate (MFR) and melt volume flow rate (MVR)”, test temperature 190 ° C., test load 2.16 kg. It is a thing.
  • the nonwoven fabric of the present embodiment is preferably manufactured by forming a composite long fiber nonwoven web by a spunbond method from the viewpoint of strength and productivity.
  • composite long fibers are melt-extruded from two or more different extruders, respectively, and discharged as yarns in a state where two or more kinds of thermoplastic resins are combined from a spinneret having a large number of spinning holes. Is done.
  • the discharged yarn is pulled at a high speed by a traction device while being cooled by applying cold air controlled at 5 ° C. to 20 ° C.
  • the yarn coming out of the pulling device is deposited on a conveyor and conveyed as a nonwoven web.
  • the nonwoven web being conveyed may be laminated to form a multilayer laminated nonwoven web.
  • the joining means in the case of joining a nonwoven web composed of thermoplastic conjugate fibers to form a nonwoven fabric is not particularly limited as long as it is a method of heating above the temperature at which the intersections of the fibers melt and bond.
  • 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 on both surfaces of a nonwoven fabric, and a method of introducing into a heated gas are used. From the viewpoint of obtaining more fiber adhesion points at the intersections of the fibers and increasing the breaking strength of the nonwoven fabric, heating with hot air is preferred, and hot air penetration type is particularly preferred.
  • 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 among the combined thermoplastic resins.
  • the temperature is 130 to 155 ° C. at which polyethylene melts and adheres, preferably 135 to 155 ° C., more preferably 140 ° C. to 150 ° C. If the bonding temperature is within this range, the bonding between the fibers appears at the intersection of the fibers, and the strength of the nonwoven fabric can be expressed.
  • the wind speed of the hot air is 0.5 to 3.0 m / s, preferably 0.7 to 2.5 m / s, and more preferably 2.0 m / s or less.
  • the air permeability of the nonwoven web greatly affects the joining state. If the air permeability of the nonwoven web is too low, the hot air is difficult to penetrate and uniform bonding as a nonwoven fabric is difficult to obtain. On the other hand, from the viewpoint of maintaining the strength of the resulting nonwoven fabric, it is not preferable that the air permeability is too high.
  • the air permeability of the finally obtained non-woven fabric is preferably from 300cm 3 / cm 2 / s or more 700cm 3 / cm 2 / s, 300cm 3 / cm 2 / s or more 650 cm 3 / More preferable is cm 2 / s or less.
  • thermocompression part shape index is a partial thermocompression bonding part formed on the nonwoven fabric surface by joining with an embossing roll or hot air treatment, that is, a fusion-bonded area ratio and a fixed area per unit area. This is defined by the fusion circumference.
  • the fused area ratio is the ratio of the area of the fused portion of the long-fiber nonwoven fabric to the total area of the nonwoven fabric
  • the fusion perimeter per fixed area is the fusion included per 20 square millimeters of the long-fiber nonwoven fabric. This is the sum of the circumferences of the department.
  • fusion at the fiber intersection occurs, but if the fusion at the fiber intersection is exposed on the surface in contact with the skin, it is fused as a filmed part including the fiber surface at the fiber intersection. It was included in the landing area and fusion circumference.
  • the part where the nonwoven fabric comes into contact with the skin and gives physical stimulation includes the short fiber ends of the contact surface of the nonwoven fabric and the surface fluff.
  • the short fiber end does not come out on the surface of the nonwoven fabric, and physical irritation due to the fiber end hardly occurs, but prevents fuzz on the surface. Therefore, when the thermocompression bonding area is excessive, or when the thermocompression bonding pressure is excessive and the unevenness of the peripheral part of the fusion part is deep, not only the texture is inferior, but also the peripheral part of the thermocompression bonding part is physically Causes irritation.
  • the nonwoven fabric becomes hard, and the frictional stimulus is large at the time of friction, and the skin is damaged.
  • the peripheral part of the heat-sealed part is a concave part in the heat-fused part and the convex part in the non-thermally-fused part, and the difference in unevenness is large. It will get caught and cause scratches. That is, the fusion area ratio and the circumferential length of the fusion part are closely related to the scratches at the time of friction.
  • the shape index of the non-woven fabric When the shape index of the non-woven fabric is large, the generation of fluff is suppressed in the non-woven fabric, and it is possible to prevent the feeling of touch such as itchiness and tingling by the fluff, but physical irritation is given to the skin by the hardened film. . On the other hand, if the thermocompression bonding portion shape index of the nonwoven fabric is small, physical irritation caused by the contact of the hard part formed into a film with the skin is reduced, and furthermore, the nonwoven fabric has a soft texture.
  • the “thermocompression bonding portion shape index” needs to be 0.05 or more and less than 1.9.
  • the thermocompression bonding portion shape index is less than 0.05, it is not preferable from the viewpoint of preventing fluff, and when it exceeds 1.9, the soft texture is impaired, and it is not preferable from the viewpoint of volume feeling and swelling feeling when compressed.
  • the “thermocompression bonding portion shape index” is more preferably 1.8 or less, and even more preferably 1.5 or less.
  • the “thermocompression bonding portion shape index” is more preferably 0.1 or more, and more preferably 0.3 or more.
  • the maximum scratch depth of the pseudo skin model is 0 ⁇ m or more and 10 ⁇ m or less, and the cumulative scratch depth is 0 ⁇ m or more and 80 ⁇ m or less. is necessary.
  • the maximum scratch depth and the total scratch depth of the pseudo skin model are the surface of the pseudo skin model when the non-woven fabric in contact with the skin is rubbed with the pseudo skin model having an initial compressive stress of 98 mN / cm 2 according to the measurement method described later. This refers to the maximum scratch depth of scratches and the cumulative scratch depth of scratches.
  • scratch refers to a change in the physical surface shape of the pseudo skin model caused by the non-woven fabric produced by rubbing the non-woven fabric and the pseudo skin model.
  • maximum scratch depth exceeds 10 ⁇ m, it is not preferable from the viewpoint of physical irritation to the skin, and more preferably 9 ⁇ m or less.
  • the integrated scratch depth exceeds 80 ⁇ m, more preferably 60 ⁇ m or less, and still more preferably 50 ⁇ m or less.
  • the frictional irritating property of the nonwoven fabric is expressed as the number of scratches, the depth of the scratches, and the width of the scratches on the simulated skin model, depending on the degree of physical stimulation caused by friction with the simulated skin model.
  • the surface of the pseudo skin model is adjusted so as to be flat, but fine irregularities on the surface before applying the frictional stimulus are not recognized as scratches.
  • the maximum flaw depth When the relationship between the maximum flaw depth and the cumulative flaw depth of scratches caused by friction between the nonwoven fabric and the pseudo skin model and the physical irritation due to friction between the nonwoven fabric and the actual skin is examined using a number of panelists, the maximum flaw depth It can be confirmed that the nonwoven fabric with a larger integrated scratch depth tends to feel stronger irritation when the skin is actually rubbed with the nonwoven fabric, and that the disappearance of the texture tends to be greater when observing the skin surface after friction . From this result, it is possible to evaluate the frictional irritation to the skin of the nonwoven fabric in contact with the skin by measuring the maximum scratch depth and the cumulative scratch depth caused by rubbing the pseudo skin model with the nonwoven fabric.
  • the “surface fluff index” of the nonwoven fabric is preferably 3 or more.
  • the surface fluff index is less than 3, fluff is generated on the surface of the nonwoven fabric due to friction with the skin and the like, resulting in a crisp feel and further friction causes physical irritation to the skin surface.
  • the average value of the variation value (MMD) of the friction coefficient of the nonwoven fabric is 0.015 or less.
  • MMD variation value
  • the friction with the skin is a combination of the friction in both the vertical direction and the horizontal direction, the coefficient of friction in both directions is low, smooth and low in resistance.
  • the stress of the frictional resistance is concentrated in the direction where the value of the friction coefficient in the vertical and horizontal directions is small.
  • the frictional resistance stress is averaged. Therefore, the average value of the variation value of the friction coefficient is important as a value indicating the load of physical stimulation on the skin. Differences in the size of the frictional resistance occur, and the frictional resistance stress is averaged because the frictional coefficient fluctuation value in the vertical and horizontal directions has a small friction coefficient fluctuation value and a large frictional value. When the ratio of the coefficient fluctuation value exceeds 20 times, the influence of the value in the larger direction becomes high, and even when the average value of the fluctuation value of the friction coefficient is 0.015 or less, the skin feels rough. Because.
  • the orientation index by X-ray CT of the nonwoven fabric of this embodiment is preferably 0.43 or less, more preferably 0.425 or less.
  • the lower limit is preferably as low as possible, but is preferably 0.30 or more, more preferably 0.33 or more.
  • the bulk density of the nonwoven fabric of this embodiment is preferably in the range of 0.01 g / cm 3 or more and 0.07 g / cm 3 or less, more preferably 0.03 g / cm 3 or more from the viewpoint of strength, and from the viewpoint of texture. More preferably, it is 0.07 g / cm 3 or less.
  • the compression work WC of the nonwoven fabric of the present embodiment is preferably 0.20 gf ⁇ cm / cm 2 or more and 1.00 gf ⁇ cm / cm 2 or less, more preferably 0.25 gf ⁇ cm / cm 2 or more and 0.0. 80 gf ⁇ cm ⁇ cm 2 or less. Holding the compression work WC within this range is preferable from the viewpoint of cushioning properties as a nonwoven fabric used for sanitary materials.
  • the average single yarn fineness of the composite long fibers constituting the nonwoven fabric of the present embodiment is preferably 0.5 dtex or more and 10.0 dtex or less, more preferably 0.7 dtex or more and 8.0 dtex or less, and further preferably 0.9 dtex. More than 5.0 dtex. From the viewpoint of spinning stability, it is preferably 0.5 dtex or more, and from the viewpoint of the texture of the nonwoven fabric used for the sanitary material, it is preferably 10.0 dtex or less.
  • the composite continuous fiber preferably has a helical crimp from the viewpoint of maintaining the texture and bulkiness of the nonwoven fabric.
  • the number of crimps of the fiber is preferably 5 pieces / inch or more and 45 pieces / inch or less, more preferably 10 pieces / inch or more and 40 pieces / inch or less.
  • the number of crimps is less than 5 pieces / inch, the resulting nonwoven fabric is insufficiently bulky.
  • the number of crimps exceeds 45 pieces / inch, the appearance of the nonwoven fabric is impaired due to uneven fiber dispersion.
  • the basis weight of the nonwoven fabric of the present embodiment is preferably 8 g / m 2 or more and 80 g / m 2 or less, more preferably 10 g / m 2 or more and 40 g / m 2 or less, and further preferably 10 g / m 2 or more and 30 g / m 2 or less. is there. If it is 8 g / m 2 or more, the non-woven fabric used in the sanitary material satisfies the strength, and if it is 80 g / m 2 or less, the non-woven fabric used in the sanitary material, which is the object of the present invention, is satisfied. Does not give a thick impression.
  • the nonwoven fabric of this embodiment may contain a hydrophilizing agent.
  • the hydrophilizing agent used is a nonionic active agent to which ethylene oxide such as higher alcohol, higher fatty acid, alkylphenol or the like is added in consideration of safety to the human body and safety in the process, alkyl phosphate salt, etc.
  • Anionic activators such as alkyl sulfates are preferably used alone or as a mixture.
  • an existing method such as a dipping method, a spraying method, or a coating (kiss coater, gravure coater, die coater) method can be generally used by using a diluted hydrophilizing agent, and if necessary, mixing is performed in advance.
  • the hydrophilizing agent diluted with a solvent such as water.
  • a drying step may be required.
  • a drying method at that time a known method using convective heat transfer, conduction heat transfer, radiant heat transfer, or the like can be employed, and a drying method using hot air or infrared rays, a drying method using heat contact, or the like can be used.
  • the adhesion amount of the hydrophilizing agent varies depending on the required performance, but usually it is 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 and 0%.
  • the adhesion amount is within this range, the hydrophilic performance as a sanitary material top sheet is satisfied, and the processing suitability is also good.
  • a hydrophilic agent is applied to the nonwoven fabric to improve its hydrophilicity and it is used as a sanitary material top sheet, urine and blood permeate the nonwoven fabric surface, so it does not remain on the skin and is chemically stimulated by ammonia and the like. Since the physical irritation to the skin is small and the skin is hardly damaged, inflammation such as dermatitis is less likely to occur against the chemical irritation.
  • the nonwoven fabric of the present embodiment is achieved by using a composite long fiber nonwoven fabric made of two or more thermoplastic resins and adjusting the fusion part on the surface in contact with the skin. Since a composite long fiber nonwoven fabric is used, the low melting point components of the composite fiber are bonded by heat fusion without completely forming a film at some fiber intersections. Since it is not damaged and stress concentration does not occur in the filmed portion, physical stimulation is reduced. Moreover, practical strength and fluff prevention are achieved by heat fusion bonding at the fiber intersection.
  • the degree of freedom of the constituent fibers of the long-fiber non-woven fabric is determined by the degree of thermal fusion bonding of the film-formed portion by thermocompression bonding or the like and the low melting point component of the composite fiber, and is indicated by the toughness index of the long-fiber non-woven fabric.
  • the toughness index is a value obtained by dividing the product of the breaking and breaking elongation of the nonwoven fabric by the basis weight of the nonwoven fabric, preferably 40 or more and 250 or less, more preferably 50 or more and 150 or less.
  • Weight per unit (g / m 2 ) According to JIS-L1906, 5 specimens measuring 20 cm in the MD direction ⁇ 5 cm in the CD direction were arbitrarily sampled and the mass was measured, and the average value was converted into the weight per unit area.
  • Air permeability (cm 3 / cm 2 / s) The measurement was performed according to the fragile method described in JIS L-1096. Ten points were collected and measured, and the average value of the measured values was calculated.
  • (D) Non-contact of the surface of the artificial skin model with a width of 1 cm caused by friction and a central portion of a friction trace of 2 cm in the friction direction, a maximum scratch depth of 1 cm width in a direction perpendicular to the friction direction, and an integrated scratch depth. Measure using a laser surveying instrument.
  • (E) Measure the maximum scratch depth and cumulative scratch depth on the surface of the pseudo skin model when rubbing about 10 locations at 1 cm intervals in the vertical and horizontal directions of the sample, and calculate the average length and width of the maximum scratch depth of the sample piece. The integrated scratch depth.
  • the maximum scratch depth and cumulative scratch depth of the sample are the average values of the above three points.
  • Thermocompression bonded portion shape index (a) A sample of 5 cm ⁇ 5 cm is taken from an arbitrary place of the nonwoven fabric. (B) 25 samples of 1 cm ⁇ 1 cm are prepared from the sample, and the surface is photographed with a microscope to obtain 25 magnified photographs of 25 times. (C) From the obtained photograph, the ratio of the fusion-bonded area of the nonwoven fabric to the nonwoven fabric surface area is determined. (D) From the obtained photograph, a value indicating the total sum of the circumferences of the fused and filmed portions included in a fixed area of 20 square millimeters is obtained.
  • Thermocompression bonding section shape index thermal fusion area ratio ⁇ fusion circumference per fixed area Formula (1) ⁇ In the formula, the fusion area ratio: the ratio of the fusion-bonded area of the long-fiber nonwoven fabric to the total area of the long-fiber nonwoven fabric; the fusion circumference per fixed area: the fusion-bonded portion contained per 20 square millimeters of the long-fiber nonwoven fabric Sum of perimeters of ⁇ To obtain the thermocompression bonding portion shape index.
  • the thermocompression bonding portion shape index is the average value of the 25 points.
  • X-ray target Cu X-ray tube voltage: 40 kV X-ray tube current: 30 mA Lens: 1.08 ⁇ m / pix Binning: 2 Rotation angle: 180 ° Number of projections: 1000 sheets Exposure time: 10 seconds / sheet Number of camera pixels: 3300 ⁇ 2500 Reconstruction: Feldkamp method A three-dimensional tomogram obtained by CT measurement was subjected to image analysis, and orientation indices Ix, Iy, Iz of three orthogonal axes (x, y, z) were obtained. The thickness direction of the sample to be mainly evaluated was matched with the z direction.
  • Toughness index breaking strength (N / 50 mm) ⁇ breaking elongation (%) / weight per unit (g / m 2 )
  • the second component is the second component
  • the first component discharge rate is 0.4 g / min ⁇ Hole
  • the second component discharge rate is 0.4 g /
  • the total single-hole discharge rate is 0.8 g / min ⁇ Hole in min ⁇ Hole
  • the fiber shape is an eccentric sheath core structure
  • the fiber in which the ratio of the first component to the second component is 50/50 is obtained by the spunbond method.
  • Extrusion was performed at a spinning temperature of 220 ° C., and this filament group was extruded toward a moving collection surface at a spinning speed of 3,000 m / min using a high-speed airflow traction device using an air jet, and a long fiber having an average single yarn fineness of 2.8 dtex.
  • a nonwoven web was prepared.
  • thermocompression-bonding roll in which an engraving roll and a smooth roll were combined.
  • thermocompression-bonding portion shape index the conveyance speed at the time of passing hot air, the temperature and pressure of the thermocompression-bonding roll, the speed of the conveyance conveyor and the winding device are adjusted.
  • a composite continuous fiber nonwoven fabric having an average single yarn fineness of 2.8 dtex crimped 30 pieces / inch and a basis weight of 20 g / m 2 was obtained.
  • Example 4 The composite long fiber nonwoven fabric obtained in the same manner as in Example 2 was applied to a corona discharge treatment machine under the condition of a discharge amount of 40 W ⁇ min / m 2 (discharge degree: 4.0 W / cm 2 ) in an atmosphere at room temperature of 22 ° C. A nonwoven fabric with a wetting tension of 39 mN / m was obtained. A polyether-based hydrophilizing agent was applied to the obtained non-woven fabric by a spraying method, followed by hot air drying at 110 ° C. for 30 seconds to obtain a long-fiber non-woven fabric having an agent concentration adhesion amount of 0.3% by weight. The obtained nonwoven fabric had satisfactory performance as a diaper top sheet.
  • Example 5 Polypropylene (PP) resin with an MFR of 40 g / 10 min (measured according to JIS-K7210, at a temperature of 230 ° C. and a load of 2.16 kg) is the first component, and MI is 26 g / 10 min (according to JIS-K7210, temperature High-density polyethylene (HDPE) resin (measured at 190 ° C.
  • PP polypropylene
  • MFR 40 g / 10 min
  • MI 26 g / 10 min
  • HDPE temperature High-density polyethylene
  • the second component is the second component
  • the first component discharge rate is 0.4 g / min ⁇ Hole
  • the second component discharge rate is 0.4 g /
  • the total single-hole discharge rate is 0.8 g / min ⁇ Hole in min ⁇ Hole
  • the fiber shape is an eccentric sheath core structure
  • the fiber in which the ratio of the first component to the second component is 50/50 is obtained by the spunbond method.
  • Extrusion was performed at a spinning temperature of 235 ° C., and this filament group was extruded toward a moving collection surface at a spinning speed of 2,500 m / min using a cold air push-type airflow traction device, and a long fiber having an average single yarn fineness of 2.8 dtex.
  • Woven web was prepared.
  • the nonwoven fabric was thermally bonded by passing hot air having a hot air temperature of 145 ° C. and a hot air speed of 1.0 m / s through the obtained nonwoven web.
  • the conveyance speed at the time of passing hot air and the speed of the winding device were adjusted to obtain a composite long fiber nonwoven fabric with a basis weight of 20 g / m 2 having a predetermined thermocompression bonding portion shape index.
  • Example 6 The composite long fiber nonwoven fabric obtained in the same manner as in Example 5 was applied to a corona discharge treatment machine under the condition of a discharge amount of 40 W ⁇ min / m 2 (discharge degree: 4.0 W / cm 2 ) in an atmosphere at room temperature of 25 ° C. A nonwoven fabric with a wetting tension of 39 mN / m was obtained. A polyether-based hydrophilizing agent was applied to the obtained non-woven fabric by a spraying method, followed by hot air drying at 120 ° C. to obtain a long-fiber non-woven fabric having an agent concentration adhesion amount of 0.35% by weight. The obtained nonwoven fabric had satisfactory performance as a diaper top sheet.
  • Polypropylene (PP) resin having an MFR of 55 g / 10 min (measured at a temperature of 230 ° C. and a load of 2.16 kg according to JIS-K7210) is extruded as a single component at a spinning temperature of 220 ° C. by a spunbond method.
  • a long-fiber nonwoven web having an average single yarn fineness of 2.8 dtex was prepared by extruding toward a moving collection surface at a spinning speed of 3,000 m / min using a high-speed airflow traction device using an air jet. Subsequently, the obtained nonwoven web was subjected to a flat roll and an embossing roll at 141 ° C.
  • the fibers are bonded to each other, a nonwoven fabric having a basis weight of 20 g / m 2 , an air permeability of 456 cm 3 / cm 2 / s, and a thermocompression bonding section shape index 1.9 in which the fibers are not crimped. Obtained.
  • the obtained nonwoven fabric had a high bulk density, had no cushioning properties, and had a hard texture.
  • the core component that is the first component is polypropylene having a melting point of 162 ° C.
  • the sheath component that is the second component is high-density polyethylene having a melting point of 130 ° C.
  • the short fibers having a fineness of 2.5 dtex and a cut length of 38 mm are used as the constituent fibers.
  • the nonwoven web was obtained by the card method. Next, the obtained nonwoven web was bonded to each other by hot air bonding at a hot air temperature of 140 ° C. and a hot air wind speed of 1.0 m / s, and the air permeability was 717 cm 3 / cm 2 / s with a basis weight of 18 g / m 2.
  • a composite short fiber nonwoven fabric of 5 / inch was obtained. The obtained nonwoven fabric had a low elongation, a low toughness index, and a hard texture.
  • the composite long fiber nonwoven fabric of the present invention has bulkiness and cushioning softness and high strength and elongation, it can be suitably used for the production of sanitary materials.
  • sanitary material it can be used suitably for disposable diapers, sanitary napkins or incontinence pads, and can be used as a top sheet on the surface and a back sheet on the outside.
  • Applications are not limited. For example, masks, body warmers, tape base fabrics, tarpaulin base fabrics, patch medicinal base fabrics, emergency bond base fabrics, packaging materials, wipe products, medical gowns, bandages, clothing, skin care It can also be used for sheets.

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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)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Dermatology (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un non-tissé à fibres longues qui est approprié pour des éléments de feuille supérieure et de feuille arrière d'articles absorbants utilisés en tant que matières hygiéniques, qui possède une bonne sensation tactile et une douceur duveteuse, et qui présente peu de stimulation physique de la peau et un volume élevé. Ce non-tissé est un non-tissé, comprimé partiellement par la chaleur, de fibres longues composites formé d'au moins deux types de résine thermoplastique, et est caractérisé en ce que l'indice de forme de la partie comprimée par la chaleur est supérieur ou égal à 0,05 et inférieur à 1,9, la profondeur d'abrasion maximale est de 10 µm ou moins, la profondeur d'abrasion cumulative étant de 80 µm ou moins.
PCT/JP2017/006165 2016-02-22 2017-02-20 Non-tissé à fibres longues à sensation tactile supérieure Ceased WO2017145993A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780011534.6A CN108699745B (zh) 2016-02-22 2017-02-20 皮肤触感优异的长纤维无纺布
JP2018501672A JP6542974B2 (ja) 2016-02-22 2017-02-20 肌触り感に優れた長繊維不織布
MYPI2018702596A MY184560A (en) 2016-02-22 2017-02-20 Long fiber nonwoven fabric with superior tactile sense

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JP2016031358 2016-02-22
JP2016-031358 2016-02-22

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JP2020070518A (ja) * 2018-10-31 2020-05-07 株式会社クラレ 絡合不織布及び人工皮革
WO2022239838A1 (fr) * 2021-05-12 2022-11-17 旭化成株式会社 Tissu non tissé pour des matériaux sanitaires, matériau de base pour des feuilles de polymère sap et feuille de polymère sap
JPWO2023032763A1 (fr) * 2021-08-30 2023-03-09
CN116801755A (zh) * 2021-01-28 2023-09-22 花王株式会社 卫生口罩用片

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JP7252178B2 (ja) * 2020-06-30 2023-04-04 ユニ・チャーム株式会社 加飾シートの製造方法、及び加飾シート
CN113576766A (zh) * 2021-08-04 2021-11-02 北京倍舒特妇幼用品有限公司 一种基于偏心纤维的高渗透卫生制品

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WO2022239838A1 (fr) * 2021-05-12 2022-11-17 旭化成株式会社 Tissu non tissé pour des matériaux sanitaires, matériau de base pour des feuilles de polymère sap et feuille de polymère sap
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TW201732108A (zh) 2017-09-16
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MY184560A (en) 2021-04-02
CN108699745A (zh) 2018-10-23
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