WO2011018921A1 - 不織布およびその製造方法 - Google Patents

不織布およびその製造方法 Download PDF

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Publication number
WO2011018921A1
WO2011018921A1 PCT/JP2010/060418 JP2010060418W WO2011018921A1 WO 2011018921 A1 WO2011018921 A1 WO 2011018921A1 JP 2010060418 W JP2010060418 W JP 2010060418W WO 2011018921 A1 WO2011018921 A1 WO 2011018921A1
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WIPO (PCT)
Prior art keywords
nonwoven fabric
short fibers
cross
raised portion
web
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/JP2010/060418
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English (en)
French (fr)
Japanese (ja)
Inventor
山口　正史
水谷　聡
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.)
Unicharm Corp
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Unicharm Corp
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Filing date
Publication date
Application filed by Unicharm Corp filed Critical Unicharm Corp
Priority to EP10808105.0A priority Critical patent/EP2465988A4/en
Priority to US13/389,464 priority patent/US9222206B2/en
Priority to CN201080043106XA priority patent/CN102575398A/zh
Publication of WO2011018921A1 publication Critical patent/WO2011018921A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
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    • 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
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    • 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
    • A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
    • A61F13/51108—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction
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    • 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
    • A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
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    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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    • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/485—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with weld-bonding
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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    • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
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    • D04H1/495—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet for formation of patterns, e.g. drilling or rearrangement
    • 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
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    • D04H1/5405—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 by welding together the fibres, e.g. by partially melting or dissolving at spaced points or locations
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    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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    • 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
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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    • 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
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    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions

  • the present invention relates to a non-woven fabric and a method for producing the same, and more particularly to a non-woven fabric suitable for use as a liquid-permeable surface sheet of a body fluid-absorbing article using a disposable diaper as an example and a method for producing the same.
  • an absorbent body in a body fluid absorbent article such as a disposable diaper or a sanitary napkin is coated with a liquid-permeable surface sheet.
  • nonwoven fabric is used as the liquid-permeable surface sheet, and short fibers formed of a thermoplastic synthetic resin are often used for the nonwoven fabric.
  • the nonwoven fabric disclosed in Japanese Patent Application Laid-Open No. 2008-25080 (Patent Document 1) is suitable for use as a surface sheet.
  • This non-woven fabric is formed by blowing hot air onto a web made of thermoplastic synthetic resin short fibers, and has ridges and valleys extending in the machine direction in parallel to each other, and orthogonal to the machine direction. In the intersecting direction, the ridges and valleys are alternately arranged.
  • JP 2008-25080 A JP 2008-25080 A
  • valleys are formed in the web immediately below the nozzles by blowing hot air from a plurality of nozzles arranged in the width direction of the web, and between the adjacent nozzles.
  • a raised portion is formed on the web.
  • the apparent density at the ridge is higher than the apparent density at the valley.
  • This invention makes it a subject to improve the conventional nonwoven fabric so that the permeation
  • This invention for solving the above-mentioned problems includes a first invention relating to a nonwoven fabric and a second invention relating to a method for producing the nonwoven fabric.
  • the first invention of the present invention is directed to a plurality of ridges formed by short fibers welded to each other, having a front surface and a back surface, and extending in parallel to each other in the one surface. And a plurality of valleys between the raised portions and extending in the one direction.
  • the features of the first invention are as follows. That is, when the non-woven fabric is placed on the horizontal surface on the back side and a cross section in a direction perpendicular to the one direction is observed, the short fibers in the raised portion are between the back surface and the horizontal surface in the raised portion. A high void portion that is a void larger than the gap is formed, and the short fibers are inclined so as to extend in the thickness direction of the nonwoven fabric at least near the top of the raised portion. And
  • an average value of an intersection angle between a reference line passing through the apex of the raised portion and perpendicular to the horizontal plane and the short fiber is 75 degrees or less.
  • the total cross-sectional area of the cross-sectional area of the raised portion and the cross-sectional area of the high-gap portion is out of the cross-sectional area of the raised portion.
  • the void area ratio which is the proportion of the sum of the area occupied by the gaps between the short fibers and the cross-sectional area of the high void portion, is 3.5 to 25.0%.
  • an elastic recovery rate of the height of the raised portion after a load of 20 g / cm 2 is applied to the surface for 3 minutes and then allowed to stand for 5 minutes is at least 85. %.
  • the nonwoven fabric has a unit mass of 10 to 80 g / m 2 , and the short fibers have a fineness of 1 to 11 dtex and a fiber length of 20 to 80 mm. It has been hydrophilized.
  • the short fiber is a composite fiber formed of two types of thermoplastic synthetic resins having different melting temperatures, and of the two types, the melting temperature is the same. They are welded together via the lower thermoplastic synthetic resin.
  • the second invention of the present invention is intended and characterized in that it is a method for producing the nonwoven fabric according to claim 1, and that the production process includes the following steps; (1) A web formed of short fibers of thermoplastic synthetic resin and having a front surface and a back surface is placed on a breathable support base and travels in the machine direction while applying a first suction from below the support base; The first jet air, which is heated jet air and has an air volume that is less than three times the intake air amount of the first suction, is blown against the web in a direction from the front surface toward the back surface, thereby thickening the web.
  • a first step which is a pretreatment step of the web for welding the short fibers while compressing in the longitudinal direction, and (2) after the pretreatment step, while applying a second suction from below the support base
  • the web placed on a support base is caused to travel in the machine direction, and a plurality of nozzles arranged at predetermined intervals in a crossing direction perpendicular to the machine direction are provided to the second sucker. And blowing a second jet air having an air volume that is three times or more of the intake air amount of the chamber in a direction from the front surface to the back surface of the web to reflect a part of the air volume of the second jet air on the support base.
  • the fibers are inclined in the thickness direction of the nonwoven fabric in the vicinity of the apex, and the high-viscous excrement such as soft stool is raised by having a high void portion on the back side It becomes easy to move downward from the top of the part or to pass through the raised part.
  • the fragmentary perspective view of a nonwoven fabric The photograph which shows the cross section of the cross direction in the protruding part of a nonwoven fabric. The figure which shows a part of manufacturing process of a nonwoven fabric. The front view of a 2nd nozzle part. The figure which shows the relationship between a space
  • the nonwoven fabric 1 and 2 are a perspective view schematically showing a part of the nonwoven fabric 1 and a photograph showing a part of the cross section of the nonwoven fabric 1 enlarged 50 times.
  • the nonwoven fabric 1 is indicated by double-headed arrows A, B, and C in which the length direction, the width direction, and the thickness direction are orthogonal to each other.
  • the front surface 2 and the back surface 3 that is the opposite surface
  • the surface 2 is formed with ridges 6 and valleys 7 extending in parallel with each other in the length direction A, and these ridges 6 and valleys 7 alternately arranged in the width direction B define undulations.
  • the ridges 6 have a height Ha in the thickness direction C from the horizontal plane H, and the heights of the ridges 6 are substantially the same.
  • the nonwoven fabric 1 is made of short fibers 11 formed of a thermoplastic synthetic resin, preferably short fibers 11 having a fineness of 1 to 11 dtex and a fiber length of 20 to 80 mm, and hot air is blown onto the short fibers 11 to weld them together. is there.
  • the nonwoven fabric 1 is also suitable for use as a liquid-permeable surface sheet of a body fluid-absorbing wearing article such as a disposable diaper or a sanitary napkin.
  • the nonwoven fabric 1 when used as such is 10 to 10 It is preferable to have a unit mass of 80 g / m 2 , and it is preferable that the short fibers 11 have been subjected to a hydrophilic treatment.
  • the surface 2 of the nonwoven fabric 1 has a dimension Wc in the width direction B of the valley portion 7 forming the concave stripe portion in the range of 0.4 to 2 mm, and the width direction B of the raised portion 6 forming the convex stripe portion.
  • the dimension W a is in the range of 2 to 5 mm.
  • the height H a of the ridges 6 are in the range of 1 ⁇ 5 mm.
  • Valley 7 is preferably in the 0.7 ⁇ 2.5 mm lower place than the height H a.
  • the short fibers 11 are formed by combining two types of synthetic resins having different melting temperatures in order to facilitate welding of the short fibers 11 and to make the nonwoven fabric 1 elastically compressible in the thickness direction C.
  • the synthetic fibers having the lower melting temperature are welded to each other by melting.
  • combinations of synthetic resins include known and well-known combinations such as polyethylene and polyester, polyethylene and polypropylene, and the like.
  • the composite fiber may be a sheath-and-core type or a side-by-side type.
  • the sheath-and-core type composite fiber may be a concentric type or an eccentric type.
  • These composite fibers are preferably crimped by thermal treatment or mechanical treatment.
  • the staple formed in polyethylene, a polypropylene, nylon, polyester etc. other than a composite fiber can also be used for the short fiber 11 in this invention.
  • FIGS. 3 and 4 are a partial view of a process used to manufacture the nonwoven fabric 1 of FIGS. 1 and 2 and a front view of the second nozzle portion 920 in the partial view.
  • a card belt 100 having a unit mass of 10 to 80 g / m 2 formed by the short fibers 11 is placed on a running belt 200 having air permeability in the thickness direction, which is a support base, and a machine direction MD. Drive to.
  • a mesh plate having an opening of 30 mesh or more is used for the running belt 200.
  • a first step 901 which is a pretreatment step for stabilizing the formation of the card web 100 by welding the short fibers 11 while compressing the card web 100 in the thickness direction, and a pretreatment And a second step 902 for forming the raised portion 6 on the card web 100.
  • the first jet air 911 heated from the first nozzle portion 910 is blown against the card web 100, and the first jet air 911 passes through the belt 200 and is applied to the first suction box 912. Sucked.
  • the air volume of the first jet air 911 is set to be less than three times the intake air amount of the first suction box 912.
  • the temperature of the first jet air 911 is set to a temperature at which the short fibers 11 can be welded together.
  • a plurality of heated second jet airs 921 are sprayed from the second nozzle portion 920 to the card web 100 processed in the first step 901.
  • the second jet air 921 is formed by partially moving the card web 100 having a stable formation obtained in the first step 901 in the cross direction CD to form the raised portion 6 between the second jet air 921. Therefore, the air volume of the second nozzle portion 920 for that purpose is set to be at least three times the intake air amount of the second suction box 925.
  • the second jet air 921 is blown toward the card web 100 from a plurality of nozzles (not shown) provided with a required center-to-center distance a in the intersecting direction CD.
  • the second jet air 921 passes through the belt 200 and is sucked into the second suction box 925, and the second jet air 921 in the cross direction CD along the belt 200.
  • the tendency to separate into flows Q and R toward both sides becomes stronger (see FIG. 4), and when the air volume of the second jet air 921 exceeds about three times the intake air amount of the second suction box 925, the second jet air 921
  • the formation of the raised portion 6, the valley portion 7, and the high gap portion 21 due to the action of becomes gradually more remarkable.
  • a breathable belt of 30 mesh or more is used as the belt 200, or the aperture ratio is increased. 5 to 30%, and a non-venting part formed between the opening part and the width of the non-venting part in the range of 1 to 20 mm may be used. It is preferable to set the air volume from the section 920 to be three times or more the intake air amount of the second suction box 925.
  • the position in the cross direction CD of the second jet air 921 sprayed with a center distance a coincides with the position of the valley 7 in the nonwoven fabric 1 of FIG.
  • a part of the short fibers 11 located immediately below the second jet air 921 moves so as to be equally distributed to both sides of the cross direction CD, and participates in the formation of the raised portion 6.
  • What remains immediately below the two jet air 921 forms a trough 7.
  • the short fiber 11 also crosses in such a way that what is between the adjacent second jet airs 921 is directed to a center line f (see FIG. 4) that bisects the center-to-center distance a. Move to CD to form ridge 6.
  • the flows Q and R of the second jet air 921 act so as to push up the short fibers 11 lying horizontally on the belt 200 as the web 100 along the center line f.
  • it also acts to form a relatively large high gap 21 (see FIG. 2) between the back surface 3 and the belt 200 in each raised portion 6.
  • the short fibers 11 that lie substantially horizontally on the upstream side of the second step 902 are included in the surface 2 of the raised portion 6.
  • the direction is changed so as to be directed in the vertical direction along the inclined surface 2a.
  • the nonwoven fabric 1 is a top sheet of a disposable diaper. If it is used as, the transfer to the absorber which the nonwoven fabric 1 coat
  • the void area which is the sum of the area of the high void portion 21 formed and the area of the gap 22 between the short fibers 11 in the raised portion 6 is the sum of the cross-sectional area of the raised portion 6 and the area of the high void portion 21.
  • the area ratio is called the void area ratio in the present invention, and the area ratio tends to change with the air volume of the second jet air 921 ejected from the second nozzle section 920.
  • the method for measuring the void area ratio is as described below.
  • the short fiber 11 was a concentric composite fiber in which the sheath component was polyethylene, the core component was polyester, and the volume ratio of the sheath to the core was 6: 4.
  • the composite fiber had a fineness of 2.6 dtex, a fiber length of 64 mm, a mechanical crimp of 15 per 25.4 mm, and was hydrophilized.
  • the card web 100 was obtained by processing the short fibers 11 with a card machine, and had a unit mass of 30 g / m 2 . In the steps shown in FIGS.
  • first nozzle portion 910 the conditions in the first nozzle portion 910 were as follows: nozzle diameter: 1 mm, distance between nozzle centers in cross direction CD: 2 mm, nozzle and card web Distance: 5 mm, temperature of first jet air 911: 140 ° C., air volume of first jet air 911: 3.3 L / min, intake speed of first suction box 912: 5 m / sec.
  • the conditions in the second nozzle portion 920 were as follows: nozzle diameter: 1 mm, distance between nozzle centers a in the cross direction CD: 4 mm, distance between the nozzle and the surface of the card web 100: 5 mm,
  • the temperature of the two jet air 921 is 180 ° C.
  • the air volume of the second jet air 921 is 4.0 to 8.3 L / min
  • the intake speed of the second suction box 925 is 5 m / sec.
  • the nonwoven fabric obtained under these conditions is passed through a heat treatment chamber (not shown) having a length of 1.8 m in the machine direction MD at a speed of 20 m / min after the step of FIG.
  • the short fibers 11 were further welded together.
  • hot air at 138 ° C.
  • the temperatures of the first and second jet air 911 and 921 in the first nozzle portion 910 and the second nozzle portion 920 are set temperatures of air supplied from the upstream to the nozzle, and these first, The temperature when the second jet air 911 and 921 is blown onto the short fibers 11 is lower than the set temperature, but the temperature is not measured.
  • Table 1 shows the non-woven fabric voids obtained by fixing the suction speed of the second suction box 925 to 5 m / sec and changing the air volume of the second jet air 921 between 4.0 and 8.3 L / min. The measurement results of partial area ratio, loose stool permeation time, bulk recovery rate, and average fiber angle are shown.
  • FIG. 5 shows the relationship between the void area ratio in Table 1 and the stool permeation time.
  • the non-woven fabric 1 according to the present invention has a void area ratio in FIG. 5 of at least 3.5%, and such a non-woven fabric 1 can reliably shorten the permeation time of soft stool.
  • the nonwoven fabric 1 having such an action also preferably has a bulk recovery rate of at least 60%, and preferably has an average fiber angle of 75 degrees or less at the top of the raised portion 6.
  • FIG. 6 shows a sequence of photographs (a) to (c) for measuring the void area ratio in the raised portion 6 of the nonwoven fabric obtained in the steps of FIGS.
  • the procedure is as follows. Note that the photograph in FIG. 6A is the same as the photograph in FIG. A.
  • Preparation of measurement specimen (1) Cut the nonwoven fabric to be measured with the replacement blade HA-100 for KOKUYO Cutter Knife HA-7B (trade name), and prepare a specimen having a cross-section in the cross direction CD of the nonwoven fabric. And place it on the horizontal surface H of the measuring table. (2) An acrylic plate (not shown) is placed on the surface 2 of the specimen, a weight (not shown) is further placed, and a load of 0.6 g / cm 2 is applied to the specimen.
  • the time from when artificial stool starts entering the specimen until it remains on the upper surface of the specimen and stops moving is determined as the stool permeation time.
  • the difference in the weight of the specimen before and after the measurement of the stool permeation time was determined, and the difference was defined as the amount of residual soft stool in the specimen.
  • the void area ratio in Table 1 was 2.1 to 6.3%.
  • the remaining amount of loose stool for a certain nonwoven fabric was in the range of 4 to 5 g and could be regarded as almost constant.
  • the procedure for measuring the bulk recovery rate in Table 1 is as follows. (1) Cut the nonwoven fabric to be measured into 100 ⁇ 100 mm and place it on a horizontal plane as a measurement specimen. (2) An acrylic plate having a thickness T 0 is placed on the surface of the specimen, a weight is further placed on the acrylic board, a load of 3 g / cm 2 is applied to the specimen, and the specimen is allowed to stand for 3 minutes. (3) Next, by using the dial gauge for measuring the thickness T 1 of the specimen and the acrylic plate from the top of the acrylic plate.
  • FIG. 7 and 8 are a photograph showing a cross section of a nonwoven fabric for explaining the procedure for measuring the average fiber angle in Table 1, and a diagram schematically showing a part of the cross section.
  • the nonwoven fabric to be measured for example, the nonwoven fabric 1 of FIG. 1 is cut to 100 ⁇ 100 mm to form a measurement specimen 30, and the specimen 30 is heated at 70 ° C. for 30 minutes to handle the specimen 30. The wrinkles and creases generated in step 1 are eliminated to make the specimen 30 as flat as possible.
  • the standard replacement blade HA-100 for the KOKUYO cutter knife HA-7B (trade name)
  • the specimen 30 is cut in the cross direction CD, and the cut surface 31 for observation (see FIG. 7) is obtained.
  • the sample 30 is placed on a horizontal surface.
  • the cut surface 31 is observed with an electron microscope (a real surface view microscope VE-7800 manufactured by Keyence Corporation), and a 30-times enlarged photograph (see FIG. 7) of the cut surface 31 is taken. In photographing, the entire height of the raised portion 6 in the specimen is taken into view.
  • a horizontal line H that coincides with the horizontal plane and a vertical reference line Y 1 that passes through the apex of the raised portion 6 and is orthogonal to the horizontal plane H are drawn.

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CN111850819A (zh) * 2019-04-26 2020-10-30 尤妮佳股份有限公司 无纺布、包含该无纺布的层叠体及吸收性物品
CN111850819B (zh) * 2019-04-26 2023-05-09 尤妮佳股份有限公司 吸收性物品
CN110295456A (zh) * 2019-05-15 2019-10-01 肥城泰西无纺材料有限公司 一种复合涤纶短纤土工布及制备方法
CN110295456B (zh) * 2019-05-15 2022-02-18 肥城泰西无纺材料有限公司 一种复合涤纶短纤土工布及制备方法

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MY157140A (en) 2016-05-13
CN102575398A (zh) 2012-07-11
KR20120045044A (ko) 2012-05-08
EP2465988A4 (en) 2014-01-01
KR101539831B1 (ko) 2015-07-27
US20120141742A1 (en) 2012-06-07
EP2465988A1 (en) 2012-06-20
US9222206B2 (en) 2015-12-29
TW201118212A (en) 2011-06-01
JP5590834B2 (ja) 2014-09-17

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