WO2017171017A1 - Tissu non tissé pour article absorbant, feuille supérieure pour article absorbant et article absorbant les comprenant - Google Patents

Tissu non tissé pour article absorbant, feuille supérieure pour article absorbant et article absorbant les comprenant Download PDF

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Publication number
WO2017171017A1
WO2017171017A1 PCT/JP2017/013641 JP2017013641W WO2017171017A1 WO 2017171017 A1 WO2017171017 A1 WO 2017171017A1 JP 2017013641 W JP2017013641 W JP 2017013641W WO 2017171017 A1 WO2017171017 A1 WO 2017171017A1
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WO
WIPO (PCT)
Prior art keywords
fiber
fiber layer
nonwoven fabric
fibers
water
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/JP2017/013641
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English (en)
Japanese (ja)
Inventor
保紀 中村
悦聖 五百藏
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.)
Daiwabo Holdings Co Ltd
Daiwabo Polytec Co Ltd
Original Assignee
Daiwabo Holdings Co Ltd
Daiwabo Polytec 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 Daiwabo Holdings Co Ltd, Daiwabo Polytec Co Ltd filed Critical Daiwabo Holdings Co Ltd
Priority to CN201780020203.9A priority Critical patent/CN109069321A/zh
Priority to KR1020187031218A priority patent/KR20180131582A/ko
Priority to JP2018509662A priority patent/JPWO2017171017A1/ja
Publication of WO2017171017A1 publication Critical patent/WO2017171017A1/fr
Anticipated expiration legal-status Critical
Priority to JP2022118698A priority patent/JP7433583B2/ja
Priority to JP2024000780A priority patent/JP7848249B2/ja
Ceased legal-status Critical Current

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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
    • 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
    • A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
    • 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 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • 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
    • A61F13/53—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 absorbing medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • A—HUMAN NECESSITIES
    • 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
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
    • A61F2013/15934—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for making non-woven
    • A61F2013/15991—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for making non-woven in making composite multi-layered product
    • 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
    • A61F2013/51002—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 with special fibres
    • A61F2013/51023—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 with special fibres being polymeric fibres
    • A61F2013/51033—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 with special fibres being polymeric fibres being hydrophilic
    • 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
    • A61F2013/51002—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 with special fibres
    • A61F2013/51038—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 with special fibres being a mixture of fibres
    • A61F2013/51052—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 with special fibres being a mixture of fibres having different diameters
    • 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
    • A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
    • A61F2013/51178—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers with the combination of nonwoven webs
    • 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530131—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 absorbing medium being made in fibre but being not pulp
    • A61F2013/530226—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 absorbing medium being made in fibre but being not pulp with polymeric fibres
    • A61F2013/530299—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 absorbing medium being made in fibre but being not pulp with polymeric fibres being hydrophilic fibres

Definitions

  • the present invention relates to a nonwoven fabric, a sheet for absorbent articles, and an absorbent article including the same. More specifically, the present invention relates to a nonwoven fabric used for an absorbent article, an absorbent article topsheet including the nonwoven fabric, and an absorbent article including the nonwoven fabric.
  • Patent Document 1 is a two-layer nonwoven fabric having a first fiber layer that touches the user's skin and a second fiber layer adjacent to the first fiber layer, and the fibers of the first fiber layer have a smaller specific fiber diameter. (11-18 ⁇ m), the fibers of the second fiber layer have a larger specific fiber diameter (19-31 ⁇ m), and the basis weights of the first fiber layer and the second fiber layer are both specified values (7 A top sheet for absorbent articles made of a non-woven fabric of ⁇ 30 g / m 2 ) is proposed. Patent Document 1 states that since the nonwoven fabric has such characteristics, the texture of the top sheet can be improved and the amount of wet back can be reduced.
  • both the fibers of the first fiber layer and the second fiber layer are hydrophilized, and the fibers of the first fiber layer are more hydrophilic in contact with water than the fibers of the second fiber layer. It will be described that it is preferable that the surface is made hydrophilic so that the degree of conversion tends to decrease, since the amount of wetback can be further reduced.
  • Patent Document 2 is composed of a laminated nonwoven fabric having an upper layer disposed on the skin side and a lower layer disposed on the absorber side, and before liquid permeation, the hydrophilicity of the lower layer is higher than or substantially equal to that of the upper layer.
  • the hydrophilic oil agent used in the upper layer is selected as a hydrophilic oil agent whose water resistance is clearly higher than that of the hydrophilic oil agent used in the lower layer.
  • the liquid permeability is maintained in a stable state when the absorbent article is used, and the surface flow of liquid such as urine and menstrual blood and wetback It can be said that it can be prevented for a long time during use.
  • Patent Document 1 states that it is preferable to hydrophilize a non-woven fabric having a two-layer structure, and that the degree of hydrophilization of the fibers of the first fiber layer is liable to decrease when they come into contact with water.
  • Patent Document 1 does not specifically describe anything about the degree of hydrophilization and its water resistance in the examples, and further does not indicate any properties other than the texture and the wetback amount.
  • the nonwoven fabric and surface sheet of patent document 1 and patent document 2 are distribute
  • the strength of hydrophilicity (degree of hydrophilization), and the strength of hydrophilicity is not easily lowered even when it comes into contact with liquids. In other words, the durability against hydrophilic liquids is different between the upper and lower fiber layers. It is said.
  • the synthetic fibers constituting these fiber layers have strong affinity for liquids (for example, hydrophilicity) and durability when in contact with liquids (contact with liquids). Even if the hydrophilizing agent (also referred to as a fiber treating agent) considering the difficulty of falling off the fiber is attached to the fiber surface, the nonwoven fabric is manufactured.
  • hydrophilizing agent also referred to as a fiber treating agent
  • the non-woven fabric when a non-woven fabric having a two-layer structure is manufactured, the non-woven fabric is manufactured, stored and shipped in the form of a roll. At this time, fibers having different properties are stored in close contact with each other. When the rolled state lasts for a long period of time, if the storage environment is a hot and humid environment, the hydrophilizing agent is mutually connected at the part where different fiber treatment agents are in contact with each other. When the product is moved to an absorbent article, the performance as designed may not be exhibited.
  • the nonwoven fabric has at least a two-layer structure of a first fiber layer and a second fiber layer, and both the first fiber layer and the second fiber layer each have a specific fineness.
  • the fiber diameter of the first fiber layer is smaller than the fiber diameter of the second fiber layer, and both the first fiber layer and the second fiber layer maintain the degree of hydrophilicity even when they come into contact with water.
  • a non-woven fabric having a first fiber layer and a second fiber layer adjacent to the first fiber layer;
  • the fineness of the fibers forming the first fiber layer is 1.0 to 2.8 dtex
  • the fineness of the fibers forming the second fiber layer is 1.7 to 5.6 dtex
  • the fiber diameter of the fibers forming the first fiber layer is smaller than the fiber diameter of the fibers forming the second fiber layer
  • Both the fibers forming the first fiber layer and the fibers forming the second fiber layer are hydrophilized so that the degree of hydrophilicity (degree of hydrophilization) is maintained even when the fibers come into contact with water.
  • the nonwoven fabric for absorbent articles is provided in which the nonwoven fabric is arranged so that the first fiber layer faces human skin.
  • the affinity between the nonwoven fabric surface and water can be expressed by the size of the contact angle formed between the fiber surface constituting the nonwoven fabric and water droplets. That is, if the contact angle is small, the nonwoven fabric and the liquid have high affinity (hydrophilicity), and if the contact angle is large, it can be said that the affinity (hydrophilicity) is low.
  • the durability against a hydrophilic liquid can be expressed by a change in contact angle before and after the liquid is permeated.
  • the present invention provides: A non-woven fabric having a first fiber layer and a second fiber layer adjacent to the first fiber layer;
  • the fineness of the fibers forming the first fiber layer is 1.0 to 2.8 dtex,
  • the fineness of the fibers forming the second fiber layer is 1.7 to 5.6 dtex,
  • the fiber diameter of the fibers forming the first fiber layer is smaller than the fiber diameter of the fibers forming the second fiber layer,
  • Contact angle (A1) of ion-exchanged water with respect to the surface of the fiber forming the first fiber layer before contact with water, and contact angle of ion-exchanged water with respect to the surface of the fiber forming the second fiber layer before contacting with water ( A2) satisfies the following (I), (I): A1 ⁇ 80 °, A2 ⁇ 80 °,
  • the present invention Since the present invention has the characteristics as described above, it is selected from texture, wetback amount, liquid absorption time, diffusion length, repeated durability (wetback amount, liquid absorption time and diffusion length), storage stability, and the like. At least one is improved. More preferably, at least one selected from the repetition durability of the wetback amount, the liquid absorption time, and the diffusion length is improved.
  • FIG. 1 schematically shows a contact angle formed between a water droplet and a fiber (surface).
  • FIG. 2 schematically shows a stainless steel plate for attaching water droplets to a nonwoven fabric sample in order to measure the contact angle after water permeation.
  • the present invention provides a nonwoven fabric for absorbent articles.
  • Absorbent articles generally include a liquid-retaining absorbent body, a liquid-impermeable back sheet, and a liquid-permeable top sheet, and the back sheet is disposed between the absorbent body and the top sheet.
  • the nonwoven fabric for absorbent articles which concerns on embodiment of this invention is arrange
  • the back sheet and the absorbent body those usually used for absorbent articles can be used.
  • a film of a thermoplastic resin with or without moisture permeability can be used as the back sheet.
  • an absorbent body in which pulp fibers, superabsorbent polymer particles or a mixture thereof is wrapped or sandwiched with paper such as tissue paper can be used as the absorbent body.
  • Nonwoven fabric for absorbent articles in the form of the present invention A non-woven fabric having at least two layers having a first fiber layer and a second fiber layer adjacent to the first fiber layer;
  • the fineness of the fibers forming the first fiber layer is 1.0 to 2.8 dtex
  • the fineness of the fibers forming the second fiber layer is 1.7 to 5.6 dtex
  • the fiber diameter of the fibers forming the first fiber layer is smaller than the fiber diameter of the fibers forming the second fiber layer
  • Both the fibers forming the first fiber layer and the fibers forming the second fiber layer have a hydrophilic property that maintains the degree of their hydrophilicity even when the fibers come into contact with water. , Their hydrophilicity is the same,
  • a nonwoven fabric is arrange
  • the nonwoven fabric for absorbent articles in the form of the present invention has a hydrophilic strength that is easy to adapt to a liquid containing water on the fiber surface constituting the nonwoven fabric, and is hydrophilic even when contacted with such a liquid. It is also possible to describe the property that is not easily lowered by using the contact angle between the fiber surface and water as follows.
  • Nonwoven fabric for absorbent articles in the form of the present invention A non-woven fabric having a first fiber layer and a second fiber layer adjacent to the first fiber layer;
  • the fineness of the fibers forming the first fiber layer is 1.0 to 2.8 dtex,
  • the fineness of the fibers forming the second fiber layer is 1.7 to 5.6 dtex,
  • the fiber diameter of the fibers forming the first fiber layer is smaller than the fiber diameter of the fibers forming the second fiber layer
  • Contact angle (A1) of ion-exchanged water with respect to the surface of the fiber forming the first fiber layer before contact with water, and contact angle of ion-exchanged water with respect to the surface of the fiber forming the second fiber layer before contacting with water ( A2) satisfies the following (I), (I): A1 ⁇ 80 °, A2 ⁇ 80 °,
  • the fineness of the fibers forming the first fiber layer is 1.0 to 2.8 dtex, preferably 1.5 to 2.6 dtex, and more preferably 1.7 to 2.3 dtex.
  • the fineness of the fibers forming the second fiber layer is 1.7 to 5.6 dtex, preferably 2.0 to 5.0 dtex, more preferably 2.6 to 4.0 dtex.
  • the fiber diameter of the fibers forming the first fiber layer is smaller than the fiber diameter of the fibers forming the second fiber layer. Therefore, in this invention, a thinner fiber is used for the 1st fiber layer facing human skin, and a fiber thicker than the 1st fiber layer is used for the 2nd fiber layer facing an absorber. Since the fibers of the first fiber layer facing the human skin have a specific fineness finer than the fibers of the second fiber layer, the texture and feel are preferred.
  • the first fiber layer and the second fiber layer preferably all of the fibers forming them have a fiber fineness in the above range, but within the range not impairing the desired effect of the present invention, the fibers outside the above range. May be included.
  • the fiber diameter of the fibers forming the first fiber layer is preferably 10 to 20 ⁇ m, more preferably 12 to 19 ⁇ m, and still more preferably 14 to 18 ⁇ m.
  • the fiber diameter of the fibers forming the second fiber layer is preferably 13 to 28 ⁇ m, more preferably 15 to 26 ⁇ m, still more preferably 17 to 24 ⁇ m, and even more preferably 17 to 21 ⁇ m.
  • the fiber (raw material or material) of the first fiber layer is not particularly limited as long as the desired nonwoven fabric can be obtained.
  • the fibers of the first fiber layer can include, for example, the following fibers: natural fibers such as cotton, silk, and wool; viscose rayon, cupra, and solvent-spun cellulose fibers (eg, Lenzungryocell® and Recycled fibers such as Tencel (registered trademark); polyolefin fibers, polyester fibers, polyamide fibers, (poly) acrylic fibers made of acrylonitrile, polycarbonate fibers, polyacetal fibers, polystyrene fibers, and cyclic polyolefin fibers Synthetic fibers such as fibers.
  • natural fibers such as cotton, silk, and wool
  • viscose rayon, cupra, and solvent-spun cellulose fibers eg, Lenzungryocell® and Recycled fibers such as Tencel (registered trademark)
  • polyolefin fibers polyester fibers
  • the fibers of the first fiber layer are not only fibers made of a single type of resin, but also composite fibers made of two or more types of resins (for example, concentric or eccentric core-sheath type composite fibers, sea-island type composite fibers) , Side-by-side type composite fibers) can also be used.
  • the fineness or fiber diameter can be calculated according to the method according to JIS L 1019 7.4.1 Micro Ney.
  • the fibers of the first fiber layer synthetic fibers are preferable, and polyester fibers, polyolefin fibers, and combinations thereof are more preferable.
  • the fibers of the first fiber layer can contain regenerated fibers and / or natural fibers in the synthetic fibers as long as the nonwoven fabric intended by the present invention can be obtained.
  • the fibers of the first fiber layer are, for example, polyester fibers such as polyethylene terephthalate; and polyethylene (high density polyethylene, low density polyethylene, linear low density polyethylene), polypropylene, ethylene-propylene copolymer, ethylene-butene Polyolefin fibers such as a -1-propylene terpolymer; and a combination thereof.
  • the polyethylene is high-density polyethylene because crimps can be easily imparted.
  • a fiber treating agent can be used to impart hydrophilicity to the fiber.
  • the need for the fiber treatment agent to contain an additional component for imparting water repellency can be reduced, and an unnecessary influence on the liquid absorption characteristics can be suppressed.
  • the form of the combination such as a simple mixed fiber of each fiber, a concentric or eccentric core-sheath type composite fiber, etc., is not particularly limited as long as the desired nonwoven fabric can be obtained. Absent. A concentric or eccentric core-sheath type composite fiber is preferable, and a concentric core-sheath type composite fiber is more preferable because the thickness of the first fiber layer can be reduced. The thinner the non-woven fabric, the shorter the distance to the absorbent body, the better the mobility of the liquid, and the better the absorption time and the amount of wet back, so the first fiber layer is also thinner. Is preferred.
  • a concentric or eccentric core-sheath type composite fiber composed of a polyester resin and a polyolefin resin is even more preferable.
  • a core-sheath type composite fiber in which the core component is a polyester resin and the sheath component is a polyolefin resin is preferable.
  • the fibers of the first fiber layer preferably contain 50% by mass or more, more preferably 70% by mass or more of concentric core-sheath type composite fibers, and all the fibers forming the first fiber layer are concentric core-sheath type composite fibers.
  • a fiber is particularly preferred.
  • the fibers of the first fiber layer can contain an additive such as titanium oxide in the fibers in order to improve the texture and feel.
  • Such an additive is preferably contained in an amount of 0.1 to 10% by mass, more preferably 1 to 5% by mass, based on 100% by mass of the entire fiber including the additive.
  • the fiber of a 1st fiber layer is a core-sheath-type composite fiber
  • a manufacturing apparatus such as a nonwoven fabric may be damaged.
  • the composite ratio of the core component to the sheath component is preferably 80:20 to 40:60, more preferably 70:30 to 50:50, and 65: More preferably, it is 35 to 55:45.
  • the composite ratio is within this range, particularly when the core component is larger in the composite ratio (mass ratio), it is preferable because unevenness of the fabric weight and formation of the nonwoven fabric can be reduced.
  • the fiber (raw material or material) of the second fiber layer is not particularly limited as long as the objective nonwoven fabric can be obtained.
  • the fibers of the second fiber layer can include, for example, the following fibers: natural fibers such as cotton, silk, and wool; viscose rayon, cupra, and solvent-spun cellulose fibers (eg, Lenzungryocell® and Recycled fibers such as Tencel (registered trademark); polyolefin fibers, polyester fibers, polyamide fibers, (poly) acrylic fibers made of acrylonitrile, polycarbonate fibers, polyacetal fibers, polystyrene fibers, and cyclic polyolefin fibers Synthetic fibers such as fibers.
  • natural fibers such as cotton, silk, and wool
  • viscose rayon, cupra, and solvent-spun cellulose fibers eg, Lenzungryocell® and Recycled fibers such as Tencel (registered trademark)
  • polyolefin fibers polyester fibers
  • the fibers of the second fiber layer are not only fibers made of a single type of resin, but also composite fibers made of two or more types of resins (for example, concentric or eccentric core-sheath type composite fibers, sea-island type composite fibers) , Side-by-side type composite fibers) can also be used.
  • the fineness or fiber diameter can be calculated according to the method according to JIS L 1019 7.4.1 Micro Ney.
  • the fibers of the second fiber layer are preferable, and polyester fibers, polyolefin fibers, and combinations thereof are more preferable.
  • the fibers of the second fiber layer can contain regenerated fibers and / or natural fibers in the synthetic fibers as long as the nonwoven fabric intended by the present invention can be obtained.
  • the fibers of the second fiber layer are, for example, polyester fibers such as polyethylene terephthalate; and polyethylene (high density polyethylene, low density polyethylene, linear low density polyethylene), polypropylene, ethylene-propylene copolymer, ethylene-butene Polyolefin fibers such as a -1-propylene terpolymer; and a combination thereof.
  • the polyethylene is high-density polyethylene because crimps can be easily imparted.
  • a fiber treating agent can be used to impart hydrophilicity to the fiber.
  • the need for the fiber treatment agent to contain an additional component for imparting water repellency can be reduced, and an unnecessary influence on the liquid absorption characteristics can be suppressed.
  • the form of the combination such as a simple mixed fiber of each fiber, a concentric or eccentric core-sheath type composite fiber, etc., is not particularly limited as long as the desired nonwoven fabric can be obtained. Absent. A concentric or eccentric core-sheath type composite fiber is preferable, and a concentric core-sheath type composite fiber is more preferable because the thickness of the second fiber layer can be reduced. The thinner the non-woven fabric, the shorter the distance to the absorbent body, so the liquid mobility is better, and the liquid absorption time and wetback amount can be improved, so the second fiber layer is also thinner. Is preferred.
  • a concentric or eccentric core-sheath type composite fiber composed of a polyester resin and a polyolefin resin is even more preferable.
  • a core-sheath type composite fiber in which the core component is a polyester resin and the sheath component is a polyolefin resin is preferable.
  • the fibers of the second fiber layer preferably contain 50% by mass or more of concentric core-sheath type composite fibers, more preferably contain 70% by mass or more, and all the fibers forming the second fiber layer are concentric core-sheath type composite fibers.
  • a fiber is particularly preferred.
  • the fibers of the second fiber layer can contain an additive such as titanium oxide in the fibers in order to improve the texture and feel. Such an additive is preferably contained in an amount of 0.1 to 10% by mass, more preferably 1 to 5% by mass, based on 100% by mass of the entire fiber including the additive of the second fiber layer.
  • the fiber of a 2nd fiber layer is a core-sheath-type composite fiber
  • a manufacturing apparatus such as a nonwoven fabric may be damaged.
  • the composite ratio of the core component to the sheath component is preferably 80:20 to 40:60, more preferably 70:30 to 50:50, and 65: More preferably, it is 35 to 55:45.
  • the composite ratio is within this range, particularly when the core component is larger in the composite ratio (mass ratio), the fabric weight and the unevenness of the nonwoven fabric can be reduced, which is more preferable.
  • the basis weight of the whole nonwoven fabric is preferably 10 to 80 g / m 2 , more preferably 15 to 50 g / m 2 , and further preferably 17 to 40 g / m 2 .
  • the overall weight of the nonwoven fabric may be as low as possible in terms of cost.
  • the basis weight is preferably 10 to 50 g / m 2 , and more preferably 15 to 40 g / m 2 .
  • the thickness of the nonwoven fabric is preferably 0.2 to 3.0 mm, more preferably 0.3 to 1.5 mm, and still more preferably 0.35 to 0.8 mm.
  • the thickness of the nonwoven fabric may be as low as possible in view of cost.
  • the thickness is preferably 0.2 to 1.0 mm, and preferably 0.3 to 0.8 mm. More preferred.
  • the basis weight of the first fiber layer is preferably 3 to 40 g / m 2 , and more preferably 5 to 15 g / m 2 .
  • the basis weight of the second fiber layer is preferably 3 to 40 g / m 2 , more preferably 8 to 20 g / m 2 .
  • the ratio of the basis weight of the second fiber layer to the basis weight of the first fiber layer is preferably 0.8 to 3.0, and preferably 1.0 to 2 Is more preferably 0.0, more preferably 1.3 to 1.7.
  • the basis weight of the first fiber layer having a smaller fiber diameter is smaller than the basis weight of the second fiber layer, that is, the ratio between the basis weight of the second fiber layer and the basis weight of the first fiber layer (the basis weight of the second fiber layer /
  • the basis weight of the first fiber layer is larger than 1, it is more preferable because better liquid absorption characteristics can be obtained while having a texture and touch.
  • Both the fibers forming the first fiber layer and the fibers forming the second fiber layer are provided with hydrophilicity that maintains the degree of hydrophilicity (degree of hydrophilization) even when in contact with water. (That is, the fiber is hydrophilic with water resistance).
  • the “hydrophilicity that maintains the degree of hydrophilicity even when contacted with water” is preferably a water resistance index of 15 or less obtained by the following method for measuring a water resistance index. More preferably, it is more preferably 10 or less. The smaller the water resistance index, the higher the hydrophilic water resistance. When the water resistance index is 15 or less, repeated liquid absorption characteristics (durability of liquid absorption characteristics), in particular, repeated wetback characteristics (durability of wetback) become better and more preferable.
  • “Hydrophilicity that maintains the degree of hydrophilicity even when contacted with water” means “first liquid absorption time (seconds)” obtained by the same method as the calculation of the water resistance index and “ The value of the ratio of the third liquid absorption time (seconds) to the first liquid absorption time (seconds) (third liquid absorption time (seconds) / first time liquid absorption time (seconds) " You may represent by liquid absorption time (second).
  • the value of such a ratio is preferably 30 or less, more preferably 20 or less, and particularly preferably 15 or less. When the value of such a ratio is 30 or less, repeated liquid absorption characteristics (durability of liquid absorption characteristics), particularly repeated wetback characteristics (durability of wetback) become better and more preferable.
  • the hydrophilic water resistance (water resistance index) of the fiber treatment agent is evaluated as follows.
  • Concentric core-sheath type composite fiber fineness: 2.0 dtex, fiber length) in which polyethylene terephthalate is the core, high-density polyethylene is the sheath, and the composite ratio (core / sheath, mass ratio) is 60/40 : 45 mm) (for example, NBF (registered trademark) product number (SH) manufactured by Daiwabo Polytech Co., Ltd.) 0.40% by mass of the fiber treatment agent is applied, and the parallel card method and the air-through method (heating temperature: 135 ° C., treatment time: A non-woven fabric sample (weight per unit: 20.0 g / m 2 , dimensions: length 10.0 cm ⁇ width 10.0 cm, thickness: 1.2 mm) was produced using 10 seconds, wind speed: 1.0 m / s).
  • the liquid absorption time of the nonwoven fabric sample was measured by the following method.
  • the “degree of hydrophilic height” when wetted by the fibers of the first fiber layer and the fibers of the second fiber layer is particularly limited as long as the nonwoven fabric for absorbent articles intended by the present invention can be obtained. There is no.
  • the degree of hydrophilicity when wet is evaluated by the following run-off evaluation method, and the sum total of run-off times 2 to 5 is preferably 9.0 to 30, more preferably 9.5 to 20, particularly preferably 10.0 to 15.
  • the sum of runoffs 2 to 5 is 9.0 to 30, repeated liquid absorption characteristics, particularly repeated wetback characteristics are improved, which is more preferable.
  • the “degree of hydrophilicity” is a value (runoff index) obtained by the following formula for the runoff values of the first to fifth times obtained by the same method as the calculation of the sum total of the second and fifth runoffs. It may be expressed as A value (runoff index) obtained by such a formula is preferably 13.7 to 55, more preferably 14.0 to 40, and particularly preferably 14.5 to 30. When the value (runoff index) obtained by such a formula is 13.7 to 55, the repeated liquid absorption characteristics, particularly the repeated wetback characteristics, are more preferable and more preferable.
  • the degree of hydrophilicity of the fiber treatment agent was evaluated by measuring runoff as follows. Concentric core-sheath type composite fiber (fineness: 2.0 dtex, fiber length: 45 mm) in which polyethylene terephthalate is the core, high-density polyethylene is the sheath, and the composite ratio (core / sheath, mass ratio) is 60/40 (For example, Daiwabo Polytech Co., Ltd.
  • NBF registered trademark product number (SH)
  • SH product number
  • a triangular prism having a substantially right-angled isosceles triangular bottom surface was laid down to prepare a support base whose slope has an angle of 45 degrees with the horizontal plane.
  • Two filter papers (trade name Lister Paper (Grade 989, 27.5 cm ⁇ 14 cm) manufactured by MEZGER Inc.) were laid on the slope, and a nonwoven fabric sample was placed thereon and fixed.
  • physiological saline colored with blue dye
  • All the physiological saline was absorbed by the nonwoven fabric, and the position of the tip of the physiological saline was measured when the saline water droplets disappeared from the nonwoven fabric surface. The distance between the position and the position where the physiological saline was dropped on the nonwoven fabric surface, that is, the longest distance that the physiological water droplets flowed on the nonwoven fabric surface was determined.
  • the second run-off use the non-woven fabric sample used for the first run-off, 30 seconds after the end of the first run-off measurement, and the same position as the first time at the position where the physiological saline was dropped first time. Then, physiological saline was dropped, and the distance that the physiological saline flowed on the nonwoven fabric surface was determined. The third and subsequent runoffs were measured repeatedly using the previous nonwoven fabric sample.
  • the fibers forming the second fiber layer are given substantially the same hydrophilicity as the fibers forming the first fiber layer. Since the fibers of the first fiber layer and the fibers of the second fiber layer have such hydrophilicity, they are selected from repeated liquid absorption characteristics, more specifically, wetback amount, liquid absorption time and diffusion length. At least one kind of repeated durability can be further improved. Further, since the fibers forming the first fiber layer and the fibers forming the second fiber layer have substantially the same hydrophilicity, the hydrophilicity of the first fiber layer and the second fiber layer is mixed. This is preferable because the liquid absorption characteristics do not change.
  • each of the first fiber layer and the second fiber layer has a degree of hydrophilicity (degree of hydrophilicity or strength of hydrophilicity), and each fiber layer is configured.
  • the hydrophilic water resistance water resistance index or hydrophilic durability of each fiber layer when each fiber layer comes into contact with water indicated by the fiber treatment agent applied to the surface of the fiber It can be expressed by using the angle (contact angle) between the surface and the surface of the water droplet attached thereon. The contact angle is measured by the method described later.
  • the nonwoven fabric for absorbent articles in the form of the present invention is Contact angle (A1) of ion-exchanged water with respect to the surface of the fiber forming the first fiber layer before contact with water, and contact angle of ion-exchanged water with respect to the surface of the fiber forming the second fiber layer before contacting with water ( A2) satisfies the following (I), (I): A1 ⁇ 80 °, A2 ⁇ 80 °,
  • Contact angle (B1) of ion-exchanged water with respect to the surface of the fiber forming the first fiber layer after contact with water, and contact angle of ion-exchanged water with respect to the surface of the fiber forming the second fiber layer after contact with water ( B2) satisfies the following (II).
  • the contact angle (A1) of ion-exchanged water with respect to the surface of the fibers forming the first fiber layer before contact with water (before liquid permeation) and the second fiber layer are formed.
  • the contact angle (A2) of ion-exchanged water with respect to the fiber surface will be described.
  • A1 and A2 are sprayed with ion exchange water of about 20 ° C. on the surface of the fiber forming each fiber layer, so that fine water droplets of the sprayed ion exchange water adhere to the fiber surface, and the surface of the droplet The angle between the fiber surface and the fiber surface.
  • A1 and A2 are hydrophilicity on the surface of the fiber layer before receiving liquid discharged from a wearer (including humans and mammals) of absorbent articles such as urine and menstrual blood in the nonwoven fabric for absorbent articles according to the present invention. High or low sex.
  • both A1 and A2 are 80 ° or less (A1 ⁇ 80 °, A2 ⁇ 80 °). Since both A1 and A2 are 80 ° or less, both the hydrophilicity of the first fiber layer and the hydrophilicity of the second fiber layer are sufficiently high, and when urine, menstrual blood, loose stool, etc. are discharged and come into contact with the nonwoven fabric The water and fibers contained in these liquids and discharges are easily mixed with each other, and the non-woven fabric easily absorbs these liquids and water instantly.
  • Both A1 and A2 are preferably 20 ° or more and 80 ° or less, more preferably 30 ° or more and 75 ° or less, particularly preferably 35 ° or more and 75 ° or less, and 40 ° or more and 70 °. Most preferably:
  • the first fiber layer and the second fiber layer have the same degree of hydrophilicity (degree of hydrophilicity). Therefore, in the nonwoven fabric for absorbent articles of the present invention, the absolute value of the difference between A1 and A2 is less than 12 (
  • the hydrophilic strength of the fiber treatment agent treated with the fibers constituting the first fiber layer is the same as the hydrophilic strength of the fiber treatment agent treated with the fibers constituting the second fiber layer.
  • One layer is extremely hydrophilic compared to the other layer, and it is difficult for a liquid such as urine and menstrual blood to be easily retained.
  • the absolute value of the difference between A1 and A2 is preferably 10 or less, more preferably 8 or less, and particularly preferably 6 or less.
  • the contact angle (B2) of ion-exchanged water with respect to the surface of the fiber that forms the subsequent second fiber layer will be described.
  • B1 and B2 are about 20 ° C. ion-exchanged water on the surface of the non-woven fabric where the ion-exchanged water was allowed to pass after 0.04 ml of about 20 ° C. ion-exchanged water was allowed to pass through the non-woven fabric.
  • B1 and B2 are not particularly limited as long as the nonwoven fabric for absorbent articles in the form of the present invention can be obtained, but it is preferably less than 90 °. When B1 and B2 are less than 90 °, the hydrophilicity of the first fiber layer and the second fiber layer is maintained to some extent, and even when urine and menstrual blood are repeatedly discharged, they can be sufficiently absorbed.
  • B1 and B2 are more preferably 30 ° or more and 85 ° or less, particularly preferably 40 ° or more and 80 ° or less, and most preferably 45 ° or more and 80 ° or less.
  • the absolute value of the difference between B1 and B2 is not particularly limited as long as the nonwoven fabric for absorbent articles in the form of the present invention can be obtained, but it is preferably less than 14.
  • the absolute value of the difference between B1 and B2 is less than 14, the hydrophilicity exerted by the surface of the fibers forming each of the first fiber layer and the second fiber layer after contact with water (after liquid permeation) Means the same level.
  • the first fiber layer and the second fiber layer have the same level of hydrophilicity (degree of hydrophilicity), and the compatibility with urine and menstrual blood is the same even after passing these liquids,
  • One layer is extremely hydrophilic compared to the other layer, and it is difficult for a liquid such as urine and menstrual blood to be easily retained.
  • the absolute value of the difference between B1 and B2 is more preferably 12 or less, particularly preferably 10 or less, and most preferably 8 or less.
  • the contact angles (A1, A2) before contact with water and the contact angles (B1 and B2) after contact with water ⁇ 5 ⁇ (B1-A1) ⁇ 40 °, ⁇ 5 ⁇ (B2-A2) ⁇ 40 °
  • B1-A1 and B2-A2 are within the above range, the hydrophilic durability of the fiber surface forming the first fiber layer and the second fiber layer, that is, the water of the fiber treatment agent imparted to the fiber surface
  • it may be a fiber treating agent that has moderate durability against water (eg, water contained in urine or menstrual fluid, soft stool, etc.) and gradually elutes into water.
  • the fiber layer provided with such a fiber treatment agent maintains the degree of hydrophilicity capable of absorbing and passing water multiple times, but since the degree of hydrophilicity gradually decreases, each fiber layer continues to retain water. It is considered that the amount of liquid return (so-called wet back) in which the liquid remaining in the fiber layer returns to the nonwoven fabric surface can be suppressed.
  • the fiber layer after contact with water has a too high degree of hydrophilicity and a large change in the degree of hydrophilicity. Can increase.
  • B1-A1 and B2-A2 are 40 ° or more, that is, when the degree of hydrophilicity is greatly reduced by contact with water, this fiber layer is a fiber whose degree of hydrophilicity tends to decrease upon contact with water. In addition to being present, the fiber layer after contact with water has a low degree of hydrophilicity.
  • B1-A1 and B2-A2 are preferably from ⁇ 3 ° to 35 °, more preferably from 0 ° to 30 °, particularly preferably from 3 ° to 25 °. Most preferably, it is 20 ° or less.
  • A2) is preferably comparable. That is, the absolute value (
  • the degree of hydrophilization by the fiber treatment agent can be reduced to the same extent by contact with water. After contact with water, the degree of hydrophilicity (affinity to liquid) of either the first fiber layer or the second fiber layer does not occur extremely high or extremely low, so that the liquid return amount is further increased. It is thought that it tends to decrease.
  • the absolute value of the difference between B1 ⁇ A1 and B2 ⁇ A2 ((B1 ⁇ A1) ⁇ (B2 ⁇ A2)) is more preferably 15 or less, particularly preferably 12 or less, and preferably 10 or less. And most preferred.
  • the contact angle of water on the fiber surface forming the first fiber layer and the contact angle of water on the fiber surface forming the second fiber layer are such that ion exchange water is sprayed on the surface of each fiber layer to form each fiber layer.
  • the angle between the fiber surface and the surface of the water droplet is measured.
  • the contact angle between water and the fiber surface can be measured by the following method.
  • a non-woven fabric containing fibers that are objects of contact angle measurement is cut so that the length (MD direction) ⁇ width (CD direction) is 50 mm ⁇ 10 mm, and a measurement sample is prepared. With the measurement surface of the measurement sample facing upward, test the measurement sample so that the CD direction of the nonwoven fabric is perpendicular to the lens surface of the zoom lens (that is, the observation direction is parallel to the CD direction). Place it on the table and fix both ends with tape.
  • the observation direction (the direction in which the object is viewed through the zoom lens) is not particularly limited as long as the fiber is selected so as to extend in a direction orthogonal to the observation direction.
  • the viewing direction may be a direction that forms an angle of 45 ° with the CD direction of the nonwoven fabric, for example.
  • water droplets of ion-exchanged water (water temperature of about 20 ° C.) are sprayed on the measurement sample using a spray that makes the mist size as constant and fine as possible.
  • a water droplet placed on the fiber surface is observed with a zoom lens at 50 to 1000 times according to the fiber diameter of the fiber to be observed, and an image is captured.
  • Spraying and image capture are repeated to obtain 20 images with clear water droplets. From the obtained images, select an image in which the fibers are horizontal. This is because the contact angle changes when the fiber is tilted. When the number of selected images is 10 or more, the contact angle is obtained using these images. If the number of images in which the fibers are leveled is less than 10, obtain 20 more images and select the image in which the fibers are leveled from among them. Repeat until the total number of images is 10 or more.
  • the contact angle is an angle formed by drawing a tangent line to the water drop at a position where the surface of the water drop that comes into contact with the air and the fiber makes contact with the fiber.
  • the contact angle is measured by image analysis processing software (for example, two-dimensional image analysis software “MicroMeasure” available from SCARA Co., Ltd.) or a protractor.
  • the contact angle is measured in each of the selected images, and the average value (arithmetic average value) of them is obtained to obtain the contact angle of the fiber to be measured.
  • the contact angle may be measured by a method in which a target constituent fiber is taken out from the measurement surface and water droplets are sprayed on the constituent fiber without measuring using a nonwoven fabric.
  • the “contact angle” is obtained in consideration of the movement situation. Less than 40% of the total number of measurements (total number of measurement points where shooting of water droplets was attempted, total when water droplets moved during shooting and when they did not move) before reaching 20 contact angle measurement points.
  • 10 or more images in which the fibers are horizontal are selected and the measured values are averaged to obtain the contact angle. If the water droplets move at 40% or more of the total number of measurements before the contact angle is measured at 20 points, the contact angle is 20 ° or less.
  • the nonwoven fabric is cut into a size of 22 cm in the vertical direction and 5 cm in the horizontal direction to produce a measurement sample.
  • a stainless plate shown in FIG. 2 in which holes with a diameter of 15 mm are formed at equal intervals (the distance between the centers of the holes is 20 mm) is prepared. Mark with 4 oily magic pens in the hole of the plate. Place the plate on the measurement surface of the measurement sample. While placing the stainless steel plate on the measurement sample, 0.04 ml of ion-exchanged water adjusted to about 20 ° C. is applied to the measurement surface of the measurement sample located at the center of the hole provided in the stainless steel plate, Drip using a burette.
  • the ion exchange water of the measurement sample is absorbed. After the dropped water droplets disappear from the surface of the measurement sample, the measurement sample is dried in an atmosphere of 20 to 50 ° C. In addition, when the water droplet is absorbed after the water droplet is dropped on the measurement sample, the portion where the water droplet remains is sucked and the water is forcibly absorbed by the lower layer (second fiber layer, if any). Also good.
  • the dried measurement sample is cut along a straight line passing through points 1 and 2 in the hole of the stainless steel plate shown in FIG. From the cut surface of the measurement sample corresponding to the location where ion exchange water is dropped, ion exchange water of about 20 ° C. is sprayed by the above-described spraying, and water droplets are attached to the fibers of the measurement sample.
  • the contact angle after water permeation is measured by observing water droplets on the fibers of the measurement sample by the same method as the method for measuring the contact angle before liquid permeation.
  • Both the first fiber layer and the second fiber layer are preferably treated with the same fiber treating agent to impart substantially the same degree of hydrophilicity. Even if the fiber treatment agent comes into contact with water, it can maintain the same level of hydrophilicity when wet, and preferably has the same level of hydrophilic water resistance.
  • fiber treating agents include polyglycerin fatty acid esters, polyether-polyester block copolymers, polyether-modified silicones, and fatty acid esters of ethylene oxide-added polyhydric alcohols, even if they come into contact with water.
  • examples thereof include substances that do not easily leave the surface.
  • the treatment of the fiber using the fiber treatment agent may be performed either before or after the fiber forms the fiber layer.
  • the fiber treatment agent described above is attached to the fibers of the first fiber layer and the second fiber layer in an amount of 0.1 to 1.5% by mass with 100% by mass of the entire fiber containing the fiber treatment agent and the like. It is preferable that 0.2 to 1.0% by mass is adhered, and 0.25 to 0.8% by mass is more preferable. It is preferable that a predetermined amount of the fiber treatment agent adheres to the fibers because desired liquid absorption characteristics, particularly wetback characteristics, become better.
  • the first fiber layer and the second fiber layer used in the present invention can be manufactured using various fiber web manufacturing methods.
  • the production method is not particularly limited.
  • a production method for example, a card method such as a parallel web, a cross web, a Chris cross web, a semi-random web and a random web, an air lay method and the like can be exemplified.
  • the nonwoven fabric for absorbent articles in the form of the present invention can be manufactured by superimposing and integrating the first fiber web and the second fiber web.
  • the production method is not particularly limited.
  • a manufacturing method for example, an air through method (hot air penetration heat treatment method), a hot air spraying heat treatment method, a heat roll method, an infrared heat treatment method, a needle punch method and the like can be exemplified.
  • the fibers of the first and second fiber layers of the integrated nonwoven fabric may be bonded together.
  • the nonwoven fabric for absorbent articles in the form of the present invention can further have an additional layer that the nonwoven fabric normally has, if necessary.
  • the nonwoven fabric for absorbent articles in the form of the present invention may be subjected to additional processing such as embossing as necessary, and may have such additional form and shape.
  • the nonwoven fabric for absorbent articles in the form of the present invention preferably has a strength at 10% elongation in the MD direction (machine direction) of 3.5 N / 5 cm or more, more preferably 6.0 N / 5 cm or more, It is still more preferably 8.5 N / 5 cm or more, and even more preferably 10.0 N / 5 cm or more.
  • the strength at 20% elongation in the MD direction is preferably 8.0 N / 5 cm or more, more preferably 10.0 N / 5 cm or more, still more preferably 13.0 N / 5 cm or more, 15 It is still more preferable that it is 0.0 N / 5 cm or more, and it is especially preferable that it is 18.0 N / 5 cm or more.
  • the strength at 10% elongation in the MD direction is preferably 30.0 N / 5 cm or less, preferably 25.0 N / 5 cm or less, and 20.0 N / More preferably, it is 5 cm or less.
  • the strength is measured according to JIS L 1096 6.12.1 A method (strip method).
  • the nonwoven fabric for absorbent articles in the form of the present invention can be used for various absorbent articles such as disposable diapers, sanitary napkins, incontinence pads and panty liners. Furthermore, this invention can provide various absorbent articles containing such a nonwoven fabric for absorbent articles.
  • Fiber 1 Polyethylene terephthalate is the core, high-density polyethylene is the sheath, the composite ratio (core / sheath, mass ratio) is 60/40, the fineness is 2.0 dtex (fiber diameter 15 ⁇ m), and the fiber length is 45 mm.
  • Core-sheath type composite fiber (trade name NBF (registered trademark) product number (SH) manufactured by Daiwabo Polytech Co., Ltd.)
  • Fiber 2 Polyethylene terephthalate is the core, high-density polyethylene is the sheath, the composite ratio (core / sheath, mass ratio) is 60/40, the fineness is 3.3 dtex (fiber diameter: 19 ⁇ m), and the fiber length is 51 mm.
  • Core-sheath type composite fiber (trade name NBF (registered trademark) product number (SH) manufactured by Daiwabo Polytech Co., Ltd.)
  • Fiber 3 Polyethylene terephthalate is the core, high-density polyethylene is the sheath, the composite ratio (core / sheath, mass ratio) is 60/40, the fineness is 4.4 dtex (fiber diameter 22 ⁇ m), and the fiber length is 51 mm.
  • Core-sheath type composite fiber (trade name NBF (registered trademark) product number (SH) manufactured by Daiwabo Polytech Co., Ltd.)
  • Fiber treatment agent hydrophilizing agent used for producing the nonwoven fabrics of Examples and Comparative Examples is shown below.
  • the hydrophilicity and durability of the fiber treatment agent were evaluated as follows. In addition, about 0.40 mass% is given to the fiber treatment agent by making the whole fiber containing a fiber treatment agent etc. into a mass 100%.
  • Fiber treatment agent A Water-resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt and having water resistance
  • Fiber treatment agent B C12 alkyl phosphate ester potassium salt is included and has higher water resistance than fiber treatment agent A
  • Fiber treatment agent D C12 alkyl phosphate ester Hydrophilic fiber treatment agent that contains potassium salt and does not have water resistance
  • Concentric core-sheath type composite fiber (fineness: 2.0 dtex, fiber length: 45 mm) in which polyethylene terephthalate is the core, high-density polyethylene is the sheath, and the composite ratio (core / sheath, mass ratio) is 60/40 0.40% by mass of a fiber treatment agent is applied to (Niwa (registered trademark) product number (SH) manufactured by Daiwabo Polytech Co., Ltd.), and the parallel card method and the air-through method (heating temperature: 135 ° C., treatment time: 10 seconds, wind speed: 1.0 m / s) was used to prepare and prepare a nonwoven fabric sample (weight per unit: 20.0 g / m 2 , dimensions: 18.0 cm x 7.0 cm, thickness: 0.70 mm).
  • Niwa registered trademark product number
  • a triangular prism having a substantially right-angled isosceles triangular bottom surface was laid down to prepare a support base whose slope has an angle of 45 degrees with the horizontal plane.
  • Two filter papers (trade name Lister Paper (Grade 989, 27.5 cm ⁇ 14 cm) manufactured by MEZGER Inc.) were laid on the slope, and a nonwoven fabric sample was placed thereon and fixed.
  • physiological saline colored with blue dye
  • All the physiological saline was absorbed by the nonwoven fabric, and the position of the tip of the physiological saline was measured when the saline water droplets disappeared from the nonwoven fabric surface. The distance between the position and the position where the physiological saline was dropped on the nonwoven fabric surface, that is, the longest distance that the physiological water droplets flowed on the nonwoven fabric surface was determined.
  • the second run-off uses the nonwoven fabric sample used for the first run-off, 30 seconds after the end of the first run-off measurement, and the same position as the first time at the position where the physiological saline was dropped first time. Then, physiological saline was dropped, and the distance that the physiological saline flowed on the nonwoven fabric surface was determined.
  • the third and subsequent runoffs were measured repeatedly using the previous nonwoven fabric sample. The results are shown in Table 1. It is considered that the hydrophilicity at the time of wetting increases in the order of the fiber treatment agents D, A, B, and C.
  • Fiber treatment agent A 19.5 Fiber treatment agent B: 14.9 Fiber treatment agent C: 13.6 Textile treatment agent D: 61.4
  • Plate with injection cylinder use Strike-through plate described in NWSP 070.3.R0 (15) of EDANA Nonwovens Standard Procedures-Edition 2015) 0.90% physiological saline (colored with blue dye) Filter paper (trade name Lister Paper (Grade 989, 10 cm ⁇ 10 cm) manufactured by MEZGER Inc.)
  • the numerical values of the water resistance indexes of the fiber treatment agents A to D are as follows. Fiber treatment agent A: 6.2 Textile treatment agent B: 1.0 Textile treatment agent C: 1.0 Textile treatment agent D: 49.0 The smaller the water resistance index, the higher the water resistance. It is considered that the water resistance increases in the order of the fiber treatment agents D, A, B, and C (B and C are substantially the same).
  • the ratio of the third liquid absorption time (seconds) to the first liquid absorption time (seconds) of the fiber treatment agents A to D was as follows. The smaller the value of this ratio, the higher the water resistance.
  • the thickness of the nonwoven fabric was measured using a thickness measuring machine (trade name THICKNESS GAUGE model CR-60A manufactured by Daiei Kagaku Seisakusho Co., Ltd.) with a load of 300 Pa applied to the nonwoven fabric.
  • a thickness measuring machine trade name THICKNESS GAUGE model CR-60A manufactured by Daiei Kagaku Seisakusho Co., Ltd.
  • Example 1 Using the fiber 1 to which 0.40% by mass of the fiber treating agent A was applied, a first fiber web serving as a first fiber layer was manufactured using a parallel card machine. The basis weight of the first fiber web was about 8 g / m 2 . The 2nd fiber web used as the 2nd fiber layer was manufactured using the parallel card machine using the fiber 2 to which the 0.4 mass% fiber processing agent A was provided. The basis weight of the second fiber web was about 12 g / m 2 . The first fiber web and the second fiber web were overlapped, heat-treated at 135 ° C. using a hot air through heat treatment machine, and integrated to obtain the nonwoven fabric of Example 1. The basis weight of the nonwoven fabric of Example 1 was 18.2 g / m 2 , and the thickness was 1.32 mm.
  • Comparative Examples 1 to 3 and 6 For Comparative Examples 1-3 and 6, the nonwoven fabric of Example 1 described above was manufactured except that the second fiber web was not manufactured and laminated using the fibers and fiber treatment agents listed in Table 3. Nonwoven fabrics of Comparative Examples 1 to 3 and 6 were obtained using the same method.
  • Examples 1 and 4 are compared with Comparative Examples 1 and 3, respectively. It can be seen that when the single layer is laminated, the third or fourth wetback, that is, the repeated durability with respect to the wetback amount is improved.
  • Example 3 is compared with Comparative Example 2. It can be seen that when the single layer is laminated, the repeated durability for the second to fourth liquid absorption times is greatly improved.
  • fiber treatment agents A to C are used. The fiber treatment agents A to C all have high hydrophilicity and high water resistance. It has been found that when these fiber treatment agents of the examples are used, repeated durability is improved by laminating a single layer.
  • Examples 1 and 3 to 4 are compared with Comparative Example 4.
  • fiber treatment agents A to C having high hydrophilicity and high water resistance are used for both the first fiber layer and the second fiber layer.
  • a fiber treatment agent D having low water resistance is used. It can be seen that when the fiber treatment agent having high hydrophilicity and high water resistance is used, the third and fourth wetbacks, that is, the repeated durability concerning the wetback amount and the repeated durability concerning the liquid absorption time are improved.
  • Comparative Example 4 is compared with Comparative Example 6 just in case.
  • a fiber treatment agent D having high hydrophilicity but low water resistance is used.
  • the fiber treatment agent D if the single layer is laminated, the liquid absorption time for the third to fourth times is not much different, but the amount of wetback for the third to fourth times is rather deteriorated. It can be understood that it is important to use a fiber treatment agent having high hydrophilicity and high water resistance.
  • Examples 1 and 3 to 4 are compared with Comparative Example 5. Both the first fiber layer and the second fiber layer use fiber treatment agents A to C having high hydrophilicity and high water resistance.
  • the fiber treatment agent for treating the first fiber layer and the fiber treatment agent for treating the second fiber layer are the same, but in Comparative Example 5, the fiber treatment for treating the first fiber layer. And the fiber treatment agent for treating the second fiber layer. In this case, there was no significant difference between the wetback and the liquid absorption speed.
  • Example 1 and Example 4 are compared. It is the third or fourth time to use fiber treatment agent A (Example 1) in which the hydrophilicity and water resistance of the fiber treatment agent are not too high rather than to use fiber treatment agent C (Example 4). It can be seen that repeated wetback is improved.
  • the contact angle measurement result is substantially the same as the run-off measurement result.
  • the present invention provides a nonwoven fabric, a sheet for absorbent articles, and an absorbent article containing the same. At least one selected from texture, wetback amount, liquid absorption time, diffusion length, repeated durability (wetback amount, liquid absorption time, diffusion length), cost, storage stability and the like is preferably improved.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un tissu non tissé ayant une structure comprenant au moins deux couches qui sont une première couche de fibres et une seconde couche de fibres : chacune de la première couche de fibres et de la seconde couche de fibres ayant une finesse spécifique ; le diamètre de fibre de la première couche de fibres étant supérieur au diamètre de fibre de la seconde couche de fibres ; chacune de la première couche de fibres et de la seconde couche de fibres a un caractère hydrophile tel qu'il permet de maintenir le niveau de cette dernière même lorsque la première couche de fibres et la seconde couche de fibres entrent en contact avec l'eau ; et la première couche de fibres et la seconde couche de fibres ont le même caractère hydrophile. Le tissu non tissé est modifié quant à au moins un élément choisi parmi la texture, la quantité de retour de l'humidité, la vitesse d'absorption de liquide, la longueur de diffusion, la durabilité de répétition (pour la quantité de retour de l'humidité, la vitesse d'absorption de liquide et la longueur de diffusion), l'aptitude à la conservation, et similaire, et convient pour une utilisation en tant qu'article absorbant.
PCT/JP2017/013641 2016-03-31 2017-03-31 Tissu non tissé pour article absorbant, feuille supérieure pour article absorbant et article absorbant les comprenant Ceased WO2017171017A1 (fr)

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CN201780020203.9A CN109069321A (zh) 2016-03-31 2017-03-31 吸收性物品用无纺布、吸收性物品用顶部片材、以及包含其的吸收性物品
KR1020187031218A KR20180131582A (ko) 2016-03-31 2017-03-31 흡수성 물품용 부직포, 흡수성 물품용 탑 시트, 및 그것을 포함하는 흡수성 물품
JP2018509662A JPWO2017171017A1 (ja) 2016-03-31 2017-03-31 吸収性物品用不織布、吸収性物品用トップシート、およびそれを含む吸収性物品
JP2022118698A JP7433583B2 (ja) 2016-03-31 2022-07-26 吸収性物品用不織布、吸収性物品用トップシート、およびそれを含む吸収性物品
JP2024000780A JP7848249B2 (ja) 2016-03-31 2024-01-05 吸収性物品用不織布、吸収性物品用トップシート、およびそれを含む吸収性物品

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JPWO2022113711A1 (fr) * 2020-11-27 2022-06-02
JP2023110380A (ja) * 2022-01-28 2023-08-09 大和紡績株式会社 吸収性物品用不織布およびその製造方法、ならびに吸収性物品

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