WO2017171017A1 - Nonwoven fabric for absorbent article, top sheet for absorbent article, and absorbent article including same - Google Patents
Nonwoven fabric for absorbent article, top sheet for absorbent article, and absorbent article including same Download PDFInfo
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- 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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- nonwoven fabric
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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
- 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
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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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—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
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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
- A61F13/53—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
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- 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
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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
- D04H1/42—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
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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
- A61F13/15577—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
- 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 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 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 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
- 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 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 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 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
- 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
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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
- A61F13/53—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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Abstract
Description
特許文献1は、二層構造の不織布を親水化すること、第1繊維層の繊維は水と接触するとその親水化度が低下しやすいことが好ましいことを述べる。しかし、特許文献1は、その実施例で、親水化度およびその耐水性について具体的に何も記載しておらず、更に風合いとウェットバック量以外の性質についても、何も示していない。 In addition to the texture and wetback amount, absorbent articles are also required to improve properties such as liquid absorption rate, diffusion length, repeated durability (of wetback amount, liquid absorption rate and diffusion length), storage stability, and cost. It is done. Furthermore, since a diaper or the like is not changed immediately after it gets wet, it is extremely important to be able to cope with repeated excretion (that is, repeated durability).
第1繊維層とその第1繊維層に隣接する第2繊維層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
第1繊維層を形成する繊維と第2繊維層を形成する繊維は、両方共、その繊維が水と接触してもその親水性の高さの程度(親水化度)が維持される親水化処理が施されており(すなわち、繊維の親水化度は耐水性を有し)、その親水性(親水性の高さの程度とその耐水性)は実質的に同じであり、
第1繊維層が人の肌に対向するように、不織布は配置される、吸収性物品用不織布を提供する。 That is, the present invention provides one aspect,
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. Treated (ie, the degree of hydrophilicity of the fiber is water resistant) and its hydrophilicity (the degree of hydrophilicity and its water resistance) is substantially the same,
The nonwoven fabric for absorbent articles is provided in which the nonwoven fabric is arranged so that the first fiber layer faces human skin.
第1繊維層とその第1繊維層に隣接する第2繊維層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
水と接触前の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(A1)と、水と接触前の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(A2)は、下記(I)を満たし、
(I):A1≦80°、A2≦80°、|A1-A2|<12
水と接触後の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(B1)と、水と接触後の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(B2)は、下記(II)を満たし、
(II):-5≦(B1-A1)<40°、-5≦(B2-A2)<40°
第1繊維層が人の肌に対向するように不織布は配置される、吸収性物品用不織布
を提供する。 Thus, in another aspect, 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 °, | A1-A2 | <12
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),
(II): −5 ≦ (B1-A1) <40 °, −5 ≦ (B2-A2) <40 °
Provided is a nonwoven fabric for absorbent articles in which the nonwoven fabric is disposed so that the first fiber layer faces human skin.
吸収性物品は、一般に液保持性の吸収体、液不透過性のバックシート、および液透過性のトップシートを含み、吸収体とトップシートの間にバックシートが配置される。本発明の実施形態に係る吸収性物品用不織布は、装着者の肌に当接するトップシートとして配置される。かかるバックシートおよび吸収体として、吸収性物品に通常用いられているものを用いることができる。
例えばバックシートとして、透湿性を有する又は有さない熱可塑性樹脂のフィルムを用いることができる。例えば吸収体として、パルプ繊維、高吸収性ポリマーの粒子又はそれらの混合物をティッシュペーパー等の紙等で包んだ又は挟んだ吸収体を用いることができる。 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 | positioned as a top sheet which contact | abuts a wearer's skin. As the back sheet and the absorbent body, those usually used for absorbent articles can be used.
For example, a film of a thermoplastic resin with or without moisture permeability can be used as the back sheet. For example, 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.
第1繊維層とその第1繊維層に隣接する第2繊維層を有する少なくとも二層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
第1繊維層を形成する繊維と第2繊維層を形成する繊維は、両方共、それらの繊維が水と接触してもそれらの親水性の高さの程度が維持される親水性を有し、それらの親水性は同じであり、
第1繊維層が人の肌に対向するように、すなわち、吸収性物品の外側を向くように、不織布は配置される。 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 | positioned so that a 1st fiber layer may face human skin, ie, it may face the outer side of an absorbent article.
第1繊維層とその第1繊維層に隣接する第2繊維層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
水と接触前の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(A1)と、水と接触前の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(A2)は、下記(I)を満たし、
(I):A1≦80°、A2≦80°、|A1-A2|<12
水と接触後の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(B1)と、水と接触後の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(B2)は、下記(II)を満たし、
(II):-5≦(B1-A1)<40°、-5≦(B2-A2)<40°
第1繊維層が人の肌に対向するように不織布は配置される。 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 °, | A1-A2 | <12
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),
(II): −5 ≦ (B1-A1) <40 °, −5 ≦ (B2-A2) <40 °
A nonwoven fabric is arrange | positioned so that a 1st fiber layer may oppose human skin.
第2繊維層を形成する繊維の繊度は、1.7~5.6dtexであり、好ましくは2.0~5.0dtexであり、より好ましくは2.6~4.0dtexである。
更に、第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さい。
従って、本発明においては、人の肌に対向する第1繊維層に、より細い繊維を使用し、吸収体に対向する第2繊維層に、第1繊維層より、太い繊維を使用する。
人の肌に対向する第1繊維層の繊維は、第2繊維層の繊維より、より細い特定の繊度を有するので、風合い、触感が向上し好ましい。 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.
Furthermore, 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.
第1繊維層を形成する繊維の繊維径は、10~20μmが好ましく、12~19μmがより好ましく、14~18μmがさらに好ましい。
第2繊維層を形成する繊維の繊維径は、13~28μmが好ましく、15~26μmがより好ましく、17~24μmがさらに好ましく、17~21μmがさらにより好ましい。 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 μm, more preferably 12 to 19 μm, and still more preferably 14 to 18 μm.
The fiber diameter of the fibers forming the second fiber layer is preferably 13 to 28 μm, more preferably 15 to 26 μm, still more preferably 17 to 24 μm, and even more preferably 17 to 21 μm.
第1繊維層の繊維は、例えば、下記の繊維を含むことができる:コットン、シルクおよびウールなどの天然繊維;ビスコースレーヨン、キュプラ、および溶剤紡糸セルロース繊維(例えば、レンチングリヨセル(登録商標)およびテンセル(登録商標))等の再生繊維;ポリオレフィン系繊維、ポリエステル系繊維、ポリアミド系繊維、アクリルニトリルからなる(ポリ)アクリル系繊維、ポリカーボネート系繊維、ポリアセタール系繊維、ポリスチレン系繊維、および環状ポリオレフィン系繊維などの合成繊維。
第1繊維層の繊維は、単一種類の樹脂でできている繊維のみならず、二種以上の樹脂でできている複合繊維(例えば、同心または偏心の芯鞘型複合繊維、海島型複合繊維、サイドバイサイド型複合繊維)を用いることもできる。
なお、天然繊維を含む場合、その繊度または繊維径については、JIS L 1019 7.4.1 マイクロネヤによる方法に準じ、算出できる。 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.
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.
When natural fibers are included, the fineness or fiber diameter can be calculated according to the method according to JIS L 1019 7.4.1 Micro Ney.
第1繊維層の繊維は、例えば、ポリエチレンテレフタレート等のポリエステル系繊維;および、ポリエチレン(高密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレン)、ポリプロピレン、エチレン-プロピレン共重合体、エチレン-ブテン-1-プロピレン三元共重合体等のポリオレフィン系繊維;およびそれらを組み合わせた繊維を含むことができる。 As 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.
これらの繊維は、単独で、又は組み合わせて用いることができる。 It is more preferable that the polyethylene is high-density polyethylene because crimps can be easily imparted. In the present invention, as will be described later, a fiber treating agent can be used to impart hydrophilicity to the fiber. In the case where crimps can be easily imparted to the fiber, for example, 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.
These fibers can be used alone or in combination.
同心又は偏心芯鞘型の複合繊維が好ましく、同心芯鞘型複合繊維が第1繊維層の厚さを薄くできるためより好ましい。
不織布の厚さは薄い方が、吸収体までの距離が短くなるため液の移動性が良く、吸液時間やウェットバック量がより向上し得るので、第1繊維層も厚さは、薄い方が好ましい。
ポリエステル系樹脂とポリオレフィン系樹脂から構成される同心又は偏心芯鞘型の複合繊維が更により好ましい。特に芯成分がポリエステル系樹脂であり、鞘成分がポリオレフィン系樹脂である芯鞘型の複合繊維が好ましい。 When two kinds of fibers are combined, 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. In particular, 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.
第1繊維層の繊維は、風合いや触感を向上させるために、繊維中に酸化チタン等の添加剤を含むことができる。このような添加剤は、添加剤等も含む繊維全体を100質量%として、0.1~10質量%含まれることが好ましく、1~5質量%含まれることがより好ましい。また、第1繊維層の繊維が芯鞘型複合繊維である場合、添加剤は芯成分により多く含まれていることが好ましく、芯成分のみに含まれていることが好ましい。添加剤が鞘成分に含まれている場合、不織布等の製造装置が傷つけられることがある。 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. When the fibers of the first fiber layer contain 50% by mass or more of the concentric core-sheath composite fiber, the increase in the thickness of the nonwoven fabric can be further suppressed.
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. Moreover, when the fiber of a 1st fiber layer is a core-sheath-type composite fiber, it is preferable that many additives are contained in the core component, and it is preferable that it is contained only in the core component. When the additive is contained in the sheath component, a manufacturing apparatus such as a nonwoven fabric may be damaged.
第2繊維層の繊維は、例えば、下記の繊維を含むことができる:コットン、シルクおよびウールなどの天然繊維;ビスコースレーヨン、キュプラ、および溶剤紡糸セルロース繊維(例えば、レンチングリヨセル(登録商標)およびテンセル(登録商標))等の再生繊維;ポリオレフィン系繊維、ポリエステル系繊維、ポリアミド系繊維、アクリルニトリルからなる(ポリ)アクリル系繊維、ポリカーボネート系繊維、ポリアセタール系繊維、ポリスチレン系繊維、および環状ポリオレフィン系繊維などの合成繊維。
第2繊維層の繊維は、単一種類の樹脂でできている繊維のみならず、二種以上の樹脂でできている複合繊維(例えば、同心または偏心の芯鞘型複合繊維、海島型複合繊維、サイドバイサイド型複合繊維)を用いることもできる。
なお、天然繊維を含む場合、その繊度または繊維径については、JIS L 1019 7.4.1 マイクロネヤによる方法に準じ、算出できる。 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.
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.
When natural fibers are included, the fineness or fiber diameter can be calculated according to the method according to JIS L 1019 7.4.1 Micro Ney.
第2繊維層の繊維は、例えば、ポリエチレンテレフタレート等のポリエステル系繊維;および、ポリエチレン(高密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレン)、ポリプロピレン、エチレン-プロピレン共重合体、エチレン-ブテン-1-プロピレン三元共重合体等のポリオレフィン系繊維;およびそれらを組み合わせた繊維を含むことができる。 As the fibers of the second fiber layer, synthetic fibers 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.
これらの繊維は、単独で、又は組み合わせて用いることができる。 It is more preferable that the polyethylene is high-density polyethylene because crimps can be easily imparted. In the present invention, as will be described later, a fiber treating agent can be used to impart hydrophilicity to the fiber. In the case where crimps can be easily imparted to the fiber, for example, 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.
These fibers can be used alone or in combination.
同心又は偏心芯鞘型の複合繊維が好ましく、同心芯鞘型複合繊維が第2繊維層の厚さを薄くできるためより好ましい。
不織布の厚さは薄い方が、吸収体までの距離が短くなるため液の移動性が良く、吸液時間やウェットバック量がより向上し得るので、第2繊維層も厚さは、薄い方が好ましい。
ポリエステル系樹脂とポリオレフィン系樹脂から構成される同心又は偏心芯鞘型の複合繊維が更により好ましい。特に芯成分がポリエステル系樹脂であり、鞘成分がポリオレフィン系樹脂である芯鞘型の複合繊維が好ましい。 When two kinds of fibers are combined, 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. In particular, 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.
不織布全体の目付は使い捨ておむつの場合、なるべく低いことがコストの面でよく、その場合の目付は10~50g/m2であることが好ましく、15~40g/m2であることがより好ましい。 Further, 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 .
In the case of a disposable diaper, the overall weight of the nonwoven fabric may be as low as possible in terms of cost. In that case, the basis weight is preferably 10 to 50 g / m 2 , and more preferably 15 to 40 g / m 2 .
第2繊維層の目付は3~40g/m2であることが好ましく、8~20g/m2であることがより好ましい。 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 .
「水と接触しても親水性の高さの程度が維持される親水性」は、下記の耐水性指標の測定方法により得られた耐水性指標が15以下であることが好ましく、14以下であることがより好ましく、10以下であることが特に好ましい。耐水性指標が小さいほど、親水性の耐水性は高いと考えられる。
耐水性指標が15以下である場合、繰り返しの吸液特性(吸液特性の耐久性)、特に繰り返しのウェットバック特性(ウェットバックの耐久性)が、より良好になり、より好ましい。 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.
(1)ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、同心芯鞘型複合繊維(繊度:2.0dtex、繊維長:45mm)(例えば、ダイワボウポリテック社製NBF(登録商標) 品番(SH))に、繊維処理剤を0.40質量%付与し、パラレルカード法およびエアスルー法(加熱温度:135℃、処理時間:10秒、風速:1.0m/s)を用いて、不織布サンプル(目付:20.0g/m2、寸法:タテ10.0cm×ヨコ10.0cm、厚さ:1.2mm)を製造して用意した。
その他下記物品を用意した。
注入筒付きプレート(EDANA Nonwovens Standard Procedures - Edition 2015 の NWSP 070.3.R0 (15) に記載の Strike-through plate を使用)
0.90%生理食塩水(青色染料で着色)
ろ紙(MEZGER inc.製の商品名Lister Paper(Grade989、10cm×10cm)) The hydrophilic water resistance (water resistance index) of the fiber treatment agent is evaluated as follows.
(1) 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). Prepared.
In addition, the following items were prepared.
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.)
(i)ろ紙を3枚積層し、その上に不織布サンプルを積層した。その上に注入筒付きプレートを乗せた。
(ii)約37℃に温めた生理食塩水5.0mlを筒から注入した。注入してから生理食塩水が不織布表面から見えなくなる(液体として生理食塩水が確認されなくなる)までの時間を計測し、吸液時間とした。
(iii)吸液後30秒静置した後、上記(ii)を繰り返して2回測定を行った。合計3回、吸液時間を測定した。
(iv)耐水性指標は下記式により算定した。
式:耐水性指標=3回目の吸液時間(秒)-1回目の吸液時間(秒) (2) The liquid absorption time of the nonwoven fabric sample was measured by the following method.
(I) Three filter papers were laminated, and a nonwoven fabric sample was laminated thereon. A plate with an injection tube was placed thereon.
(Ii) 5.0 ml of physiological saline warmed to about 37 ° C. was injected from the cylinder. The time from the injection until the physiological saline disappeared from the surface of the nonwoven fabric (the physiological saline was no longer confirmed as a liquid) was measured and used as the liquid absorption time.
(Iii) After standing for 30 seconds after liquid absorption, the measurement was performed twice by repeating the above (ii). The liquid absorption time was measured 3 times in total.
(Iv) The water resistance index was calculated by the following formula.
Formula: Water resistance index = 3rd liquid absorption time (second)-1st liquid absorption time (second)
ランオフ2~5回目の総和が、9.0~30である場合、繰り返しの吸液特性、特に繰り返しのウェットバック特性が、より良好になり、より好ましい。 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-
When the sum of
ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、同心芯鞘型複合繊維(繊度:2.0dtex、繊維長:45mm)(例えば、ダイワボウポリテック社製NBF(登録商標) 品番(SH))に、繊維処理剤を0.40質量%付与し、パラレルカード法およびエアスルー法(加熱温度:135℃、処理時間:10秒、風速:1.0m/s)を用いて、不織布サンプル(目付:20.0g/m2、寸法:タテ18.0cm×ヨコ7.0cm、厚さ:0.70mm)を製造して用意した。 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)), 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: 10 seconds, A non-woven fabric sample (weight per unit: 20.0 g / m 2 , dimensions: length 18.0 cm × width 7.0 cm, thickness: 0.70 mm) was prepared using wind speed: 1.0 m / s).
また、第1繊維層を形成する繊維と第2繊維層を形成する繊維に実質的に同じ親水性が施されていることで、第1繊維層と第2繊維層との親水性が混在して吸液特性が変化することがないため好ましい。 Furthermore, 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.
水と接触前の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(A1)と、水と接触前の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(A2)は、下記(I)を満たし、
(I):A1≦80°、A2≦80°、|A1-A2|<12
水と接触後の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(B1)と、水と接触後の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(B2)は、下記(II)を満たす。
(II):-5≦(B1-A1)<40°、-5≦(B2-A2)<40° That is, 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 °, | A1-A2 | <12
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).
(II): −5 ≦ (B1-A1) <40 °, −5 ≦ (B2-A2) <40 °
A1及びA2は、各繊維層を形成する繊維の表面に約20℃のイオン交換水を噴霧することで、噴霧されたイオン交換水の微小な水滴が繊維表面に付着し、その液滴の表面と繊維表面とがなす角の角度をいう。
A1及びA2は、本発明の形態の吸収性物品用不織布において、尿や経血といった吸収性物品の着用者(人やほ乳類動物を含む)から排出される液体を受ける前の繊維層表面における親水性の高低を示す。 In the nonwoven fabric for absorbent articles in the form of the present invention, 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.
A1及びA2が、両方共80°以下なので、第1繊維層の親水性および第2繊維層の親水性の両方共十分に高く、尿や経血、軟便などが排出されて不織布に接したとき、これらの液体や排出物に含まれる水分と繊維とがなじみやすく、不織布がこれらの液体や水分を瞬時に吸収しやすくなる。
A1及びA2の両方共、20°以上80°以下であることが好ましく、30°以上75°以下であることがより好ましく、35°以上75°以下であることが特に好ましく、40°以上70°以下であることが最も好ましい。 In the nonwoven fabric for absorbent articles in the form of the present invention, 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:
従って、本発明の形態の吸収性物品用不織布は、A1とA2の差の絶対値が12未満である(|A1-A2|<12)。
A1とA2の差の絶対値が、12未満なので、本発明の形態の吸収性物品用不織布は、水と接触前の第1繊維層が奏する親水性の強さ(親水化度)と、水と接触前の第2繊維層が奏する親水性の強さ(親水化度)が同程度である。
即ち、例えば、第1繊維層を構成する繊維が処理された繊維処理剤の親水性の強さと、第2繊維層を構成する繊維が処理された繊維処理剤の親水性の強さは、同程度である。
A1とA2の差の絶対値が12未満なので、第1繊維層の親水化度と、第2繊維層の親水化度が同程度であり、尿や経血に対するなじみやすさが同程度であり、一方の層が他方の層と比較して極端に親水性が高く、尿や経血等の液体を保持しやすくなるということが生じ難い。
A1とA2の差の絶対値は、10以下であることが好ましく、8以下であることがより好ましく、6以下であることが特に好ましい。 In the nonwoven fabric for absorbent articles according to the present invention, 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 (| A1-A2 | <12).
Since the absolute value of the difference between A1 and A2 is less than 12, the non-woven fabric for absorbent articles according to the embodiment of the present invention has hydrophilic strength (degree of hydrophilization) exhibited by the first fiber layer before contact with water, The hydrophilic strength (degree of hydrophilization) exhibited by the second fiber layer before contact is approximately the same.
That is, for example, 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. Degree.
Since the absolute value of the difference between A1 and A2 is less than 12, the hydrophilization degree of the first fiber layer and the hydrophilization degree of the second fiber layer are the same, and the compatibility with urine and menstrual blood is the same. 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.
B1及びB2とは、不織布に対し約20℃のイオン交換水0.04mlを通過させ、不織布を自然乾燥させた後、イオン交換水を通過させた部分の不織布表面に約20℃のイオン交換水を噴霧することで微小な液滴が繊維表面に付着し、その液滴の表面と繊維表面とがなす角の角度をいう。
B1及びB2は、本発明の形態の吸収性物品用不織布を得られる限り、特に限定されないが、90°未満であることが好ましい。
B1及びB2が90°未満である場合、第1繊維層、第2繊維層の親水性がある程度維持されており、尿や経血が繰り返し排出された場合であっても十分に吸収できる。B1及びB2は、30°以上85°以下であることがより好ましく、40°以上80°以下であることが特に好ましく、45°以上80°以下であることが最も好ましい。 Next, in the nonwoven fabric for absorbent articles according to the present invention, the contact angle (B1) of ion-exchanged water with the surface of the fibers forming the first fiber layer after contact with water (after liquid permeation), and contact with water 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. By spraying, fine droplets adhere to the fiber surface, and the angle between the surface of the droplet and the fiber surface is defined.
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.
B1とB2の差の絶対値が、14未満である場合、水と接触後(液透過後)も第1繊維層及び第2繊維層の各々を形成する繊維の表面が奏する親水性の高さが同程度であることを意味する。即ち、第1繊維層及び第2繊維層の親水性の高低(親水化度)が同程度であり、尿や経血に対するなじみやすさが、これらの液体を通過させた後でも同程度となり、一方の層が他方の層と比較して極端に親水性が高く、尿や経血といった液体を保持しやすくなる、ということが発生しにくい。
B1及びB2の差の絶対値は12以下であることがより好ましく、10以下であることが特に好ましく、8以下であることが最も好ましい。 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.
When 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. That is, 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.
-5≦(B1-A1)<40°、-5≦(B2-A2)<40°
B1-A1及びB2-A2が、前記の範囲にあるので、第1繊維層および第2繊維層を形成する繊維表面の親水性の耐久性、即ち、繊維表面に付与された繊維処理剤の水(例えば、尿や経血等の液体、軟便などに含まれる水分)に対する耐久性が適度であり、水に徐々に少しずつ溶出する繊維処理剤であり得る。
このような繊維処理剤が付与された繊維層は、水を複数回吸収及び通過可能な親水化度を維持するが、徐々に親水化度が低下するため、各繊維層が水を保持し続けにくくなり、繊維層中に残った液体が不織布表面に戻る液戻り(いわゆるウェットバック)の量を抑えることができると考えられる。 In the nonwoven fabric for absorbent articles in the form of the present invention, there is the following relationship between 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 °
Since 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 For example, 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.
B1-A1及びB2-A2が40°以上の場合、即ち、水との接触で親水化度が大きく低下している場合、この繊維層は親水化度が水との接触で低下しやすい繊維であるだけでなく、水との接触後の繊維層が示す親水化度も低い繊維層になっている。このような繊維層は、親水化度の耐水性が低いため、水と接触により親水化度が大きく低下しやすく、水(例えば、尿や経血等)を複数回吸収及び通過させることが難しくなり、水(例えば、尿や経血等)の漏れが発生しやすくなる。
B1-A1及びB2-A2は、-3°以上35°以下であることが好ましく、0°以上30°以下であることがより好ましく、3°以上25°以下であることが特に好ましく、5°以上20°以下であることが最も好ましい。 When B1-A1 and B2-A2 are smaller than −5 °, 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.
When 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. Since such a fiber layer has low water resistance of the degree of hydrophilicity, the degree of hydrophilicity is likely to be greatly reduced by contact with water, and it is difficult to absorb and pass water (for example, urine and menstrual blood) multiple times. Therefore, leakage of water (for example, urine and menstrual blood) is likely to occur.
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.
即ち、B1-A1とB2-A2の差である(B1―A1)-(B2-A2)の絶対値(|(B1-A1)-(B2-A2)|)が18以下であることが好ましい。
水と接触の前後で第1繊維層の接触角の変化と第2繊維層の接触角の変化が、同程度なので、第1繊維層の親水性の耐久性と第2繊維層の親水性の耐水性(即ち、第1繊維層を形成する繊維の表面に付着した繊維処理剤の液体に対する耐久性と、第2繊維層を形成する繊維に付着した繊維処理剤の水に対する耐久性)は、同程度の強さであり、水との接触によって、同程度に、繊維処理剤による親水化度は、低下し得る。
水と接触後、第1繊維層及び第2繊維層のいずれか一方の親水化度(液体への親和性)が極端に高い、又は極端に低いということを生じないため、液戻り量が更に低下しやすいと考えられる。
B1-A1とB2-A2の差((B1-A1)-(B2-A2))の絶対値が15以下であることがより好ましく、12以下であることが特に好ましく、10以下であることがと最も好ましい。 In the nonwoven fabric for absorbent articles in the form of the present invention, the change in contact angle (B1-A1) in the first fiber layer before and after contact with water and the change in contact angle (B2-A1) in the second fiber layer before and after contact with water. A2) is preferably comparable.
That is, the absolute value (| (B1-A1)-(B2-A2) |) of (B1-A1)-(B2-A2), which is the difference between B1-A1 and B2-A2, is preferably 18 or less. .
Since the change in the contact angle of the first fiber layer and the change in the contact angle of the second fiber layer are the same before and after contact with water, the hydrophilic durability of the first fiber layer and the hydrophilicity of the second fiber layer Water resistance (that is, the durability of the fiber treatment agent attached to the surface of the fiber forming the first fiber layer with respect to the liquid and the durability of the fiber treatment agent attached to the fiber forming the second fiber layer with respect to water) is: 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.
第1繊維層を形成する繊維表面の水の接触角と、第2繊維層を形成する繊維表面の水の接触角は、各繊維層表面にイオン交換水を噴霧し、各繊維層を形成する繊維表面とその水滴の表面がなす角の角度を測定する。
水と繊維表面との接触角は下記の方法で測定することができる。
(株)キーエンス製マイクロスコープVHX-1000にズームレンズ((株)キーエンス製、型番:VH-Z100R)を取り付けた測定部を水平方向に倒した状態で固定する。接触角の測定対象である繊維を含む不織布を縦(MD方向)×横(CD方向)が50mm×10mmの大きさとなるようにカットして、測定サンプルを作製する。測定サンプルの測定面を上向きにした状態で、ズームレンズのレンズ面に対して不織布のCD方向が垂直となる向きにして(すなわち、観察方向がCD方向と平行となるように)測定サンプルを試験台に置いて、両端をテープで固定する。なお、観察方向(ズームレンズを通して対象物を見る方向)は、観察方向と直交する方向に繊維が延びているように選択される限りにおいて、特に限定されない。不織布の種類によっては、不織布のCD方向と例えば45°の角度をなす方向を観察方向としてよい。 [Measurement of contact angle before liquid permeation]
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 measuring unit, to which a zoom lens (manufactured by Keyence Corporation, model number: VH-Z100R) is attached to a microscope VHX-1000 manufactured by Keyence Corporation, is fixed in a state where it is tilted horizontally. 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. Note that 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. Depending on the type of nonwoven fabric, the viewing direction may be a direction that forms an angle of 45 ° with the CD direction of the nonwoven fabric, for example.
接触角は、不織布を用いて測定せずに、測定面から対象となる構成繊維を取り出して、構成繊維に水滴を吹き付ける方法で測定してもよい。 As shown in FIG. 1, 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.
(1)繊維の上に載った水滴の接触角を測定する。繊維の下まで垂れ下がった水滴及び2本以上の繊維にまたがった水滴の接触角を測定しない。
(2)繊維が螺旋状等の細かい捲縮を発生している場合は、捲縮が少ないところか、繊維を伸張させて捲縮状態を無くして測定する。
(3)接触角の測定結果は、上記のとおり、測定する箇所又は測定サンプルを変えて、繊維が水平になっている画像を10点以上選んで測定値を平均して求める。繊維の親水化度が高い場合、接触角を測定するときに繊維の上で水滴が移動し得る(すなわち、水滴の形状が変化し得る)。その場合、その移動の状況を考慮して「接触角」を求める。
接触角の測定箇所が20点になるまでに、測定回数の合計(水滴の撮影を試みた測定箇所の合計、撮影中に水滴が移動した場合と移動しなかった場合の合計)の40%未満で水滴が移動した場合、繊維が水平になっている画像を10点以上選んで測定値を平均して接触角とする。
接触角の測定箇所が20点になるまでに、測定回数の合計の40%以上で水滴が移動した場合、接触角は20°以下とする。 Pay attention to the following points when measuring the contact angle.
(1) Measure the contact angle of a water drop placed on the fiber. Do not measure the contact angle of water drops that hang down to the bottom of the fiber and water drops that span two or more fibers.
(2) When the fiber has a fine crimp such as a spiral shape, it is measured at a place where the crimp is small or the fiber is stretched to eliminate the crimped state.
(3) As described above, the measurement result of the contact angle is obtained by changing the place to be measured or the measurement sample, selecting 10 or more images in which the fibers are horizontal, and averaging the measured values. When the degree of hydrophilicity of the fiber is high, water droplets can move on the fiber when measuring the contact angle (ie, the shape of the water droplets can change). In this case, 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 When the water droplet moves, 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.
以下のようにして、接触角測定用の不織布サンプルを調製する以外は、上述した液透過前の接触角の測定方法と同様にして測定する。 [Measurement of contact angle after liquid permeation]
The measurement is performed in the same manner as described above for the contact angle before liquid permeation except that a nonwoven fabric sample for contact angle measurement is prepared as follows.
不織布をタテ方向22cm、ヨコ方向5cmの寸法に裁断して測定サンプルを作製する。次に、図2に示す、直径15mmの穴が等間隔(穴の中心間の距離は20mm)に開けられたステンレス製のプレートを用意する。プレートの穴内の4箇所に油性のマジックペンでマーキングする。プレートを測定サンプルの測定面の上に置く。測定サンプルにステンレス製プレートを載せたまま、ステンレス製プレートに設けた穴の中心部分に位置する測定サンプルの測定面に対し、約20℃に調整した0.04mlのイオン交換水を、駒込ピペット又はビュレットを用いて滴下させる。イオン交換水を滴下後、測定サンプルのイオン交換水を吸収させる。滴下した水滴が測定サンプル表面から消失後、測定サンプルを20~50℃の雰囲気中で乾燥させる。なお、測定サンプルに水滴を滴下後、水滴を吸収させる際、水滴が残っている部分を吸引して、水分を下側の層(第2繊維層、もしあれば)に強制的に吸収させてもよい。 [Adjustment of non-woven fabric sample]
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. Next, 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. After the ion exchange water is dropped, 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.
以下、液透過前の接触角の測定方法と同様の方法で、測定サンプルの繊維上の水滴を観察することで、水透過後の接触角を測定する。 The dried measurement sample is cut along a straight line passing through
Hereinafter, 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.
一体化された不織布の第1繊維層の繊維と第2繊維層の繊維は、接着されていてよい。
本発明の形態の吸収性物品用不織布は、必要に応じて、更に、不織布が通常有する追加の層を有することができる。 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. As long as the nonwoven fabric for absorbent articles intended by the present invention can be obtained, the production method is not particularly limited. As such 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.
更に、本発明は、そのような吸収性物品用不織布を含む、種々の吸収性物品を提供することができる。 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.
繊維1:ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、繊度2.0dtex(繊維径15μm)、繊維長45mmの同心芯鞘型複合繊維(ダイワボウポリテック(株)製の商品名NBF(登録商標) 品番(SH))
繊維2:ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、繊度3.3dtex(繊維径19μm)、繊維長51mmの同心芯鞘型複合繊維(ダイワボウポリテック(株)製の商品名NBF(登録商標) 品番(SH))
繊維3:ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、繊度4.4dtex(繊維径22μm)、繊維長51mmの同心芯鞘型複合繊維(ダイワボウポリテック(株)製の商品名NBF(登録商標) 品番(SH)) [Fibers] used for producing the nonwoven fabrics of Examples and Comparative Examples are shown below.
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 μm), 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 μm), 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 μm), 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.)
繊維処理剤A:C12アルキルリン酸エステルカリウム塩を含み、耐水性を有する、耐水親水性繊維処理剤
繊維処理剤B:C12アルキルリン酸エステルカリウム塩を含み、繊維処理剤Aより高い耐水性を有する、耐水親水性繊維処理剤
繊維処理剤C:C12アルキルリン酸エステルカリウム塩を含み、繊維処理剤Bより高い親水性を有する、耐水親水性繊維処理剤
繊維処理剤D:C12アルキルリン酸エステルカリウム塩を含み、耐水性を有さない、親水性繊維処理剤 [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 Water-resistant hydrophilic fiber treatment agent Fiber treatment agent C: C12 alkyl phosphate ester potassium salt, water-resistant hydrophilic fiber treatment agent having higher hydrophilicity than fiber treatment agent B Fiber treatment agent D: C12 alkyl phosphate ester Hydrophilic fiber treatment agent that contains potassium salt and does not have water resistance
繊維処理剤A~Dの湿潤時の親水性の高さは、下記のようにして行ったランオフ(run-off)2~5回の数値の総和で規定した。各回の数値が小さいほど、親水性が高く、ランオフの回数が増えても数値の変化が小さいほど、耐水性が高い。その結果、ランオフ2~5回の数値の総和が小さいほど、湿潤時の親水性が高いと考えられる。 [Hydrophilicity of fiber treatment agent when wet (total of
The wetness of the fiber treatment agents A to D was defined by the sum of the numerical values of run-off performed 2 to 5 times as follows. The smaller the numerical value of each time, the higher the hydrophilicity, and the smaller the change in the numerical value even when the number of run-offs increases, the higher the water resistance. As a result, it is considered that the hydrophilicity when wet is higher as the sum of the numerical values of run-off 2-5 times is smaller.
結果を表1に示す。
繊維処理剤D、A、B、Cの順に、湿潤時の親水性が高くなると考えられる。 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.
繊維処理剤A:19.5
繊維処理剤B:14.9
繊維処理剤C:13.6
繊維処理剤D:61.4 Moreover, when the above-mentioned run-off index was calculated, the numerical values were as follows.
Fiber treatment agent A: 19.5
Fiber treatment agent B: 14.9
Fiber treatment agent C: 13.6
Textile treatment agent D: 61.4
繊維処理剤A~Dの耐水性指標は次の方法により評価した。
(1)ポリエチレンテレフタレートが芯であり、高密度ポリエチレンが鞘であり、複合比(芯/鞘、質量比)が60/40である、同心芯鞘型複合繊維(繊度:2.0dtex、繊維長:45mm)(ダイワボウポリテック社製NBF(登録商標) 品番(SH))に、繊維処理剤を0.40質量%付与し、パラレルカード法およびエアスルー法(加熱温度:135℃、処理時間:10秒、風速:1.0m/s)を用いて、不織布サンプル(目付:20.0g/m2、寸法:タテ10.0cm×ヨコ10.0cm、厚さ:1.2mm)を製造して用意した。
その他下記物品を用意した。
注入筒付きプレート(EDANA Nonwovens Standard Procedures - Edition 2015 の NWSP 070.3.R0 (15) に記載の Strike-through plate を使用)
0.90%生理食塩水(青色染料で着色)
ろ紙(MEZGER inc.製の商品名Lister Paper(Grade989、10cm×10cm)) [Hydrophilic water resistance of fiber treatment agents (water resistance index)]
The water resistance index of the fiber treatment agents A to D was evaluated by the following method.
(1) 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) (Niwa (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: 10 seconds) The 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: vertical 10.0 cm × width 10.0 cm, thickness: 1.2 mm). .
In addition, the following items were prepared.
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.)
吸液時間を下記方法によって測定した。
(i)ろ紙を3枚積層し、その上に不織布サンプルを積層した。その上に注入筒付きプレートを乗せた。
(ii)約37℃に温めた生理食塩水5.0mlを筒から注入した。注入してから生理食塩水が不織布表面から見えなくなる(液体として生理食塩水が確認されなくなる)までの時間を計測し、吸液時間とした。
(iii)吸液後30秒静置した後、上記(ii)を繰り返して2回測定を行った。合計3回、吸液時間を測定した。
(iv)耐水性指標は下記式により算定した。
式:耐水性指標=3回目の吸液時間(秒)-1回目の吸液時間(秒) (2) Method The liquid absorption time was measured by the following method.
(I) Three filter papers were laminated, and a nonwoven fabric sample was laminated thereon. A plate with an injection tube was placed thereon.
(Ii) 5.0 ml of physiological saline warmed to about 37 ° C. was injected from the cylinder. The time from the injection until the physiological saline disappeared from the surface of the nonwoven fabric (the physiological saline was no longer confirmed as a liquid) was measured and used as the liquid absorption time.
(Iii) After standing for 30 seconds after liquid absorption, the measurement was performed twice by repeating the above (ii). The liquid absorption time was measured 3 times in total.
(Iv) The water resistance index was calculated by the following formula.
Formula: Water resistance index = 3rd liquid absorption time (second)-1st liquid absorption time (second)
繊維処理剤A:6.2
繊維処理剤B:1.0
繊維処理剤C:1.0
繊維処理剤D:49.0
耐水性指標が小さいほど、耐水性は高いと考えられる。
繊維処理剤D、A、B、Cの順に(但し、BとCは、ほぼ同じ)、耐水性が高くなると考えられる。 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).
繊維処理剤A:8.0
繊維処理剤B:2.3
繊維処理剤C:2.0
繊維処理剤D:50.5 Further, depending on the liquid absorption time used for the calculation of the water resistance index, the ratio of the third liquid absorption time (seconds) to the first liquid absorption time (seconds) of the fiber treatment agents A to D (third time) The liquid absorption time (second) / first liquid absorption time (second) was as follows. The smaller the value of this ratio, the higher the water resistance.
Textile treatment agent A: 8.0
Fiber treatment agent B: 2.3
Textile treatment agent C: 2.0
Textile treatment agent D: 50.5
不織布の厚さは、厚み測定機((株)大栄科学精器製作所製の商品名 THICKNESS GAUGE モデル CR-60A)を用い、不織布に300Paの荷重を加えた状態で測定した。 [Thickness of non-woven fabric]
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.
不織布の液透過前および液透過後の接触角は前記の方法で測定した。その測定結果を表4に示す。 [Measurement of contact angle before and after liquid passage]
The contact angle of the nonwoven fabric before and after liquid permeation was measured by the method described above. The measurement results are shown in Table 4.
0.40質量%の繊維処理剤Aが付与されている繊維1を用い、パラレルカード機を使用して、第1繊維層となる第1繊維ウェブを製造した。第1繊維ウェブの目付は、約8g/m2であった。
0.4質量%の繊維処理剤Aが付与されている繊維2を用い、パラレルカード機を使用して、第2繊維層となる第2繊維ウェブを製造した。第2繊維ウェブの目付は、約12g/m2であった。
この第1繊維ウェブと第2繊維ウェブとを重ね合わせて、熱風貫通式熱処理機を用いて135℃で熱処理し、一体化して、実施例1の不織布を得た。実施例1の不織布の目付は、18.2g/m2であり、厚さは、1.32mmであった。 [Example 1]
Using the
The 2nd fiber web used as the 2nd fiber layer was manufactured using the parallel card machine using the
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.
実施例2~4および比較例4~5について、表2~3に記載した繊維および繊維処理剤を使用して、上述の実施例1の不織布の製造方法と同様の方法を用いて、実施例2~4および比較例4~5の不織布を得た。 [Examples 2 to 4] and [Comparative Examples 4 to 5]
For Examples 2 to 4 and Comparative Examples 4 to 5, using the fibers and fiber treatment agents listed in Tables 2 to 3, and using the same method as the above-described method for producing the nonwoven fabric of Example 1, Nonwoven fabrics of 2 to 4 and Comparative Examples 4 to 5 were obtained.
比較例1~3および6について、表3に記載した繊維および繊維処理剤を使用して、第2繊維ウェブを製造して積層しなかったことを除いて、上述の実施例1の不織布の製造方法と同様の方法を用いて、比較例1~3および6の不織布を得た。 [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.
[吸収性物品の製造]
市販のおむつ(大王製紙株式会社製の商品名GOO.N(登録商標))から、トップシート/セカンドシート/吸収体の三層構造の吸収性物品を取り出した。その吸収性物品からトップシートを剥がして除去し、そのトップシートの代わりに、上述の実施例および比較例の不織布を積層して、評価用吸収性物品を得た。尚、積層の際、第1繊維層が、外側に向くように配置した。この評価用吸収性物品を用いて、実施例および比較例の不織布の吸液性(ウェットバック、吸液時間および拡散長)を評価した。 About the nonwoven fabric of the Example and the comparative example which were obtained in this way, the liquid absorbent article for evaluation was manufactured and the absorptivity was evaluated.
[Manufacture of absorbent articles]
An absorbent article having a three-layer structure of top sheet / second sheet / absorber was taken out from a commercially available diaper (trade name GOO.N (registered trademark) manufactured by Daio Paper Corporation). The top sheet was peeled off from the absorbent article and removed, and the nonwoven fabrics of the above-described Examples and Comparative Examples were laminated instead of the top sheet to obtain an absorbent article for evaluation. In addition, it arrange | positioned so that the 1st fiber layer might face outside at the time of lamination | stacking. Using this absorbent article for evaluation, the liquid absorbability (wet back, liquid absorption time and diffusion length) of the nonwoven fabrics of Examples and Comparative Examples was evaluated.
実施例および比較例の不織布のウェットバックは、次の方法により評価した。
(1)ウェットバック量を測定するために、下記の物品を用意した。
上述の実施例および比較例の評価用吸収性物品
注入筒付きプレート(筒下部の内径2.5cm)
0.90%生理食塩水(青色染料で着色)
ろ紙(東洋濾紙(株)製ADVANTEC(登録商標)No.2)10cm×10cm
重り(5kg)10cm×10cm [Wetback]
The nonwoven fabric wetbacks of the examples and comparative examples were evaluated by the following methods.
(1) In order to measure the amount of wetback, the following articles were prepared.
Absorbent article for evaluation of the above-mentioned Examples and Comparative Examples Plate with injection cylinder (inner diameter 2.5 cm at the bottom of the cylinder)
0.90% physiological saline (colored with blue dye)
Filter paper (Toyo Filter Paper ADVANTEC (registered trademark) No. 2) 10 cm × 10 cm
Weight (5kg) 10cm x 10cm
ウェットバック量を下記の手順に従って測定した。
(i)評価用吸収性物品を、不織布(タテ42cm×ヨコ21cm)が上を向くように配置して、その上に注入筒付きプレートを乗せた。
(ii)約37℃に温めた生理食塩水50mlを筒から注入した。生理食塩水が不織布表面から見えなくなる(液体として生理食塩水が確認されなくなる)まで放置した。
(iii)注入筒付きプレートを外し、10分間静置した。
(iv)予め質量を測定したろ紙(30枚)を不織布の上に載せ、その上に5kgの重りを20秒間載せた。その後、ろ紙の質量を測定した。不織布の上に載せる前のろ紙の質量と、不織布の上に載せ、更におもりを載せた後のろ紙の質量との差が、ウェットバック量に相当する。
(vi)上記(i)に戻り、(i)~(iv)を繰り返して3回測定を行った。合計4回、ウェットバックを評価した。 (2) Method The amount of wetback was measured according to the following procedure.
(I) The absorbent article for evaluation was placed so that the nonwoven fabric (vertical 42 cm × width 21 cm) faced upward, and a plate with an injection tube was placed thereon.
(Ii) 50 ml of physiological saline warmed to about 37 ° C. was injected from the cylinder. The physiological saline was left until it disappeared from the nonwoven fabric surface (the physiological saline was not confirmed as a liquid).
(Iii) The plate with the injection tube was removed and left to stand for 10 minutes.
(Iv) Filter paper (30 sheets) whose mass was measured in advance was placed on the non-woven fabric, and a 5 kg weight was placed thereon for 20 seconds. Thereafter, the mass of the filter paper was measured. The difference between the mass of the filter paper before being placed on the nonwoven fabric and the mass of the filter paper after being placed on the nonwoven fabric and further having the weight placed thereon corresponds to the wetback amount.
(Vi) Returning to the above (i), (i) to (iv) were repeated, and measurement was performed three times. The wet back was evaluated a total of 4 times.
結果を表2~3に示した。不織布からしみ出す水分の量がより少ない方が、人の肌がよりむれないことから、ウェットバックの値は、小さい方が好ましい。 Three samples were prepared for one sample (nonwoven fabric). The average value of the wetback amount measured for each of the three samples was taken as the wetback amount of the sample.
The results are shown in Tables 2-3. The smaller the amount of moisture that exudes from the non-woven fabric, the less the human skin is peeled off.
上記ウェットバックの測定の際、生理食塩水の注入から、生理食塩水が不織布表面から見えなくなる(液体として生理食塩水が確認されなくなる)時間を計測し、吸液時間とした。
結果を表2~3に示した。より短時間で吸収する方が、人の肌がよりむれないので、吸液時間(秒)は、その値が小さい方が好ましい。 [Liquid absorption time]
During the measurement of the wet back, the time during which physiological saline was not visible from the nonwoven fabric surface (the physiological saline was no longer confirmed as a liquid) from the injection of physiological saline was measured and used as the liquid absorption time.
The results are shown in Tables 2-3. Absorbing in a shorter period of time is more difficult for human skin, so the liquid absorption time (seconds) is preferably smaller.
上記ウェットバックの測定の際、生理食塩水の注入から5分後に、評価用吸収性物品のタテ方向における生理食塩水を吸収した長さを計測し、拡散長とした。
結果を表2~3に示した。吸収性物品全体を有効に利用可能と考えられるので、拡散長(cm)の値は、大きい方が好ましい。 [Diffusion length]
At the time of measuring the wet bag, 5 minutes after the injection of the physiological saline, the length of the absorbent article for evaluation in which the physiological saline was absorbed in the vertical direction was measured to obtain a diffusion length.
The results are shown in Tables 2-3. Since it is considered that the entire absorbent article can be effectively used, the diffusion length (cm) is preferably as large as possible.
実施例3を比較例2と比較する。単層を積層にすると、2~4回目の吸液時間に関する繰り返し耐久性が大きく改良されることがわかる。
実施例1、3および4と、比較例1~3では、繊維処理剤A~Cが使用されている。繊維処理剤A~Cは、いずれも高い親水性および高い耐水性を有する。実施例のこれらの繊維処理剤を使用すると、単層を積層にすることにより、繰り返し耐久性が改良されることが判った。 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.
In Examples 1, 3 and 4 and Comparative Examples 1 to 3, 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.
Claims (7)
- 第1繊維層とその第1繊維層に隣接する第2繊維層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
第1繊維層を形成する繊維と第2繊維層を形成する繊維は、両方共、それらの繊維が水と接触してもそれらの親水性の高さの程度が維持される親水性を有し、それらの親水性は同じであり、
第1繊維層が人の肌に対向するように不織布は配置される、吸収性物品用不織布。 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 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,
The nonwoven fabric for absorbent articles, wherein the nonwoven fabric is arranged so that the first fiber layer faces human skin. - 第1繊維層とその第1繊維層に隣接する第2繊維層を有する不織布であり、
第1繊維層を形成する繊維の繊度は1.0~2.8dtexであり、
第2繊維層を形成する繊維の繊度は1.7~5.6dtexであり、
第1繊維層を形成する繊維の繊維径は、第2繊維層を形成する繊維の繊維径より小さく、
水と接触前の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(A1)と、水と接触前の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(A2)は、下記(I)を満たし、
(I):A1≦80°、A2≦80°、|A1-A2|<12
水と接触後の第1繊維層を形成する繊維の表面に対するイオン交換水の接触角(B1)と、水と接触後の第2繊維層を形成する繊維の表面に対するイオン交換水の接触角(B2)は、下記(II)を満たし、
(II):-5≦(B1-A1)<40°、-5≦(B2-A2)<40°
第1繊維層が人の肌に対向するように不織布は配置される、吸収性物品用不織布。 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 °, | A1-A2 | <12
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),
(II): −5 ≦ (B1-A1) <40 °, −5 ≦ (B2-A2) <40 °
The nonwoven fabric for absorbent articles, wherein the nonwoven fabric is arranged so that the first fiber layer faces human skin. - 前記水と接触前の接触角(A1、A2)、水と接触後の接触角(B1、B2)において、B1-A1とB2-A2の差である(B1―A1)-(B2-A2)の絶対値が下記(III)を満たす請求項2に記載の吸収性物品用不織布。
(III):|(B1-A1)-(B2-A2)|≦18 The difference between B1-A1 and B2-A2 in the contact angle (A1, A2) before contact with water and the contact angle (B1, B2) after contact with water (B1-A1)-(B2-A2) The nonwoven fabric for absorbent articles according to claim 2, wherein the absolute value of satisfies the following (III).
(III): | (B1-A1)-(B2-A2) | ≦ 18 - 第1繊維層を形成する繊維は、芯成分がポリエステル、鞘成分が高密度ポリエチレンである同心芯鞘複合繊維を含む、請求項1~3のいずれかに記載の不織布。 The nonwoven fabric according to any one of claims 1 to 3, wherein the fiber forming the first fiber layer includes a concentric core-sheath composite fiber in which the core component is polyester and the sheath component is high-density polyethylene.
- 第2繊維層の目付と第1繊維層の目付との比(第2繊維層の目付/第1繊維層の目付)が0.8~3.0である、請求項1~4のいずれかに記載の不織布。 The ratio of the basis weight of the second fiber layer to 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 0.8 to 3.0. The nonwoven fabric described in 1.
- 請求項1~5のいずれかに記載の不織布を含み、第1繊維層が人の肌に対向するように配置される、吸収性物品用トップシート。 A top sheet for absorbent articles, comprising the non-woven fabric according to any one of claims 1 to 5 and disposed so that the first fiber layer faces human skin.
- 請求項6に記載のトップシートを含み、第1繊維層が人の肌に対向するように配置される、吸収性物品。 An absorptive article comprising the top sheet according to claim 6 and arranged so that the first fiber layer faces human skin.
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CN201780020203.9A CN109069321A (en) | 2016-03-31 | 2017-03-31 | Absorbent commodity non-woven fabrics, absorbent commodity top-sheet and the absorbent commodity comprising it |
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JP7490419B2 (en) | 2019-04-09 | 2024-05-27 | 大和紡績株式会社 | Nonwoven fabric for absorbent article, top sheet for absorbent article, and absorbent article including same |
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JP2006239127A (en) * | 2005-03-03 | 2006-09-14 | Chisso Corp | Diffusing sheet for absorbing medium |
JP2015066290A (en) * | 2013-09-30 | 2015-04-13 | 大王製紙株式会社 | Absorbent article |
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JPH0261149A (en) * | 1988-08-25 | 1990-03-01 | Mitsubishi Rayon Co Ltd | Surface sheet for healthy material |
JP3416527B2 (en) * | 1998-04-20 | 2003-06-16 | ユニ・チャーム株式会社 | Stretchable nonwoven fabric for hygiene and method for producing the same |
JP4118640B2 (en) * | 2002-09-17 | 2008-07-16 | ユニ・チャーム株式会社 | Absorbent composite sheet and absorbent article using the same |
CA2507166C (en) * | 2002-12-20 | 2010-01-12 | The Procter & Gamble Company | Tufted laminate web |
JP4566051B2 (en) * | 2004-04-15 | 2010-10-20 | 花王株式会社 | Absorbent article surface sheet |
JP4301999B2 (en) * | 2004-05-07 | 2009-07-22 | 花王株式会社 | Absorbent articles |
JP4566059B2 (en) * | 2005-04-28 | 2010-10-20 | 花王株式会社 | Absorbent article surface sheet |
JP5184966B2 (en) * | 2008-05-20 | 2013-04-17 | 花王株式会社 | Absorbent articles |
US20120238979A1 (en) * | 2011-03-15 | 2012-09-20 | Paul Thomas Weisman | Structured Fibrous Web |
JP6505493B2 (en) * | 2014-04-18 | 2019-04-24 | ダイワボウホールディングス株式会社 | Composite staple fiber for absorbent article, method for producing the same, and heat-bonded nonwoven fabric for absorbent article containing the same, and absorbent article |
JP6397210B2 (en) * | 2014-04-18 | 2018-09-26 | ダイワボウホールディングス株式会社 | Absorbent article surface sheet and absorbent article including the same |
-
2017
- 2017-03-31 KR KR1020187031218A patent/KR20180131582A/en not_active Application Discontinuation
- 2017-03-31 CN CN201780020203.9A patent/CN109069321A/en active Pending
- 2017-03-31 WO PCT/JP2017/013641 patent/WO2017171017A1/en active Application Filing
- 2017-03-31 JP JP2018509662A patent/JPWO2017171017A1/en active Pending
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- 2022-07-26 JP JP2022118698A patent/JP7433583B2/en active Active
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Patent Citations (2)
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JP2006239127A (en) * | 2005-03-03 | 2006-09-14 | Chisso Corp | Diffusing sheet for absorbing medium |
JP2015066290A (en) * | 2013-09-30 | 2015-04-13 | 大王製紙株式会社 | Absorbent article |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7490419B2 (en) | 2019-04-09 | 2024-05-27 | 大和紡績株式会社 | Nonwoven fabric for absorbent article, top sheet for absorbent article, and absorbent article including same |
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JP7433583B2 (en) | 2024-02-20 |
JP2024026636A (en) | 2024-02-28 |
KR20180131582A (en) | 2018-12-10 |
CN109069321A (en) | 2018-12-21 |
JPWO2017171017A1 (en) | 2019-02-14 |
JP2022136194A (en) | 2022-09-15 |
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