WO2020044967A1 - Article absorbant - Google Patents

Article absorbant Download PDF

Info

Publication number
WO2020044967A1
WO2020044967A1 PCT/JP2019/030677 JP2019030677W WO2020044967A1 WO 2020044967 A1 WO2020044967 A1 WO 2020044967A1 JP 2019030677 W JP2019030677 W JP 2019030677W WO 2020044967 A1 WO2020044967 A1 WO 2020044967A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
top sheet
acid
absorbent article
water
Prior art date
Application number
PCT/JP2019/030677
Other languages
English (en)
Japanese (ja)
Inventor
宏樹 松岡
有一 山下
Original Assignee
大王製紙株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2020044967A1 publication Critical patent/WO2020044967A1/fr

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—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
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer

Definitions

  • the present invention relates to an absorbent article in which a top sheet is composed of a plurality of layers, and among the plurality of layers, a layer located on the skin side does not contain an acid, and a layer located on the back side contains an acid. Things.
  • the stool and urine excreted by the wearer of the absorbent article are absorbed by the absorbent article.
  • the pH of the site that has absorbed stool or urine changes according to the elapsed time after excretion. For example, when urine is excreted, the pH at the absorption site immediately after excretion is often about 6.5. Over time, urea in urine is decomposed by hydrolytic enzymes (eg, urease) to produce ammonia. As a result, the pH of the absorption site is inclined toward the alkali side, and may be about pH 11.
  • ⁇ Prolonged contact between the wearer's skin and the alkaline absorption site places a burden on the skin.
  • a newborn child a child at a low age
  • has a thin skin layer so that a burden is more likely to be applied to the skin than an adult.
  • a convex portion is provided on a topsheet, and a weak acidifying agent is contained in the top portion and the side wall portion of the convex portion so that the fiber density of the side wall portion is smaller than the fiber density of the top portion.
  • a certain amount of the discharge liquid remains as a residual liquid on the side wall part having a small fiber density. It is stated that the pH of the projections can be maintained weakly acidic.
  • the absorbent article of Patent Document 2 is provided with a fumaric acid-containing sheet containing fumaric acid on a sheet base material mainly composed of paper, and the fumaric acid content in the fumaric acid-containing sheet is 0.00015 mass % To 1.5% by mass. According to this absorbent article, it is possible to prevent skin irritation of the wearer, suppress the propagation of various bacteria after excretion, and suppress the generation of offensive odors, thereby maintaining the antibacterial and deodorizing effects for a long time.
  • Patent Document 3 discloses an absorbent article in which a weakly acidic pulp is blended as a raw material of an absorber, an antibacterial high-absorbency polymer is mixed with the absorber, and citric acid composed of granular material is sprayed on the absorber. A liquid permeable sheet impregnated with malic acid is disposed above the sheet. According to this absorbent article, due to the synergistic effect of “weakly acidic pulp”, “antibacterial superabsorbent polymer”, “citric acid” and “malic acid”, wearing for a long time cannot be obtained alone or in partial combination It is said that the deodorizing effect at the time can be dramatically improved.
  • Patent Documents 1 to 3 have the following problems.
  • the absorbent article described in Patent Literature 1 it is necessary to provide a convex portion on the topsheet, and the mixing site of the weak acidifying agent is also limited, so that the structure of the absorbent article is limited and the manufacturing method is simplified. There is a problem that it is difficult.
  • Patent Document 2 uses a sheet impregnated with fumaric acid.
  • fumaric acid is hardly dissolved in water, it is difficult to apply fumaric acid to a fiber together with a hydrophilic agent, There is a problem that it is difficult to manufacture.
  • an object of the present invention is to provide an absorbent article that can reduce the burden on the skin of a wearer.
  • the top sheet contains an acid.
  • This top sheet has a special property of directly touching the wearer's skin, unlike the intermediate sheet and the packaging sheet. Therefore, it is particularly important to prevent the excrement attached to the top sheet from leaning toward the alkali side. Therefore, by adding acid to the top sheet, it is possible to prevent the top sheet from tilting toward the alkali side, and it is possible to reduce the burden on the wearer's skin. For example, when a wearer urinates, urea contained in urine is decomposed into ammonia by urease, and the ammonia in the top sheet can neutralize the ammonia.
  • the top sheet touches the skin of the wearer, the acid contained in the top sheet may put a burden on the skin of the wearer. Therefore, the top sheet is composed of a plurality of layers, and the layer located on the skin side does not contain acid, thereby preventing the acid from imposing a load on the wearer's skin.
  • the acid contained in the top sheet is a water-soluble acid
  • the acid contained in the top sheet is preferably a water-soluble acid. This is because the poorly soluble acid has a low affinity for the hydrophilic agent and is hard to adhere to the fibers constituting the top sheet.
  • the action of the hydrophilic agent contained in the top sheet makes it difficult for water-soluble acids to flow down from the top sheet.
  • the water-soluble acid is chemically bonded to the hydrophilic agent and becomes a structure held between the fibers constituting the top sheet, even when urinating repeatedly, the water-soluble acid is produced by the action of the hydrophilic agent. Acid is less likely to run off.
  • Such a topsheet can be manufactured, for example, by applying a water-soluble acid and a hydrophilic agent to the fibers constituting the topsheet.
  • the wearer performs excretion a plurality of times, the state in which the water-soluble acid is retained in the top sheet is maintained, so that the alkali side of the excrement remaining inside the top sheet Can be continuously suppressed.
  • the hydrophilic agent prevents water-soluble acid from flowing down from the top sheet due to excretion, the water-soluble acid and the hydrophilic agent are preferably provided at the same position on the top sheet in plan view.
  • the top sheet is made of a hydrophobic fiber
  • a hydrophilic agent in the top sheet as in this embodiment, such stagnation of excrement can be prevented, and the excrement can quickly reach the absorber.
  • the hydrophilic agent comprises a polyglycerin fatty acid ester, a polyether-polyester block copolymer, a polyether-modified silicone or a fatty acid ester of an ethylene oxide-added polyhydric alcohol, or a combination thereof.
  • the hydrophilic agent contained in the top sheet preferably has a high effect of preventing the water-soluble acid from flowing down.
  • Polyglycerol fatty acid esters, polyether-polyester block copolymers, polyether-modified silicones and fatty acid esters of ethylene oxide-added polyhydric alcohols may be used alone or in combination as the hydrophilic agent having such a high effect. May be used. Further, a combination of any one of these substances and another known substance may be used.
  • the top sheet containing the water-soluble acid and the hydrophilic agent In the drop test of artificial urine, the first or second measurement result is 10 points, the second measurement result is 10 points, and the third measurement result is 9 points or more. 3.
  • the top sheet is composed of a plurality of layers, of which the layer located on the skin side does not contain a water-soluble acid, and the layer located on the back side contains a water-soluble acid
  • a top sheet was prepared, and a drop test of artificial urine was performed on the top sheet.
  • the first measurement result was 10 points
  • the second measurement result was 10 points
  • the third measurement result was 9 points. It is good to use the above-mentioned top sheet for an absorbent article. This is because, even when the wearer excretes a plurality of times, the water-soluble acid and hydrophilic agent hardly flow down from the top sheet, so that the burden on the wearer's skin can be reduced for a long period of time. .
  • the conditions such as the number and thickness of layers of the top sheet used for the artificial urine drop test, the fiber material of the top sheet, and the manufacturing method are all the same as the top sheet actually mounted on the absorbent article. I do.
  • the drop test of artificial urine is performed according to the following procedures (1) to (4).
  • ⁇ Drip test of artificial urine> (1) The top sheet is placed on ten filter papers, and a metal jig having ten holes is placed on the top sheet. (2) 1 mL of artificial urine was dropped into each of the 10 holes of the metal jig using a micropipette, and within 2 seconds, the top sheet absorbed the artificial urine within 2 seconds. It is checked whether or not the hole is absorbed, and one hole that has been absorbed is counted as one point, and a hole that is not absorbed is counted as zero point, and the total score of the ten holes is recorded as the first measurement result.
  • the artificial urine used in the artificial urine drop test was composed of 2% by weight of urea, 0.8% by weight of sodium chloride, 0.03% by weight of calcium chloride dihydrate, 0.08% by weight of magnesium sulfate heptahydrate, It is a mixture of 97.09 wt% of exchanged water.
  • the metal jig used for the drop test of the artificial urine was a rectangle having a width of 210 mm, a length of 50 mm, and a thickness of 5 mm, and each hole was a circle having a diameter of 15 mm, and an interval of 4 mm in the width direction and the length direction. Are provided at regular intervals while leaving a space, and the weight is 400 g.
  • An intermediate sheet is provided between the top sheet and the absorber, The absorbent article according to any one of the first to fourth aspects, wherein the intermediate sheet contains a hydrophilic agent together with a water-soluble acid.
  • the intermediate sheet does not directly contact the wearer's skin, excrement may remain in the intermediate sheet when the wearer excretes. Then, when the excrement in the intermediate sheet is alkalized and returns to the skin side of the top sheet (the excrement in the intermediate sheet moves to the skin side of the top sheet), it touches the wearer's skin, A burden is placed on the wearer's skin. Therefore, by adding a water-soluble acid to this intermediate sheet, it is possible to prevent a burden on the wearer's skin.
  • the intermediate sheet is often bulkier than the top sheet or the packaging sheet. Therefore, the amount of excrement remaining in the intermediate sheet tends to be larger than that of the top sheet or the packaging sheet. Therefore, when the reversion phenomenon is taken into consideration, including a water-soluble acid in the intermediate sheet containing a large amount of excrement is more advantageous than including a water-soluble acid in the packaging sheet. Also, since the intermediate sheet is located closer to the skin than the packaging sheet, from this point, including the water-soluble acid in the intermediate sheet closer to the skin is more effective than including the water-soluble acid in the packaging sheet. The benefits are also high.
  • a packaging sheet wrapping the absorber is provided, The absorbent article according to any one of the first to fifth aspects, wherein the packaging sheet contains a hydrophilic agent together with a water-soluble acid.
  • the packaging sheet does not directly touch the wearer's skin, excrement may remain in the packaging sheet when the wearer excretes. Then, when the excrement in the packaging sheet is alkalized and returns to the skin side of the top sheet (the excrement in the packaging sheet moves to the skin side of the top sheet), it touches the wearer's skin, A burden is placed on the wearer's skin. Therefore, by adding a water-soluble acid to this packaging sheet, it is possible to prevent a burden on the wearer's skin. Also, in general, the packaging sheet has many opportunities to come into contact with the absorbent holding the excrement. That is, since the water-soluble acid contained in the packaging sheet acts on the excrement held by the absorber, the effect of suppressing the inclination of the excrement toward the alkali side is high.
  • the fiber diameter of such a top sheet is preferably at least 4.0 dtex, more preferably at least 5.0 dtex.
  • the top sheet is composed of a plurality of layers and the fiber diameter of the layer located on the skin side is reduced, the feel is improved, so that the burden on the wearer's skin can be reduced. Further, by increasing the fiber diameter of the layer located on the back side, the same operation and effect as in the seventh embodiment can be obtained.
  • the fiber aspect of the layer located on the skin side is 2.5 dtex or less and the fiber diameter of the layer located on the back side is 4.0 dtex or more. 3.
  • the top sheet is composed of a plurality of layers and the fiber diameter of the layer located on the skin side is reduced, the feel is improved, so that the burden on the wearer's skin can be reduced. Further, by increasing the fiber diameter of the layer located on the back side, the same operation and effect as those described in the seventh aspect can be obtained.
  • the fiber diameter of the layer located on the skin side is preferably 2.5 dtex or less, more preferably 1.7 dtex or less. Further, the fiber diameter of the layer located on the back side is preferably at least 4.0 dtex, more preferably at least 5.0 dtex.
  • An intermediate sheet is provided between the top sheet and the absorber, The absorbent article according to any one of claims 1 to 9, wherein the weight of the intermediate sheet is 20 gsm or more.
  • the basis weight of the intermediate sheet is preferably 20 gsm or more, more preferably 30 gsm or more.
  • a packaging sheet wrapping the absorber is provided, The absorbent article according to any one of the first to tenth aspects, wherein the weight of the packaging sheet is 20 gsm or more.
  • the intermediate sheet is made thicker to prevent reversion, but the same effect can be obtained by making the packaging sheet thicker.
  • the basis weight of the packaging sheet is preferably 20 gsm or more, and more preferably 30 gsm or more.
  • Citric acid is preferable because it is highly safe as it is used as a food additive and has a high effect of inhibiting alkalinization.
  • the burden on the skin of the wearer can be reduced.
  • FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in a state where the diaper is developed.
  • FIG. 6 is a sectional view taken along line 6-6 of FIG.
  • FIG. 7 is a sectional view taken along line 7-7 of FIG. 1.
  • 9A is a sectional view taken along line 8-8 of FIG. 1
  • FIG. 9B is a sectional view taken along line 9-9 of FIG. It is a graph showing an experimental result. Changes in pH when 100 ⁇ L of artificial urine is dripped three times at measurement points A to C and G to I are shown. It is a graph showing an experimental result.
  • the top sheet 30, the intermediate sheet 40, the packaging sheet 58, the absorber 56, the liquid impermeable sheet 11, and the exterior nonwoven fabric 12 are bonded with a hot melt adhesive.
  • the hot melt adhesive is formed by a known method such as slot coating, continuous linear or dotted linear bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). Can be applied.
  • a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member.
  • the hot melt adhesive include EVA-based adhesives, adhesive rubber-based (elastomer-based), olefin-based, and polyester / polyamide-based adhesives, but they can be used without any particular limitation.
  • a joining means for joining the constituent members means by material welding such as heat sealing or ultrasonic sealing can be used.
  • This tape-type disposable diaper has a ventral portion F extending forward from the center in the front-back direction LD and a back portion B extending rearward from the center in the front-back direction LD.
  • the tape-type disposable diaper includes an absorbent body 56 incorporated in a range including the crotch portion, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and a liquid impermeable covering the back side of the absorbent body 56. It has a sheet 11 and an exterior nonwoven fabric 12 that covers the back side of the liquid impermeable sheet and constitutes the outer surface of the product.
  • the absorber 56 is a portion that absorbs and retains the excreted liquid, and can be formed by an aggregate of fibers.
  • the fiber aggregate include a filament aggregate obtained by spreading a tow (fiber bundle) of synthetic fibers such as cellulose acetate, as necessary, in addition to fibers obtained by stacking short fibers such as cotton-like pulp and synthetic fibers.
  • the fiber basis weight can be, for example, about 100 to 300 g / m 2 when stacking cottony pulp or short fibers, and about 30 to 120 g / m 2 for filament aggregates, for example. Can be.
  • the fineness of the synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
  • the filament may be a non-crimped fiber, but is preferably a crimped fiber.
  • the degree of crimp of the crimped fiber can be, for example, about 5 to 75 pieces, preferably about 10 to 50 pieces, more preferably about 15 to 50 pieces per 2.54 cm. Further, crimped fibers uniformly crimped can be used.
  • the absorber 56 can contain superabsorbent polymer particles in a part or the whole thereof.
  • the superabsorbent polymer particles include “powder” in addition to “particles”.
  • the superabsorbent polymer particles those used for this type of absorbent article can be used as they are.
  • the particle size of the superabsorbent polymer particles is not particularly limited, for example, sieving using a standard sieve of 500 ⁇ m (JIS Z8801-1: 2006) (shaking for 5 minutes), and particles falling under the sieving by this sieving
  • a standard sieve of 500 ⁇ m JIS Z8801-1: 2006
  • the percentage of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less
  • the 180 ⁇ m standard sieve is used. It is desirable that the ratio of the particles remaining on the top is 60% by weight or more.
  • the material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are preferred.
  • the superabsorbent polymer particles include starch-based, cellulosic and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and crosslinking of sodium carboxymethyl cellulose. Or an acrylic acid (salt) polymer can be used.
  • the shape of the superabsorbent polymer particles is preferably in the form of a commonly used powder, but other shapes can also be used.
  • the superabsorbent polymer particles those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are suitably used. If the water absorption speed is too slow, the so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 easily occurs.
  • the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. Thereby, even when the bulky absorber 56 is used, the sticky feeling after absorbing the liquid can be effectively suppressed.
  • the basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be 50 to 350 g / m 2 .
  • the basis weight of the polymer is less than 50 g / m 2, it is difficult to secure the absorption amount. If it exceeds 350 g / m 2 , not only the effect is saturated, but also an excessive amount of the superabsorbent polymer particles gives a jarring and uncomfortable feeling.
  • the absorber 56 can be incorporated as an absorbing element 50 wrapped in a wrapping sheet 58.
  • tissue paper particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, or the like can be used.
  • a sheet from which the superabsorbent polymer particles do not escape is desirable.
  • hydrophilic SMMS spunbond / meltblown / meltblown / spunbond
  • polypropylene, polyethylene / polypropylene or the like can be used as the material.
  • the packaging sheet 58 may be configured to wrap the entirety of the absorber 56 in a single sheet, or may be configured to wrap the entirety of the absorber 56 in a plurality of upper and lower sheets.
  • the packaging sheet 58 can be omitted.
  • the weight of the packaging sheet 58 is preferably 16 gsm or more, and more preferably 20 gsm or more.
  • the top sheet 30 has liquid permeability, and for example, a perforated or non-porous nonwoven fabric, a porous plastic sheet, or the like can be used.
  • the non-woven fabric is not particularly limited in its raw material fiber.
  • olefins such as polyethylene and polypropylene, polyesters, synthetic fibers such as polyamides, regenerated fibers such as rayon and cupra, and mixed fibers using two or more of these, composite fibers, and the like. it can.
  • the nonwoven fabric may be manufactured by any processing.
  • processing method examples include known methods, for example, a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method, and the like.
  • a spunlace method is preferred for flexibility and drapability
  • a thermal bonding method is a preferred processing method for bulkiness and softness.
  • the top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, and extends laterally beyond the absorber 56 in the width direction WD.
  • the starting point of the rising gathers 60 described later is closer than the side edge of the absorber 56.
  • the top sheet 30 can be appropriately deformed, for example, the width of the top sheet 30 is shorter than the entire width of the absorber 56.
  • the fiber diameter of the top sheet 30 can be arbitrarily determined, but is preferably 4.0 dtex or more, and more preferably 5.0 dtex or more. In this manner, by increasing the fiber diameter of the top sheet 30, excrement can be rapidly absorbed. As a result, the time during which the excrement is in contact with the wearer's skin can be reduced. In addition, since excrement can be prevented from accumulating on the surface of the top sheet 30 and spreading over a wide area, the area where the excrement adheres to the wearer's skin can be reduced. Thereby, the burden on the skin due to the inclination of the excrement attached to the top sheet 30 toward the alkali side can be reduced.
  • the top sheet 30 is composed of a plurality of layers, and the fiber diameter of the layer located on the skin side is smaller than the fiber diameter of the layer located on the back side.
  • the fiber diameter of the layer located on the skin side among the plurality of layers of the top sheet 30 is preferably set to 2.5 dtex or less, more preferably 1.7 dtex or less. Further, the fiber diameter of the layer located on the back side is preferably at least 4.0 dtex, more preferably at least 5.0 dtex. By setting the fiber diameter in such a range, the wearer can easily feel that the skin feels good, and the excrement can be quickly absorbed.
  • an intermediate sheet (also referred to as a “second sheet”) 40 having a higher liquid permeation speed than the top sheet 30 can be provided.
  • the intermediate sheet 40 is provided for quickly transferring the liquid to the absorber 56 to enhance the absorption performance of the absorber 56 and preventing the "return” phenomenon of the absorbed liquid from the absorber 56.
  • the intermediate sheet 40 can be omitted.
  • the same material as the top sheet 30, spunlace nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point bonded nonwoven fabric, or crepe paper can be exemplified.
  • an air-through nonwoven fabric is preferable because it is bulky.
  • the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
  • the thickness of the raw material fiber of the nonwoven fabric is preferably 2.0 to 10 dtex.
  • the intermediate sheet 40 in the illustrated example is arranged at the center shorter than the width of the absorber 56, but may be provided over the entire width.
  • the intermediate sheet 40 may be provided over the entire length of the diaper, or may be provided only in the intermediate portion including the excretion position as shown in the figure.
  • the weight of the intermediate sheet 40 is preferably 20 gsm or more, and more preferably 30 gsm or more.
  • a reversion phenomenon may occur in which the excrement held by the absorber 56 moves to the skin side.
  • the amount of excrement that returns may be reduced.
  • the weight of the intermediate sheet 40 be made thick to prevent reversal, thereby reducing such a burden.
  • the liquid impermeable sheet 11 is not particularly limited, but preferably has moisture permeability.
  • a microporous material obtained by kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction.
  • a sheet can be suitably used.
  • a sheet having a non-woven fabric as a base material and having improved waterproofness can be used as the liquid impermeable sheet 11.
  • the liquid impermeable sheet 11 preferably extends over the same or a wider range as the absorber 56 in the front-rear direction LD and the width direction WD, but if necessary, such as when other water shielding means is present,
  • the structure which does not cover the end part of the absorber 56 in the front-back direction LD and the width direction WD can also be used.
  • the exterior nonwoven fabric 12 covers the entire back side of the liquid impermeable sheet 11 so that the outer surface of the product has a cloth-like appearance.
  • the exterior nonwoven fabric 12 is not particularly limited, and examples of the material fibers include olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, synthetic fibers such as polyamide-based fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton.
  • a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used as a processing method.
  • a long-fiber nonwoven fabric such as a spunbonded nonwoven fabric, an SMS nonwoven fabric, and an SMMS nonwoven fabric is preferable from the viewpoint that both touch and strength can be achieved.
  • the nonwoven fabric may be used alone or in a plural number. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot melt adhesive or the like.
  • the basis weight of the fiber is preferably from 10 to 50 g / m 2 , particularly preferably from 15 to 30 g / m 2 .
  • rising gathers 60 that stand on the skin side of the wearer are provided on both sides in the width direction WD of the surface. Is preferable. Of course, the rising gathers 60 can be omitted.
  • the rising gather 60 in the illustrated example includes a gather sheet 62 substantially continuous in the width direction WD, and an elongated gather elastic member 63 fixed to the gather sheet 62 in an extended state along the front-back direction LD. ing.
  • a gather sheet 62 a water-repellent nonwoven fabric can be used, and as the gather elastic member 63, thread rubber or the like can be used.
  • a plurality of elastic members may be provided, or one elastic member may be provided.
  • the inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side portion of the top sheet 30, and a portion outside in the width direction from the joining start end is an inner surface of each side flap portion SF, that is, in the illustrated example, liquid impermeable.
  • the side surface of the non-woven sheet 11 and the side portion of the exterior nonwoven fabric 12 located on the outer side in the width direction are joined by a hot melt adhesive or the like.
  • the inner side in the width direction from the joining start end of the rising gathers 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion between them is a non-fixed free portion.
  • the elastic member 63 rises due to the contracting force and comes into close contact with the body surface.
  • the tape-type disposable diaper of the illustrated example has a pair of end flap portions EF that do not have the absorber 56 and extend to the front side and the rear side of the absorber 56, respectively, and are located laterally beyond both side edges of the absorber 56. It has a pair of side flap portions SF that do not have the absorber 56 and extend.
  • the side flap portion SF may be made of a material (exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56 as shown in the illustrated example, or may be formed by attaching another material.
  • a side elastic member 64 made of an elongated elastic member such as thread rubber is fixed in a state of being extended along the front-back direction LD.
  • the side elastic member 64 is provided between the gather sheet 62 and the liquid impermeable sheet 11 on the outer side in the width direction near the joining start end of the joining portion of the gather sheet 62 as shown in the illustrated example.
  • the liquid impermeable sheet 11 and the exterior nonwoven fabric 12 may be provided.
  • a plurality of side elastic members 64 may be provided on each side as shown in the illustrated example, or only one side elastic member 64 may be provided on each side.
  • the plane gather is a portion where the contraction force of the side elastic member 64 acts (a portion where the side elastic member 64 is shown in the drawing). Therefore, in addition to the form in which the side elastic member 64 exists only in the portion of the flat gather, the side elastic member 64 exists on the front side, the rear side, or both sides of the flat gather, but the side elastic member is provided in other portions than the flat gather. When the member is finely cut at one or many places, or is not fixed to the sheet sandwiching the side elastic member 64, or both, a contraction force acts on a portion other than the flat gather. However, there is also included a structure in which the contraction force of the side elastic member 64 acts only on the portion of the flat gathers (substantially equivalent to not providing the elastic member).
  • connection tape The side flap portions SF in the back portion B are provided with connection tapes 13 which are detachably connected to the outer surface of the abdomen portion F.
  • the connecting tape 13 is turned from both sides of the waist to the outer surface of the abdominal portion F, and the connecting portion 13A of the connecting tape 13 is connected to an appropriate position on the outer surface of the abdominal portion F.
  • the connecting tape 13 includes a base end portion 13C fixed to the side flap portion SF, and an extending portion 13B extending outward from the base end portion 13C in the width direction WD.
  • the extending portion 13B has a sheet base, and a connecting portion 13A provided at an intermediate portion in the width direction of the sheet base and connected to the abdominal outer surface, and a portion on the tip side of the connecting portion 13A is a knob. It has become.
  • a hook material (male material) of a mechanical fastener (surface fastener) may be provided, or an adhesive layer may be provided.
  • the hook member has a large number of engaging projections on its connection surface.
  • the shape of the engaging projection is (A) L-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are a T-shape, (E) a double J-shape (a shape in which J-shapes are joined back to back) and the like, but any shape may be used.
  • a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper or a composite material thereof can be used, but the fineness is 1.0 to 3.5 dtex and the basis weight is small.
  • a spunbond nonwoven fabric, an air-through nonwoven fabric, or a spunlace nonwoven fabric having a thickness of 20 to 100 g / m 2 and a thickness of 1 mm or less is preferable.
  • the target portion can be provided by attaching a target sheet 20 for facilitating connection to the outer surface of the abdominal portion F as in the illustrated example.
  • the connecting portion 13A is a hook material
  • the target sheet 20 can be a sheet material in which a large number of loop yarns in which the engaging projections of the hook material are entangled are provided on the surface of a sheet substrate made of a plastic film or a nonwoven fabric.
  • the pressure-sensitive adhesive layer a layer obtained by subjecting a surface of a sheet substrate made of a plastic film having a smooth surface to have high adhesion to a release treatment can be used.
  • the connecting portion of the connecting tape 13 in the abdominal portion F is made of non-woven fabric
  • the target sheet 20 is omitted, and the hook material is replaced with the fibers of the outer non-woven fabric 12. It can also be entangled and connected.
  • a mark may be printed on the outer surface of the exterior nonwoven fabric 12 or the liquid impermeable sheet 11.
  • the present tape-type disposable diaper has a crotch portion M extending from the middle of the abdominal portion F in the front-rear direction LD to the middle of the back portion B in the front-rear direction LD.
  • the abdominal part F and the back part B have wing parts WP extending outward in the width direction WD from the crotch part M.
  • the lower edge of the wing portion of the abdominal portion F extends so as to be positioned diagonally outward from the front end of the side edge of the crotch portion M toward the front, and the lower edge of the wing portion of the back portion B is a crotch portion.
  • the rear edge of the side edge of M extends rearward from the rear end so as to be positioned obliquely outward.
  • the side edge of the wing portion WP is straight in the illustrated example, but is not limited to this, and another known shape can be adopted.
  • the dimensions of the longitudinal direction LD of the crotch portion M may be appropriately determined, but may be 1.2 to about 1.4 times the minimum width M X crotch portion M.
  • the dimensions M Y in the longitudinal direction LD of the crotch portion M is about 10 ⁇ 30 cm.
  • the top sheet 30 of the absorbent article contains a water-soluble acid. It is preferable that the top sheet 30 further include a hydrophilic agent. It is preferable that not only the top sheet 30 but also one of the intermediate sheet 40 and the packaging sheet 58 or both the intermediate sheet 40 and the packaging sheet 58 contain a water-soluble acid. Also in this case, it is preferable to include a hydrophilic agent together with the water-soluble acid.
  • the water-soluble acid (and hydrophilic agent) contained in the top sheet 30 will be described. However, the same applies to the intermediate sheet 40 and the packaging sheet 58 unless otherwise specified.
  • the water-soluble acid can be used without any particular limitation, but those having a pH of 2 to 4 are preferred.
  • the pH value is smaller than 2, there is a disadvantage that a load is applied to the skin when the acid adheres to the wearer's skin. Further, when the pH value is higher than 4, there is a disadvantage that it is difficult to effectively prevent the excrement from leaning toward the alkali side.
  • Specific examples of the water-soluble acid include citric acid, tartaric acid, malic acid, lactic acid and the like. Particularly, highly safe citric acid and lactic acid used as food additives are suitable.
  • This water-soluble acid is preferably fixed by applying it to fibers constituting the top sheet 30 in order to prevent the acid component from flowing down to the absorber side even when urinating repeatedly.
  • the diaper may be fixed to the top sheet 30 by another method such as spray coating inline at the time of manufacturing the diaper.
  • the water-soluble acid is fixed in the gap between the fibers constituting the nonwoven fabric without using a chemical bond. Therefore, the urine flows down from the non-woven fabric together with the urine due to urination. Therefore, it is preferable that a water-soluble acid is applied to the nonwoven fabric together with the hydrophilic agent so that it does not easily flow down even when urination is repeated.
  • the hydrophilic agent used in the above-mentioned applications can be used without any particular limitation, and examples thereof include various surfactants (anionic, cationic, zwitterionic and nonionic) as typical ones.
  • various surfactants anionic, cationic, zwitterionic and nonionic
  • polyglycerin fatty acid ester, polyether-polyester block copolymer, polyether-modified silicone, fatty acid ester of ethylene oxide-added polyhydric alcohol, and the like can be used.
  • the diaper may be fixed to the top sheet 30 by another method such as in-line spray coating during diaper production.
  • the topsheet 30 manufactured as described above has a state in which a water-soluble acid is attached to the outer surface of the fiber constituting the topsheet 30. At the same time, the space between the plurality of fibers constituting the top sheet 30 may be filled with a water-soluble acid. Further, it is preferable that the water-soluble acid is made to permeate into the fiber itself constituting the top sheet 30 because the water-soluble acid hardly flows down even after a plurality of excretions.
  • the following artificial urine drop test was performed on the top sheet 30 containing a water-soluble acid and a hydrophilic agent, and the first measurement result was 10 points, the second measurement result was 10 points, and the third measurement result was obtained. It is preferable to mount the top sheet 30 having 9 or more measurement results on the absorbent article.
  • Drip test method for artificial urine (1) A top sheet 30 containing a hydrophilic agent is placed on ten filter papers, and a metal jig 70 having ten holes is placed on the top sheet 30. In addition, this test is for confirming whether or not the hydrophilic agent contained in the top sheet 30 is difficult to flow down when repeatedly excreted. Need not be included.
  • a filter paper 250 mm ⁇ 250 mm square manufactured by ADVENTEC As the filter paper used in the test, for example, a filter paper 250 mm ⁇ 250 mm square manufactured by ADVENTEC can be used.
  • Metal jig The following is used as the metal jig 70. It has a rectangular shape with a width of 210 mm, a length of 50 mm, and a thickness of 5 mm, and ten holes 71 having a diameter of 15 mm are provided at regular intervals, with a spacing of 4 mm in the width direction and the length direction.
  • the weight is 400g.
  • Artificial urine The following are used as artificial urine used in the test.
  • About 5 g of Kiriya's Food Blue No. 1 (Brilliant Blue FCF) (package: powder) is dissolved and adjusted in about 300 ml of the above-mentioned artificial urine.
  • (pipette) As the micropipette used in the drop test of the artificial urine, for example, Biohit Proline Pipette 100 to 1000 ⁇ l (model number: 720050) can be used. Further, as a glass pipette used for the drop test of the artificial urine, for example, 5 ml of KOMA5 (model number: 0801-04) manufactured by Maruem can be used.
  • the hydrophilic agent is attached to the outer surface of the fiber constituting the top sheet 30 together with the water-soluble acid.
  • the space between the plurality of fibers constituting the top sheet 30 may be filled with a hydrophilic agent together with a water-soluble acid. Further, when the water-soluble acid and hydrophilic agent are infiltrated into the fiber itself constituting the top sheet 30, the water-soluble acid and hydrophilic agent are less likely to flow down even after a plurality of excretions. The effect of continuously suppressing the inclination toward the alkali side is high.
  • the topsheet 30 contains a hydrophilic agent.
  • the water-soluble acid is firmly fixed to the fibers constituting the top sheet 30, and the water-soluble acid does not easily flow down even after a plurality of excretions, and the excrement is continuously inclined to the alkali side. Can be deterred.
  • the amount of the water-soluble acid added to the top sheet 30 is preferably 0.02% to 0.07%, and more preferably 0.03% to 0.05%.
  • the amount is more than 0.07%, there is a disadvantage that a load is applied to the skin when the acid adheres to the wearer's skin.
  • the amount is less than 0.02%, there is a disadvantage that it is difficult to effectively prevent the excrement from leaning toward the alkali side.
  • the blending amount of the hydrophilic agent with respect to the top sheet 30 is preferably 0.3% to 0.5%, and more preferably 0.4% to 0.5%.
  • the compounding amount is more than 0.5%, there is a disadvantage in that a drug cost is increased, a product cost is increased, and when the wearer's body pressure is applied after urination, it is easy to return.
  • the amount is less than 0.3%, the bond between the water-soluble acid and the fibers constituting the top sheet 30 is weakened, and the water-soluble acid easily flows down by excretion a plurality of times.
  • urine may not pass through the nonwoven fabric, leading to leakage.
  • the mixing ratio of the water-soluble acid and the hydrophilic agent is preferably from 1: 7 to 1:20, more preferably 1:15. Exceeding this range has the disadvantage of affecting the hydrophilicity of the nonwoven fabric.
  • the effect of reducing the burden on the wearer's skin is high. Since the top sheet 30 directly touches the wearer's skin (for example, the skin of the buttocks), if the excrement attached to the top sheet 30 due to excretion is inclined to the alkali side, the skin and the excrement are continuously generated. The contact puts a burden on the skin. Therefore, by including a water-soluble acid in the top sheet 30, the inclination to the alkali side can be suppressed, and the burden on the skin of the wearer can be reduced.
  • the acid contained in the top sheet 30 may put a burden on the wearer's skin. It is possible to reduce the burden on the skin by the acid by using a near neutral acid or by reducing the amount of acid added, but in this case, the inclination of the excrement toward the alkali side cannot be effectively suppressed. There is a negative effect. Therefore, in order to solve such a problem, the top sheet 30 has a multi-layered structure, and the layer located on the skin side does not contain a water-soluble acid (or, if contained, a small amount). Preferably, the layer located on the back side contains a water-soluble acid and a hydrophilic agent.
  • the top sheet 30 has a two-layer structure so that the layer on the skin side (upper layer) does not contain a water-soluble acid and the layer on the back side (lower layer) contains a water-soluble acid and a hydrophilic agent.
  • the top sheet 30 has a structure of three or more layers, the layer closest to the skin side (the top layer) does not contain a water-soluble acid, and any of the layers located on the back side of the top layer or It is preferred that all layers contain a water-soluble acid and a hydrophilic agent.
  • FIG. 3 illustrates an example in which the top sheet 30 has a two-layer structure.
  • the layer on the skin side (upper layer) is indicated by 30U, and the layer on the back side (lower layer) is indicated by 30D.
  • the upper layer 30U does not contain a water-soluble acid and a hydrophilic agent
  • the lower layer 30D contains a water-soluble acid and a hydrophilic agent.
  • the upper layer 30U does not contain a water-soluble acid.
  • the hydrophilic agent does not burden the skin, and may be included in the upper layer 30U.
  • a layer of the top sheet 30 located on the skin side may be made of a water-soluble acid. It is also effective to dare to include
  • the topsheet 30 having a special structure as in the present invention that is, the topsheet 30 in which the upper layer 30U does not contain a water-soluble acid and the lower layer 30D contains a water-soluble acid is, for example, as follows: (1) or (2).
  • (1) raw cotton (fiber as a raw material; hereinafter the same) as a raw material of a layer located on the skin side is manufactured through steps of raw material input, heating, melting, and extrusion.
  • a raw cotton as a raw material of a layer located on the back side is manufactured through a process of adding a raw material, heating, melting, extruding, and cooling and then applying an acid.
  • a plurality of lines of the nonwoven fabric manufacturing apparatus for example, when a two-layer topsheet is manufactured, there are two lines of a line for manufacturing a skin-side layer and a line for manufacturing a back-side layer.
  • Raw cotton as a raw material of the layer located on the side and raw cotton as a raw material of the layer located on the back side are separately supplied.
  • the primary defibration, weighing and blending, secondary defibration, tuft formation uniformly defibrated raw cotton is stored uniformly in the box
  • web forming by card machine
  • the sheets manufactured by web forming are stacked to form a plurality of layers, bonded by a heat fusion process, and then manufactured through a process of inspecting foreign matter contamination and winding.
  • a method of manufacturing a non-woven fabric having a plurality of layers by using an air-through manufacturing method is exemplified.
  • the same manufacturing method can be used by using another manufacturing method having a different non-woven fabric fusing method.
  • a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, a point bond method, and the like can be exemplified.
  • a hydrophilic agent may be applied together with an acid when producing raw cotton as a raw material of the layer located on the back side.
  • a hydrophilic agent may be applied at the timing after the cooling.
  • the intermediate sheet 40 may contain a water-soluble acid. Since the intermediate sheet 40 does not directly contact the wearer's skin, by adding a water-soluble acid to the intermediate sheet 40, it is possible to prevent the acid from imposing a load on the wearer's skin. In addition, since the intermediate sheet 40 is generally bulky, when the excrement reaches the absorber 56, the amount of excrement remaining inside the intermediate sheet 40 is reduced by the amount of the excrement remaining inside the top sheet 30 and the packaging sheet 58. Tend to be larger than the amount of excrement remaining in the animal. Therefore, by adding a water-soluble acid to the intermediate sheet 40 to suppress the alkalinization of the excrement remaining in the intermediate sheet 40, the burden on the skin when the excrement remaining in the intermediate sheet 40 returns is reduced. Can be reduced.
  • Water-soluble acid can be included in the packaging sheet 58. Since the packaging sheet 58 does not directly touch the wearer's skin, by adding a water-soluble acid to the packaging sheet 58, it is possible to prevent the acid from imposing a load on the wearer's skin. Further, since the packaging sheet 58 wraps the absorber 56, there are many opportunities to come into contact with the absorber 56 holding excrement. Therefore, the time during which the acid contained in the wrapping sheet 58 acts on the excrement held by the absorber 56 can be made longer, so that the inclination of the excrement held by the absorber 56 toward the alkali side can be reduced. Can be deterred.
  • the packaging sheet 58 may contain a water-soluble acid in the entire packaging sheet 58.
  • At least the absorbent 56 It is preferable to include a water-soluble acid in the skin side portion. Similarly, it is preferable to provide a hydrophilic agent in a portion on the skin side of the absorber 56.
  • a water-soluble acid in the topsheet 30 that has a high influence on the wearer's skin. That is, since the top sheet 30 is in direct contact with the skin, it is effective to suppress the alkalinization of the excrement attached to the top sheet 30. From this viewpoint, at least the top sheet 30 contains a water-soluble acid. It is important that however, besides, a water-soluble acid may be contained in any one sheet selected from the group of the intermediate sheet 40 and the packaging sheet 58, and the water-soluble acid may be contained in all the sheets of these groups. An acid may be included.
  • a water-soluble acid only in the top sheet 30, and as a sheet other than the top sheet 30, it is particularly easy to include a water-soluble acid in the intermediate sheet 40 in terms of manufacturing. Therefore, it is advantageous in terms of cost.
  • more sheets contain a water-soluble acid.
  • the plane range in which the water-soluble acid is contained is a range in which the diffusion of excrement is predicted.
  • the absorbent article is the illustrated disposable diaper
  • the amount of the excrement is large or when excretion is performed a plurality of times, it is expected that the excrement is diffused over a wide range. Therefore, it is preferable to apply an acid to the entire top sheet 30.
  • the intermediate sheet 40 and the packaging sheet 58 it is preferable to apply an acid to the same position as the top sheet 30.
  • the hydrophilic agent is provided in the same range as the acid.
  • Material 1 an air-through nonwoven fabric (diaper top sheet) having a basis weight of 20 gsm, a two-layer structure having a skin surface of 2.0 dtex and a back surface of 3.3 dtex.
  • a material of the nonwoven fabric a composite fiber of polyethylene and polyethylene terephthalate was used.
  • This air-through nonwoven fabric contains a nonionic surfactant as a hydrophilic agent. The content of the hydrophilic agent is 0.4% based on the weight of the nonwoven fabric.
  • Material 2 Air-through non-woven fabric (diaper top sheet) having a basis weight of 20 gsm and a single-layer structure of 2.2 dtex.
  • a material of the nonwoven fabric a composite fiber of polyethylene and polyethylene terephthalate was used.
  • the air-through nonwoven fabric contains a nonionic surfactant as a hydrophilic agent and citric acid as a water-soluble acid.
  • the content of the hydrophilic agent is 0.4% based on the weight of the nonwoven fabric, and the content of the water-soluble acid is 0.05% based on the weight of the nonwoven fabric.
  • the material 2 was placed on the same ten filter papers as described above. Then, a circle having a diameter of 20 mm was drawn on the material 2 by magic, and the inside of the circle was used as a measurement point. More specifically, six circles were drawn on the material 2 and the inside of each circle was defined as measurement points G to L.
  • Measurement points G to I of the material 2 were also measured under the same conditions as the first to third measurements.
  • the amount of artificial urine dropped each time was 100 ⁇ L.
  • the measurement points J to L of the material 2 were measured under the same conditions as the first to third measurements.
  • the amount of artificial urine dripped each time was 500 ⁇ L.
  • the absorbent article according to the present invention even when the wearer excretes a plurality of times, the acid is likely to remain on the top sheet 30, so that the alkalinization suppressing effect of the acid can be maintained.
  • the water-soluble acid contained in the topsheet 30 is kept from touching the skin of the wearer (for example, the topsheet 30 is not removed).
  • the burden on the skin can be reduced.
  • the excrement and the acid may return and come into contact with the wearer's skin. Can be reduced.
  • the degree of freedom in designing an absorbent article is high.
  • the site where the acid is mixed is not particularly limited, so that the production is easy.
  • a water-soluble acid is used instead of fumaric acid which is hardly dissolved in water, it can be easily applied to a sheet together with a hydrophilic agent, and can be easily manufactured.
  • malic acid which is more irritating to the skin than citric acid, is not used as in Patent Document 3.
  • the excrement inside the absorber 56 may return. Considering this point, it is also effective to prevent the excrement existing inside the absorber 56 from being alkalized. Therefore, adding a water-soluble acid to the absorber 56 itself (for example, the SAP of the absorber) is also effective in reducing the burden on the skin.
  • the acid contained in the top sheet 30 is not limited to the water-soluble acid. That is, if the affinity with the hydrophilic agent is not taken into consideration, the top sheet 30 may contain a slightly soluble acid such as fumaric acid.
  • Examples of the excrement in the present invention include urine, defecation (particularly loose stool), menstrual blood, and the like. In particular, it is effective in suppressing the alkalinization of the excretion excluding solid stool among the excrement.
  • a water-soluble acid suppresses the decomposition of urea contained in urine into ammonia by a degrading enzyme such as urease to alkalize excrement.
  • a water-soluble acid inhibits a degrading enzyme such as urease from hydrolyzing urea contained in loose stool to ammonia and alkalizing excrement.
  • the front-back direction means the direction (longitudinal direction) indicated by the symbol LD in the figure
  • the "width direction” means the direction (left-right direction) shown by WD in the figure.
  • “Deployed state” means a state in which it is flattened without shrinkage or loosening.
  • Elongation ratio means a value when the natural length is 100%. For example, an elongation ratio of 200% is synonymous with an elongation ratio of twice.
  • “Eye weight” is measured as follows. After pre-drying the sample or test piece, the sample or test piece is left in a test room or apparatus in a standard state (the test place is at a temperature of 23 ⁇ 1 ° C. and a relative humidity of 50 ⁇ 2%) to make it a constant weight state. Predrying refers to making a sample or a test piece a constant weight in an environment at a temperature of 100 ° C. Preliminary drying may not be performed for fibers having an official moisture content of 0.0%. A sample having a size of 100 mm x 100 mm is cut out from the test piece in a constant weight state using a template for sampling (100 mm x 100 mm). The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as the basis weight.
  • -"Thickness is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load: 0.098 N / cm 2 and a pressurized area: 2 cm 2 .
  • KS-G5 handy compression tester automatic thickness measuring device
  • Water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.
  • Water absorption rate is "time to end point” when JIS K7224-1996 "Test method for water absorption rate of super water absorbent resin” was performed using 2 g of super absorbent polymer and 50 g of physiological saline.
  • test location 23 ⁇ 1 ° C, relative humidity: 50 ⁇ 2%.
  • dimensions of each part mean dimensions in the unfolded state, not the natural length state.
  • the present invention can be applied to absorbent articles such as a tape-type disposable diaper, a pants-type disposable diaper, a pad-type disposable diaper, and a napkin, as well as the above-described examples.
  • absorbent articles such as a tape-type disposable diaper, a pants-type disposable diaper, a pad-type disposable diaper, and a napkin, as well as the above-described examples.
  • application to the above disposable diapers is preferable.
  • 11 liquid impermeable sheet
  • 12 exterior nonwoven fabric
  • 13 connecting tape
  • 13A connecting portion
  • 13B extending portion
  • 13C base end portion
  • 20 target sheet
  • 30 top sheet
  • 40 intermediate sheet
  • 64 side elastic member
  • F ... Abdominal part, LD ... front and rear direction
  • M Crotch part
  • SF Side flap part
  • WD Width direction
  • WP ... Wing part

Landscapes

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

Abstract

L'invention concerne un article absorbant permettant de réduire la charge dudit article absorbant sur la peau d'une personne qui le porte. Plus spécifiquement, cet article absorbant comporte une couche supérieure (30) située côté peau, et un corps absorbant situé côté arrière de la couche supérieure (30). La couche supérieure (30) est formée de plusieurs strates et parmi ces dernières, celle située côté peau ne contient pas d'acide et celle située côté arrière contient un acide.
PCT/JP2019/030677 2018-08-30 2019-08-05 Article absorbant WO2020044967A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-161633 2018-08-30
JP2018161633A JP7169818B2 (ja) 2018-08-30 2018-08-30 吸収性物品

Publications (1)

Publication Number Publication Date
WO2020044967A1 true WO2020044967A1 (fr) 2020-03-05

Family

ID=69644873

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/030677 WO2020044967A1 (fr) 2018-08-30 2019-08-05 Article absorbant

Country Status (3)

Country Link
JP (1) JP7169818B2 (fr)
TW (1) TW202009018A (fr)
WO (1) WO2020044967A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4870840U (fr) * 1971-12-07 1973-09-06
JP2003516778A (ja) * 1999-11-15 2003-05-20 パラゴン トレード ブランズ インコーポレイテッド 自然な皮膚ｐＨ値を維持することができる吸水用品
JP2004166832A (ja) * 2002-11-18 2004-06-17 Kao Corp 吸収性物品
JP2014079284A (ja) * 2012-10-12 2014-05-08 Chikazawa Paper Co Ltd 吸収性物品
JP2017217325A (ja) * 2016-06-09 2017-12-14 花王株式会社 吸収性物品
JP2018000523A (ja) * 2016-06-30 2018-01-11 ユニ・チャーム株式会社 吸収性物品
JP2018015078A (ja) * 2016-07-26 2018-02-01 王子ホールディングス株式会社 吸収性物品

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4870840U (fr) * 1971-12-07 1973-09-06
JP2003516778A (ja) * 1999-11-15 2003-05-20 パラゴン トレード ブランズ インコーポレイテッド 自然な皮膚ｐＨ値を維持することができる吸水用品
JP2004166832A (ja) * 2002-11-18 2004-06-17 Kao Corp 吸収性物品
JP2014079284A (ja) * 2012-10-12 2014-05-08 Chikazawa Paper Co Ltd 吸収性物品
JP2017217325A (ja) * 2016-06-09 2017-12-14 花王株式会社 吸収性物品
JP2018000523A (ja) * 2016-06-30 2018-01-11 ユニ・チャーム株式会社 吸収性物品
JP2018015078A (ja) * 2016-07-26 2018-02-01 王子ホールディングス株式会社 吸収性物品

Also Published As

Publication number Publication date
TW202009018A (zh) 2020-03-01
JP2020031922A (ja) 2020-03-05
JP7169818B2 (ja) 2022-11-11

Similar Documents

Publication Publication Date Title
KR101443872B1 (ko) 흡수성 물품 및 흡수 요소의 제조방법
JP2011234896A (ja) 使い捨て吸収性物品
JP6219436B2 (ja) 吸収性物品
WO2020044968A1 (fr) Article absorbant
JP6202614B2 (ja) 使い捨ておむつ
JP7049185B2 (ja) テープタイプ使い捨ておむつ
JP7082507B2 (ja) 使い捨て吸収性物品
JP2007090056A (ja) 吸収性物品
JP6278774B2 (ja) フマル酸含有不織布およびこれを用いた吸収性物品
JP2021078872A (ja) 使い捨ておむつ
JP7289689B2 (ja) テープタイプ使い捨ておむつ
WO2022130977A1 (fr) Couche jetable
WO2020044967A1 (fr) Article absorbant
JP7323997B2 (ja) 吸収性物品
JP7236833B2 (ja) 吸収性物品
JP2009254662A (ja) 吸収性物品
WO2010041997A1 (fr) Article absorbant à transfert amélioré d'une composition
JP7370151B2 (ja) 使い捨ておむつ
JP2020049178A (ja) 吸収性物品
JP7360293B2 (ja) 吸収性物品
JP2014068856A (ja) 使い捨ておむつ
JP7148335B2 (ja) パッドタイプ吸収性物品
JP7290917B2 (ja) テープタイプ使い捨ておむつ
JP2009291283A (ja) 吸収性物品
JP2024113168A (ja) 吸収性物品

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19855507

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19855507

Country of ref document: EP

Kind code of ref document: A1