WO2021060134A1 - 吸収性物品 - Google Patents

吸収性物品 Download PDF

Info

Publication number
WO2021060134A1
WO2021060134A1 PCT/JP2020/035221 JP2020035221W WO2021060134A1 WO 2021060134 A1 WO2021060134 A1 WO 2021060134A1 JP 2020035221 W JP2020035221 W JP 2020035221W WO 2021060134 A1 WO2021060134 A1 WO 2021060134A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
cell
polymer particles
woven fabric
absorbent polymer
Prior art date
Application number
PCT/JP2020/035221
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
祐里香 ▲高▼木
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
Priority to CN202080056407.XA priority Critical patent/CN114206290A/zh
Publication of WO2021060134A1 publication Critical patent/WO2021060134A1/ja

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
    • 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
    • A61F13/531—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 a homogeneous composition through the thickness of the pad
    • A61F13/532—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 a homogeneous composition through the thickness of the pad inhomogeneous in the plane 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
    • A61F13/535—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes

Definitions

  • the present invention relates to an absorbent article having improved absorption performance.
  • the absorbent article includes an absorber, a liquid-permeable top sheet that covers the front side of the absorber, and a liquid-impermeable sheet that covers the back side of the absorber, and excrement fluid such as urine and menstrual blood is a top sheet. Is absorbed and retained by the absorber.
  • the absorber one in which highly absorbent polymer particles (SAP) are mixed with hydrophilic short fibers such as crushed pulp and stacked in a cotton-like shape is widely used, but while ensuring a sufficient absorbable amount.
  • SAP highly absorbent polymer particles
  • hydrophilic short fibers such as crushed pulp and stacked in a cotton-like shape
  • the cell absorption sheet depends on the highly absorbent polymer particles for its absorption performance, it is suitable for a large amount of non-viscous liquid such as urine as an absorption amount, but its absorption rate is slow. Therefore, when the object to be absorbed is a viscous liquid such as a liquid in muddy stool, watery stool, or loose stool, the viscous liquid remains on the surface of the diaper for a certain length of time, flows on the surface of the absorbent article, and moves around. There was a problem that it was easy to leak from.
  • the main subject of the present invention is to improve the absorbability of the viscous liquid.
  • the absorbent articles that have solved the above problems are as follows. ⁇ First aspect> The absorber and the liquid permeable top sheet arranged on the front side of the absorber are provided.
  • the absorber includes a liquid-permeable upper sheet and a lower sheet, and a cell in which the upper sheet and the lower sheet are non-joined portions surrounded by a joint portion between the upper sheet and the lower sheet. , Containing a cell absorbing sheet having a powder or granular material containing highly absorbent polymer particles housed in this cell.
  • the upper sheet is a highly water-absorbent non-woven fabric having a Krem water absorption of 100 mm or more.
  • An absorbent article characterized in that.
  • the absorbability of the viscous liquid can be remarkably improved. Further, the viscous liquid absorbed and diffused by the upper sheet can be transferred to the highly absorbent polymer particles in the cell absorbing sheet, and can be absorbed and held by the highly absorbent polymer particles.
  • the highly water-absorbent nonwoven fabric forming the upper sheet is a wet nonwoven fabric having a basis weight of 25 to 50 g / m 2 containing 50% or more of pulp fibers or rayon fibers.
  • the absorbent article of the first aspect is a wet nonwoven fabric having a basis weight of 25 to 50 g / m 2 containing 50% or more of pulp fibers or rayon fibers.
  • Such a wet non-woven fabric because the non-viscous liquid can be rapidly absorbed and diffused due to the capillary phenomenon caused by the minute fiber gaps. Further, such a wet non-woven fabric not only has a high degree of Krem water absorption, but is also very thin and flexible, so that it is possible to suppress a decrease in flexibility and an increase in thickness of the cell absorbing sheet as a whole.
  • the wet non-woven fabric has a support layer containing long fibers of synthetic resin and a pulp layer located on the outermost side and composed of only pulp fibers.
  • the absorbent article of the second aspect is a support layer containing long fibers of synthetic resin and a pulp layer located on the outermost side and composed of only pulp fibers.
  • Such a wet non-woven fabric is preferable because the pulp layer can increase the water retention on the upper side of the upper sheet and the presence of the support layer can increase the strength.
  • the cell absorbing sheet contains highly absorbent polymer particles adjacent to the back surface of the upper sheet.
  • the cell absorbing sheet has highly absorbent polymer particles adjacent to the back surface of the upper sheet because the viscous liquid absorbed and diffused by the upper sheet can be efficiently delivered to the highly absorbent polymer particles.
  • ⁇ Fifth aspect> A portion of the upper sheet located in each cell is extruded upward, and a pair of concave portions and convex portions are formed on the upper surface and the lower surface of the upper sheet.
  • the cell absorbing sheet in order to secure the volume when the highly absorbent polymer particles inside are absorbed and expanded, at least one of the upper sheet and the lower sheet is a recess in which the portion located in each cell is extruded outward in the thickness direction. It is preferable to have.
  • the upper sheet has a recess because the surface area of the upper sheet becomes large and the liquid can be supplied in a wider range to the highly absorbent polymer particles in the cell absorbing sheet.
  • a liquid impermeable sheet arranged on the back side of the absorber is provided.
  • the lower sheet is a highly water-absorbent non-woven fabric having a Krem water absorption of 50 mm or more, a water retention under load of 0.1 g or more, and a water retention under no load of 0.5 g or more.
  • the non-viscous liquid that has permeated the cell absorbing sheet moves on the liquid impermeable sheet and exudes from the periphery of the cell absorbing sheet to the skin side to the skin. There is a risk of sticking or leaking.
  • the non-viscous liquid that reaches the lower sheet without being absorbed by the highly absorbent polymer particles is absorbed by the lower sheet and lower. After water is retained and diffused in the sheet, it can be sucked up by the highly absorbent polymer particles in the cell absorbing sheet.
  • FIG. 6-6 is a sectional view taken along the line 6-6 of FIG. It is a 7-7 sectional view of FIG. (A) is a sectional view taken along the line 8-8 of FIG. 1, and (b) is a sectional view taken along the line 9-9 of FIG. It is a cross-sectional view of 5-5 of FIG. (A) The bottom view of the main part of the absorber, and (b) the 1-1 cross-sectional view thereof. It is a top view of the absorber. It is a top view of the absorber. It is a top view of the absorber.
  • FIG. 8 It is a 2-2 sectional view of FIG. 8 and FIG. It is a top view of the absorber which showed the joint part simply.
  • FIG. 1 to 6 show an example of a tape-type disposable diaper, in which reference numeral X indicates the entire width of the diaper excluding the fastening tape, and reference numeral L indicates the total length of the diaper.
  • each component member adjacent in the thickness direction is fixed or joined in the same manner as a known diaper, except for the fixing or joining portion described below.
  • the dotted pattern portion in the cross-sectional view shows an adhesive such as a hot melt adhesive as the fixing or joining means.
  • Known hot melt adhesives include slot coating, continuous linear or dotted bead coating, spiral, Z, wavy and other spray coating, and pattern coating (transfer of hot melt adhesive by letterpress method).
  • 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 type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation.
  • a means by material welding such as a heat seal or an ultrasonic seal can also be used.
  • the constituent members adjacent to each other in the thickness direction are fixed or joined in an intermittent pattern.
  • intermittent pattern coating such as spiral shape, Z shape, and wavy shape can be preferably used, and the coating width is within a range equal to or larger than the coating width by one nozzle.
  • intermittent pattern such as a spiral shape, a Z shape, or a wavy shape with or without a gap in the width direction.
  • This tape-type disposable diaper has a basic structure in which an absorber 70 is interposed between a liquid-permeable top sheet and a liquid-impermeable sheet located on the back side.
  • this tape-type disposable diaper has an end flap EF that extends to the front side and the rear side of the absorber 70, respectively, and does not have the absorber 70, and has a side edge of the absorber 70. It has a pair of side flap SFs that extend laterally. Both side edges of the side flap SF have a shape constricted along the circumference of the legs, but may be linear.
  • Fastening tapes 13 are provided on the side flap SFs on the dorsal side portion B, respectively, and when wearing a diaper, the side flap SFs on the dorsal side portion B are overlapped on the outside of the side flap SFs on the ventral side portion F. , Fastening tape 13 is locked in place on the outer surface of the ventral portion F.
  • the entire outer surface other than the fastening tape 13 is formed of the exterior non-woven fabric 12.
  • the liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior nonwoven fabric 12 with an adhesive such as a hot melt adhesive, and is further absorbed by the liquid-impermeable sheet 11 on the inner surface side.
  • the body 70, the intermediate sheet 40, and the top sheet 30 are laminated in this order.
  • the top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction LD and the width direction WD than the absorber 70, and have side edges of the absorber 70 in the top sheet 30.
  • the peripheral portion that protrudes from the side edge of the absorbent body 70 in the liquid impermeable sheet 11 is joined by a hot melt adhesive or the like.
  • the liquid impermeable sheet 11 is formed to be slightly wider than the top sheet 30.
  • both sides of the tape-type disposable diaper are provided with rising gathers 60 that stand up on the skin side of the wearer, and the gather sheets 62 forming the rising gathers 60 are formed on both sides of the top sheet 30 from above each side. It is fixed to the inner surface of the flap SF.
  • non-woven fabric a known non-woven fabric can be appropriately used depending on the site and purpose.
  • the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers.
  • the constituent fibers of the non-woven fabric include hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by the water-repellent agent) even if they are hydrophilic fibers (including fibers made hydrophilic by the hydrophilic agent). ) May be.
  • the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure.
  • non-woven fabrics It is classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics having a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.), and any of these non-woven fabrics can be used.
  • SMS non-woven fabrics having a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.
  • the exterior non-woven fabric 12 constitutes the outer surface of the product, and is intended to give the outer surface of the product a cloth-like appearance and feel.
  • the fiber basis weight of the exterior non-woven fabric is preferably 10 to 50 g / m 2 , and particularly preferably 15 to 30 g / m 2 .
  • the exterior non-woven fabric 12 can be omitted, in which case the liquid-impermeable sheet 11 can have the same shape as the exterior non-woven fabric 12 to form the outer surface of the product.
  • the material of the liquid-impermeable sheet 11 is not particularly limited, but is substantially, for example, an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a waterproof film.
  • a non-woven fabric that ensures liquid impermeableness in this case, the waterproof film and the non-woven fabric form a liquid-impermeable sheet.
  • a material having liquid impermeableness and moisture permeability which has been favorably used from the viewpoint of preventing stuffiness in recent years, can also be exemplified.
  • the sheet of the material having liquid impermeability and moisture permeability for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then stretched in the uniaxial or biaxial direction.
  • the microporous sheet obtained in the above can be exemplified. Furthermore, it is waterproofed by a non-woven fabric using microdenyl fibers, strengthening of leakage resistance by reducing the voids of the fibers by applying heat or pressure, and coating with a highly water-absorbent resin or hydrophobic resin or water repellent.
  • a liquid-impermeable sheet without using a film can also be used as the liquid-impermeable sheet 11.
  • the top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. Both sides of the top sheet 30 may be folded back to the back side of the absorber 70, or may protrude laterally from the side edge of the absorber 70 without being folded back, as shown in the illustrated example.
  • the top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal, or by a hot melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable.
  • the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 45 located on the front side of the absorber 70 by a hot melt adhesive applied to the back surface thereof.
  • the intermediate sheet 40 is joined to the back surface of the top sheet 30 in order to quickly move the excrement liquid that has passed through the top sheet 30 toward the absorber 70 and to prevent reversion.
  • heat embossing or ultrasonic welding can also be used to join the intermediate sheet 40 and the top sheet 30.
  • the intermediate sheet 40 in addition to using a non-woven fabric, a resin film having a large number of through holes can also be used.
  • the non-woven fabric the same material as the top sheet 30 can be used, but those having higher hydrophilicity than the top sheet 30 and those having a higher fiber density have the characteristics of liquid transfer from the top sheet 30 to the intermediate sheet 40. It is preferable because it is excellent.
  • an air-through non-woven fabric can be preferably used. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven fabric.
  • the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
  • Basis weight is preferably 17 ⁇ 80g / m 2, more preferably 25 ⁇ 60g / m 2.
  • the thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex.
  • eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.
  • the intermediate sheet 40 in the illustrated example is arranged in the center shorter than the width of the absorber 70, it may be provided over the entire width.
  • the dimension of the front-rear LD of the intermediate sheet 40 may be the same as the total length of the diaper, the dimension of the absorber 70 may be the same, or the dimension may be within a short length range centered on the region for receiving the liquid.
  • the rising gather 60 is composed of a gather sheet 62 and an elongated gather elastic member 63 fixed to the gather sheet 62 in an extended state along the LD in the front-rear direction.
  • a water-repellent non-woven fabric can be used as the gather sheet 62, and a rubber thread or the like can be used as the elastic member 63.
  • a plurality of elastic members may be provided on each side, and one elastic member may be provided on each side.
  • the inner surface of the gather sheet 62 has a fixing start end of the width direction WD on the side portion of the top sheet 30, and the outer portion of the width direction WD from the fixing start end is the side portion of the liquid impermeable sheet 11 and the portion thereof. It is fixed to the side portion of the exterior nonwoven fabric 12 located in the above with a hot melt adhesive or the like.
  • the inside of the WD in the width direction from the fixed start end of the rising gather 60 is fixed on the top sheet 30 at both ends of the LD in the front-rear direction of the product, but the part between them is a non-fixed free part.
  • This free portion stands up due to the contraction force of the elastic member 63.
  • the diaper is worn, the diaper is mounted on the body in a boat shape, and the contraction force of the elastic member 63 acts on the diaper. Therefore, the contraction force of the elastic member 63 causes the gathers 60 to stand up and come into close contact with the legs. As a result, so-called lateral leakage from around the legs is prevented.
  • both ends of the front-rear LD in the inner portion of the width direction WD of the gather sheet 62 are the proximal end side portion extending inward from the outer portion of the width direction WD and the proximal end side portion. Folded from the central edge of the width direction WD to the body side and fixed in a folded state having a tip side part extending to the outside of the width direction WD, and the part in between is an unfixed free part. You can also.
  • each side flap SF In each side flap SF, as shown in FIGS. 1 to 3, between the gather sheet 62 and the liquid permeable sheet 11 on the outside of the widthwise WD near the fixing start end of the fixing portion of the gather sheet 62. , The leg circumference elastic member 64 made of an elongated elastic member such as rubber thread is fixed in a state of being extended along the front-rear direction LD, whereby the leg circumference portion of each side flap SF is configured as a flat gather. ing.
  • the leg-surrounding elastic member 64 can also be arranged between the liquid-impermeable sheet 11 and the exterior non-woven fabric 12 in the side flap SF.
  • a plurality of elastic members 64 around the legs may be provided on each side as shown in the illustrated example, or only one elastic member 64 may be provided on each side.
  • the fastening tape 13 is a sheet base material forming a tape mounting portion 13C fixed to the side portion of the diaper and a tape main body portion 13B protruding from the tape mounting portion 13C. And a locking portion 13A with respect to the ventral side provided in the middle portion of the tape main body portion 13B in the sheet base material in the width direction WD, and the portion on the tip end side from the locking portion 13A is used as a knob portion. It is a diaper.
  • the tape attachment portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the outer non-woven fabric 12 forming the outer layer in the side flap SF, and is adhered to the sheets with a hot melt adhesive. Further, the locking portion 13A is fixed to the sheet base material with an adhesive.
  • a hook material male material of a mechanical fastener (hook-and-loop fastener) is suitable.
  • the hook material has a large number of engaging protrusions on its outer surface side.
  • As the shape of the engaging protrusion there are a checkered shape, a J-shaped shape, a mushroom shape, a T-shaped shape, a double J-shaped shape (a shape in which J-shaped ones are joined back to back), and the like. It may be in the shape of.
  • an adhesive layer can be provided as a locking portion of the fastening tape 13.
  • the sheet base material forming the tape mounting portion 13C to the tape main body portion 13B includes various non-woven fabrics such as spunbonded non-woven fabric, air-through non-woven fabric, and spunlaced non-woven fabric, as well as plastic film, polylami non-woven fabric, paper, and composite materials thereof. Can be used.
  • the target sheet 12T may be one in which a large number of loop threads are provided on the surface of a sheet base material made of a plastic film or a non-woven fabric so that the engaging protrusions of the hook material are entangled.
  • the target sheet 12T may be a target sheet 12T obtained by subjecting the surface of a sheet base material made of a plastic film having a smooth surface to be highly adhesive to a peeling treatment.
  • the locking portion of the fastening tape 13 on the ventral side portion F is made of a non-woven fabric
  • the exterior non-woven fabric 12 of the illustrated example is made of a non-woven fabric and the locking portion 13A of the fastening tape 13 is a hook material.
  • the target sheet 12T may be provided between the exterior non-woven fabric 12 and the liquid impermeable sheet 11.
  • the absorber 70 is a portion that absorbs and retains the liquid content of excrement.
  • the absorber 70 can be adhered to at least one of the front and back members via an adhesive 50h such as a hot melt adhesive.
  • the absorber 70 is surrounded by a joint portion 54 of the upper sheet 51 and the lower sheet 52 having liquid permeability, and a large number of cells 55 to which the upper sheet 51 and the lower sheet 52 are not joined are not joined.
  • the cell absorbing sheet 50 has (small chamber) and a powder or granular material containing the highly absorbent polymer particles 53 contained in the cell 55.
  • the cell absorption sheet 50 will be explained in more detail. As shown enlarged in FIG. 7, the cell absorbing sheet 50 is surrounded by an upper sheet 51, a lower sheet 52 arranged on the back side thereof, and a joint portion 54 between the upper sheet 51 and the lower sheet 52. Moreover, it has a cell (small chamber) 55 in which the upper sheet 51 and the lower sheet 52 are non-bonded portions, and highly absorbent polymer particles 53 contained in the cell 55. A large number of cells 55 are arranged at intervals of the joint portion 54. By distributing and holding the highly absorbent polymer particles 53 in a large number of cells 55 surrounded by the joint portion 54 in this way, it is possible to prevent uneven distribution of the highly absorbent polymer particles 53 in the cell absorbing sheet 50.
  • At least one of the upper sheet 51 and the lower sheet 52 in the cell 55 is outside the cell 55 in the expanded state in order to facilitate the arrangement of the highly absorbent polymer particles 53 during production and to secure the volume after absorption expansion. It is preferable that the recess 50c is recessed in the center, but the recess 50c may not be provided, and the highly absorbent polymer particles 53 may be simply sandwiched between the upper sheet 51 and the lower sheet 52.
  • the recess 50c can be formed by subjecting the target sheet to a shaping process such as embossing. Further, by this embossing, a convex portion 50p that bulges outward is formed in the portion of the target sheet located at each cell 55. That is, when the concave portion 50c is formed in the upper sheet 51 by embossing, the portion of the upper sheet 51 located at each cell 55 is extruded upward to form a convex portion 50p that bulges upward.
  • the depth 50d of the recess 50c is not particularly limited, but is preferably 1.0 to 7.0 mm, particularly about 1.0 to 5.0 mm.
  • the dimensions of the convex portion 50p can be appropriately determined, but from such a viewpoint, the dimension 55L of the convex portion 50p in the front-rear direction LD of the upper sheet 51 is 6 to 30 mm, and the width direction of the convex portion 50p of the upper sheet 51.
  • the WD dimension 55W is 7 to 50 mm
  • the width 54W of the joint 54 is 1.0 to 1.8 mm
  • the valley depth 50d (convex 50p height) of the upper sheet 51 is 1.0. It is preferably about 7.0 mm.
  • a middle sheet 80 made of a non-woven fabric is interposed between the upper sheet 51 and the lower sheet 52, but FIG. 14 (b). ), It is not necessary to provide the middle sheet 80.
  • the middle sheet 80 is provided, the upper sheet 51, the middle sheet 80, and the lower sheet 52 are joined at the joint portion 54. Further, the middle sheet 80 is compressed in the thickness direction at the portion located at the joint portion 54, and swells into the recess 50c at the portion located inside the cell 55 (in other words, the fiber density decreases as the distance from the joint portion increases. ) Is preferable.
  • the concave portion 50c (and therefore the convex portion) is not easily crushed by the pressure applied in the packaging state of the product or the pressure applied at the time of mounting, and even if the concave portion 50c is crushed, at least the portion where the middle sheet 80 has entered due to the elasticity of the middle sheet 80. Shape restoration is promoted to a volume close to or close to that. Then, at the time of absorption of the excrement liquid, the highly absorbent polymer expands the fiber gaps of the middle sheet 80 and can be expanded by inserting the middle sheet 80, easily compressing the middle sheet 80, or both of them. The presence of the middle sheet 80 is unlikely to inhibit the expansion of the highly absorbent polymer particles 53.
  • the fibers of the middle sheet 80 spreading in the recess 50c secure a liquid passage to the individual highly absorbent polymer particles 53, the decrease in diffusivity is suppressed even after the highly absorbent polymer particles 53 start expanding. And gel blocking is less likely to occur. Therefore, due to these synergistic actions, the absorption rate (particularly at the initial stage of absorption) of the disposable diaper provided with the cell absorption sheet 50 is improved.
  • the upper sheet 51 is preferably a highly water-absorbent non-woven fabric having a Krem water absorption of 100 mm or more.
  • the highly water-absorbent non-woven fabric forming the upper sheet 51 is particularly preferably having a Krem water absorption of 130 mm or more. Further, the upper limit of the Krem water absorption of the highly water-absorbent non-woven fabric forming the upper sheet 51 is not particularly limited, but is preferably about 180 mm, particularly preferably 160 mm.
  • the amount of water retained under load of the highly water-absorbent non-woven fabric 42 of the upper sheet 51 is preferably greater than 0 g and 0.15 g or less, and particularly preferably greater than 0 g and 0.12 g or less.
  • the amount of water retained under no load by the highly water-absorbent nonwoven fabric 42 of the upper sheet 51 is preferably greater than 0 g and 0.7 g or less, and particularly preferably greater than 0 g and 0.3 g or less.
  • the highly water-absorbent non-woven fabric forming the upper sheet 51 is not limited by the material and the manufacturing method, but is a wet non-woven fabric having a texture of 25 to 50 g / m 2 containing 50% or more of pulp fiber or rayon fiber (particularly wet spunlace non-woven fabric). Is preferable.
  • a fiber other than the pulp fiber or rayon fiber an olefin-based fiber such as polyethylene or polypropylene, a polyester-based fiber, a polyamide-based synthetic fiber (including a composite fiber such as a core sheath as well as a single component fiber) can be used.
  • such a wet non-woven fabric because the viscous liquid can be rapidly absorbed and diffused due to the capillary phenomenon caused by the minute fiber gaps.
  • such a wet non-woven fabric not only has a high degree of Krem water absorption, but is also very thin and flexible, so that it is possible to suppress a decrease in flexibility and an increase in thickness of the cell absorbing sheet 50 as a whole.
  • the thickness of the highly water-absorbent nonwoven fabric forming the upper sheet 51 is not limited, but in the case of the above-mentioned basis weight, it is preferably about 0.13 to 0.48 mm.
  • the highly water-absorbent nonwoven fabric forming the upper sheet 51 has a support layer 42b containing long fibers of synthetic resin and a pulp layer 42a located on the outermost side and composed of only pulp fibers.
  • a layer, or a highly water-absorbent non-woven fabric 42 having three or more layers is particularly suitable.
  • Such a highly water-absorbent non-woven fabric 42 is preferable because the pulp layer 42a can increase the Krem water absorption and the presence of the support layer 42b can increase the strength.
  • the upper sheet 51 has the recess 50c because the surface area of the upper sheet 51 becomes large and the liquid can be supplied to the highly absorbent polymer particles in the cell absorbing sheet 50 in a wider range.
  • the material of the lower sheet 52 is not particularly limited, but it is a highly water-absorbent non-woven fabric having a Krem water absorption of 50 mm or more, a water retention under load of 0.1 g or more, and a water retention under no load of 0.5 g or more. preferable.
  • the non-viscous liquid U such as urine supplied to the cell absorbing sheet 50 is absorbed by the highly absorbent polymer particles 53 in the cell absorbing sheet 50 and has high absorbency.
  • the non-viscous liquid U that has reached the lower sheet 52 without being absorbed by the polymer particles 53 is absorbed by the lower sheet 52, retained in the lower sheet 52, diffused, and then the highly absorbent polymer particles in the cell absorbing sheet 50. It can be sucked up by 53.
  • the cell absorbing sheet 50 has a joint portion 54 having no highly absorbent polymer particles 53 extending continuously toward the periphery of the cell absorbing sheet 50 and having a convex portion 50p on the back surface of the cell absorbing sheet 50.
  • the gap between the back surface and the facing surface of the cell absorbing sheet 50 also extends continuously toward the periphery of the cell absorbing sheet 50.
  • the non-viscous liquid U that has permeated the cell absorbing sheet 50 moves on the liquid impermeable sheet 11 and exudes from the periphery of the absorbent body 70 to the skin side. It may adhere to the skin or leak.
  • the Krem water absorption of the highly water-absorbent non-woven fabric forming the lower sheet 52 is 70 mm or more.
  • the upper limit of the Krem water absorption of the highly water-absorbent non-woven fabric forming the lower sheet 52 is not particularly limited, but is preferably about 150 mm, particularly preferably 100 mm.
  • the amount of water retained under load of the highly water-absorbent non-woven fabric forming the lower sheet 52 is particularly preferably 0.13 g or more.
  • the upper limit of the amount of water retained under load of the highly water-absorbent nonwoven fabric forming the lower sheet 52 is not particularly limited, but is preferably about 0.30 g, particularly preferably 0.26 g.
  • the amount of water retained under no load of the highly water-absorbent non-woven fabric forming the lower sheet 52 is particularly preferably 0.70 g or more.
  • the upper limit of the amount of water retained under load of the highly water-absorbent nonwoven fabric forming the lower sheet 52 is not particularly limited, but is preferably about 1.40 g, particularly preferably 1.20 g.
  • the highly water-absorbent non-woven fabric forming the lower sheet 52 the same highly water-absorbent non-woven fabric as the upper sheet 51 can be preferably used.
  • the highly water-absorbent non-woven fabric forming the lower sheet 52 is preferably a heat-welded fiber such as a polyethylene fiber or a composite fiber containing a polyethylene component. Since the purpose of the highly water-absorbent non-woven fabric used for the lower sheet 52 is to temporarily store the non-viscous liquid U such as urine, it is preferable that the non-woven fabric has a larger amount of water retention than the upper sheet 51.
  • the highly water-absorbent non-woven fabric forming the lower sheet 52 preferably has a water retention capacity under load of 2 to 4 times that of the high water-absorbent non-woven fabric of the upper sheet 51. More specifically, the texture of the highly water-absorbent non-woven fabric forming the lower sheet 52 should be 1.2 to 1.8 times the texture of the highly water-absorbent non-woven fabric forming the lower sheet 52, or as the highly water-absorbent non-woven fabric forming the lower sheet 52.
  • a plurality of highly water-absorbent non-woven fabrics equivalent to the upper sheet 51 can be stacked and arranged.
  • the lower sheet 52 has a recess 50c because the surface area of the lower sheet 52 becomes large and the amount of water retained in the lower sheet 52 increases as compared with the case where the lower sheet 52 is flattened without being subjected to shaping processing.
  • the medium sheet 80 is not particularly limited as long as it is a non-woven fabric, but the fineness of the constituent fibers of the non-woven fabric is preferably about 1.6 to 7.0 dtex, and more preferably 5.6 to 6.6 dtex.
  • the porosity of the non-woven fabric of the middle sheet 80 is preferably 80 to 98%, more preferably 90 to 95%.
  • the high-absorbent polymer particles 53 ensure the elasticity of the middle sheet 80 as much as possible, and the middle sheet 80 is used before and during the absorption of the excrement liquid. It becomes possible to easily enter the fiber gap of.
  • the thickness of the middle sheet 80 may be appropriately determined in consideration of the depth 50d of the recess 50c, the degree of penetration into the recess 50c, etc., but the thickness is 10% to 90% of the depth 50d of the recess 50c. It is preferably 70% to 90%, and more preferably 70% to 90%.
  • the basis weight of the middle sheet 80 may be appropriately determined for the same reason, but it is preferably about 25 to 40 g / m 2 in the above thickness range.
  • the constituent fibers are crimped fibers.
  • the constituent fibers of the non-woven fabric of the middle sheet 80 are hydrophilic fibers (including fibers made hydrophilic by the hydrophilic agent), the water retention property is high, and when the non-woven fabric is a hydrophobic fiber, the diffusibility is improved.
  • the fiber bonding method of the non-woven fabric is not particularly limited, but an air-through non-woven fabric in which the fibers are bonded by hot air heating is used as the middle sheet in order to sufficiently bond the fibers to ensure elasticity while increasing the porosity (widening the fiber gap). 80 is preferable.
  • the separation distance 80s can be appropriately determined, but is preferably 30% or less of the depth 50d of the recess 50c. As described above, when a gap is generated in the cell 55, the convex portion 50p (recessed portion 50c) may be crushed according to the gap in the product state.
  • the middle sheet 80 is provided with respect to at least one of the upper sheet 51 and the lower sheet 52 in both the cell 55 and the joint portion 54. It may be adhered by the hot melt adhesive 80h, or may not be adhered to both the upper sheet 51 and the lower sheet 52 as shown in FIG. 14 (c).
  • the highly absorbent polymer particles 53 are not fixed to the upper sheet 51, the lower sheet 52, and the middle sheet 80 so that they can move freely. However, some or almost all (eg, 95% or more) of the highly absorbent polymer particles 53 can also be adhered or adhered to at least one of the upper sheet 51, the lower sheet 52 and the middle sheet 80.
  • FIG. 14B shows an example in which a part of the highly absorbent polymer particles 53 is adhered to the lower sheet 52 with an adhesive 53h such as a hot melt adhesive. Further, the highly absorbent polymer particles 53 may be agglomerated to some extent.
  • the highly absorbent polymer particles 53 are freely movable in the cell 55, if the cell 55 has a hollow portion, the highly absorbent polymer particles 53 move in the cell 55 during use, so that the sound is produced. Absorption may be hindered due to peeling or uneven distribution of the highly absorbent polymer particles 53 in the cell 55. Therefore, in order to solve this, as described above, the surface of the middle sheet 80 facing the recess 50c is brought into contact with the inner surface of the recess 50c, that is, the high porosity is high over almost the entire cell 55 including the recess 50c. Filling the fibers of the middle sheet 80 is one preferred form.
  • the highly absorbent polymer particles 53 are captured by the fibers of the middle sheet 80, pressed against the upper sheet 51 and / or the lower sheet 52, or both, so that free movement is less likely to occur. Therefore, while preventing the expansion inhibition of the high absorption polymer particles 53, the generation of sound due to the movement of the high absorption polymer particles 53 and the absorption inhibition due to the uneven distribution of the high absorption polymer particles 53 in the cell 55 are prevented. can do.
  • the highly absorbent polymer particles 53 are most abundant on the upper surface of the middle sheet 80, and are downward from there.
  • the interposition of the middle sheet 80 makes it difficult for the jerky touch (uncomfortable feeling) of the highly absorbent polymer particles 53 to be transmitted to the hand.
  • the middle sheet 80 is a bulky non-woven fabric having a high porosity
  • the highly absorbent polymer particles 53 can enter the fiber gaps of the middle sheet 80 before and during the absorption of the excrement liquid. The absorption rate is further improved.
  • the excrement liquid enters a large amount in the middle sheet 80, which has few high-absorbent polymer particles 53, and is absorbed by the high-absorbent polymer particles 53 in the middle sheet 80, or is a high-absorbent polymer. It is either temporarily stored until absorbed by the particles 53 or diffused into the surrounding cells 55.
  • the excrement liquid diffused to the surroundings is absorbed by the highly absorbent polymer particles 53 in the middle sheet 80 existing there, or is sucked up by the highly absorbent polymer particles 53 present in large quantities above it. Then, in the process in which each of the highly absorbent polymer particles 53 absorbs the excrement liquid, the highly absorbent polymer expands the fiber gaps and expands while entering between them or compressing the middle sheet 80.
  • the excrement is rapidly diffused over a wide area of the cell absorption sheet 50 and is in a state of being received inside the cell absorption sheet 50, so that not only the absorption rate is improved but also the reversion prevention property is achieved. It will be excellent. Further, in order to exert such an absorption mechanism satisfactorily, it is preferable that the recess 50c is formed at least in a portion of the upper sheet 51 that constitutes each cell 55.
  • the degree of distribution of the highly absorbent polymer particles 53 in the cell 55 can be appropriately determined, but usually, the weight ratio of the highly absorbent polymer particles 53 present on the upper surface of the middle sheet 80 is 50% or more of the total amount.
  • the weight ratio of the highly absorbent polymer retained in the middle sheet 80 (that is, not on the lower sheet 52) is preferably 45% or more of the total amount.
  • the distribution of the highly absorbent polymer particles 53 in the cell 55 is not limited to this. Therefore, if the suction property from the highly absorbent non-woven fabric forming the lower sheet 52 is emphasized, the highly absorbent polymer particles 53 are most present on the upper surface of the lower sheet 52 as shown in FIG. 13 (c). , It is also preferable to have a distribution that decreases upward from there. Further, as shown in FIG. 14A, the amount of the highly absorbent polymer particles 53 present on the upper surface of the middle sheet 80 and the upper surface of the lower sheet 52 is larger than that in the portion between them. You may.
  • the distribution may be such that the highly absorbent polymer particles 53 are most abundant in the middle of the middle sheet 80 in the thickness direction and decrease from there toward the upper side and the lower side.
  • This form can be formed by forming the middle sheet 80 into a two-layer non-woven fabric and sandwiching the highly absorbent polymer particles 53 between the layers.
  • the basis weight of the highly absorbent polymer particles 53 may be appropriately determined, but in the usual case, it can be, for example, 150 to 250 g / m 2 .
  • the texture of the highly absorbent polymer particles 53 is less than 150 g / m 2, it is difficult to secure the absorption amount, and if it exceeds 250 g / m 2 , the highly absorbent polymer particles 53 when the user touches the outer surface of the product by hand. It makes it easier to feel the squishy feel (uncomfortable feeling) in your hands.
  • the planar shape of the cell 55 can be appropriately determined, and as shown in FIG. 8 and the like, it can be a hexagon, a rhombus, a square, a rectangle, a circle, an ellipse, etc. It is desirable to have a rectangular shape, and it is desirable to arrange them without gaps as shown in the illustrated example.
  • a plurality of types of cells 55 having different shapes and dimensions, which are not shown, may be arranged in combination.
  • the planar arrangement of the cells 55 (that is, the gathering portion of the highly absorbent polymer particles 53 is also the same) can be appropriately determined, but a regularly repeated planar arrangement is preferable, and an oblique lattice shape as shown in FIG. 12 (a) is preferable.
  • Hexagonal lattice as shown in FIG. 12 (b) (these are also called staggered), square lattice as shown in FIG. 12 (c), rectangular lattice as shown in FIG. 12 (d), and the like.
  • Parallel lattice as shown in 12 (e) (as shown in the figure, two groups of parallel diagonal rows are provided so as to intersect each other), etc. (These are 90 with respect to the expansion and contraction direction).
  • the group of cells 55 (the arrangement of the group units may be regular or irregular, and may be patterns, letters, etc.) is the rule. It can also be repeated.
  • each cell 55 can be appropriately determined, for example, the dimension 55L of the front-rear direction LD (equal to the size of the front-rear direction LD of the convex portion 50p) can be about 6 to 30 mm, and the size of the width direction WD 55W. (Equivalent to the dimension of the WD in the width direction of the convex portion 50p) can be about 7 to 50 mm.
  • the area of each cell 55 can be about 31 to 1650 mm 2.
  • the joint portion 54 for joining the upper sheet 51 and the lower sheet 52 is preferably joined by welding the upper sheet 51 and the lower sheet 52 as in ultrasonic welding or heat sealing, but via a hot melt adhesive. It may be joined.
  • the joint portion 54 of the upper sheet 51 and the lower sheet 52 is arranged so as to surround each cell 55, and is intermittent as shown in the illustrated example as long as it is a boundary between adjacent cells. ), It can also be formed in a continuous linear shape.
  • the joint 54 is formed intermittently, it is preferable that the highly absorbent polymer particles 53 are absent or, if any, less than in the cell 55 between the joints 54 in the direction surrounding the cell 55.
  • the fibers of the middle sheet will pass between the adjacent joints and extend between a large number of cells. Therefore, since the liquid diffusion passage is formed between the adjacent joints, the absorption rate can be improved by improving the liquid diffusibility between the cells.
  • the joint portion 54 is a weak joint portion 54b that can be peeled off by the expansion force of the highly absorbent polymer particles 53 in the adjacent cell 55, the height in the adjacent cell 55 is also high. It may be a strong joint portion 54a that basically does not peel off due to the expansion force of the absorbent polymer particles 53. In order to cope with the expansion of the highly absorbent polymer particles 53 having an individual cell 55 volume or more, it is preferable that a part or all of the joint portion 54 is a weak joint portion 54b.
  • the cells 55 adjacent to each other across the weakly joined portion 54b are separated and united by the absorption expansion pressure of the highly absorbent polymer particles 53 in the cell 55, and are united into one large cell 55. It becomes possible to become.
  • the strong bonding portion 54a is a portion that basically does not peel off even if the cells 55 on both sides thereof absorb and expand, the diffusibility is improved by continuing in a specific direction, or the highly absorbent polymer particles 53 It has the effects of preventing the flow of the gelled product and reducing the contact area on the surface side. Therefore, by combining this with the weakly joined portion, the cell absorbing sheet 50 having various features can be constructed as described later.
  • the joint portion 54 located on the outermost side in the width direction WD is designated as a strong joint portion 54a because if it is peeled off, the highly absorbent polymer particles 53 or a gelled product thereof may leak to the side of the cell absorbing sheet 50. Is desirable. From the same viewpoint, the upper sheet 51 and the lower sheet 52 are extended to some extent outside the WD in the width direction from the cell 55 forming region, and the edge joint portion 54c is provided for reinforcement in this extending portion. preferable.
  • the difference in joint strength may be easily formed by changing the area of the joint portion 54, but is not limited to this.
  • the joint portion 54 is formed by a hot melt adhesive
  • the hot melt adhesive is used.
  • the weak joint portion 54b can be formed only by making the joint portion 54 a dotted line and widening the point spacing 54D. Since the portion 54 is a portion that serves as a boundary between adjacent cells 55, if the point spacing 54D becomes too wide, there will be many gaps at the boundary between adjacent cells 55, and the highly absorbent polymer particles 53 will easily move.
  • the weak joint portion 54b portion is easily peeled off even though the gap is small. Become.
  • the dimensions of the joint portion 54 that joins the upper sheet 51 and the lower sheet 52 can be appropriately determined.
  • the width (the dimension in the direction orthogonal to the direction surrounding the cell 55 and equal to the distance between the cells 55) 54W is 1. It can be about 0 to 1.8 mm.
  • the dimension 54L of the joint portion 54 in the direction surrounding the cell 55 is about 0.6 to 1.5 mm, and the point spacing 54D is 0. It is preferably about 8. to 3.0 mm.
  • the width 54W is about 1.3 to 1.8 mm
  • the size 54L of the joint portion 54 is about 1.0 to 1.5 mm
  • the point spacing 54D is 0.8 to 2.0 mm. It is preferable to set the degree.
  • the width 54W is about 1.0 to 1.3 mm
  • the size 54L of the joint portion 54 is about 0.6 to 1.0 mm
  • the point spacing 54D is about 1.5 to 3.0 mm. It is preferable to set the degree.
  • the volume of the highly absorbent polymer particles 53 in the cell 55 at the time of saturated absorption is sufficiently larger than the volume of the cell 55 adjacent to the weakly joined portion 54b.
  • the type and amount of the highly absorbent polymer particles 53 arranged in each cell 55 can be determined.
  • the volume of the cell 55 that can be combined by peeling off the weak joint portion 54b after the combination is higher than the volume of the cell 55 that can be combined.
  • the type and amount of the highly absorbent polymer particles 53 arranged in each cell 55 can be determined so that the volume of the polymer particles 53 at the time of saturated absorption becomes small.
  • the width of the joint portion 54 when the joint portion 54 is formed in a continuous linear shape and the width 54 W when the joint portion 54 is formed in a dotted line shape are constant in the direction surrounding the cell 55 and can be changed. .. Further, the shape of each joint 54 when the joint 54 is formed in a dotted line shape can be appropriately determined, and all of them may be the same, or different shapes may be used depending on the part. In particular, when the shape of each cell 55 is polygonal, it is preferable to provide a joint portion 54 at at least one of the intermediate position of each side and each vertex position.
  • the strong joint portion 54a it is preferable to provide it at each vertex position, but in the case of the weak joint portion 54b, it is easier for the weak joint portion 54b to peel off if it is not provided at each vertex position, and the cells 55 are united. Is preferable because it proceeds smoothly.
  • the diffusibility improving portion 57 made of 55 s is provided.
  • the low-expansion cell 55s of the diffusibility improving portion 57 has a smaller amount of the highly absorbent polymer particles 53 per unit area than the cells 55 adjacent to both sides of the diffusible improving portion 57, and the diffusibility improving portion
  • the joint portion 54 between the cells 55 adjacent to both sides of the 57 is a weak joint portion 54b. In this case, as shown in FIG.
  • a wide groove having the diffusible improving portion 57 as the bottom is formed due to the difference in the amount of expansion between the diffusible improving portion 57 and the peripheral portion thereof.
  • the groove promotes liquid diffusion.
  • the weakly joined portion between the low expansion cells 55s of the diffusibility improving portion 57 and the cells 55 on both sides thereof It continues until the 54b comes off, and even after the weak joint portion 54b comes off, the strong joint portion 54a does not come off. Therefore, although the width of the groove is narrowed, the groove having the strong joint portion 54a as the bottom remains and the diffusibility is maintained.
  • the width of the groove is wide at the initial stage of absorption when diffusion of a large amount of excrement is important, and after that, the low expansion cell 55s of the diffusibility improving portion 57 is also the surrounding cell 55 so as not to cause problems such as gel blocking.
  • a groove remains due to the strong joint portion 54a, and the diffusivity improving action is maintained.
  • the amount of the highly absorbent polymer particles 53 contained in the low-expansion cell 55s is preferably 1/3 or less of the adjacent cells 55 in terms of weight ratio, and it is particularly preferable not to include them at all.
  • the strong joint portion 54a is represented by a thick dotted line
  • the other weak joint portion 54b is represented by a thin dotted line
  • the cell 55 that is, the low expansion cell 55s and the low expansion cell 55s
  • the cells 55) excluding the empty cells 56, which will be described later, have a diagonal line pattern in FIG.
  • the diffusibility improving portion 57 may be provided over the entire length of the cell absorbing sheet 50, and as shown in FIG. 11, the intermediate portion of the front-rear direction LD (particularly including the crotch portion, and before and after the crotch portion). It may be provided only in the range covering both sides). Further, as shown in FIGS. 8 and 11, the diffusibility improving unit 57 may be provided at one place in the center of the WD in the width direction, or may be provided at a plurality of places at intervals in the WD in the width direction, although not shown. it can.
  • the gelled product of the highly absorbent polymer particles 53 expanded during absorption can be largely moved in the front-rear LD in the united cell 55.
  • the gelled product may collect in a low place such as a crotch portion and deteriorate the wearing feeling. Therefore, as shown in FIG. 8, the lateral strong joint line 59 (see FIG. 7), in which the strong joint portion 54a is a portion continuously or intermittently (continuous linear or dotted line) in the width direction WD or the diagonal direction, is formed.
  • a plurality of LDs in the front-rear direction are provided at intervals.
  • the strong bonding portion 54a which basically does not peel off during absorption, can prevent the gelled product of the highly absorbent polymer particles 53 from moving in the anteroposterior direction LD, and can prevent the shape of the cell absorbing sheet 50 from collapsing. ..
  • the strong bonding portion 54a which basically does not peel off during absorption, can prevent the gelled product of the highly absorbent polymer particles 53 from moving in the anteroposterior direction LD, and can prevent the shape of the cell absorbing sheet 50 from collapsing. ..
  • the vertical strong joining line 58 which is a portion where the strong joining portion 54a continues to the front-rear direction LD over the entire length of the cell absorbing sheet 50, is on the outermost side of the cell 55 in the width direction WD. It is provided on both sides of the width direction WD along the edge, and is also provided in the middle of these width direction WDs, and the lateral strong joint line 59 extends between the vertical strong joint lines 58 adjacent to the width direction WD.
  • the cell 55 does not coalesce in the maximum expansion section 55G or more surrounded by the strong joint portion 54a, the gelled product of the highly absorbent polymer particles 53 expanded during absorption is formed. It does not move outside the maximum expansion section 55G, and the shape of the cell absorbing sheet 50 can be effectively prevented from being deformed during absorption.
  • the vertical strong joint line 58 which is a portion where the strong joint portion 54a continues in the front-rear direction LD, improves the liquid diffusivity in the vertical direction
  • the strong joint portion 54a is a portion which continues in the width direction WD or the diagonal direction.
  • the wire 59 improves the liquid diffusivity in the lateral direction.
  • the size, shape, and arrangement of the maximum expansion section 55G (that is, the arrangement of the strong joint portion 54a) can be appropriately determined, but if the maximum expansion section 55G is made too small, there is no point in providing the strong joint portion 54a, and the number of cells 55 At most, when the cells are elongated, the shape of the cells 55 after being combined becomes a shape that does not easily swell.
  • vertical strong joint lines 58 are provided at the center and both sides of the cell absorption sheet 50 in the width direction, respectively, and the horizontal strong joint lines 59 are the central vertical strong joints. Between the wire 58 and the vertical strong joint wire 58 on both sides, each of them has a zigzag shape extending in the front-rear direction while repeatedly bending left and right. As a result, the substantially triangular maximum expansion section 55G having an apex at the position of the central vertical strong joint line 58 and the substantially triangular maximum expansion section 55G having vertices at the positions of the vertical strong joint lines 58 on both sides are formed. , It is repeatedly formed alternately in the front-back direction.
  • the laterally strong joint lines 59 are formed in a zigzag shape in this way, the liquid diffusion in the lateral direction can be efficiently promoted with a small number of laterally strong joint lines 59, and the maximum expansion section 55G becomes a substantially triangular shape that easily swells. , The amount of increase in cell volume with respect to the number of cells 55 combined is also excellent, which is preferable.
  • an empty cell 56 having a smaller inclusion amount per unit area of the highly absorbent polymer particles 53 than other cells can be provided.
  • the cells 55 containing the highly absorbent polymer particles 53 that is, the cells 55 excluding the low expansion cells 55s and the empty cells 56 described later
  • the shaded area in FIG. 8 assumes the spraying area 53A of the highly absorbent polymer particles 53 at the time of manufacture, so that the peripheral cell 55 has a portion without the diagonal pattern, but the cell
  • the highly absorbent polymer particles 53 are movable within the 55, the position of the highly absorbent polymer particles 53 in the cell 55 is not fixed in the product, and the cell 55 is similar to that in the other figures.
  • Highly absorbent polymer particles 53 can be distributed throughout the inside.
  • the amount of the highly absorbent polymer particles 53 contained in the empty cell 56 is preferably 1/2 or less of that of the other cells in terms of weight ratio, and it is particularly preferable not to include the particles at all.
  • the front end and the rear end of the cell absorbing sheet 50 are formed by cutting into individual cell absorbing sheets 50 during manufacturing, if the highly absorbent polymer particles 53 are contained in this position, the blade of the cutting device The life may be shortened. Therefore, it is desirable that at least the cell 55 at the position where the front and rear ends of the cell absorbing sheet 50 pass is an empty cell 56.
  • the portion concerned has less expansion even after absorption, and therefore the cell absorption sheet 50 has legs even after absorption.
  • the highly absorbent polymer particles 53 are included in the cell 55, but powder particles other than the highly absorbent polymer particles such as deodorant particles can be included together with the highly absorbent polymer particles 53. ..
  • the particle size of the highly absorbent polymer particles 53 is not particularly limited, but for example, the proportion of particles larger than 500 ⁇ m is 30% by weight or less, the proportion of particles of 500 ⁇ m or less and more than 180 ⁇ m is 60% by weight or more, and more than 106 ⁇ m and 180 ⁇ m. It is preferable that the proportion of the following particles is 10% by weight or less and the proportion of particles of 106 ⁇ m or less is 10% by weight or less.
  • the particle size is measured as follows.
  • the highly absorbent polymer particles 53 can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Further, it is preferable that the highly absorbent polymer particles 53 are produced by a crushing method because gel blocking is unlikely to occur.
  • Examples of the highly absorbent polymer particles 53 include starch-based, cellulose-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethyl cellulose. Cross-linked products, acrylic acid (salt) polymers, and the like can be used.
  • As the shape of the highly absorbent polymer particle 53 a commonly used powder or granular material is preferable, but other shapes can also be used.
  • the highly absorbent polymer particles 53 those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 70 returns to the outside of the absorber 70, is likely to occur.
  • the highly absorbent polymer particles 53 those having a gel strength of 1000 Pa or more are preferably used. As a result, the sticky feeling after liquid absorption can be effectively suppressed.
  • the absorber 70 can be wrapped by the packaging sheet 45.
  • one wrapping sheet 45 can be wrapped in a tubular shape so as to surround the front and back surfaces and both side surfaces of the absorber 70, and can be wrapped by being sandwiched between the two wrapping sheets 45 from both the front and back surfaces.
  • tissue paper particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles 53 to come out.
  • a non-woven fabric is used for the packaging sheet 45
  • a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly preferable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material thereof.
  • the basis weight of the non-woven fabric used for the packaging sheet 45 is preferably 5 to 40 g / m 2 , especially 10 to 30 g / m 2 .
  • the packaging sheet 45 is wound from the back surface of the absorber 70 to both sides of the upper surface of the absorber 70 via both sides of the WD in the width direction of the absorber 70, and the width of the upper surface of the absorber 70. It is preferable to provide a region 45S not covered by the packaging sheet 45 in the middle portion of the direction WD.
  • the absorber 70 is generally coated with a packaging sheet 45 in order to prevent leakage of highly absorbent polymer particles during production, before use, or after absorption. However, the absorber 70 absorbs a viscous liquid. Considering the property, it is desirable that the upper sheet 51 comes into contact with the viscous liquid N promptly. Therefore, as shown in FIG.
  • the upper sheet 51 is based on a highly water-absorbent non-woven fabric having a high Krem water absorption (that is, dense), it is a highly absorbent polymer similar to that in which the entire absorber 70 is covered with the packaging sheet 45. It exerts the effect of preventing the leakage of particles.
  • the "MD direction” and the “CD direction” mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to the flow direction, and one of them is the front-rear direction of the product. The other is in the width direction of the product.
  • the MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric.
  • the fiber orientation is the direction along which the fibers of the non-woven fabric follow. For example, the measurement method based on the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481 or the fiber orientation based on the tensile strength ratio in the anteroposterior direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.
  • the "front-back direction” means the direction indicated by the symbol LD in the figure (vertical direction), and the “width direction” means the direction indicated by the WD in the figure (horizontal direction), and the front-back direction and the width direction. Are orthogonal.
  • Front surface means the surface of the member that is closer to the wearer's skin when worn
  • back surface means the surface of the member that is farther from the wearer's skin when worn.
  • Unfolded state means a state in which the unfolded state is flat without shrinkage or slack.
  • Elongation rate means the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
  • Articleificial urine includes urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97. It is a mixture of 09 wt% and is used at a temperature of 37 ° C. unless otherwise specified.
  • Gel strength is measured as follows. To 49.0 g of artificial urine, 1.0 g of a highly absorbent polymer is added and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. ⁇ 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering).
  • Method is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ⁇ 1 ° C., relative humidity 50 ⁇ 2%) to bring it to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm ⁇ 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm ⁇ 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the basis weight.
  • the "thickness” is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load of 0.098 N / cm 2 and a pressurized area of 2 cm 2.
  • KS-G5 handy compression tester automatic thickness measuring device
  • Water absorption rate is defined as “time to end point” when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin” was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. To do.
  • Krem water absorption means the Krem water absorption measured by "paper and paperboard-water absorption test method-Krem method” specified in JIS P 8141: 2004.
  • Water retention means what is measured by the following method. Prepare a test piece of 10 cm in the MD direction x 10 cm in the CD direction (area 100 cm 2 ), and measure the weight before absorption. Next, after immersing the test piece in artificial urine for 5 seconds, lightly pinch one of the corners with the thumb and index finger (pick as lightly as possible without squeezing water), and the opposite corners are below. Hang it so that it faces the surface, leave it for 30 seconds, and drop the drops. After that, when measuring the "water retention amount under load", the test piece is placed on a stack of eight filter papers (length 150 mm x width 150 mm), and the length 100 mm x so that the load is applied to the entire upper surface of the test piece.
  • a square columnar weight (weight 3 kg) having a bottom surface of 100 mm in width is placed, the weight is removed after 5 minutes, and the weight of the test piece after absorption is measured.
  • the weight of the test piece after absorption is measured.
  • place the test piece on a stack of eight filter papers do not put anything on it, and measure the weight of the test piece after absorption after 5 minutes. To do.
  • the values obtained by converting the difference between the weight after absorption and the weight before absorption per 10 cm 2 area are defined as “water retention under load” and "water retention under no load”.
  • the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.
  • test or measurement shall be performed in a test room or device under standard conditions (test location: temperature 23 ⁇ 1 ° C, relative humidity 50 ⁇ 2%). ..
  • the present invention can be used for all absorbent articles such as pants-type disposable diapers, pad-type disposable diapers, and sanitary napkins, in addition to tape-type disposable diapers as in the above example.
  • LD front-back direction, N ... viscous liquid, U ... non-viscous liquid, WD ... width direction, 11 ... liquid-impermeable sheet, 12 ... exterior non-woven fabric, 12T ... target sheet, 13 ... fastening tape, 13A ... locking part, 13B ... Tape body, 13C ... Tape mounting part, 30 ... Top sheet, 40 ... Intermediate sheet, 42 ... High water absorption non-woven fabric, 42a ... Pulp layer, 42b ... Support layer, 45 ... Packaging sheet, 50 ... Cell absorption sheet, 50c ... Concave, 50d ... Depth, 50p ... Convex, 51 ... Upper sheet, 52 ... Lower sheet, 53 ...
  • Highly absorbent polymer particles 54 ... Joint, 54a ... Strong joint, 54b ... Weak joint, 54c ... Edge joint, 55 ... cell, 55G ... maximum expansion section, 55s ... low expansion cell, 56 ... empty cell, 57 ... diffusivity improvement part, 58 ... vertical strong joint line, 59 ... horizontal strong joint line, 60 ... rising Gather, 62 ... Gather sheet, 70 ... Absorber, 80 ... Medium sheet.

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)
PCT/JP2020/035221 2019-09-27 2020-09-17 吸収性物品 WO2021060134A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080056407.XA CN114206290A (zh) 2019-09-27 2020-09-17 吸收性物品

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019176974A JP7291053B2 (ja) 2019-09-27 2019-09-27 吸収性物品
JP2019-176974 2019-09-27

Publications (1)

Publication Number Publication Date
WO2021060134A1 true WO2021060134A1 (ja) 2021-04-01

Family

ID=75165722

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/035221 WO2021060134A1 (ja) 2019-09-27 2020-09-17 吸収性物品

Country Status (4)

Country Link
JP (1) JP7291053B2 (sv)
CN (1) CN114206290A (sv)
TW (1) TW202112331A (sv)
WO (1) WO2021060134A1 (sv)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09562A (ja) * 1995-06-16 1997-01-07 New Oji Paper Co Ltd 吸収性物品
JP2004201939A (ja) * 2002-12-25 2004-07-22 Daio Paper Corp 吸収性物品
JP2009061230A (ja) * 2007-09-10 2009-03-26 Kao Corp 吸収性物品
JP2017176507A (ja) * 2016-03-30 2017-10-05 大王製紙株式会社 吸収性物品

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY116007A (en) * 1994-12-28 2003-10-31 Kao Corp Absorbent sheet, process for producing the same and absorbent article
US6663949B1 (en) * 1998-07-24 2003-12-16 Kao Corporation Deodorizing absorbent sheet
JP6411066B2 (ja) * 2014-05-12 2018-10-24 ユニ・チャーム株式会社 吸収体用の不織布シートを含む吸収性物品、及び当該吸収性物品に用いられる不織布シートの製造方法
CN204618593U (zh) * 2015-01-08 2015-09-09 倍护(中国)有限公司 一种一次性吸湿物品
JP6366565B2 (ja) * 2015-12-09 2018-08-01 大王製紙株式会社 吸収性物品
CN205494179U (zh) * 2016-03-25 2016-08-24 黄山富田精工制造有限公司 一种吸收体
JP6656100B2 (ja) * 2016-07-04 2020-03-04 ユニ・チャーム株式会社 吸収性物品用の吸収体及び当該吸収体を含む吸収性物品
JP6382384B1 (ja) * 2017-03-29 2018-08-29 大王製紙株式会社 吸収性物品
CN109953853B (zh) * 2017-12-26 2021-10-22 大王制纸株式会社 吸收性物品

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09562A (ja) * 1995-06-16 1997-01-07 New Oji Paper Co Ltd 吸収性物品
JP2004201939A (ja) * 2002-12-25 2004-07-22 Daio Paper Corp 吸収性物品
JP2009061230A (ja) * 2007-09-10 2009-03-26 Kao Corp 吸収性物品
JP2017176507A (ja) * 2016-03-30 2017-10-05 大王製紙株式会社 吸収性物品

Also Published As

Publication number Publication date
JP7291053B2 (ja) 2023-06-14
TW202112331A (zh) 2021-04-01
CN114206290A (zh) 2022-03-18
JP2021052901A (ja) 2021-04-08

Similar Documents

Publication Publication Date Title
JP7094304B2 (ja) 吸収性物品
WO2021060133A1 (ja) 吸収性物品
WO2021060134A1 (ja) 吸収性物品
WO2021060131A1 (ja) 吸収性物品
WO2021059959A1 (ja) 吸収性物品
WO2021060132A1 (ja) 吸収性物品
WO2021060130A1 (ja) 吸収性物品
WO2021193002A1 (ja) 吸収性物品
JP2021052901A5 (sv)
JP7499661B2 (ja) 吸収性物品
JP2021052898A5 (sv)
JP2021052897A5 (sv)
JP2021153716A5 (sv)
JP6209240B2 (ja) 吸収性物品
JP2022049273A5 (sv)

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: 20867076

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: 20867076

Country of ref document: EP

Kind code of ref document: A1