WO2007049725A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2007049725A1
WO2007049725A1 PCT/JP2006/321431 JP2006321431W WO2007049725A1 WO 2007049725 A1 WO2007049725 A1 WO 2007049725A1 JP 2006321431 W JP2006321431 W JP 2006321431W WO 2007049725 A1 WO2007049725 A1 WO 2007049725A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
absorbent
superabsorbent polymer
polymer particles
liquid
Prior art date
Application number
PCT/JP2006/321431
Other languages
English (en)
Japanese (ja)
Inventor
Yumiko Seike
Akinori Fukae
Tomotsugu Matsui
Original Assignee
Daio Paper Corporation
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
Priority claimed from JP2005310659A external-priority patent/JP4841224B2/ja
Priority claimed from JP2005376645A external-priority patent/JP4969101B2/ja
Priority claimed from JP2006101161A external-priority patent/JP4724587B2/ja
Application filed by Daio Paper Corporation filed Critical Daio Paper Corporation
Publication of WO2007049725A1 publication Critical patent/WO2007049725A1/fr

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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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/4704—Sanitary towels, incontinence pads or napkins having preferential bending zones, e.g. fold lines or grooves
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • A61F13/4751—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction
    • A61F13/4756—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction the means consisting of grooves, e.g. channels, depressions or embossments, resulting in a heterogeneous surface level
    • 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
    • A61F13/45—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 shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49001—Absorbent articles specially adapted to be worn around the waist, e.g. diapers having preferential bending zones, e.g. fold lines or grooves
    • 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
    • A61F13/533—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 having discontinuous areas of compression

Definitions

  • the present invention relates to an absorbent article in which a groove-like emboss reaching from the top sheet to the absorbent main body is formed, particularly an absorbent formed by a filament aggregate formed by opening a tow.
  • Articles preferably paper diapers.
  • the present invention also relates to an absorbent article and a method for producing an absorbent body.
  • Absorbent articles such as infant and adult tape-type and pants-type disposable diapers and sanitary napkins include a top sheet on the use surface side, a back sheet that prevents permeation of liquid on the back side, and these
  • the basic element is an absorbent body that is interposed between sheets and receives and holds excreted liquid that has permeated through the top sheet.
  • a form that improves the touch when a plastic sheet is used as a knock sheet for example, by providing an exterior sheet such as non-woven fabric on the back side of the knock sheet, and so-called knocks on both sides of the product.
  • forms that provide elastic stretch to improve fit around the waist and abdomen, such as forms that form rear cuffs, are appropriately added.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-65300
  • Patent Document 2 Special Table 2000- 524399 (W099 / 27879) Publication
  • Patent Document 3 Japanese Patent Publication No. 2004-500165 (US Pat. No. 6,646,180)
  • Tow has a relatively high density as it is, and its absorption performance and softness are insufficient.
  • the filament aggregate formed by opening the tow while squeezing is weakly linked to each other. Therefore, the shape collapses due to external force applied during use, and the initial absorption performance is reduced. There was a possibility that it could not be demonstrated.
  • the filament aggregate when the filament aggregate is oriented in the longitudinal direction of the absorbent element (product), it tends to flow excessively (run) in the orientation direction of the absorbed hydraulic filament, and crosses the orientation direction of the filament. In this direction, it is difficult to diffuse, and there is a limit to increasing the overall absorption capacity.
  • the crotch part is uniformly in the width direction.
  • many absorbent articles are provided with a noir cuff standing on the use surface side on both sides of the top sheet. If both sides of the crotch part are inflated, the substantial standing height of the Noriya cuff is reduced, and the follow-up performance to the body surface is also reduced by merely reducing the amount of damming.
  • the first problem of the present invention is to improve the shape stability of the filament aggregate and improve the fit of the wearer to the skin.
  • the second problem is to quickly absorb the liquid into the absorbent body while flowing the liquid along the groove of the emboss.
  • the third problem is to prevent leakage due to excessive supply of liquid to the edge of the absorbing element.
  • the fourth problem is to solve the problem that the crotch portion expands uniformly in the width direction and deteriorates the wearing feeling.
  • the present invention that has solved the above problems is as follows.
  • an absorbent main body including an absorbent body formed by a filament aggregate formed by opening a tow, and a liquid-impermeable sheet in this order, [0017]
  • groove-shaped embosses that reach the absorber from the top sheet are formed substantially along the longitudinal direction on both sides of the wearer's crotch. Absorbent article.
  • groove-shaped embosses that reach the absorber from the top sheet are formed along the longitudinal direction at least on both sides of the wearer's crotch.
  • the area between the embosses starts to fit in the crotch area of the wearer at the embossed part, and the excreted liquid spreads on the top sheet, causing front and back or side leakage , And quickly penetrates into the absorbent body.
  • the emboss is formed in a form that reaches the absorber, the liquid that has penetrated into the absorber diffuses along the emboss, and as a result, the absorption rate of the entire absorber is improved.
  • the diffusion rate of the liquid is faster in the orientation direction of the filament aggregate than in the direction intersecting this.
  • the emboss in the intersecting direction functions like a weir and diffuses in the direction intersecting the filament aggregate. And increase the diffusion rate of the absorber as a whole.
  • the embossing along the direction intersecting the orientation direction of the filament aggregate prevents the filament aggregate from being weakly linked to each other, and in particular, according to the embossing utilizing heat fusion.
  • the effect of preventing looseness due to high adhesion of the filament assembly is high, and the required absorption capacity is less likely to be deformed by external force applied during use.
  • the emboss includes at least a first portion formed substantially longitudinally on both sides of the wearer's crotch, and a second portion formed on the front and back portions of the absorbent main body, and the first portion
  • the absorbent article according to claim 1 or 2 wherein the second portion and the second portion are substantially connected to each other, and a substantially annular emboss is formed.
  • the superabsorbent polymer particles in the filament aggregate.
  • the filament assembly may move and become unevenly distributed within the filament assembly, or the filament assembly force may be lost. If such a situation occurs, the absorption performance is hindered, and the unevenness of the superabsorbent polymer particles that have lost the filament aggregate strength gives the user a sly discomfort, which is not preferable.
  • the movement of the superabsorbent polymer particles in the filament aggregate can be suppressed, the uneven distribution of the superabsorbent polymer particles is prevented, and the urine diffusibility and the absorption speed are improved. And gel blocking can be prevented.
  • the absorbent element has a difficult-to-absorb filament assembly obtained by opening the tow and having an absorption amount of 1.0 times or less of its own weight
  • the filament extends along the top sheet, and both ends of the filament are spaced inward from the peripheral edge of the absorbent element.
  • both ends of the filament are spaced inward from the peripheral edge of the absorbent element, even if the liquid travels along the filament and diffuses to both ends, the diffusion can be stopped before the peripheral edge of the absorbent element. Therefore, the excessive supply of the liquid to the end portion of the absorbing element is suppressed, and leakage prevention is achieved.
  • the absorption amount of the present invention is measured by the following procedure.
  • the absorbent body is attached to a liquid permeable sheet or a liquid permeable sheet.
  • embossed recesses that extend along the front-rear direction and the middle part in the front-rear direction bulges to the center in the width direction.
  • the use surface at the center in the width direction can be raised from both sides, and the fit between the crotch and the crack can be improved.
  • the absorbent element has a lower layer absorber and an upper layer absorber provided on the top sheet side,
  • the upper-layer absorbent body is obtained by opening the tow and has an absorption capacity of a hard-to-absorb filament that is absorbed by 1.0 times or less of its own weight.
  • the filament aggregate has a filament along the top sheet. And both ends of the filament are spaced inward from the periphery of the lower layer absorber,
  • the lower layer absorber plays a role of holding (storing) the absorbed liquid, it is preferable to employ an absorber having an excellent water absorption amount as described in this section.
  • the absorbent element has a lower layer absorber and an upper layer absorber provided on the top sheet side,
  • the lower layer absorbent body is obtained by opening the tow and has an absorption capacity of a hard-to-absorb filament that is absorbed by 1.0 times or less of its own weight.
  • the filament aggregate has a filament along the top sheet. And both ends of the filament are spaced inward from the periphery of the upper absorbent body,
  • the use surface at the center in the width direction can be raised from both sides, and the fit between the crotch and the crack can be improved.
  • a method for producing an absorbent body comprising: cutting the filament assembly at predetermined intervals, and attaching the cut filament assembly to a predetermined position on the absorbent body or the absorbent sheet.
  • the filament aggregate obtained by opening the tow is a material that is difficult to handle in manufacturing because it is easy to disintegrate or lose its shape. For this reason, in the manufacture of conventional absorbers, the filament aggregates are handled in a continuous state, and the filament aggregates are also cut using cutting into individual absorbers.
  • the continuous filament aggregate is attached to the continuous liquid-permeable sheet or wrapped with the liquid-permeable sheet, so that the filament aggregate is scattered or loses its shape. It becomes difficult to do.
  • a sheet processing device such as a slip force utter can be used, and the assembly of filaments is desired in the absorbent body without requiring special equipment. It becomes possible to arrange in the position.
  • the absorbent element includes an absorbent body having an aggregate of filaments opened from tow and superabsorbent polymer particles,
  • the absorbent body has a crotch portion, a front portion of the crotch portion, and a rear portion of the crotch portion.
  • the main absorbent portion which is a portion other than both sides of the crotch portion, has superabsorbent polymer particles, and the basis weight of the superabsorbent polymer particles on both sides of the crotch portion is less than that of the main absorbent portion.
  • the main absorbent portion which is a portion other than the both side portions of the crotch portion, has high-absorbent polymer particles.
  • the basis weight of the superabsorbent polymer particles is less than that of the main absorption portion, and when the excretory fluid is absorbed, the expansion at both sides of the crotch portion is suppressed. As a result, both sides of the crotch can be flexibly fitted around the legs when excreted fluid is absorbed.
  • the present invention is characterized in that the basis weight of the superabsorbent polymer particles is different between both side portions of the crotch portion and other portions. Therefore, if the superabsorbent polymer particles move freely, the effects of the present invention described above may be diminished. Therefore, it is preferable to adhere the superabsorbent polymer particles to the filament assembly as described in this section.
  • the absorbent body is treated with tissue paper (crepe paper) for the purpose of preventing the filament aggregate from warping or deformation, or enhancing the integrity of the filament aggregate and the superabsorbent polymer particles.
  • tissue paper crepe paper
  • the absorbent article according to any one of claims 14 to 16, comprising a holding sheet for holding the superabsorbent polymer particles.
  • a holding sheet as described in this section can be adopted in addition to the above-mentioned adhesion.
  • the movement of the superabsorbent polymer particles can be more effectively suppressed by adhering the superabsorbent polymer to the holding sheet.
  • holding hole means a force that includes at least one of a hollow hole and a through hole, and does not include anything depending on the shape of the sheet itself, such as an interfiber gap in a nonwoven fabric (the same applies hereinafter). .
  • the holding sheet with holding holes only in the part that overlaps the main absorbent part, it is possible to efficiently move the superabsorbent polymer particles from the main absorbent part to both sides of the crotch part. It can be well controlled.
  • adhesion for adhering superabsorbent polymer particles that can efficiently suppress the migration of the superabsorbent polymer particles from the main absorbent portion to both sides of the crotch portion. Since there is no agent on both sides of the crotch part, the increase in rigidity on both sides of the crotch part can be suppressed, and while the movement of the superabsorbent polymer particles is suppressed by adhesion, the fit at the time of wearing is not bad.
  • adhesion for adhering superabsorbent polymer particles that can efficiently suppress the migration of the superabsorbent polymer particles from the main absorbent portion to both sides of the crotch portion. Since there is no agent on both sides of the crotch part, the increase in rigidity on both sides of the crotch part can be suppressed, and while the movement of the superabsorbent polymer particles is suppressed by adhesion, the fit at the time of wearing is not bad.
  • the liquid along the embossed grooves can improve the shape stability of the absorbent body, particularly the filament aggregate, and can improve the fit of the wearer to the skin. As a result, it is possible to absorb the liquid quickly into the absorbent body while flowing.
  • FIG. 1 shows an example of a pants-type disposable diaper as an absorbent article.
  • the pan-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent body 20, and the absorbent body 20 is fixed to the exterior sheet 12.
  • the absorbent main body 20 is a portion that receives and absorbs and holds liquids such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later).
  • the exterior sheet 12 is a part for attaching to the wearer.
  • the exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which the wearer's leg is inserted.
  • the absorbent body 20 can take any shape, but is rectangular in the illustrated form.
  • the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed at a predetermined position, and both sides of the front body 12F and the back body 12B of the exterior sheet 12
  • the joining region 12A is joined by heat fusion or the like.
  • An intermediate width in the longitudinal direction of the absorbent main body 20 shown in the drawing (that is, the vertical direction in Fig. 2 and also in the longitudinal direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. ing. This width relationship may be reversed or the same width.
  • the exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and a form that fits the wearer by the contraction force is desirable.
  • the elastic elastic member thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers.
  • the rubber threads 12C, 12C,... are continuously provided in the width direction in the waist region W, provided only on both sides in the waist region U, and provided in the crotch region L. Absent.
  • the rubber thread 1 2C, 12C ... is provided in both the waist region W and the lower waist region U, so that even if the elastic force of the thread rubber 12C itself is weak, the wearer also in the lower waist region U as a whole In As a result, the product fits well to the wearer.
  • the absorbent main body 20 has a top sheet 30 having a strength such as a non-woven fabric that allows the liquid to pass therethrough as shown in FIG. 3 showing the state without embossing and FIG. 4 showing the state with the embossing formed. And an intermediate sheet (second sheet) 40 and an absorbent element 50 constituting the main element of liquid absorption.
  • the absorbent element 50 includes an absorbent body 56 that absorbs and holds the received liquid, and a liquid-impermeable sheet (also referred to as a back sheet) 70 such as a plastic sheet is provided on the back side thereof.
  • the exterior sheet 12 is provided on the back side of the liquid-impermeable sheet 70.
  • barrier cuffs 60, 60 on both sides are also used to cover the back side.
  • the top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, polyolefin fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these Etc. can be illustrated. Sarakuko and non-woven fabric may be manufactured by any processing.
  • Karoe method examples include known methods such as the spunlace method, the spunbond method, the thermal bond method, the melt blown method, the needle punch method, the air through method, and the point bond method.
  • the spun lace method is a preferable cache method when the flexibility and drapeability are required
  • the thermal bond method is preferable when the bulkiness and softness are required.
  • the top sheet 30 may be a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.
  • Examples of the intermediate sheet 40 include the same material as the top sheet 30, spun lace, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper.
  • an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
  • the intermediate sheet (second sheet) 40 is interposed between the top sheet 30 and the covering sheet 58.
  • the intermediate sheet 40 in the form shown in the figure is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width.
  • the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56, or may be within a short or long range centered on the region for receiving the liquid.
  • a typical material for the intermediate sheet 40 is a nonwoven fabric excellent in liquid permeability.
  • the absorbent element 50 includes an absorbent body 56 that absorbs and retains the received liquid, and the absorbent body 56 may be a cotton-like pulp fiber, but in a preferred embodiment, the tow is opened.
  • An enveloping sheet that includes an aggregate of filaments 52, 52 ... (filament aggregate) and superabsorbent polymer particles 54, 54 ... and wraps at least the back and side surfaces of the absorber 56 And 58. Further, a holding sheet 80 is provided between the absorbent body 56 and the rear surface side portion (lower portion) of the covering sheet 58.
  • the absorbent body 56 has an aggregate of filaments 52, 52.
  • superabsorbent polymer particles 54, 54 are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 52, 52. This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG. [0093] If there is no or very little SAP particles in the upper, lower, and intermediate parts of the absorber 56, it cannot be said that "absorbed throughout the thickness direction".
  • “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the filament aggregate in addition to the form“ uniformly ”distributed in the entire thickness direction. The force is still included in the upper, lower and middle parts.
  • a form in which some SAP particles remain on the surface of the filament 52, 52 ⁇ not entering the aggregate of filaments 52, 52 ⁇ Forms that pass through the body and are on the covering sheet 58 or on the holding sheet 80 are not excluded.
  • the aggregate of filaments 52, 52, ... is obtained by opening a tow (fiber bundle) composed of filaments (substantially continuous long fibers).
  • the filament material is not particularly limited as long as it can be heat-sealed.
  • polysaccharides or derivatives thereof cell mouth, cellulose ester, chitin, chitosan, etc.
  • synthetic polymers polyethylene
  • Polypropylene polyamide
  • polyester polylactaamide
  • polybutyrate polybutyrate
  • Cellulose esters and cellulose are particularly preferred.
  • cellulose cellulose derived from plants such as cotton, linter, and wood pulp, buttery cellulose, etc. can be used.
  • Regenerated cellulose which may be regenerated cellulose such as rayon, is spun. Also good.
  • cellulose esters examples include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more.
  • the viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800.
  • the average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
  • the average degree of polymerization of the cellulose ester is, for example, 10 to 1000, preferably 50 to 900.
  • the average substitution degree of the cellulose ester is, for example, about 1 to 3, preferably 1 to 2.15, and more preferably about 1.1 to 2.0. Can do.
  • the average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
  • an organic acid ester for example, an ester with an organic acid having about 2 to 4 carbon atoms
  • cellulose acetate is suitable.
  • the acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
  • a particularly preferred cellulose ester is cellulose diacetate.
  • the filament may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.
  • the fineness of the filament is, for example, 1 to 16 dex, preferably 1 to: LOdex, and more preferably 1 to 5 dex.
  • the filament may be a non-crimped fiber, but is preferably a crimped fiber.
  • the crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a highly integrated tow can be easily produced by entanglement between the fibers.
  • the cross-sectional shape of the filament is not particularly limited, and may be any of, for example, a circle, an ellipse, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape.
  • the filament has a shape of a tow (fiber bundle) formed by bundling 3,000 to 1,000,000, preferably ⁇ 5,000 to 1,000,000 single fibers. Used in.
  • the fiber bundle is preferably formed by concentrating about 3,000 to 1,000,000 filaments.
  • a binder having an action of adhering or fusing the contact portion of the filament can be used mainly for the purpose of maintaining the shape.
  • Binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various grease adhesives, especially heat Plastic resin can be used. Triacetin can be particularly preferably used.
  • the thermoplastic resin used as the binder is a resin that exhibits an adhesive force when melted and solidified, and includes water-insoluble or poorly water-soluble resin and water-soluble resin. Water-insoluble or poorly water-soluble rosin and water-soluble rosin can be used in combination as necessary.
  • water-insoluble or poorly water-soluble resins include olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, polybutyl acetate, and polymethacrylic acid.
  • Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene ⁇ , petroleum ⁇ ), such as hydrogen added hydrocarbon ⁇ can be used. These thermoplastic rosins can be used singly or in combination.
  • the water-soluble rosin has various water-soluble polymers such as polybulal alcohol, polypyrrole pyrrolidone, polybull ether, bulll monomer, carboxyl group, sulfonic acid group or a salt thereof.
  • Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used.
  • These water-soluble coagulants can be used alone or in combination of two or more.
  • thermoplastic resin Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.
  • tow can be produced by a known method, it will not be described in detail.
  • Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZcm 3 and a total weight of 400-600 kg.
  • the tow is peeled off and opened in a wide band shape so as to have a desired size and bulk.
  • the opening width of the tow is arbitrary, for example, a width of 100 to 2000 mm, preferably a product suction
  • the width of the collector can be about 100 to 300 mm.
  • the density of the absorbent can be adjusted by adjusting the degree of tow opening.
  • a method for opening a tow for example, a method in which the tow is spread over a plurality of opening rolls and the tow is gradually expanded as the tow progresses, and the tow tension (elongation) is used.
  • a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.
  • Superabsorbent polymer particles mean to include “powder” in addition to “particles”.
  • a material for the superabsorbent 14 polymer particles a material that can be used without any limitation is preferred that has a water absorption of 60 gZg or more.
  • superabsorbent polymer particles examples include starch-based, cellulose-based and synthetic polymer-based materials such as starch acrylic acid (salt) graft copolymer, saponified starch-acrylo-tolyl copolymer, sodium carboxymethylcellulose. Cross-linked products and acrylic acid (salt) polymers can be used.
  • shape of the superabsorbent polymer particles it is possible to use a powder or other shape which is suitable for a normally used granular material.
  • the superabsorbent polymer particles those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal of the liquid supplied into the absorbent body easily returns to the outside of the absorbent body.
  • the superabsorbent polymer particles those having a gel strength of lOOOPa or more are preferably used. Thereby, even when it is a case where it is set as a bulky absorber by using tow
  • the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber. Therefore, although it cannot be generally stated, it can be 50 to 350 gZm 2 .
  • the polymer basis weight By setting the polymer basis weight to 50 g / m 2 or less, it is possible to prevent the light weight effect from being exerted by adopting a tuca-like filament aggregate depending on the polymer weight. If 350gZm 2 is exceeded, the effect is saturated Excessive superabsorbent polymer particles give the above-mentioned crisp discomfort
  • the superabsorbent polymer particles can adjust the application density or the application amount in the plane direction of the absorbent body 56.
  • the amount of liquid excretion can be spread more than other parts.
  • men can increase the front spray density (quantity) and women can increase the center spray density (quantity).
  • a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 may be provided.
  • a plurality of superabsorbent polymer particles having different particle size distributions are prepared, and can be sequentially sprayed and projected in the thickness direction.
  • high-absorbent polymer particle spraying means for example, by disposing high-absorbent polymer particle spraying means at intervals in the direction of multiple lines, spraying the one with the small particle size distribution first and then spraying the one with the large particle size distribution. It is possible to distribute a small particle size distribution on the lower side in the absorber 56 and a large particle size distribution on the upper side. This form is effective for allowing a particle having a small particle size distribution to penetrate deeply into a filament assembly.
  • the ratio between the superabsorbent polymer particles and the filament aggregate affects the absorption characteristics.
  • a weight ratio in a planar area of 5 cm ⁇ 5 cm in the region directly receiving the liquid in the absorber 56 it is desirable that the superabsorbent polymer particle Z filament weight is 1 to 14, particularly 3 to 9.
  • a tissue pen particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape.
  • hydrophilic SMMS spunbond Z meltblown Z meltblown Z spunbond
  • non-woven fabrics instead of crepe paper
  • materials such as polypropylene and polyethylene Zpolypropylene can be used.
  • the basis weight is preferably 8 to 20 g / m 2 , particularly 10 to 15 g / m 2 .
  • this covering sheet 58 has a form that wraps the entire layer of the aggregates of filaments 52, 52 ... and superabsorbent polymer particles 54, 54 ... As shown, it may cover only the back and side surfaces of the layer. Although not shown, only the upper surface and side surface of the absorbent body 56 are covered with a crepe paper nonwoven fabric and the lower surface is liquid-impermeable such as polyethylene. It may be in the form of covering with a sheet, covering the upper surface of the absorbent body 56 with a crepe paper nonwoven fabric, and covering the side surface and the lower surface with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the covering sheet) Become).
  • the aggregate of the filaments 52, 52 ... and the superabsorbent polymer particles 54, 54 ... may be sandwiched between two upper and lower sheets or arranged only on the lower surface. This is not the desired form because it is difficult to prevent the migration of the superabsorbent polymer particles.
  • the liquid-impermeable sheet 70 simply means a sheet disposed on the back surface side of the absorber 56.
  • the liquid-impermeable sheet 70 is a sheet that interposes the absorber 56 with the top sheet 30.
  • the material of the liquid impermeable sheet is not particularly limited. Specifically, for example, polyolefin resin such as polyethylene or polypropylene, laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, and a nonwoven fabric that is substantially impervious to liquids by interposing a waterproof film (in this case Can be exemplified by a waterproof film and a non-woven fabric to form a liquid-impermeable sheet.
  • materials having liquid-impervious and moisture-permeable properties that have been favored and used in recent years from the viewpoint of preventing stuffiness can also be exemplified.
  • an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction.
  • the microporous sheets obtained as described above can be displayed.
  • the liquid impervious sheet 70 is a force that can prevent the liquid from leaking laterally (not shown) by extending it to the use surface in a so-called framed form.
  • the second liquid-impermeable sheet 72 is interposed between the double barrier sheets 64 forming the Noriya cuff 60. According to this configuration, the second liquid-impermeable sheet 72 extends until the Norriya cuff 60 stands up. Therefore, the liquid spread along the top sheet 30 and the barrier one-force huss 60, 60 are spread. There is also an advantage that side leakage of soft stool can be prevented.
  • Barrier force hose 60, 60 provided on both sides of the product is provided to prevent urine and loose stool that move laterally along the top sheet 30 and prevent side leakage. It is an additional element.
  • the illustrated non-cuff cuff 60 is a doubled water-repellent nonwoven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Is formed.
  • the side of the liquid-impermeable sheet 70 is inserted between the double nonwoven fabric sheets, and the barrier force that protrudes to the surface side It extends halfway through Hus 60.
  • the shape of the barrier first force hose 60 itself can be appropriately designed.
  • the cuffs 60 are erected by the contraction force during use.
  • the middle part of rubber thread 62 in the middle is positioned on the center side of thread rubbers 62 and 62 at the front end and fixed to the front and rear ends of topsheet 30.
  • the side is erected diagonally toward the center, and the tip end is inclined obliquely outward from the middle part.
  • the top sheet 30 extends from the top sheet 30 to the absorbent body 56 along the longitudinal direction at least on both sides of the wearer's crotch. Groove-shaped embossing reaching Em, Em is formed!
  • groove-shaped embosses Ec and Ec may be formed along a direction (in the embodiment, the width direction) intersecting the orientation direction of the aggregate of the filaments 52, 52.
  • the first embossed Em, Em formed on the both sides of the wearer's crotch portion in the substantially longitudinal direction
  • the second embossed formed on the front and rear portions of the absorber 56, Embossing Ec, Ec, the first embossing Em, Em and the second embossing Ec, Ec are substantially connected to form a substantially annular embossing.
  • embossing With regard to embossing, “almost along the longitudinal direction” means that the embossing is formed in a straight line, including an arc or curved line that extends along the longitudinal direction. As shown, it may have an appropriately shaped portion at the longitudinal end. That is, if the length along the longitudinal direction is substantially 5 cm or more, the present invention is effective. [0127]
  • the direction intersecting with the orientation direction of the aggregate of the filaments 52, 52... is not limited to being orthogonal to the longitudinal direction, and the direction is limited as long as it is the “intersecting direction”. As shown in Fig. 2, it may be formed with arcuate or curved embossing.
  • the embossing is preferably formed in such a form that the aggregate of the filaments 52, 52,... Is heat-sealed using a force formed only by pressing, an ultrasonic wave, a heat roll, or the like.
  • embossing has a groove shape
  • high pressing parts and low pressing parts may be alternately formed, and the embossed groove bottom may have irregularities, but is rather desirable.
  • groove-shaped embosses Ec 1 and Ec 2 in the width direction may be formed at the center and / or outside of the emboss Ec.
  • V may be formed by adding other embosses to the center side and / or the outside of the groove-like emboss Em.
  • the embossed formation region can be selected by the wearer according to gender.
  • Paper diapers are different in size for infants and adults, so although they cannot be uniquely defined by the length, they extend over the range of 1Z4 or more with respect to the longitudinal direction of the aggregate of filaments 52, 52 ... It is desirable to form over a range of 1Z3 or more in the width direction.
  • the SA P in the embossed Em, Em area, the embossed Ec, Ec area, or the substantially embossed area surrounded by the first embossed Em, Em and the second embossed Ec, Ec. Particle weight can be higher than other areas.
  • the liquid absorbability (mainly liquid absorption amount) after urination in that region can be increased.
  • the depth of the groove-like emboss reaches the absorber 56 as in the above embodiment.
  • the “reaching” degree can be up to the top of the absorber 56, up to the center of the absorber 56, or down to the bottom of the absorber 56.
  • the depth of the groove-like embossing is up to 30 parts of the top sheet, the top sheet 30 and the middle. Up to the 40th part of the sheet, the top sheet 30, the intermediate sheet 40, and the upper part of the covering sheet 58 are acceptable, but in order to increase the fit and the liquid absorption speed as in the above embodiment, the absorber 56 is reached. I like things! /.
  • the embossed Em the area between Em, the area between the embossed Ec, Ec, there is! /! Is a substantially annular shape surrounded by the first embossed Em, Em and the second embossed Ec, Ec.
  • the density of the aggregate of the filaments 52, 52... Is increased from other parts, the fit and the liquid absorption rate can be increased.
  • FIG.8 and FIG.9 has shown the example of the tape type disposable diaper.
  • FIG. 9 is a view taken along the line 9-9 in FIG. 8, but the absorbent main body 20 is slightly exaggerated.
  • the tape-type disposable diaper 10A has fastening pieces attached to both ends of the back side of the diaper, has a hook element on the fastening surface of the fastening piece, and constitutes the back side of the diaper.
  • a diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted.
  • the absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70.
  • the absorbent body 56 is entirely wrapped with a covering sheet 58 made of tissue paper, and has a rectangular shape in plan view.
  • a holding sheet 80 is provided between the absorbent body 56 and the covering sheet 58.
  • the intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56.
  • the liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.
  • the top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.
  • a barrier force hose 60A protruding toward the use surface side is formed on both sides of the diaper.
  • This noir cuff 60A has a non-woven sheet 64 which also has a non-woven fabric force substantially continuous in the width direction, and an elastic expansion and contraction. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is fasting with hook and loop fasteners It is a piece.
  • the inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and the fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive.
  • the outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.
  • the starting end of the inner surface of the NORY sheet 64 fixed to the liquid-impermeable sheet 70 forms an upright end of the NORY cuff 60A.
  • the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.
  • the fastening piece 130 by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.
  • a base portion of a fastening base material such as plastic, polylaminated nonwoven fabric, or paper is joined to the back sheet 12A, for example, with an adhesive, and has a hook element 130A on the tip side.
  • the hook element 130A is bonded to the fastening substrate with an adhesive.
  • the hook element 130A has a large number of engaging pieces on the outer surface side thereof.
  • a temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body.
  • the fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.
  • a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A on the opening side of the front body, and serves as a guide for fixing the hook element 130A of the fastening piece 130.
  • the target print with the design is made and made visible through the back sheet 12A from the outside.
  • the diaper When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. Stand up.
  • the space surrounded by the standing part forms a confined space for urine or soft stool.
  • the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented.
  • side leakage is prevented by a stop function by the flat contact part.
  • the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable).
  • the top sheet (nonwoven fabric laminate) of the present invention may have a property of repelling liquid by silicon treatment or the like.
  • the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.
  • a sheet of 2 o or more is preferable. As a result, air permeability is exhibited at the side portion in the width direction of the product, and the wearer's stuffiness can be prevented.
  • first embossed Em, Em formed in the longitudinal direction on both sides of the wearer's crotch, and the second embossed Ec formed on the front and rear portions of the absorber 56,
  • the first emboss Em, Em and the second emboss Ec, Ec are substantially connected to form a substantially annular emboss.
  • Other modified examples can be employed in the same manner as the above-described pants-type.
  • FIG. 10 shows an example of a pants-type disposable diaper.
  • This pants-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent main body 20, and the absorbent main body 20 is fixed to the outer sheet 12. .
  • the absorbent main body 20 is a part that receives and absorbs and holds liquids such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later).
  • the exterior sheet 12 is a part for attaching to the wearer.
  • the exterior sheet 12 has a trunk periphery 12T that is determined as a front-rear direction range that also reaches the upper end of the leg opening LO, and a middle opening 12L that is determined as a front-rear direction range of a portion that forms the leg opening LO. .
  • the waistline portion 12T can be conceptually divided into a “trunk upper end” 12W and a “trunk bottom” 12U.
  • the length in the front-rear direction varies depending on the size of the product, and the force that can be determined as appropriate.
  • the waist upper end 12W can be 15-40 mm and the waist lower 12U can be 65-120 mm. .
  • both side edges of the intermediate portion 12L are bound along the circumference of the legs of the wearer, and this is a part where the wearer's legs are put.
  • the exterior sheet 12 has a substantially hourglass shape as a whole.
  • the width force of the outer sheet 12 at the crotch portion is shorter than the absorbent main body 20. The relationship of this width may be reversed or the same width.
  • the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed in place, and both sides of the front body 12F and the back body 12B of the exterior sheet 12
  • the joining region 12A is joined by heat fusion or the like.
  • a pants-type disposable diaper having the structure shown in FIG. 10 and having a waist opening WO and a pair of redder openings LO is obtained.
  • the exterior sheet 12 may be formed of a single-layer sheet, but is preferably formed of a two-layer sheet in which an outer layer and an inner layer are bonded together with an adhesive such as a hot melt adhesive.
  • the outer layer and the inner layer can be used without any particular limitation, but it is preferable to use a water-repellent nonwoven fabric from the viewpoint of touch and waterproofness.
  • Each of the outer layer and the inner layer may be formed by laminating a plurality of materials.
  • the thicknesses of the outer layer and the inner layer can be determined as appropriate, but the thickness of the outer layer is preferably equal to or greater than the thickness of the inner layer.
  • the outer layer and the inner layer preferably each have a basis weight in the range of 5 to 30 g / m 2 . Further, the thickness of the outer layer 12S is preferably 5 mm or less, and the thickness of the inner layer is preferably lmm or less.
  • the elastic sheet 12C, 12D is fixed to the exterior sheet 12 with a hot melt adhesive or the like in an expanded state.
  • the elastic elastic members 12C and 12D can be used without particular limitation as long as they are long and narrow rubber materials such as threads, strings, and strips.
  • the waist elastic elastic member 12C extending along the width direction is spaced a predetermined distance in the front-rear direction between the outer layer and the inner layer in the waist lower portion 12U of the exterior sheet 12. Many, for example, about 15 to 40 are provided in parallel.
  • the waist elastic elastic member 12C is cut at the portion overlapping the absorbent main body 20 by embossing force needle piercing or the like, or there is a waist around the portion overlapping the absorbent main body 20
  • the contraction force can be eliminated or weakened.
  • a large number of points may be cut at a predetermined interval in the width direction, or only one point may be cut.
  • the elastic expansion / contraction member 12C is discontinuous in the portion (either part or all) that overlaps the absorbent main body 20, the contraction force acting on the absorbent main body 20 is eliminated or weakened.
  • the width of the cut or missing portion of the elastic elastic member 12C can be determined as appropriate. Also, unlike the illustrated embodiment, the waist elastic elastic member 12C can be made discontinuous only in one of the back side B and the ventral side F.
  • the thickness and arrangement interval of the waist elastic elastic member 12C can be determined as appropriate, but preferably the thickness is lOOOOdtex or less, particularly 700 to 400 dtex, and the arrangement interval is l to 20 mm, especially 1 to 10 mm. Is done.
  • the outer layer is folded back inside the exterior sheet 12 at the trunk opening WO, and the end of the trunk opening WO is between the folded portion and the exterior sheet 12.
  • the body end elastic elastic member 12D is fixed in an extended state with a space parallel to the edge.
  • the thickness, interval, and number of the trunk end elastic members 12D can be determined as appropriate.
  • the thickness is preferably 400 to 900 dtex, the interval is 3 to 6 mm, and the number is preferably about 4 to 10.
  • the absorbent main body 20 includes a liquid-permeable top sheet 30, a liquid-impermeable sheet (also referred to as a back sheet) 70, and an absorbent element 50 interposed therebetween. ing. On the back side of the liquid-impermeable sheet 70, the above-described exterior sheet 12 is provided. Furthermore, on both sides of the absorbent main body 20, there are provided noir cuffs 60, 60 which protrude toward the use surface side.
  • the top sheet 30 can be formed using a liquid-permeable material.
  • a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like can be used.
  • Non-woven fabrics are not limited by raw material fibers, for example, polyolefins such as polyethylene and polypropylene, synthetic fibers such as polyesters and polyamides, regenerated fibers such as rayon cupra, natural fibers such as cotton, etc.
  • a mixed fiber or a composite fiber in which two or more of these are used can be used.
  • the nonwoven fabric is not limited by the production method, and is produced by a known method such as 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, etc. Things can be used.
  • the thermal bond method is the preferred cache method if the bulkiness and softness preferred by the span lace method are desired if flexibility and drapeability are desired.
  • the top sheet 30 may be a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.
  • the liquid-impermeable sheet 70 is a sheet disposed on the back side of the absorber 56.
  • the material of the liquid-impermeable sheet is not particularly limited.
  • an olefin-based resin such as polyethylene or polypropylene
  • a non-woven fabric that is substantially impervious to liquid in this case, a waterproof film and a non-woven fabric constitute a liquid-impermeable sheet
  • materials having liquid-impervious and moisture-permeable properties that have been used in recent years because of their ability to prevent stuffiness can also be exemplified.
  • an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, and the sheet is formed.
  • an olefin-based resin such as polyethylene or polypropylene
  • An example of the microporous sheet obtained by stretching is as follows.
  • Absorbing element 50 consists of lower layer absorber 56B and upper layer absorbent provided on the top sheet 30 side.
  • 56A of which the upper absorbent body 56A is obtained by opening the tow and is formed of an aggregate of hardly absorbable filaments 52 having an absorption amount of 1.0 times or less of its own weight.
  • the filament 52 of the upper layer absorbent body 56A extends along the top sheet 30 in the illustrated direction in the front-rear direction, and as shown in FIG. 11, both ends (tip and base ends) of the filament 52 are absorbed by the lower layer.
  • the body 56B is spaced inward from the leading and trailing edges (periphery of the absorbent element 50).
  • the distance y between the both ends of the filament 52 (the front edge and the rear edge of the upper layer absorbent body 56A) and the front edge and the rear edge of the lower layer absorbent body 56B varies depending on the target wearer, so it can be said in general. Although it is not, it is desirable that it is 10 to 300 mm, particularly 50 to 150 mm. If the separation distance y is too short, the effect of preventing leakage will be poor, and if it is too long, the diffusion distance by the upper absorber 56A will be short, and the diffusion performance may be poor.
  • the upper-layer absorbent body 56A is separated from both side edges of the lower-layer absorbent body 56B not only at both ends of the filament 52 but also at both side edges.
  • this separation distance X varies depending on the target wearer, it cannot be generally stated, but it is preferably 0 to 90 mm, particularly preferably 0 to 50 mm.
  • the length of the upper layer absorber 56A that is preferably 200 to 600 mm in length and 100 to 180 mm in width is preferably 100 to 500 mm in width and width 50 to 120 mm is preferable.
  • the assembly of the filaments 52 constituting the upper-layer absorber 56A is a bundle-like assembly, and is likely to be broken or out of shape. Therefore, in order to facilitate the handling in production, as shown in FIG. 12, the liquid permeable sheet 40 is attached to the side surface of the top sheet 30 of the upper absorbent body 56A using a hot melt adhesive or the like. As shown in Fig. 14, the entire periphery (front and back and both sides) of the upper absorbent body 56A is integrally wrapped with a liquid permeable sheet 40, or as shown in Fig. 14, the liquid permeable sheet is placed on the back surface of the upper absorbent body 56A. 41 is preferably pasted using a hot melt adhesive or the like. In the case of the former two, a part or all of the liquid-permeable sheet 40 will be described later. Intermediate sheet. In either case, a separate topsheet 3
  • An intermediate sheet can be provided between 0 and the upper absorber 56A.
  • the hardly absorbent filament aggregate constituting the upper layer absorbent body 56A can be produced by opening a tow (fiber bundle) composed of hardly absorbent filaments (substantially continuous long fibers). Filament 52 can extend along any direction, such as the longitudinal, width, or thickness direction of the article.
  • the material of the hardly absorbable filament 52 can be used without particular limitation if the absorbed amount is 1.0 times or less of its own weight.
  • polysaccharides or derivatives thereof cellulose, cellulose ester, chitin, Chitosan, etc.
  • synthetic polymers polyethylene, polypropylene, polyamide
  • Polyester polylactamamide, polybutyrate, etc.
  • Cellulose esters and cellulose are particularly preferred.
  • cellulose cellulose derived from plants such as cotton, linter and wood pulp, butterfly cellulose, etc. can be used. Regenerated cellulose such as rayon can be used as a spinning fiber. Also good.
  • Examples of the cellulose ester that can be suitably employed include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more.
  • the viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800.
  • the average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
  • the average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3. It is preferably about 1 to 2.15, more preferably about 1.1 to 2.0.
  • the average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
  • an organic acid ester for example, an ester with an organic acid having about 2 to 4 carbon atoms
  • particularly cellulose acetate is suitable.
  • the absorbed amount is about 0.1 to 0.3 times its own weight.
  • the acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
  • a particularly preferred cellulose ester is cellulose diacetate.
  • the hardly absorbent filament may contain various additives such as a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver, and the like.
  • the fineness of the hardly absorbable filament is, for example, 1 to 16 dtex, preferably 1 to: LOdtex, and more preferably 1 to 5 dtex.
  • the filament may be a non-crimped fiber, but is preferably a crimped fiber.
  • the crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch.
  • crimped fibers that are uniformly crimped are often used. When crimped fibers are used, a bulky and lightweight absorbent body can be produced, and a highly integrated tow can be easily produced by entanglement between the fibers.
  • the cross-sectional shape of the filament is not particularly limited, and may be any shape such as a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape.
  • the flame noodles are in the form of a tow (fiber bundle) formed by bundling 3,000 to 1,000,000, preferably ⁇ 5,000 to 1,000,000 single fibers. Used in.
  • the fiber bundle is preferably formed by concentrating about 3,000-1,000,000 filaments.
  • Binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various grease adhesives, especially heat Plastic resin can be used.
  • thermoplastic resin used as the binder is a resin that exhibits an adhesive force upon melting and solidification, and includes a water-insoluble or hardly water-soluble resin and a water-soluble resin. Water insoluble The water-soluble or poorly water-soluble rosin and the water-soluble rosin can be used together as necessary.
  • water-insoluble or poorly water-soluble resins include olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, poly (butyl acetate), and polymethacrylic acid.
  • olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, poly (butyl acetate), and polymethacrylic acid.
  • Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene ⁇ , petroleum ⁇ ), such as hydrogen added hydrocarbon ⁇ can be used. These thermoplastic rosins can be used singly or in combination.
  • the water-soluble rosin has various water-soluble polymers such as polybutyl alcohol, polypyrrole pyrrolidone, polybutyl ether, bulle monomer, carboxyl group, sulfonic acid group or salts thereof.
  • Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used.
  • These water-soluble coagulants can be used alone or in combination of two or more.
  • thermoplastic resin Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.
  • the tow can be produced by a known method, it will not be described in detail.
  • Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZcm 3 and a total weight of 400-600 kg.
  • the tow is peeled off and opened in a wide band shape so as to have a desired size and bulk.
  • the opening width of the tow is arbitrary, and may be, for example, a width of 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the product absorber. Further, the density of the absorbent can be adjusted by adjusting the degree of tow opening.
  • Examples of the method for opening the tow include a method in which the tow is passed over a plurality of opening rolls, and the tow is gradually widened as the tow progresses, and the tow is stretched (elongated). For example, a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.
  • the upper-layer absorber 56A preferably does not contain superabsorbent polymer particles, but can also be contained. Details of the superabsorbent polymer particles will be described later.
  • the lower layer absorbent body 56B is a general-purpose absorbent body obtained by mixing pulp fibers 55 and superabsorbent polymer particles 54 and stacking them in a cotton form.
  • the lower layer absorbent body 56B can be formed in a rectangular shape like the upper layer absorbent body. However, as shown in the example in the figure, both sides of the crotch part are cut out in an arc shape around the legs! You can also
  • the superabsorbent polymer particles 54 include “powder” in addition to “particles".
  • the particle size of the superabsorbent polymer particles 54 is not particularly limited, but is preferably 100 to 1000 / ⁇ ⁇ , particularly 150 to 400 ⁇ m.
  • the water absorption amount of the superabsorbent polymer particles 54 is not particularly limited, but is preferably 40 gZg or more.
  • the superabsorbent polymer particles 54 include starch, cellulose, and synthetic polymers, such as starch acrylic acid (salt) graft copolymer, starch acrylonitrile copolymer, carboxymethyl cellulose, and sodium carboxymethyl cellulose. Cross-linked products and acrylic acid (salt) polymers can be used.
  • As the shape of the superabsorbent polymer particles 54 a normally used granular material is suitable. Other shapes can also be used.
  • the superabsorbent polymer particles 54 those having a water absorption speed of 0 second or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal that the liquid supplied into the absorber 56 returns to the outside of the absorber easily occurs.
  • the superabsorbent polymer particles 54 those having a gel strength of lOOOPa or more are preferably used. As a result, the stickiness after absorbing the liquid can be effectively suppressed.
  • the basis weight of the superabsorbent polymer particles 54 in the lower layer absorbent body 56B can be appropriately determined according to the amount of absorption required for the use of the absorbent body. Therefore, although it cannot be generally stated, it can be 50 to 350 gZm 2 . By reducing the basis weight of the superabsorbent polymer particles 54 to 50 gZm 2 or less, the weight of the superabsorbent polymer particles 54 is reduced. It is possible to prevent the fruit from becoming difficult to be exhibited. Above 350 gZm 2 , the excess of superabsorbent polymer particles 54, which just saturates the effect, gives a gritty feeling when touching the product.
  • the density or amount of the superabsorbent polymer particles 54 can be adjusted in the plane direction of the lower layer absorbent body 56B. For example, a larger amount of superabsorbent polymer particles 54 can be present at the excretion site than at other sites.
  • men can increase the density (amount) on the front side, and women can increase the density (amount) in the center. Further, it is also possible to provide a portion where the superabsorbent polymer particles 54 do not exist locally (for example, in a spot shape) in the planar direction of the lower layer absorber 56B.
  • the superabsorbent polymer particles 54 are contained in the lower layer absorbent body 56B, it is preferably wrapped with a covering sheet 58. The same applies to the case where the superabsorbent polymer particles 54 are contained in the upper layer absorbent body 56A.
  • This covering sheet 58 is also a component of the absorbent element 50.
  • a tissue peno particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, and the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape.
  • hydrophilic SMMS spunbond Z meltblown Z meltblown Z spunbond
  • non-woven fabrics instead of crepe paper
  • materials such as polypropylene and polyethylene Zpolypropylene can be used.
  • the basis weight is preferably 8 to 20 g / m 2 , particularly 10 to 15 g / m 2 .
  • the covering sheet 58 may adopt a form in which only the lower layer absorbent body 56B is wrapped as shown in FIG. 12, and a form in which the upper layer absorbent body 56A and the lower layer absorbent body 56B are wrapped together as shown in FIG. it can. Further, it is desirable that the covering sheet 58 wraps the entire object as shown in FIG. 12, but it is also possible to wrap only the back and side surfaces of the object (not shown).
  • an intermediate sheet that has a higher liquid permeation speed than the top sheet 30 so that it directly contacts the back surface of the top sheet 30. 40
  • This intermediate sheet 40 is also a component of the absorption element 50. The intermediate sheet 40 quickly transfers the liquid to the upper absorber 56A. When the absorption performance is increased, the “returning” phenomenon of the absorbed liquid by force is prevented.
  • the intermediate sheet 40 the same material as the top sheet 30, spun lace, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper can be used. Air-through nonwoven fabric and spunbond nonwoven fabric are particularly preferred.
  • the intermediate sheet (second sheet) 40 is arranged in contact with the back surface of the top sheet 30.
  • An intermediate sheet (second sheet) 40 may be omitted.
  • the intermediate sheet 40 is preferably narrower than the absorbent element 50 and arranged in the center as shown in the figure, but it may be provided over the entire width of the absorbent element 50.
  • the length in the front-rear direction of the intermediate sheet 40 may be the same as the length of the absorbent element 50, or may be within a short length range centered on the excretory part.
  • the width and length of the intermediate sheet 40 are preferably the same as the width and length of the upper absorbent body 56A.
  • the lower absorbent body 56B or A holding sheet 80 can be provided between the back surface of the absorbent body 56 and the back surface side portion (lower portion) of the covering sheet 58.
  • This holding sheet 80 is also a component of the absorbent element 50.
  • the holding sheet 80 is not an essential component and therefore may not be provided.
  • the superabsorbent polymer particles 54 may move during the manufacturing process or through the flow path until use by the consumer. For example, when the superabsorbent polymer particles 54 are mixed in the lower layer absorber 56B, the superabsorbent polymer particles 54 may fall out from the lower layer absorber 56B. The unevenness of the superabsorbent polymer particles that have fallen out gives a sense of incongruity when touched by the hand when a consumer uses it. For this problem, if a holding sheet 80 having a holding capacity of the absorbent polymer is interposed on the back side of the part where the superabsorbent polymer particles 54 are disposed, the stiffness that is not sufficient only by the covering sheet 58 is reinforced. Thus, when the consumer touches it when using it, it reduces or prevents discomfort.
  • the material of the holding sheet 80 is not particularly limited, and the holding performance of the superabsorbent polymer particles 54 It is enough if you have it.
  • non-woven fabric, crimped pulp, low-absorbency cotton fiber for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or hydrophobizing agent, etc.
  • Examples include polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, and acetate fiber.
  • the holding sheet 80 When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy based on the KES test of 0.01 to: LO. OOgfcm / cm 2 , preferably 0.01 to: L OOgfcm / cm 2 And a compression resilience of 10 to 100%, preferably 70 to 100%.
  • the reason for providing the holding sheet 80 is, for example, to hold the superabsorbent polymer particles 54 that have fallen down (dropped out) from the absorber 56. Accordingly, since the superabsorbent polymer particles 54 that have come out come into contact with the user via the covering sheet 58 and the holding sheet 80, there is no possibility of being transmitted to the user as a sense of incongruity. In particular, a non-woven fabric having the above compression energy and compression resilience exhibits a sufficient holding function.
  • the superabsorbent polymer particles 54 that have escaped are held by the holding sheet 80 and do not move on the covering sheet 58, there is no possibility of uneven distribution of absorption capacity.
  • an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance.
  • the superabsorbent polymer particles 54 may be prevented from moving on the holding sheet 80.
  • roughening or fluffing means for this purpose, non-net surface that is not the net surface at the time of manufacturing the nonwoven fabric, marble force check, processing by needle punch, brushing check, etc. can be mentioned. Can do.
  • the holding sheet 80 may be provided only below the absorber 56 as shown in Fig. 15 or the like, and although not shown, the holding sheet 80 passes through the side surface of the absorber 56 and is wound up to the upper surface of the absorber 56 so as to extend. It's okay. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
  • the holding sheet 80 is provided between the absorbent body 56 and the back surface portion of the covering sheet 58.
  • the force holding sheet 80 as an example may be on the back side from the covering sheet 58 (the form is not shown). In short, if the holding sheet 80 is provided on the back side with respect to the absorber 56, , The rear surface force of the product will reduce or not cause a crisp discomfort when touching.
  • a fiber assembly having a larger amount of absorption than the hardly absorbent filament assembly for example, the amount of absorption is about 5 to 30 times. It is preferable to form the holding sheet 80 using a fiber assembly because the holding sheet 80 can supplement the water absorption performance of the absorbent body 56 and improve the initial absorption rate and diffusibility.
  • the lower absorbent body 56B of the absorbent element 50 is preferably a mixed product of pulp fibers 55 and superabsorbent polymer particles 54 as in the above example, but it is difficult to absorb the same as the upper absorbent body 56A.
  • Superabsorbent polymer particles 54 can also be included in the aggregate of filaments 52. In this case, it is desirable that the superabsorbent polymer particles 54 are dispersed substantially throughout the thickness direction with respect to the aggregate of filaments 52. This substantially dispersed state in the entire thickness direction is conceptually shown in the enlarged view of the main part in FIG.
  • the superabsorbent polymer particles 54 are not present in the upper part, lower part, and middle part of the filament aggregate, or if there are very few, it cannot be said that the filament aggregate is dispersed throughout the thickness direction. . Therefore, “distributed throughout the thickness direction” means that the filament aggregate is “evenly distributed” throughout the thickness direction, and is “distributed unevenly in the upper, lower and / or middle portions”. However, it is still included in the form of being dispersed in the upper, lower and middle parts. Further, a form in which some highly absorbent polymer particles 54 remain on the surface of the filament aggregate, or a form in which some highly absorbent polymer particles 54 fall off the filament aggregate force and are on the covering sheet 58. The form on the holding sheet 80 is not excluded.
  • the absorbing element 50 may have a structure having a single-layer absorber 56 that also has the above-mentioned hardly-absorbing filament assembly force.
  • the separation distance from the peripheral edge of the absorbent element 50 at both ends of the filament that is, the separation distance between the front edge and the rear edge of the absorbent body 56 and the front edge and the rear edge of the absorbent element 50 is 10 to 125 mm. Desirably, 50 to 125 mm is particularly desirable. If this distance is too short, the leakage prevention effect may be poor.
  • Others are basically the same as the above-described upper layer absorbent body 56A, and it is possible to adopt an appropriate configuration such as attaching a liquid permeable sheet such as the second sheet 40 or providing an embossed recess F described later. .
  • the absorbent element 50 may have a structure having three or more layers of absorbers.
  • one or a plurality of absorbent bodies located on the top sheet 30 side is formed of the above-mentioned hardly absorbent filament aggregate.
  • the upper absorber and the lower absorber are arranged upside down with respect to the embodiment shown in Fig. 12 and the like, that is, although not shown, the lower absorber is a hardly absorbing filament.
  • a form is also proposed in which both ends of the filament are separated from the periphery of the upper absorbent body to the inside due to the aggregate force. Except for upside down, it is basically the same as the previous embodiment.
  • the absorbent element 50 When a plurality of absorbers are stacked as the absorbent element 50, all of them may have the same material configuration, or one or a plurality of layers may have different material configurations with respect to other layers. it can. Moreover, it is preferable that the superabsorbent polymer particles have no power layer regardless of the number of layers.
  • Barrier force hose 60, 60 provided on both sides of the product is provided to prevent urine and loose stool moving laterally along the top sheet 30 and to prevent side leakage.
  • the illustrated non-cuff cuff 60 is a doubled water-repellent non-woven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Is formed.
  • the second liquid-impermeable sheet 72 is inserted between the double nonwoven fabric sheets, and extends to the middle of the noir cuff 60 projecting to the surface side.
  • the shape of the barrier cuff 60 itself can be designed appropriately.
  • an elastic elastic member for example, rubber thread 62 is stretched at the tip and middle of the protrusion of the barrier cuff 60.
  • the cuffs 60 are erected by the contraction force during use.
  • the intermediate rubber thread 62 is positioned closer to the center than the front rubber threads 62, 62 and is fixed to the front and rear end portions of the top sheet 30 as shown in FIG.
  • the cuff 60 has a configuration in which the base side of the cuff 60 is erected obliquely with a force toward the center, and the tip part of the cuff 60 is erected diagonally outward from the middle part.
  • recesses E and F by embossing may be formed in the surface side force thickness direction of the top sheet 30.
  • the embossed recess E is formed only on the top sheet 30; although not shown, the embossed recess is formed only on both the top sheet 30 and the intermediate sheet 40.
  • the embossed recess F can be formed so as to reach a part or almost the entire thickness of the absorber 56A (or 56B) from the surface side of the top sheet 30.
  • the intermediate sheet 40 has a basis weight of 8 to 60 gZm 2 , a thickness of 0.2 to 1.5 mm, and the top sheet 30 has a basis weight of 15
  • the range of ⁇ 80gZm 2 and the thickness of 0.2 ⁇ 3.5mm is preferable because sufficient embossing force can be obtained under the condition that the liquid permeability is not hindered.
  • a recess by embossing may be formed only in the intermediate sheet 40 without forming a recess in the top sheet 30. Further, a recess may be formed in the top sheet 30 and the intermediate sheet 40. The embossed recess may be formed only in the absorbent element 56, or the embossed recess may be formed only in the absorbent body 58 without forming the recess in the top sheet 30, the intermediate sheet 40, and the covering sheet 58.
  • a recess by embossing can be formed in the thickness direction of the back surface side force.
  • Such recesses are embossed so as to reach any member from the back side of the holding sheet 80, the covering sheet 58, the liquid-impermeable sheet 70 or the exterior sheet 12 to the top sheet 30.
  • such a recess on the back surface side is preferably formed together with the recess E on the front surface side, but only the recess on the back surface side can be formed without forming the recess E on the front surface side.
  • the shape of the recesses may be common to the front and back sides, or may be different from each other. In this case, the embossing force may be applied simultaneously on the front and back with the product sandwiched between the engraving roll and the engraving roll.
  • the recesses E and F by embossing have the effect of inducing and diffusing liquid in the extending direction. It also has the effect of increasing rigidity. Therefore, it is desirable to determine the shape of the recesses E and F by embossing in consideration of these effects.
  • the recess is substantially continuous in a groove shape (compound In addition to a case in which a plurality of recesses are arranged in a row at intervals and a single groove is formed), a plurality of recesses may be arranged in the form of dots at intervals.
  • planar pattern groove-shaped or dot-shaped concave portions are arranged in the longitudinal direction, the width direction, a lattice shape combining these, a zigzag shape that reciprocates in the width direction (staggered shape), or irregularly.
  • a lattice shape combining these, a zigzag shape that reciprocates in the width direction (staggered shape), or irregularly.
  • an appropriate form such as a pin shape, a Mt. Fuji shape, or a bellows shape can be employed.
  • the embossed recess is preferably formed in a planar pattern as shown in FIG. 11 so that the surface side force of the top sheet 30 reaches the upper absorber 56A as shown in FIG.
  • the embossed recesses F of this planar pattern have arc-shaped portions that extend along the front-rear direction at least on both sides of the crotch part, and have a middle part in the front-rear direction bulge toward the center in the width direction.
  • the use surface at the center in the width direction is raised from both sides, and the fit between the crotch and the crack can be improved.
  • the front and rear end portions of the inner arc-shaped portion are connected by a portion extending in the width direction, and the excretion site is surrounded by the annular embossed recess F. Further, a plurality of arc-shaped portions on both sides are formed at intervals in the width direction as shown in the figure. As a result, unnecessary diffusion of the liquid is suppressed by the embossed recess F, and the leakage prevention effect is excellent.
  • the constituent members of the absorbent main body 20 can be fixed to each other by a solid such as a hot melt adhesive, a bead, or spiral coating.
  • FIG.18 and FIG.19 has shown the example of the tape type disposable diaper.
  • FIG. 19 shows a slightly exaggerated view of the force-absorbing main body 20 shown in FIG.
  • the tape-type disposable diaper 10A has fastening pieces attached to both ends of the back side of the diaper, has a hook element on the fastening surface of the fastening piece, and constitutes the back side of the diaper.
  • a diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted.
  • the absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70.
  • the absorbent body 56 is entirely wrapped by a covering sheet 58, and has a rectangular shape in plan view.
  • a holding sheet 80 is provided between the absorber 56 and the covering sheet 58! /.
  • an intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56.
  • the liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.
  • the top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.
  • a barrier one-force hull 60A that protrudes toward the use surface side is formed.
  • This noir cuff 60A has a non-woven sheet 64 that also has a non-woven fabric force substantially continuous in the width direction, and an elastic expansion and contraction. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is a fasting piece with a hook-and-loop fastener.
  • the inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and the fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive.
  • the outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.
  • the starting end of the inner surface of the NORY sheet 64 fixed to the liquid-impermeable sheet 70 forms an upright end of the NORY cuff 60A.
  • the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.
  • the fastening piece 130 by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.
  • the fastening part 130 has a base of a fastening base material such as plastic, polylaminated nonwoven fabric, or paper, joined to the back sheet 12A, for example, with an adhesive, and has a hook on the tip side. It has element 130A.
  • the hook element 130A is bonded to the fastening substrate with an adhesive.
  • the hook element 130A has a large number of engaging pieces on the outer surface side thereof.
  • a temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body.
  • the fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.
  • a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A, and serves as a guide for fixing the hook element 130A of the fastening piece 130.
  • the target print with the design is made and made visible through the back sheet 12A from the outside.
  • the diaper When the diaper is attached, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. To do.
  • the space surrounded by the standing part forms a confined space for urine or soft stool.
  • the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented.
  • side leakage is prevented by a stop function by the flat contact part.
  • the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable).
  • the top sheet (nonwoven fabric laminate) of the present invention may have a property of repelling liquid by silicon treatment or the like.
  • the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.
  • a sheet of 2 o or more is preferable. As a result, air permeability is exhibited at the side portion in the width direction of the product, and the wearer's stuffiness can be prevented.
  • FIG. 20 shows a manufacturing process example of the absorbent element 50 shown in FIG. 12, FIG.
  • the covering sheet 58 is also supplied to the line with upstream force, and when the holding sheet 80 is provided next, the holding sheet 80 is supplied.
  • an adhesive such as a hot-melt adhesive having adhesiveness can be applied in advance to fix the lower layer absorbent body 56B supplied later.
  • the lower absorbent body 56B force formed by mixing and stacking the pulp fibers 55 and the superabsorbent polymer particles 54 in the stacking drum device 91 intermittently the covering sheet 58 or holding Supplied on sheet 80. Thereafter, the lower layer absorbent body 56B is wrapped by the covering sheet 58 by passing through the sailor 92.
  • the intermediate sheet 40 is supplied and an adhesive such as a hot melt adhesive is applied from the nozzle 95 to the upper surface of the intermediate sheet 40
  • the upper absorbent body 56A is formed on the upper surface of the intermediate sheet 40.
  • the hardly absorbable filament aggregate 52Z formed by opening the tow 52Y is supplied and pasted. Details of the opening process will be described later.
  • the intermediate sheet 40 wider than the upper absorbent body 56A is used, and the hardly absorbent filament aggregate 52Z is disposed on the intermediate sheet 40, and then both sides of the intermediate sheet are attached using a sailor.
  • the absorbent element shown in FIG. 13 can be manufactured by folding back and wrapping on the upper surface of the hardly absorbent filament aggregate 52Z.
  • the SAP supply device 90 uses the SAP absorbent device 90 to attach the hardly absorbent filament aggregate after the fiber is opened and prior to pasting to the lower absorbent body 56B.
  • 52Z can contain superabsorbent polymer particles. An example of the SAP supply device 90 will be described later.
  • the hardly absorbent filament aggregate 52Z having the intermediate sheet 40 attached to the lower surface is cut into a predetermined length by a cutting and sticking device 93 such as a slip cutter, and the cut hardly absorbed
  • the conductive filament aggregate is affixed intermittently on the lower layer absorber 56B. In other words, it is cut at a predetermined position on the lower absorber 56B that is transported at a predetermined interval.
  • the hardly absorbable filament aggregates are sequentially attached.
  • the intermediate sheet 40 in front of the cutting and sticking device 93, the intermediate sheet 40 is at the bottom and the hardly absorbent filament aggregate 52Z is at the top.
  • the intermediate sheet 40 is on the upper side and the hardly absorbent filament aggregate 52Z is on the lower side, resulting in the form shown in FIG.
  • the configuration is the same as that shown in FIG.
  • the lower layer absorber 56B to which the upper layer absorber 56A is affixed is then divided in the transport direction by the cutter device 94 to form individual absorption elements 50.
  • the constituent elements of the barrier force hose 60 and the top sheet 30 are supplied from above, and the liquid-impervious sheet 70 is also supplied in the downward direction.
  • the supply line of the NORY sheet 64 constituting the NORY cuff 60 the rubber thread 62 is stretched between the two non-woven fabrics and the second liquid impermeable sheet 72 is fixed in advance by a device (not shown). Is supplied to the main line together with the top sheet 30.
  • the components of the noir cuff 60 supplied to the main line, the top sheet 30 and the liquid-impermeable sheet 70 are folded into a shape shown in FIG.
  • the absorptive main body 20 having a rectangular shape whose longitudinal direction is along the conveying direction is cut by the cutter device 98.
  • the obtained absorbent main body 20 is turned 90 degrees by the turning device 100 so that the longitudinal direction of the absorbent main body 20 is orthogonal to the line.
  • the thread rubber 12C flows in advance (not shown) between two non-woven sheets, and a cutter (not shown) is used to form a leg-surrounding portion.
  • the absorbent main body 20 that has been turned around is installed between the cut-out portions, and is fixed with a hot-melt adhesive or the like. Combined. After that, it is folded up and down with the horizontal line as a boundary, and the joining regions 12A on both sides of the front body 12F and the back body 12B of the exterior sheet 12 are joined by heat fusion or the like. Thereafter, the product is divided in the line direction (separation means is not shown), and individual products are obtained. [0251] (In the case of tape-type disposable diapers)
  • FIG. 22 shows an example of a method for manufacturing the tape-type disposable diaper shown in FIGS.
  • the individual absorbent element 50 is obtained, it is the same as in the case of the pants type.
  • the top sheet 30 is supplied to the individual absorbent elements from above, and the liquid-impervious sheet 70 is also supplied to the downward force.
  • the noir sheet 64 constituting the noir cuff 60 is supplied.
  • supply line of the noir sheet 64 supply is performed in a state where the rubber thread 62 is fixed under tension between two nonwoven fabrics by a device (not shown).
  • the semi-finished product with the absorbent main body is cut by the cutter device 98 to obtain the product 10.
  • the opening process can be performed by a line having the form shown in FIG. 23, for example.
  • the toe 52Y is pulled out from the bail 52X and is gradually expanded through the widening device 120, and then passed to the thickening device 110 through the first yuf ° 126A, the second yuf ° 126B, and the third yuf ° 126C.
  • the superabsorbent polymer particles 54 are sprayed and supplied by the superabsorbent polymer particle spraying means 90 on the filament aggregate 52Z. Later sent to Sarah 92.
  • the tow is pulled out from the bale 52X by pulling in with the 1st-up 126A (corresponding to the drive-up roll).
  • the toe 52Y pulled out from the bale 52X is subjected to a change in the angle by the turn part 122 and then a pair of free-up rolls 124 configured to be freely rotatable.
  • the first pull-up 126A is pulled in through the pop-up.
  • the transfer resistance of the free-up roll 124 (determined according to the two-up pressure and the roll's own weight) also functions as a brake that suppresses the pull-in speed of the toe 52Y.
  • the tension becomes stable. This is due to the fact that the rotation of the free rope 124 is generated only by the passage of the tow.
  • the free pressure and free weight of the free-roll 124 may be determined as appropriate. In normal cases, it is preferable that the double pressure is more than OMPa and 5 MPa or less. Book It is preferable to be more than Okg and not more than 10kg. Within this range, tension can be easily stabilized.
  • the tow 52Y pulled out from the bale 52X is between the bale 52X and the free-up roll 124, between the free-up roll 124 and the first-up 126A, and between the first-up 126A and the first.
  • the widening device 120 provided between the 2-p 126B and between the 2-p 126B and the 3-p 126C is widened stepwise to a desired width. At this time, it can also be expanded in the thickness direction.
  • the widening device 120 includes a rectangular tube passage 120A having a predetermined width X through which the tow passes, and a compressed air jet outlet 120B formed on a surface along the width direction on the inner surface of the passage 120A.
  • the tow 52 ⁇ to be introduced is widened to the full width of the passage by the force of compressed air.
  • the height of the passage is set to be equal to or greater than the thickness of the tow 52Y to be introduced, and when it is higher than the thickness of the tow 52Y, the tow 52Y is also expanded in the thickness direction.
  • the spout 120B is line-symmetric with respect to the center in the width direction of the passage 120A, and has a dogleg shape that is located downstream in the toe passage direction toward the center in the width direction of the passage 120A. (Or V-shaped) It is a slit.
  • the tow 52Y When the tow enters the passage 120A in such a state that the slit 120B force is also ejected, the tow 52Y receives the force of the compressed air in a well-balanced manner even if the approach position is shifted in the center force in the width direction. Thus, it escapes to the center in the width direction (in the direction of the arrow in FIG. 22), and the tow 52Y is naturally guided to the center in the width direction of the passage 120A. In other words, the introduction position of the toe 52Y can be centered using compressed air for widening.
  • the widening device 120 having such a centering function exhibits not only centering in widening but also a function of correcting the transfer position.
  • the shape of the slit is a square shape. It is not limited to the shape of the passage, and is formed in a curved shape, an arc shape, etc. as long as it satisfies the condition of being line-symmetrical with respect to the center in the width direction of the passage 120A and being located downstream in the toe passage direction toward the center in the width direction of the passage 120A You can also.
  • tension is applied between the 1st-up 126A and the 2nd-up 126B so as to apply tension to the toe 52Y.
  • the peripheral speed of each -up roll is set so as to be relaxed between As a result, tension is applied to the tow 52Y between the first-up 126A and the second-up 126B, so that the entanglement between the filaments is forcibly removed to some extent and the separation of the filaments is promoted.
  • the tow 52Y is widened by the widening device 120 along with the separation, so that the tow 52Y can be further uniformly widened.
  • the toe 52Y is widened by the widening device 120 while the tow 52Y is relaxed between the 2-up 126B and the 3-up 126C. It becomes.
  • one roller of the second 2-p 126B is formed with a number of grooves that are continuous in the circumferential direction with small intervals in the longitudinal direction.
  • This groove has the function of promoting tow unraveling by allowing the filament to enter a large number of grooves.
  • the holding angle of the toe 52Y (the rotation direction angle of the toe contact portion) in one of the grooved rollers of the 2-up 126B is increased, and the toe 52Y and the grooved roller are increased. It is also a preferable form to increase the contact area.
  • the angle between the tow 52Y on the upstream side of the 2-p 126B and the tow 52Y on the downstream side, that is, the direction change angle by the grooved roller is less than 180 degrees, especially acute angle (smaller than 90 degrees) It is preferable to constitute so that.
  • the first-up 126A, the second-up 126B, and the third-up 126C may have different combinations of roll diameters.
  • the force applied to the tow 5 2Y between the rolls and the contact resistance between the roll and the toe 52Y may cause unevenness in the toe width direction.
  • the thickening device 110 has a structure similar to that disclosed in, for example, Japanese Patent Laid-Open No. 59-500422 (WO 83/03267), and schematically shows an inlet 110A and an outlet 110B as shown in FIG.
  • a bench lily part 110b is formed between and the inlet side of the pressurized air 110a.
  • the bench lily part 110b has an air exhaust hole 110c. In plan view, it is almost rectangular and flat in the direction penetrating the page of FIG.
  • the SAP supply device 90 it is preferable to disperse the superabsorbent polymer particles substantially in the entire thickness direction with respect to the filament aggregate 52Z.
  • a superabsorbent polymer particle spraying means 90 not only a dropping force due to its own weight but also an accelerating force is desirable.
  • An example of this is shown in FIG. That is, a rotating drum 90b having a projection hole 90d in a casing 90a having an opening in the lower part is configured to rotate in the moving direction of the web (counterclockwise in FIG. 27), and a shatter drum 90c is provided therein. It is what was done.
  • the projection unit 90A having these elements is connected to a hopper that stores superabsorbent polymer particles, and the superabsorbent polymer particles 54 having a hopper force are configured to be supplied into the rotating drum 90b! RU
  • the position of the opening of the shatter drum 9 Oc is adjusted in advance with respect to the opening position of the casing 90a.
  • the fully opened state is shown.
  • the projection hole 90d of the rotating drum 90b is divided into four groups in the circumferential direction as shown in the drawing as a group divided in the circumferential direction. Therefore, in the process shown in the drawing, four sheets of disposable diapers are rotated. The superabsorbent polymer particles are sprayed and projected on the surface.
  • the superabsorbent polymer particles 54 may be continuously dispersed and projected onto the aggregate of the filaments 52, but the absorbent element 50 is divided in the line direction by the cutter device 94, and the individual absorbent elements 50 and The blades of the cutter device 94 can be shortened due to the presence of superabsorbent polymer particles 54 It will wear out. Therefore, it is desirable to disperse and project only the zone Z intermittently, as shown in FIG. 27, instead of continuously dispersing and projecting the superabsorbent polymer particles 54.
  • the projection hole 90d of the rotary drum 90b is divided into four groups in the circumferential direction as shown in FIG.
  • the polymer particles 54 are intermittently scattered and projected only in the zone Z.
  • the zone Z and Z can be divided by the cutter device 94, and the blade wear of the cutter device 94 can be suppressed.
  • the amount of the superabsorbent polymer particles sprayed can be adjusted mainly by adjusting the opening size of the shatter drum 90c relative to the opening position of the casing 90a, and the size of the projection hole 90d. In addition, the position of the opening is preferably followed.
  • the dispersion pattern of the superabsorbent polymer particles can be adjusted by the arrangement of the divided projection holes 90d.
  • the superabsorbent polymer particles 54 can be substantially scattered on the aggregate of filaments by spraying and projecting the superabsorbent polymer particles 54 on the aggregate of filaments 52 together with pressurized air. It is also possible to disperse in the entire thickness direction. However, the superabsorbent polymer particles sprayed onto the aggregate of filaments 52 may be scattered by the pressure air and scattered outside the specified area.
  • the superabsorbent polymer particles 54 dispersed on the filament aggregate may be sucked from below the filament aggregate together with or instead of the SAP supply device 90.
  • SAP supply device 90 that applies the centrifugal component force described above
  • a general-purpose SAP supply device that simply drops the superabsorbent polymer particles by its own weight may be used.
  • FIG. 28 shows an example of a pants-type disposable diaper.
  • This pants-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent main body 20, and the absorbent main body 20 is fixed to the exterior sheet 12.
  • Absorbent body 20 is soft urine It is the part that receives and absorbs fluid such as feces (menstrual blood in the case of sanitary napkins described later).
  • the exterior sheet 12 is a part for attaching to the wearer.
  • the exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which the wearer's leg is inserted.
  • Absorbent body 20 can take any shape
  • the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed in place, and both sides of the front body 12F and the back body 12B of the exterior sheet 12
  • the joining region 12A is joined by heat fusion or the like.
  • a pants-type disposable diaper having a structure shown in FIG. 28 and having a waist opening WO and a pair of redder openings LO is obtained.
  • the intermediate width in the longitudinal direction of the absorbent main body 20 shown in the figure (that is, the vertical direction in Fig. 29, which is also the front-rear direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. It has been. This width relationship may be reversed or the same width.
  • the exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and the outer sheet 12 is desirably fitted to the wearer by its contraction force.
  • the elastic elastic member thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers.
  • the rubber threads 12C, 12C,... are continuously provided in the width direction in the waist region W, provided only on both sides in the waist region U, and provided in the crotch region L. Absent.
  • the rubber thread 1 2C, 12C ... is provided in both the waist region W and the lower waist region U, so that even if the elastic force of the thread rubber 12C itself is weak, the wearer also in the lower waist region U as a whole The product fits the wearer well.
  • the absorbent main body 20 includes a top sheet 30 having a force such as a non-woven fabric that allows liquid to pass therethrough, an intermediate sheet (second sheet) 40, and an absorbent element 50. Further, a liquid-impermeable sheet 70 having a force such as a plastic sheet is provided on the back side of the absorber 56. An exterior sheet 12 is provided on the back side of the liquid-impermeable sheet 70. In addition, it is equipped with barriers 60, 60 on both sides. [0281] (Top sheet)
  • the top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, polyolefins such as polyethylene and polypropylene, synthetic fibers such as polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used. It can be illustrated. Further, the non-woven fabric may be manufactured by any kind of cage.
  • processing method examples include known methods such as a spun lace method, a spun bond method, a thermal bond method, a melt blown method, a needle punch method, and the like.
  • spun lace method is a preferable processing method for obtaining flexibility and drape
  • thermal bond method is for obtaining bulkiness and softness.
  • the top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.
  • an intermediate sheet 40 called “second sheet” can be provided.
  • This intermediate sheet quickly transfers the liquid to the absorber to enhance the absorption performance by the absorber, preventing the “reversal” phenomenon of the absorbed liquid from the absorber by force and always drying the top sheet 30 It can be made into the state which carried out.
  • Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spun lace, pulp non-woven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper.
  • an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
  • the intermediate sheet (second sheet) 40 is interposed between the top sheet 30 and the covering sheet 58. As shown in FIG. 32, a configuration without the intermediate sheet (second sheet) 40 can also be used. Further, although not shown, it may be arranged between the covering sheet 58 and the absorber 56. [0286]
  • the intermediate sheet 40 in the form shown in the figure is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width.
  • the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56, or may be within a short or long range centered on the region for receiving the liquid.
  • a typical material for the intermediate sheet 40 is a nonwoven fabric excellent in liquid permeability.
  • the liquid-impermeable sheet 70 is a sheet disposed on the back side of the absorber 56.
  • the material of the liquid-impermeable sheet is not particularly limited.
  • an olefin-based resin such as polyethylene or polypropylene
  • a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, or a waterproof film is interposed for example, a non-woven fabric that is substantially impervious to liquid (in this case, a waterproof film and a non-woven fabric constitute a liquid-impermeable sheet) can be used.
  • a material having liquid-impervious and moisture-permeable properties which has been preferred in recent years from the viewpoint of preventing stuffiness, can also be used.
  • an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, the sheet is formed, and then stretched in a uniaxial or biaxial direction.
  • an olefin-based resin such as polyethylene or polypropylene
  • the liquid-impermeable sheet 70 can be wound around both sides of the absorber 56 to extend to the use surface side (not shown).
  • side leakage is prevented by interposing the second liquid-impermeable sheet 72 between the double barrier sheets 64 forming the NORY cuff 60.
  • the second liquid impervious sheet 72 extends until the barrier cuff 60 is erected! /, So that the liquid diffused laterally through the top sheet 30 and the barrier one-piece hull 60, There are ⁇ lj points to prevent side leakage of loose stool between 60.
  • Barrier force bars 60, 60 provided on both sides of the product are provided to prevent urine and soft stool that move laterally along the top sheet 30 and prevent side leakage.
  • the substantial standing height of the pariya cuff does not decrease, the amount of damming is reduced, and the followability to the body surface is improved.
  • Norriya cuffs 60 and 60 since it is difficult for the decrease to occur.
  • Noriya cuffs are an optional element and can be omitted.
  • the illustrated noir cuff 60 is formed by duplicating a water-repellent nonwoven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Formed like!
  • the side cuff of the liquid-impermeable sheet 70 is inserted between the double nonwoven fabric sheets, and the noir cuff protruding from the surface side 60 It extends to the middle.
  • the force of the barrier first force hose 60 itself can be designed as appropriate.
  • an elastic elastic member for example, rubber thread 62 is stretched at the tip and middle of the protrusion of the barrier force hose 60. It is fixed underneath, and in the state of use, the Norriya cuff 60 stands up due to its contraction force.
  • the base part of the noir cuff 60 is arranged so that the middle thread rubber 62 is positioned closer to the center than the front thread rubbers 62, 62 and fixed to the front and rear ends of the top sheet 30.
  • the side rises obliquely toward the center side, and the tip portion rises obliquely outward from the intermediate portion.
  • the barrier one-piece hoop 60 shown in FIG. Although it is fixed in a stretched state along the front-rear direction, in the present invention, since the increase in rigidity of the crotch both sides 56S is suppressed even after absorption, the elasticity of the rubber thread 63 is sufficiently exerted, and the leg circumference In addition, good fit can be obtained.
  • the embossed recess E can be formed in both the top sheet 30 and the intermediate sheet 40, or the top sheet 30 A concave portion by embossing can be formed (not shown) so as to reach part or substantially the whole thickness direction of the absorber 56 from the surface side.
  • the intermediate sheet 40 has a basis weight of 8 to 40gZm 2 , a thickness of 0.2 to 1.5mm, and a top sheet 30.
  • the embossed recess may be formed only on the intermediate sheet 40 without forming a recess in the top sheet 30, and the recess may be formed in the top sheet 30 and the intermediate sheet 40.
  • a concave portion by embossing may be formed only in 56, or a concave portion by embossing may be formed only in the absorbent body 58 without forming concave portions in the top sheet 30, the intermediate sheet 40 and the covering sheet 58.
  • the recess E has an effect of inducing and diffusing the liquid in the extending direction. Therefore, when the recess E is substantially continuous in the shape of a groove (including the case where a plurality of recesses are arranged in a row at intervals to form a single groove), the liquid is allowed to reach the surface side layer before reaching the absorber. It spreads through the concave part E, and a wider part of the absorber can be used for absorption. Therefore, the absorbent capacity of the entire product is increased, and the absorbent article is less likely to leak from the side or return due to insufficient absorbent capacity.
  • the absorber 56 made of tow tends to have lower rigidity than the conventional pulp material, but it is preferable to form a concave portion by embossing in the absorber 56 because the rigidity can be increased.
  • the embossing force is integrated so as to reach the absorber 56 from the back surface side of the holding sheet 80, the covering sheet 58, the liquid-impermeable sheet 70 or the exterior sheet 12.
  • Such a recess on the back surface side is preferably formed together with the recess E on the front surface side, but it is also possible to form only the recess on the back surface side without forming the recess E on the front surface side.
  • the shape of the recesses may be common to the front and back sides, or the front and back sides may be different.
  • the concave portion formed by embossing has the effect of inducing and diffusing liquid in the extending direction. It also has the effect of increasing rigidity. Therefore, it is desirable that the shape of the embossed recess is determined in consideration of these effects.
  • the recesses are substantially continuous in the shape of a groove (including the case where a plurality of recesses are arranged in a row and form a single groove), and the plurality of recesses are in the form of dots at intervals. It may be arranged.
  • planar pattern groove-shaped or dot-shaped concave portions are arranged in the longitudinal direction, the width direction, a lattice shape combining these, a zigzag shape (zigzag shape) reciprocating in the width direction, or irregularly arranged.
  • zigzag shape zigzag shape reciprocating in the width direction
  • irregularly arranged can take form, etc. wear.
  • appropriate forms such as a pin shape, a Mt. Fuji shape, and a bellows shape can be adopted.
  • the absorbent element 50 is composed of an absorbent body 56 having an aggregate of filaments 52, 52, and a superabsorbent polymer single particle 54, 54, which are opened tow, and at least the back and side surfaces of the absorbent body 56. And a covering sheet 58 to be wrapped. Further, a holding sheet 80 is provided between the absorbent body 56 and the rear surface side portion (lower portion) of the covering sheet 58.
  • the absorber 56 has an aggregate of filaments 52, 52.
  • the aggregate of the filaments 52, 52 Is obtained by opening a tow that is a bundle of substantially continuous filaments.
  • tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polybutyrate, etc.). Force that can be produced In particular, cellulose ester and cellulose are preferred.
  • cellulose cellulose derived from plants such as cotton, linter and wood pulp, butterfly cellulose, etc. can be used.
  • Regenerated cellulose which may be regenerated cellulose such as rayon, is a spun fiber. Moyo.
  • cellulose esters examples include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more.
  • the viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800.
  • the average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
  • the average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3. , Preferably 1 to 2.15, more preferably about 1.1 to 2.0 be able to.
  • the average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
  • an organic acid ester for example, an ester with an organic acid having about 2 to 4 carbon atoms
  • cellulose acetate is suitable.
  • the acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
  • a particularly preferred cellulose ester is cellulose diacetate.
  • the tow constituting fiber may contain various additives such as a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver and the like.
  • the fineness of the tow constituting fiber is, for example, 1 to 16 dex, preferably 1 to: LOdex, and more preferably 1 to 5 dex.
  • the tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber.
  • the crimping degree of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a highly integrated tow can be easily produced by entanglement between the fibers.
  • the cross-sectional shape of the toe-constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. May be.
  • the tow-constituting fiber is composed of, for example, 3,000 to 1,000,000 tow (fiber bundle) formed by bundling single fibers of about 5,000 to 1,000,000. Can be used in form.
  • the fiber bundle is preferably formed by bundling about 3,000 to 1,000,000 continuous fibers.
  • the tow is weak in entanglement between fibers! /, So a binder having an action of adhering or fusing the contact portion of the fiber can be used mainly for the purpose of maintaining the shape.
  • the noda include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various types of resin adhesives, particularly thermoplastic resins. Fats can be used.
  • Thermoplastic resin used as a binder exhibits adhesive strength by melting and solidifying. It is a rosin and includes water-insoluble or poorly water-soluble rosin and water-soluble rosin. Water-insoluble or poorly water-soluble rosin and water-soluble rosin can be used in combination as necessary.
  • water-insoluble or poorly water-soluble resins include polyethylene or polypropylene, ethylene propylene copolymer, ethylene olefin homopolymer or copolymer such as ethylene acetate butyl copolymer, poly (butyl acetate), poly (methacrylic acid).
  • Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene ⁇ , petroleum ⁇ ), such as hydrogen added hydrocarbon ⁇ can be used. These thermoplastic rosins can be used singly or in combination.
  • the water-soluble rosin has various water-soluble polymers such as polybulal alcohol, polypyrrole pyrrolidone, polybull ether, bulll monomer, and carboxyl group, sulfonic acid group or a salt thereof.
  • Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used.
  • These water-soluble coagulants can be used alone or in combination of two or more.
  • thermoplastic resin Various additives such as stabilizers such as antioxidants and UV absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.
  • binder components that inhibit penetration of superabsorbent polymer particles should be avoided whenever possible. It is best not to use binder components that inhibit the entry of superabsorbent polymer particles.
  • the tow can be produced by a known method and will not be described in detail.
  • Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries.
  • Cellulose diacetate tow bale has a density of about 0.5 gZcm 3 and a total weight of 400-600 kg.
  • the tow is peeled off and spread into a wide band so as to have a desired size and bulk.
  • the opening width of the tow is arbitrary, and may be, for example, a width of 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the product absorber.
  • the density of the absorbent can be adjusted by adjusting the degree of tow opening.
  • Examples of the method for opening the tow include a method in which the tow is spread over a plurality of opening rolls and the tow is gradually expanded as the tow progresses, and the tow tension (elongation) is used.
  • a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.
  • Absorber 56 has superabsorbent polymer particles 54, 54.
  • the superabsorbent polymer particle 54 is meant to include “powder” in addition to “particle”.
  • particle diameter of the superabsorbent polymer particles 54 those used for this type of absorbent article can be used as they are, and those of 100 to 1000 / ⁇ ⁇ , particularly 150 to 400 / ⁇ ⁇ are desirable. If the particle size is too small, it is not preferable because it is easy to move in the absorber 56 and the scattering loss in the production line increases. Also, if the particle size is too large, the harsh texture becomes noticeable and the product value may be reduced.
  • superabsorbent polymer particles those having a force water absorption amount of 60 gZg or more that can be used without particular limitation are suitable.
  • Superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles such as starch acrylic acid (salt) daraf copolymer, starch-acrylonitrile copolymer ken-yi, and sodium carboxymethyl cellulose. Cross-linked products and acrylic acid (salt) polymers can be used.
  • shape of the superabsorbent polymer particles a force in which a commonly used granular material is suitable may be used in other shapes.
  • the superabsorbent polymer particles 54 those having a water absorption speed of 0 second or less are preferably used. When the water absorption speed exceeds 40 seconds, the liquid supplied into the absorbent body is likely to cause a so-called reversal that returns to the outside of the absorbent body.
  • the superabsorbent polymer particles 54 those having a gel strength of lOOOPa or more are preferably used. Thereby, even if it is a case where it is set as a bulky absorber by using tow
  • the basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the amount of absorption required for the use of the absorber. Therefore, although it cannot be said unconditionally, it can be 50 to 350 gZm 2 on the average of the absorbent element 50 as a whole.
  • the basis weight of the polymer 50gZm 2 By making the basis weight of the polymer 50gZm 2 or more, it is possible to prevent the thinning and light weight effect that is obtained by adopting the aggregate of filaments that are also tuka by the absorption capacity of the polymer. it can. 3 Above 50 gZm 2 , the excess of superabsorbent polymer particles that saturate the effect will give a crisp feel.
  • the size of the absorber 56 is preferably a plane projection area force of OOcm 2 or more and a thickness of 1 to 10 mm, particularly 1 to 5 mm.
  • the size of the absorber is within this range, it is extremely advantageous for improving the resilience without increasing the weight, thickness and cost.
  • the weight of the absorber is 25 g or less, particularly 10 to 20 g.
  • Absorber weight force S Within this range, the advantage of not using a special member becomes particularly significant.
  • the compression resilience RC of the absorber 56 is preferably 40 to 60%, particularly 50 to 60%. Thereby, sufficient restoring property can be exhibited with the absorber itself.
  • the compression energy WC of the absorber 56 is 4.0 to: LO. Ogf 'cmZcm 2 because it can be compacted to the same level or higher when packaging.
  • These compression characteristics can be adjusted by adjusting the fiber density of the aggregate of filaments by opening, etc., selecting the fiber material, selecting the type of binder such as a plasticizer, or adjusting the degree of processing, or a combination of these. Etc. can be adjusted.
  • the compression energy is the amount of energy consumed when pressing the center of a test piece (holding sheet) cut to a length of 200mm and a width of 50mm up to 50g.
  • This compression energy can be measured by a handy compression tester (KES-G5, manufactured by Kato Tech).
  • the measurement conditions with this tester are: SENS: 2, force gauge type: lkg, SPEED RANGE: STD, DEF sensitivity: 20, pressurization area: 2cm 2 Included Interval: 0. 1 (standard), STROKE SET: 5. 0, the upper limit load: a 50gfZcm 2.
  • compression resilience is a parameter that represents the recoverability when a fiber is compressed. Therefore, if the recoverability is good, the compression resilience increases.
  • This compression Les Jiriensu can by handy compression tester (KE s-G5, manufactured by Kato Tech Co., Ltd.), is measured. The measurement conditions for this tester are the same as for the compression energy.
  • tissue paper particularly crepe paper, non-woven fabric, non-woven fabric of polylamy, a sheet with small holes, etc.
  • a sheet with small holes, etc. tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylamy, a sheet with small holes, etc.
  • the sheet does not allow the superabsorbent polymer particles to be extracted.
  • non-woven fabric instead of crepe paper, hydrophilic MSMS (spunbond Z meltblown Z meltblown Z spunbond) non-woven fabric is particularly suitable, and polypropylene, polyethylene zpolypropylene, etc. can be used as the material.
  • the basis weight is preferably 8 to 20 g / m 2 , particularly 10 to 15 g / m 2 .
  • this covering sheet 58 has a force in a form of wrapping the aggregate of the filaments 52, 52 ⁇ and the entire layer of the superabsorbent polymer particles 54, 54 ⁇
  • this covering sheet 58 has a force in a form of wrapping the aggregate of the filaments 52, 52 ⁇ and the entire layer of the superabsorbent polymer particles 54, 54 ⁇
  • the layer may be covered.
  • the upper and side surfaces of the absorbent body 56 are covered with a crepe paper nonwoven fabric
  • the lower surface is covered with a liquid-impermeable sheet such as polyethylene
  • the upper surface of the absorbent body 56 is covered with a crepe paper nonwoven fabric.
  • the side surface and the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a constituent element of the enveloping sheet).
  • the aggregates of the filaments 52, 52... And the superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed
  • the main absorbent portion 56C which is a portion other than the both side portions 56S, 56S of the crotch portion, has the superabsorbent polymer particles 54, 54, and the crotch portion is compared with the main absorbent portion 56C.
  • Both sides 56S and 56S are considered to be parts with a low basis weight of the superabsorbent polymer particles!
  • the crotch part, the front part and the rear part of the crotch part can be, for example, the middle, front side, and rear side when the absorbent body 56 is divided into three in the front-rear direction.
  • Crotch both sides 56S, one side May be a portion having a width of 5 to 40% of the width of the absorber 56, for example.
  • the dispersion density of the superabsorbent polymer particles 54 is different between the main absorbent portion 56C and the both side portions 56S, 56S of the crotch portion.
  • both side portions 56S and 56S of the crotch portion are also referred to as low density portions.
  • the positions, dimensions, and shapes of the low-density portions 56S, 56S may be appropriately determined within the scope of the present invention.
  • the position in the front-rear direction is preferably a position straddling the center line in the front-rear direction of the article. It is preferable that the length m is 50 to 300 mm and the width n is 10 to 100 mm.
  • the shape of the low-density portions 56S, 56S is preferably a portion surrounded by a line extending from the front-rear direction center side to the width-direction center side rather than the front-rear direction ends, for example, as shown in FIG. Such a portion surrounded by a substantially arc-shaped curve along the circumference of the leg, or a substantially trapezoidal portion as shown in FIG.
  • the basis weight of the superabsorbent polymer particles 54 in the low density portion 56S can be determined as appropriate.
  • the basis weight of the aggregate of the filaments 52 is set to 30 to 300 gZm 2 and the basis weight of the superabsorbent polymer particles 54 is determined.
  • the average of the entire absorbent element 50 is 50 to 350 gZm 2 , it is preferably 100 g / m 2 or less.
  • the low density portion 56S has substantially no structure, for example, by not arranging the superabsorbent polymer particles 54 at the time of manufacture.
  • the superabsorbent polymer particles 54 may be non-fixed, but in that case, depending on the manufacture, transportation, and use of the product, the superabsorbency of other parts with respect to both sides 56S, 56S of the crotch The polymer single particle 54 may move and the effect may be diminished. Therefore, it is preferable that a part or all of the superabsorbent polymer particles 54 be bonded and fixed to the assembly of filaments 52 and the covering sheet 58.
  • FIG. 45 assumes the case where the superabsorbent polymer particles 54 are bonded to the aggregate of filaments 52 via the adhesive HM.
  • An adhesive for fixing the superabsorbent polymer particles 54 A hot melt adhesive can be suitably used as the HM.
  • the coating amount for which curtain coating is preferred is 2 to 15 g / m 2 , and the preferred coating region is preferably slightly wider than the main absorbent portion.
  • the distribution of the superabsorbent polymer particles 54 in the thickness direction of the absorber 56 is not particularly limited, and may be provided not on the filament 52 assembly but on the back surface side of the filament 52 assembly. Force As shown in FIG. 30, it is desirable that the superabsorbent polymer particles 54 are dispersed substantially throughout the thickness direction of the absorbent body 56. This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.
  • “distributed in the entire thickness direction” means “uniformly distributed” in the upper, lower, and / or middle portions of the aggregate of the filaments 52 in addition to the form “uniformly” distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle parts.
  • a holding sheet 80 for holding the superabsorbent polymer particles 54 is interposed on the back surface side or the skin surface side of the absorber 56.
  • the holding sheet 80 passes through the side surface of the absorber 56 and is rolled up to the upper surface of the absorber 56 as shown in Fig. 33. You can extend it. Not shown !, but the holding sheet 80 is covered with the covering sheet 58 on the surface side and the absorbent body 56 on the skin side. You may arrange
  • the superabsorbent polymer particles 54 are unevenly distributed between the holding sheet 80 and the aggregate of the filaments 52, and thus the superabsorbent polymer particles are highly absorbable.
  • a structure in which the polymer particles 54 are fixed to at least one of the holding sheet 80 and the filament aggregate by the adhesive HM can be given.
  • the material of the holding sheet 80 is not particularly limited as long as it has an ability to hold absorbent polymer particles.
  • non-woven fabric, crimped pulp, low-absorbency cotton fiber for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with water repellent or water repellant, etc.
  • low-absorbency cotton fiber for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with water repellent or water repellant, etc.
  • polyethylene fiber polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber, etc.
  • a resin film or paper can also be used.
  • the holding sheet 80 When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy based on the KES test of 0.01 to: LO. 00 gfcm / cm 2 , preferably 0.01 to: L OOgfcm / cm 2 And a compression resilience of 10 to 100%, preferably 70 to 100%.
  • a hot-melt adhesive or the like is applied on the holding sheet 80 in advance, and the superabsorbent polymer particles 54 are placed on the holding sheet. Adhesion to 80 is preferred.
  • the holding ability can be improved by making the upper surface (the surface facing the use surface side) of the holding sheet 80 rough or fluffed.
  • Examples of the roughening or fluffing method for this purpose include marble force and brushing cache.
  • a large number of holding holes 81 are formed in the holding sheet 80 in the form of dots.
  • the holding holes 81 may be regularly arranged or irregularly arranged.
  • the holding hole 81 may be a hollow hole that does not penetrate the sheet 80 or may be a through hole. With such holding holes 81, superabsorbent polymer particles 54 are held. By being trapped in the hole 81, the movement is suppressed.
  • the size and number of the holding holes 81 can be appropriately determined.
  • the opening area of the holding holes 81 is preferably 3 to 25 mm 2 and the number per unit area is preferably 5000 to 50000 Zm 2 . Is preferred.
  • the main absorbing portion 56C is applied to both sides of the crotch portion 56S, 56S by arranging the holding sheet with the holding holes formed entirely on the portion that overlaps the main absorbing portion 56C.
  • the movement of the superabsorbent polymer particles 54 can be efficiently suppressed. The same holds true if the holding hole is formed only in the portion of the holding sheet 80 that overlaps the main absorbent portion 56C.
  • the adhesive HM for fixing the superabsorbent polymer particles 54 is preferably applied only to the main absorbent portion 52C. While suppressing the movement of the superabsorbent polymer particles 54 by adhesion, it is difficult to impair the fit in the crotch region. In this case, as long as the adhesive HM is applied only to the main absorbent portion 52C, it may be applied to substantially the entire main absorbent portion 52C or to a part thereof.
  • the constituent members of the absorbent main body 20 are fixed to each other by a solid such as a hot melt adhesive, a bead, a spiral, or a summit coating.
  • Fig. 36 shows Fig. 35
  • the tape-type disposable diaper 10A has fastening pieces attached to both end portions on the back side of the diaper, has a hook element on a fastening surface of the fastening piece, and constitutes the back surface of the diaper.
  • a diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted.
  • the absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70.
  • the absorbent body 56 is entirely wrapped with a covering sheet 58 made of tissue paper, and has a rectangular shape in plan view.
  • a holding sheet 80 is provided between the absorbent body 56 and the covering sheet 58.
  • an intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56.
  • the liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.
  • the top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.
  • barrier one-force hulls 60A projecting to the use surface side are formed on both sides of the diaper. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is a fasting piece with a hook-and-loop fastener.
  • the inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and this fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive.
  • the outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.
  • the starting end of the inner surface of the NORY sheet 64 attached to the liquid-impermeable sheet 70 forms the upright end of the NORY cuff 60A.
  • the inside of the standing end is the product body It is a free part that is not fixed to the thread, and this free part comes to stand by the contraction force of the rubber thread 62.
  • the fastening piece 130 by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.
  • the base of a fasting base material such as plastic, polylaminated nonwoven fabric, or paper is joined to the backsheet 12A by, for example, an adhesive, and the hooking piece 130 has a hook element 130A on the tip side.
  • the hook element 130A is bonded to the fastening substrate with an adhesive.
  • the hook element 130A has a large number of engaging pieces on the outer surface side thereof.
  • a temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body.
  • the fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.
  • a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A, which serves as a guide for fixing the hook element 130A of the fastening piece 130.
  • the target print with the design is made and made visible through the back sheet 12A from the outside.
  • the diaper When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. To do.
  • the space surrounded by the standing part forms a confined space for urine or soft stool.
  • the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented.
  • side leakage is prevented by a stop function by the flat contact part.
  • the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable).
  • the top sheet of the present invention may be made to repel liquid by silicon treatment or the like.
  • the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.
  • a sheet of 2 o or more is preferable. As a result, air permeability is exhibited at the side portion in the width direction of the product, and the wearer's stuffiness can be prevented.
  • FIG. 37 and FIG. 38 shows an example of manufacturing equipment for the pants-type disposable diaper shown in FIG. 28, FIG. 29 and FIG.
  • the covering sheet 58 is supplied to the line from the upstream side, and then the holding sheet 80 is supplied.
  • FIG. 38 shows an adhesive applicator 104 for this purpose.
  • an assembly of filaments 52 2Z formed by opening the tow (details of the opening process will be described later) is also supplied with an upward force.
  • Absorbent polymer particles 54 are sprayed and supplied.
  • the wrapping sheet 58 is wrapped by passing the sailor 92, and the absorbent element 50 is obtained.
  • it is divided in the line direction by the cutter device 94 to form individual absorbent elements 50.
  • the intermediate sheet (second sheet) 40 since the intermediate sheet (second sheet) 40 has a structure shorter than the entire length of the absorbent element 50 in the embodiment, it is supplied intermittently from above.
  • the components of the NORY cuff 60 and the top sheet 30 force are supplied from above and the liquid-impermeable sheet 70 is supplied from below.
  • the supply line of the NORY sheet 64 constituting the NORY cuff 60 the rubber thread 62 is stretched between the two non-woven fabrics and the second liquid impermeable sheet 72 is fixed in advance by a device (not shown). In this state, it is supplied to the main line together with the top sheet 30.
  • the components of the noir cuff 60 supplied to the main line, the top sheet 30 and the liquid-impermeable sheet 70 are arranged in the shape shown in FIG. Folded by LA 96.
  • a rectangular absorbent main body 20 having a longitudinal direction along the line is obtained by cutting with the cutter device 98.
  • the obtained absorbent main body 20 is turned 90 degrees by the turning device 100 so that the longitudinal direction of the absorbent main body 20 is orthogonal to the line.
  • the thread rubber 12C flows in advance between two non-woven sheets (not shown in FIG. 37), and the leg periphery is formed.
  • it is cut into an oval shape by a cutter (not shown), and when the combination station 102 is reached, the absorbent main body 20 that has been turned around is installed between the cut-out portions, and hot melt adhesive, etc. And fixed to the outer sheet 12. Thereafter, it is folded up and down with the horizontal line in FIG. 37 as a boundary, and the joining regions 12A on both sides of the front body 12F and the back body 12B of the exterior sheet 12 are joined by heat sealing or the like. Thereafter, the product is divided in the line direction (the dividing means are not shown) to obtain individual products.
  • the fiber opening step can be performed, for example, by a line having the form shown in FIG.
  • the toe 52Y is pulled out from the bail 52X and is gradually expanded through the widening device 120, and then passed to the thickening device 110 through the first yuf ° 126A, the second yuf ° 126B, and the third yuf ° 126C.
  • the superabsorbent polymer particles 54 are sprayed and supplied by the superabsorbent polymer particle spraying means 90 on the filament aggregate 52Z. Later sent to Sarah 92.
  • the tow is pulled out from the bale 52X by pulling in with the 1st-up 126A (corresponding to the drive-up roll).
  • the toe 52Y pulled out from the bail 52X is changed in angle by the turn part 122, and then is rotated through a free-up roll 124 having a pair of free-up roll forces configured to be freely rotatable.
  • 1st-p 126A is designed to be pulled in.
  • the force applied by the transfer resistance of the free-up roll 124 (determined according to the Ep pressure and the roll's own weight) also functions as a brake that suppresses the pull-in speed of the toe 52Y, and the tension after the free-up roll 124 is stable. To come. This is due to the fact that the rotation of the free-rolls 1 24 occurs only when the tow passes! /.
  • the free-up roll 124's -up pressure and its own weight may be determined as appropriate, but in normal cases, it is preferable that the 2-up pressure is over OMPa and 5 MPa or less. It is preferable that the amount be more than Okg and less than 10kg. Within this range, tension can be easily stabilized.
  • the tow 52Y drawn from the bale 52X is placed between the bale 52X and the free-up roll 124, between the free-up roll 124 and the first-up 126A, and between the first-up 126A and the first.
  • the widening device 120 provided between the 2-p 126B and between the 2-p 126B and the 3-p 126C is widened stepwise to a desired width. At this time, it can also be expanded in the thickness direction.
  • FIG. 39 and FIG. 40 show the widening device 120, and a rectangular tube passage 120A having a predetermined width X through which the tow passes, and compressed air formed on a surface along the width direction on the inner surface of the passage 120A.
  • the tow 52Y introduced into the passage 120A is widened to the full width of the passage by the force of compressed air.
  • the height of the passage is equal to or greater than the thickness of the tow 52Y to be introduced, and when it is higher than the thickness of the tow 52Y, the tow 52Y is also expanded in the thickness direction.
  • the spout 120B is line-symmetric with respect to the center in the width direction of the passage 120A, and has a dogleg shape that is located downstream in the toe passage direction toward the center in the width direction of the passage 120A. (Or V-shaped) It is a slit.
  • the tow 52Y When the tow enters the passage 120A in such a state that the slit 120B force is also ejected, the tow 52Y receives the force of the compressed air in a well-balanced manner even if the approach position is shifted in the center force in the width direction. Thus, it escapes to the center in the width direction (in the direction of the arrow in FIG. 40) and the toe 52Y is naturally guided to the center in the width direction of the passage 120A. In other words, the introduction position of the toe 52Y can be centered using compressed air for widening.
  • the widening device 120 having such a centering function is not only capable of centering in widening, but also has a function of correcting the transfer position. Also demonstrates.
  • the shape of the slit is not limited to the square shape, and is symmetrical with respect to the center in the width direction of the passage 120A and toward the center in the width direction of the passage 120A. As long as the conditions located downstream in the toe passing direction are satisfied, it may be formed in a curved shape, an arc shape or the like.
  • tension is applied between the 1st-up 126A and the 2nd-up 126B so as to apply tension to the toe 52Y.
  • the peripheral speed of each -up roll is set so as to be relaxed between As a result, tension is applied to the tow 52Y between the first-up 126A and the second-up 126B, so that the entanglement between the filaments is forcibly removed to some extent and the separation of the filaments is promoted.
  • the tow 52Y is widened by the widening device 120 along with the separation, so that the tow 52Y can be further uniformly widened.
  • the toe 52Y is widened by the widening device 120 while the tow 52Y is relaxed between the 2-up 126B and the 3-up 126C. It becomes.
  • one roller of the second 2-p 126B is formed with a large number of continuous grooves in the circumferential direction at small intervals in the longitudinal direction.
  • This groove has the function of promoting tow unraveling by allowing the filament to enter a large number of grooves.
  • the holding angle of the toe 52Y (the rotation direction angle of the toe contact portion) in one of the grooved rollers of the 2-up 126B is increased, and the toe 52Y and the grooved roller are increased. It is also a preferable form to increase the contact area.
  • the angle between the tow 52Y on the upstream side of the 2-p 126B and the tow 52Y on the downstream side, that is, the direction change angle by the grooved roller is less than 180 degrees, especially acute angle (smaller than 90 degrees) It is preferable to constitute so that.
  • first-up 126A, the second-up 126B, and the third-up 126C may have different combinations of roll diameters.
  • the force applied to the tow 5 2Y between the rolls and the contact resistance between the roll and the toe 52Y may cause unevenness in the toe width direction.
  • the thickening device 110 is disclosed in, for example, Japanese Patent Laid-Open No. 59-500422 (WO 83/03267).
  • a bench lily part 110b is formed between the inlet 110A and the outlet 110B, a compressed air inlet 110a is provided on the inlet side, and a bench lily is formed.
  • a part 110b has an air exhaust hole 110c. In plan view, it is almost rectangular and flat in the direction penetrating the page of FIG.
  • the superabsorbent polymer particle spraying means 90 it is preferable to disperse the superabsorbent polymer particles in the entire thickness direction with respect to the filament aggregate.
  • a superabsorbent polymer particle spraying means 90 it is desirable to provide not only a drop force due to the weight of the superabsorbent polymer particles themselves but also an acceleration force.
  • FIG. An example of this is shown in FIG.
  • a rotating drum 90b having a projection hole 90d in a casing 90a having an opening in the lower part is configured to rotate in the moving direction of the web (counterclockwise in FIG. 43), and a shirter drum 90c is placed inside the rotating drum 90b. It is provided.
  • the projection unit 90A including these elements is connected to the hopper 90B (see FIG. 38), and the superabsorbent polymer particle spraying means 90 is configured.
  • the superabsorbent polymer particles 54 from the hopper 90B are configured to be supplied into the rotating drum 90b.
  • the opening position of the shatter drum 9 Oc is adjusted in advance with respect to the opening position of the casing 90a.
  • the projection hole 90d of the rotating drum 90b is divided into four groups in the circumferential direction as shown in the drawing as a group divided in the circumferential direction. Therefore, in the process shown in the drawing, four sheets of disposable diapers are rotated.
  • the superabsorbent polymer particles are sprayed and projected on the surface.
  • the superabsorbent polymer particles 54 may be continuously sprinkled onto the aggregate of filaments 52, but as shown in Fig. 37, the absorbent element 50 is divided in the line direction by the cutter device 94. However, when the individual absorbent elements 50 are used, the presence of the superabsorbent polymer particles 54 The blade of the starter device 94 is worn out in a short time. Therefore, it is desirable that the superabsorbent polymer particles 54 be intermittently dispersed and projected only in the zone Z, as shown in FIG.
  • the projection hole 90d of the rotating drum 90b is formed as a group divided in the circumferential direction, and as shown in the figure, divided into four groups in the circumferential direction.
  • the polymer particles 54 are intermittently scattered and projected only in the zone Z.
  • the zone Z and Z can be divided by the cutter device 94, and the blade wear of the cutter device 94 can be suppressed.
  • the force with which the dispersion density of the superabsorbent polymer particles 54 is different between the main absorbent portion 56C and the both side portions 56S, 56S of the crotch portion. It can be manufactured by adjusting the spraying amount according to the part or adopting a spraying pattern that does not spray on both sides of the crotch.
  • the amount of the superabsorbent polymer particles can be adjusted mainly by adjusting the size of the diameter of the projection hole 90d and adjusting the position of the opening of the shatter drum 90c with respect to the position of the opening of the casing 90a. It can be adjusted by the arrangement of holes 90d.
  • superabsorbent polymer particles 54 can be dispersed and projected onto the aggregate of filaments 52 together with pressurized air, so that the superabsorbent polymer particles are substantially formed on the aggregate of filaments. It is also possible to disperse in the entire thickness direction. However, it is not recommended because the superabsorbent polymer particles sprayed on the aggregate of filaments 52 are scattered by the pressure air and scattered outside the specified area.
  • the superabsorbent polymer particles 54 sprayed on the filament aggregate are sucked from below the filament aggregate. May be.
  • the rotating roll shown in Fig. 37 is replaced with a vacuum roll 106, and the superabsorbent polymer particles are sprayed by applying the centrifugal centrifugal force as described above.
  • Superabsorbent polymer particles 54 can also be sprayed onto the aggregate 52Z of filaments 52 by means of a superabsorbent polymer particle spraying means in which polymer particles are dropped by their own weight. In this case, suction by vacuum roll 106 Since the superabsorbent polymer particles enter the aggregate of the filaments 52 due to attractive force, the superabsorbent polymer particles are dispersed in the lower part of the absorber 56 in the product stage.
  • the amount of the superabsorbent polymer particles 54 to be applied is adjusted according to the region, or a spray pattern that does not spray on both sides of the crotch part is adopted. This is the same as the aforementioned distribution means 90.
  • FIG. 44 shows an example of a manufacturing method of the tape-type disposable diaper shown in FIG. 35 and FIG.
  • the supply of the intermediate sheet (second sheet) 40 is the same as in the case of the pants type.
  • the top sheet 30 is subsequently supplied from the upper side
  • the liquid-impermeable sheet 70 is supplied from the lower side
  • the NORY sheet 64 constituting the NORY cuff 60 is supplied.
  • the supply line of the noir sheet 64 the supply force in a state in which the rubber thread 62 is fixed under stretch between two nonwoven fabrics is previously provided by a device (not shown).
  • the semi-finished product with the absorbent main body is cut by the cutter device 98 and the product 10 is obtained.
  • Fig. 47 shows that the absorbent article 200 according to the present invention has a high absorption capacity uniformly on both sides of the crotch portion of the absorbent body and the absorbent article 200 according to the present invention in which the basis weight of the super absorbent polymer particles is smaller than that of the primary absorbent section.
  • Comparative Example 201 in which functional polymer particles were sprayed, 150 g of human urine was absorbed, and the standing force of floss 60 and the roundness of the product were compared. It can be seen that the absorbent core 200 of the absorbent article 200 according to the present invention rises high and the product is rounded to fit the body.
  • the present invention provides a force S that can be applied to absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, and diaper covers, and optimally absorbent diapers or diaper covers or paper diapers. It is a pad.
  • FIG. 1 is a perspective view of a pants-type disposable diaper.
  • FIG. 2 is a developed plan view of a pants-type disposable diaper.
  • Pants-type messenger! Forming an embossed diaper! 4 is a sectional view taken along the line 4.
  • FIG. 4 A cross-sectional view of the pant-type using the diaper embossed.
  • FIG. 5 is a cross-sectional view of another first example of emboss formation.
  • FIG. 6 is a cross-sectional view of another second example of emboss formation.
  • FIG. 7 is a cross-sectional view of another third example of emboss formation.
  • FIG. 8 is a developed plan view of a tape-type disposable diaper.
  • FIG. 9 is a cross-sectional view taken along line 9 9 in FIG.
  • FIG. 10 is a perspective view of a pants-type disposable diaper.
  • FIG. 11 is a developed plan view of a pants-type disposable diaper.
  • FIG. 12 is a cross-sectional view taken along line 3-3 in FIG.
  • FIG. 13 is a cross-sectional view of another example.
  • FIG. 14 is a cross-sectional view of another example.
  • FIG. 15 is a cross-sectional view of another example.
  • FIG. 16 is a cross-sectional view of another example.
  • FIG. 17 is a cross-sectional view of another example.
  • FIG. 18 is a developed plan view of a tape-type disposable diaper.
  • FIG. 19 is a cross-sectional view taken along line 9 9 in FIG.
  • ⁇ 21 It is a schematic diagram showing an example of manufacturing equipment for a pants-type disposable diaper.
  • ⁇ 22 It is a schematic diagram showing an example of manufacturing equipment for a tape-type disposable paper diaper.
  • FIG. 23 A schematic diagram of the opening facility.
  • FIG. 24 is a schematic view of a widening device.
  • FIG. 25 is a sectional view taken along the line XV—XV in FIG. 24.
  • FIG. 26 is a schematic view of a thickening device.
  • FIG. 27 is a schematic diagram of an example of an SAP supply device.
  • FIG. 28 is a perspective view of a pants-type messenger!
  • FIG. 29 is a developed plan view of a pants-type disposable diaper.
  • 30 is a cross-sectional view taken along line 3—3 in FIG.
  • FIG. 31 is a cross-sectional view taken along line 3-3 of another example.
  • FIG. 32 is a cross-sectional view of another example taken along line 3—3.
  • FIG. 33 is a cross-sectional view corresponding to the line 3—3 of the modification.
  • FIG. 34 is a cross-sectional view of another example taken along line 3-3.
  • FIG. 35 is a developed plan view of a tape-type disposable diaper.
  • FIG. 36 is a cross-sectional view taken along the line 99 in FIG. 35.
  • FIG. 37 is a schematic diagram showing an example of manufacturing equipment for a pants-type disposable diaper.
  • FIG. 38 is a schematic diagram of the main part.
  • FIG. 39 is a schematic diagram of a widening device.
  • FIG. 40 is a cross-sectional view taken along the line ⁇ in FIG. 39.
  • FIG. 41 is a schematic diagram of a fiber opening device.
  • ⁇ 42 It is a schematic diagram of an example of a superabsorbent polymer particle spraying means.
  • FIG. 44 is a schematic diagram showing an example of a manufacturing facility for a tape-type disposable paper diaper.
  • FIG. 45 is a schematic diagram showing a planar arrangement of SAP and adhesive in the absorbent body.
  • FIG. 46 is a diagram showing an example of a holding sheet.
  • FIG. 47 is a diagram showing experimental results.
  • 10 Pants-type disposable diapers, 10A... Tape-type disposable diapers, 12 ⁇ Exterior sheet, 12 ⁇ ⁇ Knock sheet, 20 ⁇ 50 ... Absorbing element, 52 ⁇ Filament, 52 ⁇ ⁇ Veil, 52 ⁇ ⁇ ⁇ ⁇ Tow, 52 ⁇ ⁇ ⁇ ⁇ Aggregation of filaments, 54 ⁇ ⁇ ⁇ Highly absorbent polymer particles, 56 ⁇ ⁇ ⁇ Absorber, 56 ⁇ ⁇ night Impervious sheet, 72 ... Second liquid impervious sheet, 80 ... Retaining sheet, ⁇ ... Heat fusion part, 90 ... Super absorbent polymer particle spraying means, 90 ⁇ ... Projection part, 90a ... Case, 90b ... Rotating drum , 90c ...

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  • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

Le problème à résoudre dans le cadre de cette invention concerne une amélioration de la stabilité de forme d’un ensemble de filaments et des propriétés d’ajustement à la peau d’un utilisateur. La solution proposée consiste à former, dans une zone où se trouve un absorbant (56) ayant un ensemble de filaments, un relief rainuré (Em) disposé de manière approximative dans un sens de longueur sur au moins les deux côtés d’un bassin d’un utilisateur. Le relief (Em) s’étend d’une feuille supérieure (30) jusqu’à l’absorbant (56).
PCT/JP2006/321431 2005-10-26 2006-10-26 Article absorbant WO2007049725A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2005310659A JP4841224B2 (ja) 2005-10-26 2005-10-26 吸収性物品
JP2005-310659 2005-10-26
JP2005-376645 2005-12-27
JP2005376645A JP4969101B2 (ja) 2005-12-27 2005-12-27 吸収性物品の製造方法
JP2006101161A JP4724587B2 (ja) 2006-03-31 2006-03-31 吸収性物品
JP2006-101161 2006-03-31

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WO2007049725A1 true WO2007049725A1 (fr) 2007-05-03

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010113754A1 (fr) * 2009-03-31 2010-10-07 住友精化株式会社 Feuillet absorbant l'eau
WO2011094120A1 (fr) * 2010-01-28 2011-08-04 Sca Hygiene Products Ab Article absorbant doté d'une partie centrale absorbante fendue
US8979815B2 (en) 2012-12-10 2015-03-17 The Procter & Gamble Company Absorbent articles with channels
US9060904B2 (en) 2007-06-18 2015-06-23 The Procter & Gamble Company Disposable absorbent article with sealed absorbent core with substantially continuously distributed absorbent particulate polymer material
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