WO2020004645A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2020004645A1
WO2020004645A1 PCT/JP2019/025912 JP2019025912W WO2020004645A1 WO 2020004645 A1 WO2020004645 A1 WO 2020004645A1 JP 2019025912 W JP2019025912 W JP 2019025912W WO 2020004645 A1 WO2020004645 A1 WO 2020004645A1
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WO
WIPO (PCT)
Prior art keywords
cover sheet
liquid
core cover
core
sheet
Prior art date
Application number
PCT/JP2019/025912
Other languages
English (en)
Japanese (ja)
Inventor
大坪　俊文
規弘 時田
芳久 渡部
竜也 田村
野田　祐樹
伸亨 加藤
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018125325A external-priority patent/JP6838013B2/ja
Priority claimed from JP2018125326A external-priority patent/JP6839135B2/ja
Priority claimed from JP2018125327A external-priority patent/JP6838014B2/ja
Priority claimed from JP2018125328A external-priority patent/JP6838015B2/ja
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to KR1020217030534A priority Critical patent/KR102560789B1/ko
Priority to CN201980043799.3A priority patent/CN112334111B/zh
Priority to CN202210275863.4A priority patent/CN114748249B/zh
Priority to CN202210275862.XA priority patent/CN114748248B/zh
Priority to KR1020207003086A priority patent/KR102381597B1/ko
Publication of WO2020004645A1 publication Critical patent/WO2020004645A1/fr

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    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
    • A61F2013/530343—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp being natural fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/5349—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad being a tissue-wrapped core
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53765—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
    • A61F2013/53778—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with 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
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
    • A61F2013/8408—Additives, e.g. for odour, disinfectant or pH control with odour control

Definitions

  • the present invention relates to an absorbent article, and more particularly, to an absorbent article such as a light incontinence pad, a panty liner, a sanitary napkin, a vaginal absorbent pad, a urine absorbent pad, a disposable diaper for adults and children.
  • an absorbent article such as a light incontinence pad, a panty liner, a sanitary napkin, a vaginal absorbent pad, a urine absorbent pad, a disposable diaper for adults and children.
  • Patent Document 1 discloses that tissue paper or the like is used without bleaching.
  • JP 2011-505505 A JP 2016-120192 A JP-A-56-53745
  • Patent Document 2 discloses that a deodorant-containing sheet using granular activated carbon as a deodorant and two covering sheets covering the front and back surfaces of the sheet form a deodorant sheet. ing.
  • Patent Literature 3 discloses an absorbent article provided with an absorbent containing wood pulp fiber that has not been subjected to delignification treatment.
  • the wood pulp fiber has a natural color derived from natural wood because the wood pulp fiber contained in the absorber is not subjected to delignification treatment, and the absorber has a surface sheet. Can give an impression to a wearer or the like that the product is a natural-oriented product using a natural material.
  • the cellulose component is highly hydrophilic, whereas lignin has low hydrophilicity and can be said to be hydrophobic. Therefore, the pulp fibers that have not been subjected to delignification treatment have high hydrophobicity, and when the pulp fibers are distributed throughout the absorber, the humor cannot be absorbed by the body fluid from the surface of the absorber and absorbed and retained. .
  • the third and fourth inventions are improvements of the conventional invention, and provide an absorbent article provided with an absorber having a natural color tone inherent to wood and capable of sufficiently absorbing and retaining body fluid. Make it an issue.
  • the first invention is directed to a liquid-permeable top sheet positioned on the skin-facing surface side, a liquid-impermeable back sheet positioned on the non-skin-facing surface side, and an absorbent positioned between the top sheet and the back sheet. And an absorbent article including a body.
  • the absorber includes a liquid-absorbent core and a core cover sheet that covers the liquid-absorbent core, and the core cover sheet is provided on the skin-facing surface side of the liquid-absorbent core.
  • a first core cover sheet that covers at least a part thereof and includes a first pulp fiber; and a second core cover sheet that covers at least a part of a non-skin facing surface side of a liquid-absorbent core and includes a second pulp fiber.
  • the kappa number of the second pulp fiber is smaller than the kappa number of the first pulp fiber.
  • the kappa number of the first pulp fiber is 8 to 40, and the difference between the kappa number of the second pulp fiber and the kappa number of the first pulp fiber is 2.4 or more. For this reason, since the first pulp fiber of the first core cover sheet has a relatively large amount of lignin component, it is possible to further reduce chemical substances.
  • the difference between the kappa number of the second pulp fiber and the kappa number of the first pulp fiber is 7.2 or more.
  • the skin-facing surface of the absorber can be made to have a wood-derived color, giving an impression that the article is a natural-oriented article using a natural material.
  • the first core cover sheet has both side edges located between the non-skin-facing surface of the liquid-absorbent core and the second core cover sheet. For this reason, the area of the first core cover sheet visible from the skin-facing surface can be reduced as much as possible so that the white area can be widened, and the user can be given an impression that the article is clean.
  • the absorbent article has a horizontal direction and a vertical direction, and a total of the horizontal dimensions of both side edges is smaller than 1/3 of the horizontal dimension of the liquid-absorbent core. For this reason, the second core cover sheet can be visually recognized from the non-skin-facing surface, and it is possible to prevent mistaken presence or absence of urination.
  • the first core cover sheet is overlapped in the thickness direction on the lateral outer sides of both side edges of the liquid absorbent core. For this reason, the brown on both sides of the liquid-absorbent core can be darkened, and the user can recognize the position of the liquid-absorbent core.
  • Absorbent article and a horizontal and vertical direction, opposite side edges and opposite side edges of the second core cover sheet of the first core cover sheet may extend laterally outside than both side edges of the absorbent core
  • the first core cover sheet and the second core cover sheet are joined to the outer side of both sides of the absorbent core in the lateral direction. For this reason, the visible area of the first core cover sheet viewed from the skin-facing surface side can be made as large as possible, the portion having a wood-derived color can be enlarged, and a natural-oriented article using a natural material can be used. You can give the impression that there is.
  • the length dimension of the joint between the first core cover sheet and the second core cover sheet is 50 mm or less. For this reason, the use of a bonding agent such as a hot melt adhesive can be reduced as much as possible, and waste of materials can be suppressed.
  • an indicator capable of identifying the presence or absence of excrement from the outside of the back sheet is located on the non-skin-facing surface side of the liquid-absorbent core, and the indicator and the second core cover sheet overlap in the thickness direction. I have. Since the second core cover sheet around the indicator is white, it is possible to prevent mistaken presence or absence of urination.
  • the absorbent article another member is located between the top sheet and the first core cover sheet. Therefore, the first core cover sheet allows the user to grasp the position of another member.
  • the topsheet has a convex portion and a concave portion each extending in the vertical direction and alternately arranged in the horizontal direction, and the concave portion is in contact with the absorber, while the convex portion is from the absorber. is seperated. For this reason, in the convex portion, the brown color of the first core cover sheet can be reduced, and the user can be given an impression that the article is clean.
  • the liquid-absorbent core has a small width in the center in the longitudinal direction, in which the horizontal dimension of the liquid-absorbent core is small, and a portion that overlaps with the narrow region in the back sheet has a colored portion. .
  • the first core cover sheet outside the narrow area can be prevented from being viewed from the non-skin-facing surface side, and the user can be given an impression that the article is clean.
  • a second invention provides a liquid-permeable top sheet located on the skin-facing surface side, a liquid-impermeable back sheet located on the non-skin-facing surface side, and a position between the top sheet and the back sheet. And an absorbent article including the absorbent.
  • the absorber has a liquid-absorbent core and a core cover sheet that covers at least the skin-facing surface side of the liquid-absorbent core, and a material constituting the absorber is a lignin component.
  • the L value, a value, and b value in the Lab color system are 0.5 ⁇ the a value ⁇ 10.0, 7 ⁇ the b value. ⁇ 15, 70 ⁇ The L value ⁇ 90.
  • the absorbent article when standard menstrual blood is dropped onto the liquid-absorbent core through the topsheet, a Lab color system is used in the menstrual blood absorption region and the non-menstrual blood absorption region viewed from the skin-facing surface side. Is 50 or less, and the difference between the b values is 20 or less. For this reason, the difference between the a value and the b value can be reduced, and the discomfort when the user or the caregiver views the absorbent article after use can be suppressed.
  • the core cover sheet has a first covering portion that covers at least the skin-facing surface side of the liquid-absorbent core, and the first covering portion and the topsheet are bonded via an adhesive. Bonded to each other, the content of the lignin component of the core cover sheet is higher than the content of the lignin component of the liquid-absorbent core, and is continuous from the topsheet to a part of the liquid-absorbent core in the thickness direction. And has a plurality of concave portions extending. For this reason, excretions such as menstrual blood and urine can be retained in the concave portion, and the surface area of the liquid-absorbing core in contact with menstrual blood can be increased indirectly via the topsheet and the core cover sheet. The excrement can be promptly absorbed and held in the absorbent core via the front and back sheets.
  • the concave portion has a bottom, and the topsheet, the core cover sheet, and a part of the liquid-absorbent core are compressed, and the bottom of the concave portion is a peripheral region of the concave portion.
  • the density is higher than that of. Therefore, the excrement accumulated in the concave portion can be quickly drawn into the liquid-absorbent core, and the excrement can be absorbed and held.
  • the concave portion is a through hole that penetrates the topsheet and the absorber in the thickness direction. For this reason, since the liquid-impervious back sheet is located at the bottom of the concave portion, the excrement accumulated in the concave portion does not leak to the non-skin-facing surface side of the absorber, and the peripheral portion of the concave portion Excrement can be absorbed and retained in the absorbent core.
  • a third invention provides a liquid-permeable top sheet located on the skin-facing surface side, a liquid-impermeable back sheet located on the non-skin-facing surface side, and a position between the top sheet and the back sheet. And an absorbent article including the absorbent.
  • the absorbent body includes a liquid-absorbent core and a core cover sheet that covers at least the skin-facing surface side of the liquid-absorbent core, wherein the core cover sheet is In the first covering portion that covers the skin-facing surface side of the liquid-absorbent core, the content of the lignin component is higher than the peripheral region, and has a plurality of high lignin regions scattered and located in plan view, The content of the lignin component of the core cover sheet is higher than the content of the lignin component of the liquid-absorbent core.
  • the absorbent article according to the third invention includes the following embodiments.
  • the core cover sheet has a lignin component content of 0.2 to 10%.
  • the core cover sheet has a crepe ratio of 7 to 20% and a formation index of 50 to 300.
  • the core cover sheet contains wood or non-wood pulp fibers, and the liquid absorbent core contains cellulosic fibers.
  • the liquid-absorbent core contains particles having odor-adsorbing performance.
  • the absorber has a plurality of concave portions that are concave from the skin facing surface side toward the non-skin facing surface side.
  • the core cover sheet further includes a second covering portion that covers the non-skin-facing surface side of the liquid-absorbent core, and the plurality of high lignin regions are located in the second covering portion.
  • the topsheet contains cotton fibers, and the core cover sheet has a higher Krem water absorption than the topsheet.
  • the topsheet has a first portion and a second portion having a higher fiber density than the first portion, and the first portion is joined to the high lignin region, Two parts are joined with the low lignin zone.
  • the topsheet has a multilayer structure, and the layer located on the side facing the skin is mainly made of cotton fibers.
  • the top sheet has a Klem water absorbency lower than that of the core cover sheet.
  • a fourth invention is directed to a liquid-permeable top sheet positioned on the skin-facing surface side, a liquid-impermeable back sheet positioned on the non-skin-facing surface side, and a position between the top sheet and the back sheet. And an absorbent article including the absorbent.
  • an absorbent article wherein the absorbent body has a liquid-absorbent core and a core cover sheet that covers at least the skin-facing surface side of the liquid-absorbent core, wherein the core cover sheet is A first covering portion for covering the skin-facing surface side of the liquid-absorbent core, wherein the first covering portion and the topsheet are joined to each other via an adhesive, and a lignin of the core cover sheet is provided.
  • the content of the component is higher than the content of the lignin component of the liquid-absorbent core, and in the thickness direction, a plurality of concave portions extending continuously from at least the topsheet to a part of the liquid-absorbent core. It is characterized by having.
  • the absorbent article according to the fourth invention includes the following embodiments.
  • the core cover sheet further includes a second covering portion that covers the non-skin-facing surface side of the liquid-absorbing core, and the second covering portion and the back sheet are mutually bonded via an adhesive.
  • the concave portion has a bottom, and the top sheet, the core cover sheet, and a part of the liquid-absorbent core are compressed, and the thin portion where the concave portion is located is the concave portion. The density is higher than that of the thick portion where no is located.
  • the concave portion is an opening that penetrates the topsheet and the absorber in the thickness direction.
  • the adhesive is a SIS-based hot melt adhesive.
  • the core cover sheet has a plurality of high lignin regions in which the content of the lignin component is higher than that in the peripheral region and is scattered in plan view.
  • the core cover sheet has a crepe ratio of 7 to 20% and a formation index of 50 to 300.
  • the topsheet has a first portion and a second portion having a higher fiber density than the first portion, wherein the first portion is joined to the high lignin region, Two parts are joined with the peripheral area.
  • the topsheet has a multilayer structure, and the layer located on the skin-facing surface side is mainly composed of cotton fibers. (10)
  • the top sheet has a Klem water absorbency lower than that of the core cover sheet.
  • the kappa value of the second pulp fiber of the second core cover sheet 122b is smaller than the kappa value of the pulp fiber of the first core cover sheet. High in unbleached pulp fiber. Therefore, unbleached pulp fibers use less chemical substances, and can provide an absorbent article with reduced use of chemical substances.
  • the second core cover sheet located on the non-skin-facing surface side has a small kappa value and is white, it is possible to reduce the possibility of making a mistake in excretion.
  • the absorber has the absorbent core and the core cover sheet that covers at least the skin-facing surface side of the absorbent core, and constitutes the absorbent body.
  • the material contains a lignin component. Therefore, it is possible to provide an absorbent article using unbleached pulp fibers for the absorber and reducing the use of chemical substances.
  • the L value, a value, and b value in the Lab color system are 0.5 ⁇ a value ⁇ 50.0, 7 ⁇ b value ⁇ 15, 70 ⁇ Both conditions of L value ⁇ 90 are satisfied.
  • the constituent material contains a lignin component, the color of the absorber becomes light brown due to the lignin component.
  • Excretions such as menstrual blood or urine are excreted into an absorbent article having a light brown absorbent, and when the absorbent absorbs and retains the excrement, red of menstrual blood or yellow of urine is suppressed. Therefore, discomfort when the user or caregiver views the absorbent article after use can be suppressed. Therefore, it is possible to provide an absorbent article that makes effective use of the color used for the absorber.
  • the absorber since the absorber has a wood-derived color, it is possible to give an impression that the absorbent article is a skin-friendly product using a natural material.
  • the absorber can realize appropriate adhesiveness to the topsheet and liquid absorption.
  • the core cover sheet contains a relatively large amount of lignin component
  • the core cover sheet has a natural color derived from natural materials such as wood, and has a thickness direction.
  • FIG. 4 is a partially broken development plan view of the diaper in a state where the side seam portion is peeled off and extended in the vertical and horizontal directions, as viewed from the skin-facing surface.
  • FIG. 3 is a sectional view taken along line III-III of FIG. 2.
  • FIG. 5A is a partially enlarged view of a region surrounded by a line V (a) in FIG. (B) Partly enlarged view of a region surrounded by line V (b) in FIG.
  • FIG. 5A is a partially enlarged view of a region surrounded by a line V (a) in FIG. (B) Partly enlarged view of a region surrounded by line V (b) in FIG.
  • FIG. 4 is a partially broken development plan view similar to FIG. 2 of the diaper according to the second embodiment of the first invention.
  • FIG. 7 is a sectional view taken along line VIII-VIII of FIG. 6.
  • FIG. 7 is a partially exploded plan view similar to FIG. 2 of the diaper according to the third embodiment.
  • FIG. 10 is a sectional view taken along line XX of FIG. 9.
  • FIG. 6 is a partially broken development plan view similar to FIG. 2 of the diaper of the second embodiment.
  • FIG. 14 is a sectional view taken along line XV-XV in FIG. 13.
  • FIG. 17 is a partially enlarged view of a region surrounded by line XVII in FIG. 16.
  • FIG. 17 is a partially enlarged view of a region surrounded by a dashed-dotted line XVIII-XVIII in FIG. 15.
  • the top view of the sanitary napkin concerning a 2nd embodiment of a 2nd invention.
  • A A sectional view taken along line XX (a) -XX (a) of FIG.
  • FIG. 20A A cross-sectional view similar to FIG. 20A in an example of a modification of the absorber according to the second embodiment.
  • FIG. 20A A cross-sectional view similar to FIG. 20A in an example of a modification of the absorber according to the second embodiment.
  • FIG. 6 is a plan view of an absorbent article according to a third embodiment of the second invention.
  • XXIV-XXIV sectional drawing of FIG. The top view of an absorber.
  • FIG. 26 is a partially enlarged view of a region surrounded by line XXVI in FIG. 25.
  • FIG. 27 is a partially enlarged view of a region surrounded by a dashed line XXVII-XXVII in FIG. 24.
  • FIG. 29 (b) is a cross-sectional view similar to FIG. 29 (a) in an example of a modification of the absorber according to the second embodiment of the third invention.
  • FIG. 10 is a plan view of an absorbent article according to a third embodiment of the third invention. The top view which looked at the sanitary napkin from the surface side in a 1st embodiment of an absorptive article concerning a 4th invention. The top view which looked at the sanitary napkin from the back side. The top view of an absorber.
  • FIG. 34 is a sectional view taken along the line XXXIV of FIG. 33.
  • FIG. 35 is a cross-sectional view similar to FIG. 34 illustrating an example of a modification of the absorber.
  • FIG. 37 is a partially enlarged view of a region surrounded by a line XXXVII in FIG. 36.
  • FIG. 35 is a sectional view similar to FIG. 34 of the sanitary napkin according to the second embodiment of the fourth invention.
  • FIG. 13 is a plan view of an absorbent article according to a third embodiment of the fourth invention.
  • the disposable diaper 101 which is an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings.
  • the disposable diaper 101 has a horizontal direction X, a vertical direction Y, and a thickness direction Z that intersect (orthogonally) with each other.
  • the disposable diaper 101 has a vertical center line bisecting the dimension in the width direction and a horizontal center line bisecting the dimension in the length direction.
  • the elastic waist panel 102 has an elastic belt function of expanding and contracting in the waist direction, and includes a front waist panel 107 forming the front waist region 104 and a rear waist panel 108 forming the front waist region 105.
  • the front waist panel 107 includes an inner edge 107a, an outer edge 107b, first side edges 107c and 107d extending inward in the vertical direction Y from the outer edge 107b, and first and second edges 107c and 107d. It has a substantially trapezoidal shape defined by second side edges 107e and 107f extending obliquely inward in the vertical direction Y from both side edges 107c and 107d.
  • the rear waist panel 108 includes an inner edge 108a, an outer edge 108b, first side edges (side edges of the front waist region 105) 108c and 108d extending inward in the vertical direction Y from the outer edge 108b, It has a substantially trapezoidal shape defined by first side edges 108c and 108d and second side edges 108e and 108f extending obliquely inward in the vertical direction Y.
  • the first side edges 107c, 107d of the front waist panel 107 facing each other and the first side edges 108c, 108d of the rear waist panel 108 are overlapped with each other and connected by side seams 109 intermittently arranged in the vertical direction Y (for example, , Heat embossing, sonic, etc.), and a waist opening 110 and a pair of leg openings 111 are defined.
  • side seams 109 intermittently arranged in the vertical direction Y (for example, , Heat embossing, sonic, etc.), and a waist opening 110 and a pair of leg openings 111 are defined.
  • the front and rear waist panels 107 and 108 include inner layer sheets (inner sheets) 112 and 113 located on the skin facing surface side and outer layer sheets (outer sheets) 114 and 115 located on the non-skin facing surface side, respectively.
  • the inner and outer layer sheets 112 to 115 are made of an SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, a spunbond fiber nonwoven fabric or an air-through fiber nonwoven fabric having a mass of 10 to 30 g / m 2 , or a plastic sheet, a perforated plastic sheet and the like.
  • SMS spunbond / meltblown / spunbond
  • a laminate sheet or the like can be used.
  • a plurality of strings or strands of front and rear waist elastics (elastic members) 116, 117 expand and contract in the horizontal direction X.
  • the front and rear waist panels 107 and 108 are elasticized at least in the lateral direction X.
  • the front and rear waist elastics 116 and 117 are partially cut or removed at the central portions of the front and rear waist regions 104 and 105 overlapping with the absorption chassis 103, respectively, so that the front and rear non-stretchable regions 18 and 19 are defined.
  • the center of the absorbing chassis 103 located on the inner surfaces of the front and rear waist panels 107 and 108 (the liquid absorbing core). Since the contraction force of the front and rear waist elastics 116 and 117 is directly applied to the (central portion) and no gather or the like is formed, it is possible to suppress a decrease in absorption performance due to the contraction force.
  • front and rear waist elastics 116 and 117 for example, a string-like or strand-like elastic material having a fineness of 470 to 1240 dtex and being stretched 1.5 to 3.5 times is used. Can be. Conditions such as the fineness of the front and rear waist elastics 116 and 117, the elongation ratio, and the separation dimension (pitch) between the elastics can be changed as appropriate.
  • the inner and outer layer sheets 112 and 114 in the front waist region 104 and the inner and outer layer sheets 113 and 115 in the front waist region 105 do not have a hot melt adhesive applied to their inner surfaces. Each is joined to each other only via the hot melt adhesive applied to the front and rear waist elastics 116 and 117. The hot melt adhesive only needs to be applied to the portion facing the inner and outer layer sheets 112 to 115 over the entire circumference of the front and rear waist elastics 116 and 117.
  • the absorbing chassis 103 includes a liquid-permeable top sheet 131 located on the skin-facing surface side, a liquid-impermeable back sheet 132 located on the non-skin-facing surface side, and both of these.
  • An absorbent body 120 having a liquid absorbing property which is located between the sheets 131 and 132 and has a narrow central portion in the vertical direction Y.
  • the topsheet 131 and the absorber 120 are joined to each other by a known joining means such as a hot melt adhesive to form the liquid absorbing layer 130.
  • a liquid-impervious leak-proof sheet 136 having air permeability is preferably arranged in order to suppress leakage of excrement such as urine.
  • the size in the horizontal direction X and the size in the vertical direction Y of the leakage prevention sheet 136 are larger than the size in the horizontal direction X and the size in the vertical direction Y of the liquid-absorbent core 121.
  • the entire area is covered with a leak-proof sheet 136.
  • the back sheet 132 has both side portions 134 located outside the side edges of the absorber 120 in the lateral direction X. Both side portions 134 are bent to the skin facing surface along a bending line 135 extending in the vertical direction Y, fixed to the topsheet 131 and separated from each other in the vertical direction Y, and both end fixing portions 133, both sides of the topsheet 131 A proximal edge 137 fixed to the edge and located outside in the lateral direction X, and a distal edge extending in the vertical direction Y between the both-end fixing portions 133 and parallel to the proximal edge 137 (free edge) 138).
  • the distal edge portion 138 has a sleeve shape formed by bending and fixing an outer edge portion of the back sheet 132 in the lateral direction X, and a string-like or strand-like cuff elastic member 128 extending in the longitudinal direction Y extends. It is fixed to the back sheet 132 in such a manner that it can contract in a state. The contraction of the cuff elastic body 128 causes the distal edge portion 138 to separate from the topsheet 131, and the distal edge portion 138 comes into contact with the wearer's thigh to form a leak-proof cuff, and the leak-proof cuff is excreted. Prevent leaks.
  • a string-like or strand-like leg elastic body 129 extending in the vertical direction Y is provided on the outer side of the cuff elastic body 128 in the lateral direction X in such a manner that the leg elastic body 129 can contract in an extended state. It is fixed. When the leg elastic body 129 contracts, both side portions 134 of the back sheet 132 contact the thigh of the wearer.
  • the topsheet 131 can be formed from various liquid-permeable fibrous nonwoven fabrics, for example, an air-through fibrous nonwoven fabric having a mass of about 15 to 45 g / m 2 , a porous plastic film, or a laminate sheet thereof.
  • the back sheet 132 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable fibrous nonwoven fabric, a laminate sheet thereof, and the like.
  • the absorbent body 120 is made of a liquid-absorbent core formed by mixing superabsorbent polymer particles (SAP) with cellulosic fibers such as fluff wood pulp and rayon fibers and shaping the mixture into a predetermined shape. 121, and a liquid-permeable core cover sheet 122 that covers the entire liquid-absorbent core 121 in order to improve the shape retention and liquid diffusibility.
  • SAP superabsorbent polymer particles
  • the liquid-absorbent core 121 is located at both ends in the vertical direction Y and has a constant width X in the wide region 121c, and is located at the center in the vertical direction Y and has a larger width X in the horizontal direction than the wide region. It has a small narrow area 121d. In the wearing state of the diaper 101, the narrow region 121d is located at the base of the leg, and when the leg is moved, the leg can be prevented from hitting both side edges 121a and 121b of the liquid absorbent core 121 having high rigidity.
  • the back sheet 132 has a colored portion in a portion overlapping the narrow region 121d, and the first core cover sheet 122a outside the narrow region 121d is visually recognized from the non-skin facing surface side. Can be prevented, and the user can be given an impression that the article is clean.
  • the core cover sheet is located on the skin-facing surface side of the liquid-absorbent core 121, the first core cover sheet 122a containing the first pulp fiber, and the second core cover sheet is located on the non-skin-facing surface side of the liquid-absorbent core 121, A second core cover sheet 122b containing pulp fibers.
  • the first and second core cover sheets 122a and 122b have a dimension in the lateral direction X larger than the dimension in the lateral direction X of the liquid-absorbent core, and cover the entire liquid-absorbent core 121. Outside the liquid absorbing core 121 in the lateral direction X, the first and second core cover sheets are laminated so as to be in contact with each other, and the contacted portions are joined by a known joining means such as a hot melt adhesive.
  • the first and second core cover sheets 122a and 122b are formed from various known fiber nonwoven fabrics or tissues, and are mainly formed of pulp fibers.
  • the first core cover sheet 122a contains a large amount of unbleached pulp fibers (first pulp fibers) 142 that have not been subjected to delignification treatment.
  • the second core cover sheet 122b contains a large amount of bleached pulp fibers (second pulp fibers) 141 subjected to delignification treatment.
  • the pulp fibers include non-wood pulp fibers made of linter, manila hemp, kenaf, straw, bamboo, and banana, in addition to wood pulp fibers obtained from softwood or hardwood.
  • pulp fiber is subjected to a raw chip processing step, and then to a cooking step (first stage of delignification processing) in which a lignin is digested by adding a chemical to the raw chip and boiling under high temperature and high pressure.
  • first stage of delignification processing in which a lignin is digested by adding a chemical to the raw chip and boiling under high temperature and high pressure.
  • second stage of delignification process By passing through a screen process for removing foreign matter, an oxygen exposure process for decomposing lignin remaining in the digestion process with oxygen (second stage of delignification process), and a bleaching process for bleaching pulp using a plurality of chemicals,
  • the bleached pulp fibers 141 are bleached.
  • the unbleached pulp fiber 142 is obtained through, for example, only the digestion step and the screening step, which are the first stage of the delignification treatment, of these steps, and is subjected to a certain degree of delignification treatment. is there.
  • the lignin content of the unbleached pulp fibers 142 according to the present invention is between 0.2 and 10.0%.
  • the lignin content of the unbleached pulp fiber 142 and the bleached pulp fiber 141 was measured by the following method.
  • ADF quantitative reagent acidic detergent solution ⁇ 10 g of cetyltrimethylammonium bromide (hexadecyltrimethylammonium bromide) dissolved in 500 mL of 1N sulfuric acid> Acetone Decahydronaphthalene as antifoam (optional) ⁇ Measurement procedure> A 300 g sample was weighed and placed in a 50 mL Erlenmeyer flask, and 30 mL of the acidic datagen and the solution were added. The flask was capped with aluminum foil, placed in boiling water in an Erlenmeyer flask, and disintegrated for 60 minutes.
  • the mixture was transferred to a gou-ttsuru crucible covered with glass fiber filter paper (GA-200), subjected to suction filtration, and the residue was washed with hot water and acetone. After air-drying, it was heat-dried.
  • the weight after drying is constant weight and after subtracting the ash content is ADF, the ash content after lignin quantification cannot be used for this.
  • Lignin quantitative reagent 72% sulfuric acid ⁇ Measurement procedure> After dripping a few drops of 72% sulfuric acid on the dried goo-tchi crucible to wet the whole, sulfuric acid of about twice the amount of ADF was added, and the mixture was allowed to stand for 3 to 4 hours while adding sulfuric acid appropriately every hour. Thereafter, the solution was filtered by suction, and washed with hot water until the filtrate no longer showed acidity. After air drying, heat dry to constant weight. The goochi crucible was ashed at 550 ° C, and the ash content was determined.
  • the first core cover sheet 122a includes a low lignin region (lignin low content region) 151 having a relatively low lignin component content, and a lignin region lower than the low lignin region 151.
  • a high lignin region (lignin high content region) 152 having a high component content.
  • the low lignin region 151 is formed mainly of the bleached pulp fibers 141, and the high lignin region 152 is formed mainly of the unbleached pulp fibers 142.
  • the low lignin area 151 is a peripheral area relatively located in a wide range of the outer surface of the first core cover sheet 122a, whereas the high lignin area 152 is It is arranged so as to be scattered with respect to the low lignin area 151. Further, because of this arrangement, the first core cover sheet 122a can be said to have a sea-island structure in which the low lignin region 151 is an ocean and the high lignin region 152 is an island.
  • the second core cover sheet 122b is formed only of the bleached pulp fibers 141, for example.
  • the first core cover sheet 122a contains a large amount of unbleached pulp fibers 142
  • the first core cover sheet 122a generally has a light brown color derived from plant materials such as wood.
  • the second core cover sheet 122b has a white color because it contains only the bleached pulp fibers 141 without including the unbleached pulp fibers 142.
  • the other sheets 131 and 132 other than the first and second core cover sheets 122a and 122b have a white color as a whole by kneading a white pigment such as titanium dioxide into the constituent fibers.
  • the cover sheet 122a is easily seen through the other sheets 131 and 132 when viewed from the inside of the diaper 101.
  • the second core cover sheet 122b has a white color as a whole, it is difficult to visually distinguish the diaper 101 from the other sheets 131 and 132 when viewed from the outside.
  • the first core cover sheet 122a is formed by entanglement of a mixture of the bleached pulp fiber 141 and the unbleached pulp fiber 142 in the papermaking process to form a sheet, and the low lignin region 151 mainly includes the bleached pulp fiber. Since the unbleached pulp fibers 142 are mainly disposed in the high lignin region 141 and the high lignin region 152, the boundaries between the two regions 151 and 152 are unclear and cannot be clearly distinguished.
  • a method of forming the high lignin area 152 in the low lignin area 151 on the entire outer surface of the first core cover sheet 122a for example, a method of mixing the pulp fibers 141 and 142, a mixing ratio, and a manufacturing method may be used. It is conceivable to appropriately adjust the transfer speed of the transfer conveyor at the time, the nozzle diameter, the amount of blown air, the wind speed, and the like when pulp fibers are deposited via air jetted from a plurality of nozzles on the conveyor.
  • the unbleached pulp fiber 142 is contained in a part of the low lignin region 151 and the bleached pulp fiber 141 is contained in the high lignin region 152. It can be said that there are times. Therefore, the low lignin region 151 and the high lignin region 152 are not formed only from the bleached pulp fibers 141 and the unbleached pulp fibers 142, respectively.
  • the high lignin region 152 means a region where the content of the lignin component is higher than the low lignin region 151 which is the peripheral region in the first core cover sheet 122a. Therefore, the bleached pulp fiber 141 and the unbleached pulp fiber 142 are mixed. It can be formed without using a prepared sheet.
  • a high lignin region 152 having a higher lignin component content than the peripheral region can be formed by infiltrating the lignin component-containing solution into the nonwoven fabric sheet made of rayon fiber or synthetic fiber by scattering.
  • the first core cover sheet 122a Since the first core cover sheet 122a has a plurality of high lignin regions 152 mainly composed of the unbleached pulp fibers 142, the first core cover sheet 122a has a higher plant material in surface view than the second core cover sheet 122b composed solely of the bleached pulp fibers 141. It has a light brown (wood color) of origin and can give the wearer or wearer an image that the product is a skin-friendly product using natural materials. In addition, since the first core cover sheet 122a has a light brown color, when excreted urine (excretion) passes through the topsheet 131 and is absorbed and held by the absorber 120, the yellow color of urine is suppressed. Is done. Thereby, disgust caused by directly recognizing the color of urine can be suppressed. In addition, since the lignin component has an antibacterial action, it can be disposed of in a sanitary manner while suppressing the growth of various bacteria after use.
  • the bleached pulp fibers 141 and the unbleached pulp fibers 142 have different kappa numbers due to different lignin contents.
  • the unbleached pulp fiber 142 has a high lignin content and therefore a high kappa number, while the bleached pulp fiber 141 has a low lignin content and a low kappa number. Therefore, when the two are compared, the kappa number of the bleached pulp fiber 141 is smaller than the kappa number of the unbleached pulp fiber 142.
  • the kappa number of the bleached pulp fiber 141 is 1-2.
  • the unbleached pulp fibers 142 have a kappa number of 8 to 40.
  • the test method of a kappa number is based on JIS8211.
  • the kappa value of the bleached pulp fibers 141 of the second core cover sheet 122b is smaller than the unbleached pulp fibers 142 of the first core cover sheet 122a, and the first core cover sheet 122a is not bleached. High in pulp fiber 142. Therefore, since the unbleached pulp fiber 142 uses less chemical substances, it is possible to provide an absorbent article using less chemical substances. Moreover, since the kappa value of the pulp fibers of the second core cover sheet 122b located on the non-skin-facing surface side is small and white, the possibility of mistaken excretion can be reduced.
  • Sheet a in the uppermost column of Table 1 has a ratio of unbleached pulp fiber 142 of 0.0 and a ratio of bleached pulp fiber 141 of 1.0 to form a sheet (in other words, sheet of bleached pulp fiber 141 only). ) Means that the kappa number of the pulp fibers of the sheet is 1.0.
  • Sheet k in the lowermost column of Table 1 has a ratio of unbleached pulp fibers 142 of 25.0 and a ratio of bleached pulp fibers 141 of 0.0 to form a sheet (in other words, only unbleached pulp fibers 142).
  • To form a sheet means that the kappa number of the pulp fibers of the sheet is 25.0.
  • the sheet b in the second column from the top in Table 1 has a kappa number K1 of the unbleached pulp fibers 142 per unit weight of 2.5 and a kappa number of the bleached pulp fibers 141 per unit weight of 0.9. Therefore, the kappa number of the pulp fiber of the sheet is 3.4.
  • the liquid-absorbent core, the first core cover sheet, the leak-proof sheet, and the back sheet were laminated in this order, and an evaluation experiment was performed as to whether or not light brown could be seen with the naked eye from the back sheet side.
  • Sheets d to k were visually recognizable by the subject as light brown, and sheets a to c were visually recognizable by the subject as white. Therefore, the kappa number of the pulp fibers of the first core cover sheet 122a is preferably larger than 8.2. Further, it is clear that the degree of unbleaching is increased by appropriately bypassing the bleaching step, and if the kappa number of the pulp fiber is 40.0, the sheet becomes a brown sheet without a sense of incongruity. , The kappa number is preferably smaller than 40.0.
  • the kappa number of the pulp fibers of the core cover sheet 122 formed of only the bleached pulp fibers 141 is 1.0. Therefore, when the sheet a in Table 1 is used for the second core cover sheet 122b and the sheet d is used for the first core cover sheet 122a, the kappa number of the pulp fiber of the sheet d is 8.2, The difference between the two is 7.2. When the sheet d is used for the first core cover sheet 122a, the kappa value of the pulp fiber of the sheet d is 8.2, and when the sheet c is used for the second core cover sheet 122b, the kappa value of the pulp fiber of the sheet c is set. Since the value is 5.8, the difference between the two is 2.4.
  • the kappa value of the pulp fiber of the first core cover sheet 122a is 8 to 40, the kappa value of the pulp fiber of the second core cover sheet 122b, and the kappa value of the pulp fiber of the first core cover sheet 122a. It is preferable that the difference from the value is 2.4 or more. More preferably, the kappa value of the pulp fiber of the first core cover sheet 122a is 8 to 40, and the kappa value of the pulp fiber of the second core cover sheet 122b and the kappa value of the pulp fiber of the first core cover sheet 122a. It is preferred that the difference from the value is 7.2.
  • the reason for using these sheets is to use a white sheet for the second core cover sheet 122b located on the non-skin-facing surface side to give the user and caregiver an impression that the product is clean. Therefore, it is preferable to use at least the sheet c, more preferably, the sheet a. Further, since a light brown sheet is used for the first core cover sheet 122a located on the skin-facing surface side, and it is possible to give an impression that the article is a highly natural-oriented article using a natural material, at least the sheet d Preferably, it is used.
  • Table 2 shows the L value, a value, b value, and ⁇ E value of the sheet formed by changing the ratio [%] of the bleached pulp fiber 141 and the ratio [%] of the unbleached pulp fiber 142 in the Lab color system. .
  • the measuring instrument and the measuring method are the same as described later.
  • the sheet in Table 2 was shown to the subject, and an evaluation experiment was performed to determine whether the sheet was light brown. Then, it was possible to recognize that most of the subjects were light brown in the sheet D, and that most of the subjects were light brown in the sheet E.
  • the L value, the a value, and the b value in the Lab color system are: 82.81 ⁇ the L value ⁇ 92.53 -0.24 ⁇ the a value ⁇ 1.57 9.08 ⁇ the b value ⁇ 17.87 It is preferable that both conditions are satisfied.
  • the L value, a value, and b value in the Lab color system when the absorber including the first core cover sheet 122a is viewed from the skin-facing surface side are as follows: 70.00 ⁇ the L value ⁇ 90.00 0.50 ⁇ the a value ⁇ 10.00 7.00 ⁇ the b value ⁇ 15.00 It is preferable that both conditions are satisfied.
  • both side edges 122 c and 122 d of the first core cover sheet 122 a and both side edges 122 e and 122 f of the second core cover sheet are formed on both side edges 121 a and 121 b of the liquid absorbent core 121.
  • the first core cover sheet 122a and the second core cover sheet 122b are joined at the joint 127 outside the lateral edges 121a and 121b of the absorbent core 121 in the lateral direction X. It is. For this reason, the visible area of the first core cover sheet 122a viewed from the skin-facing surface side can be made as large as possible, the portion having a wood-derived color can be enlarged, and a natural-oriented article using a natural material is used.
  • the dimension in the lateral direction X of the second core cover sheet 122b is larger than the dimension in the lateral direction X of the first core cover sheet 122a, and the entire area of the first core cover sheet 122a is covered by the second core cover sheet 122b.
  • the diaper 101 is viewed from the non-skin-facing surface side, it is difficult to visually recognize the light brown color of the first core cover sheet 122a, and to give a third party the impression that the article is clean. Can be.
  • the length of the joint 127 is 50 mm or less. For this reason, the use of a bonding agent such as a hot melt adhesive can be reduced as much as possible, and waste of materials can be suppressed.
  • FIG. 6 is a developed plan view similar to FIG. 2 of the diaper 101 according to the second embodiment of the first invention
  • FIG. 7 is a perspective view of a top sheet 131a used for the absorber 120 of the diaper 101.
  • FIG. 8 is a sectional view taken along line VIII-VIII of FIG.
  • the basic configuration of the diaper 101 according to the present embodiment is the same as that of the diaper 101 according to the first embodiment, and therefore only different points will be described below.
  • the topsheet 131a has convex portions 161 and concave portions 162 that extend in the vertical direction Y and are alternately arranged in the horizontal direction X.
  • the concave portions 162 are in contact with the absorber 120, while the convex portions 161 are It is away from the absorber 120. For this reason, in the convex portion 161, the brown color of the first core cover sheet 122 a can be reduced, and the user can be given an impression that the product is clean.
  • the first core cover sheet 122a has both side edges 122c and 122d located between the non-skin facing surface of the liquid absorbent core 121 and the second core cover sheet 122b. For this reason, the area of the first core cover sheet 122a visible from the skin-facing surface can be reduced as much as possible, and the white area can be widened, giving the user the impression that the article is clean. .
  • the total W3 of the dimension W1 in the lateral direction X of one side edge 122c of the side edges of the first core cover sheet 122a and the dimension W2 in the lateral direction X of the other side edge 122d is equal to the suction force. It is smaller than 1/3 of the dimension W4 in the lateral direction X of the liquid core 121. For this reason, the second core cover sheet 122b can be visually recognized from the non-skin-facing surface, and it is possible to prevent mistaken presence or absence of urination.
  • the first core cover sheet 122a may be overlapped in the thickness direction Z on the outer side in the lateral direction X of both side edges 121a and 121b of the liquid-absorbent core 121. By doing so, the brown color of both side edges 121a and 121b of the liquid-absorbent core 121 can be darkened, and the user can recognize the position of the liquid-absorbent core 121.
  • FIG. 9 is a developed plan view similar to FIG. 2 of the diaper 101 according to the third embodiment of the first invention, and FIG. 10 is a sectional view taken along line XX of FIG.
  • the basic configuration of the diaper 101 according to the present embodiment is the same as that of the diaper 101 according to the first embodiment, and therefore only different points will be described below.
  • an intermediate sheet 139 which is a separate member, is located between the top sheet 131 and the first core cover sheet 122a.
  • the intermediate sheet 139 is made of bleached pulp fiber or kneaded with a pigment such as titanium dioxide in the constituent fiber, and is white. Therefore, the user can grasp the position of the intermediate sheet 139 by the light brown first core cover sheet 122a.
  • the diaper 101 has an indicator 171 that can identify the presence or absence of excrement such as urine from the outside of the back sheet on the non-skin-facing surface side of the liquid-absorbent core 121, and the indicator 171 and the second core cover.
  • the sheet 122b overlaps in the thickness direction Z. Since the second core cover sheet 122b around the indicator 171 is white, it is possible to prevent a mistake in urinating or not.
  • Table 3 shows the L value, a value, b value, and ⁇ E value of the diaper manufacturer's indicator in the Lab color system.
  • the measuring instrument and the measuring method are the same as described later.
  • the b value of each company's indicator is 15.85 to 22.72, which is yellow.
  • the indicator 171 used in the present invention is also included in this range. Since the second core cover sheet 122b of the diaper 101 is white, the position of the indicator 171 can be easily visually recognized.
  • FIG. 11 is a developed plan view similar to FIG. 2 of the diaper 101 according to the fourth embodiment of the first invention.
  • the basic configuration of the diaper 101 according to the present embodiment is the same as that of the diaper 101 according to the first embodiment, and therefore only different points will be described below.
  • the superabsorbent polymer particles 163 are interposed between the opposing surfaces of the first core cover sheet 122a and the second core cover sheet 122b.
  • the absorber 120 is disposed around the first bonding area 164 in which the superabsorbent polymer particles 163 are fixed to the sheets 122a and 122b via a bonding agent such as a hot melt adhesive, and the first bonding area 164. It has a second bonding area 165 in which the first core cover sheet 122a and the second core cover sheet 122b are directly bonded via a bonding agent such as a hot melt adhesive.
  • the first joining regions 164 are arranged at intervals in the vertical direction Y, and a second joining region 165 is arranged between the plurality of first joining regions 164. Further, the liquid-absorbent core 121 is formed only of the superabsorbent polymer particles 163.
  • FIG. 12 shows an example of the use of the absorbent article according to the first invention.
  • the absorbent body 120 is used for a sanitary napkin (absorbent article) 180.
  • the sanitary napkin 180 has a skin-facing surface (inner surface) side and a non-skin-facing surface (outer surface) side opposite thereto, first and second convex edges 180a and 180b, and a position of a horizontal center line Q.
  • the first and second side edges 180c and 180d that are convexly curved at the central portion, the liquid-permeable top sheet 131 located on the skin-facing surface side, and the stretchable and liquid-impermeable material located on the non-skin facing surface side Back sheet 132 and a liquid-absorbent absorber 120 located between the two sheets 131 and 132.
  • the absorber 120 extends in the longitudinal direction between the first edge 120a facing the first edge 180a, the second edge 120b facing the second edge 180b, and the first and second edges 120a, 120b. It has first and second side edges 120c and 120d.
  • the front and back sheets 181 and 182 extend outward from the outer periphery of the absorber 120, and a pair of side surfaces extending in the vertical direction Y so as to face each other in the horizontal direction X on the skin facing surface side of the top sheet 181.
  • a sheet 184 is arranged.
  • the pair of side sheets 184 is joined to the top sheet 181 via a side joint (not shown) formed by a known bonding means or welding means.
  • a wing portion 188 formed by a part of both side edges 187 that protrudes outward in the horizontal direction X is located at a central portion in the vertical direction Y of the sanitary napkin 180. Further, the sheets 181, 182, and 184 stacked on each other are joined to each other via an outer peripheral seal portion 189 located along the outer peripheral edge of the sanitary napkin 180.
  • Example 1 uses a sanitary napkin 180 having no intermediate sheet and having a weight per unit area of the first core cover sheet 122a of 14 g / m 2 , and Example 2 includes an intermediate sheet.
  • a sanitary napkin 180 having a mass per unit area of the first core cover sheet 122a of 20 g / m 2 was used. Further, for comparison with these Examples 1 and 2, a first core cover sheet containing a lignin component and an intermediate sheet not containing a lignin component were provided, and the mass per unit area of the first core cover sheet 122a was 14 g / unit.
  • Comparative example 1 of the napkin of m 2, of Comparative example 2 by each other with the white core coversheet containing no lignin components are used cotton topsheet napkins, and the white core coversheet containing no lignin components Similarly, when napkin of Comparative Example 3 was used and cotton was not used for the topsheet, the standard menstrual blood was dropped on the absorbent core 121 via the topsheet, and the napkin was viewed from the skin-facing surface side. The a value, the b value, and the L value of the Lab color system were measured in the blood absorption region and the menstrual non-absorption region. The experimental results are shown in Tables 4 to 7.
  • the a value is mainly related to red and green. The larger the value, the more reddish and the smaller the value, the more greenish. Negative numbers result in darker green. Referring to Table 4, in the napkins of Comparative Examples 2 and 3, since the white core cover sheet was used, the a value of the non-absorbing region was a negative number while the a value of the absorbing region was 50.0 or more. Therefore, the difference between the two is large, and the red color in the absorption region is conspicuous.
  • the a value of the non-absorbing region is 0.5 or more, which is a positive number, and the a value of the absorbing region is Is smaller than 50.0, the difference between them is 50 or less, and the red color in the absorption region can be suppressed from being conspicuous.
  • the a value of the non-absorbing region is a positive number because the light brown core cover sheet is used, but the a value of the absorbing region is small because the white intermediate sheet is used. It will exceed 50. For this reason, the red color of the absorption region becomes conspicuous.
  • the a value of the non-absorbing region is 0.50 ⁇ a value ⁇ 10.00. Further, the a value of the absorption region is preferably 50 or less. Further, the difference between the absorption region and the non-absorption region is preferably 50 or less. Regarding the a value, the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the b value mainly relates to yellow and blue. The larger the value, the yellower the color becomes, and the smaller the value, the more blue the color.
  • Table 5 in the napkin of Comparative Example 2, since the white core cover sheet was used, the b value of the non-absorbing region was smaller than 7, the b value of the absorbing region exceeded 27, and the difference between the two was smaller. The difference between the two is large, and yellow in the absorption region is conspicuous. In the napkin of Comparative Example 3, since the white core cover sheet was used, the b value of the absorption region exceeded 27, the difference between the two was large, and the yellow color of the absorption region was conspicuous.
  • the b value of the non-absorbing region is 7 or more and 15 or less, and the b value of the absorbing region is 15 or less. Is 30 or less, and the difference between them is 20 or less, so that yellow in the absorption region can be suppressed from being noticeable.
  • the napkin of Comparative Example 1 although the light brown core cover sheet was used, since the white intermediate sheet was used, the b value in the non-absorbing region was smaller than 7 (when the b value was close to 0, the blue color was reduced). Take on).
  • the color difference between the absorption region and the non-absorption region is large, and the color of the absorption region cannot be suppressed from being noticeable.
  • the b value of the non-absorbing region is 7.00 ⁇ b value ⁇ 15.00.
  • the b value of the absorption region is preferably 30 or less.
  • the difference between the absorption region and the non-absorption region is preferably 20 or less.
  • the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the L value is related to the brightness of a color. The larger the value, the whiter the color becomes, and the smaller the value, the blacker the color. Referring to Table 6, the L value is preferably 70 or more and 90 or less (70.00 ⁇ L value ⁇ 90.00). Regarding the L value, the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the whole of the first core cover sheet 122a is light brown derived from plant materials such as wood, and the absorber 120 is light brown, while the wing portion 188 is white. Therefore, the a value of the Lab color system was measured for the absorber 120 including the absorbent core 121 and the wing portion 188 not including the absorber 120.
  • a sanitary napkin 180 having no intermediate sheet and having a mass per unit area of the absorber of 14 g / m 2 was used.
  • the napkins of Comparative Examples 1 to 3 each using a core cover sheet containing no lignin component, also have an absorbent body 120 including a liquid-absorbent core 121 and an absorbent body 120.
  • the a value of the Lab color system was measured at the wing portion 188 that does not include. Table 7 shows the experimental results.
  • the absorbent core 121 does not include the lignin component has been described.
  • the present invention is not limited thereto, and the absorbent core 121 may include a lignin component.
  • the so-called pants-type diaper in which both side edges of the front and rear waist regions are joined in advance has been described.
  • the present invention is not limited to this, and can also be applied to open diapers.
  • members constituting the absorbent article may use, in addition to the materials described in this specification, known materials generally used in this kind of field without limitation. it can. Also, terms such as “first” and “second” used in this specification are used merely for distinguishing between similar elements, positions, and the like.
  • the second embodiment of the invention described below relates to an absorbent article shown in the accompanying drawings, and includes not only the essential configuration of the invention but also a selective and preferred configuration.
  • a sanitary napkin 210 which is an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings.
  • the sanitary napkin 210 has a vertical direction Y, a horizontal direction X, and a thickness direction Z that intersect (orthogonal) with each other.
  • the sanitary napkin 210 has a vertical center line P bisecting the dimension in the width direction and a horizontal center line Q bisecting the length dimension.
  • the convex surface is curved at the central portion where the opposing surface (inner surface) side and the non-skin opposing surface (outer surface) side opposite thereto, the first and second end edges 210a and 210b, and the horizontal center line Q are located.
  • the topsheet 211 and the absorber 220 are joined to each other by a known joining means such as a hot melt adhesive or the like, so that the liquid absorbing layer 213 is formed.
  • an intermediate sheet made of a relatively bulky fiber nonwoven fabric may be disposed between the topsheet 211 and the absorber 220 in order to improve the flexibility of the sanitary napkin 210.
  • a leak-proof sheet made of a liquid-impermeable fibrous nonwoven fabric or a plastic film, which preferably has air permeability is preferably arranged to suppress leakage of bodily fluids. Good.
  • the absorber 220 extends in the longitudinal direction between the first edge 220a facing the first edge 210a, the second edge 220b facing the second edge 210b, and the first and second edges 220a, 220b. It has first and second side edges 220c and 220d.
  • the front and back sheets 211 and 212 extend outward from the outer periphery of the absorber 220.
  • a pair of side sheets 214 extending in the vertical direction Y are arranged on the skin facing surface side of the top sheet 211 so as to face each other in the horizontal direction.
  • the pair of side sheets 214 is joined to the top sheet 211 via a side joint (not shown) formed by a known bonding means or welding means.
  • an elastic material extending in the vertical direction Y may be arranged on the side sheet 214 so as to be contractible in an extended state in order to form a leak-proof wall that rises toward the body in a worn state.
  • the side joint portion for fixing the side sheet 214 may be a seal line having a design element such as a floral pattern or a geometric pattern and extending in the vertical direction Y.
  • the sanitary napkin 210 is formed by a top sheet 211, a back sheet 212, and a side sheet 214, and has both ends extending in the horizontal direction X outside the first and second edges 220a, 220b of the absorber 220 in the vertical direction Y. 216 and both side edges 217 extending in the vertical direction Y outside the first and second side edges 220c and 220d of the absorber 220 in the horizontal direction X.
  • a wing portion 218 formed by a part of both side edge portions 217 protruding outward in the horizontal direction X is located at a central portion in the vertical direction Y of the sanitary napkin 210.
  • the sheets 211, 212, and 214 stacked on each other are joined to each other via an outer peripheral seal portion 219 located along the outer peripheral edge of the napkin 210.
  • a plurality of fastening areas 230 are arranged on the back side of the sanitary napkin 210.
  • the fastening area 230 is for fastening the sanitary napkin 210 to clothing such as underwear, and is formed of a plurality of lines of pressure-sensitive adhesive or pressure-sensitive adhesive extending in the vertical direction Y.
  • the fastening region 230 has a central region 231 extending in the vertical direction Y in a region overlapping with the absorber 220, and a side region 232 located at the wing portion 218.
  • the fixing area 230 is covered with a plastic film separator (not shown).
  • the surface sheet 211 can be formed from various fiber nonwoven fabrics having liquid permeability, for example, an air-through fiber nonwoven fabric having a mass of about 15 to 45 g / m 2 , a porous plastic film, a laminate sheet thereof, or the like.
  • the back sheet 212 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable fibrous nonwoven fabric, a laminate sheet thereof, and the like.
  • the side sheet 214 the same sheet material as the top sheet 211 can be used. However, in order to effectively prevent lateral leakage of body fluid, it is preferable to use a sheet material having hydrophobicity or water repellency.
  • a sheet having an uneven surface on the front side may be used.
  • the surface of such a sheet is formed from a plurality of concave portions and a plurality of convex portions alternately arranged in the vertical direction Y or the horizontal direction X.
  • Examples of the method include a method of forming a low bulk portion and a high bulk portion by controlling the amount of fibers, a method of forming a concave portion by embossing / debossing, and a method of shaping into an uneven shape.
  • the fibers are arranged such that one of the protrusions and the recesses has a different fiber density, and one is sparse and the other is dense. While the sparsely arranged portion (first portion) and the high lignin region 252 of the core cover sheet 222 described later are joined to each other, the joining strength is further increased, while the portion where the fibers are densely arranged (first portion). 2) and the low lignin region 251 are joined, so that the liquid absorbing property can be further improved.
  • a part of the concave portion of the topsheet 211 is substantially (continuously or discontinuously) surrounded by a compressed portion forming a compressed groove or a compressed concave portion formed by embossing. . In such a case, it is possible to prevent the body fluid accumulated in the concave portion from leaking in the horizontal direction X and the vertical direction Y.
  • the light brown core cover sheet 222 is visually recognized as darker than the protruding portions in the concave portions when viewed from the surface, so that a decorative effect due to color gradation occurs. .
  • the outer peripheral seal portion 219 can be singly or in combination of bonding by known bonding means such as bonding with an adhesive, ultrasonic welding, heat welding, laser welding, high-frequency welding, and embossing.
  • the sheets 211, 212, and 214 stacked in the thickness direction Z are joined to each other via an adhesive such as a hot melt adhesive.
  • an adhesive such as a hot melt adhesive.
  • Examples of the method for applying the hot melt adhesive include various known application methods such as spiral coating, coater coating, curtain coater coating, and spray coating.
  • an absorbent body 220 is made of a liquid-absorbent core 221 formed by mixing superabsorbent polymer particles (SAP) and cellulosic fibers such as fluff wood pulp and rayon fibers and shaping the mixture into a predetermined shape. And a liquid-permeable core cover sheet 222 that covers the entire liquid-absorbent core 221 in order to improve the shape retention and liquid diffusibility.
  • SAP superabsorbent polymer particles
  • cellulosic fibers such as fluff wood pulp and rayon fibers
  • the core cover sheet 222 has a dimension in the vertical direction Y that is larger than the dimension in the vertical direction Y of the liquid-absorbent core 221, and both side edges 222 a and 222 b cover the entire liquid-absorbent core 221.
  • the liquid-absorbent cores 221 are located so as to overlap with each other on the bottom surface side in the central portion in the lateral direction X.
  • a superimposed portion 223 formed by laminating the side edges 222a and 222b extending in the vertical direction Y is formed at the central portion in the horizontal direction X of the absorber 220. Is done.
  • the core cover sheet 222 has a first covering portion 225 that covers the skin-facing surface side of the liquid-absorbing core 221 and a second covering portion 226 that covers the non-skin-facing surface side of the liquid-absorbing core 221.
  • the core cover sheet 222 is formed from one continuous sheet.
  • the first core cover sheet forming the first covering portion 225 is separate from the first core cover sheet.
  • core cover sheet 222 is formed from various known fiber nonwoven fabrics or tissues, and is mainly composed of pulp fibers 240.
  • the pulp fibers 240 of the core cover sheet 222 include bleached pulp fibers 241 subjected to delignification treatment and unbleached pulp fibers 242 not subjected to delignification treatment.
  • the pulp fibers 240 include non-wood pulp fibers made of linter, manila hemp, kenaf, straw, bamboo, and banana in addition to wood pulp fibers obtained from softwood or hardwood.
  • the core cover sheet 222 is made of, for example, a first layer (upper layer or lower layer) made of a regenerated cellulose fiber such as rayon fiber or a hydrophilic fiber such as a semi-synthetic cellulose fiber, and a non-bleached non-lignin-treated layer. It may have a multilayer structure composed of a second layer (lower layer or upper layer) composed of pulp fibers 242. In such a case, as described later, even when the second layer has a sea-island structure including the low lignin region 251 and the high lignin region 252, the body fluid can be sufficiently diffused in the first layer. The unevenness of the diffusion of the bodily fluid in the entire core cover sheet 222 can be suppressed. Thereby, even after the bodily fluid is absorbed a plurality of times, it is possible to suppress a decrease in the bonding property with the topsheet 211 and to maintain a suitable liquid absorbing property.
  • the pulp fibers 240 are generally subjected to a raw chip processing step, and then a chemical step is performed at a high temperature and a high pressure to add a chemical to the raw chip to cook lignin (the first stage of delignification processing).
  • a chemical step is performed at a high temperature and a high pressure to add a chemical to the raw chip to cook lignin (the first stage of delignification processing).
  • an oxygen exposure process to decompose lignin remaining in the digestion process with oxygen (the second stage of delignification treatment)
  • a bleaching process to bleach the pulp using a plurality of chemicals.
  • the bleached pulp fiber 241 is obtained.
  • the unbleached pulp fiber 242 has undergone only a digestion step and a screen step, which are the first stage of delignification treatment, among these steps, and has been subjected to a certain degree of delignification treatment.
  • the unbleached pulp fiber 242 according to the present invention has a lignin content of 0.2 to 10.0%.
  • the lignin content of the unbleached pulp fiber 242 was measured by the following method.
  • ADF quantitative reagent acidic detergent solution ⁇ 10 g of cetyltrimethylammonium bromide (hexadecyltrimethylammonium bromide) dissolved in 500 mL of 1N sulfuric acid> Acetone Decahydronaphthalene as antifoam (optional) ⁇ Measurement procedure> A 300 g sample was weighed and placed in a 50 mL Erlenmeyer flask, and 30 mL of the acidic datagen and the solution were added. The flask was capped with aluminum foil, placed in boiling water in an Erlenmeyer flask, and disintegrated for 60 minutes.
  • the mixture was transferred to a gou-ttsuru crucible covered with glass fiber filter paper (GA-200), subjected to suction filtration, and the residue was washed with hot water and acetone. After air-drying, it was heat-dried.
  • the weight after drying is constant weight and after subtracting the ash content is ADF, the ash content after lignin quantification cannot be used for this.
  • Lignin quantitative reagent 72% sulfuric acid ⁇ Measurement procedure> After dripping a few drops of 72% sulfuric acid on the dried goo-tchi crucible to wet the whole, sulfuric acid of about twice the amount of ADF was added, and the mixture was allowed to stand for 3 to 4 hours while adding sulfuric acid appropriately every hour. Thereafter, the solution was filtered by suction, and washed with hot water until the filtrate no longer showed acidity. After air drying, heat dry to constant weight. The goochi crucible was ashed at 550 ° C, and the ash content was determined.
  • the first covering portion 225 of the core cover sheet 222 has a low lignin region (low lignin region) 251 having a relatively low lignin component content and a high lignin region having a higher lignin component content than the low lignin region 251. (High lignin content area) 252.
  • the low lignin region 251 is formed mainly of the bleached pulp fibers 241 and the high lignin region 252 is formed mainly of the unbleached pulp fibers 242.
  • the low lignin region 251 is a peripheral region located in a relatively wide area on the outer surface of the core cover sheet 222, whereas the high lignin region 252 is located. Are scattered with respect to the low lignin area 251.
  • the entire core cover sheet 222 or at least the first covering portion 225 has a sea-island structure in which the low lignin region 251 is the sea and the high lignin region 252 is the island.
  • the core cover sheet 222 Since the core cover sheet 222 has a plurality of high lignin regions 252, it has a light brown color derived from plant materials such as wood as a whole. Since the other sheets 211, 212, and 214 other than the core cover sheet 222 have a white color as a whole by kneading a white pigment such as titanium dioxide into constituent fibers, the core cover sheet 222 is made of the sanitary napkin 210. When viewed from the front and / or the back, the light can easily be seen through the other sheets 211, 212, and 214.
  • the core cover sheet 222 is formed by entangling a mixture of the bleached pulp fiber 241 and the unbleached pulp fiber 242 in the papermaking process to form a sheet, and the low lignin region 251 is mainly Since the bleached pulp fiber 241 and the high lignin area 252 are mainly provided with the unbleached pulp fiber 242, the boundary between the two areas 251 and 252 is unclear and cannot be clearly distinguished.
  • a method of forming the high lignin region 252 in the low lignin region 251 on the entire outer surface of the core cover sheet 222 in this manner for example, a mixing method and a mixing ratio of the pulp fibers 241, 242 are used.
  • both regions 251 and 252 are formed. Therefore, unbleached pulp fiber 242 is contained in a part of low lignin region 251 and bleached pulp fiber 241 is contained in high lignin region 252. It can be said that there are times. Therefore, the low lignin region 251 and the high lignin region 252 are not formed only from the bleached pulp fibers 241 and the unbleached pulp fibers 242, respectively, and may include fibers other than the pulp fibers.
  • the content of the bleached pulp fiber 241 in the pulp fiber in the low lignin region 251 is 50 to 100%
  • the content of the unbleached pulp fiber 242 in the pulp fiber in the high lignin region 252 is 50 to 100%.
  • the high lignin region 252 is a region in which the content of the lignin component is higher than that of the low lignin region 251 which is a peripheral region in the core cover sheet 222. Therefore, the sheet in which the bleached pulp fibers 241 and the unbleached pulp fibers 242 are mixed. It can be formed without using.
  • a high lignin region 252 having a higher content of the lignin component than the peripheral region can be formed by infiltrating the liquid containing the lignin component into the fibrous nonwoven fabric sheet made of rayon fibers or synthetic fibers in a scattering manner.
  • the core cover sheet 222 Since the core cover sheet 222 has a plurality of high lignin regions 252 mainly composed of the unbleached pulp fibers 242, the core cover sheet 222 is more plant-derived than in the case of using the core cover sheet composed only of the unbleached pulp fibers. It has a light brown color (wood color), and gives the wearer or wearer an image that the product is a skin-friendly product using a natural material. In addition, since the core cover sheet 222 has a light brown color, when excreted menstrual blood passes through the topsheet 211 and is absorbed and held by the absorber 220, redness of menstrual blood is suppressed.
  • the lignin component has an antibacterial action, it can be disposed of in a sanitary manner while suppressing the growth of various bacteria after use.
  • the content of the lignin component of the core cover sheet 222 is 0.2 to 10%. Is preferred.
  • the content of the lignin component in the core cover sheet 222 is less than 0.2%, the light brown color of the core cover sheet 222 is indistinguishable from the other sheets 211, 212, 214 having white color. There is a risk of becoming thin.
  • the content of the lignin component in the core cover sheet 222 exceeds 10%, the color due to the lignin component may be darkened, impairing the natural appearance of the natural material, and the redness of menstrual blood may be reduced. There is a possibility that the amount of menstrual blood may not be able to be accurately grasped due to difficulty in visual recognition.
  • the core cover sheet has a role of transferring the body fluid permeating the surface sheet to the liquid-absorbing core while absorbing and diffusing the body fluid transmitted through the surface sheet, in addition to the shape retention of the liquid-absorbing core. It is preferably used.
  • the unbleached pulp fibers 242 in the high lignin region 252 have a low degree of hydrophilicity due to containing a large amount of lignin components, and can be said to be relatively hydrophobic.
  • the entire first coating portion 225 is formed from the high lignin region 252. In this case, menstrual blood that has passed through the topsheet 211 cannot be absorbed and retained in the high lignin region 252, and menstrual blood cannot be transferred to the liquid-absorbent core 221 quickly.
  • the first covering portion 225 of the core cover sheet 222 has a low lignin region 251 and a plurality of high lignin regions 252 scattered around the low lignin region 251, both regions 251 and 251 are seen in a sectional view. 252 appear alternately in the horizontal direction X. Since the high lignin areas 252 are scattered in the low lignin areas 251, the low lignin areas 251 and the high lignin areas 252 are alternately arranged not only in the horizontal direction X but also in the vertical direction Y. It can be said that there is.
  • the low lignin region 251 and the high lignin region 252 are alternately positioned in the horizontal direction X and the vertical direction Y, so that menstrual blood that has passed through the topsheet 211 is hydrophilic.
  • the liquid can be promptly transferred to the liquid-absorbent core 221 to be absorbed and held, and have a required absorption speed.
  • the bleached pulp fiber swells due to the absorption of menstrual blood, so that the bonded portion is separated at the bonded interface between the topsheet 211 and the core cover sheet 222 via the hot melt adhesive. As a result, the joining strength may be reduced.
  • the high lignin region 252 since the high lignin region 252 has lower hydrophilicity and hydrophobicity than the low lignin region 251, it absorbs menstrual blood and does not easily swell, and the bonded portion does not peel off.
  • the bonding strength at the bonding interface with the topsheet 211 is higher than in the low lignin region 251.
  • the bonding strength between the core cover sheet 222 and the topsheet 211 is increased, and the bonding strength of the topsheet 211 from the absorber 220 during wearing is increased. Peeling and lifting can be suppressed.
  • the amount of the adhesive is increased to increase the bonding strength between the two sheets 211 and 222, the sheet rigidity may be increased and the flexibility and the liquid permeability may be reduced, but such disadvantages do not occur. .
  • the absorbent core 221 mainly includes SAP particles and bleached fluff pulp, and may optionally have cellulosic fibers, but does not include unbleached pulp fibers 242 and has a core cover sheet 222.
  • the lignin content is lower than that. Therefore, menstrual blood that has passed through the topsheet 211 and has been absorbed and diffused into the core cover sheet 222 is likely to be quickly transferred to the liquid-absorbent core 221 having a higher degree of hydrophilicity than the core cover sheet 222. Become.
  • the core cover sheet 222 since the plurality of high lignin areas 252 are scattered in the low lignin area 251 in the core cover sheet 222, the core cover sheet 222 has a natural appearance, a menstrual concealing property, and antibacterial properties. In addition, the core cover sheet 222 and the topsheet 211 have appropriate bonding strength and liquid absorbing properties.
  • the liquid absorbent core 221 may be formed only of the SAP particles.
  • the absorber 220 is composed of a liquid-absorbent core 221 composed of only SAP particles and a core cover sheet 222 surrounding the core.
  • the core cover sheet 222 has a low lignin area 251 and thus has a relatively low liquid retention
  • the liquid absorbent core 221 is formed only of SAP particles having a high liquid absorption capacity.
  • the absorbent 220 as a whole can exhibit appropriate liquid absorbing properties.
  • the low lignin region 251 and the high lignin region 252 are formed by the bleached pulp fiber 241 and the unbleached pulp fiber 242, the shape of the boundary line between them is unclear, and at least in plan view. It has a wavy shape instead of a linear shape. Therefore, the required absorption area of the low lignin region 251 can be maintained per unit width (for example, 1.0 mm) near the boundary between the low lignin region 251 and the high lignin region 252.
  • an overlapping portion 223 in which both side edges 222 a and 222 b of the core cover sheet 222 are stacked on each other is located at the center of the absorber 220 in the lateral direction X. Since the overlapped portion 223 is a portion where the core cover sheet 222 is folded, the light brown color of the unbleached pulp fiber is visually recognized as being darker than other portions of the absorber 220, and extends in the vertical direction Y in external appearance. It can be a design accent as a line. Further, the line extending in the vertical direction Y can be used as a mark indicating the central portion of the absorber 220 and used for positioning when the sanitary napkin 210 is attached to underwear or the like.
  • the hydrophobic high lignin area 252 is compared to the outside of the both edges in the vertical direction Y.
  • the formation index of the core cover sheet 222 is preferably 50 to 300. If the formation index of the core cover sheet 222 is less than 50, the pulp fibers are arranged densely and uniformly, so that the liquid permeability decreases, and menstrual blood cannot be transferred to the liquid-absorbing core 221 quickly. On the other hand, when the formation index exceeds 300, extremely poor formation is formed, the tensile strength is reduced, and there is a possibility that a part may be broken during use.
  • the formation index of the core cover sheet 222 was measured using a formation tester FMT-MIII manufactured by Nomura Corporation.
  • the measurement area was 250 mm ⁇ 180 mm, the measurement time was 3 seconds / sample, the formation indices of both surfaces of the three samples were measured, and the average value was used as the measured value.
  • the formation index means that the smaller the measured value, the less the formation unevenness.
  • the unbleached pulp fibers 242 are higher in rigidity than the bleached pulp fibers 241, when the core cover sheet is formed only of the unbleached pulp fibers 242, the unbleached pulp fibers 242 have relatively low flexibility. Although the core cover sheet may not follow the movement of 211 and the core cover sheet may peel off from the topsheet 211, the high lignin area 252 is scattered in the low lignin area 251 and does not greatly impair flexibility.
  • the core cover sheet 222 has a required flexibility, and specifically, the crepe ratio of the core cover sheet 222 is 7 to 20%.
  • the crepe rate of the core cover sheet 222 is less than 7%, the rigidity of the core cover sheet 222 becomes relatively high and cannot follow the movement of the topsheet 211, while the crepe rate becomes 20%. If it exceeds, the core cover sheet 222 becomes too flexible, and the sheet may be broken during manufacturing or use.
  • the crepe rate of the core cover sheet 222 was measured by an underwater elongation method.
  • the core cover sheet 222 is cut into 100 mm x 100 mm to prepare a measurement sample, the measurement sample is immersed in water for 10 seconds, then pulled up, and the crepe ratio is calculated from the amount of change in dimensions according to the following equation.
  • Crepe ratio (%) ⁇ (dimension after immersion in water) / (dimension before immersion in water) ⁇ 1 ⁇ ⁇ 100
  • a hydrophilic sheet containing cotton fibers can be used for the top sheet 211.
  • a sheet is used as the topsheet 211, it is excellent in cushioning property, softness, and liquid absorption.
  • the core cover sheet 222 has a relatively low liquid retention of constituent fibers, Since the sheet has high hygroscopicity, the moisture in the absorber 220 can be absorbed by the top sheet 211. Thereby, the generation of moisture between the sanitary napkin and the body can be suppressed, and the internal stuffiness can be suppressed.
  • the topsheet 211 has a multilayer structure made of hydrophilic fibers, and the layer located on the skin facing surface side is substantially formed of cotton fibers.
  • the cotton fibers can more efficiently absorb moisture in a portion close to the skin.
  • the core cover sheet has a higher Krem water absorption than the top sheet 211 containing cotton fibers. Since the Klemm absorption of the core cover sheet 222 is higher than the Klem absorption of the topsheet 211 located on the skin-facing surface side, the core cover sheet 222 draws menstrual blood absorbed and diffused in the topsheet 211. And the liquid can be promptly transferred to the liquid-absorbent core 221, and liquid residue on the topsheet 211 can be effectively suppressed.
  • the measurement of the Krem water absorption of the core cover sheet 222 was performed in accordance with the Krem water absorption test (JIS-L1907, P8141).
  • a measuring instrument, a stopwatch, a plastic container and artificial urine (colored with blue No. 1) were used as measuring instruments.
  • artificial urine was placed in a plastic container until the depth of the artificial urine became 10 mm or more.
  • the collected test piece was fixed with a fixed chuck, and set so as to be immersed in artificial urine at a depth of 5 mm from the tip of the sample.
  • the liquid-absorbing core is promptly used because both have high liquid retention properties. Menstrual blood cannot be transferred.
  • the core cover sheet 222 having the high lignin region 252 has a low liquid retention property as a whole, and it can be said that menstrual blood can be smoothly shifted downward.
  • the liquid-absorbent core 221 optionally has cellulose fibers such as semi-synthetic cellulose fibers such as acetate and regenerated cellulose fibers such as rayon in addition to cellulose fibers such as cotton and pulp fibers.
  • the core cover sheet 222 also has a high affinity since it has the cellulosic fiber composed of the bleached pulp fiber 241 and the unbleached pulp fiber 242, similarly to the liquid absorbent core 221, and has a high affinity in the compressed grooves and the like located on the outer periphery of the absorber. When the core cover sheet 222 and the liquid absorbent core 221 are welded to each other, the joining strength is improved.
  • the liquid-absorbent core 221 may have a plurality of functional particles formed of activated carbon, zeolite, or the like and having a function of adsorbing odors of body fluids such as menstrual blood. Since the liquid-absorbent core 221 has an odor-adsorbing property, the sanitary napkin 210 can be used and disposed more sanitarily and cleanly in combination with the antibacterial property of the core cover sheet 222.
  • the absorbent 220 of the core cover sheet 222 A plurality of high lignin regions 252 are scattered not only in the first covering portion 225 covering the skin facing surface side, but also in the second covering portion 226 covering the non-skin facing surface side of the absorber 220. Therefore, in the cross-sectional view, the low lignin regions 251 and the high lignin regions 252 are alternately located in the horizontal direction X also in the second covering portion 226.
  • the bonding strength with the back sheet 212 is lower than when a normal core cover sheet having no high lignin area 252 is used. Excellent. Therefore, in order to increase the bonding strength, it is not necessary to increase the mass per unit area of the adhesive, and the increase in the adhesive increases the sheet stiffness, and does not decrease the ability to follow the absorber 220.
  • the entire core cover sheet 222 is light brown derived from plant materials such as wood, when artificial menstrual blood is dropped (5 ml) onto the absorbent core 221 via the topsheet 211, the skin-facing surface side
  • L * a * b color system L * a * b color space, hereinafter simply abbreviated as "Lab" in the menstrual blood absorption region and the non-menstrual blood absorption region including the liquid-absorbent core 221 as viewed from above. )
  • a value, b value and L value were measured.
  • the sanitary napkin 210 having no intermediate sheet and having a mass per unit area of the core cover sheet of 14 g / m 2 was used, and Example 2 had an intermediate sheet.
  • a sanitary napkin 210 having a mass per unit area of the core cover sheet of 20 g / m 2 was used.
  • a comparative example having a core cover sheet containing a lignin component and an intermediate sheet containing no lignin component and having a mass per unit area of 14 g / m 2 of the core cover sheet The napkin of Comparative Example 2 using a napkin and a white core cover sheet containing no lignin component and using a white core cover sheet containing no lignin component and using a cotton as the surface sheet, and the surface using a napkin and a white core cover sheet containing no lignin component Similarly, when the standard menstrual blood was dropped on the absorbent core 221 via the topsheet, the menstrual blood absorption area and the menstrual blood absorption area viewed from the skin-facing surface side were similarly applied to the napkin of Comparative Example 3 in which cotton was not used for the sheet.
  • the a value, the b value, and the L value of the Lab color system were measured in the non-blood absorption region. Tables 8 to 10 show the experimental results.
  • glycerin sodium carbomethylcellulose, sodium chloride, sodium hydrogen carbonate, pigment red 102, pigment red 2, pigment yellow 5 (each pigment is manufactured by Marubeni Corporation) An appropriate mixture was used.
  • the a value is mainly related to red and green. The larger the value, the more reddish and the smaller the value, the more greenish. Negative numbers result in darker green.
  • Table 8 in the napkins of Comparative Examples 2 and 3, since the white core cover sheet was used, the a value of the non-absorbing region was a negative number, while the a value of the absorbing region was 50.0 or more. Therefore, the difference between the two is large, and the red color in the absorption region is conspicuous.
  • the a value of the non-absorbing region was 0.5 or more, which is a positive number, and the a value of the absorbing region was 50 or more.
  • the difference between them is 50 or less, so that the red color in the absorption region can be suppressed from being conspicuous.
  • the a value of the non-absorbing region is a positive number because the light brown core cover sheet is used, but the a value of the absorbing region is small because the white intermediate sheet is used. It will exceed 50. For this reason, the red color of the absorption region becomes conspicuous.
  • the a value of the non-absorbing region is 0.5 ⁇ a value ⁇ 10.0.
  • the a value of the absorption region is preferably 50 or less.
  • the difference between the absorption region and the non-absorption region is preferably 50 or less.
  • the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the b value mainly relates to yellow and blue. The larger the value, the yellower the color becomes, and the smaller the value, the more blue the color.
  • Table 9 in the napkin of Comparative Example 2, since the white core cover sheet was used, the b value of the non-absorbing region was smaller than 7, the b value of the absorbing region exceeded 27, and the difference between the two was smaller. The difference between the two is large, and yellow in the absorption region is conspicuous. In the napkin of Comparative Example 3, since the white core cover sheet was used, the b value of the absorption region exceeded 27, the difference between the two was large, and the yellow color of the absorption region was conspicuous.
  • the b value of the non-absorbing region was 7 or more and 15 or less, and the b value of the absorbing region was 30 or less. And the difference between the two is 20 or less, so that yellow in the absorption region can be suppressed from being noticeable.
  • the b value in the non-absorbing region was smaller than 7 (when the b value was close to 0, the blue color was reduced). Take on).
  • the color difference between the absorption region and the non-absorption region is large, and the color of the absorption region cannot be suppressed from being noticeable.
  • the b value of the non-absorbing region is 7 ⁇ b value ⁇ 15.
  • the b value of the absorption region is preferably 30 or less.
  • the difference between the absorption region and the non-absorption region is preferably 20 or less.
  • the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the L value is related to the brightness of a color. The larger the value, the whiter the color becomes, and the smaller the value, the blacker the color. Referring to Table 10, the L value is preferably 70 or more and 90 or less. Regarding the L value, the napkins of Examples 1 and 2 are preferable, and the napkins of Comparative Examples 1 to 3 are not preferable.
  • the whole core cover sheet 222 is light brown derived from plant materials such as wood, and the absorber 220 is light brown, while the wings 218 are white. Therefore, the a value of the Lab color system was measured in the absorber 220 including the absorbent core 221 and in the wing portion 218 not including the absorber 220.
  • the sanitary napkin 210 having no intermediate sheet and having a mass per unit area of the core cover sheet of 14 g / m 2 was used. Further, for comparison with Example 1, the napkins of Comparative Examples 1 to 3 each using a core cover sheet containing no lignin component were similarly used for the absorbent 220 including the absorbent core 221 and the absorbent 220.
  • the a value of the Lab color system was measured in the wing portion 218 that did not include.
  • Table 11 shows the experimental results.
  • a standard white plate was placed on a napkin as a sample, and a light beam was applied from below to measure the a value. This is because the wing portion 218 transmits light and prevents the measurement result from being different depending on the color on the back side of the napkin.
  • the liquid-absorbent core 221 does not contain a lignin component has been described.
  • the present invention is not limited to this, and the absorbent core 221 may include a lignin component.
  • FIG. 19 is a plan view of a sanitary napkin 210 according to the second embodiment of the second invention
  • FIG. 20A is a cross-sectional view similar to FIG. 15 in the second embodiment.
  • the basic configuration of the sanitary napkin 210 according to the present embodiment is the same as that of the first embodiment, and only the differences will be described below.
  • the sanitary napkin 210 includes a plurality of concave portions 260 that are concave from the top sheet 211 toward the back sheet 212 in the liquid absorbing layer 213, and a discontinuous portion surrounding the plurality of concave portions 260. And a compressed groove 270 extending annularly.
  • the concave portion 260 has a bottom and is located apart from each other in the vertical direction Y and the horizontal direction X in plan view.
  • the concave portion 260 has various known shapes such as a circular shape, an elliptical shape, a triangular shape, and a rectangular shape in addition to the illustrated embodiment.
  • the concave portion 260 can be formed by, for example, a pressure heating process. Specifically, in a known embossing process, it can be formed by compressing the absorber 220 together with the topsheet 211 by pressing embossing pins from the topsheet 211 side. Therefore, the thin portion 261 of the absorber 220 where the concave portion 260 is located has a higher fiber density than the thick portion 262 where the concave portion 260 located therearound is not located. Since the core cover sheet 222 has a plurality of high lignin regions 252, the diffusibility of the bodily fluid is relatively low, and there is a possibility that the bodily fluid cannot be diffused and absorbed in the entire absorbent core 221.
  • the bodily fluid can be retained directly in the concave portions 260, and can be passed through the topsheet 211 and the core cover sheet 222.
  • the surface area of the liquid-absorbent core 221 that indirectly comes into contact with blood is increased, and menstrual blood can be quickly absorbed and retained in the liquid-absorbent core 221 via the two sheets 211 and 222.
  • the thin portion 261 where the concave portion 260 is located has a higher fiber density than the thick portion 262, the body fluid accumulated in the concave portion 260 can be drawn down more quickly and absorbed and held.
  • FIG. 20B is a cross-sectional view similar to FIG. 20A in a modified example of the sanitary napkin 210 according to the second embodiment.
  • the concave portion 260 is formed from an opening penetrating the liquid absorbing layer 213 in the thickness direction Z. Since the liquid-impervious back sheet 212 is located on the bottom surface of the concave portion 260, the bodily fluid accumulated in the through-opening does not leak out, and is absorbed and held by the absorber 220 from the peripheral wall of the opening. You.
  • FIG. 21 shows an example of a usage example of the absorbent article according to the second invention.
  • the absorber 220 is used for a disposable diaper (absorbent article) 280.
  • the disposable diaper 280 is shown in a state in which side seams joining both side edges of the front and rear waist panels 284 and 285 are peeled off and extended in the horizontal and vertical directions.
  • the disposable diaper 280 has a front waist area 281, a rear waist area 282, and a crotch area 283 located between the front and rear waist areas 281 and 282. Also, the diaper 280 includes a front waist panel 284 defining a part of the front waist area 281 and the crotch area 283, a rear waist panel 285 defining a part of the rear waist area 282 and a part of the crotch area 283, and a front waist area.
  • a liquid absorbing structure 286 extending in the vertical direction on the skin-facing surface side of the panels 284, 285, and in a state in which both side edges of the front and rear waist panels 284, 285 are overlapped with each other, with a gap in the vertical direction.
  • a waist opening and a pair of leg openings are defined by being joined to each other via the plurality of seams arranged.
  • the absorber 220 extends from the crotch region 283 to the front and rear waist regions 281 and 282 in the liquid absorbing structure 286.
  • the diaper 280 is of a so-called pants type in which both side edges of the front and rear waist regions 281 and 282 are joined in advance.
  • the absorber 220 covers the absorbent core 221 and the absorbent core 221.
  • the core cover sheet 222 includes a peripheral region including a low lignin region 251 and a plurality of high lignin regions 252 scattered in the peripheral region.
  • the absorber 220 gives a natural product image using a natural material and is excellent in antibacterial properties by allowing the light brown color of the core cover sheet 222 to be seen through in the inside view and / or the outside view of the diaper 280. Fluid such as loose stool can be promptly transferred from the core cover sheet 222 to the absorbent core 221.
  • the absorbent article according to the present invention may be not only a pants-type diaper but also an open-type diaper.
  • a separate sheet having a bulky and excellent cushioning property may be disposed between the topsheet 211 and the core cover sheet 222. Since the separate sheet is bonded to the topsheet 211, it can be said that the separate sheet is substantially a part of the topsheet 211.
  • the core cover sheet 222 is formed of two fiber nonwoven fabric sheets, and a sheet including the above-described bleached pulp fiber 241 and unbleached pulp fiber 242 is used as the core cover sheet located on the skin-facing surface to form a non-skin-facing sheet.
  • a sheet containing only bleached pulp fibers 241 may be used as the core cover sheet located on the surface.
  • the absorber 220 is light brown when viewed from the skin-facing surface, and white when viewed from the non-skin-facing surface. Therefore, if the opening of the package having a plurality of napkins is formed on the non-skin-facing surface side, it is possible to give the user an impression that the article has a clean feeling. If formed on the facing surface side, it is possible to give a user the image that the article is a skin-friendly article using a natural material.
  • each component constituting the absorbent articles 210 and 280 includes, in addition to the materials described in this specification, various known materials commonly used in this type of field. Materials can be used without limitation. Further, the terms “first” and “second” used in the present specification and claims are used merely for distinguishing between similar elements, positions, and the like.
  • the following third embodiment of the present invention relates to the absorbent article shown in the attached drawings, and includes not only the essential configuration of the invention but also a selective and preferred configuration.
  • a sanitary napkin 310 as an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings.
  • the sanitary napkin 310 has a vertical direction Y, a horizontal direction X, and a thickness direction Z.
  • the sanitary napkin 310 has a vertical center line P bisecting the dimension in the width direction and a horizontal center line Q bisecting the length dimension.
  • the convex surface is curved at the center where the facing surface (inner surface) side and the non-skin facing surface (outer surface) side opposite thereto, the first and second end edges 310a and 310b, and the horizontal center line Q are located.
  • the topsheet 311 and the absorber 320 are joined to each other by a known joining means such as a hot melt adhesive, and the liquid absorbing layer 313 is formed.
  • a relatively bulky fiber nonwoven fabric intermediate sheet may be disposed between the topsheet 311 and the absorber 320. Further, between the absorber 320 and the back sheet 312, in order to suppress the leakage of bodily fluids, preferably a leak-proof sheet made of a liquid-impermeable fibrous nonwoven fabric or a plastic film having air permeability is arranged. Good.
  • the absorber 320 extends in the vertical direction between the first edge 320a facing the first edge 310a, the second edge 320b facing the second edge 310b, and the first and second edges 320a, 320b. It has first and second side edges 320c and 320d.
  • the front and back sheets 311, 312 extend outward from the outer periphery of the absorber 320, and a pair of side sheets extending in the vertical direction Y so as to face each other in the horizontal direction on the skin facing surface side of the top sheet 311. 314 are arranged.
  • the pair of side sheets 314 is joined to the top sheet 311 via a side joint (not shown) formed by a known bonding means or welding means.
  • an elastic material extending in the vertical direction Y may be arranged on the side sheet 314 so as to be contractible in an extended state in order to form a leak-proof wall that stands on the body side in a worn state.
  • the side joint portion for fixing the side sheet 314 may be a seal line having a design element such as a floral pattern or a geometric pattern and extending in the vertical direction Y.
  • the sanitary napkin 310 is formed by a top sheet 311, a back sheet 312, and a side sheet 314, and both ends extending in the horizontal direction X outside the first and second edges 320a, 320b of the absorber 320 in the vertical direction Y. 316 and both side edges 317 extending in the vertical direction Y outside the first and second side edges 320c and 320d of the absorber 320 in the horizontal direction X.
  • a wing portion 318 formed by a part of both side edge portions 317 is formed at a central portion in the vertical direction Y of the sanitary napkin 310 and protrudes outward in the horizontal direction X.
  • the sheets 311, 312, and 314 stacked on each other are joined to each other via an outer peripheral seal portion 319 located along the outer peripheral edge of the sanitary napkin 310.
  • a plurality of fastening areas 330 are arranged on the back side of the sanitary napkin 310.
  • the plurality of fastening areas 330 are for fastening the sanitary napkin 310 to clothing such as underwear, and are formed of a plurality of line-shaped adhesives or pressure-sensitive adhesives extending in the vertical direction Y. Is done.
  • the fastening region 330 has a central region 331 extending in the vertical direction Y in a region overlapping with the absorber 320, and a side region 332 located at the wing portion 318.
  • the fixing area 330 is covered with a plastic film separator (not shown).
  • the topsheet 311 can be formed from various liquid-permeable fibrous nonwoven fabrics, for example, an air-through fibrous nonwoven fabric having a mass of about 15 to 45 g / m 2 , a porous plastic film, or a laminate sheet thereof.
  • the back sheet 312 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable fibrous nonwoven fabric, a laminate sheet thereof, and the like.
  • As the side sheet 314, a sheet material similar to the top sheet 311 can be used. However, in order to effectively prevent lateral leakage of body fluid, it is preferable to use a sheet material having hydrophobicity or water repellency.
  • a sheet having an uneven surface on the front side may be used.
  • the surface of such a sheet is formed from a plurality of concave portions and a plurality of convex portions alternately arranged in the vertical direction Y or the horizontal direction X.
  • Examples of the method include a method of forming a low bulk portion and a high bulk portion by controlling the amount of fibers, a method of forming a concave portion by embossing / debossing, and a method of shaping into an uneven shape.
  • the fibers are arranged such that one of the protrusions and the recesses has a different fiber density, and one is sparse and the other is dense. While the sparsely arranged portion (first portion) is joined to the high lignin region 352 of the core cover sheet 322 described later, the joining strength is further increased, while the portion where the fibers are densely arranged (first portion). 2) and the low lignin region 351 are joined, so that the liquid absorbing property can be further improved.
  • a part of the concave portion of the topsheet 311 is substantially (continuously or discontinuously) surrounded by a compressed portion forming a compressed groove or a compressed concave portion formed by embossing. .
  • a compressed portion forming a compressed groove or a compressed concave portion formed by embossing.
  • embossing it is possible to prevent the body fluid accumulated in the concave portion from leaking in the horizontal direction X and the vertical direction Y.
  • the surface of the topsheet is uneven, the light brown core cover sheet 322 is seen darker than the protruding portions in the concave portions in the surface view, so that a decorative effect due to color gradation is generated. .
  • the outer peripheral seal portion 319 can be formed alone or in combination of bonding by known bonding means such as bonding with an adhesive, ultrasonic welding, heat welding, laser welding, and high-frequency welding, and embossing.
  • the sheets 311, 312, and 314 stacked in the thickness direction Z are joined to each other via an adhesive such as a hot melt adhesive.
  • an adhesive such as a hot melt adhesive.
  • the method for applying the hot melt adhesive include various known application methods such as spiral coating, coater coating, curtain coater coating, and spray coating.
  • an absorbent body 320 is made of a liquid-absorbent core 321 formed by mixing superabsorbent polymer particles (SAP) and cellulosic fibers such as fluff wood pulp and rayon fibers and shaping the mixture into a predetermined shape. And a liquid-permeable core cover sheet 322 that covers the entire liquid-absorbent core 321 in order to improve shape retention and liquid diffusion.
  • SAP superabsorbent polymer particles
  • cellulosic fibers such as fluff wood pulp and rayon fibers
  • the core cover sheet 322 has a dimension in the longitudinal direction Y that is larger than the dimension in the longitudinal direction Y of the liquid-absorbent core, and both side edges 322 a and 322 b of the core cover sheet 322 cover the entire liquid-absorbent core 321.
  • the liquid cores 321 are positioned so as to overlap with each other on the bottom surface side in the central portion in the lateral direction X of the liquid core 321.
  • a superimposed portion 323 formed by laminating the side edges 322a and 322b extending in the vertical direction Y is formed at the central portion in the horizontal direction X of the absorber 320. Is done.
  • the core cover sheet 322 has a first covering portion 325 that covers the skin-facing surface side of the liquid-absorbing core 321 and a second covering portion 326 that covers the non-skin-facing surface side of the liquid-absorbing core 321.
  • the core cover sheet 322 is formed from one continuous sheet.
  • the first core cover sheet forming the first covering portion 325 is separate from the first core cover sheet.
  • core cover sheet 322 is formed of various known fiber nonwoven fabrics or tissues, and is mainly composed of pulp fibers 340.
  • the pulp fibers 340 of the core cover sheet 322 include bleached pulp fibers 341 subjected to delignification treatment and unbleached pulp fibers 342 not subjected to delignification treatment.
  • the pulp fibers 340 include non-wood pulp fibers made from linter, manila hemp, kenaf, straw, bamboo, and banana, in addition to wood pulp fibers obtained from softwood or hardwood.
  • the core cover sheet 322 includes, for example, a first layer (upper layer or lower layer) made of a regenerated cellulose fiber such as rayon fiber or a hydrophilic fiber such as a semi-synthetic cellulose fiber, and an unbleached non-lignin-treated layer. It may have a multilayer structure composed of a second layer (lower or upper layer) made of pulp fibers 342. In such a case, as described later, even when the second layer has a sea-island structure including the low lignin region 351 and the high lignin region 352, the body fluid can be sufficiently diffused in the first layer. The unevenness of the diffusion of the bodily fluid in the entire core cover sheet 322 can be suppressed. Thereby, even after the body fluid has been absorbed a plurality of times, it is possible to suppress a decrease in the bonding property with the topsheet 311 and to maintain a suitable liquid absorbing property.
  • a first layer upper layer or lower layer
  • a regenerated cellulose fiber such as
  • the pulp fiber 340 is generally subjected to a raw chip processing step, and then to a cooking step (the first stage of delignification processing) in which a chemical is added to the raw chip and the mixture is boiled under high temperature and high pressure to digest lignin.
  • a cooking step the first stage of delignification processing
  • a chemical is added to the raw chip and the mixture is boiled under high temperature and high pressure to digest lignin.
  • an oxygen exposure process to decompose lignin remaining in the digestion process with oxygen (the second stage of delignification treatment)
  • a bleaching process to bleach the pulp using a plurality of chemicals.
  • the bleached pulp fiber 341 is obtained.
  • the unbleached pulp fiber 342 has been subjected to only a digestion step and a screen step, which are the first stage of delignification treatment, among these steps, and has been subjected to a certain degree of delignification treatment.
  • the unbleached pulp fiber 342 according to the present invention has a lignin content of 0.2 to 10.0%.
  • the lignin content of the unbleached pulp fiber 342 was measured by the following method.
  • ADF quantitative reagent acidic detergent solution ⁇ 10 g of cetyltrimethylammonium bromide (hexadecyltrimethylammonium bromide) dissolved in 500 mL of 1N sulfuric acid> Acetone Decahydronaphthalene as antifoam (optional) ⁇ Measurement procedure> A 300 g sample was weighed and placed in a 50 mL Erlenmeyer flask, and 30 mL of the acidic datagen and the solution were added. The flask was capped with aluminum foil, placed in boiling water in an Erlenmeyer flask, and disintegrated for 60 minutes.
  • the mixture was transferred to a gou-ttsuru crucible covered with glass fiber filter paper (GA-200), subjected to suction filtration, and the residue was washed with hot water and acetone. After air-drying, it was heat-dried.
  • the weight after drying is constant weight and after subtracting the ash content is ADF, the ash content after lignin quantification cannot be used for this.
  • Lignin quantitative reagent 72% sulfuric acid ⁇ Measurement procedure> After dripping a few drops of 72% sulfuric acid on the dried goo-tchi crucible to wet the whole, sulfuric acid of about twice the amount of ADF was added, and the mixture was allowed to stand for 3 to 4 hours while adding sulfuric acid appropriately every hour. Thereafter, the solution was filtered by suction, and washed with hot water until the filtrate no longer showed acidity. After air drying, heat dry to constant weight. The goochi crucible was ashed at 550 ° C, and the ash content was determined.
  • the first covering portion 325 of the core cover sheet 322 includes a low lignin region (lignin low content region) 351 having a relatively low lignin component content and a high lignin region having a higher lignin component content than the low lignin region 351. (High lignin content area) 352.
  • the low lignin region 351 is formed mainly of the bleached pulp fibers 341, and the high lignin region 352 is formed mainly of the unbleached pulp fibers 342.
  • the low lignin area 351 is a peripheral area relatively located in a wide range of the outer surface of the core cover sheet 322, whereas the high lignin area 352 is located. Are scattered with respect to the low lignin area 351.
  • the entire core cover sheet 322 or at least the first covering portion 325 has a sea-island structure in which the low lignin region 351 is the sea and the high lignin region 352 is the island.
  • the core cover sheet 322 has a plurality of high lignin regions 352, the core cover sheet 322 has a light brown color derived from plant materials such as wood as a whole. Since the other sheets 311, 312, and 314 other than the core cover sheet 322 have a white color as a whole by kneading a white pigment such as titanium dioxide into the constituent fibers, the core cover sheet 322 is made of a sanitary napkin 310. When viewed from the front and / or the back, the light can easily be seen through the other sheets 311, 312, and 314.
  • the core cover sheet 322 is formed by entanglement of a mixture of the bleached pulp fiber 341 and the unbleached pulp fiber 342 in a sheet-making process, and the low lignin region 351 is mainly Since the bleached pulp fiber 341 and the high lignin area 352 mainly include the unbleached pulp fiber 342, the boundary between the two areas 351 and 352 is unclear and cannot be clearly distinguished.
  • a method of forming the high lignin area 352 in the low lignin area 351 on the entire outer surface of the core cover sheet 322 in this manner for example, a mixing method and a mixing ratio of the pulp fibers 341 and 342 are used.
  • both regions 351 and 352 are formed by adjusting various conditions in the manufacturing process, unbleached pulp fiber 342 is included in a part of low lignin region 351 and bleached pulp fiber 341 is included in high lignin region 352. It can be said that there are times. Therefore, the low lignin region 351 and the high lignin region 352 are not formed only from the bleached pulp fibers 341 and the unbleached pulp fibers 342, respectively, and may include fibers other than the pulp fibers.
  • the content of the bleached pulp fiber 341 in the pulp fiber in the low lignin region 351 is 50 to 100%
  • the content of the unbleached pulp fiber 342 in the pulp fiber in the high lignin region 352 is 50 to 100%.
  • the high lignin region 352 is a region in which the content of the lignin component is higher than that of the low lignin region 351 which is a peripheral region in the core cover sheet 322. It can be formed without using.
  • a high lignin region 352 having a higher lignin component content than the peripheral region can be formed by infiltrating the liquid containing the lignin component into the nonwoven fabric sheet made of rayon fiber or synthetic fiber by scattering.
  • the core cover sheet 322 Since the core cover sheet 322 has a plurality of high lignin regions 352 mainly composed of the unbleached pulp fibers 342, the core cover sheet 322 is more plant-derived than in the case of using the core cover sheet composed only of the unbleached pulp fibers. It has a light brown color (wood color), and gives the wearer or wearer an image that the product is a skin-friendly product using a natural material. In addition, since the core cover sheet 322 has a light brown color, when excreted menstrual blood passes through the topsheet 311 and is absorbed and held by the absorber 320, redness of menstrual blood is suppressed.
  • the lignin component has an antibacterial action, it can be disposed of in a sanitary manner while suppressing the growth of various bacteria after use.
  • the content of the lignin component of the core cover sheet 322 is 0.2 to 10%. Is preferred. When the content of the lignin component of the core cover sheet 322 is less than 0.2%, the light brown color of the core cover sheet 322 is indistinguishable from the other sheets 311, 312, 314 having white color. There is a risk of becoming thin. On the other hand, when the content of the lignin component in the core cover sheet 322 exceeds 10%, the color of the lignin component becomes dark, which may impair the natural appearance of the natural material and the redness of menstrual blood. There is a possibility that the amount of menstrual blood may not be able to be accurately grasped due to difficulty in visual recognition.
  • the core cover sheet has a role of transferring the body fluid permeating the surface sheet to the liquid-absorbing core while absorbing and diffusing the body fluid transmitted through the surface sheet, in addition to the shape retention of the liquid-absorbing core. It is preferably used.
  • the unbleached pulp fiber 342 in the high lignin region 352 has a low degree of hydrophilicity due to containing a large amount of a lignin component and is relatively hydrophobic.
  • the entire first coating portion 325 is formed from the high lignin region 352. In this case, menstrual blood that has passed through the topsheet 311 cannot be absorbed and retained in the high lignin region 352, and menstrual blood cannot be transferred to the liquid-absorbent core 321 quickly.
  • the first covering portion 325 of the core cover sheet 322 has a low lignin area 351 and a plurality of high lignin areas 352 scattered around the low lignin area 351. 352 alternately appear in the horizontal direction X. Since the high lignin areas 352 are scattered in the low lignin areas 351, the low lignin areas 351 and the high lignin areas 352 are alternately arranged not only in the horizontal direction X but also in the vertical direction Y. It can be said that there is.
  • the low lignin region 351 and the high lignin region 352 are alternately located in the horizontal direction X and the vertical direction Y, so that menstrual blood transmitted through the topsheet 311 becomes hydrophilic.
  • the liquid can be promptly transferred to the liquid-absorbent core 321 to be absorbed and retained, and have a required absorption speed.
  • the bleached pulp fiber swells by absorbing menstrual blood, so that the bonded portion is separated at the bonded interface between the topsheet 311 and the core cover sheet 322 via the hot melt adhesive. As a result, the joining strength may be reduced.
  • the high lignin region 352 since the high lignin region 352 has lower hydrophilicity and hydrophobicity than the low lignin region 351, it absorbs menstrual blood and does not easily swell, and the joint does not peel off.
  • the bonding strength at the bonding interface with the topsheet 311 is higher than in the low lignin region 351.
  • the bonding strength between the core cover sheet 322 and the topsheet 311 is increased, and the bonding strength of the topsheet 311 from the absorber 320 during wearing is increased. Peeling and lifting can be suppressed.
  • the amount of the adhesive is increased to increase the bonding strength between the two sheets 311 and 322, the sheet rigidity may be increased and the flexibility and the liquid permeability may be reduced, but such disadvantages may occur. Absent.
  • the absorbent core 321 mainly includes SAP particles and bleached fluff pulp, and may optionally have cellulosic fibers, but does not include unbleached pulp fibers 342, and the core cover sheet 322 includes The lignin content is lower than that. Therefore, menstrual blood that has passed through the topsheet 311 and has been absorbed and diffused into the core cover sheet 322 is likely to be promptly transferred to the liquid-absorbent core 321 having a higher degree of hydrophilicity than the core cover sheet 322. Become.
  • the plurality of high lignin regions 352 are scattered in the low lignin region 351 in the core cover sheet 322, so that the core cover sheet 322 has a natural appearance, a menstrual concealing property, and antibacterial properties.
  • the core cover sheet 322 and the topsheet 311 have appropriate bonding strength and liquid absorbability.
  • the liquid-absorbent core 321 may be formed only of SAP particles.
  • the absorber 320 is composed of a liquid-absorbent core 321 composed of only SAP particles and a core cover sheet 322 that covers the core. Since the core cover sheet 322 has a low lignin area 351 and thus has a relatively low liquid holding property, the liquid absorbing core 321 is formed of only SAP particles having a high liquid absorbing capacity, so that the entire absorbent body 320 is formed. As a result, it can exhibit an appropriate liquid absorbing property.
  • the low lignin region 351 and the high lignin region 352 are formed by the bleached pulp fiber 341 and the unbleached pulp fiber 342, the shape of the boundary line between them is unclear, and at least in plan view. It has a wavy shape instead of a linear shape. Therefore, the required absorption area of the low lignin region 351 can be maintained per unit width (for example, 1.0 mm) near the boundary between the low lignin region 351 and the high lignin region 352.
  • an overlapping portion 323 formed by laminating both side edges 322 a and 322 b of the core cover sheet 322 is located at a central portion in the lateral direction X of the absorber 320. Since the overlapped portion 323 is a portion where the core cover sheet 322 is folded, the light brown color of the unbleached pulp fiber is visually recognized more densely than the other portion of the absorber 320, and extends in the vertical direction Y in appearance. It can be a design accent as a line. Further, the line extending in the vertical direction Y can be used as a mark indicating the central portion of the absorber 320 and used for positioning when the sanitary napkin 310 is attached to underwear or the like.
  • the hydrophobic high lignin area 352 is compared to the outside in the vertical direction Y of the both edges.
  • the formation index of the core cover sheet 322 is preferably 50 to 300. If the formation index of the core cover sheet 322 is less than 50, the pulp fibers are arranged densely and uniformly, so that the liquid permeability is reduced, and menstrual blood cannot be transferred to the liquid-absorbent core 321 quickly. On the other hand, when the formation index exceeds 300, extremely poor formation is formed, the tensile strength is reduced, and there is a possibility that a part may be broken during use.
  • the formation index of the core cover sheet 322 was measured using a formation tester FMT-MIII manufactured by Nomura Corporation.
  • the measurement area was 250 mm ⁇ 180 mm, the measurement time was 3 seconds / sample, the formation indices of both surfaces of the three samples were measured, and the average value was used as the measured value.
  • the formation index means that the smaller the measured value, the less the formation unevenness.
  • the unbleached pulp fiber 342 has higher rigidity than the bleached pulp fiber 341, when the core cover sheet is formed only of the unbleached pulp fiber 342, the flexibility is relatively low, and the surface sheet Although the core cover sheet cannot follow the movement of 311 and the core cover sheet may peel off from the top sheet 311, the high lignin area 352 is scattered in the low lignin area 351, so that the flexibility is not greatly impaired.
  • the core cover sheet 322 has a required flexibility, and specifically, the crepe ratio of the core cover sheet 322 is 7 to 20%.
  • the crepe rate of the core cover sheet 322 is less than 7%, the rigidity of the core cover sheet 322 becomes relatively high and cannot follow the movement of the topsheet 311. On the other hand, the crepe rate becomes 20%. If it exceeds, the core cover sheet 322 becomes too flexible, and the sheet may be broken during manufacturing or use.
  • the crepe rate of the core cover sheet 322 was measured by an underwater elongation method.
  • the measurement sample is prepared by cutting the core cover sheet 322 into 100 mm x 100 mm, and the measurement sample is immersed in water for 10 seconds, then pulled up, and the crepe ratio is calculated from the amount of change in dimension by the following formula.
  • Crepe ratio (%) ⁇ (dimension after immersion in water) / (dimension before immersion in water) ⁇ 1 ⁇ ⁇ 100
  • a hydrophilic sheet containing cotton fibers can be used for the top sheet 311.
  • the cushioning property, the touch property, and the liquid absorbing property are excellent.
  • the core cover sheet 322 has a relatively low liquid retention of constituent fibers, Since the sheet has high hygroscopicity, the moisture in the absorber 320 can be absorbed by the top sheet 311. Thereby, the generation of moisture between the sanitary napkin and the body can be suppressed, and the internal stuffiness can be suppressed.
  • the core cover sheet has a higher Krem water absorption than the top sheet 311 containing cotton fibers.
  • the core cover sheet 322 has a higher Krem water absorption than the topsheet 311 located on the skin-facing surface side, so that the core cover sheet 322 draws in menstrual blood absorbed and diffused in the topsheet 311. And the liquid can be promptly transferred to the liquid-absorbent core 321, and liquid residue on the topsheet 311 can be effectively suppressed.
  • the measurement of the Krem water absorption of the core cover sheet 322 was carried out in accordance with the Krem water absorption test (JIS-L1907, P8141).
  • a measuring instrument, a stopwatch, a plastic container and artificial urine (colored with blue No. 1) were used as measuring instruments.
  • artificial urine was placed in a plastic container until the depth of the artificial urine became 10 mm or more.
  • the collected test piece was fixed with a fixed chuck, and set so as to be immersed in artificial urine at a depth of 5 mm from the tip of the sample.
  • the liquid-absorbing core is promptly used because both have high liquid retention properties. Menstrual blood cannot be transferred.
  • the core cover sheet 322 has the high lignin area 352, so that the liquid holding property is lowered as a whole, and menstrual blood can be smoothly shifted downward.
  • the topsheet 311 may have a multilayer structure, in which case it is preferable that the layer (upper layer) located on the skin-facing surface side is substantially formed of cotton fibers. In such a case, the cotton fibers can more efficiently absorb moisture in a portion close to the skin.
  • the topsheet 311 has a multi-layer structure, in which the layer (upper layer) located on the side facing the skin is mainly made of cotton fibers, and the layer (lower layer) located on the side facing the non-skin is mainly made of hydrophobic synthetic resin fibers. , Respectively.
  • the topsheet 311 contains water-absorbing cotton fibers on the skin side
  • the clem water absorption of the topsheet 311 is lower than that of the core cover sheet 322. Since the Klemm water absorption of the topsheet 311 is lower than the Klem water absorption of the core cover sheet 322, the core cover sheet 322 closer to the absorber 320 than the sanitary napkin 310 does not diffuse bodily fluid on the surface thereof.
  • the body fluid can be diffused, and the body fluid absorbed by the absorber 320 can be prevented from returning to the surface side (rewet back).
  • the liquid-absorbent core 321 optionally has cellulose fibers including semi-synthetic cellulose fibers such as acetate and regenerated cellulose fibers such as rayon, in addition to cellulose fibers such as cotton and pulp fibers.
  • the core cover sheet 322 also has a high affinity since it has the cellulosic fiber composed of the bleached pulp fiber 341 and the unbleached pulp fiber 342, similarly to the liquid absorbent core 321, and has a high affinity in the compressed grooves and the like located at the outer periphery of the absorber. When the core cover sheet 322 and the liquid-absorbent core 321 are welded to each other, the joining strength is improved.
  • the liquid-absorbent core 321 may have a plurality of functional particles formed of activated carbon, zeolite, or the like and having a function of adsorbing odors of body fluids such as menstrual blood. Since the liquid-absorbent core 321 has an odor-adsorbing property, the sanitary napkin 310 can be used and disposed more sanitarily and cleanly in combination with the antibacterial property of the core cover sheet 322.
  • the absorbent 320 of the core cover sheet 322 is A plurality of high lignin regions 352 are scattered not only in the first covering portion 325 covering the skin facing surface side, but also in the second covering portion 326 covering the non-skin facing surface side of the absorber 320. Therefore, in the cross-sectional view shown in FIG. 24, the low lignin regions 351 and the high lignin regions 352 are alternately located in the horizontal direction X also in the second covering portion 326.
  • the high lignin area 352 has higher adhesive strength to the sheet than the low lignin area 351, the high lignin area 352 is bonded to the back sheet 312 as compared with the case where a normal core cover sheet having no high lignin area 352 is used. Excellent strength. Therefore, in order to increase the bonding strength, it is not necessary to increase the mass per unit area of the adhesive, and the increase in the adhesive increases the sheet rigidity and does not decrease the ability to follow the absorber 320.
  • FIG. 28 is a plan view of a sanitary napkin 310 according to the second embodiment of the third invention
  • FIG. 29A is a cross-sectional view similar to FIG. 24 in the second embodiment.
  • the basic configuration of the sanitary napkin 310 according to the present embodiment is the same as that of the first embodiment, and only the differences will be described below.
  • the sanitary napkin 310 includes a plurality of concave portions 360 that are concave from the top sheet 311 toward the back sheet 312 in the liquid absorbing layer 313, and a discontinuous portion surrounding the plurality of concave portions 360. And a compressed groove 370 extending annularly.
  • the concave portion 360 has a bottom and is located apart from each other in the vertical direction Y and the horizontal direction X in plan view.
  • the concave portion 360 has various known shapes such as a circular shape, an elliptical shape, a triangular shape, and a rectangular shape in addition to the illustrated embodiment.
  • the concave portion 360 can be formed by, for example, a pressure heating process. Specifically, in the known embossing, it can be formed by pressing the embossing pin from the top sheet 311 side to compress the absorber 320 together with the top sheet 311. Therefore, the thin portion 361 of the absorber 320 where the concave portion 360 is located has a higher fiber density than the thick portion 362 where the concave portion 360 located therearound is not located. Since the core cover sheet 322 has a plurality of high lignin regions 352, the diffusibility of bodily fluids is relatively low, and there is a possibility that the bodily fluids cannot be diffused and absorbed in the entire liquid absorbing core 321.
  • the plurality of concave portions 360 extending to the inside of the liquid-absorbent core 321
  • bodily fluids can be directly retained in the concave portions 360, and can be passed through the topsheet 311 and the core cover sheet 322.
  • the surface area of the liquid-absorbent core 321 that indirectly comes into contact with blood increases, and the liquid-absorbent core 321 can quickly absorb and hold menstrual blood via both sheets 311 and 322.
  • the thin portion 361 where the concave portion 360 is located has a higher fiber density than the thick portion 362, the body fluid accumulated in the concave portion 360 can be drawn down more quickly and absorbed and held.
  • FIG. 29B is a cross-sectional view similar to FIG. 29A in a modified example of the sanitary napkin 310 according to the second embodiment.
  • the concave portion 360 is formed from an opening penetrating the liquid absorbing layer 313 in the thickness direction Z. Since the liquid-impervious back sheet 312 is located on the bottom surface of the concave portion 360, the bodily fluid accumulated in the through-opening does not leak out and is absorbed and held by the absorber 320 from the peripheral wall of the opening. You.
  • FIG. 30 shows an example of a usage example of the absorbent article according to the third invention.
  • the absorber 320 is used for a disposable diaper (absorbent article) 380.
  • the disposable diaper 380 is shown in a state where the side seams joining both side edges of the front and rear waist panels 384 and 385 are peeled off and extended in the horizontal and vertical directions.
  • the disposable diaper 380 has a front waist region 381, a rear waist region 382, and a crotch region 383 located between the front and rear waist regions 381 and 382.
  • the disposable diaper 380 includes a front waist panel 384 defining a part of the front waist region 381 and the crotch region 383, a rear waist panel 385 defining a part of the rear waist region 382 and a part of the crotch region 383, and front and rear.
  • a liquid-absorbing structure 386 extending in the vertical direction on the skin-facing surface side of the waist panels 384 and 385, and in the state where both side edges of the front and rear waist panels 384 and 385 are overlapped with each other, there is an interval in the vertical direction.
  • the waist opening and the pair of leg openings are defined by being joined to each other through a plurality of seams arranged in a horizontal direction.
  • the absorber 320 extends from the crotch area 383 to the front and rear waist areas 381 and 382 in the liquid absorbing structure 386.
  • the disposable diaper 380 is a so-called pants type in which both side edges of the front and rear waist regions 381 and 382 are joined in advance.
  • the absorbent body 320 covers the absorbent core 321 and the absorbent core 321.
  • the core cover sheet 322 includes a peripheral region including a low lignin region 351 and a plurality of high lignin regions 352 scattered in the peripheral region.
  • the absorber 320 gives a natural product image using a natural material and is excellent in antibacterial properties by urging the light brown color of the core cover sheet 322 through the inner and / or outer views of the disposable diaper 380, and is excellent in urination. Body fluid such as stool and loose stool can be quickly transferred from the core cover sheet 322 to the absorbent core 321.
  • the absorbent article according to the present invention may be not only a pants-type diaper but also an open-type diaper.
  • a separate sheet having a bulky and excellent cushioning property may be disposed between the topsheet 311 and the core cover sheet 322. Since the separate sheet is joined to the topsheet 311, it can be said that the separate sheet is substantially a part of the topsheet 311.
  • each of the components constituting the absorbent articles 310 and 380 includes, in addition to the materials described in this specification, various known materials commonly used in this type of field. Materials can be used without limitation. Further, the terms “first” and “second” used in the present specification and claims are used merely for distinguishing between similar elements, positions, and the like.
  • the following fourth embodiment of the present invention relates to the absorbent article shown in the attached drawings, and includes not only the essential constitution of the invention but also selective and preferred constitutions.
  • a sanitary napkin 410 which is an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings.
  • the sanitary napkin 410 has a vertical direction Y, a horizontal direction X, and a thickness direction Z.
  • the sanitary napkin 410 has a vertical center line P bisecting the dimension in the width direction and a horizontal center line Q bisecting the dimension in the length dimension.
  • a convex portion is formed at the central portion where the facing surface (inner surface) 402 side and the non-skin facing surface (outer surface) 403 on the opposite side, the first and second end edges 410a and 410b, and the horizontal center line Q are located.
  • First and second side edges 410c and 410d that bend, a liquid-permeable top sheet 411 located on the skin-facing surface side, and a liquid-impermeable back sheet 412 located on the non-skin-facing surface side.
  • a liquid-absorbing absorber 420 located between the sheets 411 and 412.
  • the topsheet 411 and the absorber 420 are joined to each other by a known joining means such as a hot melt adhesive, and the liquid absorbing layer 413 is formed.
  • a relatively bulky fiber nonwoven fabric intermediate sheet may be disposed between the topsheet 411 and the absorbent body 420 in order to improve the flexibility of the sanitary napkin 410.
  • a leak-proof sheet made of a liquid-impermeable fibrous nonwoven fabric or a plastic film, which preferably has air permeability, is preferably arranged to suppress leakage of bodily fluids. Good.
  • the absorber 420 extends in the vertical direction between the first edge 420a facing the first edge 410a, the second edge 420b facing the second edge 410b, and the first and second edges 420a, 420b. It has first and second side edges 420c and 420d.
  • the front and back sheets 411 and 412 extend outward from the outer periphery of the absorber 420, and a pair of side sheets extending in the vertical direction Y so as to face each other in the horizontal direction on the skin facing surface side of the top sheet 411. 414 is arranged.
  • the pair of side sheets 414 are joined to the top sheet 411 via side joints (not shown).
  • an elastic material extending in the vertical direction Y may be disposed on the side sheet 414 so as to be contractible in an extended state in order to form a leak-proof wall that rises toward the body in a worn state.
  • the side joint portion for fixing the side sheet 414 may be a seal line having a design element such as a floral pattern or a geometric pattern and extending in the vertical direction Y.
  • the sanitary napkin 410 is formed by a top sheet 411, a back sheet 412, and a side sheet 414, and has both ends extending in the horizontal direction X outside the first and second edges 420 a and 420 b of the absorber 420 in the vertical direction Y. 416, and both side edges 417 extending in the vertical direction Y outside of the first and second side edges 420c and 420d of the absorber 420 in the horizontal direction X.
  • a wing portion 418 formed by a part of both side edges 417 that protrudes outward in the horizontal direction X is located at a central portion in the vertical direction Y of the sanitary napkin 410.
  • the sheets 411, 412, 414 stacked on each other are joined to each other via an outer peripheral seal portion 419 located along the outer peripheral edge of the sanitary napkin 410.
  • a plurality of fastening areas 430 are arranged on the back side of the sanitary napkin 410.
  • the plurality of fastening areas 430 are for fastening the sanitary napkin 410 to clothing such as underwear, and are formed of a plurality of line-shaped adhesives or pressure-sensitive adhesives extending in the vertical direction Y. Is done.
  • the fastening region 430 has a central region 431 extending in the vertical direction Y in a region overlapping with the absorber 420, and a side region 432 located at the wing portion 418.
  • the fixing area 430 is covered with a plastic film separator (not shown).
  • the topsheet 411 can be formed from various fibrous nonwoven fabrics having liquid permeability, for example, an air-through fibrous nonwoven fabric having a mass of about 15 to 45 g / m 2 , a porous plastic film, or a laminate sheet thereof.
  • the back sheet 412 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable fibrous nonwoven fabric, a laminate sheet thereof, and the like.
  • As the side sheet 414 a sheet material similar to the top sheet 411 can be used. However, in order to effectively prevent lateral leakage of body fluid, it is preferable to use a sheet material having hydrophobicity or water repellency.
  • a sheet having an uneven shape on the surface side can be used.
  • the surface of such a sheet is formed from a plurality of concave portions and a plurality of convex portions alternately arranged in the vertical direction Y or the horizontal direction X.
  • Examples of the method include a method of forming a low bulk portion and a high bulk portion by controlling the amount of fibers, a method of forming a concave portion by embossing / debossing, and a method of shaping into an uneven shape.
  • the fibers are arranged such that one of the protrusions and the recesses has a different fiber density, and one is sparse and the other is dense. While the sparsely arranged portion (first portion) is joined to the high lignin region 452 of the core cover sheet 422 described later, the joining strength is further increased, while the portion where the fibers are densely arranged (first portion). 2) and the low lignin region 451 are joined, so that the liquid absorbing property can be further improved.
  • a part of the concave portion of the topsheet 411 is substantially (continuously or discontinuously) surrounded by a compressed portion forming a compressed groove or a compressed concave portion formed by embossing. .
  • the body fluid accumulated in the concave portion from leaking in the horizontal direction X and the vertical direction Y.
  • the light brown core cover sheet 422 is seen darker in the recesses than in the projections in the surface view, so that a decorative effect due to color gradation occurs. .
  • the outer peripheral seal portion 419 can be formed alone or in combination of bonding by known bonding means such as bonding with an adhesive, ultrasonic welding, heat welding, laser welding, and high frequency welding, and embossing.
  • the sheets 411, 412, and 414 stacked in the thickness direction Z are joined to each other via an adhesive such as a hot melt adhesive.
  • an adhesive such as a hot melt adhesive.
  • the method for applying the hot melt adhesive include various known application methods such as spiral coating, coater coating, curtain coater coating, and spray coating.
  • an absorbent body 420 is made of a liquid-absorbent core 421 formed by mixing superabsorbent polymer particles (SAP) and cellulosic fibers such as fluff wood pulp and rayon fibers and shaping the mixture into a predetermined shape. And a liquid-permeable core cover sheet 422 that covers the entire liquid-absorbent core 421 in order to improve shape retention and liquid diffusion.
  • SAP superabsorbent polymer particles
  • cellulosic fibers such as fluff wood pulp and rayon fibers
  • the core cover sheet 422 has a dimension in the longitudinal direction Y that is larger than the dimension in the longitudinal direction Y of the liquid-absorbent core.
  • the liquid cores 421 are located so as to overlap with each other on the bottom surface side in the central portion in the lateral direction X.
  • an overlap portion 423 formed by laminating the side edges 422a and 422b extending in the vertical direction is formed at the central portion in the horizontal direction X of the absorber 420.
  • the core cover sheet 422 has a first covering portion 425 that covers the skin-facing surface side of the liquid-absorbing core 421, and a second covering portion 426 that covers the non-skin-facing surface side of the liquid-absorbing core 421.
  • the core cover sheet 422 is formed from one continuous sheet.
  • the first core cover sheet forming the first covering portion 425 is separate from the first core cover sheet.
  • a second core cover sheet forming the second covering portion 426 is forming the second covering portion 426.
  • the core cover sheet 422 is formed from various known fiber nonwoven fabrics or tissues, and is mainly composed of pulp fibers.
  • the pulp fibers of the core cover sheet 422 include bleached pulp fibers that have been subjected to delignification treatment and unbleached pulp fibers that have not been subjected to delignification treatment.
  • the pulp fibers include non-wood pulp fibers made of linter, manila hemp, kenaf, straw, bamboo, and banana, in addition to wood pulp fibers obtained from softwood or hardwood.
  • the core cover sheet 422 includes, for example, a first layer (upper layer or lower layer) made of a regenerated cellulose fiber such as rayon fiber or a hydrophilic fiber such as semi-synthetic cellulose fiber, and an unbleached material that has not been subjected to delignification treatment. It may have a multilayer structure composed of a second layer (lower or upper layer) made of pulp fibers 442. In such a case, as described later, even when the second layer has a sea-island structure including a low lignin region 451 and a high lignin region 452 described later, the body fluid can be sufficiently diffused in the first layer. Therefore, unevenness of the diffusion of the bodily fluid in the entire core cover sheet 422 can be suppressed. Thereby, even after the body fluid has been absorbed a plurality of times, it is possible to suppress a decrease in the bonding property with the topsheet 411 and to maintain a suitable liquid absorbing property.
  • a first layer upper layer or lower layer
  • the core cover sheet 422 Since the core cover sheet 422 has unbleached pulp fibers, it has a light brown color (wood color) derived from plant materials such as wood as a whole. Since the other sheets 411, 412, and 414 other than the core cover sheet have a white color as a whole by kneading a white pigment such as titanium dioxide into the constituent fibers, the core cover sheet 422 is formed of the sanitary napkin 410. When viewed from the front surface and / or the back surface, the light is transmitted through the other sheets 411, 412, and 414 and is easily recognized.
  • pulp fiber is subjected to a raw chip processing step, and then to a cooking step (first stage of delignification processing) in which a lignin is digested by adding a chemical to the raw chip and boiling under high temperature and high pressure.
  • a screen process for removing foreign matter By passing through a screen process for removing foreign matter, an oxygen exposure process for decomposing lignin remaining in the digestion process with oxygen (second stage of delignification process), and a bleaching process for bleaching pulp using a plurality of chemicals, It becomes bleached pulp fiber.
  • the unbleached pulp fiber has been subjected to only the digestion step and the screen step, which are the first stage of the delignification treatment, among these steps, and has been subjected to a certain degree of delignification treatment.
  • the unbleached pulp fiber contained in the core cover sheet 422 has a lignin content of 0.2 to 10.0%.
  • ⁇ Lignin content with unbleached pulp fiber was measured by the following method.
  • ADF quantitative reagent Acid detergent solution A solution obtained by dissolving 10 g of cetyltrimethylammonium bromide (hexadecyltrimethylammonium bromide) in 500 mL of 1N sulfuric acid. Acetone Decahydronaphthalene as antifoam (optional) ⁇ Measurement procedure> A 300 g sample was weighed and placed in a 50 mL Erlenmeyer flask, and 30 mL of the acidic datagen and the solution were added. The flask was capped with aluminum foil, placed in boiling water in an Erlenmeyer flask, and disintegrated for 60 minutes.
  • the mixture was transferred to a gou-ttsuru crucible covered with glass fiber filter paper (GA-200), subjected to suction filtration, and the residue was washed with hot water and acetone. After air-drying, it was heat-dried.
  • the weight after drying is constant weight and after subtracting the ash content is ADF, the ash content after lignin quantification cannot be used for this.
  • Lignin quantitative reagent 72% sulfuric acid ⁇ Measurement procedure> After dripping a few drops of 72% sulfuric acid on the dried goo-tchi crucible to wet the whole, sulfuric acid of about twice the amount of ADF was added, and the mixture was allowed to stand for 3 to 4 hours while adding sulfuric acid appropriately every hour. Thereafter, the solution was filtered by suction, and washed with hot water until the filtrate no longer showed acidity. After air drying, heat dry to constant weight. The goochi crucible was ashed at 550 ° C, and the ash content was determined.
  • the core cover sheet 422 Since the core cover sheet 422 has unbleached pulp fibers, the core cover sheet 422 has a light brown color derived from plant raw materials in surface view, compared to a case where a core cover sheet made of only bleached pulp fibers is used, and The assistant can be given the image of a skin-friendly product using natural materials. Further, since the core cover sheet 422 has a light brown color, when excreted menstrual blood passes through the topsheet 411 and is absorbed and held by the absorber 420, redness of menstrual blood is suppressed. Thereby, it is possible to suppress disgust caused by directly recognizing menstrual blood, and to alleviate mental anxiety caused by visually recognizing the redness of menstrual blood, for example, for a wearer at the beginning of menstruation. . In addition, since the lignin component has an antibacterial action, it can be disposed of in a sanitary manner while suppressing the growth of various bacteria after use.
  • the content of the lignin component of the core cover sheet 422 is preferably 2 to 10%. preferable.
  • the content of the lignin component of the core cover sheet 422 is less than 2%, the light brown color of the core cover sheet 422 becomes thin enough to be visually indistinguishable from the other sheets 411, 412, 414 having white. There is a risk.
  • the content of the lignin component in the core cover sheet 422 exceeds 10%, the color of the lignin component may be increased, and the natural appearance of the natural material may be impaired. There is a possibility that the amount of menstrual blood may not be able to be accurately grasped due to difficulty in visual recognition.
  • the liquid absorbing layer 413 is located between the first and second end areas 413A and 413B opposed to each other in the vertical direction Y, and the first and second end areas 413A and 413B. And an intermediate region 413C.
  • the liquid absorbing layer 413 further includes a plurality of concave portions 460 that are concave from the top sheet 411 toward the back sheet 412, and a compressed groove 470 that extends discontinuously and annularly so as to surround the plurality of concave portions 460. Have.
  • the compressed groove 470 includes a curved first outer groove 471 located in the first end area 413A, a curved second outer groove 472 located in the second end area 413B, and a first outer groove 471.
  • the concave portion 460 has a bottom and continuously extends from the topsheet 411 to a part of the liquid-absorbent core 421, and is located apart from each other in the vertical direction Y and the horizontal direction X in plan view. I have.
  • the concave portion 460 includes a first concave portion 460a located in a region surrounded by the first and second inner groove grooves 474, 475 and the third outer groove groove 473, a first outer groove groove 471, and a first inner groove.
  • a second concave portion 460b disposed in a region surrounded by the ridge groove 474, and a third concave portion 460c disposed in a region surrounded by the second outer ridge groove 472 and the second inner groove 475.
  • the first concave portion 460a has a substantially circular shape, whereas the second and third concave portions 460b and 460c have a substantially cross shape unlike the first concave portion 460a.
  • the first concave portion 460a is arranged more densely than the second and third concave portions 460b and 460c.
  • the concave portion 460 may have various known shapes such as a circular shape, an elliptical shape, a triangular shape, and a rectangular shape in addition to the illustrated embodiment.
  • the diameter is 1.0 to 1.5 mm
  • the pitch in the horizontal direction X is 3.0 to 5.0 mm
  • the pitch in the vertical direction Y is The pitch is between 5.0 and 7.0 mm.
  • the pitch means a distance between the center points of the first concave portions 460a.
  • the plurality of concave portions 460 in the liquid absorbing layer 413, it is possible to suppress the deformation and deformation of the absorber 420 during wearing.
  • the region where the first concave portion 460a is arranged is a portion of the absorber 420 facing the excretion opening of the wearer that is thicker than other regions, the first concave portion 460a is arranged. Thereby, the rigidity can be increased, and the warping and deformation during wearing can be effectively prevented.
  • the compressed groove 470 extending in the vertical direction Y in the entire region of the absorber 420, the body fluid can be quickly diffused through the compressed groove 470, and the absorber 420 can be attached to the body. It can be deformed into a curved shape as a whole along the shape.
  • the concave portion 460 of the liquid absorbing layer 413 can be formed by, for example, a pressure and heat treatment. Specifically, in a known embossing process, it can be formed by compressing the absorber 420 together with the topsheet 411 by pressing heated embossing pin from the topsheet 411 side of the liquid absorbing layer 413.
  • the core cover sheet has a role of absorbing and diffusing body fluid permeating the surface sheet and transferring to the liquid-absorbing core in addition to retaining the shape of the liquid-absorbing core.
  • the unbleached pulp fibers contained in the core cover sheet 422 according to the present embodiment have a low degree of hydrophilicity due to the high content of the lignin component and are hydrophobic, and menstrual blood that has passed through the topsheet 411 is used. Cannot be sufficiently absorbed and retained, and cannot be promptly transferred to the liquid-absorbent core 421.
  • menstrual blood can be directly retained in the concave portion 460 by having the plurality of concave portions 460 extending to the inside of the liquid-absorbent core 421, and the menstrual blood can be directly retained in the concave portion 460, via the topsheet 411 and the core cover sheet 422.
  • the surface area of the liquid-absorbent core 421 that indirectly comes into contact with menstrual blood is increased, and the liquid-absorbent core 421 can quickly absorb and hold body fluid via both sheets 411 and 422.
  • the core cover sheet 422 has unbleached pulp fibers and has a lower diffusivity than a core cover sheet made of a normal tissue, menstrual blood entering the concave portion 460 is not diffused, and Since it is held by the bottom and the peripheral wall of the 460, the body fluid can be spot-absorbed in the arrangement portion of the plurality of concave portions 460. Therefore, it is possible to prevent the body fluid from being diffused to both side edges of the liquid-absorbent core 421 and from passing through the side sheet 414 to adhere menstrual blood to the body.
  • the bleached pulp fibers may absorb menstrual blood and swell, and the bonding portion may peel off to lower the bonding strength. is there.
  • the unbleached pulp fiber has lower hydrophilicity and hydrophobicity than the bleached pulp fiber 441, so that it does not easily absorb menstrual blood and swell, and the joint does not peel off. Therefore, in the core cover sheet 422, the bleached pulp fiber and the unbleached pulp fiber are mixed, so that peeling and lifting of the topsheet 411 during wearing can be suppressed.
  • the sheet rigidity may increase and the flexibility and liquid permeability may decrease. It can be said that by adjusting the value, the joining strength can be controlled without such disadvantages.
  • the second covering portion 426 of the core cover sheet 422 is joined to the back sheet 412 via a hot melt adhesive. Since the core cover sheet 422 contains unbleached pulp fibers, the back sheet 412 and the core cover sheet 422 are joined via a hot melt adhesive as compared with a core cover sheet made of only bleached pulp fibers. It is hard to peel off at the interface and has the required bonding strength. Therefore, it is not necessary to increase the mass of the hot-melt adhesive in order to prevent the sheet from peeling, and the rigidity of the sheet is increased by increasing the mass of the hot-melt adhesive, and the followability to the absorber 420 is reduced. None to do.
  • the first covering portion 425 and the top sheet 411 of the core cover sheet 422, and the second covering portion 426 and the back sheet 412 are respectively bonded to each other via a rubber-based adhesive, for example, a SIS-based hot melt adhesive.
  • a rubber-based adhesive for example, a SIS-based hot melt adhesive.
  • the volatile organic compound (VOC) value can be reduced as compared with an EVA resin-based adhesive or the like using an organic solvent. It is more gentle on the skin and can be used safely.
  • the thin portion (bottom portion of the concave portion 460) 461 of the absorber 420 where the concave portion 460 is located has a higher density than the thick portion 462 where the concave portion 460 is not located. . Since the density of the thin portion 461 where the concave portion 460 is located is high, menstrual blood that has entered the concave portion 460 is quickly absorbed and diffused by the thin portion 461.
  • the formation index of the core cover sheet 422 is preferably 50 to 300. If the formation index of the core cover sheet 422 is less than 50, the pulp fibers are arranged densely and uniformly, so that the liquid permeability decreases, and menstrual blood cannot be transferred to the liquid-absorbent core 421 immediately. On the other hand, when the formation index exceeds 300, extremely poor formation is formed, the tensile strength is reduced, and there is a possibility that a part may be broken during use.
  • the formation index of the core cover sheet 422 was measured using a formation tester FMT-MIII manufactured by Nomura Corporation.
  • the measurement area was 250 mm ⁇ 180 mm, the measurement time was 3 seconds / sample, the formation indices of both surfaces of the three samples were measured, and the average value was used as the measured value.
  • the formation index means that the smaller the measured value, the less the formation unevenness.
  • the core cover sheet 422 Since the unbleached pulp fibers have higher rigidity than the bleached pulp fibers, when the core cover sheet 422 is formed only of the unbleached pulp fibers, the flexibility becomes relatively low, and Although the core cover sheet cannot follow the movement and may peel off from the topsheet 411, the flexibility is not greatly impaired by including the bleached pulp fiber. Therefore, the core cover sheet 422 has a required flexibility. Specifically, the crepe ratio of the core cover sheet 422 is 7 to 20%. If the crepe ratio of the core cover sheet 422 is less than 7%, the rigidity of the core cover sheet 422 becomes relatively high, and the core cover sheet 422 cannot follow the movement of the topsheet 411. On the other hand, when the crepe ratio exceeds 20%, the core cover sheet 422 becomes too flexible, and the sheet may be broken during production or use.
  • the crepe rate of the core cover sheet 422 was measured by an underwater elongation method.
  • the core cover sheet 422 is cut into 100 mm ⁇ 100 mm to prepare a measurement sample, the measurement sample is immersed in water for 10 seconds, then pulled up, and the crepe ratio is calculated from the amount of change in dimensions by the following equation.
  • Crepe ratio (%) ⁇ (dimension after immersion in water) / (dimension before immersion in water) ⁇ 1 ⁇ ⁇ 100
  • a hydrophilic sheet containing cotton fibers can be used for the top sheet 411.
  • the cushioning property, the touch property, and the liquid absorbing property are excellent.
  • the core cover sheet 422 has relatively low liquid retention of constituent fibers, Since the sheet has high hygroscopicity, the moisture in the absorber 420 can be absorbed by the top sheet 411. Thereby, the generation of moisture between the sanitary napkin and the body can be suppressed, and the internal stuffiness can be suppressed.
  • the core cover sheet 422 preferably has a higher Krem water absorption than the top sheet 411 containing cotton fibers. Since the Clem water absorption of the core cover sheet 422 is higher than the Krem water absorption of the topsheet 411 located on the skin facing surface side, the core cover sheet 422 draws menstrual blood absorbed and diffused in the topsheet 411. And the liquid can be promptly transferred to the liquid-absorbent core 421, and liquid residue on the topsheet 411 can be effectively suppressed.
  • the measurement of the Klemm water absorption of the core cover sheet 422 was performed in accordance with the Krem water absorption test (JIS-L1907, P8141).
  • a measuring instrument, a stopwatch, a plastic container and artificial urine (colored with blue No. 1) were used as measuring instruments.
  • artificial urine was placed in a plastic container until the depth of the artificial urine became 10 mm or more.
  • the collected test piece was fixed with a fixed chuck, and set so as to be immersed in artificial urine at a depth of 5 mm from the tip of the sample.
  • the topsheet 411 may have a multilayer structure, in which case it is preferable that the layer (upper layer) located on the skin-facing surface side is substantially formed of cotton fibers. In such a case, the cotton fibers can more efficiently absorb moisture in a portion close to the skin.
  • the topsheet 411 has a multi-layer structure, in which a layer (upper layer) located on the side facing the skin is mainly made of cotton fibers, and a layer (lower layer) located on the side facing the non-skin is mainly made of hydrophobic synthetic resin fibers. , Respectively.
  • the topsheet 411 contains water-absorbing cotton fibers on the skin side
  • the topsheet 411 has a lower Krem water absorption than the core cover sheet 422. Since the Klem water absorbency of the topsheet 411 is lower than the Klem water absorbency of the core cover sheet 422, the core cover sheet 422 closer to the absorber 420 without diffusing body fluid on the surface of the sanitary napkin 410. The body fluid can be diffused, and the body fluid absorbed by the absorber 420 can be prevented from returning to the surface side (rewet back).
  • the liquid-absorbent core 421 has, as an option, a cellulose fiber including a semi-synthetic cellulose fiber such as acetate and a regenerated cellulose fiber such as rayon in addition to cellulose fibers such as cotton and pulp fibers.
  • the core cover sheet 422 also has a high affinity because it has a cellulosic fiber composed of bleached pulp fiber and unbleached pulp fiber similarly to the liquid absorbent core 421, and has a high liquid absorbing property with the core cover sheet 422 in the compressed groove 470.
  • the liquid absorbing core 421 may be formed only of the SAP particles.
  • the absorber 420 is composed of a liquid-absorbent core 421 composed of only SAP particles and a core cover sheet 422 that covers the core.
  • the core cover sheet 422 has a low lignin region 451 described later, the liquid holding property is relatively low, while the liquid absorbing core 421 is formed only of SAP particles having a high liquid absorbing capacity. This allows the absorber 420 as a whole to exhibit appropriate liquid absorbing properties.
  • the liquid-absorbent core 421 may have a plurality of functional particles formed of activated carbon, zeolite, or the like and having a function of absorbing odor of body fluids such as menstrual blood. Since the liquid-absorbent core 421 has an odor-adsorbing property, the sanitary napkin 410 can be used and disposed more sanitarily and cleanly in combination with the antibacterial property of the core cover sheet 422.
  • an overlapping portion 423 formed by laminating both side edges 422 a and 422 b of the core cover sheet 422 is located at the central portion in the lateral direction X of the absorber 420. Since the overlapping portion 423 is a portion where the core cover sheet 422 is folded, the light brown color of the unbleached pulp fiber is visually recognized as being darker than other portions of the absorber 420, and extends in the vertical direction Y in external appearance. It can be a design accent as a line. Further, the line extending in the vertical direction Y can be used as a mark indicating the central portion of the absorber 420 and used for positioning when the sanitary napkin 410 is attached to underwear or the like.
  • FIG. 35 is a cross-sectional view similar to FIG. 34 in an example of a modification of the absorber 420.
  • a plurality of concave portions 460 formed in the liquid absorbing layer 413 are formed from openings passing through the topsheet 411 and the absorber 420.
  • Such an opening can be formed by hollowing out the entire thickness dimension of the liquid absorbing layer 413. Since the liquid-impervious back sheet 412 is located on the bottom surface of the concave portion 460, the bodily fluid accumulated on the bottom surface does not leak out, and is absorbed and held by the absorber 420 from the peripheral wall of the opening. .
  • FIG. 36 is a plan view of an absorbent body 420 of a sanitary napkin 410 according to the second embodiment of the fourth invention
  • FIG. 37 is a partially enlarged view of a region surrounded by a line XXXVII in FIG. 36
  • FIG. 35 is a sectional view similar to FIG. 34 of the sanitary napkin according to the second embodiment.
  • the first covering portion 425 of the core cover sheet 422 includes a low lignin region (lignin low content region) 451 having a relatively low lignin component content, and a lignin component content higher than the low lignin region 451.
  • the low lignin region 451 is mainly formed by aggregating bleached pulp fibers 441, and the high lignin region 452 is mainly formed by aggregating unbleached pulp fibers 442.
  • the low lignin area 451 is a peripheral area relatively located in a wide range on the outer surface of the core cover sheet 422, whereas the high lignin area 452 is located. Are scattered with respect to the low lignin area 451.
  • the first covering portion 425 of the core cover sheet 422 has a sea-island structure in which the low lignin region 451 is the sea and the high lignin region 452 is an island.
  • the core cover sheet 422 is formed by entangling a mixture of the bleached pulp fibers 441 and the unbleached pulp fibers 442 in a paper-making process into a sheet shape, and the low lignin region 451 is mainly Since the bleached pulp fiber 441 and the high lignin region 452 mainly include the unbleached pulp fiber 442, the boundary between the two regions 451 and 452 is unclear and cannot be clearly distinguished.
  • a method of forming the high lignin region 452 in the low lignin region 451 on the entire outer surface of the core cover sheet 422 in this manner for example, a mixing method and a mixing ratio of the pulp fibers 441 and 442 may be used.
  • unbleached pulp fiber 442 is contained in a part of low lignin region 451 and bleached pulp fiber 441 is contained in high lignin region 452. It can be said that there are times. Therefore, the low lignin region 451 and the high lignin region 452 are not formed only from the bleached pulp fibers 441 and the unbleached pulp fibers 442, respectively, and may include fibers other than pulp fibers.
  • the content of the bleached pulp fiber 441 in the pulp fiber of the low lignin region 451 is 50 to 100%
  • the content of the unbleached pulp fiber 442 in the pulp fiber of the high lignin region 452 is 50 to 100%.
  • the high lignin region 452 means a region where the content of the lignin component is higher than the low lignin region 451 which is a peripheral region in the core cover sheet 422. Therefore, the bleached pulp fiber 441 and the unbleached pulp fiber 442 are not used. Can also be formed.
  • a high lignin region 452 having a higher content of the lignin component than the surrounding region can be formed by infiltrating the liquid containing the lignin component into the fibrous nonwoven fabric sheet made of rayon fiber or synthetic fiber.
  • the first covering portion 425 of the core cover sheet 422 has a low lignin region 451 and a plurality of high lignin regions 452 scattered around the first lignin region 451. 452 alternately appear in the horizontal direction X. Since the high lignin areas 452 are scattered in the low lignin area 451, the low lignin areas 451 and the high lignin areas 452 are alternately arranged not only in the horizontal direction X but also in the vertical direction Y. It can be said that there is.
  • the low lignin region 451 and the high lignin region 452 are alternately positioned in the horizontal direction X and the vertical direction Y, so that menstrual blood transmitted through the topsheet 411 is hydrophilic.
  • the low lignin region 451 and quickly migrates to the liquid-absorbent core 421 to be absorbed and retained, and has a required absorption rate.
  • the low lignin region 451 and the high lignin region 452 are formed by the bleached pulp fiber 441 and the unbleached pulp fiber 442, the shape of the boundary line between them is unclear, and at least in plan view. It has a meandering wavy shape instead of a straight shape. Therefore, a required absorption area can be maintained per unit width (for example, 1.0 mm) near the boundary between the low lignin region 451 and the high lignin region 452.
  • FIG. 39 is a plan view of an absorbent article according to the third embodiment of the fourth invention, in which an absorbent body 420 is used for a disposable diaper (absorbent article) 480.
  • the disposable diaper 480 is shown in a state where the side seams joining the side edges of the front and rear waist panels 484 and 485 are peeled off and extended in the horizontal and vertical directions.
  • the disposable diaper 480 has a front waist region 481, a rear waist region 482, and a crotch region 483 located between the front and rear waist regions 481 and 482.
  • the diaper 480 includes a front waist panel 484 defining a part of the front waist area 481 and the crotch area 483, a rear waist panel 485 defining a part of the rear waist area 482 and a part of the crotch area 483, and a front waist area.
  • a liquid absorbing structure 486 extending in the vertical direction on the skin-facing surface side of the panels 484 and 485, and in a state in which both side edges of the front and rear waist panels 484 and 485 are overlapped with each other, a gap is provided in the vertical direction.
  • a waist opening and a pair of leg openings are defined by being joined to each other via the plurality of seams arranged.
  • the absorber 420 extends from the crotch region 483 to the front and rear waist regions 481 and 482 in the liquid absorbing structure 486.
  • the diaper 480 is a so-called pants type in which both side edges of the front and rear waist regions 481 and 482 are joined in advance, and like the sanitary napkin 410, the absorbent body 420 covers the absorbent core 421 and the absorbent core 421.
  • the core cover sheet 422 includes unbleached pulp fibers 442, and the liquid absorbing layer 413 has a plurality of concave portions 460 formed therein.
  • Absorbent body 420 gives a natural product image using a natural material and is excellent in antibacterial properties by urinating urine while light brown color of core cover sheet 422 is seen through inside and / or outside view of diaper 480.
  • Body fluid such as stool and loose stool can be promptly transferred from the core cover sheet 422 to the absorbent core 421 via the plurality of concave portions 460.
  • the absorbent article according to the present invention may be not only a pants-type diaper but also an open-type diaper.
  • a separate sheet having a bulky and excellent cushioning property may be disposed between the topsheet 411 and the core cover sheet 422. Since the separate sheet is joined to the topsheet 411, it can be said that the separate sheet is substantially a part of the topsheet 411.
  • each component constituting the absorbent articles 410 and 480 includes, in addition to the materials described in this specification, various known materials commonly used in this type of field. Materials can be used without limitation. Further, the terms “first” and “second” used in the present specification and claims are used merely for distinguishing between similar elements, positions, and the like.
  • Disposable diapers 121 Liquid absorbent core 121d Narrow area 122a First core cover sheet (core cover sheet) 122c Both edge portions 122d Both edge portions 122b Second core cover sheet (core cover sheet) 122e Both side edges 122f Both side edges 127 Joining portion 131 Top sheet 131a Top sheet 132 Back sheet 139 Intermediate sheet (separate member) 141 bleached pulp fiber 142 unbleached pulp fiber 161 convex part 162 concave part 171 indicator 180 disposable napkin (absorbent article) L1 Length dimension W1 of joint portion W1 lateral dimension of one side edge of both side edges W2 lateral dimension of the other side edge of both side edges W4 lateral dimension X of absorber Horizontal direction Y Vertical direction Z Thickness direction 210 Sanitary napkin (absorbent article) 211 Top sheet 212 Back sheet 220 Absorbent 221 Absorbent core 222 Core cover sheet 225 First covering section 226 Second covering section 240

Landscapes

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

Abstract

L'invention concerne un article absorbant avec lequel il est possible de réduire au minimum les substances chimiques utilisées dans l'article absorbant, et d'empêcher une tierce personne d'excréter de manière erronée. Une couche jetable (101) qui est un article absorbant comprend : une feuille de surface perméable aux liquides (131) positionnée sur un côté tourné vers la peau; une feuille de surface arrière imperméable aux liquides positionnée sur un côté non tourné vers la peau; et un matériau absorbant (120) positionné entre la feuille de surface et la feuille de surface arrière (132). Le matériau absorbant (120) comprend un noyau absorbant les liquides (121) et une feuille de couverture de noyau (122) recouvrant le noyau absorbant les liquides (121). La feuille de couverture de noyau (122) comprend : une première feuille de couverture de noyau (122a) qui recouvre au moins une partie du côté tourné vers la peau du noyau absorbant les liquides (121) et comprend une première fibre de pâte; et une seconde feuille de couverture de noyau (122b) qui recouvre au moins une partie du côté non tourné vers la peau du noyau absorbant les liquides (121) et comprend une seconde fibre de pâte. La seconde fibre de pâte a une valeur de Kappa inférieure à une valeur de Kappa de la première fibre de pâte.
PCT/JP2019/025912 2018-06-29 2019-06-28 Article absorbant WO2020004645A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020217030534A KR102560789B1 (ko) 2018-06-29 2019-06-28 흡수성 물품
CN201980043799.3A CN112334111B (zh) 2018-06-29 2019-06-28 吸收性物品
CN202210275863.4A CN114748249B (zh) 2018-06-29 2019-06-28 吸收性物品
CN202210275862.XA CN114748248B (zh) 2018-06-29 2019-06-28 吸收性物品
KR1020207003086A KR102381597B1 (ko) 2018-06-29 2019-06-28 흡수성 물품

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2018-125328 2018-06-29
JP2018-125325 2018-06-29
JP2018-125326 2018-06-29
JP2018125325A JP6838013B2 (ja) 2018-06-29 2018-06-29 吸収性物品
JP2018-125327 2018-06-29
JP2018125326A JP6839135B2 (ja) 2018-06-29 2018-06-29 吸収性物品
JP2018125327A JP6838014B2 (ja) 2018-06-29 2018-06-29 吸収性物品
JP2018125328A JP6838015B2 (ja) 2018-06-29 2018-06-29 吸収性物品

Publications (1)

Publication Number Publication Date
WO2020004645A1 true WO2020004645A1 (fr) 2020-01-02

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KR (2) KR102560789B1 (fr)
CN (3) CN114748249B (fr)
WO (1) WO2020004645A1 (fr)

Cited By (1)

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EP3799848B1 (fr) 2020-03-19 2022-04-13 Ontex BV Articles absorbants et leurs procédés de fabrication

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JPS5320690A (en) * 1976-08-09 1978-02-25 Colgate Palmolive Co Disposable absorbent article
JPS5444953A (en) * 1977-06-27 1979-04-09 Procter & Gamble Disposable absorbent bandage of low density
JP2017014679A (ja) * 2005-05-02 2017-01-19 インターナショナル・ペーパー・カンパニー リグノセルロース系材料及びこれから製造した生成物
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CN114748248B (zh) 2022-09-27
CN114748249A (zh) 2022-07-15
KR20200019754A (ko) 2020-02-24
CN114748248A (zh) 2022-07-15
KR102381597B1 (ko) 2022-04-01
CN112334111B (zh) 2022-06-24
CN112334111A (zh) 2021-02-05
KR20210118984A (ko) 2021-10-01
CN114748249B (zh) 2023-04-25
KR102560789B1 (ko) 2023-07-26

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