WO2015087680A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2015087680A1
WO2015087680A1 PCT/JP2014/080741 JP2014080741W WO2015087680A1 WO 2015087680 A1 WO2015087680 A1 WO 2015087680A1 JP 2014080741 W JP2014080741 W JP 2014080741W WO 2015087680 A1 WO2015087680 A1 WO 2015087680A1
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WO
WIPO (PCT)
Prior art keywords
basis weight
absorbent core
absorbent article
lateral
absorbent
Prior art date
Application number
PCT/JP2014/080741
Other languages
English (en)
Japanese (ja)
Inventor
達之 山口
加藤　隆弘
祐貴 塚本
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN201480065500.1A priority Critical patent/CN105792785B/zh
Publication of WO2015087680A1 publication Critical patent/WO2015087680A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/4704—Sanitary towels, incontinence pads or napkins having preferential bending zones, e.g. fold lines or grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F2013/4708—Panty-liner

Definitions

  • the present invention relates to absorbent articles such as sanitary napkins, panty liners (orimono sheets), and incontinence pads.
  • Patent Documents 1 and 2 disclose an absorber having a raised portion having a groove near the center of the absorber.
  • Patent Document 3 discloses a technique for improving the diffusion and retention performance of body fluid by arranging a high-density region in a region including both sides of the middle and high portions provided in the excretion portion facing portion.
  • the absorber in Patent Document 1 has a laminated structure having an upper layer and a lower layer, and a depression extending over the upper and lower layers is formed in a central region where the upper layer exists and forms a raised portion.
  • the recess is formed by hot embossing, and since the vicinity of the bottom of the recess is consolidated, the liquid hardly diffuses from the vicinity of the bottom of the recess to other parts, preventing wetback performance and absorption. There is room for improvement in terms of effective utilization of the body's absorption capacity.
  • Patent Document 2 discloses a structure in which a bump having a plurality of convex portions is provided on an absorber having a large number of block-shaped convex portions, and the density of the block absorbing portions in the middle and high portions is made higher than the surroundings. Is disclosed. However, the density of the middle and high block absorption parts is increased by compressing the entire block absorption part, and since the density of the block absorption part is uniform, the body fluid diffusibility from the liquid excretion part to the surrounding part is improved. There is room for improvement, and as a result, there is room for improvement in terms of wetback prevention performance and effective utilization of the absorbent capacity.
  • the present invention relates to an absorbent article provided with an absorbent core that is long in the front-rear direction of the absorbent article.
  • the absorbent core has, in the width direction, a central region and lateral regions located on both sides thereof, and the central region has a protruding portion that protrudes above the upper surface of each of the lateral regions. .
  • the central region and the lateral region are integrally formed, and both the widthwise side portions of the central region are compressed, and the density is higher than the protruding portion located on the inner side in the widthwise direction. It has a high density part.
  • a longitudinal groove having a bottom on the non-skin contact surface side is formed along the longitudinal direction of the absorbent core by reducing the basis weight of the absorbent core forming material. Is formed.
  • the vertical groove has a width in the bottom that is narrower than the opening.
  • FIG. 1 is a perspective view showing a sanitary napkin according to an embodiment of the present invention.
  • 2A is a cross-sectional view taken along the line IIa-IIa in FIG. 1
  • FIG. 2B is a cross-sectional view taken along the line IIb-IIb in FIG.
  • FIG. 3A to FIG. 3C are explanatory diagrams of an example of a method for forming high-density portions having higher density than the protruding portions and higher basis weight than the side regions on both sides of the central region.
  • FIG. 4 is a schematic view showing a deformed state of the absorbent core when the sanitary napkin of FIG. 1 is worn.
  • FIG. 5 (a) and 5 (b) are schematic views showing a cross-section along the circumferential direction of the fiber stack drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG.
  • FIG. 6A and FIG. 6B are explanatory views showing an example of a method for forming a compression portion invaginated in the longitudinal groove.
  • An object of the present invention is to provide an absorbent article that can further enhance the performance of the above-described prior art.
  • a sanitary napkin 1 (hereinafter also simply referred to as napkin 1) as an embodiment of the absorbent article of the present invention is a night napkin suitable for use at bedtime, and preferably has a length of 30 cm or more. Is. As shown in FIG. 1, the napkin 1 has an absorbent main body 6 that is long in the front-rear direction, a pair of wing portions 7, 7, and a pair of rear flap portions 8, 8. With respect to absorbent articles such as sanitary napkins, the “front-rear direction” is a direction that coincides with the wearer's front-rear direction when worn.
  • the front-back direction is a longitudinal direction, and the direction orthogonal to this is called a width direction.
  • the absorptive main body 6 has a front part A, a liquid excretion part facing part B, and a rear part C in its longitudinal direction, and a pair of wing parts 7 and 7 on the left and right sides of the liquid excretion part facing part B.
  • the left and right sides of the part C have a pair of rear flap parts 8 and 8.
  • the liquid excretion part facing part B is a part in which the central part in the width direction is disposed to face the wearer's liquid excretion part (vagina opening), and the front part A is the front side of the wearer from the liquid excretion part facing part B (
  • the rear part B is a part arranged on the back side of the wearer from the liquid excretion part facing part B.
  • the napkin 1 includes a skin-side sheet 2 that forms a skin contact surface that faces the wearer's skin when worn, a non-skin-side sheet 3 that forms a non-skin contact surface that faces the clothing side such as shorts when worn, And the absorptive core 4 arrange
  • the skin-side sheet 2 includes a liquid-permeable surface sheet 2a and a pair of three-dimensional guard forming sheets 2b and 2b joined to both sides thereof.
  • the liquid permeable top sheet 2 a is arranged at the center in the width direction of the absorbent main body 6 so as to cover the entire length of the absorbent main body 6.
  • the three-dimensional guard forming sheet 2b is formed in such a manner that the side edge 21 on the center side in the width direction of the absorbent main body is overlapped on the surface sheet 2a at a position slightly outward from the side edge 21 in the width direction. 2a.
  • the solid guard forming sheet 2b has an elastic member (not shown) for forming a solid guard in the vicinity of the side edge portion 21, and when worn, due to the contraction force of the elastic member, the liquid excretion portion facing portion A solid guard is formed by standing so that a portion having a predetermined width from the side edge portion 21 in B is separated from the top sheet 2a.
  • the pair of wing portions 7, 7 and the pair of rear flap portions 8, 8 are composed of a three-dimensional guard forming sheet 2 b and a non-skin side sheet 3 extending from both side edges of the absorbent core 4.
  • a wing portion adhesive portion (not shown) for fixing to the non-skin contact surface of the crotch portion of the shorts is provided on the surface formed of the non-skin side sheet 3 of each of the pair of wing portions 7.
  • the non-skin contact surface is provided with a main body adhesive portion (not shown) for fixing the main body 6 to the inner surface of the shorts.
  • the rear flap 8 is arranged on the inner surface (skin contact surface) of the shorts when worn.
  • an adhesive portion for fixing to the inner surface of the shorts is also provided on the surface of the rear flap portion 8 made of the non-skin side sheet 3.
  • the skin-side sheet 2 and the non-skin-side sheet 3 are joined to each other with an adhesive from the periphery of the absorbent core 4 and are joined to each other at the periphery of the napkin 1 by heat sealing.
  • the skin-side sheet 2 and the absorbent core 4 and the absorbent core 4 and the non-skin-side sheet 3 are also bonded to each other by a pattern-coated adhesive such as dots, spirals, and stripes. Is preferred.
  • the absorbent core 4 in the napkin 1 is composed of a fiber assembly made of a fiber material such as pulp fiber or a material in which a superabsorbent polymer is held between fibers of the fiber assembly.
  • the upper and lower surfaces of the absorbent core 4 are covered with a core wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric.
  • the core wrap sheet is used for the purpose of preventing leakage of the forming material of the absorbent core or improving the shape retention of the absorbent core.
  • the absorbent core 4 in the napkin 1 has a shape that is long in the same direction as the front-rear direction of the napkin 1. Moreover, the absorptive core 4 has the center area
  • the width W1 of the protrusion 5 is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, with respect to the total width W2 of the absorbent core. More preferably, it is 70% or less, preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less.
  • the protrusion 5 of the absorbent core 4 and the raised portion 11 formed thereby in the napkin 1 have a long shape in the longitudinal direction of the absorbent core, as shown in FIG. It is formed from the part facing part B to a part of the rear part C. More specifically, it is formed in the range from the vicinity of the front end of the liquid excretion part facing part B to the vicinity of the central part in the X direction of the rear part C. It is preferable that the protrusion part 5 and the protruding part 11 are formed from the liquid excretion part opposing part B to a part of the rear part C in the front-rear direction X of the napkin 1 (absorbent article).
  • the protrusion part 5 and the protruding part 11 are formed over the length of 30% or more of the total length of the napkin 1 in the front-rear direction X, and the length of the total length of the napkin 1 is 40% or more. More preferably, it is formed over 50% or more of the total length of the napkin 1. The same applies to the longitudinal grooves 50 and the high density portions 41a described later.
  • a vertical groove 50 having a bottom portion is formed. That is, the vertical groove 50 is not formed by compressing a part of the protruding portion 5 by embossing or the like, but a portion having a low basis weight of the absorbent core forming material is provided in a part of the protruding portion 5. Is formed.
  • the vertical groove 50 has the opening part 50a in the skin contact surface of the absorptive core 4, and the bottom part 50b in the non-skin contact surface side. In the napkin 1 shown in FIG.
  • the number of vertical grooves 50 provided in the protruding portion 5 is one, but the number of vertical grooves provided in the protruding portion is not limited to this, and is intermittent in the width direction Y. A plurality of them may be provided.
  • the vertical groove 50 is arranged so as to cut the protrusion 5 along the longitudinal direction of the protrusion 5.
  • the protruding portion 5 of the absorbent core 4 is formed with a lateral groove 44a having a bottom portion on the non-skin contact surface side, which is formed by reducing the basis weight of the forming material of the absorbent core 4 similarly to the longitudinal groove 50.
  • the lateral groove 44 a extends along the width direction Y of the absorbent core 4.
  • a plurality of lateral grooves 44 a are intermittently provided in the protruding portion 5 in the longitudinal direction X.
  • the lateral groove 44a is provided so as to cross the protruding portion 5 along the width direction of the protruding portion.
  • a high basis weight portion 42 and a low basis weight portion 43 that forms the bottom of the longitudinal groove 50 are formed in the width direction Y of the absorbent core 4.
  • the low basis weight portions 43 extend along the longitudinal direction X of the absorbent core 4.
  • the high basis weight part 42 is a part where the basis weight of the absorbent core forming material is relatively higher than the low basis weight part 43, and the low basis weight part 43 is the basis weight of the absorbent core forming material. Is a portion having a relatively low basis weight as compared with the high basis weight portion 42.
  • the basis weight of the low basis weight portion 43 that forms the bottom of the longitudinal groove 50 is preferably 5% or more, more preferably 10%, relative to the basis weight of the high basis weight portion 42. In addition, it is preferably 50% or less, more preferably 40% or less, preferably 5% or more and 80% or less, and more preferably 10% or more and 70% or less.
  • the basis weight of the high basis weight portion 42 is preferably 200 g / m 2 or more, more preferably 300 g / m 2 or more, and preferably 800 g / m 2 or less, more preferably 700 g / m 2 or less.
  • the basis weight of the low basis weight portion 43 is preferably 10 g / m 2 or more, more preferably 15 g / m 2 or more, and preferably 400 g / m 2 or less, more preferably 350 g / m 2 or less. It is more preferably at 10 g / m 2 or more 400 g / m 2 or less and preferably, 25 g / m 2 or more 300 g / m 2 or less.
  • the high basis weight portion 42 not only has a larger basis weight than the low basis weight portion 43 that forms the bottom of the longitudinal groove 50, but also has a larger thickness.
  • the thickness of the low basis weight portion 43 is such that the ratio to the thickness of the high basis weight portion 42 is preferably 5% or more, more preferably 10% or more, and preferably 50% or less, more preferably 40% or less. In addition, it is preferably 5% or more and 50% or less, and more preferably 10% or more and 40% or less.
  • the thickness of the high basis weight portion 42 is preferably 1.5 mm or more, more preferably 2 mm or more, preferably 10 mm or less, more preferably 8 mm or less, and 1.5 mm or more and 10 mm or less.
  • the thickness of the low basis weight portion 43 is preferably 0.08 mm or more, more preferably 0.15 mm or more, preferably 5 mm or less, more preferably 4 mm or less, and 0.08 mm or more and 5 mm or less. It is preferable that it is 0.15 mm or more and 4 mm or less.
  • the value of the high basic weight part 42 mentioned above, and the various values in the relationship with the low basic weight part 43 are the case where the absorptive core is comprised including the horizontal groove 44a like the napkin 1 of this embodiment. May correspond to the high basis weight portion not including the lateral groove 44a.
  • the absorbent core is cut along the boundary line between the high basis weight portion 42 and the low basis weight portion 43 using a single blade razor manufactured by Feather, and the high basis weight portion 42 and the low basis weight so as to have a predetermined area. A small piece of the quantity part 43 is obtained.
  • the high basis weight portion 42 cuts out a portion sandwiched between the pair of low basis weight portions 43, 43 as a small piece. That is, the high basis weight part 42 is cut out as small block pieces partitioned by the low basis weight part 43.
  • the small piece When the small piece includes the low basis weight portion 48 that forms the bottom of the lateral groove 44a extending in the width direction, the high basis weight defined by the boundary line between the high basis weight portion 42, the low basis weight portion 43, and the low basis weight portion 48.
  • the quantity part 42 is cut out as a sample slice and used for measurement.
  • the small piece of the low basic weight part 43 cuts out the narrow part pinched
  • the weights of these pieces are measured using an electronic balance (an electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point).
  • the calculated basis weight is calculated by dividing the obtained weight by the area of the small basis weight portion 42 or the low basis weight portion 43. About each of the high basic weight part 42 and the low basic weight part 43, let the average of the basic weight of five small pieces be a basic weight.
  • the measurement of the thickness of the high basic weight part 42 and the low basic weight part 43 is performed by measuring the thickness of the small piece cut out in order to measure a basic weight about each site
  • the measurement part of the small basic weight part 42 and the low basic weight part 43 cut out from the absorbent article is pressurized with a pressure of 5 kPa for 10 minutes, and the measurement is performed immediately after dewetting.
  • An acrylic plate having a size of 20 mm ⁇ 20 mm and a thickness of 3 mm is placed on the absorber 3 in the central area of the sample after dewetting, and a non-contact type laser displacement meter (laser head LK-G30, displacement meter LK- manufactured by KEYENCE). Measure the thickness of the sample using the GD 500. If the size of the cut piece is small and difficult to measure with a non-contact type laser displacement meter, the cross section of the cut sample is, for example, a microscope (Keyence Corporation). It may be observed and measured at a magnification of 20 to 100 times using VHX-1000).
  • the high basis weight portion 42 has a higher density of the absorbent member than the low basis weight portion 43 that forms the bottom of the longitudinal groove 50.
  • Such a configuration is obtained, for example, by pressing the central region 41 of the absorbent core 4 in the process of manufacturing the absorbent core 4.
  • the pressure by a press concentrates on the thick high basic weight part 42, and the thin low basic weight part 43 does not receive a pressure by a press and is not compressed.
  • the high basis weight portion 42 is designed so that the density of the absorbent member is increased with respect to the low basis weight portion 43 by compressing only the high basis weight portion 42.
  • high basis weight portions 42 and low basis weight portions 48 that form the bottom of the lateral grooves 44 a are alternately formed in the longitudinal direction X of the absorbent core 4.
  • the high basis weight portion 42 has a higher density of the absorbent member in comparison with the low basis weight portion 48 that forms the bottom of the lateral groove 44a.
  • a density is calculated by using the basic weight and thickness obtained based on the measuring method mentioned above.
  • the high basis weight portion 46 has a higher density of the absorbent member than the low basis weight portion 47 that forms the bottom of the side longitudinal groove 52.
  • Such a configuration can be obtained as follows.
  • the lateral region 45 of the absorbent core 4 is pressed in a step different from the step of pressing the central region 41.
  • the pressure by the press is concentrated on the thick high basis weight portion 46, and the low low basis weight portion 47 is not compressed by the press and is not compressed.
  • the high basis weight part 46 is designed so that the density of the absorbent member is increased with respect to the low basis weight part 47 by compressing only the high basis weight part 46.
  • the press process used in this process is a measure such as using a press roll cut into a shape corresponding to the central area 41 or a roll having a press portion only in a part corresponding to the side area 45 of the absorbent core 4. It is devised so that only the side region of the absorbent core 4 is pressed.
  • the skin contact surface in the center area 41 of the absorptive core 4 Longitudinal grooves 50 that are recessed toward the non-skin contact surface are formed so as to extend in the width direction Y of the absorbent core 4.
  • the skin contact surface of an absorbent article or a component thereof is a surface that is directed toward the wearer's skin when worn on the absorbent article or the component thereof, and the non-absorption of the absorbent article or the component thereof.
  • the skin contact surface is a surface that is directed to the side opposite to the wearer's skin when worn on the absorbent article or its constituent members.
  • high basis weight portions 46 and low basis weight portions 47 are alternately formed in the width direction Y of the absorbent core 4.
  • the individual low basis weight portions 47 extend along the longitudinal direction X of the absorbent core 4.
  • the high basis weight portion 46 has a relatively high basis weight of the absorbent core forming material as compared to the low basis weight portion 47, and the low basis weight portion 47 has a high basis weight of the absorbent core forming material.
  • the basis weight is relatively low as compared with the amount portion 46.
  • the high basic weight part 46 and the low basic weight part 47 which have a basic weight difference and a density difference are formed in said aspect in the skin contact surface in the side area 45 of the absorptive core 4.
  • a plurality of side longitudinal grooves 52 that are recessed toward the non-skin contact surface side are formed extending in the longitudinal direction X of the absorbent core 4.
  • the basis weight of the low basis weight portion 47 that forms the bottom of the side longitudinal groove 52 is preferably a ratio of 5% or more, more preferably, to the basis weight of the high basis weight portion 46. Is 10% or more, preferably 50% or less, more preferably 40% or less, preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less. .
  • the basis weight of the high basis weight portion 46 is preferably 50 g / m 2 or more, more preferably 100 g / m 2 or more, and preferably 400 g / m 2 or less, more preferably 300 g / m 2 or less.
  • the basis weight of the low basis weight portion 47 is preferably 2.5 g / m 2 or more, more preferably 5 g / m 2 or more, and preferably 200 g / m 2 or less, more preferably 150 g / m 2 or less. In addition, it is preferably 2.5 g / m 2 or more and 200 g / m 2 or less, and more preferably 5 g / m 2 or more and 150 g / m 2 or less.
  • the high basis weight portion 46 not only has a larger basis weight than the low basis weight portion 47 that forms the bottom of the side longitudinal groove 52, but also has a larger thickness.
  • the thickness of the low basis weight portion 47 is such that the ratio to the thickness of the high basis weight portion 46 is preferably 5% or more, more preferably 10% or more, and preferably 50% or less, more preferably 40% or less. In addition, it is preferably 5% or more and 50% or less, and more preferably 10% or more and 40% or less.
  • the thickness of the high basis weight portion 46 is preferably 0.8 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, and 0.8 mm or more and 5 mm or less.
  • the thickness of the low basis weight portion 47 is preferably 0.04 mm or more, more preferably 0.08 mm or more, preferably 0.4 mm or less, more preferably 0.32 mm or less, and 0.04 mm. It is preferably 0.4 mm or less and more preferably 0.08 mm or more and 0.32 mm or less.
  • the value in the relationship with the high basic weight part 46 mentioned above and the low basic weight part 47 is the case where the absorptive core is comprised including the horizontal groove 44b like the napkin 1 of this embodiment. May correspond to a high basis weight part not including the lateral groove 44b.
  • the measuring method of the basic weight and thickness in each of the high basic weight part 46 and the low basic weight part 47 is performed in the same manner as the measuring method in the high basic weight part 42 and the low basic weight part 43 described above.
  • the high basis weight portion 42 of the central area 41 has a larger basis weight than the high basis weight portion 46 of the side area 45, and the thickness is also larger than the high basis weight section 46 of the side area 45. It has become.
  • the thickness t1 of the central region 41 becomes thicker than the thickness t2 of the side region 45, and the protruding portion 5 that protrudes above the upper surface S2 of the side region 45 is formed in the central region 41.
  • the ratio of the thickness t1 of the central region 41 to the thickness t2 of the side region 45 is preferably 110% or more, more preferably 120% or more, and preferably 400% or less, more preferably 300% or less.
  • the thickness t1 of the central region 41 is the thickness of the high basis weight portion 42 located in the central portion in the width direction of the central region 41, and the thickness t2 of the side region 45 is adjacent to the central region 41. This is the thickness of the high basis weight portion 46.
  • the ratio of the height t protruding from the upper surface S ⁇ b> 2 of the lateral region 45 to the total thickness t ⁇ b> 1 of the central region 41 is preferably 20% in both the liquid excretion portion facing portion B and the rear portion C.
  • the protrusion height t of the protrusion 5 is the same as the value obtained by subtracting the thickness t2 of the side area 45 from the total thickness t1 of the central area 41.
  • the high basis weight portions 46 and the low basis weight portions 49 are also alternately formed in the longitudinal direction X of the absorbent core 4 in the lateral region 45, and the individual low basis weight portions 49 are It extends along the width direction Y of the absorbent core 4.
  • a plurality of lateral grooves 44 b are intermittently arranged in the lateral region 45 in the longitudinal direction X.
  • the position in the longitudinal direction X of the absorptive core 4 matches the low basic weight part 48 of the central area 41 and the low basic weight part 49 of the lateral area 45 at the boundary part between the central area 41 and the lateral area 45.
  • the lateral groove 44a in the central region 41 and the lateral groove 44b in the lateral regions 45, 45 coincide with each other in the longitudinal direction X of the absorbent core 4 at the boundary portion. That is, the lateral groove 44a in the central region 41 and the lateral groove 44b in the lateral regions 45, 45 form one lateral groove 44 that continues from the central region 41 to the lateral regions 45, 45 of the absorbent core 4.
  • the lateral groove 44 extends over the entire width of the absorbent core 4.
  • a plurality of the lateral grooves 44 are formed at intervals in the longitudinal direction of the absorbent core 4.
  • the low basis weight portion 43 in the central region 41 and the low basis weight portion 47 in the side region 45 form a single low basis weight portion that extends continuously over the entire width of the absorbent core 4.
  • the single low basis weight part is smaller in the basis weight, thickness and density of the absorbent core forming material than the high basis weight part 46 in the side region 45.
  • Concerning the lateral groove 44, continuous from the central area to the lateral area means that the space in the lateral groove whose upper side is released extends from the central area to the lateral area without being interrupted between the central area and the lateral area. That exist continuously.
  • the horizontal groove 44 intersects the vertical groove 50 in a cross shape in plan view, but the other horizontal groove is on the extension of the space in the horizontal groove on one side facing the vertical groove.
  • the transverse groove is not interrupted at the intersection with the longitudinal groove.
  • the absorbent core 4 has the front central region 41 and the side regions 45 formed integrally, and is located on the inner side in the width direction on both sides in the width direction of the central region 41. It has a high density portion 41 a having a higher density than the protruding portion 5 and a higher basis weight than the side region 45.
  • the high-density portion 41a has a high basis weight portion 42 in the central area 41 of the absorbent core 4 when the napkin is manufactured, as shown in FIGS. 3 (a) to 3 (c). It is formed by compressing both sides in the width direction formed to have the same thickness as the portion 42 ′.
  • the longitudinal groove 50 of the protruding portion 5 has a width in the width direction of the bottom 50b that is narrower than the opening 50a. As shown in FIG. 2A, the longitudinal groove 50 is substantially V-shaped in a cross-sectional view in the width direction.
  • the body fluid is discharged to the protruding portion 5 of the central area 41 at the liquid excretion portion facing portion B.
  • the excrement is easily diffused in the longitudinal direction X by the longitudinal grooves 50 extending in the longitudinal direction X.
  • the vertical groove 50 has a shape in which the opening 50a is wide and the bottom 50b is narrow in the width direction Y
  • the body fluid that has entered the vertical groove 50 comes into contact with the side wall 50c of the vertical groove 50 while the bottom 50b. It flows in the direction of. Therefore, the body fluid is absorbed from the side wall 50c before reaching the bottom 50b, and diffuses in the width direction Y of the protrusion 5 and enters the thickness direction.
  • the central region 41 On the side of the central region 41, there is a high density portion 41a formed by compressing the protruding portion 5. For this reason, the body fluid which has spread in the width direction Y and the thickness direction is guided to the high density portion. Since the high-density portion has a higher basis weight of the absorbent material than the side region 45, the ability to hold body fluid is high. Therefore, the bodily fluid is dammed at both sides of the central area 41 and hardly reaches the both sides in the width direction of the napkin 1. For this reason, in the napkin 1, the side leakage of body fluid is easily suppressed.
  • the high-density part 41a since the high-density part 41a has substantially the same thickness as the high basic weight part 46 in the side area 45, the width
  • the present invention is not limited to this, and the thickness of the high-density portion 41 a is smaller than the thickness of the protruding portion 5 and thicker than the high basis weight portion 46 in the side region 45, or the side region 45.
  • integrated molding means that one member is manufactured using the same material, but different from members manufactured in separate steps by bonding means such as an adhesive or compression. It means that it is integrally formed. Therefore, for example, between the portion 42u forming the protruding portion 5 in the central region 41 and the portion 42d located below the portion 42u, there are layers of layers that are produced when two separately manufactured absorbent cores are stacked. There are no adjacent portions or joint portions, and adjacent portions between cores generated when two separately manufactured absorbent cores are arranged side by side at the boundary portion between the central region 41 and the side regions 45, 45. There is no joint. When the central region 41 including the protruding portion 5 and the pair of side regions 45, 45 are integrally formed, the liquid to be absorbed has continuity that can move smoothly. A method for manufacturing the absorbent core having such a structure will be described later.
  • the high density part 41a will be described more specifically.
  • the high-density portion 41a in the napkin 1 is formed to be thick including the portion that becomes the high-density portion 41a as shown in FIG. 3 (a) by using the fiber stacking device shown in FIG. 5 (a).
  • both sides of the central area 41 of the absorbent core 4A are compressed and formed.
  • the thickness is reduced by compressing certain portions of the left and right side portions of the projecting portion 5 in the central region 51, and the portion has a higher density than the uncompressed projecting portion 5.
  • a density portion 41a is formed.
  • the high-density part 41a has sufficient absorption capacity since the basic weight of an absorbent material is higher than the side region 45, since it has sufficient absorption capacity, a bodily fluid reaches
  • the high-density portion (region) 41a has almost the same thickness as the portion where the vertical groove 50 and the horizontal groove 44 in the side region 45 do not exist, but the present invention is not limited to this. Although the thickness is thinner than the protruding portion 5, the thickness may be thicker than the side region 45.
  • the longitudinal groove 50 of the protruding portion 5 gradually decreases in length in the width direction from the opening 50a toward the bottom 50b, and is seen in a cross-sectional view in the width direction.
  • the vertical groove 50 is substantially V-shaped.
  • a stepped cross-sectional shape may be used, but the substantially V-shaped shape efficiently contacts the wall surface of the side wall 50c from the opening 50a of the vertical groove 50 to the bottom 50b. Since the gap is gradually narrowed, the capillary force works from the longitudinal groove opening 50a to the bottom 50b, and the liquid can be taken into the absorbent core 4 more quickly. This is preferable because it is easily taken into the absorbent core 4 from the skin contact surface side.
  • the longitudinal groove 50 of the protrusion 5 has a width direction length La of the opening 50a of preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm.
  • the width direction length Lb of the bottom 50b is preferably 1 mm or less, and more preferably 0.5 mm or less.
  • the lower limit of the width direction length Lb of the bottom 50b is 0 (zero).
  • the depth of the vertical groove 50 is preferably 0.5 mm or greater and 5.0 mm or less, and more preferably 1.0 mm or greater and 3.0 mm or less.
  • the difference in length in the width direction between the opening 50a and the bottom 50b is preferably 0.5 mm or more and 3.0 mm or less, and more preferably 1.0 mm or more and 2 or less. 0.0 mm or less.
  • the longitudinal groove 50 preferably has a depth ratio [depth / difference (La ⁇ Lb)] to a difference in length in the width direction between the opening 50a and the bottom 50b (La ⁇ Lb). 5 or more and 20 or less, more preferably 1 or more and 10 or less. Within this range, the shape of the longitudinal groove during wearing is easily stabilized, and it becomes easy to maintain a preferable shape for taking in excreta.
  • the bottom 50b of the vertical groove 50 is located below the upper surface S2 of the side region 45.
  • the position of the upper surface S ⁇ b> 2 of the side region 45 here is the upper surface of the high basis weight portion 46 in the side region 45 adjacent to the central region 41.
  • the bottom 50b of the longitudinal groove 50 is preferably located below the upper surface S2 of the lateral region 45 over the entire region of the central region 41 in the longitudinal direction X of the absorbent core 4.
  • the liquid is taken into the absorbent core 4 from the surface of the napkin 1, the liquid is diffused inside the absorbent core 4, thereby suppressing the diffusion of the liquid on the surface of the napkin 1 and the back surface of the napkin 1. It becomes possible to diffuse the liquid. For this reason, the wetted part of the napkin 1 surface due to the liquid can be reduced to provide a comfortable dry feeling to the user, and the liquid can be easily transmitted to the side area 45 of the absorbent core 4. Since it is possible to utilize the absorption capacity of the core 4 more efficiently, it is possible to provide a product that does not leak even when used for a long time.
  • the low basis weight portion 43 in the central region 41 has a smaller basis weight and thickness than the high basis weight portion 46 in the side region 45, whereby the longitudinal groove 50 and the lateral groove 44 are absorbent.
  • the bottom portion is located below the upper surface S ⁇ b> 2 of the side region 45 across the entire central region 41 in the longitudinal direction X and the width direction Y of the core 4.
  • the plurality of the lateral grooves 44 are portions P1, P1 adjacent to the side region 45 of the central region 41 in the width direction Y of the absorbent core 4 [FIG. 2 (b). 44d is located below the upper surface S2 of the side area 45. As shown in FIG. 2B, the bottom 44 d of the lateral groove 44 is located below the upper surface S ⁇ b> 2 of the side region 45 over the entire region of the central region 41 in the width direction of the absorbent core 4. It is preferable.
  • the low basis weight portion 43 in the central region 41 has a smaller basis weight and thickness than the high basis weight portion 46 in the side region 45, whereby the longitudinal groove 50 and the lateral groove 44 are absorbent.
  • the bottom portion is located below the upper surface S ⁇ b> 2 of the side region 45 across the entire central region 41 in the longitudinal direction X and the width direction Y of the core 4.
  • Whether or not the bottoms of the vertical grooves 50 and the horizontal grooves 44 are located below the position of the upper surface S2 of the lateral region 45 depends on the portion 43 that forms the bottom 50b of the vertical groove 50 or the lateral region 45 of the central region 41. Judgment is made by measuring the thickness of the portion forming the bottom 44d in the adjacent portions P1 and P1 and the thickness of the high basis weight portion 46 of the side region 45. Specifically, first, the absorbent core 4 is taken out from the napkin 1, and the thickness of the high basis weight portion 46 in the side region 45 is measured with the bottom surface of the central region 41 as a base point.
  • Thickness is measured by pressurizing each part for 10 minutes at a pressure of 5 kPa, placing an acrylic plate with a size of 20 mm x 20 mm and thickness 3 mm on the measurement part after dewetting, and a non-contact type laser displacement meter (laser head) manufactured by KEYENCE. LK-G30 and displacement meter LK-GD 500. Next, using a single-edged razor manufactured by Feather Co., Ltd.
  • the cross section of the cut sample is 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE). It is possible to observe and measure at a magnification of 1.
  • the thickness of the high basis weight portion 46 of the side area 45 obtained previously, and the measurement part at the bottom in the parts P1, P1 adjacent to the side area 45 of the central area 41 If the thickness of the vertical groove 50 is large, it is determined that the bottoms of the vertical groove 50 and the horizontal groove 44 are located below the position of the upper surface S2 of the side region 45.
  • the absorbent core 4 has a concavo-convex shape on the skin contact surface due to the presence of the lateral groove and the vertical groove in both the central region 41 and the side region 45, while the non-skin contact surface side is flat. ing.
  • the central region 41 having the protrusions 5 has a deep depth and the bottom 44d reaches a position deeper than the upper surface S2 of the lateral region 45, and from the central region 41 to the lateral region 45.
  • the lateral groove 44 is also formed, and the lateral groove 44 is formed by reducing the basis weight of the material for forming the absorbent core. Nevertheless, it is rich in deformability and hardly causes wrinkles on the skin contact surface. Therefore, as shown in FIG. 4, the entire shape is made to conform to the wearer's body shape while keeping the protruding portion 5 and the raised portion 11 formed thereby along the wearer's liquid excretion portion or tear.
  • the absorbent core is integrally formed and the lateral groove 44 is formed by reducing the basis weight of the material for forming the absorbent core, the liquid absorbed from the protruding portion 5 has a thickness in the central region 41.
  • the liquid easily diffuses from the vicinity of the bottom of the lateral groove 44 to other parts, and the liquid staying in the vicinity of the bottom of the lateral groove 44 does not return to the skin contact surface by pressurization. Therefore, even when a large amount of liquid is supplied, the liquid hardly remains on the skin contact surface, and a comfortable wearing feeling can be obtained.
  • the ratio of the depth of the lateral groove 44a (44) in the central area 41 to the thickness t1 of the central area 41 is preferably 50% or more.
  • it is 60% or more, preferably 95% or less, more preferably 90% or less, preferably 50% or more and 95% or less, and preferably 60% or more and 90% or less. Is more preferable.
  • the width W of the lateral groove 44 is preferably 0.2 mm or more, more preferably 0.5 mm or more, preferably 3 mm or less, more preferably 2 mm or less, and 0.2 mm or more and 3 mm or less. It is preferable that it is 0.5 mm or more and 2 mm or less.
  • the width W of the lateral groove 44 is a dimension in the longitudinal direction X of the absorbent core as shown in FIG.
  • the high basis weight portion 42 in the central area 41 since the high basis weight portion 42 in the central area 41 has a higher density than the low basis weight portion 43, body fluid taken into the lateral groove 44 is quickly taken into the high basis weight portion 42. It has become. For this reason, the body fluid is absorbed in the longitudinal direction of the absorbent core 4 while being transmitted through the lateral groove 44, so that the body fluid is efficiently absorbed in the central region. As a result, the suppression of liquid leakage from the absorbent core 4 is improved.
  • the high basis weight portion 46 since the high basis weight portion 46 has a higher density than the low basis weight portion 47 in the side region 45, the same effect can be obtained.
  • the density of the low basis weight part is preferably 5% or more, more preferably 10% or more, and preferably the ratio to the density of the adjacent high basis weight part. It is 50% or less, more preferably 40% or less, preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less.
  • a plurality of compression portions compressed so as to be integrated toward the absorbent core 4 from the surface sheet 2a side are provided in the central region 41.
  • the surface sheet 2a is indented in the vertical groove 50 in the part which a compression part overlaps with the vertical groove 50 of the center area 41.
  • FIG. 6A and FIG. 6B show a highly viscous body fluid such as menstrual blood.
  • the compression unit overlaps the surface sheet 2a on the skin contact surface side of the absorbent core 4, and the surface sheet 2a and the absorption from the surface sheet 2a side. It is formed by pressing the sex core 4.
  • the pressing is performed by, for example, pressing a portion indicated by reference numeral 61 in FIG. 6A with the embossing convex portion 6 provided on the peripheral surface of the roll.
  • the side region 45 is also provided with side longitudinal grooves 52 extending in the longitudinal direction.
  • the opening 52a located on the skin contact surface side and the bottom 52b located on the non-skin side surface side have substantially the same length in the width direction.
  • substantially the same means that the difference in width direction length between the opening and the bottom at the same position in the longitudinal direction is within 5%.
  • the opening 52a of the lateral longitudinal groove 52 is made wider than the bottom 52b, the opening is more greatly deformed by the compressive force that the napkin 1 receives from the lower part of the user's foot during wearing.
  • One side edge portion may be deformed so as to be rounded toward the user. Such deformation is caused by the napkin 1 side edge warping toward the user's skin side, so that the napkin 1 hits the buttocks strongly, or the user's skin and the surface of the napkin 1 are separated from each other at the center of the napkin 1. May occur.
  • the opening 52a and the bottom 52b have substantially the same length in the width direction, the risk of occurrence of such a problem can be reduced. Moreover, it is useful for the stability of the shape of the longitudinal groove 50 in the central region 41 in the present invention.
  • the lateral longitudinal groove 52 is adjacent to the high density portion.
  • the absorbent core 4 in contact with the lateral side of the lateral longitudinal groove 52 and the absorbent core 4 in contact with the central side of the lateral longitudinal groove 52 are different in hardness. It becomes easy to bend the side edge part in the direction opposite to the user's skin with the longitudinal groove 52 as a basic axis, and by making the shape of the napkin 1 being worn more stable, the user feels uncomfortable feeling by wearing the napkin 1 In addition to the reduction, the central part of the napkin 1 is more closely attached to the user's skin, and the liquid can be absorbed more efficiently.
  • the liquid is prevented from exuding to the side of the high-density portion, and more The liquid is fixed in an area close to the central area of the napkin 1, and there is an effect that liquid leakage from the side edge of the napkin 1 is prevented.
  • the bottom portion 50b of the vertical groove 50 in the central region 41 is located on the non-skin contact surface side with respect to the bottom surface of the lateral vertical groove 52 (the upper surface of the bottom portion 52b).
  • the side portion of the napkin 1 is bent in the direction opposite to the user's skin with the vertical groove 50 positioned on the non-skin contact surface side as a base axis, and then the bottom surface becomes more skin.
  • the side part of the napkin 1 is bent more in the direction opposite to the user's skin with the side vertical groove 52 located on the contact surface side as a basic axis, and the shape of the napkin 1 being worn is further stabilized. Is possible.
  • the absorptive core 4 of the napkin 1 described above is provided with the accumulation recess 55 on the outer peripheral surface, and the stacking drum 54 that rotates in one direction R, and the absorbent core forming material is scattered on the outer peripheral surface of the stacking drum 54.
  • the processing shown in FIGS. 3 (a) to 3 (c) is performed.
  • a plurality of stacking recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54.
  • the bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.
  • a recess 56 a for forming the central region 41 having the protrusions 5 is formed on a part of the bottom surface 56 of the accumulation recess 55.
  • a breathable member 57 for forming low basis weight portions such as the low basis weight portions 43, 43 is disposed at the bottom of the accumulation recess 55.
  • the air-impermeable member 57 is fixed so as to protrude from the bottom surface of the accumulation recess 55, and may be a non-air-permeable member, for example, made of metal or plastic. As shown in FIG.
  • the material for forming the absorbent core is supplied into the duct while sucking from the bottom surface of the accumulation recess 55, as in the known fiber stacking device including the fiber stacking drum.
  • the material for forming the absorbent core is deposited in a predetermined shape in the accumulation recess 55.
  • the absorbent core 4A is obtained by releasing the deposit 4 'from the accumulation recess 55.
  • the absorbent core 4A may be pressed and compressed appropriately by passing between a pair of rolls before or after coating with the core wrap sheet.
  • the portion 43 ′ made of the core forming material deposited on the breathable member 57 becomes the low basis weight portion 43 or the like, and the portion deposited on the bottom surface without the breathable member 57.
  • the high basic weight part 42 'becomes the high basic weight part 42 grade
  • the press (compression) for forming the high-density portion 41a may be performed simultaneously with the pressing of the central region 41 or simultaneously with the pressing of the lateral region 45 using a roll having a step on the peripheral surface. Moreover, it is also possible to carry out simultaneously with the pressing of the central area 41 and the pressing of the side area 45 by designing the level difference formed on the roll peripheral surface to an appropriate dimension. Further, it can be performed in a separate process from the pressing of the central area 41 and the pressing of the lateral area 45, before the pressing of the central area 41, between the pressing of the central area 41 and the pressing of the lateral area 45, You may perform in the process different from those presses after the side area 45 press. When manufacturing the absorptive core containing a water absorbing polymer, it is preferable to provide the introduction part of a water absorbing polymer in the middle of a duct.
  • the surface sheet 2a and the non-skin side sheet 3 those similar to those conventionally used in the technical field can be used without particular limitation.
  • a liquid-permeable nonwoven fabric or a perforated film can be used as the top sheet 2a.
  • a water-repellent nonwoven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used.
  • the three-dimensional guard forming sheet 2b a water-repellent nonwoven fabric having a high water pressure resistance, for example, a spunbond-meltblown-spunbond laminated nonwoven fabric or the like can be used as the three-dimensional guard forming sheet 2b.
  • the lateral groove 44 extending from the central area 41 to the lateral area 45 may be formed only in the liquid excretion part facing part of the absorbent article, or may be formed only in the rear part.
  • the absorbent core may be composed only of a fiber material such as pulp fiber, or may include both a fiber material and a superabsorbent polymer.
  • a fiber material such as pulp fiber
  • various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation.
  • pulp fibers, rayon fibers, cotton Short fibers of cellulosic fibers such as fibers, short fibers of synthetic fibers such as polyethylene, and the like are used. These fibers can be used alone or in combination of two or more.
  • the fiber material is preferably entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%.
  • the absorbent core may contain a deodorant or an antibacterial agent as necessary.
  • the density of the high basis weight portion is higher than that of the low basis weight portion.
  • the density of both may be the same by omitting the pressing step of the absorbent core.
  • the lateral groove 44a formed in the central area 41 has a pressing section.
  • the top sheet 2a may be indented.
  • the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, disposable diapers in addition to sanitary napkins.
  • panty liners origami sheets
  • incontinence pads disposable diapers in addition to sanitary napkins.
  • the description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.
  • An absorbent article provided with an absorbent core having a long shape in the front-rear direction of the absorbent article,
  • the absorbent core has, in the width direction, a central region and lateral regions located on both sides thereof, and the central region has a protruding portion that protrudes upward from the upper surface of each of the lateral regions.
  • the central area and the side area are integrally formed, and both sides of the central area in the width direction are higher in density than the protrusions, and have a smaller area than the side area.
  • a high-density portion having a high amount is formed, and the skin contact surface of the protruding portion is formed by reducing the basis weight of the absorbent core forming material along the longitudinal direction of the absorbent core.
  • An absorbent article wherein a longitudinal groove having a bottom portion is formed on the skin contact surface side, and the longitudinal groove has a width direction length of the bottom portion narrower than an opening portion.
  • ⁇ 4> The absorbent article according to ⁇ 3>, wherein a plurality of the lateral grooves are intermittently arranged in the longitudinal direction (synonymous with the longitudinal direction of the absorbent core).
  • ⁇ 5> The absorbent article according to any one of ⁇ 1> to ⁇ 4>, wherein the vertical groove cuts the protruding portion in the vertical direction.
  • a liquid-permeable surface sheet is disposed on the skin contact surface side of the absorbent core, and a pressing portion in which the surface sheet and the absorbent core are pressed together is provided in the central region.
  • a lateral longitudinal groove extending in the longitudinal direction of the absorbent core is disposed on the skin contact surface side of the lateral region of the absorbent core, and the lateral longitudinal groove has a width between the opening and the bottom.
  • ⁇ 11> The ⁇ 3> to ⁇ 10, wherein the lateral groove has a bottom portion on the non-skin contact surface side, and the bottom portion is positioned on the non-skin contact surface side with respect to the upper surface of the side region.
  • ⁇ 12> The absorbent article according to any one of ⁇ 1> to ⁇ 11>, wherein the width of the protruding portion is 20% to 80% of the total width of the absorbent core.
  • ⁇ 13> The absorbent article according to any one of ⁇ 1> to ⁇ 12>, wherein the protrusion is formed over a length of 30% or more of a total length in the front-rear direction of the absorbent article.
  • ⁇ 16> The absorbent article according to ⁇ 15>, wherein in the central region, the thickness of the low basis weight part is 5% or more and 50% or less with respect to the thickness of the high basis weight part.
  • ⁇ 17> The absorbent article according to any one of ⁇ 1> to ⁇ 16>, wherein the thickness of the central region is 110% or more and 400% or less with respect to the thickness of the side region.
  • the lateral groove in the central region and the lateral groove in the lateral region form one lateral groove that extends from the central region to the lateral region of the absorbent core, and the lateral groove is the full width of the absorbent core.
  • the absorbent article according to any one of ⁇ 3> to ⁇ 17> which extends over the entire area.
  • ⁇ 19> The absorbent article according to any one of ⁇ 1> to ⁇ 18>, wherein a gap exists between the longitudinal groove and the top sheet in the lateral region.
  • ⁇ 20> The absorbent article according to any one of ⁇ 1> to ⁇ 19>, wherein, in the central region, the top sheet is indented at the pressing portion in the lateral groove.
  • the longitudinal groove La of the projecting portion has a width direction length La of preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.
  • the longitudinal groove of the protruding portion has a width direction length Lb of a bottom portion of preferably 1 mm or less, more preferably 0.5 mm or less, and a lower limit of 0 (zero).
  • ⁇ 23> Any one of the items ⁇ 1> to ⁇ 22>, wherein the vertical groove of the protrusion has a depth of 0.5 mm to 5.0 mm, and more preferably 1.0 mm to 3.0 mm.
  • the longitudinal groove in the central region has a difference in length in the width direction between the opening and the bottom (La ⁇ Lb) of 0.5 mm to 3.0 mm, more preferably 1.0 mm to 2
  • the vertical groove in the central region has a depth ratio [depth / difference (La ⁇ Lb)] to a difference in length in the width direction between the opening and the bottom (La ⁇ Lb).
  • the absorbent article according to any one of ⁇ 1> to ⁇ 24> which is 5 or more and 20 or less, more preferably 1 or more and 10 or less.
  • ⁇ 26> The absorbent article according to any one of ⁇ 1> to ⁇ 25>, wherein the absorbent article is a sanitary napkin.
  • the absorbent article of the present invention has high body fluid absorption performance and is effective in suppressing side leakage of body fluids.

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

Abstract

La présente invention concerne un article absorbant comprenant un cœur absorbant (4) dont la forme est allongée dans la direction avant-arrière de l'article absorbant. Le cœur absorbant (4) comprend, agencée dans le sens de la largeur de celui-ci, une région centrale (41) et des régions latérales (45, 45) situées sur les deux côtés de la région centrale (41). La région centrale (41) comporte une protubérance (5) qui dépasse plus loin vers le haut que les surfaces supérieures des régions latérales. Dans le cœur absorbant (4), la région centrale (41) et les régions latérales (45) sont formées d'une seule pièce, et la région centrale (41) comporte sur ses deux côtés des sections de haute densité (41a) dont la densité est supérieure à celle de la protubérance (5) et dont la quantité en poids est également supérieure à celle des régions latérales (45). La surface en contact avec la peau de la protubérance (5) comprend formée en elle un sillon longitudinal (50) dans la direction longitudinale par réduction de la quantité en poids d'un matériau qui forme le cœur absorbant, le sillon longitudinal (50) ayant une section de fond (50b) sur son côté de surface qui n'est pas en contact avec la peau. Dans le sillon longitudinal (50), la longueur de la section de fond (50b) dans la direction de la largeur est inférieure à la longueur de son ouverture (50a) dans la direction de la largeur.
PCT/JP2014/080741 2013-12-11 2014-11-20 Article absorbant WO2015087680A1 (fr)

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JP2013255726A JP6257297B2 (ja) 2013-12-11 2013-12-11 吸収性物品

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WO2017069666A1 (fr) * 2015-10-20 2017-04-27 Sca Hygiene Products Ab Article absorbant, noyau absorbant et procédé de fabrication dudit article absorbant
CN107949361A (zh) * 2015-09-07 2018-04-20 尤妮佳股份有限公司 吸收性物品
US11285053B2 (en) 2015-10-20 2022-03-29 Essity Hygiene And Health Aktiebolag Absorbent article with an absorbent core having two longitudinally extending side regions and a longitudinally extending central region between said side regions and method for manufacturing said absorbent article

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JP6632343B2 (ja) * 2015-11-12 2020-01-22 花王株式会社 吸収性物品
JP6538527B2 (ja) * 2015-11-12 2019-07-03 花王株式会社 吸収性物品
JP6940933B2 (ja) * 2015-11-12 2021-09-29 花王株式会社 吸収性物品
JP6646441B2 (ja) * 2015-12-28 2020-02-14 花王株式会社 吸収性物品
JP6674326B2 (ja) * 2016-06-03 2020-04-01 花王株式会社 吸収性物品
JP6320467B2 (ja) * 2016-07-08 2018-05-09 ユニ・チャーム株式会社 吸収性物品
JP6764781B2 (ja) * 2016-12-27 2020-10-07 花王株式会社 吸収性物品
JP7086730B2 (ja) * 2018-06-04 2022-06-20 大王製紙株式会社 吸収性物品
WO2019235427A1 (fr) * 2018-06-05 2019-12-12 花王株式会社 Article absorbant
JP7125310B2 (ja) * 2018-09-04 2022-08-24 花王株式会社 パッド型吸収性物品
JP6692866B2 (ja) * 2018-09-04 2020-05-13 花王株式会社 吸収性物品
JP7097275B2 (ja) * 2018-09-28 2022-07-07 花王株式会社 吸収性物品
US20220354711A1 (en) * 2019-07-19 2022-11-10 Essity Hygiene And Health Aktiebolag Absorbent article
JP7331518B2 (ja) * 2019-07-23 2023-08-23 王子ホールディングス株式会社 吸収性物品

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CN105792785B (zh) 2019-11-19
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TWI660718B (zh) 2019-06-01

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