WO2023249001A1 - Procédé et appareil de fabrication d'un corps absorbant, et procédé de fabrication d'un article absorbant - Google Patents

Procédé et appareil de fabrication d'un corps absorbant, et procédé de fabrication d'un article absorbant Download PDF

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Publication number
WO2023249001A1
WO2023249001A1 PCT/JP2023/022711 JP2023022711W WO2023249001A1 WO 2023249001 A1 WO2023249001 A1 WO 2023249001A1 JP 2023022711 W JP2023022711 W JP 2023022711W WO 2023249001 A1 WO2023249001 A1 WO 2023249001A1
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WO
WIPO (PCT)
Prior art keywords
base material
compressed
forming
compression
absorbent body
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Application number
PCT/JP2023/022711
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English (en)
Japanese (ja)
Inventor
裕一 鈴木
夕里子 森実
Original Assignee
ユニ・チャーム株式会社
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Filing date
Publication date
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
Publication of WO2023249001A1 publication Critical patent/WO2023249001A1/fr

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    • 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

Definitions

  • the present invention relates to a method for manufacturing an absorbent body, an apparatus for manufacturing an absorbent body, and a method for manufacturing an absorbent article.
  • Patent Document 1 discloses a method for producing an absorbent body that is compressed by a compression forming section that includes a convex portion and a concave portion facing each other.
  • the base material of the absorbent body is formed by vertically covering the absorbent core material and the absorbent core material with a covering sheet.
  • compressed grooves are formed in the base material of the absorbent body by the convex portion provided on one of the pair of rolls facing each other and the concave portion provided on the other roll.
  • a compression groove is formed.
  • the compressed grooves are formed more strongly than in a general manufacturing method in which the base material of the absorbent body is compressed using convex portions facing parallel surfaces.
  • the base material of the absorbent body may be damaged when forming the compressed grooves.
  • the present invention has been made in view of such problems, and when forming compressed grooves by compressing the base material of the absorbent body between the sides of the convex portion and the side portion of the concave portion, the present invention Provided are an absorbent manufacturing method, an absorbent manufacturing device, and an absorbent article manufacturing method that can stabilize quality.
  • a method for producing an absorbent body is a method for producing an absorbent body having compressed grooves compressed by a compressed forming portion formed by a convex portion and a concave portion facing each other.
  • the manufacturing method includes a pressing step of forming the compressed grooves in the base material of the absorbent body by the convex portion provided on one roll of a pair of rolls facing each other and the recessed portion provided on the other roll. has.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the conveying direction while being compressed by at least the side compression forming section. A difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • An apparatus for producing an absorbent body is an apparatus for producing an absorbent body having compressed grooves.
  • the manufacturing device includes a pair of rolls facing each other, and a compression forming section configured with a convex portion and a recessed portion facing each other, and compresses the base material of the absorbent body.
  • the compression forming portion forms the compression groove in the base material using the convex portion provided on one roll of the pair of rolls and the recessed portion provided on the other roll.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the transport direction while being compressed by at least the side compression forming section. A difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • a method for manufacturing an absorbent article is a method for manufacturing an absorbent article including an absorbent body having compressed grooves compressed by a compressed forming portion formed of a convex portion and a recessed portion facing each other.
  • the manufacturing method includes a pressing step of forming the compressed grooves in the base material of the absorbent body by the convex portion provided on one roll of a pair of rolls facing each other and the recessed portion provided on the other roll. and has.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the conveying direction while being compressed by at least the side compression forming section. A difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • FIG. 1 is a plan view of an absorbent article according to an embodiment as viewed from the skin side.
  • FIG. 2 is a plan view of the absorbent article 1 according to the embodiment viewed from the non-skin side.
  • FIG. 3 is a schematic cross-sectional view of the absorbent article taken along line AA shown in FIG.
  • FIG. 4 is a schematic cross-sectional view of the absorbent article 1 in the range indicated by F4 in FIG.
  • FIG. 5 is a plan view of the absorbent body according to the embodiment as viewed from the skin side T1.
  • FIG. 6 is a schematic cross-sectional view for explaining a case where the absorbent core according to the embodiment receives a force directed inward in the width direction.
  • FIG. 7 is a schematic diagram for explaining the movement of the absorbent core when a wearer wears the absorbent article according to the embodiment.
  • FIG. 8 is a plan view of the absorbent body 30 according to the modified example, viewed from the skin side T1.
  • FIG. 9 is a schematic side view of a part of the manufacturing line for the absorbent article 1 according to the embodiment.
  • FIG. 10 is a schematic front view of the first compressing device 121 according to the embodiment.
  • FIG. 11 is a partially enlarged sectional view of the first compressing device 121 according to the embodiment.
  • FIG. 12 is a diagram for explaining the feeding speed of the base material 30B.
  • FIG. 13 is a partially enlarged cross-sectional view of the first compressing device 121 according to the first modification.
  • FIG. 14 is a partially enlarged sectional view of the first compression device 121 according to Modifications 2 and 3.
  • FIG. 15 is a diagram for explaining a convex portion C according to modification example 4.
  • FIG. 16 is a schematic front view of the first compression device 121 according to Modification Example 5.
  • the method for producing an absorbent body according to aspect 1 is a method for producing an absorbent body having compressed grooves compressed by a compressed forming portion formed of a convex portion and a concave portion facing each other.
  • the manufacturing method includes a pressing step of forming the compressed grooves in the base material of the absorbent body by the convex portion provided on one roll of a pair of rolls facing each other and the recessed portion provided on the other roll. has.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the conveying direction while being compressed by at least the side compression forming section.
  • a difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • the portion of the substrate that is delivered on one side of the side squeeze formation is transported relatively slowly, and the portion of the substrate that is delivered on the other side of the side squeeze formation is transported relatively quickly.
  • the relative speed difference causes a shift in the conveying direction within the substrate. Since the compressed portion has high rigidity, damage (particularly breakage) is likely to occur due to deviation in the conveyance direction.
  • the difference in the feeding speed of the base material on one side and the other side of the side compression forming part to within 5%, it is possible to distinguish between parts that are transported relatively quickly and parts that are transported relatively slowly. The deviation in the transport direction can be reduced.
  • the invention according to aspect 2 may have the following features in the invention according to aspect 1.
  • the shortest distance from the top of the convex portion to the bottom of the concave portion is longer than the shortest distance from the side of the convex portion to the bottom of the concave portion.
  • the forces that the base material receives from the tops of the convex portions and the bottoms of the recesses are relatively weaker than the forces that the base material receives from the side compression formations. Thereby, the force compressed by the side compression forming part can easily escape between the top of the convex part and the bottom of the concave part, and damage to the base material can be easily suppressed.
  • the rigidity between the top of the convex part and the bottom of the concave part can be lowered compared to the part compressed by the side compression forming part, and the wearer's Deterioration of skin texture can be reduced.
  • the invention according to aspect 3 may have the following features in the invention according to aspect 1 or 2.
  • a plurality of the compression forming portions are arranged at intervals in the cross direction.
  • the plurality of squeezed forming parts include a first squeezed forming part and a second squeezed forming part arranged adjacent to the first squeezed forming part in the intersecting direction.
  • the maximum difference between the feeding speed of the base material of the first compression forming section and the feeding speed of the base material of the second compression forming section is within 5%.
  • the invention according to aspect 4 may have the following features in the invention according to aspect 3.
  • the lower roll having a placement surface on which the base material is placed is the placement surface parallel to the intersecting direction, on which an end of the base material in the intersecting direction is placed.
  • the ends have parallel surfaces.
  • the maximum distance in the vertical direction based on the end parallel plane of each of the side squeeze forming parts of the plurality of squeeze forming parts is 5 of the radial distance from the rotation axis of the lower roll to the end parallel plane. % or less. The farther the side compressed forming part is from the end parallel surface in the vertical direction, the larger the difference between the feeding speed of the base material at the side compressed forming part and the base material feeding speed at the end parallel surface becomes larger.
  • the maximum distance of the side compression forming parts By setting the maximum distance of the side compression forming parts to 5% or less of the above-mentioned radial distance, it is possible to reduce the difference in the feeding speed of the base material of each side compression forming part. As a result, damage to the base material due to misalignment in the conveyance direction within the base material can be suppressed.
  • the invention according to aspect 5 may have the following features in the invention according to aspect 3 or 4.
  • the interval between the plurality of compressed forming portions in the cross direction is equal to or greater than the height of the convex portion in the vertical direction. Since the force applied between the plurality of squeeze-formed parts is not concentrated on a local part of the base material but is dispersed over a wide range in the cross-direction, the unit length in the cross-direction between the plurality of squeeze-formed parts is It is possible to reduce the deviation in the conveying direction of the hit. It is possible to reduce the concentration of load on a local portion of the base material located between the plurality of compression forming parts, and it is possible to suppress damage to the base material occurring between the plurality of compression forming parts.
  • the invention according to aspect 6 may have the following features in the invention according to any one of aspects 3 to 5.
  • the lower roll of the pair of rolls has a mounting surface on which the base material is mounted.
  • a central region located at the center of the placement surface divided into five equal parts in the intersecting direction is provided.
  • any one of the plurality of squeezing forming parts squeezes the base material in the central region.
  • the squeezing and forming part that squeezes the base material in the central region can press the base material in the central region, and can suppress displacement of the center of the base material in the cross direction. As a result, it is possible to suppress squeezing at a position different from the intended position due to positional deviation of the base material.
  • the invention according to aspect 7 may have the following features in the invention according to any one of aspects 3 to 5.
  • the lower roll of the pair of rolls has a mounting surface on which the base material is mounted.
  • a central region located at the center when the placement surface is divided into five equal parts in the cross direction, and side regions located on both sides of the central region in the cross direction are provided.
  • the plurality of squeezing forming parts squeeze the base material in the side regions without squeezing the base material in the central region. Since the end of the base material located in the side region that is far from the center region is a free end, the force due to compression can be easily released at the end.
  • the invention according to aspect 8 may have the following features in the invention according to any one of aspects 3 to 7.
  • the one roll has the convex portion of the first compressed forming portion and the recessed portion of the second compressed forming portion.
  • the other roll has the recessed portion of the first compression forming portion and the convex portion of the second compression forming portion.
  • the convex part of the first compression forming part of one roll squeezes the base material from one side in the vertical direction
  • the convex part of the second compression forming part of the other roll squeezes the base material from the other side in the vertical direction. do.
  • the invention according to aspect 9 may have the following features in the invention according to any one of aspects 3 to 8.
  • an intermediate surface that is placed between the first compression forming part and the second compression forming part and facing the base material has an inclined mounting surface that is inclined with respect to the intersecting direction.
  • the length of the intermediate plane can be increased by the height due to the inclination.
  • the invention according to aspect 10 may have the following features in the invention according to any one of aspects 3 to 9.
  • a non-squeezing forming section that conveys the base material without squeezing it is provided on both sides of the pressing forming section in the cross direction.
  • the non-squeezed forming part is a parallel extending surface extending in parallel to the intersecting direction from an end of the squeezing forming part in the intersecting direction. has. Since the base material portion on the parallel extending surface has a constant distance from the rotation axis of the lower roll, the feeding speed of the base material portion is constant.
  • the invention according to aspect 11 may have the following features in the invention according to aspect 10.
  • a plurality of the compression forming portions are arranged at intervals in the cross direction.
  • the plurality of compressed forming parts include a first compressed forming part and a second compressed forming part arranged adjacent to the first compressed forming part in the intersecting direction.
  • the non-squeezed forming part is provided between the first pressed and formed part and the second pressed formed part. In the lower roll, the non-squeezed forming part is disposed between the first pressed and formed part and the second pressed formed part, and has an intermediate surface facing the base material.
  • the intermediate surface has the parallel extending surface and an axis-side parallel surface that is closer to the rotation axis of the lower roll than the parallel extending surface and extends in the intersecting direction.
  • the average distance in the vertical direction from the shaft-side parallel surface to the upper roll of the pair of rolls is longer than the average distance in the vertical direction from the parallel extending surface to the upper roll.
  • the distance between the upper roll and the lower roll is greater than on the parallel extending plane, and the base material can easily move in the vertical direction on the intermediate plane.
  • the invention according to aspect 12 may have the following features in the invention according to any one of aspects 1 to 11.
  • a plurality of small protrusions protruding in the vertical direction are arranged at intervals in the conveying direction on the top of the convex part.
  • the small protrusion extends in the cross direction while being inclined with respect to the conveyance direction.
  • the small protrusion overlaps the small protrusion adjacent to the small protrusion in the cross direction.
  • the invention according to aspect 13 may have the following features in the invention according to any one of aspects 1 to 12.
  • the method for manufacturing an absorbent body includes, after the pressing step, a cutting step of cutting the base material so as to divide the base material in the transport direction.
  • the base material before being divided is less likely to move when forming the compressed grooves than the cut base material. Therefore, it is possible to easily form compressed grooves at targeted positions, and the quality of the absorbent body can be stabilized.
  • the method for manufacturing an absorbent body includes a cutting step of cutting the base material so as to divide the base material in the transport direction.
  • the pressing step the pressing grooves are formed in the cut base material.
  • force is applied to the base material when cutting the base material, causing the base material to expand and contract. Due to expansion and contraction of the base material, the degree of compression formed on the base material tends to weaken.
  • by forming compression grooves in the cut base material it is possible to prevent the degree of compression from becoming weaker due to the cutting process. The intended compression can be achieved and the quality of the absorbent body can be stabilized.
  • the invention according to aspect 15 may have the following features in the invention according to any one of aspects 1 to 14.
  • Each of the pair of rolls has a plurality of roll parts divided in the cross direction. At least one of the compressed forming parts is arranged in each of the plurality of roll parts.
  • the rotational speed of each of the plurality of roll parts is controlled so that the difference in feeding speed of the base material is within 5%.
  • the feeding speed of the base material changes depending on the height of the top of the protrusion of the plurality of compression forming parts, so the height of the protrusion is limited.
  • the height of the convex part is not limited, and the difference in the feeding speed of the base material can be kept within 1%, which eliminates the difference caused by misalignment in the conveyance direction. Damage to the base material can be suppressed.
  • the invention according to aspect 16 may have the following features in the invention according to any of aspect 15.
  • the base material can be removed from both sides in the vertical direction. can no longer be pressed down, and the force applied to the base material between these compression forming parts tends to escape. Thereby, damage to the base material between these compression forming parts can be suppressed.
  • the absorbent body manufacturing apparatus is an absorbent body manufacturing apparatus having compressed grooves.
  • the manufacturing device includes a pair of rolls facing each other, and a compression forming section configured with a convex portion and a recessed portion facing each other, and compresses the base material of the absorbent body.
  • the compression forming portion forms the compression groove in the base material using the convex portion provided on one roll of the pair of rolls and the recessed portion provided on the other roll.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the transport direction while being compressed by at least the side compression forming section.
  • a difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • a method for manufacturing an absorbent article according to aspect 18 is a method for manufacturing an absorbent article including an absorbent body having compressed grooves compressed by a compressed forming portion formed of a convex portion and a recessed portion facing each other.
  • the manufacturing method includes a pressing step of forming the compressed grooves in the base material of the absorbent body by the convex portion provided on one roll of a pair of rolls facing each other and the recessed portion provided on the other roll. and has.
  • the compression forming portion has a side compression forming portion that is a portion of the side portion of the convex portion and the side portion of the recess that compresses the base material.
  • the base material is sent out in the conveying direction while being compressed by at least the side compression forming section.
  • a difference between the feeding speed of the base material on one side of the side compression forming section in the vertical direction and the feeding speed of the base material on the other side is within 5%.
  • the absorbent article 1 according to the embodiment will be described below with reference to the drawings.
  • the same or similar parts are given the same or similar symbols.
  • the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, specific dimensions etc. should be determined with reference to the following explanation.
  • the drawings may include portions with different dimensional relationships and ratios.
  • the absorbent article 1 may be an absorbent article such as a sanitary napkin, a panty liner, an incontinence pad, a fecal pad.
  • the absorbent article may be an article that is used by being attached to the inside of a wearing article such as underwear.
  • the absorbent article 1 of the embodiment is a sanitary napkin for daytime use.
  • the same or similar parts are given the same or similar symbols.
  • the drawings are schematic and the ratio of each dimension may differ from the actual one. Therefore, specific dimensions etc. should be determined with reference to the following explanation.
  • the drawings may include portions with different dimensional relationships and ratios.
  • FIG. 1 is a plan view of the absorbent article 1 viewed from the skin side T1.
  • FIG. 2 is a plan view of the absorbent article 1 viewed from the non-skin side T2.
  • FIG. 3 is a schematic cross-sectional view taken along line AA shown in FIG.
  • the "skin side” corresponds to the side facing the wearer's skin during use.
  • “Non-skin side” corresponds to the side that is turned away from the wearer's skin during use.
  • the absorbent article 1 has a front-back direction L, a width direction W, and a thickness direction T that are orthogonal to each other.
  • the front-rear direction L of the absorbent article 1 the side that contacts the wearer's lower abdomen is referred to as the "front side", and the side that contacts the wearer's buttocks is referred to as the "rear side”.
  • the absorbent article 1 has a front region, a central region, and a rear region.
  • the central region S2 is arranged between the front region S1 and the rear region S3.
  • the central region S2 may include a region facing the wearer's excretory opening, for example, the vaginal opening.
  • the central region S2 may be a region located at the crotch of the wearing article and between the wearer's legs.
  • the central region S2 extends from the frontmost front edge (specifically, the front root) of the wing 7 to the rearmost rear edge (specifically, The area may extend up to the base of the rear side.
  • the central region S2 is the first region from the front. and the second fold.
  • the central region S2 may be a central region of three equal parts of the absorbent article 1 in the front-rear direction L when the absorbent article 1 does not have the wings 7 in any other state.
  • the front side area S1 is located in front of the central area S2.
  • the front edge of the front side region S1 defines the front edge of the absorbent article 1.
  • the rear side area S3 is located further back than the central area S2.
  • the rear edge of the rear region S3 defines the rear edge of the absorbent article 1.
  • the absorbent article 1 has at least an absorbent core 31, a top sheet 10, and a back sheet 20.
  • the absorbent article 1 has a vertically long shape.
  • the top sheet 10 is a sheet that is placed closer to the skin surface T1 than the absorbent core 31 and comes into contact with the wearer.
  • the top sheet 10 includes a center sheet 11 that covers the center of the absorbent core 31 in the width direction W, and a side sheet 12 that is arranged outside the center sheet 11 in the width direction W and is arranged at least in the wing 7 described later. may have.
  • the side seat 12 only needs to have a portion disposed further in the width direction W than the center seat 11, and may overlap with the outer side of the center seat 11.
  • the side sheet 12 has a portion disposed outside the absorbent core 31 in the width direction W, and is spaced apart from the absorbent core 31 in the width direction W in this embodiment.
  • the center sheet 11 is made of any sheet-like material having a liquid-permeable structure, such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, a mesh sheet, or the like.
  • the side sheet 12 may have hydrophobicity.
  • the material of the side sheet 12 may be the same as that of the center sheet 11.
  • the center seat 11 and the side seats 12 may be joined by a seat joint.
  • the sheet joint portion may be configured by a compressed portion that compresses the center sheet 11 and the side sheets 12, and may be configured to be visible from the skin side T1 of the absorbent article 1.
  • the seat joint part may be constituted by an aggregate of dotted compressed parts, and more specifically, it is constituted by an aggregate of dotted compressed parts arranged in a diamond shape, and the rhombuses are lined up in the front-rear direction L. good.
  • the seat joint portion may extend in the front-rear direction L.
  • the back sheet 20 is a sheet that is placed on the non-skin surface side T2 relative to the absorbent core 31 and the fiber sheet 50 and comes into contact with the worn article.
  • the back sheet 20 is a liquid-impermeable sheet.
  • the back sheet 20 can be made of, for example, a non-breathable resin film.
  • the absorbent core 31 constitutes the absorbent body 30.
  • the absorbent core 31 may be constructed of an absorbent material that absorbs liquid.
  • the absorbent material constituting the absorbent core 31 can be formed from, for example, hydrophilic fibers, pulp, and super absorbent polymers (SAP).
  • SAP super absorbent polymers
  • the absorbent core 30 may include a core wrap sheet 32 that covers the absorbent core 31.
  • the core wrap sheet 32 can be made of, for example, nonwoven fabric or tissue. As a modification, the absorbent core 31 may not be covered by the core wrap sheet 32.
  • the absorbent article 1 has wings 7. When worn, the wings 7 are folded back toward the non-skin side T2 of the worn article about the wing crease FL. At least a top sheet 10 and a back sheet 20 may be arranged on the wing 7.
  • the wing crease FL is defined by the base of the wing 7, and is a line connecting the front part and the rear part of the two parts recessed inward in the width direction W.
  • the wings 7 are folded toward the top sheet 10 before use, and may be folded back toward the non-skin side T2 of the wearing article when used.
  • a reinforcing sheet 15 disposed between the top sheet 10 and the back sheet 20 may be disposed on the wing 7 .
  • the term “along the front-back direction L” means a direction with an angle of less than 45 degrees with respect to the front-back direction L
  • the term “along the width direction W” It means a direction having an angle of less than 45° with respect to the width direction W.
  • the absorbent article 1 has an adhesive part for fixing the absorbent article 1 to a wearing article such as underwear.
  • the adhesive portion is provided on the non-skin surface side T2 of the backsheet 20, and is a region provided with a fastening means for fastening the absorbent article 1 to a wearing article such as underwear.
  • the adhesive portion includes a main body adhesive portion 61 for fixing at least a region overlapping with the absorbent core 31 to the wearing article.
  • the main body adhesive part 61 is provided in a region overlapping with the absorbent core 31 in the thickness direction T of the absorbent article 1 .
  • the adhesive portion may include a wing adhesive portion 62 for fixing the wing 7 to a wearing article.
  • the wing adhesive portion 62 is attached to the non-skin surface of the wing 7, and is fixed to the non-skin surface of the wearable article when the wing 7 is folded back to the non-skin side T2 of the wearable article when worn.
  • FIG. 4 is a schematic cross-sectional view of the absorbent article 1 in the range indicated by F4 in FIG.
  • the top sheet 10 and the back sheet 20 are joined so as to follow the shape of the absorber 30.
  • FIG. 5 is a plan view of the absorbent body 30 viewed from the skin side T1.
  • the 1st compression groove 41, the 2nd compression groove 42, and the 3rd compression groove 43 mentioned later are illustrated, and illustration of the other compression parts of the absorber 30 is abbreviate
  • FIG. 5 is a schematic cross-sectional view of the absorbent article 1 in the range indicated by F4 in FIG.
  • the top sheet 10 and the back sheet 20 are joined so as to follow the shape of the absorber 30.
  • FIG. 5 is a plan view of the absorbent body 30 viewed from the skin side T1.
  • the 1st compression groove 41, the 2nd compression groove 42, and the 3rd compression groove 43 mentioned later are illustrated, and illustration of the other compression parts of the absorber 30 is abbreviate
  • FIG. 6 is a schematic cross-sectional view for explaining a case where the absorbent core 31 receives a force directed inward in the width direction.
  • FIG. 7 is a schematic diagram for explaining the movement of the absorbent core 31 when the wearer WA wears the absorbent article 1.
  • the absorbent core 31A shows an example of the state of the absorbent core 31 when the absorbent article 1 is attached to a wearing article (not shown), and the absorbent core 31B shows an example of the state of the absorbent core 31 when the absorbent article 1 is attached to the wearing article.
  • the absorbent core 31C shows an example of the state of the absorbent core 31 that has been slightly pulled up, and the absorbent core 31C shows an example of the state of the absorbent core 31 that has been pulled up slightly toward the crotch of the absorbent article 1 attached to the wearing article and is located directly below the crotch. An example is shown.
  • the absorbent core 31 includes a first absorbent core section 311, a second absorbent core section 312, and a third absorbent core section 313.
  • the first absorbent core portion 311 is a portion located on the non-skin surface side T2 of the first compressed groove 41, which will be described later.
  • the first absorbent core portion 311 is a portion that overlaps the first compressed groove 41 in the thickness direction T.
  • the first absorbent core portion 311 overlaps at least the bottom surface 41b of the first compressed groove 41 in the thickness direction T. For example, when the side portions of the first compressed grooves 41 are inclined with respect to the thickness direction T, the first absorbent core portion 311 overlaps the side portions of the first compressed grooves 41 in the thickness direction T.
  • the second absorbent core portion 312 is a portion located on the non-skin surface side T2 of the second compressed groove 42, which will be described later.
  • the second absorbent core portion 312 is a portion that overlaps the second compressed groove 42 in the thickness direction T.
  • the second absorbent core portion 312 overlaps at least the bottom surface 42b of the second compressed groove 42 in the thickness direction T. For example, when the side portions of the second compressed grooves 42 are inclined with respect to the thickness direction T, the second absorbent core portion 312 overlaps the side portions of the second compressed grooves 42 in the thickness direction T.
  • the third absorbent core portion 313 is a portion located on the skin side T1 of the third compressed groove 43, which will be described later.
  • the third absorbent core portion 313 is a portion that overlaps the third compressed groove 43 in the thickness direction T.
  • the third absorbent core portion 313 overlaps at least the bottom surface 43b of the third compressed groove 43 in the thickness direction T. For example, when the side portions of the third compressed grooves 43 are inclined with respect to the thickness direction T, the third absorbent core portion 313 overlaps the side portions of the third compressed grooves 43 in the thickness direction T.
  • the absorbent core 31 has a non-squeezed portion 35 that is a part of the absorbent core 31 and is spaced apart from the squished groove 40 in the width direction W.
  • the non-squeezed portion 35 is constituted by a portion of the absorbent core 31 that is not squeezed.
  • the thickness of the side part (especially the side part on the bottom side of the pressed groove 40) which constitutes the side wall of the pressed groove 40 in the width direction W is also affected by compression. changes, the non-squeezed portion 35 is constituted by a portion that is at least 3 mm or more away from the squished groove 40 in the width direction W.
  • the absorbent core 31 includes at least a high basis weight region HWR disposed in a central front region to be described later, and a high basis weight region HWR that is lower in basis weight than the high basis weight region HWR. and a low basis weight region LWR disposed outside in the front-rear direction L.
  • the high basis weight region HWR may be arranged in the central region S2.
  • the high basis weight region HWR may be a region sandwiched between a pair of first compressed grooves 41 in the width direction W.
  • the low basis weight region LWR may be arranged in the front region S1 and the rear region S3.
  • the low basis weight region LWR may be a region outside the pair of first compressed grooves 41 in the width direction W. Therefore, the high basis weight region HWR may be sandwiched between the low basis weight regions LWR in the width direction W.
  • the central region S2 may have a central front region including a region in front of the center of the central region S2 in the longitudinal direction L.
  • the central front region may be constituted by the first and second regions from the front of the central region S2 divided into three in the front-rear direction L.
  • the central front region may be constituted by the central region of the absorbent core 31 divided into three in the width direction W.
  • the central anterior region may be the region facing the wearer's vaginal opening.
  • the high basis weight region HWR may be arranged at least in the central front region.
  • the absorbent article 1 has compressed grooves 40. At least the absorbent core 31 is compressed in the thickness direction T, and the compression groove 40 extends in the front-rear direction L.
  • the compressed groove 40 is arranged at least in the central region S2.
  • the compressed groove 40 includes a pair of first compressed grooves 41 , a pair of second compressed grooves 42 , and a third compressed groove 43 .
  • the pair of first compression grooves 41 are arranged so that at least the absorbent core 31 is compressed from the skin side T1 to the non-skin side T2 and sandwich the center of the absorbent core 31 in the width direction W.
  • the pair of second compression grooves 42 are arranged so that at least the absorbent core 31 is compressed from the skin side T1 to the non-skin side T2, and are arranged outside the pair of first compression grooves 41 in the width direction of the absorbent article 1.
  • the third compressed groove 43 is arranged so that at least the absorbent core 31 is compressed from the skin side T1 to the non-skin side T2, and between the pair of first compressed grooves 41 in the width direction W.
  • the non-skin surface 311n of the first absorbent core section 311 is located on the non-skin surface side T2 from the non-skin surface 35n of the non-squeezed portion 35, and the second absorbent core section 311 It is located on the non-skin surface side T2 from the non-skin surface 312n. Therefore, the first absorbent core part 311 is located on the non-skin side T2 of the inner absorbent core part IAC, which is the absorbent core 31 between the pair of first compressed grooves 41.
  • non-skin surface 311n of the first absorbent core portion 311 may be located closer to the non-skin surface side T2 than the non-skin surface 35n of one non-squeezed portion 35 at least in the width direction W.
  • the non-skin surface 311n of the first absorbent core section 311 may be located closer to the non-skin surface side T2 than the non-skin surface 312n of the second absorbent core section 312 on the outside in the width direction W.
  • the positions of each non-skin surface can be compared by the following method. After impregnating the absorbent article 1 as a sample in liquid nitrogen and freezing it, the absorbent article 1 is cut with a razor so that a cross section along the thickness direction T and the width direction W is obtained. 1, a cross section is obtained in plan view. Next, the sample is returned to room temperature, and a cross-sectional image at 50x magnification is obtained using an electron microscope (eg, Keyence VE7800).
  • an electron microscope eg, Keyence VE7800
  • the non-skin surface 35n of the non-squeezed portion 35 to be compared with the non-skin surface 311n of the first absorbent core portion 311 is, for example, a portion located within a range of 3 mm or more and 10 mm or less from the first compressed groove 41 in the width direction W. It may be the non-skin surface 35n of the part that is not compressed.
  • the non-skin surface 35n of the non-squeezed portion 35 to be compared with the non-skin surface 312n of the second absorbent core portion 312 is, for example, a portion located within a range of 3 mm or more and 10 mm or less from the second compressed groove 42 in the width direction W. It may be the non-skin surface 35n of the unpressed portion.
  • the first absorbent core portion 311 is located on the non-skin side T2 than the non-squeezed portion 35 on the outside in the width direction, so that the component on the inside in the width direction and the non-skin side T2 direction A force f1 having a component of is received from the unsqueezed portion 35.
  • the first absorbent core section 311 is moved inward in the width direction while being moved toward the non-skin side T2 direction.
  • the first absorbent core portion 311 applies force f2 to the non-squeezed portion 35 on the inner side in the width direction.
  • the first absorbent core portion 311 is located on the non-skin surface side T2 than the non-skin surface 35n of the non-squeezed portion 35 on the inner side in the width direction.
  • a force f2 having a component of , and a component in the skin surface side T1 direction is applied. Therefore, as shown in FIG. 6(C), the first absorbent core section 311 easily pushes up the non-squeezed portion 35 on the inner side in the width direction, that is, the inner absorbent core section IAC from the non-skin side T2 to the skin side T1.
  • FIG. 7 See absorbent core 31A and absorbent core 31B in FIG. 7).
  • the inner absorbent core portion IAC can be easily raised toward the skin side T1, and the center of the absorbent article 1 in the width direction W can be fitted to the excretory opening E of the wearer WA. (See absorbent core 31C in FIG. 7).
  • the non-skin surface 311n of the first absorbent core section 311 is located closer to the non-skin surface side T2 than the non-skin surface 312n of the second absorbent core section 312, at least a part of the first absorbent core section 311 (specifically Specifically, a portion of the first absorbent core section 311 located closer to the non-skin surface side T2 than the non-skin surface 312n) is located further toward the non-skin surface side T2 compared to the second absorbent core section 312. . Therefore, when the absorbent core 31 receives a force F directed inward in the width direction, the first absorbent core part 311 more easily pushes up the absorbent core 31 on the inner side in the width direction than the second absorbent core part 312. As a result, the absorbent core 31 becomes easier to deform with the first compressed groove 41 as a base point than the second compressed groove 42, and the intended deformation of the absorbent core 31 can be realized.
  • the second pressing groove 42 is arranged outside the first pressing groove 41 in the width direction W. Therefore, when the absorbent core 31 receives the force F directed inward in the width direction, the width of the absorbent core 31 between the first compressed groove 41 and the second compressed groove 42 can be suppressed. As a result, the absorbent core 31 on the outer side in the width direction of the first compression groove 41 serving as the deformation reference point is less likely to widen, and lateral leakage of excrement can be suppressed. In this way, it is possible to achieve both a fit in the widthwise center of the absorbent article 1 and suppression of lateral leakage of excrement.
  • the first compression groove 41 may extend linearly along the front-rear direction L. At least a portion of the first compressed groove 41 located in the central region S2 may extend linearly in the front-rear direction L.
  • the first compression groove 41 Force is not concentrated locally in the groove 41, but is likely to be applied to the entire first compression groove 41.
  • the inner absorbent core portion IAC can be easily raised toward the skin side T1 over a wide range, and the intended deformation of the absorbent core 31 can be realized.
  • the first compressed groove 41 may extend continuously or intermittently from the front edge to the rear edge of the absorbent core 31.
  • the first compressed groove 41 extends continuously from the front edge to the rear edge of the absorbent core 31.
  • the first absorbent core portion 311 it becomes easier to receive the force F directed inward in the width direction.
  • the inner absorbent core portion IAC can be easily raised toward the skin side T1, and the intended deformation of the absorbent core 31 can be realized.
  • the first compression groove 41 may extend from the high basis weight region HWR to the low basis weight region LWR.
  • the first compressed groove 41 extends from the high basis weight region HWR to the low basis weight region LWR of the front side region S1.
  • the 1st compression groove 41 is extended from the high basis weight area
  • the first compressed grooves 41 are separated from the high basis weight region HWR. It can be provided so as to extend to the low basis weight region LWR of the rear side region S3. Since the absorbent core 31 continues to be compressed, the position of the absorbent core 31 is stabilized, the first compressed grooves 41 can be stably provided, and deterioration in quality can be suppressed.
  • the length of the first compressed groove 41 may be longer than the length of the wing 7. Further, in the front-rear direction L, the length of the first compressed groove 41 may be longer than the length of the second compressed groove 42. In the front-rear direction L, the first compression grooves 41 are arranged in a wider range than the second compression grooves 42. Further, the portion of the first compressed groove 41 where the second compressed groove 42 is not located outside in the width direction W becomes more susceptible to the force F directed inward in the width direction. Therefore, the inner absorbent core portion IAC can be easily raised toward the skin side T1 over a wide range, and the intended deformation of the absorbent core 31 can be realized.
  • the first compressed groove 41 may overlap the main body adhesive part 61 in the thickness direction T.
  • the body adhesive part 61 located on the non-skin side T2 of the first absorbent core part 311 makes it difficult for the first absorbent core part 311 to move toward the non-skin side T2, so the inner absorbent core part IAC is moved to the skin side by that much. It can be easily raised to the side T1.
  • An inner region IR located between the ORs may be provided.
  • the first compressed groove 41 may be located in the inner region IR.
  • the inner region IR corresponds to two portions of the absorbent core 31 divided into four equal parts in the width direction W. Since the first compressed grooves 41 are located in the inner region IR, the width of the inner absorbent core portion IAC, which is the absorbent core 31 between the first compressed grooves 41, is less than half the width of the absorbent core 31.
  • the inner absorbent core part IAC that protrudes toward the skin side T1 can be made smaller, and the first compressed groove 41 is the base point.
  • the range in which the absorbent core 31 deforms does not become large. Excessive deformation of the absorbent core 31 can be prevented, making it difficult for the wearer to feel uncomfortable.
  • the inner absorbent core portion IAC is small, it can easily fit into the wearer's crotch. As a result, the inner absorbent core portion IAC can be brought closer to the wearer's excretion opening. Furthermore, it is possible to secure a wider area outside the first compressed groove 41 in the width direction, which is the deformation reference point. As a result, side leakage of excrement can be suppressed.
  • the width W1 of the first compressed groove 41 may be wider than the thickness T5 of the non-pressed portion 35.
  • the bottom surface 41b of the first compressed groove 41 is constituted by the core wrap sheet 32.
  • the bottom surface 41b of the first compressed groove 41 may be constituted by the absorbent core 31.
  • the top sheet 10 is not compressed in the first compressed groove 41 . Therefore, since the top sheet 10 is not compressed, the bottom surface 41b of the first compressed groove 41 is not formed by the top sheet 10.
  • the rigidity of the unpressed portion of the top sheet 10 is lower than that of the compressed portion, so even if the top sheet 10 on the first compressed groove 41 touches an excretory opening (e.g. vaginal opening), it cannot be worn. This can make it difficult for people to feel uncomfortable.
  • an excretory opening e.g. vaginal opening
  • the depth D1 of the bottom surface 41b of the first compressed groove 41 in the high basis weight region HWR may be deeper than the depth D1 of the bottom surface 41b of the first compressed groove 41 in the low basis weight region LWR.
  • the inner absorbent core part IAC can be made less likely to be hit locally, making it less likely that the wearer will feel uncomfortable.
  • the depth D1 of the bottom surface 41b of the first compressed groove 41 is determined from the opening edge of the first compressed groove 41 to the bottom surface 41b (in the embodiment, the core wrap on the skin side T1 of the absorbent core 31). This is the distance in the thickness direction T to the skin surface of the sheet 32.
  • the first compression groove 41 may be arranged at the boundary between the high basis weight region HWR and the low basis weight region LWR.
  • the absorbent core 31 in the high basis weight region HWR has higher rigidity than the absorbent core 31 in the low basis weight region LWR, so a difference in rigidity occurs with the first compressed groove 41 as a boundary, and the first compressed groove 41 It can be easily deformed using the base point.
  • the bottom surface 41b of the first compressed groove 41 may be located closer to the non-skin surface side T2 than the non-skin surface 35n of the non-squeezed portion 35.
  • the entire first absorbent core section 311 is located on the non-skin surface side T2 of the inner absorbent core section IAC of the non-compressed portion 35. Therefore, when the first absorbent core part 311 moves inward in the width direction in response to the force F directed inward in the width direction, it becomes easier to further push up the inner absorbent core part IAC from the non-skin side T2 to the skin side T1. As a result, the inner absorbent core portion IAC can be easily raised toward the skin side T1.
  • the bottom surface 41b of the first compressed groove 41 may be located closer to the non-skin surface side T2 than the non-skin surface of the core wrap sheet 32 portion that is in contact with the non-skin surface 35n of the non-squeezed portion 35 in the thickness direction T.
  • the second compressed groove 42 may be constituted by an aggregate of a plurality of point-shaped compressed parts. Specifically, in the second compressed groove 42, a plurality of dotted compressed portions may be arranged adjacent to each other (for example, within 3 mm). Thereby, in a plan view of the absorbent article 1, the portion recessed from the skin side to the non-skin side may linearly extend in the front-rear direction L as the second compressed groove 42.
  • the second compressed groove 42 may be configured by a continuously extending compressed portion. Specifically, the second compressed groove 42 may be configured by a continuously compressed portion extending in the front-rear direction L.
  • the second compressed groove 42 may extend in a curved shape.
  • the second compression groove 42 extends linearly along the front-rear direction L, the position of the innermost inner edge of the second compression groove 42 and the outermost edge of the second compression groove 42 in the width direction W are changed.
  • the distance in the width direction from the position of the outer edge becomes longer. Therefore, the length in the width direction of the second compressed groove 42 can be ensured, and the width of the absorbent core 31 can be suppressed by the length in the width direction compared to the linear second compressed groove 42.
  • the second compressed groove 42 is annular in plan view of the absorbent article 1.
  • each of the pair of second compressed grooves 42 has an arc shape.
  • the second compressed groove 42 may be linear.
  • the distance in the width direction W between the first compressed groove 41 and the second compressed groove 42 is relatively long on the center side in the front-back direction L, and the distance in the width direction W between the first compressed groove 41 and the second compressed groove 42 is relatively long, and The distance between the compressed groove 41 and the second compressed groove 42 in the width direction W is relatively short.
  • the force directed inward in the width direction W is strong, so the absorbent core 31 tends to enter the width. Entry can be suppressed.
  • the pair of first pressing grooves 41 are arranged inside the annular second pressing groove 42, so that the second pressing groove is located outside the pair of first pressing grooves 41 in the width direction W. 42 are arranged.
  • the second compressed groove 42 that overlaps with the central front region in the width direction W may be located in each of the pair of outer regions OR. That is, in the outer region OR, the second compressed groove 42 may be located on the outer side in the width direction W than the central front region.
  • the portion of the second compressed groove 42 disposed in the outer region OR can suppress the occurrence of widening of the absorbent core 31 in the outer region OR. Since the outer region OR is located on the outer side in the width direction than the inner region IR, it is possible to make it difficult for the absorbent core 31 on the width direction outer side than the first compressed groove 41, which is the deformation reference point, to be widened.
  • a wide area for absorbing excrement can be secured on the widthwise outer side of the central front region where excrement tends to leak.
  • the second compressed groove 42 may be arranged in the outer region OR or in the inner region IR.
  • the bottom surface 42b of the second compressed groove 42 is constituted by the top sheet 10.
  • the bottom surface 42b of the second compression groove 42 may be formed of the absorbent core 31 or the core wrap sheet 32 by tearing the top sheet 10 by compression.
  • the bottom surface 42b of the second compressed groove 42 may be located closer to the skin surface side T1 than the non-skin surface 35n of the non-squeezed portion 35. Thereby, at least a portion of the second absorbent core portion 312 is located closer to the skin surface side T1 than the non-compressed portion 35.
  • the second absorbent core section 312 When receiving force F directed inward in the width direction, the absorbent core 31 between the first compressed groove 41 and the second compressed groove 42 is easily moved in the direction from the skin side T1 to the non-skin side T2. .
  • the first absorbent core portion 311 is more likely to receive the force f1 in the direction from the skin side T1 to the non-skin side T2, and the absorbent core 31 is more likely to be exposed to the first compressed groove 41 than the second compressed groove 42. It becomes easier to deform as a base point, and the intended deformation of the absorbent core 31 can be realized.
  • the third compressed groove 43 at least the absorbent core 31 is compressed from the non-skin side T2 to the skin side T1 in the embodiment. Further, the third compressed groove 43 is arranged between the pair of first compressed grooves 41 in the width direction W. As a result, when the third absorbent core portion 313 receives a force directed inward in the width direction, it moves more easily toward the skin side T1 than the non-compressed portion 35, and the inner absorbent core portion The portion IAC can be easily raised toward the skin side T1 (see FIG. 7). As a result, it becomes easier to fit the inner absorbent core portion IAC to the excretion port E.
  • the skin surface 313s of the third absorbent core portion 313 may be located closer to the skin surface side T1 than the skin surface 35s of the non-squeezed portion 35.
  • the portion of the third absorbent core portion 313 located on the skin side T1 from the skin surface 35s of the non-squeezed portion 35 is separated from the non-skin surface side T2 of the non-squeezed portion 35 adjacent to the third absorbent core portion 313. Since the third absorbent core portion 313 receives a force in the direction of pushing up toward the skin side T1, the third absorbent core portion 313 becomes easier to move toward the skin side T1.
  • the inner absorbent core portion IAC can be easily raised toward the skin side T1 with the third compressed groove 43 as the apex, and the intended deformation of the absorbent core 31 can be realized.
  • the positional relationship between the skin surface 313s of the third absorbent core portion 313 and the skin surface 35s of the non-squeezed portion 35 can be evaluated visually using an electron microscope (for example, Keyence VE7800), as described above.
  • the non-skin surface 35n of the non-squeezed portion 35 is a portion located within a range of at least 3 mm or more and 10 mm or less from the third compressed groove in the width direction W, and is a non-skin surface 35n of the non-squeezed portion.
  • the depth D3 of the bottom surface 43b of the third compression groove 43 may be deeper than the depth D1 of the bottom surface 41b of the first compression groove 41.
  • the absorbent core 31 becomes easier to deform in the third compressed groove 43 than in the first compressed groove 41.
  • the inner absorbent core part IAC can be easily raised toward the skin surface side T1 with the third compressed groove 43 at the apex, and the inner absorbent core part IAC can be easily fitted to the excretory opening E.
  • FIG. 4 the depth D3 of the bottom surface 43b of the third compression groove 43 may be deeper than the depth D1 of the bottom surface 41b of the first compression groove 41.
  • the depth D3 of the bottom surface 43b of the third compressed groove 43 is determined from the opening edge of the third compressed groove 43 to the bottom surface 43b (in the embodiment, the core on the non-skin side T2 of the absorbent core 31). This is the distance in the thickness direction T to the non-skin surface of the wrap sheet 32.
  • the third compressed groove 43 does not need to overlap the main body adhesive part 61 in the thickness direction T. Thereby, movement of the third absorbent core part 313 toward the skin side T1 is not inhibited by the body adhesive part 61, and the third absorbent core part 313 can easily move toward the skin side T1. As a result, the inner absorbent core portion IAC can be easily raised toward the skin side T1 with the third compressed groove 43 as the apex.
  • the absorbent core 31 and the core wrap sheet 32 are compressed in the first compressed groove 41 and the third compressed groove 43.
  • the top sheet 10 is not compressed in the first compression groove 41 and the third compression groove 43. Therefore, in the first compression groove 41 and the third compression groove 43, at least the absorbent core 31 is compressed without the top sheet 10 being compressed.
  • the first compressed groove 41 is formed so that the non-skin surface 311n of the first absorbent core part 311 is located on the non-skin surface side T2 rather than the non-skin surface 35n of the non-squeezed portion 35, compared to the case where this is not the case, You need to squeeze it hard.
  • the top sheet 10 is not compressed when forming the first compressed grooves 41, there is no possibility that the top sheet 10 will be torn. As a result, even if the top sheet 10 comes into contact with the excretion port E due to the inner absorbent core portion IAC protruding toward the skin side T1, there is no tearing of the top sheet 10 due to the formation of the first compressed groove 41. , it is possible to make it difficult for the wearer to feel uncomfortable. Further, when the user visually recognizes the top sheet 10, the user does not think that the absorbent article 1 is a defective product, and the deterioration in quality of the absorbent article 1 can be suppressed.
  • the top sheet 10 is compressed in addition to the absorbent core 31 and the core wrap sheet 32.
  • the absorbent core 31 is compressed together with the top sheet 10.
  • the tensile strength of the top sheet 10 in the width direction W may be 10 N/25 mm or less.
  • the softness of the top sheet 10 can be ensured.
  • the inner absorbent core portion IAC protrudes toward the skin side T1, so that even if the top sheet 10 comes into contact with the excretory opening E, the wearer is less likely to feel uncomfortable.
  • the tensile strength can be measured by the following method.
  • the top sheet 10 is removed from the absorbent article 1.
  • the top sheet 10 is cut out so that the length of the top sheet 10 in the front-rear direction L is 25 mm.
  • the cut out top sheet 10 is set in a tensile testing machine (Autograph AGS-1kNG, manufactured by Shimadzu Corporation), and the distance between the chucks is set to 100 mm. With one side of the cut out top sheet 10 in the width direction W fixed, the top sheet 10 is pulled to the other side in the width direction W.
  • the tensile speed is 100 mm/min. The maximum value of the tensile force when the top sheet 10 breaks is measured as the tensile strength.
  • the tensile strength of the top sheet 10 with a length of 25 mm is evaluated. Since the length of the top sheet 10 is based on 25 mm, the denominator of the unit is 25 mm.
  • the width of the second compression groove 42 may be wider than the width of the first compression groove 41. Further, the width of the second compressed groove 42 may be wider than the width of the third compressed groove 43. Thereby, the width of the absorbent core can be suppressed to the extent that the second compressed groove 42 is wide.
  • the width of the compressed groove 40 is the distance from one side wall of the compressed groove 40 to the other side wall in a direction perpendicular to the direction in which the compressed groove 40 extends in a plan view of the absorbent article 1.
  • the width of the first compression groove 41 may be wider than the width of the third compression groove 43. Thereby, compared to the third pressing groove 43, the absorbent cores 31 are less likely to come into contact with each other in the first pressing groove 41.
  • the deformation of the absorbent core 31 can be made difficult to be inhibited, and the inner absorbent core part IAC can be easily raised toward the skin side T1.
  • the width of the third compression groove 43 may be wider than the width of the first compression groove 41.
  • the first absorbent core portion 311 may have relatively high rigidity portions and relatively low rigidity portions alternately arranged in the front-rear direction L. Thereby, the absorbent core can be easily bent in the front-rear direction L using the low-rigidity portion as a base point, so that the absorbent article 1 can be easily aligned with the wearer's body in the front-rear direction L.
  • the third absorbent core section 313 may also have the same rigidity as the first absorbent core section 311.
  • positions other than the compressed grooves 40 may be compressed.
  • it may be compressed in dots inside the annular second compressed groove 42.
  • a plurality of dot-like compressed portions may be arranged on a line outside the second compressed groove 42 in the front-rear direction L.
  • the top sheet 10 is compressed in these compressed parts similarly to the second compressed groove 42.
  • FIG. 8 is a plan view of the absorbent body 30 according to the modified example, viewed from the skin side T1.
  • the first compression groove 41 and the third compression groove 43 are illustrated, and the second compression groove 42 is not illustrated.
  • the first compression grooves 41 extend intermittently in the front-rear direction L.
  • the rigidity between the first compressed grooves 41 in the front-back direction L (the first intermittent portions 41i to be described later) is reduced, so that the absorbent core 31 is moved in the front-back direction L between the first compressed grooves 41 in the front-back direction L. It becomes easier to bend.
  • the absorbent core 31 can easily bend along the wearer's body in the front-rear direction L, and the absorbent core 31 can easily fit the wearer's body.
  • the third compressed groove 43 also extends intermittently in the front-rear direction L, similarly to the first compressed groove 41. Therefore, like the first compressed groove 41, the absorbent core 31 can easily bend along the wearer's body in the front-rear direction L, and the absorbent core 31 can easily fit the wearer's body.
  • Each of the first compression groove 41 and the third compression groove 43 may extend intermittently in the front-rear direction L outside the central front region in the front-rear direction L.
  • the first compressed groove 41 is not arranged in a region that overlaps the central front region in the width direction W (or thickness direction T).
  • the third compressed groove 43 is arranged in a region that overlaps the central front region in the width direction W (or thickness direction T).
  • the 1st compression groove 41 may be arrange
  • the first compressed groove 41 may be arranged at a position overlapping the high basis weight region HWR in the thickness direction T.
  • the area other than the high basis weight area HWR is the low basis weight area LWR.
  • the absorbent article 1 (absorbent body 30) is arranged between a plurality of compressed groove portions (hereinafter referred to as first compressed groove portions 41p) constituting the first compressed groove 41 and a plurality of first compressed groove portions 41p. (hereinafter referred to as the first intermittent portion 41i).
  • first compressed groove portions 41p a plurality of compressed groove portions constituting the first compressed groove 41
  • first intermittent portion 41i a plurality of first compressed groove portions 41p.
  • the total length of the plurality of first compression groove portions 41p may be longer than the total length of the one or more first intermittent portions 41i.
  • the total length of the one or more first intermittent portions 41i does not need to include the length of the first intermittent portions 41i that is longer than the length in the front-rear direction L of one first compression groove portion 41p.
  • the length of the first intermittent portion 41i that overlaps the high basis weight region HWR in the thickness direction T may not be included in the total length of the one or more first intermittent portions 41i.
  • the absorbent article 1 (absorbent core 30) is arranged between a plurality of compressed groove portions (hereinafter referred to as third compressed groove portions 43p) constituting the third compressed groove 43 and a plurality of third compressed groove portions 43p. (hereinafter referred to as third intermittent portion 43i).
  • third compressed groove portions 43p a plurality of compressed groove portions constituting the third compressed groove 43 and a plurality of third compressed groove portions 43p.
  • third intermittent portion 43i hereinafter referred to as third intermittent portion 43i.
  • the total length of the plurality of third compressed groove portions 43p may be longer than the total length of the one or more third intermittent portions 43i.
  • the position of the first intermittent portion 41i may be shifted from the position of the third intermittent portion 43i. Therefore, the first intermittent portion 41i and the third intermittent portion 43i may not overlap in the width direction W, or only a portion of the first intermittent portion 41i may overlap with the third intermittent portion 43i in the width direction W. You can.
  • the first intermittent portion 41i is located further forward than the third intermittent portion 43i.
  • the rigidity of the first intermittent portion 41i is lower than the rigidity of the first compressed groove 41
  • the rigidity of the third intermittent portion 43i is lower than the rigidity of the third compressed groove 43. Therefore, at the rear of the central front region, absorption is carried out along a line passing through the first intermittent portion 41i and the third intermittent portion 43i (that is, the line L13 that goes outward in the width direction W as it goes toward the front side in the front-rear direction L).
  • the core 31 becomes easier to bend.
  • the absorbent core 31 becomes easier to bend along the buttocks, and leakage of excrement to the rear of the wearer can be further suppressed.
  • the first intermittent portion 41i may be located on the rear side of the third intermittent portion 43i.
  • the absorbent core 31 extends along a line passing through the first intermittent portion 41i and the third intermittent portion 43i (that is, a line that goes inward in the width direction as it goes toward the front side in the front-rear direction). becomes easier to bend.
  • the absorbent core 31 becomes easier to bend along the abdomen, and leakage of excrement to the front of the wearer can be further suppressed.
  • the length of the first intermittent portion 41i in the front-rear direction L may be longer than the length of the second intermittent portion 42i in the front-rear direction L. Thereby, the first compressed groove 41 receives a force directed inward in the width direction W more easily than the second compressed groove 42, and becomes easier to deform with the first compressed groove 41 as a base point. Further, the length of the third intermittent portion 43i in the front-rear direction L may be longer than the length of the second intermittent portion 42i in the front-rear direction L. Thereby, the force directed inward in the width direction W is more easily received in the third compressed groove 43 than in the second compressed groove 42, and it becomes easier to deform with the third compressed groove 43 as a base point.
  • the positional relationship in the front-rear direction L between the first intermittent portion 41i and the third intermittent portion 43i is such that the first intermittent portion 41i closest to the third intermittent portion 43i is Targeted.
  • the positional relationship in the front-rear direction L between the first intermittent portion 41i and the third intermittent portion 43i is such that the third intermittent portion 43i closest to the first intermittent portion 41i is is the target.
  • FIG. 9 is a schematic side view of a part of the manufacturing line for the absorbent article 1 according to the embodiment.
  • FIG. 10 is a schematic front view of the first compressing device 121 according to the embodiment.
  • FIG. 11 is a partially enlarged sectional view of the first compressing device 121 according to the embodiment.
  • FIG. 12 is a diagram for explaining the feeding speed of the base material 30B of the absorber.
  • the manufacturing apparatus 100 for the absorbent body 30 includes a compression device 120.
  • the manufacturing device 100 may further include a base material forming device 110 and a cutting device 130.
  • the base material forming device 110 forms a base material of an absorbent body.
  • the base material forming device 110 may form the base material 30B of the absorbent body 30 by covering the absorbent core material 31M and the absorbent core material 31M with a covering sheet in the vertical direction TD.
  • the manufacturing apparatus 100 does not include a base material forming device, and may perform a compression process on a preformed absorbent body base material (for example, an air-laid pulp sheet) using a compression device 120 or the like. .
  • the base material forming device 110 includes a rotating drum 111 and a supply section 112 that supplies the absorbent core material 31M onto the outer peripheral surface of the rotating drum 111.
  • the compression device 120 forms compression grooves 40 in the base material of the absorbent core 30.
  • the cutting device 130 cuts the base material 30B of the absorbent body 30 so as to divide the base material 30B in the transport direction MD.
  • the cutting device 130 includes a rotating drum having a cutter blade for cutting the base material 30B. A cutter blade is attached to the outer circumferential surface of the rotating drum.
  • the manufacturing apparatus 100 has a transport direction MD (Machine Direction), a cross direction CD (Cross Direction) perpendicular to the transport direction MD, and a vertical direction TD (Transverse Direction) perpendicular to the transport direction MD and the cross direction CD. and has.
  • MD Machine Direction
  • CD Cross direction
  • TD Transverse Direction
  • the compression device 120 includes a first compression device 121 and a second compression device 122.
  • the first compression device 121 forms a first compression groove 41 and a third compression groove 43.
  • the second compression device 122 forms a second compression groove 42 .
  • the first pressing device 121 has a pair of rolls including an upper roll 121U and a lower roll 121L. As shown in FIG. 10, the upper roll 121U and the lower roll 121L face each other.
  • the upper roll 121U rotates around a rotation axis CU parallel to the cross direction CD.
  • the lower roll 121L rotates around a rotation axis CL that is parallel to the cross direction CD.
  • the lower roll 121L has a placement surface PS on which the base material 30B of the absorbent body is placed.
  • the placement surface PS is at least a portion of the outer peripheral surface of the lower roll 121L.
  • the first squeezing device 121 has a squeezing forming portion PF configured with a convex portion C and a concave portion R facing each other.
  • the convex portion C has a top portion Ct and side portions Cs located on both sides of the top portion Ct in the intersecting direction CD.
  • the recessed portion R has a bottom portion Rb and side portions Rs located on both sides of the bottom portion Rb in the cross direction CD.
  • the compression forming portion PF includes a side compression forming portion PFs and a center compression forming portion PFc.
  • the side compression forming portion PFs is a portion of the side portion Cs of the convex portion C and the side portion Rs of the recessed portion R that compresses the base material 30B of the absorbent body.
  • the center compression forming portion PFc is a portion where the base material 30B of the absorbent body is compressed by the top Ct of the convex portion C and the bottom Rb of the recess R.
  • a plurality of compressed forming parts PF are arranged at intervals in the cross direction CD.
  • the plurality of compression formation parts PF include a first compression formation part PF1, a second compression formation part PF2, and a third compression formation part PF3.
  • the second compression formation part PF2 is arranged next to the first compression formation part PF1 on one side in the cross direction CD, and is arranged next to the third compression formation part PF3 on the other side in the cross direction CD.
  • the first compression forming part PF1 and the third compression forming part PF3 are provided at positions shifted in the cross direction CD from the centers of the upper roll 121U and the lower roll 121L in the cross direction CD.
  • the second compression forming portion PF2 is provided at the center of the upper roll 121U and the lower roll 121L in the cross direction CD.
  • the upper roll 121U is provided with a convex portion C1 of the first compressed forming portion PF1, a recessed portion R2 of the second compressed forming portion PF2, and a convex portion C3 of the third compressed forming portion PF3.
  • the lower roll 121L is provided with a recess R1 of the first pressing forming part PF1, a convex part C2 of the second pressing forming part PF2, and a recess R3 of the third pressing forming part PF3.
  • the convex portion C1 and the concave portion R1 are opposed to each other, the convex portion C2 and the concave portion R2 are opposed to each other, and the convex portion C3 and the concave portion R3 are opposed to each other.
  • the first compression device 121 is provided with a non-squeezing forming section NP that conveys the base material 30B of the absorbent body without squeezing it, on both sides of the squeezing forming section PF in the cross direction CD.
  • the non-pressed forming part NP is provided between the first pressed forming part PF1 and the second pressed forming part PF2, and between the second pressed forming part PF2 and the third pressed forming part PF3.
  • the non-squeezed forming portion NP is provided on the outer side in the cross direction CD than the first press forming portion PF1, and is provided on the outer side in the cross direction CD than the third press forming portion PF3.
  • the convex portion C1 of the first compression forming portion PF1 has a top portion C1t and side portions C1s located on both sides of the top portion C1t in the intersecting direction CD.
  • the recessed portion R1 of the first compression forming portion PF1 has a bottom portion R1b and side portions R1s located on both sides of the bottom portion R1b in the cross direction CD.
  • the first compression forming part PF1 has a first side compression forming part PF1s and a first center compression forming part PF1c.
  • the first side compression forming portion PF1s is a portion of the side portion C1s of the convex portion C1 and the side portion R1s of the recessed portion R1 that compresses the base material 30B.
  • the first side compression forming portion PF1s has an end PF1sa on one side and an end PF1sb on the other side in the vertical direction TD.
  • the end PF1sa is the end on the top C1t side
  • the end PF1sb is the end on the side away from the top C1t.
  • the end PF1sa is the end on the bottom R1b side
  • the end PF1sb is the end on the side away from the bottom R1b.
  • the first center compression forming part PF1c is a part that compresses the base material 30B with the top part Clt of the convex part C1 and the bottom part R1b of the recessed part R1.
  • each of both ends of the first center compressed forming portion PF1c in the intersecting direction CD is continuous with the end portion PF1sa of the first side compressed forming portion PF1s.
  • the 2nd compression formation part PF2 and the 3rd compression formation part PF3 are the same as the 1st compression formation part PF1.
  • the base material 30B is sent out in the transport direction MD while being compressed by at least the side compression forming part PFs.
  • the difference between the feeding speed of the base material on one side of the side compression forming part PFs and the feeding speed of the base material on the other side in the vertical direction TD is within 5%.
  • the base material 30B of the absorbent body is conveyed while being placed on one of a pair of rolls (hereinafter referred to as the lower roll 121L).
  • the lower roll 121L one end PF1sa of the first side compression forming part PF1s is closer to the rotation axis CL of the lower roll 121L than the other end PF1sb, so the base at the end PF1sa is The feeding speed V1a of the material 30B becomes relatively slow, and the feeding speed V1b of the base material 30B at the end portion PF1sb becomes relatively fast.
  • the distance from the end PF1sa to the rotation axis CL is r1a
  • the distance r1b from the end PF1sb to the rotation axis CL and the difference D1 between the end PF1sb and the end PF1sa.
  • the delivery speed V is expressed as the product of the distance (radius) from the rotation axis CL to a predetermined position of the roll and the angular velocity of the roll, and a relative speed difference ⁇ V1 occurs according to the difference D1.
  • the portion of the base material 30B fed out at the end PF1sa of the first side compressed forming section PF1s is conveyed relatively slowly, and the portion of the base material 30B fed out at the end PF1sb of the first side compressed forming section PF1s is conveyed relatively slowly. Transported quickly.
  • the relative speed difference ⁇ V1 causes a shift in the transport direction MD within the base material 30B. Since the compressed portion has high rigidity, damage (particularly breakage) is likely to occur due to deviation in the conveyance direction MD.
  • the difference ⁇ V in the feeding speed of the base material 30B between one side (for example, the end part PF1sa) and the other side (for example, the end part PF1sb) of the side compression forming part PFs is set to 5%. within. Specifically, the difference ⁇ V1 in the feeding speed of the base material 30B in the first side compression forming part PF1s is kept within 5%. Further, in the second side compression forming portion PF2s, the difference ⁇ V2 between the feed-out speed V2a of the base material 30B at the end portion PF2sa and the feed-out speed V2b of the base material 30B at the end portion PF2sb is set to within 5%.
  • the difference ⁇ V in the feeding speed of the base material 30B between one side and the other side of the side compression forming part PFs is within 1.5%.
  • the difference ⁇ V in the feeding speed of the base material 30B may be 1.01%.
  • the shortest distance Lc from the top Ct (for example, top C2t) of the convex portion C to the bottom Rb (for example, bottom R2b) of the convex portion R is the shortest distance Lc from the top Ct (for example, the top C2t) of the convex portion C to the side Cs (for example, It may be longer than the shortest distance Ls from the side portion C2s) to the side portion Rs of the recess R (for example, the side portion R2s).
  • the force that the base material 30B receives from the top portion Ct and the bottom portion Rb becomes relatively weaker than the force that the base material 30B receives from the side compression forming portions PFs. Thereby, the rigidity of the portion compressed by the top portion Ct and the bottom portion Rb can be lowered, and deterioration in the feel of the portion to the wearer can be reduced.
  • the maximum difference between the feeding speed of the base material 30B of the first compressed forming part PF1 and the feeding speed of the base material 30B of the second compressed forming part PF2 may be within 5%.
  • the difference between the end portion PF1sa of the first compressed forming portion PF1 and the end portion PF2sb of the second compressed forming portion PF2 may be within 5%. This reduces the deviation in the conveying direction between the portion of the base material 30B that is conveyed relatively quickly and the portion that is conveyed relatively slowly among the first compressed forming section and the second compressed forming section. can. As a result, damage to the base material 30B due to deviation in the transport direction MD within the base material 30B can be suppressed.
  • the maximum difference between the feeding speed of the base material 30B of the first pressing and forming part PF1 and the feeding speed of the base material 30B of the second pressing and forming part PF2 is determined. may be within 4%, preferably within 1.5%. For example, the maximum difference between these speeds may be 1.01%.
  • the maximum difference between the feeding speed of the base material 30B of the second pressing forming part PF2 and the feeding speed of the base material 30B of the third pressing forming part PF3 may be the same. It may be within 5%.
  • the difference between the maximum feeding speed and the minimum feeding speed of the base material 30B of the plurality of compression forming parts PF may be the same.
  • the non-squeezed forming part NP is a mounting surface PS parallel to the cross direction CD, on which the end of the base material 30B in the cross direction CD is placed. It has an end parallel surface EPS. Moreover, in the present embodiment, in the lower roll 121L, each mounting surface PS of the non-squeezed forming part NP located between the plurality of squished forming parts PF is parallel to the cross direction CD.
  • the maximum distance Md in the vertical direction TD is the radial distance from the rotation axis CL of the lower roll 121L to the end parallel surface EPS with the end parallel surface EPS of each side compression forming portion PFs of the plurality of compression forming portions PF as the reference BL. It may be 5% or less of r.
  • the maximum distance Md is preferably 2.5% or less of the radial distance r, and more preferably 1.1% or less of the radial distance r. The farther the side compressed forming part PFs is from the end parallel surface EPS in the vertical direction TD, the more the difference between the feeding speed of the base material 30B at the side compressing forming part PFs and the feeding speed of the base material 30B at the end parallel surface EPS increases.
  • the end farthest from the reference BL is the end part PF1sa, so that the first side compressed forming part
  • the maximum distance Md1 of PFs1 is the distance from the reference BL to the end PF1sa of the first side compression forming portion PF1s in the recess R1.
  • the maximum distance Md2 of the second side compressed forming portion PFs2 is the distance from the reference BL to the end portion PF2sa of the second side compressed forming portion PF2s in the recess R2. Therefore, the maximum distances Md1 and Md2 may be 5% or less of the radial distance r.
  • the interval between the plurality of compressed forming portions PF in the cross direction CD may be equal to or greater than the height of the convex portion C in the vertical direction TD.
  • the force applied between the plurality of compression forming parts PF is not concentrated on a local part of the base material 30B but is dispersed over a wide range in the cross direction CD.
  • the deviation in the transport direction MD per unit length in the cross direction CD can be reduced. It is possible to reduce the concentration of load on a local portion of the base material 30B located between the plurality of compression forming parts PF, and it is possible to suppress damage to the base material 30B that occurs between the plurality of compression formation parts PF.
  • the interval between the plurality of compressed forming parts PF is preferably twice or more, and five times or more, the height of the convex part C. More preferably.
  • a central region located at the center when the mounting surface PS is divided into five equal parts in the cross direction CD, and side regions SR located on both sides of the central region CR in the cross direction CD are provided. It's fine. Any one of the plurality of compression forming parts PF may be located in the central region CR. Thereby, any one of the plurality of compression forming parts PF may compress the base material 30B in the central region CR. In the compression process described below, the compression forming part PF that compresses the base material 30B in the central region CR can press the center of the base material 30B in the cross direction CD, and can suppress displacement of the center of the base material 30B.
  • the second compression formation part PF2 is located in the central region CR, and the first compression formation part PF1 and the third compression formation part PF3 are located in the side region SR.
  • none of the plurality of compression forming parts PF need to compress the base material 30B in the central region CR.
  • the plurality of compression forming parts PF may compress the base material 30B in the side regions SR of the central region CR without compressing the base material 30B in the central region CR. Since the end of the base material located in the side region SR that is far from the center region CR is a free end, the force due to compression is easily released at the end. On the other hand, since the ends on both sides of the base material portion located in the central region CR are connected to the base material portions located in the side regions, it is difficult for the force due to compression to escape.
  • Damage to the base material 30B can be suppressed by the plurality of compression forming parts PF compressing the base material 30B in the side regions SR without compressing the central region CR.
  • the plurality of compression forming parts PF may not compress the base material 30B only in one side region SR, but may compress the base material 30B in both side regions SR. Since the plurality of compressed forming parts PF press the base material 30B from both sides in the cross direction CD, it becomes difficult for force to concentrate on one side in the cross direction CD. Thereby, it is easy to balance the base material 30B during transportation, and it is possible to suppress positional deviation during transportation. As a result, it is possible to prevent the base material 30B from being squeezed at a position different from the intended position due to the positional shift of the base material 30B.
  • the upper roll 121U which is one roll, may have a convex portion C1 of the first compressed forming portion PF1 and a recessed portion R2 of the second compressed forming portion PF2.
  • the lower roll 121L which is the other roll, may have a concave portion R1 of the first compressed forming portion PF1 and a convex portion C2 of the second compressed forming portion PF2.
  • the base material 30B is compressed from one side in the vertical direction TD by the convex part C1 of the first compressed forming part PF1
  • the base material 30B is compressed from the other side in the vertical direction TD by the convex part C2 of the second compressed forming part PF2. Squeeze 30B.
  • the rotation speed of the upper roll 121U and the lower roll 121L when the rotation speed of the upper roll 121U and the lower roll 121L is the set maximum value, the rotation speed of the base material 30B on one side of the side compression forming part PFs in the vertical direction TD is The difference between the feeding speed and the feeding speed of the base material on the other side may be 5% or more.
  • the manufacturer may control the rotation speeds of the upper roll 121U and the lower roll 121L so that the difference in the delivery speed is within 5% depending on the type of absorbent body 30 being manufactured.
  • the second pressing device 122 has a pair of rolls configured by an upper roll 122U and a lower roll 122L that face each other.
  • the upper roll 122U rotates around a rotation axis CU parallel to the cross direction CD.
  • the lower roll 121L rotates around a rotation axis CL that is parallel to the cross direction CD.
  • the second squeezing device 122 squeezes the base material 30B with a convex portion (not shown) facing parallel surfaces.
  • the upper roll 122U is provided with a convex portion
  • the lower roll 121L is provided with a parallel surface.
  • the method for manufacturing the absorbent core 30 includes a first pressing step S20.
  • the manufacturing method may further include a base material forming step S10, a cutting step S30, a top sheet arrangement step S40, and a second pressing step S50.
  • the first squeezing process S20 and the second squeezing process S50 are included in the squeezing process.
  • the manufacturing method may not include the base material forming step.
  • the base material 30B of the absorber 30 is formed. More specifically, in the base material forming step S10, the base material 30B of the absorbent body 30 may be formed by laminating the absorbent core material 31M, which is an absorbent material that absorbs body fluids, or the absorbent material may be formed into a sheet shape. The base material 30B of the absorbent body 30 may be formed by covering one vertical side of the absorbent core material 31M with a covering sheet. The base material 30B of the absorber 30 may be formed by covering both sides of the core material in the vertical direction with a covering sheet.
  • the absorbent core material 31M which is an absorbent material that absorbs body fluids
  • the base material 30B of the absorbent body 30 may be formed by covering one vertical side of the absorbent core material 31M with a covering sheet.
  • the base material 30B of the absorber 30 may be formed by covering both sides of the core material in the vertical direction with a covering sheet.
  • the base material of the covering sheet (for example, the base material 32B of the core wrap sheet 32) may be covered in the vertical direction TD.
  • the base material 32B1 of the core wrap sheet 32 disposed on the non-skin side T2 is conveyed by a conveyance unit such as a belt conveyor.
  • the absorbent core material 31M is placed from the rotating drum 111 on the base material 32B1 being transported.
  • the base material 32B2 of the core wrap sheet 32 disposed on the skin side T1 is placed on the absorbent core material 31M.
  • both sides of the absorbent core material 31M in the vertical direction are covered in the vertical direction TD by the base material 32B of the core wrap sheet 32 corresponding to the covering sheet.
  • the base material 30B of the absorber 30 is formed.
  • pressing grooves 40 are formed in the base material 30B by the convex portion C provided on one roll of the pair of rolls and the recessed portion R provided on the other roll.
  • the base material 30B is compressed by the convex part C1 and the recessed part R1 in the first compressed forming part PF1.
  • the base material 30B is compressed by the side compression forming portions PFs and the center compression forming portion PFc.
  • first compressed grooves 41 are formed in the base material 30B.
  • the base material 30B is compressed by the convex portion C3 and the recessed portion R3.
  • first compressed grooves 41 are formed in the base material 30B.
  • the 2nd compression groove 42 is not formed in the 1st compression process.
  • the base material 30B is sent out in the conveyance direction MD while being squeezed by at least the side compression forming part PFs. Moreover, in this embodiment, the base material 30B is sent out in the conveyance direction MD while being compressed not only by the side compression forming part PFs but also by the center compression forming part PFc. The difference between the feeding speed of the base material 30B on one side of the side compression forming part PFs and the feeding speed of the base material 30B on the other side is within 5%.
  • the base material 30B is cut so as to divide the base material 30B in the transport direction MD.
  • the cutter blade cuts the base material 30B as the rotating drum rotates.
  • the base material 30B is cut after the first pressing step S20.
  • the base material 30B before being divided is more difficult to move when forming the compressed grooves 40 than the cut base material 30B. Therefore, the compressed grooves 40 can be easily formed at targeted positions, and the quality of the absorbent body 30 can be stabilized.
  • the base material 10B of the top sheet 10 is placed on the base material 30B of the absorber 30.
  • the base material 30B (base material 32B1) of the absorber 30 is covered by the base material 10B of the top sheet 10 in the vertical direction TD. Therefore, the base material 10B of the top sheet 10 is arranged above the base material 30B.
  • the base material 10B of the top sheet 10 in addition to the base material 30B is compressed by the convex portion C provided on one roll of the pair of rolls and the recessed portion R provided on the other roll.
  • a compressed groove 40 is formed.
  • the base material 30B and the base material 10B are compressed by rotating the upper roll 122U and the lower roll 122L.
  • the second compressed groove 42 is formed by pressing a convex portion (not shown) provided on the upper roll 122U against the flat outer peripheral surface of the lower roll 122L.
  • the difference between the feeding speed of the base material 30B at the top of the convex portion provided on the upper roll 122U and the feeding speed of the base material 30B at the side of the convex portion may be 5% or more.
  • the absorbent article 1 is manufactured.
  • other constituent members for example, the reinforcing sheet 15, the base material of the back sheet 20, etc.
  • the absorbent article 1 is manufactured.
  • steps may be performed between the above steps.
  • the step of forming dotted compressed portions on the base material 32B1 may be performed between the base material forming step S10 and the first compressing step S20, or between the first compressing step S20 and the cutting step S30. It may be executed in between.
  • the step of compressing the base material 10B of the top sheet 10 and the base material 30B of the absorbent core 30 may be arranged between the top sheet arrangement step S40 and the second compressing step S50, or the step of compressing the base material 10B of the top sheet 10 and the base material 30B of the absorber 30 may be arranged between the top sheet arrangement step S40 and the second compressing step S50, or the second compressing step It may be executed after S50.
  • the first pressing step S20 may be performed after the cutting step S30. Therefore, the first compressed groove 41 or the third compressed groove 43 may be formed in the cut base material 30B.
  • the cutting step S30 force is applied to the base material when cutting the base material 30B, causing the base material to expand and contract. Due to the expansion and contraction of the base material 30B, the degree of compression formed on the base material 30B tends to be weakened.
  • by forming compression grooves in the cut base material 30B it is possible to prevent the degree of compression from becoming weaker in the cutting step S30. The intended compression can be achieved and the quality of the absorbent body 30 can be stabilized.
  • FIG. 13 is a partially enlarged cross-sectional view of the first compressing device 121 according to the first modification.
  • FIG. 13 is a cross-sectional view similar to FIG. 11.
  • FIG. 14 is a partially enlarged sectional view of the first compression device 121 according to Modifications 2 and 3.
  • FIG. 14(A) is a partially enlarged sectional view of the first compressing device 121 according to Modification Example 2.
  • FIG. FIG. 13 is a partially enlarged cross-sectional view of the first compressing device 121 according to the first modification.
  • FIG. 14 is a cross-sectional view similar to FIG. 11.
  • FIG. 14 is a partially enlarged sectional view of the first compression device 121 according to Modifications 2 and 3.
  • FIG. 14(A) is a partially enlarged sectional view of the first compressing device 121 according to Modification Example 2.
  • FIG. 14(B) is a partially enlarged sectional view of the first compressing device 121 according to the third modification.
  • FIG. 15 is a diagram for explaining a convex portion C according to modification example 4.
  • FIG. 15(A) is a diagram for explaining the convex portion C.
  • FIG. 15(B) is a schematic cross-sectional view taken along line F15B-F15B shown in FIG. 15(A).
  • FIG. 16 is a schematic front view of the first compression device 121 according to Modification Example 5.
  • the compression forming part PF may not have the center compression formation part PFc, but may have only the side compression formation parts PFs. Therefore, the shortest distance Lc from the top Ct of the convex portion C to the bottom Rb of the recess R may be longer than the thickness of the base material 30B of the absorber 30 (that is, the length in the vertical direction TD). As a result, the center side of the compression groove 40 in the width direction W is not compressed, so that the force compressed by the side compression forming portion PFs can easily escape, and damage to the base material 30B can be suppressed.
  • the non-pressed forming part NP is arranged between the first pressing forming part PF1 and the second pressing forming part PF2. It may have an intermediate surface IS facing the material 30B.
  • the intermediate surface IS is a part of the outer peripheral surface of the lower roll 121L.
  • the intermediate surface IS may have a parallel extending surface EXS and an axis-side parallel surface AS.
  • the intermediate surface IS is, for example, a surface from the end of the recess R1 of the first compression forming part PF1 (the opening edge of the recess R1) to the end of the convex part C2 of the second compression forming part PF2 (the base of the convex part C2).
  • the surface connecting the parallel extending surface EXS and the shaft-side parallel surface AS is a surface extending parallel to the cross direction CD, and the surface connecting the parallel extending surface EXS and the shaft-side parallel surface AS It may be perpendicular to.
  • the parallel extending surface EXS is a surface extending in parallel to the cross direction CD from the end of the compressed forming part PF in the cross direction CD.
  • the end of the compression formation part PF in the cross direction CD may be the opening edge of the recess (for example, the end part PF1sb of the first side compression formation part PF1s).
  • the compression forming portion PF is a convex portion C, it may be the base of the convex portion C.
  • the parallel extending surface EXS extends from one end of the first pressed forming part PF1 of the lower roll 121L (in FIG.
  • the end PF1sb of the first side pressed forming part PF1s) to the second pressed forming part PF2. may extend parallel to.
  • the length Le of the parallel extending surface EXS in the cross direction CD may be longer than the depth of the recess R (that is, the height in the vertical direction TD from the parallel extending surface EXS to the bottom Rb), and preferably the recess R
  • the depth may be twice or more than the depth of .
  • the shaft-side parallel surface AS is a surface that is closer to the rotation axis CL of the lower roll 121L than the parallel extending surface EXS and extends narrowly in the cross direction CD.
  • the shaft side parallel surface AS is a surface extending parallel to the cross direction CD from the end of the second compressed forming part PF2 in the cross direction CD in the lower roll 121L, It may coincide with the parallel extending surface EXS extending from the two-pressed forming part PF2.
  • the average distance in the vertical direction TD from the shaft-side parallel surface AS to the upper roll 121U may be longer than the average distance in the vertical direction TD from the parallel extension surface EXS to the upper roll 121U. Therefore, in FIG. 14(A), the average value of the distance Di in the vertical direction TD from the shaft-side parallel surface AS to the upper roll 121U is the average value of the distance De in the vertical direction TD from the parallel extending surface EXS to the upper roll 121U. It's good that it's big. Therefore, in the non-squeezed forming portion NP, a space may be provided in which the base material 30B can move freely to some extent in the vertical direction TD.
  • the distance between the upper roll 121U and the lower roll 121L is greater than on the parallel extension surface EXS, and the base material 30B can easily move in the vertical direction TD on the intermediate surface IS. Therefore, the force generated due to the deviation in the conveying direction MD between the relatively fast conveyed portion and the relatively slow conveyed portion of the first compressed forming portion PF1 and the second compressed forming portion PF2 is reduced. It becomes easier to escape. As a result, damage to the base material 30B due to deviation in the conveyance direction within the base material 30B can be suppressed.
  • the height in the vertical direction TD of the bottom portion Rb provided on the lower roll 121L is set from the rotation axis CL of the lower roll 121L to the end portion using the end parallel surface EPS as the reference BL. It may be 5% or less of the radial distance r to the parallel plane EPS.
  • the height of the bottom Rb with the end parallel plane EPS as the reference BL is preferably 2.5% or less of the radial distance r, and more preferably 1.1% or less of the radial distance r.
  • the heights of the bottom portion R1b and the bottom portion R3b match the parallel extending surface EXS and are 0% of the radial distance r.
  • the height of the top Ct provided on the lower roll 121L in the vertical direction TD may be 5% or less of the radial distance r, using the end parallel surface EPS as the reference BL.
  • the height of the top Ct with the end parallel plane EPS as the reference BL is preferably 2.5% or less of the radial distance r, and more preferably 1.1% or less of the radial distance r.
  • the height of the top Ct matches the parallel extending surface EXS and is 0% of the radial distance r.
  • the bottom portion Rb and the top portion Ct provided on the lower roll 121L may be located within 5% of the radial distance r using the end parallel surface EPS as the reference BL.
  • the base material 30B is not largely displaced in the vertical direction TD from one side of the base material 30B to the other side in the cross direction CD, and the base material 30B is Damage can be suppressed.
  • the concave portion R may be further away from the rotation axis CL in the vertical direction TD than the convex portion C in the lower roll 121L. Therefore, the concave portion R may be arranged at a higher position than the convex portion in the vertical direction TD. In such a case, parallel extending surfaces EXS may extend from both ends of the recess R in the cross direction CD.
  • the intermediate surface IS may have an inclined placement surface INS that is inclined with respect to the cross direction CD.
  • the length of the intermediate surface IS can be increased by the height due to the inclination.
  • the length in the cross direction CD between the first compression forming part PF1 and the second compression forming part PF2 is the same in the embodiment of FIG. 11 and the modified example of FIG. 14(B).
  • the length of the intermediate plane (parallel extending surface EXS) always parallel to the cross direction CD arranged between the first compression forming part PF1 and the second compression forming part PF2 is the length of the first pressing forming part PF1. and the second compression forming part PF2 in the cross direction CD.
  • the length of the intermediate surface IS is the length (Le) of the parallel extending surface EXS on the first compression forming part PF1 side in the intersecting direction CD, and the length of the inclined placement surface INS. This is the total length of the parallel extending surface EXS on the second compression forming portion PF2 side in the intersecting direction CD.
  • the length of the inclined placement surface INS in the cross direction CD is a
  • the length of the inclined placement surface INS in the vertical direction TD is b
  • the length of the inclined placement surface INS is (a 2 +b 2 ) 1/2 , which is greater than the length a of the inclined mounting surface INS in the cross direction CD. Therefore, the length of the intermediate surface IS in FIG. 14(B) is longer than the length of the intermediate surface (parallel extending surface EXS) in FIG. 11 by the height due to the inclination.
  • the force applied between the first compression forming part PF1 and the second compression forming part PF2 is dispersed over a wide range in the cross direction without being concentrated on a local part of the base material 30B.
  • the deviation in the transport direction MD per unit length in the cross direction CD between the first compression forming part PF1 and the second compression forming part PF2 can be reduced.
  • the angle of the inclined mounting surface INS with respect to the cross direction CD is preferably from 10 degrees to 30 degrees.
  • a plurality of small protrusions SC that protrude in the vertical direction TD may be arranged at intervals in the transport direction MD on the top Ct of the convex part C.
  • the small protrusion SC may extend in the cross direction CD while being inclined with respect to the conveyance direction MD.
  • the small protrusion SC may overlap the small protrusion SC adjacent to the small protrusion SC in the cross direction CD.
  • the small protrusion SC may include a first small protrusion SC1 and a second small protrusion SC2.
  • the second small projection SC2 is adjacent to the transport direction MD.
  • the rear end edge SC1b of the first small protrusion SC1 may be located more rearward than the front end edge SC1a of the second small protrusion SC2.
  • the adjacent small protrusion SC starts squeezing the base material 30B. Therefore, while the compression groove 40 is being formed, the small protrusion SC
  • the difference between the force applied thereto and the force applied between the small projections SC can be reduced. Damage to the base material 30B due to the difference in force can be suppressed.
  • the inclination angle ⁇ of the small protrusion SC with respect to the conveyance direction MD may be from 30 degrees to 60 degrees.
  • the rear side surface SCr of the small protrusion SC in the conveyance direction MD may be inclined with respect to the cross direction CD.
  • the inclination angle ⁇ between the rear side surface SCr and the top Ct of the convex portion C may be 90 degrees or more. Therefore, the rear side surface SCr of the small protrusion SC may be inclined so that the closer it is to the rotation axis CL from the top of the small protrusion SC in the cross direction CD, the further back the rear side SCr is located. This makes it easier for the small protrusions SC that have squeezed the base material 30B to come off from the base material 30B, thereby further suppressing minute damage to the base material 30B.
  • the front side surface of the small protrusion SC in the conveyance direction MD may similarly be inclined with respect to the cross direction CD.
  • the angle of inclination between the front side surface and the top Ct of the convex portion C may be 90 degrees or more.
  • each of the pair of rolls may have a plurality of roll parts divided in the cross direction CD.
  • the upper roll 121U may include a first upper roll part 121U1, a second upper roll part 121U2, and a third upper roll part 121U3.
  • the lower roll 121L may include a first lower roll part 121L1, a second lower roll part 121L2, and a third lower roll part 121L3.
  • At least one compressed forming part PF may be arranged in each of the plurality of roll parts.
  • Each roll part may be controlled to rotate at different rotational speeds. Thereby, in the pressing process, the rotational speed of each of the plurality of roll parts may be controlled so that the difference in the feeding speed of the base material 30B between the plurality of pressing forming parts PF is within 5%.
  • the rotation speed of the first lower roll part 121L1 having the recess R1 and the third lower roll part 121L3 having the recess R3 is set to a predetermined speed. It can be faster than the speed.
  • Each upper roll section may have the same rotational speed as the opposing lower roll section.
  • the base material 30B is fed relatively quickly at the convex portion C2, and the base material 30B is fed relatively slowly at the convex portion C1 facing the concave portion R1 and the convex portion C3 facing the concave portion R3. Therefore, the height of the convex portion C is limited so that the difference in feeding speed of the base material 30B becomes small.
  • the height of the convex part C is not limited, and the difference in the feeding speed of the base material 30B can be kept within 1%, and the deviation in the transport direction MD can be reduced. Damage to the base material 30B caused by this can be suppressed.
  • the vertical direction TD is The base material is no longer pressed down from both sides, and the force applied to the base material 30B between these compressed forming parts PF becomes easy to escape. Thereby, damage to the base material 30B between these compressed forming parts PF can be suppressed.
  • the quality of the absorbent core can be stabilized when compressed grooves are formed by compressing the base material of the absorbent core between the side portions of the convex portions and the side portions of the concave portions.

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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

L'invention concerne un procédé et un appareil de fabrication du corps absorbant, et un procédé de fabrication d'un article absorbant, permettant de stabiliser la qualité du corps absorbant lors de la formation d'une rainure de compression en pressant le matériau de base du corps absorbant entre le côté d'une saillie et le côté d'une cavité. Ce procédé de fabrication de corps absorbant (30) comporte une étape de pressage (S20, S50) pour former la rainure de compression dans le matériau de base au moyen de la saillie sur l'un d'une paire de rouleaux se faisant face et de la cavité sur l'autre rouleau. La partie de formation de compression comporte une partie de formation de compression latérale, qui est la partie qui presse le matériau de base entre le côté de la saillie et le côté de la cavité. Lors de l'étape de pressage, le matériau de base est acheminé dans la direction de transport tout en étant pressé par au moins la partie de formation de compression latérale. La différence entre la vitesse d'alimentation du matériau de base d'un côté de la partie de formation de compression latérale dans la direction verticale et la vitesse d'alimentation du matériau de base de l'autre côté est de l'ordre de 5 %.
PCT/JP2023/022711 2022-06-20 2023-06-20 Procédé et appareil de fabrication d'un corps absorbant, et procédé de fabrication d'un article absorbant WO2023249001A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-099252 2022-06-20
JP2022099252 2022-06-20

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WO2023249001A1 true WO2023249001A1 (fr) 2023-12-28

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WO (1) WO2023249001A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006020977A (ja) * 2004-07-09 2006-01-26 Kao Corp エンボス溝の成形性評価方法
WO2008062873A1 (fr) * 2006-11-22 2008-05-29 Uni-Charm Corporation Article absorbant et procédé de production associé
JP2014517878A (ja) * 2011-04-26 2014-07-24 ザ プロクター アンド ギャンブル カンパニー ウェブを変形させるための装置
WO2018083774A1 (fr) * 2016-11-04 2018-05-11 ユニ・チャーム株式会社 Procédé de fabrication d'un absorbant pour article absorbant, et dispositif associé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006020977A (ja) * 2004-07-09 2006-01-26 Kao Corp エンボス溝の成形性評価方法
WO2008062873A1 (fr) * 2006-11-22 2008-05-29 Uni-Charm Corporation Article absorbant et procédé de production associé
JP2014517878A (ja) * 2011-04-26 2014-07-24 ザ プロクター アンド ギャンブル カンパニー ウェブを変形させるための装置
WO2018083774A1 (fr) * 2016-11-04 2018-05-11 ユニ・チャーム株式会社 Procédé de fabrication d'un absorbant pour article absorbant, et dispositif associé

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