JP2017086619A - Absorbent product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent product in which a center and side regions of an absorbent core can also effectively provide an absorbent property, and having an excellent liquid return preventive property to skin and an excellent absorbent property for highly viscous excretion liquid.SOLUTION: An absorbent product 1 includes an absorbent body 14 having a skin-side sheet 10, a non-skin-side sheet 13, and an absorbent core 40. The skin-side sheet 10 is made up of a surface sheet 11A having a plurality of tall convex parts 31 and short convex parts 32, in which the short convex parts 32 has higher density than that of the tall convex parts 31, and a liquid passage R surrounding the tall convex parts 31 to communicate with the short convex parts 32. The absorbent core 40 includes a pair of side regions 45 and a center region 41 in an excretion facing part B, the center region 41 being thicker than each of the side regions 45 and integrally formed with the side regions 45. In each of the side regions 45, a plurality of compressed part 6 are formed in a scattered manner in a longitudinal direction and width direction of the product, the compressed part 6 serving as a local highly-dense part in which the part where the compressed part 6 is formed is made highly dense than peripheral parts.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

Conventionally, in absorbent articles intended to absorb liquid discharged from the body, the surface sheet is used for the purpose of preventing liquid return to the skin where the discharged liquid reattaches to the wearer's skin and improving the touch. It is widely practiced to form irregularities on the skin facing surface facing the skin side of the skin, and the skin facing surface has a relatively high height convex portion and a height lower than the high convex portion. Those having small convex portions whose density is higher than that of the high convex portions have been proposed (see Patent Documents 1 and 2).
In addition, a local thick part is provided in a part of the absorbent body facing the liquid discharge part of the wearer to improve the absorption performance of a necessary part, and an increase in the thickness as a whole is suppressed, and a sense of discomfort is worn. There is also known a technique for suppressing, and a technique for providing a compression portion continuously extending along the thick part on both sides of the thick part (see Patent Document 3).

JP 2011-015707 A JP 2011-080178 A JP 2011-120696A

  By the way, menstrual blood, which is a liquid absorbed by a sanitary napkin, may have a low viscosity or a relatively high viscosity depending on the period during menstruation, individual differences, and physical condition at that time. From the standpoint of preventing inconveniences such as stickiness and itching due to skin wetness, in all cases, the liquid excreted on the absorbent article is absorbed by the absorbent body so that it is isolated from the skin as quickly as possible. Although it is desired that the conventional absorbent articles have a high absorption performance for a liquid having a low viscosity, many of the conventional absorbent articles do not exhibit a sufficient absorption performance for a liquid having a high viscosity.

  The present invention relates to an absorbent article exhibiting excellent absorption performance even with excretory fluid having a relatively high viscosity.

  The present invention includes a skin-side sheet that forms a skin-facing surface, a non-skin-side sheet that forms a non-skin-facing surface, and an absorbent body including an absorbent core, and includes a front portion, an excretory portion-facing portion, and a rear portion in the longitudinal direction. The skin-side sheet has a high convex portion as a convex portion protruding toward the wearer's skin side and a height lower than the high convex portion. Each of the low convex portions has a higher density than the high convex portions, and the high convex portions and the low convex portions are disposed around the high convex portions. The absorbent core has a shape that is long in the longitudinal direction of the absorbent article, and a pair of the absorbent core that is located on both sides of the absorbent core. Between the pair of side regions and a central region having a higher basis weight than each of the side regions. The central region is thicker than the side regions, and is integrally formed with the side regions, and is locally formed on the skin facing surface side or the non-skin facing surface side of the side regions. A plurality of high density portions are formed in a state of being dispersed in the longitudinal direction and the width direction of the absorbent core, and in the lateral region, the density of the portion where the local high density portion is formed is higher than its surroundings. The absorbent article is provided.

  The absorptive article of the present invention is excellent in prevention of liquid return to the skin, and exhibits excellent absorption performance even with excretory liquid having a relatively high viscosity.

FIG. 1 is a partially broken perspective view of a sanitary napkin according to an embodiment of the present invention. 2 is a cross-sectional view taken along line IIa-IIa in FIG. FIG. 3 is a plan view of the sanitary napkin absorbent body shown in FIG. 1 as viewed from the skin facing surface side. FIG. 4A and FIG. 4B are enlarged plan views illustrating examples of preferable arrangement of the compression units, respectively. FIG. 5 is a schematic view showing a main part of a fiber stacking apparatus preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. 6 (a) and 6 (b) are explanatory diagrams of a method for manufacturing the absorbent body of the sanitary napkin shown in FIG. FIG. 7 is a perspective view showing a preferred example of the topsheet used in the absorbent article of the present invention. FIG. 8 is a plan view showing the shape and arrangement pattern of the embossed portions in the topsheet shown in FIG. FIG. 9 is an enlarged plan view showing a part of the top sheet shown in FIG. FIG. 10 is an enlarged plan view showing the shape and arrangement pattern of the embossed portion in the high convex portion shown in FIG. FIG. 11 is an enlarged plan view showing the shape and arrangement pattern of the embossed portion in the low convex portion shown in FIG. 12 is an enlarged sectional view taken along line VII-VII in FIG. 13 is an enlarged sectional view taken along line VIII-VIII in FIG. 14 is an enlarged sectional view taken along line IX-IX in FIG. 15 is an enlarged cross-sectional view of the E-F-G-H combination of FIG. FIG. 16: is a top view which shows the shape and arrangement | positioning pattern of an embossing part in another example of the surface sheet used for the absorbent article of this invention. FIG. 17: is a top view which shows the shape and arrangement | positioning pattern of the embossing part in another example of the surface sheet used for the absorbent article of this invention.

The present invention will be described below based on preferred embodiments with reference to the drawings.
As shown in FIG. 1, a sanitary napkin 1 (hereinafter also simply referred to as a napkin 1) that is an embodiment of the absorbent article of the present invention includes a skin-side sheet 10 that forms a skin-facing surface, and a non-skin-facing surface. The non-skin side sheet | seat 13 which forms and the absorber 14 containing the absorptive core 40 are provided. The absorber 14 is arrange | positioned between the skin side sheet | seat 10 and the non-skin side sheet | seat 13, as shown in FIG.
In an absorbent article such as a sanitary napkin, the skin facing surface P is a surface directed toward the wearer's skin when worn, and the above-described skin side sheet 10 forms the skin facing surface. Further, in an absorbent article such as a sanitary napkin, the non-skin facing surface Q is a surface that is directed to the side opposite to the wearer's skin side, usually the clothing side when worn, and the non-skin side sheet 13 described above is The non-skin facing surface is formed.
Further, the napkin 1 has a front part A, an excretory part facing part B, and a rear part C in the longitudinal direction X thereof. In an absorbent article such as a sanitary napkin, the longitudinal direction X is a direction that coincides with the wearer's front-rear direction when worn, and the width direction Y is orthogonal to the longitudinal direction X in plan view of the absorbent article. Direction. Moreover, the excretion part opposing part B is a site | part by which a wearer's liquid excretion part (vagina opening etc.) is opposingly arranged by the width direction center part at the time of wear, and the front part A is from the excretion part opposing part B at the time of wear. The rear part C is a part arranged on the back side of the excretory part facing part B when worn.

The napkin 1 has an absorbent main body 15 having a configuration in which a skin-side sheet 10, an absorbent core 40, and a non-skin-side sheet 13 are laminated in the thickness direction at the center in the width direction Y, and an excretory part facing part. A pair of wing portions 17, 17 are formed on the left and right sides of the absorbent main body 15 in B, and a pair of rear flap portions 18, 18 are formed on the left and right sides of the absorbent main body 15 in the rear portion C.
As shown in FIG. 1, the skin-side sheet 10 in the present embodiment includes a liquid-permeable surface sheet 11 and a pair of side sheets 12 and 12 bonded to both sides thereof. The liquid-permeable topsheet 11 is arranged extending in the longitudinal direction X at the center in the width direction Y of the napkin 1. The side sheets 12 are arranged on both side portions in the longitudinal direction X of the napkin 1, and as shown in FIG. 2, the inner edge portions 12a are overlapped on the top sheet 11, respectively. It is joined to the surface sheet 11 at a position slightly outside in the width direction Y. The pair of wing portions 17, 17 and the pair of rear flap portions 18, 18 include a side sheet 12 and a non-skin side sheet 13 that extend from both side edges of the absorbent main body 15. The surface of the wing portion 17 on the non-skin side sheet 13 side is provided with a wing portion adhesive portion (not shown) for fixing to the non-skin facing surface of the crotch portion of the shorts. A main body adhesive portion (not shown) for fixing the absorbent main body 15 to the inner surface of the shorts is provided on the surface. It is preferable that an adhesive portion is also provided on the surface of the rear flap portion 18 on the non-skin side sheet 13 side so as to be fixed to the inner surface of the shorts.

  The skin-side sheet 10 and the non-skin-side sheet 13 are bonded to each other with an adhesive at portions extending outward from the peripheral edge of the absorbent body 14 and heat-sealed by heat sealing or the like at the peripheral edge of the napkin 1. It is joined by.

As shown in FIGS. 1 and 3, the absorbent body 14 in the present embodiment has a vertically long shape that is long in the same direction as the longitudinal direction X of the napkin 1, and the absorbent body 14 is disposed inside the napkin. 1 has a vertically long absorbent core 40 that is long in the same direction as the longitudinal direction X.
The absorptive core 40 consists of the fiber aggregate which consists of fiber materials, such as a pulp fiber, or what hold | maintained the high water absorption polymer between the fibers of this fiber aggregate. Moreover, the absorber 14 is provided with the core wrap sheet | seat 14c which wraps the absorptive core 40, as shown in FIG. Specifically, the absorbent core 40 is covered with a core wrap sheet 14c made of tissue paper or a water-permeable nonwoven fabric on both side edges in the longitudinal direction X and the entire upper and lower surfaces. The core wrap sheet 14 c is used for the purpose of preventing leakage of the forming material of the absorbent core 40 and improving the shape retention of the absorbent core 40. The absorbent core 40 is preferably covered with the entire circumference of a transverse section along the width direction of the absorbent core 40 by one or a plurality of core wrap sheets. For example, both sides of one core wrap sheet arranged on the skin facing surface or non-skin facing surface side of the absorbent core 40 are folded back to the other surface side of the absorbent core 40, and the folded portions are It is also preferable to be laminated on both side portions of another core wrap sheet covering the other surface. The sheets of the stacked portions may not be joined, but are preferably bonded.

Between the surface sheet 11 and the absorbent body 14 of the skin side sheet 10, between the absorbent core 40 and the core wrap sheet covering the skin facing surface side, and covering the absorbent core 40 and the non-skin facing surface side. It is preferable that the core wrap sheet is bonded to each other by an adhesive that is pattern-coated with an intermittent pattern such as a dot pattern, a spiral pattern, a stripe pattern, or a checkered pattern.
In addition, in the napkin 1 of this embodiment, the longitudinal direction and the width direction of the absorber 14, and the longitudinal direction and the width direction of the absorbent core 40 are respectively the longitudinal direction X and the width direction of the napkin 1 (absorbent article). Since it corresponds to Y, the longitudinal direction and the width direction of the absorbent body 14 and the longitudinal direction and the width direction of the absorbent core 40 are also expressed as the longitudinal direction X and the width direction Y, respectively. 2, 3, and 6, the core wrap sheet is not shown, but the core wrap sheet absorbs at the position of the compression portion 6 as the local high-density portion in these drawings. Along with the sexual core 40, the absorbent body 14 is recessed from the skin facing surface P side toward the non-skin facing surface Q side. Note that FIGS. 6A and 6B are collectively referred to as FIG.

  As shown in FIGS. 2 and 3, the absorbent core 40 has a pair of side regions 45, 45 located on both sides of the absorbent core 40, a pair of side regions 45, 45 and a central region 41 having a larger basis weight than each of the side regions 45. As shown in FIG. 3, the central region 41 in the present embodiment is formed in an oval shape in plan view, and is formed in the central portion in the width direction Y of the absorbent core 40. As shown in FIG. 3, the central region 41 is preferably formed in a vertically long shape in which the length along the longitudinal direction X of the absorbent core 40 is longer than the length along the width direction Y of the absorbent core 40. The pair of side regions 45, 45 are formed on both sides in the longitudinal direction X of the absorbent core 40 so as to extend in the longitudinal direction X of the absorbent core 40. As shown in FIG. 3, the side region 45 is formed so as to extend along the side end portions 41 s to the outside of the both side end portions 41 s of the central region 41, and the side end portions 41 s of the central region 41. , And a linear outer end 45b constituting a part of the side edge of the absorbent core 40. The shape of the central region 41 in plan view may be other shapes such as an elliptical shape, a vertically long rectangular shape, an elliptical shape with a constricted central portion or a vertically long rectangular shape, a square shape, and a circular shape instead of the elliptical shape. .

As shown in FIG. 2, the central region 41 of the absorbent core 40 in the present embodiment is a thick region that is thicker than each of the side regions 45 on both sides. As shown in FIG. 2, the central region 41 preferably has a thickness larger than that of the side region 45 over the entire region in the width direction Y of the absorbent core 40.
Moreover, in this embodiment, the center area | region 41 which is a thick area | region forms the protrusion part 5 which protrudes in the surface at the skin opposing surface side in the absorptive core 40. As shown in FIG. The protrusion 5 is formed of a part of the central region 41 in the thickness direction. Further, the central region 41 and the protruding portion 5 that is a part of the central region 41 are located between the pair of side regions 45 in the width direction Y of the absorbent core 40, and the absorbent core 40. In the plan view, the absorbent core 40 has a long shape in the longitudinal direction X. In the present embodiment, each of the central region 41, the protruding portion 5, and the pair of side regions 45 has a length along the longitudinal direction X of the absorbent core 40 longer than a length along the width direction Y of the absorbent core 40. It is formed in a vertically long shape.

  Moreover, the center area | region 41 and the side area | region 45 are formed in the excretion part opposing part B at least in absorbent articles, such as the napkin 1. FIG. In the example shown in FIG. 1, it is formed from the vicinity of the front end of the excretory part facing part B to a part of the rear part C. The central region 41 and the side region 45 are preferably formed over a length of 20% to 80% of the total length in the longitudinal direction X of the absorbent core 40. More preferably, it is formed over a length of 30% to 70%. In the present invention, with respect to the longitudinal direction X, only the region existing outside in the width direction of the region where the central region 41 exists is referred to as a side region 45.

  Further, as shown in FIGS. 2 and 3, the napkin 1 according to the present embodiment is locally localized in the side region 45 of the absorbent core 40 that is recessed from the skin facing surface P side toward the non-skin facing surface Q side. A plurality of compression portions 6 as high density portions are formed in a dotted pattern with a space between each other. Here, the compression part is a local high-density part in the present invention, and means a part whose density is higher than that of the periphery in plan view. In each of the compression parts 6, the absorbent core 40 and the core wrap sheet 14 c that covers the skin facing surface P side of the absorbent core 40 are integrated from the skin facing surface P side toward the non-skin facing surface Q side. The compression portion 6 is increased in density. Moreover, the compression part 6 is arrange | positioned disperse | distributing to the longitudinal direction X and the width direction Y of the absorptive core 40. As shown in FIG. That is, the compression part 6 in the side region 45 has a higher density than the surrounding part. In the napkin 1, the compression part 6 is not formed in the central region 41.

As shown in FIG. 4A, in the compression unit 6 in the present embodiment, the shape of each compression unit 6 is circular in the plan view of the absorbent core 40, and the plurality of compression units are arranged in a staggered manner. It is formed with a pattern. More specifically, in each of the side regions 45 on both sides of the central region 41, there is a longitudinal compression portion row 6x in which the compression portions 6 are arranged in series at intervals in the longitudinal direction X of the absorbent core 40. A plurality of rows are formed in the lateral direction of the absorbent core 40, and the positions in the longitudinal direction X of the compression portions 6 of the adjacent longitudinal compression portion rows 6x are shifted by a half pitch. FIG. 4B is a view showing another preferred example of the arrangement of the compression portions 6, and the compression portion rows 6 x in which the compression portions 6 are arranged in series at intervals in the longitudinal direction X of the absorbent core 40. Are formed in a plurality of rows in the lateral direction of the absorbent core 40, and the positions in the longitudinal direction X of the compression portions 6 of the adjacent longitudinal direction compression portion rows 6x coincide.
The compression unit 6 preferably has a circular shape in plan view, but may have a non-circular shape such as an ellipse, an oval, a square, a rectangle, or a triangle. In addition, as for an ellipse and an ellipse, it is preferable that the length of a major axis is 3.0 times or less of the length of a minor axis.

In each arrangement shown in FIGS. 4A and 4B, the arrangement pitch P1 of the compression sections 6 in each longitudinal compression section row 6x is preferably 110% with respect to the diameter L6 of the compression sections 6. More preferably, it is 120% or more, preferably 350% or less, more preferably 340% or less, and preferably 110% or more and 350% or less, more preferably 120% or more and 340% or less. Further, the arrangement pitch P2 of the longitudinal direction compression portion rows 6x in the width direction Y of the absorbent core 40 is preferably 110% or more, more preferably 120% or more, and preferably with respect to the diameter L6 of the compression portion 6. Is 350% or less, more preferably 340% or less, preferably 110% or more and 350% or less, more preferably 120% or more and 340% or less. Moreover, the diameter L6 of the compression part 6 becomes like this. Preferably it is 1.0 mm or more, More preferably, it is 1.5 mm or more, Preferably it is 5.0 mm or less, More preferably, it is 4.0 mm or less. It is 0 mm or more and 5.0 mm or less, More preferably, it is 1.5 mm or more and 4.0 mm or less.
When the compression portion 6 has a shape other than a circle, the longer one of the length in the longitudinal direction X and the length in the width direction Y of the compression portion 6 is set to the length of the “diameter”. Replace it. For example, in the case of an elliptical compression part inclined with respect to the longitudinal direction X, the compression part is divided into a component in the longitudinal direction X and a component in the width direction Y, and each length is the length of the longitudinal component X And the length of the Y component in the width direction, the longer one of which is the length of the “diameter”. In addition, the arrangement pitch P1 of the compression sections 6 in the longitudinal compression section row 6x is the length between the center points of the components in the longitudinal direction X of the compression sections 6, and the arrangement pitch P2 of the compression sections 6 in the width direction Y is The length between the center points of the components in the horizontal direction Y of the compression unit 6 is used.

  In the napkin 1 of the present embodiment, it is preferable that a plurality of compressed portions having different arrangement positions in the width direction Y of the absorbent core 40 are formed in each of the pair of side regions 45. In the region 45, it is preferable that two or more longitudinal compression portion rows 6x are formed.

  The absorbent body 14 of the napkin 1 described above includes, for example, an accumulation recess 65 on the outer peripheral surface, and a stacking drum 64 that rotates in one direction R, and an absorbent core forming material on the outer peripheral surface of the stacking drum 64. Using the fiber stacking device 63 (see FIG. 5) provided with the duct 69 supplied in a scattered state, as shown in FIG. 6 (a), a thick central region in the central portion in the direction CD orthogonal to the transport direction MD 40A is manufactured, and after this 40A is covered with a core wrap sheet (not shown), it is manufactured by embossing as shown in FIG. 6 (b). Can do. More specifically, the example shown in FIG. 6A and FIG. 6B will be described. After covering the stacked fiber body 40A having the thick central region 41 with a core wrap sheet (not shown), An embossing device comprising an embossing roll 71 provided with a recess 72 in a part of the peripheral surface and an embossing convex part 75 in a portion other than the recess 72 on the peripheral surface, and an anvil roll 73 facing the embossing roll 71 The side portions of the fiber stack 40A are partially pressed between the convex portion 75 and the peripheral surface of the anvil roll 73, so that the side portions of the stacked body 40A are shown on the side portions. The absorbent body 14 of the napkin 1 in which a large number of the compression parts 6 are formed in the pattern shown in 3 is obtained.

The napkin 1 according to the present embodiment includes a surface sheet 11 </ b> A shown in FIG. 7 as the surface sheet 11.
The surface sheet 11A shown in FIG. 7 has a plurality of high protrusions 31 and a plurality of low protrusions 32 having a height lower than that of the high protrusions 31 as the protrusions 3 protruding toward the wearer's skin. . The high convex portion 31 is a convex portion having a high height in comparison with the low convex portion 32.
Further, the low convex portions 32 in the top sheet 11 </ b> A have a higher density than the high convex portions 31. Further, the top sheet 11A has an upper fiber layer 1u and a lower fiber layer 1d laminated together, and the upper fiber layer 1u and the lower fiber layer 1d are formed by heat fusion formed in the manner shown in FIGS. The parts 2 are joined to each other. Further, the lower fiber layer 1d has a higher density than the low convex portion 32 in the topsheet 11A.

More specifically, the topsheet 11A includes a heat-shrinkable fiber layer 1d that includes heat-shrinkable fibers and a heat-shrinkable fiber content that is not contained or less than that of the heat-shrinkable fiber layer 1d. A non-heat-shrinkable fiber layer 1u, and the heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u are heat-bonded portions 2 as a fusion-bonded portion formed by embossing and fused by a plurality of heats. (Hereinafter also referred to as the embossed portion 2). The expression “heat-shrinkable fiber” includes both heat-shrinkable heat-shrinkable fibers and heat-shrinkable fibers before heat-shrinking. In the topsheet 11A, the heat-shrinkable fiber layer 1d corresponds to the lower fiber layer 1d, and the non-heat-shrinkable fiber layer 1u corresponds to the upper fiber layer 1u.
The surface sheet 11A is obtained by partially joining the heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u by embossing, and then shrinking the heat-shrinkable fiber layer 1d, thereby joining the joint 2 in the non-heat-shrinkable fiber layer 1u. The convex part 3 is formed by projecting the other part to the skin side, and the part formed by embossing is present at the bottom part formed between the convex parts 3.

  Each density of the high convex part 31, the low convex part 32, and the lower fiber layer 1d is formed so that the low convex part 32 is higher than the high convex part 31. In addition, it is preferable that the lower fiber layer 1 d is formed higher than the low convex portion 32. Here, each density of the top sheet 11A represents the density of fibers constituting the top sheet.

  D2 / d1, which is the ratio of the density d2 of the low protrusions 32 to the density d1 of the high protrusions 31, is preferably 1.2 or more, more preferably 1.5 or more, and preferably 5.0 or less. Preferably it is 3.0 or less, Preferably it is 1.2 or more and 5.0 or less, More preferably, it is 1.5 or more and 3.0 or less.

  When the density of the lower fiber layer 1d is higher than that of the low convex portion 32, the liquid that has migrated to the low convex portion 32 due to capillary action is likely to migrate to the lower fiber layer 1d, thereby preventing liquid from returning to the skin. Excellent. D3 / d2, which is the ratio of the density d3 of the lower fiber layer 1d to the density d2 of the low protrusions 32, is preferably 1.2 or more, more preferably 1.5 or more, and preferably 5.0 or less, Preferably it is 3.0 or less, Preferably it is 1.2 or more and 5.0 or less, More preferably, it is 1.5 or more and 3.0 or less. A method for measuring the ratio of each density of the topsheet will be described later.

  Further, as shown in FIGS. 8 and 9, the top sheet 11 </ b> A has a liquid flow path R that connects the high convex portion 31 and the low convex portion 32 around each high convex portion 31. In the topsheet 11A, four passage paths R are formed around all the high convex portions 31, but in FIG. 8, four liquid passages existing around one high convex portion 31 are formed. Only the path R is shown.

  As shown in FIG. 9, the top sheet 11 </ b> A has a large polygonal region BT surrounded by the plurality of heat fusion portions 2 and a smaller area than the large polygonal region BT, and is surrounded by the plurality of heat fusion portions 2. Each has a plurality of small polygonal areas ST, a high convex part 31 is formed at the central part of the large polygonal area BT, and a low convex part 32 is formed at the central part of the small polygonal area ST. . Further, the large polygon region BT and the small polygon region ST are adjacent to each other by sharing a plurality (two) of the heat fusion portions 2. Further, a gap 25 having no heat fusion part is formed between the two heat fusion parts 2 and 2 shared by the adjacent large polygonal area BT and small polygonal area ST. Even in the portion located in the gap 25, the topsheet 11 </ b> A protrudes toward the wearer's skin side in comparison with the heat fusion parts 2 and 2 located on both sides of the gap 25, and is adjacent to each other. Connecting protrusions that continuously protrude from the high convex portion 31 to the low convex portion 32 between the high convex portion 31 and the low convex portion 32 formed in the large polygon region BT and the small polygon region ST. A portion 33 is formed. And the inside of the connection convex part 33 becomes the liquid flow path R in which a liquid moves toward the low convex part 32 from the high convex part 31. FIG.

  Further, in the topsheet 11A, as shown in FIG. 8, a large polygon region row BTL formed by arranging a plurality of large polygon regions BT adjacent to each other along the first direction Ya, and a plurality of small polygons The small polygonal region rows STL configured such that the regions ST are arranged adjacent to each other along the first direction Ya are alternately arranged in the second direction Xa orthogonal to the first direction Ya.

The napkin 1 of the present embodiment is used by being fixed to the crotch portion of the shorts in the same manner as a normal sanitary napkin.
In the excretion part facing part B of the napkin 1, since the central area 41 having a higher basis weight and a thicker thickness than the lateral area 45 is disposed, the central area 41 has a large absorption capacity and is used in the excretion part of the wearer. It is easy to fit. Therefore, when a liquid such as menstrual blood is discharged onto the top sheet 11 of the excretory part facing portion B of the napkin 1 while the napkin 1 is worn, the liquid is quickly absorbed into the central region 41.
At this time, if the viscosity of the liquid is high, the liquid is likely to remain on the top sheet 11, but the top sheet 11 has the high convex portion 31 and the low convex portion 32 having different heights, and the convex portion 3 is in contact with the skin. In addition to a small area, a part of the liquid drawn into the high convex portion 31 passes through the liquid flow path R formed in the connecting convex portion 33 as shown in FIG. In order to move to the high-density low convex portion 32 by a density gradient, the liquid remaining near the top of the high convex portion 31 is quickly transferred to a site that is difficult to contact the wearer's skin, and finally the absorber. 14 can be efficiently absorbed.
And since it has the side area | region 45 which formed the compression part 6 in the both sides of the center area | region 41 and this compression part 6 is increased in density, a liquid is in the surface sheet 11 or the surface sheet 11 and an absorber. Even if it flows toward the edge in the width direction Y of the napkin 1, the liquid is smoothly absorbed into the absorbent core 40 through the compression portion 6 and its vicinity. Further, in the side region 45, the liquid easily moves to the low convex portion 32 having a higher density than the high convex portion 31 due to the density gradient, and the compression portion 6 in which the density of the absorber core 40 in the side region 45 is high. Therefore, the liquid of the low convex portion 32 is more easily transferred to the absorbent core 40, and is difficult to return in the side region 45, so that the liquid is less likely to contact the wearer's skin. Furthermore, since a plurality of the compression parts 6 are formed in a state of being dispersed in the longitudinal direction X and the width direction Y of the absorbent core 40, it is possible to make the absorbent core 40 hard by forming the compression part 6. Prevents and wears well.
In this way, according to the napkin 1 of the present embodiment, the absorbent core 40 has a high basis weight, and not only the central region 41 with a large thickness, but also the absorption performance of the outer side portion thereof can be effectively utilized. It is possible to effectively prevent the liquid from reattaching to the skin on both the region 41 and the side region 45. Preventing the liquid from re-adhering to the skin can prevent stickiness and discomfort, and can effectively prevent itching caused by excessively moist skin. it can.
Moreover, it can suppress that a liquid flows along the surface of a skin opposing surface, and it can also prevent that a side leak arises.

Moreover, the absorptive core 40 in the napkin 1 of this embodiment is integrally formed with the side areas 45 and 45 and the center area 41. Thereby, the liquid excreted in the central region 41 is easily transferred to the side region 45, and the entire absorbent core 40 is easily used effectively.
In this specification, “integrally molded” means that it is configured as a continuous integral body, which is different from the case where members manufactured in different processes are joined by a bonding means such as an adhesive or compression. Means. Therefore, there are no adjacent portions or connecting portions between the cores produced when two separately manufactured absorbent cores are arranged side by side at the boundary portion between the central region 41 and the side region 45. Moreover, in the napkin 1 of this embodiment, the whole absorptive core 40 is integrally molded, and in the center area | region 41, the upper part which forms the protrusion part 5, and the lower part nearer to the skin side than it Similarly, there are no adjacent portions or connecting portions between the layers.

  Moreover, in the napkin 1 of this embodiment, as shown in FIG. 3, while the compression part 6 is formed in the side area | region 45, in the center area | region 41, especially the center area | region 41 used as the thick part, Not formed. Not providing the compression unit 6 in the central region 41 has an advantage that it is difficult to retain the liquid in the central region 41 and the liquid is easily transferred to the side region 45.

  Further, the top sheet 11A used in the napkin 1 of the present embodiment forms a large polygon region BT and a small polygon region ST by the heat fusion part 2 formed by embossing, and the large polygon region BT and the small polygon are formed. By the method of forming the connecting convex part 33 continuously rising from the high convex part 31 to the low convex part 32 between the high convex part 31 and the low convex part 32 formed in the region ST, Since the liquid flow path R is formed inside the connecting convex part 3, the shape of the high convex part 31 and the low convex part 32 can be stabilized without hardening the topsheet 11A, and the wearer's The state in which the liquid is difficult to return to the skin is stably maintained.

  In addition, as such a large polygon region and a small polygon region, a large polygon region BT formed in a hexagonal shape surrounded by six heat fusion portions and a square surrounded by four heat fusion portions. When forming a small polygon region ST formed in a shape and paying attention to one large polygon region BT, a plurality of small polygon regions ST are adjacent to each other around the large polygon region. Since a plurality of liquid flow paths R are connected around the high convex portion 31 in the square region BT, the effect of liquid transfer due to the density gradient between the high convex portion 31 and the low convex portion 32 described above is more efficiently exhibited. can do. Moreover, the shape of the high convex part 31 and the low convex part 32 can be stabilized while preventing the surface sheet 11A from becoming harder more effectively, and the state in which the liquid does not easily return to the wearer's skin is further increased. It is reliably maintained. In the topsheet 11A shown in FIG. 8, four liquid passages R are connected around the high convex portions 31 in each large polygonal region BT, but formed around the high convex portions 31. There is no restriction | limiting in the number of the liquid flow path R to be performed, For example, they are 1 or more and 15 or less, Preferably they are 2 or more and 12 or less.

  The effect of the napkin 1 of the present embodiment described above is due to the case where the region having the high convex portion 31 and the low convex portion 31 of the topsheet 11A exists on the central region 41 and the side region 45 of the absorbent core 40. Played reliably. However, it is not necessary that all the low convex portions 32 overlap with the compression portion 6.

  Moreover, in the napkin 1 of this embodiment, the compression part 6 is formed in the surface at the skin opposing surface P side of the absorptive core 40, and in the compression part 6, the absorptive core 40 and this absorptive core 40 are comprised. The core wrap sheet 14c to be covered is recessed from the skin facing surface P side toward the non-skin facing surface Q side. Therefore, the liquid can be easily retained on the non-skin facing surface Q side of the absorbent core 40, and the liquid return prevention property is excellent. In addition, the compression part 6 may be formed in the surface at the non-skin opposing surface Q side of the absorptive core 40. FIG. In that case, in the compression part 6, the core wrap sheet | seat which coat | covers the absorptive core 40 and this absorptive core 40 may be dented integrally toward the skin opposing surface P side from the non-skin opposing surface Q side. preferable. Moreover, the compression part 6 may be formed in both surfaces of the surface at the skin opposing surface P side, and the surface at the non-skin opposing surface Q side.

  Moreover, the effect of the napkin 1 of this embodiment mentioned above is more reliably show | played when it has the several low convex part 32 which overlaps with the compression part 6 as the low convex part 32. FIG. The overlap with the compression part 6 is only required that the low convex part 32 has an overlapping part with at least a part of the compression part 6 when the napkin 1 is viewed in plan view. The liquid transferred to 1d is more easily drawn in by the compression part 6 of the absorbent core 40, and the liquid return preventing property to the skin is further improved. In order to exhibit the effect, it is preferable that 30% or more of the plurality of low protrusions 32 overlap with the compression part 6, and 40% or more of the plurality of low protrusions 32 overlap with the compression part 6.

Further, the top sheet 11A of the napkin 1 of the present embodiment has an upper fiber layer 1u and a lower fiber layer 1d laminated together, and the upper fiber layer 1u and the lower fiber layer 1d are mutually bonded in the heat-sealing part 2. Since they are joined and formed, the high convex portion 31 and the low convex portion 32 are each excellent in shape stability.
Further, the lower fiber layer 1d is a heat-shrinkable fiber layer containing heat-shrinkable fibers, and the heat-shrinkable fiber is in a state where the upper-layer fiber layer 1u and the heat-shrinkable fiber layer 1d are partially joined at the heat-sealing portion 2. Since the high convex portion 31 and the low convex portion 32 are formed by heat shrinking the layer 1d, the high convex portion 31 and the low convex portion 32 are excellent in shape stability and have high liquid permeability. Since the convex part 33 and the liquid flow path R can be formed, the liquid return prevention property with respect to skin improves further, and since it is excellent in the recovery | restoration property with respect to compression, etc., a soft touch is obtained and it is excellent also in a mounting feeling. In addition, as the aspect that “the high convex portion and the low convex portion are formed by heat shrinking the heat shrinkable fiber layer”, the height of the convex portion by embossing and subsequent hot air treatment is given. This includes the case where high and low convex portions are formed due to the increase.

From the viewpoint of more easily obtaining the above-described one or more effects, the absorbent article of the present invention preferably has the following one or two or more configurations.
Moreover, as for the absorptive core 40, it is preferable that the basic weight of the center area | region 41 is 1.2 times or more of the basic weight of the side area | region 45, More preferably, it is 1.5 times or more, Preferably, it is 3 0.5 times or less, more preferably 3.0 times or less, and preferably 1.2 times or more and 3.5 times or less, more preferably 1.5 times or more and 3.0 times or less.

  The density of the central region 41 may be higher or lower than the density of the side region 45 or may be the same, but the density of the central region 41 is not less than 20% of the density of the side region 45 and is 300. % Or less, and more preferably 30% or more and 200% or less of the density of the side region 45.

In the absorbent core 40, the thickness t5 of the side region 45 is preferably 75% or less of the thickness t1 of the central region 41, more preferably 70% or less, and preferably 30% or more, more preferably It is 35% or more, preferably 30% or more and 75% or less, more preferably 35% or more and 70% or less.
The thickness t1 of the central region 41 is preferably 1.5 mm or more, more preferably 2.0 mm or more, preferably 8.5 mm or less, more preferably 8.0 mm or less, and preferably 1. It is 5 mm or more and 8.5 mm or less, More preferably, it is 2.0 mm or more and 8.0 mm or less.

Moreover, it is preferable from the point of liquid transferability that the density of the part in which the compression part 6 is not formed in the side area | region 45 is more than the density of the center area | region 41. The density of the portion where the compression portion 6 is not formed is obtained based on the thickness of the portion where the compression portion 6 is not formed in the side region 45.
The thickness t6 (see FIG. 2) of the side region 45 where the compression part 6 is formed is preferably 80% or less, more preferably 75% or less of the thickness t5 of the side region 45. Also, it is preferably 10% or more, more preferably 20% or more, and preferably 10% or more and 80% or less, more preferably 20% or more and 75% or less.

The thickness of each part of the absorbent core 40 is determined by cutting the absorbent core 40 or the absorbent body 14 including the absorbent core 40 along the width direction of the absorbent core 40 using a razor blade, and cutting the absorbed core. The cross-section of the conductive core 40 is measured by applying a load of 0.5 gf / cm ² and enlarging the magnification to 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).
The thickness of each part of the absorbent core 40 and the width of each part to be described later are measured at the center position of the central region 41 in the napkin longitudinal direction X (the position indicated by IIa in FIGS. 1 and 1).
The density of each part is the thickness obtained by observing the cross section of the absorbent core 40 and the flat area and mass of each measurement piece in the central region and the lateral region cut out to include the entire thickness direction of the absorbent core. Calculate from

  As for the width W1 (refer FIG. 2) of the center area | region 41 and the protrusion part 5, the ratio with respect to the width W of the absorptive core 40 becomes like this. Preferably it is 20% or more, More preferably, it is 30% or more, Preferably, it is 80 % Or less, more preferably 70% or less, preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less. The width W2 (see FIG. 2) of the central region 41 or the protrusion 5 is preferably 10 mm or more, more preferably 15 mm or more, preferably 60 mm or less, more preferably 50 mm or less, and preferably Is from 10 mm to 60 mm, more preferably from 15 mm to 50 mm.

As the absorbent body 14, various kinds of conventionally used absorbent bodies for absorbent articles can be used without particular limitation, but like the absorbent body 14 of the napkin 1 described above, the absorbent core 40, What is comprised from the core wrap sheet | seat 14c which wraps this absorptive core is preferable.
The absorbent core 40 and the stacked fiber body 40A used for manufacturing the absorbent core 40 may be, for example, a stacked fiber body of liquid absorbent fibers such as pulp fibers, or a mixed fiber body of the liquid absorbent fibers and the water absorbent polymer. It may be. Examples of the liquid-absorbing fibers constituting the absorbent core include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate. These fibers can be used alone or in combination of two or more. In addition to cellulose-based hydrophilic fibers, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide may be included. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. Each of the fibers and the water-absorbing polymer can be used alone or in combination of two or more.

  The entire or part of the absorbent core 40 is preferably pulp fibers, and the ratio of the pulp fibers to the total fibers contained in the absorbent core 40 is preferably 50 to 100% by mass, more preferably 80 to It is 100 mass%, More preferably, it is 100 mass%. In addition to the superabsorbent polymer, the absorbent core may contain a deodorant or an antibacterial agent as necessary. Moreover, the absorber 14 may consist only of the absorbent core 40.

The above-described top sheet 11A will be further described with reference to FIGS. The Xa direction in these drawings is the second direction of the top sheet, and is the same direction as the machine direction (MD direction) and the longitudinal direction X of the napkin 1 when the top sheet is manufactured. Moreover, Ya direction in a figure is a 1st direction orthogonal to a 2nd direction, the same direction as the direction (CD direction) orthogonal to the machine direction (MD direction) at the time of surface sheet manufacture, and the width direction Y of the napkin 1 It is. The Z direction in the figure is the thickness direction.
The topsheet 11A has a heat-shrinkable fiber layer 1d containing heat-shrinkable fibers that have been heat-shrinked, and is a sheet on which a plurality of embossed portions 2 are formed. More specifically, the top sheet 11A of the napkin 1 has a heat-shrinkable fiber layer 1d, and further has a non-heat-shrinkable fiber layer 1u made of non-heat-shrinkable fibers laminated on the heat-shrinkable fiber layer 1d. Further, the top sheet 11A is formed by disposing the non-heat-shrinkable fiber layer 1u on the skin facing surface side and the heat-shrinkable fiber layer 1d on the non-skin facing surface side.

  The heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u of the topsheet 11A are intermittently joined by a plurality of embossed portions 2. Specifically, the surface sheet 11A has a heat-shrinkable fiber layer 1d and a non-heat-shrinkable fiber layer 1u partially bonded by a plurality of regularly arranged embossed portions 2 and bonded together. The heat-shrinkable fiber of the heat-shrinkable fiber layer 1d on the opposite surface side is formed by heat-shrinking. As shown in FIG. 7, the top sheet 11 </ b> A has a plurality of recesses recessed by the embossed part 2 embossed from the skin facing surface side of the non-heat-shrinkable fiber layer 1 u and a plurality of convex parts on the non-embossed non-embossed part. 3 is formed.

  The topsheet 11A has a plurality of large polygonal regions BT surrounded by a plurality of embossed portions 2, and the embossed portions 2 form the tops of the large polygonal regions BT. Moreover, the surface sheet of the present invention has a plurality of small polygon regions ST smaller in area than the large polygon region BT surrounded by the embossed portions 2 forming the tops of the plurality of large polygon regions BT. It also forms the top of the small polygon region ST. Thus, the surface sheet of the present invention is formed with a polygonal region (large polygonal region BT, small polygonal region ST) surrounded by a plurality of embossed portions 2, and the polygonal region (large polygonal region BT, The inside of the small polygon region ST) is a non-embossed portion. More specifically, as shown in FIG. 7 and FIG. 8, the polygonal region is adjacent to a plurality of large polygonal regions BT having a relatively large area and having a plurality of embossed portions 2 as the top. And a plurality of small polygonal regions ST having an area smaller than that of the large polygonal region BT surrounded by the embossed portion 2 forming the top of the plurality of large polygonal regions BT. Thus, the large polygon region BT and the small polygon region ST adjacent thereto have the embossed portion 2 as a common top portion. In this specification, “the embossed portion 2 is the top” or “the embossed portion 2 is the apex” does not mean that the embossed portion 2 as a whole is the apex. This includes the case where a part of part 2 is a vertex. In the topsheet 11A of the present embodiment, a part of the embossed portion 2 is a vertex of each polygonal region, and the remaining part excluding the vertex of the embossed portion 2 is a part of the side that forms the outer shape of each polygonal region. ing. In addition, the expression “surrounded by the embossed part” does not mean an area formed inside the embossed part, but means an area formed including the embossed part.

  Specifically, in the topsheet 11A of the present embodiment, the large polygonal region BT is surrounded by the six embossed portions 2 forming the top as shown in FIGS. 9 and 10, and the outer shape is a hexagonal shape. It has become. On the other hand, the small polygonal region ST is surrounded by the four embossed portions 2 forming the top, and the outer shape is a square shape. Then, with respect to the first direction (Ya direction), two adjacent large polygonal regions BT, BT are two embossed portions 2 (2) of the six embossed portions 2 constituting each large polygonal region BT. The two other embossed portions 22, which will be described later, are shared, and are separated from each other by sides connecting the two embossed portions 2, 2 (two other embossed portions 22 described later). As for the second direction (Xa direction), two adjacent large polygonal regions BT, BT are one embossed portion 2 (intermediate to be described later) of the six embossed portions 6 constituting each large polygonal region BT. The embossed portion 21) is shared and separated from each other by the one embossed portion 2 (intermediate embossed portion 21 described later). One rectangular small polygon region ST is surrounded by four hexagonal large polygon regions BT. The adjacent small polygon region ST and each large polygon region BT share two embossed portions 2 (the intermediate embossed portion 21 described later and the other embossed portion 22 described later) of the six embossed portions 6, and the 2 Two embossed portions 2 (an intermediate embossed portion 21 described later and another embossed portion 22 described later) are separated from each other. Therefore, in the topsheet 11A, the four embossed portions 2 constituting the small polygon region ST are all shared with the embossed portions 2 constituting the four large polygon regions BT adjacent to the small polygon region ST. ing.

  In the topsheet 11A, as shown in FIGS. 7 and 8, a large polygon region row BTL is formed in which a plurality of large polygon regions BT are arranged adjacent to each other along the first direction (Ya direction). ing. Moreover, in the surface sheet of the present invention, a small polygon region row STL is formed in which a plurality of small polygon regions ST are arranged adjacent to each other along the first direction (Ya direction). The large polygon region row BTL and the small polygon region row STL are alternately arranged in a second direction (Xa direction) orthogonal to the first direction (Ya direction). That is, the large polygon region row BTL, the small polygon region row STL, the large polygon region row BTL,... Are alternately arranged along the second direction (Xa direction).

  As shown in FIG. 7, in the topsheet 11A, high convex portions 31 having a relatively high height are formed in each large polygonal region BT. In the topsheet 11A, a plurality of high convex portions 31 are arranged along the first direction (Ya direction) to constitute a high convex portion row 31L. On the other hand, in each small polygon area ST, a low convex portion 32 having a height lower than that of the high convex portion 31 is formed. In the topsheet 11A, a plurality of low convex portions 32 are arranged along the first direction (Ya direction) to form a low convex portion row 32L. The high convex portion rows 31L and the low convex portion rows 32L are alternately arranged in a second direction (Xa direction) orthogonal to the first direction (Ya direction). That is, along the second direction (Xa direction), the high convex portion rows 31L, the low convex portion rows 32L, the high convex portion rows 31L,. And the high convex part 31 of the high convex part row | line 31L and the low convex part 32 of the low convex part row | line | column 32L are arrange | positioned on the surface sheet 11A in zigzag form. In other words, the high protrusions 31 and the low protrusions 32 are alternately arranged in a diagonal direction with respect to each of the first direction (Ya direction) and the second direction (Xa direction). The high convex portion 31 and the low convex portion 32 will be described in detail later.

  In the topsheet 11A of the present embodiment, as shown in FIGS. 7 and 8, the embossed portion 2 is between the two high convex portions 31 and 31 located closest to each other in the second direction (Xa direction). In addition, the intermediate embossed portion 21 is provided between the two low convex portions 32 and 32 located closest to each other in the first direction (Ya direction). Specifically, with respect to the second direction (Xa direction), between the two closest high convex portions 31 and 31 among the high convex portions constituting the closest high convex portion rows 31L and 31L, and Of the two low convex portions 32, 32 closest to each other in the first direction (Ya direction) constituting the low convex portion row 32L positioned between the high convex portion rows 31L, 31L closest in the second direction (Xa direction) There is one intermediate embossed portion 21 between them. In the surface sheet 11 </ b> A, the plurality of embossed portions 2 are composed of two types of embossed portions, the first is the intermediate embossed portion 21, and the second is the remaining other embossed portions 22 excluding the intermediate embossed portion 21. is there. In the present specification, “one embossed portion” means an embossed shape that can be regarded as one in appearance, and even if the embossed portion is composed of a plurality of dots or broken lines, "Embossed part of".

  As shown in FIGS. 8 and 9, each of the intermediate embossed portions 21 includes four small polygon regions ST, ST that are adjacent to each other in the first direction (Ya direction). Six embossed portions 6 that are shared as one embossed portion 2 of the embossed portions 6 and constitute each polygonal region BT by hexagonal large polygonal regions BT, BT adjacent in the second direction (Xa direction). Is shared as one embossed portion 2. Accordingly, each of the intermediate embossed portions 21 is disposed at an intermediate position between the two low convex portions 32 and 32 that are closest to each other in the first direction (Ya direction), and the two highest heights that are closest to each other in the second direction (Xa direction). It is arranged at an intermediate position between the convex portions 31 and 31.

  As shown in FIG. 11 and FIG. 12, each intermediate embossed portion 21 is formed from each central polygon at the center of the top that forms the vertices of the two large polygonal regions BT that are closest to each other in the second direction (Xa direction). A bi-directionally extending shape portion 21a extending along the side forming the outer shape of the region BT is provided. As described above, in the topsheet 11A, the large polygonal regions BT and BT adjacent to each other in the second direction (Xa direction) share one top. In the topsheet 11A, the tops of the rectangular small polygonal areas ST are all shared with the tops of the hexagonal large polygonal areas BT adjacent to the small polygonal areas ST. Therefore, the two-direction extending shape portions 21a and 21a adjacent to each other in the second direction (Xa direction) are in contact with each other, and the intermediate embossed portion 21 has one hexagonal shape adjacent to the second direction (Xa direction) from the apex. Along the side forming the outer shape of the large polygonal region BT and along the side forming the outer shape of the other hexagonal large polygonal region BT adjacent in the second direction (Xa direction) from the apex. Are formed in a four-direction extending shape, that is, in an X-shape. The X-shaped intermediate embossed portion 21 has a shape in which four projecting portions 21e extend from the apex in plan view. The four projecting portions 21e have the same length, and the X-shaped intermediate embossed portion 21 has a line parallel to a first direction (Ya direction) passing through the center point and a second direction passing through the center point. Each line parallel to (Xa direction) has a line-symmetric shape.

  In the X-shaped intermediate embossed portion 21, the crossing angle θ1 (see FIG. 11) between the protruding portions 21e in the second direction (Xa direction) reduces the contact area with the skin in the top sheet 11A and provides a good touch. From the viewpoint of maintaining and improving the visual impression, it is preferably 50 ° or more, particularly preferably 70 ° or more, and preferably 170 ° or less, particularly preferably 130 ° or less, more specifically 50 ° or more. It is preferably 170 ° or less, and more preferably 70 ° or more and 130 ° or less. In the top sheet 11A, the intersection angle θ1 is 90 °.

  As shown in FIG. 8, each other embossed portion 22 has a center of the top of the small polygon region ST sharing one top and the two large polygonal regions BT and BT adjacent in the first direction (Ya direction). A part of the outer shape of the rectangular small polygonal region ST is formed from the apex as a point, and extends along a side forming a part of the outer shape of one hexagonal large polygonal region BT; and A part of the outer shape of the rectangular small polygonal region ST is formed from the vertex that is the center point of the top part, and extends along a side that forms a part of the outer shape of the other hexagonal large polygonal region BT. And extending in three directions extending along a side forming a part of the outer shape of one hexagonal large polygonal region BT and forming a part of the outer shape of the other hexagonal large polygonal region BT. It is formed into a shape, that is, a Y shape. The other embossed portion 22 in the Y shape has a shape in which three projecting portions 22e extend from the vertex that is the center point of the top portion in plan view. The three protrusions 22e have the same length, and the Y-shaped other embossed portion 22 has a line-symmetric shape with respect to a line parallel to the second direction (Xa direction) passing through the center point. It has become.

  In the other embossed portion 22 in the Y shape, the intersection angle θ2 (see FIG. 10) between the protruding portions 22e reduces the contact area with the skin in the top sheet 11A, maintains a good touch, and has a good visual impression. From the viewpoint of making it, preferably it is 50 ° or more, particularly preferably 70 ° or more, and preferably 170 ° or less, particularly preferably 130 ° or less, more specifically, preferably 50 ° or more and 170 ° or less, More preferably, it is 70 ° or more and 130 ° or less. In the topsheet 11A, the crossing angle θ2 is 130 °.

  In the topsheet 11A, each of the four protrusions 21e of the X-shaped intermediate embossed portion 21 and the three protrusions 22e of the Y-shaped other embossed portion 22 has the length of the liquid in the topsheet. From the viewpoint of improving drawability and diffusibility and emotional properties, it is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 5.0 mm or less, more preferably 4.0 mm or less, more specifically. Is preferably 0.5 mm or more and 5.0 mm or less, and more preferably 0.7 mm or more and 4.0 mm or less. The four protruding portions 21e of the intermediate embossed portion 21 have the same length from the apex that is the center point of the top portion in the topsheet 11A. On the other hand, the three protruding portions 22e of the other embossed portions 22 have the same length from the apex (the center point of the top portion) in the topsheet 11A. However, it is not limited to the said form and length may differ. For example, two of the three protruding portions 22e of the other embossed portion 22 may have the same length and one may be shorter than the other two. In addition, one protrusion part 22e of the three protrusion parts 22e of the other embossed part 22 is distribute | arranged in parallel with the 2nd direction (Xa direction) in 11 A of surface sheets.

Each embossed part 2 (intermediate embossed part 21 and other embossed part 22) has one embossed part 2 (intermediate embossed part) from the viewpoint of improving the drawability and diffusibility of the liquid in the topsheet 11A while maintaining a good touch. area average) parts 21 and other embossed portion 22 is preferably 1 mm ² or more, more preferably 1.5 mm ² or more and, preferably 15 mm ² or less, more preferably 12 mm ² or less, and more specifically, it is preferably 1 mm ² or more 15 mm ² or less, and more preferably 1.5 mm ² or more 12 mm ² or less.

Each embossed part 2 (intermediate embossed part 21 and other embossed part 22) is provided separately and separately at regular intervals in the first direction (Ya direction) and the second direction (Xa direction). Yes. Each embossed portion 2 (intermediate embossed portion 21 and other embossed portion 22) preferably has a density of 1 piece / cm ² from the viewpoint of enhancing the drawability and diffusibility of the liquid in the topsheet 11A and maintaining good touch. More preferably, 2 pieces / cm ² or more, and preferably 32 pieces / cm ² or less, more preferably 16 pieces / cm ² or less, more specifically, 1 piece / cm ² or more and 32 pieces / cm ^2. The number is preferably ² or less and more preferably 2 pieces / cm ² or more and 16 pieces / cm ² or less.

  The distance between the embossed portions 2 (the intermediate embossed portion 21 and the other embossed portions 22) located closest to each other with respect to the first direction (Ya direction) enhances the drawability and diffusibility of the liquid in the topsheet 11A, and looks From the viewpoint of maintaining a good impression and touch, it is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 4.0 mm or less, more specifically 0.00. It is preferably 5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 4.0 mm or less.

  As shown in FIG. 10, one hexagonal large polygonal region BT is formed by two intermediate embossed portions 21 and four other embossed portions 22. The two intermediate embossed portions 21 are arranged on an imaginary bisector Ly1 extending in parallel with a second direction (Xa direction) passing through the center of gravity of the large polygonal region BT in plan view, and the large polygonal region BT Are arranged so as to be symmetric with respect to a virtual bisector Lx1 extending in parallel with a first direction (Ya direction) passing through the center of gravity. The four other embossed portions 22 are arranged on the top of the large polygonal region BT other than the top on which the two intermediate embossed portions 21 are arranged. The two other embossed portions 22 and 22 that are closest to each other in the first direction (Ya direction) are symmetrical with respect to a virtual bisector Ly1 extending in parallel with the second direction (Xa direction) in plan view. It is arranged in. The two other embossed portions 22 and 22 that are closest to each other in the second direction (Xa direction) are symmetrical with respect to a virtual bisector Lx1 that extends in parallel with the first direction (Ya direction) in plan view. It is arranged to become. In this way, the two other embossed portions 22 and 22 that are closest to the Xa direction constituting one hexagonal large polygon region BT are arranged so as to be opposite to each other with respect to the virtual bisector Lx1. Has been.

  As shown in FIG. 11, one rectangular small polygon region ST is formed by two intermediate embossed portions 21 and two other embossed portions 22. The two intermediate embossed portions 21 are arranged on an imaginary bisector Lx2 extending in parallel with a first direction (Ya direction) passing through the center of gravity of the small polygonal region ST in plan view. They are arranged so as to be symmetric with respect to an imaginary bisector Ly2 extending in parallel with a second direction (Xa direction) passing through the center of gravity of the region ST. The two other embossed portions 22 are arranged on a virtual bisector Ly2 extending in parallel with the second direction (Xa direction) in plan view, and are virtual extending in parallel with the first direction (Ya direction). They are arranged symmetrically with respect to the bisector Lx2. In this way, the two other embossed portions 22 and 22 that are closest to the Xa direction constituting one rectangular small polygon region ST are opposite to each other with respect to the virtual bisector Lx2. It is arranged in a Y shape and an inverted Y shape.

As described above, in the topsheet 11A, the tops of the quadrangular small polygonal areas ST are all shared with the tops of the hexagonal large polygonal areas BT adjacent to the small polygonal areas ST.
Therefore, as shown in FIG. 8, with respect to the second direction (Xa direction), the Y-shaped other embossed portions 22 are arranged at equal intervals in the first direction (Ya direction). An X-shaped intermediate embossed portion between the row and the row of the inverted Y-shaped other embossed portions 22 in which the inverted Y-shaped other embossed portions 22 are arranged at equal intervals in the first direction (Ya direction). A row of intermediate embossed portions 21 in which 21 are arranged at equal intervals in the first direction (Ya direction) is arranged. Such an array of three embossed part rows is arranged at equal intervals in the second direction (Xa direction). And about the 1st direction (Ya direction), the X-shaped intermediate | middle embossed part 21 is distribute | arranged to the position corresponding to the middle of two other Y-shaped other embossed parts 22 and 22 about the Ya direction. . Regarding the second direction (Xa direction), the Y-shaped other embossed portion 22 and the reverse Y-shaped other embossed portion 22 adjacent to each other in the Xa direction are arranged on a virtual line extending in parallel to the Xa direction.

  In the embossed portion 2 (intermediate embossed portion 21 and other embossed portion 22), the constituent fibers of the topsheet 11A are consolidated, and the height (thickness) of the topsheet 11A is the highest compared to the unembossed portion. It is low (thin). That is, the fiber density of the recessed part by the embossed part 2 (intermediate embossed part 21 and the other embossed part 22) is higher than the part which is not embossed, and is the highest in the surface sheet 11A. Depending on the embossing conditions, the constituent fibers may be melted and solidified to form a film. For this reason, the embossed portion 2 (the intermediate embossed portion 21 and the other embossed portion 22) affects the hardness of the topsheet 11A and the excretion of the excretory fluid. From this viewpoint, the ratio of the area of the embossed portion 2 to the total area of the top sheet, that is, the embossing rate is preferably 5% or more and 30% or less, and particularly preferably 7% or more and 20% or less. According to the embossing pattern in the topsheet 11A, even with such a low embossing rate, the contact area with the wearer's skin can be reduced.

  In the topsheet 11A formed as described above, as shown in FIG. 8, the high convex portion 31 formed in the hexagonal large polygonal region BT is a convex portion having an elliptical planar shape, The low convex portion 32 formed in the small polygonal region ST is a convex portion having a circular planar shape. Further, the connecting convex portion 33 is formed between the high convex portion 31 formed in the large polygon region BT and the low convex portions 32 formed in the four small polygon regions ST adjacent to the large polygon region BT. Is formed.

The height hb (see FIG. 12) at the apex in the thickness direction (Z direction) of the high convex portion 31 is a viewpoint that the surface sheet 11A has a good touch and enhances the fiber density gradient and enhances the drawability of the liquid. Therefore, it is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 7.0 mm or less, more preferably 5.0 mm or less, and more specifically 1.0 mm or more and 7.0 mm or less. It is preferably 1.5 mm or more and 5.0 mm or less. The height hb of the high convex portion 31 is the maximum height of the high convex portion, but is also generally the height at a position corresponding to the center of gravity of the large polygonal region BT. The height hb is measured in the same manner as the fiber density ratio (1) of the surface sheet 11A described later.
In addition, the rising angle θ3 (see FIG. 13) from the bottom surface of the high convex portion 31 is preferably 70 ° or more, and more preferably from the viewpoint of making it difficult to leave menstrual blood in a portion that touches the skin even during a large amount of menstrual blood. Is 75 ° or more, and preferably 90 ° or less, more preferably 85 ° or less, more specifically 70 ° or more and 90 ° or less, and more preferably 75 ° or more and 85 ° or less. . The ridge angle θ3 is measured simultaneously with the measurement of the height hb.

The height hs (see FIG. 14) at the apex in the thickness direction (Z direction) of the low convex portion 32 enhances the good touch feeling of the top sheet 11A, and enhances the density gradient of the fibers and enhances the drawability of the liquid. From the viewpoint, it is preferably 0.4 mm or more, more preferably 0.8 mm or more, and preferably 4.5 mm or less, more preferably 2.5 mm or less, more specifically 0.4 mm or more and 4.5 mm or less. It is preferable that it is 0.8 mm or more and 2.5 mm or less. The height hs of the low convex portion 32 is the maximum height of the low convex portion 32, but is also the height at a position corresponding to the center of gravity in the small polygonal region ST. The height hs is measured in the same manner as the fiber density ratio (1) of the surface sheet 11A described later.
In addition, the raised angle θ4 (see FIG. 14) from the bottom surface of the low convex portion 32 is preferably 25 ° or more, more preferably from the viewpoint of making it difficult to leave menstrual blood in a portion that touches the skin even during a large amount of menstrual blood. Is 30 ° or more and preferably 70 ° or less, more preferably 65 ° or less, more specifically 25 ° or more and 70 ° or less, and more preferably 30 ° or more and 65 ° or less. . The ridge angle θ4 is measured simultaneously with the measurement of the height hs.

  In the topsheet 11A, the fiber density of the high convex portion 31 of the three-dimensional dome structure is lower than the fiber density of the low convex portion 32 of the three-dimensional dome structure. Reference point) is the lowest in the top sheet 11A. The low convex portion 32 of the three-dimensional dome structure has the lowest fiber density among the low convex portions 32 at the vertex in the Z direction (the reference point of the height hs). As described above, the fiber density at the apex in the Z direction (height hb reference point) of the high convex portion 31 is lower than the fiber density at the apex in the Z direction (reference point of height hs) of the low convex portion 32. ing. Therefore, the excretory fluid is easily transferred from the high convex portion 31 in contact with the wearer's skin to the low density portion. Furthermore, it is located between the low convex portions 32 and 32 adjacent to each other in the first direction (Ya direction), and is located between the high convex portions 31 and 31 adjacent to each other in the second direction (Xa direction). The presence of the embossed portion 21 increases the fiber density around the intermediate embossed portion 21. For this reason, since the excretion liquid discharged to the high convex portion 31 having the lowest density that gives cushioning to the skin is likely to penetrate downward from the surface, the top surface sheet 11A is rapidly moved in the Ya direction and Liquid leakage is suppressed without being diffused in the Xa direction.

  The ratio (ds / db) of the fiber density db at the apex in the Z direction (reference point for height hb) of the high convex portion 31 to the fiber density ds at the apex in the Z direction (reference point for height hs) of the low convex portion 32. ) Is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3.0 times or less, more preferably 2.5 times from the viewpoint of enhancing the drawability of excreted body fluid. More specifically, it is preferably 1.2 times or more and 3.0 times or less, and more preferably 1.5 times or more and 2.5 times or less.

The ratio of the fiber density of the top sheet 11A can be measured using one of the two methods (1) and (2) described below.
(1) When the basis weight of the topsheet 11A is substantially uniform (uniform) (or when it can be determined that the topsheet 11A is substantially uniform), the height (thickness) of the cut surface of the topsheet 11A is measured.
(2) When the basis weight of the top sheet 11A is non-uniform (or can be determined to be non-uniform), the average distance between fibers on the cut surface of the top sheet 11A is measured.

Here, the determination as to whether the basis weight of the topsheet 11A is substantially uniform is performed as follows.
When 10 or more cut samples having a size of 10 cm in the Xa direction and 10 cm in the Ya direction are taken out from the surface sheet 11A and each basis weight is measured, the triple value (3σ) of the standard deviation σ is within 10% of the average μ. If there is no fiber unevenness on the appearance, it is judged to be substantially uniform. However, it is preferable to make a comprehensive judgment in consideration of various factors such as the composition being different in a minute region.

First, the method (1) will be described.
A sample for measuring the high convex portion 31 by cutting from the top sheet 11A in plan view with a straight line passing through the center of gravity (vertex in the Z direction) of the high convex portion 31 and the two embossed portions 2 (intermediate embossed portion 21) at both ends. Create Similarly, the low convex portion 32 is cut by a straight line passing through the center of gravity (vertex in the Z direction) and the two embossed portions 2 (two intermediate embossed portions 21 or two other embossed portions 22) at both ends. A sample for measuring the convex portion 32 is created. At this time, care should be taken not to cause a decrease in the height of each measurement sample due to cutting.

The cross section of each measurement sample obtained was measured using an electron microscope JCM-5100 manufactured by JEOL Ltd. under the conditions of a sputtering time of 30 seconds (Pt) and an acceleration voltage of 10 KV. At least one of the embossed portions 2 is photographed, or a situation where the embossed portions 2 can be understood by combining a plurality of images is measured, and the height (thickness) of each measurement sample is measured from the photographed images. Note that the image measurement may be performed using either a printed matter or a PC screen.
In the method (1), the height hb (thickness) of the central portion of the sample for measuring the high convex portion 31 is divided by the height hs (thickness) of the central portion of the sample for measuring the low convex portion 32 to obtain the density. The ratio (db / ds) is used.

Next, the method (2) will be described.
The cross section is measured in the same manner as in the method (1). In addition to the measurement performed by the method (1), the cross section of each measurement sample is photographed at an enlargement magnification of 500 to 1000 times. In the region where the number of fibers is 3 to 7 in the width direction (plane direction) at the target measurement site (center portion of each measurement sample) of each of the magnified images, an image analyzer (NEWQBE ver. 4.20 made by NEXT) Is used to find the distance between the nearest centers of gravity of the fibers.
In the above measurement, measurement is performed almost entirely in the height (thickness) direction, and the closest distance between the centers of gravity is not caused to overlap. Moreover, about a cross section, it measures at least 3 places, Preferably 5 places, More preferably, 10 places, The average value is used.
In the method of (2), the distance ratio between the nearest centroids at the center of the sample for measuring the high convex portion 31 is divided by the distance between the nearest centroids at the center of the sample for measuring the low convex portion 32. db / ds).

The material for forming the top sheet 11A will be described.
As the non-heat-shrinkable fiber layer 1u made of non-heat-shrinkable fibers, for example, a web formed by a card method or a bulky nonwoven fabric is preferably used. As the bulky nonwoven fabric, it is possible to give the top sheet 11A a desired density gradient, and from the viewpoint that it is possible to bring a good texture to the top sheet 11A, an air-through nonwoven fabric, an airlaid nonwoven fabric, A resin bond nonwoven fabric is preferably used. The web formed by the card method is a fiber assembly in a state before being made into a nonwoven fabric. That is, a fiber assembly in a state where fibers are extremely loosely entangled in a state where a post-processing applied to a card web used for manufacturing a nonwoven fabric, for example, a heat-sealing process by an air-through method or a calendar method is not performed. It is the body. When a web formed by the card method is used as the non-heat-shrinkable fiber layer 1u, the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are joined simultaneously or after being joined, and then the non-heat-shrinkable fiber layer 1u. Heat-bond the fibers inside.
As the non-heat-shrinkable fiber that is a constituent fiber of the non-heat-shrinkable fiber layer 1u, if it is a fiber that does not substantially have heat-shrinkability or has a higher heat-shrink temperature than the lower layer (heat-shrinkable fiber layer), Usually, those used for absorbent articles such as sanitary napkins and disposable diapers can be used without particular limitation.
The basis weight of the non-heat-shrinkable fiber layer 1u is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, from the viewpoint of forming a sufficient density gradient and improving the feel of the topsheet 11A. , Preferably 50 g / m ² or less, more preferably 40 g / m ² or less, and more specifically preferably 10 g / m ² or more and 50 g / m ² or less, more preferably 15 g / m ² or more and 40 g / m ² or less. More preferably.

As the heat-shrinkable fiber layer 1d containing heat-shrinkable fibers, a web formed by a card method or a non-woven fabric having heat-shrinkability can be used.
As the heat-shrinkable fibers of the constituent fibers of the heat-shrinkable fiber layer 1d, those made of a thermoplastic polymer material and having heat-shrinkability are preferably used. Examples of such fibers include latently crimpable fibers. The latent crimpable fiber can be handled in the same manner as a conventional nonwoven fabric fiber before being heated, and has a property that a helical crimp is developed and contracted by heating at a predetermined temperature. Fiber. The content ratio of the heat-shrinkable fiber in the heat-shrinkable fiber layer 1d is preferably 40% by mass or more and 100% by mass or less.

The latent crimpable fiber, which is a heat-shrinkable fiber, is composed of, for example, an eccentric core-sheath type or side-by-side type composite fiber composed of two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. The heat-shrinkable fiber layer 1d includes, for example, such latently crimpable fibers, and simultaneously or after heat fusion with the non-heat-shrinkable fiber layer 1u, causes the fibers to crimp. Can be shrunk. The basis weight of the heat-shrinkable fiber layer 1d is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 50 g / m ² or less, more preferably 40 g / m ² or less, more specifically Is preferably 10 g / m ² or more and 50 g / m ² or less, and more preferably 15 g / m ² or more and 40 g / m ² or less.

  For example, the top sheet 11A has a non-heat-shrinkable fiber layer 1u containing non-heat-shrinkable fibers as an upper layer, and a heat-shrinkable fiber layer 1d made of heat-shrinkable fibers before shrinking as a lower layer, and is laminated to form a plurality of embossed portions 2 At the same time as or partially bonded together in a predetermined regular pattern by the intermediate embossed portion 21 and the other embossed portion 22, or after both are bonded, heat is applied to heat-shrink the lower heat-shrinkable fiber layer 1 d in the horizontal direction. Is formed. Since the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are intermittently bonded and integrated by the embossed portion 2 (the intermediate embossed portion 21 and the other embossed portion 22), the heat-shrinkable fiber layer 1d is heat-shrinked. As a result, the non-heat-shrinkable fiber layer 1u is entangled and strain is generated in an attempt to shrink. This distortion protrudes in a convex shape toward the non-heat-shrinkable fiber layer 1u, and a plurality of three-dimensional dome-shaped convex portions 3 are formed. The bonding (heat fusion) by the embossed portion 2 is, for example, a plurality of substantially X-shaped and substantially Y-shaped so as to correspond to the arrangement of the X-shaped intermediate embossed portion 21 and the Y-shaped other embossed portion 22. A non-heat-shrinkable fiber layer 1u in a laminate of a non-heat-shrinkable fiber layer 1u and a heat-shrinkable fiber layer 1d is formed on an embossed surface (such as a circumferential surface of an embossing roll) in which embossed pins having a cross section are arranged in a predetermined pattern. The non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are melted at the portion that is pressed from the side and heat-pressed by each embossed spin.

  The heat shrinkage of the heat-shrinkable fiber layer 1d is, for example, that the heat-shrinkable fiber layer 1d is composed of only one or more kinds of heat-shrinkable fibers, or one or more kinds of heat-shrinkable in the heat-shrinkable fiber layer 1d. The fibers are contained, and the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are bonded together or after the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are bonded together, the heat-shrinkable fiber layer 1d Is carried out by heat treatment.

  At the time of heat shrinkage, in the topsheet 11A, the large polygonal region BT surrounded by the six embossed portions 2 (two intermediate embossed portions 21 and four other embossed portions 22) has the widest region. Therefore, it is difficult to be suppressed by the six embossed portions 2, and it is easy to be raised, and the highest high convex portion 31 is obtained. Further, since the small polygonal region ST surrounded by the four embossed portions 2 (two intermediate embossed portions 21 and two other embossed portions 22) is narrow, the heat-shrinkable fiber layer 1d is thermally contracted in the horizontal direction. However, since the bulge is suppressed by the four embossed portions 2, the low convex portion 32 is lower than the high convex portion 31.

The surface sheet 11A formed by laminating the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d by the method described above preferably has a basis weight of 20 g / m ² or more, more preferably 35 g / m ² or more. and, preferably 100 g / m ² or less, more preferably 80 g / m ² or less, more specifically, is preferably 20 g / m ² or more 100 g / m ² or less, 35 g / m ² or more 80 g / m ² More preferably, it is as follows.
The contact area between the topsheet 11A and the wearer's skin is preferably 45% or less, particularly 42% or less, for the above-mentioned reason, and the lower limit is preferably 25% or more, particularly 30% or more.

  Further, as shown in FIG. 7, the top sheet 11 </ b> A is devised in the arrangement of the low convex portions 32 that are lower than the high convex portions 31. Specifically, a large polygon region row BTL formed by arranging a plurality of large polygon regions BT adjacent to each other along a first direction (Ya direction), and a plurality of small polygon regions STL in the first direction. Small polygonal region rows STL arranged adjacent to each other along (Ya direction) are alternately arranged in a second direction (Xa direction) orthogonal to the first direction (Ya direction). . Therefore, even if the low convex part 32 formed in each small polygon area | region STL which comprises each small polygon area | region row | line STL applies mounting | wearing pressure by wear, it is regularly arranged in the large polygon area | region BT. It is protected by the high convex portion 31 formed on the surface and is not easily crushed in the thickness direction. In addition, since the small polygon region row STL includes a plurality of low convex portions 32 and lower regions existing therebetween, a passage for air and steam is ensured and effective for suppressing sag, Liquid diffusion in two directions (Xa direction) is easily suppressed.

  Further, as shown in FIG. 7, the top sheet 11 </ b> A is further devised in the arrangement of the low convex portions 32 that are lower than the high convex portions 31. Specifically, the high convex portion row 31L and the low convex portion row 32L formed along the first direction (Ya direction) corresponding to the lateral direction of the napkin 1 are the second direction (Xa direction) corresponding to the vertical direction. Alternatingly arranged. And the intermediate embossed part 21 is arrange | positioned so that it may be located in the low convex part row | line | column 32L in the intermediate part of the two high convex parts 31 and 31 nearest in the vertical direction (Xa direction). For this reason, there is no high ridge portion between the two high convex portions 31 and 31 closest to each other in the second direction (Xa direction), and the high embossed portions 31 and 31 are low intermediate embossed portions. Therefore, it is suppressed that the excretory liquid is rapidly diffused in the Xa direction through the high convex portion 31 having a low fiber density. Further, the intermediate embossed portion 21 imparts a fiber density gradient to the top sheet 11A to increase the drawability of the liquid, and has an effect of reducing stickiness and stuffiness. On the other hand, the two low convex portions 32, 32 closest to each other in the first direction (Ya direction) are separated from the high convex portion 31 in the vertical direction (Xa direction) and the horizontal direction (Ya direction) due to the presence of the intermediate embossed portion 21. ) In both directions. For this reason, even if the low convex part 32 applies mounting pressure by wearing and the high convex part 31 is crushed in the thickness direction, it is hard to receive the influence. On the other hand, the high convex portion 31 surrounded by the intermediate embossed portion 21 and the low convex portion 32 is resistant to mounting pressure and therefore is not easily crushed. Such a mechanism makes it easy to keep the contact area between the wearer's skin being worn and the topsheet 11A small, and because the air passage by the low convex row 32L is secured, stickiness is less likely to occur. It is easy to be suppressed.

  Moreover, in the topsheet 11A, as shown in FIG. 11, the plurality of low convex portions 32 are arranged in a row via the intermediate embossed portions 21 adjacent to each other in the first direction (Ya direction). Thus, the lower embossed portion 21 having a lower height exists between the low convex portions 32 and 32 located at the closest position, and the low convex portion row 32L is formed, so that the low convex portion row is formed. Since the flow of air and water vapor along 32L can be ensured, it is easy to suppress stuffiness while the napkin 1 is worn. When the intermediate embossed portion 21 is formed of only one, the effect is higher.

  Further, as shown in FIG. 7, the top sheet 11A is formed by disposing the non-heat-shrinkable fiber layer 1u on the skin facing surface side and the heat-shrinkable fiber layer 1d on the non-skin facing surface side. Therefore, toward the heat-shrinkable fiber layer 1d in which the fiber density has increased due to the shrinkage, the excreted body fluid is quickly drawn from the skin facing surface side to the non-skin facing surface side by capillary force, and there is an effect of reducing stuffiness. .

As the core wrap sheet, a water-permeable fiber sheet such as tissue paper or nonwoven fabric is preferably used. The core wrap sheet may wrap the entire absorbent core with one sheet, or may wrap the entire absorbent core with two or more core wrap sheets. For example, the skin of the absorbent core The facing surface side and the non-skin facing surface side may be covered with separate sheets.
When the absorbent body 14 is composed of the absorbent core 40 and the core wrap sheet 14c that wraps the absorbent core, the compression unit 6 described above may be provided only in the absorbent core, The sheet and the absorbent core are preferably provided integrally.

As the surface sheet 11, the side sheet 12, and the non-skin side sheet 13, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the surface sheet 11, a liquid permeable nonwoven fabric or a perforated film can be used. As the side sheet 12, a water-repellent nonwoven fabric having a high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used. As the non-skin-side sheet 13, a water-repellent nonwoven fabric having high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used.
For fixing the top sheet 11, the side sheet 12, the non-skin side sheet 13, and the absorbent body 14, a fusion agent such as an adhesive used for absorbent articles such as sanitary napkins, heat embossing, ultrasonic embossing, and high-frequency embossing is usually used. A landing means is used.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
Moreover, the center area | region 41 may have the protrusion part which protrudes in the skin opposing surface side instead of the protrusion part 5 which protrudes in the non-skin opposing surface side. The absorbent core 40 shown in FIG. 3 has a rectangular region 6N in which the compression unit 6 is not formed at the center in the width direction Y, and the region 6N is rearward from a part of the front portion A. The region 6 </ b> N where the compressing portion 6 is not formed may extend over the entire length in the longitudinal direction X of the absorbent core 40.
In addition, the top sheet 11A has a first direction orthogonal to the second direction (Xa direction) shown in FIGS. 7 and 8 instead of matching the second direction (Xa direction) with the longitudinal direction X of the absorbent article such as a sanitary napkin ( (Ya direction) may coincide with the longitudinal direction X of the absorbent article.

Moreover, the whole area | region of the skin side sheet | seat 10 may consist only of one surface sheet 11 of a liquid permeability. Moreover, the surface sheet 11A which forms the whole or a part of the skin side sheet is replaced with the surface sheet 11A in which the embossed portion 2 is formed in the embodiment shown in FIG. 8, and the embossed portion in the embodiment shown in FIG. 2 may be the top sheets 11B and 11C. Each of the intermediate embossed portions 21 of the topsheet 11B includes a V-shaped bi-directionally extending shape portion 21a, an inverted V-shaped bi-directionally extending shape portion 21a, and a rectangular disposed independently at these intermediate positions. It consists of the shape independent embossed part 21b. Each intermediate embossed portion 21 of the top sheet 11C has a V-shaped bi-directionally extending shape portion 21a, an inverted V-shaped bi-directionally extending shape portion 21a, and a rectangular connection parallel to the Y direction connecting them. It consists of the embossed part 21c. Regarding the topsheets 11B and 11C, the same components as those of the topsheet 11A are denoted by the same reference numerals.
Moreover, each sheet | seat described in Unexamined-Japanese-Patent No. 2011-15707 (patent document 1) can also be used as a surface sheet in this invention.

In the surface sheet according to the present invention, it is preferable that the convex portions 3 are formed in a dotted shape in a plan view of the surface sheet 11 like the surface sheet 11A shown in FIG. However, what is alternately formed in the direction orthogonal to this one direction may be used, for example, what is described in JP, 2011-080178, A (patent documents 2) can also be used as a surface sheet.
Moreover, the surface sheet 11 may have a single layer structure. Moreover, the lower layer fiber layer 1d in the topsheet 11 having a two-layer structure may include a normal thermoplastic fiber other than the heat-shrinkable fiber.

  In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, and disposable diapers. Examples of the body fluid to be absorbed by the absorbent article include menstrual blood, spillage, loose stool, urine, saliva, blood and the like.

1 Sanitary napkin (absorbent article)
10 skin side sheet 11, 11A-11C surface sheet 1u non-heat-shrinkable fiber layer (upper fiber layer)
1d heat shrink fiber layer (lower fiber layer)
2 Embossed part (heat fusion part, joint part)
21 intermediate embossed part 22 other embossed part 3 convex part 31 high convex part 31L high convex part row 32 low convex part 32L low convex part row 33 connecting convex part R liquid passage 12 side sheet 13 non-skin side sheet 14 absorber 14c core Wrap sheet 40 Absorbent core 41 Central region 45 Side region 40A Stacked fiber 15 Absorbent body 17 Wing part 18 Back flap part 6 Compression part (local high density part)

Claims (9)

Absorbency comprising a skin-side sheet forming a skin-facing surface, a non-skin-side sheet forming a non-skin-facing surface, and an absorbent body including an absorbent core, and having a front portion, an excretory portion-facing portion and a rear portion in the longitudinal direction. Goods,
The skin sheet is a top sheet in which the portion overlapping the absorbent core has a plurality of high convex portions and a plurality of low convex portions whose height is lower than the high convex portions as convex portions protruding toward the wearer's skin side. Consists of
The low convex portion has a higher density than the high convex portion, and has a fluid passage that connects the high convex portion and the low convex portion around the high convex portion,
The absorbent core has a shape that is long in the longitudinal direction of the absorbent article, and a pair of side regions located on both sides of the absorbent core and the pair of side regions in the excretory part facing part. It has a central area that is located between them and has a high basis weight compared to each of the lateral areas,
The central region is thicker than the side regions, and is integrally formed with the side regions,
A plurality of local high-density portions are formed in a state dispersed in the longitudinal direction and the width direction of the absorbent core on the skin facing surface side or the non-skin facing surface side of each side region, Is an absorbent article in which the density of the site where the local high density portion is formed is higher than the surrounding area.   The topsheet has a plurality of large polygonal regions surrounded by a plurality of fused portions, and a plurality of small polygonal regions that are smaller in area than the large polygonal regions and surrounded by a plurality of fused portions, The high convex portion is formed at the central portion of the large polygon region, and the low convex portion is formed at the central portion of the small polygon region, and there is one large polygon region and one small polygon region. Alternatively, the plurality of fused portions are adjacent to each other, and the high convex portion and the low convex portion are formed between the high convex portion and the low convex portion formed in the large polygon region and the small polygon region adjacent to each other. The absorptive article according to claim 1 which has a connection convex part which has projected continuously over a low convex part, and the inside of the connection convex part forms the liquid passage.   The large polygonal region is formed in a hexagonal shape surrounded by six fusion parts, and the small polygonal region is formed in a rectangular shape surrounded by four fusion parts, When attention is paid to a square area, a plurality of the small polygon areas are adjacent to each other around the large polygon area, and a plurality of the fluid passages are connected around the high protrusions in the one large polygon area. The absorbent article according to claim 2.   In the surface sheet, a plurality of large polygon regions are arranged adjacent to each other along a first direction, and a plurality of small polygon regions are arranged along the first direction. The absorption according to any one of claims 2 and 3, wherein the small polygon region rows that are arranged adjacent to each other are alternately arranged in a second direction orthogonal to the first direction. Sex goods.   5. The absorbent article according to claim 1, wherein a density of a portion where the local high-density portion is not formed is equal to or higher than a density of the central region.   The said local high-density part is dented toward the said non-skin opposing surface side from the said skin opposing surface side, and is not formed in the said center area | region, The any one of Claims 1-5. Absorbent articles.   The absorptive article according to any one of claims 1 to 6 which has a plurality of low convex parts which overlap with said local high-density part as said low convex part.   The said surface sheet has the upper layer fiber layer and lower layer fiber layer which were mutually laminated | stacked, This upper layer fiber layer and this lower layer fiber layer are mutually joined in the said melt | fusion part. The absorbent article of Claim 1.   The absorbent article according to claim 8, wherein the lower fiber layer has a higher density than the low convex portion.

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