JP2016214407A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article with improved diffusibility of liquid on an absorber.SOLUTION: An absorbent article 10 includes: a liquid permeable surface sheet 14; a liquid impermeable rear surface sheet 12; and an absorber 13 arranged between the surface sheet 14 and the rear surface sheet 12. In the absorber 13, a plurality of recesses 508 are formed on surface on the side of the surface sheet 14. The plurality of recesses 508 form a first pattern 501a extending in a first direction and a second pattern 501b extending in a second direction crossing the first direction. Cross sectional areas vertical to the first direction and the second direction of the recesses 508 positioned in a central area of the absorber 13 are larger than cross sectional areas vertical to the first direction and the second direction of the recesses 508 positioned in peripheral areas of the absorber 13.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an absorbent article.

  In recent years, the demand for absorbent articles such as disposable diapers using a super absorbent polymer (hereinafter referred to as “SAP”) and non-woven fabrics is increasing.

  Absorbent articles such as disposable diapers have been improved in various ways to improve their functions and wearing feeling. In particular, in order to improve the diffusibility and absorbability of liquids such as urine, it has been studied to apply various shapes to the surface of an absorber used for absorbent articles.

  For example, Patent Document 1 discloses an absorbent body having a recessed portion that is recessed in a groove shape, wherein the recessed portion in the crotch portion is arranged in the longitudinal direction of the absorbent body, and the recessed portion in the abdominal side portion and the dorsal side portion are each in the longitudinal direction. An absorber arranged in an oblique direction to the above has been proposed. The absorber described in Patent Document 1 is said to have excellent liquid diffusibility in the ventral and dorsal sides due to the above configuration.

JP 2012-143535 A

  However, in the absorber in which the shape of the recess (such as a cross-sectional area perpendicular to the longitudinal direction) as described in Patent Document 1 is the same at any position of the absorber, a large amount of liquid is discharged from the central region of the absorber. When diffusing to the peripheral region of the absorber through the recess, most of the absorber is absorbed by the absorber around the recess in the central region, and the liquid does not sufficiently diffuse to the peripheral region of the absorber. Here, there is a problem that the peripheral area of the absorber is not used and the entire absorber cannot be effectively used. Here, the central region of the absorber refers to a region that first comes into contact with a liquid such as urination and a region in the vicinity thereof. In addition, the center area | region of an absorber can be changed with the wearer's physique, sex, etc. of an absorbent article.

  This invention is made | formed in view of such a problem, The place made into the objective is to provide the absorbent article which improved the diffusibility of the liquid on an absorber.

  In order to achieve such an object, the absorbent article of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. In the absorbent article, the absorbent body has a plurality of recesses formed on the surface sheet side surface, and the plurality of recesses have a first pattern extending in the first direction, and a first Forming a second pattern extending in a second direction that intersects the direction, and the first pattern and the second pattern are recessed portions that intersect with each other and are located in the central region of the absorber The cross-sectional areas perpendicular to the first direction and the second direction are larger than the cross-sectional areas perpendicular to the first direction and the second direction of the recesses located in the peripheral region of the absorber.

  As described above, according to the present invention, the first cross-sectional area perpendicular to the first direction and the second direction of the concave portion located in the central region of the absorber is the first of the concave portion located in the peripheral region of the absorber. By being larger than the cross-sectional area perpendicular to the direction and the second direction, an absorbent article with improved liquid diffusibility on the absorbent body can be provided.

It is a three-dimensional projection figure which shows the external appearance of the underpants type disposable diaper which applied the absorbent article which concerns on one Embodiment of this invention. It is an expanded view of the underpants type disposable diaper which concerns on one Embodiment of this invention. It is a three-dimensional projection figure which unfolds and shows the disposable diaper concerning one embodiment of the present invention. It is sectional drawing of the disposable diaper which concerns on one Embodiment of this invention. It is a figure which shows the absorber of the disposable diaper which concerns on one Embodiment of this invention. It is a fragmentary sectional view of the absorber of a disposable diaper concerning one embodiment of the present invention. It is an enlarged view which shows the groove part of the absorber which concerns on one Embodiment of this invention. It is a figure which shows the absorber of the disposable diaper which concerns on other embodiment of this invention. It is sectional drawing of the absorber of the disposable diaper which concerns on other embodiment of this invention. It is a figure which shows the absorber of the disposable diaper which concerns on other embodiment of this invention. It is sectional drawing of the absorber of the disposable diaper which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, but includes other absorbent articles belonging to the concept of the present invention.

[Embodiment 1]
First, the whole shape of the underpants type disposable diaper which applied the absorbent article which concerns on Embodiment 1 of this invention is demonstrated using FIGS. 1-4.

  FIG. 1 is a three-dimensional projection view showing an external appearance of a pants-type disposable diaper to which the absorbent article according to the present embodiment is applied as viewed from the front side. FIG. 2 is a development view of the pants-type disposable diaper according to the present embodiment.

  The pants-type disposable diaper 10 according to the present embodiment includes a front body region 10F, a back body region 10R, and a crotch region 10C that connects the front body region 10F and the back body region 10R. Moreover, the waist periphery opening part 10W which surrounds a wearer's waist part with the front body area | region 10F and the back body area | region 10R at the time of wear is formed. Similarly, a pair of left and right leg openings 10L that surround one of the regions from the base of the wearer's legs to the thigh are formed by the lower end of the front body region 10F and the back body region 10R and the crotch region 10C. Yes.

  When the disposable diaper 10 is worn, the front body region 10F is located on the wearer's ventral side, and the back body region 10R is located on the wearer's back side. The crotch region 10 </ b> C covers the wearer's crotch, and the leg of the wearer is passed through the pair of left and right leg openings 10 </ b> L.

  The disposable diaper 10 is provided with a cover sheet 11 so as to cover the front body region 10F and the back body region 10R together with the crotch region 10C, and the right and left side edges of the cover sheet 11 are joined together to form a closing portion 10J. ing. Thus, a waist opening 10W and a pair of left and right leg openings 10L are defined.

  In the disposable diaper 10 according to the present embodiment, an imaginary line P is assumed that extends through the crotch region 10C from the abdominal side to the back side at or near the center of the disposable diaper 10 in the width direction. Specifically, the imaginary line P extends, for example, along the abdominal surface of the disposable diaper 10 and vertically when the waist side when the disposable diaper 10 is worn is up and the crotch side is down. It extends in the vertical direction along the surface of the diaper 10 on the back side via the region 10C.

  As shown in FIG. 2, a pair of notch portions 11 </ b> A each having a semicircular arc shape that is a leg-periphery opening 10 </ b> L in FIG. 1 is formed at the center of the left and right side edges in the longitudinal direction of the cover sheet 11. . On the surface of the cover sheet 11 that comes into contact with the wearer's skin, an absorbent body 13 having an elongated rectangular shape is disposed so as to cover the front body region 10F, the crotch region 10C, and the back body region 10R. The absorber 13 is joined to the back sheet 12. The back sheet 12 bonded to the absorber 13 is a direction in which the longitudinal direction is substantially parallel to the imaginary line P, and the cover sheet 11 is positioned so that the imaginary line P passes through the center in the width direction or the vicinity thereof. Bonded on top. A liquid-permeable top sheet 14 that touches the wearer's skin is joined on the surface of the absorbent body 13. The absorbent body 13 may be wrapped in a core wrap (not shown), and the absorbent body 13 wrapped in the core wrap may be compressed together with the top sheet 14.

  The cover sheet 11 is joined with a rubber thread 15 for forming the leg gathers and a rubber thread 17 for forming the waist gathers in an expanded state.

  In addition, a pair of side sheets 18 forming a three-dimensional gather are provided on the left and right side edges of the top sheet 14. The pair of side sheets 18 is a member that rises along both side edges of the absorbent body 13 when worn and prevents side leakage of urine excreted by the wearer. Each of the side sheets 18 is provided with a thread rubber 19 as a three-dimensional gather elastic material in a form in which the inner edge of the side sheet 18 is folded back to the absorbent body 13 side and is worn when the thread rubber 19 contracts. Stands up toward the person's skin contact direction. The three-dimensional gather can employ a known configuration used in conventional disposable diapers. For example, it can be formed by sandwiching and fixing a stretched three-dimensional gather elastic material between the layers of the water repellent sheet.

  FIG. 3 is a three-dimensional projection view showing an exploded state in which the disposable diaper 10 according to this embodiment is broken and developed. The laminated structure of the disposable diaper 10 is demonstrated using FIG.

  As shown in FIG. 3, the disposable diaper 10 includes a cover sheet 11, a liquid-impermeable back sheet 12, an absorber 13, and a top sheet 14 that are sequentially stacked and joined in order from the outside.

  The cover sheet 11 formed with a pair of notches 11A is formed by an inner cover sheet 11B on the skin side of the wearer and an outer cover sheet 11C joined to the outside of the inner cover sheet 11B. The inner cover sheet 11B is joined to the back sheet 12. The absorber 13 is disposed between the back sheet 12 and the top sheet 14, and the top sheet 14 is joined to the back sheet 12 through the absorber 13. The outer cover sheet 11C is formed of a thin non-woven fabric in order to obtain a good touch, and the rubber thread 15 and 17 are joined in an extended state between the inner cover sheet 11B and the outer cover sheet 11C. In addition, a pair of side sheets 18 forming a three-dimensional gather are provided on the left and right side edges of the top sheet 14. The pair of side sheets 18 is a member that rises along both side edges of the absorbent body 13 when worn and prevents side leakage of urine excreted by the wearer. Each of the side sheets 18 is provided with a rubber thread 19 as a three-dimensional gather elastic material in such a manner that its inner edge is folded and gripped toward the absorber 13 side.

  The back sheet 12, the absorbent body 13, and the top sheet 14 can be bonded to underwear or the like to form an absorbent article that absorbs liquid.

  FIG. 4 is a cross-sectional view of the disposable diaper 10 according to the present embodiment taken along the line IV-IV in FIG. The cross-sectional shape of the absorber 13 of the disposable diaper 10 is demonstrated using FIG.

  On the surface of the top sheet 14, the absorbent body 13 and the top sheet 14 are compressed by intermittent embossing, and a plurality of quadrilateral concave portions are integrally formed. The plurality of recesses are arranged at intervals to form a groove 401 through which a liquid such as urine passes. The groove 401 has a depth from the surface on the top sheet 14 side of the absorber 13 toward the surface on the back sheet 12 side. A portion surrounded by the groove 401 formed on the surface of the absorbent body 13 is referred to as a “deformation suppressing portion 402”. The details of the shape loss suppressing unit 402 will be described later. Note that the ridge line at the top of the groove 401 indicates a contour line 403 of a portion that is not the groove 401 and that is visible when the cross section is cut.

  Next, the absorber 13 of the disposable diaper 10 according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a top view with the surface on the top sheet 14 side of the absorbent body 13 of the disposable diaper 10 according to the present embodiment facing upward. The surface shape of the absorber 13 is demonstrated using FIG.

  The absorber 13 is mainly made of pulp and SAP. The absorber 13 has an elongated rectangular shape so as to cover the front body region 10F, the crotch region 10C, and the back body region 10R. The absorbent body 13 is divided into three parts in the longitudinal direction into a front body part M1, a crotch part M2, and a back body part M3. The crotch portion M2 may be formed with a pair of notches that form an arc shape in accordance with the pair of left and right leg openings 10L that surround the thick crotch portions of the wearer's legs. In the absorbent body 13, the direction from the crotch part M2 to the front body part M1 is the front (upward) direction, the direction from the crotch part M2 to the back body part M3 is the back (downward) direction, and is orthogonal to the front-rear direction (longitudinal direction). The direction is the left-right direction (width direction). Moreover, although the absorber 13 is a rectangle, the shape of the absorber in this invention is not restricted to this. For example, the shape of the absorber has rounded corners at the front and rear (up and down) ends, an elliptical shape extending in the front and rear (up and down), a circular shape, and the length of the front and rear (up and down) left and right are about the same Includes various shapes such as rectangular ones.

  Further, the absorber 13 is formed with grooves 501 extending in an oblique lattice shape. In the present embodiment, the grooves 501 extend discontinuously in an oblique lattice shape from one end to the other end of the groove forming region N1. A groove 501 formed as a result of compression centered on a recess 508 (described later) of the absorbent body 13 is a case where it is continuous even if it is intermittent due to the interval and depth of the recess 508. It may be a mixture of both.

  As shown in FIG. 5, in this embodiment, the groove 501 is formed in the groove forming region N1 by a pattern in which a plurality of concave portions 508 are arranged at a predetermined interval. The groove 501 extends from one upper side to the other lower side (in FIG. 5) in the width direction (left-right direction) of the absorber 13 orthogonal to the direction (longitudinal direction) indicated by the phantom line P that is parallel to the longitudinal direction of the absorber 13. A plurality of first grooves (first patterns) 501a extending in a first direction inclined from the upper right side toward the lower left side toward the paper surface, and one lower side (from the other upper side toward the paper surface in FIG. 5). And a plurality of second grooves (second patterns) 501b extending in a second direction inclined from the upper left to the lower right. The first grooves 501a are arranged in parallel with each other at a predetermined interval. Similarly, the second grooves 501b are arranged in parallel with each other at a predetermined interval. However, the plurality of grooves 501 may not be completely parallel to each other, and the intervals between them may not be constant.

  In FIG. 5, the plurality of first grooves 501a are inclined at the same angle with respect to the virtual line P, and are arranged at a predetermined interval. That is, although each 1st groove | channel 501a is arrange | positioned in parallel and predetermined space | interval, this invention is not restricted to this, The thing where the space | interval of a groove | channel is not constant, and the inclination angle of each groove | channel differ. The same applies to the second groove 501b. In the absorber 13, a plurality of first grooves 501a and a plurality of second grooves 501b are formed, but a first groove and a second groove extending in an oblique direction are formed. If so, the number of grooves is not limited. Although it is preferable that the two intersect, the present invention is not limited to this, and includes those in which the two do not intersect. Details of the operation of the groove will be described later.

  The absorber 13 has a groove forming region N1 in the center region in the width direction, and has groove non-forming regions N2 on both sides thereof. Both side edges in the width direction of the absorber 13 are groove non-formation regions N2, and the groove formation region N1 extends in a band shape from one end to the other end in the direction indicated by the phantom line P in the central region.

  FIG. 6 is a partial cross-sectional view of the disposable diaper 10 according to this embodiment, taken along the line VI-VI in FIG.

  The groove 501 is a member in which a predetermined groove pattern is formed from the surface of the absorbent body 13 on the top sheet 14 side, and is formed by compressing the absorbent body 13 with heat in some cases. The width and depth of each groove 501 may be uniform, or may vary according to the distance between adjacent grooves, the position of the groove, and the like. Moreover, as shown in FIG. 6, the side wall of the groove 501 may be V-shaped obliquely inclined from the absorber surface, or may extend substantially vertically. Note that the ridge line at the top of the concave portion 508 indicates a contour line 601 of a portion that is not the groove 501 and is visible when the cross section is cut.

  By the compression for forming the groove 501, the groove 501 portion of the absorber 13 and possibly the vicinity thereof are compressed as compared with other portions, and the density of the absorber 13 is increased. The compression ratio of the most compressed groove 501 is preferably about 4 to 7 times, but other compression ratio ranges are included depending on the material of the absorber 13 and the liquid to be absorbed. Moreover, the absorber density of the compressed part is more than twice that of the non-compressed part. The absorber density is mainly the density of the pulp.

  As described above, the groove 501 portion of the absorbent body 13 is formed by compressing the absorbent body 13. Therefore, the absorbent body 13 is compressed and harder than the other parts of the absorbent body 13 in the groove 501 and possibly the vicinity thereof.

  Moreover, since the outer periphery of the absorber in the shape change suppressing portion 402 is pressed by the groove 501, the shape change suppressing portion 402 is difficult to be deformed. Therefore, even if a tensile force is generated in an oblique direction with respect to the longitudinal direction, the absorber 13 is obliquely less likely to wrinkle due to the rigidity of the groove 501, and the deformation preventing portion 402 is not easily deformed. The deformation with respect to the direction will be suppressed. Therefore, the absorber 13 is not greatly deformed and deformed by the longitudinal movement of the legs. Since the absorbent body 13 does not move, the fit between the crotch can be maintained, and body fluid leakage hardly occurs. Moreover, since it can also suppress that the absorber 13 cuts by deformation | transformation, absorption performance can be maintained.

  In the present embodiment, the groove forming region N1 extends from the front body portion M1 to the back body portion M3 of the absorber 13, but the present invention is not limited to this. That is, the groove forming region N1 may be formed only in the crotch portion M2. Further, the groove forming region N1 may be formed only in the front body part M1 or only in the back body part M3, or may not be formed in the end portion in the longitudinal direction. Since the portion close to the waist portion is in close contact with the skin by waist gathers, the feeling of wear is improved by preventing the hard portion of the groove 501 from hitting the skin.

  The disposable diaper 10 according to the present embodiment has a configuration in which a top sheet 14 is laminated on the surface of an absorbent body 13, and is compressed from the surface of the top sheet 14 to form a groove 501. That is, the top sheet 14 is fixed in a state of being in close contact with the groove 501. In this way, by compressing the top sheet 14 together, the top sheet 14 is also formed with the deformation preventing portion 402, and it is suppressed that the top sheet 14 is twisted or cut off with respect to movement during walking.

  As shown above, when the sheet laminated on the absorbent body 13 is also compressed to form the groove 501, the top sheet 14 on the absorbent body 13 is absorbed in the groove 501 portion by this compression. It bites into the side 13 and is integrated with the absorber 13. By fixing the strong absorbent body 13 and the various sheets as described above, the swaying and biasing of the absorbent body 13 can be suppressed even when the legs move back and forth.

  FIG. 7 is an enlarged view showing a part of the groove 501 on the upper surface of the absorber 13 according to the present embodiment (the groove 501 of the absorber 13 surrounded by the broken line ellipse VII in FIG. 5).

  The groove 501 can be configured by arranging a plurality of recesses 508 with an interval L1. The concave portion 508 has, for example, a quadrilateral shape, and is formed by compressing the absorber 13 with an embossed shape of the same shape. The interval L1 is about 2 mm. The length L2 in the arrangement direction of the recesses 508 is about 2.4 mm. L1 and L2 are preferably in a range of 1 mm ≦ L1 ≦ 5 mm and 1 mm ≦ L2 ≦ 50 mm, respectively. Moreover, the widest width L3 of the recessed part 508 is about 3-5 mm, the width L4 narrower than the width L3 is about 2-4 mm, and the narrowest width L5 is about 1-3 mm. In addition, the recessed part 508 is shown typically and the number and magnitude | size follow this range.

  The recesses 508 are arranged with a gap L1 between them, but the gap 701 between the adjacent recesses 508 is recessed more than the mold collapse suppression unit 402 surrounded by the groove 501. In other words, the absorbent body 13 in the gap 701 is pulled along with the compression when forming the recess 508, and the recess 508 is recessed as compared with the deformation prevention portion 402. Accordingly, although there is a difference in height between the recess 508 and the gap 701, the groove 501 is lower than the non-compressed portion and lower than the shape-loss suppressing portion 402 as a whole.

  In such a groove 501 constituted by intermittent embossing, the compression rate is preferably about 4 to 7 times in the concave portion 508, but is not limited to this range. Other ranges are included depending on the material and the liquid to be absorbed.

  Thus, the groove 501 can be configured by intermittent embossing. As a result, it is possible to suppress the kinking and deformation of the absorber due to the longitudinal movement of the legs. In addition, when the embossing of the groove 501 is intermittent, the groove 501 itself is also easily bent and fits to the body more easily, and can follow the movement of the body, thereby suppressing a sense of stiffness.

  Next, how to absorb urine when supplementing urine with the disposable diaper 10 according to the present embodiment will be described with reference to FIGS.

  In a conventional disposable diaper, for example, when a large amount of urine comes out in the central region of the absorber, most of the urine is absorbed in the central region. The remaining urine that has not been absorbed in the central region diffuses up, down, left and right through the grooves in the central region of the absorber. At this time, when the width of the recess 508 in the direction perpendicular to the arrangement direction of the recesses 508 in the central region of the absorber is narrow or the depth is shallow, most of the urine overflows from the groove, and the absorber 13 Most of the urine will be absorbed in the central area. Then, since urine does not diffuse into the peripheral region of the absorber, the absorber in the peripheral region cannot be used, and the urine absorption rate of the entire absorber is lowered. Under such circumstances, the conventional disposable diaper is used for absorbing urine only about 30% of the surface of the absorbent body, and has a problem that the utilization efficiency is low and the cost is high.

  Then, in the disposable diaper 10 which concerns on this embodiment, in order to eliminate said problem, urine is absorbed as follows. That is, first, when a large amount of urine appears in the central region of the absorber 13, a part of the urine is absorbed in the central region of the absorber 13. At the same time as urine is absorbed in the central region of the absorber 13, urine diffuses up and down and left and right through the diagonal grid grooves 501 in the central region of the absorber 13. At this time, since the width perpendicular to the extending direction of the grooves 501 is wider than the size of the lattice formed by the intersecting grooves 501, a sufficient amount of urine flows in the grooves 501. As a result, urine can be quickly diffused to the peripheral region of the absorber 13, and the amount of absorption in the central region of the absorber can be balanced with the amount of absorption in the peripheral region. Specifically, in the present embodiment, the width of the recesses 508 forming the diagonal lattice 502 in the central region of the absorber 13 is wider than the width of the recesses 508 forming the diagonal lattice 504 adjacent to the diagonal lattice 502. The width of the concave portion 508 forming the 504 is wider than the width of the concave portion 508 forming the diagonal lattice 506 adjacent to the diagonal lattice 504. Thus, the cross-sectional area in the direction perpendicular to the arrangement direction of the recesses 508 in the central region of the absorber 13 is larger than the cross-sectional area in the direction perpendicular to the arrangement direction of the recesses 508 in the peripheral region, A larger amount of urine can be diffused to the peripheral region of the absorber 13.

  Here, the central region of the absorbent body 13 of the present invention refers to a region that first comes into contact with a liquid such as urine and the vicinity thereof. In addition, the center area | region of the absorber 13 can be changed with the wearer's physique, sex, etc. of an absorbent article. In the present embodiment, the central region of the absorbent body 13 represents the crotch portion M2 located in the crotch region 10C when worn in the longitudinal direction of the absorbent body 13, and is parallel to the longitudinal direction in the width direction of the absorbent body 13. Although the groove forming region N1 sandwiching the virtual line P that is the center line is represented, the present invention is not limited to this region.

  Thereby, the diffusibility of the urine of the disposable diaper 10 can be improved, and the absorption efficiency of the urine and the utilization factor of the absorber can be increased as the absorber 13 as a whole. Theoretically, nearly 10% of the surface of the absorber 13 can be used. Furthermore, when the groove 501 has an oblique lattice shape, the followability of the wearer can be improved, and the comfort and the touch can be improved.

[Embodiment 2]
FIG. 8 is a top view with the surface on the top sheet 14 side of the absorbent body 13 of the disposable diaper 10 according to Embodiment 2 of the present invention facing upward. The difference between the shape of the absorbent body 13 of this embodiment and the shape of the absorbent body 13 of the first embodiment is that the depth of the recess 808 formed on the surface of the absorbent body 13 is different from the central region of the absorbent body 13 to the peripheral region. It is a point that changes step by step.

  As shown in FIG. 8, the concave portion passes through the point A on the left side when viewed from the upper surface of the groove 801 formed in the central region of the surface of the absorber 13 as viewed from the upper surface of the absorber 13 and reaches the point B on the right side as viewed from the upper surface. In the groove 801 in which 808 are intermittently arranged, the depth of the concave portion 808 forming the oblique lattice 802 (between the points EC and CF) in the center region is the deepest, and the oblique lattice 804 adjacent to the oblique lattice 802. The depths of the recesses 808 that form (between the points DE and FG) are relatively shallow, and the recesses 808 that form the diagonal grids 806 (between the points AD and GB) adjacent to the diagonal grids 804. The depth of is the shallowest. As in the first embodiment, the grooves 801 include a plurality of first grooves (first patterns) 801a in the first direction and a plurality of second grooves (second patterns) 801b in the second direction. Consists of.

  FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8 of the absorbent body 13 of the disposable diaper 10 according to the present embodiment. As shown in FIG. 9, the concave portion 808 passes through a point A on the left side when viewed from the upper surface of the groove 801 formed in the central region of the absorber 13 as viewed from the upper surface of the absorber 13 and reaches a point B on the right side as viewed from the upper surface. In the grooves 801 in which are intermittently arranged, the depth of the concave portion 808 between the points EC and CF is the deepest, and the depth of the concave portion 808 between the points DE and FG is relatively shallow, The depth of the recess 808 between the points AD and GB is the shallowest. Further, the ridge line at the top of the concave portion 808 indicates a contour line 901 of a portion that is not the groove 801 and is visible when the cross section is cut.

  As in the present embodiment, the depth of the concave portion 808 in the central region of the absorber 13 is increased, and the depth of the concave portion 808 is gradually reduced from the central region of the absorber 13 toward both ends. Thus, as in the first embodiment, more urine can be diffused to the peripheral region in the central region. Thereby, the diffusibility of the urine of the disposable diaper 10 can be improved, and the absorption efficiency of the urine can be increased as the absorbent body 13 as a whole.

  The shape of the groove is not limited to the shape of the present embodiment, and the groove is formed in a continuous line in the extending direction, or the width of the cross section perpendicular to the extending direction is increased in the central region, and the end It can also be formed narrow on the part side. Further, the groove may be formed with a continuous line for a part thereof, and the remainder may be formed intermittently, or the cross-sectional area perpendicular to the extending direction of the groove may be changed by a combination of changes in the width and depth thereof. It may be allowed. Thereby, the diffusibility of an absorber can be improved and absorption efficiency can be improved as the whole absorber.

[Embodiment 3]
FIG. 10 is a top view with the surface on the top sheet 14 side of the absorbent body 13 of the disposable diaper 10 according to Embodiment 3 of the present invention facing upward. The difference between the shape of the absorbent body 13 of the present embodiment and the shape of the absorbent body 13 of the first and second embodiments is that the width in the direction perpendicular to the extending direction of the groove 1001 formed on the surface of the absorbent body 13 is It is a point that is continuously narrowed from the central region toward the peripheral region, and a depth of the groove 1001 is continuously changing from the central region to the peripheral region.

  As shown in FIG. 10, in the groove 1001 continuously connected from the point A on the left side as viewed from the upper surface of the absorber 13 to the point B on the right side as viewed from the upper surface through the point C in the central region. The width of the groove 1001 at the point C is the largest, the width of the groove 1001 gradually decreases from there, and the width of the grooves 1001 at the points A and B at both ends of the absorber 13 is the narrowest. Similar to the first and second embodiments, the groove 1001 includes a plurality of first grooves (first patterns) 1001a in the first direction and a plurality of second grooves (second patterns) in the second direction. 1001b. Furthermore, in this embodiment, one groove 1001 is formed from one recess 1002. Moreover, in this embodiment, the width | variety of the groove | channel of the point C is 3-5 mm, and the width | variety of the groove | channel of the points A and B is 0.5-1 mm.

  As in the present embodiment, by increasing the width of the groove 1001 in the central region of the absorber 13 and narrowing the width of the groove 1001 at both ends serving as the peripheral region, more urine is transferred from the central region to both ends. Can be diffused and absorbed there. Thereby, the absorption efficiency of a urine and the utilization factor of an absorber can be raised as the absorber 13 whole. The shape of the groove 1001 is not limited to the shape of the present embodiment, and the central region can be formed as a continuous line and the peripheral region can be formed intermittently.

  FIG. 11 is a cross-sectional view of the absorbent body 13 of the disposable diaper 10 according to this embodiment, taken along the line XI-XI in FIG. In FIG. 11, the depth of the recess 1002 forming the groove 1001 formed on the surface of the absorber 13 continuously changes from the central region of the absorber 13 toward the end. Further, the ridge line at the top of the concave portion 1002 indicates a contour line 1101 of a portion that is not a groove 1001 and is visible when cut in a cross section.

  As shown in FIG. 11, continuous from the point A on the left side when viewed from the top surface of the absorber 13 to the point B on the right side when viewed from the top surface through the point C of the recess 1002 formed in the central region. In the groove 1001, the depth of the concave portion 1002 at the point C in the central region is the deepest, and then the depth of the concave portion 1002 gradually decreases, and the depth of the concave portions 1002 at the points A and B at both ends of the absorber 13. Is the shallowest. In this embodiment, the depth of the concave portion 1002 at point C is 2.4 to 3.6 mm, and the depth of the concave portion 1002 at points A and B is 0.4 to 1.6 mm.

  As in this embodiment, the depth of the concave portion 1002 forming the groove 1001 in the central region of the absorber 13 is increased, and the depth of the concave portion 1002 is gradually increased from the central region toward the both end portions as the peripheral region. By shallowing, as in the first and second embodiments, more urine can be diffused from the central region to both ends and absorbed there. Thereby, the absorption efficiency of a urine and the utilization factor of an absorber can be raised as the absorber 13 whole. Further, in this embodiment, the width and depth of the recess 1002 in the direction orthogonal to the extending direction of the groove 1001 are changed, but only one of them may be changed. Furthermore, the change in the width and / or depth of the recess 1002 may be gradual, or a combination of gradual and continuous changes.

  The absorbent body of the present invention may be wrapped with a core wrap (hydrophilic sheet) and compressed together with the core wrap to form a recess. Moreover, you may compress an absorber, a core wrap, and a top sheet together from the surface of a top sheet, and may form a recessed part.

  Moreover, the shape of the recess is not limited to a quadrilateral shape, and various shapes may be used. For example, a circle, an ellipse, a square, a triangle, etc. In any of these shapes, it is sufficient that the groove can be formed on the surface of the absorber. In the above embodiment, the numerical values such as the width and depth of each recess are measured with reference to the vicinity of the center where the width and depth of each recess are near the maximum value. Thus, in principle, values such as the width and depth of each recess are measured based on the vicinity of the center of each recess, but in the case where the shape of each recess is complicated, Other portions of the recess may be used as a measurement standard for numerical values such as width and depth.

  The structure of the disposable diaper of the present invention is not limited to the pants type as described above, but any configuration as long as the diaper includes the configuration of the absorbent article defined in the claims. Also good. For example, the present invention can be applied to a well-known unfolded disposable diaper or a urine leak pad.

  In addition, the present invention is applicable not only to diapers for infants but also to various absorbent articles and absorbent bodies such as adult diapers and urine leak pads.

DESCRIPTION OF SYMBOLS 10 Disposable diaper 10F Front body area | region 10R Rear body area | region 10C Crotch area | region 10W Waist circumference opening part 10L Leg circumference opening part 10J Closure part 11 Cover sheet 11A Notch part 11B Inner cover sheet 11C Outer cover sheet 12 Back sheet (back surface sheet)
13 Absorbent body 14 Top sheet (surface sheet)
15, 17, 19 Thread rubber 18 Side sheet 401, 501, 801, 1001 Groove 402 Deformation suppressing part 403, 601, 901, 1101 Contour lines 501a, 801a, 1001a First groove 501b, 801b, 1001b Second groove 502, 504, 506, 802, 804, 806 Diagonal lattice 508, 808, 1002 Recess 701 Gap

Claims (11)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
In the absorbent body, a plurality of recesses are formed on the surface sheet side surface,
The plurality of recesses form a first pattern extending in a first direction and a second pattern extending in a second direction intersecting the first direction;
The cross-sectional areas perpendicular to the first direction and the second direction of the concave portion located in the central region of the absorber are the first direction and the second direction of the concave portion located in the peripheral region of the absorber. An absorbent article characterized by being larger than a cross-sectional area perpendicular to the direction. A plurality of the first patterns are formed in parallel with the first direction, a plurality of the second patterns are formed in parallel with the second direction,
The absorbent article according to claim 1, wherein the plurality of formed first patterns and second patterns are in a lattice shape.   The absorbent article according to claim 1, wherein the plurality of recesses are formed from a surface of the topsheet.   The absorbent article according to any one of claims 1 to 3, wherein the plurality of recesses are intermittently formed in the first direction and the second direction.   The absorbent article according to any one of claims 1 to 3, wherein the plurality of recesses are continuously formed in the first direction and the second direction.   The width of the cross section perpendicular to the first direction and the second direction of the recess located in the central region of the absorber is the first direction and the second of the recess located in the peripheral region of the absorber. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is wider than a width of a cross section perpendicular to the direction.   The width of the cross section perpendicular to the first direction and the second direction of the concave portion is gradually reduced from a central region of the absorber toward a peripheral region of the absorber. 6. The absorbent article according to 6.   The width of a cross section perpendicular to the first direction and the second direction of the concave portion is continuously narrowed from a central region of the absorber toward a peripheral region of the absorber. 6. The absorbent article according to 6.   The depth of the said recessed part located in the center area | region of the said absorber is deeper than the depth of the said recessed part located in the peripheral area | region of the said absorber, The Claim 1 characterized by the above-mentioned. Absorbent article.   The absorbent article according to claim 9, wherein the depth of the concave portion becomes gradually smaller as it goes from the central region to the peripheral region of the absorber.   The absorbent article according to claim 9, wherein the depth of the concave portion becomes continuously shallower from the central region to the peripheral region of the absorber.

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