JP2013009946A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article dissolving discomfort caused by wet of a wearer by quickly absorbing and diffusing an excretion liquid.SOLUTION: In this absorbent article 1, an absorber 4 includes an absorbent core 40 including an absorbent material. The absorbent core 40 has high basis weight parts 41 having a relatively large amount of the absorbent material and low basis weight parts 42 having a relatively small amount of the absorbent material, and the high basis weight parts 41 and the low basis weight parts 42 are alternately formed both in the long direction X and in the width direction Y of the absorbent article 1. The absorbent article 1 is formed with a groove 7 where a front face sheet 2 and the absorbent core 40 are integrally recessed. The groove 7 is formed extendedly to at least two high basis weight parts 41, 41 arranged side by side in the long direction X or the width direction Y and one low basis weight part 42 sandwiched by the two high basis weight parts 41, 41. A bottom wall part 71 sectioning the groove 7 is positioned on a skin non-abutment face 4b side rather than the center Tc in the thickness direction of the absorbent core 40.

Description

  The present invention relates to absorbent articles such as sanitary napkins, disposable diapers, and incontinence pads.

  2. Description of the Related Art Absorbent articles such as sanitary napkins are known that have an absorbent body including a top sheet, a back sheet, and a liquid-retaining absorbent core interposed between both sheets, and are substantially vertically long. Further, in the absorbent article having such a configuration, the surface sheet and the absorbent body are integrally formed on the skin contact surface side for the purpose of damming the excretory fluid such as menstrual blood and preventing it from leaking outside. It is known to form a leak-proof groove that is recessed into the groove. For example, Patent Document 1 discloses an absorbent article in which a part (center portion) of an absorbent body has a middle-high portion whose thickness is increased on the skin contact surface side, and a leak-proof groove is formed around the middle-high portion. Have been described.

  Patent Document 2 describes that as an absorbent body in an absorbent article, one in which a plurality of absorbing portions are spaced apart and fixed to one side of a base sheet made of a stretchable sheet or the like is described. In the absorbent body described in Patent Literature 2, an absorbent material is disposed at a lower basis weight than the absorbent portion between adjacent absorbent portions. According to the absorbent article described in Patent Document 2, by having the absorbent body having such a configuration, the absorbent article is deformed according to the complex undulating skin surface, and is deformed according to the movement of the wearer's body. In addition, it is said that high liquid absorption retention can be realized regardless of the presence or absence of deformation. Further, Patent Document 3 uses an absorbent body in an absorbent article in which a large number of individual absorbent parts are arranged over the plane direction, and the absorbent part is interposed between the top sheet and the back sheet. It is described that it is fixed to a sheet. In the absorbers described in Patent Documents 2 and 3, the liquid absorbing portion (absorbent core) is partitioned into a plurality of regions (absorbing portions), and the plurality of absorbing portions are adhesives. They are common in that they are joined and fixed to the sheet by joining means such as the above.

Japanese Patent No. 4167406 JP 2010-273810 A International Publication No. 2009/081744

  As described in Patent Document 1, when a leak-proof groove is formed in a normal absorbent body in which the absorbent core is not partitioned into a plurality of regions, the excrement liquid is blocked by the leak-proof groove. While the effect of improving the leakage is achieved, i) the excretory fluid is likely to stay locally, and the discomfort of the wearer due to wetting cannot be resolved, ii) the high-density leak-proof groove is the absorber Since the absorbent body is partially cured by being continuously formed, there is a possibility that inconveniences such as difficulty in fitting to the wearer's body and lowering of fitting property may occur.

  Since the absorbent body described in Patent Documents 2 and 3 has a configuration in which the absorbent core is partitioned into a plurality of regions (absorbing portions), the above-described i) and ii) compared to a normal absorbent body, In particular, although it is difficult to cause the inconvenience of ii), since the plurality of absorbing portions are bonded and fixed to the sheet by bonding means such as an adhesive, for example, the absorbing portion and the sheet are integrally formed from the same material. Compared to the case, the transferability of the excretory fluid between the two is inferior, and there is room for improvement in terms of the diffusion / absorption action of the excretory fluid by cooperation with the leakage prevention groove. Therefore, the absorbent article which employ | adopted the combination of the absorber of patent document 2 and 3 and a leak-proof groove has room for improvement in the wetting prevention effect (side-leakage prevention effect) of the excretion liquid by a leak-proof groove especially. Yes, especially when there is a large amount of excretion at one time, the excretion liquid moves on the skin contact surface and reaches the leakage prevention groove, and further moves beyond the leakage prevention groove to the outside of the absorbent article, There is a risk of side leakage.

  As a method for preventing such side leakage due to the movement of excretory fluid beyond the leakage prevention groove, a method of arranging an absorbent body outside the absorbent article rather than the leakage prevention groove is conceivable. For example, in the case where a leak-proof groove extending in the longitudinal direction of the absorbent article is formed, the absorbent disposed in the width direction of the absorbent article with respect to the leak-proof groove is absorbed from the leak-proof groove. The article is extended outward in the width direction. However, since this method requires an absorber having a certain size (width) having such an extended portion, it is difficult to reduce the size (width) of the absorber, which is a recent need. It is difficult to make the absorbent article compact, and the degree of freedom in product design is poor. There has not yet been provided an absorptive article that is excellent in the effect of diffusing and absorbing excretory fluid through the cooperation between the absorbent body and the leak-proof groove, eliminates discomfort caused by the wearer's wetting, and is excellent in fit.

  Therefore, the present invention relates to an absorbent article capable of quickly absorbing and diffusing excretory fluid and eliminating discomfort caused by the wearer's wetting.

  The present invention is a vertically long absorbent article comprising a top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between both sheets. The absorbent body includes an absorbent core including an absorbent material, and the absorbent core includes a high basis weight portion in which the absorbent material is relatively large and a relatively small amount of the absorbent material. A low basis weight part, the high basis weight part and the low basis weight part are alternately formed in the longitudinal direction and the width direction of the absorbent article, the absorbent article, A groove is formed by integrally recessing the topsheet and the absorbent core, and the groove has at least two high basis weight portions and two pieces arranged in the longitudinal direction or the width direction. The bottom wall portion that is formed continuously with the one low basis weight portion sandwiched between the high basis weight portions, and that defines the groove, Serial than the thickness direction center of the absorbent core is to provide an absorbent article which is located at the non-skin contact surface side.

  According to the absorbent article of the present invention, the excretory fluid can be absorbed and diffused quickly, and discomfort caused by the wetness of the wearer can be eliminated.

FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as an embodiment of the absorbent article of the present invention from the skin contact surface side. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 3 (a) is a plan view showing the absorbent core used in the sanitary napkin in FIG. 1 from the skin contact surface side, and FIG. 3 (b) is a part of FIG. 3 (a). It is a top view which expands and shows (the part enclosed with the circle). FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG. FIG. 5 is a cross-sectional view schematically showing a cross section taken along line III-III in FIG. FIG. 6 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. FIG. 7 is a schematic cross-sectional view of an embodiment of a method for manufacturing the absorbent body (absorbent core) shown in FIG. 3 and a manufacturing apparatus used therefor. FIG. 8 is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG. FIG. 9 is a schematic cross-sectional view showing a state where an absorbent material is deposited in the concave portion of the rotating drum shown in FIG. FIG. 10 is an explanatory diagram of the compression process of the deposit. FIG. 11 is an explanatory diagram of a method for evaluating air permeability by the Gurley tester method.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. As shown in FIGS. 1 and 2, the napkin 1 of the present embodiment includes a top sheet 2 disposed on the skin contact surface side, a back sheet 3 disposed on the non-skin contact surface side, and both sheets 2. It has an absorber 4 interposed between the three, and is vertically long (long shape in one direction). As shown in FIG. 1, the napkin 1 is disposed on the abdomen side of the wearer with respect to the excretion part facing part 11 disposed opposite to the excretion part (vaginal opening) of the wearer at the time of wearing. The front portion 12 and the rear portion 13 disposed on the back side of the wearer rather than the excretory portion facing portion 11 at the time of wearing are provided in the longitudinal direction X. The excretory part opposing part 11 is a part which has a pair of wing parts 6 and 6 on either side mentioned later. The pair of wing portions 6 and 6 are portions that are wound around the crotch portion (crotch portion) of the underwear when the napkin 1 is fixed to the underwear such as shorts. In addition, when the absorbent article (sanitary napkin) of the present invention does not have a wing part, the excretion part facing part of the sanitary napkin is a so-called short-time napkin whose total length in the product longitudinal direction is 25 cm or less. Is a central portion (second region from the front) when the napkin is divided into three equal parts in the longitudinal direction to form a front portion, a central portion, and a rear portion, and the total length in the product longitudinal direction exceeds 25 cm. In the case of night and night napkins, this is the second area from the front (the third area from the back) when these napkins are equally divided into four in the longitudinal direction.

  In the present specification, the skin contact surface is a surface of the absorbent article or a component thereof that faces the wearer's skin when the absorbent article is mounted, and the non-skin contact surface is the absorbent article. Alternatively, the surface of the member is directed to the side opposite to the skin side (clothing side) when the absorbent article is mounted. Moreover, a longitudinal direction is a direction along the long side of an absorbent article or its structural member, and a width direction is a direction orthogonal to this longitudinal direction. In the figure, the direction indicated by the symbol X is the longitudinal direction of the absorbent article (absorber, absorbent core), and the direction indicated by the symbol Y is the width direction of the absorbent article (absorber, absorbent core). .

  As shown in FIG. 2, the top sheet 2 covers the entire skin contact surface 4 a of the absorbent body 4, and further extends outward in the width direction Y from the left and right side edges along the longitudinal direction X of the absorbent body 4. In addition, the back sheet 3 covers the entire area of the non-skin contact surface 4 b of the absorbent body 4, and further extends outward in the width direction Y from both side edges of the absorbent body 4. The top sheet 2 and the back sheet 3 also extend outward in the longitudinal direction X from the front end and the rear end in the longitudinal direction X of the absorbent body 4, respectively. They are joined together by a known joining means such as an ultrasonic seal.

  As shown in FIGS. 1 and 2, a pair of side sheets 5, 5 are disposed on the left and right side portions along the longitudinal direction X of the napkin 1 over the entire length of the napkin 1 in the longitudinal direction X. The side sheet 5 has an inner side portion in the width direction Y joined to the skin contact surface 2a of the surface sheet 2 by a known joining means, and an outer side portion of the absorber 4 It extends outward in the width direction Y from the side edge along the longitudinal direction X, and the extension part is joined to the extension part from the side edge of the absorber 4 in the back sheet 3 by a known joining means. Yes. The back sheet 3 and the side sheet 5 have a maximum length of outward extension in the width direction Y from the side edge of the absorber 4 in the excretory part facing part 11, and the maximum extension part A pair of wing portions 6 and 6 are formed.

  The non-skin contact surface of the napkin 1 (the non-skin contact surface 3b of the back sheet 3) is directed to the clothing side, such as the crotch portion of the shorts when worn. The non-skin contact surface 3b is provided with an adhesive portion (not shown) for fixing the napkin 1 to a crotch portion of underwear such as shorts. Moreover, the adhesive part (not shown) for fixing to the outer surface (non-skin contact surface) of shorts is attached to the non-skin contact surface (non-skin contact surface 3b of the back surface sheet 3) of a pair of wing parts 6 and 6. Z). These adhesive portions are provided by applying a hot melt adhesive to a predetermined location, and are covered with a release sheet (not shown) made of a film, a nonwoven fabric, paper, or the like before the napkin 1 is used.

  The absorber 4 includes an absorbent core 40 including an absorbent material (fiber material such as pulp, water-absorbing polymer, etc.). The absorbent body 4 in the present embodiment is configured by covering the absorbent core 40 with a core wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric. The absorptive core 40 may be comprised only from fiber materials, such as a pulp, or may be comprised including this fiber material and a water absorptive polymer, and, in the latter case, a water absorptivity between fiber materials. The polymer may be uniformly mixed, or includes a fiber layer mainly composed of a fiber material and a polymer layer mainly composed of a water-absorbing polymer, and the polymer layer is sandwiched between two upper and lower fiber layers. The form may be acceptable. Between the top sheet 2 and the absorbent body 4 and between the absorbent body 4 and the back sheet 3 are bonded to each other by a pattern-coated adhesive (hot melt adhesive or the like) such as dots, spirals and stripes. Also good.

  As shown in FIGS. 2 and 3, the absorbent core 40 includes a high basis weight portion 41 having a relatively large amount of absorbent material and a low basis weight portion 42 (42X, 42Y) having a relatively small amount of absorbent material. The high basis weight portions 41 and the low basis weight portions 42 are alternately formed in the longitudinal direction X and the width direction Y, respectively. More specifically, the absorbent core 40 has a linear low basis weight portion 42X extending along the longitudinal direction X and a linear low basis weight portion extending along the width direction Y, as shown in FIG. 42Y and a plurality of low basis weight portions 42 are formed in a lattice shape as a whole, and a portion partitioned by these linear low basis weight portions 42X and 42Y is a high basis weight portion 41. . Each of the plurality of linear low basis weight portions 42X is formed so as to extend over the entire length in the longitudinal direction X of the absorbent core 40, and each of the plurality of linear low basis weight portions 42Y is absorbent. The core 40 is formed to extend over the entire length in the width direction Y. Each of the plurality of high basis weight portions 41 has a rectangular shape in plan view as shown in FIG.

  Moreover, in this embodiment, as shown in FIG. 2, the high basic weight part 41 is thick compared with the low basic weight part 42 (42X, 42Y), Therefore, the absorptive core 40 is a high basic weight part. 41 has a concavo-convex structure raised as compared with the low basis weight portion 42. When the absorbent core 40 has a concavo-convex structure, the absorbent core 40 absorbs when the napkin 1 is worn, as compared with the case where the skin contact surface and the non-skin contact surface are both substantially flat. The deformation of the absorbent core 40 (absorbent body 4), specifically, the deformation of the absorbent core 40 into a shape that protrudes toward the skin of the napkin wearer is easily induced. Due to the ease of deformation of the absorbent core 40, the excretory part facing portion 11 is easily deformed into a shape that is pressed against the skin of the napkin wearer when the napkin 1 is worn, so that the fit is improved and the wearable A comfortable wearing feeling is given to the person, and leakage of menstrual blood is effectively suppressed.

  In the cross-sectional view of the absorbent core 40 as shown in FIG. 2, the low basis weight portions 42 (42 </ b> X, 42 </ b> Y) are unevenly distributed in the thickness direction of the absorbent core 40. More specifically, in this embodiment, the low basic weight part 42 is unevenly distributed in the skin contact surface 4a side in the thickness direction T of the absorptive core 40, as shown in FIG. And since the low basic weight part 42 is unevenly distributed to the skin contact surface 4a side in the thickness direction T in this way, the high basic weight part 41 is the opposite side to the skin contact surface 4a, ie, the thickness direction. In T, it protrudes to the non-skin contact surface 4b side. Therefore, in the absorbent core 40, the skin contact surface 4a (the surface facing the surface sheet 2) is substantially flat with no irregularities except for the formation portion of the groove 7 described later, The skin contact surface 4b (opposite surface to the back sheet 3) has a high basis weight portion 41 (convex portion) formed so as to protrude and a low basis weight portion 42 (non-convex portion) located between the high basis weight portions 41, 41. Or it has an unevenness due to the recess). Thus, when the low basic weight part 42 is unevenly distributed in the skin contact surface 4a side in the absorptive core 40, as shown in FIG. 2, the non-skin contact surface on the opposite side to the skin contact surface 4a side is shown. Since the space portion (non-convex portion or concave portion) due to the absence of the low basis weight portion 42 is formed on the 4b side, the absorbent core 40 is based on the low basis weight portion 42 on the skin contact surface 4a side. It is easy to deform | transform into the shape which protrudes toward a napkin wearer's skin as an effect, Therefore, the improvement effect of a fitting property and the effect of a menstrual blood leak prevention are show | played.

  In the present invention, the uneven distribution position of the low basis weight portion 42 (42X, 42Y) in the thickness direction T of the absorbent core 40 is not limited to the skin contact surface 4a side as shown in FIG. Conversely, it may be on the non-skin contact surface 4b side. That is, in a cross-sectional view of the absorbent core 40, the low basis weight portion 42 may be unevenly distributed on the non-skin contact surface 4 b side in the thickness direction T of the absorbent core 40. In that case, the high basis weight portion 41 protrudes on the side opposite to the non-skin contact surface 4b side, that is, on the skin contact surface 4a side in the thickness direction T, and as shown in FIG. Is upside down. Therefore, in the absorbent core 40 in which the low basis weight portion 42 is unevenly distributed on the non-skin contact surface 4b side, the non-skin contact surface 4b (opposite surface to the back sheet 3) is substantially flat. On the other hand, the skin contact surface 4a (the surface facing the top sheet 2) has a high basis weight portion 41 (convex portion) formed so as to protrude and a low basis weight portion located between the high basis weight portions 41, 41. 42 (non-convex portion or concave portion), and a space portion (non-convex portion or concave portion) due to the absence of the low basis weight portion 42 is formed on the skin contact surface 4a side. Since the space portion on the skin contact surface 4a side is formed so as to be sandwiched between two adjacent high basis weight portions 41, 41, the shape of the space portion is easily maintained even when the napkin is mounted. The air existing between the skin of the napkin wearer and the napkin 1 is ventilated by the space, and the stuffiness felt by the napkin wearer is reduced.

  In the present invention, in the cross-sectional view of the absorbent core 40, the low basis weight portion 42 (42X, 42Y) includes the skin contact surface 4a and the non-skin contact surface 4b in the thickness direction T of the absorbent core 40. It may be unevenly distributed in the approximate center. In that case, the high basis weight part 41 protrudes in the thickness direction T to the skin contact surface 4a side and the non-skin contact surface 4b side. Therefore, in the absorptive core 40 in which the low basis weight portion 42 is unevenly distributed in the substantially central portion between the skin contact surface 4a and the non-skin contact surface 4b, the skin contact surface 4a and the non-skin contact surface 4b respectively. However, the skin contact surface has irregularities due to the protruding high basis weight portion 41 (convex portion) and the low basis weight portion 42 (non-convex portion or concave portion) located between the high basis weight portions 41, 41. Space portions (non-convex portions or concave portions) due to the absence of the low basis weight portions 42 are formed on the 4a side and the non-skin contact surface 4b side, respectively. The absorbent core 40 having such a configuration is directed toward the skin of the napkin wearer with the low basis weight portion 42 positioned at a substantially central portion in the thickness direction T (substantially central portion of the apparent thickness of the absorbent core 40) as a basic axis. It is easy to be deformed into a shape that rises, and the space portion also has an effect of ventilating air existing between the skin of the napkin wearer and the napkin 1.

  Thus, in this invention, the uneven distribution position of the low basic weight part 42 (42X, 42Y) in the thickness direction T of the absorptive core 40 is the effect produced by it (the deformation | transformation induction effect of the absorptive core 40). , Ventilation effect), depending on which one specifically desires, the skin contact surface 4a side, or the non-skin contact surface 4b side, or the skin contact surface 4a and the non-skin contact surface 4b as shown in FIG. It is possible to select appropriately from the substantially central part.

  The absorbent core 40 (the concavo-convex structure) according to the present embodiment has an external appearance on one surface side of the absorbent material formed into a thin plate shape, and a plurality of absorbent parts having a rectangular shape in a plan view made of the absorbent material. It may appear to be similar to the absorbent body described in Patent Documents 2 and 3 (absorbent body in which a plurality of absorbent parts are fixed to a sheet) in that it is configured to be spaced apart. However, as will be described later, the absorbent core 40 according to the present embodiment is manufactured by molding an absorbent material so as to have the uneven structure, and includes a high basis weight portion 41 and a low basis weight portion. 42 is integrated without using a bonding means such as an adhesive or heat-sealing, and is formed so as not to have a boundary (boundary between the high basis weight portion 41 and the low basis weight portion 42) by the same material. On the other hand, the absorbers described in Patent Documents 2 and 3 are manufactured by fixing a plurality of the absorbing parts to the sheet separate from the absorbing parts, and the absorbing parts And the sheet are joined to each other through a joining means and have a boundary between the absorbing portion and the sheet, and the two are different in this respect. And by the difference of such a structure, while the high basic weight part 41 and the low basic weight part 42 which concern on this embodiment have the continuity in which a liquid can move smoothly, patent document 2 And the absorbent portion and the sheet in the absorbent body according to 3, since there is an interface composed of joining means between them (boundary), liquid diffusion easily occurs at the boundary portion, and the liquid can move smoothly. It is hard to say that it has continuity.

  As shown in FIGS. 1 to 3, the napkin 1 is formed with a groove 7 in which the topsheet 2 and the absorbent core 40 are integrally recessed. The groove 7 is a space (a portion where the material for forming the napkin 1 does not exist) defined by a bottom wall portion 71 and a side wall portion 72 described later. As shown in FIG. 3A, the groove 7 includes a pair of vertical grooves 7X and 7X that continuously extend in the longitudinal direction X and two horizontal grooves 7Y1 and 7Y2 that extend continuously in the width direction Y. These four grooves are connected at their respective end portions to form an annular groove as a whole. The pair of longitudinal grooves 7X and 7X extend over the entire length in the longitudinal direction X of the excretory part-facing part 11 at the left and right side parts along the longitudinal direction X of the absorbent core 40, and further, the front part 12 and the rear part 13 also extends to each. The lateral groove 7Y1 is formed in the front part 12, and the lateral groove 7Y2 is formed in the rear part 13. Both lateral grooves 7Y1 and 7Y2 are formed so as to include a horizontally long shape that is convexly curved outward in the longitudinal direction X in plan view, and the convex top portions of both lateral grooves 7Y1 and 7Y2 have a width of Located in the center of the direction Y.

  The groove 7 (7X, 7Y1, 7Y2) can be formed in accordance with a conventional method by embossing such as embossing with or without heat, or ultrasonic embossing. That is, in the manufacturing process of the napkin 1, after supplying the topsheet 2 on one surface of the absorber 4 (absorbent core 40 having an uneven structure), a predetermined portion is moved from the topsheet 2 side to the absorber 4 side by embossing. The groove 7 can be formed in the predetermined portion by pressing (squeezing) in a concave shape. In the groove 7, the top sheet 2 and the absorber 4 are integrated by heat fusion or the like. The groove 7 has a large number of deep depressions (relatively deep depressions, high embossing parts) and shallow depressions (relatively shallow depressions) such as rectangles, squares, rhombuses, circles, and crosses in plan view. Part, low embossed part) may be alternately connected to form a continuous line as a whole, or a plurality of hollow parts may be intermittently arranged. “Intermittently” means that the interval between adjacent recesses is 5 mm or more.

  The groove 7 includes at least two high basis weight parts (convex parts) 41, 41 arranged in the longitudinal direction X or the width direction Y and one low basis weight part 41, 41. It is formed continuously with a basis weight part (non-convex part or concave part) 42. That is, the groove 7 is formed so as to straddle the unevenness of the absorbent core 40. In the present embodiment, as shown in FIG. 3 (a), with respect to the longitudinal direction X, in the excretory part facing part 11 that is a part that directly receives excretion fluid, a pair of longitudinal grooves 7X, Each of 7X is formed continuously with two high basis weight portions 41, 41 adjacent to each other in the longitudinal direction X and one low basis weight portion 42Y positioned therebetween, and absorbs continuously with the longitudinal direction X. It is formed so as to straddle the irregularities of the core 40. Regarding the width direction Y, in the front portion 12, the lateral groove 7Y1 which is a part of the groove 7 is adjacent to the two high basis weight portions 41, 41 in the width direction Y and one piece between them. It is formed continuously with the low basis weight portion 42 </ b> X, and in the rear portion 13, the lateral groove 7 </ b> Y <b> 2 that is a part of the groove 7 is similarly formed continuously.

  Such a positional relationship between the groove 7 and the high basis weight portion 41 and the low basis weight portion 42 is important in order to more surely exhibit the absorption / diffusion action of excretory fluid according to the present invention described later, In particular, as described above, the fact that the groove 7 (vertical groove 7X) is formed so as to straddle the unevenness of the absorbent core 40 that is continuous in the longitudinal direction X is due to the movement of the excretory fluid in the width direction Y to the outside. This is important because it is related to the effect of preventing the leakage (so-called side leakage). Therefore, in the present embodiment, as a device for ensuring that the arrangement over the unevenness of the groove 7 is obtained more reliably, in the longitudinal direction X of the napkin 1, the low basis weight portion 42 is as described above. The groove 7 is formed so as to include a linear portion 42X extending in the longitudinal direction X in plan view, and the groove 7 includes a portion 7X having a curved portion and extending in the longitudinal direction X in plan view. Forming. That is, in the present embodiment, the pair of longitudinal grooves 7X and 7X, which are a part of the groove 7, are respectively in the longitudinal direction of the napkin 1 in the excretory part facing part 11 as shown in FIG. Each of both side portions along X includes a vertically long shape that is convexly curved outward in the width direction Y of the napkin 1. In this way, the low basis weight portion 42X of the absorbent core 40 is formed in a straight line that completely coincides with the longitudinal direction X of the absorbent core 40, while the longitudinal groove 7X is completely different from the longitudinal direction X. By forming it so as to have a curved portion that does not match (partially matches), at least the curved portion of the longitudinal groove 7X is completely the same as the linear low basis weight portion 42X extending in the longitudinal direction X in plan view. Are not coincident with each other, and the longitudinal groove 7X is easily formed so as to straddle the unevenness of the absorbent core 40 continuous in the longitudinal direction X.

  In the present embodiment, from the same viewpoint as described above, the low basis weight portion 42 is formed so as to include the linear portion 42Y extending in the width direction Y in plan view as described above, and the groove 7 is formed so as to include portions 7Y1 and 7Y2 having a curved portion in a plan view and extending in the width direction Y. That is, in this embodiment, the lateral grooves 7Y1 and 7Y2 which are part of the groove 7 are respectively formed in the napkin 1 at the front part 12 or the rear part 13 of the napkin 1 as shown in FIG. Of the horizontal grooves 7Y1 and 7Y2 so that at least the respective curved portions of the lateral grooves 7Y1 and 7Y2 are linear low-tsubo extending in the width direction Y in plan view. The lateral grooves 7Y1 and 7Y2 do not completely coincide with the amount portion 42Y, and the lateral grooves 7Y1 and 7Y2 are easily formed so as to straddle the unevenness of the absorbent core 40 that is continuous in the width direction Y.

  4 to 6 schematically show the cross section of the groove 7 in each part of the absorbent core 40. As shown in FIGS. 4 to 6, the groove 7 (7 </ b> X, 7 </ b> Y <b> 1, 7 </ b> Y <b> 2) is defined by a bottom wall portion 71 and a side wall portion 72 erected from the bottom wall portion 71. As shown in FIGS. 5 and 6, the bottom wall portion 71 that defines the groove 7 is less than the center Tc in the thickness direction of the absorbent core 40 in both the high basis weight portion 41 and the low basis weight portion 42. It is located on the skin contact surface 4b side. When the absorbent core 40 has a concavo-convex structure as in this embodiment, the thickness direction center Tc is the center of the apparent thickness of the absorbent core 40 having the concavo-convex structure. It is located in the middle between the skin contact surface 4a and the portion that protrudes most toward the non-skin contact surface 4b. When the absorbent core 40 does not have an uneven structure, the thickness direction center Tc is the center of the substantial thickness of the absorbent core 40, and the skin contact surface 4 a and the non-skin contact in the absorbent core 40. Located in the middle of the contact surface 4b.

  In this way, when the bottom wall portion 71 that defines the groove 7 is designed to be positioned on the non-skin contact surface 4b side with respect to the thickness direction center Tc, the skin contact of the absorbent core 40 when the groove 7 is formed. In pressing from the surface 4a side, 1) In the high basis weight part 41, the part which becomes the bottom wall part 71 and the part which becomes the side wall part 72 which define the groove 7 after the pressing are respectively compressed, so that the groove 7 2) In the low basis weight portion 72, the low basis weight portion 72 is deformed in accordance with the shape of the groove 7 from the skin contact surface 4a side by the pressing, so that the low basis weight portion 72 is partially Stretched. And the groove | channel 7 obtained after the said pressing, ie, the groove | channel 7 in which the bottom wall part 71 is located in the non-skin contact surface 4b side rather than the thickness direction center Tc, is the groove | channel 7 in the high basic weight part 41. Since the shape of the liquid is stable, the attraction of liquid by capillary force is enhanced, and in the low basis weight portion 72, the groove 7 is extended and the thickness is reduced, so that the liquid is diffused. As a result, the amount of liquid is easily moved to the high basis weight portion 41 in the groove 7 (mainly the side wall portion 72). From the viewpoint of more surely exhibiting such an effect, the bottom wall 71 defining the groove 7 is 0.1 mm or more, particularly 0.2 mm or more from the thickness direction center Tc to the non-skin contact surface 4b side. It is preferable to exist in a distant position.

  Positioning the bottom wall 71 defining the groove 7 closer to the non-skin contact surface 4b than the thickness direction center Tc of the absorbent core 40 is by adjusting the pressing force or the like when forming the groove 7. Basically, it is possible, but it becomes more reliable by devising the configuration of the absorbent core 40. As described above, the groove 7 is formed by squeezing the absorbent core 40 together with the top sheet 2. In particular, the relatively thin portion such as the low basis weight portion 42 is formed by the groove 7 as described above. By forming so that the unevenness | corrugation of the absorptive core 40 may be straddled, compared with the high basic weight part 41, the degree of pressing is suppressed low and there exists a tendency for a bulk to recover to some extent after pressing. Moreover, in the high basic weight part 41, at the time of formation of the groove | channel 7, the shape of the groove | channel 7 is formed by pressing over the part used as the side wall part 72 from the part used as the bottom wall part 71 which defines the groove | channel 7 after pressing. In the low basis weight portion 42, the portion to be squeezed by the formation of the groove 7 is the bottom wall portion 71 and its periphery, and is squeezed as compared with the high basis weight portion 41. Since there are few parts to squeeze, the volume of the part squeezed after squeezing is easy to recover. Therefore, immediately after squeezing, even if the bottom wall portion 71 that defines the groove 7 formed by squeezing is located on the non-skin contact surface 4b side with respect to the thickness direction center Tc, the bottom wall is recovered due to the recovery of bulk over time. The portion 71 moves to the skin contact surface 4a side, and finally, in the low basis weight portion 42, the bottom wall portion 71 may be positioned on the skin contact surface 4a side with respect to the thickness direction center Tc. This is prevented, and the bottom wall portion 71 that defines the groove 7 is reliably positioned on the non-skin contact surface 4b side with respect to the thickness direction center Tc not only in the high basis weight portion 41 but also in the low basis weight portion 42. For this purpose, the distance L1 (see FIG. 3) that the groove 7 crosses the low basis weight portion 42, that is, the width L1 of the linear low basis weight portion 42 (42X, 42Y) should not be set too long. Is effective. By reducing the width L1 of the low basis weight part 42 to some extent, the bulk recovery of the low basis weight part 42 after pressing for the formation of the groove 7 is suppressed, and the bottom wall part 71 that defines the groove 7 is thickened. It becomes more reliable to position it on the non-skin contact surface 4b side than the direction center Tc. From such a viewpoint, the width L1 of the low basis weight portion 42 is preferably 1 to 5 mm, and more preferably 1 to 3 mm. The low basis weight portions 42X and 42Y may have the same or different width L1.

  Incidentally, as described above, in the case where the groove 7 is formed by alternately connecting the deep depressions and the shallow depressions, the deep depression of the grooves 7 is formed only in the low basis weight 41. When the absorbent core 40 is squeezed, the volume of the squeezed portion is difficult to recover after squeezing, and thus the above-described effects are hardly obtained. Therefore, in order to reliably obtain the above-described effect, there is a method in which the length in the longitudinal direction X of the napkin 1 of the deep depression is longer than the width L1 of the linear low basis weight portion 42 (42X, 42Y). It is valid. Other than such a method, the formation direction of the groove 7 (direction in which the linear groove 7 extends) is inclined with respect to the formation direction of the low basis weight part (direction in which the linear low basis weight part extends) (both formations). A method of setting a predetermined angle between directions) is effective.

  In the present embodiment, the high basis weight portion 41, the low basis weight portion 42, the groove 7, and the vicinity thereof, the high basis weight portion 41 has a higher density than the low basis weight portion 42, and the groove 7 is further formed. There is a density gradient. That is, the density of the parts indicated by reference signs A to E in FIGS. 3B and 4 to 6 is A ≦ B << C << E, more preferably A << B << C <D <E. The density decreases as the distance from the groove 7 (vertical groove 7X) decreases (site A), and the density increases as the distance from the groove 7 increases (area B and / or C). In the groove 7 (bottom wall portion 71), The density is maximized (sites D and E). Moreover, about the groove | channel 7 (bottom wall part 71), the site | part D in the low basic weight part 42 (42Y) is along the groove | channel 7 because the density is made a little low compared with the site | part E in the high basic weight part 41. It is more preferable that the density of the liquid is higher than that of the part C in the vicinity of the groove 7 in the high basis weight portion 41. The density gradient that the density increases as it approaches the groove 7 is mainly caused by the formation of the groove 7 by the embossing process described above (squeezing of the absorbent core 40), and the absorber in which the conventional leak-proof groove is formed. Also exists. In this embodiment, the density gradient is characterized in that the part C has a higher density (B << C) than the part B, and the vicinity of the groove 7 is the density of the high basis weight portion 41 and the low basis weight portion 42. Is different. The term “near the groove” means the side wall 72 (see FIGS. 4 to 6) that defines the groove 7 and the vicinity thereof, and mainly the length of the groove 7 from the groove 7 (the outer surface of the side wall 72). It means a portion within 5 mm outside the direction perpendicular to the vertical direction (width direction of the groove 7).

  As described above, the portions B and C in the vicinity of the groove 7 (vertical groove 7X) have the same distance from the groove 7, but the portion C located in the high basis weight portion 41 has a lower basis weight. The reason why the density is higher than the portion B located in the amount portion 42 (42Y) is that the high basis weight portion 41 is more absorbent than the low basis weight portion 42 before the groove 7 is formed by pressing the absorbent core 40. This is because there are many materials and the density is high. That is, as will be described later, the absorbent core 40 according to the present embodiment deposits an absorbent material so as to have a high basis weight portion 41 and a low basis weight portion 42 to obtain a deposit having an uneven structure, When the entire deposit is produced by compressing the entire deposit with a uniform compressive force using a pressure roll or the like, in such a compression process, the high basis weight portion 41 as the convex portion is more non-convex or as the concave portion. Since it is compressed more strongly than the low basis weight portion 42, the high basis weight portion 41 (site C) has a higher density than the low basis weight portion 42 (site B). Thus, there is a difference in density between the site B and the site C before the formation of the groove 7, and when the groove 7 is formed in the site B and the site C by pressing, the side wall portion 72 that defines the groove 7. And this density difference is reflected in the vicinity thereof, and as a result, B << C with respect to the density.

  The napkin 1 of the present embodiment has a concavo-convex structure formed of a high basis weight part (convex part) 41 and a low basis weight part (non-convex part or concave part) 42 as an absorbent core in which the grooves 7 are formed. By adopting the absorbent core 40, it is possible to solve the problem ii) of the conventional absorbent article employing a combination of a flat absorbent core having no irregularities and a leak-proof groove, and the absorbent body 4 ( Despite the formation of the high-density grooves 7 in the absorbent core 40), the absorber 4 is hardly cured and has excellent fit. As shown in FIG. 3, when the low basis weight portion 42 is formed on the outer side of the napkin 1 (outer part of the groove 7) than the groove 7, the leakage prevention effect by the groove 7 is further increased, and the napkin A soft touch can be given to the peripheral edge part of 1 (especially both side edge parts along the longitudinal direction X of the napkin 1). Moreover, as shown in FIG. 3, when the site | part in which the high basic weight part 41 was enclosed by the low basic weight part 42 is distribute | arranged to the substantially whole absorbent core 40, at the time of mounting | wearing the napkin 1, it is with respect to a wearer. The hit becomes soft and can provide a flexible feel.

  Further, in the napkin 1 of the present embodiment, the groove 7 is mainly connected to two high basis weight portions 41 and 41 adjacent to each other in a predetermined direction and one low basis weight portion 42 positioned therebetween. By being formed so as to straddle the irregularities of the absorbent core 40, excretion fluid such as menstrual blood can be quickly absorbed and diffused regardless of the amount thereof, The above-mentioned problem i) of an absorbent article employing a combination of a conventional flat absorbent core having no irregularities and a leak-proof groove can be solved, and has excellent leak-proof properties (side-leakage prevention properties), and an absorbent body. Therefore, the size of the absorbent article can be reduced, and the absorbent article can be made compact.

  Explaining the absorption / diffusion action of the excretory fluid in the napkin 1 of the present embodiment with reference to FIG. 3B, the excretory fluid W such as menstrual blood excreted by the wearer of the napkin 1 is usually opposed to the excretory part. It is received at the center in the width direction Y of the portion 11 and moves in the width direction Y from the skin contact surface (skin contact surface 2a of the topsheet 2) toward the groove 7 (vertical groove 7X), for example, FIG. In (b), from the part A (near the center part of the width direction Y of the excretion part opposing part 11) toward the part B (near the groove 7 in the low basic weight part 42), the various structural members (surface sheet) of the napkin 1 2, move along the absorbent core 40 and the like. As described above, since there is a density difference between the part B and the part C and the density is B << C, the excretory liquid W that has reached the part B is a groove in the high basis weight portion 41 due to capillary force. 7 easily moves to a part C that is in the vicinity of 7 and hardly stays in the part B. Thus, the excretion liquid W moves in the front-rear direction of the napkin 1 along the groove 7 in the vicinity of the groove 7 and in the width direction Y of the groove 7, and quickly from the excretion part facing part 11 in the longitudinal direction X. To spread.

  Since the part B exists not as a simple gap (space) located between the adjacent high basis weight parts 41, 41 but as a part of the absorbent core 40 (low basis weight part 42), the excretion fluid is retained. It has a function. Therefore, the amount of the excretory fluid W is large, and the moving speed of the excretory fluid W from the site A to the site B is higher than the moving speed of the excreted fluid W from the site B to the site C (diffusion rate in the longitudinal direction X). Even in the case of high speed, the excretion fluid can be temporarily held in the part B, and therefore, the part D (the groove 7 in the low basis weight portion 42 is defined outside the part B in the width direction Y of the napkin 1). A large amount of excretory liquid is prevented from moving to the bottom wall portion 71) at the same time. As a result, the excretory liquid W moves over the groove 7 to the outside in the width direction Y of the napkin 1 and leaks laterally. It is prevented that it leads to. In addition, the fact that the part B itself has a relatively high density due to the squeezing at the time of forming the groove 7 also suppresses the movement of the liquid from the part B to the part D and thus contributes to the prevention of side leakage. ing.

  The excretory liquid W is quickly absorbed and held by the high basis weight portion 41 while moving from the portion B to the portion C in the vicinity of the groove 7 and inward in the width direction Y from the groove 7. As shown in FIG. 6, the part exceeding the absorption capacity of the part E is located in the part E (the bottom wall part 71 defining the groove 7 in the high basis weight part 41) located outside the part C in the width direction Y. Moving. The part E is the part most compressed when the groove 7 is formed, and the density thereof is overwhelmingly higher than the part C adjacent to the width direction Y, so that the excretion fluid W moves from the part E to the part C. Therefore, it is difficult for the excretion liquid W to move outward in the width direction Y of the napkin 1 over the groove 7. This is the same as the relationship between the part B and the part D in the low basis weight part 42 described above. The excretion fluid W that has moved to the site E via the site C passes through the groove 7 without leaking to the outside of the groove 7, and is adjacent to the site D (the bottom wall that defines the groove 7 in the low basis weight portion 42. Part 71) and further to another part E adjacent thereto. Thus, the excretory fluid W that moves in the groove 7 is absorbed and held mainly by the high basis weight portion 41 during the movement.

  Thus, in the napkin 1 of this embodiment, the excretion liquid excreted in the central part in the width direction Y of the excretory part facing part 11 is closer to the longitudinal groove 7X and the longitudinal groove 7X than the longitudinal groove 7X. In both of the portions located inward in the width direction Y, the napkin 1 is quickly diffused in the front-rear direction, and is absorbed and held mainly by the high basis weight portion 41 in the middle of such diffusion. Therefore, the napkin 1 of the present embodiment can quickly diffuse and absorb the excreted excretory liquid by the diffusion and absorption action of the excreted liquid by the cooperation of the absorbent body 4 (absorbent core 40) and the groove 7, It is difficult to cause side leakage and can eliminate discomfort caused by the wetness of the wearer. From the viewpoint of ensuring the operational effects of such a napkin 1, it is preferable to set the dimensions and the like of the respective parts as follows.

The ratio (S41 / S42) of the basis weight S41 of the high basis weight portion 41 of the absorbent core 40 and the basis weight S42 of the low basis weight portion 42 is preferably 1.25 to 10, more preferably 3 to 6. .
The basis weight S41 of the high basis weight portion 41 is preferably 100 to 600 g / m ² , more preferably 150 to 500 g / m ² , and the basis weight S 42 of the low basis weight portion 42 is preferably 10 to 150 g / m 2. ² and more preferably 30 to 100 g / m ² .
The ratio (T41 / T42) between the thickness T41 of the high basis weight portion 41 and the thickness T42 of the low basis weight portion 42 is preferably 1 to 20, and more preferably 1.5 to 10.
The thickness T41 of the high basis weight portion 41 is preferably 0.5 to 10 mm, more preferably 1 to 8 mm, and the thickness T42 of the low basis weight portion 42 is preferably 0.1 to 5 mm, more preferably 0. 2 to 3.0 mm.

The size of the high basis weight portion 41 in a plan view as shown in FIG. 3A varies depending on the type and use of the absorbent article, but in a sanitary napkin such as the napkin 1, the length L2 in the longitudinal direction X (See FIG. 3A) is preferably 5 to 50 mm, more preferably 10 to 30 mm, and the length L3 in the width direction Y (see FIG. 3A) is preferably 3 to 30 mm, and more preferably Is 5-20 mm.
It is preferable that 5 to 70, particularly 10 to 60, high basis weight portions 41 are formed per 50 cm ² area.

The width L5 (see FIG. 3B) of the groove 7 (7X, 7Y1, 7Y2) is preferably 0.5 to 5.0 mm, more preferably 1.0 to 4.0 mm.
The depth L6 of the groove 7 (see FIG. 5) is preferably 0.5 mm or more, more preferably 1.0 mm or more.

  In addition, although the dimension of each part of the groove | channel 7 mentioned above may be measured using a ruler etc. with naked eyes, Preferably, it measures using a digital microscope. For example, the groove 7 can be enlarged and photographed using a digital microscope VHX-1000 manufactured by KEYENCE, and the dimensions of each part can be measured. The width L5 of the groove 7 is measured at the bottom surface of the groove 7. The depth L6 of the groove 7 is obtained by measuring the cross section of the groove 7 with a digital microscope.

  When the formation material of each part in the napkin 1 is demonstrated, the various things conventionally used in the said technical field can be especially used as the surface sheet 2 and the back surface sheet 3 without a restriction | limiting. As the surface sheet 2, for example, a liquid-permeable sheet such as a nonwoven fabric or an apertured film can be used. As the back sheet 3, for example, a resin film that does not have moisture permeability, a resin film that has micropores and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, a laminate of these and other sheets, and the like are used. Can do. Moreover, as the side sheet | seat 5, the various things conventionally used in the said technical field can be especially used without a restriction | limiting, For example, the sheet | seat made from a water-repellent nonwoven fabric and a resin film can be used.

  As an absorptive material which is a forming material of the absorptive core 40, various materials conventionally used in the technical field can be used without particular limitation. For example, natural materials such as wood pulp, cotton, hemp and the like can be used as fiber materials. Fibers: synthetic fibers made of synthetic resins such as polyethylene and polypropylene; semi-synthetic fibers such as acetate and rayon can be used. Further, in addition to these fiber materials, water-absorbing polymers of various shapes such as particles can be used as the absorbent material.

  Below, the manufacturing method of the absorber 4 (absorbent core 40) which concerns on this invention is demonstrated taking the example of the manufacturing method of the absorber 4 (absorbent core 40) mentioned above. FIG. 7 shows an embodiment of a method for manufacturing the absorbent body 4 and a manufacturing apparatus used therefor. The absorber manufacturing apparatus includes a rotating drum 50 that is rotationally driven in the direction of arrow R1, a duct 60 that supplies an absorbent material 45 that is a raw material of the absorbent core 40 to the outer peripheral surface of the rotating drum 50, and a rotating drum 50 A transfer roll 70 disposed obliquely below and rotated in the direction of arrow R2, a vacuum box 65 disposed between the duct 60 and the transfer roll 70 in the circumferential direction of the rotary drum 50, a vacuum box 65, and the rotary drum 50 and a mesh belt 75, which is a sheet-like air-permeable member, disposed so as to pass between the transfer roll 70 and the rotary drum 50, and a vacuum conveyor 80 disposed below the transfer roll 70. I have.

  As shown in FIG. 7, the rotating drum 50 has a cylindrical shape, and receives power from a motor such as a motor, and a member forming the outer peripheral surface thereof rotates about a horizontal axis. A space 56 capable of depressurizing the inside is formed in a non-rotating portion on the inner side (rotating shaft side) of the rotating drum 50. A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device. On the other hand, piping (not shown) capable of taking in air outside the apparatus is connected to the spaces 57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.

  As shown in FIG. 8, a concave portion 51 having a shape corresponding to the shape of the absorbent core 40 to be manufactured is formed on the outer peripheral surface of the rotary drum 50. A large number of pores are formed in the bottom surface portion 52 of the recess 51, and the pores of the bottom surface portion 52 of the recess 51 absorb while the recess 51 passes over the space 56 maintained at a negative pressure. It functions as a suction hole for the conductive material 45. On the other hand, the left and right side portions of the outer peripheral surface of the rotating drum 50 where the concave portion 51 is not formed are made of a frame body of the rotating drum 50 made of a metal rigid body and are non-breathable.

  As shown in FIG. 8, a plurality of partition members 53 that partition the recess 51 into a plurality of regions are formed on the bottom surface 52 of the recess 51. Each partition member 53 is made of a non-breathable plate member. The inside of the recess 51 is partitioned by a plurality of partition members 53 into a plurality of regions 54 corresponding to the plurality of high basis weight portions 41 in the absorbent core 40 described above. The shape of each partition region 54 in plan view is the same shape (rectangular shape) as that of the high basis weight portion 51 in plan view. Further, as will be described later, in order for the absorbent material to be deposited in the recess 51 beyond the height of the partition member 53 protruding from the bottom surface 52, the height of the partition member 53 protruding from the bottom surface 52. Is shorter than the depth of the recess 51.

  As shown in FIG. 7, one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and the other end side (not shown) has a fiber material introduction device. have. The fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp into defibrated pulp and feeds the defibrated pulp (fiber material) into a duct. A water-absorbing polymer introduction part that introduces the water-absorbing polymer may be provided in the middle of the duct 60.

  The transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and the outer peripheral portion rotates around a horizontal axis when receiving power from a prime mover such as a motor. In the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70, a space 71 that can be depressurized is formed. A known exhaust device (not shown) such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.

  The vacuum box 65 is disposed between the downstream end 61 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50. The vacuum box 65 has a box-like shape having upper and lower surfaces, left and right side surfaces, and a back surface, and has an opening that opens toward the rotary drum 50 at a portion facing the back surface. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 61, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .

  The mesh belt 75 is a sheet-like air-permeable member, which is formed by connecting a belt-like air-permeable belt having a mesh in an endless manner, and is guided by a plurality of free rolls and transfer rolls 70 so as to continue a predetermined path. Move on. The mesh belt 75 is driven by the rotation of the transfer roll 70. As shown in FIG. 7, the mesh belt 75 is introduced on the outer peripheral surface of the rotating drum 50 in the vicinity of the downstream end portion 61 of the duct 60, and then between the vacuum box 65 and the rotating drum 50 and the transfer roll. 70 and the rotating drum 50 are arranged so as to pass sequentially. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.

  The vacuum conveyor 80 includes an endless breathable belt 83 that is stretched between the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.

  Next, a method for continuously manufacturing the absorbent body 4 (absorbent core 40) using the above-described absorbent body manufacturing apparatus will be described. In order to manufacture the absorber 4 using the above-described absorber manufacturing apparatus, the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. . By making negative pressure in the space 56, an air flow is generated in the duct 60 to convey the absorbent material 45 to the outer peripheral surface of the rotary drum 50. Further, the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated. Then, when the fiber material introduction device is operated to supply the fiber material into the duct 60 and further supply the water-absorbing polymer, these absorbent materials 45 ride on the air flow flowing through the duct 60 and scatter. The state is supplied toward the outer peripheral surface of the rotating drum 50.

  While the portion covered with the duct 60 is being conveyed, the absorbent material (mixture of fiber material and water-absorbing polymer) 45 is sucked into the recess 51 of the rotary drum 50. The absorbent material 45 is gradually deposited on the bottom surface portion 52 of each partition region 54 of the recess 51, and finally, the protruding height from the bottom surface portion 52 of the partition member 53 is set as shown in FIG. It accumulates in the recessed part 51 beyond. In the deposit 46 obtained in this way, the part (partition member corresponding part) 46a formed by depositing the absorbent material 45 on the partition member 53 has a relatively small amount of deposited absorbent material 45, and other parts. (Partition region corresponding part) 46b has a relatively large amount of deposited absorbent material 45, and the entire deposit 46 has an uneven structure.

  Then, when the rotary drum 50 rotates and the concave portion 51 comes to the position opposite to the vacuum box 65, the deposit 46 in the concave portion 51 is sucked to the mesh belt 75 by suction from the vacuum box 65. . In this state, the deposit 46 in the concave portion 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side near the closest portion to the mesh belt 75. In this state, the mold is released from the concave portion 51 and moved onto the transfer roll 70.

  Thus, the deposit 46 that has moved onto the transfer roll 70 together with the mesh belt 75 is conveyed to the transfer section (the lowermost end of the transfer roll 70) with the vacuum conveyor 80 while being adsorbed by the mesh belt 75 on the transfer roll 70. Then, in the transfer section, the vacuum box 84 moves to the vacuum conveyor 80 by suction.

  In the absorbent body manufacturing apparatus of the present embodiment, as shown in FIG. 7, the first core wrap sheet 47 made of tissue paper or water-permeable nonwoven fabric is placed on the vacuum conveyor 80 before the deposit 46 is placed. Is introduced, and the deposit 46 moves onto the first core wrap sheet 47. Further, after the second core wrap sheet 48 is introduced on the upper surface side of the deposit 46, the deposit 46 covered with both the core wrap sheets 47, 48 is cut at a predetermined interval to obtain one napkin. The absorber precursor 49 cut to the minute dimension is obtained. In addition, in FIG.1 and FIG.2, illustration of both the core wrap sheets 47 and 48 is abbreviate | omitted.

  And in the absorber manufacturing apparatus of this embodiment, the absorber precursor 49 obtained in this way is compressed by the pressurizing means 90, and the thickness of the deposit 46 which comprises the absorber precursor 49 is actively reduced. Thus, the intended absorber 4 (absorbent core 40) is obtained. As shown in FIG. 7, the pressurizing means 90 includes a pair of rolls 91 and 92 with smooth surfaces, and can pressurize an object to be pressed introduced between the rolls 91 and 92 from the upper and lower surfaces to compress in the thickness direction. It is configured.

  FIG. 10 schematically shows the state of the deposit 46 before and after compression. The left diagram across the arrow of FIG. 10 shows the deposit 46 before compression, the right diagram shows the deposit 46 (absorbent core 40) after compression, and in both the left and right diagrams, the upper stage shows the deposit 46 ( The cross-sectional view of the absorbent core 40), the lower part shows a perspective view of the deposit 46. When the deposit 46 is compressed by the pressurizing means 90, the partition region corresponding portion 46b (convex portion) having a relatively large absorbent material and a large thickness has a partition member corresponding portion 46a having a relatively small absorbent material and a small thickness. It is compressed more strongly than (non-convex part or concave part). As a result, the partition region corresponding portion 46b in the deposit 46 becomes a high basis weight portion 41 having a relatively high density in the absorbent core 40, and the partition member corresponding portion 46a in the deposit 46 is relatively in the absorbent core 40. It becomes a low basis weight portion 42 having a low density.

  According to the manufacturing method of the absorber described above, the relatively high density high basis weight portion 41 and the relatively low density low basis weight portion 42 are alternately formed in both the longitudinal direction X and the width direction Y. The absorbent core 40 having the concavo-convex structure can be efficiently manufactured. The ratio (D41 / D42) of the density D41 of the high basis weight portion 41 and the density D42 of the low basis weight portion 42 is preferably 1.5 to 20, and more preferably 2.0 to 10. The density of the high basic weight part 41 and the low basic weight part 42 is measured as follows.

<Density measurement method>
The density of the high basis weight portion 41 was calculated by dividing the weight of the high basis weight portion 41 by the volume (thickness × length × width) of the high basis weight portion 41. The density of the low basis weight portion 42 was calculated by dividing the weight of the low basis weight portion 42 by the volume (thickness × length × width) of the low basis weight portion 42. The “thickness” used for calculating the volume of each of the high basis weight portion 41 and the low basis weight portion 42 was measured as follows. An acrylic plate having a length of 37 mm, a width of 37 mm, and a thickness of 3 mm is placed on the absorbent core 40 to be measured, and the thickness of the high basis weight portion 41 of the absorbent core 40 is determined by a non-contact type laser displacement meter (manufactured by KEYENCE) ( The thickness of the low basis weight portion 42 is measured using a laser head LK-G30 and a displacement meter LK-GD500), and the cross section of the absorbent core 40 (see FIG. 2) using a microscope VHX-1000 manufactured by KEYENCE. It was measured by observing the cross section as shown. The “weight” of each of the high basis weight portion 41 and the low basis weight portion 42 was measured as follows. A razor made by FEATHER (feather shaving blade S single blade) is pressed against the absorbent core 40 to be measured to cut out the high basis weight portion 41 and the low basis weight portion 42 respectively, and the cut out high basis weight portion 41 and the low basis weight. The weight of each part 42 was measured using an electronic balance (an electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point).

  The present invention is not limited to the embodiment. For example, in the embodiment described above, the low basis weight portion 42 is unevenly distributed on the skin contact surface 4a side in the thickness direction of the absorbent core 40. It may be unevenly distributed on the contact surface 4b side, or may be unevenly distributed in a substantially central portion between the skin contact surface 4a and the non-skin contact surface 4b.

  Moreover, the low basic weight part 42 (42X, 42Y) of planar view linear form is formed in the absorptive core 40 whole as shown in FIG. 3 (so that the front part 12, the excretion part opposing part 11, and the rear part 13 may be straddled). A region between the at least a pair of grooves 7 and 7 (longitudinal grooves 7X and 7X) and the vicinity thereof (groove peripheral region) in the excretory part facing part 11 (of the excretion part facing part 11). It suffices if it is formed in the inner part in the width direction. Moreover, the planar view shape of the low basic weight part 42 is not restrict | limited to linear form like the said embodiment, Curve shape may be sufficient.

  Moreover, in the absorptive core 40, the high basic weight part 41 may be arrange | positioned at zigzag form. That is, a large number of high basis weight portions 41 are arranged at predetermined intervals in the longitudinal direction X to form a high basis weight portion row, and a plurality of high basis weight portion rows are arranged at predetermined intervals in the width direction Y. In this case, the pitches of the high basis weight portions 41 in the high basis weight portion rows adjacent to each other may be shifted. In other words, the high basis weight portion 41 is adjacent to the high basis weight portion 41 when projected in a direction (width direction Y) orthogonal to the high basis weight portion row in the predetermined high basis weight portion row. You may arrange | position so that it may not correspond with the projection image of the basic weight part 41. FIG. By doing in this way, the groove | channel 7 (lateral groove 7Y1 and 7Y2) extended in the width direction Y will be on the outward of the longitudinal direction X of the napkin 1 by planar view like the said embodiment (refer FIG. 3). Even if it is not formed so as to include a horizontally long shape that is convexly convex (for example, even if the lateral grooves 7Y1, 7Y2 are formed in a straight line extending in the width direction Y), the lateral grooves 7Y1, 7Y2 It can prevent that the quantity part 42 corresponds completely.

  Further, as described above, the groove 7 is sandwiched between the two high basis weight portions 41, 41 and the two high basis weight portions 41, 41 arranged in the longitudinal direction X or the width direction Y of the napkin 1. As a method of forming continuously with the individual low basis weight parts 42, in other words, as a method of not matching the groove 7 and the low basis weight part 42 of the absorbent core 40 completely, as in the above embodiment, In addition to the method of forming the groove 7 so as to include a convexly curved shape toward the outside of the napkin 1 in plan view and forming the low basis weight portion 42 in a straight line in plan view, a) relative A method of arranging a relatively small sized low basis weight portion 42 around a large sized high basis weight portion 41, and b) a plan view shape as a high basis weight portion 41 combined with the low basis weight portion 42. Method of using one kind of polygonal high basis weight part 41 of pentagon or more alone or in combination of two or more, c) A method of setting the angle formed by the forming direction of the line 7 (the extending direction of the linear groove 7) and the forming direction of the low basis weight part (the extending direction of the linear low basis weight part) to 30 to 60 °, etc. Can be mentioned.

  Moreover, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, this invention is applicable also to a disposable diaper, an incontinence pad, a panty liner etc., for example.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
A sanitary napkin having the same configuration as that of the napkin 1 shown in FIGS. 1 and 2 was produced and used as a sample of Example 1. A surface sheet (details will be described later) having a two-layer structure is used as the surface sheet, a non-moisture permeable polyethylene film having a basis weight of 30 g / m ² is used as the back sheet, and a basis weight of 20 g / using air-through nonwoven m ^2, as the core wrap sheet covering the absorbent core, using absorbent paper having a basis weight of 16g / m ^2. As an absorptive core, what was manufactured according to the method mentioned above was used. The absorptive core used in Example 1 is a block-type absorptive core having the same structure (uneven structure) as the absorptive core 40 shown in FIG. 3, and exposed softwood kraft pulp (NBKP, fiber material) as the absorptive material. And a particulate water-absorbing polymer in a weight ratio of the former: the latter = 4: 1, a mixed fiber type absorbent core, a pulp basis weight of 200 g / m ^{2 in} the entire absorbent core, and a water-absorbing polymer basis weight 50 g / m ² , basis weight of high basis weight part 300 g / m ² , high basis weight part thickness 2.0 mm, low basis weight part basis weight 140 g / m ² , low basis weight part thickness 0.8 mm, The total length in the longitudinal direction was 200 mm, and the total length in the width direction was 75 mm. Moreover, regarding the high basis weight portion, the length L2 in the longitudinal direction (see FIG. 3A) was 20 mm, and the length L3 in the width direction (see FIG. 3A) was 10 mm. Further, 18 high basis weight portions were formed per 50 cm ² area. The groove width L5 (see FIG. 3B) was 2 mm, and the groove depth L6 (see FIG. 5) was 0.5 mm.

The top sheet having a two-layer structure used in Example 1 is composed of an upper layer positioned on the skin contact surface side and a lower layer positioned on the non-skin contact surface side, and the separately manufactured upper layer and the lower layer And integrated. The upper layer was manufactured as follows. That is, first, as a non-heat-shrinkable fusion fiber, a core-sheath type composite fiber (trade name NBF-SH, core: polyethylene terephthalate, sheath: polyethylene, core / sheath weight ratio = 5/5, manufactured by Daiwa Boseki Co., Ltd. The fused fiber is defibrated using a card machine to obtain a web using a fineness of 2.2 dtex and a fiber length of 51 mm, and then the web is heat treated by an air-through method (120 ° C.) to have a basis weight of 20 g / m ^2. The air-through nonwoven fabric was obtained, and the air-through nonwoven fabric was used as the upper layer. The lower layer was manufactured as follows. That is, latent crimpable fiber (core-sheath composite fiber having heat-shrinkability with ethylene-propylene random copolymer as a core component and polypropylene as a sheath component, fineness of 2.2 dtex, manufactured by Daiwa Boseki Co., Ltd. A web having a basis weight of 20 g / m ² was produced using a card machine in the same manner as described above using a starting temperature of 90 ° C. as a raw material, and the web was used as the lower layer.

And the upper layer and the lower layer separately produced in this way are superposed to obtain a polymer, the polymer is passed through a hot embossing roll device comprising a combination of an engraving roll and a smooth roll, and heat embossing is performed, thereby both layers Were joined and integrated to obtain a nonwoven fabric having an embossed portion (concave portion). At that time, the engraving roll was brought into contact with the lower layer, and embossing was performed from the lower layer side. The engraving roll was set to 175 ° C, and the smooth roll was set to 125 ° C. The embossing pattern of the engraving roll is a so-called staggered pattern, and each embossing point constituting the pattern is circular (embossing area 0.047 cm ² ) and the distance (pitch) of the embossing points along the machine direction is The distance (pitch) of the emboss point along the horizontal direction was 7 mm, and the distance of the emboss point along the oblique 45 ° direction was 5 mm. The embossed area ratio at this time was 7.2%. Subsequently, the obtained nonwoven fabric was heat-treated (air-through process) for 1 to 3 minutes in a heat dryer heated to 130 ° C. By such heat treatment of the nonwoven fabric, the fiber exhibiting heat extensibility contained in the nonwoven fabric (upper layer non-heat-shrinkable fusion fiber) is stretched at a portion other than the embossed portion (concave portion). When the portion is fixed by the embossed portion, the stretched portion of the fiber loses its place in the plane direction of the nonwoven fabric and moves in the thickness direction of the nonwoven fabric. As a result, convex portions are formed in each of the plurality of regions surrounded by the embossed portions of the staggered pattern on both the skin contact surface and the non-skin contact surface of the nonwoven fabric. Thus, a top sheet made of a two-layered nonwoven fabric having protrusions on both sides was obtained. In this surface sheet (nonwoven fabric having a two-layer structure), the fiber density of the protrusions existing on the skin contact surface is 0.04 g / cm ³ , and the fiber density of the protrusions existing on the non-skin contact surface is 0.10 g / cm ^3. The fiber density of the embossed part was 0.70 g / cm ³ . The ratio of the total area of the embossed portion to the surface area of the topsheet _{(q 1) (q 2)} (q 2 / q 1) was 0.29.

[Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorbent core shown below was used.
Absorbent core used in Example 2: Absorbency where the uneven distribution position of the low basis weight portion in the thickness direction of the absorbent core is on the non-skin contact surface side as opposed to the absorbent core used in Example 1 Core (block type absorbent core). The absorbent core is configured in the same manner as the absorbent core used in Example 1, including the dimensions, except for the above points.

[Comparative Example 1]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorbent core shown below was used, and this was used as Comparative Example 1.
Absorbent core used in Comparative Example 1: Absorbing portions having a plurality of predetermined basis weights (portions corresponding to high basis weight portions in the absorbent core used in Example 1) are respectively in the longitudinal direction and the width direction of the absorbent core. The two absorbent parts adjacent to each other are spaced apart from each other, and there is no absorbent material between the two adjacent absorbent parts (ie, the absorbent used in Example 1). Absorbent core (block type absorbent core) in which there is no portion corresponding to the low basis weight portion in the core. The absorbent core is configured in the same manner as the absorbent core used in Example 1, including the dimensions, except for the above points.

[Comparative Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorbent core shown below was used, and this was used as Comparative Example 2.
Absorbent core used in Comparative Example 2: Absorbent material has a uniform basis weight and is distributed throughout the core, does not have a low basis weight part and a high basis weight part, and does not have an uneven structure. Absorbent core with flat contact surface and non-skin contact surface (flat absorbent core). The absorbent core is configured in the same manner as the absorbent core used in Example 1, including the dimensions, except for the above points.

[Evaluation]
About each sample (sanitary napkin) of an Example and a comparative example, the dynamic maximum absorption amount, the softness | flexibility, and air permeability were evaluated in accordance with the following method. The results are shown in Table 1 below.

<Evaluation method of dynamic maximum absorption>
The sanitary napkin was fixed to a sanitary short, and the sanitary short was attached to a dynamic model of a human body. The walking motion of the dynamic model is started, and 1 minute after the start of the walking motion, as the first fluid injection operation, 2 g of horse blood is injected into the sanitary napkin from the fluid excretion point of the dynamic model. Three minutes after the end of the liquid injection operation, as a second liquid injection operation, 3 g of horse blood was injected into the sanitary napkin from the liquid excretion point of the dynamic model, and further 3 minutes after the end of the second liquid injection operation, As a third liquid injection operation, 2 g of horse blood is injected into the sanitary napkin from the liquid excretion point of the dynamic model. The third and subsequent liquid injection operations are performed by injecting 2 g of horse blood into the sanitary napkin from the liquid excretion point of the dynamic model 3 minutes after the end of the previous liquid injection operation. Such liquid injection operation is repeated until the liquid (horse blood) exudes from the wing part of the sanitary napkin, and the maximum amount of liquid injected by the liquid injection operation performed before the liquid exudes is dynamically absorbed. The amount. The larger the value of the dynamic maximum absorption amount, the better the prevention of menstrual bleeding and the higher the evaluation.

<Flexibility evaluation method>
The bending rigidity of the absorbent core in the sanitary napkin is evaluated according to JIS L-1096 (General Textile Testing Method). As an evaluation apparatus, a handometer (model: HOM-3) manufactured by Daiei Scientific Instruments Co., Ltd. is used. The slit width of the handometer is set to 40 mm. More specifically, the absorbent body (with the absorbent core coated with the core wrap sheet) is taken out from the sanitary napkin, and the hand-held meter is used to remove the absorbent body (total length in the longitudinal direction of 200 mm, width direction) The absorbent body was bent in the longitudinal direction and the width direction at a portion 100 mm from the front end portion of the total length 75 mm), and the load value at that time was measured. The smaller the load value, the better the flexibility and the higher the evaluation.

<Breathability evaluation method>
From the sanitary napkin, a laminate of a top sheet and an absorbent body (with an absorbent core covered with a core wrap sheet) is taken out, and an elliptical inlet (length 5 cm, Using an acrylic plate provided with a width of 2.2 cm and an area of 11 cm ² ), 6 g of blood clot is injected from the injection port and then left for 1 minute. Thereafter, the surface sheet was removed from the laminate, and the remaining absorbent was used as an evaluation sample to evaluate the air permeability. The air permeability was evaluated by referring to “Paper and paperboard—Air permeability test method—Gurley test machine method” prescribed in JIS P8117 (1998), and Gurley test machine B type (trade name “GURLEY DENSOMETER”, Osamu Kumagai Performed by Kogyo Kogyo Co., Ltd. Specifically, as shown in FIG. 11, an evaluation sample 90 (with an absorbent core covered with a core wrap sheet) is placed between two acrylic plates 91 and 92 having a square shape of 50 mm in length and width. It is set on the Gurley tester with the skin contact surface of 90 in contact with one acrylic plate 91 located on the air injection side. One acrylic plate 91 has a square-shaped through hole 93 of 10 mm in length and width passing through the acrylic plate 91 in the thickness direction, whereas the other acrylic plate 92 has a through hole. Not done. Note that the weight of one acrylic plate 91 is 9.7 g, and the size of the evaluation sample 90 exceeds the size of the acrylic plates 91 and 92. Then, the time required for 300 ml of air to pass (time required for injection, seconds) was measured by the method described in JIS P8117 (1998), and the ventilation rate (ml / second) was calculated from the measured value. The greater the value of this ventilation rate, the better the air permeability and the higher the evaluation.

  As is apparent from the results shown in Table 1, Examples 1 and 2 have a larger dynamic maximum absorption value than Comparative Examples 1 and 2, are excellent in preventing menstrual bleeding, and are bent. When the load value was small, the flexibility was excellent. From this result, as described above, forming a groove with a specific structure in an absorbent core (block-type absorbent core) in which a low basis weight part and a high basis weight part are formed in a specific pattern, It was suggested that it is effective in obtaining an absorbent article that excels in absorption and diffusion of excretory fluids and is less likely to cause discomfort due to wetness of the wearer. In addition, from comparison between Examples 1 and 2 and Comparative Example 1 and Comparative Example 2, the block-type absorbent core having the concavo-convex structure is superior in air permeability as compared to the flat-type absorbent core having no concavo-convex structure. It was suggested that the ventilation effect of the air existing between the skin of the napkin wearer and the napkin is excellent.

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 11 Excretion part opposing part 12 Front part 13 Back part 2 Top sheet 3 Back sheet 4 Absorber 40 Absorbent core 41 High basic weight part 42, 42X, 42Y Low basic weight part 5 Side sheet 6 Wing part 7, 7X, 7Y1, 7Y2 Groove 71 Bottom wall portion 72 Side wall portion 45 Absorbent material 46 Deposit 49 Absorber precursor 50 Rotating drum 51 Recessed portion 52 Bottom portion 53 Partition member 54 Partition region 60 Duct 65 Vacuum box 70 Transfer roll 75 Mesh belt 80 Vacuum conveyor

Claims (8)

A vertically long absorbent article comprising a top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between both sheets,
The absorbent body is configured to include an absorbent core including an absorbent material, and the absorbent core includes a high basis weight portion in which the absorbent material is relatively large and a low basis weight in which the absorbent material is relatively small. Having a basis weight part, the high basis weight part and the low basis weight part are alternately formed in each of the longitudinal direction and the width direction of the absorbent article,
In the absorbent article, a groove is formed by recessing the top sheet and the absorbent core integrally, and the groove is at least two pieces of the side by side in the longitudinal direction or the width direction. It is formed continuously with a high basis weight part and one low basis weight part sandwiched between two high basis weight parts,
The absorbent article which the bottom wall part which defines the said groove | channel is located in the non-skin contact surface side rather than the thickness direction center of the said absorbent core.   2. The absorbent article according to claim 1, wherein the density of the vicinity of the groove is different between the high basis weight part and the low basis weight part.   The groove is a vertically long shape that is convexly curved outward in the width direction of the absorbent article in a plan view at both side portions along the longitudinal direction of the absorbent article in the excretory part facing portion of the absorbent article. The absorbent article of Claim 1 or 2 currently formed so that it may contain.   The absorbent article according to claim 3, wherein the low basis weight part is formed so as to include a linear part extending in a longitudinal direction of the absorbent article in a plan view.   The low basis weight portion is formed so as to include a linear portion extending in the width direction of the absorbent article in plan view, and the groove is outward in the longitudinal direction of the absorbent article in plan view. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is formed so as to include a horizontally long shape that is convexly curved toward the surface.   The high basis weight portion has a thickness larger than that of the low basis weight portion, and the absorbent core has a concavo-convex structure in which the high basis weight portion is raised as compared with the low basis weight portion. The absorbent article as described in any one of 5.   The absorptive article according to claim 6 in which said low basic weight part is unevenly distributed in the skin contact surface side in the thickness direction of said absorptive core in the section view of said absorptive core.   The absorptive article according to claim 6 in which said low basic weight part is unevenly distributed to the non-skin contact surface side in the thickness direction of said absorptive core in the section view of said absorptive core.

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