JP5881366B2 - Absorber - Google Patents

Description

  The present invention relates to an absorbent body used for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pants.

  In absorbent articles, such as a disposable diaper, the material and structure of each member were improved and the function and the feeling of wear have been improved. In addition, an absorbent body applied to an absorbent article has been developed with the aim of such improvement, and recently, various types of functional bodies have been proposed depending on the use situation and the type of article.

For example, in Patent Document 1, a physiological sheet having a surface sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorbent body in which a large number of individual small absorbent portions are fixed to the intermediate sheet. An article is disclosed. This absorbent body realizes a sufficient amount of liquid to be retained, is flexible, fits very well on the undulations of the skin, has high tracking performance, and greatly improves the feeling of wearing. Can do.
Moreover, about the thin absorber of sheet form, there exist some which suppressed omission of an absorption polymer and fully exhibited the absorption performance (patent documents 2-4). In any case, the absorption performance is improved by arranging the absorbent polymer and immobilizing it, not by designing the shape of the absorber.

JP 2009-273868 A JP-A-5-38350 International Publication No. 01/0889439 Special table 2010-535572

  The inventors of the present invention have achieved both the absorption of a sufficient amount of liquid and the like in the absorber and a comfortable wearing feeling by the absorber according to Patent Document 1 developed previously. On the other hand, an absorber having a small absorption part (block) is desired to be further suppressed and strengthened due to its flexibility from the viewpoint of maintaining the performance.

  The present invention retains the excellent body suitability and motion following properties of an absorbent body having a conventional small absorbent portion, and the shape of the absorbent body is maintained even in liquid absorption due to repeated excretion and a large amount of excretion, and It is an object of the present invention to provide an absorbent body capable of improving absorption performance and quickly recovering and maintaining absorbency by quickly dealing with the excretion.

  Said subject is an absorber provided with an absorptive core and the covering sheet which covers the 1st surface and the 2nd surface used as the symmetrical surface of this absorptive core, and the above-mentioned covering sheet consists of nonwoven fabrics, and said absorptivity The core has a high basis weight part and a low basis weight part having a lower basis weight, and the plurality of high basis weight parts are spaced apart from each other, and the low basis weight part surrounds the high basis weight part. It is continuously arranged in the plane direction, the high basis weight part is thicker than the low basis weight part, and the low basis weight part is unevenly distributed on the first surface side of the absorbent core. Concave portions are arranged on the surface side, whereby the second surface side of the absorbent core has a concavo-convex structure, and the first and second surfaces of the absorbent core and the covering sheet are strips coated with an adhesive. The problem has been solved by the absorber bonded so as to fix the high basis weight portion in the coating area.

  When the absorbent body of the present invention is used for an absorbent article, it retains the excellent body conformity and follow-up performance of the conventional absorbent body having a small absorbent part, and repeats excretion and a large amount of excretion Even in the liquid absorption by this, the shape of the absorbent body is maintained, and the absorption performance is improved so that the excretion can be quickly recovered and retained in response to the excretion.

It is sectional drawing which shows typically the thickness cross section in the width direction about the absorber as one Embodiment (1st Embodiment) of this invention. It is the perspective view typically shown from the 1st surface side of the absorptive core which concerns on the absorber of 1st Embodiment. It is the top view which showed typically the preferable embodiment of the protrusion absorption part of the absorptive core which concerns on the absorber of 1st Embodiment, and the strip | belt-shaped coating area of an adhesive agent from the 2nd surface side of the absorptive core. It is explanatory drawing which expands partially and shows typically the relationship between the protrusion absorption part of the absorptive core shown in FIG. 2, and the strip | belt-shaped coating area of an adhesive agent. It is the top view which showed typically another desirable arrangement | positioning of the protrusion absorption part of the absorptive core which concerns on 1st Embodiment from the 2nd surface side of the absorptive core. It is explanatory drawing which shows typically the relationship between the arrangement | positioning direction of the strip | belt-shaped coating area and the arrangement | positioning direction of a recessed part absorption part (or recessed part) in the embodiment of FIGS. It is the top view which showed typically another desirable arrangement | positioning of the protrusion absorption part of the absorptive core which concerns on 1st Embodiment from the 2nd surface side of the absorptive core. It is sectional drawing which shows typically the thickness cross section in the width direction about the absorber as another embodiment (2nd Embodiment) of this invention. It is explanatory drawing shown from the 2nd surface side of the absorptive core about preferable arrangement | positioning with the protrusion absorption part and fluff part which concern on 2nd Embodiment.

1-1 is sectional drawing which shows typically the thickness cross section in the width direction (X direction) about the absorber of one Embodiment (1st Embodiment) of this invention. 1-2 is a perspective view schematically showing from the first surface side of the absorbent core according to the absorbent body of the first embodiment. FIG. FIG. 2: is the top view which showed typically the preferable embodiment of the protrusion absorption part of the absorptive core which concerns on the absorber of 1st Embodiment, and the strip | belt-shaped coating area of an adhesive agent from the 2nd surface side of the absorptive core. It is.
As illustrated in FIG. 1A, the absorbent body 1 according to the first embodiment includes an absorbent core 3 and a covering sheet 2 that covers the first surface 3a and the second surface 3b that are symmetrical surfaces of the absorbent core 3. Hereinafter, what is disposed on the first surface 3a side is referred to as a covering sheet 21, and what is disposed on the second surface 3b side is referred to as a covering sheet 22.), and the covering sheet 2 is made of a nonwoven fabric. The covering sheets 21 and 22 may be separate non-woven sheets as long as they cover the first surface 3a and the second surface 3b, and both surfaces are covered with a single sheet. There may be.

In the present invention, the first surface and the second surface of the absorbent core are planar portions of the absorbent core, and the absorbent body including the absorbent core is applied to an absorbent article such as a disposable diaper. Furthermore, it is a surface arranged on the skin contact surface side or the non-skin contact surface side. In that case, any one of the first surface and the second surface may be disposed on the skin contact surface side, and can be arbitrarily arranged depending on the purpose of the absorbent article. In the absorbent article to which the absorbent body of the present invention is applied, unless otherwise specified, the surface that contacts the human body is called the skin side surface or the skin contact surface or the surface, and the surface on the opposite side is the non-skin surface Also called non-skin contact surface or back surface.
Moreover, the normal line direction of the 1st surface or 2nd surface of the absorber of this invention is called thickness direction, and the quantity is called thickness. Furthermore, the longitudinal direction in the plan view of the absorbent body corresponds to the direction from the abdominal side part to the back side part across the crotch part when this is applied to the absorbent article and worn on the wearer, and this longitudinal direction. The orthogonal direction is referred to as the width direction (X direction in FIG. 1).

The absorbent core 3 is obtained by stacking pulp fibers, has a thickness (h ₁ ), and a protruding absorbent portion 33 as a high basis weight portion having a relatively high basis weight of the stacked fabric, It has the recessed part absorption part 34 as a low basic weight part with a lower basic weight. A plurality of the projecting absorption parts 33 are arranged in the plane direction so as to be separated from each other, and the concave part absorption parts 34 are continuously arranged in the plane direction so as to surround the projecting absorption part 33 (FIG. 1-2). reference). And the protrusion absorption part 33 has thickness rather than the recessed part absorption part 34 as a liquid holding part, the recessed part absorption part 34 is unevenly distributed in the 1st surface 3a side of the absorptive core 3, and is recessed in the other 2nd surface 3b side. 35 is arranged, whereby an uneven structure is formed on the second surface 3 b side of the absorbent core 3. That is, when viewed from the second surface 3b side of the absorbent core 3, the plurality of protruding absorbing portions 33 are arranged in a discontinuous manner on the second surface 3b side (see FIG. 2). Between the protruding absorption part 33, the recessed part 35 hollow in the thickness direction from the 2nd surface 3b side of the absorptive core 3 to the 1st surface 3a side, and a part of absorptive core located in the 1st surface 3a side And a recessed portion absorbing portion 34 (see FIG. 1). The absorptive core 3 has a sea-island structure in which the protruding absorbing portion 33 is present in the recessed portion absorbing portion 34 (see FIGS. 1-2 and 2). Moreover, the 1st surface 3a side of the absorptive core 3 has comprised the flat shape with the recessed part absorption part 34 and the skin side surface of the protrusion absorption part 33. FIG.

  Since the absorbent core 3 of the present embodiment continuously arranges the liquid-absorptive protruding absorbent portion 33 and the recessed portion absorbent portion 34 due to the difference in the basis weight of the pulp fiber, when used for absorbent articles, It has more flexible deformability with pressure, higher shape recovery and shape maintainability than those in which the conventional small absorbent portion and the base sheet are fixed by the joint, and it also has liquid drawability, liquid transferability, liquid Improvement of return and liquid residue control is achieved. In addition, the absorbent core 3 of the present embodiment does not have a joint portion unlike the conventional one, so that the absorbent portion is not easily torn or lifted when wet due to excretion or the like. Furthermore, from the same viewpoint, it is preferable that the entire absorbent core 3 including the recessed portion absorbing portion 34 and the protruding absorbing portion 33 has an integral structure without an interface. This point will be described in detail below.

  The protrusion absorption part 33 is made into a high basic weight part because it is thicker than the recessed part absorption part 34, and becomes a part which contains many pulp fibers and absorbs and retains excretory fluid. The recessed portion absorbing portion 34 is connected so as to surround the protruding absorbing portion 33 on the first surface 3a side (see FIG. 1-2), and the protruding absorbing portion 33 is partitioned by the recessed portion 35 on the second surface 3b side ( The protrusion absorption part 33 becomes a flexible flexible part with the recessed part absorption part 34 as a starting point. Therefore, in the absorbent article using the absorbent body 1 having the absorbent core 3, “body compatibility” that fits the undulation of the skin surface, and a part of the skin that follows the movement of the wearer well. The “trackability” that prevents the occurrence of a gap is extremely high. In addition, since the block-like protruding absorbing portion 33 itself becomes a support column of the absorbent body 1 and tries to maintain the shape, liquid return and twist due to external pressure can be effectively prevented. In addition, the shape and arrangement | positioning of the protrusion absorption part 33 can take an appropriate shape from a viewpoint of the suitable absorption holding | maintenance property of a liquid, and the shape stability at the time of the wetness after the urination mentioned later.

  The recessed portion absorbing portion 34 has a low basis weight due to a small amount of fiber, and also has a low thickness and a low density when the fiber is thin, so that the liquid flow resistance is low. The liquid can be quickly transmitted in the thickness direction of the absorber without impairing the pressure loss. Moreover, the recessed part absorption part 34 has spread continuously in the plane direction (refer FIG. 1-2), and the protrusion absorption part 33 is arranged by being surrounded by the recessed part absorption part 34 at the time of the liquid absorption by the 1st surface. Further, on the second surface, since the liquid is guided to the recess of the recess absorbing portion 34, the contact with the liquid is good, and the liquid can be quickly drawn into the absorber 3 in a wide range. In the absorbent article using the absorbent body 1 having the absorbent core 3, the recessed portion absorbing portion 34 serves as a liquid guiding path, and the excretory fluid can be quickly delivered to the scattered liquid retaining protruding absorbing portions 33. . In the delivery of the liquid, it is preferable that the protruding absorbing portion 33 has a higher density than the recessed portion absorbing portion 34. By doing so, the liquid that has passed through the recess absorbing portion 34 is more easily taken into the protruding absorbent portion 33 by the capillary force generated by the fiber density difference or density gradient between the recess absorbing portion 34 and the protruding absorbent portion 33. Holds moving in the direction. In addition, even when high-viscous liquid such as loose stool or menstrual blood is excreted in large quantities at once or repeatedly excreted, even if it cannot be absorbed and retained by the projecting absorbent part 33 at once, the concave part absorbent part 34 has a thickness direction The concave portion 35 connected to the surface serves as a buffer function for temporarily holding the liquid, and also serves as a diffusion function that prevents the liquid from being retained in the boundary region between the high density portion and the low density portion. As described above, the liquid passing structure including the recessed portion absorbing portion 34 and the recessed portion 35 (see FIG. 1-1) allows the liquid to be quickly taken into the absorbent body 3 from the skin contact surface side and reliably absorbed by the protruding absorbing portion 33. Can be retained. This makes it difficult for the liquid to remain or return.

  The absorptive core 3 which has the protrusion absorption part 33 and the recessed part absorption part 34 can be obtained using the fiber-fiber pile apparatus used for this kind of goods. For example, it is formed by stacking pulp fibers with respect to a structure in which a partition plate is arbitrarily arranged in a hollow portion (pulp fiber accumulation portion) on the outer periphery of the stacking drum.

  As described above, the covering sheet 2 (reference numerals 21 and 22) covering the absorbent core 3 is made of a nonwoven fabric. Since the covering sheet 2 is a non-woven fabric, high strength can be obtained even when wet compared to conventionally used thin paper such as hydrophilic tissue paper, which is related to the degree of wetting by excretory fluid. Therefore, the covering sheet 2 is not easily torn in response to the high flexibility of the absorbent core 3 described above and good body compatibility and motion followability, and the wearer rolls over after excreting the liquid. Even when walking, the covering sheet 2 is not easily broken, and the stable shape of the absorbent core 3 can be maintained.

  As shown in FIG. 1A, the coating sheet 21 and the first surface 3 a side of the absorbent core 3, and the coating sheet 22 and the second surface 3 b side of the absorbent core 3 are coated with an adhesive 4. In the work area 5 (hereinafter, the one on the first surface 3a side of the absorbent core 3 is referred to as a belt-shaped coating area 5a, and the one on the second surface 3b side is referred to as a belt-shaped coating area 5b). It is joined so that the protrusion absorption part 33 may be fixed. The strip-shaped coating area 5a and the strip-shaped coating area 5b may be disposed at the same position or may be disposed at shifted positions. In the present embodiment, it is preferable that the strip-shaped coating area 5a and the strip-shaped coating area 5b are arranged at positions shifted in the width direction (X direction) of the article so as not to completely overlap. The strength of the nonwoven fabric of the covering sheet 2 can effectively contribute to the shape stability of the absorbent core 3 due to the shifted arrangement of the belt-like coating areas 5a and 5b. Specifically, either side of the absorbent body having a concave structure while suppressing the increase in rigidity due to fixing by dispersing adhesive portions that tend to be hard by suppressing overlap of both belt-shaped coating areas in the surface direction The concave position can be covered with the belt-like coating areas 5a and 5b, and the division of the concave absorbent body 34 can be prevented. Furthermore, continuity can be maintained, maintaining the flexibility of a concave part by fixing the protrusion absorption part 33 to the coating sheet 2 of a nonwoven fabric firmly. Thereby, shape recovery property and shape maintenance property can be maintained, without inhibiting the flexible deformability of the above-mentioned absorptive core 3. FIG. Furthermore, by making the fixing range different between the first surface 3a side and the second surface 3b side of the absorbent core 3, the protruding absorbing portion 33 can be fixed in a wide range and stability can be enhanced.

  For example, as shown in FIG. 1, when the belt-shaped coating area 5 is disposed in the vicinity of the center of the protruding absorption portion 33 like the band-shaped coating region 5 a on the first surface 3 a side, the protruding absorption portion 33 is strengthened. It is preferable that it can be firmly fixed to the non-woven fabric covering sheet 2. Moreover, when it arrange | positions in the area | region which cross | intersects the adjacent protrusion absorption part 33 like the strip | belt-shaped coating area | region 5b in the 2nd surface 3b side, more protrusion absorption parts 33 can be fixed and it is preferable. Thus, fixing in a wide range is possible by combining different coating areas. In addition, as for the strip | belt-shaped coating areas 5a and 5b, it is also possible to replace a coating surface. Moreover, it is preferable that the strip | belt-shaped area | regions 5a and 5b are arrange | positioned intermittently in the longitudinal direction of the absorber 1 on each side (this point is mentioned later. Refer FIG. 2). As a result, a large number of protruding absorbing portions 33 can be fixed, and on the other hand, they can be flexibly deformed and brought into close contact with the pressure in the width direction when mounted as an absorbent article or the curvature in the vicinity of the buttocks.

In order to make the above action effective, the overlap width (w ₃ , overlap) of the strip coating area 5b with respect to the width (w ₁ + w ₂ ) of the portion where the strip coating area 5a and the strip coating area 5b do not overlap each other. If not, the separation width is a negative value) ratio (w ₃ / (w ₁ + w ₂ )) is preferably −0.3 to 0.5, more preferably −0.1 to 0.3. By setting it as the said lower limit or more, it becomes a structure by which an absorber does not collapse easily, and it becomes the structure by which the hardness of an absorber is relieve | moderated by setting it as the said upper limit or less.

  In the absorbent body 3, flexibility and shape maintainability can be achieved by arranging the strip-shaped coating area 5 for fixing the absorbent core 3 and the covering sheet 2 made of nonwoven fabric as described above. Moreover, although the absorptive core 3 may contain an absorptive polymer for higher liquid fixation, it is preferable that it is pinched | interposed into the pulp fiber inside the protrusion absorption part 33 (not shown). ). Thereby, it is possible to avoid the possibility that minute irregularities are formed on the surface of the absorbent body due to the expansion of the absorbent polymer due to liquid absorption and the adhesive portion of the surface band-shaped coating area 5 is peeled off. It is preferable that the absorbent polymer to be sandwiched is easy to maintain the shape of the protruding absorbent portion 33 itself due to the viscosity of the absorbent polymer.

The coating pattern in the plan view of the adhesive in the belt-shaped coating area 5 forms a wide coating area from the viewpoint of securing adhesive strength, liquid permeability, and flexibility of the absorbent core 3. Non-planar forms are preferred, and examples include linear (meandering), dot, omega, and spiral shapes. The adhesive application device may be a contact type or a non-contact type, and a die coater, spiral spray, omega nozzle, curtain spray, beat nozzle, roll coater, gravure coater, screen roll coater or the like can be used. Further, when applying the adhesive, attention should be paid especially to the amount of the adhesive used, and the application method is preferably one that ensures liquid permeability and adhesive strength. Specifically, various coaters are used. A method of applying an adhesive by making it approach (contact) a non-woven fabric in stripes using a method (a method of arranging a plurality of adhesive application portions extending in a strip shape in one direction at predetermined intervals in a direction intersecting the one direction) Or a method of applying an adhesive in a non-contact state (indirect coating) by performing pattern control by an air flow using an omega nozzle, a summit nozzle, or the like.
Adhesive, as a coating basis weight in the coating zone is preferably ^{0.5~7g / m 2, 1~5g / m} 2 is, but from the viewpoint of maintaining the shape of the absorber, substantial coating The working basis weight is preferably ⁵ to 50 gm ² or 7 to 40 g / m ² from the viewpoint of preventing peeling from the absorber.

  When the adhesive 4 is applied in the above-described coating pattern 5 in the belt-shaped coating area 5, the adhesive 4 overlaps with as many protruding absorbing portions 33 as possible, so that it is more effective with a small amount of adhesive applied. The protrusion absorbing portion 33 can be fixed to the surface. Hereinafter, an embodiment of a preferable combination of the coating pattern of the adhesive 4 and the arrangement of the protruding absorbing portion 33 will be described with reference to FIGS.

(Embodiment 1 relating to the arrangement of the protruding absorbing portion 33 and the belt-like coating area 5)
FIG. 2 schematically shows a preferred embodiment 1 of the protruding absorbent portion 33 of the absorbent core 3 according to the first embodiment and the strip-shaped coating area 5 of the adhesive 4 from the second surface side of the absorbent core. It is a top view. FIG. 3 is an explanatory view schematically showing a partially enlarged relationship between the protruding absorbent portion of the absorbent core shown in FIG. 2 and the band-shaped coating area of the adhesive, and (a) shows the protruding absorbent portion. (B) shows typically the relationship between the arrangement | positioning direction of a strip | belt-shaped coating area, and the arrangement | positioning direction of a recessed part absorption part (or recessed part). In FIG. 2, other members are omitted for the sake of understanding of the absorbent core 3 and the belt-like coating area 5, and other members are omitted. , 7 is also the same).
As shown in FIG. 2, the protruding absorption portion 33 of Embodiment 1 has a width and a longitudinal protruding absorption portion 33 a in which a substantially rectangular shape in plan view is arranged along the longitudinal direction (Y direction) of the absorber 3. It is distinguished from the width-direction protruding absorbing portion 33b arranged along the direction (X direction). Longitudinal protruding shape and size of the absorption unit 33a and the width direction protruding absorbing section 33b is substantially the same (the longitudinal length k ₁ and the width direction length k ₂ are the same), only the arrangement directions are different. Adjacent longitudinal protruding absorption portions 35a and width protruding absorption portions 35b are alternately arranged in the vertical and horizontal directions so as to have predetermined gaps s and r (see FIG. 2) relative to each other in a natural state.

In FIG. 2, reference numeral 42 indicates an adhesive applied between the second surface 3 b of the absorbent core 3 and the covering sheet 22, and is indicated by a solid line. The coating pattern of the adhesive 42 has a planar shape meandering linearly, and this coating region becomes a strip-shaped coating region 5b formed in the longitudinal direction (Y direction) with a width (w ₂ + w ₃ ). In this linear adhesive 42, the protruding absorbing portion 33 protruding toward the second surface 3 b is joined and fixed to the covering sheet 22. On the other hand, the code | symbol 41 is the adhesive agent coated between the 1st surface 3a of the absorptive core 3, and the coating sheet 21, and is shown with the dashed-dotted line. The coating pattern of the adhesive 41 is a planar shape meandering linearly like the adhesive 42, and this coating region is a strip shape formed in the longitudinal direction (Y direction) with a width (w ₁ + w ₃ ). It becomes the coating area 5a. In this linear adhesive 41, the protruding absorbing portion 33 and the recessed portion absorbing portion 34 on the first surface 3a side are continuously joined and fixed to the covering sheet 21.

In Embodiment 1, as described above, when the longitudinal-direction protruding absorbing portion 33a and the width-direction protruding absorbing portion 33b are arranged, the recessed portion absorbing portion 34 (or recessed portion 33) surrounding these protruding absorbing portions 33 is regarded as a line in plan view. When this occurs, the line does not form a straight line from the longitudinal edge of the absorber 3 to the opposite edge, but has a three-cross shape (see FIG. 3A). The three intersecting shape is a form of a line in which a plurality of lines do not intersect in a straight line when viewed from the concave portion absorbing portion 34 in a plan view and branch into a Y shape, a Z shape, or the like. Thus, such as orientation _g 1, _{g 2} of the recesses absorbing portion 34, strip coating region 5 (5a and 5b) angle alpha ₁ not parallel to the laying direction _{f 1} of, alpha ₂ of the inclined (See FIG. 3B), and the portion where the protruding absorbing portion 33 enters into the belt-shaped coating area 5 increases (see FIG. 3A). As a result, for example, the area of the protruding absorbent portion 33 to which the adhesive 42 meandering linearly is applied to the width (w ₂ + w ₃ ) of the strip-shaped coating area 5 b on the second surface 3 b side of the absorbent core 3. And the number increases, and the fixing of the protruding absorbing portion 33 becomes more reliable. To the application of the adhesive 4 to the projected absorbing unit 33 as described above and more efficient, arrangement of the strip-shaped coating zone orientation g ₁ and g ₂ of the recesses absorbing portion 33 (or recesses 35) total angle to the arrangement direction _{f 1 (α 1 + α 2} ) is preferably from 10 to 60, 15 to 50 is preferred. By setting the above lower limit or more, it becomes an arrangement in which the protruding absorption portion 33 and the concave absorption portion 34 are stably fixed regardless of the individual coating patterns, and by setting the upper limit or less, in addition to the above effects, the liquid diffusion direction It becomes the arrangement which is easy to guide moderately in the longitudinal direction of an absorber.

Further, when the belt-like coating region 5 (5a and 5b) arranged direction f protruding absorbing portion 33 along _one and the recess absorbing portion 34 of is disposed alternately, the first surface 3a of the absorbent core 3 It becomes easy to join the protrusion absorption part 33 and the recessed part absorption part 34 continuously in a longitudinal direction. Thereby, it becomes easy to suppress the division of the absorber, which is preferable.

On the second surface 3 b side of the absorbent core 3, the bonded portion between the absorbent core 3 and the covering sheet 22 is a portion where the protruding absorbent portion 33 and the adhesive 42 overlap in a plan view. On the other hand, since the covering sheet 22 and the absorbent core 3 are not in contact with each other at the portion where the concave portion 35 and the adhesive 42 overlap, they are not joined. If there are too many unbonded portions, the bonding strength between the absorbent core 31 and the surrounding nonwoven fabric 32 is weakened, so that the members are easily separated from each other, and the shape of the absorbent body becomes unstable.
However, the adhesive 4 applied to the absorbent core 3 of Embodiment 1 is a meandering path along the longitudinal direction of the absorbent body 1. By adopting such a meandering path, the adhesive can be efficiently applied to a wide area. Furthermore, the path in plan view of the recess 35 on the second surface 3b side of the absorbent core 3 coincides with the path of the recess absorber 34 and has the above-described three-intersection shape. That is, the recess 35 does not have a linear shape continuous in the longitudinal direction of the absorber 1. Therefore, the adhesive portion meandering along the longitudinal direction of the absorber 1 and the concave portion 35 are less likely to overlap in plan view, and the overlapping portion of the protruding absorbent portion 33 and the adhesive 42 can be intentionally increased. The bonding strength between the absorbent core 31 and the surrounding nonwoven fabric 32 can be improved. In order to apply the adhesive 42 to such a large number of the absorbing portions 33, the ratio between the amplitude width (w ₂ + w ₃ ) and the period (h ₅ ) of the meandering coating pattern of the adhesive 42 (see FIG. 2) ) Is preferably 4/1 to 1/2, more preferably 3/1 to 1/1.

  The operation and effect of the arrangement of the protruding absorbing portion 33 and the arrangement of the adhesives 41 and 42 according to the first embodiment will be further described. As shown in FIG. 2, it is preferable that a plurality of strip regions 5 a and 5 b shifted in the width direction (X direction) are arranged in the longitudinal direction of the absorbent body 1 on each side. First, by being a plurality of strips, the adhesives 41 and 42 can finely capture the protruding absorbing portion 33 and can be bonded and fixed to the covering sheets 21 and 22. Thereby, since the protrusion absorption part 33 is not leaked and it is possible to avoid unnecessarily bonding and fixing, it is preferable that both the adhesive strength and the excellent flexibility of the absorbent core 3 are realized. Furthermore, it is preferable that the belt-like regions 5a and 5b are arranged in the longitudinal direction, so that it is easy to flexibly respond to the pressure from the width direction. In particular, when the absorbent body 1 is applied to an absorbent article and attached to the body, for example, when the sanitary napkin is stretched from the excretion point to the buttocks, it curves in the longitudinal direction along the roundness of the buttocks. Slowly deforms into a so-called saddle shape or hyperbolic parabolic shape that fits in the crack moderately while conforming by gently curving to the roundness of the ring, and fits the crack without almost leaving a gap. Can do.

  In addition, about the application | coating shape of the adhesive agents 41 and 42, it has shown typically and is not necessarily limited to what was illustrated in implementation of this invention. The belt-like coating area 5 (5a and 5b) of the adhesive 4 is not limited to that of the first embodiment, and the width, length, and direction can be changed as appropriate according to the application. The surface and the second surface can be applied with different coating means and coating patterns. In addition, the arrangement of the protrusion absorbing portion 33 can be appropriately selected depending on the application and function, and is not particularly limited. For example, a staggered arrangement (the projected image is substantially the same in the longitudinal direction and / or the width direction). It may be an arrangement having a half-pitch shift (see FIG. 5A). The protruding absorbing portion 33 has a substantially rectangular shape with a slight roundness in plan view, but the shape is not particularly limited in the present invention, and an arbitrary shape can be adopted. Moreover, the protrusion absorption part 33 does not need to be a fixed shape like that illustrated in the figure, and preferably has a three-dimensional shape as a whole. Further, the vertical and horizontal arrangements of the projecting and absorbing portions 33 are not limited to the above, and are preferably determined appropriately according to the application.

In the first embodiment, from the viewpoint of applying the adhesives 41 and 42 to many protruding absorbing portions 33, the recessed portion absorbing portion 34 (or the recessed portion 35) may have an odd number of intersections in addition to the three intersecting shape. Examples of the odd intersection shape include a Y-intersection with an intersection angle of about 60 °, a 5-intersection shape by a combination of triangles, and a 7-intersection shape. Unlike the even cross shape, the odd cross shape is preferable because it is easy to form the recess absorbing portion in a direction different from the disposing direction f ₁ of the belt-like coating area.

Furthermore, for efficient joining of the protruding absorbent portion 33 by the adhesives 41 and 42, various modes are adopted in which the protruding absorbent portion 33 enters more in the belt-shaped coating area 5 without being limited to the odd-numbered intersecting shape including the three intersecting shapes. be able to. As this aspect, for example, it can be realized by a linear direction g _n angle α parallel or inclination angle other than a right angle with respect to the laying direction f ₁ of the band-shaped coating region 5 of the recess absorbent portion 34. The inclination angle α may be, for example, a combination of various shapes of the planar shape of the protruding absorbing portion 34, or an inclination of the arrangement of the protruding absorbing portion 34 with respect to the longitudinal direction. One example of such an embodiment is described below with reference to FIGS. 4-1 and 4-2.

(Embodiment 2 regarding arrangement | positioning of the protrusion absorption part 33 and the strip | belt-shaped coating area 5)
FIG. 4-1 schematically shows Embodiment 2 of the absorbent core protruding absorbent portion 33 and the strip-shaped coating region 5 of the adhesive 4 according to the first embodiment from the second surface 3b side of the absorbent core. It is a plan view, and shows a part of the absorbent core 3 in an enlarged manner. 4-2 is explanatory drawing which shows typically the relationship between the arrangement | positioning direction of the strip | belt-shaped coating area in the embodiment of FIG. 4-1, and the arrangement | positioning direction of a recessed part absorption part (or recessed part).
Embodiment 2 is the same as Embodiment 1 except for the shape and arrangement of the projecting absorbing portion 33. The protruding absorbing portion 33 adopts a plurality of different shapes such as a pentagon, a triangle, and a trapezoid as the shape in plan view, and the concave portion 33 is formed radially from the substantially central region in plan view of the absorbent core 31. It arrange | positions so that it may extend toward a periphery (refer FIG. 4-1). In this way, to the laying direction _{f 1} of the band-shaped coating region 5, orientation _{g 11, g} 12 of recess absorbing portion 34 (or recesses 35), ... it is the inclination angle beta ₁ and beta ₂ (See Fig. 4-2). Due to the inclination angles β ₁ and β ₂ , the protruding absorbing portion 33 can enter the strip-shaped coating area 5 in a large amount and the adhesive 4 can be applied efficiently. Thereby, since the protrusion absorption part 33 can be reliably adhere | attached and fixed to the coating sheet 2 similarly to Embodiment 1, the shape maintenance of the absorptive core 3 is obtained effectively and it is preferable. To the application of the adhesive 4 to the projected absorbing unit 33 as described above and more efficient, arrangement of the strip-shaped coating zone orientation g ₁ and g ₂ of the recesses absorbing portion 33 (or recesses 35) The total angle (β ₁ + β ₂ ) with respect to the installation direction f ₁ is preferably 20 ° to 120 °, more preferably 30 ° to 80 °. In addition to the above-mentioned effect by setting it to the above lower limit or more, it is possible to limit the direction in which flexibility is easily developed, and it is easy to suppress the splitting of the absorber, and by setting the upper limit or less, It becomes easy to prepare and fix the overlapping portion with the protruding absorbing portion 33.

In the absorber 1, about the arrangement | positioning of the protrusion absorption part 33, any of the said Embodiment 1 and Embodiment 2 may be employ | adopted, and it is good also as what combined both aspects. Further, as shown in FIG. 5 (b), it may be combined with the staggered arrangement of the protruding absorbing portions 33, or the staggered arrangement may be present on the entire surface as shown in FIG. 5 (a). . In FIG.5 (b), arrangement | positioning of Embodiment 2 is applied to the rear part, and the staggered arrangement | positioning is applied to the center part and the front part. When this absorbent body is applied and applied to an absorbent article, the flexibility can be increased so that the wearer can easily adhere to the periphery of the rounded buttock.
Further, in addition to or in combination with the first embodiment and the second embodiment, the planar shape on the first surface 3a side and the planar shape on the second surface 3b side of the protrusion absorbing portion 33 are made different from each other to form the second surface 3b. It is also preferable to develop functions such as improving the application efficiency of the adhesive 4 on the side and preventing the protrusion absorbing portion 33 from collapsing. As an example, for example, the protrusion absorbing portion 33 is weakly compressed to widen the area of the tip of the protrusion absorbing portion 33 (improvement of contact with the adhesive), and the width of the tip of the protrusion absorbing portion 33 is reduced. Examples include a taper shape (prevention of collapse from the tip of the protruding absorbing portion).

(Second Embodiment)
Furthermore, in order to improve the shape stability of the absorbent core 3 as an absorbent body 20 of another embodiment (second embodiment) of the present invention, it is combined with the band-shaped coating area 5 by the adhesive 4 and absorbs. The fluffing part 6 which fluffed the fiber by the side of the absorptive core 3 of the coating sheet 22 distribute | arranged to the 2nd surface 3b side of the core 3 can be provided. This point will be described below with reference to FIGS.
FIG. 6 is a cross-sectional view schematically showing a thickness cross section in the width direction of the absorbent body 20 as the second embodiment. FIG. 7 is an explanatory view showing a preferred arrangement of the protruding absorbent portion 33 and the fluff portion 6 according to the second embodiment from the second surface side of the absorbent core. In FIG. 7, in order to understand the arrangement relationship between the protruding absorption part 33 and the fluffing part 6, other members are not shown to avoid complication. Therefore, only the fluff portion 6 of the covering sheet 22 is schematically shown without showing the covering sheet 22.

As shown in FIG. 6, the absorbent body 20 includes the absorbent core 3 and the covering sheets 21 and 22 as in the absorbent body 1 of the first embodiment, and the covering sheet 2 is made of a nonwoven fabric. Between the absorbent core 3 and the covering sheets 21 and 22, strip-shaped coating areas 5a and 5b to which the adhesive 4 is applied are disposed.
The absorbent body 20 is formed with a fluff portion 6 made of fibers of the covering sheet 22 on the second surface 3b side. The fluff 6 enters the recess 35 of the absorbent core 3 and fills the gap. The fluff portion 6 is disposed in the concave portion 35 so as to support the side wall of the adjacent protruding absorption portion 33 and suppress excessive deformation of the protruding absorption portion 33. On the other hand, the fluff portion 6 has elasticity made of fibers and does not unnecessarily hinder the flexibility of the protruding absorbent portion 33. That is, while the fluff portion 6 reinforces the shape stability of the absorbent core as a supplement to the band-shaped coating region 5, the inherent flexibility of the absorbent core 3 is maintained in that portion. Therefore, the belt-shaped coating area 5 and the fluff portion 6 are preferable because both higher flexibility and shape maintainability can be achieved.

  In the absorbent body 20, the strip-shaped coating area 5a and the strip-shaped coating area 5b may be disposed at positions shifted as in the embodiment of FIG. 1, and are disposed at substantially the same position. It may be a thing. From the viewpoint of proper fixing of the protruding absorbing portion 3, the belt-like coating area 5b on the second surface 3b side is preferably disposed at a position where the fluff portion 6 is not present. By doing in this way, the adhesive 4 does not enter between the fibers of the fluff portion 6 and is not wasted. Or the fiber of the fluff part 6 and the side wall of the protrusion absorption part 33 are adhere | attached with the adhesive agent 4, and it can prevent that the softness | flexibility of the protrusion absorption part 33 is inhibited more than necessary.

  As an example of arrangement | positioning of the strip | belt-shaped coating area 5b, the fluffing part 6, and the protrusion absorption part 33, there exists a planar arrangement | positioning as shown in FIG. FIG. 7 shows a pattern of the strip-shaped coating area 5b formed on the covering sheet on the second surface 3b side, the fluffing portion 6 formed on the covering sheet, and the protruding absorbing portion 3 of the absorbent body. . As shown in FIG. 7, in the fluff portion 6 formed on the covering sheet, the band-shaped coating area 5 b loses or reduces the fixing effect as described above, but the absorber concave portion 35, which is the effect of the fluff portion 6. As the raised fiber enters, the protruding absorption part 33 is prevented from being deformed due to deformation such as movement or swelling due to absorption, and it is difficult to inhibit movement and swelling, so it is flexible and difficult to lose shape and has good absorbability. Easy to obtain absorber. The portion 66 of the fluff portion 6 that overlaps with the protruding absorbent portion 33 is crushed in the thickness direction and has substantially the same thickness as the protruding absorbent portion 33 that does not overlap with the fluff portion 6, and an adhesive is disposed on the portion 66 of the fluff portion 6. In such a case, the fixing effect of the adhesive due to the decrease in thickness appears, so that the fixability of the absorbent body is maintained. In order to increase the effect of maintaining the shape by preventing the constituent materials of the individual protruding absorbing portions 33 from falling off and maintaining the shape by entering the concave portion 35 by the fluffing portion 6, the fluffing portion It is preferable that a coating area is formed between 6.

As a method for producing such an absorbent body, after forming a fiber partially by uneven processing on a nonwoven fabric under conditions of room temperature to about 100 ° C., a convex roll is rotated in the direction opposite to the direction of the nonwoven fabric as a fluffing treatment. The fluff portion can be partially formed by the uneven processing. An adhesive having a coating width is applied to the fluffed surface side of the nonwoven fabric after the fluffing treatment, and an absorbent body having a protruding absorbent portion 33 surrounded by the concave absorbent portion 34 is stacked on the adhesive coated surface side of the covering sheet, An absorbent body fixed with a covering sheet and an adhesive is obtained by passing under a given pressure between rolls having a flat surface with metal, cotton, rubber or the like.
In this way, the fluff portion 66 that overlaps the protruding absorption portion is formed with the fluff portion 6, which is inevitably contained in the recess 35 because the fluff is suppressed by the pressure during manufacture.
At the time of manufacturing the absorbent body, since the formation position and size of the fluff portion can be generally assumed by the convex shape of the fluff surface by uneven processing, an adhesive application position is arranged between the formation positions of the fluff portion 6. Therefore, an adhesive can be arranged so as not to overlap with the fluff. Further, if the coating area of the adhesive and the fluff portion 6 are arranged so as to be slightly overlapped, the adhesive can enter the fluff portion 6 to create a lower part of the adhesive force. It is possible to easily protect the overlapping position of the fluff portion 6, particularly the peripheral portion of the protruding absorption portion 33, with an adhesive and fiber fluff. As an adhesive coating method that easily exhibits such an effect, an indirect coating method in which an air flow is blown on a nonwoven fabric to travel the adhesive in a spiral shape or an omega shape is an It is preferable because it can move and easily disperse the adhesive inside the fluff.

In the absorbent body of the first and second embodiments, the flexibility of the absorbent core 3 and the shape recoverability and shape maintainability are compatible, and the liquid is quickly absorbed and retained without excessive liquid diffusion, and the liquid residue and liquid return are effective. From the standpoint of suppression, the ratio (%) of the depth (h ₂ ) of the recess 35 to the thickness of the absorber (thickness of the protruding absorber 33) (h ₁ ) (see FIG. 1) is 20 to 80%. It is preferable that it is 30 to 70%. In addition, although somewhat different depending on the application of the absorbent article to be used, the absorbent body gradually curves toward the skin contact surface with the recessed portion absorbent portion 34 as the base axis in the same manner as described above, along the shape of the wearer's body. From the viewpoint of encouraging deformation, the length k ₁ (see FIG. 2) in the longitudinal direction of the block-shaped protruding absorbing portion 33 is preferably 10 to 50 mm, and more preferably 15 to 30 mm. The width direction length k ₂ is preferably 5~30mm a view to alleviating the compressive force from the width direction of the recess is applied to the absorbent body during wear, 7～20Mm is more preferable. Moreover, 1-5 mm is preferable and, as for the longitudinal direction length s of the recessed part 35, 1-3 mm is more preferable. The width direction length r is preferably 1 to 5 mm, more preferably 1 to 3 mm.
The absorbent body of the present invention is not limited to the structure of the alignment arrangement of the protruding absorbent part 33 and the concave part absorbent part 34, and the low basis weight part with low density surrounds the high basis weight part with high density, and the skin contact surface side Any shape and arrangement can be adopted as long as the structure allows the liquid to quickly permeate and absorb and hold without liquid return or liquid residue. In that case, for the same purpose as the above dimensions, on the skin contact surface side of the absorbent body, the area of the low basis weight portion (q ₃ ) having a low density and the area (q ₄ ) of a high density basis portion having a high density The ratio (q ₃ / q ₄ ) is preferably 1/12 to 2/3, and more preferably 1/10 to 1/2.

For the same reason, average basis weight of the components of the recesses absorbing portion 34 _{(w 1)} is preferably 10 to 150 g / ^{m 2,} further preferably 20~140g / ^{m 2.} The average basis weight of the components of the projecting absorbing portion 33 _{(w 2)} is preferably 160~400g / ^{m 2,} further preferably 200~350g / ^{m 2.} Furthermore, the average basis weight ratio (w ₁ / w ₂ ) of the constituent members of both absorbers is preferably 0.01 to 0.90, and more preferably 0.10 to 0.70.

In addition, from the viewpoint of smooth liquid migration, the average density (m ₄ ) of the constituent members of the recess absorbing portion 34 is preferably 0.02 to 0.09 g / cm ³ , and 0.03 to 0.08 g / cm ³ is more preferred. On the other hand, in order to securely hold and fix the liquid, the average density (m ₅ ) of the constituent members of the protruding absorbent portion 33 is preferably 0.10 to 0.25 g / cm ³ , and preferably 0.10 to 0.20 g / cm ³ is more preferred. The protruding absorbing portion 33 is a portion that is densified by compression during manufacturing, but even if a uniform density is not formed in the thickness direction, the protruding absorbing portion 33 as a whole has a higher density than the recessed portion absorbing portion 34. well, the ratio of the average density of the average density _{(m 4)} and projecting absorbing portion 33 of the concave-absorbing portion _{34 (m 5) (m 4} / m 5) is preferably 0.80 or less, further 0.60 or less preferable. By setting the ratio (m ₄ / m ₅ ) to the upper limit or less, the liquid is temporarily held in the recessed portion absorbing portion 34 or the recessed portion 35, and the protruding absorbing portion is caused by the capillary force acting between the protruding absorbing portion 33. The absorption mechanism 33 sucks and holds the liquid efficiently is developed.

[Measurement of Thickness of Protrusion Absorbing Part 33 and Concave Absorbing Part 34 (and Concave Part 35)]
First, the recess 35 can be classified as a portion having a gap that is recessed from the bottom of the absorber toward the skin contact surface, and the recess absorption portion 34 can be classified as a portion made of the material of the absorber 3 located above the recess 35 (FIG. 1). ). The protruding absorption part 33 can be classified as a part from the upper part to the bottom part made of the material of the absorber 3 surrounded adjacent to the concave part 35 and the concave part absorption part 34 arranged in the thickness direction.
The measurement of the thickness (h ₃ = h ₁ −h ₂ ) (see FIG. 1) and the thickness (h ₁ ) (see FIG. 1) of the protrusion absorbing portion 33 is 37 mm. A non-contact type laser displacement meter (Laser head LK-G30, displacement meter LK-GD500 manufactured by KEYENCE) is used to place an acrylic plate with a thickness of 37 mm and a thickness of 3 mm on the absorber 3 (h ₁ ). , And the thickness (h ₃ ) of the recess absorbing portion 34 can be measured by using a microscope VHX-1000 manufactured by KEYENCE Corporation in a cross section corresponding to FIG.

[Measurement Method of Average Basis of Protrusion Absorbing Part 33 and Concave Absorbing Part 34]
Method of measuring the average basis weight of the projections absorbing portion 33 average basis weight of (w ₂₎ and the recesses absorbing portion 34 (w ₁₎ is an area of each of the sites measured previously measured, and cut out each part with a cutter The mass of the cut part is measured. The measured mass is divided by the area, and the average basis weight of each density region is measured. The average basis weight is obtained by adjusting 10 samples at an arbitrary position and averaging them.

[Measuring Method of Average Density of Protrusion Absorbing Part 33 and Concave Absorbing Part 34]
The density of the protrusion absorption part 33 and the recessed part absorption part 34 is a density which combined the pulp fiber which is a structural member of the absorber 3, and a super absorbent polymer. The absorber 3 is cut out at the boundary between the protruding absorbing portion 33 and the recessed portion absorbing portion 34, and these are cut into a size of 50 mm in length and 5 mm in width to prepare samples. Next, the mass of the sample is measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). Using a constant-pressure thickness meter, the sample thickness is measured, and the measured sample mass is divided by the volume of the sample (thickness × length × width) to calculate the density of all the materials in each region in each region. The measurement pressure of the low-pressure thickness gauge is 0.5 g / cm ² . The average density can be obtained by adjusting 10 samples at arbitrary locations and averaging them.

  The constituent material of the absorbent core 31 is not particularly limited, and a fiber material, a porous body, a combination thereof, or the like can be used. Examples of the fiber material include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins. Bisynthetic fibers containing two or more of them, and semisynthetic fibers such as acetate and rayon can be used. When using a fiber made of a synthetic fiber, the fiber may be a heat-shrinkable fiber whose shape changes due to heat. For example, the fineness is increased by heat but the fiber length is shortened, and the fineness is hardly changed by heat, but the length occupied by the apparent fiber is shortened by changing the shape to a coil shape. Also good. As the porous body, a sponge, a nonwoven fabric, an agglomerate of a water-absorbing polymer (aggregation of a highly water-absorbing polymer and a fiber), or the like can be used.

As the non-woven fabric forming the covering sheet, a material used for this type of article having a fixing portion in which fibers and fibers are fixed in some form can be arbitrarily adopted. For example, an air-through nonwoven fabric formed by carding and hot-air treated can be used. In particular, spunbonded nonwoven fabric and heat that has been partially embossed to prevent liquid core permeability, floatability, separation, etc. while maintaining high adhesive fixability even when wet. A roll nonwoven fabric is preferred.
In addition, from the viewpoint of fluff formation by fluff treatment, a spunbond nonwoven fabric formed from long fibers is preferable. In particular, SM (spunbond-meltblown) composite nonwoven fabric is a fiber standing at the boundary between the spunbond layer and the meltblown layer. Is preferable in that it is likely to occur. It is preferable to distribute the SM-based composite fiber particularly at the site on the back side of the absorbent article. When a non-woven fabric in which a spunbond layer such as SMS or SMMS is arranged on both sides is used, fluff formation and non-woven fabric strength are obtained. It is more preferable from the point of being easy.

  The absorbent body of the present invention can be applied to various absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, and incontinence liners. Moreover, the absorbent body of the present invention is also effective for urine, olimono, loose stool, menstrual blood and the like.

DESCRIPTION OF SYMBOLS 1 Absorbent body 2 Cover sheet 3 Absorbent core 33 Protruding absorption part 34 Recessed part absorbing part 35 Recessed part 4 Adhesive 5 (adhesive) strip-shaped coating area 6 Fluff

Claims (9)

An absorbent body comprising: an absorbent core; and a covering sheet covering the first surface and the second surface that are symmetrical surfaces of the absorbent core,
The covering sheet is made of non-woven fabric, the absorbent core has a high basis weight part and a low basis weight part having a lower basis weight, and a plurality of the high basis weight parts are arranged apart from each other. The low basis weight part is continuously arranged in the plane direction so as to surround the quantity part,
The high basis weight portion is thicker than the low basis weight portion, the low basis weight portion is unevenly distributed on the first surface side of the absorbent core, and a recess is disposed on the second surface side thereof, thereby The second surface side of the absorbent core has an uneven structure,
Wherein between the first and second surfaces of the absorbent core and said covering sheet, first surface and the second surface side to the cover sheet and the adhesive for bonding fix the high basis weight portion is applied There is a strip-shaped coating area , and the strip-shaped coating area is arranged in a shifted manner in plan view between the first surface side with the low basis weight portion and the second surface side with the concave portion. .   The absorbent core according to claim 1, wherein the absorbent core has pulp fibers, and the high basis weight part and the low basis weight part are integrated with each other without an interface. It said absorbent core has a pulp fiber and intake Osamusei polymer, wherein the high basis weight portion, the absorber of claim 1 or 2, wherein is sandwiched between the absorbent polymer is the pulp fibers.   The absorbent body according to any one of claims 1 to 3, wherein the covering sheet on the side facing the recess has a fluffed portion of fibers that enter the recess of the absorbent core. Absorber of the fuzz unit according to claim 4 Symbol mounting is divided by the band-shaped coating zone.   The plurality of strip-shaped coating areas to which the adhesive is applied are respectively disposed toward one direction in a plan view of the absorbent core, and the low basis weight portion has a three-intersection shape in a plan view. The absorber of any one of -5.   The absorber according to any one of claims 1 to 6, wherein each of the high basis weight portions of the absorbent core has a different planar shape.   The absorber according to any one of claims 1 to 7, wherein the high basis weight portion of the absorbent core has different planar shapes on the first surface side and the second surface side. The absorber according to any one of claims 1 to 8, wherein the high basis weight portions and the low basis weight portions are alternately arranged with respect to the arrangement direction of the belt-shaped coating area.

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