JP5792998B2 - Absorbent articles - Google Patents

Description

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

  In absorbent articles such as sanitary napkins, the material and structure of each member have been improved to improve its function and wearing feeling. Various types of absorbers have been proposed that have functionalities according to the usage conditions and the types of articles.

  For example, a napkin having a top sheet, a back sheet, and an absorber is disclosed in which a large number of compressed parts that are depressed from the back sheet side of the absorber are scattered (see Patent Document 1). The compressed portion and the uncompressed non-compressed portion gradually change in thickness to form continuous undulations, and a density gradient is formed from the non-compressed portion to the compressed portion. Thereby, the liquid guide | induced to the absorber from the surface sheet is drawn in quickly, and liquid return prevention property and anti-moisture property can be improved, implement | achieving sufficient absorption holding | maintenance amount of a liquid. Moreover, the absorbent article which has the absorber by which the high-density part and low-density part which are extended in the shape of a stripe in the vertical direction were divided alternately is indicated (refer to patent documents 2). With this absorbent body, the absorbent article promotes liquid diffusion in the longitudinal direction of the liquid, enhances the liquid drawability, and can be flexibly deformed by pressure from the width direction.

JP 2006-55352 A JP 2010-136899 A

  The present invention further enhances the absorption performance of the conventional absorbent article described above, further suppresses liquid residue and liquid return to the top sheet, making it less stuffy, and more body fluid excretion. It is an object of the present invention to provide an absorbent article that can be quickly dealt with occasionally and fits the wearer's body and has excellent flexibility to follow the movement well.

  The present invention relates to an absorbent article having a liquid-permeable surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorber disposed between the both sheets. The absorbent body has a high basis weight region and a low basis weight region having a basis weight relatively lower than the high basis weight region, and the low basis weight region is the high basis weight region. The surface sheet has a plurality of hook-shaped protrusions formed on the skin contact surface side, and is formed in a recess between the protrusions in plan view of the surface sheet. Solves the above problem by an absorbent article in which a portion having a small amount of fiber or an opening extending in the thickness direction of the surface sheet is formed.

  The absorbent article of the present invention more effectively suppresses liquid residue and liquid return to the surface sheet of body fluid, is less stuffy, responds quickly even when there is more body fluid excretion, and instant recovery of absorbency -It has an excellent effect that it can be held.

It is the partially notched perspective view which showed the sanitary napkin as one Embodiment of the absorbent article in this invention from the skin contact surface direction. It is the II-II sectional view shown in FIG. It is a perspective view which expands a part of surface sheet in the sanitary napkin of this embodiment, and is typically shown with a partial cross section. It is a figure which shows typically only the absorber which concerns on this embodiment, (A) is the top view which looked at the absorber from the skin contact surface side, (B) is the BB sectional view of (A). It is a figure and (C) is the top view which looked at the absorber from the non-skin contact surface side. It is the partial cross section figure which expanded and showed a part of predetermined cross section of the sanitary napkin shown in FIG. It is process explanatory drawing which outlines and shows the state before and after the press roll process at the time of manufacture about the preferable manufacturing method of the absorber which concerns on 1st Embodiment and 2nd Embodiment. (A-1) is a partially enlarged perspective view showing a pocket on the outer peripheral surface of the rotating drum, (a-2) is a cross-sectional view showing a state in which fiber material is deposited in the pocket of the rotating drum, (B) is explanatory drawing which shows a mode that an absorber precursor is mold-released from a rotating drum to a vacuum conveyor, (c) is explanatory drawing of a pressurization process. It is a perspective view which shows a part of deposit body (manufacturing intermediate body) from the convex-shaped part side.

  FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as a preferred embodiment of the absorbent article according to the present invention from the skin contact surface direction, and FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. is there. FIG. 3 is an enlarged perspective view of a part of the top sheet in the sanitary napkin of the present embodiment, schematically showing a partial cross-section. Moreover, FIG. 4 is a figure which shows typically only the absorber which concerns on this embodiment, (A) is the top view which looked at the absorber from the skin contact surface side, (B) is (A) It is BB sectional drawing, (C) is the top view which looked at the absorber from the non-skin contact surface side. In these drawings, the core wrap sheet of the absorber is omitted to avoid complexity.

First, an outline of the sanitary napkin 10 according to the present embodiment will be described.
As shown in FIG. 1, the sanitary napkin 10 according to this embodiment includes a liquid-permeable surface sheet 1 disposed on the skin contact surface side, and a back sheet 2 disposed on the non-skin contact surface side. , And an absorbent body 3 disposed between the two sheets, and has a substantially vertically long shape. The absorber 3 is bonded and disposed on the skin contact surface side of the back sheet 2 with an adhesive or the like. Further, on the skin contact surface side of the back sheet 2, the side sheet 4 is in contact with and joined to the back sheet 2 outside the left and right sides in the longitudinal direction of the absorber 3. The surface sheet 1 is sandwiched between the back sheet 2 and the side sheet 4 at the portion where the back sheet and the side sheet are in contact, and the top sheet 1 is further inward in the width direction (X direction) than the absorber 3. It arrange | positions so that it may be located in the skin contact surface side. The sheet members thus laminated are joined by heat sealing or the like outside the absorber 3 without the absorber 3 interposed therebetween, thereby forming the outer peripheral edge 6 of the napkin 10. The outer peripheral edge 6 is joined to such an extent that the overall stretchability is not hindered and the liquid once absorbed does not leak. A pocket (not shown) directed to the outer peripheral edge 6 is formed at the free end 41 of the side sheet 4 and has an effect of preventing lateral leakage of liquid or the like. In the present embodiment, wing portions 42 having side seats 4 extend outward in the width direction of the sanitary napkin 10 on both left and right sides of the sanitary napkin 10 in the width direction. The sanitary napkin 10 is fixed to the shorts by being wound around the non-skin contact surface side of the crotch.

  On the skin contact surface side of the sanitary napkin 10, a leak-proof groove 5 squeezed from the skin contact surface side of the top sheet 1 to the absorber 3 is provided. The plan view shape of the leak-proof groove 5 is such that, in the central portion in the longitudinal direction of the absorbent body 3, compressed portions having lengths in the longitudinal direction are arranged on the left and right sides in the width direction of the excretory part corresponding region such as menstrual blood. As the squeezed portion approaches the front and rear ends of the absorbent body 3, it gradually curves toward the center of the absorbent body 3, and the front end and the rear end coincide with each other. That is, the leak-proof groove 5 has a shape in which two compressed portions arranged on the skin contact surface side on both sides in the longitudinal direction of the sanitary napkin 10 in the plan view extend in the front-rear direction and are continuous in an endless ring shape. Yes (see FIG. 1). By doing in this way, the side leakage of the excretion liquid at the time of mounting | wearing and using a napkin can be prevented effectively. In addition, the excretion part corresponding | compatible area | region is the part which receives the excretion of body fluids, such as menstrual blood or a thing, and its vicinity. Moreover, the planar view shape of the leak-proof groove 5 in this embodiment is not limited to the above-mentioned shape, and may intersect with each other at the front end and the rear end of the endless annular shape, and is preferably determined appropriately according to the application.

  Details regarding the material, general size, and the like of the top sheet 1, the back sheet 2, the side sheet 4, and the absorber 3 will be described later. In this embodiment, the topsheet 1 quickly absorbs the excreted body fluid and delivers it to the absorber, and from the viewpoint of easy touch to the skin, the liquid permeability having protrusions made of fibers on the skin contact surface side Nonwoven fabric is used. Further, as the back sheet 2, a breathable moisture permeable film is used as a single layer. The absorbent body 3 is preferably formed by coating pulp fibers or the like and an absorbent polymer with a core wrap sheet (not shown) such as paper. Moreover, the adhesive (not shown) for fixing the sanitary napkin 10 to clothing is applied to the non-skin contact surface side of the back sheet 2. The sanitary napkin 10 is adhesively fixed to the user's clothes by the adhesive. The sanitary napkin 10 according to this embodiment is a line in which the top sheet side is directed to the wearer's skin contact surface side, the longitudinal direction is arranged from the lower abdomen to the buttocks, and the width direction is connected to the left and right feet. Arrange for the direction of and wear.

  In the present invention, unless otherwise specified, the surface that comes into contact with the wearer's body is referred to as the skin side surface or the skin contact surface or the surface, and the surface on the opposite side is the non-skin surface or the non-skin contact surface or the surface. It is called the back side. Of these two surfaces, the side close to the skin side or the extending direction is called the skin side, the skin contact surface side or the surface side, and the side close to the non-skin surface or the extending direction is the non-skin side, non-skin It is called the contact side or the back side. The direction positioned on the wearer's front side when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. The normal direction of the front or back surface of the absorbent article is called the thickness direction, and the amount is called thickness. Furthermore, in a plan view of the absorbent article, a direction from the abdominal side to the back side through the crotch is referred to as a longitudinal direction or a longitudinal direction, and a direction orthogonal to the longitudinal direction is referred to as a width direction. The vertical direction typically coincides with the front-rear direction of the wearer's body in the wearing state.

  In the sanitary napkin 10 of the present embodiment, the top sheet 1 has a plurality of hook-shaped protrusions 11 (hereinafter also referred to as hooks 11) formed on the skin contact surface side. The flange portion 11 is a region having a high basis weight of the topsheet 1, and a recess portion therebetween is a recess portion 12 having a low basis weight and a thin thickness. It is preferable that each of the flange portion 11 and the recess portion 12 extends in the longitudinal direction (Y direction), and a plurality of the two regions are alternately arranged in the width direction (X direction) (see FIGS. 2 and 3). ). The flange portion 11 and the recess portion 12 are formed by reducing the amount of constituent fibers on the skin contact surface side of the topsheet 1 at the recess portion 12, and include the flange portion 11 and the recess portion 12. The entire surface sheet 1 has a seamless integrated structure. Therefore, the topsheet 1 has a corrugated shape in which the thickness periodically changes on the skin contact surface side when viewed in the cross section in the width direction (X direction), and between the flange portion 11 and the recess portion 12. It is a relative height relationship (see FIGS. 2 and 3). The portion having the thinnest thickness located between the top portions 11a of the two flange portions 11 adjacent to each other in the width direction and the vicinity thereof are the recessed portions 12. If the boundary between the flange portion 11 and the recess portion 12 is defined, the position of the thickness approximately half of the apparent thickness at the top portion 11a of the flange portion 11 may be defined as the boundary portion between the flange portion 11 and the recess portion 12. it can. The collar part 11 and the hollow part 12 of the surface sheet 1 differ in the substantial basic weight by the fiber amount differing. Since the basis weight of the heel part 11 is relatively larger than that of the dent part 12, the heel part 11 protruding to the skin contact surface side is not easily crushed as a part that contacts the wearer's skin, and can be flexibly deformed. It becomes possible.

Furthermore, it is preferable that a large number of apertures 13 are intermittently arranged at predetermined intervals in the longitudinal direction at the bottom of the recess 12 (see FIG. 3). The opening 13 is preferably in the shape of a rectangle having a length in the longitudinal direction as shown in the figure, and can be formed by further dividing the constituent fibers of the topsheet 1. The opening 13 is not formed by pressure-bonding using thermal deformation of the fiber, and the inter-fiber distance of the constituent fibers is maintained and the rigidity is not increased. Is preferred. Moreover, in the opening part 13, since the liquid flow resistance by a fiber is the lowest part, naturally a liquid permeate | transmits easily and it can reduce a liquid residue. In addition, it is preferable that there is a density gradient that increases the fiber density from the top part 11a of the flange part 11 to the recessed part 12 and further to the end part of the opening part 13. As a result, the excretion liquid is more easily guided from the top portion 11 a to the opening portion 13. In addition, since the low basis weight depressions 12 are arranged in the longitudinal direction between the adjacent high basis weight flanges 11, it is easy to promote the diffusion of the liquid in the longitudinal direction and is effective in preventing the lateral leakage of the liquid. It is.
In the present invention, the opening 13 of the top sheet is not necessarily from the skin contact surface side of the top sheet 1 to the non-skin contact surface side as long as it has a function of reducing liquid flow resistance and increasing liquid permeation. The hole does not have to be completely fiber-free. For example, the opening 13 may be a portion having a lower fiber amount compared to the fiber amount of the hollow portion 12 formed by fiber pressing or the like, and a through hole and a portion having a reduced fiber amount are mixed. You may do.

On the other hand, the absorbent body 3 in the sanitary napkin 10 of the present embodiment includes the protruding absorbent portion 33 in the high basis weight region, the concave portion absorbent portion 34 in the low basis weight region having a relatively lower basis weight than the high basis weight region, and It has a recess 31 and is arranged in the plane direction so that the low basis weight region surrounds the high basis weight region. The configuration of the absorber 3 will be described in detail below.
There are a plurality of concave portions 31 extending along the width direction on the non-skin contact surface side of the absorbent body 3, and the concave portions 31 of the absorbent body 3 are also formed along the longitudinal direction of the absorbent body 3. That is, the non-skin contact surface side of the absorbent body 3 is formed by partitioning the region surrounded by the recess 31 as the protruding absorption portion 33. The protruding absorbing portions 33 of the present embodiment are arranged in the vertical and horizontal directions so as to have predetermined gaps s and r (see FIG. 4) with respect to each other in a natural state in plan view. In the present embodiment, the projecting and absorbing portions 33 have a checkered arrangement that matches the projecting and absorbing portions 33 that are adjacent to each other when the projecting and absorbing portions 33 are projected vertically and horizontally. That is, the projected images overlap in both directions when a large number of protruding absorbing portions 33 are projected in the longitudinal direction and the width direction. In addition, the arrangement can be appropriately selected according to the use and function, and is not particularly limited. For example, the arrangement is a staggered arrangement (the above-mentioned projected image is arranged with a substantially half-pitch shift in the longitudinal direction and / or the width direction). May be. Although this protrusion absorption part 33 is substantially rectangular shape long in a longitudinal direction in planar view, this shape is not specifically limited in this invention, The thing of arbitrary shapes is employable. In the present embodiment, the protruding absorbent portion 33 is composed of pulp fibers and a superabsorbent polymer, and the outline thereof may not be a regular shape as shown in the figure, and the three-dimensional shape described above as a whole. It is preferable that 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. By dividing the absorbent body 3 by the vertical and horizontal concave portions 31 as described above, the portion becomes a flexible portion, and the “body compatibility” in which the sanitary napkin 10 fits the undulation of the skin surface, and the movement of the wearer In addition, the “trackability” that prevents the occurrence of a partial gap with respect to the skin with good tracking is extremely high.

  On the skin surface side of the concave portion 31 of the absorbent body 3 in the present embodiment, a concave portion absorbent portion 34 that is a region thinner than the protruding absorbent portion 33 is disposed as a part of the absorbent body 3. The basis weight of the region Q (FIG. 2) of the absorbent body where the recessed portion absorbent portion 34 is disposed is smaller than the region P (FIG. 2) of the absorbent body 3 where the protruding absorbent portion 33 is disposed. Moreover, although the detailed manufacturing method of the absorber 3 is mentioned later, it is preferable that the protrusion absorption part 33 in this embodiment is relatively higher-density than the recessed part absorption part 34. FIG. That is, the absorbent body 3 of this embodiment includes a high-basis-weight and high-density protruding absorbent portion 33 and a high-basis-weight and high-density protruding absorbent portion 33 that has a relatively low basis weight and a low-density recessed portion absorbent portion 34. It is preferable that the high-basis-weight and high-density protruding absorbing portion 33 is formed by being surrounded and partitioned by the low-basis-weight and low-density recessed portion absorbing portion 34 in a plan view. In addition, the recessed part absorption part 34 and the part by the side of the skin contact surface of the protrusion absorption part 33 are continued in the plane direction, and the skin-like part by the side of the skin contact surface of the absorber 3 is formed. The entire absorbent body 3 including the recessed portion absorbing portion 34 and the protruding absorbing portion 33 has a seamless integrated structure.

  The absorbent body 3 of the present embodiment has a low fiber density in the recessed portion absorbing portion 34 and a low thickness, resulting in low liquid flow resistance. In other words, the liquid that has reached the skin contact surface side of the absorbent body 3 is a recess having a low liquid flow resistance that is adjacent to the non-skin side surface of the topsheet 1 in the thickness direction and forms a thin skin portion on the skin surface side of the absorbent body 3. That is, it is preferentially absorbed from the absorption part 34. Therefore, in the sanitary napkin 10 of the present embodiment, a liquid introduction path is formed that connects the recessed portion 12 of the topsheet 1, particularly the opening portion 13, to the recessed portion absorbing portion 34 adjacent thereto in the thickness direction. The liquid is quickly permeated while maintaining the momentum (kinetic energy) and potential energy at the time of excretion held by the liquid flow path in which the surface sheet 1 and the absorber 3 are linked, and the liquid remains on the skin surface of the surface sheet. Is unlikely to occur. In the absorber 3, the recessed portion absorbing portion 34 functions as a chamber that quickly draws the liquid from the topsheet 1 into the absorber 3. The liquid that has passed through the recess absorbing portion 34 is quickly taken into the protruding absorbing portion 33 by the capillary force generated by the fiber density gradient (or density difference) between the recess absorbing portion 34 and the protruding absorbing portion 33 and drawn in the thickness direction. Held. On the other hand, when a highly viscous liquid such as menstrual blood is excreted in large quantities or repeatedly excreted at a time, even if it cannot be absorbed and retained by the projecting absorbent part 33 at a time, the recessed part absorbent part 34 is quickly drawn into the recessed part 31. It also acts as a buffer that temporarily holds the liquid, and also serves as a diffusion action that prevents the liquid from being retained in the boundary region between the high density portion and the low density portion. In addition, as described above, the concave portion 31 is connected on the non-skin contact surface side of the absorbent body 3, so that the liquid is moved at a position farther than the top sheet 1 and reliably absorbed and held by each protruding absorbent portion 33. Can be made. As described above, the liquid passing structure including the recessed portion absorbing portion 34 and the recessed portion 31 allows the liquid to be quickly taken into the absorbent body 3 from the surface sheet 1 side and reliably absorbed and held by the protruding absorbing portion 33. Thus, liquid remaining on the skin contact surface side of the absorbent body 3 is suppressed, and liquid return from the interior of the absorbent body 3 to the top sheet 1 is unlikely to occur.

  From the viewpoint of the capillary force when the liquid is transferred between the top sheet 1 and the absorbent body 3, the higher the density of the absorbent body in contact with the top sheet, the stronger the absorbing power and holding power, It is thought that it is suitable for absorbing water. However, when a large amount of bodily fluid is excreted at a high density only, the absorption rate of the absorber cannot catch up with the excretion rate of the bodily fluid, so that it is inevitable that liquid return occurs. In the present embodiment, by providing a plurality of ridges 11 and depressions 12 between them on the skin contact surface side of the surface sheet 1, the above-mentioned large amount of liquid quickly spreads over the entire surface sheet 1 and is averaged. Is done. At the same time, the liquid is handed over in the non-skin contact side direction from the opening 13 of the recess 12 and is transmitted from the top sheet 1 to the recess absorption part 34 of the absorbent body 3 without resistance to liquid passage. The liquid that has reached the recess absorbing portion 34 is immediately absorbed and held by the protruding absorbing portion thereafter. Thus, the sanitary napkin 10 can realize the prevention of liquid residue and liquid return, the improvement of dry feeling, and the comfort of the wearer by the interaction between the configuration of the topsheet 1 and the configuration of the absorbent body 3. .

  In addition, due to the liquid passing structure composed of the recess absorbing portion 34 and the recess 31, excretion fluid such as menstrual blood flows to the topsheet 1 side even if there is pressure in the thickness direction when seated on the napkin 10. It becomes difficult to return. This is because the recessed portion absorbing portion 34 quickly draws into the recessed portion 31 without retaining the liquid, the liquid retaining property of the protruding absorbent portion 33 having a high fiber density is high, and the non-exhaustability of the absorbent body 3 with the storage structure having the recessed portion 31. Since the liquid is also moved on the skin contact surface side to be absorbed and held by the protruding absorbing portion 33, it is caused by a plurality of actions such as the amount of storage of the recessed portion 31 itself does not increase. Further, it is considered that one of the factors is that the pressure applied to the concave portion 31 is eased by the presence of the concave portion absorbing portion 34 and the movement of the liquid in the concave portion 31 is promoted by this pressure. Thus, the liquid 3 is quickly drawn into the recess 31 without leaving the liquid on the surface sheet 1 side of the absorber 3, so that the return of the liquid to the surface sheet 1 side is effectively suppressed even in the thickness direction pressure, and a dry feeling is achieved. Enhanced.

  Here, the characteristics of the dynamic interaction between the partitioned absorbent body 3 and the topsheet 1 in the sanitary napkin 10 of the present embodiment will be described in detail with reference to FIG. FIG. 5 is an enlarged partial cross-sectional view showing a part of a predetermined cross section of the sanitary napkin shown in FIG. In addition, in order to avoid complication of the figure, the back sheet 2 and the side sheet 4 are not shown, and the shape of the top sheet 1 is schematically shown. In the practice of the present invention, the shape is not necessarily the same as the illustrated shape. It is not limited to things.

In the sanitary napkin 10 according to the present embodiment, the above-described opening 13 and recessed portion absorbing portion 34 are arranged substantially in the thickness direction at the center position in the width direction in a plan view including the excretory portion corresponding region (FIG. 5). When such liquid waste a ₁ from the body to the sanitary napkin 10 which is the arrangement is excreted in recess 12 of the top sheet 1, the amount of fibers to the ridge portion 11 is relatively small amount of liquid The liquid flow resistance is low, and the excretory liquid can be quickly drawn into the absorber 3 side. Further, naturally, the liquid easily passes through the opening 13. Therefore, the liquid is transferred from the top part 11a of the flange part 11 to the hollow part 12 due to the gradient of the fiber density, and the liquid collected in the hollow part 12 is transferred to the absorber 3 side by the opening part 13. A liquid passage is formed. That is, even if the amount of liquid is small, it is guided to the absorber 3 and is effectively transmitted to the absorber 3 side. In addition, since the skin contact surface side of the absorbent body 3 is a flat shape, the top sheet 1 and the absorbent body 3 are easily in contact with each other, and the excretory fluid a ₁ that has passed through the top sheet ₁ is in the absorbent body 3 in a wide range. Easy to be guided. On the other hand, the absorber 3 has the some recessed part 31 in the non-skin contact surface side as mentioned above, and the recessed part absorption part 34 is distribute | arranged to the skin contact surface side. The excreted liquid a ₁ is quickly transmitted in the thickness direction of the absorbent body 3 using the recessed portion absorbing portion 34 having a low flow resistance as a chamber. Then, the excretory liquid a ₁ that has moved in the thickness direction of the absorber 3 becomes a transition liquid a ₂ that is partly directed to the peripheral protruding absorption part 33, and the other part is the storage liquid a ₃ that is taken into the recess 31. Become. Thus, drawn in the liquid is concave absorbing portion 34 that is transmitted from the surface sheet 1, a ₂ and by being dispersed into a _3, it is not liquid passing resistance reduces the amount retained on the surface side of the absorbent body It will be even lower. Thereby, the liquid return to the surface sheet 1 can also be suppressed effectively.

  As described above, the sanitary napkin 10 according to the present embodiment sufficiently exhibits the performance of the top sheet 1 having high liquid permeability in the thickness direction due to the high liquid permeability in the thickness direction of the absorber 3. It is possible to suppress the liquid return of the moisture taken in to the skin, thereby providing the user with a suitable dry feeling. In addition, in the implementation of this invention, it does not necessarily correspond in the positional relationship in the thickness direction of the opening part 13 of the surface sheet 1, and the recessed part absorption part 34 of the absorber 3. FIG.

Moreover, it is preferable that a water-absorbing polymer is present inside the absorber 3 of the present embodiment. In order to suppress the above-described liquid return more effectively, it is preferable that the water-absorbing polymer is arranged more biased in the portion of the protruding absorbent portion 33 than in the recessed portion absorbent portion 34. It is more preferable that the protrusion absorbing portion 33 is arranged with a large bias toward the non-skin surface side. It is also preferable from the same viewpoint to dispose a water-absorbing polymer on the non-skin surface side of the recess 31.
Furthermore, in the absorbent body 3 of the present embodiment, it is preferable that the liquid passage structure having the recess 31 extends to the outer portion in the width direction of the leakage preventing groove 5. With this arrangement, the product bending rigidity with the width direction of the product as the axis is reduced, it becomes easy to deform according to the curve of the wearer's body from the crotch to the buttocks, and also on both sides of the absorbent body 3 where side leakage is likely to occur. Flexibility can be imparted to fit the wearer's crotch, and a gap can be prevented from following the movement of the wearer's body.

In the sanitary napkin 10 of the present embodiment, the groove portions of the leak-proof groove 5 at both ends in the width direction of the excretory part corresponding region include the plurality of protruding absorbing parts 33 and the recessed part absorbing parts 34 at the positions. It is preferable to be arranged over the longitudinal direction (Y direction) of the article. In this way, when the napkin 10 is worn, the shape of the protruding absorbing portions 34 is prevented from being deformed by shearing near the wearer's foot, and liquid leakage from the width direction can be suppressed. Further, when the napkin 10 is mounted, the leak-proof groove 5 becomes a bent portion and easily fits to the wearer's body, and an unnecessary load is hardly applied to the protruding absorbent portion 33 at the central portion in the width direction of the absorbent body 3. As a result, the shape of the protruding absorbing portion 33 that holds a large amount of liquid in the central portion in the width direction is not easily broken, and liquid leakage can be further prevented. Moreover, it is preferable that the recessed part 31 is extended and arranged to the part of the width direction outer side of the groove | channel 7. With this arrangement, the product bending rigidity with the width direction of the product as the axis is reduced, it becomes easy to deform according to the curve of the wearer's body from the crotch to the buttocks, and also on both sides of the absorbent body 3 where side leakage is likely to occur. Flexibility can be imparted to fit the wearer's crotch, and a gap can be prevented from following the movement of the wearer's body.
The groove portion of the leakage preventing groove 5 is formed by compressing the topsheet 1 and the absorber 3 from the topsheet 1 side after the topsheet 1 and the absorber 3 are bonded together. Therefore, it is preferable that at least a part of the leak-proof groove 5 overlaps the recessed portion 12 of the topsheet 1 so that the texture is not hard compared with the peripheral portion and the wearer does not feel uncomfortable. By this arrangement, the skin positively hits the ridge 11 of the topsheet 1, so that it is possible to prevent the skin-like dent 12 and the skin from directly hitting, and a good wearing feeling can be given to the wearer.

  The apparent thickness of the collar portion 11 in the present embodiment is preferably 0.1 to 5.0 mm, and more preferably 0.3 to 3.0 mm, in order to improve the feel of the topsheet 1. The height difference between the ridge 11 and the dent 12 when viewed on the skin side of the top sheet 1 increases the cushioning and breathability of the top sheet 1 and controls the diffusion of the liquid. 0.0 mm is preferable, and 0.2 to 2.0 mm is more preferable.

The size and shape of the protruding absorbent portion 33 and the recessed portion 31 in the present embodiment are not particularly limited, and vary slightly depending on the application of the absorbent article to be used, but the longitudinal length k _{1 of the} protruding absorbent portion 33 (see FIG. 4). Is preferably 10 to 30 mm, more preferably 15 to 25 mm, from the viewpoint of gradually curving the absorbent body gradually toward the skin contact surface with the concave portion as a base axis, and promoting deformation along the shape of the wearer's body. . The width direction length _{k 2} is preferably 5~20mm a view to alleviating the compressive force from the width direction of the recess 31 is applied to the absorbent body during wear, 7 to 15 mm is more preferable. Moreover, 1-5 mm is preferable and, as for the longitudinal direction length s of the recessed part 31, 1-3 mm is more preferable. The width direction length r is preferably 1 to 5 mm, more preferably 1 to 3 mm.

Further, as described above, the recessed portion absorbing portion 34 suppresses the amount of liquid retained and quickly moves the liquid to the recessed portion 31, and the recessed portion 31 has a function of temporarily storing excretory liquid and does not reverse the liquid to the topsheet 1 side. Therefore, the ratio (%) (see FIG. 2) of the depth (h ₂ ) of the concave portion 31 to the thickness of the absorber 3 (thickness of the protruding absorbing portion 33) (h ₁ ) is 20 to 80%. Preferably, it is 30 to 70%. By setting it to the above lower limit or more, liquid residue and liquid return to the topsheet can be more effectively suppressed, and by setting it to the upper limit or less, the liquid received from the topsheet is not excessively spread to the protrusion absorbing portion 33. And can be moved. For the same reason, the material basis weight region has a recess absorbing portion 34 and the recess 31 Q (see FIG. 2) _{(w 1)} is preferably ^{10~150g / m 2, 20~140g / m} 2 More preferably. Regions have protruding absorbing portion 33 P basis weight (see FIG. 2) _{(w 2)} is preferably 160~400g / ^{m 2,} further preferably 200~350g / ^{m 2.} Further, the basis weight ratio (w ₁ / w ₂ ) of both is preferably 0.01 to 0.90, and more preferably 0.10 to 0.70.

  In the present invention, the concave portion 31 is a portion that is recessed from the bottom of the absorbent body 3 to the skin contact surface side to form a gap. The recessed portion absorbing portion 34 is a region of the absorber 3 positioned above the recessed portion 31 in the thickness direction, and is a region r in the width direction and s in the longitudinal direction in plan view (see FIG. 4). The protruding absorbing portion 33 is a portion indicated by a two-dot chain line in the drawing of a region P adjacent to the region Q of the concave portion 31 and the concave portion absorbing portion 34 arranged in the thickness direction and from the top to the bottom of the absorber surrounded by the region Q. Yes (see FIG. 2 and FIG. 5). In addition, each area | region of the recessed part absorption part 34 shown in the figure and the protrusion absorption part 33 does not need to be actually divided as shown in figure, The range can be suitably determined by the purpose to use. preferable.

Measurement of the thickness (h ₃ ) of the recess absorbing portion 34 and the thickness (h ₁ ) of the protruding absorbing portion 33 described above is performed by placing an acrylic plate having a size of 37 mm × 37 mm and a thickness of 3 mm on the absorbent core 10 and KEYENCE Corporation. Using a non-contact type laser displacement meter (laser head LK-G30, displacement meter LK-GD500) manufactured, the thickness (h ₁ ) of the protrusion absorbing portion 33 including the upper portion 33a is measured, and the thickness (h ₃ ) of the recessed portion absorbing portion 34 is measured. The cross section corresponding to FIG. 2 of the absorber was measured by using a microscope VHX-1000 manufactured by KEYENCE.
The method of measuring the basis weight of the recesses absorbing portion 34 basis weight of _{(w 1)} and projecting absorbing portion 33 _{(w 2)} is pressed against FEATHER Co. razor (Feather razor S single-edged), recesses absorption of the recess 34 is cut out and weighed and divided by the area of the cut out portion, and similarly, the protruding absorbent part 33 including the upper portion 33a is cut out, and the weight is measured and divided by the cut out area of the basis weight. Was calculated.

  The thickness and height difference of the collar part 11 and the hollow part 12 are measured by magnifying and observing the cross section of the topsheet 1 50 to 200 times using a microscope VH-8000 (manufactured by Keyence Corporation). The cross section can be obtained by cutting the cross section of the topsheet 1 using a feather razor (part number FAS-10, manufactured by Feather Safety Razor Co., Ltd.).

  The surface sheet 1 in the present embodiment is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing excreted bodily fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The topsheet 1 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used. Such a top sheet 1 of this embodiment can be manufactured using the fluid entanglement method which sprays the fluid of Unexamined-Japanese-Patent No. 2010-106430, and divides | segments a fiber, for example.

  In the present invention, the opening 13 can adopt various shapes, and the number of arrangement and the arrangement interval in the longitudinal direction can be arbitrarily set. For example, the shape may be a rhombus, a square, a triangle, an ellipse, or a symbol such as a heart shape. The opening 13 may not be a complete hole but may be a part having an extremely small amount of fibers, and the recess 12 may be configured without the opening 13. The collar portion 11 has a shape that is continuous in the longitudinal direction, but may be a shape that is divided into a plurality of pieces and small ridge blocks are intermittently arranged in the longitudinal direction. In this case, since the flexibility in the width direction is further improved, it is preferable from the viewpoint of fit at the time of use and easy folding at the time of individual packaging. In the present invention, the shape of the ridge portion 11 and the dent portion 12 is, for example, a shape in which ridges and dents are alternately arranged on the non-skin contact surface side as well as the non-skin contact surface side. A shape having undulations on the contact surface side may also be used. The top sheet 1 is not limited to a single layer, and may have a multilayer structure of two or more layers, such as a sheet having the above-described flange portion 11 and the depression portion 12 as an upper layer and another sheet disposed as a lower layer. . In this case, considering that the absorbed liquid does not return to the skin, it is preferable to arrange at least the lower layer part in the excretory part corresponding region. In the case of a two-layer structure (not shown), it is preferable to increase the capillary gradient of the lower layer compared to the upper layer because of the drawability of the liquid. As a method of increasing the capillary gradient, for example, a method of reducing the fiber diameter of the lower layer fibers than the upper layer can be mentioned. In this case, it is preferable that the upper layer fibers are 2.0 to 10.0 dtex and the lower layer fibers are 1.0 to 8.0 dtex. The capillary gradient can also be increased by increasing the hydrophilicity of the lower layer than the upper layer. Or you may employ | adopt both of these means.

  The side sheet 4 is preferably a water-repellent nonwoven fabric, and is water-repellent from a nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric, heat roll nonwoven fabric, needle punch nonwoven fabric, etc. manufactured by the card method. Various non-woven fabrics can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or the like is used.

Next, the preferable manufacturing method of the absorber 3 used by this embodiment is demonstrated with reference to FIGS. In addition, the shape of the absorber 3, the number, shape, arrangement | positioning, etc. of the recessed part 31 and the protrusion absorption part 33 are shown in figure.
FIG. 6 is a diagram showing an absorbent body manufacturing apparatus 60 preferably used for manufacturing the absorbent body 3 of the sanitary napkin 10. The manufacturing apparatus 60 includes a rotating drum 62 (see FIG. 7A-1) having a stacking plate in which a plurality of pockets 9 (deposition portions) are further divided in an outer peripheral surface, and an outer peripheral surface of the rotating drum 62. For this purpose, a duct 63 for supplying the fiber material S in a scattered state, a fiber material supply unit 64 for supplying the fiber material S to the duct 63, and an excessive amount of fiber material deposited so as to overflow the pocket 9 are scraped. A scuffing roll 65 to be taken, a coating mechanism (not shown) for covering the upper and lower surfaces of the deposit (absorber precursor) 70 released from the pocket 9 with the core wrap sheet 3b, and the absorber precursor 70 to the core wrap sheet The absorber continuous body obtained by coating with 3b is compressed between a pair of press rolls 66a and 66b and compressed, and the compressed absorber continuous body is used for each sanitary napkin. Cut into dimensions A cutting device (not shown) serving as the absorber 3 after processing is provided.

  The rotary drum 62 has a cylindrical shape and is driven to rotate at a constant speed in the direction of arrow A in FIG. An intake fan (not shown) is connected to a non-rotating portion inside the rotating drum 62 (on the rotating shaft side), and the partitioned spaces B and E inside the rotating drum are negatively driven by driving the intake fan. Maintained at pressure. A mesh plate (not shown) is disposed on the bottom surface of each pocket 9 on the outer peripheral surface and has a large number of pores. While each pocket 9 passes over the spaces B and E maintained at negative pressure, the pores at the bottom of each pocket 9 function as suction holes.

  The duct 63 has a blowing end portion 63 a that covers a part of the outer peripheral surface of the rotating drum 62, and a blowing end portion 63 b connected to the fiber material supply device 64. The duct 63 has a pocket 9 located on the space B. An air flow flowing toward the outer peripheral surface of the rotary drum 62 is generated in the duct 63 by suction from the bottom surface. The fiber material supply unit 64 includes a defibrating machine 64e, and the raw material S ′ in the lattice 64d is defibrated by the defibrating machine 64e, and the defibrated fiber material S is supplied into the duct 63. Yes.

  The scuffing roll 65 has a brush around it, and scrapes off the fiber material S overflowing from the pocket 62 by the brush. The deposit (absorber precursor) 70 that is not scraped off by the scuffing roll 65 and remains in the pocket 9 is released from the pocket 9 below the rotary drum 62. The mold release from the pocket 9 maintains the partitioned space D in the rotary drum 62 at a positive pressure by a pressurizing means (not shown), and blows out air from the pores on the bottom surface of the pocket 9, and the vacuum conveyor 67. This is done by suction from the side. The covering mechanism includes a well-known transport mechanism for supplying the core wrap sheet 3b on the vacuum conveyor 67, and a deposit (absorber precursor) 70 placed on the core wrap sheet. Both sides are folded on the deposit (absorber precursor) 70, and the upper and lower surfaces of the deposit (absorber precursor) 70 are covered with the core wrap sheet 3b by the folding. In FIG. 6, the details of the folding process are omitted, and the folded core wrap sheet 3b is simply shown as two lines.

A method of manufacturing the above-described absorber 3 using the absorber manufacturing apparatus 60 shown in FIG. 6 will be described.
First, the rotating drum 62 and the scuffing roll 65 are rotated, and the intake fan and the pressurizing unit are operated to make the spaces B and E have a negative pressure and the space D have a positive pressure. Further, the vacuum conveyor 67, the compression device 66, and the cutting device are operated. By the operation of the intake fan, a suction force is generated at the bottom surface portion of the pocket 9 located on the space B, and an air flow that flows toward the outer peripheral surface of the rotary drum 62 is generated in the duct 63. Then, when the fiber material supply device 64 is operated to supply the fiber material S (pulp fiber 41 and the superabsorbent polymer 42) into the duct 63, the fiber material S is in a scattered state, and the inside of the duct 63 is discharged. It is placed on the flowing air stream and supplied toward the outer peripheral surface of the rotating drum 62.

While each pocket 9 passes over the space B maintained at a negative pressure, the fiber material S supplied from the duct 63 is sucked and accumulated in each pocket 9 (FIG. 7 (a-1) and (See (a-2)). This point will be described with reference to FIG. 7 (a-2). In the stacking plate on the outer peripheral surface of the rotary drum 62, a plurality of partitions 91 are further divided so that a mixture of pulp fibers and water-absorbing polymer is stacked. Further, the fibers are stacked up to the height of the rotary drum 62 beyond the height of the partition 91. A slightly excessive amount of fiber material is deposited in each pocket 9, and the fiber material overflowing from the pocket 9 is scraped off by the scuffing roll 65. The deposit (absorber precursor) 70 which is not scraped off by the scuffing roll 65 and remains in the pocket 9 is released onto the core wrap sheet 3b supplied on the vacuum conveyor 67 (see FIG. 7B). . FIG. 8 is a view showing the (absorber precursor) 70 released from the core wrap sheet. The deposited body (absorber precursor) 70 corresponds to the plurality of grooves 9 a in the pocket 9. A plurality of convex portions 33A are formed. Of the absorber precursor 70, the portion deposited on the partition 91 becomes the recess absorption portion 34 of the absorber 3, and the portion where the partition 91 is arranged becomes the recess 31 of the absorber 3.
In the deposited body (absorber precursor) 70 on the core wrap sheet, the surface having the convex portion 33A is also covered by both sides of the folded core wrap sheet 3b, and then the entire body 70 of the absorbent body is reversed by the belt conveyor. Then, the front and back sides are introduced into the compression device 6 and pressurized between the pair of press rolls 66a and 66b (see FIG. 7C). Thereby, the convex portion 33A is crushed and crushed, and becomes a high-density portion. The absorbent body continuous body after the convex portion 33A is crushed is cut by a cutting means (not shown) to become the absorbent body 3 having a size used for each sanitary napkin. In the obtained absorbent body 3, the portion formed by condensing the convex portion 33 </ b> A of the entire absorbent body body 70 becomes a block-shaped protruding absorbent portion 33 as a high-density high basis weight portion.
The sanitary napkin 10 disposes the absorbent body 3 thus obtained intermittently between the belt-shaped original fabric of the top sheet 1 and the belt-shaped raw fabric of the back sheet 2, and then around the absorber 3. It is obtained by joining the front and back sheets and then cutting to the size of the individual sanitary napkin.

As mentioned above, although 1 embodiment of the absorber of this invention, its manufacturing method, and an absorbent article was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the high density part and the low density part may be formed only in a part in the longitudinal direction of the absorber. For example, it may be formed only on the liquid excretion part facing part of the absorber, may be formed only on the front part and the liquid excretion part facing part, or formed only on the rear part and the liquid excretion part facing part. Also good.

  Although there is no restriction | limiting in particular as a constituent material of the absorber 3, A fiber material, a porous body, those combinations, etc. 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, heat may increase the fineness but shorten the fiber length, or the fineness may hardly change, but the shape may change to a coil shape and the length occupied by the apparent fiber may be shortened. . As the porous body, sponge, non-woven fabric, aggregate of superabsorbent polymer (aggregate of superabsorbent polymer and fiber) and the like can be used.

The back sheet 2 may be a moisture permeable film alone, a laminate of a film and a nonwoven fabric, or a water-repellent nonwoven fabric (such as SMS or SMMS). It is most preferable to use a moisture permeable film alone as a leak-proof material from the viewpoint of cost and matching with an anti-displacement adhesive. As the film material in this case, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler that is not compatible with the thermoplastic resin and extruding the film to a predetermined size to make fine holes, or essentially moisture The non-porous film which is highly compatible and can discharge water vapor, such as a permeable membrane. In order to realize a leak-proof layer that sufficiently exhibits the performance of moisture discharge related to the present invention and does not ooze out moisture, the moisture permeability should be in the range of 0.7 to 3.0 g / 100 cm ² hr. Is preferable, and it is still more preferable that it exists in the range of 1.0-2.5. From the standpoint of sufficiently improving the smoothness, it is most preferably from 1.5 to 2.5. Moreover, in order to be able to use without trouble, such as a tear of a film, a film basic weight is 18-70 g / m < ² >, More preferably, it is 25-60 g / m < ² >. Moreover, a preferable inorganic filler compounding quantity is 30-65 mass% as a mass% of the filler with respect to the mass of the whole film, More preferably, it is 40-60 mass%.

  The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and the present invention can be applied to this type of sanitary napkin, for example, an incontinence pad, an incontinence liner, and the like. Moreover, it is effective not only for menstrual blood but also urine, orimono, loose stool, and the like. In addition to the top sheet 1, the absorber 3, the back sheet 2, and the side sheet 4, members may be appropriately incorporated in accordance with applications and functions. In addition, the material of the top sheet 1, the absorbent body 3 and the back sheet 2 of the sanitary napkin of the above embodiment, the conditions in the manufacturing method, and the dimensional terms of the product are not particularly limited, and are used in ordinary sanitary napkins and the like. Various materials can be used.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not construed as being limited thereto.

[Example 1]
A sanitary napkin having the structure shown in FIG. 1 was prepared according to a conventional method, and this was used as a sample of Example 1. The detail of the manufacturing method of a surface sheet and an absorber is as follows.

(1) Manufacture of surface sheet (surface sheet in the first embodiment) Using a 4.4 dtex × 51 mm core-sheath structure fiber of sheath component polyethylene / core component polyester, forming a nonwoven fabric by steam flow according to the method for manufacturing a surface sheet described above To obtain a 40 g / m ² surface sheet having the above-described grooved structure and openings. The obtained surface sheet had a width of the collar part of 3 mm, a width of the recess part of 2 mm, and a thickness (apparent thickness at the top part of the collar part) of 1.2 mm. The thickness was adjusted to 0.7 mm by inserting and compressing between the pressed rolls. The recessed portion of the top sheet has an elliptical opening having substantially the same width as the recessed portion, and the opening ratio after compression was 8%.

(2) using the apparatus shown in manufacturing drawing 6 of the absorbent body, fiber stacking a basis weight of 200 g / m ^2, a basis weight of 52 g / m ² of the recesses absorbing portion pulp fibers and superabsorbent polymer projecting absorber Got the body. This fiber stack was covered with a core wrap sheet, passed between a pair of press rolls, and compressed with a pressure of 3.0 kgf / cm ² to obtain an absorbent body. In this absorbent body, the average density (m ₅ ) of the protruding absorbent part was 0.12 g / cm ³ , and the average density (m ₄ ) of the recessed part absorbent part was 0.08 g / cm ³ . The average basis weight (w ₂ ) of the high density region 38 was 240 g / m ² , and the average basis weight (w ₁ ) of the low density region 39 was 100 g / m ² . In addition, the thickness (h ₃ ) of the recess absorbing portion 34 was 1.2 mm, and the thickness (h ₁ ) of the protruding absorbing portion 33 was 2.0 mm. Vertical length _{k 1} is 20mm width direction length _{k 2} of the projecting absorbing portion 33 is 10 mm, the longitudinal length s is widthwise length r is 2.0mm in the recess 31 at 1.0mm there were.

[Comparative Example 1]
A sanitary napkin was prepared in the same manner as in Example 1 except that the surface sheet shown below was used, and this was used as Comparative Example 1.
As a surface sheet of Comparative Example 1, a card web having a basis weight of 40 g / m ² was manufactured by a card method using 4.4 dtex × 51 mm core-sheath structure fiber of sheath component polyethylene / core component polyester. A hot air of 138 ° C. ± 5 ° C. was passed through the card web for 10 seconds by an air-through method, and the intersection between the fibers was thermally fused to form a nonwoven fabric. The thickness of the obtained surface sheet was 1.2 mm.

[Comparative Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorber shown below was used, and this was used as Comparative Example 2.
As an absorber of comparative example 2, a high basis weight region and a low basis weight region are not provided in the absorber, and a water-absorbing polymer having a basis weight of 50 g / m ² is uniform with respect to an absorbent pulp having a basis weight of 200 g / m ^2. A mixed fiber was obtained. The fiber stack was passed between a pair of press rolls and compressed with a pressure of 3.0 kgf / cm ² to obtain an absorbent body. The thickness of the obtained absorber was 2.0 mm.

[Performance evaluation]
About the sample (sanitary napkin) of an Example and a comparative example, the surface layer liquid return amount was measured with the following method. The results are shown in Table 1 below.

<Surface liquid return amount>
A method for measuring the surface liquid return amount will be described below. The surface layer liquid return amount indicates how much the liquid absorbed by the absorber returns to the surface layer (surface sheet) side by pressurization. The smaller the amount, the higher the liquid retention of the absorbent body and the easier it is to obtain a dry feeling when worn.
First, a sanitary napkin was placed horizontally. On this sanitary napkin, a cylindrical acrylic plate with an inlet having a diameter of 1 cm is overlapped on the bottom, and the viscosity from the inlet to the excretory part facing region of the sample (position 40 mm from the front end in the longitudinal direction of the sample) is 8. 3 g of defibrinated horse blood adjusted to 0 ± 0.1 cP was injected. After injection, the state was held for 1 minute. Next, the acrylic plate with a cylinder is removed, and an absorbent paper (commercially available tissue paper) having a mass of 6 g in length and 9.5 cm in width and a basis weight of 13 g / m ² is measured on the surface of the top sheet. It was. Further, a weight was placed thereon so that the pressure was 4.5 × 10 ² Pa, and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, the change in mass of the absorbent paper before and after pressurization was measured, and the mass of defibrinated horse blood absorbed by the absorbent paper was taken as the surface liquid return amount.
Next, the above acrylic plate was overlaid again on the sample after the test, and 3 g of defibrinated horse blood was again injected through the injection port 3 minutes after the first injection. The position of horse blood injection into the sanitary napkin was the same as the position where the first 3 g was injected. Then, after maintaining the state for 1 minute after injection, the acrylic plate was removed, and the amount of return of the surface liquid for the second time was measured in the same manner as the previous time. Moreover, at the time of each liquid injection | pouring, time (liquid absorption time) after inject | pouring a liquid until it absorbs all the liquids was measured.
The evaluation results are shown in Table 1 below.

  As is clear from the results shown in Table 1, it was found that Example 1 had a faster liquid absorption rate, less surface liquid return, and superior liquid drawability than Comparative Examples 1 and 2. In this way, it is excellent in liquid retention and difficult to return the liquid to the wearer's skin, so it is difficult to get stuffy and even when there is a large amount of excreted liquid at once, giving the wearer an excellent dry feeling A comfortable wearing feeling can be provided.

1 surface sheet 11 collar (projection)
12 Indentation part 13 Opening part 2 Back surface sheet 3 Absorber 31 Concave part 33 Protrusion absorption part 34 Concave part absorption part 4 Side sheet 5 Leak-proof groove 10 Sanitary napkin

Claims (4)

An absorbent article having a liquid-permeable surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorber disposed between the two sheets,
The absorbent body has a high basis weight region and a low basis weight region having a basis weight relatively lower than the high basis weight region, and the low basis weight region surrounds the high basis weight region. Arranged in a direction, the high basis weight region is relatively denser than the low basis weight region,
The high-basis area has a block-like protruding absorbent portion extending from the top to the bottom of the absorbent body, and the low-basis-weight area is flat so as to surround the protruding absorbent section on the non-skin contact surface side of the absorbent body. A concave portion connected in the direction, and a concave portion absorbing portion disposed on the skin contact surface side of the concave portion and biased toward the surface sheet side and having a thickness smaller than that of the protruding absorbing portion. ,
The surface sheet has a plurality of hook-shaped protrusions formed on the skin contact surface side, and in the depression between the protrusions in a plan view of the surface sheet, the fiber amount is larger than the protrusions. A small portion or an opening portion leading to the thickness direction of the surface sheet is formed ,
In the excretion part corresponding region of the absorbent article, the portion having a small amount of fibers arranged in the depression in the top sheet, or the portion corresponding to the low basis weight region of the absorbent body in the thickness direction Absorbent article having . Leakproof grooves formed by squeezing the topsheet and the absorbent body from the topsheet side are at least near the left and right edges in the article width direction, and the leakproof grooves are absorbed along the longitudinal direction of the article. the absorbent article of claim 1 which is disposed the low basis weight regions of the body and over the high basis weight region. The absorbent article according to claim 1 or 2 , wherein the absorbent body has a water-absorbing polymer , and the water-absorbing polymer is disposed more in the high basis weight region than in the low basis weight region. The absorbent body has a water-absorbing polymer, water-absorbent polymers, absorbent article according to any one of claims 1 to 3, which is distributing the non-skin contact surface side of the recess.

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