JP2018102641A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of exhibiting a sufficient absorption performance, improving flexibility of an absorber for facilitating fitting to a wearer, and excellent in a wearing feeling.SOLUTION: An absorbent article 1 of the invention comprises: a skin side sheet 2; a non-skin side sheet 3; and an absorbent core 41 arranged between both the sheets 2, 3. The absorbent core 41 has a second area 41M between a first area 41F on a front section A side and a third area 41R on a rear section C side, and the second area 41M has a high basis weight part 42 having a basis weight higher than that of the first area 41F and the third area 41R. The high basis weight part 42 is shorter than a length of the absorbent core 41 in the vertical direction X, and both side edges 42s thereof along the vertical direction X extend to both side edges 41s of the absorbent core 41. The high basis weight part 42 has plural high density parts 47 which are separated and have a high density of constitution fibers.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, in absorbent articles such as sanitary napkins and disposable diapers, there are cases where liquid leakage occurs even in daily living activities when there is a large amount of body fluid excreted. Therefore, in the absorbent core of the absorbent article, a method of absorbing body fluid in a wide range by providing a middle and high portion having a large basis weight at the center portion has been proposed (for example, Patent Documents 1 and 2). In Patent Literature 1, in the absorbent core of the absorbent article, a central portion having a higher height and higher density than other portions is provided in the central region, and the central portion is arranged over the entire width of the absorbent core. Absorbent articles are described. Moreover, in patent document 2, the absorber of an absorbent article contains the upper absorption part and lower absorption part in a lamination | stacking state, and the width | variety of an upper absorption part and the width | variety of a lower absorption part become the same dimension. Absorbent articles are described.

  Moreover, as a technique different from these techniques, in order to achieve both flexibility and liquid absorption, a plurality of compression recesses recessed from the front surface side to the back surface side of the absorbent article are reached. An absorbent article is known (Patent Document 3).

JP-A-61-602 JP 2012-81246 A JP 2013-146405 A

  However, Patent Documents 1 and 2 do not describe anything about disposing a high-pressed portion that is recessed into the absorbent body in the absorbent article. And in patent document 3, nothing is described regarding using the absorptive core by which the middle-high part of the center part is distribute | arranged over the full width of the absorptive core for the absorptive core of an absorbent article.

  Therefore, this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention comprises a skin-side sheet, a non-skin-side sheet, and an absorbent core interposed between these two sheets, and a longitudinal direction corresponding to the wearer's front-rear direction and a transverse direction orthogonal to the longitudinal direction; An absorbent article having a front section and a rear section, wherein the absorbent core is disposed between a first region located on the front section side and a third region located on the rear section side. It has two areas, and the second area includes a high basis weight part with a larger basis weight than the basis weight on the first area side and the third area side, When the absorbent core is viewed in plan, the longitudinal length of the high basis weight portion is shorter than the longitudinal length of the absorbent core, and both side edges along the longitudinal direction of the high basis weight portion are absorbed. Extending to both side edges along the longitudinal direction of the absorbent core, and the high basis weight portion is a longitudinal view at the center portion in the lateral direction in plan view of the absorbent core. The length in the direction is longer than the length in the longitudinal direction of the side edge of the high basis weight portion, and the high basis weight portion includes a plurality of high density portions separated from each other and having a high density of constituent fibers. The absorbent article which is arranged is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to express sufficient absorption performance, the softness | flexibility of an absorber improves and it is easy to fit a wearer and is excellent in a feeling of wear.

It is a top view which shows the skin opposing surface side (skin side sheet | seat side) of the sanitary napkin which is preferable one Embodiment of the absorbent article of this invention. It is a partial top view of the skin side sheet | seat in the sanitary napkin shown in FIG. It is a top view of the skin opposing surface side in the absorptive core which the sanitary napkin shown in FIG. 1 has. It is sectional drawing which shows the VV sectional view typically of FIG. It is sectional drawing which shows typically the VI-VI line cross section of FIG. It is an enlarged plan view which shows the arrangement | positioning relationship between the skin side sheet | seat which the sanitary napkin shown in FIG. 1 has, and an absorptive core. It is sectional drawing which shows typically the VIII-VIII line cross section of FIG. It is explanatory drawing explaining the manufacturing process of an absorptive core in FIG. It is sectional drawing which shows typically the XX sectional view shown in FIG. It is the top view which looked at the absorptive core of other embodiments which the sanitary napkin which is other preferred embodiments of the absorptive article of the present invention has from the skin opposing surface side. It is sectional drawing which looked at the sectional view of the sanitary napkin of other embodiment provided with the absorptive core shown in FIG. 10 along the horizontal direction (FIG. 9 equivalent view).

  Hereinafter, an absorbent article of the present invention will be described with reference to the drawings based on a sanitary napkin 1 (hereinafter also referred to as “napkin 1”) which is a preferred embodiment thereof. The top view which looked at the napkin 1 of this embodiment from the skin side sheet | seat side is shown by FIG. As shown in FIG. 1, the napkin 1 according to this embodiment includes a skin-side sheet 2 that forms a skin-facing surface, a non-skin-side sheet 3 that forms a non-skin-facing surface, and an intervening sheet between the two sheets 2 and 3. A longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal to the longitudinal direction X, and a front section A and a rear section C. As shown in FIG. 1, the napkin 1 is divided into an intermediate area B disposed opposite to the wearer's liquid excretion part, and a front area A and a rear area C disposed before and after the longitudinal direction X of the intermediate area B. It is divided.

  In this specification, the vertical direction X corresponds to the longitudinal direction of the wearer, matches the longitudinal direction of the absorbent article (napkin 1), and the lateral direction Y indicates the width direction of the absorbent article (napkin 1). (Direction perpendicular to the longitudinal direction). Therefore, unless otherwise specified, in this specification, the length in the longitudinal direction (vertical direction X) means the “length” that is a distance measured in the vertical direction X, and the length in the lateral direction Y The length means “width” which is a distance measured in the lateral direction Y. The napkin 1 is formed symmetrically with respect to a center line CL extending in the vertical direction X. The vertical direction X is also a direction parallel to the center line CL. Moreover, in this specification, a skin opposing surface is a surface turned to a wearer's skin side at the time of wear of the absorptive article (napkin 1) in the absorptive article (napkin 1) or its constituent member, for example, absorber 4. The non-skin facing surface is directed to the side opposite to the skin side (clothing side) when the absorbent article (napkin 1) is worn in the absorbent article (napkin 1) or its constituent member, for example, the absorbent body 4 It is a surface that is

  As shown in FIG. 1, the napkin 1 has an intermediate area B disposed opposite to the wearer's liquid excretion part (vaginal opening or the like) when worn, and closer to the wearer's ventral side (front side) than the intermediate area B The front section A is disposed, and the rear section C is disposed closer to the wearer's back side (rear side) than the intermediate section B. That is, the napkin 1 is divided in the longitudinal direction X in the order of the front section A, the intermediate section B, and the rear section C.

  In the absorbent article of the present invention, the intermediate zone B is a region having one wing portion 1W in the longitudinal direction X (one wing portion 1W) when the wing portion 1W is provided like the napkin 1 of the present embodiment. The area between the base along the vertical direction X and the root along the vertical direction X of the other wing part 1W. Moreover, in the case of the absorbent article which does not have a wing part, when the absorbent article is folded into the three-fold individual form, two folding lines (crossing the absorbent article in the lateral direction Y ( (Not shown) means a region surrounded by a first folding line and a second folding line as counted from the front end in the longitudinal direction X of the absorbent article.

  As shown in FIG. 1, the napkin 1 of the present embodiment includes a liquid-permeable skin-side sheet 2 that forms a skin-facing surface, a non-skin-side sheet 3 that forms a non-skin-facing surface, and both of these sheets 2, 3. It has an absorber 4 interposed therebetween. The absorber 4 includes an absorbent core 41 and a core wrap sheet (not shown) that wraps the absorbent core 41.

  In the napkin 1, the skin-side sheet 2 covers the entire area of the skin-facing surface of the absorbent body 4 and extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 as shown in FIG. 1. I'm out. On the other hand, the non-skin side sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4, and further extends outward in the lateral direction Y from both side edges along the vertical direction X of the skin side sheet 2, and will be described later. A side flap portion 1 </ b> S is formed together with the side seat 5. The non-skin side sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extended portions from both side edges along the longitudinal direction X of the absorber 4. Yes. In addition, between the skin side sheet | seat 2 and the non-skin side sheet | seat 3, and the absorber 4 may be joined by the adhesive agent.

  In the napkin 1, the side sheet | seat 5 is distribute | arranged to the both sides along the vertical direction X in the skin opposing surface of the skin side sheet | seat 2, as shown in FIG. Preferably, the side sheet 5 is arranged over the entire length in the longitudinal direction X of the skin side sheet 2 so as to overlap both left and right side portions along the longitudinal direction X of the skin side sheet 2 in plan view. In the napkin 1, the pair of side sheets 5 and 5 are joined to the skin-side sheet 2 at the joining portion 6 as shown in FIG. Bodily fluids such as menstrual blood are formed in the inner side of the lateral direction Y outer end of the joint part 6 where the side sheet 5 and the skin side sheet 2 are not joined, and flow outward from the center in the lateral direction Y. Is housed in the space, and as a result, leakage of body fluid can be effectively prevented.

  As shown in FIG. 1, the napkin 1 includes a pair of wing portions 1 </ b> W and 1 </ b> W in which the side flap portion 1 </ b> S projects greatly outward in the lateral direction Y in the intermediate section B on both the left and right sides along the longitudinal direction X. I have. Moreover, as shown in FIG. 1, the skin side sheet | seat 2 and the non-skin side sheet | seat 3 are extended to the outward of the vertical direction X from the front end and the rear end of the vertical direction X of the absorber 4, respectively, and those extension parts Are joined together to form an end seal portion.

  In the napkin 1, as shown in FIG. 1, the skin side sheet 2 and the absorbent body 4 are not formed on the skin facing surface of the skin side sheet 2 by compressing and integrating the skin side sheet 2 and the absorbent core 41. A linear squeezing groove 7 is formed which is integrally recessed toward the skin side sheet 3 side. In the napkin 1, as shown in FIG. 1, the linear compressed groove 7 includes a lateral compressed groove 71 extending in the lateral direction Y in each of the front section A and the rear section C of the absorbent body 4 and an intermediate section B of the absorbent body 4. It has the vertical pressing groove 73 extended in the vertical direction X in the both sides along the vertical direction X, and becomes a cyclic | annular all-around groove | channel as a whole. In addition, as long as the linear pressing groove 7 is extended linearly, the thickness of the bottom part of a groove | channel may be constant, and the thickness of the bottom part of a groove | channel may not be constant. In the linear compressed groove 7, with respect to the skin-side sheet 2 and the absorbent body 4, the density of each fiber that is a constituent member is higher than the density of the peripheral portion of the linear compressed groove 7. Thus, the linear pressing groove 7 formed in the ring-shaped circumferential groove suppresses the diffusion of body fluid in the planar direction of the absorbent body 4 and effectively prevents liquid leakage from the periphery of the napkin 1. Can do.

  In the napkin 1, the skin side sheet | seat 2 has comprised the uneven | corrugated structure provided with the some convex part which protruded to the skin opposing surface side, and the recessed part between them. More specifically, as shown in FIG. 2, the skin-side sheet 2 of the napkin 1 has a high convex portion 2t1 existing in the large polygonal region BT surrounded by the embossed portion 2E and a small polygonal region ST. There are a plurality of low convex portions 2t2 that are lower than the high convex portions 2t1. The skin-side sheet 2 has a plurality of convex portions 2t that protrude to the skin-facing surface side of the skin-side sheet 2 at least at positions that overlap a later-described high basis weight portion 42 of the absorbent core 41. The napkin 1 has the high convex portion 2t1 and the low convex portion 2t2 of the skin side sheet 2 over the entire area of the absorbent core 41. In the skin-side sheet 2 of the napkin 1, a plurality of high convex portions 21L in which a plurality of high convex portions 2t1 are arranged along the horizontal direction Y and a low convex portion row in which a plurality of low convex portions 2t2 are arranged along the horizontal direction Y. 22L are alternately arranged in the vertical direction X. According to such a structure, since the convex part of the skin side sheet 2 is in contact with the skin and the concave part is difficult to contact, the contact area with the wearer's skin can be effectively reduced, and the wearer's skin can be effectively reduced. In addition to facilitating air permeability between the skin and the skin-side sheet 2, it is possible to further reduce the feeling of stickiness and stuffiness when the excreted body fluid comes into contact with the skin. In particular, in the present embodiment in which the high convex portion rows 21L and the low convex portion rows 22L arranged in the horizontal direction Y are alternately arranged in the vertical direction X, the effect of reducing the contact area with the skin of the wearer is high, and ventilation is provided. Excellent in properties.

  The skin side sheet 2 of the napkin 1 is formed by laminating a first layer located on the skin facing surface side and a second layer located on the absorbent core 41 side. In the napkin 1, the fibers constituting the first layer are non-heat-shrinkable fiber layers including non-heat-shrinkable fibers. Moreover, in the napkin 1, the fiber which comprises a 2nd layer is a heat-shrinkable fiber layer containing the heat-shrinkable fiber which heat-shrinked. The skin-side sheet 2 of the napkin 1 is a laminated structure in which the first non-heat-shrinkable fiber layer is disposed on the skin-facing surface of the second heat-shrinkable fiber layer disposed on the non-skin-facing surface side. The sheet is formed with a plurality of embossed portions 2E. High convex part 2t1 and low convex part 2t2 are comprised by the non-heat-shrinkable fiber layer of the 1st layer, and are satisfy | filled with the same fiber which comprises a non-heat-shrinkable fiber layer. Such a skin side sheet | seat 2 can be obtained by the manufacturing method as described in Unexamined-Japanese-Patent No. 2015-186543.

  Next, in the napkin 1, as shown in FIG. 3, the absorbent core 41 which comprises the absorber 4 is the 1st area | region 41F located in the front area A side of the vertical direction X, and the 1st area | region located in the back area C side. It has three regions 41R, and has a second region 41M between the first region 41F and the third region 41R. The second area 41M includes a high basis weight portion 42 having a larger basis weight than the basis weight on the first area 41F side and the third area 41R side. In the napkin 1, the second region 41 </ b> M of the absorbent core 41 is disposed in the intermediate section B. The napkin 1 has a high basis weight portion 42 in the intermediate area B.

  When the pair of wing portions 1W are provided on both outer sides in the lateral direction Y like the napkin 1, the second region is located between the roots of the wing portions 1W arranged at intervals in the longitudinal direction X in each wing portion 1W. 41M exists. That is, in the napkin 1, the length of the second region 41M in the vertical direction X is the same as the length between the roots of the wing portions 1W arranged at intervals in the vertical direction X in each wing portion 1W.

  Moreover, in the napkin 1, as shown in FIG. 4, the 2nd area | region 41M is the 1st area | region 41F and 2nd area | region which are located ahead of the 2nd area | region 41M except the middle-high boundary groove part 43 and the high-density part 47 which are mentioned later. The thickness is larger than the thickness of the absorbent core 41 in each region of the third region 41R located behind 41M. In the napkin 1, the absorbent core 41 has a shape that is long in the same direction as the longitudinal direction X of the napkin 1. Therefore, the longitudinal direction of the absorbent core 41 is the same direction as the longitudinal direction X of the napkin 1, and the lateral direction of the absorbent core 41 is the same direction as the lateral direction Y of the napkin 1.

  Preferably, in the napkin 1, as shown in FIG. 4, the thickness of the high basis weight portion 42 is larger than the thickness of the first region 41F and the third region 41R in the absorbent core 41, and the absorbent core The basis weight is higher than the basis weight of the first region 41F in 41. As for the thickness and basis weight of each of the first region 41F and the third region 41R to be compared with the thickness and basis weight of the high basis weight portion 42, a groove 45 described later is formed in the first region 41F and the third region 41R. In the case, it means the thickness and basis weight of the first region 41F and the third region 41R where there is no groove 45. The absorbent core 41 of the napkin 1 has a thickness difference by providing a difference in the basis weight of the core material. Therefore, unlike the case of providing a thickness difference by compressing a part of the absorbent core having a uniform basis weight. The absorbent core 41 is flexible as a whole.

The thickness of the high basis weight portion 42 is such that the high basis weight portion 42 protrudes toward the skin, and the first region 41F and the first region in the absorbent core 41 are improved from the viewpoint of improving the liquid absorbency and the like of the absorbent core 41. The thickness of the three regions 41R is preferably 120% (ie 1.2 times) or more and 700% (ie 7 times) or less, more preferably 140% or more and 500% or less. The above-described configuration is particularly effective when the high basis weight portion 42 is provided in the intermediate section B like the napkin 1 of the present embodiment. Specifically, the thickness of the high basis weight part 42 is preferably 2 mm or more and 10 mm or less, more preferably 3 mm or more and 7 mm or less. In addition, although it is preferable that it is the relationship of the said thickness in the whole range of the high basic weight part 42, in the case where increase / decrease is provided in the thickness direction of the high basic weight part 42, in the thickest part, the above-mentioned It only has to be a relationship. In addition, although it is preferable that it is the relationship of the said thickness in the whole range of the high basic weight part 42, in the thickness direction of the high basic weight part 42, the thickness is gradual in the horizontal direction Y or the vertical direction X, or both directions. In the case where there is an increase / decrease, it is only necessary to have the above relationship in the thickest part. Specifically, the thickness of the first region 41F or the third region 41R is preferably 0.5 mm or more and 7 mm or less, more preferably 1 mm or more and 3.5 mm or less, in a portion without a groove to be described later. In the napkin 1, it is preferable that the thickness of the first region 41F or the third region 41R is substantially uniform in a portion where a groove 45 described later does not exist, but the side of the first region 41F or the third region 41R. In the case where a gradual increase / decrease in thickness is provided in the direction Y or the vertical direction X, it is only necessary that the above relationship is satisfied in the thickest portion.
The thickness of each part of the absorptive core 41 such as the high basis weight portion 42, the first region 41F or the third region 41R, and the middle-high adjacent portion 44 described later is measured by the following method.

<Method for measuring thickness of each part of absorbent core 41>
The absorbent core is allowed to stand in a horizontal place so as not to be wrinkled or bent, and each part that is a measurement object is cut out from the absorbent core 41. And the thickness under the load of 5 cN / cm < ² > in the cut-out measuring object is measured. Specifically, for example, a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Is used for measuring the thickness. At this time, a circular plate or a square plate (30 mm × 30 mm, thickness) having a size adjusted so that the load is 5 cN / cm ² between the tip of the thickness meter and the cut object to be measured. An acrylic plate (about 5 mm) is placed and the thickness is measured. When measuring the thickness of the high basic weight part 42 in the absorptive core 41, it measures so that the high-density part 47 mentioned later may not be included. Moreover, when measuring the thickness of the 1st area | region 41F in the absorptive core 41, the 3rd area | region 41R, etc., it measures so that the groove part 45 mentioned later may not be included.

In the napkin 1, the basis weight of the high basis weight part 42 in the absorbent core 41 is such that the high basis weight part 42 protrudes toward the skin and improves the absorbability of the liquid in the absorbent core in the intermediate area, etc. preferably 100 g / m ² or more 1500 g / m ² or less, more preferably 200 g / m ² or more 1200 g / m ² or less. Further, the basis weight of the first region 41F or the basis weight of the third region 41R in the absorbent core 41 is preferably 50 g / m ² or more and 1000 g / m ² or less, more preferably 100 g / m ² or more and 900 g / m ² or less. It is. The basis weight of the high basis weight part 42 and each region 41F, 41R is the mass of the sample of the target measurement part cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above, and the skin facing the sample. Divide by the area of the surface side surface.

  As shown in FIG. 3, the high basis weight portion 42 included in the second region 41 </ b> M is a plan view of the absorbent core 41, and the length in the longitudinal direction X of the high basis weight portion 42 is the longitudinal direction X of the absorbent core 41. The both side edges 42 s and 42 s along the longitudinal direction X of the high basis weight portion 42 extend to both side edges 41 s and 41 s along the longitudinal direction X of the absorbent core 41. Preferably, the high basis weight portion 42 has a plan view of the absorbent core 41 as shown in FIG. 3, and the maximum width portion of the high basis weight portion 42 follows both side edges along the longitudinal direction X of the absorbent core 41. It has a middle-high central portion 421 formed to extend in the vertical direction X to a predetermined length. The length in the lateral direction Y of the maximum width portion of the middle-high central portion 421 is the same as the width of the absorbent core 41. Here, the width of the absorbent core 41 means the width of the absorbent core 41 including the high basis weight portion 42. As for the maximum width part of the high basic weight part 42, it is desirable that the skin side width and the non-skin side width are substantially the same, and it is desirable that the maximum width part is particularly uniform in the thickness direction. In the napkin 1, as shown in FIG. 3, the middle-high central part 421 has a constant interval between the side edges 41s, 41s along the longitudinal direction X of the absorbent core 41 in the maximum width part. , 41s are more preferably parallel to the vertical direction X and linear. However, it does not exclude the case where the side edge shape is wavy, etc., and if the width of the absorbent core 41 varies within the range of the difference of about 5% of the width of the maximum width portion, the same width and To do.

  In the napkin 1, the high basis weight portion 42 has a plan view of the absorbent core 41 as shown in FIG. 3, and the high basis weight portion 42 of the high basis weight portion 42 from the middle / high center portion 421 toward the front section A side or the rear section C side. A front-side convex portion 422 or a rear-side convex portion 423 that is shorter in the lateral direction Y than the maximum width portion is provided. The napkin 1 has one front convex portion 422 and one rear convex portion 423.

  In the napkin 1, the front convex portion 422 is provided with a top portion 422 t of the front convex portion 422 on the center line CL extending in the vertical direction X, and from the top portion 422 t to the side edge 41 s along the vertical direction X of the absorbent core 41. Both side sides 422s and 422s extending in a straight line shape are provided. Moreover, in the napkin 1, the rear side convex part 423 has the top part 423t of the rear side convex part 423 arranged on the center line CL extending in the vertical direction X, and the side edge along the vertical direction X of the absorbent core 41 from the top part 423t. Both sides 423s and 423s extending in a straight line over 41s are provided. As described above, when the absorbent core 41 is viewed in plan, the high basis weight portion 42 has a portion in which the length in the vertical direction X gradually decreases from the central portion in the horizontal direction Y toward the side edge 4s. .

  Thus, since the high basic weight part 42 has the front side convex part 422, the middle-high center part 421 and the back side convex part 423 which extend in strip | belt shape, in the napkin 1, as shown in FIG. The high basis weight portion 42 has a length in the longitudinal direction X at the center portion in the lateral direction Y longer than the length in the longitudinal direction X of the side edge 42 s of the high basis weight portion 42 in plan view of the conductive core 41. . Further, both side sides 422s and 422s forming the front convex portion 422 extend in a straight line from the top portion 422t to the side edge 41s along the longitudinal direction X of the absorbent core 41, and the rear convex portion 423. 423 s and 423 s are formed in a linear shape from the top 423 t to the side edge 41 s along the longitudinal direction X of the absorbent core 41. As described above, when the absorbent core 41 is viewed in plan, the high basis weight portion 42 has a portion in which the length in the vertical direction X gradually decreases from the central portion in the horizontal direction Y toward the side edge 4s. .

  In the napkin 1, as shown in FIG. 3, in the front convex portion 422 in the absorbent core 41 of the napkin 1, the distance (width d) between the side sides 422 s and 422 s is both sides along the longitudinal direction X of the absorbent core 41. It gradually decreases from the edges 41s and 41s toward the top 422t. Similarly, in the rear side convex portion 423 of the absorbent core 41 of the napkin 1, the distance (width d) between the side sides 423s and 423s is from the side edges 41s and 41s along the longitudinal direction X of the absorbent core 41 to the top portion 423t. It is gradually decreasing. Here, the width d gradually decreasing means that the width d continuously decreases little by little toward the top portions 422t and 423t. In the napkin 1, the high basis weight portion has a hexagonal shape in plan view.

  In the absorbent core 41 of the napkin 1, the angle α formed by the one side 422s and the center line CL extending in the longitudinal direction X is preferable from the viewpoint of improving fit to the body shape and followability in movement. Is 20 ° to 75 °, more preferably 30 ° to 60 °. The rear side convex portion 423 is the same as the front side convex portion 422.

  As shown in FIG. 5, the middle-high center portion 421 of the high basis weight portion 42 has a height as viewed from a cross section as shown in FIG. 5 from the center portion in the lateral direction Y toward both side edges along the longitudinal direction X. It is formed so that it may become low, and it becomes possible to improve the liquid absorbency etc. in the intermediate area B. In this case, the ratio (T1 / T2) of the height (T1) of the central portion arranged on the center line CL to the height (T2) at the side edge 41s having the smallest height is such that the middle and high portions are worn. From the viewpoint of being able to obtain a good feeling of wearing that adheres well to the excretory part and is not uncomfortable, it is preferably 1.1 or more and 4 or less, particularly preferably 1.3 or more and 3 or less.

  In the napkin 1, the middle basis portion 421 of the high basis weight portion 42 has a basis weight from the center portion in the lateral direction Y toward both side edges along the longitudinal direction X as shown in FIG. 5. It is formed so as to be small, so that it is possible to improve the liquid absorbency and the like in the intermediate section. Moreover, from the viewpoint of preventing unexpected wrinkles and breakage of the napkin 1 from the viewpoint of preventing unexpected wrinkles and breakage of the napkin 1, at least the skin contact surface side of the first area 41F and the third area 41R of the absorbent core 41 is provided. It has the form which does not have a recessed part whose basic weight is lower than the quantity. Here, the basis weight of the first region 41F and the third region 41R means the basis weight of the portion excluding the groove portion 45 when the first region 41F and the third region 41R have the groove portion 45.

  The total length L2 of the high basis weight portion 42 in the vertical direction X is preferably 25% or more and 90% or less, more preferably 30% or more and 75% or less, with respect to the total length L1 of the absorbent core 41 in the vertical direction X. The full length L1 indicates the distance at the longest position in the longitudinal direction X of the absorbent core 41, and the full length L2 means the distance at the longest position in the vertical direction X of the high basis weight portion 42 (see FIG. 3). .

  The total length L3 in the longitudinal direction X of the middle and high center portion 421 constituting the high basis weight portion 42 is preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less of the total length L2 of the high basis weight portion 42. is there.

  The total length L4 in the longitudinal direction X of the front convex portion 422 constituting the high basis weight portion 42 is preferably 5% to 50%, more preferably 10% to 30%, of the total length L2 of the high basis weight portion 42. It is. The full length X in the longitudinal direction of the rear convex portion 423 constituting the high basis weight portion 42 is the same as the full length L4 in the vertical direction X of the front convex portion 422. The total length L4 means the distance at the longest position in the longitudinal direction X of the front convex portion 422 (see FIG. 3).

  In the napkin 1, as shown in FIG. 3, the absorptive core 41 has the middle-high boundary groove part 43 which divides the boundary with the part other than the high basic weight part 42 and the high basic weight part 42 in the 2nd area | region 41M. Yes. In the napkin 1, the middle / high boundary groove portion 43 includes a front middle / high boundary groove portion 43 a extending along both side sides 422 s and 422 s forming the front convex portion 422 constituting the high basis weight portion 42, and a rear convex portion 423. It has a rear middle / high boundary groove 43c extending along both sides 423s and 423s to be formed. The front middle / high boundary groove 43a and the rear middle / high boundary groove 43c are formed over the entire length (full width) of the absorbent core 41 in the lateral direction Y. For this reason, it is hard to produce a vertical wrinkle in the vertical direction of the napkin 1 with respect to the force acting on the inner side in the width direction of the absorbent core 41 from the legs, and the napkin 1 is easy to fit three-dimensionally along the shape of the body. Become. Thus, in the absorptive core 41, the boundary with the high basic weight part 42 is demarcated by the front middle / high boundary groove part 43a and the back middle / high boundary groove part 43c.

  Further, as shown in FIG. 6, the napkin 1 has a high basis weight portion at a position overlapping with the high basis weight portion 42 extending to both side edges 41 s and 41 s along the longitudinal direction X of the absorbent core 41 in the intermediate section B. The high convex part 2t1 which protrudes in the skin opposing surface side of the skin side sheet | seat 2 along the horizontal direction Y of 42 forms the high convex part row | line 21L by which multiple arrangement | positioning was carried out along the horizontal direction Y, and low convex part 2t2 forms the low convex part row | line 22L by which multiple arrangement | positioning was carried out along the horizontal direction Y. As shown in FIG. And as shown in FIG. 7, the high convex part row | line | column 21L and the low convex part row | line | column 22L are alternately distribute | arranged to the vertical direction X in the position which overlaps with the high basic weight part 42. As shown in FIG.

  In the napkin 1, the groove width of the middle / high boundary groove portion 43 in the absorbent core 41 is preferably 0.1 mm or more and 5.0 mm or less, more preferably 0.5 mm or more from the viewpoint of improving the liquid absorbency and the like in the intermediate section. It is 3.0 mm or less. In addition, the groove width of the middle / high boundary groove portion 43 and the thickness described later are measured in a direction perpendicular to the extending direction of the middle / high boundary groove portion 43 and measured from a photograph of the cut end surface. In the napkin 1, the thickness of the middle / high boundary groove portion 43 in the absorbent core 41 is preferably 0.08 mm or more and 7.0 mm or less, more preferably 0.15 mm from the viewpoint of improving the liquid absorbency and the like in the intermediate zone B. It is 3.5 mm or less.

In the napkin 1, the middle and high boundary groove portions 43 are lower than the basis weight of the high basis weight portion 42, and further, the basis weight is lower than the basis weight of the first region 41F and the basis weight of the third region 41R in the absorbent core 41. Is formed. Here, the basis weight of the first region 41 </ b> F and the basis weight of the third region 41 </ b> R mean the basis weight of the portion excluding the groove portion 45 when having the groove portion 45. The basis weight of the middle / high boundary groove 43 is preferably 10 g / m ² or more and 350 g / m ² or less, more preferably 20 g / m ² or more and 250 g / m ² or less. In addition, the basic weight of the middle-high boundary groove part 43 is the skin facing surface side of the sample of the part of the middle-high boundary groove part 43 cut out as described in the method for measuring the thickness of each part of the absorbent core 41 described above. Divide by the area of the surface.

  In the napkin 1, the absorptive core 41 has the middle-high adjacent part 44 in the area | region except the high basic weight part 42 and the middle-high boundary groove part 43 in the 2nd area | region 41M, as shown in FIG. In the second region 41M, the middle-high adjacent portion 44 includes a front middle-high adjacent portion 44a disposed on the first region 41F side adjacent to the front convex portion 422 constituting the high basis weight portion 42, and the high basis weight portion 42. A rear middle-high adjacent portion 44c disposed on the third region 41R side adjacent to the rear-side convex portion 423 to be configured. The front middle-high adjacent portion 44a is formed symmetrically with respect to the center line CL extending in the vertical direction X. In the front middle / higher adjacent portion 44a, the half portion on the side edge 41s side along the longitudinal direction X of the absorbent core 41 than the center line CL has a length in the longitudinal direction X centered from the one side edge 41s. It is formed so as to gradually decrease toward the line CL. The rear middle high adjacent portion 44c is also formed symmetrically with respect to the center line CL extending in the vertical direction X, similarly to the front middle high adjacent portion 44a. The half of the side edge 41s side along the longitudinal direction X of the absorbent core 41 with respect to the center line CL in the rear middle-high adjacent portion 44c has a length in the longitudinal direction X centered from the one side edge 41s. It is formed so as to gradually decrease toward the line CL.

  In the napkin 1, the middle-high adjacent portion 44 has a thickness larger than that of the middle-high boundary groove portion 43 and smaller than a thickness of the high basis weight portion 42 in the absorbent core 41 as shown in FIG. 4. Each middle-high adjacent portion 44a, 44c is excellent in followability to body movement when the thickness is the same or smaller than the thickness of the adjacent first region 41F and third region 41R, and when large, it is resistant to repeated deformation. Excellent resistance. The thickness of each middle-high adjacent portion 44 is preferably 0.5 mm or greater and 10.0 mm or less, and more preferably 1.0 mm or greater and 7.0 mm or less. The thickness of the middle-high adjacent portion 44 is measured based on the method for measuring the thickness of each portion of the absorbent core 41 described above.

In the napkin 1, the basis weight of the middle / high adjacent portion 44 is smaller than the basis weight of the high basis weight portion 42 and larger than the basis weight of the middle / high boundary groove portion 43. It should be noted that the basis weight of each of the middle and high adjacent portions 44a and 44c is excellent in followability to the body movement if it is the same or smaller than the basis weight of the adjacent first region 41F and third region 41R, and if it is large, it is resistant to repeated deformation. Excellent resistance. The basis weight of the middle-high adjacent portion 44 is preferably 20 g / m ² or more and 800 g / m ² or less, more preferably 50 g / m ² or more and 700 g / m ² or less. In addition, the basic weight of the middle-high adjacent part 44 is the surface on the skin facing surface side of the sample of the middle-high adjacent part 44 cut out as described in the measuring method of the thickness of each part of the absorbent core 41 described above. Divide by the area of

  In the napkin 1, as shown in FIG. 3, the first region 41 </ b> F and the third region 41 </ b> R in the absorbent core 41 are provided with groove portions 45 having a smaller basis weight than the surroundings, and the groove portions 45 </ b> X extend in the longitudinal direction X. And a lateral groove 45Y extending in the lateral direction Y. In the napkin 1, each of the first region 41F and the third region 41R has a groove portion 45 having a relatively small basis weight and a small absorbing portion 46 having a relatively large basis weight. Preferably, the groove 45 includes a vertical groove 45X extending in the vertical direction X and a horizontal groove 45Y extending in the horizontal direction Y. The vertical grooves 45X extending in the vertical direction X are arranged with a constant interval in the horizontal direction Y, and the horizontal grooves 45Y extending in the horizontal direction Y are arranged with a constant interval in the vertical direction X. The small absorption part 46 is arranged at the position of the grid defined by the vertical groove 45X and the horizontal groove 45Y. The thickness and basis weight of the first region 41F and the third region 41R described above mean the thickness and basis weight of the small absorbent portion 46.

  In the napkin 1, the absorbent core having the groove 45 and the small absorbent portion 46 in the first region 41F and the third region 41R, and the high basis weight portion 42, the middle / high boundary groove portion 43, and the middle / high adjacent portion 44 in the second region 41M. The whole 41 is integrally molded. “Integrally molded” means that the same material is used to form parts in one process, unlike the case where members manufactured in different processes are joined by means of bonding, such as adhesives or compression. Means that

The absorptive core 41 of the napkin 1 described above includes, for example, an accumulation recess 55 on the outer peripheral surface and rotates in one direction R, as shown in FIG. 8A, and the accumulation drum 54. It can manufacture using the fiber pile apparatus provided with the duct (not shown) which supplies a core material in a scattering state to the outer peripheral surface.
A plurality of stacking recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54. The bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.

  Further, as shown in FIG. 8A, one concave portion 56 b for forming the second region 41 </ b> M of the absorbent core 41 is formed on a part of the bottom surface 56 of one accumulation concave portion 55. Yes. Moreover, the 1st air-permeable member 57 for forming the middle-high boundary groove part 43 which divides the high basic weight part 42 and the middle-high adjacent part 44 is arrange | positioned in the recessed part 56b at the bottom face. The first breathable member 57 is arranged at a position corresponding to the middle / high boundary groove 43 and is fixed so as to protrude from the bottom surface of the recess 56b. In addition, a second breathable member 58 for forming the groove 45 is disposed on the bottom surface 56 of the upstream region and the downstream region in the rotation direction R adjacent to the recess 56b. The second breathable member 58 is disposed at a position corresponding to the vertical groove 45X and the horizontal groove 45Y, and is fixed so as to protrude from the bottom surface 56 of the accumulation recess 55. The first breathable member 57 and the second breathable member 58 may be non-breathable members, and are made of, for example, metal, plastic, ceramic, or the like.

  Similarly to the known fiber-stacking device provided with the fiber-synthesizing drum, the core material mixed with the water-absorbing polymer and the pulp fiber is supplied into the duct while sucking from the bottom surface of the concave portion 55 for accumulation. As shown in (b), the core material is deposited in a predetermined shape in the recesses 55 for accumulation. The precursor of the absorbent core 41 is obtained by releasing the deposit 40 from the accumulation recess 55. The precursor of the absorbent core 41 is covered with a core wrap sheet (not shown), then cut with a rotary cutter or the like, and conveyed in a conveying direction by a conveying means such as a belt conveyor. Thus, the absorptive core 41 is obtained. The absorbent core 41 covered with the core wrap sheet (not shown) obtained in this manner is compressed in an appropriate manner by pressurizing the whole or a part, for example, by passing it between a pair of rolls once or a plurality of times. . Thereby, the part accumulated in the recessed part 56b becomes the high basic weight part 42 in which both basic weight and thickness are relatively large. Similarly, the portion made of the core material deposited in the upstream region and the downstream region adjacent to the recess 56b becomes the first region 41F and the third region 41R in the absorbent core 41 having a relatively small basis weight. Further, the portion made of the core material deposited on the first air-impermeable member 57 of the recess 56b becomes the middle / high boundary groove 43 that is relatively smaller than the basis weight of the first region 41F and the basis weight of the third region 41R. . The portion made of the core material deposited on the second non-breathable member 58 in the upstream region and the downstream region adjacent to the recess 56 b becomes the groove portion 45 that is relatively smaller than the basis weight of the small absorbent portion 46.

  As shown in FIGS. 1, 3, and 6, the high basis weight portion 42 of the napkin 1 is provided with a plurality of high-density portions 47 that are spaced apart from each other and have a higher density of constituent fibers than their adjacent portions. ing. Each high-density part 47 is formed to be recessed in a concave shape from the skin facing surface side to the non-skin facing surface side of the absorbent body 4 formed by wrapping the absorbent core 41 with a core wrap sheet (not shown). . Preferably, each high-density part 47 is formed from a compressed part in which the density of the constituent fibers is relatively increased by compression. Therefore, the high basis weight part 42 is divided into a high density part 47 in which the density of the constituent fibers is increased by compression and a low density part that is an uncompressed part other than the high density part 47.

  In the napkin 1, as shown in FIG. 9, each high-density part 47 is formed so that only the skin facing surface side of the absorbent body 4 is recessed in a concave shape. In the absorbent body 4, the high-density portion 47 is consolidated more than the portion other than the high-density portion 47 and the linear compressed groove 7. The high-density part 47 of the napkin 1 can be formed by embossing the absorbent body 4 formed by wrapping the absorbent core 41 with a core wrap sheet (not shown), for example.

The high density portion 47 can adopt various shapes such as a circle, an ellipse, a square, a rectangle, and a triangle when the absorbent core 41 is viewed in plan from the skin facing surface side. Then, as shown in FIG. 3, a circular shape is adopted. Each high-density portion 47 has an area when viewed in plan is larger than the area of each small polygonal region ST of the skin-side sheet 2 shown in FIG. 2 and further larger than the area of each large polygonal region BT. Specifically, it is preferably 0.5 mm ² or more and 50 mm ² or less, and more preferably 1 mm ² or more and 30 mm ² or less.

  The high density portion 47 is preferably disposed in a region sandwiched between the pair of vertical pressing grooves 73 and 73 in the high basis weight portion 42. In the napkin 1, as shown in FIG. 6, the high density part 47 is also arrange | positioned also in the area | region pinched by a pair of vertical pressing grooves 73 and 73, and the area | region of the horizontal direction Y outer side. In the napkin 1, the high density portions 47 are arranged in a substantially staggered pattern as shown in FIGS. 3 and 6. Here, the zigzag pattern means that the high-density portions 47 in which the high-density portions 47 are arranged at equal intervals in the vertical direction X are arranged in a plurality of rows at equal intervals in the horizontal direction Y. An arrangement in which the closest high-density portions 47 and 47 constituting the row of high-density portions 47 adjacent to Y are shifted in the half-pitch vertical direction X.

The number of arrangement per unit area of the high-density portion 47 is preferably 0.3 / cm ² or more and 10 / cm ² or less, and is 0.5 / cm ² or more and 5 / cm ² or less. More preferably.

As the forming material of each constituent member of the napkin 1 of the present embodiment described above, those known in the technical field can be used. The non-skin-side sheet 3 preferably has poor liquid permeability or impermeability, preferably has a basis weight of 10 to 50 g / m ² and a thickness of 8 to 200 μm. Pulp fibers and water-absorbing polymers can be used for the core material of the absorbent core 41. Moreover, you may mix | blend a deodorizer, an antibacterial agent, etc. with the absorptive core 41 as needed. When a core wrap sheet (not shown) that covers the absorbent core 41 is used, tissue paper, a water-permeable nonwoven fabric, or the like can be used. As the side sheet 5, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The joint portion 6 that joins the side sheet 5 and the skin side sheet 2 can be formed in accordance with a conventional method by heat sealing.

  According to the napkin 1 described above, as shown in FIGS. 1 and 3, the absorbent core 41 includes the high basis weight portion 42 extending to both side edges 41 s and 41 s along the longitudinal direction X of the absorbent core 41. . Therefore, while wearing the napkin 1, a large amount of body fluid such as blood can be absorbed more stably and diffusion of the body fluid in the lateral direction Y can be controlled. As shown in FIGS. 3 and 9, the high basis weight portion 42 is provided with a plurality of high density portions 47 that are spaced apart from each other and have a high density of constituent fibers. Therefore, the bodily fluid excreted in the skin-side sheet 2 is easily drawn into the plurality of high-density portions 47 of the high basis weight portion 42, the entire high basis weight portion 42 can be utilized, and sufficient absorption performance can be expressed. Further, the presence of the high-density portion 47 locally in the high basis weight portion 42 improves the flexibility of the absorbent body 4 including the absorbent core 41, and the napkin 1 can be easily fitted to the wearer. The feeling of wearing becomes excellent.

  Further, in the napkin 1, when the absorbent core 41 is viewed in plan, the high basis weight portion 42 has a length in the longitudinal direction X at the central portion in the lateral direction Y, and the length of the side edge 42 s of the high basis weight portion 42. It is formed longer than the length in the direction X. As shown in FIG. 3, in the napkin 1, the high basis weight portion 42 is divided into a front convex portion 422, a middle / high central portion 421, and a rear convex portion 423. Therefore, even if the napkin 1 is worn in a slightly displaced state, if the high basis weight portion 42 has either one of the front side convex portion 422 and the rear side convex portion 423, the napkin is removed from both thighs. When the front side convex portion 422 and the rear side convex portion 423 are deformed with respect to the lateral inward Y force of 1, the high basis weight portion 42 is excellent in fit to the body shape and gives the wearer a sense of incongruity. It has become difficult. In particular, in the napkin 1, both sides 422s and 422s forming the front convex portion 422 extend linearly from the top portion 422t to the side edge 41s along the longitudinal direction X of the absorbent core 41, and the rear convex portion Both sides 423 s and 423 s forming 423 extend in a straight line from the top 423 t to the side edge 41 s along the longitudinal direction X of the absorbent core 41. As described above, when the absorbent core 41 is viewed in plan, the high basis weight portion 42 has a portion in which the length in the vertical direction X gradually decreases from the central portion in the horizontal direction Y toward the side edge 4s. Therefore, the followability to the body shape of the high basis weight part 42 is further improved.

  Moreover, in the napkin 1, as shown in FIG. 1, it has the linear pressing groove 7 in which the skin side sheet | seat 2 and the absorptive core 41 are recessed integrally. In particular, in the napkin 1, the high-density portion 47 of the absorbent core 41 is disposed in the region sandwiched between the pair of vertical pressing grooves 73 and 73 in the high basis weight portion 42, and thus is excreted by the skin-side sheet 2. The body fluid is easily drawn into the plurality of high density portions 47 of the high basis weight portion 42, and the absorption performance of the absorbent body 4 can be sufficiently expressed.

  Moreover, in the napkin 1, as shown in FIG.6 and FIG.9, it has the convex part 2t which protruded in the skin opposing surface side in the position where the skin side sheet 2 overlaps with the high basic weight part 42 of the absorptive core 41. Yes. Therefore, coupled with the decrease in the area of contact with the skin of the wearer by the convex portion 2t of the skin-side sheet 2, the liquid return property of the body fluid once absorbed by the absorbent body 4 can be greatly improved, Reduces stickiness and stuffiness when worn. Thus, according to the napkin 1, while sufficient absorption performance can be expressed, the feeling of stickiness at the time of wear and a feeling of stuffiness are reduced, and it is excellent in a feeling of wear.

  Moreover, in the napkin 1, the high convex part 2t1 and the low convex part 2t2 of the skin side sheet | seat 2 are satisfy | filled with the same fiber which comprises a non-heat-shrinkable fiber layer. In addition, since the non-heat-shrinkable fiber layer of the first layer contains non-heat-shrinkable fibers and the heat-shrinkable fiber layer of the second layer contains heat-shrinkable fibers, the second layer of heat-shrinkable fiber layers Thus, the body fluid excreted in the skin side sheet 2 can be further spread in the lateral direction Y at an appropriate speed.

  Moreover, in the napkin 1, as shown in FIG. 6, the high convexity which protrudes in the skin opposing surface side of the skin side sheet | seat 2 along the horizontal direction Y of the high basic weight part 42 in the position which overlaps with the high basic weight part 42. The portions 2t1 form a plurality of high convex portion rows 21L arranged along the horizontal direction Y, and the low convex portions 2t2 form a plurality of low convex portion rows 22L arranged along the horizontal direction Y. High convex portion rows 21 </ b> L and low convex portion rows 22 </ b> L are alternately arranged in the vertical direction X at positions overlapping the amount portions 42. Therefore, the bodily fluid excreted in the skin-side sheet 2 is likely to spread at an appropriate speed in the lateral direction Y, and the high-density portion 47 of the absorbent body 4 quickly captures the spread bodily fluid, so that sufficient absorption performance can be expressed. In addition, the feeling of stickiness and stuffiness when worn is reduced and the feeling of wearing is excellent.

  Further, in the napkin 1, as shown in FIG. 3, the absorbent core 41 is viewed in plan, and the first region 41F and the third region 41R of the absorbent core 41 are provided with groove portions 45 having a basis weight smaller than the surroundings, The groove portion 45 has a vertical groove 45X extending in the vertical direction X and a horizontal groove 45Y extending in the horizontal direction Y. Therefore, the high basis weight portion 42 is excellent in followability to the body shape, coupled with a decrease in the area of contact with the wearer's skin by the high convex portion 2t1 and the low convex portion 2t2 of the skin side sheet 2, A feeling of wear at the time of wear improves.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to the napkin 1 of this embodiment at all, and can be changed suitably.

  Moreover, although the whole absorptive core 41 of the napkin 1 is integrally molded, it does not need to be integrally molded. For example, in the absorptive core 41, the core material is formed at the same height from the first region 41F to the third region 41R, and then the one formed of another core material is arranged to form a high basis weight. The quantity part 42 may be formed.

  Moreover, the form as shown in FIG. 10 may be sufficient as the high basic weight part 42 in the absorptive core 41 of the napkin 1. FIG. In the absorbent core 41 shown in FIG. 10, the high basis weight portion 42 having a larger basis weight than the basis weight on the first region 41 </ b> F side and the third region 41 </ b> R side is elongated in the longitudinal direction X of the absorbent core 41. The central high basis weight portion 42BC having both ends and both side edges 41s, 41s along the longitudinal direction X of the absorbent core 41 extending outward from the lateral direction Y from both side edges along the longitudinal direction X of the central high basis weight portion 42BC. And side high basis weight portions 42BS, 42BS extending up to. The central high basis weight portion 42BC may be formed only in the intermediate section B, but extends from the intermediate section B to a part of the rear section C in the absorbent core 41 shown in FIG. A pair of side high basis weight portions 42BS, 42BS is formed in the intermediate section B. The central high basis weight portion 42BC extending from the intermediate zone B to a part of the rear zone C has a larger basis weight than the peripheral basis weight excluding the central high basis weight portion 42BC in the third region 41R. Yes. The side high basis weight portion 42BS has a larger basis weight than the basis weight in the first region 41F and the third region 41R. As shown in FIG. 10, the high basis weight portion 42 having the central high basis weight portion 42BC and the pair of side high basis weight portions 42BS, 42BS has a length in the longitudinal direction X at the center portion in the lateral direction Y. The side length 42s of the high basis weight portion 42 is formed longer than the length in the vertical direction X.

  In the absorptive core 41 shown in FIG. 10, the high basic weight part 42 has the middle-high part groove part 43m with thin thickness. Here, “thin middle and high groove portion 43m having a small thickness” means that the bottom has a thickness even though it is thin in the thickness direction Z, and there is no constituent material of the absorbent core at all and penetrates the absorbent core. It means both of the cases where the thickness is smaller, and means a portion where the thickness is thinner than other portions in the high basis weight portion 42. In the napkin 1, the middle and high part groove part 43m has a basis weight of the bottom part thereof other than the area of the absorbent core 41, specifically, the basis weight of the small absorbent part 46 of the first area 41F and the third area 41R. It is low.

  In the absorbent core 41 shown in FIG. 10, the middle and high part groove part 43 m has an outer peripheral middle and high boundary groove part 43 ma that extends along the contour of the high basis weight part 42. In the napkin 1, as shown in FIG. 10, the high basis weight portion 42 of the absorbent core 41 is surrounded by a middle and high portion groove portion 43 m having a relatively low basis weight and a middle and high portion groove portion 43 m having a relatively high basis weight. A block structure having a plurality of middle, high, and small absorbing portions 43k has a plurality of block regions arranged in the vertical direction X. The middle-high portion groove portion 43m includes, in addition to the outer-periphery middle-high boundary groove portion 43ma and the outer-periphery middle-high boundary groove portion 43ma, the horizontal middle-high portion groove portion 43my extending in the transverse direction Y of the absorbent core 41 and the longitudinal middle height extending in the longitudinal direction X of the absorbent core 41. Part groove part 43mx. The horizontal middle and high groove portion 43my is formed in a straight line continuously with the horizontal groove 45Y extending in the horizontal direction Y arranged in the first region 41F and the third region 41R of the absorbent core 41. Further, the vertical middle and high groove portion 43mx is formed on a straight line continuously with the vertical groove 45X extending in the vertical direction X arranged in the first region 41F and the third region 41R of the absorbent core 41. Similarly to the horizontal grooves 45Y and the vertical grooves 45X, the middle and high groove portions 43m of the absorbent core 41 are open to the skin facing surface side.

  As shown in FIG. 10, the absorbent core 41 is viewed in plan, and the plurality of high-density portions 47 are arranged in the central portion in the lateral direction Y of the high basis weight portion 42. In the napkin 1 including the absorbent core 41 shown in FIG. 10, the plurality of high density portions 47 are arranged in the central high basis weight portion 42BC of the high basis weight portion 42, and the central high basis weight of the high basis weight portion 42. It is preferable to arrange | position to each middle high part small absorption part 43k with which part 42BC is provided, and it is preferable to distribute | arrange to the position which does not overlap with the middle high part groove part 43m. In the napkin 1, the plurality of high density portions 47 are not arranged on the pair of side high basis weight portions 42 BS and 42 BS of the high basis weight portion 42. In this napkin 1, there exists an effect similar to napkin 1 provided with the absorptive core 41 shown in FIG. 3 mentioned above.

  Moreover, in the napkin 1 provided with the absorptive core 41 shown in FIG. 10, in the high-density part 47, both the skin side sheet | seat 2 and the absorptive core 41 have high density. Specifically, in the napkin 1, as shown in FIG. 11, each high-density portion 47 has the absorbent body 4 recessed in a concave shape together with the skin-side sheet 2, and the non-skin from the skin-facing surface side of the skin-side sheet 2. The skin side sheet 2 and the absorbent body 4 are formed to be consolidated toward the side sheet 3. Thus, both the skin-side sheet 2 and the absorbent core 41 have a higher density than the peripheral density. The napkin 1 has the same effect as the napkin 1 shown in FIG. 9 described above, and the density of the skin-side sheet 2 and the absorbent core 41 is increased at the high-density portion 47. The body fluid drawing force is improved, and the diffusibility of the body fluid in the absorbent core 41 is further improved.

  In the absorbent core 41 shown in FIG. 10, the central high basis weight portion 42BC extends from the intermediate section B to a part of the rear section C. It may extend over a part, may extend over a part of the front area A from the intermediate area B, and may extend over a part of the rear area C.

  Moreover, in the absorptive core 41 shown in FIG. 10, the several high-density part 47 is not distribute | arranged to a pair of side high basic weight part 42BS of the high basic weight part 42, 42BS, but a high basic weight part 42 is arranged in the central high basis weight portion 42BC, but may be arranged in the pair of side high basis weight portions 42BS, 42BS and the central high basis weight portion 42BC. Further, in the absorbent core 41 shown in FIG. 3, the plurality of high density portions 47 are distributed throughout the high basis weight portion 42, but the central portion in the lateral direction Y of the high basis weight portion 42. It may be arranged only in. Moreover, in the napkin 1 shown in FIG.9 and FIG.11, although the high-density part 47 is formed so that it may become depressed toward the non-skin opposing surface side from the skin opposing surface side, the high-density part 47 is formed from the non-skin opposing surface side. You may form so that it may become depressed toward the skin opposing surface side.

  Moreover, it may replace with the skin side sheet | seat 2 of the napkin 1, and may be provided with a uniform convex part as described in Unexamined-Japanese-Patent No. 2009-512, or a flat sheet | seat which does not have a convex part.

  Further, the absorbent core 41 of the napkin 1 is formed so that the groove portion 45 is recessed from the skin facing surface side toward the non-skin facing surface side, but the groove portion 45 is directed from the non-skin facing surface side to the skin facing surface side. It may be formed so as to be recessed. Thereby, liquid diffusibility and liquid retention are improved.

  In addition to the sanitary napkin, the absorbent article of the present invention may be a panty liner (cage sheet), an incontinence pad, or the like.

1 Sanitary napkin (absorbent article)
A Front section B Middle section C Rear section 2 Skin side sheet 2t Convex part 2t1 High convex part 21L High convex part row 2t2 Low convex part 22L Low convex part row 2E Embossed part 3 Non-skin side sheet 4 Absorber 41 Absorbent core 41F Absorbent core first region 41M Absorbent core second region 41R Absorbent core third region 42 High basis weight portion 421 Middle high central portion 422 Front convex portion 423 Rear convex portion 43 Middle high boundary groove 44 Middle high adjacent portion 45 groove part 46 small absorption part 47 high density part 5 side sheet 6 joint part 7 linear compression groove

Claims (5)

A skin-side sheet, a non-skin-side sheet, and an absorbent core interposed between the two sheets, and having a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular to the longitudinal direction, An absorbent article having a front area and a rear area,
The absorbent core has a second region between a first region located on the front region side and a third region located on the rear region side, and the second region includes the second region side. More than the basis weight on the third region side, and has a high basis weight part with a large basis weight,
The high basis weight portion is a plan view of the absorbent core, and the length of the high basis weight portion in the longitudinal direction is shorter than the length of the absorbent core in the longitudinal direction. The both side edges along the side extends to both side edges along the longitudinal direction of the absorbent core,
The high basis weight portion is a plan view of the absorbent core, and the length in the vertical direction at the center portion in the lateral direction is longer than the length in the vertical direction of the side edge of the high basis weight portion,
The absorbent article in which the high basis weight portion is provided with a plurality of high density portions separated from each other and having a high density of constituent fibers.   The absorptivity according to claim 1, wherein the high-basis weight portion has a portion in which a longitudinal length gradually decreases from a lateral central portion toward the side edge in a plan view of the absorbent core. Goods.   In plan view of the absorbent core, the plurality of high-density portions are arranged in a central portion in the lateral direction of the high basis weight portion, and in the high-density portion, the skin side sheet and the absorbent The absorbent article according to claim 1 or 2, wherein both the cores have a high density.   On the skin-facing surface of the skin-side sheet, a linear compression groove is formed in which the skin-side sheet and an absorbent body including the absorbent core are integrally recessed toward the non-skin-side sheet side. The absorbent article according to any one of claims 1 to 3.   The said skin side sheet | seat has multiple convex parts which protruded in the skin opposing surface side in the position which overlaps with the said high basic weight part of the said absorptive core. Absorbent article.

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