JP6457861B2 - Absorbent articles - Google Patents

Description

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

Conventionally, in an absorbent article having a long length in the longitudinal direction along the wearer's front-rear direction, such as a sanitary napkin suitable for use at bedtime, there is a gap between the skin of the wearer In the sleeping posture, the liquid may flow along the surface of the skin to the buttocks, leading to liquid leakage.
Therefore, a technique is known in which a thick part is formed on the absorbent body of the absorbent article and the middle and high parts are formed on the skin-facing surface, thereby improving the fit to the body (Patent Literature). 1 and 2). However, when the basis weight of the absorber is partially increased to form a middle-high portion, the middle-high portion has a high rigidity, is difficult to bend, or is strongly bent at one place. On the other hand, there was a case where a gap was likely to occur.
Moreover, in patent document 1, it divides the thick part formed in the absorber back and forth, makes it a bending origin by making it a high-density pressing part by processing, such as embossing, in the middle part, and between the body It has been proposed to reduce the gap, but it was insufficient as flexibility to fit the buttocks.

JP 2006-239162 A JP 2014-104094 A

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

  The present invention includes a skin-side sheet, a non-skin-side sheet, and an absorbent core having a shape that is long in the front-rear direction of the absorbent article, and is disposed between the two sheets and disposed opposite to the wearer's liquid excretion part. An absorbent article having a rear part disposed behind the excretory part opposing part and the excretory part opposing part, wherein the absorbent core has an excretory part raised region in the excretory part opposing part, and in the rear part It has a back bulge region at the center in the width direction, and each of the excretion region bulge region and the back bulge region is thicker than the surrounding portion, and the wearer's skin-facing surface of the absorbent article A middle-high part protruding toward the skin side is formed, and the thickness extends across the entire area in the width direction of the absorbent core between the excretory part raised area and the rear raised area in the absorbent core. , Thinner than the thickness of the excretory part raised area and the rear raised area An intermediate region is formed, a central lateral groove portion having a lower basis weight than the front and rear regions extending in the width direction of the absorbent core is formed in the excretory region raised region, and the intermediate region includes the An intermediate horizontal groove portion having a lower basis weight than the front and rear regions extending in the width direction through the space between the excretory portion raised region and the rear raised region is formed, and the intermediate horizontal groove portion is formed in the excretory portion raised region. And the rear ridge region, and the ratio of the area of the intermediate transverse groove portion to the area of the intermediate region is greater than the ratio of the area of the central transverse groove portion to the area of the excretory portion raised region It provides a sex product.

  According to the absorbent article of the present invention, the absorbability of the liquid by the middle and high parts formed by the excretory part raised area and the rear raised area, and the skin surface of the wearer in the intermediate area between the excreted part raised area and the rear raised area It is possible to reliably prevent leakage due to a gap between the skin and the wearer's skin.

FIG. 1 is a perspective view showing a sanitary napkin according to a first embodiment of the present invention. FIG. 2 is a perspective view showing an absorbent core of the sanitary napkin of FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a plan view of the absorbent core of the sanitary napkin of FIG. 1 as viewed from the skin facing surface side. 6 is a cross-sectional view showing a longitudinal section along the line VI-VI of FIG. 7 in the sanitary napkin shown in FIG. FIG. 7 is an enlarged plan view showing a part of the absorbent core shown in FIG. 5 in an enlarged manner. FIG. 8 is a schematic cross-sectional view showing a deformed state of the sanitary napkin shown in FIG. 1 when worn. 9 (a) and 9 (b) are schematic views showing a cross-section along the circumferential direction of the fiber drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 9A is a diagram illustrating a state before the absorbent core forming material is deposited in the accumulation recess, and FIG. 9B is a diagram illustrating a state in which the absorbent core forming material is deposited in the accumulation recess. FIG. 10 is a view corresponding to FIG. 7 of the absorbent core of the sanitary napkin of the second embodiment. Fig.11 (a)-FIG.11 (f) are top views which show the absorptive core in other embodiment of this invention. FIG. 12 is a graph showing the measurement results of stiffness for sanitary napkins of Examples and Comparative Examples.

The present invention will be described below based on preferred embodiments with reference to the drawings.
A sanitary napkin 1 (hereinafter also simply referred to as a napkin 1) according to a first embodiment of the present invention includes an absorbent main body 6 that is long in the front-rear direction X of the napkin 1 and a pair of wings as shown in FIG. It has the parts 7 and 7 and a pair of back flap parts 8 and 8. With respect to absorbent articles such as sanitary napkins, the “front-rear direction” is a direction that coincides with the wearer's front-rear direction when worn.
Napkin 1 has, at its front and rear direction X, the front portion A, discharge泄部opposing portions has B and rear station C, a pair of wing sections 7 on the left and right sides of the absorbent body 6 in discharge泄部facing portion B , 7, a pair of rear flap portions 8, 8 on the left and right sides of the absorbent main body 6 in the rear portion C, which is a napkin that is preferably used for so-called night use. The night napkin is assumed to be used at bedtime, and the total length is preferably 30 cm or more.

In the absorbent article of the present invention, the excretion portion facing section B, the center in the width direction, a portion of the liquid excretion portion of the wearer (vaginal opening or the like) is opposed, front portion A that exhaust泄部a portion that is disposed from the opposite part B wearer's front (ventral), rear part C is a portion which is arranged on the back side of the wearer than the discharge泄部facing portion B. When the excretory part facing part B has a wing part like the napkin 1 of the present embodiment, the wing part is arranged in the front-rear direction of the absorbent article (the same as the longitudinal direction of the absorbent main body, the X direction in the figure). It is the area | region (area | region pinched | interposed into the base of the one side of the front-back direction of a wing part, and the base of the other side). The excretion part opposing part in the absorbent article which does not have a wing part is the transverse direction (width direction of an absorbent article, in the figure) generated when the absorbent article is folded into a tri-fold individual form. The two folding lines (not shown) crossing in the Y direction) are areas surrounded by the first folding curve and the second folding curve counted from the front end in the longitudinal direction of the absorbent article. Moreover, in this specification, a skin opposing surface is a surface turned to a wearer's skin side at the time of wear in an absorbent article or its component, and a non-skin opposing surface is at the time of wear in an absorbent article or its component. It is a surface directed to the side opposite to the wearer's skin side (clothing side).

As shown in FIG. 3 or 4, the napkin 1 is disposed between the skin-side sheet 2 that forms the skin-facing surface, the non-skin-side sheet 3 that forms the non-skin-facing surface, and both the sheets 2 and 3. An absorbent core 4 is provided. The skin-side sheet 2 includes a liquid-permeable surface sheet 2a and a pair of three-dimensional guard forming sheets 2b and 2b joined to both sides thereof. The liquid permeable top sheet 2 a is arranged at the center in the width direction of the absorbent main body 6 so as to cover the entire length of the absorbent main body 6. The three-dimensional guard forming sheet 2 b has a folded portion 21 that is located on the center side in the width direction of the absorbent main body 6 and is folded outward, and is located outward in the width direction Y from the folded portion 21. It joins on the surface sheet 2a in the junction part 22. FIG. Stereoscopic guard forming sheet 2b has an elastic member 24 for stereoscopic guard formed in the vicinity of the side edge portion 23 forming a free end of the three-dimensional guard, when worn, the contraction force of the elastic member 24, discharge A space between the joint portion 22 and the side edge portion 23 in the excretory portion facing portion B stands up toward the wearer's skin to form the three-dimensional guard 10. The three-dimensional guard 10 can stand up at least in the existence area of the excretory part raised area 40 described later. In the napkin 1 of the present embodiment, in a part of the front part A and most of the rear part C , the three-dimensional guard forming sheet 2b is fixed to the top sheet side and is a non-standing part that does not stand up.

  The pair of wing portions 7, 7 and the pair of rear flap portions 8, 8 are composed of a three-dimensional guard forming sheet 2 b and a non-skin side sheet 3 extending from both side edges of the absorbent core 4. A wing portion adhesive portion 71 for fixing to the non-skin facing surface of the crotch portion of the shorts is provided on the surface made of the non-skin side sheet 3 of each of the pair of wing portions 7, and the non-skin facing surface of the absorbent main body 6 Is provided with a main body adhesive portion (not shown) for fixing the absorbent main body 6 to the inner surface of the shorts. The rear flap 8 is arranged on the inner surface of the shorts (surface directed to the skin side) when worn. It is preferable that an adhesive portion for fixing to the inner surface of the shorts is also provided on the surface of the rear flap portion 8 made of the non-skin side sheet 3. The skin-side sheet 2 and the non-skin-side sheet 3 are joined to each other with an adhesive from the periphery of the absorbent core 4 and are joined to each other at the periphery of the napkin 1 by heat sealing.

  The absorbent core 4 in the napkin 1 is composed of a fiber assembly made of a fiber material such as pulp fiber or a fiber assembly in which a superabsorbent polymer is held. The absorbent core 4 is covered with a core wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric to form an absorbent body. The core wrap sheet is used for the purpose of preventing leakage of the forming material of the absorbent core 4 or improving the shape retention of the absorbent core 4. Between the skin side sheet 2 and the core wrap sheet that covers the skin facing surface side of the absorbent core 4 and between the non-skin side sheet 3 and the core wrap sheet that covers the non skin facing surface side of the absorbent core 4. The gaps are preferably joined to each other by a pattern-coated adhesive such as dots, spirals or stripes.

As shown in FIG. 2, the absorbent core 4 in the napkin 1 has a shape that is long in the same direction as the front-rear direction X of the napkin 1. Therefore, the longitudinal direction of the absorbent core 4 is the same direction as the front-rear direction X of the napkin 1, and the width direction of the absorbent core 4 is the same direction as the width direction Y of the napkin 1. As shown in FIG. 5, the absorbent core 4 has a pair of side edges 4 s and 4 s extending in the longitudinal direction X, and an arcuate front edge 4 a and rear edge 4 c.
Moreover, as shown in FIG. 2, the absorptive core 4 has the excretion part protruding area | region 40 in the center part of the width direction Y in the excretion part opposing part B, and back bulge in the center part of the width direction Y in the back part C. As shown in FIG. A region 50 is included. The excretion part raised region 40 is thicker than the portion 43 surrounding the periphery, and the rear raised region 50 is also thicker than the portion 43 including the periphery.
Moreover, the excretion part protrusion area | region 40 and the back protrusion area | region 50 each protrude toward a wearer's skin side.

  And in the napkin 1, the center thick part 41 of the excretion part raising area | region 40 exists under the surface sheet 2a, Therefore In a width direction center part of the skin opposing surface in the excretion part opposing part B, a wearer's The front middle and high part 11 projecting toward the skin side is formed, and the presence of the rear raised region 50 below the top sheet 2a, the width direction central part of the skin facing surface in the rear part C, A rear middle high portion 12 that protrudes toward the wearer's skin is formed. It is preferable that the rear middle high portion 12 is disposed to face the wearer's crack when the napkin 1 is worn. The front middle-high part 11 and the rear middle-high part 12 are middle-high parts in the present invention, and protrude toward the wearer's skin side rather than the part surrounding each circumference.

As shown in FIGS. 2 and 5, the excretory portion raised region 40 in the napkin 1 of the present embodiment includes a central thick portion 41 having a vertically long plan view shape in the longitudinal direction X of the absorbent core, and a central thick portion. Side thick portions 42 and 42 bulging outward from both side edges along the longitudinal direction of the portion 41 are provided.
Between the central thick part 41 and the side thick parts 42 and 42 in the absorbent core 4, any basis weight of the central thick part 41 and the side thick parts 42 and 42 (basis weight of the core material). ) Has a lower basis weight, and a longitudinal groove portion 49 is formed by the low density portion. As shown in FIG. 1, the central thick portion 41 has linear side end edges 41 s and 41 s extending in the longitudinal direction X of the absorbent core 4, and the front end edge 41 a of the central thick portion 41. And the rear-end edge 41c becomes a shape where the length of the width direction Y reduces gradually toward the front and back. More specifically, the central thick portion 41 has an arcuate front end edge 41a and a rear end edge 41c, and has an oval plan view shape having a long axis in the longitudinal direction X as a whole. Yes.

  Although the excretion part protruding area 40 and the central thick part 41 may be formed only in the excretion part facing part B of the napkin 1, the excretion part facing part B as in the napkin 1 of this embodiment shown in FIG. In addition to being able to increase the amount of excretion absorbed, extending from the rear part of the rear part C, the distance that diffuses toward the rear part end is increased, not only in the longitudinal direction Further, the diffusion in the width direction is sufficiently generated, the diffusion rate in the longitudinal direction X can be suppressed, and leakage from the rear can be prevented. Moreover, the excretion part protruding area 40 and the central thick part 41 may extend from the excretion part facing part B to a part of the rear part C and to a part of the front part A.

The central thick portion 41 in the present embodiment is divided by a central lateral groove portion 44 extending in the width direction of the absorbent core 4 and a central vertical groove portion 46 extending in the longitudinal direction of the absorbent core 4, thereby the central thickness portion. A plurality of small absorbing portions 45 are formed in the portion 41. In the central thick part 41 in the present embodiment, five small absorbent parts 45 are arranged along the longitudinal direction X of the absorbent core 4, and the small absorbent parts 45 are arranged along the width direction Y of the absorbent core 4. Two pieces are arranged side by side, and a total of ten small absorbing portions 45 are formed.
In the absorptive core 4 of this embodiment, parts other than the excretion part raising area | region 40 and the back raising area | region 50 become the standard absorption area | region 43 whose thickness is substantially uniform. In the present embodiment, the standard absorption region 43 is located in front of the excretion region bulge region 40, a side portion sandwiching the excretion region bulge region 40, an intermediate region 60 described later, a side portion of the absorbent core sandwiching the rear bulge region 50, and It is distributed behind the rear raised region 50.

The thickness of the excretion portion raised region 40 is the thickness of a portion other than the groove portions (the central horizontal groove portion 44, the central vertical groove portion 46, the central horizontal groove portion 47, the vertical groove portion 49). For example, the thickness of the central thick portion 41 is small. It is the same as the thickness of the absorption part 45. As shown in FIG. 2, the absorbent core 4 in the present embodiment also has a transverse groove portion 43 a extending in the width direction Y of the absorbent core 4 and a longitudinal groove portion extending in the longitudinal direction X of the absorbent core 4 in the standard absorbent region 43. 43b is formed, but the thickness of the standard absorption region 43 compared with the thickness of the excretory portion raised region 40 and the rear raised region 50 is a thickness in a portion where there is no groove such as the lateral groove 43a and the vertical groove 43b. .
Moreover, when the leak-proof groove | channel which extends from the surface sheet 2a to the absorptive core 4 like the pressing groove 13 mentioned later is provided, the standard absorption area | region 43, a protruding area | region (excretion part protruding area | region 40, back protruding area | region 50) When measuring the thickness of each part of the absorbent core, such as the intermediate region 60, it is measured so as not to include such a leak-proof groove portion.

The thickness of the central thick part 41 is standard from the viewpoint of forming the front middle / high part 11 projecting toward the skin on the skin facing surface of the napkin 1 and improving the liquid absorbency and the like in the excretory part facing part B. The thickness of the absorption region 43 is preferably 120% (that is, 1.2 times) or more, more preferably 150% or more, preferably 500% or less, more preferably 200% or less, and wearing. From the viewpoint of suppressing the uncomfortable feeling at the time of wearing, the thickness of the standard absorption region 43 is preferably 120% to 500%, more preferably 150% to 200%.
The difference in thickness between the central thick portion 41 and the standard absorption region 43 (the former-the latter) is preferably 1.0 mm or more, more preferably 2.0 mm or more, and preferably 8.0 mm. In the following, it is more preferably 6 mm or less, preferably 1.0 mm or more and 8.0 mm or less, more preferably 2.0 mm or more and 6.0 mm or less. The preferable thickness ratio and the difference in thickness are the same for the thickness of the rear raised region 50 and the thickness of the standard absorption region 43.
In addition, it is preferable that the relationship of the thickness is in the entire range of the central thick portion 41, but in the case where the thickness of the central thick portion 41 is inclined, the above-mentioned thickness is increased in the thickest portion. It only has to be a relationship.

The thickness of each part of the absorbent core is measured by the following method. In addition, when the absorptive core is coat | covered with the core wrap sheet | seat like the napkin 1 of this embodiment, the thickness of each part of an absorptive core is the state in which this absorptive core is wrapped in the core wrap sheet | seat. taking measurement.
<Measurement method of thickness of each part of absorbent core>
The absorptive core which is a measurement object is left still in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Was used for measuring the thickness in the present invention. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in a plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  The side thick portions 42 and 42 are thicker than the thickness in the standard absorption region 43, similarly to the central thick portion 41. In the present embodiment, as shown in FIG. 2, a central lateral groove portion 47 extending in the width direction of the absorbent core 4 is formed in each of the lateral thick portions 42, 42, thereby laterally A plurality of small absorbing portions 48 are formed in each of the thick portions 42 and 42.

  The thickness of the side wall portion 42 is preferably 120% or more, more preferably 130% or more, and preferably 200% or less, more preferably 180% or less of the thickness of the standard absorption region 43. , Preferably 120% or more and 200% or less, more preferably 130% or more and 180% or less. Further, the difference in thickness between the thick side portion 42 and the standard absorption region 43 (the former-the latter) is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 8. It is 0 mm or less, more preferably 6.0 mm or less, preferably 1.0 mm or more and 8.0 mm or less, more preferably 1.5 mm or more and 6.0 mm or less. The thickness of the side thick part 42 when the side thick part 42 has the lateral groove 47 described above or the compressed groove 13 (pressed vertical groove 14 or the like) to be described later is that of the portion other than the groove and compressed groove. The thickness of the standard absorption region 43 which means thickness and is compared with the thickness of the side thick portion 42 is a thickness in a portion where there is no groove such as the lateral groove 43a and the vertical groove 43b.

  Similarly to the central thick portion 41, the rear raised region 50 is thicker than the thickness in the standard absorption region 43. In the present embodiment, as shown in FIG. 2, a rear lateral groove portion 51 extending in the width direction of the absorbent core 4 is also formed in the rear raised region 50, whereby a plurality of rear raised regions 50 are formed in the rear raised region 50. Small absorption parts 52, 52 are formed.

  The thickness of the posterior raised region 50 is such that an absorptive core is formed on the skin facing surface of the napkin 1 from the viewpoint of improving the fit to the body (preferably rupture) by forming a posterior middle / high portion protruding toward the skin. 4 of the standard absorption region 43 is preferably 120% or more, more preferably 150% or more, preferably 500% or less, more preferably 200% or less, and preferably 120% or more and 500%. % Or less, more preferably 150% or more and 200% or less. Further, the difference between the thickness of the rear raised region 50 and the thickness of the standard absorption region 43 (the former-the latter) is preferably 1.0 mm or more, more preferably 2.0 mm or more, and preferably 8.0 mm or less, More preferably, it is 6.0 mm or less, Preferably it is 1.0 mm or more and 8.0 mm or less, More preferably, it is 2.0 mm or more and 6.0 mm or less.

  The thickness of the rear raised area 50 when the rear raised area 50 includes the rear lateral groove 51 described above, the compressed groove 13 described later, and the like means the thickness of portions other than the groove and the compressed groove, and the rear raised area 50 The thickness of the standard absorption region 43 as compared with the thickness of is a thickness in a portion where there is no groove such as the lateral groove 43a and the vertical groove 43b.

  In the present embodiment, the excretory part raised region 40 and the rear raised region 50 are formed by increasing the basis weight of the absorbent core forming material (hereinafter also referred to as “core material”) as compared to the standard absorbent region 43. . That is, the portion other than the groove portion (the central lateral groove portion 44, the central vertical groove portion 46, the central horizontal groove portion 47, the vertical groove portion 49) in the excretion portion raised region 40 and the portion other than the groove portion (the rear lateral groove portion 51) of the rear raised region 50 are The basis weight of the core material is larger than the basis weight in the standard absorption region 43. The absorbent core 4 in the present embodiment provides a thickness difference by providing a difference in basis weight of the core material between the raised region (the excretory region raised region 40 and the rear raised region 50) and the portion surrounding each. Therefore, unlike the case where a thickness difference is provided by compressing a part of the absorbent core having a uniform basis weight, the absorbent core 4 is flexible as a whole.

Moreover, the part which forms the groove part (the central horizontal groove part 44, the central vertical groove part 46, the central horizontal groove part 47, and the vertical groove part 49) in the excretion part protrusion area | region 40 is a high basic weight part in the excretion part protrusion area | region 40 Compared with the part (small absorption part 45 and small absorption part 48), the basic weight of the core material is a low low basic weight part. Similarly, the part which forms the groove part (rear horizontal groove part 51) in the back bulge area 50 is a core material compared with the other part (small absorption part 52) which is a high basic weight part in the back bulge area 50. The basis weight is a low basis weight part with a relatively low basis weight.
The central lateral groove portion 44 has a lower basis weight in the longitudinal direction X of the absorbent core than the regions before and after the central lateral groove portion 44. More specifically, the central lateral groove portion 44 It is a low basis weight part in which the basis weight of the core material is relatively lower than the small absorbent part 45 positioned. Similarly, in the longitudinal direction X of the absorbent core, the central lateral groove portion 47 has a lower basis weight than the front and rear regions of the central lateral groove portion 47. More specifically, the central lateral groove portion 47 sandwiches the central lateral groove portion 47. It is a low basis weight part in which the basis weight of the core material is relatively lower than that of the small absorbent parts 48 located in the front and rear.

Moreover, in the napkin 1, as shown in FIG. 2, the thickness extends across the entire region in the width direction Y of the absorbent core 4 between the excretory region raised region 40 and the rear raised region 50 in the absorbent core 4. An intermediate region 60 that is thinner than the thickness of the excretory region raised region 40 and the rear raised region 50 is formed.
As shown in FIG. 7, the intermediate region 60 has a first imaginary straight line L4 that extends in the width direction Y of the absorbent core 4 through the rear end 40e of the excretory portion raised region 40 in a plan view of the absorbent core 4. This is a region between the second imaginary straight line L5 extending in the width direction Y of the absorbent core 4 through the front end 50e of the rear raised region 50, and is a region with parallel diagonal lines in FIG.

  As shown in FIGS. 6 and 7, the intermediate region 60 of the absorbent core 4 is also formed with a lateral groove portion 61 and a longitudinal groove portion 64 formed by reducing the core material. A plurality of small absorption parts 65 are formed by partitioning. That is, the portion of the intermediate region 60 where the groove portions (the horizontal groove portion 61 and the vertical groove portion 64) are formed is more core material than the other portion (small absorption portion 65) which is the high basis weight portion in the intermediate region 60. The basis weight is a low basis weight part with a relatively low basis weight. In the napkin 1 of the present embodiment, the groove portions 44, 46, 47, 49, 51, 61 described above are formed on the skin facing surface of the absorbent core 4, but on the non-skin facing surface side of the absorbent core 4. Is formed with a continuous layer 59 that is not divided by the grooves.

As shown in FIG. 7, the absorbent core 4 in the present embodiment has the three horizontal groove portions 61 described above formed in the intermediate region 60, and one horizontal groove portion 61 in the plan view of the absorbent core 4 includes The other excavation portion 61 is in contact with the excretion region protrusion region 40, and the other one of the lateral groove portions 61 is in contact with the rear protrusion region 50. The remaining one lateral groove portion 61 is separated from both the excretion portion raised region 40 and the rear raised region 50, and the one lateral groove portion 61 becomes the intermediate lateral groove portion 62 in the present embodiment. Yes.
The intermediate lateral groove portion 62 has a lower basis weight in the longitudinal direction X of the absorbent core than the region before and after the intermediate lateral groove portion 62. More specifically, the intermediate lateral groove portion 62 It is a low basis weight part in which the basis weight of the core material is relatively lower than the small absorption part 65 located.

As shown in FIG. 7, the intermediate lateral groove portion 62 in the present embodiment extends over the entire area in the width direction Y of the absorbent core in the intermediate region 60, and the other lateral groove portions 61 formed in the intermediate region 60 similarly. In the intermediate region 60, the absorbent core extends over the entire region in the width direction Y.
The intermediate lateral groove portion 62 in the present invention only needs to be at least partially between the excretory portion raised region 40 and the rear raised region 50, but the intermediate lateral groove portion 62 extends in the width direction Y of the absorbent core 4. The length along the direction is preferably 50% or more of the total length of the absorbent core 4 in the intermediate region 60 in the same direction, more preferably 75% or more, and the absorbent core 4 as in this embodiment. The rigidity of the intermediate region 60 is lower than that of the excretory region raised region 40 and the rear raised region 50, and the napkin 1 (absorbent article) is made more flexible, This is more preferable from the viewpoint of making it easier to follow the shape of the skin surface. Further, the intermediate lateral groove portion 62 is located so as to be separated from the excretory portion raised region 40 and the rear raised region 50, and is disposed so as to pass through a center line that bisects the entire width of the intermediate region 60. It is preferable in that it has both liquid absorbency and ease of conforming to the shape of the skin surface of the wearer, and more reliably prevents leakage due to the formation of a gap between the skin of the wearer.

The absorbent core 4 in the napkin 1 of the present embodiment has a ratio of the area (S2) of the intermediate lateral groove 62 to the area (S1) of the intermediate region 60 (S2 / S1, hereinafter also referred to as “area ratio of the intermediate lateral groove”). Is the ratio of the area (S4) of the central lateral groove part (the central lateral groove part 44 and the central lateral groove part 47) to the area (S3) of the excretion part raised region 40 (S4 / S3, hereinafter also referred to as “area ratio of the central lateral groove part”). Larger than).
The area of the intermediate region 60 includes the areas of the grooves formed in the intermediate region 60, that is, the horizontal grooves 61 and the vertical grooves 64. The area of the intermediate horizontal groove 62 is calculated by multiplying the width of the opening by the length of the intermediate horizontal groove 62 (length in the extending direction), and includes the area of the portion that intersects the vertical groove 64.
Similarly, the area of the excretion part raised region 40 includes the areas of the grooves (the central lateral groove part 44, the central longitudinal groove part 46, the central lateral groove part 47, and the longitudinal groove part 49) formed in the excretion part raised region 40. The area of the central lateral groove portion is the sum of the areas of the lateral groove portions formed in the excretion portion raised region 40, and includes both the area of the central lateral groove portion 44 and the area of the central lateral groove portion 47 in this embodiment. It is an area.

According to the napkin 1 of the present embodiment, the area ratio of the intermediate lateral groove portion is larger than the area ratio of the central lateral groove portion, and the ratio of the intermediate lateral groove portion 62 occupying the intermediate region 60 is large. Therefore, as shown in FIG. The sex core 4 has lower rigidity near the intermediate region 60, and the skin surface of the wearer is also present at a portion having a relatively small radius of curvature located near the boundary between the liquid excretion part E and the heel part H of the wearer M. It is easy to deform into a shape along. Therefore, it is hard to produce a clearance gap between a wearer's skin between the front middle high part 11 formed by the excretion part raised area 40, and the rear middle high part 12 formed by the back raised area 50. Moreover, the front middle high part 11 formed by the excretion part protrusion area | region 40 fits the wearer's M liquid excretion part E vicinity flexibly, and the excreted liquid is rapidly absorbed by the excretion part protrusion area | region 40. FIG. Moreover, the back middle high part 12 formed by the back bulging area | region 50 fits flexibly in the vicinity of the crack of the heel part H, and the liquid which flowed back along the wearer's skin surface is absorbed by the back bulging area 50. The
Thus, the napkin 1 of this embodiment combines the absorbability of the liquid by the middle and high parts formed by the excretory part raised area and the rear raised area, and the flexibility in the intermediate area, and the wearer's skin. Leakage caused by a gap between them can be reliably prevented.
Further, by arranging the intermediate lateral groove 62 between the excretory part raised region 40 and the rear raised area 50, adhesion to the skin is enhanced, and even when the excretory part raised region 40 extends to the rear part C. Since the excretion region raised region 40 is prevented from being unexpectedly deformed, the diffusion rate of the excretion liquid to the rear of the napkin is reliably suppressed, and the performance of suppressing rear leakage is enhanced.

From the viewpoint of ensuring such an effect, the intermediate transverse groove 62 has a length L2 along the longitudinal direction X of the absorbent core 4 of preferably 0.5 mm or more, more preferably 1.0 mm. From the viewpoint of preventing the liquid from being guided in the lateral direction due to the intermediate lateral groove 62 being too wide and the lateral leakage resulting therefrom, the length L2 is preferably 4.0 mm or less, more preferably 3 0.0 mm or less. When the length L2 is not constant in the width direction Y of the absorbent core 4, the length L2 is the center in the width direction of the absorbent core 4 where the excretory part raised region 40 and the rear raised region 50 face each other. Measure the length of the area that does not intersect the longitudinal groove.
The intermediate region 60 has a length L6 along the longitudinal direction of the absorbent core 4 of preferably 5.0 mm or more, more preferably 10 mm or more, and preferably 45 mm or less, more preferably 40 mm or less. Moreover, Preferably they are 5.0 mm or more and 40 mm or less, More preferably, they are 10 mm or more and 40 mm or less.

  Moreover, it is preferable that the said length L6 of the intermediate | middle area | region 60 is shorter than the length of the excretion part protrusion area | region 40 and the back protrusion area | region 50 of the same direction. The length of the rear raised region 50 along the longitudinal direction of the absorbent core 4 is preferably 1.1 to 2.1 times, more preferably 1.4 to 1 times the length L6 of the intermediate region 60. .8 or less. Moreover, it is preferable that the length of the absorbent core 4 in the longitudinal direction of the excretory part raised region 40 is longer than the length of the rear raised region 50 in the same direction, and 10% of the total length of the absorbent core 4 in the same direction. It is preferably 70% or less and more preferably 30% or more and 50% or less.

Further, the area ratio (S2 / S1) of the intermediate lateral groove is preferably 0.01 or more, more preferably 0.02 or more, and preferably 0.70 or less, more preferably 0.50 or less, Further, it is preferably 0.01 or more and 0.70 or less, and more preferably 0.02 or more and 0.50 or less. Further, the area ratio (S4 / S3) of the central lateral groove is preferably 0.01 or more, more preferably 0.02 or more, and preferably 0.12 or less, more preferably 0.10 or less, Moreover, it is preferably 0.01 or more and 0.12 or less, more preferably 0.02 or more and 0.10 or less. Further, the ratio [ (S2 / S1) / (S4 / S3) ] of the area ratio (S2 / S1) of the intermediate lateral groove part and the area ratio (S4 / S3) of the central lateral groove part is preferably 1.05 or more. More preferably, it is 1.10 or more, preferably 10.0 or less, more preferably 8.50 or less, preferably 1.05 or more and 10.0 or less, more preferably 1.10 or more and 8.50. It is as follows.
Further, the area ratio (S6 / S5) of the rear lateral groove is preferably 0.01 or more, more preferably 0.02 or more, and preferably 0.10 or less, more preferably 0.08 or less, Further, it is preferably 0.01 or more and 0.10 or less, and more preferably 0.02 or more and 0.08 or less.

Further, from the viewpoint of improving the flexibility of the intermediate region 60 and its vicinity, the depth of the intermediate lateral groove 62 is preferably 0.5 mm or more, more preferably 1 mm or more, and continuous as the absorbent core 4. From the viewpoint of improving the flexibility of the intermediate region 60 and its vicinity while maintaining the properties, the depth is preferably 20% to 80%, more preferably 30% to 60% of the thickness of the intermediate region 60. It is as follows. The thickness of the intermediate region 60 is the thickness of the portion other than the groove portion, and is measured in the same manner as the method for measuring the thickness of the excretory portion raised region described above. The depth of the intermediate lateral groove portion 62 is the thickness of the excretion portion raised region. Observe and measure the cut surface of the absorbent core under the same load as the measurement.
In addition, in the napkin 1 of 1st Embodiment, the thickness of the intermediate | middle area | region 60 is the same as the thickness of the standard absorption area | region 43, and the low basic weight part which forms all the groove parts of the absorptive core 4 is used. The thickness is the same. Moreover, the thickness of the low basic weight part which forms each groove part is the distance between the bottom part of this groove part, and the surface by the side of the non-skin opposing surface of an absorptive core.

According to the napkin 1 of this embodiment, the absorbent core 4, exhaust泄部the facing portion B, excretory raised region consisting of the side thick parts 42 Metropolitan positioned and on both sides of the central thick portion 41 40, the portion having the central thick portion 41 fits into the wearer's liquid excretion part, and excretion fluid such as menstrual blood excreted from the liquid excretion part is rapidly absorbed. In addition, when the napkin 1 is fixedly attached to clothing such as shorts, the center line extending in the front-rear direction of the body of the napkin 1 and the center line extending in the longitudinal direction of the central thick portion 41 do not coincide with each other. However, the presence of the side thick portions 42 and 42 makes it easier to suppress leakage from the width direction, and the side thick portion 42 is firmly attached to the excretory portion facing portion B, so that sufficient absorption is achieved. Performance is manifested, and inconveniences such as a decrease in absorption performance due to excretion points are less likely to occur.

Further, due to the presence of the side thick portions 42, 42, both sides of the absorbent core 4 and both sides of the absorbent main body 6 can be applied even when the wearer's thighs receive pressure from the left and right sides during wearing. Is less likely to be twisted, and the absorbent core 4 shrinks so as to wave in the width direction, or irregular wrinkles occur, resulting in a decrease in the volume of liquid that can be absorbed, a decrease in fit to the body, and an uncomfortable feeling. Occurrence is difficult to occur.
As described above, according to the sanitary napkin 1 of the present embodiment, sufficient absorption performance is exhibited even if the mounting position is slightly shifted, and twisting hardly occurs, and inconveniences such as a sense of incongruity and liquid leakage hardly occur.

  Moreover, in the napkin 1 of this embodiment, since the center thick part 41 has the groove parts 44 and 46 and is divided | segmented into the some small absorption part 45, it fixes to clothes, such as shorts of the napkin 1, and fixes. When attached, it deforms flexibly. And since the groove parts 44 and 46 are provided in the central thick part 41 by providing the low basic weight part of the basic weight lower than the basic weight of the core material in the small absorption part 45, the central thick part 41 is Compared with the case of having a groove portion formed by compression by embossing or the like, it functions not only as a bend along the groove but also as a bent portion that is flexibly deformed with a high degree of freedom. Thereby, the sanitary napkin 1 becomes more excellent in the followability with respect to a wearer's operation | movement.

  Moreover, since the side thick part 42 has the groove part 47 and is divided | segmented into the some small absorption part 48, it is possible to carry out a flexible deformation | transformation also in the right-and-left both sides in an excretion part opposing part. Moreover, since the groove portion 47 is formed on the side thick portion 42 by providing a low basis weight portion having a basis weight lower than the basis weight of the core material in the small absorbent portion 48, the side thickness portion 42 is Compared to the case where the groove portion is formed by compression by embossing or the like, it is possible to transmit the force applied from the wearer in the width direction obliquely outward to the central thick portion 41 while buffering the force from the outside in the width direction. Therefore, it is possible to suppress discomfort because it is bent and brought into contact with the wearer's skin with an appropriate force while preventing the center thick portion 41 from being twisted. Thereby, the sanitary napkin 1 becomes more excellent in absorption performance while giving a followability to the wearer's movement and a soft wearing feeling.

  Moreover, since the back protruding area | region 50 has the groove part 51 and is divided | segmented into the some small absorption part 52, the back protruding area | region 50 can deform | transform flexibly. Moreover, since the groove 51 is formed by providing the rear raised region 50 with a low basis weight having a basis weight lower than the basis weight of the core material in the small absorbent portion 52, the rear raised region 50 has the groove 51. Compared to the case where the groove portion is not formed or has a groove portion formed by compression by embossing or the like, the portion functions not only as a bend along the groove but also as a bent portion which is flexibly deformed with a high degree of freedom. Thereby, the sanitary napkin 1 becomes more excellent in the fitting property to a wearer's skin, and the followable | trackability with respect to a wearer's operation | movement.

  Moreover, in the napkin 1 of this embodiment, the back protrusion area | region 50 has the back horizontal groove part 51 formed by providing the low basic weight part of a low basic weight rather than the small absorption part 52 which is a high basic weight part. The area ratio (S2 / S1) of the intermediate lateral groove portion described above is the ratio of the area (S6) of the rear lateral groove portion 51 to the area (S5) of the rear raised region 50 (S6 / S5, hereinafter “the rear lateral groove portion It is also larger than “area ratio”. Thereby, the effect of the present invention is more reliably exhibited.

  As shown in FIG. 1, the surface sheet 2 a that is the skin side sheet 2 and the absorbent core 4 are non-skin on the skin facing surface (surface on the surface sheet 2 a side) of the absorbent main body 6 in the napkin 1 of the present embodiment. A pressing groove 13 that is integrally recessed toward the side sheet 3 side is formed, and the pressing groove 13 extends along the longitudinal direction X of the absorbent core 4 on both outer sides of the central thick portion 41. Between the squeezing longitudinal groove 14, the front squeezing groove 15 and the rear squeezing groove 16 formed in the front part A and the rear part C so as to extend in the lateral direction Y, respectively, between the central thick part 41 and the rear bulge region 50. The intermediate compressed groove 17 is formed in the intermediate region 60 so as to extend in the width direction Y. The pressing groove is formed by pressing (so-called embossing) with or without heat. In the pressing groove, the topsheet 2a and the absorbent core 4 are integrated (coupled). The napkin 1 and the absorbent core 4 of the present embodiment are formed symmetrically with respect to a longitudinal center line (not shown) that bisects the absorbent core 4 in the width direction Y.

And in the napkin 1 of this embodiment, a pair of pressing vertical grooves 14 and 14 as the pressing grooves 13 in which the surface sheet 2a (skin-side sheet 2) and the absorbent core 4 are compressed and integrated are respectively described above. The lateral thick portions 42 and 42 are formed so as to be longitudinally cut in the longitudinal direction X of the absorbent core 4.
Since the compressed vertical grooves 14 and 14 cut the side thick portions 42 and 42 vertically, the above-described twist is less likely to occur on both sides of the absorbent core 4 and both sides of the absorbent main body 6. Moreover, generation | occurrence | production of the twist by the force added toward the inner side from the width direction outer side at the time of wear with respect to the center thick part 41 and excessive pressing force to skin can be suppressed. The compressed vertical grooves 14 are not limited to those completely parallel to the longitudinal direction X of the absorbent core 4. Further, as shown in FIG. 1, the intermediate compressed lateral groove 17 has a shape curved convexly toward the rear, and the central thick portion 41 has formed compressed grooves on the front, rear, left and right. The intermediate compression transverse grooves 17, that are formed so as to pass between the intermediate lateral groove 61 and 62 is desirable from the viewpoint of easily along the shape of the skin surface more wearer. What is necessary is just to set the width | variety (length of the direction orthogonal to a length direction) and depth of a pressing groove similarly to the pressing groove in this kind of absorbent article. The pressing groove is not limited to a straight line in a plan view, and the pressing groove may include a curved line, and the pressing groove may be composed of a row of many discontinuous point embosses. good.

  Moreover, the whole absorptive core 4 in this embodiment 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 absorbent core 4 preferably has a continuous layer 59 that is not divided by the grooves on the non-opening side opposite to the side where the grooves open, from the viewpoint of absorption performance and strength of the absorbent core. .

As shown in FIG. 9A, the absorbent core 4 of the napkin 1 described above has a stacking recess 55 on the outer peripheral surface, and rotates in one direction R, and the outer periphery of the stacking drum 54 It can be manufactured using a fiber stacking device provided with a duct (not shown) for supplying the core material in a scattered state on the 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. 9A, two concave portions 56 b and 56 c for forming the excretory portion raised region 40 and the rear raised region 50 are formed on a part of the bottom surface 56 of the accumulation concave portion 55. Yes. Further, at the bottom of the concave portion 56b, a non-breathable member 57 for forming the groove portion 44 in the excretion portion raised region 40 and a similar breathability for forming the groove portions 46, 47, 49 in the excretion portion raised region 40. A member (not shown) is arranged. Further, a breathable member 57 for forming the groove 51 in the rear raised region 50 is disposed at the bottom of the recess 56c.
Further, a non-breathable member 58 for forming the groove portions 43a, 43b, 61, 64 is formed on the bottom surface 56 of the accumulation concave portion 55 other than the concave portions 56b, 56c. The non-breathable members 57 and 58 are fixed so as to protrude from the bottom surface of the accumulation recess 55, and may be non-breathable members, for example, made of metal, plastic, ceramic, or the like.

  As shown in FIG. 6B, by supplying a core material such as pulp fiber into the duct while sucking from the bottom surface of the accumulation concave portion 55, as in a known fiber pile device including a fiber pile drum. In addition, the core material is deposited in a predetermined shape in the accumulation recess 55. The absorbent core 4 is obtained by releasing the deposit 400 from the accumulation recess 55. The absorbent core 4 is pressed and compressed appropriately by passing between a pair of rolls before or after coating with the core wrap sheet. As a result, the portion made of the core material deposited on the air-impermeable member in the recess 56b becomes the groove portions 44, 46, 47, 49 having a relatively small basis weight and density, and the air-impermeable member in the recess 56b is reduced. The portions accumulated on the bottom surface that do not have become small absorbing portions 45 and 48 having a relatively large basis weight and density. Further, the portion made of the core material deposited on the breathable member in the recess 56c becomes the groove portion 51 having a relatively small basis weight and density, and deposited on the bottom surface of the recess 56c that does not have the breathable member. A part becomes the small absorption part 52 with relatively large basic weight and density. Similarly, in the portions other than the concave portions 56b and 56c, the portions made of the core material deposited on the air-impermeable member 58 become the groove portions 43a, 43b, 61, and 64 having relatively small basis weight and density, and the air permeability is difficult. The portion deposited on the bottom surface without the elastic member 58 becomes the small absorption portion 65 of the standard absorption region 43 or the small absorption portion 65 of the intermediate region, which has a relatively large basis weight and density. When manufacturing the absorptive core containing a water absorbing polymer, it is preferable to provide the introduction part of a water absorbing polymer in the middle of a duct.

As the surface sheet 2a, the three-dimensional guard forming sheet 2b, and the non-skin side sheet 3, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the top sheet 2a, a liquid-permeable nonwoven fabric or a perforated film can be used. As the non-skin side sheet 3, a water-repellent nonwoven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. Further, as the three-dimensional guard forming sheet 2b, a water-repellent nonwoven fabric having a high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used.

Next, the sanitary napkin of 2nd Embodiment of this invention is demonstrated. About the sanitary napkin of 2nd Embodiment, a different point from 1st Embodiment is demonstrated and description is abbreviate | omitted about the same point. The points that are not particularly described are the same as those of the napkin 1 of the first embodiment, and the same components are denoted by the same reference numerals.
The absorbent core 4 of the sanitary napkin of the second embodiment has an intermediate lateral groove 62A having the form shown in FIG. The intermediate lateral groove portion 62A shown in FIG. 10 has a narrow width portion 62a extending in the width direction Y of the absorbent core 4 between the excretion portion raised area 40 and the rear raised area 50, and the absorbency more than the narrow width portion 62a. A pair of low basis weight recesses 62b located near the end 4s in the width direction of the core 4 and whose length Lb in the longitudinal direction X of the absorbent core is longer than the length La in the same direction of the narrow width portion 62a. , 62b.
The narrow portion 62a has the same configuration as the intermediate transverse groove 62 in the napkin 1 of the first embodiment, and preferable values of the length La and the depth along the longitudinal direction X of the absorbent core 4 are the values in the first embodiment. It is the same as that of the intermediate | middle horizontal groove part 62 of a form.

  In the low basis weight recesses 62b and 62b constituting a part of the intermediate lateral groove 62A, the length Lb in the longitudinal direction X of the absorbent core 4 is five times or more the length La in the same direction of the narrow width portion 62a. Preferably, it is 10 times or more, preferably 1000 times or less, more preferably 200 times or less. The low basis weight recess 62b located in the intermediate region 60 has a length Lb in the longitudinal direction X of the absorbent core 4 with the length L6 in the same direction X of the intermediate region 60 as an upper limit, preferably 20 mm or more, more preferably It is 200 mm or more. Moreover, the low basic weight recessed part 62b has the length of the width direction Y of the absorptive core 4 larger than all the vertical groove parts formed in the absorptive core 4, Preferably it is 4 mm or more, More preferably, it is 10 mm or more. The low basis weight recess 62b is such that the length in the width direction Y of the absorbent core 4 is preferably 6% or more, more preferably 12% or more of the entire length in the width direction of the absorbent core 4 in the intermediate region 60. In addition, it is preferably 30% or less, more preferably 20% or less.

Also in the sanitary napkin of the second embodiment, the area ratio (S2 / S1) of the intermediate lateral groove portion is larger than the area ratio (S4 / S3) of the central lateral groove portion. Therefore, the same effect as the napkin 1 of 1st Embodiment is acquired. Furthermore, the rigidity in the vicinity of the intermediate region 60 is reduced, and the fitability and follow-up deformability to the body shape of the absorbent core 4 and the sanitary napkin including the absorbent core are further improved.
Also in the second embodiment, it is preferable that the area ratio (S2 / S1) of the intermediate lateral groove portion is larger than the area ratio (S6 / S5) of the rear lateral groove portion. In the second embodiment, the total area of the area of the narrow width portion 62a and the area of the pair of low basis weight recesses 62b located in the intermediate region 60 is the area (S2) of the intermediate lateral groove portion 62A.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, the low basis weight recesses similar to the low basis weight recesses 62b in the napkin of the second embodiment are the both end edges 4a and 4c in the longitudinal direction X of the absorbent core 4, that is, the front end edge 4a and the rear end edge 4c (FIG. 5). It is also preferred that it extends to (see). The low basis weight recessed part 62b in 2nd Embodiment is formed so that the side edges 4s and 4s of the absorptive core 4 may be contact | connected, and three sides, front and back, left, or right side are surrounded by the part thicker than it. However, when the low basic weight concave portion similar to the low basic weight concave portion 62b is extended to both end edges 4a, 4c in the longitudinal direction X of the absorbent core 4, only the left or right side of the low basic weight concave portion There will be a thick part. In that case, it is included in the low basis weight recess.

  Since the low basic weight recessed part similar to the low basic weight recessed part 62b extends to both end edges in the longitudinal direction X of the absorbent core 4, the flexibility of the absorbent core 4 is further improved. In addition, when a user fixes an absorbent article such as a sanitary napkin to shorts or the like, the side portion of the absorbent core 4 is often picked, and the thickness of the product is reduced by thinning the side portion. Can improve the product value.

  Moreover, although the low basic weight recessed part 62b in the napkin of 2nd Embodiment was formed so that the side edges 4s and 4s of the absorptive core 4 might be contacted, the low basic weight recessed part 62b was used as the side edge of the absorptive core 4. It can also be formed away from 4s and 4s. In this case, the low basis weight recess 62b is surrounded by a portion thicker than the portion in the front and rear and the left and right sides.

  Moreover, the excretion part protrusion area | region 40 in the napkin of 1st and 2nd embodiment is the center thick part 41 of the shape long in the longitudinal direction of the absorptive core 4, and the both-sides edge along the longitudinal direction of the center thick part 41, respectively. However, the excretory part raised region 40 in the present invention is composed only of the central thick part 41 in the napkin of the first or second embodiment. It may be a thing. Further, the plan view shapes of the central thick portion 41 and the side thick portions 42 may be shapes as shown in FIGS. The rear end edge 41c of the central thick part 41 constituting the whole or part of the excretory part raised region 40 is linear along the width direction Y of the absorbent core 4 as shown in FIG. Also good. Further, the rear raised region 50 may be oval or elliptical, and the front edge of the rear raised region 50 is formed in a convex arc shape toward the front in the same manner as the front edge of the excretory portion raised region 40. May be. Further, as shown in FIG. 11B, the elliptical or elliptical central thick portion 41 may have different radii of curvature at the front end edge 41a and the rear end edge 41c in the longitudinal direction. Moreover, as shown in FIG.11 (c), edge parts other than the edge part along the side edge of the center thick part 41 may be formed in the side thick part 42 in circular arc shape. Moreover, as shown in FIG.11 (d), the absorptive core 4 may not have the vertical groove part 49 between the center thick part 41 and the side thick part 42, for example. In that case, the part which extends from the arcuate or linear side edge along the longitudinal direction of the absorbent core 4 of the central thick part 41 can be used as the side thick part 42. A portion where the basis weight or the thickness changes can be a boundary between the central thick part 41 and the side thick part 42. Moreover, as shown in FIG.11 (e), the side thick part 42 may be rectangular shape. Moreover, a pair of side thick part 42 may be formed in any one edge part of the longitudinal direction X of the central thick part 41, for example, the front end part of the central thick part 41 [FIG.11 (f). reference〕.

Further, the central thick portion 41 is divided forward and backward by one or a plurality of central lateral groove portions 44, while the lateral thick portion 42 is not divided forward and backward by the central lateral groove portion 47. May be. Further, the rear raised region 50 may also be one that is not divided forward and backward by the rear lateral groove 51.
Moreover, the central thick part 41 does not need to be divided | segmented into the right and left by the central vertical groove part 46, and the back protruding area | region 50 may be divided | segmented into right and left by the vertical groove part along a longitudinal direction.
Moreover, in the sanitary napkin of 1st and 2nd embodiment, the groove part 43a extended in the width direction of an absorptive core and an absorptive core in parts other than the excretion part protruding area | region 40 and the back bulging area | region 50 of the absorptive core 4 Although the groove part 43b extended in the longitudinal direction is formed, one or both of them can be eliminated. Moreover, the horizontal groove part 61 other than the vertical groove part 64 and the intermediate horizontal groove part 62 in the intermediate | middle area | region 60 can also eliminate one or both of them.

  The thickness of the side thick part 42 may be the same as or different from that of the central thick part 41, but is preferably equal to or less than the thickness of the central thick part 41. The side thick portion 42 may have the same or different basis weight of the core material as the central thickness portion 41, but the core material has a lower basis weight than the central thickness portion 41. It is preferable that it is below the basic weight of the part 41.

  Moreover, an absorptive core may consist only of fiber materials, such as a pulp fiber, and may contain both a fiber material and a super absorbent polymer. As the fiber material, various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, and disposable diapers can be used without particular limitation. For example, pulp fibers, rayon fibers, cotton Short fibers of cellulosic fibers such as fibers, short fibers of synthetic fibers such as polyethylene, and the like are used. These fibers can be used alone or in combination of two or more. Moreover, it is preferable that the fiber material is entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%. In addition to the superabsorbent polymer, the absorbent core may contain a deodorant or an antibacterial agent as necessary.

Moreover, the absorptive core in this invention may not have any one or more of the pressing vertical groove 14, the front pressing groove 15, the back pressing groove 16, and the intermediate pressing horizontal groove 17. Further, the intermediate compressed lateral groove 17 may partially overlap with the intermediate lateral groove portion 62 or may not have a portion overlapping with the intermediate lateral groove portion 62.
Moreover, the excretion part protruding area | region may be formed by laminating | stacking the small absorbent structure manufactured separately in a part of large absorbent structure with uniform thickness.
Moreover, as for the absorptive core in the sanitary napkin of 1st and 2nd embodiment, groove parts, such as the center lateral groove part 44, the intermediate | middle lateral groove part 62, and the back lateral groove part 51, are the upper surface side (skin side sheet | seat side) of an absorptive core. However, the absorbent core according to the present invention has grooves such as a central lateral groove portion, an intermediate lateral groove portion, and a rear lateral groove portion that are open on the lower surface side (non-skin side sheet side) of the absorbent core. It may be what you are doing.

In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, and disposable diapers.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not restrict | limited at all by such an Example.
Example 1
A sanitary napkin having the form shown in FIG. 1 including the absorbent core 4 having the form shown in FIGS. 2, 4 and 5 was produced. As the absorbent core 4, a mixed fiber containing 95% by mass of wood pulp and 5% by mass of the absorbent polymer manufactured by the method described above was used. The absorbent core 4 was wrapped with a core wrap sheet and disposed between the skin side sheet 2 and the non-skin side sheet 3.
The thickness of the excretory part raised region 40 (the thickness of the central thick part 41), the thickness of the side thick part 42 of the excretory part raised region 40, and the thickness of the rear raised region 50 are 8.0 mm and 6.0 mm in this order. 8.0 mm, and the thickness of the intermediate region 60 and the standard absorption region 43 was 4.0 mm. The groove portions formed in the absorbent core 4 were each 2.0 mm in length (the intermediate lateral groove portion 62 is the length L2) orthogonal to the extending direction of the groove portions. Further, the groove formed in the intermediate region 60 and the standard absorption region 43 has a depth of 2.0 mm, and the groove formed in the central thick portion 41 and the rear raised region 50 has a depth of 6.0 mm. The groove part formed in the side thick part 42 had a depth of 4.0 mm.
In addition, the central thick part 41, the side thick part 42, the intermediate region 60, the rear raised region 50, and the absorbent core 4 have lengths along the longitudinal direction X of the absorbent core 4 of 130 mm and 60 mm, respectively. 25 mm, 40 mm, and 370 mm. Further, the absorbent core 4 had a length in the width direction Y (same as the length of the intermediate lateral groove portion) of 80 mm.
Further, the area ratio (S2 / S1) of the intermediate lateral groove part is 0.08, the area ratio (S4 / S3) of the central lateral groove part is 0.05, and the area ratio (S6 / S5) of the rear lateral groove part is 0.05. there were.

The following were used as the surface sheet 2a, the three-dimensional guard forming sheet 2b, the non-skin side sheet 3, and the core wrap sheet.
Top sheet 2a: air-through nonwoven fabric with basis weight of 30 g / m ²
Stereoscopic guard forming sheet 2b: basis weight 20 g / m @ 2 nonwoven non-skin side sheet 3: a basis weight of 25 g / ^{m 2} of moisture impermeable polyethylene film core wrap sheets: basis weight 16g / ^{m 2} of absorbent paper

(Example 2)
A sanitary napkin having the same configuration as that of Example 1 was manufactured except that the configuration of the intermediate region 60 of the absorbent core was changed to the configuration of the second embodiment. The length La of the narrow width portion 62a was 2 mm, and the length Lb of the low basis weight recess 62b was 25 mm. In the intermediate region 60, the length in the width direction Y of the absorbent core 4 is 80 mm, the length in the same direction of the narrow portion 62a is 80 mm, and the length in the same direction of each of the pair of low basis weight recesses is 80 mm. there were. In the intermediate region 60 of the absorbent core, the basis weight of the low basis weight recess 62b is 160 g / m ² and the basis weight of the portion excluding the intermediate lateral groove 62A including the low basis weight recess 62b and other grooves is 230 g / m ^2. It was.

(Example 3)
A sanitary napkin was obtained in the same manner as in Example 2 except that the low basis weight recess 62b was extended to both end edges in the longitudinal direction of the absorbent core 4.
For the sanitary napkins of Examples 2 and 3, the area ratio (S2 / S1) of the intermediate lateral groove part is 0.40, the area ratio of the central lateral groove part (S4 / S3) is 0.06, and the area ratio of the rear lateral groove part (S6 / S5) was 0.05.
(Example 4)
A sanitary napkin having the same configuration as in Example 1 was manufactured except that the portion of the intermediate compressed lateral groove 17 located in the center portion in the width direction Y of the absorbent core 4 overlapped with the intermediate lateral groove portion 62. .

(Comparative Example 1)
A sanitary napkin having the same configuration as that of the sanitary napkin of Example 1 was used as a comparative example, except that the absorbent core did not have an intermediate lateral groove in the intermediate region. For the sanitary napkin of Comparative Example 1, the area ratio (S2 / S1) of the intermediate lateral groove part is 0, the area ratio of the central lateral groove part (S4 / S3) is 0.06, and the area ratio of the rear lateral groove part (S6 / S5) ) Was 0.05.

(Evaluation)
About the sanitary napkin of an Example and a comparative example, it is centered on the position of the middle area | region center line CL (refer FIG. 7) which divides the middle area | region 60 into 2 equal to the longitudinal direction X, and each site | part spaced apart from the center Then, the rigidity of the napkin was measured by the following method. For Example 2, only the stiffness at the center position was measured. The results are shown in FIG. The abscissa of FIG. 12 shows the center position as 0 mm, the distance away from the front side Xf as a positive value, and the distance away from the back side Xr as a negative value.

[Rigidity measurement method]
The obtained sanitary napkin was stored in a test room at a temperature of 23 ° C. and a humidity of 50% for 24 hours, and then used as a measurement sample. Under the same conditions, the rigidity value was determined according to the handle ohmmeter method (JIS L-1096). Was measured. The handle ohmmeter uses model HOM-200 manufactured by Daiei Kagaku Seiki Seisakusho, with the measurement sample facing the non-skin side sheet 3 side downward and the longitudinal direction of the napkin perpendicular to the 15 mm wide slot. The penetrator blade was lowered at a constant speed of 200 mm / min, and the maximum value indicated by the indicator (load meter) was read.

From the results shown in FIG. 12, as in Examples 1 to 4, by forming an intermediate horizontal groove portion having a high occupation area ratio in the intermediate region, the intermediate region is compared with a case where such an intermediate horizontal groove portion is not provided. It can also be seen that the rigidity in the vicinity thereof decreases. Further, as in Examples 2 and 3, by forming an intermediate horizontal groove portion having a narrow width portion and a pair of low basis weight concave portions as the intermediate horizontal groove portion, the rigidity of the intermediate region and the vicinity thereof can be further reduced. I understand.
As described above, the sanitary napkin which is an example of the present invention has a lower rigidity in the intermediate region and the vicinity thereof than that of the comparative example 1, and therefore, according to the absorbent article of the present invention. For example, since the rigidity of the intermediate region is lower than the excretion region raised region and the rear raised region, it becomes easier to roll along the shape of the skin surface of the wearer in the intermediate region, and there is no gap between the skin of the wearer, It can be seen that leakage due to the gap can be surely prevented.

1 Sanitary napkin (absorbent article)
2 Skin side sheet 2a Top sheet 2b Solid guard forming sheet 3 Non-skin side sheet 4 Absorbent core 40 Excretion region raised area 41 Central thick part 44 Central lateral groove part 46 Central vertical groove part 45 Small absorbent part 42 Side thick part 47 Central lateral groove portion 48 Small absorbent portion 50 Rear raised region 51 Rear lateral groove portion 52 Small absorbent portion 60 Intermediate region 62, 62A Intermediate lateral groove portion (lateral groove portion)
62a Narrow width portion 62b Low basis weight concave portion 64 Vertical groove portion 65 Small absorption portion
6 Absorbent body 7 Wing part 8 Back flap part 10 Solid guard 11 Front middle high part (middle high part)
12 rear middle high part (middle high part)
13 Squeeze groove

Claims (8)

A skin-side sheet, a non-skin-side sheet, and an excretory part-facing portion that is disposed between these sheets and that has an absorbent core that is long in the front-rear direction of the absorbent article, and is disposed to face the liquid excretion part of the wearer. An absorbent article having a rear part arranged behind the excretory part facing part,
The absorbent core has an excretion part raised region in the excretion part facing part, and has a rear raised area in the center in the width direction of the rear part,
Each of the excretory region bulge region and the rear bulge region is thicker than the portion surrounding the periphery, and forms a mid-high portion projecting toward the skin side of the wearer on the skin-facing surface of the absorbent article,
The thickness of the absorbent core is smaller than the thickness of the excretory region bulge region and the rear bulge region between the excretion region bulge region and the rear bulge region over the entire width direction of the absorbent core. An intermediate region is formed,
In the excretion part raised region, a central lateral groove portion having a lower basis weight than the front and rear regions extending in the width direction of the absorbent core is formed.
The intermediate region is formed with an intermediate lateral groove portion having a lower basis weight than the front and rear regions extending in the width direction through the space between the excretory region raised region and the rear raised region. Is spaced from both the excretory region and the rear region,
Wherein a ratio of the area of the middle lateral groove to the area of the intermediate region, much larger than the ratio of the area of the central lateral groove portion to the area of the excretory part raised area,
Absorbent article whose ratio of the area of the above-mentioned middle transverse groove part to the area of the above-mentioned middle field is 0.01 or more and 0.70 or less .   The rear raised region has a low basis weight portion and a high basis weight portion, the rear basis groove portion extending in the width direction of the absorbent core is formed by the low basis weight portion, and the intermediate area with respect to the area of the intermediate region The absorbent article according to claim 1, wherein a ratio of the area of the lateral groove portion is larger than a ratio of the area of the rear lateral groove portion to the area of the rear raised region.   The absorbent article according to claim 1 or 2, wherein the intermediate lateral groove portion is formed so as to overlap an intermediate region center line that bisects the length of the intermediate region along the longitudinal direction of the absorbent core. .   The absorptive article according to any one of claims 1 to 3 in which said middle transverse groove part covers the whole area of the width direction of said absorptive core in said middle field.   The intermediate transverse groove is a narrow portion extending in the width direction of the absorbent core between the excretory portion raised region and the rear raised region, and an end portion in the width direction of the absorbent core rather than the narrow portion. In any one of Claims 1-3 which are located near and have a pair of low basic weight recessed parts in which the length in the longitudinal direction of this absorptive core is longer than the length of the same direction of this intermediate transverse groove part, respectively. The absorbent article as described.   The absorptive article according to claim 5 in which said low basic weight crevice has extended to the both ends edge of the longitudinal direction of said absorptive core.   The central transverse groove portion and the intermediate transverse groove portion, or the central transverse groove portion, the intermediate transverse groove portion, and the rear transverse groove portion are open on the upper surface side of the absorbent core. Absorbent article according to item.   The absorptive article according to any one of claims 1 to 7 in which said middle field is lower in rigidity than each of said excretory part rise field and said back uplift field.

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