JP2018023475A - Absorbent articles - Google Patents

Abstract

[Problem] To provide an absorbent article which hardly creates a gap between the absorbent article and the skin while being worn, further improves fit, prevents bodily fluids from flowing along the skin, and further improves leakage prevention. . An absorbent article (1) has an absorbent core (41). The absorbent core 41 is divided in the lateral direction Y into a central core region CT and side core regions ST, ST. It has a mid-high portion 43 that protrudes toward the skin from the facing surface ST1. The absorbent core 41 has a non-skin-side longitudinal groove portion 5 extending along the longitudinal direction X and arranged at a position overlapping the longitudinal center line CL on the non-skin-facing surface side of the central core region CT. The basis weight of the portion where the non-skin-side vertical groove portion 5 is arranged is formed by reducing the basis weight of the material forming the absorbent core 41 compared to the basis weight STw of each side core region ST. [Selection drawing] Fig. 2

Description

  The present invention relates to an absorbent article.

  The present applicant previously has a recess in the surface on the back sheet side in the central portion in the width direction of the absorber, and the recess is formed by reducing the basis weight of the constituent material of the absorber from other portions. A characteristic article was proposed (Patent Document 1). In addition, the present applicant has a protruding portion protruding from the skin facing surface side in the center region in the width direction of the absorbent core, and the vertical grooves are formed on the non-skin contact surface in the central region of the absorbent core. There has been proposed an absorbent article formed by reducing the basis weight of the absorbent core forming material as compared to the adjacent portions on both sides (Patent Document 2).

  According to the absorbent article described in Patent Document 1, when worn, the absorbent body easily deforms into a shape that protrudes in a curved shape toward the wearer's skin due to the concave portion of the absorbent body. improves. Further, according to the absorbent article described in Patent Document 2, when worn, the absorbent body having the protruding portion is easily deformed into a curved shape protruding toward the wearer's skin by the longitudinal groove of the absorbent body. Leakage resistance is improved while the fit is further improved.

JP 2006-115996 A JP 2014-104095 A

  The inventors of the present invention have a structure in which an absorbent body in a general absorbent article being worn is pushed in the width direction by both legs, and the central portion in the width direction of the absorbent body is easily deformed into a concave shape, and between the absorbent article and the skin. It has been found that a gap is formed, body fluid flows easily through the skin, and causes leakage. If the absorbent article described in Patent Document 1 is worn against such a leak, it protrudes in a curved shape toward the wearer's skin at the portion having the concave portion on the back sheet side of the absorbent body when worn. Since it is deformed to the shape, it is possible to prevent side leakage, but in the front-rear direction that does not have a recess, it is difficult to induce deformation, so a gap with the wearer's body is likely to occur before and after the excretion part, The absorbent article described in Patent Document 1 has room for improvement.

  Moreover, since the absorbent article described in Patent Document 2 has a plurality of longitudinal grooves along the longitudinal direction, it is excellent in flexibility in the width direction. However, Patent Document 2 discloses the center in the width direction of the absorbent core. It does not specifically describe the position of the longitudinal groove for causing the protruding portion of the region to protrude further toward the skin when worn.

  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 has a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular to the longitudinal direction, and has a long absorbent core in the longitudinal direction and is disposed opposite the wearer's liquid excretion part An absorbent article having a facing portion, wherein the absorbent core is divided into a central core region located in a lateral central portion and lateral core regions located laterally outward from the central core region, On the skin facing surface side of the excretory portion facing portion in the central core region, it has a middle and high portion that protrudes to the skin side from the skin facing surface of the side core region, and the non-skin facing surface of the central core region The central core region has a non-skin side longitudinal groove portion that is disposed at a position overlapping with a virtual bisector extending in the vertical direction passing through the horizontal center of the absorbent article and extending along the vertical direction, The non-skin-side flutes are absorbed by the non-skin-side flutes as compared to the laterally adjacent portions of the non-skin flutes The absorbent article by reducing the basis weight of the material forming the core is formed is to provide.

  According to the absorbent article of the present invention, during wearing, there is hardly any gap between the absorbent article and the skin, the fit is further improved, the body fluid is less likely to flow along the skin, and the leak-proof property is further improved. .

FIG. 1: is the top view which looked at the sanitary napkin which is preferable one Embodiment of the absorbent article for menstrual blood absorption of this invention from the skin opposing surface side. 2 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG. FIG. 3 is an enlarged cross-sectional view showing an absorbent core and a core wrap sheet that constitute the absorbent body of the sanitary napkin shown in FIG. 4 (a) and 4 (b) are schematic views showing a cross-section along the circumferential direction of a fiber stack drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 4B is a view showing a state before the absorbent core forming material is deposited in the accumulation recess, and FIG. 4B is a view showing a state in which the absorbent core formation material is deposited in the accumulation recess. FIG. 5 is a cross-sectional view schematically showing a state in which the sanitary napkin shown in FIG. 1 is worn. FIG. 6 is a cross-sectional view schematically showing an absorbent body provided in a sanitary napkin according to another embodiment of the absorbent article of the present invention (corresponding to FIG. 3). FIG. 7 is a cross-sectional view schematically showing an absorbent body included in a sanitary napkin of a comparative example (corresponding to FIG. 3).

  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 napkin 1 has a longitudinal direction X corresponding to the longitudinal direction of the wearer and a lateral direction Y orthogonal to the longitudinal direction X, and has a long absorbent core 41 in the longitudinal direction X, and excretion of fluid such as the vaginal opening of the wearer It has the excretion part opposing part B arrange | positioned facing a part. FIG. 1 shows a plan view of the napkin 1 viewed from the skin facing surface side, and FIG. 2 shows a cross-sectional view of the napkin 1. FIG. 3 shows a cross-sectional view of the absorbent body 4 included in the napkin 1.

  In this embodiment, as shown in FIGS. 1 and 2, the napkin 1 includes a liquid-permeable surface sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and both of these sheets 2. 3 has an absorbent main body 10 including an absorbent body 4 provided with an absorbent core 41. The absorbent body 4 has an absorbent core 41 containing pulp fibers, and a core wrap sheet 42 that covers the skin facing surface and the non-skin facing surface of the absorbent core 41.

As shown in FIG. 1, the absorbent main body 10 of the napkin 1 includes an excretion part facing part B having an excretion spot part P disposed opposite to a liquid excretion part such as a wearer's vaginal opening when worn, and the excretion part facing. A front part A arranged closer to the wearer's stomach side (front side) than the part B, and a rear part C arranged closer to the wearer's back side (rear side) than the excretory part facing part B The shape is long in the front-rear direction. The napkin 1 and the absorbent main body 10 have a longitudinal direction X corresponding to the wearer's front-rear direction, a lateral direction Y orthogonal to the longitudinal direction X, and a thickness direction Z. That is, the absorptive main body 10 is divided in the order of the front part A, the excretion part opposing part B, and the rear part C in the longitudinal direction X which is the front-back direction.
The excretion spot part P is a part that is disposed opposite to the liquid excretion part of the wearer when the absorbent article such as the napkin 1 is worn, and is directly supplied with menstrual blood. It is located at the center in the vertical direction X and the width direction Y of B. In the napkin 1 of the present embodiment, the excretion spot portion P has an elliptical shape having a long axis 4 cm along the center line extending in the vertical direction X that equally divides the napkin 1 in the width direction and a short axis 3 cm along the horizontal direction Y. It has become. Moreover, the excretion spot part P is the substantially same position as the protruding part 11 which protrudes to the wearer's skin side mentioned later.

  Moreover, in this specification, a skin opposing surface is a surface in the napkin 1 or its component (for example, surface sheet 2) orient | assigned to a wearer's skin side at the time of wear of the napkin 1, and a non-skin opposing surface is a napkin. 1 or a component thereof, which is a surface directed to the side opposite to the skin side (clothing side) when the napkin 1 is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction (direction orthogonal to the longitudinal direction) of the napkin 1 and the absorbent main body 10.

  In the present embodiment, as shown in FIGS. 1 and 2, the napkin 1 is further laterally extended from both side portions along the longitudinal direction X of the excretory part-facing portion B of the absorbent main body 10 in addition to the absorbent main body 10. A pair of rear wings 10W, 10W extending outwardly from Y and extending outwardly in the lateral direction Y from both sides along the longitudinal direction X of the rear part C of the absorbent main body 10. It has flap parts 10F and 10F.

  In the absorbent article of the present invention, the excretory part facing part B is a wing on a pair of left and right sides in the longitudinal direction X of the napkin 1 when it has a wing part 10W like the napkin 1 of the present embodiment. It is an area having the portion 10W, and more specifically means an area sandwiched between the root along the vertical direction X of one wing portion 10W and the root along the vertical direction X of the other wing portion 10W. 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.

  In the napkin 1 of this embodiment, the surface sheet 2 has coat | covered the whole region of the skin opposing surface of the absorber 4, as shown in FIG.1 and FIG.2. On the other hand, the back sheet 3 covers the whole 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 longitudinal direction X of the top sheet 2. A side flap portion 10 </ b> S is formed together with the forming sheet 7. The leak-proof cuff forming sheet 7 and the back sheet 3 fixed to the skin-facing surface of the top sheet 2 are adhesives, heat seals, ultrasonic waves at the extended portions from both ends in the longitudinal direction X of the absorber 4. They are joined together by a known joining means such as a seal. In addition, between each of the top sheet 2 and the back sheet 3 and the absorbent body 4 may be joined by an adhesive.

  In the napkin 1, the leak-proof cuff forming sheet 7 includes both side portions along the longitudinal direction X on the skin facing surface of the surface sheet 2 disposed on the skin facing surface of the absorbent main body 10 as shown in FIGS. 1 and 2. It is arranged and fixed. Preferably, the leak-proof cuff forming sheet 7 is arranged and fixed over the entire length in the longitudinal direction X of the absorbent main body 10 so as to overlap both left and right side portions along the longitudinal direction X of the absorbent body 4 in plan view. ing. The leak-proof cuff forming sheet 7 may be provided with a leak-proof cuff-forming elastic member inside a folded portion formed by folding back the free end side, for example. When the leak-proof cuff forming elastic member is arranged in this way, a leak-proof cuff is formed in which the folded portion rises toward the wearer's skin due to the contraction force of the leak-proof cuff forming elastic member. . When the leak-proof cuff is formed in this way, it is possible to prevent side leakage of menstrual blood excreted on the skin facing surface.

  In the napkin 1, as shown in FIG. 1, the side flap part 10S protrudes greatly outward in the lateral direction Y at the excretory part facing part B, and thereby the left and right along the longitudinal direction X of the absorbent main body 10 A pair of wing portions 10W and 10W are extended on both sides. Further, as shown in FIG. 1, the side flap portion 10 </ b> S projects greatly outward in the lateral direction Y at the rear portion C, and thereby a pair of side flap portions 10 </ b> S is provided on both the left and right sides along the longitudinal direction X of the absorbent main body 10. The rear flap portions 10F, 10F are extended.

  The wing portion 10W is used by being folded back to the non-skin facing surface side of the crotch portion of clothes such as shorts. In the napkin 1, the wing portion 10 </ b> W has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is located on a side portion along the longitudinal direction X of the absorbent main body 10 in a plan view as illustrated in FIG. 1. It has a shape. A wing portion adhesive portion (not shown) for fixing the wing portion 10W (napkin 1) to clothes (not shown) such as shorts is formed on the non-skin facing surface of the wing portion 10W. The wing portion 10W folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothes can be adhesively fixed to the crotch portion by the adhesive portion during use. Moreover, the main body adhesion part (not shown) for fixing the absorptive main body 10 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 10.

  The rear flap portion 10F is arranged on the skin facing surface side of clothing such as shorts when worn. A rear flap portion adhesive portion (not shown) for fixing the rear flap portion 10F to clothing (not shown) such as shorts is formed on the non-skin facing surface of the rear flap portion 10F. The rear flap portion 10F can be adhesively fixed on the skin-facing surface (inner surface) of the clothing by the adhesive portion during use.

  The absorptive core 41 is formed from the fiber assembly which consists of fiber materials containing a pulp fiber. The absorbent core 41 is covered with a core wrap sheet 42. In the napkin 1, both the skin facing surface and the non-skin facing surface are covered with the core wrap sheet 42. In the napkin 1, as shown in FIG. 2, the entire absorbent core 41 is covered with a single core wrap sheet 42. One core wrap sheet 42 has the same length as the length of the absorbent core 41 in the longitudinal direction X, and has a length that is at least twice the length of the absorbent core 41 in the lateral direction Y. . And the center part of the horizontal direction Y of one core wrap sheet | seat 42 is piled up on the skin opposing surface of the absorbent core 41, and the both ends of the horizontal direction Y of one core wrap sheet | seat 42 of the absorbent core 41 are piled up. Fold it back to the non-skin-facing surface and overlap the folded edges. In this way, both the skin facing surface and the non-skin facing surface of the absorbent core 41 are covered with one core wrap sheet 42. The core wrap sheet 42 is used for the purpose of preventing leakage of the forming material of the absorbent core 41 and improving the shape retention of the absorbent core 41. Between the top sheet 2 and the core wrap sheet 42 covering the skin facing surface side of the absorbent core 41, and between the back sheet 3 and the core wrap sheet 42 covering the non-skin facing surface side of the absorbent core 41. Are preferably joined to each other by a pattern-coated adhesive such as dots, spirals, stripes or the like.

  The absorbent core 41 may contain a water-absorbing polymer. As the superabsorbent polymer that the absorbent core 41 has, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. As the superabsorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal acrylate can be used. Examples thereof include polyacrylic acid and salts thereof and polymethacrylic acid and salts thereof. As the polyacrylate and polymethacrylate, sodium salts can be preferably used. In addition, acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, styrenesulfonic acid, etc. It is also possible to use a copolymer obtained by copolymerizing the above-mentioned comonomer within a range that does not deteriorate the performance of the superabsorbent polymer.

  As shown in FIGS. 1 to 3, the absorbent core 41 includes a central core region CT located at the center in the lateral direction Y and lateral core regions ST located laterally both outward from the central core region CT. It is divided into ST. Here, in the napkin 1, the central core region CT is a central region when the absorbent core 41 is divided into approximately three equal parts in the lateral direction Y, and the bilateral core regions ST and ST are the absorbent cores. This means a side area excluding the central area when 41 is divided into approximately three equal parts in the horizontal direction Y. As shown in FIG. 1, the central core region CT and each side core region ST extend over the entire length in the longitudinal direction X of the absorbent core 41.

  As shown in FIGS. 1 to 3, the absorbent core 41 is closer to the skin facing surface side of the excretory portion facing portion B in the central core region CT than the skin facing surface ST <b> 1 of the side core region ST (see FIG. 3). It has the middle-high part 43 which protrudes to the skin side. When the absorbent core 41 has the middle-high portion 43 on the skin facing surface side, the absorbent main body 10 of the napkin 1 is formed with a raised portion 11 that protrudes toward the wearer's skin corresponding to the middle-high portion 43. Will come to be. Here, the skin facing surface ST1 of the lateral core region ST is not only formed in a stepless manner parallel to the surface direction composed of the vertical direction X and the horizontal direction Y as shown in FIG. The skin facing surface ST1 in the case where the skin facing surface ST1 of the lateral core region ST is formed in a plurality of stages is the surface on the most non-skin facing surface side in the absorbent core 41. Means that.

  As shown in FIG. 3, the mid-high portion 43 of the absorbent core 41 protrudes from the skin facing surface ST1 of the side core region ST with a height t43 on the skin side. Here, the height t43 is the thickness of the thickest portion in the thickness of the middle-high portion 43. The ratio of the height t43 to the total thickness t1 in the central core region CT including the middle-high portion 43 ((t43 / t1) × 100) is preferably 20% or more, more preferably 30% or more, and preferably 90 % Or less, more preferably 80% or less, specifically 20% or more and 90% or less, more preferably 30% or more and 80% or less. The height t43 of the middle-high portion 43 is the same as the value obtained by subtracting the thickness t2 of the side core region ST from the total thickness t1 in the central core region CT. The total thickness t1 of the central core region CT and the thickness t2 of the side core region ST are measured as follows.

[Measurement method of total thickness t1 of central core region CT and thickness t2 of side core region ST]
From the absorbent core 41, a portion of the central core region CT including the middle and high portions 43 and a portion of the side core region ST having the skin facing surface ST1 are cut out. Place the acrylic plate at the center of each cut out part so that the center of the acrylic plate with a size of 20 mm x 20 mm and thickness of 3 mm coincides, and non-contact type laser displacement meter (laser head LK-G30, displacement meter LK manufactured by KEYENCE) -GD500) is used to measure the thickness of each part. The pressure during thickness measurement is 0.5 g / cm ² .

  The ratio of the width W43 (see FIG. 1) of the middle-high portion 43 to the total width W41 of the absorbent core 41 ((W43 / W41) × 100) of the middle-high portion 43 of the absorbent core 41 is preferably 20% or more, more preferably Is 30% or more, preferably 80% or less, more preferably 70% or less. Specifically, it is preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less. is there. Here, the width W43 of the middle-high portion 43 means a length at a portion where the length in the lateral direction Y is longest when the middle-high portion 43 is viewed in plan. Further, the full width W41 of the absorbent core 41 means the length of the absorbent core 41 at the site where the length in the lateral direction Y of the excretory part-facing portion B of the absorbent core 41 is the longest. .

  In the napkin 1, as shown in FIG. 1, the absorbent core 41 has a shape that is long in the longitudinal direction X extending from the front part A to the rear part C, and the middle-high part 43 is the longitudinal direction of the absorbent core 41. X has a long shape. The middle-high portion 43 that is long in the vertical direction X extends from the excretory part facing part B of the napkin 1 to a part of the front part A, and is formed from the excretion part facing part B to a part of the rear part C. When the absorbent core 41 is viewed in plan, the ratio ((L43 / L41) × 100) of the length L43 (see FIG. 1) in the longitudinal direction X of the middle-high portion 43 to the overall length L41 in the longitudinal direction X of the absorbent core 41 is , Preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably 70% or less, specifically preferably 20% or more and 80% or less, more Preferably they are 30% or more and 70% or less. Here, the length L43 of the middle-high portion 43 means a length at a portion where the length in the longitudinal direction X is the longest when the middle-high portion 43 is viewed in plan. Moreover, the full length L41 of the absorptive core 41 means the length in the site | part where the length of the longitudinal direction X of the absorptive core 41 is the longest when the absorptive core 41 is planarly viewed.

  In the napkin 1, as shown in FIGS. 1 and 2, an imaginary bisector extending in the longitudinal direction X passing through the center in the lateral direction Y of the napkin 1 on the non-skin facing surface side of the central core region CT in the absorbent core 41. The non-skin-side vertical groove 5 is disposed at a position overlapping the vertical center line CL and extends along the vertical direction X. The non-skin-side vertical groove portion 5 may be formed in a continuous line shape as long as it extends along the vertical direction X at a position overlapping the vertical center line CL, and is formed in a discontinuous line shape that is intermittently arranged. May be. The non-skin side longitudinal groove 5 may penetrate through the absorbent core 41 as long as it is formed from the non-skin facing surface of the absorbent core 41 toward the skin facing surface side. The core 41 is formed so as to be convexly recessed from the non-skin facing surface to the skin facing surface side. The non-skin side longitudinal groove 5 is viewed from the non-skin facing surface side of the absorbent core 41, and the non-skin side longitudinal groove 5 has a bottomed shape on the skin facing surface side of the absorbent core 41. Moreover, the non-skin side vertical groove part 5 is that the length of the absorbent core 41 in the vertical direction X is at least longer than the length of the excretion spot part P in the vertical direction X. From the viewpoint of making it difficult for gaps to be formed between the skin and the entire X region, and improving fit. As a more preferable form, such a non-skin side longitudinal groove portion 5 has a total length in the longitudinal direction X of the absorbent core 41 at a position overlapping the longitudinal center line CL in the napkin 1 as seen in a plan view as shown in FIG. It is distributed over. Thereby, also in the front-back part of the vertical direction X of the excretion spot part P, adhesiveness with skin improves, a bodily fluid does not flow easily along skin, and leak-proof property further improves.

In the napkin 1, the non-skin side longitudinal groove portion 5 is arranged on the non-skin side of the central core region CT of the absorbent core 41. The basis weight of the portion where the non-skin side longitudinal groove portion 5 is arranged is formed by reducing the basis weight of the forming material of the absorbent core 41 as compared with the laterally adjacent portion of the non-skin side longitudinal groove portion. The laterally adjacent portion is a peripheral portion excluding the non-skin side longitudinal groove portion 5, and the basis weight of the portion where the non-skin side longitudinal groove portion 5 is arranged is the basis weight STw of each side core region ST of the absorbent core 41. More preferably, the basis weight is reduced. The ratio of the basis weight 5w ((5w / STw) × 100) of the portion where the non-skin side longitudinal groove 5 is disposed to the basis weight STw of the side core region ST is preferably 5% or more, more preferably 10% or more. Moreover, it is preferably 95% or less, more preferably 90% or less, specifically, preferably 5% or more and 95% or less, more preferably 10% or more and 90% or less. The basis weight STw of the lateral core region ST is preferably 50 g / m ² or more, more preferably 100 g / m ² or more, and preferably 600 g / m ² or less, more preferably 500 g / m ² or less. Specifically, it is preferably 50 g / m ² or more and 600 g / m ² or less, more preferably 100 g / m ² or more and 500 g / m ² or less. Further, the basis weight 5w of the portion where the non-skin side longitudinal groove 5 in the central core region CT is preferably 20 g / m ² or more, more preferably 50 g / m ² or more, and preferably 400 g / m. ² or less, more preferably 300 g / m ² or less, specifically preferably 20 g / m ² or more and 400 g / m ² or less, more preferably 50 g / m ² or more and 300 g / m ² or less. Further, the basis weight of the central core region CT having the middle and high portions 43, that is, the basis weight of the portion excluding the portion where the non-skin side longitudinal groove portion 5 is arranged in the central core region CT is the basis weight STw of the side core region ST. Greater than, preferably 150 g / m ² or more, more preferably 200 g / m ² or more, preferably 1000 g / m ² or less, more preferably 900 g / m ² or less. Is from 150 g / m ^{2 to} 1000 g / m ² , more preferably from 200 g / m ^{2 to} 900 g / m ² .

  Here, the basis weight of the basis weight STw of the side core region ST is divided into three absorbent cores 41 by cutting the absorbent core 41 so as to pass both side edges along the longitudinal direction X of the middle and high portions 43, An average of two values obtained by dividing the mass of each of the remaining two cut samples other than the cut sample including the middle-high portion 43 by the area of, for example, the skin facing surface side of each cut sample is obtained. Further, the basis weight 5w of the portion where the non-skin side vertical groove portion 5 in the central core region CT of the absorbent core 41 is specifically passed so as to pass through the position of the maximum groove width of the non-skin side vertical groove portion 5. 1, a portion of the absorbent core 41 where the non-skin side vertical groove portion 5 is disposed is cut out so as to pass through the position of the maximum groove width of the non-skin side vertical groove portion 5 on the non-skin facing surface of the absorbent core 41. The mass of the sample obtained is divided by the area of the cut-out sample, for example, the surface facing the skin. Moreover, the basic weight of the part except the part by which the non-skin side vertical groove part 5 was distribute | arranged in central core area | region CT is the basis weight of the part by which the non-skin side vertical groove part 5 was distribute | arranged from central core area CT of the absorbent core 41. The mass of the sample excluding the sample cut out in order to measure the quantity 5w is obtained by dividing the sample by, for example, the area of the surface facing the skin. In addition, the mass of each sample is measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point).

  In the napkin 1, it is preferable that the non-skin side longitudinal groove portion 5 of the absorbent core 41 is formed to have a depth larger than the thickness of the side core region ST, as shown in FIG. The wearer in the excretion spot part P is that the non-skin side longitudinal groove part 41 of 41 has a depth larger than the thickness of the side core region ST and the top part 5t reaches the inside of the middle-high part 43. It is preferable in the adhesiveness with the liquid excretion part. More preferably, in the napkin 1, the non-skin side longitudinal groove 5 extends beyond the position of the skin facing surface ST1 of the side core region ST from the non-skin facing surface of the absorbent core 41 toward the skin facing surface. The adhesiveness with the wearer's liquid excretion part is further increased by being formed to be convexly depressed. As shown in FIG. 3, the ratio ((d / t1) × 100) of the depth d of the non-skin side longitudinal groove 5 to the total thickness t1 in the central core region CT including the middle and high portions 43 is preferably 5% or more. More preferably, it is 10% or more, preferably 90% or less, more preferably 80% or less, specifically, preferably 5% or more and 90% or less, more preferably 10% or more and 80% or less. It is as follows. The depth d of the non-skin side longitudinal groove 5 is preferably 2.0 mm or more, more preferably 3.0 mm or more, and preferably 20.0 mm or less, and 15.0 mm or less. More preferably, it is preferably 2.0 mm or more and 20.0 mm or less, and more preferably 3.0 mm or more and 15.0 mm or less.

  Further, in the napkin 1, the non-skin-side longitudinal groove portion 5 of the absorbent core 41 relates to the length in the lateral direction Y when viewed in cross section as shown in FIG. The length W5d on the facing surface side is formed longer than the length W5u on the skin facing surface side of the central core region CT. When the length W5d of the non-skin-side vertical groove portion 5 on the non-skin facing surface side is longer than the length W5u of the non-skin-side vertical groove portion 5 on the skin-facing surface side, the lateral direction of the non-skin-side vertical groove portion 5 The length (width) of Y may be increased stepwise from the top 5t side of the non-skin side vertical groove 5 in the absorbent core 41 toward the non-skin facing surface side of the non-skin side vertical groove 5. The napkin 1 may be gradually longer, although the length may be gradually increased.

  In the napkin 1, the ratio ((W5d / W41) × 100) of the length W5d (see FIG. 3) on the non-skin facing surface side of the non-skin-side vertical groove 5 to the full width W41 (see FIG. 2) of the absorbent core 41 is obtained. 1% or more, more preferably 2% or more, preferably 30% or less, more preferably 20% or less, and specifically preferably 1% or more and 30% or less, more Preferably they are 2% or more and 20% or less. The length W5d on the non-skin facing surface side of the non-skin side longitudinal groove 5 is preferably 0.5 mm or more, and more preferably 1.0 mm or more. If the length W5d on the non-skin facing surface side is smaller than the above range, the absorbent core 41 can be bent with a small curvature, and it becomes difficult to form a convex portion toward the skin facing surface side, so that it is flexible and good. It is difficult to obtain a good fit. And it is preferable that it is 20 mm or less, and it is still more preferable that it is 15 mm or less. If the length W5d on the non-skin facing surface side is larger than the above range, the absorbent core 41 is liable to be deformed distorted, and it becomes difficult to obtain a good fit and a leakage preventing effect. Specifically, it is preferably 0.5 mm or more and 20 mm or less, and more preferably 1.0 mm or more and 15 mm or less.

  In the napkin 1, the absorbent core 41 has a pair of skin-side longitudinal groove portions 62 extending in the longitudinal direction X at a position sandwiching the middle-high portion 43 in the width direction on the skin facing surface side, as shown in FIGS. 62. Preferably, in the napkin 1, the topsheet 2 and the absorber 4 are integrated toward the backsheet 3 side at a position where the excretion spot P is sandwiched between the skin facing surface of the absorbent main body 10 (skin facing surface of the topsheet 2). A linear squeezing groove 6 is provided. “Linear” in the linear compressed groove 6 means that the shape of the groove (concave portion) is not limited to a straight line in a plan view but includes a curved line. Each line may be a continuous line or a discontinuous line such as a broken line. For example, the squeezing groove 6 may be composed of a row formed by a number of discontinuous point embosses. The pressing groove 6 can be formed by applying pressure or embossing with heating and pressing from the skin facing surface side of the absorbent main body 10. Moreover, the pressing groove 6 may be in a state where its constituent fibers are heat-sealed. The density of the compressed groove 6 is higher than the density of other parts excluding the compressed groove 6. Therefore, the compressed groove 6 is a groove different from the non-skin side longitudinal groove portion 5 formed in the absorbent core 41.

  In the napkin 1, as shown in FIG. 1, the pressing grooves 6 are formed in the front portion A and the rear portion C, respectively, in the horizontal pressing groove 61 extending in the horizontal direction Y, and on both side portions along the vertical direction X. It has a vertical squeezing groove extending in the vertical direction X from the front part A to the rear part C. In the napkin 1, the vertical pressing groove is a skin side vertical groove portion 62. In the napkin 1, the skin-side longitudinal groove portion 62, which is a longitudinal squeezing groove, is arranged in a pair of forms in a bilaterally symmetrical manner with respect to the longitudinal center line CL. In the napkin 1, the pair of skin-side longitudinal groove portions 62 are arranged on the skin facing surfaces ST <b> 1 of the both side core regions ST and ST and are formed at positions sandwiching the middle-high portion 43. For example, it may be formed on both sides of the middle-high portion 43 along the longitudinal direction X of the middle-high portion 43, and both sides of the central core region CT along the longitudinal direction X of the central core region CT. It may be formed on the top. Each skin-side longitudinal groove 62 extends in the longitudinal direction X from the front part A to the rear part C, and forms a convex curved shape outward in the lateral direction Y in the excretory part facing part B. X extends. Moreover, in the napkin 1, the horizontal pressing groove 61 of the front part A and the rear part C is extended in the horizontal direction Y, forming the convex curve shape toward the vertical direction X outward. In the napkin 1, the lateral pressing groove 61 of the front part A, one skin side longitudinal groove part 62, the lateral pressing groove 61 of the rear part C, and the other skin side longitudinal groove part 62 are connected to form a ring-shaped circumferential groove. ing. The compressed groove 6 formed in this way can effectively prevent liquid leakage from the periphery of the napkin 1 by suppressing the diffusion of the body fluid flowing in the plane direction on the top sheet 2.

  The overall length L5 in the longitudinal direction X of the non-skin side longitudinal groove portion 5 is preferably formed longer than the overall length L6 in the longitudinal direction X of the skin side longitudinal groove portion 62. In the napkin 1, as shown in FIG. Then, the non-skin-side vertical groove portion 5 is arranged to extend over the entire length of the absorbent core 41 in the vertical direction X, and the total length L5 of the non-skin-side vertical groove portion 5 in the vertical direction X is the skin-side vertical groove portion 62. It is formed longer than the total length L6 in the vertical direction X.

  As for the absorptive core 41, central core area | region CT which has the middle-high part 43, and each side core area | region ST are integrally formed. Here, “molded in one piece” means that the same material is used in one step, unlike the case where members manufactured in different steps are joined by a bonding means such as an adhesive or compression. It means that they are integrally formed. Accordingly, there are no adjacent portions or connecting portions between the cores that are produced when two separately manufactured absorbent cores are arranged side by side at the boundary between the central core region CT and the side core regions ST and ST. Moreover, in the napkin 1, since the whole absorptive core 41 is integrally molded, between the part which forms the middle-high part 43 distribute | arranged to center core area | region CT, and the part nearer to a non-skin opposing surface side than it Similarly, there are no adjacent portions or connecting portions between layers. Even when the raised portion 11 corresponding to the middle-high portion 43 starts from the non-skin-side longitudinal groove portion 5 and the raised portion 11 deforms into a convex shape along the body shape, a part of the absorbent core 41 is broken, Even in the front-rear direction of the excretion spot part P and the liquid excretion part of the wearer without being peeled off, it can be deformed so as to fit the wearer as a whole, and a gap is hardly generated between the wearer's skin. Become. Furthermore, even when the liquid absorbed from the middle and high portions 43 is smoothly diffused in the thickness direction of the absorbent core 41 and a large amount of liquid is supplied, the liquid hardly remains on the skin contact surface, and an excellent dry feeling. A comfortable wearing feeling can be obtained. A method for manufacturing the absorbent core having such a structure will be described later.

As shown in FIG. 4A, the absorbent core 41 of the napkin 1 described above includes a stacking drum 141 provided on the outer peripheral surface and rotating in one direction R, and the outer periphery of the stacking drum 140. 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 141 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 140. The bottom surface 142 of the accumulation recess 141 is made of a mesh plate or the like and has a large number of pores that function as suction holes.

  Further, as shown in FIG. 4A, a recess 143 for forming the middle-high portion 43 is formed on a part of the bottom surface 142 of the accumulation recess 141. Moreover, the groove part formation member 145 for forming the non-skin side vertical groove part 5 in the absorptive core 41 is arrange | positioned so that attachment or detachment is possible. The groove portion forming member 145 is detachably disposed on the upper portion of the accumulation concave portion 141 at a position corresponding to the non-skin side vertical groove portion 5, and is made of, for example, metal, plastic, ceramic, or the like.

  For example, a groove forming member 145 that can be attached to and detached from a known fiber stacking device including a fiber stacking drum is disposed, and core material such as pulp fiber is supplied into the duct while sucking from the bottom surface of the stacking recess 141. As a result, as shown in FIG. 4B, the core material is deposited in a predetermined shape in the recesses 141 for accumulation. The absorbent core 41 is obtained by removing the removable groove forming member 145 and releasing the deposit 400 from the accumulation recess 141. The absorbent core 41 is pressed and appropriately compressed by passing between a pair of rolls before or after coating with the core wrap sheet 42. Thereby, it becomes the non-skin side vertical groove part 5 with comparatively small basic weight and density, and the part deposited on the bottom face of each recessed part 143 becomes a part which has the middle-high part 43 with comparatively large basic weight and density. Similarly, in the portion other than the concave portion 143, the portion deposited on the bottom surface is a peripheral region having a relatively smaller basis weight and density than the portion having the middle-high portion 43. When using a superabsorbent polymer for the core material of the absorptive core 41, the introduction part of the absorptive polymer is provided in the middle of the duct and contained in the fiber assembly.

The formation material of each structural member of the napkin 1 of this embodiment mentioned above is demonstrated.
As the top sheet 2 and the back sheet 3, various kinds of materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a single layer or multilayer nonwoven fabric, an apertured film, or the like can be used. Moreover, as the back surface sheet 3, a moisture-permeable resin film etc. can be used. Moreover, as the sheet for forming a leak-proof cuff, a water-repellent nonwoven fabric having high water pressure resistance, such as a spunbond nonwoven fabric, a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used.

In the napkin 1, it is preferable that an adhesive is applied and fixed between the top sheet 2 and the absorber 4 and between the absorber 4 and the back sheet 3. The adhesive can be applied using a known means such as a slot coat gun, a spiral spray gun, a spray gun, or a dot gun. In the napkin 1, the adhesive can be applied in a spiral shape using a spiral spray gun. preferable. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The application amount of the hot melt adhesive is preferably 1.5 g / m ² or more and 10 g / m ² or less.

The operational effect and estimation mechanism of the napkin 1 described above will be described.
If the wearer of the napkin 1 takes a posture in which the width of the wearer's crotch becomes narrower, such as taking a posture in which the body is turned sideways and the legs are crossed at bedtime, the absorbent body 4 of the napkin 1 is placed on both sides of the wearer. It is pushed in the direction Y. Here, the napkin 1 has a middle-high portion 43 that protrudes toward the skin facing surface side in the central core region CT of the absorbent core 41, and on the non-skin facing surface side of the central core region CT, It has the non-skin side vertical groove part 5 with the comparatively small basis weight of a forming material compared with the horizontal direction adjacent part extended in the vertical direction X in the overlapping position. In the napkin 1, it is preferable that the non-skin-side vertical groove 5 is formed such that the length of the absorbent core 41 in the vertical direction X is longer than the length of the middle-high portion 43 in the vertical direction X. The length of the portion P is longer than the length of the vertical direction X. Therefore, as shown in FIG. 5, in the entire area of the excretion spot portion P, the raised portion 11 corresponding to the middle-high portion 43 starts from the non-skin side longitudinal groove portion 5. It is easy to protrude, and not only the excretion spot part P but also the front and back thereof are less likely to cause a gap between the napkin 1 and the wearer's skin, the fit is further improved, and body fluid does not easily flow through the skin. Leakage is improved.

  Further, as shown in FIG. 3, the non-skin side longitudinal groove portion 5 of the napkin 1 is formed so that the length W5d on the non-skin facing surface side is longer than the length W5u on the skin facing surface side as shown in FIG. The raised portions 11 corresponding to the middle and high portions 43 are more likely to protrude from the non-skin side longitudinal groove portion 5 as the starting point, further improving the fit and further improving the leakproof property.

  Moreover, in the napkin 1, as shown in FIG. 3, the non-skin side vertical groove part 5 of the absorptive core 41 is formed so that the depth is larger than the thickness of the side core area ST. It is preferable from the point of the improvement of adhesiveness with the liquid excretion part of the wearer in the part P. Further, in the napkin 1, the non-skin-side vertical groove portion 5 extends from the non-skin-facing surface of the absorbent core 41 toward the skin-facing surface side, and the top portion 5t exceeds the position of the skin-facing surface ST1 of the side core region ST. Thus, it is preferable that the inside reaches the inside of the middle-high portion 43, and the depth d thereof is larger than the thickness of the side core region ST. Therefore, as shown in FIG. 5, the raised portion 11 corresponding to the middle-high portion 43 starting from the non-skin side longitudinal groove portion 5 is more likely to protrude toward the liquid excretion portion, and is in close contact with the liquid excretion portion in the excretion spot portion P. In terms of performance, the fit is further improved and the leak-proof property is further improved.

  Further, in the napkin 1, only one non-skin side longitudinal groove portion 5 formed in this way is arranged over the entire length in the longitudinal direction X of the absorbent core 41 in plan view as shown in FIG. Since the non-skin side longitudinal groove 5 is a starting point, the raised portions 11 corresponding to the middle and high portions 43 protrude from the excretion spot portion P and the front and rear sides of the liquid discharge portion of the wearer of the excretion spot portion P, Adhesion is improved, body fluid is less likely to flow along the skin, and leakage resistance is further improved.

  Moreover, in the napkin 1, as shown in FIG.1 and FIG.2, the absorptive core 41 has a pair of skin side vertical groove parts 62 and 62 extended in the vertical direction X in the position which pinches | interposes the middle-high part 43 in the skin opposing surface side. Have. Therefore, when the absorbent body 4 is pushed in the lateral direction Y with both legs while the napkin 1 is being worn, the lateral direction is more lateral than the skin-side longitudinal groove portions 62, 62 starting from the pair of skin-side longitudinal groove portions 62, 62. The Y outer portion is pushed inward in the lateral direction Y, and the raised portion 11 corresponding to the middle-high portion 43 starting from the non-skin side longitudinal groove portion 5 is more likely to protrude toward the wearer's skin side, and further through the skin side groove. Then, both side portions of the napkin are bent toward the wearer's skin side, and the napkin 1 is viewed in cross section as shown in FIG. 5, and the center portion is easily deformed so as to draw a W-shape. When the napkin 1 is deformed so as to draw a W-shape in this way, a gap is not easily formed between the napkin 1 and the wearer's skin, the fit is further improved, and body fluid does not easily flow through the skin, thus preventing leakage. The property is further improved.

  Further, in the napkin 1, the non-skin-side flutes 5 are arranged to extend over the entire length in the longitudinal direction X of the absorbent core 41 in a plan view as shown in FIG. The total length L5 in the vertical direction X is longer than the total length L6 in the vertical direction X of the skin side vertical groove 62. Therefore, when the absorbent body 4 is pushed in the lateral direction Y with both legs while the napkin 1 is worn, the napkin 1 is more easily deformed so as to draw a W shape, the fitting property is further improved, and the leak-proof property Is further improved.

  In the absorbent core 41, the central core region CT that forms the middle-high portion 43 and the side core regions ST and ST are integrally formed. As a result, when the absorbent body 4 is pushed in the lateral direction Y by the wearer's legs while the napkin 1 is being worn, the napkin 1 rises in a convex shape on the skin side of the wearer and flexes the skin side groove. As a shaft, both sides of the napkin 1 are bent toward the wearer's skin-facing surface and are substantially deformed so as to draw a substantially W shape as a whole, the fit is further improved, and leakage such as side leakage is improved. Further improvement.

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 the said embodiment at all, and can be changed suitably.
For example, in the napkin 1, as shown in FIG. 3, the non-skin-side vertical groove portion 5 of the absorbent core 41 is viewed in cross section, and the non-skin-facing surface side length W5d of the non-skin-side vertical groove portion 5 is non-skin. It is longer than the length W5u on the skin facing surface side of the side longitudinal groove portion 5, and gradually becomes longer from the top 5t side of the non-skin side longitudinal groove portion 5 toward the non-skin facing surface side of the non-skin side longitudinal groove portion 5. For example, as shown in FIG. 6, the length W5d on the non-skin facing surface side of the non-skin-side vertical groove portion 5 and the length W5u on the skin-facing surface side of the non-skin-side vertical groove portion 5 are the same length. You may form with the same groove width toward the non-skin opposing surface side of the non-skin side vertical groove part 5 from the top 5t side of the side vertical groove part 5. FIG. Regarding the absorbent body 4 shown in FIG. 6, constituent parts different from those of the napkin 1 described above will be mainly described, and the same constituent parts will be denoted by the same reference numerals and description thereof will be omitted. The description of the absorbent body 4 shown in FIG.

  Moreover, in the napkin 1, as shown in FIG. 3, the non-skin side vertical groove part 5 of the absorptive core 41 is a side core area | region ST from the non-skin facing surface side of the absorptive core 41 toward the skin facing surface side. The top 5t of the skin facing surface ST1 is formed so as to be convexly depressed until reaching the inside of the middle / high portion 43, but the top 5t may not reach the inside of the middle / high portion 43. It is sufficient that the absorbent core 41 is formed so as to protrude from the non-skin facing surface toward the skin facing surface.

  The absorbent article of the present invention may be a sanitary napkin, a panty liner (clay sheet), or the like.

  Hereinafter, the absorptive article of the present invention is explained still in detail by an example. However, the scope of the present invention is not limited by the examples.

<Example 1>
A sanitary napkin having the same basic structure as that of the sanitary napkin 1 shown in FIGS. 1 and 2 having the absorbent core 41 and the absorbent core 4 provided with the core wrap sheet 42 shown in FIG. Samples of As the surface sheet, a spunbonded nonwoven fabric having a basis weight of 25 g / m ² was used. As the back sheet, a moisture-permeable resin film having a basis weight of 35 g / m ² was used. A spunbonded nonwoven fabric having a basis weight of 25 g / m ² was used as the leak-proof cuff forming sheet. As the absorbent body, the absorbent core was formed as a mixed fiber body of pulp fibers and water-absorbing polymer. The average basis weight of the absorbent core is 300 g / m ² , and the content of the superabsorbent polymer (SAP) in the absorbent core is 6.5% by mass. Aquaric CA was used. Moreover, as shown in FIG.1 and FIG.2, in the sample of Example 1, the linear pressing groove 6 was formed in the skin opposing surface. The non-skin-side flutes of the absorbent core extend from the non-skin-facing surface of the absorbent core toward the skin-facing surface, beyond the position of the skin-facing surface ST1 of the side core region ST, and the top 5t is a middle-high portion. It was formed so as to be concaved up to the inside. The non-skin-side longitudinal groove portion is formed such that the length W5d on the non-skin facing surface side is longer than the length W5u on the skin-facing surface side and gradually increases from the top 5t side toward the non-skin facing surface side. .

Details of the absorbent core in the sample of Example 1 are as follows.
The total thickness t1 in the central core region CT of the absorbent core is 7.5 mm, the thickness t2 of the side core region ST is 4.3 mm, and the height of the middle-high portion with respect to the total thickness t1 in the central core region CT including the middle-high portion. The ratio of t43 ((t43 / t1) × 100) was 43%.
The total width W41 of the absorbent core was 80 mm, the width W43 of the mid-high portion was 30 mm, and the ratio of the width W43 of the mid-high portion to the full width W41 ((W43 / W41) × 100) was 38%.
The overall length L41 in the longitudinal direction X of the absorbent core is 324 mm, the length L43 (see FIG. 1) is 130 mm, and the ratio of the length L43 (see FIG. 1) in the longitudinal direction X of the middle-high portion to the overall length L41 in the longitudinal direction X (see FIG. 1). (L43 / L41) × 100) was 40%.
The basis weight 5w of the portion where the non-skin side longitudinal groove 5 is arranged is 200 g / m ² , the basis weight STw of the side core region ST is 230 g / m ² , and the basis weight STw of the side core region ST is the non-skin side The ratio of the basis weight 5w ((5w / STw) × 100) of the portion where the longitudinal groove portion 5 is arranged was 87%.
The ratio ((d / t1) × 100) of the depth d of the non-skin side longitudinal groove portion to the total thickness t1 in the central core region CT including the middle and high portions was 67%. The depth was 5 mm.
The ratio ((W5d / W41) × 100) of the length W5d of the non-skin facing surface side of the non-skin-side vertical groove to the full width W41 of the absorbent core was 13%. The length was 10 mm.

<Example 2>
A sanitary napkin having the same basic configuration as the sample created in Example 1 except that the absorbent body 4 shown in FIG. 6 is used instead of the absorbent body 4 shown in FIG. Samples of In the absorbent body 4 shown in FIG. 6, the length W5d on the non-skin facing surface side of the non-skin-side vertical groove portion and the length W5u on the skin-facing surface side are the same length, and the top 5t side of the non-skin-side vertical groove portion To the non-skin facing surface side.
Specifically, the ratio ((W5d / W41) × 100) of the length W5d (length W5u on the skin facing surface side) of the non-skin facing surface side of the non-skin side longitudinal groove portion to the full width W41 of the absorbent core is 2.5%. The length W5d and the length W5u were 2 mm.

<Comparative Example 1>
A sanitary napkin having the same basic configuration as that of the sample created in Example 1 except that the absorbent body 4C shown in FIG. 7 is used instead of the absorbent body 4 shown in FIG. Samples of Regarding the absorbent body 4C shown in FIG. 7, constituent parts different from those of the absorbent body 4 shown in FIG. 3 will be mainly described, and the same constituent parts will be denoted by the same reference numerals and description thereof will be omitted. The description of the absorbent body 4 shown in FIG. The absorbent body 4C shown in FIG. 7 has a longitudinal groove portion 5C that is disposed on the skin facing surface side of the central core region CT in the absorbent core 41 at a position overlapping the longitudinal center line CL and extends along the longitudinal direction X. It was. The longitudinal groove portion 5 </ b> C was formed to be recessed from the skin facing surface of the absorbent core 41 toward the non-skin facing surface side. In the absorbent body 4 </ b> C shown in FIG. 7, the longitudinal groove 5 </ b> C is formed with the same groove width from the skin facing surface of the absorbent core 41 toward the non-skin facing surface.
Specifically, the ratio ((W5C / W41) × 100) of the groove width W5C of the longitudinal groove portion 5C to the entire width W41 of the absorbent core was 2.5%. The groove width W5C was 2 mm.

[Evaluation]
About the sample (Sanitary napkin) of Examples 1-2 and the sample (Sanitary napkin) of the comparative example 1, the diffusion distance of a vertical direction and a horizontal direction, and the state of a deformation | transformation were measured with the following method, respectively. The results are shown in Table 1 below.

<Method for measuring body fluid diffusion distance in vertical and horizontal directions>
A drive-type adult female human body model capable of injecting liquid from the excretion point was used, and the model to be evaluated was placed on its back after the sample to be evaluated was mounted while the model was upright. Next, after repeating a series of operations of compressing the crotch part of the model from 60 mm to 20 mm and then releasing it to 20 mm or 60 mm 10 times, using a liquid discharge pump with a speed adjustment function, simulated from the excretion point Blood was injected every 3 minutes for a total of 12 g, 3.0 g. Samples were removed from the model and the longitudinal and lateral diffusion distances from the excretion point in the absorbent core produced in the samples by simulated blood injection were measured.

<Evaluation method of deformation state>
In the measurement method of the body fluid diffusion distance in the longitudinal direction and the lateral direction, the width direction of the sample when the samples of Examples 1 and 2 and Comparative Example 1 were removed from the adult female human body model after the pseudo blood injection. The cross-sectional deformation state was observed.
In the section taken along the line II-II in FIG. 1 A: The central portion in the width direction of the sample is deformed into a convex shape (the sample is deformed into a W shape).
B: The center in the width direction of the sample is deformed into a concave shape

  As shown in Table 1, it was found that the sanitary napkins of Examples 1 and 2 were stably deformed into a W shape as compared with the sanitary napkin of Comparative Example 1. In addition, as shown in Table 1, the sanitary napkins of Examples 1 and 2 have a shorter body fluid diffusion distance in the longitudinal direction than the sanitary napkin of Comparative Example 1, and the so-called liquid that spreads along the skin. It was found that no jump occurred. From these facts, the sanitary napkins of Examples 1 and 2 have the raised portions corresponding to the middle and high portions raised from the non-skin-side longitudinal groove portions in a convex shape compared to the sanitary napkin of Comparative Example 1, and the skin With the side groove as a flexible shaft, both sides of the napkin are bent toward the wearer's skin and are easy to deform so as to draw a substantially W shape as a whole, and it is difficult to create a gap between the wearer's skin and fit. It can be expected that the leakage prevention performance against side leakage and leakage through the skin will be improved.

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 10 Absorbent main body 2 Top surface sheet 3 Back surface sheet 4 Absorber 41 Absorbent core 42 Core wrap sheet 43 Middle-high part 5 Non-skin side vertical groove part 5t Top part of non-skin side vertical groove part 6 Compression groove 61 Horizontal pressing groove 62 Skin side vertical groove part (Vertical squeezing groove)
7 Sheet A for forming a leak-proof cuff Front part B Excretion part opposite part C

Claims (8)

It has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction, has a long absorbent core in the longitudinal direction, and has an excretory part facing part disposed opposite to the liquid excretion part of the wearer An absorbent article,
The absorbent core is divided into a central core region located in the lateral center and lateral core regions located laterally outward from the central core region,
On the skin-facing surface side of the excretory part-facing portion in the central core region, it has a middle-high part that protrudes to the skin side from the skin-facing surface of the side core region,
A non-skin-side longitudinal groove portion that is disposed on the non-skin facing surface side of the central core region at a position overlapping with a virtual bisector extending in the longitudinal direction passing through the center in the lateral direction of the absorbent article and extending along the longitudinal direction. Have
The basis weight of the portion where the non-skin side vertical groove portion is arranged is an absorbent article formed by reducing the basis weight of the absorbent core forming material as compared to the laterally adjacent portion of the non-skin side vertical groove portion. .   The absorbent article according to claim 1, wherein the non-skin side longitudinal groove portion is formed with a depth larger than a thickness of the side core region.   The absorbent article according to claim 1 or 2, wherein the non-skin-side vertical groove portion is formed such that a length in a vertical direction is longer than a length in a vertical direction of the middle-high portion.   The non-skin side longitudinal groove portion is related to the length in the lateral direction when viewed in cross section, and the length of the non-skin side of the central core region of the absorbent core is greater than the length of the central core region on the skin facing surface side. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is long.   The said absorptive core has a pair of skin side vertical groove part extended in the vertical direction in the position which pinches | interposes the said middle-high part in the width direction on the skin opposing surface side. Absorbent articles.   The absorptive article according to claim 5 whose length of the vertical direction of said non-skin side vertical groove part is longer than the full length of the vertical direction of said skin side vertical groove part.   The absorbent article according to any one of claims 1 to 6, wherein the non-skin side longitudinal groove portion is disposed over the entire length in the longitudinal direction of the absorbent core.   The absorbent article according to any one of claims 1 to 7, wherein in the absorbent core, the central core region having the middle and high portions and the side core regions are integrally formed.

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