JP7015685B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as menstrual napkins, panty liners, and incontinence pads, and more specifically, absorption in which an annular upper layer absorber that adheres along the wearer's labia majora is arranged on the skin side of the lower layer absorber. Regarding sex goods.

Conventionally, as the absorbent article, a cotton-like pulp or the like is used between a water-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated non-woven fabric and a liquid-permeable front sheet such as a non-woven fabric or a liquid-permeable plastic sheet. It is known that the material is mediated by an absorber.

Many menstrual napkins for night use that prevent leakage of body fluids at bedtime, etc. are offered on the market with thick absorbers to secure the amount of absorption, but the thick absorbers are stiff. There was a problem that the fit was deteriorated. In recent years, even for menstrual napkins for night use, thinner ones have been required in order to improve the wearing feeling. However, if the absorber is simply made thinner, there is a risk of leakage due to insufficient absorption and poor fit with the blood drainage port, which causes anxiety to the wearer.

Many improvements have been made to this type of absorbent article, and one that adheres to the blood drainage port to prevent leakage has been developed. For example, in Patent Document 1 below, a bag having an opening for accommodating the wearer's labia minora inside and having an opening peripheral portion for locating the wearer's labia majora outside the opening. Formed in the form of an absorber accommodating member, a protruding anterior contact portion formed in the front portion of the absorber accommodating member for contacting the anterior portion of the wearer's clitoris, and a rear portion of the absorber accommodating portion. Disclosed is a female absorber article comprising a protruding posterior contact portion for contacting the wearer's perineal portion.

Further, in Patent Document 2 below, the absorber has an annular ridge portion long in the anteroposterior direction in the central region between both sides of the skin contact surface side of the absorber, and the non-skin contact surface side of the ridge portion is the ridge direction. A sanitary napkin that is recessed in the skin is disclosed.

Japanese Unexamined Patent Publication No. 2006-288550 Jitsukaihei 6-31722 Gazette

However, in the absorbent article described in Patent Document 1, when a thin sheet material is used as the peripheral portion of the opening in contact with the labia majora, the movement of the body causes twisting and curling, and the body fluid easily leaks. There was a fear.

Further, in the absorbent article described in Patent Document 2, since the non-skin contact surface side of the annular raised portion is recessed in the raised direction, the body pressure acting at the time of wearing and the compression when the absorbent article is folded at the time of individual packaging. There is a problem that the annular ridge is easily crushed by a force or the like. In particular, when a thin absorber is used to improve the wearing feeling, the annular ridge portion becomes more easily crushed.

Therefore, a main object of the present invention is to provide an absorbent article that can adhere to the skin surface of the wearer and prevent leakage of body fluid even if the absorbent body is made thin in order to improve the wearing feeling.

In order to solve the above problems, as the present invention according to claim 1, at least in an absorbent article provided with an absorber.
The absorber comprises a lower absorber on the non-skin side and an upper absorber annularly arranged on the skin side of the lower absorber along the labia majora of the wearer .
The skin side surface of the upper layer absorber is inclined so as to protrude toward the skin side toward the outside, and the inner side surface of the upper layer absorber is formed by an inclined surface inclined inward toward the skin side. An absorbent article comprising the above is provided.

In the invention according to claim 1, since the annular upper layer absorber is laminated on the skin side of the lower layer absorber, the annular upper layer absorber is less likely to be twisted or crushed, and the annular shape is less likely to occur. The upper absorber can be firmly attached to the wearer's labia majora to prevent the leakage of body fluid.

In addition, since the upper layer absorber formed in a ring shape is in close contact with the wearer's labia majora, even if the lower layer absorber is made thinner, the leakage of body fluid can be surely prevented, and both good wearing comfort and prevention of leakage can be achieved. Absorbent articles can be provided.

The skin side surface of the upper layer absorber is inclined so as to protrude toward the skin side toward the outside . That is, in order to make it easier for the skin side surface of the upper layer absorber formed in a ring shape to be in close contact with the wearer's labia majora, the shape is inclined along the curved shape of the body that bulges outward from the labia majora. This makes it easier for the skin side of the upper absorber to come into close contact with the labia majora, preventing leakage of body fluids, and even if the wearing position is slightly laterally displaced due to body movement, the size of the wearer at the time of wearing naturally is large. It becomes easier to maintain the state where the skin side surface of the upper layer absorber is in close contact with the body by returning to the state where it is in close contact with the labia majora.

On the other hand, the inner side surface of the upper layer absorber is formed by an inclined surface that inclines inward toward the skin side. When the body fluid received in the area surrounded by the annular upper absorber tries to flow outward, the inner side surface acts like a wave, so that the leakage of the body fluid to the outside can be prevented more reliably. become.

According to the second aspect of the present invention, the upper layer absorber contains a highly water-absorbent resin, and the content ratio of the highly water-absorbent resin is set to be higher on the skin side than on the non-skin side. The absorbent article according to Item 1 is provided.

In the invention according to claim 2 , the content ratio of the highly water-absorbent resin in the upper layer absorber is set to be higher on the skin side than on the non-skin side, so that each time the upper layer absorber absorbs the body fluid, the high water absorption is achieved. The swelling of the resin causes the skin side of the upper layer absorber to bulge toward the skin surface, improving the adhesion between the upper layer absorber and the skin surface, making it difficult to shift even when moving, and preventing body fluid leakage more reliably. become able to.

According to the third aspect of the present invention, a plurality of concave grooves recessed on the non-skin side along the longitudinal direction of the absorbent article and at intervals in the width direction of the absorbent article are formed on the skin side surface of the lower layer absorber. The absorbent article according to any one of claims 1 and 2 formed is provided.

In the invention according to claim 3 , a plurality of concave grooves recessed on the non-skin side are formed on the skin side surface of the lower layer absorber at intervals in the longitudinal direction of the absorbent article and in the width direction of the absorbent article. By forming, the body fluid received in the region surrounded by the annular upper layer absorber can be diffused in front of and behind the lower layer absorber along the concave groove, and the lower layer absorption in the region surrounded by the upper layer absorber can be performed. It is possible to prevent the amount of absorption by the body from exceeding the capacity, and it becomes possible to efficiently absorb body fluid in a wide range of the lower layer absorber.

According to the fourth aspect of the present invention, a plurality of concave grooves recessed on the non-skin side along the width direction of the absorbent article and at intervals in the longitudinal direction of the absorbent article are formed on the skin side surface of the upper layer absorber. The absorbent article according to any one of claims 1 to 3 formed is provided.

In the invention according to claim 4 , a plurality of concave grooves recessed on the non-skin side are formed on the skin side surface of the upper layer absorber at intervals in the width direction of the absorbent article and in the longitudinal direction of the absorbent article. By forming, when the annular upper layer absorber is deformed along the roundness of the front and back of the body, wrinkles and twists are less likely to occur, the annular upper layer absorber is more easily fitted to the shape of the body, and body fluid leaks. Can be prevented more reliably.

As described in detail above, according to the present invention, even if the absorber is made thinner in order to improve the wearing feeling, it can be in close contact with the wearer's skin surface and leakage of body fluid can be prevented.

It is a partially broken development view of the menstrual pad 1 which concerns on this invention. FIG. 1 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. It is a top view of the absorber 4. It is a VV line arrow view of FIG. It is a cross-sectional view (VV line arrow view of FIG. 4) of the absorber 4 which concerns on a modification. It is a top view of the upper layer absorber 11 which concerns on a modification. FIG. 7 is a view taken along the line VIII-VIII of FIG. 7. It is a top view of the absorber 4 which concerns on a modification. It is an X-X line arrow view of FIG. It is a cross-sectional view (X-X line arrow view of FIG. 9) of the absorber 4 which concerns on a modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of menstrual napkin 1]
As shown in FIGS. 1 to 3, the menstrual napkin 1 according to the present invention includes an impermeable back sheet 2 made of a polyethylene sheet or the like, menstrual blood or vaginal discharge (hereinafter collectively referred to as body fluid). ) Is rapidly permeated through the liquid-permeable surface sheet 3, the absorber 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and the length on both sides of the skin contact surface side. A side non-woven fabric 7 provided over substantially the entire length along the direction is provided, and around the absorber 4, the impermeable back sheet 2 and the liquid-permeable front sheet 3 are provided at the upper and lower end edges thereof. The outer edge portion is bonded by an adhesive such as hot melt, heat seal, ultrasonic seal, or the like, and the impermeable back surface extending laterally from the absorber 4 at both side edges thereof. The sheet 2 and the side nonwoven fabric 7 are joined by an adhesive such as hot melt or a joining means such as a heat seal or an ultrasonic seal to form a flap portion in which an absorber does not intervene. Although not shown, the absorber 4 may be surrounded by an encapsulating sheet made of crepe paper, non-woven fabric, or the like in order to maintain the shape of the absorber 4 and improve the diffusivity. Further, although not shown, a second sheet made of a hydrophilic non-woven fabric or the like having substantially the same shape as the liquid-permeable surface sheet 3 may be arranged adjacent to the non-skin side of the liquid-permeable surface sheet 3. ..

Hereinafter, the structure of the menstrual napkin 1 will be described in more detail.
As the impermeable back sheet 2, a sheet material having at least water impermeability such as polyethylene is used, but it is desirable to use a sheet material having moisture permeability from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. Sheets are preferably used. On the non-skin side surface (outer surface) of the impermeable back sheet 2, one or a plurality of adhesive layers (not shown) are formed along the longitudinal direction of the napkin, and the menstrual napkin 1 is attached when attached to the body. It is designed to be fixed to underwear. As the impermeable back sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is quickly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a high melting point fiber as a core and a low melting point fiber as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

In the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorber 4, as shown in the cross-sectional views of FIGS. 2 and 3, and only covers the absorber 4. The outer side of the stop is for the purpose of preventing the penetration of side non-woven fabric 7, which is different from the liquid-permeable surface sheet 3, specifically, menstrual blood, cages, etc., or for enhancing the feel of the skin. Correspondingly, the side nonwoven fabric 7 configured by using the nonwoven fabric material which has been appropriately subjected to water repellent treatment or hydrophilic treatment is arranged. As the side nonwoven fabric 7, one made of natural fiber, synthetic fiber, recycled fiber or the like and formed by an appropriate processing method can be used, but it is preferable to eliminate the feeling of stiffness and prevent stuffiness. Therefore, it is better to use a non-woven fabric that has a low basis weight and has breathability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 13 to 23 g / m ² , and in order to surely prevent the permeation of body fluids, a silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. A water-repellent treated non-woven fabric coated with is preferably used.

As shown in FIGS. 2 and 3, the side nonwoven fabric 7 adheres a hot melt or the like to the outer portion from the intermediate portion in the width direction over a range from a predetermined inner position to the outer edge of the impermeable back sheet 2. Flap portions in which the absorber 4 does not intervene are formed on both side portions of the absorber 4 by the laminated sheet portions of the side nonwoven fabric 7 and the impermeable back sheet 2 which are adhered with the agent. This flap portion forms a pair of left and right wing-shaped flaps W, W at the position on the side of the absorber, which substantially corresponds to the body fluid discharge portion H, and the flaps for hip hold _WB , W at the position on the buttocks side (rear side). _B may be formed. Adhesive layers (not shown) are provided on the outer surface sides of the wing-shaped flaps W and W and the hip-holding flaps _WB and _WB , respectively, and the wing-shaped flaps W and W are used as base ends when attached to shorts. It is folded back to the opposite side at the folding line RL position of the portion, wrapped around the crotch portion of the shorts and fastened, and the hip hold flap _WB is fastened to the inner surface of the shorts.

On the other hand, the inner side portion of the side nonwoven fabric 7 is folded back substantially in double, and one or more of the double sheets are fixed at both ends or appropriate positions in the longitudinal direction in the middle portion in the height direction. In the illustrated example, the three thread-like elastic elastic members 9, 9 ... Are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. As shown in FIG. 3, this double sheet portion is bonded to the absorber 4 side in a state where it is folded back once and laminated to the outside as shown in FIG. A pair of left and right three-dimensional gathered BSs and BSs that stand up on the surface side while tilting are formed.

〔Absorber〕
Hereinafter, the absorber 4 will be described in detail. As shown in FIGS. 4 and 5, the absorber 4 is composed of a lower layer absorber 10 on the non-skin side and an upper layer absorber 11 on the skin side. The upper layer absorber 11 is arranged in a ring shape on the skin side of the lower layer absorber 10 along the labia majora of the wearer. It is desirable that the absorber 4 has a two-layer structure in which the upper absorber 11 is laminated on the skin side of the lower absorber 10.

The lower layer absorber 10 and the upper layer absorber 11 are each composed of, for example, cotton-like pulp and a highly water-absorbent resin. The highly water-absorbent resin is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price.

Further, synthetic fibers may be mixed with at least one of the lower layer absorber 10 and the upper layer absorber 11. As the synthetic fiber, for example, polyolefin-based fibers such as polyethylene or polypropylene, polyester-based fibers such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based fibers such as nylon, and copolymers thereof can be used, and these two types can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

The lower layer absorber 10 is formed in a substantially flat flat plate shape composed of vertically long substantially quadrangles arranged over substantially the entire length of the sanitary napkin 1, and the front and rear outer lines match the outer lines of the sanitary napkin 1. It is formed in a curved shape that bulges outward.

The lower layer absorber 10 is preferably formed thin in order to improve the wearing feeling. The basis weight is not particularly limited, but is preferably 50 to 250 g / m ² , and the thickness is also not particularly limited, but is preferably 1 to 3 mm.

The upper layer absorber 11 is formed to have a smaller width and longitudinal dimension than the lower layer absorber 10, and is located at a position corresponding to the blood drainage port of the wearer in the lower layer absorber 10, specifically, the lower layer absorber. It is the central portion in the width direction of 10 and is arranged at a position closer to the front side in the middle portion in the front-rear direction. The upper layer absorber 11 is a portion thickened toward the skin side from the skin side surface of the lower layer absorber 10, and is circular along the wearer's labia majora so that the skin side surface is in contact with the wearer's labia majora. It is formed. The bottom surface of the relatively recessed region surrounded by the upper layer absorber 11 is formed substantially flush with the skin side surface of the lower layer absorber 10 arranged outside the upper layer absorber 11. In the wearing state of the menstrual napkin 1, the skin side surface 12 of the upper layer absorber 11 is in contact with the labia majora of the wearer, and the area surrounded by the annular upper layer absorber 11 is at least the vaginal opening of the wearer. , Preferably the entire labia majora is located. Therefore, the discharged menstrual blood is received in the region surrounded by the upper layer absorber 11 and is absorbed by the lower layer absorber 10 and the upper layer absorber 11. The upper layer absorber 11 is formed in a vertically long elliptical shape or an oval shape that is long in the anteroposterior direction of the menstrual napkin 1 according to the shape of the blood drainage port of the wearer.

The upper layer absorber 11 may be simply laminated on the skin side surface of the lower layer absorber 10 or may be adhered by an adhesive such as hot melt. Further, in a state where the liquid-permeable surface sheet 3 is laminated on the skin side of the upper layer absorber 11, the liquid-permeable surface sheet 3 is placed on the skin side surface of the liquid-permeable surface sheet 3 at least on both sides of the upper layer absorber 11 along the longitudinal direction. The upper layer absorber 11 may be fixed to the lower layer absorber 10 by providing an embossed groove in which the liquid permeable surface sheet 3 and the lower layer absorber 10 are integrally recessed on the non-skin side. The embossed grooves may be provided along the outer edge of the upper layer absorber 11 over the entire circumference, or may be provided along the longitudinal direction at least on both sides of the region surrounded by the upper layer absorber 11. ..

As described above, in the present sanitary napkin 1, since the annular upper layer absorber 11 is laminated on the skin side of the lower layer absorber 10, the annular upper layer absorber 11 is twisted or crushed due to the cushioning property peculiar to the absorber. The annular upper layer absorber 11 protruding toward the skin is in close contact with the wearer's labia majora, and the discharged menstrual blood is received and absorbed in the area surrounded by the upper layer absorber 11. Because it works, it can surely prevent the leakage of body fluid.

Further, since the upper layer absorber 11 formed in a ring shape is in close contact with the wearer's labia majora, even if the lower layer absorber 10 is made thinner, the leakage of body fluid can be surely prevented, and both good wearing comfort and prevention of leakage can be achieved. You will be able to make it. Therefore, even in a night napkin such as the present menstrual napkin 1, the lower layer absorber 10 can be made thinner to improve the wearing feeling.

As shown in FIG. 5, it is preferable that the skin side surface 12 of the upper layer absorber 11 is an inclined surface that gradually protrudes toward the skin side toward the outside. As a result, the skin side surface 12 of the upper layer absorber 11 easily adheres to the labia majora of the wearer having a curved shape that bulges outward, as shown by the alternate long and short dash line in the figure, and prevents the leakage of body fluid. In addition, even if the wearing position is slightly laterally displaced due to the movement of the body, it naturally returns to the state of being in close contact with the labia majora of the wearer at the time of wearing, and the skin side surface 12 of the upper layer absorber 11 is in close contact with the body. Is easier to maintain.

The inclination angle α of the skin side surface 12 (the angle formed by the inward extension line of the skin side surface 12 and the skin side surface of the lower layer absorber 10 in the deployed state of the sanitary napkin 1 before wearing) is the curvature of the body. It is preferably 20 to 60 °, preferably 20 to 40 ° so that it can be easily adhered to the shape.

The cross-sectional shape of the skin side surface 12 may be a straight line as shown in FIG. 5, or may be a curved line recessed toward the skin side as shown in FIG. 6 (A). That is, it is desirable to have a shape that does not bulge toward the skin side. If the shape bulges toward the skin side, it is difficult to adhere to the shape of the body, and when the highly water-absorbent resin contained in the upper layer absorber 11 absorbs water and swells, the central portion of the skin side surface 12 swells. Since it is easy to put out, it swells toward the skin side more and it becomes difficult to adhere to the shape of the body.

The cross-sectional shape of the portion of the upper layer absorber 11 other than the skin side surface 12 is not particularly limited, but as shown in FIG. 5, it is preferable to form a chevron shape that gradually narrows toward the skin side. Of both side surfaces, the outer surface 13 is preferably formed as an inclined surface that inclines inward toward the skin side, as shown in FIG. This can prevent the upper layer absorber 11 from falling outward.

On the other hand, the inner side surface 14 is formed by a vertical surface that stands perpendicular to the skin side surface of the lower absorber 10 as shown in FIG. 5, or is formed on the skin side as shown in FIG. 6 (B). It is preferably formed by an inclined surface that inclines inward toward the surface. As a result, more body fluid can be received in the area surrounded by the annular upper layer absorber 11 , and when formed on the inclined surface, the body fluid received in this area will flow outward. At this time, the inner side surface 14 acts like a wave, and the leakage of body fluid to the outside can be prevented more reliably (see FIG. 6 (B)).

The thickness H of the upper layer absorber 11 (the length in the thickness direction of the absorber 4 between the skin side surface of the lower layer absorber 10 and the portion of the upper layer absorber 11 located on the most skin side) is 4 to 10 mm. preferable. As a result, even if the lower layer absorber 10 is made thinner, it becomes easier to maintain the state in which the upper layer absorber 11 is in close contact with the wearer's labia majora. The basis weight of the upper layer absorber 11 is preferably 150 to 450 g / m ² .

Further, the width B of the upper layer absorber 11 (the width of the base end portion of the upper layer absorber 11) is preferably 5 to 25 mm, preferably 10 to 20 mm. As a result, the upper layer absorber 11 can be stably arranged, and the skin side surface 12 of the upper layer absorber 11 easily adheres to the wearer's labia majora.

As shown in FIG. 4, the planar dimensions of the region surrounded by the annular upper layer absorber 11 are such that the length La of the sanitary napkin 1 in the longitudinal direction is 40 to 80 mm and the length Lb in the width direction is 15. It is preferably about 35 mm. If the size of this region is too large, the upper layer absorber 11 will be located outside the wearer's labia majora, and the adhesion between the upper layer absorber 11 and the labia majora will decrease. On the other hand, if it is too small, the amount of body fluid that can be received in this region is small, and leakage may occur.

The upper layer absorber 11 is preferably set so that the content ratio of the highly water-absorbent resin is higher on the skin side than on the non-skin side. That is, the content ratio of the highly water-absorbent resin in the portion of the upper layer absorber 11 arranged on the skin side is set to be higher than the content ratio of the highly water-absorbent resin in the portion arranged on the non-skin side. It is preferable to do so. As a result, each time the upper layer absorber 11 absorbs the body fluid, the skin side surface 12 of the upper layer absorber 11 rises toward the skin side due to the swelling of the highly water-absorbent resin, so that the upper layer absorber 11 and the skin surface are in close contact with each other. The sex is improved, it is hard to slip even if it moves, and the leakage of body fluid can be prevented more reliably. In order to change the content ratio of the highly water-absorbent resin, the amount of the highly water-absorbent resin mixed in the pulp during fiber stacking may be adjusted. The content ratio of the highly water-absorbent resin may be divided into approximately half of the skin side portion and the non-skin side portion of the upper layer absorber 11 and may be changed in these portions, or may be changed from the non-skin side to the skin side. It may be changed so as to gradually increase. The content ratio of the highly water-absorbent resin is preferably such that the ratio of the portion having the largest amount on the skin side to the portion having the least amount on the non-skin side is about 1.5 to 3 times.

As shown in FIGS. 7 and 8, the skin side surface of the upper layer absorber 11 is on the non-skin side along the width direction of the menstrual napkin 1 and at intervals in the longitudinal direction of the menstrual napkin 1. It is preferable to form a plurality of recessed grooves 15, 15 ... For deformation. By providing the deformation groove 15, when the portion where the upper layer absorber 11 is arranged is deformed along the front and rear roundness of the body when the sanitary napkin 1 is attached, the deformation groove 15 ... Since the upper layer absorber 11 is more likely to bend as a flexible axis, unnecessary wrinkles and twists are less likely to occur in the upper layer absorber 11, the annular upper layer absorber 11 is more likely to fit the shape of the body, and body fluid leaks. Can be prevented more reliably. The deformation groove 15 may be an embossed portion provided by pressing the upper layer absorber 11 from the skin side, or may be a slit portion provided by not stacking the fibers when the upper layer absorber 11 is stacked. The deformable concave groove 15 may be formed at a depth at which the upper layer absorber 11 is easily deformed along the shape of the wearer's labia majora, and if it is made too large, body fluid leaks from the deformable concave groove 15. Since there is a possibility that it will come out, it is preferable that the height is about 2/3 of the height of the upper layer absorber 11 at the maximum. Further, the depth of the deformation groove 15 may be made shallow in the portion where the roundness is gentle and deep in the portion where the roundness is tight, in accordance with the roundness of the front and back of the body in the labia majora of the wearer.

On the other hand, as shown in FIGS. 9 and 10, the skin side surface of the lower layer absorber 10 is non-skinned along the longitudinal direction of the menstrual napkin 1 and at intervals in the width direction of the menstrual napkin 1. It is preferable to form a plurality of liquid diffusion concave grooves 16, 16 ... Which are recessed on the side. As a result, the body fluid received in the region surrounded by the annular upper layer absorber 11 can be diffused in front of and behind the lower layer absorber 10 along the liquid diffusion concave groove 16, and is surrounded by the upper layer absorber 11. It is possible to prevent the absorption amount of the lower layer absorber 10 from exceeding the capacity in the region, and it becomes possible to efficiently absorb the body fluid in a wide range of the lower layer absorber 10. The liquid diffusion concave groove 16 may be an embossed portion provided by pressing the lower layer absorber 10 from the skin side, or may be a slit portion provided by not stacking fibers when the lower layer absorber 10 is stacked. The liquid diffusion concave groove 16 is preferably provided over substantially the entire width of the lower layer absorber 10, but may be provided at least within the width in which the upper layer absorber 11 is arranged.

Further, as shown in FIG. 11, the liquid diffusion concave groove 16 may be provided with a deep groove portion 17 having a relatively deep groove depth in a portion where the upper layer absorber 11 is laminated. Since the body fluid is difficult to diffuse in the portion where the upper layer absorber 11 is laminated, the body fluid can be more smoothly diffused back and forth by partially increasing the depth of the concave groove.

In order to manufacture the absorber 4, the lower layer absorber 10 may be manufactured by stacking fibers, and then the upper layer absorber 11 may be further stacked on the skin side surface of the lower layer absorber 10 by a two-stage stacking fiber. Then, it may be produced by squeezing the central portion of the absorbent body, which has been laminated on the skin side surface of the lower layer absorber 10 according to the outer shape of the upper layer absorber 11, by post-processing after the fiber stacking. Of these manufacturing methods, it is particularly preferable to use the former two-stage stacked fiber. In the method using the two-stage fiber stacking fiber, the absorber in the region surrounded by the upper layer absorber 11 is not squeezed, so that the body fluid received in this region through the large voids provided between the pulp fibers is the lower layer absorber 10. After that, it diffuses in the plane direction due to the capillary action of pulp fibers. Since the present sanitary napkin 1 is premised on the use of a thin absorber, if it is squeezed after the fiber stacking, the entire absorber becomes hard and there is a possibility that the body fluid does not easily permeate.

1 ... sanitary napkin, 2 ... impermeable back sheet, 3 ... liquid permeable front sheet, 4 ... absorber, 7 ... side non-woven fabric, 10 ... lower layer absorber, 11 ... upper layer absorber, 12 ... skin side surface, 15 ... concave groove for deformation, 16 ... concave groove for liquid diffusion

Claims (4)

At least in absorbent articles equipped with absorbers
The absorber comprises a lower absorber on the non-skin side and an upper absorber annularly arranged on the skin side of the lower absorber along the labia majora of the wearer .
The skin side surface of the upper layer absorber is inclined so as to protrude toward the skin side toward the outside, and the inner side surface of the upper layer absorber is formed by an inclined surface inclined inward toward the skin side. An absorbent article characterized by. The absorbent article according to claim 1 , wherein the upper layer absorber contains a highly water-absorbent resin and the content ratio of the highly water-absorbent resin is set to be higher on the skin side than on the non-skin side. 2. Absorbent article described in any. Claims 1 to 3 in which a plurality of concave grooves recessed on the non-skin side are formed on the skin side surface of the upper layer absorber along the width direction of the absorbent article and at intervals in the longitudinal direction of the absorbent article. Absorbent article described in any.

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