JP6839955B2 - Absorbent article - Google Patents

Description

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

For women's absorbent articles such as sanitary napkins and panty liners, as so-called night napkins, absorbent articles that are long in the vertical direction along the front-back direction of the wearer are used. It is known that such an absorbent article has a flap portion at the rear portion arranged near the back of the wearer in order to prevent leakage of excrement such as menstrual blood. Further, it is desired that the skin is deformed to fit the wearer's body shape and adheres to the wearer's skin with good fit.

For example, the absorbent article described in Patent Document 1 includes a hip flap portion that protrudes outward in the width direction from the outer edge in the width direction of the main body portion behind the central region including the center of the discharge port contact region. The hip flap portion is provided with a side adhesive portion on the non-skin contact surface side, and the hip flap portion is located behind the first constricted portion and the first constricted portion and is wider than the first constricted portion. A first flap portion that protrudes outward in the direction and includes a portion having the maximum width of the hip flap portion, and a first flap portion that is located in front of the first constriction portion and projects outward in the width direction from the first constriction portion. It is provided with two flap portions, and the side adhesive portion is arranged on the non-skin contact surface side of the first flap portion. According to Patent Document 1, it is said that the fixed state of the hip flap portion when a force is applied from the outside to the inside in the width direction of the central region is improved.

Further, Patent Document 2 has flap portions on both side portions of the main body portion so that the absorber does not intervene, and in the unfolded state, the width direction length between the both side edges of the region corresponding to the width direction folding line position is determined. Described are absorbent articles characterized in that they are formed to be relatively smaller than the widthwise length of the anterior-posterior region. According to Patent Document 2, when the absorbent article is folded into an individual package state, the flap portion at the width direction folding line position is significantly reduced from being doweled and wrinkled, and therefore the flap portion is opened after opening. It is said that even if it is unfolded, no creases or wrinkles will remain on the flap part, and it will be possible to wear it without discomfort.

Further, the applicant has previously provided a central slit region formed by dispersing vertical slits in the central portion of the absorber facing the excretion portion, and a rear slit extending in the lateral direction in the rear portion of the absorber. We have proposed an absorbent article having a rear slit region formed intermittently in the vertical direction (Patent Document 3). According to the absorbent article described in Patent Document 3, deep wrinkles and twists are less likely to occur, the fit is improved, and the wearing feeling is improved. The vertical direction is a direction corresponding to the front-back direction of the wearer of the absorbent article, and the horizontal direction is a direction orthogonal to the vertical direction.

Japanese Unexamined Patent Publication No. 2014-36832 Japanese Unexamined Patent Publication No. 2010-82061 Japanese Unexamined Patent Publication No. 2015-23999

Vertically long absorbent articles such as so-called night napkins are required to adhere to the wearer's skin, but the longer the absorbent articles are in the vertical direction, the more wrinkles and flaps are required. There is a problem that turning over is likely to occur. Patent Documents 1, 2 and 3 do not describe a solution for improving the adhesion to the skin of the wearer and suppressing the occurrence of wrinkles and curling of the flap portion.

An object of the present invention is to provide an absorbent article capable of improving the adhesion to the skin of the wearer and suppressing the occurrence of wrinkles and curling of the flap portion.

The present invention has a vertical direction along the front-rear direction of the wearer and a horizontal direction orthogonal to the vertical direction, and also has a front surface sheet, a back surface sheet, and an absorber arranged between both sheets, and has a back of the wearer. It is an absorbent article having rear flaps on both sides of the rear portion arranged closer to each other, and the rear portion has a plurality of slits cut in the thickness direction of the absorber and separated in the lateral direction. The rear flap portion has a slip-preventing portion on the non-skin facing surface side of the rear flap portion, and the position of the slip-preventing portion in the vertical direction overlaps with the slit, and the rear flap portion has the same. Provided is an absorbent article having a pair of recesses forming a constriction on both side edges of a rear flap along the longitudinal direction, wherein the constriction is formed posterior to the anti-slip portion in the longitudinal direction. Is what you do.

According to the present invention, there is provided an absorbent article capable of improving the adhesion to the skin of the wearer and suppressing the occurrence of wrinkles and curling of the flap portion.

FIG. 1 is a plan view schematically showing a skin-facing surface side (surface sheet side) of a sanitary napkin according to an embodiment of the absorbent article of the present invention. FIG. 2 is an enlarged schematic view showing the positional relationship between the constricted portion, the joint portion, and the groove in FIG. FIG. 3 is a cross-sectional view schematically showing the cross section taken along line I-I of FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II-II of FIG.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on the preferred embodiment thereof. 1 to 4 show a sanitary napkin 1 which is an embodiment of an absorbent article of the present invention. As shown in FIG. 1, the napkin 1 has a vertical direction X extending from the ventral side of the wearer to the dorsal side through the crotch portion along the front-rear direction of the wearer, and a lateral direction Y orthogonal to the vertical direction X. From the intermediate portion M including the excretory portion facing portion which is arranged to face the excretory portion of the wearer at the time of wearing, the front portion F which is arranged on the ventral side, that is, the front side of the wearer from the intermediate portion M, and the intermediate portion M. It has a rear portion R arranged on the back side, that is, the rear side of the wearer. The intermediate portion M is a portion in which the wearer's excretory portion (vaginal opening or the like) is opposed to the central portion in the lateral direction Y.

As shown in FIG. 1, the napkin 1 extends outward in the horizontal direction Y from each of the absorbent main body 10 having a long shape in the vertical direction and both side portions of the intermediate portion M of the absorbent main body 10 along the vertical direction X. It has a pair of wing portions 10W and 10W. When the absorbent article has a wing portion like the napkin 1, the intermediate portion M in the absorbent article of the present invention has a wing portion in the vertical direction (longitudinal direction, X direction in the drawing) of the absorbent article. Taking the napkin 1 as an example, it is a region sandwiched between the root of one wing portion 10W along the vertical direction X and the root of the other wing portion 10W along the vertical direction X. Further, the intermediate portion M in the absorbent article having no wing portion is generated when the absorbent article is folded into a tri-fold individual packaging form, and the absorbent article is in the lateral direction (width direction, Y direction in the drawing). ), It means an area surrounded by the first folding line and the second folding line counting from the vertical front end of the absorbent article. The “center folding line” represented by the reference numeral CFL in FIG. 1 corresponds to the second folding line referred to here.

The napkin 1 includes a liquid-retaining absorber 4 and a surface sheet 2 arranged on the skin-facing surface side of the absorber 4. More specifically, the absorbent body 10 constituting the napkin 1 has a front surface sheet 2 forming a skin facing surface, a back surface sheet 3 forming a non-skin facing surface, and absorption interposed between both sheets 2 and 3. It comprises a body 4. The absorbent body 10 is divided into three regions, a front portion F, an intermediate portion M, and a rear portion R, in order from the ventral side of the wearer in the vertical direction X. The vertical direction X corresponds to the longitudinal direction of the napkin 1 and the absorbent body 10, and the lateral direction Y corresponds to the width direction orthogonal to the longitudinal direction of the napkin 1 and the absorbent body 10.

In the present specification, the "skin facing surface" is a surface of the absorbent article or its constituent members (for example, the absorber 4) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively of the wearer. The side closer to the skin, the "non-skin facing surface" is the side of the absorbent article or its constituents that is opposite to the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. It is the surface to be. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained, and the absorbent article is in a state deviated from the wearing position. Does not include.

As shown in FIGS. 3 and 4, the surface sheet 2 covers the entire surface of the absorber 4 facing the skin, and the both side edges along the vertical direction X thereof are the both side edges along the vertical direction X of the absorber 4. It exists in almost the same position. On the other hand, the back surface sheet 3 covers the entire non-skin facing surface of the absorber 4, and further extends outward from both side edges along the vertical direction X of the absorber 4 in the horizontal direction Y, and the side sheet 5 described later. Aside from this, the side flap portion 10S is formed. The back surface sheet 3 and the side sheet 5 are bonded to each other by known bonding means such as an adhesive, a heat seal, and an ultrasonic seal at the extending portions from both side edges of the absorber 4 along the vertical direction X. Further, the front surface sheet 2 and the back surface sheet 3 are joined to each other by known joining means at the extending portions from both ends of the absorber 4 in the vertical direction X. The front surface sheet 2 and the back surface sheet 3 and the absorber 4 may be bonded to each other by an adhesive. As the front surface sheet 2 and the back surface sheet 3, various materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a non-woven fabric having a single-layer or multilayer structure, a perforated film, or the like can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

As shown in FIG. 1, the side flap portion 10S largely projects outward in the lateral direction Y in the intermediate portion M, whereby a pair of wings are formed on both the left and right sides of the absorbent main body 10 along the vertical direction X. Parts 10W and 10W are extended. The wing portion 10W has a substantially trapezoidal shape in which the lower base (longer side than the upper base) is located on the absorbing main body 10 side in a plan view as shown in FIG. Is formed with a wing portion adhesive portion (not shown) for fixing the wing portion 10W to clothing such as shorts. The wing portion 10W is used by being folded back toward the non-skin facing surface, that is, the outer surface side of the crotch portion of clothing such as shorts.

The napkin 1 of the present embodiment has rear flap portions on both side portions of the rear portion R arranged near the back of the wearer. As shown in FIG. 1, the side flap portions 10S greatly project outward in the lateral direction Y even in the rear portion R, whereby a pair of side flap portions 10S are provided on both the left and right sides along the vertical direction X of the absorbent main body 10. The rear flap portions 10H and 10H are extended. By providing the rear flap portion 10H, it is possible to prevent lateral leakage of excrement liquid such as menstrual blood.

The rear flap portion 10H has a slip prevention portion 52 on a non-skin facing surface. In the present embodiment, the slip prevention portion 52 is an adhesive portion, and the adhesive portion allows the rear flap portion 10H to be worn in a spread state, that is, in a state of being extended to the side of the absorbent body 10. Is fixed to. That is, the rear flap portion 10H is fixed to the skin facing surface, that is, the inner surface of the clothing via the slip prevention portion 52 (rear adhesive portion) formed on the non-skin facing surface. Before its use, the wing portion adhesive portion and the slip prevention portion 52 are covered with a release sheet (not shown) made of a film, a non-woven fabric, paper or the like.

The rear portion R of the present embodiment has a plurality of slits R1 that are cut in the thickness direction of the absorber 4 and are separated in the lateral direction. Hereinafter, the slit in the rear portion R is also referred to as a rear slit R1. The plurality of rear slits R1 make it easy for the rear portion R to be deformed along the wearer's buttocks, and the fit is improved. More specifically, the region 54 sandwiched between the plurality of rear slits R1 separated in the lateral direction Y is deformed so as to bulge toward the skin facing surface side, so that the lateral central region of the posterior portion R is formed in the buttocks. It can be brought into close contact along the shape of the groove.
Further, in the rear portion R of the present embodiment, the position of the misalignment prevention portion 52 in the vertical direction overlaps with a plurality of rear slits R1 separated in the horizontal direction (see FIG. 1). More specifically, the two rear slits R1 and R1 separated in the lateral direction are within the region sandwiched by a straight line connecting the front end portions and the rear end portions of the pair of left and right misalignment prevention portions 52, 52. Existing.
In general, a gap is likely to occur between the wearer and the napkin at a portion where the radius of curvature from the crotch portion to the rear of the wearer becomes small, and in particular, at this portion, along the buttocks between the wearer and the napkin. There is a tendency for gaps to occur. On the other hand, in the napkin 1 of the present embodiment, since the displacement prevention portion 52 and the rear slit R1 overlap in the vertical direction X, they are sandwiched between the plurality of rear slits R1 separated in the horizontal direction Y. When the region 54 is raised and deformed along the buttock groove, the lateral central region of the rear portion R tends to be in close contact with the buttock groove, and even on the lateral outer side of the buttock groove, between the skin and the napkin. It is suppressed that a gap is generated in the napkin, and leakage and liquid flow are less likely to occur. By overlapping the slip prevention portion 52 and the rear slit R1 in the vertical direction X, it is possible to further suppress the twist of the napkin 1 on the lateral outer side of the groove in the buttocks, and when a large amount of menstrual blood is excreted. However, since the napkin 1 is in close contact with the wearer's crotch to the back side where the radius of curvature becomes smaller without twisting, menstrual blood leakage is less likely to occur.

From the viewpoint of further improving the adhesion between the laterally outer portion of the buttock groove and the napkin, the displacement prevention portion 52 is located in the vertical direction as a whole of the two rear slits R1 and R1 separated in the lateral direction. Alternatively, it is preferable that it partially overlaps, and 20% or more and 100% or less, more preferably 50% or more and 100% or less of the length of each of the two rear slits R1 and R1 in the vertical direction overlap. preferable. Further, the two rear slits R1 and R1 are preferably located on both sides of the vertical center line CL of the absorbent article extending in the vertical direction X.

From the viewpoint of further improving the adhesion between the laterally outer portion of the buttock groove and the napkin, the length P1 (see FIG. 1) of the portion where the displacement prevention portion 52 and the rear slit R1 overlap in the vertical direction X is It is preferably 5.0 mm or more, more preferably 7.5 mm or more, preferably 40 mm or less, more preferably 20 mm or less, and preferably 5.0 mm or more and 40 mm or less, more preferably 7.5 mm or more and 20 mm or less. Is.
Here, the length P1 of the portion where the displacement prevention portion 52 and the rear slit R1 overlap is the length of the overlapping portion of each rear slit R1 having a portion that overlaps with the displacement prevention portion 52. When there are a plurality of rear slits R1 having different formation positions in the vertical direction, the length P1 of the overlapping portion of at least one rear slit R1 is preferably in the above range, and the two rear slits R1 are separated in the lateral direction. It is preferable that the length P1 of the overlapping portion for each of the rear slits R1 and R1 is in the above range.

From the same viewpoint as above, the length P2 (see FIG. 1) of the slip prevention portion 52 in the vertical direction X is preferably 15 mm or more, more preferably 20 mm or more, and preferably 50 mm or less, more preferably 40 mm or less. It is preferably 15 mm or more and 50 mm or less, and more preferably 20 mm or more and 40 mm or less.
The length P3 (see FIG. 1) of the misalignment prevention portion 52 in the lateral direction Y is preferably 5 mm or more and 30 mm or less, and more preferably 10 mm or more and 20 mm or less.

From the viewpoint of preventing the occurrence of twisting of the absorbent article and improving the adhesion between the laterally outer portion of the buttock groove and the rear portion R, from the rear end portion of the slip prevention portion 52 to the rear end portion of the absorbent article. The distance L2 to (see FIG. 1) is preferably 10% or more, more preferably 15% or more, and preferably 35% or less, more preferably 35% or less, based on the total length of the absorbent article 1 in the vertical direction X. It is 30% or less, preferably 10% or more and 35% or less, and more preferably 15% or more and 30% or less. The rear end portion of the absorbent article in the vertical direction X is the end portion located at the rearmost position in the vertical direction X (front and back) of the absorbent article (see FIG. 1).
The distance L2 from the rear end of the slip prevention portion 52 to the rear end of the absorbent article is preferably 40 mm or more, more preferably 60 mm or more, and preferably 140 mm or less, more preferably 120 mm or less. Further, it is preferably 40 mm or more and 140 mm or less, and more preferably 60 mm or more and 120 mm or less.

When there are a plurality of rear slits R1, it is sufficient that there is one or more rear slits R1 that overlap with the misalignment prevention portion 52 in the vertical direction, but from the viewpoint of further improving the adhesion of the napkin 1 to the skin, two are preferable. As mentioned above, it is more preferably 4 or more, preferably 10 or less, more preferably 6 or less, and preferably 2 or more and 10 or less, more preferably 4 or more and 6 or less.

In the napkin 1 of the present embodiment, as shown in FIG. 1, the rear slit R1 has a linear shape in a plan view, but the plan view shape of the rear slit R1 is not limited to this and may be a wavy line or the like. Further, the rear slit R1 preferably extends in the vertical direction X. Further, the rear slit R1 does not have to be parallel to the vertical center line CL extending in the vertical direction X by bisecting the napkin 1 or the absorber 4 in the horizontal direction Y, and in this case, the rear slit R1 and the vertical slit R1. The angle formed by the center line CL is preferably less than 45 degrees.

In the rear portion R of the present embodiment, the number of rear slits R1 may be two or more, and the number of rear slits R1 is not particularly limited, but is preferably 4 or more, more preferably 6 or more, and preferably 18. Below, it is more preferably 14 or less, preferably 4 or more and 18 or less, and more preferably 6 or more and 14 or less.
In the present embodiment, the rear portion R has a plurality of rear slits R1 in the rear slit region RS. The plurality of rear slits R1 may have the same plan view shape and the inclination angle with respect to the vertical center line CL, or may be different from each other. Further, a pattern in which two or more rear slits R1 having different positions in the horizontal direction Y are present is preferable to a pattern in which a plurality of rear slits R1 are arranged in a row in the vertical direction X.

In the napkin 1 of the present embodiment, the dimensions of each part of the rear slit R1 are preferably set as follows from the viewpoint of further improving the adhesion to the wearer's skin.
The length of the rear slit R1 in the vertical direction X is preferably 10 mm or more, more preferably 15 mm, and preferably 35 mm or less, still more preferably 25 mm or less.
The length, that is, the width of the rear slit R1 in the lateral direction Y is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.0 mm or less, further preferably 0.8 mm or less.

In the present embodiment, the rear slit R1 may or may not penetrate the laminated body of the absorbent sheets constituting the absorber 4 (see FIG. 4). Further, as shown in FIG. 4, the rear slit R1 is not formed on the front surface sheet 2 and the back surface sheet 3 arranged above and below the absorber 4, and further, between the front surface sheet 2 and the absorber 4. It is preferably not formed on an intermediate sheet made of a non-woven fabric that may be arranged.

As shown in FIG. 1, the rear flap portion 10H of the present embodiment has a pair of recesses 53a forming a constricted portion 53 at both side edges of the rear flap portion 10H along the vertical direction X. An absorbent article that is long in the vertical direction has a problem that wrinkles are likely to occur in the rear flap portion 10H, and the rear flap portion 10H is likely to be turned over due to the wrinkles. However, as in the napkin 1 of the present embodiment, by providing the constricted portion 53 in the rear flap portion 10H, the constricted portion 53 acts as a flexible shaft, suppresses the occurrence of wrinkles in the rear flap portion 10H, and suppresses the occurrence of wrinkles in the rear flap portion 10H. It is possible to suppress the turning of the portion 10H.

In the present embodiment, the constricted portion 53 is formed behind the misalignment preventing portion 52 in the vertical direction X. In general, the longer the absorbent article is in the vertical direction X, the larger the area that is not fixed by the slip prevention portion 52, so that the rear flap portion tends to be wrinkled or curled. In particular, if the misalignment prevention portion 52 is arranged at a position where the groove of the buttocks abuts in the vertical direction X, that is, at a position overlapping the rear slit R1, wrinkles and curls are likely to occur in the rear flap portion.
On the other hand, by forming the constricted portion 53 behind the slip prevention portion 52 as in the present embodiment, it is possible to effectively suppress the occurrence of wrinkles and curling in the rear flap portion 10H. It should be noted that the constriction portion 53 is formed behind the misalignment prevention portion 52 in the vertical direction X, that is, the inner end portion of the recess 53a forming the constriction portion 53 is closer to the rear end portion of the misalignment prevention portion 52. Although it means that it is located rearward, it is preferable that the entire recess 53 a is located rearward from the rear end portion of the slip prevention portion 52.

Further, from the viewpoint of more reliably suppressing the effect of suppressing wrinkles and turning in the rear flap portion 10H, the distance L1 from the rear end portion of the slip prevention portion 52 in the vertical direction X to the constricted portion 53 is shifted in the vertical direction X. It is preferably 25% or more and 75% or less with respect to the distance L2 from the rear end portion of the stopper 52 to the rear end portion of the absorbent article. Here, the distance L1 from the rear end portion of the misalignment prevention portion 52 in the vertical direction X to the constriction portion 53 is the inside of the recess 53a forming the constriction portion 53 from the rear end portion of the misalignment prevention portion 52 in the vertical direction X. It is the length to the direction end. Further, the rear end portion of the misalignment prevention portion in the vertical direction X is the end portion of the misalignment prevention portion 52 located at the rearmost position in the vertical direction X (front and back) (see FIG. 1).
The distance L1 from the rear end portion of the slip prevention portion 52 to the constricted portion 53 in the vertical direction X is more preferably a ratio of the distance L2 from the rear end portion of the slip prevention portion 52 to the rear end portion of the absorbent article. Is 30% or more, more preferably 40% or more, still more preferably 70% or less, still more preferably 60% or less, still more preferably 30% or more and 60% or less, still more preferably 40% or more and 60. % Or less.
The distance L1 from the rear end portion of the slip prevention portion 52 in the vertical direction X to the constricted portion 53 is preferably 25 mm or more, more preferably 35 mm or more, and preferably 65 mm or less, more preferably 55 mm or less. Further, it is preferably 25 mm or more and 65 mm or less, and more preferably 35 mm or more and 55 mm or less.

As shown in FIG. 1, the constricted portion 53 is formed by a recess 53a. Regarding the recess 53a, when the straight line connecting both ends of the recess 53a is a straight line L5 and the straight line passing through the inner end of the recess 53a and intersecting the straight line L5 perpendicularly is a straight line L6, from the intersection of the straight line L5 and the straight line L6. Let d be the distance to the inner end of the recess 53 a (see FIG. 2). This distance d corresponds to the length of the recess of the recess 53a. Further, this distance d is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 10 mm or less, more preferably more preferably, from the viewpoint of further suppressing the occurrence of wrinkles and curling in the rear flap portion 10H. It is 5.0 mm or less, preferably 0.5 mm or more and 10 mm or less, and more preferably 1.0 mm or more and 5.0 mm or less.

In the present embodiment, the front surface sheet 2 has a groove 6 on the surface facing the skin, in which the front surface sheet 2 and the absorber 4 are recessed toward the back surface sheet 3. Further, the groove 6 is arranged in the rear portion R as shown in FIG. 1, and has a convex portion 61 forming a convex curve toward the outside in the lateral direction as shown in FIG. ing. With such a configuration, the stability of the napkin 1 against bending in the vertical and horizontal directions can be further improved. As described above, the front surface sheet 2 has a groove 6 on the skin-facing surface in which the front surface sheet 2 and the absorber 4 are recessed toward the back surface sheet 3, and the groove 6 is flat on the rear portion R. Visually, it is preferable to have a convex portion 61 forming a convex curve toward the outside in the lateral direction Y.

Further, the groove 6 in the present embodiment has the above-mentioned convex portion 61, but the distance L3 (in the vertical direction X) between the top portion of the convex portion 61 and the inner end portion of the concave portion 53a forming the constricted portion ( (See FIG. 2) is preferably 5.0 mm or less. The distance L3 between the top and the inner end of the convex portion 61 in the vertical direction X is the position of the inner end of the concave portion 53a forming the constricted portion 53 in the vertical direction X and the top of the convex portion 61 in the groove 6. Is the distance from the position of X in the vertical direction. With such a configuration, the stability of the napkin 1 against bending in the vertical and horizontal directions can be further improved. Further, tension can be applied to the absorber 4 in the lateral direction outward, and when wrinkles are generated in the absorber 4, the transmission of wrinkles can be further suppressed. When the groove 6 has a plurality of the above-mentioned convex portions 61, the distance L3 in the vertical direction X between the top of the convex portion 61 and the inner end portion of the concave portion 53a is vertically equal to the inner end portion of the concave portion 53a. It is the distance from the top of the nearest convex portion 61 in the direction X.

From the viewpoint of more reliably achieving the above effect, the distance L3 between the top of the convex portion 61 in the groove 6 and the inner end of the concave portion 53a in the vertical direction X is more preferably 4.0 mm or less, still more preferably 4.0 mm or less. It is 3.0 mm or less, most preferably 0 mm.

Further, an inner groove 7 is formed which is located in a region surrounded by the groove 6 and has a convex shape toward the rear end of the napkin 1 in the vertical direction X. The grooves 6 and 7 are linear in a plan view. The term "linear" as used herein means that the shape of the groove, that is, the recessed portion is not limited to a straight line in a plan view, but includes a curved line. The linear grooves 6 and 7 may be continuous lines or discontinuous lines such as broken lines. The grooves 6 and 7 can exert effects such as suppressing the diffusion of the liquid in the plane direction of the absorber 4, particularly in the lateral direction Y, and preventing the absorber 4 from twisting. The grooves 6 and 7 can be formed according to a conventional method by squeezing with or without heat, or by embossing such as ultrasonic embossing. In the grooves 6 and 7, the surface sheet 2 and the absorber 4 are integrated by heat fusion or the like, and the bottom portion of the grooves 6 and 7 has a higher density than the peripheral portions thereof.

The groove 6 of the present embodiment forms a closed ring surrounding the middle-high portion 43 and the inner groove 7, which will be described later, in a plan view as shown in FIG. 1, and is formed symmetrically with respect to the vertical center line CL. The groove 6 is continuous not only from the rear portion R but also from the front portion F through the intermediate portion M to the rear portion R.

The inner groove 7 is formed symmetrically with respect to the vertical center line CL behind the middle and high portion 43 described later in the vertical direction X. Further, the inner groove 7 has a convex portion toward the rear at the rear end 70 of the vertical direction X, while the front end side of the vertical direction X, that is, the middle and high portion 43 side is open.

The napkin 1 of the present embodiment has a pair of side sheets 5 and 5 on both side surfaces in the vertical direction on the skin-facing surface of the surface sheet 2.
The side sheets 5 and 5 and the surface sheet are joined in the vertical direction by the joint portion 51. The side sheet 5 has an inner edge portion located inward in the lateral direction Y from the joint portion 51 as a free end portion. For the side sheet 5, for example, the free end side may be folded back, and an elastic member extending in the vertical direction X may be arranged inside the folded back portion. When the elastic member is arranged in this way, a leak-proof cuff is formed in which the folded-back portion stands up toward the wearer's skin side due to the contraction force of the elastic member. When the leak-proof cuff is formed in this way, it is possible to prevent lateral leakage of excreted liquid such as menstrual blood excreted on the skin-facing surface of the napkin 1.

In the napkin 1 of the present embodiment, as shown in FIGS. 1 and 2, the side sheets 5 and 5 and the surface sheet 2 alternately have an outwardly facing convex portion 51a and an inwardly facing convex portion 51a. It is joined along the vertical direction by repeated continuous wavy joints 51. Further, the position of the constricted portion 53 in the vertical direction overlaps with the convex portion 51a facing outward of the joint portion 51. As a result, the stability of the napkin 1 against bending in the vertical and horizontal directions is further improved, and the tension can be further applied to the napkin 1 in the lateral direction and outward. As shown in FIG. 2, the outwardly facing convex portion 51a of the joint portion 51 is a portion facing outward from the central line that bisects the joint portion 51 in the lateral direction. The constricted portion 53 and the convex portion 51a facing outward of the joint portion 51 may be such that the inner end portion of the concave portion 53a forming the constricted portion 53 and the convex portion 51a overlap at least partially.

From the viewpoint of more reliably achieving the above effect, the distance L7 between the outwardly facing convex portion 51a of the joint portion 51 in the lateral direction Y and the inner end portion of the concave portion 53a of the constricted portion 53 is preferably 10 mm. As described above, it is more preferably 20 mm or more, preferably 50 mm or less, more preferably 40 mm or less, and preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less. The distance L7 between the convex portion 51a and the inner end portion of the concave portion 53a means the shortest distance between the inner end portion of the concave portion 53a and the convex portion 51a in the lateral direction Y.

Explaining the absorber 4, the absorber 4 contains a highly absorbent polymer and hydrophilic fibers. As the highly absorbent polymer, a particulate polymer is generally used, but a fibrous polymer may also be used. When a particulate high-absorbent polymer is used, its shape may be spherical, lumpy, bale-shaped or amorphous. As the highly absorbent polymer, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can generally be used. Further, the hydrophilic fiber may be an inherently hydrophilic fiber or a fiber obtained by hydrophilizing a hydrophobic fiber, but the former fiber is particularly preferable. As the inherently hydrophilic fiber, natural fiber, cellulosic regenerated fiber or semi-synthetic fiber can be mentioned as a preferable example, and pulp and rayon can be exemplified as preferable ones. Examples of the pulp include wood pulp such as coniferous kraft pulp and broadleaf kraft pulp, as well as non-wood pulp such as cotton pulp and straw pulp, but the pulp is not particularly limited. Further, a crosslinked cellulose fiber obtained by cross-linking the inside and / or between the molecules of the cellulose fiber, or a bulky cellulose fiber obtained by mercerizing wood pulp may be used.

As shown in FIGS. 1, 3 and 4, the absorber 4 in the napkin 1 includes a central absorbent sheet 41 which is arranged to face the excretory portion of the wearer when worn, and a portion which overlaps the central absorbent sheet 41 in a plan view. It is composed of a main body absorbent sheet 42 having a portion extending outward from the peripheral edge of the central absorbent sheet 41, and is a laminated structure of a plurality of sheets. Both absorbent sheets 41 and 42 contain hydrophilic fibers and highly absorbent polymers.

In the present invention, the "absorbent sheet" means a sheet-like absorbent structure containing an absorbent material such as a highly absorbent polymer or a hydrophilic fiber, and is a fiber stack formed by stacking absorbent materials. Distinguished. In general, the absorbent sheet is thinner and less rigid than the fiber stack of the absorbent material. Therefore, the absorbent article provided with the absorbent sheet is thin and thin, and is flexible and comfortable to wear. It is excellent, and it can be folded compactly for excellent handling. From the viewpoint of more effectively utilizing the features of such an absorbent sheet and obtaining an absorbent article having sufficient liquid diffusivity and liquid retention and a good fit, under no load per absorbent sheet. The thickness is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, still more preferably 1.5 mm or less. As the absorbent sheet, for example, those described in Japanese Patent No. 2963647 and Japanese Patent No. 2955223 can be used. To exemplify a preferable absorbent sheet, the adhesive force generated in the highly absorbent polymer in a wet state and the adhesive force generated in the wet state and the binder such as an adhesive or the adhesive fiber added separately may be used to obtain the high absorbent polymer between the constituent fibers or between the constituent fibers. Examples thereof include a sheet formed by joining the spaces.

As shown in FIG. 1, the central absorbent sheet 41 is formed in the lateral direction of the napkin 1 or the absorbent body 10 at the intermediate portion M, or the intermediate portion M and the portions of the front portion F and the rear portion R each closer to the intermediate portion M. It is located in the center of Y. Further, as shown in FIG. 4, the central absorbent sheet 41 has a multi-layer structure formed by folding the sheet 41. The folding multi-layer structure of the central absorbent sheet 41 consists of two sheets in which one sheet 41 having a substantially rectangular shape in a plan view extends in the vertical direction X through a position that divides the sheet 41 into substantially three equal parts in the horizontal direction Y. It is bent to the same surface side (skin facing surface side) along the folding line of the above to form a so-called rolled tri-folded state, and has a three-layer structure of the sheet 41.

Further, as shown in FIGS. 3 and 4, the main body absorbing sheet 42 also has a multi-layer structure formed by folding the sheet 42. In the folding multi-layer structure of the main body absorbing sheet 42, one sheet 42 having a substantially rectangular shape in a plan view is bent to the same surface side (non-skin facing surface side) by two bending lines extending in the vertical direction X. Both ends of the sheet 41 along the vertical direction X are overlapped with each other at the central portion in the horizontal direction Y, and the overlapped portions of the both end edges are the three-layer structure of the sheet 42. The portion other than the overlapped portion has a two-layer structure of the sheet 42. The folding multilayer structure of the main body absorbent sheet 42 forms the outer shape of the absorbent body 4.

As described above, the absorber 4 in the napkin 1 in the present embodiment has a configuration in which the folded structure of one central absorbent sheet 41 is included in the folded structure of one main body absorbent sheet 42. However, the central portion of the intermediate portion M in the lateral direction Y is thicker than the peripheral portion and is raised toward the skin-facing surface side due to the arrangement of the folding structure of the central absorbent sheet 41. It is preferably the middle and high part 43. On the other hand, the portion of the absorber 4 other than the middle-high portion 43 does not have the folding structure of the central absorbent sheet 41, but includes the folding structure of the main body absorbing sheet 42, and is thicker than the middle-high portion 43. It is preferably a small standard absorber 44.

In the napkin 1 of the present embodiment, as shown in FIG. 1, the middle and high portions 43 have a rectangular shape in a plan view, the longitudinal direction thereof coincides with the vertical direction X, and the central portion of the intermediate portion M in the horizontal direction Y. It is arranged in. However, the plan view shape of the middle and high portion 43 can be arbitrarily selected and is not limited to the rectangular shape.

As shown in FIG. 1, one central folding line CFL formed by folding the napkin 1 is formed on the rear portion R of the napkin 1 of the present embodiment. The central folding line CFL is formed by folding the napkin 1 in the vertical direction X with the front surface sheet 2 forming the skin facing surface on the inside (the back surface sheet 3 forming the non-skin facing surface on the outside). , Forming a straight line extending in the lateral direction Y. The central folding line CFL may be formed in the central portion of the napkin 1 in the vertical direction X, and may be formed in the intermediate portion M instead of the rear portion R. The "central portion of the napkin 1 in the vertical direction X" as used herein means the center of the vertical direction X of the napkin 1 and its vicinity, and specifically, with reference to the center of the vertical direction X of the napkin 1. From the reference, the front side and the rear side of the vertical direction X are each within 10% of the total length of the vertical direction X of the napkin 1.

Further, in the rear portion R of the napkin 1 of the present embodiment, one rear folding line RFL formed by folding the napkin 1 is formed behind the rear slit region RS described later in the vertical direction X. Like the central folding line CFL, the rear folding line RFL is also formed by folding the napkin 1 in the vertical direction X with the surface sheet 2 forming the skin facing surface inside, and forming a straight line extending in the horizontal direction Y. I'm doing it. The rear folding line RFL extends laterally Y between the groove 6 and the inner groove 7. Both the central folding line CFL and the rear folding line RFL are used when the napkin 1 is folded and individually wrapped. The rear folding line RFL is usually formed at a position separated from the rear end of the vertical direction X of the napkin 1 to the front side of the vertical direction X by 10 to 30% of the total length of the vertical direction X of the napkin 1. In the napkin 1 of the present embodiment, the rear folding line RFL and the constricted portion 53 do not overlap. With such a configuration, there is an effect that the transmission of wrinkles can be suppressed starting from the rear folding line RFL.

In the napkin 1 of the present embodiment, as shown in FIG. 1, the absorber 4 has a plurality of slits in the intermediate portion M. Hereinafter, the slit in the intermediate portion M is also referred to as a central slit M1. It has a central slit region MS in which a plurality of central slits M1 extending in the vertical direction X are dispersedly arranged. The central slit region MS resides in the middle and high portion 43.
In the napkin 1, the central slit M1 has a linear shape in a plan view, but the plan view shape of the center slit M1 is not limited to this and may be a wavy line or the like. Further, the central slit M1 may extend in the vertical direction X and may not be parallel to the vertical center line CL as shown in the figure. When the central slit M1 is not parallel to the vertical center line CL, the angle formed by the central slit M1 and the vertical center line CL is preferably less than 45 degrees.

The central slit region MS may have one or more central slits M1. The number of central slits M1 existing in the central slit region MS is not particularly limited. Further, when the central slit region MS has a plurality of central slits M1, the plurality of central slits M1 may have the same one or both of the plan view shape and the inclination angle with respect to the vertical center line CL, and are different. You may be.

It is preferable to set the dimensions and the like of each part of the central slit M1 as follows.
The length of the central slit M1 in the vertical direction X is preferably 10 mm or more, more preferably 15 mm, and preferably 35 mm or less, still more preferably 25 mm or less. The length or width of the central slit M1 in the lateral direction Y is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.0 mm or less, further preferably 0.8 mm or less.

The central slit M1 may or may not penetrate the laminated body of the absorbent sheets constituting the absorber 4. Further, the central slit M1 is not formed on the front surface sheet 2 and the back surface sheet 3 arranged above and below the absorber 4, and is a non-woven fabric that may be arranged between the front surface sheet 2 and the absorber 4. It is preferable that it is not formed on the intermediate sheet made of.

Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit of the present invention. For example, in the above-described embodiment, the absorber is composed of only the absorbent sheet, but may be composed of only the laminated fiber made by stacking the absorbent material, and is composed of both of them. You may. Further, the multilayer structure of the absorbent sheets in the absorber may be formed by folding one absorbent sheet as in the above embodiment, or the plurality of absorbent sheets may be laminated without folding. It may be a configuration in which both configurations are combined.

The present invention can be applied to all articles used for absorption of menstrual blood. Examples of such articles include, but are not limited to, panty liners and the like, in addition to sanitary napkins as in the embodiment.

1 Sanitary napkin (absorbent article)
2 Front sheet 3 Back sheet 4 Absorber 41 Central absorbent sheet 42 Main body absorbent sheet 43 Middle and high part 44 Standard absorbent 5 Side sheet 51 Joint 51a Convex 52 Anti-slip 53 Constriction 6 Groove 61 Convex 7 Inner groove 10 Absorbent body 10H Rear flap part F Front part M Middle part R Rear part CFL Central folding line RFL Rear folding line M1 Central slit MS Central slit area R1 Rear slit RS Rear slit area CL Vertical center line X Vertical direction Y Horizontal direction

Claims (3)

It has a vertical direction along the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction, and also has a front sheet, a back sheet, and an absorber arranged between these two sheets, and is arranged near the back of the wearer. It is an absorbent article having a rear flap portion on each side of the rear portion.
The rear portion has a plurality of slits cut in the thickness direction of the absorber and separated from each other in the lateral direction, and has a slip prevention portion on the non-skin facing surface side of the rear flap portion.
The position of the slip prevention portion in the vertical direction overlaps with the slit.
The rear flap portion has a pair of recesses forming a constricted portion at both side edges of the rear flap portion along the vertical direction.
Wherein the constricted portion in the longitudinal direction is formed in the rear than the displacement preventing section,
The front surface sheet has a groove on the skin-facing surface side, in which the front surface sheet and the absorber are recessed toward the back surface sheet side.
The groove has a convex portion in the rear portion that forms a convex curve toward the outside in the lateral direction in a plan view, and the inside of the concave portion forming the top portion of the convex portion and the constricted portion. An absorbent article having a vertical distance of 5.0 mm or less from the end. 1. The distance from the rear end portion of the slip prevention portion to the constricted portion in the vertical direction is 25 to 75% with respect to the distance from the rear end portion to the rear end portion of the absorbent article. Absorbent article described in. The absorbent article has a pair of side sheets on both sides of the surface sheet facing the skin in the vertical direction.
The side sheet and the surface sheet are joined along the vertical direction by a continuous wavy joint in which outwardly facing convex portions and inwardly facing convex portions are alternately repeated.
The absorbent article according to claim 1 or 2 , wherein the constricted portion overlaps with an outwardly projecting convex portion of the joint portion at a position in the vertical direction.

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