JP6944297B2 - Sanitary napkin for daytime - Google Patents

Description

The present invention relates to a daytime sanitary napkin .

Conventionally, in absorbent articles such as sanitary napkins, panty liners, and incontinence pads, the length and width in the posterior region of the absorbent article to prevent fluid from leaking from behind and / or diagonally posterior to the absorbent article. It is known to have an extended part with a larger size.

As an absorbent article provided with such an expansion portion, for example, Patent Document 1 describes an article in which a hip-hold flap HF is formed on the rear side of the absorbent article. According to Patent Document 1, the hip-hold flap HF is formed inside the virtual line drawn from the rear base of the wing-shaped flap at an angle of 9 degrees to the outside with respect to the longitudinal direction line. It describes that the flaps for hip hold can be prevented from turning over or twisting.

Further, Patent Document 2 describes a hip flap portion HF formed behind the central region. In this absorbent article, the hip flap portion HF is located behind the first constriction, the first flap including the portion having the maximum width, and the front of the first constriction. A second flap portion is provided, and a side adhesive portion is arranged on the first flap portion. Patent Document 2 describes that such a configuration can prevent the hip flap portion HF from twisting and improve the fixed state.

JP-A-2010-227211 Japanese Unexamined Patent Publication No. 2014-36832

By the way, when the absorbent article is attached, at least a part of the rear region provided with the expansion portion can be deformed according to the shape of the groove of the buttocks (buttocks). At that time, if the absorbent article is not properly fitted to the body in a state of being deformed along the groove of the buttocks, the body fluid is likely to leak in the posterior region. Therefore, in an absorbent article having an extended portion, the fit when the rear region is deformed along the groove of the buttocks is also important.

However, in Patent Documents 1 and 2, the fit when the rear region of the absorbent article is deformed along the groove of the buttocks is not particularly studied.

In view of the above points, one embodiment of the present invention fits the body well when the absorbent article is deformed along the groove of the buttocks in the absorbent article having an extended portion at the rear, thereby. An object of the present invention is to provide an absorbent article having an enhanced function of preventing leakage of body fluid in the posterior region.

A first embodiment of the present invention includes an absorption body including a liquid-permeable front surface sheet, a liquid-impermeable back surface sheet, and an absorber provided between the front surface sheet and the back surface sheet. It is a sex article and has a central region including a region corresponding to a body fluid discharge port of the wearer at the time of wearing and a rear region behind the central region, and the rear region is the most rearmost region of the rear region at its front end. It has a small width, the outer shape of the rear end of the rear region has an uneven shape, and the distance in the front-rear direction between the center of the region corresponding to the body fluid discharge port and the position of the maximum width of the rear region. Is 85 to 130 mm, and the maximum width is 115 to 135% of the minimum width.

According to the first aspect, since the outer shape of the rear end portion of the rear region of the absorbent article has a concavo-convex shape, the plurality of convex portions included in the concavo-convex shape are relatively independent of each other. You can move freely. Therefore, the region at the rear end of the absorbent article can be deformed according to the roundness of the buttocks. In addition, when worn, the rear region can be deformed according to the shape of the body to fit the body without causing large wrinkles.

Further, the distance in the front-rear direction between the center of the region corresponding to the body fluid discharge port and the position of the maximum width of the rear region has a predetermined value. That is, in the absorbent article of this embodiment, the position of the maximum width of the rear region is relatively forward. With such a configuration, at the time of mounting, the position of the maximum width of the rear region can be made to correspond to the portion where the groove of the buttocks is deep or the vicinity thereof. Therefore, even when the main body is deformed so as to fit into the groove of the buttocks, the width of the absorbent article can be provided with a margin, and leakage from the side can be prevented.

If the posterior region does not have a sufficient width in the region corresponding to the buttock groove, the width of the region becomes smaller by the amount of entering the groove, and body fluid may leak from the side, and the buttock region If the width of the region corresponding to the groove is too large, wrinkles may occur, and leakage or discomfort may occur along the wrinkles. On the other hand, in the present embodiment, the relationship between the size of the maximum width and the size of the minimum width of the rear region is defined in a predetermined range. Therefore, when the vicinity of the center of the main body is raised and deformed so as to enter the groove of the buttocks, the width of the rear region after the deformation can be made substantially equal from the front to the rear. As a result, leakage from the side can be satisfactorily prevented.

In the second aspect of the present invention, the minimum width is 30 to 38% with respect to the total length of the absorbent article, and the maximum width is 40 to 45% with respect to the total length of the absorbent article. ..

According to the second aspect, the minimum width and the maximum width in the rear region are defined in a predetermined range with respect to the total length. Thereby, the absorbent article can have an appropriate maximum width and maximum width with respect to the total length according to the purpose of use, and the above-mentioned effect of preventing leakage from the side can be improved.

In the third aspect, the concave-convex shape includes at least two recesses on one side of the anteroposterior centerline.

According to the third aspect of the present invention, the uneven shape of the outer shape of the rear end portion of the rear region includes at least two recesses on one side of the center line in the front-rear direction. This makes it possible to further improve the effect of the above-mentioned uneven shape, that is, the effect that the rear region can be deformed according to the shape of the body without causing large wrinkles.

In the fourth aspect of the present invention, a pair of squeezing grooves having a line-symmetrical center line in the anteroposterior direction are formed in the rear region, and the pair of squeezing grooves are obliquely posterior from the center line in the anteroposterior direction. It has a pair of extending obliquely posterior extending portions, and the rearward portion is located at a position where an extension line of the center line of the pair of obliquely posterior extending portions or the pair of oblique posterior extending portions intersects. The deformation base point, which is the base point for deforming the region, is formed 45 to 70 mm behind the center of the region corresponding to the body fluid discharge port, and the obliquely posterior extending portion has the deformation base point and the uneven shape. It extends along a virtual line passing through the bottom point of the foremost recess.

According to the fourth aspect, a pair of squeezing grooves is formed in the rear region, and a deformation base point is formed at a predetermined position where the pair of squeezing grooves or an extension line of the center line thereof intersect. With such a configuration, the main body is easily bent from the deformation base point along the extending portion in the posterior oblique direction, so that the region between the squeezing grooves is raised and a good fit can be made along the groove of the buttocks.

Further, the oblique posterior extension portion of the squeezing groove extends along a virtual line passing through the deformation base point and the bottom point of the foremost concave portion of the concave-convex shape in the rear region, so that the posterior extension portion is oblique from the deformation base point. The main body becomes easier to bend along the extending direction. This makes it possible to further improve the fit of the posterior region along the buttock groove.

In the fifth aspect of the present invention, the angle between the virtual line and the center line in the front-rear direction is 30 to 40 °.

According to the fifth aspect, since the angle between the virtual line and the center line in the front-rear direction is set within a predetermined range, the rear region can be satisfactorily formed even when the groove of the buttocks is widened when the wearer sits down. Can be fitted.

According to one embodiment of the invention, in an absorbent article with a posterior dilation, the absorbent article fits well to the body when deformed along the buttock groove, thereby causing fluid in the posterior region. It is possible to provide an absorbent article having an enhanced function of preventing leakage.

It is a partial fracture view of the absorbent article by one embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line I-I of an absorbent article according to an embodiment of the present invention. It is a figure for demonstrating the outer shape of the absorbent article by one embodiment of this invention. It is an enlarged view of the rear region of FIG. It is a figure which shows the deformation example of a pair of squeezing grooves. It is a schematic diagram which shows the state at the time of mounting of the absorbent article by one embodiment of this invention.

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

FIG. 1 shows a partially broken view of the absorbent article 1 according to one embodiment of the present invention. Further, FIG. 2 shows a cross section taken along line I-I of FIG. As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-impermeable back sheet 2, a liquid-permeable front sheet 3, and an absorber 4 provided between the two sheets 2 and 3. It is provided with a main body (absorbent article main body) 8 to have. In order to maintain the shape of the absorber 4, the absorber 4 may be wrapped with an encapsulating sheet 5 made of crepe paper, a non-woven fabric, or the like.

As shown in FIG. 1, the main body 8 has an elongated shape having a predetermined length in the front-rear direction and a predetermined width in a direction orthogonal to the front-rear direction as a whole. The width of the main body 8 is substantially constant in the illustrated example, but may vary in the front-rear direction. The absorbent article 1 can have a shape substantially line-symmetrical with respect to the center line (center line in the front-rear direction or the center line in the longitudinal direction) CL extending in the front-rear direction.

Further, the absorbent article main body 8 has a region (area corresponding to the body fluid discharge port) 50 corresponding to the body fluid discharge port such as the vaginal opening of the wearer when worn, and the body fluid discharge port corresponding area 50 has a center 50A. doing. The center 50A is located on the center line CL in the anteroposterior direction, and is located at the center of the length in the anteroposterior direction of the region 50 corresponding to the body fluid discharge port. The absorbent article 1 has a central region M including a body fluid discharge port corresponding region 50, a front region F in front of the central region M, and a rear region R behind the central region M. The central region M may have wings W, W extending from both sides thereof to securely fix the absorbent article 1 to the underwear when it is attached. The front region F can be a region from a position that is the starting point in front of the wing W to the front end edge, and a rear region R can be a region from a position that is the starting point behind the wing W to the rear end edge. When the wings W and W are provided, the center 50A (also referred to as the body fluid discharge port corresponding portion) of the body fluid discharge port corresponding region 50 is a lateral edge portion of the wing W and W when viewed in the front-rear direction. It can be located at the midpoint of the anterior-posterior length of the wing W, or at an intermediate position between the front and rear ends of the wings W, W.

In the examples of FIGS. 1 and 2, the absorbent article 1 has wings W and W, but the absorbent article 1 can be in a form without wings W and W. In that case, when the wings W and W are formed at the positions where the wings W and W are conventionally formed, the area in front of the starting point of the wings W and W is set as the front area F and the area behind the wings W and W is set as the front area F. The region rearward from the position serving as the starting point of the above can be defined as the rear region R.

The posterior region R has a first posterior region R1 adjacent to the anterior region and a second posterior region R2 from the posterior end of the first posterior region R1 to the posterior edge of the absorbent article 1. The first posterior region R1 is a region that can correspond to a place where the groove of the buttocks of the wearer is deep at the time of wearing, and also faces the position where the anus and the intergluteal cleft start. When worn, the first posterior region R1 is deformed so that the central portion in the width direction rises toward the body so as to enter the groove of the buttocks. Further, the second posterior region R2 is a region that is curved forward and reaches a position above the gluteal sulcus of the buttocks when worn, and can be said to be a hip lower portion corresponding region corresponding to the hip lower portion 70 of the body 60 (FIG. 6). ). The rear end of the first rear region R1 (the front end of the second rear region R2) may be located 85 mm or more rearward from the center 50A of the body fluid discharge port corresponding region 50.

The length of the rear region R in the front-rear direction can be 70 to 140 mm, the length of the first rear region R1 in the front-rear direction can be 45 to 80 mm, and the length of the second rear region R2 in the front-rear direction. The length of the can be 35 to 70 mm.

A flap-shaped portion that does not include the absorber 4 may be formed on the peripheral edge of the main body 8. For example, at the front and rear edge edges of the main body 8, the back surface sheet 2 and the front surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal or ultrasonic seal to form a front flap. A portion 9a and a rear flap-like portion 9b may be formed. Further, side non-woven fabrics 7 are provided on both sides of the surface sheet 3 side along the front-rear direction (longitudinal direction), respectively. At the lateral edge of the absorber 4, the side non-woven fabrics 7 and 7 and the back surface sheet 2 are joined by an adhesive such as hot melt or an adhesive means such as heat seal or ultrasonic seal to be sideways. A flap-shaped portion may be formed. The lateral flap portion is formed on the side of the wings W, W, and the rear region R that partially protrude from both sides of the main body 8 (formed on the rear side of the absorbent article 1). The square flap-shaped portion 9c can be included.

As the back sheet 2, a sheet material having at least water impermeability, such as an olefin resin sheet such as polyethylene or polypropylene, can be used. It is possible to use a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a laminated non-woven fabric sheet in which a waterproof film is interposed to ensure substantially impermeable liquid. Further, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability. Such a water-impervious / moisture-permeable sheet material is 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 the uniaxial or biaxial direction. A porous sheet can be used.

The surface sheet 3 is a liquid-permeable sheet that rapidly permeates body fluids such as menstrual blood, vaginal discharge, and urine. As the surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. As the material fibers constituting the non-woven fabric, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, blended fibers thereof, and natural fibers such as cotton can be used alone or. Two or more types can be used in combination. Examples of the non-woven fabric processing method include a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method. Of these processing methods, the spunlace method is preferable in that it can produce a flexible non-woven fabric and the spunbond method is preferable in that it can produce a drapeable non-woven fabric, and the thermal bond method is preferable in that it can produce a bulky and soft non-woven fabric. 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 be used.

The absorber 4 interposed between the back surface sheet 2 and the front surface sheet 3 is not limited as long as it is a material capable of absorbing and retaining body fluid, but preferably contains cotton-like pulp and a water-absorbent polymer. As the water-absorbent polymer, a superabsorbent polymer (SAP), a superabsorbent polymer fiber (SAF), or a combination thereof can be used. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. As a raw material for chemical pulp, softwood, softwood and the like are used, but softwood is preferably used because of its long fiber length and the like.

Further, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used, and two of these can be mixed. It can also be used. 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. It is also possible to use a hydrophobic fiber whose surface is treated with a hydrophilic agent to give it an affinity for body fluids.

The thickness of the absorber 4 can be in the range of 0.5 to 25 mm, preferably in the range of 1.5 to 6.5 mm. The absorber 4 does not have to have a uniform thickness over the front surface, and may have a structure in which the body fluid discharge port corresponding region 50 and the region in the vicinity thereof, and the central portion in the width direction of the rear region are bulged. Further, the absorber 4 is preferably manufactured by a stacking fiber or an airlaid method.

As the side non-woven fabric 7, a water-repellent treated non-woven fabric or a hydrophilic treated non-woven fabric can be used. For example, in the case of enhancing the effect of preventing menstrual blood or vaginal discharge from penetrating or enhancing the feeling of touch, it is preferable to use a water-repellent treated non-woven fabric coated with a silicone-based, paraffin-based, alkylchromic chloride-based water repellent or the like. .. Further, in the case of enhancing the absorbability of menstrual blood and the like in the wings W and W, it is preferable to use a hydrophilically treated non-woven fabric as the material of the non-woven fabric. As the type of non-woven fabric, a soft air-through non-woven fabric that does not easily crease and wrinkle is preferable.

On the outer edges of the wings W and W, squeezing portions (embossing) having a dot shape or a predetermined shape are provided at predetermined positions for the purpose of joining the side non-woven fabric 7 and the back surface sheet 2 and increasing the rigidity. You may.

The total length of the absorbent article 1 is preferably 21 to 28 cm, more preferably 23 to 27 cm, and even more preferably 24 to 26 cm.

As shown in FIGS. 1 and 3, the outer shape of the rear end portion of the rear region R of the absorbent article 1 has a concave-convex shape, that is, has a shape including two or more convex portions and concave portions. There is. The outer line of this uneven shape is preferably a wave shape including a smooth curve as shown in the illustrated example. In the illustrated example, the second rear region R2 has an uneven shape.

As described above, when the second rear region R2 has a concavo-convex shape, the plurality of convex portions included in the concavo-convex shape can move relatively freely without affecting each other. As a result, the peripheral edge of the second rear region R2 can be flexibly deformed according to the roundness of the body.

Further, when the absorbent article 1 is attached, both side portions of the central region M are bent downward by receiving forces from both legs, and the central portion in the width direction of the first rear region R1 is raised so as to enter the groove of the buttocks. do. Further, the second rear region R2 is deformed so as to be curved toward the body in the forward direction. Due to such deformation, the rear lateral flap-shaped portion 9c and the rear flap-shaped portion 9b of the rear region R are pulled forward and easily stretched along the peripheral edge of the main body 8, and thus include the flap-shaped portions 9b and 9c. Wrinkles and twists are likely to occur in the rear region R. However, since the rear region R can be flexibly deformed by forming irregularities on the outer shape of the rear end of the rear region R as described above, the rear region R can be adjusted to the shape of the body without causing large wrinkles. Can be fitted.

The outer shape of the second rear end region R, that is, the outer shape extending from the rear of the rear lateral flap-shaped portion 9c to the rear flap-shaped portion 9b, has its apex at the position _{of the maximum width w 2 in the rear region R, as shown in FIG.} A first convex portion 31 having a first convex portion 31, a first concave portion 41 adjacent to the rear of the first convex portion 31, a second convex portion 32 adjacent to the rear of the first concave portion 41, and a second concave portion 42 adjacent to the rear thereof. May have. Further, the uneven shape of the end portion of the rear region R may have a third convex portion 33 having an apex on the center line CL in the front-rear direction.

In the illustrated example, two concave portions are formed on one side separated by the center line CL in the front-rear direction, but the number of concave portions and convex portions is not limited to the illustrated example. For example, the outer shape of the rear end of the rear region R may have 3 to 7 convex portions and 2 to 6 concave portions with respect to the entire rear end. By forming four or more recesses with respect to the entire rear end, that is, by forming two or more recesses on one side of the center line in the front-rear direction, the rear region R can be adjusted to the shape of the body. It can be flexibly deformed.

The width of the first rear region R1 is gradually increasing. The outer shape of the first rear region R1 may be linear or curved as shown in FIGS. 1 and 3. When it is curved, it may be a shape that bulges outward in the width direction or may be a shape that is recessed inward in the width direction. Since the first rear region R1 is in a position where it is likely to receive the force from both legs when it is attached, it is likely to be twisted or turned over. Therefore, as shown in the drawing, the form in which the outer shape of the first rear region R1 is not uneven is preferable from the viewpoint of preventing twisting and turning.

When the widths are compared excluding the region at the rear end of the rear region R, as shown in FIG. 3, the rear region R has the minimum width w ₁ of the rear region R at its front end. _{This minimum width w 1} can be said to be the minimum width of the first rear region R1. Further, the rear region R has a _{maximum width w 2} behind the position of the _{minimum width w 1} . The position of the maximum width w ₂ is included in the second rear region R2.

When the center of the body fluid discharge port corresponding area 50 is 50A, _{the distance d 1 in} the front-rear direction between the _{center 50A and the position of the maximum width w 2} can be 85 to 130 mm, and 90 to 120 mm. It is preferably 95 to 115 mm, more preferably 100 to 110 mm. By _{setting d 1} to 85 mm or more, _{it is possible to prevent the maximum width w 2} from approaching the legs and causing wrinkles or twists or causing discomfort. Further, by _{setting d 1} to 130 mm or less, _{the position of the maximum width w 2} is set to a portion having a deep groove in the buttocks or its vicinity, that is, a vicinity of the first posterior region R1, which is relatively close to the wearer's anus when worn. It can be made to correspond. As a result, even when the main body 8 in the first rear region R1 is deformed so as to penetrate deeply into the groove of the buttocks, the width of the rear region R of the absorbent article 1 can be provided with a margin, and leakage from the side can be provided. Can be prevented.

Further, the ratio value (d ₁ / w _{1 ) of the distance d 1 in} the front-rear direction between the _{center 50A and the position of the maximum width w 2 to} the minimum width w ₁ can be 1 to 1.6. It is preferably 1.1 to 1.5. By _{setting d 1} / w ₁ to the above range, _{the position of the maximum width w 2} can be arranged relatively forward. With such a configuration, _{the position of the maximum width w 2} can be made to correspond to the portion where the groove of the buttocks of the wearer is deep or the vicinity thereof at the time of wearing.

Further, the maximum width w ₂ can be 115 to 135% with respect to the minimum width w ₁ , preferably 118 to 133%, and more preferably 120 to 130%. By setting the relationship between the maximum width w ₂ and the minimum width w ₁ to the above range, the vicinity of the center of the rear region R in the width direction, particularly the vicinity of the center of the first rear region R1 in the width direction is raised so as to enter the groove of the buttocks. The width of the rear region R after deformation can be made substantially equal from the front to the rear even when the rear region R is deformed. Thereby, leakage from the side can be satisfactorily prevented.

Normally, when the main body 8 of the rear region R is deformed along the groove of the buttocks, the width of the rear region R after deformation is reduced by the amount of entering the groove. Therefore, if the maximum width w ₂ is not sufficient, body fluid may leak from the side. In the present embodiment, by _{setting the maximum width w 2} to 115% or more of the minimum width w ₁ , the rear region R has a sufficient width in the region corresponding to the groove of the buttocks, so that the width direction of the rear region R Even if the central part rises and enters the groove of the buttocks, it is possible to prevent the leakage of body fluid from the side. Further, when the maximum width w ₂ is excessively large, unnecessary wrinkles may occur, but such wrinkles can be prevented by _{setting the maximum width w 2} to 135% or less of the minimum width w _1. .. As a result, it is possible to prevent the body fluid from leaking along the wrinkles, and it is also possible to eliminate the discomfort.

Further, the maximum width w ₂ is set to 118 to 133% with respect to the minimum width w ₁ , preferably 120 to 130%, so that the rear region R is set to the wearer when the rear region R is worn as standard (normally worn). Can be fitted better to the body.

The width after the deformation means the width when the absorbent article 1 is viewed from above or viewed in a plan view when actually mounted. Therefore, according to this embodiment, at the time of mounting, the width _{of the position of the minimum width w 1} and the width of the position of the maximum width w ₂ can be substantially the same when viewed from above.

The difference (w _2- w ₁ ) between the maximum width w ₂ and the minimum width w ₁ is preferably 15 to 25 mm, more preferably 17 to 23 mm. By setting the above range, the width after deformation at the time of mounting can be made substantially the same at _{the position of the minimum width w 1 and} the position of the maximum width w _{2 in the front-rear direction.}

Further, the distance between the position of the minimum width w _{1 and} the position of the maximum width w ₂ in the rear region R is preferably smaller than _{the minimum width w 1.} The ratio value (d ₂ / w ₁ ) of the distance d _{2 between the position of the minimum width w 1 and} the position of the maximum width w ₂ in the rear region R with respect to the minimum width w ₁ is 0.55 to 0.98. It is preferable, and it is more preferable that it is 0.65 to 0.9. By setting the above range, _{the position of the maximum width w 2} can be made to correspond to the portion where the groove of the buttocks is deep or its vicinity. Therefore, even if the main body is deformed so as to enter the groove of the buttocks. Leakage from the side can be prevented.

The minimum width w ₁ is preferably 30 to 38% with respect to the total length L (FIG. 3) of the absorbent article 1. Further, the maximum width w ₂ is preferably 40 to 45% with respect to the total length of the absorbent article 1. _{In this way, by setting the minimum width w 1} and the maximum width w ₂ in the rear region R to the above ranges with respect to the total length, the absorbent article 1 has an appropriate maximum width w for the total length according to the purpose of use. It can have ₁ and a maximum width w _2. Thereby, in the rear region R, the effect of preventing leakage from the side can be improved.

The value (d _{1 / L) of the ratio of the distance d 1 in} the front-rear direction between the center 50A and _{the position of the maximum width w 2 to} the total length L is preferably 0.35 to 0.46, and is preferably 0. It is more preferably 38 to 0.43. The ratio value (d ₂ / L) of the distance d _{2 between the position of the minimum width w 1 and} the position of the maximum width w ₂ in the rear region R with respect to the minimum width w ₁ is 0.2 to 0.3. It is preferably 0.22 to 0.28, more preferably 0.22 to 0.28.

The main body 8 of the absorbent article 1 may be formed with a squeezing groove (also referred to as a compression groove or embossing) that is recessed from the front surface sheet 3 side to the back surface sheet 2 side. The squeezing groove can be formed by passing a laminated body in which the surface sheet 3 is laminated on the absorbent body 4 between a pair of pressure rolls. For example, the laminated body can be passed so that a convex roll and a flat roll are arranged on the surface sheet 3 side and the absorber 4 side, respectively.

As shown in FIGS. 1 and 4, a pair of squeezing grooves (rear squeezing grooves) 15 and 15 having a line symmetry of the center line CL in the anteroposterior direction are formed in the rear region R as squeezing grooves. The pair of posterior squeezing grooves 15 and 15 have oblique posterior extending portions 15A and 15A extending in the oblique posterior direction from the anteroposterior center line CL. The pair of posterior squeezing grooves 15 and 15 may be formed over the first posterior region R1 and the second posterior region R2, but the oblique posterior extending portions 15A and 15A are related to the deformation of the main body 8 as described later. Therefore, it is preferable that it is formed in the first rear region R1.

When the absorbent article 1 is attached, the main body 8 can be easily bent in the posterior oblique direction along the extending portions 15A and 15A in the posterior oblique direction. As a result, the region between the oblique posterior extending portions 15A and 15A, and thus the region between the posterior squeezing grooves 15 and 15, can be raised toward the body.

As a whole, the oblique posterior extending portions 15A and 15A may extend in a straight line as long as they follow the folding line extending in the oblique posterior direction when bent at the time of mounting as described above. , At least a part may be curved. When the oblique posterior extending portions 15A and 15A are curved, the shape may bulge outward in the width direction or may be recessed inward in the width direction. Further, the oblique posterior extending portions 15A and 15A may have a shape that combines a shape that bulges outward in the width direction and a shape that dents inward in the width direction, that is, the radius of curvature, as shown in the illustrated example. It may have a shape having two or more, or having an inflection point.

The length of the entire rearward pressing grooves 15 and 15 in the front-rear direction can be about 40 to 60 mm. Further, the lengths of the oblique posterior extending portions 15A and 15A in the front-rear direction can be about 25 to 40 mm.

As shown in FIG. 4, a deformation base point 20 is formed at a position where the extension lines of the center lines of the pair of posterior extension portions 15A and 15A included in the pair of posterior squeezing grooves 15 and 15 intersect. .. The deformation base point 20 can be a base point for deforming the rear region R. The deformation base point 20 is formed in the first rear region R1 and can correspond to the start position of the intergluteal cleft at the time of mounting.

As described above, since the main body 8 is easily bent along the oblique posterior extending portions 15A and 15A extending in the oblique posterior direction with the deformation base point 20 as the base point, the absorbent article 1 is attached. Occasionally, the area of the pair of posterior squeezing grooves 15, 15 can be easily raised towards the body. Thereby, the rear region R can be deformed corresponding to the place where the groove of the buttocks is deep. When the deformation base point 20 is on the center line CL in the front-rear direction, the right and left sides of the main body 8 can be deformed in a well-balanced manner, which is preferable.

The deformation base point 20 is preferably located 45 to 70 mm behind the center 50A of the body fluid discharge port corresponding region 50, more preferably 50 to 65 mm behind, and 55 to 65 mm behind. More preferred. By setting the position of the deformation base point 20 in the above range, the pair of rear squeezing grooves 15 and 15 accurately correspond to the grooves in the buttocks, so that the rear region R can be satisfactorily adhered to the grooves at the time of mounting, and the body fluid can be brought into close contact with the grooves. The function of preventing leakage can be improved.

The extending directions of the oblique posterior extending portions 15A and 15A are preferably related to the position of the concave-convex concave portion at the rear end of the posterior region R. Specifically, as shown in FIG. 4, a linear virtual line passing through the deformation base point 20 and the foremost concave portion of the concave-convex shape at the end of the rear region R, that is, the bottom point P of the first concave portion 41. When X is drawn, the obliquely posterior extending portions 15A and 15A may extend along the virtual line X. The fact that the posterior oblique extending portions 15A and 15A extend along the virtual line X means that the posterior oblique extending portions 15A and 15A are on or in contact with the virtual line X.

In this way, the extending directions of the oblique posterior extending portions 15A and 15A correspond to the bottom point P of the first recess 41, so that the rear region R is in the oblique posterior direction when the absorbent article 1 is attached. It becomes easy to bend along the extending portions 15A and 15A. As a result, the rear region R, particularly the first rear region R1, can be easily deformed according to the shape of the groove in the buttocks. Therefore, the above-mentioned effect of making the width of the rear region R after deformation at the time of mounting substantially equal from the front to the rear can be obtained more reliably.

The radius of curvature of the first convex portion 31 is preferably larger than the radius of curvature of the second convex portion 32, and the radius of curvature of the first concave portion 41 is equal to or higher than the radius of curvature of the second concave portion 42. Is also preferably small. Further, the radius of curvature of the first concave portion 41 is preferably smaller than the radius of curvature of the first convex portion 31. Further, the radius of curvature of the first concave portion 41 is preferably equal to or smaller than the radius of curvature of the second convex portion 32. When the radius of curvature of the first recess 41 is smaller than the radius of curvature of the convex portions on both sides, the rear region R can be bent more easily with the base point of the first recess 41 as the base point. Thereby, the effect that the main body 8 can be brought into close contact with the deep position of the groove of the buttocks can be further improved by the above-described configuration in which the oblique posterior extending portions 15A, 15A and the first recess 41 correspond to each other. ..

The radius of curvature of the first convex portion 31 can be 15 to 30 mm, preferably 20 to 30 mm. The radius of curvature of the second convex portion 32 can be 10 to 27 mm, preferably 17 to 27 mm. The radius of curvature of the third convex portion 33 can be 10 to 25 mm, preferably 10 to 20 mm. The radius of curvature of the first recess 41 can be 7 to 17 mm, and the radius of curvature of the second recess 42 can be 10 to 30 mm, preferably 20 to 30 mm.

As shown in FIG. 4, the imaginary line X has a predetermined angle α with respect to the front-back direction center line CL, and the angle α is preferably 30 to 40 °. By setting the angle α to the above range, it is possible to prevent the region between the pair of posterior squeezing grooves 15 and 15 from biting into the buttock groove too much or not sufficiently reaching the deep part of the buttock groove. Can be done. Further, by setting the angle α to the above range, even if the groove of the buttocks becomes large when sitting on a chair or the like at the time of wearing, the area between the rear pressing grooves 15 and 15 can be fitted well to the groove of the buttocks. Can be done. Further, by setting the angle α in the above range, the main body 8 can be easily deformed along the groove of the buttocks. Therefore, the width of the rear region R at the time of mounting after deformation is made substantially equal from the front to the rear. The effect can be further enhanced.

The pair of posterior squeezing grooves 15 and 15 are separated from each other in the examples of FIGS. The shape of the above in a plan view is not limited to that of FIGS. 1 and 4.

FIG. 5 shows another example of a squeeze groove formed in the posterior region R. FIG. 5A shows an example in which the front surfaces of the pair of posterior squeezing grooves 15 and 15 shown in FIGS. 1 and 4 are connected. In this case, the deformation base point 20 is a point where the posterior oblique extending portions 15A and 15A included in the pair of rearward pressing grooves 15 and 15, respectively, intersect. In this way, when the pair of rearward squeezing grooves 15 and 15 are connected in the front and the rearward oblique extending portions 15A and 15A are connected by this, the rigidity of the deformation base point 20 is increased, so that the rearward oblique extending is extended. The main body 8 can be further easily bent along the portions 15A and 15A. This makes it possible to improve the fit corresponding to the groove in the buttocks.

Further, as shown in FIG. 5C, the pair of rear squeezing grooves 15 and 15 may have a shape that is not substantially heart-shaped and is connected at the rear end. Further, as shown in FIGS. 5 (b) and 5 (d), the pair of rearward squeezing grooves 15 and 15 may be composed of the posterior oblique extending portions 15A and 15A, respectively. In that case, the rigidity between the pair of rear squeezing grooves 15 and 15 can be lowered, which is preferable from the viewpoint of improving the touch.

As described above, according to the absorbent article 1 of the present embodiment, it is possible to effectively prevent the leakage of the body fluid in the rear region R, particularly the leakage of the body fluid from the side. Therefore, the absorbent article 1 of this embodiment can be suitably used as a sanitary napkin having a total length of 21 to 28 cm for daytime use, particularly when sitting for a long time.

1 Absorbent article 2 Back sheet 3 Front sheet 4 Absorbent 5 Encapsulated sheet 7 Side non-woven fabric 8 Main body (absorbent article main body)
9a, 9b, 9c Flap-shaped part 11 Front squeezing groove 13 Central squeezing groove 15 Rear squeezing groove 15A Oblique posterior extension part 20 Deformation base points 31, 32, 33 Convex parts 41, 42 Concave parts 50 Body fluid discharge port Corresponding area 50A Body fluid drainage Center of exit corresponding area 60 Body 70 Lower hip CL Front-back direction Center line F Front area M Central area R Rear area R1 First rear area R2 Second rear area P First recess bottom point X Virtual line W Wing

Claims (5)

And liquid-permeable topsheet, a liquid-impervious backsheet, said to have the absorber and which is provided between the top sheet and the backsheet, a body having a substantially constant width, said body A daytime sanitary napkin with a flap-like portion at the periphery .
It has a central region including a region corresponding to the body fluid discharge port of the wearer at the time of wearing, and a rear region behind the central region.
The rear region has the minimum width of the rear region at its front end.
The outer shape of the rear end of the rear region has a wave shape,
The distance in the front-rear direction between the center of the region corresponding to the body fluid discharge port and the position of the maximum width of the rear region is 85 to 130 mm.
The maximum width is 115-135% of the minimum width.
The maximum width is 40 to 45% of the total length of the daytime sanitary napkin . The minimum width is 30 to 38% relative to the total length of the daytime sanitary napkin, daytime sanitary napkin of claim 1. The daytime sanitary napkin according to claim 1 or 2, wherein the wavy shape includes at least two recesses on one side of the anterior-posterior centerline. A pair of squeezing grooves having a line-symmetrical center line in the anteroposterior direction are formed in the rear region, and the pair of squeezing grooves extend in the oblique posterior direction from the center line in the anteroposterior direction. Has a part,
The deformation base point, which is the base point for deforming the rear region, corresponds to the body fluid discharge port at the position where the extension line of the center line of the pair of oblique posterior extending portions or the pair of oblique posterior extending portions intersects. It is formed 45 to 70 mm behind the center of the area to be formed.
Any one of claims 1 to 3, wherein the oblique posterior extending portion extends along a virtual line passing through the deformation base point and the bottom point of the foremost concave portion of the wave shape. The daytime sanitary napkin described in. The daytime sanitary napkin according to claim 4, wherein the angle between the virtual line and the center line in the anteroposterior direction is 30 to 40 °.

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