JP6641559B2 - Absorbent articles - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an absorbent article provided with a squeezed groove and having an improved diffusibility of bodily fluid in a longitudinal direction.

  In general, an absorbent article is composed of a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber disposed between the topsheet and the backsheet. And the like are absorbed by the absorber through the topsheet. Here, conventionally, in an absorbent article, embossing from the top sheet to the absorber is widely performed in order to improve the absorbability of bodily fluids. In addition, in light incontinence pads, sanitary napkins, etc., it is also common to provide embossed grooves (pressed grooves, fit embossed) on both longitudinal edges of the absorbent article for the purpose of improving the fit when worn. In some cases, irregularities are provided on the bottom and side walls of the compressed groove to promote the diffusion of excreted bodily fluids.

  As an absorbent article provided with a squeezing groove in order to improve the fit during wearing, for example, Patent Document 1 has at least a top sheet, a back sheet, and an absorber, and absorbs on the body contact side surface. An absorbent article is disclosed in which squeezing grooves are arranged on both longitudinal side edges of a central region of a body, and a plurality of dot-shaped squeezing portions are arranged at intervals. Further, in Patent Document 2, a top sheet, a back sheet, and an absorbent body are provided, and the space is narrowed at a central portion while extending in a longitudinal direction on both sides of a body contact side surface of a region where the absorbent body is located. A sanitary napkin is disclosed in which a pair of squeezing grooves are formed, and the squeezing grooves include a high-pressure squeezed portion and a low-squeezed portion that are mutually parallel in the longitudinal direction.

  In the absorbent articles of Patent Documents 1 and 2, the bodily fluid excreted in the central portion in the width direction spreads in the width direction, reaches the compressed groove, and then diffuses in the front-rear direction along the compressed groove. .

JP 2010-148708 A JP-A-09-108262

  However, in any of the absorbent articles of Patent Documents 1 and 2, the amount of movement of the body fluid held in the compressed groove tends to decrease as the body fluid is diffused in the front-rear direction, and the body fluid held in the compressed groove is absorbed by the compressed groove. There was a possibility of lateral leakage without reaching both ends in the longitudinal direction of the sexual article. Therefore, the present invention has been made in view of the above-described problems, and has an squeezing groove, which is capable of sufficiently diffusing excreted bodily fluid to both ends in the longitudinal direction of the absorbent article. The purpose is to provide goods.

  In view of the above problems, the inventors of the present invention have conducted intensive studies. As a result, in an absorbent article having a top sheet, a back sheet, and an absorber, and having compressed grooves extending from a front portion to a rear portion through a crotch portion on both sides of a width direction center line, a compressed groove is provided. By adjusting the basis weight of the absorber adjacent to the compressed groove and finding that the above problem can be solved, the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet. It is an absorbent article having a front part, a crotch part and a rear part, wherein the absorbent article has a compressed groove extending from the front part to the rear part through the crotch part on both sides of the center line in the width direction. In the area adjacent to the compressed groove and the compressed groove, the absorber is not present, or the basis weight of the absorbent body in the area adjacent to the compressed groove and the compressed groove is smaller than the surrounding area. An absorbent article , wherein the depth of the front and rear compression grooves is greater than the depth of the crotch compression grooves .

  (2) A second aspect of the present invention is the absorbent article according to (1), wherein the bodily fluid discharge section in the crotch section has a bulkiness in which the basis weight of the absorbent body is higher than the surrounding area. It has a part.

(3) The third aspect of the present invention is the absorbent article according to (2), wherein the basis weight of the compressed groove and the absorbent at a portion adjacent to the compressed groove is 0 g / m ² or more. 420 g / ^{m 2} or less, the basis weight of the absorbent body of the body fluid discharge portion, characterized in that at 210g / ^{m 2} or more 1820 g / ^{m 2} or less.

  (Delete)

( 4 ) The fourth aspect of the present invention is the absorbent article according to any one of (1) to ( 3 ), wherein the width of the compressed grooves of the front part and the rear part is less than that of the crotch part. It is characterized in that it is narrower than the groove width of the compressed groove.

  The absorbent article of the present invention has compressed grooves on both sides of the center line in the width direction, and the compressed groove and the region adjacent to the compressed groove do not have an absorber or the basis of the absorber at these regions. The amount is lower than the surroundings, whereby the amount of the absorber at the bottom of the compressed groove is reduced, and the absorbent is more hydrophobic than the surroundings. Thereby, while the bodily fluid excreted in the bodily fluid discharge part of the absorbent article reaches the compressed groove firstly and quickly, the bodily fluid which has reached the compressed groove secondarily and the hydrophobicity of the compressed groove Due to its nature, it is not absorbed by the squeeze groove itself and diffuses quickly into the front and rear squeeze grooves. For this reason, the excreted bodily fluid is easily diffused throughout the absorbent body including both ends in the longitudinal direction of the absorbent article, and lateral leakage of bodily fluid is effectively prevented.

  Furthermore, in a preferred embodiment of the present invention, the width of the compressed groove at the crotch portion is relatively wide and shallow, and the width of the compressed groove at the front and rear portions is relatively narrow and deep, so that the compressed The height of the wave of the bodily fluid transmitted to the front part and the rear part is increased, together with the structure in which the amount of the absorber at the bottom of the groove is reduced and the hydrophobicity of the compressed groove is increased. The contact area is increased and is quickly absorbed by the surrounding absorber.

It is the top view which looked at the absorbent article of the present invention from the top sheet side. It illustrates a _X 1 -X ₁ cross section in FIG. It is a figure which shows the mode of deformation | transformation at the time of wear in the (a) crotch part and (b) front part and back part of the absorbent article of this invention. It is a figure which shows the image of a mode that a bodily fluid is absorbed in (A) a crotch part and (B) a front part and a back part.

  Hereinafter, the absorbent article 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. In the description of the present embodiment, the same elements are denoted by the same reference numerals throughout. In the following description in the present specification, the body fluid refers to a liquid such as urine, blood, or water in loose stool that is discharged from the body to the outside of the body. Furthermore, the time of wearing the absorbent article 1 refers to at least one of the time of wearing the absorbent article 1 and the time after wearing. In the description of the present specification, the longitudinal direction of the absorbent article 1 is a direction extending across the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the drawing. Further, the width direction of the absorbent article 1 is a direction that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the figure. Furthermore, in this specification, the body contact side surface of the absorbent article 1 refers to a surface that comes into contact with the wearer's skin when the absorbent article 1 is worn, and the clothing contact side surface refers to the wear of the absorbent article 1 Sometimes refers to the surface that abuts the wearer's clothing. In this specification, the body contact side surface side of the absorbent article 1 may be referred to as an upper side, and the clothing contact side surface side may be referred to as a lower side.

<Absorptive article>
Figure 1 is a plan view of the absorbent article 1 viewed from the top sheet 10 side of the present invention, FIG. 2 is a diagram illustrating the X ₁ -X ₁ cross section in FIG. As the absorbent article 1 according to the embodiment of the present invention, a light incontinence pad as shown in FIG. 1 is exemplified, but the present invention is not limited to this, and a light incontinence liner, sanitary napkin, etc. Absorbent article. The absorbent article 1 includes a liquid-permeable top sheet 10 disposed on the body contact side surface, a liquid impermeable back sheet 30 opposed to the top sheet 10 and disposed on the clothing contact side surface, and a top sheet. And the absorber 20 disposed between the top sheet 10 and the back sheet 30, whereby the absorber 20 has a structure sandwiched between the top sheet 10 and the back sheet 30. The absorbent article 1 has a front part 1a located on the front side of the wearer, a crotch part 1b located on the crotch of the wearer, and a rear part 1c located on the back side of the wearer. A groove 21 is formed.

[Top sheet]
The top sheet 10 allows body fluids to pass quickly toward the absorber 20, and is disposed to face the back sheet 30 with the absorber 20 interposed therebetween. Since the topsheet 10 is a sheet that comes into contact with the skin, it has a soft feel and does not irritate the skin, for example, a nonwoven fabric such as a thermal bond nonwoven fabric represented by an air-through nonwoven fabric, or a thermal bond / span. It is formed from a material such as a composite nonwoven fabric having laminated bonds, an open film such as an open polyethylene film, a foamed film such as polyethylene foam or urethane foam, or a composite sheet having these laminated. The top sheet 10 may have a single layer or a plurality of layers, and may have a large number of through-holes for imparting dry touch properties.

As the nonwoven fabric, synthetic fibers such as polyethylene and polypropylene, regenerated fibers such as rayon, and natural fibers such as cotton were used, and in addition to the thermal bond method, were obtained by known processing methods such as a spunlace method and a spunbond method. Those can also be used. From the viewpoint of processability and strength, the basis weight of the top sheet 10 is preferably 18 g / m ² or more and 40 g / m ² or less. A lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a humectant, or the like may be applied to the topsheet 10 in order to reduce irritation to the skin. The top sheet 10 may have an hourglass shape having a constricted portion at the center in the longitudinal direction where the wearer's crotch portion is positioned, a shape such as a substantially rectangular shape, and slightly outside the side edge of the absorber 20. It may be provided extending.

In the present invention, a liquid diffusible sheet may be provided between the top sheet 10 and the absorber 20 in order to promote the diffusion of the bodily fluid to the upper surface of the absorber 20. Examples of such a liquid-diffusing sheet include non-woven fabrics such as air-through non-woven fabric, point-bonded non-woven fabric, spun-bonded non-woven fabric, and melt-blown non-woven fabric; it can. The thickness of the liquid diffusible sheet is preferably 0.1 mm or more, and the basis weight is preferably 15 g / m ² or more. The shape of the liquid-diffusing sheet is not particularly limited, but is preferably a shape that can completely cover the surface of the absorber 20 so that liquid such as urine can be diffused throughout the absorber 20.

[Back sheet]
The back sheet 30 is made of a liquid-impermeable and water-blocking sheet material so that body fluid does not leak to the outside of the absorbent article 1. However, even if the back sheet 30 has moisture permeability to prevent stuffiness Good. As a material of the back sheet 30 having such characteristics, for example, a plastic sheet having a small thickness such as a polyethylene sheet or a polyethylene laminated nonwoven fabric can be exemplified. The back sheet 30 may have a shape such as an hourglass shape or a substantially rectangular shape having a constricted portion at the longitudinal center where the crotch portion of the wearer is positioned, and extend slightly outward from the side edge of the absorber 20. May be provided. An adhesive layer 60 for fixing the absorbent article 1 to underwear or the like at the time of wearing may be provided on the clothing contact side surface of the back sheet 30. When the absorbent article 1 has the adhesive layer 60, the absorbent article 1 may have a release sheet 65 for protecting the adhesive layer 60, and the release sheet 65 is integrated with the packaging sheet of the absorbent article 1. May be. Even if the top sheet 10 and the back sheet 30 form a flap that is fixed by a hot-melt adhesive or a heat seal without sandwiching the absorber 20, at least at a part of the end, such as the end in the longitudinal direction. Good.

[Absorber]
The absorber 20 contains absorbent fibers as a base material and a superabsorbent polymer (hereinafter, also referred to as SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic paper And non-woven fabrics. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include wood pulp, synthetic fiber, polymer fiber, non-wood pulp, and the like that are defibrated into cotton.

  The superabsorbent polymer of the absorbent body 20 is not particularly limited as long as it can absorb bodily fluids and prevent backflow, and can be sodium polyacrylate, polyaspartate, (starch-acrylic acid) graft. Copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers, and those formed from materials such as saponified products thereof can be used. Among these, sodium polyacrylate is preferred from the viewpoint of the amount of absorption per weight.

  In the absorbent body 20, the form of the absorbent fiber and the SAP is preferably a form of a laminated mat formed by mixing SAP particles in the absorbent fiber. Further, for the purpose of preventing leakage of the SAP particles and stabilizing the shape of the absorber 20, it is preferable to wrap the absorber 20 in a carrier sheet. The substrate of the carrier sheet may be any material having hydrophilicity, and examples thereof include hydrophilic nonwoven fabrics such as tissues, absorbent paper, and air-laid nonwoven fabrics. When a plurality of carrier sheets are provided, the base materials of the carrier sheets may be the same or different.

  The absorber 20 may be formed by laminating an upper absorber and a lower absorber. In this case, the size of the upper absorber and the lower absorber in the longitudinal direction and the width direction may be such that the size of the upper absorber is larger than the size of the lower absorber, and the size of the upper absorber is the same as the size of the lower absorber. And the size of the upper absorber may be smaller than the size of the lower absorber.

(Low rice area and bulky area)
As shown in FIG. 1 and FIG. 2, in the absorbent article 1 of the present invention, whether or not the absorbent 20 is present in a compressed groove 21 and a region adjacent to the compressed groove 21 described later, , A low rice basin portion 22 in which the grammage is lower than the surrounding area is formed. By forming the low U.S. floor area 22 in the compressed groove 21 and the portion adjacent to the compressed groove 21 of the absorbent article 1, the height of the compressed groove 21 and the absorber 20 in the portion adjacent to the compressed groove 21 is reduced. Since it becomes lower than the surroundings and the amount of the absorber 20 present at the bottom of the compressed groove 21 is also reduced, the hydrophobicity of the compressed groove 21 is improved. Thereby, as shown in FIG. 4A, the bodily fluid excreted in the bodily fluid discharge part of the absorbent article 1 quickly reaches the compressed groove 21, and the bodily fluid that has reached the compressed groove 21 is compressed by the compressed groove 21. Due to the hydrophobicity of the bottom part, it quickly diffuses into the compressed grooves 21 of the front part 1a and the rear part 1c. For this reason, the excreted bodily fluid is easily diffused to the entire area of the absorbent body 20 including both ends in the longitudinal direction of the absorbent article 1, and lateral leakage of bodily fluid can be effectively prevented. Further, in the absorbent article 1 of the present invention, it is preferable that the bodily fluid discharge portion has the bulky portion 23 in which the basis weight of the absorber 20 is higher than the surroundings. Since the absorbent article 1 has the bulky portion 23, the excreted bodily fluid quickly reaches the front, rear, left and right compressed grooves 21, so that the bodily fluid is easily diffused to the front part 1a and the rear part 1c.

In the absorbent article 1 according to the present invention, the basis weight of the absorbent body 20 at a portion other than the low rice basin part 22 and the bulky part 23 varies depending on the absorption amount of the absorbent article 1, but the absorbent fiber and the superabsorbent polymer based on the weight of the sum of the weight of, it is preferably 200 g / ^{m 2} or more 1400 g / ^{m 2} or less, more preferably 400 g / ^{m 2} or more 1300 g / ^{m 2} or less. By setting the basis weight of the absorber 20 within the above range, it is possible to maintain both the absorption performance and the wearing feeling of the absorbent article 1 satisfactorily.

On the other hand, in the low rice basin portion 22 including the compressed groove 21, the basis weight of the absorbent body 20 is 0% or more and 30% or more as compared with the basis weight of the absorbent body in a portion except the low rice basin portion 22 and the bulky portion 23. % Or less, and more preferably 0% or more and 20% or less. Specifically, the basis weight of the absorbent body 20 in the low U.S. tsubo part 22 is 0 g / m ² or more and 420 g / m ² or less based on the total weight of the absorbent fibers and the superabsorbent polymer. And more preferably 0 g / m ² or more and 280 g / m ² or less. By adjusting the basis weight of the low U.S. tsubo part 22 as described above, the body fluid discharged to the body fluid discharge part can be quickly diffused onto the absorber 20 while maintaining the absorption performance of the absorber 20 good. Can be. In the bulky portion 23, it is preferable that the basis weight of the absorber 20 is increased by 5% or more and 30% or less as compared with the basis weight of the absorbent body 20 excluding the low rice basis portion 22 and the bulky portion 23, More preferably, the surcharge is increased by 10% or more and 30% or less. Specifically, the basis weight of the absorbent body 20 in the bulk portion 23, based on the weight of the sum of the weight of absorbent fibers and superabsorbent polymer, is preferably 210g / m ² or more 1820 g / m ² or less , and more preferably 220 g / ^{m 2} or more 1820 g / ^{m 2} or less. By adjusting the basis weight of the bulky portion 23 as described above, it is possible to quickly diffuse the bodily fluid discharged to the bodily fluid discharge portion onto the absorber 20 while maintaining a good wearing feeling of the absorbent article 1. it can.

  The method for forming the low-medium tsubo part 22 and the bulky part 23 is not particularly limited. For example, the low-mean tsubo part 22 is adjacent to the compressed groove 21 and the compressed groove 21 when the absorbent body 20 is formed. It can be formed by molding so as not to dispose more absorbers 20 at the site. On the other hand, the bulky part 23 divides the absorbent body 20 into an upper absorbent body 201 constituting the bulky part 23 and a lower absorbent body 202 constituting another part as shown in FIG. It may be formed by laminating the lower absorber 202. Contrary to FIG. 2, the bulky portion 23 may be formed by using a wide absorber as the upper absorber 201 and a narrow absorber as the lower absorber 202.

[Press groove]
The absorbent article 1 of the present invention has a compression groove 21 extending from the front part 1a to the rear part 1c through the crotch part 1b on both sides of the center line in the width direction along the longitudinal direction. In other words, the absorbent article 1 of the present invention has the compressed grooves 21 on both sides of the width direction center line in the front portion 1a, the crotch portion 1b, and the rear portion 1c, respectively. , And the compressed groove 21 of the front part 1a and the rear part 1c. As shown in FIG. 1, in the present invention, the compressed grooves 21 are preferably provided symmetrically about the center line in the width direction of the absorbent article 1, and the left and right compressed grooves in the front part 1 a and the rear part 1 c. It is preferable that 21 is connected at both ends in the longitudinal direction of the absorbent article 1 so as to draw an arc. In addition, although the compressed groove 21 is provided so as to avoid the center in the width direction of the crotch portion 1b, by adopting such a configuration, the skin contact in the vicinity of the body fluid discharge portion of the absorbent article 1 is improved. can do.

  Here, in the present invention, in order to promote the movement of bodily fluids, it is preferable that the depth of the compressed groove 21 of the front part 1a and the rear part 1c is deeper than the depth of the compressed groove 21 of the crotch part 1b. . By making the depth of the compressed groove 21 of the front part 1a, the crotch part 1b, and the rear part 1c such a configuration, the groove width of the compressed groove 21 in the front part 1a, the crotch part 1b, and the rear part 1c is adjusted. Combined with the configuration, the contact area between the body fluid that has reached the compressed groove 21 of the front part 1a and the rear part 1c and the side wall of the compressed groove 21 increases, and is quickly absorbed by the surrounding absorber. It becomes easier to diffuse the compressed groove 21 at a higher speed, and the body fluid on the absorbent article 1 can be sufficiently diffused to both ends in the longitudinal direction. Therefore, the bodily fluid on the absorbent article 1 is absorbed by the entire surface of the absorber 20, so that the bodily fluid is quickly absorbed and the lateral leakage of the bodily fluid is further prevented.

  As described above, the absorbent article 1 of the present invention has the low rice basin portion 22 adjacent to the compressed groove 21, and preferably has the bulky portion 23 in the body fluid discharge portion. As shown in FIG. 3, when the absorbent article 1 is worn, the pair of compressed grooves 21 are formed as valleys in the crotch portion 1 b by having the low rice tsubos 22 and the bulky portions 23 as shown in FIG. 3. It becomes easy to deform into a W shape. While the absorbent article 1 is deformed in this way when worn, the fit of the absorbent article 1 is improved, and the bodily fluid discharged to the bodily fluid discharge portion is easily retained by the compressed groove 21. In the front part 1a and the rear part 1c, since the absorbent article 1 is less deformed when worn, there is a concern that the easiness of holding the body fluid in the compressed groove 21 may be reduced as compared with the crotch part 1b. In the preferred embodiment of the present invention, as described above, the depth of the compressed groove 21 of the front part 1a and the rear part 1c is set to be deeper than the depth of the compressed groove 21 of the crotch part 1b. The bodily fluid is easily held in the compressed groove 21, and the bodily fluid can be absorbed in the entire region of the absorber 20 including the absorber 20 in the front part 1a and the rear part 1c.

  Here, the depth of the compressed groove 21 in the absorbent article 1 of the present invention is preferably 30% or more and 90% or less, and more preferably 40% or more with respect to the thickness of the absorber 20 in the crotch portion 1b. % Is more preferable. Further, the depth of the compressed groove 21 at the front part 1a and the rear part 1c is preferably 40% or more and 95% or less, and more preferably 50% or more and 90% or less with respect to the thickness of the absorber 20. More preferred. By setting the depth of the compressed groove 21 within the above range, while maintaining the absorption performance of the absorber 20 satisfactorily, particularly at the front part 1a and the rear part 1c, the bottom and peripheral absorbers of the compressed groove 21 Since the density of the body fluid 20 is high, the excreted body fluid can be quickly diffused to both ends in the longitudinal direction. The thickness of the absorber 20 varies depending on the absorption performance of the absorbent article 1, but the depth of the compressed groove 21 is set at the crotch 1 b within a range that satisfies the above condition in relation to the thickness of the absorber 20. It is preferably 0.5 mm or more and 5 mm or less, and more preferably 0.7 mm or more and 7 mm or less in the front part 1a and the rear part 1c.

  In addition, in the absorbent article 1 of the present invention, it is preferable that the groove width of the compressed groove 21 of the front part 1a and the rear part 1c is smaller than the groove width of the compressed groove 21 of the crotch part 1b. By adopting a configuration in which the groove width of the compressed groove 21 is reduced from the crotch portion 1b to the front portion 1a or the rear portion 1c, as shown in FIGS. 4B and 4A, the body fluid transmitted to the front portion 1a and the rear portion 1c is formed. The height of the wave increases, and the wave moves quickly in the front-rear direction, and at the same time, the contact area with the side wall of the compressed groove 21 increases, so that the body fluid is quickly absorbed by the nearby absorber 20. On the other hand, in FIGS. 4B and 4B, the width of the compressed groove 21 is constant, but the height of the wave of the bodily fluid transmitted to the front part 1a and the rear part 1c is not maintained high, so that FIG. B) Compared with (a), the speed at which the bodily fluid moves in the front-rear direction decreases. In addition, the groove width of the compressed groove 21 in the crotch portion 1b is preferably 2 mm or more and 12 mm or less, more preferably 3 mm or more and 6 mm or less. Further, the groove width of the compressed groove 21 is preferably 1 mm or more and 6 mm or less, preferably 1 mm or more and 3 mm or less in the front part 1 a and the rear part 1 c in order to increase the contact area between the body fluid and the absorber 20. Is more preferable. By setting the groove width of the compressed groove 21 within the above range, in addition to the above-mentioned effects, the feeling of wearing and the fit of the absorbent article 1 to the wearer can be maintained well, and the excreted bodily fluid is excreted. Can be securely held by the compressed grooves 21 and can be quickly diffused to both ends in the longitudinal direction.

  In the above description, the mode in which the groove width and the depth of the compressed groove 21 are separately adjusted in the front part 1a and the rear part 1c and the crotch part 1b has been described. The front portion 1a, the rear portion 1c, and the crotch portion 1b do not need to be constant. The width and depth of the compressed groove 21 are gradually changed from the crotch portion 1b to the front portion 1a and the rear portion 1c. The width of the compressed groove 21 of the crotch portion 1b gradually decreases from near the center in the longitudinal direction toward the front portion 1a and the rear portion 1c, and the depth of the compressed groove 21 of the crotch portion 1b is reduced in the longitudinal direction. A configuration in which the depth gradually increases from near the center to the front part 1a and the rear part 1c may be adopted.

  In the present invention, as shown in FIG. 1, at the connection point of the compressed groove 21 of the front portion 1a and the compressed groove 21 of the crotch portion 1b, and at the connection point of the compressed groove 21 of the rear portion 1c and the compressed groove 21 of the crotch portion 1b. Preferably, the compressed groove 21 of the front part 1a and the compressed groove 21 of the rear part 1c are branched. Thereby, the body fluid held in the compressed groove 21 can be diffused more widely on the surface of the absorber 20 in the front part 1a and the rear part 1c of the absorbent article 1. Here, when the compressed grooves 21 are arranged symmetrically with respect to the center line in the width direction of the absorbent article 1, two pairs of compressed grooves 21 branched at the front part 1 a and the rear part 1 c are formed at both ends in the longitudinal direction. They may be connected to each other, and may have a configuration in which the pressing groove 21 draws a double arc in the front part 1a and the rear part 1c.

[Small pattern at the bottom of compressed groove]
In the present invention, a micro-pattern made of a superabsorbent polymer is provided at the bottom of the compressed groove 21, and after the compressed groove 21 comes into contact with the bodily fluid, the bodily fluid that reaches both ends in the longitudinal direction flows back to the central portion in the longitudinal direction. May be prevented. As such a fine pattern at the bottom of the compressed groove 21, over the entire width of the compressed groove 21, the amount of the superabsorbent polymer at the end near the center in the longitudinal direction is smaller, and at the end near the both ends in the longitudinal direction. Mention may be made of a plurality of serrated micropatterns in which the amount of superabsorbent polymer is higher. By forming such a fine pattern, after the bottom of the compressed groove 21 comes into contact with the bodily fluid, the fine pattern that has absorbed and swollen the bodily fluid serves as a weir for blocking backflow of the bodily fluid. It is possible to prevent the backflow of the bodily fluid without obstructing the flow of the bodily fluid from the center portion toward both ends in the longitudinal direction.

  Such a fine pattern is formed by, for example, forming a concave portion corresponding to the fine pattern on a convex portion of an emboss roll corresponding to the bottom of the compressed groove 21 when forming the compressed groove 21 by embossing. It is preferable to use a band-shaped absorbent sheet orthogonal to 21 to form a fine pattern. The absorbent sheet may use SAP.

[Three-dimensional gather]
A three-dimensional gather 50 may be provided on the body contact side surface of the absorbent article 1. The three-dimensional gathers 50 form a confined space for bodily fluids together with the top sheet 10 so that lateral leakage of bodily fluids can be prevented. The three-dimensional gather 50 preferably includes a three-dimensional gather sheet 51 and a stretchable elastic member 52 disposed along a free end of the three-dimensional gather sheet 51. As the elastic elastic member 52, a thread-shaped, string-shaped, or flat-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be used as appropriate.

<Method for producing absorbent article>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be employed. For example, if necessary, the liquid diffusible sheet and the three-dimensional gathers 50 are arranged on the top sheet 10 in advance, and the absorber 20 is sandwiched between the top sheet 10 and the back sheet 30. Then, while forming the compressed groove 21 extending from the top sheet 10 to the absorber 20, the top sheet 10 and the back sheet 30 are partially or entirely surrounded by a hot melt adhesive, heat emboss, ultrasonic emboss, high frequency emboss. It can be manufactured by fixing using such as. Finally, after individually wrapping this in a package, it may be folded in three in the longitudinal direction.

  As described above, the present invention has been described using the embodiment. However, needless to say, the technical scope of the present invention is not limited to the scope of the invention described in the above embodiment, and various changes or improvements may be made to the above embodiment. It is clear to a person skilled in the art that it is possible to add It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Absorbent article 1a Front part 1b Crotch part 1c Rear part 10 Top sheet 20 Absorber 201 Upper layer absorber 202 Lower layer absorber 21 Compressed groove 22 Low rice basin part 23 Bulk part 30 Back sheet 50 Solid gather 51 Solid gather sheet 52 Elasticity Elastic member 60 Adhesive layer 65 Release sheet

Claims (4)

Absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet, and having a front portion, a crotch portion, and a rear portion. And
The absorbent article, on both sides of the width direction center line, has a compressed groove that passes from the front part to the rear part through the crotch part,
In the area adjacent to the compressed groove and the compressed groove, the absorber is not present, or the basis weight of the absorbent body in the area adjacent to the compressed groove and the compressed groove is lower than the surrounding area. and,
An absorbent article , wherein the depth of the front and rear compression grooves is greater than the depth of the crotch compression grooves .   2. The absorbent article according to claim 1, wherein the body fluid discharge portion in the crotch portion has a bulky portion in which the basis weight of the absorber is higher than the surroundings. 3. The basis weight of the absorbent body in the compressed groove and a portion adjacent to the compressed groove is 0 g / m ² or more and 420 g / m ² or less, and the basis weight of the absorbent body in the body fluid discharge unit is 210 g / m ^2. above 1820g is / ^{m 2} or less, the absorbent article according to claim 2. The absorbent article according to any one of claims 1 to 3 , wherein the width of the compressed grooves of the front part and the rear part is smaller than the width of the compressed grooves of the crotch part.

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