JP2019166231A - Absorbent article - Google Patents

Abstract

To provide an absorbent article comprising preferable air permeability and having sufficient absorption capacity.SOLUTION: An absorber comprises laminated first layer and second layer, the first layer comprises a first opening extending in a cross direction, the second layer comprises a second opening extending in a cross direction. The first and second layers are laminated to have a part where the first and second openings are laminated in plan view, the first opening comprises at least, a wide width part formed on a front part and a narrow width part which is on a rear side of the wide width part and adjacent to the wide width part, the second opening has a width smaller than a width of the first opening in a range where the wide width part is formed, and has a width larger than a width of the first opening in a range where the narrow width part is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  As an absorbent article having an absorbent body, a sanitary napkin is known in addition to disposable diapers in the form of pad type, tape type, pants type and the like. In such an absorbent article, there is an absorbent article in which an opening or a groove is formed in order to easily induce body fluid in the front-rear direction.

  For example, Patent Document 1 discloses an absorbent article having an absorbent laminate including an upper absorbent layer and a lower absorbent layer, the upper absorbent layer having an upper opening extending in the front-rear direction, and the lower absorbent layer Has a lower opening that overlaps with the upper opening and extends in the front-rear direction.

Japanese Patent No. 6211747

  However, in the configuration described in Patent Document 1, when the leg pressure is applied to both sides of the absorbent article, the opening may be crushed over the whole. For this reason, air permeability is impaired, and stuffiness is likely to occur. On the other hand, when the width of the opening is increased in consideration of the prevention of stuffiness, there is a case where the absorption capacity of the absorber cannot be secured sufficiently.

  In view of the above points, an object is to provide an absorbent article having good air permeability and sufficient absorption capacity.

  A first aspect of the present invention is an absorbent article having an absorber, having a predetermined length in the front-rear direction, and a predetermined width in the width direction orthogonal to the front-rear direction, The first layer and the second layer are stacked, the first layer includes a first opening extending in the front-rear direction, and the second layer includes a second opening extending in the front-rear direction. The first layer and the second layer are stacked so as to have a portion where the first opening and the second opening overlap in a plan view, and the first opening is at least in front A wide portion formed in the rear portion and a narrow portion formed adjacent to the wide portion rearward, and the second opening portion includes the first opening portion within a range in which the wide portion is formed. And having a width larger than the width of the first opening in the range where the narrow portion is formed.

  According to the first aspect, the absorber has the first layer and the second layer. For this reason, different absorber layers can be provided with different functions. In addition, the first layer and the second layer respectively include a first opening and a second opening extending in the front-rear direction, and the first opening and the second opening have a portion that overlaps in plan view. This overlapped portion becomes a penetrating portion that penetrates the entire absorber in the thickness direction. For this reason, the air permeability of the absorbent body can be improved, and even if the absorbent article is worn for a long time even after the body fluid is discharged, the stuffiness can be prevented well.

  In addition, when the absorbent article is attached (with the absorbent article attached), if pressure from the legs (leg pressure) is applied to both sides of the absorbent body, even if there is a penetrating part as described above, That is, it closes in the width direction and air permeability may be impaired. On the other hand, in this aspect, the first opening has at least a wide portion formed at the front and a narrow portion formed adjacent to the rear thereof, and the second opening has a wide portion. In the formed range, the width is smaller than the width of the first opening, and in the range where the narrow portion is formed, the width is larger than the width of the first opening. In this configuration, when leg pressure is applied, both edges of the first opening first come into contact with each other and close inward in the width direction in the range where the narrow portion is formed. Here, even if the leg pressure is applied, both edges of the first opening that first contacted become so-called refill bars (stoppers). In particular, in the range where the wide portion that is not easily affected by the leg pressure is formed, both edges of the penetrating portion are difficult to approach each other, that is, difficult to close in the width direction. Therefore, even when a strong leg pressure is applied to the absorbent article from the side, the penetrating portion can be partially maintained.

  Also, in the range from the front end to the rear end of the portion where the first opening and the second opening overlap, either one of the first opening and the second opening is connected to the other edge. It protrudes inward in the width direction beyond each. Thereby, the absorption capacity of the absorber can be secured, and leakage of body fluid to the outside in the width direction (so-called lateral leakage) can be reduced.

  In the second aspect of the present invention, the wide portion is disposed at or near the body fluid discharge port corresponding portion corresponding to the body fluid discharge port of the wearer at the time of wearing.

  According to said 2nd aspect, the wide part is arrange | positioned in the bodily fluid discharge outlet corresponding | compatible part or its vicinity. As described above, since the penetrating portion can be maintained in the range where the wide portion is formed, the discharged body fluid can be immediately received by the penetrating portion. Therefore, even when a large amount of body fluid is discharged at once, it is difficult for side leakage.

  In the third aspect, the first opening has a second wide portion adjacent to the rear of the narrow portion.

  According to the third aspect of the present invention, since the first opening has a wide portion at the rear, the body fluid can be received even if a large amount of body fluid reaches the rear end of the first opening. Lateral leakage can be prevented.

  In the fourth aspect of the present invention, the plan view shape of the second opening has a curved outline that swells at the center in the front-rear direction.

  According to the fourth aspect, the contour of the plan view shape of the second opening is a curved shape that swells in the center, so that it is possible to guide the body fluid that travels along the edge of the opening without any delay.

  In the fifth aspect of the present invention, the first layer is provided on the skin facing surface side, and the second layer is provided on the opposite side of the skin facing surface.

  According to the fifth aspect, the first opening having a wide portion in front is positioned on the skin facing surface side (upper side), and the second opening is positioned on the opposite side (lower side) of the skin facing surface. become. Therefore, the area of the wide opening for receiving body fluid can be increased. Thereby, the effect which prevents a side leak can be heightened.

  In addition, when the wide portion of the first opening is viewed from above, both edges of the second opening provided in the lower layer (second layer) protrude inward in the width direction. Therefore, in front of the opening, part of the body fluid can be quickly drawn into the lower layer (second layer) absorber from both edges of the protruding second opening. In addition, a part of the body fluid is guided rearward along the opening, but in the range where the narrow part of the first opening is formed, when leg pressure is applied, the upper layer of the narrow part (the first layer) A portion where the first opening of the first layer is closed and the second opening of the lower layer (second layer) is not closed is formed, and a groove-like passage through which body fluid flows is formed in the lower layer (second layer). become. Therefore, the bodily fluid that has been received in the front and has reached the lower layer (second layer) is guided rearward along a passage located away from the skin. Thereby, the quantity of the bodily fluid which touches skin can be made small, and a wearing feeling can also be improved.

  In the sixth aspect of the present invention, the second layer is provided on the skin facing surface side, and the first layer is provided on the opposite side of the skin facing surface.

  According to the sixth aspect, the second layer is provided on the skin facing surface side (upper side) and the first layer is provided on the opposite side (lower side) of the skin facing surface. When body fluid is received in front of the opening, body fluid is guided along the opening in the range where the narrow portion of the first opening is formed, but when leg pressure is applied, the lower layer (first A portion where the first opening of the layer) is closed and the second opening of the upper layer (second layer) is not closed is formed, and a groove-shaped passage through which body fluid flows is formed in the upper layer (second layer). Become. Therefore, the body fluid received in the front is promptly guided backward along the passage formed in the upper layer (second layer) while a part of the body fluid is absorbed by the lower layer (first layer) absorber. be able to.

  In the seventh aspect of the present invention, a plurality of the first openings and the second openings are provided, and each of the first openings and the second openings is a center line extending in the front-rear direction. They are spaced apart on each side.

  According to the seventh aspect, since a plurality of first openings and second openings are provided, it is possible to improve the effect of guiding body fluid in the front-rear direction by the first openings and the second openings. it can. In addition, since the first opening and the second opening are provided separately on each side of the center line extending in the front-rear direction, the absorbent article is mounted with being shifted in the width direction (left and right). Even in this case, the body fluid can be guided well in the front-rear direction.

  According to one embodiment of the present invention, it is possible to provide an absorbent article having good air permeability and sufficient absorption capacity.

It is a top view of an absorptive article by a 1st embodiment of the present invention. It is the II sectional view taken on the line of FIG. It is the top view which expanded the absorber shown in FIG. 1 partially. It is a figure which shows the state which leg pressure applied to the absorber of FIG. 3 and changed. The M1-M1 line cross section in FIG.3 and FIG.4 is shown. The E1-E1 line cross section in FIG.3 and FIG.4 is shown. It is the top view which expanded the absorber in the absorptive article by a 2nd embodiment of the present invention partially. It is a figure which shows the state which leg pressure applied to the absorber of FIG. 7 and changed. The M2-M2 line cross section in FIG.7 and FIG.8 is shown. The E2-E2 line cross section in FIG.7 and FIG.8 is shown. The modification of an opening part is shown. The modification of an opening part is shown. It is a top view of an absorptive article by a 3rd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, unless otherwise specified, the same or corresponding components may be denoted by the same reference numerals and description thereof may be omitted.

(Basic structure of absorbent article)
First, the basic structure of the absorbent article according to the embodiment of the present invention will be described. In the following description, an embodiment of the present invention will be described based on an example of a pad type disposable diaper (urine collection pad).

  In FIG. 1, the top view of the absorbent article 100 by one form of this invention is shown. FIG. 2 is a cross-sectional view taken along the line II of FIG. As shown in FIGS. 1 and 2, the absorbent article 100 includes a liquid-permeable top sheet 22, a liquid-impermeable back sheet 21, and an absorbent body 30 provided between the sheets 21 and 22. have. When the absorbent article 100 is mounted, the top sheet 22 side is the skin side (upper side), and the back sheet 21 side is the side (lower side) fixed to the outer (outer diaper), underwear, or the like.

  As shown in FIG. 1, the absorbent article 100 has a predetermined length in the first direction (front-rear direction) D1 and a second direction (width direction) D2 orthogonal to the first direction D1 in plan view. It has a predetermined width. In the form of FIG. 1, the width of the absorbent article 100 is shorter than the length. That is, the absorbent article 100 has an elongated shape as a whole. In addition, the front and back of the absorbent article 100 correspond to the abdominal side and the back side, respectively, when worn (a state in which the absorbent article 100 is worn).

  The length (full length) of the absorbent article 100 in the front-rear direction D1 can be about 350 to 700 mm, and the length (full width) in the width direction D2 can be about 130 to 400 mm. The shape of the absorbent article 100 can be line symmetric with the center line CL extending in the front-rear direction as a symmetric line, but is not necessarily line symmetric. The configuration of the absorbent article 100 (the size, shape, arrangement, etc. of each element such as the top sheet 22, the back sheet 21, and the absorber 30) may be axisymmetric, but is similar to the shape of the absorbent article 100. It does not have to be line symmetric.

  In the form of FIG. 1, the absorbent article 100 has a crotch corresponding region RC <b> 1 near the center when viewed in the front-rear direction D <b> 1. In the present specification, the “groin corresponding region” means a portion corresponding to the crotch (inseam) of the body at the time of use. The crotch corresponding region RC1 may be, for example, a range from the center in the front-rear direction of the absorbent article 100 or the vicinity thereof to a predetermined position in front, or a predetermined range in the center in the front-rear direction of the absorbent article. In the form of FIG. 1, the absorbent article 100 is formed with a constricted portion having a narrow width, but the region where the constricted portion is formed or a part thereof is a crotch corresponding region RC1. Good. Further, a region adjacent to the front of the crotch corresponding region RC1 and up to the front end of the absorbent article 100 is a front region RF1, and is adjacent to the rear of the crotch corresponding region RC1 and extends to the rear end of the absorbent article 100. Is the rear region RR1.

  In addition, the planar view shape of the absorbent article 100 does not have a portion (constricted portion) whose width is narrower than that of the front and rear regions, as described above, and is a rectangle whose width is constant in the front-rear direction D1. Other shapes such as a shape may be used.

  The length in the front-rear direction D1 of the crotch corresponding region RC1 is about 10 to 150 mm, the length of the front region RF1 in the front-rear direction D1 is about 50 to 350 mm, and the length of the rear region RR1 in the front-rear direction D1 is about 50 to 350 mm. be able to. Moreover, when the absorbent article 100 has a constricted portion, the minimum width is preferably about 50 to 90% of the entire width of the absorbent article 100 (the length in the width direction D2 before and after the constricted portion).

  The backsheet 21 can have the same shape and size as the absorbent article 100. The size of the backsheet 21 may be larger than the absorber 30. As the back sheet 21, a sheet having moisture permeability can be used in addition to a polyethylene film or the like without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. The outer surface of the back sheet 21 can be covered with an exterior sheet such as a nonwoven fabric.

  As shown in FIGS. 1 and 2, the top sheet 22 is disposed on the upper side of the absorber 30. In the illustrated form, the top sheet 22 does not cover part of the end portion of the absorbent body 30 in the width direction D2, but may cover the entire absorbent body 30. As the top sheet 22, a perforated or non-porous nonwoven fabric or a perforated plastic sheet can be used. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene and polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  As shown in FIGS. 1 and 2, an intermediate sheet 25 can be interposed between the top sheet 22 and the absorber 30. By providing the intermediate sheet 25, the body fluid absorbed by the absorber 30 can be prevented from returning. Therefore, as the intermediate sheet 25, it is preferable to use a material having low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films.

  The back sheet 21 and the top sheet 22 are bonded to both ends of the absorbent body 30 in the front-rear direction D1. Moreover, the back sheet 21 and the gather sheets 24 and 24 respectively provided along the front-rear direction D1 are bonded to both sides of the absorbent article 100 in the width direction D2. Yes.

  As the gather sheet 24, a plastic sheet, a melt-blown nonwoven fabric, and the like can be used. From the viewpoint of good touch to the skin, a nonwoven fabric that has been subjected to a water repellent treatment with silicone or the like is preferably used.

  As shown in FIGS. 1 and 2, the gather sheets 24, 24 are overlaid on the top sheet 22. And the elastic member fixed in the expansion | extension state along the front-back direction may be provided in the edge part inside the width direction D2 of each casser sheet 24. FIG. This elastic member may be manufactured from a styrene rubber, an olefin rubber, a urethane rubber, an ester rubber or the like formed in a thread shape, a string shape, a belt shape, or the like.

  Further, the gather sheet 24 may be joined to the top sheet 22, the packaging sheet 26, or the back sheet 21 disposed immediately below the shaded area in FIG. 1. And since an elastic member can be provided in the edge part inside the width direction D2 of the gather sheet | seat 24 as mentioned above, in the part (namely, area | region inside the width direction D2) where the gather sheet | seat 24 is not joined. And the area | region except the both ends can become the gathers G and G which stand on the front side (top sheet side) of the absorbent article 100. FIG. The gathers G and G can prevent the body fluid from leaking to the side.

  In addition, joining of the gather sheets 24 and 24 and the lower component can be formed by, for example, a hot melt adhesive, heat sealing, or ultrasonic sealing.

  As shown in FIG. 1, the absorbent body 30 has an elongated shape as a whole, like the absorbent article 100. The planar view shape of the absorbent body 30 has a constricted portion like the overall planar view shape of the absorbent article 100, but the width extends in the front-rear direction D1 regardless of the planar view shape of the absorbent article 100. A rectangular shape without a constricted portion that is constant may be used. In addition, when the absorber 30 has a constricted portion as illustrated, the minimum width of the constricted portion can be about 50 to 75% of the length in the width direction D2 before and after the constricted portion.

  As shown in FIG. 1, the absorbent body 30 may be wrapped by a packaging sheet 26 such as a nonwoven fabric or crepe paper. Moreover, when the absorber 30 consists of multiple layers as will be described later, each layer may be wrapped with a packaging sheet, or the packaging sheet may be sandwiched between layers. The packaging sheet 26 may be uncolored (that is, white) or may be colored. The color can be a color that can make the color of the discharged body fluid inconspicuous, for example, a color close to the color of the body fluid, or a color complementary to or close to the color of the body fluid.

  As shown in FIG. 1, the absorbent body 30 has a crotch corresponding region RC2 in the vicinity of the center when viewed in the front-rear direction D1, and the crotch corresponding region RC2 is the crotch corresponding region RC1 of the absorbent article 100 described above. It corresponds to. And the area | region to the front end of the absorber 30 adjacent to the front of the crotch corresponding area RC2 is the front area RF2, adjacent to the rear of the crotch corresponding area RC2, and the area to the rear end of the absorber 30 is the rear This is a region RR2.

  In addition, as shown in the figure, the crotch corresponding region RC2 of the absorbent body 30 that may constitute a part of the above-described constricted portion may be disposed in the front half region of the absorbent body 30, or depending on the configuration of the entire product. May be arranged at the center of the absorber 30 in the front-rear direction D1.

  Absorbent body 30 may be a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, a non-woven fabric, etc., and may be formed by mixing and adhering a superabsorbent polymer such as particles as necessary. Can be used. In order to prevent particle spillage, such as when mixing superabsorbent polymer particles, the absorbent body 30 is preferably wrapped with a packaging sheet 26.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorbent body 30 can be determined as appropriate, but the fiber basis weight is preferably about 100 to 700 g / m ^2, and the basis weight of the absorbent polymer is 50 to 550 g / m ^2. It is preferable to set the degree.

  As shown in FIG.1 and FIG.2, the absorber 30 has the laminated | stacked 1st layer 30A and 2nd layer 30B. Thus, the absorber 30 has a plurality of stacked layers, whereby each layer can have a different function. The thickness of the first layer 30A can be 0.5 to 10 mm, and the thickness of the second layer 30B can be 0.5 to 10 mm. And the thickness of the absorber 30 whole as a laminated body can be 1-20 mm.

(First embodiment)
As 1st Embodiment, the elements on larger scale of the absorber 30 of the absorbent article 100 of FIG. 1 is shown in FIG. FIG. 4 shows a state in which leg pressure P is applied to the absorber 30 of FIG. 3 from both sides. FIG. 5 shows a change of the cross section taken along line M1-M1 from the state shown in FIG. 3 to the state shown in FIG. 5A is a cross-sectional view taken along line M1-M1 in FIG. 3, and FIG. 5B is a cross-sectional view taken along line M1-M1 in FIG. FIG. 6 shows a change in the cross section taken along the line E1-E1 from the state shown in FIG. 3 to the state shown in FIG. 6A shows a cross-sectional view taken along line E1-E1 of FIG. 3, and FIG. 6B shows a cross-sectional view taken along line E1-E1 of FIG.

  As shown in FIG. 3, the first layer 30A includes a first opening 32A extending in the front-rear direction, and the second layer 30B includes a second opening 32B extending in the front-rear direction. In the present specification, the first opening 32A and the second opening 32B may be collectively referred to as an opening. In the form of FIG. 3, both the first opening 32A and the second opening 32B have a line-symmetric shape, and the center lines in the front-rear direction are each linear. However, the front-rear direction center lines of the first opening 32A and the second opening 32B may be curved over the whole or a part of the range in which the opening extends.

  In the first embodiment, since the first layer 30A is disposed on the upper side (top sheet 22 side) and the second layer 30B is disposed on the lower side (back sheet 21 side), the first opening 32A is disposed on the upper layer, The two openings 32B are located in the lower layer. The first opening 32A and the second opening 32B have a portion that overlaps in plan view (a common portion between the first opening 32A and the second opening 32B), and this overlapping portion is an absorber. A penetrating portion 35 (shown by hatching in FIG. 3) penetrates the entirety of 30. It is preferable that the penetration part 35 penetrates the whole absorber 30 in the thickness direction, preferably substantially perpendicular to the surface direction of the absorber 30. The presence of such a through portion 35 can improve the air permeability of the absorbent body, and even when the absorbent article is worn for a long time after the body fluid is discharged, it is possible to prevent stuffiness.

  It is preferable that the center line (front-rear direction center line) extending in the front-rear direction of the first opening 32A and the center line extending in the front-rear direction of the second opening 32B substantially coincide with each other at least partially. It is preferable that they substantially coincide with each other. In the present specification, the center lines substantially coincide with each other when the angle between the center lines is ± 10 °, preferably ± 5 °, or when the two center lines extend in parallel. Means that the distance between two lines is 5 mm or less, preferably 3 mm or less. Moreover, the front-rear direction center line of the first opening 32A and the front-rear direction center line of the second opening 32B may substantially coincide with the front-rear direction center line CL of the absorbent article 100.

  The lengths of the first opening 32A and the second opening 32B can be appropriately selected according to the configuration and use of the absorbent article 100. The length of the first opening 32A in the front-rear direction D1 is preferably 140 to 220 mm, and more preferably 180 to 215 mm. The length of the second opening 32B in the front-rear direction D1 is preferably 140 to 250 mm, and more preferably 150 to 235 mm.

  As shown in FIG. 3, the first opening 32 </ b> A has a wide portion W at least at the front, and has a narrow portion N adjacent to the rear of the wide portion W. The widths of the narrow portion N and the wide portion W are relative and are not limited as long as the width of the narrow portion N is smaller than the width of the wide portion W.

  As shown in FIG. 3, in the range in which the wide portion W is formed, the width of the second opening 32B is smaller than the width of the first opening 32A, and in the range in which the narrow portion N is formed, the second The width of the opening 32B is larger than the width of the first opening 32A.

  In the conventional configuration, even if there is a penetrating part that penetrates the absorbent body in the thickness direction, if the leg pressure is applied during wearing, the penetrating part may close in the width direction over the whole, and the air permeability may be impaired There is sex. On the other hand, in the configuration of the present embodiment, when the leg pressure (FIG. 3) as shown by the arrow P is applied to both sides of the absorber 30, in the range where the narrow portion N of the first opening 32A is formed. Then, both edge portions of the first opening 32A are first brought into contact with each other to form a portion closed inside the width direction D2 (FIGS. 4, 5A, and 5B). Here, even when the leg pressure is applied, both edges of the first opening 32A that first abuts work like a support rod (stopper), and other than the abutting position and the vicinity thereof At the position, both edges of the penetrating part 35 are less likely to approach each other, that is, the penetrating part is difficult to close in the width direction D2. In particular, in the wide portion W (or wide portion W ′) that is located at least in front of the first opening 32A, that is, away from the position where the leg pressure acts most strongly, the penetrating portion 35 is difficult to close (FIG. 4, FIG. 6A and FIG. 6B). Therefore, even when strong leg pressure is applied to the absorbent article 100 from both sides, the through portion 35 can be partially maintained.

  When the wide portion W is viewed from the top, the width of the second opening 32B is smaller than the width of the first opening 32A, and when the narrow portion N is viewed from the top, the second opening 32B is the first opening 32A. It is larger than the width. That is, in the range in which the wide portion W is formed, both edges of the second opening 32B protrude beyond the both edges of the first opening 32A to the inside in the width direction D2. In the range where the narrow portion N is formed, both edges of the first opening 32A protrude inward in the width direction D2 beyond both edges of the second opening 32B. In other words, the outline of the edge of the first opening 32A and the outline of the edge of the second opening 32B intersect in plan view.

  When both the widths of the openings formed in the stacked upper and lower layers are increased, the air permeability can be improved, but the absorption capacity is reduced. On the other hand, when the widths of the openings formed in the stacked upper and lower layers are both reduced, both the openings are easily crushed and air permeability is lowered. However, according to the above-described embodiment, the width of one of the openings formed in the upper and lower layers is made larger and the other is made smaller, so that the air permeability is improved and the absorption capacity (the amount of body fluid that can be absorbed by the absorber 30). ) Can be obtained in a well-balanced manner.

  In addition, when the wide portion of the first opening is viewed from above, both edges of the second opening 32B provided in the lower layer (second layer 30B) protrude inward in the width direction. A part of the body fluid can be quickly drawn into the absorber of the lower layer (second layer 30B) from the part. Part of the body fluid is guided rearward along the opening, but where the narrow portion N of the first opening 32A is formed, leg pressure is applied to the upper layer (first layer 30A). A portion where the first opening 32A is closed and the second opening 32B of the lower layer (second layer 30B) is not closed is formed (FIGS. 4 and 5B), and a groove-like passage through which bodily fluids flow is formed in the lower layer (first 2 layers 30B). Therefore, the bodily fluid that has been received in the front and has reached the lower layer (second layer 30B) is guided rearward along a passage located away from the skin. Thereby, since the quantity of the bodily fluid which touches skin can be made small, a wearing feeling can also be improved.

  In the form of FIG. 3, a wide portion W is provided in front of the first opening 32A, and a wide portion W ′ is provided in the rear. However, the wide portion W may be provided in the front and not in the rear. The body fluid derived from the front reaches the wide portion W ′ and can be diffused / absorbed from the rear edge portion. However, a large amount of the body fluid is provided by providing the rear wide portion W ′ (second wide portion). Even if the bodily fluid reaches the rear end of the opening, it becomes possible to receive the bodily fluid and prevent side leakage at the rear.

  As shown in FIG. 3, the first opening 32A is provided in the crotch corresponding region RC2. The first opening 32A may be included in the front-rear direction range of the crotch corresponding region RC2, or may be disposed beyond the front end and / or the rear end of the crotch corresponding region RC2. Moreover, it may extend from the crotch corresponding region RC2 to the rear end region RR2 adjacent to the rear thereof. The same applies to the arrangement of the second opening 32B, and the same applies to the arrangement of the penetrating portion 35, which is a portion where the first opening 32A and the second opening 32B overlap.

  Further, the first opening 32A can be disposed so as to overlap with a portion where the body fluid discharge port corresponding part Q is located. The same applies to the arrangement of the second openings 32B and the arrangement of the through portions 35.

  Further, the wide portion W in front of the first opening 32A can be arranged so as to overlap with the portion where the body fluid discharge port corresponding portion Q is located or the vicinity thereof. Thereby, the discharged body fluid can be received first in the front. As described above, the penetrating portion 35 can be maintained within the range in which the wide portion W is formed even when the leg pressure P is applied during wearing (FIGS. 4 and 6B). Thereby, a hollow can be formed by the penetration part 35 and the back sheet | seat 21, and a bodily fluid can be received in this hollow. Therefore, even when a large amount of body fluid is discharged at a time with the leg pressure P applied, side leakage can be prevented.

  Moreover, in 1st Embodiment, since the 1st opening part 32A which has a wider width | variety is located in the upper layer of an absorber, the inlet into which a bodily fluid flows can be enlarged. For this reason, even when the body fluid is discharged at once, the body fluid can be introduced from the wide portion W of the first opening 32A, and the effect of preventing side leakage can be further improved.

  Furthermore, as described above, a part of the body fluid received by the front wide portion W is diffused and absorbed in the absorber at the edge of the opening 32A and the opening 32B, and is guided backward. .

  In the present embodiment, the first opening 32A has a wide portion W and a wide portion W ′ at the front end portion and the rear end portion, respectively, and as a whole, a curved contour constricted at the center in the front-rear direction. have. On the other hand, the second opening 32B has a curved outline that swells at the center in the front-rear direction as a whole. By making the shape of the opening curve, it is possible to guide the body fluid without stagnation. However, the shapes of the first opening 32A and the second opening 32B are not limited to those illustrated. For example, the first opening 32A and the second opening 32 may have a planar view shape including a vertex (angular).

  When the number of the first openings 32A and the second openings 32B is one each and the first openings 32A and the second openings 32B are both provided at the center in the width direction D2 as shown in the figure, The maximum width a of the wide portion W (or wide portions W, W ′) of the first opening 32A is preferably 55 to 90 mm, and more preferably 58 to 70 mm. By setting the maximum width a of the wide portion W to 55 mm or more, even body fluid discharged at a stretch can be received by the wide portion W, and side leakage can be prevented. Moreover, the absorption capacity | capacitance of the absorber of the wide part W vicinity can be ensured because the maximum width a of the wide part W shall be 90 mm or less.

  The shape of the wide portion W in plan view is substantially elliptical (a shape including an ellipse), but may be a shape including a polygon such as a circle, a triangle, or a rectangle. However, by making the shape of the wide portion W in plan view a shape including an ellipse or a circle, body fluid can be diffused and absorbed relatively uniformly from the front edge of the wide portion W, and the absorber to be used This is preferable because the amount of is increased.

  The minimum width b of the narrow portion N of the first opening 32A is preferably 8 to 30 mm. By setting the minimum width b of the narrow portion N to 8 mm or more, the function of inducing body fluid can be enhanced. Moreover, the absorption capacity | capacitance of the absorber of the narrow part N vicinity can be ensured because the minimum width b of the narrow part N shall be 30 mm or less.

  The maximum value of the width of the second opening 32B is preferably 18 to 40 mm. Further, the width direction D2 of the edge portion of the second opening portion 32B protruding from the edge portion of the first opening portion 32A at the position of the maximum width of the wide portion W (or wide portions W, W ′) of the first opening portion 32A. The length (the distance in the width direction D2 between the edge of the first opening 32A and the edge of the second opening 32B) is preferably 20 to 36 mm. The length in the width direction D2 of the edge of the first opening 32A protruding from the edge of the second opening 32B at the position of the minimum width of the narrow portion N of the first opening 32A (the length of the first opening 32A). The distance in the width direction D2 between the edge and the edge of the second opening 32B is preferably 5 to 16 mm.

  In addition, in this form, although the absorber 30 is comprised by 2 layers, it can also be comprised by 3 or more layers. In that case, it is preferable that each layer includes an opening, and a portion where each opening overlaps, that is, a through portion of the absorber 30.

(Second Embodiment)
In FIG. 7, the elements on larger scale of the absorber 230 of the absorbent article by 2nd Embodiment are shown. FIG. 8 shows a state in which leg pressure P is applied to both sides of the absorber 230 of FIG. FIG. 9 shows a change of the cross section along line M2-M2 from the state shown in FIG. 7 to the state shown in FIG. 9A is a sectional view taken along line M2-M2 of FIG. 7, and FIG. 9B is a sectional view taken along line M2-M2 of FIG. FIG. 10 shows a change in the cross section taken along line E2-E2 from the state shown in FIG. 7 to the state shown in FIG. That is, FIG. 10A shows a cross-sectional view taken along line E2-E2 of FIG. 7, and FIG. 10B shows a cross-sectional view taken along line E2-E2 of FIG.

  In the first embodiment described above, the first layer 30A is arranged on the upper side (top sheet 22 side or skin facing surface side), and the second layer 30B is arranged on the lower side (back sheet 21 side or outer surface side). In the second embodiment, the first layer 230A is disposed on the lower side, and the second layer 230B is disposed on the upper side. That is, the first layer 230A is the lower layer and the second layer 230B is the upper layer. Therefore, the first opening 232A is located in the lower layer and the second opening 232B is located in the upper layer. Other configurations (size, shape, etc. of the opening) of the second embodiment can be the same as those of the first embodiment.

  Even in the second embodiment, even when strong leg pressure P is applied to the absorbent article from both sides for the same reason as described in the first embodiment, the penetrating portion 235 can be partially maintained. Therefore (FIG. 8 and FIG. 10B), good air permeability can be obtained. Further, similarly to the first embodiment, it is possible to obtain an effect that the absorption capacity can be secured and leakage can be prevented.

  In the second embodiment, the second opening 232B is disposed on the upper side, and the first opening 232A is disposed on the lower side. Therefore, when the leg pressure P is applied when the absorbent article is mounted, the first opening 232A of the lower layer (first layer 230A) is closed and closed at the place where the narrow portion N of the first opening 232A is provided. The second opening 232B of the upper layer (second layer 230B) is not closed (FIGS. 8 and 9B), and a groove-like passage through which body fluid flows is formed in the upper layer (second layer 230B). Will be. Therefore, the body fluid received in the front can be promptly guided to the rear along the passage formed in the upper layer (second layer 230B) while being absorbed by the surrounding absorber. Even when the body fluid is discharged directly into the passage, the body fluid can be guided forward and backward along the passage.

(Modification of opening)
11A and 11B show a plan view shape of the opening according to the modification. The following modified examples can be applied as the configuration of any opening in the first embodiment and the second embodiment. In the example of FIG. 11A, the second opening 32B of the second layer 30B extends forward and beyond the front end of the first opening 32A. The second opening 32B extends rearward beyond the rear end of the first opening 32A. The length of the second opening 32B in the front-rear direction D1 is larger than the length of the first opening 32A in the front-rear direction D1. With such a configuration, the induction of body fluid forward and backward can be promoted.

  In the example of FIG. 11B, the front end of the second opening 32B is at the same position as the front end of the first opening 32A, but the second opening 32B is behind and beyond the rear end of the first opening 32A. It is extended. With this configuration, it is possible to promote the rearward induction of body fluid.

  11A and 11B, the ratio of the length of the second opening 32B in the front-rear direction D1 to the length of the first opening 32A in the front-rear direction D1 depends on the use of the absorbent article. It can be appropriately selected depending on the configuration. For example, the length of the second opening 32B in the front-rear direction D1 can be 1.2 times or more the length of the first opening 32A in the front-rear direction D1, and can be 1.5 times or more. .

(Third embodiment)
In FIG. 12, the elements on larger scale of the absorber 330 in the absorbent article by 3rd Embodiment of the planar view are shown. In the third embodiment, a plurality of first openings and second openings are provided. In the illustrated form, the first layer 330A includes two first openings 332A and 332A, and the second layer 330B includes two second openings 332B and 332B. The first openings 332A and 332A are provided separately on each side of the front-rear direction center line CL. Similarly, two second openings 332B and 332B that overlap the first openings 332A and 332A are also provided separately on each side of the front-rear direction center line CL. The separation width of the second openings 332B and 332B may be about 5 to 20% of the minimum width of the absorber 330 in the crotch corresponding region CR2 (the minimum width of the constricted portion when the absorber has a constricted portion). it can.

  In 3rd Embodiment, since the 1st opening part 332A and the 2nd opening part 332B are provided with two or more, the effect which guides a bodily fluid to the front-back direction D1 increases. In addition, as shown in FIG. 12, when the first opening 332A and the second opening 332B are provided on each side of the front-rear direction center line CL, the mounting position of the absorbent article is shifted in the width direction. Even so, the body fluid can be guided well in the front-rear direction.

  Note that the first opening 332A in the third embodiment includes a front wide portion W, a narrow portion N, and a rear wide portion W ′, as in the first and second embodiments. The shape of the wide portion W (wide portions W, W ′) has a shape obtained by dividing a substantially ellipse in half in the minor axis direction. In the form of FIG. 12, the shape of the wide portion W of each first opening 332A is a shape that swells outward in the width direction.

  As described above, the pad type disposable diaper has been described as an example of a specific form. However, this form can be applied to sanitary napkins in addition to disposable diapers of other forms such as a tape type and a pants type. it can.

21 Back sheet 22 Top sheet 24 Gather sheet 25 Intermediate sheet 30, 230 Absorbers 30A, 230A First layer 30B, 230B Second layer 32A, 232A First opening 32B, 232B Second opening 35, 235 Through part 100 Absorption Property article CL center line in the front-rear direction (center line along the first direction D1)
D1 Longitudinal direction (first direction)
D2 width direction (second direction)
G Gather N Narrow portion RC1 Crotch corresponding region RF1 (absorbent article) Front region RR1 (absorbent article) rear region RC2 (absorber) crotch corresponding region RF2 (absorber) front Region RR2 Rear region W (of absorber) W, W ′ Wide portion P Leg pressure Q Body fluid discharge port corresponding portion

Claims (7)

An absorbent article having an absorbent body, having a predetermined length in the front-rear direction, and a predetermined width in the width direction perpendicular to the front-rear direction,
The absorber has a laminated first layer and second layer,
The first layer includes a first opening extending in the front-rear direction, the second layer includes a second opening extending in the front-rear direction, and the first layer and the second layer include the first opening The first opening and the second opening are stacked so as to have a portion overlapping in plan view,
The first opening has at least a wide part formed at the front, and a narrow part formed adjacent to the wide part at the rear,
The second opening has a width smaller than the width of the first opening in the range where the wide portion is formed, and is wider than the width of the first opening in the range where the narrow portion is formed. Absorbent article having a large width.   The absorbent article according to claim 1, wherein the wide portion is disposed at or near the body fluid discharge port corresponding portion corresponding to the body fluid discharge port of the wearer when worn.   The absorptive article according to claim 1 or 2 in which said 1st opening has the 2nd wide part adjacent to the back of said narrow part.   The absorbent article according to claim 3, wherein the shape of the second opening in plan view has a curved outline that swells at the center in the front-rear direction.   The absorbent article according to any one of claims 1 to 4, wherein the first layer is provided on the skin facing surface side, and the second layer is provided on the opposite side of the skin facing surface.   The absorbent article according to any one of claims 1 to 4, wherein the second layer is provided on the skin facing surface side, and the first layer is provided on the opposite side of the skin facing surface.   A plurality of the first openings and the second openings are provided, and the first openings and the second openings are provided separately on each side of the center line extending in the front-rear direction. The absorptive article according to any one of claims 1 to 6.

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