JP2015107219A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which moisture permeability of a rear surface sheet side is high, and a body fluid is less likely to leak from the rear surface sheet side.SOLUTION: An absorbent article 1 comprises an absorber 4 and a moisture-permeable rear surface sheet 3 disposed on a non skin-facing surface side of the absorber 4, and has an excretion-part facing part B disposed oppositely to an excretion part of a wearer at the time of wearing. Between the absorber 4 and the rear surface sheet 3 at the excretion-part facing part B, a spacer member 10 for separating the absorber 4 and the rear surface sheet 3 in their thickness direction is interposed. The spacer member 10 is formed by laminating a plurality of water-repellent net-like sheets 11, 12 in which a plurality of nets 11A, 12A are formed regularly. The net-like sheets 11, 12, which have a lamination structure and are adjacent to each other in the thickness direction in the lamination structure, are disposed offset so that the nets 11A, 12A do not match with each other.

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and a disposable diaper.

  In an absorbent article comprising an absorbent body and a back sheet disposed on the non-skin-facing surface side of the absorbent body, the humidity in the wearing during use is reduced to prevent stuffiness and skin irritation caused by it. For this purpose, moisture permeable sheets are often used as the back sheet. As a typical example of the moisture permeable sheet, there is a porous film in which many fine pores are formed. The pores of this porous film are very small and allow water vapor to pass through to be released to the outside, but body fluids such as urine and blood are difficult to leak out due to surface tension.

  On the other hand, when the absorbent article is worn, it is necessary to increase the moisture permeability of the back sheet from the viewpoint of reducing the humidity in the dressing to prevent stuffiness and improving the feeling of wearing, and the back sheet is made of a porous film. In some cases, it is necessary to increase the size of the holes formed therein. However, when the pores of the porous film are enlarged, the waterproof property is lowered, and the body fluid easily oozes out through the pores. Therefore, Patent Document 1 discloses that the back sheet of the absorbent article is liquid impermeable or liquid hardly permeable and moisture permeable for the purpose of preventing exudation of body fluid while increasing the moisture permeability of the back sheet. The use of a composite sheet in which a fiber layer is bonded to one surface of a porous film is described. In the absorbent article described in Patent Document 1, the absorber and the back sheet (composite sheet) are in contact.

  In Patent Document 2, as an absorbent article with improved moisture permeability, a breathable water-repellent sheet having an air permeability in a specific range is disposed between the absorber and the moisture-permeable back sheet, and A material is described in which a space forming material having a space in which air can flow in the thickness direction and / or the plane direction is disposed between the breathable water-repellent sheet and the back sheet. Patent Document 2 describes, as a specific example of the space forming material, a large number of long fibers oriented in one direction, a nonwoven fabric, and a communication hole (open cell) foam.

  Patent Document 3 describes an absorbent article in which spacer members for separating the absorber and the back sheet are provided in a streak shape at a plurality of locations between the absorber and the back sheet. . Conventionally, this spacer member has a strong tendency that the absorbent body that has absorbed body fluid swells to the wearer's skin side, in which case a gap is generated between the wearer's buttocks and the absorbent article, causing liquid leakage It was adopted in view of the fact that Patent Document 3 also describes that the spacer member is formed of a foamed hot melt adhesive. According to Patent Document 3, by providing a spacer member between the absorber and the back sheet, the absorber easily expands to the back sheet side at the time of liquid absorption. Therefore, expansion of the absorber to the skin side can be suppressed. It is said that liquid leakage can be prevented.

JP 2006-320428 A JP 2007-260392 A JP 2011-24888 A

  The present invention relates to an absorbent article having high moisture permeability on the back sheet side and in which bodily fluids are difficult to exude from the back sheet side.

  The present invention comprises an absorbent body and a moisture-permeable back sheet disposed on the non-skin facing surface side of the absorbent body, and has an excretory part-facing portion that is disposed to face the excretory part of the wearer when worn. A spacer member is interposed between the absorber and the back sheet in the excretory part facing part, and the spacer and the back sheet are separated in the thickness direction thereof, and the spacer member Has a laminated structure formed by laminating a plurality of water-repellent mesh sheets regularly formed with a lot of meshes. In the laminated structure, two mesh sheets adjacent in the thickness direction are The absorbent article is arranged so as to be shifted so that the meshes do not match.

  According to the present invention, there is provided an absorbent article having high moisture permeability on the back sheet side and in which body fluid does not easily leak from the back sheet side.

FIG. 1 is a plan view schematically showing a part of the skin facing surface side (surface sheet side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3A and FIG. 3B are plan views schematically showing examples of stacking spacer members in the sanitary napkin shown in FIG. FIG. 4 is a cross-sectional view schematically showing an enlarged part (spacer member and its peripheral portion) of FIG.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. 1 and 2, the napkin 1 of the present embodiment is interposed between a top sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and both sheets 2 and 3. An absorbent main body 5 including the absorbent body 4 is provided.

  In the present specification, the skin facing surface is a surface (side relatively close to the wearer's skin) directed to the skin side of the wearer in the wearing state in the napkin 1 and its constituent members (for example, the absorbent main body 5). Yes, the non-skin facing surface is a surface (a side relatively distant from the wearer's skin) that is directed to the side opposite to the skin side of the wearer in the wearing state in the napkin 1 and its constituent members.

  As shown in FIG. 1, the napkin 1 (absorbent main body 5) includes an excretory part facing part B, which is an area disposed opposite to the wearer's liquid excretion part (such as the vaginal opening) when worn, and the excretion part facing part B. It has the front part A more arranged on the wearer's stomach side (front side) and the rear part C arranged on the back side (rear side) of the wearer than the excretion part facing part B. Moreover, the napkin 1 (absorbent main body 5) has the vertical direction X equivalent to a wearer's front-back direction at the time of wear, and the horizontal direction Y orthogonal to this. The vertical direction X of the napkin 1 (absorbent main body 5) is a direction extending between the front part A and the rear part C via the excretory part facing part B. In addition, "at the time of wearing" here means a state in which a normal proper wearing position (correct wearing position of the absorbent article) is maintained, and the absorbent article is in a state shifted from the wearing position. Is not included.

  In addition to the absorbent main body 5, the napkin 1 further includes a pair of wing portions 7, 7 extending outward in the lateral direction Y from both side portions along the vertical direction X of the excretory portion facing portion B of the absorbent main body 5. have. In the absorbent article of the present invention, when the excretory part facing part has a wing part like the napkin 1 of the present embodiment, the longitudinal direction of the absorbent article (the longitudinal direction of the absorbent article, (X direction) is a region having a wing portion (a region sandwiched between a base on one side in the vertical direction of the wing portion and a base on the other side). The excretion part opposing part in the absorbent article which does not have a wing part is the transverse direction (width direction of an absorbent article, in the figure) generated when the absorbent article is folded into a tri-fold individual form. The two folding lines (not shown) crossing in the Y direction) are the same as the area surrounded by the first folding line and the second folding curve, counting from the front end in the longitudinal direction of the absorbent article, or The region is narrower than the region.

  As shown in FIG. 2, the top sheet 2 covers the entire skin facing surface of the absorbent body 4, and both side edges along the longitudinal direction X are substantially the same position as both side edges along the longitudinal direction X of the absorbent body 4. Exist. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. A side flap portion 6 is also formed. The back sheet 3 and the side sheet 8 are bonded to each other by known bonding means such as an adhesive, heat seal, ultrasonic seal, and the like at the extended portions from both side edges along the longitudinal direction X of the absorber 4. Further, as shown in FIG. 1, the top sheet 2 and the back sheet 3 extend outward in the longitudinal direction X from the front end and the rear end in the longitudinal direction X of the absorbent body 4. Are joined together to form an end seal portion. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive.

  On both sides along the longitudinal direction X of the skin facing surface of the absorbent main body 5 (skin facing surface of the topsheet 2), as shown in FIG. A pair of side sheets 8, 8 are arranged over substantially the entire length in the longitudinal direction X of the absorbent main body 5. The pair of side sheets 8 and 8 are joined to the absorbent main body 5 (surface sheet 2) by a joining line 9 extending in the longitudinal direction X, respectively.

  As shown in FIG. 1, the side flap portions 6 project greatly outward in the lateral direction Y at the excretory portion-facing portion B, whereby a pair of side flap portions 6 are provided on both the left and right sides along the longitudinal direction X of the absorbent main body 5. The wing portions 7, 7 are extended. The wing portion 7 has a substantially trapezoidal shape in which the lower base (side longer than the upper base) is located on the side of the absorbent main body 5 in a plan view as shown in FIG. The wing part adhesive part (not shown) which fixes this wing part 7 to clothes, such as shorts, is formed. The wing portion 7 is used by being folded back to the non-skin facing surface (outer surface) side of the crotch portion of clothes such as shorts. Moreover, the non-skin opposing surface (non-skin opposing surface of the back surface sheet 3) of the absorptive main body 5 is formed with a main body adhesive portion (not shown) that fixes the absorptive main body 5 to clothing such as shorts. . The wing part adhesive part and the main body adhesive part are covered with a release sheet (not shown) made of a film, a nonwoven fabric, paper or the like before use.

  As shown in FIG. 1, the surface sheet 2 and the absorbent body 4 are integrally recessed toward the back sheet 3 side on the skin facing surface of the absorbent main body 5 (skin facing surface of the top sheet 2). A groove 51 having a closed shape in plan view is formed. The groove | channel 51 can be formed in accordance with a conventional method by embossing, such as a pressing process with or without heat, or ultrasonic embossing. In the groove 51, the topsheet 2 and the absorber 4 are integrated by heat fusion or the like. Since the groove 51 is formed on the skin-facing surface of the napkin 1, the diffusion of the liquid in the planar direction of the absorbent body 4 is effectively suppressed, and the twisting of the absorbent body 4 can be prevented.

  The absorber 4 in this embodiment consists of a laminated body of the absorbent sheets 401 and 402 as shown in FIG.1 and FIG.2, and has the middle-high part 42 in the excretion part opposing part B. As shown in FIG. The absorbent body 4 has a structure in which another absorbent sheet 402 is included in the folding structure of one absorbent sheet 401, and the other absorbent sheet 402 is arranged in the middle-high portion 42. The middle-high part 42 is formed only in the excretion part opposing part B, and is not formed in the front part A and the rear part C. As shown in FIG. 2, the middle-high portion 42 is a portion where the number of laminated absorbent sheets constituting the absorbent body 4 is larger than the portion positioned around the absorbent sheet 4 and is thicker. For this reason, the napkin 1 forms the protruding part which protruded in the excretion part opposing part B at the surface sheet 2 side (skin opposing surface side of the napkin 1).

  The absorbent body 4 includes a main absorbent body 40 that forms the outer shape of the absorbent body 4, and an auxiliary absorbent body 41 that is smaller than the main absorbent body 40 that is arranged on a part of the main absorbent body 40. Yes. The main absorbent body 40 has a substantially rectangular shape with rounded corners in plan view, and is composed of a single absorbent sheet 401 extending from the front part A through the excretory part facing part B to the rear part C, and is supplemented by auxiliary absorption. The body 41 has a substantially rectangular shape in plan view, and is disposed from the excretory part facing part B to the rear part C in the vicinity thereof. The main absorbent body 40 has a structure in which a single absorbent sheet 401 is folded into a multi-layer structure, and one sheet of absorbent sheet 401, 401 in the main absorbent body 40 is opposed to each other. An auxiliary absorbent body 41 formed by folding the absorbent sheet 402 is disposed. More specifically, the main absorbent body 40 is composed of a single absorbent sheet 401 having a rectangular shape in plan view, which is longer in the lateral direction Y (width) than the napkin 1. Both side portions along the direction X are folded back to the non-skin facing surface side of the absorbent sheet 401 and both side edges along the vertical direction X are overlapped at the center in the horizontal direction Y. Further, the auxiliary absorbent body 41 is configured by folding one sheet of a rectangular rectangular absorbent sheet 403 in the lateral direction Y, and has a three-layer structure. In this way, by arranging the auxiliary absorbent body 41 in a part of the main absorbent body 40 (part located in the excretory part facing part B), the absorption capacity of a part of the absorbent body 4 is easily and efficiently increased. be able to.

  In addition, it replaces with arrange | positioning between the two mutually opposing absorbent sheets 401 and 401 which comprise the main absorber 40, and the auxiliary | assistant absorber 41 is the upper side (skin opposing surface side) which comprises the main absorber 40. May be laminated on the skin facing surface side of the absorbent sheet 401, or may be laminated on the non-skin facing surface side of the lower (non-skin facing surface side) absorbent sheet 401 constituting the main absorbent body 40. Also good. Further, the absorbent sheets may not be joined, or may be adhered by a sparsely spread adhesive or the like.

  In the absorber 4, the thickness of the middle-high portion 42 is preferably 0.7 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less. More specifically, the thickness of the middle-high portion 42 is preferably 0.7 mm or more and 5 mm or less, and more preferably 1 mm or more and 4 mm or less. By setting the thickness of the middle-high portion 42 within this range, it becomes easy to achieve both good wearing feeling and high absorption performance in the excretory portion-facing portion B where the middle-high portion 42 is formed. Moreover, when the absorbent article is equipped with the wing part like the napkin 1 of this embodiment, it becomes easy to suppress the twist of the absorber in the excretion part opposing part at the time of the wear. Regarding the thickness of the absorbent body 4 other than the middle and high portions 42, that is, the thickness of the main absorbent body 40 (a laminated body of two absorbent sheets 401 and 401 facing each other), it is preferably 0.3 mm or more, and more preferably 0. It is 5 mm or more, preferably 3 mm or less, more preferably 2.5 mm or less. More specifically, the thickness of the main absorbent body 40 is not less than 0.5 mm and not more than 3 mm, and further not less than 0.6 mm and not more than 2.5 mm, thereby enhancing the high absorption performance and the followability to the wearer's movement. It is preferable from the viewpoint. The thickness of each part of the absorber 4 described above is measured by the following method.

<Measurement method of absorber thickness>
The absorber, which is a measurement object, is placed in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Was used for measuring the thickness in the present invention. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  As one of the main characteristics of the napkin 1 of this embodiment, as shown in FIG. 2, between the absorber 4 and the back sheet 3 in the excretory part facing part B, the absorbent body 4 and the back sheet 3 are placed between them. The point which the spacer member 10 spaced apart in the thickness direction (thickness direction of the napkin 1. The up-down direction of FIG. 2) is interposed is mentioned. The spacer member 10 has a laminated structure formed by laminating a plurality of water-repellent net-like sheets in which a large number of meshes are regularly formed. In the present embodiment, the spacer member 10 has a two-layer structure in which two mesh sheets 11 and 12 are laminated. In the present embodiment, the spacer member 10 is disposed not only on the excretory part facing part B but also on the entire area of the non-skin facing surface of the absorbent body 4 (main absorbent body 40). The visual shape is the same shape and substantially the same size.

  FIG. 3 illustrates a laminated structure (two-layer structure) of mesh sheets 11 and 12 included in the spacer member 10. In FIG. 3, the mesh sheet 11 is located on the upper side, and the mesh sheet 12 is located on the lower side. In the napkin 1, as shown in FIG. 2, the mesh sheet 11 is the mesh pattern closest to the absorber 4. The reticulated sheet 12 is a reticulated sheet closest to the back sheet 3 (farthest from the absorber 4). The net-like sheet 11 has a large number of grid-like nets 11A, and the many nets 11A are arranged at equal intervals in one direction and a direction perpendicular to the one direction. Between the two adjacent meshes 11A and 11A, there is a linear member 11B that defines the mesh 11A. The large number of meshes 11A have the same shape and the same size as each other, and in the form shown in FIG. 3, form a square shape (square shape) in plan view. The mesh sheet 12 has the same configuration as the mesh sheet 11, and in the figure, reference numeral 12 </ b> A denotes a mesh of the mesh sheet 12, and reference numeral 12 </ b> B denotes a linear member of the mesh sheet 12. As described above, in the present embodiment, the plurality of mesh sheets 11 and 12 constituting the spacer member 10 (laminated structure) have the same mesh pattern.

  As shown in FIGS. 2 and 3, in the spacer member 10 (laminated structure of the mesh sheets 11 and 12), the two mesh sheets 11 and 12 adjacent to each other in the thickness direction (the thickness direction of the napkin 1) are The meshes 11A and 12A are arranged so as not to coincide with each other. Here, “the meshes do not match” means that one mesh 11A and the other mesh 12A are completely in a plan view of the two mesh sheets 11 and 12 (spacer member 10) superimposed as shown in FIG. In other words, a linear member 12B (a part other than the mesh 12A) of the mesh sheet 12 located on the lower side of the mesh sheet 11A of the mesh sheet 11 located on the relatively upper side. Are forms that can be visually confirmed, and in the two reticulated sheets overlapped, forms other than such forms correspond to “the meshes do not match”.

  In the spacer member 10 shown in FIG. 3A, two mesh sheets 11, 12 having the same mesh pattern and adjacent to each other in the thickness direction are arbitrary 1 in the longitudinal direction X of the napkin 1. The meshes 11 </ b> A (12 </ b> A) are arranged so as to be shifted by half the length of the mesh 11 </ b> A (12 </ b> A) in the corresponding direction (vertical direction X).

  In the spacer member 10 shown in FIG. 3A, the two mesh sheets 11 and 12 may be similarly displaced in the horizontal direction Y as well as the vertical direction X of the napkin 1. That is, the two mesh sheets 11 and 12 having the same mesh pattern and adjacent in the thickness direction can be divided into any one mesh 11A (12A) in the longitudinal direction X and the transverse direction Y orthogonal thereto. ) In the direction (vertical direction X or horizontal direction Y) may be shifted by half. With such a configuration, in the plan view of the spacer member 10 as shown in FIG. 3, the area of the “apparent mesh” defined by the linear members 11B and 12B of the both mesh sheets 11 and 12 can be reduced. Thus, the absorber 4 can be separated from the back sheet 3 while keeping the contact area (easiness of wetting) between the adjacent members of the absorber 4, the spacer member 10 and the back sheet 3 small.

  In the spacer member 10 shown in FIG. 3B, the mesh patterns are the same, and the two mesh sheets 11 and 12 adjacent to each other in the thickness direction are arranged with the mesh arrangement direction shifted. . That is, the arrangement direction of the mesh 11A having a square shape (square shape) in the plan view of the mesh sheet 11 coincides with the vertical direction X and the horizontal direction Y of the napkin 1, whereas the square shape (in plan view) of the mesh sheet 12 ( The arrangement direction of the square-shaped mesh 11A does not coincide with the vertical direction X and the horizontal direction Y, but coincides with a direction (oblique direction) intersecting both directions X and Y.

  As described above, since the spacer member 10 is interposed between the absorber 4 and the back sheet 3, the spacer member 10 is interposed between the absorber 4 and the back sheet 3 as shown in FIG. 4. A space portion formed of the meshes 11A and 12A of the mesh sheets 11 and 12 to be formed is formed, and the contact between the absorber 4 and the back sheet 3 is inhibited by the space portion. It becomes difficult for body fluids such as blood to adhere to the back sheet 3, and the body fluid oozes out from the back sheet 3 to the outside of the napkin 1. Moreover, the space part (mesh 11A, 12A) of the spacer member 10 can function as a passage for air or water vapor that penetrates the napkin 1 in the thickness direction. Therefore, in the napkin 1, it is possible to improve the moisture permeability of the back sheet 3 from the viewpoint of reducing the humidity in the wearing at the time of wearing and preventing stuffiness. Even if a highly moisture-permeable porous film having the above is used, exudation of body fluid from the back sheet 3 side is prevented. That is, it can be said that the napkin 1 is an absorbent article that has high moisture permeability on the back sheet 3 side and that does not easily exude body fluid from the back sheet 3 side.

  When the body pressure of the wearer is applied to the napkin 1 when the napkin 1 is worn, as shown in FIG. 4, the absorbent body 4 and the spacer member 10 come into close contact with each other, and the mesh sheet in the absorbent body 4 (absorbent sheet 401). A portion corresponding to the mesh 11A of the eleven protrudes toward the spacer member 10, and the protruding portion can enter the mesh 11A. However, even if there is such deformation (protrusion) on the non-skin facing surface side (opposite surface side to the spacer member 10) of the absorbent body 4, the thickness T1 of the spacer member 10 is the deformation amount of the absorbent body 4, More specifically, the contact between the absorbent body 4 and the back sheet 3 can be prevented if it is made larger than the protrusion length T2 of the protrusion. The thickness T1 of the spacer member 10 is preferably 0.2 mm or more, more preferably 0.5 mm or more, and preferably 4.0 mm or less from the viewpoint of more reliably preventing contact between the absorber 4 and the back sheet 3. More preferably, it is 3.5 mm or less, More specifically, Preferably it is 0.2-4.0 mm, More preferably, it is 0.5-3.5 mm.

  Moreover, in this embodiment, when separating the absorber 4 and the back surface sheet 3 in the thickness direction, a spacer member having a single-layer structure is not interposed therebetween, but a plurality (two) of nets The spacer member 10 having a laminated structure of the sheets 11 and 12 is disposed in an interposition. With such a configuration, the flexibility of the spacer member 10 can be increased. That is, when the spacer member interposed between the absorber 4 and the back sheet 3 has a single layer structure, the thickness of the single layer structure is moderately large in order to prevent contact between the absorber 4 and the back sheet 3. As a result, the rigidity of the spacer member (single layer structure) is increased and the flexibility is poor. On the other hand, when the spacer member 10 has a laminated structure of a plurality of mesh sheets 11 and 12 as in the present embodiment, the thickness of each mesh sheet 11 and 12 can be made relatively thin. While preventing the contact between the body 4 and the back sheet 3, it is possible to effectively suppress an increase in rigidity and a decrease in flexibility of the spacer member 10. And since the spacer member 10 is flexible, the improvement of the fitting property at the time of wearing of the napkin 1 and a feeling of wear can be expected.

  Further, as another advantage of the spacer member 10 having a laminated structure of a plurality of mesh sheets 11 and 12, it is easy to make the mesh patterns of the plurality of mesh sheets constituting the spacer member 10 different from each other. A point is mentioned. By selecting an appropriate mesh pattern according to the arrangement position in the thickness direction of the mesh sheet, it is possible to more appropriately control the exudation of body fluid from the back sheet 3 and the moisture permeability and breathability on the back sheet 3 side. It becomes.

  In addition, if the spacer member 10 having a laminated structure is employed, the risk of damage to the absorber 4 can be reduced. When a single mesh sheet is adopted as the spacer member 10 having a single layer structure, and the mesh of the mesh sheet is simply made fine, the absorber 4 defines the mesh on the upper surface (skin facing surface) of the mesh sheet. The area in contact with the formed linear member is increased, and the absorber 4 is easily damaged by a load caused by pressurization. On the other hand, when a plurality of mesh sheets are combined to form a spacer member 10 having a laminated structure as in the present invention, the laminated structure is arranged so that the mesh as the laminated structure becomes fine in plan view. The area where the absorbent body 4 comes into contact with the linear member constituting the mesh sheet can be reduced on the upper surface (skin facing surface). Therefore, the absorber 4 can be deformed so as to release the applied pressure such as body pressure downward in the thickness direction (non-skin facing surface side), for example, convex toward the non-skin facing surface side (spacer member 10 side). Can be curved and deformed, thereby reducing the risk of damage to the absorber 4. On the other hand, since the linear member of the mesh sheet facing the non-skin facing surface of the absorbent body 4 can hold down the portion of the absorbent body 4 deformed downward, the contact between the absorbent body 4 and the back sheet 3 is prevented. However, excessive deformation of the absorber 4 is suppressed, and thus damage to the absorber 4 can be prevented.

  In order to more effectively prevent the body fluid from seeping out from the back sheet 3, it is effective to reduce the contact area between the absorber 4 and the spacer member 10 serving as a body fluid supply source. From this point of view, it is preferable that the mesh sheet 11 closest to the absorber 4 among the plurality of mesh sheets 11 and 12 constituting the spacer member 10 (laminated structure) has a relatively coarse mesh. Therefore, in the spacer member 10 having a two-layer structure as in the present embodiment, the mesh sheet 11 closest to the absorber 4 (in contact with the absorber 4) has a relatively coarse mesh and is the most in the back sheet 3. The mesh sheet 12 that is in close proximity (contacts with the back sheet 3) preferably has a relatively fine mesh.

  Although not shown, when the spacer member 10 (laminated structure) is formed by laminating three mesh sheets, the mesh sheet located in the center in the thickness direction of the three sheets has a relatively mesh pattern. The other two sheets (that is, the net sheet closest to the absorber 4 and the net sheet closest to the back sheet 3) are preferably relatively coarse. With such a configuration, the contact area between the absorber 4 and the spacer member 10 is reduced, and the contact area between the back sheet 3 and the spacer member 10 is also reduced, so that the effect of exuding body fluid from the back sheet 3 can be improved. In addition, the lowering of the air permeability (moisture permeability) of the back sheet 3 due to the arrangement of the spacer member 10 is more effectively prevented.

The area of one mesh in the "relatively meshes coarse mesh sheet", preferably 4 mm ² or more, more preferably 8 mm ² or more and, preferably 70 mm ² or less, more preferably 50 mm ² or less, more specifically Specifically, it is preferably 4 to 70 mm ² , more preferably 8 to 50 mm ² .
The area of one mesh in the “relatively fine mesh sheet” is preferably 0.4 mm ² or more, more preferably 1 mm ² or more, and preferably 50 mm ² or less, more preferably 40 mm ² or less. More specifically, it is preferably 0.4 to 50 mm ² , more preferably 1 to 40 mm ² .

  The back sheet 3 and the spacer member 10 (mesh sheet 12) are joined via an adhesive (not shown) partially applied to the skin facing surface of the back sheet 3 (the surface facing the spacer member 10). ing. That is, no adhesive is applied to the entire area of the skin facing surface of the back sheet 3, and there is a portion where no adhesive is applied to the skin facing surface. In the present embodiment, an adhesive is applied to the linear member 12B of the mesh sheet 12 that forms the non-skin facing surface of the spacer member 10, and the back surface sheet 3 is stacked on the adhesive application surface of the mesh sheet 12, Both members 10 and 3 are integrated through the adhesive. Therefore, the application part of the adhesive on the skin facing surface of the back sheet 3 matches the mesh pattern of the mesh sheet 12 in contact with the skin facing surface. Thus, the air permeability (moisture permeability) of the back sheet 3 is hindered by the partial application of the adhesive to one surface (skin facing surface) of the back sheet 3 (not the entire surface). It is hard to be done, and practically sufficient air permeability (moisture permeability) can be secured. In addition, between the absorber 4 (absorbent sheet 401) and the spacer member 10 (net-like sheet 11), it may be joined via the adhesive similarly to between the back surface sheet 3 and the spacer member 10. .

  In addition, the plurality of mesh sheets 11 and 12 constituting the spacer member 10 (laminated structure) have a disadvantage that the structure of the spacer member 10 collapses due to the mesh sheets 11 and 12 being laminated while the napkin 1 is worn. From the viewpoint of prevention, it is preferable that they are joined together. The reticulated sheets 11 and 12 can be joined to each other via an adhesive. When the reticulated sheets 11 and 12 are made of a heat-fusible material, both the sheets 11 and 12 are not involved without the adhesive. The net-like sheets 11 and 12 can be joined by fusing only by pressurizing and heating.

When the forming material of each part in the napkin 1 is demonstrated, as the surface sheet 2, the liquid-permeable surface sheet conventionally used in this kind of absorbent article can be used, for example, the nonwoven fabric manufactured by the card | curd method And various nonwoven fabrics such as air-through nonwoven fabric, spunbonded nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric, and needle punched nonwoven fabric; and films made liquid-permeable by opening means. These nonwoven fabrics and films may be subjected to a hydrophilic treatment using a hydrophilic agent such as a surfactant. The basis weight of the surface sheet 2 is preferably 15 g / m ² or more, more preferably 30 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, and more specifically, Preferably it is 30-80 g / m < ² >, More preferably, it is 15-100 g / m < ² >.

  Moreover, although not shown in figure, the skin opposing surface side of the surface sheet 2 may comprise the uneven | corrugated shape which has many convex parts and recessed parts. With such a configuration, the dry feeling of the skin facing surface of the napkin 1 is improved. The concave portions constituting the concave and convex shape of the topsheet can be formed by embossing such as hot embossing and ultrasonic embossing, and the convex portions constituting the concave and convex shape are located between the plurality of concave portions. The convex portion constituting the uneven shape of the topsheet 2 may be a solid structure filled with constituent fibers inside, or may be a hollow structure with a space portion formed inside.

Moreover, the back surface sheet 3 has moisture permeability. When the back surface sheet 3 has moisture permeability, the humidity in the wearing when the napkin 1 is worn is lowered, and stuffiness can be prevented. Here, the “moisture permeability” is a property of diffusing water vapor from the high humidity side to the low humidity side according to the second law of thermodynamics without airflow movement as in the concept disclosed in JIS Z0208 or ASTM E398. It is a property expressed in a porous film having a very small opening (moisture permeable film) or a non-porous film highly compatible with water. As the back sheet 3 having moisture permeability, for example, a moisture-permeable film alone, a laminate of a moisture-permeable film and a nonwoven fabric, a water-repellent nonwoven fabric, or the like can be used. From the viewpoint of ensuring the effect of the moisture-permeable back sheet 3 more reliably, the back sheet 3 preferably further has air permeability in addition to moisture permeability. Here, “breathability” is literally a property of breathing and is typically a property of airflow passing through like various fabrics. The basis weight of the backsheet 3 is preferably 15 g / m ² or more, more preferably 25 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, and more specifically, Preferably it is 15-100 g / m < ² >, More preferably, it is 25-80 g / m < ² >.

  The absorbent body 4 is not a laminated body obtained by stacking fiber materials such as wood pulp from the viewpoint of thinning and low rigidity of the napkin 1, but is thinner and less rigid than the stacked fiber body. It is desirable to use an absorbent sheet. In particular, when the absorbent body 4 is configured to include an absorbent sheet, since the compressive deformation is small as compared to the case where the absorbent body 4 is configured to include the fiber stack, the mesh sheet 11 ( The absorbent body 4 is unlikely to enter the mesh 11A of the mesh sheet of the mesh sheet closest to the absorbent body 4 (the projecting length T2 of the projecting portion of the absorbent body 4 (see FIG. 4) is small), and the body fluid from the back sheet 3 side Oozing out is more effectively prevented.

  In the napkin 1 according to the present embodiment, the absorbent sheets 401 and 402 are formed between the constituent fibers and the constituent fibers via a binder such as an adhesive force or an adhesive fiber added separately in the wet water-absorbing polymer. It is preferable to use a sheet formed by bonding between the water-absorbing polymer and the water-absorbing polymer. Further, as the absorbent sheet, an absorbent sheet manufactured by the method described in JP-A-8-246395, pulverized pulp supplied in an air stream and a water-absorbing polymer are deposited, and then an adhesive (for example, acetic acid) is used. Dry sheets hardened with vinyl adhesives, PVA, etc.) Absorbent sheets obtained by applying a hot-melt adhesive between paper and non-woven fabric and then spraying a superabsorbent polymer, spunbond or melt blown non-woven fabric An absorbent sheet or the like obtained by blending a superabsorbent polymer during the production process can be used. As a suitable absorbent sheet, a water absorbent polymer is fixed to an aggregate of pulp fibers, a dry pulp sheet produced by an airlaid method, and a particulate water absorbent polymer is dispersed between two nonwoven fabrics. Things. These absorptive sheets can be used as a sheet-like absorber by cutting one sheet into a predetermined shape. The thickness per sheet of the absorbent sheet is preferably 0.1 mm or more, particularly 0.3 mm or more, and preferably 2 mm or less, particularly 1.5 mm or less. More specifically, it is preferably 0.1 mm or more and 2 mm or less, particularly preferably 0.3 mm or more and 1.5 mm or less.

  However, as the absorbent body 4, a pile-type absorbent body may be used instead of the above-described absorbent sheet. As an example of the stacked fiber type absorbent body, there is a laminated structure formed by stacking a plurality (2) of stacked fiber type absorbent bodies. The laminated structure of such a stacked fiber type absorber has, for example, a substantially rectangular shape with rounded corners in a plan view, and extends from the front part A through the excretory part facing part B to the rear part C, Body (absorber having the same shape in plan view as the main absorbent body 40), and the skin-facing surface of the central portion in the lateral direction Y of the lower-layer absorbent body in the excretory part-facing part B that is narrower than the lower-layer absorbent body An upper-layer absorber (an absorber having the same shape as that of the auxiliary absorber 41 in plan view) is disposed on the side, and a laminated body of both absorbers forms the middle-high portion 42. Various materials conventionally used in the technical field can be used without particular limitation as the material constituting the pile-type absorber, for example, a fiber assembly made of hydrophilic fibers such as wood pulp and synthetic fibers A body or a fiber aggregate in which a particulate water-absorbing polymer is held can be used.

  Further, the absorbent body 4 includes an absorbent core made of an absorbent sheet or a stacked fiber type absorbent body in any of the forms including the absorbent sheet as shown in FIG. 2 or the above-described stacked fiber type absorbent body, You may comprise including the liquid-permeable core wrap sheet | seat which coat | covers an absorptive core. In that case, the absorbent core and the core wrap sheet may be joined to each other by a joining means such as a hot-melt pressure-sensitive adhesive at a predetermined site. As a core wrap sheet which coat | covers an absorptive core, liquid permeable sheets, such as paper, such as tissue paper, various nonwoven fabrics, and an apertured film, can be used, for example. When the absorbent body 4 is configured to include an absorbent core and a core wrap sheet that covers the absorbent core, compression deformation is reduced as compared with the case where the absorbent body 4 is configured by only the absorbent core. The absorber 4 is less likely to enter the mesh 11A of the mesh sheet 11 (the mesh sheet closest to the absorber 4) to be configured (the protruding length T2 of the absorber 4 (see FIG. 4) is small), and the back sheet 3 side Bleeding of body fluid from the water is further effectively prevented.

  As the side sheet 8, various types conventionally used in the technical field can be used without particular limitation. For example, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. Can be used. Other materials include, for example, spunbond nonwoven fabrics, composite sheets of spunbond nonwoven fabric (S) and meltblown nonwoven fabric (M) (for example, SM, SMS, SMMS, etc.), heat roll nonwoven fabrics, air-through nonwoven fabrics and the like. An aqueous (hydrophobic) non-woven fabric may be mentioned.

As the material of the net-like sheets 11 and 12 constituting the spacer member 10, a water-repellent material, that is, a material that does not absorb and hold liquid can be used, and examples thereof include resins such as polyethylene, polystyrene, polyethylene terephthalate, and polyester. . The basis weight of the net-like sheets 11 and 12, respectively, preferably 15 g / m ² or more, more preferably 20 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, more specifically Specifically, it is preferably 15 to 100 g / m ² , more preferably 20 to 80 g / ² . The basis weights (thicknesses) of the mesh sheets 11 and 12 may be the same as or different from each other.

  In addition, what can be used as the mesh sheets 11 and 12 is a mesh sheet in which many meshes are regularly formed, and the mesh sheet in which the meshes are irregularly formed is not used in the present invention. Therefore, for example, a sheet (fiber assembly) including fiber gaps between constituent fibers, such as ordinary paper and nonwoven fabric, is not a mesh sheet according to the present invention.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the said embodiment, although the spacer member 10 was distribute | arranged over the whole region of the non-skin opposing surface of the absorber 4 (main absorber 40), it should just be distribute | arranged to the excretion part opposing part B at least. The front part A and / or the rear part C may not be arranged. Further, the spacer member 10 may extend outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorber 4. Moreover, in the said embodiment, although the mesh sheet of the several sheets which comprise the laminated structure which a spacer member has was the same as each other, you may mutually differ. The planar shape of the mesh of the mesh sheet is not limited to a square shape, and can be arbitrarily set to a rectangular shape, a circular shape, a triangular shape, a hexagonal shape, a combination shape of different polygons, and the like.

  The napkin 1 may not have the wing part 7. In addition to sanitary napkins, the absorbent article of the present invention can also be applied to panty liners (orimono sheets), incontinence pads, disposable diapers and the like. The following additional notes are disclosed with respect to the embodiment of the present invention described above.

1,1A Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 40 Main absorber 41 Auxiliary absorber 401, 402 Absorbent sheet 42 Middle-high part 5 Absorbent body 7 Wing part 10 Spacer member 11, 12 Mesh sheet 11A, 12A Mesh 11B, 12B Linear Member A Front part B Excretion part opposing part C Rear part X Longitudinal direction Y Lateral direction

Claims (6)

An absorbent article comprising an absorbent body and a moisture-permeable back sheet disposed on the non-skin-facing surface side of the absorbent body, and having an excretion part facing part that is disposed to face the wearer's excretion part when worn. ,
Between the absorbent body and the back sheet in the excretory part facing portion, a spacer member is interposed to separate the absorber and the back sheet in their thickness direction,
The spacer member has a laminated structure formed by laminating a plurality of water-repellent mesh sheets in which a large number of meshes are regularly formed, and in the laminated structure, two mesh sheets adjacent in the thickness direction are disposed between each other. Is an absorbent article that is shifted so that their meshes do not match.   The mesh sheet closest to the absorber among the plurality of mesh sheets constituting the laminated structure has a relatively coarse mesh, and the mesh sheet closest to the back sheet has a relatively fine mesh. The absorbent article as described.   The laminated structure is formed by laminating three mesh sheets, of which the mesh sheet located in the center in the thickness direction has a relatively fine mesh, and the other two sheets have a relatively coarse mesh. Item 10. An absorbent article according to Item 1.   The plurality of mesh sheets constituting the laminated structure have the same mesh pattern, and the two mesh sheets adjacent to each other in the thickness direction have one mesh in each of the one direction and the direction perpendicular thereto. The absorptive article according to any one of claims 1 to 3 arrange | positioned by the half length of the said direction.   The absorbent article according to any one of claims 1 to 4, wherein the absorbent body includes an absorbent sheet.   The absorptive article according to any one of claims 1 to 5 in which said back sheet and said spacer member are joined via the adhesive partially applied to the skin opposed side of said back sheet.

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