TW202128102A - Absorbent article - Google Patents

Abstract

In the present invention, a surface sheet (3) comprises, on a skin-facing side, a plurality of: linear first recessed sections (30) that extend in one direction; linear second recessed sections (31) that extend in a direction that intersects the one direction; and protruding sections (33) bounded by the recessed sections (30, 31). The recessed sections (30, 31), when considered as continuous lines, are segmented in the direction of extension by including discontinuity sections (32) at virtual intersections where the recessed sections (30) and the recessed sections (31) intersect, and a plurality of protruding sections (33) are connected to each other via the discontinuity sections (32). An absorbent core (6) includes deformation-inducing sections (60X, 60Y) that are each disposed so as to correspond to a single virtual line (L1x, L1y) extending in one direction through a plurality of discontinuity sections (32).

Description

Absorbent articles

The present invention relates to an absorbent article such as a menstrual sanitary napkin.

An absorbent article usually includes an absorbent body and a front sheet arranged on the wearer's skin side more than the absorbent body. Previously, there is known a technique of imparting uneven shapes to the skin facing surface of the front sheet by compression processing such as embossing processing. In addition, there is known a technique in which an absorbent body is provided with a groove-shaped concave portion extending in one direction as a deformation inducing portion that serves as a starting point of deformation of the absorbent body. Patent Documents 1 to 3 disclose absorbent articles using these two technologies. Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2012-239721 Patent Document 2: Japanese Patent Laid-Open No. 2015-100574 Patent Document 3: Japanese Patent Laid-Open No. 2018-202220

The present invention is an absorbent article comprising: an absorbent body having a longitudinal direction corresponding to the front and back directions of the wearer and a transverse direction orthogonal to the longitudinal direction, and including an absorbent core that absorbs and retains body fluids; and a front sheet, It is arranged on the skin facing side of the absorbent body. In an embodiment of the absorbent article of the present invention, the surface sheet and the absorbent body are partially joined by an adhesive. In an embodiment of the absorbent article of the present invention, the surface sheet has a plurality of linear first recesses extending in one direction on the skin-facing surface of the surface sheet, respectively, in a direction intersecting the one direction The linear second concave portion extending upward, the intersection of the two concave portions, and the convex portion surrounded by the two concave portions. In an embodiment of the absorbent article of the present invention, when the first recessed portion and the second recessed portion are respectively regarded as continuous lines, there is a discontinuous portion at the imaginary intersection point where the first recessed portion and the second recessed portion intersect. It is divided in the extending direction, and a plurality of the above-mentioned convex portions are connected to each other via the discontinuous portion. In one embodiment of the absorbent article of the present invention, the absorbent core has a deformation inducing portion that is arranged corresponding to a virtual line extending in one direction through a plurality of the discontinuous portions. The other features, effects, and embodiments of the present invention will be described below.

Regarding absorbent articles such as menstrual sanitary napkins, it is desirable that they have good conformability and adhere to the wearer's body without gaps. In order to meet this expectation, most of the previous product designs are designed to make the absorbent article easily deformable to fill the gap between it and the body. However, the actual situation is that most of this product design focuses on the absorber, and almost no product design that also focuses on other components than the absorber has been found.

Generally speaking, in absorbent articles, the front sheet and the absorber are joined directly or indirectly via other members by an adhesive. The so-called full coating), the adhesive will hinder the penetration of liquid from the front sheet to the absorber, which may reduce the liquid absorption and leakage resistance. Therefore, the adhesive is usually used to partially separate the front sheet and the absorber. Splice. In an absorbent article with such a common structure, when an absorbent body that is easily deformed during wearing and a relatively large amount of deformation is used in order to achieve the purpose of improving conformability, etc., the deformation of the absorbent body is large, so sometimes the front sheet Will bulge from the absorber.

The inventors have conducted various studies, and as a result, they have clarified the following situation: in the case where linear recesses are particularly provided to the front sheet by compression processing, the body pressure of the wearer of the absorbent article is applied to the front sheet. When an external force is applied, the concave portion functions as a deformation inducing portion (flexible shaft) of the front sheet. The vector of the deformation direction of the concave portion and the vector of the deformation direction of the absorber are combined to make the front sheet easy to wrinkle. Therefore, the surface sheet easily swells from the surface of the absorbent body. Such "uplift of the front sheet" may cause excretion to stay on the front side of the front sheet (the opposite side of the skin), increasing the risk of inducing leakage, and it is hoped to prevent it from occurring.

Therefore, the present invention relates to an absorbent article that is excellent in conformability to the wearer's body, the front sheet is difficult to swell, and is excellent in leakage resistance.

Hereinafter, based on the preferred embodiments of the present invention, the present invention will be described with reference to the accompanying drawings. In addition, in the description of the following drawings, the same or similar parts are denoted by the same or similar symbols. The drawings are basically schematic diagrams, and the ratios of each dimension may be different from the actual product.

The absorbent article of the present invention has a longitudinal direction corresponding to the front and back direction of the wearer, that is, the direction extending from the abdomen side through the crotch to the back side (the direction shown by the symbol "X" in the figure), and a direction orthogonal to the longitudinal direction. Horizontal (the direction indicated by the symbol "Y" in the figure). In the following description, unless otherwise specified, the longitudinal direction is along the longitudinal direction of the absorbent article or its constituent members (for example, absorbent body), and the lateral direction is along the transverse direction of the absorbent article or its constituent members. The horizontal direction. The absorbent article of the present invention includes: an absorber (a member shown by the symbol "5" in the figure), which includes an absorbent core (a member shown by the symbol "6" in the figure) that absorbs and retains body fluids; and a front sheet (The member shown by the symbol "3" in the figure), which is arranged on the skin facing side of the absorbent body. Fig. 1 and Fig. 2 show a menstrual sanitary napkin 1 as an embodiment of the absorbent article of the present invention, and the sanitary napkin 1 has the above-mentioned structure.

In this specification, the "skin facing surface" refers to the surface of the absorbent article or its constituent members (for example, absorbent body 5) that faces the wearer's skin side when the absorbent article is worn, that is, the side relatively close to the wearer's skin. The "non-skin facing surface" refers to the surface of the absorbent article or its constituent members that faces the side opposite to the skin side when the absorbent article is worn, that is, the side relatively far from the wearer's skin. Furthermore, the "while wearing" mentioned here means the state of maintaining the normally appropriate wearing position, that is, the correct wearing position of the absorbent article.

The sanitary napkin 1 is an article used to absorb body fluids such as menstrual blood excreted by the wearer. It includes: an absorbent body 5, which includes an absorbent core 6; a liquid-permeable front sheet 3, which is arranged on the skin of the absorbent body 5 The opposite side, which can be in contact with the wearer’s skin; and the back sheet 4 of liquid impermeability or liquid impermeability or water repellency (leakproof in general), which is arranged on the non-skin side of the absorbent body 5 To the face side. The sanitary napkin 1 is divided into the following three areas, namely: the longitudinal central area M, which is arranged in the crotch of the wearer, and includes the excretion part facing part (not shown) that faces the excretion part such as the vaginal opening of the wearer ); The front area F, which is arranged on the wearer's front side (abdomen side) than the longitudinal central area M; and the rear area R, which is arranged on the wearer’s back side (back side) than the longitudinal central area M .

In this embodiment, as shown in FIG. 1, the sanitary napkin 1 has: an absorbent body 2 having a long shape in the longitudinal direction X; and a pair of wings 2W and 2W, which are derived from the absorbent body 2 Both sides of the longitudinal center region M along the longitudinal direction X respectively extend to the outer side of the lateral direction Y. The absorbent body 2 is the part that forms the main body of the sanitary napkin 1. It is provided with the above-mentioned front sheet 3, back sheet 4, and absorbent body 5. Rear area R. Each of the top sheet 3 and the back sheet 4 and the absorber 5 are joined by an adhesive.

Furthermore, in the present invention, when an absorbent article like the sanitary napkin 1 has wings, the longitudinal center area of the absorbent article corresponds to the longitudinal direction (the length direction, the X direction in the figure) of the absorbent article. The area of the wing. Taking the sanitary napkin 1 as an example, the area sandwiched between the root of one wing 2W in the longitudinal direction X and the root of the other wing 2W in the longitudinal direction X is the longitudinal central area. In the sanitary napkin 1, a pair of wings 2W and 2W are symmetrically formed on the basis of the transverse center line CLy that halves the sanitary napkin 1 in the transverse direction Y and extends along the longitudinal direction X. The root on one side and the root on the side of the other wing portion 2W close to the front area F are at the same position in the longitudinal direction X. Furthermore, in the present invention, the longitudinal center region of an absorbent article without wings (for example, a typical disposable diaper) corresponds to a region in the middle when the absorbent article is divided into three in the longitudinal direction.

In this embodiment, the absorbent body 5 is composed of an absorbent core 6 and a liquid-permeable core covering material 7. The absorbent core 6 has liquid absorbability and absorbs and retains body fluids such as menstrual blood. The core covering material 7 is coated The absorbent core 6 has an outer surface. The absorptive core 6 is the same as the absorptive main body 2 and has a shape elongated in the longitudinal direction X. As shown in FIG. The length direction of the absorbent core 6 is consistent with the longitudinal direction X of the sanitary napkin 1, and the width direction of the absorbent core 6 is consistent with the transverse direction Y of the sanitary napkin 1. As shown in FIG. 1, the absorbent body 5 (absorbent core 6) is continuous across substantially the entire length of the longitudinal direction X of the sanitary napkin 1 (absorbent body 2), and extends from the front region F to the rear region R through the longitudinal center region M. The absorptive core 6 and the core covering sheet 7 may be joined by an adhesive such as a hot melt adhesive.

Regarding the core-coated sheet 7, 1) may be composed of only one sheet, and 2) may be composed of a plurality of sheets. The core-covering material 7 of 1) above is, for example, a continuous sheet having a width of two to three times the length of the transverse direction Y of the absorbent core 6, covering the entire skin-facing surface of the absorbent core 6, and And extend from the both side edges of the absorbent core 6 in the longitudinal direction X to the outer side of the transverse direction Y, and the extended portion is rolled down below the absorbent core 6 to cover the non-skin of the absorbent core 6 Opposite the whole area. The core covering material 7 of the above 2) is, for example, a skin-side core covering material covering the skin facing surface of the absorbent core 6 and a non-skin covering the absorbent core 6 separately from the skin-side covering core material One sheet of the non-skin side of the opposing surface is composed of two sheets of core material.

In this embodiment, as shown in FIG. 2, the surface sheet 3 covers the entire skin-facing surface of the absorber 5. On the other hand, the back sheet 4 covers the entire non-skin facing surface of the absorbent body 5, and then extends from both sides of the absorbent body 5 in the longitudinal direction X to the outside of the transverse direction Y, together with the following side sheet 8 The side wing part 2S is formed. The side flap 2S is a part of the sanitary napkin 1 made up of a member extending from the absorbent body 5 (absorbent main body 2) to the outer side of the transverse direction Y. The back sheet 4 and the side sheet 8 are joined to each other by a known joining method, such as an adhesive, heat sealing, and ultrasonic sealing, at the extension part of the absorber 5 from both side edges along the longitudinal direction X. In the form shown in the figure, the junction 81 of the back sheet 4 and the side sheet 8 has a ring shape in a plan view, and surrounds the absorber 5.

As shown in FIG. 1, the side flaps 2S protrude largely toward the outer side of the transverse direction Y in the longitudinal central region M, whereby a pair of flaps 2W and 2W are extended on the left and right sides of the absorptive main body 2 in the longitudinal direction X. In a plan view, the wing portion 2W has a substantially trapezoidal shape with a lower bottom (longer side than the upper bottom) located on the side of the absorbent body 2, and is provided on its non-skin facing surface to fix the wing portion 2W to The wing adhesive part (not shown) of the fixing mechanism of underwear and other clothes. Furthermore, the wings 2W are used because they are folded back toward the non-skin-facing surface (outer surface) of the crotch of clothing such as underwear, so the non-skin-facing surface of the wings 2W, which is the forming surface of the wing adhesive portion, is on it When used, it faces the wearer's skin side and becomes the opposite side of the skin. In addition, the non-skin facing surface of the absorbent main body 2, that is, the non-skin facing surface of the back sheet 4, is provided with a main body adhesive portion as a fixing mechanism for fixing the sanitary napkin 1 (absorbent main body 2) to clothing such as underwear (Not shown). The wing part adhesive part and the main body adhesive part are respectively covered with a release sheet (not shown) made of film, non-woven fabric, paper, etc. before use.

In this embodiment, the two sides along the longitudinal direction X of the skin facing surface of the absorbent body 2 (the skin facing surface of the front sheet 3) are aligned with the left and right sides of the absorbent body 5 along the longitudinal direction X in a plan view. In the manner of overlapping the side portions, a pair of side sheets 8 and 8 are arranged across substantially the entire length of the longitudinal direction X of the absorbent main body 2. The pair of side sheets 8 and 8 are respectively joined to other members such as the surface sheet 3 and the like by a known joining method such as an adhesive at a linear joining portion not shown in the figure extending in the longitudinal direction X.

In this embodiment, as shown in FIGS. 1 and 2, the absorbent main body 2 is formed with a front depression 9 which is the skin facing side of the front sheet 3 and the absorbent body 5 (core-coated material The part of 7 covering the skin-facing surface of the absorbent core 6 and the absorbent core 6) are integrally recessed toward the non-skin-facing surface side of the absorbent body 5 (the back sheet 4 side). The front depression 9 does not penetrate the absorber 5 (absorbent core 6) in the thickness direction, and has an opening on the skin-facing surface of the front sheet 3, and has a bottom on the side opposite to the opening. The front depression 9 has a closed ring shape in a plan view, more specifically, has an oblong shape that is longer in the longitudinal direction X, and is formed at least in the longitudinal center region M. The front recessed portion 9 has a function of obstructing the movement of excretion fluid such as menstrual blood in the surface direction. The front depressed portion 9 is formed by compressing the sanitary napkin 1 (absorbent main body 2) from its skin facing side (the front sheet 3 side), and can be called a "compressed portion" depending on the method of forming it. The density of the front recessed portion 9 as the compressed portion is higher than that of the peripheral portion. Therefore, in the absorbent body 2 provided with the front depressed portion 9 as a compressed portion, the high-density portion corresponding to the front depressed portion 9 and the low-density portion where the front depressed portion 9 is not formed coexist, so a density difference occurs in the surface direction .

As the above-mentioned each member constituting the sanitary napkin 1, it is possible to use what is usually used in such absorbent articles without any particular limitation on the premise that the member is described below. As the front sheet 3, for example, a liquid-permeable single-layer or multi-layer non-woven fabric can be used. As the non-woven fabric, non-woven fabrics (for example, hot-air non-woven fabrics) produced by the carding method, spun-bonded non-woven fabrics, melt-blown non-woven fabrics, and water can be exemplified. Punched non-woven fabrics, needle-punched non-woven fabrics. The non-woven fabric constituting the surface sheet 3 may be subjected to a hydrophilization treatment using a hydrophilizing agent such as a surfactant. As the back sheet 4, a leak-proof sheet can be used, that is, it has liquid impermeability (the property of completely impervious to liquid) or liquid impermeability (although it does not reach the level of liquid impermeability, it is difficult to make liquids. The sheet material of the passing property) includes, for example, a moisture-permeable resin film.

As the absorbent core 6, for example, a fiber assembly mainly composed of fibers (water-absorbing fibers) such as wood pulp, or a fiber assembly containing a particulate water-absorbing polymer can be cited. The absorbent core 6 mainly composed of such a fiber assembly can be manufactured according to a conventional method using a known fiber stacking device equipped with a rotating drum, and can be called a "fiber stacking absorbent core" according to the manufacturing method. As the absorbent core 6, a "sheet-shaped absorbent core" may be used instead of the fiber-stacked absorbent core, or a "sheet-shaped absorbent core" may be used in addition to the fiber-stacked absorbent core. As the sheet-shaped absorbent core, for example, a fiber sheet facing each other and a water-absorbent polymer arranged between the two fiber sheets can be exemplified. In this embodiment, the absorbent core 6 is a fiber accumulation type absorbent core. As the core-coating material 7, a liquid-permeable sheet can be used, typically non-woven fabric or paper. As the side sheet 8, a water-repellent or water-repellent non-woven fabric can be used.

The surface sheet 3 and the absorber 5 are locally joined by an adhesive. That is, on the facing surface of the front sheet 3 and the absorber 5 (the non-skin facing surface of the front sheet 3) and/or the facing surface of the absorber 5 and the front sheet 3 (the skin of the absorber 5) Opposite surface), the adhesive is intermittently coated in such a way that the coated part and the non-coated part of the adhesive are mixed. By partially joining the front sheet 3 and the absorber 5 with an adhesive, it is easy to obtain good liquid permeability.

The application form of the adhesive to which the top sheet 3 and the absorber 5 are partially joined is not particularly limited. For example, the plan view shape of the adhesive application part is spiral, peak, Ω, curtain, stripe, etc. The coating form. More specifically, for example, a form in which the adhesive application part having a plan view shape of one or more of the above-mentioned shapes extends in one direction (for example, the longitudinal direction X) between the surface sheet 3 and the absorber 5 can be cited. As an adhesive agent, the adhesive agent which can be used for joining members in such an absorbent article can be used without a restriction|limiting, For example, a hot melt adhesive agent can be mentioned. The coating amount (basis weight) of the adhesive may be appropriately adjusted according to the types of the top sheet 3 and the absorber 5, etc.

Furthermore, the "front sheet" mentioned in the present invention is a sheet-like member arranged on the skin-facing side of the absorber. It may have a single-layer structure or a laminate of two or more sheet-like members. The multi-layer structure. In the above-mentioned laminated structure, a plurality of sheet-like members may or may not be joined to each other. For example, in this kind of absorbent article, there was previously a liquid permeability between the front sheet (the sheet closest to the wearer’s skin) and the absorbent, which is called the secondary layer or the second sheet. In the case of the intermediate sheet, the absorbent article of the present invention includes a form including the intermediate sheet, and in the present invention, the intermediate sheet is treated as a part of the top sheet. That is, in the present invention, the above-mentioned intermediate sheet is treated as the "non-skin facing surface side of the top sheet". The following first recessed portion, second recessed portion, and convex portion are formed on the skin-facing surface side of the front sheet, and are not formed on the above-mentioned intermediate sheet. However, it is also possible to form a plurality of recesses that are separate from the first recesses and the second recesses of the front sheet on the intermediate sheet.

In the sanitary napkin 1, the absorbent body 5, which is a particularly rigid member of the sanitary napkin 1, and more specifically, the absorbent core 6 that forms the main body of the absorbent body 5, is provided with a deformation inducing portion to apply to the absorbent body 5. The sanitary napkin 1 can be flexibly deformed under external forces such as the body pressure of the wearer. By appropriately providing the deformation inducing portion in the absorbent core 6, the sanitary napkin 1 is easily deformed by filling the gap between the sanitary napkin 1 and the wearer's body when it is worn.

In this embodiment, as shown in FIG. 3, the deformation inducing portion is a groove-shaped recess 60 that has an opening and extends in a specific direction on at least one of the skin-facing surface 6a and the non-skin-facing surface 6b of the absorbent core 6. .

The groove-shaped recessed portion 60 (deformation inducing portion) may be a non-penetrating type that does not penetrate the absorbent core 6 in the thickness direction, or a penetration type that penetrates the absorbent core 6 in the thickness direction. The entire groove-shaped recess 60 of the through type is a space portion, which is a so-called through hole. In this embodiment, the groove-shaped recessed portion 60 is a non-penetrating type as shown in FIGS. 2 and 3(b). It has an opening on the skin-facing surface 6a of the absorbent core 6 and a bottom on the side opposite to the opening. . The bottom of the non-penetrating groove-shaped recess 60 is a portion overlapping with the groove-shaped recess 60 in a plan view of the absorbent core 6 (a projection observation in the thickness direction of the absorbent core 6), and includes a core forming material. Furthermore, in the present invention, the non-penetrating groove-shaped recess 60 may have an opening on the non-skin facing surface 6b of the absorbent core 6 and a bottom on the side opposite to the opening, which is opposite to the shape shown in the figure.

In this embodiment, as shown in FIG. 3, the groove-shaped recess 60 has a longitudinal recess 60X extending in the longitudinal direction X and a lateral recess 60Y extending in a direction intersecting the longitudinal recess 60X. The absorbent core 6 is formed The surface side with the opening of the longitudinal recess 60X and the opening of the lateral recess 60Y is divided into a plurality of small absorption portions 61. More specifically, in this embodiment, in the absorbent core 6, a plurality of longitudinal recesses 60X are intermittently arranged in the transverse direction Y, and a plurality of transverse recesses 60Y are intermittently arranged in the longitudinal direction X, and a plurality of longitudinal depressions 60X are intermittently arranged in the longitudinal direction X. It is orthogonal to a plurality of lateral recesses 60Y. A plurality of longitudinal recesses 60X are continuous from one end of the longitudinal direction X of the absorbent core 6 and the other end, and a plurality of transverse recesses 60Y are continuous from one end of the absorbent core 6 in the transverse direction Y and the other end respectively. In addition, all the groove-shaped recesses 60 (vertical recesses 60X, lateral recesses 60Y) formed in the absorbent core 6 have openings on the skin-facing surface 6a of the absorbent core 6. That is, in the absorbent core 6, the skin facing surface 6a side is divided into a plurality of small absorption portions 61 by a plurality of vertical concave portions 60X and a horizontal concave portion 60Y orthogonal to each other, and each small absorption portion 61 is shown in Fig. 3(a ) Shows a quadrilateral shape in plan view.

In this embodiment, since the groove-shaped recess 60 is a non-penetrating type, the continuous layer 62 without the groove-shaped recess 60 spans the entire surface direction (the direction orthogonal to the thickness direction) of the area where the groove-shaped recess 60 exists. One surface side of the area where the groove-shaped recessed portion 60 exists in the absorbent core 6 (in this embodiment, the entire absorbent core 6). The portion of the continuous layer 62 that overlaps the groove-shaped recess 60 in the plan view (the projection observation in the thickness direction of the absorber 5) constitutes the bottom of the non-penetrating groove-shaped recess 60. The plurality of small absorption parts 61 are integrated via the continuous layer 62. In this embodiment, as shown in FIG. 2, the continuous layer 62 is biased toward the non-skin facing surface 6 b side of the absorbent core 6. The non-skin facing surface 6b of the absorbent core 6 is a flat surface that is formed by a continuous layer 62 and is substantially free of unevenness. In contrast, the skin facing surface 6a has recesses and small portions formed by the openings of the groove-shaped recesses 60 The concave-convex shape formed by the convex portion formed by the absorbing portion 61 is a concave-convex surface.

Furthermore, in the present invention, as described above, the through-type groove-shaped recess 60 is included as the groove-shaped recess 60 (deformation inducing portion). In this case, the through-type groove-shaped recess 60 in the absorbent core 6 There is no continuous layer 62 in the existence area, and the plurality of small absorption parts 61 are not integrated, but can exist separately and independently. The plurality of small absorption parts 61 are respectively bonded to the core-coated sheet 7 by a bonding method such as an adhesive, thereby maintaining the specific arrangement of the plurality of small absorption parts 61.

In this embodiment, as shown in FIG. 3, the groove-shaped recessed part 60 is provided in the whole absorptive core 6, but it may be provided only in a part of the absorptive core 6. As shown in FIG. In this case, for example, the groove-shaped recesses 60 may be provided in any one or two of the front area F, the longitudinal center area M, and the rear area R. In addition, in the absorbent core 6, the number of groove-shaped recesses 60 may be one, and preferably two or more. Moreover, a through-type groove-shaped recessed part and a non-through-type groove-shaped recessed part may be mixed in the absorptive core 6 as the groove-shaped recessed part 60, but typically only one kind of groove-shaped recessed part 60 exists. In addition, the groove-shaped recessed portion 60 may not be linear in a plan view like the longitudinal recessed portion 60X and the lateral recessed portion 60Y, and may be partially or entirely curved.

In addition, the groove-shaped recess 60 extends in a specific direction. The "extension" mentioned here, as shown in FIG. In the case of the lateral recess 60Y, it is a continuous linear extension in the lateral direction Y), and includes the following cases: a plurality of groove-shaped recesses 60 are intermittently arranged in one direction, and the plurality of groove-shaped recesses 60 appear to be on one side as a whole. Extend upward. In the latter case, the distance between the two groove-shaped recesses 60 closest to each other in one direction is preferably 30 mm or less, and more preferably 20 mm or less. As a specific example of the latter case, the following form can be exemplified: a plurality of groove-shaped recesses 60 having a specific shape in plan view are intermittently arranged in the longitudinal direction X or the lateral direction Y, and the plurality of groove-shaped recesses 60 are arranged in the longitudinal direction X or the lateral direction Y. It extends in a dashed line.

The groove-shaped recessed portion 60 in the absorbent core 6 has no core-forming material or only a very small amount of the core-forming material, so it is easy to become a starting point for bending. Furthermore, the portion overlapping the groove-shaped recess 60 in a plan view (hereinafter also referred to as "the existing portion of the groove-shaped recess 60") is compared to the surrounding when the groove-shaped recess 60 is a non-penetrating type, and the core is formed The part with less material, when the groove-shaped recess 60 is a through type, is a space where there is no core-forming material. No matter which type of groove-shaped recess 60 is, its rigidity is higher than that of the non-existent groove-shaped recess 60 The portion (small absorption portion 61) is low, and therefore, when the sanitary napkin 1 is worn, it easily becomes a flexible shaft when the absorbent core 6 is bent, and can function as a deformation (bending) inducing portion. Therefore, when the absorbent body 5 (absorbent core 6) is worn on the sanitary napkin 1, the groove-shaped recessed portion 60 can be used as a deformation inducing portion to be deformed in accordance with the shape of the wearer's body. Therefore, the sanitary napkin 1 is excellent in conformability, can provide a good wearing feeling to the wearer, and can effectively inhibit the leakage of body fluids such as menstrual blood. In addition, in the absorbent core 6, the groove-shaped recessed portion 60 extends in the longitudinal direction X and the lateral direction Y, whereby compared with the case where the groove-shaped recessed portion 60 is not formed, the absorption time of body fluid can be shortened and the body fluid can face The diffusibility of the direction is improved, so that the liquid absorption of the sanitary napkin 1 is improved.

The absorbent core 6 having the groove-shaped recessed portion 60 can be manufactured in the same manner as the manufacturing method of the absorbent core of such an absorbent article using a known fiber stacking device. The fiber stacking device is typically the following device: a drum with a recessed portion for integration is provided on the outer peripheral surface, while rotating the bowl, while facing the outer peripheral surface, the core forming material is supplied in a scattered state. The bottom surface is sucked to make the core-forming material fiber pile up in the concave portion for the integrated body, and the fiber accumulation in the concave portion for the integrated body is sucked by the suction mechanism arranged opposite to the concave portion for the integrated body The self-integrated body is released from the concave part and transferred to the suction mechanism. In the fiber stacking device of this structure, a non-air-permeable member or a non-air-permeable member or the like is arranged on a part of the air-permeable bottom surface of the recessed part for integration, and by making a part of the bottom surface a non-air-permeable part or a non-air-permeable part, When the fibers of the core-forming material are piled up, the core-forming material is difficult for the fibers to accumulate in the non-air-permeable portion or the non-air-permeable portion. Few other parts. Therefore, by using such a fiber stacking device with a rotating drum with a part of the bottom surface of the recessed portion for integration as a non-permeable portion or a non-permeable portion, an absorbent core is manufactured according to a conventional method, and the non-permeable portion or the non-permeable portion The part corresponding to the sex part becomes the groove-shaped recess 60, and the part corresponding to the other part of the bottom surface becomes the small absorption part 61, and the absorbent core 6 with the groove-shaped recess 60 can be obtained.

In this way, in the absorbent core 6 formed by locally varying the suction force when the core-forming material is sucked into the recessed part for the integrated body, the fiber accumulation amount of the core-forming material is locally different. Specifically, The mass per unit area (basis weight) of the core-forming material of the existing part of the groove-shaped recess 60 (the part of the absorbent core 6 that overlaps the groove-shaped recess 60 in a plan view) is relatively small (including a basis weight of zero In the case), the non-existent portion of the groove-shaped recessed portion 60, that is, the small absorption portion 61 has a relatively large basis weight.

Regarding the groove-shaped recesses 60, in addition to the method of deliberately reducing the fiber accumulation amount of the core-forming material at the predetermined location of the groove-shaped recesses 60 in the absorbent core 6 as compared with the peripheral portion as described above, for example It can also be formed by manufacturing an absorbent core with a uniform fiber accumulation of the core forming material and performing compression processing such as embossing on the groove-shaped recess 60 in the absorbent core. The groove-shaped recess 60 formed by such compression processing becomes a high-density and high-rigidity region compared to the peripheral portion of the groove-shaped recess 60 in the absorbent core 6.

In order to more reliably exert the effect of the groove-shaped recessed portion 60 (deformation inducing portion) of the absorptive core 6, it is preferable to set the size of each part of the absorptive core 6 as follows. Regarding the length (width) of the groove-shaped recess 60 in the direction orthogonal to the longitudinal direction, for example, if it is the longitudinal recess 60X extending in the longitudinal direction X, the length (width) of the transverse direction Y is preferably 1 mm or more, more preferably It is 3 mm or more, more preferably 10 mm or less, more preferably 5 mm or less. Regarding the small absorbent portion 61, that is, the "area in the absorbent core 6 divided by intersecting (orthogonal) groove-shaped recesses 60X, 60Y" (the area surrounded by the groove-shaped recess 60 in the absorbent core 6 The area of) is preferably 25 mm ² or more, more preferably 50 mm ² or more, more preferably 1000 mm ² or less, more preferably 500 mm ² or less. The number of small absorption parts 61 per unit area of 2500 mm ² is preferably 2 or more, more preferably 5 or more, and more preferably 100 or less, and more preferably 50 or less. The basis weight of the small absorbent portion 61 (the basis weight of the portion of the absorbent core 6 that overlaps the small absorbent portion 61 in plan view) is greater than the surrounding "absorbent core 6 in plan view and groove-shaped recess 60 The basis weight of the "overlapping part" is the premise, preferably 150 g/m ² or more, more preferably 200 g/m ² or more, and more preferably 800 g/m ² or less, more preferably 750 g/m ² the following. The basis weight of the continuous layer 62 is preferably 30 g/m ² or more, more preferably 50 g/m ² or more, and more preferably 160 g/m ² or less, more preferably 150 g/m ² or less. 3(b), the depth D of the non-penetrating groove-shaped recess 60 relative to the thickness T of the absorbent core 6 is preferably 40% or more, more preferably 50% or more, and more preferably 98% or less , More preferably less than 80%.

Fig. 4 shows a part of the skin facing surface of the front sheet 3 forming the skin facing surface of the sanitary napkin 1. In the sanitary napkin 1, as shown in FIGS. 1 and 4, the front sheet 3 has a plurality of surfaces extending in one direction (hereinafter, also referred to as the "first direction") on the skin-facing surface of the front sheet 3 The linear first recess 30, the linear second recess 31 extending in the direction intersecting the one direction (hereinafter, also referred to as the "second direction"), and the protrusion surrounded by the two recesses 30, 31部33. That is, on the skin-facing surface of the front sheet 3, a plurality of first recesses 30 extending in the first direction are arranged in parallel with each other at specific intervals in the second direction, and a plurality of them extending in the second direction The two second recesses 31 are arranged in parallel with each other at a specific interval in the first direction, and the skin facing surface of the front sheet 3 is divided into a plurality of regions by the two recesses 30, 31 extending to cross each other. A convex portion 33 exists in each of these regions.

In this embodiment, the first direction (the extension direction of the first recess 30) and the second direction (the extension direction of the second recess 31) are directions that are not orthogonal to both the longitudinal direction X and the lateral direction Y but intersect. However, in the present invention, one of the first direction and the second direction may be consistent with the vertical direction X, and the other may be consistent with the horizontal direction Y. That is, in the present invention, the first recess 30 and the second recess 31 may extend in the longitudinal direction X or the lateral direction Y, respectively. In addition, in this embodiment, the first recessed portion 30 and the second recessed portion 31 are straight lines (more specifically, discontinuous straight lines) in a plan view, but may also include curved lines.

The crossing angle θ1 (refer to FIG. 4) between the first recessed portion 30 and the lateral imaginary straight line VLy extending in the lateral direction Y through the first recessed portion 30 is preferably 45 degrees or more, more preferably 55 degrees or more. The crossing angle θ1 can also be 90 degrees, that is, the first recess 30 can also extend parallel to the longitudinal direction X. However, in order to maintain the distance between the first recess 30 and the second recess 31 appropriately, the liquid permeability and the generation of wrinkles can be further suppressed. It is preferably 75 degrees or less, and more preferably 65 degrees or less. The crossing angle θ1 mentioned here refers to the crossing angle of the acute angle and the obtuse angle generated by the intersection of the first recess 30 and the transverse imaginary straight line VLy. The crossing angle θ2 (refer to FIG. 4) between the second recessed portion 31 and the lateral virtual straight line VLy extending in the lateral direction Y through the second recessed portion 31 is also the same as the crossing angle θ1. The preferred ranges of the above-mentioned crossing angles θ1 and θ2 may satisfy at least one of them, but it is more desirable that both of them are within the above-mentioned preferred ranges. When the crossing angles θ1 and θ2 are in the above range, it means that the first concave portion 30 and the second concave portion 31 extend in the longitudinal direction X. The two recesses 30 and 31 respectively function as flow paths for the flow of excretion fluid such as menstrual blood. By setting the crossing angles θ1 and θ2 in the above range, the two recesses 30 and 31 extend in the longitudinal direction X, and the excretion fluid is extended in the longitudinal direction X. The diffusibility can be further improved.

When the two concave portions 30 and 31 are respectively regarded as continuous lines, there is a discontinuous portion 32 at the imaginary intersection point where the two concave portions 30 and 31 intersect and is divided in the extending direction, and the plurality of convex portions 33 pass through the discontinuous portion. 32 while connected. That is, the two recesses 30 and 31 are discontinuous lines, respectively, and the discontinuous part 32 is intermittently arranged in the extending direction (first direction, second direction). The discontinuous part 32 is located so that the two recesses 30 and 31 are respectively The point of intersection of the imaginary continuous lines when the extension direction is imaginarily extended is the imaginary intersection point. The discontinuous portion 32 is a portion that interrupts the continuity of the recessed portions 30 and 31, and is not recessed in a concave shape like the other portions of the recessed portions 30 and 31 except for the discontinuous portion 32. The discontinuous portion 32 typically protrudes toward the wearer's skin side like the convex portion 33, but its protrusion height is lower than that of the convex portion 33.

The two recesses 30 and 31 are respectively formed by applying compression processing to the surface sheet 3 from the side facing the skin, and may be referred to as a "compression portion" depending on the method of forming it. On the other hand, the discontinuous portion 32 including the imaginary intersection point of the two concave portions 30 and 31 as the compressed portion, and the convex portion 33 that is the portion surrounded by the two concave portions 30 and 31 as the compressed portion are not implemented in the front sheet 3 The non-compressed part of compression processing. The density of the two concave portions 30, 31 as the compressed portion is higher than the discontinuous portion 32 and the convex portion 33 as the non-compressed portion. In the front sheet 3, the high-density portion corresponding to the two concave portions 30 and 31 corresponds to The discontinuous portion 32 of the compression portion and the low-density portion of the convex portion 33 coexist, resulting in a density difference in the surface direction.

The compression process for forming the two recesses 30 and 31 may use a method accompanied by melting of the forming material of the front sheet 3 represented by fibers, or a method not accompanied by melting of the forming material. As the compression processing accompanying the melting of the forming material, specifically, known embossing processing such as embossing processing accompanied by heat and ultrasonic embossing can be cited. There are cases where the bottom of the recesses 30 and 31 formed by the compression process accompanying the melting of the forming material, that is, the part overlapping the recesses 30 and 31 as the space in a plan view, loses the original feature of the front sheet 3 The fiber shape and membrane.

As described above, by forming a plurality of two types of recesses 30 and 31 extending so as to cross each other on the skin facing surface of the front sheet 3, the following effects are achieved compared with the case where such recesses are not formed : The diffusibility of excretion fluid in the surface direction is improved, and the air permeability is improved due to the reduction of the contact area between the front sheet 3 and the skin. In addition, the two recesses 30, 31 are divided at their imaginary intersections to form a discontinuous portion 32, thereby, compared with the case where there is no such discontinuity and the two recesses 30, 31 are continuous, the following functions are achieved Effect: The so-called liquid residue that the excretion fluid is not absorbed on the skin facing surface of the front sheet 3 is suppressed, the front sheet 3 is not prone to wrinkles, and the skin feel of the front sheet 3 is improved.

The width of the two recesses 30, 31 (the length of the recesses 30, 31 in the direction orthogonal to the extending direction) is not particularly limited, and is preferably 0.1 mm or more, more preferably 0.3 mm or more, and more preferably 1.5 mm Below, it is more preferably 1.0 mm or less. The length of the discontinuous portion 32 of the two concave portions 30 and 31 along the extending direction of the concave portion 30 or the concave portion 31 is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 5.0 mm or less, more preferably It is 3.0 mm or less.

In a typical example, the width of the two recesses 30 and 31 of the front sheet 3 is narrower than the width of the groove-shaped recess 60 (vertical recess 60X, lateral recess 60Y) of the absorbent core 6. Regarding the ratio of the width of the groove-shaped concave portion 60 to the width of the two concave portions 30, 31, the former is greater than the latter, and the former/the latter is preferably 2 or more, more preferably 3 or more, and preferably 8 or less, more preferably It is 6 or less.

The surface sheet 3 may have a single-layer structure composed of one liquid-permeable sheet, or a laminated structure in which a plurality of liquid-permeable sheets are laminated. When the surface sheet 3 has a laminated structure, the first recessed portion 30 and the second recessed portion 31 can be the junction of the layers (liquid-permeable sheet) constituting the laminated structure. In this case, the layers constituting the laminated structure are merged with each other in the two recesses 30 and 31 to be integrated. The liquid-permeable sheet constituting the surface sheet 3 is typically a non-woven fabric, and contains thermally fusible fibers as constituent fibers. As the hot-melt fiber, a fiber containing a known thermoplastic resin such as polyethylene and polypropylene can be used without particular limitation.

The front sheet 3 may also include heat-extensible fibers whose length is elongated by being heated. If the top sheet 3 contains heat-extensible fibers, the convex portion 33 of the top sheet 3 is clearly projected, and the uneven shape can be made clearer. When the front sheet 3 contains heat-extensible fibers, its content relative to the total mass of the front sheet 3 is preferably 60% by mass or more, more preferably 70% by mass or more, and more preferably 100% by mass Hereinafter, it is more preferably 95% by mass or less.

Examples of heat-extensible fibers include fibers that are elongated by changing the crystalline state of the resin by heating, or fibers that have been subjected to crimping processing and the crimping is released by heating and the apparent length is elongated. The heat-extensible fiber may be, for example, a fiber that is stretched in length by heating it at a heating temperature of preferably 90°C or higher, more preferably 110°C or higher, and preferably 130°C or lower . As a preferable thermally extensible fiber, the following composite fiber can be cited: it contains a first resin component and a second resin component having a lower melting point or softening point than that of the first resin component, and the second resin component is continuously present in the fiber Part or whole of the surface. Furthermore, it is also preferably a fiber that heat-melts with other fibers during thermal elongation. Examples of the first resin component include polypropylene (PP), polyethylene terephthalate, polybutylene terephthalate, etc., and examples of the second resin component include high-density polyethylene (HDPE), low-density polyethylene Density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene propylene copolymer, polystyrene, polypropylene (PP), copolyester, etc. Among these components, by using polypropylene as the first resin component and high-density polyethylene as the second resin component, it is possible to easily obtain thermally extensible fibers imparted with thermal fusibility, which is preferable in this respect . Such thermally extensible fibers can be produced by, for example, the method described in Japanese Patent Laid-Open No. 2005-350836.

The surface sheet 3 can be manufactured by the following method, for example. First, a fiber web mainly composed of unheated heat-extensible fibers is produced by a known method such as a carding method as an intermediate for the production of the front sheet 3. The fiber web may have a single-layer structure or a laminated structure. In the case of using a fiber web of a single-layer structure, the front sheet 3 as a manufactured product has a single-layer structure, and in the case of using a fiber web of a laminated structure, the front sheet 3 as a manufactured product has a laminated structure. Next, hot press processing, which is a type of compression processing, is performed on the above-mentioned fiber web to form the first recessed portion 30 and the second recessed portion 31. At this time, compression processing is not performed at the intersection of the two recesses 30 and 31. In the stage of performing the compression process, the heat-extensible fibers contained in the above-mentioned fiber web are crimped or fused in the two recesses 30, 31, and are fixed without being heat-stretched. Then, the above-mentioned fiber web is heated. The heat treatment of the fiber web can be performed by, for example, a well-known hot air process. By this heat treatment, the portions of the fiber web other than the two recesses 30, 31, especially the multiple regions surrounded by the two recesses 30, 31, stretch the heat-extensible fibers. As a result, the multiple regions become The convex part 33 is looser than the two concave parts 30 and 31. The convex portion 33 formed in this way has a solid structure filled with the constituent fibers of the front sheet 3 (the above-mentioned fiber web), but the fiber density is sparse and bulkier than the two concave portions 30 and 31. The discontinuous portion 32 which is the intersection of the two concave portions 30 and 31 also has substantially the same structure as the convex portion 33. On the other hand, the two concave portions 30, 31 have a pressure bonding portion formed by pressure bonding or bonding the constituent fibers of the front sheet 3, and the heat extensible fibers existing in the two concave portions 30, 31 are subjected to heat extensibility due to pressure bonding. It is hindered, so even after heat treatment, it is still in a non-stretched state.

Furthermore, the above-mentioned method of manufacturing the front sheet is suitable for the case where the front sheet contains heat-extensible fibers, but the front sheet without heat-extensible fibers can also be produced by the same method as the above, or by It is manufactured by a method in which compression processing is performed on the above-mentioned fiber web, and no heating treatment is performed on the fiber web after the compression processing.

The basis weight of the front sheet 3 is not particularly limited, and is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 80 g/m ² or less, more preferably 70 g/m 2 m ² or less.

As described above, since the absorbent core 6 that forms the main body of the absorbent body 5 has groove-shaped recesses 60 (vertical recesses 60X, lateral recesses 60Y) as deformation inducing portions, the sanitary napkin 1 is easy to be worn with The method of filling the gaps in the body is deformed, and the conformability is excellent. In addition, the front sheet 3 has a plurality of linear first recesses 30 and second recesses 31 extending to cross each other on the skin-facing surface of the front sheet 3, and a convex part 33 surrounded by them. In addition, a plurality of imaginary intersection points of the two recesses 30 and 31 are the discontinuous portions 32. Therefore, the sanitary napkin 1 can also exert certain effects in terms of liquid diffusibility and liquid retention resistance. On the other hand, in the sanitary napkin 1, in order to ensure liquid permeability and the like, the front sheet 3 and the absorbent body 5 are locally joined by an adhesive, so there is a concern that the above-mentioned "swelling of the front sheet 3" may occur during wearing.

However, in the sanitary napkin 1, the above-mentioned concern is eliminated by adopting a characteristic structure related to the positional relationship between the front sheet 3 and the absorbent core 6. This characteristic structure means that the absorbent core 6 has an imaginary line extending in one direction through the plurality of discontinuous portions 32 of the front sheet 3 (the symbol "L1x" or "L1y" in FIG. A straight line) correspondingly arranged deformation inducing portion (hereinafter, also referred to as "specific deformation inducing portion"). Specifically, the above-mentioned specific deformation inducing portion is a groove-shaped recessed portion 60 (a longitudinal recessed portion 60X, a lateral recessed portion 60Y).

In this embodiment, as shown in FIG. 5, the absorbent core 6 has a "vertical specific deformation inducing portion" arranged corresponding to a virtual line L1x extending in the longitudinal direction X through a plurality of discontinuous portions 32, and The "lateral specific deformation inducing portion" arranged corresponding to one imaginary line L1y extending in the lateral direction Y through the plurality of discontinuous portions 32 serves as the specific deformation inducing portion. More specifically, the vertical specific deformation inducing portion is a vertical concave portion 60X, and the horizontal specific deformation inducing portion is a horizontal concave portion 60Y, and each has a plurality of them. Moreover, the said vertical specific deformation inducing part (vertical recessed part 60X) and the said horizontal specific deformation inducing part (horizontal recessed part 60Y) cross|intersect, and are orthogonal to each other more specifically.

The "corresponding arrangement" mentioned here not only includes 1) 1 imaginary line L1x, L1y and the groove-shaped recess 60 (longitudinal recess 60X, lateral recess 60Y) as shown in Figure 5, and includes 2) The groove-shaped recessed portion 60 (the longitudinal recessed portion 60X, the lateral recessed portion 60Y) is located in the vicinity of one imaginary line L1x, L1y. Regarding the above 2), "near the imaginary line L1x" refers to the area from the imaginary line L1x to the direction orthogonal to the direction of extension of the imaginary line L1x (ie the lateral direction Y), preferably within 2 mm, more preferably within 0.5 mm . The same goes for "near the imaginary line L1y".

In the front sheet 3, as described above, the first recessed portion 30 and the second recessed portion 31 are typically compressed portions. On the other hand, the discontinuous portion 32 and the convex portion 33 are non-compressed portions. Compared with the two recessed portions 30, 31 is low density and low rigidity. In addition, the imaginary lines L1x and L1y are lines connecting such low-density, low-rigidity discontinuous portions 32 and imaginarily passing through the plurality of convex portions 33 connected via the plurality of discontinuous portions 32. Therefore, it is difficult for the imaginary lines L1x and L1y to become deformation inducing portions (flexible shafts) when the surface sheet 3 is deformed by an external force. In the sanitary napkin 1, the part that is difficult to become the deformation inducing part of the front sheet 3, namely the imaginary line L1x, L1y, and the deformation inducing part of the absorbent core 6 (absorbent body 5), namely the groove-shaped recess 60 (longitudinal recess 60X) , The lateral recesses 60Y) are arranged correspondingly, so the absorber 5 uses the groove-shaped recesses 60 as the deformation inducing portion, and the stress during deformation is difficult to propagate to the front sheet 3, so the "uplift of the front sheet" can be effectively suppressed. Therefore, the sanitary napkin 1 has excellent conformability to the wearer's body due to the action of the groove-shaped recesses 60 (longitudinal recesses 60X, lateral recesses 60Y), and the front sheet 3 is difficult to swell, reducing the swelling of the front sheet 3 The occurrence of undesirable situations caused by it, and the leakage resistance is excellent.

In order to express the swelling suppression effect of such a front sheet, at least a part of the groove-shaped recesses 60 (vertical recesses 60X, lateral recesses 60Y) as the deformation inducing portion of the absorbent core 6 is the above-mentioned specific deformation inducing portion, namely "Deformation inducing part arranged corresponding to one imaginary line extending in one direction through a plurality of discontinuous parts 32", there is no need for all groove-shaped recesses 60 of the absorbent core 6 to be the above-mentioned specific deformation inducing part . That is, when only one part of the plurality of longitudinal recesses 60X and lateral recesses 60Y is the above-mentioned specific deformation inducing portion, the swelling of the front sheet 3 can be effectively suppressed. However, in terms of tendency, the higher the ratio of the above-mentioned specific deformation inducing portion in the groove-shaped recessed portion 60 of the absorbent core 6 is, the more the swelling suppression effect of the front sheet is improved. It is particularly preferable that at a position where the sanitary napkin 1 overlaps the horizontal center line CLy, the absorbent core 6 has a groove-shaped recess 60 as a deformation inducing portion so as to overlap the imaginary line L1x. In this case, the swelling of the front sheet is suppressed when the sanitary napkin 1 is applied to the vaginal opening, the crotch and the like, which are the opposite parts of the excretion part, and the swelling of the front sheet is suppressed, thereby suppressing leakage and reducing discomfort.

Furthermore, as described above, when the sanitary napkin 1 has a liquid-permeable intermediate sheet between the front sheet 3 and the absorber 5, and the intermediate sheet has a plurality of recesses on the side facing the skin, if Arranging the intermediate sheet so that the plurality of recessed portions of the intermediate sheet overlap the deformation inducing portion (groove-shaped recessed portion 60) of the absorbent core 6 makes it easier to exert the above-mentioned effect.

In addition, in this embodiment, as described above, as shown in FIG. 5, the absorbent core 6 has a longitudinal recess 60X as the longitudinal specific deformation inducing portion, and a lateral recess 60Y as the lateral specific deformation inducing portion, as The above-mentioned specific deformation inducing portion, and the longitudinal recessed portion 60X and the lateral recessed portion 60Y intersect (perpendicularly), in order to more stably express the swelling suppression effect of the front sheet 3, the two crossing directions (longitudinal X, lateral Y) are respectively The configuration having the above-mentioned specific deformation inducing portion is preferable, but this configuration is not necessary. That is, in the present invention, the absorbent core 6 may have only any one of the above-mentioned vertical specific deformation inducing portion and the above-mentioned horizontal specific deformation inducing portion.

Considering the "groove-shaped recesses 60 (vertical recesses 60X, lateral recesses 60Y) of the absorbent core 6" and "the first recesses 30 and the second recesses 31 of the front sheet 3" as elements related to the above-mentioned specific deformation inducing portion It functions as a flow path for excretion fluid, and has a great impact on the liquid diffusibility and even leakage resistance of the sanitary napkin 1, in order to improve the liquid diffusibility in the longitudinal direction X and reliably prevent lateral leakage, and improve the absorption efficiency of the absorbent body 5 It is preferable that the absorbent core 6 has at least the aforementioned longitudinal specific deformation inducing portion, that is, a longitudinal recess 60X arranged corresponding to a virtual line L1x extending in the longitudinal direction X through a plurality of discontinuous portions 32 as the aforementioned specific deformation Induction Department.

In this embodiment, as shown in FIG. 5, the longitudinal recesses 60X, which are the above-mentioned longitudinal specific deformation inducing portions, which are arranged corresponding to the imaginary line L1x, are intermittently arranged in the transverse direction Y, which are adjacent to the longitudinal direction Y There is a non-linear virtual line L2x between the recessed portions 60X, and the non-linear virtual line L2x extends non-linearly in the longitudinal direction X through a plurality of discontinuous portions 32. That is, the longitudinal recesses 60X (virtual line L1x) and the non-linear virtual line L2x are alternately arranged in the lateral direction Y. In this embodiment, the non-linear virtual line L2x has a zigzag line shape in a plan view. The non-linear imaginary line L2x is the same as the imaginary line L1x. It is difficult to become the deformation-inducing part (flexible shaft) when the front sheet 3 is deformed by external force and is not prone to wrinkles. Such non-linear imaginary line L2x exists. Between the longitudinal recesses 60X intermittently arranged in the transverse direction Y as the longitudinal specific deformation inducing portion, the adhesion of the front sheet 3 to the wearer's skin can be further improved.

In this embodiment, in the horizontal direction Y, similarly to the vertical direction X, there is a non-linear imaginary line extending non-linearly in one direction through a plurality of discontinuous portions 32 between the plurality of specific deformation inducing portions. . That is, the lateral recesses 60Y, which are the above-mentioned lateral specific deformation inducing portions, which are arranged corresponding to the imaginary line L1y, are intermittently arranged in the longitudinal direction X, and the lateral recesses 60Y adjacent in the longitudinal direction X exist between each other. The discontinuous portion 32 is a non-linear virtual line L2y extending non-linearly in the lateral direction Y. That is, the lateral recesses 60Y (virtual line L1y) and the non-linear virtual line L2y are alternately arranged in the longitudinal direction X. In this embodiment, the non-linear virtual line L2y has a zigzag line shape in a plan view. Thus, in both the longitudinal direction X and the lateral direction Y, between the plurality of the above-mentioned specific deformation inducing portions (60X, 60Y), there are parts of the front sheet 3 that are not likely to become wrinkles and correspond to the non-linear imaginary lines L2x, L2y In this way, the adhesion of the front sheet 3 to the wearer's skin can be further improved.

In this embodiment, as shown in FIG. 4, the convex portion 33 of the front sheet 3 has a polygonal shape in a plan view, and includes two or more types of convex portions 33A, 33B, and 33C with different areas. The areas of the two convex portions 33 (33A, 33B, 33C) adjacent to the two concave portions 31 are different from each other. That is, in the present embodiment, the convex portions 33 having the same area are not adjacent to each other via the first concave portion 30 or the second concave portion 31. More specifically, the front sheet 3 includes two types of large convex portions 33A and small convex portions 33C having a rhombic shape in plan view, and a middle convex portion 33B having a parallelogram shape in plan view, which are different in area, as the convex portion 33, that is, Contains three types of protrusions 33 with different areas. Furthermore, one large convex portion 33A and four middle convex portions 33B are adjacent to each other via the first concave portion 30 or the second concave portion 31 delimiting the one large convex portion 33A, and the four middle convex portions 33B and the four middle convex portions 33B are adjacent to each other. The small convex portion 33C is adjacent to each other via the first concave portion 30 or the second concave portion 31. The four small convex portions 33C are respectively located on the imaginary line of the long axis or the short axis of one large convex portion 33A. These three types of nine convex parts 33 (33A, 33B, 33C) are shown as thick solid lines in FIG. On the skin-facing surface of the front sheet 3, a plurality of rhombus shapes composed of such nine convex portions 33 in one group is formed.

In this way, in the front sheet 3, there are two or more types of convex portions 33 having a polygonal shape in plan view with different areas, and the convex portions 33 having the same area are adjacent to each other without the first concave portion 30 or the second concave portion 31 therebetween. When the convex portion 33 is arranged, when the front sheet 3 is deformed by external force such as body pressure, the convex portion 33 with a relatively small area (small convex portion 33C in this embodiment) is deformed prior to the other convex portions 33, so the area is relatively relatively small. The deformation of the larger convex portion 33 (in this embodiment, the large convex portion 33A and the middle convex portion 33B, especially the large convex portion 33A) is suppressed and the thickness is maintained. As a result, the front sheet 3 can be formed in the longitudinal direction X Folds extending upward (longitudinal folds). If such longitudinal wrinkles are formed in the surface sheet 3, the surface sheet 3 is unlikely to swell.

In addition, in this embodiment, the convex portion 33 of the surface sheet 3 includes two or more types of convex portions 33A, 33B, 33C with different thicknesses, and two convex portions 33 adjacent to each other via the first concave portion 30 or the second concave portion 31 The thickness of (33A, 33B, 33C) is different from each other. That is, in this embodiment, the convex portions 33 having the same thickness are not adjacent to each other via the first concave portion 30 or the second concave portion 31. More specifically, in this embodiment, the thickness of the three types of protrusions 33A, 33B, and 33C with different areas increases in proportion to the area. Therefore, the large protrusion 33A has the largest thickness, the small protrusion 33C has the smallest thickness, and the middle The convex portion 33B has a thickness between the two convex portions 33A and 33C. FIG. 6 shows that the thickness of the large convex portion 33A>the thickness of the small convex portion 33C.

Such "the front sheet 3 has two or more types of convex portions 33 with different thicknesses, and the convex portions 33 are arranged so that the convex portions 33 of the same thickness are not adjacent to each other via the first concave portion 30 or the second concave portion 31" The structure exhibits the above-mentioned "There are two or more types of convex portions 33 having a polygonal shape in plan view with different areas in the front sheet 3, and the convex portions 33 of the same area are not separated from each other by the first concave portion 30 or the second concave portion 31. The adjacent configuration of the convex portion 33" has the same effect, and the synergistic effect of the two configurations can prevent the swelling of the front sheet 3 more reliably.

The maximum thickness of the convex portion 33, the thickness T1 at the top of the large convex portion 33A in this embodiment (refer to FIG. 6) is preferably 0.5 mm or more, more preferably 1.0 mm or more, and more preferably 5.0 mm or less , More preferably 3.0 mm or less. The minimum thickness of the convex portion 33, in this embodiment, the thickness T2 at the top of the small convex portion 33C (refer to FIG. 6) is preferably 0.1 mm or more, more preferably 0.5 mm or more, and more preferably 1.0 mm or less , More preferably 0.7 mm or less. The thickness of each part of the front sheet is measured by the following method. In addition, unless otherwise specified, the thickness of other constituent members of the absorbent article represented by the absorbent core (absorbent body) can also be measured according to the following method.

<Method for Measuring Thickness> The thickness is measured in a state where a load of ^{5 cN/cm 2 is} applied to the measurement sample (for example, the front sheet). Specifically, the thickness is measured using, for example, a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG. CO. LTD.). At this time, between the front end of the thickness gauge and the measurement sample, a circular or square plate (acrylic plate with a thickness of about 5 mm) that has been adjusted ^{so that the load becomes 5 cN/cm 2 is arranged.} And measure the thickness. In the thickness measurement, measure any 10 locations of the measurement sample, calculate the average value of the thickness of these 10 locations, and use it as the thickness of the measurement sample.

Fig. 7 shows an absorbent core 6A as an embodiment of the absorbent core of the present invention. Regarding another embodiment described below, the components different from the above-mentioned embodiment (absorbent core 6) are mainly described, and the same components are denoted by the same reference numerals and the description is omitted. The description of the above-mentioned embodiment (absorbent core 6) is appropriately applied to the unspecified configuration in another embodiment described below.

As shown in FIG. 7, the absorptive core 6A has a thick portion 63 whose thickness is larger than that of the peripheral portion. The thick-walled part 63 is arranged at a part facing the excretory part such as the vaginal opening of the wearer. In this embodiment, the central part in the transverse direction Y of the longitudinal central region M in the absorbent core 6A is the thick-walled part 63, and the part except the thick-walled part 63 in the absorbent core 6A is the thick-walled part 63 Small thin-walled part 64. Compared with the thin-walled portion 64, the thick-walled portion 63 has higher rigidity than the increase in the basis weight of the forming material of the absorbent core 6. The thick portion 63 protrudes to the skin side (the front sheet 3 side) of the wearer of the sanitary napkin 1, but does not protrude to the non-skin side (the back sheet 4 side). Groove-shaped recesses 60 (longitudinal recesses 60X, lateral recesses 60Y) as deformation inducing portions are formed in both the thick-walled portion 63 and the thin-walled portion 64.

In the absorbent core 6A, the thick-walled portion 63 is present in the portion (vertical central region M) facing the excretion portion of the wearer. The portion of the sanitary napkin 1 that overlaps with the thick-walled portion 63 in a plan view is typically It is the central part of the transverse Y of the longitudinal central region M that is in close contact with the excretion part of the wearer. Therefore, it complements the swelling suppression effect of the front sheet 3, which can improve the adhesion or followability of the sanitary napkin 1 to the wearer's body, and even Can improve wearing feeling and liquid absorption.

In addition, the thick portion 63 may protrude toward the non-skin side (the back sheet 4 side) of the wearer of the sanitary napkin 1. Moreover, it is not necessary to form the groove-shaped recessed part 60 (longitudinal recessed part 60X, horizontal recessed part 60Y) as a deformation inducing part in the thick part 63. Moreover, in the form of FIG. 7, the thick part 63 is arrange|positioned at the center part of the horizontal direction Y of the absorptive core 6A, but it may be arrange|positioned across the full length (full width) of the horizontal direction Y of 6A of absorptive cores. In addition, the thick portion 63 may extend from the longitudinal center region M across the front region F and/or the rear region R.

In order to more reliably exert the effect of the thick wall portion 63, the thickness of the thick wall portion 63 (the maximum thickness when the thickness of the thick wall portion 63 is not fixed) is preferably 3 mm or more and 30 mm or less, more preferably 4 mm Above 20 mm. In addition, when the absorbent article incorporating the absorbent core 6A having the thick portion 63 is a menstrual sanitary napkin, the thickness of the thick portion 63 is preferably 3 mm or more, more preferably 4 mm or more, and , Preferably 10 mm or less, more preferably 8 mm or less. Furthermore, when the thick-walled portion 63 has the groove-shaped recessed portion 60, the thickness of the thick-walled portion 63 is the thickness of the small absorbing portion 61 in the thick-walled portion 63. The side protruding from the thick-walled portion 63 (the skin-facing surface side or the non-skin-facing surface side of the absorbent core 6A) when the thick-walled portion 63 is viewed in a plan view, the area of the thick-walled portion 63 is the same as that of the absorbent core 6A The area of the entire side is preferably 20% or more, more preferably 25% or more, and more preferably 60% or less, more preferably 50% or less.

The thickness of the thin portion 64 (thickness of the portion other than the thick portion 63 in the absorbent core 6A) is preferably 1 mm or more and 25 mm or less, more preferably 2 mm or more and 15 mm or less. Moreover, when the absorbent article incorporating the absorbent core 6A having the thin-walled portion 64 is a menstrual sanitary napkin, the thickness of the thin-walled portion 64 is preferably 1 mm or more, more preferably 2 mm or more, and , Preferably 8 mm or less, more preferably 6 mm or less. Furthermore, when the thin-walled portion 64 has the groove-shaped recess 60, the thickness of the thin-walled portion 64 is the thickness of the small absorption portion 61 in the thin-walled portion 64.

As mentioned above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-mentioned embodiments, and can be appropriately changed. The absorbent article of the present invention broadly includes articles for absorbing body fluids (urine, soft stool, menstrual blood, sweat, etc.) discharged from the human body. In addition to the menstrual sanitary napkins mentioned above, it also includes sanitary underwear, so-called unfolding disposables with fixed tape Type diapers, shorts type disposable diapers, incontinence pads, etc. Regarding the above-mentioned embodiments of the present invention, the following additional notes are further disclosed.

＜1＞ An absorbent article comprising: an absorbent body having a longitudinal direction corresponding to the front and back directions of a wearer and a transverse direction orthogonal to the longitudinal direction, and including an absorbent core that absorbs and retains body fluids; and a front sheet, which is arranged in The skin facing side of the absorbent body; and the front sheet and the absorbent body are partially joined by an adhesive, and the front sheet has a plurality of skin facing faces extending in one direction on the skin facing surface of the front sheet. A linear first concave portion, a linear second concave portion extending in a direction intersecting the one direction, and a convex portion surrounded by two concave portions. The first concave portion and the second concave portion shall be regarded as continuous lines, respectively When the imaginary intersection point where the first recess and the second recess intersect, there is a discontinuity in the extending direction, and a plurality of the protrusions are connected to each other via the discontinuity, and the absorbent core is deformed An inducing part, the deformation inducing part is arranged corresponding to a virtual line extending in one direction through a plurality of the discontinuous parts. ＜2＞ An absorbent article such as <1>, wherein the convex part has a polygonal shape in a plan view, and includes two or more kinds of convex parts with different areas, and the two convex parts adjacent to each other via the first concave part or the second concave part The area is different from each other. ＜3＞ Such as the absorbent article of <1> or <2>, wherein the protrusions include two or more types of protrusions with different thicknesses, and the thicknesses of the two protrusions adjacent to each other through the first recess or the second recess are different from each other same. ＜4＞ The absorbent article according to any one of <1> to <3>, wherein the absorbent core has a longitudinal deformation inducing portion as the deformation inducing portion, and the longitudinal deformation inducing portion is connected to each other by a plurality of the discontinuous portions. The above-mentioned one imaginary line extending in the longitudinal direction is arranged correspondingly. ＜5＞ Such as the absorbent article of <4>, wherein a plurality of the longitudinal deformation inducing portions are intermittently arranged in the lateral direction, and there is a non-linear imaginary line between the longitudinal deformation inducing portions adjacent to each other in the lateral direction, and the non-linear shape The imaginary line extends non-linearly in the longitudinal direction through a plurality of the discontinuous portions. ＜6＞ The absorbent article of <4> or <5>, wherein the absorbent core has a transverse deformation inducing portion as the deformation inducing portion, and the transverse deformation inducing portion is extended in the transverse direction by a plurality of the discontinuous portions. One of the imaginary lines is arranged correspondingly, and the longitudinal deformation inducing portion and the lateral deformation inducing portion intersect. ＜7＞ The absorbent article according to any one of <1> to <6>, wherein the above-mentioned absorbent core has a thick wall portion at a portion facing the excretion portion of the wearer that is larger than the peripheral portion.

＜8＞ The absorbent article of any one of <1> to <7>, which has a liquid-permeable intermediate sheet between the surface sheet and the absorber. ＜9＞ The absorbent article of <8>, wherein the intermediate sheet does not have the first recessed portion and the second recessed portion. ＜10＞ The absorbent article according to <8> or <9>, wherein the intermediate sheet has a plurality of recesses provided separately from the front sheet. ＜11＞ The absorbent article of <10>, wherein the plurality of recesses of the intermediate sheet overlap with the deformation inducing part of the absorbent core.

＜12＞ The absorbent article according to any one of <1> to <11>, wherein the deformation inducing portion is a groove-shaped recess. ＜13＞ The absorbent article of <12>, wherein the groove-shaped recess has a longitudinal recess extending in the longitudinal direction, and the length of the longitudinal recess in the lateral direction is preferably 1.0 mm or more, more preferably 3.0 mm or more, and more It is preferably 10.0 mm or less, and more preferably 5.0 mm or less. ＜14＞ The absorbent article according to any one of <1> to <13>, wherein the intersection angle θ1 between the first recess and the transverse imaginary straight line extending in the transverse direction through the first recess is preferably 45 degrees or more, and more It is preferably 55 degrees or more, more preferably 75 degrees or less, and more preferably 65 degrees or less. ＜15＞ The absorbent article according to any one of <1> to <14>, wherein the width of each of the first recess and the second recess is preferably 0.1 mm or more, more preferably 0.3 mm or more, and more preferably 1.5 mm or less, more preferably 1.0 mm or less. ＜16＞ The absorbent article of any one of <1> to <15>, wherein the length of the discontinuous portion along the extending direction of the first recess or the second recess is preferably 1.0 mm or more, more preferably 1.5 mm Above, more preferably 5.0 mm or less, more preferably 3.0 mm or less. ＜17＞ The absorbent article according to any one of <1> to <16>, wherein the above-mentioned surface sheet contains heat-extensible fibers. ＜18＞ The absorbent article according to any one of <1> to <17>, wherein the absorbent core has Deformation inducing part arranged corresponding to the above-mentioned imaginary line. ＜19＞ The absorbent article according to any one of <1> to <18>, wherein the above-mentioned absorbent article is a menstrual sanitary napkin. [Industrial availability]

The absorbent article of the present invention has excellent conformability to the wearer's body, and the front sheet is difficult to swell and has excellent leakage resistance.

1: Sanitary napkin 2: Absorbent body 2S: Flank 2W: Wing 3: Front sheet 4: Back sheet 5: Absorber 6: Absorbent core 6A: Absorbent core 6a: The opposite side of the skin 6b: Non-skin facing side 7: Package chip material 8: Side sheet 9: Front depression 30: The first recess 31: The second recess 32: discontinuous part 33: Convex 33A: Convex 33B: Convex 33C: Convex 60: Groove-shaped recess 60X: Longitudinal recess 60Y: Horizontal recess 61: Small absorption part 62: continuous layer 63: Thick-walled part 64: Thin-walled part 81: Joint CLy: Horizontal centerline D: depth F: Front area L1x: imaginary line L2x: Non-linear imaginary line L1y: imaginary line L2y: Non-linear imaginary line M: Longitudinal central area R: Rear area T: thickness T1: thickness T2: thickness VLy: Horizontal imaginary straight line θ1: Crossing angle θ2: Crossing angle

Fig. 1 is a perspective view schematically showing a part of the skin facing side (front sheet side) of a menstrual sanitary napkin as an embodiment of the absorbent article of the present invention. Fig. 2 is a schematic cross-sectional view taken along the line I-I in Fig. 1. Figure 3 is a diagram schematically showing the absorbent core of the menstrual sanitary napkin shown in Figure 1, Figure 3(a) is a plan view of the skin facing side of the absorbent core, Figure 3(b) It is a cross-sectional view along the II-II line of Fig. 3(a), and Fig. 3(c) is a plan view of the non-skin facing side of the absorbent core. Fig. 4 is a plan view schematically showing the skin facing surface of the front sheet of the menstrual sanitary napkin shown in Fig. 1 and the deformation inducing portion (groove-shaped recessed portion) of the absorbent core. Fig. 5 is a diagram showing a virtual line extending in one direction through the intersection (discontinuous portion) of the first recess and the second recess of the front sheet in Fig. 4. Fig. 6 is a schematic cross-sectional view of the menstrual sanitary napkin shown in Fig. 1 at a position corresponding to the line III-III of Fig. 4. Fig. 7 is a schematic perspective view of another embodiment of the absorbent core of the present invention.

3: Front sheet

30: The first recess

31: The second recess

32: discontinuous part

33: Convex

33A: Convex

33B: Convex

33C: Convex

60: Groove-shaped recess

60X: Longitudinal recess

60Y: Horizontal recess

VLy: Horizontal imaginary straight line

θ1: Crossing angle

θ2: Crossing angle

Claims (19)

An absorbent article comprising: an absorbent body having a longitudinal direction corresponding to the front and back directions of a wearer and a transverse direction orthogonal to the longitudinal direction, and including an absorbent core that absorbs and retains body fluids; and a front sheet, which is arranged in The skin facing side of the absorbent body; and The surface sheet and the absorber are partially joined by an adhesive, The front sheet has a plurality of linear first recesses extending in one direction, a linear second recess extending in a direction intersecting the one direction, and a plurality of linear second recesses on the skin facing surface of the front sheet. The convex part surrounded by two concave parts, When the first concave portion and the second concave portion are respectively regarded as continuous lines, there is a discontinuous portion at the imaginary intersection point where the first concave portion and the second concave portion intersect and is divided in the extending direction, and a plurality of the convex portions The parts are connected to each other via the discontinuous part, The absorptive core has a deformation inducing portion, and the deformation inducing portion is arranged corresponding to a virtual line extending in one direction through a plurality of the discontinuous portions. The absorbent article of claim 1, wherein the convex portion has a polygonal shape in a plan view, and includes two or more kinds of convex portions with different areas, The areas of the two adjacent convex portions that are adjacent to each other across the first concave portion or the second concave portion are different from each other. The absorbent article of claim 1, wherein the convex portion includes two or more types of convex portions with different thicknesses, The thicknesses of the two adjacent convex portions that are adjacent to each other via the first concave portion or the second concave portion are different from each other. The absorbent article of claim 1, wherein the absorbent core has a longitudinal deformation inducing portion as the deformation inducing portion, and the longitudinal deformation inducing portion is a hypothetical one extending in the longitudinal direction through a plurality of the discontinuous portions The lines are configured accordingly. The absorbent article of claim 4, wherein a plurality of the longitudinal deformation inducing portions are intermittently arranged in the lateral direction, and a non-linear imaginary line exists between the longitudinal deformation inducing portions adjacent to each other in the lateral direction, and the non-linear shape The imaginary line extends non-linearly in the longitudinal direction through a plurality of the discontinuous portions. The absorbent article of claim 4, wherein the absorbent core has a lateral deformation inducing portion as the deformation inducing portion, and the lateral deformation inducing portion is an imaginary piece extending in the lateral direction by a plurality of the discontinuous portions Lines are configured accordingly, The longitudinal deformation inducing portion and the lateral deformation inducing portion intersect. The absorbent article according to claim 1, wherein the absorbent core has a thick wall portion at a portion facing the excretion portion of the wearer that is larger than the peripheral portion. The absorbent article according to claim 1, which has a liquid-permeable intermediate sheet between the surface sheet and the absorbent body. The absorbent article according to claim 8, wherein the intermediate sheet does not have the first recessed portion and the second recessed portion. The absorbent article according to claim 8, wherein the intermediate sheet has a plurality of recesses provided separately from the front sheet. The absorbent article according to claim 10, wherein the plurality of recessed portions of the intermediate sheet overlap with the deformation inducing portion of the absorbent core. The absorbent article according to claim 1, wherein the deformation inducing portion is a groove-shaped concave portion. The absorbent article of claim 12, wherein the groove-shaped recess has a longitudinal recess extending in the longitudinal direction, and the length of the longitudinal recess in the lateral direction is 1.0 mm or more and 10.0 mm or less. The absorbent article according to claim 1, wherein the intersection angle θ1 between the first recess and the transverse imaginary straight line extending in the transverse direction through the first recess is 45 degrees or more and 75 degrees or less. The absorbent article of claim 1, wherein the width of each of the first recessed portion and the second recessed portion is 0.1 mm or more and 1.5 mm or less. The absorbent article of claim 1, wherein the length of the discontinuous portion along the extending direction of the first recess or the second recess is 1.0 mm or more and 5.0 mm or less. The absorbent article according to claim 1, wherein the above-mentioned front sheet comprises heat-extensible fibers. The absorbent article of claim 1, wherein at a position overlapping with a transverse center line that halves the absorbent article in the transverse direction and extends in the longitudinal direction, the absorbent core has a position corresponding to the imaginary line Deformation induction department. The absorbent article of claim 1, wherein the above-mentioned absorbent article is a menstrual sanitary napkin.

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