JP6842886B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

In absorbent articles such as sanitary napkins, the materials and structures of each member have been improved to improve their functions and wearing comfort.
For example, Patent Document 1 describes an absorbent article in which the surface sheet forming the skin contact surface has a concavo-convex structure composed of streaky convex portions and concave portions, and the absorber has a highly flexible region. ing. The highly flexible region is composed of an embossed compression portion and is arranged corresponding to the concave portion. As a result, the absorbent article can easily follow the shape change of the wearer's skin surface, and the absorbent body is less likely to be twisted. Further, in the absorbent article described in Patent Document 2, from the viewpoint of suppressing the occurrence of unintended wrinkles, the surface sheet has a concavo-convex structure in which streaky convex portions and concave portions are arranged, and the low basis weight portion of the absorber is described above. It is arranged so that it overlaps the top of the ridge.
Patent Document 3 describes that, from the viewpoint of making the absorbent article soft and hard to twist, the absorbent body is embossed with a thermoplastic resin fiber and the absorbent body is bonded to the skin side layer and the clothing side layer. Has been done.
In Patent Document 4, from the viewpoint of suppressing the thickness of the absorber and suppressing the reversion of the body fluid, an absorbent article in which the absorber squeezed portion is arranged in a grid pattern on the absorber and the surface sheet squeezed portion is arranged on the surface sheet. Is described. The surface sheet squeezed portion has an arrangement pattern different from that of the absorber squeezed portion, and is arranged so as to overlap with a small area partitioned by the absorber squeezed portion.

Japanese Unexamined Patent Publication No. 2016-77900 Japanese Unexamined Patent Publication No. 2016-77577 Japanese Unexamined Patent Publication No. 2016-123627 Japanese Unexamined Patent Publication No. 2013-141

When the absorbent article is worn, various twists may occur due to changes in the wearer's body shape, pressing of the thighs, and the like. For example, there is a shallow vertical twist (hereinafter, also referred to as "wrinkle twist") on the surface of the surface sheet. In addition, there are twists (hereinafter, also referred to as "multiple folds") such that the product width is narrower than that at the time of mounting due to repeated mountain folds and valley folds in the thickness direction. Such twisting, especially wrinkling of the surface sheet, can cause leakage of excrement.
For multiple folds, embossing the absorbers described in Patent Documents 3 and 4 can be mentioned as one of the countermeasures. However, even in this case, the suppression of wrinkles formed on the surface of the surface sheet is not sufficiently satisfactory, and multiple folds are likely to occur triggered by the wrinkles on the surface sheet. Further, in the absorbent articles described in Patent Documents 1 and 2, while the absorber is easily deformed along the uneven structure of the surface sheet to fit the skin, the suppression of the above-mentioned various aspects of twisting is not sufficiently satisfactory. There wasn't.

In view of the above points, the present invention relates to the provision of an absorbent article that simultaneously solves multiple folds and wrinkles.

The present invention has a front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and an intermediate layer arranged between the front surface sheet and the back surface sheet, and is a ventral portion of the wearer. An absorbent article having a vertical direction arranged along a direction connecting the lower crotch and the dorsal side and a horizontal direction orthogonal to the vertical direction, and the surface sheet is a ridge extending in the vertical direction. The groove structure has a ridged groove structure in which the grooves and the grooves are arranged alternately in the horizontal direction at least in the center of the horizontal direction, and the intermediate layer is formed in a grid pattern extending in the vertical direction and diagonally with respect to the horizontal direction. Provided is an absorbent article having an arranged embossed portion.

The absorbent article of the present invention can solve multiple folds and wrinkles at the same time.

It is a partially cutaway perspective view schematically showing a panty liner as a preferable embodiment of the absorbent article of the present invention. (A) is a partially cutaway plan view of the panty liner of FIG. 1 as viewed from the skin contact surface side, and (B) is a partially cutaway plan view showing a modified example. FIG. 3 is an enlarged cross-sectional view taken along line III of FIG. It is a partially enlarged sectional view schematically showing the ridge structure of a surface sheet.

The absorbent article of the present invention will be described below with reference to the drawings, based on the panty liner as the preferred embodiment. However, the absorbent article of the present invention is not limited to the panty liner of the embodiment shown below, and can be applied to various things such as sanitary napkins, incontinence pads, incontinence liners, diapers, and urine absorbing pads. ..

In the present invention, unless otherwise specified, the side relatively close to the human body when worn is referred to as the skin surface side, the skin contact surface side or the surface side, and the side opposite to this, which is relatively far from the human body, is referred to as the skin surface side, the skin contact surface side or the surface side. It is called the non-skin surface side, the non-skin contact surface side or the back surface side. The direction in which the human body is located on the front side when worn is referred to as the front end, the end thereof is referred to as the front end portion, and the direction located on the rear side is referred to as the rear end portion. The direction connecting the front end portion and the rear end portion, that is, the direction connecting the ventral side portion, the crotch portion and the back side portion of the wearer is referred to as the longitudinal direction (Y direction) of the absorbent article. The direction orthogonal to this vertical direction is called the horizontal direction (X direction). Further, the normal direction of the front surface or the back surface of the absorbent article is referred to as a thickness direction, and the amount thereof is referred to as a thickness.

1, FIG. 2 (A) and FIG. 3 show the panty liner 10 of the first embodiment.
The panty liner 10 has a front surface sheet 1 on the skin contact surface side, a back surface sheet 2 on the non-skin contact surface side, and an intermediate layer 3 arranged between the front surface sheet 1 and the back surface sheet 2. The front surface sheet 1 is bonded to the back surface sheet 2 outside the peripheral edge of the intermediate layer 3 by a joining means such as a heat seal or an ultrasonic seal, or by using a hot melt type adhesive in combination. The front surface sheet 1 is liquid permeable, and the back surface sheet 2 is liquid impervious. The liquid impermeability means a property that it is difficult for a liquid to permeate, and includes waterproofness, water repellency, and liquid impermeability. An adhesive portion (not shown) for fixing to underwear such as shorts is arranged on the non-skin contact surface side of the back sheet 2.

The surface sheet 1 has a ridge groove structure 6 in which ridges 4 and grooves 5 extending in a streak pattern in the vertical direction (Y direction) are arranged alternately in the horizontal direction (X direction). The ridge structure 6 is arranged at least in the center in the lateral direction (X direction), and is located on the entire surface of the surface sheet 1 in the present embodiment. The center in the lateral direction (X direction) in which the ridge structure 6 is arranged is a portion including a region corresponding to the excretory portion of the wearer, and includes a region that receives a large amount of excretory liquid. As an embodiment in which the ridge structure 6 is provided at the center in the lateral direction, for example, a modified example shown in FIG. 2 (B) can be mentioned. As shown in the figure, the “horizontal center” is preferably 50% of the horizontal length M1 centered on the horizontal (X direction) center line with respect to the shortest horizontal length M2 of the panty liner 10. Means within range. The ridge structure 6 of the surface sheet 1 is arranged in at least this range. Further, from the viewpoint of preventing leakage, it is preferable that the panty liner 10 is arranged in a range of 50% or more of the horizontal length M1 centered on the center line of the horizontal direction X with respect to the shortest horizontal length M2. It is particularly preferable that the surface sheet 1 is arranged on the entire surface.

By arranging the ridge structure 6 at least in the center in the lateral direction (X direction), it is possible to suppress wrinkles in a region that receives a large amount of excrement. This is to suppress wrinkles by utilizing the flexible shaft due to the ridge structure 6. That is, even if an external force is temporarily applied, the surface of the surface sheet is deformed along the unevenness of the ridge structure 6 and the shape is restored, so that it is difficult for a crease mark to remain as in the conventional wrinkle. The flexible shaft referred to here means a shaft serving as a base point at which an article bends and returns (hereinafter, the same applies in the present specification).
As a result, unintended liquid flow on the surface of the surface sheet 1 can be effectively suppressed. For example, wrinkles are usually likely to be irregularly formed on a part of the surface of the surface sheet. In addition, in the wrinkled part, the fibers are close to each other and the eyes are easily clogged. Such wrinkles remain as creases. Therefore, conventionally, the excrement liquid may spread in an unintended direction, for example, laterally, and leak laterally at the end of the break while flowing along the wrinkles on the surface of the surface sheet. On the other hand, the ridge structure 6 can prevent such an unintended liquid flow by suppressing the occurrence of wrinkles. Moreover, since the ridge structure 6 is provided in the shape of a non-woven fabric, the liquid can be permeated without clogging of the fibers caused by twisting. Further, since the ridge structure 6 extends in the vertical direction (Y direction), the liquid is prevented from diffusing in the horizontal direction and lateral leakage is prevented, and the liquid is spread over a wide range in the vertical direction (Y direction). Can be efficiently and quickly permeated.

In the present embodiment, since the ridge structure 6 is provided on the entire surface sheet 1, the occurrence of wrinkles on the entire surface sheet 1 can be suppressed more effectively. Further, it is possible to suppress even the blister at the end of the panty liner 10.

The intermediate layer 3 is a layer having a function of absorbing and holding the excrement liquid permeated from the surface sheet 1. In the use of the panty liner 10, the thickness of the intermediate layer 3 is thinner than that of other absorbent articles such as sanitary napkins and diapers. Nevertheless, from the viewpoint of the function of absorbing and retaining the excrement liquid, the surface sheet 1 is thicker than the surface sheet 1 which allows the excrement liquid to permeate quickly. The thickness of the intermediate layer 3 is preferably 0.1 mm or more and 4.0 mm or less, more preferably 0.2 mm or more and 3.0 mm or less, and the basis weight is preferably 10 g / m ² or more and 100 g / m ² or less. , More preferably 20 g / m ² or more and 80 g / m ² or less.

The intermediate layer 3 has at least a liquid-retaining absorber 31, and in the present embodiment, the intermediate layer 3 is composed of the absorber 31 and an intermediate sheet 32 that covers the skin contact surface side of the absorber 31. The intermediate sheet 32 is a member that promotes the transfer to the absorber 31 while spreading the excrement liquid permeated from the surface sheet 1 in the surface direction. The intermediate sheet 32 can suppress settling when the absorber 3 which is the liquid holding portion holds the liquid. Therefore, it is preferable to have the intermediate sheet 32 from the viewpoint of suppressing various twists. Further, when the intermediate sheet 32 is made of a non-woven fabric, the restoring force against compression is higher than that of paper or the like, and the effect of suppressing twisting is further enhanced.

The intermediate layer 3 has embossed portions 7 arranged in a grid pattern extending in diagonal directions with respect to the vertical direction (Y direction) and the horizontal direction (X direction). The embossed portion 7 is a portion in which a member is squeezed in the thickness direction by embossing, and is also referred to as a squeezed portion. The embossed portions 7 are arranged in a grid pattern in a plan view of the intermediate layer 3. The “lattice” means a shape in which a plurality of quadrangles drawn by the embossed portion 7 are connected and regularly arranged. Adjacent quadrangles share the apex 71 and the side 72, and the directions of the sides 72 of each quadrangle are aligned. As a result, the quadrangles are arranged side by side in the direction (two directions) in which the sides 72 of the adjacent quadrangles are connected to each other. The "lattice extending diagonally with respect to the vertical direction (Y direction) and the horizontal direction (X direction)" means that the directions (two directions) in which the sides 72 of adjacent squares are connected are the vertical direction (Y direction) and It means that it is diagonal with respect to the lateral direction (X direction). At this time, the directions (two directions) connecting the vertices 71 that form the quadrangle and are arranged opposite to each other are preferably the directions along the vertical direction (Y direction) and the horizontal direction (X direction).

The embossed portion 7 can take various forms as long as it is arranged so as to form the side 72 of the quadrangle described above. For example, the embossed portion 7 may be linear to form a quadrangular side 72. Further, the side 72 of the quadrangle may be formed by arranging a plurality of the embossed portions 7 in the shape of dots or broken lines. In the case of making dots, the shape of one point can be various. For example, geometric shapes such as circles, triangles, and quadrangles, and shapes that imitate the shapes of objects such as stars and animals can be mentioned.

The grid-like arrangement of the embossed portions 7 extends diagonally with respect to the vertical direction (Y direction) and the horizontal direction (X direction), so that the intermediate layer 3 can be obliquely oriented with respect to the horizontal direction (X direction). It becomes a flexible axis. As a result, in the panty liner 10, the drag force that repels the compression from the lateral direction (X direction) becomes high. Further, since the embossed portion 7 serving as the flexible shaft is a consolidated portion formed by pressing the member, the planar shape of the intermediate layer 3 is maintained by extending the arrangement of the embossed portions 7 in a grid pattern. Is trained in. As a result, the intermediate layer 3 has high shape recovery when deformed. As a result, in the panty liner 10, multiple folds between the surface sheet 1 and the intermediate layer 3 are less likely to occur.

The embossed portions 7 arranged in a grid pattern may be applied from either the skin contact surface side or the non-skin contact surface side of the intermediate layer 3, but the liner 10 is sufficiently suppressed from being repeatedly broken. From the viewpoint, it is preferably at least on the skin contact surface side of the intermediate layer 3. At this time, the repulsive drag force and the shape recovery force of the intermediate layer 3 by the embossed portions 7 arranged in a grid pattern can act so as to further increase the shape recovery force of the ridge structure 6 of the surface sheet 1.

In addition, the embossed portions 7 arranged in a grid pattern serve as a diffusion path for the liquid because they are on the skin contact surface side of the intermediate layer 3. This is because the embossed portion 7 is recessed in the thickness direction, and the fiber density is higher than that of the other portions by squeezing, so that the capillary force acts strongly. As a result, the excrement liquid rapidly permeated in a wide range in the vertical direction (Y direction) by the ridge structure 6 of the surface sheet 1 reaches the skin contact surface side of the intermediate layer 3 in the vertical direction (Y direction). It diffuses diagonally with respect to the direction) and the lateral direction (X direction). As a result, the excrement liquid is absorbed and held in a wide area of the intermediate layer 3, and the absorption performance of the panty liner 10 is fully exhibited.
Further, this coordinated liquid absorption and retention is achieved by effectively suppressing wrinkles and multiple folds by combining the surface sheet 1 having the ridge structure 6 and the intermediate layer 3 having the embossed portions 7 arranged in a grid pattern. , Can be expressed more effectively and persistently during wearing.

In the present embodiment, the embossed portion 7 is arranged at the same position on the skin contact surface side of the intermediate sheet 32 and the non-skin contact surface side of the absorber 31. The intermediate sheet 32 and the absorber 31 are integrated by the embossed portions 7 on both sides. As a result, the flexible axis in the oblique direction with respect to the lateral direction (X direction) becomes clearer, and the drag force and the shape recovery force that repel the compression of the intermediate layer 3 from the lateral direction (X direction) described above are further enhanced. ..

As described above, when the intermediate layer 3 is composed of a plurality of layers, it is preferable that the embossed portion 7 is arranged at least on the skin contact surface side of the layer closest to the skin contact surface side. The layers other than the layer closest to the skin contact surface side may have no embossed portion 7, or may have an embossed portion 7 arranged for each layer. As for the layers other than the layer closest to the skin contact surface side, the embossed portion 7 may be provided on either the skin contact surface side or the non-skin contact surface side. However, from the viewpoint of more effectively suppressing multiple folding, it is more preferable that the embossed portion 7 connects two or more layers, and it is more preferable that the entire intermediate layer 3 is integrated in the thickness direction.

Next, a preferable relationship between the ridge structure 6 of the surface sheet 1 and the embossed portions 7 arranged in a grid pattern of the intermediate layer 3 will be described.
The pitch P1 of the ridge structure 6 (the spacing between the ridges 4 or the spacing between the grooves 5) is the diagonal length P2 in the lateral direction (X direction) of the embossed portions 7 arranged in a grid pattern of the intermediate layer 3. It is preferably shorter than that (see FIG. 2 (A) and FIG. 3). The diagonal length P2 referred to here means the distance between the vertices 71 arranged in the horizontal direction (X direction) in the quadrangle formed by the arrangement of the embossed portions 7. Since the pitch P1 of the ridge structure 6 is shorter than the diagonal length P2, the flexible axis of the surface sheet 1 increases. As a result, it is possible to more effectively suppress fine wrinkle creases on the surface of the surface sheet, which could not be prevented by simply arranging the embossed portion in the intermediate layer.

Further, the surface sheet 1 and the skin side surface of the intermediate layer 3 are preferably joined by heat fusion or hot melt, and more preferably by heat fusion. In the present embodiment, the surface sheet 1 and the intermediate sheet 32 are joined by heat fusion. Further, since the intermediate sheet 32 and the absorber 31 are joined by the embossed portion 7, the surface sheet 1, the intermediate sheet 32 and the absorber 31 are integrated. As the heat fusion method, various commonly used methods can be adopted, and examples thereof include thermal embossing and ultrasonic embossing. As a result, the surface sheet 1 and the skin side surface of the intermediate layer 3 are not easily peeled off even during liquid absorption, and the ability of the surface sheet 1 to suppress the occurrence of wrinkles is maintained higher. In particular, it is preferable that the groove portion 5 of the surface sheet 1 has a portion joined to the embossed portion 7 of the intermediate layer 3 from the viewpoint of preventing various twists. Further, the portion where the groove portion 5 of the surface sheet 1 is joined to the embossed portion 7 of the intermediate layer 3 (the portion where the groove portion 55 is inserted into the embossed portion 7 and is joined as shown in FIG. 3) is other than the intermediate layer 3. The fiber density is higher than that of the portion, which is preferable because it can contribute to the improvement of the liquid permeability from the surface sheet 1 to the intermediate layer 3. In addition, the transfer path of excretory fluid can be shortened, enabling rapid fluid absorption and retention. Further, from the viewpoint of liquid permeability, it is preferable that the joints by heat fusion are arranged intermittently in the vertical direction and the horizontal direction.

The ridge structure 6 of the surface sheet 1 preferably has the following fiber density structure.
As described above, the ridge structure 6 is formed by arranging the ridges 4 and the grooves 5 alternately in the lateral direction (X direction). As shown in FIG. 4, the surface sheet 1 has a thickness from the ridge portion 4 to the groove portion 5 due to the unevenness formed by the ridge groove structure 6. In such a ridge groove structure 6, the thickness is divided into three equal parts in the thickness direction, and the top 41 of the ridge 4 on the most skin side, the bottom 51 of the groove 5 on the most non-skin side, and the intermediate portion 61 connecting the two are separated. In some cases (see FIG. 4), it is preferable that the fiber density of the intermediate portion 61 is smaller than the fiber density of the top portion 41 of the ridge portion 4 and the bottom portion 51 of the groove portion 5. As a result, the ridge structure 6 becomes more movable with the intermediate portion 61 as the flexible shaft, and the occurrence of wrinkles can be suppressed more effectively against various external forces. In addition, in the intermediate portion 61 having a low fiber density, the permeation resistance of the excrement liquid is smaller than that of the top portion 41 of the ridge portion 4 and the bottom portion 51 of the groove portion 5. Therefore, the intermediate portion 61 can contribute to rapid liquid transfer even when the surface sheet 1 is subjected to an external force. The method for measuring the fiber density is as follows.

[Method of measuring fiber density at top 41, bottom 51 or middle 61]
The non-woven fabric is cut using a feather sword (product number FAS-10, manufactured by Feather Safety Razor Co., Ltd.), and the fiber density at the top 41 is above when the thickness of the cut surface of the non-woven fabric is divided into three equal parts in the Z direction. The vicinity of the apex of the apex 41, which is the site of the above, is magnified and observed using a scanning electron microscope (adjusted to a magnification capable of measuring 30 to 60 fiber cross sections; 150 to 500 times), and per fixed area (0.5 mm ² ). The number of cross sections of the fiber cut by the cut surface is counted. Next, it is converted into the number of cross sections of fibers per 1 mm ² , and this is used as the fiber density at the top 41. The measurement is performed at three points, and the fiber density of the sample is averaged. Similarly, the fiber density at the bottom portion 51 is determined by measuring the vicinity of the bottom point of the bottom portion 51, which is a lower portion when the thickness of the cut surface of the non-woven fabric is divided into three equal parts in the Z direction. Similarly, the fiber density of the intermediate portion 61 is determined by measuring the central portion when the thickness of the cut surface of the non-woven fabric is divided into three equal parts in the Z direction. As the scanning electron microscope, JCM-5100 (trade name) manufactured by JEOL Ltd. is used.

Further, as shown in FIG. 4, it is preferable that the inside of the ridge portion 4 of the surface sheet 1 is hollow (hereinafter, also referred to as a hollow portion). This hollow portion serves as a space between the ridge portion 4 and the intermediate layer 3 on the non-skin contact surface side. As a result, the surface sheet 1 becomes more flexible in movement using the flexible shaft due to the ridge structure 6, and wrinkles can be suppressed. Further, the hollow portion of the ridge portion 4 serves as a buffer region for the excrement liquid permeated from the surface sheet 1, and is effective in suppressing liquid return. Further, the hollow portion of the ridge portion 4 can promote the diffusion of the excrement liquid in the vertical direction (Y direction) together with the embossed portion 7.

As the material of the surface sheet 1, as long as it has liquid permeability, those usually used for this kind of article can be adopted without particular limitation. Considering the softness to the touch, a hydrophilic non-woven fabric is preferable, a thermal bond non-woven fabric is more preferable, and an air-through non-woven fabric is particularly preferable. It is preferable that the thermoplastic resin fiber is hydrophilized and the fiber is three-dimensionally crimped such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, cut to a predetermined length, and coated with various hydrophilic agents before forming staples. Examples of the hydrophilizing agent include various alkyl sulfonates typified by α-olefin sulfonate, acrylate, acrylate / acrylamide copolymer, ester amide, ester amide salt, polyethylene glycol and its derivatives, and water-soluble. A hydrophilization treatment with a commonly used hydrophilizing agent such as a sex polyester resin, various silicone derivatives, various sugar derivatives, and a mixture thereof can be used.

The ridged groove structure 6 of the surface sheet 1 can be formed by various methods used for this kind of article. For example, when forming the air-through non-woven fabric, a support corresponding to the ridges may be used to shape the fibers with hot air, or the fibers may be sorted by a water flow. Further, after the non-woven fabric is formed, the pair of tooth groove rolls may be meshed with each other to form a shape. When a tooth groove roll is used, for example, there is a method described in paragraphs [0048] to [0065] of JP-A-2016-79529. By this tooth groove processing, it is easy to form a structure in which the fiber density of the intermediate portion 61 is smaller than the fiber density of the top portion 41 of the ridge portion 4 and the bottom portion 51 of the groove portion 5. The material of the non-woven fabric to be grooved preferably contains the high elongation fibers described in paragraphs [0016] to [0028] of the same document.

As the material of the intermediate layer 3, the material used for this kind of article can be adopted without particular limitation.
From the viewpoint of forming the embossed portions 7 arranged in a grid pattern as described above and forming a good bond between the surface sheet 1 and the intermediate layer 3 by heat fusion, the intermediate layer 3 forms the heat-sealing fibers. It is preferable to include it. The heat-sealing fibers are preferably hydrophilic. Examples of the heat-sealing fiber include polyethylene fiber and polypropylene fiber, polyethylene terephthalate and polyethylene, and a composite fiber having a core-sheath structure or a side-by-side structure in which polypropylene and polyethylene are combined.

The intermediate layer 3 preferably contains heat-shrinkable fibers. As a result, the elasticity and shape recovery of the intermediate layer 3 are enhanced, and it becomes difficult to twist. The heat-shrinkable fiber is a fiber that exhibits shrinkage such as crimping by heat treatment. Examples of the raw material fibers to be heat-treated include those composed of eccentric core sheath type or side-by-side type composite fibers containing two types of thermoplastic polymer materials having different shrinkage rates.

As the intermediate sheet 32 constituting the intermediate layer 3 of the present embodiment, a material that is usually used can be used, and a material having hydrophilicity and excellent liquid diffusivity is preferable. As described above, it is preferably made of a non-woven fabric from the viewpoint of increasing the restoring force against compression. It is more preferable to include the above-mentioned heat-sealing fibers and heat-shrinking fibers. As the non-woven fabric, a non-woven fabric obtained by various manufacturing methods can be used. For example, an air-through non-woven fabric in which heat fusion points between fibers are formed on a fiber web obtained by the card method or the airlaid method by an air-through method, and a heat fusion point between fibers is formed on a fiber web obtained by the card method by a heat roll method. Various non-woven fabrics such as heat-rolled non-woven fabric, heat-embossed non-woven fabric, spunlaced non-woven fabric, needle punched non-woven fabric, and resin-bonded non-woven fabric can be used.

As the absorber 31 constituting the intermediate layer 3, those used for this kind of article can be adopted without particular limitation as long as they have liquid retention. It is more preferable to include the above-mentioned heat-sealing fibers and heat-shrinking fibers. As a result, even when the absorber 31 swells while absorbing and holding the excrement liquid, it is possible to suppress the shape loss and improve the shape retention and shape recovery with respect to an external force.
Examples of the absorber 31 include a configuration consisting of an absorbent core and a core wrap sheet that covers the outer periphery, an absorbent sheet in the form of a thin sheet, and the like. As the absorber 31 of the panty liner 10, an absorbent sheet in the form of a thin sheet is preferable. Examples of the material that absorbs and retains the liquid in the absorber 31 include hydrophilic fibers such as pulp, cotton, rayon, and lyocell, and a super absorbent polymer (SAP). However, when a super absorbent polymer (SAP) is contained, a hard portion is formed in the absorber 31, and that portion can serve as a break base point. Therefore, from the viewpoint of preventing multiple folding of the intermediate layer 3, it is preferable that the super absorbent polymer (SAP) is not contained. In this case, examples of the absorbent sheet for the panty liner include an air-laid non-woven fabric formed by using pulp fibers and a spunlace non-woven fabric formed by water flow entanglement using hydrophilic fibers and pulp fibers. The absorber 31 may be made of one absorbent sheet, may be a laminated one of a plurality of absorbent sheets, or may be a laminated one by folding one absorbent sheet.

In the panty liner 10, the thickness of the absorber 31 is preferably 0.1 mm or more and 3 mm or less, and more preferably 0.3 mm or more and 2 mm or less. The thickness of the absorber 31 can be measured by the following method.
The thickness T is measured using a peacock type precision measuring instrument (model R1-C), which is a micrometer having two parallel pressure surfaces (fixed pressure surface and movable pressure surface). The diameter of the movable pressurizing surface of the stylus is 5 mm, and the pressure is 100 kPa or less. The size of the test piece for measurement shall be at least the size of the plate below. A 20 mm × 20 mm plate (mass 5.4 g) is placed on the test piece, the stylus movable pressure surface is operated at a speed of 2 mm / s, and the plate is applied to the plate to read the value immediately after stabilization. The pressure between the pressure surfaces (pressure applied to the test piece) shall be 1.3 kPa or less.

As the back surface sheet 2, as long as it has liquid impermeability, those used for this kind of article can be adopted without particular limitation. For example, a hydrophobic thermoplastic resin and a minute inorganic filler made of calcium carbonate or the like, an incompatible organic polymer, or the like are melt-kneaded to form a film, and the film is uniaxially or biaxially stretched. The porous film to be used is mentioned. Examples of the thermoplastic resin include polyolefins. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

1 Front sheet 2 Back sheet 3 Intermediate layer 31 Absorber 32 Intermediate sheet 4 Ridge 41 Ridge top 5 Groove 51 Groove bottom 6 Ridge structure 61 Intermediate 7 Embossed 10 Panty liner

Claims (11)

It has a front surface sheet on the skin contact surface side, a back surface sheet on the non-skin contact surface side, and an intermediate layer arranged between the front surface sheet and the back surface sheet, and has a ventral side, a crotch part, and a wearer. An absorbent article having a vertical direction arranged along a direction connecting the dorsal portions and a horizontal direction orthogonal to the vertical direction.
The surface sheet has a ridge groove structure in which ridges and grooves extending in the vertical direction are arranged alternately in the horizontal direction at least in the center of the horizontal direction, and the inside of the ridges is hollow. ,
The intermediate layer includes a liquid-retaining absorber and an intermediate sheet that covers the skin contact surface side of the absorber, and is arranged in a grid pattern extending diagonally with respect to the vertical direction and the horizontal direction. have a embossed portion,
The embossed portions of the intermediate layer arranged in a grid pattern extending in an oblique direction form a side composed of a quadrangular apex surrounding an area where the embossed portion is not arranged inside and a series of a plurality of embossed portions in a plan view. The quadrangles are connected and regularly arranged, and the adjacent quadrangles share vertices and sides.
Wherein the groove of the topsheet that have a joint comprising enters the embossed portions arranged in a grid of the intermediate layer, the absorbent article. The absorbent article according to claim 1, wherein the embossed portions arranged in a grid pattern are present on the skin contact surface side of the intermediate layer. The absorbent article according to claim 1 or 2, wherein the pitch between the ridges and the grooves of the surface sheet is shorter than the horizontal diagonal length of the embossed portions arranged in a grid pattern in the intermediate layer. Claims 1 to 3 that, in the ridge groove structure of the surface sheet, the density of the intermediate portion connecting the top of the ridge and the bottom of the groove is smaller than the density of the top of the ridge and the bottom of the groove. The absorbent article according to any one of the above. The absorbent article according to any one of claims 1 to 4, wherein the intermediate sheet and the absorber are joined by embossed portions arranged in a grid pattern. Any one of claims 1 to 5, wherein the embossed portions arranged in a grid pattern are arranged at the same positions on the skin contact surface side of the intermediate sheet and the non-skin contact surface side of the absorber. the absorbent article according to. The absorbent article according to any one of claims 1 to 6 , wherein the intermediate sheet is made of a non-woven fabric. The absorbent article according to any one of claims 1 to 7 , wherein the absorber does not contain a super absorbent polymer material. The absorbent article according to any one of claims 1 to 8 , wherein the intermediate layer contains heat-sealed fibers. The absorbent article according to any one of claims 1 to 9 , wherein the intermediate layer contains heat-shrinkable fibers. The absorbent article according to any one of claims 1 to 10 , wherein the surface sheet and the intermediate layer are joined by heat fusion.

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