JP2020036737A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of achieving both of high adhesion to an excretion port of a wearer and good wearing feeling.SOLUTION: The absorbent article comprises a top sheet disposed on a skin side of a wearer, a back sheet disposed on a non-skin side, and an absorber having an absorbent core and disposed between the top sheet and the back sheet, and has a longitudinal direction corresponding to the front/back direction of the wearer and a lateral direction orthogonal to the longitudinal direction. The absorbent core includes: a front core portion and a back core portion located at both ends in the longitudinal direction; an intermediate core portion located between the front core portion and the back core portion and constricted to be narrower than the front core portion and the back core portion; and a central external force buffer portion that is formed at least in the lateral center portion of the intermediate core portion and extends in the longitudinal direction.SELECTED DRAWING: Figure 1

Description

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

  2. Description of the Related Art Conventionally, there has been known an absorbent article having a configuration in which an absorber is guided so as to protrude and bend toward the skin side. For example, Patent Literature 1 describes an absorbent article provided with an absorber having a bent line that guides to bend by protruding toward the skin side in the thickness direction. Patent Literature 2 discloses an absorbent article including an absorber having a bending guide portion that guides the skin to bend toward the skin side. An absorbent article, which is a compressed part having, is described. Further, Patent Documents 3 and 4 disclose an absorbent body having a plurality of low-basis-weight grooves extending in the absorbent core so as to intersect vertically and horizontally, and having a block-shaped protruding absorbent portion.

Japanese Patent No. 5978341 Japanese Patent No. 6089078 Japanese Patent No. 5711523 Japanese Patent No. 5688530

  In the absorbent articles described in Patent Literatures 1 and 2, when a large external force is applied in the direction of being compressed from the lateral direction, the absorber is bent sharply toward the skin side, and the adhesion to the excretory part is insufficient. In addition, it may cause discomfort and discomfort when worn.

  The absorbent articles described in Patent Literatures 3 and 4 make it easier for the wearer to deform the absorber against external forces applied to the absorbent core from various directions as compared with the absorbent articles described in Patent Literatures 1 and 2. It has high fit to skin. However, since the excretion opening facing region of the absorbent core is thicker than the peripheral region, that is, it does not have a so-called middle-high structure, there is room for improvement in terms of adhesion to the excretion opening.

  An object of the present invention is to provide an absorbent article that can achieve both high adhesion to the excretion opening of a wearer and a good feeling of wearing.

The absorbent article according to one embodiment of the present invention has a topsheet disposed on the skin side of the wearer, a backsheet disposed on the non-skin side, and an absorbent core, wherein the topsheet and the backsheet have an absorbent core. And an absorbent body disposed therebetween, and has a vertical direction corresponding to the front-rear direction of the wearer and a horizontal direction orthogonal to the vertical direction.
The absorbent core,
A front core portion and a rear core portion located at both ends in the vertical direction,
An intermediate core portion, which is located between the front core portion and the rear core portion, and is narrower than the front core portion and the rear core portion. It does not have a protruding part thicker than its surrounding area at the transverse center that is orthogonal,
A central external force buffer formed at least in the lateral center of the intermediate core and extending in the longitudinal direction.

  As described above, according to the absorbent article of the present invention, it is possible to achieve both high adhesion to the excretion opening of the wearer and good wearing feeling.

It is a top view showing the absorptive article concerning a 1st embodiment of the present invention. It is sectional drawing of the said absorbent article cut | disconnected by the II-II line of FIG. It is a top view which shows the absorbent core of the said absorbent article. It is a figure which shows the structure at the time of wearing of the said absorbent article typically. It is a top view showing the absorptive article concerning a 2nd embodiment of the present invention. It is a top view showing other examples of composition of an absorptive article concerning a 2nd embodiment of the present invention. It is a top view showing the absorptive article concerning a 3rd embodiment of the present invention. It is a top view showing the absorptive article concerning a 4th embodiment of the present invention. It is a figure which shows typically the structure at the time of wearing in the back part of the said absorbent article. It is a top view showing other examples of composition of an absorptive article concerning a 4th embodiment of the present invention. It is a top view showing the absorptive article concerning a 5th embodiment of the present invention. It is a top view showing the absorptive article concerning a 6th embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Overall composition of napkin]
The absorbent article 1 shown in FIG. 1 includes a main body M, a pair of wing portions W, and a pair of rear flap portions F. The absorbent article 1 is configured as a sanitary napkin, and is hereinafter referred to as a napkin 1.
The napkin 1 has a vertical direction X corresponding to the front-back direction of the wearer and a horizontal direction Y corresponding to the left-right direction of the wearer and orthogonal to the vertical direction X. Further, the napkin 1 has a thickness direction Z orthogonal to both the vertical direction X and the horizontal direction Y. With respect to the thickness direction Z, the side closer to the wearer's skin when worn is also referred to as “skin side” or “upper”, and the side closer to clothing is referred to as “non-skin side” or “lower”. Further, the upper part in the thickness direction Z may be referred to as “skin direction Z1”, and the lower part in the thickness direction Z may be referred to as “non-skin direction Z2”.
The napkin 1 may be used at bedtime, and may have a length of 30 cm or more along the vertical direction X, for example.

  The main body M extends along the vertical direction X, and is fixed to the inner surface of the wearer's clothes when worn. The main body M has an absorber 11 described later, and has a function of absorbing a liquid material such as menstrual blood of a wearer (hereinafter, also referred to as “liquid”).

The wing portion W is configured to largely protrude outward in the lateral direction Y from the main body M.
The rear flap portion F is configured to bulge outward in the lateral direction Y at the rear portion of the main body M.
Note that the napkin 1 may not have at least one of the wing portion W and the rear flap portion F.

  As shown in FIG. 2, the napkin 1 includes an absorber 11, a top sheet 12, a back sheet 13, and a pair of side sheets 14. In the main body M, the napkin 1 has a configuration in which the back sheet 13, the absorber 11, and the top sheet 12 are stacked in the thickness direction Z. These components are appropriately joined and integrated, for example, by joining with an adhesive or a heat seal, or by embossing with a compressed groove described later.

The absorber 11 extends in the longitudinal direction X and is disposed between the top sheet 12 and the back sheet 13. The absorber 11 absorbs the liquid from the surface on the side of the top sheet 12, diffuses the liquid inside, and holds the liquid.
The absorber 11 has an absorbent core 16 and a core wrap sheet 17.
The absorbent core 16 may be formed of, for example, a fiber aggregate formed of hydrophilic fibers such as pulp fibers, or may have a configuration in which the fiber aggregate holds a water-absorbing polymer. .
The core wrap sheet 17 has a function of covering the absorbent core 16 and maintaining the shape of the absorbent core 16, for example. The core wrap sheet 17 is formed of, for example, a thin soft paper such as a tissue paper or a liquid-permeable nonwoven fabric.
Details of the absorber 11 will be described later.

  The topsheet 12 is configured as a liquid-permeable sheet material, and is disposed above the absorber 11 in the thickness direction Z (skin side). In addition, between the topsheet 12 and the absorber 11, the liquid permeability from the topsheet 12 to the absorber 11 is improved, and the liquid absorbed by the absorber 11 is prevented from returning to the topsheet 12. From the viewpoint, a second sheet (sub-layer sheet) may be arranged.

The back sheet 13 is disposed below the absorber 11 in the thickness direction Z. The back sheet 13 is joined to the top sheet 12 and the side sheet 14 by an adhesive, a heat seal, or the like, for example, at the peripheral edge. The back sheet 13 may be joined to the absorber 11 with an adhesive or the like.
The back sheet 13 is formed of, for example, a sheet material having functions such as poor liquid permeability, water vapor permeability, and water repellency. As the sheet material, for example, a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used.

  An adhesive portion 15 is provided on the outer surface of the back sheet 13. The adhesive portion 15 has a function as a slip stopper for fixing the napkin 1 to clothing, and is formed, for example, by applying an adhesive such as a hot melt adhesive to the back sheet 13. As shown in FIG. 2, the adhesive portion 15 is provided on the main body M and the wing portion W, and may also be provided on the rear flap portion F.

  The pair of side sheets 14 are arranged on the peripheral edge of the napkin 1 in the lateral direction Y, and face each other in the lateral direction Y with the top sheet 12 interposed therebetween. The side sheet 14 is joined to the top sheet 12 with an adhesive or the like at an end inward in the lateral direction Y. The inner end in the lateral direction Y of the side sheet 14 is not limited to the example of FIG. 2, and may be fixed by being folded outward. Alternatively, an elastic member that can expand and contract in the vertical direction X is attached to the end, and a three-dimensional gather that rises from the top sheet 12 side when worn may be formed.

[Configuration of absorbent core]
As shown in FIG. 3, the absorbent core 16 has a front core section 20, an intermediate core section 21, and a rear core section 22. The front core section 20, the intermediate core section 21, and the rear core section 22 are arranged along the vertical direction X. That is, the front core section 20 and the rear core section 22 are located at both ends in the vertical direction X, and the intermediate core section 21 is located between the front core section 20 and the rear core section 22. The intermediate core portion 21 is a region facing the excretion region of the wearer, and the front core portion 20 and the rear core portion 22 are portions facing the front and rear of the excretion region of the wearer, respectively. The absorbent core 16 has a symmetrical planar shape in the horizontal direction Y.

The intermediate core portion 21 is configured to be narrower than the front core portion 20 and the rear core portion 22, and has a shape constricted from the left and right. The intermediate core portion 21 has a width D2 smaller than the width D1 of the front core portion 20 and the width D3 of the rear core portion 22.
The width D2 of the intermediate core portion 21 refers to the minimum width dimension in the horizontal direction Y. The width D1 of the front core portion 20 and the width D3 of the rear core portion 22 refer to the maximum width dimension in the lateral direction Y.
Since the absorbent core 16 has the narrow intermediate core portion 21, when both legs of the wearer are closed and the crotch width is reduced, external force from the lateral direction Y applied to the intermediate core portion 21 is reduced. Can be.

The width D1 of the front core portion 20 and the width D3 of the rear core portion 22 may be the same or different, and have substantially the same dimensions in the example shown in FIG. Further, the length dimension of the front core portion 20 and the rear core portion 22 in the longitudinal direction X may be the same or different. For example, the rear core portion 22 is configured to be longer.
Note that “a constant width” in a certain region means that, when the minimum width in the lateral direction Y of the region is set to 100%, the difference in the width dimension in the region falls within 20% or less.

  In the example illustrated in FIG. 3, the intermediate core portion 21 includes a narrow portion 21a having a constant width D2 along the longitudinal direction X, and a tapered portion 21b located in front of and behind the narrow portion 21a. Having. The tapered portion 21b is a region whose width gradually increases toward the front core portion 20 and the rear core portion 22. Note that the intermediate core portion 21 may not have the tapered portion 21b, and the width between the front core portion 20 and the rear core portion 22 may be discontinuously changed.

[Configuration of central external force buffer]
As shown in FIG. 3, the absorbent core 16 has a central external force buffer 23 formed on the intermediate core 21 and promoting standing in the skin direction Z1.

The central external force buffer 23 extends in the vertical direction X, and is located, for example, at the center in the horizontal direction Y.
The central portion in the lateral direction Y refers to a central region when the narrowest portion of the intermediate core portion 21 is equally divided into three in the lateral direction Y. Typically, the central external force buffer 23 is formed at a position that bisects the intermediate core 21 in the lateral direction Y.
The central external force buffer 23 only needs to be formed at least in the intermediate core portion 21, and in this embodiment, both the starting point and the end point in the vertical direction X are located in the intermediate core portion 21.

  The central external force buffer 23 is provided at a central portion in the lateral Y direction so that any portion of the absorbent core 16 is not deformed under the influence of the external force when an external force is applied to the napkin 1 to compress the napkin 1 in the lateral direction Y. This is a configuration in which the absorbent core 16 is processed so as to have a convex shape or a concave shape in the skin direction Z1. The specific form of the central external force buffer 23 may be a folding habit formed on the absorbent core 16 in a manufacturing stage, a concave formed by pressing, a low-basis concave, a slit, or the like. The central external force buffer 23 may be a groove-shaped structure that continuously extends in the vertical direction X, or may be a region in which a plurality of point-shaped recesses are formed, as examples including the recesses. The “point-like” is a region having a predetermined shape and area formed around an arbitrary point, and the shape is not limited to a circle, an ellipse, a polygon, or the like.

  The width d of the central external force buffer 23 is preferably 2 mm or more and 10 mm or less, more preferably 4 mm or more and 7 mm or less, from the viewpoint of effectively promoting standing in the skin direction Z1. The width d of the central external force buffer 23 is a dimension in the lateral direction Y in a state where the absorbent core 16 is stretched on the XY plane. More specifically, the width d in the case where the central external force buffering portion 23 has a kinks is a dimension in the lateral direction Y of a region where the kinks are attached. The width d when the central external force buffer 23 is groove-shaped is the groove width on the surface of the absorbent core 16. The width d in the case where the central external force buffer 23 is a region where a point-like concave portion is formed is a dimension in the lateral direction Y of the region where the concave portion is formed.

The synergistic action of the central external force buffer 23 and the narrow intermediate core 21 will be described with reference to FIG.
In a napkin that does not have a so-called middle-high structure, when an external force is applied in the lateral direction Y, the absorbent core is easily deformed at an arbitrary location due to the wearing state and the posture of the wearer. On the other hand, the napkin 1 of the present embodiment does not have a so-called middle and high portion, which is thicker than its periphery, in the center of the intermediate core portion 21 in the lateral direction Y, and has a central external force buffer portion 23. Therefore, as shown in FIG. 4, when an external force is applied from the lateral direction Y (see a white arrow in the figure), the external force is easily transmitted to the central external force buffer 23 in the napkin 1, and the central external force buffer 23 is When the intermediate core portion 21 is deformed as an opportunity, undesired deformation in a surrounding area is easily suppressed. At this time, the central external force buffer 23 may be deformed so as to protrude in the skin direction Z1 as shown in FIG. 4, or if the central external force buffer 23 is a groove as described later, It may be deformed so that the width becomes narrow.

  Further, in the above configuration, the intermediate core portion 21 is narrower than the front core portion 20 and the rear core portion 22, and the central external force buffer 23 extending in the vertical direction X is formed on the intermediate core portion 21. ing. Due to this narrow constriction structure, the external force in the lateral direction Y applied to the intermediate core portion 21 is reduced. In addition, the front core portion 20 and the rear core portion 22 are separated in the vertical direction X by the constricted region of the intermediate core portion 21, so that the deformation of the central portion of the intermediate core portion 21 in the horizontal Y direction is less likely to be restricted. ing. Furthermore, since the intermediate core portion 21 is connected to the front core portion 20 and the rear core portion 22 in the central portion in the lateral direction Y, the intermediate core portion 21 deformed in the thickness direction Z can easily maintain a gentle slope. Become. For example, when the central external force buffer 23 rises in the skin direction Z1, an inclined surface where the intermediate core portion 21 easily adheres to the skin around the excretion opening from the excretion opening is formed while restricting the rising height. Can be. On the other hand, when the central external force buffer 23 is a groove, the central part in the lateral direction Y of the intermediate core part 21 has a gentle slope toward the excretion port while deforming to reduce the groove width. , So that good adhesion can be obtained similarly. Therefore, with the central external force buffer 23 of the intermediate core 21 and the narrow structure, it is possible to realize a gentle convex shape along the depression of the excretion area, and the napkin 1 has high adhesion to the excretion opening. , And a good feeling of wearing without discomfort.

[Additional description of this embodiment]
Hereinafter, the description of the present embodiment will be supplemented.

(Width of each part of the absorbent core)
The widths D1 and D3 of the front core portion 20 and the rear core portion 22 are preferably 60 mm or more and 100 mm or less, and more preferably 70 mm or more and 90 mm or less.
The width D2 of the narrow portion 21a of the intermediate core portion 21 is preferably 35 mm or more and 75 mm or less, and more preferably 40 mm or more and 70 mm or less.

(Block structure of absorbent core)
As shown in FIG. 3, the absorbent core 16 is divided into a block shape by a plurality of vertical grooves 24 extending along the vertical direction X and a plurality of horizontal grooves 25 extending along the horizontal direction Y. The vertical groove portion 24 and the horizontal groove portion 25 are configured as grooves configured to have a lower basis weight than their surroundings.
The vertical groove 24 may be formed at a position overlapping the central external force buffer 23 in plan view. In this case, the central external force buffer 23 has a configuration such as a folding habit and a recess provided separately from the vertical groove 24.
It is sufficient that at least a part of the vertical groove 24 extends along the vertical direction X, and a part of the vertical groove 24 may be curved as shown in FIG. Similarly, at least a part of the lateral groove 25 may be extended along the lateral direction Y.

(Thickness of absorbent core)
The intermediate core portion 21 does not have a so-called “middle-high structure”. That is, there is no region in the center in the lateral direction Y that is thicker than the peripheral region and protrudes toward the skin so that the region is close to the wearer's skin. More specifically, the center portion of the intermediate core portion 21 in the width direction Y has a structure that is thicker than the front core portion 20 and the rear core portion 22 so as to be in close contact with the wearer's skin. Absent. However, the thickness does not need to be completely the same as the front core portion 20 and the rear core portion 22, and the thickness difference ([thickness of the intermediate core portion 21-thickness of the front core portion 20 or the rear core portion] / front thickness) The thickness of the intermediate core portion 21 may be thicker within a range of 25% or less, preferably 15% or less, of the core portion 20 or the rear core portion 22.
The dimension of the intermediate core portion 21 in the thickness direction Z can be set in consideration of the basis weight. For example, the thickness dimension is preferably 1 mm or more and 7 mm or less, more preferably 2 mm or more and 5 mm or less from the viewpoint of ease of standing.

(Basis weight of absorbent core)
The basis weight of the absorbent core 16 excluding the vertical groove portion 24 and the horizontal groove portion 25 is preferably 90 g / m ² or more and 700 g / m ² or less, more preferably 100 g / m ² or more and 500 g / m ² or less.

(Method of measuring the basis weight of the absorbent core)
The measurement target area of the absorbent core 16 is cut using a single-edged razor manufactured by Feather Co., Ltd. to obtain a small piece having a predetermined area. The weight of these small pieces is measured using an electronic balance (an electronic balance GR-300 manufactured by A & D, precision: 4 digits after the decimal point). The calculated weight is divided by the area of the small piece of each part to calculate the basis weight of the small piece. For each part, the average of the basis weights of the five small pieces is defined as the basis weight.

(Method of measuring thickness of absorbent core)
The thickness of the small piece to be measured is measured by measuring the thickness of the small piece cut out for measuring the basis weight described above. An aluminum plate having a diameter of 25 mm, a thickness of 3 mm, and a weight of 2.45 g is gently placed on the measurement surface on a small piece cut out from the absorbent core, and is placed on the measurement surface. G30, displacement meter LK-GD500), and the thickness of the sample is measured. When the size of the cut small piece is small and it is difficult to measure it with a non-contact laser displacement meter, the cross section of the cut sample is measured for 20 to 100 using a microscope (VHX-1000 manufactured by KEYENCE). Observation may be performed at a magnification of x, and the measurement may be performed. The “substantially no load state” means that an acrylic plate is flatly arranged on the sample surface in order to specify the upper end portion of the sample, and does not mean that there is no load at all.

<Second embodiment>
The central external force buffer 23 is not limited to the configuration formed only on the intermediate core 21, and may extend over substantially the entire length of the absorbent core 16, for example.

As shown in FIG. 5, the central external force buffer 23 is located at the center in the horizontal direction Y of the absorbent core 16, and extends in the vertical direction X from the front core 20 to the rear core 22.
“The central external force buffer 23 extends in the vertical direction X from the front core 20 to the rear core 22” means “from the starting point located in the front core 20 through the intermediate core 21 to the inside of the rear core 22. Means a configuration extending to the end point located at.

In the present embodiment, as shown in FIG. 5, the central external force buffer 23 extends from the front end of the front core 20 to the rear end of the rear core 22 over the entire length X in the longitudinal direction of the absorbent core 16. Part.
Alternatively, as shown in FIG. 6, the central external force buffer 23 may extend from a starting point located in the front core section 20 to an end point located in the rear core section 22 through the intermediate core section 21.

  According to the above configuration, the central external force buffer 23 is formed through the intermediate core 21, and the convex shape of the central external force buffer 23 in the intermediate core 21 is easily maintained. Therefore, even when external force is easily applied to the napkin 1 when worn for a long time, when exercising, or the like, a preferable convex shape is maintained, and a high fitting property and a good feeling of wearing in the excretion area can be maintained.

  Further, the absorbent core 16 can have a convex shape continuously from the front core portion 20 to the rear core portion 22 by the central external force buffer portion 23. For this reason, it becomes easy to follow the hollow of the body in the buttocks behind from the front of the excretion area of the wearer, and the fit can be further improved.

<Third embodiment>
The central external force buffer 23 may not have a constant width as a whole, but may have a different width for each part.

  That is, as shown in FIG. 7, the central external force buffering section 23 may be formed wider in the front core section 20 and the rear core section 22 than in the intermediate core section 21. The term “wider” in the front core portion 20 and the rear core portion 22 than in the intermediate core portion 21 means that the maximum width of the central external force buffer portion 23 in the front core portion 20 and the rear core portion 22 is equal to the width of the intermediate core. In this case, the width of the central external force buffer 23 in the portion 21 is larger than the minimum width.

More specifically, the central external force buffer 23 is divided into a wide front wide region 23a and a wide rear region 23c, and a narrow middle narrow region 23b. The width d1 of the front wide area 23a and the width d3 of the rear wide area 23c are configured to be larger than the width d2 of the intermediate narrow area 23b. In the example shown in FIG. 7, the front wide region 23a, the middle narrow region 23b, and the rear wide region 23c are formed with constant widths d1, d2, and d3, respectively.
Here, the “constant width” in the central external force buffer 23 and each of the regions means that, when the minimum width in the horizontal direction Y is 100%, the difference in the width dimension in the region is 11% or less. Means that

In the example shown in FIG. 7, the front wide region 23 a is formed from the front end side of the intermediate core portion 21 to the front core portion 20. Similarly, the rear wide region 23 c is also formed from the rear end side of the intermediate core portion 21 to the rear core portion 22.
The central external force buffer 23 in FIG. 7 is continuously formed in the vertical direction X between the front wide area 23a, the middle narrow area 23b, and the rear wide area 23c. However, the central external force buffer 23 may be divided and discontinuously formed between the front wide region 23a, the intermediate narrow region 23b, and the rear wide region 23c.

  In this configuration, since both sides of the rear core portion 22 are pressed by the skin around the buttocks in the buttocks during wearing, both sides of the rear wide region 23c are separated by the rear wide region 23c and are moved toward the skin direction Z1. Easy to stand up. Thereby, at the time of wearing, the rear core portion 22 stands up along the buttocks of the buttocks of the wearer and easily fits on the buttocks (see FIG. 9 described later). Therefore, it is possible to more effectively suppress forward and backward liquid leakage.

  Also, the intermediate core portion 21 can easily maintain the convex shape by the action of the central external force buffer portion 23 in the front core portion 20 and the rear core portion 22. Therefore, even when a load in the twisting direction is applied to the napkin 1 at the time of turning over, walking, or the like, the convex shape of the intermediate core portion 21 can be maintained, and good fit can be maintained.

  In addition, in the intermediate core portion 21, since the width of the central external force buffer portion 23 is relatively small, it is possible to suppress the convex shape from projecting too sharply. Thereby, a gentle convex shape can be maintained, and a good feeling of wearing can be maintained even during long-time use or operation.

  The widths d1 and d3 of the front wide region 23a and the rear wide region 23c of the central external force buffer 23 are preferably 3 mm or more and 16 mm or less, and more preferably 5 mm or more, from the viewpoint of effectively exhibiting the above-described effects. It is 12 mm or less. The width d2 of the intermediate narrow region 23b is preferably 2 mm or more and 10 mm or less, more preferably 3 mm or more and 7 mm or less. The widths d1 and d3 of the front wide region 23a and the rear wide region 23c with respect to the width d2 of the intermediate narrow region 23b are preferably larger than 1.0 times and 3 times or less, and more preferably 1.2 times or more. 2.5 times or less.

<Fourth embodiment>
As described above, in the absorbent core 16, the central portion in the lateral direction Y is guided by the central external force buffer 23 into a shape along the excretion region and the cleft behind the excretion region. On the other hand, it is preferable that the lateral Y side of the absorbent core 16 has a shape that wraps around the excretion area, buttocks and groin.
Therefore, as shown in FIG. 8, the absorbent core 16 may be formed on both sides in the horizontal direction Y of the central external force buffer 23, and may further include a lateral external force buffer 27 extending in the vertical direction X. Good.

  The side external force buffer 27 is configured to promote the depression of the rear core 22 in the non-skin direction Z2. When an external force is applied from the lateral direction Y, the absorbent core 16 is depressed in the non-skin direction Z2. This is a configuration that has been machined. The side external force buffer 27 is formed, for example, as a pair with the central external force buffer 23 interposed therebetween. Thereby, three ridge fold lines and valley fold lines along the vertical direction X are formed on the absorbent core 16 so as to be alternately arranged in the horizontal direction Y.

  As a specific mode of the side external force buffer 27, as in the case of the central external force buffer 23, a folding habit formed on the absorbent core 16 at the manufacturing stage may be used, or a pressed concave portion, a low basis weight, It may include a concave portion, a slit, or a pulp pile fiber missing portion.

  In the example shown in FIG. 8, the side external force buffer 27 is formed in the rear core 22. Thereby, the lateral Y side portion of the rear core portion 22 can be bent in a W-shape along the roundness of the buttocks.

The configuration of the rear core portion 22 when worn will be described in detail with reference to FIG.
The rear core portion 22 has a convex shape in the skin direction Z1 at the central portion in the lateral direction Y by the central external force buffering portion 23. As a result, the rear core portion 22 has a shape along the buttocks H1 of the buttocks H.
Further, in the rear core portion 22, the lateral Y side portion has a convex shape in the non-skin direction Z <b> 2 and is bent so that the lateral Y end portion 22 d faces the skin direction Z <b> 1 by the side external force buffering portion 27. Thereby, the whole rear core part 22 becomes W-shaped along the unevenness of the buttocks H. Therefore, at the time of bedtime or operation, the fitting property of the rear core portion 22 in which a gap is easily formed and which is easy to be distorted can be improved, and the leakage of the liquid can be effectively prevented.

As shown in FIG. 10, the side external force buffer 27 may be formed on at least one of the intermediate core 21 and the front core 20 in addition to the rear core 22.
For example, the side external force buffer 27 may be formed from the front core 20 to the rear core 22 through the intermediate core 21 in parallel with the central external force buffer 23. Thereby, the whole absorbent core 16 becomes a shape bent in a W-shape by an external force from the lateral direction Y. Therefore, the fit of the napkin 1 on the lateral Y side can be further improved, and the leakage of the liquid in the lateral Y can be effectively prevented.
In addition, the side external force buffer 27 is not limited to the configuration formed continuously in the vertical direction X. For example, the side external force buffer 27 may be discontinuously divided in the vertical direction X between the core portions of the absorbent core 16. Good. Further, the side external force buffer 27 may be provided in the rear core portion 22 and may not be provided in the front core portion 20.

<Fifth embodiment>
The side external force buffer is not limited to the configuration extending in the vertical direction X, and may extend in the horizontal direction Y as described below.

  That is, as shown in FIG. 11, the absorbent core 16 is formed on both sides in the lateral direction Y of the central external force buffer 23, extends in the lateral direction Y, and promotes standing in the non-skin direction Z2. A buffer 28 may be further provided. The side external force buffer 28 is configured so that the absorbent core 16 projects in the non-skin direction Z2 when an external force is applied from the vertical direction X. As a specific mode of the side external force buffer portion 28, similarly to the side external force buffer portion 28, a folding habit formed on the absorbent core 16 at the manufacturing stage may be used, or a pressed concave portion, a low basis weight, or the like. Of the pulp may be included.

  The side external force buffer portions 28 are formed on the rear core portion 22 and the front core portion 20, respectively. Each side external force buffer 28 is divided at the center in the lateral direction Y with the central external force buffer 23 interposed therebetween.

  The rear core portion 22 is formed in the rear core portion 22 so that the rear core portion 22 has a convex shape in the non-skin direction along the lateral direction Y, and is easily curved along the roundness of the buttocks in the front-rear direction. Become. Thereby, the gap between the back core portion 22 and the buttocks can be reduced, and the fit can be improved.

  By forming the side external force buffering portion 28 in the front core portion 20, the front core portion 20 has a convex shape in the non-skin direction along the lateral direction Y, and is steep from the front of the excretion area toward the abdomen. It is easier to follow a curved shape. Therefore, the fitting property of the front core portion 20 can be improved.

  Note that the side external force buffer 28 may be formed on one of the rear core 22 and the front core 20. Further, a plurality of side external force buffer portions 28 may be formed on each of the rear core portion 22 and the front core portion 20.

<Sixth embodiment>
As shown in FIG. 12, the napkin 1 may further include a compression groove 30 formed by compressing the absorber 11 in the thickness direction Z together with the topsheet 12. In the present embodiment, the positional relationship between the compressed groove 30 and the central external force buffer 23 is defined from the viewpoint of facilitating the guiding of the absorbent core 16 into a preferable shape when worn.

  As shown in FIG. 12, the compression grooves 30 form a pair in the intermediate core portion 21 and extend in the vertical direction X, respectively. The expression “the compression groove 30 extends in the vertical direction X” broadly includes a mode extending from the front to the rear of the napkin 1, and is not limited to a mode parallel to the vertical direction X. That is, the compressed groove 30 may be curved or meandering.

In addition, a dimension along the lateral direction Y between the lateral end portion 21d of the intermediate core portion 21 and the compressed groove 30 is defined as a first width D11, and the dimension in the lateral direction Y between the compressed groove 30 and the central external force buffer 23 is defined as The dimension along the length is defined as a second width D12. At this time, the second width D12 is configured to be larger than the first width D11.
The first width D11 is the maximum dimension along the horizontal direction Y from the lateral end 21d of the intermediate core portion 21 to the outer edge of the compression groove 30 in the horizontal direction Y, and the second width D12 is It is the maximum dimension along the lateral direction Y from the lateral inner edge to the outer edge of the central external force buffer 23.

  The compressed groove 30 divides the intermediate core portion 21 into a peripheral area 21 e outside the compressed groove 30 in the lateral direction Y and a central area 21 c between the compressed grooves 30. That is, in the above configuration, the central external force buffer 23 is formed at the center of the central area 21c, and the second external force corresponding to the half width of the central area 21c is smaller than the first width D11 which is the width of the peripheral area 21e. The width D12 is larger.

Since the compressed groove 30 is a region in which the absorbent core 16 is compacted, the compressed groove 30 has higher rigidity than the surrounding peripheral region 21e and the central region 21c, and is a region that is difficult to deform.
Thereby, when an external force in the direction of compressing the napkin 1 is applied from the lateral direction Y, the outer peripheral region 21e of the compression groove 30 is compressed and deformed by receiving the external force. Since the first width D11 is configured to be smaller than the second width D12, the influence of the external force can be concentrated on the peripheral region 21e, and the entire napkin 1 can be suppressed from being compressed and deformed.
On the other hand, when the intermediate core portion 21 receives an external force from the lateral direction Y, the compression groove 30 suppresses the propagation of the compression deformation to the central region 21c, and the compression groove 30 acts as a starting point of the elastic deformation. In other words, the compression grooves E forming a pair approach each other in the lateral direction Y by receiving an external force, and the central region 21c therebetween is bent and deformed so as to rise in the skin direction Z1 around the central external force buffer 23.
By sufficiently securing the second width D12, that is, the distance between the compressed grooves 30, a region that is elastically deformed by receiving an external force can be sufficiently secured, and it is possible to promote deformation to a gentle convex shape.
As described above, the external force is absorbed and reduced by the compressed groove 30, and the action of the central external force buffer 23 is promoted, so that a deformation to a preferable shape when the external force is applied is promoted.

The compressed groove 30 is not limited to the configuration example shown in FIG. For example, the compressed groove 30 may be formed not only in the intermediate core portion 21 but also in the front core portion 20 and the rear core portion 22. In this case, the pair of compressed grooves 30 on the left and right may be connected at the front and rear ends, so that the annular compressed groove 30 may be configured as a whole.
Further, a plurality of pairs of the compressed grooves 30 may be formed. Furthermore, each compressed groove 30 may be divided in the vertical direction X and formed discontinuously.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

  In the above embodiment, the example of the sanitary napkin is shown as the absorbent article, but the absorbent article is not limited to this. The absorbent article of the present invention may be, for example, a urine absorbing pad, a vaginal sheet, a disposable diaper, or the like.

1. Napkin (absorbent article)
DESCRIPTION OF SYMBOLS 11 ... Absorber 12 ... Top sheet 13 ... Back sheet 15 ... Adhesive part 16 ... Absorbent core 20 ... Front core part 21 ... Intermediate core part 22 ... Back core part 23 ... Central external force buffer part

Claims (6)

A topsheet arranged on the skin side of the wearer, a backsheet arranged on the non-skin side, and an absorbent body having an absorbent core and arranged between the topsheet and the backsheet, An absorbent article having a vertical direction corresponding to the front-rear direction of the wearer and a horizontal direction orthogonal to the vertical direction,
The absorbent core comprises:
A front core portion and a rear core portion located at both ends in the longitudinal direction,
An intermediate core portion located between the front core portion and the rear core portion, and narrower than the front core portion and the rear core portion. Part does not have a region protruding toward the skin side, which is thicker than the surrounding region,
An absorbent article having at least a central external force buffer formed in the lateral center of the intermediate core and extending in the longitudinal direction. The central external force buffer,
The absorbent article according to claim 1, wherein the absorbent article is located at the central portion in the lateral direction of the absorbent core and extends in the longitudinal direction from the front core portion to the rear core portion. The central external force buffer,
The absorbent article according to claim 2, wherein the front core portion and the rear core portion are formed wider than the intermediate core portion. The absorbent core comprises:
4. The apparatus according to claim 1, further comprising a side external force buffer formed on both sides in the lateral direction of the central external force buffer, extending in the vertical direction and promoting standing in a non-skin direction. 5. The absorbent article according to the above. The absorbent core comprises:
5. A side external force buffer that is formed on both sides in the lateral direction of the central external force buffer and that extends in the lateral direction and promotes standing in a non-skin direction. 5. The absorbent article according to the above. The absorbent article,
The absorber is configured to be compressed in the thickness direction together with the topsheet, and further includes a pair of compressed grooves extending in the longitudinal direction in the intermediate core portion,
A dimension along the lateral direction between the lateral end portion and the compressed groove of the intermediate core portion is a first width, and a dimension along the lateral direction between the compressed groove and the central external force buffer is defined as a first width. The said 2nd width is larger than the said 1st width, when is set as a 2nd width. The absorbent article as described in any one of Claims 1 thru | or 5.

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