JP3244393U - absorbent articles - Google Patents

Abstract

An object of the present invention is to provide an absorbent article that can maintain a high fit with a wearer. An absorbent body 11 of an absorbent article includes an absorbent core 16 and a core wrap sheet 17 that covers the absorbent core. The absorbent body further includes a high basis weight area 18 located on the lateral center side of the excretion part facing area, a low basis weight area 19 located on the lateral outside of the high basis weight area, and a lateral side of the low basis weight area. It has an ultra-low basis weight region 20 located on the outside in the direction. The ultra-low basis weight region includes a core wrap joint 21 in which the front and back regions of the core wrap sheet are joined in the thickness direction and extends in the longitudinal direction, and a core wrap joint 21 that is located laterally outside of the core wrap joint, and the front and back regions are joined at a seam. and a loop portion 22 that is connected to the other end. [Selection diagram] Figure 6

Description

The present invention relates to absorbent articles such as sanitary napkins.

Absorbent articles such as sanitary napkins typically have a width greater than the wearer's crotch width. For this reason, external forces are likely to be applied to the absorbent article when worn from the left and right outer sides toward the center. When such an external force is applied, the absorbent body undergoes deformation that reduces its fit with the wearer's excretory area, making it more likely to cause fluid leakage. For example, Patent Document 1 describes an absorbent article having a narrow intermediate core portion in the longitudinal middle portion of the absorbent core from the viewpoint of suppressing undesirable deformation of the absorbent core.

Japanese Patent Application Publication No. 2019-103709

Furthermore, there is a desire for an absorbent article that can maintain a high fit with the wearer even when external force is continuously applied to the absorber due to the wearer's movements or the like.

An object of the present invention is to provide an absorbent article that can maintain a high fit with the wearer.

An absorbent article according to one embodiment of the present invention includes a main body having a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, The absorbent article has a corresponding longitudinal direction, a lateral direction perpendicular to the longitudinal direction, and a thickness direction perpendicular to the longitudinal direction and the lateral direction.
The absorber is
an absorbent core;
A core wrap sheet that covers the absorbent core and includes a surface region disposed on the top sheet side of the absorbent core and a back region disposed on the back sheet side of the absorbent core. .
The main body is divided into a front region, an excretion part facing region, and a rear region along the longitudinal direction.
The absorber further includes:
a high basis weight region located on the lateral center side of the excretion part facing region;
a low basis weight region located laterally outside of the high basis weight region and having a lower basis weight than the high basis weight region;
an ultra-low basis weight region located laterally outside the low basis weight region and having a lower basis weight than the low basis weight region.
The ultra-low basis weight region is
a core wrap joint where the front surface region and the back surface region are joined in the thickness direction and extend in the longitudinal direction;
a loop portion located on the laterally outer side of the core wrap joint portion, and in which the front surface region and the back surface region are seamlessly connected.

According to the absorbent article of the present invention, it is possible to maintain a high fit with the wearer.

1 is a perspective view showing an absorbent article according to an embodiment of the present invention. It is a top view which shows the aspect which stretched the said absorbent article on the XY plane and looked at it from the topsheet side. 3 is a cross-sectional view showing the absorbent article, and is a cross-sectional view taken along line III-III in FIG. 2. FIG. It is a top view which shows the aspect which stretched the said absorbent article on the XY plane and looked at it from the back sheet side. It is a top view which shows the absorber of the said absorbent article. FIG. 6 is a cross-sectional view schematically showing the absorber, and is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a cross-sectional view schematically showing an absorber according to another configuration example of the above embodiment, and is a view showing a cross section at the same position as FIG. 6 . 4 is a plan view showing an absorbent core of the absorbent body shown in FIG. 3. FIG. FIG. 7 is a cross-sectional view schematically showing an absorber according to another configuration example of the above embodiment, and is a view showing a cross section at the same position as FIG. 6 . It is a top view which shows the absorber based on the other structural example of the said embodiment. It is a top view which shows the absorber based on the other structural example of the said embodiment. 12 is a plan view showing an absorbent core of the absorbent body shown in FIG. 11. FIG. FIG. 3 is a plan view showing the positional relationship between the wing part and the absorbent core of the absorbent article shown in FIG. 2. FIG. FIG. 3 is a plan view showing the positional relationship between the three-dimensional gathers and the absorbent core of the absorbent article shown in FIG. 2. FIG.

Embodiments of the present invention will be described below with reference to the drawings.

[Overall composition of napkin]
As shown in FIGS. 1 and 2, the absorbent article 1 of the present embodiment includes a main body M, a pair of wing parts W, a pair of three-dimensional gathers G, a compression groove part E, and a pair of rear flap parts F. , is provided. The absorbent article 1 is configured as a sanitary napkin, and is hereinafter referred to as the napkin 1.
The napkin 1 has three dimensions: a vertical direction It has Z. In this specification, with respect to the thickness direction Z, the side closer to the wearer's skin when worn is sometimes referred to as the upper or skin side, and the side closer to clothing is sometimes referred to as the lower or non-skin side.
The napkin 1 may be used while sleeping, and may have a length of 30 cm or more in the longitudinal direction X, for example.
Moreover, in this specification, "planar view" means a planar view seen from the thickness direction Z.

The main body M has an absorbent body 11, which will be described later, and has a function of absorbing liquid substances (hereinafter also referred to as "liquid") such as the wearer's menstrual blood.
The main body M is divided along the longitudinal direction X into a front region M1, an excretion part facing region M2, and a rear region M3.
The excretory part facing area M2 is an area that faces the wearer's excretory part when worn. In the example shown in FIG. 2, the excretion part facing area M2 coincides with the formation area of the wing part W in the longitudinal direction X. In addition, when the napkin 1 does not have the wing part W, the central region obtained by dividing the main body M into three equal parts along the longitudinal direction X is defined as the excretory part facing region M2.
The front region M1 is a region arranged in front of the excretory part facing region M2 (on the ventral side of the wearer), and is arranged so as to face the front of the wearer's excretory part when worn.
The rear region M3 is a region located behind the excretory part facing region M2 (on the back side of the wearer), and is arranged so as to face the rear of the wearer's excretory part when worn.
When worn here, it means a state in which the normal proper wearing position (the expected wearing position of the napkin 1) is maintained, and does not include the case where the napkin 1 is deviated from the wearing position.

The wing portion W is configured to protrude outward in the lateral direction Y from the excretion portion facing region M2 of the main body M.
The three-dimensional gathers G are provided on the side portions of the main body M in the horizontal direction Y, and are arranged so as to extend in the vertical direction X. The three-dimensional gathers G stand up on the skin side in the thickness direction Z when worn, and have the function of preventing liquid leakage in the lateral direction Y.
The compressed groove portion E is formed by being compressed downward in the thickness direction Z from the top sheet 12, which will be described later, and is formed around the central portion of the main body M.
The rear flap portion F is configured to bulge outward in the lateral direction Y from the rear region M3 of the main body M.
In addition, the napkin 1 does not need to have at least one of the wing part W, the three-dimensional gathers G, the compression groove part E, and the rear flap part F.

As shown in FIG. 3, the napkin 1 includes an absorbent core 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 structure in which a back sheet 13, an absorbent core 11, and a top sheet 12 are laminated in the thickness direction Z. Each structure of the napkin 1 is suitably joined and integrated, for example, by joining with an adhesive, heat sealing, etc., and by embossing with the compressed grooves E, etc.

The absorbent body 11 extends along the longitudinal direction X and is disposed between the top sheet 12 and the back sheet 13. The absorber 11 absorbs liquid from the top sheet 12 side, diffuses it inside, and retains the liquid. The detailed structure of the absorber 11 will be described later.

The top sheet 12 is arranged above the absorber 11 in the thickness direction Z. The sheet material forming the topsheet 12 is not particularly limited as long as it has liquid permeability and can be applied as a topsheet of an absorbent article. In addition, between the top sheet 12 and the absorbent body 11, there is a material that improves the permeability of liquid from the top sheet 12 to the absorbent body 11, prevents liquid absorbed by the absorbent body 11 from returning to the top sheet 12, etc. From this point of view, a second sheet (sublayer sheet) may be arranged.

The back sheet 13 is arranged below the absorber 11 in the thickness direction Z. The back sheet 13 is formed of, for example, a sheet material having functions such as low liquid permeability, water vapor permeability, and water repellency. As the sheet material, for example, a thermoplastic resin film, a laminate of the film and a nonwoven fabric, or the like can be used without particular limitation. The back sheet 13 is joined to the top sheet 12 and the side sheets 14, for example, at the periphery using an adhesive, heat sealing, or the like. The back sheet 13 may be bonded to the absorbent body 11 with an adhesive or the like.

The pair of side sheets 14 face each other in the lateral direction Y with the top sheet 12 in between, and are arranged at the periphery of the napkin 1 in the lateral direction Y. The sheet material constituting the side sheet 14 is preferably a sheet material with lower hydrophilicity than the top sheet 12, and specifically, a nonwoven fabric, a film material, or a combination of a nonwoven fabric and a film material, which has a lower hydrophilicity than the top sheet 12. Examples include sheets with a laminate structure.
In the present embodiment, the side sheet 14 forms a three-dimensional gather G by folding back the center side in the lateral direction Y to the outside. The detailed configuration of the three-dimensional gathers G will be described later.

As shown in FIGS. 3 and 4, the main body M may further include a main body adhesive portion (adhesive portion) 15 disposed on the outer surface of the back sheet 13. The main body adhesive part 15 has a function of fixing the main body M to the inner surface of the underwear. The main body adhesive part 15 extends in the longitudinal direction X over, for example, the front region M1, the excretion part facing region M2, and the rear region M3. The main body adhesive portion 15 is formed, for example, by coating the back sheet 13 with an adhesive such as a hot melt adhesive. The main body adhesive part 15 may be provided divided into a plurality of parts, for example, divided into two parts sandwiching the center of the main body M in the lateral direction Y.

As shown in FIGS. 3 and 4, the wing portion W may have a wing adhesive portion 29 disposed on the outer surface of the back sheet 13. The wing adhesive portion 29 has a function of fixing the wing portion W folded back toward the non-skin side to the outer surface of the underwear. The wing adhesive portion 29 may be provided divided into a plurality of parts, or may be provided integrally.
As shown in FIG. 4, the rear flap part F may have a flap adhesive part 34 arranged on the outer surface of the back sheet 13. The flap adhesive part 34 has a function of fixing the rear flap part F to the inner surface of the underwear. The wing adhesive portion 29 may be provided divided into a plurality of parts, or may be provided integrally.
The wing adhesive portion 29 and the flap adhesive portion 34 are also formed, for example, by coating the back sheet 13 with an adhesive such as a hot melt adhesive.

[Configuration of absorber]
As shown in FIG. 3, the absorbent core 11 includes an absorbent core 16 and a core wrap sheet 17.
The absorbent core 16 has the function of diffusing and retaining liquid. The absorbent core 16 is, for example, mainly composed of a fiber aggregate composed of hydrophilic fibers such as pulp fibers, and from the viewpoint of increasing absorbency, is preferably formed of a fiber aggregate containing a water-absorbing polymer.

The core wrap sheet 17 has a function of covering the absorbent core 16 and, for example, maintaining the shape of the absorbent core 16. The core wrap sheet 17 is made of a liquid-permeable thin sheet material. The core wrap sheet 17 includes a front surface region 17 a disposed on the top sheet 12 side of the absorbent core 16 and a back surface region 17 b disposed on the back sheet 13 side of the absorbent core 16 . Cover the top and bottom surfaces. The front surface region 17a forms the upper surface of the absorbent body 11, and the back surface region 17b forms the lower surface of the absorbent body 11.
The core wrap sheet 17 is wound around the absorbent core 16 in the horizontal direction Y, and covers the upper and lower surfaces of the absorbent core 16. The core wrap sheet 17 includes an overlapping portion 17c in which the left and right ends of the sheet material constituting the core wrap sheet 17 in the lateral direction Y overlap. The overlapping portion 17c is preferably arranged in the back region 17b or the front region 17a, and in the example shown in FIG. 3, it is arranged in the back region 17b. Thereby, the seam of the core wrap sheet 17 can be placed in the back area 17b or the front area 17a.
The width of the core wrap sheet 17 in the lateral direction Y is preferably configured to be substantially constant along the longitudinal direction It's okay.

The absorbent body 11 generally has a width wider than the wearer's crotch width from the viewpoint of ensuring absorbency. Therefore, in particular, external force directed from the outside in the lateral direction toward the inside is easily applied to the absorbent body 11 in the excretion part facing region M2 by both legs of the wearer. From the viewpoint of alleviating the influence of such external forces, the absorbent body 11 of the present embodiment has a characteristic feature in which the basis weight gradually decreases from the center side toward the outside in the lateral direction Y in the excretion part facing region M2. It has a basis weight distribution.
The details of the basis weight distribution of the absorbent body 11 will be described below.

As shown in FIGS. 5 and 6, the absorbent body 11 has a high basis weight region 18, a low basis weight region 19 disposed on both left and right sides of the high basis weight region 18, and a low basis weight region 19 in the excretion part facing region M2. ultra-low basis weight regions 20 disposed on both left and right sides of the weight region 19. The low basis weight region 19 has a lower basis weight than the high basis weight region 18. The ultra-low basis weight region 20 has a lower basis weight than the low basis weight region 19. In other words, the absorbent body 11 has at least three levels of basis weight distribution. The high basis weight region 18, the low basis weight region 19, and the very low basis weight region 20 are defined by the basis weight of the constituent material of the absorbent core 16 in the absorbent body 11.
Note that the absorber 11 typically has a bilaterally symmetrical shape when viewed from above.

As shown in FIG. 5, the high basis weight region 18 is located at least on the center side in the lateral direction Y of the excretion part facing region M2. "The high basis weight area 18 is located on the center side of the excretion part facing area M2 in the lateral direction Y" means that the high basis weight area 18 is located at least on the center line dividing the excretion part facing area M2 into two equal parts in the lateral direction Y. This means that it is located relatively closer to the center in the lateral direction Y than the low basis weight region 19, which will be described later. The length of the high basis weight region 18 in the vertical direction X is preferably 70% or more, and more preferably 100% or more, of the total length of the excretion part facing region M2 in the vertical direction X.

As shown in FIG. 6, the high basis weight region 18 includes, for example, a high basis weight portion 26 of the absorbent core 16, which will be described later, and a portion of the front surface region 17a and back surface region 17b of the core wrap sheet 17. The high basis weight portion 26 may be a thick portion in the thickness direction Z as shown in FIG. 6, or may be a high density portion in which the constituent material of the absorbent core 16 is compressed in the thickness direction Z.
By providing the high basis weight region 18 facing the wearer's excretory area, the high basis weight area 18 can easily fit into the excretory area, and sufficient liquid absorbency can be ensured.
In addition, even if a part of the high basis weight part 26 and the overlapping part 17c of the core wrap sheet 17 overlap in plan view, the area including the high basis weight part 26 and the overlapping part 17c and the high basis weight part 26 The high basis weight region 18 includes both the region including the overlapping portion 17c and the region not including the overlapping portion 17c. By defining in this way, even if there is a region with a high basis weight due to the core wrap sheet 17 in the high basis weight region 18, the high basis weight region 18 can be defined based on the basis weight of the absorbent core 16. I can do it.

As shown in FIG. 5, the low basis weight region 19 is located outside the high basis weight region 18 in the lateral direction Y. The low basis weight region 19 may be longer or shorter than the high basis weight region 18 in the longitudinal direction X. It is preferable that the low basis weight region 19 has a length equal to or longer than the entire length in the vertical direction X of the high basis weight region 18 from the viewpoint of effectively obtaining the deformation suppressing effect of the high basis weight region 18 described later. In the example shown in FIG. 5, a pair of low basis weight regions 19 extend over the entire length of the high basis weight region 18 in the vertical direction X, and are arranged on the left and right sides of the high basis weight region 18.

As shown in FIG. 6, the low basis weight region 19 includes, for example, a low basis weight portion 27 of the absorbent core 16, which will be described later, and a portion of the front surface region 17a and back surface region 17b of the core wrap sheet 17. The low basis weight portion 27 may be a portion thinner in the thickness direction Z than the high basis weight portion 26 as shown in FIG. 6, or may be a low density portion having a lower density than the high basis weight portion 26. .

As shown in FIG. 5, the ultra-low basis weight region 20 is located outside the low basis weight region 19 in the lateral direction Y. The ultra-low basis weight region 20 may be longer or shorter than the low basis weight region 19 in the longitudinal direction X. As shown in FIG. 5, the ultra-low basis weight region 20 has a length equal to or longer than the entire length in the longitudinal direction of the low basis weight region 19, from the viewpoint of effectively obtaining the deformation suppressing effect of the high basis weight region 18, which will be described later. It is preferable. In the example shown in FIG. 5 , a pair of very low basis weight regions 20 extend forward and backward in the vertical direction X from the low basis weight region 19 and are arranged on the left and right sides of the low basis weight region 19 .

As shown in FIGS. 5 and 6, the ultra-low basis weight region 20 includes a core wrap joint 21 in which the front surface region 17a and the back surface region 17b of the core wrap sheet 17 are joined in the thickness direction Z, and The core wrap sheet 17 has a loop portion 22 formed in a loop shape at the side edge portion 11s in Y.
In FIG. 5, in order to clarify the arrangement of the core wrap joint 21, the core wrap joint 21 is shown with diagonal hatching.

As shown in FIG. 5, the core wrap joint 21 extends in the longitudinal direction X. As shown in FIG. "The core wrap joint 21 extends in the vertical direction X" only needs to extend in the vertical direction X as a whole, and includes a mode in which at least a portion thereof is curved or meandering. Further, the shape of the core wrap joint portion 21 in plan view is preferably linear as shown in FIG. 5, but may be a spiral coating pattern. The width of the core wrap joint 21 in the lateral direction Y is preferably 5 mm or less, more preferably 3 mm or less, from the viewpoint of ensuring a sufficient width of the loop portion 22 in the lateral direction Y. It is preferable that the core wrap joint 21 extends over 30% or more of the entire length in the longitudinal direction X of the side edge 19s in the lateral direction Y of the low basis weight region 19, and extends over 30% or more of the entire length in the longitudinal direction X of the side edge 19s. It is more preferable to be present.

As shown in FIG. 6, in the core wrap joint 21 of the absorbent body 11, the front surface region 17a and the back surface region 17b are directly joined without using the absorbent core 16. However, the core wrap joint portion 21 may include the constituent material 16m of the absorbent core 16 with a basis weight smaller than that of the low basis weight region 19, similarly to the loop portion 22 described later.
The joining method of the core wrap joint portion 21 is appropriately selected in consideration of the material of the core wrap sheet 17, adhesiveness upon contact with liquid, and the like. For example, in the core wrap joint 21, the front surface region 17a and the back surface region 17b are joined by hot melt adhesive, heat sealing, ultrasonic sealing, etc. in order to prevent a decrease in bonding strength due to contact with liquid. is preferred.

As shown in FIG. 5, the loop portion 22 is located on the outer side of the core wrap joint portion 21 in the lateral direction Y, and includes the side edge portion 11s of the absorbent body 11. In the example shown in FIG. 5, the end portion of the loop portion 22 in the vertical direction X has a shape in which the width in the horizontal direction Y gradually decreases toward the front or rear in the vertical direction X. Alternatively, the loop portion 22 may have a rectangular shape with substantially the same width as a whole. The end of the loop portion 22 in the longitudinal direction X may not be closed by the core wrap joint 21 as shown in FIG. 5, or may be closed by the core wrap joint 21.

As shown in FIG. 6, in the loop portion 22, the front surface area 17a and the back surface area 17b are seamlessly connected. Thereby, the core wrap sheet 17 is formed into a loop shape at the side edge 11s of the absorbent body 11. "The front surface region 17a and the back surface region 17b are seamlessly connected" means that the front surface region 17a and the back surface region 17b are connected to the side without overlapping the ends of the sheet material of the core wrap sheet 17 in the loop portion 22. This means that it is formed of a common sheet material folded back at the edge 11s.

The constituent material of the absorbent core 16 may or may not be arranged inside the loop portion 22 .
FIG. 6 shows an example in which the constituent material of the absorbent core 16 is not placed inside the loop portion 22. In this case, the inside of the loop portion 22 becomes a space, which may become a core-free portion 24s, which will be described later.
On the other hand, FIG. 7 shows an example in which the constituent material 16m (for example, fibers) of the absorbent core 16 is arranged inside the loop portion 22. In this case, the basis weight of the loop portion 22 is configured to be lower than the low basis weight region 19. Such a configuration can be realized by making the thickness of the loop portion 22 thinner than the low basis weight region 19, or by making the density of the constituent material 16m lower than the density of the main body of the absorbent core 16, etc. . Specifically, the basis weight of the constituent material 16m of the absorbent core 16 is preferably 50% or less, and preferably 20% or less, of the low basis weight region 19 inside the loop portion 22.
With such a configuration, the basis weight of the loop portion 22 can be suppressed to be lower than the low basis weight region 19, and the flexibility of the loop portion 22 can be ensured.

In the above configuration, the absorbent body 11 includes a high basis weight area 18, a low basis weight area 19, and a very low basis weight area arranged in order from the center side in the lateral direction toward the outside in the lateral direction Y in the excretion part facing area M2. It has 20. Thereby, the basis weight in the excretion part facing region M2 of the absorbent body 11 decreases stepwise from the center side in the lateral direction Y toward the outer side in the lateral direction Y. The basis weight of the absorbent core 11 usually has a positive correlation with the rigidity, except for high-density areas such as the compressed grooves E. That is, the rigidity in the excretion part facing region M2 of the absorbent body 11 gradually decreases from the center side in the lateral direction Y toward the outer side in the lateral direction Y. Therefore, when an external force is applied to the absorber 11 from the outside in the lateral direction Y, the ultra-low basis weight region 20 is most likely to deform, followed by the low basis weight region 19. The deformation of the ultra-low basis weight region 20 and the low basis weight region 19 relieves the external force, and suppresses undesirable deformation such as compressive deformation of the high basis weight region 18. Therefore, the fit of the high basis weight region 18 to the wearer's excretory area is maintained.
Furthermore, in the above configuration, the core wrap joint 21 restricts movement of the constituent material of the absorbent core 16 outward in the lateral direction Y, making it easier to maintain the shape of the absorbent core 16. Thereby, even when external force is applied, the structure of the absorbent core 16 does not break, and the deformation suppressing effect of the high basis weight region 18 is continuously exerted. In addition, diffusion of liquid to the outside of the absorbent core 11 in the lateral direction Y and local deformation near the side edge 11s of the absorbent core 11 due to breakage of the absorbent core 16 are suppressed, resulting in continued discomfort when worn. is suppressed.
In addition, since the loop portion 22 has a configuration in which the sheet-like core wrap sheet 17 is configured in a loop shape, the loop portion 22 is easily deformed flexibly so as to be recessed inward in the lateral direction Y due to an external force on the outside in the lateral direction Y. When the addition of is removed, it is easy to return to the original shape. This allows the loop portion 22 to more effectively buffer external forces. In addition, the presence of the core wrap joint 21 makes it difficult for the influence of elastic deformation of the loop portion 22 to be propagated to the low basis weight region 19 side. Therefore, even if the loop portion 22 is significantly deformed, large deformation of the low basis weight region 19 that would affect the high basis weight region 18 is suppressed. As a result, undesirable deformation such as compressive deformation of the high basis weight region 18 is more reliably suppressed.
As described above, with the above structure, even in a situation where an external force is applied from the wearer, undesirable deformation of the absorber 11 is continuously suppressed, and a high fit to the wearer's excretory area is maintained. Therefore, liquid leakage due to deformation of the absorber 11 is effectively and continuously suppressed.

[Detailed configuration of ultra-low basis weight area]
From the viewpoint of forming the loop part 22 more flexibly and increasing the buffering effect against external forces, it is more preferable that the ultra-low basis weight region 20 does not substantially contain the absorbent core 16, as shown in FIG. That is, it is preferable that the ultra-low basis weight region 20 is constituted by the core wrap sheet 17.
“The ultra-low basis weight region 20 is constituted by the core wrap sheet 17” means that the ultra-low basis weight region 20 does not substantially contain the constituent material of the absorbent core 16. "Substantially does not contain the constituent material of the absorbent core 16" means that there is no constituent material of the absorbent core 16, except for fiber pieces of the absorbent core 16 that are accidentally mixed in. However, specifically, this means that the basis weight of the absorbent core 16 in the ultra-low basis weight region 20 is 10% or less of the basis weight of the low basis weight portion 27, preferably 3% or less.

With the above configuration, the rigidity of the loop portion 22 is extremely low, and the loop portion 22 can be more flexibly deformed against external force from the wearer. Thereby, the external force buffering effect of the ultra-low basis weight region 20 is more effectively exerted, and undesirable deformation of the high basis weight region 18 is more reliably suppressed. Therefore, high fit to the wearer's excretory area is more reliably maintained.

In order for the ultra-low basis weight region 20 to be constituted by the core wrap sheet 17, it is necessary to provide a region outside the low basis weight region 19 in the lateral direction Y in which the absorbent core 16 is not arranged. Since the width of the core wrap sheet 17 in the lateral direction Y is typically configured to be approximately constant, the absorbent core 16 is configured such that the width in the lateral direction Y becomes narrower in the excretion part facing region M2. It is preferable.
Hereinafter, a preferred configuration example of the absorbent core 16 will be described with reference to FIG. 8.

[Example of composition of absorbent core]
As shown in FIG. 8, the absorbent core 16 includes a front core section 23, an intermediate core section 24, and a rear core section 25. The front core part 23, the intermediate core part 24, and the rear core part 25 are lined up along the longitudinal direction X. That is, the front core part 23 and the rear core part 25 are located on both end sides in the longitudinal direction X, and the intermediate core part 24 is located between the front core part 23 and the rear core part 25. The intermediate core portion 24 is located in the excretion portion facing region M2. The length of the intermediate core portion 24 in the vertical direction X is preferably 70% or more, and more preferably 100% or more, of the total length of the excretion part facing region M2 in the vertical direction X.

The intermediate core portion 24 shown in FIG. 8 has a width D2 narrower than the width D1 of the front core portion 23 and the width D3 of the rear core portion 25. That is, the absorbent core 16 shown in FIG. 8 has a planar shape that is narrowed in the lateral direction Y at the intermediate core portion 24.
The width D2 of the intermediate core portion 24 is the minimum width in the lateral direction Y. The width D1 of the front core portion 23 and the width D3 of the rear core portion 25 are the maximum widths in the lateral direction Y.

The width D1 of the front core part 23 and the width D3 of the rear core part 25 may be the same or different, and in the example shown in FIG. 8, they have substantially the same dimensions.
In the example shown in FIG. 8, the width D2 of the intermediate core portion 24 is formed constant along the longitudinal direction X. In the example shown in FIG. Further, the front core portion 23 and the rear core portion 25 include a region having a constant width along the longitudinal direction X.
In this specification, "the width is constant" in a certain region means that the width variation within each region is within 20% when the minimum width of the region in the horizontal direction Y is 100%. Say something. The variation is preferably 15% or less, more preferably 10% or less.
The lengths of the front core part 23 and the rear core part 25 in the longitudinal direction X may be the same or different, for example, the rear core part 25 is configured to be longer.

The boundary portion between the front core portion 23 and the intermediate core portion 24, which have different widths, is configured such that the width gradually increases toward the front in the longitudinal direction X, for example. That is, the front core section 23 includes a front tapered section 23t that is formed adjacent to the intermediate core section 24 and whose width gradually increases toward the front in the longitudinal direction X.
Similarly, the boundary portion between the rear core portion 25 and the intermediate core portion 24, which have different widths, is configured such that the width gradually increases toward the rear in the longitudinal direction X, for example. That is, the rear core portion 25 includes a rear tapered portion 25t that is formed adjacent to the intermediate core portion 24 and whose width gradually increases toward the rear in the longitudinal direction X.
The outer edges of the front tapered portion 23t and the rear tapered portion 25t are not limited to a straight line, but may be curved. The shapes of the rear tapered portion 25t and the front tapered portion 23t may be symmetrical or asymmetrical.

The intermediate core portion 24 includes a high basis weight portion 26 and a low basis weight portion 27 having a lower basis weight than the high basis weight portion 26. In FIG. 8, the high basis weight portion 26 is shown with a high-density dot pattern, and the low basis weight portion 27 is shown with a low-density dot pattern.
The high basis weight portion 26 is located on the center side in the lateral direction Y, and protrudes in the thickness direction Z, for example. In the example shown in FIGS. 3 and 6, the high basis weight portion 26 protrudes toward the skin side in the thickness direction Z.
The low basis weight portion 27 is formed on the side portion of the high basis weight portion 26 in the lateral direction Y. In the example shown in FIG. 8, the low basis weight section 27 is divided into left and right parts with the high basis weight section 26 in between.

As shown in FIG. 6 , the high basis weight portion 26 is included in the high basis weight region 18 of the absorbent core 11 . The low basis weight portion 27 is included in the low basis weight region 19 of the absorbent body 11. Thereby, the low basis weight region 19 can be configured with a lower basis weight than the high basis weight region 18. Further, a region (referred to as a core-free region 24s) in which the constituent material of the absorbent core 16 is substantially absent outside the low basis weight portion 27 in the lateral direction Y is located in the ultra-low basis weight region 20 of the absorbent body 11. included.

With such an absorbent core 16, it is possible to form a basis weight distribution in the absorbent body 11 such that the basis weight decreases stepwise from the center side in the lateral direction Y of the excretory portion facing region M2 toward the outside. Furthermore, by configuring the intermediate core portion 24 to be narrow, a core-free portion 24s is provided outside the low basis weight portion 27 in the lateral direction Y, and the ultra-low basis weight region 20 is configured only by the core wrap sheet 17. be able to. Therefore, the rigidity of the loop portion 22 is reliably lowered compared to the low basis weight region 19, and the external force buffering effect by the ultra-low basis weight region 20 is more reliably exerted.

In addition, by using the absorbent core 16 as shown in FIG. 8, the loop portion 22 is configured to extend from the front core portion 23 to the rear core portion 25 through the core-free portion 24s. Thereby, the loop part 22 is maintained in a state where a constant tension is applied in the longitudinal direction X. Therefore, when the loop portion 22 receives an external force from the outside in the lateral direction Y, it generates a tensile force in the vertical direction X, which acts as a resistance to the external force (compression deformation resistance in the lateral direction Y). As a result, the buffering effect against external forces is enhanced in the loop portion 22, and deformation of the low basis weight region 19 is further suppressed. Therefore, undesirable deformation such as compressive deformation of the high basis weight region 18 is more reliably suppressed.

[Example of arrangement of core wrap joint]
From the viewpoint of more reliably obtaining the shape retention of the absorbent core 16 by the core wrap joint 21, as shown in FIGS. 5 and 6, the core wrap joint 21 is adjacent to the side edge 19s of the low basis weight region 19. It is preferable that it extends. "The core wrap joint 21 extends adjacent to the side edge 19s" means that at least a portion of the core wrap joint 21 extends in the vertical direction X while adjoining the side edge 19s in the horizontal direction Y.
In this configuration, the core wrap joint 21 divides the low basis weight region 19 and the very low basis weight region 20, and the movement of the constituent material of the absorbent core 16 from the low basis weight region 19 to the very low basis weight region 20 is prevented. More definitely restricted. Thereby, the shape of the absorbent core 16 is maintained more reliably when worn. Therefore, the ultra-low basis weight region 20 can maintain lower rigidity than the low basis weight region 19, and the buffering effect of the external force by the ultra-low basis weight region 20 can be maintained more reliably. In addition, discomfort caused by the breakage of the absorbent core 16 and deterioration in fit are more reliably suppressed.

Note that the arrangement of the core wrap joint portion 21 is not limited to the above. For example, as shown in FIG. 9, the core wrap joint 21 may be spaced apart from the side edge 19s of the low basis weight region 19 in the lateral direction Y. In this case, the ultra-low basis weight region 20 further includes an intervening region 28 interposed between the side edge 19s and the core wrap joint 21. The intervening region 28 is a region having a lower basis weight than the low basis weight region 19, and in the example shown in FIG. 9, it is a region that does not substantially contain the constituent material of the absorbent core 16. Even with such a configuration, the movement of the constituent material of the absorbent core 16 is restricted by the core wrap joint 21, so that the external force buffering effect of the ultra-low basis weight region 20 is maintained.

[Example of configuration of core wrap joint in plan view]
Further, from the viewpoint of more reliably obtaining the shape retention of the absorbent core 16 by the core wrap joint 21, the core wrap joint 21 is configured in a linear shape that extends continuously in the longitudinal direction X, as shown in FIG. It is preferable. "The core wrap joint 21 extends continuously in the longitudinal direction X" means that the core wrap joint 21 extends continuously from the front end to the rear end in the longitudinal direction X without interruption.
In this configuration, the core wrap joint portion 21 more reliably suppresses movement of the constituent material of the absorbent core 16 to the loop portion 22 . Thereby, the shape of the absorbent core 16 is more reliably maintained even when worn, where various external forces may be applied. Therefore, the ultra-low basis weight region 20 can maintain lower rigidity than the low basis weight region 19, and the buffering effect of the external force by the ultra-low basis weight region 20 can be maintained more reliably.

Note that the configuration of the core wrap joint portion 21 in plan view is not limited to the above. For example, as shown in FIG. 10, the core wrap joint 21 may include a plurality of joint regions 21a spaced apart in the longitudinal direction X. The length in the longitudinal direction X of the discontinuous portion between each joining region 21a is preferably 3 mm or less from the viewpoint of suppressing movement of the constituent material of the absorbent core 16 from the discontinuous portion.

[Example of configuration of side edge of low basis weight region and core wrap joint]
As shown in FIG. 5, the side edges 19s of the low basis weight region 19 in the horizontal direction Y may be formed in a straight line along the vertical direction X. In this case, at least a portion of the core wrap joint 21 may extend linearly along the linear side edge 19s. Note that the core wrap joint portion 21 is not limited to the example shown in FIG. 5, and may extend so as to reach the side edge portion 11s of the absorbent core 11 along the front tapered portion 23t and/or the rear tapered portion 25t.

Alternatively, from the viewpoint of more effectively buffering the external force applied to the low basis weight region 19, as shown in FIG. It may be in the form of In this case, the core wrap joint 21 may extend in a curved line along the side edge 19s, and more preferably extends adjacent to the side edge 19s.
Since the wearer's legs (inner thighs) have a rounded shape, the above configuration allows the side edge portion 19s to have a shape that conforms to the roundness of the leg. Thereby, external force from the wearer is suppressed from being applied locally to a portion of the side edge 19s, and stress on the side edge 19s is more easily dispersed. Therefore, the deformation suppressing effect is more reliably exerted over the entire low basis weight region 19, and undesirable deformation of the high basis weight region 18 is suppressed even more effectively.

Moreover, in order to realize the absorbent body 11 as shown in FIG. 11, an absorbent core 16 as shown in FIG. 12 can be used. In the absorbent core 16 shown in FIG. 12, the intermediate core portion 24 is formed narrowly, and the side edge portion 27s of the low basis weight portion 27 in the lateral direction Y has a curved shape convex toward the center side in the lateral direction Y. configured. With such an absorbent core 16, the basis weight of the ultra-low basis weight region 20 is configured to be lower than the low basis weight region 19, and the side edge portion 19s of the low basis weight region 19 is convex toward the center side in the lateral direction Y. It is constructed in a curved shape.

[Specific examples of core wrap sheet materials]
The core wrap sheet 17 is formed of, for example, a thin paper material or a nonwoven fabric, and is particularly preferably formed of a nonwoven fabric.
Nonwoven fabrics are typically more elastic than paper materials. Therefore, by forming the loop portion 22 from a nonwoven fabric, the loop portion 22 easily deforms in response to an external force from the outside in the lateral direction Y, and returns to its original shape when the external force is removed. It has an easy configuration. Therefore, the buffering effect of the loop portion 22 against external forces is enhanced, and deformation of the high basis weight region 18 is more reliably suppressed.

Specifically, as the nonwoven fabric constituting the core wrap sheet 17, nonwoven fabrics commonly used for absorbent articles can be used, such as spunbond nonwoven fabric, meltblown nonwoven fabric, thermal bonded nonwoven fabric, needle punched nonwoven fabric, and spunlace nonwoven fabric. , nonwoven fabrics such as air-laid nonwoven fabrics; or composite sheets in which two or more of these are laminated. The composite sheet is preferably one in which each sheet is integrated into a single sheet by entanglement and/or thermal fusion of constituent fibers of each sheet.
The nonwoven fabric may contain thermoplastic fibers and/or other fibers as constituent fibers.
Examples of thermoplastic fibers include single fibers formed using a single synthetic resin such as polyethylene, polypropylene, polyester, and polyurethane, or single fibers formed using synthetic resins such as a composite of two or more of these resins. Composite fibers can be used. Examples of the composite fiber include core-sheath type, side-by-side type, and other composite fibers formed using two or more types of synthetic resins.
Other fibers used in nonwoven fabrics include, for example, wood pulps such as softwood pulp and hardwood pulp; natural fibers such as non-wood pulps such as cotton pulp and hemp pulp; modified pulps such as cationized pulp and mercerized pulp; and cupra. , recycled fibers such as rayon; semi-synthetic fibers such as athate; hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers; hydrophilic treatment of synthetic fibers such as polyethylene terephthalate fibers, polyethylene fibers, polypropylene fibers, and polyester fibers. Examples include fibers made of

Furthermore, when the core wrap sheet 17 is formed of a nonwoven fabric containing thermoplastic fibers, the core wrap joint portion 21 is preferably joined using hot melt adhesive, heat sealing, or ultrasonic sealing. By heat sealing or ultrasonic sealing, the thermoplastic fibers contained in the nonwoven fabric can be melted by heat or ultrasonic waves, and the nonwoven fabrics can be bonded well.

[Example of configuration of wing section and ultra-low basis weight region]
As shown in FIG. 2, the napkin 1 preferably includes a pair of wing portions W. As shown in FIG. The wing portion W is folded back onto the outer surface of the crotch of the underwear when the napkin 1 is attached to the underwear, and is fixed by the wing adhesive portion 29. That is, by wearing the wing portion W, the vicinity of the boundary between the wing portion W and the main body M (that is, the base Wa of the wing portion W) is fixed so as to be pulled toward the underwear side.
By disposing the ultra-low basis weight region 20 near the base Wa of the wing portion W, when worn, the ultra-low basis weight region 20 is relatively disposed on the non-skin side in the thickness direction Z, and the high basis weight region 18 It becomes relatively easy to swell toward the skin side in the thickness direction Z.

From this point of view, as shown in FIG. 13, the length L1 of the ultra-low basis weight region 20 in the longitudinal direction X is preferably longer than the length L2 of the wing portion W in the longitudinal direction X.
The length L1 of the ultra-low basis weight region 20 in the longitudinal direction X means the longest length of the ultra-low basis weight region 20 in the longitudinal direction X. The length L2 of the wing portion W in the vertical direction X means the length of the wing portion W in the vertical direction X at the base Wa of the wing portion W.

In the above configuration, the ultra-low basis weight region 20 is arranged over at least the entire length of the wing portion W in the longitudinal direction. Thereby, the ultra-low basis weight region 20 is easily pressed against the underwear side (that is, the non-skin side in the thickness direction Z) as the wing portion W is attached. Accordingly, the high basis weight region 18 on the center side in the lateral direction Y becomes relatively easy to swell toward the skin side in the thickness direction Z. Therefore, in the excretion part facing area M2, the high basis weight area 18 bulges toward the excretion part, and it becomes easier to fit the excretion part even better. Moreover, since the external force from the lateral direction Y is buffered by the ultra-low basis weight region 20, the preferable shape of the high basis weight region 18 is maintained, and high fit is maintained.

[Example of configuration of adhesive part and core wrap joint]
As shown in FIGS. 3 and 4, the main body M is fixed to the inner surface of the underwear by the main body adhesive part 15. On the other hand, the loop portion 22 of the ultra-low basis weight region 20 is deformed by external force in the lateral direction Y, and exhibits a buffering effect against the external force. For this reason, it is preferable that the loop portion 22 be designed to have a high degree of freedom in deformation without being fixed to the underwear.
For this reason, as shown in FIG. 4, it is preferable that the outer side edge 15s of the main body adhesive part 15 in the lateral direction Y be arranged to overlap with the core wrap joint part 21 in a plan view. In addition, in FIG. 4, in order to clarify the arrangement of the core wrap joint 21, the core wrap joint 21 is shown by diagonal hatching.

When the main body M has a plurality of divided main body adhesive parts 15 or an intermittently coated main body adhesive part 15, "the outer side edge 15s in the lateral direction Y of the main body adhesive part 15" is the main body adhesive part 15. 15, which are located at the outermost side in the lateral direction Y (left side and right side).
"The side edge 15s overlaps the core wrap joint 21 in a plan view" means that at least a portion of the side edge 15s overlaps the core wrap joint 21 in a plan view.
As shown in FIG. 4, it is more preferable that the outer side edge 15s of the main body adhesive part 15 in the lateral direction Y is arranged so as to overlap with the core wrap joint part 21 over the entire length of the excretion part facing region M2 in the longitudinal direction X.

In the above configuration, since the loop portion 22 is not fixed to the underwear, it is flexibly deformed by an external force in the lateral direction Y, and a buffering effect against the external force is easily exerted. On the other hand, since the core wrap joint part 21 is fixed to the underwear by the main body adhesive part 15, the position of the core wrap joint part 21 is stabilized, and the base of the loop part 22 is stabilized. This suppresses the formation of wrinkles or the like that would inhibit deformation in the loop portion 22, making it easier for the loop portion 22 to exhibit a more stable buffering effect.

[Example of configuration of three-dimensional gathers and core wrap joint]
As shown in FIGS. 1 to 3, three-dimensional gathers G are arranged on the lateral Y side of the main body M. The three-dimensional gathers G are configured to be able to stand up by contracting in the vertical direction X. Therefore, the area near the three-dimensional gathers G of the main body M becomes easily influenced by the three-dimensional gathers G.
From the viewpoint of effectively exerting the external force buffering effect of the loop portion 22 while suppressing the influence of the three-dimensional gathers G, the three-dimensional gathers G preferably have the following configuration.

In the example shown in FIGS. 2 and 3, the three-dimensional gathers G are formed by folding the center side of the side sheet 14 disposed on the side of the main body M in the horizontal direction Y to the outside in the horizontal direction Y. Note that the sheet material forming the three-dimensional gathers G is not limited to the side sheet 14, and may be a sheet material separate from the side sheet 14.

As shown in FIG. 2, the three-dimensional gathers G includes, for example, a standing portion 30 that can stand up from the main body M in the thickness direction Z, and non-standing portions 31 that are arranged in front and behind the standing portion 30 in the longitudinal direction X. have The upright portion 30 is a portion of the folded portion of the side sheet 14 that is not joined to the main body M. On the other hand, the non-standing portion 31 is a portion of the folded portion that is joined to the main body M and is prevented from rising in the thickness direction Z.

As shown in FIGS. 2 and 3, the upright portion 30 includes an elastic member 30e that is stretchable in the vertical direction X. As shown in FIGS. The elastic member 30e is made of, for example, a thread-like or band-like elastic member. The upright portion 30 may include a plurality of elastic members 30e. "The elastic member 30e is stretchable in the vertical direction X" means that the elastic member 30e as a whole is arranged so as to be stretchable in the vertical direction . The elastic member 30e is attached to the side sheet 14, which is stretched in the XY plane, while being stretched in the longitudinal direction. Thereby, when worn, the main body M is curved in the vertical direction X due to contraction of the standing portion 30, so that the standing portion 30 stands up from the main body M toward the skin side. Therefore, liquid leakage in the lateral direction Y is suppressed by the upright portion 30.

As shown in FIGS. 2 and 3, the upright portion 30 further includes a base end portion 30s that constitutes an end portion on the main body M side. As shown in FIG. 2, the base end portion 30s constitutes a side edge portion of the upright portion 30 on the center side in the lateral direction Y in a state in which the three-dimensional gathers G are extended on the XY plane. Further, as shown in FIG. 3, the base end portion 30s is a portion where the upright portion 30 starts to stand up from the main body M.

As shown in FIG. 14, the base end portion 30s is preferably arranged to overlap the core wrap joint portion 21 in plan view. "The base end 30s overlaps the core wrap joint 21 in a plan view" means that at least a portion of the base end 30s overlaps the core wrap joint 21 in a plan view. In addition, in FIG. 14, in order to clarify the arrangement of the core wrap joint 21, the core wrap joint 21 is shown by diagonal hatching.

As described above, since the upright portion 30 contracts in the vertical direction X, wrinkles extending in the horizontal direction Y are likely to be formed. Furthermore, although the napkin 1 is generally folded in the longitudinal direction X and individually packaged, wrinkles are likely to be formed in the upright portion 30 due to the fold lines in this package.
In the above configuration, the base end portion 30s, which is likely to be affected by the wrinkles of the upright portion 30 on the main body M, is arranged so as to overlap the core wrap joint portion 21. Thereby, the loop portion 22 and the low basis weight region 19 are less susceptible to the effects of wrinkles caused by the standing portions 30. Therefore, the degree of freedom of deformation of the loop portion 22 and the low basis weight region 19 is further increased, and the buffering effect of the external force by the loop portion 22 and the low basis weight region 19 is more effectively exerted.

[Specific example of basis weight of each region of absorber]
The basis weight of the high basis weight region 18 is preferably 500 g/m ² or more, more preferably 600 g/m ² or more, and preferably 1200 g, from the viewpoint of ensuring sufficient absorbency and good wearing comfort. /m ² or less, more preferably 1000 g/m ² or less.
The basis weight of the low basis weight region 19 is preferably 200 g/m ² or more, more preferably 300 g/m ² from the viewpoint of ensuring absorbency and flexibility to exhibit the above-mentioned deformation suppressing effect. or more, preferably 800 g/m ² or less, more preferably 700 g/m ² or less.
The basis weight of the ultra-low basis weight region 20 is preferably 100 g/m ² or less, more preferably 50 g/m ^{2 or} less, from the viewpoint of ensuring sufficient flexibility to exhibit the above-mentioned deformation suppressing effect.
In the absorbent core 16, the basis weight of the high basis weight portion 26 is preferably 400 g/m ² or more, more preferably 500 g/m ² or more, from the viewpoint of obtaining the high basis weight region 18 having the basis weight in the above-mentioned range. It is preferably 1000 g/m ² or less, more preferably 900 g/m ² or less.
The basis weight of the low basis weight portion 27 is preferably 100 g/m ² or more, more preferably 200 g/m ² or more, and preferably 700 g from the viewpoint of obtaining the low basis weight region 19 having the basis weight in the above-mentioned range. /m ² or less, more preferably 600 g/m ² or less.
The basis weight of the front core part 23 and the rear core part 25 is preferably 90 g/m ² or more, more preferably 100 g/m ² or more, and preferably 500 g/m ² or less, more preferably 450 g/m ² or less. be.
In addition, as described later, when the absorbent core 16 has grooves with a low basis weight, the basis weight and thickness of each region of the absorbent core 11 are the basis weight of the part excluding the grooves (i.e., the block part). and thickness. Hereinafter, unless otherwise specified, the thickness and basis weight of the absorbent body 11 are the same as described above.

[Method of measuring basis weight of each region of absorber]
The measurement target area of the absorber 11 is cut using a single-edged razor manufactured by Feather Co., Ltd. to obtain small pieces having a predetermined area. The weight of these small pieces is measured using an electronic balance (electronic balance GR-300 manufactured by A&D Co., Ltd., accuracy: 4 digits after the decimal point). The basis weight of each piece is calculated by dividing the obtained weight by the area of each piece. For each region of the absorbent body 11, the average basis weight of five small pieces is taken as the basis weight.

[Method of measuring the basis weight of each area of the absorbent core]
The basis weight of each region of the absorbent core 16 can be measured using a small piece obtained when measuring the basis weight of each region of the absorbent core 11. Specifically, the core wrap sheets 17 placed above and below the small piece cut from the absorbent body 11 are removed. The weight of the small piece of the absorbent core 16 from which the core wrap sheet 17 has been removed is measured using the electronic balance described above. The basis weight of each piece of the absorbent core 16 is calculated by dividing the obtained weight by the area of each piece. For each region of the absorbent core 16, the average basis weight of five small pieces is taken as the basis weight.

[Specific examples of the thickness of each region of the absorbent core]
The thickness of the absorbent core 16 in the thickness direction Z can be set in consideration of the basis weight.
The thickness of the high basis weight portion 26 in the thickness direction Z is preferably 3 mm or more, more preferably 5 mm or more, and preferably 15 mm or less, more preferably 13 mm or less.
The thickness of the low basis weight portion 27 in the thickness direction Z is preferably 2 mm or more, more preferably 3 mm or more, and preferably 12 mm or less, more preferably 10 mm or less.
The thickness of the front core part 23 and the rear core part 25 is preferably 2 mm or more, more preferably 2.5 mm or more, and preferably 10 mm or less, more preferably 9 mm or less.

[Method for measuring the thickness of each region of the absorbent core]
The thickness of the absorbent core 16 to be measured is measured by measuring the thickness of a small piece cut out to measure the basis weight of each part. The measuring portion of a small piece cut out from an absorbent article is pressurized for 10 minutes at a pressure of 5 kPa, and the measurement is performed immediately after weight removal. An acrylic plate with a size of 20 mm x 20 mm and a thickness of 3 mm was placed on the central area of the sample after weight removal, and a non-contact laser displacement meter (laser head LK-G30, displacement meter LK-GD500) manufactured by KEYENCE was used. Measure the thickness of the sample. If the size of the cut 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 It may be observed and measured at twice the magnification.

[Specific examples of dimensions in the vertical and horizontal directions of each region of the absorbent body]
The maximum width of the high basis weight region 18 in the lateral direction Y is preferably 15 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, from the viewpoint of obtaining good fit while ensuring sufficient absorbency. More preferably, it is 50 mm or less.
The minimum width in the lateral direction Y between both side edges 19s of the low basis weight region 19 is preferably 40 mm or more, more preferably 40 mm or more, from the viewpoint of giving a sense of security to the wearer and effectively exerting a buffering effect against external forces. The length is 50 mm or more, preferably 75 mm or less, and more preferably 70 mm or less.
The maximum width of each loop portion 22 in the lateral direction Y is preferably 10 mm or more, more preferably 15 mm or more, from the viewpoint of providing the loop portion 22 with a width that can sufficiently tolerate deformation and ensuring the absorbency of the absorbent core 16. It is preferably 30 mm or less, more preferably 25 mm or less. Note that "the width of each loop portion 22 in the lateral direction Y" means the width from the outer side edge of the core wrap joint 21 in the lateral direction Y to the side edge 11s of the absorber 11.
The total length of the high basis weight region 18 in the longitudinal direction Preferably it is 180 mm or less, more preferably 170 mm or less.
The total length of the loop portion 22 in the vertical direction X is preferably 60 mm or more, more preferably 80 mm or more, from the viewpoint of having a length that can sufficiently absorb external force from the wearer's legs and also being able to cope with misalignment of the wearing position. and is preferably 180 mm or less, more preferably 170 mm or less.
The widths D1 and D3 of the front core part 23 and the rear core part 25 are preferably 60 mm or more, more preferably 70 mm or more, and preferably 100 mm or less, more preferably 90 mm or less.
The width D2 of the narrowest part of the intermediate core portion 24 is preferably 40 mm or more, more preferably 40 mm or more, from the viewpoint of having a sufficient width to give the wearer a sense of security and effectively exerting a buffering effect against external forces. The length is 50 mm or more, preferably 75 mm or less, and more preferably 70 mm or less.

[Specific example of planar shape of high basis weight area]
As shown in FIG. 5, the high basis weight region 18 preferably has a front end portion 18a whose width in the lateral direction Y gradually decreases toward the front in the longitudinal direction X, and a width in the lateral direction Y toward the rear in the longitudinal direction X. and a gradually decreasing rear end portion 18b.
It is preferable that the absorbent body 11 fits so as to bulge toward the excretion part in the excretion part facing region M2, while in the front region M1 and the rear region M3, the absorber 11 has a curved shape in front of the excretion part and a rear buttock. It is preferable that the body shape is deformed in accordance with the shape of the body, such as the shape of the body. Since the high basis weight region 18 has the front end portion 18a and the rear end portion 18b having the above-mentioned configuration, the raised shape of the high basis weight region 18 is maintained in the excretion part facing region M2, and the raised shape is formed in front and behind the high basis weight region 18. The propagation of the influence is suppressed. Therefore, the absorbent core 11 is easily deformed into a shape that conforms to the shape of the body in front and behind the excretory part.
As shown in FIG. 5, the front end portion 18a and the rear end portion 18b may have a circular arc shape or an elliptical arc shape. Alternatively, the front end portion 18a and the rear end portion 18b may have a triangular shape with an acute angle at the tip, a trapezoid shape including sides along the horizontal direction Y at the tip, a rectangular shape with rounded corners, or the like.
Note that the front end portion 18a and the rear end portion 18b may not have a shape in which the width gradually decreases toward the tip, but may be configured as a whole into a rectangular shape with substantially the same width.

[Example of arrangement of compression grooves]
As shown in FIG. 3, the compression groove E may be arranged in the low basis weight region 19 in the excretion part facing region M2, and may be arranged closer to the center in the lateral direction Y than the side edge 19s, for example. . The compressed grooves E can form a high-density region in the low basis weight region 19 that is denser than the surrounding area.
With the above configuration, the rigidity increases in the order of the vicinity of the side edge 19s of the low basis weight region 19, the region where the compression groove E is formed, and the high basis weight region 18. In this way, by increasing the rigidity of the low basis weight region 19 stepwise from the side edge 19s toward the high basis weight region 18, the high basis weight region 18 can be reliably deformed from a region farther away. In other words, it is possible to avoid simultaneous deformation of the entire low basis weight region 19 when external force is applied. Thereby, the effect of suppressing deformation of the high basis weight region 18 can be further enhanced.

[Example of configuration of low basis weight groove of absorbent core]
As shown in FIG. 8, the absorbent core 16 further includes a vertical groove portion 32 with a low basis weight extending in the vertical direction X, and a lateral groove portion 33 with a low basis weight extending in the horizontal direction Y. In the example shown in FIG. 8, the absorbent core 16 has a plurality of longitudinal grooves 32 and a plurality of lateral grooves 33, and is divided into blocks by these. In these grooves, "extending in the vertical direction X" or "extending in the horizontal direction Y" may mean that the entire groove extends in the vertical direction shall be included. For example, in the example shown in FIG. 8, a portion of the vertical groove portion 32 extends along the side edge of the high basis weight portion 26 in the horizontal direction Y.
These grooves may include, for example, grooves formed downward from the upper surface in the thickness direction Z of the absorbent core 16, or grooves formed upward from the lower surface in the thickness direction Z, as shown in FIG. It may also include grooves. Note that the "low basis weight" of the vertical grooves 32 and the horizontal grooves 33 is a concept that includes a form in which the constituent material of the absorbent core 16 is present as well as a form in which the constituent material of the absorbent core 16 is not present.
Note that in the schematic cross-sectional views of the absorbent body 11 such as in FIG. 6, illustration of the vertical groove portions 32 and the horizontal groove portions 33 is omitted.
Since the absorbent core 16 has the vertical grooves 32 and the horizontal grooves 33, the napkin 1 can be easily deformed into a preferred shape. Thereby, the fit for the wearer can be further improved.

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

In the above embodiments, a sanitary napkin was shown as an example of the absorbent article, but the absorbent article is not limited thereto. The absorbent article of the present invention may be, for example, a urine absorbing pad, a discharge sheet, a disposable diaper, or the like.

1... Napkin (absorbent article)
11...Absorbent body 12...Top sheet 13...Back sheet 16...Absorbent core 17...Core wrap sheet 18...High basis weight area 19...Low basis weight area 20...Ultra low basis weight area 21...Core wrap joint portion 22...Loop portion M...Main body M1...Anterior area M2...Excretory part opposing area M3...Back area

Claims (9)

A main body including a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and a vertical direction corresponding to the front-back direction of the wearer and a direction perpendicular to the vertical direction. An absorbent article having a lateral direction and a thickness direction perpendicular to the longitudinal direction and the lateral direction,
The absorber is
an absorbent core;
A core wrap sheet that covers the absorbent core and includes a surface region disposed on the top sheet side of the absorbent core and a back region disposed on the back sheet side of the absorbent core. ,
The main body is divided along the longitudinal direction into a front region, an excretion part facing region, and a rear region,
The absorber further includes:
a high basis weight region located on the lateral center side of the excretion part facing region; and a low basis weight region located on the lateral outside of the high basis weight region and having a lower basis weight than the high basis weight region. , an ultra-low basis weight region located laterally outside the low basis weight region and having a lower basis weight than the low basis weight region,
The ultra-low basis weight region is
a core wrap joint where the front surface region and the back surface region are joined in the thickness direction and extend in the longitudinal direction;
An absorbent article including: a loop portion located on the lateral outer side of the core wrap joint portion, and in which the front surface region and the back surface region are seamlessly connected. The absorbent article according to claim 1, wherein the ultra-low basis weight region is constituted by the core wrap sheet. The absorbent article according to claim 1 or 2, wherein the core wrap joint extends adjacent to a side edge in the lateral direction of the low basis weight region. The absorbent article according to any one of claims 1 to 3, wherein the core wrap joint portion has a linear shape that extends continuously in the longitudinal direction. The side edges of the low basis weight region in the lateral direction have a curved shape convex toward the center in the lateral direction,
The absorbent article according to any one of claims 1 to 4, wherein the core wrap joint extends in a curved shape along the side edge. The absorbent article according to any one of claims 1 to 5, wherein the core wrap sheet is formed of a nonwoven fabric. The absorbent article includes:
further comprising a pair of wing parts protruding outward in the lateral direction from the excretion part facing area of the main body,
The absorbent article according to any one of claims 1 to 6, wherein the length of the ultra-low basis weight region in the longitudinal direction is longer than the length of the wing portion in the longitudinal direction. The main body further includes an adhesive part disposed on the outer surface of the back sheet,
The absorbent article according to any one of claims 1 to 7, wherein the lateral outer side edge portion of the adhesive portion is arranged to overlap with the core wrap joint portion in plan view. The absorbent article includes:
further comprising a pair of three-dimensional gathers arranged on the lateral sides of the main body,
The three-dimensional gathers are
The elastic member includes the elastic member that can be expanded and contracted in the longitudinal direction, and a base end that constitutes the end on the main body side, and has a standing part that can stand up from the main body in the thickness direction,
The absorbent article according to any one of claims 1 to 8, wherein the base end portion is arranged to overlap with the core wrap joint portion in plan view.

Images