JP2019205781A - Pad-shaped absorbent article - Google Patents

Abstract

To provide a pad-shaped absorbent article having high fitting property.SOLUTION: A pad-shaped absorbent article comprises a liquid permeable surface sheet, a rear surface sheet, an absorber and an adhesive part, and has a vertical direction corresponding to the longitudinal direction of a wearer, and a lateral direction orthogonal to the vertical direction. The absorbent core has a front core part, a rear core part, and an intermediate core part positioned between the front core part and the rear core part, and formed narrower than the front core part and the rear core part by a pair of constriction areas. The intermediate core part is constituted so that a front half part and a rear half part divided by a straight line dividing into two in the vertical direction become mutually asymmetrical about the straight line. The adhesive part includes a pair of lateral direction peripheral edge parts passing through the front half part, the pair of constriction areas, and the rear half part and extending in the vertical direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pad-like absorbent article such as a sanitary napkin.

  2. Description of the Related Art Absorbent articles of a type that are used inside clothing (underwear) such as sanitary napkins are known. In such type of absorbent article, in order to prevent the absorbent article from being displaced during wearing, a slip stopper for fixing the absorbent article to the clothing is provided (for example, see Patent Document 1). .

JP-A-2015-97718

  Absorbent articles such as sanitary napkins typically have a width that is wider than a person's crotch width. For this reason, when an external force is applied from the left and right outer sides to the inner side in the width direction at the time of wearing, the central region of the absorbent core is deformed so as to reduce the fit with the excretion region, and liquid leakage is likely to occur. In addition, even when the absorbent article is fixed to the garment by the slip prevention material, the garment is often less rigid than the absorbent core, so it is difficult to suppress deformation of the absorbent core. For this reason, the technique which suppresses a deformation | transformation of an absorptive core with respect to external force is desired.

  The subject of this invention is related with the pad-shaped absorbent article with high fitting property.

A pad-shaped absorbent article according to an embodiment of the present invention includes a liquid-permeable top sheet, a back sheet, an absorbent body having an absorbent core and disposed between the top sheet and the back sheet, and the back sheet. A longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular to the longitudinal direction.
The absorbent core is positioned between the front core portion and the rear core portion, and between the front core portion and the rear core portion, and is formed narrower than the front core portion and the rear core portion by a pair of constricted regions. An intermediate core portion.
The intermediate core portion is configured such that a first half portion and a second half portion divided by a straight line that bisects in the vertical direction are asymmetric with respect to the straight line.
The adhesive portion includes a pair of lateral peripheral edges extending in the longitudinal direction through the front half portion, the pair of constricted regions, and the rear half portion, respectively.

  As described above, according to the pad-like absorbent article of the present invention, it is possible to improve fit.

It is a top view which shows the pad-shaped absorbent article of one Embodiment of this invention. It is sectional drawing cut | disconnected by the II-II line | wire of FIG. It is a top view which shows the absorptive core of the said pad-like absorbent article. It is the top view which looked at the above-mentioned pad-like absorbent article from the back sheet side. It is a typical enlarged plan view which shows the intermediate core part of the said absorptive core, and the adhesion part provided in the said back surface sheet. It is a typical enlarged plan view which shows the shape of the absorptive core and adhesion part which concern on the other structural example of this embodiment. It is a typical enlarged plan view which shows the shape of the absorptive core and adhesion part which concern on the other structural example of this embodiment. It is a typical enlarged plan view which shows the shape of the absorptive core and adhesion part which concern on the other structural example of this embodiment. It is a typical enlarged plan view which shows the shape of the absorptive core and adhesion part which concern on the other structural example of this embodiment. It is a typical enlarged plan view which shows the shape of the absorptive core and adhesion part which concern on the other structural example of this embodiment. It is a typical side view of the said absorptive core. It is a top view of the said absorber. It is a partial enlarged plan view of the pad-like absorbent article, and is a view schematically showing a configuration of a surface sheet. It is a perspective view of the said surface sheet. It is an expanded sectional view which shows a part of cross section cut | disconnected by the XV line | wire of FIG.

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

[Overall structure of napkin]
The pad-shaped absorbent article 1 shown in FIG. 1 includes a main body M, a pair of wing parts W, a pair of side guards G, a pair of rear flap parts F, and a pressing groove part E. The pad-like 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 wearer's front-rear direction and a horizontal direction Y corresponding to the wearer's left-right direction 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. In addition, in this specification, regarding the thickness direction Z, the side close to the wearer's skin may be referred to as “up” and the side close to the clothing may be referred to as “down”. The napkin 1 may be used at bedtime, and may have a length of 30 cm or more along the longitudinal 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 to be described later and has a function of absorbing a liquid material (hereinafter also referred to as “liquid”) such as menstrual blood of the wearer.

The wing portion W is configured to protrude greatly from the main body M outward in the lateral direction Y.
The side guard G is disposed so as to extend in the vertical direction X at the peripheral edge of the main body M in the horizontal direction Y.
The rear flap portion F is configured to bulge outward in the lateral direction Y at the rear portion of the main body M.
The napkin 1 may not have at least one of the wing part W, the side guard G, and the rear flap part F.

  The compressed groove portion E is a linear groove portion that is formed by being compressed in the thickness direction Z downward from the surface sheet 12 described later. The compressed groove E is configured so as to surround the peripheral edge of the main body M, for example. The pressing groove E has a function of guiding the liquid by a high capillary force, preventing leakage of the liquid to the outside of the main body M, and joining the top sheet 12 and the absorber 11 described below. In addition, the pressing groove part E is not limited to the shape shown in FIG.

  As shown in FIG. 2, the napkin 1 includes an absorbent body 11, a top sheet 12, a back sheet 13, a pair of side sheets 14, and an adhesive portion 15. 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 laminated in the thickness direction Z. These structures are appropriately joined and integrated by, for example, joining using an adhesive, heat sealing, or the like, and embossing using the compressed groove E.

The absorber 11 extends along the vertical 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 surface sheet 12 side and diffuses the liquid inside to hold the liquid.
The absorbent body 11 has an absorbent core 16 and a core wrap sheet 17.
The absorbent core 16 may be formed of, for example, a fiber assembly composed of hydrophilic fibers such as pulp fibers, or may have a configuration in which a water-absorbing polymer is held in the fiber assembly. .
The core wrap sheet 17 covers the absorbent core 16 and has, for example, a function of maintaining the shape of the absorbent core 16. The core wrap sheet 17 is made of, for example, tissue paper-like thin and soft paper, liquid-permeable nonwoven fabric, or the like.
Details of the absorber 11 will be described later.

  The top sheet 12 is configured as a liquid-permeable sheet material, and is disposed above the thickness direction Z of the absorber 11. In addition, between the surface sheet 12 and the absorber 11, the improvement of the permeability | transmittance of the liquid from the surface sheet 12 to the absorber 11, prevention of the liquid return to the surface sheet 12 of the liquid absorbed by the absorber 11, etc. From this point of view, a second sheet (sublayer sheet) may be disposed.

The back sheet 13 is disposed below the thickness direction Z of the absorber 11. 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 by 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, a laminate of the film and a nonwoven fabric, or the like can be used. Such a back sheet 13 has lower rigidity than the absorbent core 16.

  The pair of side sheets 14 oppose each other in the left-right direction with the top sheet 12 interposed therebetween, and are disposed on the periphery in the lateral direction Y of the napkin 1. In the present embodiment, the side seat 14 constitutes the side guard G by folding the peripheral edge in the lateral direction Y outward. The side sheet 14 is bonded to the top sheet 12 with an adhesive or the like at the base of the side guard G.

The adhesion part 15 is provided in the outer surface of the back surface sheet 13, and has a function as a slip prevention material which fixes the napkin 1 with respect to clothes.
The adhesive part 15 is formed, for example, by applying an adhesive to the back sheet 13 in a predetermined pattern. As the pressure-sensitive adhesive used for the pressure-sensitive adhesive portion 15, a hot-melt pressure-sensitive adhesive such as rubber, olefin, or ethylene vinyl acetate (EVA) is preferably used.
In this embodiment, the adhesion part 15 shall say the coating film of the adhesive formed in the main body M. 2 and 4, the napkin 1 may include a wing adhesive portion 18 provided in the wing portion W as an adhesive coating film similar to the adhesive portion 15, and further rearward. You may provide the back flap adhesion part 19 provided in the flap part F. FIG.

[Configuration of absorbent core]
As shown in FIG. 3, the absorbent core 16 has a front core part 20, an intermediate core part 21, and a rear core part 22. The front core part 20, the intermediate core part 21, and the rear core part 22 are arranged along the vertical direction X, and the intermediate core part 21 is located between the front core part 20 and the rear core part 22. The intermediate core part 21 is an area | region which opposes a wearer's excretion area | region, and the front core part 20 and the back core part 22 are parts which oppose the front and back of a wearer's excretion area | region, respectively. The absorbent core 16 has a plane shape that is symmetrical in the lateral direction Y.

The intermediate core portion 21 is configured to be narrower than the front core portion 20 and the rear core portion 22 by a pair of constricted regions 21s.
As shown in FIG. 3, the constricted region 21 s is a space region in which the core material constituting the absorbent core 16 does not exist, and is partitioned by the core wrap sheet 17 in the present embodiment as described later. Although the main body of the core material does not exist in the constricted region 21s, even if a part of the fiber protruding outward from the peripheral edge of the absorbent core 16 or a part of the core material separated from the absorbent core 16 exists. Good.

The width dimension D1 in the lateral direction Y of the front core portion 20 and the width dimension D3 in the lateral direction Y of the rear core portion 22 may be the same or different, and in the example shown in FIG. The width dimension D1 of the front core part 20 and the width dimension D3 of the rear core part 22 shall mean the maximum width dimension in the horizontal direction Y.
In the example shown in FIG. 3, the width dimension D1 of the front core part 20 and the width dimension D3 of the rear core part 22 are constant along the vertical direction X, but they may not be constant. Note that “a constant width” in a certain region means that the difference in width dimension within each region is 20% or less when the minimum width in the horizontal direction Y of the region is 100%.
The length dimension in the longitudinal direction X of the front core part 20 and the rear core part 22 may be the same or different. For example, the rear core part 22 is configured to be longer.

In the example shown in FIG. 3, the intermediate core portion 21 has a tapered shape at the front and rear end portions, and has a narrow region 23 in which the width dimension is minimized at the intermediate portion in the vertical direction X. The width dimension D2 of the narrow region 23 is smaller than the width dimension D1 of the front core part 20 and the width dimension D3 of the rear core part 22, and is configured to be constant along the vertical direction X.
The width dimension D2 of the narrow region 23 is formed to be larger than, for example, a general wearer's crotch width (about 30 mm). As an example of such a dimension, it is 40 mm or more and 75 mm or less, Preferably, it is 50 mm or more and 70 mm or less. Thereby, while the intermediate core part 21 has sufficient width | variety and can give a feeling of security with respect to a wearer, it can make it easy to comprise narrower than the front core part 20 and the back core part 22. FIG. .

  By configuring the intermediate core portion 21 to be narrower than the front core portion 20 and the rear core portion 22, it is possible to reduce the influence of external force applied from the wearer's leg toward the inner side in the lateral direction Y. . Thereby, it can suppress that the intermediate core part 21 compresses and deforms in the horizontal direction Y by the said external force, and can prevent that a clearance gap generate | occur | produces between a wearer. Therefore, the fitting property of the napkin 1 can be improved, and the excreted liquid can be prevented from leaking out of the napkin 1 through the gap.

[Planar shape of intermediate core portion 21]
As shown in FIG. 3, the intermediate core portion 21 is configured such that a front half portion 21 a and a rear half portion 21 b divided by a straight line L that is equally divided into two in the vertical direction X are asymmetric with respect to the straight line L. Thereby, the shape of the outer edge of the horizontal direction Y mutually differs in the front half part 21a and the latter half part 21b.

In the intermediate core portion 21 shown in FIG. 3, the rear half portion 21b has a gentler taper shape than the front half portion 21a. Thereby, in the intermediate core part 21, the rear half part 21b has a larger area in plan view than the front half part 21a.
The “area in plan view” refers to the area projected on the plane when the napkin 1 is extended on a plane composed of the vertical direction X and the horizontal direction Y.

In addition to the narrow region 23, the intermediate core portion 21 includes a front taper region 24 whose width dimension gradually increases toward the front core portion 20, a rear taper region 25 whose width dimension gradually increases toward the rear core portion 22, including.
The front taper region 24 is formed in the front half portion 21a, and the rear taper region 25 is formed in the rear half portion 21b. However, the configuration is not limited to this, and the rear taper region 25 may be formed from the front half portion 21a (see FIG. 7).

  The rear taper region 25 is configured so that the increase amount of the width dimension per unit length is smaller than that of the front taper region 24. The amount of increase in the width dimension per unit length in the front taper region 24 is from the maximum width dimension (for example, the width dimension D1 of the front core portion 20) of the front taper area 24 to the minimum width dimension (for example, the width dimension D2 of the narrow region 23). ) Can be calculated by dividing by the length dimension D4 of the front taper region 24. Similarly, the amount of increase in the width dimension per unit length in the rear taper region 25 is from the maximum width dimension (for example, the width dimension D3 of the rear core portion 22) of the rear taper region 25 to the minimum width dimension (for example, the narrow region 23). The value obtained by subtracting the width dimension D2) can be calculated by dividing the value by the length dimension D5 of the rear taper region 25.

  In the example shown in FIG. 3, the maximum width dimension D1 of the front taper region 24 and the maximum width dimension D3 of the rear taper region 25 are the same, and the minimum width dimension D2 of the front taper region 24 and the rear taper region 25 is the same. Is the same. For this reason, the length dimension D5 of the rear taper region 25 is configured to be larger than the length dimension D4 of the front taper region 24.

As described above, the intermediate core portion 21 shown in FIG. 3 has a shape in which the width suddenly widens in the front taper region 24 and has a shape in which the width gradually widens in the rear taper region 25. Thereby, the front taper area | region 24 becomes a shape fitted to the groin part which a width | variety spreads rapidly toward the front (upward) from the narrow excretion area | region in a wearer. On the other hand, the rear taper region 25 has a shape that fits the buttocks that gradually increase in width from the excretion region. Therefore, the napkin 1 can be made into the shape along a wearer's body shape, and the fit property and wear feeling of the napkin 1 can be improved.
In addition to this, by providing the following adhesive portion 15 on the back sheet 13, the compressive deformation of the absorbent core 16 during wearing can be effectively prevented, and the fit of the napkin 1 can be further enhanced.

[Configuration of adhesive section]
As shown in FIGS. 4 and 5, the adhesive portion 15 is composed of, for example, two strip-like adhesive patterns 15 n along the vertical direction X. Each adhesive pattern 15 n extends from the front core portion 20 to the rear core portion 22 while being spaced apart in the lateral direction Y.
In addition, in FIG. 4, the adhesion part 15 provided in the back surface sheet 13 is each shown with the dashed-dotted line, and the absorptive core 16 is shown with the broken line, respectively. In FIG. 5, the absorbent core 16 is indicated by a solid line, the outline of the adhesive portion 15 overlapping therewith is indicated by a broken line, and the formation region of the adhesive portion 15 is indicated by a diagonal line. Further, in FIG. 5, in view of the left-right symmetry in the lateral direction Y of the adhesive portion 15 and the absorbent core 16, only one side (the right side as viewed in FIG. 4) is shown enlarged, and the intermediate core portion 21 is further illustrated. The taper shape is exaggerated.

  In addition to the above example, the adhesive portion 15 may have, for example, three or more belt-like adhesive patterns 15n along the vertical direction X, or a single coating pattern applied continuously. It may be configured. Or you may be comprised by the some strip | belt-shaped pattern along the horizontal direction Y, a dot-shaped pattern, etc. FIG.

As shown in FIGS. 4 and 5, the adhesive portion 15 extends in the longitudinal direction X through the front half portion 21 a, each constricted region 21 s and the latter half portion 21 b, and a pair of peripheral portions (peripheral portions) facing the lateral direction Y. 15p is included. The peripheral portion 15p corresponds to the peripheral portion on the outer side in the lateral direction Y of each adhesive pattern 15n.
As will be described below, the peripheral edge portion 15p of the adhesive portion 15 can exert a buffering action against an external force that is received by the napkin 1 and directed inward in the lateral direction Y.

As shown in FIG. 5, the peripheral portion 15p further includes a front adhesive region 15a, a constricted adhesive region 15s, and a rear adhesive region 15b.
The front adhesive region 15a is a region that overlaps the front half portion 21a in the thickness direction Z, and is a region that overlaps the front taper region 24 and the thickness direction Z in FIG.
The constricted adhesive region 15s is a region overlapping the constricted region 21s in the thickness direction Z.
The rear adhesive region 15b is a region overlapping the rear half portion 21b in the thickness direction Z, and is a region overlapping the rear taper region 25 and the thickness direction Z in FIG.

The highly rigid absorbent core 16 is not disposed in the constricted adhesive region 15s. For this reason, the constricted adhesive region 15s is compressed and deformed in the lateral direction Y together with the back sheet 13 and the clothes having low rigidity by an external force directed inward in the lateral direction Y. By the compression deformation, a tensile force (tension) having a component in the longitudinal direction X is generated in the front adhesive region 15a and the rear adhesive region 15b. Since the front adhesive region 15a and the rear adhesive region 15b are not easily deformed due to the presence of the absorbent core 16 having high rigidity, the front adhesive region 15a and the rear adhesive region 15b can exert a resistance against the tension.
In this way, the peripheral edge portion 15p of the adhesive portion 15 exhibits a buffering action against the external force in the lateral direction Y, and the influence of the external force on the absorbent core 16 can be reduced.

[Function and effect of napkin]
The intermediate core portion 21 is configured to be narrower than the front core portion 20 and the rear core portion 22. Thereby, in the napkin 1, the influence of the external force of the horizontal direction Y added by a wearer's both legs can be reduced, and the compression deformation of the intermediate core part 21 can be prevented.

Further, the adhesive portion 15 includes a lateral peripheral edge portion 15p extending in the longitudinal direction X through the front half portion 21a of the intermediate core portion 21, the constricted region 21s, and the rear half portion 21b of the intermediate core portion 21.
As a result, when the constricted adhesive region 15s below the constricted region 21s is compressed and deformed in the lateral direction Y by an external force in the lateral direction Y, the adhesive under the front adhesive region 15a and the latter half portion 21b under the front half portion 21a, which are difficult to deform regions. The region 15b exerts a resistance against the compression deformation.
Therefore, the influence of the external force is alleviated by the deformation of the constricted adhesive region 15s, and the compression deformation of the intermediate core portion 21 at the time of wearing can be effectively suppressed. Thereby, generation | occurrence | production of the clearance gap between a wearer and the intermediate core part 21 can be suppressed, and the fitting property of the napkin 1 can be improved. Furthermore, it is possible to suppress the leakage of excreted liquid accompanying the generation of the gap and the uncomfortable feeling during wearing.

Further, in the intermediate core portion 21, the first half portion 21 a and the second half portion 21 b which are equally divided in the longitudinal direction X have a larger area in the plan view than the first half portion 21 a.
For this reason, the back adhesion area | region 15b which overlaps with the latter half part 21b has a larger area in planar view than the front adhesion area | region 15a which overlaps with the front half part 21a. As a result, a sufficiently difficult deformation region (rear adhesive region 15b) is arranged between the constricted adhesive region 15s, which is a variable region, and the rear core portion 22, and the tension resulting from the deformation of the constricted adhesive region 15s is rearward. Propagation to the core portion 22 can be prevented. Therefore, the compressive deformation of the rear core portion 22 can also be effectively suppressed.

In addition, the intermediate core portion 21 has a front taper region 24 in which the width dimension gradually increases toward the front core portion 20 and a width dimension gradually increases in the direction toward the rear core portion 22. And a rear taper region 25 in which the amount of increase in the width dimension is small.
By the said structure, the front taper area | region 24 can be made into the shape fitted to the groin part which a width | variety spreads rapidly toward the front (upper) from a narrow excretion area | region in a wearer. Therefore, the influence of the external force from the front of the thigh can be prevented from propagating to the front core portion 20. Thereby, the fitting property in front of the napkin 1 can be improved and the generation | occurrence | production of a clearance gap can be prevented.
Moreover, the back taper area | region 25 can be made into the shape fitted to the collar part which width | variety spreads gradually from an excretion area | region. Further, the rear adhesive region 15b of the peripheral edge portion 15p that overlaps the rear tapered region 25 can be configured with a larger area than the front adhesive region 15a of the peripheral edge portion 15p that overlaps the front tapered region 24. Thereby, the non-deformability of the back adhesion area | region 15b can be improved, and it can suppress effectively that the deformation | transformation of the constriction adhesion area | region 15s propagates to the back core part 22. FIG. Therefore, the fitting property in the back of the napkin 1 can also be improved.

  For example, the rear taper region 25 may have a larger length dimension along the vertical direction X than the front taper region 24. Thereby, even if it is a case where the width | variety of the front core part 20 and the back core part 22 is comprised substantially the same, the back taper area | region 25 can be comprised in a gentle taper shape rather than the front taper area | region 24. FIG.

  Further, the constricted adhesive region 15s is also configured to be asymmetrical in the front-rear direction, so that when an external force in the lateral direction Y is applied, the deformation of the constricted adhesive region 15s is guided to a shape along the body shape that is asymmetrical in the front-rear direction of the wearer. be able to. Therefore, the fitting property and wearing feeling of the napkin 1 can be improved.

[Other configuration examples of intermediate core]
The shape of the intermediate core part 21 can take various shapes as shown in FIGS.
For example, as shown in FIG. 6, a convex portion 21 c that protrudes toward the constricted region 21 s may be formed in the rear half portion 21 b of the intermediate core portion 21. FIG. 6 shows an example in which both the rear taper region 25 and the convex portion 21c are formed in the rear half portion 21b. As shown in FIG. 6, a plurality of convex portions 21c may be formed, or a single convex portion 21c may be formed.
The convex portion 21c can increase the area of the rear half 21b, and the area of the rear half 21b in plan view can be made larger than that of the front half 21a. Therefore, the compressive deformation of the rear core portion 22 can be effectively suppressed.

As shown in FIG. 7, the intermediate core portion 21 is configured by a front taper region 24 and a rear taper region 25, and does not have to have the narrow region 23 having a constant width dimension.
In this case, the boundary between the front taper region 24 and the rear taper region 25 may be formed in the front half portion 21a. For example, the rear taper region 25 is formed over the entire length of the rear half portion 21b from the front half portion 21a. Also good. Also by this, the front half part 21a and the rear half part 21b can be configured asymmetrically, and the area of the rear half part 21b in plan view can be configured to be larger than that of the front half part 21a. Therefore, the compressive deformation of the rear core portion 22 can be effectively suppressed.

As shown in FIG. 8, the outer edges of the front taper region 24 and the rear taper region 25 may be configured by curves, and the outer edge of the front taper region 24 may have a larger radius of curvature than the outer edge of the rear taper region 25. Thus, the outer edge of the rear taper region 25 can be configured with a steeper curve than the outer edge of the front taper region 24, and the rear taper region 25 has a configuration in which the amount of increase in the width per unit length is smaller than that of the front taper region 24. can do. Further, the length dimension of the rear taper region 25 can be made larger than that of the front taper region 24.
With this configuration, the front taper region 24 has a shape that is more suitable for the shape corresponding to the groin portion, and the rear taper region 25 has a shape that is more suitable for the shape that gradually increases the width along the shape of the heel portion. .
In addition, when the curvature radius of the outer edge of each of the front taper area | region 24 and the back taper area | region 25 differs for every part, let the average value of the curvature radius of each outer edge be the value of the curvature radius of each area | region.

Alternatively, as shown in FIG. 9, the curved shape of the outer edge of the rear taper region 25 is not limited to an inwardly convex shape, and may be an outwardly convex shape. That is, the rear taper region 25 may be configured as a convex portion 21c that protrudes toward the constricted region 21s formed in the rear half portion 21b. Thereby, the area of the back adhesion area | region 15b can be increased, and the deformation | transformation prevention effect of the back core part 22 can be heightened.
Moreover, as shown in FIG. 10, the shape of the convex part 21c is not limited, The convex part 21c may protrude toward the vertical direction X front.

[Basis weight distribution of absorbent core]
The absorptive core 16 can adjust the basic weight for every area | region from viewpoints, such as an absorptivity and fit property. Basis weight may be synonymous with thickness in a region excluding the compressed groove E, and has a positive correlation with rigidity. From this, the deformation of the absorbent core 16 when an external force is applied can also be controlled by the basis weight distribution of the absorbent core 16.

For example, as shown in FIG. 11, the rear tapered region 25 may have a larger basis weight and a larger thickness dimension in the thickness direction Z than the front tapered region 24. Thereby, the front taper area | region 24 becomes easy to deform | transform rather than the back taper area | region 25, and becomes a structure which can be easily bent toward a wearer's upper direction (abdominal side), and the back taper area | region 25 is suppressed from a deformation | transformation. It becomes the structure which can bend | curve gently toward a person's buttocks. That is, it is possible to impart appropriate deformability to the front taper region 24 and the rear taper region 25 and to enhance the fit of the napkin 1.
Further, by increasing the basis weight of the rear taper region 25, the compressive deformation of the rear taper region 25 when an external force in the lateral direction Y is applied is suppressed, and the propagation of the deformation to the rear core portion 22 is effectively performed. Can be prevented.

The intermediate core portion 21 may include a high basis weight portion 26 that has a higher basis weight and is thicker than other regions. In FIG. 4, the high basis weight portion 26 is indicated by a dot pattern. The configuration of the high basis weight portion 26 will be described later.
Moreover, the relationship of the basic weight (thickness dimension) of each part is not limited to the example shown in FIG. For example, the front core portion 20 may have a smaller basis weight than the front tapered region 24 or may have a larger basis weight. Similarly, the rear core portion 22 may have a smaller basis weight than the rear tapered region 25 or may have a larger basis weight.

[Configuration of boundary groove]
As shown in FIG. 3, the absorbent core 16 further includes a boundary groove portion 27 that extends in the lateral direction Y and is formed in a boundary portion 21 d between the intermediate core portion 21 and the rear core portion 22.
The boundary portion 21d refers to a region on the rear side of the latter half portion 21b of the intermediate core portion 21 that is further divided into two in the vertical direction X. In FIG. 3, the boundary groove 27 is formed between the narrow region 23 and the rear taper region 25.

  A groove that sinks downward from the upper surface in the thickness direction Z of the absorbent core 16 is formed in the boundary groove portion 27, and has a basis weight lower than that of the periphery. Since the basis weight and the thickness have a correlation, the thickness of the bottom portion of the boundary groove portion 27 is configured to be relatively thin as compared with the periphery of the boundary groove portion 27. In FIG. 11, the grooves are not shown.

The boundary groove portion 27 is formed over the entire length in the lateral direction Y of the intermediate core portion 21. However, the boundary groove portion 27 may be formed in a part of the intermediate core portion 21 in the lateral direction Y.
Further, the width and depth (thickness of the bottom portion) of the boundary groove portion 27 can be appropriately set so as to obtain the effects described later.

  By the boundary groove portion 27, the boundary portion 21d is formed thin with a low basis weight. For this reason, when a deformation | transformation arises in the intermediate core part 21, it can prevent that the tension | tensile_strength resulting from the said deformation | transformation propagates to the back core part 22 with the boundary groove part 27. FIG. Therefore, it is possible to more reliably suppress the compressive deformation and twisting of the rear core portion 22 that is likely to occur at bedtime and the like, and to further improve the fit property of the napkin 1 at the rear.

Furthermore, the absorptive core 16 may further have a boundary groove portion 28 extending in the lateral direction Y formed in a boundary portion 21e between the intermediate core portion 21 and the front core portion 20.
The boundary portion 21e is a region on the front side of the front half portion 21a of the intermediate core portion 21 that is further divided into two in the vertical direction X. In the example shown in FIG. 3, the boundary groove 28 is located at the boundary between the narrow region 23 and the front taper region 24. By the boundary groove part 28, the deformation | transformation of the front core part 20 can be suppressed more reliably, and the fit property in the front of the napkin 1 can further be improved.

Furthermore, as shown in FIG. 3, the absorbent core 16 may have a groove portion with a low basis weight in addition to the boundary groove portions 27 and 28.
The absorbent core 16 further includes a longitudinal groove portion 29, a lateral groove portion 30, and an annular groove portion 31. The vertical groove portion 29, the horizontal groove portion 30, and the annular groove portion 31 include grooves that sink downward from the upper surface in the thickness direction Z of the absorbent core 16. The front core part 20, the intermediate core part 21, and the rear core part 22 are each divided by these grooves. By providing the longitudinal groove part 29, the transverse groove part 30, and the annular groove part 31 that are easily deformed with a low basis weight, the flexibility of the absorbent core 16 can be enhanced.
The configuration of the vertical groove portion 29, the horizontal groove portion 30, and the annular groove portion 31 will be described later.

[Configuration of core wrap sheet]
As shown in FIGS. 2 and 12, the absorbent body 11 has a core wrap sheet 17 in addition to the absorbent core 16. The core wrap sheet 17 is wound in the lateral direction Y of the absorbent core 16 so as to cover the front and back of the absorbent core 16. By providing the core wrap sheet 17, it is possible to protect the structure of the absorbent core 16 at the time of distribution and wearing, and also has an effect of enhancing the buffering action against the above-described external force. Details will be described below.

  The core wrap sheet 17 is formed of paper, nonwoven fabric, or the like as described above. That is, the core wrap sheet 17 is made of a sheet material having sufficiently lower rigidity than the absorbent core 16. The core wrap sheet 17 may be composed of one sheet material or a plurality of sheet materials. The core wrap sheet 17 may be bonded to the top sheet 12 and the back sheet 13 with, for example, an adhesive applied in a predetermined pattern.

The width dimension along the horizontal direction Y of the core wrap sheet 17 is, for example, uniformly configured along the vertical direction X, but is not limited thereto, and is, for example, a width smaller than other regions in the constricted covering portion 36 described later. It may be configured to have dimensions.
The length dimension along the longitudinal direction X of the core wrap sheet 17 is formed to be equal to the length dimension (full length) of the absorbent core 16 in the longitudinal direction X, but is not limited thereto, and the full length of the absorbent core 16 is not limited thereto. It may be longer or shorter.

As shown in FIG. 12, the core wrap sheet 17 includes a core covering portions 33, 34, and 35 that cover each portion of the absorbent core 16 and a pair of constricted covering portions that cover a pair of constricted regions 21 s of the absorbent core 16. 36.
The core covering portion includes a front core covering portion 33 that covers the front core portion 20, an intermediate core covering portion 34 that covers the intermediate core portion 21, and a rear core covering portion 35 that covers the rear core portion 22. The intermediate core covering portion 34 further includes a front half covering portion 34a that covers the front half portion 21a and a rear half covering portion 34b that covers the rear half portion 21b. In FIG. 12, the outline of the absorbent core 16 is indicated by a broken line, and the boundary between each of the core covering portions 33 to 35, 34 a, 34 b and the constricted covering portion 36 is indicated by a one-dot chain line.
Since the core wrap sheet 17 is made of a sheet material having sufficiently lower rigidity than the absorbent core 16, the core wrap sheet 17 covers the absorbent core 16 with a shape corresponding to the shape of the absorbent core 16.

  On the other hand, the constricted covering portion 36 extends in the longitudinal direction X from the front core covering portion 33 and extends so as to reach the rear core covering portion 35. For this reason, the constricted covering portion 36 is maintained in a state in which a constant tension is applied in the longitudinal direction X by the front core covering portion 33 and the rear core covering portion 35.

  When receiving the external force from the lateral direction Y, the constricted covering portion 36 generates a predetermined tension in the longitudinal direction X, and this acts as a resistance against the external force from the lateral direction Y. That is, in the napkin 1, in addition to the back surface sheet 13 and the garment exhibiting a buffering action against an external force by the constricted adhesive region 15s, the constricted covering portion 36 can also exhibit a similar buffering action. As a result, the buffer effect with respect to external force increases, the compressive deformation of the absorptive core 16 can be prevented effectively, and the fit of the napkin 1 can be further enhanced.

The constricted covering portion 36 may be joined to the top sheet 12 and the back sheet 13 by an adhesive, a heat seal, or the like. Thereby, when external force is added to the constriction area | region 21s, the back surface sheet 13, the core wrap sheet | seat 17, and the surface sheet 12 in which the adhesion part 15 was provided deform | transform integrally, and can exhibit a buffering effect. Therefore, the compressive deformation of the absorbent core 16 can be more effectively prevented.
Note that not only the constricted covering portion 36 but also other regions of the core wrap sheet 17 may be bonded to the top sheet 12 and the back sheet 13, or the entire surface of the core wrap sheet 17 may be bonded.

[Configuration of surface sheet]
As described above, the top sheet 12 is joined to the constricted covering portion 36 and can exert a buffering action against an external force together with the core wrap sheet 17 and the back sheet 13. Therefore, from the viewpoint of obtaining a higher buffering effect, the top sheet 12 can be formed as follows.

As shown in FIGS. 13 and 14, the topsheet 12 includes a linear embossed portion 37 that is compressed in the thickness direction Z, and a convex portion 38 that is surrounded by the linear embossed portion 37 and protrudes outward in the thickness direction Z. And having.
Although the linear embossed part 37 and the convex part 38 should just be formed in the area | region joined to the constriction coating | coated part 36, you may be formed in the whole surface sheet 12. FIG.
In addition, the surface sheet 12 is arrange | positioned so that the thickness direction and the thickness direction of the napkin 1 may correspond in the napkin 1. For this reason, below, the thickness direction Z is used synonymously with the thickness direction Z of the surface sheet 12.

The linear embossed portion 37 includes a first linear embossed group 39 and a second linear embossed group 40 that are inclined at acute angles α and β with respect to the lateral direction Y, respectively, and intersect each other. The first linear emboss group 39 and the second linear emboss group 40 include a plurality of linear embosses 39a and 40a that extend in parallel and are arranged at regular intervals.
The angle α with respect to the lateral direction Y of the first linear embossed group 39 is greater than 0 degree and less than 90 degrees, and more preferably 20 degrees or greater and 70 degrees or less. Similarly, the angle β of the second linear embossed group 40 with respect to the lateral direction Y is greater than 0 degree and less than 90 degrees, and more preferably 20 degrees or greater and 70 degrees or less. Further, the angle at which the linear embosses 39a, 40a of the first linear emboss group 39 and the second linear emboss group 40 intersect may be an acute angle (obtuse angle) or 90 degrees, and is not limited.

  The top sheet 12 is formed, for example, by embossing a nonwoven web made of predetermined fibers. The embossing is performed using, for example, an embossing roll in which convex portions for forming embossing of a lattice pattern are formed on the peripheral surface, and a flat roll having a smooth peripheral surface and disposed to face the embossing roll. be able to.

  As the fibers constituting the topsheet 12, a core-sheath type thermoadhesive conjugate fiber can be preferably used. The heat-adhesive conjugate fiber is, for example, a fiber whose sheath is made of polyethylene resin (PE) and whose core is made of polypropylene resin (PP), whose sheath is polyethylene resin (PE), and whose core is polyethylene terephthalate resin (PET). Or the like. However, the fiber which comprises the surface sheet 12 is not limited to these.

  The convex portion 38 is formed by two linear embossings 39a in the first linear embossed group 39 and two linear embossed elements 40a in the second linear embossed group 40 in plan view. It is formed in a rectangular area. In addition, the surface sheet 12 should just have the convex part 38 formed in only one surface, and the other surface may be flat or more undulating.

  As shown in FIG. 15, the convex part 38 is comprised as a solid convex fiber assembly. The surface of the convex portion 38 is macroscopically configured as a curved surface, but microscopically, irregularities due to fibers may be formed, and the shape of each convex portion 38 may not be the same. The structure of the convex part 38 is not limited to the example of FIG. 15, It may be hollow and can take various shapes, such as a prism shape and a truncated pyramid shape.

  Since the linear embossed portion 37 is compressed in the thickness direction Z, it has a higher density and higher rigidity than the convex portion 38. That is, when the topsheet 12 receives an external force parallel to the lateral direction Y of the napkin 1, the linear embossed portion 37 becomes a starting point of deformation, and the convex portion 38 between the linear embossed portions 37 rises in the thickness direction Z. Deform. Thereby, the energy of the external force in the lateral direction Y is consumed by the deformation of the topsheet 12. Therefore, the top sheet 12 can exert a buffering action together with the back sheet 13 (and the core wrap sheet 17) on the constricted region 21s.

  Further, in the linear embossed portion 37, each linear emboss 39a, 40a has an acute angle with respect to the lateral direction Y. For this reason, of the external force in the lateral direction Y, the component force in the emboss width direction of the linear embosses 39 a and 40 a contributes to the deformation of the convex portion 38. That is, with this configuration, the energy of external force that contributes to the deformation of the convex portion 38 can be reduced. Furthermore, since each linear embossing 39a and 40a cross | intersect each other, the component force of the extension direction of one linear embossing 39a and 40a is supported by the other linear embossing 39a and 40a. Thereby, the external force added to the constriction area | region 21s by the surface sheet 12 can be relieve | moderated, and the compressive deformation of the absorptive core 16 can be suppressed more effectively.

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

(Width of each part of absorbent core)
The width dimensions D1 and D3 of the front core part 20 and the rear core part 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 dimension D2 of the narrowest portion (for example, the narrow region 23) of the intermediate core portion 21 is preferably 40 mm or greater and 75 mm or less, and more preferably 50 mm or greater and 70 mm or less.

(Configuration of high basis weight part)
The high basis weight part 26 has a higher basis weight than other regions, and protrudes upward in the thickness direction Z as shown in FIGS. 3 and 11. In the present embodiment, the high basis weight portion 26 extends over the entire length in the longitudinal direction X of the narrow region 23 of the intermediate core portion 21. However, the high basis weight portion 26 may be shorter than the length of the narrow region 23 in the vertical direction X. Further, the high basis weight portion 26 may be longer than the length of the narrow region 23 in the longitudinal direction X, and may further extend to at least one of the front core portion 20 and the rear core portion 22.
By providing the high basis weight portion 26 so as to face the excretion region of the wearer during wearing, the rigidity of the portion facing the excretion region can be increased. Thereby, the high basic weight part 26 becomes difficult to deform | transform with respect to the external force of the horizontal direction Y added at the time of wear. Therefore, in the napkin 1, the fitting property with respect to the wearer's excretion region can be enhanced, and the leakage of the liquid in the longitudinal direction X can be prevented. In addition, it replaces with the form of FIG. 11, and it is good also as a form in which the high basic weight part 26 protrudes below the thickness direction Z. FIG.

(Basis weight of absorbent core)
The basis weight of the absorbent core 16 excluding the boundary groove portions 27 and 28, the vertical groove portion 29, the horizontal groove portion 30, and the annular groove portion 31 is preferably 100 g / m ² or more and 1000 g / m ² or less, more preferably 150 g / m ^2. It is 900 g / m ² or more.
The basis weight of the high basis weight portion 26 preferably being 400 g / ^{m 2} or more 1000 g / ^{m 2} or less, more preferably 500 g / ^{m 2} or more 900 g / ^{m 2} or less.

(Measurement method of the basis weight of the absorbent core)
The measurement object area | region of the absorptive core 16 is cut | disconnected using the feather blade made from a feather company, and a small piece is obtained so that it may become a predetermined area. The weights of these pieces are measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point). The basis weight of the small piece is calculated by dividing the obtained weight by the area of the small piece of each part. About each of each part, let the average of the basic weight of five small pieces be a basic weight.

(Configuration of vertical groove, horizontal groove and annular groove)
The vertical groove portions 29 extend along the vertical direction X, and are arranged at intervals along the horizontal direction Y. The vertical groove portion 29 is formed in each of the front core portion 20, the intermediate core portion 21, and the rear core portion 22 over the entire length in the vertical direction X.
The lateral groove portions 30 extend along the lateral direction Y and are arranged at intervals along the longitudinal direction X. The lateral groove portion 30 is formed over the entire length in the lateral direction Y in each of the front core portion 20, the intermediate core portion 21, and the rear core portion 22.
In addition to increasing the flexibility of the absorbent core 16 by providing the vertical groove portion 29 and the horizontal groove portion 30, the liquid absorption rate of the absorbent core 16 is increased by drawing liquid into the vertical groove portion 29 and the horizontal groove portion 30. be able to.

  The annular groove portion 31 is formed along the outer edge of the high basis weight portion 26. By providing the annular groove portion 31 that is easily deformed at a low basis weight, deformation around the high basis weight portion 26 is absorbed by the annular groove portion 31, so that the high basis weight portion 26 is not easily affected by the surrounding deformation.

  The configuration of the vertical groove portion 29, the horizontal groove portion 30, and the annular groove portion 31 is not limited to the configuration described in FIG. 3, and is appropriately set based on the shape of the absorbent core 16, the required function, and the like. Can be done. Further, in the napkin 1, the absorbent core 16 may not include at least one of the longitudinal groove portion 29, the lateral groove portion 30, and the annular groove portion 31.

  The “low basis weight” of each of the groove portions 27 to 31 including the boundary groove portions 27 and 28 is a concept including a form in which the material of the absorbent core 16 is present as well as a form in which the material of the absorbent core 16 is not present. is there. In the form in which the material of the absorbent core 16 is present in each of the groove portions 27 to 31, the block-shaped portions of the absorbent core 16 located on both sides thereof are connected via the respective groove portions 27 to 31. However, it is more preferable because it is difficult to cause twist, breakage, tearing, etc. due to movement and can impart flexibility.

  The widths of the vertical groove portion 29, the horizontal groove portion 30, and the annular groove portion 31 are preferably 0.5 mm or more and 10 mm or less, and more preferably 1 mm or more and 5 mm or less. The depth of the annular groove part 31 is 0.5 mm or more and 10 mm or less, for example, and the depth of the vertical groove part 29 and the horizontal groove part 30 is 0.5 mm or more and 10 mm or less, for example.

  In the intermediate core portion 21, the vertical groove portion 29 may be wider than the annular groove portion 31. In that case, the absorbent core 16 is easily deformed along the excretion region during wearing, and the excreted liquid is easily diffused along the vertical direction X. The longitudinal groove 29 is preferably larger than the annular groove 31 by 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less.

It is preferable that the basic weight of the nonwoven fabric which comprises the surface sheet 12 is 10-80 g / m < ² >, especially 15-60 g / m < ² >.
It is preferable that the thickness dimension in the convex part 38 of the surface sheet 12 is 0.5-3 mm, especially 0.7-3 mm in a dry state.

  The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  In the above embodiment, although the example of the sanitary napkin was shown as a pad-shaped absorbent article, it is not limited to this. The absorbent article of the present invention may be, for example, a urine collecting pad or a cage sheet.

1 ... Napkin (pad-like absorbent article)
DESCRIPTION OF SYMBOLS 11 ... Absorber 12 ... Top sheet 13 ... Back sheet 15 ... Adhesive part 15p ... Lateral peripheral part 16 ... Absorbent core 20 ... Front core part 21 ... Middle core part 21a ... First half part 21b ... Second half part 21s ... Constriction area | region 22 ... Back core

Claims (11)

A liquid-permeable top sheet, a back sheet, an absorbent body having an absorbent core and disposed between the top sheet and the back sheet, and an adhesive portion provided on the outer surface of the back sheet, and worn A pad-like absorbent article having a longitudinal direction corresponding to the front-rear direction of the person and a transverse direction perpendicular to the longitudinal direction,
The absorbent core is
A front core portion and a rear core portion; an intermediate core portion positioned between the front core portion and the rear core portion and formed narrower than the front core portion and the rear core portion by a pair of constricted regions; Have
The intermediate core part is configured such that the first half part and the second half part divided by a straight line that bisects in the longitudinal direction are asymmetric with respect to the straight line,
The adhesive part includes a pair of lateral peripheral edges extending in the longitudinal direction through the front half part, each of the pair of constricted regions, and the latter half part. The pad-like absorbent article according to claim 1, wherein in the intermediate core portion, the latter half portion has a larger area in plan view than the front half portion. The intermediate core part is
A front taper region whose width dimension gradually increases toward the front core portion;
The pad-shaped absorbent article according to claim 2, further comprising: a rear taper region having a width dimension gradually increasing toward the rear core portion and a smaller amount of increase in the width dimension per unit length than the front taper region. The pad-like absorbent article according to claim 3, wherein the rear taper region has a length dimension that is greater in the longitudinal direction than the front taper region. The outer edges of the front taper region and the rear taper region are configured by curves,
The pad-like absorbent article according to claim 3 or 4, wherein an outer edge of the front taper region has a larger radius of curvature than an outer edge of the rear taper region. The pad-like absorbent article according to any one of claims 3 to 5, wherein the rear taper region has a larger basis weight than the front taper region. The pad-shaped absorbent article according to any one of claims 2 to 6, wherein the intermediate core portion includes a convex portion that is formed in the latter half portion and protrudes in a convex shape toward the constricted region. The pad-like absorbent article according to any one of claims 1 to 7, wherein the absorbent core further includes a boundary groove portion that is formed at a boundary portion between the intermediate core portion and the rear core portion and extends in the lateral direction. . The absorbent body further includes a core wrap sheet that covers the absorbent core;
The pad shape according to any one of claims 1 to 8, wherein the core wrap sheet includes a core covering portion that covers the absorbent core and a pair of constricted covering portions that cover the pair of constricted regions. Absorbent article. The pad-like absorbent article according to claim 9, wherein the pair of constricted covering portions are joined to the top sheet and the back sheet. The topsheet is formed in at least a region on the pair of constricted covering portions, and is a linear embossed portion compressed in the thickness direction, and a protrusion that is surrounded by the linear embossed portion and protrudes outward in the thickness direction. And
The pad-like absorbent article according to claim 10, wherein the linear embossed portion includes a first linear embossed group and a second linear embossed group that are inclined in the lateral direction and intersect each other.

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