JP6578342B2 - Sanitary napkin - Google Patents

Description

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

  When the sanitary napkin is used in the sleeping posture, the liquid is likely to leak to the rear portion or the like through a gap formed between the wearer and the wearer. For this reason, in absorbent articles, such as a sanitary napkin, in order to improve the fitting property with respect to a wearer, the technique which provides the absorptive core which has a protrusion part in the width direction center area is known (refer patent document 1).

JP 2014-104093 A

In general, the width of a person's crotch can be narrower than the width of a sanitary napkin. For this reason, the force which goes to the inner side of the width direction is added to the intermediate part of the sanitary napkin which opposes a wearer's excretion area | region, and the deformation | transformation compressed to the width direction tends to produce. Furthermore, along with such compression deformation, the front part located in front of the intermediate part and the rear part located behind are also likely to be deformed.
When such deformation occurs in the front part and the rear part of the sanitary napkin, a gap is formed between the sanitary napkin and a liquid material such as menstrual blood excreted from the excretion area of the wearer flows forward and backward. Cheap. For this reason, liquid leakage may occur in the front part and the rear part.

  The subject of this invention is related with the absorbent article which can prevent the liquid leakage in a front part and a back part.

The absorbent article which concerns on one form of this invention comprises an absorptive core.
The absorbent core is positioned between the front core portion and the rear core portion facing each other in the longitudinal direction, and is narrower than the front core portion and the rear core portion, located between the front core portion and the rear core portion. And an intermediate core portion.
The intermediate core portion has a higher basis weight than the front core portion and the rear core portion, a high basis weight portion formed in the center in the width direction, and a lower basis weight than the front core portion and the rear core portion. And a low basis weight part formed around the high basis weight part.

  As described above, according to the absorbent article of the present invention, it is possible to prevent liquid leakage at the front part and the rear part.

It is a perspective view showing an absorptive article of a 1st embodiment of the present invention. It is a top view of the absorptive article. It is sectional drawing cut | disconnected by the III-III line of FIG. It is a top view which shows the absorptive core of the said absorbent article. It is a typical side view which shows the said absorptive core. It is a top view which shows typically the structural example of the longitudinal direction edge part of the high basic weight part of the said absorptive core. It is an enlarged plan view which shows the taper part of the said absorptive core. It is a top view which shows the structure of the pressing groove part formed in the said absorptive core. It is a top view which shows typically the absorptive core of the absorbent article which concerns on other embodiment of this invention. It is a top view which shows typically the absorptive core of the absorbent article which concerns on other embodiment of this invention.

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

<First Embodiment>
[Overall structure of napkin]
FIG. 1 is a perspective view showing an absorbent article 1 according to an embodiment of the present invention. In FIG. 1, the X-axis direction corresponds to the front-rear direction, the Y-axis direction corresponds to the left-right direction, and the Z-axis direction corresponds to the up-down direction.
FIG. 2 is a plan view of the absorbent article 1 and shows an aspect in which the absorbent article 1 shown in FIG. 1 is extended along the XY plane. In the absorbent article 1 shown in FIG. 2, the X-axis direction corresponds to the longitudinal direction, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the thickness direction. Hereinafter, the absorbent article 1 is demonstrated in the aspect shown in FIG.
The absorbent article 1 of this embodiment is configured as a sanitary napkin, and is hereinafter referred to as a napkin 1.
The napkin 1 of this embodiment may be used at the time of sleeping, for example, may have a length of 30 cm or more along the longitudinal direction.

  In this embodiment, the napkin 1 includes a main body M, a pair of wing portions W, a pair of side guards G, and a pair of rear flap portions F.

The main body M extends in the longitudinal direction, and is fixed to the inner surface (surface to be mounted) of the wearer's underwear when worn. The main body M has an absorber 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 main body M has a front region M1, an intermediate region M2, and a rear region M3, which are divided along the longitudinal direction.
The front area M1 is an area arranged in front of the middle area M2 (on the abdomen side of the wearer), and is configured to face the front of the excretion area of the wearer when worn.
The intermediate area M2 is configured to face the excretion area of the wearer when worn. Note that the intermediate region M2 may be positioned closer to the front of the main body M as illustrated, or may be positioned in the center of the main body M.
The rear area M3 is an area arranged behind the intermediate area M2 (back side of the wearer), and is configured to face the rear of the excretion area of the wearer when worn.

The wing portion W is configured to protrude greatly from the intermediate region M2 to the outside in the width direction. In other words, the intermediate region M2 exists in a range where the wing portion W exists in the longitudinal direction.
The side guard G is disposed so as to extend in the longitudinal direction at the peripheral edge in the width direction of the main body M including the intermediate region M2.
The rear flap portion F is configured to bulge outward from the rear region M3 in the width direction.
The napkin 1 may not have at least one of the wing part W, the side guard G, and the rear flap part F.

[Configuration of each part of the napkin]
3 is a cross-sectional view taken along line III-III in FIG.
The napkin 1 includes an absorbent body 11, a top sheet 12, a back sheet 13, a pair of side sheets 14, an adhesive part 15, and a pressing groove part 16. In the main body M, the napkin 1 has a configuration in which a back sheet 13, an absorbent body 11, and a top sheet 12 are laminated.

The absorbent body 11 has a longitudinal direction in the X-axis direction, and is disposed at the center in the thickness direction of the napkin 1. 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 20 and a core wrap sheet 30.
The absorbent core 20 has a function of absorbing and holding the liquid. The absorbent core 20 may be formed of, for example, a fiber assembly made of hydrophilic fibers such as pulp fibers, or may have a configuration in which a water absorbent polymer is held in the fiber assembly. . The detailed configuration of the absorbent core 20 will be described later.
The core wrap sheet 30 covers the absorbent core 20 and has, for example, a function of maintaining the shape of the absorbent core 20. The core wrap sheet 30 is formed of, for example, thin and soft paper such as tissue paper, liquid permeable nonwoven fabric, or the like.

  The top sheet 12 is configured as a liquid-permeable sheet material and is disposed on the absorber 11. The top sheet 12 forms an outer surface of the main body M that is above the napkin 1 in the thickness direction.

  The back sheet 13 is disposed to face the top sheet 12 in the thickness direction with the absorber 11 interposed therebetween. The back sheet 13 forms an outer surface below the napkin 1 in the thickness direction. The back sheet 13 is joined to the top sheet 12 and the side sheet 14 by an adhesive, a heat seal, etc., for example in a peripheral part.

  The pair of side sheets 14 are opposed to each other in the width direction with the top sheet 12 interposed therebetween, and are disposed on the periphery in the width direction of the napkin 1. The side guard G includes an elastic member 143 such as a thread-like elastic member disposed along the longitudinal direction between the folded portion 141 of the side sheet 14 folded outward in the width direction and the surface sheet joining portion 142. It is configured to be able to stand on the skin side. The side sheet 14 is bonded to the main surface 12 a using the adhesive B at the surface sheet bonding portion 142 that is a base portion of the side guard G.

  The adhesive portion 15 is a configuration for fixing the napkin 1 to the underwear, and is formed on the outer surface of the back sheet 13. The adhesion part 15 has the main body adhesion part 151 provided in the main body M, the wing adhesion part 152 provided in the wing part W, and the back flap adhesion part (not shown) provided in the back flap part F, for example. .

A pair of pressing groove part 16 is comprised as a linear groove formed by pressing the absorber 11 and the surface sheet 12. As shown in FIG. A pair of pressing groove part 16 is formed in the surface sheet 12, the core wrap sheet | seat 30, and the absorptive core 20, is extended in a longitudinal direction and mutually opposes in the width direction.
The pair of compressed groove portions 16 may be connected to each other at the front end portion and the rear end portion so as to go around the main body M. The detailed configuration of the compressed groove portion 16 will be described later.

[Planar shape of absorbent core]
FIG. 4 is a plan view showing the absorbent core 20.
The absorbent core 20 includes a front core portion 21 and a rear core portion 23 that face each other in the longitudinal direction, and an intermediate core portion 22 that is positioned between the front core portion 21 and the rear core portion 23. The front core portion 21 is located in the front region M1, the intermediate core portion 22 is located in the intermediate region M2, and the rear core portion 23 is located in the rear region M3. The absorptive core 20 has a plane shape that is symmetrical in the width direction.

FIG. 4 shows widths D1, D2, and D3, which are dimensions in the width direction of the front core portion 21, the intermediate core portion 22, and the rear core portion 23. The intermediate core portion 22 has a width D2 that is narrower than the widths D1 and D3 of the front core portion 21 and the rear core portion 23. That is, the absorbent core 20 has a planar shape constricted in the width direction at the intermediate core portion 22.
Since the absorbent core 20 has the narrow intermediate core portion 22, when the wearer's legs are closed and the crotch width becomes narrow, the external force applied to the intermediate core portion 22 in the width direction is reduced. Can do.

The widths D1 and D3 of the front core portion 21 and the rear core portion 23 are preferably 60 mm or more and 100 mm or less, and more preferably 70 mm or more and 90 mm or less.
The width D2 of the intermediate core portion 22 is preferably 40 mm or greater and 75 mm or less, and more preferably 50 mm or greater and 70 mm or less. This makes it less susceptible to external forces applied inward in the width direction added by the wearer's legs, etc., and can also handle mounting position shifts in the width direction, giving the wearer a sense of security. it can.

  The length of the intermediate core portion 22 in the longitudinal direction is preferably 60 mm or more and 170 mm or less, and more preferably 80 mm or more and 160 mm or less. Thereby, even when there is a displacement in the longitudinal direction, the intermediate core portion 22 can be opposed to the wearer's excretion region.

  In the present embodiment, the width D1 of the front core portion 21 and the width D3 of the rear core portion 23 are the same. However, the width D1 of the front core portion 21 and the width D3 of the rear core portion 23 may be different. Moreover, the width | variety of each of the front core part 21, the intermediate | middle core part 22, and the back core part 23 does not need to be uniform. In this case, the maximum dimension in the width direction of the front core part 21 and the rear core part 23 can be set to the widths D1 and D3, and the minimum dimension in the width direction of the intermediate core part 22 can be set to D2.

  In addition, in this embodiment, the front core part 21, the intermediate core part 22, and the back core part 23 are divided | segmented into the block shape by the vertical groove part 27, the horizontal groove part 28, and the peripheral groove part 29 of low basic weight. In the following description, the basis weight of the front core portion 21, the intermediate core portion 22, and the rear core portion 23 refers to the basis weight of the block portion excluding the groove portions 27, 28, and 29. The configuration of the vertical groove portion 27, the horizontal groove portion 28, and the peripheral groove portion 29 will be described later.

[Basis weight distribution of absorbent core]
FIG. 5 is a schematic side view of the absorbent core 20.
The intermediate core portion 22 includes a high basis weight portion 24 and a low basis weight portion 25. In FIG. 4, the high basis weight portion 24 is indicated by a high-density dot pattern, and the low basis weight portion 25 is indicated by a low-density dot pattern.

The high basis weight portion 24 is formed at the center in the width direction of the intermediate core portion 22 and is disposed so as to face the excretion region of the wearer when worn. The high basis weight portion 24 has a front end portion 24a and a rear end portion 24b facing each other in the longitudinal direction, and extends in the longitudinal direction. The width of the intermediate portion in the longitudinal direction of the high basis weight portion 24 is preferably 15 mm or more and 60 mm or less, and more preferably 20 mm or more and 50 mm or less. By making the said width | variety into such a range, the fit property to a wearer's excretion area | region can be improved and sufficient absorption amount can be ensured.
The high basis weight portion 24 has a length that is equal to or less than the length of the intermediate core portion 22 along the longitudinal direction, and has, for example, the same length as the intermediate core portion 22 along the longitudinal direction.
In the following description, “front end 24a and rear end 24b” are also referred to as “longitudinal ends 24a, 24b” or “ends 24a, 24b”.

  The high basis weight portion 24 has a higher basis weight than the front core portion 21 and the rear core portion 23 and the low basis weight portion 25. For this reason, the high basic weight part 24 is configured to protrude upward in the thickness direction from the low basic weight part 25, the front core part 21, and the rear core part 23.

The low basis weight portion 25 has a lower basis weight than the front core portion 21 and the rear core portion 23, and is formed around the high basis weight portion 24. The low basis weight portion 25 is configured to sink downward from the upper surface in the thickness direction of the high basis weight portion 24, the front core portion 21, and the rear core portion 23. Here, the “periphery” means at least a region including the outside in the width direction of the high basis weight portion 24. Moreover, it is preferable that the low basic weight part 25 exists in the intermediate area M2 of the napkin 1 at least.
In this embodiment, the low basis weight portion 25 is arranged separately on the left and right sides on the outer side in the width direction of the high basis weight portion 24.

Thus, in the absorptive core 20, the basic weight becomes high in order of the low basic weight part 25, the front core part 21, the back core part 23, and the high basic weight part 24.
The basis weights of the front core portion 21 and the rear core portion 23 are substantially the same in this embodiment. However, the basis weight of the front core portion 21 and the basis weight of the rear core portion 23 may be different. In this case, the basis weight of the higher one of the front core portion 21 and the rear core portion 23 is lower than the basis weight of the high basis weight portion 24, and the basis weight of the lower one of the front core portion 21 and the rear core portion 23 is low. What is necessary is just to be higher than the basic weight of the basic weight part 25.
Basis weight correlates with rigidity. For this reason, in the absorptive core 20, it is comprised so that rigidity may become high in order of the low basic weight part 25, the front core part 21, the back core part 23, and the high basic weight part 24.

In the present embodiment, the low basis weight portion 25 having the lowest rigidity is disposed on the outer side in the width direction of the intermediate core portion 22. For this reason, when an external force directed inward in the width direction is applied by the wearer's leg or the like, the low basis weight portion 25 is greatly compressed and deformed in the width direction.
On the other hand, tension (tensile force) including a component in the longitudinal direction (X-axis direction) is generated by compressive deformation of the low basis weight portion 25. However, since the low basis weight portion 25 has low rigidity, the front core portion 21 and It is difficult to generate a large tension that deforms the rear core portion 23. That is, the low basis weight portion 25 acts as a buffer region for the external force going inward in the width direction, and can prevent the influence of the external force from propagating to the front core portion 21 and the rear core portion 23. Thereby, in the front core part 21 and the back core part 23, the deformation | transformation resulting from external force that the width | variety of the upper surface of a thickness direction is compressed or an upper surface curves in a concave shape can be prevented.
Therefore, in the front core part 21 and the back core part 23, the inappropriate deformation | transformation which produces a clearance gap with a wearer can be prevented, and the liquid leak to the front and back can be prevented.

  In addition, since the intermediate core portion 22 is configured to be narrow, the magnitude of the external force received by the low basis weight portion 25 can be reduced, and compression deformation of the front core portion 21 and the rear core portion 23 is more reliably performed. Can be prevented.

  In addition, since the external force is buffered by the low basis weight portion 25, it is possible to prevent the deformation of the high basis weight portion 24 located at the center portion in the width direction of the intermediate core portion 22. Therefore, it is possible to prevent a gap from being formed between the excretion region and the high basis weight portion 24, and to prevent liquid leakage in the width direction in addition to the front and rear.

As described above, the front core portion 21 and the rear core portion 23 are not easily affected by the external force directed inward in the width direction by the low basis weight portion 25.
Further, the tension accompanying the compression deformation of the low basis weight portion 25 is particularly likely to act in the vicinity of the boundary portions P1 and P2 between the intermediate core portion 22, and the front core portion 21 and the rear core portion 23. Therefore, in order to further reduce the influence of the tension, each portion arranged in the vicinity of the boundary portions P1 and P2 can be configured as follows.

  In the following description, the boundary portion P1 refers to a portion that does not belong to any of the front core portion 21 and the intermediate core portion 22, and the boundary portion P2 refers to between the rear core portion 23 and the intermediate core portion 22. A part that does not belong to any of the above.

  As shown in FIG. 3, in the intermediate core portion 22, the core wrap sheet 30 extends outward from the widthwise end portion of the absorbent core 20 and has a folded portion. Since the absorbent core 20 does not exist in the portion, the rigidity is lower than the low basis weight portion 25 of the intermediate core portion 22, and can be a buffer region against an external force from the width direction outer side toward the low basis weight portion 25. The effects described above can be further enhanced.

[Configuration of the longitudinal end of the high basis weight section]
As shown in FIG. 4, the longitudinal end portions 24 a and 24 b closest to the boundary portions P <b> 1 and P <b> 2 in the high basis weight portion 24 have a shape in which the width gradually decreases toward the tip. Thereby, in the area | region adjacent to boundary part P1, P2 of the intermediate | middle core part 22, the ratio for which the low basic weight part 25 which acts as a buffer area | region of an external force can be enlarged. Therefore, the external force buffering action by the low basis weight portion 25 can be enhanced, and the deformation of the front core portion 21 and the rear core portion 23 into an inappropriate shape can be effectively prevented.

  The end portions 24a and 24b may have an arc shape or an elliptic arc shape. Thereby, since the width | variety in the front-end | tip of edge part 24a, 24b becomes 0, the ratio for which the low basic weight part 25 accounts in the area | region adjacent to boundary part P1, P2 of the intermediate core part 22 can be made lower, and low. The external force buffering action by the basis weight part 25 can be further enhanced.

The shapes of the end portions 24a and 24b of the high basis weight portion 24 are not limited to the above shapes.
FIG. 6 is a plan view schematically showing a configuration example of the longitudinal end portions 24 a and 24 b of the high basis weight portion 24.
For example, as shown in FIG. 6A, the end portions 24a and 24b may have a triangular shape with a sharp tip. Also by this, the end portions 24a and 24b have a shape in which the width gradually decreases toward the tip, and the width at the tip of the ends 24a and 24b becomes zero. Therefore, the same effect as the end portions 24a and 24b in FIG. 4 can be obtained.

Alternatively, as shown in FIG. 6B, the end portions 24a and 24b may have a trapezoidal shape including a side along the width direction at the tip, or have a rectangular shape with rounded corners as shown in FIG. 6C. You may do it. Also by these, end part 24a, 24b has a shape where a width | variety reduces gradually toward a front-end | tip, and the external force buffering effect by the low basic weight part 25 can be heightened.
As shown in FIG. 6D, the end portions 24a and 24b do not have a shape in which the width gradually decreases toward the tip, and may be configured in a rectangular shape having substantially the same width as a whole.

[Configuration of taper portion of front core portion and rear core portion]
As shown in FIG. 4, the front core portion 21 and the rear core portion 23 include taper portions 21 a and 23 a that are formed adjacent to the boundary portions P <b> 1 and P <b> 2 and gradually decrease in width toward the intermediate core portion 22. The taper portions 21a and 23a have a line-symmetric shape with respect to an axis of symmetry parallel to the width direction.

  A tension having a component in the longitudinal direction (X-axis direction) and the width direction (Y-axis direction) is applied to the vicinity of the boundary portions P1 and P2 as the intermediate core portion 22 is compressed and deformed. By providing the taper portions 21a and 23a, it is possible to eliminate a portion projecting outward in the width direction that is easily affected by the tension in a region adjacent to the boundary portions P1 and P2 of the front core portion 21 and the rear core portion 23. . Therefore, it is possible to prevent a large deformation such as folding of portions adjacent to the boundary portions P1 and P2 of the front core portion 21 and the rear core portion 23 due to the tension.

FIG. 7 is an enlarged plan view showing the tapered portion 21a. In the figure, illustration of a boundary groove portion 26, a vertical groove portion 27, a horizontal groove portion 28 and a peripheral groove portion 29, which will be described later, is omitted. Moreover, since the structure of the taper part 23a is also the same, illustration and description are abbreviate | omitted.
In this embodiment, the outer edge line Lt of the tapered portion 21a (tapered portion 23a) is a straight line extending in the direction of the rotation angle θ with respect to an axis parallel to the longitudinal direction. The rotation angle θ is preferably 20 degrees or greater and 80 degrees or less, and more preferably 30 degrees or greater and 70 degrees or less. Thereby, the difference between the direction of the tension and the direction of the outer edge line can be reduced, and the influence of the tension can be reduced more effectively.

  In addition, the outer edge line of the taper parts 21a and 23a is not limited to a linear shape, and may be a curved shape. The shape of the taper portions 21a and 23a may be an asymmetric shape with respect to an axis of symmetry parallel to the width direction.

[Configuration of boundary groove]
As shown in FIG. 4, the absorbent core 20 further includes a boundary groove portion 26 located between at least one of the front core portion 21 and the rear core portion 23 and the intermediate core portion 22. That is, the boundary groove part 26 is located in the boundary parts P1 and P2. The boundary groove portion 26 can cut off the deformation of the low basis weight portion 25 as will be described later.

  A groove that sinks downward from the upper surface in the thickness direction of the absorbent core 20 is formed in the boundary groove portion 26, and has a basis weight lower than that of the low basis weight portion 25. Since the basis weight and the thickness have a correlation, the region where the boundary groove portion 26 is formed in the absorbent core 20, that is, the bottom portion forming the boundary groove portion 26 is a low basis weight portion where the boundary groove portion 26 is not formed. Compared to 25 etc., the thickness is relatively thin.

The boundary groove portion 26 is formed over the entire length in the width direction of the intermediate core portion 22. Alternatively, the boundary groove portion 26 may be formed in a part in the width direction of the intermediate core portion 22.
Further, the width and depth (thickness of the bottom portion) of the boundary groove portion 26 can be appropriately set so as to obtain the effects described later.

  Due to the boundary groove 26, the boundary portions P1 and P2 are formed thin with a low basis weight. For this reason, when the intermediate core part 22 including the low basis weight part 25 is deformed, the boundary groove part 26 can prevent the tension resulting from the deformation from propagating to the front core part 21 and the rear core part 23. . Therefore, the deformation | transformation of the front core part 21 and the back core part 23 accompanying a deformation | transformation of the low basic weight part 25 can be suppressed, and a back leak and a front leak can be prevented more effectively.

[Configuration of vertical groove portion, horizontal groove portion and peripheral groove portion]
Further, the absorbent core 20 has a low basis weight groove portion in addition to the boundary groove portion 26.
As shown in FIG. 4, the absorbent core 20 further includes a longitudinal groove portion 27, a lateral groove portion 28, and a peripheral groove portion 29. In the longitudinal groove portion 27, the lateral groove portion 28, and the peripheral groove portion 29, grooves that sink downward from the upper surface in the thickness direction of the absorbent core 20 are formed.

The vertical groove portions 27 extend along the longitudinal direction and are arranged at intervals along the width direction. The longitudinal groove portion 27 is formed over the entire length in the longitudinal direction so as to divide each of the front core portion 21, the intermediate core portion 22, and the rear core portion 23 in the width direction.
The lateral groove portions 28 extend along the width direction and are arranged at intervals along the longitudinal direction. The lateral groove portion 28 is formed over the entire length in the width direction so as to divide each of the front core portion 21, the intermediate core portion 22, and the rear core portion 23 in the longitudinal direction. In the present embodiment, the boundary groove portion 26 formed in the boundary portions P1 and P2 is not included in the lateral groove portion 28.
By providing the longitudinal groove portion 27 and the lateral groove portion 28 that are easily deformed with a low basis weight, the flexibility of the absorbent core 20 can be enhanced. Further, the liquid absorption rate of the absorbent core 20 can be increased by drawing the liquid into the vertical groove portion 27 and the horizontal groove portion 28.

  The peripheral groove portion 29 is formed along the outer edge in the longitudinal direction of the high basis weight portion 24. By providing the peripheral groove portion 29 that is easily deformed at a low basis weight, deformation around the high basis weight portion 24 is absorbed by the peripheral groove portion 29, so that the high basic weight portion 24 is less susceptible to the influence of the surrounding deformation.

  The configuration of the vertical groove portion 27, the horizontal groove portion 28, and the peripheral groove portion 29 is not limited to the configuration described in FIGS. 3 and 4, and is based on the shape of the absorbent core 20, the required function, and the like. Is set as appropriate. Further, in the napkin 1, the absorbent core 20 may not have at least one of the longitudinal groove portion 27, the lateral groove portion 28, and the peripheral groove portion 29.

  The widths of the vertical groove portion 27, the horizontal groove portion 28, and the peripheral groove portion 29 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 peripheral groove part 29, the vertical groove part 27, and the horizontal groove part 28 is 0.5 mm or more and 10 mm or less, for example.

  Further, it is preferable that the longitudinal groove portion 27 of the intermediate core portion 22 is wider than the peripheral groove portion 29 because deformation along the excretion portion of the absorbent core is easily induced. In that case, the width of the longitudinal groove portion 27 of the intermediate core portion 22 is preferably larger than the peripheral groove portion 29 by 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less.

[Detailed configuration of pressing groove]
Unlike each groove part of low basic weight, the pressing groove part 16 shown in FIG.2 and FIG.3 forms a groove | channel by being squeezed from the surface sheet 12 toward the absorptive core 20 in the thickness direction. Thereby, since the bottom part of the pressing groove part 16 has a high density compared with another area | region and rigidity becomes high relatively, it becomes difficult to deform | transform with respect to external force. Therefore, when the external force which goes to the width direction inward is added to the napkin 1, the pressing groove part 16 can raise the area | region between the pressing groove parts 16 which make a pair up thickness direction. In other words, the squeezing groove 16 can define a deformation region with respect to an external force, and can induce deformation according to the shape of the squeezing groove 16.
Therefore, by forming the compressed groove 16 as follows, desired deformation can be induced to the absorbent core 20 and inappropriate deformation of the front core portion 21 and the rear core portion 23 can be suppressed. .

  FIG. 8 is a plan view showing the configuration of the compressed groove 16 formed in the absorbent core 20. In the same figure, illustration of the high basic weight part 24, the low basic weight part 25, the boundary groove part 26, the vertical groove part 27, the horizontal groove part 28, the peripheral groove part 29, etc. is abbreviate | omitted.

The pressing groove part 16 has a front pressing groove part 161, an intermediate pressing groove part 162, and a rear pressing groove part 163, respectively.
The intermediate pressing groove part 162 is formed in the intermediate core part 52, and bulges outward in the width direction while extending in the longitudinal direction. The pair of intermediate pressing groove portions 162 oppose each other in the width direction.
The front squeezing groove 161 is located in front of the intermediate squeezing groove 162 in the longitudinal direction, and bulges outward in the width direction while extending in the longitudinal direction. The pair of front pressing groove portions 161 are connected to each other at the front end portion in the longitudinal direction.
The rear squeezing groove 163 is located behind the intermediate squeezing groove 162 in the longitudinal direction, and bulges outward in the width direction while extending in the longitudinal direction. The pair of rear pressing groove portions 163 are connected to each other at the rear end portion in the longitudinal direction.

In this embodiment, a pair of pressing groove part 16 has two pairs of constriction parts 16a and 16b which adjoin mutually toward the width direction inner side.
The constricted portion 16a is configured as a portion where the intermediate compressed groove portion 162 and the forward compressed groove portion 161 are in contact with each other. The intermediate squeezing groove 162 and the front squeezing groove 161 bulge from the constricted part 16a as a starting point.
The constricted portion 16b is configured as a portion where the intermediate compressed groove portion 162 and the rear compressed groove portion 163 are in contact with each other. The intermediate squeezing groove 162 and the rear squeezing groove 163 bulge starting from the constricted part 16b.

  As described above, when an external force in the width direction is applied to the intermediate core portion 22, a region between the paired intermediate pressing groove portions 162 is raised in the thickness direction. In the constricted portions 16a and 16b, since the highly rigid compressed groove travels inward in the width direction, propagation of the deformation between the intermediate compressed groove portions 162 in the longitudinal direction forward and backward can be cut off. That is, the constricted portions 16 a and 16 b define the front end portion and the rear end portion of the bulge that can be formed between the intermediate compressed groove portions 162.

In the present embodiment, the constricted portions 16a and 16b are both formed in the boundary regions P10 and P20 including the boundary portions P1 and P2.
The boundary region P10 refers to a region including the boundary portion P1, and includes a region adjacent to the boundary portion P1 of the front core portion 21 and a region adjacent to the boundary portion P1 of the intermediate core portion 22. Similarly, the boundary region P20 refers to a region including the boundary portion P2, and includes a region adjacent to the boundary portion P2 of the rear core portion 23 and a region adjacent to the boundary portion P2 of the intermediate core portion 22. In the present embodiment, the boundary region P10 is a region including the taper portion 21a to the portion where the end 24a of the intermediate core portion 22 is formed, and the boundary region P20 is formed from the taper portion 23a to the intermediate core portion 22. It is assumed that the region includes the portion where the end 24b is formed.

  Since the constricted portions 16a and 16b of the present embodiment are both located in the boundary regions P10 and P20, the deformation induced by the intermediate squeezing groove portion 162 is limited to the boundary regions P10 and P20. Propagation to the core part 23 can be prevented. Therefore, it is possible to prevent the front core portion 21 and the rear core portion 23 from being deformed due to the external force in the width direction applied to the intermediate core portion 22 by the constricted portions 16a and 16b.

  Further, the napkin 1 may have one or a plurality of auxiliary rear grooves 164 that are formed between the pair of rear pressing grooves 163 and extend in the width direction. By the auxiliary rear groove 164, the shape of the rear core portion 23 can be guided to a desired shape.

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

(Absorbent core material)
Examples of hydrophilic fibers contained in the absorbent core 20 include cellulose-based hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin-based fibers such as polyethylene and polypropylene, and condensations such as polyester and polyamide. 1 type (s) or 2 or more types chosen from system fiber etc. can be used.
Examples of the water-absorbing polymer contained in the absorbent core 20 include sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, cross-linked sodium polyacrylate, starch-acrylic acid graft copolymer, and isobutylene-maleic anhydride. 1 type (s) or 2 or more types chosen from a copolymer, its saponification thing, poly aspartic acid, etc. can be used.

(Basis weight of front core part, rear core part, high basis weight part and low basis weight part)
The basis weight of the front core portion 21 and the rear core portion 23 is preferably 100 g / m ² or more and 700 g / m ² or less, more preferably 150 g / m ² or more and 620 g / m ² or less.
The basis weight of the high basis weight portion 24 is preferably 400 g / m ² or more and 1000 g / m ² or less, more preferably 500 g / m ² or more and 900 g / m ² or less.
The basis weight of the low basis weight portion 25 is preferably 90 g / m ² or more and 600 g / m ² or less, more preferably 140 g / m ² or more and 500 g / m ² or less.

The basis weight of the high basis weight part 24 is preferably greater than the basis weight of the front core part 21 and the rear core part 23 by 50 g / m ² or more, and more preferably 100 g / m ² or more.
The basis weight of the low basis weight portion 25 is preferably smaller than the basis weight of the front core portion 21 and the rear core portion 23 by 10 g / m ² or more, and more preferably 20 g / m ² or less.

(Measurement method of basis weight of each part of absorber)
Each part of the absorbent core 20 to be measured is cut using a single blade razor manufactured by Feather, and small pieces are obtained so as to have 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.

(Thickness of the front core portion, the rear core portion, the high basis weight portion, and the low basis weight portion)
The thickness of each part in the thickness direction can be set in consideration of the basis weight.
The thickness of the front core part 21 and the rear core part 23 is preferably 2 mm or more and 12 mm or less, more preferably 3 mm or more and 10 mm or less.
The thickness of the high basis weight part 24 is preferably 3 mm or more and 15 mm or less, more preferably 5 mm or more and 13 mm or less.
The thickness of the low basis weight part 25 is preferably 2 mm or more and 10 mm or less, more preferably 3 mm or more and 8 mm or less.

(Measurement method of thickness of each part of absorber)
The measurement of the thickness of the absorber 11 which is a measurement target is performed by measuring the thickness of a small piece cut out in order to measure the basis weight of each part. A measurement part of a small piece cut out from the absorbent article is pressurized at a pressure of 5 kPa for 10 minutes, and measurement is performed immediately after dewetting. An acrylic plate having a size of 20 mm × 20 mm and a thickness of 3 mm is placed on the absorber 3 in the central area of the sample after dewetting, and a non-contact type laser displacement meter (laser head LK-G30, displacement meter LK- manufactured by KEYENCE) GD500) is used to measure the thickness of the sample. When the size of the cut piece is small and difficult to measure with a non-contact type laser displacement meter, the cross section of the cut sample is, for example, 20 to 100 using a microscope (VHX-1000 manufactured by KEYENCE). You may observe and measure at double magnification.

<Other embodiments>
The arrangement of the low basis weight part and the high basis weight part may be any arrangement as long as the low basis weight part can effectively exhibit a buffering action against an external force.

FIG. 9 is a plan view schematically showing the absorbent core 40 of the napkin 2 according to another embodiment of the present invention.
In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  The absorbent core 40 of the napkin 2 includes a front core portion 41 and a rear core portion 43 that are opposed to each other in the longitudinal direction, and an intermediate core portion 42 that is positioned between the front core portion 41 and the rear core portion 43.

The intermediate core portion 42 includes a high basis weight portion 44 and a low basis weight portion 45. In FIG. 9, the high basis weight portion 44 is indicated by a high-density dot pattern, and the low basis weight portion 45 is indicated by a low-density dot pattern.
The high basis weight portion 44 has a higher basis weight than the front core portion 41, the rear core portion 43, and the low basis weight portion 45.
The low basis weight portion 45 has a lower basis weight than the high basis weight portion 44, the front core portion 41, and the rear core portion 43, and is formed surrounding the periphery of the high basis weight portion 24.

The high basis weight portion 44 has a length L2 that is shorter than the length L1 of the intermediate core portion 42 in the present embodiment.
Accordingly, the end portions 44a and 44b of the high basis weight portion 44 are arranged to be spaced apart from the boundary portions P1 and P2 in the longitudinal direction inner side, and the low basis weight portion 45 is located on the outer side in the longitudinal direction of the end portions 44a and 44b. It becomes. That is, the low basis weight portion 45 is formed so as to surround the periphery of the high basis weight portion 44. Therefore, the low basic weight part 45 can be arrange | positioned over the full width direction full length of the area | region adjacent to boundary part P1, P2 in the intermediate | middle core part 42. FIG.

  As described in the first embodiment, the low basis weight portion 45 is largely compressed and deformed when an external force directed inward in the width direction is applied, and acts as a buffer region for the external force. For this reason, by providing the low basis weight portion 45 in the entire region adjacent to the boundary portions P1 and P2 of the intermediate core portion 42, the buffering action of external force is enhanced, and the front core portion 41 and the rear core portion 43 are inappropriately deformed. Can be prevented more reliably. Accordingly, liquid leakage in the front core portion 41 and the rear core portion 43 can be prevented.

  Furthermore, the high basic weight part 44 and the low basic weight part 45 may be arrange | positioned as shown in FIG.

In the example shown in FIG. 10A, the high basis weight portion 44 and the low basis weight portion 45 are formed by entering the front core portion 41, the front end portion 44a is in the front core portion 41, and the rear end portion 44b is the intermediate core portion. 42.
In the example shown in FIG. 10B, the high basis weight portion 44 and the low basis weight portion 45 are formed to enter the rear core portion 43, the front end portion 44a is in the intermediate core portion 42, and the rear end portion 44b is the rear core portion. 43.

  Also by this, the low basic weight part 45 is arrange | positioned around the high basic weight part 44, and acts as a buffer area | region of the external force which goes to the width direction inner side. Accordingly, inappropriate deformation of the front core portion 41 and the rear core portion 43 can be prevented, and liquid leakage in the front core portion 41 and the rear core portion 43 can be prevented.

10A and 10B, in the case where the high basis weight portion 44 extends to the front core portion 41 or the rear core portion 43, the basis weight of the low basis weight portion 45 and the front core portion 41 or the rear core. The basis weight of the portion 43 is compared as follows.
In the case where the high basis weight portion 44 extends to the front core portion 41, the basis weight of the region in front of the end portion 44 a is set to the front core portion 41 with the longitudinal end portion 44 a of the high basis weight portion 44 as a boundary. The basis weight is defined, and this basis weight is compared with the basis weight of the low basis weight portion 45. Similarly, in the case where the high basis weight portion 44 extends to the rear core portion 43, the basis weight in the region behind the end portion 44 b is set to the rear core with the longitudinal end portion 44 b of the high basis weight portion 44 as a boundary. The basis weight of the portion 43 is defined, and this basis weight is compared with the basis weight of the low basis weight portion 45.

  In the case where the high basis weight portion 24 extends from the intermediate core portion 22 to at least one of the front core portion 21 and the rear core portion 23 as in the embodiments of FIG. 10, In the front core part 21, the length is 30% or less of the length of the front core part 21, and further 20% or less. In the rear core part 23, the length is 20% of the length of the rear core part 23. Hereinafter, it is preferably 10% or less for obtaining a good wearing feeling and fit.

  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. For example, the embodiment of the present invention can be an embodiment in which the embodiments are combined.

  One of the front core portion and the rear core portion of the absorbent core may have a tapered portion, or as shown in FIGS. 9 and 10, none of them may have a tapered portion.

  The boundary groove part may be formed only between the front core part and the intermediate core part, or may be formed only between the rear core part and the intermediate core part. Or an absorptive core does not need to have a boundary groove part.

  Further, only one pair of constricted portions of the compressed groove portion may be formed in the boundary region, or three or more pairs of constricted portions may be formed in the boundary region. Or a pressing groove part does not need to have a constriction part.

  In each above embodiment, although the example of the sanitary napkin was shown as an absorbent article, it is not limited to this. The absorbent article of the present invention may be, for example, an incontinence pad, a cage sheet, a disposable diaper, or the like.

  This invention discloses the following absorbent articles further regarding embodiment mentioned above.

<1> A front core portion and a rear core portion that face each other in the longitudinal direction, and an intermediate core portion that is located between the front core portion and the rear core portion and is narrower than the front core portion and the rear core portion. And the intermediate core portion has a higher basis weight than the front core portion and the rear core portion, and a high basis weight portion formed at the center in the width direction, and the front core. An absorbent article having a lower basis weight than the rear core portion and a low basis weight portion formed around the high basis weight portion.
<2> The absorbent article according to <1>, wherein the end portion in the longitudinal direction of the high basis weight portion has a shape in which a width gradually decreases toward the tip.
<3> The absorbent article according to <2>, wherein an end portion in a longitudinal direction of the high basis weight part has an arc shape or an elliptic arc shape.
<4> The absorbent article according to any one of <1> to <3>, wherein the high basis weight portion has a length equal to or less than a length of the intermediate core portion along the longitudinal direction. The said low basic weight part is an absorbent article formed surrounding the periphery of the said high basic weight part.
<5> The absorbent article according to any one of <1> to <4>, wherein at least one of the front core portion and the rear core portion is a boundary portion between the intermediate core portion. An absorptive article which has a taper part which adjoins and is formed and the width decreases gradually toward the middle core part.
<6> The absorbent article according to <5>, wherein an outer edge line of the tapered portion is configured by a straight line extending in a rotation angle direction with respect to an axis parallel to the longitudinal direction, and the rotation angle θ is 20 to 80 degrees, preferably 30 to 70 degrees absorbent article.
<7> The absorbent article according to any one of <1> to <6>, wherein the absorbent core has a basis weight lower than the low basis weight part, and the front core part and An absorbent article further comprising a boundary groove portion located between at least one of the rear core portion and the intermediate core portion.
<8> The absorbent article according to any one of <1> to <7>, wherein the surface sheet is disposed on the absorbent core, and is formed on the surface sheet and the absorbent core. And a pair of pressing groove portions extending in the longitudinal direction and facing each other in the width direction, wherein the pair of pressing groove portions are close to each other inward in the width direction, and the front core portion and An absorbent article having at least one pair of constricted portions formed in a boundary region including a boundary portion between at least one of the rear core portions and the intermediate core portion.
<9> The absorbent article according to any one of <1> to <8>, wherein the absorbent core is covered with a core wrap sheet, and the core wrap sheet is formed in the intermediate core portion. An absorbent article that extends outward from the widthwise end of the absorbent core and has a folded portion.
<10> The absorbent article according to any one of <1> to <9>, wherein the absorbent core extends in the longitudinal direction and is arranged at intervals along the width direction. An absorbent article having a longitudinal groove portion having a lower basis weight than the surroundings.
<11> The absorbent article according to <10>, wherein the longitudinal groove portion is formed over the entire length in the longitudinal direction so as to divide each of the front core portion, the intermediate core portion, and the rear core portion in the width direction. Absorbent articles.
<12> The absorbent article according to <10> or <11>, wherein the longitudinal groove portion is provided in the intermediate core portion and is wider than the peripheral groove portion.
<13> The absorbent article according to <12>, wherein the width of the longitudinal groove portion of the intermediate core portion is 0.5 mm or more and 5 mm or less larger than the peripheral groove portion, preferably 1 mm or more and 3 mm or less. Sex goods.
<14> The absorbent article according to any one of <1> to <13>, wherein the absorbent core extends along the width direction and is arranged at intervals along the longitudinal direction. An absorbent article having a lateral groove portion having a lower basis weight than the surroundings.
<15> The absorbent article according to <14>, wherein the lateral groove portion extends over the entire length in the width direction so as to divide each of the front core portion, the intermediate core portion, and the rear core portion in the longitudinal direction X. Is formed.
<16> The absorbent article according to any one of <1> to <15>, wherein the intermediate core part has a peripheral groove part along an outer edge of the high basis weight part. .
<17> The absorbent article according to any one of <10> to <16>, wherein the vertical groove portion, the horizontal groove portion, and the peripheral groove portion sink downward from an upper surface in a thickness direction of the absorbent core. Absorbent article that is a groove to be inserted.
<18> The absorbent article according to any one of <10> to <17>, wherein the longitudinal groove portion, the lateral groove portion, and the peripheral groove portion have a width of 0.5 mm to 10 mm, preferably An absorptive article which is 1 mm or more and 5 mm or less.
<19> The absorbent article according to any one of <10> to <18>, wherein depths of the longitudinal groove portion, the lateral groove portion, and the peripheral groove portion are 0.5 mm or more and 10 mm or less. Absorbent article.
<20> The absorbent article according to any one of <1> to <19>, wherein a width of a middle portion in the longitudinal direction of the high basis weight portion is 15 mm or more and 60 mm or less, preferably 20 mm. The absorbent article which is 50 mm or less.
<21> The absorbent article according to any one of <1> to <20>, wherein a basis weight of the high basis weight part is 400 g / m ² or more and 1000 g / m ² or less, preferably Is an absorbent article of 500 g / m ² or more and 900 g / m ² or less.
<22> The absorbent article according to any one of <1> to <21>, wherein a basis weight of the low basis weight part is 90 g / m ² or more and 600 g / m ² or less, preferably Is 140 g / m ² or more and 500 g / m ² or less.
<23> The absorbent article according to any one of <1> to <22>, wherein a width of the front core portion and the rear core portion is 60 mm or more and 100 mm or less, preferably 70 mm or more. Absorbent article which is 90 mm or less.
<24> The absorbent article according to any one of <1> to <23>, wherein the front core portion and the rear core portion 23 have a thickness of 2 mm to 12 mm, preferably 3 mm or more. An absorbent article that is 10 mm or less.
<25> The absorbent article according to any one of <1> to <24>, wherein a basis weight of the front core portion and the rear core portion is 100 g / m ² or more and 700 g / m ² or less. Absorbent articles, preferably 150 g / m ² or more and 620 g / m ² or less.
<26> The absorbent article according to any one of <1> to <25>, wherein the width of the intermediate core portion is 40 mm or more and 75 mm or less, preferably 50 mm or more and 70 mm or less. Absorbent article.
<27> The absorbent article according to any one of <1> to <24>, wherein the length of the intermediate core portion in the longitudinal direction is 60 mm or more and 170 mm or less, preferably 80 mm or more and 160 mm or less. There is an absorbent article.
<28> The absorbent article according to any one of <1> to <27>, which is a sanitary napkin.

1, 2 ... Absorbent articles (Sanitary napkins, napkins)
DESCRIPTION OF SYMBOLS 11 ... Absorber 12 ... Top sheet 13 ... Back sheet 16 ... Squeeze groove part 16a, 16b ... Constricted part 20, 40 ... Absorbent core 21, 41 ... Front core part 22, 42 ... Intermediate core part 23, 43 ... Back core part 24, 44 ... high basis weight part 24a, 24b, 44a, 44b ... end part (longitudinal direction end part)
25, 45 ... low basis weight part 26 ... boundary groove part 21a, 23a ... taper part 30 ... core wrap sheet P1, P2 ... boundary part P10, P20 ... boundary region

Claims (6)

A sanitary napkin provided with an absorbent body between a top sheet and a back sheet, and the top sheet and the back sheet,
The absorber comprises an absorbent core and a core wrap sheet that covers the absorbent core,
The absorbent core is positioned between the front core portion and the rear core portion facing each other in the longitudinal direction, and is narrower than the front core portion and the rear core portion. possess an intermediate core portion,
The intermediate core part is
A high basis weight part having a higher basis weight than the front core part and the rear core part, formed at the center in the width direction;
The front core portion and has a lower basis weight than the rear core section, seen including and a low basis weight portions formed around the high basis weight portion,
A main body adhesive portion provided on the outer surface of the back sheet;
A pair of wings arranged to overlap the intermediate core part with respect to the longitudinal direction and extending outward in the width direction from the intermediate core part;
Sanitary napkin . The sanitary napkin according to claim 1,
The longitudinal end portion of the high basis weight portion has a shape in which the width gradually decreases toward the tip.
Sanitary napkin . The sanitary napkin according to claim 1 or 2,
The high basis weight portion has a length equal to or shorter than the length of the intermediate core portion along the longitudinal direction,
The low basis weight part is formed to surround the high basis weight part.
Sanitary napkin . A sanitary napkin according to any one of claims 1 to 3,
At least one of the front core portion and the rear core portion has a tapered portion that is formed adjacent to a boundary portion between the front core portion and the intermediate core portion and has a width that gradually decreases toward the intermediate core portion.
Sanitary napkin . A sanitary napkin according to any one of claims 1 to 4,
The absorbent core is
It has a lower basis weight than the low basis weight part, and further has a boundary groove part located between at least one of the front core part and the rear core part and the intermediate core part.
Sanitary napkin . A sanitary napkin according to any one of claims 1 to 5,
A surface sheet disposed on the absorbent core;
A pair of pressing grooves formed on the topsheet and the absorbent core, extending in the longitudinal direction and facing each other in the width direction; and
The pair of compressed grooves are
At least a pair of constricted portions formed in a boundary region adjacent to each other toward the inner side in the width direction and including a boundary portion between at least one of the front core portion and the rear core portion and the intermediate core portion; Have
Sanitary napkin .

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