JP2013034860A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which is comfortable with a dry feeling even immediately after excretion since excreted liquid quickly shifts into an absorber, wet spread of a surface sheet is small and also a liquid remaining amount of the surface sheet is small.SOLUTION: The absorber 4 of an incontinence pad 1 includes an absorbent core 40 and a core wrapping sheet 44 for wrapping the absorbent core 40. When the entire length in the longitudinal direction of the absorbent core 40 is equally divided into three and sectioned into three areas of a front area A, a center area B and a rear area C, at least the center area B has small absorption parts 41, which contain water absorbing polymer and are dispersed and arranged in a plane direction, and a groove 43 for partitioning the small absorption parts 41, and the occupancy rate of the skin abutting surface side surface 41s of the small absorption parts 41 in the center area B is 50 to 80%. For the core wrapping sheet 44, the liquid transmission speed of the part positioned more on the skin abutting surface side than the absorbent core 40 is 5 seconds or shorter, and for the water absorbing polymer, an absorption speed measured according to a DW method (30 seconds) is 13 ml/g or higher.

Description

  The present invention relates to absorbent articles such as incontinence pads, urine-absorbing pads, and sanitary napkins.

  2. Description of the Related Art Conventionally, in absorbent articles, it is known to improve the absorption performance of an absorbent body by incorporating a water-absorbing polymer having a high-speed water-absorbing ability into the absorbent body or dividing the absorbent body into a plurality of parts. For example, the absorber in Patent Document 1 has two layers, an upper layer that is a trapping / distribution layer and a lower layer that is a storage layer, and the storage layer can absorb 40% or more of the total amount in 10 seconds or less. Contains an absorber gelling agent. Moreover, the absorber of patent document 2 is comprised from the 2 parallel strip | belt-shaped absorber group which consists of several strip | belt-shaped absorbers in parallel on both sides of a groove | channel, and patent document 2 improves the absorption performance of a crotch part. It is described to do. Moreover, the absorber of patent document 3 has many independent absorption parts arrange | positioned over the article plane direction.

Japanese Patent No. 3466184 JP 2004-159820 A JP 2009-172363 A

  Patent Documents 1 and 2 do not describe the liquid permeability of the excreted liquid, although it is described that the absorption performance of the absorber is improved. Even if a water-absorbing polymer with high-speed water absorption capability is used or the absorbent is divided, if the excreted liquid does not move quickly into the absorbent body, the liquid accumulates on the skin contact surface of the absorbent article and leaks. Will lead to. As a result, the dry feeling of the absorbent article is also reduced. Further, in Patent Document 3, a large number of absorbing portions are fixed to an intermediate sheet disposed between the surface sheet and the absorber, and the intermediate sheet is provided with a liquid drawing function, thereby providing a surface sheet. It is described that the remaining amount of liquid is reduced. However, it is considered that the intermediate sheet has a high liquid diffusion performance, and Patent Document 3 does not suggest any improvement in the liquid permeation function of the intermediate sheet. Further, Patent Document 3 does not suggest any surface occupancy ratio on the skin contact surface side of the absorbent portion in the absorbent body.

  Therefore, the problem of the present invention is that the excreted liquid quickly migrates into the absorbent body, the wetting spread of the topsheet is small, and the remaining amount of liquid on the topsheet is small. It relates to sex goods.

  The present invention comprises a surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between both sheets, An absorbent article having an absorbent core and a core wrap sheet that wraps the absorbent core, wherein the absorbent core is divided into three equal parts in the longitudinal direction, the front region, the central region, and the rear When the area is divided into three areas, at least the central area includes a large number of small absorbent parts dispersed in the plane direction including the water-absorbing polymer, and grooves that partition the small absorbent parts. In the central region, the area occupancy of the skin contact surface side surface of the small absorbent portion is 50 to 80%, and the core wrap sheet is a portion located on the skin contact surface side of the absorbent core. The liquid permeation rate is 5 seconds or less, and the water-absorbing polymer conforms to the DW method. Measured absorption rate is 13ml / g (30sec) above, is to provide an absorbent article.

  According to the present invention, the excreted liquid quickly migrates into the absorbent body, the wetting spread of the topsheet is small, and the remaining amount of liquid on the topsheet is small, so that a dry feeling can be obtained immediately after excretion and a comfortable absorbent article Is provided.

FIG. 1 is a partially broken plan view schematically showing a skin contact surface side (surface sheet side) of an incontinence pad that is a first embodiment of the absorbent article of the present invention. The stretched state refers to a state in which the incontinence pad is expanded until it reaches a design dimension (same as the dimension when the incontinence pad is expanded in a planar shape in a state where the influence of the elastic member is completely eliminated). FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a cross-sectional view schematically showing a cross section along the width direction of the absorbent article according to the second embodiment of the present invention, which corresponds to FIG. Fig.4 (a) is a top view which shows typically the absorptive core in 3rd Embodiment of this invention, FIG.4 (b) is II-II sectional drawing of Fig.4 (a). FIG. 5 is a cross-sectional view schematically showing a cross section along the width direction of the absorbent body according to the fourth embodiment of the present invention, and corresponds to a part of FIG. FIG. 6 is a plan view schematically showing the absorbent core in the fourth embodiment of the present invention, which is a view corresponding to FIG.

Below, this invention is demonstrated, referring drawings based on the preferable embodiment.
As shown in FIGS. 1 and 2, an incontinence pad 1 (hereinafter also referred to as a pad 1) that is an embodiment of the present invention is a surface sheet 2 disposed on the skin contact surface side, the non-skin contact surface side And the absorber 4 interposed between the two sheets. The absorbent body 4 includes an absorbent core 40 and a core wrap sheet 44 that wraps the absorbent core 40. When the absorbent core 40 is divided into three regions of a front region A, a central region B, and a rear region C by dividing the entire length in the longitudinal direction into three equal parts, at least the central region B includes a water-absorbing polymer. And the small absorption portions 41 distributed in the plane direction and the grooves 43 that partition the small absorption portions 41. The occupation ratio of the skin contact surface side surface 41s of the small absorbent portion 41 in the central region B is 50 to 80%. The core wrap sheet 44 has a liquid permeation speed of 5 seconds or less at a portion located on the skin contact surface side from the absorbent core 40. The water-absorbing polymer has an absorption rate measured according to the DW method of 13 ml / g (30 sec) or more.

In addition, the longitudinal direction (longitudinal direction) of the absorbent article is a direction that coincides with the wearer's front-rear direction when worn, and the width direction of the absorbent article is a direction substantially orthogonal to the longitudinal direction. In the figure, the direction indicated by X (X direction) is the longitudinal direction of the absorbent article (absorber, absorbent core), and the direction indicated by Y (Y direction) is the absorbent article (absorber, absorption). The width direction of the sex core). In the present embodiment, the longitudinal direction of the absorber, the absorbent core, and the three-dimensional gather also coincides with the X direction.
Moreover, the plane direction of an absorbent article (absorber, absorbent core) is a direction in which an XY plane composed of a longitudinal direction (X direction) and a width direction (Y direction) of the absorbent article extends. Moreover, the thickness direction of an absorbent article is a direction orthogonal to XY plane, and is a direction shown by Z in the figure. Further, the skin contact surface is a surface directed to the wearer's skin side when the absorbent article is worn in the absorbent article, and the non-skin contact surface is the skin when the absorbent article is worn in the absorbent article. This is the surface that is directed to the opposite side (usually the clothing side).

As shown in FIG. 1, the incontinence pad 1 has a substantially rectangular shape that is long in the X direction, and both end edges in the longitudinal direction are formed in an arc shape. The top sheet 2 is liquid permeable, and one surface of the top sheet 2 constitutes the skin contact surface of the incontinence pad 1. The back sheet 3 has liquid impermeability or liquid impermeability, and one surface of the back sheet 3 constitutes a surface on the non-skin contact surface side of the incontinence pad 1 that faces the clothing side.
The top sheet 2, the back sheet 3, and the absorber 4 each have a shape that is long in the same direction as the longitudinal direction (X direction) of the incontinence pad 1. As shown in FIG. 2, the absorber 4 is nipped and fixed between the top sheet 2 and the back sheet 3. The topsheet 2 covers the entire area of the skin contact surface 4a of the absorbent body 4, and further extends outward in the Y direction from the left and right side edges along the X direction of the absorbent body 4. Further, the back sheet 3 covers the whole area of the non-skin contact surface 4 b of the absorber 4, and further extends outward in the Y direction from both side edges of the absorber 4. Further, the top sheet 2 and the back sheet 3 also extend outward in the X direction from the front end and the rear end in the X direction of the absorber 4, respectively, and adhesive, heat seal, super They are joined together by a known joining means such as a sonic seal.

  The pad 1 is used while being fixed to a wearer's clothing (for example, underwear such as shorts or pants), and the clothing side surface (non-skin contact surface) of the back sheet 3 is directed to the clothing side when worn. The pad 1 includes a slip prevention layer 10 made of an adhesive on the clothing side surface (non-skin contact surface) of the back sheet 3 as a fixing means that can be fixed to the clothing. The slippage preventing layer 10 is provided by applying a pressure sensitive adhesive such as a hot melt pressure sensitive adhesive to a predetermined location, and is covered with a release sheet (not shown) made of a film, a nonwoven fabric, paper or the like before the pad 1 is used. Yes.

  The absorber 4 includes an absorbent core 40 including an absorbent material (fiber material such as pulp, water-absorbing polymer, etc.). The absorbent body 4 in this embodiment is configured by covering the absorbent core 40 with a core wrap sheet 44 made of tissue paper or a water-permeable nonwoven fabric. In the present embodiment, the core wrap sheet 44 includes a core wrap sheet 44 a that covers the surface of the absorbent core 40 on the skin contact surface side, and a core wrap that covers the surface of the absorbent core 40 on the non-skin contact surface side. And a sheet 44b. The core wrap sheet 44a on the skin contact surface side covers almost the entire area of the absorbent core 40 on the skin contact surface side. The core wrap sheet 44b on the non-skin contact surface side covers almost the entire area of the absorbent core 40 on the non-skin contact surface side, and is folded back in the width direction (inward) at both sides of the absorbent core 40. It is.

  The absorbent core 40 is configured by holding a water-absorbing polymer between fiber materials such as pulp fibers. Between the top sheet 2 and the absorbent body 4 and between the absorbent body 4 and the back sheet 3 are bonded to each other by a pattern-coated adhesive (hot melt adhesive or the like) such as dots, spirals and stripes. Also good. For example, the absorber 4 may be bonded and fixed to the surface sheet 2 on both sides thereof. Further, the non-skin contact surface side of the absorbent body 4 may be bonded and fixed to the back sheet 3.

  As shown in FIG. 1, the absorbent core 40 is divided into three regions, a front region A, a central region B, and a rear region C, in the X direction. Specifically, the central region B is a region sandwiched between lines Y1 and N2 in the Y direction that divides the entire length of the absorbent core 40 in the X direction into three equal parts in plan view. The front region A is a region located in front of the wearer than the central region B when worn, and the rear region B is a region located behind the wearer than the central region B when worn. The central region B is an excretion-corresponding portion (portion where the excreted liquid is first absorbed) in the absorbent core 40.

  The absorbent core 40 according to the first embodiment includes small absorbent portions 41 that are dispersed and arranged in a plane direction including a water-absorbing polymer, and grooves 43 that partition the small absorbent portions 41. In this embodiment, the groove | channel 43 and the small absorption part 41 are formed in the whole planar direction of the absorptive core 40, and the planar view shape of the absorptive core 40 is the same as that shown to Fig.4 (a). is there. Thus, the shape of the absorptive core 40 which has the small absorption part 41 and the groove | channel 43 is also called block shape. The absorptive core 40 has a sea-island structure in which each of a large number of small absorption parts 41 is an island and the formation location of the groove 43 is the sea.

Specifically, in the first embodiment, as shown in FIG. 1, the absorbent core 40 includes a large number of small absorbent portions 41 arranged at predetermined intervals in the longitudinal direction (X direction) of the pad 1. The small absorbent portion rows 41X are formed, and a plurality of the small absorbent portion rows 41X are arranged at predetermined intervals in the width direction (Y direction) of the pad 1. In each small absorbent section row 41X, a groove 43 opened upward (on the topsheet 2 side) is disposed between the small absorbent sections 41 arranged at a predetermined interval in the Y direction. The grooves 43 are arranged between the small absorption parts 41 both in the longitudinal direction (X direction) and in the width direction (Y direction), and partition the small absorption parts 41.
In the first embodiment, the small absorbent portions 41 are arranged in a staggered manner on the absorbent core 40. In other words, in the small absorbent portion row 41X adjacent to each other, the X direction position of the small absorbent portion 41 is shifted. In other words, when the small absorbent portion 41 projects the small absorbent portion 41 in the predetermined small absorbent portion row in a direction (Y direction) perpendicular to the small absorbent portion row, the small absorbent portion row 41X of the adjacent small absorbent portion row 41X. It arrange | positions so that it may not correspond with the projection image of the small absorption part 41. FIG. In the example shown in FIG. 1, the positions of the small absorbent portions 41 in the X direction are shifted by a half pitch in the small absorbent portion rows 41 </ b> X adjacent to each other.
The small absorption part 41 is formed in a substantially identical rectangular shape in plan view. However, among many small absorption parts 41, the thing along the longitudinal direction both ends edge of the incontinence pad 1 which makes | forms circular arc shape is the shape match | combined with this edge shape.

Further, as shown in FIG. 2, in the first embodiment, the thickness T40 of the portion other than the groove 43 of the absorbent core 40 is substantially constant, and the surface 41s on the skin contact surface side of the small absorbent portion 41 is substantially rectangular. It is a shape and a substantially flat surface substantially parallel to the plane direction. And the groove | channel 43 formed in the absorptive core 40 does not penetrate the absorptive core 40 in the thickness direction (Z direction), and the depth Td of the groove | channel 43 is substantially constant. Thereby, the absorbent core 40 has a substantially constant thickness (distance in the Z direction from the surface on the non-skin contact surface side of the absorbent core 40 to the bottom surface of the groove 43), and is a thin continuous including the absorbent material. A layer 42 is provided. The thin continuous layer 42 is formed integrally with the small absorbent portion 41 and connects the small absorbent portion 41 in the planar direction on the non-skin contact surface side. Due to the presence of the thin continuous layer 42, the surface on the non-skin contact surface side of the absorbent core 40 is substantially flat with no unevenness, whereas the surface on the skin contact surface side is formed to protrude. It has unevenness due to the small absorption part 41 (convex part) and the groove 43 (non-convex part or concave part).
The thickness T40 of the absorbent core 40 is a Z-direction distance from the surface 41s of the small absorbent portion 41 to the bottom surface (surface on the non-skin contact surface side) of the absorbent core 40, as in the second embodiment. When the absorbent core 40 does not have the thin continuous layer 42, it is the thickness of the small absorbent portion 41.
Further, the small absorbent portion 41 is a portion having a relatively higher basis weight of the absorbent material than the lower portion 42d of the groove 43 (hereinafter also referred to as the groove lower portion 42d) in the thin continuous layer 42. Further, the density of the small absorbing portion 41 is higher than the density of the lower groove portion 42 d in the thin continuous layer 42.

  In the present embodiment, the side wall of the groove 43 is substantially orthogonal to the XY plane direction, and the area of the small absorbing portion 41 in the plane direction is substantially constant along the Z direction. However, for example, the small absorption part 41 may be formed in a trapezoidal shape in a side view so that the area in the planar direction becomes smaller toward the non-skin contact surface side.

  Particularly in the central region B, the thickness T40 of the absorbent core 40 is preferably 0.5 to 10 mm, more preferably 2.0 to 9.0 mm. The depth Td of the groove 43 (the same value as the thickness of the small absorption part) is preferably 0.5 to 10 mm, more preferably 0.5 to 7.0 mm. The ratio of the depth Td of the groove 43 to the thickness T40 of the absorbent core (Td / T40) is preferably 0.2 to 1, more preferably 0.5 to 1.

As shown in FIG. 1, the space | interval Lb between the skin contact surface side surfaces 41s of the small absorption part 41 in planar view becomes like this. Preferably it is 1.0-10 mm, More preferably, it is 2.5-4.5 mm. . The interval Lb between the surfaces 41s in the Y direction may be different from the interval between the surfaces 41s in the X direction.
Also, one of the small absorber unit 41, preferably, the area of the surface 41s of the skin contact surface side is 0.5～3.0Cm ^2, more preferably 0.6~1.5cm ^2.
It is preferable that 15 to 100, especially 50 to 80 small absorbing portions 41 are formed per 100 cm ² area. Moreover, when the small absorption part 41 has the small absorption part row | line | column 41X arrange | positioned by the predetermined interval in X direction like this embodiment, the small absorption part row | line | column 41X is preferably 3 to There are 11 rows, more preferably 5 to 9 rows (7 rows in the illustrated example).

  The area occupation ratio Q of the skin contact surface side surface 41s of the small absorbent portion 41 in the central region B of the absorbent core 40 is 50 to 80%. Preferably, the area occupation ratio Q is 50 to 70%, more preferably 50 to 65%, and still more preferably 50 to 60%.

<Calculation method of area occupancy Q>
The area occupation ratio Q is calculated according to the following formula.
Q = S1 / S2 × 100
(S1: total area of the skin contact surface side surface 41s of the small absorbent portion 41 in the central region B, S2: area of the central region B)
Note that the area S2 of the central region B is equal to the length L40y (see FIG. 1) in the width direction (Y direction) of the absorbent core 40, and the total length LBx of the central region B in the X direction (the longitudinal direction of the absorbent core 40 ( X direction) obtained by multiplying by 1/3 of the total length). Further, S1 is obtained by summing all areas of the portions located in the central region B among the surfaces 41s of the large number of small absorbing portions 41 in plan view. For the small absorption part 41 in which the lines N1 and N2 cross the surface 41s, the area of the portion of the surface 41s of the small absorption part 41 located on the inner side in the X direction of N1 and N2 is located in the central region B. The area of the part.

The core wrap sheet 44 has a liquid permeation speed P of 5 seconds or less at a portion located on the skin contact surface side from the absorbent core 40. When covering the skin contact surface side and the non-skin contact surface side of the absorbent core 40 with separate core wrap sheets as in the present embodiment, the portion located on the skin contact surface side of the absorbent core 40 The liquid permeation speed P is the liquid permeation speed of the core wrap sheet 44 a that covers the skin contact surface side of the absorbent core 40. The liquid permeation speed P of the core wrap sheet 44a (44) is preferably 4 seconds or less, and more preferably 3 seconds or less.
The liquid permeation rate P is measured as follows.

<Measurement method of liquid permeation rate P>
The core wrap sheet 44a (44) cut out to 60 mm × 60 mm is sandwiched and fixed from above and below by a pair of glass cylinders having a diameter of 35 mm through rubber packing. Under this condition, 40 g of physiological saline colored blue is supplied from the upper end of the upper cylinder. The time (liquid permeation time) from when the physiological saline reaches the core wrap sheet 44a (44) until it starts to flow from the lower end of the lower cylinder through the core wrap sheet 44a (44) is measured. The value of the liquid permeation time is defined as the liquid permeation speed P of the core wrap sheet. The cylinder has a cylindrical shape with a height of 75 mm, an inner diameter of 35 mm, and a wall thickness of 3 mm, and flange portions having an outer diameter of 60 mm are provided at both ends thereof. A liquid receiver 84 is disposed below the lower cylinder 83 (see the apparatus shown in FIG. 4 of JP 2007-135790 A).
When cutting out the core wrap sheet 44a (44) from the incontinence pad 1, the core wrap sheet 44a (44) is carefully peeled between the core wrap sheet 44a (44) and the other part (the surface sheet 2 or the absorbent core 40), and the core wrap sheet 44a (44) is cut into the above size and measured. When the core wrap sheet 44a (44) is bonded to other portions with an adhesive, the core wrap sheet 44a (44) is peeled off by the following procedure. That is, a cold spray is sprayed to solidify the adhesive. Then, while the adhesive is solidified, the core wrap sheet 44a (44) is carefully peeled off from other portions.

  Moreover, as for the water absorbing polymer contained in the small absorption part 41, the absorption rate measured according to DW method is 13 ml / g (30 sec) or more. The absorption rate V of the water-absorbing polymer is measured as follows. Hereinafter, a water-absorbing polymer whose absorption rate measured according to the DW method is not less than the above value is also referred to as a high-speed water-absorbing polymer. The high-speed water-absorbing polymer contained in the small absorption part 41 more preferably has an absorption rate of 14 ml / g (30 sec) or more. The upper limit of the absorption rate is not particularly limited, but is preferably 50 ml / g (30 sec) or less.

<Measurement method of absorption rate V>
The absorption rate ml / g (30 sec) by the DW method is measured by using a device (DemandWettabilityTester) generally known as a device for performing the DW method. Saline liquid level and polymer spray table [70 mmφ, No. 2 Filter paper with glass filter no. Adjust the height so that the upper surface of the base placed on 1 is the same height. On the polymer spray table, 0.3 g of the water-absorbing polymer to be measured is sprayed. The water absorption amount at the time when the water-absorbing polymer is sprayed is set to 0, and the water absorption amount after 30 seconds (this water absorption amount is measured by a burette scale indicating the amount of decrease in the physiological saline water level) is measured. The water absorption value obtained here is converted per 1.0 g of the water-absorbing polymer. The measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more.

  The process in which the liquid is absorbed in the pad 1 of the present embodiment will be described below. The liquid such as urine excreted to the pad 1 passes through the core wrap sheet 44a (44) in contact with the lower surface of the top sheet 2. The liquid that has passed through the core wrap sheet 44 a (44) moves to the surface 41 s side of the small absorbent portion 41, and is absorbed by the small absorbent portion 41 from the surface 41 s side or flows into the groove 43. It is pulled in from the side. Further, the liquid is guided in the groove 43, diffuses in the planar direction of the absorbent core 40, and is drawn into the small absorbent portion 41 around the excretion site.

In the pad 1 of the present embodiment, as described above, the liquid permeation speed P of the core wrap sheet 44a (44) is 5 seconds or less on the skin contact surface side of the absorbent core 40. For this reason, liquids, such as urine, permeate | transmit the inside of the core wrap sheet | seat 44a (44) quickly, and the wet area in the surface sheet 2 is hard to expand.
Further, the liquid transfer from the core wrap sheet 44a (44) to the small absorbent portion 41 occurs at a location where the core wrap sheet 44a (44) and the skin contact surface side surface 41s of the small absorbent portion 41 are in contact. For this reason, even if the liquid permeation of the core wrap sheet 44a (44) is fast, if the area occupation rate Q of the skin contact surface side surface 41s of the small absorbent portion 41 is too low in the central region B, the small absorption from the top sheet 2 The liquid transfer to the surface 41s side of the portion 41 is not performed quickly, and the wetted area of the topsheet 2 increases. On the other hand, if the area occupation ratio Q is too high, even if the liquid can quickly move from the top sheet 2 to the surface 41 s side of the small absorbent portion 41, the liquid drawing speed into the small absorbent portion 41 through the groove 43 is slow. turn into. Also in this case, since the transition from the topsheet 2 to the small absorbent portion 41 is not promoted by the liquid drawing into the small absorbent portion 41, the liquid remaining on the topsheet 2 and the expansion of the liquid wetting area cannot be eliminated.
On the other hand, since the area occupation ratio Q of the pad 1 of this embodiment is 50 to 80%, the high permeation speed of the core wrap sheet 44a is utilized to move from the top sheet 2 to the front surface 41s side of the small absorbent portion 41. The liquid is quickly transferred, and the speed of drawing the liquid into the small absorption part 41 through the groove 43 is fast. Furthermore, since the water absorption polymer in the small absorption part 41 has an absorption rate measured according to the DW method (30 sec) of 13 ml / g or more, liquid absorption by the small absorption part 41 is performed at high speed. As described above, in the pad 1 of the present embodiment, the liquid transfer speed from the top sheet 2 to the inside of the small absorbent portion 41 (inside the absorbent core 40) becomes very fast, and the wetting spread on the top sheet 2 immediately after discharge. In addition, the liquid remaining on the top sheet 2 can be suppressed, and a comfortable dry feeling can be obtained and high absorption performance can be obtained.

  Next, an incontinence pad according to another embodiment of the present invention will be described. In other embodiments, differences from the first embodiment will be mainly described, and the same points will be denoted by the same reference numerals and description thereof will be omitted. The points relating to the first embodiment described above are applied as appropriate to points not specifically mentioned.

FIG. 3 shows an incontinence pad 1A according to the second embodiment. In the incontinence pad 1A, the groove 43 penetrates the absorbent core 40 in the thickness direction, and the thin continuous layer 42 does not exist. In the pad 1A, the opening width of the groove 43 on the skin contact surface side of the absorbent core 40 and the opening width of the groove 43 on the non-skin contact surface side are formed substantially equal.
In addition, as for the absorbent article of this invention, the longitudinal direction both sides of the surface sheet 2 are extended from the both-sides edge of the absorber 4, and are wound down to the non-skin opposing surface side of the absorber 4 like the pad 1A. May be. In the pad 1 </ b> A, the wound top sheet 2 is bonded to the absorber 4 and / or the back sheet 3 between the absorber 4 and the back sheet 3.
Moreover, the absorbent article of this invention may be equipped with a pair of solid gathers 5 and 5 which stand on the wearer side on both sides thereof, like the pad 1A. The three-dimensional gathers 5 and 5 of the pad 1 </ b> A are arranged on both sides of the absorbent body 4 covered with the top sheet 2. More specifically, a waterproof sheet 6 having a certain width is disposed on both sides in the longitudinal direction of the incontinence pad 1 over substantially the entire length in the X direction. The three-dimensional gather 5 includes the waterproof sheet 6 and an elastic member 51 fixed to the waterproof sheet 6. One side edge portion of the waterproof sheet 6 is joined between the top sheet 2 and the back sheet 3 wound down to the non-skin contact surface side of the absorbent body 4, and the fixed end 53 of the three-dimensional gather 5. Is forming. The free end 52 of the three-dimensional gather 5 is composed of the other side edge of the waterproof sheet 6 and is fixed in a state where the elastic member 51 extends in the X direction. Both ends in the X direction of the three-dimensional gather 5 are fixed on the top sheet 2 on the absorber 4 in a face-down state. The free end portion 52 of the three-dimensional gather 5 stands on the wearer side due to the contraction of the elastic member 51 at portions other than both ends in the X direction.

A third embodiment of the present invention will be described based on FIG. The incontinence pad of the third embodiment is obtained by changing the absorbent core 40 of the incontinence pad 1 of the first embodiment to an absorbent core 40B shown in FIG. In the absorbent core 40B, the basis weight of the central region B is higher than the basis weights of the front region A and the rear region C. For this reason, the incontinence pad according to the third embodiment concentrates the absorbent material in the central region B, which is the excretion-corresponding portion of the absorbent core 40, and increases the drawing speed of the liquid into the absorbent core 40B in the central region B. be able to. As a result, the liquid quickly moves from the top sheet 2 into the absorbent core 40B, and the amount of liquid remaining on the top sheet 2 decreases.
The basis weight here is the basis weight of the absorbent material present in each region. For example, when the center region B is composed of pulp fibers and a water-absorbing polymer, the basis weight of the center region B is pulp. It is the sum of the basis weight of the fiber and the basis weight of the water-absorbing polymer.

In 3rd Embodiment, by making the basic weight of the small absorption part 41b of the center area | region B higher than the basic weight of the small absorption part 41a of the front area | region A, and the small absorption part 41c of the rear area | region C, The basis weight difference between the above regions is realized. The small absorption portion 41b in the central region B has a larger amount of absorbent material deposited per area than the small absorption portion 41a in the front region A and the small absorption portion 41c in the rear region C. Further, it is formed to be bulkier than the small absorbent portion 41a in the front region A and the small absorbent portion 41c in the rear region C. For this reason, even if the basis weight of the central region B is increased, the depth of the groove 43 is not reduced, and the function of the groove 43 that assists the drawing of the liquid into the small absorbent portion 41 is not impaired. The absorption performance of the absorption part 41 can be improved. In addition, the surface 41s on the skin contact surface side of the small absorbent portion 41 in the central region B is made closer to the core wrap sheet 44a (44) to facilitate liquid transfer from the core wrap sheet 44a to the small absorbent portion B.
From the viewpoint of forming the small absorbent portion 41b in the central region B more bulky than the small absorbent portion 41a in the front region A and the small absorbent portion 41c in the rear region C, the absorbent core 40B is made of pulp fibers or the like in the central region B. The basis weight Sqb of the fiber material is preferably higher than the basis weight Sq ′ of the fiber material such as pulp fiber in the front region A and the rear region C.

In the absorbent core 40B, the basis weight of the water absorbent polymer in the central region B is preferably higher than the basis weight of the water absorbent polymer in the front region A and the rear region C.
More preferably, in the absorbent core 40B, the basis weight Spb of the high-speed water-absorbing polymer in the central region B is higher than the basis weight Sp of the high-speed water-absorbing polymer in the front region A and the rear region C. For this reason, the absorptive core 40B can concentrate a high speed water absorbing polymer in the said area | region B, and can further raise the drawing-in speed of the liquid in the absorptive core 40B.

The basis weight Sqb (hereinafter also referred to as pulp basis weight) of the fiber material (particularly pulp fiber) in the central region B is preferably 250 to 600 g / m ² , more preferably 300 to 500 g / m ² . Pulp basis weight Sq before region A and the rear region C 'is preferably 100~220g / m ^2, more preferably a 100 to 200 g / m ^2. The ratio (Sqb / Sq ′) of the pulp basis weight Sqb of the central region B to the pulp basis weight Sq ′ of the front region A and the rear region B is preferably 1.2 to 3.0, more preferably 1.5 to 2.5.
The ratio (T40 / T40 ′) of the thickness T40 of the absorbent core 40 in the central region B to the thickness T40 ′ of the absorbent core 40 in the front region A and the rear region C is preferably 1.5 to 3.0. Yes, more preferably 1.8 to 2.5.
Further, the basis weight Spb of the high-speed water-absorbing polymer in the central region B is preferably 200 to 600 g / m ² , more preferably 300 to 500 g / m ² . The basis weight Sp ′ of the high-speed water-absorbing polymer in the front region A and the rear region C is preferably 50 to 300 g / m ² , more preferably 80 to 250 g / m ² . The ratio (Spb / Sp ′) of the basis weight Sp ′ of the high-speed water-absorbing polymer in the front region A and the rear region C to the basis weight Spb of the high-speed water-absorbing polymer in the central region B is preferably 1.2 to 3.0, More preferably, it is 1.5-2.5.

Next, a fourth embodiment of the present invention will be described based on FIG. The incontinence pad of the fourth embodiment is obtained by changing the absorbent body 4 of the incontinence pad 1 of the first embodiment to an absorbent body 4C shown in FIG. In the incontinence pad of the fourth embodiment, the liquid permeation speed P ′ is the liquid permeation speed of the core wrap sheet 44a (44) on the skin contact surface side of the small absorbent portion 41 in the central region B of the absorbent core 40. A continuous absorption layer 8 faster than P is laminated. For this reason, in the central region B, the water that has permeated the core wrap sheet 44a (44) quickly permeates the continuous absorption layer 8 at a faster permeation rate than the core wrap sheet, and reaches the surface 41s of the small absorbent portion 41. Transition. That is, the high liquid permeability in the continuous absorbent layer 8 facilitates the drawing of liquid from the top sheet 2 into the core wrap sheet 44a (inside the pad 1), and can reduce the amount of liquid remaining in the top sheet 2.
Regardless of whether the distribution region of the small absorption part 41 is wide or narrow (for example, distributed in substantially the entire absorbent core 40 or only in the central region B), the continuous absorption layer 8 is small in the central region B. What is necessary is just to be laminated | stacked on the absorption part 41, and may be laminated | stacked on the area | region wider than the center area | region B in the absorptive core 40. FIG. The continuous absorption layer 8 is planar or flat (flat).
Further, the liquid permeation rate P ′ of the continuous absorption layer 8 is a value of the liquid permeation time measured in the same manner as the method for measuring the liquid permeation rate P of the core wrap sheet 44a (44). Further, “the liquid permeation rate P ′ is faster than the liquid permeation rate P of the core wrap sheet 44a (44)” means that the liquid permeation measured for the continuous absorption layer 8 by the same method as the method for measuring the liquid permeation rate P. It means that the time is shorter than the liquid permeation time of the core wrap sheet measured as the liquid permeation rate P. The liquid permeation speed P ′ of the continuous absorption layer 8 is preferably 0.3 to 4 seconds, and more preferably 0.3 to 1.0 seconds.

As the continuous absorbent layer 8, a fiber aggregate made of pulp fibers or the like, or a fiber aggregate made of pulp fibers and the like and a water absorbent polymer (mixed product of water absorbent polymer and fiber material), etc. Can be used. If the continuous absorbent layer 8 comprises a water-absorbing polymer, the content thereof is preferably from ^{5g / m 2 ~200g / m 2} . Pulp basis weight of the continuous absorbent layer 8 is preferably from ^{30g / m 2 ~200g / m 2} , more preferably from ^{50g / m 2 ~100g / m 2} . The thickness T8 of the continuous absorption layer 8 is preferably 0.2 mm to 3.0 mm, and more preferably 0.5 to 2.0 mm. In particular, in the central region B, the thickness T8 of the continuous absorbent layer 8 is such that the ratio (T8 / T40) to the thickness T40 of the absorbent core 40 is 1.0 to 80%, more preferably 10 to 50%. .

Examples of the water-absorbing polymer of the continuous absorbent layer include water-absorbing polymers of various compositions and shapes conventionally used in absorbent articles of absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads. Examples of the resin constituting the water-absorbing polymer include polyacrylic acid soda, (acrylic acid-vinyl alcohol) copolymer, crosslinked polyacrylic acid soda, (starch-acrylic acid) graft polymer, and (isobutylene-maleic anhydride). ) Copolymers and saponified products thereof, potassium polyacrylate, cesium polyacrylate and the like, and these 1 can be used alone or in admixture of two or more.
In addition, the water-absorbing polymer includes an indeterminate type, a block type, a bowl type, a spherical particle aggregation type, a spherical type, and the like due to the difference in shape, and any type can be used. As a fiber assembly, in addition to pulp fibers, for example, chemical fibers such as rayon fibers, polyethylene fibers, polyacrylic fibers, polypropylene fibers, polyethylene terephthalate fibers may be included. Chemical fibers can also be used after being subjected to a hydrophilic treatment. One or two or more water-absorbing polymers and fiber aggregates can be used in combination.

  Next, an incontinence pad according to a fifth embodiment will be described. The incontinence pad of the fifth embodiment is obtained by changing the absorbent core 40 in the pad 1 of the first embodiment to an absorbent core 40D shown in FIG. The absorbent core 40 </ b> D has a large number of small absorbent portions 41 that are dispersed and arranged in the plane direction including the water absorbent polymer in the central region B, and grooves 43 that partition the small absorbent portions 41. However, only a small number of small absorbing portions 41 are arranged in the front region A and the rear region B, and the groove 43 is not formed. In the front region A and the rear region B, only the thin continuous layer 42 is formed at a location where the small absorbing portion 41 is not projected.

  Note that the incontinence pads of the second to fifth embodiments described above have the same configuration as the pad 1 of the first embodiment, and therefore, in addition to the effects described in the embodiments, the first embodiment The same effect as that of the pad 1 is obtained.

The material for forming each part of the incontinence pad described above will be described.
As the top sheet 2, the back sheet 3, and the like, various materials conventionally used for absorbent articles such as incontinence pads can be used without particular limitation. For example, as the surface sheet 2, a liquid-permeable sheet such as a nonwoven fabric or an apertured film can be used. However, the top sheet 2 is preferably an air-through nonwoven fabric or a spunbond nonwoven fabric subjected to a hydrophilic treatment made of a soft material that hits the skin.
As the back sheet 3, for example, a resin film that does not have moisture permeability, a resin film that has micropores and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, a laminate of these and other sheets, and the like are used. Can do. As the waterproof sheet 6, the same sheet as the back sheet 3 can be used. The back sheet 3 may be a laminated sheet in which a liquid-permeable or liquid-permeable non-woven fabric is laminated on the surface of the moisture-permeable or moisture-impermeable resin film on the non-skin contact surface side.

As the core wrap sheet 44 (core wrap sheet 44a), hydrophilic paper (for example, tissue paper) or a water-permeable nonwoven fabric can be used, and hydrophilic paper is particularly preferable. More specifically, it is preferable to use a paper made of fibers containing bulky pulp fibers as the core wrap sheet. For example, a thick hydrophilic cellulose fiber having a fiber roughness of 0.17 to 0.20 mg / m and a thin hydrophilic cellulose fiber having a fiber roughness of 0.13 to 0.16 mg / m are 7/3 to 3/7. By containing in the mass ratio, a core wrap sheet with improved liquid permeability can be produced while suppressing a decrease in strength. The basis weight of the core wrap sheet 44 (particularly the core wrap sheet 44a) is preferably 10 to 40 g / m ² , more preferably 15 to 30 g / m ² . The density of the core wrap sheet 44 is preferably 0.01 to 0.2 g / cm ³ , more preferably 0.015 to 0.1 g / cm ³ .

As an absorptive material contained in the small absorption part 41 (absorbent core 40), a fiber material is mentioned besides a water absorbing polymer.
As the fiber material, natural fibers such as wood pulp, cotton and hemp; synthetic fibers made of synthetic resin such as polyethylene and polypropylene; semi-synthetic fibers such as acetate and rayon can be used without particular limitation. As the fiber material, it is particularly preferable to use pulp fiber from the viewpoint of hydrophilicity. Further, as the high-speed water-absorbing polymer, for example, a porous polymer having a large surface area or a water-absorbing polymer having a small particle size can be used. In addition, when the absorptive core 40 has the thin continuous layer 42, the thin continuous layer 42 may consist of the same absorbent material as the absorbent material which comprises the small absorption part 41, and may differ. For example, the high-speed water-absorbing polymer may be included in the small absorbent portion 41 and contained in the thin continuous layer 42 in a small amount. The high-speed water-absorbing polymer is preferably contained in the small absorption part 41 in an amount of 30 to 100% by mass, more preferably 50 to 100% by mass.

  As mentioned above, although several preferable embodiment was described about the absorbent article of this invention, this invention is not restrict | limited to each embodiment mentioned above at all, and can be changed suitably. For example, in the absorbent core 40, the small absorbent portions 41 do not necessarily have to be arranged in a staggered manner. Specifically, the groove 43 includes a plurality of X-direction linear portions extending along the longitudinal direction (X direction) and a plurality of Y-direction linear portions extending along the width direction (Y direction). The entire groove 43 is formed in a lattice shape. Further, the portion partitioned by these linear grooves 43 may be the small absorption portion 41. In that case, the linear portion in the X direction is formed to extend over the entire length in the longitudinal direction (X direction) of the absorber 4, and the linear portion in the Y direction is the width of the absorber 4, respectively. You may make it extend over the full length of a direction (Y direction).

  In addition to the incontinence pad, the absorbent article of the present invention may be a urine collection pad, a sanitary napkin, a disposable diaper, or the like.

  In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted for each other. For example, the absorbent cores shown in FIGS. 1, 2, 4 to 6 (the absorbent cores of the first and third to fifth embodiments) are all thin continuous layers like the absorbent core 40 shown in FIG. 40 may not be formed.

Hereinafter, although the absorbent article of this invention is further demonstrated using an Example, this invention is not restrict | limited at all by this Example.

[Example 1]
An absorber having the configuration shown in FIG. 3 was prepared. The groove was a through groove penetrating the absorbent core. Further, in the absorbent core, in the entire planar direction, a large number of small absorbent parts were dispersedly arranged in the planar direction, and the small absorbent parts were partitioned into grooves. The basis weight of each of the front region, the central region, and the rear region was the same, the pulp basis weight was 269 g / m ² , and the basis weight of the water-absorbing polymer was 281 g / m ² . Moreover, the area of the surface by the side of the skin contact surface of one small absorption part was 78 mm < ² >. The thickness of the absorbent core (T40) was substantially constant in each region, and was 2.8 mm. Moreover, the space | interval (Lb) between the skin contact surface side surfaces of a small absorption part in planar view was 3 mm in the linear part of a X direction, and the linear part of a Y direction. Table 1 shows the area occupancy Q on the skin contact surface side surface of the small absorbent part, the liquid permeation speed P (liquid permeation time) of the core wrap sheet, and the absorption speed V of the water absorbent polymer. As the core wrap sheet, a single sheet wrapping the entire absorbent core was used. As the core wrap sheet, hydrophilic paper was used, and specifically, paper made of pulp fibers containing 80% bulky pulp fibers was used. The basis weight of the core wrap sheet was 30 g / m ² . As the absorbent material contained in the small absorbent part (absorbent core), a fiber material and a high-speed water-absorbing polymer were used. As the high-speed water-absorbing polymer, amorphous water-absorbing polymer particles obtained by reverse phase suspension polymerization having an average particle diameter of about 300 μm were used. As the fiber material, ordinary fluff pulp was used.

  A sheet in which the absorbent body is sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and gathered elastic members for forming gathers are formed on both side edges in the width direction of the absorbent body. And an incontinence pad for evaluation was obtained. As the surface sheet of the incontinence pad for evaluation, an air-through nonwoven fabric subjected to hydrophilic treatment was used. A moisture-permeable porous film was used as the back sheet.

The area of the skin contact surface side surface 41s of the small absorption part 41 is measured by the following method.
The surface sheet is peeled off in a dry state of the absorbent article. When the surface sheet is bonded to other portions by an adhesive, the surface sheet is peeled off by the following procedure. Spray cold spray to solidify the adhesive. Carefully peel off the topsheet from the rest while the adhesive is solidifying. When the small absorbent portion can be seen through from the core wrap sheet, the dimension of the small absorbent portion is measured from above the core wrap sheet, and the area is calculated. If the small absorbent part cannot be seen through due to high basis weight of the core wrap sheet or the like, carefully peel off the core wrap sheet and directly measure the dimensions of the small absorbent part to obtain the area. Similar to the top sheet, the core wrap sheet can be peeled off using a cold spray.

[Example 2]
An incontinence pad for evaluation was obtained in the same manner as in Example 1 except that the distance (Lb) between the skin contact surface side surfaces of the small absorbent portion in a plan view was 1 mm and the area occupation ratio Q was 75.1%. Obtained. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.
Here, the pulp weight is the total weight of the pulp contained in the absorbent core, and the water absorbent polymer weight is the total weight of the water absorbent polymer contained in the absorbent core.

Example 3
What laminated | stacked the flat-shaped continuous absorption layer (upper layer) of the structure shown in FIG. 5 on the skin contact surface side of the small absorption part of an absorptive core was used. And the sum total of each pulp weight of a continuous absorption layer and an absorptive core becomes equivalent to the pulp weight of the absorptive core of Example 1, and the sum total of each water absorbing polymer weight of a continuous absorptive layer and an absorptive core is Example 1. It adjusted so that it might become equivalent to the water absorbing polymer weight of an absorptive core. Otherwise, an incontinence pad for evaluation was obtained in the same manner as in Example 1.
The continuous absorption layer has the same planar view shape as the absorbent core, and was laminated so as to cover the entire absorbent core. The thickness of the continuous absorption layer was 1.0 mm. As the continuous absorbent layer, a mixed fiber of pulp fibers and water-absorbing polymer having a basis weight of pulp fibers of 90 g / m ² and a basis weight of water-absorbing polymer of 90 g / m ² was used. A normal fluff pulp was used as the pulp fiber of the continuous absorbent layer. As the water-absorbing polymer of the continuous absorption layer, amorphous water-absorbing polymer particles obtained by reverse phase suspension polymerization having an average particle diameter of about 300 μm were used. In addition, the thickness (T40) of the absorptive core was 1.2 mm.

Example 4
As shown in FIG. 4 as an absorbent core, an incontinence pad for evaluation was used in the same manner as in Example 1 except that the basis weight of the central region was higher than the basis weight of the front region and the rear region. Obtained. However, the groove | channel of an absorptive core shall be a penetration groove | channel similarly to Example 1, and the pulp weight of an absorptive core shall be equivalent to the pulp weight of the absorptive core of Example 1, and the water absorbing polymer weight of an absorptive core. Was made equal to the weight of the water-absorbing polymer of the absorbent core of Example 1. The basis weight of the central region, the pulp 440 g / m ^2, was water-absorbing polymer 460 g / m ^2. The basis weight of the front region and the rear region, the pulp 194 g / m ^2, was water-absorbing polymer 203 g / m ^2. In the central region, the thickness of the absorbent core was 4.5 mm. The thickness of the absorbent core in the front region and the rear region was 2.0 mm.

[Comparative Example 1]
The absorptive core was formed in a flat shape having no grooves, and the area occupation ratio Q was set to 100%. Further, the core wrap sheet was carried out except that the liquid permeation speed P (liquid permeation time) was as shown in Table 1, and the water-absorbing polymer contained in the absorbent core was the absorption speed V as shown in Table 1. An incontinence pad for evaluation was obtained in the same manner as in Example 1. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1. The thickness of the absorbent core was 0.8 mm. The basis weight of the absorbent core pulp 150 g / m ^2, was water-absorbing polymer 157 g / m ^2.

[Comparative Example 2]
Comparative Example 1 except that the core wrap sheet has a liquid permeation rate P (liquid permeation time) shown in Table 1 and the water-absorbing polymer contained in the absorbent core has an absorption rate V shown in Table 1. An incontinence pad for evaluation was obtained in the same manner as above.

[Comparative Example 3]
An incontinence pad for evaluation was obtained in the same manner as in Comparative Example 2, except that the water-absorbing polymer contained in the absorbent core was the absorption rate V shown in Table 1.

[Comparative Example 4]
Example 1 except that the core wrap sheet has a liquid permeation rate P (liquid permeation time) as shown in Table 1 and the water-absorbing polymer contained in the absorbent core has an absorption rate V as shown in Table 1. An incontinence pad for evaluation was obtained in the same manner as above. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.

[Comparative Example 5]
An incontinence pad for evaluation was obtained in the same manner as in Example 1 except that the water-absorbing polymer contained in the small absorbent part (absorbent core) had an absorption rate V shown in Table 1. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.

[Comparative Example 6]
The distance (Lb) between the skin contact surface side surfaces of the small absorption part in plan view was 4.5 mm, and the area occupation ratio Q was 43.8%. Further, an incontinence pad for evaluation was obtained in the same manner as in Example 1 except that the core wrap sheet had a liquid permeation speed P (liquid permeation time) as shown in Table 1. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.

[Comparative Example 7]
Incontinence for evaluation in the same manner as in Example 1 except that the space (Lb) between the skin contact surface side surfaces of the small absorption part in a plan view is 4.5 mm and the area occupation ratio Q is 43.8%. I got a pad. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.

[Comparative Example 8]
In plan view, the distance (Lb) between the skin contact surface side surfaces of the small absorbent part is 1 mm and the area occupation ratio Q is 75.1%, and the water-absorbing polymer contained in the small absorbent part (absorbent core) is An incontinence pad for evaluation was obtained in the same manner as in Example 1 except that the absorption rate was as shown in Table 1. The absorbent core pulp weight was made equal to the absorbent core pulp weight of Example 1, and the absorbent core water absorbent polymer weight was made equivalent to the absorbent core weight of Example 1.

[Evaluation]
[Liquid remaining amount of surface sheet]
The amount of remaining liquid on the top sheet was measured as follows.
An incontinence pad was placed horizontally, and artificial urine colored in red (50 g at a rate of 5 g / sec) was injected into the center of the absorber arrangement region on the surface on the surface sheet side. Ten seconds after the injection, two commercially available tissue papers (trade name: Kleenex (Nippon Paper Crecia)), which were diffracted three times vertically and horizontally so as to be 115 mm long and 45 mm wide, were placed. Further, a weight was placed thereon so that the pressure became 0.4 kPa and pressurized for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, and the weight of the liquid absorbed by the paper was measured to obtain the remaining amount of surface liquid (artificial urine).

[Liquid diffusion area of surface sheet]
The liquid diffusion area of the top sheet was measured as follows.
Immediately after the measurement of the remaining amount of liquid on the top sheet, the OHP film is placed on the top sheet, the outline of the part where the top sheet is expanded red is written, and the area can be measured (Image-ProPlus: ) Manufactured by Nippon Roper Co., Ltd.), the image written on the OHP film was taken into a personal computer with a scanner and the liquid diffusion area was determined.

[Dry feeling]
The dry feeling was evaluated as follows.
In the same manner as the method for measuring the amount of remaining liquid on the top sheet, artificial urine was injected into the incontinence pad that was made as a trial, and 10 seconds after the injection, the top sheet was touched with a finger. A sensory test was performed in three stages of ◯ (not feeling wet), △ (feeling slightly wet), and X (strongly feeling wet) as an indicator of dry feeling, and ○ was passed.

  As shown in Table 1, each of Examples 1 to 4 had a smaller liquid diffusion area of the top sheet than Comparative Examples 1 to 8. Moreover, as for Examples 1-4, all were suppressed to the level with few liquid residual amounts of a surface sheet compared with a comparative example (especially comparative examples 1-2, 4-8). Further, each of Examples 1 to 4 had a higher dry feeling than Comparative Examples 1 to 8. By these, in Examples 1-4, compared with Comparative Examples 1-8, it was suggested that a liquid transfers to an absorptive core side from a surface sheet quickly, and is dry and comfortable immediately after excretion. Moreover, by arranging a continuous absorption layer on the absorptive core (block-shaped absorptive core) which has a groove | channel like Example 3, or making higher the basic weight of a center area | region like Example 4. It can be seen that the remaining amount of the liquid on the top sheet is further reduced to provide a dry and comfortable wearing feeling.

The present invention further discloses the following embodiments with respect to the above-described embodiments.
<1> A surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between the two sheets, the absorbent body absorbing An absorbent article having an absorbent core and a core wrap sheet that wraps the absorbent core,
When the absorbent core is divided into three regions of a front region, a central region, and a rear region by dividing the entire length in the longitudinal direction into three equal parts, at least the central region includes a water-absorbing polymer in a planar direction. A large number of small absorbent parts dispersedly arranged, and grooves for partitioning the small absorbent parts,
In the central region, the area occupation ratio of the skin contact surface side surface of the small absorbent portion is 50 to 80%,
The core wrap sheet has a liquid permeation rate of 5 seconds or less at a portion located on the skin contact surface side from the absorbent core, and the water-absorbing polymer has an absorption rate measured according to the DW method of 13 ml / The absorbent article which is g (30 sec) or more.

<2> The absorbent article according to <1>, wherein the absorbent core has a basis weight of the central region higher than a basis weight of the front region and the rear region.
<3> On the skin contact surface side of the small absorbent portion in at least the central region of the absorbent core, a continuous absorption layer whose liquid permeation rate is faster than the liquid permeation rate of the core wrap sheet is laminated. The absorbent article according to <1> or <2>.
<4> On the non-skin contact surface side in at least the central region of the absorbent core, a continuous absorption layer whose liquid permeation rate is faster than the liquid permeation rate of the core wrap sheet is laminated, <1 > Or <2>.

<5> The area occupancy is 50% or more, preferably 70% or less, more preferably 65% or less, and further preferably 60% or less. Any one of <1> to <4> The absorbent article as described.
<6> The distance between the skin contact surface side surfaces of the small absorbent portion in plan view is preferably 1.0 mm or more, more preferably 2.5 mm or more, preferably 10 mm or less, more preferably 4 The absorbent article according to any one of <1> to <5>, which is 5 mm or less.
<7> The absorbent article according to any one of <1> to <6>, wherein the liquid permeation rate of the core wrap sheet is preferably 4 seconds or less, more preferably 3 seconds or less.
<8> The absorbent article according to any one of <1> to <7>, wherein the core wrap sheet is a tissue paper or a water-permeable nonwoven fabric.
<9> The absorbent article according to any one of <1> to <8>, wherein the absorbent core further includes a fiber material.

<10> The fiber material is 1 or 2 of a synthetic fiber made of a synthetic resin of wood pulp, cotton, hemp, polyethylene, a synthetic fiber made of a synthetic resin of polypropylene, an anti-synthetic fiber of acetate, and a semi-synthetic fiber of rayon. The absorbent article as described in <9> above.
<11> The absorbent article according to any one of <1> to <10>, wherein the water-absorbing polymer has an absorption rate measured according to a DW method of 14 ml / g (30 sec) or more.
<12> The absorbent article according to any one of <1> to <11>, wherein the water-absorbing polymer has an absorption rate measured according to a DW method of 50 ml / g (30 sec) or less.
<13> The absorbent core according to any one of <9> to <12>, wherein a basis weight of the fiber material in the central region is higher than a basis weight of the fiber material in the front region and the rear region. 2. The absorbent article according to 1.
<14> The absorbent core according to <2> to <13>, wherein the basis weight of the water absorbent polymer in the central region is higher than the basis weight of the water absorbent polymer in the front region and the rear region. The absorbent article of any one.
<15> The ratio of the basis weight of the fiber material in the central region to the basis weight of the fiber material in the front region and the rear region is preferably 1.2 or more, more preferably 1.5 or more, The absorbent article according to any one of <9> to <14>, preferably 3.0 or less, more preferably 2.5 or less.

<16> The ratio of the basis weight of the water-absorbing polymer in the central region to the basis weight of the water-absorbing polymer in the front region and the rear region is preferably 1.2 or more, more preferably 1.5 or more. The absorbent article according to any one of <2> to <15>, which is preferably 3.0 or less, more preferably 2.5 or less.
<17> The absorbent core according to <1> to <16>, wherein the small absorbent portion in the central region is formed to be bulkier than the small absorbent portions in the front region and the rear region. The absorbent article of any one.
<18> The absorbent article according to <3> or <4>, wherein the continuous absorbent layer is made of a fiber material.
<19> The absorbent article according to <18>, wherein the continuous absorbent layer further includes a water-absorbing polymer.

<20> The absorption according to <18> or <19>, wherein the liquid permeation rate of the continuous absorption layer is 0.3 seconds or less, preferably 4 seconds or less, more preferably 1.0 seconds or less. Sex goods.
<21> The absorbent article according to any one of <1> to <20>, wherein the article includes a pair of three-dimensional gathers that stand on the wearer side on both sides.
<22> The absorbent article according to any one of <1> to <21>, wherein the article is a pad used by being fixed to a wearer's clothing.
<23> The absorbent article according to any one of <1> to <22>, wherein the article has a fixing unit that can be fixed to a wearer's clothing on a clothing side surface of a back sheet.

1 Incontinence pad (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 8 Continuous absorbent layer 40 Absorbent core A Front region B Center region C Rear regions 44, 44a, 44b Core wrap sheets 41, 41a-41c Small absorbent portion 43 of the absorber Groove

Claims (4)

A front sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between both sheets, the absorbent body comprising an absorbent core and An absorbent article having a core wrap sheet for wrapping the absorbent core,
When the absorbent core is divided into three regions of a front region, a central region, and a rear region by dividing the entire length in the longitudinal direction into three equal parts, at least the central region includes a water-absorbing polymer in a planar direction. A large number of small absorbent parts dispersedly arranged, and grooves for partitioning the small absorbent parts,
In the central region, the area occupation ratio of the skin contact surface side surface of the small absorbent portion is 50 to 80%,
The core wrap sheet has a liquid permeation rate of 5 seconds or less at a portion located on the skin contact surface side from the absorbent core, and the water-absorbing polymer has an absorption rate measured according to the DW method of 13 ml / The absorbent article which is g (30 sec) or more.   The absorbent article according to claim 1, wherein the absorbent core has a basis weight of the central region higher than a basis weight of the front region and the rear region.   The continuous absorption layer whose liquid permeation rate is faster than the liquid permeation rate of the core wrap sheet is laminated on the skin contact surface side of the small absorption part in at least the central region of the absorbent core. The absorbent article according to 1 or 2.   The continuous absorption layer whose liquid-permeation rate is faster than the liquid-permeation rate of the said core wrap sheet is laminated | stacked on the non-skin contact surface side in the said center area | region of the said absorptive core at least. Absorbent articles.

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