JP7111445B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles .

Conventionally, absorbent articles such as disposable diapers have been used. In such absorbent articles, by adopting a structure such as arranging a high-absorbent material at a high density in the part that receives urine, etc. from the wearer, the absorption amount is improved and leakage is suppressed. there is Moreover, Patent Document 1 discloses an absorbent article in which the amount of superabsorbent material is different between the right and left sides on the premise that it is used in the lateral recumbent position. In the absorbent article, leakage is suppressed while eliminating waste of the absorbent body.

Patent Literature 2 proposes an absorbent pad having a first superabsorbent material and a second superabsorbent material having a longer reaction time to liquids than the first superabsorbent material. The core of the absorbent pad is divided into a plurality of cells, with cells containing a first superabsorbent material and cells containing first and second superabsorbent materials.

Japanese Patent Application Laid-Open No. 2003-180721 Japanese Patent Publication No. 2016-515459

By the way, in the absorbent article of Patent Document 1, since the sleeping posture of the wearer is determined, side leakage occurs when the wearer rolls over or changes the sleeping posture. In addition, in the absorbent pad of Patent Document 2, the cells containing the first and second superabsorbent materials are arranged near the center in the longitudinal direction, and the cells containing the first superabsorbent material are arranged near both ends in the longitudinal direction. However, this absorbent pad does not employ a structure for suppressing side leakage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel structure for suppressing side leakage.

The invention according to claim 1 is an absorbent article that receives excrement from a wearer, and includes a sheet member for an absorbent article and a top sheet that covers a main surface of the sheet member for an absorbent article on the wearer side. and a back sheet covering the other main surface of the sheet member for absorbent articles, wherein the sheet member for absorbent articles is joined to a first sheet extending in the longitudinal direction and the first sheet. a second sheet forming a stack of sheets by a first superabsorbent material secured between said first sheet and said second sheet; and secured between said first sheet and said second sheet and a second superabsorbent material different from the first superabsorbent material, and on each of both sides of the sheet stack, side absorbent regions containing at least the second superabsorbent material are provided in the longitudinal direction. and a central absorbent area containing at least the first superabsorbent material is provided along the longitudinal direction between the two side portions of the sheet laminate to constitute the side absorbent areas. The absorption capacity or absorption speed of the superabsorbent material is greater than that of the superabsorbent material that constitutes the central absorbent area, and in the sheet stack, the portion of the side absorbent area on one of the side areas, the side area The other part of the side absorbent area and the part of the central absorbent area are separately produced as divided absorbent sheets, and the divided absorbent sheet for the one side absorbent area and the central absorbent area and the other divided absorbent sheet for the side absorbent area are arranged in the width direction perpendicular to the longitudinal direction.

The invention according to claim 2 is the absorbent article according to claim 1, wherein the absorption capacity and absorption rate of the superabsorbent material constituting the side absorbent regions constitute the central absorbent region. Larger than super absorbent material.

ADVANTAGE OF THE INVENTION According to this invention, the side leakage in an absorbent article can be suppressed.

1 is a plan view showing an absorbent article; FIG. 1 is a cross-sectional view showing an absorbent article; FIG. It is a top view which shows an absorption core. 1 is a cross-sectional view showing an absorbent article; FIG. 1 is a cross-sectional view showing an absorbent article; FIG. FIG. 10 is a diagram showing another example of an absorbent article; FIG. 10 is a diagram showing another example of an absorbent article; FIG. 10 is a diagram showing another example of an absorbent article; FIG. 10 is a diagram showing another example of an absorbent core; FIG. 10 is a diagram showing another example of an absorbent core;

FIG. 1 is a plan view showing an absorbent article 1 in an unfolded state. The absorbent article 1 is an auxiliary absorbent pad that is attached to the inside (that is, the wearer's side) of an exterior article such as a disposable diaper worn by the wearer and receives excrement such as urine from the wearer. In FIG. 1, the absorbent article 1 is drawn with the side that contacts the wearer when worn facing forward.

FIG. 2 is a cross-sectional view of the absorbent article 1 cut along a plane perpendicular to the longitudinal direction (that is, the vertical direction in FIG. 1) at the position II-II shown in FIG. As shown in FIGS. 1 and 2, the absorbent article 1 includes a substantially sheet-like main body 2 and both sides of the main body 2 (that is, both sides in the width direction perpendicular to the longitudinal direction). A pair of side seats 3 are provided over substantially the entire length of the main body 2 in the longitudinal direction.

As shown in FIGS. 1 and 2 , the main body 2 includes a liquid-permeable top sheet 21 , a water-repellent or liquid-impermeable back sheet 23 , and disposed between the top sheet 21 and the back sheet 23 . and a substantially sheet-like absorbent core 22 . The absorbent core 22 is an absorbent article sheet member used in the absorbent article 1 . In FIG. 2 , each component of the absorbent article 1 is drawn separately in the thickness direction for convenience of illustration. In addition, in FIG. 1, the contour of the absorbent core 22 is drawn with a thick dashed line for easy understanding of the drawing. As shown in FIG. 1, each of the absorbent core 22 and the main body 2 has a substantially rectangular shape elongated in the longitudinal direction in plan view. The body portion 2 is slightly larger than the absorbent core 22 , and the entirety of the absorbent core 22 is positioned inside the outer peripheral edge of the body portion 2 .

The length in the longitudinal direction and width in the width direction (hereinafter simply referred to as “length” and “width”) of the top sheet 21 and the back sheet 23 are greater than the length and width of the absorbent core 22 . As shown in FIG. 2, the top sheet 21 covers the main surface of the absorbent core 22 facing the wearer. The backsheet 23 covers the other major surface of the absorbent core 22, ie, the major surface opposite the wearer. The top sheet 21 is joined to the back sheet 23 around the absorbent core 22 via a hot melt adhesive or the like.

As shown in FIG. 2, the absorbent core 22 comprises a liquid-permeable first sheet 221, a liquid-permeable second sheet 222, and first and second superabsorbent materials 223a, 223b. The first sheet 221 and the second sheet 222 are superimposed on each other and joined with a hot-melt adhesive or the like. As a result, a sheet laminate 224 in which a plurality of sheet members are laminated is formed. The first and second superabsorbent materials 223a, 223b are of different types. Each of the first and second superabsorbent materials 223a, 223b is disposed between the first sheet 221 and the second sheet 222 and secured to one or both by hot melt adhesive or the like. In FIG. 2, the first superabsorbent material 223a is indicated by open circles and the second superabsorbent material 223b is indicated by black circles. The same applies to other drawings showing cross sections of the absorbent article 1. FIG. Details of the structure of the absorbent core 22 will be described later.

The top sheet 21 is a liquid-permeable sheet member, which quickly captures the moisture of the wearer's excrement and transfers it to the absorbent core 22 . The absorbent core 22 absorbs moisture permeating through the top sheet 21 and quickly fixes it. The back sheet 23 prevents water and the like of the excrement reaching the back sheet 23 from seeping out of the main body 2 .

As shown in FIGS. 1 and 2, each side seat 3 includes a side seat main body 31 and side wall elastic members 32 which are joined to the side seat main body 31 with a hot-melt adhesive or the like and extend in the longitudinal direction. As shown in FIG. 2, the side seat main body 31 is folded in two along a folding line 39 extending over the entire length in the longitudinal direction. In the side seat main body 31, the band-like portion on one side of the bending line 39 is called "side wall fixing portion 33", and the band-like portion on the other side of the bending line 39 is called "side wall portion 34".

The side wall fixing portion 33 is joined to the wearer side of the body portion 2 using a hot-melt adhesive or the like over approximately the entire length in the longitudinal direction in the vicinity of the side edge of the body portion 2 . The side wall portion 34 is a portion that continues from the side wall fixing portion 33 at the bend line 39 and extends over the entire length of the body portion 2 in the longitudinal direction on both sides of the body portion 2 . The side wall portions 34 are overlapped on the main body portion 2 at both ends in the longitudinal direction and fixed with a hot-melt adhesive or the like. A side wall elastic member 32 is joined to the free end of the side wall portion 34 . By contracting the side wall elastic member 32, the longitudinal central portion of the side wall 34 rises from the main body 2 toward the wearer and forms a pair of three-dimensional gathers that abut near the roots of the wearer's legs. . Thus, in the absorbent article 1, leakage of urine or the like from around the legs is suppressed.

Polyolefin-based, rubber-based, and vinyl acetate-based adhesives are used as the above-mentioned hot-melt adhesives. The bonding between the top sheet 21 and the back sheet 23, the bonding between the side sheet 3 and the body portion 2, and the bonding between the side wall portion 34 and the body portion 2 may be performed by thermal fusion bonding, ultrasonic bonding, or the like. good.

As the top sheet 21, for example, a liquid-permeable nonwoven fabric formed of hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surface is hydrophilically treated with a surfactant is used. The nonwoven fabric is, for example, a point-bonded nonwoven fabric, an air-through nonwoven fabric, or a spunbonded nonwoven fabric. As the top sheet 21, a nonwoven fabric (for example, a spunlace nonwoven fabric) formed of hydrophilic fibers such as cellulose, rayon, and cotton may be used.

As the first sheet 221 and the second sheet 222 of the absorbent core 22, for example, similar to the top sheet 21, hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surface is hydrophilically treated with a surfactant are used. A liquid-permeable nonwoven fabric formed by The nonwoven fabric is, for example, a point-bonded nonwoven fabric, an air-through nonwoven fabric, or a spunbonded nonwoven fabric. Also, as the first sheet 221 and the second sheet 222, a nonwoven fabric (for example, a spunlace nonwoven fabric) formed of hydrophilic fibers such as cellulose, rayon, and cotton may be used. A tissue, a plastic film having a plurality of openings, or the like may be used as the first sheet 221 and the second sheet 222 . As the first and second superabsorbent materials 223a and 223b, for example, granular superabsorbent polymer (SAP (Super Absorbent Polymer)) or fibrous superabsorbent fiber (SAF (Super Absorbent Fiber)) is used. used.

As the backsheet 23, a water-repellent or liquid-impermeable nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or an SMS (spunbond-meltblown-spunbond) nonwoven fabric) made of hydrophobic fibers, or a water-repellent or liquid-impermeable nonwoven fabric A liquid-impermeable plastic film or a laminated sheet obtained by laminating these nonwoven fabrics and a plastic film is used. From the viewpoint of preventing stuffiness of the absorbent article 1 and improving wearer's comfort, the plastic film used for the back sheet 23 preferably has moisture permeability (breathability).

As the side sheet main body 31, a water-repellent or liquid-impermeable nonwoven fabric (for example, spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric, etc.) made of hydrophobic fibers is used. As the side wall elastic member 32, for example, polyurethane thread, strip-shaped polyurethane film, thread-shaped or strip-shaped natural rubber, or the like is used. In the absorbent article 1 shown in FIG. 1, polyurethane thread is used as the elastic member.

FIG. 3 is a plan view showing the absorbent core 22. FIG. As described above, the absorbent core 22 has a substantially rectangular shape elongated in the longitudinal direction, and both the first sheet 221 and the second sheet 222 are elongated in the longitudinal direction. In the absorbent core 22, a plurality of material existing regions 25a, 25b and a plurality of material non-existing regions 26 are provided. The plurality of material-existing regions 25a and 25b each have a belt shape extending substantially parallel to the longitudinal direction and are arranged while being spaced apart from each other in the width direction. That is, the absorbent core 22 is provided with a plurality of material existing regions 25a and 25b arranged in stripes extending in the longitudinal direction. In the example of FIG. 3, the widths of the plurality of material existing regions 25a and 25b are approximately equal to each other.

Among the plurality of material existing regions 25a and 25b, in the two material existing regions 25b respectively arranged on both sides of the sheet laminate 224 (that is, both sides of the absorbent core 22), the second superabsorbent material 223b It is fixed between the first sheet 221 and the second sheet 222 (see FIG. 2). In other words, the second superabsorbent material 223b is fixed in the material existing region 25b. A first superabsorbent material 223a is fixed to one material existing area 25a arranged between two material existing areas 25b, that is, between both sides of the sheet stack 224. As shown in FIG. In the following description, the material existing regions 25b are called "side absorbent regions 25b", and the material existing regions 25a are called "central absorbent regions 25a". In FIG. 3, the side absorbent regions 25b and the central absorbent region 25a are marked with different types of diagonal lines.

The basis weight of the superabsorbent material in the side absorbent regions 25b is, for example, 50% or more and 150% or less, preferably 75% or more and 125% or less, of the basis weight of the superabsorbent material in the central absorbent region 25a. is. As a result, a structure in which the high-absorbent material is densely arranged only in the central portion or only on both sides (a structure in which the thickness of the absorbent core 22 is partially increased) is avoided, thereby improving the wearing comfort of the wearer. can be improved. In the absorbent core 22 of FIG. 3, the side absorbent regions 25b do not contain the first superabsorbent material 223a and the central absorbent region 25a does not contain the second superabsorbent material 223b.

The absorption capacity and absorption rate of the second superabsorbent material 223b are greater than those of the first superabsorbent material 223a. That is, the absorption capacity and absorption rate of the superabsorbent material forming the side absorbent regions 25b are greater than those of the superabsorbent material forming the central absorbent region 25a. Absorption capacity in the present embodiment is the amount of liquid that a unit mass of superabsorbent material can absorb in a predetermined time, and absorption rate is the amount of liquid absorbed by a given amount of superabsorbent material. A value based on the reciprocal of the time it takes to

The side absorbent regions 25b are placed in the first position within a range in which the absorption capacity and absorption rate of the superabsorbent material forming the side absorbent regions 25b are higher than those of the superabsorbent material forming the central absorbent region 25a. One superabsorbent material 223a may be included and the central absorbent region 25a may include a second superabsorbent material 223b. In other words, the side absorbent regions 25b include at least the second superabsorbent material 223b and the central absorbent region 25a includes at least the first superabsorbent material 223a. Methods for measuring absorption capacity and absorption rate will be described later.

The multiple non-material regions 26 are regions of the absorbent core 22 excluding the side absorbent regions 25b and the central absorbent region 25a. The plurality of material non-existence regions 26 are strip-shaped, each extending along the longitudinal direction. For example, the width of each material free region 26 is less than the width of the side absorbent regions 25b and central absorbent region 25a. In the example of FIG. 3, the widths of the multiple non-material regions 26 are equal to each other. The plurality of non-material regions 26 and the plurality of material-existing regions 25a, 25b (that is, the side absorbent regions 25b and the central absorbent region 25a) are alternately arranged in the width direction.

In each material-free region 26 , no superabsorbent material is present between the first sheet 221 and the second sheet 222 . In the material non-existence region 26, the first sheet 221 and the second sheet 222 are preferably joined together by joining without using an adhesive, such as heat-sealing joining or joining by embossing. In the material absent region 26, the first sheet 221 and the second sheet 222 may be partially unbonded. The material-free regions 26 contain little superabsorbent material, i.e. regions with a lower density of the first and second superabsorbent materials 223a, 223b than the side absorbent regions 25b and the central absorbent region 25a (i.e. , material low density regions).

When excrement such as urine is excreted by the wearer of the absorbent article 1, water in the excrement adheres to the central absorbent area 25a in principle. Since the high-absorbency material (mainly the first high-absorbency material 223a) constituting the central absorbent region 25a has a relatively low absorption capacity and absorption rate, most of the water in the excrement is immediately absorbed in the central absorbent region 25a. spreads to the surroundings. Moisture is further diffused in the non-material areas 26 on both sides of the central absorbent area 25a and reaches the side absorbent areas 25b. Since the high-absorbency material (mainly the second high-absorbency material 223b) forming the side absorbent regions 25b has relatively high absorption capacity and absorption rate, as shown in FIG. material absorbs moisture in a short time and swells. Due to the swollen superabsorbent material, the absorbent core 22 forms thicker portions (hereinafter referred to as “swollen portions”) on both side portions (side absorbent regions 25b) of the sheet laminate 224 than other portions. be. As described above, the side absorbent regions 25b extend over substantially the entire length of the absorbent core 22, and if the excrement contains a large amount of water, the swollen portion is formed over a wide range in the lengthwise direction.

Further, when the absorbent article 1 is excreted a plurality of times by the wearer, the swollen portion functions as a weir so that the water content of the excrement moves outward in the width direction (outward from the side absorbent regions 25b). Movement is blocked. That is, the moisture stays between the two side absorbent regions 25b in the width direction. The moisture is slowly absorbed by the superabsorbent material in the central absorbent area 25a, causing the superabsorbent material to swell, as shown in FIG. After swelling of the superabsorbent material of the central absorbent region 25a, longitudinally extending grooves are formed in the material free regions 26 between the side absorbent regions 25b and the central absorbent region 25a. Therefore, the water content of excrement is efficiently diffused in the longitudinal direction through the grooves, and the central absorbent area 25a and the side absorbent areas 25b are efficiently utilized over a wide range in the longitudinal direction.

As described above, in the absorbent article 1, the side absorbent regions 25b are provided along the longitudinal direction on each of the two side portions of the absorbent core 22, and the central absorbent region 25a is provided between the two side portions. The absorption capacity and absorption speed of the superabsorbent material forming the side absorbent regions 25b are greater than those of the superabsorbent material forming the central absorbent region 25a, so that the lateral absorbent regions 25b quickly absorb water from the excrement. . As a result, a weir (swollen portion) of the swollen superabsorbent material is formed in the side absorbent region 25b, and the movement of the excrement to the outside in the width direction is blocked. As a result, it is possible to suppress lateral leakage, in which excrement received by the absorbent article 1 leaks from the side portion of the absorbent core 22 to an external region where the absorbent core 22 does not exist. The water content of the excrement remaining on the absorbent core 22 is absorbed by the highly absorbent material in the central absorbent area 25a.

Similarly to the side absorbent regions 25b, the central absorbent region 25a is provided in a band shape along the longitudinal direction, and a band-shaped material non-existing region 26 is provided between each side absorbent region 25b and the central absorbent region 25a. be done. As a result, water in excrement can be rapidly diffused in the longitudinal direction, and many of the first and second superabsorbent materials 223a, 223b of the absorbent core 22 can be efficiently utilized for water absorption. (The same is true if a material low density region is provided). Furthermore, even after the superabsorbent material swells in the central portion in the longitudinal direction, the grooves formed between the side absorbent regions 25b and the central absorbent region 25a allow the excrement to spread more rapidly in the longitudinal direction. can.

Here, methods for measuring the absorption capacity and absorption rate of superabsorbent materials will be described. Absorption capacity is measured, for example, by a measuring method (tea bag method) based on JIS K7223. In the measurement method, a predetermined amount of deionized water or saline is placed in a beaker as a test liquid. Subsequently, the mass a [g] of the sample of the superabsorbent material is measured, the sample is placed in a tea bag formed of a nylon fabric of a predetermined size, and the tea bag is immersed in the test liquid. After a predetermined time has passed, the tea bag is taken out and drained, and the mass b [g] after draining is measured. Also, the tea bag without the sample is immersed in the test liquid for a predetermined time, and the mass c [g] after draining is measured in the same manner as above. Then, the absorption capacity (water absorption amount) W is obtained by (W=(b−c−a)/a). In the absorbent article 1, for example, the absorbency W of the superabsorbent material forming the central absorbent region 25a is 50 [g/g] or less, and the absorbency W of the superabsorbent material forming the side absorbent regions 25b is 50 [g/g] or less. W is 51 [g/g] or more.

The absorption rate is measured, for example, by a measuring method (vortex method) conforming to JIS K7224. In the measurement method, 50 [g] of deionized water or saline is used as a test liquid, and the test liquid and a stirrer tip (diameter at the center part is 8 [mm], diameter at both ends is 7 [mm], length is 30 [mm] and coated with fluororesin) is placed in a beaker, and the beaker is placed on a magnetic stirrer. Adjust the speed of the magnetic stirrer to 600±60 rpm and ensure that the test liquid produces a stable vortex. Also, 0.50 [g] of a sample of the superabsorbent material (2.00 [g] when the test liquid is saline) is evenly placed near the inner wall surface, and then the timer is started. The end point of the test is the time when the stirrer tip is covered with the test liquid (for example, the time when the vortex disappears and the liquid surface becomes flat), and the time t is obtained as the time related to the absorption rate. The absorption rate is a value based on the reciprocal of the time t related to the absorption rate, and the shorter the time t related to the absorption rate, the higher the absorption rate. In the absorbent article 1, for example, the time t related to the absorption speed of the superabsorbent material forming the central absorbent region 25a is 41 seconds or more, and the absorption speed of the superabsorbent material forming the side absorbent regions 25b is The relevant time t is 40 seconds or less.

As described above, both the absorption capacity and the absorption rate are indicators of the water absorption performance of a superabsorbent material, and often have a certain degree of correlation between them. Therefore, in the absorbent core 22 of FIG. 2, the absorption capacity and absorption speed of (the superabsorbent material of) the side absorbent regions 25b are higher than the absorption capacity and absorption speed of (the superabsorbent material of) the central absorbent region 25a. . Depending on the type of superabsorbent material used in the absorbent core 22, the absorption capacity of the side absorbent regions 25b is approximately the same as that of the central absorbent region 25a, and only the absorption rate of the side absorbent regions 25b is greater than that of the central absorbent region 25a. may The time required for the absorption speed of the side absorbent regions 25b is preferably 0.95 times or less, more preferably 0.90 times or less, of the time required for the absorption speed of the central absorbent region 25a. At this time, the absorbency of the side absorbent regions 25b is preferably greater than 0.95 times the absorbency of the central absorbent region 25a.

Similarly, the absorption speed of the side absorbent regions 25b may be substantially the same as that of the central absorbent region 25a, and only the absorption capacity of the side absorbent regions 25b may be greater than that of the central absorbent region 25a. The absorbency of the side absorbent regions 25b is preferably 1.05 times or more, more preferably 1.10 times or more, that of the central absorbent region 25a. At this time, the time required for the absorption speed of the side absorbent regions 25b is preferably less than 1.05 times the time required for the absorption speed of the central absorbent region 25a. As described above, in the absorbent core 22, it is important that the absorption capacity or absorption speed of the side absorbent regions 25b is higher than that of the central absorbent region 25a.

FIG. 6 is a diagram showing another example of the absorbent article 1. FIG. In the absorbent article 1 of FIG. 6, the absorbent core 22 further comprises a fiber assembly layer 24 in addition to the first sheet 221, the second sheet 222, and the first and second superabsorbent materials 223a, 223b. The fiber assembly layer 24 is disposed between the second sheet 222 and the backsheet 23 and joined to one or both. For example, the size of the fiber assembly layer 24 in the width direction and the length direction is larger than the sheet laminate 224 . The fiber aggregate layer 24 is formed of, for example, regenerated hydrophilic fibers such as cellulose, rayon, and cotton, synthetic fibers, pulp fibers, and the like. The fiber assembly layer 24 may contain a small amount of superabsorbent material. Typically, the fiber assembly layer 24 is wrapped with tissue paper, liquid-permeable nonwoven fabric, or the like.

In the absorbent article 1 of FIG. 6, when excretion such as urine is excreted by the wearer, part of the moisture reaching the absorbent core 22 is transferred to the fiber assembly layer 24 via the material non-existing region 26. and is absorbed by the fiber assembly layer 24 . In the absorbent article 1, the fiber assembly layer 24 is provided under the first and second superabsorbent materials 223a, 223b, so that the absorption capacity of the absorbent core 22 can be further increased.

As shown in FIG. 7, the first and second superabsorbent materials 223a, 223b may be adhered (fixed) directly onto the fiber assembly layer 24. FIG. In this case, the fiber assembly layer 24 is wrapped by the first sheet 221 and the second sheet 222 together with the first and second superabsorbent materials 223a, 223b.

Further, as shown in FIG. 8, the side absorbent regions 25b and the central absorbent region 25a of the absorbent core 22 are separately manufactured and arranged in the width direction when the absorbent article 1 is manufactured. good too. Specifically, the first superabsorbent material 223a is placed between the strip-shaped first split sheet 2211 and the strip-shaped second split sheet 2221 to form the split absorbent sheet for the central absorbent region 25a. A second superabsorbent material 223b is placed between the first split sheet 2211 and the second split sheet 2221 to form split absorbent sheets for the side absorbent regions 25b. Then, on the fiber assembly layer 24, the divided absorbent sheets for the side absorbent regions 25b, the divided absorbent sheets for the central absorbent region 25a, and the divided absorbent sheets for the side absorbent regions 25b are arranged in order in the width direction. Thus, the absorbent core 22 shown in FIG. 8 is produced. These divided absorbent sheets are joined to one or both of the top sheet 21 and the fiber assembly layer 24 .

In the absorbent core 22 of FIG. 8 , a set of the plurality of first divided sheets 2211 constitutes the first sheet 221 and a set of the plurality of second divided sheets 2221 constitutes the second sheet 222 . Depending on the manufacturing method of the absorbent core 22 , for example, the second sheet 222 may be a continuous single sheet, and the first sheet 221 may be a set of a plurality of first divided sheets 2211 . In this case, the plurality of first divided sheets 2211 may partially overlap each other.

Various modifications of the absorbent article 1 and the absorbent core 22 are possible.

The number and shape of the side absorbent regions 25b and the central absorbent region 25a provided in the absorbent core 22 may vary. For example, as shown in FIG. 9, on each side of the absorbent core 22, a plurality of strip-shaped divided absorbent regions 251b may be arranged in the longitudinal direction. In the absorbent core 22, the swelling of the high-absorbent material of the split absorbent regions 251b fills the gaps between the two split absorbent regions 251b adjacent to each other in the longitudinal direction, and the two split absorbent regions 251b are substantially continuous. A swollen portion is formed. That is, a set of a plurality of divided absorbent regions 251b arranged in the longitudinal direction constitute the side absorbent regions 25b. This makes it possible to suppress side leakage. In addition, in the absorbent core 22 of FIG. 9, a large number of substantially circular divided absorbent regions 251a are arranged with a gap between both side portions, and a material absent region 26 is provided around each divided absorbent region 251a. be provided. This makes it possible to efficiently diffuse the water content of the excrement. In the absorbent core 22 of FIG. 9, a central absorbent region 25a is formed by a set of a plurality of divided absorbent regions 251a.

As shown in FIG. 10, at each longitudinal end of the absorbent core 22, two side absorbent regions 25b may be connected to each other by a connecting portion 25c. The connecting portion 25c is provided along the width direction, and is made of the same high-absorbency material as the side absorbent regions 25b, for example. In the absorbent core 22 of FIG. 10, one central absorbent region 25a is provided between two side absorbent regions 25b and between two connecting portions 25c. In the absorbent core 22 of FIG. 10, the swelling of the high-absorbent material of the side absorbent regions 25b and the connecting portions 25c causes not only side leakage but also excrement leakage from the ends of the absorbent core 22 to the external region. Vertical leakage can also be suppressed.

Pulp or the like may be mixed with the first and second superabsorbent materials 223a, 223b in the side absorbent regions 25b and the central absorbent region 25a. In this case, the pulp or the like is preferably mixed in such a proportion that the superabsorbent materials 223a and 223b can be regarded as the main material (for example, the weight ratio of the superabsorbent materials 223a and 223b is 50% or more).

As previously mentioned, the side absorbent regions 25b may contain a first superabsorbent material 223a with a low absorption capacity or absorption rate, and the central absorbent region 25a may contain a second superabsorbent material 223a with a high absorption capacity or absorption rate. Material 223b may also be included. In this case, in the side absorbent regions 25b, the density of the second superabsorbent material 223b is higher than that of the first superabsorbent material 223a, and in the central absorbent region 25a, the density of the first superabsorbent material 223a is higher than that of the first superabsorbent material 223a. It is made higher than the density of the second superabsorbent material 223b. This makes it possible to easily increase the absorption capacity or absorption speed of the superabsorbent material forming the side absorbent regions 25b than the superabsorbent material forming the central absorbent region 25a. The absorbent core 22 may contain three or more superabsorbent materials.

Depending on the design of the absorbent core 22, the material free regions 26 between the side absorbent regions 25b and the central absorbent region 25a may be omitted.

The absorbent article 1 and the absorbent core 22 described above are not necessarily limited to a substantially rectangular shape, and may be, for example, a substantially hourglass shape in which the width of both ends in the longitudinal direction is greater than the width of the central portion. Also, the side sheet 3 may be omitted from the absorbent article 1 .

The absorbent core 22 described above may be used in absorbent articles other than auxiliary absorbent pads, such as pants-type and tape-type disposable diapers.

The configurations in the above embodiment and each modified example may be combined as appropriate as long as they do not contradict each other.

1 Absorbent Article 21 Top Sheet 22 Absorbent Core 23 Back Sheet 25a Central Absorbent Area 25b Side Absorbent Area 26 No Material Area 221 First Sheet 222 Second Sheet 223a First Super Absorbent Material 223b Second Super Absorbent Material 224 sheet laminate

Claims (2)

An absorbent article that receives excrement from a wearer,
a sheet member for an absorbent article;
a top sheet that covers the wearer-side main surface of the absorbent article sheet member;
a back sheet covering the other main surface of the absorbent article sheet member;
with
The absorbent article sheet member is
a longitudinally extending first sheet;
a second sheet bonded to the first sheet to form a sheet laminate;
a first superabsorbent material secured between the first sheet and the second sheet;
a second superabsorbent material fixed between the first sheet and the second sheet and different from the first superabsorbent material;
with
A side absorbent region containing at least the second superabsorbent material is provided along the longitudinal direction on each of both side portions of the sheet stack,
A central absorbent region containing at least the first superabsorbent material is provided along the longitudinal direction between the side portions of the sheet laminate,
The absorption capacity or absorption rate of the superabsorbent material that constitutes the side absorbent regions is greater than that of the superabsorbent material that constitutes the central absorbent region,
In the sheet laminate, one of the side absorbent regions on both sides, the other of the side absorbent regions on both sides, and the central absorbent region are individually divided into divided absorbent sheets. made,
The divided absorbent sheet for one of the side absorbent regions, the divided absorbent sheet for the central absorbent region, and the divided absorbent sheet for the other side absorbent region are aligned in the width direction perpendicular to the longitudinal direction. An absorbent article characterized by being arranged in a row. The absorbent article according to claim 1,
An absorbent article, wherein the superabsorbent material forming the side absorbent regions has a higher absorption capacity and absorption rate than the superabsorbent material forming the central absorbent region.

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