CN114040737B

CN114040737B - Absorbent article

Info

Publication number: CN114040737B
Application number: CN202080046274.8A
Authority: CN
Inventors: 松田昂平; 川口宏子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-06-28
Filing date: 2020-05-11
Publication date: 2023-04-21
Anticipated expiration: 2040-05-11
Also published as: CN114040737A; JP7351657B2; JP2021007516A; WO2020261780A1

Abstract

The invention provides an absorbent article comprising an absorbent core and a core wrap covering the skin side and the non-skin side of the absorbent core, the absorbent core is provided with a sheet member having a sheet member formed on at least one of the skin surface side and the non-skin surface side thereof ^* a ^* b ^* In color system at L ^* A has a value of 40 to 100 ^* A value of-12 or more and 3 or less, b ^* The absorbent core is an aggregate of a superabsorbent polymer and pulp fibers, the superabsorbent polymer is disposed on a skin side of the absorbent core, a junction between the absorbent core and the core-in-sheet is disposed on the skin side of the absorbent core, and a compartment surrounded by the junction is disposed on at least a part of the skin side of the absorbent core, thereby dividing a region in which the superabsorbent polymer is disposed.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

In an environment of high temperature and high humidity, a superabsorbent polymer (SAP) used in an absorbent article such as a diaper may be changed to yellow or brown due to oxidation, and the appearance of the absorbent article may be deteriorated. Such a phenomenon is particularly likely to occur in subtropical or tropical regions such as southeast asia. Therefore, a technology has been proposed to maintain a good appearance of an absorbent article by suppressing discoloration of a superabsorbent polymer using an antioxidant or the like.

For example, patent document 1 describes a technique using an acrylic acid or hydroquinone (quinhydrone) inhibitor having a small hydroquinone content, patent document 2 describes a technique using a reducing compound and a specific acid (salt), and patent document 3 describes a technique using a sulfinic acid derivative.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 11-322846

Patent document 2: japanese patent laid-open No. 2003-52742

Patent document 3: japanese patent application laid-open No. 2006-521431

Disclosure of Invention

Technical problem to be solved by the invention

The invention provides an absorbent article comprising an absorbent core and a core wrap covering the skin side and the non-skin side of the absorbent core, wherein the absorbent article comprises a core wrap provided on at least one of the skin side and the non-skin side of the absorbent core, wherein the core wrap comprises a core wrap provided on the L-shaped portion ^* a ^* b ^* In color system at L ^* A has a value of 40 to 100 ^* A value of-12 or more and 3 or less, b ^* The absorbent core is an aggregate of a superabsorbent polymer and pulp fibers, the superabsorbent polymer is disposed on a skin side of the absorbent core, a junction between the absorbent core and the core-in-sheet is disposed on the skin side of the absorbent core, and a compartment surrounded by the junction is disposed on at least a part of the skin side of the absorbent core, thereby dividing a region in which the superabsorbent polymer is disposed.

The above and other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view showing a diaper according to a preferred embodiment of the absorbent article of the present invention.

Fig. 2 is a partially cut-away developed plan view schematically showing the diaper shown in fig. 1 when the diaper is developed after the side seal is broken and stretched, as seen from the skin surface side.

Fig. 3 is a section view of fig. 2 in section III-III.

Fig. 4 is a partially enlarged plan view schematically showing an arrangement state of the compartments formed in the joining portion and the superabsorbent polymer on the skin surface side of the absorbent core.

In fig. 5, (a) is a partially enlarged sectional view showing a laminated state of an absorbent core and a member on the skin surface side and a member on the non-skin surface side of the absorbent core, and (B) is a partially enlarged sectional view showing a modification of the (a) view.

Fig. 6 is a plan view showing a state in which a slit portion is arranged in an absorbent core.

Fig. 7 is a cross-sectional view in the thickness direction of the absorbent core schematically showing a state in which core-wrap sheets disposed on the skin surface side and the non-skin surface side of the absorbent core are bonded to each other at slit portions.

Detailed Description

The present invention relates to an absorbent article capable of maintaining a good appearance even without using a superabsorbent polymer containing a discoloration-inhibiting component.

In the techniques described in patent documents 1 to 3, a high-priced high-absorbent polymer containing a discoloration-inhibiting component such as an antioxidant has to be used, and the price of the absorbent article is increased.

In contrast, the absorbent article of the present invention can maintain a good appearance.

Hereinafter, a diaper which is a preferred embodiment of the absorbent article of the present invention will be described with reference to the accompanying drawings.

In the present invention, in the wearing state of the absorbent article, the side that contacts the skin of the wearer is referred to as the skin-side, skin-contact-surface side, or front-side, and the opposite side is referred to as the non-skin-side, non-skin-contact-surface side, or back-side. Even in the case of a member that does not have a surface that contacts the skin of the wearer in the wearing state of the absorbent article, these terms are used as terms indicating the relative positional relationship in the member structure of the absorbent article. The normal direction of the front or back surface of the absorbent article is referred to as the thickness direction.

As shown in fig. 1, the diaper 10 of the present embodiment includes an absorbent main body 1 and an outer body 2. The outer body 2 has a front outer body 21 and a rear outer body 22 corresponding to the front and rear sides of the wearer, respectively. The front side refers to the abdominal side of the wearer and the back side refers to the back side of the wearer. The front outer body 21 and the rear outer body 22 are formed in a laterally long shape, and the respective side edges overlap and are joined at the side seal 11 to form an annular waistline portion 10D of the diaper 10. The portion of the absorbent main body 1 extending from the outer body 2 forms an intermediate portion 10C of the diaper 10. The diaper 10 has a waist opening 12 which opens upward of the waist portion 10D and a pair of

leg openings

13, 13 which open on both left and right sides of the intermediate portion 10C.

Fig. 2 shows the diaper 10 in an unfolded state in which the side seals 11, 11 are broken. The developed state refers to a state in which each portion is stretched to expand the absorbent article into a planar shape.

In the developed state, the diaper 10 is divided into a front side portion 10F, a middle portion 10C, and a rear side portion 10R. A laterally long front outer casing 21 and a laterally long rear outer casing 22 are disposed in the front portion 10F and the rear portion 10R, respectively. The longitudinal absorbent body 1 is disposed with its longitudinal direction facing the front side portion 10F, the middle portion 10C, and the rear side portion 10R of the diaper 10. In this arrangement, the absorbent main body 1 has a longitudinal direction Y corresponding to a direction in which the front side, crotch portion, and rear side of the wearer are connected, and a width direction X orthogonal to the longitudinal direction Y.

As shown in fig. 3, the absorbent body 1 constituting the diaper 10 includes a front sheet 3 having liquid permeability on the skin side, a back sheet 4 having leakage prevention on the non-skin side, and a liquid-retaining absorbent body 5 disposed between the front sheet 3 and the back sheet 4. The absorber 5 has: an absorbent core 6 composed of an aggregate of a superabsorbent polymer 67 and pulp fibers 68; and a core-in-sheet 7 covering the outer periphery of the absorbent core 6. The core-wrap sheet 7 is made of a material having hydrophilicity, for example, hydrophilic paper or nonwoven fabric.

In the present embodiment, a pair of side sheets 9 are provided on both sides in the longitudinal direction Y of the absorbent body 1. An elastic member 91 formed in an elongated state is disposed at an end portion on the inner side in the width direction X of the side sheet 9 to form a three-dimensional gather portion 92. Further, an elastic member 93 formed in an elongated state is disposed at an end portion on the outer side in the width direction X of the side sheet 9 to form leg gathers 94. In the absorbent main body 1 of the present embodiment, the exterior nonwoven fabric 48 is disposed on the non-skin surface side of the back sheet 4.

As shown in fig. 2, the absorbent core 6 has a longitudinal direction Y and a width direction X orthogonal to the longitudinal direction as in the absorbent main body 1. As shown in fig. 2 and 3, the core wrap 7 covers the entire longitudinal direction Y of the absorbent core 6 and extends in the width direction X, and covers the skin-facing side, both sides, and the non-skin-facing side (outer periphery) of the absorbent core 6. Specifically, the skin-side core-wrap 71 covers the skin side of the absorbent core 6, and the non-skin-side core-wrap 72 covers the non-skin side of the absorbent core 6. The non-skin-side wrapping chip 72 further extends in the width direction X, is rolled up on both sides and the skin side, and is laminated and bonded on the skin side of both ends of the skin-side wrapping chip 71 in the width direction X. The laminated portion is a laminated portion 75 extending over the entire length of the absorbent core 6 in the longitudinal direction Y at 2 portions of both end portions of the absorbent core 6 in the width direction X. In fig. 3, 2 laminated portions 75 of the core wrap 7 are arranged on the skin surface side of the absorbent core 6, but the present invention is not limited thereto. For example, the sheet may be disposed on the non-skin side, or 1 or 3 or more sheets may be disposed on the non-skin side or the skin side. When 1 lamination portion 75 is disposed on the non-skin-surface side of the absorbent core 6, for example, 1 core wrap may be rolled from the skin-surface side to both side portions of the absorbent core 6 to the non-skin-surface side, and the end portions may be laminated to each other. In this case, among the 1 core-pieces, the portion disposed on the skin surface side of the absorbent core 6 is referred to as a skin surface side core-piece 71, and the portion disposed on the non-skin surface side of the absorbent core 6 is referred to as a non-skin surface side core-piece 72.

As shown in fig. 3, a superabsorbent polymer 67 is disposed on the skin surface side of the absorbent core 6. The superabsorbent polymer 67 is partitioned on the skin surface side of the absorbent core 6 by partition for each partition divided by the joint portion 55 described later. The superabsorbent polymer 67 is preferably uniformly disposed on the skin surface side of the absorbent core 6. The term "uniform" as used herein means that the amount of the superabsorbent polymer 67 which is released from the skin surface of the absorbent core 6 is measured for each zone by the following method, and the ratio of the difference between the amount of release from each zone and the average amount of release from all zones to the average amount of release from all zones is expressed as a gram weight ratio and is within.+ -. 100%. The ratio of the amount of falling off of each partition to the average amount of falling off of all the partitions is preferably within ±50%, more preferably within ±30%, in terms of a gram weight ratio.

(method of measuring distribution of superabsorbent polymer 67 in the skin-facing side of absorbent core 6)

(1) An absorbent article containing the absorbent body is divided into 2 zones in the lateral direction and 3 zones in the longitudinal direction in a plan view.

(2) The skin contact surface side portions (for example, the core sheet and the front sheet) were cut from the 1-partition absorbent core located on the skin surface side, and the absorbent core was exposed. The exposed portion was shaken downward 20 times, and the mass of the peeled superabsorbent polymer was measured and converted to gram weight (g/m ² ). This eliminates the influence of the presence or absence of the slit or the difference in area due to the shape of the absorbent core (for example, an hourglass shape), and makes it possible to compare the amount of the superabsorbent polymer released from each of the zones.

(3) The process of (2) above is performed for each partition. Next, the average drop amount (in terms of grammage) of all the partitions is calculated from the measured values of the respective partitions, and the ratio of the difference between the drop amount (in terms of grammage) of each partition and the average drop amount (in terms of grammage) of all the partitions to the average drop amount (in terms of grammage) is calculated. That is, the "amount of fall off of each partition-average amount of fall off of all partitions ]/[ average amount of fall off of all partitions ] is calculated.

The superabsorbent polymer 67 may be disposed not only on the skin surface side of the absorbent core 6 but also inside the absorbent core 6. The superabsorbent polymer 67 is preferably dispersed in the thickness direction and the planar direction of the absorbent core 6, and is supported between the pulp fibers 68.

As shown in fig. 3 and 4, a joint 55 between the absorbent core 6 and the core-in-sheet 7 (skin-side core-in-sheet 71) is disposed on the skin surface side of the absorbent core 6. The joint 55 is formed by applying a bonding agent. The adhesive can be an adhesive commonly used for such articles, and examples thereof include a hot melt adhesive. The adhesive can be applied by a method commonly used for such articles. Examples of the coating include spraying and gravure coating. In order to maintain the liquid absorbability and to maintain the uniform arrangement of the superabsorbent polymer 67, the adhesive is preferably applied at intervals linearly, more preferably spirally, to the skin surface of the absorbent core 6. That is, the bonding portions 55 formed by the bonding agent are preferably arranged at intervals linearly, preferably spirally, with respect to the skin surface of the absorbent core 6.

As shown in fig. 3 and 4, a compartment 56 surrounding the superabsorbent polymer 67 is disposed at least in a part of the skin surface side of the absorbent core 6 by the joint 55. That is, the joint 55 serves as a partition column for partitioning the placement region of the superabsorbent polymer 67 on the skin surface side of the absorbent core 6.

The compartment 56 has a space 56R vertically sandwiched between the skin surface of the absorbent core 6 and the core-in-sheet 7 (skin surface side core-in-sheet 71) in the region surrounded by the joint 55. In the space 56R provided in the compartment 56, the plurality of superabsorbent polymers 67 are uniformly arranged in the planar direction. The plurality of compartments 56 are disposed on the skin surface of the absorbent core 6. Thus, the area where the superabsorbent polymer 67 is disposed is partitioned on the skin surface side of the absorbent core 6.

The movement of the superabsorbent polymer 67 disposed on the skin surface side of the absorbent core 6 can be well suppressed by the above-described separator 56. That is, the joint 55 is formed as a partition column, and the superabsorbent polymer 67 is not easily moved between the

partitioned compartments

56, 56. In general, the diaper 10 is folded after manufacture, compressed and stored in a packaging bag for sale, and then transported and sold, and subjected to various external forces in various situations such as unsealing and use after purchase. In this case, by the arrangement of the partition 56 formed by the joint 55, the movement of the superabsorbent polymer 67 is suppressed, and the uniformity of the superabsorbent polymer arranged on the skin surface side of the absorbent core 6 is easily maintained.

Thus, even if the superabsorbent polymer 67 is discolored, the discolored color (for example, yellow or brown) can be suppressed from being agglomerated. In addition, the superabsorbent polymer 67 is uniform without forming a block on the skin surface side of the absorbent core 6, and thus can achieve rapid absorption of excreta liquid and excellent penetration of excreta liquid from the skin surface side into the absorbent core 6. This improves the absorption performance of the absorbent core 6 as a whole.

As described above, a plurality of such compartments 56 are disposed in at least a part of the skin surface side of the absorbent core 6. The region in which the plurality of compartments 56 are arranged is preferably within 1/3 of the absorbent body, more preferably within 3/4 of the absorbent body, and even more preferably within the region on the entire skin surface side of the absorbent core 6, from the viewpoints of maintaining uniform arrangement of the superabsorbent polymer 67, making the color (e.g., yellow or brown) inconspicuous after color change, and achieving high liquid absorbency. The liquid-receiving region described later is preferably contained in the range of 1/3 of the absorber or in the range of 3/4 of the absorber.

The compartments 56 are preferably arranged in a row in the longitudinal direction Y of the absorbent core 6, and the row is preferably arranged in 3 or more rows in the width direction X. This effectively suppresses the movement, bias, and drop of the superabsorbent polymer 67 in the width direction X, and can maintain uniform arrangement. From such a viewpoint, the rows are more preferably arranged in 4 or more rows in the width direction X, and even more preferably arranged in 5 or more rows. In addition, from the viewpoint of not impeding the absorption performance, the above-mentioned rows are preferably arranged in 10 rows or less, more preferably 8 rows or less, and still more preferably 6 rows or less in the width direction X. Specifically, the rows are preferably arranged in the width direction X in 3 or more and 10 or less rows, more preferably in 4 or more and 8 or less rows, and still more preferably in 5 or more and 6 or less rows.

The number of the compartments 56 (the number of the longitudinal direction Y) in 1 column is preferably 5 or more, more preferably 10 or more, and even more preferably 20 or more, from the viewpoint of effectively suppressing the movement, bias, and separation of the superabsorbent polymer 67 in the longitudinal direction Y and maintaining uniform arrangement. The number of the compartments 56 (the number in the longitudinal direction Y) in 1 row is preferably 100 or less, more preferably 50 or less, and even more preferably 30 or more from the viewpoint of securing the absorption performance. Specifically, the number of the compartments 56 (the number in the longitudinal direction Y) in 1 row is preferably 5 or more and 100 or less, more preferably 10 or more and 50 or less, and still more preferably 20 or more and 30 or less.

The partition 56 has a planar shape having an edge formed by the linear joint portion 55, and the planar shape can be formed in various shapes. For example, circular, elliptical, polygonal, etc. can be exemplified. In particular, from the viewpoint of maintaining uniform arrangement of the superabsorbent polymer 67, suppressing movement between the

compartments

56, 56 of the superabsorbent polymer 67, and preventing gel blocking from easily occurring on the skin surface side of the absorbent core 6 at the time of liquid absorption, the planar shape of the compartment 56 is preferably circular or elliptical. From this point of view, the joint 55 is preferably arranged in a spiral shape. By disposing the joint portions 55 in a spiral shape, the circular or elliptical compartments 56 can be disposed without any gap, and uniform disposition of the superabsorbent polymer 67 can be achieved with high efficiency.

The line width of the linear joint 55 is preferably 5mm or less, more preferably 3mm or less, and even more preferably 1mm or less, from the viewpoint of maintaining the liquid absorbability of the absorbent core 6 and the uniform arrangement of the superabsorbent polymer 67. The line width of the linear joint 55 is preferably 0.1mm or more, more preferably 0.3mm or more, and even more preferably 0.5 or more, from the viewpoint of suppressing movement between the

compartments

56, 56 of the superabsorbent polymer 67. Specifically, the line width of the linear joint portion 55 is preferably 0.1 to 5mm, more preferably 0.3 to 3mm, and even more preferably 0.5 to 1 mm.

Further, from the viewpoint of suppressing the falling-off of the superabsorbent polymer 67 and maintaining the uniform arrangement of the superabsorbent polymer 67 when the diaper 10 is used, it is preferable that the joint 55 constituting the compartment 56 is also arranged on the outer edge 69 of the skin surface of the absorbent core 6 (see fig. 3 and 6). The "outer edge 69 of the skin surface of the absorbent core 6" referred to herein means an edge portion along the outer periphery of the absorbent core 6 as seen when the absorbent core 6 is viewed from the skin surface side. In this case, it is preferable that the joint 55 exists in at least a part of the outer edge 69. For example, the ratio of the joint portion 55 disposed over the entire length of the outer edge 69 of the skin surface of the absorbent core 6 is preferably 5% or more, more preferably 20% or more, and still more preferably 50% or more. The larger the above ratio is, the better. Specifically, the above ratio is preferably 5% or more and 100% or less, more preferably 20% or more and 100% or less, and still more preferably 50% or more and 100% or less.

The grammage of the bonding portion 55 on the skin surface side of the absorbent core 6 (the grammage of the bonding agent forming the bonding portion 55) is preferably 20g/m from the viewpoint of maintaining the liquid absorbability of the absorbent core 6 and maintaining the uniform arrangement of the superabsorbent polymer 67 ² Hereinafter, it is more preferably 15g/m ² Hereinafter, it is more preferably 10g/m ² The following is given. The grammage of the joining portion 55 on the skin surface side of the absorbent core 6 is preferably 1g/m from the viewpoint of securing the joining strength between the absorbent core 6 and the skin surface side core-in sheet 71 and suppressing the movement between the

compartments

56, 56 of the superabsorbent polymer 67 ² The above is more preferably 3g/m ² The above is more preferably 5g/m ² The above. Specifically, the grammage of the joining portion 55 on the skin surface side of the absorbent core 6 is preferably 1g/m ² Above and 20g/m ² Hereinafter, it is more preferably 3g/m ² Above and 15g/m ² Hereinafter, it is more preferably 5g/m ² Above and 10g/m ² The following is given.

(method of measuring grammage of the bonded portion 55 on the skin surface side of the absorbent core 6)

The region of the adhesive-coated portion (portion where the bonding portion 55 is disposed) on the non-skin-surface side of the core-wrap sheet 7 and the skin-surface side of the absorbent core 6 is cut out from the skin-surface side of the core-wrap sheet 7 to a predetermined thickness (thickness impregnated with the adhesive, for example, 5mm thickness) to remove pulp fibers and superabsorbent polymer. The adhesive (e.g., a hot melt adhesive) was extracted from the coating portion using a solvent, the extracted solution was dried and cured under reduced pressure by a rotary evaporator, and the quality of the obtained adhesive was measured.

The grammage of the bonded portion 55 on the skin surface side of the absorbent core 6 was calculated by dividing the measured mass of the bonding agent by the area of the portion of the applied portion that ends in the width direction and the length direction.

The solvent may be appropriately selected according to the type of the binding agent. In the case where the adhesive to be measured is, for example, a hot melt adhesive, toluene, butanone, and heptane can be exemplified as the solvent.

The gram weight of the superabsorbent polymer 67 disposed on the skin surface side of the absorbent core 6 is preferably 10g/m from the viewpoint of maintaining the liquid absorbency of the absorbent core 6 and making the color after discoloration inconspicuous ² The above is more preferably 20g/m ² The above is more preferably 30g/m ² The above. The grammage of the superabsorbent polymer disposed on the skin surface side of the absorbent core 6 is preferably 100g/m from the viewpoint of maintaining the liquid permeability into the absorbent core 6 and suppressing the occurrence of gel blocking ² Hereinafter, more preferably 80g/m ² Hereinafter, it is more preferably 60g/m ² The following is given. Specifically, the gram weight of the superabsorbent polymer disposed on the skin surface side of the absorbent core 6 is preferably 10g/m ² Above and 100g/m ² Hereinafter, it is more preferably 20g/m ² 80g/m of the above ² Hereinafter, it is more preferably 30g/m ² Above and 60g/m ² The following is given.

Further, in the diaper 10, the absorbent core 6 is disposed on at least one of the skin-facing side and the non-skin-facing side, and the absorbent core is disposed on the side having a surface L ^* a ^* b ^* L in color System ^* Value: 40 to 100, a ^* Value: -12 or more and 3 or less, b ^* Value: -a component of a color in a range of above 24 and below 3. The color is L ^* a ^* b ^* Preferred L in the color System ^* Value: 60 to 80, a ^* Value: -9 or more and 0 or less, b ^* Value: -15 or more and-6 or less, more preferably L ^* Value: 65 to 75, a ^* Value: -6 or more and-3 or less, b ^* Value: -12 or more and-9 or less. In the present specification, the color is also referred to as "cover color" because it is present in a member that is superimposed from above on the skin surface side or the non-skin surface side compared to the arrangement position of the superabsorbent polymer 67. In addition, L ^* a ^* b ^* The color System is defined in JIS-Z-8729, L ^* Indicating brightness, a ^* And b ^* Indicating the direction of the color. Each value is expressed as a positive to negative value. L (L) ^* The larger the value of (c) indicates the brighter. Regarding a ^* Positive values indicate reddish directions and negative values indicate greenish directions. Concerning b ^* Positive values indicate a yellowish color, and negative values indicate a bluish color.

The cover color is a color within a range of complementary colors to the color (e.g., yellow or brown) of the superabsorbent polymer 67 after the color change. The colors in the complementary color relationship appear to overlap each other when the diaper 20 is viewed from the outside. I.e. appears to be a color mixture. As a result, the color of the superabsorbent polymer 67 after the color change is reduced from the outside of the diaper 10, particularly from the skin surface side, and becomes inconspicuous. More specifically, in the overlapping of the members of the fiber material such as nonwoven fabric, the members of the filler, and the members that are likely to transmit light, the color of the superabsorbent polymer 67 after the color change is also projected to the cover color on the outer side thereof. As a result, the colors in the complementary color relationship are mixed with each other when viewed from the outside of the diaper 10, and the color saturation of the color of the superabsorbent polymer 67 after the color change is reduced and made inconspicuous.

The superabsorbent polymer 67 on the skin surface side of the absorbent core 6 is uniformly arranged in the planar direction, and thus the color after the color change does not become a lump, and appears to be dispersed in the above-mentioned cover color. Therefore, when the diaper 10 is viewed from the outside, particularly when viewed from the skin side, it is possible to avoid the colors in the complementary color relationship from being blocked and appearing adjacent to each other. In general, if colors in a complementary color relationship are adjacent to each other in blocks, respectively, saturation is emphasized, and by configuring as described above, it is possible to avoid such saturation of complementary colors from being emphasized. From this viewpoint, the superabsorbent polymer 67 is preferably uniformly arranged as described above.

Further, since the member having the above-mentioned cover color is present, the superabsorbent polymer 67 preferably has a good appearance from the initial stage of use of the diaper 10 regardless of the presence or absence of discoloration or the degree of discoloration.

(L in the cover color) ^* a ^* b ^* Method for measuring values of a color system

The component to be measured is taken out from the absorbent article and measured. Specifically, after the adhesive or the like used for bonding the measurement target member and other members is weakened by a cooling method such as cold spraying, the measurement target member is carefully peeled off and taken out.

White sheets were laid down on the lower side, and the measurement was performed using a color difference meter such as a simple spectrocolorimeter NF333 (trade name) manufactured by japan electrochromic co. In the measurement method based on the simple spectrocolorimeter NF333, a Stapler (Stapler) is used for installation

An ND110 sensor of 4mm was measured at a field angle of 2 DEG using an O-ring (small) at the tip of the sensor and a light source C/2.

In measurement, the sensor unit of the color difference meter is measured in direct contact with the measurement site of the member to be measured.

As the member having the skin surface side of the cover color, as shown in fig. 5 (a), the front sheet 3 and the skin surface side wrapping sheet 71 can be exemplified. Further, as shown in fig. 2 and 3, a side sheet 9 partially overlapped with respect to the absorbent core 6 is also included. As shown in fig. 5 (B), when the intermediate member 35 is present between the front sheet 3 and the absorber 5, the intermediate member 35 is also included. The intermediate member 35 is preferably made of a hydrophilic fibrous material having a function of diffusing the excreted liquid transmitted from the front sheet 3 in the planar direction and rapidly absorbing the excreted liquid on a wide surface of the absorber 5.

As the members on the non-skin side where the cover color is disposed, the back sheet 4, the non-skin side wrapping sheet 72, and the exterior nonwoven fabric 48 can be exemplified. As shown in fig. 1 and 2, the outer body 2 is also included in a member on the non-skin surface side.

The cover color may be arranged on one of the members on the skin side and the non-skin side, or may be arranged on 2 or more members. The above visual effect is preferable when the cover color is arranged in 2 or more members. For example, it is preferable that the cover color is arranged in 1 member or 2 or more members on both the skin surface side and the non-skin surface side.

From the color (L) after the cover color is easily changed from the superabsorbent polymer 67 ^* a ^* b ^* The respective values of the color system) and the viewpoint of making the visual effect more effective, it is preferable to dispose the cover color on a member as close to the superabsorbent polymer 67 as possible. For example, the priority order of the members for disposing the cover color on the skin surface side is the order of the skin surface side cover sheet 71, the intermediate member 35, the front sheet 3, and the side sheet 9. The priority order of the members for disposing the cover color on the non-skin side is the order of the non-skin side cover sheet 72, the back sheet 4, the exterior nonwoven fabric 48, and the exterior body 2. Preferably, a cover color is provided at least on the core sheet 7 on both the skin surface side and the non-skin surface side. Particularly preferably, the cover color is disposed at least on the skin-side cover chip 71.

The cover color may be disposed in the whole part of the member or in a part thereof. When disposed in a part, it is preferable to dispose the absorbent core in a region including the region overlapping the absorbent core 6. In view of unexpected detachment of the superabsorbent polymer 67 or the like, the cover color is preferably disposed on the entire member.

When the intermediate member 35 is present as a member on the skin surface side of the absorbent core 6, the cover color may be disposed in the intermediate member 35 or may not be disposed. When not disposed, the cover color is disposed on the other skin-side member (for example, the core sheet). Even when the intermediate member 35 is not covered with color, the color of the superabsorbent polymer 67 after color change can be separated from the skin side of the diaper 10. In combination with the above-described effect of the covering color of the other member, the color of the superabsorbent polymer 67, which is seen from the outside (skin surface side) of the diaper 10 after being changed, is further reduced, and the effect of making it inconspicuous can be further improved.

In the case where the intermediate member 35 is not provided with the cover color, it is preferable to provide L ^* The value is not less than 50 and not more than 80, i.e., gray. This makes it possible to make the color of the superabsorbent polymer 67 less noticeable after the color change. In general, the saturation of the color can be reduced by overlapping gray colors, and the color change portion of the polymer overlaps the cover color, and the gray colors are overlapped at the portion where the saturation is reduced, thereby making the color change portion more inconspicuous.

As described above, the superabsorbent polymer 67 is disposed on the skin surface side of the absorbent core 6 in the diaper 10, and the member having the above-described cover color is disposed. In the state before use of the diaper 10, it is preferable that the absorbent body 5L of the diaper 10 is seen from the skin surface side ^* The value is 85 or less, more preferably 80 or less, and still more preferably 75 or less. Thus, the appearance of the polymer before and after discoloration is not easily impaired. In addition, L is seen from the skin surface side of the diaper 10 ^* The value is preferably 60 or more, more preferably 65 or more, and further preferably 70 or more. This can ensure the effect of preventing the appearance of the polymer from being damaged before and after discoloration, and can suppress the appearance from becoming black before use. Specifically, in a state before use of the diaper 10, L is preferably viewed from the skin surface side of the diaper 10 ^* A value of 60 or more and 85 or moreThe ratio is more preferably 65 to 80, and still more preferably 70 to 75.

The L-shaped diaper 10 is seen from the skin side ^* The value can be measured by, for example, a simple spectrocolorimeter NF333 (trade name) manufactured by japan electric color industry co.

In the diaper 10, it is preferable that the absorbent core 6 has a higher gram weight of the superabsorbent polymer 67 as it goes from the non-skin side to the skin side. The superabsorbent polymer 67 herein includes a polymer mixed with pulp fibers 68 in the absorbent core 6 and a polymer disposed on the skin surface side of the absorbent core 6.

The term "increased" means that the absorbent core 6 contains relatively more superabsorbent polymer 67 in the layer on the skin surface side than in the layer on the non-skin surface side when viewed in the thickness direction, and the amount is expressed in terms of gram weight. The bias of the superabsorbent polymer 67 may be gradually increased from the non-skin surface side to the skin surface side, or may be gradually increased. At least the outermost layer on the non-skin side of the absorbent core 6 is preferably contained in a larger amount of the superabsorbent polymer 67 than the outermost layer on the skin side. Thus, the high absorption capacity of the diaper 10 can be ensured and the leakage preventing property can be improved while the high absorption capacity is ensured together with the above-described high-absorbent polymer 67 disposed on the skin surface side of the absorbent core 6.

From the same point of view, it is more preferable that the superabsorbent polymer 67 is contained in the absorbent core 6 as described below. That is, first, as shown in fig. 3, the absorbent core 6 is divided into a front portion 61 on the skin surface side and a back portion 62 on the non-skin surface side in the thickness direction. This division is performed by equally dividing the absorbent core 51 by 2 in the thickness direction. At this time, the gram weight of the superabsorbent polymer 67 in the front face portion 61 is preferably 40g/m ² The above is more preferably 60g/m ² The above is more preferably 80g/m ² The above. In addition, the grammage of the superabsorbent polymer 67 in the front portion 61 is from the viewpoint of preventing gel blocking due to the increase of the polymer densityPreferably 250g/m ² Hereinafter, more preferably 200g/m ² Hereinafter, it is more preferably 150g/m ² The following is given. Specifically, the gram weight of the superabsorbent polymer 67 in the front face portion 61 is preferably 40g/m ² Above and 250g/m ² Hereinafter, more preferably 60g/m ² Above and 200g/m ² Hereinafter, it is more preferably 80g/m ² Above and 150g/m ² The following is given.

(method of measuring grammage of superabsorbent polymer 67 in absorbent core 6)

First, the section of the measurement target portion of the absorbent core 6 was observed with a microscope, and was equally divided into portions 2 in the thickness direction, and each of the front surface portion 61 and the back surface portion 62 was collected.

The mass of the superabsorbent polymer 67 was calculated by quantifying each of the mixtures of the superabsorbent polymer 67 and the pulp fibers 68 based on the method for quantifying the fibers and/or the water-absorbent polymer described in japanese patent No. 4225821.

Specifically, after the mass of each site to be collected is measured, the superabsorbent polymer 67 is reduced in molecular weight in each site. The high-absorptivity polymer 67 can be reduced in molecular weight by ultraviolet irradiation. At this time, the mixture of the superabsorbent polymer 67 and the pulp fibers 68 at each site is immersed in an aqueous solution containing ascorbic acid and riboflavin in a state of being placed in a mesh bag or the like. The super absorbent polymer 67 is expanded by dipping, and then the mesh bag is taken out of the aqueous solution, and the ultraviolet irradiation is performed to reduce the molecular weight of the super absorbent polymer 67. Then, the components produced by the low molecular weight are removed by washing with water. After the removed mesh bag was sufficiently washed with water, dehydration and drying were performed and the quality was measured. The mass of the pulp fiber 68 was calculated by subtracting the mass of the bag monomer from the measured mass, and the mass of the pulp fiber 68 was subtracted from the mass of each portion measured initially to obtain the mass of the superabsorbent polymer 67. Based on the obtained value divided by the area of each site, the grammage of the superabsorbent polymer 67 of each site is obtained. The average value obtained by performing the above measurement 3 times was used as the grammage of the superabsorbent polymer 67 at each of the front surface portion 61 and the back surface portion 62.

Further, in the diaper 10, the absorber 5 preferably has a compressed portion (not shown) formed by applying a certain amount of compression in the thickness direction by embossing or the like. This can prevent the superabsorbent polymer 67 from moving to a position where the color becomes conspicuous after the color change (for example, an end portion of the absorbent core 6).

In the compression portion, the pulp fibers 68 are compressed, whereby the movement of the superabsorbent polymer 67 is easily restrained. As long as this function is achieved, the depth of the compressed portion can be set appropriately, and may be a depth reaching the back surface portion 62 of the absorbent core 6. From the viewpoint that the absorbency of the superabsorbent polymer 67 is not impaired by compression, it is preferable to form a compressed portion on the skin surface side of the absorbent body 5, which is formed to a depth of the front surface portion 61 of the absorbent core 6. The compressed portion is preferably located only in the front surface portion 61, from the viewpoint of not reducing the flexibility of the absorbent core 6. The compressed portion may be formed in a linear shape on the skin surface side in the planar direction of the absorbent body 5 with respect to the absorbent body 5 including the absorbent core 6 and the core wrap 7, for example. As the linear compressed portion, for example, a structure in which the linear compressed portion is arranged in an inclined lattice shape with respect to the longitudinal direction Y and the width direction X can be exemplified. The shape of the compressed portion is not particularly limited as long as the compressed portion can function as described above, and examples thereof include a staggered shape and a wavy shape, in addition to the inclined lattice shape described above. The compression unit is not limited to the case of being provided only in the absorber 5, and may be configured to compress the absorber 5 and the front sheet 3 integrally, for example.

In the diaper 10, as shown in fig. 6, the slit portion 8 is preferably disposed in the absorbent core 6. The slit portion 8 is a space portion formed in the thickness direction from the skin surface side in which the amount of pulp in the absorbent core 6 is smaller than the surrounding area. The slit portion 8 may be a slit-like portion or a groove having a predetermined width. In the arrangement position of the slit portion 8, the excreted liquid easily permeates in the thickness direction of the absorbent core 6. This can improve the rapid liquid absorption retention and the moisture regain resistance of the diaper 10. That is, the rapid improvement of the liquid absorption retention property and the moisture regain resistance and the inconspicuous discoloration of the superabsorbent polymer 67 can be simultaneously achieved.

The slit portion 8 preferably has a depth from the skin surface side of the absorbent core 6 to the back surface portion 62, and more preferably has a through hole from the skin surface side of the absorbent core 6 to the non-skin surface side, from the viewpoint of improving the liquid absorption and retention properties and the moisture regain resistance. The slit portion 8 is preferably located in the liquid receiving region Q of the absorbent core 6 from the same point of view as described above.

The "liquid receiving region Q" herein refers to a region that directly receives excreted liquid such as urine. In the diaper 10, the liquid receiving area Q is an area within 3.5cm in the lateral direction from a line S1 dividing the length 2 of the lateral direction X equally, and is an area within 8cm in the front direction from a line M1 dividing the length 2 of the longitudinal direction Y equally. In the case where the absorbent article of the present invention is a sanitary napkin for daily use, the liquid receiving region Q is a region that is a middle portion that divides the absorbent core 6 equally by 3 in the longitudinal direction Y and is within 2.5cm in the lateral direction from a line that divides the length 2 of the middle portion in the width direction X equally. In the case of a sanitary napkin having a wide rear flap covering the buttocks, such as for night use, the absorbent article of the present invention is a liquid receiving region Q in the second portion which is equal to 4 in the longitudinal direction Y and in a region within 2.5cm in the lateral width direction from a line which equally divides the length 2 of the portion in the width direction X. In the case where the absorbent article of the present invention is a urine collection pad or an incontinence pad, the same configuration as in the diaper 10 is set.

In fig. 6, the slit portions 8 have a length extending in the front-rear direction from the liquid receiving area Q in the longitudinal direction Y, and are arranged in 3 rows in the width direction X. The arrangement and number of the slit portions 8 are not limited to this, and the embodiment shown in fig. 6 is preferable from the viewpoint of improving the liquid absorption and retention properties and the moisture regain resistance.

When there are a plurality of slit portions 8, the width (the width of the slit, the length in the width direction X) of each slit portion 8 may be the same as or different from each other. When the width of each slit portion 8 is the same, the excreted liquid is likely to spread uniformly and rapidly in the absorbent core 6. This is preferable because a wider area of the absorbent core 6 can be used for liquid absorption. From the viewpoint of making this effect more remarkable, the width of each slit portion 8 is preferably 1mm or more, more preferably 3mm or more. The width of each slit 8 is preferably 20mm or less, more preferably 15mm or less. Specifically, the width of each slit 8 is preferably 1mm or more and 20mm or less, more preferably 3mm or more and 15mm or less. In addition, even when the widths of the slit portions 8 are different from each other, the widths of the slit portions 8 are preferably within the above-described range.

When there are a plurality of slit portions 8, the lengths (lengths in the longitudinal direction Y) of the slit portions 8 may be the same as or different from each other. When the lengths of the slit portions 8 are the same, the excreta liquid is easily and uniformly dispersed in the absorbent core 6. This is preferable because a wider area of the absorbent core 6 can be used for liquid absorption. From the viewpoint of making this effect more remarkable, the length of each slit portion 8 is preferably 50mm or more, more preferably 100mm or more. The length of each slit 8 is preferably 350mm or less, more preferably 300mm or less. Specifically, the length of each slit 8 is preferably 50mm to 350mm, more preferably 100mm to 300 mm. In addition, even when the lengths of the slit portions 8 are different from each other, the lengths of the slit portions 8 are preferably within the above-described range.

The length of each slit 8 is preferably formed as follows when dividing the absorbent core 6 equally in the longitudinal direction Y by 3 and dividing it into the front portion F, the intermediate portion C and the rear portion R.

When the lengths of the slit portions 8 are the same, the positions of the front portions F side end portions T1 of the slit portions 8 may be the same or different from each other. Similarly, the positions of the end portions T2 on the rear portion R side of the slit portions 8 may be the same as or different from each other. In fig. 6, the positions of the front end portions T1 on the front F side of the slit portions 8 are identical to each other, and the positions of the rear end portions T2 on the rear R side of the slit portions 8 are identical to each other.

Preferably, each slit portion 8 is not present in the rear portion R. This can achieve a balance between the liquid absorption capacity of the absorbent core 6, the liquid diffusion in the absorbent core 6, and a good wearing feel of the diaper 10. In particular, the distance between the end T2 of each slit 8 on the rear portion R side and the boundary position T3 between the intermediate portion C and the rear portion R in the absorbent core 6 is preferably 5mm or more, more preferably 10mm or more, and further preferably 50mm or less, more preferably 45mm or less. Specifically, the distance between the end T2 of each slit 8 on the rear side R and the boundary position T3 is preferably 5mm or more and 50mm or less, more preferably 10mm or more and 45mm or less. Thereby, the diffusion of the liquid in the high grammage region becomes more likely to occur. In addition, the absorbent core 6 is easily deformed by bending, and the wearing feeling of the diaper 10 is further improved.

In particular, when the slit portions 8 are not present on the rear portion R side of the absorbent core 6 at positions corresponding to the excrement discharge portion of the wearer, the discharged excrement is preferably less likely to adhere to the skin of the wearer. In the rear portion R side, it can be said that the positions of the end portions T2 on the rear portion R side of all the slit portions 8 are biased toward the front side F (toward the front side F) than the positions corresponding to the faecal discharge portion of the wearer.

The slit 8 described above can be produced by providing a non-air-permeable convex portion in a portion to be the slit 8 in a concave portion for aggregation disposed on the outer peripheral surface of the rotary drum, in addition to the method of making a slit with respect to the absorbent core 6.

As shown in fig. 7, the slit 8 is preferably joined to the core-wrap 7 (the skin-side core-wrap 71 and the non-skin-side core-wrap 72) disposed on the skin-side and non-skin-side of the absorbent core 6 at the position of the slit 8. That is, the skin-side core wrap 71 and the non-skin-side core wrap 72 are preferably bonded to the slit 8 from both sides of the absorbent core 6. In this case, the slit portion 8 is more preferably a through hole. The above-mentioned joint is more preferably formed so as not to peel off even when wetted with excreted liquid. As a result, the superabsorbent polymer 67 does not easily move to the slit of the absorber 5, and the discolored superabsorbent polymer 67 is not easily visible from the outside. The package chips 71 and 72 can be bonded to each other by various methods for achieving the above-described functions.

Next, the respective components constituting the diaper 10 will be described.

(absorber 5)

As the liquid-retentive absorbent member 5, any absorbent member used in such a diaper can be used without any particular limitation as long as the effects of the present invention can be obtained.

The absorbent body 5 preferably contains synthetic fibers. Specific examples of the synthetic fibers include polypropylene fibers, polyethylene fibers, and polyester fibers. Further, it is preferable that at least the absorbent core 6 of the absorbent body 5 and the core-around sheet 7 contain synthetic fibers, and it is more preferable that both the absorbent core 6 and the core-around sheet 7 contain synthetic fibers. The absorbent body 5 is not easily collapsed even when exposed to excreta by containing synthetic fibers. As a result, the superabsorbent polymer 67 having a color change can be prevented from being seen from the gaps of the deformed absorber 5.

In the absorbent core 6, the surface area of the superabsorbent polymer 67 is preferably increased as the skin surface side is provided. The superabsorbent polymer 67 tends to appear whiter due to diffuse reflection of light when the surface area is large. Thus, even if the superabsorbent polymer 67 in the vicinity of the skin surface side is discolored, the diaper 10 is easily made to look whiter when seen from the skin surface side.

In addition, the absorber 5 may have an antioxidant. Specific examples of the antioxidant include a hindered phenol antioxidant such as triethylene glycol-bis- [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate ], 1, 6-hexanediol-bis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], octadecyl-3- (3, 5-di-t-butyl-4-hydroxyphenyl propionate and 3, 5-di-t-butyl-4-hydroxybenzylphosphonate-diethyl ester, and an amine antioxidant such as n-butylamine, triethylamine and diethylaminomethyl methacrylate, and the like, and may be contained in either one of the absorbent core 6 and the core-wrap 7 constituting the absorbent body 5 or in both of them, and may be contained in a synthetic fiber in the absorbent body or in a hot-melt adhesive.

(front sheet 3)

The front sheet 3 is liquid permeable, and the front sheet used in such a diaper can be used without any particular limitation. From the viewpoint of allowing the discharged body fluid to rapidly permeate and move to the absorbent body and from the viewpoint of making the skin feel good, a hydrophilic heat-bonded nonwoven fabric is preferable, and a hot air nonwoven fabric is particularly preferable. The thermoplastic resin fiber after hydrophilization treatment is preferably a three-dimensional crimped fiber in which 2 crimps or 3 crimps are performed. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are produced, cut to a predetermined length, and various hydrophilizing agents are applied at a stage before forming a staple fiber (staple). Hydrophilization treatment based on a hydrophilizing agent known to those skilled in the art can be used, wherein various alkyl sulfonates typified by α -alkenyl sulfonate, acrylic acid salts, acrylic acid salt/acrylamide copolymers, ester amides, salts of ester amides, polyethylene glycol and derivatives thereof, water-soluble polyester resins, various silicone derivatives, various saccharide derivatives, mixtures thereof, and the like can be used as the hydrophilizing agent.

The front sheet 3 preferably has a concave-convex structure. When the front sheet 3 having the uneven structure is disposed on the skin surface side of the absorber, diffuse reflection of light tends to occur on the skin surface side of the front sheet 3, and the diaper 10 tends to be seen whiter when viewed from the skin surface side. As a result, the discolored superabsorbent polymer 67 is not easily visible from the outside.

The fibers constituting the front sheet 3 are preferably mixed with a color tone changing agent. The color tone changing agent is a component that has a function of reducing the transmittance of light entering the front sheet 3 and scattering the light. By mixing the color tone changing agent into the constituent fibers of the front sheet 3, the color-changed superabsorbent polymer 67 is less likely to be seen from the skin surface side.

Specific examples of the color tone changing agent include inorganic powder and organic powder having a refractive index different from that of the constituent fibers of the front sheet 3.

Examples of the inorganic powder include titanium oxide, porous silicon oxide (silica), porous silica, alumina (Alumina), lime, and clay minerals. Examples of clay minerals include swellable clay minerals (clay), montmorillonite, bentonite, kaolinite, sericite, illite, andalusite, chlorite, zeolite, talc, mizukanite, and the like.

Examples of the organic powder include polyethylene powder, polyester powder, polypropylene powder, polyacrylic acid powder, polyacrylate powder, cellulose powder, viscose silk powder, silicone compound powder, and fluorine compound powder. Examples of the material obtained by coloring these organic powders with a coloring material are as follows. Among them, titanium oxide is preferably used as the color tone changing agent.

The amount of the color tone changing agent to be mixed is preferably 0.1 mass% or more, more preferably 1 mass% or more, and still more preferably 3 mass% or more, based on 100 mass% of the total constituent fibers of the front sheet 3. By mixing titanium oxide in a certain amount or more into the constituent fibers of the front sheet 3, light can be effectively scattered. On the other hand, the upper limit value of the mixing amount of titanium oxide in the constituent fibers of the front sheet 3 is not particularly limited as long as the effect of the present invention can be obtained, and is practically 10 mass% or less.

(Back sheet 4)

As the back sheet 4, a moisture-permeable film alone, a composite sheet obtained by bonding a film or a nonwoven fabric, or a water-repellent nonwoven fabric (SMS, SMMS, or the like) can be used. In terms of cost and compatibility with the offset-preventing adhesive, it is preferable to use a separate moisture-permeable film as the leakage-preventing member. Examples of the film member in this case include a film obtained by melt-kneading a thermoplastic resin and an inorganic filler which does not have compatibility with the thermoplastic resin, extruding the melt, and stretching the melt to a predetermined size and having micropores, and a film having high compatibility with water and having no pores, such as a saturated film, and capable of discharging water vapor.

The back sheet 4 is preferably provided with the cover color described above. The position of the cover color preferably overlaps with a position where the superabsorbent polymer 67 in the absorbent core 6 is present in a large amount in a plan view of the absorbent core 51. In particular, when a lovely character such as a rabbit or cat is printed on the back sheet 4 as the cover color, the discoloration of the superabsorbent polymer 67 becomes inconspicuous from the back sheet 4 side, and the user who needs the diaper 10 can be attracted more preferably.

The intermediate member 35 may be made of various materials commonly used for such articles, as the outer body 2, the side sheets 9, the elastic members disposed thereon, and the outer nonwoven fabric 48 constituting the diaper 10.

As described above, the diaper 10 of the present embodiment is not easy to see the discoloration of the superabsorbent polymer 67 from the outside, and therefore can maintain a good appearance even if the superabsorbent polymer containing a discoloration-inhibiting component is not used.

The diaper 10 of the present embodiment is shown as a pants-type diaper, but is not limited thereto, and may be a tape-type diaper. In the diaper 10 of the present embodiment, the outer package is separated into the front side and the rear side, but the present invention is not limited thereto, and various shapes can be adopted. For example, the outer cover is formed in a shape covering the entire front side portion 10F, the intermediate portion 10C, and the rear side portion 10R of the diaper 10, and is formed in a shape shrinking in the width direction in the intermediate portion 10C of the diaper 10. The shape of the absorbent core 6 is not limited to the shape of the present embodiment, and various shapes can be adopted. For example, the planar shape of the absorbent core 6 may be a shape that is contracted inward in the width direction X in the intermediate portion C.

The absorbent article of the present invention includes, in addition to the diapers of the above embodiments, absorbent articles such as panty liners, incontinence pads, sanitary napkins, and urine collection pads. In addition, other components matched to the purpose or function may be appropriately combined in the above-described structure.

With respect to the above embodiments, the present invention further discloses the following absorbent articles.

<1>

An absorbent article comprising an absorbent body having an absorbent core and a core wrap covering the skin side and non-skin side of the absorbent core, wherein,

the absorbent core is provided with a sheet member having a sheet member formed on at least one of the skin surface side and the non-skin surface side thereof ^* a ^* b ^* In color system at L ^* A has a value of 40 to 100 ^* A value of-12 or more and 3 or less, b ^* A component having a color in a range of-24 or more and 3 or less,

the absorbent core is an aggregate of a superabsorbent polymer and pulp fibers, the superabsorbent polymer is disposed on the skin surface side of the absorbent core,

a junction of the absorbent core and the core wrap is disposed on the skin surface side of the absorbent core, and a compartment surrounded by the junction is disposed on at least a part of the skin surface side of the absorbent core, thereby dividing a region in which the superabsorbent polymer is disposed.

<2>

Above-mentioned<1>In the absorbent article described above, the grammage of the joined portion on the skin surface side of the absorbent core is 3g/m ² Above and 10g/m ² The following is given.

<3>

The absorbent article according to <1> or <2>, wherein the joining portion is arranged in a spiral shape.

<4>

The absorbent article according to any one of the above items <1> to <3>,

the absorbent core has a longitudinal direction corresponding to a direction in which the front side, crotch portion, and rear side of the wearer are joined, and a width direction orthogonal to the longitudinal direction,

the compartments surrounding the superabsorbent polymer form columns in the longitudinal direction, and the columns are arranged in 3 or more columns in the width direction.

<5>

The absorbent article according to any one of the above items <1> to <4>,

in the absorbent core, the gram weight of the superabsorbent polymer increases from the non-skin side to the skin side.

<6>

The absorbent article according to any one of the above items <1> to <5>,

when the absorbent core is divided into a front portion on the skin surface side and a back portion on the non-skin surface side in the thickness direction, the gram weight of the superabsorbent polymer in the front portion is 40g/m ² The above.

<7>

The absorbent article according to any one of the above items <1> to <6>,

A front sheet is disposed on the skin surface side of the absorber, and an intermediate member is disposed between the absorber and the front sheet.

<8>

The absorbent article according to <7>,

the intermediate part is at L ^* a ^* b ^* L shown in color System ^* An achromatic color having a value of 50 to 80 inclusive.

<9>

The absorbent article according to any one of the above items <1> to <8>,

the absorbent body is seen from the skin surface side of the absorbent article and is formed with a cross section L ^* a ^* b ^* L shown in color System ^* The value is 85 or less.

<10>

The absorbent article according to any one of the above items <1> to <9>,

the absorber has a compression portion.

<11>

The absorbent article according to any one of the above items <1> to <10>,

the absorbent core is provided with a slit portion, and the core wrap pieces disposed on the skin surface side and the non-skin surface side of the absorbent core are bonded to each other in the slit portion.

<12>

The absorbent article according to any one of the above items <1> to <11>,

in the absorbent core, the surface area of the superabsorbent polymer increases as the absorbent core is moved toward the skin surface.

<13>

The absorbent article according to any one of the above items <1> to <12>,

a back sheet disposed on the non-skin side of the absorber, the back sheet being formed by disposing the sheet on the side of the L ^* a ^* b ^* In color system at L ^* A has a value of 40 to 100 ^* A value of-12 or more and 3 or less, b ^* A component having a color in a range of-24 or more and 3 or less.

<14>

The absorbent article according to any one of the above items <1> to <13>,

a front sheet having a concave-convex structure is disposed on the skin surface side of the absorber.

<15>

The absorbent article according to any one of the above items <1> to <14>,

the absorber has an antioxidant.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The present application claims priority based on patent application publication number 2019-122080 filed in japan at 6/28, the content of which is incorporated by reference as part of the description of the present specification.

Description of the reference numerals

1. Absorbent body

11. Side seal

12. Waist opening

13. Leg opening

2. Outer package

21. Front side outer package

22. Rear side outer package

3. Front sheet

35. Intermediate part

4. Back sheet

5. Absorbent body

55. Joint part

56. Compartment

56R space

6. Absorbent core

61. Front face part

62. Back surface portion

67. Superabsorbent polymer

68. Pulp fiber

69. Outer edge of skin surface of absorbent core

7. Packaging chip

71. Skin surface side wrapping chip

72. Non-skin-surface side-wrapping chip

75. Lamination part of chipboard

8. Slit portion

9. Side sheet

91. Elastic component

92. Three-dimensional fold portion

93. Elastic component

94. Leg fold

10. Diaper with a front cover

Front side of 10F diaper

Intermediate portion of 10C diaper

Rear side portion of 10R diaper

Waist portion of 10D diaper

Front side of F absorbent core

C middle portion of absorbent core

Rear side portion of R-absorbent core

Y longitudinal direction of absorbent core (or longitudinal direction of absorbent body)

The width direction of the X absorbent core (or the width direction of the absorbent body).

Claims

1. An absorbent article having an absorbent core and a core wrap covering the skin side and the non-skin side of the absorbent core, the absorbent article characterized in that:

A junction portion between the absorbent core and the core-spun sheet is disposed on the skin surface side of the absorbent core, a compartment is disposed on at least a part of the skin surface side of the absorbent core, the compartment being surrounded by the junction portion and the superabsorbent polymer, a region in which the superabsorbent polymer is disposed is partitioned,

the color is a color in a range of complementary color relationship to the color of the superabsorbent polymer after color change,

the engagement portion is arranged in a spiral shape, the compartments are arranged without gaps,

the color is disposed on the whole of the member.

2. The absorbent article of claim 1, wherein:

the joining portion on the skin surface side of the absorbent core had a grammage of 3g/m ² Above and 10g/m ² The following is given.

3. The absorbent article of claim 1 or 2, wherein:

the absorbent core has a longitudinal direction corresponding to a direction in which a front side, a crotch portion, and a rear side of a wearer are connected, and a width direction orthogonal to the longitudinal direction,

4. The absorbent article of claim 1 or 2, wherein:

5. The absorbent article of claim 1 or 2, wherein:

6. The absorbent article of claim 1 or 2, wherein:

7. The absorbent article of claim 6, wherein:

8. The absorbent article of claim 1 or 2, wherein:

9. The absorbent article of claim 1 or 2, wherein:

The absorber has a compression portion.

10. The absorbent article of claim 1 or 2, wherein:

11. The absorbent article of claim 1 or 2, wherein:

12. The absorbent article of claim 1 or 2, wherein:

13. The absorbent article of claim 1 or 2, wherein:

14. The absorbent article of claim 1 or 2, wherein:

the absorber has an antioxidant.