CN114040737B - Absorbent article - Google Patents

Abstract

The present invention provides an absorbent article, which has an absorbent body, the absorbent body has an absorbent core and a wrapping chip covering the skin side and the non-skin side of the absorbent core, and the skin side and the non-skin side of the absorbent core At least one of the skin side is provided with an L ^* value of 40 to 100, an a ^* value of -12 to 3, and a b ^* value of -24 or more in the L ^* a ^* b ^* color system. 3 or less colors, the absorbent core is an aggregate of superabsorbent polymer and pulp fibers, the superabsorbent polymer is arranged on the skin side of the absorbent core, and the The skin surface side of the absorbent core is provided with a junction between the absorbent core and the wrapping core, and at least a part of the skin surface side of the absorbent core is provided with a The absorbent polymer compartment defines a region where the superabsorbent polymer is placed.

Description

absorbent article

technical field

The present invention relates to absorbent articles.

Background technique

Superabsorbent polymers (SAP) used in absorbent articles such as diapers may turn yellow or brown due to oxidation in high-temperature, high-humidity environments, and the appearance of absorbent articles may deteriorate. Such a phenomenon tends to occur particularly in subtropical or tropical regions such as Southeast Asia. Therefore, conventionally, the technique of suppressing the discoloration of a superabsorbent polymer using an antioxidant etc. and maintaining the favorable external appearance of an absorbent article has been proposed.

For example, Patent Document 1 describes a technique using acrylic acid or a quinhydrone formation inhibitor with a low content of hydroquinone, and Patent Document 2 describes a technique using a reducing compound and a specific acid (salt). Patent Document 3 describes a technique using a sulfinic acid derivative.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 11-322846

Patent Document 2: Japanese Unexamined Patent Publication No. 2003-52742

Patent Document 3: Japanese PCT Publication No. 2006-521431

Contents of the invention

The technical problem to be solved by the invention

The present invention provides an absorbent article, which has an absorbent body, the absorbent body has an absorbent core, and a wrapping sheet covering the skin surface side and the non-skin surface side of the absorbent core. At least one of the skin side and the non-skin side of the absorbent core is provided with an L ^* value of 40 to 100 and an a ^* value of -12 to 3 in the L ^* a ^* b ^* color system. , b ^* value of the color within the range of -24 to 3, the absorbent core is an aggregate of superabsorbent polymer and pulp fibers, and the absorbent core is placed on the skin side of the absorbent core. In the superabsorbent polymer, on the skin side of the absorbent core, the joining portion between the absorbent core and the wrapping core is arranged, and on at least a part of the skin side of the absorbent core, the The compartment surrounding the superabsorbent polymer by the junction part defines a region in which the superabsorbent polymer is placed.

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

Description of 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 cutaway developed plan view schematically showing a state in which the diaper shown in Fig. 1 is unfolded and stretched after the side seal portion is cut, as seen from the skin surface side.

Fig. 3 is a III-III sectional view of Fig. 2 .

Fig. 4 is a partially enlarged plan view schematically showing an arrangement state of compartments formed by junctions and superabsorbent polymers on the skin surface side of the absorbent core.

In FIG. 5 , (A) is a partially enlarged cross-sectional view showing the layered state of the absorbent core and the members on the skin side and non-skin side of the absorbent core, and (B) is a modification of the figure (A). A partially enlarged cross-sectional view of an example.

It is a plan view which shows the state which arrange|positioned the slit part in the absorptive core.

7 is a cross-sectional view in the thickness direction of the absorptive core, schematically showing a state in which core wraps arranged on the skin surface side and the non-skin surface side of the absorptive core are joined at slits.

Detailed ways

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

In the techniques described in Patent Documents 1 to 3, an expensive superabsorbent polymer containing a discoloration-inhibiting component such as an antioxidant has to be used, and the price of the absorbent article becomes high.

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 drawings.

In the present invention, in the worn state of the absorbent article, the side in contact with the wearer's skin is referred to as the skin side, the skin-contacting side, or the front side, and the opposite side is referred to as the non-skin side. , the non-skin-contacting side or the back side. These terms are also used as terms indicating the relative positional relationship in the component structure of the absorbent article even for components that do not have a surface that comes into contact with the wearer's skin when the absorbent article is worn. In addition, the normal line direction of the front surface or the back surface of an absorbent article is called thickness direction.

As shown in FIG. 1 , the diaper 10 of this embodiment has an absorptive main body 1 and an exterior body 2 . The exterior body 2 has a front exterior body 21 and a rear exterior body 22 respectively corresponding to the front side and the rear side of the wearer. The aforementioned front side refers to the wearer's ventral side, and the aforementioned rear side refers to the wearer's back side. The front side exterior body 21 and the rear side exterior body 22 are horizontally long shape, and each side edge overlaps and joins in the side seal part 11, and forms the ring-shaped waist part 10D of the diaper 10. The part where the absorptive main body 1 extends from the exterior body 2 forms 10 C of intermediate parts of the diaper 10. As shown in FIG. The diaper 10 has the waist opening part 12 opened above the waist part 10D, and the pair of leg opening parts 13 and 13 opened on the left and right sides of 10 C of intermediate parts.

FIG. 2 shows the unfolded state where the diaper 10 is cut off at the side seal portions 11 , 11 . Here, the "expanded state" refers to a state in which each part is stretched to expand the absorbent article into a planar shape.

The diaper 10 is divided into a front side part 10F, a middle part 10C, and a rear side part 10R in an unfolded state. The horizontally long front exterior body 21 and the rear exterior body 22 are arranged in correspondence with each other on the front side part 10F and the rear side part 10R. The vertically long absorptive main body 1 is arrange|positioned so that the longitudinal direction may face the front side part 10F of the diaper 10, 10 C of intermediate|middle parts, and 10 R of rear side parts. In this configuration, the absorbent main body 1 has a longitudinal direction Y corresponding to the direction in which the wearer's front side, crotch portion, and rear side are connected, and a width direction X orthogonal to the longitudinal direction Y.

The absorbent main body 1 constituting the diaper 10, as shown in FIG. Liquid-retaining absorbent body 5 in between. The absorber 5 has the absorbent core 6 which consists of the aggregate of the superabsorbent polymer 67 and the pulp fiber 68, and the core wrap 7 which covers the outer periphery of the absorbent core 6. As shown in FIG. The core pack 7 is made of a hydrophilic material, for example, a hydrophilic paper or nonwoven fabric.

In addition, in this embodiment, a pair of side sheets 9 are provided on both sides in the longitudinal direction Y of the absorptive main body 1 . The three-dimensional gathers 92 are formed by arranging the elastic member 91 formed in an elongated state at the inner end in the width direction X of the side sheet 9 . Moreover, the elastic member 93 formed in the stretched state is arrange|positioned at the outer edge part of the width direction X of the side sheet 9, and the leg gather part 94 is formed. Moreover, in the absorptive main body 1 of this embodiment, the exterior nonwoven fabric 48 is arrange|positioned on the non-skin surface side of the back sheet 4. As shown in FIG.

The absorptive core 6 has the longitudinal direction Y and the width direction X orthogonal to the longitudinal direction like the absorptive main body 1, as shown in FIG. As shown in FIGS. 2 and 3 , the wrapping chip 7 covers the entire length direction Y of the absorbent core 6 and extends in the width direction X, covering the skin side, both sides and the non-skin side (periphery) of the absorbent core 6. ). Specifically, the skin side wrapping chip 71 covers the skin side of the absorptive core 6 , and the non-skin side wrapping chip 72 covers the non-skin side of the absorptive core 6 . The non-skin side wrapping chip 72 further extends in the width direction X and is rolled up toward both sides and the skin side, and is stacked and bonded to the skin faces at both ends of the width direction X of the skin side wrapping chip 71 . This laminated part becomes the laminated part 75 over the entire length of the longitudinal direction Y of the absorptive core 6 at two places of the both ends of the width direction X of the absorptive core 6. As shown in FIG. Although two lamination parts 75 of the core-wrapping part 7 are arrange|positioned on the skin surface side of the absorptive core 6 in FIG. 3, it is not limited to this. For example, they may be arranged on the non-skin side, or one or three or more may be arranged on the non-skin side or the skin side. When one lamination part 75 is arranged on the non-skin surface side of the absorbent core 6, for example, one wrapping chip can be rolled down from the skin surface side of the absorbent core 6 to both sides and the non-skin surface side, so that The way the ends are stacked on top of each other. In this case, in one package chip, the part arranged on the skin surface side of the absorbent core 6 is referred to as the skin surface side package chip 71, and the part arranged on the non-skin surface side of the absorbent core 6 is called Wrap chip 72 for the non-skin side.

As shown in FIG. 3 , superabsorbent polymer 67 is arranged on the skin surface side of absorbent core 6 . The superabsorbent polymer 67 is divided into compartments on the skin surface side of the absorptive core 6 for each compartment divided by the junction part 55 mentioned later. The superabsorbent polymer 67 is preferably uniformly arranged on the skin surface side of the absorptive core 6 . "Uniform" as used herein means that the shedding amount of the superabsorbent polymer 67 located on the skin surface of the absorbent core 6 is measured for each section by the following method, and the shedding amount of each section is compared with the average shedding amount of all sections. The ratio of the amount difference to the average shedding amount of all divisions is expressed as a grammage ratio, and is within ±100%. In addition, the ratio of the fall-off amount of each section to the average fall-off amount of all the above-mentioned sections is expressed as a basis weight ratio, and is preferably within ±50%, more preferably within ±30%.

(Measurement method of distribution of superabsorbent polymer 67 on the skin side of the absorbent core 6)

(1) The absorbent article including the absorber is divided at a position where the absorber is divided into two sections in the horizontal direction and three sections in the vertical direction in plan view.

(2) From the absorptive core located on the skin surface side of one partition, a site on the skin contact surface side (for example, a wrapping chip and a front sheet) is cut out, and the absorptive core is exposed. The exposed part was shaken downward 20 times, and the mass of the detached superabsorbent polymer was measured and converted into gram weight (g/m ² ). Thereby, the influence of the presence or absence of a slit or the difference in area by the shape (for example, hourglass shape) of an absorptive core etc. can be removed, and the fall-off amount of the superabsorbent polymer in each division|region can be compared.

(3) The process of (2) above is performed for each partition. Next, calculate the average shedding amount (in terms of grammage) of all areas based on the measured values of each area, and calculate the difference between the amount of shedding in each area (in terms of grammage) and the average amount of shedding in all the above-mentioned areas (in terms of grammage) The ratio with respect to this average fall-off amount (gram weight conversion). That is, "the fall-off amount of each division-the average fall-off amount of all divisions]/[the average fall-off amount of all divisions" is calculated.

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

And on the skin surface side of the absorptive core 6, the junction part 55 of the absorptive core 6 and the wrapping chip|tip 7 (skin surface side wrapping chip|tip 71) is arrange|positioned as shown in FIG.3 and FIG.4. The bonding portion 55 is formed by applying a bonding agent. As the adhesive, adhesives commonly used for such articles can be used, for example, hot melt adhesives and the like can be used. In addition, the application of the bonding agent can also be performed by a method generally used for such articles. For example, spray coating, gravure coating, etc. can be mentioned. In order to maintain the liquid absorbency and maintain the above-mentioned uniform arrangement of the superabsorbent polymer 67, the adhesive is preferably applied linearly and at intervals on the skin surface of the absorptive core 6, more preferably helically applied. That is, the junction part 55 formed with an adhesive agent is preferably arrange|positioned linearly at intervals with respect to the skin surface of the absorptive core 6, and it is preferable to arrange|position helically.

As shown in FIGS. 3 and 4 , at least a part of the skin surface side of the absorbent core 6 is provided with a compartment 56 surrounding a superabsorbent polymer 67 via a junction 55 . That is, the junction part 55 becomes a partition column which partitions the arrangement|positioning area|region of the superabsorbent polymer 67 on the skin surface side of the absorptive core 6. As shown in FIG.

The compartment 56 has a space 56R vertically sandwiched between the skin surface of the absorptive core 6 and the wrapping chip 7 (skin surface side wrapping chip 71 ) in a region surrounded by the joining portion 55 . In the space 56R which the compartment 56 has, the some superabsorbent polymer 67 is arrange|positioned uniformly in a planar direction. The plurality of compartments 56 are arranged on the skin surface of the absorptive core 6 . Thereby, the arrangement|positioning area|region of the superabsorbent polymer 67 is partitioned on the skin surface side of the absorptive core 6. As shown in FIG.

The migration of the superabsorbent polymer 67 arranged on the skin surface side of the absorbent core 6 can be favorably suppressed by the compartment 56 described above. That is, the joining portion 55 is formed as a partition column, and the superabsorbent polymer 67 is not easily moved between the partitioned compartments 56 , 56 . Usually, 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 under various conditions such as unpacking after purchase and use. In this case, the movement of the superabsorbent polymer 67 is suppressed by the arrangement of the compartments 56 formed by the junction part 55, and the uniformity of the superabsorbent polymer arranged on the skin surface side of the absorbent core 6 is easily maintained. .

Thereby, even if the superabsorbent polymer 67 discolors, it can suppress that the color (for example, yellow or brown) after discoloration becomes lumpy. In addition, the superabsorbent polymer 67 does not form lumps on the skin surface side of the absorbent core 6 but is uniform, so that the rapid absorption of excretion and the absorption of excretion from the skin surface side to the inside of the absorbent core 6 can be achieved. Nicely soaked. Thereby, the absorption performance of the absorptive core 6 whole improves.

A plurality of such compartments 56 are arranged on at least a part of the skin surface side of the absorptive core 6 as described above. As the region where the plurality of compartments 56 are arranged, it is preferable to place the superabsorbent polymer 67 in an absorbent body from the viewpoint of maintaining the uniform arrangement of the superabsorbent polymer 67, making the discolored color (for example, yellow or brown) inconspicuous, and achieving high liquid absorbency. Within the range of 1/3 of the absorber, more preferably within the range of 3/4 of the absorber, and even more preferably within the entire area of the absorbent core 6 on the skin side. It is preferable to include a liquid receiving region described later in the range of 1/3 of the absorbent body and the range of 3/4 of the absorbent body.

It is preferable that the said compartment 56 forms a row|line in the longitudinal direction Y of the absorptive core 6, and it is preferable that this row is arrange|positioned in 3 or more rows in the width direction X. Thereby, the movement to the width direction X of the superabsorbent polymer 67, deviation, and falling-off can be suppressed effectively, and a uniform arrangement|positioning can be maintained. From such a viewpoint, it is more preferable that the above-mentioned rows are arranged in four or more rows in the width direction X, and it is still more preferable that they are arranged in five or more rows. In addition, the above-mentioned rows are preferably arranged in 10 or less rows in the width direction X, more preferably 8 or less rows, and still more preferably 6 or less rows, from the viewpoint of not hindering the absorption performance. Specifically, the above-mentioned rows are preferably arranged in the width direction X from 3 to 10 rows, more preferably from 4 to 8 rows, and even more preferably from 5 to 6 rows.

In addition, the number of the above-mentioned compartments 56 in one row (the number in the longitudinal direction Y) is from the viewpoint of effectively suppressing the movement, deflection, and fall-off of the superabsorbent polymer 67 in the longitudinal direction Y and maintaining a uniform arrangement. The number is preferably 5 or more, more preferably 10 or more, and still more preferably 20 or more. In addition, the number of the above-mentioned compartments 56 in one row (the number in the longitudinal direction Y) is preferably 100 or less, more preferably 50 or less, and still more preferably 30 or more, from the viewpoint of ensuring absorption performance. Specifically, the number of the compartments 56 in one row (the number in the longitudinal direction Y) 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 less than 30.

The compartment 56 has a planar shape edged by the linear joint portion 55 , and this planar shape can be formed in various shapes. For example, a circle, an ellipse, a polygon, etc. can be mentioned. In particular, in order to maintain the uniform arrangement of the superabsorbent polymer 67, the movement between the compartments 56 and 56 of the superabsorbent polymer 67 is suppressed, and condensation is less likely to occur on the skin side of the absorbent core 6 during liquid absorption. From the standpoint of glue clogging, the planar shape of the compartment 56 is preferably circular or elliptical. From this point of view, the joining portion 55 is preferably arranged in a spiral shape. By arranging the joining portion 55 in a spiral shape, the above-mentioned circular or elliptical compartments 56 can be arranged without gaps, and the superabsorbent polymer 67 can be uniformly arranged efficiently.

The line width of the linear joining portion 55 is preferably 5 mm or less, more preferably 3 mm or less, and still more preferably Below 1mm. In addition, from the viewpoint of suppressing the movement between the compartments 56 and 56 of the superabsorbent polymer 67, the line width of the linear junction 55 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 or more. Specifically, the line width of the linear bonding portion 55 is preferably from 0.1 to 5 mm, more preferably from 0.3 mm to 3 mm, and still more preferably from 0.5 mm to 1 mm.

Furthermore, when the diaper 10 is used, from the viewpoint of suppressing the drop-off of the superabsorbent polymer 67 and maintaining the uniform arrangement of the superabsorbent polymer 67, it is preferable that the joint portion 55 constituting the above-mentioned compartment 56 is also arranged on the absorbent side. The outer edge 69 of the skin side of the core 6 (see FIGS. 3 and 6). The "outer edge 69 of the skin surface of the absorptive core 6" here means the edge part along the outer periphery of the absorptive core 6 seen when the absorptive core 6 is planarly viewed from the skin surface side. In this case, it is preferable that the joint portion 55 exists in at least a part of the outer edge 69 . For example, the ratio of the junction part 55 arrange|positioned with respect to the full length of the outer edge 69 of the skin surface of the absorptive core 6 is 5 % or more, Preferably it is 20 % or more, More preferably, it is 50 % or more. The larger the above ratio, the better. Specifically, the above ratio is preferably 5% to 100% inclusive, preferably 20% to 100% inclusive, more preferably 50% to 100% inclusive.

The basic weight of the joint part 55 on the skin surface side of the absorbent core 6 (the basic weight of the joint agent forming the joint part 55 ) is obtained from maintaining the liquid absorbency of the absorbent core 6 and maintaining the uniform arrangement of the superabsorbent polymer 67 From the standpoint of this, it is preferably 20 g/m ² or less, more preferably 15 g/m ² or less, even more preferably 10 g/m ² or less. In addition, the basis weight of the joint part 55 on the skin surface side of the absorbent core 6 ensures the joint strength between the absorbent core 6 and the skin surface side wrapping chip 71 and suppresses the gap between the compartments 56 and 56 of the superabsorbent polymer 67. From the viewpoint of the movement of , it is preferably 1 g/m ² or more, more preferably 3 g/m ² or more, and even more preferably 5 g/m ² or more. Specifically, the basis weight of the joint portion 55 on the skin surface side ^of the absorbent core 6 is preferably 1 g/m ² to 20 g/m 2 , more preferably 3 g/m ² to 15 g/m ² , and even more preferably It is 5 g/m ² or more and 10 g/m ² or less.

(Measurement method of the basis weight of the joint portion 55 on the skin surface side of the absorbent core 6)

The area of the non-skin surface side of the wrapping core 7 and the skin surface side of the absorptive core 6 where the adhesive is applied (the portion where the bonding portion 55 is arranged) is drawn from the skin surface side of the wrapping chip 7 to a predetermined thickness (impregnated with The thickness of the cement. For example, the thickness of 5mm.) Cut, remove the pulp fiber and superabsorbent polymer. A bonding agent (for example, a hot-melt adhesive) was extracted from the above-mentioned application part using a solvent, and the extracted solution was dried and solidified under reduced pressure using a rotary evaporator, and the mass of the obtained bonding agent was measured.

The measured mass of the bonding agent was divided by the area of the portion extending from the widthwise end and the longitudinal end of the application portion to calculate the basic weight of the bonding portion 55 on the skin surface side of the absorptive core 6 .

In addition, as said solvent, it can select suitably according to the kind of bonding agent etc. When the adhesive to be measured is, for example, a hot-melt adhesive, examples of the solvent include toluene, methyl ethyl ketone, and heptane.

In addition, the basis weight of the superabsorbent polymer 67 arranged on the skin side of the absorbent core 6 is preferably 10 g from the viewpoint of maintaining the liquid absorbency of the absorbent core 6 and making the color after discoloration inconspicuous. /m ² or more, more preferably 20 g/m ² or more, still more preferably 30 g/m ² or more. In addition, the basis weight of the superabsorbent polymer disposed on the skin surface side of the absorbent core 6 is preferably 100 g/m ² or less, more preferably 80 g/m ² or less, even more preferably 60 g/m ² or less. Specifically, the basis weight of the superabsorbent polymer disposed on the skin side of the absorbent core 6 is preferably 10 g/m ² to 100 g/m ² , more preferably 20 g/m ² to 80 g/m ² Below, more preferably 30 g/m ² or more and 60 g/m ² or less.

Furthermore, in the diaper 10, at least one of the skin surface side and the non-skin surface side of the absorbent core 6 is arranged with an L ^* value in the L ^* a ^* b ^* color system: 40 or more and 100 or less, a ^* Value: not less than -12 and not more than 3, b ^* value: a member of a color in the range of not less than -24 and not more than 3. In the above-mentioned color, in the L ^* a ^* b ^* color system, L ^* value: 60 to 80, a ^* value: -9 to 0, b ^* value: -15 to -6, more preferably L ^* Value: 65 to 75, a ^* value: -6 to -3, b ^* value: -12 to -9. In this specification, the above-mentioned color is also referred to as "covering color" because it exists in a member that overlaps from above on the skin side or the non-skin side side compared with the arrangement position of the superabsorbent polymer 67 . In addition, the L ^* a ^* b ^* color system is specified in JIS-Z-8729, L ^* indicates lightness, and a ^* and b ^* indicate the direction of color. Each value is expressed in a value from positive to negative. The larger the value of L ^* , the brighter it is. Regarding a ^* , a positive value indicates a reddish direction, and a negative value indicates a greenish direction. Regarding b ^* , a positive value indicates a yellowish direction, and a negative value indicates a bluish direction.

The above-mentioned overlay color is a color within the range of a complementary color relationship with the discolored color (for example, yellow or brown) of the superabsorbent polymer 67 . When the colors in the complementary color relationship are viewed from the outside, the diaper 20 appears to overlap. That is, it appears to be color mixing. As a result, from the outside of the diaper 10, especially from the skin surface side, the saturation of the discolored color of the superabsorbent polymer 67 decreases and becomes inconspicuous. More specifically, in the overlapping of fibrous members such as non-woven fabrics, filler members, and other members that easily transmit light, the discolored color of the superabsorbent polymer 67 is also projected to the outside. overlay color. Thereby, the colors in the complementary color relationship are seen from the outside of the diaper 10 to mix colors, and the chroma of the color after the discoloration of the superabsorbent polymer 67 is lowered and becomes inconspicuous.

In addition, since the superabsorbent polymer 67 on the skin surface side of the absorbent core 6 is uniformly arranged in the planar direction, the discolored color does not appear to be lumped and dispersed in the above-mentioned covering color. Therefore, when the diaper 10 is seen from the outside, especially when seen from the skin surface side, it can avoid that the colors which are in a complementary color relationship block and look adjacent to each other. Usually, when the colors in a complementary color relationship are adjacent to each other in a block, the chroma is emphasized, but the arrangement as described above prevents the chroma of such complementary colors from being emphasized. From this viewpoint, the superabsorbent polymer 67 is preferably arranged uniformly as described above.

In addition, since there are members having the above-mentioned covering color, it is preferable that the superabsorbent polymer 67 has a good appearance from the initial stage of use regardless of the degree of discoloration of the superabsorbent polymer 67 .

(Measurement method of each value of L ^* a ^* b ^* color system in covering color)

The parts to be measured are taken out from the absorbent article and measured. Specifically, after weakening the bonding agent or the like used for bonding the member to be measured and another member by cooling methods such as cold spray, the member to be measured is carefully peeled and taken out.

A white sheet is laid on the bottom, and measurement is performed using a color difference meter such as a simple spectrocolor difference meter NF333 (trade name) manufactured by Nippon Denshoku Kogyo Co., Ltd. In the measurement method based on the above-mentioned simple spectrocolorimeter NF333, the stapler (Stapler) type is installed 4mm ND110 sensor, using an O-ring (small) at the front end of the sensor, light source C/2, and measuring with a viewing angle of 2°.

During the measurement, the sensor unit of the color difference meter is directly in contact with the measurement site of the component to be measured, and the measurement is performed.

As a member on the skin side having a covering color, as shown in FIG. 5(A) , the front sheet 3 and the skin side wrapping chip 71 can be exemplified. Furthermore, as shown in FIGS. 2 and 3 , side panels 9 partially overlapping the absorptive core 6 are also included. Moreover, as shown in FIG.5(B), when the intermediate member 35 exists between the surface sheet 3 and the absorber 5, the intermediate member 35 is also included. The intermediate member 35 is preferably composed of a hydrophilic fiber material that has a function of spreading the excrement permeating through the top sheet 3 in the planar direction and quickly absorbing it on a wide surface of the absorber 5 .

In addition, the back sheet 4 , the non-skin side wrapping chip 72 , and the exterior nonwoven fabric 48 can be exemplified as members that arrange the non-skin side of the covering color. Furthermore, as shown in FIGS. 1 and 2 , the above-mentioned exterior body 2 is also included in the non-skin surface side members.

The overlay color may be arranged on one of the parts on the skin side and the non-skin side, or on two or more parts. When two or more members are provided with overlay colors, the above-mentioned visual effect is better, so it is preferable. For example, it is preferable that covering colors are arranged in one member or two or more members on both the skin side and the non-skin side.

From the viewpoint of making the cover color easy to match with the discolored color of the superabsorbent polymer 67 (each value of the L ^* a ^* b ^* color system) and from the viewpoint of making the above-mentioned visual effect more effective, it is preferable that The parts where the superabsorbent polymer 67 is close to are provided with overlay colors. For example, the order of priority for arranging the parts covering the color on the skin side is the order of the skin side wrapping chip 71 , the middle member 35 , the front sheet 3 , and the side sheet 9 . In addition, the order of priority for arranging the covering color components on the non-skin side is the order of the non-skin side wrapping chip 72 , the back sheet 4 , the exterior nonwoven fabric 48 , and the exterior body 2 . It is preferable that covering color is arranged on at least the wrapping chip 7 on either the skin side or the non-skin side. It is particularly preferable that covering chips 71 are arranged with covering colors at least on the skin side.

In addition, the overlay color may be arranged on the whole part, or may be arranged on a part. When arrange|positioning in a part, it is preferable to arrange|position in the interior including the area|region which overlaps with the absorptive core 6. In consideration of accidental detachment of the superabsorbent polymer 67, etc., it is preferable to arrange the overlay color on the entire member.

When the above-mentioned intermediate member 35 is present as a member on the skin surface side of the absorptive core 6, the above-mentioned covering color may be arranged on the intermediate member 35, or may not be arranged. If there is no placement, the overlay color is placed on other parts on the skin side (for example, pack chips). The intermediate member 35 can keep the discolored color of the superabsorbent polymer 67 away from the skin surface side of the diaper 10 even when the color is not covered. In this way, in combination with the above-mentioned effect caused by the covering color of other components, the chroma of the color of the superabsorbent polymer 67 when viewed from the outside (skin surface side) of the diaper 10 is further reduced, and the chromaticity of the color of the superabsorbent polymer 67 can be further improved. Its unobtrusive effect.

In addition, when the above-mentioned overlay color is not arranged on the intermediate member 35, it is preferable to arrange an achromatic color having an L ^* value of 50 or more and 80 or less, that is, gray. Thereby, the discolored color of the superabsorbent polymer 67 can be made less conspicuous. Generally, the saturation of the color can be reduced by overlapping the gray, and the color-changing part of the polymer can be overlapped with the overlay color, and the gray can be superimposed on the part where the saturation is lowered, so that the color-changing part can be made less conspicuous.

As mentioned above, in the diaper 10, the superabsorbent polymer 67 is arrange|positioned on the skin surface side of the absorptive core 6, and the member which has the said covering color is arrange|positioned. In the state before use of the diaper 10, the L ^* value of the absorber 5 of the diaper 10 viewed from the skin side is preferably 85 or less, more preferably 80 or less, and even more preferably 75 or less. Thus, the appearance of the polymer before and after discoloration is less likely to be damaged. In addition, the L ^* value seen from the skin side of the diaper 10 is preferably 60 or more, more preferably 65 or more, and even more preferably 70 or more. Thereby, while ensuring the effect of not impairing the appearance of the polymer before and after discoloration, it is possible to suppress the appearance of being blackened before use. Specifically, in the state before use of the diaper 10, the L ^* value viewed from the skin side of the diaper 10 is preferably 60 to 85, more preferably 65 to 80, and still more preferably 70 to 75. the following.

In addition, the said L ^* value seen from the skin surface side of the diaper 10 can be measured with the simple spectrocolorimeter NF333 (brand name) by Nippon Denshoku Kogyo Co., Ltd., for example.

Moreover, in the diaper 10, in the absorptive core 6, it is preferable that the basis weight of the superabsorbent polymer 67 increases as it goes from the non-skin surface side to the skin surface side. In addition, the superabsorbent polymer 67 mentioned here includes the polymer mixed with the pulp fiber 68 in the absorptive core 6 and the polymer arrange|positioned on the skin surface side of the absorptive core 6. As shown in FIG.

The above-mentioned "more" means that when the absorbent core 6 is viewed from the thickness direction, the layer near the skin side contains relatively more superabsorbent polymer 67 than the layer near the non-skin side, The amount is expressed in grams. The unevenness of the superabsorbent polymer 67 may gradually increase from the non-skin side to the skin side, or may increase stepwise. At least the outermost layer on the non-skin surface side of the absorbent core 6 is preferably contained in a larger amount of superabsorbent polymer 67 in the outermost layer on the skin surface side than the outermost layer on the skin surface side. Thereby, together with the above-mentioned superabsorbent polymer 67 disposed on the skin surface side of the absorbent core 6, high absorption capacity of the diaper 10 can be ensured, and rapid absorption and leakage resistance can be improved.

In addition, from the same viewpoint, 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 absorptive core 6 is divided into the front part 61 located on the skin surface side and the back part 62 located on the non-skin surface side in the thickness direction. This division is performed by dividing the absorptive core 51 into two equal parts in the thickness direction. At this time, the basis weight of the superabsorbent polymer 67 in the front portion 61 is preferably 40 g/m ² or more, more preferably 60 g/m ² or more, and still more preferably 80 g/m ² or more. In addition, the basis weight of the superabsorbent polymer 67 in the front portion 61 is preferably 250 g/m ² or less, more preferably 200 g/m ² or less, from the viewpoint of preventing gel blocking due to an increase in polymer density. , and more preferably 150 g/m ² or less. Specifically, the basis weight of the superabsorbent polymer 67 in the front portion 61 is preferably 40 g/m ² to 250 g/m 2 , more preferably 60 g/ ^{m 2 to} 200 g/m ² , even more preferably 80g/m2 or ^more and 150g/ ^m2 or less.

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

First, the cross section of the portion to be measured of the absorptive core 6 is observed with a microscope and divided into two in the thickness direction, and each site of the front part 61 and the back part 62 is collected.

Based on the quantification method of fibers and/or water-absorbing polymers described in Japanese Patent No. 4225821, the mixture of superabsorbent polymer 67 and pulp fiber 68 was quantified for each part to be collected, and the superabsorbent properties were calculated. The mass of polymer 67.

Specifically, the molecular weight of the superabsorbent polymer 67 was reduced in each site after measuring the mass of each sampled site. The molecular weight reduction of the superabsorbent polymer 67 can be performed by ultraviolet irradiation. At this time, the collected mixture of superabsorbent polymer 67 and pulp fiber 68 is immersed in an aqueous solution containing ascorbic acid and riboflavin in a mesh bag or the like. After the superabsorbent polymer is swelled by immersion, the mesh bag is taken out from the aqueous solution, and the above-mentioned ultraviolet irradiation is performed to reduce the molecular weight of the superabsorbent polymer 67 . Next, components generated by lowering the molecular weight are removed by washing with water. After the removed mesh bag was fully washed with water, it was dehydrated and dried, and its mass was measured. The mass of the pulp fiber 68 was calculated by subtracting the mass of the net bag monomer from the measured mass, and the mass of the superabsorbent polymer 67 was obtained by subtracting the mass of the pulp fiber 68 from the mass of each position measured initially. Based on dividing the obtained value by the area of each site, the basis weight of the superabsorbent polymer 67 at each site was obtained. The average value obtained by carrying out the said measurement three times was made into the basis weight of the superabsorbent polymer 67 in each site|part of the front part 61 and the back part 62.

Furthermore, in the diaper 10, it is preferable that the absorber 5 has the compressed part (not shown) formed by applying a certain amount of compression in the thickness direction by embossing etc.. Thereby, it can avoid that the superabsorbent polymer 67 moves to the position (for example, the edge part of the absorptive core 6) where the color after discoloration is conspicuous.

In the compressed portion, the pulp fibers 68 are compressed, whereby the movement of the superabsorbent polymer 67 is easily restricted. As long as it plays such a role, the depth of the compressed portion can be appropriately set, and may be a depth reaching the back surface portion 62 of the absorptive core 6 . From the viewpoint that the absorbency of the superabsorbent polymer 67 is not hindered by compression, it is preferable to form a compressed portion at the skin surface side of the absorber 5 as deep as the front portion 61 of the absorptive core 6 . Moreover, it is preferable that the said compressed part exists only in the front part 61, and does not reduce the softness of the absorptive core 6 from a viewpoint. The compressed portion can be formed linearly in the planar direction of the absorber 5 on the skin surface side of the absorber 5 including the absorptive core 6 and the wrapping core 7 , for example. As a linear compression part, the structure arrange|positioned in the form of a diagonal lattice with respect to the longitudinal direction Y and the width direction X can be mentioned, for example. The shape of the compression part is not particularly limited as long as the above-mentioned function can be achieved, and other than the above-mentioned oblique lattice shape, a zigzag shape and a wave shape can be exemplified. In addition, the compression part is not limited to the case where only the absorber 5 is provided, For example, the structure which compresses the absorber 5 and the surface sheet 3 integrally may be sufficient.

Moreover, in the diaper 10, it is preferable to arrange|position the slit part 8 in the absorptive core 6, as shown in FIG. The slit portion 8 is a space portion formed in the thickness direction from the skin surface side in the absorptive core 6 in which the amount of pulp is smaller than that of the periphery. The slit portion 8 may be a notch-shaped portion, or may be a groove having a predetermined width. In the arrangement position of the slit portion 8 , the excrement liquid easily permeates the thickness direction of the absorptive core 6 . Thereby, in the diaper 10, rapid liquid absorption retention and moisture repellency can be improved. That is, it is possible to achieve the above-mentioned rapid liquid absorption retention and improvement of moisture repellency, and to make discoloration of the superabsorbent polymer 67 inconspicuous at the same time.

The slit portion 8 preferably has a depth from the skin surface side of the absorbent core 6 to the back surface portion 62, more preferably from the skin surface side of the absorbent core 6 to Through holes on the non-skin side. And it is preferable that the slit part 8 exists in the liquid receiving area|region Q of the absorptive core 6 from the viewpoint similar to the above.

The "fluid receiving area Q" as used herein refers to an area that directly receives excreted fluid such as urine. In the diaper 10, the liquid receiving area Q is an area within 3.5 cm in the left and right width direction from the line S1 that bisects the length in the width direction X, and is an area from the line that bisects the length in the longitudinal direction Y. The area from M1 within 8 cm in the anterior direction. In addition, when the absorbent article of the present invention is a sanitary napkin for daily use, the liquid-receiving region Q is the middle part that divides the absorbent core 6 into three equal parts in the longitudinal direction Y, and is formed from the center part of the middle part. The area within 2.5 cm in the left and right width direction from the line that divides the length X in the width direction into two equal parts. When the absorbent article of the present invention is a sanitary napkin for night use or the like having a wide rear flap covering the buttocks, the second part when divided into four equal parts in the longitudinal direction Y, and from the A region within 2.5 cm in the left and right width direction from a line bisecting the length of X in the width direction is the liquid receiving region Q. Moreover, when the absorbent article of this invention is a urine collection pad or an incontinence pad, it sets similarly to the diaper 10.

In FIG. 6 , the slits 8 have a length extending from the liquid receiving area Q to the front and rear in the longitudinal direction Y, and three slits 8 are arranged side by side in the width direction X. As shown in FIG. The arrangement and number of slits 8 are not limited thereto, and the form shown in FIG. 6 is preferable from the viewpoint of improving the above-mentioned liquid absorption retention and moisture repellency.

When there are a plurality of slit portions 8, the widths of the respective slit portions 8 (referred to as the groove width, and defined as the length in the width direction X) may be the same as or different from each other. When the widths of the respective slits 8 are the same, it is easy for the excrement to diffuse uniformly and quickly in the absorptive core 6 . Thereby, since the wider area|region of the absorptive core 6 can fully be used for liquid absorption, it is preferable. From the viewpoint of making this effect more remarkable, the width of each slit portion 8 is preferably 1 mm or more, and more preferably 3 mm or more. In addition, the width of each slit portion 8 is preferably 20 mm or less, more preferably 15 mm or less. Specifically, the width of each slit portion 8 is preferably not less than 1 mm and not more than 20 mm, more preferably not less than 3 mm and not more than 15 mm. Moreover, even when the width of each slit part 8 differs from each other, it is preferable that the width of each slit part 8 exists in the said range.

When there are a plurality of slit portions 8, the lengths of the respective slit portions 8 (the length in the longitudinal direction Y) may be the same as or different from each other. When the lengths of the respective slits 8 are the same, the excrement can easily spread uniformly and quickly in the absorbent core 6 . Thereby, since the wider area|region of the absorptive core 6 can fully be used for liquid absorption, it is preferable. From the viewpoint of making this effect more remarkable, the length of each slit portion 8 is preferably 50 mm or more, and more preferably 100 mm or more. In addition, the length of each slit portion 8 is preferably 350 mm or less, more preferably 300 mm or less. Specifically, the length of each slit portion 8 is preferably not less than 50 mm and not more than 350 mm, more preferably not less than 100 mm and not more than 300 mm. In addition, even when the lengths of the respective slits 8 are different from each other, it is preferable that the lengths of the respective slits 8 are within the above range.

The length of each slit portion 8 is preferably formed as follows when dividing the absorptive core 6 into three equal parts in the longitudinal direction Y and dividing it into the front portion F, the middle portion C, and the rear portion R.

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

Preferably, each slit portion 8 does not exist in the rear portion R. As shown in FIG. Thereby, the balance of the liquid absorption power of the absorptive core 6, the liquid diffusivity in the absorptive core 6, and the favorable wearing feeling of the diaper 10 can be achieved. In particular, the distance between the end T2 on the rear portion R side of each slit portion 8 and the boundary position T3 between the intermediate portion C and the rear portion R in the absorbent core 6 is preferably 5 mm or more, more preferably 10 mm. In addition, it is preferably 50 mm or less, more preferably 45 mm or less. Specifically, the distance between the end T2 on the rear R side of each slit 8 and the boundary position T3 is preferably 5 mm to 50 mm, more preferably 10 mm to 45 mm. As a result, diffusion of liquid in the high grammage region becomes easier to occur. Moreover, the absorptive core 6 bends and deforms easily, and the wearing feeling of the diaper 10 becomes more favorable.

In particular, when each slit portion 8 does not exist in the absorbent core 6 on the rear portion R side than the position corresponding to the wearer's stool excretion portion, excreted feces are less likely to adhere to the wearer's skin, so it is preferable . It can be said that the position of the end T2 on the rear part R side of all the slits 8 is biased towards the front side F than the position corresponding to the wearer's stool excretion part. F).

For the slit 8 as described above, in addition to the method of applying a cut to the absorbent core 6, it is also possible to provide an air-impermeable slit at the position where the slit 8 should be formed in the gathering recess arranged on the outer peripheral surface of the rotating drum. convex part to manufacture.

In addition, regarding the slit portion 8, as shown in FIG. 7, it is preferable that the wrapping chips 7 arranged on the skin side and the non-skin side of the absorbent core 6 (the skin side wrapping chip 71 and the non-skin side wrapping chip 72) It is joined at the position of the slit portion 8 . That is, it is preferable that the skin side wrapping chip 71 and the non-skin side wrapping chip 72 enter the slit portion 8 from both sides of the absorptive core 6 and be joined. In this case, the slit portion 8 is more preferably a through hole. It is more preferable that the joint is formed so as not to peel off even when it is wetted with excrement. This makes it difficult for the superabsorbent polymer 67 to move to the position of the slit of the absorber 5, and it becomes difficult for the discolored superabsorbent polymer 67 to be seen from the outside. In addition, the bonding of the package chips 71 and 72 can be performed by various methods for realizing the above-mentioned functions.

Next, each member which comprises the diaper 10 is demonstrated.

(Absorber 5)

As the liquid-retentive absorbent body 5, any absorbent body used for such a diaper can be arbitrarily adopted without particular limitation as long as the effect of the present invention can be exhibited.

The absorber 5 preferably contains synthetic fibers. Specific examples of synthetic fibers include polypropylene fibers, polyethylene fibers, and polyester fibers. Moreover, among the absorbent core 6 and the core wrapping 7 which comprise the absorber 5, it is preferable to contain synthetic fiber at least in the absorbent core 6, and it is more preferable to contain synthetic fiber in both the absorptive core 6 and the core wrap 7. Since the absorbent body 5 contains synthetic fibers, it is less likely to collapse even when exposed to excrement fluid. As a result, it is possible to suppress the discolored superabsorbent polymer 67 from being seen from the gap of the deformed absorber 5 .

In the absorptive core 6, it is preferable that the superabsorbent polymer 67 has a larger surface area toward the skin side. When the superabsorbent polymer 67 has a large surface area, it tends to appear whiter due to diffuse reflection of light. Thereby, even if the superabsorbent polymer 67 in the vicinity of the skin surface changes color, it is easy to make the diaper 10 look whiter when viewed from the skin surface side.

In addition, the absorber 5 may have an antioxidant. Specific examples of antioxidants include triethylene glycol-bis-[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenylpropionate and Hindered phenolic antioxidants such as 3,5-di-tert-butyl-4-hydroxybenzylphosphonate-diethyl ester, and amines such as n-butylamine, triethylamine and diethylaminomethyl methacrylate Antioxidant, etc. Antioxidant can be contained in any one of the absorbent core 6 and the wrapping core 7 constituting the absorbent body 5, and can also be contained in both. For example, it can be contained in the synthetic fiber in the absorbent body. , can also be contained in the hot-melt adhesive. However, this may be the case where the superabsorbent polymer contains an antioxidant, or it may not be contained. Thus, without using a component that inhibits discoloration In the case of high-priced superabsorbent polymers, that is, even if ordinary superabsorbent polymers are used, combined with the action based on the structure of the absorbent core 6 described above, the loss of superabsorbent polymers can be suppressed. Discoloration, even if it is discolored, it can be made inconspicuous when viewed from the outside of the diaper 10 .

(front panel 3)

The topsheet 3 is liquid-permeable, and the topsheet used for such a diaper can be used without particular limitation. From the viewpoint of allowing excreted bodily fluids to quickly pass through and move to the absorber, and to provide a good touch to the skin, a hydrophilic heat-bonded nonwoven fabric is preferred, and an air-through nonwoven fabric is particularly preferred. It is preferably a thermoplastic resin fiber after a hydrophilization treatment, and the fiber is a three-dimensionally crimped fiber such as a double crimp or a triple crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are produced, cut into predetermined lengths, and various hydrophilizing agents are applied before forming staple fibers (staples). A hydrophilization treatment based on a hydrophilizing agent known to those skilled in the art can be used. Among them, as the hydrophilizing agent, various alkylsulfonates represented by α-alkenylsulfonates, acrylates, Acrylate/acrylamide copolymer, ester amide, salt of ester amide, polyethylene glycol and its derivatives, water-soluble polyester resin, various silicone derivatives, various sugar derivatives and their mixtures, etc.

The top sheet 3 preferably has a concavo-convex structure. When the topsheet 3 of the concave-convex structure is disposed on the skin side of the absorber, diffuse reflection of light tends to occur on the skin side of the topsheet 3, and the diaper 10 tends to look white when viewed from the skin side. As a result, the discolored superabsorbent polymer 67 is not easily seen from the outside.

It is preferable that a color tone changing agent is mixed with the fiber which comprises the surface sheet 3. The color tone changing agent is a component which has the function of reducing the transmittance of the light incident on the top sheet 3 and scattering it. By mixing the color tone changing agent with the constituent fibers of the top sheet 3, the discolored superabsorbent polymer 67 is less likely to be seen from the skin side.

Specific examples of the color tone changing agent include inorganic powders, organic powders, and the like having a different refractive index from the constituent fibers of the surface sheet 3 .

Examples of the inorganic powder include titanium oxide, porous silica (silica), porous silica, alumina, lime, and clay minerals. Examples of clay minerals include swelling clay minerals (smectite), montmorillonite, bentonite, kaolinite, sericite, illite, aquamarine, chlorite, zeolite, talc, and Mizukanite.

Examples of organic powders include polyethylene powder, polyester powder, polypropylene powder, polyacrylic acid powder, polyacrylate powder, cellulose powder, viscose powder, silk powder, silicone compound Powder, fluorine compound powder, etc. Moreover, what colored these organic powders with a pigment can be mentioned. Among them, titanium oxide is preferably used as the color tone changing agent.

The blending amount of the color tone changing agent is preferably 0.1% by mass or more, more preferably 1% by mass or more, and still more preferably 3% by mass or more, when the entire constituent fibers of the topsheet 3 are 100% by mass. By mixing titanium oxide in a certain amount or more with the constituent fibers of the top sheet 3, light can be efficiently scattered. On the other hand, the upper limit of the blending amount of titanium oxide to the fibers constituting the top sheet 3 is not particularly limited as long as the effect of the present invention can be achieved, but is actually 10% by mass or less.

(back sheet 4)

For the back sheet 4, a moisture-permeable film alone, a composite sheet obtained by laminating a film or a nonwoven fabric, or a water-repellent nonwoven fabric (SMS, SMMS, etc.) can be used. It is preferable to use a separate moisture-permeable membrane as a leak-proof member in terms of cost or compatibility with the offset-preventing adhesive. As the film member at this time, a film obtained by melt-kneading and extruding a thermoplastic resin and an inorganic filler incompatible therewith can be exemplified, and a film having micropores opened in a predetermined size, or a film that is substantially incompatible with water A relatively high, non-porous membrane capable of releasing water vapor like a permeable membrane.

It is preferable that the above-mentioned overlay color is arranged on the back sheet 4 . It is preferable that the position of this overlay color overlaps with the position where many superabsorbent polymers 67 exist in the absorptive core 6 when the absorptive core 51 is planarly viewed. In particular, when a cute character such as a rabbit or a cat is printed on the back sheet 4 as the above-mentioned overlay color, the discoloration of the superabsorbent polymer 67 becomes less conspicuous from the back sheet 4 side, and at the same time, the color of the diaper 10 can be more attractive. Demanders, so preferred.

Moreover, as the exterior body 2 which comprises the diaper 10, the side panel 9, the elastic member arrange|positioned in these, the exterior nonwoven fabric 48, and the intermediate|middle member 35, various materials normally used for this kind of article can be employ|adopted.

As described above, since the discoloration of the superabsorbent polymer 67 is not easily seen from the outside, the diaper 10 of the present embodiment can maintain a good appearance even without using a superabsorbent polymer containing a discoloration-inhibiting component. .

The diaper 10 of the present embodiment is shown as an underpants type diaper, but is not limited thereto, and may be an adhesive tape type diaper. Moreover, in the diaper 10 of this embodiment, although the structure which separated the exterior body into the front side and the back side was shown, it is not limited to this, The structure of various shapes can be employ|adopted. For example, the exterior body is formed in a shape covering the entire front portion 10F, middle portion 10C, and rear portion 10R of the diaper 10 , and is formed in a shape narrowed in the width direction in the middle portion 10C of the diaper 10 . Also about the shape of the absorptive core 6, it is not limited to the shape of this embodiment, Various shapes can be employ|adopted. For example, the planar shape of the absorptive core 6 may be the shape shrunk in the width direction X in the middle part C.

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

The present invention further discloses the following absorbent articles regarding the above-mentioned embodiment.

<1>

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

At least one of the skin surface side and the non-skin surface side of the absorbent core is provided with an L ^* value of 40 to 100 and an a ^* value of -12 or more in the L ^* a ^* b ^* color system. and 3 or less, and the b ^* value is in the range of -24 or more and 3 or less color parts,

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

On the skin surface side of the absorptive core, a joint portion between the absorptive core and the wrapping chip is arranged, and at least a part of the skin surface side of the absorptive core is disposed surrounded by the absorptive core. The compartment for the superabsorbent polymer defines a region where the superabsorbent polymer is disposed.

<2>

In the absorbent article according to the above <1>, the basic weight of the junction portion on the skin surface side of the absorbent core is 3 g/m ² or more and 10 g/m ² or less.

<3>

In the absorbent article described in the above <1> or <2>, the junction part is arranged in a spiral shape.

<4>

In the absorbent article described in any one of <1> to <3> above,

The absorbent core has a length direction corresponding to a pair of directions connecting the wearer's front side, crotch portion, and back side, and a width direction orthogonal to the length direction,

The compartments surrounding the superabsorbent polymer form a row in the longitudinal direction, and three or more of the rows are arranged in the width direction.

<5>

In the absorbent article described in any one of <1> to <4> above,

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

<6>

In the absorbent article described in any one of <1> to <5> above,

When the absorbent core is divided in the thickness direction into a front part on the skin side and a back part on the non-skin side, the basis weight of the superabsorbent polymer in the front part is 40 g/m ² or more.

<7>

In the absorbent article described in any one of <1> to <6> above,

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

<8>

In the absorbent article described in <7> above,

The intermediate member is an achromatic color having an L ^* value of 50 or more and 80 or less shown in the L ^* a ^* b ^* color system.

<9>

In the absorbent article described in any one of <1> to <8> above,

The L ^* value of the absorber viewed from the skin side of the absorbent article in the L ^* a ^* b ^* color system is 85 or less.

<10>

In the absorbent article described in any one of <1> to <9> above,

The absorbent body has a compression portion.

<11>

In the absorbent article described in any one of <1> to <10> above,

A slit is disposed in the absorbent core, and the wrapping cores disposed on the skin surface side and the non-skin surface side of the absorbent core are joined to each other in the slit.

<12>

In the absorbent article described in any one of <1> to <11> above,

In the absorbent core, the surface area of the superabsorbent polymer increases toward the skin side.

<13>

In the absorbent article described in any one of <1> to <12> above,

On the non-skin surface side of the absorber, a back sheet having the L ^* value of 40 to 100 and the a ^* value of -12 in the L ^* a ^* b ^* color system is disposed on the back sheet. A member having a color within a range of not less than 3 and not more than -24 and not more than 3 with a b ^* value.

<14>

In the absorbent article described in any one of <1> to <13> above,

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

<15>

In the absorbent article described in any one of <1> to <14> above,

The absorber has an antioxidant.

Embodiments and examples of the present invention have been described. Unless otherwise specified, the present invention is not limited to any details described, and the present invention should be interpreted more broadly without departing from the gist of the present invention shown in the scope of claims.

This application claims priority based on Japanese Patent Application No. 2019-122080 filed in Japan on June 28, 2019, the content of which is incorporated by reference as a part of the description of this specification.

Explanation of reference signs

1 Absorbent body

11 side seal

12 waist opening

13 leg opening

2 exterior body

21 Front exterior body

22 Rear exterior body

3 front panels

35 intermediate parts

4 back sheet

5 absorber

55 joint

56 compartments

56R space

6 absorbent core

61 front

62 rear part

67 superabsorbent polymer

68 pulp fibers

69 Outer edge of the skin side of the absorbent core

7 packs of chips

71 skin side bag chip

72 non-skin side package chip

75-pack chip stack

8 gap

9 side panels

91 Elastic parts

92 Three-dimensional folds

93 Elastic parts

94 Leg creases

10 diapers

10F Front side of diaper

10C Middle part of diaper

Back side of 10R diaper

10D diaper waist

F Front side of absorbent core

C The middle part of the absorbent core

R Rear side of absorbent core

Y The length direction of the absorbent core (or the length direction of the absorbent main body)

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

Claims (14)

1. An absorbent article, which has an absorbent body, the absorbent body has an absorbent core and a wrapping chip covering the skin surface side and the non-skin surface side of the absorbent core, and the absorbent article is characterized in that: At least one of the skin surface side and the non-skin surface side of the absorbent core is provided with an L ^* value of 40 to 100 and an a ^* value of -12 or more in the L ^* a ^* b ^* color system. and 3 or less, and the b ^* value is in the range of -24 or more and 3 or less color parts, The absorbent core is an aggregate of a superabsorbent polymer and pulp fibers, and the superabsorbent polymer is disposed on the skin side of the absorbent core, On the skin surface side of the absorptive core, a joint portion between the absorptive core and the wrapping chip is arranged, and on at least a part of the skin surface side of the absorptive core, a joint portion surrounded by the absorptive core is arranged. a compartment for the superabsorbent polymer, delimiting a region where the superabsorbent polymer is disposed, The color is a color within a range that is in a complementary color relationship with the color of the superabsorbent polymer after discoloration, The joining portion is arranged in a spiral shape, the compartments are arranged without gaps, The color is arranged on the whole of the part. 2. The absorbent article of claim 1, wherein: The basis weight of the junction part on the skin surface side of the absorptive core is 3 g/m ² or more and 10 g/m ² or less. 3. The absorbent article according to claim 1 or 2, characterized in that: The absorbent core has a length direction corresponding to a direction in which the wearer's front side, crotch portion, and back side are connected, and a width direction orthogonal to the length direction, The compartments surrounding the superabsorbent polymer form a row in the longitudinal direction, and three or more of the rows are arranged in the width direction. 4. The absorbent article according to claim 1 or 2, characterized in that: In the absorbent core, the basis weight of the superabsorbent polymer increases from the non-skin side to the skin side. 5. The absorbent article according to claim 1 or 2, characterized in that: When the absorbent core is divided in the thickness direction into a front part on the skin side and a back part on the non-skin side, the basis weight of the superabsorbent polymer in the front part is 40 g/m ² or more. 6. The absorbent article according to claim 1 or 2, characterized in that: A top sheet is disposed on the skin surface side of the absorber, and an intermediate member is disposed between the absorber and the top sheet. 7. The absorbent article of claim 6, wherein: The intermediate member is an achromatic color having an L ^* value of 50 or more and 80 or less shown in the L ^* a ^* b ^* color system. 8. The absorbent article according to claim 1 or 2, characterized in that: The L ^* value of the absorber viewed from the skin side of the absorbent article in the L ^* a ^* b ^* color system is 85 or less. 9. The absorbent article according to claim 1 or 2, characterized in that: The absorbent body has a compression portion. 10. The absorbent article according to claim 1 or 2, characterized in that: A slit is disposed in the absorbent core, and the wrapping cores disposed on the skin surface side and the non-skin surface side of the absorbent core are joined to each other in the slit. 11. The absorbent article according to claim 1 or 2, characterized in that: In the absorbent core, the surface area of the superabsorbent polymer increases toward the skin side. 12. The absorbent article according to claim 1 or 2, characterized in that: On the non-skin surface side of the absorber, a back sheet having the L ^* value of 40 to 100 and the a ^* value of -12 in the L ^* a ^* b ^* color system is disposed on the back sheet. A member having a color within a range of not less than 3 and not more than -24 and not more than 3 with a b ^* value. 13. The absorbent article according to claim 1 or 2, characterized in that: A surface sheet having a concavo-convex structure is disposed on the skin surface side of the absorber. 14. The absorbent article of claim 1 or 2, wherein: The absorber has an antioxidant.

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