Underpants-style absorbent article

Abstract

An underpants-style absorbent article comprising a pair of torso-surrounding sections and an absorbent body, and having a torso-surrounding opening and a pair of leg-surrounding openings, wherein the absorbent body has leg gather sections in both side sections in a left / right direction, at least one of a skin-facing-side sheet and a non-skin-facing-side sheet of one of the torso-surrounding sections is a colored sheet in which the entire area is a prescribed color, and on one side in the left / right direction as viewed from the skin-facing side during an opened condition and an expanded condition, when a region that is within a lower end section of said one torso-surrounding section, follows along the leg-surrounding opening, and has a prescribed width in a lengthwise direction is treated as a lower end section region, and a region that is within a side end section of the leg gather section, follows along the leg-surrounding opening, and has a prescribed width in the left / right direction is treated as a side end section region, as viewed from the skin-facing side, the color of the lower end section region is the same type of color as the prescribed color, the side end section region comprises a portion that is the same type of color as the prescribed color, and the color that is said same type of color in the lower end section region and the color that is said same type of color in the side end section region differ in darkness.

Description

Pants-type absorbent article

[0001] The present invention relates to a pants-type absorbent article.

[0002] Pant-type absorbent articles, such as disposable diapers, have been known as absorbent articles for absorbing excrement such as urine and feces. Generally, a pant-type absorbent article is worn by passing a wearer's legs through a pair of leg openings and pulling the pant-type absorbent article up from the crotch side toward the head. Regarding wearing a pant-type absorbent article, for example, Patent Document 1 discloses a disposable diaper in which the diaper is colored blue almost entirely when viewed from the outside, including the ventral and dorsal regions, and the edge of the dorsal region on the waist opening side is colored white, thereby making it easy to distinguish between the front and back of the diaper.

[0003] Japanese Patent Application Laid-Open No. 2020-103696

[0004] As in the diaper of Patent Document 1, it is preferable to color the substantially entire diaper blue to create a unified appearance of the diaper and also to make it easier for the wearer to put on the pants-type absorbent article, but when the parts forming the leg openings are formed in the same color overall, as in the diaper of Patent Document 1, there is a problem that when the wearer looks at the leg openings through the waist opening, it is difficult for the wearer to recognize the position of the leg openings through which the wearer should put their legs if the parts forming the leg openings are a uniform color overall. In particular, there is a problem that it is difficult for infants to recognize not only the position of the leg openings but also the existence of the leg openings when the parts forming the leg openings are a uniform color.

[0005] Therefore, the present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a pants-type absorbent article that makes it easy for the wearer to recognize the position of the leg openings while easily creating a sense of uniformity in appearance.

[0006] The main invention for achieving the above object is a pants-type absorbent article comprising a pair of waist-line sections and an absorbent main body having a liquid-absorbent absorbent core, the pair of waist-line sections comprising one side waist-line section and another side waist-line section made of a member separate from the one side waist-line section, a waist-line opening formed by joining both side end sections of the pair of waist-line sections at a joining section, and a pair of leg-line openings, the article having a longitudinal direction, a left-right direction and a thickness direction which intersect with one another in an unfolded and stretched state, the one side waist-line section being located at one end side in the longitudinal direction and the other side waist-line section being located at the other end side in the longitudinal direction, the absorbent main body having one end side in the longitudinal direction joined to the one side waist-line section and the other end side in the longitudinal direction joined to the other side waist-line section, the absorbent main body having leg gather sections on both left and right sides, the leg gather sections being located between a pair of gathered sheet sections and a pair of gathered sheet sections and leg-opening elastic members provided on the waistband portion, the one side of the waistband having a skin-side sheet adjacent to the skin-side elastic member stretchable in the left-right direction and a non-skin-side sheet adjacent to the skin-side elastic member, at least one of the skin-side sheet and the non-skin-side sheet being a sheet having a predetermined color throughout, wherein, when viewed from the skin side, a region of the lower end of the one side of the waistband portion that is aligned with the leg-openings and has a predetermined width in the longitudinal direction is defined as a bottom end region, and a region of the side end of the leg gathers that is aligned with the leg-openings and has the predetermined width in the left-right direction is defined as a side end region, the color of the bottom end region is similar to the predetermined color, the side end regions have portions that are similar in color to the predetermined color, and the similar color of the bottom end region and the similar color of the side end regions are different in intensity. Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0007] According to the present invention, it is possible to provide a pants-type absorbent article that allows the wearer to easily recognize the positions of the leg openings.

[0008] 5 is a perspective view of a pants-type disposable diaper 1. FIG. 6 is a plan view of the diaper 1 in an unfolded and stretched state as viewed from the skin side. FIG. 7 is a plan view of the diaper 1 in an unfolded and stretched state as viewed from the non-skin side. FIG. 8 is a cross-sectional view taken along the arrows A-A in FIG. 2. FIG. 9 is an explanatory diagram of the absorbent main body 10. FIG. 10 is a cross-sectional view taken along the arrows B-B in FIG. 5. FIG. 11 is a diagram illustrating the visibility of the diaper 1 as viewed from the skin side. FIG. 12 is a diagram illustrating the visibility of the diaper 1 as viewed from the non-skin side. FIG. 13 is a schematic diagram showing the state when looking from the waist opening BH to the leg openings LH. FIG. 14 shows the measurement results of the diaper 1 and the diaper 100.

[0009] At least the following matters will become clear from the description of this specification and the accompanying drawings. (Aspect 1) a pair of waist-line sections and an absorbent main body having a liquid-absorbent absorbent core, the pair of waist-line sections comprising one side waist-line section and another side waist-line section made of a member separate from the one side waist-line section; a waist-line opening formed by joining both side ends of the pair of waist-line sections at a joining section; and a pair of leg-line openings; the article has a longitudinal direction, a left-right direction, and a thickness direction which intersect with one another in an unfolded and extended state; the one side waist-line section is located at one end side of the longitudinal direction, and the other side waist-line section is located at the other end side of the longitudinal direction; the absorbent main body has one end side joined to the one side waist-line section and the other end side joined to the other side waist-line section; the absorbent main body has leg gather sections on both left-right sides, the leg gather sections being formed by joining a pair of gathered sheet sections and leg-line openings formed between the pair of gathered sheet sections; and an elastic member, wherein the one side waistline portion has a skin-side sheet adjacent to the waistline elastic member that is stretchable in the left-right direction from the skin side, and a non-skin-side sheet adjacent to the waistline elastic member from the non-skin side, at least one of the skin-side sheet or the non-skin-side sheet is a sheet with a predetermined color over its entire area, and when viewed from the skin side, on one side in the left-right direction, a region of the lower end of the one side waistline portion that is aligned with the leg openings and has a predetermined width in the longitudinal direction is defined as a bottom end region, and a region of the side end of the leg gather portion that is aligned with the leg openings and has the predetermined width in the left-right direction is defined as a side end region, the color of the bottom end region is similar to the predetermined color when viewed from the skin side, and the side end region has a portion that is similar in color to the predetermined color, and the similar color of the bottom end region and the similar color of the side end region are different in intensity.

[0010] According to the pants-type absorbent article of aspect 1, at least a portion of one side waist portion and leg gathered portion have portions of similar color, which makes it easier to create a unified appearance for the entire pants-type absorbent article, while the lower end region and the side end region that form the leg openings have different color intensities when viewed from the skin side, making it easier for the wearer to recognize the position of the leg openings and making it easier to put on the pants-type absorbent article.

[0011] (Aspect 2) A pants-type absorbent article comprising a pair of waist-line sections and an absorbent main body having a liquid-absorbent absorbent core, the pair of waist-line sections comprising one-side waist-line section and the other-side waist-line section made of a separate member from the one-side waist-line section, a waist-line opening formed by joining both side ends of the pair of waist-line sections at a joining section, and a pair of leg-line openings, the article having a longitudinal direction, a left-right direction, and a thickness direction that intersect with one another in an unfolded and stretched state, the one-side waist-line section being located at one end in the longitudinal direction, and the other-side waist-line section being located at the other end in the longitudinal direction, the absorbent main body having one end in the longitudinal direction joined to the one-side waist-line section and the other end in the longitudinal direction joined to the other-side waist-line section, the absorbent main body having leg gather sections on both left and right sides, respectively, the leg gather sections comprising a pair of gathered sheet sections and a pair of gathered sheet sections. and leg-opening elastic members provided between the waistband members, wherein the one-side waistband portion has a skin-side sheet adjacent to the skin-side elastic members stretchable in the left-right direction, and a non-skin-side sheet adjacent to the waistband elastic members from the non-skin-side, and at least one of the skin-side sheet and the non-skin-side sheet is a sheet having a predetermined color over its entire area, and when viewed from the skin side, a region of the lower end of the one-side waistband portion along the leg-openings on one side in the left-right direction is defined as a bottom end region, and a region of the side end regions of the leg gathers along the leg-openings and having the predetermined width in the left-right direction is defined as a side end region, the color of the bottom end region is similar to the predetermined color, and the side end regions have parts in a similar color to the predetermined color, and a linear relationship between the similar color of the bottom end region and the similar color of the side end region is defined as ＊ a ＊ b＊ The pants-type absorbent article is characterized by a color difference of more than 6.0 in a color system.

[0012] According to the pants-type absorbent article of aspect 2, at least a portion of one side waist portion and leg gathered portion have portions of similar color, which makes it easier to create a unified appearance for the entire pants-type absorbent article, while the colors of the lower end region and the side end region that form the leg openings are different when viewed from the skin side, making it easier for the wearer to recognize the position of the leg openings and making it easier to put on the pants-type absorbent article.

[0013] (Aspect 3) A pants-type absorbent article according to Aspect 1 or 2, characterized in that it has a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member stretching in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand on the skin side and a fixed portion that cannot stand, and when an area of ​​the leakage prevention wall portions that overlaps with the side end region in the longitudinal direction and an area along the longitudinal direction having the predetermined width in the left-right direction from the tip of the upstanding portion is defined as an upstanding portion tip region, the similar color of the side end region and the color of the upstanding portion tip region have different darknesses when viewed from the skin side.

[0014] According to the pants-type absorbent article of aspect 3, it is easier for the wearer to recognize the difference between the leg gather portion and the leakage barrier portion, making it easier for the wearer to recognize the position of the leg openings and making it easier to put on the pants-type absorbent article.

[0015] (Aspect 4) A pants-type absorbent article according to any one of Aspects 1 to 3, characterized in that it has a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member stretching in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up against the skin and a fixed portion that cannot stand up, and when a region of the leakage prevention wall portions that overlaps with the side end region in the longitudinal direction and a region along the longitudinal direction having the predetermined width in the left-right direction from the tip of the upstanding portion is defined as an upstanding portion tip region, the similar color of the side end region is a different color from the color of the upstanding portion tip region.

[0016] According to the pants-type absorbent article of aspect 4, it is easier for the wearer to recognize the difference between the leg gather portion and the leakage barrier portion, making it easier for the wearer to recognize the position of the leg openings and making it easier to put on the pants-type absorbent article.

[0017] (Aspect 5) A pants-type absorbent article according to any one of Aspects 1 to 4, characterized in that it has a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member that stretches in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up against the skin and a fixed portion that cannot stand up, and on one side in the left-right direction, at the center of the longitudinal direction of the pants-type absorbent article, the length in the left-right direction of the upstanding portion is shorter than the length from the base end of the upstanding portion to the side end of the leg gathered portion.

[0018] According to the pants-type absorbent article of aspect 5, even if the upright portions of the leakage-proof wall portions collapse outward in the left-right direction when the wearer tries to put on the pants-type absorbent article, at least a portion of the side end regions of the leg gathered portions can be easily seen, and the color of the side end regions makes it easier for the wearer to recognize the position of the leg openings, making it easier to put on the pants-type absorbent article.

[0019] (Aspect 6) The pants-type absorbent article according to any one of Aspects 1 to 5, wherein the pair of gathered sheet portions are each a colored nonwoven fabric sheet, a film sheet is provided between the pair of gathered sheet portions, and on one side in the left-right direction, a side edge of the film sheet is provided inside in the left-right direction from a side edge of the pair of gathered sheet portions.

[0020] According to the pants-type absorbent article of aspect 6, the pair of gathered sheet portions made of colored nonwoven fabric sheets and the film sheet placed between the pair of gathered sheet portions make it easier to keep the leg gathered portions flat in the left-right direction, making it easier for the wearer to recognize the color of the side edge regions that form the leg openings. At the same time, by placing the side edges of the film sheet laterally inward from the side edges of the pair of gathered sheet portions, at least the areas near the side edges of the side edge regions do not overlap with the film sheet, thereby reducing the risk of discomfort to the wearer's legs due to the rigidity of the film sheet. At the same time, the color near the side edges of the side edge regions can be the color of the pair of gathered sheet portions made of colored nonwoven fabric sheets, making it easier for the wearer to recognize the position of the leg openings.

[0021] (Aspect 7) The pants-type absorbent article of Aspect 6, wherein, when viewed from the skin side, the color of the area where the pair of gathered sheet portions and the film sheet do not overlap is darker than the color of the area where the pair of gathered sheet portions and the film sheet overlap.

[0022] According to the pants-type absorbent article of aspect 7, the color near the side edges of the side end region, which is the area where the pair of gathered sheet portions and the film sheet do not overlap, is darker than the color of the area where the pair of gathered sheet portions and the film sheet overlap, making it easier for the wearer to recognize the outline of the leg openings and making it easier for the wearer to put on the pants-type absorbent article.

[0023] (Aspect 8) A pants-type absorbent article according to any one of Aspects 1 to 7, characterized in that in the one-side waistline portion, the color of the skin-side sheet and the color of the non-skin-side sheet are different, one end of the skin-side sheet in the longitudinal direction and one end of the non-skin-side sheet in the longitudinal direction are located at different positions, the other-side waistline portion has a other-side skin-side sheet adjacent to the other-side waistline stretch member that is stretchable in the left-right direction from the skin side, and a other-side non-skin-side sheet adjacent to the other-side waistline stretch member from the non-skin side, at least one of the other-side skin-side sheet and the other-side non-skin-side sheet is a sheet of a similar color to the specified color throughout, and the other end of the other side skin-side sheet in the longitudinal direction and the other end of the other side non-skin-side sheet are located at the same position.

[0024] According to the pants-type absorbent article of aspect 8, when the article is in pants form, the color of the upper end of one side waist portion is different from the color of the upper end of the other side waist portion, so that the one side waist portion and the other side waist portion can be distinguished, making it easier for the wearer to recognize the front-to-back direction of the pants-type absorbent article.

[0025] (Aspect 9) A pants-type absorbent article according to any one of aspects 1 to 8, characterized in that in the one-side waistband portion, the color of the skin-side sheet and the color of the non-skin-side sheet are different, one end of the skin-side sheet in the longitudinal direction and one end of the non-skin-side sheet in the longitudinal direction are located at different positions, and when viewed from the skin side, the similar color of the side end region is darker than the similar color of the lower end region, and the similar color of the lower end region is darker than the similar color of the region of the one-side waistband where the skin-side sheet and the non-skin-side sheet do not overlap.

[0026] According to the pants-type absorbent article of aspect 9, the color of the same color becomes darker from the waist opening toward the leg openings of the pants-type absorbent article when it is in the pants-like state, making it easier for the wearer to intuitively recognize the area where they will put their legs through, making it easier for the wearer to put on the pants-type absorbent article.

[0027] (Aspect 10) The pants-type absorbent article according to any one of Aspects 1 to 9, wherein the one-side waistband portion is such that either the skin-side sheet or the non-skin-side sheet is entirely made of a sheet of the predetermined color, and the other is entirely uncolored.

[0028] According to the pants-type absorbent article of aspect 10, by making one side waist region, lower end region and side end region a predetermined color or a similar color, the pants-type absorbent article has an overall sense of unity, while by making one side waist region by layering a sheet of a predetermined color and a white sheet, the similar color of the one side waist region is softened, softening the impression of the pants-type absorbent article while making the similar color of the side end region appear darker, thereby improving the impression of the pants-type absorbent article to the wearer and making it easier for the wearer to recognize the position of the leg openings, making the pants-type absorbent article easier to wear.

[0029] (Aspect 11) A pants-type absorbent article according to any one of Aspects 1 to 10, characterized in that it has a pair of leak-proof wall portions on both sides in the left-right direction, the leak-proof wall portions comprising a leak-proof wall sheet along the longitudinal direction and a leak-proof wall stretch member that stretches in the longitudinal direction, the leak-proof wall portions having an upstanding portion that can stand up on the skin side and a fixed portion that cannot stand up, and the area between the base ends of the upstanding portions on both sides in the left-right direction is white when viewed from the skin side.

[0030] According to the pants-type absorbent article of aspect 11, the area between the base ends of the standing portions is white, making it easy to check the state of the absorbed excrement when wearing the article, and the wearer can easily recognize the position of the leg openings by visually checking the similar color of the side end areas against the white color of the central part in the left-right direction of the pants-type absorbent article, making it easier to wear the pants-type absorbent article.

[0031] (Aspect 12) A leak-preventing device having a pair of leak-preventing wall portions on both sides in the left-right direction, the leak-preventing wall portions including a leak-preventing wall sheet along the longitudinal direction and a leak-preventing wall stretchable member stretching in the longitudinal direction, the leak-preventing wall portions having an upstanding portion that can stand up on the skin side and a fixed portion that cannot stand up, a region of the pair of waistband portions that is outside the leg gathered portion in the longitudinal direction is defined as a first region, and a region that is inside a lower end of the one waistband portion and inside a lower end of the other waistband portion in the longitudinal direction and that is also inside a base end of the upstanding portion on both sides in the left-right direction is defined as a second region. 12. A pants-type absorbent article according to any one of aspects 1 to 11, characterized in that, when the region between the first region and the second region is defined as a second region, when viewed from the non-skin side, 50% or more of the area of ​​each of the first region, the second region, and the side edge region is the similar color portion, the similar color of the side edge region is darker than the similar color of the first region, the similar color of the side edge region is darker than the similar color of the second region, and the similar color of the first region and the similar color of the second region have different intensities.

[0032] According to the pants-type absorbent article of aspect 12, the sense of unity when viewed from the non-skin side of the pants-type absorbent article is improved, while the wearer can more easily recognize the position of the leg openings, making it easier to put on the pants-type absorbent article.

[0033] Embodiments Hereinafter, an embodiment of the pants-type absorbent article according to the present invention will be described using a pants-type disposable diaper for infants as an example. However, the pants-type absorbent article according to the present invention is not limited to pants-type disposable diapers for infants, but can also be applied to pants-type disposable diapers for adults, sanitary shorts, etc.

[0034] ===Configuration of pants-type disposable diaper 1=== Figure 1 is a perspective view of pants-type disposable diaper 1 (hereinafter referred to as "diaper 1"). Figure 2 is a plan view of the diaper 1 in an unfolded and stretched state, viewed from the skin side. Figure 3 is a plan view of the diaper 1 in an unfolded and stretched state, viewed from the non-skin side. Figure 4 is a cross-sectional view taken along the arrows A-A in Figure 2. Figure 5 is an explanatory diagram of the absorbent main body 10. Figure 6 is a cross-sectional view taken along the arrows B-B in Figure 2. Note that Figure 6 is a cross-sectional view taken along the arrows B-B in Figure 2 and also a cross-sectional view taken along the arrows B-B in Figure 5. The center line C-C shown in Figure 2 etc. indicates the center of the diaper 1 in the left-right direction, and the center line CL indicates the center of the diaper 1 in the longitudinal direction in the unfolded state.

[0035] In the pants-type state shown in Fig. 1, the diaper 1 has a vertical direction, a horizontal direction, and a front-to-back direction, and is formed with a waist opening BH and a pair of leg openings LH. In the vertical direction, the waist side is the upper side, and the crotch side is the lower side. In the front-to-back direction, the wearer's abdominal side is the front side, and the wearer's back side is the rear side. As shown in Figs. 4 and 6, the direction in which the materials constituting the diaper 1 are layered is referred to as the thickness direction, and the side that comes into contact with the wearer in the thickness direction is referred to as the skin side, and the side that does not come into contact with the wearer is referred to as the non-skin side.

[0036] The diaper 1 is formed of three components: an absorbent main body 10 having a rectangular shape in a plan view, and a pair of waist-circulating sections 20, 30. Of the pair of waist-circulating sections 20, 30, the one that is placed against the wearer's abdominal side is referred to as a abdominal waist-circulating section (other-side waist-circulating section) 20, and the other that is placed against the wearer's dorsal side is referred to as a dorsal waist-circulating section (one-side waist-circulating section) 30. The abdominal waist-circulating section 20 and the dorsal waist-circulating section 30 are separate components. Hereinafter, "one end side" and "one side" in the longitudinal direction will be referred to as the dorsal side, and "the other end side" and "other side" will be referred to as the abdominal side. In the following description, the dorsal waist-circulating section 30 will be referred to as the one-side waist-circulating section, and the abdominal waist-circulating section 20 will be referred to as the other-side waist-circulating section. However, the abdominal waist-circulating section 20 may also be referred to as the one-side waist-circulating section, and the dorsal waist-circulating section 30 as the other-side waist-circulating section.

[0037] In the unfolded diaper 1 shown in Fig. 2 and other figures, the ventral waist portion 20 and the back waist portion 30 are arranged so that their longitudinal directions are aligned with the left-right direction of the diaper 1. Hereinafter, in the unfolded diaper 1, one longitudinal side is also referred to as the back side, and the other longitudinal side is also referred to as the ventral side. The front end (the other longitudinal end) of the absorbent main body 10 is joined to the center of the ventral waist portion 20 in the left-right direction with an adhesive such as a hot melt adhesive, and the rear end (one longitudinal end) of the absorbent main body 10 is joined to the center of the back waist portion 30 in the left-right direction with an adhesive. In other words, the ventral waist portion 20 is located on the front side of the absorbent main body 10, and the back waist portion 30 is located on the back side of the absorbent main body 10.

[0038] In the diaper 1 in the unfolded state shown in Figure 2, the longitudinal direction of the absorbent body 10 is arranged along the vertical direction of the diaper 1, the absorbent body 10 is folded in half approximately at the center in the longitudinal direction, and both side ends of the ventral waist portion 20 and both side ends of the dorsal waist portion 30 in the left-right direction of the diaper 1 are joined by welding, adhesive, etc. to form joints 40, thereby resulting in the diaper 1 in the pants-type state shown in Figure 1.

[0039] The ventral waistline portion 20 and the back waistline portion 30 each have waistline elastic members 23, 33 (e.g., rubber thread) that are stretchable in the left-right direction. The ventral waistline portion 20 has a skin-side sheet 21 adjacent to the waistline elastic member 23 from the skin side, and a non-skin-side sheet 22 adjacent to the waistline elastic member 23 from the non-skin side. The back waistline portion 30 has a skin-side sheet 31 adjacent to the waistline elastic member 33 from the skin side, and a non-skin-side sheet 32 ​​adjacent to the waistline elastic member 33 from the non-skin side. Examples of skin-side sheets 21, 31 and non-skin-side sheets 22, 32 include flexible sheets such as air-through nonwoven fabric, spunbond nonwoven fabric, and SMS nonwoven fabric (spunbond-meltblown-spunbond nonwoven fabric). The waistline elastic members 23, 33 are each elastic members such as rubber thread. The plurality of waistline elastic members 23 are fixed between the skin side sheet 21 and the non-skin side sheet 22 with an adhesive such as a hot melt adhesive, with gaps between them in the vertical direction and stretched in the horizontal direction. The plurality of waistline elastic members 33 are fixed between the skin side sheet 31 and the non-skin side sheet 32 ​​with an adhesive such as a hot melt adhesive, with gaps between them in the vertical direction and stretched in the horizontal direction. The elastic threads or elastic sheets of the waistline elastic members 23, 33 stretch and contract, allowing the ventral waistline portion 20 and the dorsal waistline portion 30 to fit the waist of the wearer.

[0040] The ventral waistline portion 20 and the back waistline portion 30 each have folded-back portions 24, 34 formed by folding back the upper ends of the non-skin-side sheets 22, 32 from the non-skin-side toward the skin-side. These folded-back portions 24, 34 cover the upper ends of the skin-side sheets 21, 31, thereby preventing the upper edges of the skin-side sheets 21, 31 from digging into the wearer's skin. However, the folded-back portions 24, 34 are not necessarily provided.

[0041] The waistband portions 20, 30 may each include not only skin-side sheets 21, 31 and non-skin-side sheets 22, 32, but also layers of different materials in the thickness direction between the skin-side sheets 21, 31 and the non-skin-side sheets 22, 32. For example, as in the diaper 1 of this embodiment, the ventral waistband portion 20 and the dorsal waistband portion 30 preferably include a skin-contact sheet 26 and a skin-contact sheet 36, respectively. Examples of the skin-contact sheets 26, 36 include flexible sheets such as air-through nonwoven fabric, spunbond nonwoven fabric, and SMS nonwoven fabric (spunbond-meltblown-spunbond nonwoven fabric). The skin-contact sheets 26 and 36 are each a substantially rectangular sheet extending in the left-right direction, and are arranged to cover one end and the other end of the absorbent main body 10 in the longitudinal direction from the skin side, respectively. This prevents the upper edges (the ends on one side and the other side in the longitudinal direction) of the absorbent body 10 from digging into the wearer's skin when the diaper 1 is worn. Note that the skin-contact sheets 26, 36 do not necessarily have to be provided.

[0042] As shown in Figure 4, etc., the absorbent body 10 has an absorbent body 11, a liquid-permeable top sheet 12 arranged on the skin side of the absorbent body 11, a liquid-impermeable back sheet 13 arranged on the non-skin side of the absorbent body 11, and an outer sheet 14 arranged on the non-skin side of the back sheet 13.

[0043] As shown in Fig. 2 and other figures, the absorbent body 11 has a liquid-absorbent core 11A that absorbs and retains excreted liquids such as urine, and a liquid-permeable core wrap sheet 11B that covers the absorbent core 11A. An example of the absorbent core 11A is one in which liquid-absorbent fibers such as pulp containing superabsorbent polymer (SAP) are molded into a predetermined shape. Note that the absorbent core 11A does not have to be covered with the core wrap sheet 11B.

[0044] The top sheet 12 is a liquid-permeable sheet, and may be, for example, a hydrophilic air-through nonwoven fabric or spunbond nonwoven fabric. In this embodiment, both left and right sides are folded back to the non-skin side so as to encase the absorbent body 11, as shown in Figure 6. The back sheet 13 is a liquid-impermeable sheet, and may be, for example, a film sheet such as a resin film. The exterior sheet 14 is a flexible sheet, and may be, for example, an air-through nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric (spunbond-meltblown-spunbond nonwoven fabric), or the like.

[0045] As shown in Figure 5 and other figures, the absorbent main body 10 has a pair of leakage preventing wall portions 15 on both left and right sides. The pair of leakage preventing wall portions 15 are so-called three-dimensional gather portions. Each of the pair of leakage preventing wall portions 15 has a standing portion 15b that can stand up toward the skin side and a fixed portion 15a that cannot stand up. The leakage preventing wall portions 15 include a leakage preventing wall sheet 151 and a leakage preventing wall stretchable member 152 such as rubber thread. In the diaper 1, the leakage preventing wall stretchable member 152 made of a plurality of rubber threads is fixed in a stretched state between the folded leakage preventing wall sheets 151 using an adhesive such as a hot melt adhesive. When the leakage preventing wall stretchable member 152 contracts, the standing portion 15b of the leakage preventing wall portion 15 stands up toward the skin side. The leak barrier sheets 151 are fixed to each other and to the top sheet 12 in adhesive regions A1 along the longitudinal direction of the leak barrier sheets 151 from the front end to the rear end, and both longitudinal end portions of the leak barrier sheets 151 are fixed to the top sheet 12 in adhesive regions A2 on the left-right inward side of the adhesive region A1. The standing portions 15b of the diaper 1 are on the left-right inward side of the adhesive region A1 and on the longitudinal inward side of the adhesive region A2.

[0046] 2 and other figures, leg gathers 16 are provided on both sides of the absorbent main body 10 in the left-right direction, outside the leakage preventing walls 15 in the left-right direction. The pair of leg gathers 16 provided on the absorbent main body 10 are each provided along the leg openings LH. The leg gathers 16 have a pair of gathered sheet portions 161, leg elastic members 162, and a film sheet 163. The leg elastic members 162 stretch to allow the leg gathers 16 to fit around the legs of the wearer.

[0047] The pair of gathered sheet portions 161 are formed by folding back a single nonwoven fabric sheet to form a skin-side gathered sheet portion 161a located on the skin side and a non-skin-side gathered sheet portion 161b located on the non-skin side of the skin-side gathered sheet portion 161a. Note that the pair of gathered sheet portions 161 may be formed such that the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b are separate sheets.

[0048] The leg elastic members 162 are elastic members that are stretchable in the longitudinal direction, and examples thereof include rubber threads and elastic nonwoven fabrics. The leg elastic members 162 are fixed in a state in which they are stretched in the longitudinal direction between the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b. When rubber threads are used as the leg elastic members 162, it is preferable to arrange multiple rubber threads, and more preferably five or more. The leg elastic members 162 of this embodiment are provided with five to six rubber threads that are stretchable in the longitudinal direction and spaced apart in the left-right direction.

[0049] The film sheet 163 is a liquid-impermeable sheet member, and examples of the material for the film sheet 163 include liquid-impermeable films mainly made of polyethylene (PE), polypropylene (PP), etc., breathable films, and composite sheets in which a liquid-impermeable film is laminated on one side of a nonwoven fabric such as spunbond. Also, hydrophobic nonwoven fabric, impermeable plastic film, and laminate sheets of nonwoven fabric and impermeable plastic film may be used.

[0050] By arranging a plurality of rubber threads at intervals in the left-right direction as the leg elastic members 162, the leg gathered portions 16 can be more easily brought into surface contact with the wearer's legs, making it easier to fit the leg gathered portions 16 to the wearer's legs. Also, by providing the leg gathered portions 16 with the film sheets 163, it becomes easier to increase the rigidity of the leg gathered portions 16, making it easier to bring the leg gathered portions 16 into surface contact with the wearer's legs, making it easier to fit the leg gathered portions 16 to the wearer's legs.

[0051] Regarding the Visibility of the Diaper 1: For pants-type absorbent articles such as disposable diapers, it is preferable that the appearance of the pants-type absorbent article be uniform in order to improve aesthetic appeal. The uniform appearance of pants-type absorbent articles is easily achieved by color. However, if the overall color of the pants-type absorbent article is uniform, there is a problem in that when putting on the pants-type absorbent article, the wearer has difficulty recognizing the position of the leg openings when passing their legs from the waist opening to the leg openings. In particular, as infants grow, they may try to insert their legs into the leg openings of the pants-type absorbent article, but they may not be able to accurately recognize the existence of the leg openings or the position where they should insert their legs, which can cause them to have difficulty putting on the article or to lose their balance and fall.

[0052] In contrast, the diaper 1 has the following features, which facilitate a unified appearance of the entire diaper 1 while also allowing the wearer to easily recognize the positions of the leg openings LH of the diaper 1, making it easier to put on the diaper 1. Note that, while the following mainly describes the features of the diaper 1 on one side in the left-right direction of the diaper 1, the diaper 1 may have a shape symmetrical with respect to the center C-C in the left-right direction, and the other side in the left-right direction may also have the same configuration as the one side in the left-right direction, as in the diaper 1 of this embodiment. It is also possible for the features of the diaper 1 to be provided only on one side in the left-right direction and not on the other side in the left-right direction.

[0053] Fig. 7 is a diagram illustrating the visibility of the diaper 1 as viewed from the skin side. Fig. 8 is a diagram illustrating the visibility of the diaper 1 as viewed from the non-skin side. Fig. 9 is a schematic diagram illustrating the state when viewed from the waist opening BH to the leg openings LH. For convenience, Figs. 7 and 8 omit components such as the elastic members 23, 33 of the diaper 1 shown in Figs. 2 and 3, respectively.

[0054] As described above, the diaper 1 is a so-called three-piece pants-type disposable diaper having an absorbent main body 10 with a liquid-absorbent absorbent core 11A, a back waist section 30, and a ventral waist section 20 that is a separate member from the back waist section 30, and has a waist opening BH and a pair of leg openings LH that are provided by joining both side ends of the pair of waist sections 20, 30 at a joining section 40. In the unfolded and stretched state, the ventral waist section 20 is located at the front end and the back waist section 30 is located at the rear end, and the front end of the absorbent main body 10 is joined to the ventral waist section 20 and the rear end is joined to the back waist section 30. The absorbent main body 10 has leg gathers 16 on both left and right side portions. The leg gather portion 16 includes a pair of gather sheet portions 161 (skin side gather sheet portion 161a, non-skin side gather sheet portion 161b) and a leg elastic member 162 provided between the skin side gather sheet portion 161a and the non-skin side gather sheet portion 161b.

[0055] The back waist portion 30 includes a skin-side sheet 31 adjacent to the skin-side waist elastic members 33, which are stretchable in the left-right direction, and a non-skin-side sheet 32 ​​adjacent to the non-skin-side waist elastic members 33, and at least one of the skin-side sheet 31 and the non-skin-side sheet 32 ​​is a colored sheet having a "predetermined color" throughout. In the diaper 1 of this embodiment, the skin-side sheet 31 is blue (colored), and the non-skin-side sheet 32 ​​is white. As shown in Figures 7 and 8, when the diaper 1 is viewed from the skin-side in the unfolded and stretched state, a region of the lower end of the back waist portion 30 along the leg openings LH on one side in the left-right direction and having a predetermined width X1 in the longitudinal direction is referred to as a back-side lower end region KRb, and a region of the side end of the leg gathers 16 along the leg openings LH and having a predetermined width X1 in the left-right direction is referred to as a side end region TR. In this case, when the diaper 1 is viewed from the skin side, the color of the back-side lower end region KRb is a similar color (blue-based) to the predetermined blue color of the skin-side sheet 31. Also, the side end region TR has a portion that is a similar color to the predetermined blue color of the skin-side sheet 31. Furthermore, the similar color (blue) of the back-side lower end region KRb and the similar color (blue-based) of the side end region TR have different shades.

[0056] In the diaper 1 of this embodiment, the nonwoven fabric fibers forming the skin-side sheet 31 are themselves colored blue, so that the entire skin-side sheet 31 is blue (colored). The nonwoven fabric fibers forming the non-skin-side sheet 32 ​​are themselves colored white, so that the entire non-skin-side sheet 32 ​​is white. As a result, when the diaper 1 is viewed from the skin side, the blue color of the skin-side sheet 31 in the back-side waistband portion 30 can be seen, and when the diaper 1 is viewed from the non-skin side, the blue color of the skin-side sheet 31 can be seen through the white color of the non-skin-side sheet 32. Therefore, the blue color of the back-side waistband portion 30 can be recognized as part of the appearance of the diaper 1.

[0057] In the diaper 1 of this embodiment, the skin-facing sheet 36 and the folded-over portion 34 are located closer to the skin than the skin-facing sheet 31, so that the blue color of the skin-facing sheet 31 of the back-side waistline portion 30 appears lighter when the diaper 1 is viewed from the skin side. Specifically, because the non-skin-facing sheet 32 ​​and the skin-facing sheet 36 are white, when the diaper 1 is viewed from the skin side, the color of the portion of the back-side waistline portion 30 where the folded-over portion 34 and the skin-facing sheet 36 overlap is lighter than the color of the back-side lower end region KRb. When viewed from the skin side, the color of the portion that overlaps the skin-facing sheet 36 but does not overlap the folded-over portion 34 is darker than the color of the portion where the folded-over portion 34 and the skin-facing sheet 36 overlap, and lighter than the color of the back-side lower end region KRb.

[0058] In the diaper 1 of this embodiment, the entire skin-side sheet 31 is a sheet of a predetermined color, but this is not limited to this. The entire non-skin-side sheet 32 ​​may be a sheet of a predetermined color, or both the skin-side sheet 31 and the non-skin-side sheet 32 ​​may be sheets of a predetermined color.

[0059] The leg gather portion 16 of the diaper 1 of this embodiment is formed by folding a single blue sheet to form the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b. The sheets forming the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b are made of nonwoven fabric fibers colored blue. Therefore, the entire skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b are each blue, and the entire gathered sheet portion 161 is blue. However, the entire skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b do not necessarily have to be blue (the same color as the skin-side sheet 31). It is sufficient that at least a portion of the side edge region TR is blue (the same color) visible from both the skin side and the non-skin side. Preferably, in the side edge regions TR, the blue parts of the leg gathers 16 are continuous in the longitudinal direction along the leg openings LH, so that the wearer can easily recognize the position of the leg openings LH by the blue parts of the side edge regions TR when wearing the garment.

[0060] Among the regions along the leg openings LH, the lower back region KRb has a predetermined longitudinal width X1, and the side edge regions TR have a predetermined lateral width X1. The predetermined width X1 can be set to any length. The predetermined width X1 of the diaper 1 of this embodiment is the lateral length X1 of the region along the leg openings LH, when viewed through the thickness of the diaper 1, of the leg gathered portion 16 where the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b overlap, and where no sheet member other than the gathered sheet portion 161, such as the film sheet 163, overlaps. However, if rubber thread is used as the leg elastic member 162, the region where the rubber thread is provided between the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b may be defined as the side edge region TR, since the thickness of the rubber thread is thin and has little effect on visibility.

[0061] "Colored" refers to colors other than colorless, transparent, and white. White includes, for example, the color expressed as "N9.5" in the Munsell color system, and the color expressed as "255, 255, 255" in the RGB color space (so-called pure white), as well as colors whose color difference from pure white is less than 12. To measure the color difference of white, for example, a color difference meter such as the CR-400 manufactured by Konica Minolta can be used, and the light source of the measuring device can be Illuminant C (standard of the International Commission on Illumination (CIE)). In this case, the diameter of the measuring window of the measuring device is 40 mm. The color difference is measured by measuring the color difference (L ＊ a ＊ b ＊ ) are ΔL, Δa, and Δb in the color space. The color difference relative to a white reference plate can be calculated by measuring the lab values ​​of the white reference plate and the target sample. The white reference plate is set to lab0 with (X93.19, Y95.20, Z112.28). Here, L is a value that indexes brightness, and a and b are plane coordinates of chromaticity. If the Lab values ​​of the white reference plate are L0, a0, and b0, and those of the target sample are L1, a1, and b1, then ΔL can be calculated as ΔL = L0 - L1, Δa = a0 - a1, and Δb = b0 - b1.

[0062] "Similar colors" refers to colors that are different in hue less than 5, value less than 1, or saturation less than 1 in the Munsell color system (100 hues), and includes cases where the colors are identical. Preferably, the color difference ΔE is less than 12.0. The color difference can be measured by well-known methods, for example, by the following method. (1) Using a general-purpose color difference meter (for example, CR-400 manufactured by Konica Minolta, Inc., or an equivalent) (measuring diameter: Φ8 mm), measurement is performed in a thermostatic chamber at 20°C. (2) With respect to the diaper 1 in an unfolded and stretched state placed on a horizontal table, the CIE L * a * b * The coordinates are measured at three or more points by changing the position, and the average value (L1 * , a1 * , b1 * (3) Calculate the CIE L of the part of the sample to be compared. * a * b* The coordinates are measured at three or more points by changing the position, and the average value (L2 * , a2 * , b2 * (4) Calculate the color difference ΔE from the above results. ΔE=[(L1 * -L2 * ) ２ + (a1 * -a2 * ) ２ + (b1 * -b2 * ) ２ 〕 １／２

[0063] In this embodiment, the leg gathers 16 have blue-based portions of a similar color, and the side edge regions TR of the leg gathers 16 have blue portions of a similar color to the skin side sheet 31, but the colors of the skin side sheet 31, the back side lower edge region KRb, and the side edge regions TR are not limited to blue. The skin side sheet 31 (or the non-skin side sheet 32) may be any color such as red, pink, purple, green, etc., and the back side lower edge region KRb and the side edge regions TR may be a similar color to the color of the skin side sheet 31.

[0064] The comparison of the color intensity of each region can be performed by a known method. For example, if the difference in color intensity is noticeable with the naked eye, a method of comparing the color intensity with the naked eye may be adopted. ＊ a ＊ b ＊ Color system L ＊ Value and a ＊ value and b ＊ A method of comparing the color depth of the sample (each region) based on the three elements of the value may also be used. In addition, the color depth of the other regions can be measured in a similar manner, not limited to the side edge region TR and the lower back edge region KRb.

[0065] Color intensity L ＊ a ＊ b ＊When comparing using the three elements of the color system, evaluation can be performed based on the results of measurements made using the following method. Since color evaluation is prone to variations and errors in measurement values ​​due to color unevenness, etc., multiple measurements should be made for each target area, and the average of the multiple measurements should be used for color evaluation. When the impact of color unevenness in the target area is judged to be small when viewed with the naked eye, approximately three measurements should be made for the target area. When the impact of color unevenness in the target area is judged to be large when viewed with the naked eye, more than three measurements should be made for the target area, and the average of the measurement results should be used for evaluation. (1) Measurements are performed using a general-purpose color difference meter (e.g., a CR-400 manufactured by Konica Minolta, Inc., or equivalent) (measuring diameter: Φ8 mm) in a constant temperature room at 20°C. (2) With the diaper 1 placed in an unfolded and stretched state on a horizontal table, the L of the skin side of the sample's measurement area (each area KRb, TR) is measured. ＊ a ＊ b ＊ Color system L * a * b * (3) From the results of each measurement, the color depth of each area can be evaluated using the following formula: Formula 1 = (L ２ +a ２ +b ２ ) １／２ The smaller the calculated value of Formula 1, the darker the color. Note that "different color intensities" means that the absolute value of the difference between the calculated values ​​of Formula 1 for multiple regions is 1.0 or more.

[0066] 10A shows the measurement results of the diaper 1, and FIG. 10B shows the measurement results of the diaper 100. Since the color of the target areas of the diaper 1 and the diaper 100 of this embodiment can be judged to be roughly uniform to the naked eye, three measurements (n1 to n3) were taken for each area. FIG. 10A shows the L values ​​of three points (n1 to n3) on the skin side of the lower back end area KRb, the side end area TR, and the inner area UR of the diaper 1 of the present invention. ＊ Value and a ＊ value and b ＊10B shows the results of measuring the L value, the value calculated from the measurement results using the above-mentioned formula 1, and the color difference obtained from the calculated value. The inner region UR is a region of the leg gathered portion 16 that is laterally inward of the side edge region TR and outward of one of the left and right side edges of the absorbent body 11, and is a region where the skin-side gathered sheet portion 161a, the film sheet 163, and the non-skin-side gathered sheet portion 161b overlap. Fig. 10B shows the L values ​​of the back-side lower edge region KRb, the side edge region TR, and three points (n1 to n3) on the skin-side surface of the inner region UR of a diaper 100 that is a modified example of the diaper 1 of the present invention. ＊ Value and a ＊ value and b ＊ The table shows the measurement results of the color difference, the value calculated from the measurement results using the above-mentioned formula 1, and the color difference obtained from the calculated value. Diaper 100 has the same overall configuration as diaper 1, and the "predetermined color" of diaper 100 is pink. In other words, diaper 1 and diaper 100 have the same configuration except for the difference in the "predetermined color." Therefore, parts that are the same as those in diaper 1 are given the same reference numerals, etc.

[0067] As shown in Figure 10A, the value of Equation 1 calculated from the measurements of the skin-side surface of the side edge region TR of the diaper 1 and its average value (78.8) are smaller than the value of Equation 1 calculated from the measurements of the skin-side surface of the back-side lower edge region KRb and its average value (83.2). The absolute value of the difference between the calculated values ​​of Equation 1 (the absolute value of the difference between the average values ​​is 4.4) is clearly greater than 1.0. Therefore, the color intensity of the side edge region TR and the color intensity of the back-side lower edge region KRb are different. Furthermore, since the value of Equation 1 calculated from the measurements of the back-side lower edge region KRb is smaller than the value of Equation 1 calculated from the measurements of the side edge region TR, the side edge regions TR of the diaper 1 are darker in color than the back-side lower edge region KRb.

[0068] As shown in Figure 10B, the value of Equation 1 calculated from the measurements of the skin-side surface of the side edge region TR of the diaper 100 and its average value (84.5) are smaller than the value of Equation 1 calculated from the measurements of the skin-side surface of the back-side lower edge region KRb and its average value (87.2). The absolute value of the difference between the calculated values ​​of Equation 1 (the absolute value of the difference between the average values ​​is 2.7) is clearly greater than 1.0. Therefore, the color intensity of the side edge region TR and the color intensity of the back-side lower edge region KRb are different. Furthermore, since the value of Equation 1 calculated from the measurements of the back-side lower edge region KRb is smaller than the value of Equation 1 calculated from the measurements of the side edge region TR, the side edge regions TR of the diaper 1 are darker in color than the back-side lower edge region KRb.

[0069] In the diaper 1, the entire skin-side sheet 31 is blue (predetermined color), which allows the back waist portion 30 to be visually recognized as blue. Also, as shown in Fig. 9, at least a portion of the leg gathers 16 has a blue portion that is similar in color to the skin-side sheet 31, which allows the blue color of the back waist portion 30 and the leg gathers 16 of the diaper 1 to be visually recognized, thereby making it easier to create a unified appearance of the diaper 1, as shown in Fig. 1, etc. 8, when the diaper 1 is viewed from the skin side, the color density of the side edge regions TR, which are similar in color to the skin-side sheet 31, is different from the color density of the back-side lower edge region KRb, which is similar in color to the skin-side sheet 31. This makes the boundaries between the side edge regions TR and the back-side lower edge region KRb more noticeable when the leg openings LH are viewed through the waist opening BH during putting on the diaper 1, making it easier for the wearer to recognize the position of the leg openings LH of the diaper 1. This gives the wearer a sense of uniformity in the appearance of the diaper 1 and makes it easier to put on the diaper 1. In particular, in the diaper 1, the color density of the side edge regions TR is different from the color density of the back-side lower edge region KRb, and the side edge regions TR are darker than the back-side lower edge region KRb, making it easier to recognize the leg gathers 16 and the position of the leg openings LH.

[0070] Similarly, in the diaper 100, the entire skin-side sheet 31 is pink (predetermined color), so that the pink color of the back waist portion 30 can be visually recognized. Furthermore, by providing at least a portion of the leg gathers 16 with a pink-colored portion that is similar in color to the skin-side sheet 31, the similar pink color of the back waist portion 30 and the leg gathers 16 of the diaper 100 can be visually recognized, which facilitates the creation of a unified appearance of the diaper 1. Furthermore, when the diaper 100 is viewed from the skin side, the color density of the side edge regions TR, which are similar in color to the skin-side sheet 31, is different from the color density of the back-side lower edge region KRb, which is similar in color to the skin-side sheet 31. This makes it easier for the wearer to see the boundaries between the side edge regions TR and the back-side lower edge region KRb when looking at the leg openings LH through the waist opening BH while wearing the diaper 100, and makes it easier for the wearer to recognize the positions of the leg openings LH of the diaper 100. This gives the wearer a sense of uniformity in the appearance of the diaper 100, and makes it easier to put on the diaper 100. In particular, in the diaper 100, the color density of the side edge regions TR is different from the color density of the back-side lower edge region KRb, and the side edge regions TR are darker than the back-side lower edge region KRb, making it easier to recognize the leg gathers 16, and making it easier for the wearer to recognize the positions of the leg openings LH.

[0071] By providing at least portions of the back waist portion 30 and the leg gathers 16 with similar colors, the overall appearance of the diaper 1 is more likely to be unified, as shown in Fig. 8. When the diaper 1 is viewed from the skin side, the back lower end region KRb and the side end region TR constituting the leg openings LH have different color intensities, as shown in Fig. 7. Therefore, when the wearer looks into the leg openings LH through the waist opening BH, as shown in Fig. 9, the back lower end region KRb and the side end region TR along the leg openings LH can be more easily visually identified. This makes it easier for the wearer to recognize the position of the leg openings LH and put on the diaper 1.

[0072] Furthermore, the back-side lower end region KRb, which is a region of the back-side waistline portion 30 that lies along the leg-openings LH, is typically not provided with waistline elastic members 33 that stretch in the left-right direction, or even if waistline elastic members 33 are provided, the elasticity of the waistline elastic members 33 is relatively small. In other words, the back-side lower end region KRb is a region that is less likely to shrink in the left-right direction. On the other hand, the side end regions TR, which are regions of the leg gathers 16 that lies along the leg-openings LH, are more likely to shrink in the longitudinal direction due to the leg-opening elastic members 162 that stretch in the longitudinal direction. Therefore, when the diaper 1 is viewed from the skin side in the unfolded and stretched state (see FIG. 7 ), if the shades of the similar color (blue) of the back-side lower end region KRb and the similar color (blue-based) of the side end regions TR are different, the shades of the similar color (blue-based) of the back-side lower end region KRb and the similar color (blue-based) of the side end regions TR will be even more different in the natural state of the diaper 1 (see FIG. 1 ). In particular, when the diaper 1 in an unfolded and stretched state is viewed from the skin side, if the similar color (blue) of the side end region TR is darker than the similar color (blue) of the back lower end region KRb, then when the diaper 1 in its natural state is viewed from the skin side, the similar color (blue) of the side end region TR will appear even darker than the similar color (blue) of the back lower end region KRb. Therefore, when the wearer looks at the leg openings LH through the waist opening BH, it will be easier for the wearer to visually recognize the back lower end region KRb and the side end region TR among the areas along the leg openings LH, making it easier for the wearer to recognize the position of the leg openings LH and making it easier to put on the diaper 1.

[0073] The diaper 1 may include a skin-side sheet 21 adjacent to the skin-side elastic waistband member 23, which is stretchable in the left-right direction, in both the back waistband portion 30 and the ventral waistband portion 20, and a non-skin-side sheet 22 adjacent to the non-skin-side elastic waistband member 23, and the entire area of ​​at least one of the skin-side sheet 21 or the non-skin-side sheet 22 may be a colored sheet of a predetermined color. In the diaper 1 of this embodiment, the skin-side sheet 21 of the back waistband portion 30 and the ventral waistband portion 20 is a blue (colored) sheet, and the non-skin-side sheet 22 is a white sheet.

[0074] 7 and 8 , when the diaper 1 is in an unfolded and stretched state, viewed from the skin side, a region of the lower end of the ventral waistband portion 20 that is aligned with the leg openings LH and has a predetermined longitudinal width X1 is referred to as the ventral lower end region KRf, and a region of the side end of the leg gathers 16 that is aligned with the leg openings LH and has a predetermined transverse width X1 is referred to as the side end region TR. In this case, when the diaper 1 is viewed from the skin side, the color of the ventral lower end region KRf is a color similar to the predetermined blue color of the skin-side sheet 21. The side end region TR also includes a portion that is a color similar to the predetermined blue color of the skin-side sheet 21. Furthermore, the color intensity of the similar color (blue) of the ventral lower end region KRf is different from the color intensity of the similar color (blue-based) of the side end region TR.

[0075] In the diaper 1, the skin-side sheet 21 is entirely blue (colored) because the nonwoven fabric fibers forming the skin-side sheet 21 are themselves colored blue. The nonwoven fabric fibers forming the non-skin-side sheet 22 are entirely white because the non-skin-side sheet 22 is entirely white. As a result, the blue color of the skin-side sheet 21 in the ventral waistline portion 20 is visible when the diaper 1 is viewed from the skin side, and the blue color of the skin-side sheet 21 is visible through the white color of the non-skin-side sheet 22 when the diaper 1 is viewed from the non-skin side. Therefore, the blue color of the ventral waistline portion 20 can be recognized as an external appearance of the diaper 1. Note that in the diaper 1 of this embodiment, the skin-facing sheet 26 and the folded-over portion 24 are provided closer to the skin side than the skin-side sheet 21, so that the blue color of the skin-side sheet 21 in the ventral waistline portion 20 appears lighter when the diaper 1 is viewed from the skin side. Specifically, when the diaper 1 is viewed from the skin side, the color of the portion of the ventral waistband 20 that overlaps the folded-back portion 24 and the skin-facing sheet 26 is lighter than the color of the ventral lower end region KRf. When viewed from the skin side, the color of the portion that overlaps the skin-facing sheet 26 but does not overlap the folded-back portion 24 is darker than the color of the portion that overlaps the folded-back portion 24 and the skin-facing sheet 26 and lighter than the color of the ventral lower end region KRf. The entire non-skin-side sheet 22 may be a sheet of a predetermined color, or the entire areas of both the skin-side sheet 21 and the non-skin-side sheet 22 may be a sheet of a predetermined color.

[0076] As described above, in the leg gathered portion 16 of the diaper 1 of this embodiment, the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b are each entirely blue, and the entire gathered sheet portion 161 is also blue. In the leg gathered portion 16, the region along the leg opening LH has a ventral lower end region KRf with a predetermined width X1 in the longitudinal direction, and the side end region TR with a predetermined width X1 in the lateral direction. The predetermined width X1 is a length that can be set arbitrarily.

[0077] In the diaper 1, the entire skin-side sheet 21 is blue (predetermined color), which allows the ventral waist portion 20 to be visually recognized as blue. Furthermore, as shown in Fig. 9, at least a portion of the leg gathers 16 has a blue portion that is similar in color to the skin-side sheet 21, which allows the ventral waist portion 20 and the leg gathers 16 of the diaper 1 to be visually recognized as similar in color, thereby making it easier to create a unified appearance of the diaper 1, as shown in Fig. 1, etc. 8, when the diaper 1 is viewed from the skin side, the color density of the side edge regions TR, which are similar in color to the skin-side sheet 21, is different from the color density of the ventral lower edge region KRf, which is similar in color to the skin-side sheet 21. This makes the boundaries between the side edge regions TR and the ventral lower edge region KRf more noticeable when the leg openings LH are viewed through the waist opening BH during putting on the diaper 1, making it easier for the wearer to recognize the positions of the leg openings LH of the diaper 1. This gives the wearer a sense of uniformity in the appearance of the diaper 1 and makes it easier to put on the diaper 1. In particular, in the diaper 1, the color density of the side edge regions TR is different from the color density of the ventral lower edge region KRf, and the side edge regions TR are darker than the ventral lower edge region KRf, making it easier to recognize the leg gathers 16 and the position of the leg openings LH.

[0078] As shown in Fig. 8, the ventral waistline portion 20 and at least a portion of the leg gathers 16 have similarly colored portions, which contributes to a uniform appearance of the entire diaper 1. When the diaper 1 is viewed from the skin side, the ventral lower end region KRf and the side end region TR constituting the leg openings LH have different color intensities as shown in Fig. 7. This makes it easier for the wearer to visually distinguish the ventral lower end region KRf and the side end region TR from the regions along the leg openings LH when looking at the leg openings LH through the waistline opening BH as shown in Fig. 9. This makes it easier for the wearer to recognize the position of the leg openings LH and makes it easier for the wearer to put on the diaper 1.

[0079] As described above, the diaper 1 is a so-called three-piece pants-type disposable diaper, which includes an absorbent main body 10 having a liquid-absorbent absorbent core 11A, a back waist section 30, and a ventral waist section 20 that is a separate member from the back waist section 30, and has a waist opening BH and a pair of leg openings LH formed by joining both side ends of the pair of waist sections 20, 30 at a joining section 40. In the unfolded and stretched state, the ventral waist section 20 is located at the front end and the back waist section 30 is located at the rear end, and the front end of the absorbent main body 10 is joined to the ventral waist section 20 and the rear end is joined to the back waist section 30. The absorbent main body 10 has leg gathers 16 on both left and right sides. The leg gather portion 16 includes a pair of gather sheet portions 161 (skin side gather sheet portion 161a, non-skin side gather sheet portion 161b) and a leg elastic member 162 provided between the skin side gather sheet portion 161a and the non-skin side gather sheet portion 161b.

[0080] The back waist portion 30 includes a skin-side sheet 31 adjacent to the skin-side waist elastic members 33, which are stretchable in the left-right direction, and a non-skin-side sheet 32 ​​adjacent to the non-skin-side waist elastic members 33, and at least one of the skin-side sheet 31 and the non-skin-side sheet 32 ​​is a colored sheet having a "predetermined color" throughout. In the diaper 1 of this embodiment, the skin-side sheet 31 is blue (colored), and the non-skin-side sheet 32 ​​is white. As shown in Figures 7 and 8, when the diaper 1 is viewed from the skin-side in the unfolded and stretched state, a region of the lower end of the back waist portion 30 along the leg openings LH on one side in the left-right direction and having a predetermined width X1 in the longitudinal direction is referred to as a back-side lower end region KRb, and a region of the side end of the leg gathers 16 along the leg openings LH and having a predetermined width X1 in the left-right direction is referred to as a side end region TR. In this case, when the diaper 1 is viewed from the skin side, the color of the back-side lower end region KRb is similar to the predetermined blue color of the skin-side sheet 31. Also, the side end regions TR have portions that are similar to the predetermined blue color of the skin-side sheet 31. Furthermore, the L of the similar color (blue) of the back-side lower end region KRb and the similar color (blue-based) of the side end regions TR is ＊ a ＊ b ＊ The color difference in the color system is greater than 6.0. ＊ a ＊ b ＊ The color difference in the color system is greater than 6.0, which means that the L ＊ a ＊ b ＊ The difference in color between the regions is easier to recognize than when the color difference in the color system is 6.0 or less. ＊ a ＊ b ＊ In the color system, the a-value and b-value of the side edge region TR are close to the a-value and b-value of the back-side lower edge region KRb. ＊ a ＊ b ＊ When the color difference in the color system is greater than 6.0, the side edge region TR and the lower back edge region KRb have different color difference values ​​due to the difference in the L value, which is essentially lightness.

[0081] As described above, the skin-side sheet 31 of the diaper 1 is entirely blue (colored) because the nonwoven fabric fibers forming the skin-side sheet 31 are themselves colored blue. The non-skin-side sheet 32 ​​is entirely white because the non-skin-side fabric fibers forming the non-skin-side sheet 32 ​​are themselves white. As a result, the blue color of the skin-side sheet 31 in the back-side waistband portion 30 is visible when the diaper 1 is viewed from the skin side, and the blue color of the skin-side sheet 31 is visible through the white color of the non-skin-side sheet 32 ​​when the diaper 1 is viewed from the non-skin side. Therefore, the blue color of the back-side waistband portion 30 can be recognized as part of the appearance of the diaper 1.

[0082] In the leg gathered portion 16 of the diaper 1 of this embodiment, the sheets constituting the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b are formed from nonwoven fabric fibers colored blue, so that the entire skin-side gathered sheet portion 161a and the entire non-skin-side gathered sheet portion 161b are each a blue-based color, and the entire gathered sheet portion 161 is a blue-based color.

[0083] Of the regions along the leg openings LH, the lower back region KRb has a predetermined width X1 in the longitudinal direction, and the side edge regions TR have a predetermined width X1 in the left-right direction. The predetermined width X1 is a length that can be set arbitrarily. The predetermined width X1 of the diaper 1 of this embodiment is the left-right length X1 of the region along the leg openings LH, when viewed in the thickness direction of the diaper 1, of the region where the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b of the leg gathered portion 16 overlap, and where sheet members other than the gathered sheet portion 161, such as the film sheet 163, do not overlap.

[0084] The color difference between the regions can be measured by a known method, for example, by a method similar to the above-described method for measuring the color difference.

[0085] As shown in Figure 10A, the L value (L1), a value (a1), and b value (b1) of the side edge region TR and the lower back edge region KRb of the diaper 1 were measured, and the color difference calculated from these measurements is shown. Note that the color difference n1 in Figure 10A represents the color difference between the n1 results of the L value (L1), a value (a1), and b value (b1) of the side edge region TR and the n2 results of the L value (L2), a value (a2), and b value (b2) of the side edge region TR. The same applies to n2 and n3. As shown in Figure 10A, the color differences of the side edge region TR and the lower back edge region KRb ranged from 11.0 to 13.7, with an average value of 13.2. Therefore, the color difference is clearly greater than 6.0. As a result, when the diaper 1 is viewed from the skin side, the difference in color between the side end region TR and the back lower end region KRb makes it easier to recognize the boundary between the side end region TR and the back lower end region KRb at the leg opening LH.

[0086] As shown in Figure 10B, the L value (L1), a value (a1), and b value (b1) of the side edge region TR and the lower back edge region KRb of diaper 100 (a modified example of diaper 1) were measured, and the color difference calculated from these measurements is shown. Note that the color difference n1 in Figure 10B represents the color difference between the n1 results for the L value (L1), a value (a1), and b value (b1) of the side edge region TR and the n2 results for the L value (L2), a value (a2), and b value (b2) of the side edge region TR. The same applies to n2 and n3. As shown in Figure 10B, the color differences of the side edge region TR and the lower back edge region KRb ranged from 10.6 to 11.4, with an average value of 10.9. Therefore, the color difference is clearly greater than 6.0. As a result, when the diaper 100 is viewed from the skin side, the difference in color between the side end region TR and the back lower end region KRb makes it easier to recognize the boundary between the side end region TR and the back lower end region KRb at the leg opening LH.

[0087] In the diaper 1, the entire skin-side sheet 31 is blue (a predetermined color), so that the blue color of the back waistband 30 can be visually recognized. As shown in Fig. 9, at least a portion of the leg gathers 16 has a blue portion that is similar in color to the skin-side sheet 31. This visual recognition of the blue color of the back waistband 30 and the leg gathers 16 of the diaper 1 facilitates the creation of a unified appearance of the diaper 1, as shown in Fig. 1, etc. Furthermore, as shown in Fig. 8, when the diaper 1 is viewed from the skin side, the color difference between the side edge region TR, which is similar in color to the skin-side sheet 31, and the back lower edge region KRb, which is similar in color to the skin-side sheet 31, is L. ＊ a ＊ b ＊ When the color difference of the color system is 6.0 or more, the boundary between the side edge region TR and the back lower edge region KRb is easily noticeable when the leg openings LH are viewed from the waist opening BH while the diaper 1 is being worn, making it easier for the wearer to recognize the position of the leg openings LH of the diaper 1, and making it easier for the wearer to put on the diaper 1 while giving the wearer a sense of uniformity in appearance of the diaper 1. In particular, in the diaper 1, the color of the side edge region TR is different from the color of the back lower edge region KRb, and the color of the side edge region TR is darker than the back lower edge region KRb, making it easier to recognize the leg gathers 16, and making it easier for the wearer to recognize the position of the leg openings LH.

[0088] 8, the rear waistband 30 and the leg gathers 16 are at least partially in the same color, which helps to create a uniform appearance for the entire diaper 1. When the diaper 1 is viewed from the skin side, the L between the rear lower end region KRb and the side end region TR that form the leg openings LH is as shown in FIG. ＊ a ＊ b ＊ When the color difference of the color system is 6.0 or more, as shown in Figure 9, when a wearer looks at the leg openings LH from the waist opening BH, it becomes easier for them to visually recognize the back lower end region KRb and the side end region TR among the regions along the leg openings LH, making it easier for the wearer to recognize the position of the leg openings LH and making it easier for them to put on the diaper 1.

[0089] The diaper 1 may include a skin-side sheet 21 adjacent to the skin-side elastic waistband member 23, which is stretchable in the left-right direction, in both the back waistband portion 30 and the ventral waistband portion 20, and a non-skin-side sheet 22 adjacent to the non-skin-side elastic waistband member 23, and the entire area of ​​at least one of the skin-side sheet 21 or the non-skin-side sheet 22 may be a colored sheet of a predetermined color. In the diaper 1 of this embodiment, the skin-side sheet 21 of the back waistband portion 30 and the ventral waistband portion 20 is a blue (colored) sheet, and the non-skin-side sheet 22 is a white sheet.

[0090] As described above, the diaper 1 has a leakage preventing wall 15, which includes a leakage preventing wall sheet 151 extending in the longitudinal direction and a leakage preventing wall stretchable member 152 that stretches in the longitudinal direction. The leakage preventing wall 15 has a standing portion 15b that can stand up on the skin side and a fixed portion 15a that cannot stand up. As shown in FIG. 7 , a standing portion tip region SR is defined as a region of the leakage preventing wall 15 that overlaps the side edge region TR in the longitudinal direction and extends longitudinally from the tip 15e of the standing portion 15b to a predetermined width X1 in the left-right direction. In this case, when the diaper 1 is viewed from the skin side, it is preferable that the color depth of the side edge region TR, which is similar to the color of the skin side sheet 31 (skin side sheet 21), is different from the color depth of the standing portion tip region SR.

[0091] As described above, in the diaper 1 of this embodiment, the side edge regions TR are a bluish color similar to the blue color of the skin-side sheet 31. Furthermore, because the leak-barrier sheet 151 is a white nonwoven fabric sheet, the upright portion tip regions SR are white. Therefore, the color density of the side edge regions TR differs from the color density of the upright portion tip regions SR. In this diaper 1, the different color density of the side edge regions TR from the upright portion tip regions SR makes it easier to identify the positions of the side edge regions TR and the upright portion tip regions SR when viewing the diaper 1 from the skin side. Therefore, when wearing the diaper 1, looking into the leg openings LH through the waist opening BH, it becomes easier to identify the difference between the side edge regions TR adjacent to the leg openings LH and the leakage barrier portions 15. This makes it easier for the wearer to identify the position of the leg openings LH, making it easier to put on the diaper 1.

[0092] Furthermore, when the leakage barrier wall 15 is provided as described above, it is preferable that the color of the side edge region TR, which is similar to the color of the skin-side sheet 31 (skin-side sheet 21), be different from the color of the upright tip region SR of the leakage barrier sheet 151. In the diaper 1 of this embodiment, the side edge region TR is a bluish color and the upright tip region SR is white, so it is clear that the colors of the side edge region TR and the upright tip region SR are different. This makes it easy to identify the positions of the side edge region TR and the upright tip region SR when viewing the diaper 1 from the skin side. Therefore, when wearing the diaper 1, when looking into the leg openings LH through the waist opening BH, it is easy to identify the difference between the side edge region TR adjacent to the leg openings LH and the leakage barrier wall 15. This makes it easier for the wearer to identify the position of the leg openings LH, making it easier to put on the diaper 1.

[0093] It should be noted that "different in color" can be determined when the difference in color can be recognized visually, or by using a color difference meter. The color difference is measured using a general-purpose color difference meter (for example, CR-400 manufactured by Konica Minolta, or an equivalent) in a thermostatic chamber at 20 degrees. Specifically, the color difference is measured based on the tolerance grades generally used in JIS standards or various industrial associations, for example, L according to CIE 1976. ＊ a ＊ b ＊ When the color difference (ΔE) calculated by the color difference formula in the color space is 12.0 or more, preferably 25.0 or more, it is determined that the colors are "different."

[0094] 7, at the longitudinal center CL of the diaper 1, the length X2 of the upstanding portion 15b in the transverse direction is preferably shorter than the length X3 from the base end be of the upstanding portion 15b to the side end 16e of the leg gather portion 16 (X2<X3). As described above, the upstanding portion 15b is located laterally inward of the longitudinal adhesive region A1 and longitudinally inward of the adhesive region A2 provided at the longitudinal end. Therefore, the base end be of the upstanding portion 15b is the inner end of the longitudinal adhesive region A1. As a result, even if the standing portions 15b of the leakage preventing walls 15 are laterally tilted outward when the wearer puts on the diaper 1, the length X3 from the base end be of the standing portions 15b to the side ends 16e of the leg gathers 16 is longer than the lateral length X2 of the tilted standing portions 15b, thereby reducing the risk that the entire leg gathers 16 will be covered by the leakage preventing walls 15 and making it easier to see at least a part of the side edge regions TR of the leg gathers 16. This reduces the risk that the side edge regions TR of the leg gathers 16 will be blocked by the leakage preventing walls 15, and the wearer can easily recognize the position of the leg openings LH from the color of the side edge regions TR, making it easier to put on the diaper 1.

[0095] Furthermore, when the leakage preventing wall 15 has the above-described structure, it is preferable that the region between the base ends be of the upright portions 15b on both the left and right sides of the leakage preventing wall 15 is white when viewed from the skin side, as shown in Fig. 7. In the diaper 1 of this embodiment, the top sheet 12 and the absorbent body 11 are white, so that the region between the base ends be appears white when viewed from the skin side. When viewed from the skin side, the region between the base ends be of the upright portions 15b of the leakage preventing wall 15 is a region that can come into contact with the wearer's skin and absorb excrement when the upright portions 15b of the leakage preventing wall 15 are upright when worn. Therefore, by coloring the region between the base ends be of the upright portions 15b in the left and right directions white, it becomes easier to check the state of excrement when worn. Furthermore, when putting on the diaper 1, the wearer can easily see the bluish (similar) color of the side edge regions TR against the white color of the lateral center portion of the diaper 1 (between the base ends be of the upright portions 15b in the lateral direction), making the color of the side edge regions TR more conspicuous. This makes it easier for the wearer to recognize the position of the leg openings LH, making it easier to put on the diaper 1.

[0096] 8, the region of the pair of waistbands that is outside the leg gathers 16 in the longitudinal direction is defined as a first region R1. That is, the first region R1 is the region above the ventral end of the leg gathers 16 and the region above the dorsal end of the leg gathers 16. The second region R2 is the region inside (on the crotch side) the lower end of the ventral waistband 20 and the region inside (on the crotch side) the lower end of the dorsal waistband 30 in the longitudinal direction, and between the base ends be of the upright portions 15b of the leakage preventing walls 15 on both the left and right sides. In such a case, when the diaper 1 is viewed from the non-skin side ( FIG. 8 ), it is preferable that 50% or more of the area of ​​each of the first region R1 and the second region R2 be similarly colored, and that the bluish color (similar color) of the side edge region TR is darker than the bluish color (similar color) of the first region R1, and that the bluish color of the side edge region TR is darker than the bluish color (similar color) of the second region R2. It is also preferable that the bluish color of the first region R1 and the bluish color of the second region R2 differ in color intensity. Examples of area comparison methods include visual inspection and a method of calculating and confirming the areas of similar colors in each region R1 and R2 using an area calculation program. Examples of methods for confirming the area ratio of the similarly colored areas in each region R1 and R2 include visual inspection and a method of calculating and confirming the areas of similar colors in each region R1 and R2 using an area calculation program.

[0097] In the diaper 1 of this embodiment, the entire skin-side sheets 21, 31 of the ventral waistband 20 and the dorsal waistband 30 are blue (blue-based), so that when the diaper 1 is viewed from the non-skin side, it is visually apparent that the majority (50% or more of the area) of the first region R1 is blue (blue-based). Furthermore, in this embodiment, substantially the entire backsheet 13 (50% of the area) is blue, and the outer covering sheet 14 is white, so that when the diaper 1 is viewed from the non-skin side, the blue (blue-based) color of the backsheet 13 is visible through the outer covering sheet 14. This facilitates a sense of unity throughout the diaper 1 when viewed from the non-skin side, while also drawing the wearer's attention to the side edge regions TR, which makes it easier to recognize the location of the leg openings LH and facilitates putting on the diaper 1. The first region R1 and the second region R2 do not necessarily have to be exclusively a predetermined color or a color similar to the predetermined color. The first region R1 and the second region R2 visible from the non-skin side of the diaper 1 may have a pattern, design, or lettering in a predetermined color or a color similar to the predetermined color but different from the predetermined color.

[0098] As described above, the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b of the pair of gathered sheet portions 161 are preferably bluish (colored) nonwoven fabric sheets, and a film sheet 163 is preferably provided between the blue skin-side gathered sheet portion 161a and the blue non-skin-side gathered sheet portion 161b. When this film sheet 163 is provided, it is preferable that the side edge 163e of the film sheet 163 is provided laterally inward from the side edge 16e of the leg gathered portion 16, which is the side edge of the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b, on one left-right side of the diaper 1. In other words, when viewed in the thickness direction of the diaper 1, the outer left-right edges (side edge regions TR) of the leg gathered portion 16 are regions where only the gathered sheet portions 161 are overlapped, and where the film sheet 163 is not provided. The pair of gathered sheet portions 161 of the diaper 1 of this embodiment are each a blue sheet, and the film sheet 163 is a white sheet.

[0099] Generally, the film sheet 163 is a sheet with higher rigidity than the gathered sheet portions 161a, 161b, which are nonwoven fabric sheets. Therefore, the film sheet 163 provided between the skin-side gathered sheet portion 161a and the non-skin-side gathered sheet portion 161b increases the rigidity of the leg gathered portion 16, making it easier to maintain the leg gathered portion 16 in a flat state. Maintaining the flatness of the leg gathered portion 16 makes it easier to distinguish the predetermined color (blue) of the skin-side sheet 31 of the back waistband 30 and the similar color (blueish) of the gathered sheet portion 161 when viewed from the non-skin side, thereby creating a unified appearance for the diaper 1. Furthermore, when viewed from the skin side, it makes it easier to distinguish the portions of the side edge region TR of the gathered sheet portion 161 that are similar in color to the predetermined color, making it easier for the wearer to identify the position of the leg openings LH.

[0100] By providing the side edges 163e of the film sheet 163 on the inner side in the left-right direction than the side edges of the pair of gathered sheet portions 161 (the side edges 16e of the leg gathered portions 16), at least the side edges (near the outer edges in the left-right direction) of the side edge regions TR of the leg gathered portions 16 become areas where the film sheet 163 does not overlap. This reduces the risk that the portions where the highly rigid film sheet 163 is provided will come into contact with the wearer's skin and cause discomfort to the wearer's skin. In other words, this improves the contact of the leg gathered portions 16 with the skin around the wearer's legs when worn, while also making it easier to recognize portions of the side edge regions TR of the gathered sheet portions 161 that are similar in color to the specified color, making it easier for the wearer to recognize the positions of the leg openings LH.

[0101] Furthermore, when viewed from the skin side, it is preferable that the color of the region where the pair of gathered sheet portions 161 and the film sheet 163 do not overlap (side edge regions TR) is darker than the color of the region where the pair of gathered sheet portions 161 (skin-side gathered sheet portion 161a and non-skin-side gathered sheet portion 161b) and the film sheet 163 overlap (inner region UR). In the diaper 1 of this embodiment, the film sheet 163 is white, so the color of the side edge regions TR is darker than the inner region UR. This makes it easier for the wearer to notice the outline of the leg openings LH when viewing the diaper 1 from the skin side.

[0102] As shown in Figure 10A, the value of Equation 1 calculated from the measurements of the skin-side surface of the side edge regions TR of the diaper 1 and its average value (78.8) are smaller than the value of Equation 1 calculated from the measurements of the skin-side surface of the inner region UR and its average value (82.2). The absolute value of the difference between the calculated values ​​of Equation 1 (the difference in the average values ​​is 3.4) is clearly greater than 2.0. Therefore, the color intensity of the side edge regions TR and the color intensity of the inner region UR are different. Furthermore, since the value of Equation 1 calculated from the measurements of the inner region UR is smaller than the value of Equation 1 calculated from the measurements of the side edge regions TR, the side edge regions TR of the diaper 1 are darker in color than the inner region UR.

[0103] As shown in Figure 10B, the value of Equation 1 calculated from the measurements of the skin-side surface of the side edge region TR of the diaper 100 and its average value (84.5) are smaller than the value of Equation 1 calculated from the measurements of the skin-side surface of the inner region UR and its average value (86.8). The absolute value of the difference between the calculated values ​​of Equation 1 (the difference in average values ​​is 2.3) is clearly greater than 2.0. Therefore, the color intensity of the side edge region TR and the color intensity of the inner region UR are different. Furthermore, since the value of Equation 1 calculated from the measurements of the inner region UR is smaller than the value of Equation 1 calculated from the measurements of the side edge region TR, the color of the diaper 100 is darker in the side edge region TR than in the inner region UR.

[0104] As described above, similar to the back-side waistline portion 30, the ventral-side waistline portion 20 includes waistline elastic members 23 that are stretchable in the left-right direction, a skin-side sheet 21 adjacent to the waistline elastic members 23 from the skin side, and a non-skin-side sheet 22 adjacent to the waistline elastic members 23 from the non-skin side, and the skin-side sheet 21 is a sheet of a predetermined color (blue) throughout. In the back-side waistline portion 30, the skin-side sheet 31 and the non-skin-side sheet 32 ​​are preferably different colors. In the back-side waistline portion 30, the back-side end of the skin-side sheet 31 and the back-side end of the non-skin-side sheet 32 ​​are located at different positions in the longitudinal direction. In the ventral-side waistline portion 20, the ventral end of the skin-side sheet 21 and the ventral end of the non-skin-side sheet 22 are located at the same position in the longitudinal direction.

[0105] 9, when the diaper 1 is viewed from the non-skin side, the color of the skin-side sheet 21 is visible at the upper end of the ventral waistline portion 20, while the skin-side sheet 21 is not provided at the upper end of the back waistline portion 30, and the color of the skin-side sheet 31 is not visible at the upper end of the back waistline portion 30. Therefore, in the pants-type state (FIG. 1), the colors of the upper ends of the ventral waistline portion 20 and the back waistline portion 30 can be made different, which makes it easier for the wearer to distinguish between the ventral waistline portion 20 and the back waistline portion 30 and to recognize the front-to-back direction of the diaper 1.

[0106] As in the back-side waistband portion 30 of the diaper 1 of this embodiment, it is preferable that the skin-side sheet 31 and the non-skin-side sheet 32 ​​are different colors, and that the back-side end of the skin-side sheet 31 and the back-side end of the non-skin-side sheet 32 ​​are located at different longitudinal positions. In this case, when the diaper 1 is viewed from the skin side, it is preferable that the similar color (blue) of the side edge region TR is darker than the color of the back-side lower edge region KRb. Furthermore, it is preferable that the blue of the back-side lower edge region KRb is darker than the blue of the region of the back-side waistband portion 30 where the skin-side sheet 31 and the non-skin-side sheet 32 ​​do not overlap. In other words, in the diaper 1, the blue-colored skin-side sheet 31 does not extend to the upper end (back end) of the back waistband portion 30, so that the upper end of the back waistband portion 30 is a region where the skin-side sheet 31 and the non-skin-side sheet 32 ​​do not overlap when viewed in the thickness direction. Therefore, in the diaper 1 of this embodiment, the upper end portion of the back waist portion 30 is white, which is the color of the non-skin side sheet 32. As a result, the color of the back lower end region KRb of the back waist portion 30 is darker than the color of the upper end portion, and the color of the side end region TR is darker than the color of the back lower end region KRb.

[0107] As a result, when the diaper 1 is viewed in the pants-type state (see FIG. 1 ), the diaper 1 appears to have a darker blue color from the waist opening BH toward the leg openings LH. Therefore, by recognizing that the area that appears darker from the front to the back is arranged when the diaper 1 is worn, the wearer can intuitively identify the area through which the legs are to be passed (the leg openings LH), making it easier for the wearer to put on the diaper 1.

[0108] Furthermore, in the back-side waistband portion 30, when one of the skin-side sheet 31 or the non-skin-side sheet 32 ​​is a sheet of a predetermined color throughout, it is preferable that the other sheet is a sheet that is not colored throughout. In the back-side waistband portion 30 of this embodiment, the skin-side sheet 31 is a sheet that is entirely blue (a predetermined color), and the non-skin-side sheet 32 ​​is a sheet that is entirely white. Note that "not colored" is synonymous with "not colored."

[0109] As described above, by coloring the back waist portion 30, the back lower end region KRb, and the side end regions TR in a predetermined color or a similar color to the predetermined color, the diaper 1 can be more easily unified overall. Furthermore, by overlapping the blue skin-side sheet 31 and the white non-skin-side sheet 32 ​​in the back waist portion 30, the blue (or blue-ish) color of the back waist portion 30 can be softened, thereby making the diaper 1 appear more soft to the wearer. Furthermore, by softening the color of the back lower end region KRb in the back waist portion 30 while making the color of the side end regions TR of the leg gathers 16 appear darker, the wearer's attention can be more easily drawn to the leg openings LH. This softens the impression of the diaper 1 (back waist portion 30) and makes it easier for the wearer to recognize the location of the leg openings LH, making the diaper 1 easier to put on.

[0110] Although the embodiments of the present invention have been described above, the above embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. Furthermore, the present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof.

[0111] In the diaper 1 of the above-described embodiment, the colored (blue) skin side sheet 31 (21) and the colored (blueish) gathered sheet portion 161 are formed by forming nonwoven fabric fibers of a predetermined color (blue, blueish), respectively, into sheets, but this is not limiting. For example, each of the sheets 31, 21, 161 may be a white sheet colored with ink using inkjet or other means.

[0112] In the diaper 1, each of the sheets 31, 21, 161 may be plain and have no pattern or design, or each of the sheets 31, 21, 161 may have any design, pattern, lettering, etc. In such a case, the sheets 31, 21, 161 may have a predetermined color or a color different from a similar color to the predetermined color.

[0113] LIST OF SYMBOLS 1 Diaper (pants-type disposable diaper, pants-type absorbent article), 10 Absorbent body, 11 Absorbent body, 11A Absorbent core, 11B Core wrap sheet, 12 Top sheet, 13 Back sheet, 14 Outer sheet, 15 Leakage preventing wall portion, 151 Leakage preventing wall sheet, 152 Leakage preventing wall stretchable member, 16 Leg gathered portion, 161 Gathered sheet portion, 161a Skin side gathered sheet portion, 161b Non-skin side gathered sheet portion, 162 Leg circumference stretchable member, 163 Film sheet, 20 Abdominal side waist portion (waist portion, other side waist portion), 21 Skin side sheet (other side skin side sheet), 22 Non-skin side sheet (other side non-skin side sheet), 23 Waist circumference stretchable member (other side waist circumference stretchable member), 24 Folded portion, 26 Skin-facing sheet, 30: back-side waist portion (waist portion, one-side waist portion), 31: skin-facing sheet, 32: non-skin-facing sheet, 33: waist stretch member, 34: folded-back portion, 36: skin-facing sheet, 40: joining portion, KRf: ventral-side lower end region (lower end region), KRb: back-side lower end region (lower end region), TR: side end region, SR: standing portion tip region, UR: inner region

Claims

1. A pants-type absorbent article comprising a pair of waistbands and an absorbent main body having a liquid-absorbent absorbent core, wherein the pair of waistbands comprises one side waistband and another side waistband made of a separate member from the one side waistband, a waistband opening formed by joining both side ends of the pair of waistbands at a joining section, and a pair of leg openings, wherein in an unfolded and stretched state, the article has a longitudinal direction, a left-right direction, and a thickness direction that intersect with one another, the one side waistband is located at one end in the longitudinal direction, and the other side waistband is located at the other end in the longitudinal direction, the absorbent main body has one end in the longitudinal direction joined to the one side waistband and the other end in the longitudinal direction joined to the other side waistband, the absorbent main body has leg gather sections on both left-right sides, and the leg gather sections comprise a pair of gathered sheet sections and a leg-opening elastic member provided between the pair of gathered sheet sections, the one side waistline portion has a skin-side sheet adjacent to the waistline elastic member stretchable in the left-right direction from the skin side, and a non-skin-side sheet adjacent to the waistline elastic member from the non-skin side, at least one of the skin-side sheet or the non-skin-side sheet is a sheet with a predetermined color over its entire area, and when viewed from the skin side, on one side in the left-right direction, a region of the lower end of the one side waistline portion that is aligned with the leg openings and has a predetermined width in the longitudinal direction is defined as a bottom end region, and a region of the side end of the leg gather portion that is aligned with the leg openings and has the predetermined width in the left-right direction is defined as a side end region, when viewed from the skin side, the color of the bottom end region is similar to the predetermined color, and the side end region has a portion that is similar to the predetermined color, and the similar color of the bottom end region and the similar color of the side end region are different in intensity.

2. A pants-type absorbent article comprising a pair of waistbands and an absorbent main body having a liquid-absorbent absorbent core, wherein the pair of waistbands comprises one side waistband and another side waistband made of a separate member from the one side waistband, a waistband opening formed by joining both side ends of the pair of waistbands at a joining section, and a pair of leg openings, wherein in an unfolded and stretched state, the article has a longitudinal direction, a left-right direction, and a thickness direction that intersect with one another, the one side waistband is located at one end in the longitudinal direction, and the other side waistband is located at the other end in the longitudinal direction, the absorbent main body has one end in the longitudinal direction joined to the one side waistband and the other end in the longitudinal direction joined to the other side waistband, the absorbent main body has leg gather sections on both left-right sides, and the leg gather sections comprise a pair of gathered sheet sections and a leg elastic member provided between the pair of gathered sheet sections, The one-side waistline portion has a skin-side sheet adjacent to the waistline elastic member stretchable in the left-right direction from the skin side, and a non-skin-side sheet adjacent to the waistline elastic member from the non-skin side, and at least one of the skin-side sheet or the non-skin-side sheet is a sheet having a predetermined color over its entire area, and when viewed from the skin side, on one side in the left-right direction, a region of the lower end of the one-side waistline portion that is along the leg openings and has a predetermined width in the longitudinal direction is defined as a bottom end region, and a region of the side end of the leg gather portion that is along the leg openings and has the predetermined width in the left-right direction is defined as a side end region, when viewed from the skin side, the color of the bottom end region is a color similar to the predetermined color, and the side end region has a portion that is a color similar to the predetermined color, and the L of the similar color of the bottom end region and the similar color of the side end region is a color similar to the predetermined color. ＊ a ＊ b ＊ A pants-type absorbent article having a color difference of more than 6.0 in a color system.

3. A pants-type absorbent article according to claim 1 or 2, comprising a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member stretching in the longitudinal direction, the leakage prevention wall portions having a standing portion that can stand on the skin side and a fixed portion that cannot stand, and when an area of ​​the leakage prevention wall portions that overlaps with the side end region in the longitudinal direction and an area along the longitudinal direction having the predetermined width in the left-right direction from the tip of the standing portion is defined as a standing portion tip region, the similar color of the side end region and the color of the standing portion tip region are different in intensity when viewed from the skin side.

4. A pants-type absorbent article according to claim 1 or 2, comprising a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member stretching in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up against the skin and a fixed portion that cannot stand up, and when an area of ​​the leakage prevention wall portions that overlaps with the side end region in the longitudinal direction and an area along the longitudinal direction having the predetermined width in the left-right direction from the tip of the upstanding portion is defined as an upstanding portion tip region, the similar color of the side end region is a different color from the color of the upstanding portion tip region.

5. A pants-type absorbent article as claimed in claim 1 or 2, comprising a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretchable member stretching in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up against the skin and a fixed portion that cannot stand up, and on one side in the left-right direction, at the centre of the longitudinal direction of the pants-type absorbent article, the length in the left-right direction of the upstanding portion is shorter than the length from the base end of the upstanding portion to the side end of the leg gather portion.

6. A pants-type absorbent article according to claim 1 or 2, characterized in that the pair of gathered sheet portions are each a colored nonwoven fabric sheet, a film sheet is provided between the pair of gathered sheet portions, and on one side in the left-right direction, the side edge of the film sheet is provided inside in the left-right direction from the side edge of the pair of gathered sheet portions.

7. A pants-type absorbent article according to claim 6, characterized in that, when viewed from the skin side, the color of the area where the pair of gathered sheet portions and the film sheet do not overlap is darker than the color of the area where the pair of gathered sheet portions and the film sheet overlap.

8. A pants-type absorbent article as set forth in claim 1 or 2, wherein in the one-side waistband portion, the skin-side sheet and the non-skin-side sheet are different in color, one end of the skin-side sheet in the longitudinal direction and one end of the non-skin-side sheet in the longitudinal direction are located at different positions, the other-side waistband portion has an other-side skin-side sheet adjacent from the skin side to the other-side waistband stretch member that is stretchable in the left-right direction, and an other-side non-skin-side sheet adjacent from the non-skin side to the other-side waistband stretch member, at least one of the other-side skin-side sheet and the other-side non-skin-side sheet is a sheet of a similar color to the specified color over its entire area, and the other end of the other-side skin-side sheet in the longitudinal direction and the other end of the other-side non-skin-side sheet are located at the same position.

9. A pants-type absorbent article as claimed in claim 1 or 2, characterized in that in the one side waistband portion, the color of the skin side sheet and the color of the non-skin side sheet are different, one end of the skin side sheet in the longitudinal direction and one end of the non-skin side sheet in the longitudinal direction are located at different positions, and when viewed from the skin side, the similar color of the side end region is darker than the similar color of the lower end region, and the similar color of the lower end region is darker than the similar color of the region of the one side waistband where the skin side sheet and the non-skin side sheet do not overlap.

10. A pants-type absorbent article as claimed in claim 1 or 2, characterized in that the one side waistband portion has one of the skin-side sheet and the non-skin-side sheet entirely made of a sheet of the specified color, and the other entirely made of an uncolored sheet.

11. A pants-type absorbent article as claimed in claim 1 or 2, comprising a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member that stretches in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up on the skin side and a fixed portion that cannot stand up, and the area between the base ends of the upstanding portions on both sides in the left-right direction is white when viewed from the skin side.

12. A pants-type absorbent article according to claim 1 or 2, comprising a pair of leakage prevention wall portions on both sides in the left-right direction, the leakage prevention wall portions comprising a leakage prevention wall sheet along the longitudinal direction and a leakage prevention wall stretch member stretching in the longitudinal direction, the leakage prevention wall portions having an upstanding portion that can stand up on the skin side and a fixed portion that cannot stand up, wherein when a region of the pair of waistband portions that is outward from the leg gathered portion in the longitudinal direction is defined as a first region, and a region inward from the lower end of one waistband portion and the lower end of the other waistband portion in the longitudinal direction and between the base ends of the upstanding portions on both sides in the left-right direction is defined as a second region, when viewed from the non-skin side, 50% or more of the area of ​​each of the first region, the second region and the side edge region is the similar color, the similar color of the side edge region is darker than the similar color of the first region, A pants-type absorbent article characterized in that the similar color of the side end region is darker than the similar color of the second region, and the similar color of the first region and the similar color of the second region have different intensities.

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