Disposable diaper

Abstract

To provide a disposable diaper that allows a user to fix first and second fixing parts in an appropriate state, and is excellent in fitness.SOLUTION: A disposable diaper 1 is provided with: fixing parts 71, 72 disposed in both side parts in one end region 1b in a longitudinal direction X of an absorbent body 2; and a region 8 to be fixed formed at a non-skin facing side in the other end region 1a in the longitudinal direction X of the absorbent body 2. The fixing parts 71, 72 include the first fixing part 71 and the second fixing part 72, the region 8 to be fixed has a first design element 81 and a second design element 82, and the region 8 to be fixed has an inner region 91, and an outer region 92 positioned further outward in a lateral direction Y than the inner region 91 at both sides sandwiching a center line CL. The outer region 92 has stronger contrast of the first design element 81 to a background color compared to the inner region 91, and the inner region 91 has stronger contrast of the second design element 82 to a background color compared to the outer region 92.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a disposable diaper. [Background technology]

[0002] Conventionally, disposable diapers are known in which a fastening portion is provided on each side portion of one of the longitudinal end regions of the absorbent body, extending laterally outward from the side portion, and a fastening region to which the fastening portion can be removably fastened is formed on the non-skin-facing side of the other longitudinal end region of the absorbent body (see Patent Documents 1 to 4). Patent Document 1 describes that the fastening part has a base end fixed to the absorbent main body and an extension part extending from the absorbent main body, and that a pattern part is arranged on the extension part. The disposable diaper in Patent Document 1 has a pair of fastening parts spaced apart in the vertical direction on each side of the absorbent main body, and Patent Document 1 describes that the pattern part may be a marking that causes the fastening part located on the inner side in the vertical direction to be attached diagonally toward the fastening part located on the outer side in the vertical direction.

[0003] Patent Document 2 also describes a disposable diaper having a pair of fastening parts spaced apart in the vertical direction on both sides of the absorbent main body. The disposable diaper of Patent Document 2 has a guide tape attached to the non-skin facing surface of each of the pair of fastening parts. Patent Document 2 describes that the guide tape attached to the non-skin facing surface of the fastening part located on the inner side in the vertical direction guides the fastening part so as to pull it toward the outer side in the vertical direction, and the fastening part is fastened to the fastening area in a state in which it is inclined from the inner side to the outer side in the vertical direction. Patent Document 2 also describes that the guide tape attached to the non-skin facing surface of the fastening part located on the outer side in the vertical direction guides the fastening part so as to pull it toward the inner side in the vertical direction, and the fastening part is fastened to the fastening area in a state in which it is inclined from the outer side to the inner side in the vertical direction.

[0004] Patent Document 3 also describes a disposable diaper having a pair of fastening parts spaced apart in the vertical direction on both sides of the absorbent body. In Patent Document 3, the frontal tape forming the fastening area has a pair of pattern areas having a wave pattern composed of a plurality of convex figures, and a central area disposed between the pair of pattern areas. Each of the plurality of figures includes a first guide line that extends obliquely so as to approach the inner side in the vertical direction as it approaches the center in the horizontal direction of the frontal tape, and a second guide line that extends obliquely so as to move away from the inner side in the vertical direction as it approaches the center in the horizontal direction, and the angle between the first guide line and the second guide line becomes smaller as the figure is closer to the center of the frontal tape. Patent Document 3 describes that the pair of fastening parts can be overlapped and fastened at an appropriate angle according to the fastening position by arranging the fastening part located on the outer side in the vertical direction along the first guide line and arranging the fastening part located on the inner side in the vertical direction along the second guide line.

[0005] Patent Document 4 describes a disposable diaper having one fastening part on each side of the absorbent body. In the disposable diaper of Patent Document 4, the fastening area is formed by a landing tape, and a design including a pattern is applied to each side of the landing tape divided by an imaginary center line that divides the diaper in half horizontally. The pattern that constitutes the design has an indicator that indicates the fastening position of the fastening part, and the indicator continues from the side edge side along the vertical direction of the diaper toward the imaginary center line side and has a convex arc shape toward the outer side in the vertical direction. Patent Document 4 describes that the fastening part is fastened according to the shape of the indicator that constitutes the design of the landing tape. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-124423 A [Patent Document 2] JP 2006-68281 A [Patent Document 3] JP 2012-100752 A [Patent Document 4] JP 2008-168115 A Summary of the Invention [Problem to be solved by the invention]

[0007] In general, in a disposable diaper having a pair of fastening parts spaced apart in the vertical direction on each side of the absorbent main body, it is preferable, from the viewpoint of improving the fit of the diaper, to fasten the fastening part located on the inner side in the vertical direction in a state inclined outward in the vertical direction, and fasten the fastening part located on the outer side in the vertical direction in a state inclined inward in the vertical direction. Also, from the viewpoint of further improving the fit of the diaper, it is preferable that the fastening part located on the outer side in the vertical direction is fastened at a position on the inner side in the horizontal direction than the fastening part located on the inner side in the vertical direction. Although Patent Documents 1 to 3 describe fastening a pair of fastening parts in an inclined state, they do not consider at all the lateral positional relationship when the pair of fastening parts are fastened to the fastening area, leaving room for improvement. The disposable diaper in Patent Document 4 has one fastening part on each side of the absorbent main body, and Patent Document 4 makes no mention of a case in which a pair of fastening parts are provided on each side. Therefore, an object of the present invention is to provide an absorbent article that can overcome the drawbacks of the prior art. [Means for solving the problem]

[0008] The present invention provides a disposable diaper which comprises an absorbent body having a vertical direction and a horizontal direction, and in which a fastening portion is provided on each of both side portions of one end region of the absorbent body in the vertical direction, extending outward in the horizontal direction from the side portion, and in which a fastening region is formed on the non-skin-facing side of the other end region of the absorbent body in the vertical direction, to which the fastening portion can be removably fastened. In one embodiment, the fastening part preferably includes a first fastening part and a second fastening part located outward in the vertical direction from the first fastening part. In one embodiment, it is preferable that the fastening area has a first design element extending from the outer side toward the inner side in the horizontal direction and from the inner side toward the outer side in the vertical direction, and a second design element extending from the outer side toward the inner side in the horizontal direction and from the outer side toward the inner side in the vertical direction. In one embodiment, it is preferable that the fastening region has, on each side of a center line that divides the fastening region in two in the horizontal direction, an inner region located on the center line side, and an outer region located laterally outward from the inner region. In one embodiment, the outer region preferably has a stronger contrast of the first design element against the background color than the inner region. In one embodiment, the inner region preferably has a stronger contrast of the second design element against the background color than the outer region. Effect of the Invention

[0009] The disposable diaper of the present invention has an excellent fit because the first and second fastening parts can be fastened in appropriate states. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a disposable diaper which is a preferred embodiment of the absorbent article of the present invention. [Diagram 2] FIG. 2 is a plan view showing the skin-facing side of the diaper shown in FIG. 1 in an unfolded state. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a plan view showing the non-skin-facing side of the diaper shown in FIG. 1 in an unfolded state. [Diagram 5] FIG. 5 is a plan view showing the fastening area of ​​the diaper shown in FIG. [Figure 6]FIG. 6 is a diagram illustrating a method of wearing the diaper shown in FIG. [Figure 7] FIG. 7 is a partially enlarged view of FIG. [Figure 8] FIG. 8 is a diagram showing the non-skin-facing side of the abdominal portion of the diaper shown in FIG. 1 in a natural state. [Figure 9] 9(a) and (b) are diagrams illustrating a method for determining whether or not the other edge of the diaper in the longitudinal direction X is substantially parallel to the second design element when the diaper is in its natural state. [Figure 10] FIG. 10 is a diagram illustrating how to wear the diaper shown in FIG. [Figure 11] FIG. 11 is a plan view showing a precursor sheet used for forming the adherend region-forming sheet for the diaper shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The absorbent article of the present invention will be described below based on its preferred embodiments. Figures 1 to 4 show an open-type disposable diaper (hereinafter, also simply referred to as a "diaper") 1, which is one embodiment of the absorbent article of the present invention. The diaper 1 shown in Fig. 1 has a ventral portion A arranged on the ventral side of a wearer when the diaper 1 is worn, a dorsal portion B arranged on the dorsal side, and a crotch portion C arranged in the crotch portion. The diaper 1 also has a longitudinal direction X extending from the ventral portion A through the crotch portion C to the dorsal portion B, and a lateral direction Y perpendicular to the longitudinal direction X. The ventral portion A, the crotch portion C, and the dorsal portion B are regions obtained by dividing the entire length of the diaper 1 in the longitudinal direction X into three equal parts, and extend continuously in the front-to-rear direction of the wearer. The crotch portion C has an excretory portion-facing portion (not shown) that is arranged to face the excretory portion of the wearer when the diaper 1 is worn.

[0012] 2 and 3, the diaper 1 includes an absorbent body 2 having a longitudinal direction X and a transverse direction Y. The absorbent body 2 includes an absorbent body 23, a top sheet 21 arranged on the skin-facing side of the absorbent body 23, and a back sheet 22 arranged on the non-skin-facing side of the absorbent body 23. The top sheet 21 and the back sheet 22 each have a size larger than the absorbent body 23 and extend outward from the outer peripheral edge of the absorbent body 23. In this embodiment, both longitudinal end edges of the back sheet 22 substantially coincide with both longitudinal end edges of the diaper 1.

[0013] As shown in Fig. 2, the absorbent body 23 is arranged so that its longitudinal direction coincides with the vertical direction X of the diaper, and extends from the abdominal side portion A through the crotch portion C to the back side portion B. Both side edges of the absorbent body 23 along the vertical direction X are located inward of both side edges of the diaper 1 along the vertical direction X. As shown in Fig. 3, the absorbent body 23 is formed by covering an absorbent core 24 having absorption performance with a liquid-permeable core wrap sheet 25. It is preferable that at least the skin-facing surface of the absorbent core 24 is covered with the core wrap sheet 25, and the entire surface including the skin-facing surface and non-skin-facing surface may be covered with the core wrap sheet 25.

[0014] In the diaper 1 of this embodiment, the absorber 23 has a length (width) in the lateral direction Y that is not constant over the entire length in the longitudinal direction X, and both end regions in the longitudinal direction X have a longer length in the lateral direction Y and are wider than the central region. More specifically, as shown in Fig. 1, the absorber 23 has a narrow portion 23n and a wide portion 23w that is longer in the lateral direction Y than the narrow portion 23n. The wide portion 23w extends from the narrow portion 23n to both sides in the longitudinal direction X. The narrow portion 23n is located in the crotch portion C. The wide portions 23w are located in each of the abdominal portion A and the dorsal portion B.

[0015] 2 and 3, a plurality of leg gather elastic members 51 are disposed on the sides of the diaper 1 in the longitudinal direction X. The leg gather elastic members 51 are disposed in a stretched state along the longitudinal direction X. The leg gather elastic members 51 extend over at least the entire length of the crotch portion C in the longitudinal direction X. Contraction of the elastic members 51 forms leg gathers in the left and right portions disposed around the legs of the wearer, i.e., on both sides of the diaper 1 in the longitudinal direction X.

[0016] The elastic members 51 for leg gathers are disposed between the back sheet 22 and a member facing the skin-facing surface of the back sheet 22. More specifically, the elastic members 51 for leg gathers are disposed between the leakage preventing cuffs 3 and the back sheet 22 at a position where they overlap with the narrow portion 23n of the absorbent body 23 in the longitudinal direction X (see FIG. 3), and are disposed between the core wrap sheet 25 of the absorbent body 23 and the back sheet 22 at a position where they overlap with the wide portion 23w on the back side portion B side of the absorbent body 23 in the longitudinal direction X.

[0017] As shown in Figs. 2 and 3, the diaper 1 has a pair of leak-proof cuffs 3, 3 on both sides of the absorbent body 2 in the longitudinal direction X. The leak-proof cuffs 3 are arranged along the longitudinal direction X. As shown in Fig. 2, the leak-proof cuffs 3 have fixed ends 3a at one end in the transverse direction Y, which are fixed to other members (the top sheet 21 and the back sheet 22 in the embodiment shown in Fig. 3). The leak-proof cuffs 3 have free ends 3b at the other end in the transverse direction Y, which are not fixed to other members. At the free ends 3b of the leak-proof cuffs 3, one or more thread- or band-like elastic members (hereinafter, referred to as "leak-proof cuff-forming elastic members") 31 are arranged in a stretched state along the longitudinal direction X (Fig. 2 shows a plurality of elastic members 31). The leak-proof cuff-forming elastic members 31 extend from one end to the other end of the diaper 1 in the longitudinal direction X. The leak-proof cuff-forming elastic members 31 are stretchable over almost the entire area in the longitudinal direction X of the diaper 1. The leak-proof cuffs 3 stand up at least in the crotch area C as the elastic members 31 arranged in a stretched state contract when the diaper 1 is worn, thereby preventing the outflow of urine and other excrement in the lateral direction Y.

[0018] 1 and 2, the diaper 1 is provided with a fastening part on each of both side parts in one end region 1b in the longitudinal direction X of the absorbent main body 2. The fastening parts extend outward in the lateral direction Y from the sides of the absorbent main body 2. The fastening parts include a first fastening part 71 and a second fastening part 72 located outward in the longitudinal direction X from the first fastening part 71. In this embodiment, the fastening parts are provided on both side parts along the longitudinal direction X of the absorbent main body 2 in the back side part B.

[0019] In this embodiment, a pair of fastening tapes 6 is provided on both side edges along the longitudinal direction X of the back portion B of the diaper 1, and the fastening tape 6 includes fastening portions 71, 72. Specifically, the fastening tape 6 includes a tape base 61 joined to the absorbent main body 2, and fastening portions 71, 72 connected to the tape base 61 and extending outward in the lateral direction Y. Fastening regions 71a, 72a are provided on the skin-facing surfaces of the fastening portions 71, 72. The fastening regions 71a, 72a can be formed by, for example, fixing a male member of a hook-and-loop fastener or the like to the skin-facing surfaces of the fastening portions 71, 72.

[0020] As shown in Fig. 4, the diaper 1 has a fastening region 8 formed on the non-skin facing side of the other end region 1a in the longitudinal direction X of the absorbent main body 2, to which the fastening parts 71, 72 can be removably fastened. In this embodiment, the fastening region 8 is formed on the non-skin facing side of the absorbent main body 2 in the abdominal side portion A. The fastening region can be formed by bonding and fixing a female member of a hook-and-loop fastener to the non-skin facing surface of the backsheet 22 by a known bonding means (e.g., adhesive, heat sealing, etc.).

[0021] As shown in Figures 4 and 5, the fastening region 8 has a first design element 81 and a second design element 82. The first design element 81 extends from the outer side toward the inner side in the horizontal direction Y, and also extends from the inner side toward the outer side in the vertical direction X. The second design element 82 extends from the outer side toward the inner side in the horizontal direction Y, and also extends from the outer side toward the inner side in the vertical direction X. In this embodiment, the first design element 81 has a curved shape that is convex toward the inner side in the vertical direction X, and the second design element 82 has a curved shape that is convex toward the outer side in the vertical direction X (see Figure 5).

[0022] The first design element 81 may be of a single color or of multiple colors. Furthermore, the color of the first design element 81 may change stepwise or continuously from the base end to the tip end of the first design element 81. The second design element 82 may be of a single color or of multiple colors. Furthermore, the color of the second design element 82 may change stepwise or continuously from the base end to the tip end of the second design element 82. In this embodiment, the first design element 81 and the second design element 82 each have a continuously changing color. Specifically, the color continuously becomes darker from the outside to the inside in the lateral direction Y (see FIG. 5).

[0023] The fastening region 8 has an inner region 91 and an outer region 92 on either side of a center line CL that divides the fastening region 8 into two equal parts in the lateral direction Y. The inner region 91 is located on the center line CL side, and the outer region 92 is located outward in the lateral direction Y from the inner region 91. In this embodiment, as shown in Figs. 4 and 5, the fastening region 8 has an intermediate region 93 between the inner region 91 and the outer region 92. In this embodiment, the fastening region 8 has a background color consisting of a plurality of colors, as shown in Fig. 5. Specifically, the background color of the fastening region 8 gradually becomes darker from the outer region 92 toward the inner region 91. In this embodiment, the background color of the fastening region 8 gradually changes, and the inner region 91, the intermediate region 93, and the outer region 92 are regions with different background colors. When the background color of the fastening region 8 changes continuously, the fastening region 8 may be divided into three equal parts in the lateral direction Y, and the region located on the innermost side in the lateral direction Y may be the inner region 91, the region located on the outermost side in the lateral direction Y may be the outer region 92, and the region located between the inner region 91 and the outer region 92 may be the intermediate region 93. The adherend region 8 may or may not be line-symmetrical with respect to the center line CL. In this embodiment, the adherend region 8 is line-symmetrical with respect to the center line CL.

[0024] In the outer region 92, the contrast of the first design element 81 against the background color is stronger than in the inner region 91. Also, in the inner region 91, the contrast of the second design element 82 against the background color is stronger than in the outer region 92. * a* b * Color difference ΔE in color space * means that is large.

[0025] The color difference ΔE * can be measured by the following method. <Color difference ΔE * Measurement method> Color difference ΔE * The color difference is measured using a color difference meter. The color difference meter may be an eXact (measurement diameter φ2 mm) manufactured by X-Rite. * a * b * In the "Color Specification System," the lightness L * represents brightness, and chromaticity a * and chromaticity b * indicates the color direction, and a * is approximately red, -a * is roughly in the green direction, b * -b is roughly in the yellow direction * indicates a blue direction. And the color difference ΔE * is the value calculated by the following formula (1). Color difference ΔE * = [(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 ] 1 / 2 (1) ΔL * , Δa * , Δb * are the L between two contrasting colors, respectively. * Value, a * Value, b * The difference between the values. For example, ΔL * is ΔL * =L * 2-L * It is calculated by 1. In the measurement method using the eXact color difference meter, the measurement is performed under the conditions of a light source C / 2 and a viewing angle of D50 / 2°. The diaper to be measured is placed on a white board in an unfolded and stretched state, and the tip of the sensor of the color difference meter is directly contacted with the part of the diaper to be measured (the background part of the fastening area, the part of the fastening area where the first or second design element is formed, etc.), and the sensor is pressed against the part to be measured so that no gap is formed between the part to be measured and the tip of the sensor. If the part to be measured is smaller than the measurement diameter of the color difference meter, measurement is performed by joining parts to be measured cut out from multiple diapers together to make a size equal to or larger than the measurement diameter of the color difference meter. If the color intensity of the first or second design element is not constant, measurement is performed on the darkest part of the design element and the background part located near the darkest part, and the color difference ΔE * Request.

[0026] In the diaper 1 of the present embodiment, from the viewpoint of improving the fit, it is preferable that the fastening parts 71, 72 are fastened to the fastening region 8 so as to satisfy the following (1) and (2). (1) The first fastening portion 71 is fastened in an inclined state such that the base end is located on the inner side in the vertical direction X and the tip end is located on the outer side in the vertical direction X. (2) The second fastening portion 72 is fastened inward in the horizontal direction Y than the first fastening portion 71 with the base end portion positioned outward in the vertical direction X and the tip end portion positioned inward in the vertical direction X.

[0027] Fastening the first fastening part 71 so as to satisfy the above (1) can improve the fit of the diaper 1. Specifically, the sides of the crotch part C of the diaper 1 can be reliably fitted tightly around the legs of the wearer, improving the fit of the crotch part C of the diaper 1. This can prevent gaps from being generated around the legs of the wearer when the diaper 1 is worn, thereby preventing leakage of excrement.

[0028] The fitting property of the diaper 1 can also be improved by fastening the second fastening part 72 so as to satisfy the above condition (2). This point will be described below. When the diaper 1 is worn, the back portion B is supported by the buttocks of the wearer, so that the back portion B is less likely to slip off than the ventral portion A. Therefore, it is preferable to position the end of the back portion B outwardly in the vertical direction X from the end of the ventral portion A, so that the ventral portion A is hung from the back portion B. In this way, when the diaper 1 is worn, the ventral portion A is supported by the back portion B, which is less likely to slip off, and the entire diaper 1 is prevented from slipping off, so that the fit of the diaper 1 can be improved. By fastening the second fastening portion 72 in an inclined state such that the base end is located outwardly in the vertical direction X and the tip end is located inwardly in the vertical direction X, the end of the back portion B can be positioned outwardly in the vertical direction X from the end of the ventral portion A, so that the ventral portion A is hung from the back portion B. Furthermore, if the wearer has their legs closed when wearing the diaper 1, the closed legs may cause the crotch portion C of the diaper 1 to contract in the lateral direction Y, causing the side portion S of the back portion B to tilt relative to the longitudinal direction X (see FIG. 6). In FIG. 6, the dashed line represents the contour of the body of the wearer of the diaper 1. By fastening the second fastening portion 72 so as to satisfy the above (2), the diaper 1 can be fitted uniformly around the wearer's waist without bias, even if the side portion S of the back portion B is tilted relative to the longitudinal direction X.

[0029] In the diaper 1 of the present embodiment, the fastening parts 71, 72 can be easily fastened to the fastening region 8 so as to satisfy the above (1) and (2), and the diaper 1 has an excellent fit. This point will be explained below. When the fastening parts 71, 72 are fastened to the fastening region 8, as shown in Fig. 1, the fastening parts 71, 72 are pulled from the outer side to the inner side in the lateral direction Y of the lateral portion A of the diaper 1 with the side part of the back portion B of the diaper 1 overlapped with the side part of the lateral portion A of the diaper 1. Since the fastening parts 71, 72 are used by pulling them from the outer side to the inner side in the lateral direction Y of the lateral portion A of the diaper 1, a user of the diaper 1 such as a wearer, a parent, or a caregiver can easily focus on the outer side in the lateral direction Y of the lateral portion A of the diaper 1, which is the base end side of the fastening parts 71, 72 in the pulling direction. In the fastening region 8, the outer region 92 is located on the outer side in the lateral direction Y of the lateral portion A of the diaper 1, and in the outer region 92, the contrast of the first design element 81 against the background color is relatively strong. In other words, the first design element 81 stands out and is easily visible in the outer region 92. Since the first design element 81 extends from the outer side to the inner side in the horizontal direction Y and also extends from the inner side to the outer side in the vertical direction X, a user who visually sees the first design element 81 in the outer region 92 is likely to imagine pulling the first fastening part 71 located relatively on the inner side in the vertical direction X along the first design element 81. Therefore, in the diaper 1 of the present embodiment, it is easy to fasten the first fastening part 71 so as to satisfy the above (1), and the diaper 1 has an excellent fit. Since the contrast of the first design element 81 against the background color is stronger in the outer region 92 than in the inner region 91, the user is guided to fasten the first fastening portion 71 to the outer region 92 where the first design element 81 is more visible.

[0030] Furthermore, in the inner region 91, the contrast of the second design element 82 against the background color is relatively strong. In other words, in the inner region 91, the second design element 82 stands out and is easy to see. Since the second design element 82 extends from the outer side to the inner side in the horizontal direction Y and also extends from the outer side to the inner side in the vertical direction X, a user who sees the second design element 82 in the inner region 91 is likely to imagine pulling the second fastening portion 72 located relatively on the outer side in the vertical direction X along the second design element 82. Furthermore, since the contrast of the second design element 82 against the background color is stronger in the inner region 91 than in the outer region 92, the user is guided to fasten the second fastening portion 72 to the inner region 91 where the second design element 82 is more easily visible. Since the user is guided to fasten the first fastening part 71 to the outer region 92 and the second fastening part 72 to the inner region 91, in the diaper 1, it is easy to fasten the first fastening part 71 to the outer region 92 and the second fastening part 72 to the inner region 91. In other words, it is easy to fasten the second fastening part 72 to the inner side in the lateral direction Y than the first fastening part 71. Therefore, in the diaper 1 of this embodiment, the second fastening part 72 can be easily fastened so as to satisfy the above (2), and the diaper 1 has an excellent fit.

[0031] The L between the background color and the first design element 81 in the outer region 92 * a * b * The color difference of the color space is ΔE1 * In the inner region 91, the L between the background color and the first design element 81 is * a * b * The color difference of the color space is ΔE2 * When the color difference ΔE2 * The color difference ΔE1 * Ratio of ΔE1 * / ΔE2 * From the viewpoint of making the first design element 81 of the outer region 92 more easily visible and making it easier to fasten the first fastening part 71 so as to satisfy the above (1), the ratio ΔE1 is preferably 1.5 or more, more preferably 2.0 or more, and even more preferably 2.5 or more. * / ΔE2 * The upper limit of the ratio ΔE1 is not particularly limited, but is preferably 6.0 or less, more preferably 5.0 or less, and further preferably 4.0 or less. * / ΔE2 * is preferably 1.5 or more and 6.0 or less, more preferably 2.0 or more and 5.0 or less, and even more preferably 2.5 or more and 4.0 or less.

[0032] The color difference ΔE1* is preferably 5.0 or more, more preferably 7.5 or more, and even more preferably 10.0 or more, from the viewpoint of making the first design element 81 in the outer region 92 easier to see and making it easier to fasten the first fastening portion 71 so as to satisfy the above (1). In addition, the color difference ΔE1 * is preferably 35.0 or less, more preferably 30.0 or less, and even more preferably 25.0 or less. * The advantage of setting the upper limit of the color difference ΔE1 within the above range is as follows. * By setting the upper limit of ΔE1 within the above-mentioned range, it is possible to prevent the background color from becoming excessively light. This makes it possible to prevent the outer region 92 of the fastening region 8 from becoming difficult to recognize, and therefore makes it easier to fasten the first fastening part 71 to the outer region 92. In addition, in the outer region 92, when the background color and the first design element 81 are not the same color, the color difference ΔE1 * By setting the upper limit within the above-mentioned range, it is possible to prevent halation caused by the combination of the background color and the color of the first design element 81. This makes it possible to prevent the first design element 81 from becoming difficult to see, and makes it easy to pull the first fastening portion 71 along the first design element 81. From the viewpoint of achieving both of these, the color difference ΔE1 * is preferably 5.0 or more and 35.0 or less, more preferably 7.5 or more and 30.0 or less, and even more preferably 10.0 or more and 25.0 or less.

[0033] The color difference ΔE2 * In order to make the first design element 81 in the inner region 91 less noticeable and to make the first design element 81 in the outer region 92 relatively easier to see, the color difference ΔE2 *is preferably 12.5 or less, more preferably 10.0 or less, and even more preferably 7.5 or less. From the viewpoint of making the first design element 81 of the inner region 91 less conspicuous while preventing it from blending in with the background color and making it visible, the color difference ΔE2 is preferably 2.0 or more, more preferably 2.5 or more, and even more preferably 3.0 or more. From the viewpoint of achieving both of these, * is preferably 2.0 or more and 12.5 or less, more preferably 2.5 or more and 10.0 or less, and further preferably 3.0 or more and 7.5 or less.

[0034] The L between the background color and the second design element 82 in the outer region 92 * a * b * The color difference of the color space is ΔE3 * In the inner region 91, the L between the background color and the second design element 82 is * a * b * The color difference of the color space is ΔE4 * When the color difference ΔE3 * The color difference ΔE4 * Ratio of ΔE4 * / ΔE3 * From the viewpoint of making the second design element 82 of the inner region 91 more easily visible and making it easier to fasten the second fastening part 72 so as to satisfy the above (2), the ratio ΔE4 is preferably 1.5 or more, more preferably 2.0 or more, and even more preferably 2.5 or more. * / ΔE3 * The upper limit of the ratio ΔE4 is not particularly limited, but is preferably 6.0 or less, more preferably 5.0 or less, and even more preferably 4.0 or less. * / ΔE3 * is preferably 1.5 or more and 6.0 or less, more preferably 2.0 or more and 5.0 or less, and even more preferably 2.5 or more and 4.0 or less.

[0035] The color difference ΔE3 * From the viewpoint of making the second design element 82 in the outer region 92 less noticeable and making the second design element 82 in the inner region 91 relatively more visible, the color difference ΔE3 *is preferably 12.5 or less, more preferably 10.0 or less, and even more preferably 7.5 or less. From the viewpoint of making the second design element 82 in the outer region 92 less conspicuous while preventing it from blending in with the background color and making it visible, the color difference ΔE3 is preferably 2.0 or more, more preferably 2.5 or more, and even more preferably 3.0 or more. From the viewpoint of achieving both of these, * is preferably 2.0 or more and 12.5 or less, more preferably 2.5 or more and 10.0 or less, and further preferably 3.0 or more and 7.5 or less.

[0036] The color difference ΔE4 * is preferably 5.0 or more, more preferably 7.5 or more, and even more preferably 10.0 or more, from the viewpoint of making the second design element 82 in the inner region 91 easier to see and making it easier to fasten the second fastening portion 72 so as to satisfy the above (2). In addition, the color difference ΔE4 * is preferably 35.0 or less, more preferably 30.0 or less, and even more preferably 25.0 or less. * The advantage of setting the upper limit of the above range is as follows: In the inner region 91, when the background color and the second design element 82 are similar colors, the color difference ΔE4 * By setting the upper limit of ΔE4 within the above-mentioned range, it is possible to prevent the background color from becoming excessively light. This makes it possible to prevent the inner region 91 of the fastening region 8 from becoming difficult to recognize, and therefore makes it easier to fasten the second fastening part 72 to the inner region 91. In addition, in the inner region 91, when the background color and the second design element 82 are not the same color, the color difference ΔE4 * By setting the upper limit within the above-mentioned range, it is possible to prevent halation caused by the combination of the background color and the color of the second design element 82. This makes it possible to prevent the second design element 82 from becoming difficult to see, and makes it easy to pull the second fastening portion 72 along the second design element 82. From the viewpoint of achieving both of these, the color difference ΔE4 *is preferably 5.0 or more and 35.0 or less, more preferably 7.5 or more and 30.0 or less, and even more preferably 10.0 or more and 25.0 or less.

[0037] The first design element 81 and the second design element 82 may have the same color or different colors. From the viewpoint of making it easier to distinguish between the first design element 81 and the second design element 82 and making it easier for a user of the diaper 1 to fasten the fastening parts 71, 72 to the fastening area 8 so as to satisfy the above (1) and (2), it is preferable that the first design element 81 and the second design element 82 have different colors.

[0038] Whether the colors are different or not can be determined by the following method. <How to determine if the colors are different> Whether the colors are different or not is determined by the color difference ΔE * Specifically, the color difference ΔE * is preferably 5.0 or more, more preferably 7.5 or more, and even more preferably 10.0 or more, it is determined that the colors are different. If the first design element 81 or the second design element 82 is not a single color or the color density is not uniform, the determination is made by comparing the darkest parts of each design element 81, 82 in each of the inner region 91 and the outer region 92. If it is determined that the first design element 81 and the second design element 82 are different in color in both the inner region 91 and the outer region 92, it is considered that the first design element 81 and the second design element 82 are different in color throughout the entire fastening region 8.

[0039] It is also preferable that the first design element 81 and the second design element 82 are of similar colors. This makes it possible to prevent deterioration of visibility due to halation caused by the color combination when the fastening area 8 is viewed, and makes it easier to view the first design element 81 and the second design element 82. In addition, when the pattern of the fastening area 8 is printed, by making the first design element 81 and the second design element 82 of similar colors, it is possible to share printing ink, thereby reducing the number of steps in the printing process and also reducing costs. Being of similar colors means that the first design element 81 and the second design element 82 are of similar colors, * C * h * Difference in hue angle in color space Δh * is preferably 10° or less, more preferably 7.5° or less, and even more preferably 5° or less.

[0040] L * C * h * The hue angle in color space can be measured in the following manner. <L * C * h * How to measure the hue angle in a color space L * C * h * The color system is "L * a * b * In the "Color Specification System" * b * The plane is converted to polar coordinates, and the saturation is C * and the hue angle h * can be calculated using the following formula: Saturation C * =[(a * ) 2 +(b * ) 2 ] 1 / 2 hue angle h * =tan -1 (b * / a * )[degrees] In addition, L *C * h * L in color space * and L * a * b * L in color space * The measurement method is the same as above. * The method is the same as that described in Measurement Method.

[0041] If the color of the first design element 81 or the second design element 82 is not solid color or if the color intensity is not constant, the following method can be used to determine whether the first design element 81 and the second design element 82 are similar colors. First, we comprehensively calculate the hue angle h to cover the range of color hues and color shades. * Specifically, for each of the first design element 81 and the second design element 82, at least three locations with different color hues or color shading are visually selected, and the hue angle h * For example, if the color saturation of the first design element 81 and the second design element 82 is not constant, the hue angle h is measured at three points, namely, a dark portion, a light portion, and a portion whose color saturation is intermediate between the dark portion and the light portion. * The measurement point may be. Next, for each measurement point in the first design element 81, the difference in hue angle Δh between each measurement point in the second design element 82 is calculated. * Calculate. Then, the difference between all the calculated hue angles Δh * If the saturation C is within the above-mentioned range, the first design element 81 and the second design element 82 are determined to be similar colors. * is small and L * As the hue angle increases, the color approaches white. * 10 or less) are considered to be similar colors regardless of the hue angle.

[0042] It is also preferable that the first design element 81 and the second design element 82 are of similar colors but different color saturations. This makes it easy to distinguish the first design element 81 from the second design element 82 while recalling the common role of both of these two design elements 81, 82 as guides for tilting the fastening parts to fasten them, making it easier for the user of the diaper 1 to fasten the fastening parts 71, 72 to the fastening area 8 so as to satisfy the above (1) and (2). Similar colors but different color saturations refer to L * C * h * Difference in hue angle in color space Δh * is preferably 10° or less, more preferably 7.5° or less, and even more preferably 5° or less, while the difference in lightness ΔL * It means that the value is preferably 2.0 or more, more preferably 3.0 or more, and even more preferably 5.0 or more.

[0043] L * C * h * Lightness L in color system * The value can be measured by the following method. <L * C * h * Lightness L in color system * How to measure values> L * C * h * Lightness L in color system * The value is the above-mentioned < color difference ΔE * The measurement can be performed in the same manner as described in "Measurement method for the above". If the first design element 81 or the second design element 82 is not a single color, the darkest parts of the design elements 81, 82 are compared in each of the inner region 91 and the outer region 92. If it is determined that the color intensity of the first design element 81 and the second design element 82 differs in both the inner region 91 and the outer region 92, it is deemed that the color intensity of the first design element 81 and the second design element 82 differs throughout the entire attachment region 8.

[0044] The background color of the fastening area 8 may be multiple colors or may be a single color. The background color of the fastening area 8 may change stepwise or continuously. The background color of the fastening area 8 may change in the vertical direction X or in the horizontal direction Y.

[0045] It is preferable that the background color of the fastening region 8 changes from the outer region 92 to the inner region 91 so that the color becomes darker or lighter. This makes it possible to remind the wearer that the fit of the diaper 1 can be adjusted by the position in the lateral direction Y at which the fastening parts 71, 72 are fastened, when the wearer visually confirms the fastening region 8. For example, it can remind the wearer that in order to make the diaper 1 fit loosely, the fastening parts 71, 72 should be fastened on the outer region 92 side, and that in order to make the diaper 1 fit tightly, the fastening parts 71, 72 should be fastened on the inner region 91 side. It can also remind the wearer that if the wearer has a thicker body type, the fastening parts 71, 72 should be fastened on the outer region 92 side, and that if the wearer has a thinner body type, the fastening parts 71, 72 should be fastened on the inner region 91 side.

[0046] In addition, the background color of the outer region 92 has a larger linear relationship with the color of the portion of the non-skin-facing surface of the diaper 1 other than the fastening region 8 than the background color of the inner region 91. * a * b * Color difference ΔE in color space * In other words, it is preferable that the background color of the outer region 92 is closer to the color of the portion of the non-skin-facing surface of the diaper 1 other than the fastening region 8 than that of the inner region 91. This allows the first design element 81 to stand out more in the outer region 92.

[0047] The difference between the background color of the outer region 92 and the color of the portion of the non-skin-facing surface of the diaper 1 other than the fastening region 8 is * a * b *The color difference in the color space is ΔE5 * The L between the background color of the inner region 91 and the color of the portion of the non-skin facing surface of the diaper 1 other than the fastening region 8 is * a * b * The color difference in the color space is ΔE6 * When the color difference ΔE6 * The color difference ΔE5 * Ratio of ΔE5 * / ΔE6 * is preferably 0.8 or less, more preferably 0.75 or less, and even more preferably 0.67 or less. In addition, the ratio ΔE5 * / ΔE6 * is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more. * / ΔE6 * By setting the lower limit within the above-mentioned range, it is possible to prevent the background color of the outer region 92 from becoming too close to the color of areas other than the fastening region 8 on the non-skin-facing surface of the diaper 1 than to the color of the inner region 91. This prevents the background color of the outer region 92 from becoming indistinguishable from areas other than the fastening region 8 on the non-skin-facing surface of the diaper 1, making it difficult to find the location of the fastening region 8 and therefore difficult to fasten. From the viewpoint of achieving both of these, the ratio ΔE5 * / ΔE6 * is preferably 0.05 or more and 0.8 or less, more preferably 0.1 or more and 0.75 or less, and further preferably 0.2 or more and 0.67 or less.

[0048] The color difference ΔE5 * is preferably 40 or less, more preferably 30 or less, and even more preferably 25 or less, from the viewpoint of making the first design element 81 stand out more in the outer region 92. In addition, from the viewpoint of preventing the background color of the outer region 92 from becoming too close to the color of the portion other than the fastening region 8 on the non-skin facing surface of the diaper 1, which makes it difficult to find the location of the fastening region 8 and therefore difficult to fasten, the color difference ΔE5 * is preferably 5 or more, more preferably 7.5 or more, and even more preferably 10 or more.* is preferably 5 or more and 40 or less, more preferably 7.5 or more and 30 or less, and further preferably 10 or more and 25 or less.

[0049] The color difference ΔE6 * is preferably 70 or less, more preferably 60 or less, and even more preferably 55 or less, from the viewpoint of preventing the first design element 81 from becoming difficult to see due to blending with the background color in the inner region 91. Also, from the viewpoint of preventing the color of the inner region 91 of the fastening part from becoming too light, making it difficult to find the location of the inner region 91 and thus difficult to fasten, the color difference ΔE6 * is preferably 20 or more, more preferably 25 or more, and even more preferably 30 or more. * is preferably 20 or more and 70 or less, more preferably 25 or more and 60 or less, and further preferably 30 or more and 55 or less.

[0050] In this embodiment, the fastening region 8 is divided into two or more small regions 91, 92, 93 in the horizontal direction Y on both sides of the center line CL, as shown in FIG. 5. The small regions 91, 92, 93 have different background colors. In this embodiment, the fastening region 8 is divided into three small regions 91, 92, 93, and the small regions 91, 92, 93 correspond to the inner region 91, the outer region 92, and the middle region 93, respectively. The background color of the small regions 91, 92, 93 may be a single color or multiple colors. The background color of the small regions 91, 92, 93 may change in either the vertical direction X or the horizontal direction Y, or both. The background color of the small regions 91, 92, 93 may change to a darker color or a lighter color. The background color of the small regions 91, 92, 93 may change in a stepwise manner or continuously. In this embodiment, the background color of the small regions 91, 92, and 93 is a single color.

[0051] The multiple small regions 91, 92, 93 may have the same background color or different background colors. In this embodiment, the multiple small regions 91, 92, 93 have different background colors. The background colors of the small regions 91, 92, 93 may change so that the color becomes darker or lighter from the small region 92 farther from the center line CL, i.e., the outer region 92, to the small region 91 closer to the center line CL, i.e., the inner region 91. In this embodiment, the background colors of the small regions 91, 92, 93 change so that the color becomes darker from the outer region 92 to the inner region 91.

[0052] In this embodiment, as shown in Fig. 5, the small regions 91, 92, and 93 have indicia 91a, 92a, and 93a corresponding to the distance from the center line CL. Examples of the indicia 91a, 92a, and 93a include pictures, symbols, letters, and numbers. In this embodiment, the indicia 91a, 92a, and 93a are numbers, and the numbers of the indicia 91a, 93a, and 92a increase from the small region 91 closest to the center line CL to the small region 92 farthest from the center line CL. The indicia 91a, 92a, 93a of the small regions 91, 92, 93 serve as markers for the fastening positions when the fastening parts 71, 72 are fastened to the fastening region 8, so that it is possible to adjust the fit of the diaper 1 by adjusting the positions in the lateral direction Y at which the fastening parts 71, 72 are fastened. From the viewpoint of achieving this effect more significantly, it is preferable that the background color of the small regions 91, 92, 93 is a single color, and the color density changes to become darker or lighter toward the small region 91 closer to the center line CL, i.e., the inner region 91. Moreover, from the viewpoint of facilitating fastening of the fastening parts 71, 72 so that the fit is the same on both sides of the center line CL in the fastening region 8, it is preferable that the fastening region 8 is symmetrical with respect to the center line CL.

[0053] In addition, it is preferable that the background colors of the small regions 91, 92, and 93 are similar colors. This prevents deterioration of visibility due to halation caused by the color combination when the fastening region 8 is viewed, and makes it easier to view the entire fastening region 8 with the background colors of the small regions 91, 92, and 93, as well as the first design element 81 and the second design element 82. In addition, when the pattern of the fastening region 8 is printed, the background colors of the small regions 91, 92, and 93 are similar colors, which allows the same printing ink to be used, thereby reducing the number of steps in the printing process and also reducing costs. It is also preferable that the background colors of the small regions 91, 92, 93 have different color intensities, and more preferably, the color intensity changes so as to become darker or lighter toward the small region 91 closer to the center line CL, i.e., the inner region 91. This makes it easier to recall that the fit of the diaper 1 can be adjusted by shifting the fastening positions of the fastening parts 71, 72 in the fastening region 8 in the lateral direction Y.

[0054] The first design element 81 has a curved shape that is convex toward the inside in the vertical direction X, and it is preferable that the angle with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side. This makes it easier to imagine pulling the first fastening part 71 outward in the vertical direction X when viewing the first design element 81, and makes it easier to fasten the first fastening part 71 so as to satisfy the above (1).

[0055] Whether or not the angle of the first design element 81 with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side can be determined by the following method. <Method of Determining Whether the Angle of the First Design Element 81 With Respect to a Line Parallel to the Horizontal Direction Y Increases from the Outer Region 92 Side to the Inner Region 91 Side> First, a virtual line V1 parallel to the horizontal direction Y is drawn (see FIG. 7). The virtual line V1 is drawn such that among the intersections between the virtual line V1 and the first design element 81, an intersection point P1 located on the inner side in the horizontal direction Y is located in the inner region 91. Then, the angle θ1 between the virtual line V1 and a tangent K1 to the first design element 81 at the intersection point P1 is measured. Next, a virtual line V2 parallel to the horizontal direction Y is drawn (see FIG. 7). The virtual line V2 is drawn such that among the intersections between the virtual line V2 and the first design element 81, an intersection point P2 located on the inner side in the horizontal direction Y is located in the outer region 92. Then, the angle θ2 between the tangent K2 to the first design element 81 at the intersection point P2 and the virtual line V1 is measured (see FIG. 7). Then, the angles θ1 and θ2 are compared, and if the angle θ1 is larger, it is determined that the angle of the first design element 81 with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side.

[0056] The second design element 82 has a curved shape that is convex outward in the vertical direction X, and it is preferable that the angle with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side. This makes it easier to imagine pulling the second fastening part 72 inward in the vertical direction X when viewing the second design element 82, and makes it easier to fasten the second fastening part 72 so as to satisfy the above (2).

[0057] Whether or not the angle of the second design element 82 with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side can be determined by the following method. <Method of Determining Whether the Angle of the Second Design Element 82 With Respect to a Line Parallel to the Horizontal Direction Y Increases from the Outer Region 92 Side to the Inner Region 91 Side> First, a virtual line V3 parallel to the horizontal direction Y is drawn (see FIG. 7). The virtual line V3 is drawn such that among the intersections between the virtual line V3 and the second design element 82, an intersection point P3 located on the inner side in the horizontal direction Y is located in the inner region 91. Then, an angle θ3 between the virtual line V3 and a tangent K3 to the second design element 82 at the intersection point P3 is measured. Next, an imaginary line V4 parallel to the horizontal direction Y is drawn (see FIG. 7). The imaginary line V4 is drawn such that among the intersection points between the imaginary line V4 and the second design element 82, an intersection point P4 located on the inner side in the horizontal direction Y is located in the outer region 92. Then, an angle θ4 between the tangent K4 to the second design element 82 at the intersection point P4 and the imaginary line V4 is measured (see FIG. 7). Then, the angles θ3 and θ4 are compared, and if the angle θ3 is larger, it is determined that the angle of the second design element 82 with respect to a line parallel to the horizontal direction Y increases from the outer region 92 side toward the inner region 91 side.

[0058] It is preferable that the first design element 81 and the second design element 82 indicate the direction from the outer region 92 side to the inner region 91 side. Examples of a mode indicating the direction from the outer region 92 side to the inner region 91 side include a mode in which the first design element 81 and the second design element 82 are arrows (see FIG. 5), a mode in which the thickness of the first design element 81 and the second design element 82 becomes thinner stepwise or continuously from the outer region 92 side to the inner region 91 side, and a mode in which the first design element 81 and the second design element 82 are configured with dashed lines in which line segments and blank spaces are alternately arranged, and the lengths of the line segments and / or the intervals between the line segments become shorter stepwise or continuously from the outer region 92 side to the inner region 91 side. Since the first design element 81 and the second design element 82 indicate the direction from the outer region 92 side to the inner region 91 side, it is easier to imagine the direction in which to pull the first fastening portion 71 and the second fastening portion 72.

[0059] 2, the diaper 1 of this embodiment has an elastic member 55 that stretches in the lateral direction Y disposed at the other end in the longitudinal direction X, i.e., at the end of the abdominal portion A. The elastic member 55 is disposed between the top sheet 21 and the back sheet 22. When the elastic member 55 contracts in the lateral direction Y, waist gathers are formed in the portion of the abdominal portion A that is disposed around the waist of the wearer.

[0060] It is preferable that, in the natural state, the other edge 1e of the diaper 1 in the longitudinal direction X, i.e., the edge 1e on the abdominal side A side, on at least one of the two sides of the center line CL, is generally parallel to the second design element 82 (see FIG. 8). This allows the diaper 1 to be worn in a more snug fit. This point will be explained below. When putting on the diaper 1, as shown in Fig. 10, the side of the abdominal portion A is grasped and pulled toward the back portion B, and the second fastening portion 72 is grasped and pulled toward the center line CL, so that the second fastening portion 72 is fastened to the fastening region 8. When the edge 1e of the abdominal portion A side and the second design element 82 are substantially parallel to each other in the natural state of the diaper 1, the user of the diaper 1 can easily imagine the pulling direction with the hand grasping the side of the abdominal portion A and the hand grasping the second fastening portion 72, and therefore the diaper 1 can be put on in a more fitted state. From the viewpoint of achieving this effect more significantly, it is preferable that the other edge 1e of the diaper 1 in the longitudinal direction X, i.e., the edge 1e of the abdominal portion A side, and the second design element 82 are substantially parallel to each other on both sides of the center line CL in the natural state of the diaper 1.

[0061] Whether or not the other end edge 1e of the diaper 1 in the longitudinal direction X is substantially parallel to the second design element 82 when the diaper 1 is in its natural state can be determined by the following method. <Method of Determining Whether the Other End Edge 1e of the Diaper 1 in the Longitudinal Direction X is Approximately Parallel to the Second Design Element 82 When the Diaper 1 is in a Natural State> First, the diaper 1 is laid out in an unfolded state, and a line L1 parallel to the center line CL is drawn with an oil-based pen or the like so as to pass through the outer region 92 of the fastening region 8 (see FIG. 9(a)). Furthermore, with the diaper 1 in an unfolded state, a line L2 parallel to the center line CL is drawn with an oil-based pen or the like so as to pass through the second design element 92 in the inner region 91 (see FIG. 9(a)). Thereafter, the diaper 1 is left in an unfolded state for 5 minutes to return the diaper 1 to its natural state. If an elastic member that stretches in the lateral direction Y is provided at the end of the abdominal portion A of the diaper 1, the end is stretched five times in the lateral direction Y by hand, and the diaper 1 is then left in an unfolded state for 5 minutes. Next, at an intersection Q1 between the line L1 and the other edge 1e in the longitudinal direction X of the diaper in the natural state, an angle α1 between the line L3 parallel to the transverse direction Y and the edge 1e is measured (see FIG. 9(b)). In addition, at an intersection Q2 located on the inner side in the transverse direction Y among the intersections between the line L2 and the second design element 82 in the natural state, an angle α2 between a tangent L4 of the second design element 82 and a line L5 parallel to the transverse direction Y is measured. When the difference between the angles α1 and α2 is preferably 30° or less, more preferably 20° or less, and even more preferably 10° or less, it is determined that the other edge 1e of the diaper 1 in the longitudinal direction X is approximately parallel to the second design element 82 when the diaper 1 is in its natural state.

[0062] In this embodiment, the fastening region 8 is formed by disposing a sheet (hereinafter also referred to as "fastening region forming sheet") 83 having a first design element 81 and a second design element 82 on the non-skin facing side of the other end region 1a in the longitudinal direction X of the absorbent body 2. The fastening region forming sheet 83 can be formed, for example, by cutting a sheet (hereinafter also referred to as "precursor sheet") 83A in which the first design element 81 and the second design element 82 are intermittently arranged in the longitudinal direction X at an arbitrary position F in the longitudinal direction X (see FIG. 11). Since the fastening region 8 is formed by the fastening region forming sheet 83 thus formed, when the precursor sheet 83A is cut to form the fastening region forming sheet 83, it is not necessary to control the cutting position of the precursor sheet 83A so as to cut the precursor sheet 83A at a specific position. Therefore, the fastening region forming sheet 83 can be manufactured by a simple process, and the diaper 1 can be manufactured at low cost.

[0063] Next, the material of the diaper 1 will be described. The top sheet 21 may be a liquid-permeable sheet, such as a nonwoven fabric or a perforated film. The surface of the top sheet facing the skin may be uneven. For example, a plurality of scattered convex portions may be formed on the surface of the top sheet facing the skin. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the top sheet facing the skin. For such a purpose, the top sheet 21 may be formed using two or more sheets of nonwoven fabric.

[0064] On the other hand, the back sheet 22 may be, for example, a liquid-impermeable film or a spunbond-meltblown-spunbond laminated nonwoven fabric. A liquid-impermeable film may be provided with a plurality of micropores to impart water vapor permeability to the film. In order to further improve the feel of the disposable diaper, a sheet with a good texture such as a nonwoven fabric may be laminated on the outer surface of the back sheet.

[0065] The absorbent core 24 is composed of, for example, a laminate of hydrophilic fibers such as cellulose including pulp, a mixed laminate of the hydrophilic fibers and an absorbent polymer, an absorbent polymer pile, a laminated structure in which an absorbent polymer is supported between two absorbent sheets, etc. As the core wrap sheet 25, for example, a tissue paper made of hydrophilic fibers, a nonwoven fabric having liquid permeability, etc. can be used.

[0066] For example, among fastening systems that combine loop and hook materials, a loop material laminated onto a resin film substrate, a loop material made of nonwoven fabric, etc. can be used as the fastening region forming sheet 83. Note that the fastening system is not limited to loop and hook materials, and the fastening region forming sheet 83 can be a resin film with a release treatment applied to the surface to which the adhesive tape is attached, etc., among fastening systems that use an adhesive.

[0067] Although the disposable diaper of the present invention has been described above based on the preferred embodiments, the disposable diaper of the present invention is not limited to the above-mentioned embodiments. For example, in the present embodiment, the fastening portions 71, 72 are formed in the fastening tape 6 provided on both side edges of the diaper 1 in the longitudinal direction X. Alternatively, the fastening portions 71, 72 may be formed integrally with both side edges of the diaper 1 in the longitudinal direction X, which protrude in the transverse direction Y. The diaper 1 may also have an outer casing on the non-skin facing side of the absorbent body 2 that forms the outer surface of the diaper 1, and an attachment region 8 may be formed on the non-skin facing side of the outer casing.

[0068] In the present embodiment, the adherend region 8 is divided into three small regions 91, 92, and 93 in the lateral direction Y, but the adherend region 8 may be divided into four or more small regions.

[0069] Furthermore, the planar shape of the absorber 23 is not limited to an hourglass shape in which the central region in the longitudinal direction X of the absorber 23 is narrowed inward in the lateral direction Y, and the planar shape may be rectangular. [Explanation of symbols]

[0070] 1. Disposable diapers 2. Absorbent body 21 Surface sheet 22 Back sheet 23 Absorbent 24 Absorbent Core 25 Core wrap sheet 3 Leak proof cuff 71 1st fastening part 72 Second fastening part 8 Attached area 81 First Design Element 82 Second Design Element 91 Inner area 92 Outer area A Ventral part B Dorsal part C Inseam X vertical direction Y Horizontal

Claims

1. an absorbent body having a longitudinal direction and a lateral direction; a fastening portion extending outward in the lateral direction from each of both side portions in one end region in the longitudinal direction of the absorbent main body; A disposable diaper having a fastening region to which the fastening part can be detachably fastened formed on a non-skin-facing surface side of the other end region in the longitudinal direction of the absorbent main body, The fastening portion includes a first fastening portion and a second fastening portion located outward from the first fastening portion in the vertical direction, The fastening area is a first design element extending from the outer side toward the inner side in the horizontal direction and from the inner side toward the outer side in the vertical direction; a second design element extending from the outer side toward the inner side in the horizontal direction and from the outer side toward the inner side in the vertical direction, The fastening region has, on both sides of a center line that divides the fastening region into two equal parts in the horizontal direction, an inner region located on the center line side, and an outer region located outward in the horizontal direction from the inner region, the outer region has a stronger contrast of the first design element against a background color than the inner region; The second design element has a stronger contrast with a background color in the inner region than in the outer region.

2. 10. The disposable diaper of claim 1, wherein the first design element and the second design element are different colors.

3. 3. The disposable diaper according to claim 1, wherein the background color of the fastening region changes so that the color density becomes darker or lighter from the outer region toward the inner region.

4. 3. The disposable diaper according to claim 1, wherein the background color of the outer region has a smaller color difference ΔE* in the L*a*b* color system from the color of the portion of the non-skin-facing surface of the disposable diaper other than the fastening region than the background color of the inner region.

5. The fastening area is divided into two or more small areas having different background colors in the horizontal direction on both sides of the center line, the background color of the small area of ​​the fastening area is a single color; the background color of the small regions changes from the small regions farther from the center line to the small regions closer to the center line so that the color becomes darker or lighter; The small area has an indication according to a distance from the center line, The disposable diaper according to claim 1 or 2, wherein the fastening region is symmetrical with respect to the center line.

6. The fastening area is divided into two or more small areas having different background colors in the horizontal direction on both sides of the center line, The disposable diaper according to claim 1 or 2, wherein the background colors of the plurality of small regions are similar but have different color intensities.

7. 3. The disposable diaper according to claim 1, wherein the first design element and the second design element are of the same color but different in color intensity.

8. The fastening area has a background color in the horizontal direction on both sides of the center line. is divided into two or more different subregions, The disposable diaper according to claim 1 or 2, wherein the background colors of the plurality of small regions, the color of the first design element, and the color of the second design element are similar colors but have different color intensities.

9. 3. The disposable diaper according to claim 1, wherein the fastening region is formed by cutting a sheet on which the first design elements and the second design elements are arranged intermittently in the vertical direction at any position in the vertical direction, and placing the cut sheet on the non-skin-facing side of the other end region of the absorbent body in the vertical direction.

10. the first design element is convexly curved inward in the vertical direction, and the angle with respect to a line parallel to the horizontal direction increases from the outer region toward the inner region; 3. The disposable diaper according to claim 1, wherein the second design element is convexly curved outward in the longitudinal direction, and the angle of the second design element relative to a line parallel to the transverse direction increases from the outer region toward the inner region.

11. The disposable diaper according to claim 1 or 2, wherein the first design element and the second design element indicate a direction from the outer region toward the inner region.

12. An elastic member stretchable in the horizontal direction is disposed at the other end of the disposable diaper in the vertical direction, 3. The disposable diaper according to claim 1, wherein, when the disposable diaper is in its natural state, on at least one of the sides of the center line, the other longitudinal edge of the disposable diaper and the second design element are approximately parallel to each other.

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