Absorbent article

Abstract

An absorbent article (1) provided with a crotch elastic region (ER) in a lower crotch portion, having a peripheral region (AR) surrounding the crotch elastic region (ER), having a background color region (61) and a certain specific color region (60) different from the background color when the absorbent article (1) is viewed from a non-skin side, in which, when a ratio obtained by dividing a total area of the specific color region (60) provided in the crotch elastic region (ER) by an area of the crotch elastic region (ER) is taken as a first area ratio, and a ratio obtained by dividing a total area of the specific color region (60) provided in the peripheral region (AR) by an area of the peripheral region (AR) is taken as a second area ratio, an absolute value of a difference between the first area ratio and the second area ratio is above the first area ratio, or above the second area ratio.

Description

Technical Field

[0001] This invention relates to absorbent articles. Background Technology

[0002] Patent Document 1 discloses a disposable diaper with a first elastic member in the buttocks extending along its long side, located on the non-contact side of the skin, closer to the absorbent core. Through the contraction of this first elastic member, upward tension is generated, reducing the gap between the diaper and the wearer's crotch. This improves the diaper's ability to prevent leakage of excrement and enhances the sense of security during wear due to a proper fit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-131196

[0006] The technical problem that the invention aims to solve

[0007] However, as in Patent Document 1, where the elastic element is only placed in the buttocks, there is a concern that users may not notice its presence. In this case, while the elastic element improves the fit to the wearer's groin area, the user is unaware of this and may experience ongoing anxiety about leakage during wear. Furthermore, due to experiences of the absorbent core sagging from the pressure on the inner thighs or from the weight of absorbing excrement, creating gaps in the groin area and making leakage more likely, as well as reducing comfort, users tend to prefer products with absorbent cores that are less prone to sagging. Therefore, by recognizing before use that the elastic element prevents the absorbent core from sagging, users can use absorbent items with confidence. Summary of the Invention

[0008] The present invention was made in view of the aforementioned problems, and its object is to provide an absorbent article that allows the user to easily recognize, before use, that provides a good fit to the wearer's groin area and that prevents the absorbent core from sagging.

[0009] Means for solving technical problems

[0010] The main invention used to achieve the above objectives is,

[0011] An absorbent article having an absorbent core,

[0012] In the unfolded and elongated state

[0013] It has intersecting long sides, left and right directions, and thickness direction.

[0014] It has an elastic region in the groin area defined by a telescopic portion of an elastic component, which is positioned further away from the skin than the absorbent core and extends and retracts along the long side.

[0015] At least a portion of the elastic crotch area is provided in the lower crotch region, which is the central region when the absorbent article is divided into three equal parts along its long side.

[0016] It has a peripheral area surrounding the elastic area in the groin.

[0017] The surrounding area is defined as follows: in the left-right direction, it extends from a position half the width of the elastic crotch area to the left of the left end of the elastic crotch area, and from a position half the width of the elastic crotch area to the right of the right end of the elastic crotch area; and in the long-side direction, it extends from a position half the width of the elastic crotch area to the position half the width of the elastic crotch area to the other end of the elastic crotch area.

[0018] When viewing the absorbent article from the non-skin side...

[0019] An area having a background color, and an area of ​​a specific color that is different from the background color.

[0020] The background color area is the area that occupies the largest area in the lower crotch region.

[0021] The ratio obtained by dividing the total area of ​​the specific color regions located in the elastic area under the crotch by the area of ​​the elastic area under the crotch is used as the first area ratio.

[0022] When the total area of ​​the specific color regions set in the surrounding area is divided by the area of ​​the surrounding area, the ratio obtained is used as the second area ratio.

[0023] The absolute value of the difference between the first area ratio and the second area ratio is greater than or greater than the first area ratio.

[0024] Other features of the invention will become clear from the description in this specification and the accompanying drawings.

[0025] Invention Effects

[0026] According to the present invention, an absorbent article is provided in which the user can easily recognize, before use, that the absorbent core fits well to the wearer's groin and is unlikely to sag. Attached Figure Description

[0027] Figure 1This is a schematic front view showing the underwear-type disposable diaper 1.

[0028] Figure 2 This is a schematic top view showing the diaper 1 in its unfolded and elongated state as viewed from the skin side.

[0029] Figure 3 It is shown Figure 2 A rough cross-sectional view at the CC line.

[0030] Figure 4 This is a schematic cross-sectional view showing the absorbent body 10.

[0031] Figure 5 This is a diagram illustrating the configuration of the elastic member 40 in the crotch area.

[0032] Figure 6 This is a diagram illustrating a modified configuration of the crotch elastic member 40.

[0033] Figure 7 This is a diagram illustrating a modified configuration of the crotch elastic member 40.

[0034] Figure 8 This is an explanatory diagram showing a specific color region 60.

[0035] Figure 9 This is an enlarged view showing the elastic region ER in the groin area and the surrounding region AR.

[0036] Figure 10A as well as Figure 10B This is an explanatory diagram showing a variation of a specific color region 60.

[0037] Figure 11A as well as Figure 11B This is an explanatory diagram showing a variation of a specific color region 60.

[0038] Figure 12 This is an explanatory diagram showing a variation of a specific color region 60.

[0039] Figure 13A It is a part of the cross-sectional view of the absorbent body 10. Figure 13B This is an explanatory diagram showing the joint 70 between the back sheet 13 and the elastic member cover sheet 17.

[0040] Figure 14 This is an explanatory diagram showing a specific colored area 60 in the diaper 1 according to the second embodiment. Detailed Implementation

[0041] From the description in this specification and the accompanying drawings, at least the following matters become clear.

[0042] Method 1 is an absorbent article having an absorbent core. In its unfolded and extended state, it has intersecting long side directions, left-right directions, and thickness directions. It has a crotch elastic region defined by a stretchable portion of a crotch elastic member. This crotch elastic member is positioned further from the skin than the absorbent core and stretches along the long side. At least a portion of the crotch elastic region is located in the crotch area, which is the central region when the absorbent article is divided into three equal parts along the long side. It has a peripheral region surrounding the crotch elastic region, which is defined as follows: in the left-right direction, from a position half the width of the crotch elastic region to the left, extending away from the left end of the crotch elastic region, to a position half the width of the crotch elastic region to the right, extending away from the right end of the crotch elastic region; and in the long side direction, from a position further from the crotch elastic core to the crotch area... The range from one end of the elastic region away from the width of the elastic region to the other end of the elastic region away from the width of the elastic region in the crotch, when viewed from the non-skin side, includes a background color area and a specific color area different from the background color, wherein the background color area is the area with the largest area in the crotch region. When the ratio of the total area of ​​the specific color area provided in the elastic region in the crotch to the area of ​​the elastic region in the crotch is used as a first area ratio, and the ratio of the total area of ​​the specific color area provided in the peripheral area to the area of ​​the peripheral area is used as a second area ratio, the absolute value of the difference between the first area ratio and the second area ratio is greater than or greater than the first area ratio.

[0043] According to Method 1, the difference in area ratio between the elastic area in the crotch region and the specific colored area in the surrounding region increases, making the elastic area in the crotch region more prominent. Therefore, before using absorbent products, users are more likely to notice the presence of the elastic component in the crotch region and recognize that the absorbent product fits the wearer's crotch region well and is less likely to sag. Thus, concerns about leakage and poor wearing comfort are eliminated, allowing users to use absorbent products with confidence.

[0044] (Method 2) An absorbent article as described in Method 1,

[0045] In the extended and stretched state, a region of a specific color is provided in at least one of the elastic region under the crotch and the surrounding region, where the length of the long side is longer than the length of the left and right sides.

[0046] According to method 2, users who see a specific color area that is longer along the long side are more likely to be impressed by the stretching and contraction of the elastic component in the crotch direction. Therefore, users are more likely to recognize that the elastic component in the crotch maintains a state that pushes the absorbent core upwards towards the skin, and that the absorbent item fits the wearer's crotch well and is unlikely to sag.

[0047] (Method 3) An absorbent article as described in Method 2,

[0048] In the extended and stretched state, in the elastic region under the crotch, multiple strip-shaped areas of the specific color are arranged in the left-right direction along the long side.

[0049] According to method 3, the specific color area becomes a long and narrow area. Users who see this area are more likely to be impressed by the stretching and contraction of the elastic component in the crotch direction. Therefore, users are more likely to recognize that the absorbent item is a product that fits snugly against the wearer's crotch and is less likely to sag.

[0050] (Method 4) An absorbent article as described in any one of Methods 1 to 3,

[0051] In the unfolded and extended state, with respect to at least one of the long side direction and the left and right directions, the total length of the specific color region disposed in one of the regions of the crotch elastic region and the peripheral region is more than half the length of the region of that one side.

[0052] According to method 4, a specific color area is set in one of the wide areas in at least one of the directions of the long side and the left and right sides. Therefore, the elastic area under the crotch is conspicuous, and the user can easily notice the presence of the elastic component under the crotch.

[0053] (Method 5) An absorbent article as described in any one of methods 1 to 4,

[0054] The first area ratio is 1 / 2 or more, or the second area ratio is 1 / 2 or more.

[0055] According to method 5, compared with the case where the first area ratio is less than 1 / 2 or the second area ratio is less than 1 / 2, the elastic area in the crotch is more prominent, and users can easily notice the existence of the elastic component in the crotch.

[0056] (Method 6) An absorbent article as described in any one of methods 1 to 5,

[0057] There are no areas in the surrounding area that have the specific color set.

[0058] According to method 6, since the user focuses directly on the elastic area under the crotch, the presence of the elastic component under the crotch is easily noticed based on the wrinkles caused by the contraction of the elastic component.

[0059] (Method 7) An absorbent article as described in any one of methods 1 to 6,

[0060] In the extended and stretched state, in the groin elastic region, multiple linear groin elastic components are arranged in the left-right direction, and the telescopic portion of the groin elastic component has a portion that overlaps with the region of the specific color in the thickness direction.

[0061] According to method 7, since the user focuses directly on the stretching portion of the elastic component in the crotch, the presence of the elastic component in the crotch is easily noticed based on the wrinkles created by the contraction of the elastic component in the crotch.

[0062] (Method 8) An absorbent article as described in any one of methods 1 to 7,

[0063] In the extended and stretched state, in the groin elastic region, multiple linear groin elastic components are arranged in the left-right direction. In the region further outward in the long side direction than the groin elastic region, the non-stretchable portion of the groin elastic component has a portion that does not overlap with the region of the specific color in the thickness direction.

[0064] According to method 8, it is possible to prevent users from mistakenly perceiving the non-stretchable portion of the crotch elastic component as stretchable, and to accurately grasp the actual stretching position. Furthermore, the non-stretchable portion of the freely stretchable crotch elastic component becomes less noticeable, suppressing the diminished impression of the crotch elastic component stretching along its long side. Additionally, it also helps to prevent a decrease in the aesthetic appeal of absorbent materials.

[0065] (Method 9) An absorbent article as described in any one of Methods 1 to 8,

[0066] The back sheet is liquid-impermeable, and a non-skin side sheet is disposed at a position closer to the non-skin side than the back sheet. The groin elastic member is disposed between the back sheet and the non-skin side sheet. The back sheet is colored to form an area with the specific color. In the unfolded and stretched state, multiple linear groin elastic members are arranged in the groin elastic area in the left-right direction. The joint between the multiple groin elastic members arranged in the left-right direction is provided between the back sheet and the non-skin side sheet.

[0067] According to method 9, the lifting of the non-skin side panel relative to the back panel can be suppressed, resulting in improved visual visibility of the specific color area on the back panel. Therefore, the elastic area in the crotch is more prominent, making it easier for the user to recognize the presence of the elastic component in the crotch.

[0068] (Method 10) An absorbent article as described in any one of methods 1 to 9,

[0069] The device includes a liquid-impermeable back panel and a non-skin side panel positioned further away from the skin than the back panel. A groin elastic member is disposed between the back panel and the non-skin side panel. In the unfolded and extended state, multiple linear groin elastic members are arranged in the left-right direction within the groin elastic region. A joint between the multiple groin elastic members arranged in the left-right direction and the back panel and the non-skin side panel is provided between them. The joint extends to a position further outward along the long side of the groin elastic region than the groin elastic region itself.

[0070] According to method 10, the bending of the non-stretchable portion of the crotch elastic member in the lateral direction is restricted by the joint. Therefore, it is possible to suppress the reduction of the impression of the crotch elastic member that stretches in the long side direction. In addition, it is also possible to suppress the reduction of the appearance (aesthetics) of the absorbent article.

[0071] (Method 11) An absorbent article as described in any one of methods 1 to 10,

[0072] The area with the specific color is formed by coloring the elastic component in the crotch.

[0073] According to method 11, users can easily focus on the elastic component under the crotch, easily notice its existence, and correctly grasp the actual stretching position.

[0074] (Method 12) An absorbent article as described in any one of methods 1 to 11,

[0075] In its unfolded and elongated state, the end of at least one side in the long side direction has a waist elastic region that stretches and contracts in the left-right direction. When the absorbent article is viewed from the non-skin side, a waist coloring region that is colored in the left-right direction is provided in the waist elastic region.

[0076] According to method 12, the colored area at the waist is prominent, making it easy for users to notice the presence of the elastic area at the waist. Therefore, users can recognize that the absorbent product is a product that fits snugly against the wearer's waist, eliminating concerns about leakage and poor wearing comfort, and allowing them to use the absorbent product with confidence.

[0077] (Method 13) An absorbent article as described in any one of methods 1 to 12,

[0078] In the unfolded and extended state, the absorbent body having the absorbent core has side elastic regions on both sides in the left and right directions that extend and retract along the long side direction. When the absorbent article is viewed from the non-skin side or the skin side, a side coloring region that is colored along the long side direction is provided in the side elastic regions.

[0079] According to method 13, the side-colored area is prominent, making it easy for users to notice the presence of the side elastic area. Therefore, users can recognize that the absorbent material is a product that fits snugly around the wearer's leg area, eliminating concerns about leakage and poor comfort, and allowing them to use the absorbent material with confidence.

[0080] (Method 14) An absorbent article as described in Method 12,

[0081] In its unfolded and extended state, the absorbent body having the absorbent core has side elastic regions on both sides in the left and right directions that extend and retract along the long side direction. When the absorbent article is viewed from the non-skin side or the skin side, a side coloring region that is colored along the long side direction is provided in the side elastic regions. The specific color region in the crotch elastic region viewed from the non-skin side, the waist coloring region viewed from the non-skin side, and the side coloring region viewed from the non-skin side or the skin side are of the same color family.

[0082] According to method 14, the three elastic zones (crotch elastic zone, waist elastic zone, and side elastic zone) create a unified feel, making it easy for users to visually recognize the individual stretches and contractions of the absorbent material in the crotch, waist, and leg areas. Furthermore, the aesthetic appeal of the absorbent material is enhanced. Additionally, the use of three elastic zones in the same color family allows users to easily perceive the absorbent material's all-around fit (especially its excellent fit in areas prone to leakage), giving users peace of mind when using it.

[0083] (Method 15) An absorbent article as described in Method 12 or 14,

[0084] In its unfolded and extended state, the absorbent body having the absorbent core has lateral elastic regions on both sides in the left and right directions that extend and retract along the long side direction. When the absorbent article is viewed from the non-skin side or the skin side, a lateral coloring region colored along the long side direction is provided in the lateral elastic region. The maximum width in the left and right direction of the specific color region in the crotch elastic region is greater than the maximum width in the long side direction of the waist coloring region and the maximum width in the left and right direction of the lateral coloring region.

[0085] According to method 15, the elastic area under the crotch is the most prominent, making it easy for users to notice the presence of the elastic components. Therefore, users can recognize that absorbent items fit snugly against the wearer's crotch area, preventing sagging, and can use absorbent items with confidence.

[0086] (Method 16) An absorbent article having an absorbent core, having intersecting long side directions, left-right directions, and thickness directions in an unfolded and extended state, and having a crotch elastic region divided by a telescopic portion of a crotch elastic member, the crotch elastic member being disposed at a position closer to the non-skin side than the absorbent core and telescopic along the long side direction, at least a portion of the crotch elastic region being disposed in the crotch portion, which is the central region when the absorbent article is divided into three equal parts along the long side direction, and having a peripheral region surrounding the crotch elastic region, the peripheral region being an area ranging from a position half the width of the crotch elastic region to the right end of the crotch elastic region in the left-right direction. The range extending to the right from half the length of the original length, and in the long side direction, from the end of the elastic area in the crotch to the other side, extending away from the width of the original length of the elastic area in the crotch to the other side, when viewing the absorbent article from the non-skin side, includes a background color area and a specific color area different from the background color, wherein the background color area is the area with the largest area in the crotch, and the total length of the specific color area provided in one of the areas of the elastic area in the crotch and the peripheral area is more than half the length of the area of ​​that area, with respect to at least one of the long side direction and the left-right direction.

[0087] According to method 16, a specific color area is set in one of the wide areas in at least one of the directions of the long side and the left and right sides, making the elastic area under the crotch conspicuous. Therefore, before using the absorbent item, the user can easily notice the presence of the elastic part under the crotch and recognize that the absorbent item is a product that fits well with the wearer's crotch and is not prone to sagging.

[0088] [Implementation Method]

[0089] Hereinafter, as an example of an absorbent article according to an embodiment of the present invention, an adult underwear-type disposable diaper (hereinafter also referred to as "diaper 1") will be described. However, the absorbent article according to the present invention is not limited to the above-described case, and can also be used as a belt-type disposable diaper, sanitary underwear, etc. In addition, the wearer can also be an infant, animal, or other biological organism.

[0090] [First Implementation Method]

[0091] <Basic Structure of Underwear-Type Disposable Diapers 1>

[0092] Figure 1 This is a schematic front view of the underwear-type disposable diaper 1. Figure 2This is a rough top view of the diaper 1 in its unfolded and elongated state, viewed from the skin side. Figure 3 yes Figure 2 A rough cross-sectional view at the CC line. Figure 4 This is a schematic cross-sectional view of the absorbent body 10. Here, the "unfolded state" of the diaper 1 refers to the state in which the waist joint 2, described later, is untied and the diaper 1 is unfolded in a planar manner by opening the fold along its long side.

[0093] Diaper 1 Figure 1 In the shown underwear configuration, there are intersecting vertical, horizontal, and front-back directions, forming a waist opening (BH) and a pair of leg openings (LH). Additionally, in Figure 2 In the unfolded state shown, there are intersecting long side directions, left-right directions, and thickness directions. The long side direction is the vertical direction along the underwear-shaped state. The thickness direction is the direction in which the components constituting diaper 1 are stacked (see reference). Figure 4 In the vertical direction, the waist opening (BH side) is designated as the upper side, and the crotch side as the lower side. In the front-back direction, the side that is the wearer's abdomen is designated as the front side, and the side that is the wearer's back is designated as the back side. In the thickness direction, the side that is in contact with the wearer's body (skin) is designated as the skin side, and the opposite side is designated as the non-skin side.

[0094] In addition, the "stretched state" of diaper 1 refers to the state in which diaper 1 is stretched without wrinkles by stretching the various elastic components of diaper 1 (e.g., waist elastic components 24 and 25, leak-proof elastic components 51, etc., described later). Specifically, it refers to the state in which the dimensions of each base material constituting diaper 1 (e.g., top sheet 12, inner sheet 23, etc., described later) are stretched to the same size as or close to the size of its individual components.

[0095] In addition, diaper 1 Figure 3 As shown, the device includes an absorbent body 10 and an outer fitting 20 positioned further away from the skin than the absorbent body 10. The absorbent body 10 and the outer fitting 20 are joined together by an adhesive (not shown). Covering sheets 31 and 32 may also be provided at both ends of the absorbent body 10 from the skin side, covering the long side. This can prevent the edges of the absorbent body 10 from biting into the wearer and prevent the absorbent body 10 from opening.

[0096] In this instruction manual, such as Figure 2As shown, in the unfolded and stretched state of diaper 1, the ventral region when diaper 1 is divided into three equal parts along its long side is called "ventral side 1A", the central region is called "crotch region 1B", and the dorsal region is called "dorsal side 1C". The unfolded diaper 1 is folded in half at the central position CL along its long side, and the left and right sides of the outer fitting 20 of ventral side 1A and the outer fitting 20 of dorsal side 1C are joined together, thus forming... Figure 1 The diaper 1 is shown in an underwear-like state. Examples of joining methods for the waistband joint 2 include welding, adhesive-based joining, etc.

[0097] Absorbent subject 10 such Figure 4 As shown, the device includes an absorbent core 11 for absorbing excretory fluid, a liquid-permeable top sheet 12 (e.g., non-woven fabric) positioned on the skin side further in the thickness direction than the absorbent core 11, a liquid-impermeable back sheet 13 (e.g., a resin film of polyethylene, polypropylene, etc.) positioned on the non-skin side further in the thickness direction than the absorbent core 11, a pair of side sheets 16, and an elastic member cover sheet 17. The elastic member cover sheet 17 is a sheet-like component that covers the crotch elastic member 40 (described in detail later) that stretches along its long side from the non-skin side.

[0098] The absorbent core 11 is a component that absorbs and retains excretory fluids such as urine. The surface of the absorbent core 11 may also be covered by a liquid-permeable core wrapping sheet 18 (e.g., tissue paper). As the absorbent core 11, a component in which liquid-absorbing fibers such as pulp containing superabsorbent polymer (SAP) are formed into a predetermined shape can be exemplified. The absorbent core 11 of this embodiment has a shape that tapers inward from the central portion in the long side direction to the left and right directions, but the planar shape of the absorbent core 11 is not particularly limited.

[0099] A pair of leak-proof wall portions 50 are provided on both sides of the absorbent body 10 in the left-right direction, along the long side direction. For example... Figure 4 As shown, the side pieces 16 extending from the non-skin-side of the back piece 13 are bent at multiple points and positioned on the skin-side of the top piece 12, forming a leak-proof wall portion 50. A leak-proof wall elastic member 51 (e.g., a linear elastic member) is attached to the leak-proof wall portion 50 in a lengthwise extended state. Due to the elasticity of the leak-proof wall elastic member 51, the leak-proof wall portion 50 rises towards the wearer's skin, blocking excrement. A leg-circle elastic member 52 is provided along the lengthwise direction at a position further outward in the left-right direction than the leak-proof wall portion 50. Due to the elasticity of the leg-circle elastic member 52, the diaper 1 can conform to the wearer's leg circumference.

[0100] The outer component 20 is a sheet-like component that tapers inward from the center along its long side to the left and right sides. For example... Figure 3As shown, the outer component 20 has an abdominal outer layer 21, a back outer layer 22, an inner layer 23, waist elastic components 24 and 25, and a hip elastic component 26.

[0101] The outer ventral layer 21, the outer dorsal layer 22, and the inner layer 23 can be exemplified as soft sheet-like components such as non-woven fabric. The inner layer 23 forms the shape of the outer garment component 20 and is a sheet-like component that extends from the ventral side 1A through the crotch area 1B to the dorsal side 1C. The outer ventral layer 21 is positioned further away from the skin than the inner layer 23 and is located in a portion of the ventral side 1A. The outer ventral layer 21 overlaps with the waist joint 2 in the long side direction, and its length in the long side direction is the same as that of the waist joint 2. The outer dorsal layer 22 is positioned further away from the skin than the inner layer 23 and is located in a portion of the dorsal side 1C and the crotch area 1B. The outer dorsal layer 22 overlaps with the waist joint 2 in the long side direction and extends further towards the crotch than the waist joint 2. In the unfolded state of the diaper 1, the ventral outer layer 21 and the dorsal outer layer 22 are separated along their long sides, with the inner layer 23 exposed to the outside as the non-skin side of the diaper 1.

[0102] The waist elastic members 24 and 25 and the hip elastic member 26 are elastic members that stretch and contract in the left-right direction, and can be exemplified as linear elastic members. Figure 2 As shown, the waist elastic members 24 and 25 overlap with the waist joint 2 along their long sides. In the following description, the waist elastic member located on the ventral side 1A will also be referred to as the ventral waist elastic member 24, and the waist elastic member located on the dorsal side 1C will also be referred to as the dorsal waist elastic member 25. The hip elastic member 26 is located on the lower side (lower side in the vertical direction) further along the long side than the waist joint 2. In this embodiment, there are two hip elastic members 26, but this number is not particularly limited.

[0103] Furthermore, the waist elastic components 24 and 25 and the hip elastic component 26 are arranged vertically between the inner layer 23 and the abdominal outer layer 21 or the back outer layer 22 in the panty-like configuration, and are fixed in an extended state in the left-right direction. Therefore, the outer component 20 fits the wearer's waist and hips.

[0104] The basic structure of diaper 1 has been described above, but the structure of diaper 1 described above is an example and is not limited thereto. For example, a liquid-permeable intermediate sheet (e.g., non-woven fabric) may also be disposed between the top sheet 12 and the absorbent core 11. In addition, the outer garment component 20 of this embodiment is composed of a single component that runs continuously from the ventral side to the dorsal side in the long side direction, but is not limited thereto. For example, the ventral and dorsal outer garment components may be composed of different components, with the non-skin side of the absorbent body 10 exposed in the groin area, or a groin outer garment component may be provided between the ventral and dorsal outer garment components, which are different components, to connect them.

[0105] <Elastic components under the crotch 40>

[0106] Figure 5 This is a diagram illustrating the configuration of the elastic component 40 in the crotch area. Figure 6 and Figure 7 This is a diagram illustrating the configuration of a modified example of the elastic component 40 in the crotch area. Figures 5-7 This is a partial top view of diaper 1 in its unfolded and extended state.

[0107] The diaper 1 has a "crotch elastic member 40" that stretches along its long side and is located further away from the skin than the absorbent core 11. In this embodiment, the diaper 1 has multiple linear elastic members as the crotch elastic member 40. Figure 4 As shown, multiple groin elastic members 40 (five linear elastic members) are arranged at intervals in the left-right direction between the back panel 13 and the elastic member cover 17. Each groin elastic member 40 is installed in a state of elongation along its long side. Furthermore, as described later... Figure 9 and Figure 13B In the accompanying drawings other than those shown, only the telescopic portion of the crotch elastic member 40 is shown.

[0108] The area divided by the stretchable portion of the crotch elastic member 40 is called the "crotch elastic region ER". At least a portion of the crotch elastic region ER is provided in the "crotch portion 1B", which is the central area when the diaper 1 is divided into three equal parts along its long side in its unfolded and stretched state. The crotch elastic region ER can be concentrated within the crotch portion 1B. Figure 5 , Figure 6 It can also extend to the ventral part 1A ( Figure 7 It can also extend to the back side 1C. Furthermore, the in-groin elastic region ER can be configured to span the central CL along the long side of the diaper 1, or it can be configured to be more forward or backward than the central CL. Additionally, the multiple in-groin elastic members 40 of the diaper 1 can have the same or different lengths.

[0109] Specifically, the following describes the groin elastic region ER when multiple linear groin elastic components 40 are arranged at intervals in the left-right direction. For example... Figure 5 As shown, the groin elastic region ER is the area between the leftmost groin elastic member 40a and the rightmost groin elastic member 40b. The groin elastic region ER is defined by an imaginary line connecting the ventral ends of the telescopic portions of each groin elastic member 40 arranged in the left-right direction and an imaginary line connecting the dorsal ends of the telescopic portions of each groin elastic member 40 in the long side direction.

[0110] For example, such as Figure 5 As shown, when the five elastic components 40 in the groin area are of the same length, the elastic region ER in the groin area becomes rectangular. Figure 6 As shown, when the three central crotch elastic members 40 among the five crotch elastic members 40 are longer, the central part of the crotch elastic region ER in the left-right direction protrudes outward in the long side direction.

[0111] Furthermore, when the crotch elastic member 40 is a stretchable sheet (such as a stretchable nonwoven fabric or a stretchable film), the area where the stretchable sheet is disposed is designated as the crotch elastic region ER. When multiple strip-shaped stretchable sheets or flat rubbers are arranged at intervals in the left-right direction, the situation is the same as with linear elastic members. That is, the area between the left end of the leftmost crotch elastic member 40 (strip-shaped stretchable sheet or flat rubber) and the right end of the rightmost crotch elastic member 40 is designated as the crotch elastic region ER.

[0112] However, as Figure 7 As shown, the groin elastic components 40, which are arranged with a significant distance between them in the left-right direction, belong to different groin elastic regions ER. For example, the minimum distance between the multiple groin elastic regions 40 arranged in the left-right direction ( Figure 7 The elastic component 40 in the groin area, which is more than three times larger than Wa, belongs to a different elastic region ER in the groin area. Therefore, the elastic region ER in the groin area can be as follows: Figure 5 Setting it in the center of the absorbent core 11 in the left-right direction, it can also be like... Figure 7 Multiple such arrangements are placed with intervals spaced apart in the left-right direction (in this case, a pair). Figure 5 In the middle, when the absorbent core 11 is divided into three equal parts by its maximum width, the central region CR is provided with the crotch elastic region ER.

[0113] The crotch elastic member 40, which overlaps with the absorbent core 11 in the thickness direction, is integrally bonded to the absorbent core 11 via the backing sheet 13 using an adhesive or the like. Therefore, when the diaper 1 is worn, the crotch elastic member 40 contracts in the long side direction, and the absorbent core 11 easily deforms and is pushed upwards towards the skin to conform to the wearer's crotch area. Thus, the absorbent core 11 maintains a good close fit to the wearer's crotch area, making leakage of excrement difficult. Furthermore, it reduces discomfort during wear. Even after the absorbent core 11 absorbs excrement and increases in weight, it is less likely to sag, maintaining a close fit to the wearer's crotch area.

[0114] In particular, when the elastic area ER in the groin area is located at the central portion CR in the left-right direction of the absorbent core 11, the central portion CR in the left-right direction of the absorbent core 11 deforms into a convex shape upward (towards the wearer's groin area). Therefore, it is difficult for a gap to be formed between the wearer's excretory opening (e.g., the urethral opening) and the absorbent core 11, thus preventing urine and other excretory fluids from leaking along the wearer's skin to the outside of the diaper 1.

[0115] <Specific color area 60>

[0116] Figure 8 This is an explanatory diagram regarding a specific color region 60. Figure 9 This is an enlarged view of the elastic ergoid region (ER) and the surrounding area (AR) in the groin area. Figure 10A , Figure 10B , Figure 11A , Figure 11B as well as Figure 12 This is an explanatory diagram of a variation of a specific color region 60.

[0117] Diaper 1 has a peripheral area AR that surrounds the elastic area ER in the crotch area. Figures 5-7 In the diagram, the elastic groin area ER is filled with black dots, and diagonal lines are drawn around the surrounding area AR. The surrounding area AR extends from a position ARa (half the width Wa / 2 of the elastic groin area ER's width) to a position ERb (half the width Wa / 2 of the elastic groin area ER's width) to the right of the elastic groin area ER's right end. It also extends along its long side from a position ERc (ventral side) to a position ARd (rear side) to a position ERd (opposite side). The elastic groin area ER is not included in the surrounding area AR.

[0118] However, if the width Wa of the elastic region ER in the crotch area is relatively long, and the positions of the left and right ends ARa and ARb of the peripheral region AR in the left and right directions should extend beyond the left and right ends 10a and 10b of the absorbent body 10 and be located on the outside, then the left and right ends 10a and 10b of the absorbent body 10 should be taken as the left and right ends ARa and ARb of the peripheral region AR. Similarly, if the width Wa of the elastic region ER in the crotch area is relatively long, and the positions of the long side ends ARc and ARd of the peripheral region AR in the long side direction should extend beyond the long side ends 10c and 10d of the absorbent body 10 and be located on the outside, then the long side ends 10c and 10d of the absorbent body 10 should be taken as the long side ends ARc and ARc of the peripheral region AR. That is, the peripheral region AR converges to the area overlapping with the absorbent body 10 in the thickness direction.

[0119] As previously mentioned, through the crotch area 1B of diaper 1 ( Figure 8 The area surrounded by thick threads in the diaper 1 contains an elastic crotch area ER, ensuring a close fit to the wearer's crotch and preventing sagging after urination. However, there is a concern that users may not notice the presence of the elastic crotch area 40 if it is only located in the diaper 1. Therefore, as... Figure 1 , Figure 8 As shown, the diaper 1 is provided with a "specific color area 60" that can be visually confirmed when the diaper 1 is viewed from the non-skin side.

[0120] When viewed from the non-skin side, the diaper 1 has a background color area 61 and a specific color area 60 that is different from the background color. The background color area 61 is the area that occupies the largest area in the crotch portion 1B of the diaper 1 in its unfolded and stretched state. For example, if the substrate of the absorbent body 10 and the outer part 20 located in the crotch portion 1B is a white substrate, the background color is white, and the white area becomes the background color area 61. Furthermore, the area that is colored with a specific color different from white (e.g., blue, green, etc.) becomes the specific color area 60.

[0121] In the diaper 1 of this embodiment, a specific color is printed on the backing sheet 13, and the area colored with the specific color is visually confirmed from the non-skin side of the diaper 1 via the outer fitting 20, thus becoming the specific color area 60. Figure 8 and Figure 9 In the example shown, a strip-shaped (rectangular) specific color region 60 with a longer length direction is shown at the position where it overlaps with the linear crotch elastic member 40. Similar to the five crotch elastic members 40 arranged in the left-right direction, the five rectangular specific color regions 60 are arranged at intervals in the left-right direction.

[0122] Conversely, a large portion of the substrate located at the crotch 1B can also be colored, for example, green. In this case, the area colored green becomes the background color area 61. Furthermore, the area that is not colored as the background color (e.g., green), that is, the area where the base color of the substrate remains as is, and the area that is colored with a color different from the background color, becomes the specific color area 60.

[0123] Furthermore, the method for coloring the substrate to form the specific color area 60 and the background color area 61 is not particularly limited. For example, coloring can be achieved by printing on the substrate, or by including a colorant in the structural components (fibers, etc.) of the substrate. In this embodiment, the specific color area 60 is formed by printing on the back sheet 13, but it is not limited to this. The specific color area 60 and the background color area 61 can also be formed by coloring other substrates such as the elastic member cover sheet 17, the outer fitting 20, and the crotch elastic member 40.

[0124] Furthermore, when viewing the diaper 1 in its unfolded and stretched state from the non-skin side, the following is established: First, the ratio obtained by dividing the total area (A1) of the specific color areas 60 provided in the elastic crotch area ER by the area (S1) of the elastic crotch area ER is defined as the "first area ratio (A1 / S1)". The first area ratio is the area ratio of the specific color areas 60 in the elastic crotch area ER. On the other hand, the ratio obtained by dividing the total area (A2) of the specific color areas 60 provided in the peripheral area AR by the area (S2) of the peripheral area AR is defined as the "second area ratio (A2 / S2)". The second area ratio is the area ratio of the specific color areas 60 in the peripheral area AR.

[0125] At this point, in diaper 1, the absolute value of the difference between the first area ratio and the second area ratio is greater than the first area ratio, or greater than the second area ratio.

[0126] |A1 / S1-A2 / S2|≥A1 / S1, or,

[0127] |A1 / S1-A2 / S2|≥A2 / S2.

[0128] For example, in Figure 9 In the groin elastic area ER, three strip-shaped specific color areas 60 and two strip-shaped specific color areas 60 with a width of half are provided. In contrast, only two strip-shaped specific color areas 60 with a width of half are provided in the peripheral area AR. That is, in Figure 9In the diaper 1, the specific color area 60 in the elastic area ER is large, and its first area ratio is large. On the other hand, the specific color area 60 in the surrounding area AR is small, and its second area ratio is small. Therefore, the absolute value of the difference between the first area ratio (large) and the second area ratio (small) is large and greater than the second area ratio (small) (|A1 / S1-A2 / S2|≥A2 / S2). That is, the first area ratio is approximately more than twice the second area ratio. In this way, compared with the opposite case (where the absolute value of the difference is less than the second area ratio), the specific color area 60 set in the elastic area ER is more conspicuous. Therefore, when the user (wearer, caregiver, etc.) sees the diaper 1 in its natural state before use, they are more likely to focus on the elastic area ER and notice the stretching of the crotch area 1B (the presence of the elastic part 40) based on the wrinkles caused by the contraction of the elastic part 40.

[0129] Conversely, in the variant example Figure 10A In the diaper, a specific color area 60 in a hollow rectangular shape (thick frame) is provided in the peripheral area AR such that it surrounds the elastic crotch area ER. That is, the specific color area 60 in the peripheral area AR is large, and the second area ratio is large. On the other hand, the specific color area 60 is not provided in the elastic crotch area ER, and the first area ratio is small (zero in this case). Therefore, the absolute value of the difference between the first area ratio (small) and the second area ratio (large) is large and greater than the first area ratio (small) (|A1 / S1-A2 / S2|≥A1 / S1). That is, the second area ratio is approximately more than twice the first area ratio. In this way, compared with the opposite case (where the absolute value of the difference is less than the first area ratio), the specific color area 60 in the peripheral area AR is more conspicuous, and the elastic crotch area ER surrounded by the specific color area 60 is more conspicuous. Therefore, when a user sees the diaper 1 in its natural state before use, they are more likely to focus on the elastic crotch area ER, and based on the wrinkles caused by the contraction of the elastic crotch member 40, they are more likely to notice the stretching of the crotch area 1B (the presence of the elastic crotch member 40).

[0130] Users who notice the presence of the elastic part 40 under the crotch before using diaper 1 can recognize that diaper 1 fits snugly against the wearer's crotch area and that the absorbent core 11 is unlikely to sag. Therefore, users' concerns about whether the absorbent core 11 will sag are eliminated when pressure is applied to the inner thigh or when the weight increases due to excrement. This eliminates concerns about leakage and poor wearing comfort caused by diaper 1 sagging, allowing users to use diaper 1 with confidence. Furthermore, because the wearer is aware of the presence of the elastic part 40 under the crotch area, they can easily experience the snug fit of diaper 1 while wearing it, reducing concerns about leakage.

[0131] In addition, Figures 9-12In the example, a specific color region 60 is shown, but as long as the above area ratio relationship is satisfied, the shape, number, and arrangement of the specific color region 60 are not particularly limited.

[0132] More preferably, the absolute value of the difference between the first area ratio and the second area ratio is more than twice the first area ratio, or more than twice the second area ratio.

[0133] |A1 / S1-A2 / S2|≥2×A1 / S1, or,

[0134] |A1 / S1-A2 / S2|≥2×A2 / S2.

[0135] In this way, the difference in area ratio between the elastic crotch area ER and the surrounding area AR of the specific color region 60 becomes larger. Therefore, the elastic crotch area ER with the specific color region 60 becomes more conspicuous, and the elastic crotch area ER surrounded by the specific color region 60 becomes even more conspicuous. Thus, the user becomes more likely to notice the presence of the elastic crotch component 40.

[0136] Furthermore, the first and second area ratios can be measured using well-known methods. For example, by fixing the diaper 1 in its unfolded and stretched state with the non-skin side facing upwards, the ranges of the elastic crotch area ER, the peripheral area AR, and the specific color area 60 within the diaper 1 are determined. The area ratios are then calculated by actually measuring the lengths of the target areas (ER, AR, 60) and calculating their areas. Alternatively, the area ratios can be calculated by acquiring image data of the diaper 1 and using an area calculation program to obtain the areas of the target areas (ER, AR, 60).

[0137] In addition, the difference between the background color and the specific color refers to the degree to which multiple subjects (e.g., 10 people) can recognize the difference in color through visual confirmation.

[0138] Specifically, when one of the specific color and the background color is white and the other is a color other than white, they are considered to be different colors. Preferably, one of the specific color and the background color is white as defined below, and the other is a color not included in white as defined below. White, for example, includes colors whose color difference from pure white is less than 12, in addition to colors represented as "N9.5" in the Munsell color system and colors represented as "255, 255, 255" in the RGB color space (so-called pure white). Regarding the measurement of the color difference of white, for example, a Konica Minolta CR-300 or equivalent instrument can be used as a color difference meter, and a C light source (International Commission on Illumination (CIE) specification) can be used as the light source of the measuring instrument. In this case, the diameter of the measuring window of the measuring instrument is 40 mm. The color difference is ΔL, Δa, and Δb relative to the (L*a*b*) color space of the white reference plate. The color difference relative to the white reference plate can be calculated by separately measuring the Lab values ​​of the white reference plate and the target area (measured with the unfolded and stretched diaper 1 facing upwards, with the non-skin side up). The white reference plate is set to (X93.19, Y95.20, Z112.28) and is set to Lab0. Here, L is the value indicating luminance, and a and b are the chromaticity coordinates. If the Lab values ​​of the white reference plate are set to L0, a0, b0, and the Lab values ​​of the target area are set to L1, a1, b1, the color difference can be calculated using ΔL = L0 - L1, Δa = a0 - a1, and Δb = b0 - b1.

[0139] Furthermore, both the specific color and the background color can be colors other than white. In this case, even colors from the same system (e.g., the blue system) are considered different if they are colors with different brightness (e.g., blue and light blue) and multiple subjects can visually recognize the difference. Preferably, a Munsell color wheel divided into 20 hues can be used for judgment. First, multiple subjects (e.g., 10 people) observe the unfolded and stretched diaper 1 from the non-skin side and determine which hue of the Munsell color wheel the target area (specific color area 60 and background color area 61) corresponds to (the closest hue). The hue chosen by the most people is taken as the hue of that target area. If the hue of the specific color area 60 and the hue of the background color area 61 are more than two hues apart (in cases where they are not the same hue or adjacent hues), they are considered different colors.

[0140] Alternatively, when the diaper 1 is unfolded and stretched, a specific color region 60 may be provided in at least one of the elastic area ER in the crotch area and the surrounding area AR, with a length in the long side direction longer than the length in the left-right direction. For example, in Figure 9In the elastic region ER below the crotch, multiple rectangular, specifically colored regions 60, whose length L1 in the long side direction is longer than their length L2 in the left-right direction, are arranged in the left-right direction. Additionally, in the modified example... Figure 10A In the surrounding AR area, a specific color region 60 is set with a hollow rectangular shape (thick frame) whose length L4 in the long side direction is longer than the length L5 in the left and right directions.

[0141] As such, the specific color area 60 (the pattern formed by the specific color) is longer in the long direction, and users who see this pattern are more likely to be impressed by the stretching and contraction of the crotch elastic component 40 in the long direction. Therefore, users are more likely to recognize that the crotch elastic component 40 maintains a state of pushing the absorbent core 11 upwards and towards the skin, and that the diaper 1 is a product that fits the wearer's crotch well and is less likely to sag.

[0142] Furthermore, preferably, such as Figure 9 As shown, in the unfolded and stretched state of the diaper 1, multiple strip-shaped, color-specific areas 60 are arranged in the left-right direction along the long side of the elastic area ER in the crotch region. By doing so, the width L2 of the strip-shaped, color-specific areas 60 becomes smaller, making the color-specific areas 60 elongated. Users who see this area are more likely to perceive the stretching and contraction of the elastic component 40 in the long side direction. Therefore, users are more likely to perceive the diaper 1 as a product that fits snugly against the wearer's crotch and is less prone to sagging.

[0143] However, it is not limited to the above. For example, Figure 10B As shown in the variation, the entire area of ​​the groin elastic region ER can also be a specific color region 60. Alternatively, the groin elastic region ER can have only one specific color region 60, which is a long rectangle along its long side.

[0144] Furthermore, preferably, in the unfolded and stretched state of the diaper 1, the total length of the specific color region 60 provided in one of the regions of the crotch elastic region ER and the surrounding region AR is more than half the length of said region, with respect to at least one of the long side direction and the left and right direction.

[0145] For example, in Figure 9 In this configuration, the length L1 of the long side of the specific color region 60 located in the elastic crotch area ER is the same as the length L1 of the long side of the elastic crotch area ER, and is more than half the length of the long side of the elastic crotch area ER. In this case, the specific color region 60 is provided over a wide area along the long side of the elastic crotch area ER. Therefore, the user can easily focus on the elastic crotch area ER.

[0146] Furthermore, in Figure 9In this design, the total length of the specific color areas 60 located in the groin elastic area ER in the left and right directions (specifically, the sum of the lengths of the three strip-shaped specific color areas 60 (L2×3) and the lengths of the two half-width specific color areas 60 (L2 / 2×2)) is more than half the length L3 of the specific color areas 60 in the left and right directions. Therefore, the specific color areas 60 are provided over a wide range in the left and right directions of the groin elastic area ER. As a result, the user can easily focus on the groin elastic area ER.

[0147] By satisfying the aforementioned length relationship regarding both the long side direction and the left-right direction, the user can easily focus on the elastic area ER in the groin. Therefore, the presence of the elastic member 40 in the groin becomes more readily apparent. Furthermore, the user can grasp more than half of the range of the actual stretching / retracting position of the elastic member 40. However, this is not a limitation; the aforementioned length relationship may only need to be satisfied regarding one of the directions—the long side direction and the left-right direction.

[0148] In addition, Figure 10A In this design, the length L4 of the specific color area 60 located in the peripheral area AR is more than half the length L6 of the peripheral area AR (L4 ≥ L6 / 2). Furthermore, the length L5 of the specific color area 60 in the left-right direction is more than half the length L7 of the peripheral area AR (L5 ≥ L7 / 2). Therefore, with the specific color area 60 located over a wide area in both the long and left-right directions of the peripheral area AR, users can easily focus on the elastic area ER in the crotch area.

[0149] Furthermore, the specific color region 60 is not limited to a long, continuous area along the longitudinal and lateral directions. Alternatively, multiple smaller specific color regions 60 can be arranged along the longitudinal and lateral directions. For example, in... Figure 12 In the groin elastic area ER, circular, color-specific regions 60 are arranged in a staggered pattern, spaced apart along the long side and in the left-right direction. In this case, if the aforementioned area ratio relationship is also satisfied, the groin elastic area ER becomes prominent, and the user can easily notice the presence of the groin elastic component 40.

[0150] In addition, as in Figure 12 In that case, the region spanning the entire left-right or long-side direction of the elastic crotch area ER, where the specific color region 60 is not located, is designated as the non-specific color region 62. Furthermore, the total length of the regions in one of the elastic crotch area ER and the surrounding area AR, excluding the non-specific color region 62, is taken as the total length of the specific color region 60 located in that region. For example, regarding... Figure 12The length obtained by subtracting the total length of n non-specific color regions 62 (L8×n) from the length L1 of the elastic region ER in the crotch direction is the total length of the specific color regions 60 disposed in the elastic region ER in the crotch direction. That is, it is the total length of the multiple specific color regions 60 arranged in an alternating pattern in the long direction. Preferably, this total length is more than half of the length L1 of the elastic region ER in the crotch direction.

[0151] Furthermore, preferably, the first area ratio is 1 / 2 or more, or the second area ratio is 1 / 2 or more. Since the first area ratio is 1 / 2 or more, more than half of the groin elastic area ER becomes the specific color area 60. Therefore, compared to the case where the first area ratio is less than 1 / 2, the groin elastic area ER is more prominent, making it easier for the user to focus on the groin elastic area ER and notice the presence of the groin elastic component 40. Similarly, since the second area ratio is 1 / 2 or more, more than half of the surrounding area AR becomes the specific color area 60. Therefore, compared to the case where the second area ratio is less than 1 / 2, the wider groin elastic area ER is surrounded by the specific color area 60, making it easier for the user to focus on the groin elastic area ER and notice the presence of the groin elastic component 40.

[0152] However, this is not limited to the above; the first or second area ratio can also be less than 1 / 2. For example, in... Figure 11A In the case where the area of ​​the specific color region 60 set in the surrounding AR region is small, the second area ratio is less than 1 / 2. In this situation, when the first area ratio is small (due to...), Figure 11A The first area ratio is zero, which also satisfies the aforementioned area ratio relationship (|A1 / S1-A2 / S2|≥A1 / S1). Based on the specific color area 60, users can easily focus on the elastic area ER in the crotch area. In addition, Figure 11A In the middle, a specific colored area 60 in the shape of a bracket is provided further outward than the four corners of the groin elastic area ER to indicate the position of the corners of the groin elastic area ER. Therefore, even if the second area ratio is less than 1 / 2, the position of the groin elastic area ER is indicated, making it easy for the user to focus on the groin elastic area ER.

[0153] Alternatively, it could be like... Figure 11B Therefore, the specific color area 60 set in the elastic area ER under the crotch is a thin line-shaped frame, and the first area ratio is less than 1 / 2. In this case, when the second area ratio is small (due to... Figure 11B The second area ratio is zero, which also satisfies the aforementioned area ratio relationship (|A1 / S1-A2 / S2|≥A2 / S2). Figure 11B The specific colored area 60 is a frame shape that is roughly similar in shape to the outline of the groin elastic area ER. Therefore, even though the first area ratio is less than 1 / 2, the position of the groin elastic area ER is represented, making it easy for the user to focus on the groin elastic area ER.

[0154] In addition, Figure 12 In a modified example, a specific color area 60 is provided in the elastic area ER in the crotch, but no specific color area 60 is provided in the surrounding area AR. In this case, since the user can easily focus directly on the elastic area ER in the crotch, the presence of the elastic component 40 in the crotch is easily noticed based on the wrinkles caused by the contraction of the elastic component 40.

[0155] Furthermore, in the groin elastic region ER, where multiple linear groin elastic components 40 are arranged in the left-right direction, preferably, as shown below... Figure 9 , Figure 10B , Figure 12 As shown, in the unfolded and stretched state of the diaper 1, the stretchable portion 40E of the crotch elastic member 40 has a portion that overlaps with the specific color area 60 in the thickness direction. By doing so, the user can easily focus directly on the stretchable portion 40E of the crotch elastic member 40, and the presence of the crotch elastic member 40 is easily noticed based on the wrinkles created by its contraction. The wrinkles are particularly noticeable when the specific color is a color other than white. Furthermore, when the specific color area 60 and the crotch elastic member 40 are different colors, the visual certainty of the crotch elastic member 40 is enhanced. Therefore, the user can more easily notice the presence of the crotch elastic member 40.

[0156] It is permissible that only a portion of the telescopic portion 40E of the crotch elastic member 40 overlaps with the specific color area 60, but preferably, a large portion of the telescopic portion 40E of the crotch elastic member 40 overlaps with the specific color area 60 in the thickness direction. By doing so, the user can grasp the actual position of the telescopic portion 40 of the crotch elastic member 40.

[0157] In addition, Figure 9 In the same way as the five elastic crotch components 40 arranged in the left-right direction, five strip-shaped specific color areas 60 are also arranged in the left-right direction. Therefore, users who see the specific color areas 60 can easily and intuitively recognize that there are multiple linear elastic crotch components 40 arranged in the left-right direction.

[0158] Alternatively, in the unfolded and stretched state of the diaper 1, in a region further outward along the long side than the crotch elastic region ER, the non-stretchable portion 40N of the crotch elastic member 40 may have a portion that does not overlap with the specific color region 60 in the thickness direction. It is permissible for only a portion of the non-stretchable portion 40N of the crotch elastic member 40 to not overlap with the specific color region 60, but it is preferable as follows: Figure 9 As shown, the entire non-stretchable portion 40N of the crotch elastic component 40 does not overlap with the specific color area 60.

[0159] Based on the above, it is possible to prevent users from mistakenly perceiving the non-stretchable portion 40N of the crotch elastic member 40, which overlaps with the specific color area 60, as stretchable, and to accurately grasp the actual stretching position. Furthermore, in the manufacturing process of diaper 1, the non-stretchable portion 40N of the crotch elastic member 40 is formed by cutting off the portion of the crotch elastic member 40 that is not fixed to the substrate. Therefore, the non-stretchable portion 40N of the crotch elastic member 40 is not fixed to the substrate, allowing it to contract freely and bend easily. Because the non-stretchable portion 40N of the crotch elastic member 40 does not overlap with the specific color area 60, and is not along the long side direction, it becomes less conspicuous. Therefore, it is possible to suppress the diminished impression of the crotch elastic member 40 that stretches along the long side direction. Additionally, it is also possible to suppress the reduction of the appearance (aesthetics) of diaper 1.

[0160] Figure 13A It is a part of the cross-sectional view of the absorbent body 10. Figure 13B This is an explanatory diagram of the joint 70 between the back sheet 13 and the elastic member cover sheet 17. As described above... Figure 4 As shown, the absorbent body 10 has a liquid-impermeable back sheet 13 disposed on the non-skin side of the absorbent core 11 and an elastic member cover sheet 17 (non-skin side sheet) disposed on the non-skin side of the back sheet 13. A crotch elastic member 40 is disposed between the back sheet and the elastic member cover sheet 17. Furthermore, in the diaper 1 of this embodiment, the back sheet 13 is colored to form a specific color area 60. In this case, preferably, as shown... Figure 13A as well as Figure 13B As shown, in the unfolded and stretched state of the diaper 1, a joint 70 is provided between the back sheet 13 and the elastic member cover sheet 17 between a plurality of linear elastic members 40 arranged in the left-right direction. Furthermore, the joining method of the joint 70 is not particularly limited, and examples such as joining methods using adhesives can be shown.

[0161] In the section where the linear groin elastic member 40 is configured, the back sheet 13 and the elastic member cover sheet 17 are joined via the groin elastic member 40. However, if the joint portion 70 were not provided between the groin elastic members 40, the elastic member cover sheet 17 would easily float relative to the back sheet 13. Therefore, by providing the joint portion 70, the floating of the elastic member cover sheet 17 relative to the back sheet 13 can be suppressed, thus improving the visual visibility of the specific color area 60 on the back sheet 13. As a result, the groin elastic area ER is more prominent, and the user can easily recognize the presence of the groin elastic member 40.

[0162] Figure 13BThe joint 70 illustrated herein is continuous along its long side across the entire area of ​​the groin elastic region ER, but the pattern of the joint 70 is not particularly limited. For example, the joint 70 may be discontinuous along its long side, or it may be provided only in a portion of the groin elastic region ER along its long side. Furthermore, when three or more groin elastic members 40 are arranged, it is sufficient to provide a joint 70 between at least one of the groin elastic members 40 arranged in the left-right direction.

[0163] Additionally, preferably, such as Figure 13B As shown, the joint 70, which joins the back piece 13 and the elastic member cover piece 17 between a plurality of groin elastic members 40 arranged in the left-right direction, extends to a position further outward in the long side direction than the groin elastic region ER.

[0164] As previously described, the non-stretchable portion 40N of the crotch elastic member 40 is not fixed to the substrate, allowing it to contract freely and thus bend easily. Therefore, by providing the joint 70 as described above, the lateral bending of the non-stretchable portion 40N of the crotch elastic member 40 is restricted by the joint 70. Specifically, as... Figure 13B As shown, by providing joints 70 on both sides of the non-stretchable portion 40N of the crotch elastic member 40 in the left-right direction, the non-stretchable portion 40N of the crotch elastic member 40 is concentrated between the joints 70 arranged in the left-right direction, suppressing large bending. Therefore, it is possible to suppress the reduction of the impression of the crotch elastic member 40 stretching in the long side direction. In addition, it is also possible to suppress the reduction of the appearance (aesthetics) of the diaper 1.

[0165] In this embodiment, a specific color area 60 is formed by printing color on the backing sheet 13, but it is not limited to this. The specific color area 60 can also be formed by coloring the crotch elastic member 40. That is, by coloring the crotch elastic member 40 with a color different from the background color, the area where the crotch elastic member 40 is disposed becomes the specific color area 60 when the diaper 1 is viewed from the non-skin side.

[0166] In this situation, the user can easily focus directly on the crotch elastic component 40, and thus easily notice its presence based on the wrinkles created by its contraction. Furthermore, the user can accurately grasp the actual position of the stretching. Especially when the crotch elastic component 40 is a sheet-like elastic component, or when multiple strip-like elastic components are arranged in the left-right direction, the first area ratio increases (the area of ​​the specific color region 60 in the crotch elastic region ER increases), making it easier to satisfy the aforementioned area ratio relationship.

[0167] like Figure 2As shown, the diaper 1 has a waist elastic region WR that stretches in the left-right direction at at least one end along its long side, specifically the two ends on the ventral and back sides. Furthermore, the waist elastic regions WR have a smaller interval along their long sides compared to areas closer to the groin. Preferably, when viewing the diaper 1 in its unfolded and elongated state from a non-skin side, a waist coloring region 25c that is colored in the left-right direction is provided in the waist elastic region WR. That is, the waist coloring region 25c is colored a different color from the surrounding areas (e.g., background color area 61), and is visually recognized as a different color from the surrounding areas when viewing the diaper 1 from a non-skin side. The definition of the different color is the same as that for the specific color area 60 and the background color area 61. In the diaper 1 of this embodiment, as... Figure 8 As shown, a waist coloring region 25c is formed by coloring the waist elastic member 25 (the third to eighth waist elastic member 25 from the waist side) which is part of the waist elastic region WR on the back side.

[0168] Based on the above, since the colored area 25c at the waist is prominent, users are more likely to focus on the elastic area WR at the waist and notice the waist stretch (the presence of the elastic waist component 25). Therefore, before using diaper 1, users can recognize that diaper 1 is a product that fits the wearer's waist well, eliminating concerns about leakage from gaps and poor wearing comfort, and can use diaper 1 with confidence.

[0169] In diaper 1, a waist coloring area 25c is provided only in the elastic waist area WR on the back side. Therefore, the front and back of diaper 1 can be determined based on the waist coloring area 25c. However, it is not limited to the above; the waist coloring area may be provided only in the elastic waist area WR on the abdomen side, or the waist coloring area may be provided in the elastic waist areas WR on both the back and abdomen sides.

[0170] In addition, such as Figure 2 as well as Figure 4As shown, the diaper 1 has lateral elastic regions SR that stretch along the long side on both sides of the absorbent body 10 in the left-right direction. The diaper 1 of this embodiment has lateral elastic regions SR defined by the stretching portion of a leak-proof wall elastic member 51 located closer to the skin than the top sheet 12 and which raises the leak-proof wall portion 50 towards the skin, and lateral elastic regions SR defined by the stretching portion of a leg cuff elastic member 52 located further outward in the left-right direction than the leak-proof wall elastic member 51. Furthermore, when viewing the diaper 1 in its unfolded and extended state from either the non-skin side or the skin side, it is preferable to provide lateral colored regions 51c that are colored along the long side in the lateral elastic regions SR. That is, the lateral colored regions 51c are colored in a different color than the surrounding areas (e.g., the background color area 61 or the skin side of the absorbent body 10), and are visually recognized as different in color from the surrounding areas when the diaper 1 is viewed from either the non-skin side or the skin side. The definition of the different color is the same as that of the specific color area 60 and the background color area 61. In the diaper 1 of this embodiment, as Figure 4 As shown, a side-colored area 51c is formed by coloring a portion of the leak-proof wall elastic member 51 (the first and second leak-proof wall elastic members 51 counting from the inside in the left-right direction).

[0171] Based on the above, since the side-colored area 51c is prominent, users are more likely to focus on the side elastic area SR and notice the stretching of the leg opening (the presence of the leak-proof elastic component 51, etc.). Therefore, before using the diaper 1, users can recognize that the diaper 1 is a product that fits well to the wearer's leg opening, eliminating concerns about leakage from gaps and poor wearing comfort, and can use the diaper 1 with confidence.

[0172] However, it is not limited to the above. The side coloring area can also be formed by coloring the leg elastic member 52, or by coloring both the leak-proof wall elastic member 51 and the leg elastic member 52.

[0173] Furthermore, the elastic region WR and the side elastic region SR can be formed using sheet-like or strip-like elastic components, rather than just linear elastic components. Additionally, the coloring of elastic components such as the waist elastic component 25 and the leak-proof wall elastic component 51 can also be achieved by coloring a substrate (e.g., outer component 20, side panel 16, etc.) that overlaps with the elastic component in the thickness direction, thereby forming the waist colored region and the side colored region.

[0174] Furthermore, preferably, the specific color area 60 in the crotch elastic area ER viewed from the non-skin side of the diaper 1, the waist coloring area 25c viewed from the non-skin side of the diaper 1, and the side coloring area 51c viewed from either the non-skin side or the skin side of the diaper 1 are of the same color family. In addition, the side coloring area 51c provided in the side elastic area SR of the leak-proof wall portion 50 has higher visual confirmability from the skin side than from the non-skin side of the diaper 1.

[0175] By using color-coordinated areas in the same color family across the three elastic zones of Diaper 1 (the groin elastic zone ER, the waist elastic zone WR, and the side elastic zone SR), a sense of unity is created across the three elastic zones. Therefore, users can easily recognize the three elastic zones and visually perceive the individual stretches of the groin, waist, and leg openings of Diaper 1. Furthermore, the use of color-coordinated areas in the three elastic zones ensures a good all-around fit (especially in areas prone to leakage), allowing users to use Diaper 1 with confidence. Additionally, the appearance (aesthetics) of Diaper 1 is also enhanced.

[0176] Furthermore, if the three elastic regions (ER, WR, SR) are included in the aforementioned definition of white, then the three elastic regions can be considered to be homologous colors of white. Additionally, if the three elastic regions are colored other than white, homologous colors can be determined using a Munsell color wheel divided by 20 hues. First, multiple subjects (e.g., 10 people) observe the unfolded and stretched diaper 1 from either the non-skin side or the skin side, and each subject determines which hue on the Munsell color wheel corresponds to the target region (ER, WR, SR) (the closest hue). The hue chosen by the most subjects is taken as the hue of that target region. If the hues of the three elastic regions (ER, WR, SR) are the same, or are adjacent hues, they are considered homologous colors.

[0177] Furthermore, preferably, in the unfolded and stretched state of the diaper 1, the maximum width L2 of the specific color area 60 in the groin elastic area ER in the left-right direction (refer to...) Figure 9 The maximum width along the long side of the colored area 25c at the waist (the diameter of the colored elastic waist part 25, refer to...) Figure 8 ) and the maximum width in the left and right directions of the side-colored area 51c (the diameter of the colored leak-proof wall elastic component 51, refer to Figure 4 )big.

[0178] By doing so, the groin elastic area ER is the most prominent among the three elastic areas, making it easier for users to focus on it and notice the presence of the groin elastic component 40. Therefore, before using diaper 1, users can recognize that diaper 1 is a product that fits snugly to the groin area and is unlikely to sag, allowing them to use diaper 1 with confidence.

[0179] Preferably, in the unfolded and stretched state of the diaper 1, the length L11 of the specific color area 60 set in the elastic area ER under the crotch and the surrounding area AR from left to right (refer to...) Figure 9 ), which is longer than the length L12 from one end to the other in the long side direction of the waist colored area 25c set in the waist elastic area WR (refer to Figure 8 The length of the side elastic region 51c (located in the side elastic region SR) is longer than the length L13 from the left to the right end. In this case, the crotch elastic region ER is the most prominent among the three elastic regions, and the user can easily notice the presence of the crotch elastic component 40.

[0180] [Second Implementation]

[0181] Figure 14 This is an explanatory diagram of a specific color area 60 in the diaper 1 according to the second embodiment. The differences between the second embodiment and the first embodiment will be mainly explained in the second embodiment. Similar to the diaper 1 of the first embodiment, the diaper 1 of the second embodiment has at least a portion of an elastic crotch area ER provided in the crotch portion 1B, which is the central region when the diaper 1 is divided into three equal parts along its long side. Figures 5-7 For example, there is a peripheral area AR that surrounds the elastic area ER in the crotch area. Furthermore, when viewing the diaper 1 of the second embodiment from the non-skin side, the diaper 1 has a background color area 61 and a specific color area 60 that is different from the background color. The background color area 61 is the area that occupies the largest area in the crotch area 1B of the diaper 1.

[0182] Furthermore, in the diaper 1 of the second embodiment, in the unfolded and stretched state of the diaper 1, the total length of the specific color area 60 provided in one of the regions of the crotch elastic region ER and the peripheral region AR in at least one of the long side direction and the left and right direction is more than half the length of the region of said one.

[0183] For example in Figure 14In this embodiment, a thin, frame-shaped specific color region 60, following the outline of the elastic region ER in the crotch area, is arranged slightly offset from the elastic region ER. In this case, specific color regions 60 of the same area are provided in both the elastic region ER and the surrounding area AR. Therefore, the area ratio relationship of the first embodiment (|A1 / S1-A2 / S2|≥A1 / S1, or |A1 / S1-A2 / S2|≥A2 / S2) may not be satisfied. However, the length L9 of the specific color region 60 in the long side direction of the elastic region ER is more than half the length L1 of the elastic region ER in the long side direction (L9≥L1 / 2). Furthermore, the length L10 of the specific color region 60 in the left-right direction of the elastic region ER is more than half the length L3 of the elastic region ER in the left-right direction (L10≥L3 / 2).

[0184] In this way, by providing a specific color area 60 over a wide range in the crotch elastic area ER along both the long side and the left and right directions, the user can easily focus on the crotch elastic area ER. Therefore, based on the wrinkles created by the contraction of the crotch elastic component 40, the user can easily notice the presence of the crotch elastic component 40. Thus, from before using the diaper 1, the user can recognize that the diaper 1 is a product that fits snugly against the wearer's crotch and is unlikely to sag, allowing for confident use of the diaper 1. Furthermore, although not shown, one of the areas can also be the peripheral area AR; the same effect can be achieved by providing a specific color area 60 over a wide range in at least one of the directions, the long side and the left and right directions, in the peripheral area AR.

[0185] Alternatively, a specific color area 60 can be formed by coloring the linear crotch elastic member 40. In this case, since the linear crotch elastic member 40 is thin, the area of ​​the specific color area 60 provided in the crotch elastic region ER becomes smaller. Furthermore, if the non-stretchable portion 40N of the crotch elastic member 40 located in the peripheral region AR is also colored, the difference between the first area ratio and the second area ratio will become smaller. Therefore, the area ratio relationship of the first embodiment may sometimes not be satisfied. However, the length of the long side of the colored linear crotch elastic member 40, i.e., the length of the long side of the specific color area 60, becomes more than half the length of the long side of the crotch elastic region ER. Therefore, it becomes easier for the user to focus on the crotch elastic region ER and to notice the presence of the crotch elastic member 40.

[0186] [other]

[0187] The above embodiments are provided for ease of understanding of the present invention and are not intended to limit or explain the scope of the invention. It is self-evident that the present invention can be modified and improved without departing from its spirit, and that it includes equivalents.

[0188] Symbol Explanation

[0189] 1. Underwear-style disposable diapers (absorbent items).

[0190] 2. Waist joint,

[0191] 10 Absorbent Subjects

[0192] 11 Absorbent core,

[0193] 12 top films,

[0194] 13 Back film,

[0195] 16 side panels,

[0196] 17. Elastic component cover sheet (non-skin side sheet).

[0197] 20 External components,

[0198] 21. Ventral outer layer slice,

[0199] 22. Dorsal outer layer,

[0200] 23 Inner layer sheets,

[0201] 24 (Abdominal side) Waist elastic component

[0202] 25 (Back side) Elastic waistband components,

[0203] 26. Elastic components for the buttocks.

[0204] 31 Cover sheet,

[0205] 32 cover sheets,

[0206] 40. Elastic components in the crotch area.

[0207] 50 Leak-proof wall section,

[0208] 51 Leak-proof wall elastic component (side elastic component).

[0209] 52. Leg circumference elastic components.

[0210] 60 specific color areas

[0211] 61 background color area,

[0212] 70 Joint,

[0213] ER (erectile groin area)

[0214] AR surrounding area.

Claims

1. An absorbent article having an absorbent core, characterized in that, In the unfolded and elongated state It has intersecting long sides, left and right directions, and thickness direction. It has an elastic region in the groin area defined by a telescopic portion of an elastic component, which is positioned further away from the skin than the absorbent core and extends and retracts along the long side. At least a portion of the elastic crotch area is provided in the lower crotch region, which is the central region when the absorbent article is divided into three equal parts along its long side. It has a peripheral area surrounding the elastic area in the groin. The surrounding area is defined as follows: in the left-right direction, it extends from a position half the width of the elastic crotch area to the left of the left end of the elastic crotch area, and from a position half the width of the elastic crotch area to the right of the right end of the elastic crotch area; and in the long-side direction, it extends from a position half the width of the elastic crotch area to the position half the width of the elastic crotch area to the other end of the elastic crotch area. When viewing the absorbent article from the non-skin side... An area having a background color, and an area of ​​a specific color that is different from the background color. The background color area is the area that occupies the largest area in the lower crotch region. The ratio obtained by dividing the total area of ​​the specific color regions located in the elastic area under the crotch by the area of ​​the elastic area under the crotch is used as the first area ratio. When the total area of ​​the specific color regions set in the surrounding area is divided by the area of ​​the surrounding area, the ratio obtained is used as the second area ratio. The absolute value of the difference between the first area ratio and the second area ratio is greater than or greater than the first area ratio.

2. The absorbent article as claimed in claim 1, characterized in that, In the extended and stretched state, a region of a specific color is provided in at least one of the elastic region under the crotch and the surrounding region, where the length of the long side is longer than the length of the left and right sides.

3. The absorbent article as claimed in claim 2, characterized in that, In the extended and stretched state, in the elastic region under the crotch, multiple strip-shaped areas of the specific color are arranged in the left-right direction along the long side.

4. The absorbent article as described in any one of claims 1 to 3, characterized in that, In the unfolded and extended state, with respect to at least one of the long side direction and the left and right directions, the total length of the specific color region disposed in one of the regions of the crotch elastic region and the peripheral region is more than half the length of the region of that one side.

5. The absorbent article as described in any one of claims 1 to 3, characterized in that, The first area ratio is 1 / 2 or more, or the second area ratio is 1 / 2 or more.

6. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, There are no areas in the surrounding area that have the specific color set.

7. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, In the extended and stretched state, in the groin elastic region, multiple linear groin elastic components are arranged in the left-right direction, and the telescopic portion of the groin elastic component has a portion that overlaps with the region of the specific color in the thickness direction.

8. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, In the unfolded and elongated state In the elastic region below the groin, multiple linear elastic components are arranged in the left-right direction. In the region further outward along the long side than the groin elastic region, the non-stretchable portion of the groin elastic member has a portion that does not overlap with the region of the specific color in the thickness direction.

9. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, A liquid-impermeable back sheet and a non-skin side sheet positioned further away from the non-skin side than the back sheet. The elastic crotch component is disposed between the back panel and the non-skin side panel. The back sheet is colored to form areas with the specific color. In the unfolded and elongated state In the elastic region below the groin, multiple linear elastic components are arranged in the left-right direction. A joint between the back piece and the non-skin side piece is provided between the plurality of elastic groin components arranged in the left-right direction.

10. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, A liquid-impermeable back sheet and a non-skin side sheet positioned further away from the non-skin side than the back sheet. The elastic crotch component is disposed between the back panel and the non-skin side panel. In the unfolded and elongated state In the elastic region below the groin, multiple linear elastic components are arranged in the left-right direction. A joint between the back piece and the non-skin side piece is provided between the plurality of elastic crotch components arranged in the left-right direction. The joint extends to a position further outward along the long side than the elastic area in the groin.

11. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, The area with the specific color is formed by coloring the elastic component in the crotch.

12. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, In the unfolded and elongated state The end of at least one side in the long side direction has a waist elastic region that can stretch and contract in the left-right direction. When viewing the absorbent article from the non-skin side, a waist-colored area is provided in the elastic area of ​​the waist, which is colored in the left-right direction.

13. The absorbent article as claimed in any one of claims 1 to 3, characterized in that, In the unfolded and elongated state The absorbent body having the absorbent core has lateral elastic regions on both sides in the left-right direction that can stretch and extend along the long side direction. When the absorbent article is viewed from the non-skin side or the skin side, a side-colored area that is colored along the long side direction is provided in the side elastic area.

14. The absorbent article as claimed in claim 12, characterized in that, In the unfolded and elongated state The absorbent body having the absorbent core has lateral elastic regions on both sides in the left-right direction that can stretch and extend along the long side direction. When viewing the absorbent article from either the non-skin side or the skin side, a side-colored area that is colored along the long side direction is provided in the side elastic region. The specific color area in the groin elastic area viewed from the non-skin side, the waist coloring area viewed from the non-skin side, and the side coloring area viewed from either the non-skin side or the skin side are of the same color family.

15. The absorbent article as claimed in claim 12, characterized in that, In the unfolded and elongated state The absorbent body having the absorbent core has lateral elastic regions on both sides in the left-right direction that can stretch and extend along the long side direction. When viewing the absorbent article from either the non-skin side or the skin side, a side-colored area that is colored along the long side direction is provided in the side elastic region. The maximum width in the left-right direction of the specific color area in the elastic area under the crotch is greater than the maximum width in the long side direction of the colored area of ​​the waist and the maximum width in the left-right direction of the colored area of ​​the side.

16. An absorbent article having an absorbent core, characterized in that, In the unfolded and elongated state It has intersecting long sides, left and right directions, and thickness direction. It has an elastic region in the groin area defined by a telescopic portion of an elastic component, which is positioned further away from the skin than the absorbent core and extends and retracts along the long side. At least a portion of the elastic crotch area is provided in the lower crotch region, which is the central region when the absorbent article is divided into three equal parts along its long side. It has a peripheral area surrounding the elastic area in the groin. The surrounding area is defined as follows: in the left-right direction, it extends from a position half the width of the elastic crotch area to the left of the left end of the elastic crotch area, and from a position half the width of the elastic crotch area to the right of the right end of the elastic crotch area; and in the long-side direction, it extends from a position half the width of the elastic crotch area to the position half the width of the elastic crotch area to the other end of the elastic crotch area. When observing the absorbent material from the non-skin side, An area having a background color, and an area of ​​a specific color that is different from the background color. The background color area is the area that occupies the largest area in the lower crotch region. Regarding at least one of the long side direction and the left-right direction, the total length of the specific color region disposed in one of the regions of the crotch elastic region and the peripheral region is more than half the length of the region of that one side.

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