Absorbent article

Abstract

The invention provides an absorbent article. The purpose of the present invention is to improve the designability of a colored sheet having colored fibers. The absorbent article (1) is provided with a colored sheet (70), and the colored sheet (70) is provided with colored fibers. When measured from at least one of the skin-side surface and the non-skin-side surface of the absorbent article, the difference between the maximum value of a reference color difference, which is a color difference with respect to a reference plate in a sheet arrangement region (R1) in which the colored sheet is arranged, and the minimum value of the reference color difference in the sheet arrangement region (R1) is 3.0 or more.

Description

Technical Field

[0001] The present invention relates to an absorbent article having a fiber sheet with colored fibers. Background Art

[0002] Patent document 1 discloses a fiber sheet having colored fibers. The colored fiber sheet is configured to be visually recognizable from the outside of the absorbent article. The fiber sheet is provided on an absorbent body, and the entire absorbent body or a portion of the layer in the thickness direction is colored by the dyed fibers. According to the absorbent article of Patent document 1, the absorbent body can be made conspicuous by coloring.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-64132 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] However, the fiber sheet of Patent Document 1 is dyed in a single color, and its design properties cannot be sufficiently improved. The present invention aims to improve the design properties of a colored sheet having colored fibers.

[0008] Solutions for solving problems

[0009] An absorbent article of one embodiment has a colored sheet having colored fibers. When measuring from at least one of a skin-side surface and a non-skin-side surface of the absorbent article, a difference between a maximum value of a reference color difference with respect to a reference plate in a sheet arrangement region where the colored sheet is arranged and a minimum value of the reference color difference in the sheet arrangement region is 3.0 or more. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic front view of the absorbent article 1 according to the embodiment.

[0011] Figure 2 It is a plan view of the absorbent article 1 according to the embodiment in a developed and stretched state.

[0012] Figure 3 It is along Figure 2 A cross-sectional view along line AA is shown.

[0013] Figure 4 It is a schematic cross-sectional view of a colored sheet.

[0014] Description of Reference Numerals

[0015] 1. Absorbent article; 15. Absorbent body; 21. Absorbent core; 31. Surface sheet (non-skin side fiber sheet); 32. Back sheet; 50. Outer body; 51. Front outer body; 52. Back outer body; 55. Skin side sheet; 56. Non-skin side sheet (non-skin side fiber sheet); 58. Waist elastic member; 60. Side joint; 62. Waist opening; 66. Leg opening; 70. Colored sheet; R1. Sheet configuration area; R2. Sheet non-configuration area; S1. Front waist area; S2. Back waist area; S3. Crotch area; L. Front-to-back direction; T1. Skin side; T2. Non-skin side; W. Width direction. DETAILED DESCRIPTION

[0016] (1) Overview of Implementation

[0017] At least the following matters are clarified from the description of this specification and the drawings.

[0018] In the absorbent article of mode 1, the absorbent article has a colored sheet having colored fibers. When measuring from at least one of the skin-side surface and the non-skin-side surface of the absorbent article, the difference between the maximum value of the reference color difference relative to the reference plate in the sheet arrangement area where the colored sheet is arranged and the minimum value of the reference color difference in the sheet arrangement area is 3.0 or more. According to this mode, since the difference between the maximum value and the minimum value is 3.0 or more, the user can recognize multiple colors in the colored sheet, and a higher decorative effect can be achieved compared to a single-color sheet, and the design can be improved.

[0019] According to a preferred embodiment, the invention of embodiment 2 may have the following features in the invention of embodiment 1. When measured from the surface of the one side of the absorbent article, the difference between the maximum value of the reference color difference in the sheet configuration area and the minimum value of the reference color difference in the sheet configuration area is 10.0 or less. According to this embodiment, since the difference between the maximum value and the minimum value is 10.0 or less, it is easy for a user to recognize a plurality of colors as different but similar colors, and it is easy to recognize a design as a pattern having a plurality of similar colors integrated. Therefore, the design of the colored sheet can be further improved.

[0020] According to a preferred embodiment, the invention of embodiment 3 may have the following features in the invention of embodiment 1 or embodiment 2. The absorbent article has a sheet non-configuration area, which is adjacent to the sheet configuration area and is not configured with the colored sheet. When measured from the surface of the one side of the absorbent article, the difference between the average value of the reference color difference in the sheet non-configuration area and the average value of the reference color difference in the sheet configuration area is 3.0 or more. According to this embodiment, since the difference between the average value of the reference color difference in the sheet non-configuration area and the average value of the reference color difference in the sheet configuration area is 3.0 or more, the user can recognize the sheet configuration area and the sheet non-configuration area as different areas, and can easily recognize the design of the sheet configuration area.

[0021] According to a preferred embodiment, for the invention of embodiment 4, in the invention of any one of embodiments 1 to 3, the following features may be provided. The sheet configuration area has a stretchable stretchable area. When the average value of the reference color difference in the natural state of the stretchable area is set as the natural average value, and the average value of the reference color difference in the stretched state of the stretchable area is set as the stretched average value, one of the natural average value and the stretched average value is more than 1.5 times the other. When the absorbent article is worn or operated, the stretchable area stretches and contracts. At this time, the color tone of the stretchable area changes significantly, which can improve the design of the colored sheet. In addition, the stretchable form of the colored sheet can be indicated by the change of color, and the function of stretching the area where the colored sheet is configured can be conveyed to the user visually, and the user can grasp the function of the absorbent article sensorily.

[0022] According to a preferred embodiment, the invention of embodiment 5 may have the following features in any one of embodiments 1 to 4. The colored sheet is disposed on the surface of the one side of the absorbent article. According to this embodiment, the user visually recognizes the surface of the one side of the absorbent article, thereby making it easier for the user to visually recognize the colored sheet and to understand the color tone and design of the colored sheet.

[0023] According to a preferred embodiment, the invention of embodiment 6 may have the following features in any one of embodiments 1 to 5. The absorbent article has an absorbent core. The colored sheet is arranged separately from the absorbent core when the absorbent article is viewed from above. According to this embodiment, the colored sheet with high design is arranged separately from the absorbent core when viewed from above, so that the user focuses on the colored sheet, the visual recognition of the absorbent core can be relatively reduced, and the visual recognition of the excrement absorbed by the absorbent core can be reduced.

[0024] According to a preferred embodiment, the invention of embodiment 7 may have the following features in any one of embodiments 1 to 5. The absorbent article has an absorbent core. The colored sheet is arranged at a position closer to the one side than the absorbent core in the region overlapping with the absorbent core. According to this embodiment, the colored sheet can be used to cover the excrement absorbed by the absorbent core, and the visual recognition of the excrement absorbed by the absorbent core can be reduced.

[0025] According to a preferred embodiment, for the invention of embodiment 8, in the invention of any one of embodiments 1 to 7, the following features may be provided. When measured from the surface on the skin side of the absorbent article, the difference between the maximum value of the reference color difference in the sheet configuration area and the minimum value of the reference color difference in the sheet configuration area is greater than 3.0. The absorbent article has a non-skin side fiber sheet, which abuts against the surface on the non-skin side of the colored sheet and has fibers. The fiber density of the non-skin side fiber sheet is higher than that of the colored sheet. According to this embodiment, it is easy to guide the body fluid absorbed by the colored sheet to the non-skin side fiber sheet through the density gradient of the fibers. Therefore, it is easy to suppress the situation where the design of the colored sheet is reduced due to the body fluid absorbed by the colored sheet, and when visually identifying from the skin side of the absorbent article, it is easy for the user to continue to visually identify the colored sheet with higher design.

[0026] According to a preferred embodiment, the invention of embodiment 9 may have the following features in any one of embodiments 1 to 8. The colored sheet is a laminated sheet formed by laminating a first layer of fibers having a certain color and a second layer of fibers having a color different from the certain color. According to this embodiment, a colored sheet having a plurality of color tones can be formed at a low cost without using a plurality of nonwoven fabrics having different colors.

[0027] According to a preferred embodiment, the invention of embodiment 10 may have the following features in any one of embodiments 1 to 9. A pattern is formed on the outer surface of the colored sheet. According to this embodiment, the design of the colored sheet can be further improved by the pattern provided on the outer surface of the colored sheet.

[0028] In the inventions of modes 1 to 10, unless there is a special state regulation, the above structure can be satisfied in at least one of the absorbent articles in the natural state and the absorbent articles in the stretched state. Specifically, for example, in at least one of the absorbent articles in the natural state and the absorbent articles in the stretched state, the difference between the maximum value of the reference color difference and the minimum value of the reference color difference can be 3.0 or more.

[0029] (2) Absorbent article according to the embodiment

[0030] Hereinafter, the absorbent article 1 of the embodiment will be described with reference to the accompanying drawings. In addition, in the description of the following drawings, the same or similar parts are marked with the same or similar reference numerals. However, it should be noted that the drawings are schematic diagrams, and the ratios of various dimensions, etc. are different from the actual situation. Therefore, the specific dimensions, etc. should be determined by referring to the following description. In addition, the drawings can also include parts with different dimensional relationships and ratios.

[0031] The absorbent article 1 is an absorbent article capable of absorbing body fluids of the wearer. The absorbent article 1 may be a disposable diaper or incontinence pad for absorbing urine, a sanitary napkin for absorbing menstrual blood, or a panty liner for absorbing leucorrhea. The disposable diaper may be a belt type or a shorts type. The absorbent article 1 of this embodiment is a shorts type disposable diaper. Figure 1 It is a schematic front view of the absorbent article 1 according to the embodiment. Figure 2 It is a schematic plan view of the absorbent article 1 according to the embodiment in a developed and stretched state, as viewed from the skin side T1. Figure 2 The figure of the unfolded and stretched state shown in the figure shows the stretched state in which the absorbent article 1 is stretched to a state where no wrinkles are formed in the state where the side joint 60 described later is unfolded. The "stretched state" in the present invention refers to a state in which the whole (the whole product) is stretched without wrinkles, and specifically refers to a state in which the size of each component constituting the absorbent article 1 is stretched to a size that is consistent with or close to the size of the component alone. In addition, the "natural state" refers to the state when the absorbent article 1 is placed for a predetermined time. For example, the waist portion of the absorbent article 1 in the product state taken out of the package is stretched to both outer sides in the left and right directions, and the waist portion is set to the "stretched state". After the stretched state continues for 15 seconds, the stretching of the absorbent article 1 is released and placed on a flat surface such as a table. Then, the state after 5 minutes of being placed flat on such a flat surface is set to the natural state.

[0032] The absorbent article 1 has a front waist region S1, a rear waist region S2 and a crotch region S3. The front waist region S1 is a region opposite to the front waist (abdomen) of the wearer. The rear waist region S2 is a region opposite to the rear waist (back) of the wearer. The crotch region S3 is located at the crotch of the wearer and is a region disposed between the front waist region S1 and the rear waist region S2. The crotch region S3 may also be a region provided with a leg opening 66.

[0033] like Figure 1As shown, it may be provided with a side joint 60 that joins the end of the front waist region S1 (front outer body 51) in the width direction W and the end of the rear waist region S2 (rear outer body 52) in the width direction W. The side joint 60 is defined by a portion that locks the outer side of the front waist region S1 and the outer side of the rear waist region S2 to each other. In a state where the side joint 60 is formed, the absorbent article 1 is formed with: a waist opening 62 for the wearer's waist to pass through and surround the wearer's waist; and a pair of leg openings 66 for the wearer's legs to be inserted and surround the wearer's legs. The waist opening 62 can be defined by the front edge of the front waist region S1 and the rear edge of the rear waist region S2. Figure 2 The absorbent article 1 is shown in a state where the side joints 60 are released and the absorbent article 1 is unfolded.

[0034] In addition, the outer side portion of the present invention refers to a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer side edge refers to the outer edge in the width direction W. The inner side portion of the present invention refers to a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner side edge refers to the inner edge in the width direction W. In addition, the front end portion and the rear end portion of the present invention are portions occupying a certain range in the front-to-back direction L including the edge in the front-to-back direction L, and the front end edge and the rear end edge are the edges in the front-to-back direction L. The outer side portion includes the front end portion and the rear end portion, and the outer side edge includes the front end edge and the rear end edge.

[0035] The absorbent article 1 may include an outer body 50 and an absorbent body 15. The outer body 50 may include a portion disposed at a position closer to the non-skin side T2 than the absorbent body 15, and at least covers the waist of the wearer. A portion of the outer body 50 (e.g., a colored sheet 70) may be disposed at a position closer to the skin side T1 than the absorbent body 15. The outer body 50 may include a front outer body 51 disposed in the front waist region S1 and a rear outer body 52 disposed in the rear waist region S2. The front outer body 51 and the rear outer body 52 may be separately disposed in the front-to-back direction L. In a modified example, the front outer body 51 and the rear outer body 52 may also be integrated. The front outer body 51 and the rear outer body 52 may include: a skin side sheet 55, which is arranged on the skin side T1 in the thickness direction T; a non-skin side sheet 56, which is stacked on the non-skin side of the skin side sheet 55 in a manner adjacent to the skin side sheet 55; and a waist elastic member 58 such as an elastic cord (see Figure 3 ) which is arranged between the skin side piece 55 and the non-skin side piece 56.

[0036] The skin side piece 55 and the non-skin side piece 56 are rectangular sheet members when viewed from above, and can be formed of non-woven fabrics such as SMS non-woven fabrics. The outer end of the non-skin side piece 56 in the front-to-back direction L can have a folding portion 56f, which folds back from the non-skin side T2 toward the skin side T1 and from the outside toward the inside in the front-to-back direction L. However, the folding portion 56f may not be provided. The waist elastic member 58 is a stretchable member that can be stretched in the width direction and is arranged along the width direction W. In this embodiment, a white elastic line is used. A plurality of waist elastic members 58 are arranged in an array along the front-to-back direction L between the skin side piece 55 and the non-skin side piece 56, and are installed in a state stretched along the width direction W. The elasticity of the waist elastic member 58 makes the front waist region S1 and the back waist region S2 fit the waist of the wearer. Furthermore, the absorbent article 1 of this embodiment is provided with the waist elastic member 58, but is not limited to elastic threads, and a stretch member such as a stretch sheet may be disposed to stretch the front waist region S1 and the back waist region S2 in the left-right direction.

[0037] The absorbent body 15 may be arranged across the front waist region S1, the back waist region S2, and the crotch region S3. The absorbent body 15 may be separately formed relative to the front outer body 51 and the back outer body 52, and may be joined to the front outer body 51 and the back outer body 52 in the front waist region S1 and the back waist region S2, respectively. The absorbent body 15 may have at least an absorbent core 21, a surface sheet 31 arranged at a position closer to the skin side T1 than the absorbent core 21, and a back sheet 32 ​​arranged at a position closer to the non-skin side T2 than the absorbent core 21.

[0038] Absorbent core 21 can contain for example pulverized pulp or superabsorbent polymer (SAP), or the mixture of the above materials. Absorbent core 21 can be covered by core wrapper (not shown). Surface sheet 31 can be a liquid-permeable sheet. Back sheet 32 ​​can have liquid-impermeable leakproof sheet 32A and main body outer side sheet 32B configured at the position of non-skin side than leakproof sheet 32A. It can be that leakproof sheet 32A is made of film, and main body outer side sheet 32B is made of nonwoven fabric.

[0039] The absorbent article 1 may have a stretchable member that is stretchable in at least one of the front-to-back direction L and the width direction W. The stretchable member may be provided in the outer body 50 or in the absorbent body 15. The stretchable member may be composed of an elastic cord or a stretch sheet. In the present embodiment, at least a waist elastic member 58 is provided in the rear waist region S2 and the front waist region S1. The waist elastic member 58 provided in the rear waist region S2 is configured to overlap with the colored sheet 70 so that at least a portion of the sheet configuration region R1 where the colored sheet 70 is provided is stretched.

[0040] The absorbent article 1 has a colored sheet 70 having colored fibers. The colored sheet 70 is configured to be visually recognizable from at least one side of the skin side T1 and the non-skin side T2 of the absorbent article 1. The state in which the absorbent article 1 can be visually recognizable from one side may be a state in which the object (e.g., the colored sheet 70) to be evaluated for visual recognition is arranged on one side of the absorbent article (the skin side in this embodiment), or a state in which the visible light transmittance is 60% or more in a state in which a member located at a position closer to the object is overlapped. In addition, the state in which the absorbent article 1 can be visually recognizable means that a subject with good visual acuity (1.0 or more) in both eyes can visually recognize the object when observing the object from the skin side T1 of the absorbent article 1 at a distance of about 30 cm to 50 cm in a room brightly illuminated with daylight color (reference value of color temperature 4600K to 5400K (degrees Kelvin)). The colored sheet 70 of the present embodiment is composed of an absorbent sheet disposed on the surface of the skin side T1 of the rear waist region S2, and is disposed on the surface of the skin side T1 of the absorbent article 1 so that it can be visually recognized from the skin side T1 of the absorbent article 1. In addition, the colored sheet is not limited to the absorbent sheet, and it can be composed of other components of the outer body 50 or components of the absorbent body 15.

[0041] In the colored sheet 70, at least part of the fibers constituting the sheet may be colored with a predetermined color. The colored sheet 70 may be made of a fabric or a nonwoven fabric. The colored sheet 70 of the present embodiment is made of a nonwoven fabric. The fibers may be colored with colors other than white. Regarding fibers colored with colors other than white, the so-called "white" is, for example, defined as: in addition to the color represented as "N9.5" in the Munsell color system and the color represented as "255,255,255" in the RGB color space (so-called pure white), colors with a color difference of less than 12 from pure white are also included in white. Regarding the measurement of the color difference of white, for example, CR-300 manufactured by Konica Minolta can be used as a colorimeter, and C light source (the standard of the International Commission on Illumination (CIE)) can be used as the light source of the measuring device. The diameter of the measuring window of the measuring device in this case is 40 mm. The color difference is ΔL*, Δa* and Δb* relative to the white reference plate in the (L*a*b*) color space. The color difference relative to the white reference plate can be calculated by measuring the lab value of the white reference plate and the lab value of the target sample respectively. The white reference plate is set to lab0 at (X93.19, Y95.20, Z112.28). Here, L* is a value indicating brightness, and a* and b* are plane coordinates of chromaticity. If the Lab value of the white reference plate is set to L0, a0, b0, and the Lab value of the target sample is set to L1, a1, b1, it can be calculated by ΔL*=L0-L1, Δa*=a0-a1, Δb*=b0-b1. In addition, colored fibers refer to fibers other than colorless and transparent fibers and the above-mentioned white fibers, which can be achieved by coloring the fibers with a predetermined colorant (dye, content), etc.

[0042] The absorbent article has a sheet configuration area R1 where a colored sheet 70 is configured. The sheet configuration area R1 is an area where the colored sheet 70 is configured when viewed from above. More specifically, the sheet configuration area R1 is an area where a colored sheet 70 that can be visually identified in at least one of a state where the absorbent article 1 is visually identified from the skin side T1 and a state where the absorbent article 1 is visually identified from the non-skin side T2 is configured. The colored sheet 70 of the present embodiment is configured on the surface of the skin side T1 of the absorbent article 1, can be visually identified from the skin side T1 of the absorbent article 1, and cannot be visually identified from the non-skin side T2 of the absorbent article 1. Therefore, the sheet configuration area R1 is an area where the colored sheet 70 is configured in a state where the absorbent article 1 is visually identified from the skin side T1.

[0043] When measuring from at least one of the surfaces of the skin side T1 and the non-skin side T2 of the absorbent article 1, the difference between the maximum value of the reference color difference in the sheet configuration area R1 and the minimum value of the reference color difference in the sheet configuration area R1 is 3.0 or more. That is, any one of Type 1 to Type 3 is sufficient. For Type 1, when measuring from the surface of the skin side T1 of the absorbent article 1, the difference between the maximum value and the minimum value is 3.0 or more, and when measuring from the surface of the non-skin side T2 of the absorbent article 1, the difference between the maximum value and the minimum value is less than 3.0. For Type 2, when measuring from the surface of the skin side T1 of the absorbent article 1, the difference between the maximum value and the minimum value is less than 3.0, and when measuring from the surface of the non-skin side T2 of the absorbent article 1, the difference between the maximum value and the minimum value is 3.0 or more. For type 3, when measuring from the surface of the skin side T1 of the absorbent article 1, the difference between the maximum value and the minimum value is 3.0 or more, and when measuring from the surface of the non-skin side T2 of the absorbent article 1, the difference between the maximum value and the minimum value is 3.0 or more. The applicant conducted an in-depth study and found that by making the difference between the maximum value and the minimum value of the color difference of the sheet with fibers 3.0 or more, the user who visually recognizes the sheet will not recognize it as a single-color sheet, but as a sheet with multiple colors. In particular, in a sheet with fibers such as a nonwoven fabric, there is a tendency that the color tone is difficult to grasp compared to a smooth film, but it is known that according to a fiber sheet with a difference between the maximum value and the minimum value of 3.0 or more, the user can grasp multiple color tones. According to the absorbent article 1 having the colored sheet 70 of the present structure, when measured from at least one of the surface of the skin side T1 and the surface of the non-skin side T2 of the absorbent article 1, the difference between the maximum value and the minimum value of the reference color difference of the colored sheet 70 is 3.0 or more, so the user can recognize multiple colors in the colored sheet 70 when visually recognizing from at least one of the surface of the skin side T1 and the surface of the non-skin side T2 of the absorbent article 1. It is possible to exert a higher decorative effect than a single-color sheet, and the design can be improved. The difference between the maximum value and the minimum value of the reference color difference in the sheet arrangement area R1 is sufficient to be 3.0 or more, but it can be preferably 6.0 or more, and more preferably 8.0 or more.

[0044] Here, the reference color difference is the color difference relative to the reference plate, and the reference plate can be specified by a predetermined sample, for example, the above-mentioned white reference plate can be used. In the present embodiment, sample number NO:SN:502515 is used as the reference plate. The reference color difference can be measured, for example, using a measuring instrument of model CR8 of 3nh (Shenzhen Threenh Technology Co., Ltd.). When the measuring instrument performs the measurement, the value of the reference plate is pre-set, thereby, the color difference relative to the reference plate can be measured. In addition, the color difference can be measured in an absorbent article in an elongated state. Therefore, for example, the difference between the maximum value and the minimum value can be satisfied in an absorbent article in an elongated state. However, the color difference can also be measured in an absorbent article in a natural state. For example, the difference between the maximum value and the minimum value can be satisfied in an absorbent article in a natural state. For the measurement of the maximum and minimum values ​​of the reference color difference in the sheet configuration area R1, the reference color difference is measured at any measurement location within the sheet configuration area R1. The interval and number of measurement sites are not particularly limited, but preferably, at least one measurement site is set in a 10 mm square. The value with the highest reference color difference among the overall measurement values ​​is set as the maximum value, and the value with the lowest reference color difference among the overall measurement values ​​is set as the minimum value. The difference between the maximum value and the minimum value can be calculated by subtracting the maximum value from the minimum value.

[0045] When measured from one side of the absorbent article 1, the difference between the maximum value of the reference color difference in the sheet arrangement region R1 and the minimum value of the reference color difference in the sheet arrangement region R1 may be 10.0 or less. By making the difference between the maximum value and the minimum value of the reference color difference 10.0 or less, the user can easily recognize the multiple colors as different but similar colors, and can easily recognize the design as a pattern having multiple similar colors integrated. Therefore, the design of the colored sheet 70 can be further improved.

[0046] The absorbent article 1 may have a sheet non-configuration area R2, which is adjacent to the sheet configuration area R1 and is not configured with a colored sheet 70 when viewed from above. In the present embodiment, the sheet non-configuration area R2 is respectively configured on the front and rear sides of the sheet configuration area R1. When measured from the surface of one side of the absorbent article 1, the difference between the average value of the reference color difference in the sheet non-configuration area R2 and the average value of the reference color difference in the sheet configuration area R1 may be 3.0 or more. Since the difference between the average value of the reference color difference in the sheet non-configuration area R2 and the average value of the reference color difference in the sheet configuration area R1 is 3.0 or more, the user can recognize the sheet configuration area R1 and the sheet non-configuration area R2 as different areas, and it is easy to recognize the design of the sheet configuration area R1. Here, the average value of the reference color difference can be obtained as follows: in the above-mentioned color difference measurement method, the reference color difference is measured at intervals of 10 mm in the front-back direction and the width direction of each area, and the average value of the overall measured value is calculated. The difference between the average value of the reference color difference in the sheet non-configuration area R2 and the average value of the reference color difference in the sheet configuration area R1 may be 3.0 or more, but preferably may be 6.0 or more, and more preferably may be 9.0 or more. In addition, the difference between the average value of the reference color difference in the sheet non-configuration area R2 in the natural state of the absorbent article 1 and the average value of the reference color difference in the sheet configuration area R1 may be greater than the difference between the average value of the reference color difference in the sheet non-configuration area R2 in the stretched state of the absorbent article 1 and the average value of the reference color difference in the sheet configuration area R1. Specifically, the difference between the average value of the reference color difference in the sheet non-configuration area R2 in the natural state of the absorbent article 1 and the average value of the reference color difference in the sheet configuration area R1 may be 10.0 or more, and the difference between the average value of the reference color difference in the sheet non-configuration area R2 in the stretched state of the absorbent article 1 and the average value of the reference color difference in the sheet configuration area R1 may be 9.0 or more.

[0047] The sheet configuration area R1 may have a stretchable stretchable area. The stretchable area may be an area where the colored sheet 70 itself can stretch or an area that can be stretched by a stretchable member (e.g., a waist elastic member 58) that is arranged overlapping with the colored sheet 70. If the average value of the reference color difference in the natural state of the stretchable area is set as the natural average value, and the average value of the reference color difference in the stretched state of the stretchable area is set as the stretched average value, then one of the natural average value and the stretched average value may be more than 1.5 times relative to the other. That is, for the reference color difference in the stretched state and the reference color difference in the natural state, one differs from the other by more than 1.5 times. When the absorbent article 1 is worn or operated, the stretchable area stretches. At this time, the color tone of the stretchable area changes significantly, which can improve the design of the colored sheet 70. In addition, the stretchable form of the colored sheet 70 can be indicated by a change in color, and the function of stretching the area where the colored sheet 70 is arranged can be conveyed to the user visually, and the user can grasp the function of the absorbent article 1 in sense.

[0048] The colored sheet 70 may be disposed on one side of the absorbent article 1. That is, the colored sheet 70 may be exposed without being covered by any member in a state of being visually recognized from one side of the absorbent article 1. The colored sheet 70 of this embodiment is exposed on the skin side T1 surface of the absorbent article 1. According to this structure, it is easier for the user to visually recognize the colored sheet 70 and to understand the color tone and design of the colored sheet 70.

[0049] The colored sheet 70 may be arranged separately from the absorbent core 21 when the absorbent article 1 is viewed from above. That is, the colored sheet 70 may be arranged in an area that does not overlap with the absorbent core 21 when the absorbent article is viewed from above. According to this structure, since the colored sheet 70 with high design is arranged separately from the absorbent core when viewed from above, the user focuses on the colored sheet 70, the visual recognition of the absorbent core 21 can be relatively reduced, and the visual recognition of the excrement absorbed by the absorbent core 21 can be reduced. The colored sheet 70 of this embodiment is arranged at a position closer to the rear side than the absorbent core 21. In more detail, the front end edge of the colored sheet 70 is located at a position closer to the rear side than the rear end edge of the absorbent core 21, and the rear end edge of the colored sheet is located at a position closer to the front side than the waist opening 62 of the rear waist region.

[0050] In a modified example, the colored sheet 70 may be arranged at a position closer to one side than the absorbent core 21 in the region overlapping with the absorbent core 21. That is, the colored sheet 70 may be arranged to cover one side of the absorbent core (the skin side in this embodiment). According to this structure, the colored sheet 70 can be used to cover the excrement absorbed by the absorbent core 21, and the visual recognition of the excrement absorbed by the absorbent core 21 can be reduced.

[0051] Absorbent article 1 can have non-skin side fiber sheet, and this non-skin side fiber sheet abuts the surface of non-skin side T2 of colored sheet 70, and has fiber.In the present embodiment, the folded back portion 56f of non-skin side sheet 56 and surface sheet 31 are arranged on the surface of non-skin side of colored sheet 70. Non-skin side sheet 56 and surface sheet 31 are both made of non-woven fabric with fiber, and constitute non-skin side fiber sheet. The fiber density of non-skin side fiber sheet can be higher than the fiber density of colored sheet.According to this structure, it is easy to guide the body fluid absorbed by colored sheet 70 to non-skin side fiber sheet by the density gradient of fiber.Therefore, it is easy to suppress the situation that the design of colored sheet 70 is reduced due to the body fluid absorbed by colored sheet 70, and when visually identifying from the skin side of absorbent article, it is easy for user to continue visually identifying the colored sheet 70 with higher design. In addition, in a method in which a plurality of sheets constitute the non-skin side fiber sheet as in the present embodiment, it is sufficient that at least one sheet of the non-skin side fiber sheet has a higher fiber density, but preferably, all of the non-skin side fiber sheets have a higher fiber density. In addition, the fiber density of each sheet is preferably compared by a known method. For example, the fiber density of each sheet is measured as being uniform, but in the case of being uneven, a plurality of locations are measured and compared with their average density. As a method for comparing fiber density, for example, a predetermined size is cut out from each sheet as a sample, the area and mass of each sample are measured, and the mass per unit area, i.e., the basis weight (g / m 2 In addition, the thickness of each sample was measured by the above method, and the density (g / m2) was calculated by dividing the basis weight (g / m2) of the sample by the thickness (m). 3 ).

[0052] Figure 4 It is a diagram schematically showing a cross section of a colored sheet 70. The colored sheet 70 can be a laminated sheet formed by laminating the first layer 71 of a fiber 75 having a certain color and the second layer 72 of a fiber 76 having a color different from a certain color. The first layer 71 and the second layer 72 overlap in the thickness direction. By constituting the colored sheet 70 by two layers of laminated sheets having different colors, it is possible to form a color in which two colors intersect in the two layers overlapped in the thickness direction T. In more detail, if the user observes the colored sheet 70 from the thickness direction (non-skin side or skin side), it is possible to visually recognize a pattern such as a spot of light and dark produced on the surface. This is because the colored sheet 70 is formed by laminating a plurality of layers having different colors. Therefore, it is possible to constitute a colored sheet with a plurality of tones at a low cost without using a plurality of nonwoven fabrics having different colors. In addition, the colored sheet can have at least the first layer and the second layer, and can also have the third layer, and the third layer has fibers having a color different from the first layer and the second layer. In addition, the colored sheet 70 may include a plurality of first layers 71 or a plurality of second layers 72 .

[0053] Here, "a certain color" may be a color including white, and "a color different from a certain color" may be a color other than white when the certain color is white, and may be a color including white when the certain color is not white. That is, at least a portion of the fibers contained in the colored sheet may be colored with a color other than white, and the colored sheet may also contain white fibers. In addition, the so-called first layer and second layer are "different colors" as long as the user can visually identify the colors of each layer as different colors. Specifically, when the above-mentioned colorimeter or an equivalent machine is used for measurement, when the L*a*b* value of the first layer is (L1*, a1*, b1*) and the L*a*b* value of the second layer is (L2*, a2*, b2*), the color difference ΔE between the first layer and the second layer is = {(L1*-L2*) 2 +(a1*-a2*) 2 +(b1*-b2*) 2} 1 / 2 Alternatively, the color scale may be shifted by 2 or more on the 24-color scale classified by the Ostwald color wheel.

[0054] Preferably, the colored sheet 70 can be a nonwoven fabric. Usually, the fiber density of the nonwoven fabric is different according to different positions, forming the so-called "uneven texture". Therefore, when the colored sheet 70 is a nonwoven fabric with a first layer 71 and a second layer 72 of different colors, the color density becomes uneven, and multiple tones can be visually recognized on the surface of a nonwoven fabric. For example, the tones are different in a part of the first layer and other regions of the first layer, and even in the same region (such as region), the concentration of the color is uneven. In addition, the layers of different colors overlap, thereby further complicating the visuality of the surface color of a nonwoven fabric, for example, patterns such as marble patterns and rainbow colors can be visually recognized. In addition, the colored sheet 70 composed of nonwoven fabric can have a plurality of welded portions 77 formed by welding fibers. In the portion where the welded portion 77 is formed, the density of the colored sheet is improved, so it is easier to produce the color density than the case where the welded portion 77 is not formed. For example, when viewed from the thickness direction, the color of the portion where the welded portion 77 is formed appears darker than the other portions. Therefore, the user can more easily recognize the difference in color tone.

[0055] The present invention is described in detail above using the above-mentioned embodiment, but it is obvious to those skilled in the art that the present invention is not limited to the embodiment described in this specification. For example, in the present embodiment, the colored sheet is arranged on the surface of the skin side of the absorbent article, but the colored sheet can be arranged on the surface of the non-skin side of the absorbent article, or can be arranged at a position closer to the inside in the thickness direction than the surface of the skin side of the absorbent article, or can be arranged at a position closer to the inside in the thickness direction than the surface of the non-skin side of the absorbent article. In addition, the colored sheet can be arranged in the front waist region or in the absorbent body. The present invention can be implemented as a modified and altered mode without departing from the subject matter and scope of the present invention determined by the description of the claims. Therefore, the description of this specification is for the purpose of illustrative description and does not have any restrictive meaning to the present invention.

Claims

1. An absorbent article having a colored sheet having colored fibers, wherein: When measuring from at least one of the skin-side surface and the non-skin-side surface of the absorbent article, the difference between the color difference relative to the reference plate in the sheet configuration area where the colored sheet is configured, i.e., the maximum value of the reference color difference and the minimum value of the reference color difference in the sheet configuration area is greater than 3.

0.

2. The absorbent article according to claim 1, wherein When measured from the one surface of the absorbent article, a difference between a maximum value of the reference color difference in the sheet arrangement region and a minimum value of the reference color difference in the sheet arrangement region is 10.0 or less.

3. The absorbent article according to claim 1 or 2, wherein: The absorbent article has a sheet non-arrangement region, which is adjacent to the sheet arrangement region and in which the colored sheet is not arranged. When measured from the one surface of the absorbent article, a difference between an average value of the reference color difference in the sheet non-arrangement region and an average value of the reference color difference in the sheet arrangement region is 3.0 or more.

4. The absorbent article according to claim 1 or 2, wherein: The sheet configuration area has a retractable area, When the average value of the reference color difference in the natural state of the stretch region is set as the natural average value, and the average value of the reference color difference in the stretched state of the stretch region is set as the stretched average value, one of the natural average value and the stretched average value is greater than or equal to 1.5 times the other.

5. The absorbent article according to claim 1 or 2, wherein: The colored sheet is disposed on the one surface of the absorbent article.

6. The absorbent article according to claim 1 or 2, wherein: The absorbent article has an absorbent core, The colored sheet is arranged to be separated from the absorbent core in a plan view of the absorbent article.

7. The absorbent article according to claim 1 or 2, wherein: The absorbent article has an absorbent core, The colored sheet is arranged closer to the one side than the absorption core in a region overlapping with the absorption core.

8. The absorbent article according to claim 1 or 2, wherein: When measured from the skin-side surface of the absorbent article, the difference between the maximum value of the reference color difference in the sheet arrangement region and the minimum value of the reference color difference in the sheet arrangement region is 3.0 or more, The absorbent article has a non-skin side fiber sheet, the non-skin side fiber sheet is in contact with the non-skin side surface of the colored sheet and has fibers. The fiber density of the non-skin-side fiber sheet is higher than the fiber density of the colored sheet.

9. The absorbent article according to claim 1 or 2, wherein: The colored sheet is a laminated sheet in which a first layer of fibers having a certain color and a second layer of fibers having a color different from the certain color are laminated.

10. The absorbent article according to claim 1 or 2, wherein: The colored sheet has spots formed on its outer surface.

Images