Disposable diaper

Abstract

To provide a disposable diaper in which a separate auxiliary absorber is easily set at an appropriate position.SOLUTION: There is provided a disposable diaper 1 in which an absorbent main body 11 is disposed on the skin surface side of an exterior member 31, wherein the absorbent main body 11 has an absorbent body 14 disposed between a top sheet 12 and a back sheet 13, and rising flaps 15 are provided on both sides in a widthwise direction of the skin surface side, the back sheet 13 has a folded-back skin side portion 13A in which both side portions in the widthwise direction are folded back to the skin surface side of the absorbent body 14 and the folded-back skin side portion 13A formed from a portion between a folded skin side 13B and located on the non-skin surface side of the absorbent body 14, the absorbent main body 11 has non-bonded portions 18 at both widthwise ends where the non-skin side of the absorbent main body 11 is not fixed to the outer member 31, a first colored portion 21 is provided on the folded-back skin side portion 13A of the back sheet 13, and a second colored portion 22 is provided on the non-bonded portion 18 of the non-skin side portion 13B of the back sheet 13.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Disposable diapers bearing various marks and labels have been known. For example, Patent Document 1 discloses a disposable diaper in which an absorbent body is provided in the crotch region of a pants-type diaper body, and a marking section indicating the size, front-rear orientation, etc. is provided on the outer surface of the diaper body. Patent Document 2 discloses a disposable diaper in which a mark for positioning a separate auxiliary absorbent body is provided on the side edge of the absorbent body on the use side of the pants-type diaper body. Patent Document 3 discloses a disposable diaper in which an absorbent body is bonded to the skin-facing side of an outer cover, the absorbent body having a non-bonded region in at least a portion of its periphery that is not bonded to the outer cover, and manufacturer information is provided on the outer surface of the non-bonded region. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2005 / 023160 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-307298 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-224245 Summary of the Invention [Problem to be solved by the invention]

[0004] A conventional method involves placing a separate auxiliary absorbent body on the skin-facing side of a disposable diaper. This method of use allows the auxiliary absorbent body to first receive urine and other excretions from the wearer, thereby reducing the total cost of the absorbent article by replacing only the auxiliary absorbent body as needed and continuing to use the disposable diaper attached to it. Furthermore, replacing only the auxiliary absorbent body makes the job of changing the diaper easier for caregivers than replacing the disposable diaper attached to the auxiliary absorbent body.

[0005] When an auxiliary absorbent body is used in combination with a disposable diaper, it is necessary to set the auxiliary absorbent body in an appropriate position on the skin-facing side of the disposable diaper. Specifically, since disposable diapers usually have rise-up flaps on both sides of the skin-facing side in the width direction, it is necessary to set the auxiliary absorbent body in an appropriate position between the rise-up flaps on both sides in the width direction. The present invention has been made in view of the above circumstances, and its object is to provide a disposable diaper in which a separate auxiliary absorbent body can be easily set in an appropriate position. [Means for solving the problem]

[0006] The disposable diaper of the present invention that can solve the above problems is as follows. [1] A disposable diaper having an outer cover having a front-to-back direction and a width direction, a front waist section, a rear waist section, and a crotch section located therebetween, and an absorbent body disposed on the skin-facing side of the outer cover and fixed to the crotch section, The absorbent main body has an absorbent body, a top sheet arranged on the skin-facing side of the absorbent body, and a back sheet arranged on the non-skin-facing side of the absorbent body, and is provided with rising flaps on both sides in the width direction of the skin-facing side, the backsheet has folded-back skin-side portions in which both widthwise side portions are folded back to the skin-facing side of the absorbent body, and a non-skin-side portion formed from a portion between the folded-back skin-side portions and positioned on the non-skin-facing side of the absorbent body, The absorbent main body has non-joined portions at both ends in the width direction, where the non-skin-facing side of the absorbent main body is not fixed to the exterior member, The disposable diaper has a first colored portion provided on the folded-back skin-side portion of the backsheet, and a second colored portion provided on the non-joined portion of the non-skin-side portion of the backsheet. [2] A disposable diaper as described in [1], wherein the area ratio of the first colored portion in the folded skin side portion is greater than the area ratio of the second colored portion in the non-joined portion of the non-skin side portion. [3] A disposable diaper as described in [1], wherein the area ratio of the second colored portion in the non-joined portion of the non-skin side portion is greater than the area ratio of the first colored portion in the folded-over skin side portion. [4] A disposable diaper according to any one of [1] to [3], wherein the saturation of the first colored portion is higher than the saturation of the second colored portion, and / or the brightness of the first colored portion is lower than the brightness of the second colored portion. [5] A disposable diaper according to any one of [1] to [3], wherein the saturation of the second colored portion is higher than the saturation of the first colored portion, and / or the brightness of the second colored portion is lower than the brightness of the first colored portion. [6] The disposable diaper according to any one of [1] to [5], wherein the first colored portion is colored a different color from the second colored portion. [7] A disposable diaper according to any one of [1] to [6], wherein the rising flap has a front end, a rear end and a flap intermediate portion therebetween, the front end and the rear end being joined to the folded-back skin side portion directly or via the top sheet, the flap intermediate portion being formed to be able to rise, and the first colored portion of the folded-back skin side portion being arranged to overlap the flap intermediate portion. [8] A disposable diaper as described in [7], wherein in the flap intermediate portion, the first colored portion of the folded skin side portion is provided so as to overlap the base of the rising flap. [9] A disposable diaper according to any one of [1] to [8], wherein the rising flap has a front end, a rear end and a flap intermediate portion therebetween, the front end and the rear end being joined to the folded-back skin side portion directly or via the top sheet, the flap intermediate portion being formed to be able to rise, and the first colored portion of the folded-back skin side portion being arranged to overlap the front end and / or the rear end.

[10] A disposable diaper according to any one of [1] to [9], wherein the absorbent body has a front portion, a rear portion and an intermediate portion therebetween, the front portion and the rear portion being formed wider than the intermediate portion, the backsheet being folded back along both widthwise edges of the front portion and the rear portion of the absorbent body, and a margin portion is formed outward in the widthwise direction from both widthwise edges of the intermediate portion, in which the non-skin side portion of the backsheet and the folded-back skin side portion are overlapped without the absorbent body in between.

[11] The disposable diaper according to any one of [1] to

[10] , wherein the exterior member is formed in a pants shape having a waist opening and a pair of leg openings. [Effects of the Invention]

[0007] The disposable diaper of the present invention has a first colored portion on the folded-back skin-facing portion of the backsheet, which makes it easier to see both widthwise sides of the absorbent main body. Furthermore, a second colored portion is provided on the non-jointed portion of the non-skin-facing portion of the backsheet, which allows the second colored portion to be used as a marker to confirm whether the auxiliary absorbent body is positioned between the rising flaps on both widthwise sides, rather than overlapping the rising flaps. Therefore, the disposable diaper of the present invention makes it easy to properly position the separate auxiliary absorbent body on the skin-facing side of the disposable diaper using the first and second colored portions as markers. [Brief explanation of the drawings]

[0008] [Figure 1] 1 shows an example of the configuration of a disposable diaper according to the present invention, and is a perspective view of a disposable pants-type diaper. [Figure 2]2 is a plan view of the disposable diaper shown in FIG. 1 in a state where the front and rear waist sections are untied and unfolded, as viewed from the skin-facing side. [Figure 3] 2 is a plan view of the disposable diaper shown in FIG. 1 in a state where the front and rear waist sections are untied and laid out, as viewed from the non-skin-facing side. [Figure 4] 4 is an end view of the disposable diaper shown in FIGS. 2 and 3 taken along line IV-IV. FIG. [Figure 5] 3 shows a plan view of the absorbent body of the disposable diaper shown in FIG. 2. [Figure 6] This shows an example of the partial configuration of an absorbent body in which an absorbent body is arranged between a top sheet and a back sheet, and shows a plan view of the absorbent body viewed from the skin side, in which a first colored portion is provided on the folded-back skin side of the back sheet and a second colored portion is provided on the non-skin side of the back sheet. [Figure 7] 7 shows a planar development view of the back sheet of the absorbent main body shown in FIG. 6, and illustrates design examples of a first colored portion and a second colored portion provided on the back sheet. [Figure 8] 10 shows a planar development view of a back sheet, illustrating other design examples of a first colored portion and a second colored portion provided on the back sheet. [Figure 9] 10 shows a planar development view of a back sheet, illustrating other design examples of a first colored portion and a second colored portion provided on the back sheet. DETAILED DESCRIPTION OF THE INVENTION

[0009] The disposable diaper of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments shown in the drawings. Figs. 1 to 5 show a pants-type disposable diaper as an example of the disposable diaper of the present invention. Fig. 1 is a perspective view of the disposable diaper, Fig. 2 is a view of the disposable diaper shown in Fig. 1 when the front and rear torso sections are untied and laid out flat, as viewed from the skin-facing side, Fig. 3 is a view of the disposable diaper shown in Fig. 1 when the front and rear torso sections are untied and laid out flat, as viewed from the non-skin-facing side, Fig. 4 is a cross-sectional end view of the disposable diaper shown in Figs. 2 and 3 taken along line IV-IV, and Fig. 5 is a plan view of the absorbent main body of the disposable diaper shown in Fig. 2. In the drawings, arrow x represents the width direction, arrow y represents the front-to-back direction, and the direction perpendicular to the plane formed by arrows x and y represents the thickness direction z.

[0010] The disposable diaper 1 has an outer covering member 31 composed of a front torso portion P, a rear torso portion Q, and a crotch portion R located therebetween. In the disposable diaper 1 shown in the drawings, the outer covering member 31 has a waist opening 32 and a pair of leg openings 33, and is formed in a pants shape. The waist opening 32 is an opening for passing the wearer's torso through, and the leg openings 33 are openings for passing the wearer's legs through.

[0011] In the outer covering member 31, the front torso section P corresponds to the portion that contacts the wearer's stomach when the diaper is worn, and the rear torso section Q corresponds to the portion that contacts the wearer's back when the diaper is worn. The crotch section R is located between the front torso section P and the rear torso section Q and corresponds to the portion that contacts the wearer's crotch. The crotch section R is a middle section when the outer covering member 31 is divided into three sections in the front-to-back direction y, and when formed into a pants-like shape, it is not joined to both sides in the width direction x. When the disposable diaper 1 is a pants-type diaper, the outer covering member 31 is formed into a pants-like shape, for example, by joining the front torso section P and the rear torso section Q at side joining sections 34 on both ends in the width direction x.

[0012] In the disposable diaper 1, the front-to-back direction y means the direction from the front torso portion P to the rear torso portion Q, and corresponds to the front-to-back direction of the wearer's crotch when the diaper is worn. In the disposable diaper 1, the width direction x corresponds to the left-to-right direction of the wearer when the diaper is worn. The skin-facing side of the disposable diaper 1 means the side that faces the wearer's skin when the diaper is worn. The non-skin-facing side of the disposable diaper 1 means the side that faces away from the wearer when the diaper is worn.

[0013] An absorbent body 11 is provided in the crotch region R on the skin-facing side of the outer cover member 31. The absorbent body 11 has a top sheet 12, a back sheet 13, and an absorbent body 14 arranged between them (see Figures 4 and 5). The top sheet 12 is a sheet that faces the wearer when the diaper is in use, and is arranged on the skin-facing side of the absorbent body 14. The top sheet 12 is preferably liquid permeable. The back sheet 13 is a sheet that faces away from the wearer when the diaper is in use, and is arranged on the non-skin-facing side of the absorbent body 14. The back sheet 13 is preferably liquid impermeable. Urine and other excretions from the wearer pass through the top sheet 12 and are contained by the absorbent body 14, and the back sheet 13 prevents the excretions from leaking to the outside.

[0014] The liquid-permeable top sheet 12 may be, for example, a nonwoven fabric made of hydrophilic fibers such as cellulose, rayon, cotton, etc., or a nonwoven fabric made of hydrophobic fibers such as polyolefin (e.g., polypropylene, polyethylene), polyester (e.g., PET), polyamide (e.g., nylon), etc., in which the surface of the hydrophobic fibers has been made hydrophilic with a surfactant. Alternatively, the top sheet 12 may be made of woven fabric, knitted fabric, perforated plastic film, etc.

[0015] A nonwoven fabric made of hydrophobic fibers such as polyolefin (e.g., polypropylene, polyethylene), polyester (e.g., PET), polyamide (e.g., nylon), or a plastic film can be used as the liquid-impermeable back sheet 13. The back sheet 13 may be composed of a laminate of two or more sheets, and for example, a laminate of a nonwoven fabric and a plastic film may be used.

[0016] The nonwoven fabric constituting the top sheet 12 or the back sheet 13 may be a spunbond nonwoven fabric, a point-bond nonwoven fabric, an air-through nonwoven fabric, a melt-blown nonwoven fabric, an air-laid nonwoven fabric, a spunlace nonwoven fabric, a tow-spread nonwoven fabric, an SMS nonwoven fabric, or the like. The mass per unit area of ​​each of these sheets is 8 g / m 2 More than 10g / m is preferable. 2 More preferably, 40 g / m 2 Less than 30 g / m 2 The following is more preferred:

[0017] The backsheet 13 is provided from the non-skin-facing side to the skin-facing side of the absorbent body 14, and has folded-back skin-side portions 13A formed by folding back both side portions in the width direction x to the skin-facing side of the absorbent body 14, and non-skin-side portions 13B formed from the portion between the folded-back skin-side portions 13A and positioned on the non-skin-facing side of the absorbent body 14. The backsheet 13 is preferably folded back along both side edges in the width direction x of the absorbent body 14. The folded-back skin-side portions 13A and the non-skin-side portions 13B are separated by a fold line along which both side portions in the width direction x of the backsheet 13 are folded back, and the folded-back skin-side portion 13A is positioned on the skin-facing side of the non-skin-side portion 13B. At least a portion of the non-skin-side portion 13B is positioned overlapping the non-skin-facing side of the absorbent body 14.

[0018] It is preferable that at least a portion of the folded skin side portion 13A is arranged to overlap the skin-facing side of the absorbent body 14. This makes it easier to preferably exhibit the function of the first colored portion 21 provided on the folded skin side portion 13A, which will be described later. In the absorbent main body 11, the folded skin side portion 13A is provided on one side and the other side in the width direction x, and it is preferable that the folded skin side portion 13A on one side in the width direction x and the folded skin side portion 13A on the other side are arranged spaced apart from each other in the width direction x.

[0019] The folded-back skin-side portion 13A is preferably positioned so as to overlap a portion of the top sheet 12. The folded-back skin-side portion 13A may be positioned on either the skin-facing side or the non-skin-facing side of the top sheet 12. In Figure 4, the folded-back skin-side portion 13A is positioned on the non-skin-facing side of the top sheet 12. The folded-back skin-side portion 13A is preferably joined to the top sheet 12 at the overlapping portion with the top sheet 12.

[0020] It is preferable that the folded skin side portion 13A is joined to the skin side of the absorbent body 14. This allows the backsheet 13 to be stably held in a state in which it is provided from the non-skin side to the skin side of the absorbent body 14. It is preferable that the folded skin side portion 13A is joined to the absorbent body 14 at the overlapping portion with the absorbent body 14.

[0021] The length in the width direction x of the folded-back skin-side portion 13A is, for example, preferably 3% or more of the length in the width direction x of the absorbent main body 11 (specifically, the maximum length in the width direction x of the absorbent main body 11), more preferably 5% or more, even more preferably 8% or more, and preferably 25% or less, more preferably 20% or less. The length in the width direction x of the folded-back skin-side portion 13A is, for example, preferably 5 mm or more, more preferably 8 mm or more, even more preferably 10 mm or more, and preferably 60 mm or less, more preferably 50 mm or less, and even more preferably 40 mm or less. Note that the length in the width direction x of the folded-back skin-side portion 13A described here refers to the length in the width direction x of each folded-back skin-side portion 13A on one side or the other side of the absorbent main body 11 in the width direction x.

[0022] The absorbent body 14 is not particularly limited as long as it contains an absorbent material capable of absorbing urine and other bodily waste. For example, a molded body obtained by molding an absorbent material into a predetermined shape can be used as the absorbent body 14. The absorbent body 14 may be covered with a covering sheet such as a paper sheet (e.g., tissue paper or thin paper) or a liquid-permeable nonwoven fabric. Examples of the absorbent material include hydrophilic fibers such as pulp fibers, and water-absorbent resins such as polyacrylic acid, polyaspartic acid, cellulose, and starch-acrylonitrile. Furthermore, the water-absorbent material may include heat-fusible fibers such as polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers. These heat-fusible fibers may be hydrophilized with a surfactant or the like to enhance their affinity with urine and other wastes.

[0023] The absorbent material preferably contains hydrophilic fibers in order to increase the absorption rate of urine and the like. Furthermore, the absorbent material preferably contains a water-absorbent resin in order to increase the absorption capacity. Therefore, the absorber 14 preferably contains hydrophilic fibers (particularly pulp fibers) and a water-absorbent resin. In this case, it is preferable to use, for example, a collection of hydrophilic fibers to which a water-absorbent resin is mixed or dispersed.

[0024] The absorbent body 14 may be a sheet-like absorbent body that has a water-absorbent resin between nonwoven fabric sheets but does not have pulp fibers. The sheet-like absorbent body has a water-absorbent resin between the nonwoven fabric sheets, which allows it to achieve a high absorption capacity, and because it does not have pulp fibers between the nonwoven fabric sheets, it can be formed thin and not bulky.

[0025] The absorbent body 14 may be made up of multiple layers, for example, an upper absorbent body and a lower absorbent body.

[0026] There are no particular limitations on the shape (planar shape) of the absorbent body 14. Examples of the shape of the absorbent body 14 include a substantially rectangular, hourglass, gourd, and battledore shape. In the drawing, the absorbent body 14 is formed in a substantially hourglass shape.

[0027] The absorbent body 11 has rising flaps 15 on both sides of the skin-facing side in the width direction x. The rising flaps 15 can prevent lateral leakage of excrement such as urine. The rising flaps 15 can be made of a sheet material that can be used for the back sheet 13.

[0028] The rising flaps 15 are preferably provided with flap elastic members 16 extending in the front-to-rear direction y. The contractile force of the flap elastic members 16 makes it easier for the rising flaps 15 to stand up. The rising flaps 15 preferably have a base portion which serves as the starting point for standing up and a free end which serves as the tip of the standing up, and the flap elastic members 16 are preferably provided between the base portion and the free end. The base portion of the rising flaps 15 is preferably formed in a position overlapping with the folded-up skin side portion 13A of the backsheet 13.

[0029] 5, the rising flap 15 has a front end 15F, a rear end 15B and a flap intermediate portion 15M therebetween, and at least the flap intermediate portion 15M is provided with a flap elastic member 16 extending in the front-to-rear direction y, and it is preferable that the front end 15F and the rear end 15B are joined to the topsheet 12 or the backsheet 13, thereby forming the flap intermediate portion 15M in a standable manner. The front end 15F and the rear end 15B are preferably joined to the folded-back skin side portion 13A of the backsheet 13 directly or via the topsheet 12. The riseable portion of the rising flap 15 is the flap intermediate portion 15M, and the portion in front of the flap intermediate portion 15M that cannot stand is the front end 15F, and the portion in back of the flap intermediate portion 15M that cannot stand is the rear end 15B.

[0030] The absorbent main body 11 is disposed at least in the crotch region R on the skin-facing side of the outer covering member 31. It is preferable that the absorbent main body 11 further extends to the front waist region P and / or the rear waist region Q. The shape of the absorbent main body 11 is not particularly limited, and may be, for example, substantially rectangular or substantially hourglass-shaped.

[0031] A portion of the non-skin-facing side of the absorbent main body 11 (specifically, a portion of the backsheet 13) is fixed to the exterior member 31, and the portion of the absorbent main body 11 fixed to the exterior member 31 is referred to as the fixed portion 17. The absorbent main body 11 is fixed to at least the crotch region R of the exterior member 31, and may also be fixed to the front torso region P and / or the rear torso region Q. In Figures 3 and 4, the fixed portion 17 of the absorbent main body 11 is indicated by cross-hatching. The absorbent main body 11 is preferably fixed to the exterior member 31 with an adhesive.

[0032] Non-bonded sections 18 are formed at both ends in the width direction x of the absorbent main body 11, where the non-skin-facing side of the absorbent main body 11 is not fixed to the exterior member 31. The non-bonded sections 18 are formed in at least a part of both ends in the width direction x of the absorbent main body 11, and are preferably formed on both sides in the width direction x of the absorbent main body 11. The absorbent main body 11 preferably has fixed sections 17 between the non-bonded sections 18 on both sides in the width direction x. By forming the non-bonded sections 18 at both ends in the width direction x of the absorbent main body 11, the non-bonded sections 18 at both ends in the width direction x of the absorbent main body 11 tend to rise toward the skin-facing side as the rising flaps 15 rise, thereby improving the prevention of side leakage. Furthermore, when a separate auxiliary absorbent body is placed on the skin-facing side of the absorbent main body 11, the auxiliary absorbent body is supported from the outside in the width direction x by the non-bonded sections 18 rising toward the skin-facing side, making it easier to place the auxiliary absorbent body 11 stably on the skin-facing side of the absorbent main body 11.

[0033] Both ends of the absorbent main body 11 in the width direction x are defined as portions including the side edges on one or the other side of the absorbent main body 11 in the width direction x. The non-bonded portions 18 are formed with a predetermined length in the width direction x from the side edges of the absorbent main body 11 in the width direction x. The length of the non-bonded portions 18 in the width direction x is, for example, preferably 3% or more of the length of the absorbent main body 11 in the width direction x (specifically, the maximum length of the absorbent main body 11 in the width direction x), more preferably 5% or more, even more preferably 8% or more, and preferably 25% or less, and more preferably 20% or less. The length of the non-bonded portions 18 in the width direction x is, for example, preferably 5 mm or more, more preferably 8 mm or more, even more preferably 10 mm or more, and preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. Note that the length of the non-bonded portions 18 in the width direction x described here refers to the length of the non-bonded portions 18 on one or the other side of the absorbent main body 11 in the width direction x.

[0034] The non-joined portions 18 of the absorbent main body 11 are preferably formed so as to overlap the crotch region R of the outer sheath member 31. The length of the non-joined portions 18 in the front-to-rear direction y is, for example, preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more of the length of the absorbent main body 11 in the front-to-rear direction y. There is no particular upper limit to the length of the non-joined portions 18 in the front-to-rear direction y. However, from the viewpoint of stably fixing the front and rear ends of the absorbent main body 11 to the outer sheath member 31, the upper limit is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less of the length of the absorbent main body 11 in the front-to-rear direction y. Note that the lengths described in this specification are measured in the unfolded state of the disposable diaper 1, i.e., in the fully unfolded state with the elastic members removed or cut into small pieces so that the contractile force of the elastic members is not exerted.

[0035] The absorbent main body 11 has a first colored portion provided on the folded-back skin side portion 13A of the backsheet 13, and a second colored portion provided on the non-joint portion 18 of the non-skin side portion 13B of the backsheet 13. This will be described with reference to Figures 4, 6, and 7. Figure 6 shows a plan view of the portion of the absorbent main body 11 shown in Figure 5 that is composed of the top sheet 12, backsheet 13, and absorber 14, and has a first colored portion 21 provided on the folded-back skin side portion 13A of the backsheet 13, and a second colored portion 22 provided on the non-skin side portion 13B of the backsheet 13. Figure 7 shows a planar development of the backsheet 13 of the absorbent main body 11 shown in Figure 6, and shows design examples of the first colored portion 21 and the second colored portion 22 provided on the backsheet 13.

[0036] The absorbent main body 11 has the first colored portion 21 and the second colored portion 22 provided on the back sheet 13, so that both sides of the absorbent main body 11 in the width direction x on the skin-facing side and both sides of the absorbent main body 11 in the width direction x on the non-skin-facing side are colored by the first colored portion 21 and the second colored portion 22. This makes it easy to set a separate auxiliary absorbent body in an appropriate position on the skin-facing side of the absorbent main body 11.

[0037] By providing the first colored portion 21 on the skin-facing folded portion 13A of the backsheet 13, both side portions of the absorbent main body 11 in the width direction x can be easily seen when the disposable diaper 1 is viewed from the skin-facing side. This makes it easy to set the auxiliary absorbent body at an appropriate position on the skin-facing side of the absorbent main body 11 using the first colored portion 21 as a guide. For example, if a colored portion is provided on the rise flaps 15, when the rise flaps 15 are raised to set the auxiliary absorbent body between the rise flaps 15, the position of the colored portion on the rise flaps 15 will change, and the rise of the rise flaps 15 will reduce the visibility of the colored portion on the rise flaps 15. This makes it difficult for the colored portion to function as a guide for setting the auxiliary absorbent body. In contrast, if the first colored portion 21 is provided on the folded skin side portion 13A of the back sheet 13, the position of the first colored portion 21 does not change even when the rising flaps 15 are raised to set the auxiliary absorbent between them.In fact, when the rising flaps 15 are raised, the visibility of the first colored portion 21 increases, so the first colored portion 21 can be used to suitably function as a marker for setting the auxiliary absorbent.

[0038] By providing the second colored portion 22 in the non-jointed portion 18 of the non-skin side portion 13B of the backsheet 13, it is possible to easily confirm, using the second colored portion 22 as a marker, whether the auxiliary absorbent body is positioned between the rise flaps 15 on both sides in the width direction x, rather than being positioned so as to overlap the rise flaps 15. When the auxiliary absorbent body is positioned between the rise flaps 15, the rise of the rise flaps 15 also makes it easier for the non-jointed portion 18 of the absorbent main body 11 to rise toward the skin side. When the non-jointed portion 18 of the absorbent main body 11 rises toward the skin side, the second colored portion 22 provided in the non-jointed portion 18 becomes visible. Therefore, whether the second colored portion 22 is visible or not can be used to confirm that the auxiliary absorbent body is properly set between the rise flaps 15. On the other hand, when the auxiliary absorbent body is positioned so as to overlap the rise flaps 15, the rise of the rise flaps 15 is hindered, and the rise of the non-jointed portion 18 of the absorbent main body 11 toward the skin side is also suppressed. As a result, it becomes difficult to see the second colored portion 22, and it is determined that the auxiliary absorbent body is not properly set between the rising flaps 15. In this case, the auxiliary absorbent body is set again.

[0039] Since the first colored portion 21 and the second colored portion 22 are both provided on the back sheet 13, the first colored portion 21 and the second colored portion 22 can be easily provided by printing on the back sheet 13. The first colored portion 21 and the second colored portion 22 may be provided on the side of the back sheet 13 facing the absorbent body 14, or on the opposite side. Note that the first colored portion 21 and the second colored portion 22 are preferably provided on the side of the back sheet 13 opposite to the side facing the absorbent body 14, which can improve the visibility of the first colored portion 21 and the second colored portion 22. For printing, a conventionally known printing method such as gravure printing, flexographic printing, offset printing, inkjet printing, or screen printing can be used.

[0040] The first colored portion 21 may be provided only in a portion of the folded skin-side portion 13A of the backsheet 13, or may be provided over the entire folded skin-side portion 13A of the backsheet 13. The second colored portion 22 may be provided only in a portion of the non-jointed portion 18 of the non-skin-side portion 13B of the backsheet 13, or may be provided over the entire non-jointed portion 18 of the non-skin-side portion 13B of the backsheet 13. When the first colored portion 21 is provided only in a portion of the folded skin-side portion 13A of the backsheet 13, and when the second colored portion 22 is provided only in a portion of the non-jointed portion 18 of the non-skin-side portion 13B of the backsheet 13, the first colored portion 21 and the second colored portion 22 can be displayed as a design. Examples of the design include patterns and figures. In Figures 6 and 7, the first colored portion 21 is composed of multiple triangles, and the second colored portion 22 is composed of multiple linear portions extending in the front-to-rear direction y.

[0041] The non-skin side portion 13B of the backsheet 13 may also be provided with colored portions in areas other than the non-jointed portion 18. Note that the non-skin side portion 13B of the backsheet 13 does not need to be provided with colored portions because visibility is not particularly required in areas other than the non-jointed portion 18. Alternatively, it is preferable that the area ratio of the colored portions in areas other than the non-jointed portion 18 of the non-skin side portion 13B is smaller than the area ratio of the second colored portions 22 in the non-jointed portion 18 of the non-skin side portion 13B.

[0042] The first colored portion 21 is preferably colored a different color from the top sheet 12 and the rising flaps 15, and the second colored portion 22 is preferably colored a different color from the exterior member 31. More preferably, the first colored portion 21 and the second colored portion 22 are colored a different color from the top sheet 12, the rising flaps 15, and the exterior member 31. Because the top sheet 12, the rising flaps 15, and the exterior member 31 are usually formed in white, it is preferable that the first colored portion 21 and the second colored portion 22 be colored a color other than white. This can improve the visibility of the first colored portion 21 and the second colored portion 22.

[0043] The colors of the first colored portion 21 and the second colored portion 22 other than white include red, orange, yellow, yellow-green, green, blue, purple, black, gray, etc., and a chromatic color is preferable. The colors of the first colored portion 21 and the second colored portion 22 may be fluorescent colors. In order to improve the visibility of the first colored portion 21 and the second colored portion 22, the first colored portion 21 and the second colored portion 22 are preferably L * a * b * It is preferable that the color has a hue angle h of 30° or more and 300° or less in the color system. In this case, the first colored portion 21 and the second colored portion 22 are colored with a hue centered on orange to purple blue. The hue angle h is more preferably 60° or more, even more preferably 90° or more, and even more preferably 120° or more, and is preferably 285° or less, and even more preferably 270° or less. The hue angle h is determined by the L * a * b * Color space a * and b * From the value of h, it can be calculated using the following formula: h = tan -1 [(b * ) / (a * )]. L * a * b * Color representation by color system (L * , a * , b * ) can be measured, for example, by a fluorescence spectrodensitometer FD-7 manufactured by Konica Minolta.

[0044] From the viewpoint of facilitating visual distinction between the first colored portion 21 and the second colored portion 22, the first colored portion 21 may be colored in a color different from that of the second colored portion 22. The hue angle difference Δh between the first colored portion 21 and the second colored portion 22 is, for example, preferably 30° or more, more preferably 45° or more, and even more preferably 60° or more.

[0045] The first colored portion 21 and the second colored portion 22 may be colored in colors whose hue angles h are close to each other, and for example, the hue angle difference Δh between the first colored portion 21 and the second colored portion 22 may be less than 30°, or may be 20° or less, 10° or less, or 5° or less. In this case, it is easy to create a unified design for the first colored portion 21 and the second colored portion 22.

[0046] The first colored portion 21 and the second colored portion 22 may have different saturations and / or brightnesses. In this case, even if the dye angle difference Δh between the first colored portion 21 and the second colored portion 22 is small, the first colored portion 21 and the second colored portion 22 can be easily distinguished visually.

[0047] For example, the saturation of the first colored portion 21 may be higher than the saturation of the second colored portion 22. Alternatively, the brightness of the first colored portion 21 may be lower than the brightness of the second colored portion 22. When the first colored portion 21 and the second colored portion 22 are formed in this manner, the first colored portion 21 is more easily visible than the second colored portion 22. In this case, even if the rising flap 15 overlaps with the first colored portion 21 in a collapsed state, the first colored portion 21 is more easily visible through the rising flap 15. Therefore, when placing an auxiliary absorbent body on the skin-facing side of the disposable diaper 1, it becomes easy to set the auxiliary absorbent body in an appropriate position on the skin-facing side of the absorbent main body 11 using the first colored portion 21 as a guide.

[0048] On the other hand, the saturation of the second colored portion 22 may be higher than that of the first colored portion 21. Alternatively, the brightness of the second colored portion 22 may be lower than that of the first colored portion 21. The second colored portion 22 is provided in the non-joint portion 18 of the non-skin side portion 13B of the backsheet 13, and is provided in a location that is less visible than the first colored portion 21. However, if the first colored portion 21 and the second colored portion 22 are formed in this manner, the visibility of the second colored portion 22 is improved, making it easier to determine whether the non-joint portion 18 of the absorbent main body 11 has risen to the skin side as the rise flaps 15 rise. Therefore, whether the auxiliary absorbent body is properly set between the rise flaps 15 can be easily confirmed by checking whether the second colored portion 22 is visible.

[0049] From the viewpoint of facilitating visual distinction between the first colored portion 21 and the second colored portion 22, the color difference ΔE between the first colored portion 21 and the second colored portion 22 is preferably 20 or more, more preferably 30 or more, and even more preferably 40 or more. * L * a * b * Color space a * and b * can be calculated from the value of ΔE * =[(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 ] 1 / 2 .

[0050] In order to enhance the visibility of the first colored portion 21 and the second colored portion 22, the saturation C * is, for example, preferably 20 or more, more preferably 30 or more, and even more preferably 40 or more. * L * a * b * Color space a * and b * From the value of C, it can be calculated using the following formula: * =[(a * ) 2 +(b * ) 2 ] 1 / 2 The lightness L of the first colored portion 21 and the second colored portion 22 * The range that can be taken by the color may vary depending on the hue, and it is difficult to determine a suitable range in general. However, for example, the color may be preferably 20 or more, more preferably 30 or more, even more preferably 40 or more, and may be preferably 80 or less, more preferably 75 or less, and even more preferably 70 or less.

[0051] The first colored portion 21 and the second colored portion 22 may be provided with different designs, and are provided in this manner in Figures 6 and 7. The first colored portion 21 and the second colored portion 22 may be provided with different area ratios. Providing the first colored portion 21 and the second colored portion 22 in this manner also makes it easy to visually distinguish between the first colored portion 21 and the second colored portion 22.

[0052] 8 and 9 show other design examples of the first colored portion 21 and the second colored portion 22 provided on the backsheet 13. However, as shown in FIG. 8, the first colored portion 21 and the second colored portion 22 may be provided such that the area ratio of the first colored portion 21 in the folded-back skin-side portion 13A is larger than the area ratio of the second colored portion 22 in the non-joined portion 18 of the non-skin-side portion 13B. When the first colored portion 21 and the second colored portion 22 are provided in this manner, the first colored portion 21 is more visible than the second colored portion 22. In this case, even when the rising flap 15 overlaps with the first colored portion 21 in a collapsed state, the first colored portion 21 is easily visible through the rising flap 15. Therefore, when placing an auxiliary absorbent body on the skin-facing side of the disposable diaper 1, it is easy to set the auxiliary absorbent body in an appropriate position on the skin-facing side of the absorbent main body 11 using the first colored portion 21 as a guide.

[0053] 9, the first colored portion 21 and the second colored portion 22 may be provided so that the area ratio of the second colored portion 22 in the non-joined portion 18 of the non-skin side portion 13B is larger than the area ratio of the first colored portion 21 in the folded-back skin side portion 13A. If the first colored portion 21 and the second colored portion 22 are provided in this manner, the visibility of the second colored portion 22 is improved, making it easier to determine whether the non-joined portion 18 of the absorbent main body 11 has risen to the skin side as the rise flaps 15 rise. Therefore, whether the auxiliary absorbent body is properly set between the rise flaps 15 can be easily confirmed by whether the second colored portion 22 is visible.

[0054] The area proportion of the first colored portion 21 in the folded skin-side portion 13A is calculated by dividing the area of ​​the first colored portion 21 in the folded skin-side portion 13A by the area of ​​the folded skin-side portion 13A. The area proportion of the second colored portion 22 in the non-joined portion 18 of the non-skin-side portion 13B is calculated by dividing the area of ​​the second colored portion 22 in the non-joined portion 18 of the non-skin-side portion 13B by the area of ​​the non-joined portion 18 of the non-skin-side portion 13B. To improve the visibility of the first colored portion 21 and the second colored portion 22, the area proportion of the first colored portion 21 in the folded skin-side portion 13A and the area proportion of the second colored portion 22 in the non-joined portion 18 of the non-skin-side portion 13B is preferably 10% or more, more preferably 20% or more, and even more preferably 25% or more.

[0055] The first colored portion 21 of the folded-back skin side portion 13A is preferably provided so as to overlap the flap intermediate portion 15M at which the rise flap 15 can rise (see FIGS. 4 to 6). Specifically, the first colored portion 21 of the folded-back skin side portion 13A is preferably provided so as to overlap the flap intermediate portion 15M when the rise flap 15 is in a collapsed state. By providing the first colored portion 21 in this manner, after the rise flap 15 is raised to set the auxiliary absorbent body between the rise flaps 15, it becomes easy to properly set the auxiliary absorbent body between the rise flaps 15 using the first colored portion 21 as a guide.

[0056] In the flap intermediate portion 15M, the first colored portion 21 of the folded-back skin side portion 13A is preferably provided so as to overlap the flap intermediate portion 15M of the rising flap 15 and also overlap the base of the rising flap 15. By providing the first colored portion 21 in this manner, it becomes easy to visually determine the area between the rising flaps 15 on the skin-facing side of the absorbent main body 11 where the auxiliary absorbent body can be placed, and it becomes easy to properly set the auxiliary absorbent body between the rising flaps 15 using the first colored portion 21 as a landmark.

[0057] It is also preferable that the first colored portion 21 of the folded-back skin-side portion 13A overlap with the front end 15F and / or the rear end 15B. In this case, the first colored portion 21 of the folded-back skin-side portion 13A is easily visible through the front end 15F and / or the rear end 15B of the rise flap 15 before the rise flap 15 is raised. Therefore, when setting the auxiliary absorbent body on the skin-facing side of the absorbent main body 11, it is easy to properly determine the position where the auxiliary absorbent body will be set before the rise flap 15 is raised. After roughly determining the position where the auxiliary absorbent body will be set, the rise flap 15 can be raised and the auxiliary absorbent body can be set in the appropriate position between the rise flaps 15. It is more preferable that the first colored portion 21 of the folded-back skin-side portion 13A overlap with both the front end 15F and the rear end 15B, and even more preferably with the flap middle portion 15M.

[0058] The absorbent body 14 has a front portion 14F, a rear portion 14B and a middle portion 14M therebetween, the front portion 14F and the rear portion 14B being formed wider than the middle portion 14M, the backsheet 13 being folded back along both side edges in the width direction x of the front portion 14F and the rear portion 14B of the absorbent body 14, and it is preferable that margin portions 19 are formed in which the non-skin-side portion 13B and the folded-back skin-side portion 13A of the backsheet 13 are overlapped without the absorbent body 14 in between, outward in the width direction x from both side edges in the width direction x of the middle portion 14M of the absorbent body 14. By forming the margin portions 19 in this way, it becomes easier to grasp the position of the middle portion 14M of the absorbent body 14 in the front-to-rear direction y. In the margin portion 19, the non-skin side portion 13B and the folded-back skin side portion 13A of the backsheet 13 are overlapped, so that the second colored portion 22 of the non-skin side portion 13B and the first colored portion 21 of the folded-back skin side portion 13A are visible in the margin portion 19, making it easy to grasp the position of the middle portion 14M of the absorbent body 14. This makes it easy to arrange the auxiliary absorbent body overlapping the absorbent body 14 so that it is in an appropriate position in the front-to-back direction y of the absorbent body 14.

[0059] The structure of the outer covering member 31 will now be described. The outer covering member 31 may be composed of only one layer or multiple layers. In the disposable diaper 1 shown in the drawings, the outer covering member 31 is formed in a pants-like shape having a waist opening 32 and a pair of leg openings 33. In a disposable diaper 1 formed in this manner, the visibility of the absorbent main body 11 tends to be reduced compared to an open-type disposable diaper, making it difficult to properly set the auxiliary absorbent body on the skin-facing side of the absorbent main body 11. For this reason, the disposable diaper of the present invention is particularly preferably applicable to pants-type disposable diapers. Preferred embodiments of the outer covering member 31 for pants-type disposable diapers 1 will now be described.

[0060] 1 to 4, the exterior member 31 preferably has an outer sheet 35 arranged on the non-skin-facing side and an inner sheet 36 arranged on the skin-facing side. The exterior member 31 or the outer sheet 35 and inner sheet 36 are preferably liquid-impermeable, so that even if urine or the like leaks from the absorbent body 11, the urine or the like can be prevented from passing through the exterior member 31 and leaking to the outside. For the exterior member 31 or the outer sheet 35 and inner sheet 36, for example, a sheet material that can be used for the back sheet 13 can be used.

[0061] The front torso region P and the back torso region Q of the outer cover member 31 are preferably provided with a plurality of torso elastic members 37 extending in the width direction x. The torso elastic members 37 are provided between the waist opening 32 and the leg openings 33. The torso elastic members 37 improve the fit around the wearer's waist. Among the torso elastic members 37, elastic members provided at narrow intervals in the front-to-back direction y along the edge of the waist opening 32 may be provided as waist elastic members 38, thereby forming waist gathers that conform to the wearer's waist and preventing leakage of urine and other bodily waste from the back or abdomen. In Figures 1 to 3, the waist elastic members 38 are provided at narrower intervals in the front-to-back direction y than the torso elastic members 37.

[0062] The outer cover 31 preferably has leg elastic members 39 provided along the edges of the leg openings 33. This is particularly preferred when the disposable diaper of the present invention is a pants-type diaper. In the drawings, the leg elastic members 39 are composed of front leg elastic members 39F provided along the front edge of the leg openings 33 and rear leg elastic members 39B provided along the rear edge of the leg openings 33. The front leg elastic members 39F and rear leg elastic members 39B form elastic members along almost the entire periphery of the edge of the leg openings 33. The leg elastic members 39 form leg gathers that fit around the wearer's legs, preventing leakage of urine and the like from the crotch region R. Although the front leg elastic members 39F and rear leg elastic members 39B are shown spaced apart from each other in the drawings, the front leg elastic members 39F and rear leg elastic members 39B may be in contact with or intersect each other.

[0063] The front leg elastic members 39F and the rear leg elastic members 39B are preferably provided intermittently in the portion crossing the crotch region R in the width direction x. In other portions, the front leg elastic members 39F and the rear leg elastic members 39B are preferably provided continuously. Providing the front leg elastic members 39F and the rear leg elastic members 39B in this manner makes the absorbent main body 11 less susceptible to distortion, improving the fit of the absorbent main body 11 around the wearer's crotch. When the leg elastic members 39 are provided intermittently, they can be cut with a cutter or the like after adhesively fixing the leg elastic members 39 to the outer cover member 31. This allows the leg elastic members 39 to be provided intermittently easily during manufacturing, and also allows the contractile force of the elastic members to be substantially lost in the portions where the leg elastic members 39 are provided intermittently.

[0064] When the outer covering member 31 is composed of an outer sheet 35 and an inner sheet 36 as shown in the drawing, the torso elastic member 37, the waist elastic member 38, and the leg elastic member 39 provided on the outer covering member 31 are preferably arranged between the outer sheet 35 and the inner sheet 36.

[0065] The elastic members provided in the disposable diaper can be made of elastic and stretchable materials commonly used in ordinary disposable diapers, such as polyurethane yarn, polyurethane film, and natural rubber. Each elastic member is preferably secured to the diaper in a stretched state, and is preferably secured with an adhesive such as a hot-melt adhesive. For example, polyurethane yarn having a fineness of 40 to 1,240 dtex is stretched at a stretch ratio of 1.1 to 5.0, and then secured. A rubber-based hot-melt adhesive is preferably used as the adhesive. The stretch ratio is defined as 1.0 in the unstretched state.

[0066] The above has described the disposable diaper of the present invention as being applied to a pants-type diaper, but the disposable diaper of the present invention may also be an open-type (tape-type) disposable diaper in which fastening members are provided on both sides of the width of the rear waist portion, and the fastening members form the diaper into a pants-like shape when worn. [Explanation of symbols]

[0067] 1: Disposable diapers 11: Absorbent body 12: Top sheet 13: Back sheet, 13A: Folded skin side portion, 13B: Non-skin side portion 14: absorbent body, 14F: front part, 14M: middle part, 14B: rear part 15: Rising flap, 15F: Front end, 15M: Flap middle part, 15B: Rear end 16: Flap elastic member 17: Fixed part 18: Non-joint part 19: Margin 21: 1st coloring section 22: 2nd coloring section 31: Exterior material 32: Waist opening 33: Leg opening 34: Side joint 35: Outer sheet 36: Inner seat 37: Elastic body member 38: Waist elastic member 39: Leg elastic member, 39F: Front leg elastic member, 39B: Rear leg elastic member P: Front body Q: Rear torso R: Crotch

Claims

1. A disposable diaper comprising an outer cover member having a front-rear direction and a width direction, a front waist portion, a rear waist portion and a crotch portion located therebetween, and an absorbent main body disposed on the skin-facing side of the outer cover member and fixed to the crotch portion, The absorbent main body has an absorbent body, a top sheet arranged on the skin-facing side of the absorbent body, and a back sheet arranged on the non-skin-facing side of the absorbent body, and is provided with rising flaps on both sides in the width direction of the skin-facing side, the backsheet has folded-back skin-side portions in which both widthwise side portions are folded back to the skin-facing side of the absorbent body, and non-skin-side portions formed from the portions between the folded-back skin-side portions and positioned on the non-skin-facing side of the absorbent body, The absorbent main body has non-joined portions at both ends in the width direction, where the non-skin-facing side of the absorbent main body is not fixed to the exterior member, The disposable diaper has a first colored portion provided on the folded-back skin-side portion of the backsheet, and a second colored portion provided on the non-joined portion of the non-skin-side portion of the backsheet.

2. The disposable diaper according to claim 1, wherein an area ratio of the first colored portion in the folded-back skin-side portion is greater than an area ratio of the second colored portion in the non-joined portion of the non-skin-side portion.

3. The disposable diaper according to claim 1, wherein an area ratio of the second colored portion in the non-joined portion of the non-skin-side portion is greater than an area ratio of the first colored portion in the folded-back skin-side portion.

4. The disposable diaper according to claim 1, wherein the saturation of the first colored portion is higher than the saturation of the second colored portion, and / or the brightness of the first colored portion is lower than the brightness of the second colored portion.

5. The disposable diaper according to claim 1, wherein the saturation of the second colored portion is higher than the saturation of the first colored portion, and / or the brightness of the second colored portion is lower than the brightness of the first colored portion.

6. 2. The disposable diaper according to claim 1, wherein the first colored portion is colored a different color from the second colored portion.

7. the rising flap has a front end, a rear end and a flap intermediate portion therebetween, the front end and the rear end being joined to the folded-back skin side portion directly or via the top sheet, and the flap intermediate portion being formed to be able to rise, The disposable diaper according to claim 1, wherein the first colored portion of the folded-back skin-side portion is provided so as to overlap the flap intermediate portion.

8. The disposable diaper according to claim 7, wherein the first colored portion of the folded-back skin-side portion of the flap intermediate portion is provided so as to overlap a base portion of the rising flap.

9. the rising flap has a front end, a rear end and a flap intermediate portion therebetween, the front end and the rear end being joined to the folded-back skin side portion directly or via the top sheet, and the flap intermediate portion being formed to be able to rise, The disposable diaper according to claim 1, wherein the first colored portion of the folded-back skin-side portion is provided so as to overlap the front end portion and / or the rear end portion.

10. the absorbent body has a front side portion, a rear side portion and an intermediate portion therebetween, the front side portion and the rear side portion being formed wider than the intermediate portion, 2. The disposable diaper according to claim 1, wherein the back sheet is folded back along both widthwise edges of the front and rear portions of the absorbent body, and a margin portion is formed widthwise outward of both widthwise edges of the middle portion, in which the non-skin side portion of the back sheet and the folded-back skin side portion are overlapped without the absorbent body in between.

11. 2. The disposable diaper according to claim 1, wherein the outer cover member is formed in a pants shape having a waist opening and a pair of leg openings.

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