Disposable diapers

Abstract

To provide a disposable diaper that is easy to attach to the correct position on the body. [Solution] On the dorsal side R, waist position marks 9 and umbilical position marks 10 are visibly positioned on the skin-facing surface of the diaper 1, outside the side edges 50S, 50S of the absorbent core 50 or their extensions in the lateral direction Y. The waist position marks 9 extend in the vertical direction X and are arranged in multiple pairs at symmetrical positions with respect to the lateral center line Cly of the diaper 1. The umbilical position marks 10 are arranged in pairs at symmetrical positions with respect to the lateral center line Cly and intersect with the waist position marks 9.

Description

Technical Field

[0001] The present invention relates to an open-type disposable diaper having fastening tapes for wearing.

Background Art

[0002] Disposable diapers are classified into open-type ones and pant-type ones. Open-type diapers are particularly suitable for wearers who spend a relatively large amount of time in a lying posture, and are useful, for example, when the wearer is an infant or toddler. A general open-type diaper includes a crotch portion disposed at the crotch of a wearer, a ventral portion disposed on the ventral side of the wearer relative to the crotch portion, a dorsal portion disposed on the dorsal side of the wearer relative to the crotch portion, and a pair of fastening tapes provided on the dorsal portion. When a third party (a wearing assistant) puts on a diaper having such a configuration for a person to be worn, the person to be worn is usually laid on their back on the inner surface (skin-facing surface) of the dorsal portion of the spread diaper, the part of the diaper extending from the crotch portion to the ventral portion is pulled up to the ventral side through the crotch of the person to be worn, the pair of fastening tapes is extended to the ventral side of the person to be worn, and the distal ends thereof are fastened to the outer surface (non-skin-facing surface) of the ventral portion.

[0003] In order to exert the functions of the disposable diaper and obtain a predetermined effect, it is important to 1) select a diaper that matches the body shape of the person to be worn, and 2) put on the diaper at an appropriate position on the body of the person to be worn. Regarding the above 1), for example, if the diaper is too large or too small relative to the applicable size of the person to be worn, the leakage prevention function of the diaper cannot be sufficiently exerted, and there is a risk that the excrement of the wearer leaks out of the diaper. Regarding the above 2), for example, when a wearing assistant puts an open-type diaper on a person to be worn according to the above procedure, if the position where the person to be worn is laid on the diaper is not appropriate, the fit of the diaper to the body is reduced, which causes leakage of excrement such as urine.

[0004] In relation to the above 2), disposable diapers having markings for positioning during application have been proposed. For example, Patent Document 1 discloses a diaper with a mark on the skin-facing side that guides the wearer's buttock position. Patent Document 2 discloses a diaper with a mark on the skin-facing side that guides the wearer's back position. Patent Document 3 discloses a diaper that can encourage an assistant to perform the application at the appropriate timing by having a skin-facing marking portion located on the skin-facing side and a non-skin-facing marking portion located on the non-skin-facing side. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] International Publication No. 2024 / 005031 [Patent Document 2] Japanese Patent Publication No. 2023-182379 [Patent Document 3] Japanese Patent Publication No. 2020-116453 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Although the diapers described in Patent Documents 1 and 2 have markings for positioning during application, these markings are located in the center of the diaper in the lateral direction (a direction perpendicular to the wearer's front-to-back direction). Therefore, when an assistant applies the diaper to a person to be worn, if the person is laid down on the unfolded diaper, the markings become hidden by the wearer's body and are not visible to the assistant, making positioning difficult.

[0007] Furthermore, for a diaper to be properly fitted to the wearer's body, it is necessary that the diaper fits the wearer's body shape. Commercially available diapers are often sized according to the wearer's weight, and in that case, if the wearer's weight is within the weight range recommended by the diaper, the diaper should fit the wearer's body shape. However, in reality, the diaper may not fit the wearer's body shape when worn. This inconvenience is due to the fact that even people with the same weight can have different body shapes, such as the degree of abdominal bulge. This inconvenience is particularly common in infants and toddlers, as individual differences in body shape are relatively large. Diapers that address this inconvenience are not yet available.

[0008] The object of the present invention is to provide a deployable disposable diaper that is easy to attach to the appropriate position on the body. [Means for solving the problem]

[0009] The present invention has a longitudinal direction extending from the wearer's abdominal side through the crotch area to the back, and a transverse direction perpendicular to the longitudinal direction, and is divided into an inseam section located in the crotch area, an abdominal section located on the wearer's abdominal side than the inseam section, and a dorsal section located on the wearer's back side than the inseam section. This disposable diaper has an absorbent core that absorbs and retains bodily fluids, and a pair of fastening tapes provided on both sides of the dorsal portion along the longitudinal direction, which are fastened to the fastening area on the ventral portion when in use. In one embodiment of the disposable diaper of the present invention, on the dorsal side, markings including a waist position mark and a navel position mark are visibly arranged on the skin-facing surface of the diaper, beyond the side edges or extensions thereof that align with the longitudinal direction of the absorbent core. In one embodiment of the disposable diaper of the present invention, the waist position marks extend in the vertical direction and are arranged in multiple pairs at symmetrical positions with respect to a horizontal center line that divides the diaper in the horizontal direction and extends in the vertical direction. In one embodiment of the disposable diaper of the present invention, the navel position marks are arranged in pairs at symmetrical positions with respect to the horizontal center line and intersect with the waist position marks.

[0010] The present invention also relates to a disposable diaper package comprising the disposable diaper described above and a packaging container for housing the diaper, wherein the packaging container contains information relating to the waist position mark 9 and the navel position mark 10. Other features, effects, and embodiments of the present invention are described below. [Effects of the Invention]

[0011] According to the present invention, a deployable disposable diaper is provided that is easy to attach to the appropriate position on the body. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a schematic unfolded plan view showing the skin-facing side (surface sheet side) of one embodiment of the unfolded and fully extended state of the unfolded disposable diaper of the present invention. [Figure 2] Figure 2 is a schematic cross-sectional view of the line II section of Figure 1 (a cross-section along the transverse and thickness directions of the disposable diaper). [Figure 3] Figure 3 is a schematic enlarged plan view showing the waist position mark, navel position mark, and surrounding area on one side of the diaper shown in Figure 1. [Figure 4] Figure 4 is a schematic diagram illustrating how to put on the diaper shown in Figure 1. [Figure 5] Figure 5 is a schematic plan view of the diaper fastening area shown in Figure 1. [Modes for carrying out the invention]

[0013] The present invention will be described below with reference to the drawings, based on its preferred embodiments. In the following drawings, identical or similar parts are denoted by the same or similar reference numerals. The drawings are basically schematic, and the proportions of the dimensions may differ from those of reality.

[0014] FIGS. 1 to 5 show a diaper 1 as an embodiment of the spread-type disposable diaper of the present invention, or a part thereof. The diaper 1 has a longitudinal direction X corresponding to the front-rear direction of a wearer, that is, the direction extending from the ventral side through the crotch portion to the dorsal side, and a lateral direction Y orthogonal to the longitudinal direction X. The diaper 1 also has a crotch portion M which is disposed at the crotch part of the wearer and includes an excretory part opposing portion (not shown) opposing an excretory part such as the penis, a ventral portion F disposed on the wearer's ventral side (front side) relative to the crotch portion M, and a dorsal portion R disposed on the wearer's dorsal side (rear side) relative to the crotch portion M.

[0015] In the present embodiment, the diaper 1 is formed symmetrically on one side and the other side across the lateral center line CLy in the spread and maximum stretched state. The ventral portion F is a part of the front body of the diaper 1, and the dorsal portion R is a part of the back body of the diaper 1. The crotch portion M spans the longitudinal center line CLx in the longitudinal direction X, and exists in both the front body and the back body of the diaper 1. In the present invention, the ventral portion F, the crotch portion M, and the dorsal portion R can be respective regions obtained by trisecting the diaper 1 in the spread and maximum stretched state in the longitudinal direction X. The lateral center line CLy is an imaginary straight line that bisects the diaper 1 in the spread and maximum stretched state in the lateral direction Y and extends in the longitudinal direction X. The longitudinal center line CLx is an imaginary straight line that bisects the diaper 1 in the spread and maximum stretched state in the longitudinal direction X and extends in the lateral direction Y.

[0016] In the present specification, the "spread and maximum stretched state" refers to a state in which the object (absorbent article or the like) is spread flat to be in a spread state, and the elastic members of each part of the object in the spread state are maximally stretched, so that the object is spread to the design dimension, that is, the dimension when spread flat in a state where the influence of the elastic members is completely eliminated.

[0017] The diaper 1 has an absorbent core 50 that absorbs and retains body fluid such as urine, and a pair of fastening tapes 21, 21 that are provided on both side portions along the longitudinal direction X of the dorsal portion R and are fastened to the fastening region 22 of the ventral portion F during use.

[0018] In this embodiment, the diaper 1 has an absorbent body 2, and the absorbent body 2 has an absorbent core 50. More specifically, as shown in Figure 2, the absorbent body 2 has a surface sheet 3 disposed on the skin-facing side of the absorbent body 5 and a back sheet 4 disposed on the non-skin-facing side of the absorbent body 5, and the absorbent body 5 has an absorbent core 50 and a core wrap sheet 51 that covers the outer surface (skin-facing side and non-skin-facing side) of the absorbent core 50. The components constituting the absorbent body 2 and the components of the absorbent body 5 are joined together by bonding means such as adhesives. An outer sheet 6 is disposed on the non-skin-facing side of the absorbent body 2 (back sheet 4), and the two are joined together by bonding means such as adhesives. The absorbent body 2 extends in the longitudinal direction X from the ventral side F to the dorsal side R, and its longitudinal direction coincides with the longitudinal direction X. The surface sheet 3, together with the cuff sheet 70 described later, forms the skin-facing surface (inner surface) of the diaper 1, while the outer sheet 6 forms the non-skin-facing surface (outer surface) of the diaper 1.

[0019] In this specification, "skin-facing surface" refers to the surface of an absorbent article or its component (e.g., an absorbent material) that faces the wearer's skin when the absorbent article is worn, i.e., the side that is relatively closer to the wearer's skin, and "non-skin-facing surface" refers to the surface of an absorbent article or its component that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively further away from the wearer's skin. "When worn" here means the normal, proper wearing position, i.e., the state in which the correct wearing position of the absorbent article is maintained.

[0020] In this embodiment, the diaper 1 has a pair of leak-proof cuffs 7, 7 arranged along both sides of the absorbent body 2 in the longitudinal direction X. Each leak-proof cuff 7 includes a liquid-impermeable and breathable cuff sheet 70. One end of the cuff sheet 70 in the transverse direction Y is fixed to another member (the back sheet 4 in the configuration shown in Figure 2) and serves as a fixed end, while the other end of the cuff sheet 70 in the transverse direction Y is a free end not fixed to another member. An elastic cuff member 71 is positioned at the free end of the cuff sheet 70 so as to be expandable and contractible in the longitudinal direction X, and fixed in an extended state in the longitudinal direction X. When the diaper 1 is worn, the contraction force of the elastic member 71 causes the free end of the cuff sheet 70 to stand up towards the wearer, at least in the crotch area M, with the fixed end as the base for standing, thereby preventing the outward leakage of excrement such as urine in the transverse direction Y. Note that in Figure 2, for the sake of explanation, the leak-proof cuff 7 is shown in an upright position. However, in the unfolded and fully extended state of the diaper 1 as shown in Figure 1, the leak-proof cuff 7 does not necessarily stand upright as shown in Figure 2.

[0021] In this embodiment, the diaper 1 includes a flap portion located outside the periphery of the absorbent core 50. The flap portion is composed of a member arranged to straddle the periphery of the absorbent core 50, and in this embodiment, includes one or more selected from a surface sheet 3, a back sheet 4, an outer sheet 6, and a cuff sheet 70. In the flap portion, the portion located outward in the lateral direction Y from both side edges 50S, 50S along the longitudinal direction X of the absorbent core 50 and the imaginary extension lines of each side edge 50S is the side flap portion 20. The side flap portion 20 extends along the entire length of the diaper 1 in the longitudinal direction X. In this embodiment, as shown in Figure 1, the side flap portion 20 has a constricted portion in the central area in the vertical direction X (the area located in the crotch area M). This constricted portion is the part of the diaper 1 that is positioned around the wearer's legs (leg area), and the leg area elastic member 8 is arranged to be expandable and contractible in the vertical direction X.

[0022] In this embodiment, the skin-facing surface (inner surface) of the diaper 1 is formed by the surface sheet 3 and the cuff sheet 70, and the non-skin-facing surface (outer surface) of the diaper 1 is formed by the outer sheet 6.

[0023] The diaper 1 of this embodiment is a so-called unfoldable disposable diaper. As a configuration unique to such a diaper, as shown in Figure 1, the diaper 1 has fastening tapes 21 with fastening portions 21A on both side edges along the longitudinal direction X of the back portion R, and a sheet (outer sheet 6 in this embodiment) that forms the non-skin-facing surface of the ventral portion F of the diaper 1 has a fastening region 22 to which the fastening portion 21A can be fastened. The fastening portion 21A is detachably attached to the fastening region 22. The configuration of the fastening region 22 is not particularly limited, provided that the fastening portion 21A can be fastened to it, and may be made of the sheet that forms the non-skin-facing surface of the ventral portion F of the diaper 1, or it may be made of a different material from the sheet. An example of the latter is a form in which the fastening region 22 is made of the female member of a mechanical hook-and-loop fastener. The female member has a base sheet, and the fastening portion can be fastened to one side of the base sheet. When the fastening region 22 is made up of the female member, it is preferable that the fastening portion 21A is made up of the male member of the mechanical hook-and-loop fastener.

[0024] As for the components of the diaper 1 mentioned above, those commonly used in this type of absorbent article can be used without any particular limitations. Various types of liquid-permeable sheets can be used as the surface sheet 3, such as nonwoven fabrics, woven fabrics, and paper. The surface sheet 3 is typically hydrophilic. The backing sheet 4 and the cuff sheet 70 can be sheets with leak-proof properties, specifically sheets that are impermeable to liquids (not allowing any liquid to pass through) or have low liquid permeability (not completely impermeable to liquids, but difficult for liquids to pass through). Examples include a moisture-permeable resin film and a laminate of the resin film and a nonwoven fabric. The backing sheet 4 is typically hydrophobic. The absorbent core 50 mainly consists of a water-absorbing material, and the water-absorbing material is preferably one or more selected from fibrous materials such as wood pulp and water-absorbing polymers. The absorbent core 50 may be, for example, a laminated fiber type mainly consisting of an aggregate of fibrous materials, with water-absorbing polymer particles supported on the aggregate as needed, or a sheet type in which water-absorbing polymer particles are fixed inside or on the surface of a fibrous sheet. The sheet type is thinner and more flexible than the laminated fiber type. The core wrap sheet 51 is permeable to liquids and is typically made of paper, nonwoven fabric, etc. The absorbent body 5 may not include the core wrap sheet 51 and consist only of the absorbent core 50. For the outer sheet 6, a material with a pleasant texture is preferred, and from this viewpoint, various nonwoven fabrics are preferably used. The outer sheet 6 is optional.

[0025] Diaper 1 has markings that are useful for an assistant (third party) who is putting diaper 1 on the person to be worn. Specifically, as shown in Figures 1 and 3, on the dorsal side R of diaper 1, markings including a waist position mark 9 and a navel position mark 10 are visibly placed on the skin-facing surface (inner surface) of diaper 1, laterally Y outward from both side edges 50S, 50S of the absorbent core 50 or their extensions. These markings are intended to guide the proper placement of diaper 1 and are visibly placed on the skin-facing surface of diaper 1.

[0026] The waist position marks 9 indicate the position of the wearer's waist in the vertical direction X when the diaper 1 is properly fitted. As shown in Figure 1, they extend in the vertical direction X and are arranged in multiple pairs in symmetrical positions with respect to the horizontal center line CLy. The multiple waist position marks 9 are intermittently arranged in the horizontal direction Y on both sides of the horizontal center line CLy.

[0027] In this embodiment, there are two pairs of waist position marks 9, totaling four marks, positioned symmetrically with respect to the horizontal center line Cly. Each waist position mark 9 is a straight line extending in the vertical direction X when the diaper 1 is unfolded and fully extended, as shown in Figure 1. On one side in the horizontal direction Y, the waist position marks 9 include a waist position mark 9A with a relatively shorter longitudinal length and a waist position mark 9B with a relatively longer longitudinal length. Waist position mark 9A overlaps with waist position mark 9B in the vertical direction X and is positioned closer to the horizontal center line Cly than waist position mark 9B. Unless otherwise specified below, the term "waist position mark 9" includes both waist position mark 9A and waist position mark 9B.

[0028] The navel position mark 10 indicates the position of the wearer's navel in the vertical direction X when diaper 1 is fitted in the correct position. A pair of marks are placed symmetrically with respect to the horizontal center line CLy and intersect with the waist position mark 9.

[0029] In this embodiment, the umbilical cord mark 10 extends in the lateral direction Y when the diaper 1 is unfolded and in its maximum extended state as shown in Figure 1. More specifically, as shown in Figure 3, the outer end 10a of the umbilical cord mark 10 in the lateral direction Y is located further outward in the vertical direction X than the inner end 10b, that is, the outer end 10a is further from the vertical center line CLx than the inner end 10b, and the umbilical cord mark 10 is curved convexly outward in the vertical direction X (opposite side from the lateral center line CLy). What is meant by "the umbilical cord mark 10 is curved convexly outward in the vertical direction X" is, in other words, that a virtual straight line (not shown) extending from the top of the convexity in a plan view of the umbilical cord mark 10 along the normal to the top in the direction of the protrusion of the convexity does not intersect with the lateral center line CLy. Furthermore, the navel position mark 10 intersects with the waist position marks 9A and 9B, and the intersection point 11 with waist position mark 9A is located further inward in the vertical X direction (closer to the vertical center line CLx) than the intersection point 12 with waist position mark 9B.

[0030] The umbilical cord mark 10 has the same shape as described above not only when the diaper 1 is unfolded and fully extended, but also when the diaper 1 is in its natural state. In this specification, "natural state of the diaper" refers to a state in which no external force is applied to the elastic components of the diaper (for example, in the case of diaper 1, the elastic cuff member 71 and the elastic leg members 8, etc.).

[0031] In this embodiment, the waist position mark 9 and the navel position mark 10 are located on the side flap portion 20. More specifically, as shown in Figure 2, the side flap portion 20 is composed of a cuff sheet 70, a surface sheet 3, a back sheet 4, and an outer sheet 6, in order from closest to the wearer's skin, and the waist position mark 9 and the navel position mark 10 are located on at least one of the sheet-like members constituting the side flap portion 20, either on the skin-facing surface or the non-skin-facing surface.

[0032] The procedure for an assistant to put diaper 1 on a person to be worn is basically the same as the procedure for putting on this type of unfoldable disposable diaper. That is, as shown in Figure 4, the unfolded diaper 1 is placed with its skin-facing side (surface sheet 3 side) facing upwards, the person to be worn is laid on their back on the skin-facing side, the portion of diaper 1 from the crotch area M to the abdominal area F is pulled up through the person's crotch towards the abdomen, and the pair of fastening tapes 21, 21 are extended towards the person's abdomen and their ends are fastened to the fastening area 22 on the abdominal area F. Note that the unfolded diaper 1 at the time of putting on, as shown in Figure 4, is not in the unfolded and fully extended state as shown in Figure 1, but rather in a state where no external force is substantially applied to the elastic members (stretchable members such as various elastic members) (unfolded and unstretched state), and can be considered substantially the same as the natural state.

[0033] In order to fully utilize the various functions of diaper 1, such as its leak-proof function, and to obtain the desired effect, it is important to 1) select a diaper that fits the body shape of the person to be worn, and 2) put the diaper in the appropriate position on the person to be worn. In this regard, since diaper 1 has a waist position mark 9 and a navel position mark 10, as explained below, the above 1) and 2) are possible, and inconveniences such as leakage of excrement and reduced fit caused by incorrect putting on can be prevented.

[0034] When an assistant puts diaper 1 on a person to be worn, as shown in Figure 4, the assistant places the person to be worn face up on the skin-facing surface of the unfolded and non-stretched diaper 1 and attempts to position the person's waist between the pair of waist position marks 9,9 which are symmetrically positioned with respect to the horizontal center line Cly. As a result, in a top view of the unfolded and non-stretched diaper 1 as shown in Figure 4, if (A) the contour lines BL of the person to be worn's left and right waists are in the same position as the pair of waist position marks 9,9 which are in the symmetrical position, and (B) the person to be worn's navel N is in the same position in the vertical direction X as the intersection of the waist position mark 9 and the navel position mark 10, then diaper 1 is determined to fit the person to be worn. The "intersection of position mark 9 and navel position mark 10" in (B) above can be replaced with "a virtual straight line passing through the pair of intersections which are symmetrically positioned with respect to the horizontal center line Cly". In this embodiment, since there are two virtual lines, V1 passing through a pair of intersections 11,11 and V2 passing through another pair of intersections 12,12, it is sufficient to determine whether the wearer's navel N is in the same position as virtual line V1 or virtual line V2. The terms (A) and (B) above, "in the same position," include not only cases where the two are perfectly aligned in the relationship between multiple parts being compared (the relationship between the contour line BL and the waist position mark 9, or the relationship between the navel N and the intersection or the virtual line), but also cases where there is some deviation, but the two can be considered to be substantially aligned. The "deviation" can be set appropriately according to the wearer's age, etc., and is not particularly limited, but in the relationship between the contour line BL and the waist position mark 9, for example, the contour line BL may be located within 20 mm inward or outward in the horizontal direction Y from the waist position mark 9. Also, in the relationship between the navel N and the intersection or the virtual line, for example, the navel N may be located within 20 mm inward or outward in the vertical direction X from the intersection or the virtual line. On the other hand, if condition (A) above is not met, that is, if the contour lines BL of the left and right hips of the person to be worn are not in the same position as the pair of hip position marks 9,9 located in the symmetrical position, then the diaper 1 is determined not to fit the body shape of the person to be worn.Furthermore, if condition (B) above is not met, that is, if the navel N of the person to be worn is not in the same position in the vertical direction X as the intersection point or the virtual line in the symmetrical position, the diaper 1 is determined not to fit the body shape of the person to be worn.

[0035] If multiple pairs of waist position marks 9 are arranged symmetrically with respect to the horizontal center line CLy, the above operation is performed for each of these pairs of waist position marks to evaluate the fit of the diaper. In this embodiment, there are two pairs of waist position marks 9A, 9A located inside the horizontal direction Y, and two pairs of waist position marks 9B, 9B located outside the horizontal direction Y. The above operation is performed for each of these two pairs, and if both (A) and (B) are satisfied for either pair, the diaper 1 is determined to fit the body shape of the intended wearer. Otherwise, the diaper 1 is determined to not fit the body shape of the intended wearer.

[0036] If, as a result of the above operation, it is determined that diaper 1 is suitable for the wearer's body shape, that is, if both (A) and (B) above are met, diaper 1 is put on the wearer in the manner of normal procedures from the state shown in Figure 4. When diaper 1 is put on in this manner, it can fit snugly and properly in the appropriate position on the wearer's body, so that the various functions of diaper 1 are fully performed and inconveniences such as leakage of excrement are less likely to occur. On the other hand, if it is determined that diaper 1 is not suitable for the wearer's body shape, that is, if either (A) or (B) above is not met, the person assisting with putting on the diaper will understand that diaper 1 is not suitable for the wearer and will realize the need to prepare a different diaper of a different size. In other words, diaper 1 can prompt the person assisting with putting on the diaper to change to a different diaper of a different size, and can prevent inconveniences such as leakage of excrement that may occur due to forcing the wearer to wear an ill-fitting diaper.

[0037] Thus, with diaper 1, the waist position mark 9 and navel position mark 10 allow it to be determined whether the wearer's body type matches the recommended body type for diaper 1 before wearing diaper 1, thus preventing inconvenience caused by wearing an ill-fitting diaper. If it is determined that the wearer's body type matches the recommended body type for diaper 1, diaper 1 can be properly fitted to the body by following the usual fitting procedure. Furthermore, since the waist position mark 9 and navel position mark 10 are positioned laterally Y-outward from both side edges 50S, 50S of the absorbent core 50 or their extensions on the dorsal side R, both marks 9 and 10 are easily visible on both sides of the wearer's body in the lateral Y direction in a top view as shown in Figure 4, allowing for quick and accurate fitting of diaper 1 using both marks 9 and 10. Therefore, diaper 1 is easy to fit to the body in the appropriate position.

[0038] In the present invention, the method for forming markers that guide the proper placement of the diaper, such as the waist position mark 9 and the navel position mark 10, is not particularly limited, provided that they are visible to the skin-facing surface of the diaper. Examples include printing, embossing, and cutting, and one of these methods can be used alone or in combination of two or more. When the markers are formed by printing, the printing method is not particularly limited, and known printing methods such as gravure printing, flexographic printing, and inkjet printing can be used. The printing ink is not particularly limited, provided that it does not have adverse effects on the human body, and may be oil-based or water-based ink.

[0039] The aforementioned mark is typically a printed mark formed by printing, but other than printed marks, examples include a) a mark with a different thickness between the surrounding area and the material, and b) a mark with a different surface shape between the surrounding area and the material. The "surrounding area" refers to the area surrounding the mark (for example, within 40 mm of the mark), and the "material" refers to the area where the mark is placed (the part of the diaper that overlaps with the mark in a plan view) or the constituent material of that surrounding area. In this embodiment, the "material" is the side flap portion 20. The mark in a) is a mark in which the thickness of the material in the area where the mark is placed is thicker or thinner than that of the surrounding area of ​​the mark. An example of the mark in b) is a mark in which the degree of unevenness or flatness of the skin-facing surface of the area where the mark is placed differs from that of the surrounding area of ​​the mark. For example, in this embodiment, the skin-facing surfaces of the mark placement area and its surrounding area are the skin-facing surfaces of the cuff sheet 70. If a fold is formed on the skin-facing surface of the cuff sheet 70 in the mark placement area, but no fold is formed in the surrounding area, the fold can become the mark described in b) above.

[0040] If the aforementioned markers (waist position marker 9 and navel position marker 10) are printed marks, the printed marks can be placed at any position in the thickness direction of the placement area of ​​the printed marks (the portion of the diaper that overlaps with the printed marks in a plan view). For example, in this embodiment, the markers are placed on the side flap portion 20, and as shown in Figure 2, the side flap portion 20 has a cuff sheet 70, a surface sheet 3, a back sheet 4, and an outer sheet 6. The printed markers can be placed on one or more of these components on the skin-facing and / or non-skin-facing surfaces. From the viewpoint of improving visibility, it is preferable to place the printed markers on the side closer to the wearer's skin than the back sheet 4.

[0041] When the aforementioned mark is printed on a sheet that can come into contact with the wearer's skin when the diaper 1 is worn (hereinafter also referred to as the "skin-facing sheet"), there is an advantage in that the mark is highly visible. However, there is a concern that the mark may come into contact with the wearer's skin, and the printing ink that forms the mark may be transferred to the skin. Specific examples of the skin-facing sheet include the surface sheet 3 and the cuff sheet 70. In contrast, when the aforementioned mark is printed on a sheet located inward in the thickness direction from the skin-facing sheet and adjacent to the skin-facing sheet (hereinafter also referred to as the "skin-facing adjacent sheet"), although the visibility of the mark is slightly inferior compared to when it is printed on the skin-facing sheet, the aforementioned inconvenience is less likely to occur, and it has the advantage of being gentler on the wearer's skin. Specific examples of the skin-facing adjacent sheet include the specific sheet described later.

[0042] The waist position mark 9 may be printed in a different hue from the surrounding area. This improves the visibility of the waist position mark 9 and ensures that the predetermined effects of the present invention are achieved more reliably. For example, if the surrounding area of ​​the waist position mark 9 is white, the hue of the waist position mark 9 can be black, red, blue, yellow, green, etc. The surrounding area of ​​the waist position mark 9 may be an area within preferably 40 mm, more preferably 30 mm, of the mark 9 in a plan view of the diaper 1.

[0043] In this specification, unless otherwise specified, the colors of the markers and other parts of diaper 1 follow the Munsell color system. The Munsell color system is a color system that represents color in three stages: hue, lightness, and saturation. In the Munsell color system, hue is indicated by a combination of a numerical value (0.1 to 10, etc.) and the five basic hues R (red), Y (yellow), G (green), B (blue), and P (purple) arranged clockwise on the Munsell color wheel, and the 10 main hues "YR (yellow-red), GY (yellow-green), BG (blue-green), PB (blue-purple), and RP (red-purple)" placed between them. In the Munsell color system, lightness increases as the numerical value increases, and darkness increases as the numerical value decreases. In the Munsell color system, saturation increases as the numerical value increases, and dullness increases as the numerical value decreases. The color (hue, lightness, and saturation) of each part of diaper 1 can be determined by comparing it with a color sample. As the color sample, the "Standard Colors for Paints: JP Colors" of the Japan Paint Manufacturers Association can be used.

[0044] When the hue of the area where the waist position mark 9 is placed is white, it is preferable that the lightness of the waist position mark 9 in the Munsell color system be 5 or less, and the waist position mark 9 may be black with a lightness of zero. Since the lightness of white in the Munsell color system is 10, if the lightness of the waist position mark 9 in the Munsell color system is 5 or less, the difference in lightness between the waist position mark 9 and the background will be greater than 5, which may improve the visibility of the waist position mark 9. Furthermore, the hue of the waist mark 9 is preferably complementary to the skin color of the infant, who is the primary wearer of the diaper 1. Specifically, it is preferable that the hue is in the range from R (red) through P (purple) (i.e. counterclockwise) to B (blue) on the Munsell color circle.

[0045] In the natural state of diaper 1, the area where the waist position mark 9 is located (the part of the diaper that overlaps with the waist position mark 9 in a plan view) may be thinner than the surrounding area. As a result, the optical properties such as light transmittance differ between the area where the waist position mark 9 is located and the surrounding area, improving the visibility of the waist position mark 9 and ensuring that the predetermined effects of the present invention are achieved more reliably. The method for making the thickness of the area where the waist position mark 9 is located thinner than that of the surrounding area is not particularly limited. For example, this could involve reducing the number or mass of the components in the area where the waist position mark 9 is located compared to that of the surrounding area, or selectively embossing the area where the waist position mark 9 is located.

[0046] The size of the waist position mark 9 is not particularly limited, but from the viewpoint of ensuring the necessary visibility, it is preferable that the vertical X length 9L (see Figure 3) of the waist position mark 9 is 2 mm or more, and the horizontal Y length 9W (see Figure 3) of the waist position mark 9 is 10 mm or more, in the natural state of the diaper 1. Similarly, from the same viewpoint, it is preferable that the vertical X length 9L of the waist position mark 9 is 50 mm or less, and the horizontal Y length 9W of the waist position mark 9 is 4 mm or less, in the natural state of the diaper 1. Note that the lengths 9L and 9W shown in Figure 3 are for the unfolded and fully extended state of the diaper 1, not the natural state of the diaper 1, but there is no difference in the range of these lengths between the unfolded and fully extended state and the natural state.

[0047] The number of pairs of waist position marks 9 located symmetrically with respect to the horizontal center line CLy corresponds to the number of appropriate ways of wearing the diaper 1. In this embodiment, there are two pairs of waist position marks 9, so there are two appropriate ways of wearing the diaper 1. Specifically, the pair of waist position marks 9A, 9A located on the inner side of the horizontal direction Y corresponds to an appropriate way of wearing a small-sized wearer with a relatively short waist width (length between the left and right waist contour lines BL, BL), while the pair of waist position marks 9B, 9B located relatively on the outer side of the horizontal direction Y corresponds to an appropriate way of wearing a large-sized wearer with a relatively long waist width. The number of pairs of waist position marks 9 is not particularly limited and may be three or more.

[0048] If the number of pairs of waist position marks 9 is set to three, then, for example, it is possible to create diapers that can accommodate three body types: the body type that fits the "standard" size of the S-size diaper, a body type smaller than the "standard," and a body type larger than the "standard." In that case, a preferred example of the pattern of waist position marks 9 on one side of the diaper 1 in the horizontal direction Y is a pattern in which three linear waist position marks 9 extending in the vertical direction X are intermittently arranged in the horizontal direction Y, and the longitudinal lengths of the three waist position marks 9 are different from each other. In the above pattern, from the viewpoint of improving the visibility of the waist position marks 9, it is preferable that the longitudinal length of the waist position marks 9 increases from the inside to the outside in the horizontal direction Y, similar to the form shown in Figure 3.

[0049] In this embodiment, as shown in Figures 1 and 3, the outer end 10a in the lateral Y direction of the navel position mark 10 is located further outward in the vertical X direction than the inner end 10b, and the navel position mark 10 is curved convexly outward in the vertical X direction (opposite side from the horizontal center line CLy). As a result, the diaper 1 of this embodiment has the characteristic of fitting a relatively wide range of body sizes, and this characteristic is particularly pronounced when the wearer is an infant. That is, when the wearer is an infant, the position of the infant's navel when the diaper is properly fitted tends to shift from the inside to the outside in the vertical direction (from the crotch side to the waist side) as the infant grows. Because the navel position mark 10 extends in the vertical X direction and the lateral Y direction as described above and is curved convexly towards the opposite side from the horizontal center line CLy, the diaper 1 can flexibly respond to this tendency and can be easily fitted in the appropriate position for infants of various sizes.

[0050] In the unfolded and fully extended state of diaper 1 as shown in Figure 3, it is preferable that the horizontal Y length 10W of the umbilical position mark 10 is longer than the vertical X length 10L of the umbilical position mark 10 (the relationship 10W > 10L holds). In other words, it is preferable that the umbilical position mark 10 is horizontally elongated. If the umbilical position mark 10 is horizontally elongated in the unfolded and fully extended state of diaper 1, the umbilical position mark 10 will also be horizontally elongated in the natural state of diaper 1 and in the unfolded and unextended state as shown in Figure 4. As mentioned above, the umbilical position mark 10 serves as an indicator of the vertical X position of the wearer's navel when diaper 1 is properly worn. If the umbilical position mark 10 is horizontally elongated, it is easier to recognize the umbilical position mark 10 as such an indicator compared to when it is vertically elongated (the relationship 10W < 10L holds), thus making it easier to put on diaper 1.

[0051] From the viewpoint of ensuring that the effects of the horizontally elongated umbilical cord mark 10 are more reliably achieved, in the unfolded and fully extended state of the diaper 1, the ratio of the length 10W to the length 10L (length 10W / length 10L) is preferably 1.5 times or more, more preferably 2 times or more, and preferably 10 times or less, and more preferably 8 times or less. From a similar viewpoint, the length 10W is preferably 5 mm or more, more preferably 7 mm or more, and preferably 40 mm or less, and more preferably 50 mm or less. The length 10L is preferably 1 mm or more, more preferably 3 mm or more, and preferably 35 mm or less, and more preferably 30 mm or less.

[0052] In the natural state of diaper 1, it is preferable that a plurality of vertical wrinkles (protruding ridges) extending in the vertical direction X are intermittently formed in the horizontal direction Y on the umbilical position mark 10 and its surrounding area on the skin-facing surface of diaper 1. This improves the visibility of the umbilical position mark 10 and ensures that the predetermined effects of the present invention are achieved more reliably. The vertical wrinkles can be formed, for example, by placing a vertical wrinkle forming member in the area where the umbilical position mark 10 is located. The vertical wrinkle forming member typically includes two sheets adjacent to each other in the thickness direction of diaper 1 and a plurality of elastic members arranged between the two sheets so as to be expandable and contractible in the horizontal direction Y. The two sheets are joined together by a plurality of joints intermittently arranged in the horizontal direction Y. That is, in the vertical wrinkle forming member, the joints and non-joints of the two sheets are alternately arranged in the horizontal direction Y. In the vertical wrinkle-forming member with this configuration, in the natural state of the diaper 1, one or both of the two sheets deform by contraction of the elastic member, bulging outwards on the opposite side (outward in the thickness direction) from the other sheet, and this deformed portion becomes a vertical wrinkle extending in the vertical direction X. The two sheets constituting the vertical wrinkle-forming member may be positioned closest to the skin of the wearer of the diaper 1 (i.e., the two sheets may be the closest-skinned sheet and the adjacent closest-skinned sheet), or they may be positioned furthest from the skin of the wearer of the diaper 1.

[0053] The umbilical cord mark 10 may be printed in a different hue than the surrounding area. For example, the hue of the umbilical cord mark 10 may be different from the hue of the area adjacent to the umbilical cord mark 10 in the vertical direction X. This improves the visibility of the umbilical cord mark 10 and ensures that the predetermined effects of the present invention are achieved more reliably. The surrounding area of ​​the umbilical cord mark 10 may be an area within preferably 40 mm, more preferably 30 mm, of the mark 10 in a plan view of the diaper 1. Specifically, for example, if the hue of the area surrounding the umbilical cord mark 10 is white, it is preferable that the lightness of the umbilical cord mark 10 in the Munsell color system be 5 or less, and the umbilical cord mark 10 may be black with a lightness of zero. Since the lightness of white in the Munsell color system is 10, if the lightness of the umbilical cord mark 10 in the Munsell color system is 5 or less, the difference in lightness between the umbilical cord mark 10 and its background will be greater than 5, which can improve the visibility of the umbilical cord mark 10. Furthermore, it is preferable that the hue of the umbilical cord mark 10 is complementary to the skin color of the infant, who is the main wearer of the diaper 1, and specifically, it is preferable that the hue is in the range from R (red) through P (purple) (i.e. counterclockwise) to B (blue) in the Munsell color circle.

[0054] The umbilical cord mark 10 may have the same hue as the waist mark 9, or it may have a different hue. If the waist mark 9 and the umbilical cord mark 10 have different hues, it becomes easier to distinguish between them visually, which may make the process of putting on the diaper 1 even easier.

[0055] In this specification, "same hue" means, unless otherwise specified, that when one of the two contrasting colors is one of the ten main hues on the Munsell color circle, the other hue is preferably within two colors, more preferably within one color, in a clockwise or counterclockwise direction from the first hue, i.e., the hues adjacent to the first hue.

[0056] For example, if the hue of the waist mark 9 is GY (yellow-green) on the Munsell color circle, the hue of the navel mark 10, which has the same hue as the waist mark 9, is preferably YR (yellow-red), Y (yellow), G (green), or GY (yellow-green), more preferably Y (yellow) or G (green). When the waist mark 9 and the navel mark 10 have the same hue, the difference in brightness between the two is preferably 5 or less, more preferably 3 or less, and the difference in saturation between the two is preferably 7 or less, more preferably 5 or less.

[0057] As a specific example of "having different hues at waist position mark 9 and navel position mark 10," if the hue of waist position mark 9 is one of the 10 main hues in the Munsell color circle, then the hue of navel position mark 10 is either the hue located on the opposite side of waist position mark 9, i.e., its complementary color, or the hues adjacent to that complementary color. When the waist mark 9 and the navel mark 10 have different hues, the difference in brightness between the two is preferably greater than 5, more preferably greater than 7, and the difference in saturation between the two is preferably greater than 7, more preferably greater than 9.

[0058] The diaper 1 of this embodiment has a surface sheet 3 positioned on the skin-facing side of the absorbent core 50, and a pair of leak-proof cuffs 7, 7 positioned to cover both sides of the surface sheet 3 along the longitudinal direction X. A preferred example of the umbilical cord position mark 10 is a "umbilical cord position mark printed on the skin-facing side of a sheet of a different color from the surface sheet 3 and the leak-proof cuff 7 (cuff sheet 70) in a color with lower brightness than the color of the skin-facing side of the sheet" (hereinafter also referred to as the "specific umbilical cord position mark"). The sheet on which the specific umbilical cord position mark is printed (hereinafter also referred to as the "specific sheet") is typically positioned between the surface sheet 3 and the back sheet 4 in the back side R. Preferably, the specific sheet is positioned at and near the end of the back side R in the longitudinal direction X of the diaper 1, specifically, for example, between a pair of fastening tapes 21, 21. The specific sheet may be arranged continuously in the transverse direction Y from one fastening tape 21, 21 to the other, or it may be arranged only at the base (inner end in the transverse direction Y) of each fastening tape 21, 21 and its vicinity. The material of the specific sheet is not particularly limited and may be, for example, a nonwoven fabric or a resin film. The specific sheet may be stretchable in the transverse direction Y.

[0059] In this embodiment, as shown in Figure 5, multiple pairs of fastening markers 23 indicating the fastening position of the fastening portion 21A of the fastening tape 21 are arranged in the fastening region 22 at symmetrical positions with respect to the horizontal center line CLy. In the illustrated configuration, two pairs of fastening markers 23 are arranged: a pair of fastening markers 23A,23A arranged on the inner side of the horizontal direction Y, and a pair of fastening markers 23B,23B arranged on the outer side of the horizontal direction Y. The pair of fastening markers 23A,23A corresponds to an appropriate wearing style for small-sized wearers with a relatively short waist width (length between the left and right waist contour lines BL, BL), while the pair of fastening markers 23B,23B corresponds to an appropriate wearing style for large-sized wearers with a relatively long waist width. These multiple fastening markers 23 are intermittently arranged in the horizontal direction Y on both sides of the horizontal center line CLy in the horizontal direction Y. Unless otherwise specified below, the term "attachment marker 23" includes both attachment marker 23A and attachment marker 23B.

[0060] The number of pairs of waist position marks 9 is preferably the same as or greater than the number of pairs of fastening marks 23. In this embodiment, both the number of pairs of waist position marks 9 and the number of pairs of fastening marks 23 are 2, and the number of pairs of waist position marks 9 equals the number of pairs of fastening marks 23. Body types vary from person to person. For example, even among people with the same waist circumference, some have a larger lower abdomen and relatively greater thickness in the front-to-back direction, while others have a smaller lower abdomen but relatively greater width. Infants, in particular, have significant individual differences in body type. Since the aforementioned relationship is established between the waist position mark 9 and the fastening mark 23 of the fastening tape 21, diaper 1 can be finely adjusted to the body type of the intended wearer, and can fit snugly and appropriately in the right position on the wearer's body.

[0061] In this embodiment, in addition to the number of pairs of waist position marks 9 equaling the number of pairs of fastening marks 23, furthermore, on both sides of the horizontal Y direction of the horizontal center line CLy, there is a correspondence between the innermost of the multiple waist position marks 9 intermittently arranged in the horizontal Y direction (waist position mark 9A) and the innermost of the multiple fastening marks 23 intermittently arranged in the horizontal Y direction (fastening mark 23A), and there is also a correspondence between the outermost of the multiple waist position marks 9 intermittently arranged in the horizontal Y direction (waist position mark 9B) and the outermost of the multiple fastening marks 23 intermittently arranged in the horizontal Y direction (fastening mark 23B). Here, "one of the waist position marks 9 and one of the fastening marks 23 are in a correspondence relationship" means that the former and the latter are used together to properly position the diaper 1 on the body. For example, if the contour lines BL (see Figure 4) of the left and right hips of the person to be worn are in the same position as the hip position mark 9A, that is, if the hip position mark 9A is used among the multiple hip position marks 9, the diaper 1 can be attached to the body in the correct position by using the attachment mark 23A that corresponds to the hip position mark 9A among the multiple attachment marks 23. This correspondence can be easily understood by visually observing the diaper 1, and this makes it even easier to attach the diaper 1 to the body in the correct position.

[0062] Information regarding the wearer's size corresponding to the fastening mark 23 may be printed on or near the fastening mark 23. As mentioned above, fastening mark 23A corresponds to a small-sized wearer and fastening mark 23B corresponds to a large-sized wearer. In this embodiment, as shown in Figure 5, the number "1" is printed near fastening mark 23A and the number "2" is printed near fastening mark 23B, so that it is easy to understand that fastening mark 23A with the smaller number is for small sizes and fastening mark 23B with the larger number is for large sizes.

[0063] Thus, information regarding the wearer's size corresponding to the fastening mark 23 may be written on or near the fastening mark 23, and this information may also be written near the waist position mark 9. This can make it even easier to understand the correspondence.

[0064] In this embodiment, as shown in Figures 1 and 4, a navel contact mark 13 is placed on the skin-facing surface of the ventral portion F (the skin-facing surface of the surface sheet 3) to be brought into contact with the wearer's navel during use. When putting on the diaper 1, the wearer lies on their back on the skin-facing surface of the dorsal portion R of the diaper 1, which is in the unfolded and non-stretched state as shown in Figure 4, with the crotch portion M and ventral portion F of the diaper 1 extending downward from the wearer's crotch. The ventral portion F of the diaper 1 is then pulled up towards the wearer's abdomen, and the navel contact mark 13 functions as a marker to position the pulled-up ventral portion F in the appropriate location on the wearer's abdomen. In other words, when putting on the diaper 1, the ventral portion F, which has been pulled up through the wearer's crotch, should be positioned on the wearer's abdomen so that the navel contact mark 13 on the skin-facing surface of the ventral portion F aligns with the wearer's navel N. In this way, the ventral portion F can be positioned in the appropriate location on the abdomen.

[0065] From the viewpoint of ensuring that the effect of the umbilical contact mark 13 is achieved more reliably, the lateral Y length 13W (see Figure 1) of the umbilical contact mark 13 is preferably 0.05 times or more and 0.7 times or less of the lateral Y length 10W (see Figure 3) of the umbilical position mark 10.

[0066] The navel contact mark 13 can be formed in the same way as the waist position mark 9 and the navel position mark 10, for example, by printing, embossing, cutting, etc. Typically, the navel contact mark 13 is formed by printing and is a printed mark.

[0067] It is preferable that the umbilical cord contact mark 13 has the same hue as the umbilical cord position mark 10. Having the same hue as the umbilical cord position mark 10 and the umbilical cord contact mark 13 makes it possible to communicate the relationship between both marks 10 and 13 to the person assisting in putting on the diaper 1, and to encourage the correct use of the umbilical cord contact mark 13. The meaning of "same hue" here is as described above. Furthermore, when the umbilical cord position mark 10 and the umbilical cord contact mark 13 have the same hue, the difference in brightness between the two is preferably 5 or less, more preferably 3 or less, and the difference in saturation between the two is preferably 7 or less, more preferably 5 or less.

[0068] In this embodiment, as shown in Figures 1 and 5, a navel non-contact mark 14 is positioned on the non-skin-facing side of the diaper 1 (the non-skin-facing side of the outer sheet 6) at a position corresponding to the navel contact mark 13, indicating the position of the wearer's navel. The navel contact mark 13 and the navel non-contact mark 14 have the same hue. The meaning of "same hue" is as described above. Since the navel contact mark 13 is positioned on the skin-facing side of the ventral part F, when the ventral part F is pulled up to the wearer's abdomen from the state shown in Figure 4 and positioned on the abdomen, the navel contact mark 13 faces the abdomen and becomes difficult for the person assisting with the application to see. However, since the navel non-contact mark 14 is positioned on the opposite side of the navel contact mark 13, it is possible to position the ventral part F in the appropriate position on the abdomen by using the navel non-contact mark 14. From the viewpoint of ensuring that the effects of the non-contact mark 14 are achieved more reliably, the difference in brightness between the contact mark 13 and the non-contact mark 14, which have the same hue, is preferably 5 or less, more preferably 3 or less, and the difference in saturation between the two is preferably 7 or less, more preferably 5 or less.

[0069] The present invention includes a disposable diaper package comprising a disposable diaper, represented by the diaper 1 described above, and a packaging container that houses the diaper inside. The disposable diaper is as described above. The disposable diaper package of the present invention (hereinafter also referred to as "the package of the present invention") typically includes one packaging container and a plurality of diapers 1 housed in the one packaging container. The packaging container only needs to be capable of housing the plurality of diapers 1, and its material and structure are not particularly limited. A specific example of a packaging container is a packaging bag made of a flexible sheet (for example, a sheet made of synthetic resin).

[0070] The packaging of the present invention is characterized in that the packaging container has information relating to a waist position mark 9 and a navel position mark 10. The information is typically printed on the outer surface of the packaging container. Preferably, the information includes a recommendation to use a different disposable diaper of a different size if the diaper 1 contained in the packaging container cannot be fitted at the positions defined by the waist position mark 9 and the navel position mark 10. This makes it possible to encourage users of the packaging of the present invention to better understand the proper way to fit the diaper 1 using both marks 9 and 10, and to prevent inconveniences caused by wearing an ill-fitting diaper.

[0071] The present invention is not limited to the embodiments described above and can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0072] 1. Disposable diapers 9,9A,9B Waist position markers 10. Navel position mark 13. Navel contact mark 14. Umbilical non-contact mark 20 Side flap section 21 Fastening Tape 22 Attachment area 23, 23A, 23B Stopping markers 50 absorbent cores F ventral part M Inseam R dorsal part X vertical direction Y (horizontal direction)

Claims

1. It has a longitudinal direction extending from the wearer's abdominal side through the crotch area to the back, and a transverse direction perpendicular to the longitudinal direction, and is divided into an inseam section located in the crotch area, an abdominal section located on the wearer's abdominal side than the inseam section, and a dorsal section located on the wearer's back side than the inseam section. A disposable diaper having an absorbent core that absorbs and retains bodily fluids, and a pair of fastening tapes provided on both sides of the dorsal portion along the longitudinal direction, which are fastened to the fastening area of ​​the ventral portion when in use, On the dorsal portion, markings including a waist position mark and a navel position mark are visibly positioned on the skin-facing surface of the diaper, extending laterally outward from the side edges of the absorbent core along the longitudinal direction or their extensions. The waist position marks extend in the vertical direction and are arranged in multiple pairs at symmetrical positions with respect to a horizontal center line that divides the diaper in the horizontal direction and extends in the vertical direction. A disposable diaper in which the navel position marks are arranged in pairs at symmetrical positions with respect to the horizontal center line and intersect with the waist position marks.

2. The disposable diaper according to claim 1, wherein three or more pairs of the waist position marks are arranged at the symmetrical positions.

3. The disposable diaper according to claim 1 or 2, wherein, in the natural state of the diaper, the portion where the waist position mark is located is thinner than the surrounding portion.

4. The disposable diaper according to claim 1 or 2, wherein the waist mark is printed in a different hue from the surrounding area of ​​the waist mark, and the navel mark is printed in a different hue from the surrounding area of ​​the navel mark.

5. The disposable diaper according to claim 1 or 2, wherein the lateral outer end of the umbilical cord mark is located further outward in the vertical direction than the inward end, and the umbilical cord mark is curved convexly toward the outward direction in the vertical direction.

6. The disposable diaper according to claim 1 or 2, wherein, in the unfolded and fully extended state of the diaper, the horizontal length of the umbilical cord mark is longer than the vertical length of the umbilical cord mark.

7. The disposable diaper according to claim 1 or 2, wherein, in the natural state of the diaper, a plurality of vertical wrinkles extending in the vertical direction are intermittently formed in the horizontal direction on the umbilical cord mark and its surrounding area on the skin-facing surface of the diaper.

8. Furthermore, it includes a surface sheet positioned on the skin-facing side of the absorbent core, and a pair of leak-proof cuffs arranged to cover both sides of the surface sheet along the longitudinal direction, The disposable diaper according to claim 1 or 2, wherein the umbilical cord mark is printed on the skin-facing side of a sheet of a different color from the surface sheet and the leak-proof cuff, in a color with lower brightness than the color of the skin-facing side of the sheet.

9. A navel contact mark is placed on the skin-facing surface of the ventral portion, which is to be placed against the wearer's navel during use. The disposable diaper according to claim 1 or 2, wherein the umbilical cord position mark and the umbilical cord contact mark have the same hue.

10. A disposable diaper package comprising a disposable diaper according to claim 1 or 2 and a packaging container for housing the diaper inside, A package for disposable diapers, wherein the packaging container contains information regarding the waist position mark and the navel position mark.

Images