JP2005198783A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pantie-shaped disposable diaper capable of being easily applied to an infant aged a few months, making it easy to move a leg during wearing and gently fitted to the skin of the infant. <P>SOLUTION: The pantie-shaped disposable diaper is characterized in that the stretching stress of a girth part is 50-150 cN, the ratio (L1/L2) of the minimum value L1 of crotch width L and the distance L2 from the point P on the opening edge part 82 of a leg opening part positioned at a region becoming minimum in the crotch width L to the vertical straight line La of the diaper passing the end point Q on the side of the abdominal part A of the edge part 82 is 2.0-2.5 and the ratio (S1/S2) of the area S1 of the region surrounded by the straight line Lb connecting the point P and the end point Q and the edge part 82 and the area S2 of the region surrounded by the vertical straight lines Lc and Lc of the diaper passing the point P and the lateral straight lines Ld and Lb of the diaper crossing the straight lines Lc and Lc and passing the end point Q is 0.45-0.55. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pants-type disposable diaper that can be easily worn.

  Conventionally, as a disposable diaper, a pants-type diaper for a child (older-aged child) who can stand up or walk by himself is known (see Patent Document 1).

Japanese Patent Laid-Open No. 2001-478

Conventionally, a pants-type disposable diaper has been allowed to stand for a standing infant by passing one leg through each leg opening.
For this reason, it was not considered to let a young child whose neck is not set up or to hold and stand, particularly to put it on in a laid state. Therefore, a pants-type diaper that can be suitably used for low-age children has not been provided yet.

  An object of the present invention is to prevent leakage from around the foot without excessively tightening the foot, and to easily pass the baby's foot through the leg opening when the diaper is worn. An object of the present invention is to provide a pants-type disposable diaper that is suitable for low-age children and can be easily put on.

  The present invention relates to a pants-type disposable diaper comprising a liquid-retaining absorbent body, having an abdominal part, a crotch part, and a dorsal part, and having a waist opening and a pair of leg openings. Is stretchable in the circumferential direction, and the region from the longitudinal end line of the absorber to the upper end line of the leg opening in the waistline is extended to 50% of the maximum elongation rate in the diaper width direction. From the minimum value L1 of the crotch width and the point P on the opening edge of each leg opening located at the position where the crotch width is minimum. The ratio (L1 / L2) with the distance L2 to the virtual straight line La in the diaper longitudinal direction passing through the end point Q on the ventral side of the part is 2.0 to 2.5, and the point P and the end point Q are Surrounded by an imaginary straight line Lb and the opening edge of the leg opening The area of the region is surrounded by the virtual straight line Lc in the diaper vertical direction passing through the point P, the virtual straight line Ld in the diaper width direction orthogonal to the virtual straight line Lc and passing through the end point Q, and the virtual straight line Lb. The object is achieved by providing a disposable diaper in which the area ratio (S1 / S2) between the two regions when the area of the region is S2 is 0.45 to 0.55.

The disposable diaper of the present invention can prevent leakage from around the foot without excessively tightening the foot, and easily put the baby's foot through the leg opening when wearing the diaper. Can be easily put on the baby.
The disposable diaper of the present invention is particularly suitable for a low-age child and has an advantage that it can be easily applied to a newborn baby who is sleeping.

The present invention will be described below based on preferred embodiments with reference to the drawings.
The disposable diaper 1 as one embodiment of the present invention is a pants-type diaper as shown in FIG. As shown in FIGS. 2 and 3, the diaper 1 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorbent 4 interposed between both sheets 2 and 3. It comprises an absorbent main body 10 and an exterior body 5 that is positioned on the outer side (non-skin contact surface side) of the absorbent main body 10 to jointly fix the absorbent main body 10 and is worn by the wearer's stomach. It has an abdominal side A disposed on the side, a back side B disposed on the back side, and a crotch C positioned therebetween. Then, both side edge portions of the ventral side portion A and both side edge portions of the back side portion B are joined to each other by known joining means such as heat seal, high frequency seal, ultrasonic seal, etc., and a pair of side seal portions 50, 50 are formed. The waist opening 7 and a pair of leg openings 8 and 8 are formed in the diaper 1 by the joining.

  As shown in FIG. 2, the absorbent main body 10 has a vertically long rectangular shape, the longitudinal direction of which coincides with the vertical direction of the diaper 1 (also referred to as the vertical direction of FIG. 2 or the diaper longitudinal direction), and is externally covered by a known joining means. The body 5 is joined to the central portion in the width direction. The absorber 4 has an hourglass shape in which the central portion in the longitudinal direction is constricted, and is sandwiched and fixed between the top sheet 2 and the back sheet 3.

  As shown in FIGS. 2 and 3, the absorbent main body 10 is formed with a pair of first three-dimensional guards 6A, 6A and second three-dimensional guards 6B, 6B extending in the longitudinal direction on the left and right sides thereof. As shown in FIG. 3, the first three-dimensional guard 6 </ b> A has a free end 61 </ b> A on the inner side in the width direction of the absorbent main body 10 and a fixed end (rising base end) 62 on the outer side. . An elastic member 63A is disposed in the vicinity of the free end 61A so as to be extendable and retractable along the free end 61A. On the other hand, the second three-dimensional guard 6 </ b> B has a fixed end 64 with the exterior material 5, and a free end 61 </ b> B on the outer side in the width direction than the fixed end 64. In the vicinity of the free end 61B, an elastic member 63B is disposed so as to be stretchable along the free end 61B.

  As shown in FIGS. 2 and 3, the exterior body 5 is composed of a laminated body of an outer layer sheet 51 and an inner layer sheet 52. The outer layer sheet 51 forms the outermost surface of the diaper 1, and the inner layer sheet 52 is disposed adjacent to the outer layer sheet 51 on the inner surface side of the diaper 1. The outer layer sheet 51 has extending portions extending in the front-rear direction from the front and rear end edges of the inner layer sheet 52, and each of the extending portions has the absorbent main body 10 disposed on the inner layer sheet 52 of the exterior body 5. After that, the absorbent main body 10 is folded back and bonded so as to cover the front and rear ends of the absorbent main body 10.

As shown in FIGS. 1 and 2, the diaper 1 has a pair of side gathers 90 in each of the waist portions D1, D2 in the abdominal side A and the back side B, so that the waist portion D of the diaper 1 is , Has a stretchability in the circumferential direction. Moreover, it has the waist gathers 70 in each waist part E1, E2 in the abdominal part A and the back part B, and, thereby, the waist part E of the diaper 1 has a stretching property in the circumferential direction.
Here, the waist portion E is a region from the opening edge portion 72 of the waist opening 7 to the length of 1/10 of the crotch length downward. On the other hand, the waistline portion D is a region located below the waist portion E and above the position of the upper end portion 83 of the leg opening 8.

As shown in FIGS. 1 and 2, the waist gather 70 has leg elastic members 71 on the waist portions E1 and E2 on the abdominal side A and the back side B, and the opening edge 72 of the waist opening 7 respectively. It is formed in a stretched state so as to extend along.
The pair of side gathers 90, 90 fix a plurality of elastic members 91 in an expanded state to the waist portions D 1, D 2 in the abdominal side A and the back side B, respectively, in the circumferential direction of the waist portion D. Is formed. These elastic members 91 are disposed and fixed in an extended state at least on the outer sides in the width direction from both side edges of the absorber 4 and are elastically stretchable at least in the center in the width direction of the portion overlapping the absorber 4. It is not arranged in a state where is expressed. The elastic member 91 is arrange | positioned in the state divided | segmented into two in the width direction of a diaper.

A leg gather 80 is formed in the leg opening 8 along the opening edge 82. The leg gather 80 is formed by fixing a plurality of elastic members 81 in an extended state along the opening edge portion 82.
Each of the elastic members 71, 81, 91 is sandwiched and fixed between the outer layer sheet 51 and the inner layer sheet 52 constituting the exterior body 5.

The diaper 1 is for a low monthly child and has a crotch length of 220 mm or less. The length L3 of the crotch is ½ of the total length LT (see FIG. 4) in the expanded and extended state.
Here, the expanded and extended state means that the side seal portion is peeled off, the diaper is set in the expanded state, the elastic member of each part is expanded in the expanded diaper, and the design dimensions (the influence of the elastic member is eliminated at all). In this state, it is expanded until it becomes the same size as when expanded in a flat shape.

  Further, the region D ′ in the waistline portion D from the longitudinal end line 44 of the absorbent body 4 to the upper end line 84 of the leg opening 8 is tensile when stretched to 50% of the maximum elongation rate in the diaper width direction. The load (hereinafter also referred to as the extension load of the waistline portion) is 50 to 150 cN, preferably 50 to 130 cN. Here, the “longitudinal end line of the absorber 4” refers to a line formed by the longitudinal end portion 41 (42) of the absorber 4 and a line obtained by extending it in the diaper width direction. The “upper end line of the leg opening” refers to a line connecting the upper ends of the pair of leg openings.

If the elongation stress at the waistline is less than 50 cN, the tightening force is weak when worn on a baby whose waistline circumference is relatively small, so that there is a risk of slipping off without following the movement. If the stretching stress at the waistline exceeds 150 cN / cm, there is a risk that the operation of inserting the hand from the leg opening to grasp the foot and the operation of pulling the foot grasping from the leg opening cannot be performed smoothly. There is also a risk of squeezing the baby's skin during wearing.
The extension load of the waistline portion may be within the above range in the region D ′ from the longitudinal end of the absorber to the crotch (same as the top end of the leg opening) in at least the waistline D, More preferably, the extension load measured by cutting out the entire waistline portion D is within the above range.

The elongation stress at the waistline portion is measured as follows.
[Method for measuring elongation stress at waistline]
From the diaper to the waistline portion D, the region D ′ from the longitudinal end 41 of the absorbent body 4 to the upper end 83 of the leg opening 8 is connected to the portion D1 located on the ventral side and the portion D2 located on the back side. It cuts out with the ring-shaped state made, and makes this a sample. In addition, when the distance from the opening edge part 72 of a waist opening part to the longitudinal direction edge parts 41 and 42 of the absorber 4 is different in the ventral part A and the back part B, the absorber in the back part B Regardless of the position of the longitudinal end portion 42, the same range of the ventral portion A and the dorsal portion B (the opening edge of the waist opening) The distance from the part 72 is the same range).

This sample is placed on a horizontal surface so that one side (surface forming the outer surface of the diaper) located on the ventral side is in contact with the horizontal surface, and the sample is in a naturally contracted state. The length between both ends (between the left and right side seal portions) is measured to obtain the initial length.
Then, the sample is fixed between chucks of a Tensilon tensile tester [manufactured by Orientec Co., Ltd., “RTC-1150A”] and stretched in the same direction as the diaper width direction at a speed of 300 mm / min.
Then, the sample is measured from the initial length with the design dimensions shown in FIG. 2 and FIG. 4 (same as the dimensions in the diaper deployed and extended state, except for the waist part D1 of the abdominal side A and the waist part D2 of the back side B). If the design dimensions are different, the average value) is the maximum elongation rate (elongation after stretching-initial length) / initial length x 100), and 50% of the maximum elongation rate. The tensile load at the time of extending to the elongation rate is obtained.

As shown in FIG. 4, the diaper 1 has a crotch width (a distance in the diaper width direction between the opening edges 82 of the pair of leg openings 8, 8) L, and the crotch width L A virtual straight line in the vertical direction of the diaper passing from the point P on the opening edge 82 of each leg opening 8 to the end point Q on the ventral side A side of the opening edge 82 of the leg opening 8, which is located at the smallest part The distance to La (distance measured along the diaper width direction) L2 (L1 / L2) is 2.0 to 2.5, preferably 2.2 to 2.4.
When the ratio (L1 / L2) is less than 2.0, the crotch width is small, and the leg opening is large, so the legs are easy to pass through, and it is easy to lay them down. On the other hand, the excrement becomes easy to leak from the leg opening. When the value is 2.2 or more, excrement leakage is very difficult to occur. If the ratio (L1 / L2) is more than 2.5, the crotch width is widened so that the excrement is difficult to move. However, at low ages, the legs are bent in the shape of a leg, so the legs pass through the leg openings. It's difficult, and it's harder to lie down. When this value is 2.4 or less, it is preferable because the wearability at a low age is further improved and the mobility at the time of wear is hardly inhibited.

As shown in FIG. 4, the diaper 1 has a front body F on the abdominal side A side from a center line (a center line extending in the diaper width direction) that bisects the total length LT in the expanded and extended state. And the front body F when it is divided into the back body G from the back side part has a part where the crotch width L is minimum. The crotch width L gradually increases from the portion toward the longitudinal direction of the diaper longitudinal direction.
In addition, when the crotch width L shows the minimum value over a predetermined length in the diaper longitudinal direction, the part closest to the center in the longitudinal direction is the part where the crotch width is the smallest. However, in this case, it is preferable that the portion showing the minimum value is within 1/10 of the total length of the diaper from the center in the longitudinal direction of the diaper toward the end.

Further, as shown in FIG. 4, the area S1 of the segmented region H surrounded by the virtual straight line Lb connecting the point P and the end point Q and the opening edge 82 of the leg opening 8, A diaper longitudinal virtual line Lc passing through the point P, a diaper width virtual line Ld passing through the upper end Q of the leg opening 8 perpendicular to the virtual line Lc, and a right angle surrounded by the virtual line Lb The area ratio (S1 / S2) of both regions when the area S2 of a triangular region (region H and region J is combined) is 0.45 to 0.55, preferably 0.46 to 0.50.
If the ratio (S1 / S2) is less than 0.45, the leg opening becomes small and the excrement becomes difficult to move. However, the younger-aged child is bent in a leg shape, so the leg opening Legs are difficult to pass through and are difficult to lay down.
If the ratio (S1 / S2) is more than 0.55, the leg opening becomes large, so that the leg can be easily passed through and it is easy to lay it down, but on the other hand, the excrement tends to leak from the leg opening.

The minimum value L1 of the crotch width L is preferably 150~170mm terms easily Doctor easily through the leg, the area S1 is 13.5～19.0Cm ² mm, the area S2 is 25.0～ It is preferably about 35.0 cm ² .

  The diaper 1 of the present embodiment is surrounded by a virtual straight line Le that connects the point P and the end point Q ′ on the back side B of the opening edge 82 of the leg opening, and the opening edge 82 of the leg opening. The area of the cutout circular region K is S3, a virtual straight line Lc in the diaper vertical direction passing through the point P, a virtual straight line Lf in the diaper width direction passing through the end point Q ′ perpendicular to the virtual straight line Lc, and The area ratio (S3 / S4) of the two regions is 0.45 to 0.4 when the area of a right triangular region (region K and region M combined) surrounded by the virtual straight line Le is S4. 55, particularly 0.46 to 0.50 is preferable from the viewpoint of further preventing the excrement from leaking from the crotch.

  The diaper 1 of the present embodiment can be easily put on a low-age child who is lying on his back. The method for attaching the diaper is not particularly limited, but an example of a preferred method for attaching is shown below.

(Installation method)
As shown in FIG. 5 (a), one hand is inserted into one leg opening 8, and one leg is grasped by that hand, and the leg is opened as shown in FIG. 5 (b). Pull out from the section. Then, as shown in FIG. 5C, the other leg is similarly pulled out from the other leg opening. When both feet pass, the diaper is pulled up to the wearer's waist as shown in FIG. In this way, the diaper 1 can be easily attached to a low-age child or the like who is lying on his back.

  According to the diaper 1 of the present embodiment, when the elongation stress of the waistline portion is in the specific range, for example, when the diaper is mounted by the preferable mounting method described above, the hand inserted into the diaper through the leg opening portion. The waist part of the diaper can be easily extended, and the free movement of the hand is not hindered by the pressure from the waist part, so the operation of inserting the hand from the leg opening and grabbing the foot is performed very smoothly be able to. In addition, since the leg opening has a specific shape, the hand can be pulled out smoothly while holding the foot, and the baby can easily move the foot while wearing it. The burden is small.

  Moreover, when the elongation stress of the waistline portion is in the specific range, good fit is exhibited for a wide range of babies having a relatively small waistline circumference to a relatively large baby. In other words, even when it is applied to a baby whose waist circumference is smaller than the standard circumference, the decrease in tightening force is relatively gentle, and the lack of tightening force can be prevented. Even in the case of squeezing, the increase in tightening force is relatively gentle, and excessive tightening and deterioration in operability during mounting can be prevented.

  Moreover, as for the diaper 1, the part 81a of the elastic member 81 for leg gather formation mentioned above is extended in the side gathers (expandable part) 90 in the waist part D. As shown in FIG. The term “extends into the stretchable part” means that a part 81a of the elastic member 81 enters between the elastic members 91 adjacent to each other in the region where the elastic member 91 is disposed, specifically, in the vertical direction of the diaper. Means that

As a material which comprises each part of the diaper 1 of this embodiment, what is normally used in the said technical field can be especially used without a restriction | limiting.
For example, as the surface sheet 2, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 3, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the absorbent body 4, a product obtained by wrapping a mixed fiber of fluff pulp and superabsorbent polymer particles with tissue paper, nonwoven fabric or the like (hereinafter referred to as packaging material) can be used. As the sheet constituting the three-dimensional guard, a water-repellent nonwoven fabric is preferably used. As the outer layer sheet 51 and the inner layer sheet 52, nonwoven fabrics produced by various production methods are preferably used.

As the elastic member of each part, various known elastic members can be used. For example, as the form of each elastic member, a thread-like thing (thread rubber etc.), a belt-like thing of a predetermined width (flat rubber etc.), Examples of materials for forming elastic members include natural rubber, synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like. it can.
The elastic member 90 that imparts stretchability to the waistline is preferably thread rubber, and the elastic member 81 for forming leg gathers is preferably flat rubber, and the waist elastic member 71 is flat rubber. It is preferable to use the shape.

  The diaper 1 has a tensile load (hereinafter also referred to as an elongation stress of the waist portion) of 100 to 250 cN, particularly 130 to 200 cN when the waist portion E is stretched in the diaper width direction to 50% of the maximum elongation rate. However, it is preferable from the viewpoint of achieving both ease of raising the diaper and difficulty in slipping off. As for the elongation stress of the waist part, the waist part E is cut out from the diaper in a ring-like state in which the part E1 located on the abdominal side A and the part E2 located on the back side B are connected. Except for the above, it is measured in the same manner as the elongation stress of the waistline portion.

In addition, the tensile load (hereinafter referred to as leg gather elongation stress) when the leg gather portion 80 is stretched to 50% of the maximum elongation rate in the diaper longitudinal direction is 50 to 200 cN, particularly 80 to 150 cN. It is preferable from the viewpoint of achieving both ease of foot passage and fit of low-age children.
The elongation stress of the leg portion is measured in the same manner as the elongation stress of the waistline portion, except that a portion where the leg portion elastic member is arranged is cut out from the diaper with a necessary width and used as a sample. Here, the “necessary width” means a minimum width necessary for measuring the extension load of the part, and does not require an unnecessarily large width (for example, cut out with a width including the absorber). Means that it is not necessary).

  The absorbent body 4 is preferable in that it can be easily along the baby's crotch when the bending rigidity is 1 to 25 cN / 50 mm and fits when worn. The bending rigidity includes rigidity in the longitudinal direction of the diaper and bending rigidity in the width direction, but at least the bending rigidity in the width direction is preferably within the above range.

The bending rigidity of the absorber 4 can be measured as follows.
[Measurement method of bending stiffness]
The measurement is performed using a Tensilon tester [RTC-1150A manufactured by Orientec Co., Ltd.] in accordance with JIS standard K7171 method (plastic-bending property test method) (R1 = 5.0 ± 0). 0.1 mm, R2 = 5.0 ± 0.2 mm).
The test piece is placed so as to pass between both edges of the support base where the edge span L is 50 mm, and the tip of the indenter is arranged so as to slightly touch the test piece. A load-deflection curve is obtained by lowering the indenter under conditions of a load cell of 5 kg (range: 200 cN) and a speed of 30 mm / min. Let the maximum value of the obtained bending stress be a bending rigidity value (cN / 50 mm).

[Method for preparing test piece]
A test piece takes out the absorber containing a packaging material from an absorbent article, and cuts out from the center part of the longitudinal direction and the width direction in the rectangular shape of 50 mm in a diaper longitudinal direction, and 80 mm in the width direction. 50 mm in the unit of the flexural rigidity value is the length of the short side of the test piece, and is the width of the test piece bent with the indenter at the time of the test. The test piece is bridged between both edges, with the long sides thereof aligned in the direction from one edge to the other. When measuring the bending rigidity in the diaper width direction, a test piece having a diaper longitudinal direction of 80 mm and a width direction of 50 mm is cut out. 50 mm in the unit of bending stiffness value, when the absorbent body including the mount cannot be taken out from the test piece absorbent article, measure the stiffness value including materials such as non-woven fabric and film, and the stiffness value of each material. The absorber stiffness value is obtained by calculating the stiffness value of the absorber.

  Further, the diaper 1 is located at a position where the crotch width L is minimum, from the point P on the opening edge 82 of each leg opening 8, the ventral side A side of the opening edge 82 of the leg opening 8. A distance L4 (see FIG. 4) measured along the longitudinal direction of the diaper is 75 to 95 mm for the distance to the end point Q of the child, so that it is easy to pass the foot of a low-age child, and excrement particularly leaks from the leg opening. It is preferable because it becomes difficult.

  The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

<Example 1>
The disposable diaper of the form shown in FIGS. 1-3 was manufactured.
The dimensions and physical properties of each part are shown in Table 1.

<Comparative Example 1>
A diaper was manufactured in the same manner as in Example 1 except that the elongation stress at the waistline portion was set to 200 cN.

<Comparative example 2>
A disposable diaper was manufactured in the same manner as in Example 1 except that the ratio (L1 / L2) and the ratio (S1 / S2) were 3.0 and 0.35 in this order.

<Performance evaluation>
About the disposable diaper of an Example and a comparative example, 1) The ease of mounting | wearing with respect to a low-aged child and 2) The slipping-off performance of a diaper were evaluated by the following method, respectively. The results are shown in Table 2.

1) Ease of installation [Evaluation method]
Each diaper is attached to a low-age infant model (with the leg bent in the shape of a leg in the stationary state) by the above-mentioned attachment method 1, and it is easy to pass the leg through the leg opening in the laid state. It evaluated about the ease of pulling up when pulling up a diaper in the state laid down after passing.
(Evaluation criteria)
When the diaper was easy to lift, it was difficult to pass the diaper, and it was difficult to lift the diaper. However, the diaper was easy to lift.

2) Misalignment performance [evaluation method]
Attach each diaper to a model of a young-aged child (a leg bent in a standing manner) with the peripheral edge of the waist opening aligned with the navel, and fix the chest of the model to the laboratory table. Measure the amount of diaper misalignment (distance from the navel) when the feet are lifted and the foot kick (movement specific to low age) is performed 20 times.

  From the results shown in Table 2, it can be seen that the disposable diapers of the examples are easy to pass through the feet of low-age infants, are easy to pull up in a sleeping state, and are not easily displaced. On the other hand, it can be seen that the diaper of Comparative Example 1 is difficult to shift but difficult to squeeze, and the diaper of Comparative Example 2 is difficult to squeeze and easy to shift.

FIG. 1 is a perspective view showing a disposable diaper as an embodiment of the present invention. FIG. 2 is a plan view showing a developed and extended state of the disposable diaper of FIG. FIG. 3 is a schematic cross-sectional view showing a cross section taken along the line II in FIG. 2 (a cross section of a portion having a minimum crotch width). FIG. 4 is a plan view for explaining the outer shape of the disposable diaper of FIG. 1 in the expanded and extended state. FIG. 5 is a view showing a state in which the disposable diaper of FIG. 1 is attached to a low-age child. FIG. 5 (a) shows a state in which a hand is inserted into one leg opening from the outer side of the diaper, FIG. ) Is a state where one hand of a baby sleeping on its back with its hand is pulled out from one leg opening, and in FIG. 5C, the other leg is similarly pulled out from the other leg opening. FIG. 5D shows a state where the diaper is pulled up and the mounting is completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 6A, 6B Solid guard 7 Waist opening 70 Waist gather 8 Leg opening 80 Leg gather 82 Opening edge
90 Side gather A Abdominal side B Back side C Crotch part D Girth part E Waist part P A point on the opening edge of the waist opening located in the part where the crotch width becomes the minimum Q The opening edge part of the waist opening Ventral end point

Claims (5)

In a pants-type disposable diaper comprising a liquid-holding absorbent body, having an abdomen, a crotch part and a dorsal part, and having a waist opening and a pair of leg openings,
The waistline portion is stretchable in the circumferential direction, and the region from the longitudinal end line of the absorber to the top end line of the leg opening in the waistline portion is up to 50% of the maximum elongation in the diaper width direction. The tensile load when extended is 50 to 150 cN,
A diaper that passes from the minimum value L1 of the crotch width and the point P on the opening edge of each leg opening located at the position where the crotch width is minimized, to the end point Q on the ventral side of the opening edge The ratio (L1 / L2) to the distance L2 to the imaginary straight line La in the vertical direction is 2.0 to 2.5,
The area of the region surrounded by the virtual straight line Lb connecting the point P and the end point Q and the opening edge of the leg opening is S1, the virtual straight line Lc in the vertical direction of the diaper passing through the point P, and the virtual The area ratio (S1 / S2) of the two regions is 0 when the area of the region surrounded by the virtual straight line Ld in the diaper width direction passing through the end point Q and perpendicular to the straight line Lc and the virtual straight line Lb is S2. Disposable diapers that are between 45 and 0.55. The disposable diaper according to claim 1, wherein the waist part has elasticity in a circumferential direction thereof, and a tensile load when the waist part is extended to 50% of a maximum elongation rate in a diaper width direction is 100 to 250 cN. A leg gather is formed in the leg opening along the edge of the opening, and the tensile load when the leg gather is extended to 50% of the maximum elongation in the diaper longitudinal direction is 50 to 200 cN. The disposable diaper according to claim 1 or 2. The disposable diaper according to any one of claims 1 to 3, wherein the absorber has a bending rigidity of 1 to 25 cN / 50 mm. The disposable diaper according to any one of claims 1 to 4, wherein a crotch length is 220 mm or less.

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