KR20050049385A - Disposable diaper - Google Patents

Abstract

A pants-type disposable diaper having a liquid-retaining absorbent body, having a ventral portion (A), a groin portion (C), and a belly side portion (B), and having a waist opening and a pair of leg openings. At the point P on the opening edge portion 82 of each of the leg openings, which is located at the minimum value L1 of the high-thickness width and the abdominal portion A of the opening edge portion 82. The ratio L1 / L2 of the distance L2 in the diaper longitudinal direction to the disadvantage Q on the side is 1.7 to 2.2.

Description

Disposable diapers {DISPOSABLE DIAPER}

The present invention relates to a pants-type disposable diaper which can be easily coated.

DESCRIPTION OF RELATED ART Conventionally, the pants type diaper for children (high age-old child) which became able to stand up or walk by oneself as a disposable diaper is known (Unexamined-Japanese-Patent No. 2001-478).

Conventionally, pants-type disposable diapers have been applied by allowing one foot to pass through an opening of both legs to an infant in a raised state.

For this reason, it was not considered to wear it in the low moon age child who cannot turn over, or cannot stand, especially when lying down. Therefore, there has not yet been provided a pants-type diaper which can be suitably used for low-income children.

The present invention is a pants-type disposable diaper having a liquid-retaining absorbent body, having a abdomen side, a groin section, and a belly side, and having a waist opening and a pair of leg openings. As a shortcoming of the ventral side of the opening edge at the point P on the opening edge of each leg opening, which is located at the minimum value L1 of the groin width and at the site of the minimum of the loft width, It is to provide a disposable diaper whose ratio L1 / L2 of the diaper longitudinal distance L2 to (Q) is 1.7-2.2 (Hereinafter, this invention is called this invention).

The present invention is a pants-type disposable diaper having a liquid-retaining absorbent body, having a ventral portion, a groin portion, and a back side portion, and having a waist opening and a pair of leg openings, wherein the circumferential portion of the body is in the circumferential direction thereof. It has elasticity, and the area from the longitudinal end line of the absorber to the upper end line of the leg opening in the body circumference has a tensile load of 50 to 150 cN when stretched to 50% of the maximum elongation in the diaper width direction. , At the point P on the opening edge of each leg opening, which is located at the minimum value L1 of the high width, and at the site where the high width is minimum, the shortcomings Q of the ventral side of the opening edge part are identified. The ratio L1 / L3 of the distance L3 to the virtual straight line La in the diaper longitudinal direction passing through is 2.0 to 2.5, and the virtual straight line Lb connecting the point P and the shortcomings Q and , Said above The diaper passing through the above-mentioned shortcomings Q at right angles to the virtual straight line Lc in the longitudinal direction of the diaper passing through S1 and the point P and the virtual straight line Lc passing through the area P of the area surrounded by the opening edge of the opening. It is to provide a disposable diaper having an area ratio (S1 / S2) of 0.45 to 0.55 in the area between the virtual straight line Ld in the width direction and the area surrounded by the virtual straight line Lb as S2 ( Hereinafter, when it calls 2nd invention, this invention is called).

The present invention (first invention) can prevent leaking around the legs while preventing overtightening of the legs, and can easily pass the baby's feet through the leg openings when the diaper is attached and can be easily coated. The present invention relates to a pants-type disposable diaper, which is particularly suitable for low age children.

The present invention (second invention) can prevent leakage around the legs without excessively tightening the legs, and when the diaper is attached, the baby's feet can be easily passed through the leg openings and can be easily coated. In particular, it relates to a pants-type disposable diaper suitable for low-month-old children.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated, referring drawings based on the preferable embodiment.

First, the disposable diaper 1 as one embodiment of the first invention will be described with reference to FIGS. 1 to 5.

The disposable diaper 1 is a pants-type diaper as shown in FIG. The diaper 1 is a liquid-retaining absorbent body interposed between the liquid permeable surface sheet 2, the liquid impermeable back sheet 3, and both sheets 2, 3, as shown in Figs. 4) and an exterior body 5 which is located on the outer side (surface side which does not touch skin) of the absorptive main body 10, and joins and fixes the absorptive main body 10, and is worn It has the abdominal part A arrange | positioned at the belly part of a wearer at the time, the back side part B arrange | positioned at a back part, and the groin part C located between them. Then, both side edge portions of the ventral portion A and both edge portions of the dorsal portion B are joined to each other by known joining means such as heat seal, high frequency seal, ultrasonic seal, or the like, so that the pair of side seal portions 50, 50 ), 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 body 10 has a vertically long rectangular shape, and the longitudinal direction thereof coincides with the longitudinal direction of the diaper 1 (also referred to as the vertical direction in FIG. 2, the diaper longitudinal direction). Is bonded to the central portion in the width direction of the exterior body 5 by means of the joining means. The absorbent body 4 forms the hourglass shape which the center part of the longitudinal direction was narrowed, and is pinched and fixed between the surface sheet 2 and the back sheet 3. As shown in FIG.

As shown in FIG. 2 and FIG. 3, the absorbent body 10 includes a pair of first three-dimensional guards 6A, 6A and second three-dimensional guards 6B, 6B extending in the longitudinal direction on both the left and right sides thereof. Formed. As shown in FIG. 3, 6 A of 1st three-dimensional guards have 61 A of free ends in the width direction inner side of the absorptive main body 10, and have the fixed end 62 (base end which is standing up) on the outer side. In the vicinity of the free end 61A, the elastic member 63A is freely stretched along the free end 61A. On the other hand, the second three-dimensional guard 6B has a fixed end 64 with the packaging material 5 and has a free end 61B on the outer side in the width direction than the fixed end 64. In the vicinity of the free end 61B, the elastic member 63B is freely stretched along the free end 61B.

As shown to FIG. 2 and FIG. 3, the exterior body 5 is comprised from the laminated body of the outer layer sheet 51 and the inner layer sheet 52. As shown in FIG. The outer layer sheet 51 forms the outermost surface of the diaper 1, and the inner layer sheet 52 is disposed on the inner surface side of the diaper 1 adjacent to the outer layer sheet 51. The outer layer sheet 51 has extension protrusions extending from the front and rear edges of the inner layer sheet 52 in the front-rear direction, and these extension protrusions respectively absorb the main body 10 on the inner layer sheet 52 of the exterior body 5. ) Is disposed, and is bonded back to the absorbent main body 10 side so as to cover the front and rear ends of the absorbent main body 10.

As shown in FIG. 1 and FIG. 2, the diaper 1 has a pair of side wrinkles 90 in the width direction in each of the trunk circumferences D1 and D2 in the ventral portion A and the belly side B. FIG. It has an elastic part to expand and contract, and the trunk | drum circumference D of the diaper 1 has elasticity by the circumferential direction by it. Furthermore, each of the waist portions E1 and E2 in the ventral portion A and the belly portion B has a waist pleat 70, whereby the waist portion E of the diaper 1 is elastic in its circumferential direction. Have

Here, the waist part E is an area | region from the opening edge part 72 of the waist opening part 7 to the length of 1/10 of the inguinal length down. On the other hand, the trunk circumferential portion D is a region located below the waist portion E and located above the position of the upper end portion 83 of the leg opening 8.

As shown in Figs. 1 and 2, the waist wrinkles 70 are formed at the waist portions E1 and E2 at the ventral side A and the back side B, and the waist elastic members 71 each have a waist opening ( It is fixed and formed in the extended state so that it may extend along the opening edge part 72 of 7).

The pair of side pleats 90 and 90 have a plurality of side circumferences D1 and D2 in the ventral portion A and the dorsal side B, respectively, in the circumferential direction of the circumferential portion D, respectively. It is formed by fixing the elastic member 91 in an extended state. These elastic members 91 are arranged and fixed at least in the widthwise outer portion than at both edges of the absorber 4, and at least in the widthwise center portion of the portion overlapping with the absorber 4, elastic elasticity is not expressed. It is arranged. The elastic member 91 is arrange | positioned in the state divided into two in the width direction of a diaper.

Moreover, the leg wrinkles 80 are formed in the leg opening part 8 along the opening edge part 82. The leg pleats 80 are formed by fixing the plurality of elastic members 81 in an extended state along the opening edge portion 82.

Each of the elastic members 71, 81, 91 described above is clamped between the outer layer sheet 51 and the inner layer sheet 52 constituting the outer package 5.

The diaper 1 is for low lunar age children and has a groin length of 50 to 220 mm. The groin length L4 is 1/2 the length of the diaper full length (LT: see FIG. 4) in the expanded and stretched state.

Here, the developed and stretched state means that the side seal is separated and separated to form a diaper, and the diaper in the developed state is stretched in a planar shape in a state in which the elastic members of the respective parts are stretched and the design dimensions (the influence of the elastic member are completely excluded). It is an unfolded state until it reaches the same size as the

As shown in FIG. 4, the diaper 1 has a minimum value L1 of a high width (L: the distance in the diaper width direction between the opening edge portions 82 and 82 of the pair of leg openings 8 and 8). , At the point P on the opening edge portion 82 of each leg opening 8, which is located at the portion where the high width L is minimized, the clothing of the opening edge portion 82 of the leg opening 8 is applied. The ratio (L1 / L2) of the diaper longitudinal distance (L2: distance measured along the diaper longitudinal direction) to the disadvantage (Q) on the side (A) side is 1.7 to 2.2, preferably 1.8 to 2.0. By setting it as this range, even if it is a body shape in which a leg is bent in a <shape like a low-moon age child, it is easy to apply it in the state lying down by the mounting method mentioned later, and after coating, feces do not leak easily from a leg opening part.

The present inventors have found that it is difficult to pass a leg as a result of applying a conventional pant-type diaper for a low-middle age child as it is made to be small in size as it is. As a result of the investigation, it was found that there is a cause in the elasticity of the leg opening. In other words, diapers for high-waste age infants with large amounts of excretion have a strong elasticity to prevent leaking from the leg openings, which makes it difficult to open the leg openings in a state where the low-month-old infants are lying down. will be. However, in order to solve this problem, the elasticity of the opening is weakened, and as a result, feces easily leak. In other words, even if the elasticity is small, the excretion does not leak well, and even in the state of low moon age infants lay easy to develop pants-type diapers easy to wear.

However, as a result of various studies, the present inventors have found that L1 / L2 is correlated with small (less than 1.7) and leaky in the pants-type diaper for the old and old children. Therefore, as a result of increasing this value, it was found that the leakage in the leg opening was significantly reduced. Moreover, in that case, it was also found that sufficient leakage preventing performance can be obtained without making the elastic force applied to the leg opening too strong. However, on the other hand, it was found that when this value is increased indefinitely, it is difficult to pass the legs bent in the shape of <like the low moon age, and the coating becomes difficult. In particular, if the joints are not yet fully grown, such as newborns, they are so worried about dislocation that they lose their motivation to wear them. Therefore, it is preferable to set it as said range because body shape, such as a low moon age child, can make both easy to prevent leakage and coat | coat.

As shown in FIG. 4, the diaper 1 is a whole body on the abdominal part A side from the center line (center line extended in the diaper width direction) which divides the total length LT in the expanded and extended state into 2 parts. The said whole body part F at the time of dividing into (F) and the back body G on the back side part B side has the site | part which the said high liver width L becomes minimum. And the high width L is gradually increasing from the site | part to the front-back direction of the diaper longitudinal direction.

On the other hand, when the high width L shows the minimum value over the predetermined length of the diaper longitudinal direction, the part closest to the center of the longitudinal direction is made into the part where the high width becomes the minimum. In this case, however, it is preferable that the part showing the minimum value is within 1/10 of the diaper total length from the center of the diaper longitudinal direction toward the end direction.

As shown in FIG. 4, the diaper 1 has a minimum value L1 of a high width (L: the distance in the diaper width direction between the opening edge portions 82 and 82 of the pair of leg openings 8 and 8). , The abdominal side of the opening edge portion 82 of the leg opening 8 at a point P on the opening edge portion 82 of each leg opening 8, which is located at a portion where the high width L is minimized. It is preferable that ratio (L1 / L3) of the distance (L3: distance measured along the diaper width direction) to the virtual straight line La of the diaper longitudinal direction passing through the disadvantage (Q) of (A) side is 2.0-2.5. And it is more preferable that it is 2.2-2.4.

By setting the ratio L1 / L3 within the above range, it becomes a shape that is more suitable for the curved shape of both legs open to the left and right, such as a baby in a state of immediately lying down, especially a low moon age baby.

In addition, as shown in FIG. 4, the diaper 1 is surrounded by an imaginary straight line Lb connecting the point P and the shortcomings Q, and an opening edge portion 82 of the leg opening 8. The leg opening part 8 is orthogonal to the virtual straight line Lc of the diaper longitudinal direction passing through the said point P, and the virtual straight line Lc, and making the area of the distorted circular area | region H into S1. The area of the virtual straight line Ld of the diaper width direction passing through the upper end part Q of the diaphragm width direction, and the area | region (the area which added the area | region H and the area | region J) of the right triangle shape enclosed by the said virtual straight line Lb is S2. It is preferable that it is 0.45-0.55, and, as for the area ratio (S1 / S2) of both areas at the time of setting it, it is more preferable that it is 0.46-0.50.

By setting the ratio S1 / S2 within the above range, it is easier to pass the baby's foot through the leg opening when the diaper is attached, and it is easier to pull up after passing the foot.

Moreover, as for the diaper 1 of this embodiment, the minimum value L1 of the high width L is about 150-170 mm, and the said distance L2 is about 75-95 mm. By setting L1 / L2 to the above-mentioned range and setting L1 and L2 to this range, a leg of a body shape such as a low moon age child can pass more easily. In particular, when it comes to L2, the excreta is less likely to leak from the leg opening.

In addition, it is preferable that the distance L3 is about 65 to 75 mm, the area S1 is about 13.5 to 19.0 cm 2, and the area S2 is about 25.0 to 35.0 cm 2, because it fits comfortably against the wearer's leg. .

The diaper 1 of this embodiment has the virtual straight line Le which connects the said point P and the disadvantage Q 'of the side of the back side part B of the opening edge part 82 of the leg opening part, and its leg, The area of the distorted circular region K surrounded by the opening edge portion 82 of the opening is S3, the virtual straight line Lc in the diaper longitudinal direction passing through the point P, and the virtual straight line Lc. Of the virtual straight line Lf in the diaper width direction passing perpendicular to the shortcomings Q 'and the right angled triangular region (region K and region M combined) surrounded by the virtual straight line Le. When the area is S4, the area ratio (S3 / S4) of the two regions is preferably 0.45 to 0.55, particularly 0.46 to 0.50, in that it is possible to further prevent leakage of excretion from the groin.

In particular, the diaper 1 of the present embodiment can be particularly easily coated on a low-middle-aged child in a lying down state. Although the mounting method of a diaper is not restrict | limited, The example of a preferable mounting method is shown below.

(Mounting method)

As shown in Fig. 5A, one hand is inserted into one leg opening 8, one foot is held by the hand, and the foot is removed from the leg opening as shown in Fig. 5B. And as shown in FIG.5 (c), another foot is also taken out from the other leg opening part by the same method. When both legs pass, the diaper is pulled up to the waist of the wearer as shown in Fig. 5D. In this way, the diaper 1 can be easily attached to the low-month-old infant and the like in the lying state.

According to the diaper 1 of this embodiment, since the said ratio L1 / L2 exists in the said specific range, the leg of the newborn baby in which the shape of a leg opening is immediately seen, and especially the leg which a leg is left and right opened is inserted. It is said to be very suitable.

For this reason, for example, when a diaper is attached by the above-mentioned preferable mounting method, after inserting a hand into the leg opening to hold the baby's foot, the operation of pulling the baby's foot out of the leg opening with the hand is very smooth. Can be done.

In addition, since the shape of the leg opening is particularly suitable for fitting the leg opening well to the legs of babies, especially newborns, it is sufficient for the leg circumference even if the elastic member 81 does not impart a strong contraction force to the leg opening. I can get a fitting property. Therefore, it is possible to prevent excessive pressure on the baby's legs.

In the diaper 1, part 81a of the elastic member 81 for leg pleat formation described above has side wrinkles in the trunk circumferences D1 and D2 at the abdomen A and the back side B. As shown in FIG. (90: stretch part) extends to the inside. Extending into the stretchable portion means that a part 81a of the elastic member 81 extends within the region where the elastic member 91 is disposed, specifically between the elastic members 91 adjacent to each other in the diaper longitudinal direction. It means to enter. A part 81a of the elastic member 81 may enter only the stretching part of either one of the abdominal part A and the back side part B. As shown in FIG.

In addition, as described above, the leg opening 8 is provided with leg pleats 80 along the opening edge portion of the diaper 1, and a pair of three-dimensional guards along the diaper longitudinal direction on both sides of the diaper longitudinal direction. 6B and 6B are formed. Therefore, even if the elasticity of the leg wrinkle opening is made weaker, the leak prevention effect of the excreta is high, so that the wearer can feel comfortable.

This effect can be obtained if at least a pair of three-dimensional guards are present. That is, it also appears when only one of the first three-dimensional guard and the second three-dimensional guard is present.

The tensile load (hereinafter referred to as the "extension load of the leg wrinkles") when the area where the leg wrinkles are formed to the elongation rate subtracted 20% from the maximum elongation rate is 100 to 250 cN, especially 150 to 220 cN, without any trace of rubber remaining comfortably. It is preferable in that it fits. The diaper of the present invention is sufficiently suppressed from leaking from the leg opening even if it is such a small stretch stress, for example.

The stretching load of the leg wrinkles is measured by the following method.

[Measurement method of elongation of leg wrinkles]

The part where the leg elastic member is arrange | positioned from a diaper is cut out to the required width | variety, and it extends in the direction corresponding to a diaper longitudinal direction using a tensilon tensile tester. In this embodiment, RTA-100 Co., Ltd. made by Orientec Co., Ltd. was used. Here, "a necessary width" means the minimum width required to measure the extension load of the site, and does not require more than necessary width (for example, it is unnecessary to cut out the width including the absorber). Means that.

The distance between the initial chucks is 50 mm less than the length in the longitudinal direction (the length in the natural state without stretching the elastic member, the initial length), and both ends of the sample are fitted to the chucks, respectively. Subsequently, the sample is stretched to a portion having a maximum elongation length (natural state length of the member fixing the elastic member)-10 mm under the condition of a crosshead moving speed of 300 mm / min. And the tensile load (tensile force) in the elongation rate subtracted 20% from the maximum elongation rate is calculated | required.

Next, the disposable diaper 1A as one embodiment of the second invention will be described with reference to FIGS. 3, 4, 6 and 7. In addition, the cross section along the II-II line of FIG. 7 (the cross section of the site where the minimum width is minimum) is the same as the cross section along the II-I line of FIG. 3 (the cross section of the site where the minimum width is minimum).

The disposable diaper 1A is a pants-type diaper for low-month-old children, as shown in FIG. 6. Since the diaper 1A has the same structure as the diaper 1 mentioned above, a different point mainly from the diaper 1 mentioned above or a particularly important point in 2nd invention is demonstrated, and the same point is the same. The description is omitted by adding a sign. About the point which is not specifically mentioned, the description regarding the diaper 1 mentioned above applies.

In the disposable diaper 1A, the area D 'from the longitudinal end line 44 of the absorber 4 to the upper end line 84 of the leg opening 8 in the trunk circumference D is The tensile load (hereinafter also referred to as an elongated load on the trunk circumference) when stretched to 50% of the maximum elongation in the diaper width direction is 50 to 150 cN, preferably 50 to 130 cN.

Here, "the longitudinal end line of the absorber 4" means the line which the longitudinal end part 41 (42) of the absorber 4 forms, and the line which extended it in the diaper width direction. In addition, "the upper end line of a leg opening part" means the line which connected each upper end part of a pair of leg opening part.

If the torsional load on the torso (hereinafter referred to as elongational stress on the torso) is less than 50 cN, when the baby is mounted on a relatively small baby, the tightening force is weak. have. If the elongation stress of the torso portion exceeds 150 cN / cm, there is a fear that the operation of holding the foot by inserting the hand from the leg opening and the pulling out of the foot from the leg opening may not be performed smoothly. There is also a strong pressure on the skin.

The extension load of the trunk circumference may be the range in the region D 'from at least the trunk circumference D to the groin portion (same as up to the upper end of the leg opening) from the longitudinal end portion of the absorbent body. As for the extension load measured by cutting out the whole circumference part D, it is more preferable that it is the said range.

The tensile load (sometimes referred to as extension stress) of the trunk circumference is measured by the following method.

[Method for Measuring Tensile Load of Trunk Periphery]

From the diaper to the trunk circumferential portion D, the portion D1 at which the upper end 83 region D 'of the leg opening 8 is located from the longitudinal end portion 41 of the absorbent body 4 to the ventral side; The part D2 located in the back side part is cut out in the state of the ring shape connected, and this is used as a sample. On the other hand, when the distance from the opening edge part 72 of the waist opening part to the longitudinal end parts 41 and 42 of the absorber 4 differs in a ventral part A and a back side part B, the back side part B is Regardless of the position of the longitudinal end 42 of the absorbent body at the same position, the same range (the waist) in the ventral part A and the ventral part B is based on the position of the longitudinal end 41 of the ventral part A. The range from which the distance from the opening edge part 72 of an opening part is the same) is cut out.

The sample is mounted on a horizontal surface so that one side (side forming the diaper outer surface) of the portion located on the ventral side abuts on the horizontal surface, and between both ends of the sample in a naturally contracted state ( The length of the gap between the left and right side seal portions is measured to be the initial length.

And the sample is fixed to the chuck | zipper between tensilon tensile tester (The product made by Orientec, Inc., "RTC-1150A"), and it extends | stretches in the same direction as the diaper width direction at the speed of 300 mm / min.

 And the sample size shown in FIGS. 7 and 4 from an initial length (same as the dimension in a diaper development and an extended state, but the trunk circumference D1 of the abdominal part A and the trunk circumference of the back side B) Elongation rate [(length after extension-initial length) / initial length x100] when extending | stretching to the part (D2) whose design dimensions differ from the other (D2) is made into the maximum elongation rate, and elongates to 50% elongation rate of the maximum elongation rate. The tensile load at the time of making it is calculated | required.

In the diaper 1A, as shown in FIG. 4, it is preferable that the said ratio L1 / L3 is 2.0-2.5, and is 2.2-2.4.

When the ratio L1 / L3 is less than 2.0, it is easy to think that it is preferable because the height is small and the leg opening is large, so that the leg is easily passed through, and it is easy to coat in a laid state. It becomes easy to leak from If the value is 2.2 or higher, it becomes very difficult for the excretion to leak. If the ratio (L1 / L3) exceeds 2.5, the width of the liver is widened, so that the excrement becomes difficult to leak, but it is difficult for the low-middle-aged child to pass the leg through the leg opening because it is bent in the shape of <, and it is difficult to lay it down. Lose. When this value is 2.4 or less, since the mountability with respect to a low moon age infant improves more and does not impair the motility at the time of attachment, it is preferable.

In addition, as shown in FIG. 4, the diaper 1A is surrounded by an imaginary straight line Lb connecting the point P and the shortcomings Q, and an opening edge portion 82 of the leg opening 8. The leg opening part 8 is orthogonal to the virtual straight line Lc of the diaper longitudinal direction passing through the said point P, and the virtual straight line Lc, and making the area of the distorted circular area | region H into S1. The area of the virtual straight line Ld of the diaper width direction passing through the upper end part Q of the diaphragm width direction, and the area | region (the area which added the area | region H and the area | region J) of the right triangle shape enclosed by the said virtual straight line Lb is S2. The area ratio (S1 / S2) of both regions at the time of using is 0.45 to 0.55, and preferably 0.46 to 0.50.

If the ratio (S1 / S2) is less than 0.45, the excrement becomes difficult to leak because the leg opening becomes smaller, but it is difficult for the low-middle-aged children to pass through the leg opening because the legs are bent in a <shape, Becomes difficult. On the other hand, when the ratio S1 / S2 exceeds 0.55, the leg opening becomes large, so that the leg is easy to pass through and easily coated in a laid state, while feces easily leak from the leg opening.

In addition, the minimum value L1 of the high width L is preferably 150 to 170 mm in order to make the legs easy to pass and to coat, and the area S1 is about 13.5 to 19.0 cm 2, and the area S2. It is preferable that it is about 25.0-35.0 cm <2>.

The diaper 1A of the present embodiment can also be easily applied to a low-month-old baby who is directly laid down by the same method as the diaper 1 described above.

According to the diaper 1A of this embodiment, when the diaper load of the torso part is in the said specific range, for example, when diaper is attached by the above-mentioned preferable mounting method, it inserted in the diaper through the leg opening part. Since the hand can easily extend the torso of the diaper, and the free movement of the hand is not prevented by the pressure from the torso, the operation of inserting the hand from the leg opening and holding the foot can be performed very smoothly. Can be. In addition, since the leg opening has a particular shape, the operation of pulling out the hand while holding the foot can be performed smoothly, and the baby during wearing is more likely to move the foot, thereby reducing the burden on the baby.

In addition, the tensile load of the torso circumference is in the above specific range, thereby exhibiting good fit for a wide range of babies from a relatively small baby to a relatively large baby. That is, even when the circumferential length of the torso is applied to the baby whose standard circumference is smaller than the standard circumferential length, the decrease in the tightening force is relatively slow, and the shortage of the tightening force can be prevented. The increase in tightening force is relatively slow, and excessive tightening and deterioration of operability at the time of attachment can be prevented.

In addition, in the diaper 1A, a part 81a of the elastic member 81 for leg pleat formation described above extends into the side pleats 90 (stretch and extend part) in the trunk circumferential portion D. As shown in FIG. Extending into the stretchable portion means that a part 81a of the elastic member 81 enters the region where the elastic member 91 is disposed, specifically between the elastic members 91 adjacent to each other in the longitudinal direction of the diaper. It means to be.

The diaper 1A is a diaper having a tensile load (hereinafter referred to also as an elongation stress at the waist) of 100-250 cN, particularly 130-200 cN when the waist E is stretched to 50% of the maximum elongation in the diaper width direction. It is preferable at the point which makes it easy to raise and balances the characteristic which does not peel off easily. The elongation stress at the waist is cut out of the diaper while the waist E is in a ring-shaped state in which the part E1 located at the abdominal side A and the part E2 located at the back side B are connected. Except for making it, it measures by the method similar to the elongation stress of a trunk periphery part.

In addition, when the leg wrinkle portion 80 is stretched to 50% of the maximum elongation in the diaper longitudinal direction, the tensile load (hereinafter referred to as the stretching stress of the leg wrinkles) is 50 to 200 cN, particularly 80 to 150 cN. It is preferable in terms of making fit compatible with those which can easily pass the foot of the.

The elongation stress of the leg portion is measured by the same method as the elongation stress of the torso circumference, except that the portion where the leg elastic member is disposed is cut out from the diaper to the required width and sampled. Here, "a necessary width" means the minimum width required to measure the elongation load of the site, and does not require a width larger than necessary (for example, it is unnecessary to cut out the width including the absorber). Means.

In addition, the diaper 1A is the opening of the leg opening 8 at the point P on the opening edge part 82 of each said leg opening 8 located in the site | part where the high width L is minimum. The distance (L2: see FIG. 4) measured along the diaper longitudinal direction of the distance to the shortcomings Q at the side of the abdomen A of the edge portion 82 is 75 to 95 mm. It is easy to make it, and it is especially preferable at the point which becomes difficult to leak feces in a leg opening part.

As a material which comprises each part of the diaper 1, 1 'of each embodiment mentioned above, what is normally used in the said technical field can be used without a restriction | limiting in particular.

For example, as the surface sheet 2, a hydrophilic, liquid-permeable nonwoven fabric or a perforated film can be used. As the back sheet 3, a resin film, laminate materials such as a resin film and a nonwoven fabric, and the like can be used. As the absorbent body 4, a mixture of red fluff pulp and superabsorbent polymer particles wrapped with tissue paper or nonwoven fabric (hereinafter referred to as a 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, the nonwoven fabric by various manufacturing methods is used preferably.

Various well-known elastic members can be used as an elastic member of each part, For example, in the form of each elastic member, it is a thing of thread shape (silicone rubber etc.) and the thing of the strip | belt shape of a predetermined width (flat rubber etc.) And thin film-like ones. Examples of the material for forming the elastic member include natural rubber, synthetic rubbers such as styrene-butadiene, butadiene, isoprene and neoprene, EVA, stretchable polyolefin, and urethane.

It is preferable that the elastic member (90: body elastic member) to give elasticity to the body circumference has a real rubber shape, and the elastic member 81 for leg wrinkle formation is preferably a flat rubber shape, and the waist portion It is preferable that the elastic member 71 uses a flat rubber shape.

The absorbent body 4 is preferable in that it fits well with the baby's groin when the bending rigidity is 1-25 cN / 50 mm. Although bending rigidity has the rigidity of a diaper longitudinal direction, and the bending rigidity of the width direction, it is preferable that at least the bending rigidity of the width direction exists in the said range.

The bending rigidity of the absorber 4 can be measured by the following method.

[Measuring Method of Bending Stiffness]

The measurement was carried out using a tensilon tester (RTC-1150A manufactured by Orientec Co., Ltd.) in accordance with the JIS standard K7171 method (test method for plastic-bending characteristics) (R1 = 5.0 ± 0.1mm, R2 = 5.0 ± 0.2 mm).

The test piece is placed between both edges of the support having an edge span interval L of 50 mm, and the indenter tip is placed so as to barely contact the test piece. The indenter is lowered under the conditions of a load cell of 5 kg (range 200 cN) and a speed of 30 mm / min to obtain a load-deflection curve. The maximum value of the obtained bending stress is made into bending rigidity value (cN / 50mm).

[Production Method of Test Piece]

The test piece obtains the absorber containing a packaging material from an absorbent article, and cuts it in the rectangular shape which is 50 mm in a diaper longitudinal direction and 80 mm in a width direction in the longitudinal direction and the width direction center part. 50 mm in the unit of bending stiffness value is the length of the short side of a test piece, and is the width of the test piece bent by an indenter at the time of a test. The test piece is hypothesized between both edges by matching the long side to the direction from one edge to the other edge. When the bending rigidity of the diaper width direction is measured, the test piece of diaper length direction 80mm and the width direction 50mm is cut out. 50 mm in the unit of the bending stiffness value, when the absorbent containing the earth can not be obtained from the absorbent article as the test piece, the stiffness value including the material such as non-woven fabric, film, etc. and the stiffness value of each material is measured and the absorber from the value The absorber stiffness value is obtained by calculating the stiffness value of.

As mentioned above, although preferred embodiment of 1st and 2nd invention was described, 1st and 2nd invention is not limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of each invention. In addition, although the diaper 1 and 1A mentioned above are 50-220 mm in length on a groin for low-middle-aged children, the disposable diaper of this invention (1st and 2nd invention) may be a diaper-aged diaper or an adult diaper. have. In the case of a diaper for the elderly, it is preferable that the groin length is 100 to 300 mm. In the case of an adult diaper, the groin length is preferably 200 to 500 mm.

In addition, the requirement which a description abbreviate | omitted in one embodiment mentioned above and only one embodiment can apply suitably to each other embodiment, Moreover, the requirements in each embodiment can be mutually substituted between embodiments suitably. .

The disposable diaper of the present invention (first and second inventions) can prevent leakage around the legs even if the legs are not tightened excessively, and the baby's feet are easily passed through the leg openings when the diaper is attached. It is possible to easily coat the baby. The disposable diaper of the present invention is not limited to low-month-olds, but is particularly suitable for low-month-olds, and has the advantage that it can be easily applied to newborns and the like lying down.

The present invention is explained in more detail by the following examples.

(A) Embodiment of the First Invention

<Example 1>

The disposable diaper of the form shown in FIGS. 1-3 was manufactured.

Table 1 shows the dimensions and physical properties of each part.

L1 L2 L1 / L2 L3 L1 / L3 L4 S1 S2 S1 / S2 Elongation load of leg folds 160 mm 85 mm 1.9 70 mm 2.3 205 13.8 29.7 0.46 200 cN / cm

Comparative Example 1

A diaper was manufactured in the same manner as in Example 1 except that the ratio L1 / L2 was set to 1.5 (L1 = 160 mm, L2 = 107 mm).

<Reference Example>

A diaper was manufactured in the same manner as in Example 1 except that the ratio L1 / L2 was set to 2.3 mm (L1 = 160 mm, L2 = 107 mm).

<Performance evaluation>

For each disposable diaper, 1) ease of attachment to the newborn and 2) urine prevention performance from the crotch of the urine were evaluated by the following methods, respectively. The results are shown in Table 2.

1) Ease of mounting (evaluation of whether it is easy to pass the foot)

[Assessment Methods]

Each diaper was attached to a newborn model (with a leg bent in the shape of <in a political aspect) by the mounting method described above, and the ease of passage when passing the foot through the leg opening in the lying state was evaluated.

(Evaluation standard)

When passing a foot, it was set as (circle) if it was easy to pass and x when it was difficult to pass.

To be easy to pass means that both feet are easy to pass and, in particular, can pass smoothly when passing one foot after passing the other. Difficult to pass means that both feet are difficult to pass but are particularly difficult to pass when passing one foot after passing the other.

2) gland prevention performance from urine leg crotch (measurement of leg crotch value)

[Assessment Methods]

Diaper was attached to the low-middle age model (model that can inject artificial urine in the groin and formally mimics the waist of low-middle age infant), and measured crotch glands in the following manner.

In the measurement of the crotch leakage value, the diaper is first mounted on the low-middle age model, and is first set to the side of 90 °, and then fell to the back of 45 ° as it is. 30 g of artificial urine was injected at a rate of 5 g / sec through the tube, and it was visually checked whether it leaked or not after the injection. For the non-leak, an additional 40 g of artificial urine was injected in the same manner, and this operation was repeated until it leaked. And the total infusion amount of artificial urine at the time when urine leak was observed was made into leg crotch value.

Example 1 Comparative Example 1 Reference Example Ease of foot passage ○ easy to pass both feet ○ easy to pass both feet X difficult to pass Leg crotch spring value (g) 180 g 120 g 120 g

The results shown in Table 2 show that the disposable diaper of Example 1 is easy to pass the baby's foot and does not leak easily from the leg crotch. On the other hand, the diaper of Comparative Example 1 is easy to pass the baby's foot, but a gap is easily formed in the leg crotch portion and is easy to leak. The diaper of the reference example does not leak well, but it is difficult to pass the baby's foot because it is difficult to pass the other leg after passing one leg.

(B) Embodiment of the Second Invention

<Example 2>

The disposable diaper of the form shown in FIG. 3, FIG. 6, and FIG. 7 was manufactured.

Table 1 shows the dimensions and physical properties of each part.

L1 L3 L1 / L3 S1 S2 S1 / S2 160 mm 70 mm 2.3 13.8㎠ 29.8cm2 0.46 Body girth extension load Waist extension load Leg crease Absorber Stiffness (Diaper Width) L4 85 cN 160cN 95 cN 16.4cN / 50mm 205 mm

Comparative Example 2

A diaper was manufactured in the same manner as in Example 2 except that the elongation stress of the trunk circumference was 200 cN.

Comparative Example 3

Disposable diapers were produced in the same manner as in Example 2 except that the ratio L1 / L3 and the ratio S1 / S2 were set to 3.0 and 0.35 in that order.

<Performance evaluation>

Each diaper of Example 2 and Comparative Examples 2 and 3 was evaluated by the following method about 3) the ease of attachment to low-middle-aged infants, and 4) the diaper slipping off. The results are shown in Table 2.

3) ease of mounting

[Assessment Methods]

Each diaper was attached to a low-middle age model (with a leg bent in the shape of <in a political aspect) by the above-described mounting method, and the passage and ease of passage when passing the foot through the leg opening in a lying state. The ease of pulling up the diaper in the lying down state was evaluated.

(Evaluation standard)

When it was coated, it was easy to pass the foot, and then the diaper was easy to pull up, and the foot was difficult to pass. However, when the diaper was easy to pull up, △, the foot was difficult to pass, and it was difficult to pull up.

4) shifted and peeled off

[Assessment Methods]

The model of the low moon age (with the legs bent in the shape of <in a politic aspect) is fitted with each diaper with the circumferential edge of the waist opening aligned with the position of the navel and the chest of the model is fixed to the bench. Measure the amount of the diaper slipping and peeling (distance from the belly) when the feet are lifted and kicked (movement peculiar to low moon age) 20 times.

Example 2 Comparative Example 2 Comparative Example 3 Ease of Mounting ○ × △ The amount that comes off 10 mm 10 mm 20 mm

The results shown in Table 4 show that the disposable diaper of Example 2 is easy to pass through the feet of low-middle-aged children, is easy to be pulled up in a laid-down state, and does not slip off easily. On the other hand, although the diaper of the comparative example 2 does not shift | deviate well, it is difficult to apply it, and it turns out that the diaper of the comparative example 3 is difficult to apply and displaces easily.

The present invention particularly provides a pants-type diaper which can be suitably used for low age children.

1 is a perspective view showing a disposable diaper as an embodiment of the first invention.

FIG. 2 is a plan view showing the development and the extended state of the disposable diaper of FIG. 1. FIG.

FIG. 3: is a schematic cross section which shows the cross section (section of the site | part at which the height width becomes minimum) along the II line of FIG. 2, and the cross section along the II-II line of FIG.

It is a top view for demonstrating the external shape of the disposable diaper shown in FIG. 1 and FIG.

5 (a) to 5 (d) show a state in which the disposable diaper shown in FIGS. 1 and 6 is attached to a newborn baby (low moon age child), and FIG. 5 (a) shows the diaper from the outer surface side. 5 (b) is a state in which a hand is inserted into one leg opening, and a state of holding the baby's foot lying on the floor with the hand is taken out from one leg opening, and (c) is another The state which pulled out a foot from the other leg opening part by the same method and FIG. 5 (d) is a figure which shows the state which pulled up a diaper and completed installation.

Fig. 6 is a perspective view showing a disposable diaper as one embodiment of the second invention.

FIG. 7 is a plan view showing the development and extension of the disposable diaper of FIG. 6. FIG.

Claims (10)

A pants-type disposable diaper having a liquid retaining absorbent body, having a ventral portion, a groin portion, and a back side portion, and having a waist opening and a pair of leg openings, Q on the ventral side of the opening edge portion at the point P on the opening edge portion of each leg opening, which is located at the minimum value L1 of the high width portion and the portion where the high width width is minimum. Disposable diapers having a ratio L1 / L2 of 1.7 to 2.2 in the longitudinal distance L2. The ratio L1 of the minimum value L1 of the said high width | variety and the distance L3 from the said point P to the virtual straight line La of the diaper longitudinal direction passing through the said disadvantage Q. Disposable diaper with / L3) of 2.0 to 2.5. The area | region of the area | region enclosed by the opening edge part of the said leg opening part, the virtual straight line Lb which connects the said point P and the said disadvantage Q, and S1, the point P of Claim 1 or 2 Surrounded by the virtual straight line Lc in the diaper longitudinal direction passing through the diaper, the virtual straight line Ld in the diaper width direction passing through the shortcomings Q at right angles to the virtual straight line Lc, and the virtual straight line Lb. The disposable diaper having an area ratio (S1 / S2) of the two regions when the area of the region is S2. The said periphery part and the torso circumference part in the said back side part have the elastic part which expands and contracts in the diaper width direction, and the said leg opening part has wrinkles in the said leg opening part along the opening edge part. A disposable diaper, which is formed, wherein a part of the leg wrinkle forming elastic member extends into the stretch portion of the trunk circumference portion at the abdomen and / or the belly side. The leg opening is formed in the said leg opening part along the opening edge part, The site | part in which this leg wrinkle was formed is extended | stretched to the elongation rate which subtracted 20% from the maximum elongation rate, The said leg opening part. Disposable diaper with a tensile load of 100 to 250 cN / cm. 6. The leg opening according to any one of claims 1 to 5, wherein leg openings are formed along the edges of the legs, and at least one pair of three-dimensional guards are formed along both sides of the diaper in the longitudinal direction. Disposable diapers. In the pants-type disposable diaper which has a liquid retaining absorbent body, and has a ventral part, a groin part, and a back side part, and a waist opening part and a pair of leg opening parts are formed, The trunk circumference has elasticity in the circumferential direction, and the area from the longitudinal end line of the absorber to the upper end line of the leg opening in the trunk circumference is extended to 50% of the maximum elongation in the diaper width direction. Tensile load is 50-150cN, Passes the shortcomings Q on the ventral side of the opening edge at the point P on the opening edge of each leg opening, which is located at the minimum value L1 of the high width and at the portion where the high width is minimum. The ratio L1 / L3 of the distance L3 to the virtual straight line La in the diaper longitudinal direction is 2.0 to 2.5, The virtual straight line Lb connecting the point P and the shortcomings Q, and the area of the area enclosed by the opening edge portion of the leg opening S1, and the virtual straight line in the diaper longitudinal direction passing through the point P ( Lc, the virtual straight line Ld in the diaper width direction passing through the shortcomings Q perpendicular to the virtual straight line Lc, and the area when the area of the area surrounded by the virtual straight line Lb is S2. Disposable diaper with an area ratio (S1 / S2) of both regions being 0.45 to 0.55. The disposable diaper according to claim 7, wherein the waist has elasticity in the circumferential direction thereof and has a tensile load of 100 to 250 cN when the waist portion is stretched to 50% of the maximum elongation in the diaper width direction. 9. The leg opening according to claim 7 or 8, wherein a leg wrinkle is formed along the edge portion of the leg opening, and the tensile load when the leg wrinkle is stretched to 50% of the maximum elongation in the diaper longitudinal direction is from 50 to 10. Disposable diapers with 200 cN. As a mounting method of the disposable diaper of Claim 1 or 7, Insert one hand into one leg opening, grasp one foot of the wearer with the hand, pull the foot out of the leg opening, and withdraw the other foot from the other leg opening, then remove the diaper from the waist of the wearer. The mounting method of a disposable diaper which mounts a disposable diaper to a wearer in a lying state by pulling up to the side.