JP2004049709A - Pants type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type disposable diaper which achieves an excellent spillage prevention performance with an absorption capacity enough to absorb a large amount of excrement. <P>SOLUTION: This pants type disposable diaper has a liquid permeable surface sheet, a liquid impermeable rear sheet, a liquid retaining absorbor body disposed between both the sheets and an outer layer sheet which has a pair of left and right leg opening parts and the absorbor body disposed inside the leg opening parts across the width of the diaper to determine the outline of the diaper. Both side rims of the belly side part are fastened respectively on both side rims of the back side part leaving the pair of opening parts. When the length of each leg opening part on the outer layer sheet along the length thereof should be (a) and the maximum width of the leg opening part (b), (a/b) is 3.3 or more. The distance to the side rim of the absorbor body from the point positioned innermost across the width thereof should be 40 mm or less out of the side rim of the outer layer sheet at the crotch part, and the side rim part at the crotch part of the absorbor body is bent to the side of the rear sheet during the wearing of the diaper. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a pants-type disposable diaper that can significantly prevent leakage from around a foot.
[0002]
[Prior art]
Conventionally, in a pants-type disposable diaper, the shape of the leg opening of the diaper has been formed to be deep in the width direction in order to enhance the wearability of the diaper. The leg opening having such a shape inevitably leads to a reduction in the width inward of the crotch portion of the absorber main body in the width direction. However, since the absorption amount of the diaper is determined by the volume of the absorber main body, in such a pants-type disposable diaper in which the width inward of the absorber main body in the crotch portion is not sufficiently secured, the absorption amount is reduced. There was a problem that it was insufficient.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and in a pants-type disposable diaper, pants having an absorption amount capable of absorbing a large amount of excrement and having excellent performance of preventing leakage from a crotch portion. The main purpose is to provide disposable diapers.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an absorbent body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber disposed between these two sheets, A pair of leg openings, wherein the absorbent body is disposed inward of the diaper in the width direction of the leg openings, and an outer layer sheet defining an outer shape of the diaper; and both sides of a ventral side of the outer layer sheet. In a pants-type disposable diaper in which the edges and both side edges of the back side are fastened together leaving a pair of leg openings, the minimum width of the absorber main body at the crotch of the pants-type disposable diaper is 250 mm or more. The above object has been achieved by providing a pants-type disposable diaper which is within a range of 350 mm, and a side edge portion at a crotch portion of the absorber main body is bent toward a back sheet side when worn. It is intended.
[0005]
In the present invention, a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber body having a liquid-retaining absorber disposed between these two sheets, and a pair of left and right leg openings are provided. The absorbent body is disposed inside the width direction of the diaper of the leg opening, and has an outer layer sheet that defines the outer shape of the diaper. In a pants-type disposable diaper having both sides and a pair of leg openings fixed thereto, leaving a pair of leg openings, the length in the longitudinal direction of the leg openings of the outer layer sheet is a, and the maximum width of the leg openings is Assuming that b, a / b is 3.3 or more, and a distance from a point located most inward in the width direction to a side edge of the absorber main body among side edges of the outer layer sheet in the crotch portion is 40 mm or less. Yes, on the crotch of the absorber body Side edges that are intended to provide a pants-type disposable diaper being characterized in that so as to bend to the backsheet side when worn.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the pants-type disposable diaper of the present invention will be described.
[0007]
In the pants-type disposable diaper of the present invention, the minimum width of the absorbent body in the crotch region is in the range of 250 mm to 350 mm, and in particular, by providing a wide absorbent body in the range of 270 mm to 310 mm, a large amount of the absorbent body is provided. The amount of absorption that can absorb excrement is realized. Furthermore, in the present invention, since the side edge portion at the crotch portion of such an absorber main body is bent toward the outer surface side of the diaper at the time of wearing and abuts against the inner side of the thigh of the wearer, the excretion leaked from the crotch portion The thing is absorbed by the absorber main body in this part, and the pants-type disposable diaper excellent in the performance of preventing leakage from the crotch can be obtained.
[0008]
Preferred embodiments of the pants-type disposable diaper of the present invention include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body having a liquid-retentive absorbent body disposed between these sheets. A main body, a pair of left and right leg openings, wherein the absorber main body is disposed inward of the leg opening in the width direction of the diaper, and has an outer layer sheet defining an outer shape of the diaper; In a pants-type disposable diaper in which both side edges of a side portion and both side edges of a back side portion are fastened together leaving a pair of leg openings, the length of the outer layer sheet in the longitudinal direction of the leg openings is a Assuming that the maximum width of the leg opening is b, a / b is 3.3 or more, and the absorber main body starts from a point located most inward in the width direction among side edges of the outer layer sheet in the crotch portion. Distance to side edge of And at 40mm or less, the side edge portion in the crotch portion of the absorbent body may include a pants-type disposable diaper being characterized in that so as to bend to the backsheet side when worn.
[0009]
In such a pants-type disposable diaper, by making the shape of the leg opening narrow in the width direction and lengthening in the longitudinal direction, it is possible to form a wide inward width in the crotch portion of the outer layer sheet. Become. Therefore, also in the absorber main body arranged inside the outer layer sheet and covered with the outer layer sheet, it is possible to secure a large width inward in the width direction at the crotch, so that a large amount of excrement can be absorbed. It retains the possible absorption.
[0010]
Hereinafter, one embodiment of such a pants-type disposable diaper of the present invention will be described in detail with reference to FIGS.
[0011]
First, FIG. 1 is a perspective view showing an example of a pants-type disposable diaper of the present embodiment in a worn state, and FIG. 2 is a plan view showing an example of a development view of the pants-type disposable diaper of the present embodiment. is there. 3 and 4 are plan views showing other examples of the bending means in the pants-type disposable diaper of the present embodiment. FIG. 5 is a schematic sectional view taken along line XX of FIG. 2, and FIG. 6 is a schematic sectional view showing another example of the side absorption region in the present embodiment.
[0012]
First, as shown in FIG. 1, a pants-type disposable diaper 1 of the present embodiment has a waist opening 2 and a pair of left and right leg openings 3, and the abdominal part A and the back part B of the diaper 1. Is formed as a pants-type disposable diaper 1 by being overlapped at each of the left and right side portions and joined by a joining line 4. As the joining means at this time, known joining means can be used, and examples thereof include heat sealing, high-frequency sealing, and ultrasonic sealing.
[0013]
In addition, an absorber main body 33 having an absorber disposed between the liquid-permeable top sheet and the liquid-impermeable back sheet is arranged from the abdominal part A to the crotch part C and further to the back part B. . In the present embodiment, by providing the inner width of the outer layer sheet 8 defining the outer shape of the diaper wider in the width direction at the crotch portion, the absorber body 33 disposed inside the outer layer sheet 8 also has the same structure. It is possible to secure a wide width inward in the width direction at the crotch part.
[0014]
The outer layer sheet 8 in the present embodiment is not particularly limited as long as it determines the outer shape of the diaper. For example, the outer layer sheet 8 is formed of a single sheet or a sheet formed by joining a plurality of sheets. It may be. Further, another sheet can be superimposed on the outside of the outer layer sheet.
[0015]
Moreover, in the absorber main body 33 in this embodiment, the side edge part of the crotch part C bends to the outer surface side of the diaper at the time of wearing, and abuts on the inner side of the wearer's thigh. A part of the absorber main body 33 is referred to as a leg flap absorber 7. By providing the leg flap absorber 7 in this way, the excrement leaked from the crotch portion is absorbed by the leg flap absorber 7, so that the performance of preventing leakage from the crotch portion can be greatly improved. is there.
[0016]
In addition, the waist opening 2 is provided with a plurality of waist elastic members 2a for forming waist gathers at predetermined intervals along the edge of the waist, and an annular waist substantially continuous over the entire circumference. Gathers are formed. A plurality of waist-periphery elastic members 2b are arranged at predetermined intervals in the width direction of the diaper 1 in the waist-peripheral portion D in each of the abdominal portion A and the back-side portion B. As shown in FIG. 1, the waist peripheral portion D is below the position where the waist elastic member 2a is arranged and above the leg opening 3 when the waist opening 2 is directed upward. It is a part located in.
[0017]
Each of the waist peripheral elastic members 2b is disposed and fixed in an extended state so that elastic elasticity is developed, at least at positions outside the positions of both side edges 7c of the absorber main body. At least in the width direction central portion M of the portion where the absorber main body 33 exists, the waist periphery elastic member 2b is not arranged, or the width direction central portion M does not exhibit elastic elasticity. Has been done. An elastic member is disposed when it does not exhibit elastic elasticity, but in that portion, the elastic elasticity has disappeared due to the heat and pressure treatment of a heat sheet or the like, or the elastic state has been released when the stretched state is released. Is not expressed.
[0018]
FIG. 2 is an example of a development view in which the diaper according to the present embodiment is extended back and forth. First, FIG. 2 shows the leg opening 3 which is a portion that comes into contact with the wearer's foot. In the present embodiment, by adjusting the shape of the leg openings 3, it is possible to increase the width of the outer layer sheet 8 in the width direction in the crotch portion C of the outer layer sheet 8.
[0019]
In the leg opening 3 of the present embodiment, assuming that the length of the leg opening in the longitudinal direction is a and the maximum width is b, the lower limit of the numerical value represented by a / b is 3.3 or more. It becomes. Further, among them, it is preferable to be 3.5 or more. On the other hand, the upper limit is preferably 7.0 or less. If it is within the above range, the shape of the leg opening can be formed narrow in the width direction and wide in the longitudinal direction without impairing the wearability to the wearer, and thereby, the width direction inward in the crotch portion of the outer layer sheet can be formed. This is because the width is secured wide, and a wide absorbent body can be provided.
[0020]
Further, as shown in FIG. 2, the absorber main body 33 is disposed over the abdominal part A, the crotch part C, and the back part B of the outer layer sheet 8. The distance from the point located most inward in the width direction to the side edge 7c of the absorber main body 33 among the side edges 8a of the outer layer sheet 8 in the crotch C, for example, L1 shown in FIG. It is preferable that it is in the range of 0 mm to 20 mm. By arranging the absorber main body within the above range, it is possible to sufficiently secure the width inward in the width direction at the crotch part of the absorber main body.
[0021]
Further, the minimum width of the absorber main body at the crotch is preferably in the range of 250 mm to 350 mm, and more preferably in the range of 270 mm to 310 mm. In the present embodiment, by forming the inner width in the width direction at the crotch portion of the outer layer sheet wide, it is possible to use a wide absorbent body within the above range. Further, by using the absorbent body having a width within the above range, an absorption amount capable of absorbing a large amount of excrement can be realized.
[0022]
The shape of such an absorbent body is not particularly limited as long as it can absorb excrement. Specifically, as shown in FIG. 2, the shape may be an elongated rectangular shape, an hourglass shape (not shown), a trapezoid, or the like.
Moreover, the absorber main body in this embodiment bends to the outer surface side of the diaper so that the side edge part in the crotch part contacts the wearer's thigh inside. If the absorber body of the portion which is bent in this way and abuts on the inner side of the thigh of the wearer is a leg flap absorber, the maximum width of the inner width in the width direction of the leg flap absorber is within a range of 10 mm to 100 mm, Among them, it is preferable to be within the range of 40 mm to 60 mm. This is because if the leg flap absorber has a width within the above range, the absorption performance and the absorption amount for sufficiently preventing leakage from the crotch can be maintained.
[0023]
The length of the leg flap absorber in the longitudinal direction, specifically, L4 shown in FIG. 2, is 1/5 to the longitudinal length of the diaper, specifically, L5 shown in FIG. It is preferably in the range of 2/3, and especially in the range of 1/4 to 1/2. Within the above range, the leg flap absorber easily bends in such a manner that the leg flap absorber hits the inside of the thigh of the wearer with a sufficient length at the time of wearing. Because it is even higher.
[0024]
Further, in the present embodiment, a bending means may be provided at least in the crotch part in order to facilitate bending when forming the above-described leg flap absorber.
[0025]
Here, the term “bending means” means a means that enables the absorber main body to be bent when a part of the absorber main body is bent to become a leg flap absorber.
[0026]
Such a bending means is not particularly limited as long as it can be bent. However, in this embodiment, since it is preferable to bend the absorber main body at a desired position, it is preferable to use a bending means for facilitating such bending. For example, a means using an elastic member, a means for performing embossing, a means for providing a low rigidity region, and the like can be given. Further, even when such a means is used alone, it is possible to bend at a desired position, but by using it in combination, its flexibility can be further enhanced. Among such combinations, particularly, a combination of an elastic member and embossing, and a combination of an elastic member and a low rigidity region are preferable. This is because the elastic member also ensures the fit, and the interaction between the two bending means makes it easy to bend at a desired position. Further, a case where all the bending means of the elastic member, the embossing, and the low rigidity region may be combined.
[0027]
Hereinafter, these methods will be described in detail.
[0028]
First, means using an elastic member will be described. The elastic member has a fold at a position where the elastic member is arranged to receive the elongation stress by the elongation stress of the elastic member, so that the absorber main body can be easily bent at a desired position. Here, the elastic member provided as the bending means is referred to as a leg elastic member.
[0029]
First, the position where the leg elastic member is disposed is not particularly limited as long as the elastic member is disposed along the pair of left and right leg openings. Specifically, one end located on the abdominal side and the other end located on the dorsal side of each leg elastic member are both abdominal and dorsal sides relative to the side edge of the absorber body. And the center part of each leg elastic member is curved so as to pass more inward in the width direction than the side edge of the absorber main body at the crotch of the diaper. Shape can be mentioned. Among these shapes, in order to improve the wearability of the diaper around the wearer's feet, as shown in FIG. 2, each end 6a of the leg elastic member 6 is provided with a diaper abdomen A and It is preferable to reach the side edge of the outer layer sheet 8 in the back side portion B. On the other hand, it is preferable that the central portion of the leg elastic member 6 is located further inward in the width direction than the side edge 7c of the absorber main body 33 so that the width of the leg flap absorber 7 can be secured. This is because the region of the absorber main body 33 located outward in the width direction of the diaper from the position where the leg elastic member 6 is disposed becomes the leg flap absorber 7.
[0030]
Here, the central portion of the leg elastic member refers to a portion excluding both end portions of the leg elastic member, and at least a part of the central portion of the leg elastic member extends inward in the width direction from the side edge of the absorber main body at the crotch. I just need to go.
[0031]
The shape of the leg elastic member at the crotch portion is not particularly limited as long as it does not create a gap between the leg flap absorber and the skin of the wearer such that excrement leaks out. For example, as shown in FIG. 2, the leg elastic member on the abdominal side and the leg elastic member on the dorsal side are joined at the crotch, and a continuous shape, or similarly joined at the crotch However, each leg elastic member is broken and discontinuous near the center of the absorber body, or the abdominal leg elastic member and the back leg leg A shape in which the elastic members are separated from each other at the crotch portion without being joined can be cited.
[0032]
By arranging the leg elastic member as described above, the diaper is bent with the leg elastic member as a bending line, and the vicinity of the bent portion is well fitted to the groin. In addition, even if excrement moves from the central part of the absorber main body toward the leg flap absorber, there is also an effect that the movement is prevented by the vicinity of the bent portion, and the leakage prevention performance is further improved.
[0033]
Next, means for embossing will be described.
[0034]
Embossing refers to processing the surface of the absorber main body into an uneven shape, and by performing such embossing, the shape of the surface of the absorber main body changes and the absorber main body is easily bent.
[0035]
The region to be embossed is not particularly limited as long as it is separated from the side edge of the absorber main body at least inward in the width direction at the crotch, but the width of the above-described leg flap absorber is secured. It is preferable to apply them at a predetermined interval so that they are applied.
[0036]
Further, in the case where the leg elastic member is used in combination with the above-described leg elastic member, it is preferable to perform embossing near the position where the leg elastic member is disposed most inward in the width direction of the absorber main body. For example, as shown in FIG. 3, it is preferable to perform embossing 10 in the vicinity of the portion 6 b where each leg elastic member 6 is joined at the crotch. This is because such a region is a portion that is required to be bent most greatly. Thereby, by the interaction of the embossing and the leg portion elastic member, it is possible to easily and easily bend the absorber main body by using these bending means as folds.
[0037]
Further, as a method of performing embossing, it is possible to perform embossing by a method of crimping the absorber main body with an embossing roll. As the embossing roll to be used, a pair of rolls generally including an engraving roll and a smoothing roll are used. Is used. As the engraving roll, for example, an iron roll having various patterns engraved on its surface can be used. On the other hand, as the smoothing roll, for example, a paper roll, a cotton roll, a rubber roll, an iron roll, and the like can be used.
[0038]
In such an embossing roll, the absorbent body before embossing can be preheated by a heating roll. In addition, the embossing roll itself can be heated, and the absorbent body can be interposed between the heated rolls for embossing. At the time of heating, the temperature of the embossing roll is preferably set to a temperature lower than the melting point of the material for forming the absorber main body by 10 ° C. or more. Further, the linear pressure at the time of embossing depends on the thickness of the absorbent body to be embossed, the heating temperature, and the traveling speed, but is generally in the range of 5 to 50 kg / cm, and among them, 7 to 30 kg. / Cm is preferable.
[0039]
Next, a case where a low rigidity region is formed will be described.
[0040]
The low rigidity region means a region having lower rigidity than other regions. The region for forming such a low-rigidity region is not particularly limited as long as it is further away from the side edge of the absorber main body in the width direction of the absorber main body than the side edge of the crotch portion. It is preferable to apply at predetermined intervals so as to secure the width of the body.
[0041]
Further, when the leg elastic member is used in combination with the above-described leg elastic member, it is preferable to provide a low rigidity region near the position where the leg elastic member is disposed most inward in the width direction of the absorber main body. For example, as shown in FIG. 4, it is preferable to provide the low rigidity region 11 near the portion 6b where each leg elastic member 6 is joined at the crotch. This is because such a region is a portion that is required to be bent most greatly. Thereby, by the interaction of the low rigidity region and the leg elastic member, it is possible to easily and easily bend the absorber body by using these bending means as folds.
[0042]
Specifically, as shown in FIG. 4, the length L7 of the portion of the leg elastic member 6 in the low rigidity area 11 is 10 to 50 times the length L3 of the absorber main body 33 in the longitudinal direction. %, Among which it is preferable to form the low-rigidity region 11 so as to fall within the range of 20 to 40%. Further, the low-rigidity area is set such that the leg elastic member 6 is within the low-rigidity area 11 with respect to the length L5 of the diaper in the range of 5 to 40%, among which 15 to 30%. 11 is preferably formed.
[0043]
Each numerical value is based on the dimensions measured in the unfolded state and the tensioned state (the state where the elastic member of each part is expanded, see FIG. 4) by peeling the joint of the side part of the diaper, and is based on the leg elastic member. Is composed of multiple lines, the criterion is the same as above.
[0044]
The method for forming such a low-rigidity region is not particularly limited as long as it is a method capable of lowering the rigidity of a part of the absorber main body than the rigidity of other parts. For example, a method of hollowing out a part of the absorber into a predetermined shape, a method of making a part of the absorber lower in basis weight than other parts, a method of making a part of the absorber thinner than other parts, an absorber And the like, and a method in which one or two or more of these are combined. Among these, it is preferable to use a method in which a part of the absorber is made to have a lower basis weight than other parts, or a method in which a part of the absorber is hollowed out into a predetermined shape.
[0045]
Further, the ratio between the basis weight of the low-rigidity area and the basis weight of the absorber adjacent to the inside (low-rigidity area / inside adjacent part), and the basis weight of the low-rigidity area and the absorber basis weight of the area adjacent to the outside The amount (low rigidity area / outside adjacent part) is preferably 0 to 0.5, respectively.
[0046]
Further, the difference in basis weight of the absorber between the low rigidity region and the inner adjacent portion and the outer adjacent portion is preferably at least 100 g / m ² or more, particularly preferably 200 g / m ² or more.
[0047]
Further, other members shown in FIG. 2 will be described. First, a leg flap elastic member 20 is disposed in the vicinity of the side edge 7a of the leg flap absorber along the longitudinal direction of the absorber main body 33, and the leg flap is attached to the side edge 7a of the leg flap absorber. A leg flap side elastic member 21 is provided along the side edge 7a of the absorber.
[0048]
The leg flap elastic member 20 and the leg flap side elastic member 21 in the present embodiment are disposed from the abdominal part A to the dorsal part B, respectively.
[0049]
Next, the diaper of this embodiment will be further described with reference to FIG. FIG. 5 is a schematic cross-sectional view when the diaper of this embodiment is cut along the line XX shown in FIG.
[0050]
FIG. 5 shows an absorbent body 33 having a liquid-permeable top sheet 31, a liquid-impermeable back sheet 32, and a liquid-retentive absorber 5 interposed between these two sheets 31, 32; The outer layer body 34 to which the absorber main body 33 is bonded is located outside the absorber main body 33 (on the outer surface side of the diaper).
[0051]
Further, the leg flap elastic member 20 is disposed along the longitudinal direction of the diaper on the diaper outer surface Q side of a portion located outside the outer edge of the low rigidity region 11. On the other hand, the leg flap side elastic member 21 is disposed along the side edge 7 a of the leg flap absorber 7.
[0052]
By providing the leg flap elastic member 20 or the leg flap side elastic member 21 in this manner, it is possible to further improve the adhesion to the leg-around portion, and to enhance the effect of further preventing leakage from the crotch. it can.
[0053]
In the case where the leg flap elastic member 20 and the leg flap side elastic member 21 are disposed, if the extension stress of these elastic members is large, the leg flap absorber 7 may be irregularly arranged at a position other than the position where the leg elastic member 6 is disposed. And the fit to the wearer's feet may be reduced.
[0054]
From the viewpoint of preventing such inconvenience and reliably improving the fit to the leg area, the extension stress of the leg flap elastic member 20 and the leg flap side elastic member 21 is lower than the extension stress of the leg portion elastic member 6. Is preferred.
[0055]
When the leg flap elastic member 20 and the leg flap side elastic member 21 are provided on both sides of the diaper, respectively, or a plurality of the leg flap elastic members 20 or the leg flap side elastic members 21 are provided on both sides of the diaper. In this case, it is preferable that the total extension stress of the elastic members disposed on one side of the diaper is lower than the extension stress of the leg elastic members 6 disposed on the same side.
[0056]
Specifically, with respect to the elongation stress of all the leg elastic members on one side, the elongation stress of all the leg flap elastic members located on the same side is in the range of 30% to 99%, among them. It is preferable to be within the range of 50% to 90%. On the other hand, in the leg flap side elastic member, similarly, all the legs located on the same side with respect to the elongation stress of all the leg elastic members on one side. The elongation stress of the flap side elastic member is preferably in the range of 10% to 80%, and more preferably in the range of 30% to 70%.
[0057]
Here, the extension stress of the leg flap elastic member 20, the leg flap side elastic member 21, and the leg portion elastic member 6 is measured as follows.
[0058]
For each of the leg flap absorber and the low rigidity region in the crotch portion of the diaper, a test piece was cut out so that the length in the longitudinal direction in a contracted state was 100 mm, and a tensile tester (Oriental Tech Co., Ltd., chuck The stress at 25% elongation is measured at a distance of 50 mm and a test speed of 300 mm / min), and each elongation stress is obtained by converting it to the width of a test piece.
[0059]
Further, a liquid-impermeable side region 35 is formed on the side edge 7c of the absorber main body 33 in the diaper of the present embodiment. By providing the liquid-impermeable side region 35 on the side edge 7c in this manner, exudates can be prevented from seeping out from the side edge of the absorber main body 33.
[0060]
In this embodiment, a three-dimensional guard 36 is provided to prevent leakage from the crotch part. The three-dimensional card 36 is formed as a left and right pair from the abdominal part A to the back part B, and each three-dimensional guard 36 has a free end 37 on the widthwise inner side of the absorber main body 33, It has a fixed end 38 (a base end of rising) on the outer side. An elastic member 39 is disposed and fixed to the free end 37 of each of the three-dimensional guards 36 in an extended state along the free end 37.
[0061]
Here, the three-dimensional guard is a sheet formed by raising a sheet for suppressing permeation of excrement so as to have a height with respect to the absorber body, and excreting the excrement at the rising portion. It plays a role of preventing the object from moving outward in the width direction.
[0062]
Each of the three-dimensional guards 36 has a free end 37 on the inner side in the width direction of the absorber main body 33, and has a fixed end 38 (a rising end) on the outer side. A free end 37 of each of the three-dimensional guards 36 is provided along the free end 37, and an elastic member 39 for forming a three-dimensional guard is disposed and fixed in an extended state.
[0063]
Further, a liquid-permeable side absorption region 41 is formed between the three-dimensional guard 36 and the side region 35. The side absorption region 41 is provided to mainly absorb excrement that has passed over the three-dimensional guard 36. The method for forming such a side absorption region 41 is not particularly limited as long as the region can be made liquid-permeable. Specifically, a method in which a part from the three-dimensional guard to the side region is formed by a single liquid-impermeable sheet, and a liquid permeation treatment is performed only in a region where the side absorption region is formed, and a three-dimensional guard, a side absorption region and A method of separately preparing sheets for forming these in the side regions and joining them can be cited. A method for forming such a side absorption region will be described with reference to the drawings.
[0064]
FIG. 5 shows a method in which a portion from the three-dimensional guard 36 to the side region 35 is formed by a single liquid-impermeable side edge sheet 40, and only a region where the side absorption region 41 is formed is subjected to a liquid-permeable treatment. An example when the side absorption region 41 is formed is shown. As shown in FIG. 5, a three-dimensional guard 36 is formed on one side edge of the side edge sheet 40, and its fixed end 38 is joined to the side of the top sheet 31 at the skin contact surface P of the absorber main body 33. ing. Further, the other side edge is joined to the side of the back sheet 32 on the non-contact surface side (the same surface as the outer surface) of the absorber main body 33. In the side edge sheet 40 formed in such a band shape, the liquid permeable processing is performed by performing the liquid permeable processing between the area where the three-dimensional guard 36 is formed and the side edge 7c. The region thus set can be used as the side absorption region 41. On the other hand, the side edge 7c portion not subjected to the liquid permeable treatment becomes a liquid impermeable side region 35.
[0065]
The liquid permeable treatment in this case is not particularly limited as long as it is a treatment method that can make the excrement permeability higher than the liquid impermeable region. Specific examples include a known hydrophilic treatment and a method of providing an opening on a liquid-impermeable sheet. For example, a known hydrophilic treatment includes a method of applying a surfactant to the surface of a hydrophobic fiber such as a polyolefin fiber.
[0066]
Next, as a method of forming the side absorption region, a method of separately preparing sheets for forming the three-dimensional guard, the side absorption region, and the side region and joining them will be described.
[0067]
FIG. 6 shows an example where the side absorption region is formed by such a method. First, a liquid-impermeable three-dimensional guard forming sheet 50 that forms the three-dimensional guard 36 is used, and the side edge of the three-dimensional guard forming sheet 50 on which the three-dimensional guard is not formed is a liquid-permeable top sheet. The liquid-impermeable side forming sheet 51 forming the side region 35 is formed at a predetermined distance from a portion where the three-dimensional guard forming sheet 50 is bonded to the top sheet 31. Is joined to. Thus, between the three-dimensional guard forming sheet 50 and the side forming sheet 51, the liquid-permeable top sheet 31 is exposed, so that this region can be used as the side absorption region 41.
[0068]
Among the methods for forming these side absorption regions, the former method is preferable. This is because the manufacturing efficiency can be improved because the work of joining the respective sheets can be omitted.
[0069]
In the disposable diaper of the present embodiment, the elastic members forming the waist elastic member 2a, the waist elastic member 2b, and the leg elastic member 6 shown in FIG. It is fixed between the sheet materials, that is, between the inner layer sheet 42 and the outer layer sheet 8 forming the outer surface via an adhesive.
[0070]
The material for forming the constituent members of the disposable diaper 1 of the present embodiment will be described.
[0071]
As a material for forming the top sheet 31, the back sheet 32, the absorber 5, the inner layer sheet 42, the outer layer sheet 8, and the like, known materials conventionally used for disposable diapers and the like can be used.
[0072]
Specifically, as the topsheet 31, a liquid-permeable sheet, for example, a woven fabric made of natural fibers, a nonwoven fabric made of synthetic fibers, or an aperture film made of a thermoplastic resin is used. In consideration of the dry and wet feel and economics, it is preferable to use a nonwoven fabric made of synthetic fibers.
[0073]
As the nonwoven fabric made of the synthetic fiber, a wet or dry synthetic fiber nonwoven fabric conventionally used as a surface material of an absorbent article, specifically, polyethylene fiber, polypropylene fiber, polyester fiber, polyethylene-polypropylene composite fiber, polyethylene -A wet or dry nonwoven fabric produced using synthetic fibers such as polyester conjugate fiber, polyvinyl alcohol fiber and rayon.
[0074]
Considering the excrement absorbability, the topsheet 31 is preferably subjected to a hydrophilic treatment. The hydrophilic treatment at this time can be, for example, the known hydrophilic treatment described above.
[0075]
Further, as the back sheet 32, a liquid impermeable film is used. Specifically, a liquid impermeable film made of a thermoplastic resin, which has been conventionally used as a leakproof sheet for an absorbent article, such as a polyethylene film and a polypropylene film, is used. Preferably, a vapor-permeable (moisture-permeable) film obtained by blending inorganic fine particles made of calcium carbonate, titanium oxide, or the like with the above-mentioned thermoplastic resin and stretching and molding the same is used.
[0076]
Further, as a material for forming the side edge sheet 40, the side forming sheet 51, and the three-dimensional guard forming sheet 50, an undrawn yarn obtained by melt-spinning a thermoplastic resin, or an undrawn yarn obtained by drawing the undrawn yarn A non-woven fabric obtained by subjecting the obtained drawn yarn to crimping treatment as necessary and then bonding the short fibers obtained by cutting to each other with heat, an adhesive or the like, or entangled with each other by a water stream, a needle, or the like. That is, a nonwoven fabric formed by a wet method, a dry method, a spunlace method, or a spunbond method can be used. Further, a nonwoven fabric directly formed by a melt blown or spun bond forming method can also be used.
[0077]
As the undrawn yarn or drawn yarn, a single fiber or a composite fiber formed of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or the like can be used. As the composite fiber, a sheath-core composite fiber, a parallel composite fiber, or a splittable composite fiber that is divided into a plurality of fibers by heat or external force can be used.
[0078]
As the sheath-core composite fiber, the combination of the core component and the sheath component is PET / PE, PP / PE, or PET / PP (in each case, the former represents the core component and the latter represents the sheath component). Sheath-core type composite fibers are exemplified.
[0079]
Among the nonwoven fabrics made of composite fibers, the nonwoven fabric made of a sheath-core type composite fiber using a high elasticity resin as a core and a low elasticity and / or a low melting point resin as a sheath has excellent texture and elasticity, and also has high productivity. It is particularly suitable because of its high safety and low cost.
[0080]
Further, as the absorber 5, for example, a fiber assembly made of cellulose fibers such as pulp fiber and rayon, a synthetic fiber such as polyethylene and polypropylene, and a water-absorbing polymer held on all or a part of these fiber assemblies. Can be used.
[0081]
As the elastic members of each part, various elastic members conventionally used for pants-type disposable diapers and the like can be used. Examples of the material for forming the elastic member include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, spandex, and foamed polyurethane.
[0082]
As the form of the elastic member of each part, various forms can be used, and the form of the waist elastic member 2a and the leg elastic member 6 is preferably a band-like one having a predetermined width (flat rubber or the like). The form of the elastic part 2b is preferably a thread-like one (e.g., rubber thread), and the form of the elastic member 39 disposed at the free end 37 of the leg flap elastic member 20, the leg flap side elastic member 21, and the three-dimensional guard 36. It is preferably a thread-like material (such as rubber thread), a belt-like material having a predetermined width (such as flat rubber), or a thin film-like material (such as a urethane film).
[0083]
Note that the present invention is not limited to the above embodiment. The above embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and has the same effect. Within the technical scope of
[0084]
【The invention's effect】
According to the present invention, by narrowing the shape of the leg opening in the width direction and increasing the length in the longitudinal direction, it is possible to form the width inward in the width direction at the crotch portion of the outer layer sheet wider, and the outer layer sheet Even in the absorber main body which is disposed inside and is covered by the outer layer sheet, since the width inward in the width direction at the crotch can be ensured to be wide, the absorption amount capable of absorbing a large amount of excrement is reduced. An effect that can be held is exhibited.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a pants-type disposable diaper according to the present invention.
FIG. 2 is a plan view showing an example of a development view of the pants-type disposable diaper of the present invention.
FIG. 3 is a plan view showing another example of the bending means in the pants-type disposable diaper of the present invention.
FIG. 4 is a plan view showing another example of the bending means in the pants-type disposable diaper of the present invention.
FIG. 5 is a schematic sectional view taken along line XX of FIG. 2;
FIG. 6 is a schematic sectional view showing another example of the side absorption region in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper 2 ... Waist opening 2a ... Waist elastic member 2b ... Waist elastic part 3 ... Leg opening 4 ... Joining line 6 ... Leg part elastic member 7 ... Leg flap absorber 7c ... Absorber body Side edge 8… Outer layer sheet 33… Absorber body A… Abdomen B… Back side C… Inseam D… Waist circumference M… Central part in width direction

Claims (7)

A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber body having a liquid-retentive absorber disposed between these two sheets; and a pair of left and right leg openings, wherein the leg opening The absorber main body is arranged inward in the width direction of the diaper, and has an outer layer sheet that defines the outer shape of the diaper. In a pants-type disposable diaper that is fastened leaving the leg opening,
The minimum width of the absorber main body in the crotch part of the pants-type disposable diaper is in the range of 250 mm to 350 mm, and the side edge part in the crotch part of the absorber main body is bent to the back sheet side when worn. Characterized pants-type disposable diapers. A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber body having a liquid-retentive absorber disposed between these two sheets; and a pair of left and right leg openings, wherein the leg opening The absorber main body is arranged inward in the width direction of the diaper, and has an outer layer sheet that defines the outer shape of the diaper. In a pants-type disposable diaper that is fastened leaving the leg opening,
When the length in the longitudinal direction of the leg opening of the outer layer sheet is a and the maximum width of the leg opening is b, a / b is 3.3 or more;
Among the side edges of the outer layer sheet in the crotch portion, the distance from the point located most inward in the width direction to the side edge of the absorber main body is 40 mm or less,
The pants-type disposable diaper according to claim 1, wherein a side edge portion of the crotch portion of the absorbent body is bent toward the back sheet when worn. The pants-type disposable diaper according to claim 1 or 2, wherein a bending means is provided on at least a crotch part of the absorbent body. The underpants-type disposable diaper according to claim 3, wherein the bending means is means for disposing an elastic member along a pair of left and right foot-surrounding portions. The pants-type disposable diaper according to claim 3 or 4, wherein the bending means is a means for embossing the absorbent body away from both side edges of the absorbent body. The said bending means is a means spaced apart from both side edges of the said absorber main body, and is a means which forms a pair of low rigidity area | regions whose rigidity is lower than another part in the said absorber main body. The pants-type disposable diaper according to claim 5. 7. The elastic member according to claim 3, wherein, in the crotch part, elastic members are disposed linearly in a longitudinal direction at both side edge portions of the absorber main body. 8. Pants-type disposable diapers.

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