JP4741454B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having excellent liquid leakage prevention properties and fit properties when worn.

  Up to now, various structures have been proposed for disposable diapers in which an absorber is included between a top sheet and a back sheet. In particular, a plurality of absorption parts that are divided and arranged are being studied, and attempts have been made to improve liquid absorption and leakage prevention. For example, Patent Document 1 discloses a disposable diaper in which an absorbent material is provided in the central portion of a diaper body, both sides of the central absorbent portion are stretchable portions having no absorbent material, and further, an absorbent portion is provided on the outside thereof. Yes. Patent Document 2 discloses a diaper in which a central first absorbent portion is provided along the longitudinal direction of the diaper main body, and a second absorbent portion is provided on both outer sides of the central first absorbent portion with a space therebetween. ing. In Patent Document 3, an absorbent body is provided at the center of the diaper body, leg flaps are attached to both sides thereof, an absorbent part and an elastic part are provided on the flap part, and the ratio of the width of the diaper body and leg flaps is determined on that. A trunks-like diaper having a predetermined range is disclosed. Each of the above diapers has a plurality of absorption parts, and the liquid is difficult to move over the absorption parts. However, the liquid absorbability and the liquid leakage preventing property are still not sufficient, and there is room for improvement in terms of compatibility with fit when a diaper is worn.

JP-A-1-272802 Japanese Patent No. 2884355 JP 2002-1113040 A

  Therefore, the present invention reliably captures and absorbs liquid such as excretory liquid even in a collective amount, and has excellent leakage prevention performance that does not leak the liquid once absorbed to the outside, and also fit when mounted. The purpose is to provide excellent disposable diapers.

  The present invention is a disposable diaper comprising a front sheet and a back sheet, and provided with a liquid-retaining absorbent between the two sheets. The absorbent is divided into a central absorbent and side absorbents on both sides thereof. An interval portion is provided and divided, and a plurality of connecting portion absorbers are intermittently provided in the interval portion to connect the central portion absorber and both side portion absorbers in a ladder shape. The object is achieved by a disposable diaper in which an elastic member is disposed in at least one of the installation portions.

The disposable diaper of the present invention reliably captures and absorbs even a collective amount of excreted liquid such as urine, and leaks to the outside of the diaper even when the liquid once absorbed is released during exercise or the like. It has an excellent anti-leakage property that it can guard.
Furthermore, in combination with the above-mentioned excellent liquid absorption and liquid leakage prevention properties, it has a good fit when wearing diapers, i.e. it fits so that the diaper wraps around the contours of the human body and softly touches the skin without over-tightening. Can touch. Moreover, it is well suited for people with slightly different sizes and body shapes, and can be easily worn.

  Hereinafter, the disposable diaper of this invention is demonstrated in detail, referring drawings which show the preferable embodiment suitably.

FIG. 1 is a perspective view schematically showing a preferred embodiment of the disposable diaper of the present invention. FIG. 1 shows a natural shape of a disposable diaper, that is, a state close to a shape when an elastic member contracts naturally without applying tension, as viewed from the inside of the diaper. The disposable diaper 10 of this embodiment is mounted so that the area between the crotch part 4 of the diaper is along the crotch part of the human body. Then, the fastening tape 3 provided on the flap portion 5a on the back body 51 side is connected to the tape fixing portion (not shown) on the back surface of the flap 5b on the front body 52 side so as to connect the edges 1a and 1b with the waist. Secure and attach. Thereby, the edges 1a and 1b become a continuous waist opening.
In the disposable diaper 10 of the present embodiment, a pocket shape is formed that is flexible and can be deformed flexibly, with the inside of the central region 7 gently curved into a concave shape. With this pocket shape, in the disposable diaper 10 of this embodiment, even when the amount of excretory fluid is large, the liquid can be reliably captured so as to be drawn inside the central region 7. And it can absorb without letting a liquid escape to the center part of the absorber 2 provided in the inside. Further, the gently curved pocket shape is adapted to the contour of the human body, the fitting property in the crotch portion is enhanced, and the elastic member 15 (see FIGS. 2 and 3) and the absorber 2 described later are in a specific form. Therefore, even when there are some differences in size and body shape, and changes in body shape due to exercise, the good fit is maintained.
In FIG. 1, the shape of the absorber 2 is shown by the outline through the surface sheet. Here, the absorber 2 is divided by providing a gap portion 11 between the central absorber 18 and the side absorbers 19 on both sides thereof. A plurality of connecting portion absorbers 8 are intermittently provided in the interval portion 11, and the central absorber 18 and the pair of side portion absorbers 19 are connected in a ladder shape by the connecting portion absorber 8. That is, the connecting portion absorbent body 8 is seen as a cross, and both side portions of the central portion absorbent body 18 and the side portions of the side portion absorbent body 19 on the central portion absorbent body 18 side are seen as a saddle, and this is a ladder shape. This is a ladder-like connection structure with two rows on the left and right.
In addition, although illustrated as a deployment-type disposable diaper in FIG. 1, this invention is not limited to this, A pants-type diaper may be sufficient.

The disposable diaper 10 of the present embodiment will be described in more detail with reference to FIG. 2 in which the portion taken along the line II-II in FIG.
In the disposable diaper 10 of the present embodiment, the absorbent body 2 is provided between the top sheet 21 and the back sheet 22. As described above, the absorber 2 is divided into the central part absorber 18 and the side part absorber 19, and is connected in a ladder shape by the connecting part absorber 8. As shown in FIG. 2, the central absorbent body 18 is provided in the central portion 12 so as to be sandwiched between the top sheet 21 and the back sheet 22. A pair of side part absorbers 19 are respectively provided on the side parts 13 on both sides of the central part absorber 18 so as to be sandwiched between the top sheet 21 and the back sheet 22. The central absorbent body 18 and both side absorbent bodies 19 are respectively spaced apart via the spacing portion 11, and they are connected by the contour thereof via the connecting portion absorbent body 8 (in FIG. 2, the surface sheet 21 is used). The partial absorber 8 is shown in FIG. Thereby, the center part absorber 18 and the side part absorber 19 are connected with the ladder shape via the connection part absorber 8 as mentioned above. At the time of mounting, the connecting portion absorber 8 is arranged so that both side portions 13 connected in a ladder shape are in contact with the left and right inner crotch portions, and as if the rung of the ladder is spanned from the back to the stomach and fits the hip joint. . In FIG. 2, for the convenience shown in the cross-sectional view, the interval portion 11, the central portion 12, and the side portion 13 are indicated by their respective center lines. However, as shown in FIG. Means.
In the disposable diaper 10 of the present embodiment, the central absorbent body 18 and the side absorbent body 19 are thus divided through the interval portion 11 and are not continuous over the entire area. It is suppressed that the liquid absorbed in 18 moves to the side part absorbent body 19 through the inside of the absorbent body, and effectively prevents liquid leakage from the leg periphery (particularly, the crotch part 4 (see FIG. 1)) to the outside of the diaper. Can do. And when violently exercising, there is also a liquid that leaks in the longitudinal direction (X direction) along the interval portion 11, but this is surely dammed and reabsorbed by the connecting portion absorber 18. Thus, liquid leakage can be prevented more effectively. In particular, in a tape-type diaper for adults with a large amount of excretory fluid and a large amount of exercise, a guard for the fluid that flows out through the space 11 is effective and preferable.

  The connection state of each absorber in the disposable diaper 10 of the present embodiment will be further described with reference to FIG. 3 showing a cross section taken along line III-III in FIG. The central absorbent body 18, the connecting part absorbent body 8, and the side part absorbent body 19 do not need to be clearly separated, and the liquid continuously moves in the connecting part as shown in FIG. 3. It is preferable to be able to obtain. Therefore, in the figure, the boundary line 25 between the central part absorber 18 and the connection part absorber 8 and the boundary line 26 between the connection part absorber 8 and the side part absorber 19 are shown as a temporary guide, What is necessary is just to distinguish as each site | part in the whole body, and a boundary position may be changed suitably.

  The absorber 2 may be (a) the central part absorber 18, the side part absorber 19, and the connecting part absorber 8 that are integrally formed in a ladder connection shape as shown in FIG. b) Even if the absorber non-installation part 9 is cut out from a rectangular shape, (c) each absorber may be produced separately and combined. Moreover, although the shape of the absorber 2 is not specifically limited, It is preferable that it is a rectangular absorber like the diaper 10 of this embodiment. In the diaper 10 of the present embodiment, the absorber is provided between the top sheet and the back sheet as described above, but another member may be provided between the two sheets, and both sheets may be provided. Other members may be provided on the outside of the.

  The diaper 10 of this embodiment has the absorber non-installation part 9 distribute | arranged between the said connection part absorbers 8 in the space | interval part 11, as shown in FIG. An elastic member 15 is disposed on at least one of the absorber non-installation portions 9. At this time, the leg opening elastic member 14 may be disposed outside the side part absorber 19 with a distance of 5 mm to 30 mm. The elastic member 15 (preferably in combination with the elastic member 14) contracts with appropriate elasticity, whereby the above-described good pocket shape is formed in the central region of the diaper. As a result, as described above, even when the amount of excretory fluid is large, the fluid can be reliably captured and absorbed. In addition, the elastic member 15 of the absorber non-installation portion 9 is combined with the absorber, so that the overall contraction of the interval portion 11 is moderately relaxed, the hip joint is not tightened too much, and the difference in body shape and size is also possible. Correspondingly good wearing feeling is obtained.

  And as shown in FIG.2 and FIG.3, the space | interval part 11 has made the ridge in the inner side direction of a diaper, and the part closely_contact | connects with a hip joint. In the diaper 10 of the present embodiment, since the coupling portion absorbent body 8 having a high cushioning property is appropriately disposed in combination with the elastic member 15 in the gap portion 11 that forms the ridge, liquid leakage occurs in close contact with the hip joint. A soft feel can be obtained while suppressing the deformation, and it deforms and fits in response to changes in the shape of the hip joint.

  Next, the disposable diaper 10 of the present embodiment will be described in more detail with reference to FIG. 4 schematically showing a partially expanded state of the stretched state. In the disposable diaper 10 of the present embodiment, the outer shape in the stretched state is a substantially hourglass shape in which the width around the crotch portion 4 in the middle of the diaper longitudinal direction (X direction) is narrowed as shown in FIG. It is preferable that the top sheet and the back sheet are respectively molded in their outer shapes and overlapped with the absorber interposed therebetween.

  Leg flap portions 5a and 5b are preferably provided on the outer sides 39a and 39b of the crotch portion 4 in the longitudinal direction (X direction) of the diaper, and the fastening tape 3 is preferably provided on the flap portion 5a on the back body 51 side. At this time, the leg flap part may be constituted by other single or plural sheets instead of the front sheet and / or the back sheet, in addition to those of the present embodiment, and other than the both sheets, A sheet or a non-sheet material may be arranged.

  The total length 38 in the longitudinal direction (X direction) of the diaper is not particularly limited. For example, 600 to 1200 mm is preferable for an adult diaper, and 350 to 550 mm is preferable for an infant diaper. The total width 36 of the diaper is not particularly limited. For example, diapers for adults are preferably 550 to 850 mm, and diapers for infants are preferably 150 to 350 mm. However, as described above, the disposable diaper of the present invention is flexibly deformed by the combination of the elastic member and the absorbent body and maintains its excellent effect, so that it has a high degree of freedom and can cope with a slightly different size and body shape. One feature is that

  In the disposable diaper 10 of this embodiment, although the length of the center part absorber 18 and the side part absorber 19 is not specifically limited, It is preferable that all have a length in a diaper longitudinal direction (X direction). . Although the width (Y direction) of the center part absorber 18 and the side part absorber 19 is not particularly limited, the width of the center part absorber 18 is preferably larger than the width of the side part absorber 19. In this way, the initial absorption function of quickly and surely absorbing a large amount of excretion fluid such as urine is exhibited by the central absorbent body 18, and the side absorbent body 19 exercises from the central absorbent body 18. It is possible to effectively exhibit a guard function that reliably reabsorbs liquid leaking at times and does not reach the outside of the diaper.

Specifically, for example, the width 35 of the central absorbent body 18 is preferably 220 to 340 mm for an adult diaper, and preferably 40 to 130 mm for an infant diaper.
About the width | variety 32 of the side part absorber 19, if it is a diaper for adults, it is preferable to set it as 20-100 mm, for example, and it is more preferable to set it as 30-80 mm. If it is a diaper for infants, it is preferable to set it as 5-20 mm, and it is more preferable to set it as 10-20 mm.
About the total width 37 of an absorber, if it is a diaper for adults, it is preferable to set it as 280-400 mm, and it is more preferable to set it as 300-400 mm. If it is a diaper for infants, it is preferably 60 to 150 mm, and more preferably 80 to 150 mm.

  The width 33 of the space between the central absorbent body 18 and the side absorbent body 19 is not particularly limited. The width 33 is also a connection width of the connection portion absorber 8. The width 33 is preferably determined in consideration of the suppression and prevention of the transition of the liquid once absorbed by the above-described central absorbent 18 to the side absorbent 19. Specifically, for example, in an adult diaper, the width 33 is preferably 10 to 80 mm, and more preferably 30 to 80 mm. In diapers for infants, it is preferably 5 to 20 mm, more preferably 10 to 20 mm.

  Further, as described above, the connecting portion absorber 8 has a function of blocking and absorbing the liquid flowing out in the longitudinal direction (X direction) along the interval portion 11. Furthermore, as described above, the connecting portion absorber 8 moderates the contraction force of the elastic member 15 disposed in the absorber non-installation portion 9 and appropriately responds to deformation when contacting the hip joint portion. And has a function to fit softly. Therefore, it is preferable to determine each connection length 34 of the connection part absorber in consideration of these matters. Specifically, for example, in an adult diaper, the connection length 34 is preferably 30 to 100 mm, and more preferably 40 to 80 mm. In diapers for infants, the thickness is preferably 20 to 70 mm, and more preferably 30 to 60 mm.

Next, the elastic member in the diaper 10 of this embodiment is demonstrated.
In the diaper 10 of the present embodiment, the elastic member 15 is provided in at least one of the absorber non-installation portions 9 as described above. The number of elastic members is not particularly limited, and three elastic members may be provided in parallel as in the present embodiment. Further, the elastic member 15 may pass through the connecting portion absorber 8 and be continuously provided in the plurality of absorber non-installation portions 9. In the diaper 10 of the present embodiment, the elastic member 15 is continuously provided across the three absorber non-installation portions 9 provided in the region of the crotch portion 4 and over the two connection portion absorbers. Yes. By doing in this way, when manufacturing the diaper 10 of this embodiment continuously toward a longitudinal direction (X direction), for example, it is not necessary to stop and perform the attachment process of the elastic member 15, and it is a series. It is preferable at the point which can be processed by this process. The method for fixing the elastic member 15 is not particularly limited, and a normal fixing method may be used. The length of the elastic member 15 is not particularly limited, but it is preferably provided in the substantially crotch portion 4 in the X direction as shown in FIG. In this way, by disposing the elastic member 15 stretched by applying tension in the region of the crotch portion 4 in the stretched state, the elastic member 15 is deforced and contracts when it is in a natural shape or attached, and the diaper The aforementioned good pocket shape can be formed in the central region 7 (see FIG. 1).

  Moreover, in order to assist formation of the pocket shape of the center area | region 7 and to improve the fitting property in a crotch part, the leg opening part elastic member 14 may be provided in the outer side of a side part absorber at a distance of 5 mm-30 mm. preferable. The arrangement position of the leg opening elastic member 14 is not particularly limited. However, as shown in FIG. 4, the leg opening elastic member 14 is preferably provided generally over the crotch portion 4, and the preferable length range and fixing method are elastic members 15. Is the same. The number of the leg opening elastic members 14 is not particularly limited, and a plurality of leg opening elastic members 14 may be arranged in parallel as illustrated.

  In the disposable diaper 10 of the present embodiment, as shown in FIG. 4, six connecting portion absorbers 8 are provided on the left and right sides, and five absorber non-installing portions 9 are arranged on the left and right sides. However, the number thereof is not particularly limited. For example, if it is a diaper for adults, it is preferable to provide 3-16 connection part absorbers 8 on one side, and if it is a diaper for infants, it is preferable to provide 2-12 pieces on one side. Moreover, what is necessary is just to determine suitably distribution (ratio of the sum total of the length in a X direction) of the absorber non-installation part 9 and the connection part absorber 8. FIG. For example, in terms of a value obtained by dividing the sum of the coupling lengths 34 of the coupling part absorber 8 on one side by the total length 41 of the absorber structure, it is preferably in the range of 7 to 80%, and in the range of 30 to 60%. More preferably.

Next, the formation material of each part of the disposable diaper 10 of this embodiment is demonstrated.
As materials for forming the top sheet, the back sheet, the fastening tape, and the tape fixing portion, various materials that are usually used for disposable diapers can be used without any particular limitation.
Various materials such as natural rubber, synthetic rubber, and spandex can be used as a material for forming the elastic member, and various forms such as a thread shape, a belt shape, and a film shape can be used. Especially, about the elastic member 15 of an absorber non-installation part, the maximum elongation rate is 50 to 200% from a viewpoint of forming a favorable pocket shape in the diaper center area | region 7 and preventing a liquid leak without tightening a hip joint too much. It is preferable to use a thing, and it is more preferable to use a 100 to 150% thing.
Here, the maximum elongation rate of the elastic member is measured by the following method. The maximum elongation rate can be obtained from the formula [maximum elongation rate (%) = length of elongation−100]. The stretched length is measured by spreading the diaper flat with the back sheet 3 facing up at room temperature. Apply a ruler to the expanded elastic member and mark it at intervals of 100 mm. As shown in FIG. 4, the diaper is stretched and fixed until it is fully stretched. At this time, the marked interval becomes larger than 100 mm, and the interval is measured with a ruler to obtain an extended length.
Examples of the material for forming the elastic member that can obtain the maximum elongation in the above range include natural rubber, synthetic rubber, and spandex. Moreover, when using the leg opening part elastic member 14 mentioned later, the preferable maximum elongation rate is the same as that of the said elastic member 15, and the kind of the preferable material is also the same.

Here, as a material of the center part absorber 18, the side part absorber 19, and the connection part absorber 8, what is normally used as absorbers, such as a disposable diaper, can be especially used without a restriction | limiting. Examples of the material of the central absorbent body 18 include cotton-like pulp, superabsorbent polymer, and rayon cotton. The same applies to the material of the side part absorber 19.
On the other hand, it is preferable not to use a superabsorbent polymer such as cotton-like pulp or rayon cotton as the material of the connecting portion absorbent body 8. Thus, by not using the superabsorbent polymer as the material of the connecting portion absorbent body 8, when absorbing urine, the absorbent body does not swell excessively and it is difficult to generate a crotch gap.

It is a perspective view showing typically one preferred embodiment of the disposable diaper of the present invention. It is a perspective view which expands and shows the part of the II-II line of FIG. 1 as a partial cross section. It is sectional drawing which shows the cross section of the III-III line of FIG. FIG. 2 is a plan view showing a partially broken state of a stretched state of the disposable diaper of the embodiment shown in FIG. 1.

Explanation of symbols

1a, 1b Edge of diaper (edge to become waist opening)
2 Absorber 3 Fastening tape 4 Crotch part of diaper 5a, 5b Leg flap part 7 Central area (area curved in pocket shape)
DESCRIPTION OF SYMBOLS 8 Absorber connection part 9 Absorber non-installation part 10 Disposable diaper 11 Spacing part 12 Central part 13 Side part 14 Leg opening elastic member 15 Elastic member of absorber non-installation part 18 Central part absorber 19 Side part absorber 21 Surface Sheet 22 Back sheet 25 Boundary line between central part absorber and connecting part absorber 26 Boundary line between connecting part absorber and side part absorber 32 Width of side part absorbent body 33 Width of spacing part 34 Connection length 35 Center Width of the absorbent body 36 Total width of the diaper 38 Overall length of the diaper 39a, 39b Outside of the diaper crotch 41 Total length of the absorbent body 51 Rear body 52 Front body

Claims (5)

A disposable diaper comprising a top sheet and a back sheet, and provided with a liquid-retaining absorbent between the two sheets,
The absorber is divided by providing a gap between the central absorber and the side absorbers on both sides thereof,
A plurality of connecting part absorbers are intermittently provided in the interval part, and the central part absorber and both side part absorbers are connected in a ladder shape,
An elastic member that is stretched by applying tension along the longitudinal direction of the disposable diaper is disposed on at least one of the absorber non-installation portions in the gap portion in the crotch region ,
A disposable diaper characterized in that a leg opening elastic member is provided at a distance from both outer sides of the side part absorber .   The disposable diaper according to claim 1, wherein the elastic member has a maximum elongation of 50 to 200%.   The disposable diaper according to claim 1 or 2, wherein the connecting part absorber does not contain a superabsorbent polymer. The total width of the absorber is 60 to 150 mm, the width of the side portion absorber is 5 to 20 mm, the width of the gap portion is 5 to 20 mm, and each connection length of the connection portion absorber is 20 to 70 mm. The disposable diaper according to any one of claims 1 to 3 , wherein the disposable diaper is an infant diaper. The total width of the absorber is 280 to 400 mm, the width of the side portion absorber is 20 to 100 mm, the width of the gap portion is 10 to 80 mm, and each connection length of the connection portion absorber is 30 to 100 mm. The disposable diaper according to any one of claims 1 to 3 , wherein the disposable diaper is an adult diaper.

Images