JP2001145663A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article, such as a throw-away diaper, which is easy to mount and has an excellent fitness around the waist and the legs. SOLUTION: This absorptive article has a front surface sheet, a leak-proof sheet and an absorber, is substantially longitudinally long and is used by fastening back side flaps 7 and 7 to an abdomen side B via fastening means. The back side flaps 7 and 7 have high-rigidity regions 7A and low-rigidity regions 7B having the rigidity lower than the rigidity of the high-rigidity regions. The fastening means consists of main fastening means 91 and auxiliary fastening means 92 disposed nearer the crotch C than the positions where the main fastening means 91 are disposed on the back side A or the abdomen side B. The main fastening means 91 are disposed in the high-rigidity regions 7A and the auxiliary fastening means 92 are disposed in the low-rigidity regions 7B or on the outside surfaces of the abdomen side B to be brought into abutment on the low-rigidity regions 7B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article such as a disposable diaper which can be easily worn and has excellent fit at a waist and a leg area.

[0002]

2. Description of the Related Art
A back side flap having a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and a liquid-retentive absorber, and having fastening means on both left and right sides of the back side; BACKGROUND ART Absorbent articles such as disposable diapers used by fastening a side flap portion to an outer surface of an abdominal portion via the fastening means are widely known.

[0003] In such an absorbent article, it is important to enhance the fit around the waist and the leg around the leg in order to enhance the prevention of leakage and the feeling of wearing. On the back side flap, a tape fastener for tightening the waist and a tape fastener for tightening the leg are provided, and these two types of tape fasteners improve the fit around the waist and the leg. Disposable diapers have been proposed. However, in such a conventional disposable diaper, it is necessary to fix two types of fasteners, and the operation for mounting the diaper is not easy.

Accordingly, it is an object of the present invention to provide easy mounting,
An object of the present invention is to provide an absorbent article such as a disposable diaper excellent in the fit of the waist and the leg area.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a liquid-permeable topsheet, a liquid-impermeable leakproof sheet, and a liquid-retentive absorber, is substantially vertically elongated, and has a backside portion. An absorbent article having a pair of back side flaps on both left and right sides and used by fastening the back side flaps to the abdomen through fastening means, wherein the back side flaps are Is
It has a high-rigidity region and a low-rigidity region having a lower rigidity than the high-rigidity region, wherein the fastening means is a main fastening means, and the main fastening means at the dorsal side or the abdominal side. The main fastening means is provided in the high rigidity area, and the sub fastening means is provided in the low rigidity area or the low rigidity area. The above object has been attained by providing an absorbent article provided on the outer surface of the abdominal portion in contact with the rigid region.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on a preferred embodiment. The disposable diaper 1 as an absorbent article of the present embodiment has a liquid-permeable topsheet 2,
The main body 10 has a substantially vertically long shape including a liquid-impermeable leak-proof sheet 3 and a liquid-retentive absorber 4.

The topsheet 2 and the leakproof sheet 3 each have a larger outer dimension than the absorber 4, and the absorber 4 is sandwiched and fixed between these two sheets 2, 3. The leak-proof sheet 3 extends so that both side edges thereof are located to the left and right outside of the both sides 4a, 4a of the absorber 4, and the main body 10
A pair of leg portions 11 is formed on both sides of the disposable diaper 1 along the longitudinal direction. An outer layer sheet 5 made of a nonwoven fabric is disposed on the outer surface of the leak-proof sheet 3, and the outer layer sheet 5 is arranged such that both side edges thereof are located on the left and right sides of both sides 4 a of the absorber 4. Has been extended to
The extending part is connected to the leg parts 11 and 1 together with the leak-proof sheet 3.
1 are formed.

The main body 10 has a substantially rectangular vertically long shape in a tensioned state in which the disposable diaper 1 is expanded in a plane (hereinafter referred to as a tensioned state).
A pair of left and right three-dimensional guards 6, 6 are provided. Each of the three-dimensional guards 6 is formed by arranging a sheet material 62 having an elastic member 61, and the free end 63 of each of the three-dimensional guards 6 is closer to the center in the width direction of the disposable diaper 1 than its base end 64. The base end 64 is formed by bonding and fixing the sheet material 62 to the top sheet 2 above the absorber 4. Each sheet member 62 extends so that the edge opposite to the free end is located outside the side edge 4 a of the absorber 4, and the extended portion is bonded to the leak-proof sheet 3. , Leg portions 11, 11 together with the leak-proof sheet 3 and the outer layer sheet 5.
Is formed.

A waist elastic member (not shown) is provided at each of both longitudinal ends of the disposable diaper 1 to form waist gathers 8,8. Further, the leg portions 11 and 11 are not provided with leg elastic members for forming leg gathers, but when the leg elastic members are provided, leakage from around the legs is more effectively prevented. Is preferred. In addition, as shown in FIG. 2, a plurality of elastic members 61 are arranged substantially in parallel with each three-dimensional guard 6, but only one elastic member 61 is shown in FIG.

[0010] The disposable diaper 1 has a pair of back side flaps 7 on both left and right sides of a back side A arranged on the back side of the wearer when worn.

The back flap portions 7, 7 are shown in FIGS.
As shown in FIG. 3, sheet materials 71 for flap formation are provided on both sides 10a, 10a of the main body 10, respectively.
a, 10a are formed so as to protrude outward. As shown in FIG. 3, the sheet material 71 for forming each flap has a substantially triangular vertically long shape, and a side edge of the disposable diaper 1 in the width direction center side of the disposable diaper 1 in the sheet material 71 is the main body 10. Are sandwiched and fixed between the sheet member 62 and the leak-proof sheet 3.

Each of the back side flaps 7 has a substantially right triangular shape in a tensioned state, and has one end 7c.
Are located at the crotch C arranged on the crotch of the wearer when worn. In each back side flap part 7, one side edge part 7a on the diaper's width direction center side is in a tension state,
The other side edge portion 7b has a linear shape substantially parallel to a center line extending in the longitudinal direction of the diaper, and is located on the outer side in the width direction of the diaper.
Indicates that the angle θ (see FIG. 3) with respect to the one side edge 7a is 15
It forms a straight line of up to 45 °.

Each back side flap 7 has a high rigidity area 7A and a low rigidity area 7 having a lower rigidity than the high rigidity area 7A.
B. That is, another sheet material 72, 72 is bonded to a part of each sheet material 71 for flap formation, specifically, a tip portion in a protruding direction, and a portion where a plurality of sheet materials 71, 72 are stacked. A high rigidity region 7A having high rigidity is formed on the outer side in the width direction of the diaper at an end 7d of the back side flap 7 on the waist end 81 side. The high-rigidity region 7A has a laterally long form in the width direction of the diaper, and an outer end portion thereof further projects outward from the other side edge portion 7b of the back side flap portion 7.

On the other hand, a portion of the back side flap portion where the sheet material 72 is not laminated, that is, a portion composed of only the sheet material 71 is a low rigidity region 7B. The low rigidity area 7B is formed so as to surround the high rigidity area 7A on the inner side in the width direction of the disposable diaper and on the crotch side. In addition, the width W along the width direction of the disposable diaper 1
(See FIG. 3) gradually increases from one end 7c on the crotch C side to the lower end of the high rigidity area 7A.

As shown in FIG. 5, both back side flap portions 7 and 7 are arranged on the abdominal side B when the diaper is worn.
The disposable diaper 1 includes a main fastening means 91 provided in the high-rigidity area 7A as fastening means.
And the auxiliary fastening means 9 provided closer to the crotch C than the position where the main fastening means 91 is provided in the low rigidity area 7B.
And 2.

More specifically, the main fastening means 91 is provided at or near the waist portion 82 arranged around the waist of the wearer when the diaper is worn, and the main fastening means 9 is provided.
2 is provided on a waist portion 83 located below the waist portion 82.

The main and auxiliary fastening means 91 and 92 in the disposable diaper 1 are both male members of a mechanical fastener having a large number of engaging projections on the surface.
The female member of the mechanical fastener (the fastening means) 9
3 is configured to be detachably engageable with a fixed portion formed by arranging 3. Main and auxiliary fastening means 91, 92
Are bonded to the surface of the high-rigidity region 7A or the low-rigidity region 7B by an appropriate bonding method such as welding or bonding. As a male member of the mechanical fastener, for example, "Magic Tape (registered trademark)" manufactured by Kuraray Co., Ltd. or the like can be used. One or both of the main and auxiliary fastening means 91 and 92 are engaged with a fastening portion 93 made of the outer layer sheet 5 where the female member of the mechanical fastener is not provided. May be. Further, both fastening means 91, 92
May be arranged in each of the high rigidity area 7A and the low rigidity area 7B. Further, the two fastening means 91 and 92 may be fastening means having different configurations.

Secondary fastening means 9 in the disposable diaper 1
The male member of the mechanical fastener as No. 2
The area of the engaging surface capable of engaging with the main fastening means 91 is 20 to 80% of the area of the engaging surface of the main fastening means 91, and the shear strength of the sub fastening means 92 is smaller than the shear strength of the main fastening means 91. Is also low. The effect of the fastening means required to obtain excellent fit around the legs is not a firm fastening equivalent to around the waist, but rather prevents the side flaps from turning up and maintains the shape of the diaper This is because the shearing force of the sub-fastening means is preferably lower than the shearing force of the main fastening means in order not to give a feeling of pressure to the legs around the waist which has a large amount of momentum compared to the waist. .

Here, the shear strength of each of the two fastening means 91 and 92 is measured as follows. That is, as shown in FIG. 6, the to-be-attached portion on the abdominal side B which engages with the main fastening means 91 (the to-be-attached means 93, the outer layer sheet 5, etc.)
Is cut so that the longitudinal direction × width direction of the diaper is 5 cm × 5 cm, and the obtained adhered portion B ′ is formed such that the width direction a of the diaper of the adhered portion B ′ is It is adhered to one end of the acrylic plate 29 using a double-sided tape so as to match the direction. Further, the main fastening means 91 is cut so that the length direction × width direction of the diaper is 3 cm × 2 cm,
A sample tape is attached to one end of the main fastening means 91 such that the width direction a of the fastening means 91 coincides with the longitudinal direction of the film 31 of 3 cm × 12 cm. Create 30.

Next, one end of the sample tape 30 is
One end of the aril plate so that the entire surface of the attached main fastening means 91 abuts on the to-be-fixed portion B ′ and the longitudinal direction of the sample tape 30 matches the longitudinal direction of the aril plate 29. On the sample tape 30.
The main fixing means 91 is pressed against the fixed portion B 'by reciprocating the roller of kg once. Then, the sample tape 30
6 by gripping the end on the side where the main fastening means 91 is not adhered, in the direction indicated by the white arrow in FIG.
9 and the same direction as the longitudinal direction of the sample tape 30).
The sample tape 30 was pulled at a speed of 00 mm / min, and the force required for the sample tape 30 to be peeled off from the above-mentioned portion B ′ was measured. The same operation was repeated 10 times to obtain measurement data.
The obtained data is used for the Orientec Co., Ltd. peel test mode data processing software [trade name “MPW-300P” Win
dows95 version], and the shear force was evaluated based on the “maximum point load value”. The shear strength of the auxiliary fastening means 92 was measured in the same manner. The film 31 is optional as long as it can fix the main fastening means 91.

The high-rigidity area 7A in which the main fastening means 91 is provided is provided in the direction perpendicular to the pulling direction when fastening the disposable diaper from the viewpoint of excellent fastening performance when the diaper is attached. Rigidity is 30 by the cantilever method
~ 300mm, preferably 50 ~ 200mm
Is more preferable, and 80 to 150 mm is further preferable. In addition, the low rigidity region 7B provided with the sub-fastening means 92 has a rigidity in a direction perpendicular to the pulling direction when fastening the disposable diaper from the viewpoint of improving the fit on the side of the wearer. It is preferably 0 to 150 mm by the cantilever method, more preferably 0 to 120 mm,
0-100 mm is more preferred. Also, the rigidity in the direction perpendicular to the pulling direction when fastening the disposable diaper,
It is preferable that the rigidity of the high-rigidity area 7A is larger than that of the low-rigidity area 7B by 40 to 100 mm by the cantilever method.

Here, in the present embodiment, the pulling direction when fastening the disposable diaper in the high rigidity area 7A refers to the width direction of the diaper, and the pulling direction when fastening the disposable diaper in the low rigidity area 7B. The direction refers to the width direction of the diaper. The method of measuring rigidity by the cantilever method is specified in JIS L1096 6.19.1. Specifically, a high-rigidity area is a test piece of 2 cm × about 30 cm, and a low-rigidity area is a test piece of 2 cm × about 15 cm. In the case where regions having different stiffness are mixed in the high stiffness region and the low stiffness region, a portion having the largest area ratio is used as a test piece.

Next, a description will be given of a material for forming each member constituting the disposable diaper 1 of the present embodiment. As the material for forming the top sheet 2, the leak-proof sheet 3, the absorber 4, the outer layer sheet 5, the sheet material 62 for forming the three-dimensional guard, and the elastic member 61, those usually used for disposable diapers can be used without any particular limitation. it can.

As a material for forming the sheet material 71 for flap formation, a nonwoven fabric, a woven fabric, a knitted fabric, a film, a foam material, a combination thereof, or the like can be preferably used. Can also. The material for forming the sheet materials 72 for forming the high-rigidity region is not particularly limited as long as it can form the high-rigidity region, and the same material as the sheet material 71 may be used. A material different from the material 71 may be used, and for example, a nonwoven fabric, a film, a plastic, a combination thereof, or the like can be preferably used.

The high rigidity area 7A provided with the main fastening means 91 in the disposable diaper 1 of the present embodiment functions as a grip when the diaper is mounted. In other words, the disposable diaper 1 has a high rigidity area 7 provided with the main fastening means 91.
A is gripped and pulled toward the abdominal part B, and the main fastening means 91
Is fixed to the outer surface of the abdominal part B to be worn on the wearer.

In the present disposable diaper 1, even when the high rigidity area 7A provided with the main fastening means 91 is pulled as a gripping portion when it is mounted, the high rigidity area 7A is hardly deformed. Therefore, it is extremely easy to fasten the main fastening means 91 to the outer surface of the abdomen B, and the diaper can be quickly and optimally fastened. Further, the tightened state is maintained stably mainly by the main fastening means 91. Thereby, in the present disposable diaper, an excellent fitting property to the waist portion can be obtained.

Further, since the back side flap portion 7 has the low rigidity region 7B and the sub-fastening means 92 is provided in the low rigidity region 7B, the rigidity of all portions of the back side flap portion is improved. As in the case where the height is increased, the inconvenience that the main fastening means 91 is easily peeled off from the fastened portion does not occur. Then, the low rigidity region 7 arranged near the legs 11, 11
Since B is deformed along the wearer's skin, an excellent fit around the leg of the wearer can be obtained. In the disposable diaper 1, since the low-rigidity area 7B is formed so as to surround the widthwise inner side and the crotch side of the high-rigidity area 7A, the fitting property particularly at the waist and around the legs. It has become excellent.

When the main fastening means 91 is fastened to the outer surface of the abdomen B, the auxiliary fastening means 92 is fastened to the abdomen at the same time. The mounting operation is extremely simple as compared with the case where the fastening tape is fixed, and the diaper can be mounted easily and quickly even when the baby moves violently, for example.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the back side flaps 7 and 7 in the above embodiment are formed by fixing a sheet material to the main body 10, but the back side flap in the present invention is a member constituting the main body 10, for example. The sheet material 62 for forming the three-dimensional guard, the outer layer sheet 5 and the like may be formed to extend to the side of the diaper. At that time, the sheet material 62,
A part of the sheet material 72 is sandwiched between a plurality of members constituting a body extending to the side of the diaper such as the outer layer sheet 5 and mainly stopped at a part of the sheet material 72 protruding outward from the side edge portion 7b. A wearing means may be arranged. The above disposable diaper 1
Has a pair of ventral side flaps formed in this way on both left and right sides of the ventral side B. Further, the high rigidity region may exist in a state where the entire periphery thereof is surrounded by the low rigidity region.

The sub-fastening means 92 is a portion of the outer surface of the abdominal portion B which is in contact with the low-rigidity area 92 when the diaper is worn, and which is higher than the area in which the high-rigidity area 91 is fastened. May also be provided at a position near the crotch C. For example, the sub-fastening means 92 may be provided at the portion D in FIG. 5, and even with the disposable diaper having such a configuration, the same working effects as those of the disposable diaper 1 of the above embodiment can be obtained. Further, at least a portion of the flap forming sheet material 71 closer to the crotch portion C than the high rigidity region 91 may directly engage with the fastening means 93, the outer layer sheet 5, or both.

The structure of each of the high rigidity region and the low rigidity region is not particularly limited as long as the rigidity of the low rigidity region is relatively lower than that of the high rigidity region. For example,
The high-rigidity region may be formed by increasing the number of stacked sheets as in the above-described embodiment, but the sheet forming the low-rigidity region may have a sheet having a higher rigidity than the low-rigidity region. Can be formed continuously. Also,
Each of the main and auxiliary fastening means may be an adhesive portion formed by applying an adhesive to a high rigidity region or a low rigidity region. The present invention can also be applied to disposable diapers for babies and adults, as well as incontinence pads and sanitary napkins.

[0032]

The absorbent article of the present invention can be easily mounted,
It has excellent fit around the waist and legs.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable diaper as one embodiment of the present invention as viewed from a top sheet in a free state.

FIG. 2 is a sectional view taken along line XX of FIG. 1;

FIG. 3 is a plan view showing one of the back side flaps in the disposable diaper of FIG. 1 in a tensioned state.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

FIG. 5 is a perspective view showing a state where the disposable diaper of FIG. 1 is mounted.

FIG. 6 is an explanatory diagram for explaining a method of measuring a shear strength.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorbent article (disposable diaper) 10 Main body 2 Top sheet 3 Leak-proof sheet 4 Absorber 5 Outer sheet 6 Solid guard 7 Back side flap part 7A High rigidity area 7B Low rigidity area 81 Waist end part 82 Waist part 83 Waist part 91 Main fastening means 92 Secondary fastening means A Back side B Abdominal side C Inseam

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) A61F 13/515 (72) Inventor Hidekazu Ito 2606 Kabanecho, Akaba, Kaigacho, Haga-gun, Tochigi Pref. Yasuyuki Okuda 2606 Akabane, Kaigamachi, Haga-gun, Tochigi Prefecture F-term in the Kao Corporation Research Laboratories (reference) 3B029 BD01 BD09 BD12 BD13 BD14 4C003 CA04 CA05 DA06 FA02 HA05 4C098 AA09 CC01 CC03 CC07 CE14 DD03 DD06 DD10

Claims (5)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and a liquid-retentive absorber, are substantially vertically elongated, and have a pair of back sides on the right and left sides of the back side. An absorbent article having a side flap portion and used by fastening the back side flap portion to the abdomen portion via fastening means, wherein the back side flap portion has a high rigidity region and a high rigidity region. A low-rigidity region having a lower rigidity than a rigid region, wherein the fastening means is a main fastening means and a position on the dorsal side or the abdominal side where the main fastening means is provided. The main fastening means is provided in the high rigidity area, and the sub-fastening means is provided near the crotch part.
An absorbent article provided on the low-rigidity region or on the outer surface of the abdominal portion in contact with the low-rigidity region. 2. The absorbent article according to claim 1, wherein the shear strength of the auxiliary fastening means is lower than the shear strength of the main fastening means. 3. The high-rigidity area has a rigidity of 30 to 300 mm in a direction perpendicular to a pulling direction when fastening the absorbent article by a cantilever method, and the low-rigidity area secures the absorbent article. The stiffness in the direction perpendicular to the pulling direction at the time of stretching is from 0 to 150 mm by the cantilever method.
Or the absorbent article according to 2. 4. The high-rigidity region is formed on an outer side in the width direction of the absorbent article at an end on the waist end side, and the low-rigidity region is formed by connecting the high-rigidity region in the width direction of the absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is formed so as to surround the inner side and the crotch side. 5. The absorbent article according to claim 1, wherein said back side flap has one end located at a crotch.