JP3904354B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a disposable diaper that is easy to wear and excellent in fit of a waist part and a leg part.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-holding absorber, and a back-side side flap portion having fastening means on both the left and right sides of the back side portion, Absorbent articles such as disposable diapers that are used with the dorsal side flaps fastened to the outer surface of the ventral side via the fastening means are widely known.
[0003]
In such an absorbent article, it is important to improve the fit around the waist and the fit around the legs in order to increase the prevention of leakage and improve the wearing feeling. A disposable diaper with a tape fastener for fastening around the waist and a tape fastener for fastening around the legs is provided on the side flap, and these two types of tape fasteners improve the fit around the waist and around the legs. Proposed.
However, in such a conventional disposable diaper, it is necessary to fix two types of fasteners, and an operation for mounting the diaper is not easy.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article such as a disposable diaper that is easy to wear and has excellent fit around the waist and legs.
[0005]
[Means for Solving the Problems]
The present invention includes a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-holding absorber, and is substantially vertically long. In an absorbent article that has a flap portion and is used by fastening the back side flap portion to the abdominal side portion via fastening means, the back side flap portion has a high rigidity region and the high rigidity A lower rigidity region having a lower rigidity than the region, and the fastening means includes a main fastening means and a crotch in the back side portion or the abdominal side portion than the position where the main fastening means is provided. The main fastening means is provided in the high-rigidity area, and the secondary fastening means is in contact with the low-rigidity area or the low-rigidity area. The above object is achieved by providing an absorbent article provided on the outer surface of the ventral part.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on a preferred embodiment thereof.
The disposable diaper 1 as an absorbent article of the present embodiment has a substantially vertically long form including a liquid-permeable top sheet 2, a liquid-impermeable leak-proof sheet 3, and a liquid-retaining absorbent body 4. A main body 10 is provided.
[0007]
The top sheet 2 and the leak-proof sheet 3 each have a larger outer dimension than the absorbent body 4, and the absorbent body 4 is sandwiched and fixed between the two sheets 2 and 3.
The leak-proof sheet 3 extends so that both side edges thereof are located on the left and right outer sides than both side edges 4a and 4a of the absorbent body 4, and along the longitudinal direction of the disposable diaper 1 on both side parts of the main body 10. A pair of leg parts 11 and 11 are formed.
Moreover, the 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 has both side edges positioned on the left and right outer sides than the both side edges 4 a of the absorbent body 4. The extension portion forms leg portions 11 and 11 together with the leak-proof sheet 3.
[0008]
The main body 10 has a substantially rectangular vertically long shape in a tension state (hereinafter referred to as a tension state) in which the disposable diaper 1 is expanded in a plane, and a pair of left and right three-dimensional guards 6, 6 are provided on both sides of the main body 10. Is provided. Each three-dimensional guard 6 is formed by arranging a sheet material 62 having an elastic member 61, and the free end 63 of each three-dimensional guard 6 is located closer to the center side in the width direction of the disposable diaper 1 than its base end 64. The base end 64 is positioned by bonding and fixing the sheet material 62 to the top sheet 2 above the absorber 4.
Each sheet material 62 extends so that the edge opposite to the free end is positioned outward from the side edge 4a of the absorbent body 4, and the extending portion is bonded to the leak-proof sheet 3. The leg portions 11 and 11 are formed together with the leak-proof sheet 3 and the outer layer sheet 5.
[0009]
Further, waist elastic members (not shown) are disposed at both ends in the longitudinal direction of the disposable diaper 1 to form waist gathers 8 and 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. This is preferable. Each solid guard 6 is provided with a plurality of elastic members 61 substantially in parallel as shown in FIG. 2, but only one elastic member 61 is shown in FIG.
[0010]
Thus, the disposable diaper 1 has a pair of back side flap portions 7 and 7 on both left and right sides of the back side portion A disposed on the wearer's back side when worn.
[0011]
As shown in FIGS. 1 to 3, the back-side side flap portions 7, 7 are configured such that a flap forming sheet material 71 projects outwardly from the both side portions 10 a, 10 a on both side portions 10 a, 10 a of the main body 10. It is formed so as to be fixed.
As shown in FIG. 3, each flap-forming sheet material 71 has a substantially triangular shape, and the side edge of the sheet material 71 on the center side in the width direction of the disposable diaper 1 is the main body 10. Are sandwiched and fixed between the sheet material 62 and the leak-proof sheet 3.
[0012]
Each dorsal side flap portion 7 has a substantially right triangle shape in a tension state, and one end portion 7c thereof is located at a crotch portion C disposed on the wearer's crotch portion when worn. The one side edge 7a on the center side in the width direction of the diaper in each back side flap portion 7 has a straight line shape substantially parallel to the center line extending in the longitudinal direction of the diaper in the tension state, and the width of the diaper The other side edge 7b on the outer side in the direction is linear with an angle θ (see FIG. 3) with respect to the one side edge 7a of 15 to 45 °.
[0013]
Each back side flap portion 7 has a high rigidity area 7A and a low rigidity area 7B having a lower rigidity than the high rigidity area 7A. That is, a part of each sheet material 71 for flap formation, specifically, a sheet material 72, 72 is bonded to the leading end in the protruding direction, and a plurality of sheet materials 71, 72 are laminated. As described above, a highly rigid and highly rigid region 7A is formed on the outer side in the width direction of the diaper at the end portion 7d on the waist end portion 81 side of the back side flap portion 7. The highly rigid region 7A has a horizontally long form in the width direction of the diaper, and an outer end portion of the highly rigid region 7A projects further outward from the other side edge portion 7b of the back side flap portion 7.
[0014]
On the other hand, a portion where the sheet material 72 is not laminated in the back side flap portion, that is, a portion made only of the sheet material 71 is the low rigidity region 7B.
The low-rigidity region 7B is formed so as to surround the high-rigidity region 7A on the inner side and the crotch part side in the width direction of the disposable diaper. In addition, the width W (refer FIG. 3) along the width direction of the disposable diaper 1 is increasing gradually as it goes to the lower end part of the highly rigid area | region 7A from the one end part 7c by the side of the crotch part C side.
[0015]
As shown in FIG. 5, each of the dorsal side flaps 7 and 7 is fastened to the outer surface of the abdominal side B when the diaper is worn, but the disposable diaper 1 is used as a fastening means. A main fastening means 91 provided in the high-rigidity area 7A, and a sub-fastening means 92 provided closer to the crotch part C than the position where the main fastening means 91 is provided in the low-rigidity area 7B. ing.
[0016]
More specifically, the main fastening means 91 is provided at or near the waist portion 82 disposed around the wearer's waist when the diaper is worn, and the secondary fastening means 92 is provided at the waist portion 82. It is provided in the waistline part 83 located below.
[0017]
Both of the main and sub fastening means 91 and 92 in the disposable diaper 1 are male members of a mechanical fastener having a large number of engaging projections on the surface, and both of the mechanical fasteners are provided on the outer surface of the ventral portion B. The female member (attachment means) 93 is arranged so as to be detachably engageable with the attachment portion formed. The main and sub fastening means 91 and 92 are joined to the surface of the high-rigidity region 7A or the low-rigidity region 7B by an appropriate joining method such as welding or adhesion. As a male member of the mechanical fastener, for example, “Magic Tape (registered trademark)” manufactured by Kuraray Co., Ltd. can be used.
One or both of the main and sub fastening means 91 and 92 are engaged with a fastening portion 93 made of the outer layer sheet 5 where a female member or the like of a mechanical fastener is not disposed. May be. Further, a plurality of the fixing means 91 and 92 may be arranged in each of the high rigidity region 7A and the low rigidity region 7B. Further, the fastening means 91 and 92 may be fastening means having different configurations.
[0018]
In the male member of the mechanical fastener as the secondary fastening means 92 in the disposable diaper 1, the area of the engagement surface that can be engaged with the secured portion 93 is 20 of the area of the engagement surface of the main fastening means 91. The shear strength of the secondary fastening means 92 is lower than that of the main fastening means 91. The effect of the fastening means required to obtain an excellent fit around the legs is not a firm fastening equivalent to that around the waist, but prevents the side flaps from turning up and maintains the shape retention of the diaper. This is because the shearing force of the secondary 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 that have a lot of momentum compared to the waist. .
[0019]
Here, the shear strength of each of the fastening means 91 and 92 is measured as follows.
That is, as shown in FIG. 6, the longitudinal direction × width direction of the diaper is set so that the to-be-attached portion (the to-be-attached means 93, the outer layer sheet 5, etc.) on the abdominal side B engaging with the main attaching means 91. The acrylic plate 29 is cut so as to have a size of 5 cm × 5 cm, and the obtained adherent portion B ′ is arranged such that the width direction a of the diaper of the adherent portion B ′ coincides with the longitudinal direction of the allyl plate 29. Adhere to one end of the tape using double-sided tape. Further, the main fastening means 91 is cut so that the longitudinal direction × width direction of the diaper is 3 cm × 2 cm, and the back side of the main fastening means 91 is 3 cm in the width direction a of the diaper of the fastening means 91. A sample tape 30 is prepared by being attached to one end of the film 31 so as to coincide with the longitudinal direction of the × 31 cm film 31.
[0020]
Next, one end of the sample tape 30 is placed so that the entire surface of the adhered main fastening means 91 is in contact with the adherend B ′ and the longitudinal direction of the sample tape 30 is in the longitudinal direction of the allyl plate 29. In order to match, it is allowed to stand on one end of the allyl plate, and a 1 kg roller is reciprocated once on the sample tape 30 so that the main fastening means 91 is crimped to the fastened part B ′.
Thereafter, the sample tape 30 is gripped at the end on the side where the main fastening means 91 is not attached, and the direction indicated by the white arrow in FIG. 6 (the same as the longitudinal direction of the acrylic plate 29 and the sample tape 30). Direction) was measured at 300 mm / min, and the force required to peel the sample tape 30 from the adherend B ′ was measured. The same operation was repeated 10 times to obtain measurement data.
The obtained data was subjected to data processing using Orientec Corp. peel test mode data processing software [trade name “MPW-300P” Windows 95 version], and the shear force was evaluated by “maximum point load value” in this. . The shear strength of the secondary fastening means 92 was also measured in the same manner. The film 31 is optional as long as the main fastening means 91 can be fixed.
[0021]
In addition, the high rigidity region 7A provided with the main fastening means 91 has a rigidity in a direction perpendicular to the pulling direction when fastening the disposable diaper from the viewpoint of excellent fastening properties when wearing the diaper. It is preferable that it is 30-300 mm by a cantilever method, 50-200 mm is more preferable, and 80-150 mm is still more preferable. Moreover, the low rigidity area | region 7B in which the subfastening means 92 is provided has the rigidity of the direction orthogonal to the pulling direction at the time of fastening a disposable diaper from a viewpoint of making the fit property in a wearer's side part excellent. It is preferable that it is 0-150 mm by a cantilever method, 0-120 mm is more preferable, and 0-100 mm is still more preferable. Moreover, it is preferable that the rigidity of the direction orthogonal to the pulling direction when fastening the disposable diaper is 40 to 100 mm larger by the cantilever method in the rigidity of the high rigidity area 7A than the rigidity of the low rigidity area 7B.
[0022]
Here, in the present embodiment, the pulling direction when fastening the disposable diaper in the high-rigidity region 7A refers to the width direction of the diaper, and the pulling direction when fastening the disposable diaper in the low-rigidity region 7B. The width direction of a diaper.
The method for measuring rigidity by the cantilever method is defined in JIS L1096 6.19.1. Specifically, 6 pieces of 2 cm × about 30 cm test pieces are collected in the high rigidity region, and 2 cm × about 15 cm test pieces are taken in the low rigidity region, and the average value of the 6 pieces is taken as the measurement value. When areas with different stiffnesses are mixed in the high-rigidity area and the low-rigidity area, the part having the largest area ratio is used as the test piece.
[0023]
Next, the formation material of each member which comprises the disposable diaper 1 of this embodiment is demonstrated.
As the material for forming the surface sheet 2, the leak-proof sheet 3, the absorbent body 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 particular limitation. it can.
[0024]
Moreover, as a forming material of the sheet | seat material 71 for flap formation, a nonwoven fabric, a woven fabric, a knitted fabric, a film, a foam material, those combinations, etc. can be used preferably, and a stretchable material can also be used. Further, the material for forming the sheet materials 72 and 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. For example, a nonwoven fabric, a film, a plastic, or a combination thereof can be preferably used.
[0025]
The high-rigidity region 7A provided with the main fastening means 91 in the disposable diaper 1 of the present embodiment functions as a grip portion when the diaper is worn.
That is, the disposable diaper 1 grips the high-rigidity region 7A provided with the main fastening means 91 and pulls it on the abdominal side B side to fasten the main fastening means 91 to the outer surface of the abdominal side B. To be worn by the wearer.
[0026]
In the disposable diaper 1, even when the high rigidity region 7 </ b> A provided with the main fastening means 91 is pulled as a gripping portion, the high rigidity region 7 </ b> A is not easily deformed. Therefore, it is very easy to fasten the main fastening means 91 to the outer surface of the abdominal side portion B, and the diaper can be quickly and optimally tightened. Further, the tightening state is maintained stably mainly by the main fastening means 91. Thereby, in this disposable diaper, the fitting property excellent in the waist part is obtained.
[0027]
Moreover, since the back side flap part 7 has the low rigidity area | region 7B and the sub-fastening means 92 is provided in this low rigidity area | region 7B, the rigidity of all the parts of the back side flap part was improved. As in the case, there is no inconvenience that the main fastening means 91 is easily peeled off from the fastened portion. And since the low-rigid area | region 7B distribute | arranged to the leg parts 11 and 11 vicinity deform | transforms along a wearer's skin, the fitting property excellent in the wearer's leg periphery is acquired. The disposable diaper 1 is formed so that the low-rigidity region 7B surrounds the inner side and the crotch part side in the width direction of the disposable diaper of the high-rigidity region 7A. It has become an excellent one.
[0028]
Further, when the main fastening means 91 is fastened to the outer surface of the ventral side portion B, the secondary fastening means 92 is fastened to the ventral side portion at the same time. Therefore, two types of fastening tapes are used. Compared with the case where the baby is fixed, the wearing operation is extremely simple. For example, even when the baby moves violently, the diaper can be easily and quickly put on.
[0029]
As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, the back side flap portions 7 and 7 in the above embodiment are formed by fixing a sheet material to the main body 10, but the back side flap portion in the present invention is a member constituting the main body 10, for example, The three-dimensional guard forming sheet material 62, the outer layer sheet 5 and the like may be formed by extending to the diaper side. At that time, a part of the sheet material 72 is sandwiched between a plurality of members constituting the main body extending to the side of the diaper of the sheet material 62, the outer layer sheet 5 and the like, and the sheet material protrudes outward from the side edge portion 7b. Main fastening means may be arranged in a part of 72. The disposable diaper 1 has a pair of ventral side flap portions formed in this manner on both left and right side portions of the ventral side portion B. Further, the high rigidity region may exist in a state where the entire circumference is surrounded by the low rigidity region.
[0030]
Further, the auxiliary fastening means 92 is a part of the outer surface of the abdominal side B where the low-rigidity region 92 abuts when wearing a diaper and is lower than the part where the high-rigidity region 91 is fastened. You may provide in the site | part near C. For example, the auxiliary fastening means 92 may be provided in the D portion in FIG. 5, and the working effect similar to that of the disposable diaper 1 of the above embodiment can be obtained by the disposable diaper having such a configuration. Further, at least a portion closer to the crotch portion C than the high-rigidity region 91 of the flap forming sheet material 71 may be directly engaged with the fixing means 93, the outer layer sheet 5, or both.
[0031]
Further, the configuration 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 compared with the low-rigidity region as in the above-described embodiment, but the sheet forming the low-rigidity region has higher rigidity than the sheet. These sheets can be formed continuously. Further, each of the main and sub fastening means may be an adhesive part formed by applying an adhesive material to the high rigidity region or the low rigidity region. Further, the present invention can be applied to incontinence pads, sanitary napkins and the like in addition to disposable diapers for babies and adults.
[0032]
【The invention's effect】
The absorbent article of the present invention is easy to wear and has excellent fit around the waist and legs.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disposable diaper according to an embodiment of the present invention as viewed from a surface sheet side in a free state.
FIG. 2 is a cross-sectional view taken along the line XX in FIG.
FIG. 3 is a plan view showing one of the back side flaps in the disposable diaper of FIG. 1 in a tensioned state.
4 is a cross-sectional view taken along line YY in 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 shear strength.
[Explanation of symbols]
1 Absorbent article (disposable diaper)
DESCRIPTION OF SYMBOLS 10 Main body 2 Surface sheet 3 Leak-proof sheet 4 Absorber 5 Outer layer 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 Girth part 91 Main fastening means 92 Secondary stop Wearing means A dorsal side B ventral side C inseam

Claims (5)

It is equipped with a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-retaining absorbent body, and is substantially vertically long, with a pair of back-side side flaps on both the left and right sides In the absorbent article used by fastening the dorsal side flap part to the abdominal side part through fastening means,
The dorsal side flap portion has a high-rigidity region and a low-rigidity region that is less rigid than the high-rigidity region,
The fastening means comprises a main fastening means and a sub-fastening means provided closer to the crotch portion than the position where the main fastening means is provided in the back side portion or the abdominal side portion, The main fastening means is provided in the high-rigidity area, and the sub-fastening means is provided in the low-rigidity area or an outer surface of the abdominal side portion that is in contact with the low-rigidity area. . The absorbent article according to claim 1, wherein the shear strength of the secondary fastening means is lower than the shear strength of the primary fastening means. In the high-rigidity region, the rigidity in the direction perpendicular to the pulling direction when the absorbent article is fixed is 30 to 300 mm by the cantilever method, and the low-rigidity region is the pulling direction when fixing the absorbent article. The absorptive article according to claim 1 or 2 whose rigidity of the direction which intersects perpendicularly with a cantilever method is 0-150 mm. The high-rigidity region is formed on the outer side in the width direction of the absorbent article at the end on the waist end side, and the low-rigidity region includes the high-rigidity region on the inner side and inseam in the widthwise direction of the absorbent article. The absorptive article according to any one of claims 1 to 3 formed so that it may enclose on the part side. The said back side side flap part is an absorbent article in any one of Claims 1-4 in which the one end part is located in the crotch part.

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