JP3591574B2 - Absorbent articles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an absorbent article having excellent leakage prevention and operability.
[0002]
Problems to be solved by the prior art and the invention
Various types of absorbent articles provided with a pair of left and right wing portions for improving leakage prevention have been proposed.
[0003]
However, a conventional absorbent article having a wing portion is sold by being packaged with a wrapping material in a state where the wing portion is bent to the skin contact surface side or the non-skin contact surface side, but it is necessary to bend the wing portion. It is not easy, and when it is taken out of the package, operability is poor because of the habit.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article having excellent leakage prevention properties and good operability.
[0005]
[Means for Solving the Problems]
The present invention relates to an absorbent article including a vertically long absorbent main body and a pair of left and right wings provided on both left and right sides in the longitudinal direction of the absorbent main body, wherein the wing comprises at least two sheet materials. The two sheet materials are laminated and bonded via an adhesive, leaving a non-coated portion of a predetermined width formed on the wing portion along both side edges of the absorbent main body. The two sheet materials are a leak-proof sheet and an absorbent sheet disposed on the leak-proof sheet, and a liquid-permeable sheet is disposed over the surface side of the absorbent sheet. The absorbent article is provided as a package in a state where the wing portion is bent toward the skin contact surface side or the non-skin contact surface side of the absorbent article with the non-application portion as a flexible shaft. By doing so, the above object has been achieved.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described.
[0007]
As shown in FIGS. 1 to 3, the sanitary napkin 1 as the absorbent article according to the present embodiment includes a vertically elongated absorbent body 2 and a pair of left and right provided on both left and right sides in the longitudinal direction of the absorbent body 2. The wing 3 is provided.
[0008]
Thus, the wing portion 3 is formed of a laminated sheet 3 ′ formed by laminating at least two sheet materials, and the two sheet materials are formed along the side edges 2 a of the absorbent main body 2. 3 is adhered via an adhesive 34 except for a non-coated portion 35 having a predetermined linear width formed in 3.
[0009]
More specifically, the two sheet materials are a leak-proof sheet 31 and an absorbent sheet 32 disposed on the leak-proof sheet 31. In the present embodiment, the laminated sheet 3 'is further formed of an absorbent sheet. A liquid permeable sheet 33 is provided so as to cover the surface side of the liquid crystal sheet 32.
[0010]
The wings 3 include a pair of left and right front wings 3a provided on the left and right sides in the longitudinal direction on the front side of the absorbent main body 2 and a pair of left and right rears provided on the left and right sides in the longitudinal direction on the rear side of the absorbent main body 2. And a wing 3b.
[0011]
The sanitary napkin 1 of the present embodiment has, in the thickness direction thereof, a vertically long upper layer including a main body absorber 21 and a liquid-permeable top sheet 22 disposed over the surface and side surfaces of the main body absorber 21. A part 20, a liquid-impermeable leak-proof sheet 31, a liquid-permeable sheet 33 having substantially the same shape as the leak-proof sheet 31, and an absorbent sheet 32 interposed between the two sheets 31, 33. The rear 30b side is composed of a lower layer portion 30 which is widened.
[0012]
Then, the upper layer portion 20 is placed on the liquid-permeable sheet 33 of the lower layer portion 30 such that the longer side portion of the lower layer portion 30 extending from the longitudinal side edge of the upper layer portion 20 extends. The front lower wing portion 3a and the rear wing portion 3b are formed by the extended lower layer portion 30.
[0013]
In the present embodiment, the adhesive 34 is applied to the entire surface of the absorbent sheet 32 except for the non-applied section 35 so that the leak-proof sheet 31 and the absorbent sheet 32 are adhered to each other. The front wing 3a and the rear wing 3b are provided on the absorbent body 2 side. As described above, it is preferable to provide the non-coating portion at a position adjacent to the absorbent main body 2 from the viewpoint of operability, and the distance t from the side edge 2a of the absorbent main body 2 to the non-coating portion 35 is 0 to 40 mm. And more preferably 0 to 20 mm. That is, in the case of having the upper layer portion and the lower layer portion as in the present embodiment, the side edge 2 a of the absorbent main body 2 may be located on the non-coating portion 35.
[0014]
The predetermined width w of the non-applied portion 35 is preferably 2 to 20 mm from the viewpoint of the operability of the wing portion when the underwear is attached.
[0015]
Further, from the viewpoint of the wing operability, it is preferable that the application basis weight of the adhesive 34 is 3 to 400 g / m ² and the application thickness is 3 to 400 μm.
[0016]
The ratio of the flexural rigidity of the non-applied portion 35 to the flexural rigidity of the portion to which the adhesive is applied is 1.2 times or more the flexural rigidity of the non-applied portion 35 to the flexural rigidity of the portion to which the adhesive is applied. In particular, it is preferably 1.5 times or more. When the ratio is 1.2 times or more, a difference in operability due to a difference in bending stiffness is generated, and it is easy to bend at a non-coated portion, thereby improving operability.
[0017]
It is preferable that the bending rigidity of the non-applied portion 35 is 0.0001 to 0.0015 mN · m ² / m.
[0018]
It is preferable that the applied portion has a flexural rigidity of 0.002 to 0.02 mN · m ² / m.
[0019]
The recoverability of the non-coated portion 35 is preferably set to 0.05 to 0.15 mN · m / m.
[0020]
The recoverability of the applied portion is preferably 0.18 to 0.5 mN · m / m.
[0021]
Flexural rigidity and recoverability can be measured as follows.
[0022]
The wing portion (including the absorbent main body in some cases) of the absorbent article is cut out to a length of 20 mm and a width of 60 mm so as to cross the non-applied portion to obtain a sample of the non-applied portion. The obtained sample is loaded using a bending rigidity measuring device, trade name “KES” (manufactured by Kato Tech Co., Ltd.) so that the non-coated portion is located between the chucks, and the bending rigidity and the recoverability are measured.
[0023]
In addition, the portion to which the adhesive has been applied is cut out to a length of 20 mm and a width of 60 mm so as not to include a non-applied portion to obtain a sample. The obtained sample is loaded into a bending rigidity measuring device, trade name “KES” (manufactured by Kato Tech), and the bending rigidity and the recoverability are measured.
[0024]
The measurement is performed by bending the entire sample into an arc having a constant curvature at a constant speed and detecting a bending moment accompanying the bending.
[0025]
The measurement conditions were such that the curvature K was in the range of −2.5 to +2.5 (cm ⁻¹ ), and the deformation rate was 0.5 (cm ⁻¹ ) / sec.
[0026]
The bending stiffness is obtained by calculating the inclination between K = 0.5 and K = 1.5 from the characteristic of the process of increasing the absolute value of K. The recoverability is an average value of the hysteresis width in the range of K = 0.5 to 1.5.
[0027]
The topsheet 22 covers substantially the entire back surface of the main body absorbent body 21 except for the central portion thereof, and the topsheet 22 is fixed to the liquid-permeable sheet 33 via an adhesive at a substantially central portion in the width direction. The left and right side edges of the upper layer portion 20 are free edges 23 that are not fixed to the lower layer portion 30. In addition, at both ends 1a and 1b in the longitudinal direction of the sanitary napkin 1, there is no absorber in both the upper layer 20 and the lower layer 30, the upper layer 20 is only the topsheet 22, the lower layer 30 is the leakproof sheet 31 and It is composed of only the liquid-permeable sheet 33, and both are heat-sealed and integrated.
[0028]
In addition, an elastic member (not shown) is provided at an edge of the free edge 23 at a portion which is located on the front side and abuts on the excretion portion of the wearer when worn, forming a gather, The main body absorber 21 is made bulky. Further, grooves 5 are formed in the upper layer portion 20 in the same manner as a normal sanitary napkin.
[0029]
In addition, in this specification, "front" means the part located in front of the wearer at the time of use, and specifically, the part located in front of the longitudinal center part of the absorbent article. Yes, "rear" means a portion located on the rear side of the wearer during use, and specifically, a portion located on the rear side of the central portion in the longitudinal direction of the absorbent article.
[0030]
On the back side of the absorbent main body 2, the front wing portion 3a and the rear wing portion 3b, that is, on the underwear mounting surface of the leakproof sheet, respectively, a main body adhesive portion 61 for mounting underwear, a front wing adhesive portion (not shown), and A rear wing adhesive portion 62 is provided.
[0031]
Next, the forming material of each member in the sanitary napkin of the present embodiment will be described.
[0032]
As the top sheet 22 and the leak-proof sheet 31, a liquid-permeable sheet and a liquid-impermeable sheet which are usually used for sanitary napkins can be used without any particular limitation.
[0033]
In addition, as the liquid permeable sheet 33, a perforated film formed by perforating a film such as polyethylene, or a sheet material such as a net or a nonwoven fabric is used.
[0034]
As the main body absorbent 21, those usually used for sanitary napkins can be used without particular limitation.
[0035]
Examples of the absorbent sheet 32 include a dry pulp sheet (trade name “JS-50HB” manufactured by Habix Co., Ltd.), an embossed absorbent paper obtained by embossing a wet absorbent paper, and the like. Absorbing paper is more preferred.
[0036]
By embossing, the absorbent paper has a thickness, and the liquid does not diffuse in one direction. As the embossed absorbent paper, absorbent paper which is embossed in the form of dots is preferably at a density of 1 to 30 months / cm ² per 1 cm ^2.
[0037]
The thickness of the absorbent sheet 32, from the viewpoint of wings operability and preferred stiffness and absorbent, preferably a 0.2~3mm under 2.5 g / mm ² load.
[0038]
In addition, from the viewpoint of preventing twisting and a feeling of wearing, the buckling strength is preferably from 20 to 500 g, and more preferably from 50 to 300 g. By setting the buckling strength to 20 g or more, the wing portion is less likely to be twisted, and by setting the buckling strength to 500 g or less, it is possible to prevent the whole from becoming too hard and not to feel uncomfortable at the time of mounting.
[0039]
Here, "buckling strength" can be measured as follows.
<Measurement method>
The measurement is performed at 20 ° C. and 65% RH using an absorbent (absorbent sheet) left for one day or more under these temperature and humidity conditions.
[0040]
Specifically, the absorber is cut out at a length of 150 mm and a width of 30 mm, and this is used as a sample. After overlapping the longitudinal ends of the sample so that the width of the overlapped portion was 5 mm and forming a loop, the upper and lower 1 cm portions were stapled with a stapler so that the length direction of the needle was perpendicular to the compression direction. The sample is fixed in place to obtain a ring-shaped sample. The obtained ring-shaped sample is placed on a sample stand of a Tensilon tester (trade name “RTM-25” manufactured by Toyo Baldwin Co., Ltd.) with the longitudinal direction of the sample facing downward. After installation, the sample is compressed at a measurement speed of 10 mm / min in a compression test mode, and the maximum strength at the time of buckling is determined. The measurement is similarly performed on five separately prepared samples, and the average is obtained to determine the buckling strength.
[0041]
The sanitary napkin 1 as the absorbent article according to the present embodiment has a front wing portion 3a and a rear wing portion 3b each having a skin contact surface side or a non-skin contact, similar to a normal night sanitary napkin. It is sold as a package which is folded to the contact surface side, folded in three or the like, and packaged with a packaging material.
[0042]
In the sanitary napkin according to the present embodiment, since the non-applied portion 35 acts as a flexible shaft, the wing portion can be easily folded when forming a package, and the operability during use is improved. Also excellent. Further, since the wing portion 3 is easily bent by the action of the non-coating portion 35 and hardly has a habit, the wing portion 3 is more stably mounted on the undergarment, and the deviation preventing property and the absorbing performance can be further improved.
[0043]
When an absorbent sheet is used for the wing portion and an embossed absorbent paper is used for the absorbent sheet, the absorption performance is further improved, and the effect of preventing leakage is further improved.
[0044]
The sanitary napkin according to the present embodiment first applies an adhesive to the entire surface of the leak-proof sheet except for the non-applied portion to adhere the absorbent sheet, and further covers the absorbent sheet and mounts the liquid-permeable sheet. Then, the leak-proof sheet and the liquid-permeable sheet are heat-sealed and fixed at the peripheral portion of the wing-portion absorber to form a lower layer portion. Next, an upper layer formed by separately covering the main body absorber with a topsheet is fixed on the lower layer via an adhesive, and both ends in the longitudinal direction are heat-sealed.
[0045]
In the above-described embodiment, the sanitary napkin constituted by the upper layer portion and the lower layer portion has been described as an example, but the main body absorber and the wing portion absorber are arranged in parallel in the width direction of the absorbent article. May be arranged.
[0046]
Further, in the above-described embodiment, an example in which the wing portion is composed of two front and rear wing portions has been described, but the wing portion may be either one.
[0047]
Further, the shape of the non-applied portion is not limited to the above-described embodiment, and may be a curved shape, a plurality of non-continuous portions, or a plurality of rows in two or more rows.
[0048]
In the above-described embodiment, the sanitary napkin has been described as an example. However, the present invention is also applicable to an incontinence pad and the like.
[0049]
In the wing portion, the adhesive applied to the entire surface except the non-applied portion may be applied without gaps, or may be applied in a spiral or line shape.
[0051]
【The invention's effect】
The absorbent article of the present invention is excellent in leak prevention and operability.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of an absorbent article of the present invention.
FIG. 2 is an enlarged sectional view taken along line XX of FIG. 1;
FIG. 3 is a cross-sectional view schematically showing a YY cross section of FIG. 1;
[Explanation of symbols]
1 absorbent articles (sanitary napkins)
2 Absorbent main body 20 Upper layer section 21 Main body absorber 22 Top sheet 3 Wing section 3a Front wing section 3b Back wing section 30 Lower layer section 31 Leakproof sheet 32 Absorbent sheet 33 Liquid permeable sheet 34 Adhesive 35 Non-applied section 5 Groove 61 Body adhesive section 62 Rear wing adhesive section

Claims (3)

In a vertically long absorbent body, and an absorbent article comprising a pair of left and right wing portions provided on both left and right sides in the longitudinal direction of the absorbent body,
The wing portion is formed by laminating at least two sheet materials,
The two sheet materials are bonded via an adhesive, leaving a non-application portion having a predetermined width formed on the wing portion along both side edges of the absorbent main body ,
The two sheet materials are a leakproof sheet and an absorbent sheet disposed on the leakproof sheet, and further, a liquid permeable sheet is disposed so as to cover the surface side of the absorbent sheet,
An absorbent article in which the wing portion is folded to the skin contact surface side or the non-skin contact surface side of the absorbent article with the non-applied portion as a flexible shaft . The wing portion includes a pair of left and right front wing portions provided on both left and right sides in the longitudinal direction on the front side of the absorbent main body, and a pair of left and right rear wing portions provided on both left and right sides in the longitudinal direction on the rear side of the absorbent main body. the absorbent article of claim 1, wherein comprising a. A vertically-elongated upper layer comprising a main body absorber and a liquid-permeable topsheet disposed over the surface and side surfaces of the main body absorber, a liquid-impermeable leakproof sheet, substantially the same as the leakproof sheet. Liquid-permeable sheet of a shape, and an absorbent sheet interposed between the two sheets, the front side and the rear side are each made of a lower layer portion made wider,
The upper layer portion is placed on the liquid-permeable sheet of the lower layer portion, such that the longitudinal side portion of the lower layer portion widened from the longitudinal side edge of the upper layer portion extends.
3. The absorbent article according to claim 2, wherein the front wing portion and the rear wing portion are formed by the extended lower layer portion.

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