JP4502586B2 - Disposable absorbent article - Google Patents

Disposable absorbent article Download PDF

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Publication number
JP4502586B2
JP4502586B2 JP2003067287A JP2003067287A JP4502586B2 JP 4502586 B2 JP4502586 B2 JP 4502586B2 JP 2003067287 A JP2003067287 A JP 2003067287A JP 2003067287 A JP2003067287 A JP 2003067287A JP 4502586 B2 JP4502586 B2 JP 4502586B2
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Japan
Prior art keywords
water
sheet
absorbent
resin powder
layer
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JP2003067287A
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Japanese (ja)
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JP2004275225A (en
Inventor
太一郎 鈴木
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株式会社リブドゥコーポレーション
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Priority to JP2003067287A priority Critical patent/JP4502586B2/en
Priority claimed from AT04720202T external-priority patent/AT463219T/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to disposable absorbent articles such as disposable diapers and disposable pants.
[0002]
[Prior art]
In recent years, in the field of sanitary materials using absorbent articles such as disposable diapers, disposable pants, sanitary napkins, especially in the field of disposable diapers for adults required for elderly excretion care, the wearer can change diapers. Absorption with high absorbency that can withstand long-time use and morphological stability that does not easily cause shape loss during use, so that it does not occur many times and to reduce the burden on caregivers. A sex product is desired.
[0003]
Conventionally used absorbent articles are those comprising an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, and as this absorbent body, defibrated pulp fibers, Absorption mats in which water-absorbent resin powder, thermoplastic fibers, etc. are formed in a mat shape and wrapped and fixed with thin paper have been used.
[0004]
In order to improve the absorbent performance of such an absorbent article, it is necessary to increase the amount of defibrated pulp fibers constituting the absorbent mat or increase the amount of absorbent resin powder.
[0005]
However, when the amount of defibrated pulp fiber in the absorbent mat is increased, the thickness of the absorbent mat increases, and the body fluid once absorbed tends to easily return to the top sheet side from the mat. Furthermore, when the thickness of the absorbent mat is increased, a feeling of tingling is increased in the wearer's crotch, which becomes very uncomfortable when used for a long time. Moreover, if it becomes easy to reverse, the body fluid which returned will have a bad influence on a wearer's skin, and the influence will become serious when using especially for a long time.
[0006]
In addition, even when the amount of the water-absorbing resin powder in the absorbent mat is increased to improve the absorbent performance of the absorbent article, the absorbent mat tends to be deformed by the swollen water-absorbent resin powder. .
[0007]
Until now, as an absorbent article with improved body fluid reversibility, an absorbent material having a water-absorbing layer containing a water-absorbing resin between a liquid-permeable surface sheet and a liquid-impermeable leak-proof sheet Has been reported (Patent Document 1). In such a technique, the absorbent material is composed of a highly water-absorbent resin and a fibrous base material, and a structure in which a highly water-absorbent resin layer is further provided between the liquid-permeable surface sheet and the surface of the absorbent material. Adopted.
[0008]
However, the superabsorbent resin layer in the above-mentioned technology is one in which the superabsorbent resin is dispersed alone or sandwiched between water absorbent papers using cellulose fibers or the like, so that the layer contributes to improving the reversibility. Even so, the stability of the form is not taken into consideration at all, and there is a possibility that the superabsorbent resin layer will lose shape due to the superabsorbent resin powder that has swollen after absorbing bodily fluids.
[0009]
Further, as an absorbent article that is ultra-thin and does not lose shape after water absorption, it is a water-absorbing laminate that does not contain pulp fibers other than non-woven fabric, and the water-absorbent resin powder and hot-melt adhesive are sandwiched between two non-woven fabrics. A laminated body for water absorption of a provided disposable product has also been reported (Patent Document 2).
[0010]
In such a technique, since the water-absorbent resin powder is held by the hot melt adhesive, there is no fear of causing a shape loss, and an ultra-thin absorbent mat that is comfortable for the wearer is provided. However, when the purpose is to use for a long time, it is necessary to use a large number of the absorbent mats or to increase the area per one sheet and the amount of the water-absorbing resin in order to secure a larger amount of absorption.
[0011]
If a large number of absorbent mats are used in this way, or if the amount of the water absorbent resin per absorbent mat is increased, the proportion of the water absorbent resin particles used in the above-mentioned absorbent article increases, so that the overall absorbent body becomes a rigid absorbent body. This is not preferable because it gives a worn-out feeling. In addition, increasing the area per absorbent mat requires that the area of the disposable absorbent article itself be increased, which is inconvenient not only for manufacturing but also for use. Become.
[0012]
[Patent Document 1]
JP 2002-224161 A
[Patent Document 2]
International Publication No. 01/89439 Pamphlet
[0013]
[Problems to be solved by the invention]
The present invention has been made by paying attention to the circumstances as described above, and its purpose is to have a high absorption performance that can be used for a long time, and is less likely to lose its shape even if it absorbs body fluids, and An object of the present invention is to provide a disposable absorbent article provided with an absorbent mat having a comfortable wearing feeling that hardly causes reversal.
[0014]
[Means for Solving the Problems]
The disposable absorbent article of the present invention is a disposable absorbent article comprising an absorbent mat between a liquid-permeable top sheet and a liquid-impermeable back sheet, wherein the absorbent mat is a water-absorbent resin powder. A sheet-like water-absorbing layer that does not contain pulp fibers, and a fiber assembly layer that contains water-absorbent resin powder and pulp fibers, in that order from the surface sheet side, and the sheet-like water-absorbing layer comprises a water-absorbing layer. It has a gist in that it has a plurality of water-absorbing resin powder existing regions including the water-soluble resin powder and a water-absorbing resin powder non-existing region formed between adjacent water-absorbing resin powder existing regions.
[0015]
By adopting such a configuration, it is possible to improve the absorption performance, so that even when used for a long time, the absorption ability can be sufficiently exerted, and the return of body fluid can be suppressed.
[0016]
The water-absorbing resin powder in the sheet-like water-absorbing layer is encapsulated between a plurality of non-woven sheets, and further, the non-woven sheet of the sheet-like water-absorbing layer is welded in the water-absorbing resin powder non-existing region. Preferably there is.
[0017]
In addition, two or more layers of the sheet-like water-absorbing layer may be laminated, and in this case, the water-absorbing resin powder existing region of each sheet-like water-absorbing layer is laminated so as to substantially overlap in the thickness direction. Is recommended.
[0018]
The nonwoven fabric in the sheet-like water-absorbing layer has a substantially rectangular shape having a longitudinal direction and a width direction, and the water-absorbing resin powder existing region is continuous in the longitudinal direction of the nonwoven fabric and the water-absorbing resin powder is not in the width direction. It is preferable that a plurality exist by being separated by the existence region.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The disposable absorbent article according to the present invention comprises an absorbent mat between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the greatest feature of the present invention is the absorbent mat Has a sheet-like water-absorbing layer containing water-absorbing resin powder and not containing pulp fibers, and a fiber assembly layer containing water-absorbing resin powder and pulp fibers in this order from the surface sheet side, and the sheet The water-absorbing layer has a plurality of water-absorbing resin powder existing regions including the water-absorbing resin powder and a water-absorbing resin powder non-existing region formed between adjacent water-absorbing resin powder existing regions.
[0020]
By adopting the absorption mat having the above-described configuration, it was possible to secure a water absorption amount that can withstand long-time use and to prevent deterioration in feeling of use such as reversibility.
[0021]
First, the fiber assembly layer constituting the absorbent mat will be described.
In the absorbent mat according to the present invention, the fiber assembly layer is provided below the sheet-like water-absorbing layer, and is indispensable for ensuring a water-absorbing amount that can withstand long-term use.
[0022]
This fiber assembly layer is composed of defibrated pulp fibers, heat-fusible fibers, and water-absorbent resin powders dispersed in these fibers, and these are integrally formed with thin paper (such as tissue paper). Wrapped and formed.
[0023]
As the water-absorbing resin powder dispersed in the fiber assembly layer, those similar to the sheet-like water-absorbing layer described later can be used. The amount of the water-absorbing resin at this time is preferably 15% by mass or more and 90% by mass or less with respect to the amount of defibrated pulp fiber used for the fiber assembly layer. If the amount of the water-absorbing resin exceeds 90% by mass, the resin is too much to give a hard impression as a whole, and the swollen water-absorbing resin may cause a shape loss. On the other hand, if the water-absorbing resin is less than 15% by mass, the content is too small and cannot effectively contribute to the improvement of the absorption amount.
[0024]
As the defibrated pulp fiber which is a fiber forming the fiber assembly layer, known pulp fibers can be used, and as the heat-fusible fiber used for improving the shape retention, polyolefins such as polyethylene and polypropylene are used. Examples thereof include fibers, polyester fibers, and composite fibers.
[0025]
The fibers and the water-absorbing resin are mixed and formed into an integral type, or after the fibers are molded, the water-absorbing resin is sprayed to form a fiber assembly layer. The integrated fiber assembly layer is preferably mechanically pressed while being heated to stabilize its shape. After that, it is wrapped in tissue paper. As the thin paper, tissue paper or the like may be used, but it is not particularly limited as long as it can transmit body fluid. In addition, what is necessary is just to determine suitably the whole planar shape of a fiber assembly layer according to a use, for example, shapes, such as a gourd type, a rectangle, and an hourglass type, are mentioned.
[0026]
Next, the sheet-like water absorption layer will be described. 1 and 2 are a partially cutaway perspective view and a schematic sectional view showing a typical embodiment of a sheet-like water absorbing layer according to the present invention. In addition, the arrow of the right side in the following FIGS. 2-7 and FIG. 9 means that the upper side is a wearer's skin surface side. The sheet-like water-absorbing layer 1 has a water-absorbing resin powder 3 sandwiched between a first nonwoven fabric sheet 2 and a second nonwoven fabric sheet 4 having substantially the same area and the same shape as the first nonwoven fabric sheet 2. Are fixed to each nonwoven fabric sheet by the first adhesive layer S1 applied on the first nonwoven fabric sheet 2 and the second adhesive layer S2 applied on the second nonwoven fabric sheet 4.
[0027]
Here, 2a is a water-absorbing resin powder non-existing region at both ends in the width direction of the sheet-shaped water absorbing layer (referred to as both-end region 2a), and 2b is a water-absorbing resin powder non-existing region provided in the middle part of the sheet-like water absorbing layer. (Referred to as an intermediate region 2b), and 2c is a water-absorbing resin powder existing region. That is, in FIG. 1, a plurality of water-absorbing resin powder existing regions 2c are continuous in the longitudinal direction of the nonwoven fabric sheets 2 and 4, and a plurality of water-absorbing resin powder existing regions 2b are separated in the width direction by the water-absorbing resin powder non-existing regions 2b.
[0028]
And the 1st and 2nd nonwoven fabric sheets 2 and 4 are joined in the both-ends part field 2a and middle field 2b where water-absorbing resin powder does not exist. That is, the water absorbent resin powder existing region 2c is defined by the sealing portion 5 from the adjacent water absorbent resin powder existing region. 1 and 2 show an example in which the adhesive layers S1 and S2 are disposed only in the water absorbent resin powder existing region 2c, but the adhesive layers S1 and S2 may also be disposed in the water absorbent resin non-existing region. Moreover, you may form the sealing part 5 by sealing with heat sealing etc. FIG.
[0029]
FIG. 3 shows a state where the absorbent mat according to the present invention has absorbed body fluid. Here, 1 is a sheet-like water absorption layer, and 6 is the fiber assembly layer described above. As shown in FIG. 3, the water absorbent resin powder 3 swells by absorbing bodily fluid excreted from the wearer. At this time, the water-absorbent resin powder 3 increases its volume in the range of elongation allowed by the nonwoven fabric sheets 2 and 4 in the water-absorbent resin powder existence region 2c divided by the sealing portions 5 and 5, and the sheet-like absorbent layer Increase the thickness of 1. As a result, the distance between the fiber assembly layer 6 provided in the lower part of the sheet-like water absorption layer 1 and the wearer's skin is greatly increased.
[0030]
The fiber assembly layer 6 has a large number of spaces between the fibers, and the water absorbent resin 7 contained in the fiber assembly layer 6 is present in a dispersed manner without being concentrated in one place. Yes. Therefore, since the space becomes a swelling space for the fibers or the water absorbent resin 7 at the time of water absorption, the thickness of the fiber assembly layer 6 does not change extremely before and after the absorption of the body fluid.
[0031]
In general, the reverse (wet back) phenomenon in an absorbent article originates from the fiber assembly layer provided in the article. The fiber assembly layer retains the discharged body fluid mainly in the space between the fibers. Therefore, the body fluid retained between the fibers easily exudes to the surface of the fiber assembly layer when the fiber assembly layer is subjected to some pressure. On the other hand, the water-absorbent resin holds the absorbed body fluid firmly inside the water-absorbent resin, and even if the resin is pressed, the once absorbed body fluid oozes out to the resin surface again. There is very little.
[0032]
In the absorbent article of the present invention, once the body fluid is absorbed as described above, the thickness of the sheet-like absorbent layer 1 increases due to swelling of the water-absorbent resin 3, so that the fiber aggregate layer 6 that is the final water retention layer and Even when the fiber assembly layer 6 is pressed, the body fluid that exudes from the fiber assembly layer 6 exceeds the sheet-like absorbent layer 1 with increased thickness. It becomes difficult to reach the top sheet 11 (see FIG. 9), and the return of body fluid is effectively suppressed.
[0033]
At this time, the sealing portion 5 provided in the water absorbent resin powder non-existing regions 2a and 2b gradually rises from the position before water absorption to the upper side in the thickness direction as the water absorbent resin powder 3 swells. . As a result, a gap 8 is generated between the fiber assembly layer 6 and the sealing portion 5. The void 8 generated in this manner diffuses the body fluid that has exuded from the pressed fiber assembly layer 6 in the length direction of the absorbent article through the void portion. it can.
[0034]
The gap generated between the fiber assembly layer 6 and the sheet-like water absorbing layer 1 functions effectively when used for a long time, especially when absorbing body fluid discharged after the second time. That is, when the sheet-like water absorbing layer 1 has already absorbed a certain amount of bodily fluid, the amount of water that can be absorbed is no longer limited even if new bodily fluid is discharged here, and this portion exceeds the allowable amount. Cannot absorb water. In such a case, if there is a void as described above below the sheet-like water-absorbing layer 1, the body fluid that has not been absorbed is passed through the void portion to a portion that still has room for water absorption in the fiber assembly layer 6. Can be diffused.
[0035]
Furthermore, the sheet-like absorbent layer 1 also contributes to prevention of reversion by preventing passage of body fluid from the fiber assembly layer 6 side to the sheet-like absorbent layer 1 side. That is, at the time of body fluid absorption, the absorbent resin powder region 2c in the sheet-like absorbent layer 1 is in a state where the swollen water absorbent resin powder 3 is closely packed, and such a region is very difficult to pass liquid. It is.
[0036]
The swollen absorbent resin powder existence region 2c prevents the body fluid from the fiber assembly layer from returning, and at the same time, prevents the body fluid newly discharged from permeating through the sheet-like water absorption layer. is there. However, the sheet-like absorbent layer 1 according to the present invention is provided with a sealing portion 5 (intermediate region 2b), and the sealing portion 5 has no or no water-absorbing resin. Since the amount of newly discharged body fluid can be quickly transferred to the lower fiber assembly layer 6 through the sealing portion 5, the body fluid from the second time onward is also reliably absorbed. can do.
[0037]
As described above, in the present invention, the sheet-like water-absorbing layer 1 and the fiber assembly layer 6 have the above-described structure, so that it is possible to secure a sufficient amount of absorption that can quickly absorb the second and subsequent effluents. Furthermore, the return of body fluid can be suppressed to a lower level, and the wearer's skin can be prevented from being contaminated and kept clean.
[0038]
A liquid-permeable non-woven fabric is used for the first non-woven fabric sheet 2 and the second non-woven fabric sheet 4 of the sheet-like water-absorbing layer 1, and the fibers constituting such a non-woven fabric are hydrophilic such as cellulose, rayon, and cotton. In addition to hydrophobic fibers, hydrophobic fibers such as polypropylene, polyethylene, polyester, and polyamide that have been subjected to a hydrophilic treatment with a surfactant can be used. Moreover, when forming the sealing part 5 by heat sealing, it is good to use a heat-sealable nonwoven fabric. The nonwoven fabric sheets 2 and 4 may be a laminate of a plurality of nonwoven fabrics.
[0039]
The adhesive layers S1 and S2 provided on the nonwoven fabric sheets 2 and 4 are layers for attaching the water absorbent resin powder 3 to the sheet. Therefore, the adhesive layers S1 and S2 are formed in a net shape in order to prevent the water-absorbent resin powder 3 from falling off, and to prevent water absorption and swelling, and to ensure air permeability during use. Is preferred.
[0040]
In order to form the adhesive layers S1 and S2 in a net-like body, a method (curtain spray method, spiral coating method) in which a molten adhesive is discharged from a plurality of nozzles in a thread form is desirable. Specifically, if a curtain spray coater provided with an air jet port in which a plurality of small discharge hole groups are arranged in a straight line and heated air can be jetted in the vicinity of each discharge hole, By spraying air on the molten adhesive that has been discharged linearly, it can be applied as a net-like aggregate in which a large number of fine fiber adhesives are randomly attached. In addition, if a spiral spray nozzle gun equipped with three or more air outlets that are capable of blowing air toward the center of the nozzle in the vicinity of the hot melt adhesive discharge hole is used, a spiral bond can be formed on the nonwoven fabric. An agent layer can be formed. Although FIG. 1 shows an example in which the adhesive layer S1 is applied by the curtain spray method and S2 is applied by the spiral coating method, the present invention is not limited to the illustrated example, and the adhesive layers S1 and S2 can be freely formed. Can do.
[0041]
The adhesive layers S1 and S2 may have a form having a plurality of adhesive application parts or a form in which the adhesive layer is applied to the entire surface of the nonwoven fabric sheet.
[0042]
As the adhesive used for the first adhesive layer S1 and the second adhesive layer S2, the same type or different types of adhesives can be used, and the type thereof is not particularly limited. For example, natural rubber, butyl rubber, rubber such as polyisoprene, styrene elastomer such as SIS, SBS, SIBS, SEBS, SEPS, ethylene / vinyl acetate copolymer (EVA), polyester, acrylic, polyolefin elastomer, etc. A hot melt adhesive is used. It is preferable to have an adhesive strength that can prevent the water-absorbing resin from falling off after water absorption and to have an elongation that can follow the swelling of the water-absorbing resin. It is preferable to use it.
[0043]
As the water-absorbing resin used in the sheet-like water-absorbing layer 1 or the fiber assembly layer 6 described above, known water-absorbing resins can be used, for example, polyacrylic acid-based, cellulose-based, starch / acrylonitrile-based water-absorbing resins. Can be mentioned.
[0044]
In the sheet-like water-absorbing layer 1, the water-absorbing resin powder existence region 2 c is sandwiched between the non-woven fabric sheets 2 and 4 and the non-woven fabric sheets 2 and 4 are sealed in the water-absorbing resin absence portion. The space where the conductive resin 3 can swell is limited. Therefore, in order to properly carry out the present invention, the spraying amount of the water absorbent resin 3 is 100 g / m with respect to the existing region.2250 g / m2The following is preferable. 100 g / m2If it is less than this, it is difficult to ensure sufficient water absorption and to maintain a sufficient distance between the fiber assembly layer 6 and the wearer's skin after swelling, while 250 g / m.2This is because the cost only increases even if it is used in excess of. Preferably 130 g / m2220 g / m2Or less, more preferably 150 g / m2200 g / m2It is as follows.
[0045]
As described above, the adhesive layers S1 and S2 are formed on the nonwoven fabric sheets 2 and 4, the water absorbent resin powder 3 is adhered, the nonwoven fabric sheets 2 and 4 are joined, and then the water absorbent resin powder non-existing region is formed. The whole or part of 2a and 2b is sealed. The sealing part 5 must be provided so that at least the adjacent water-absorbing resin existence regions 2c and 2c exist independently. This is because the water absorbent resin 3 has a property of swelling and spreading in the space. Therefore, even when the water-absorbing resin non-existing region is formed in the sheet-like absorbent layer, if there is no sealing portion, the water-absorbing resin swollen across the entire surface between the nonwoven fabric sheets constituting the sheet-like water absorbing layer after water absorption As a matter of course, the swelled water-absorbing resin impedes the permeation of the body fluid discharged after the second time. The water-absorbing resin powder may be present in the non-existing region of the water-absorbing resin powder forming the sealing portion 5 as long as it does not affect the sealing.
[0046]
The sealing portion needs to have a strength that is not destroyed by swelling of the resin.As a means for forming such a sealing portion, heat sealing, bonding with a hot melt adhesive, ultrasonic bonding, Examples include suturing. Among these, heat sealing is preferable because the nonwoven fabric sheets 2 and 4 can be strongly bonded.
[0047]
Moreover, when the resin powder non-existence area | region is provided in parallel with the width direction of a sheet-like water absorption layer other than the said both-ends area | region 2a and the intermediate | middle area | region 2b, it is good also considering this area | region as a sealing part. This is because it becomes easy to cut the sheet-like water absorbing layer 1 in the manufacturing process.
[0048]
The absorbent mat included in the absorbent article of the present invention is formed by stacking the sheet-like water absorbing layer 1 on the fiber assembly layer 6. In order to prevent kinking and deformation of the shape when using the absorbent article, the fiber aggregate layer 6 and the sheet-like water absorbing layer 1 may be joined and fixed by means such as an adhesive. However, it is preferable that the adhesive layer has a net shape so as not to prevent the voids 8 from being formed after water absorption and to ensure the breathability of the absorbent article. As the adhesive used at this time, the same adhesive as that used for the sheet-like water-absorbing layer 1 can be used.
[0049]
The absorbent mat may have a laminated structure composed of two or more sheet-like water-absorbing layers 1 and / or fiber assembly layers 6 in order to ensure a sufficient amount of absorption. When the sheet-like water absorbing layer 1 has a laminated structure of two or more layers, a plurality of sheet-like water absorbing layers 1 may be simply laminated (FIG. 4), or the wide sheet-like water absorbing layer 1 is folded back. It is good also as a laminated structure (FIGS. 5 and 6). In the case of a folded structure, if it is a form such as a form folded at the center in the width direction of one sheet-like water absorbing layer 1 (FIG. 5), a form folded back or upward in the width direction (FIG. 6), A laminated structure can be obtained easily in production, and a necessary amount of absorption can be ensured.
[0050]
Further, as shown in FIG. 7, the water absorbency adhered to the adhesive layers S <b> 1, S <b> 2, S <b> 3 between the three nonwoven fabric sheets of the first nonwoven fabric sheet 2, the intermediate nonwoven fabric sheet 9, and the second nonwoven fabric sheet 4. A sheet-like water-absorbing layer 1 ′ provided with the resin layer 3 can also be used. The application form of the adhesive layers S1, S2, and S3 can be freely selected, and even if it is a net shape in which a large number of fine fiber hot melt adhesives are randomly attached, Also good.
[0051]
In this sheet-like water-absorbing layer 1 ′, there is only one non-woven sheet between the upper and lower water-absorbing resin layers 3, so compared to the sheet-like water-absorbing layer 1 shown in FIGS. The manufacturing process is simplified, and the cost of the absorbent article itself can be reduced. Moreover, since the sheet | seat to manufacture may be narrow compared with the case where the sheet-like water absorption layer 1 is turned back and a turn-back process becomes unnecessary, a manufacturing space can also be abbreviate | omitted.
[0052]
However, when adopting the sheet-like water-absorbing layer 1, 1 ′ having the laminated structure as described above, the amount of reversion of the absorbent article using this is reduced, in order to ensure quick absorption rate, diffusibility, It is preferable that the water absorbent resin powder existing regions 2c of the sheet-like water absorbent layer 1 overlap each other. In the upper and lower sheet-like water-absorbing layers 1, the water-absorbing resin powder existing regions 2 c overlap each other, thereby increasing the thickness of the sheet-like water-absorbing layer 1 after swelling and further increasing the gap between the wearer's skin and the fiber assembly layer. Therefore, the effect of suppressing the reverse phenomenon of the liquid is increased. If the water absorbent resin powder existing region 2c and the sealing portion 5 overlap, the void 8 is not effectively formed, and the body fluid discharged after the second time cannot be absorbed smoothly. In addition, in order to keep the above laminated structure stable, it is preferable that each sheet-like absorption layer is bonded and fixed.
[0053]
On the other hand, when the fiber assembly layer 6 has a laminated structure, the use of a large number of fiber assembly layers 6 leads to an increase in the thickness of the absorbent mat, thereby increasing the feeling of tingling at the wearer's crotch. The number of stacked layers may be appropriately determined in consideration of the fact that the feeling of use may be deteriorated.
[0054]
The absorbent mat obtained as described above is used as an absorbent body for disposable absorbent articles such as disposable pants, disposable diapers, and sanitary shorts. 8 and 9 show preferred embodiments of the absorbent article of the present invention. 9 is a cross-sectional view taken along line XX in the plan view of FIG. First, the absorbent article 10 has an absorbent mat 13 sandwiched between the liquid-permeable top sheet 11 and the liquid-impermeable back sheet 12 so that the sheet-like water-absorbing layer 1 is on the top sheet 11 side. The liquid-impermeable side sheet 14 is provided so as to cover the side portion from the skirt portion of the absorbent mat 13.
[0055]
Here, the side sheet 14 is joined to the top sheet 11 and the back sheet 12 in the fixing region A provided in the outwardly extending portion of the absorbent mat 13, and the absorbent mat 13 upper part (wearer side) absorbs the side sheet 14. The mat 13 is joined to the topsheet 11 at the edge in the width direction (base end joint portion 15), and further has a rising region B that rises upward from the base end joint portion 15. The side sheet 14 is made of the absorbent article 10.
The front and back end portions of the absorbent article 10 are turned down and joined to the upper surface of the topsheet 11 (not shown).
[0056]
The rising region B is folded back inward in the width direction of the absorbent mat 13 (inward end edge 16), and an elastic member 17 is attached to the inner end edge 16 in an expanded state. At 18, the side sheets 14 are joined together. Such a rising region B rises so that the inner edge 16 is along the wearer's skin with the proximal end joint 15 as the proximal end when the absorbent article 10 is worn, and prevents lateral leakage of body fluid in the crotch portion. To do.
[0057]
As the liquid-permeable surface sheet 11, it is preferable to use a liquid-permeable sheet material because it is necessary to quickly capture body fluid (excrement) from the wearer and transfer it to the absorbent mat 13. Specifically, non-woven materials using hydrophilic fibers such as cellulose, rayon, and cotton, and non-woven fabrics using hydrophobic fibers such as polypropylene, polyethylene, polyester, and polyamide, and the surface is treated with a surfactant. Examples thereof include liquid permeable sheet materials such as those made liquid permeable, or plastic films having openings, which are usually used in disposable diapers.
[0058]
As the liquid-impermeable back sheet 12, it is preferable to use a water-repellent or liquid-impermeable sheet material in order to prevent the body fluid absorbed by the absorbent mat 13 from exuding to the outside of the absorbent article 10. . More preferably, water-repellent nonwoven materials (for example, spunbond nonwoven fabrics, meltblown nonwoven fabrics, SMS nonwoven fabrics, etc.), plastic films (preferably breathable plastic films), and composite materials thereof used for disposable diapers are used.
[0059]
As the side sheet 14, it is preferable to use a water-repellent or liquid-impermeable sheet material. More preferably, the water-repellent nonwoven material (spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric, etc.), breathable or non-breathable plastic film (more preferably breathable plastic film), or a composite material thereof is used.
[0060]
The base end joint 15 that joins the side sheet and the top sheet, the fixed region A that joins the side sheet and the back sheet, and the folded joint 18 that joins the side sheets together are heat seal, hot melt adhesive joint, What is necessary is just to join by methods, such as a sonic bonding.
[0061]
The elastic member 17 attached to the inside edge 16 of the side sheet may be an elastic member that is usually used for disposable diapers, and examples thereof include polyurethane and natural rubber. Can be used. In addition, these elastic members 17 can be attached to the inside edge 16 in a stretched state by a method such as heat fusion bonding, hot melt adhesive bonding, or ultrasonic bonding.
[0062]
The disposable absorbent article 10 shown in FIG. 8 has a shape that expands in the width direction so that a longitudinal rear portion C1 that contacts the wearer's buttocks when worn can wrap the buttocks. Moreover, the length direction intermediate part C2 is formed in a narrow width so that it can be easily adhered to the wearer's crotch, and can be easily bundled following the movement of the wearer. Further, the front portion C3 in the length direction has a width-direction spread that does not give the wearer a sense of incongruity, and is a generally gourd-type disposable absorbent article as a whole. Of course, the overall shape of the disposable absorbent article of the present invention is not limited to the substantially gourd shape shown in FIG. 8, and may be any shape such as a rectangle or an hourglass shape.
[0063]
Moreover, in FIG. 8, although the example which has arrange | positioned the absorption mat 13 over the whole longitudinal direction of the absorbent article 10 was shown, the sheet-like water absorption layer 1 is cut | disconnected by appropriate length, and it is a part in a desired position. For example, the absorbent article may be provided with the sheet-like water-absorbing layer 1 only in the crotch portion.
[0064]
Next, the example of the preferable manufacturing method of the absorption mat concerning the absorbent article of this invention is demonstrated. First, a continuous sheet-like water-absorbing layer in which the sheet-like water-absorbing layer is continuous in the longitudinal direction is produced on a dedicated sheet-like water-absorbing layer production line, cut into a predetermined width, and then wound into a roll. A continuous fiber assembly layer (continuous fiber assembly layer) corresponding to the lower layer of the absorbent mat is manufactured on a production line (preferably an absorbent article production line) separate from the sheet-like water absorption layer production line. To do. Next, a hot melt adhesive is applied to the joint surface with the fiber aggregate layer on the sheet-like water absorbing layer while the continuous sheet-like water absorbing layer is fed out from the roll. While running the continuous fiber assembly layer, the sheet-like water absorption layer is placed thereon and joined and integrated. The obtained continuous absorbent mat is press-pressed to stabilize its shape and cut into a desired size to obtain individual absorbent mats. Next, the absorbent mat thus obtained is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet by a conventionally known method to form an absorbent article. When the sheet-like water-absorbing layer has a smaller area than the fiber assembly layer, a hot melt adhesive is applied to the sheet-like water-absorbing layer that has been cut into a predetermined length in advance, and this is applied to an appropriate location on the fiber assembly layer. For example, the absorbent mat may be transferred to a crotch portion of the absorbent article to form an absorbent mat and then introduced into the absorbent article production line.
[0065]
Also, in the case where the fiber assembly layer for each absorbent article is produced intermittently on the line using a pattern drum or the like, a sheet-like water absorption cut in advance to a predetermined length in the same manner as described above. The absorbent article can be manufactured by integrating the layer and the fiber assembly layer into an absorbent mat and then introducing it into the absorbent article production line.
[0066]
According to the present invention, by adopting the structure as described above, it is possible to provide not only the amount of absorption that can be used for a long time, but also the absorption rate and diffusivity, and thus the reversibility. It was possible to provide an absorbent article with a lower level of
[0067]
【Example】
Hereinafter, the present invention will be described in more detail with reference to experimental examples. However, the following experimental examples are not intended to limit the present invention, and modifications and implementations without departing from the spirit of the present invention are all included in the technical scope of the present invention. The
[0068]
[Comparative example (conventional example)]
An absorbent article comprising an absorbent mat composed of a first fiber aggregate layer and a second fiber aggregate layer was produced between the top sheet and the back sheet.
[0069]
As the surface sheet, a composite fiber having a polyethylene sheath and a polyester core is hydrophilized with a surfactant, cut, carded, and then an air-through nonwoven fabric in which fibers are bonded with hot air is used ( Per unit weight: 20 g / m2).
[0070]
A liquid-impermeable polyethylene film having a thickness of 25 μm was used for the back sheet.
[0071]
The first fiber aggregate layer (lower layer) of the absorbent mat is tissue paper (weight per unit: 18 g / m)2, Size: width 410 mm x length 540 mm), about 1-2 g / m2A hot-melt adhesive (made by Nippon SC Co., Ltd., MQ-24E, rubber-based hot-melt adhesive) was applied in a net shape and sucked into the defibrated pulp fiber mat (weight: about 185 g / m)2) And further uniformly sprayed with water-absorbent resin (manufactured by Nippon Shokubai Co., Ltd., CAS601) (spraying amount: 50 g / m)2), A tissue paper extending from the edge in the width direction of the defibrated pulp fiber mat was prepared by wrapping the defibrated pulp fiber mat and the water absorbent resin.
[0072]
The second fiber aggregate layer (upper layer) was directly formed on the upper surface of the first fiber aggregate layer prepared as described above. About 1 to 2 g / m on the upper surface of the first fiber assembly layer2A hot melt adhesive (similar to that used in the first fiber assembly layer) was applied in a net shape, and tissue paper (weight per unit: 18 g / m) was applied.2, Size: width 180 mm × length 540 mm). In addition, about 1 to 2 g / m2After applying the hot melt adhesive in a net shape, about 78 g / m2Defibrated pulp fiber (180-185 g / m) mixed with a water-absorbent resin (similar to that used in the first fiber assembly layer)2) Was sucked to form a second fiber aggregate layer.
[0073]
Furthermore, about 10-15 g / m on the upper surface of the second fiber assembly layer.2After applying the hot melt adhesive in a net shape, the area of the second fiber assembly layer was about 83 g / m.2The water-absorbing resin was sprayed so that
[0074]
After the absorbent mat composed of the first and second fiber aggregate layers produced and integrated as described above is installed between the top sheet and the back sheet, a region where the absorbent mat does not exist between these sheets is formed. Bonding was performed with a hot melt adhesive to prepare an absorbent article of a comparative example.
[0075]
[Example (Invention)]
In the examples, an absorbent article was produced using the sheet-like water-absorbing layer of the present invention instead of the water-absorbing resin dispersed between the second fiber aggregate layer (upper layer) and the top sheet in the comparative example.
[0076]
The sheet-like water-absorbing layer is a first (surface side) non-woven sheet (weight per unit: 35 g / m2) And second (back side) nonwoven fabric sheet (weight per unit: 20 g / m)2) Hot melt adhesive (coating amount: 10 g / m on both front and back surfaces)2) Was applied in a net shape, and a water-absorbing resin was adhered thereto.
[0077]
As the first non-woven fabric sheet, a so-called spunlace non-woven fabric obtained by carding and hydroentangled a fiber in which rayon fibers and polyester fibers are mixed at a mass ratio of about 7: 3 is used (weight per unit: 40 g / m). m2), As the second nonwoven fabric sheet, an air-through nonwoven fabric in which a composite fiber having a polyethylene sheath and a polyester core is hydrophilized with a surfactant, cut, carded, and then bonded with hot air (Weight per unit: 20 g / m2).
[0078]
The adhesive is applied on the nonwoven fabric so that the width of the water absorbent resin powder existing region is about 15 to 18 mm, and the width of the water absorbent resin powder non-existing region separating each water absorbent resin powder existing region is about 7 It adjusted so that it might be set to -10 mm. In this case, the amount of water-absorbing resin sprayed in the water-absorbing resin powder existing region is about 180 g / m.2Met.
[0079]
After joining a 1st nonwoven fabric sheet and a 2nd nonwoven fabric sheet, the sealing part (sealing part width | variety: about 5 mm) is formed by heat-sealing the said water absorbent resin powder non-existence area | region, and sheet-like water absorption Created a layer.
[0080]
In addition, the total absorption amount of the water-absorbing article in the comparative example and the example was adjusted so as to be almost equal.
[0081]
The following reversibility measurements were performed using each absorbent article obtained as described above.
[0082]
Reversibility measurement
Using a 300 cc glass separatory funnel, 100 cc of artificial urine (1% aqueous sodium chloride solution) flowed vertically in the vicinity of the center of the crotch part of the absorbent articles obtained in the examples and comparative examples. At this time, the vertical distance from the tip of the dropping part of the separating funnel to the top sheet of the absorbent article was 3 cm. The time is measured simultaneously with the start of inflow, and after 5 minutes, 10 sheets of filter paper (made by Toyo Filter Paper Co., Ltd.) having a diameter of 150 mm are placed on the inflow part, and further, a cylinder having a diameter of 150 mm and a total mass of 7 kg is placed thereon. A shaped weight was placed. Measure the filter paper mass 6 minutes after the start of inflow, subtract the filter paper mass (g) after the measurement from the filter paper mass (g) before the measurement, and use the obtained numerical value (g) as the reversal amount to evaluate the reversibility (First measurement).
[0083]
Subsequently, after 10 minutes have passed since the start of the first inflow, 100 cc of new artificial urine is immediately flown into the same part as the first measurement, and 5 minutes after the start of the second inflow (15 from the start of the first inflow). 10 minutes after the start of the second inflow (16 minutes after the start of the first inflow), and the return amount (g) was measured in the same manner as the first measurement. (Second measurement).
[0084]
In the same manner as in the first and second times, the amount of reversion up to the third to fifth times was measured. The total absorption up to the fifth time is 500 cc. The results are shown in Table 1 and FIG.
[0085]
[Table 1]
[0086]
From Table 1 and FIG. 10, even if the absorbent article of the Example repeatedly infused artificial urine, the amount of reversion was small and the amount of increase was small. On the other hand, in the absorbent article of the comparative example, the absorption amount increases, the reversion amount increases, and it can be seen that the amount of artificial urine that exudes to the surface of the absorbent article is increased.
[0087]
【The invention's effect】
Since the absorbent article of the present invention has a high absorption performance, even when it is used for a long time, the reversal can be suppressed to a low level and kept clean without contaminating the wearer's skin. I was able to.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing a sheet-like water absorbing layer according to the present invention.
FIG. 2 is a schematic cross-sectional view of the sheet-like water absorbing layer.
FIG. 3 is a schematic cross-sectional view showing a swollen state of the sheet-like water absorbing layer.
FIG. 4 is a schematic cross-sectional view showing a laminated structure of the sheet-like water absorption layer.
FIG. 5 is a schematic cross-sectional view showing another laminated structure of the sheet-like water absorbing layer.
FIG. 6 is a schematic cross-sectional view showing another laminated structure of the sheet-like water absorbing layer.
FIG. 7 is a schematic cross-sectional view showing a laminated structure of another sheet-like water absorption layer.
FIG. 8 is a view showing a specific example of a preferred absorbent article of the present invention.
FIG. 9 is a schematic cross-sectional view taken along the line XX of the absorbent article.
FIG. 10 is a graph showing the results of Examples and Comparative Examples.
[Explanation of sign]
1 Sheet-like water absorption layer
2 First non-woven sheet
3 Water-absorbing resin
4 Second nonwoven fabric sheet
5 Sealing part
6 Fiber assembly layer
7 Water-absorbing resin
8 gap
9 Intermediate nonwoven sheet
10 Absorbent articles
11 Surface sheet
12 Back sheet
13 Absorption mat
14 Side seat
15 Base end joint
16 Inward edge
17 Elastic member
18 Folded joint
A fixed area
B Rising area
C1 Longitudinal rear
C2 Middle part in the length direction
C3 Longitudinal front
S1, S2 Hot melt adhesive layer

Claims (8)

  1. A disposable absorbent article comprising an absorbent mat between a liquid-permeable top sheet and a liquid-impermeable back sheet,
    The absorbent mat includes a water-absorbent resin powder, a sheet-like water-absorbing layer that does not include pulp fibers, and a fiber assembly layer that includes the water-absorbent resin powder and pulp fibers in this order from the surface sheet side ,
    Before SL sheet water-absorbing layer has a plurality of water-absorbent resin powder presence regions containing the water-absorbent resin powder, a water-absorbent resin powder absence regions are formed between adjacent water-absorbent resin powder existing region ,
    The water-absorbent resin powder in the sheet-like water-absorbing layer is included between a plurality of non-woven sheets,
    By bonding the nonwoven fabric sheet in the water-absorbing resin powder non-existing region, a sealing portion is provided in the water-absorbing resin powder non-existing region,
    By absorption of body fluid, a disposable absorbent article, wherein Rukoto gap occurs between the fiber assembly layer and the sealing portion.
  2. The nonwoven sheet of the sheet-shaped water absorbing layer is, disposable absorbent article according to claim 1 that have been joined by a hot melt adhesive of rubber-based or styrene-based elastomer in the water-absorbent resin powder absence regions.
  3. The disposable absorbent article according to claim 1, wherein the nonwoven fabric sheet of the sheet-like water-absorbing layer is welded in a region where the water-absorbent resin powder is absent.
  4.   2 or more of the said sheet-like water absorption layer are laminated | stacked, The water absorbing resin powder presence area | region of each sheet-like water absorption layer is laminated | stacked so that it may overlap substantially in the thickness direction. Disposable absorbent article.
  5.   The non-woven fabric in the sheet-like water-absorbing layer has a rectangular shape having a longitudinal direction and a width direction, the water-absorbing resin powder existing region is continuous in the nonwoven fabric longitudinal direction, and the water-absorbing resin powder non-existing region in the width direction. The disposable absorbent article according to any one of claims 1 to 4, wherein a plurality of the absorbent absorbent articles are separated by each other.
  6. The disposable absorbent article according to any one of claims 1 to 5, wherein the sealing portion has a strength that is not destroyed by swelling of the resin.
  7. The water-absorbent resin powder in the sheet-like water-absorbing layer is attached to a rubber-based or styrene-based elastomer hot-melt adhesive layer formed in a net shape on the nonwoven fabric sheet. Disposable absorbent article.
  8. The amount of water-absorbing resin sprayed in the water-absorbing resin powder existing area is 100 g / m. 2 250 g / m 2 It is the following, The disposable absorbent article in any one of Claims 1-7.
JP2003067287A 2003-03-12 2003-03-12 Disposable absorbent article Active JP4502586B2 (en)

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Application Number Priority Date Filing Date Title
JP2003067287A JP4502586B2 (en) 2003-03-12 2003-03-12 Disposable absorbent article
AT04720202T AT463219T (en) 2003-03-12 2004-03-12 Absorbent disposable
PT04720202T PT1609448E (en) 2003-03-12 2004-03-12 Disposable absorbent article
DE200460026426 DE602004026426D1 (en) 2003-03-12 2004-03-12 Absorbent disposable
ES04720202T ES2340279T3 (en) 2003-03-12 2004-03-12 Absorbent disposable article.
CA 2518303 CA2518303C (en) 2003-03-12 2004-03-12 Disposable absorbent article
EP20040720202 EP1609448B1 (en) 2003-03-12 2004-03-12 Disposable absorbent article
AU2004220667A AU2004220667B2 (en) 2003-03-12 2004-03-12 Disposable absorbent article
KR20057015496A KR100740976B1 (en) 2003-03-12 2004-03-12 Disposable absorbent article
CN2009101347668A CN101543443B (en) 2003-03-12 2004-03-12 Disposable absorbent article
CNB2004800063679A CN100539976C (en) 2003-03-12 2004-03-12 Disposable absorbent article
US10/548,863 US7767878B2 (en) 2003-03-12 2004-03-12 Disposable absorbent article
PCT/JP2004/003349 WO2004080361A1 (en) 2003-03-12 2004-03-12 Disposable absorbent article

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JP5306773B2 (en) * 2008-10-29 2013-10-02 ユニ・チャーム株式会社 Liquid absorbing structure for worn articles
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JP6226522B2 (en) * 2012-11-30 2017-11-08 株式会社リブドゥコーポレーション Absorber and absorbent article using the same
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JP6226580B2 (en) * 2013-06-17 2017-11-08 株式会社リブドゥコーポレーション Absorbent laminate and absorbent article
JP6265330B2 (en) * 2013-09-30 2018-01-24 日本製紙クレシア株式会社 Light incontinence products
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CN100539976C (en) 2009-09-16
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CN101543443B (en) 2012-07-18
CN101543443A (en) 2009-09-30

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