JP2006198397A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorber of an absorbent article, excellent in the fitting around legs of a wearer. <P>SOLUTION: The absorbent article 1 has elastic areas in left/right sides and/or front/rear ends to be extended in the longitudinal direction and/or lateral direction, and the absorbers 1 are disposed in the elastic areas. The absorber 1 has elasticity and has a web 2 with hydrophilic crimped long fiber in which highly absorbent polymers 3 are buried and supported. The web 2 with the long fiber is highly oriented in one direction. It is preferable that the direction of orientation of the web matches the longitudinal direction of the absorbent article. The climp percentage of the crimped long fiber is preferably 10-60%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to various absorbent articles including disposable diapers and sanitary napkins.

  Absorbent bodies for absorbent articles using long fiber spread tows are known. For example, an absorbent body comprising a crimped acetate fiber web and a pulverized pulp layer laminated on one side of this layer, in which both layers are integrated by pressing in the thickness direction of the absorbent body, is known. (See Patent Document 1).

  Also, it is known that the water-absorbing core is composed of an upper layer, a lower layer and an absorbent layer located between both layers, and a fiber layer made of acetate fiber tow is disposed on the spray layer of the superabsorbent polymer as the absorbent layer. (See Patent Document 2). A part of the superabsorbent polymer is bonded to the lower layer by an adhesive, and another part is housed in the fiber layer of the tow.

  As an absorption layer having long fiber tows, one in which the tows extend in the thickness direction of the absorption layer is also known (see Patent Document 3). According to Patent Document 3, the excrement moves from the top to the bottom through the gap between the fibers of the tow and can be separated from the wearer's skin, so that it does not cause stuffiness or rash. Has been.

  However, none of the above-mentioned absorbers have sufficient elasticity, so when wearing an absorbent article such as a disposable diaper incorporating the absorber, the absorber is sufficient for the movement of the wearer's body. Cannot be followed, and the absorber is liable to slide or fit.

JP-A-57-160457 Special table 2004-500165 gazette JP 2001-276125 A

  Accordingly, an object of the present invention is to provide an absorbent article that can eliminate various drawbacks of the above-described prior art.

The present invention is an absorbent article having an elastic region extending in the longitudinal direction and / or the width direction in the left and right side portions and / or the front and rear end portions, and an absorbent body arranged in the elastic region,
The absorbent body has a web having hydrophilic crimped long fibers embedded and supported with a superabsorbent polymer and has a stretch property, and the web is highly oriented in one direction. The above object is achieved by providing the above.

  Since the absorbent body disposed in the left and right side portions and / or the front and rear end elastic regions in the absorbent article of the present invention has stretchability, the elastic region of the absorbent article has a fit property around the wearer's body. Get higher. Therefore, when the absorbent article of the present invention is worn, the elastic region sufficiently follows the movement of the wearer's body. As a result, it becomes difficult to generate a gap between the elastic region and the wearer's body, and leakage from the body is effectively prevented. Since the absorbent body having the web is more flexible than the absorbent body mainly composed of fluff pulp having the same absorption capacity, the ease of mounting the absorbent article is improved, and the movement of the wearer is further improved. Even if it is received, the absorbent body can be deformed, so that the absorbent body is less likely to be swayed, and it is difficult to feel uncomfortable during wearing.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of a disposable diaper as an example of the absorbent article of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. A line II-II in FIG. 1 is a portion corresponding to the crotch part of the diaper 10. The diaper 10 shown in FIGS. 1 and 2 includes a liquid-permeable top sheet 11, a liquid-impermeable or water-repellent back sheet 12, and a central absorbent body 13 interposed between the two sheets 11, 12. It is formed substantially vertically long. The liquid-permeable top sheet 11 is formed with a narrower width than the back sheet 12. A water repellent nonwoven fabric 14 is interposed between the central absorbent 13 and the back sheet 12. As these various members constituting the diaper 10, materials known in the technical field can be used.

  The diaper 10 includes waist flaps 17 and 17 extending from the front and rear end edges of the central absorbent body 13 in the front-rear direction. A pair of fastening tapes 18, 18 are attached to the left and right sides of one waist flap 17. A fastening means 18 a for fastening the fastening tape 18 to the back sheet 12 is provided on the surface of the fastening tape 18, that is, the surface of the diaper 10 on the same side as the top sheet 11. Examples of the fastening means 18a include a hook member or a loop member of a mechanical fastener, an adhesive, and the like. Waist elastic strands 17 a and 17 a extending in the width direction of the diaper 10 are disposed in an extended state at the end of the waist flap 17.

  The diaper 10 includes leg flaps 15 and 15 extending laterally from the left and right side edges of the central absorbent body 13. The leg flaps 15 and 15 are provided with leg elastic strands 15a for fitting the diaper 10 to a diaper wearer, respectively. The leg elastic strands 15a are disposed on the left and right sides of the diaper 10 and extend in the longitudinal direction of the diaper 10. The leg elastic strands 15 a are sandwiched and fixed by the back sheet 12 and the water repellent nonwoven fabric 14.

  A pair of three-dimensional guards 16 and 16 are formed on both the left and right sides of the diaper 10 on the surface sheet side. A three-dimensional guard elastic member 16a is arranged at the free ends of the three-dimensional guards 16 and 16 to form a gather.

  As shown in FIG. 2, in the leg flap 15, the absorbent body 1 is disposed separately from the central absorbent body 13 between the water-repellent nonwoven fabric 14 and the sheet constituting the three-dimensional guard 16 (hereinafter referred to as “this”). The absorber 1 is referred to as a second absorber in comparison with the central absorber 13).

  FIG. 3 shows a perspective view of the second absorbent body 1. The second absorbent body 1 has a substantially vertically long flat shape. The second absorbent body 1 is configured by a web 2 having long fibers wrapped with a liquid permeable sheet 4. A superabsorbent polymer 3 is embedded and supported on the web 2. The web 2 is highly oriented in the longitudinal direction of the absorber. The second absorbent body 1 has elasticity in the orientation direction of the web 2. The second absorbent body 1 is arranged so that the orientation direction of the web 2 (the direction orthogonal to the paper surface in FIG. 2) coincides with the extending direction of the leg elastic strands 15a.

  The orientation of the long fiber is not limited as long as the vector connecting the start point and end point of the long fiber is oriented in the plane direction, and part of the long fiber is caused by twisting or entanglement between the start point and the end point. Includes the ones in which the long fibers are oriented in the plane direction as a whole, even if is oriented in the vertical direction (the thickness direction of the absorber). In the present specification, highly oriented means that the degree of orientation is preferably 1.2 or more, more preferably 1.4 or more, with respect to the orientation of the fiber. The degree of orientation is measured using a Microwave molecular orientation analyzer MOA-2001A manufactured by KANZAKI. The sample size is 100 mm in the longitudinal direction and the width is 50 mm, and the average value of three points is the degree of orientation (if the sample size is less than this size, a plurality of samples are arranged so as not to overlap each other). .

  Long fibers are hydrophilic. What is used in the present invention as a long fiber having hydrophilicity is a long fiber that is inherently hydrophilic, and inherently has no hydrophilicity, but is hydrophilic by being subjected to a hydrophilic treatment. Both of the long fibers to which is given are included. Moreover, although the long fiber itself does not have hydrophilicity, what has hydrophilicity as the whole web is also included. The long fiber itself does not have hydrophilicity. However, the hydrophilic property of the entire web is, for example, a web made of hydrophilic material integrated with a web made of non-hydrophilic long fibers. Is mentioned. Preferred long fibers are inherently hydrophilic long fibers, and long fibers such as nylon, acrylic, acetate and rayon are particularly preferred. In particular, acetate, which is a fiber having a moisture content of less than 10%, is particularly preferable because it retains its bulkiness even when wet. Here, the moisture content is a value measured in an environment of 25 ° C. and a relative humidity of 65%.

  There is no restriction | limiting in particular in the fiber diameter of a long fiber. In general, satisfactory results are obtained by using long fibers of 1.0 to 7.8 dtex, in particular 1.3 to 7.0 dtex, and further 1.7 to 5.6 dtex. In the present specification, the long fiber means a fiber having a fiber length of preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 100 mm or more when the fiber length is measured by the average fiber length measurement method (Method C) of JIS L1015. Say. However, when the total length of the web to be measured is less than 100 mm, preferably 50% or more, more preferably 70% or more, more preferably 80% or more of the fibers in the web extend over the entire length of the web. In this case, it is assumed that the fibers of the web are long fibers.

The density of the web 2 is 0.005 to 0.20 g / cm ³ , particularly 0.01 to 0.10 g / cm ³ , and the absorbent 1 is kept flexible in that the liquid permeability is good. This is preferable from the point of quickly absorbing the liquid.

As the long fiber, a crimped one is used. Crimping refers to “crimping of fibers” in JIS L0208. The long fiber has a crimp rate (JIS L 0208) of preferably 10 to 60%, more preferably 20 to 60%, and still more preferably 20 to 50%. By forming the web 2 from the crimped long fibers, sufficient stretchability can be imparted to the absorbent body 1. There is no particular limitation on the means for crimping the long fibers. Further, the crimp may be two-dimensional or three-dimensional. The crimp rate is the length (A) when the long fiber is stretched straight and without stretching the fiber itself, and the length of the straight line (B) between the start point and the end point of the fiber in the natural state. ) Is defined as a percentage of the length when stretched, and is calculated from the following equation.
Crimp rate = (A−B) / A × 100 (%)
The natural state means a state in which one end of the long fiber is fixed to a horizontal plate and hung downward by its own weight.

  As described above, in the present embodiment, the stretchability of the crimped long fiber web is used to impart stretchability to the second absorbent body 1. Furthermore, there is also an advantage that the second absorbent body 1 can be made flexible by using a long fiber web as a constituent material of the second absorbent body 1. Details are as follows. As a liquid-absorbing material for absorbent articles, pulverized pulp is generally used. Since pulverized pulp is a stiff material, diapers using pulverized pulp tend to have poor stretch response. In addition, it tends to be difficult to fit the wearer's body. On the other hand, since the long fiber web is a flexible material, the second absorbent body 1 can be made flexible by using it as the second absorbent body 1 of the diaper 10. The stretch responsiveness of can be improved. Moreover, it becomes easy to fit the 2nd absorber 1 to a wearer's body.

  In the pulverized pulp generally used as the liquid absorbing material of the absorbent article, the integral structure as the absorbent body is easily broken by the liquid absorption. On the other hand, even if a long fiber web absorbs liquid, the integral structure as an absorber is not easily broken. Also from this viewpoint, it is advantageous to use a long fiber web as the second absorbent body 1.

  The crimp rate of the long fibers is as described above, and the number of crimps is preferably 2 to 25, particularly 4 to 20, particularly 8 to 18 per cm.

  In the absorber 1, the web 2 is highly oriented in one direction. Therefore, the liquid absorbed by the absorber 1 is likely to diffuse in the orientation direction of the web 2. By utilizing this, in the present embodiment, the second absorbent body 1 is disposed on the diaper 10 so that the orientation direction of the web 2 coincides with the longitudinal direction of the diaper 10, and the liquid from the width direction of the diaper 10 is Leakage (so-called side leakage) is effectively prevented.

  As the superabsorbent polymer 3 embedded and supported on the web 2, particles are generally used. However, it may be fibrous. When using a particulate superabsorbent polymer, if the shape is an indeterminate type, a block type, or a bowl type, it should be embedded and supported by the basis weight of the same amount to 20 times the web 2. Can do. Further, in the case of a spherical particle aggregation type or a spherical type, it can be embedded and supported with a basis weight of the same amount or more and five times or less with respect to the web 2. For these particle shapes, it is desirable to select the former when it is particularly desired to achieve both high absorption and thinning, and the latter when importance is placed on the texture (reduction of the feeling of shaving of the superabsorbent polymer). The buried support refers to a state in which the superabsorbent polymer enters the space formed by the long fibers forming the web, and the polymer is not easily moved or dropped even by the violent movement of the wearer. . In the state of being buried and supported, the superabsorbent polymer is attached to the long fibers by being entangled or caught. Or it adheres to the long fiber by the adhesiveness of the superabsorbent polymer itself. The space formed by the long fibers is easily deformed when subjected to stress from the outside. However, since the stress can be absorbed by the entire long fiber, the space is prevented from being destroyed. A part of the superabsorbent polymer is embedded and supported in the web, or almost all of the superabsorbent polymer is uniformly embedded and supported in the web depending on the manufacturing conditions of the absorber.

  “Uniform” means the variation in the amount of the superabsorbent polymer in the thickness direction or width direction of the web when the superabsorbent polymer is completely uniformly arranged and when a part of the web is taken out. Means a case where the basis weight has a distribution within 2 times. Such variation is caused by the fact that, in the production of the absorbent body, a superabsorbent polymer is rarely supplied excessively, and a part with an extremely high application amount is partially generated. In other words, the above “uniform” includes cases where inevitably variations occur, and does not include cases where the superabsorbent polymer is distributed so as to intentionally vary.

  As described above, since the long fiber has crimps, it has a large number of spaces capable of holding particles. The superabsorbent polymer 3 is held in the space. As a result, even if a large amount of the superabsorbent polymer 3 is sprayed, the extreme movement and dropout are less likely to occur. Moreover, even if a wearer performs intense operation | movement, the structure of the absorber 1 becomes difficult to be destroyed. Depending on the superabsorbent polymer used, the crimp rate and the amount of long fibers used are adjusted as appropriate. If the web is composed only of long fibers that do not have crimps or have a small degree of crimp, and this is used as an absorbent body, when a large amount of superabsorbent polymer is used, its extreme movement and dropout may occur. It is easy to happen. On the other hand, if long fibers with a too high crimp rate are used, it is not easy to allow the superabsorbent polymer to enter between the long fibers. It is easy to happen.

  Since the superabsorbent polymer is stably held in the space formed by the crimped long fibers, the second absorbent body 1 can hold a large amount of the superabsorbent polymer. Even in the conventional absorbent body, if the amount of the fiber material is increased, a large amount of the superabsorbent polymer can be retained, but in this case, the basis weight and thickness of the absorbent body are increased. On the other hand, in the present invention, the amount of the superabsorbent polymer is relatively large with respect to the amount of the fiber material. Specifically, the basis weight of the superabsorbent polymer is preferably not less than the basis weight of the web, more preferably not less than 2 times, more preferably not less than 3 times when viewed from the whole absorbent body. Thereby, thickness reduction and weight reduction of the 2nd absorber 1 are achieved. As a result, the stretch response of the second absorbent body 1 is good. The upper limit of the ratio of the basis weight of the superabsorbent polymer to the basis weight of the web is determined from the viewpoint of extreme movement of the superabsorbent polymer and prevention of falling off. Depending on the degree of crimp of the long fibers, the upper limit is 20 times or less, preferably 15 times or less, and more preferably 10 times or less. Extreme movement and dropout are unlikely to occur.

  The supportability of the superabsorbent polymer on the long fiber web is related to the network structure formed by the web and the physical properties of the superabsorbent polymer. From the viewpoint of the network structure, in the present invention, the network is controlled by controlling the stereoregularity of the web, that is, the crimp ratio, fineness, density, etc. of the web, so that the supportability of the polymer is expressed. . In the present invention, since the constituent fibers of the web are not bonded to each other, the size of the mesh formed on the web can be changed to such an extent that the superabsorbent polymer can be retained. Since the size of the mesh in the web can be changed, the supportability of the polymer becomes higher than in the case where the superabsorbent polymer is supported on a fiber assembly having a bonding point such as a nonwoven fabric. The size of the mesh can be determined by, for example, (a) applying a superabsorbent polymer in a state where a fiber is tensioned and then releasing the tension, or (b) controlling the web tension in advance. It can be controlled by spraying a superabsorbent polymer under a state in which a shrinkage ratio is expressed and further applying tension or pressure to the web.

  On the other hand, the physical properties of the polymer related to the polymer supportability include shape, particle size distribution, particle size, bulk density, surface properties, internal friction coefficient, fluidity, dispersibility, moisture content, chargeability, adhesion, and aggregation. There is sex. Among these, the particle size distribution and particle size of the polymer are closely related to the above-described web network structure. The carrying ability of the superabsorbent polymer is also affected by the number of collisions between the polymer and the long fibers inside the absorbent body when an external force or vibration is transmitted to the absorbent body due to the movement of the wearer. The higher the number of collisions, the more the high-absorbent polymer is screened by the mesh created by the long fibers, resulting in lower supportability. The number of collisions is affected by the fluidity of the polymer. The number of collisions increases with higher fluidity polymers. In addition, the polymer having high fluidity and once escaped from the restraint of the web easily moves and becomes difficult to be supported on the web.

  As for the fluidity of the polymer, when comparing the bulk type polymer and the spherical particle aggregation type polymer, the spherical particle aggregation type polymer has higher fluidity than the bulk type polymer. As a result, the bulk type polymer has higher supportability than the spherical particle aggregation type polymer. Further, since the spherical particle aggregation type polymer has a smooth surface, the degree of friction with the fiber and the catching on the fiber is lower than that of the bulk type polymer. Also from this viewpoint, the bulk type polymer has higher supportability than the spherical particle aggregation type polymer.

  The superabsorbent polymer can be supported in the web more efficiently by carrying out various post-processing after the superabsorbent polymer is supported on the crimped long fiber web. Examples of the means include (1) wrapping the entire web with a sheet material such as paper or nonwoven fabric, or overlapping the sheet material, and (2) fluff pulp containing or not containing a superabsorbent polymer. And (3) constraining the web structure with bonding means using hot melt adhesive, heat, and ultrasonic waves.

As an evaluation of the extent to which the superabsorbent polymer is buried and supported, a loading rate measured by the following method can be employed. First, using a long fiber, a web having a uniform thickness of 200 mm in the longitudinal direction and 100 mm in the width direction is produced. At this time, the amount of long fibers is adjusted so that the basis weight of the web is 26 g / m ² . Thereafter, the web is stretched in the fiber orientation direction to adjust the crimp rate. By this operation, the basis weight of the web changes from the initial basis weight of 26 g / m ^2, so the weight of the web is measured and the exact basis weight is calculated. The polymer is sprayed with the crimp rate adjusted, and 100 × 200 mm is cut off. The polymer is dispersed by hand in a state where the web is laid sideways, and the superabsorbent polymer is uniformly dispersed by hand so that the basis weight of the polymer becomes 10 times the basis weight of the web. When the dispersion of the polymer is completed, the entire web is wrapped with a tissue having a basis weight of 16 g / m ² , compressed with a rubber roll, and then the elongation of the long fibers is released. The tissue and the web are bonded with an adhesive.
Next, a 100 mm × 100 mm measurement sample is cut out from the center of the web. When the tissue on the cut surface is pressure-bonded by cutting and the cut surface is blocked, the pressure-bonded state of the tissue on the cut surface is released. The cut measurement sample is suspended so that the long fibers are oriented in the vertical direction. Under this condition, the measurement sample is reciprocally oscillated in the horizontal direction at an amplitude of 5 cm and a speed of once per second. The weight of the polymer dropped by this reciprocating vibration is measured, and the value is defined as S1.
Then, using the value of S1 and the value of the superabsorbent polymer weight S0 (that is, 10 times the web weight) contained in the measurement sample before reciprocating vibration, the loading rate is calculated from the following equation.
Loading rate (%) = {1- (S1 / S0)} × 100
When the value of the loading rate measured in this way is 60% or more, particularly 70% or more, and particularly 80% or more, it can be said that the superabsorbent polymer is hardly detached.

As an evaluation of the degree to which the superabsorbent polymer is buried and supported, a migration rate measured by the following method can be employed in addition to the above-described loading rate. First, an initial weight W0 of a measurement sample of 100 mm × 100 mm used for the measurement of the carrying rate is measured in advance. The measurement sample after the measurement of the loading rate is cut in a direction perpendicular to the direction in which the long fibers extend, and is divided into two equal parts. The weight of each of the two halves divided into two is measured, and the weight of the halved fragment having the larger variation from 1/2 of the initial weight W0 of the measurement sample is adopted as the weight W1 for calculating the transfer rate. To do. For example, assuming that the weights of two fractional pieces are W1 ′ and W1 ″, if these W1 ′ and W1 ″ satisfy the following expression, W1 = W1 ′.
| W1'-W0 / 2 |> | W1 "-W0 / 2 |
Using the value of W1 determined in this way and the value of the initial weight W0 of the measurement sample, the movement rate is calculated from the following equation.
Movement rate (%) = {1-W1 / (W0 / 2)} × 100
When the value of the migration rate thus measured is 40% or less, particularly 30% or less, particularly 20% or less, it can be said that the migration of the superabsorbent polymer is difficult to occur.

  The following evaluation method can also be performed on the measurement sample in which the loading rate is measured. 50 g of physiological saline (0.9% by weight NaCl) is evenly sprayed on the measurement sample for which the loading rate was measured, and the way the measurement sample swells is visually observed. When the variation in the thickness of the measurement sample is within 2 times, it can be said that the superabsorbent polymer is hardly moved or dropped off.

  If the superabsorbent polymer is not sufficiently embedded in the web, use hot melt, various binders (for example, acrylic emulsion adhesives), sugar derivatives such as carboxymethyl cellulose and ethyl cellulose, thermoplastic resins such as polyethylene, etc. Can be added as appropriate. Furthermore, you may use together the sheet | seat etc. which gave uneven | corrugated processing or flocking.

  In order to embed and carry a superabsorbent polymer on a web made of crimped long fibers, for example, the following method can be used. First, a long fiber web having the above-described crimp rate is prepared. The web is opened by a predetermined means. For the opening, for example, an air opening device using compressed air can be used. Next, the opened web is stretched to a predetermined length. In this case, it is not necessary to stretch the long fiber completely, and it is sufficient to stretch the superabsorbent polymer so as to be stably embedded and held in the web.

Various adhesives such as hot melt pressure-sensitive adhesive are applied to the web with the long fibers stretched. For the coating, it is preferable to use a spray coating capable of successfully performing dot-like adhesion. The adhesive is preferably applied in such a low amount that the liquid does not pass through the web. Specifically preferred are coating weight from 1 to 20 g / m ^2, more preferably 2 to 10 g / m ^2, and more preferably from 3 to 7 g / m ^2.

  After the application of the adhesive is completed, the superabsorbent polymer is spread in layers on the web. Release the stretched state of the long fiber after spraying is completed. As a result, the stretched long fibers contract. As a result, the superabsorbent polymer is retained in the space formed by the shrinkage of the long fibers. In this way, the superabsorbent polymer is buried and supported in the web. If necessary, a web prepared separately may be overlaid thereon. As a result, the two webs are bonded in the form of dots.

  The web 2 in which the superabsorbent polymer 3 is embedded and supported is preferably wrapped with a liquid-permeable sheet 4. As the liquid permeable sheet 4, for example, a fiber material sheet, a perforated film, or the like can be used. From the viewpoint of good liquid permeation, the liquid permeable sheet 4 is preferably made of a hydrophilic fiber sheet. As the hydrophilic fiber sheet, paper such as tissue paper and various non-woven fabrics can be used. Examples of the non-woven fabric include non-woven fabrics made of hydrophilic fibers such as cotton and rayon, and non-woven fabrics made by subjecting synthetic resin fibers to a hydrophilic treatment. Specific examples include a spunbond nonwoven fabric, a spunlace nonwoven fabric, an airlaid nonwoven fabric, and an air-through nonwoven fabric. Moreover, the nonwoven fabric which consists of various elastomer resins, such as polyolefin resin, polyester resin, and polyurethane resin, may be sufficient.

The basis weight of the liquid permeable sheet 4 is one of the factors that affect the liquid permeability of the sheet 4 and the flexibility and fit of the absorbent body 1. From this viewpoint, the basis weight of the liquid-permeable sheet 4 is preferably 5 to 25 g / m ² , particularly preferably 10 to 40 g / m ² .

  For example, the web 2 in which the superabsorbent polymer 3 is embedded and supported and the liquid permeable sheet 4 are combined with the liquid permeable sheet 4 with a hot melt adhesive or the like in the stretched state. Can do. In the absorbent body 1 thus obtained, the web 2 contracts in the orientation direction due to the contraction force of the crimped hydrophilic long fibers. As the shrinkage occurs, the liquid-permeable sheet also shrinks. Therefore, the absorbent body 1 having such a configuration can be extended in the orientation direction of the web 2 without subjecting the liquid-permeable sheet itself to stretching.

  In order to further improve the extension range of the absorbent body 1, as shown in FIG. 3, the liquid-permeable sheet 4 may be processed so that the sheet 4 can be extended. As a result, the absorber 1 as a whole can be expanded and contracted in the orientation direction of the web 2. Specifically, since the web 2 in the absorbent body 1 has crimped hydrophilic long fibers, it inherently has stretchability in the orientation direction. In addition to this, if the liquid-permeable sheet 4 can be extended, the absorbent body 1 can be extended as a whole. On the other hand, when the stretched state of the absorbent body 1 in the stretched state is released, the web 2 contracts in the orientation direction due to the shrinkage force caused by the crimped hydrophilic long fibers. With this contraction, the liquid permeable sheet 4 also contracts. By such a mechanism, the absorber 1 as a whole can be expanded and contracted in the orientation direction of the web 2.

  The direction of expansion and contraction of the absorbent body 1 does not depend on the orientation direction of the hydrophilic web 2 having long fibers. This is because the long fibers have crimps, and the web 2 can be stretched in the orientation direction, the direction orthogonal to the orientation direction, and any other direction. This is the same whether the long fibers are bonded or not. The direction of expansion and contraction of the absorbent body 1 depends on the direction in which the liquid-permeable sheet 4 that wraps the web 2 can be extended. That is, if the liquid-permeable sheet 4 can be extended only in a certain direction, the absorber 1 can be expanded and contracted only in that direction. When a nonwoven fabric or a woven fabric is used as the liquid permeable sheet 4, the nonwoven fabric or the woven fabric has extensibility in the direction orthogonal to the fiber orientation direction. It is not limited to the orientation direction. However, the maximum elongation (easiness of elongation) of the absorbent body 1 can have anisotropy. That is, when the liquid permeable sheet 4 is not processed to be stretchable, the nonwoven fabric, the woven fabric, and the like have a large maximum point elongation in the fiber orientation direction, and in a direction orthogonal to the fiber orientation, compared to the fiber orientation direction. The maximum point elongation is small.

  Since the second absorbent body 1 can be expanded and contracted, the leg flap 15 of the diaper 10 provided with the absorbent body 1 has good fit to the wearer's body. The improvement of the fit becomes more remarkable by arranging the leg elastic strands 15 a on the leg flap 15. In this case, the second absorbent body 1 is incorporated in the diaper 10 so that the expansion / contraction direction of the second absorbent body 1, that is, the orientation direction of the web 2 coincides with the expansion / contraction direction of the leg elastic strand 15 a.

  In the second absorbent body 1, as shown in FIG. 3, the liquid permeable sheet 4 is slit so that a large number of slits 5 extending in the direction intersecting the orientation direction of the web 2 are formed. In the present embodiment, the slit 5 extends in a direction orthogonal to the orientation direction of the web 2. However, the direction in which the slit 5 extends is not limited to this, and the direction in which the slit 5 extends intersects with the orientation direction of the web 2 as long as the liquid-permeable sheet 4 can substantially extend in the orientation direction of the web 2. It may be a direction.

  Since a large number of slits 5 extending in the direction orthogonal to the orientation direction of the web 2 are formed in the liquid-permeable sheet 4, when the absorbent body 1 is stretched in the orientation direction of the web 2, the slits 5 are formed as shown in FIG. The liquid permeable sheet 4 is elongated by opening. As a result, the entire absorbent body 1 extends.

In order to improve the stretch response of the second absorbent body 1, the second absorbent body 1 is preferably thin and has a low basis weight. Specifically, the web 2 preferably has a basis weight of 5 to 200 g / m ² , particularly 10 to 100 g / m ² . On the other hand, the spreading basis weight of the superabsorbent polymer is preferably 50 to 500 g / m ² , particularly preferably 100 to 300 g / m ² . The total basis weight of the web 2 and the superabsorbent polymer 3 is preferably 120 to 400 g / m ² , particularly 150 to 300 g / m ² . The second absorbent body 1 is preferably a thin one having a thickness of 0.5 to 4 mm, particularly 1 to 3 mm.

  In addition to the superabsorbent polymer, the second absorbent body 1 is made of other particles such as activated carbon, silica, alumina, titanium oxide, organic or inorganic particles such as various viscosity minerals (zeolite, sepiolite, bentonite, cancrinite, etc.) Deodorant and antibacterial agent) may be included. As the inorganic particles, those partially substituted with metal sites can be used. Alternatively, various organic and inorganic buffering agents, that is, acetic acid, phosphoric acid, citric acid, succinic acid, adipic acid, malic acid, lactic acid and salts thereof may be used alone or in combination, and various amino acids may be included. . The function of these components is to suppress the odor of the liquid absorbed by the absorber 1 and the odor derived from the material. In addition, various organic and inorganic buffer agents have the effect of neutralizing excrement, for example, ammonia generated by decomposition of urine, and keeping the diaper neutral to weakly acidic. Even if there is liquid return of excrement to the skin, the effect on the skin is reduced. Alternatively, the use of a fiber having an ester in its molecular structure such as an acetate fiber as the long fiber web can be expected to prevent alkali damage.

  In addition, hydrophilic fine powder or short fibers can coexist in the web 2 for the purpose of improving the liquid retention and absorption rate and improving the dryness. Examples of hydrophilic fine powders or short fibers include fibrillated or non-fibrillated cellulose powder, carboxymethyl cellulose and its metal salt, carboxyethyl cellulose and its metal salt, hydroxyethyl cellulose and its derivatives, silk powder, nylon powder, Examples include short fibers such as rayon, cotton, and wool. Among these, it is preferable to use cellulose powder because the above effects can be improved to the maximum. The hydrophilic fine powder or short fiber may be sprayed on the web before spraying the superabsorbent polymer, or may be mixed with the superabsorbent polymer and sprayed on the web at the same time.

  The second absorbent body 1 is preferably flexible. As an evaluation of flexibility, a measured value by a handle-ometer can be used. The measured value is preferably 4N or less, particularly 2N or less. The measuring method using the handle-o-meter conforms to JIS L1096 (flexibility measurement method). An absorbent body cut by 150 mm in the longitudinal direction and 100 mm in the width direction is arranged in a direction perpendicular to the groove on a support base in which a groove having a width of 60 mm is carved. The force required when the center of the absorber is pushed by a blade having a thickness of 2 mm is measured. The apparatus used in the present invention is a texture testing machine (handle-of-meter method), HOM-3 type, manufactured by Daiei Scientific Instruments. The average value of the three points is taken as the measured value. The absorber is sampled to a size of 150 mm in the longitudinal direction and 50 mm in the width direction. Since the elastic member is arranged near the second absorber of the leg flap part, sampling is performed with the leg flap part extended to the maximum, and the measurement is performed with the leg flap part naturally contracted (the tension is released). ).

  According to the diaper 10 shown in FIG. 1 and FIG. 2, since the liquid flowing over the three-dimensional guard 16 and flowing out in the lateral direction is absorbed by the second absorbent body 1 disposed on the leg flap 15, Leakage from the liquid is effectively prevented. Moreover, since the orientation direction of the web in the second absorbent body 1 coincides with the longitudinal direction of the diaper 10, the liquid absorbed by the second absorbent body 1 is preferentially diffused in the longitudinal direction of the diaper 10. This also effectively prevents liquid leakage from around the legs. In particular, since the second absorbent body 1 expands and contracts in the same direction as the leg elastic strand 15a disposed on the leg flap 15, the leg flap 15 fits snugly around the wearer's leg when the diaper 10 is worn. It is difficult for a gap to be formed between the leg flap 15 and the wearer's body. As a result, liquid leakage from around the legs is more effectively prevented. In the case of using a conventional absorbent body mainly composed of pulp, when trying to give stretchability to the absorbent body, it is necessary to use a thicker and more leg elastic strand, thereby producing a large amount of adhesive. An agent was required, causing inconveniences such as stickiness and reduced flexibility. Furthermore, in order to ensure a high absorption capacity, the absorber becomes thick, thereby causing the disadvantage of a decrease in fit. On the other hand, if the elastic second absorbent body 1 having a web is used, such inconveniences of the conventional absorbent body can be solved.

  As a modification of the diaper shown in FIGS. 1 and 2, the diaper shown in FIG. 5 can be exemplified. 5 is a cross-sectional view taken along line VV in FIG. A VV line in FIG. 1 is a portion corresponding to the ventral part of the diaper 10. This portion is a portion where so-called pre-leakage is likely to occur and a high absorption capacity is required for the absorber. In this portion, a web 19 having hydrophilic long fibers is disposed between the central absorbent 13 and the water repellent nonwoven fabric 14. The web 19 connects the left and right second absorbers 1 and 1 with respect to the movement of the liquid. The web 19 is highly oriented in a direction that coincides with the width direction of the diaper 10.

  As the web 19, the same thing as the web 2 which comprises the 2nd absorber 1 can be used. However, in some cases, the web 19 may not have the superabsorbent polymer embedded and supported, and the long fibers constituting the web 19 may not be crimped.

  According to the diaper 10 shown in FIG. 5, the liquid that has passed over one of the three-dimensional guards 16 and has flowed in the lateral direction of the diaper is absorbed by the second absorbent body 1 disposed on one leg flap 15. The liquid absorbed in one of the second absorbers 1 is quickly diffused toward the central region in the width direction of the diaper 10 by the web 19 connecting the left and right second absorbers 1, 1 and has a high absorption capacity. Guided to the body 13. And it is absorbed by the central absorber 13. That is, liquid feedback from the second absorber 1 to the central absorber 13 occurs. Furthermore, the liquid passes through the central absorbent 13 and reaches the other second absorbent 1 where it is absorbed. By such an absorption mechanism of the liquid, the absorption performance of the absorber can be effectively utilized as a whole, and the liquid leakage can be further effectively prevented.

  As a modification of the diaper shown in FIGS. 1 and 2, the diaper shown in FIG. 6 can also be cited. FIG. 6 is a cross-sectional view taken along the line II-II in FIG. 1 and corresponds to FIG. In the diaper shown in FIG. 6, a web 19 having hydrophilic long fibers is disposed between the central absorbent body 13 and the water repellent nonwoven fabric 14. The web 19 connects the left and right second absorbers 1 and 1 with respect to the movement of the liquid. The web 19 is highly oriented in a direction that coincides with the width direction of the diaper 10. As the web 19, the same thing as what is used for the diaper shown in FIG. 5 can be used. A liquid-impermeable or water-repellent sheet 20 is disposed between the web 19 and the central absorbent 13 to isolate the web 19 and the central absorbent 13 with respect to liquid movement.

  According to the diaper 10 shown in FIG. 6, the liquid that has passed over the one-dimensional guard 16 and started to flow in the lateral direction of the diaper is absorbed by the second absorbent body 1 disposed on the one leg flap 15. The liquid absorbed in one of the second absorbent bodies 1 is quickly diffused toward the central region in the width direction of the diaper 10 by the web 19 connecting the left and right second absorbent bodies 1 and 1. Since the web 19 and the central absorbent body 13 are separated by the sheet 20, the liquid diffusing through the web 19 reaches the other second absorbent body and is absorbed there. As described above, in the diaper 10 shown in FIG. 6, the liquid is distributed between the pair of second absorbent bodies. Also by this liquid distribution, the absorption performance of the absorber can be effectively utilized as a whole. This liquid distribution is different from the diaper shown in FIG. 5 in which liquid distribution occurs between the second absorbent body 1 and the central absorbent body 13. The reason why the liquid distribution is different between the diaper shown in FIG. 5 and the diaper shown in FIG. 6 is that the structure of the diaper shown in FIG. 5 is related to the front side of the diaper that is relatively wide and requires a high absorption capacity. On the other hand, the structure of the diaper shown in FIG. 6 is related to the lower part of the diaper where the width is relatively narrow and a high absorption capacity is not required.

  Next, 2nd and 3rd embodiment of the absorber of this invention is described, referring FIG.7 and FIG.8. For the points that are not particularly described with respect to these embodiments, the description in detail regarding the first embodiment is applied as appropriate. Moreover, in FIG.7 and FIG.8, the same code | symbol is attached | subjected to the same member as FIGS.

In the second embodiment shown in FIG. 7, the liquid permeable sheet 3 in the second absorbent body 1 is subjected to creping or pleating. These processes are performed so that a large number of ridges or pleats extending in a direction orthogonal to the orientation direction of the web 2 are formed. The creping process is a process performed mainly when the liquid-permeable sheet 3 is made of paper, and is generally performed using a doctor blade. A preferred crepe rate is at least 10%, more preferably 20%. The crepe rate is calculated by the following formula from the amount of change in dimensions after a sample cut to 100 mm × 100 mm in a standard state is dipped in water and then pulled up.
Crepe rate (%) = ((dimension after being immersed in water) / (dimension before being immersed in water) -1) × 100
On the other hand, the pleating process is a process performed mainly when the liquid-permeable sheet 4 is made of a nonwoven fabric. The liquid permeable sheet that has been subjected to creping or pleating has a slack due to the formation of wrinkles or pleats. Therefore, the liquid permeable sheet has extensibility to the extent that the slack is stretched.

  In 3rd Embodiment shown in FIG. 8, the whole 2nd absorber 1 is shaped by the waveform. That is, the web 2 and the liquid permeable sheet 3 constituting the second absorbent body 1 are shaped into a waveform. The waveform shaping extends in the orientation direction of the web 2. In order to manufacture the second absorbent body 1 having such a shape, an operation of passing the absorbent body made of the web 2 wrapped with the liquid-permeable sheet 4 between a pair of rolls made of gears meshing with each other is performed. Do. As a result, the waveform shaping process is simultaneously applied to the web 2 and the liquid-permeable sheet 4. The liquid permeable sheet 4 that has been subjected to the waveform shaping process has extensibility due to the waveform shape.

  Moreover, in the absorbent article which has the absorber which concerns on this invention, you may give the process which can be extended | stretched not only to the liquid-permeable sheet 4 which wraps the web 2, but to a surface sheet. The processing applied to the liquid-permeable sheet and the surface sheet may be the same or different. For example, after the surface sheet and the absorber are combined, the surface sheet may be processed to be stretchable. Alternatively, the liquid-permeable sheet may be subjected to a stretchable process (for example, slit process), and then a top sheet subjected to another stretch process (for example, a pleat process) may be combined. Furthermore, after a stretchable process (for example, slit process) is performed on the liquid-permeable sheet, a stretchable surface sheet, for example, an apertured film or an apertured nonwoven fabric, may be laminated.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment, A various change is possible. For example, in the diaper 10 of the said embodiment, the center absorber 13 can also be comprised from the laminated fiber body of a flap pulp and a superabsorbent polymer similarly to the conventional absorber, or a superabsorbent polymer is buried. It can also be constituted by a stretchable absorbent body provided with a web having supported hydrophilic crimped continuous fibers. In the latter case, the orientation direction of the web is preferably matched with the longitudinal direction of the diaper 10. Further, the web may be wrapped with a liquid permeable sheet as shown in FIG. 3, FIG. 7, or FIG.

  Further, the second absorbent body 1 may be disposed on each leg flap 15 of the diaper 10 and the central absorbent body 13 may not be disposed between the leg flaps. When the central absorbent body 13 is not disposed between the leg flaps, an absorbent pad such as a urine removing pad that can be attached and detached may be attached between the leg flaps.

  Moreover, in the diaper 1 of the said embodiment, although the 2nd absorber 1 was distribute | arranged above the leg elastic strand 15a of a leg flap, it replaces with this, or the lower side or the side (with respect to a center absorber) of a leg elastic strand. A second absorbent body may be disposed on the outer side of the leg elastic strand.

  Moreover, you may distribute the 2nd absorber which concerns on this invention in site | parts other than a leg flap. For example, the second absorbent body is disposed on the waist part or the three-dimensional gather part, which is an elastic region extending in the longitudinal direction or the width direction, on the left and right side parts or the front and rear end parts of the diaper outside the peripheral edge of the central absorbent body. can do. In the case where the second absorbent body is disposed in the waist portion, it is possible to mainly improve the leakage prevention performance from around the waist. When arranged in the three-dimensional gather part, the leakage prevention performance mainly from the crotch part can be improved. Or you may distribute a 2nd absorber in combination in these 2 or more site | parts. It is possible to design the leakage prevention performance to be improved according to the combination of the arrangement locations. For example, when the second absorbent body is disposed on the waist portion and the leg flap, respectively, or when the second absorbent body is disposed on the waist portion and the three-dimensional gather portion, the leakage from the waist and the leg portion is suppressed. Can do. Further, when the second absorbent body is disposed on each of the three-dimensional gathers and the leg flaps, leakage from the crotch can be more effectively suppressed than when each is used alone.

  In the diaper 10, a stretchable absorbent body including a web having hydrophilic crimped long fibers embedded with a superabsorbent polymer may be disposed on the waist flap 17. Further, the web may be wrapped with a liquid permeable sheet as shown in FIG. 3, FIG. 7, or FIG. In that case, the absorber is arranged so that the orientation direction of the web coincides with the width direction of the diaper. By doing so, the absorbed liquid can be diffused in the width direction of the diaper, and liquid leakage from the waist opening can be effectively prevented.

In the embodiment shown in FIGS. 5 and 6, the water repellent nonwoven fabric 14 may not be used. In that case, the leg elastic strands 15a may be sandwiched and fixed by the back sheet 12 and the liquid permeable sheet 4 constituting the absorber 1.

  In each of the above embodiments, the fiber material contained in the absorbent body is composed of a hydrophilic long fiber web, but in addition to the long fibers, the stretchability of the absorbent body is not inhibited. Ordinarily used liquid-absorbing fibers such as flap pulp or synthetic resin short fibers may be blended in the absorber.

  The present invention can also be applied to absorbent articles other than disposable diapers, such as sanitary napkins and incontinence pads. Moreover, in the absorbent article using the absorbent body according to the present invention, as a method of forming an elastic region in the leg part or the waist part, an elastic member such as a thread rubber is fixed under extension as in the prior art to release the tension. In addition to the method of doing, there is a method of using a stretchable material that can be extended from a natural state. Examples of the stretchable material include a stretchable sheet obtained by combining a stretchable nonwoven fabric with a nonstretchable nonwoven fabric and then cutting the nonstretchable nonwoven fabric. In particular, when the latter elastic material is used, there is an advantage that a mark due to tightening is difficult to touch the skin. When the latter stretchable material is used in combination with a conventional non-stretchable absorber, the stretchable physical properties of the stretchable material are impaired, but the stretchable material is used in combination with the stretchable absorber according to the present invention. As a result, it has become possible to achieve both the prevention of traces and the expansion / contraction characteristics.

[Example 1]
The 2nd absorber used for the disposable diaper for babies was manufactured. First, a crimped acetate fiber web was prepared. The fiber diameter of this fiber was 2.1 dtex, and the total fiber amount of the web was 25,000 dtex. This web was opened to a width of 50 mm using an air opening device to obtain a spread web. The spread web was stretched to the maximum stretch length. Under this condition, a hot melt adhesive was spray coated on the upper surface of the spread web. The coating amount was 5 g / m ² . Subsequently, the superabsorbent polymer particles were uniformly sprayed in a layered manner at a spraying basis weight of 100 g / m ² on the coated surface of the hot melt adhesive. After the completion of spraying, another spread web was layered and wrapped with a spunbond-meltblown-spunbond nonwoven fabric (SMS) having a basis weight of 16 g / m ² that was hydrophilized so that the web was stretched to release the stretched state. . As a result, the spread web contracted to obtain a second absorbent body in which particles of the superabsorbent polymer were embedded and supported in the spread web. At this time, the crimp rate of the web was 30%, the number of crimps per 1 cm of the fiber was 15, the loading rate of the second absorbent body including this web was 95%, and the transfer rate was 11%. The basis weight of the entire second absorbent body was 173 g / m ² and the thickness was 1.0 mm. The basis weight of each web was 13 g / m ² .

The disposable diaper shown in FIG. 1 was manufactured using the obtained second absorbent body. An air-through nonwoven fabric having a basis weight of 25 g / m ² was used as the surface sheet. The air-through nonwoven fabric was composed of a core-sheath type composite fiber (thickness: 2.1 dtex, surface treatment with a surfactant and liquid permeability) having a core made of polypropylene and a sheath made of linear low density polyethylene. The surface sheet was subjected to a hole opening treatment with a metal pin having a diameter of 5 mm. A porous film having a basis weight of 20 g / m ² as a backsheet, used was composite by bonding a polypropylene spunbond nonwoven fabric having a basis weight of 20 g / m ² hot melt 1.5 g / m ^2. The porous film is formed by uniformly blending 100 parts by weight of a linear low density polyethylene resin having a density of 0.925 g / cm ³ with 150 parts by weight of calcium carbonate and 4 parts by weight of an ester compound as a third component. The film was uniaxially stretched twice in the longitudinal direction. As the central absorbent body, the mixture of the total basis weight of 520 g / m ² obtained by uniform mixing in flowing air fluff pulp 100 parts by weight of the opening and the superabsorbent polymer 100 parts by weight, basis weight 16g / m ² Wrapped with tissue paper. The basis weights of fluff pulp and superabsorbent polymer in the mixture were 260 g / m ² , respectively. Other than that, according to the manufacturing method of a normal disposable diaper, the disposable diaper was obtained.

[Example 2]
First, a crimped acetate fiber web was prepared. The fiber diameter of this fiber was 2.1 dtex, and the total fiber amount of the web was 25,000 dtex. This web was opened to a width of 50 mm using an air opening device to obtain a spread web. The spread web was stretched to the maximum stretch length. Under this condition, a hot melt adhesive was spray coated on the upper surface of the spread web. The coating amount was 5 g / m ² . Subsequently, the superabsorbent polymer particles were uniformly sprayed in a layered manner at a spraying basis weight of 100 g / m ² on the coated surface of the hot melt adhesive. After the completion of spraying, another spread web was layered and wrapped with a spunbond-meltblown-spunbond nonwoven fabric (SMS) having a basis weight of 16 g / m ² that was hydrophilized so that the web was stretched to release the stretched state. . As a result, the spread web contracted and the superabsorbent polymer particles were embedded and supported in the spread web. Then, the whole was wrapped with a spunbond-meltblown-spunbond nonwoven fabric (SMS) having a basis weight of 16 g / m ² subjected to a hydrophilization treatment and slit processing to obtain a second absorbent body. At this time, the crimp rate of the web was 30%, the number of crimps per 1 cm of the fiber was 15, the supporting rate of the second absorbent body containing this web was 95%, and the transfer rate was 11%. The entire second absorbent body is slit in a direction orthogonal to the orientation direction of the web. The slit processing was performed so as to penetrate through the absorber in the thickness direction of the second absorber. As shown in FIG. 9, the slits are formed such that one slit has a width of 2 mm, an interval between adjacent slits in the width direction is 2 mm, and a slit interval in the longitudinal direction is 2 mm. did. The slit was formed so that its longitudinal direction was perpendicular to the orientation direction of the web. Except these, it carried out similarly to Example 1, and obtained the disposable diaper.

Example 3
In Example 1, the obtained 2nd absorber was used for the waist part and the leg part, and it carried out similarly to Example 1, and obtained the disposable diaper.

Example 4
In Example 2, the disposable diaper was obtained like Example 2 except having manufactured the center absorber as follows. First, a crimped acetate fiber web was prepared. The fiber diameter of this fiber was 2.1 dtex, and the total fiber amount of the web was 25,000 dtex. The web was opened to a width of 100 mm using an air opening device to obtain a spread web. The spread web was stretched to the maximum stretch length. Under this condition, a hot melt adhesive was spray coated on the upper surface of the spread web. The coating amount was 5 g / m ² . Subsequently, the superabsorbent polymer particles were uniformly sprayed in a layered manner with a spraying basis weight of 130 g / m ² on the coated surface of the hot melt adhesive. After spreading, the spread state of the spread web was released. As a result, the spread web contracted to obtain a first laminate in which the superabsorbent polymer particles were embedded and supported in the spread web. Thereafter, the same operation as this operation was repeated once more to obtain a second laminate composed of a web in which superabsorbent polymer particles were embedded and supported. A fluff pulp layer having a basis weight of 50 g / m ² was sandwiched between the first laminate and the second laminate thus obtained.

Further, a fluff pulp layer having a basis weight of 100 g / m ² was disposed under the second laminate, and the whole was wrapped with a tissue paper having a basis weight of 16 g / m ² to obtain a central absorbent body. At this time, the crimp rate of the web was 30%, the number of crimps per 1 cm of the fiber was 15, the loading rate of the central absorbent including this web was 95%, and the transfer rate was 11%. The entire central absorbent body is slit in a direction perpendicular to the web orientation direction. As shown in FIG. 9, the slits are formed such that one slit has a width of 2 mm, a distance between adjacent slits in the width direction is 2 mm, and a slit distance in the longitudinal direction is 2 mm. did. The slit was formed so that its longitudinal direction was perpendicular to the orientation direction of the web. As a result, the absorber can be expanded and contracted in the orientation direction of the web. In the central absorbent body, a fluff pulp layer having a basis weight of 100 g / m ² is located on the side farthest from the skin. The basis weight of the entire absorbent body was 488 g / m ² and the thickness was 2.2 mm. The basis weight of each web was 13 g / m ² .

[Comparative Example 1]
In Example 1, the disposable diaper was obtained like Example 1 except having manufactured the 2nd absorber as follows. The mixture of the total basis weight of 200 g / m ² obtained by homogeneously mixed in an air stream and opening the fluff pulp 100 parts by weight of the superabsorbent polymer 100 parts by weight, of basis weight 16g / m ² with tissue paper Wrapping and obtaining a second absorber. The basis weights of fluff pulp and superabsorbent polymer in the mixture were 100 g / m ² , respectively. Between the mixture and the tissue paper, 5 g / m ² of hot melt pressure-sensitive adhesive was spray-coated to adhere both. The basis weight of the entire second absorbent body was 242 g / m ² and the thickness was 2.1 mm.

[Performance evaluation]
About the absorber in the diaper obtained by the Example and the comparative example, the softness | flexibility and structural stability were evaluated with the following method. Moreover, fit property was evaluated about the diaper. The results are shown in Table 1 below.

[Flexibility]
The absorber was subjected to a handle-ometer test, and the flexibility was evaluated according to the following criteria. The smaller the value, the better the contactability and fit.
○: The measured value of the handle-o-meter is 2N or less.
(Triangle | delta): The measured value of a handle ohm meter exceeds 2N and is 4N or less.
X: The measured value of the handle o meter exceeds 4N.

[Structural stability]
(1) At the time of dry The center part of the absorber produced to 50 mm x 200 mm was cut | disconnected, and the absorber of 50x100 mm was obtained. The amount of polymer dropped from the cut surface was measured when the vibration was applied 20 times at a speed of 1 cm / second with an amplitude of 5 cm with the cut surface directly below. The embedding supportability of the superabsorbent polymer was evaluated according to the following criteria.
Of the mixed superabsorbent polymers,
◯: The ratio of the superabsorbent polymer that has fallen out exceeds 0% and is 10% or less.
(Triangle | delta): The quantity of the superabsorbent polymer which dropped out exceeds 10% and is 25% or less.
X: The amount of the superabsorbent polymer dropped off exceeds 25%. (2) When wet The absorbent body was almost uniformly absorbed on the entire surface of the absorbent body cut to 50 × 200 mm, and then the absorbent body was gently lifted. At that time, it was visually determined whether or not the absorber was destroyed.
○: The ratio of the superabsorbent polymer dropped off is 10% or less, and the absorber is not destroyed.
(Triangle | delta): The ratio of the superabsorbent polymer which dropped out exceeds 10% and is 25% or less, and there is no destruction of an absorber.
X: The ratio of the superabsorbent polymer dropped off exceeds 25%, or the absorber is destroyed.

[Fitness]
The obtained diapers were attached to 5 infants (7 to 14 months) using M size diapers, and their mother's impression was heard.
○: It fits neatly and the crotch is not stiff.
Δ: A little clear.
X: There is a feeling of muffledness, it is not refreshing, and it does not fit.

  As is clear from the results shown in Table 1, the absorbent body in the diaper of each example has a stable structure of the absorbent body, although the use ratio of the fiber material is less than that in the absorbent body of the comparative example. I know that. Moreover, it turns out that it is flexible and the diaper's contact ease and fitting property are favorable.

It is a perspective view which shows the disposable diaper as an example of the absorbent article of this invention. It is the II-II sectional view taken on the line in FIG. It is a perspective view which shows one Embodiment of a 2nd absorber. It is a perspective view which shows the state which extended the 2nd absorber shown in FIG. It is the VV sectional view taken on the line in FIG. It is the II-II sectional view taken on the line in FIG. 1 (FIG. 2 equivalent view). It is sectional drawing which shows another embodiment of the stretchable absorber of this invention. It is sectional drawing which shows another embodiment of the stretchable absorber of this invention. FIG. 6 is a schematic diagram showing a slit formation state in Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 2nd absorber 2 Web 3 Polymer layer 4 Liquid permeable sheet 5 Slit 10 Disposable diaper 13 Central absorber

Claims (7)

An absorbent article having an elastic region extending in the longitudinal direction and / or the width direction on both the left and right side portions and / or the front and rear ends, and an absorbent body arranged in the elastic region,
The absorbent body has a web having hydrophilic crimped long fibers embedded and supported with a superabsorbent polymer and has a stretch property, and the web is highly oriented in one direction. .   The absorptivity according to claim 1, further comprising: an elastic region having a pair of leg flaps and having elastic strands on both left and right side portions of the central absorbent body, wherein the absorbent body is disposed above, below, or on the side of the elastic strand. Goods.   The absorbent article according to claim 1, wherein the orientation direction of the web in the absorbent body coincides with the longitudinal direction of the absorbent article.   The absorptive article according to claim 2 or 3 with which the expansion and contraction direction of the elastic strand arranged by leg flap is in agreement with the orientation direction of the web in said absorber.   The absorbent article according to any one of claims 1 to 4, wherein the crimped ratio of the crimped continuous fibers is 10 to 60%. The absorbent body is configured by wrapping a web having hydrophilic crimped continuous fibers embedded with a superabsorbent polymer with a liquid-permeable sheet,
The absorbent according to any one of claims 1 to 5, wherein the liquid permeable sheet is processed so that the sheet can be stretched, and the absorbent body as a whole is stretchable in the orientation direction of the web. Goods. A central absorbent is provided in the central part, the central absorbent is provided with a hydrophilic web having long fibers embedded and supported with a superabsorbent polymer, and the orientation direction of the web coincides with the longitudinal direction of the absorbent article. The absorbent article according to any one of claims 1 to 6.

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