TWI391129B - Absorbent items - Google Patents

Description

Absorbent article

The invention relates to a sanitary napkin, a sanitary pad, a vaginal secretion pad, an incontinence pad, a diaper and the like.

Previously, for absorbent articles, they were required to be leakproof, and various proposals were made. For example, as one of the leak prevention methods, there is a possibility that no gap is formed between the skin abutting surface of the absorbent article and the skin of the wearer. In order to prevent the occurrence of a gap, it is effective that the absorbent article closely follows the action of the wearer and that the absorbent article is extensible (for example, refer to Japanese Patent Laid-Open No. Hei 10-508225). The absorbent article is characterized in that it has flexibility and is stretched and stretched together with the undergarment.

Further, an absorbent body having an extensibility is known (for example, see Japanese Patent Laid-Open Publication No. Hei 5-504699). This absorption system is disposed two-dimensionally between a plurality of material bodies made of a superabsorbent material and fiber fluff, and is disposed between the elastic layers woven by the elastic yarn.

It is conceivable that the absorbent article disclosed in Japanese Laid-Open Patent Publication No. Hei 10-508225 is stretched together with the undergarment in a state of being attached to the undergarment, but does not perform any absorption property when the absorbent article is stretched. The design of the decline.

In the absorbent body disclosed in Japanese Laid-Open Patent Publication No. Hei 5-504699, if the absorbent body is stretched, a gap is formed between the main bodies of the materials to be absorbed. Therefore, the liquid leaks through the gap, and the absorption performance is lowered as compared with before the elongation.

The present invention provides an absorbent article that can solve various disadvantages of the prior art described above.

The present invention is an absorbent article having an absorbent layer and a leakage preventing layer and being substantially elongated. The absorbing layer is formed by laminating a first fiber layer forming a skin abutting surface, a second fiber layer disposed on the side of the leakage preventing layer, and a third fiber layer interposed between the two layers.

The third fibrous layer has stretchability in the longitudinal direction of the absorbent article, the first fibrous layer is mainly composed of thermoplastic fibers, and the second fibrous layer is mainly composed of hydrophilic fibers.

The first fiber layer and the third fiber layer, and the third fiber layer and the second fiber layer are partially joined together.

The leakage preventing layer has extensibility in the longitudinal direction, and the entire absorbent article has stretchability in the longitudinal direction.

Since the absorbent article of the present invention has stretchability in the longitudinal direction thereof, it adheres to the skin of the wearer and softly follows the movement of the user without moving, and has a good wearing feeling.

Hereinafter, a preferred first embodiment of the absorbent article of the present invention will be described with reference to Figs. 1 to 4 .

As shown in FIGS. 1 and 2, the sanitary napkin 1 as the absorbent article of the present embodiment includes the absorbent layer 10 and the leakage preventing layer 11 and is substantially vertically elongated.

Further, as shown in FIGS. 3 and 4, the absorbent layer 10 of the sanitary napkin 1 of the present embodiment is a first fibrous layer 21 which forms a skin contact surface, and a second fibrous layer which is disposed on the side of the leakage preventing layer 11 22, and the third fibrous layer 23 located between the two layers is laminated, the third fibrous layer 23 is stretchable in the longitudinal direction of the sanitary napkin 1, the first fibrous layer 21 is mainly composed of thermoplastic fibers, and the second fibrous layer 22 is formed. Mainly composed of hydrophilic fibers, and partially joined between the first fiber layer 21 and the third fiber layer 23 and between the third fiber layer 23 and the second fiber layer 22, and the leakage preventing layer 11 is at the length of the sanitary napkin 1. The direction is flexible, and the entire sanitary napkin 1 is also stretchable in the longitudinal direction. In the present embodiment, the leakage preventing layer 11 is a liquid-impermeable back surface thin layer 3. An important portion of the absorbing layer 10 surrounded by a circle in Fig. 2 is shown enlarged in Fig. 3.

Further, in the absorbent layer 10 of the sanitary napkin 1 of the present embodiment, the first fibrous layer 21 and the third fibrous layer 23 have the same shape in plan view, and are longitudinally elongated and have a length direction and a length of the sanitary napkin 1. The direction is the same. The second fiber layer 22 has a vertically long shape and has the same length direction as the longitudinal direction of the sanitary napkin 1, and has the same length as the first fiber layer 21 and the third fiber layer 23. As shown in FIG. 1, the width of the second fiber layer 22 is formed to be narrower than the first fiber layer 21 and the third fiber layer 23, and is disposed in the center in the width direction of the surface of the third fiber layer 23 on the back surface layer 3 side. unit. The central portion in the width direction means that both ends in the width direction are not included.

The absorbing layer 10 having the above-described structure has a three-layer structure at the central portion in the width direction and a two-layer structure at both end portions in the width direction. In the present embodiment, each of the fiber layers constituting the absorbent layer 10 is formed of a nonwoven fabric.

The width of the second fibrous layer 22 is substantially constant over the entire length of the sanitary napkin 1. The second fiber layer 22 is mainly formed of hydrophilic fibers and has liquid absorption retention. The width of the second fibrous layer 22 is preferably 70 to 95% of the width of the sanitary napkin 1, and particularly preferably 80 to 90%. When the width of the sanitary napkin 1 is not fixed in the longitudinal direction, the width of the sanitary napkin 1 is its maximum width.

In the central portion in the width direction of the absorbent layer 10, the respective portions between the first fibrous layer 21 and the third fibrous layer 23 and between the third fibrous layer 23 and the second fibrous layer 22 are joined by embossing. A plurality of joints 24, 24, ... are joined. In the joint portion 24, as shown in Fig. 4, the first fiber layer 21, the second fiber layer 22, and the third fiber layer 23 are joined together to form the absorbent layer 10 as an integral fiber layer.

Further, in the both end portions in the width direction of the absorbent layer 10, the first fiber layer 21 and the third fiber layer 23 are also partially joined by a plurality of joint portions 24, 24, which are embossed.

The absorbent layer 10 and the back thin layer 3 are joined to the entire peripheral portion by a well-known joining method such as adhesion or heat sealing of an adhesive.

In the absorbent layer 10 of the present embodiment, the third fibrous layer 23 has stretchability in the longitudinal direction of the sanitary napkin 1, and also has stretchability in the width direction.

In the absorbent layer 10, the first fibrous layer 21 and the second fibrous layer 22 are partially joined to the third fibrous layer 23 as described above, so that the entire absorbent layer 10 is respectively in the longitudinal direction and the width direction of the sanitary napkin 1. Flexible.

Further, the back sheet 3 of the present embodiment has stretchability in the longitudinal direction of the sanitary napkin 1, and also has stretchability in the width direction.

The sanitary napkin 1 of the present embodiment is formed of the absorbent layer 10 and the back sheet 3 which are stretchable in the longitudinal direction and the width direction. Therefore, the entire sanitary napkin 1 is also stretchable in the longitudinal direction and the width direction. .

Since the sanitary napkin 1 has such a stretchability, it can be three-dimensionally attached to the three-dimensional curved surface of the wearer's body when worn, and can softly follow the movement of the wearer's body, thereby maintaining the adhesion to the wearer's skin.

The sanitary napkin 1 is attached to the inner side of the crotch of a pair of underpants (hereinafter, also referred to as shorts). In general, the sanitary napkin worn on the undergarments such as shorts must follow the movement of the user and stretch in the same manner as the fabric of the underpants.

In view of exhibiting sufficiently high stretchability, the sanitary napkin 1 of the present embodiment preferably has an elongation recovery ratio of 40% or more when it is elongated by 30% in the longitudinal direction and the width direction, and more preferably More than 50%, further better is more than 65%. The elongation recovery ratio may be different between the portion in which the second fiber layer 22 is disposed and the portion where the second fiber layer 22 is disposed in the longitudinal direction and the width direction of the absorbent layer 10. However, the value of the elongation recovery ratio measured is as described above. Within the scope, it shows sufficient flexibility.

The above elongation recovery ratio is measured, for example, by the following method. The tensile compression tester TENSILON "RTA-100" manufactured by ORIENTEC Co., Ltd. was used in the tensile mode. First, the sanitary napkin 1 was cut to have a total length × 50 mm in the width direction, and a measuring piece was taken. When the elongation recovery rate of the sanitary napkin 1 in the longitudinal direction is measured, the orientation between the pneumatic clamps is made to match the longitudinal direction of the sanitary napkin 1 of the measurement piece between the pneumatic clamps mounted on the tensile compression tester, and the measurement piece is placed. The jig attached to the load cell of the tensile compression tester (rated output of 5 kg) was raised at a speed of 100 mm/min, and the measurement piece was stretched. When the measurement piece is placed between the pneumatic clamps, the upper and lower pneumatic clamps are held at both ends in the longitudinal direction of the measurement piece by 5 mm, so that the distance between the pneumatic clamps (initial sample length) becomes the total length of the measurement piece (sanitary cotton 1) Full length) minus 10 mm length.

Then, at the time when the length of the sample at the initial stage of the sheet elongation is 30%, that is, for example, when the distance between the pneumatic grippers (initial sample length) is 200 mm (the length of the sanitary napkin is 210 mm), the time is 60 mm. The direction of movement of the jig is reversed, causing the jig to descend at a speed of 100 mm/min and return to the position of the initial sample length. The relationship between the load detected by the load cell and the elongation of the measurement piece by the operation therebetween was recorded in a graph, and the elongation recovery ratio (%) was obtained from the following equation.

Elongation recovery rate = recovery elongation return / maximum elongation length (in the above example = 60 mm) × 100

Here, the return elongation return is defined as the distance at which the clamp is lowered from the maximum elongation length (=60 mm), and the distance of the clamp from the maximum elongation length when the load is first zero. That is, corresponding to (maximum elongation length) - (sanitary cotton elongation), the more stretched and permanently elongated, unable to recover the sample, the smaller the value, if the elongation is maintained, the sample is stretched. The return elongation is 0. In the case of a stretchable sample that can be restored to the original length of the sanitary napkin, the return elongation is (as the sanitary cotton elongation is 0) equal to the maximum elongation length. Therefore, the elongation recovery ratio varies from 0 to 100 (%), and the larger the value, the more stretchable. Further, the elongation recovery rate of the sanitary napkin 1 in the width direction was measured so that the longitudinal direction of the measurement piece was 50 mm, and the width direction was as large as possible of the entire width of the sanitary napkin. degree. The orientation between the pneumatic jigs was made to coincide with the width direction of the sanitary napkin 1 of the measurement piece, and the same was true.

Further, when the sample is taken without any particular obstacle, it is cut out and cut out in the center including the tampon. When the sealing portion of the outer circumference is hard and weak, and there are some obstacles in the sampling, the length (when measured in the longitudinal direction) can be appropriately adjusted, and (when measured in the width direction) Width).

Further, in the case where the sanitary napkin of "wrinkle" is provided on the side surface in the longitudinal direction, in order to accurately measure the essential stretchability of the sanitary napkin itself, it is preferable to measure by sampling without containing the wrinkle portion.

In the case of a conventional sanitary napkin in which there is almost no elongation in the longitudinal direction or the width direction, it is impossible to extend it by 30%. When the tensile stress of the tensile measuring machine exceeds 2 kg, or when the sanitary napkin is broken by the tensile force below, the measurement is "unable to measure" and the measurement is terminated.

Next, the structure of the absorbent layer 10 which is stretchable in the longitudinal direction and the width direction of the sanitary napkin 1 as described above will be described in detail below.

The absorbing layer 10 is formed in the center portion in the width direction (the portion where the second fiber layer 22 is disposed), as shown in FIGS. 3 and 4, and is composed of the fiber layered body 20, and the fiber layered body 20 is placed on the skin. The first fiber layer 21 on the contact surface side, the second fiber layer 22 disposed on the back surface thin layer 3 side, and the third fiber layer 23 located between the two layers are laminated, and are partially joined by the joint portion 24 of the specific pattern. Adult. The joint portion 24 in the fiber layer laminate 20 is arranged in a so-called zigzag pattern, and each joint portion 24 is formed discontinuously in a plan view. The joint portion 24 is densified, and has a smaller thickness and a larger density than other portions in the fiber layer laminate 20.

The portion of the first fiber layer 21 other than the joint portion 24 is convex on the skin side. In other words, when the fiber layered product 20 is viewed in plan, the portion of the first fiber layer 21 located between the joint portions 24 (specifically, the substantially rectangular portion having the joint portion 24 at the four corner portions) is convex ( In the dome shape, a plurality of convex portions 26a are formed on the surface of the absorbent layer 10 on the skin contact surface side. The inside of each convex portion 26a is filled with fibers constituting the first fiber layer 21, and the interface between the first fiber layer 21 and the third fiber layer 23 between the joint portions is not joined, but is adhered to the entire region. status.

In the second fiber layer 22, a plurality of convex portions 26b are formed on the surface of the back surface layer 3 of the absorbent layer 10, and the structure is the same as that of the first fiber layer 21.

Further, the absorbing layer 10 is composed of a fiber layered product body 20' at both end portions in the width direction thereof, and the fiber layer layered body 20' is formed so that the first fiber layer 21 disposed on the skin contact surface side is disposed on the back side. The third fiber layer 23 on the layer 3 side is laminated, and is partially joined by the joint portion 24 of the specific pattern. Each structure is the same as the central portion in the width direction of the absorbing layer 10.

Then, the fibers constituting the first fiber layer 21, the second fiber layer 22, and the third fiber layer 23 constituting the absorbent layer 10 of the present embodiment will be described in detail. First, as the fibers constituting the first fiber layer 21, Fibers comprising a thermoplastic polymer material are preferably used. Examples of the thermoplastic polymer material include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and polyamine. Further, a core-sheath type composite fiber or a side-by-side type composite fiber comprising a combination of the thermoplastic polymer materials may also be used.

As the fiber constituting the second fiber layer 22, a fiber containing a hydrophilic material having water absorbability can be preferably used. Examples of the water-repellent hydrophilic material include hydrophilic fibers which are originally hydrophilic such as ruthenium or cotton fibers. Further, it is also preferred that the hydrophobic material is hydrophilized to form a hydrophilic fiber. Further, a hydrophilic fiber containing a synthetic resin which is originally hydrophilic is also preferable. The above hydrophilic fibers may be used singly or in combination of plural kinds.

Further, the fibers constituting the first fiber layer 21 and the second fiber layer 22 are not substantially heat-shrinkable, or are not more than the heat shrinkage temperature of the fibers constituting the third fiber layer 23 described later. Heat shrinker.

As the fiber constituting the third fiber layer 23, a heat-shrinkable fiber mainly composed of a thermoplastic polymer material can be preferably used. Further, the fiber can be used to exhibit an elastomeric behavior. As an example of such a fiber, a latent crimpable fiber can be cited. The latent crimped fiber has a fiber which can be treated in the same manner as the previous non-woven fabric before being heated, and which exhibits a spiral crimp by heat at a specific temperature to shrink. By using potentially crimpable fibers, both heat shrinkability and elastomeric behavior can be exhibited simultaneously.

The latent crimpable fiber includes, for example, an eccentric core-sheath type composite fiber or a side-by-side type composite fiber having two thermoplastic polymer materials having different shrinkage ratios as a component. As an example, the one disclosed in the specification of Japanese Patent Laid-Open No. Hei 9-296325 and Japanese Patent No. 2759331 is exemplified.

The fineness of the above-mentioned fibers constituting the respective fiber layers of the absorbent layer 10 is preferably 1.0 to 10 dtex in terms of easiness in fabricating the fiber and exhibiting a good touch as a constituent member of the absorbent article. Good is 1.8~4.0 dtex.

In order to improve the flexibility at the time of wetness, for example, the first fibrous layer 21 and the third fibrous layer 23 may be mixed with water-absorbing fibers such as crepe, cotton, hydrophilized acrylic fibers, pulp, and super absorbent resin fibers. . In the second fiber layer 22, in order to increase the rigidity during wetting, for example, thermoplastic fibers such as heat-shrinkable fibers and superabsorbent fibers may be blended.

Examples of the form of the aggregate of the fibers constituting the first fiber layer 21 include a cotton web formed by a carding method, a non-woven fabric formed by a thermal fusion method, and a non-woven fabric formed by a hydroentangling method. A non-woven fabric formed by a needle punching method, a non-woven fabric formed by a solvent bonding method, a non-woven fabric formed by a spunbonding method, a non-woven fabric formed by a melt blow method, or a woven fabric. In the case where the first fibrous layer 21 is in the form of a cotton web formed by the carding method, a convex portion which is fluffy and filled with fibers constituting the cotton web is formed on the nonwoven fabric, and the fiber is along the Oriented by the way the protrusions. On the other hand, when the first fiber layer 21 is in the form of a nonwoven fabric or a woven fabric, a hollow dome-shaped convex portion is formed. In particular, when the first fiber layer 21 is formed by using a cotton web formed by a carding method, the first fiber layer 21 has an extremely loose structure and can transmit or retain a liquid having a high viscosity. Moreover, the compressive deformation property when the first fiber layer 21 is compressed in the thickness direction is also increased. As the liquid having a high viscosity, a detergent or a menstrual blood, a detergent or a moisturizer for human use, or a detergent used for the object can be cited.

The cotton web formed by the carding method refers to a fiber aggregate in a state before the weaving. In other words, the fiber assembly is in a state in which the cotton web used in the production of the nonwoven fabric is not subjected to treatment, for example, a heat-melting treatment by a hot air method or a calender method, and the fibers are extremely loosely intertwined with each other. When the cotton web formed by the carding method is used for the first fiber layer 21, the first fiber layer 21 is bonded to the other fiber layer or joined, and then the first fiber layer 21 is placed. The fibers are interlaced or mechanically interlaced by means of thermal fusion or solvent bonding.

The form of the aggregate of the fibers constituting the second fiber layer 22 is, for example, a fiber aggregate including hydrophilic fibers having hydrophilicity such as crepe or cotton fibers, and is formed by a carding method. A cotton web, a non-woven fabric formed by a hydroentangling method, a non-woven fabric formed by a needle punching method, or a woven fabric or the like. Further, in the case of a fiber assembly comprising a hydrophilic fiber obtained by hydrophilizing a hydrophobic material or a hydrophilic fiber originally having a hydrophilic synthetic resin, the description is the same as the description of the first fiber layer 21 described above. The form of the fiber assembly. In addition, the description of each nonwoven fabric or the like can be suitably used.

Examples of the form of the aggregate of the fibers constituting the third fiber layer 23 include (1) a cotton web comprising a latent crimpable fiber and formed by a carding method, or (2) a non-woven fabric having heat shrinkability. Examples of the heat-shrinkable nonwoven fabric include a nonwoven fabric formed by a thermal fusion method, a nonwoven fabric formed by a hydroentangling method, a nonwoven fabric formed by a needle punching method, and a solvent bonding method. Non-woven fabric, non-woven fabric formed by a spunbonding method, and non-woven fabric formed by a melt blow method. Here, the non-woven fabric having heat shrinkability means a non-woven fabric having a property of shrinking due to heating at a specific temperature. Further, (3) a cotton web having heat shrinkability can be cited.

In the sanitary napkin 1 of the present embodiment, the second fibrous layer 22 contains the water-absorbent polymer 41 as shown in Figs. 3 and 4, and the absorbability of the absorbent layer 10 can be improved. The basis weight of the water-absorbent polymer dispersed in the second fiber layer 22 is preferably 200 g/m ² or less in terms of ensuring flexibility of the second fiber layer 22 and improving liquid absorption retention. Good is 30~150 g/m ² . The water-absorbent polymer 41 can be in the form of a particle, a powder or a fiber. When the water-absorbent polymer 41 having a particulate or powdery shape is used, the water-absorbent polymer 41 is dispersed and carried in the second fiber layer 22, so that the water-absorbing polymer 41 is as shown in Figs. 3 and 4 It is shown mainly near the surface of the convex portion 26b.

Further, in the case of using a water-absorbent polymer having a fibrous shape, it is preferred to form a fibrous absorbent polymer together with other hydrophilic fibers constituting the fibrous layer when the second fibrous layer 22 is formed. Mix the cotton. Further, it is also preferred that the water-absorbent polymer having a low crosslinking density and hydrated into a gel form is spray-dispersed or gravure-coated on the second fiber layer 22. Further, it is also preferred that the acrylic monomer is polymerized on the surface of the fiber constituting the second fiber layer 22 to form a water-absorptive polymer layer on the surface of the fiber. In such cases, the water-absorbing polymer will be located throughout the convex portion 26b.

As described in the prior art, various methods can be used to form the extensible absorbent body. However, if the prior absorbent body having elongation is directly stretched, the thickness of the absorbent body at the time of elongation becomes thin, resulting in a decrease in absorption performance. The reason for this is that a decrease in the apparent thickness of the absorber causes a decrease in the absorption capacity of the absorber. Therefore, it is necessary to try to make the absorbent body not deteriorate even if it is elongated. That is, it is necessary to try to achieve the following: (A) can be easily elongated, and the structure is not broken even if stretched, and (B) the absorption performance is not lowered after elongation. Therefore, in the present invention, the absorbent layer 10 having extensibility is used as the water absorbing material, and the water absorbing polymer 41 having extremely high liquid absorbing and retaining property is dispersed in the water absorbing material in a large amount. in.

The sanitary napkin 1 of the present embodiment will be further described. The anti-slip material is applied to the non-skin contact surface side of the sanitary napkin 1 and is fixed to the inner surface of the shorts when the sanitary napkin 1 is used. Further, the above-mentioned anti-slip material is protected by covering with a release paper before using the sanitary napkin 1. The non-slip material is preferably adhered to the entire surface of the non-skin contact surface side of the back sheet 3 of the sanitary napkin 1 so as to be reliably adhered to the pants.

The above-mentioned anti-slip material adhesive and the sanitary tissue adhesive can preferably use a styrene-butadiene-styrene, styrene-ethylene-butadiene-styrene adhesive, or the like. Or an elastomer such as a polyolefin-based adhesive, an acrylic-based adhesive, or a silicone-based adhesive, and therefore has an elastic property in nature (without impeding the stretchability of the sanitary napkin). In order to further improve the overall stretchability, the non-slip adhesive may be applied to a pattern in which slits, beads, dots, and the like are spaced apart from each other.

Further, the components constituting the sanitary napkin 1 of the present embodiment will be further described. The thickness of the central portion (the portion where the second fibrous layer 22 is disposed) in the width direction of the absorbent layer 10 is from the viewpoint of stretchability and flexibility. There is no particular limitation. However, in order to integrate with the undergarment, it does not cause discomfort and performance such as fabric-like deformability/drapability, preferably 1.1 to 12 mm, particularly preferably 1.4 to 10 mm. .

The thickness is measured using a measuring device such as a dial gauge thickness gauge or a laser displacement gauge to contain a central portion of the tampon at a load of 2.5 g/cm ² . The value thus measured corresponds to the distance between the convex portions in the thickness direction.

The basis weight of each of the fiber layers constituting the absorbent layer 10 is such that the basis weight of the first fiber layer 21 gives the absorbent layer 10 a sufficient three-dimensional feeling, and the compression deformation property and the flexibility are further improved. It is preferably 10 to 40 g/m ² , particularly preferably 12 to 30 g/m ² . The basis weight of the third fiber layer 23 is preferably the same as that of the case where the basis weight of the first layer 1 is the same, and in addition to ensuring sufficient air permeability, it is preferably 15 to 80 g/m ^{2 .} Especially good is 25~60 g/m ² . The basis weight of the second fiber layer 22 is preferably from 15 to 100 g/m ² , particularly preferably from 25 to 80 g / in terms of imparting sufficient liquid absorption retention to the absorbent layer 10 and ensuring flexibility. m ² . Here, the basis weight of each fiber layer means the basis weight of each fiber layer before joining each fiber layer to form the absorption layer 10.

Further, in the above description, it is assumed that the respective layers are in a form of clear separation. However, there are cases in which the fibers of the respective layers are embedded in each other to form a layer which is inseparable from one another depending on the method of manufacturing or joining the cotton web. For example, each of the following cases and the like is a corresponding example, that is, the heat shrinkage of the third fiber layer 23 is large, and the fiber is inserted into the upper and lower layers due to the strain of the fiber; the heat of the third layer 23 is caused by the water before the shrinkage In the case where the upper and lower layers are integrated, even in the step of forming the web, the fibers of the first layer 21, the third layer 23, and the second layer 22 are sequentially stacked by the airflow (the fibers are mixed into each other). Between layers, the boundary disappears). In these cases, it is difficult to obtain the correct basis weight of each layer, and therefore, the objective is to determine the layer thickness from the basis weight of the whole and the fiber characteristics of the layers observed in the enlarged cross section.

As a material for forming the back surface layer 3, a stretchable resin film or a nonwoven fabric layer is preferable. For example, a urethane resin film or a stretchable polyolefin resin film may be mentioned as the resin film, and a spunbond nonwoven fabric or a melt blown film containing a urethane resin or a stretchable polyolefin resin may be mentioned as the nonwoven fabric layer. Do not weave, or make these composites non-woven.

Specifically, a film such as a film containing a urethane resin and having a basis weight of about 30 g/m ² or a stretchable layer such as a non-woven fabric can be used. Further, as the stretchable polyolefin resin, an ethylene-α-olefin copolymer obtained by polymerizing a metallocene as a catalyst can be used.

Further, as the stretchable film material for the back sheet, it is also preferred to use a polyester resin which is a material having both stretchability and moisture permeability. Among the resins, the supplier "Fleckmer (trade name)" manufactured by Nippon Kasei Co., Ltd. is a representative.

In addition, as the material for forming the back surface layer 3, a stretchable thin layer obtained by forming a film of various elastomers described later can be preferably used. Furthermore, the basis weight and strength of the film can be arbitrarily selected according to the use, and it is not damaged when peeled from the underwear, and is soft and has sufficient stretchability, and the basis weight is about 20 to 60 g/m ² . The flank type is preferably 30~55 g/m ² , and if it is flank-free, it is preferably 25~47 g/m ² .

Further, the leakage preventing layer in the present invention may be an extensible one instead of being stretchable. As the thin layer material which is not stretchable but extensible, a low density polyethylene film or a hydrophobic synthetic fiber spunlace nonwoven fabric or the like can be used.

The water-absorbent polymer 41 is not particularly limited, and various water-absorbent polymer particles used in the conventional absorbent article can be used, and examples thereof include the following polymers. There are sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked body, (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, potassium polyacrylate And polyacrylic acid hydrazine and the like.

The sanitary napkin 1 of the present embodiment is preferably used together with a stretchable shorts. For example, it is preferable that the crotch portion of the shorts to which the sanitary napkin 1 is attached is stretchable in the longitudinal direction and the width direction of the sanitary napkin 1, respectively. The sanitary napkin 1 is used together with the shorts which are stretchable in the longitudinal direction and the width direction, thereby integrating the sanitary napkin 1 and the shorts, and can softly follow the movement of the wearer, and the sanitary napkin 1 and the wearer It is difficult to create a gap between the skin, which can effectively prevent body fluid from leaking out.

Further, in addition to the above-described stretchability, the shorts used together with the sanitary napkin 1 preferably have a convex portion that is raised toward the skin of the user on the inner side of the crotch. When the sanitary napkin 1 of the present embodiment which is soft and stretchable is fixed to the inner side of the crotch of the shorts, the appearance and function thereof are the same as those of the absorbent article having the central high portion, and the absorption of the sanitary napkin 1 can be further improved. And leakproof.

According to the sanitary napkin 1 of the present embodiment, since it has stretchability in the longitudinal direction and the width direction, it is attached to the wearer's skin having a three-dimensional curved surface, and softly follows the wearer's motion without being twisted. With a good sense of wear.

Further, in the absorbent layer 10, a water-absorptive polymer is disposed, and in particular, liquid absorption retention is improved.

Further, by using together with the shorts having the stretchable and convex portions at the lower portion of the crotch as described above, the absorbability and the leakproofness can be further improved.

Next, the sanitary napkin as the absorbent article according to the second and third embodiments will be described with reference to Figs. 5 to 8 . In the second and third embodiments, the first embodiment will be described in detail, as long as it is not particularly described. In FIGS. 5 to 8, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

In the sanitary napkin 1 according to the second preferred embodiment of the present invention, the third fibrous layer 23 in the absorbent layer 10 is further composed of the upper layer 23a on the first fibrous layer 21 side as shown in Figs. 5 and 6 . The lower layer 23b is formed on the second fiber layer 22 side, and the upper layer 23a and the lower layer 23b are partially joined to each other. An important portion of the absorbing layer 10 surrounded by a circle in Fig. 5 is shown enlarged in Fig. 6.

In the absorption layer 10 of the present embodiment, the planar shape of the upper layer 23a is substantially the same as that of the first fiber layer 21, and the planar shape of the lower layer 23b is substantially the same as that of the second fiber layer 22. Similarly to the second fiber layer 22, the lower layer 23b is located at the central portion in the width direction of the absorbing layer 10.

The upper layer 23a and the lower layer 23b are spirally coated with a hot-melt adhesive between the two fiber layers to be bonded.

The upper layer 23a and the lower layer 23b each have elasticity in the longitudinal direction and the width direction of the sanitary napkin 1. For the two fiber layers, the description of the third fiber layer in the first embodiment can be suitably used. Further, other configurations are the same as those of the above embodiment.

The absorbent layer 10 in the sanitary napkin 1 of the present embodiment will be further described, and the absorbent layer 10 is disposed at the central portion in the width direction (the portion where the second fibrous layer 22 and the lower layer 23b are disposed) as shown in Figs. 5 and 6 The fiber layered product 20a is formed by laminating the first fiber layer 21 disposed on the skin contact surface side and the upper layer 23a disposed adjacent to the fiber layer on the back surface layer 3 side. Partially joined by the joint portion 24a of the specific pattern. In addition, the fiber layered product 20b is formed by laminating the second fiber layer 22 disposed on the back surface layer 3 side and adjacent to the fiber layer and disposed on the skin contact surface side lower layer 23b. Partially joined by the joint portion 24b of the specific pattern.

The joint portion 24a of the first fiber layer 21 and the upper layer 23a in the fiber layer laminate 20a is arranged in a so-called zigzag pattern, and each joint portion 24a is formed discontinuously in a circular shape in plan view. The joint portion 24a is densified, and has a smaller thickness and a larger density than other portions in the fiber layer laminate 20a.

Further, the joint portion 24b of the lower layer 23b and the second fiber layer 22 in the fiber laminate body 20b is also formed in the same manner as the joint portion 24a.

The fiber layer laminate 20a and the fiber layer laminate 20b are bonded and integrated as described above. In addition, in FIGS. 5 and 6, the joint portion 24a and the joint portion 24b are disposed at the same position in a plan view, but the joint portion 24a and the joint portion 24b may be disposed at different positions. For example, the joint portion 24a and the joint portion 24b may be formed in different joint patterns.

The portion other than the joint portion 24a of the first fiber layer 21 and the upper layer 23a is convex on the skin side. In other words, when the fiber layered product 20a is viewed in plan, the portion between the joint portions 24a of the first fiber layer 21 (in detail, the substantially rectangular portion having the joint portion 24a at the four corner portions) is convex. (Dome shape), as shown in FIG. 5 and FIG. 6, a plurality of convex portions 26a are formed on the surface of the absorbent layer 10 on the skin contact surface side. The inside of each convex portion 26a is filled with fibers constituting the first fiber layer 21, and the interface between the first fiber layer 21 and the upper layer 23a between the joint portions is not joined, but is made in the entire region. The state of the close connection.

The fiber layered product 20b is also formed in the same manner as the fiber layered product 20a, and the second fiber layer 22 is convex on the side of the back thin layer 3 other than the joined portion 24b of the lower layer 23b, as shown in Figs. 5 and 6 A plurality of convex portions 26b are formed on the non-skin contact surface side of the absorbent layer 10.

Further, the fiber layered body 20b is not disposed at both end portions in the width direction of the absorbent layer 10.

According to the sanitary napkin 1 of the present embodiment described above, the same effects as those of the first embodiment can be obtained. Further, in the central portion in the width direction of the absorbing layer 10, the bonding pattern of the fiber layer laminated body 20a and the bonding pattern of the fiber layer laminated body 20b can be made different. For example, in order to form the sanitary napkin 1 in which the liquid does not remain on the surface, the joint pattern of the fiber layer laminate 20b can be made denser than the fiber layer laminate 20a, thereby increasing the capillary force of the laminate 20b.

Further, in order to further improve the physical properties of the laminated body 20b and the upper layer, it may be physically integrated by embossing or a three-dimensional groove in addition to adhesion by a hot melt adhesive.

In the sanitary napkin 1 according to the third preferred embodiment of the present invention, a liquid as a non-stretchable absorbent layer is disposed between the absorbent layer 10 and the back sheet 3 as shown in Figs. 7 and 8 . A thin layer 42 of retentive polymer is absorbed. Further, in the present embodiment, the second fibrous layer 22 in the absorbent layer 10 does not contain a water-absorptive polymer. There are water-absorbing polymers.

The polymer thin layer 42 has a vertically long rectangular shape in plan view, and its longitudinal direction coincides with the longitudinal direction of the sanitary napkin 1. The polymer thin layer 42 is coated on the surface of the skin abutting surface by a spiral spray coating of the hot melt adhesive to adhere to the absorbent layer 10. Other configurations are the same as those of the first embodiment described above.

The sanitary napkin 1 of the present embodiment will be further described. As shown in Fig. 7, the sanitary napkin 1 is divided into a front portion A in the longitudinal direction and an excretory portion opposite portion B in the longitudinal direction central region (in the center in the width direction). The polymer thin layer 42 is disposed in the excretion portion opposing portion B when the portion of the excretion portion facing the region is disposed opposite to the liquid excretion portion of the wearer and the rear portion C. It is particularly preferable that the polymer thin layer 42 is disposed at the central portion in the width direction of the discharge opposing portion B.

The polymer thin layer 42 has a vertically long rectangular shape in plan view, and its longitudinal direction coincides with the longitudinal direction of the sanitary napkin 1. The polymer thin layer 42 may be non-stretchable if its size is such a size that it does not impede the overall stretchability of the sanitary napkin 1.

The ratio of the size of the polymer thin layer 42 to the size of the sanitary napkin 1 is 60% or less, more preferably 20 to 50%, and the width is 50% or less, and more preferably 10 to 40%. Even if the polymer thin layer 42 is non-stretchable, it does not interfere with the stretchability of the sanitary napkin 1, and therefore it is preferable. Further, when the polymer thin layer 42 is viewed in a plan view, the ratio of the area to the sanitary napkin 1 is preferably from 6 to 30%, particularly preferably in terms of the same reason and ensuring liquid absorbability retention. 10~27%.

The polymer thin layer 42 can be used to form a thin layer of a thin layer or the like for mixing the absorbent polymer with the staple fiber pulp and the fiber. As the dispersion state of the absorbent polymer, any one in which the absorbent polymer is dispersed into a layer and dispersed in a three-dimensional shape can be used. As the above-mentioned absorbent polymer, it is preferred to use the same as those described in the above embodiment.

Further, the fibers used in the polymer thin layer 42 are not particularly limited, and various types of absorbent layers of the prior absorbent articles such as cellulose fibers, regenerated cellulose fibers, hydrophilic synthetic fibers, and composite fibers can be used. fiber.

Further, the cross-sectional form of the polymer thin layer 42 may be in the form of a thin layer as shown in the drawing, and it is also possible to use a F-folded form or a laminated multi-layer.

According to the sanitary napkin 1 of the present embodiment described above, the polymer thin layer is disposed in the opposing portion B of the excretory portion, and the liquid absorption and retention can be improved. Further, as described in the first embodiment, it is not necessary to include the water-absorptive polymer in the absorbent layer 10, so that the production thereof is simplified. Further, the same effects as those of the first embodiment described above can be exerted.

Further, in the present embodiment, the absorbent layer 10 does not contain the water-absorbing polymer, and the polymer thin layer 42 is disposed in the excretion portion opposing portion B. However, the absorbent layer 10 may be provided (in the first embodiment) The same) contains a water-absorbing polymer, and the pulp laminate is disposed in the same size and shape instead of the polymer thin layer 42. The water-absorbent polymer may or may not be disposed in the pulp laminate.

In other words, in the central portion of the sanitary napkin 1 when viewed from above, the non-expandable body or paper may be disposed in the opposing portion B of the excretory portion within a range that does not impair the overall stretchability of the sanitary napkin 1. In this case, in the absorbent layer 10, the water-absorbent polymer may be appropriately added depending on the absorption capacity of the central portion.

Next, an outline of an important part of the above-described preferred method for producing an absorbent article of the present invention will be described.

As a preferred production method for producing the sanitary napkin of the first embodiment, for example, the following method can be mentioned.

First, as shown in FIG. 9, a fiber layer composite 5 is produced by forming a long strip-shaped third fiber layer 23A containing a fiber aggregate mainly comprising a thermoplastic polymer material and having heat shrinkability, and further The fiber of the elastic body is displayed; the first fiber layer 21A having a long strip shape is superposed under the third fiber layer 23A, and the first fiber layer 21A and the third fiber layer 23A have the same width, but the third The fiber layer 23A is formed separately from each other and includes a fiber assembly mainly comprising a thermoplastic polymer material and substantially not thermally shrinking or below the heat shrinkage temperature of the fibers constituting the third fiber layer 23A. Further, the fiber is not heat-shrinked; further, the long second fiber layer 22A is overlapped in the central portion in the width direction of the third fiber layer 23A, and the second fiber layer 22A is narrower than the third fiber layer 23A and the first fiber layer. 21A, and comprising a fiber assembly mainly comprising a fiber composed of a hydrophilic fiber and not substantially thermally contracted or not thermally shrinkable at a temperature lower than a heat shrinkage temperature of the fiber constituting the third fiber layer 23A. In particular, as the first fiber layer 21A and the second fiber layer 22A, it is preferable to use a cotton web formed by fiber opening by a card opening machine.

The first fiber layer 21A, the third fiber layer 23A, and the second fiber layer 22A in the fiber layer composite 5 thus obtained are partially joined by a plurality of joint portions 24 in a specific pattern. As the bonding method, specifically, various bonding methods such as hot embossing, ultrasonic embossing, and adhesion using an adhesive are preferable. The planar shape of each joint portion is preferably a circle, an ellipse, a triangle, or a rectangle, or a combination thereof. Further, examples of the specific pattern of the joint portion include a sawtooth grid pattern or a rhombic grid pattern.

Then, the fiber layer composite 5 produced as described above is placed on the upper side of the second fiber layer 22A, and the first heat treatment is performed at a temperature higher than the temperature at which the fibers constituting the third fiber layer 23A start to thermally shrink. The third fiber layer 23A is contracted, and the first fiber layer 21A and the second fiber layer 22A located in the region enclosed by the joint portion 24 are respectively protruded into a convex shape to form a three-dimensional shape. In the first heat treatment, the heat shrinkage ratio of the third fiber layer 23A is preferably 20 to 70 from the viewpoint of reliably supporting the water-absorbing polymer described later in the second fiber layer 22A. %, especially good is 30~60%. The heat shrinkage ratio is the area shrinkage ratio, which is obtained by the following formula from the reference area S1 before shrinkage and the area S2 after shrinkage of the reference area.

Shrinkage = (S1-S2) / S1 × 100

In order to shrink the third fiber layer 23A, for example, a table type constant temperature dryer or a hot air heat treatment machine used for manufacturing a heat-bonding nonwoven fabric or the like is used.

To the fiber layer composite 5 having the first heat treatment as described above, the water-absorbent polymer 41 is dispersed from the second fiber layer 22A by the width of the second fiber layer 22A to have a uniform basis weight. In the second fiber layer 22A, the first heat shrinkage of the third fiber layer 23A forms a relaxed convex portion in a specific pattern, and the fibers of the second fiber layer are microscopically arranged in a three-dimensional shape and fiber. When the gap is widened, the water-absorbing polymer easily enters the fibers constituting the convex portion.

Then, the fiber layer composite 5 in which the water-absorptive polymer is dispersed as described above is subjected to the second heat treatment in which the fibers constituting the third fiber layer 23A start to be thermally contracted and the temperature is lower than the melting point of the water-absorbing polymer. The third fiber layer 23A is contracted, and the first fiber layer 21A and the second fiber layer 22A located in the region enclosed by the joint portion 24 are further protruded into a convex shape to complete a three-dimensional shape, thereby producing an absorbent layer continuous body. 10A.

At this time, the heat shrinkage rate of the third fiber layer 23A is controlled by heat shrinkage, the elongation recovery property of the absorbent layer 10A, the bulkiness with the formation of the convex portion, and the water-absorbent polymer 41 entering the second fiber layer 22A. In view of the above, it is preferable that the reference area S1 before shrinkage is 30 to 85%, particularly preferably 35 to 70%. The heat shrinkage rate is obtained in the same manner as the above.

By the second heat treatment, the dispersed water-absorptive polymer enters the convex portions 26b of the second fiber layer 22A and is held between the fibers constituting the convex portion 26b.

On the other hand, a spiral spray coating of a hot-melt adhesive is applied to a single surface of a long-length back sheet continuous body 3A which is separately formed of a resin film having stretchability in the longitudinal direction and the width direction. The sheet is faced to the second fiber layer 22A of the absorbent layer continuous body 10A, and the back sheet continuous layer 3A and the absorbent layer continuous body 10A are bonded to each other to form the absorbent article continuous body 1A.

Then, the thus obtained absorbent article continuum 1A is heat-sealed at a specific interval and at a specific width. While performing the heat sealing, the edges of both sides in the longitudinal direction of the absorbent article continuous body 1A are heat-sealed across the heat seal.

Then, the absorbent article continuous body 1A is cut at a portion that is heat-sealed across the width direction of the absorbent article continuous body 1A to obtain a plurality of physiological hygienes as the first embodiment of the absorbent article of the present invention. cotton. In the cutting, it is preferred to circularly cut both end portions in the longitudinal direction of the absorbent article in a curved manner.

Further, in the case where the third fiber layer 23A exhibits an elastic behavior in advance (that is, from the time of joining with the other layers), other preferred manufacturing methods described below can be used.

When the third fiber layer 23A is stretched, the third fiber layer 23A, the first fiber layer 21, and the second fiber layer 22 are joined by the joint portion of the specific pattern. When the stretched state of the third fiber layer 23A is released, the first fiber layer 21 and the second fiber layer 22 located between the joint portions protrude into a convex shape and are shaped into a three-dimensional shape. Others are the same as the above-described method for producing sanitary napkins.

In the case where the third fiber layer 23A exhibits an elastic behavior in advance, a case where the fiber layer is subjected to heat treatment to form a nonwoven fabric may be mentioned.

Further, as the third fiber layer 23A, a fiber assembly including an elastomer fiber, an elastomer film, and an elastomer web may be used. When such a material is used as the third fibrous layer 23A, the sanitary napkin can be produced by using the above-described other preferred manufacturing method. As a material usable as an elastomer, natural rubber, isoprene rubber, butadiene rubber, 1,2-polybutadiene, styrene-butadiene rubber, chloroprene rubber, and nitrile are mentioned. Rubber, butyl rubber, ethylene-propylene rubber, urethane rubber, silicone rubber, and various rubbers known as thermoplastic elastomers, such as urethane, styrene, ester, olefin The guanamine is a rubber having a hard segment or an ethylene-α-olefin copolymer polymerized by using a metallocene as a catalyst.

Moreover, as a preferable manufacturing method of the sanitary napkin of the second embodiment, for example, the following method can be mentioned.

In the method for producing a sanitary napkin according to the first embodiment, the first fibrous layer 21A and the second fibrous layer 22A are placed on top of one of the third fibrous layers 23, but in the present manufacturing method, As shown in FIG. 10, by using the two third fiber layers 23A and 23B, the first fiber layer 21A is superposed on one surface of one of the third fiber layers 23A, and the second fiber layer 22A is superposed on one surface of the other third fiber layer 23B. Two fiber layer composites 5A and 5B are produced, and the two fiber layer composites 5A and 5B are subjected to partial joining and heat treatment in the same manner as in the method for producing the sanitary napkin of the first embodiment. Further, the width of the elongated third fiber layer 23B is substantially the same as that of the second fiber layer 22A. Further, the dispersion of the water-absorptive polymer is carried out only for the fiber layer composite including one of the second fiber layers 22A. Further, in the fiber layer composite including the other of the first fiber layers 21A, it is preferable to form a convex portion in the first fiber layer 21A by heat treatment once.

Then, the surfaces on the side where the first fiber layer 21A or the second fiber layer 22A are not disposed are opposed to each other, and the two fiber layer composites 5A and 5B are partially joined to form the absorbent layer continuous body 10A. For the bonding, a well-known bonding method such as dot embossing, linear embossing, or adhesion by a hot melt adhesive can be used. Further, only the two fiber layer composites 5A and 5B may be overlapped with each other without being partially joined.

Then, in the same manner as the method for producing the sanitary napkin of the first embodiment, the absorbent layer continuous body 10A thus obtained is heat-sealed and cut, and the sanitary napkin of the second embodiment as the absorbent article of the present invention is obtained. .

Moreover, as a preferable manufacturing method of the sanitary napkin of the third embodiment, for example, the following method can be mentioned.

In the method for producing a sanitary napkin according to the first embodiment, the water-absorbent polymer is dispersed in the second fiber layer 22A. However, in the present production method, the water-absorbent polymer is not dispersed, and therefore, The absorbing layer continuous body 10A is produced in the same manner as the method for producing the sanitary napkin of the first embodiment, except that the convex portion is formed by one heat treatment.

Then, the separately prepared polymer thin layer 42 is spirally spray coated with a hot melt adhesive on one surface thereof so that the single surface faces the second fibrous layer 22A of the absorbing layer continuous body 10A, and is adhered at a specific interval. In the center portion in the width direction of the absorbent layer continuous body 10A, the absorbent article continuous body 1A is bonded to the back sheet continuous body 3A in the same manner as in the method for producing the sanitary napkin of the first embodiment, and then the heat is applied. The sanitary napkin according to the third embodiment of the absorbent article of the present invention is obtained by sealing and cutting. Further, when the absorbent article continuous body 1A is heat-sealed at a specific interval and with a specific width, the adjacent polymer thin layers 42 are applied to each other.

The polymer thin layer 42 can be produced, for example, by the following method.

First, the crosslinked pulp and the fibrous polyvinyl alcohol (3 mass% with respect to the crosslinked pulp) were subjected to wet papermaking and thermally dried to prepare a strip-shaped thin layer material having a basis weight of 40 g/cm ² . Prepare two sheets of the thin layer material, apply a hot melt adhesive to a thin layer of material by a slit coater, and spread the water-absorbing polymer on the basis of a weight of 40 g/cm ^{2 to} overlap another thin sheet. The layer material is a polymer thin layer composite formed by sandwiching an absorbent polymer between two sheets of the thin layer material.

Then, the polymer thin layer composite produced as described above was cut into a product having a length of 90 mm and a width of 90 mm, and the polymer thin layer composite cut by three folds in a width of 30 mm. A thin layer of polymer 42 is obtained.

The absorbent article of the present invention is not limited to the above embodiment or the production method, and may be appropriately modified without departing from the gist of the invention.

For example, in the sanitary napkin 1 according to the second embodiment of the present invention, the upper layer 23a and the lower layer 23b are partially joined to each other and may not be partially joined.

Further, in the sanitary napkin 1 of the third embodiment, the water-absorbent polymer may be disposed in the second fiber layer 22.

The absorbent article of the present invention may be a sanitary napkin, a sanitary pad, a vaginal secretion pad or an incontinence pad.

In the above-described one embodiment, the portions that are omitted from the description and the portions that are only included in one embodiment can be used as appropriate. Further, in the above-described one manufacturing method, a part which is omitted from the description and a part which is only one manufacturing method can be used as appropriate.

1. . . Absorbent article

1A. . . Absorbent article continuum

3. . . Thin layer on the back

3A. . . Back thin layer continuum

5, 5A, 5B. . . Fiber layer composite

10. . . Absorbing layer

10A. . . Absorbing layer continuum

11. . . Leakproof layer

20, 20'. . . Fibrous layer

21, 21A. . . First fiber layer

22, 22A. . . Second fiber layer

23, 23A, 23B. . . Third fiber layer

23a. . . upper layer

23b. . . Lower layer

24, 24a, 24b. . . Joint

26a, 26b. . . Convex

41. . . Water-absorbing polymer

42. . . Thin layer of polymer

A. . . Front part

B. . . Excretory department

C. . . Rear part

Fig. 1 is a plan view showing a first embodiment of a sanitary napkin as an absorbent article of the present invention.

Figure 2 is a cross-sectional view taken along line X-X of Figure 1.

Fig. 3 is a schematic perspective view showing an important part of the absorbing layer in the first embodiment of Fig. 2;

Fig. 4 is an enlarged cross-sectional view showing a Y-Y line cross section of Fig. 3;

Fig. 5 is a cross-sectional view corresponding to Fig. 2 showing a sanitary napkin according to a second embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view showing an essential part of the absorbing layer in the second embodiment of Fig. 5, corresponding to Fig. 4;

Fig. 7 is a plan view showing a sanitary napkin according to a third embodiment of the present invention.

Figure 8 is a cross-sectional view taken along line Z-Z of Figure 7.

Fig. 9 is a schematic view showing an example of a method for producing a sanitary napkin according to the first embodiment.

Fig. 10 is a schematic view showing an important part of an example of a method for producing a sanitary napkin according to a second embodiment.

1. . . Absorbent article

20, 20'. . . Fibrous layer

twenty one. . . First fiber layer

twenty two. . . Second fiber layer

twenty four. . . Joint

Claims (9)

An absorbent article comprising: an absorbent layer and a leakage preventing layer; wherein the absorbent layer is a longitudinally long sanitary napkin; and the absorbent layer is disposed on the side of the leakage preventing layer by the first fibrous layer forming the skin abutting surface. The second fiber layer is formed by laminating a third fiber layer between the two layers, and the third fiber layer is made of a crimped fiber and has stretchability in a longitudinal direction and a width direction of the absorbent article. The first fiber layer is mainly composed of a thermoplastic fiber, the second fiber layer is mainly composed of a hydrophilic fiber, and the first fiber layer and the second fiber layer have dome-shaped convex portions that protrude in opposite directions from each other, and the first a convex portion of the fibrous layer and a convex portion of the second fibrous layer are formed at positions corresponding to the front and back surfaces of the absorbent layer; and between the first fibrous layer and the third fibrous layer, and the third portion The fiber layer and the second fiber layer are partially joined to each other; and when the absorption layer is viewed in plan, the joint portion between the first fiber layer and the third fiber layer is formed in a dot-like pattern, and is located in the above-mentioned 1 fiber a bottom portion of the concave portion formed on the skin contact surface side of the layer; wherein the absorbent layer includes only the water-absorbing polymer in the second fiber layer; and the leakage preventing layer is formed of a back thin layer of an elastic system, and the absorption The layer and the leakage preventing layer are joined to each other at a peripheral portion of the absorption layer; The entire absorbent article has stretchability in the longitudinal direction and the width direction. The absorbent article according to claim 1, wherein the partial joining between the first fibrous layer and the third fibrous layer and between the third fibrous layer and the second fibrous layer is joined by embossing . The absorbent article according to claim 1, wherein the entire absorbent article has an elongation recovery ratio of 40% or more when it is elongated by 30% in its longitudinal direction. The absorbent article of claim 1, wherein the third fibrous layer is mainly composed of heat-shrinkable fibers. The absorbent article of claim 1, wherein the hydrophilic fiber is a tendon or a cotton fiber. The absorbent article of claim 1, wherein a non-stretchable absorbent layer is disposed between the absorbent layer and the leakage preventing layer. The absorbent article according to claim 6, wherein the ratio of the size of the non-stretchable absorbent layer to the size of the absorbent article is 60% or less in length and 50% or less in width. The absorbent article of claim 1, wherein the non-stretchable absorbent layer is not disposed between the absorbent layer and the leakage preventing layer. The absorbent article according to claim 1, wherein the third fibrous layer is further formed by the upper layer on the first fibrous layer side and the lower layer on the second fibrous layer side, and the upper layer and the lower layer portion are joined to each other.