JP4651573B2 - Elastic nonwoven fabric - Google Patents

Description

  The present invention relates to a stretchable nonwoven fabric.

  As a composite stretchable nonwoven fabric having a nonwoven fabric and an elastic fiber layer, one using a fiber layer of short fibers as a surface layer is known (see Patent Document 1). However, when short fibers are used for the surface layer, fluff is likely to occur, and the texture of the stretchable nonwoven fabric tends to decrease. In order to prevent the occurrence of fluff, it is conceivable that the nonwoven fabric and the elastic fiber layer are partially bonded using an adhesive, a heat roll, etc., and then stretchability is expressed by mechanical stretching. In some cases, floating occurs between the layers between the bonded portions, the bonded portions become hard, and the texture of the stretchable nonwoven fabric also decreases.

  In order to increase the bonding strength between the nonwoven fabric and the elastic fiber layer and prevent the occurrence of floating between the layers, the nonwoven fabric and the elastic fiber layer are hydroentangled and then subjected to air-through treatment and then stretched by mechanical stretching. It has been proposed to develop sex (see Patent Document 2). However, in this technique, when the nonwoven fabric and the elastic fiber layer are joined to such an extent that no fuzz is formed, the fibers are firmly tightened in the thickness direction, and the texture of the stretchable nonwoven fabric is lowered. Also, during hydroentanglement, the constituent fibers of the elastic fiber layer come out on the surface of the stretchable nonwoven fabric, and the texture of the stretchable nonwoven fabric is lowered due to the stickiness characteristic of the elastic material. Furthermore, in this technique, the elastic fiber layer is substantially deformed into a non-fibrous structure by heat treatment and becomes a film, so that the breathability of the entire stretchable nonwoven fabric is lowered.

  Patent Document 3 discloses a laminated elastic nonwoven fabric obtained by laminating at least one selected from nonwoven fabrics other than the elastic nonwoven fabric, film, web, woven fabric, knitted fabric, and fiber bundle on an elastic nonwoven fabric in which elastomer long fibers and non-elastomeric fibers are mixed. Has been. Furthermore, it is disclosed that a web obtained by a card method or an air raid method may be laminated on the elastic nonwoven fabric by a water jet method, a point bond method, or a through air method. This elastic nonwoven fabric is intended to suppress blocking when fed from a roll. For this purpose, it has been disclosed that a thin layer web of non-elastomeric fine fibers may be laminated on the elastic nonwoven fabric. However, there is no description about the point that a part of the fine fineness thin layer web enters into the elastic nonwoven fabric and / or the point that a part of the constituent fibers of the elastic nonwoven fabric enters the thinness thin layer web. The elastic nonwoven fabric is not sufficient in that it has good stretchability, good fiber fusion, high maximum strength, no fluff, high air permeability, and a soft and soft texture.

JP-A-52-21479 JP-A-6-294060 JP 2005-89870 A

  Accordingly, an object of the present invention is to provide a stretchable nonwoven fabric that can eliminate the various drawbacks of the above-described prior art.

In the present invention, a substantially inelastic non-elastic fiber layer is disposed on at least one surface of the elastic fiber layer,
Both fiber layers are joined together by thermal fusion of fiber intersections in a state where the constituent fibers of the elastic fiber layer maintain the fiber form,
Provided is a stretchable nonwoven fabric in which a part of the constituent fibers of the non-elastic fiber layer enters the elastic fiber layer and / or a part of the constituent fibers of the elastic fiber layer enters the non-elastic fiber layer. This achieves the object.

  The stretchable nonwoven fabric of the present invention is thick and bulky, has a soft texture, and has sufficient air permeability. Further, since the elastic fiber is not exposed on the surface of the nonwoven fabric, the nonwoven fabric has no stickiness and the texture is also improved. Furthermore, the occurrence of fluffing can be suppressed.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The schematic diagram which shows the cross-section of one Embodiment of the elastic nonwoven fabric of this invention is shown by FIG. The stretchable nonwoven fabric 10 of this embodiment is configured by laminating the same or different substantially inelastic non-elastic fiber layers 2 and 3 on both surfaces of the elastic fiber layer 1.

  The elastic fiber layer 1 and the non-elastic fiber layers 2 and 3 are joined on the entire surface by thermal fusion of fiber intersections in a state where the constituent fibers of the elastic fiber layer 1 maintain the fiber form. That is, the joining state differs from the conventional stretchable nonwoven fabric that is partially joined. In the stretchable nonwoven fabric 10 of the present embodiment in which the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3 are joined together, the interface between the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3 and the vicinity thereof. In FIG. 2, the intersections of the constituent fibers of the elastic fiber layer 1 and the constituent fibers of the non-elastic fiber layers 2 and 3 are heat-sealed, and are bonded substantially uniformly over the entire surface. By being bonded over the entire surface, it is possible to prevent the floating between the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3, that is, the formation of a space by separating both layers. When floating occurs between the two layers, there is no sense of unity between the elastic fiber layer and the non-elastic fiber layer, and the texture of the stretchable nonwoven fabric 10 tends to decrease. According to the present invention, a stretchable nonwoven fabric having a multi-layer structure with a sense of unity, such as a single nonwoven fabric, is provided.

  “The state in which the constituent fibers of the elastic fiber layer 1 maintain the fiber form” means that even if most of the constituent fibers of the elastic fiber layer 1 are given heat, pressure, or the like, a film or film- A state in which the fiber structure is not deformed. Unlike the stretchable nonwoven fabric described in Patent Document 2 described above, the stretchable nonwoven fabric 10 of the present embodiment is provided with sufficient breathability because the constituent fibers of the elastic fiber layer 1 are in a state of maintaining the fiber form. There is an advantage of being. As will be described later, the elastic nonwoven fabric 10 of the present embodiment is subjected to hot embossing to form the joint 4. In the joint 4, the constituent fibers of the elastic fiber layer 1 may have a film shape or a film-fiber structure depending on the heat embossing conditions. Therefore, whether or not “the constituent fibers of the elastic fiber layer 1 maintain the fiber form” is determined by paying attention to a portion other than the joint portion 4.

  In the elastic fiber layer 1, the intersections of the constituent fibers are thermally fused in the layer. Similarly, in the inelastic fiber layers 2 and 3, the intersections of the constituent fibers are heat-sealed in the layers.

  In at least one of the two non-elastic fiber layers 2 and 3, a part of the constituent fibers are in the elastic fiber layer 1, and / or a part of the constituent fibers of the elastic fiber layer is at least one of the two. The inelastic fiber layers 2 and 3 are in a state of entering. By being in such a state, integration of the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3 is promoted, and it is more effectively prevented that floating occurs between both layers. As a result, the layers are combined with each other following the surface of each layer. Part of the constituent fibers of one inelastic fiber layer enters the elastic fiber layer 1 and remains there, or penetrates through the elastic fiber layer 1 and reaches the other inelastic fiber layer. For example, in the non-elastic fiber layers 2 and 3, when a surface connecting the surface fibers on the side facing the elastic fiber layer 1 out of the two surfaces is assumed macroscopically, a fiber space formed from this surface to the inside of the layer In addition, some of the constituent fibers of the elastic fiber layer 1 have entered. Further, when the surfaces connecting the surface fibers are assumed macroscopically on the two surfaces of the elastic fiber layer, the constituent fibers of the non-elastic fiber layers 2 and 3 are formed in fiber spaces formed inside these layers from these surfaces. A part of has entered. In particular, when the constituent fibers of the inelastic fiber layer enter the elastic fiber layer 1 and remain there, it is preferable that the constituent fibers are further entangled with the constituent fibers of the elastic fiber layer 1. Similarly, when the constituent fiber of one inelastic fiber layer penetrates through the elastic fiber layer 1 and reaches the other inelastic fiber layer, the constituent fiber has the configuration of the other inelastic fiber layer. It is preferably entangled with the fibers. This is confirmed by the fact that a space is not substantially formed between the layers when the cross section in the thickness direction of the stretchable nonwoven fabric is observed with an SEM or a microscope. The term “entanglement” as used herein means a state where the fibers are sufficiently intertwined, and a state where the fiber layers are simply overlapped is not included in the confounding. Whether or not they are entangled can be determined, for example, by the following method. From the state in which the fiber layers are simply overlapped, the force required to peel the fiber layers is measured. Separately, after the fiber layers are overlapped and an air-through method without heat fusion is applied thereto, the force for peeling the fiber layers is measured. If two forces are compared and a substantial difference is recognized between the two, it can be determined that they are entangled.

  In order to allow the constituent fibers of the non-elastic fiber layer to enter the elastic fiber layer and / or to allow the constituent fibers of the elastic fiber layer to enter the non-elastic fiber layer, the constituent fibers of the non-elastic fiber layer and the configuration of the elastic fiber layer It is preferable that at least one of the non-elastic fiber and the elastic fiber is in a web state (a state where the fiber is not heat-sealed) before the process of thermally fusing the fiber. From the viewpoint of allowing the constituent fibers to enter other layers, the fiber layer in the web state is preferable because the short fibers have a higher degree of freedom than the long fibers.

  In order to allow the constituent fibers of the inelastic fiber layer to enter the elastic fiber layer 1 and / or to allow the constituent fibers of the elastic fiber layer to enter the inelastic fiber layer, it is preferable to use the air-through method. By using the air-through method, the constituent fibers can be made to enter the opposing fiber layer, and the constituent fibers can be easily made to enter from the opposing fiber layer. In addition, by using the air-through method, it becomes easy to allow the constituent fibers of the inelastic fiber layer to enter the elastic fiber layer 1 while maintaining the bulkiness of the inelastic fiber layer. In the case where the constituent fibers of one inelastic fiber layer are allowed to penetrate the elastic fiber layer 1 and reach the other inelastic fiber layer, it is preferable to use the air-through method similarly. In particular, it is preferable to laminate an inelastic fiber layer in a web state with the elastic fiber layer and use the air-through method. In this case, the constituent fibers of the elastic fiber layer may or may not be heat-sealed. Furthermore, as will be described later in the manufacturing method, by performing the air-through method under specific conditions, and for improving the flow of hot air, the breathability of the stretchable nonwoven fabric, particularly the breathability of the elastic fiber layer is high. By doing, a fiber can be made to penetrate more uniformly. A method other than the air-through method, for example, a method of spraying steam can also be used. It is also possible to use a spunlace method, a needle punch method or the like. In this case, the bulkiness of the inelastic fiber layer is impaired, or constituent fibers of the elastic fiber layer come out on the surface of the nonwoven fabric 10. Therefore, the texture of the resulting stretchable nonwoven fabric tends to decrease.

  In particular, when the constituent fibers of the non-elastic fiber layer are entangled with the constituent fibers of the elastic fiber layer 1, it is preferable that the non-elastic fiber layer is entangled only by the air-through method.

  In order to entangle the fibers by the air-through method, the gas blowing pressure, the blowing speed, the basis weight and thickness of the fiber layer, the conveying speed of the fiber layer, and the like may be appropriately adjusted. By simply adopting the conditions for producing a normal air-through nonwoven fabric, the constituent fibers of the inelastic fiber layer and the constituent fibers of the elastic fiber layer 1 cannot be entangled. As will be described later in the production method, the stretchable nonwoven fabric intended in the present invention is obtained by performing the air-through method under specific conditions.

  In the air-through method, generally, a gas heated to a predetermined temperature is penetrated in the thickness direction of the fiber layer. In that case, fiber entanglement and fiber intersection fusion occur simultaneously. However, in this embodiment, it is not essential to fuse the fiber intersections between the constituent fibers in each layer by the air-through method. In other words, in the air-through method, the constituent fibers of the non-elastic fiber layer are allowed to enter the elastic fiber layer 1 or the constituent fibers are entangled with the constituent fibers of the elastic fiber layer 1 and the non-elastic fiber layer This is an operation necessary for heat-sealing the constituent fibers and the constituent fibers of the elastic fiber layer 1. The direction in which the fibers enter varies depending on the passing direction of the heated gas and the positional relationship between the inelastic fiber layer and the elastic fiber layer. The inelastic fiber layer is preferably an air-through nonwoven fabric in which constituent fibers are fused at fiber intersections by an air-through method.

  As is clear from the above description, in the preferred form of the stretchable nonwoven fabric of the present embodiment, the elastic fiber layer 1 in a state in which the constituent fibers maintain the fiber form inside the substantially inelastic air-through nonwoven fabric in the thickness direction. Is included, and a part of the constituent fibers of the air-through nonwoven fabric enters the elastic fiber layer 1 and / or a part of the constituent fibers of the elastic fiber layer 1 enters the non-elastic fiber layer. ing. In a more preferred form, some of the constituent fibers of the air-through nonwoven fabric are entangled only with the constituent fibers of the elastic fiber layer 1 by the air-through method. Since the elastic fiber layer 1 is included in the air-through nonwoven fabric, the constituent fibers of the elastic fiber layer 1 are not substantially present on the surface of the stretchable nonwoven fabric. This is preferable from the point that the stickiness peculiar to an elastic fiber does not arise.

  The elastic fiber layer 1 has a property that it can be stretched and contracts when released from the stretched force. The elastic fiber layer 1 preferably has a residual strain of 20% or less, particularly 10% or less when contracted after 100% elongation in at least one direction parallel to the surface. This value is preferably satisfied in at least one of the MD direction and the CD direction, and more preferably satisfied in both directions.

  The elastic fiber layer 1 is an aggregate of fibers having elasticity. However, as long as the elastic elasticity of the elastic fiber layer 1 is not impaired, a small amount of inelastic fibers may be contained. The elastic fiber may be a continuous fiber or a short fiber. The elastic fiber forming method includes, for example, a melt blown method in which a molten resin is extruded from a nozzle hole, and the extruded molten resin is elongated by hot air to thin the fiber, and a semi-molten resin is cooled by cold air. There is also a spunbond method in which stretching is performed by a mechanical draw ratio. There is also a spinning blow method which is a kind of melt spinning method.

  The elastic fiber layer 1 can be in the form of a web or a nonwoven fabric made of elastic fibers. For example, it may be a web or a non-woven fabric formed by a spinning blow method, a spun bond method, a melt blow method, or the like. The elastic fiber layer 1 is particularly preferably a web obtained by a spinning blow method.

  In the spinning blown method, a pair of hot air discharge portions are disposed opposite to each other around the nozzle, and a pair of cold air discharge portions are disposed opposite to each other downstream from the nozzle. Use a spinning die. According to the spinning blow method, the stretch of the molten fiber by hot air and the cold stretch by cold air are continuously performed, so that there is an advantage that the stretchable fiber can be easily formed. Further, since the fibers do not become too dense and elastic fibers having a thickness similar to short fibers can be formed, there is an advantage that a nonwoven fabric with high air permeability can be obtained. Further, according to the spinning blow method, a continuous filament web can be obtained. The continuous filament web is extremely advantageous in the present embodiment because it is less likely to break at the time of high elongation than the short fiber web and easily develops elasticity.

  Examples of the spinning die used in the spinning blow method include those described in FIG. 1 of JP-B 43-30017, those shown in FIG. 2 of JP-A 62-90361, The thing described in FIG. 2 of 174008 gazette can be used. Furthermore, what is shown by FIG. 2 of Unexamined-Japanese-Patent No. 3-174008, and what is shown by FIG. 1 thru | or FIG. 3 of patent 3335949 can be used. The fibers spun from the spinning die are deposited on a collection net conveyor.

  As a constituent fiber of the elastic fiber layer 1, for example, a fiber made from a thermoplastic elastomer or rubber can be used. In particular, fibers made from thermoplastic elastomers can be melt-spun using an extruder in the same way as ordinary thermoplastic resins, and the fibers thus obtained are easily heat-sealed. Is suitable for the stretchable nonwoven fabric of this embodiment. Examples of the thermoplastic elastomer include styrene elastomers such as SBS, SIS, SEBS, and SEPS, olefin elastomers, polyester elastomers, and polyurethane elastomers. These can be used individually by 1 type or in combination of 2 or more types. A core-sheath type or side-by-side type composite fiber made of these resins can also be used. In particular, use of a styrene-based elastomer, an olefin-based elastomer, or a combination thereof is preferable in terms of moldability, elastic properties, and cost of elastic fibers.

  Inelastic fiber layers 2 and 3 have extensibility, but are substantially inelastic. The stretchability here refers to the case where the constituent fibers themselves are stretched, and even if the constituent fibers themselves are not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are thermally fused. The three-dimensional structure formed by a plurality of fibers may be structurally changed due to wearing or the like, and the constituent fibers may be broken, and the whole fiber layer may be elongated.

  Examples of the fibers constituting the inelastic fiber layers 2 and 3 include fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, and the like. The fibers constituting the inelastic fiber layers 2 and 3 may be short fibers or long fibers, and may be hydrophilic or water repellent. Further, core-sheath type or side-by-side composite fibers, split fibers, irregularly shaped cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used. These fibers can be used singly or in combination of two or more. The inelastic fiber layers 2, 3 can be continuous filaments or short fiber webs or nonwovens. In particular, a short fiber web is preferable from the viewpoint of forming thick and bulky inelastic fiber layers 2 and 3. The two inelastic fiber layers 2 and 3 may be the same or different with respect to the material, basis weight, thickness, and the like of the constituent fibers. In the case of a core-sheath type composite fiber, the core is preferably PET or PP, and the sheath is preferably a low melting point PET, PP or PE. In particular, these composite fibers are preferable in that heat fusion with the constituent fibers of the elastic fiber layer preferably including styrene-based elastomer, olefin-based elastomer and the like becomes strong and layer peeling hardly occurs.

  At least one of the two non-elastic fiber layers 2 and 3 is preferably 1.2 to 20 times, particularly 1.5 to 5 times as thick as the elastic fiber layer 1. On the other hand, regarding the basis weight, it is preferable that the basis weight of the elastic fiber layer is higher than the basis weight of at least one of the two inelastic fiber layers 2 and 3. In other words, the non-elastic fiber layer is preferably thicker and has a smaller basis weight than the elastic fiber layer. By having such a relationship between the thickness and the basis weight, the inelastic fiber layer becomes thicker and bulkier than the elastic fiber layer. As a result, the stretchable nonwoven fabric 10 is soft and has a good texture.

  Regarding the thickness of the non-elastic fiber layers 2 and 3, it is preferably 0.05 to 5 mm, particularly preferably 0.1 to 1 mm. On the other hand, the thickness of the elastic fiber layer 1 is preferably smaller than the thickness of the non-elastic fiber layers 2 and 3, specifically 0.01 to 2 mm, particularly 0.1 to 0.5 mm. preferable. The thickness can be measured by observing a cross section of the stretchable nonwoven fabric with a microscope at a magnification of 50 to 200 times, obtaining an average thickness in each visual field, and obtaining an average value of the thicknesses of three visual fields.

For the basis weight itself of the non-elastic fibrous layers 2 and 3, from the viewpoints of and residual strain which covers the surface of the elastic fiber layer uniform, respectively 1~60g / m ^2, to be particularly 5 to 15 g / m ² preferable. On the other hand, the basis weight itself of the elastic fiber layer 1 is preferably larger than the basis weight of the non-elastic fiber layers 2 and 3 from the viewpoint of stretch characteristics and residual strain. It is preferred particularly 5 to 80 g / m ^2, in particular 20 to 40 g / m ^2.

  Regarding the fiber diameter of the constituent fibers, the fiber diameter of the constituent fibers of the elastic fiber layer 1 is 1.2 to 5 times the fiber diameter of the constituent fibers of at least one of the non-elastic fiber layers 2 and 3, particularly 1.2 to 2.. It is preferably 5 times. In addition to this, the constituent fiber of the elastic fiber layer 1 has a fiber diameter of 5 μm or more, particularly 10 μm or more, preferably 100 μm or less, particularly 40 μm or less, from the viewpoint of air permeability and stretchability. On the other hand, the constituent fibers of the inelastic fiber layers 2 and 3 preferably have a fiber diameter of 1 to 30 μm, particularly 10 to 20 μm. That is, as the constituent fibers of the non-elastic fiber layers 2 and 3, it is preferable to use those that are thinner than the constituent fibers of the elastic fiber layer 1. Thereby, the fusion point of the constituent fibers of the non-elastic fiber layers 2 and 3 located on the surface layer of the nonwoven fabric 10 is increased. The increase in the fusion point is effective in preventing the occurrence of fuzz in the stretchable nonwoven fabric 10. Furthermore, the stretchable nonwoven fabric 10 having a good touch can be obtained by using thin fibers.

  In the stretchable nonwoven fabric 10 of this embodiment, as shown in FIG. 1, minute recesses are formed in the inelastic fiber layers 2 and 3. Thereby, the cross section of the stretchable nonwoven fabric 10 has a waveform shape microscopically. This waveform shape is generated by stretching 10 stretchable nonwoven fabrics, as will be described later in the manufacturing method. This corrugated shape is produced as a result of imparting stretchability to the stretchable nonwoven fabric 10 and does not have a significant adverse effect on the texture of the nonwoven fabric 10 itself. Rather, it is advantageous in that a softer and better nonwoven fabric can be obtained.

  Although not shown in FIG. 1, the stretchable nonwoven fabric 10 of the present embodiment may be embossed. Embossing is performed for the purpose of further increasing the bonding strength between the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3. Therefore, if the elastic fiber layer 1 and the non-elastic fiber layers 2 and 3 can be sufficiently joined by the air-through method, it is not necessary to perform embossing. In the embossing, the constituent fibers are joined to each other. However, unlike the air-through method, the constituent fibers are not entangled depending on the embossing.

  The stretchable nonwoven fabric 10 of this embodiment has stretchability in at least one direction in the in-plane direction. It may have elasticity in all directions in the plane. In that case, it is not hindered that the degree of elasticity varies depending on the direction. With respect to the direction of expansion and contraction, the degree of elasticity is preferably 20 to 500 cN / 25 mm, particularly 40 to 150 cN / 25 mm, at 100% elongation. Further, the residual strain when contracted from the 100% stretched state is preferably 15% or less, particularly preferably 10% or less.

The stretchable nonwoven fabric 10 of this embodiment can be used for various uses such as surgical clothes and cleaning sheets from the viewpoint of its good texture, fuzz prevention, stretchability, and breathability. In particular, it is preferably used as a constituent material of absorbent articles such as sanitary napkins and disposable diapers. For example, it can be used as a sheet for providing elastic stretchability to a sheet constituting the outer surface of a disposable diaper, a waistline part, a waist part, a leg periphery part, or the like. Moreover, it can be used as a sheet or the like for forming a stretchable wing of a napkin. Moreover, even if it is another site | part, it can be used for the site | part etc. which want to provide a stretching property. The basis weight and thickness of the stretchable nonwoven fabric can be appropriately adjusted according to the specific application. For example, when used as a constituent material of an absorbent article, it is desirable that the basis weight is about ²⁰ to 160 g / m ² and the thickness is about 0.1 to 5 mm. In addition, the stretchable nonwoven fabric of the present invention is flexible and has high air permeability because the constituent fibers of the elastic fiber layer maintain the fiber form. Regarding the bending stiffness which is a measure of flexibility, the stretchable nonwoven fabric of the present invention preferably has a bending stiffness value as low as 10 g / 30 mm or less. Regarding the air permeability, the air permeability is preferably 16 m / (kPa · s) or more. The elongation is preferably 100% or more.

  The bending stiffness is measured in accordance with JIS L-1096, and is obtained as an average value when bent in the flow direction and in a direction perpendicular to the flow direction, respectively, under the conditions of an indentation amount of 8 mm by a handle ohmmeter and a slit width of 10 mm. The air permeability is obtained as the reciprocal of the airflow resistance measured by AUTOMATIC AIR-PERMEABILITY TESTER KES-F8-AP1 manufactured by Kato Tech.

  Next, the preferable manufacturing method of the elastic nonwoven fabric 10 of this embodiment is demonstrated, referring FIG. First, an inelastic fiber web 3 ′ is manufactured by the card machine 21 using inelastic short fibers as a raw material, and is continuously conveyed in one direction. Fibers spun by a spinning blown spinning die 22 using an elastic resin as a raw material are deposited on a collection net conveyor to produce an elastic fiber web 1 'containing continuous filaments of elastic fibers. This is peeled off from the conveyor and laminated on the inelastic fiber web 3 ′ formed by the card machine 21 and continuously conveyed in one direction. On the elastic fiber web 1 ′, an inelastic fiber web 2 ′ manufactured by the card machine 23 is further laminated.

  In addition, after the non-elastic fiber web 3 'is temporarily fused by heat treatment or after temporary entanglement, elastic fibers spun directly on the non-elastic fiber web 3' are preferably directly deposited. By doing in this way, the freedom degree of an elastic fiber becomes high and it becomes easy to mutually enter a mutual fiber with a wind etc., and it is preferable. Examples of temporary fusing by heat treatment include a heat roll method, a pressure calender roll method, a steam method, and an air-through method, and examples of temporary confounding include a needle punch method and a water jet method. In particular, use of a heat roll and an air-through method is preferable in that the texture of the nonwoven fabric is not impaired and the facility space can be reduced. The non-elastic fiber web 3 'is preferably not wound after the temporary fusion or temporary entanglement, and the elastic fibers are preferably directly deposited on the non-elastic fiber web 3' in-line. Once wound up, the inelastic fiber web 3 'may be crushed by the winding pressure. The purpose of provisional fusion and provisional entanglement is to prevent the web from being blown away by wind or the like when the elastic fibers are directly melt spun and deposited on the web.

  The laminate of the three webs is sent to an air-through dryer 24 where hot air treatment is performed. By the hot air treatment, a part of the constituent fibers of the non-elastic fiber web 2 ′ located mainly on the hot air blowing surface side enters the elastic fiber web 1 ′. Depending on the conditions of the hot air treatment, a part of the constituent fibers of the non-elastic fiber web 2 ′ enters the elastic fiber web 1 ′ and further entangles with the constituent fibers of the web 1 ′. Alternatively, a part of the constituent fibers of the non-elastic fiber web 2 ′ penetrates the elastic fiber web 1 ′ to reach the non-elastic fiber web 3 ′ and entangle with the constituent fibers of the web 3 ′.

A part of the constituent fibers of the non-elastic fiber web 2 'is allowed to enter the elastic fiber web 1' and / or a part of the constituent fibers of the elastic fiber web 1 'is allowed to enter the non-elastic fiber web 2'. The conditions are preferably a hot air flow rate of 0.4 to 3 m / second, a temperature of 80 to 160 ° C., a conveyance speed of 5 to 200 m / minute, and a heat treatment time of 0.5 to 10 seconds. In particular, it is preferably higher than the amount of hot air generally used as the air-through method, and particularly preferably the amount of hot air is 1 to 2 m / sec. If a high air permeability net is used for the air-through heat treatment, the fibers are more likely to enter through the air. Similarly, when the elastic fiber web 1 ′ is directly spun on the non-elastic fiber web 3 ′, the constituent fibers of the elastic fiber web 1 ′ easily enter the non-elastic fiber web 3 ′ due to wind during spinning. The net used for the hot air treatment and the net used for the direct spinning of the elastic fiber have an air permeability of 250 to 800 cm ³ / (cm ² · s), particularly 400 to 750 cm ³ / (cm ² · s). preferable. The above conditions are also preferable in terms of softening the fibers and allowing them to penetrate uniformly and fusing the fibers. Furthermore, in order to entangle the fiber, it becomes possible by setting the hot air flow rate to 3 to 5 m / second and the blowing pressure to 0.1 to 0.3 kPa. It is preferable that the air permeability of the elastic fiber web 1 ′ is 8 m / (kPa · s) or more, particularly 24 m / (kPa · s) or more, because the hot air can flow better and the fibers can enter more uniformly. . Further, the fiber fusion is good and the maximum strength is high. In addition, fuzz is prevented.

  In the hot air treatment, a part of the constituent fibers of the non-elastic fiber web 2 ′ enters the elastic fiber web 1 ′ and at the same time, the constituent fibers of the non-elastic fiber web 2 ′ and / or the configuration of the non-elastic fiber web 3 ′. The fibers and the constituent fibers of the elastic fiber web 1 'are heat-sealed at their intersections. In this case, care should be taken so that the constituent fibers of the elastic fiber web 1 ′ do not form a film or film-fiber structure by the hot air treatment. In the hot air treatment, the constituent fibers of the inelastic fiber web 2 ′ are heat-sealed at the intersection, and similarly, the constituent fibers of the elastic fiber web 1 ′ and the constituent fibers of the inelastic fiber web 3 ′ are intersected. Heat fusion.

  The fiber sheet 10B in which the three webs are integrated is obtained by the hot air treatment of the air-through method. The fiber sheet 10B is sent to an embossing device 25 including an embossing roll 26 in which embossing convex portions are regularly arranged on a peripheral surface and a receiving roll 27 arranged to face the embossing roll 26, and is subjected to heat embossing there. As shown in FIG. 3 and FIGS. 4A and 4C, the fiber sheet 10A in which the joint portions 4 are formed in a regular pattern is obtained by hot embossing. For example, as shown in FIGS. 3 and 4, the joint 4 is preferably formed discontinuously in both the flow direction (MD) and the orthogonal direction (CD) of the fiber sheet 10 </ b> A.

  Next, the fiber sheet 10A having a three-layer structure is stretched. Specifically, as shown in FIGS. 2 and 4, the fiber sheet 10 </ b> A is a pair of concave and convex rolls in which large diameter portions 31 and 32 and small diameter portions (not shown) are alternately formed in the axial direction. The fiber sheet 10 </ b> A is stretched in a direction (CD) orthogonal to the flow direction (MD) using the stretching device 30 including 33 and 34.

  The stretching device 30 has a known lifting mechanism (not shown) that vertically displaces the pivotal support portions of one or both of the concave and convex rolls 33 and 34, and the interval between the rolls 33 and 34 can be adjusted. In this manufacturing method, as shown in FIG. 2 and FIGS. 4 (b) and 4 (d), the large-diameter portion 31 of one concave-convex roll 33 is connected to the other concave-convex roll 34. Combined so that the large diameter portion 32 of the other uneven roll 34 is loosely inserted between the large diameter portions 32 and the large diameter portion 31 of the one uneven roll 33 is inserted between the rolls 33 and 34 in that state. Then, the fiber sheet 10A is inserted, and the fiber sheet 10A is stretched.

In this stretching step, as shown in FIGS. 3 and 4, the position of the joint portion 4 in the width direction of the fiber sheet 10 </ b> A and the positions of the large diameter portions 31 and 32 of the uneven rolls 33 and 34 are matched. Is preferred. Specifically, as shown in FIG. 3, the fiber sheet 10 </ b> A is formed with a plurality of joint rows in which a plurality of joints 4 are formed in series and linearly in the MD direction. (10 are shown in FIG. 3). In FIG. 3, the joint part R ₁ located on the leftmost side and other joint parts included in every other joint part row R ₁ are The positions of the large-diameter portions 31 of the concave-convex roll 33 coincide with each other, and the joint portions included in each of the alternate joint row R ₂ from there, starting with the _second joint row R ₂ from the left. The position of the large-diameter portion 32 of the other uneven roll 34 is made to coincide. In FIG. 3, the range indicated by reference numerals 31 and 32 overlaps with the peripheral surfaces of the large-diameter portions 31 and 32 of the respective rolls at a point in time when the fiber sheet 10 </ b> A is inserted between the two uneven rolls 33 and 34. The range is shown.

  According to this manufacturing method, when the fiber sheet 10A passes between the concavo-convex rolls 33 and 34, as shown in FIGS. While the diameter parts 31 and 32 overlap, the area | region between the large diameter parts which do not overlap with the large diameter parts 31 and 32, ie, the area | region between the junction part row | line | column mentioned above is positively extended. Accordingly, it is possible to efficiently stretch the portion other than the joint portion of the fiber sheet 10A while preventing the joint portion 4 from being broken (such as peeling between layers). In addition, this stretching causes a change that does not recover even if the fiber sheet 10A contracts in the non-elastic fiber layers 2 and 3. Due to the change, the degree to which the non-elastic fiber layers 2 and 3 hinder free expansion and contraction of the elastic fiber layer 1 is greatly reduced. As a result, according to this production method, it is possible to efficiently produce a stretchable nonwoven fabric 10 that is highly stretchable and has a good appearance with little tearing and fuzzing.

  By the stretching process, the thickness of the fiber sheet 10A is preferably increased 1.1 times to 4 times, particularly 1.3 times to 3 times before and after the stretching process. As a result, the fibers of the non-elastic fiber layers 2 and 3 are plastically deformed and stretched to make the fibers thin. At the same time, the non-elastic fiber layers 2 and 3 become more bulky and have a good texture and good cushioning properties.

  If the thickness of the fiber sheet 10A before being stretched is thin, there is an advantage that the space for transporting and storing the roll sheet of the fiber sheet 10A can be reduced.

  Furthermore, it is preferable that the bending rigidity of the fiber sheet 10 </ b> A is changed to 30 to 80%, particularly 40 to 70% as compared with that before the drawing process by the drawing process. As a result, a soft nonwoven fabric with good drapability can be obtained. Moreover, since the bending rigidity of 10 A of fiber sheets before extending | stretching process is high, since it becomes difficult for a wrinkle to enter into the fiber sheet 10A by a conveyance line, it is preferable. In addition, the fiber sheet 10A is not wrinkled even during the drawing process, and it is easy to process, which is preferable.

  The thickness and bending rigidity of the fiber sheet 10A before and after the stretching process are the elongation of the fibers used for the inelastic fiber layers 2 and 3, the embossing pattern of the embossing rolls, the pitches of the concavo-convex rolls 33 and 34, the thicknesses of the tips, and the mesh Can be controlled by quantity.

  It is preferable that the peripheral surface of the large-diameter portion of the uneven roll is not sharp so as not to damage the fiber sheet 10A. For example, as shown in FIGS. 4B and 4D, a flat surface having a predetermined width is preferable. The width W (see FIG. 4B) of the tip surface of the large-diameter portion is preferably 0.3 to 1 mm, and is 0.7 to 2 times, particularly 0.9. It is preferably -1.3 times. Thereby, a high intensity | strength sheet | seat is obtained, without destroying an inelastic fiber completely.

The pitch P between the large-diameter portions (see FIG. 4B) is preferably 0.7 to 2.5 mm, 1.2 to 5 times the dimension of the joint portion 4 in the CD direction, particularly 2 It is preferable to be 3 times. As a result, a cloth-like appearance can be obtained, and a good touch can be obtained. The pitch spacing of the CD direction of the joint 4 (junction sequence R ₁ together intervals adjacent in the CD direction or junction sequence R ₂ spacing adjacent to each other in the CD direction) to the pitch P between the large-diameter portion On the other hand, in order to match the positional relationship, it is basically doubled, but if the fiber sheet 10A is in the range of 1.6 times to 2.4 times due to elongation in the CD direction and neck-in, the positions are matched. It is possible.

  The fiber sheet 10A sent out from the stretching device 30 is released from the stretched state in the width direction. That is, the elongation is eased. As a result, the fiber sheet 10A exhibits elasticity and the sheet 10A contracts in the width direction. Thereby, the intended stretchable nonwoven fabric 10 is obtained. When the stretched state is released, the stretched state may be completely released, or the stretched state may be released in a state where the stretched state is maintained to some extent as long as stretchability is exhibited. Good.

  The present invention is not limited to the embodiment. For example, the stretchable nonwoven fabric 10 of the above-described embodiment has a configuration in which the same or different substantially inelastic non-elastic fiber layers 2 and 3 are laminated on both surfaces of the elastic fiber layer 1. Instead, a two-layer structure in which an inelastic fiber layer is laminated on one surface of the elastic fiber layer may be used. When a stretchable nonwoven fabric having a two-layer structure is used as a constituent material of an absorbent article, particularly when used on a portion that touches the user's skin, the non-elastic fiber layer is used to face the wearer's skin. It is preferable from the viewpoints of touch and prevention of stickiness.

  In the method shown in FIG. 4, the fiber sheet 10 </ b> A is stretched without being sandwiched between the large diameter portion of one uneven roll and the small diameter portion of the other uneven roll. And it can also extend | stretch in the state which pinched | interposed the fiber sheet 10A between both. That is, it can be stretched in a state of bottoming through the fiber sheet. In addition, the stretching step may be performed by the method described in JP-A-6-133998.

  Moreover, in the said manufacturing method, although 10 A of fiber sheets were extended | stretched in CD direction, it can replace with this and can be extended in MD direction.

[Example 1]
The stretchable nonwoven fabric shown in FIG. 1 was manufactured using the apparatus shown in FIG. First, short fibers (core: PET, sheath: PE) having a diameter of 17 μm and a fiber length of 51 mm were supplied to a card machine to form an inelastic fiber web 3 ′ composed of a card web. The basis weight of the web 3 ′ was 10 g / m ² . On this non-elastic fiber web 3 ′, an elastic fiber web 1 ′ made of continuous fibers was laminated.

The elastic fiber web 1 ′ was formed by the following method. Kraton G1657 (trade name), which is an elastic resin made of SEBS, was used. Using an extruder, the molten resin was extruded from a spinning nozzle at a die temperature of 310 ° C., and an elastic fiber web made of continuous fibers was formed 1 ′ on a net by a spinning blow method. The diameter of the elastic fiber was 32 μm. The basis weight of the web 1 ′ was 40 g / m ² .

On the elastic fiber web 1 ′, a non-elastic fiber web 2 ′ made of the same short fibers as described above was laminated. The basis weight of the web 2 ′ was 10 g / m ² .

The laminate of these three-layer webs was introduced into a heat treatment machine, and heat treatment was performed by blowing hot air using an air-through method. The heat treatment conditions were a net temperature of 140 ° C., a hot air flow rate of 2 m / second, a spraying pressure of 0.1 kPa, a spraying time of 15 seconds, and a net air permeability of 500 cm ³ / (cm ² · s). By this heat treatment, a fiber sheet 10B in which three layers of webs were integrated was obtained.

  Next, hot embossing was applied to the fiber sheet 10B. The hot embossing was performed using an embossing device provided with an embossed convex roll and a flat metal roll. As the embossed convex roll, a dot-shaped convex roll having a large number of convex portions with a pitch in the CD direction of 2.0 mm was used. The temperature of each roll was set to 110 ° C. By this hot embossing, a fiber sheet 10A in which the joints were formed in a regular pattern was obtained.

The fiber sheet 10A was stretched. The stretching process was performed using a stretching apparatus including a pair of concavo-convex rolls in which large diameter portions and small diameter portions were alternately formed in the axial length direction. The pitch between the large diameter portions and the small diameter portion was 2.0 mm (the pitch P between the large diameter portions was 1.0 mm). The pushing amount of the upper and lower concavo-convex rolls was adjusted, and the fiber sheet 10A was stretched in the CD direction at a stretch ratio of 3.5. As a result, a nonwoven fabric having a basis weight of 60 g / m ² that expands and contracts in the CD direction was obtained. In addition, the conveyance speed of each of the above steps was 10 m / min. The properties of the resulting stretchable nonwoven fabric are shown in Table 1 below. Table 2 lists the thickness and bending rigidity value of the fiber sheet 10A before drawing.

The measurement method for each item in the table is as follows.
<Thickness>
The stretchable nonwoven fabric was allowed to stand for 2 days or more in an environment of 23 ± 2 ° C. and 60% RH with no load, and the thickness was determined by the following method. The stretchable nonwoven fabric was sandwiched between flat plates with a load of 0.5 cN / cm ^{2, and} the cross section was observed with a microscope at a magnification of 25 to 200 times under the state, and the average thickness of each layer was determined. The total thickness was determined from the distance between the flat plates. Regarding the fiber penetration, the midpoint of mutual penetration was defined as the thickness.
<Air permeability>
The air permeability of the elastic fiber layer was measured before the heat treatment with only the elastic fiber layer. The air permeability of the stretchable nonwoven fabric was measured after stretching.
<Fuzz removal test>
A stretchable nonwoven fabric of 200 mm × 200 mm was used as a test piece. One surface of this test piece was used as an evaluation surface. With this evaluation surface facing up, the four sides of the test piece were fixed to the plate with gummed tape. A friction plate around which a sponge (Mortoprene MF-30) was wound was set on the test piece. The sponge load was 240 g. The friction plate was rotated with one set consisting of three forward rotations and three reverse rotations. This was done 15 sets. One rotation was a speed of 3 seconds. All fibers attached to the sponge by rotation were attached to the adhesive tape. This adhesive tape was stuck on a black mount. The degree of fluff removal was evaluated from the surface state of the test piece and the fibers attached to the adhesive tape.
○: The test piece has almost no fuzz or fluff. There is almost no fiber adhesion on the adhesive tape.
Δ: Fluff or fluff is observed on the test piece, but there is no fiber clump in the adhesive tape.
X: Fluff or fluff is observed on the test piece, and many clumps of fibers are observed on the adhesive tape.
<Strength, elongation and residual strain>
A rectangular test piece having a size of 50 mm in the stretch direction of the stretchable nonwoven fabric and 25 mm in a direction perpendicular to the stretch direction was cut out. The test piece was attached to Orientec Tensilon RTC1210A. The distance between chucks was 25 mm. The test piece was stretched at a speed of 300 mm / min in the stretching direction of the nonwoven fabric, and the load at that time was measured. The load at the maximum point at that time was defined as the maximum strength. Moreover, when the length of the test piece at that time was set to B and the length of the original test piece was set to A, {(BA) / A} * 100 was made into the maximum elongation (%). Further, a 100% elongation cycle test was performed, and the strength at 100% elongation was determined from the load at 100% elongation. Furthermore, after 100% elongation, the ratio of the length that did not return when returning to the origin at the same speed was measured, and the value was defined as the residual strain.
<Bending rigidity>
Measurement was performed using HOM-3 manufactured by Daiei Scientific Instruments.

  When the cross section of the obtained stretchable nonwoven fabric was observed with an SEM, the constituent fibers of the elastic fiber layer and the constituent fibers of the non-elastic fiber layer were heat-sealed, and these fiber layers were bonded together. Moreover, it was confirmed that some of the constituent fibers of the non-elastic fiber layer have entered the thickness direction of the elastic fiber layer. The constituent fibers of the elastic fiber layer maintained the fiber form. The stretchable nonwoven fabric had a good texture and was soft and stretchable. Furthermore, when a disposable diaper was made using this stretchable nonwoven fabric for the exterior, this diaper was soft to the touch and highly breathable. It was.

[Example 2]
Instead of the elastic resin used in Example 1, Pandex T-1180N (trade name) manufactured by DIC Bayer, which is an elastic resin made of thermoplastic polyurethane, was used. Resin was extruded at a die temperature of 230 ° C., and an elastic fiber made of continuous fibers having a fiber diameter of 20 μm was obtained by a spinning blow method. The basis weight of the elastic fiber web 1 ′ was 30 g / m ² . Except for these, a stretchable nonwoven fabric was obtained in the same manner as in Example 1. The properties of the resulting stretchable nonwoven fabric are shown in Table 1 below. In addition, Table 2 shows the thickness and bending rigidity value of the fiber sheet 10A before stretching.

Example 3
Instead of the elastic resin used in Example 1, EG8200 (trade name) manufactured by Dow Chemical Co., which is an elastic resin made of polyolefin elastomer, and Kraton G1657 (trade name), which is an elastic resin made of SEBS, were used. . These resins were extruded at a die temperature of 320 ° C., and a side-by-side type composite elastic fiber made of continuous fibers having a fiber diameter of 23 μm was obtained by a spinning blow method. The resin weight ratio was 5: 5. The basis weight of the elastic fiber web 1 ′ was 20 g / m ² . Except for these, a stretchable nonwoven fabric was obtained in the same manner as in Example 1. The properties of the resulting stretchable nonwoven fabric are shown in Table 1 below. In addition, Table 2 shows the thickness and bending rigidity value of the fiber sheet 10A before stretching.

Example 4
Short fibers (core: PET, sheath: PE) having a diameter of 18 μm and a fiber length of 51 mm were supplied to a card machine to form an inelastic fiber web 3 ′ made of a card web. This web 3 'was introduced into a heat treatment machine, hot air was blown by an air-through method, and heat treatment was performed to temporarily fuse the constituent fibers. The heat treatment condition was an on-net temperature of 137 ° C. By this heat treatment, an inelastic fiber web 3 ′ having a basis weight of 10 g / m ² on which the constituent fibers were temporarily fused was obtained. On this non-elastic fiber web 3 ', an elastic fiber web 1' composed of continuous fibers was directly laminated.

The elastic fiber web 1 ′ was formed by the following method. An elastic resin made of a styrene elastomer resin was used as a raw material. The molten resin was extruded from a spinning nozzle at a die temperature of 290 ° C. using an extruder, and both the resin and hot air were blown out by a melt blown method to form the elastic fiber web 1 ′ directly on the non-elastic fiber web 3 ′. A molded net having an air permeability of 420 cm ³ / (cm ² · s) was used. The diameter of the elastic fiber was 14 μm. The basis weight of the elastic fiber web 1 ′ was 15 g / m ² .

On the elastic fiber web 1 ′, a non-elastic fiber web 2 ′ made of the same short fibers as described above was laminated. The basis weight of the web 2 ′ was 10 g / m ² . The constituent fibers of the web 2 'are not temporarily fused.

The laminate of these three-layer webs was introduced into a heat treatment machine, and heat treatment was performed by blowing hot air using an air-through method. The heat treatment conditions were a net temperature of 137 ° C., a hot air flow rate of 2 m / sec, a spraying pressure of 0.2 kPa, a spraying time of 15 seconds, and a net air permeability of 500 cm ³ / (cm ² · s). By this heat treatment, a fiber sheet 10B in which three layers of webs were integrated was obtained.

  Next, hot embossing was applied to the fiber sheet 10B. The hot embossing was performed using an embossing device provided with an embossed convex roll and a flat metal roll. As the embossed convex roll, a dot-shaped convex roll having a large number of convex portions with a pitch of 2.0 mm in both the CD direction and the MD direction was used. The temperature of each roll was set to 120 ° C. By this hot embossing, a fiber sheet 10A in which the joints were formed in a regular pattern was obtained. This fiber sheet 10A was taken up as a nonwoven fabric.

  The fiber sheet 10A was unwound from the original fabric, and was stretched in the CD direction at a stretch ratio of 3 times in the same manner as in Example 1. Other operations were performed in the same manner as in Example 1 to obtain a stretchable nonwoven fabric. The properties of the resulting stretchable nonwoven fabric are shown in Table 1 below. In addition, Table 2 shows the thickness and bending rigidity value of the fiber sheet 10A before stretching.

Drawing 1 is a mimetic diagram showing the section structure of one embodiment of the elastic nonwoven fabric of the present invention. FIG. 2 is a schematic view showing a preferred apparatus used for producing the stretchable nonwoven fabric shown in FIG. FIG. 3 is a plan view showing an example of a fiber sheet to be stretched. 4A is a cross-sectional view taken along the line aa in the CD direction of the fiber sheet shown in FIG. 3, and FIG. 4B is a diagram of the deformed state (stretched state) between the concavo-convex rolls. Sectional drawing corresponding to (a), FIG.4 (c) is sectional drawing in alignment with the cc line | wire of the CD direction of the fiber sheet shown in FIG.3, FIG.4 (d) is the state deform | transformed between the uneven | corrugated rolls ( FIG. 5 is a cross-sectional view corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic fiber layer 2 Inelastic fiber layer 3 Inelastic fiber layer 4 Embossed part (joining part)
10A Fiber sheet 10 Elastic nonwoven fabric

Claims (8)

A substantially inelastic non-elastic fiber layer is disposed on at least one surface of the elastic fiber layer;
Both fiber layers are joined together by thermal fusion of fiber intersections and fiber entanglement in a state where the constituent fibers of the elastic fiber layer maintain the fiber form,
A part of the constituent fibers of the non-elastic fiber layer enters the elastic fiber layer, and / or a part of the constituent fibers of the elastic fiber layer enters the non-elastic fiber layer ,
An elastic nonwoven fabric with a microscopic corrugated cross section .   By the air-through method, a part of the constituent fibers of the non-elastic fiber layer has entered the elastic fiber layer and / or a part of the constituent fibers of the elastic fiber layer has entered the non-elastic fiber layer. The stretchable nonwoven fabric according to Item 1.   The thickness of the non-elastic fiber layer is 1.2 to 20 times the thickness of the elastic fiber layer, and the basis weight is higher in the elastic fiber layer than in the non-elastic fiber layer. The stretchable nonwoven fabric described.   The stretchability according to any one of claims 1 to 3, wherein the fiber diameter of the constituent fibers of the elastic fiber layer is 1.2 to 5 times the fiber diameter of the constituent fibers of the non-elastic fiber layer and is 10 to 100 µm. Non-woven fabric.   The stretchable nonwoven fabric according to any one of claims 1 to 4, wherein the constituent fibers of the elastic fiber layer are made of a thermoplastic elastomer.   The stretchable nonwoven fabric according to claim 5, wherein the thermoplastic elastomer comprises a styrene elastomer, a polyolefin elastomer, a polyester elastomer or a polyurethane elastomer.   The stretchable nonwoven fabric according to any one of claims 1 to 6, wherein the constituent fibers of the inelastic fiber layer are short fibers. The stretchable nonwoven fabric according to any one of claims 1 to 7, wherein an elastic fiber layer is formed from an elastic web having an air permeability of 8 m / (kPa · s) or more.

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