JPH09286085A - Humidity permeable composite sheet and absorbable article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a humidity permeable composite sheet excellent in the touch or feel. SOLUTION: This humidity permeable composite sheet 1 is constituted by laminating an extensible elastic nonwoven fabric 2 obtained by fusing the entangling points of extensible elastic composite fibers consisting of a first component being a hard elastic component composed of crystalline polypropylene and a second component composed of a thermoplastic elastomer to form a large number of bonded points on an unperforated sheet 3 composed of a humidity permeable elastomer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a moisture-permeable composite sheet and an absorbent article using the same, and more specifically to a moisture-permeable composite sheet having high stretchability and an excellent texture and an absorbent article using the same. It is about.

[0002]

2. Description of the Related Art A breathable sheet is known in which a stretchable nonwoven fabric is laminated on a sheet made of a breathable elastomer. For example, JP-A-6-13
In Japanese Patent Laid-Open No. 4000 and Japanese Patent Laid-Open No. 7-70936,
Disclosed is a stretchable moisture-permeable waterproof sheet characterized by producing a non-porous moisture-permeable polyurethane film using a polyurethane resin synthesized mainly from polyethylene glycol and polyisocyanate, and laminating a stretchable nonwoven fabric on at least one surface thereof. Has been done.

The stretchable nonwoven fabric is generally manufactured from elastic fibers obtained by processing a thermoplastic elastomer into a fibrous shape. However, the manufacturing method is limited to the direct sheet method. It was being done. Moreover, since the stretchable non-woven fabric produced by the direct sheet method has rubber-specific touch, the moisture-permeable sheet formed by laminating such stretchable non-woven fabric was not suitable as a material for clothing or the like. .

Therefore, Japanese Patent Publication No. 7-35632 proposes an elastic fiber which can be made into a non-woven fabric by a usual method. The elastic fiber is an elastic composite fiber composed of a first component made of crystalline polypropylene and a second component made of a thermoplastic resin having a melting point of 100 to 150.

However, since the elastic nonwoven fabric formed from the elastic composite fiber described in the above publication does not have the elastic elasticity property of the thermoplastic resin of the second component, the elastic elasticity as the composite fiber is substantially exhibited. However, it has a drawback that it is still hard after heat-bonding, and it has a drawback that the touch and texture are still insufficient for use as a material for clothing.

Therefore, an object of the present invention is to provide a moisture-permeable composite sheet which is excellent in touch and feel. Another object of the present invention is to provide an absorbent article which prevents stuffiness and has an excellent texture.

[0007]

Means for Solving the Problems As a result of intensive investigations by the present inventors, a two-component stretchable elastic composite fiber composed of a combination of specific components, in particular, a stretchable elastic composite fiber in which a thermoplastic elastomer is selected as the second component. It has been found that the above object can be achieved by a moisture-permeable composite sheet obtained by laminating a stretchable elastic nonwoven fabric used as a constituent fiber on a moisture-permeable sheet.

The present invention has been made on the basis of the above findings, in which a hard elastic component made of crystalline polypropylene is used as a first component and a thermoplastic elastomer is used as a second component.
A stretchable elastic nonwoven fabric made of stretchable elastic composite fibers as a component is provided to provide a moisture-permeable composite sheet characterized by being laminated on a non-porous sheet made of a moisture-permeable elastomer, thereby achieving the above object. is there.

The present invention also provides a liquid-permeable surface sheet,
An absorbent article comprising a liquid-impermeable back sheet and a liquid-retaining absorber interposed between the both sheets, wherein the back sheet has a hard elastic component made of crystalline polypropylene as a first component. And an absorbent article characterized by using a breathable composite sheet obtained by laminating a stretchable elastic nonwoven fabric made of stretchable elastic composite fiber containing a thermoplastic elastomer as a second component on a non-porous sheet made of a breathable elastomer. To do.

The present invention also provides a liquid-permeable surface sheet,
A liquid-impermeable back sheet, and a body having a liquid-retaining absorber interposed between the both sheets, and a pair of elastic side panels, wherein the pair of elastic side panels are respectively waist openings and A pants-type disposable diaper, which is arranged between a pair of leg openings, and in which the waist opening and the pair of leg openings are provided with elastic members for forming gathers at their peripheral portions, respectively. As the stretchable side panel, a stretchable elastic nonwoven fabric made of stretchable elastic composite fiber having a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component is a non-porous sheet made of a moisture permeable elastomer. To provide a pants-type disposable diaper characterized by using a moisture-permeable composite sheet laminated on top That.

Furthermore, the present invention provides a liquid-permeable surface sheet,
It has a liquid-impermeable back sheet and a liquid-retaining absorber interposed between these sheets, and forms a ventral part located on the wearer's ventral side and a dorsal part located on the back side when used. In the deployed disposable diaper, flaps are continuously provided on both left and right edges of the back side,
At least one of the left and right flaps is provided with a flap fastening portion at its tip, so that the left and right flaps can be fastened to the wearer's ventral side. The diaper fastening portions are provided on the right and left sides of the ventral side portion,
The diaper fastening portion is brought into contact with the flap so that the diaper can be fastened. The flap has an elastic portion at least on the base end side thereof, and the elastic portion is made of crystalline polypropylene. A moisture-permeable composite sheet obtained by laminating a stretchable elastic nonwoven fabric composed of stretchable elastic composite fibers containing a hard elastic component as a first component and a thermoplastic elastomer as a second component on a non-porous sheet made of a moisture-permeable elastomer. The present invention provides a deployable disposable diaper characterized by the following.

Further, the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber, and a waist opening and a pair of leg openings are formed. In the pants-type disposable diaper, each of the waist opening and the pair of leg openings is provided with an elastic member that forms a gather that is substantially continuous over the entire circumference of the waist opening. As a hard elastic component made of crystalline polypropylene as a first component, a stretchable elastic nonwoven fabric made of stretchable elastic composite fibers having a thermoplastic elastomer as a second component is laminated on a non-porous sheet made of a moisture permeable elastomer. The present invention provides a pants-type disposable diaper characterized by using a moisture-permeable composite sheet.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the moisture-permeable composite sheet of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a schematic cross-sectional view showing the structure of a preferred embodiment of the moisture-permeable composite sheet of the present invention.

The moisture-permeable composite sheet 1 of the embodiment shown in FIG.
Is an elastic elastic nonwoven fabric 2 made of elastic elastic composite fibers having a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component,
It is laminated (laminated) on a non-porous sheet 3 made of a moisture-permeable elastomer. The stretchable elastic nonwoven fabric 2 and the non-perforated sheet 3 that constitute the moisture-permeable composite sheet 1 will be described below.

The stretchable elastic nonwoven fabric 2 is a two-component stretchable elastic composite fiber (hereinafter simply referred to as "composite fiber") having a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component. ) Consists of. The composite fiber has better slipperiness than the conventional elastic fiber made of a thermoplastic elastomer, and is particularly easy to process into a non-woven fabric by using a card machine.

The hard elastic component used as the first component of the composite fiber constituting the stretchable elastic nonwoven fabric 2 is crystalline polypropylene.

The crystalline polypropylene may be used without any particular limitation as long as it has a hard elastic property. Preferred examples of the crystalline polypropylene include propylene homopolymer, propylene-based copolymer with ethylene, and propylene-based copolymer with α-olefin.

The crystalline polypropylene preferably has a crystallinity of 40% or more. If the crystallinity is less than 40%, the elongation recovery rate of the fiber may be insufficient. The crystallinity is a value calculated based on the energy required for melting the crystal measured by the DSC (differential scanning calorimetry) method.

The crystalline polypropylene has a melt index of preferably 1 to 200 g / 10 minutes, more preferably 3 to 50 g / 10 minutes. If the melt index is less than 1 g / 10 minutes, the melt viscosity may be too high and spinning may be difficult,
If it exceeds 200 g / 10 minutes, the melt viscosity is too low, and thread breakage may occur before fiberization. The melt index was determined at 230 ° C. and 2.1 in accordance with ASTM D-1238.
This is a value measured under a load of 6 kgf.

The crystalline polypropylene preferably has a weight-average molecular weight of 10,000 to 1,000,000 because the stretchable elasticity can be easily expressed and the composite fiber can be easily spun. More preferably, it is from 10,000 to 600,000.

The second component of the composite fiber forming the stretchable elastic nonwoven fabric 2 is a thermoplastic elastomer. The thermoplastic elastomer is generally composed of a flexible component (soft segment, soft phase) having rubber elasticity in the molecule and a molecular constraint component (hard segment, hard phase) for preventing plastic deformation. . The thermoplastic elastomer can be classified according to the type of its hard segment, and in the present invention, a styrene-based elastomer, an olefin-based elastomer, a PVC-based elastomer, a urethane-based elastomer, an ester-based elastomer, an amide-based elastomer, a syndiotactic Poly (1,2-butadiene) and poly (trans-1,4-
Isoprene) and the like can be preferably used. Among these thermoplastic elastomers, urethane-based elastomers and ester-based elastomers can be particularly preferably used.

The urethane elastomer preferably used is, for example, a block having a urethane bond as a hard segment and a block having a polycarbonate polyol, an ether polyol, a caprolactone polyester, or an adipate polyester as a soft segment. And a urethane elastomer composed of Examples of preferably used as the ester elastomer include, for example, an ester elastomer composed of a block having an aromatic polyester as a hard segment and an aliphatic polyether as a soft segment, or a block having an aliphatic polyester. No.

In particular, considering the processability, cost, light resistance, chemical resistance, skin irritation and the like, an ethylene-α-olefin copolymer produced by using metallocene as a catalyst is used as the thermoplastic elastomer. It is particularly preferable to use. In the ethylene-α-olefin copolymer, the α-olefin copolymerized with ethylene is an α-olefin having 3 to 30 carbon atoms, for example,
Propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-pentene, octadecene, etc. Is mentioned. Among these, 1-hexene, 1-octene, 1-heptene,
4-Methyl-1-pentene is preferably used. The blending ratio of ethylene and α-olefin in the ethylene-α-olefin copolymer is preferably 40 to 98% by weight of ethylene and 60 to 2% by weight of α-olefin.

In the present invention, in order to modify the melt fluidity of these thermoplastic elastomers, thermoplastics, oil components, etc. may be added to these thermoplastic elastomers.

The above thermoplastic elastomer has 100 parts thereof.
When the elongation recovery rate at the time of% elongation is 50% or more, for example, when the moisture-permeable composite sheet of the present invention is used for clothing or the like, it becomes possible to follow the motion of the human body without causing damage. It is preferable from the point.

In the above composite fiber, the content of the first component is preferably 5 to 70% by weight, and the second component is preferably
The content of the component is 95 to 30% by weight, more preferably the content of the first component is 10 to 60% by weight,
The content of the second component is 90 to 40% by weight, and more preferably the content of the first component is 10 to 50% by weight.
And the content of the second component is 90 to 50% by weight. If the content of the first component exceeds the upper limit or the content of the second component does not reach the lower limit, the stretchability of the composite fiber may be insufficient, If the content is less than the above lower limit or the content of the second component exceeds the above upper limit, the area where the second component is exposed on the surface of the composite fiber increases, and the tactile sensation may decrease. In addition, it may be difficult to spin the sheath-core type composite fiber, so that it is preferably within the above range.

The stretchable elastic conjugate fiber is not particularly limited in its fiber form as long as it is a fiber form capable of exhibiting stretchable elasticity. Preferable fiber forms of the stretchable elastic composite fiber include a parallel type (side-by-side type), a split type (fiber whose cross section is divided into arcs), and a sheath-core type [sheath
Core type (concentric type and eccentric type)] and the like. The stretchable elastic composite fiber in the fiber form can be produced by a known spinning method. When the sheath-core type composite fiber is used, the spinning is performed so that the component having the lower melting point of the first component and the second component becomes the sheath.

The above-mentioned composite fiber produced by the above-mentioned known spinning method may be directly formed into a web after spinning to form a non-woven fabric, or from the viewpoint of further exhibiting stretchability.
The nonwoven fabric may be formed into a web after being subjected to a predetermined stretching treatment after spinning. As the conditions for the stretching treatment, the stretching temperature is preferably 20 to 130 ° C., and the stretching ratio is preferably 1 to 6 times. For heating the stretchable elastic composite fiber in the stretching treatment, for example, hot air,
A heating means such as steam or infrared rays can be used.

The stretchable elastic composite fiber has a fiber diameter of 1
It is preferably -20 denier, more preferably 2-6 denier. If the fiber diameter is less than 1 denier, the spinnability in the spinning process may be deteriorated, and it may be difficult to fiberize. If it exceeds 20 denier, the texture may be deteriorated in practical use of the stretchable elastic nonwoven fabric. It is preferably within the above range.

The stretch elastic composite fiber preferably has an extension recovery rate of 20 to 100% at 100% extension, and more preferably 50 to 100%. If the elongation recovery rate is less than 20%, for example, when the moisture-permeable composite sheet of the present invention is used for clothing or the like, the function of following the movement of the human body may be insufficient.

The stretchable elastic conjugate fiber may be used in the form of staple fiber such as staple fiber or in the form of long fiber such as continuous filament.

The stretchable elastic nonwoven fabric 2 is the composite fiber 1 described above.
It is particularly preferable that the fiber is composed of 00%, but it may be a fiber mixed with other fibers. When the above-mentioned composite fiber is mixed with another fiber, the stretchable elastic nonwoven fabric 2
Preferably contains 30% by weight or more, and more preferably 50% by weight or more of the above composite fiber. If the amount of the composite fiber is less than 30% by weight, the elastic elasticity of the elastic elastic nonwoven fabric 2 may be significantly reduced and the elastic elastic nonwoven fabric 2 may be broken. Other fibers that can be mixed-spun with the above-mentioned composite fiber include fibers that are not deteriorated by heat treatment in the nonwoven fabric forming step, for example, thermoplastic synthetic fibers such as polyolefin, polyester and polyamide, natural fibers such as cotton, hemp and wool, and rayon and Regenerated fibers such as acetate, and various binder fibers that can be fused by the above heat treatment are included.

The stretchable elastic nonwoven fabric 2 can be produced by, for example, a method using a card machine or a direct sheet method. Specifically, it is made of a resin bond, a blend of binder fibers, a heat roll, a watery drink or the like. It can be manufactured by a non-woven fabric manufacturing method. In particular, the stretchable elastic nonwoven fabric 2 forms a web composed of the above-mentioned composite fibers (or contains the above-mentioned composite fibers) by using a known web-forming method, and then, between the entanglement points of fibers in the web, the first component It is preferably manufactured by fusion bonding by heat treatment at a temperature between the melting point of the second component and the melting point of the second component to form a large number of adhesion points. As a method for forming the web, when short fibers such as staple fibers are used as the composite fibers, there is a method for forming the web by opening the composite fibers using a card machine. When long fibers such as continuous filaments are used as the above-mentioned composite fibers, the melt-spun composite fibers are conveyed to a high-speed air stream and deposited / opened on a moving net to form a web (span). Bond method).

As a method for forming a nonwoven fabric by heat-treating the formed web (thermal bond method), for example, the web is passed through a through air dryer, and the entanglement points of the constituent fibers of the web are heated by hot air. Heat fusion between the spaces,
A method of forming a large number of adhesion points can be mentioned. in this case,
The temperature and supply amount of the hot air depend on the type of the constituent fibers of the web, the basis weight of the web, the transport speed, and the like, but in general, the temperature of the hot air is preferably 140 to 170 ° C. It is preferably 0.5 to 3 m / min. Further, as another method of the heat treatment, there is a hot embossing process using a pair of embossing rolls composed of an engraving roll and a smooth roll. In this case, heat embossing is performed by heating one or both of these rolls for use. The heating temperature of the embossing roll is preferably 120 to 170 ° C. When the embossing roll is heated to a temperature higher than this, the web may adhere to the embossing roll. As the engraving roll, for example, an iron roll having various patterns engraved on its surface can be used. On the other hand, as the smooth roll, a paper roll, a rubber roll, a silicon rubber roll, a urethane rubber roll, a metal roll, or the like can be used. Examples of the pattern of the engraving roll include, for example, pins, dot dots, turtle shells, lattices, vertical stripes, horizontal stripes, stitches, and patterns, and are not particularly limited to the patterns. The linear pressure of the embossing roll at the time of the hot embossing depends on the basis weight of the web, the conveying speed, the heating temperature of the embossing roll, and the like, but as a general range, it is preferably 10 to 150 kg / cm.

The stretchable elastic nonwoven fabric 2 preferably has an elongation recovery rate of 40 to 100% at 20% elongation, and more preferably 60 to 100%. If the elongation recovery rate is less than 40%, for example, when the moisture-permeable composite sheet of the present invention is used for clothing or the like, the human body may not sufficiently follow the movement of the body and the resistance may increase. .

The stretchable elastic nonwoven fabric 2 has a basis weight of 5 to 5.
200 g / m ² is preferable and 15-80 g /
m ² is more preferable. The basis weight is 5 g / m ²
If it is less than the above range, the above-mentioned extension recovery rate may be small and insufficient, and if it exceeds 200 g / m ² , it is difficult to form a nonwoven fabric by the thermal bond method and it is disadvantageous in terms of cost. It is preferable.

Further, the stretchable elastic nonwoven fabric 2 has the following properties.
The thickness under a load of 5 g / cm ² is preferably 0.05 to 5 mm, more preferably 0.2 to ² mm. If the thickness is less than 0.05 mm, the fiber density may be high and the stretchability may be insufficient,
When it exceeds 5 mm, when the moisture-permeable composite sheet of the present invention is used for clothing or the like, it gives a feeling of strangeness in practical use, and therefore it is preferable to set it within the above range.

Next, the non-porous sheet 3 in the moisture-permeable composite sheet 1 of the embodiment shown in FIG. 1 will be described. The non-porous sheet 3 is made of a moisture permeable elastomer. In the present specification, the phrase “consisting of a breathable elastomer” includes a case of only a breathable elastomer and a case of a mixture of a breathable elastomer and another substance. The moisture-permeable elastomer is not particularly limited in its type as long as it can exhibit moisture permeability and stretchability when formed into a sheet. In the present invention, as the moisture permeable elastomer, for example, a urethane elastomer, an ester elastomer, an amide elastomer, or the like can be used. These breathable elastomers are
They can be used alone or in combination of two or more. Particularly preferred as the moisture-permeable elastomer in the present invention are urethane elastomers and / or ester elastomers.

The urethane-based elastomer preferably used is the same as the urethane-based elastomer used as the second component of the composite fiber in the stretchable elastic nonwoven fabric 2. Also, Japanese Patent Application Laid-Open
-70936, JP-A-6-134000,
Japanese Examined Patent Publication No. 6-67604, Japanese Examined Patent Publication No. 52-21042
It is also possible to use urethane-based elastomers described in Japanese Patent Publication No. On the other hand, the stretchable elastic nonwoven fabric 2 is preferably used as the ester elastomer.
The same as the ester-based elastomer used as the second component of the conjugate fiber in 1. Further, JP-A-1-141669 and JP-A-51-111290.
It is also possible to use the ester-based elastomers described in Japanese Patent Laid-Open Publications and the like.

In the present invention, the non-porous sheet 3 is
It is preferably composed of the moisture-permeable elastomer and the olefinic thermoplastic resin. The use of such a non-perforated sheet is preferable because the adhesiveness to the stretchable elastic nonwoven fabric becomes extremely high. As the olefin-based thermoplastic resin, a homopolymer such as ethylene or propylene, a copolymer of ethylene or propylene and another polymerizable monomer, or the like can be used, but the olefin thermoplastic resin is not limited thereto. In particular, when low-density polyethylene (LDPE) and an olefin copolymer (for example, ethylene / ethyl acrylate copolymer) are used as the olefin-based thermoplastic resin, a melt obtained when the non-porous sheet 3 is molded is obtained. It is preferable because the fluidity and the adhesiveness are significantly improved. In this case, the blending amount of the moisture-permeable elastomer and the olefinic thermoplastic resin is preferably 99 to 51 parts by weight of the moisture-permeable elastomer and 1 to 49 parts by weight of the olefinic thermoplastic resin. More preferably, the moisture permeable elastomer is 99 to 60 parts by weight, and the olefinic thermoplastic resin is 1 to 40 parts by weight.

If necessary, various additives such as a lubricant, an antiblocking agent, a heat / light stabilizer, an antistatic agent, and a colorant may be added to the non-porous sheet 3.

The non-perforated sheet 3 is liquid impermeable. At the same time, the non-perforated sheet 3 exhibits moisture permeability not in the form of fine pores but in the form of taking in, diffusing and releasing water vapor of the moisture permeable elastomer. The thickness of the non-perforated sheet 3 is not particularly limited, but it is 5 to 50 from the viewpoint of drapeability (flexibility) as a composite sheet, texture and the like.
The thickness is preferably μm, more preferably 5 to 30 μm.

The moisture-permeable composite sheet 1 of the embodiment shown in FIG.
Has moisture permeability as a whole, and its moisture permeability is preferably 0.5 g / [100 cm ² · hr] or more. The moisture permeability is 0.5 g / [100 cm ² · h
If it is less than r], the moisture-permeable composite sheet of the present invention may cause stuffiness when used as a back sheet of a disposable diaper or the like. The moisture-permeable composite sheet 1 is preferably impermeable to liquid in addition to having moisture permeability, and its water pressure resistance is preferably 50 cm or more,
More preferably, it is 100 cm or more. The water pressure resistance is 5
If it is less than 0 cm, it may not be possible to prevent leakage of urine and the like when the moisture-permeable composite sheet of the present invention is used as a back sheet of a disposable diaper or the like.

The moisture-permeable composite sheet 1 of the embodiment shown in FIG.
There is no particular limitation on the grammage, but if the grammage is increased too much, the cost becomes high, so that the grammage is 15 to 130 g / m 2.
It is preferably ² and more preferably 25 to 50 g / m ² .

Further, the moisture-permeable composite sheet 1 of the embodiment shown in FIG. 1 has an extension recovery rate of 60 to 100% at 20% extension.
Is preferable, and more preferably 80 to 100%. If the expansion recovery rate is less than 60%, for example, when the stretchable elastic nonwoven fabric of the present invention is used for clothing and the like, the movement of the human body may not be sufficiently followed and the resistance may increase.

The moisture-permeable composite sheet of the present invention is not limited to the embodiment shown in FIG. 1 and various modifications are possible. For example, as described below, when the moisture-permeable composite sheet of the present invention is used as a back sheet of a disposable diaper, a landing tape for attaching an adhesive fastening tape to a predetermined position of the stretchable elastic nonwoven fabric is used. It is also possible to provide or provide a concave member that can be engaged with the convex member of the mechanical fastener. Further, in the moisture-permeable composite sheet 1 of the embodiment shown in FIG. 1, another non-woven fabric or sheet may be laminated on the non-porous sheet 3 one or more. Similarly, another non-perforated sheet or another sheet may be laminated on the stretchable elastic nonwoven fabric 2 in one or more layers. Moreover, in the moisture-permeable composite sheet of the embodiment shown in FIG.
The size of the elastic elastic nonwoven fabric 2 does not have to be the same as the size of the elastic elastic nonwoven fabric 2. For example, the elastic elastic nonwoven fabric 2 may be laminated only at a predetermined position on the non-porous sheet 3.

Next, a preferred method for manufacturing the moisture-permeable composite sheet 1 of the embodiment shown in FIG. 1 will be described. The moisture-permeable composite sheet is preferably manufactured by melt-molding the moisture-permeable elastomer into a sheet and then melt-laminating the stretchable elastic nonwoven fabric.

The above method will be described in detail. First, the moisture-permeable elastomer is mixed with another resin as needed, and the mixture is melt-kneaded by an extruder. Then, the melt-kneaded product is extruded from the slit of the T die, melt-formed into a sheet, and directly melt-laminated on the stretchable elastic nonwoven fabric manufactured separately. After melt laminating, the laminated body is inserted between a pair of heating rolls for thermocompression bonding,
Alternatively, the moisture-permeable composite sheet may be obtained by further improving the adhesion between the non-perforated sheet and the stretchable elastic nonwoven fabric by spot adhesion using a heating embossing roll or the like.

In the above method, the melt-molded non-porous sheet may be laminated on the stretch-elastic elastic nonwoven fabric manufactured in advance, or the production of the non-porous sheet and the stretch-elastic elastic nonwoven fabric may be performed. Both may be laminated while performing them in parallel. Further, the laminated surface of the elastic elastic nonwoven fabric may be subjected to corona treatment or frame treatment prior to lamination to further improve the adhesiveness between the elastic elastic nonwoven fabric and the non-porous sheet.

Although the preferred method for producing the moisture-permeable composite sheet of the embodiment shown in FIG. 1 has been described above in detail, the method for producing the moisture-permeable composite sheet is not limited to the above-mentioned method. For lamination with the stretchable elastic nonwoven fabric, a thermocompression-bonding laminate, a frame laminate or the like may be used, or a hot melt adhesive, a liquid adhesive or the like may be used.

Next, an absorbent article using the moisture-permeable composite sheet of the embodiment shown in FIG. 1 will be described with reference to FIG. 2, taking a disposable diaper as an example. Here, FIG. 2 is a perspective view showing a disposable diaper as an example of an absorbent article using the moisture-permeable composite sheet of the embodiment shown in FIG.

The disposable diaper 10 shown in FIG. 2 comprises a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and a liquid-retaining absorber (not shown) interposed between these sheets. Thus, the abdominal waist portion 13 located on the abdominal side of the wearer and the back waist portion 14 located on the dorsal side when used are formed. A pair of engaging portions 15, 15 made of a convex member of a mechanical fastener are provided on both sides of the back waist portion 14. Such a configuration and the material for forming the topsheet 11 and the absorber are the same as the conventionally known configuration and material. Thus, FIG.
In the disposable diaper 10 shown in (1), the moisture-permeable composite sheet is used as the back sheet 12. As described above, since the moisture-permeable composite sheet has moisture permeability, the disposable diaper 10 using the moisture-permeable composite sheet as the back sheet effectively prevents stuffiness inside.

In the disposable diaper 10, the breathable composite sheet used as the back sheet 12 is used so that the stretchable elastic nonwoven fabric side faces the outside of the disposable diaper 10. By using the moisture-permeable composite sheet in this way, it is possible to impart a cloth-like feel to the disposable diaper 10.
It can be used as a disposable diaper with excellent texture and appearance.

Further, in the disposable diaper 10, the stretchable elastic nonwoven fabric in the moisture-permeable composite sheet also serves as the recessed material engageable with the engaging portions 15, 15. Therefore, it is not necessary to separately provide a concave member that can be engaged with the engaging portions 15 and 15 on the back sheet 12, and the manufacturing process is simplified. Further, when the disposable diaper 10 is rolled up and discarded, the engaging portions 15, 15
Can be engaged with any position of the back sheet 12 and discarded, which is extremely convenient.

As the absorbent article using the moisture-permeable composite sheet of the embodiment shown in FIG. 1, there are sanitary napkins, incontinence pads and the like in addition to the disposable diaper, and the moisture-permeable composite sheet is absorbent. It is used in a desired shape depending on the application of the article.

Next, a pants-type disposable diaper using the moisture-permeable composite sheet of the embodiment shown in FIG. 1 will be described with reference to FIGS. 3 and 4. Here, FIG. 3 is a perspective view showing a pants-type disposable diaper using the moisture-permeable composite sheet of the embodiment shown in FIG. 1, and FIG. 4 is a partially broken development view of the pants-type disposable diaper shown in FIG. Is. In the pants-type disposable diaper shown in FIGS. 3 and 4, the same members as those in the disposable diaper shown in FIG. 2 are designated by the same reference numerals. In the pants-type disposable diaper shown in FIGS. 3 and 4, the same points as those of the disposable diaper shown in FIG. 2 will not be described in detail, but the description described in detail with reference to FIG.

The pants-type disposable diaper 100 shown in FIGS. 3 and 4 comprises a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and a liquid-retaining absorber 26 interposed between these sheets. It has a main body 28 having. The main body 28 is divided into a ventral side portion C located on the ventral side of the wearer, a back side portion A located on the back side, and a crotch portion B when worn. The absorber 26 has a rectangular shape, and is sandwiched and fixed by the top sheet 11 and the back sheet 12.

Elastic side panels 20 and 20 'are fixedly joined to the left and right edges of the abdominal portion C and the dorsal portion A, respectively. The stretchable side panels 20 and 20 of the ventral side portion C and the stretchable side panels 20 ′ and 20 ′ of the back side portion A are respectively the surface sheet side and the stretchable side of the stretchable side panel 20. Panel 20 '
And the seal sheet 31 is formed by contacting the surface sheet side of
It is joined and fixed via the seal portion 31. As a result, the waist opening 25 and the pair of left and right leg openings 2
7, 27 'are formed. That is, the elastic side panels 20 and 20 'become one elastic side panel that is joined and fixed by the seal portion 31 to form one elastic side panel, and the elastic side panel includes a waist opening and a pair of leg openings. It is in a state of being placed in between.

In the ventral side portion C and the back side portion A,
In the vicinity D of the waist opening, a belt-shaped waist elastic member 2
3, 23 'are arranged in parallel to the edges of the waist opening, that is, the abdominal waist portion 13 and the back waist portion 14. Further, in the waistline portion E located around the waistline of the wearer when worn, four thread-shaped waistline elastic members 21 and 21 'are provided in the abdominal portion C and the back portion A, respectively, and the abdominal waist portion 13 is provided. And the back waist portion 14 and are arranged so as to be sandwiched between the back sheet 12 and the absorber 26. The waistline elastic members 21, 2
1'and waist elastic members 23, 23 'are arranged so that the abdomen C and the back A are worn in the pants-type disposable diaper via the elastic side panels 20, 20'. Gathers are formed on the outer peripheral surface (the surface of the backsheet 12 mainly including the waist opening vicinity D and the waistline portion E) that is in contact with the user's waistline and waist.

Further, leg elastic members 22, 22 'are arranged on both left and right sides of the main body 28, and the pair of leg opening portions 17, 17' are formed by the leg elastic members 22, 22 '. A gather is formed at the peripheral edge so that it can fit in the crotch region.

Further, as shown in FIGS. 3 and 4, the back sheet 12 is provided in the back side portion A at a substantially central portion thereof.
A disposal tape 30 is provided on the surface of the. The above structure is the same as that of the conventional pants-type disposable diaper.

In the pants-type disposable diaper 100 shown in FIGS. 3 and 4, the stretchable side panels 20, 20 'are made of the moisture-permeable composite sheet. As described above, the moisture-permeable composite sheet has the same cloth-like feel as an ordinary nonwoven fabric and is composed of an elastic stretchable nonwoven fabric having an excellent texture. The pants-type disposable diaper 100 used as 20, 20 'has a comfortable wearing feeling. Further, since the moisture-permeable composite sheet has moisture permeability, the pants-type disposable diaper 100 can effectively prevent stuffiness inside.

In the pants-type disposable diaper 100 shown in FIGS. 3 and 4, the stretchable side panel is joined only to the left and right side edges of either the back side portion A or the abdominal side portion C. It may be fixed. Further, in the stretchable side panel, only the stretchable side panel bonded and fixed to any one of the back side portion and the abdominal side portion may be formed of the moisture permeable composite sheet. Further, the stretchable side panel may be one in which a non-stretchable portion formed of a non-stretchable member and a stretchable portion formed of the moisture-permeable composite sheet are arranged in multiple rows and alternately. . Further, the joining and fixing of the stretchable side panels 20, 20 'is not limited to a position corresponding to the side of the wearer's body, and may be a position of the wearer's body on the ventral side or the back side.

Next, another embodiment of the pants-type disposable diaper will be described with reference to FIGS. Here, FIG.
Fig. 6 is a perspective view showing another embodiment of the pants-type disposable diaper, and Fig. 6 (a) is a partially cutaway development view of the pants-type disposable diaper shown in Fig. 5 before assembly. Yes, FIG. 6B shows A- in FIG.
FIG. 3 is a sectional view taken along line A. In the pants-type disposable diaper shown in FIGS. 5 and 6A and 6B, the same members as those of the disposable diaper shown in FIG. In the pants-type disposable diaper shown in FIGS. 5 and 6A and 6B, the same points as those of the disposable diaper shown in FIG. 2 will not be described in detail, but the description described in detail with reference to FIG. It

The pants-type disposable diaper 100 shown in FIGS. 5 and 6A and 6B has a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and an hourglass-like curved shape. It has a liquid-retaining absorber 26. As shown in FIG. 6B, the entire surface of the absorber 26 is covered with the surface sheet 11, and
0 is formed. The back sheet 12 is shown in FIG.
As shown in FIG. 5, the absorbent main body 50 extends in the width direction from both side edges along the longitudinal direction of the absorbent main body 50, and
It extends in the longitudinal direction from the front and rear end portions along the width direction of 0. As a result, a pair of waist flaps 51, 51 'are formed on the ventral side portion located on the ventral side of the wearer when worn and on the back side portion located on the back side, respectively, and located on the crotch of the wearer when worn. A pair of side flaps 52, 52 'is formed in the crotch portion. The adhesive 53 is provided on the center line along the longitudinal direction of the absorbent body 50.
Is applied over the entire length in the longitudinal direction of the absorbent main body 50, and the absorbent main body 50 and the backsheet 12 are joined by the adhesive 53. In this case, the above-mentioned joining is performed so that the absorbent main body 50 is arranged at the same position as the position where the absorbent body is arranged in the conventional disposable diaper. Waist flaps 51 and 5 on the ventral and dorsal sides
1 ′ is configured such that both side edges thereof are joined and fixed on the surface sheet side surface to form a seal portion 31, and a waist opening portion 25 and a pair of leg opening portions 27, 27 ′ are formed. Waist elastic members 23, 23 'are joined and fixed in a stretched state along the edges of the front and rear waist flaps 51, 51' slightly inwardly of the front and rear edges thereof. Then, the waist elastic members 23, 23 'are sandwiched between the back sheets forming the waist flaps by folding back and front edges of the ventral and dorsal waist flaps 51, 51' to the surface sheet side. Then, as shown in FIG. 5, a gather that is substantially continuous is formed over the entire periphery of the waist opening 25. Similarly, the leg elastic members 22 and 22 'are joined and fixed in a stretched state slightly inside the edge of the side flaps 52 and 52' along the edge. Then, the edge portions of the side flaps 52, 52 'are folded back toward the surface sheet to sandwich the leg elastic members 22, 22' between the back sheets forming the side flaps, and as shown in FIG. To
A gather that is substantially continuous is formed over the entire circumference of the periphery of the pair of leg openings 27, 27 '.

In the pants-type disposable diaper 100 of this embodiment, the backsheet 12 has a three-layer structure in which the elastic elastic nonwoven fabric 2 is laminated on both sides of the non-perforated sheet 3 made of a moisture-permeable elastomer. And the moisture-permeable composite sheet of the present invention. In the pants-type disposable diaper 100 of the present embodiment, the stretchable elastic nonwoven fabric 2 having a cloth-like feel similar to a normal nonwoven fabric and having an excellent texture is located on the outer side and the skin contact side of the diaper. Therefore, the diaper itself has an excellent feeling and also has a comfortable wearing feeling when worn. Moreover, since the moisture-permeable composite sheet used as the back sheet has moisture permeability, the pants-type disposable diaper 100 effectively prevents stuffiness inside.

Next, a deployable disposable diaper using the moisture-permeable composite sheet of the embodiment shown in FIG. 1 will be described with reference to FIGS. 7 and 8. Here, FIG. 7 is a front view showing a deployable disposable diaper using the moisture-permeable composite sheet of the embodiment shown in FIG. 1, and FIG. 8 is a developed view of the deployable disposable diaper shown in FIG. 7. In the deployable disposable diaper shown in FIGS. 7 and 8, the same members as those in the disposable diaper shown in FIG. 2 are designated by the same reference numerals. In addition, in the deployable disposable diaper shown in FIGS.
Although the same points as those of the disposable diaper shown in FIG. 2 are not described in detail, the description described in detail with reference to FIG.

The deployable disposable diaper 200 shown in FIGS. 7 and 8 includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and a liquid-retaining absorber 26 interposed between these sheets. An abdomen C located on the abdominal side of the wearer and a dorsal side A located on the back side are formed during use.

The absorbent body 26 of the deployable disposable diaper 200 is curved and formed in an hourglass shape in which the crotch region is twisted. In addition, the crotch region of the top sheet 11 and the back sheet 12 is also curved in accordance with the shape of the absorber 26 as described above. The absorbent body 26 includes the topsheet 11 and the backsheet 1.
It is clamped and fixed by 2. In addition, the absorber 26
In the waist portion and the leg portion in the peripheral portion of the waist elastic elastic members 23, 23 'and leg elastic elastic members 22, 22' for fitting to the wearer's body when the diaper is worn, Each of the above surface sheets 11
And the back sheet 12 above.

Non-woven fabrics are respectively arranged on the left and right sides in the longitudinal direction of the deployable disposable diaper 200 to form three-dimensional guards 32, 32 '. The three-dimensional guard 32,3
The free ends 33, 33 'of the 2'are provided with three-dimensional guard elastic expansion / contraction members 34, 34' to form gathers.

Thus, in the deployable disposable diaper 200 shown in FIGS. 7 and 8, symmetrical flaps 40a and 40b are connected to the left and right edges A1 and A2 of the back side A, respectively. . The left and right flaps 40a, 40b
Each has a width that becomes narrower from the base end portion 42 to the tip end portion 41. The left and right flaps 40
Of the a and 40b, a flap fastening portion 44 is provided on a front end portion 41 of the flap 40a on the surface sheet side, and the front end portion 4 is provided on the back sheet side of the flap 40b.
1 by abutting the left and right flaps 40a,
40b can be fastened on the wearer's ventral side. In addition, on the left and right sides of the abdominal part C, two diaper fastening parts 48, 4 are provided, two on each side.
8'is provided so that the diaper fastening portions 48, 48 'can be brought into contact with the flaps 40a, 40b to fasten the diaper.

The flap fastening portion 44 and the diaper fastening portions 48 and 48 'are each formed by a convex member of a mechanical fastener. As the convex member of the mechanical sheet, a large number of anchor type male engaging members are arranged on the base sheet, or a large number of fishing type male engaging members are arranged on the base sheet. Etc. can be mentioned.

The flaps 40a and 40b have a length of 1. with respect to the length of the flaps 40a and 40b under non-stress.
It is preferable that the length can be extended to 2 to 2 times. That is, it is preferable that the expansion / contraction portion 43 has expansion / contraction performance such that the entire flap becomes 1.2 to 2 times longer than the entire length of the flap due to the expansion / contraction. here,
"Unstressed" means a state where no external force is applied. The degree of expansion and contraction of the flaps 40a and 40b (extendable length range) is the degree of expansion and contraction of waist gathers in the ventral side portion C formed by disposing the waist elastic member 23 on the ventral side portion C. Is preferably larger than. In this case, the degree of elasticity of the waist gather is 1.
It is preferably 1 to 1.4 times.

The flap body 45 of each of the flaps 40a and 40b is preferably formed by a laminate of at least two layers obtained by laminating a nonwoven fabric and a film sheet. In addition, it is preferable that the laminate is formed by bonding the nonwoven fabric and the film sheet by partial bonding, specifically, by bonding them in a dotted or linear manner. In particular, a laminate having a three-layer structure in which the nonwoven fabric is disposed on both the front and back surfaces of the film sheet is preferably used.

As shown in FIGS. 7 and 8, each of the flaps 40a and 40b has a stretchable portion 43 at least on the base end portion 42 side thereof. The stretchable portion 43 is the flap 4
The flap main body 45 of 0a, 40b and the left and right side edges A1, A2 of the back side portion A are provided so as to be connected to each other. Further, the stretchable portion 43 is made of the moisture permeable composite sheet. As described above, the moisture-permeable composite sheet has the same cloth-like feel as that of a normal nonwoven fabric and is composed of an elastic stretchable nonwoven fabric having an excellent texture. Therefore, the moisture-permeable composite sheet is used as the stretchable portion 43. The disposable diaper 200 used has a comfortable wearing feeling. In addition, the elastic portion 43 allows the flap 40 to move against the wearer's movement.
Since a and 40b follow each other, the fitting property is particularly good. Further, the binding force of the fastening portion 14 to the flap 10 is improved by the stretchability of the stretchable portion 13.

The ratio of the length L1 of the flap body 45 to the length L2 of the expandable portion 43 (see FIG. 8) is L1: L2.
= 90 to 0:10 to 100 is preferable.

In the deployable disposable diaper 200 shown in FIGS. 7 and 8, the flap has the elastic portion on the base end side thereof, but instead of this, the entire flap has the elastic portion. May consist of That is, FIG.
The entire flap may be made of the moisture-permeable composite sheet, as shown in FIG.

[0078]

EXAMPLES The moisture-permeable composite sheet of the present invention will be described in more detail below with reference to examples. However, it goes without saying that the present invention is not limited to such an embodiment. In addition,
In the following description, “part” means part by weight unless otherwise specified.

Example 1 Production of Composite Fiber Polypropylene (melt index;
8 g / 10 min, crystallinity; 43%) (50% by weight), and ethylene-α-olefin copolymer (100%) produced by using metallocene as a second component as a catalyst.
An eccentric sheath-core type (first component is a sheath and second component is a core) composite fiber was produced by melt spinning using a stretch recovery rate during stretching; 80%) (50% by weight). The fiber diameter of this conjugate fiber was 2 denier, and the elongation recovery rate at 100% elongation was 80% (see Table 1).

Production of Stretchable Elastic Nonwoven Fabric Staple fiber (2d × 51 m) of the above composite fiber
m) was opened using a card machine to form a web. Subsequently, the web is heat-treated by passing through a through air dryer (hot air temperature: 168 ° C., wind speed: 2 m / min),
A stretch elastic nonwoven fabric was produced. The stretch recovery rate at 20% elongation, the basis weight and the thickness under load of 0.5 g / cm ² of the thus-obtained stretchable elastic nonwoven fabric were measured. It was 75%, the basis weight was 32 g / m ² , and the thickness under load of 0.5 g / cm ² was 0.8 mm (see Table 2). Note that the second
Elongation recovery rate of 100% elongation of the component and the above composite fiber,
The method for measuring the extension recovery rate of the stretchable elastic nonwoven fabric at the time of 20% extension is as follows.

<Extension Recovery Rate of 100% Elongation of Second Component and Composite Fiber> A sample having a length of 51 mm and a fiber diameter of 2.0 denier was prepared, and Tensilon (RTA manufactured by Orientec Co., Ltd. was used.
-100) device, JIS L1015 and L1
The sample is fixed to the tester and stretched 100% according to 096. After holding this state for 1 minute, the displacement length L'when the stress becomes 0 when the stress starts to be returned at the same speed as the tensile speed
(Mm) is measured. The extension recovery rate (%) at 100% extension is calculated from the following formula with respect to the original fixed dimension L (mm). Extension recovery rate at 100 extension (%) = (L ′ / L) × 10
0 <Expansion recovery rate of stretchable elastic nonwoven fabric at 20% extension> A sample having the flow direction (continuous direction) of the stretchable elastic nonwoven fabric as a longitudinal direction is a vertical sample, and a sample having a direction orthogonal to the longitudinal direction is a horizontal sample. And the sample size is 200
A vertical sample and a horizontal sample each having 10 mm × 50 mm samples were sampled 10 each. Then, using a Tensilon (RTA-100 manufactured by Orientec Co., Ltd.), a sample fixing dimension of 150 mm and a pulling speed of 300 mm /
Perform a tensile test at min and extend 20%. Immediately thereafter, returning is started at a speed of 300 mm / min, and the length when the stress becomes 0 is measured. The extension recovery rate (%) at 20% extension is calculated from the following formula. Extension recovery rate at 20% extension (%) = (initial length / length after extension recovery) × 100

Production of Breathable Composite Sheet Ester type elastomer (XG-manufactured by Nippon Synthetic Chemical Industry)
830) 80 parts and 20 parts by weight of an olefinic thermoplastic resin (ethylene / vinyl acetate copolymer, VR103 manufactured by Mitsui DuPont Polychemical Co., Ltd.) are mixed with a Henschel mixer, and the obtained resin mixture is biaxially extruded. After melt-kneading with a machine, extrude it into a sheet from T-die (1
6.9 g / m ² ), and the above stretchable elastic nonwoven fabric was melt-laminated at a molding speed of 100 m / min to produce a moisture-permeable composite sheet. The air gap at this time is 120m.
m. With respect to this moisture-permeable composite sheet, the extension recovery rate at the time of 20% extension was measured by the above method, the moisture permeability was further measured by the following method, and the texture was evaluated. Table 3 shows the results.

<Measurement of Water Vapor Permeability> The moisture permeability was measured according to JIS Z0208. <Feeling> The touch was evaluated by 10 panelists. When the number of people who feels good to touch is 10 or 9, "◎", when 8 to 6 are "○", when 5 to 3 are "△", when 2 or 1 Was designated as "x".

[Examples 2 to 12] Composite fibers were produced by the same procedure as in Example 1 except that the components shown in Table 1 were used and the cross-sectional shape shown in Table 1 was used. A stretchable elastic nonwoven fabric was manufactured by using the obtained composite fiber by the same procedure as in Example 1. Table 2 shows the elongation recovery rate at 20% elongation, basis weight and thickness under load of 0.5 g / cm ^{2 of the} obtained elastic elastic nonwoven fabric.
Shown in After that, a moisture-permeable composite sheet was manufactured by the same procedure as in Example 1. The same measurement and evaluation as in Example 1 were performed on the obtained moisture-permeable composite sheet. Table 3 shows the results.

Comparative Examples 1 to 3 Fibers were produced by melt spinning using the components shown in Table 1. A spunbonded nonwoven fabric was produced using the obtained fiber. The elongation recovery rate, basis weight and 0.5 at 20% elongation of the non-woven fabric thus obtained
Table 2 shows the thickness under g / cm ² loading. After that, a moisture-permeable composite sheet was manufactured by the same procedure as in Example 1.
The same measurement and evaluation as in Example 1 were performed on the obtained moisture-permeable composite sheet. Table 3 shows the results. The fibers are ordinary fibers having a circular cross section.

[0086]

[Table 1]

[0087]

[Table 2]

[0088]

[Table 3]

As is clear from the results shown in Table 3, a stretchable elastic nonwoven fabric made of a composite fiber having a hard elastic component made of crystalline polypropylene as the first component and a thermoplastic elastomer as the second component is formed from a moisture permeable elastomer. The moisture-permeable composite sheets (Examples 1 to 12) of the present invention, which are laminated on the non-porous sheet, have high elasticity and excellent texture. On the other hand, the moisture-permeable composite sheets of Comparative Examples 1 to 3 are sticky and have a poor feel.

Examples 13 to 16 and Comparative Examples 4 to 7 Using the moisture-permeable composite sheet obtained in Example 1 as a back sheet, a disposable diaper shown in FIG. 2 was manufactured (Example 1
3). Similarly, the moisture-permeable composite sheet is used as a stretchable side panel to produce the pants-type disposable diaper shown in FIG. 3 (Example 14), and as the back sheet to produce the disposable diaper shown in FIG. 5 (Example 15). Then, the expandable disposable diaper shown in 7 was manufactured by using it as a stretchable part (Example 16). Further, instead of the moisture-permeable composite sheet used in Examples 13 to 16, the moisture-permeable composite sheet obtained in Comparative Example 1 was used to produce disposable diapers corresponding to Examples 13 to 16 (comparative). Examples 4-7). With respect to these disposable diapers, a test on a feeling of wearing was performed on 10 monitors. As a result, Examples 13 to 1
The disposable diapers of 6 (invention) had stuffiness prevented, were excellent in texture, and had a good wearing feeling, whereas the disposable diapers of Comparative Examples 4 to 73 had a bad touch and were inferior in wearing feeling. Met.

[0091]

According to the present invention, it is possible to obtain a moisture-permeable composite sheet having a high stretchability and an excellent cloth-like texture. In addition, the absorbent article using the moisture-permeable composite sheet as the back sheet has stuffiness prevented, an excellent texture, and a comfortable wearing feeling.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the structure of a preferred embodiment of a moisture-permeable composite sheet of the present invention.

FIG. 2 is a perspective view showing a disposable diaper as an example of an absorbent article using the laminated composite sheet of the embodiment shown in FIG.

FIG. 3 is a perspective view showing a pants-type disposable diaper using the laminated composite sheet of the embodiment shown in FIG.

FIG. 4 is a partially cutaway development view of the pants-type disposable diaper shown in FIG.

FIG. 5 is a perspective view showing another embodiment of the pants-type disposable diaper.

6 (a) is a partially cutaway development view of the pants-type disposable diaper shown in FIG. 5 before assembly, as seen from the top sheet side, and FIG. 6 (b) is FIG. 6 (a). A-A in
It is a line sectional view.

7 is a front view showing a deployable disposable diaper using the moisture-permeable composite sheet of the embodiment shown in FIG. 1. FIG.

8 is a development view of the development-type disposable diaper shown in FIG. 7. FIG.

9 is a development view showing another embodiment of the development-type disposable diaper shown in FIG. 8. FIG.

[Explanation of Codes] 1 breathable composite sheet 2 stretch elastic nonwoven fabric 3 non-porous sheet 10 disposable diaper 11 liquid permeable top sheet 12 liquid impermeable back sheet 20, 20 'stretchable side panel 40a, 40b flap 100 pants Type disposable diaper 200 Expandable disposable diaper

Continuation of the front page (51) Int.Cl. ⁶ Identification code Reference number within the agency FI Technical display location B32B 5/02 B32B 27/36 27/00 27/40 27/12 D01F 8/04 Z 27/36 D04H 3 / 00 C 27/40 3/03 A D01F 8/04 A41B 13/02 F D04H 3/00 H 3/03 A61F 13/18 320 D06M 17/00 D06M 17/00 Z (72) Inventor Yoshihiro Sakai Haga Tochigi 2606 Akabane, Kaimachi, Gunma Kao Institute of Stock Research

Claims (10)

[Claims] 1. A stretchable elastic nonwoven fabric made of stretchable elastic composite fibers containing a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component is laminated on a non-porous sheet made of a moisture permeable elastomer. A moisture-permeable composite sheet characterized by being formed. 2. The moisture-permeable composite sheet according to claim 1, wherein the moisture-permeable elastomer comprises a urethane-based elastomer or an ester-based elastomer. 3. A moisture vapor transmission rate of 0.5 g / [100 cm ² · h
r] or more and the water pressure resistance is 50 cm or more, The moisture-permeable composite sheet according to claim 1 or 2. 4. The moisture-permeable composite sheet according to claim 1, wherein the elastic elastic nonwoven fabric contains 30% by weight or more of the elastic elastic composite fiber. 5. The first of the stretchable elastic composite fibers
The moisture-permeable composite sheet according to any one of claims 1 to 4, wherein the content of the component is 5 to 70% by weight and the content of the second component is 95 to 30% by weight. 6. The stretchable elastic nonwoven fabric according to claim 1, wherein the stretchable elastic nonwoven fabric has a stretch recovery rate of 40 to 100% when stretched by 20%. 7. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber interposed between these sheets, wherein the back sheet is a crystal. Breathable composite sheet obtained by laminating a stretchable elastic nonwoven fabric made of stretchable elastic composite fibers having a hard elastic component made of water-soluble polypropylene as a first component and a thermoplastic elastomer as a second component on a non-porous sheet made of a breathable elastomer. An absorbent article characterized by using. 8. A main body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber interposed between these sheets, and a pair of elastic side panels, The stretchable side panels of are respectively disposed between the waist opening and the pair of leg openings, and the waist opening and the pair of leg openings include:
In a pants-type disposable diaper in which elastic members that form gathers are provided on the respective peripheral portions thereof, in the elastic side panel, a hard elastic component made of crystalline polypropylene is used as a first component and a thermoplastic elastomer is used as a second component. A pants-type disposable diaper characterized by using a breathable composite sheet obtained by laminating a stretchable elastic nonwoven fabric made of stretchable elastic composite fiber as a component on a non-porous sheet made of a breathable elastomer. 9. An abdominal side having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber interposed between these sheets, which is located on the abdomen of the wearer during use. In a deployable disposable diaper in which a back portion located on the back portion and a back portion is formed, flaps are continuously provided on both left and right edges of the back portion, and at least one of the left and right flaps is provided. One end is provided with a flap fastening portion, and the flap fastening portion allows the left and right flaps to be fastened on the abdominal side of the wearer. The portion is provided with diaper fastening portions on both left and right sides thereof, and the diaper fastening portion is brought into contact with the flap so that the diaper can be fastened, and the flap is at least the base thereof. Has an elastic part on the end side In the stretchable portion, a stretchable elastic nonwoven fabric made of stretchable elastic composite fibers having a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component is formed on a non-porous sheet made of a moisture permeable elastomer. An expandable disposable diaper characterized by comprising a moisture-permeable composite sheet that is laminated. 10. A liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorber, wherein a waist opening and a pair of leg openings are formed, and the waist opening is formed. In the underpants type disposable diaper, the elastic member that forms a gather that is substantially continuous over the entire circumference of the peripheral portion and the pair of leg openings is provided. A moisture-permeable composite sheet obtained by laminating an elastic elastic nonwoven fabric made of elastic elastic composite fibers having a hard elastic component as a first component and a thermoplastic elastomer as a second component on a non-porous sheet made of a moisture-permeable elastomer. A pants-type disposable diaper characterized by being used.