JPH09285484A - Shorts type throw-away diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a throw-away diaper having the excellent touch and hand and a comfortable feel to wear by using sheets including stretch elastic non- woven fabrics made of hard elastic consisting of crystalline polypropylene and thermoplastic elastomer as components for stretchable side panels. SOLUTION: The stretchable panels 20, 20' consist of the sheets including the stretch elastic non-woven fabrics consisting of stretch elastic composite fibers (composite fibers) of a two-component system contg. the hard elastic consisting of the crystalline polypropylene as a first component and the thermoplastic elastomer as a second component. The content of the first component in the composite fibers is preferably 5 to 70wt.% and the content of the second component is 95 to 30wt.%. In the case of blending with another fiber, the stretch elastic non-woven fabrics contain preferably >=30wt.% composite fibers. The stretch elastic non-woven fabrics are obtd. by fusing the interlinkage points of the fibers of a web to each other by a heat treatment at the temp. between the m. p. of the first component and the m. p. of the second component, thereby forming many adhesive points.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pants-type disposable diaper for infants, incontinent persons, and adults.

[0002]

2. Description of the Related Art Pants-type disposable diapers are characterized in that they can be raised and lowered by the wearer like ordinary underwear, as compared with flat type (expandable) disposable diapers. However, in order to prevent the wearer from leaking excrement and to be able to wear it easily, the pants-type disposable diaper is required to have a good fit property. It is required to have sufficient followability even for various activities. In order to meet such demands, there has been proposed a pants-type disposable diaper in which a stretchable side panel is provided on a side portion of the main body of the pants-type disposable diaper which is bonded to the abdominal portion and the back portion.

A stretchable nonwoven fabric or the like is generally used as the material of the side panel. The above-mentioned non-woven fabric is generally produced from elastic fibers obtained by processing a thermoplastic elastomer into a fibrous shape. However, only the direct sheet method can be used for the production method, and the production method is limited. Moreover, the stretchable non-woven fabric produced by the direct sheet method has a soft touch peculiar to rubber.

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 pants-type disposable diaper which is excellent in touch and feel and has a comfortable wearing feeling.

[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 using a sheet containing a stretchable elastic nonwoven fabric used as a constituent fiber as a stretchable side panel.

The present invention has been made on the basis of the above findings, and includes a liquid-permeable top sheet, a liquid-impermeable back sheet,
And a main body having a liquid-retaining absorber interposed between these sheets and a pair of elastic side panels, wherein the pair of elastic side panels are respectively provided between the waist opening and the pair of leg openings. In the pants-type disposable diaper in which the waist opening and the pair of leg openings are each provided with an elastic member that forms a gather, in the waist opening and the pair of the leg openings, as the elastic side panel, To provide a pants-type disposable diaper characterized by using a sheet containing 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. Thus, the above object is achieved.

[0009]

The pants-type disposable diaper according to the present invention has stretchable side panels, and since the stretchable side panels are made of a sheet containing a stretchable elastic nonwoven fabric having a cloth-like feel, it is excellent in touch and feel and comfortable. It has a feeling of wearing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the pants-type disposable diaper of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a perspective view showing a preferred embodiment of the pants-type disposable diaper of the present invention, and FIG.
It is a partially broken development view of the disposable diaper shown in FIG.

The pants-type disposable diaper 1 of this embodiment shown in FIGS. 1 and 2 has a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and a liquid-retaining property interposed between these sheets. A main body 10 having an absorber 13 is provided. The body 10 is divided into an abdomen C located on the abdomen of the wearer, a back A located on the back, and a crotch part B when worn. The absorber 13 has a rectangular shape, and the top sheet 11 and the back sheet 1 are
It is clamped and fixed by 2 and.

Elastic side panels 20 and 20 'are joined and fixed to the left and right side edges of the ventral side portion C and the back side portion A, respectively. The joining and fixing of the side edge portions and the stretchable side panels 20, 20 'can be performed by heat sealing, ultrasonic sealing, sealing with an adhesive, or any other suitable means.

Elastic side panels 20 on the ventral side C,
20 and the elastic side panels 20 ', 2 of the back side A
0 ′ respectively contact the surface sheet side of the elastic side panel 20 and the surface sheet side of the elastic side panel 20 ′ to form a seal portion 31, and the seal portion 3
It is joined and fixed via 1. As a result, the waist opening 15 and the pair of left and right leg openings 17 and 17 'are formed. That is, the elastic side panels 20, 2
0'is one elastic side panel which is joined and fixed by the sealing portion 31 to be integrated, and the elastic side panel is arranged between the waist opening and the pair of leg openings. There is. The joining and fixing in the seal portion 31 can be performed by heat sealing, ultrasonic sealing, sealing with an adhesive, or any other suitable means.

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 parallel to the edge of the waist opening, that is, the front and rear waist portions 14, 14'. In the waistline portion E, which is located around the wearer's waistline when worn, four thread-shaped waistline elastic members 21 and 21 'are provided in each of the abdominal portion C and the dorsal portion A, and the front and rear waist portions 1 are provided.
It is arranged in parallel with 4, 14 'so as to be sandwiched between the back sheet 12 and the absorber 13. The waist elastic members 21 and 21 'and the waist elastic member 2
By the arrangement of 3,23 ', the ventral side portion C
And the back side part A is the outer peripheral surface of the part which abuts on the waist and waist of the wearer in the pants-type disposable diaper 1 via the elastic side panels 20 and 20 '(the waist opening vicinity D and the waist part E). Main back sheet 1
2), gathers are formed.

Leg elastic members 22 and 22 'are disposed on both left and right sides of the main body, and the pair of leg opening portions 1 are formed by the elastic elastic members 22 and 22'.
Gathers are formed on the peripheral portions of 7, 17 'so that they can fit in the crotch region.

Further, as shown in FIGS. 1 and 2, the back sheet 12 is provided on the back side portion A at a substantially central portion thereof.
A disposal tape 30 is provided on the surface of the. By using the disposal tape 30, after the bowel movement or the like, the diaper body can be rolled and stopped compactly with the disposal tape 30 to be discarded, so that the bowel movement can be confined in the diaper body and treated hygienically. And it is easy to dispose.

Next, materials and the like of each component of the pants-type disposable diaper of this embodiment will be described. The surface sheet 11 is preferably a liquid-permeable sheet that allows excrement to permeate into the absorbent body 13 and has a feeling close to that of underwear. Examples of such a liquid-permeable sheet include woven cloth, nonwoven cloth, and porous material. A film or the like is used.

As the back sheet 12, a liquid-impermeable and vapor-permeable film sheet obtained by adding a filler to a thermoplastic resin and stretching, or a laminate of a fiber assembly and the film sheet is used.

The absorbent body 13 is preferably composed of defibrated pulp as a main material and a high-molecular water-absorbing polymer in combination. The high-molecular water-absorbing polymer is an upper layer of the absorber 13,
It may be present in any position of the middle layer and the lower layer, or may be a mixture with pulp. The high molecular weight water-absorbing polymer is preferably in the form of particles having a holding performance capable of absorbing and holding a liquid 20 times or more its own weight and having a gelling property. Examples of such a high-molecular water-absorbing polymer include starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethyl cellulose cross-linked product.
Acrylic acid (salt) polymers and the like are preferable.

The waist elastic members 23, 23 ', the waist elastic members 21, 21', and the leg elastic members 2
2, 22 'include natural rubber, synthetic rubber,
An elastic body such as a thread-shaped, band-shaped, or film-shaped foam made of an ethylene-α-olefin copolymer elastomer produced by using a polyurethane or a metallocene catalyst can be used without particular limitation.

As the discarding tape 30, an ordinary tape material coated with an adhesive material is preferably used.
The pressure-sensitive adhesive may be an ordinary pressure-sensitive adhesive such as styrene-
A hot-melt resin or emulsion of a butadiene block copolymer, a styrene-isoprene block copolymer, an acrylic ester, an acrylic copolymer, vinyl acetate, an ethylene-vinyl acetate copolymer, etc. is used.

The characteristic parts of the pants-type disposable diaper 1 of the present embodiment will be described. The elastic side panels 20 and 20 'described above have a hard elastic component made of crystalline polypropylene as the first component and are thermoplastic. The sheet includes a stretchable elastic nonwoven fabric made of a two-component stretchable elastic composite fiber (hereinafter simply referred to as “composite fiber”) having an elastomer as a second component. 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. Further, the stretchable elastic nonwoven fabric containing the composite fiber as a constituent fiber has a cloth-like feel like an ordinary nonwoven fabric and is excellent in texture. Therefore,
The pants-type disposable diaper 1 using the sheet containing the elastic elastic nonwoven fabric as the elastic side panels 20 and 20 ′ has a comfortable wearing feeling.

The hard elastic component used as the first component of the composite fiber forming the stretchable elastic nonwoven fabric is made of 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 above-mentioned 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 which constitutes the stretchable elastic nonwoven fabric comprises a thermoplastic elastomer. The thermoplastic elastomer generally comprises a flexible component (soft segment, soft phase) having rubber elasticity in the molecule and a molecular constraining component (hard segment, soft segment) for preventing plastic deformation.
(Hard phase). The thermoplastic elastomer can be classified according to the type of the hard segment, and in the present invention, a styrene elastomer, an olefin elastomer, a vinyl chloride elastomer,
Urethane elastomer, ester elastomer, amide elastomer, syndiotactic poly (1,2
-Butadiene) and poly (trans-1,4-isoprene) can be preferably used. Among these thermoplastic elastomers, urethane-based elastomers and ester-based elastomers can be particularly preferably used.

As the urethane elastomer preferably used, 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 processability, cost, light resistance, chemical resistance, skin irritation, etc., 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 thermoplastic elastomer has 100 parts thereof.
It is preferable that the stretch recovery rate at the time of% stretch is 50% or more because the stretchable side panel can follow the movement of the human body without causing damage.

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 above-mentioned composite fiber is not particularly limited in its fiber form as long as it is a fiber form capable of exhibiting stretch elasticity. As a preferable fiber form of the composite fiber, a parallel type (side
By-side type), split type (fiber cross section divided into arcs), sheath-core type [sheath-core type (concentric circle type and eccentric type)] and the like. The conjugate fiber in these fiber forms 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 conjugate fiber produced by the above-mentioned known spinning method may be directly made 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 fiber diameter of the above conjugate fiber is preferably 1 to 20 denier, and more preferably 2 to 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 above-mentioned conjugate fiber preferably has an elongation recovery rate of 20 to 100% at 100% elongation,
It is more preferably -100%. If the extension recovery rate is less than 20%, the function of the elastic side panel to follow the movement of the human body may be insufficient.

The above-mentioned composite fiber may be used in the form of staple fiber such as staple fiber or in the form of continuous fiber such as continuous filament.

The stretchable elastic nonwoven fabric is the above-mentioned composite fiber 10
It is particularly preferable that it is composed of 0%, but it may be mixed with other fibers. When the above conjugate fiber is mixed with another fiber, the stretchable elastic nonwoven fabric preferably contains 30 wt% or more, more preferably 50 wt% or more of the conjugate fiber. If the amount of the composite fiber is less than 30% by weight, the elastic elasticity of the elastic elastic nonwoven fabric may be remarkably lowered and 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 can be produced by, for example, a method using a card machine or a direct sheet method, and specifically, a nonwoven fabric such as a resin bond, a blend of binder fibers, a heat roll, and a watery drink. It can be manufactured by a manufacturing method. In particular, the stretchable elastic nonwoven fabric forms a web composed of the composite fibers (or includes the composite fibers) by using a known web forming method, and then, between the entanglement points of the fibers in the web, the first component It is preferably produced by heat-bonding at a temperature between the melting point 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 bonding 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 during 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 preferably has a stretch recovery rate of 40 to 100% when stretched by 20%,
It is more preferably 60 to 100%. If the extension recovery rate is less than 40%, the stretchable side panel may not sufficiently follow the movement of the human body and the resistance may increase.

The stretchable elastic nonwoven fabric has a basis weight of 5 to 2
It is preferably 00 g / m ² and 15 to 80 g / m
More preferably, it is ² . If the basis weight is less than 5 g / m ² , the elongation 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, which is disadvantageous in terms of cost. Therefore, it is preferably within the above range.

The stretchable elastic nonwoven fabric has 0.5
The thickness under g / cm ² loading 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 mm, the elastic side panel is practically
It is preferable to set it within the above range because it gives a feeling of strangeness.

In the pants-type disposable diaper of the present invention, even if the elastic side panel is composed of a sheet made of only the elastic elastic nonwoven fabric, the effect of the present invention is sufficiently exhibited. As a side panel,
The effect of the present invention is sufficiently exhibited even if a laminated sheet in which the elastic elastic nonwoven fabric is laminated with another elastic material, for example, a thermoplastic elastomer film. The use of such a laminated sheet is preferable because the stretchable physical properties of the stretchable side panel can be freely controlled.
As a laminated form of the thermoplastic elastomer film and the elastic elastic nonwoven fabric, for example, a form in which the thermoplastic elastomer film is laminated on one surface of the elastic elastic nonwoven fabric, a laminate of the thermoplastic elastomer film on both surfaces of the elastic elastic nonwoven fabric. And a form in which the stretchable elastic nonwoven fabric is laminated on both surfaces of the thermoplastic elastomer film. Examples of the material forming the thermoplastic elastomer film include urethane, styrene, ester, and olefin-based thermoplastic elastomers, and in particular, ethylene-α-olefin copolymers produced by using metallocene as a catalyst. It is preferably used.

The pants-type disposable diaper of the present invention has been described above based on its preferred embodiment. However, the pants-type disposable diaper of the present invention is not limited to the above-mentioned embodiment, and other modifications are possible. For example, the stretchable side panel may be joined and fixed only to the left and right side edge portions of either the back side portion A or the abdominal side portion C. Also,
The stretchable side panel may be made of a sheet containing only the stretchable elastic nonwoven fabric, which is bonded and fixed to any one of the back side portion and the abdominal side portion. Also,
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 a sheet containing the stretchable elastic nonwoven fabric are arranged in multiple rows and alternately. . In addition, the elastic side panel 2
The joint fixation of 0 and 20 ′ is not limited to a position corresponding to the side of the wearer's body, and may be a position closer to the ventral side or the back side of the wearer's body.

[0047]

EXAMPLES The effectiveness of the pants-type disposable diaper of the present invention will be illustrated below with examples. However, the scope of the invention is not limited to such examples.

Production Example 1 Production of Composite Fiber Polypropylene (melt index; as the first component)
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. 75%, the basis weight was 32 g / m ² , and the thickness under load of 0.5 g / cm ² was 0.8 mm. In addition, the texture of this stretchable elastic nonwoven fabric was evaluated. The results are shown in Table 2. The method of measuring the elongation recovery rate of the second component and the conjugate fiber at 100% elongation, and the elongation recovery rate of the stretchable elastic nonwoven fabric at 20% elongation and the evaluation method of texture are as follows.

<Extension Recovery Ratio of Second Component and Composite Fiber at 100% Elongation> 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%. This state is maintained for 1 minute, then returning is started at a speed of 300 mm / min, and the length when the stress becomes 0 is measured. 20%
The extension recovery rate (%) during extension is calculated from the following formula. Extension recovery rate (%) at 20% extension = (initial length / length after extension recovery) × 100 <Handle of elastic elastic nonwoven fabric> Ten panelists evaluated the touch. 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".

[Production Examples 2 to 12] Composite fibers were produced by the same procedure as in Production 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 the same procedure as in Production Example 1 using the obtained conjugate fiber. The stretchable elastic nonwoven fabric thus obtained was measured and evaluated in the same manner as in Production Example 1. The results are shown in Table 2.
Shown in

[Comparative Production 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 nonwoven fabric thus obtained was measured and evaluated in the same manner as in Production Example 1. The results are shown in Table 2. The fibers are ordinary fibers having a circular cross section.

[0053]

[Table 1]

[0054]

[Table 2]

As is clear from the results shown in Table 2, a stretchable elastic nonwoven fabric (manufacturing examples 1 to 12) made of composite fibers having a hard elastic component made of crystalline polypropylene as a first component and a thermoplastic elastomer as a second component. ) Is
It is highly stretchable and has an excellent texture. On the other hand, the non-woven fabrics of Comparative Production Examples 1 to 3 have a poor texture and are unsuitable for use in direct contact with the skin.

[Examples 1 to 12 and Comparative Examples 1 to 3] The stretchable elastic nonwoven fabrics obtained in Production Examples 1 to 12 were used as stretchable side panels to produce the pants-type disposable diaper shown in Fig. 1 ( Examples 1-12). Similarly, the non-woven fabrics obtained in Comparative Production Examples 1 to 3 were used as stretchable side panels to produce pants-type disposable diapers shown in FIG. 1 (Comparative Examples 1 to 3). With respect to these pants-type disposable diapers, 10 monitors were tested for fit. As a result, the pants-type disposable diapers of Examples 1 to 12 (invention) had good touch, texture and wearing feeling, whereas the pants-type disposable diapers of Comparative Examples 1 to 3 had poor touch. It was inferior to the wearing feeling.

[0057]

The pants-type disposable diaper of the present invention has a stretchable side panel made of a sheet containing a stretchable elastic nonwoven fabric having a cloth-like feel, so that it is excellent in touch and feel and has a comfortable wearing feeling. . In addition, it has excellent fit around the waist and prevention of slipping off, and excellent leakproofness of excrement. Furthermore, it is easy to attach and detach diapers to infants etc. while sitting or standing. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a pants-type disposable diaper of the present invention.

FIG. 2 is a partially cutaway exploded view of the disposable diaper shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 11 Top sheet 12 Back sheet 13 Absorber 14 Waist in front 14 Waist after 14 'Waist opening 17 Leg opening 20 Elastic side panel 21 Waist elastic member 22 Leg elastic member 23 Waist Elastic member 30 waste tape 31 seal part A back part B crotch part C ventral part D near waist opening E girth part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taeko Kanai 2606 Akabane Kai, Cho, Haga-gun, Tochigi Prefecture Kao Stock Company Research Institute (72) Yoshihiro Sakai 2606 Akaba, Kai-cho, Haga-gun, Tochigi Research Institute, Kao Stock Company

Claims (6)

[Claims] 1. 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 stretchable 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 forming gathers are provided on the respective peripheral portions thereof, in the elastic side panel, the hard elastic component made of crystalline polypropylene is the first component, and the thermoplastic elastomer is the second component. A pants-type disposable diaper characterized by using a sheet containing a stretchable elastic nonwoven fabric composed of stretchable elastic composite fibers as a component. 2. The pants-type disposable diaper according to claim 1, wherein the stretchable elastic nonwoven fabric is obtained by fusing the entanglement points of the stretchable elastic composite fiber to form a large number of bonding points. 3. The pants-type disposable diaper according to claim 1, wherein the elastic elastic nonwoven fabric contains 30% by weight or more of the elastic elastic composite fiber. 4. The first of the stretchable elastic composite fibers
The pants-type disposable diaper according to claim 1, 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. 5. The pants-type disposable diaper according to claim 1, wherein the stretch elastic nonwoven fabric has a stretch recovery rate of 40 to 100% when stretched by 20%. 6. The sheet according to claim 1, which is a laminated sheet of an elastomer film and the stretchable elastic nonwoven fabric.
The pants-type disposable diaper according to any one of 5 above.