JP2003220660A - Absorptive article with nonwoven fabric and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive article with a nonwoven fabric which exhibits high pliability, entire planar uniformity, satisfactory surface smoothness and soft and comfortable touch. <P>SOLUTION: At least two layers of a spun bonded fabric layer formed of a web by a spun bonding process and a melt-blown process, both based on a raw material extruded with a flexibilizer added in a raw material stage prior to melting/extrusion, are laminated over each other to obtain a nonwoven fabric laminate. This laminate is used as an absorptive article by positioning the spun bonded fabric layer at the outer face of the absorptive article. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an absorbent article having a nonwoven fabric and a method for manufacturing the same. In particular, it relates to improvement of a non-woven fabric as a material for absorbent articles such as disposable paper diapers and sanitary napkins, which are required to have good touch.

[0002]

2. Description of the Related Art Nonwoven fabrics have excellent porosity, bulkiness, absorbability, water permeability (liquid permeability), etc. due to their structure, and their necessary properties can be freely changed. It is commonly used. In recent years, in addition to a single-layer non-woven fabric, a laminated non-woven fabric in which two or more layers are laminated is used to obtain desired properties.

[0003]

However, conventional laminated non-woven fabrics such as SMS, SMMS, SSMMS.
(S means a non-woven fabric layer by the spunbond method, M means a non-woven fabric layer by the melt blown method) is hard and gives a rough feel due to a large friction, and therefore a good feel is required even for a sensitive wearer. It was not always satisfactory for use as a material for absorbent articles. Also, uniform smoothness over the entire surface,
Where softness is required, it is not always satisfactory, and improvement thereof has been desired.

Therefore, a main object of the present invention is to provide an absorbent article which is rich in flexibility, has uniform and good smoothness and softness over the entire surface, and has an excellent tactile sensation, and a method for producing the same. is there.

[0005]

The present invention, which has solved the above-mentioned problems, is as follows. <Invention of Claim 1> A spunbonded nonwoven fabric layer having a web formed by a spunbond method, and a meltblown nonwoven fabric layer having a web formed by a meltblown method are prepared from an extruded raw material mixed with a softening agent at a raw material stage before melt extrusion. An absorbent article having a nonwoven fabric, wherein a nonwoven fabric laminate having two or more layers laminated is put in a state in which the spunbonded nonwoven fabric layer is positioned on the outer surface of the absorbent article for use.

(Function and effect) Spunbond nonwoven fabric (S)
Is a continuous filament, has no fluff, is excellent in touch, and is suitable for giving smoothness. The meltblown nonwoven fabric (M) is a discontinuous fiber and is suitable for imparting flexibility. However, as described above, even if these laminated non-woven fabrics are used, they are hard and give a rough touch due to large friction, and therefore a material for an absorbent article that is required to have a good feel even to a sensitive wearer. It was not always satisfactory to use as.
Further, even smoothness and softness are required over the entire surface, which is not always satisfactory, and improvement thereof has been desired. From the viewpoint of imparting flexibility, to the surface of the laminated nonwoven fabric, or to the whole,
It is possible to improve by applying a softening agent by coating or impregnation, but the effect is not fully exerted with a small amount of application, and if applied excessively, it will give an excessive "slimy" feeling, and it will be soft. It is difficult to strike a balance between flexibility and smoothness. Moreover, when manufacturing an absorbent article, the non-woven fabric is usually assembled by bonding with a hot melt adhesive, but it has been found that the presence of a softening agent causes a decrease in the adhesive strength of the hot melt adhesive. In particular, in order to form a gather part using an elastic stretchable member such as rubber thread, when the nonwoven fabric is used as a gather sheet and the nonwoven fabric is to be bonded to the elastic stretchable member or the facing nonwoven fabric, a softener Due to the decrease in adhesion due to the presence,
It has been found that the elastic stretchable member cannot be fixed to a predetermined site, and the elastic stretchable member arranged at the predetermined site is pulled in. Furthermore, it was also found that uneven distribution of the softening agent in the surface direction causes unevenness in flexibility. However, in the present invention,
When obtaining a spunbonded nonwoven fabric layer on which a web is formed by the spunbond method, the softening agent is mixed in at the raw material stage before melt extrusion. First, the effect of mixing the softening agent is uniform over the entire spunbonded nonwoven fabric layer. In addition to exhibiting excellent softness, it exhibits uniform and good smoothness and softness over the entire surface, and exhibits excellent tactile sensation. Secondly, since it is sufficient to modify only the surface layer, it is easy to balance flexibility and smoothness without giving an excessive "slick" feeling. Thirdly, in the case of manufacturing an absorbent article, when the non-woven fabric laminate is adhered to another material by a hot-melt adhesive, the non-woven fabric layer on the adhering side is not mixed with a softening agent, The nonwoven fabric laminate and the elastic member or the facing nonwoven fabric can be reliably bonded.

<Invention of Claim 2> An absorbent article having a nonwoven fabric according to claim 1, wherein the content of the softening agent in the nonwoven fabric laminate is 0.5 to 3.0% by mass.

(Effect) If the softening agent content is small,
Insufficient modification of softness and smoothness and an excessive amount give a feeling of "slickness" and further decrease the adhesive strength of the hot melt adhesive.

<Invention of Claim 3> The non-woven fabric laminate is adhered to another material by a hot-melt adhesive, and the non-woven fabric layer on the adhering side is not mixed with a softening agent. An absorbent article having:

(Function and Effect) The third function and effect are exhibited.

<Invention of Claim 4> The surface characteristics of the spunbonded nonwoven fabric layer in the nonwoven fabric laminate by the KES system satisfy the following conditions (1) and (2). Nonwoven fabric according to item. (1) Average friction coefficient (MIU): MD is 0.01 to 1.
40, CD 0.01 to 1.50 (2) Average deviation of friction coefficient (MMD): MD 0.01
~ 1.00, CD 0.01 ~ 1.30

(Operation and Effect) The absorbent having the above characteristics is excellent as an absorbent article.

<Invention according to Claim 5> The nonwoven fabric according to any one of Claims 1 to 4, wherein the bending characteristics of the nonwoven fabric laminate by the KES system satisfy the following conditions (1) and (2). . (1) Bending rigidity (B): MD is 0.001 to 0.004
g · cm ² / cm, CD 0.001 to 0.020 g ·
cm ² / cm ⁽²⁾ hysteresis width (2HB): MD is 0.001
0.002g-cm / cm, CD 0.001-0.0
10 g / cm / cm

(Function and Effect) The absorbent having the above characteristics is excellent as an absorbent article.

<Invention of Claim 6> A spunbonded nonwoven fabric layer having a web formed by a spunbond method, and a meltblown nonwoven fabric having a web formed by a meltblown method, using an extruding raw material mixed with a softening agent at a raw material stage before melt extrusion. A method for producing an absorbent article having a nonwoven fabric, comprising: obtaining a nonwoven fabric laminate in which two or more layers are laminated, and incorporating the nonwoven fabric laminate so that the spunbonded nonwoven fabric layer is located on the outer surface of the absorbent article. .

(Operation effect) An absorbent article having the operation effect described in claim 1 can be obtained.

<Invention of Claim 7> The non-woven fabric laminate is incorporated by bonding it to another material with a hot-melt adhesive, and the non-woven fabric layer on the adhering side is not mixed with a softening agent. The manufacturing method of the absorbent article which has the nonwoven fabric of Claim 6 which uses.

(Operation and effect) The operation and effect according to claim 2 can be obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below. <Nonwoven fabric and laminate thereof> The present invention relates to a spunbonded nonwoven fabric (S) layer having a web formed by a spunbond method;
A nonwoven fabric laminate in which two or more layers of a meltblown nonwoven fabric layer (M) having a web formed by a meltblown method are laminated is used as a material for an absorbent article.

In the production of the spunbonded nonwoven fabric of the present invention, for example, a raw material polymer is melted by an extruder or the like and discharged from a spinning wire having a spinning nozzle to spin long fibers.
The spun filament is cooled with a cooling fluid, and tension is applied to the long fibers by drawing air to obtain a predetermined fineness, and the filament is collected as it is on a collecting belt to be deposited to a predetermined thickness and then bonded. . In this case, in addition to heat-sealing the filaments with each other's own heat, a method of entanglement by another bonding method such as needle punching method, water jet (spunlace method), ultrasonic sealing, or the like, or It can be adhered by a method such as a heat fusion method (calender method or air through method) using a hot embossing roll.

The spunbonded non-woven fabric may be composed of a core-sheath type composite fiber as a fibrous material. In this case, a polymer such as an ethylene polymer forming a core and a heavy polymer such as a crystalline propylene forming a sheath. The coalesce and the melt are separately melted by an extruder or the like, and each melt is discharged from a spinning wire having a composite spinning nozzle configured to discharge a desired core-sheath structure to form a core-sheath type. The composite long fibers of are spun. The treatment after spinning may be the same as above. The core-sheath type composite fiber has a fineness of 5d or less, and is preferably 3d or less from the viewpoint that a nonwoven fabric having more excellent flexibility can be obtained.
Here, a core-sheath type composite fiber means a concentric type in which a circular core part is wrapped in a donut-shaped sheath part having the same core in the fiber cross section, and the core part and the core part are misaligned and It has an eccentric type in which a portion is wrapped in a sheath portion, or a parallel type in which an eccentric core portion is not wrapped in a sheath portion.

On the other hand, the melt-blown nonwoven fabric of the present invention can be produced by a conventionally known method. For example, melt extrusion of a raw material polymer such as crystalline propylene,
The fibers spun from the melt-blow spinneret can be blow-spun as a fine fiber stream by a high-temperature, high-speed gas to form a fine fiber web on a collecting device such as a wire net or a belt, and the fine fiber web can be manufactured through the above-mentioned bonding step. The average fiber diameter of the fibers forming the meltblown nonwoven fabric is usually 1 to 3.
It is about 0 μm, preferably about 2 to 10 μm.

The basis weight of the nonwoven fabric of the present invention, for the spunbonded nonwoven fabric, usually 3~100g / m ^2, and preferably 7~30 g / m ^2. Regarding the melt blown nonwoven fabric, it is usually 1 to 50 g / m ² , and preferably 3 to
It is 30 g / m ² . The basis weight may be appropriately determined according to the application.

The nonwoven fabric laminate in the present invention is a laminate of spunbonded nonwoven fabric (S) and meltblown nonwoven fabric (M), and is a spunbonded nonwoven fabric layer / meltblown which is an S layer composed of at least one set of spunbonded nonwoven fabrics. The nonwoven fabric laminate having the SM structure of the nonwoven fabric layer shows excellent flexibility. In addition, spunbonded nonwoven fabric (S) is provided on both sides of at least one layer of meltblown nonwoven fabric (M).
It may be a laminate having a structure in which the layers of That is, it may be a non-woven fabric laminate having an SMS structure of spun-pond non-woven fabric layer / melt-prone non-woven fabric layer / spun-bonded non-woven fabric layer, or the structure may be repeated.
From the viewpoint of the balance of strength and flexibility of the laminate, SM
Nonwoven fabric laminates having S structure, SMMS structure, and SSMMS structure are preferable. The weight of the nonwoven fabric laminate is usually 7 to 100 g
/ M ² , preferably 10 to 70 g / m ² . More preferably, it is 10 to 50 g / m ² .

The laminated body may be obtained by any method as long as the spunbonded nonwoven fabric and the meltblown nonwoven fabric are laminated and integrated to form a laminated body, and there is no particular limitation. For example, fibers formed by the melt blown method are directly deposited on a spun bond nonwoven fabric to form a melt blown nonwoven fabric, and then the spun bond nonwoven fabric and the melt blown nonwoven fabric are heat-sealed together, and the spun bond nonwoven fabric and the melt blown nonwoven fabric are superposed. A method of fusing both nonwoven fabrics by heating and pressing, a method of adhering the spunbonded nonwoven fabric and the meltblown nonwoven fabric with an adhesive such as a hot-melt adhesive or a solvent-based adhesive can be adopted.

The melt-blown non-woven fabric can be directly formed on the spun-bonded non-woven fabric by spraying a melt of a thermoplastic resin on the surface of the spun-bonded non-woven fabric to deposit fibers. At this time, with respect to the spunbonded nonwoven fabric, the surface opposite to the surface on which the melt is sprayed has a negative pressure, and the fibers formed by the meltblown method are sprayed and deposited at the same time as the spunbonded nonwoven fabric and the meltblown nonwoven fabric. Are integrated to obtain a flexible nonwoven fabric laminate having a spunbonded nonwoven fabric layer and a meltblown nonwoven fabric layer. If the two nonwoven fabrics are insufficiently integrated, they can be sufficiently integrated by using a heat and pressure embossing roll or the like.

As a method of fusing the spunbonded nonwoven fabric and the meltblown nonwoven fabric by heat fusion, a method of heatfusing the entire contact surface between the spunbonded nonwoven fabric and the meltblown nonwoven fabric, a spunpond nonwoven fabric and a meltblown nonwoven fabric are used. There is a method of heat-sealing a part of the contact surface.

<Softening Agent> In the present invention, at least the surface of the laminate, which is in direct contact with the skin, comprises a spunbonded nonwoven fabric layer. When forming the spunbonded nonwoven fabric (S) layer, the softening agent is uniformly mixed in the raw material stage before melt extrusion, for example, in the pellet manufacturing stage. This extrusion raw material is melted by the extruder as described above, and the web is formed by the spunbond method. In the case of the SSMMS structure, a softener can be mixed in each SS layer on one side. It is desirable not to mix a softening agent in the meltblown nonwoven fabric layer.

In the present invention, the spunbonded non-woven fabric layer mixed with the softening agent is placed on the outer surface of the absorbent article for use, but the obtained non-woven fabric laminate is treated with a hot melt adhesive to form another The softening agent may or may not be mixed in the non-woven fabric layer on the side to be bonded to the material. If not mixed, the bending hardness remains, so
It is desirable to incorporate a softening agent.

Here, the amount of the softening agent mixed in the nonwoven fabric laminate is preferably 0.5 to 3.0% by mass. The “amount of the softening agent mixed in the nonwoven fabric laminate” in the present invention means the case where the softening agent is mixed only in the spunbonded nonwoven fabric (S) layer on one side and the softening agent in the spunbonded nonwoven fabric (S) layer on both sides. There is a case where they are mixed respectively, but in any case, it means the total mixing amount.

As the softening agent, for example, a wax emulsion, a reactive softening agent, a silicone-based softening agent and the like can be used, but it is preferable to use a surfactant. Examples of the surfactant include a carboxylate-based anionic surfactant, a sulfonate-based anionic surfactant, a sulfate ester-based anionic surfactant, and a phosphate ester-based anionic surfactant (especially alkylphosphorus Acid ester salts) and the like; sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, propylene glycol monostearate, and other polyhydric alcohol monofatty acids, N- (3-oleyloxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate Polyoxyethylene sorbitan sesquistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate,
Nonionic surfactants such as polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether; cationic surfactants such as quaternary ammonium salts, amine salts or amines A zwitterionic surfactant such as an aliphatic derivative of a secondary or tertiary amine containing carboxy, sulfonate or sulfate, or an aliphatic derivative of a heterocyclic secondary or tertiary amine; can do.

If desired, known chemicals can be added to the softener of the present invention as a secondary additive (minor component). Examples of this include saccharides such as sorbitol or glucose or a mixture thereof, flavors, colorants,
Secondary additives such as preservatives and antioxidants can be added.

As the raw material of the non-woven fabric, the same material as the conventional non-woven fabric can be used. For example, one or several kinds of cotton, rayon, polyester, polypropylene, nylon, acrylic, vinylon, glass fiber and the like can be used. It can be appropriately selected and used.

By the way, the non-woven fabric according to the present invention is manufactured by KES
The basic characteristics of the system (Kawabata Evaluation System) are more preferable in terms of smoothness and softness under the following conditions.

1) Surface characteristics: Average friction coefficient (MIU) and average deviation of friction coefficient (MMD) "Friction tester KESSE" manufactured by Kato Tech Co., Ltd. can be used for this surface characteristic test. For the measurement, as shown in Fig. 1, the cross-sectional diameter is 0.5m.
While a friction element made of a piano wire having a length of 5 mm and having a contact surface of 5 mm is brought into contact with the nonwoven fabric sample at a contact pressure of 10 g, a tension of 20 g / cm is applied to the nonwoven fabric sample in the moving direction, The coefficient of friction is measured when the material is moved 2 cm at a speed of 1 cm / sec. Average coefficient of friction (M
MD (Machine Direction) of IU is 0.01-
1.40, CD (Cross Direction) 0.01 to 1.
It is preferably 50. This is because the nonwoven fabric has good smoothness. The mean deviation (MMD) of the friction coefficient is 0.01 to 1.0 for MD and 0.
It is preferably from 01 to 1.3. This is because the non-woven fabric has an improved smoothness by suppressing the variation in smoothness. The average deviation of the friction coefficient (MM
D) is a variation of the surface thickness when the friction element is moved, that is, a coefficient of friction divided by a friction distance (moving distance = 2 cm).

2) Bending characteristics: Bending rigidity (B) and hysteresis (2HB) For this bending characteristic test, "Automated Pure Bending Tester KESFB2-AUTO-A" manufactured by Kato Tech Co., Ltd. was used and shown in FIG. As described above, a non-woven fabric sample having a width of 20 cm is chucked at a distance of 1 cm, and one side is bent to the front side by a pure bending that always keeps an arc to a maximum curvature of 2.5 cm ⁻¹ and then returned to the original position, and then the maximum curvature of −2.5 cm ^This is to evaluate the relationship between the curvature and the bending moment when it is bent back up to ^{-1 and} then returned to its original position. This relationship is obtained as a value on the hysteresis curve shown in FIG. 3, and the curvature is 0.5 to 1.5.
The bending rigidity (B) of the nonwoven fabric represented by the average inclination in the range of cm ⁻¹ has an MD (Machine Direction) of 0.0.
01-0.004g · cm ² / cm, CD (Cross Direc
is preferably 0.001 to 0.020 g · cm ² / cm. This is because the nonwoven fabric has low bending resistance. Further, the bending recovery (2HB) of the nonwoven fabric, which is represented by the average hysteresis width of the bending moment M between the curvatures of 0.5 to 1.5 cm ^-1 , has an MD of 0.
001-0.002g · cm / cm, CD 0.001
It is preferably about 0.010 g · cm / cm. The larger the bending recovery property (2HB), the worse (low) the bending recovery property is. However, when the bending recovery property is within the above range, the nonwoven fabric has an appropriate bending recovery property. Average friction coefficient (M
IU), mean deviation of friction coefficient (MMD), bending rigidity (B), and hysteresis width (2HB) are set within the predetermined ranges, whereby a non-woven fabric having good smoothness and softness is produced.

The surface characteristics can be adjusted mainly by adjusting the mixing amount of the softening agent. The bending characteristics can be adjusted by adjusting the basis weight of the M layer.

<Form Example of Absorbent Article> As an absorbent article of the present invention, a form example of a disposable diaper will be given. That is, this example has a fastening piece attached to both ends of the back side of the paper diaper, and has a hook element on the fastening surface of the fastening piece, and the outer sheet forming the back surface of the paper diaper is made of non-woven fabric. In mounting the diaper, the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the non-woven fabric outer sheet.

A specific example will be described with reference to FIGS. 4 and 5. In the illustrated paper diaper, a liquid-permeable top sheet 1 made of a non-woven fabric and a liquid-impermeable sheet that is substantially impermeable to liquid, such as polyethylene, are used. An absorbent body 3 made of cotton-like pulp or the like having a certain rigidity such as a rectangle or preferably an hourglass shape as shown in the figure is interposed between the impermeable sheet 2 and the impermeable sheet 2. There is. This absorbent body 3 can be covered with upper and lower tissue paper for absorption, and constitutes an absorbent element.

The liquid-impervious sheet 2 has a rectangular shape wider than the absorbent element, and an outer sheet 10 made of an hourglass-shaped non-woven fabric or the like is provided on the outer side thereof.

The liquid-permeable top sheet 1 has a rectangular shape wider than the absorbent element, extends slightly outward from the side edge of the absorbent element, and is fixed to the liquid-impermeable sheet 2 with a hot melt adhesive or the like. (A fixing part including this fixing part and related to the present invention is indicated by a symbol *).

Standing cuffs B for legs are formed on both sides of the diaper so as to project toward the use surface.
Is a standing sheet 4 made of a breathable non-woven fabric which is substantially continuous in the width direction, and an elastic elastic member, for example, one elastic rubber member 5 around the leg made of rubber thread or a plurality of elastic elastic members 5 around the legs as shown. It is configured. 7 is a fastening piece using a surface fastener.

Further, the standing cuffs B are formed by double-folding the standing sheet 4 inwardly in a stepwise manner on the inner surface side, and are wrapped in a state in which each leg elastic elastic member 5 is fixed by a hot melt adhesive or the like. I'm out.

The inner surface of the double standing sheet 4 has a fixing start end at a position separated from the side edge of the liquid-permeable top sheet 1, and a width from the fixing start end to the extending edge of the liquid-impermeable sheet 2. The outer portion in the direction is fixed by a hot melt adhesive or the like. The outer surface of the double standing sheet is fixed to the outer sheet 10 at its lower surface with a hot melt adhesive or the like.

As a result, the inner surface of the double standing sheet 4 is
The starting end of fixing to the liquid-impervious sheet 2 forms the standing end of the standing cuff B. Inside the legs, the inside of this standing end is a free part that is not fixed to the product body,
The product is functionally and conceptually divided into an upright portion that faces the center of the product and a flat contact portion that is turned upside down on the way to the outside and goes outward.

On the other hand, although not shown, at the front and rear ends in the longitudinal direction, the portion corresponding to the standing portion (extension portion of the standing portion) is concretely attached to the product by a hot-melt adhesive or the like in a state of facing the center side of the product. Is fixed to the outer surfaces of the liquid-permeable top sheet 1 and the liquid-impermeable sheet 2, and is fixed on the portion corresponding to the standing portion in a state in which the portion corresponding to the flat surface (extension portion of the flat portion) is folded and inverted. There is.

In addition, at least one elastic expansion / contraction member 5 is basically provided at the flat contact portion, but it is particularly preferable that the elastic expansion / contraction member 5 is provided at the tip end of the flat contact portion. Also, it is preferable to have the elastic stretchable member 5.

The optimum form is that it is located in the vicinity of the rising edge, in the vicinity of the folded portion, and at the tip of the flat contact portion. It is more desirable that the tip end of the flat contact portion has a plurality of tips as shown in the drawing. The standing portion may be further provided with elastic stretchable members 5 and 5 in order to increase the standing force. In the illustrated form, there are a total of six.

In this example, by using a surface fastener as the fastening piece 7, the outer sheet 1 made of a non-woven fabric is used.
It can be mechanically attached to 0. Therefore, the so-called target tape can be omitted, and
The fastening position by the fastening piece 7 can be freely selected.

The fastening piece 7 has a base of a fastening base material such as plastic, poly-laminated nonwoven fabric, paper, etc., which is joined to the outer sheet 10 by an adhesive, for example, and has a hook element 7A on the tip side. The hook element 7A is bonded to the fastening base material with an adhesive. The hook element 7A has a large number of engaging pieces on the outer surface side thereof. The hook element 7A has a temporary fixing adhesive portion 7B on the tip side. At the final stage of assembling the product, the temporary adhesive portion 7B is adhered to the upright sheet 4 to prevent the fastening piece 7 from peeling off on the tip side. At the time of use, it is peeled off against the adhesive force, and the tip side of the fastening piece 7 is brought to the front body. The fastening base material is exposed on the front end side of the temporary adhesive portion 7B to form a knob tab portion.

As shown in FIG. 4, the target print sheet 20 as a design sheet is provided on the inner surface of the outer sheet 10 on the opening side of the front body, and the hook element 7A of the fastening piece 7 is provided. Target printing is performed with a design that serves as a guide for the position where the sheet is fastened, and is provided so as to be visible from the outside through the outer sheet 10.

At the time of wearing the disposable diaper, since the disposable diaper is attached to the body in a boat shape, the elastic elastic members 5, 5 ...
2, the standing cuffs B stand around the legs due to the contracting forces of the elastic expansion / contraction members 5, 5, ... As shown in FIG.

The space surrounded by the standing portion forms a confining space for urine or loose feces. If you urinate in this space,
The urine is absorbed into the absorbent body 3 through the liquid-permeable top sheet 1, and the solid portion of loose stool is prevented by the standing portion of the standing cuff B as a barrier. In the unlikely event that urine leaks sideways beyond the standing distal side edge of the standing portion, the side leak is prevented by the stop function of the flat contact portion.

In this embodiment, the standing sheet 4 forming each standing cuff is preferably not liquid-permeable but substantially liquid-impermeable (may be semi-liquid-permeable). Further, the liquid-permeable sheet (for example, non-woven fabric) forming the upright sheet 4 may be made to have a property of repelling liquid by silicon treatment or the like. In any case, the upright sheet 4 and the outer sheet 10 are both breathable, and
The outer sheet 10 and the outer sheet 10 each have a water pressure resistance of 100 mmH.
A sheet of ₂ O or more, particularly a non-woven fabric is preferable.
As a result, as shown in FIGS. 2 and 3, the side portions in the width direction of the product exhibit breathability, and stuffiness of the wearer can be prevented.

Particularly, by using a non-woven fabric, it is possible to obtain a disposable paper diaper that produces almost no sound during wearing and gives a cloth-like feel. As the material fibers of the non-woven fabric forming the outer sheet 10, the liquid permeable top sheet 1 and the standing sheet 4, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, amides, etc., as well as recycled rayon, cupra, etc. A natural fiber such as a fiber or cotton can be used, and a nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blow method, a needle punch method can be used.

In the above embodiment, the liquid-permeable top sheet 1, the upright sheet 4, and the outer surface sheet 10 are sheets that form the outer surface of the absorbent article. Therefore, the nonwoven fabric laminate according to the present invention can be adopted as these sheet materials. In particular, it is desirable that the non-woven fabric laminate according to the present invention be used on the use surface (the upper surface in FIGS. 2 and 3) that comes into direct contact with the skin.

On the other hand, the non-woven fabric laminate according to the present invention gives good characteristics even when the elastic stretchable member is wrapped or when it is interposed between other elastic sheet members. That is, in a form in which one or a plurality of leg elastic elastic members 5 made of rubber thread are fixed by a hot melt adhesive to wrap the standing sheet 4 to form a three-dimensional gather cuffs, as shown in FIG. An example is the case where the nonwoven fabric laminate according to the present invention is used as the sheet material forming No. 4. In another example, as shown in a modified example of the flap on the right side of FIG. 3, a leg elastic elastic member 5A is interposed between the upright sheet 4 and the outer sheet 10 and fixed by hot melt adhesive to fix the flat surface. In the form of gathering, the standing sheet 4 and / or the outer sheet 1
Another example is the case where the nonwoven fabric laminate according to the present invention is used as a sheet material forming 0. Still another example is a form in which a planar gather is configured by interposing an elastic elastic member 5B for leg around between the extended liquid-impermeable sheet 2 and the standing sheet 4 and fixing them with a hot melt adhesive. ,
Another example is the case where the nonwoven fabric laminate according to the present invention is used as the sheet material forming the standing sheet 4.

Although the above is an example of the tape type, although the explanation is omitted in the drawings, the nonwoven fabric laminate according to the present invention can be used for a pants-type paper diaper with the same idea. It can also be used for other absorbent articles such as sanitary napkins.

[0059]

EXAMPLES The effects of the present invention will be described below with reference to examples. <Relationship Between Amount of Softening Agent and Adhesiveness> The nonwoven fabric laminate according to the present invention is used as a sheet material for forming the standing sheet 4 of the disposable paper diaper according to the above-mentioned embodiment, and the gather sheet and other materials are used. The test was performed on the adhesive force (N) with the sheet material of (1) and the pull-in length (cm) of the rubber thread provided on the gather sheet.

The test on the adhesive strength was conducted in a dry state and a wet state. There are three types of gather sheets: no softener (conventional product), 1.0% softener (Example 1), and 1.5% softener (Example 2). Other sheet materials used are air-through nonwoven fabric and spunbond nonwoven fabric as shown in Table 1. The application amount of the hot melt adhesive used for adhering the gather sheet and other materials was the same, and the application amount adopted for the conventional product was used.

The test on the length of pull-in of the rubber thread was carried out by using a disposable disposable diaper at a temperature of 40 ° C. and a constant temperature of 70.
% Humidity was applied, and the pull-in length of the rubber thread at the tip and the root of each gather sheet (that is, arranged on the tip side and the root side of the standing cuffs B) was measured. The results are shown in Table 1.

[0062]

[Table 1]

As is clear from Table 1, in the non-woven fabric, as the amount of the softening agent mixed increases, the smoothness increases, but the adhesive strength decreases. Although not shown in Table 1, a softener mixed with 3.2% was also produced, but it was found that it had practically no adhesiveness and could not be put to practical use.

<Test on KES Value> Corresponding to the sensory evaluation of 100 adults was examined while repeating the test on the surface characteristics and the bending characteristics and collecting four data. This sensory evaluation is 1 to 4 for "smoothness" and "softness".
It is evaluated by four levels and is expressed as an average value. The higher the value, the higher the evaluation. The results of the sensory evaluation are shown in Table 2 together with the results of the KES evaluation. The comparative example is
All are current commercial products. In Example 3, 1% of the softening agent was mixed in both S layers to the commercially available product of Comparative Example 1 (where the nonwoven fabric having the SMS structure is used for the gather sheet) (thus, 0.5% in each layer). Others are the same example.

[0065]

[Table 2]

In Table 2, "smoothness" and "softness"
The evaluation was made by 5 test evaluators. Regarding "smoothness," 2 points are smooth and 1 level is slightly smooth.
0 points for no point, no smoothness, 2 points for softness, 2 points for softness, 1 point for softness, 0 points for hardness, and the total of 5 evaluation points is 0 to 4 points, x, 5 to 7 points are Δ, and 8 to 10 points are O. From Table 2, KE
It can be seen that by controlling the basic characteristics of the S system, it is possible to obtain a non-woven fabric having good "smoothness" and "softness".

On the other hand, the structure of the non-woven fabric laminate and the mixture of the softeners
The surface and bending properties were examined in the same way by changing the filling amount.
The results are shown in Table 3. The weight of the non-woven fabric is 15g
/ M ²It is what

[0068]

[Table 3]

[0069]

As described above, according to the present invention, it is rich in flexibility, has uniform and good smoothness and softness over the entire surface, and exhibits an excellent tactile sensation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method for testing surface characteristics.

FIG. 2 is an explanatory diagram of a bending characteristic test method.

FIG. 3 is a relationship diagram of bending characteristics.

FIG. 4 is a development view of the tape-type disposable diaper of the present invention.

5 is a view taken along the line 5-5 of FIG. 4, shown together with a modification.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D04H 3/16 (72) Inventor Satoshi Matsui 4765-11 Samukawa-cho, Iyo-Mishima City, Ehime Prefecture Dio Paper Converting Stock In-house F-term (reference) 3B029 BB02 BB07 BC02 BC07 4F100 AR00C BA03 BA04 BA05 BA10A BA10C CA30A CA30B CB03 DG15A DG15B EC032 EC182 GB71 JD15C JK04 JK16A YY00A YY00A YY00A YY00A YY00A YY00A YYAA

Claims (7)

[Claims] 1. A spunbonded non-woven fabric layer having a web formed by a spunbond method, and a meltblown nonwoven fabric layer having a web formed by a meltblown method. An absorbent article having a nonwoven fabric, characterized in that the spunbonded nonwoven fabric layer is placed on the outer surface of the absorbent article to be used for the laminated nonwoven fabric laminate. 2. The absorbent article having a nonwoven fabric according to claim 1, wherein the amount of the softening agent mixed in the nonwoven fabric laminate is 0.5 to 3.0% by mass. 3. The non-woven fabric laminate is adhered to another material with a hot melt adhesive, and the non-woven fabric layer on the adhering side comprises:
An absorbent article comprising the non-woven fabric according to claim 1, which is not mixed with a softening agent. 4. The non-woven fabric according to any one of claims 1 to 3, wherein the surface properties of the spunbonded non-woven fabric layer in the non-woven fabric laminate by the KES system satisfy the following conditions (1) and (2). (1) Average friction coefficient (MIU): MD is 0.01 to 1.
40, CD 0.01 to 1.50 (2) Average deviation of friction coefficient (MMD): MD 0.01
~ 1.00, CD 0.01 ~ 1.30 5. The non-woven fabric according to any one of claims 1 to 4, wherein the bending properties of the non-woven fabric laminate by the KES system satisfy the following conditions (1) and (2). (1) Bending rigidity (B): MD is 0.001 to 0.004
g · cm ² / cm, CD 0.001 to 0.020 g ·
cm ² / cm ⁽²⁾ hysteresis width (2HB): MD is 0.001
0.002g-cm / cm, CD 0.001-0.0
10 g / cm / cm 6. An extruded raw material mixed with a softening agent at a raw material stage before melt-extruding, a spunbonded nonwoven fabric layer having a web formed by a spunbond method; and a meltblown nonwoven fabric layer having a web formed by a meltblown method. A method for producing an absorbent article having a nonwoven fabric, comprising obtaining a laminated nonwoven fabric laminate, and incorporating the nonwoven fabric laminate so that the spunbonded nonwoven fabric layer is located on the outer surface of the absorbent article. 7. The non-woven fabric laminate is adhered to another material by a hot melt adhesive and incorporated therein, and the non-woven fabric laminate on which the softening agent is not mixed is used for the non-woven fabric layer on the adhering side. A method for producing an absorbent article having the nonwoven fabric according to claim 1.