JPH11286862A - Spun-bonded nonwoven fabric for clothes and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spun-bonded nonwoven fabric used for clothes, maintaining a good touch and simultaneously having an enhanced strength by laminating sheath-core type spun- bonded nonwoven fabrics to both the surfaces of a spun-bonded nonwoven fabric comprising polypropylene and subsequently thermally bonding the nonwoven fabrics to each other. SOLUTION: This spun-bonded nonwoven fabric for clothes comprises a spun-bonded nonwoven fabric having an average single filament fineness of 1-4 de and a METSUKE of 5-30 g/m<2> and sheath-core type fiber spun-bonded fabrics each having an average single filament fineness of 1-4 de and a METSUKE of 5-25 g/m<2> , wherein the sheath component of each conjugate filament constituting the sheath-core type spun bonded nonwoven fabric occupies 20-80 wt.% of the fiber cross section orthogonal to the fiber axis of each sheath-core type filament. The spun-bonded nonwoven fabric for clothes is produced by simultaneously melt-extruding and spinning polyethylene as a sheath component and polypropylene as a core component for two spinnerets, respectively, drawing the spun continuous conjugated filaments with high speed air blown out from an ejector, simultaneously taking off the drawn filaments, applying a static electricity to the filaments to open the filaments, collecting and accumulating the opened figments to form a web, and subsequently thermally fusing the fibers to each other on the web.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a surface material for sanitary materials such as diapers and sanitary napkins and a base material for clothing which have excellent spinnability during production, high strength and flexibility. The present invention relates to a suitable spunbonded nonwoven fabric for clothing and a method for producing the same.

[0002]

2. Description of the Related Art Nonwoven fabrics obtained by laminating a large number of long fibers made of a thermoplastic resin on a support and then providing a partially and regularly self-fused portion on the laminated sheet are generally used. It is called spunbond nonwoven fabric. This nonwoven fabric is not only superior in productivity to other nonwoven fabrics, but also has high sheet strength and is used in a wide range. In particular, among the spunbonded nonwoven fabrics, the spunbonded nonwoven fabric made of a polyolefin resin has a small specific gravity, and the specific gravity of the filament itself is higher than a nonwoven fabric produced using a polyamide resin such as nylon or a polyester resin such as polyethylene terephthalate as a raw material. Due to its excellent flexibility, it has become possible to enter into fields such as base materials for clothing.

[0003] However, when a spunbonded nonwoven fabric comprising a thermoplastic resin as a single component is thermally bonded by heating embossing, the bonding points are formed into a film without maintaining the fiber shape, and the texture is significantly impaired. Since it is not preferable as a base material for use, in order to improve this point, it has been proposed to use a conjugate fiber composed of different resins as a constituent fiber.

Conventionally, a part or all of the fiber surface is covered with another thermoplastic resin having a softening point lower than that of the thermoplastic resin constituting the fiber, that is, a core-sheath type fiber is formed, and the softening point of the fiber is increased. A nonwoven fabric which improves the adhesiveness and the texture after bonding by utilizing the difference is known (Japanese Patent Publication No. 42-21).
318, JP-B-43-1776).

Further, Japanese Patent Publication No. 54-38214 discloses a polystyrene, polyethylene, ethylene having a softening point at least 40 ° C. lower than that of a crystalline polymer having a fiber-forming ability such as polypropylene as a core component. When a propylene copolymer or the like is used as the sheath component, in the conventional method of producing a conjugate fiber by two steps of spinning and stretching, the affinity at the core-sheath interface is weak, so that the stretchability is poor. In order to eliminate the drawback of peeling, the spun yarn is used at a rate of 3200 to 9800 per minute during the composite spinning.
A manufacturing method is disclosed in which the material is picked up at a speed of m, deformed, cooled, and solidified at once.

As described above, as a composite long-fiber nonwoven fabric made of a polyolefin resin, a polypropylene resin is used as a core component.
The configuration in which the sheath component is a high-density polyethylene resin is the most common. Among them, linear low-density polyethylene is expected to have a soft hand, but a poor non-woven fabric with poor spinnability cannot be obtained. There is a problem that can not be.
In order to solve this problem, JP-A-2-61156 discloses a copolymer of ethylene and octene-1 containing substantially 1 to 10% by weight of octene-1 and having a density of 0.1 to 10%.
900 to 0.940 g / cm ³ linear low-density polyethylene is used as the sheath component of the composite fiber, and the core component of the composite fiber is polypropylene having a melt flow rate of 5 to 45 g / 10 min. A nonwoven fabric comprising a composite long fiber having a weight ratio of 20:80 to 80:20 is disclosed.

Japanese Patent Application Laid-Open No. Hei 5-186951 discloses that high density polyethylene contains 2 to 25 polypropylene per weight of high density polyethylene as a sheath component of a composite long fiber.
By weight% blending, the Q value (weight average molecular weight / number average molecular weight) is set to 3.5 or less, and polypropylene having a melt flow rate of 5 to 70 g / 10 min as a core component is used. A core-sheath type composite long-fiber nonwoven fabric having thermal adhesiveness is disclosed.

However, as described above, a composite long-fiber nonwoven fabric composed of a polyolefin having a structure in which polypropylene is used for the core component and high-density polyethylene is used for the sheath component has the advantages of low production cost, low specific gravity, and excellent flexibility. Nevertheless, if the weight ratio of the polypropylene of the core component is reduced, the strength of the long fibers constituting the nonwoven fabric becomes weak, and the strength of the composite long-fiber nonwoven fabric composed of such long fibers is also weak. Not only is there a fatal defect, but also because of the low strength of the long fibers, a large number of yarn breaks occur during the production of the nonwoven fabric, resulting in a high production cost.

Further, when such a core-sheath type composite long-fiber nonwoven fabric is used as a surface material of a pants-type disposable diaper which has recently become widespread, the weight ratio of polyethylene as a sheath component must be adjusted in order to impart heat sealability. Although it is necessary to increase the strength, there is a problem that the heat seal strength at the time of processing is insufficient because the strength of the nonwoven fabric is weak as described above.

Further, Japanese Patent Publication No. 8-14069 discloses that
The core component is polyethylene terephthalate, the sheath component is polyethylene or linear low-density polyethylene, and the sheath / core =
A composite nonwoven fabric having a thickness of 0.2 to 3.0 is disclosed. This nonwoven fabric can sufficiently impart the strength of the long fibers and the nonwoven fabric constituting the nonwoven fabric and the heat sealability of the obtained nonwoven fabric, but polyethylene terephthalate has a higher rigidity than polyolefin, and thus the obtained The rigidity of the resulting nonwoven fabric is also high, so that it is unsuitable for use in sanitary materials such as the above-mentioned pants-type disposable diaper surface material and base materials for clothing.

The inventor of the present invention has also disclosed in Japanese Patent Application No. 9-31185.
In No. 7, the core component is made of polypropylene having a Q value of 2.5 to 4.0, and the sheath component is made of polyethylene having a Q value of 1.5 to 2.7 and polymerized using a highly active metallocene catalyst. A core-sheath type composite long-fiber nonwoven fabric having a weight ratio of 30 to 90% by weight with respect to a fiber cross-sectional area orthogonal to the fiber axis is proposed. Although this nonwoven fabric could impart spinning properties during production, spreadability, and strength and heat sealability as a surface material of a diaper to be used to almost sufficiently, when used as a base material for clothing, However, there is a problem that the strength is insufficient because the proportion of polypropylene as a core component is too low.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to laminate a core-sheath type spunbonded nonwoven fabric using polypropylene as a core component and polyethylene as a sheath component on both surfaces of a spunbonded nonwoven fabric made of polypropylene, and then heat bonding them. Accordingly, it is an object of the present invention to provide a spunbonded nonwoven fabric for clothing that can impart high strength while maintaining a good texture, and a method for producing the nonwoven fabric having the above-mentioned properties, which has good spinnability and spreadability.

[0013]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present inventor has found that while maintaining the texture of a core-sheath composite spunbonded nonwoven fabric, it is possible to impart sufficient strength even when used as a base material for clothing. As a result of intensive research on possible nonwoven fabrics,
The texture of the core-sheath type spunbonded nonwoven fabric was maintained by laminating a specific core-sheath type spunbonded nonwoven fabric using a polypropylene resin as the core component and a polyethylene resin as the sheath component on both surfaces of the polypropylene spunbonded nonwoven fabric in a specific range. As it is, they have found that a spunbonded nonwoven fabric having a strength that can withstand the use as a base material for clothing can be obtained, and have completed the present invention.

A first aspect of the present invention is that the sheath component is made of polyethylene,
The present invention relates to a spunbonded nonwoven fabric for clothing in which a core-sheath type spunbonded nonwoven fabric having a core component made of polypropylene is laminated, and areas where fibers are fused by heat fusion are provided at intervals. Second, the spunbonded nonwoven fabric made of the polypropylene has an average fineness of 1 to 4 deniers and a basis weight of 5 to 30 g / m ² , and the core-sheath type spunbonded nonwoven fabric has an average fineness of 1 to 4 deniers and a basis weight of 5 to 25 g. / M ² , and the weight ratio of the sheath component to the fiber cross-sectional area orthogonal to the fiber axis of the composite filament constituting the core-sheath type spunbond nonwoven fabric is 20 to 80% by weight. The present invention relates to a spunbonded nonwoven fabric for use.

A third aspect of the present invention is that the sheath component is polyethylene,
The core component is made of polypropylene, melt-extruded and spun simultaneously from each of the two spinning outlets, and the spun continuous filament filaments are drawn while being drawn by high-speed air by an ejector, charged, opened, and then moved. After forming a web by collecting and depositing the web on a support, a spun continuous filament filament web made of polypropylene obtained in the same manner as above is laminated on the web, and the laminated web is further laminated. Polyethylene sheath component,
A method for producing the spunbonded nonwoven fabric for clothing, wherein, after laminating a continuous composite long fiber filament web having a core component of polypropylene, areas where fibers are fused by heat fusion are provided at intervals. It is about.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a polyethylene resin as a thermoplastic resin used as a sheath component of a composite long fiber is defined as a value obtained by dividing a weight average molecular weight by a number average molecular weight (weight average molecular weight / number average molecular weight). The Q value obtained is 4.5 or less, preferably 4.0 or less.

The Q value is defined as gel permeation.
It is indicated by the ratio between the weight molecular weight and the number average molecular weight of the polymer determined by chromatography (GPC), and this value indicates the distribution width of the molecular weight of the resin. It is known that it greatly affects the suitability for manufacturing and processability.

That is, as the Q value increases, the width of the molecular weight distribution increases, and the viscosity of the resin increases when the resin is melt-spun in a melt extruder to extend the spun filaments. Too much, and the spinnability decreases. When the Q value of polyethylene increases beyond 4.5,
Many yarn breaks occur during melt spinning, and it is difficult and unsuitable to produce a composite filament having a fineness of 4 denier or less. The lower limit of the Q value is not particularly specified, but if it is less than 2.5, it is difficult to control the synthesis conditions for producing the polymer, and it is not easy to obtain a resin. Is 2.5.

The density of the polyethylene is 0.8
50 to 0.970 g / cm ³ , preferably 0.855 to
It is in the range of 0.965 g / cm ³ . 0.850 density
When a polyethylene polymer of less than g / cm ³ is used, when the core-sheath type composite filament obtained by melt-spinning is charged and opened, the charge amount is reduced, and the spreadability is reduced. This is not suitable because the texture of the resulting composite spunbonded nonwoven fabric decreases. On the other hand, the density is 0.970 g / cm
Polyethylene resins exceeding ³ are not suitable because they have poor flexibility and are difficult to obtain on the market. The polyethylene having the best spreadability is a high-density polyethylene having a density of 0.950 to 0.965 g / cm ³ .

Further, JIS K 67 of the polyethylene is used.
190 ° C, load 2.1 measured by the method described in No. 60
The melt flow rate under the condition of 6 kg is 10 to 70 g /
The range is 10 minutes, preferably 10 to 50 g / 10 minutes. If the melt flow rate is less than 10 g / 10 minutes, the melt viscosity is too high, and the texture of the obtained nonwoven fabric becomes hard, which is not suitable. Conversely, the melt flow rate is 70 g /
If the time exceeds 10 minutes, yarn breakage tends to occur in the spinning step, and not only the feeling of the obtained long-fiber nonwoven fabric decreases, but also the strength decreases, which is not suitable.

The polyethylene of the sheath component may contain additives such as a lubricant, a pigment, a stabilizer, a flame retardant, and an antibacterial agent.

In the present invention, the polypropylene used for the core component and the polypropylene spunbonded nonwoven fabric located in the intermediate layer having the three-layer structure has the above-mentioned Q value of 2.0 to 3.5.
The melt flow rate under the conditions of 230 ° C. and a load of 2.16 kg measured by the method described in JIS K 7210 in the range of 10 to 100 g / 10 min, preferably 30
８０80 g / 10 min. Polypropylene having a Q value of less than 2.0 is not easily available because it is difficult to produce,
If the Q value exceeds 3.5, the yarn may break. In the case of polypropylene having a melt flow rate of less than 10 g / 10 minutes, melt spinning at a high speed becomes difficult unless the melting temperature is increased, and spinning at a high temperature tends to cause stains on a die surface. Not preferred. Conversely, if the melt flow rate exceeds 100 g / 10 minutes, thread breakage occurs frequently, and not only the texture of the resulting spunbonded nonwoven fabric decreases, but also the strength decreases, which is not suitable.

Further, the polypropylene may contain additives such as a lubricant, a pigment, a stabilizer, a flame retardant, an antibacterial agent and the like, similarly to the case of the polyethylene of the sheath component.

When a spunbonded nonwoven fabric is produced by using an extrusion spinning machine, polyethylene is used as a sheath component, polypropylene is used as a core component, or polypropylene alone is heated and melted. The melting temperature when spinning is 50 to 135 ° C. from the melting point of the resin. Just higher. If the melting temperature is higher than the melting point of the polymer by less than 50 ° C., the viscosity of the melted resin is high and is not suitable for spinning. Conversely, if the melting temperature is higher than the melting point of the resin by more than 135 ° C., the temperature difference from the melting point of the resin is too large, so that the cooling becomes difficult when spinning the resin from a large number of spinnerets of the extrusion spinning machine. Not only is it easy to cause fusion between the fibers and breakage of the yarn, but also the stability of the resin is reduced, and there is a possibility that decomposition occurs.

In particular, when performing the core-sheath composite spinning, it means that the respective resins of the core component and the sheath component are spun at substantially the same temperature, and the difference between the melting temperatures of the core component and the sheath component is ± 1. .
Acceptable up to 5 ° C, preferably ± 1.0 ° C. When the absolute value of the melting temperature of the core component resin and the sheath component resin exceeds 3 ° C., the cooling of the composite yarn after melt extrusion does not proceed smoothly, and distortion due to uneven cooling of the yarn is caused. Remains, so that good spinnability cannot be realized, and as a result, yarn breakage occurs and the nonwoven fabric becomes non-uniform.

The polypropylene as the core component and the polyethylene as the sheath component are extruded at the same temperature from a die of a melt-extruding spinning machine and spun, and then drawn by high-speed air by an ejector, stretched, and then formed. A long fiber filament is applied to the impact plate and triboelectrically charged.
The fiber is opened by the repulsive force of the electric charge. In this case, corona discharge treatment can be performed as a charging method.

The average fineness of the conjugate long fibers used in the present invention is preferably in the range of 1 to 4 denier. If the average fineness of the long fibers exceeds 4 denier, when used as a base material for clothing, the fiber diameter becomes too large, the resulting nonwoven fabric becomes hard and the texture is reduced, and those having a fineness of less than 1 denier are not manufactured. Not only is it difficult, but the gap between the long fibers constituting the nonwoven fabric is too dense, and the air permeability is reduced, which is not suitable in some cases.

The cross-sectional shape of the composite long fiber may be irregular or flat in addition to the circular cross-section.

In the present invention, the weight ratio of the polyethylene of the sheath component to the fiber cross-sectional area perpendicular to the fiber axis of the composite filament constituting the composite spunbond nonwoven fabric is 20 to 80.
Preferably, it is weight%. When the weight ratio of polyethylene is less than 20% by weight, the fiber strength is increased, but not only the adhesive strength is weakened, but also the obtained nonwoven fabric cannot be imparted with flexibility, which is not suitable in some cases. Conversely, when the weight ratio of polyethylene exceeds 80% by weight, the adhesive strength increases, but the fiber strength is too weak.
Not only the strength of the obtained nonwoven fabric is weakened, but also yarn breakage frequently occurs during the manufacturing process and the manufacturing cost increases, which is not suitable in some cases.

The basis weight of the composite spunbonded nonwoven fabric in the present invention is preferably in the range of 5 to 25 g / m ² .
If the basis weight is more than 25 g / m ² , the nonwoven fabric obtained after lamination becomes too hard, the flexibility is reduced, and the texture becomes poor, which is not suitable. Conversely, if it is less than 5 g / m ² , not only the strength of the nonwoven fabric is lowered, but also the effect of imparting a texture to the nonwoven fabric is reduced, so that it may not be suitable.

According to the present invention, in a known melt-extrusion apparatus for composite spunbond, different thermoplastic resins are melt-extruded and spun to form a composite continuous fiber web composed of a core component and a sheath component. A long-fiber web made of polypropylene obtained by using a melt-extrusion apparatus of the present invention is deposited. Furthermore, after laminating the composite continuous fiber web obtained in the same manner as described above on the laminated web, a composite spunbonded nonwoven fabric obtained by providing, at intervals, areas where the fibers are fused by heat fusion is provided. And its manufacturing method.

As the polypropylene spunbonded nonwoven fabric used as the second layer of the present invention, the same polypropylene spunbonded nonwoven fabric as the core component of the composite spunbonded nonwoven fabric described above is used.

The average fineness of the polypropylene filament used in the present invention is preferably in the range of 1 to 4 denier. If the average fineness of the long fibers exceeds 4 denier, when used as a base material for clothing, the fiber diameter becomes too large, the resulting nonwoven fabric becomes hard and the texture is reduced, and those having a fineness of less than 1 denier are not manufactured. Not only is it difficult, but the gap between the long fibers constituting the nonwoven fabric becomes too dense, and the air permeability as a base material for clothing is reduced, which is not suitable in some cases.

The polypropylene spunbond of the present invention
Weight of the non-woven fabric is 5 to 30 g / m ^TwoIs in the range of
preferable. The basis weight is 30 g / m^TwoExceeds, it is obtained after lamination
The non-woven fabric becomes too hard, the texture becomes poor and it is suitable
May not be. Conversely, 5 g / m^TwoLess than the nonwoven
It may not be suitable because the strength is too low.

The composite spunbonded nonwoven fabric to be the third layer of the present invention is manufactured by the same manufacturing method as that for the composite spunbonded nonwoven fabric.

In the present invention, self-fused areas of fibers are provided at regular intervals for the purpose of imparting sheet-like shape retention and strength to the nonwoven web laminated in three layers. The self-fusing area is formed by introducing the web between the heated uneven roll and the smooth roll, applying heat and pressure treatment, and fusing the portion corresponding to the convex portion of the uneven roll. . In this case, the temperature of the roll is a temperature lower by 5 to 50 ° C. than the melting point of the resin constituting the long fiber used.
If the difference between the roll temperature and the melting point of the resin is less than 5 ° C., the fibers will adhere to the roll during thermocompression treatment by the roll, causing a manufacturing trouble. Conversely, if the difference between the roll temperature and the melting point of the resin exceeds 50 ° C., the formation of the self-fused portion becomes insufficient, and the strength of the spunbonded nonwoven fabric is remarkably reduced.

The linear pressure when the thermocompression treatment is performed with the uneven roll and the smooth roll is 10 to 80 kg / cm. If the linear pressure is less than 10 kg / cm, the self-bonding area by the thermocompression bonding process is insufficiently formed, and if it exceeds 80 kg / cm, the long fiber is cut by the convex portion of the uneven roll during the thermocompression bonding process. In any case, the strength of the spunbonded nonwoven fabric is reduced, so that it is not suitable.

As a method of forming the self-fused area, a web composed of a group of continuous continuous filament fibers is used.
It is also possible to form a point-fused portion corresponding to the projection by introducing it between the uneven roll and the ultrasonic horn and performing ultrasonic treatment.

In the present invention, the area of each self-fusion zone is preferably in the range of 0.03 to ⁴ mm ² . If the area of the self-bonding area is less than 0.03 mm ² , the strength of the obtained nonwoven fabric is insufficient, which is not suitable. Conversely, if the area of the self-fusing area exceeds 4 mm ² , the resulting nonwoven fabric becomes too hard, and is not suitable as a base material for clothing because the texture deteriorates.

The total area of the self-fused area is preferably 2 to 30% of the total surface area of the long-fiber nonwoven fabric. If the total area of the self-fused area is less than 2%, the strength of the obtained nonwoven fabric is insufficient, which is not suitable. Conversely, if the self-fused area exceeds 30%, the obtained nonwoven fabric becomes too hard,
It is not suitable as a base material for clothing because the texture deteriorates.

As described above, a long fiber web made of polypropylene is laminated on a core-sheath type composite long fiber web made of polypropylene as the core component and polyethylene as the sheath component, and the core-sheath type composite long fiber obtained above is further laminated. A clothing spunbonded nonwoven fabric obtained by fusing fibers with each other by heat fusion of a three-layer web obtained by laminating webs,
Since it is excellent in spinnability and openability, and has excellent flexibility and texture, it can be suitably used as a base material for clothing.

[0042]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. In Examples and Comparative Examples,% is% by weight unless otherwise specified.

Example 1 Melt flow rate: 25 g / 10 min, melting point: 128 ° C.
Was prepared as a sheath component and polypropylene (manufactured by Japan Polychem) having a melt flow rate of 50 g / 10 min and a melting point of 163 ° C. was used as a core component.

Next, using a core-sheath type composite spinneret in a melt extruder, the weight ratio of the sheath component occupying 70% to the fiber cross section perpendicular to the fiber axis of the composite long fiber constituting the nonwoven fabric was obtained. Are heated and melted at 250 ± 1 ° C. respectively,
After extruding from a large number of micropores and spinning, the spun filaments are stretched and drawn by high-speed air with an ejector, and are collected and deposited on a moving wire-made collecting support. Formed. The average fineness of the obtained long fiber filament was 1.3 denier, and the basis weight was 23 g / m ² .

On the web, the above-mentioned polypropylene was heated at 250 ° C. using a single-component die in a melt extruder.
After being heated and melted, extruded from a number of micropores and spun,
The spun filament group was stretched and drawn while being taken up by an ejector with high-speed air, and collected and deposited. The average fineness of the obtained polypropylene filament fiber was 1.5 denier, and the basis weight was 27 g / m ² .

Further, a nonwoven web was manufactured by the same manufacturing method as that of the core-sheath type composite continuous fiber web, and collected and deposited on the laminated web. Next, the laminated web was introduced between the uneven roll and the smooth roll heated to 120 ° C.
A spunbonded nonwoven fabric was obtained by fusing a portion corresponding to the convex portion of the concave and convex roll at kg / cm. The area of each self-fusion zone was 0.12 mm ² , and the total area of the self-fusion zone was 4 area%. The obtained spunbonded nonwoven fabric was tested by the following test method, and its quality was evaluated.

Test Method (1) Spinnability Evaluation was made based on the number of yarn breaks during melt spinning. The evaluation was based on the following five levels. 5: No thread breakage, and spinning properties are extremely good. 4: There is almost no yarn breakage, and the spinnability is good. 3: There is no problem with thread breakage, and the spinnability is normal. 2 ... Yarn breakage is considerable and spinnability is poor. 1 ... The yarn breakage is extremely large, and the spinnability is extremely poor.

(2) Flexibility (Point) Flexibility was evaluated by sensory evaluation by 20 monitors. The monitor rubbed the nonwoven fabric by hand to determine the flexibility of the nonwoven fabric. Evaluation is shown by 1 to 5 points according to the following criteria, and the total score (100 points) is expressed as flexibility.
A score of 90 or more was accepted. 5 ... The flexibility of the nonwoven fabric is very excellent. 4 ... The flexibility of the nonwoven fabric is excellent. 3 ... The flexibility of the nonwoven fabric is normal. 2 ... The flexibility of the nonwoven fabric is inferior. 1 ... The flexibility of the nonwoven fabric is very poor.

(3) Tensile strength (N
/ 50 mm) It was carried out by the method shown in JIS L 1906. (4) Formation (Points) The formation of the obtained nonwoven fabric was evaluated organoleptically. The evaluation was based on the following five levels. 5 ... The formation of the nonwoven fabric is very excellent. 4: The formation of the nonwoven fabric is excellent. 3: The formation of the nonwoven fabric is normal. 2 ... The formation of the nonwoven fabric is inferior. 1 ... The formation of the nonwoven fabric is very poor.

Example 2 The average fineness of the core-sheath composite spunbonded nonwoven fabric was 3.7 denier.
6g / m ^Two, Composite long fibers constituting nonwoven fabric
Is the weight ratio of the sheath component in the fiber cross section orthogonal to the fiber axis.
60%, average of polypropylene spunbond nonwoven fabric
Fineness is 3.5 denier and basis weight is 7 g / m^TwoBecause
Outside, a spunbonded non-woven fabric for clothing is used in the same manner as in Example 1.
Manufactured. The obtained nonwoven fabric was subjected to the same test method as in Example 1.
More testing and evaluation of its quality.

Example 3 The average fineness of the core-sheath composite spunbonded nonwoven fabric was 1.2 denier.
7g / m ^Two, Composite long fibers constituting nonwoven fabric
Is the weight ratio of the sheath component in the fiber cross section orthogonal to the fiber axis.
25%, average of polypropylene spunbond nonwoven fabric
Fineness: 1.3 denier, basis weight: 9 g / m^TwoBecause
Outside, a spunbonded non-woven fabric for clothing is used in the same manner as in Example 1.
Manufactured. The obtained nonwoven fabric was subjected to the same test method as in Example 1.
More testing and evaluation of its quality.

Example 4 The core-sheath type composite spunbond nonwoven fabric had an average fineness of 3.5 denier, a basis weight of 16 g / m ² , and the weight of the sheath component occupying the composite long fibers constituting the nonwoven fabric in the fiber cross section perpendicular to the fiber axis. A spunbonded nonwoven fabric for clothing was produced in the same manner as in Example 1, except that the ratio was 30%, the average fineness of the polypropylene spunbonded nonwoven fabric was 3.7 denier, and the basis weight was 16 g / m ² . The obtained nonwoven fabric was tested by the same test method as in Example 1, and its quality was evaluated. Table 1 shows the results obtained in the examples and comparative examples.

[0053]

[Table 1]

As is clear from Table 1, when the conditions of the present invention are met, no thread breakage occurs when the resin is melt-spun by a melt extruder, and the resulting spunbonded nonwoven fabric for clothing has high strength. Yet, it is excellent in flexibility and formation.

[0055]

The present invention has the effect of providing a spunbonded nonwoven fabric for clothing having excellent spinnability during production, high strength, flexibility, and good formation, and a method for producing the same.

Claims (3)

[Claims] 1. A core-sheath type spunbonded nonwoven fabric comprising a sheath component made of polyethylene and a core component made of polypropylene is laminated on both sides of a spunbonded nonwoven fabric made of polypropylene. A spunbonded nonwoven fabric for clothing characterized by being provided in the above. 2. The spunbond nonwoven fabric made of polypropylene has an average fineness of 1 to 4 deniers and a basis weight of 5 to 30 g.
/ M ² , the core-sheath type spunbond nonwoven fabric has an average fineness of 1 to 1.
4 denier, the basis weight is 5 to 25 g / m ² , and the weight ratio of the sheath component to the fiber cross-sectional area perpendicular to the fiber axis of the composite long fiber constituting the core-sheath type spunbonded nonwoven fabric is 2
A spunbonded nonwoven fabric for clothing, which is 0 to 80% by weight. 3. The sheath component is made of polyethylene and the core component is made of polypropylene. Each of the two components is melt-extruded and spun simultaneously from two spinning outlets, and the spun continuous filament filaments are drawn while being drawn by high-speed air by an ejector, and charged. The web is then collected and deposited on a moving support to form a web, and then spun continuous filaments made of polypropylene obtained in the same manner as above on the web. After laminating a filament web, and further laminating a continuous composite long fiber filament web in which the sheath component is polyethylene and the core component is polypropylene on the laminated web, the areas where the fibers are fused by heat fusion are spaced apart. The method for producing a spunbonded nonwoven fabric for clothing according to claim 1, wherein the nonwoven fabric is provided.