JPS6037231B2 - brushed artificial leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to raised artificial leather, and more specifically, to a nonwoven fabric made of ultrafine fibers with no fiber pattern and useful as a base fabric for artificial leather, and a method for producing the same. It is.

Natural leather has a structure as shown in FIG. 1 of the accompanying drawings.

In Fig. 1, thick collagen fibers East 2B are distributed on the flesh side of the natural leather, and these thick fibers gradually branch into thinner fiber bundles as they approach the grain side. It is divided into thin fibers or single fibers, covering the silver surface uniformly and delicately. Therefore, if you brush the flesh side of natural leather, you will get coarse suede leather with thick fuzz 3C, but if you brush the grain side, you will get fine fuzz 3C.
A nubuck skin with a graceful texture having B is obtained. This nubuck leather is considered the most luxurious of all leather products. A base fabric for producing artificial leather having such an elegant natural leather-like feel and appearance is generally required to have the following properties.

1. It should be able to form a uniform and delicate fluff on the surface and have an elegant writing effect (for example, chalk marks); 2. It should be flexible and rich in sense of fulfillment.

As a conventional base fabric for artificial leather proposed for the purpose of satisfying the above requirements, a nonwoven fabric described in Japanese Patent Publication No. 47-44605 is known.

Artificial leather using this nonwoven fabric will be explained with reference to FIG. 2 of the accompanying drawings. In Figure 2, this artificial leather is
It consists of a nonwoven fabric base fabric made up of a large number of ultrafine fibers 2A entangled with each other, and a polymeric elastic body 3 mainly made of polyurethane impregnated into the gaps between the ultrafine fiber bundles. On the surface of this artificial leather, the tips of the ultrafine fibers 2A are exposed, forming a nap layer 3A. Ultra-fine fiber east 2
A consists of 5 to 200 ultrafine fibers, each of which has a weave of 0.001 to 0.5 denier. The raised layer 3A formed on the surface of such artificial leather is formed by the eastern ends of a large number of ultra-fine fibers, so
This pile layer 3A is formed from a large number of mutually independent tufts of ultrafine fibers. Therefore, within the napped layer 3A, there are areas where the ultrafine fibers are densely distributed and areas where the ultrafine fibers are sparsely distributed, so that the distribution of fluff in the napped layer becomes uneven. For this reason, for example, when the fluff is short, the impregnated resin layer is atomized on the surface between each pile tuft, resulting in artificial leather having a rough texture and the appearance and feel of cheap leather. In other words, such a nonwoven base fabric could not fully satisfy the above requirements. The present inventors have completed the present invention as a result of various studies aimed at solving the problems of the conventional base fabrics for artificial leather as described above.

An object of the present invention is to provide a brushed artificial leather that is flexible and has a rich sense of fulfillment.

Another object of the present invention is to provide a raised artificial leather having fine and uniform fluff and an elegant lighting effect.

The above object is achieved by the present invention.

The brushed artificial leather of the present invention consists of melt-blown ultrafine fibers that are substantially separated into single fibers, randomly distributed, and have an average fiber diameter of 0.1 to 5.0 fm, which are mutually tertiary. It comprises a non-woven fabric which is originally constructed by intertwining, and a rubber-like elastic polymer interposed in the interstitial spaces of the non-woven fabric, and
It has a surface covered with fluff made of single fibers similar to the ultrafine fibers. The structure of the nonwoven fabric used in the raised artificial leather of the present invention will be explained with reference to FIG.

In FIG. 3, the ultrafine fiber bundles in the nonwoven fabric are three-dimensionally intertwined with each other to form a homogeneous nonwoven fabric. The ultrafine fibers used in the present invention have an average fiber diameter of 0.1 m to 5.0 m. If the average fiber diameter is smaller than 0.1 mm, the strength of the fibers (fuzz) is insufficient for practical use.
The resulting nonwoven fabrics are often too soft and good writing effects and chalk marks cannot be obtained. Furthermore, if the average fiber diameter exceeds 5 mm, the resulting nonwoven fabric will have insufficient flexibility, making it impossible to obtain a good lighting effect. In the present invention, by using ultrafine fibers with an average fiber diameter of 0.1 to 5 meters, preferably 0.5 to 3 meters, the resulting nonwoven fabric can provide nubuck-like artificial leather. can. The ultrafine fibers used in the present invention are not particularly limited as long as they satisfy the above average fiber diameter value, but include, for example, polyester, polyamide, polyolefin, polyacrylonitrile, or copolymers mainly composed of the above polymers. Alternatively, it may be made of a synthetic polymer such as a polymer compound, or a recycled fiber such as rayon or cupra.

Such ultrafine fibers may be produced by any method, but for example, they may be produced by a melt blowing method from synthetic polymers that can be melt woven. The nonwoven fabric used in the present invention can be produced by the following method.

A random web is formed from ultrafine fibers that are substantially randomly distributed, do not form so-called fiber regions, and have an average fiber diameter of 0.1 to 5.0 mm. The method of forming this random web is not particularly limited, and may be formed by, for example, a melt blowing method. This melt flow method is disclosed, for example, in Hakamoseki Publication No. 50-46972, and this method will be explained with reference to FIGS. 4 and 5 of the accompanying drawings. 4 and 5, a thermoplastic synthetic polymer is melted by an extruder 5 and extruded through a number of spinning orifices 12 arranged in a row. At the same time,
A heated high-speed gas, generally air, supplied through the pipe 6 is blown against the flow of the fibrous molten synthetic polymer extruded from the slits 13 provided on both sides of the orifice 12, and the effect of the air flow is The extruded fibrous melt is stretched into the shape of ultrafine fibers 7, cut, and solidified while being agitated. The ultrafine short fibers thus formed are deposited on a screen (collector) 9 circulating between a pair of rotating rollers 10 by a jet air flow (turbulent flow) to form a random web 8. It is sent out by a pair of nip rollers (feeding rollers) 11. In this case, the ultrafine short fibers are randomly disturbed by the turbulence, so that they do not substantially form a fiber east.
In the random web formed in this way, the ultrafine fibers are arranged almost horizontally and entangled with each other, but there is almost no entanglement in the vertical direction, so this random web has three-dimensional entanglement. I cannot say that it is true.

This is also clear from the electron micrograph shown in FIG. 6 of the accompanying drawings. There are tensile strength and degree of entanglement as a measure of the degree of entanglement of ultrafine fibers, and the tensile strength of the random web formed by the above method is 0.1k.
9/low density, high density is about 0.02 to 0.05 poly/ground. Even if such a random web is pressed at room temperature to prevent heat fusion of the fibers and the density is about 0.2 K9/Chu, the tensile strength remains at a low value of less than 0.5 K9/K9. This shows that three-dimensional entanglement of fibers in the random web is extremely low. According to such a melt blowing method, the average fiber diameter can be reduced to 0.001 by appropriately selecting the paper mouth temperature, gas flow temperature, gas pressure, discharge base, etc. according to the type of synthetic polymer used.
A random web of ultrafine fibers of 1 to 5.0 rm can be obtained.

For example, by melting polyethylene terephthalate and using the melt blow method, the spinneret temperature is 320qo and the gas temperature is 365qo.
o, gas pressure 3.5 kg/, discharge amount 0.2 min/min
A random web consisting of ultrafine staple fibers with an average fiber diameter of 2.0 m can be obtained under the following conditions: Fibers produced by the melt-blowing method described above have an extremely small average fiber diameter (about several tens of meters to 1/101 meter), so it is difficult to measure the average length of the fibers. Generally, it is estimated to be more than 3 sides, and in most cases about 100 to 30 sides. In the random web, the ultrafine fibers need to have a degree of freedom of movement for rearrangement without being fused to each other. Therefore, it is possible to prevent fibers from fusing together during production of ultrafine fibers,
Moreover, in order to achieve uniform distribution, the distance between the twill orifice and the screen, that is, the gathering distance, is preferably 20-60 cm, more preferably 25-55 cm. The random web obtained as described above is subjected to an entanglement treatment by spraying a high-speed fluid stream from above.

As this high-speed fluid, it is generally effective to use a liquid, especially water. This allows the ultrafine fibers to be entangled with each other in the crossing operation without substantially damaging them. On the other hand, if the needle punching method, which is commonly used to produce nonwoven fabrics, is applied to the present invention, the ultrafine fibers will be damaged, making it difficult for the fibers to intertwine with each other, and holes will only be formed due to the needle burp. Not, but
This is undesirable because it damages tissues. The entanglement process in the present invention can be carried out using, for example, an apparatus as shown in FIG.

In FIG. 7, a random web 15 is fed onto a screen 14 rotating in the direction of arrow A by a pair of rotating driving rowhoos 13A.

From a high-pressure water source (not shown), high-pressure water is supplied via a supply pipe 16 to an orifice head 17, from which it is distributed to a number of narrow orifices 18, from which it forms a narrow high-pressure water stream 19. At the same time, it is jetted toward the random web 15. The nonwoven fabric strip that has been subjected to the interlacing treatment in this manner is sent out by a pair of delivery rollers. At this time, the orifice head may be moved back and forth in the direction of the random web in order to uniformly spray the high-pressure water stream over the entire surface of the random web. In the nonwoven fabric of the present invention, if the entanglement treatment using the high-speed fluid is excessively performed, the three-dimensional entanglement between the ultrafine fibers within the nonwoven fabric will proceed excessively, compression of the nonwoven fabric will occur, and the degree of freedom of movement between the fibers will increase. may be excessively reduced, resulting in a thin, paper-like, coarse and hard nonwoven fabric.

Such nonwoven fabrics are unsuitable as base fabrics for artificial leather. Therefore, the nonwoven fabric of the present invention preferably has a tensile strength of 0.5 to 3.0 kg/skin at a thickness of 0.6 kg, more preferably 1.2 to 2.6 kg/skin, particularly preferably 1.5 kg/skin.
~2.5k9/skin, and preferably has a density of 0.
12 to 0.28 evening/earth, more preferably 0.15 to 0.28 evening/earth.
It has 28 multiplicity/ground. In addition, the nonwoven fabric of the present invention usually has a resistance of 60 to 300%, particularly preferably 100 to 3%
It is preferable to have a basis weight of 00/. In general, water can be suitably used in high-speed fluid processing for producing the nonwoven fabric structure of the present invention.

That is, water is passed through a large number of narrow orifices, preferably with an inner diameter of 0.05 to 0.20, more preferably with a diameter of 0.
．． From an orifice of 0.05 to 0.15 mm, the pressure is preferably 10 to 40 kg/, more preferably 15 to 35 k9
Make it squirt with /c treatment. This jet stream is then blown onto the surface of the random web placed on the water-permeable screen from above. In this case, it is desirable to perform suction treatment on the back side of the screen. This suction causes the lines on the screen to be drawn. Remove the air in the Ndamweb,
The water jets tend to penetrate into the laminate and promote entanglement between the fibers. For this suction, it is preferable to form a decompression castle of 15 to 15 days on the back side of the screen.
. Excessive suction is undesirable because it impedes the movement of the fibers within the laminate and makes it difficult to intertwine the fibers. In addition, wire mesh is used as a screen, and its fine mesh
This is preferable in order to obtain a nonwoven fabric with a smooth and uniform surface. In the random web for obtaining the nonwoven fabric of the present invention,
It is important that the ultrafine fibers are randomly distributed with respect to each other without forming fiber regions.

If a large number of such fibers exist, it is difficult to dismantle and disperse the fibers into single fibers by high-speed fluid treatment, resulting in unsatisfactory texture, entanglement strength, etc. of the resulting nonwoven fabric. . In addition, if excessive high-speed fluid treatment or needle punching is applied to the laminate to dismantle the fibers, these treatments can damage or cut the fibers, causing streaks and holes in the resulting product, and , it also has disadvantages such as a decrease in its strength. The regular feature of the nonwoven fabric of the present invention is that all of the ultrafine single fibers are intertwined with each other to form a homogeneous structure. It is possible to obtain a leather-like material with physical properties that are impossible to achieve.

Generally, the strength and flexibility of nonwoven fabrics are closely related to their density, and the higher the density, the greater the strength, but on the other hand, the texture and
becomes stiff and less flexible. In order to obtain a base fabric that simultaneously has flexibility and high strength (particularly sewing strength) suitable for use in clothing, the ultrafine single fibers in the nonwoven fabric must be uniformly entangled with each other. Only through this process can a nonwoven fabric with a high degree of flexibility and a sense of fulfillment be obtained. The nonwoven fabric of the present invention can be used not only as a base fabric for artificial leather but also in fields such as filters.

In order to produce the artificial leather of the present invention using the above-mentioned nonwoven fabric, any conventional production method may be used, but for example, the method disclosed in Japanese Patent Publication No. 37-248y may be used. I can do it.

When using this method, the nonwoven fabric is always polyurethane, NB
After impregnating with a rubbery elastic polymer such as R and solidifying,
If necessary, the surface (the surface of the nonwoven fabric component) is rubbed with sandpaper or a wire brush to give it a napping treatment. Then, an artificial leather having a structure as shown in FIG. 8 of the accompanying drawings is obtained. In FIG. 8, ultrafine fibers 1 are intertwined with each other, and their voids are impregnated with a rubber-like elastic polymer 3. On the surface of this artificial leather, fluff 2 made of ultrafine fibers is uniformly and densely distributed. The nonwoven fabric of the present invention preferably has a weave area shrinkage of 5% to 30%.

A nonwoven curtain having an areal shrinkage within this range can be impregnated with a solution of a rubber-like elastomeric polymer in an organic solvent, such as N,N-dimethylformamide, without substantially reducing its shrinkage. After impregnating the rubber-like elastic polymer in this manner, the area shrinkage of 5 to 20% improves the elasticity and thickness of the resulting artificial leather. Furthermore, when the surface of the nonwoven fabric component side is raised, a fine and uniform fluff of ultrafine fibers is formed. Therefore, even if the length of the fluff is cut extremely short, the surface of the artificial leather is sufficiently covered with the fluff of the ultrafine fibers, the rubber-like elastic polymer is not exposed, and a nubuck-like artificial leather can be obtained. In order to produce artificial leather that is rich in elasticity and flexibility, the amount of rubber-like elastic polymer impregnated into the nonwoven fabric strip of the present invention is generally 2 times the normal weight of the nonwoven fabric.
Preferably, it is 0 to 60%. Another feature of the nonwoven fabric of the present invention is that a leather-like material with uniform surface fluff and high fluff density can be obtained.

The state of fuzz generation is mostly determined by the entangled structure of the nonwoven microfibers. When a nonwoven fabric with a conventional structure in which fibers are entangled is raised, as shown in Figure 2,
It appears as a stump-like bellows-like fluff on the eastern side of the fibers.
This type of fluff in the east of the fibers is particularly difficult when the fluff length is shortened.
The rubber-like elastic polymer is exposed and the surface texture is rough, which significantly reduces commercial value. However, since the nonwoven fabric of the present invention usually has a structure in which ultrafine fibers are intertwined with each other in a three-dimensional manner, a major feature is that fuzz consisting only of ultrafine fibers is generated at a high density on the raised surface. Moreover, since this fluff is particularly ultrafine fiber with an average fiber diameter of 0.1 to 5.0 mm, even if the average fluff length is shortened to 1001 m or less, especially to about loAm, beautiful chalk marks remain. It has an excellent lighting effect in which the appearance of ``Nubuck'' and a moist surface touch unique to natural leather, which could not be produced with conventional fibers. is obtained. The present invention will be explained in more detail with reference to Examples below.

However, measurements of various physical properties shown in Examples and Comparative Examples are as follows:
It was carried out by the following method. 1. Tensile strength: Take a sample with a length of 20 arcs and a width of 1 inch, set the grip length to 1c, and cut it by elongation using an autograph to find the maximum strength at that time.

2. Elongation recovery rate: Take a sample of length 20 skins x width 1 skin from the nonwoven fabric strip, grasp the top 5 skins, and fix the sample in a suspended form from above.

Next, grasp the lower end 5 cm and suspend a load of 1.0 k9 to measure the elongation. Let the initial length be Lo (skin), 1
Determine the length L (skin) when a load is applied for a while, then remove the load and leave it for another 10 minutes. The length at this time is L
(skin), the following formula elongation recovery rate = 33 tones X・oo(
%) to find the elongation recovery rate.

3 Compression rate and compression recovery rate: Non-woven fabric 10 skin x 10
Collect a small square piece of a fox's ribs, stack this 1q piece, place a thin metal plate of the same width (50 pieces) on top of it, leave it for 2 minutes, measure its thickness, then 10k9 pieces. Apply the load evenly over the entire surface and leave it for 30 minutes.

The thickness t after 3 minutes under load is measured, then the load is removed and the sample is left for another 3 minutes, and the thickness at that time is determined. From to, t2, the compression rate and compression recovery rate are calculated by the following formula:
Compression rate = Uyo x Loo (%) Compression recovery rate = Imoyo Xloo (%) It is given as follows.

4 Groove density: Weight per unit volume, measured by the following method.

Using a Maeda compressive elasticity measuring machine, samples of 6 skins x 7 skins were placed on a pair of discs with a diameter of 2.0 cm, and a load of 5.0 cm (1
．． Measure the thickness and calculate the volume. Divide the weight of the sample by the above volume to determine the high density. Example 1 Using an apparatus of the type shown in Figures 4 and 5, polyethylene terephthalate was heated at a paper mouth temperature of 320°C and a gas temperature of 3.
65q0, gas pressure 4.0k9/ground and resin discharge amount 0.
The melt flows under the conditions of 2 nights/min/orifice, and is collected in bottles on a moving wire mesh at a collecting distance of 40 arc, with a basis weight of 200.
Evening/I got that random web.

The boiling water area shrinkage rate of this web was 40%, and the average fiber diameter of the ultrafine fibers was 2.0 m when measured using an electron microscope. Next, using a device of the type shown in FIG.
The random web was placed on a wire mesh, and while suctioning from below at -35 degrees, a high-pressure water stream was continuously ejected from a number of orifices with a diameter of 0.10 to the entire surface of the sheet at a pressure of 20k9/carp. It was then similarly treated with a high-pressure water stream at a pressure of 30 k9/m. The nonwoven fabric thus obtained had a structure as shown in FIG. 3, and was extremely fulfilling. Its physical properties are shown below. high density
0.20 m/ground tensile strength
1.9k9/inhibited area boiling water shrinkage rate
20%, then 5% to the nonwoven fabric
The sample was impregnated with a polyvinyl alcohol aqueous solution to a coating weight of 15%, and then impregnated with a 10% DMF solution of polyurethane elastomer to a coating weight of 40%. Next, it was placed in a 30% DMF aqueous solution and left for 30 minutes to fully solidify the polyurethane, and when it was further immersed in 70 oo of hot water, it showed an area shrinkage of 15%. next,
After washing and drying, the surface of the resulting nonwoven fabric was brushed with sandpaper, resulting in a nubuck-like artificial leather that was soft, extremely full, and had a fine-grained surface. When the surface of this leather-like material was observed under a microscope, fuzz consisting of ultrafine fibers with an average fiber diameter of 21 m and a fluff length of 50 to 500 French m was observed.

Despite this short fluff, it had an elegant lighting effect, and was delicate, with no exposed polyurethane on the surface. The physical properties of this nonwoven fabric are shown below.

Weight: 200 yen/pillow thickness
0.7 leg tensile strength
2.5k9/enemy compression ratio
90% compression recovery rate
88% growth recovery rate 85
% Example 2 The steps of Example 1 were repeated.

However, among the melt blowing conditions, the gas pressure is 2.8
kg/, and polyethylene terephthalate was melt blown to obtain a random web with an average fiber diameter of 4.5 French meters and a basis weight of 200 mm. This was placed on a wire mesh, and the entire surface of the sheet was treated with high-pressure water at a pressure of 30k9/ground through a number of orifices with a diameter of 0.10 willow while suction was applied from below at -35°C. Then, when it was immersed in reduced water for 10 minutes to cause shrinkage, the area shrinkage rate was 70%. This nonwoven fabric structure was extremely delicate and full, and its physical properties were as follows. Qiao density
0.21 T/ground tensile strength
After drying the above non-woven fabric, it was impregnated with a 5% polyvinyl alcohol aqueous solution so that the amount of adhesion was 15%, and then 1 kg of polyurethane elastomer was applied.
A 5% DMF solution was impregnated to give a coating weight of 50%. Next, it was placed in a 30% DMF aqueous solution and left to stand for 30 minutes to fully solidify the polyurethane, and then the polyvinyl alcohol and DMF were removed from the whole house in warm water at 70°C and dried. Next, after washing and drying, the surface of the obtained nonwoven fabric was brushed with sandpaper, and an excellent artificial leather having a soft, full-feeling, and delicate surface was obtained. The physical properties of this nonwoven fabric structure were as follows. eye
200 yen/thickness
0.6 side tensile strength
2.7k9/pressurization ratio
90% compression recovery rate 8
7% elongation recovery rate 90% Example 3 Using the type of equipment shown in Figures 4 and 5, nylon 6 was heated at a paper mouth temperature of 315 degrees, a gas temperature of 360 degrees, and
Gas pressure 4.0 kg/c Fin and side fat discharge rate 0.1 m/m
Melt blowing was carried out under the conditions of in/orifice, and the paper was collected on a moving wire mesh at a collecting distance of 50 cm to obtain a random web consisting of ultrafine fibers with an average fiber diameter of 0.5 fm and a basis weight of 250 m.

The random web was then treated with a high pressure water jet in the same manner as in Example 1 using an apparatus of the type shown in FIG.
This nonwoven fabric farm structure had the following physical properties and was rich in sense of fulfillment.

Groove density 0.20mm/Ground tensile strength 1.5k9/Kitsuneji Example 1
Polyurethane was impregnated and coagulated using the same method as above.

Next, after washing and drying, the surface of the obtained nonwoven fabric was brushed with sandpaper, resulting in an extremely soft and full-bodied artificial leather with a finely fluffed surface. The physical properties of this nonwoven fabric were as follows. With eyes
250 evenings/strength
0.8 sail tensile strength 2
．． 0k9/Skin elongation recovery rate 90
% Compression rate 28% Compression recovery rate 87% Comparative Example 1 The same method as in Example 1 was repeated.

However, the average fiber diameter of the obtained polyethylene terephthalate ultrafine fibers is 8rm, and the basis weight of the random web is 8.
It was midnight. The artificial leather obtained by brushing the surface is rough and hard, and has a rough surface and a fluff length of 5.
When it was set to less than 00 French, the elegant lighting effect as in the present invention did not appear. Comparative example 2 parts by weight of nylon 6 and 4 as island components, polystyrene 6 as sea component
Sea-island fibers were obtained by melt spinning using parts by weight of .

This sea-island component is crimped using a pressing machine, and the length is 3
It was cut into 5 ribs and used as staples. This staple is made into a cross-laid web with a fabric weight of 80 mm using a loading machine and a cross layer, and a gauze-like polyester fiber with a fabric weight of 45 mm/strength 3M/24 is placed between the two sheets of this web.
A three-layer structure sheet was obtained by sandwiching a woven fabric consisting of f. Needle punch this sheet and add 50k
It was treated with 900 ml of high-pressure water jet to form a non-woven fabric, and then treated with chloroform to extract and remove the sea component styrene. The density of this fiber structure was 0.15 mm/ground and was coarse. Furthermore, this is impregnated with polyurethane and coagulated,
When the surface was raised, the obtained artificial leather lacked elasticity, the fluff was made of fibers, lacked a moist texture, and had a rough surface.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the structure of natural leather.
FIG. 2 is a schematic illustration showing the structure of artificial leather using Fiber East, FIG. 3 is a schematic illustration showing the structure of the nonwoven fabric used in the present invention, and FIG. 4 is a schematic illustration showing the structure of the nonwoven fabric used in the present invention. , is an explanatory diagram showing one embodiment of an apparatus used in a melt blowing process for producing melt-blown ultrafine fibers, and FIG. 5 is a cross-sectional explanatory diagram of one embodiment of an orifice used in the apparatus of FIG. 4, FIG. 6 is a scanning electron micrograph showing an example of the random web used in the present invention;
The figure is an explanatory view of one embodiment of the apparatus used for high-pressure fluid treatment used in the production of the nonwoven fabric of the present invention, and FIG. 8 is a model of one example of the artificial leather of the present invention obtained using the nonwoven fabric strip. It is an explanatory diagram. 1... Ultrafine fiber, 2... Fuzz, 2A... Textile East,
2B... Thick collagen fiber east, 3... Rubber-like elastic polymer, 3A... Erect hair layer, 3B... Fine fluff, 3C...
... Thick fluff, 5... Extruder, 6... Pipe, 7.
... Fibrous melt, 8... Random web, 9...
Screen, 10...loaf, 11...feeding loaf, 12...orifice, 13...slit, 13A...
・Drive low hood, 14...Screen, 15...Random web, 16...Pipe, 17...Orifice head, 18.
...Narrow orifice, 19...High pressure water flow, 20...Delivery. Figure 10 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1 A nonwoven fabric composed of three-dimensionally intertwined melt-blown microfibers that are substantially separated into single fibers, randomly distributed, and have an average fiber diameter of 0.1 to 5.0 μm. and a rubber-like elastic polymer interposed in the interstitial spaces of the nonwoven fabric, and having a surface covered with fluff made of single fibers of the ultrafine fibers.