JP2006299463A - Method for producing filament nonwoven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing filament nonwoven fabric excellent in surface homogeneity, manifesting high quality crease in applying to an artificial grain leather. <P>SOLUTION: In the method for producing filament nonwoven fabric, filament has structure dividable into at least two kinds of fibers immediately after spinning and at least a kind of fiber has heat shrinking property. The filament nonwoven fabric is produced in the method comprising directly collecting the filaments immediately after spinning, on a net and building-up and then entangling with a swinging type needling machine which swings in traveling direction and then subjecting to a mechanical dividing process and a hot-water shrinking process. The filament nonwoven fabric is preferably produced by continuously subjecting the filaments to the spinning, building-up, entangling, dividing, and shrinking process without temporarily winding the filaments, and the preferable fineness of the filaments after dividing is 0.5-0.001 dtex, and the preferable polymer comprising the filaments is polyester and polyamide. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a long-fiber non-woven fabric, and more particularly to a method for producing a long-fiber non-woven fabric having excellent surface uniformity that is optimal for artificial leather and the like.

  Unlike woven and knitted fabrics that are also composed of fibers, non-woven fabrics are widely used in industries because they are highly isotropic materials with little difference in strength and physical properties depending on the vertical and horizontal directions, and are highly productive. ing. However, in order to obtain a high-strength, high-quality final product such as artificial leather, it is necessary to increase the density of the nonwoven fabric. However, since the fiber arrangement is random, the density must be increased uniformly mechanically. Is difficult compared to woven and knitted fabrics.

  Therefore, conventionally, a method has been used in which the fibers are made into short fibers and crimped in advance to increase the entanglement density, or after the entanglement, the fibers are contracted in water to increase the density of the nonwoven fabric. (For example, Patent Document 1) However, in the case of a long-fiber non-woven fabric unlike a short-fiber non-woven fabric, because the fibers existing on the surface are continuous over a long distance instead of a short distance, the disturbance generated in the single fiber is There was a problem that the entire surface and the inside were adversely affected.

And especially when a smooth silver surface is given to the surface like artificial leather, the internal disturbance cannot be cheated like the product exposed on the surface, and the wrinkle quality when folded There was a problem that became very low.
WO99 / 23289 pamphlet

  The present invention has been made against the background of the above-mentioned problems of the prior art, and the object thereof is to provide a long-fiber non-woven fabric having excellent surface uniformity and particularly high quality of wrinkles when used for artificial leather with silver. There is.

  The production method of the present invention is a method for producing a long-fiber nonwoven fabric, wherein the long fiber immediately after spinning has a structure that can be divided into two or more types of fibers, and at least one type of fibers is a heat-shrinkable fiber. Yes, immediately after spinning the long fibers, collected on the net and laminated, then entangled with a swinging needle machine that swings in the direction of travel, then mechanically splitting and hot water shrinking And Furthermore, each step of spinning, laminating, entanglement, splitting, and shrinking is performed sequentially in sequence without being wound once, and the fineness after splitting of the long fibers is 0.5 to 0.001 dtex, The polymer constituting the long fiber is preferably polyester or polyamide.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method which is excellent in surface uniformity and can obtain the long fiber nonwoven fabric with the high quality of a crease | fold wrinkle at the time of using especially for a leather-like artificial leather is provided.

Hereinafter, embodiments of the present invention will be described in detail.
The present invention is a method for producing a long-fiber nonwoven fabric, wherein the long fiber immediately after spinning has a structure that can be divided into two or more types of fibers, and at least one type of fibers is essential to be heat-shrinkable. And

  The long fibers used in the present invention are fibers used as conventional artificial leather or synthetic leather, and synthetic fibers are preferable. Here, the long fiber means that a long fiber-like form is maintained without being cut at several centimeters like a short fiber, and is a sufficiently continuous fiber that is not cut after the polymer is spun. Say something.

  Examples of the two or more types of fibers constituting the long fiber include polyamide fibers such as nylon-6, nylon-66, nylon-610, nylon-11, nylon-12, polyethylene terephthalate, polytriethylene terephthalate, polybutylene terephthalate, Examples thereof include polyester fibers such as polypropylene terephthalate, polyethylene naphthalate, and copolymerized polyesters containing these as main components. The long fiber used in the present application is composed of two or more kinds of these fibers, and is a fiber having a bonded structure that can be divided, for example.

  And at least 1 type of fiber needs to have heat shrinkability. By using such heat-shrinkable fibers, the nonwoven fabric can be densified. Specific examples of the fiber having heat shrinkability preferably include, for example, polyethylene terephthalate, polytriethylene terephthalate, polybutylene terephthalate, or a copolyester containing these as a main component. In order to impart heat shrinkability, it is possible to take a technique such as adjusting the draw ratio and the drawing temperature during spinning, and it is particularly preferable to take means for adjusting the temperature and pressure of the ejector drawing immediately after spinning.

  Among such long fibers, it is particularly preferable that the polymers constituting the long fibers are polyester and polyamide. Further, it is preferable that the long fiber is a peeled split type composite fiber and becomes an ultrafine fiber after the fiber splitting. In the case of a split split type composite fiber composed of two or more kinds of polymers, when the thermal shrinkage rate of each fiber after splitting is different, it is more preferable because the inter-fiber void can be reduced during shrinkage.

  In order to obtain a high-quality nonwoven fabric, it is preferable that the fiber after the division is an ultrafine fiber, and the fineness of the fiber is preferably 0.5 to 0.001 dtex, and more preferably 0.3 to 0.08 dtex. It is preferable. If the fineness is too large, the texture of the nonwoven fabric or artificial leather obtained from the nonwoven fabric becomes hard, which is not preferable.

  Further, these fibers may be mixed with several kinds of fibers instead of single. It is also preferable that not only long fibers but also short fibers are included in part. Various textures can be taken by containing short fibers.

  In the production method of the present invention, the long fibers obtained by spinning the polymer in this manner are collected directly on the net and laminated. The spun fiber is stretched to make the strength and fineness appropriate, but it is preferable to stretch with an ejector. Moreover, it is also preferable as a fiber assembly composed of short fibers and long fibers by arranging short fibers in advance on the net. Unlike short fibers, long fiber nonwoven fabrics do not require crimping and cutting processes, and therefore can be a continuous process.

In order to control the weight of the fiber assembly, the net is collected while moving, but the weight is determined by the net speed and the amount of spun fibers. The basis weight in this step is preferably in the range of 20 to 60 g / m ² . If the amount is too large, variations tend to occur in the next layering process.If the amount is too small, not only is it too light and it is easily affected by the wind, but it is also necessary to increase the layering speed. Tend to be. In the next lamination step, it is preferable to employ a cross layer in order to make the fiber assembly uniform.

  Usually, in the manufacturing method of the long-fiber nonwoven fabric, in order to adjust the spinning speed of the fiber and the line speed of the subsequent process, the fiber assembly is once wound up in the collecting process and the laminating process. It is also a preferable aspect to pass through the process continuously without winding. The fiber assembly at this stage has very little entanglement and is very delicate, as can be seen from the fact that it becomes non-uniform even by the wind in the process. In addition, while the non-uniformity of the short fiber is reduced by the movement of the fiber, the non-woven fabric composed of the long fiber has a short fiber non-woven fabric and a long fiber non-woven fabric in which the disturbance of the single fiber affects the entire non-woven fabric. There are also differences. In the production method of the present invention, the quality of the long-fiber nonwoven fabric can be further improved by eliminating the winding and unwinding steps.

  Next, in the production method of the present invention, it is essential to interlace the laminated fiber assembly with a swinging needle machine that swings in the traveling direction. Here, the oscillating needle machine is one in which the needle needle moves in the advancing direction so that the needle needle entry position and the needle withdrawal position coincide.

  After spinning, the laminate of fiber aggregates collected on the net is a stack of fiber aggregates in each layer with a small basis weight and minute force, such as wind in the process or shearing force when entering the needle rocker. Although the alignment position tends to shift, in the present invention, the shift can be reduced by using a swing type needle machine. In particular, the effect of the present invention is remarkable when the machine speed in the traveling direction of the fiber assembly per one stroke of the movement of entering and withdrawing the needle is high. In the case of a conventional nonwoven fabric composed of short fibers, the effect of the travel distance of the fiber assembly per one needle needle stroke was not a problem because the fiber length was short. Since the fibers are aligned and oriented in the machine direction as if they were washed with a comb, it is possible to prevent the generation of large wrinkles in the inner and outer folds, especially in the case of artificial leather. It has become possible. Furthermore, the longitudinal elongation value and the transverse elongation value of the fiber assembly after entanglement can be made equal.

  In the present invention, mechanical division is then performed. This mechanical division treatment is preferably performed by a mechanical divider installed in a series of continuous lines, and the fibers constituting the entangled fiber assembly are divided. Here, the mechanical division is a technique for dividing long fibers by applying mechanical force such as vibration, hitting and shearing to the nonwoven fabric. In this case as well, it is preferable to treat as a series of steps without winding, but for that purpose, it is preferable not to promote the division by an organic solvent or an organic compound. By omitting such a division promoting process, facilities such as an explosion-proof device and a solvent recovery device are not required. Although there is a difference in the easiness of division depending on the type and production method of the bonded fibers, it is basically preferable in terms of quality to adopt a divider that combines vibration and shear on the basis of tapping.

  The fiber assembly into which the fibers are divided passes through a process of continuously performing hot water shrinkage. In the case of a nonwoven fabric, unlike a knitted or knitted fabric and the like, deformation due to external force is large, so it is necessary to continuously put it into the hot water shrinking process without winding up. In particular, the present invention uses heat-shrinkable fibers, and slight disturbance of long fibers is emphasized in the shrinking process, but the disturbance can be extremely reduced in the manufacturing method of the present invention.

  As a preferred embodiment, when the long-fiber nonwoven fabric is immersed and swimming in water, the nonwoven fabric can be uniformly contracted in all directions by swimming the nonwoven fabric using the buoyancy of water during immersion. The temperature of water in the hot water shrinking step is preferably in the range of 50 to 95 ° C for densifying the nonwoven fabric, and particularly preferably in the range of 65 to 75 ° C. When the temperature is too low, shrinkage hardly occurs, and when the temperature is high, a large amount of water evaporates, which tends to increase energy loss. The processing time is suitably about 30 to 60 seconds.

The shrinkage rate of the nonwoven fabric is preferably 15 to 60%. More preferably, it is 30 to 45%. If the shrinkage rate is too low, the nonwoven fabric has a low density, and high-quality artificial leather or the like cannot be obtained. Further, when the shrinkage rate is too high, the degree of freedom of the fiber with respect to bending or the like is lost, and for example, it becomes too hard when an artificial leather is used. In order for the nonwoven fabric to obtain isotropic properties, the difference in shrinkage between the longitudinal direction and the transverse direction is preferably within 80%. These shrinkage ratios can be adjusted by the shrinkage ratio, composition ratio, entanglement degree, temperature conditions in the shrinking process, tension, and the like of the shrinkable fibers in the nonwoven fabric. The apparent density of the nonwoven fabric after shrinkage is preferably 0.2 to 0.5 g / cm ³ , more preferably 0.22 to 0.45 g / cm ³ .

  When swimming underwater, it is preferable to capture the non-woven fabric on a water-permeable support as it is. The non-woven fabric that has been shrunk has buoyancy in the water, but the load in the vertical and horizontal directions, particularly in the machine direction of the manufacturing process, can be reduced to almost zero by pulling it out from the water as it is. As the water-permeable support, any material can be used as long as it can permeate excess water and support and move the nonwoven fabric. For example, a belt made of a net-like metal such as a net conveyor or a synthetic resin can be used. Preferably used. Furthermore, it is preferable to cool the nonwoven fabric on the support. For example, it can be quickly cooled by spraying low temperature water of 30 degrees or less. By doing in this way, the expansion-contraction on the support body of a nonwoven fabric can be suppressed, and generation | occurrence | production of the new stress on a support body can be suppressed. Moreover, since the nonwoven fabric temperature falls, the influence of the stress in a subsequent process can be suppressed to the minimum.

  Furthermore, it is preferable to be a production method in which water removal is continuously performed after the hot water shrinking step. Therefore, the support for capturing the nonwoven fabric is preferably water permeable. Thus, by removing moisture in the nonwoven fabric, the weight of the nonwoven fabric can be reduced and the tension in the process can be reduced. As a method of removing moisture, a method of squeezing with mangle can be used, but in order to increase the dewatering efficiency and maintain the soft texture of the nonwoven fabric, it is preferable to perform dewatering under reduced pressure. At this time, by using a highly breathable material for the support, the air flow rate in the thickness direction of the nonwoven fabric can be increased and the dehydration can be further promoted. Since the non-woven fabric after dehydration becomes light, it can be easily moved to the next process with less tension. In order to completely remove moisture, it is preferable to perform heat drying after dehydration.

By the way, when the nonwoven fabric in water is pulled out from the water as it is, it contains 5 to 8 times the weight of the nonwoven fabric fiber because it contains water. In particular, when the temperature of the water is high, the temperature of the non-woven fabric and the water aggregate does not decrease easily, and a phenomenon occurs in which the non-woven fabric stretches even with a slight tension. The physical properties such as degree are greatly different. For example, in the case of a non-woven fabric with a fiber weight of 1.4 m and a weight of 300 g / m ² , the load applied to the top of the non-woven fabric when it is pulled out from water to a height of 1 m is 300 g / m ² × 1.4 m × 1 m × 6 = 2520 g. This corresponds to a load of 1.8 kg weight per 1 m of nonwoven fabric.

  The long-fiber non-woven fabric obtained by such a manufacturing method is surprisingly improved in uniformity because the needle hole is not displaced in the entanglement process, and therefore has an excellent texture. In addition, it becomes a high-quality nonwoven fabric with no anisotropy in the vertical and horizontal directions and excellent in isotropy, and can prevent the increase in longitudinal fiber orientation and longitudinal fiber density unevenness, which is the machine direction during production, In particular, it can be suitably used for artificial leather and the like.

  A conventionally known method may be used to process the nonwoven fabric into artificial leather. For example, a polymer elastic body solution such as polyurethane dissolved in an organic solvent, or a polymer elastic body water dispersion such as polyurethane dispersed in water. Etc. can be impregnated into a non-woven fabric and dried with or without coagulation in a wet or dry manner to form a base material for artificial leather comprising fibers and a polymer elastic body. The base material can be brushed after drying and formed into a suede-like artificial leather by dyeing, or a colored film or the like of a polymer elastic body can be formed on the surface to give a silver-like artificial leather.

  The artificial leather obtained in this way is of excellent quality with excellent isotropic properties, and in particular, when it is made of artificial leather with a silver tone, it is bent inward and outward in the vertical direction as well as in the horizontal direction. In both cases, no large wrinkles are generated, only fine wrinkles finely dispersed on the surface are generated, and even when the bending is released, a high quality product that does not leave the wrinkles is obtained. The obtained artificial leather is used for sports shoes, shoes for women's and men's shoes, various ball applications for competition, industrial materials such as furniture, vehicles, interior materials, interior materials, bookbinding for notebooks and notebooks, clothing, etc. It can be preferably used for applications.

Hereinafter, the present invention will be described more specifically with reference to examples.
In addition, each item in an Example was measured with the following method.

(1) the area before shrinkage shrinkage and _{S 1.} Area after shrinkage is referred to as S _2. The shrinkage rate is obtained by the following calculation.
Shrinkage rate (%) = (S ₁ −S ₂ ) × 100 / S ₁

(2) Flexibility The degree of fiber orientation and density unevenness was evaluated by the flexibility in the vertical and horizontal directions.
A test piece of 25 mm × 90 mm in flexibility is prepared, and the lower 20 mm in the longitudinal direction is vertically held by a holder, and the other part of the test piece is placed on the measuring part of the U gauge at a height of 20 mm from the holder. Slide the holder while bending the test piece so that the center part at a position of 20 mm from the tip of one end is fixed, and read the stress after 5 minutes from the recorder to fix the stress per 1 cm width. It was converted into flexibility. The unit is expressed in g / cm.

[Example 1]
(Creation of long fiber nonwoven fabric)
Nylon-6 (intrinsic viscosity 1.1 in m-cresol) dried at 120 ° C. was fed to an extruder and melted. Separately dried at 160 ° C., polyethylene terephthalate (an intrinsic viscosity of 0.64 in o-chlorophenol) was melted with an extruder separate from the foregoing.

  Subsequently, the nylon-6 mixture melt flow was introduced into a spin block maintained at 275 ° C. at a conduit polymer temperature of 250 ° C., the polyethylene terephthalate melt flow at 300 ° C., and a rectangular shape having hollow forming discharge holes in a lattice arrangement. The two polymer melt flows are combined using a spinneret, combined and discharged at a rate of 2 g / min. / Hole, and an air pressure of 0.35 MPa (spinning speed converted from the discharge rate and composite fiber fineness is about 4860 m / min). Towed at high speed (ejector stretching).

  The pulled composite fiber is subjected to a high voltage application treatment at −30 kV, collided with a dispersion plate together with an air flow and opened, and a split split type composite fiber having a 16-split multi-layer laminating section (parent yarn fineness 4.4 dtex). ) Was collected on a net conveyor with a width of 1 m to obtain a web. Subsequently, the collected web was passed through a pair of upper and lower embossed calender rolls heated to 100 ° C. to obtain a heat bonded web.

After that, the heat-bonded web collected without winding was superposed with a cross layer so as to have a width of 170 cm, and then a rocking needle machine equipped with a 1 barb needle was used with a pitch of 3 mm and a stroke number of 1200 times / The entanglement process was performed by swinging the needle so that the relative position of the needle on the nonwoven fabric was not shifted when the needle entered and withdrawn the needle under the condition of 1200 penetrate / cm ² . Next, separation treatment was performed with a striking type grinder to obtain a pre-shrinking ultrafine fiber aggregate having a basis weight of 210 g / m ² and a width of 170 cm.

  Next, this fiber assembly was immersed in hot water at 70 ° C. for 60 seconds to be shrunk, collected on a net conveyor having a width of 190 cm, and pulled out from the hot water. The shrinkage at this time was 79 in the vertical direction with respect to the length 100 before shrinkage, 76 in the horizontal direction with respect to the length 100 before shrinkage, and the area shrinkage rate was 40%. In addition, the water content at this time was 460%.

Next, 13 ° C cold water is sprayed on the net conveyor to cool it, and then moisture is removed by a slit-type vacuum dehydrator located on the back side of the net conveyor, followed by drying with a hot air dryer at a moisture content of 120%. Got. The obtained long-fiber nonwoven fabric has a basis weight of 350 g / m ² , a thickness of 1.0 mm, an apparent density of 0.35 g / cm ³ , and a width of 129 cm. It was a non-woven fabric with a sense of density.

  When the cross section was observed with an electron microscope, the cross section of the nonwoven fabric observed from the vertical direction and the horizontal direction was almost the same, and the cut surface and the side surface of the fiber existed randomly. The longitudinal strength was uniform with a breaking strength of 185 N / cm and a breaking elongation of 95%, and the transverse strength was uniform with a breaking strength of 177 N / cm and a breaking elongation of 107%. In addition, since it is manufactured in a series of continuous lines from spinning, it can be produced in a shorter time compared to the conventional method of manufacturing with a divided line, and the quality of the fibers is also disturbed due to partial pulling of the long fibers. No long fiber nonwoven fabric with excellent texture.

(Creation of base material for artificial leather)
The obtained long fiber non-woven fabric was continuously impregnated with a 9% dispersion of a heat-sensitive coagulation-type aqueous polyurethane (heat-sensitive coagulation temperature 60 ° C), and the excess dispersion on the surface was scraped off to form a heat-sensitive coagulation box. Coagulation was carried out. The heat-sensitive coagulation box has a water tank at the bottom where there is no fiber assembly passage, and 0.29 MPa (3 kgf / cm ² ) of pressurized steam is supplied from two pipes at a depth of 200 mm in the water tank. Was. There is a hole in each pipe, and steam is supplied in parallel to the water surface from each hole in the hot water, and in the heat-sensitive coagulation box, the upper part is heated by boiling water in the water tank installed at the bottom. The atmospheric temperature was controlled to 92 ° C. and the relative humidity was controlled to 99%. Further, the outlet of the heat-sensitive coagulation box was sealed with hot water at 97 ° C., and the cloth path was set so that the impregnated non-woven fabric passed through the hot water tank of this sealed portion. The long-fiber nonwoven fabric impregnated with the dispersion is solidified in a 97 ° C hot water bath that seals its outlet by exposing it to a coagulation box with an atmospheric temperature of 92 ° C and a relative humidity of 99% for 1 minute. For 1 minute. Due to the solidification in the heat sensitive box, no dissolution of polyurethane was observed in the hot water tank. Further, there was no color unevenness on the substrate, and no defects on the spots were observed. Then, after cooling, it was squeezed with a mangle roll and dried with a hot air dryer at 110 ° C. to obtain an artificial leather substrate having a thickness of 1.0 mm and an apparent density of 0.45 g / cm ³ . The fiber / polyurethane ratio of the obtained artificial leather base was 100: 30 by weight, and the cross section was observed with an electron microscope. The polyurethane was uniformly distributed in the thickness direction of the fiber composite.

(Making artificial leather)
On the other hand, on a release paper (R53 manufactured by Lintec Corporation), a thickening agent and 5 parts of a coloring agent are added to 100 parts of a 33% aqueous dispersion of polyurethane while stirring, and the mixture is adjusted to a viscosity of 8000 mPa · s. The film was coated at 90 g / m ² and dried at a temperature of 70 ° C. for 2 minutes and at 110 ° C. for 2 minutes. Furthermore, 150 g of a prepared liquid prepared by mixing 100 parts of a water-dispersible polyurethane adhesive (45% concentration), 5 parts of a colorant (black), and a thickener on the surface to adjust the viscosity to 5000 mPa · s. / M ² . Subsequently, after drying for 2 minutes at a temperature of 90 ° C., the artificial leather substrate obtained above was superposed and passed through a roll with a gap of 0.6 mm on the surface of a heated cylinder at a temperature of 110 ° C. and pressure bonded. Then, after leaving it for 2 days in the atmosphere of 60 degreeC temperature, the release paper was peeled off and the artificial leather was obtained.

  The obtained artificial leather has a longitudinal flexibility of 0.87 g / cm and a transverse flexibility of 0.81 g / cm. The longitudinal strength is 192 N / cm breaking strength, 90% breaking elongation, The transverse strength was uniform with a breaking strength of 183 N / cm and a breaking elongation of 104%. In both the vertical and horizontal directions, even when the surface was bent inward, no large wrinkles were generated.

  Soccer shoes and soccer balls were created using this artificial leather. The soccer shoes, when worn, became small wrinkles without generating large wrinkles on the toes, and were very similar to natural leather wrinkles. The soccer ball was deflated and folded into a hemisphere, and after one month, the air was put back into a sphere but no wrinkle marks remained.

[Comparative Example 1]
(Creation of long fiber nonwoven fabric)
At the time of entanglement processing, a needle machine in which the needle needle reciprocates at the same position as the conventional type instead of using an oscillating needle machine, with a pitch of 3 mm, a stroke number of 1200 times / minute, and a penetrate number of 1200 pieces / cm ² The long fiber nonwoven fabric was created under the same conditions as in Example 1 except that the entanglement process was performed. The obtained long fiber nonwoven fabric was a nonwoven fabric with a basis weight of 350 g / m ² , a thickness of 1.0 mm, an apparent density of 0.35 g / cm ³ , and a width of 129 cm, and a high density and fullness.

  However, when the cross section was observed with an electron microscope, the cross section of the non-woven fabric observed from the longitudinal direction had an overwhelmingly large number of fiber cut surfaces, and the number of fiber side surfaces was sparse. On the other hand, in the nonwoven fabric cross section observed from the lateral direction, on the contrary, the number of cut surfaces of fibers was sparse, and the number of fiber side surfaces was overwhelmingly large. In addition, although the tensile strength in the longitudinal direction is rupture strength 212 N / cm and the rupture elongation is 76%, the tensile strength in the transverse direction is not uniform such as rupture strength 154 N / cm and rupture elongation 129%. Met.

(Creation of base material for artificial leather)
A substrate for artificial leather was prepared in the same manner as in Example 1 except that the obtained long fiber nonwoven fabric was used, and an artificial leather substrate having a thickness of 1.0 mm and an apparent density of 0.45 g / cm ³ was obtained. The fiber / polyurethane ratio of the resulting artificial leather substrate was 100: 30 by weight.

(Making artificial leather)
Using the obtained artificial leather substrate, silver-added artificial leather was obtained in the same manner as in Example 1.
The obtained artificial leather has a longitudinal flexibility of 1.21 g / cm and a lateral flexibility of 0.76 g / cm. The longitudinal strength is 219 N / cm breaking strength, 74% breaking elongation, The transverse strength was found to be a breaking strength of 161 N / cm and a breaking elongation of 127%.

  When the cross section was observed with an electron microscope, the cross section of the nonwoven fabric observed from the longitudinal direction was overwhelmingly present with the cut surfaces of the fibers, and the number of fiber side surfaces was sparse. Further, no large creases were generated even when bent in the lateral direction with the surface inward, but large creases were also generated when bent in the vertical direction with the surface inward.

  Soccer shoes and soccer balls were created using this artificial leather. When soccer shoes were worn, large wrinkles were generated on the toes, there were few small wrinkles, and the difference from natural leather was obvious. Also, the soccer ball was deflated and folded into a hemisphere, and after one month it was aired and returned to a sphere, but wrinkle marks remained and the product value was low.

Claims (5)

  A method for producing a long-fiber non-woven fabric, wherein a long fiber immediately after spinning has a structure that can be divided into two or more types of fibers, and at least one type of fiber has heat shrinkability, and the long fibers are spun Immediately after collecting and laminating on a net, production of a long-fiber nonwoven fabric characterized in that it is entangled with a swing type needle machine that swings in the direction of travel, then mechanically divided and subjected to hot water shrinkage Method.   The method for producing a long-fiber non-woven fabric according to claim 1, wherein the steps of spinning, laminating, entanglement, division, and shrinking are successively performed in order without winding.   The method for producing a long-fiber nonwoven fabric according to claim 1 or 2, wherein the fineness of the long fibers after division is 0.5 to 0.001 dtex.   The method for producing a long-fiber nonwoven fabric according to any one of claims 1 to 3, wherein the polymers constituting the long fibers are polyester and polyamide. The density of the nonwoven fabric after the process to shrink | contract is 0.2-0.5 g / cm < ³ >, The manufacturing method of the long fiber nonwoven fabric of any one of Claims 1-4.