JPH0360945B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention has high strength, flexibility, and excellent abrasion resistance.
The present invention relates to a thin artificial leather sheet having drapability and a method for producing the same. [Prior Art] Many artificial leather technologies have been created since the suede-like artificial leather "Ecsaine" (registered trademark of Toray Industries, Inc.) was introduced to the world. Humankind's demands are endless, and there is a demand for thinner, stronger, more flexible, more abrasion resistant, and more highly colored leather-like materials. We have already provided several technologies to meet these demands. For example, in the past, cationic dyeable polyester had high coloring properties, but its strength significantly decreased when it was made into ultra-fine fibers, making it unsuitable for use in artificial leather. As described above, by combining special polymers developed by applying polymer interlayer array fiber technology, we have provided highly pigmented suede-like artificial leather that could never be achieved with natural leather. In addition, by laminating and entangling the highly twisted knitted fabric and the ultrafine fiber sheet with high coloring properties,
We have provided a suede-like artificial leather technology that is flexible, highly colored, has high strength, and has low elongation. These technologies maintain a good balance of properties such as high strength, low elongation, flexibility, and high color development, and have been effective to a certain extent in meeting the demands of society. However, with the demand for thinner artificial leather, the balance between thinness and physical properties, especially abrasion resistance, was not sufficient, and further improvements were needed. [Problems to be Solved by the Invention] The present invention solves the drawback of reduced abrasion resistance that could not be covered by conventional techniques when thinning artificial leather, and improves strength elongation, flexibility, The object of the present invention is to provide a thin artificial leather sheet that has well-balanced properties that affect commercial value, such as drapability and high color development, and a method for producing the same. [Means for Solving the Problems] The present inventors have finally arrived at the present invention as a result of intensive research to solve the above problems. The gist of the invention is as follows. (1) A composite sheet composed of a highly twisted knitted fabric, ultrafine elastic fibers of 1.0 denier or less, and ultrafine inelastic fibers of 0.8 denier or less and a main length of 20 mm or more, which It has a structure in which an ultrafine elastic fiber entangled sheet is mainly interposed between the inelastic fiber entangled sheet, and these are tightly intertwined as if they were an inseparable body, and the ultrafine elastic fibers are partially adhered. A flexible thin artificial leather sheet with excellent abrasion resistance. (2) An ultrafine elastic fiber sheet of 1.0 denier or less is layered on a highly twisted knitted fabric, and then an ultrafine inelastic fiber sheet of 0.8 denier or less and with a main length of 20 mm or more is laminated on top of the sheet and entangled. After that, if necessary, the highly twisted knitted fabric is subjected to latent torque unwinding treatment, and then ultrafine elastic fibers are partially fused. Method for manufacturing artificial leather sheets. The present invention will be explained in detail below. As an example of a specific means for achieving the present invention, first, in order to obtain high strength with a thinner sheet, a highly twisted knitted fabric or a highly twisted fabric is used, and then a highly twisted fabric is used to improve the abrasion resistance. A sheet of ultra-fine elastic fibers of 1.0 denier or less is placed to give a moderate repulsion force, and on top of that, a sheet of 0.8 denier or less is placed to give flexibility, drapability, and a suede-like appearance. , and the main length is 20mm
The above sheets of ultrafine inelastic fibers are laminated, and then needle punched to form an inseparable integral structure by sufficiently increasing the entanglement of the sheets themselves and the intertwining of the sheets and the knitted fabric. After that, if necessary, the highly twisted knitted fabric is subjected to a latent torque unwinding process, and then the ultrafine elastic fibers are partially fused to form a highly twisted knitted fabric/
The main idea is to create a structure in which ultrafine elastic fibers and ultrafine inelastic fibers are inseparably intertwined. This will be explained more specifically below. The number of twists of the yarns constituting the strongly twisted knitted fabric used in the present invention is preferably 500 T/m or more.
1000T/m or more, most preferably 1500T/m
That's all. If the number of twists is less than 500 T/m, the tightness of the single threads constituting the thread is insufficient, so the thread or single thread gets caught on the barb of the needle during needle punching, causing the thread to be cut or damaged. As a result, the structure of the knitted fabric is destroyed, and as the number of punches increases, the strength of the knitted fabric decreases significantly, resulting in a significant decrease in the strength of the fabric structure as a whole, and as a result, it becomes difficult to contribute to low elongation. . Furthermore, due to the destruction of the knitted fabric, the nonwoven fabric web and the threads or single yarns of the destroyed knitted fabric become entangled, and the degree of freedom is reduced due to the anchor effect, resulting in a stiff fabric structure as a whole. As a result, the broken ends of the fibers constituting the knitted fabric are exposed on the surface, significantly impairing the touch appearance. Polymers used in highly twisted knitted fabrics include polyethylene terephthalate or its copolymers, polybutylene terephthalate or its copolymers, polyamides such as nylon 6, 12, 66, and 610, polyethylene, polypropylene, and polyolefins. and acrylic polymers. One or more of these may be applied. Among these, polyethylene terephthalate, polybutylene terephthalate, and nylon 6 and 66 are particularly preferably used. In addition, the highly twisted knitted fabric is a finely woven fiber (suggests a composite fiber that can be made extremely fine by removing at least one component with a solvent or hot water, or by thinning treatment such as alkali reduction treatment or fibrillation treatment).
When using, the fiber-forming polymer is
Polyethylene terephthalate and its copolymers, polybutylene terephthalate and its copolymers, polyamides represented by nylon 6, 12, 66, 610, etc., hot water soluble polyester, hot water soluble polyamide, polyethylene, polypropylene , polystyrene, polyolefins, acrylic polymers, polyvinyl alcohol, and the like. Among these, it is a composite fiber made by combining at least two or more polymer components. The shape of the fiber cross section is not particularly limited. For example, 5
- Fibers made of mutually arranged polymers such as sodium sulfoisophthalate copolymerized polyester/polystyrene, polyethylene terephthalate/polystyrene, polyethylene terephthalate/hot water soluble polyester, core component being polyethylene terephthalate/
Core-sheath type composite fibers in which the sheath component is made of 5-sodium sulfoisophthalate copolymerized polyester, hot water soluble polyester/polystyrene, or chrysanthemum-like composite fibers made of polyester/polyamide are preferably used. These can be selected as appropriate depending on the purpose. The flexibility can be further improved by thinning treatment and creating an ultra-fine strong twist knit. The important point is to use a highly twisted knitted fabric that has never been seen before, and the cross-sectional shape of the fibers and the combination of polymers will vary depending on the target final product.
It is not particularly limited. In this case, even if the number of twists is too large, the removed components of the attenuated fibers will be destroyed, and even the ultrafine fibers will be cut during needle punching, making it impossible to obtain a product with the high strength that is the aim of the present invention.
Furthermore, if the number of twists is too large, the fibers will become too stiff,
It is unfavorable from the viewpoint of softening the texture and entanglement.
4000T/m or less is preferable. Furthermore, the fibers constituting the highly twisted knitted fabric may be a doped polymer. For example, it may be a mixture of polyester/carbon black or a mixture of other organic or inorganic pigments. These highly twisted knitted fabrics are preferably combined in consideration of the dyeability of the ultrafine inelastic fibers used in the surface layer. The type of strongly twisted yarn used is not particularly limited, and may include filament yarn, spun yarn, innovative spun yarn, filament yarn/spun yarn, and the like. The basis weight of the highly twisted knitted fabric is preferably in the range of 20 to 200 g/ ^m2 , most preferably 30 to 150 g/m2.
g/m ² range. When the basis weight is less than 20g/ ^m2 , the form of the knitted fabric becomes extremely loose.
When it is inserted into the middle layer or layered on the surface, wrinkles occur, making it difficult to spread it out evenly. In addition, if the basis weight exceeds 200 g/ ^m2 , the knitted fabric structure becomes dense, and the penetration of the nonwoven sheet during needle punching is insufficient, resulting in high entanglement of the nonwoven sheet, making it difficult to create an inseparable and integrated structure. becomes difficult. The types of high-twist knitted fabrics include warp knitting, weft knitting represented by tricot knitting, lace knitting, and various knitted fabrics based on these knitting methods, as well as plain weaving, twill weaving, satin weaving, and those weaving methods. It is not particularly limited to various types of knitted fabrics. Among these woven fabrics, those using strongly twisted yarns at least in either the warp or the weft are preferable, and particularly preferable are the woven fabrics using highly twisted yarns in both the warp and the weft. If you use highly twisted yarn on either the warp or weft side, plant the needle so that the barb of the needle faces the highly twisted yarn and punch it. In addition, in the case of highly twisted yarn both warp and width, fiber damage can be greatly suppressed by punching with the barbs oriented at 45 degrees to each side.
Furthermore, SZ twist 1-1, 2-2, 4 as weft
-It is best to use alternate yarns such as 4 or 2 (or Z) single-twist yarns. When using these yarns with different driving conditions, it is possible to create a natural-looking grained or lily-like appearance by applying latent torque unwinding treatment after needle punching and utilizing the torque restoring force of the highly twisted yarn. At the same time, product flexibility is often greatly improved. The term "latent torque unwinding treatment" as used herein means unraveling the latent torque of the highly twisted yarn by subjecting the highly twisted knitted fabric to hot water, steam, or dry heat treatment. In another case, by needle punching using a knitted fabric that has been made to develop torque in advance,
In some cases, the elongation of the knitted fabric is substantially increased and there is a reinforcing effect (reduced breakage of the knitted fabric fibers). Which one to choose may be determined as appropriate depending on the purpose. The yarn used for knitting fabrics can be changed as appropriate depending on the purpose, but a standard denier is 30 to 300 denier. The thinner the thread, the better in terms of uniformity, but if it is too thin, it will catch on the barb too tightly and be easily damaged. Also, if it is too thick, there will be no escape when the tip of the needle hits the thread, which is undesirable because the fibers are likely to break.
The most preferable range for the balance between the fiber integration effect as a strongly twisted yarn and the thickness is 50 denier to 150 denier. In particular, by using highly twisted yarn, the fibers are less likely to get caught in the barbs, and even if they are, they tend to come off easily.
This results in a damage reduction effect that was previously unanticipated. Therefore, the needle resistance is small, and the impact and load on the punch machine are small, making it possible to use high-density knitted fabrics. For example, 40 gauge for knitted fabrics,
There is no problem with 45 gauge, etc., and it is also possible to use woven fabrics with a warp + width weave density of 120 threads/in or more, and in some cases, 300 threads/in or more. Rather, it is often preferable to use such a high-density woven fabric because it can achieve high entanglement and high strength. The present invention can be said to be truly epoch-making as it overcomes the conventional limitations on the use of such high-density fabrics. The inseparable integral structure here refers to, for example, ultra-fine inelastic fibers and ultra-fine elastic fibers that enter the tissue of knitted fabrics and are not only randomly intertwined, but also that the ultra-fine fibers are intertwined with each other while maintaining their shape. This refers to a structure in which the knitted fabric and the ultrafine fiber sheet do not separate even if they are peeled under considerable stress, and when the stress becomes even stronger, the structure is so entangled that tissue destruction of the leather pattern occurs rather than peeling. This structure has a significant effect on improving wear resistance and strength/elongation properties. The ultrafine inelastic fibers used in the present invention include:
Polyethylene terephthalate and copolymers mainly composed of it, polybutylene terephthalate and copolymers mainly composed of it, nylon 6, 12,
Examples include polyamides such as 66 and 610, polypropylene, polyolefins, and acrylic polymers. Among these, polyethylene terephthalate and copolymers mainly composed of it, polybutylene terephthalate and copolymers mainly composed thereof, and polyamides are preferably used from the viewpoint of the physical properties and practical performance of the product. As means for obtaining these ultrafine inelastic fibers, known ultrafine spinning techniques and composite spinning techniques may be applied, and there are no particular limitations. When forming microfibers into sheets, for example, when using cards or cross wrappers, taking into consideration fiber damage, process stability, etc.
It can be said that composite fibers are preferable. The thickness of these ultrafine inelastic fibers is preferably 0.8 denier or less in order to improve the performance as a leather pattern, ie, flexibility, feel, appearance quality, strength characteristics, etc. When creating a nonwoven fabric using these fiber sheets, a card cloth slapping device is generally used. At this time, if the fiber length is too short, the degree of line drop will increase and it will be difficult to produce a sheet with uniform basis weight. It also becomes a cost increase factor. Furthermore, insufficient intertwining of fibers within the nonwoven fabric occurs. Therefore, in order to avoid such problems, the fiber length must be 20 mm or more. In the cross section of the leather pattern of the present invention, the ultrafine elastic fibers mainly interposed between the knitted fabric and the ultrafine inelastic fiber sheet layer are mainly thermoplastic polyurethanes. The thickness of the ultrafine elastic fiber used in the present invention is preferably 1.0 denier or less. If it is more than this, the ultrafine elastic fibers and the strongly twisted knitted fabric will not be sufficiently entangled during the entanglement treatment, resulting in a decrease in abrasion resistance, which is not preferable. Thermoplastic polyurethane is synthesized from a polyol, an organic diisocyanate, and a chain extender. A low melting point polyol having a molecular weight of usually 500 to 5000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polylactone, dihydroxy polycarbonate, dihydroxy polyester amide, and block copolymers thereof, and an organic diisocyanate having a molecular weight of 500 or less, such as, Tolylene diisocyanate, P,P'-diphenylmethane diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, 1,5-naphthylene diisocyanate, etc. and a chain extender, e.g.
Polymers obtained by reacting glycols, hydrazine, diamines, etc. with a molecular weight of 500 or less. Particularly good among these polymers are polytetramethylene glycol, polytetramethylene glycol,
Or a polymer using polytetramethylene glycol, polycaprolactone or polybutylene adipate. As the organic diisocyanate, P,P'-diphenylmethane diisocyanate is preferred. Glycols are preferred as chain extenders, and P,P'-bishydroxyethoxybenzene and 1,4-butanediol are preferred. Among polymers obtained from these combinations, ester polyurethanes are preferred in consideration of heat resistance. Substantially interposing the thermoplastic ultrafine elastic fibers of 1.0 denier or less used in the present invention between the strongly twisted knitted fabric and the ultrafine inelastic fibers improves the abrasion resistance of the present invention, and This is an important point in imparting flexibility and drapability. Conventional techniques in which inelastic fibers are laminated on a highly twisted knitted fabric, treated with entanglement, and then impregnated with a binder, particularly DMF-based polyurethane, are far inferior in abrasion resistance. In other words, when the ultrafine fibers penetrating the highly twisted knitted fabric are entangled by the needle punch method, the pattern of the needle board becomes the penetrating pattern of the ultrafine fibers, and there is a gap between the highly twisted knitted fabric and the non-penetrating ultrafine fiber layer. A space is created in the space, and the amount of binder that adheres there is smaller than the amount of binder that adheres to the ultrafine fiber entangled layer and the highly twisted knitted fabric layer, and when the surface is abraded, the ultrafine fibers in the non-adhered area are pulled. It is estimated that the abrasion resistance will be reduced. This tendency becomes more pronounced as the sheet becomes thinner. Therefore, in the prior art, the only method available was to increase the binder concentration. Naturally, it became difficult to achieve a balance between flexibility and flexibility, and we had no choice but to develop products with limited uses. However, according to the method of the present invention, ultrafine elastic fibers are evenly present even in the non-entangled portions of the highly twisted knitted fabric and the ultrafine inelastic fibers, where binder has been substantially difficult to exist in the past, and the highly twisted knitted fabric is It does not exist as if it were coated on the surface of the fibers, but it also entangles with the ultra-fine inelastic fibers, and the entangled portion is further strengthened by partial fusion treatment, resulting in improved wear resistance. It is estimated that there is. In the method of impregnating the sheet with a binder, the adhesive distribution of the binder occurs, and when the sheet is ground to obtain a thin sheet, the binder portion is removed and the abrasion resistance is extremely reduced. According to the method of the present invention, even when a thin sheet is made, most of the ultra-fine elastic fibers that replace the conventional binder remain, and the three laminated fibers form an ideal intertwined structure, allowing each fiber to perform its role satisfactorily. The result is a well-balanced product for thin artificial leather. In the prior art, for example, in the method disclosed in Japanese Patent Publication No. 61-6911, the knitted fabric used is a coarse double-sided knitted fabric or a low-density plain woven fabric. Knitted fabrics are broken and damaged by needle punching, making it difficult to obtain a high degree of three-dimensional entanglement. In reality, the only way to entangle them is through high-speed fluid processing at a low pressure of 20 kg/cm ² .
Furthermore, since it is an entanglement of ultrafine fibers with a cut length of 10 mm or less, as well as high strength and low elongation, it is easy to imagine that the wear resistance due to brushing will decrease as the sheet is ground to make it thinner. Dew.
According to the method of the present invention, all such drawbacks are eliminated. The partial fusion treatment of a non-separable and integrated sheet used in the present invention is a process in which only the ultrafine elastic fibers in the sheet are partially fused. The method is a high frequency dielectric heating method or a thermocompression bonding method. The dielectric loss of thermoplastic polyurethane is smaller than that of the polymer used for ultrafine inelastic fibers, and ultrafine elastic fibers can be selectively fused using high-frequency dielectric heating without fusing highly twisted knitted fabrics or ultrafine inelastic fibers. is possible. When performing high-frequency dielectric heating in the present invention, the frequency varies depending on the thickness of the sheet, the proportion of ultrafine inelastic fibers, etc.
Although not strictly limited, it is usually preferable to use a high frequency region of about 27 MHz. Further, even if high-frequency dielectric heating and external heating using hot air are used together, there is no problem as long as the control is performed so that only the ultrafine inelastic fibers are fused. The thermocompression bonding method suggests passing a sheet through hot air and crimping it with a roller inside or at the outlet, or passing it through a heated roll and crimping it. The composition ratio of ultrafine elastic fibers in the sheet of the present invention is
It is preferably 8 to 60% by weight, preferably 20 to 40% by weight of the total fiber. If it is less than 8% by weight, it will be difficult to obtain sufficient abrasion resistance, and if it exceeds 60% by weight, it will become rubber-like and it will be difficult to obtain a product with the desired softness and drape properties. The entanglement process used in the present invention suggests a needle punch method and/or a high-speed fluid treatment method. The needle density in the needle punching method varies depending on the desired sheet thickness, so it cannot be absolutely limited, but it is usually in the range of 1,000 to 6,000 needles/cm ² . However, when used together with high-speed fluid processing, the needle density may be kept below 1000 needles/cm ² . High-speed fluid treatment methods suggest methods using gas or liquid jets. Generally, a high-speed water jet treatment method is used from the viewpoint of safety, cost, or workability. The fluid injection pressure is usually preferably in the range of 20 to 200 kg/cm ² . If it is more than 20 kg/cm ² , entanglement will not be sufficient and the abrasion resistance will decrease, and if it is more than 200 kg/cm ² , although entanglement will proceed, the impact pressure will be strong, creating vertical scratches and spoiling the appearance of the product, which is not preferable. In order to further increase the product value of the sheet of the present invention, buffing, dyeing, or rolling may be performed after the partial fusion treatment. The artificial leather sheet of the present invention can be widely applied to clothing, furniture, interior items, bags, etc. It is particularly preferably used in fields where flexibility is required. [Example] The present invention will be explained in detail below with reference to Examples.
The present invention is not restricted or limited by these Examples. Rather, it brings about the next application development. The measurement of the product in the present invention is carried out by the following method. (1) Tensile strength: JIS-L1079-5. Tensile elongation: 12.1 (2) Abrasion resistance: ASTM.D−1175 (SCHIEFER ABRASION TESTING M/
(Using C) Load: 3628.8g Brush: Nylon Length 13mm Sample size: Diameter 9mm Rotate the brush under the above conditions to wear it out, and calculate the front and rear fuzz falling load (in mg) (3) Flexibility: JIS-L1079 -5.17B method (drape tester YD-100) Example 1 Sea-island type polymeric mutual arrangement fiber staple () to obtain the ultra-fine inelastic fibers shown below, sea-island type polymeric mutual arrangement to obtain the ultra-fine elastic fibers Array fiber staples () and high twist fabrics () were prepared. (1) Staple () Sea component (A): Polystyrene (manufactured by Asahi Dow, C/
#679) Island component (B): polyethylene terephthalate component ratio with intrinsic viscosity of approximately 0.71: (B)/(A) = 55/45% by weight Composite fiber denier: approximately 3.8d Island component fiber denier: approximately 0.058d Island component fiber Strength: 4.8 g/d Island component fiber elongation: 61% Fiber length: Approx. 51 mm Ken shrinkage number: Approx. 13 threads/in (2) Staple () Sea component (A'): Same type of polystyrene as staple () Island component ( B'): Thermoplastic polyurethane [manufactured by Nippon Elastolan Co., Ltd., using variety E995] Component ratio: (B')/(A') = 50/50 Composite fiber denier: Approx. 6.1d Island component fiber denier: Approx. 0.19 d Island component fiber strength: 1.28g/d Island component fiber elongation: 412% Fiber length: Approx. 51mm Ken shrinkage: Approx. 11 threads/in (3) Strong twist fabric () Fiber component: Polyethylene terephthalate woven structure: Plain denier / Filament: 50D/48f Number of twists: 2750T/m Vertical x horizontal density: 96 x 84 pieces/in Fabric weight: 51 g/m ² First, pass the staple () through the card, cross wrapper, and pre-punch M/C to a fabric weight of 148 g/m ²
I created a sheet. Then staple()
A sheet with a basis weight of 53 g/m ² was produced using a process similar to that of Staple (). Next, the highly twisted fabric () was spread out uniformly, and a sheet made of staples () was laminated thereon, and then a sheet made of staples () was laminated thereon. Using a needle board with this three-layer laminated sheet planted in a barb direction of 45°, the needle depth was 7 mm and the needle density was 3000.
Needle punch so that the area is 1/cm ² .
A three-layer sheet of 270 g/m ² was obtained. This sheet is 98
It was subjected to shrinkage and latent torque unwinding treatment with hot water at ℃ and then dried. Then in trichlorethylene,
The staples () and () were removed from polyester and dried. This is heated using hot air (100℃) and high frequency dielectric heating (output 5 kW, frequency 27M).
Hz) at a speed of 3 m/min, and nipped with rollers at the exit of the device. Contains 16.7% by weight (total fiber amount) of ultra-fine elastic fibers, and
A non-separable integrated sheet having a substantially three-layer entangled structure consisting of a strongly twisted fabric in which ultrafine elastic fibers were partially fused/ultrafine elastic fibers/extreme inelastic fibers was obtained. This sheet was subjected to side paper buffing M/C to buff the layer in which the ultra-fine inelastic fibers were mainly entangled to perform a raised treatment, resulting in a fabric weight of 170 g/m ² ,
A gray fabric with a thickness of 0.4 mm was obtained. This gray fabric was dyed blue using disperse dye, and the fabric weight was 190g/m ² and the thickness was
A dyed product of 0.05 mm was obtained. The obtained thin artificial leather sheet had an elegant suede-like appearance, was flexible and drapeable, and had excellent abrasion resistance as shown in Table 1. Comparative Example 1 Using the staples () used in Example 1, a sheet with a basis weight of 205 g/m ² was produced through the same process. Next, the same highly twisted fabric as in Example 1 was spread uniformly and a sheet made of staples () was laminated thereon, and needle punching was performed under the same conditions as in Example 1 to form two layers with a basis weight of 275 g/ ^m2. An entangled sheet was obtained. This sheet was subjected to shrinkage and unrolling treatment under the same conditions as in Example 1.
A sheet in which the highly twisted fabric and ultrafine inelastic fibers were inseparably integrated was obtained by removing polystyrene. Next, this sheet was impregnated with DMF polyurethane so that the solid content was 18% by weight based on the total amount of fibers.
Wet coagulated. This sheet was subjected to DMF removal treatment in hot water and dried. The obtained sheet was used in Example 1.
After the same raising process as above, the fabric weight was 178g/m ² and the thickness was
I got a greige of 0.42. This gray fabric was dyed under the same conditions as in Example 1 to obtain a dyed product with a weight of 202 g/m ² and a thickness of 0.52 mm. As shown in Table 1, the obtained thin artificial leather sheet has an appearance similar to that of Example 1, but has slightly poor flexibility and abrasion resistance, giving an odd feeling of polyurethane adhering to the surface of the highly twisted fabric. This was a decrease in

[Table] Constituent ratio of fibers [Effects of the invention] The effects of the invention are listed below. (1) Excellent wear resistance despite being thin. (2) Although it is flexible, it has moderate packability and is resistant to wrinkles. (3) Balanced elasticity and elongation. (4) The anchor effect and binder effect of the napped fibers can be obtained by partially fusing the ultra-fine elastic fibers. (5) Since a strongly twisted knitted fabric is used, the knitted fabric is not damaged by the needles when entangled.

Claims (1)

[Claims] 1. Highly twisted knitted fabric, ultrafine elastic fibers of 1.0 denier or less, and 0.8 denier or less, and whose main length is
It is a composite sheet composed of ultrafine inelastic fibers of 20 mm or more, and the ultrafine elastic fiber entangled sheet is mainly interposed between the strongly twisted knitted fabric and the ultrafine inelastic fiber entangled sheet, and these are inseparable. A flexible thin artificial leather sheet with excellent abrasion resistance, characterized by having a structure in which ultrafine elastic fibers are tightly intertwined as if they were a single body and partially adhered to each other. 2 The number of twists of the highly twisted yarns constituting the highly twisted knitted fabric is
A flexible thin artificial leather sheet with excellent abrasion resistance according to claim 1, which has an abrasion resistance of 500T/m to 4000T/m. 3. A flexible thin artificial leather sheet with excellent abrasion resistance according to claim 1 or 2, wherein the highly twisted knitted fabric is composed of strongly twisted yarns in both warp and weft yarns. 4. The thin artificial leather sheet according to claim 1, wherein the ultrafine elastic fibers are thermoplastic polyurethanes and are present in an amount of 8 to 60% by weight based on the total fibers. 5 Layering an ultrafine elastic fiber sheet of 1.0 denier or less on a highly twisted knitted fabric, further laminating an ultrafine inelastic fiber sheet of 0.8 denier or less and having a main length of 20 mm or more on top of that, and performing an entanglement treatment, After that,
Production of a flexible thin artificial leather sheet with excellent abrasion resistance, characterized by subjecting the highly twisted knitted fabric to latent torque unwinding treatment as required, and then subjecting ultrafine elastic fibers to partial fusing treatment. Method. 6. The method for producing a flexible thin artificial leather sheet with excellent abrasion resistance according to claim 5, wherein the partial fusion treatment is high-frequency dielectric heating or thermocompression bonding treatment.