WO2000060159A1

WO2000060159A1 - Leather-like sheet and method for preparing the same

Info

Publication number: WO2000060159A1
Application number: PCT/JP2000/001744
Authority: WO
Inventors: Sumito Kiyooka; Tomohiro Hayakawa; Tamemaru Esaki
Original assignee: Kuraray Co., Ltd.
Priority date: 1999-03-31
Filing date: 2000-03-22
Publication date: 2000-10-12

Abstract

A leather-like sheet comprising a fiber structure which is formed by entangling in one piece a nonwoven fabric comprising superfine fibers having a fineness of 0.3 denier or less and a reinforcing cloth and also contains an elastomeric polymer together with the resulting entangled material, wherein a stress of the structure up to the first peak in the longitudinal direction is 15 % or more and a stress thereof up to the first peak in the transverse direction is 20 % or more, and also a tear length in the longitudinal direction - strain curve and a tear length in the transverse direction - strain curve are each in a specific range, the sheet having a density of 0.4 g/cm3 or more. The sheet has a high resistance to deformation in a low strain region and, due to its high fiber density, provides a sense of fulfillment extremely similar to that of natural leather.

Description

Description Leather-like sheet and its manufacturing method

The present invention relates to a fibrous structure in which a reinforcing fabric is firmly integrated with an ultrafine fiber aggregate, in which an elastic resin is impregnated. More specifically, an ultrafine nonwoven fabric having a high fiber density has a low strain range. The present invention relates to a leather-like sheet provided with high anti-deformation property, a method for producing the same, and a reinforcing cloth used therefor. Background art

Conventionally, artificial leather reinforced with a woven or knitted material is known. For example, Japanese Patent Publication No. 4-111113 discloses a knitted fabric made of a strongly twisted yarn having a twist number of 100 T / m or more. This technique is intended to minimize damage to the reinforcing fabric due to the needle punch when the staple web and the reinforcing fabric are integrated using a needle punch. And a method for producing a soft leather-like sheet. Also, Japanese Patent Application Laid-Open No. H10-2738885 discloses a high strength and particularly stretchy using a knitted woven fabric composed of a strongly twisted yarn as a reinforcing material, as in Japanese Patent Publication No. 4-11113. There has been proposed a fiber nap sheet having properties. In both of these technologies, the staple web and the reinforcing fabric are laminated and integrated by needle punch, a slight shrinkage is applied to the obtained composite sheet, and then PVA (polyvinyl alcohol) is impregnated and adhered to the composite sheet. Is extracted and removed, and then an elastic resin is impregnated to produce a leather-like sheet. In addition, Japanese Patent Application Laid-Open No. 55-57059 discloses a filler having latent shrinkage. This paper describes a reinforcing fabric consisting of a reinforced material, in which a papermaking web made of short fibers having a fiber length of 10 mm or less and a laminate of the reinforcing fabric are entangled and integrated by a high-pressure water flow, and then the reinforcing fabric shrinks. It describes a method for improving the apparent fiber density of a sheet.

Further, as another reinforcing cloth, there is a cloth known as a so-called backing material in which after the entanglement of the fiber web alone is completed, the reinforcing cloth is attached to the back.

However, each of them has the following advantages and disadvantages. In other words, in the case of the technique described in Japanese Patent Publication No. Hei 4-4-1113 and Japanese Patent Laid-Open No. Hei 10-2738885, the reinforcing fabric is integrated with the ultrafine fiber web, The purpose is to produce a structure with cutting strength and flexibility, and the strength value when cutting a sheet is relatively high, and it is certainly due to the effect of the reinforcing material compared to the state of only the fibrous web. Although the deformability of the sheet is low, the deformability is still very high when the distortion is in the range of about 10%. In other words, in the case of the above-described technique, damage to the reinforcing fabric caused by needle punching is certainly suppressed, and although the sheet after intertwining is strengthened, the strength after intertwining is achieved. It is not preferable in terms of the apparent density of the fiber web. In other words, in general, even if a technique of heat shrinking the entangled web for the purpose of improving the apparent density is used, in the technique of this publication, the fiber web has almost no shrinkage, Only a slight morphological change equivalent to the torque release of the high-twisted filament yarn, which is a constituent yarn, can be obtained. Actually, even if one of the web and the fabric is heat-treated and contracted in order to increase the apparent density of the laminate of each one of the web and the fabric, the heat treatment will cause the laminated sheet to have curls, wrinkles, and surface irregularities. Will occur, causing troubles in later processes and degrading the product quality. In addition, when the web Z fabric / web three layer lamination ' However, the degree becomes very small, and the apparent density hardly improves. Although the above publication describes that PVA is adhered, when PVA is applied, the fiber space is filled with PVA, and the space between fibers in such a sheet becomes large. Therefore, the apparent density of the finished sheet is low, and the sheet structure is easily deformed even under tensile strain.

Further, the technology disclosed in Japanese Patent Application Laid-Open No. 55-57959 discloses a fabric obtained by hydroentanglement of a reinforcing fabric made of latently shrinkable filaments and a papermaking machine made of fibers having a fiber length of 10 mm or less. However, because of the papermaking web, the entanglement between the constituent fibers is small and the entanglement with the reinforcing fabric is also low. Also, since the adhesion of the elastic resin is very small, when the sheet is distorted, the web hardly contributes to the anti-deformation property, and the degree of deformability naturally achieved must be low. There is a fate. In addition, when looking at one of the product performances, there is a drawback that the fibers are easily dropped from the sheet due to the above-mentioned manufacturing method.

Further, in the case of a method of backing a reinforcing cloth after the entanglement of the fiber and the web alone is completed, the deformation resistance of the sheet can be controlled by selecting a backing material. Since shrinkage treatment can be performed only in a state, a high apparent density can be manufactured by using a shrinkable web.However, the bonding between the fiber web and the reinforcing fabric is weak, and peeling occurs during processing. Therefore, there is a drawback that a manufacturing process is required and the manufacturing cost is increased.

In order to more effectively produce a high anti-deformability sheet, the bonding of the fiber 補強ブ and the reinforcing fabric is performed by laminating the reinforcing 時に fabric when the fiber ゥ自身 itself has a low degree of entanglement, and mechanically joining the two by water flow or needle punching. It is desirable that the entanglement is very strong. In this way, by laminating and intensifying the strong fabric, In particular, sufficient selection of reinforcing fabrics not only gives the finished product sheet anti-deformation properties in the low strain region, but also changes the morphology of the fiber sheet during many manufacturing processes (especially elongation due to process tension). Is suppressed. As a result, the fiber-to-fiber distance is maintained at a relatively short state, and a structure is easily suppressed in shape change during subsequent impregnation of the elastic resin. In particular, in the case of a suede-like leather-like sheet, the surface fiber density is a very important factor that determines the product quality. Important points to increase the apparent density of the composite sheet are: ① It is important to increase the apparent density by shrinking the fibrous web, and ② It is important to prevent the sheet from elongating due to tension during the manufacturing process. . However, as described above, conventional techniques cannot suppress deformation in a low distortion region and have a high apparent density. Disclosure of the invention

The present invention is a leather-like sheet in which an ultrafine fiber web and a reinforcing fabric are integrated, suppressing the occurrence of elongation and curling during the manufacturing process, and increasing the apparent density of the leather-like sheet by shrinkage treatment. It provides a leather-like sheet that achieves high resistance to deformation in the final sheet, has high commercial value, and is less expensive to manufacture than conventional bonded products.

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention relates to a fiber in which a nonwoven fabric made of an ultrafine fiber of 0.3 denier (abbreviated as dr) or less and a reinforcing fabric are entangled and integrated, and the entangled integrated product contains an elastic polymer. A structure having a strain of at least 15% up to the first peak in the evening direction of the structure, and a breaking length-strain curve up to the first peak being a straight line passing through the following OA. It is in the range between the straight lines passing through the OC, the strain up to the first peak in the horizontal direction is 20% or more, and the breaking length-strain curve up to the first peak is as follows: And a straight line passing through 範囲 C ′, and having a sheet density of 0.4 g / cm ³ or more. Evening (strain (%), breaking length (km)) = 0 (0, 0), A (30, 2.0), C (5, 3.5)

Horizontal (strain (%), breaking length (km)) = 〇 (0, 0), A '(40, 1.5), C' (20, 2.5)

Here, the "break length" is calculated by the following equation.

Breaking length (km) Double sheet strength (gZc m) Z sheet weight (gZm ² ) / 10

The present invention also relates to a preferred method for producing the leather-like sheet, specifically, a yarn composed of a fiber having a shrinkage of 10 to 30% in hot water of 90 C, At least one side of a reinforced fabric with a fiber strength of 6 kgZcm or more at 20% elongation and a horizontal strength of 4 kgZcm or more, an ultrafine fiber with a fiber length of 3 to 150 mm or ultrafine The fibers are made of a possible fiber, and the shrinkage in hot water at 90 ° C after entanglement is in the range of 10% to 30% for both fibers, so that the fabric and the fibers are combined. After heat-shrinking the entangled and integrated fiber sheet, a hydrophilic polymer is applied. This is a method for producing a characteristic leather-like sheet.

Further, the present invention provides a reinforcing fabric constituting a fiber sheet used in the above method, comprising a yarn composed of a fiber having a shrinkage of 10 to 30% in hot water at 90, An artificial leather reinforced fabric characterized in that the strength at 20% elongation is 6 kgZcm or more and the horizontal strength is 4 kgZcm or more. Brief description of drawings Figure 1 shows the breaking length-strain curve in the horizontal direction, and Figure 2 shows the breaking length-strain curve in the horizontal direction. The first peak referred to in the present invention is the tear length-strain curve of the sheet, when the strain is applied from 0, the tear length increases as the strain increases, and the tear length reaches the peak. After this, a falling phenomenon is usually seen, which means this peak. In addition, when a peak does not substantially exist until the cleavage, the cleavage point means the peak referred to in the present invention. Further, the leather-like sheet / reinforced fabric is manufactured as a long sheet which is continuous in the length direction. In the present invention, the evening direction is defined as the length direction of the sheet / reinforced fabric, that is, in general, the mechanical direction. The term “direction” refers to a direction, and the term “horizontal direction” refers to a direction (width direction) perpendicular to the evening direction. BEST MODE FOR CARRYING OUT THE INVENTION

In the leather-like sheet having high morphological stability of the present invention, it is important that deformation is difficult in a low strain region, which is caused by a sheet crack corresponding to a stress-strain curve during deformation. The shape of the length-strain curve is important. In other words, the curve from the beginning of the fracture length-strain curve to the location where the first peak is present is shown in the direction of the evening and the direction of the horizontal, respectively.

Evening (strain (%), breaking length (km)) = 〇 (0, 0), A (30, 2.0), C (5, 3.5)

Horizontal (strain (%). Break length (km)) = Ο (0, 0), A '(40, 1.5), C' (20, 2.5)

The sunset is within the area between the straight line passing through 0 and A and the straight line passing through 〇 and C, and the strain elongation to the first peak is 15% or more, more preferably the curve Is in the range between the straight line passing through 〇 (0, 0) and A− 2 (3 0, 3.0) and the straight line passing through 〇 C. Also, the '' co exists in the area between the straight line passing through O and A 'and the straight line passing through 0 and C'. J

7 and the strain elongation up to the first peak is 20% or more, and more preferably, the area where the curve exists is 0 (0, 0) and A'12 (40, 2.0). It is within the range between the straight line passing through and the straight line passing through 〇C '. As described above, Fig. 1 shows the breaking length-strain curve in the horizontal direction, and Fig. 2 shows the breaking length-strain curve in the horizontal direction.

If this curve is shifted to the higher fracture length side with lower elongation in either one of the two sides (region I in Fig. 1 and Fig. 2), the sheet High strength is very good, but the elongation is too low, resulting in a sheet with poor deformability. Such sheets are poor in some physical properties such as tear strength, and the sheets are too hard to be subjected to secondary processing and have poor moldability, and are very inconvenient when used in various applications. It becomes a sheet. On the other hand, if the curve is on the low elongation side with high elongation (region III, ΠΓ in Figs. 1 and 2), the sheet is excellent in terms of flexibility and secondary processing is also required. Although it is easy to deform, it is not a good sheet because it is too deformable and stretches too much during secondary processing, or changes its form during use after commercialization. That is, it is important that the above-mentioned curve exists within the range (Π, Π ′) shown in the present invention. In the case where conventional shrinkage is not performed, when the degree of shrinkage is small, or when only one of the fibrous web and the fabric is shrunk, each of them usually falls in the region of HI and ΠΓ. Also, when only one of the vertical direction and the horizontal direction is contracted, the direction not contracted usually falls within the region m or nr.

Next, in adjusting the curve so as to be within the above range (Π, Π ′), another important point is that the apparent density of the leather-like sheet of the present invention, which is a composite sheet, is within a specific range. It is to be. The composite sheet of the present invention is basically composed of ultrafine fibers as main fibers, reinforced fabric, and It is a composite made of elastic resin to be made. In order for the sheet of the present invention to exhibit the above-described effects, the sheet density needs to be 0.4 g / cm ³ or more, and more preferably 0.43 to 0.5 lg / cm ^3. It is. If the density is less than 0.4 g / cm ³ , the entanglement between the fibers is insufficient, the distance between the fibers during entanglement is slightly large, and the bonding state with the elastic resin is also insufficient. Therefore, it is not enough to obtain high deformation resistance of the sheet, and a sheet having such a density has a low breaking length and a large elongation. That is, it is very important and indispensable that the density of the sheet be 0.4 gZ cm ³ or more specified in the present invention in order to achieve the object of the invention. The apparent density of the natural leather still is usually 0. 5 gZcm ³ back and forth from the top to obtain the fulfillment of a natural leather-like also to the apparent density of the leather-like sheet of the present invention and 0. 4 gZcm ³ or more is important. Most of the conventionally known suede-like artificial leathers have an apparent density of less than 0.4 g / cm ³ , and hardly satisfy the 0.4 g / cm ³ or more specified in the present invention.

Next, a method for producing a sheet having a suitable elongation and a high breaking length as described above will be described in detail.

First, the fibers constituting the reinforcing fabric in the present invention must have a shrinkage of 10 to 30% in hot water of 90 ⁼ C at the time of forming the fabric. The fiber is not particularly limited as long as it has such a hot water shrinkage rate.The polymer constituting the fiber may or may not be modified, but the above-mentioned shrinkage rate is not increased in hot water at 90 ° C. It is preferable to use polyester fibers, for example, those having an amorphous substituent such as isofluoric acid introduced therein, or perhydrodimethanonaphthalenediethanol (MNDM), since these can be easily obtained. , Norbornane-1,2,3-dimethanol (NDM), tricyclodecanedimethanol (TC DDM), etc., which have introduced alicyclic skeleton-based substituents, and the solution viscosity of polyester even without modification By adjusting the conditions of spinning, drawing, and heat treatment to control the crystallinity of the fiber, a shrinkage ratio in the above range is used. Polyester fibers are the most preferable in that fibers having the most desired shrinkage can be easily obtained among many fibers, and the shrinkage is stable. Alamid fiber and natural fiber do not satisfy both fiber strength and shrinkage in hot water in a well-balanced manner, and are not preferred.

In the present invention, the shrinkage ratio of the fibers constituting the reinforcing cloth is 10 to 30% in hot water at 90 ° C., and preferably 15 to 30%. If the shrinkage ratio is less than 10%, the shrinkage ratio of the woven or knitted fabric is insufficient. If it exceeds 30%, the fabric hardens due to the thickening of the fibers due to shrinkage, or the physical properties of the fabric are reduced due to embrittlement of the constituent resin, and the fabric is not used as a reinforcing fabric.

The shrinkage of the reinforcing fabric is preferably approximately the same as the shrinkage of the ultra-fine fibers or ultra-fine fibers to be combined. ツ If the shrinkage is significantly different, curl and wrinkles during shrinkage In some cases, sheet surface irregularities may occur. According to the research results of the present inventors, the shrinkage ratio (90.C in hot water) of ultrafine fibers or ultrafine fibers that provide excellent product surface quality and tactile sensation is 10 times for both Yoko and Yoko. The fiber density is insufficient when it is less than 10%, and the sheet becomes hard when it exceeds 30%. Therefore, in the present invention in which the reinforcing fabric is laminated, in order to realize the above-mentioned shrinkage ratio range of the web without any trouble, in the present invention, the 90 ° C. hot water shrinkage ratio of the fibers constituting the reinforcing fabric is 10 to 30 ° C. %. As is evident from this, it is preferable that the difference in shrinkage ratio between the reinforcing fabric and the entangled fiber web in hot water at 90 ° C is lower, and when the fiber length of the web is 20 mm or more, It is preferable that the difference in shrinkage ratio is in the range of 0 to 10% in the evening direction and the difference in shrinkage ratio in the horizontal direction is 0 to 6%. If the fiber length is less than 20 mm, It is preferable to suppress the difference in shrinkage within a range of 0 to 20% in the direction and 0 to 15% in the horizontal direction. Note that the difference between the vertical direction and the horizontal direction is a difference due to the process tension, and in the vertical direction, even if the difference in the shrinkage ratio is slightly high, it is difficult for curl or the like to occur. Regarding the difference in shrinkage due to the fiber length, if it is less than 20 mm, the entanglement between the fibers is weak, and even if there is a relatively large difference in shrinkage, the above-mentioned problem is relatively unlikely to occur.

As described above, the polymers used for the fibers constituting the reinforcing fabric include, for example, low heat shrinkage control, good color development during dyeing, good color fastness, and general and low cost. From the viewpoint, a polyester such as polyethylene terephthalate fiber or modified polyester fiber is preferable. As described later in particular, the reinforcing fabric of the present invention preferably controls delicate shrinkage in accordance with the shrinkage of the fibers to be combined, and polyester fibers are particularly preferable in this regard. Of course, other than polyester, for example, nylon-based fiber, vinylon-based fiber, polyolefin-based fiber, and acrylic-based fiber can also be used.

The thickness of the fibers constituting the reinforcing fabric is preferably 0.1 to 2.5 dr (0.11 to 2.8 dtex) in terms of single fiber fineness. When the thickness of the single fiber is in this range, even after heat shrinking after forming the fabric, the fineness is not too large and the sheet does not become too hard.

In the present invention, as the yarn constituting the reinforcing fabric, any yarn such as a multifilament yarn or a spun yarn can be used as long as the yarn satisfies the above-described shrinkage ratio. It is preferable to make it consist of. The yarn is twisted for bundling, but the preferred range of the number of twists of the yarn is in the range of 550 to 200 TZm before the shrinkage treatment, and more preferably The range is from 65 to 900 TZ m. In the present invention, the shrinkage of the fiber used is taken into consideration, and after the shrinkage treatment, the number of twists falls within the following range. It is preferable to set the number of twists of the yarn before shrinking so as to fit.

Specifically, the number of twists of the yarn constituting the reinforcing fabric after the shrinkage treatment is preferably at least 65 T / m, and no more than 2800 T / m, and more preferably at most 800 T / m. It is in the range of up to 1200 T / m. When the number of twists of the yarn after the shrinkage treatment exceeds 280 TZm, the fibers constituting the yarn are easily embrittled by shrinkage, the apparent density of the shrinkable sheet, the anti-deformation property in a low strain region, Although the tensile strength and the like are improved, the cured sheet has a low tear strength, which is not preferable. This tendency is particularly remarkable in the case of spun yarn. If the number of twists of the yarn after the shrinkage treatment is less than 6δ0 T / m, the effect of the anti-deformation property of the sheet expected as a reinforcing fabric is not sufficiently exhibited, which is not preferable. In particular, after the shrinkage treatment, when the number of twists of the yarn is 800 to 1200 TZm, an excellent leather-like sheet with a good balance between the texture and the deformability in the low distortion range can be obtained. Can be

The entanglement of the reinforcing fabric and the web made of ultrafine fibers or ultrafine fibers can be performed by any method that can be effectively entangled, such as a hydroentanglement process or a needle punching process. This is a method using needle punching, which is a method for obtaining high entanglement. At this time, the reinforcing fabric is damaged by the needle punching process, but the number of twists is 550 T / m to 200 TZm, especially 65 to 9 By being 0 0 T Zm, the yarn damage is small, sufficient entanglement with the fiber web can be achieved, a higher apparent density can be obtained, and a morphological change in a low strain region can be prevented. Preferably, it is suitable for producing the fiber sheet of the present invention. More specifically, the yarn in the reinforcing fabric is subjected to a certain degree of damage by the needle punching process performed when the web and the fabric are intertwined with each other. Particularly in the case of a spun yarn having a low twist number, damage can be greatly reduced. What In other words, since the spun yarn is composed of discontinuous fibers, even if the constituent fibers are damaged or slipped by the needle punch, the effect on the total yarn strength drop is small, and the present inventors' research has According to this, this effect is remarkably obtained when the number of twists is 200 OT Zm or less, preferably 900 T Zm or less before the shrinkage treatment. In other words, if the number of twists exceeds 200 TZm before the shrinkage treatment, the binding force of the fibers in the yarn increases, and the degree of freedom is lost, so that the fibers are less likely to escape when caught on the needle pub. This is presumed to be due to the fact that the needle fibers are more likely to be caught in the needle pub due to the fact that they are easily damaged and the spacing between the single fibers is narrower. Although the strength of the reinforcing fabric itself immediately after needle punching temporarily decreases slightly due to minute damage to the fibers, the desired sheet physical properties can be realized by increasing the fiber thickness by the subsequent shrinkage treatment. Therefore, in consideration of the influence of the number of twists after the above-described shrinkage treatment, the reinforcing fabric of the present invention is preferably a yarn having a high shrinkage of not more than 200 TZm before the shrinkage treatment. Preferably, it is made of spun yarn. However, if the number of twists is less than 550 TZm, the morphological change in the low strain region tends to be large, and the apparent density does not sufficiently improve even after the shrinkage treatment. From the above, the most preferable is a highly shrinkable spun yarn having a twist number in the range of 600 T / m to 900 TZm.

In addition, when the water entanglement method is used for the entanglement method, if the number of twists of the yarn is too high, the yarn becomes too tight and the looseness between the single fibers disappears, thereby reducing the entanglement between the fiber and the fabric, and particularly the papermaking web. At the time of lamination with, the fiber detachment increases. However, if the number of twists is less than 200 OTZ m before the shrinkage treatment, especially in the case of spun yarn, the entanglement of the web with the fluff peculiar to the spun yarn works effectively. There is also a moderately loose part between them, and this part is entangled, and the phenomenon that the entanglement of the web fiber and the reinforcing fabric becomes effective is observed. As a result, the reinforcing fabric is converted from the multifilament yarn. Easy to occur when the fabric is The detachment of the web fibers can be eliminated. In the case of spun yarn, the degree of heat shrinkage of the yarn can be adjusted by mixing fibers having different shrinkages, and in this sense, the use of spun yarn is useful.

Regarding the thickness of the yarn constituting the reinforcing fabric used in the present invention, the yarn count of 30 to 45 is the number of cotton, the yarn strength, the handleability as a fabric, the needle punch, and the diameter at the time of water entanglement. It is preferable in terms of entanglement and yarn damage. When the reinforcing fabric used in the present invention is composed of spun yarn, the fiber length of the fiber constituting the spun yarn is preferably 30 to 100 mm, and the fiber length is less than 30 mm. In such a case, the strength of the yarn is low and the strength required as a reinforcing fabric is reduced. When the fiber length exceeds 100 mm, there is a defect similar to the case where a filament yarn is used.

Next, a method of forming the reinforcing cloth into a fabric will be described. Generally known knitted fabrics such as a sheet knitted fabric and a tricot knitted fabric and a plain woven fabric are preferred. In particular, a woven fabric is desirable because the shrinkage of the yarn is directly reflected on the reinforcing cloth and the processability in the subsequent steps.

The structure of the woven fabric may be any structure as long as it can be later subjected to needle punching or water entanglement, but it is easy to obtain strength, easy to balance, tensile strength in the vertical direction, shrinkage of yarn Plain weave is preferred because the properties appear more directly and are easier to adjust. In the case of woven fabrics, the warp yarn and the weft yarn may be of the same type or different types, as long as they conform to the content of the present invention, but the shrinkage of the yarn is low. It is preferable that the shrinkage of the knitting yarn is in the range of 0.3 to 0.95 times. Because of the process tension during the manufacturing process, the warp direction is less likely to shrink. For this reason, if the shrinkage rate in the fabric direction must be reduced to some extent compared to the weft direction when designing the fabric, distortion during the shrinkage treatment will remain in the fiber, and the strain will relax under more severe thermal conditions such as dyeing. Shrinks vertically and is perpendicular to the sheet length (width Wrinkles will be formed. Therefore, it is preferable to set the shrinkage ratio of the evening yarn and the weft yarn within the above-mentioned range.

Regarding the weaving density, any material can be used as long as it is satisfactory as a reinforcing cloth, but the length is preferably 40 to 100 yarns / inch, and the horizontal is 30 to 90 yarns, and more preferably Z-inch. The range is 50-80 inches per inch, and 40-70 inches per inch. In this preferred range, the anti-deformation property of the final sheet and the anti-deformation property in the manufacturing process are considered. It is also excellent in handleability. It is preferable to set the yarn density higher than the weft yarn density in order to prevent the sheet from being deformed by process tension. According to the research results of the inventors of the present invention, when the length is increased, even if the width is slightly shrunk, the overall area is expanded, and the apparent density of the fibers in the sheet is reduced. As a result, when it becomes a product, it becomes a sheet with large fiber spacing and large deformability, and the surface quality deteriorates. Therefore, it is preferable to adjust the weaving density of the reinforcing cloth as described above.

Examples of the loom used for weaving the reinforcing cloth include known looms such as a Chiltour loom, a fly loom, a war trowel loom, a rapier loom, and an air jet loom.

The strength value of the reinforcing fabric used in the present invention at 20% elongation is as follows: vertical strength is 6 kgZcm or more, horizontal strength is 4 kgZcm or more, and preferably 10 to 20 kN. gZcm, horizontal strength is 5 ~ 15 kg / cm. In the case of a composite sheet with a web, the physical properties of a reinforcing sheet, the entanglement of a fibrous web, the state of adhesion and presence of an elastic resin, and the like are interrelated to determine the physical properties of a leather-like sheet. One of the important points of the study is that in order to produce a leather-like sheet having high resistance to deformation in the low strain range, the strength value of the reinforcing fabric alone is within the above range. It is. In addition, the deformation resistance of the reinforced fabric depends on the morphological change during the manufacturing process and the leather-like sheet of the final product. Related to low deformability. When the leather-like sheet is used as a surface material such as chairs and sofas, abrasives, industrial materials, etc., it is required that the strength at the time of low distortion is high. A fabric with a sufficient strength value must be used.

The reinforcing fabric thus produced is laminated with a fiber web having high shrinkage and entangled without being heat-set in order to maintain heat shrinkability later.

The other web made of entangled ultrafine fibers or ultrafine fibers can be made by laminating a plurality of thin webs opened by a card to a specified weight with a cross wrapper, or by using a random webber. Make it. In order to more tightly entangle with the reinforcing cloth, it is preferable that both are laminated and entangled in a state of a low degree of entanglement. Specifically, the two - when using entangling treatment by the Dorupanchi, about 3 0 0 punches Z cm ² or less, also in the case of using a hydroentanglement is 1 0 0 by stacking the non entangled state web The treatment is preferably performed at a high water pressure of kgf / cm ² or more.

As described above, the shrinkage rate of the fiber web must be in the range of 10 to 30% in both the horizontal direction and the horizontal direction. The shrinkability of the fiber web is related to the sheet structure and the number of surface fluffs that give the product deformation resistance, and is an important value that determines both the high resistance to deformation and the product quality aimed at by the present invention. In particular, for applications such as abrasives, the fact that the product surface is sufficiently dense with ultrafine fibers greatly affects polishing accuracy and the like. If the shrinkage is less than 10%, the fiber density is coarse and the product is low quality in terms of surface nap. If it exceeds 30%, the sheet becomes too hard. The shrinkage of the fibrous web in the present invention, the entangling treatment at the time of entangling integrate the fabric and the fibrous web for reinforcement performed on fibers Uetsu blanking alone obtained entangled nonwoven fabric of 9 0 ^e C After immersion in hot water for 5 minutes in a free state, measure the length of the fiber web in the horizontal and horizontal directions It means the ratio that each length becomes smaller before and after immersion. The fibers constituting the fiber web have a fiber length of 3 to 150 mm, preferably within a range of 20 to 150 mm. If the fiber length is less than 3 mm, an effective fiber entangled state cannot be obtained by the hydroentanglement or the needle punch method, resulting in poor surface wear when the product is obtained. On the other hand, if it exceeds 150 mm, it becomes easy to become a nep when playing a card, and it is difficult to obtain a clean diamond.

As the fiber constituting the fiber tube, any fiber can be used as long as it satisfies these conditions, or any fiber that can be made ultrafine, and is preferably a fiber that can be made ultrafine. These fibers may be any of fibers composed of a single polymer, composite fibers composed of a plurality of polymers, and mixed spun fibers. The ultra-fine-thinning fiber is a polymer fiber or a mixed spun fiber comprising at least one polymer extracted and removed or decomposed and removed, or the polymer is exfoliated at the interface between the fiber constituent polymers. This is a general term for fibers that can be used to obtain ultrafine fibers. In the present invention, the ultrafine fibers or the ultrafine fibers obtained by ultrafine-refining the ultrafine fibers are preferably 0.3 dr (0.33 decitex) or less, and when the ultrafine fibers are thicker than 0.3 dr, Since the fibers are too thick, they can only be obtained with a low fiber density and a poor sense of fulfillment. Especially when the surface is finished in a fluffy shape, a high-quality suede-like product cannot be obtained. Preferably, two or more polymers are mixed-spun or composite-spun to produce a fiber having a sea-island cross section, and the sea-component polymer is extracted or decomposed and removed from the fiber to leave only the island-component polymer. As a result, this is a method for obtaining ultrafine fibers. An ultrafine fiber obtained by dividing the polymer interface of a fiber composed of a multi-component polymer by a method such as water flow, or by heat-treating and exfoliating the interface due to differences in shrinkage strain of the polymer, swelling in a specific solution, and solubility differences. Fiber may be used. Ultra-fine fibers or ultra-fine fibers The more preferable fineness of the ultrafine fibers after the formation is 0.1 to 0.001 dr (0.11 to 0.00001 decitex).

Examples of the polymer constituting the ultrafine fiber include polyesters represented by polyethylene terephthalate or a copolymer having ethylene terephthalate as a main repeating unit, 6-nylon, 66-nylon, 6-nylon, and the like. Polyesters are preferred in order to achieve a high anti-deformation property on a leather-like sheet after force production, such as polyamides represented by 10-nylon and the like. When the sea-island cross-section fiber is used as the micronizable fiber, the sea component-forming polymer includes polyethylene, polystyrene, and the like. As the island component-forming polymer, the above-mentioned ultrafine fiber-constituting polymer is, of course, a preferred example. The method for imparting latent shrinkage to the ultrafine fibers or ultrafine fibers is the same as in the case of the above-described reinforcing cloth. As the thickness of the ultrafine-thinning fiber before the ultrafineness treatment, l to 5 dr (1.11 to 5.55 decitex) is preferable in terms of entanglement of the fiber as a web. The basis weight of the fiber web is preferably from 200 to 550 gZm ² after the ultrafine treatment in terms of the basis weight of only the ultrafine fibers in the sheet after dyeing.

The entanglement treatment of the reinforcing cloth and the fiber web may be performed by a high-pressure water jet method, a needle punch method, or a combination of both. Twenty-one Dorupanchi in the case of using the method, it respectively 4 0 0-1 8 0 0 punch Zc m ² from one side to punch 8 0 0-3 6 0 0 punches Z cm number of punches ² together sided Is preferred.

The entangled laminate of the reinforcing fabric and the fiber web is subjected to a heat shrink treatment to improve the apparent fiber density of the sheet and the sheet strength. At this time, the apparent fiber density of the fiber web in the highly entangled state is further improved. The reason for this is that the distance between the fibers is shortened, and the synergistic effect with the elastic resin impregnated later. The result is ultimately important in achieving high sheet deformation resistance. At this time, in order to achieve excellent performance as described above, the shrinkage of the laminated sheet is preferably 10 to 30% in both the machine direction and the transverse direction. If the shrinkage is less than 10%, the effect of improving the apparent density of the fiber and the sheet strength is not seen, and if it exceeds 30%, the sheet is excessively shrunk and the entire sheet hardens. Not good.

Further, in order to obtain processability during heat treatment of the laminated sheet and good sheet quality, it is preferable that the thermal shrinkage ratio of the web and the reinforcing cloth be substantially the same as described above. The shrinkage in hot water at ° C is also preferably in the range of 10 to 30% in both the horizontal direction and the horizontal direction, as in the case of the fiber ゥ. If the shrinkage differs greatly between the two, the sheet will curl with the layer with the highest shrinkage inside during the heat shrink treatment, making post-processing difficult in such a state. In the present invention, as the shrinkage treatment method, a laminated integrated product of the reinforcing cloth and the fiber web is immersed in hot water at 80 to 100 ° C. In the direction of 10 to 30% in both directions, and by leaving it in warm air at 100 to 180, it can be used as a laminated product in the direction of 10 to 30 in both the horizontal and horizontal directions. There is a method of causing the contraction of%. The former method is preferred because uniform shrinkage can be obtained.

The heat shrinkage improves the apparent fiber density in the fiber sheet and the strength of the fiber sheet, enables processing that maximizes the shrinkage properties of the shrinkable fiber web, and makes the product quality surprisingly good. The sheet, which has achieved high deformation resistance mainly by the reinforcing fabric and high fiber density by the shrinkage treatment, is then used to obtain a desired leather-like sheet. When the elastic polymer is wet- or heat-sensitive coagulated, and the fibers are made of ultrafine fibers, the fibers are extracted with an extractant. And ultrafine fibers by treating with a decomposing agent. When exfoliation-type ultrafine fibers are used, applying high-pressure water flow treatment, shrinkage distortion treatment, etc. before applying the elastic polymer and dividing the fibers by a mechanical method is advantageous in terms of division. Surface and the texture of the leather-like sheet.

The elastic polymer used in the present invention may be any polymer having rubber-like elasticity, such as polyurethane, SBR, NBR, polyamino acid, and acrylic resin. Polyurethane is most preferred in terms of physical properties. The elastic polymer is preferably used in the form of a solution and is preferably subjected to wet coagulation. However, although the texture is slightly inferior, depending on the application, a polyurethane-based acryl-based polymer alone or an aqueous emulsion obtained by mixing these may be used. The amount of the rubbery elastic polymer to be applied is preferably 10 to 25% of the weight of the constituent fibers of the leather-like sheet.

Furthermore, suede-like artificial leather can be obtained by buffing the surface of the obtained sheet on the fiber-to-etch side with sandpaper or the like. Also, instead of shaving the surface, a resin is applied to the surface and embossed or flattened to obtain a natural leather-like surface unevenness, whereby an artificial leather with a silver surface can be obtained.

The obtained artificial leather can be further subjected to a dyeing process and other finishing processes as necessary.

The required deformability behavior of the final leather-like sheet in the low-strain region is determined by using a reinforcing fabric as described above, and tangling the web made of ultrafine fibers or ultrafine fibers and the reinforcing fabric together. The resulting laminate can be obtained by shrinking the resulting laminate to increase the apparent density of the fibers in the structure, and applying an elastic resin.

Next, the present invention will be described in detail with reference to examples, but the content of the present invention is not limited to the following examples. In the present invention, the shrinkage of the fiber in hot water at 90 ° C is the length measured when a load of 1/500 g / dr is applied to the fiber, and 90 ° C in the free state. It is obtained from the difference from the length measured under a load of 1/500 g / dr again after immersion in warm water for 5 minutes and air drying. The shrinkage ratio of the fabric in hot water at 90 ° C means the area reduction ratio before and after immersing the fabric in hot water at 90 for 5 minutes in a free state. ing.

In addition, the strain-break length curve of the leather-like sheet and the strength in the machine direction and transverse direction when the fabric is stretched by 20% were measured by a stripron sample cut in a width of 1 cm in each direction using an instron. The measured stress-strain curve and the strength at 20% elongation of the curve. The sheet strength at the time of calculating the tear length is the stress value at a predetermined elongation of the stress-strain curve, and the tear length (km) = sheet strength (gZcm) Z sheet weight (g / m ² ) / Ten

Is calculated by The apparent density of a sheet is obtained by dividing the sheet basis weight by the sheet thickness and expressing the unit in gZ cm ³ . The sheet thickness was measured according to JISK65550. Example 1

Polyethylene terephthalate is used as the sea component, polyethylene terephthalate is used as the island component, and the ratio of the sea component to the island component is 35:65. mm, the number of islands: 16) A fibrous web of 350 gZm ² with a hot water shrinkage of 15.0% at 90 ° C is a 51 mm long polyethylene terephthalate. A 70 g / m ² reinforcing cloth made from spun yarn of fibers was laminated. The shrinkage rate of ultrafine fibers in hot water at 90 ° C is 23%. The web made of these fibers is a cross-wrapping machine that uses a low-weight web that has been opened with a card. , And laminated with the reinforcing cloth immediately after the pre-punch. Although the fiber web was entangled alone, the shrinkage in the vertical direction in hot water at 90 ° C was 22% and the shrinkage in the horizontal direction was 23%. On the other hand, the reinforcing fabric is made of a spun yarn of 40th count, and the final twist applied to the yarn is 800 TZm. This spun yarn is used as a raw, unset yarn, and is used for warp and weft yarns to produce plain weaves (weaving density: 60-inch inch, 50-inch Z inch). . The vertical tenacity of this plain fabric at 20% elongation was 10 kgZcm, and the horizontal tenacity was 5.7 kg / cm.

The laminate of the reinforcing fabric and the fiber web was subjected to a needle punching process of 1300 punches / cm ² from the fiber web side and 1300 punches / cm ^{2 from} the back side to obtain an entangled sheet. At this time, the sheet containing the reinforcing fabric was in a state in which both were tightly entangled integrally.

These sheets were treated in hot water at 90 ° C to shrink both vertical and horizontal by 20%. At this time, the fibers that could be converted to ultrafine fibers due to high shrinkage had a sheet with improved fiber density over the entire sheet. The sheet did not curl or wrinkle due to shrinkage.

Then, the sheet is preheated to a semi-molten state of the polyethylene, passed through a flat roll having a predetermined clearance, pressed, cooled, and simultaneously with the use of the fusion effect of the polyethylene to smooth the sheet surface and further reduce the sheet thickness. The fiber density in the bulk was improved.

Next, this sheet is immersed in a polyurethane urethane dimethylformamide (DMF) solution with a polyurethane concentration of 15% to impregnate the fibers and fiber spaces in the sheet with the polyurethane, and then coagulated in water. I let it. After that, the polyethylene component was extracted in a hot toluene to make the fibers ultrafine. The fiber after ultra-fine-tuning was 0.19 dr. At this time, the sheet is affected by the effect of the reinforcing fabric. It was possible to maintain a very small state of morphological change during the process. The entangled body of the ultrafine fiber web and the reinforcing cloth was brushed on the surface with sandpaper and then dyed to give a suede-like artificial leather-like sheet. At this time, the basis weight of the sheet was 519 g / m ² and the density was 0.45 gZcm ³ .

The tear length-strain curve calculated from the stress-strain curve per 1 cm width of both the sheet and the box on this sheet has the general shape shown in Fig. 1 and Fig. 2, and the deformation in the low strain region It was small and very excellent in form stability. In order to measure the number of twists of the spun yarn constituting the reinforcing fabric in the second sheet, the dyed sheet was immersed in a DMF solution kept at 50 ° C, and the attached polyurethane resin was dissolved and removed. The microfibers that had joined were peeled off. The number of twists of the spun yarn was 100 T / m in the evening yarn and 110 T / m in the weft yarn. Example 2

A shrinkage ratio in hot water at 90 C using a fiber web similar to that of Example 1 and a modified polyester having isophthalic acid changeability of 12 mo 1% as a reinforcing cloth was obtained at 90 C. A needle punch sheet was produced by performing the same operation as in Example 1 with a plain woven fabric produced by using a spun yarn having a twist number of 800 TZm in the horizontal direction. The strength of the plain fabric at 20% elongation was 11 kg / 'cm, the strength of the flat was 6.1 kg / cm, and the hot water shrinkage at 90 ° C was 20% The horizontal direction was 22%.

The shrinkage of this sheet in 9 (TC hot water was 21% in the evening direction and 24% in the horizontal direction.

Subsequent operations were performed in the same manner as in Example 1. The weight and density of the obtained sheet after dyeing were 559 g nom ² , 0.47 g, and '' cm ³ , respectively. The distortion curves were within the scope of the present invention. The breaking length-strain curve calculated from the stress-strain curve per 1 cm width of both the sheet and the side of this sheet has the approximate shape shown in Fig. 1 and Fig. 2. And small and very excellent in form stability. When the number of twists of the spun yarn in this sheet was measured, it was 1950 TZm in the evening yarn and 1.060 TZm in the weft yarn. The second leather-like sheet was excellent in form stability and had a soft texture as artificial leather. Example 3

The shrinkable fiber web is made of nylon and polyethylene terephthalate. Nylon and polyethylene terephthalate are alternately present in layers in a total of 11 layers. The thickness is 2 dr and the length is 5 1 The fiber web and the polyester reinforcing fabric of Example 1 were used with a fiber weight of 160 g / cm ^{2 and} a twist of 7500 T Zm. 0% elongation at Yute strong 8. 9 k gZ cm, ® co potent 5. 0 kgcm, Yute shrinkage 1 5% stacking a ® co shrinkage 1-8%), 5 0 punches / "cm ² The fiber was split and re-entangled by water entanglement, and the sheet was treated in 90 ⁼ C hot water for 5 minutes. Is 14% in the evening direction and 17% in the horizontal direction, and the web alone is entangled under the same conditions. Shrinkage rate after 5 minutes treatment with 9 0 ° C warm water of the resulting non-woven fabric, Yute direction 1 1% was ® co direction 1 3%.

Thereafter, the same processing as in Example 1 was performed except that the extraction step was not performed. And a sheet density 0. 4 0 8 gZ cm ³ in basis weight 4 9 ^0/2. The processability of this sheet was not particularly problematic, and the quality of the final sheet was excellent, and it was a high-quality suede tone. The number of twists of the spun yarn in the final sheet is 850 T / m, weft 903 TZm, and the tear length-distortion curve of the sheet is within the scope of the present invention as shown in FIGS. 1 and 2. The stability was excellent. Example 4

The shrinkable fiber is made of nylon and polyethylene terephthalate, and the nylon and polyethylene terephthalate are alternately present in layers in a total of 11 layers, with a thickness of 1.3 dr and a length of 3 A fiber binder was mixed with the composite spun fiber having a thickness of 40 mm / mm ² to make paper of 40 g / cm ² . The conjugate spun fibers were made to be easily dispersed in water. This papermaking web and the same fabric as the modified polyester reinforcing fabric of Example 2 were sandwiched between papermaking webs and subjected to the same hydroentanglement treatment as in Example 3. When this sheet was treated in hot water at 90 ° C for 5 minutes, it shrank by 18% in the evening and 17% in the horizontal direction. The shrinkage ratio of only papermaking ゥ etu was 12% in the evening and 10% in the width. The sheet was impregnated with a 2 °% solution of the emulsion and solidified by dry heat. After drying and curing at 130 ° C, the subsequent finishing treatment was performed in the same manner as in Example 2 to obtain a suede-like sheet. Basis weight ² 6 0 gZm 2, excellent apparent density 0.4 2 thin in gcm ³ and shape stability, the first view longitudinal breaking length one strain relationship Contact and relationship transverse breaking length one strain respectively and As shown in FIG. 2, the sheet was within the scope of the present invention. The number of twists of the spun yarn in this sheet was 11032 T / m, and the weft was 970 TZm. Comparative Example 1

The treatment was performed in the same manner as in Example 1 except that the number of twists of the spun yarn for the reinforcing fabric was set at 600 T / m. However, the shrinkage of the used web alone in hot water at 90 ° C was 8% in the evening direction and 7% in the weft direction. The shrinkage in hot water at 0 ° C is 5% in the evening direction and 5% in the horizontal direction. The laminated sheet consisting of both is well entangled by needle punching, but the shrinkage rate is 90% in hot water at 90 ° C, and the shrinkage rate is 6% in the horizontal direction. %Met. After preheating, the surface is smoothed by pressing and then impregnated with a polyurethane solution and wet-solidified, then the surface is brushed and further dyed, and the resulting sheet has a basis weight of 470 g Zm ² , apparent density was 0. 3 6 2 g / ' cm 3. As shown in FIGS. 1 and 2, the tear length-strain curve of this sheet is out of the range of the present invention, and although it is flexible, the change in shape in the low strain range is slightly. It was big. In addition, although the apparent density was probably due to the low density, it did not have the richness and luxury of natural leather.

The number of twists of the spun yarn in the reinforcing fabric taken out by the above-described method is as follows.

At 632 TZm, the weft was 640 TZm. Industrial applicability

As described above in detail in the examples and the like, according to the present invention, excellent morphological stability having high anti-deformation property in a low strain range while maintaining the sheet texture as artificial leather, A high quality leather-like fiber sheet can be obtained. The artificial leather thus produced is used, for example, for intellectual material use. In particular, it can be suitably used for surface materials such as chairs and sofas that require the anti-deformation property of the reinforcing cloth, and for materials that require high strength and high anti-deformation property, such as mechanical belts and abrasives. it can.

Claims

The scope of the claims

1. A fibrous structure in which a nonwoven fabric made of ultrafine fibers of 0.3 denier or less and a reinforcing fabric are entangled and integrated, and the entangled integrated product contains an elastic polymer; The strain up to the first peak in the evening direction of the body is 15% or more, and the breaking length-strain curve up to the first peak is sandwiched between the straight line passing through 〇A and the straight line passing through 〇C below. The strain up to the first peak in the horizontal direction is 20% or more, and the breaking length-strain curve up to the first peak passes through the following straight line passing through OA 'and 〇C' A leather-like sheet having a sheet density of 0.4 g / cm ³ or more in a range between straight lines.

D (strain (%), breaking length (km)) = O (0, 0), A (30, 2.0), C (5, 3, 5) horizontal (strain (%), breaking length (km)) = O (0, 0), A, (40, 1.5), C '(20, 2.5) The "break length" here is calculated by the following formula.

Breaking length (km) = Sheet strength (g / cm) / Sheet weight (g / m2) Z 10

2. Claim 1, in which the fracture length-strain curve up to the first peak in the evening direction is in the range between the straight line passing through 〇 and A-2 (30, 3.0) and the straight line passing through OC. Leather-like sheet.

3. The breaking length-strain curve up to the first peak in the horizontal direction is in the range between the straight line passing through 〇 and A'-2 (40, 2.0) and the straight line passing through 〇C. The leather-like sheet according to 1.

4. The leather-like sheet according to claim 1, wherein the density of the sheet one Bok is in the range of 0.43~0.51g / cm ^3.

5. The leather-like sheet according to claim 1, wherein the amount of the elastic polymer is 10 to 25% of the weight of the fibers constituting the leather-like sheet.

6. The reinforcing fabric is composed of yarn with a twist number of 650 to 280 T / m The leather-like sheet according to claim 1.

7. The leather-like sheet according to claim 1, wherein the reinforcing fabric is formed of a yarn having a number of twists of 800 to 1200 T / m.

8. The leather-like net according to claim 1, wherein the reinforcing fabric is made of spun yarn.

It consists of yarn composed of fibers whose shrinkage in hot water at 9.9 ° C is 10 to 30%, and its tensile strength at 20% elongation is 6 kg / cm or more, and At least one side of a reinforced fabric with a cohesive strength of 4 kgm or more is made of ultrafine fibers or ultrafine fibers having a fiber length of 3 to 150 mm, and is immersed in hot water at 90 after entanglement. Fiber webs having a shrinkage ratio of 10 to 30% in both cases are superimposed, and after heating and shrinking the fiber sheet in which the fabric and the fiber web are entangled and integrated, the elasticity is increased. A method for producing a leather-like sheet, comprising applying a polymer and, when the ultrafine-refinable fiber is a sea-island structure fiber, removing a sea component and ultrafine-refining.

10. The method according to claim 9, wherein the number of twists of the yarn constituting the reinforcing fabric is 550 to 2000 T / m.

11. The production method according to claim 9, wherein the number of twists of the yarn constituting the reinforcing fabric is from 65 to 900 T / m.

12. The production method according to claim 9, wherein the yarn constituting the reinforcing fabric is a spun yarn.

13. If the fiber length of the web is 20 mm or more, the difference in shrinkage in hot water at 90 ° C between the reinforcing fabric and the entangled fiber ゥWhen the fiber length is within the range of 0 to 6% in the horizontal direction and the fiber length is less than 20 nun, the difference in shrinkage is 0 to 20% in the horizontal direction and 0 to 1 in the horizontal direction. 10. The production method according to claim 9, which is in a range of 5%.

14. The method according to claim 9, wherein the yarn constituting the reinforcing cloth has a cotton count of 30 to 45.

15. The production method according to claim 9, wherein the shrinkage rate of the yarn forming the reinforcing fabric is in the range of 0.3 to 0.95 times the shrinkage rate of the weft yarn.

16. The woven fabric according to claim 9, wherein the woven density of the reinforcing fabric is in the range of 40 to 100 yarns / inch and the weft is 30 to 90 yarns / inch, and the yarn density of the yarn is higher than the weft yarn density. The manufacturing method as described.

17. The production method according to claim 9, wherein the strength value of the reinforced fabric at 20% elongation is 6 kg / cm or more, and 4 kg / cm or more.

It is composed of yarn composed of fibers having a shrinkage of 10 to 30% in hot water of 18.9.The vertical strength at 20% elongation is 6 kg / cm or more, and the horizontal strength is 4 An artificial leather reinforced fabric characterized by being at least kg / cm.

19. The artificial leather reinforcing fabric according to claim 18, wherein the number of twists of the yarns constituting the reinforcing fabric is 550 to 2000 T / m.

20. The artificial leather reinforcing cloth according to claim 18, wherein the number of twists of the yarns constituting the reinforcing cloth is from 65 to 900 T / m.

21. The artificial leather reinforcing fabric according to claim 18, wherein the yarn constituting the reinforcing fabric has a cotton count of 30 to 45.

22. The artificial leather reinforcing fabric according to claim 18, wherein the shrinkage ratio of the yarn forming the reinforcing fabric is in the range of 0.3 to 0.95 times the shrinkage ratio of the weft yarn.

23. The weaving density of the reinforcing fabric is in the range of 40 to 100 yarns per inch, 30 to 90 fibers per inch, and the warp yarn density is higher than the weft yarn density.

18. The fabric for reinforcing artificial leather according to item 18.