sliding material

Abstract

In order to provide a fabric that can suppress the thickness reduction caused by wear even under high load and high speed sliding conditions and therefore has excellent sliding properties when used as a sliding material while not prone to loosening between members and can be used on substrates, the invention is a fabric containing fluororesin fibers and para-aramid fibers (para-aramid) in at least one of the warp and weft yarns fiber) of fabrics and sliding materials with a concave height of 1150 μm or less in at least one side of the yarn exposed.

Description

[Technical Field]

[0001] This invention relates to fabrics and sliding materials. [Previous Technology]

[0002] In the past, technologies have been developed that utilize the low coefficient of friction of fluoropolymers to fiberize fluoropolymers, forming woven or nonwoven fabrics, and placing them between sliding components, thereby imparting low friction between the components. When the thickness of the sliding fabric decreases significantly due to wear, the clearance around the sliding components changes, resulting in a systemic loosening noise. Therefore, in addition to low friction and sliding durability, sliding fabrics are required to prevent significant thickness reduction due to wear even under harsh sliding conditions.

[0003] Furthermore, fluoropolymers generally lack adhesion. Therefore, when attaching a sliding material to a substrate to impart sliding properties, it is important to ensure adhesion in addition to ensuring the low friction or sliding durability of the sliding material.

[0004] As a technique for imparting low friction to sliding fabrics, for example, Patent Document 1 discloses a self-lubricating fabric, which is a fabric comprising a composite yarn formed of fluoropolymer fibers and other fibers, wherein the surface area of ​​the other fibers on one side of the fabric accounts for 0 to 30% of the total surface area of ​​the composite yarn.

[0005] When used as a sliding material, a technique for suppressing loosening noise between components is disclosed, for example, in Patent Document 2, a fabric in which fluoropolymer fibers are alternately arranged with other fibers, and the compression of the fabric is 25 μm or less. [Prior Art Documents] [Patent Documents]

[0006] Patent Document 1: International Publication No. 2017 / 020821; Patent Document 2: International Publication No. 2018 / 074207 [Summary of the Invention]

[0007] [The problem the invention aims to solve]

[0008] However, the fabrics described in the patent literature 1 have a high proportion of fluororesin fibers in the composite yarn and cannot adequately inhibit the spitting of the abrasive powder of the fluororesin yarn when exposed to high-speed sliding at high loads. Furthermore, the proportion of fluororesin fibers is high, and as a result, when low thermal shrinkage fibers such as para-aramid fibers are selected as other yarns, due to poor thermal shrinkage with fluoresin fibers, the bumps after heat treatment become larger, there is a problem of succession or sliding properties.

[0009] For the fabrics recorded in the patent literature 2, although the compression amount in the thickness direction during load loading is small, thus suppressing the loose action between members, there is still improvement in the thickness reduction after sliding under high load and high speed sliding.

[0010] Furthermore, a review of sliding properties was also conducted in any of the above patent literatures, but the specific effects imparting sliding properties were not elucidated.

[0011] Therefore, the subject matter of the present invention lies in providing a fabric that combines low friction, sliding durability, and adherence that suppresses the wear-induced thickness reduction even under sliding conditions of high load and high speed.

[0012] The subject matter lies in providing a fabric which resorts to the use of the fabric of the present invention as a sliding material with excellent sliding properties, can function as a sliding material for a long period of time, while also inhibiting the loose action between members, and can be subsequently used in the substrate. [Means used to solve problems]

[0013] To solve the subject, the invention has the following configuration.

[0014] A fabric in which a joint yarn comprising fluororesin fibers and para-aramid fibers in at least one of the warp and weft yarns has a concave height of 1150 μm or less in at least one side of the preceding joint yarn.

[0015] The aforementioned fabric, which has a thickness of 1.3mm or less.

[0016] The fabric of the foregoing, in which the warp and weft yarns contain the foregoing joint yarn.

[0017] The fabric, wherein the fabric is a multilayer fabric comprising the outermost 1st face and the outermost 2nd face on the opposite side to the 1st face, and at least one of the warp and weft yarns of the first face contains the aforementioned joint yarn.

[0018] The aforementioned fabric, wherein the ratio (CF1 / CF2) of the coverage factor (CF1) of the first face to the coverage factor of the second face (CF2) is less than 1.

[0019] The preceding fabric, wherein the mass ratio of the fluororesin fibers occupied in the whole of the preceding fabric is less than 20% by mass.

[0020] A sliding material comprising the aforementioned fabric.

[0021] The sliding material, wherein at least one side of the aforementioned joint yarn is exposed and the bump height is less than 1150 μm is treated as the sliding surface [effect of the invention].

[0022] According to the invention, a fabric and sliding material can be provided, which combines low friction, sliding durability, adhesion, and can inhibit the thickness reduction caused by wear even under high load and high speed sliding conditions. [Implementation Method]

[0024] [The form used to implement the invention]

[0025] The fabric of the present invention comprises a joint yarn of fluororesin fibers and para-aramid fibers in at least one of the warp and weft yarns.

[0026] In addition to the method of making a synthetic yarn, a composite form of a fluororesin fiber and a para-aramid fiber is also considered, such as: a construction where fluororesin fibers are used in warp (or weft) and para-aramid fibers are used in weft (or warp); However, the configuration of the use of fluororesin fibers in the warp (or warp) and the use of para-aramid fibers in the weft (or warp), the configuration of alternating configurations of fluoresin fibers and para-aramid fibers, in the parts of low-strength fluoresin fibers locally present (e.g In the portion of the fluororesin fiber used for the warp (or weft) through the continuous configuration, the intersection of the fluororesin fiber used for the warp and the fluororesin fiber used for the weft), where the fluororesin fiber is prone to early breakage, there is the possibility of becoming the starting point for fabric breakage. Therefore, it is difficult to obtain satisfactory performance when extremely excellent sliding durability is required in high load and high speed. When made into a double-layer fabric that is completely separated from the fluororesin fiber layer and the para-aramid fiber layer, the fluoresin fiber layer will wear while sliding, making it difficult to suppress the thickness reduction.

[0027] On the other hand, the woven fluororesin fibers and para-aramid fibers are integrated before being made into composite yarns and configured in the fabric, thereby making the fluororesin fibers and para-aramid fibers adjoined, so that the fluorine abrasive powder due to sliding easily transfers and attaches to the para-aramid fibers to form a self-lubricating film.

[0028] In addition, as a form in which fluororesin fibers and para-aramid fibers are integrated before weaving, in addition to composite yarns made by combining fluororesin fibers and para-aramid fibers, one can also exemplify short yarns that treat para-aramid fibers as core yarns and wrap around them with fluororesin fibers as sheath yarns, or short fibers of fluororesin fibers and para-aramid fibers. However, the cladding yarns are selectively abraded and the thickness reduction easily becomes significant due to the fact that the fluororesin fibers will be biased to exist on the sheath side. Blended yarns are difficult to obtain sufficient entanglement between fluororesin fibers and para-aramid fibers and sufficient durability during sliding due to the low friction properties of fluororesin fibers.

[0029] On the other hand, the synthetic yarn is used as the bone material to maintain strength and inhibit abrasion, while the surrounding fluororesin fibers become abrasive powder and easily transfer attached to the parasite fibers, in addition to achieving excellent low friction and sliding durability.

[0030] In the joint yarn composed of fluororesin fibers and para-aramid fibers, the spinning coefficient k of the number (complex number) at the time of jointing is preferably above 1000 and less than 25000, preferably above 1000 or less than 10000, and preferably above 2000 or less than 7000.

[0031] Here, the coefficient of pin turns k is obtained by taking the number of pins per 1m as T[t / m] and the fiber of the joint as D[dtex]. k=T×D0.5

[0032] The joint yarn composed of fluororesin fibers and para-aramid fibers is preferably yarn of fluororesin fibers or para-aramid fibers before jointing. By using the yarn, the open fibers of the para-aramid fibers caused by friction in weaving can be inhibited, thus preventing the low-friction phenomenon by covering the fluororesin fibers in the yarns by covering the fluororesin fibers in the yarn. At this time, the rotation coefficient of the counterpoint aramid fiber before the joint is preferably above 500 and below 5000. Furthermore, if it is 500 or more or less than 3000, then in addition to the above effect, since the strength of the para-aramid fibers will be improved by the yarn, so that the para-aramid fibers will exist strongly as a skeleton fiber when becoming a fabric. Special is 900 above 3000 below. If the gyrus rotation coefficient of the counter-aligned aramid fiber is greater than 5000, there is a risk that the strength will be reduced compared to before the yarn. The step of simply adding to the raw yarn of the desired fineness may be adopted when knitting the opposite aramid fibers, or the step of knitting the yarns of smaller fibers than the desired fineness with each other may be adopted. For example, when preparing a logarithmic aramid fiber with a length of 33[t / m] and a fiber of 850[dtex], the logarithmic yarn with a fiber of 850[dtex] may be pruned at 33[t / m], or two raw yarns with a fiber of 425[dtex] can be pruned at 33[t / m].

[0033] The yarn length difference can be adjusted in conjunction with the thermal shrinkage difference between the fluororesin fiber and the para-aramid fiber in the processing steps and the maximum temperature exposed on use. For example, the maximum temperature exposed at the processing step and use is 200°C, at which temperature the difference in thermal shrinkage between the fluororesin fiber and the para-aramid fiber is 10%, the yarn length of the fluororesin fiber can be made 10% longer than that of the para-aramid fiber at the time of jointing. The effect of the present invention can be easily obtained by becoming such a state, which can suppress the concave and convex exhibition caused by poor thermal contraction.

[0034] In the fabric of the present invention, the joint yarn of the fluororesin fiber and the para-aramid fiber is included in at least one of the warp and the weft yarn, but preferably in the warp and the weft yarn. Also, it can be interwoven with other fibers.

[0035] In the present invention, it is found that the thickness reduction can be significantly inhibited by selecting para-aramid fibers as interweaving objects of fluororesin fibers compared to the use of PPS fibers or other fibers such as inter-aramid fibers and liquid crystal polyester fibers. When fabrics made of fibers other than para-aramid fibers as high-strength fibers are used for sliding materials, for example, more fluororesin fibers are configured on the sliding surface and more high-strength fibers are configured on the non-sliding surface using the design of woven structures, etc.

[0036] On the other hand, as in the present invention, by combining the para-aramid fibers with the fluororesin fibers, so that the para-aramid fibers exert an extremely high aggregate effect, they can be made into a fabric that provides a sliding material that not only achieves sliding durability but also suppresses the thickness change caused by wear. Furthermore, counterpoint aramid fibers, which also have excellent processability, are cheaper than inorganic fibers such as carbon fibers, and can be easily prepared for fabrics suitable for thin sliding materials. Furthermore, it can inhibit the fluffing caused by friction when inorganic fibers become a subject. Therefore, even when not made as a composite material dipped in resin in this fabric content, but used as a fabric monomer, such as when using the sliding material by attaching it to the construct, it can prevent impurities such as fine hairs from mixing into the system of the construct.

[0037] The fabric of the present invention has a bump height of 1150 μm or less in at least one side of the exposed yarn as described above. In addition, here the so-called “in at least one side of the synthetic yarn exposed” concave height satisfies the above range, means that when the synthetic yarn is exposed on one side only is in the face, when the synthetic yarn is exposed in both, it is in the exposed face, and when equally exposed in either side, the convex height satisfies the above range.

[0038] The thermal shrinkage of fluororesin fibers is greater than that of para-aramid fibers, after wet heat treatment or dry heat treatment, due to poor shrinkage, para-aramid fibers present more parts to form convexity, fluororesin fibers present more parts form concaves, easy to produce bumps. If bumps are thus produced, the convex parts containing mostly para-aramid fibers in the initial stages of sliding will selectively easily contact the subject material. If the bump becomes larger than a certain amount, the physical interaction between the convex part and the hook hanging between the object material by the surface roughness of the object material becomes larger, and there is a tendency for the friction coefficient to rise. Furthermore, at this time the wear speed easily becomes faster due to the stress concentrated in the convex part. Furthermore, if the indentation is too large, the adhesive agent cannot be impregnated into the concave part during the subsequent processing, and the substantial ensuing area decreases without easily obtaining the adhesion. In order to obtain the adhesive area, the adhesive application amount increases or the pressing pressure increases, the adhesive content of the convex part will become excessively more than the surrounding area, the adhesive exudation to the sliding surface and become the cause of the deterioration of sliding properties. Based on the above point of view, the height of the bump is less than 1150μm. Preferably below 1000μm, preferably below 800μm. Excellent conditions are below 500μm. The substantial lower limit of the bump height is 0μm.

[0039] The better mass ratio of fluororesin fibers occupied in the synthetic yarn of the present invention is 3 to 97 mass %. If the mass ratio of the fluororesin fibers occupied in the composite yarn is greater than 97 mass%, there are too few para-aramid fibers that can capture the abrasive powder as an aggregate relative to the amount of fluororesin abrasive powder that occurs, and it is difficult to suppress the thickness change. The mass ratio of the fluororesin fibers occupied in the yarn is preferably 80 mass % or less, especially 60 mass % or less. If the mass ratio of the fluororesin fibers occupied in the composite yarn is less than 3 mass%, there is too little fluororesin abrasive powder transferred attached to the para-aramid fibers, and adequate low friction is not obtained. The mass ratio of the fluororesin fibers occupied in the joint yarn is preferably 20 mass% or more, and more preferably 40 mass% or more.

[0040] The thickness of the fabric of the present invention is preferably 1.3mm or less. By using a joint yarn of fluororesin fibers and para-aramid fibers in at least one of the warp and weft yarns, the thickness reduction rate of the fabric is significantly reduced even under high load and high speed sliding, thus obtaining adequate sliding durability even for small thicknesses. The reasons for the decrease in the thickness of the fabric can be cited as: fiber wear・break and it is squeezed out of the system, each single yarn fills the gap due to pressure or sliding and changes into the most densely packed construction. The decrease in thickness due to the latter will become larger with the absolute amount of voids present in the fabric. that is, the smaller the thickness of the fabric, the more the thickness reduction can be suppressed. Among them, the preferable is a thickness of less than 1.2mm, more preferably a thickness of less than 0.8mm, especially preferably less than 0.5mm, and extra preferably less than 0.3mm. If the thickness is too small, it will become difficult to obtain the desired wear durability, so the thickness is preferably 0.05mm or more, preferably 0.1mm or more, and extra preferably 0.2mm or more.

[0041] The woven structure of the fabric of the present invention is not particularly limited and may adopt a diagonal structure or a fringe structure, a flat structure and a variation thereof. Among them, if it is a flat structure, the thickness can be reduced relatively easily and it becomes easy to suppress the thickness reduction due to sliding, which is preferable.

[0042] The fabric of the present invention may be selected as a multilayer structure or the like as a single layer structure or a double layer structure according to the required characteristics. In case of a single-layer structure, the thickness can be reduced relatively easily and it becomes easy to suppress the thickness reduction caused by sliding. When making a multilayer fabric with a multilayer structure such as a double-layer structure, the outermost side is treated as the 1st side, and the outermost side of the opposite side to the 1st side is treated as the 2nd side, preferably in at least one of the warp and weft yarns of the first side. Furthermore, when the multilayer fabric is used for sliding materials, it is preferable to set the 1st side as a sliding surface. As a sliding material, when only the 1st face of one side of the multilayer fabric is used as the sliding surface, the 2nd face is a non-sliding surface. In multilayer fabrics, the fibers used for the layer comprising the non-sliding surface may be suitably selected according to the purpose, but it is easy to balance sliding durability and sedimentation by the use of para-aramid fibers. From the point of thickness, the better is the double layer fabric. If it is a double-layer structure, sufficient thickness can be maintained for a long time even if the thickness is reduced due to sliding, which easily improves sliding durability. As the above-mentioned double layer structure, when set as a double layer fabric comprising the 1st and 2nd sides, preferably a joint yarn containing fluororesin fibers and para-aramid fibers in at least one of the warp and weft yarns of the first side of the preceding face.

[0043] When the bilayer structure is selected, the ratio (CF1 / CF2) of the coverage factor (CF1) of the first side to the coverage factor of the second side (CF2) is preferably less than 1. The coverage factor herein refers to that which is obtained by resorting to the following formula. Coverage factor = (total warp fiber [dtex]) 0.5 × warp density [strip / 2.54cm] + (total weft fiber [dtex]) 0.5 × weft density [strip / 2.54cm]

[0044] In addition, the above total fiber in calculating the coverage factor is converted by resorting to the specific gravity of the fiber species. This technique is for fabrics containing fluororesin fibers and para-aramid fibers, and as fluororesin fibers, if polytetrafluoroethylene fibers are used as an example, their specific gravity is 2.3, which is greater than the specific gravity of para-aramid fibers of 1.4, so the actual fiber diameter is larger for para-aramid fibers for the same fiber. Therefore in order to reflect the actual fiber diameter, the coverage factor was calculated by converting the fineness of the fluororesin fiber using the para-aramid fiber benchmark. Also, taking the specific gravity (1.4) of the para-aramid fibers as a benchmark, the converted fiber T with respect to the specific gravity D, fiber T0 using the original yarn is converted by resorting to the following formula. T=T0×1.4 / D

[0045] For example, the total fiber T of the synthetic yarn composed of a fluororesin fiber 440dtex with a specific gravity of 2.3 and a para-aramid fiber 800dtex is obtained by means of the following formula. T=440×1.4 / 2.3+800=1067

[0046] By making the ratio of the coverage factor (CF1) of the 1st face (CF1) to the 2nd face (CF2) less than 1, the indentation of the 1st face (when used as a sliding material, the

[0047] As mentioned above, there is a tendency that the greater the thermal shrinkage difference between the fluororesin fiber and the para-aramid fiber, the greater the unevenness of the fabric. The difference in yarn length due to thermal shrinkage is constrained by the intersection of the warp and weft yarns, forming a convexity in the longer part of the yarn length and concave in the shorter part. When the coverage factor is large, which means that the fiber is large or the density is high, few voids can be adsorbed due to the difference in yarn length due to thermal shrinkage, so the bump becomes larger. On the other hand, the coverage factor is small, the restraints of the warp and weft yarns are weak, and it is difficult to maintain the fabric construction during sliding, and the sliding durability is reduced. Therefore, by setting the layer containing the 1st face to a configuration with a low coverage factor and the layer containing the 2nd face to a configuration with a high coverage factor, long-term sliding durability can be obtained while suppressing the bumps of the 1st face while maintaining the fabric configuration on the 2nd face. In addition, when the coverage factor of the first side is low, the voids become more, forming a convexity in the part where the fiber is present, and concave the part where the voids are present, there is a situation where the voids are produced. At this time since there is sufficient voids, the warp and weft yarns expand to the interlaced weft and warp yarns and the fibers expand flatly. The bump due to low coverage factor and the generation of voids is less than the bump due to poor thermal shrinkage.

[0048] Based on the above point of view, the ratio (CF1 / CF2) of the coverage factor (CF1) of the 1st side to the coverage factor of the 2nd face (CF1 / CF2) is preferably less than 1 and preferably less than 0.8 when the bilayer structure is selected. When the coverage factor (CF2) of the 2nd side is too large, the weavingness deteriorates, the coverage factor (CF1) of the 1st side is too small, the number of interleaving points is excessively reduced relative to the thickness of the yarn, and only the constituent fibers of the 1st side become easy to bloom due to sliding. Therefore, CF1 / CF2 is preferably greater than 0.2 and more preferably greater than 0.4.

[0049] When selecting a multilayer fabric with a multilayer structure such as a double layer structure, the nodular yarn is preferable to select the paraaligned aramid fibers. The nodular yarn referred to here refers to a yarn that ties the 2 layers tightly, which constitutes a multilayered tissue such as a double-layered tissue. For example, when the warp yarn of face 1 is regarded as a knotted yarn, the knotted yarn has the usual portion forming the 1st face and a knotted portion intertwined with the weft yarn of the 2nd face. The yarn in the nodular portion is more circuitous than the usual portion and the yarn becomes a more tense state than the usual portion. If a combined yarn or fluororesin fiber of fluororesin fiber and para-aramid fiber is used in the nodular part, the tension in the nodular part becomes stronger due to thermal contraction during heating, pushing up the already tangled weft and easily becoming a convex part. According to the above, nodular yarns are preferable to select para-aramid fibers with low heat shrinkage.

[0050] The fabric of the present invention does not particularly limit the mass ratio of fluoropolymer fibers in the entire fabric, but by setting the mass ratio of fluoropolymer fibers in the entire fabric to 20% by mass or less, even in cases where heat treatment is included in the process, the unevenness height can be reduced, which is preferable. By reducing the mass ratio of fluoropolymer fibers with greater heat shrinkage compared to the mass ratio of para-aramid fibers, unevenness caused by differential shrinkage after heat treatment can be suppressed. If the composite is made of fluoropolymer fibers other than para-aramid fibers, the coefficient of friction will increase and the durability will decrease due to the reduction of fluoropolymer fibers. However, by selecting para-aramid fibers, which exhibit a very high reinforcing effect, excellent sliding properties can be achieved even when the mass ratio of fluoropolymer fibers is relatively low. From the viewpoint of reducing unevenness height, the mass ratio of fluoropolymer fibers in the entire fabric is preferably 20% by mass or less, more preferably 15% by mass or less, and particularly preferably 10% by mass or less. The preferred mass percentage of fluoropolymer fiber is 1% or more, more preferably 3% or more, and ideally 5% or more.

[0051] In this invention, the fluororesin used as a component of the fluororesin fiber can be any monomer unit containing one or more fluorine atoms in its main chain or side chain. Preferably, it is composed of monomer units with a large number of fluorine atoms.

[0052] The monomer unit containing one or more fluorine atoms in the repeating structural unit of the polymer preferably contains 70 mol% or more, more preferably 90 mol% or more, and even more preferably 95 mol% or more.

[0053] As a monomer containing one or more fluorine atoms, examples of fluorine-containing ethylene monomers include tetrafluoroethylene, hexafluoropropylene, and chlorotrifluoroethylene, among which at least tetrafluoroethylene is preferred.

[0054] As a fluoropolymer, polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-p-fluoroalkyl vinyl ether copolymer (PFA), polychlorotrifluoroethylene (PCTFE), ethylene-tetrafluoroethylene copolymer (ETFE) and other types of two or more can be used alone or in combination.

[0055] In fluororesins containing tetrafluoroethylene units, from the perspective of sliding characteristics, it is preferable to have a higher content of tetrafluoroethylene units, preferably a copolymer of tetrafluoroethylene with a total content of 90 mol% or more (preferably 95 mol% or more), and most preferably a polytetrafluoroethylene fiber that is regarded as a homopolymer of tetrafluoroethylene.

[0056] As for the form of the fluoropolymer fiber used in the present invention, either a monofilament composed of a single filament or a multifilament composed of multiple filaments can be used, but from the viewpoint of weaving properties or the surface texture when it becomes fabric, multifilament is preferred.

[0057] Furthermore, the total fineness of the fluoropolymer fibers used in this invention is preferably in the range of 50 to 6000 dtex. More preferably, it is in the range of 500 to 5500 dtex, and even more preferably, it is in the range of 400 to 1500 dtex. If the total fineness of the fibers constituting the fabric is 50 dtex or more, a certain degree of fiber strength can be guaranteed, and thread breakage during weaving can be reduced, thus improving processability. If it is 6000 dtex or less, good processability during weaving can be obtained.

[0058] The smaller the dry heat shrinkage rate of the fluoropolymer fiber used in this invention, the smaller the difference in heat shrinkage between it and the para-aramid fiber, which can suppress the appearance of unevenness after heating, and is therefore preferable. From this point of view, the dry heat shrinkage rate is preferably 15% or less, more preferably 10% or less, and particularly preferably 5% or less. The practical lower limit of the dry heat shrinkage rate is 0%. The dry heat shrinkage rate of the fluoropolymer fiber can be appropriately controlled by methods commonly used in the industry, such as oxidation treatment or heat treatment after stretching. The above-mentioned dry heat shrinkage rate is a value measured by the methods described later.

[0059] The form of the para-aramid fiber constituting the fabric of the present invention is not particularly limited, and either filament (long fiber) or staple fiber (spun yarn) can be used. However, from the viewpoint of tensile strength or tensile stiffness, filament is preferred. Furthermore, either monofilament composed of one filament or multifilament composed of multiple filaments can be used. If it is multifilament, the surface area is large, so the fluorinated abrasion powder generated by the wear of fluoropolymer fiber A can easily transfer and adhere to fiber B, which is particularly preferred.

[0060] The total fineness of the para-aramid fibers is preferably in the range of 50 to 4000 dtex, more preferably in the range of 200 to 4000 dtex, and even more preferably in the range of 800 to 3300 dtex. If the total fineness of the fibers constituting the fabric is 200 dtex or more, the fiber strength is high, which can not only suppress fiber breakage during abrasion but also reduce thread breakage during weaving, thus improving processability. If it is below 3300 dtex, the surface roughness of the fabric is small, which can suppress the effect on low friction.

[0061] As mentioned above, the unevenness of the fabric can easily affect the shrinkage behavior of fluoropolymer fibers and para-aramid fibers. Therefore, in post-weaving processing, temperature and humidity are controlled in a way that makes the unevenness within the range specified in this invention. As long as the resulting fabric falls within the range specified in this invention, the post-processing method is not limited. In order to make the unevenness within the range specified in this invention through the thermal process in post-processing, it is preferable to choose a method that does not apply heat treatment or to suppress the heat treatment conditions. Specifically, by reducing the temperature or shortening the time of wet heat treatment or dry heat treatment, setting it to wet heat treatment only, setting it to dry heat treatment only, etc., the heat treatment conditions can be mitigated, and the appearance of the unevenness can be controlled. In the fabric design for obtaining the desired fabric, the post-processing conditions can be determined in light of the above, as long as they are in a way that makes the unevenness within the range specified in this invention.

[0062] The wet heat treatment mentioned here refers to scouring, relaxation, dyeing, or other steps performed for the purpose of cleaning the fabric or removing residual stress. Such treatment can suppress the unevenness caused by the difference in heat shrinkage between fluoropolymer fibers and para-aramid fibers. Furthermore, since careful attention must be paid to the conditions of fabric cleaning and scouring, sizing without weaving is preferable.

[0063] The dry heat treatment mentioned here refers to the drying step, heat setting step, and post-coating drying step following the above-mentioned scouring step, relaxation step, and dyeing step. By paying attention to the above, the unevenness caused by the difference in heat shrinkage between the fluoropolymer fiber and the para-aramid fiber can be suppressed.

[0064] To further improve the abrasion resistance of the aforementioned fabric, a resin may be coated onto the fabric. Here, the resin used may be a thermosetting resin or a thermoplastic resin. While there are no particular limitations, as a thermosetting resin, phenolic resin, melamine resin, urea resin, unsaturated polyester resin, epoxy resin, polyurethane resin, diallyl phthalate resin, silicone resin, polyimide resin, vinyl ester resin, or modified resins thereof may be preferred. As a thermoplastic resin, vinyl chloride resin, polystyrene resin, ABS resin, polyethylene resin, polypropylene resin, fluoropolymer resin, polyamide resin, polyacetal resin, polycarbonate resin, polyester resin, acrylic resin, and even synthetic rubbers or elastomers such as thermoplastic polyurethane, butadiene rubber, nitrile rubber, nylon rubber, and polyester elastomers may be preferred. Among these, resins with phenolic resin and polyvinyl butyral resin as the main components, unsaturated polyester resin, vinyl ester resin, polyethylene, polypropylene, and other polyolefin resins and polyester resins are more suitable in terms of impact resistance, dimensional stability, strength, and price. In these thermosetting and thermoplastic resins, various commonly used additives may be included to improve productivity or characteristics for industrial purposes, applications, manufacturing steps, or processing steps. For example, modifiers, plasticizers, fillers, release agents, colorants, and diluents may be included. Furthermore, the term "main component" here refers to the component with the largest mass ratio among the components other than the solvent. In the case of resins with phenolic resin and polyvinyl butyral resin as the main components, it means that the mass ratio of these two types of resins is the first and second (in a different order) largest.

[0065] As a method for coating resin onto the aforementioned fabric, in the case of liquid resin, solvent-based resin, or water-based resin, coating can be performed by methods such as spraying, roller coating, knife coating, corner wheel coating, gravure coating, flexographic printing, brush coating, melt extrusion deposition, etc. Furthermore, in the case of powdered resin particles, methods such as applying static electricity to coat them can be used. After coating, the solvent can be blown away, or the material can be heat-cured, or melt-formed into a film. At this time, heat treatment can be performed as needed. From the viewpoint of reducing the heat treatment temperature and suppressing unevenness, a process with low moisture adhesion is preferred; specifically, methods such as spraying, flexographic printing, and brush coating are suitable.

[0066] Lubricants may also be added to the fabric of the present invention as needed. There are no particular limitations on the type of lubricant, but silicone-based lubricants and fluorine-based lubricants are preferred.

[0067] The fabric of the present invention thus obtained has both low friction and sliding durability, as it is a fabric using a synthesized yarn of fluororesin fiber and para-aramid fiber and the bump is suppressed. Therefore, in applications where the fabric of the present invention is difficult to use for a long period of time due to high-speed sliding under high load, in addition to exerting higher sliding durability than before, it can also suppress the loose action, and is easily attached to the substrate. Furthermore, when using the fabric of the present invention as a sliding material, it is preferable to set at least one side of the preceding joint yarn exposed and having a bump height of less than 1150 μm as a sliding surface. [Example]

[0068] In the following, embodiments of the present invention together with comparative examples are described.

[0069] Furthermore, the determination methods for various characteristics used in this embodiment are as follows.

[0070] (1) Fiber The total fiber was determined according to method 8.3.B (simplified method) of JIS L1013:2010 "Test Method for Chemical Fiber Filament Yarns". In addition, when determining the total fibers of the fibers contained in the fabric, the decomposition yarn was removed from the fabric and the determination was performed. However, when the decomposed yarn cannot ensure the amount of yarn required for the above assay, the results of the maximum length and number of trials that can be ensured are substituted.

[0071] (2) Weave density According to 8.6.1 of JIS L1096:2010 "Test Methods for Grill Fabrics for Shuttle Weaves and Knits", the sample was placed on a flat stage to remove unnatural wrinkles and tension, and for different parts, the number of strips of warp and weft yarn contained in the 50mm interval was calculated.

[0072] (3) Thickness The thickness after standing for 10 seconds at 23.5 kPa was determined according to method 8.4.A of JIS L1096:2010 "Test Method for Grid Fabrics for Shuttle Fabrics and Knitted Fabrics".

[0073] (4) Bump height The sample was placed on a flat stage to remove unnatural wrinkles and tension, and an area of ​​25mm × 25mm was photographed by 3D linkage observation with a digital microscope (“VHX-7000” by KEYENCE). The height difference between the 2 points of the maximum height and the lowest height in the region was defined as the bump height. In addition, when the joint fabric is exposed on only one side of the sample, set with that side facing up ・Observe the sample. When the joint yarn is exposed on both sides, set with the exposed side facing up ・Observe the sample. Set up with either side facing up when exposed equally ・Observe the sample. The above assay was performed at 5 of each sample, and the average value of 3 points other than the maximum and minimum values ​​was calculated.

[0074] (5) Dynamic friction coefficient According to method A of JIS K7218:1986 "Sliding and Wear Test Method for Plastics", the fabric is sampled 30mm long and 30mm wide on a SUS plate of the same size with a thickness of about 3mm, loaded with the face of the bump height determined in (4) described above and the aforementioned ring sliding, loaded and fixed to the sample holder. The subject material was a hollow cylinder-shaped ring made with an outer diameter of 25.6mm, an inner diameter of 20mm, and a length of 15mm made in S45C. Grind the surface of the above ring with sandpaper and adjust the surface roughness Ra=0.8μm±0.1. In the determination of roughness, a roughness tester ("SJ-210" made by MITUTOYO) was used. The ring wear tester was tested using A&D made “MODEL: EFM-III-EN” at friction load: 10MPa and friction speed: 400mm / s to determine the sliding torque and calculate the average value of the friction coefficient until fracture.

[0075] (6) Sliding endurance distance In the ring wear test described above, the cumulative sliding distance up to fracture is defined as the sliding endurance distance, which continues sliding until the fabric breaks.

[0076] (7) Speed ​​of thickness reduction In the above ring wear test, the test was stopped 1 minute after the start of sliding (sliding distance 24m), after removing the sample, a section of the sliding part was cut out, and a digital microscope (made by KEYENCE "VHX-7000") was used to observe the section to determine the thickness D1 after sliding. In addition, a new sample was prepared by applying a load: 10MPa and standing for 1 minute by means of a ring abrasion testing machine. The sample was similarly removed, a section of the pressurized part was cut, and the section was observed using a digital microscope (“VHX-7000” made by KEYENCE) to determine the thickness D0. The thickness reduction velocity D [μm / min] is found by resorting to the following equation. D=D0-D1

[0077] In addition, the new sample uses the same kind of sample as that of the supply ring abrasion test and uses samples taken from as close a location as possible.

[0078] (8) Adhesion According to JIS K6850: The fabric is sampled with a length of 100mm and a width of 25mm, and SS400 boards with a thickness of 15mm, a length of 100mm and a width of 25mm are prepared as the subject material. An epoxy additive ("2088E" made by THREEBOND, Inc.) was used in the adductant. Apply the adhesive uniformly on the SS400 plate with a coating amount of 150 g / m2 and overlap length of 12.5 mm, where the fabric is superimposed to the subject material in such a way that the face on the opposite side of the face determined for the bump height of the fabric in (4) above is superimposed, a pressure of 16 kPa is applied and allowed to stand for 48 h. For the obtained samples, the tensile shear followed strength was calculated by dividing the maximum value of the force at failure by the next area using a tensile testing machine (“5965” made by INSTRON) at a tensile speed of 5mm / min.

[0079] (9) The mass ratio of the fluororesin fibers occupied in the yarn yarn After cutting the fabric into warp 200mm × 200mm latitude, the warp and weft yarns are decomposed to obtain the decomposed yarn. For the respective warp and weft decomposition yarns, the mass of each was determined by arbitrarily selecting 5 joint yarns from the resulting decomposition yarns and decomposing them into fluororesin fibers and para-aramid fibers. Taking the sum of the masses of the five yarns as W and the sum of the masses of the five yarns as WF, the mass ratio α of the fluororesin fibers occupied in the yarns is calculated by the following calculation formula. α=WF / W×100 [mass%] However, when the decomposed yarn cannot ensure the amount of yarn required by the above assay, the results of the maximum length and number of trials that can be ensured are substituted.

[0080] (10) The mass ratio of the fluororesin fibers occupied in the whole fabric of the fabric After cutting the fabric into warp 200mm × latitude 200mm, the warp and weft yarn are broken down to determine the total mass W of the decomposed yarn. Then, only the syncope yarns were selected among the decomposed yarns, and the total mass W1 of the syncope yarns in the fabric was determined. Then, fluororesin fibers that were not synthesized yarn but present alone in the fabric were selected and the total mass W2 was determined. The mass ratio Y of the fluororesin fiber A in the fabric was calculated by the following formula. α uses the value α determined in the preceding term (9). Y=(W1×α / 100+W2) / W×100[mass%]

[0081] However, when the decomposed yarn cannot ensure the amount of yarn required for the above assay, the results of the test performed at the maximum length and number of trials that can be ensured are substituted.

[0082] (11) Dry heat shrinkage was determined using fluororesin fibers by means of the following methods.

[0083] The sample was folded in half and knotted to make a circular sample. The length of the ends of the looped sample was determined by applying an initial load (6% load of the fiber (g)) to the sample. The initial load was unloaded, heat-treated in a desiccator at 230°C for 30 minutes, removed and cooled to room temperature. The length of the ends of the circled sample was then determined by applying a further initial load.

[0084] By calculating the dry heat shrinkage rate by the following formula, the average of the three times is rounded to 1 decimal place below. ΔL=(L1-L2) / L1×100

[0085] Here, ΔL: dry heat shrinkage (%), L1: length before heat treatment (mm), L2: length after heat treatment (mm)

[0086] Example 1 PTFE fiber with a total fiber of 1330dtex and a single yarn count of 180 filaments (made from Toyoflon (registered trademark), 9% dry heat shrinkage when heated for 30 minutes at 230°C) and a total fiber of 880dtex, Counterpoint aramid fibers of single yarn number 534 filament (made of "Kevlar" (registered trademark) Toray-DuPont (shares)) were kneaded at 81t / m to obtain the joint yarn. In warp yarns are not implemented to improve weaving properties of pulping, etc.

[0087] Comparative Example 1 The fabric of Example 1 was refined for 20 minutes in a refinement tank at 80°C, dried at 130°C for 2 minutes, and hot set at 180°C for 1 minute.

[0088] Example 2 Made of PTFE fiber ("Toyoflon" (registered trademark)) of 440dtex total fiber and 60 filaments per yarn, dry heat shrinkage of 9% when heated for 30 minutes at 230°C) Synthesis yarns were obtained by ligating with alignment aramid fibers ("Kevlar" (registered trademark) Toray-DuPont (share)) with a total fiber of 440dtex and a single yarn number of 267 filaments at 167t / m. The warp and weft on side 1 use the aforementioned joint yarn, and on the warp and weft on side 2, double-layer plain fabric is made with a total fiber of 3300dtex and a single yarn number of 1333 filaments ("Kevlar" (registered trademark)). In warp yarns are not implemented to improve weaving properties of pulping, etc. Refining was then carried out in a refinement tank at 80°C for 20 min and dried at 130°C for 2 min.

[0089] Example 3 In addition to being the weft yarn of the first side, a double-layer plain fabric was prepared in the same way as in Example 2, using a counter-aramid fiber (made by "Kevlar" (registered trademark) Toray-DuPont (shares)) with a total fineness of 3300 dtex and a single yarn number of 1330 filaments, in the same way as in Example 2, which was then dried in a refinement tank at 80°C for 20 min for 130 min.

[0090] Compare Example 2 PTFE fiber ("Toyoflon" (registered trademark) made by Toray (shares), 9% dry heat shrinkage when heated for 30 minutes at 230°C) with a total fiber of 880dtex and a single yarn number of 144 filaments was combined with a liquid crystal polyester fiber ("Siveras") with a total fiber of 850dtex and a single yarn number of 144 (note Registered trademark) Toray (shared) made by Toray (stock) at 167t / m. After obtaining the joint yarn, the aforementioned joint yarn was used in the warp yarn and liquid crystal polyester fiber ("Siveras" (registered trademark) made of Toray (share)) with a total fiber length of 1700dtex and a single yarn number of 288 filaments was used in the weft. In warp yarns are not implemented to improve weaving properties of pulping, etc. Refining was then carried out in a refinement tank at 80°C for 20 min, dried at 130°C for 2 min, and hot set at 180°C for 1 min.

[0091] Compare Example 3 PTFE fiber with a total fiber of 440dtex and a single yarn count of 60 filaments (made by Toyoflon (shared), with a dry heat shrinkage rate of 9% when heated for 30 minutes at 230°C and a total fiber of 425dtex, Liquid crystal polyester fiber ("Siveras" (registered trademark) made by Toray (Stock)) with a single yarn number of 72 filaments was kneaded at 167t / m and obtained the yarn yarn, the aforementioned yarn yarn was used for warp and weft yarns to make a single layer flat fabric with a loom. In warp yarns are not implemented to improve weaving properties of pulping, etc. Refining was then carried out in a refinement tank at 80°C for 20 min, dried at 130°C for 2 min, and hot set at 180°C for 1 min.

[0092] Comparative Example 4 A single-layer plain weave was made by alternating 2 strands of PTFE fiber ("Toyoflon", a registered trademark, manufactured by Toray Industries, Inc., with a dry heat shrinkage rate of 9% when heated at 230°C for 30 minutes) with a fineness of 440 dtex and a single yarn count of 60 filaments in the warp yarns and liquid crystal polyester fiber ("Siveras", a registered trademark, manufactured by Toray Industries, Inc., with a fineness of 1700 dtex and a single yarn count of 288 filaments in the weft yarns and alternating 2 strands of PTFE fiber ("Toyoflon", a registered trademark, manufactured by Toray Industries, Inc., with a dry heat shrinkage rate of 9% when heated at 230°C for 30 minutes) with a fineness of 2660 dtex and a single yarn count of 360 filaments in the weft yarns and liquid crystal polyester fiber ("Siveras", a registered trademark, manufactured by Toray Industries, Inc., with a fineness of 425 dtex and a single yarn count of 72 filaments in the weft yarns and alternating 2 strands of the weft yarns and the weft yarns. Sizing, etc., to improve weaveability are not applied to the warp yarns. Then, scouring is carried out in a scouring bath at 80°C, drying is performed at 130°C for 2 minutes, and heat setting is performed at 200°C for 1 minute.

[0093] Comparative Example 5 A single-layer plain weave is produced by alternating 2:2 warp yarns of PTFE fiber (manufactured by Toyoflon, a registered trademark, with a dry heat shrinkage rate of 9% when heated at 230°C for 30 minutes) and para-aramid fiber (manufactured by Kevlar, a registered trademark, with a yarn count of 1000) with a yarn count of 1670 dtex. The weft yarns are alternating 2:2 warp yarns of PTFE fiber (manufactured by Toyoflon, a registered trademark, with a yarn count of 360) and para-aramid fiber (manufactured by Kevlar, a registered trademark, with a yarn count of 267) with a yarn count of 440 dtex. Sizing, etc., to improve weaveability are not applied to the warp yarns. Then, scouring is carried out in a scouring bath at 80°C, drying is performed at 130°C for 2 minutes, and heat setting is performed at 200°C for 1 minute.

[0094] Example 4 The fabric described in Example 1 was heat-set at 120°C for 1 minute.

[0095] Example 5 The fabric described in Example 1 was heat-set at 140°C for 1 minute.

[0096] Example 6 The fabric described in Example 1 was heat-set at 160°C for 1 minute.

[0097] Example 7 The fabric described in Example 1 was heat-set at 180°C for 1 minute.

[0098] Example 8 The fabric described in Example 1 is refined for 1 minute in a refinement tank at 80°C.

[0099] Example 9 The fabric described in Example 1 is refined for 20 minutes in a refinement tank at 80°C.

[0100] Example 10 The fabric described in Example 1 is refined for 20 minutes in a refinement tank at 60°C.

[0101] Example 11 In addition to being used as a fluororesin fiber, PTFE fiber ("Toyoflon" (registered trademark) made by Toyoflon (share) with a total fiber fiber of 1330dtex and a single yarn count of 180 filaments is used when heated at 230°C for 30 minutes other than a dry heat shrinkage rate of 4%), a single layer flat fabric was prepared in the same manner as in Example 1 and then refined in a refinement tank at 80°C for 20 min.

[0102] For the fabrics described in Examples 1 to 3, Examples 11 and Comparative Examples 1, the evaluation results for the composition of the joint yarn, the fabric configuration, the bump height, the thickness reduction speed, the coefficient of kinetic friction, the sedimentation, and the sliding endurance distance are aggregated in Table 1 .

[0103] For the fabrics described in Comparative Examples 2 to 5, the evaluation results of the composition of the yarn, the fabric composition, the speed of thickness reduction, the coefficient of kinetic friction, the bonding, and the sliding endurance distance are summarized in Table 2 . For the fabrics described in Examples 1, Comparative Examples 1, and Examples 4 to 10, the evaluation results for the composition of the yarn, fabric composition, treatment content, and bump height are aggregated in Table 3 .

[0104] [Table 1] Example 1 Compare Example 1 Example 2 Example 3 Example 11 The composition of synthetic yarn Fluoresin fibers                    —— PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 440dtex PTFE fiber 440dtex PTFE fiber 1330dtex Opposite aramid fibers Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 440dtex Opposite aramid fibers 440dtex Opposite aramid fibers 880dtex The mass ratio of the fluororesin fibers occupied in the yarn Quality 60 60 50 50 60 Cloth composition Weaving organization                    —— Single layer plain weave Single layer plain weave Double layer plain weave Double layer plain weave Single layer plain weave Use yarn Sutra yarn Side 1                    —— Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Side 2 Opposite aramid fibers 3300T Opposite aramid fibers 3300T Weft yarn Side 1 Hey fucking yarn Hey fucking yarn Hey fucking yarn Opposite aramid fibers 3300T Hey fucking yarn Side 2 Opposite aramid fibers 3300T Opposite aramid fibers 3300T Weave density Sutra yarn Side 1 strip / 2.54cm 31 31 19 19 31 Page 2 19 19 weft yarn Page 1 27 28 17 17 28 Page 2 17 17 Coverage factor Page 1 dtex 0.5 • Strip / 2.54cm 2505 2548 958 1482 2548 Page 2 2068 2068 CF1 / CF2 - - - 0.46 0.72 - The percentage of fluoropolymer fibers in the total fabric mass quality% 60 60 11 4 60 thickness mm 0.6 0.7 1.0 1.3 0.7 characteristic Concave and convex height μm 409 1192 851 654 990 Thickness reduction rate μm 74 141 198 116 101 Coefficient of Dynamic Friction                    —— 0.066 0.081 0.068 0.064 0.070 Continuity N / mm 2 1.4 0.8 1.0 1.0 1.0 Sliding endurance distance m >150 >150 >150 >150 >150

[0105] [Table 2] Compare Example 2 Compare Example 3 Compare Example 4 Compare Example 5 The composition of synthetic yarn                    —— PTFE fiber 880dtex PTFE fiber 440dtex                    ——                    —— Liquid crystal polyester fiber 850dtex Liquid crystal polyester fiber 425dtex                    ——                    —— Cloth composition Weaving organization                    —— 3 / 1 twill weave Single layer plain weave Single layer plain weave Single layer plain weave Use yarn Sutra yarn                    —— Hey fucking yarn Hey fucking yarn Alternately configure strips 1 and 22 PTFE fiber 440dtex Liquid crystal polyester fiber 1700dtex Alternately configure strips 1 and 22 PTFE fiber 440dtex Parallel aramid fibers 1670dtex Weft yarn Liquid crystal polyester fiber 1700dtex Hey fucking yarn Alternately configure strips 1 and 22 PTFE fiber 2660dtex Liquid crystal polyester fiber 425dtex Alternately configure strips 1 and 22 PTFE fiber 2660dtex Parallel aramid fibers 440dtex Weave density Sutra yarn Strip / 2.54cm 54 45 38 38 Weft yarn Strip / 2.54cm 32 47 36 36 thickness mm 1.00 0.46 0.49 0.49 characteristics Thickness reduction speed μm 292 298                    ——                    —— Coefficient of Dynamic Friction                    —— 0.087 0.088 0.073 0.091 Sliding endurance distance m 150 52 29 19

[0106] [Table 3] Example 1 Compare Example 1 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 The composition of synthetic yarn Fluoresin fibers PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex PTFE fiber 1330dtex Opposite aramid fibers Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex Opposite aramid fibers 880dtex occupied by the folded silk of fluororesin fibers Mass ratios mass % 60% 60% 60% 60% 60% 60% 60% 60% 60% Cloth composition Weaving organization                    —— Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Single layer plain weave Use yarn Sutra yarn                    —— Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Weft yarn                    —— Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Hey fucking yarn Weave density Sutra yarn Strip / 2.54cm 31 31 31 31 31 31 31 31 31 weft yarn strip / 2.54cm 27 28 28 28 28 28 28 28 28 The proportion of the entire fabric Fluoropolymer fiber quality ratio quality% 60 60 60 60 60 60 60 60 60 thickness mm 0.6 0.7 0.6 0.6 0.7 0.7 0.7 0.7 0.7 deal with Dry heat treatment temperature ℃ No action taken 180 120 140 160 180 No action taken No action taken No action taken time minute No action taken 1 1 1 1 1 No action taken No action taken No action taken Humid heat treatment temperature ℃ No action taken 80 No action taken No action taken No action taken No action taken 80 80 60 time minute No action taken 20 No action taken No action taken No action taken No action taken 1 20 20 characteristic Concave and convex height μm 409 1192 417 615 877 896 784 973 895 [Simplified Explanation of the Diagram]

[0023] None.

Claims

1. A sliding material which is a sliding material comprising a fabric followed by a substrate, which is a joint yarn containing fluororesin fiber and para-aramid fiber in at least one of the warp and weft yarn, in at least one side of the joint yarn exposed, the bump height obtained by the following assay is 1150 μm or less, the sliding material is treated as at least 15 μm below the sliding surface of the sliding yarn; The method of determining the height of the bump: The sample was placed on a flat stage to remove unnatural wrinkles and tension, observed under 3D linkage of a digital microscope (“VHX-7000” by KEYENCE), and an area of ​​25mm × 25mm was photographed; When the yarn is exposed on only one side of the sample, set with that side facing up. ・Observe the sample; 2. Such as the sliding material of claim 1, wherein the thickness of the fabric is 1.3mm or less.

3. If the sliding material of claim 1, wherein the yarn is contained in the warp and weft yarns of the fabric.

4. If the sliding material of claim 2, wherein the yarn is contained in the warp and weft yarns of the fabric.

5. If the sliding material of any one of claims 1 to 4, wherein the fabric is a multilayer fabric comprising the outermost 1st face and the outermost 2nd face on the opposite side of the 1st face, the joint yarn is included in at least one of the warp and weft yarns of the first face.

6. Such as the sliding material of claim 5, wherein the ratio (CF1 / CF2) of the coverage factor (CF1) of the 1st face to the coverage factor of the 2nd face (CF2) is less than 1.

7. The sliding material of any one of claims 1 to 4, wherein the mass ratio of fluororesin fibers in the entirety of the fabric is less than 20% by mass.

8. As in the sliding material of claim 5, wherein the mass ratio of fluororesin fibers occupied in the entirety of the fabric is less than 20% by mass.