JP2019189993A - Fluorine resin-based fiber and manufacturing method therefor - Google Patents

Abstract

To provide a fluorine resin-based fiber hardly generating entanglement even in knitted fabric processing, less in yarn cast-off during knitted fabric processing, and capable of being processed to a high quality knitted fabric.SOLUTION: The fluorine resin-based fiber for knitted fabric processing has fiber-fiber dynamic friction coefficient of 0.25 or less and fiber-metal dynamic friction coefficient of 0.30 to 0.90. The fluorine resin-based fiber for knitted fabric processing preferably had an oil agent containing 0.1 to 0.5 wt.% of a polyoxyethylene compound of 10 wt.% or more adhered. Further the fluorine resin-based fiber for knitted fabric processing preferably has total fineness of 200 to 1,000 dtex, single fiber fineness of 1 dtex to 20 dtex, strength of 1.0 to 3.0 cN/dtex, and elongation of 10 to 30%.SELECTED DRAWING: None

Description

  The present invention relates to a fluororesin fiber excellent in woven and knitted fabric processing and a method for producing the same.

  Fluororesin fibers represented by polytetrafluoroethylene (hereinafter sometimes referred to as PTFE) fibers have excellent heat resistance, chemical resistance, or low friction coefficient and excellent slidability. Widely used in industrial material applications. In particular, in terms of having a low coefficient of friction, it is widely used as a sliding member in the form of woven or knitted fabric or non-woven fabric, such as OA equipment members such as automobile members and copying machines.

  Among the fluororesin fibers, PTFE fibers are known as the most excellent fibers in heat resistance, chemical resistance and slidability. However, because of these characteristics, it is difficult to make a fiber by a normal melt spinning method or wet spinning, and as a production method thereof, a matrix spinning method in which spinning is performed using a matrix substance and then a firing process is performed (Patent Documents 1 and 2). ), Split peeling method (Patent Document 3), and paste extrusion method (Patent Document 4). Among these, the PTFE fiber obtained by the matrix spinning method is characterized by having a uniform fiber cross section and small variation in fineness, and therefore can be said to be a PTFE fiber excellent in knitting and knitting processing.

  However, since the fluororesin fiber produced by the production method has extremely low frictional resistance, when unwinding the multifilament from the bobbin, the single fiber is scattered and entangled by a slight external force. If this entanglement occurs during the processing of the woven or knitted fabric, it leads to a defect of the woven or knitted fabric. In addition, the unfolded multifilament needs to be gripped and used for weaving and knitting to use it for wefts, etc. Similarly, it leads to the drawbacks of woven and knitted fabrics. Therefore, in manufacturing a sliding material that requires a dense and uniform surface, there is a demand for fluororesin-based fibers that are less likely to be tangled and that are less likely to come off during woven and knitting processing from the viewpoint of yield and quality. Yes.

JP 2002-282627 A JP-A-63-219615 JP 51-88727 A JP 2002-301321 A

  Accordingly, an object of the present invention is to provide a fluororesin-based fiber that can be processed into a high-quality woven or knitted fabric that eliminates the above-described problems, is less likely to be entangled, and has less thread loss during woven or knitted fabric processing, and a method for producing the same. It is to provide.

  The present invention solves the above problems, and the fluororesin fiber of the present invention has a fiber-fiber dynamic friction coefficient of 0.25 or less and a fiber-metal dynamic friction coefficient of 0.30 or more and 0.90 or less. It is a fluorine resin fiber for processing some woven and knitted fabrics.

  According to a preferred aspect of the fluororesin-based fiber for processing a knitted or knitted fabric of the present invention, a fluororesin for processing a woven or knitted fabric to which 0.1 to 0.5 wt% of an oil containing 10 wt% or more of a polyoxyethylene compound is adhered. Fiber.

  According to a more preferable aspect, the total fineness is 200 to 1,000 dtex, the single fiber fineness is 1 to 20 dtex, the strength is 1.0 to 3.0 cN / dtex, and the elongation is 10 to 30%. Fluororesin fiber.

  In addition, the method for producing a fluororesin fiber excellent in woven or knitted fabric use according to the present invention comprises mixing a water dispersion of a polytetrafluoroethylene resin and a matrix material, and using a spinneret with this mixed solution by a wet spinning method. Fluorine resin fiber for knitting and knitting processing, characterized in that the above-mentioned oil agent is adhered to 0.1 to 0.5 wt% after spinning, firing the matrix material in the firing step and opening the fiber. It is a manufacturing method.

  By using the fluororesin fiber of the present invention that is less tangled and excellent in knitting and knitting, a high-quality woven or knitted fabric with few defects can be obtained.

  The details of the fluororesin fiber for knitting and knitting processing of the present invention and the production method thereof will be described below.

  The fluororesin fiber for knitting and knitting processing of the present invention has a fiber-fiber dynamic friction coefficient of 0.25 or less, preferably 0.23 or less. The fiber-metal dynamic friction coefficient (rubbed object: 9 mmφ nickel chrome rod (mirror surface)) is 0.30 or more and 0.90 or less, preferably 0.30 or more and 0.80 or less. When the fiber-fiber dynamic coefficient of friction exceeds 0.25, the single filaments are easily handled by a slight external force when the multifilament is unwound, and tangles are likely to occur. If this entanglement occurs during the processing of the woven or knitted fabric, it leads to a defect of the woven or knitted fabric, which is not preferable. Further, when the fiber-metal dynamic friction coefficient is less than 0.30, yarn dropout is likely to occur during knitting and knitting processing. On the other hand, if it exceeds 0.90, resistance in the process guide in knitting and knitting processing is increased, and high-order passability is deteriorated. The fiber-fiber dynamic friction coefficient and the fiber-metal dynamic friction coefficient in the present invention are values measured in accordance with the measurement of 9.11 friction coefficient in JIS L1095: 2010 “General spinning yarn test method”. The object to be rubbed is a 9 mmφ nickel chrome rod (mirror surface).

  The fluororesin-based fiber for processing a knitted or knitted fabric of the present invention preferably has 0.1 to 0.5 wt% of an oil containing 10 wt% or more of a polyoxyethylene compound attached, more preferably 0.1 -0.4 wt%. As a result of intensive studies on the dynamic friction coefficient of fluororesin fibers for knitting and knitting processing, 0.1 to 0.5 wt% of the polyoxyethylene compound adheres, so that the fiber-fiber dynamic friction coefficient decreases and the fiber-metal dynamic friction We found that the coefficient increases. When the polyoxyethylene-based compound adhesion rate is 0.1 to 0.5 wt%, the converging property of single fibers increases, and the occurrence of tangles can be suppressed without being handled by a slight external force. Moreover, if it is this range, the high-order passage property by oil agent omission at the time of woven / knitting processing will not deteriorate. Further, the concentration of the polyoxyethylene compound in the oil is preferably 10 to 30 wt%, and this concentration makes it easy to control the amount of oil attached to the fiber. Specific examples of the polyoxyethylene compound include polyoxyethylene alkyl ether, polyoxyethylene alkylamino ether, and polyoxyethylene alkylphenyl ether, but it is not necessary to limit them. The number average molecular weight of the polyoxyethylene compound is not particularly limited, but the number average molecular weight is preferably in the range of 100 to 2000 from the viewpoint of easy control of the amount of oil agent attached to the fiber. Moreover, there is no problem even if the oil contains a component other than the polyoxyethylene compound. The solvent of the oil agent is not particularly limited, but water that allows easy adjustment of the oil agent concentration is preferable. In addition, an oil agent adhesion rate and a polyoxyethylene-type compound adhesion rate say the weight of the adhered oil agent and a polyoxyethylene type compound with respect to the weight of the whole fiber.

  The fluororesin fiber for knitting and knitting processing of the present invention has a total fineness of 200 to 1,000 dtex, a single fiber fineness of 1 to 20 dtex, a strength of 1.0 to 3.0 cN / dtex, and an elongation of 10 to 30%. And it is preferable that it is the fluororesin type fiber for knitting and knitting processing which 0.1 to 0.5 wt% of oil agent adhered.

  As described above, the total fineness of the fluororesin-based fiber for processing a woven or knitted fabric of the present invention is preferably 200 to 1,000 dtex, and the total fineness is more preferably 400 to 900 dtex.

  If the total fineness is 200 to 1,000 dtex, it becomes possible to process into a woven or knitted fabric excellent in flexibility and mechanical strength.

  Moreover, it is preferable that the single fiber fineness of the fiber which comprises the fluororesin type fiber for textile fabric processing of this invention is 1-20 dtex, More preferably, it is 3-15 dtex. If the single fiber fineness is 1 to 20 dtex, it can be produced without any problem in the matrix spinning method and has a strength suitable for knitting and knitting.

  The fluororesin-based fiber for processing a knitted or knitted fabric of the present invention preferably has a strength of 1 to 3 cN / dtex, more preferably 1 to 2 cN / dtex. Further, the elongation of the fluororesin fiber for knitting and knitting is preferably 10 to 30%, and more preferably 12 to 28%.

  If the strength is 1 to 3 cN / dtex, yarn breakage during knitting or knitting processing and tearing of the knitting or knitting when used as a sliding material can be prevented, and it can be produced by a normal matrix spinning method.

  In addition, the tangle is a characteristic representing the quality of the fiber and represents a state in which the single fiber is not cut but is entangled with other single fibers. Since entanglement becomes a defect of the woven or knitted fabric and affects the characteristics of the sliding material, it is a preferable aspect to reduce it when used for woven or knitted fabric processing.

  Next, the manufacturing method of the fluororesin type fiber for woven / knitted fabric processing in the present invention will be described.

  In the present invention, the material of the fluororesin fiber may be a tetrafluoroethylene homopolymer (PTFE) or a copolymer in which 90 mol% or more, preferably 95 mol% or more of the whole is tetrafluoroethylene. In view of characteristics, the content of tetrafluoroethylene units is preferably large, and more preferably a homopolymer. Examples of the monomer copolymerizable with tetrafluoroethylene include vinyl fluoride compounds such as trifluoroethylene, trifluorochloroethylene, tetrafluoropropylene, hexafluoropropylene, and further propylene, ethylene, isobutylene, styrene, acrylonitrile, and the like. Examples of the vinyl compound include, but need not be limited to these.

  In the present invention, the number average molecular weight of the fluororesin constituting the fluororesin fiber for knitting and knitting is preferably 3 million or more and 8 million or less. If the number average molecular weight is 3 million or less, the intended strength may not be obtained. In addition, since the frequency of occurrence of polymer agglomerated foreign substances increases when it is 8 million or more, it may be difficult to produce a fluororesin fiber having the desired strength stably and over the long term.

  The fluororesin-based fiber for processing a knitted or knitted fabric of the present invention is preferably produced by a matrix spinning method. The matrix spinning method is a manufacturing method in which viscose or the like is used as a matrix, and a mixed solution of a matrix and an aqueous dispersion of a fluororesin is discharged into a coagulation bath to be fiberized, and then scoured and then fired. By firing at a melting point or higher of the fluororesin, the subsequent stretchability is imparted only by melting the fluororesin while fusing most of the matrix polymer and fusing the particles. After the above firing, the obtained undrawn yarn is drawn directly in one step or two steps. Moreover, the fluororesin-type fiber obtained by this manufacturing method can obtain a fiber with uniform physical properties.

  In the method for producing a fluororesin fiber for processing a woven or knitted fabric of the present invention, first, a water dispersion of a fluororesin, preferably a polytetrafluoroethylene resin, and a matrix material such as viscose are mixed by a known method. Then, the mixed solution is used for spinning by a wet spinning method using a spinneret having a plurality of discharge ports.

  Next, the matrix material is burned off in the firing step. In the firing, a contact type firing roller or a non-contact type firing heater can be used, but a contact type firing roller is preferably used. Baking is performed at a temperature of 150 ° C. or higher and 380 ° C. or lower while giving a relaxation of 1 to 5% between the baking rollers. When the firing temperature is lower than 150 ° C., the fluororesin particles in the fiber are not sufficiently fused, and yarn breakage frequently occurs during stretching after firing, resulting in low fiber strength. On the other hand, when the firing temperature exceeds 380 ° C., the fiber cross-sectional shape is deformed, a uniform cross-sectional shape cannot be obtained, fusion between single fibers occurs, and the oil agent does not uniformly adhere to the entire fiber in the subsequent oil agent application. Adversely affects the knitting and knitting process. Furthermore, since the fluororesin is thermally decomposed, yarn breakage frequently occurs during stretching after firing, and the strength is lowered. Each roller temperature at the time of baking may be changed independently. Moreover, if it is in the said range, it can set without limitation.

  Subsequently, it is preferable to heat-stretch at the temperature of 300 degreeC or more and 380 degrees C or less, More preferably, extending | stretching temperature is 310 degreeC or more and 370 degrees C or less. If the drawing temperature is less than 300 ° C., the drawing breaks frequently occur and the number of single yarn breaks increases, which is not preferable. Single yarn breakage represents a state in which one or several single fibers are cut and entangled in a specific portion, and is not preferable because it becomes a defect of a woven or knitted fabric as in the case of entanglement. Moreover, when extending | stretching temperature exceeds 380 degreeC, a fluororesin decomposes | disassembles and it may lead to a strength fall.

  The draw ratio is preferably 5 to 9 times, more preferably 6 to 8 times. If the draw ratio greatly affects the strength and the elongation, and the draw ratio is less than 5 times, sufficient strength cannot be obtained. On the other hand, when the draw ratio exceeds 9 times, the drawing breakage and the single yarn breakage occur frequently. As the stretching means, there are a method of stretching with a hot pin and a method of stretching through a salt bath, and hot pin stretching is preferably used from the viewpoint of safety.

  After stretching, an oil containing 10 wt% or more of a polyoxyethylene compound is applied to the fiber in an amount of 0.1 to 0.5 wt% and wound with a winder.

  The method for applying an oil agent containing 10 wt% or more of a polyoxyethylene compound is not particularly limited, but the application rate of an oil agent containing 10 wt% or more of a polyoxyethylene compound is preferably provided by kiss roll. The rotational speed of the kiss roll is adjusted so as to be 0.1 to 0.5 wt%. More preferably, the oil agent is applied after the fibers are opened. By opening the fibers, the oil agent adheres evenly between the single fibers, so that the single fibers are less likely to be demarcated and the occurrence of tangles can be suppressed. Although it does not specifically limit as the method of opening, Although the opening apparatus which applies an airflow to a fiber is used preferably.

  In this way, it is possible to obtain a fluororesin fiber that is suitable for knitting and knitting processing, is less likely to be entangled, and has less thread loss during knitting and knitting processing.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples. The physical properties were measured and evaluated by the following methods.

(1) Fluorine the resin molecular weight fibers the fluorine resin constituting the obtains the crystal heating .DELTA.Hc (cal / g) using a differential scanning calorimeter DSC, formula number average molecular weight = 2.1 × ^{10 10} ΔHc ^-5.16
It calculated in.

(2) Total fineness Fineness measurement method B (simple method) of JIS L1013: 2010 “Testing method for chemical fiber filament yarn” was applied.

(3) Single fiber fineness Calculated by dividing the total fineness measured in (2) above by the number of filaments.

(4) Strength and elongation Measured according to the standard time test of JIS L1013: 2010 “Testing method for chemical fiber filament yarn”.

(5) Oil agent adhesion rate 10 g of fibers were immersed in 50 ml of methanol and refluxed for 15 minutes to extract the oil into methanol. The oil adhesion rate was determined by evaporating the methanol after the oil extraction and determining the weight of the adhered oil relative to the weight of the entire fiber from the weight of the non-volatile content.

(6) Dynamic friction coefficient It measured according to 9.11 friction coefficient measurement of JIS L1095: 2010 "General spinning yarn test method". In addition, Eikoku Sangyo Co., Ltd. friction coefficient testing apparatus ME-P01 was used as a testing machine, and the speed was 60 m / min. For 10 seconds. Further, a 9 mmφ nickel chrome rod (mirror surface) was used as the object to be rubbed when the fiber-metal dynamic friction coefficient was measured.

(7) Tangle of fibers and single yarn breakage The multifilament wound on a bobbin with a length of 1000 m or more is unwound under the conditions of a yarn speed of 250 m / min and a tension of 24 g, and the yarn path is regulated by a guide. Measurement was carried out for 4 minutes using a fluff counting device DT-105 (S) (detection accuracy: 1 mm) manufactured by Engineering Co., Ltd. In addition, as for the tangle of the fiber to measure and the number of single yarn breakage, the number of entanglements of the single fiber having a length of 1 mm or more is measured.

(8) Evaluation method of textile quality PTFE fiber (polyoxyethylene alkyl ether adhesion rate 0.3 wt%) having a total fineness of 440 dtex (single fiber fineness 7.4 dtex, 60 filaments) and total fineness 220 dtex in a rapier loom PPS fibers (single fiber fineness 4.4 dtex, 50 filaments), fluororesin fibers produced in this example and comparative example for wefts and PPS fibers with total fineness 220 dtex (single fiber fineness 4.4 dtex, filament number 50) A double weave with a weaving density of 115 / inch (115 / 2.54 cm), weft: 126 / inch (126 / 2.54 cm), a width of 172 cm and a length of 10 m Then, the number of defects (the number of tangles having a length of 1 mm or more and the number of single yarn breaks) of the fluororesin fiber used for the weft was evaluated by inspection. Judgment criteria are as follows.
○: Less than 2 defects of fluororesin fiber used for weft per 10 m of fabric length Δ: 2 to less than 5 defects of fluororesin fiber used for weft per 10 m of fabric length ×: Fabric length Number of defects of fluororesin fiber used for wefts per 10m is 5 or more.

[Example 1]
Viscose is used as a matrix, viscose and an aqueous dispersion of PTFE resin having a number average molecular weight of 6 million are mixed at a weight ratio of 50 wt% / 50 wt%, and this mixture is used for spinning by a spinneret. After the yarn was produced, it was fired at a temperature of 270 to 360 ° C. while giving 5% relaxation in the firing step. Once wound up, after stretching and opening under conditions of a magnification of 7 times and a temperature of 360 ° C., a mixed oil agent of polyoxyethylene alkyl ether (number average molecular weight 300) and polyoxyalkylene alkyl ether (number average molecular weight 500) ( A mixture ratio of 60 wt% / 40 wt%, an oil agent concentration of 20 wt%, and water as a solvent is used to attach the oil agent so that the oil agent adhesion rate is 0.3 wt% with kiss roll, and the number average molecular weight is 6 million, single fiber PTFE fiber having a fineness of 7.5 dtex (445 dtex-60 filament) was obtained. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.23, and the fiber-metal dynamic friction coefficient was 0.75. The strength was 1.4 cN / dtex, and the elongation was 24%.

  As a result of measuring the number of tangles and single yarn breakage of this PTFE fiber, the number of tangles and single yarn breakage detected was zero.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 1, and the evaluation of the textile quality was ○. The results are shown in Table 1.

[Example 2]
Oil agent using polyoxyethylene alkyl ether and polyoxyalkylene alkyl ether mixed oil agent (mixing ratio 50 wt% / 50 wt%, oil agent concentration 20 wt%, using water as solvent) so that the oil agent adhesion rate is 0.5 wt% A PTFE fiber was obtained in the same manner as in Example 1 except that. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.23, and the fiber-metal dynamic friction coefficient was 0.84. The strength was 1.4 cN / dtex and the elongation was 27%.

  As a result of measuring the number of tangles and single yarn breakage of this PTFE fiber, the number of tangles and single yarn breakage detected was zero.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 0, and the evaluation of the textile quality was ○. The results are shown in Table 1.

[Example 3]
Using a mixed oil agent of polyoxyethylene alkyl ether and polyethylene glycol (mixing ratio 10 wt% / 90 wt%, oil agent concentration 20 wt%, using water as a solvent), the oil agent is adhered so that the oil agent adhesion rate is 0.1 wt%. Except that, PTFE fiber was obtained in the same manner as in Example 1. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.25, and the fiber-metal dynamic friction coefficient was 0.50. The strength was 1.4 cN / dtex, and the elongation was 24%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was one.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 1, and the evaluation of the textile quality was ○. The results are shown in Table 1.

[Example 4]
Except that it was fired at a temperature of 250 to 360 ° C. while giving a relaxation of 3% in the baking step, wound up, and then stretched under the conditions of 9 times magnification and 320 ° C. PTFE fiber was obtained. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.24, and the fiber-metal dynamic friction coefficient was 0.80. The strength was 1.7 cN / dtex and the elongation was 13%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was one.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 2, and the evaluation of the textile quality was Δ. The results are shown in Table 1.

[Example 5]
PTFE fiber was obtained in the same manner as in Example 1 except that the fiber opening treatment was not performed. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.24, and the fiber-metal dynamic friction coefficient was 0.73. The strength was 1.4 cN / dtex, and the elongation was 24%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was four.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 3, and the evaluation of the textile quality was Δ. The results are shown in Table 1.

[Comparative Example 1]
PTFE fiber was obtained in the same manner as in Example 1 except that the oil was not attached. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.29, and the fiber-metal dynamic friction coefficient was 0.26. The strength was 1.3 cN / dtex, and the elongation was 25%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was nine.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 10, and the evaluation of the textile quality was x. The results are shown in Table 1.

[Comparative Example 2]
Using a mixed oil agent of polyoxyethylene alkyl ether and polyethylene glycol (mixing ratio 5 wt% / 95 wt%, oil agent concentration 20 wt%, using water as a solvent), the oil agent is adhered so that the oil agent adhesion rate is 0.4 wt%. Except that, PTFE fiber was obtained in the same manner as in Example 1. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.27, and the fiber-metal dynamic friction coefficient was 0.78. The strength was 1.1 cN / dtex and the elongation was 27%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was six.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 8, and the evaluation of the textile quality was x. The results are shown in Table 1.

[Comparative Example 3]
PTFE fiber was obtained in the same manner as in Example 1 except that the film was stretched under the conditions of a magnification of 4 times and a temperature of 385 ° C., and no oil agent was attached. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.30, and the fiber-metal dynamic friction coefficient was 0.28. The strength was 0.8 cN / dtex and the elongation was 38%.

  As a result of measuring the number of tangles and single yarn breaks of this PTFE fiber, the number of tangles and single yarn breaks detected was 43.

  As a result of evaluating the textile quality using this PTFE fiber, the number of defects was 37, and the evaluation of the textile quality was x. The results are shown in Table 1.

[Comparative Example 4]
PTFE fibers were obtained in the same manner as in Example 1 except that the oil agent was attached so that the oil agent adhesion rate was 1.0 wt% with kiss roll. As a result of measuring the dynamic friction coefficient of the fiber, the fiber-fiber dynamic friction coefficient was 0.22, and the fiber-metal dynamic friction coefficient was 0.92. The strength was 1.4 cN / dtex, and the elongation was 25%.

  As a result of measuring the number of tangles and single yarn breakage of this PTFE fiber, the number of tangles and single yarn breakage detected was zero.

  As a result of evaluating the quality of the fabric using this PTFE fiber, the resistance in the process guide is increased, and the oil agent is dropped, so that the high-order passability deteriorates immediately and trial weaving. The fabric quality could not be evaluated. The results are shown in Table 1.

Since the fluororesin fiber of the present invention is excellent for woven and knitted fabrics, it can be expected to be developed as a sliding member such as an automobile member or an OA equipment member.

Claims (5)

  A fluororesin fiber for knitting and knitting, which has a fiber-fiber dynamic friction coefficient of 0.25 or less and a fiber-metal dynamic friction coefficient of 0.30 or more and 0.90 or less.   The fluororesin fiber for knitting and knitting processing according to claim 1, wherein 0.1 to 0.5 wt% of an oil containing 10 wt% or more of a polyoxyethylene compound is adhered.   The knitted and knitted fabric processing according to claim 1 or 2, wherein the total fineness is 200 to 1,000 dtex, the single fiber fineness is 1 to 20 dtex, the strength is 1.0 to 3.0 cN / dtex, and the elongation is 10 to 30%. Fluororesin fiber for use.   After mixing an aqueous dispersion of a polytetrafluoroethylene resin and a matrix material, the mixture solution is used to produce a yarn by a wet spinning method using a spinneret, and the matrix material is burned off in a firing step. The method for producing a fluororesin fiber for woven or knitted fabric processing according to any one of claims 1 to 3, by adhering 0.1 to 0.5 wt% of an oil containing 10 wt% or more of an ethylene compound. . The method for producing a fluororesin-based fiber for woven or knitted fabric processing according to claim 4, wherein the fiber is opened before applying the oil agent.