JP4767584B2 - Synthetic fiber production thread regulating member, method for producing the same, and method for producing synthetic fiber - Google Patents

Description

  The present invention relates to a yarn path regulating member for synthetic fiber production, a method for producing the same, and a method for producing synthetic fiber. More specifically, the present invention further improves the low friction and wear resistance of the surface, and greatly increases the fine protrusions on the surface. The present invention relates to a method for producing a synthetic fiber using a yarn path regulating member that has been greatly reduced.

  In general, synthetic fibers are produced by spinning a synthetic polymer from a die and then drawing.

  In particular, in the manufacture of polyamide fibers and polyester fibers, a melted synthetic polymer is melt-spun from a spinneret, and then cooled and solidified to impart convergence, antistatic properties, smoothness, etc. to the spun yarn. An oil agent is attached and then stretched several times in a stretching process to form a high-strength yarn.

For example, in the case of a stretching roller, the stretching ratio given in the stretching process is determined by the rotational speed of the roller, the surface temperature, the surface slipperiness, etc. In order to stabilize the slipperiness, the surface of the stretcher roller is plated with chromium. Or a coating layer by chromium oxide spraying or the like is provided.

  However, with the recent increase in strength, high spinning speed and mass production in the synthetic fiber manufacturing method, there is a strong demand for low friction and wear resistance on the surface of the drawing roller in contact with the yarn. Due to the improvement of production efficiency, the multi-threading equipment has been rapidly advanced. Therefore, the long rollers have become a tributary of the drawing rollers, and there is a great demand for the long rollers. Needless to say, the yarn path regulating member disposed in the process from drawing and winding the yarn has the same requirement.

  As one of the countermeasures, a plating technique such as hard chrome plating or chromium-chromium carbide composite plating (Hv1000 grade) has been proposed and put into practical use (Patent Document 1).

  However, there are few technologies that can meet the requirements of uniform coating formation thickness and surface roughness for long rollers while maintaining high coating formation hardness, and it has not been satisfactory.

  In addition, even if the coating formation thickness and surface roughness of the long roller can be met while maintaining high coating formation hardness, there are still problems such as innumerable micro protrusions on the roller surface. It was not solved and technology development was desired.

  On the other hand, as a thermal spraying technique, a sprayed chromium oxide is also known. However, these conventional coating layers have not been able to exhibit sufficient abrasion resistance with respect to the recent methods for producing synthetic fibers having high strength and high spinning speed, It is not enough to prevent deposition. Further, in an actual production machine stretching process, carbides such as oil that have been deposited on the surface of the stretching roller are removed (washed) at regular intervals.

  The reason for cleaning is that dirt accumulates on the roller surface and the frictional resistance increases with time. In such a state, fluff and single yarn breakage occur, and the yarn breakage is the worst. Therefore, the stretching roller is washed, and at this time, the stretching roller heated to about 200 to 300 ° C. of the production temperature is cooled to about 150 ° C. at once, and this is repeated, There was a problem that the thermal spray coating layer peeled off or dropped off due to shear stress at the interface with the roller base material.

    Further, there has been proposed a technique in which the surface of a drawing roller is plasma spray-coated using a tungsten carbide composite material in which cobalt is combined with tungsten carbide (Patent Document 2).

  However, since the plasma-coated one cannot be blasted, there is a problem that the friction cannot be reduced and the contamination is not sufficiently prevented.

In any of the techniques, a result that can sufficiently satisfy the above-mentioned requirements has not been achieved, and further technical development has been desired.
JP-A-60-2691 JP 2002-212852 A

An object of the present invention is to solve the prior art problems described above, the low friction against synthetic fibers, to improve further the long-term wear resistance, and the surface of the fine protrusions is little yarn path regulating guide, the yarn path regulating Providing a yarn path regulating member for synthetic fiber production such as a guide roller, a tension bar, a stretched entangled air guide, etc. , further providing a method for producing the synthetic fiber producing yarn path regulating member, and further providing the synthetic fiber It is an object of the present invention to provide a method for producing a stable synthetic fiber with a long period of fluff and less yarn breakage , using a production yarn path regulating member .

The synthetic fiber manufacturing yarn path regulating member of the present invention that solves the above problems has the following configuration (1).
(1) A yarn path regulating member formed by coating a chromium plating layer formed by electroplating a chromium compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ) on the surface of a metal base material, the chromium plating layer surface The number of the fine projections having a side of the longest axis of 5 μm or more present in the yarn path is at most one per 1 cm square of the surface within the yarn traveling range of the yarn path regulating member , and JIS-B0601: The surface roughness according to 2001 standard is 0.3-5 μm in arithmetic mean roughness Ra, and the load length ratio (%) and the cutting level (relative load length Rmr defined in JIS-B0601: 2001 standard) %), The triangle total surrounded by a straight line a connecting the coordinate points (0, 0), (100, 100), a line having a load length ratio of 0%, and a line having a cutting level of 50%. The area is A and the Cartesian coordinates are cut. In level 0-50% area, when the total area surrounded by the said line a relative load length curve b is B, the area ratio B / A is characterized by a 10% to 35% Yarn regulating member for synthetic fiber production.

More preferably, the yarn path regulating member for producing a synthetic fiber of the present invention may have any one of the following configurations (2) to (5) in addition to the above configuration.

(2) The yarn path regulating member for synthetic fiber production according to (1), wherein the chromium plating layer has a coating hardness of Hv 950 to 1300 .
(3) The yarn path regulating member for synthetic fiber production according to (1) or (2), wherein a frictional resistance value with the yarn on the surface of the chromium plating layer is 40 to 70 gf .
(4) The yarn path regulating member for synthetic fiber production according to any one of (1) to (3), wherein the chromium plating layer has a thickness of 10 to 200 μm .
(5) The synthetic fiber production according to any one of the above (1) to (4) , wherein a content of the chromium carbide alloy (Cr ₂₃ C ₆ ) is 1 to 8% in the chromium plating layer. Stretch yarn path regulating member.

The manufacturing method of the yarn path regulating member for producing a synthetic fiber according to the present invention that solves the above problems has the following configuration (6).
(6) Yarn path regulating member for synthetic fiber production in which a metal yarn path regulating member is subjected to blasting and polishing, and then electroplated with a chromium compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ). Wherein the electroplating process controls the ripple content of the rectifier to 5% or less and the process is performed at a current density of 20 to 220 A / dm ^2. The manufacturing method of a control member.

The manufacturing method of the synthetic fiber of this invention which solves the said subject has the structure of the following (7) .
(7) The synthetic fiber is drawn using the yarn path regulating member for synthetic fiber production described in any one of (1) to (5 ) above.

According to the present invention, there are provided a yarn path regulating member for producing a synthetic fiber, which has excellent low friction characteristics with respect to a synthetic fiber, has long-term wear resistance, and has few fine protrusions on the surface, and a method for producing the same. can do.

  Further, according to the method for producing a synthetic fiber of the present invention, the low friction property of the yarn / yarn path regulating member and the long-term wear resistance are further improved as compared with the conventional yarn path regulating member, and dirt accumulation is further improved. It is possible to provide a synthetic fiber production method that is stable over a long period of time by using a yarn path regulating member that enables reduction.

The yarn path regulating member for synthetic fiber production of the present invention is a yarn path regulation in which a chromium plating layer obtained by electroplating a chromium compound containing a chromium carbide alloy (Cr23C6) is coated on the base material surface of a metal yarn path regulating member. The chrome plating layer has a cross-sectional shape in which a chrome plating film 10 is formed on the surface of the base material 9 as shown in FIG. 5, and one side of the longest axis existing on the chrome plating layer surface. The number of fine protrusions of 5 μm or more is 1 or less per 1 cm square of the surface of the yarn path regulating member at least within the yarn traveling range.

  The yarn path regulating member referred to here is a yarn path regulating guide 2, a yarn path regulating guide roller 3, a feed roller 4 and stretched entangled air of the yarn 1 as shown in FIG. A yarn path regulating guide roller as shown in FIG. 2 used in a yarn making process including a guide 5, a spinning roller 6 having a drawing roller 6, a drawing and winding machine 7, and a winding device group of a yarn package 8, as shown in FIG. The yarns of the yarn while running in contact with the synthetic fiber yarn, such as the yarn path regulating guide 2 having the shape exemplified in a), (b), and (c), and the drawn entangled air guide 5 as shown in FIG. It is a concept that includes all of the members intended to regulate the road. In addition, the shape of the above-described yarn path regulating member is an example, and is not particularly limited to these shapes.

  Further, the one side of the longest axis here refers to the longest side extending in the biaxial direction of the protrusion obtained in the replica photograph. “Replica photograph” refers to a photograph in which a film softened with acetone is applied and the unevenness is transferred and observed with an optical microscope until the unevenness on the surface of the object is observed. "Means a portion where the surface of the yarn path regulating member and the yarn are in contact with each other.

When the surface roughness of the chromium plating layer formed on the surface of the base material of the yarn path regulating member as described above is displayed by the method defined in JIS-B0601: 2001, the yarn path regulating member of the present invention is arithmetically operated. It is important to set the average roughness Ra to 0.3 to 5 μm. A stylus scanning roughness measuring instrument is used to measure the roughness of the blade.

First, a roughness curve of the chromium plating layer is obtained with a stylus scanning type roughness measuring instrument, and the arithmetic average roughness Ra obtained from the roughness curve is set in the range of 0.3 to 5 μm. The surface roughness of the yarn path regulating member is determined by the single yarn thickness of the fiber yarn to be produced. For example, when a fiber yarn having a small single yarn thickness is drawn, a surface roughness having a large arithmetic average roughness Ra (coarse) is selected and the fiber yarn is drawn. The fiber yarns fall off into the selected textured troughs on the surface of the yarn path regulating member due to the tension, and the fiber yarns are transferred while meandering. Accordingly, the frictional resistance with the yarn on the surface of the yarn path regulating member is increased, which may cause fluff, single yarn breakage, or yarn breakage.

  On the other hand, it is assumed that when a fiber yarn having a small single yarn thickness is drawn, a surface roughness with a small (average) arithmetic average roughness Ra is selected and the fiber yarn is drawn under the same conditions as described above. Since the contact area with the yarn on the surface of the yarn path regulating member is large, the frictional resistance with the yarn on the surface of the yarn path regulating member increases, and if it is stretched more than necessary and exceeds the limit magnification of the fiber yarn, thread breakage may occur. May end up.

  Therefore, it is preferable to determine the surface roughness of the yarn path regulating member according to the single yarn thickness of the fiber yarn to be produced as described above, and obtain a frictional resistance suitable for the fiber yarn.

  Furthermore, the shape of the top of the roughness of the surface of the yarn path regulating member described above is important. In order to specify the apex shape, the surface of the chrome plating layer is cut off flatly by a certain amount, and the surface roughness is obtained with a stylus scanning roughness measuring instrument for each cut-off, and the cutting at that time is performed. The load length ratio (%) of the level (%) and the cumulative relative load length Rmr is obtained, and the measured values obtained in this way are represented by the load length ratio (%) and cutting level ( %) To obtain a relative load length curve b. In the orthogonal coordinates of the load length rate (%) and the cutting level (%), the straight line a connecting the two coordinate points (0, 0) and (100, 100) and the load length rate is 0%. A total triangular area surrounded by a line and a line having a cutting level of 50% is A, and the total area surrounded by the straight line a and the relative load length curve b in the region of the cutting level of 0 to 50% of the orthogonal coordinates Is B, the area ratio B / A is in the range of 10 to 35%. In the above-mentioned surface roughness, the former arithmetic average roughness Ra yarn path regulating member surface roughness is represented. When the arithmetic average roughness Ra is less than 0.3 μm, since the surface is almost smooth with no surface irregularities, the contact area of the yarn with the surface of the yarn path regulating member is increased and the frictional resistance is increased. Fluff and thread breakage increase. Further, when the arithmetic average roughness Ra exceeds 5 μm, the difference in unevenness becomes large, so that fluff and yarn breakage are likely to occur in the fiber yarn. The latter area ratio B / A represents the sharpness of the shape of the protrusion (dull) of the surface roughness of the yarn path regulating member. The cutting level (%) used to obtain the area ratio B / A represents the depth of the surface shape when the cut-off process is performed as described above, and the cut level 0% is the state before the cut-off. The peak of the mountain shape is shown, and a cutting level of 100% indicates the depth of the deepest valley bottom in the roughness curve.

  On the other hand, the load length ratio (%) is obtained as a percentage of the ratio of the sum of the cut lengths (cumulative load length) appearing within the reference length in the plane when cut to each cutting level to the reference length. (It is assumed that 25 mm is selected as the reference length), and is an index representing the shape of the surface of the yarn path regulating member. That is, the smaller the value of the load length ratio (%) means that the surface of the yarn path regulating member is pointed in a jagged mountain shape, and the larger the value is, the larger the roundness of the surface of the yarn path regulating member is. It means that the shape is shown.

  Therefore, the area ratio B / A defined above represents the degree of acute angle of the tip of the dull, and the larger the area ratio B / A, the sharper the tip of the dull and the easier it is to damage the yarn. Means that it is hard to damage the yarn. The area ratio B / A of the surface roughness of the chromium plating layer formed on the yarn path regulating member of the present invention is preferably 10 to 35% as a percentage, and the area ratio B / A is 35. If it exceeds 50%, the surface unevenness dull may be sharpened and the yarn may be damaged. Moreover, in the case of a yarn with a small single yarn fineness, the single yarn may fall into the valley of the dull and the frictional resistance may be increased. On the other hand, when the area ratio B / A is less than 10%, the smoothness of the surface of the yarn path regulating member is sufficient, but the processing technique is not easy.

  In the present invention, as described above, in describing the area ratio B / A as a preferable condition, the range of 0 to 50% of the cutting level is the peak of the surface roughness (dull) in relation to the effect. This is because it is sufficient to measure up to a cutting level of 50% in order to specify the state, and it is not meaningful to measure more than that. In addition, with respect to the above-mentioned area B, in FIG. 6, the relative load length curve b may swell upward from the straight line a. However, it is difficult and difficult to obtain such a case with the current processing technique. Absent.

As described above, the yarn path regulating member of the present invention has at least the yarn running of the yarn path regulating member, which is present on the surface of the chromium plating layer, and has a fine protrusion having a side of the longest axis of 5 μm or more as observed and measured in a replica photograph. 1 cm ² or less per 1 cm ² of the surface within the range, and this observation and measurement method includes a commercially available replica film (for example, acetone cellulose film manufactured by OKEN SHOJI Co., Ltd., thickness of 0.034 mm) of 1 cm. The replica film is soaked in acetone and softened. The softened replica film is adhered to the surface of the yarn path regulating member. Acetone volatilizes at room temperature, and the shape of the surface of the yarn path regulating member is transferred to the replica film and solidified. The replica film is set on a slide and magnified with a microscope (180 to 400 times), and the number of abnormal protrusions generated on the satin surface is measured.

  Here, after blasting the surface of the base material of the metal yarn path regulating member, it is important to further polish the surface of the base material of the yarn path regulating member. The blast treatment is an indispensable treatment in order to bring the above-described chromium plating surface into a roughness range that defines the surface.

  In general, the blasting process uses compressed air (0.2 to 0.5 MPa) and blasting materials (alumina grid, emery (sand), SUS balls, glass beads, etc.) on the surface of the yarn path regulating member. The surface of the yarn path regulating member is roughened by spraying (collision). On the surface of the yarn path regulating member, a dull (mountain / valley shape) having an innumerable random arrangement is formed.

  Since the surface is a sharp edged dull, if the chrome plating process is performed as it is, the chrome plating layer having a large number of fine projections is formed by coating the base. Further, the size of the blast material particles is not strictly constant, and is composed of an aggregate of particles having a specified range. That is, the surface roughness obtained by the blast treatment is not constant, and the particle size variation of the blast material is reflected. In order to avoid the problems described above, it is important to further polish the surface of the base material of the yarn path regulating member after blasting. By this polishing process, abnormal protrusions can be corrected (peak cut) at the base stage, thereby dramatically reducing the occurrence of fine protrusions. A preferable range is polishing about 0.7 to 20% of the height of the dull, and more preferably 0.9 to 1.3%. The abrasive is preferably a fine, soft material such as nonwoven fabric, linen or paper towel. It is preferable to perform the plating process after the fine protrusion suppressing process described above.

Although the above-described method also exerts a great effect on the reduction of fine protrusions on the surface of the yarn path regulating member, it is possible to obtain a surface of the yarn path regulating member with fewer fine protrusions by adopting the following method. A method of manufacturing a yarn path regulating member for coating a chromium plating layer by electroplating in an anhydrous chromic acid solution on a base material surface of a metal yarn path regulating member, which includes a ripple of a rectifier used during the electroplating process controlling the rate to 5% or less, and it is important that the current density is treated with 20~220A / dm ^2.

The chromium plating coating forming method in the electroplating method used in the present invention can be realized by using a special bath (Sargent bath modification). As a bath component, a powder composed of a polymer compound containing chromic anhydride and high-purity carbon (C) is mixed and treated at a bath temperature of about 60 ° C. In order to coat a chromium (Cr) compound including a chromium carbide alloy (Cr23C6), a current density (40 to 220 A / dm ² ) about 2 to 2.5 times that of ordinary chromium plating is required.

The most important chrome plating know-how is to treat with the size of the base material (yarn path regulating member), that is, the surface area (mm ² ) to be plated and the optimal amount of current density (A / dm ² ). is there. For example, when a large current is applied as compared with an appropriate current, the technical term is a flowering phenomenon, and a protrusion such as a crown (crown) is generated at the edge of a koge or pinhole. It mainly refers to the rough and brittle plating process that occurs when the current density exceeds the limit current density. On the other hand, when a small current is applied, poor adhesion (billing) occurs.

It is an indispensable condition that the surface form has the above-mentioned roughness, but the number of fine projections of several to several tens of μm on the surface is 11 per 10 cm square of the surface of the yarn path regulating member at least within the yarn traveling range. It has been found that the occurrence of fluff, single yarn breakage, and the like increases when fine yarns come into contact with the fiber yarns when the yarn yarns run. Therefore, it is important to further polish the surface of the base material of the yarn path regulating member after blasting the surface of the base material of the metal yarn path regulating member. The blast treatment is an indispensable treatment in order to bring the above-described chromium plating surface into a roughness range that defines the surface.

  However, what is important in the plating process is how to select the optimum current density condition according to the surface area of the substrate to be processed and how to suppress the ripple generation rate in the rectifier.

  In general, electroplating is performed by direct current. For that purpose, it is necessary to convert from alternating current to direct current, and the function is performed by a rectifier. This rectifier is roughly classified into a switching type and an inverter type, and the former is a type in which the negative and positive electrodes are respectively picked up (pickup) and switched to direct current by alternately switching alternating current electricity with a semiconductor.

  At this time, in general, noise is generated by alternately switching the alternating current electricity, which is the process described above. Therefore, since a good waveform cannot be obtained, it is generally not used as a rectifier in electroplating. Absent.

  In the latter, AC electricity is changed from AC to DC by an inverter. Therefore, the generation of noise is small, and further, the frequency is amplified, and a large direct current can be generated with power saving. Therefore, it is preferable to select an inverter type for the electroplating rectifier.

  However, even if the latter inverter type rectifier is used, it is impossible to completely remove noise with the current technology. In the first place, when noise is generated, a ripple phenomenon (same as a state where the positive voltage is stopped for several msec) is generated. If the ripple increases, the number of positive power interruptions increases, which naturally causes an abnormality in the current waveform.

  Therefore, if the chrome formation process in the electroplating method is abnormal and there are numerous fine protrusions (several to several tens of μm) such as spark marks on the surface, it can come into contact with the fiber yarn when it travels, causing fluff and thread breakage. It is known that the sex will be greater. Therefore, the ripple (noise) content in the present invention needs to be 5% or less. It was found by repeating the experiment that the positive power pause phenomenon caused by ripples is likely to occur in the region near the upper or lower limit of the electric capacity that can be controlled by the rectifier.

  When the plating process is performed in this unstable region, the occurrence rate of ripples is increased and a plurality of currents exist in the positive current. Therefore, since multiple plating was applied and the satin finish was not uniform, the size of each dull (projection) in the satin was non-uniform, and innumerable fine projections (several to several tens of μm) ) Occurs. Therefore, as a technique for reducing the ripple rate of the rectifier, it is conceivable to incorporate a reactor-capacitor base or use a resistor-capacitor. The former is a generic term for components that act as a resistor during alternating current, and the latter is a generic term for components that are used during direct current. Therefore, the latter was selected to control a large DC current. This is because, when controlling a large current, considering stable power supply, it is considered easier to control after converting to direct current. As a result, the ripple was reduced.

  That is, the above-described technique succeeded in controlling the ripple content, which is an important condition during the plating process, to 5% or less. In addition, in order to check whether the ripple content of the rectifier generated during plating is 5% or less, check the actual value (square root of the root mean square of the instantaneous value), and check that it is an appropriate waveform. is required. As the means for confirmation, there are an execution value display and a peak value display, and an execution value that is easy to check with an oscilloscope (a machine that observes time change of voltage) is used.

  As described above, when the treatment is performed in the environment described above, it is possible to obtain a surface form having no fine protrusions.

  Moreover, the high molecular compound containing high purity carbon (C) used at this time is a carbon compound composed of starch, cellulose, protein, natural rubber, polyethylene, nylon, synthetic rubber, phenol resin, and urea resin. A high-hardness chromium (Cr) compound produced by electroplating with a mixture of chromic anhydride (pH 2 to 4) and a high amount of chromium carbide alloy (Cr23C6). Can be formed.

  The content of the chromium carbide alloy (Cr23C6), which is the chromium (Cr) compound having high hardness, is preferably 1 to 8%. If it is less than 1%, the hardness of the chrome plating layer is low, and the wear resistance of the surface of the yarn path regulating member tends to be inferior. Since it becomes brittle, it is not preferable.

  Next, in the present invention, the chromium plating layer preferably has a coating formation hardness (normal temperature Hv) in the range of 950 to 1300. More preferably, it is the range of Hv1000-1300. If it is less than 1000, for example, when a fiber yarn containing an inorganic additive such as titanium oxide, magnesium oxide, carbon black, and bengara is drawn into the molten polymer, wear significantly occurs. The coating hardness of the chromium plating layer is determined by the amount of chromium carbide alloy (Cr23C6) produced.

  Therefore, in order to set the coating hardness of the chromium plating layer of the yarn path regulating member for synthetic fiber production to a range of 1000 to 1300, a chromium carbide alloy is particularly applied to the surface of the chromium plating layer or a portion close to the surface, or the entire chromium plating layer. It is important to increase the amount of (Cr23C6) produced. In general, chrome plating produces a large amount of internal stress and chromium (Cr) that absorbs a large amount of hydrogen (H), whereas chrome plating contains high purity carbon (C) composed of the above-mentioned compounds. By using a mixed catalyst such as molecular compounds, a chromium carbide alloy with a high degree of intermolecular bonding is formed on the surface layer of the plating layer, and a high-concentration layer can be formed even inside the plating layer. It becomes possible.

  Next, the frictional resistance value with the yarn for forming the coating of the chromium plating layer in the present invention is preferably 40 to 70 gf, more preferably 40 to 50 gf. A frictional resistance of less than 40 gf by electroplating technology is difficult to put into practical use at present. On the other hand, in the region from 55 gf to 70 gf, the frictional resistance is high and stress is applied to the fiber yarn, but the current quality can be obtained without any problem. Furthermore, the frictional resistance exceeding 70 gf exceeds the range defined by the current production control value. In the region exceeding 70 gf, there is a large possibility that fluffing or single yarn breakage occurs, which is not preferable.

  Next, as for the coating formation thickness of the chromium plating layer in this invention, 10-200 micrometers is preferable. More preferably, it is 30-100 micrometers.

  It should be noted that the plating treatment with a coating thickness of less than 10 μm is difficult to put into practical use at the present time due to the problem that the film thickness cannot be uniformly controlled. In addition, mechanical damage may occur, such as bruises, and durability such as wear resistance may be insufficient. On the other hand, a thickness exceeding 200 μm has already saturated the effect and increases the cost of the plating process. It is not preferable.

  In the synthetic fiber manufacturing yarn path regulating member of the present invention, a chromium plating layer obtained by electroplating a chromium (Cr) compound is coated on the base material surface of a metal yarn path regulating member. The material of the yarn path regulating member base material is not particularly limited as long as it is a metal, but preferably steel materials such as chrome molybdenum steel and carbon steel for mechanical structures, Stainless steel is preferred.

  The synthetic fiber production yarn path regulating member of the present invention can be produced by the following production steps (1) to (9).

  (1) Polishing step, (2) Base surface cleaning step of metal yarn path regulating member, (3) Alkali cleaning step, (4) Roughness adjusting step roughened by blast, (5) Polishing step, (6) Water washing step, (7) Chrome plating treatment step, (8) Surface washing step, (9) Completion of yarn path regulating member, details of each step will be described below.

  (1) A polishing process (mirror polishing) is performed on the surface of the base material by a polishing process. The abrasive used for the polishing process is preferably artificial diamond (industrial diamond), alumina, blue bar (Cr2O3), tripoly, and the like, and thereby polishes to a mirror surface state. Here, the mirror surface state is an arithmetic average roughness Ra of 0.05 to 0.2 μm.

  In order to finish the entire surface of the base material evenly in the roughness adjustment step of (4) roughening with blasting, the surface of the base material to be plated is first polished to a uniform roughness ( It is important to keep the mirror surface state. It also has the meaning of making the roundness of the yarn path regulating member within the production tolerance.

  Next, the base material surface cleaning step (2) of the yarn path regulating member is for facilitating the coating formation of the chromium plating layer on the base material surface of the yarn path regulating member. First, ethanol, thinner, trichlor. The base material surface of the yarn path regulating member is degreased by washing with an organic solvent such as ethylene. As the cleaning liquid, ethanol is preferable from the viewpoint of safety and environment.

  Next, in the alkali cleaning step (3), alkali cleaning (dipping and degreasing) is performed to further improve the adhesion between the chromium plating layer and the surface of the base material of the yarn path regulating member. Adhesion is enhanced by saponifying, emulsifying, swelling and removing the oil on the surface of the yarn path regulating member.

  Next, in the step (4), the arithmetic average roughness Ra roughened by blasting in the roughness adjusting step of roughening by blasting is 0.3 to 5 μm. As the blasting material used for roughening, alumina grid, emery (sand), SUS balls, glass beads and the like are preferable, and among these, alumina grid and emery (sand) are particularly preferable. As a blasting method, the yarn path regulating member may be processed while being rotated on a turntable. At this time, the torch (gun) for injecting the blast material is arranged at right angles to the yarn path regulating member, and the blast material is uniformly applied to the surface of the yarn path regulating member while reciprocating the torch in the axial direction of the yarn path regulating member. It is good to make it hit. The spraying pressure at that time is preferably 0.2 to 0.5 MPa.

  Next, in the polishing step (5), the polishing process is performed to finish the sharp edged dull on the surface of the yarn path regulating member obtained in the step (4), so the meaning is different from the polishing step performed in (1). Of course, different abrasive materials are used. By this polishing process, abnormal protrusions can be corrected (peak cut) at the stage of the base, and the generation of fine protrusions can be remarkably suppressed. A preferable range is polishing about 0.7 to 20% of the height of the dull, and more preferably 0.9 to 1.3%. The abrasive is preferably a fine, soft material such as nonwoven fabric, linen or paper towel.

  Next, it is necessary to sufficiently remove the blast residue adhering to the surface of the yarn path regulating member during the steps (4) and (5) in the water washing step (6). If plating is performed in the presence of this residue, the coating will be formed in a state of wrapping up the residue, and it will not fit in the roughness form within the specified range, and it will be a fine abnormal projection, It is removed.

  Therefore, it is preferable to wash with high pressure water. It is effective when the pressure of the high-pressure water is 0.5 to 1.5 MPa. Then, it is better to dry it at room temperature or heated air.

  Next, a chromium (Cr) compound containing a chromium carbide alloy (Cr23C6) is formed by electroplating in the step (7). Use a special bath (Sargent bath). As a bath component, powder composed of a polymer compound containing chromic anhydride and high-purity carbon (C) is mixed and treated at a bath temperature of about 60 ° C., and the coating formation time is 10 to 200 μm in thickness of the chromium plating layer. For this purpose, the coating is formed by treating for 2 to 8 hours.

In order to coat the chromium (Cr) containing the chromium carbide alloy (Cr23C6), a current density (40 to 220 A / dm ² ) about 2 to 2.5 times that of the chromium plating is usually required.

  Next, (8) it is preferable to wash with hot water and dry with heated air. Further, it is more preferable to use a draining desiccant to which a surfactant, water-soluble silicon, fluorine-based solvent or the like is added.

  Moreover, in prescribing the production conditions in the production of the synthetic fiber of the present invention, preferably the production is that the overall draw ratio is 3 to 6.5 times, the draw speed is 2000 to 6000 m / min, and the yarn strength is 5 to 10 cN / d. A production environment that is effective in the environment, and more preferably high-speed and high-stretching with an overall draw ratio of 5.0 to 6.5 times, a draw speed of 3500 to 6000 m / min, and an original yarn strength of 7 to 10 cN / d. Greater effects can be achieved below.

  In the present invention, the synthetic fiber is a fiber made of a thermoplastic polymer that can be melt-spun and is, for example, polyamide such as nylon 6, nylon 66, nylon 46, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, poly Polyesters such as lactic acid, polyolefins such as polyethylene and polypropylene, polysulfides, polyimides, polyether ketones, polyether nitriles, etc., and copolymers of the above polymers as the main component, and blends of the above two or more polymers It may be a polymer used in combination.

  Next, chromium (Cr23C6) containing chromium carbide alloy (Cr23C6) is formed on the surface of the base material of the metal yarn path regulating guide, the yarn path regulating guide roller, the tension bar, and the drawn entangled air guide, which are the yarn path regulating members for synthetic fiber production. ) Is formed by electroplating, and an example of a method for producing industrial nylon 66 fiber using a yarn path regulating member processed to have a specified roughness will be described.

  Melt spinning is performed with an extruder type spinning machine using nylon 66 chips having a relative viscosity of sulfuric acid of 3.2 to 3.8. The spinning temperature is 280 to 310 ° C., and the spinning pack is filtered using a 15 μm metal nonwoven fabric filter, and then spun through the nozzle holes.

  The spun yarn is surrounded by a heating cylinder having a length of 10 to 50 cm installed immediately below the base, passes through a high-temperature atmosphere heated to 270 to 350 ° C., and then cooled by cold air at a normal temperature of 10 to 25 ° C. Solidified. The yarn path regulating member was disposed after the above process. It arrange | positioned as a thing which prevents a thread | yarn swing at the lower part of a cold wind apparatus. Next, the yarn was arranged on the top and bottom of a device for applying an oil agent mainly composed of a smoothing agent, an electrostatic agent, and a surfactant to prevent the yarn from shaking, and the running yarn was supplied with oil.

  Then, it is wound around the take-up and stretching member and taken up at a predetermined take-up speed. The take-up speed is 300 to 3000 m / min, usually 500 to 2000 m / min. The take-up yarn is wound around a plurality of pair-stretching members that are sequentially rotated at a high speed without being wound up, and is stretched by a difference in speed between the pair-stretching rollers. Further, stretching and entangled air guides were arranged for the purpose of imparting entanglement to the running yarn. Usually, after two or more stages of multi-stretching, the film is relaxed and wound up. Stretching is performed at a glass transition temperature or higher, and final stretching and heat setting are performed at a high temperature of 230 to 250 ° C. The stretching ratio is 2 to 6 times. Furthermore, the yarn path regulation guide is used several times to guide the yarn smoothly (to prevent the tension difference between the yarns of multiple yarns) from occurring in the winding machine disposed thereafter. The feed angle was changed, and an entangled air guide was further placed just before the winder, and entangled and wound up. The winding speed was 2000 to 6000 m / min, and the winding tension was 50 to 250 gf.

Examples 1-3, Comparative Examples 1-4
The base material S45C is used as the yarn path regulating member, and the yarn path regulating guide (shape (a) in FIG. 3) which is the yarn path regulating member for synthetic fiber production shown in FIGS. In producing the guide roller (FIG. 2) and the stretched entangled air guide (FIG. 4), the film formation composition, Cr23C6 content, film formation method, film hardness, number of protrusions, current density, film thickness, blast type, Seven types (Examples 1 to 3, Comparative Examples 1 to 4) of yarn path regulating members having surface arithmetic average roughness Ra and surface roughness area ratio B / A shown in Tables 1 and 2 were manufactured.

  In Examples 1 to 3, the chrome plating containing the chromium compound of the present invention was applied, and the fine protrusions were suppressed and manufactured.

  Of the comparative examples, Comparative Example 1 was formed by the same chromium compound as in Examples 1 to 3, and was subjected to chromium plating without performing the protrusion suppression process.

  The yarn path regulating members of Comparative Examples 2 and 3 are manufactured by performing conventional plating that does not include a chromium carbide compound (Cr23C6) and processing in an environment of conventional protrusion suppression processing. In Comparative Example 4, a yarn path member coated with a plasma spray technique was manufactured.

  Furthermore, the fibers shown in Tables 1 and 2 were produced in the following steps.

  In Example 1 and Comparative Example 1, a Φ8 × 120 L round bar was plated with a chromium carbide compound (Cr23C6), and Example 1 was subjected to a treatment for suppressing protrusions on the plating surface. In Comparative Example 2, the yarn path regulation guide was processed by a conventional electroplating technique not containing a chromium compound, and the fine protrusions were further suppressed.

  In Example 2, a Φ15 × 120 L yarn path regulation guide roller is plated with a chromium carbide compound (Cr23C6) and further treated to suppress protrusions on the plating surface, and Comparative Example 3 does not contain a chromium compound. It was processed by using the electroplating technology.

  In Example 3, the drawn entangled air guide was plated with a chromium carbide compound (Cr23C6), and further treated to suppress protrusions on the plating surface. In Comparative Example 4, two types using thermal spray technology were applied. did.

  In addition, the stretching roller was configured by setting a Nelson-type stretching roller directly in a melt spinning and stretching machine, and using these direct melt spinning and stretching machines, copper acetate as copper was 67 ppm, potassium iodide was 0.1% by weight, and odor A nylon 66 polymer having a sulfuric acid relative viscosity of 3.7 containing 0.1% by weight of potassium fluoride was melt-spun and cooled, and then an oil agent was applied and wound around a take-up roller. The take-up yarn was continuously drawn by being wound around a Nelson type rotating roller whose speed was increased sequentially. The take-up roller was not heated, the feed roller was 45 ° C., the one-stage stretching roller was 150 ° C., the two-stage stretching roller was 230 ° C., and two-stage heat stretching was performed at a stretching ratio of 5 times.

  The yarn after hot drawing was given 4% relaxation with a relaxation roller heated to 120 ° C., and then wound with a wind-up winder at 3600 m / min to produce a multifilament of 1400 dtex and 204 filaments.

  With respect to each yarn path regulating member at this time, the yarn / yarn path regulating member friction resistance, the yarn path regulating member replacement cycle, and the long-term spinning performance were measured by the measurement method described below, and the results are shown in Tables 1 and 2. It was.

  As a result, in Examples 1 to 3, it was possible to produce fiber yarns with less fluff over a long period of time.

  In Comparative Example 1, although the plating treatment for generating the chromium compound was performed, the fine protrusion suppression treatment on the plating surface was not performed. For this reason, it can be expected to have a long life because of its high hardness, but in the first place, the yarn friction resistance is as high as that of the conventional product.

  Moreover, in Comparative Examples 2 and 3, since the treatment was performed by a method with few fine protrusions on the plating surface, a product with few fluffs could be collected for a certain period because the yarn friction resistance was small. This is a conventional chrome plating that has not been done, and since it has poor wear resistance, it has not been a satisfactory result from the viewpoint of extending the service life.

  In addition, in Comparative Example 4 of the thermal spraying technique, it can be said that the life can be extended because the coating hardness is increased if it is described only from the viewpoint of abrasion. I couldn't.

<Measurement of abnormal protrusion>
Using a commercially available cellulose replica film that is cut into a 1cm square and softened with acetone on the surface of a yarn path regulating member selected at 10 random locations within the range of yarn travel (usually immersed for 1 to 5 seconds) The replica film thus made is attached and sampled. The replica film was magnified 230 times with an optical microscope, and abnormal projections were visually observed to count the number of microprojections with one side of the longest axis of 5 μm or more. The average value is shown in Table 1. When the object such as a guide bar having a small diameter is small, the size of the cut sheet of the replica film is appropriately selected and used.

<Frictional resistance of yarn and yarn path regulating member>
It measured using the frictional resistance measuring apparatus shown in FIG. The unwinding speed V of the test yarn 1 from the yarn package 8 is set to 10 m / min, a load W (gf) is applied to the movable pulley 11, and the test yarn 1 is wound around and passed through a yarn path regulating member fixed at a fixed position. The tension at that time was detected by the tension pickup 13 and expressed as a frictional resistance value (gf).

  The specific measurement method in the present invention was such that the load W (gf) was 150 gf, the size of the test roller 12 was φ25 × 100 L, and the surface treatment of the yarn path regulating member shown in each example and comparative example was performed. The test yarn was wound around the test roller 12 at 180 degrees (half circumference).

  The test yarn Y was measured using the yarn of Example 1 that was most stably obtained in the examples, and the test yarn was 1400 dtex of nylon 66 and 204 filaments. Multifilament yarn.

<Thread path regulating member replacement cycle>
As an index of the wear resistance of the coating layer, the number of days elapsed until the yarn / yarn path regulating member frictional resistance reached the use limit value of 200 gf was measured.

<Long-term yarn-making properties>
The long-term stable yarn production with less fuzz and yarn breakage was comprehensively evaluated as follows.
◎ ... Continuous yarn production is possible for more than 3 years.
○: Continuous yarn production is possible for 1 to less than 3 years.
Δ: Continuous yarn production is possible for 3 months to less than 6 months.
X: Continuous yarn production is possible for less than 3 months.

It is explanatory drawing which shows an example of the fiber manufacturing apparatus which shows the outline | summary of the manufacturing process of a fiber. It is a figure which shows the front view and example of plating (thick line part) of an example of a yarn path regulation guide roller. It is a figure which shows the front view and example of plating (thick line part) of an example of a yarn path regulation guide. It is a figure which shows the front view of an example of an extending | stretching entanglement provision air guide, and the example of plating (thick line part). It is a figure which shows sectional drawing of a plating film and a base material. It is a load length-cutting level relationship figure regarding a relative load length curve. It is explanatory drawing which shows a frictional resistance measuring apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Yarn 2 Yarn path regulation guide 3 Yarn path regulation guide roller 4 Feed roller 5 Stretching entanglement air guide 6 Stretching roller 7 Winder 8 Yarn package 9 Base material 10 Plating film (thick line part)
11 Moving pulley 12 Test roller 13 Tension pickup

Claims (7)

A yarn path regulating member in which a chromium plating layer formed by electroplating a chromium compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ) is coated on the surface of a metal base material, and is present on the surface of the chromium plating layer The number of fine protrusions whose one side of the longest axis is 5 μm or more is 1 or less per 1 cm square of the surface within the yarn travel range of the yarn path regulating member , and the surface of the chromium plating layer is in accordance with JIS-B0601: 2001 regulations. A load length ratio (%) and a cutting level (%) representing a relative load length Rmr whose surface roughness is an arithmetic average roughness Ra of 0.3 to 5 μm and specified in JIS-B0601: 2001. In the Cartesian coordinates, the total triangular area surrounded by the straight line a connecting the coordinate points (0, 0), (100, 100), a line with a load length ratio of 0%, and a line with a cutting level of 50% is denoted by A. Cutting level of the orthogonal coordinates In 0-50% of the area, when the total area surrounded by the said line a relative load length curve b is B, the area ratio B / A is characterized by a 10% to 35% synthetic Yarn regulating member for fiber production. 2. The yarn path regulating member for producing synthetic fiber according to claim 1, wherein the chromium plating layer has a coating hardness of Hv 950 to 1300. 3. The yarn resistance regulating member for synthetic fiber production according to claim 1 or 2 , wherein a frictional resistance value with the yarn on the surface of the chromium plating layer is 40 to 70 gf. The yarn path regulating member for synthetic fiber production according to any one of claims 1 to 3 , wherein the chromium plating layer has a thickness of 10 to 200 µm. The drawn yarn path regulating member for synthetic fiber production according to any one of claims 1 to 4 , wherein a content of the chromium carbide alloy (Cr ₂₃ C ₆ ) in the chromium plating layer is 1 to 8%. . It blasted into metal yarn path regulating member surface after the polishing process, the manufacture of synthetic fibers for manufacturing yarn path regulating member for electroplating process chromium compound containing chromium carbide alloy (Cr ₂₃ C ₆₎ It is a method , Comprising: The said electroplating process controls the ripple content rate of a rectifier to 5% or less, and is processed by 20-220 A / dm < ² > of current density , The yarn path control member for synthetic fiber manufacture characterized by the above-mentioned Manufacturing method. A synthetic fiber production method, wherein the synthetic fiber is drawn using the yarn path regulating member for synthetic fiber production according to any one of claims 1 to 5 .

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