JP2004292955A - Monofilament and method for forming the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monofilament having high metal characteristics and reliability in combination and to provide a method for forming the same. <P>SOLUTION: The monofilament is formed by providing a first step of extruding a molten compound containing ≥50 wt.% of metal powder in a resin having a polymer in which the molecule is regularly arranged in a fluid state from a die of an extruder 1 into a stringy form, placing the tip on a conveyor 2 and thereby drawing the stringy compound between the die and the conveyor 2 and a second step 2 of continuously translating the stringy compound parallel in the extrusion direction of the conveyor 2, drawing and solidifying the stringy compound by revolution of the conveyor 2. Thereby, the monofilament having both of the metal characteristics and flexibility can be obtained with good mass productivity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filament containing a metal, and particularly to a monofilament having high metal properties and reliability and a method for forming the same.
[0002]
[Prior art]
It is known that a metal powder and a thermoplastic resin are melt-kneaded and extruded to form a monofilament having a desired shape. Here, in order to improve the characteristics of the metal powder contained in the monofilament, it is necessary to contain more metal particles. However, when the filling rate of the metal powder is increased, the discontinuity of the thermoplastic component increases, and the mechanical strength of the monofilament decreases. For this reason, there is a problem that a break occurs during the production or use of the monofilament. In particular, monofilaments have a very small cross-sectional area among molded products produced by extrusion molding, so that the mechanical strength is significantly reduced due to high filling of the contained metal powder. Thus, there is a trade-off between the improvement of the metal properties of the monofilament and the mechanical strength.
[0003]
Therefore, in the fibrous organic polymer containing the magnetic particles, by uniformly dispersing the magnetic particles as fine particles, the discontinuity of the polymer component forming the fiber is reduced, and suitable flexibility and Magnetic fibers having a fiber strength that can withstand processing have been proposed.
[0004]
[Patent Document 1] Japanese Patent Application Laid-Open No. 7-197311
However, the agglomeration rate of the particles becomes larger as the diameter becomes smaller. In particular, when the content of the metal particles in the resin is increased, the distance between the primary particles of the fine particles becomes shorter, and the fine resin is surrounded between the primary particles. Secondary particles may be generated, and the resin inside the secondary particles may be locally deteriorated by each primary particle.
[0006]
The effect of such secondary particles can be improved to some extent by adding a lubricant or a metal deactivator, but the mechanical strength decreases when the amount of addition increases.
[0007]
In addition, since the specific gravity of the metal powder reaches several times that of the liquid resin, it becomes difficult to keep these dispersed states uniform as the content of the metal powder increases, and the content of the metal powder has a limit. . For this reason, even if the content of the metal powder in the resin is adjusted in the extruder, the density of the metal powder of the extruded monofilament is not uniform. For this reason, uniform mechanical strength cannot be obtained as a whole, and a continuous monofilament cannot be obtained.
[0008]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a resin monofilament having high metal properties and reliability even when metal powder is highly filled, and a method for producing the same.
[0009]
[Means for Solving the Problems]
The present invention is a monofilament containing metal particles in a resin, wherein the content of the metal particles is 50 wt% or more, and the resin has a polymer in which molecules are regularly arranged in a fluid state. A continuous monofilament characterized in that: As a result, a monofilament having both metal properties and flexibility can be obtained with good mass productivity.
[0010]
The resin is preferably molecularly oriented in a direction parallel to the axis of the amorphous structure. Thereby, a monofilament having excellent elasticity in the axial direction can be obtained.
[0011]
The resin preferably has an amorphous structure, whereby a monofilament having a stable diameter can be obtained. In particular, an elastomer is preferable. Such a polymer material obtained by copolymerizing a hard segment and a soft segment has an intermediate property between a vulcanized rubber and a plastic, and thus has a wide range of properties from a soft rubber to a portion close to a plastic. Thereby, a monofilament excellent in moldability and mechanical strength can be obtained. In the case of a thermoplastic elastomer, it is also possible to recycle.
[0012]
Further, it is preferable to use at least two kinds of thermoplastic resins having different melting points, because the change in viscosity before and after curing can be greatly reduced.
[0013]
In the monofilament of the present invention, the variation in the cross-sectional diameter perpendicular to the axis from the tip to the end of one axis is in the range of 40% or less from the average value. By having a substantially constant diameter, constant characteristics and mechanical strength can be obtained as a whole.
[0014]
Further, the primary particle diameter of the metal particles is 1 μm or more, and the average diameter of the cross section is 50 to 150 times the primary particle diameter of the metal particles. Thereby, a monofilament having more excellent metal properties can be obtained.
[0015]
The method for forming a monofilament of the present invention is a method for forming a monofilament containing metal particles in a resin, wherein a molten compound containing 50 wt% or more of metal powder in a resin is formed into a string from a die of the extruder 1. And a first step of extending the string-like compound between the conveyors 2 from the dies by placing the tip portion on the conveyor 2, and continuously extruding the string-like compound by rotation of the conveyor 2. And a second step of performing parallel movement in the direction and stretching and solidifying. Thereby, even if the mixing state of the particles in the resin is not uniform, monofilaments having a certain dimension can be obtained with good mass productivity. In addition, by measuring the diameter of the string-like compound and winding it up with the rotary take-up machine 4 whose winding speed is adjusted according to the diameter value, the string-like compound in the first step and the second step is obtained. The stretch ratio can be adjusted, and a monofilament excellent in dimensional accuracy can be obtained.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
As a result of various experiments, the inventors of the present application have found that the reliability of a monofilament highly filled with a metal powder is caused by the fact that the rate of change in viscosity during curing of a resin is expanded by the metal powder. It came to be.
[0017]
When a metal powder and a thermoplastic resin are melt-kneaded and extruded to form a monofilament, the diameter of the monofilament is substantially determined by the die diameter of the extruder. However, when the diameters of the primary particles and the secondary particles of the metal powder to be contained are large or the packing density is high, if the die diameter is matched with the desired monofilament diameter, the metal powder diameter relative to the die diameter becomes large and the die diameter becomes large. Clogging occurs. In addition, a method of obtaining a monofilament having a desired diameter by stretching while a solid molded product extruded from a die diameter has heat is known. Since the viscosity change is large, it is difficult to obtain a uniform film thickness over the entire monofilament. Further, when the metal powder is highly filled, the heat radiation of the resin is improved, so that the curing speed and the heat radiation speed of the residual heat after the curing are increased, and it is difficult to change the extruded molded product into a desired shape. is there.
[0018]
Therefore, the invention of the present application, by using a resin whose viscosity change is gradual at the time of curing and at the time of heat radiation of the molded article, to increase the filling of the metal powder in the monofilament, to increase the relative ratio of the primary particle diameter of the metal powder to the monofilament diameter, and It is possible to improve the mechanical strength of monofilament.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the monofilament and the method for forming the same according to the present invention will be described in detail.
(Metal powder)
The metal powder used for the monofilament of the present invention is not particularly limited. However, when a metal powder having high thermal conductivity is used, the effect of the present invention is remarkably exhibited. In other words, a metal powder having high thermal conductivity enhances the heat dissipation of the resin, so that the resin filled with such a metal powder at a high temperature is immediately cooled. According to the present invention, a molded product extruded in a molten state can be stretched with high precision by selecting a resin whose viscosity changes slowly during cooling.
[0020]
A metal powder having Fe has high thermal conductivity. Examples of these metal powders include iron powder and magnetic powder.
[0021]
Iron powder has iron powders having respective characteristics depending on the forming method, and examples thereof include reduced iron, electrolytic iron, atomized iron, and carbonyl iron.
[0022]
Reduced iron can be obtained by reducing the scale generated during the rolling of iron ore or steel together with coke and limestone to form spongy iron, pulverizing it, and reducing it in an ammonia pyrolysis gas. The particle shape of the reduced iron is irregular. In addition, since pores are present in the particles, the stretching step can be performed with high reliability and excellent wettability to the resin.
[0023]
Electrolytic iron can be obtained by electrolyzing an aqueous solution of iron sulfate, iron chloride, or the like, pulverizing pure iron deposited on the cathode, and performing annealing treatment. The particle shape of the electrolytic iron is flat, and it is possible to improve the filling factor and to make the iron characteristics uniform on the monofilament surface.
[0024]
Atomized iron can be obtained by spraying high-pressure water onto a molten steel stream, pulverizing the molten steel stream, and performing reduction treatment in AX gas to remove an oxide film on the surface. The particle shape is relatively spherical, and due to the presence of many fine irregularities on the particle surface, even when the resin is highly filled, the generation rate of secondary particles is low, and a monofilament having good reliability is obtained. can get.
[0025]
Carbonyl iron is iron powder formed by the carbonyl method. The carbonyl method is a metal refining method utilizing thermal decomposition of metal carbonyl, which is obtained by reacting iron with carbon monoxide to obtain iron carbonyl (Fe (CO) ₅ ) and thermally decomposing it. it can. The particle shape is spherical and there are few surface irregularities. Particles having such a shape have excellent wettability with the resin and dispersibility in the resin. Further, it is possible to suppress a decrease in viscosity due to cutting of the resin in the kneading and stretching steps.
[0026]
The magnetic powder according to the present invention is preferably a rare earth magnetic powder, but a ferrite magnetic powder or the like can also be used. For example, neodymium-iron-boron magnetic powder (Nd2Fe14B), iron-chromium-cobalt magnetic powder (Fe-Cr-Co), praseodymium magnetic powder (Pr-Fe-B-Cu), samarium-cobalt magnetic powder (SmCo5, Sm2Co17) ) Etc. can be used.
[0027]
The rare earth-based magnetic powder is preferably an Sm-Fe-N-based powder. By containing Sm, magnetic anisotropy and saturation magnetization are increased, and excellent magnetic properties as a permanent magnet material can be obtained. However, part of Sm may be replaced with at least one of Y, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. Further, part of Fe may be replaced with at least one or more of Co, Ti, V, Cr, Mn, Ni, Cu, Zn, Zr, Hf, Nb, Ta, Mo, W, Ga, and Al. . As the fourth element, at least one element of an alkali metal and an alkali metal may be contained in the magnetic powder in a range of 0.001 to 0.3 atomic%, thereby providing a stable magnetic property. Characteristics are obtained. If the content is less than 0.001 atomic%, the magnetic properties will not be stabilized, and if it exceeds 0.3 wt%, an oxide of an alkaline earth metal will be generated, and the magnetic properties will be greatly reduced, which is not preferable.
[0028]
The content of the rare earth metal is preferably 3 to 30 atomic%. If it is less than 3 atomic%, an α-Fe phase is generated, and the coercive force is particularly reduced. If the content is more than 30 atomic%, the rare earth metal precipitates and the residual magnetization decreases. Further, the content of N is preferably 5 to 15 atomic%. If it is less than 5 atomic%, little coercive force is exhibited, and if it is more than 15 atomic%, an impure phase composed of a rare earth metal and a nitride of iron itself is generated, and the magnetic properties are remarkably deteriorated.
[0029]
Next, a method for forming a rare earth magnetic powder will be described, but the method is not limited thereto.
As a raw material, a raw material powder containing a rare earth-based oxide is used. Metallic calcium is added as a reducing agent to obtain a raw material mixture. Next, the raw material mixture is fired and reduced and diffused in an inert gas atmosphere to reduce rare earth oxides and the like in the raw material mixture. Subsequently, after the inside of the furnace is evacuated, a nitriding process is performed by firing in an atmosphere containing a nitrogen gas to obtain a nitride block. The nitride block is washed with water to remove calcium-based by-products. The magnetic powder thus formed has almost no residue such as by-products containing calcium as a main component and unreacted calcium on the powder surface, has calcium only inside the powder, and has a uniform particle size. And a specific surface area of 1 to 2 m 2 / g, which is almost spherical. Further, the magnetic powder is excellent in coercive force, squareness ratio and heat resistance.
[0030]
The metal powder used in the present invention is preferably subjected to a surface treatment. By modifying the particle surface, wettability with resin, environmental resistance, and heat resistance can be improved.
[0031]
Specifically, a coating layer made of an inorganic substance and / or an organic substance can be provided on the surface of the particles by chemical conversion treatment, plating, vapor deposition, or the like. For example, a silica film can be formed on the particle surface by mixing a metal powder and ethyl silicate and baking them under predetermined conditions. Further, when further mixed with a silane-based coupling agent and fired under predetermined conditions, an organic chain can be formed on the silica film.
[0032]
In the present invention, the content of the metal powder in the resin is preferably from 50 wt% to 95 wt%, and more preferably from 65 wt% to 90 wt%, in consideration of the metal properties and mechanical strength of the monofilament. When the content is 75 wt% to 85 wt%, the relative ratio of the metal particle diameter to the monofilament diameter can be increased with high reliability, which is preferable.
[0033]
In the present invention, the average particle size of the primary particles of the metal powder is preferably 1 μm to 50 μm, more preferably 1 μm to 30 μm, and further preferably 2 μm to 10 μm. The primary particles defined in such a range are excellent in dispersibility, and can suppress the enlargement of the secondary particles generated when the resin is highly filled in the resin. In addition, good metal properties can be stably obtained. Here, the average particle size of the primary particles in the present specification is a value measured by a Fischer sub-sieve sizer (FSSS), and is obtained by measuring a specific surface area by an air permeation method. The average value of the particle size of the primary particles obtained is shown below.
[0034]
(resin)
The resin used in the present invention is characterized by having a polymer in which molecules are regularly arranged in a fluid state. Examples of such a resin include a liquid crystal polymer resin, a thermoplastic elastomer having an amorphous structure, and a thermosetting elastomer.
[0035]
The liquid crystal polymer resin has a very low coefficient of thermal expansion, and hardly causes any thermal expansion that is harmful to the contained metal powder. Further, by being softened by heat, the extruder 1 is excellent in workability after being extruded from the die. Such a liquid crystal polymer resin is a polymer that exhibits molecular orientation in a molten state like a solid crystal, and when cooled as it is, the molecular orientation structure is solidified as it is, and the state is kept stable. In addition, since the molecular chains are oriented in the flow direction at the time of molding, good elasticity can be obtained in the axial direction of the monofilament, and high reliability can be maintained during molding and use. In addition, despite the good fluidity, the solidification rate is high, so that the generation of burrs on the surface of the monofilament can be suppressed.
[0036]
The elastomer in the present invention is a hybrid resin in which a member having a plastic property as a hard segment and a member having a rubber property as a soft segment coexist, and examples thereof include a thermoplastic elastomer.
[0037]
As thermoplastic elastomers, styrene-based elastomer (SBC), PVC-based elastomer (TPVC), olefin-based elastomer (TPO), urethane-based elastomer (TPU), polyester-based elastomer, nitrile-based elastomer, polyamide-based elastomer (TPAE), fluorine-based Elastomers, chlorinated polyethylene (CPE), 1.2 polybutadiene, trans 1.4 IR, silicone-based elastomers, chlorinated ethylene copolymer alloys, ester halogen-based polymer alloys, and the like.
[0038]
Among the thermoplastic elastomers, those having a hard segment having particularly high fiber-based performance are preferable, and examples thereof include polyamide-based elastomers, olefin-based elastomers, polyester-based elastomers, and chlorinated polyethylene.
[0039]
Further, as the resin of the present invention, a resin obtained by mixing at least two types of thermoplastic resins having different melting points can be used. In such a resin, the resin molecules having a high melting point are regularly arranged in a fluid state in which the resin molecules having a low melting point are molten. Thereby, the melting point range in the whole becomes broad, and the molded product extruded from the die of the extruder 1 can be stretched with high dimensional accuracy.
[0040]
In the monofilament of the present invention, in the uniaxial direction, the variation in the cross-sectional diameter perpendicular to the axis is preferably in the range of 40% or less from the average value, more preferably 25% or less from the average value, and further from the average value. It is preferable to be within the range of 15% or less. As described above, a monofilament having a substantially uniform thickness in the axial direction has good mechanical strength both during molding and during use, and can have substantially uniform metal properties as a whole. Here, the variation of the cross-sectional system in the present invention can be obtained by using a laser-type transmission sensor to detect a shadow of an object in a laser area as a change in light amount.
[0041]
Hereinafter, an example of the monofilament of the present invention will be described along the forming method of the present invention, and an application example of the monofilament will be described.
Embodiment 1 FIG.
After mixing 75 wt% of powdered reduced iron and 25 wt% of powdered polybutylene terephthalate elastomer with a Henschel mixer, they are melted at 230 ° C. Next, kneading and pelletizing are performed to obtain a compound.
[0042]
(First step)
The obtained compound is put into a single-screw extruder, and the compound is extruded in a string form from a die having a diameter of 1.5 mm, and the leading end of the compound is placed on a metallic rotary conveyor 2 in a molten state. As a result, the leading end of the string-like compound is pulled by the rotating conveyor 2, and the string-like compound is stretched from the die to the space between the conveyors 2.
(Second step)
Subsequently, by the rotation of the conveyor 2, the string-like compound is continuously translated in the extrusion direction and stretched and solidified.
[0043]
The diameter of the cross section perpendicular to the axial direction of the softened string compound having residual heat after the second step is measured by the diameter measuring sensor 3. At least one of the diameter measuring sensors 3 may be installed between the extruder 1 and the take-up machine 4, and the number and locations of the sensors are not particularly limited. In the method for forming a monofilament of the present invention, the cord-like filament is stably drawn in a molten state over a long period of time by the action of the conveyor 2, and the diameter is previously adjusted between any of the molten state and the residual heat-containing solidified state. By measuring and increasing / decreasing the one-action stretching force according to the measured value, it is possible to further suppress the variation in the diameter in one axis.
[0044]
According to the diameter measurement, the speed of the take-up machine 4 is adjusted, and the speed is passed between a pair of rolls installed in front of the take-up machine 4. In this embodiment, the desired monofilament diameter is 0.8 mm, and the speed of the take-off machine 4 is set in consideration of the relationship between the diameter measured in the second step and the desired monofilament diameter. By adjusting the speed at which the formed monofilament is drawn, the stretching ratio of the molten monofilament in the first and second steps can be finely adjusted. As described above, the monofilament forming method of the present invention can form a monofilament having excellent dimensional accuracy by selecting a resin having a small change in viscosity before and after curing and stabilizing the diameter of the monofilament over a long period of time. .
[0045]
The diameter of the monofilament thus obtained is in the range of 0.7 mm to 0.9 mm in one axis, and the variation of the cross-sectional diameter is 12.5% from the average value. When a part of the obtained monofilament is subjected to a tensile tester and subjected to a strength test for measuring the energy from the tensile stress and the displacement to the fracture, the energy value becomes 0.032 M · m, indicating that the material has high reliability. I can say. Here, the tensile tester has a load section for supporting the both ends of the test piece and applying a tensile load and a measuring section for measuring the stress from the test piece, and applying a tensile load to both ends of the test piece. By measuring the stress and displacement (elongation) at the time of breaking, the energy up to breaking can be measured.
[0046]
Embodiment 2. FIG.
A monofilament was prepared and evaluated in the same manner as in Example 1 except that electrolytic iron was used instead of reduced iron and the content was 70 wt%, and the same effects as in Example 1 were obtained. .
[0047]
Embodiment 3 FIG.
A monofilament was prepared and evaluated in the same manner as in Example 1 except that carbonyl iron was used instead of reduced iron. The energy value in the strength test was 0.032 M · m. And the reliability is dramatically improved.
[0048]
Embodiment 4. FIG.
A monofilament was prepared and evaluated in the same manner as in Example 3 except that the content of carbonyl iron was changed to 90% by weight. Has excellent magnet attraction.
[0049]
Embodiment 5 FIG.
Instead of reduced iron, a monofilament was used in the same manner as in Example 1 except that an alloy magnetic powder having an acicularity coefficient of 83% and a circularity coefficient of 87% and comprising Sm-Fe-NO-Ca was used. When it was created and evaluated, the same effects as in Example 1 were obtained.
[0050]
Embodiment 6 FIG.
Except that the content of the alloy magnetic powder was 85% and the desired monofilament diameter was 0.9 mm, it was formed and evaluated in the same manner as in Example 5, and the dimensional properties were the same as in Example 4. And the magnetic properties are superior to those of the fifth embodiment.
[0051]
Embodiment 7 FIG.
After performing the first step and the second step on the obtained molten compound, it is carried out except that it is wound by a take-up machine 4 whose take-up speed is adjusted to 1.2 times the rotational speed of the metallic rotary conveyor 2. When a monofilament is formed in the same manner as in Example 1, a monofilament having a desired diameter can be obtained more stably than in Example 1. The take-up speed is preferably adjusted in the range of 1 to 2 times the rotation speed of the conveyor, more preferably in the range of 1 to 1.7 times, and still more preferably in the range of 1.1 to 1.4 times. Preferably. If the take-up speed is set lower than the rotation speed of the conveyor, it is not preferable because it is relatively difficult to adjust the diameter of the monofilament with a good yield, and if the take-up speed is set faster than 2 times speed, excellent dimensional stability by the stretching mechanism of the conveyor is obtained. It is not preferable because the effect is reduced.
[0052]
Comparative example.
Except for using polyethylene terephthalate in place of the polybutyrene terephthalate elastomer, when a monofilament is formed in the same manner as in Example 1, the viscosity rapidly increases in the stage of the first step, and disconnection occurs in the third step. Occurs.
[0053]
Application example 1.
When the monofilament using carbon powder instead of reduced iron in Example 1 and the monofilament described in any of Examples 1 to 4 are alternately braided, a single-layer electromagnetic wave capable of absorbing a wide frequency band in the whole region is obtained. An absorber sheet can be formed. The electromagnetic wave absorbing sheet of this application example has excellent flexibility, and can be laminated with an adherend and other sheets with high adhesion. In addition, the molded product can be wound and transported in a roll shape, and can be easily handled.
[0054]
Application example 2.
In a hook / loop type touch fastener in which two surfaces are pressed and connectable, one surface has a base and a hook or a loop attached to one surface of the base, and is mounted on at least one of the base and the hook or the loop. When the monofilament described in Examples 1 to 4 is contained, a touch fastener excellent in magnetic attraction and flexibility can be obtained. The touch fastener of this application example uses a mold in which a magnet is embedded on the bottom surface, and fixes the magnetically attractable touch fastener of this application example to the magnet, and then injection-molds a molding material to improve the performance of the fastener. It can be integrated with the molding material without loss. Such molded articles include foam seats for automobiles and airplanes. It is also possible to integrally mold with other types of molding materials other than the foam.
[0055]
Application example 3.
When the monofilament described in Examples 5 and 6 is woven as a part of the filter body, a magnetic filter capable of efficiently removing iron powder is obtained.
【The invention's effect】
The monofilament of the invention of the present application makes it possible to use a resin having a small change in viscosity before and after curing to achieve a large particle size and high filling of metal particles to be contained with high reliability. As a result, a monofilament having both excellent metal properties and reliability can be obtained. Further, the monofilament can be obtained with good mass productivity by the method for forming a monofilament of the present invention.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an apparatus used in the present invention.
DESCRIPTION OF SYMBOLS 1 ... Extruder 2 ... Conveyor 3 ... Diameter measuring sensor 4 ... Take-off machine 5 ... Storage part 6 ... Monofilament

Claims (9)

A monofilament containing metal particles in a resin, wherein the content of the metal particles is 50 wt% or more, and the resin has a polymer in which molecules are regularly arranged in a fluidized state. Continuous monofilament. The monofilament according to claim 1, wherein the resin is molecularly oriented in a direction parallel to an axis. The monofilament according to claim 1, wherein the resin has an amorphous structure. The monofilament according to claim 3, wherein the resin is an elastomer. The monofilament according to claim 1, wherein the resin has at least two types of thermoplastic resins having different melting points. The monofilament according to any one of claims 1 to 5, wherein a variation in a cross-sectional diameter perpendicular to the axis from the tip to the end of the axis is within a range of 40% or less from an average value. 2. The monofilament according to claim 1, wherein a primary particle diameter of the metal particles is 1 μm or more, and an average diameter of the cross section is 50 to 150 times the primary particle diameter of the metal particles. A method for forming a monofilament containing metal particles in a resin,
A molten compound containing 50 wt% or more of metal powder in a resin is extruded from a die of an extruder 1 in the form of a string, and a tip portion is placed on a conveyor 2 so that the string-shaped compound between the die and the conveyor 2 is formed. A first step of stretching, and a second step of stretching and solidifying the string-like compound by continuously moving the string-like compound in a direction of extrusion by rotation of the conveyor 2,
A method for forming a monofilament, comprising: After measuring the diameter of the string-shaped compound with the diameter measuring sensor 3, the winding is performed by the rotary take-up machine 4 whose winding speed is adjusted according to the diameter value, so that the first step and the second step are performed. The method for forming a monofilament according to claim 8, wherein the stretching ratio of the cord-like compound is adjusted.

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