KR20230060244A - Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate conjugate multi filament, and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a cis-core type polyphenylene sulfide composite multifilament comprising a sheath unit and a core unit, and specifically, to a polyphenylene sulfide composite multifilament and a method for manufacturing the same, wherein the sheath unit comprises a polyphenylene sulfide resin, and the core unit comprises a polyester resin having intrinsic viscosity of 0.80 to 1.20 dl/g.

Description

Polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament and manufacturing method thereof

The present invention relates to a composite multifilament of polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate, and a composite of polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate with excellent heat resistance and chemical resistance. It relates to a multifilament and a manufacturing method thereof.

Polyphenylene sulfide fibers have a variety of markets, including not only the industrial fields of battery separators, dust collector filters, and interior materials for automobiles, but also the interior fields of wallpaper, curtains, sofas, and bedding, and the protective clothing fields of industrial protective clothing and protective gloves. In recent years, as the demand for chemical resistance and flame retardancy has increased, its use has been increasing.

In particular, it is a filter material used for filters in filter cloth dust collectors. It is generally made of polyphenylene sulfide fibers, unlike non-woven fabrics made of glass fiber (Glass), meta aramid (MA), teflon (PTFE), polyimide (PI), etc. The prepared non-woven fabric is attracting attention as a heat-resistant filter material due to excellent heat resistance, chemical resistance, low absorption characteristics, and shape stability of polyphenylene sulfide fibers.

Meanwhile, polyphenylene sulfide fibers are manufactured through a melt spinning process. Specifically, melting and supplying PPS; Extruding the melt through a spinneret having a plurality of spinnerets to form a filament bundle having a plurality of filaments, cooling and solidifying the melt, and then introducing the melt into a plurality of cans; And, the step of multi-stage stretching the filament bundles in these multiple cans; it can be manufactured through.

However, since these polyphenylene sulfide fibers have disadvantages such as high polymer price, cutting due to poor solidification during the spinning process, and poor crimp expression in the drawing process, the yield can be improved by improving the processability of PPS fibers. There is a need for technology.

As a technology for improving the processability of polyphenylene sulfide fibers, German Patent DE No. 4006397 relates to a technology for producing polyphenylene sulfide multifilaments by applying high-temperature air or inert gas under a spinneret and then going through a drawing process. Japanese Unexamined Patent Publication No. 1991-168750, which relates to a technique of blowing an air current of 45 ° C. or higher into spun polyphenylene sulfide fibers, cooling them, and passing them through a heated region to heat-stretch them, and polyphenylene sulfide resins from 310 to 310 It is melted at a temperature of 340 ° C. and continuously spun through a hole with a diameter of 0.1 to 0.5 mm in a spinneret to produce multifilaments, which are passed through a high-temperature atmosphere sealed by an insulating tube or a heating tube, and then 100 ° C. There is Japanese Unexamined Patent Publication No. 1990-219475 relating to a technique of cooling with the following warm air flow or cold air flow.

In addition, patents related to polyphenylene sulfide fibers used as filter materials include European Patent No. 386,975, which uses polyphenylene sulfide fibers for filtration of high-temperature gas, and polyphenylene sulfide and acrylic fibers. PCT-US2007-019827 relates to a phenylene sulfide bag filter.

The above technologies have the significance of improving the filter characteristics by introducing polyphenylene sulfide fibers into dust collection filters that require heat resistance, but the spinning defects that occur during the cooling and solidification process when the molten polymer is continuously passed through the spinneret have the same problem

Due to the above-described poor spinning, most polyphenylene sulfide fibers use a polyphenylene sulfide resin in the sheath for spinning, and a composite that uses a polyester resin, a polyamide resin, or a polyolefin resin in the core part. After being made of fibers, they have been cut to a certain length to make short fibers, and then made into spun yarns and used.

However, the polyphenylene sulfide composite fiber used in the form of spun yarn as described above has a problem in that heat resistance and chemical resistance are lowered because the resin of the core portion is exposed at both ends of the single fiber.

In order to solve the above problems, Korean Patent Registration No. 2183246 proposes a composite multifilament in which a high-viscosity polyester resin is used for the core part and polyphenylene sulfide resin is used for the sheath part, but the polyester resin for the core part Compared to the multifilament formed only of polyphenylene sulfide resin using the four heat, there was a problem of low hydrolysis resistance.

The present invention was invented to solve the problems of the prior art as described above, and is a polyphenylene sulfide that can be used as a composite multifilament rather than a single fiber because of its excellent hydrolysis resistance and low heat shrinkage without the addition of a hydrolysis agent. and a poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament.

In addition, polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament with excellent heat resistance and chemical resistance are used as long fibers instead of short fibers by cutting poly1,4-cyclohexylenedimethylene terephthalate composite multifilaments to a certain length. It is an object to provide a cyclohexylenedimethylene terephthalate composite multifilament.

In addition, polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate have excellent physical properties by improving spinning and stretching properties of composite multifilaments of polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate. It is an object of the present invention to provide a manufacturing method capable of manufacturing a composite multifilament.

In order to solve the above problems, the present invention is a sheath-core type polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament formed of a sheath part and a core part, wherein the sheath part is poly Polyphenylene sulfide, characterized in that it is formed of phenylene sulfide resin, and the core portion is formed of poly1,4-cyclohexylenedimethylene terephthalate (PCT) resin, and A poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament is provided.

In addition, the sheath part and the core part provide a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that formed in an area ratio of 7:3 to 3:7.

In addition, the composite multifilament is a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament characterized in that the fineness is 250 to 700 denier, the number of filaments is 70 to 200, and the single yarn fineness is 2 denier or more. to provide.

In addition, the present invention is a method for manufacturing a sheath-core type composite multifilament formed of a sheath part and a core part, wherein the sheath part is polyphenylene sulfide resin, and the core part is poly1,4-cyclohexylenedi A spinning step of composite spinning in a sheath-core form using Poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin; A cooling step of cooling the spun composite multifilament at 20 to 25 ° C; A first winding step of winding the cooled composite multifilament at 1000 to 2500 m/min to produce an undrawn yarn; A drawing step of drawing the wound unstretched yarn at a speed of 300 to 600 m/min using two or more rollers; A shrinking step of shrinking the stretched composite multifilament at an overfeed of 0.95 to less than 1.0; and a secondary winding step of winding the contracted composite multifilament.

In addition, the temperature of the first elongation roller in the elongation step is 70 ~ 100 ℃ and the temperature of the last elongation roller is 150 ~ 250 ℃ polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite, characterized in that A multifilament manufacturing method is provided.

In addition, it provides a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method characterized in that the stretching is performed at a stretching ratio of 2.0 to 4.0 times in the stretching step.

The shrinking step provides a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method, characterized in that carried out between the last drawing roller and the next roller in the drawing step.

As described above, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention uses polyphenylene sulfide resin in the sheath part and poly 1,4-cyclohexylene in the core part. By using dimethylene terephthalate, it has excellent spinnability and can be used as a multifilament.

In addition, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament of the present invention is cut to a certain length and used as a long fiber rather than a short fiber, so that the effect of excellent heat resistance and chemical resistance is obtained. there is.

In addition, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method of the present invention optimizes the spinning and drawing steps, so that the processability is excellent.

1 is a diagram showing a process diagram of a method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilaments according to the present invention.
2 is a view briefly showing a second step of a method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts are denoted by the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted in order not to obscure the gist of the present invention.

As used herein, the terms 'about', 'substantially', and the like are used in a sense at or approximating that number when manufacturing and material tolerances inherent in the stated meaning are given, and are intended to convey an understanding of the present invention. Accurate or absolute figures are used to help prevent exploitation by unscrupulous infringers of the disclosed disclosure.

1 is a diagram showing a process diagram of a method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention, and FIG. 2 is a view showing polyphenylene sulfide and poly1 according to the present invention. , 4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method of the second step is a schematic diagram showing.

The present invention relates to a sheath-core type polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament formed of a sheath part and a core part.

When the polyphenylene sulfide resin is spun alone to make fibers, cutting problems due to poor solidification and poor crimp expression during the stretching process may occur. It is a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament using silenedimethylene terephthalate resin.

The polyphenylene sulfide resin forming the sheath portion is a crystalline engineering plastic having a relative viscosity of 0.1 to 10, and has high heat resistance and excellent mechanical properties, chemical resistance, electrical properties, and dimensional stability. Examples of applications include electric/electronic parts, automobile parts, mechanical parts, and the like.

In addition, the polyphenylene sulfide resin may be a linear, cross-linked, or semi-cross-linked polymer, but it is preferably linear, has a weight average molecular weight (Mw) of 2,000 to 8,000, and melts at 300 ° C and a load of 2.16 kg. A melt flow index of 20 to 150 g/10 min may be used, and a melt flow index of 30 to 100 g/10 min may be preferable.

In addition, black coloring is required to use as an automobile interior material by using the mechanical and chemical durability, which are the above characteristics of Polyphenylene sulfide, and a dope-dyeing method in which a colorant is added in the pre-spinning process is used to improve color fastness. can be excellent. The dyeing process is preferably used when expressing basic colors such as black, indigo, and brown.

The core part may use poly1,4-cyclohexylenedimethylene terephthalate (PCT) resin.

[Formula 1]

The poly 1,4-cyclohexylenedimethylene terephthalate (PCT) resin is a polymer resin having a chemical structure as shown in Formula 1, and when formed into fibers with low shrinkage and excellent high heat deformation resistance. It has excellent hydrolysis resistance, high resistance to various organic solvents, and excellent heat resistance to the extent that continuous use is possible at 200 ° C or higher.

In addition, it has a low moisture content and does not have a large melting point difference with the polyphenylene sulfide resin used as the sheath part, so it is advantageous in spinning and cross-section formation, and has excellent stretching processability because it has a similar crystallization temperature to that of the polyphenylene sulfide resin.

The poly 1,4-cyclohexylenedimethylene terephthalate (PCT) resin has an intrinsic viscosity of 0.60 to 0.80 dl/g to improve spinning processability and strength of the composite multifilament produced. It would be preferable to use methylene terephthalate (PCT) resin.

Preferably, the sheath part and the core part are formed in an area ratio of 7:3 to 3:7.

When the cross-sectional area of the core portion exceeds 70%, eccentricity of the core portion on one side of the fiber occurs or a phenomenon in which the core portion protrudes to the surface of the fiber during the spinning process (or post-process) occurs, resulting in heat resistance and Chemical resistance may be lowered, and if the cross-sectional area of the core part is less than 30%, it is difficult for the core part to be positioned on the central axis of the fiber during spinning, and accordingly, spinning processability and manufacturing cost reduction effect may be reduced.

The polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament can adjust the fineness and number of filaments according to the purpose of use, but for manufacturing processability, the fineness of 250 to 700 denier and the number of filaments It would be preferable to form 70 to 200 pieces.

In addition, if the single yarn fineness of the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament is less than 2 denier, the spinning and drawing processability may be deteriorated, so the single yarn fineness of the polyphenylene sulfide composite multifilament It will be preferable that is 2 denier or more.

As described above, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention is a spinning step, a cooling step, a first winding step, a drawing step, a shrinking step, It is possible to manufacture composite multifilament including a second winding step, and as shown in FIG. 1, the first process of manufacturing undrawn yarn (POY) through a spinning step, a cooling step, and a first winding step, a drawing step, and a shrinking step. , It will be possible to improve the manufacturing processability and physical properties of the conjugated multifilament by manufacturing it in a two-step process of the second process of manufacturing the undrawn yarn into the drawn yarn (FDY) through the secondary winding step.

The first process is a process of manufacturing undrawn yarn (POY) through a spinning step, a cooling step, and a first winding step. In the spinning step, the sheath part is polyphenylene sulfide resin, and the core part is poly1,4 -This is a step of fiberizing by composite spinning in sheath-core form using Poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin, and using a general composite spinning device, the spinning temperature is about 270 ~ 350 ℃ will be able to radiate

The cooling step is a step of cooling the spun composite multifilament at 20 to 25 ° C. The cooling temperature is a step from the outlet to the first winding step, and the temperature in the cooling step is 20 to 20 to increase the crystallization of the polyphenylene sulfide resin. 25°C would be preferred.

In the cooling step, if the cooling temperature is too low or exceeds 25° C., the crystallinity of the spun composite multifilament may be lowered, resulting in deterioration in spinning processability and physical properties of the composite multifilament.

The first winding step is a step of manufacturing an undrawn yarn by winding the cooled composite multifilament at 1000 to 2500 m/min.

If the winding speed of the first winding step is too low, the elongation rate is too low, and a trimming phenomenon may occur in the subsequent second process, resulting in a decrease in fairness. If the winding speed is too fast, the elongation rate in the first process is too high and the cooling step The physical properties of the composite multifilament may deteriorate because cooling is not smooth in the

The second process is a process of manufacturing undrawn yarn into drawn yarn (FDY) through a drawing step, a shrinking step, and a secondary winding step, and is performed through a plurality of rollers.

In the second process, for example, as shown in FIG. 2, the roller 100 on which unstretched yarn is wound, the stretching rollers 210 and 230 for stretching, the contraction roller 250 for contraction by giving an opioid, and the take-up roller 300 for winding can be carried out.

The drawing step is a step of drawing the wound unstretched yarn using two or more rollers, and it is preferable to draw at a speed of 300 to 600 m/min to suppress thread breakage during drawing.

In the drawing step, the processability of the composite multifilament can be improved by controlling the drawing temperature, and it is preferable that the temperature of the first drawing roller is 70 to 100 ° C and the temperature of the last drawing roller is 150 to 250 ° C.

That is, when manufacturing with the apparatus as shown in FIG. 2, it is preferable that the temperature of the first elongation roller 210 is 70 to 100° C. and the temperature of the last elongation roller 230 is 150 to 250° C.

If the drawing temperature is too high when the unstretched yarn is started to be drawn, the crystallinity of the polyphenylene sulfide resin rapidly progresses and the orientation ratio is lowered during drawing, which may lower the strength of the composite multifilament. I would say it is a very important factor.

The first elongation roller 210 in the elongation step begins elongation in a low temperature state, and the elongation roller 230, which is the last elongation finish, gives a heat treatment effect to the composite multifilament elongated at a high temperature of 150 to 250 ° C. to increase strength. can be maintained

In the stretching step, the stretching ratio may be adjusted in consideration of the stretching ratio in the first step, but if the stretching ratio is too large, the stretching processability may be deteriorated, so it is preferable to stretch the film by about 2.0 to 4.0 times.

The shrinking step is a step of shrinking the stretched composite multifilament at an overfeed of 0.95 to less than 1.0, and is a step performed between the last drawing roller and the next roller in the drawing step. That is, in FIG. 2, it is a step between the last elongation roller 230 and the shrinking roller 250.

The shrinking step is a step performed continuously with the stretching step, and the last stretching roller relaxes the composite multifilament in a high-temperature state with an overfeed of 0.95 to less than 1.0 to induce contraction of the composite multifilament.

Through the shrinking step, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament of the present invention has a low dry heat shrinkage rate.

The second winding step is a winding step of winding the contracted composite multifilament.

Polyphenylene sulfide and poly1,4-cyclohexyl according to the present invention produced by the first process of spinning as described above to prepare undrawn yarn (POY) and the second process of producing undrawn yarn into drawn yarn (FDY) Cylenedimethylene terephthalate composite multifilament is polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate with excellent physical properties due to high manufacturing processability through controlling the cooling temperature in the cooling step and the stretching temperature in the drawing step. A composite multifilament can be produced.

The polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament of the present invention can be used in the form of long fibers rather than short fibers, and has high heat resistance and chemical resistance, so that battery separators, dust collector filters, It can be used in various fields such as industrial fields such as automobile interior materials, industrial protective clothing, protective clothing fields of protective gloves, and interior fields of curtains, sofas, and bedding.

Hereinafter, the present invention will be explained through examples. The following examples are only for a more accurate understanding of the present invention, but do not limit the protection scope of the present invention.

Example 1, 2

Polyphenylene sulfide resin with a melt flow index of 80g/10min is used as the sheath part and poly1,4-cyclohexylenedimethylene terephthalate resin with an intrinsic viscosity of 0.7dl/g is used as the core part, and the spinning temperature is 290℃. After spinning, it was cooled and first wound at a speed of 2,000 m/min to prepare unstretched yarn.

The prepared unstretched yarn was drawn at a draw ratio of 3 times using the same device as in FIG. 2, a contraction step was performed with an overfeed of 0.91, and a second winding was performed to make 530D/144F polyphenylene sulfide and poly1,4-cyclohexylene. A dimethylene terephthalate composite multifilament was prepared.

Table 1 shows the intrinsic viscosity of the core part, the cross-sectional area ratio of the sheath part to the core part, the cooling temperature, and the drawing roller temperature of the above examples.

Comparative Examples 1 and 2

Spinning using polyphenylene sulfide resin having a melt flow index of 80 g/10 min as the sheath part and polyethylene terephthalate resin having intrinsic viscosity of 0.8 dl/g (Comparative Example 1) and 0.6 dl/g (Comparative Example 2) as the core part. After composite spinning at 290 ° C., cooling was performed, and unstretched yarn was prepared by first winding at a speed of 2,000 m/min.

The prepared unstretched yarn was drawn at twice the draw ratio using the same device as in FIG. 2, and a contraction step was performed at an overfeed of 0.90, and a second winding was performed to prepare 530D/144F polyphenylene sulfide and polyethylene terephthalate composite multifilaments. did

Table 1 shows the intrinsic viscosity of the core part, the cross-sectional area ratio of the sheath part to the core part, the cooling temperature, and the drawing roller temperature of the comparative examples.

◈ Evaluation of composite multifilament

The stretching processability, shrinkage rate, section abnormality rate, and strength retention rate after heat resistance and alkali resistance tests of the composite multifilaments of Examples 1 and 2 and Comparative Examples 1 and 2 were measured, and are shown in Table 1.

* Melt flow index: The amount of flow of the resin was measured for 10 minutes by the ASTM D1238 method under the condition of 300 ℃ and 2.16 kgf load.

* Strength: measured according to the KS K 0860 method

* Stretching fairness evaluation: Grade 1 production / Total production * 100 = Yield (by weight)

* Shrinkage rate: Change in length before and after 30 minutes of treatment in a dry heat hot air dryer at 190℃

* Section abnormality rate: Ratio of defective (insufficient center-shaped S/C formation) Fila numbers out of total Fila numbers

* Chemical resistance evaluation: Tensile strength was evaluated before and after treatment at 90 ° C for 72 hours in a 0.25 g / L Ca (OH) ₂ solution.

* Heat resistance evaluation: Tensile strength was evaluated before and after 24 hr treatment in a hot air oven at 200 ° C.

* Strength retention rate: [strength before heat resistance (alkali resistance) treatment - strength after treatment] / strength before heat resistance (alkali resistance) treatment * 100 (%)

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 profit sheath PPS PPS PPS PPS Core part (intrinsic viscosity) PCT(0.7) PCT(0.7) PET(0.8) PET(0.6) Sheath part: core part (weight ratio) 50:50 40:60 50:50 50:50 Cooling stage temperature (℃) 25 25 25 25 Temperature with first drawing roll (℃) 90 90 80 80 Final drawing roller temperature (℃) 180 180 200 200 Radiation fairness (%) 96 98 98 83 Stretching fairness (%) 97 97 95 53 Strength (g/d) 4.4 4.51 4.49 4.23 Section abnormality rate (%) less than 1% less than 1% 2.5 3 190℃ dry heat shrinkage (%) 1.97 2.13 5.12 4.87 Strength retention rate (%) Alkali resistance (CaOH ₂ ) 98.7 98.1 90.6 89.6 Heat resistance (200℃) 97.8 97.0 87.5 71.4

As shown in Table 1, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilaments of Examples 1 and 2 prepared under the manufacturing conditions of the present invention had a lower section abnormality than those of Comparative Examples 1 and 2. As a result, it can be seen that cross-section formation is more advantageous than polyphenylene sulfide and polyethylene terephthalate composite multifilament.

In addition, in terms of dry heat shrinkage, Examples 1 and 2 were lower than Comparative Examples 1 and 2, indicating that the thermal deformation resistance was excellent.

In addition, it can be seen that the heat resistance and alkali resistance are improved because the strength retention rate after the heat resistance and alkali resistance test is greater in Examples 1 and 2 than in Comparative Examples 1 and 2.

Claims (7)

In the sheath-core type polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament formed of a sheath portion and a core portion,
The sheath part is formed of polyphenylene sulfide resin,
Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate, characterized in that the core part is formed of poly1,4-cyclohexylenedimethylene terephthalate (Poly1,4-Cyclohexylenedimethylene Terephthalate, PCT) resin Composite multifilament. According to claim 1,
Polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that the sheath portion and the core portion are formed in an area ratio of 7: 3 to 3: 7. According to claim 1,
The composite multifilament is a polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that the fineness of 250 to 700 denier, the number of filaments is 70 to 200, and the single yarn fineness is 2 denier or more. In the sheath-core type composite multifilament manufacturing method formed of the sheath part and the core part,
The sheath part uses Polyphenylene sulfide resin and the core part uses Poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin to composite-spin in a sheath-core form. radiation step;
A cooling step of cooling the spun composite multifilament at 20 to 25 ° C;
A first winding step of manufacturing an undrawn yarn by winding the cooled composite multifilament at 1000 to 2500 m/min;
A drawing step of drawing the wound unstretched yarn at a speed of 300 to 600 m/min using two or more rollers;
A shrinking step of shrinking the stretched composite multifilament at an overfeed of 0.95 to less than 1.0; and,
Polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method comprising a second winding step of winding the contracted composite multifilament. According to claim 4,
Polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that the temperature of the first elongation roller in the elongation step is 70 ~ 100 ℃ and the temperature of the last elongation roller is 150 ~ 250 ℃ manufacturing method. According to claim 4,
Method for producing polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that in the stretching step, stretching at a stretching ratio of 2.0 to 4.0 times. According to claim 4,
Polyphenylene sulfide and poly 1,4-cyclohexylenedimethylene terephthalate composite multifilament manufacturing method, characterized in that the shrinking step is carried out between the last drawing roller and the next roller of the drawing step.

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