KR102632326B1 - Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate conjugate multi filament, and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a sheath-core type polyphenylene sulfide composite multifilament formed of a sheath portion and a core portion, wherein the sheath portion is formed of polyphenylene sulfide resin, and the core portion has an intrinsic viscosity of 0.80 to 1.20. It relates to a polyphenylene sulfide composite multifilament, characterized in that it is formed of a polyester resin with a dl/g ratio, and a method for producing the same.

Description

Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament and method for manufacturing the same

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

Polyphenylene sulfide fiber has a variety of markets, including the industrial fields of battery separators, dust collector filters, and automobile interior materials, as well as the interior field of wallpaper, curtains, sofas, and bedding, and the protective clothing field of industrial protective clothing and protective gloves. Recently, as the demand for chemical resistance and flame retardant functions increases, its use is increasing.

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

Meanwhile, polyphenylene sulfide fiber is 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 injecting the melt into a plurality of cans; And, it can be manufactured through the step of stretching the filament bundles in these multiple cans in multiple stages.

However, these polyphenylene sulfide fibers have disadvantages such as the high polymer price and poor crimp development in the cutting and stretching process due to poor solidification during the spinning process, so the yield cannot be improved by improving the processability of PPS fibers. There is a need for existing technology.

As a technology to improve the processability of polyphenylene sulfide fiber, German patent DE 4006397 relates to a technology for manufacturing polyphenylene sulfide multifilament by applying high-temperature air or inert gas under the spinneret and then going through a stretching process. , Japanese Patent Laid-Open No. 1991-168750, which relates to a technique of blowing airflow above 45°C into spun polyphenylene sulfide fibers to cool them and then passing them through a heated area to heat-stretch them, and polyphenylene sulfide resins of 310 to 310 degrees Celsius. Multifilaments are manufactured by melting them at a temperature of 340°C and continuously spinning them through holes with a spinneret diameter of 0.1 to 0.5mm, passing them through a high-temperature atmosphere sealed by an insulating tube or heating tube, and then heating them at 100°C. There is Japanese Patent Laid-Open No. 1990-219475 regarding the technology of cooling by the following warm air or cold air.

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 gases, and polyphenylene sulfide fibers manufactured including polyphenylene sulfide and acrylic fibers. There is PCT-US2007-019827 regarding phenylene sulfide bag filters.

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

Due to the spinning defects described above, most polyphenylene sulfide fibers are composites that use polyphenylene sulfide resin in the sheath part for spinning properties, and polyester resin, polyamide resin, and polyolefin resin in the core part. After being manufactured as a fiber, it is cut to a certain length to make single fibers, which are then used to make spun yarn.

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

In order to solve the above problems, Korean Patent No. 2183246 proposes a composite multifilament using a high-viscosity polyester resin in the core part and polyphenylene sulfide resin in the sheath part, but the polyester resin in the core part is used. There was a problem with low heat and hydrolysis resistance compared to multifilament formed only from polyphenylene sulfide resin.

The present invention was invented to solve the problems of the prior art as described above. Polyphenylene sulfide has excellent hydrolysis resistance without the addition of a hydrolysis agent and has a low heat shrinkage rate, so that it can be used as a composite multifilament rather than a single fiber. And the purpose is to provide poly1,4-cyclohexylenedimethylene terephthalate composite multifilament.

In addition, poly1,4-cyclohexylenedimethylene terephthalate composite multifilament is cut to a certain length and used as a long fiber instead of as a single fiber, so that polyphenylene sulfide and poly1,4- have excellent heat and chemical resistance. The purpose is to provide cyclohexylenedimethylene terephthalate composite multifilament.

In addition, polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate have excellent physical properties by improving the spinning and stretchability of composite multifilament. The purpose is to provide a manufacturing method for manufacturing composite multifilaments.

In order to solve the above problems, the present invention provides a cis-core type polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament formed of a cis portion and a core portion, wherein the cis portion is poly Polyphenylene sulfide, characterized in that it is formed of polyphenylene sulfide resin, and the core portion is formed of poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin, and Provided is poly1,4-cyclohexylenedimethylene terephthalate composite multifilament.

In addition, it provides a composite multifilament of polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate, wherein the sheath portion and the core portion are formed in an area ratio of 7:3 to 3:7.

In addition, the composite multifilament is a polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that the fineness is 250 to 700 denier and 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 relates to a method for manufacturing a sheath-core type composite multifilament formed of a sheath portion and a core portion, wherein the sheath portion is polyphenylene sulfide resin and the core portion is poly1,4-cyclohexylenedi. A spinning step of composite spinning into a cis-core shape using methylene terephthalate (Poly1,4-Cyclohexylenedimethylene Terephthalate, PCT) resin; A cooling step of cooling the spun composite multifilament at 20-25°C; A first winding step of manufacturing undrawn yarn by winding the cooled composite multifilament at 1000 to 2500 m/min; A stretching step of stretching the wound undrawn yarn at a speed of 300 to 600 m/min using two or more rollers; A shrinking step of shrinking the stretched composite multifilament to an overfeed of 0.95 to less than 1.0; and a secondary winding step of winding the shrunken composite multifilament. A method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament is provided.

In addition, the temperature of the first stretching roller in the stretching step is 70 to 100 ℃ and the temperature of the last stretching roller is 150 to 250 ℃. Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite. Provides a multifilament manufacturing method.

In addition, a method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament is provided, which is characterized in that the stretching step is stretched at a stretching ratio of 2.0 to 4.0 times.

The shrinking step provides a method for producing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that it is carried out between the last stretching roller of the stretching step and the next roller.

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 portion and poly1,4-cyclohexylene in the core portion. Because dimethylene terephthalate is used, it has excellent radioactivity 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 long fibers rather than single fibers, resulting in excellent heat resistance and chemical resistance. there is.

In addition, the method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament of the present invention has excellent processability by optimizing the spinning and stretching steps.

Figure 1 is a diagram showing a process diagram of a method for producing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention.
Figure 2 is a diagram briefly showing the second process of the method for producing 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 drawings attached to the present invention. First of all, it should be noted that among the drawings, identical components or parts are indicated by the same reference numerals whenever possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order to not obscure the gist of the present invention.

As used herein, the terms 'about', 'substantially', etc. are used to mean at or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used to enhance the understanding of the present invention. Precise or absolute figures are used to assist in preventing unscrupulous infringers from taking unfair advantage of stated disclosures.

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

The present invention relates to a cis-core type polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament formed of a cis portion and a core portion.

When the polyphenylene sulfide resin is spun alone into fiber, problems such as cutting problems due to poor solidification and poor crimp development during the stretching process may occur. Therefore, the present invention uses poly1,4-cyclohexane in the core part. It is a composite multifilament of polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate using silenedimethylene terephthalate resin.

Polyphenylene sulfide resin forming the sheath portion is a crystalline engineering plastic with 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 uses include electrical and electronic parts, automobile parts, and mechanical parts.

In addition, polyphenylene sulfide resin can be a linear, cross-linked, or semi-cross-linked polymer, but 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 can be used, and a melt flow index of 30 to 100 g/10 min is preferable.

In addition, in order to use the mechanical and chemical durability of polyphenylene sulfide, which is a characteristic of polyphenylene sulfide, black coloring is required to use it as an automobile interior material, and a dyeing method that adds a colorant at the stage before the spinning process must be used to maintain color fastness. can be excellent. The dyeing process is preferably used mainly to express basic colors such as black, navy blue, and brown.

The core part may use poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin.

[Formula 1]

The poly1,4-cyclohexylenedimethylene terephthalate (PCT) resin is a polymer resin having the same chemical structure as Formula 1 above. It has a low shrinkage rate and excellent high heat deformation resistance when formed into a fiber. It has excellent hydrolysis resistance, high resistance to various organic solvents, and has excellent heat resistance to the extent that it can be used continuously at over 200℃.

In addition, it has a low moisture content and does not have a large difference in melting point from the polyphenylene sulfide resin used as a sheath, making it advantageous for spinnability and cross-section formation. It has a similar crystallization temperature to polyphenylene sulfide resin, so it has excellent stretching processability.

The poly1,4-cyclohexylenedimethylene terephthalate (PCT) resin is poly1,4-cyclohexylenedi having 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 desirable to use methylene terephthalate (PCT) resin.

It is preferable that the sheath portion and the core portion be formed in an area ratio of 7:3 to 3:7.

If the cross-sectional area of the core portion exceeds 70%, eccentricity of the core portion toward one side on the fiber occurs, or a phenomenon in which the core portion protrudes onto the fiber surface during the spinning process (or post-process) occurs, thereby reducing the heat resistance of the fiber and Chemical resistance may be reduced, 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 spinning processability and manufacturing cost reduction may be reduced accordingly.

The fineness and number of filaments of the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament can be adjusted depending on the purpose of use, but for manufacturing fairness, the fineness is 250 to 700 denier and the number of filaments is adjusted. It would be desirable 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, spinning and drawing processability may be reduced, so the single yarn fineness of the polyphenylene sulfide composite multifilament It would be desirable to have 2 denier or more.

As described above, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament according to the present invention includes a spinning step, a cooling step, a primary winding step, a stretching step, a shrinking step, Composite multifilament can be manufactured including a secondary winding step, and as shown in Figure 1, the first process of manufacturing undrawn yarn (POY) through a spinning step, a cooling step, and a first winding step, as well as a stretching step and a shrinking step. , it will be possible to improve the manufacturing process and the physical properties of composite multifilament by manufacturing it in a two-step process of manufacturing undrawn yarn into drawn yarn (FDY) through the second 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. The sheath portion of the spinning step is polyphenylene sulfide resin, and the core portion is poly1,4. -This is the step of composite spinning into fibers in a cis-core form using cyclohexylenedimethylene terephthalate (Poly1,4-Cyclohexylenedimethylene Terephthalate, PCT) resin. Using a general composite spinning device, the spinning temperature is about 270~350℃. It will be possible to radiate.

The cooling step is a step of cooling the spun composite multifilament at 20 to 25°C, and is a step from the discharge port to the first winding step. The cooling temperature is 20 to 20 to increase 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, thereby reducing spinning processability and physical properties of the composite multifilament.

The first winding step is a step of manufacturing 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 thread breakage may occur in the second process, which may reduce fairness. If the winding speed is too fast, the elongation rate in the first process becomes too large and the cooling step may occur. Since cooling is not smooth, the physical properties of composite multifilament may deteriorate.

The second process is a process of manufacturing undrawn yarn into drawn yarn (FDY) through a stretching stage, shrinking stage, and secondary winding stage, and is carried out using a plurality of rollers.

For example, as shown in FIG. 2, the second process includes a roller 100 on which unstretched yarn is wound, drawing rollers 210 and 230 for stretching, a shrinking roller 250 for shrinking by applying an off-feed, and a winding roller 300 for winding. It can be implemented.

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

In order to improve the fairness of composite multifilament by controlling the stretching temperature in the stretching step, it is preferable that the temperature of the first stretching roller is 70 to 100°C and the temperature of the last stretching roller is 150 to 250°C.

That is, when manufacturing with the device shown in FIG. 2, the temperature of the first stretching roller 210 is preferably 70 to 100°C, and the temperature of the last stretching roller 230 is preferably 150 to 250°C.

If the stretching temperature is too high when starting to stretch the unstretched yarn, the crystallinity of the polyphenylene sulfide resin progresses rapidly and the orientation ratio decreases during stretching, which may reduce the strength of the composite multifilament. Therefore, the temperature of the first stretching roller in the stretching step is It would be said to be a very important factor.

In the stretching step, the first stretching roller 210 starts stretching at a low temperature, and the last stretching roller 230, which completes stretching, provides a heat treatment effect to the composite multifilament stretched at a high temperature of 150 to 250 ° C, resulting in increased strength. It can be maintained.

In the stretching step, the stretching ratio can be adjusted in consideration of the stretching rate in the first process. However, if the stretching ratio is too large, stretching processability may deteriorate, so it is preferable to stretch about 2.0 to 4.0 times.

The shrinking step is a step of shrinking the stretched composite multifilament with an overfeed of 0.95 to less than 1.0, and is performed between the last stretching roller of the stretching step and the next roller. That is, in Figure 2, it is the stage between the last stretching roller 230 and the shrinking roller 250.

The shrinking step is performed continuously with the stretching step, and the last stretching roller relaxes the high-temperature composite multifilament to an overfeed of 0.95 to less than 1.0, thereby causing shrinkage of the composite multifilament.

Through the above shrinkage step, the polyphenylene sulfide and poly1,4-cyclohexylenedimethylene te1rephthalate composite multifilament of the present invention has a low dry heat shrinkage rate.

The second winding step is a winding step for winding the shrunken composite multifilament.

Polyphenylene sulfide and poly1,4-cyclohexane according to the present invention are manufactured through a first process of spinning as described above to produce undrawn yarn (POY) and a second process of manufacturing undrawn yarn into drawn yarn (FDY). Silenedimethylene terephthalate composite multifilament is polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate with excellent physical properties through high manufacturing process through control of cooling temperature in the cooling stage and stretching temperature in the stretching stage. Composite multifilaments can be manufactured.

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 single fibers, and has high heat resistance and chemical resistance, such as battery separators, dust collector filters, It can be used in a variety of fields, including industrial fields such as automobile interior materials, industrial protective clothing and protective gloves, and interior design fields such as curtains, sofas, and bedding.

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

Examples 1 and 2

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

The manufactured undrawn yarn was stretched at a draw ratio of 3 times using the same device as shown in Figure 2, and the shrinkage step was performed at an overfeed of 0.91, and the second winding was performed to produce polyphenylene sulfide and poly1,4-cyclohexylene of 530D/144F. Dimethylene terephthalate composite multifilament was prepared.

The intrinsic viscosity of the core portion, the cross-sectional area ratio of the sheath portion and the core portion, cooling temperature, and stretching roller temperature of the above examples are shown in Table 1.

Comparative Examples 1 and 2

Spinning using polyphenylene sulfide resin with a melt flow index of 80 g/10 min as the sheath part and polyethylene terephthalate resin with 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 a temperature of 290°C, it was cooled and first wound at a speed of 2,000 m/min to produce undrawn yarn.

The manufactured undrawn yarn was stretched at twice the draw ratio using the same device as in Figure 2, the shrinkage step was performed at an overfeed of 0.90, and the second winding was performed to produce a 530D/144F polyphenylene sulfide and polyethylene terephthalate composite multifilament. did.

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

◈ Composite multifilament evaluation

The stretching processability, shrinkage rate, cross-sectional 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 resin flow was measured for 10 minutes using ASTM D1238 method at 300℃ and 2.16kgf load.

* Strength: Measured according to KS K 0860 method

* Stretching fairness evaluation: 1st grade production / total production * 100 = yield (by weight)

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

* Cross-sectional abnormality rate: Ratio of the number of defective (insufficiently centered S/C formation) Fila numbers to the total number of Fila

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

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

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

division Example 1 Example 2 Comparative Example 1 Comparative example 2 profit Sis part PPS PPS PPS PPS Core part (intrinsic viscosity) PCT(0.7) PCT(0.7) PET(0.8) PET(0.6) Sheath: Core (weight ratio) 50:50 40:60 50:50 50:50 Cooling stage temperature (℃) 25 25 25 25 First stretching roll temperature (℃) 90 90 80 80 Last stretching 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 rate (%) 1.97 2.13 5.12 4.87 Strength maintenance 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 cross-sectional abnormality rate than Comparative Examples 1 and 2. It can be seen that the cross-sectional formation is more advantageous than that of polyphenylene sulfide and polyethylene terephthalate composite multifilament.

In addition, it can be seen that the dry heat shrinkage rate of Examples 1 and 2 is lower than that of Comparative Examples 1 and 2, showing excellent heat deformation resistance.

In addition, it can be seen that 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, showing that the heat resistance and alkali resistance are improved.

Claims (7)

delete delete delete In the method of manufacturing a sheath-core type composite multifilament formed of a sheath portion and a core portion,
The sheath portion is made of polyphenylene sulfide resin, and the core portion is made of poly1,4-Cyclohexylenedimethylene Terephthalate (PCT) resin with an intrinsic occupancy of 0.60 to 0.80 dl/g. A spinning step of composite spinning into a sheath-core form;
A cooling step of cooling the spun composite multifilament at 20 to 25°C;
A first winding step of manufacturing undrawn yarn by winding the cooled composite multifilament at 1000 to 2500 m/min;
A stretching step of stretching the wound undrawn yarn at a speed of 300 to 600 m/min using two or more rollers;
A shrinking step of shrinking the stretched composite multifilament to an overfeed of 0.95 to less than 1.0; and,
A method for producing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, comprising a secondary winding step of winding the shrunken composite multifilament. According to clause 4,
Polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that the temperature of the first stretching roller in the stretching step is 70 to 100 ℃ and the temperature of the last stretching roller is 150 to 250 ℃. Manufacturing method. According to clause 4,
A method for manufacturing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that stretching at a stretching ratio of 2.0 to 4.0 times in the stretching step. According to clause 4,
The shrinking step is a method for producing polyphenylene sulfide and poly1,4-cyclohexylenedimethylene terephthalate composite multifilament, characterized in that it is carried out between the last stretching roller of the stretching step and the next roller.

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