A multifunctional special-shaped composite nylon 6 fully drawn yarn fiber and its preparation method

Abstract

The present invention discloses a multifunctional, special-shaped composite nylon 6 fully drawn yarn fiber. The preparation method comprises the following steps: alkali-soluble polyester masterbatch and nylon 6 chips are mixed by a batching machine and fed into a screw extruder. The mixture is melted, mixed, metered, and extruded under high temperature conditions; the extruded melt is fed into a melt metering pump through a bend in a spinning manifold to form a thin stream of melt, which is then ejected through a spinneret. During the tow ejection process, a monomer suction device is used to extract the nylon 6 monomer. The tow is cooled by a side-blowing device and then oiled to obtain a spun tow. The spinneret has a "W"-shaped cross-section, with both ends of the three vertical holes of the spinneret being arc-shaped. The nylon 6 fiber of the present invention has a "W"-shaped cross-section, and the middle portion of the fiber is relatively wide and thick, exhibiting a distinctly expanded shape. The fiber produced by the present invention has multifunctional composite properties, such as excellent UV resistance, a cool feel, moisture absorption and quick drying, and breathable and dry feel, to the fabric sample produced.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical fibers, and in particular relates to a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber and a preparation method thereof. Background Art

[0002] With the rapid development of the textile industry and the increasing diversification of consumer demands, the demand for fiber materials' functionality and form is increasing. Nylon fiber, a synthetic fiber, has unique properties that offer broad application prospects in outdoor and casual apparel. Especially during outdoor activities, where people need to protect their skin from the sun while maintaining comfort, the demand for multifunctional, composite textiles and apparel that combine sun protection, cooling comfort, and breathability continues to grow. Therefore, developing a nylon 6 fiber that combines these multiple functions has become a pressing concern for industry researchers.

[0003] Chinese patent application number CN201510200793.6 discloses a method for producing nylon 6 shaped fibers, using nylon 6 chips as raw materials. The production method includes the following steps: (1) drying the nylon 6 chips and screw extruding; (2) the melt is then fed into a spinning assembly via a metering pump, filtered through a mixture of filter sands of varying coarseness and fineness, and finally extruded through a spinneret on a spinneret; wherein the spinneret cross-section is cross-shaped, and the length of the "vertical" in the cross-section is equal to half the length of the "horizontal" in the cross; (3) the filaments extruded from the spinneret are cooled by annular air blowing and then bundled and oiled; (4) the oiled filaments are shaped by a hot roller and then wound into shape by a network nozzle. The nylon 6 shaped fibers produced by the method provided by the invention have a cross-shaped cross-section and four distinct grooves on the outer contour of the fiber. The enhanced capillary effect enables the fiber to quickly absorb moisture and sweat from the skin surface, thereby having a strong moisture conduction and perspiration removal ability, but its performance is single and other properties are not covered in detail. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber and a preparation method thereof, which cleverly combines multiple functional components and special-shaped cross-section design, while retaining the original excellent properties of nylon 6 fiber, also giving it the development and professional application of multiple composite functional properties, realizing the integration of multiple technologies. The high-performance fiber produced in this way has the characteristics of low cost and high added value, which can improve the market competitiveness of the product.

[0005] The technical solutions of the present invention are as follows:

[0006] One of the purposes of the present invention is to provide a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn, comprising the following steps:

[0007] S1: Alkali-soluble polyester masterbatch and nylon 6 chips are mixed evenly in a batching machine and fed into a screw extruder. They are melted, mixed, metered and extruded under high temperature conditions.

[0008] S2: The extruded melt is fed into a melt metering pump through a bend in the spinning manifold to form a thin melt stream, which is then ejected through the spinneret holes on the spinneret. During the tow ejection process, a monomer suction device is used to suck the nylon 6 monomer. The tow is cooled by a side blowing device and then oiled to obtain a spun tow. The shape of the spinneret hole is similar to a "W" shape, and both ends of the three vertical holes of the "W" shape spinneret are arc-shaped.

[0009] S3: The functional moisture-absorbing nascent yarn tow enters the pre-network device and then enters the drafting component for stretching and high-temperature shaping, and then is wound into a yarn roll by a winding device to obtain the multifunctional special-shaped composite nylon 6 fully drawn yarn fiber.

[0010] Furthermore, in step S1, the mass ratio of the alkali-soluble polyester masterbatch to the nylon 6 chips is (5-15): (85-95).

[0011] Furthermore, in step S1, the alkali-soluble polyester masterbatch has a relative viscosity of 1.0-1.5, a melting point of 230-240° C., and a water content of ≤500 ppm.

[0012] Furthermore, in step S1, the relative viscosity of the nylon 6 chips is 2.44-2.47, the melting point is 220-225° C., and the water content is ≤500 ppm.

[0013] Furthermore, in step S1, the processing temperature of the screw extruder is: the temperature of zone 1 is 245-252°C, the temperature of zone 2 is 251-256°C, the temperature of zone 3 is 255-261°C, the temperature of zone 4 is 261-266°C, and the temperature of zone 5 is 265-270°C. The screw extruder adopts biphenyl insulation, the temperature of the biphenyl insulation is 250-266°C, and the reduction ratio of the melt metering pump is 45-60.

[0014] Furthermore, in step S2, the side blowing temperature of the side blowing device is 17-24°C, the wind speed is 0.3-0.65m / s, and the relative humidity is 65-75%.

[0015] Furthermore, in step S2, the oiling agent model is 6352AY, the concentration is 8-12%, and the oiling amount of the tow is 1.2-1.6%.

[0016] Furthermore, in step S3, the pre-networking air pressure of the pre-networking device is 1.60-1.70 bar; the stretching ratio of the stretching process is 1.2-1.6; during the high-temperature setting, the temperature of the hot roller is 160-170°C; the main network air pressure of the main network device is 2.60-2.65 bar; and the winding speed of the winding device is 4100-4500 m / min.

[0017] The second object of the present invention is to provide a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber, the cross section of the multifunctional special-shaped composite nylon 6 fully drawn yarn fiber is "K-shaped", and the middle part of the fiber is relatively wide and thick, showing an obvious expansion shape.

[0018] Furthermore, the multifunctional special-shaped composite nylon 6 fully drawn yarn is prepared by any of the above-mentioned preparation methods.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber, which uses alkali-soluble polyester masterbatch and nylon 6 chips as raw materials and adopts an alkali reduction process to match them. The obtained yarn has gully pores, which can improve its moisture absorption and perspiration wicking properties.

[0021] 2. The present invention provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn. During the spinning process, the spinneret of the special spinning assembly has a "W-shaped" special-shaped cross-section. At the moment the melt is extruded through the "W-shaped" spinneret, due to the extremely large force and the influence of thermal expansion and contraction, the radius of the middle vertical hole of the actual cross-section of the extruded fiber is larger than the radius of the vertical holes on both sides. The protrusion of the middle position of the cross-section of the extruded fiber monofilament is greater than that on both sides, so that the special-shaped fiber monofilament has grooves of different heights on both sides. Then, the special-shaped yarn spun from the fiber cannot fit together perfectly, and the grooves have an arc-shaped structure, so the pore size of the yarn deviates. If the same D number of fibers are produced, the yarn spun from the shaped composite fiber monofilament will be relatively thicker, and the increased number of pores will result in better air permeability, thereby improving the anti-ultraviolet performance of the yarn while also enhancing its moisture absorption and quick-drying effect; at the same time, the structure of the fiber monofilament forms an arc-shaped groove structure, so that the entire shaped fiber monofilament is in an arc shape, and light will be diffusely reflected on the surface of the fiber without generating bright spots. Moreover, since there are no sharp edges and corners, the wear of the components is less affected during the spinning or downstream weaving process; in addition, since the cross-section of the shaped fiber monofilament is in a multi-faceted arc shape, the surface area of ​​the fiber is larger than that of ordinary circular, ordinary flat straight, cross or triangular shaped fibers. When the yarn spun from the shaped fiber is woven into a fabric that contacts human skin, the increase in contact area accelerates the thermal conductivity, thereby increasing the cool feeling at the moment of contact.

[0022] 3. The present invention provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn. Due to the difference in melting points between alkali-soluble polyester and nylon, in order to ensure normal spinning conditions and the spinnability of the fiber, the temperature is controlled in a step-by-step, graded and zoned manner during the blending process to reduce possible problems such as uneven yarn length in the produced fiber, which may affect the downstream weaving process.

[0023] 4. The present invention provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber, which uses nylon 6 masterbatch and alkali-soluble polyester chips to increase the "wicking" effect of the fiber by ensuring the special shape of the fiber. The prepared fiber has a grooved phenomenon. At the same time, the alkali reduction method is used in the subsequent dyeing and finishing process to control the alkali concentration at 5%-20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a multifunctional special-shaped composite nylon 6 fully drawn yarn provided by the present invention;

[0025] Figure 2 It is a structural schematic diagram of the "W-shaped" spinneret in the present invention. DETAILED DESCRIPTION

[0026] Below in conjunction with preferred embodiment, and referring to attached Figure 1 , to further illustrate the present invention, the endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values; for numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein; the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial channels; the experimental methods in the following examples, unless otherwise specified, are all conventional methods.

[0027] Example 1

[0028] This embodiment provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn with a specification of 50D / 48F, comprising the following steps:

[0029] S1: Alkali-soluble polyester masterbatch and nylon 6 chips in a mass ratio of 5:95 are fully mixed by a batching machine and fed into a screw extruder. The mixture is melted, mixed, metered and extruded under high temperature conditions. The relative viscosity of the alkali-soluble polyester masterbatch is 1.25, the melting point is 235°C, and the water content is ≤500ppm; the relative viscosity of the nylon 6 chips is 2.45, the melting point is 222°C, and the water content is ≤500ppm.

[0030] In this embodiment, the five zone temperatures of the screw extruder are 248°C, 252°C, 259°C, 262°C, and 266°C, respectively. The screw extruder adopts biphenyl insulation, the biphenyl insulation temperature is 260°C, and the reduction ratio of the melt metering pump is 45;

[0031] S2: The extruded melt is fed into the melt metering pump through the bend of the spinning box to form a melt stream, which is then ejected through the spinneret holes on the spinneret. During the tow ejection process, the monomer suction device is used to suck the nylon 6 monomer. The tow is cooled by the side blowing device and then oiled to obtain a nascent tow. The cross section of the spinneret holes on the spinneret is "W-shaped", and both ends of the three vertical holes of the "W-shaped" spinneret holes are arc-shaped, such as Figure 2 As shown, in this embodiment, the total length of the spinneret holes is 5.7 mm, the distance between the vertical holes is 2.4 mm, the length of the vertical holes is 2.1 mm, and the width of the transverse holes is 0.7 mm.

[0032] In this embodiment, the side blowing temperature of the side blowing device is 17°C, the wind speed is 0.3m / s, the relative humidity is 65%, the oiling agent model is 6352AY, the concentration is 8%, and the oiling amount of the tow is 1.2%;

[0033] S3: After the functional moisture-absorbing初生 filament bundle enters the pre-networker, it enters the drafting assembly for stretching and high-temperature setting, and then is wound into a filament roll by the winding device to obtain the multifunctional profiled composite polyamide 6 fully drawn yarn fiber. The structural schematic diagram is as shown in Figure 1 shown. The cross-section of the multifunctional profiled composite polyamide 6 fully drawn yarn fiber is in the shape of a "king character", and the middle part of the fiber is relatively thick and wide, showing an obvious swelling state.

[0034] In this embodiment, the pre-network air pressure of the pre-networker is 1.62 bar; the draw ratio in the stretching process is 1.2; in the high-temperature setting, the temperature of the hot roller is 162 °C; the main network air pressure of the main networker is 2.61 bar; the winding speed of the winding device is 4130 m / min.

[0035] Example 2

[0036] This embodiment provides a method for preparing a multifunctional profiled composite polyamide 6 fully drawn yarn fiber with a specification of 70D / 48F, including the following steps:

[0037] S1: Mix the alkali-soluble polyester masterbatch and polyamide 6 chips with a mass ratio of 10:90 through a batching machine, and put them into a screw extruder. After melting, mixing, metering and extruding the melt under high-temperature conditions;

[0038] Among them, the relative viscosity of the alkali-soluble polyester masterbatch is 1.0, the melting point is 230 °C, and the water content ≤ 500 ppm; the relative viscosity of the polyamide 6 chips is 2.44, the melting point is 220 °C, and the water content ≤ 500 ppm;

[0039] In this embodiment, the five-zone temperatures of the screw extruder are 249 °C, 253 °C, 260 °C, 263 °C, and 266 °C respectively. The screw extruder uses diphenyl insulation, the temperature of the diphenyl insulation is 245 °C, and the reduction ratio of the melt metering pump is 50;

[0040] S2: The extruded melt is sent into the melt metering pump through the bend of the spinning box to form a melt stream, and then is ejected through the spinneret holes on the spinneret. During the spraying of the filament bundle, a monomer suction device is used to suck the polyamide 6 monomer. After the filament bundle is cooled by the side blowing device, it is oiled to obtain the初生 filament bundle; the cross-section of the spinneret hole is in the shape of a "king character", and both ends of the three vertical holes of the "king character" spinneret hole are arc-shaped;

[0041] In this embodiment, the side blowing temperature of the side blowing device is 20 °C, the wind speed is 0.5 m / s, the relative humidity is 70%, the oil agent model for oiling is 6352AY, the concentration is 10%, and the oil content on the filament bundle is 1.4%;

[0042] S3: The functional moisture-absorbing primary filaments enter the pre-network device and then enter the drafting assembly for stretching and high-temperature shaping, and then are rolled into a yarn roll by the winding device to obtain the multifunctional special-shaped composite nylon 6 fully drawn yarn fiber. In this embodiment, the cross-section of the obtained multifunctional special-shaped composite nylon 6 fully drawn yarn fiber is "K-shaped", and the middle part of the fiber is relatively wide and thick, showing an obvious expansion shape.

[0043] In this embodiment, the pre-network air pressure of the pre-network device is 1.63 bar; the stretching ratio of the stretching process is 1.3; during the high-temperature setting, the temperature of the hot roller is 163°C; the main network air pressure of the main network device is 2.63 bar; and the winding speed of the winding device is 4200 m / min.

[0044] Example 3

[0045] This embodiment provides a method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn fiber, wherein the fully drawn yarn has a specification of 140D / 48F, comprising the following steps:

[0046] S1: Alkali-soluble polyester masterbatch and nylon 6 chips in a mass ratio of 15:85 are mixed by a batching machine and fed into a screw extruder. The mixture is melted, mixed, metered and extruded under high temperature conditions. The relative viscosity of the alkali-soluble polyester masterbatch is 1.5, the melting point is 240°C, and the water content is ≤500ppm; the relative viscosity of the nylon 6 chips is 2.47, the melting point is 225°C, and the water content is ≤500ppm.

[0047] In this embodiment, the five zone temperatures of the screw extruder are 250°C, 254°C, 260°C, 264°C, and 266°C, respectively. The screw extruder is insulated with biphenyl, the temperature of the biphenyl insulation is 250°C, and the reduction ratio of the melt metering pump is 60;

[0048] S2: The extruded melt is fed into a melt metering pump through a bend in the spinning manifold to form a melt stream, which is then ejected through the spinneret holes on the spinneret. During the tow ejection process, a monomer suction device is used to suck the nylon 6 monomer. The tow is cooled by a side blowing device and then oiled to obtain a spun tow. The cross-section of the spinneret hole is "W"-shaped, and both ends of the three vertical holes of the "W"-shaped spinneret are arc-shaped.

[0049] In this embodiment, the side blowing temperature of the side blowing device is 24°C, the wind speed is 0.65m / s, the relative humidity is 75%, the oiling agent model is 6352AY, the concentration is 12%, and the oiling amount of the tow is 1.6%;

[0050] S3: The functional moisture-absorbing primary filaments enter the pre-network device and then enter the drafting assembly for stretching and high-temperature shaping, and then are rolled into a yarn roll by the winding device to obtain the multifunctional special-shaped composite nylon 6 fully drawn yarn fiber. In this embodiment, the cross-section of the obtained multifunctional special-shaped composite nylon 6 fully drawn yarn fiber is "K-shaped", and the middle part of the fiber is relatively wide and thick, showing an obvious expansion shape.

[0051] In this embodiment, the pre-network air pressure of the pre-network device is 1.64 bar; the stretching ratio of the stretching process is 1.6; during the high-temperature setting, the temperature of the hot roller is 166°C; the main network air pressure of the main network device is 2.65 bar; and the winding speed of the winding device is 4430 m / min.

[0052] Comparative Example 1

[0053] The difference from Example 1 is that:

[0054] In step 1 of this comparative example, alkali-soluble polyester masterbatch and nylon 6 chips with a mass ratio of 0:100 were mixed by a batching machine and fed into a screw extruder.

[0055] Comparative Example 2

[0056] The difference from Example 1 is that:

[0057] In step S2 of this comparative example, the spinneret holes used are in a straight line shape.

[0058] Comparative Example 3

[0059] The difference from Example 1 is that:

[0060] In step S2 of this comparative example, the spinneret used has circular spinneret holes.

[0061] Implementation effect evaluation

[0062] The excellent effects achieved by the present invention are further illustrated by conducting specific tests on the nylon 6 fibers and fabrics woven from Examples 1-3 and Comparative Examples 1-3, respectively.

[0063] The physical property test results are shown in the table below:

[0064] Table 1 Statistics of physical properties

[0065]

[0066] Cooling performance test: According to the relevant standards of GB / T 35263-2017, a heat detection plate with a temperature higher than the specified temperature difference of the sample is brought into contact with the sample with a certain pressure. The maximum heat flux density during the heat transfer process after the heat detection plate contacts the sample is used to measure the contact cooling coefficient of the fabric;

[0067] UV resistance test: According to the relevant standards of GB / T18830-2019, the ratio of the average effect of ultraviolet radiation calculated when the skin is unprotected to the average effect of ultraviolet radiation calculated when the skin is protected by fabric is UPF;

[0068] Moisture permeability (g / m 2 24h) Test: Water vapor transmission rate test is conducted according to the relevant standards of GB / T12704.1-2009;

[0069] Evaporation rate test: According to the relevant standards of GB / T 21655.1-2008, a certain amount of water is dropped on the fabric, and then hung in a standard atmosphere to evaporate naturally. The evaporation mass per unit time in the linear interval of the time-evaporation curve is calculated;

[0070] Moisture absorption and quick-drying test: According to the relevant standards of GB / T 21655.2-2008, the fabric is tested and multiple data are measured, such as the soaking time and level, water absorption rate and level, maximum soaking radius of the penetration surface, etc., to judge whether the moisture absorption and quick-drying performance of the fabric meets the standards in multiple dimensions.

[0071] Table 2 Test results statistics

[0072]

[0073] As can be seen from the above table, in the cooling performance test results of the fabrics woven from nylon 6 fibers prepared in Examples 1-3, the contact cooling coefficients are 0.25-0.29, all greater than 0.15, indicating that the fabrics woven from the fibers of the present invention have a cooling feeling upon contact; from the anti-ultraviolet performance test results, it can be seen that the anti-ultraviolet values ​​UPF of the fabrics of Examples 1-3 are greater than 50. It can be seen from the experimental data of Example 1 and Comparative Examples 1-3 that the fibers prepared by the present invention can greatly improve the anti-ultraviolet performance of the woven fabrics; from the data of Examples 1-3 and Comparative Examples 1-3, it can be seen that the perspective rates of Examples 1-3 are all greater than 10,000, indicating that the fabrics woven from the fibers of the present invention have good perspective performance; from the evaporation rate test results of Examples 1-3, it can be seen that the test data are all greater than 0.18, indicating that the fabrics woven from the fibers of the present invention have good evaporation performance; from the moisture absorption and quick-drying test data of Example 1 and Comparative Examples 1-3, it can be seen that the present invention can improve the moisture absorption and quick-drying properties and moisture absorption and perspiration properties of the fibers.

[0074] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn, characterized in that: It includes the following steps: S1: Uniformly mix the alkali-soluble polyester masterbatch and nylon 6 chips in a sufficient proportion by a batching machine, and feed them into a screw extruder. After melting, mixing, metering, and extruding the melt under high-temperature conditions; S2: The extruded melt is sent into a melt metering pump through the bend of the spinning box body to form a melt streamlet, and then is ejected through the spinneret holes on the spinneret plate. During the process of ejecting the fiber bundle, a monomer suction device is used to suck the nylon 6 monomer. After the fiber bundle is cooled by a side blowing device, it is oiled to obtain a functional moisture-absorbing nascent fiber bundle; the shape of the spinneret holes is similar to the Chinese character "王" (king), and both ends of the three vertical holes of the spinneret holes similar to the Chinese character "王" are arc-shaped; S3: The functional moisture-absorbing nascent fiber bundle enters a pre-networker for interlacing, then enters a main networker and then enters a drafting assembly for stretching and high-temperature setting, and then is wound into a silk roll by a winding device to obtain the multifunctional profiled composite nylon 6 fully drawn yarn fiber.

2. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S1, the mass ratio of the alkali-soluble polyester masterbatch to the nylon 6 chips is (5-15):(85-95).

3. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S1, the relative viscosity of the alkali-soluble polyester masterbatch is 1.0-1.5, the melting point is 230-240 °C, and the water content ≤ 500 ppm.

4. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S1, the relative viscosity of the nylon 6 chips is 2.44-2.47, the melting point is 220-225 °C, and the water content ≤ 500 ppm.

5. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S1, the processing temperature of the screw extruder: the temperature of zone 1 is 245-252 °C, the temperature of zone 2 is 251-256 °C, the temperature of zone 3 is 255-261 °C, the temperature of zone 4 is 261-266 °C, the temperature of zone 5 is 265-270 °C. The screw extruder adopts diphenyl heat preservation, the temperature of the diphenyl heat preservation is 250-266 °C, and the reduction ratio of the melt metering pump is 45-60.

6. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S2, the side blowing temperature of the side blowing device is 17-24 °C, the wind speed is 0.3-0.65 m / s, and the relative humidity is 65-75%.

7. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S2, the type of the oil agent for oiling is 6352AY, the concentration is 8-12%, and the oil content on the fiber bundle is 1.2-1.6%.

8. The method for preparing a multifunctional special-shaped composite nylon 6 fully drawn yarn according to claim 1, characterized in that: In step S3, the pre-network air pressure of the pre-networker is 1.60-1.70 bar; the draw ratio in the stretching process is 1.2-1.6; in the high-temperature setting, the temperature of the hot roll is 160-170 °C; the main network air pressure of the main networker is 2.60-2.65 bar; the winding speed of the winding device is 4100-4500 m / min.

9. A multifunctional special-shaped composite nylon 6 fully drawn yarn, characterized in that: The multifunctional profiled composite nylon 6 fully drawn yarn fiber is prepared according to the preparation method described in any one of claims 1-8; the cross-section of the multifunctional profiled composite nylon 6 fully drawn yarn fiber is similar to the Chinese character "王" (king), and the middle part of the fiber is relatively thick and wide, showing an obvious swelling shape.

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