阅读说明：本技术 一种氨纶包覆丝的生产方法 (Production method of spandex-coated yarn ) 是由 庞秀英 徐卫星 陈红兴 于 2021-08-25 设计创作，主要内容包括：本申请涉及纺丝技术领域,尤其是涉及一种氨纶包覆丝的生产方法。本申请的氨纶包覆丝的生产方法,包括如下步骤：1)将皮丝与芯丝合并,得到合并丝；所述皮丝为锦纶丝或锦纶涤纶合并丝；所述芯丝为氨纶丝；2)将合并丝经喷气粘合,即得；所述喷气粘合时的压力为0.4-0.6MPa。本申请的氨纶包覆丝的生产方法以锦纶丝或锦纶涤轮合并丝为皮丝,以氨纶丝为芯丝,采用较高的气体压力进行喷气粘合,使皮丝和芯丝相互交缠,制得的氨纶包覆丝具有更高的强度。(The application relates to the technical field of spinning, in particular to a production method of spandex-coated yarns. The production method of the spandex-coated yarn comprises the following steps: 1) combining the skin silk and the core silk to obtain combined silk; the leather yarn is nylon yarn or nylon and terylene combined yarn; the core yarn is spandex yarn; 2) bonding the combined yarns by air injection to obtain the yarn; the pressure during the air jet bonding is 0.4-0.6 MPa. According to the production method of the spandex coated yarn, the nylon yarn or the nylon polyester yarn combined yarn is used as the sheath yarn, the spandex yarn is used as the core yarn, air injection adhesion is carried out by adopting higher air pressure, so that the sheath yarn and the core yarn are intertwined with each other, and the prepared spandex coated yarn has higher strength.)

1. A production method of spandex-coated yarns is characterized by comprising the following steps:

1) combining the skin silk and the core silk to obtain combined silk; the leather yarn is nylon yarn or nylon and terylene combined yarn; the core yarn is spandex yarn;

2) bonding the combined yarns by air injection to obtain the yarn; the pressure during the air jet bonding is 0.4-0.6 MPa.

2. The production method of the spandex coated yarn according to claim 1, wherein the nylon and polyester blended yarn is prepared by a method comprising the following steps: the nylon POY yarn and the polyester POY yarn are combined, then deformed, heated, cooled and false twisted.

3. The method for producing spandex-covered yarn as claimed in claim 2, wherein the temperature of the deforming heat treatment is 170-180 ℃.

4. The production method of the spandex coated yarn according to claim 2, wherein the chinlon POY yarn is prepared by a method comprising the following steps:

a) melting and blending nylon slices, a stabilizer and a filler, extruding and granulating to obtain nylon master batches; the mass ratio of the nylon chips to the stabilizer to the filler is 1000:1-2: 30-45;

b) and (3) melting and extruding the nylon master batch, spinning, cooling, oiling and winding.

5. The method for producing the spandex-covered yarn according to claim 4, wherein the filler in the step a) is at least one of calcium stearate and aluminum stearate.

6. The process for producing a covered spandex filament according to claim 5, wherein the filler in the step a) is composed of calcium stearate and aluminum stearate in a mass ratio of 2-3: 1.

7. The method for producing spandex-covered yarn as claimed in claim 4, wherein the temperature at the time of melt extrusion in step b) is 280-290 ℃.

8. The method for producing spandex coated yarn as claimed in claim 7, wherein the melt extrusion in step b) is performed by a screw extruder, and the five-stage temperatures of the screw extruder are respectively 280-282 ℃, 282-283 ℃, 283-285 ℃, 288-289 ℃ and 289-292 ℃.

9. The production method of spandex-covered yarn according to claim 4, characterized in that nano-silicon and aluminum nitride are added during melt blending of nylon chips, stabilizers and fillers in step a), and the mass ratio of nylon chips, nano-silicon and aluminum nitride is 1000:8-10: 3-5.

10. The production method of the spandex-covered yarn according to claim 9, wherein silicone resin is further added during melt blending of the nylon chips, the stabilizer and the filler in step a), and the mass ratio of the nylon chips to the silicone resin is 1000: 2-3; the silicone resin has the following structure:

wherein R is methyl or ethyl, and m and n are positive integers.

Technical Field

The application relates to the technical field of spinning, in particular to a production method of spandex-coated yarns.

Background

The spandex is polyurethane fiber, is elastic fiber, has good elasticity and elastic recovery rate, and also has the characteristics of fine fineness, high strength, small specific gravity, good fatigue resistance, low density, good aging resistance and the like. In order to improve the hand feeling and mechanical property of spandex, spandex is usually made into spandex coated yarns, and the spandex coated yarns are yarns formed by wrapping fiber filaments and the spandex through a network nozzle and spraying and pressing by compressed air and have the characteristics of good elasticity, good comfort and the like.

The Chinese patent with application publication No. CN102767015A discloses a polyester/spandex coated yarn with fragrance, which is prepared by taking polyester slices and additives as raw materials, firstly preparing a fine-denier polyester POY pre-oriented yarn, then taking a naked spandex filament as a core yarn and taking the fine-denier polyester POY pre-oriented yarn as a sheath yarn and adopting an ATY process.

In view of the above-mentioned related technologies, the inventor believes that the spandex-covered yarn is covered with polyester POY yarn, and the strength of the finally-produced spandex-covered yarn still needs to be improved.

Disclosure of Invention

In order to improve the strength of the spandex-coated yarn, the application provides a production method of the spandex-coated yarn.

The production method of the spandex-coated yarn adopts the following technical scheme:

a production method of spandex-coated yarns comprises the following steps:

1) combining the skin silk and the core silk to obtain combined silk; the leather yarn is nylon yarn or nylon and terylene combined yarn; the core yarn is spandex yarn;

2) bonding the combined yarns by air injection to obtain the yarn; the pressure during the air jet bonding is 0.4-0.6 MPa.

By adopting the technical scheme, the nylon yarn or the nylon and terylene combined yarn is combined with the spandex yarn and then subjected to air-jet bonding (air coating), and after high-pressure airflow blowing twisting, the yarns are mutually intertwined to form a periodic network structure, so that the high-strength nylon yarn has high breaking strength. Because the nylon yarn or the nylon and polyester combined yarn is used as the sheath yarn to coat the spandex yarn, the elasticity of the nylon yarn or the combined yarn is slightly lower than that of the spandex yarn, and the uniformity of the length between the opening section and the interlacing section is not easy to control when air jet bonding is adopted. The pressure during the air jet bonding is set to be higher, during the air jet bonding, the nylon yarn or the nylon and polyester combined yarn are easier to bend on the spandex yarn, the distance and the uniformity between sections are easier to control, the cohesive force between the sheath yarn and the core yarn is larger, and the strength of the finally prepared spandex coated yarn is higher.

Preferably, the nylon and polyester blended yarn is prepared by a method comprising the following steps: the nylon POY yarn and the polyester POY yarn are combined, then deformed, heated, cooled and false twisted.

By adopting the technical scheme, the combined nylon and polyester yarn is prepared by combining two yarns, and performing deformation heating treatment and false twisting treatment, so that the polyester yarn can be utilized to improve the hand feeling of the nylon yarn and reduce the moisture regain, the two yarns can be synchronously deformed during the deformation heating treatment, the looseness caused by different yarns can be reduced, the cohesive force between the nylon and the polyester can be greatly improved after the false twisting treatment, and the looseness caused by subsequent air jet bonding treatment between the yarns can be reduced.

Preferably, the temperature during the deformation heating treatment is 180-190 ℃.

By adopting the technical scheme, the temperature setting during deformation heating treatment is higher, so that the chinlon POY yarns and the terylene POY yarns can be well softened, and the deformation efficiency and the deformation uniformity are convenient to improve.

Preferably, the chinlon POY yarn is prepared by a method comprising the following steps:

a) melting and blending nylon slices, a stabilizer and a filler, extruding and granulating to obtain nylon master batches; the mass ratio of the nylon chips to the stabilizer to the filler is 1000:1-2: 30-45;

b) and (3) melting and extruding the nylon master batch, spinning, cooling, oiling and winding.

By adopting the technical scheme, a large amount of filler is added into the melt-blended material during the preparation of the nylon POY yarn, so that the elasticity of the nylon is weakened to a certain degree, but the warping degree of the nylon yarn can be reduced by more filler, and the uniformity of the nylon and polyester blended yarn is further improved. In addition, the filler can also improve the surface state of the nylon, and improve the coloring rate of the nylon and polyester combined yarn and the finally prepared spandex coated yarn.

Preferably, the filler in step a) is at least one of calcium stearate and aluminum stearate.

By adopting the technical scheme, the stearate is selected as the filler, organic groups around the central metal ions in the stearate have good compatibility with groups in other components, the dispersion uniformity of the filler in the nylon material is improved, and the hybrid reinforcement effect of the filler on the nylon is realized.

Preferably, the filler in step a) consists of calcium stearate and aluminum stearate in a mass ratio of 2-3: 1.

Through adopting above-mentioned technical scheme, there are more stearate groups around the aluminium ion in the aluminium stearate, can combine better with other ingredients such as nylon, and then improve the dispersion degree of consistency of filler, adopt calcium stearate and aluminium stearate with above-mentioned proportion cooperation, can also reduce the overall cost of filler.

Preferably, the temperature during melt extrusion in step b) is 280-290 ℃.

Through adopting above-mentioned technical scheme, the temperature when melting is extruded sets up higher, can guarantee the mobility of nylon under the condition that more filler exists, is convenient for evenly extrude.

Preferably, the melt extrusion in step b) is performed by using a screw extruder, and the temperatures of the five sections of the screw extruder are respectively 280-.

By adopting the technical scheme, the temperatures of the five sections of the screw extruder are relatively close, the materials can always keep better fluidity, the melting, mixing, exhausting and other efficiencies are improved, and the components such as the filler in the materials are dispersed in the nylon more uniformly.

Preferably, the nylon chips, the stabilizer and the filler are added during melt blending in the step a), and the mass ratio of the nylon chips, the nano silicon and the aluminum nitride is 1000:8-10: 3-5.

By adopting the technical scheme, when the nylon chips are subjected to melt blending, the nano silicon and the aluminum nitride are added, the nano silicon can supplement the filler effect and further play a role in reinforcing the nylon yarns, the aluminum nitride is added, the adaptability of the nylon yarns to the environmental temperature can be improved, and the nylon yarns can still keep good stability and consistency during subsequent heat treatment.

Preferably, silicone resin is added when the nylon chips, the stabilizer and the filler are melt blended in the step a), and the mass ratio of the nylon chips to the silicone resin is 1000: 2-3; the silicone resin has the following structure:

wherein R is methyl or ethyl, and m and n are positive integers. Preferably, R is methyl and m ═ n.

By adopting the technical scheme, the organic silicon resin is added when the nylon chips are melted and blended, wherein the Si-O-Si bond has good stability, the heat resistance and the radiation resistance of the nylon yarn can be improved, and the nylon yarn can be combined with components such as nylon in materials, so that the strength and the elongation at break of the nylon yarn are greatly improved. When R is methyl, the strength of the nylon yarn is slightly higher than that when R is ethyl. The molecular weight of the silicone resin is 8000-50000, preferably 10000-15000.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the production method of the spandex coated yarn, the nylon yarn or the nylon polyester yarn combined yarn is used as the sheath yarn, the spandex yarn is used as the core yarn, air injection adhesion is carried out by adopting higher air pressure, so that the sheath yarn and the core yarn are intertwined with each other, and the prepared spandex coated yarn has higher strength.

2. According to the production method of the spandex-covered yarns, the spandex yarns are preferably covered by the combined nylon and polyester yarns, and deformation heating treatment is performed after combination, so that looseness between the nylon yarns and the polyester yarns is reduced, and cohesive force between the nylon yarns and the polyester yarns is improved.

Detailed Description

The present application will be described in further detail with reference to examples.

In the production method of spandex-covered yarn, the spandex yarn is preferably 40D or 70D spandex yarn, and is preferably 70D spandex yarn. The polyester POY yarn is commercially available polyester POY yarn with the specification of 75D or 150D, and preferably the specification of the polyester POY yarn is 75D.

The nylon POY yarn is a commercially available nylon POY yarn or a self-made nylon POY yarn, preferably, the commercially available nylon POY yarn is 70D, 100D or 120D nylon yarn, and further preferably, the commercially available nylon yarn is 120D nylon yarn. When the self-made nylon POY yarn is prepared, the nylon slices are nylon 6 slices.

When the chinlon POY yarn is prepared, the stabilizer is N, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide.

Preferably, the filler consists of calcium stearate and aluminum stearate in a mass ratio of 2: 1. The particle size of the nano silicon is preferably 5 nm.

When the nylon POY yarn is prepared, the nylon chips are dried before melt blending, and the drying is carried out by adopting hot air drying at 80-90 ℃ for 18-24 h. Preferably, the drying is carried out by hot air drying at 85 ℃ for 20 h. The pump supply of the nylon chips was 80 g/min.

The five sections of the screw extruder are respectively a conveying section, a melting section, a mixing section, a gas exhaust section and a homogenizing section, and the temperature of the five zones of the screw extruder is preferably 282 ℃, 283 ℃, 285 ℃, 289 ℃ and 291 ℃. During preparation, the rotating speed of the screw is 35r/min, and the pressure of the screw is 100kg/cm²。

When the nylon POY yarn is prepared, spinning and cooling are carried out, wherein the cooling comprises circular air blowing cooling and side air blowing cooling, the temperature of circular air blowing is 30-35 ℃, and the temperature of side air blowing is 20-25 ℃. When winding is carried out after cooling and oiling, the winding speed is 3700 and 4300 m/min.

When the nylon and polyester blended yarn is prepared, deformation heating treatment is carried out in a deformation heat box. The speed of the false twister during false twisting is 6000 r/min. The speed of the first roller is 500-600 m/min. The speed of the second roller is 550-650 m/min.

Preparation example 1 of Nylon POY yarn

The preparation example of the chinlon POY yarn is prepared by the following steps:

a) drying the nylon slices with hot air at 85 ℃ for 20h, then melting and blending the dried nylon slices, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and calcium stearate according to the mass ratio of 1000:2:35, extruding and granulating to obtain nylon master batches;

b) adding the nylon master batch prepared in the step a) into a screw extruder, and carrying out melt blending and extrusion, wherein the temperatures of five regions of the screw extruder are respectively 280 ℃, 282 ℃, 283 ℃, 288 ℃ and 289 ℃; pumping the mixture into a spinning assembly through a metering pump, filtering, spinning, cooling through circular air blowing and side air blowing, wherein the temperature of the circular air blowing is 35 ℃, and the temperature of the side air blowing is 25 ℃;

c) oiling the cooled yarn, and then winding at the winding speed of 3700m/min to obtain the nylon POY yarn.

Preparation example 2 of Nylon POY yarn

The preparation example of the chinlon POY yarn is prepared by the following steps:

a) drying the nylon slices for 24 hours by using hot air at the temperature of 80 ℃, then melting and blending the dried nylon slices, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and calcium stearate according to the mass ratio of 1000:2:35, extruding and granulating to obtain nylon master batches;

b) adding the nylon master batch prepared in the step a) into a screw extruder, and carrying out melt blending and extrusion, wherein the temperatures of five regions of the screw extruder are respectively 280 ℃, 282 ℃, 283 ℃, 288 ℃ and 289 ℃; pumping into a spinning assembly through a metering pump, filtering, spinning, cooling through circular air blowing and side air blowing, wherein the temperature of the circular air blowing is 30 ℃, and the temperature of the side air blowing is 20 ℃;

c) and oiling the cooled yarn, and then winding at the winding speed of 4000m/min to obtain the nylon POY yarn.

Preparation example 3 of Nylon POY yarn

The preparation example of the chinlon POY yarn is prepared by the following steps:

a) drying the nylon slices for 18h by using hot air at 90 ℃, and then melting and blending the dried nylon slices, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and calcium stearate according to the mass ratio of 1000:2:35, extruding and granulating to obtain nylon master batches;

b) adding the nylon master batch prepared in the step a) into a screw extruder, and carrying out melt blending and extrusion, wherein the temperatures of five regions of the screw extruder are respectively 280 ℃, 282 ℃, 283 ℃, 288 ℃ and 289 ℃; pumping the mixture into a spinning assembly through a metering pump, filtering, spinning, cooling through circular air blowing and side air blowing, wherein the temperature of the circular air blowing is 35 ℃, and the temperature of the side air blowing is 22 ℃;

c) oiling the cooled yarn, and then winding at the winding speed of 4300m/min to obtain the nylon POY yarn.

Preparation example 4 of Nylon POY yarn

This preparation example differs from the above preparation example 1 in that the mass ratio of nylon chips, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide and calcium stearate in step a) was 1000:1:38, and the others were the same as in preparation example 1.

Preparation example 5 of Nylon POY yarn

This preparation example differs from the above preparation example 1 in that the mass ratio of nylon chips, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide and calcium stearate in step a) was 1000:1.5:45, and the others were the same as in preparation example 1.

Preparation example 6 of Nylon POY yarn

The present preparation example is different from the above preparation example 5 in that the nylon mother particles prepared in the step b) are added into a screw extruder, melt-blended, extruded, and the temperatures of five zones of the screw extruder are 282 ℃, 283 ℃, 285 ℃, 289 ℃, 291 ℃, and the others are the same as those of the preparation example 5.

Preparation example 7 of Nylon POY yarn

The present production example is different from the above production example 6 in that, in the step a), the nylon chips were dried with hot air at 85 ℃ for 20 hours, and then the dried nylon chips, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide, calcium stearate, and aluminum stearate were melt-blended at a mass ratio of 1000:1.5:30:15, extruded, and granulated to obtain nylon master batches, and the others were the same as in the production example 6.

Preparation example 8 of Nylon POY yarn

The preparation example is different from the preparation example 7 in that in the step a), the nylon chip is dried for 20 hours by using hot air at 85 ℃, then the dried nylon chip, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic amide, calcium stearate, aluminum stearate, nano silicon and aluminum nitride are melted and blended according to the mass ratio of 1000:1.5:30:15:10:5, extruded and granulated to prepare the nylon master batch, and the rest is the same as that in the preparation example 7.

Preparation example 9 of Nylon POY yarn

This production example is different from the above production example 8 in that the mass ratio of the dried nylon chips, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide, calcium stearate, aluminum stearate, nano-silicon, and aluminum nitride in step a) is 1000:1.5:30:15:8:3, and the others are the same as in production example 8.

Preparation example 10 of Nylon POY yarn

The difference between the preparation example and the preparation example 9 is that in the step a), the nylon chip is dried for 20 hours by using hot air at 85 ℃, and then the dried nylon chip, the N, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide, the calcium stearate, the aluminum stearate, the nano silicon, the aluminum nitride and the organic silicon resin are melted and blended according to the mass ratio of 1000:1.5:30:15:8:3:2.5, extruded and granulated to prepare the nylon master batch, and the rest is the same as that in the preparation example 9. The structure of the silicone resin is shown as follows:

wherein m and n are positive integers, and m is equal to n, and the molecular weight of the organic silicon resin is 12000.

Example 1

The production method of the spandex-covered yarn comprises the following steps:

1) introducing the chinlon POY yarns and the spandex yarns into a false twist texturing machine by taking the chinlon POY yarns as sheath yarns and the spandex yarns as core yarns, and winding and combining the chinlon POY yarns and the spandex yarns through a winding and combining roller to obtain combined yarns; the speed of the winding and merging roller is 500 m/min; the nylon POY yarn is the nylon POY yarn in the preparation example 1 of the nylon POY yarn;

2) sending the combined yarn prepared in the step 1) into a network nozzle for air injection bonding, wherein the gas pressure of the network nozzle is 0.4 MPa; and then winding and forming are carried out, thus obtaining the product.

Example 2

The production method of the spandex-covered yarn comprises the following steps:

1) introducing the chinlon POY yarns and the terylene POY yarns to a false twist texturing machine, and then winding and combining the chinlon POY yarns and the terylene POY yarns through a first roller; the speed of the first roller is 500m/min, and the nylon POY yarn is the nylon POY yarn in the preparation example 1 of the nylon POY yarn; then carrying out deformation heating treatment, cooling and false twisting to obtain the polyamide and polyester blended yarn; the temperature during deformation heating treatment is 180 ℃;

2) taking the polyamide and polyester blended yarns prepared in the step 1) as skin yarns and taking the spandex yarns as core yarns, introducing the polyamide and polyester blended yarns prepared in the step 1) and the spandex yarns into a false twist texturing machine, and winding and combining the yarns through a second roller to obtain blended yarns; the speed of the winding and merging roller is 550 m/min;

3) sending the combined yarn prepared in the step 2) into a network nozzle for air injection bonding, wherein the gas pressure of the network nozzle is 0.4 MPa; and then winding and forming are carried out, thus obtaining the product.

Example 3

The production method of the spandex-covered yarn comprises the following steps:

1) introducing the chinlon POY yarns and the terylene POY yarns to a false twist texturing machine, and then winding and combining the chinlon POY yarns and the terylene POY yarns through a first roller; the speed of the first roller is 600m/min, and the nylon POY yarn is the nylon POY yarn in the preparation example 1 of the nylon POY yarn; then carrying out deformation heating treatment, cooling and false twisting to obtain the polyamide and polyester blended yarn; the temperature during deformation heating treatment is 190 ℃;

2) taking the polyamide and polyester blended yarns prepared in the step 1) as skin yarns and taking the spandex yarns as core yarns, introducing the polyamide and polyester blended yarns prepared in the step 1) and the spandex yarns into a false twist texturing machine, and winding and combining the yarns through a second roller to obtain blended yarns; the speed of the winding and merging roller is 650 m/min;

3) sending the combined yarn prepared in the step 2) into a network nozzle for air injection bonding, wherein the gas pressure of the network nozzle is 0.4 MPa; and then winding and forming are carried out, thus obtaining the product.

Example 4

The production method of the spandex-covered yarn of this example differs from example 3 in that the gas pressure of the network nozzle in step 3) was 0.6MPa, and the rest was the same as in example 3.

The production method of the spandex-covered yarn of the embodiments 5 to 13 is different from that of the embodiment 4 in that in the step 1), the nylon POY yarns are respectively the nylon POY yarns of the preparation examples 2 to 10 of the nylon POY yarns, and the rest are the same as those in the embodiment 4.

Comparative example 1

The difference between the production method of the spandex-coated yarn in this comparative example and example 1 is that in preparation example 1 of the nylon POY yarn, the mass ratio of the nylon chips, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide, and calcium stearate was 1000:2:15, and the others were the same as in example 1.

Comparative example 2

The difference between the production method of the spandex coated yarn in this comparative example and example 1 is that in preparation example 1 of the nylon POY yarn, nylon master batch is added into a screw extruder to be melt-blended and extruded, and the temperatures of five zones of the screw extruder are 275 ℃, 278 ℃, 282 ℃, 285 ℃ and 289 ℃, respectively, and the others are the same as those in example 1.

Performance test

Taking the spandex coated yarns prepared in the examples 1-13 and the comparative examples 1-2, and testing the mechanical properties of the spandex coated yarns according to a method in GB/T14344-2008 'test method for tensile properties of chemical fiber filaments'; the spandex-covered yarn prepared in examples 1 to 13 and comparative examples 1 to 2 was dyed using a dye solution prepared from a commercially available red solvent dye, and the dyeing degree was measured according to GB/T23976.1-2009 "dyeing degree determination". The test results are shown in the following table.

TABLE 1 Properties of spandex-covered yarn obtained in examples 1-13 and comparative examples 1-2

According to the example 1 and the comparative example 1, and the content in the table above, it can be known that the breaking strength of the spandex coated yarn prepared by the spandex coated yarn production method of the present application is high, which may be related to the large amount of the filler added in the preparation of the nylon POY yarn used in the example 1 of the present application.

According to the embodiment 1 and the comparative example 2, and by combining the content in the table, it can be known that the temperature of the nylon masterbatch during melt extrusion is set to be more optimized in a segmented manner during the preparation of the nylon POY yarn, and the finally prepared spandex-coated yarn has high breaking strength and high elongation at break.

According to the embodiment 1 and the embodiment 2, and the contents in the above table, it can be known that, when the spandex filament is coated by the combined polyamide and polyester filament, the breaking strength and the breaking elongation of the obtained spandex filament are both greatly improved, and the coloring rate of the finally obtained spandex filament is also improved to a certain extent.