CN115573048A - A production process for melt direct spinning fine denier PET with high gloss - Google Patents

Abstract

The present invention provides a production process for producing melt direct spinning fine denier PET, including PET melt conveying, color paste conveying, entering the spinning box, FDY spinning and FDY finishing. Among them, the spinning temperature of melt direct spinning fine denier PET is 295°C, and the cooling method adopts ring blowing, and the ring blowing temperature is 21°C, the ring blowing humidity is 90%RH, the ring blowing process wind pressure is 40Pa, and the ring blowing speed is 0.35 m/s, the product can be produced continuously and stably, the product quality is stable, and all indicators have reached the top grade.

Description

A production process for melt direct spinning fine denier PET with high gloss

technical field

The invention relates to the technical field of fully drawn polyester yarns, in particular to a production process for producing melt direct spinning fine denier PET large gloss fully drawn yarns.

Background technique

As one of the synthetic fiber varieties, polyester has large output, wide application and simple process, accounting for more than 60% of the world's synthetic fiber production. It has excellent physical and mechanical properties and textile properties, cheap, durable, good elasticity, not easy to wrinkle and deform, corrosion-resistant, crisp insulation, easy to wash and quick-dry, and is widely used in four-season clothing, bedding, interior decoration, national defense and military industry and other industries.

In recent years, with the development of the global economy, changes in consumption concepts, and the emergence of new fiber products, new processes, and new technologies, people's pursuit of four-season clothing has become more and more personalized and high-end. As the most widely used chemical fiber variety among all textile fibers, polyester product differentiation is its ultimate development direction, and it has great development potential and broad market. The development of differentiated polyester varieties, increasing the added value of products, and then improving the economic benefits of enterprises are of great importance to the entire chemical fiber industry. The woven imitation silk fabrics and warp knitted fabrics made of fine denier polyester bright full-drawn yarn (FDY) are soft and smooth, and are often used to make outdoor sportswear, high-end women's clothing in spring and summer, Underwear, high-end clothing and home textile products.

Fine-denier polyester is very glossy. Taking 40D/48F FDY as an example, the preparation process of the prior art has the following defects: the traditional fine-denier fully drawn yarn is easy to appear when it passes through the ring blowing due to the low tension of the fiber itself. Jitter problem, if traditional process parameters are used to produce, it is prone to melt fracture, poor spinnability, and problems such as hard ends.

The patent document with the application number 201310577811.3 discloses the production of POY and FDY composite polyester yarn system and its preparation method by melt direct spinning stock solution, in which the PET melt tower is connected with the melt cooler, and the color paste silo and melt cooler are respectively It is connected with the multi-component coupler, the multi-component coupler is connected with the dynamic mixer, the dynamic mixer is connected with the spinning box, and the spinning box is connected with the POY device and the FDY device respectively, so as to obtain the melt direct spinning stock solution to produce POY, FDY composite polyester yarn system, the system has compact structure, shorter production process, easier operation, higher production efficiency, less energy consumption loss, more stable quality, reduced pollutant discharge, and ecological protection. However, its main production process parameters for the production system are not clear enough, and further regulation is required

In view of this, it is necessary to invent a production process for producing melt direct spinning fine denier PET with high gloss.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to provide a production process for producing melt direct-spun fine denier PET with high gloss.

The technical solution adopted by the present invention to solve its technical problems is:

The invention discloses a preparation method for producing melt direct spinning fine denier PET large glossy production process, comprising the following steps:

Step (1), PET melt delivery

The PET melt produced by the polyester reaction in the PET melt tower is transported to the booster pump through the discharge pump and the insulation pipeline, and the PET melt is boosted by the booster pump and transported to the melt cooler for cooling. to the spinning line;

Step (2), color paste delivery

Add the color paste into the color paste silo, the color paste enters the multi-coupler through the color paste silo, the PET melt and the color paste are coupled through the multi-element coupler, after coupling, they are mixed by a static mixer, and then mixed by a static mixer Realize uniform disperse dyeing of polyester melt;

Step (3), enter the spinning box

The melt evenly dyed by the static mixer enters the spinning box, and the spinning box is connected with the spinning assembly of FDY;

Step (4), FDY spinning

After step (3), through the spinneret in the spinning box, fully-drawn filaments are formed. After the fully-drawn filaments are separated by the ring blowing cooling device, they come out through the tunnel and enter the oil nozzle clustering device for oiling. , and then enter the pre-netting device, carry out preliminary networking through the pre-netting nozzle, and then fully stretch under the action of the first godet and the second godet, enter the main network network, and then enter the winding machine for coiling and forming , get FDY silk cake;

Among them, the fuel injectors of the fuel injector cluster device are V-shaped;

The spinning temperature in the spinning box is 295-297°C;

The wind speed in the ring blowing cooling device is 0.25-0.55m/s, the wind pressure is 20-60Pa, the wind temperature is 17-23°C, and the humidity is 65-100%RH;

The air pressure of the main network is 0.2-0.3MPa, and the network degree of the main network is controlled at 20-30 pieces/m.

Step (5), FDY sorting and storage

The above-mentioned FDY spinning is subjected to color judgment, appearance inspection, and physical inspection of stocking tubes, and then the qualified products are graded and packaged, and finally the packaged products are put into the finished product three-dimensional warehouse.

On the basis of the above scheme and as a preferred scheme of the above scheme, the intrinsic viscosity of the PET melt in step (1) is 0.635-0.645dL g, the melting point is 258-262°C, the b value is 2.0-6.30, and the L value For 85-90.

On the basis of the above solution and as a preferred solution of the above solution, the output end of the discharge pump described in step (1) is provided with a melt filter.

On the basis of the above scheme and as a preferred scheme of the above scheme, an accurate metering device for color paste is provided between the color paste silo and the multi-coupler in step (2), and the output end of the static mixer described in step (2) is provided There are melt distribution valves.

On the basis of the above-mentioned scheme and as a preferred scheme of the above-mentioned scheme, the first wire godet and the second wire godet described in step (4) are in a dislocation distribution up and down, and the second godet is located at the first wire guide top of the plate.

On the basis of the above scheme and as a preferred scheme of the above scheme, the temperature of the first godet is 90-100°C, and the speed is 1750-1950m/min; the temperature of the second godet is 130-140 ℃, the speed is 4750-4950m/min.

On the basis of the above solution and as a preferred solution of the above solution, the winding speed of the winding machine in step (4) is 4600-5000m/min.

Compared with the prior art, the technical solution of the present invention has obtained the following beneficial effects:

After many times of optimization of the production process and parameters, compared with the traditional fine denier full-drawn yarn, the melt direct spinning fine denier PET Dayouguang produced by the present invention is less likely to shake when it passes through the ring blowing. And the spinnability is good, and there are no problems such as melt fracture and hard ends. After many times of optimization of the production process and parameters, the variety has achieved continuous and stable production, and the product quality indicators have reached the top grade.

It should be understood that all combinations of the foregoing concepts as well as additional concepts described in more detail below may be considered part of the present subject disclosure, provided such concepts are not mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description. Other additional aspects of the invention, such as the features and/or advantages of the exemplary embodiments, will be apparent from the description below, or learned by practice of specific embodiments in accordance with the teachings of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a structural diagram of the present invention;

Fig. 2 is a process flow diagram of the present invention.

Among them, 1. PET melt tower; 2. Discharge pump; 3. Insulation pipeline; 4. Booster pump; 5. Melt conveying cooler; 6. Melt cooler; 7. Multi-component coupler; Slurry warehouse; 9. Accurate metering device for color paste; 10. Static mixer; 11. Melt distribution valve; 12. Spinning box; 13. Ring air cooling device; 14. Oil nozzle cluster oiling device; 15 1. Pre-network device; 16. First godet; 17. Second godet; 18. Main network; 19. Winding machine.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

"First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Also, unless the context clearly dictates otherwise, the singular forms "a", "an" or "the" and similar words do not imply a limitation of number but rather mean that there is at least one. "comprises" or "comprises" and similar words mean that the elements or items presented before "comprises" or "comprises" include the features, integers, steps, operations, elements and/or items listed after "comprises" or "comprises" or component, does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or collections thereof. "Up", "Down", "Left" and "Right" are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

As a high value-added textile raw material, the light fabric woven from fine denier polyester has excellent soft and smooth feel, soft luster, good air permeability and drape, and has a unique style. By controlling and optimizing the corresponding production process parameters, the present invention produces PET-FDY products (taking 40D/48F as an example) of fine denier polyester with stable quality and excellent performance (taking 40D/48F as an example), increasing the diversity and differentiation rate of enterprise products, Improve the market competitiveness of enterprises. A detailed description will be given below with reference to examples.

Example 1

The present embodiment produces the preparation method of melt direct spinning fine denier PET big bright production process, comprises the following steps:

(1), PET melt conveying

The PET melt produced by the polyester reaction in the PET melt tower is transported to the booster pump through the discharge pump and the insulation pipeline, and the PET melt is boosted by the booster pump and transported to the melt cooler for cooling. to the spinning line; wherein the PET melt has an intrinsic viscosity of 0.640dL·g, a melting point of 260°C, a b value of 4.0, and an L value of 88;

(2), color paste delivery

Add the color paste into the color paste silo, the color paste enters the multi-coupler through the color paste silo, the PET melt and the color paste are coupled through the multi-element coupler, after coupling, they are mixed by a static mixer, and then mixed by a static mixer Realize uniform disperse dyeing of polyester melt;

(3), enter the spinning box

The melt evenly dyed by the static mixer enters the spinning box, and the spinning box is connected with the spinning assembly of FDY;

(4), FDY spinning

After step (3), through the spinneret in the spinning box, fully-drawn filaments are formed. After the fully-drawn filaments are separated by the ring blowing cooling device, they come out through the tunnel and enter the oil nozzle clustering device for oiling. , and then enter the pre-netting device, carry out preliminary networking through the pre-netting nozzle, and then fully stretch under the action of the first godet and the second godet, enter the main network network, and then enter the winding machine for coiling and forming , get FDY silk cake;

Wherein, the spinning temperature in the spinning box is 295°C; the wind speed in the ring blowing cooling device is 0.35m/s, the wind pressure is 40Pa, the wind temperature is 21°C, and the humidity is 90%RH; The temperature is 295°C, and the cooling method adopts ring blowing; the oiling rate of the filaments is controlled at 0.8%; the air pressure of the main network is 0.2 MPa, and the network degree of the main network is controlled at 25 pieces/m.

Step (5), FDY sorting and storage

The above-mentioned FDY spinning is subjected to color judgment, appearance inspection, and physical inspection of stocking tubes, and then the qualified products are graded and packaged, and finally the packaged products are put into the finished product three-dimensional warehouse.

Further, the temperature of the first godet is 95°C and the speed is 1850m/min; the temperature of the second godet is 135°C and the speed is 4850m/min; the winding machine described in step (4) The winding speed is 4800m/min.

Example 2

The present embodiment produces the preparation method of melt direct spinning fine denier PET big bright production process, comprises the following steps:

(1), PET melt conveying

The PET melt produced by the polyester reaction in the PET melt tower is transported to the booster pump through the discharge pump and the insulation pipeline, and the PET melt is boosted by the booster pump and transported to the melt cooler for cooling. to the spinning line; wherein the PET melt has an intrinsic viscosity of 0.645dL·g, a melting point of 261°C, a b value of 5.0, and an L value of 88;

(2), color paste delivery

Add the color paste into the color paste silo, the color paste enters the multi-coupler through the color paste silo, the PET melt and the color paste are coupled through the multi-element coupler, after coupling, they are mixed by a static mixer, and then mixed by a static mixer Realize uniform disperse dyeing of polyester melt;

(3), enter the spinning box

The melt evenly dyed by the static mixer enters the spinning box, and the spinning box is connected with the spinning assembly of FDY;

(4), FDY spinning

After step (3), through the spinneret in the spinning box, fully-drawn filaments are formed. After the fully-drawn filaments are separated by the ring blowing cooling device, they come out through the tunnel and enter the oil nozzle clustering device for oiling. , and then enter the pre-netting device, carry out preliminary networking through the pre-netting nozzle, and then fully stretch under the action of the first godet and the second godet, enter the main network network, and then enter the winding machine for coiling and forming , get FDY silk cake;

Wherein, the spinning temperature in the spinning box is 296°C; the wind speed in the ring blowing cooling device is 0.30m/s, the wind pressure is 50Pa, the wind temperature is 22°C, and the humidity is 95%RH; The temperature is 296°C, the cooling method adopts ring blowing, and the oiling rate of the filaments is controlled at 0.7%; the air pressure of the main network is 0.3 MPa, and the network degree of the main network is controlled at 30 pieces/m.

Step (5), FDY sorting and storage

The above-mentioned FDY spinning is subjected to color judgment, appearance inspection, and physical inspection of stocking tubes, and then the qualified products are graded and packaged, and finally the packaged products are put into the finished product three-dimensional warehouse.

Further, the temperature of the first godet is 93°C and the speed is 1950m/min; the temperature of the second godet is 135°C and the speed is 4950m/min; the winding machine described in step (4) The winding speed is 4900m/min.

Comparative example 1

The commercially available FDY of fine denier polyester Dayouguang 40D/48F is randomly selected for performance testing.

Performance Testing:

(1) Linear density

According to GB/T 14343-2008 "Test Method for Linear Density of Chemical Fiber Filament", test the linear density of the sample.

(2) Strength test

According to GB/T 14344-2008 "Test Method for Tensile Properties of Chemical Fiber Filament", the samples were tested for properties such as breaking strength and elongation at break.

(3) Evenness unevenness

According to GB/T 14346-2015 "Chemical Fiber Filament Filament Yarn Irregularity Test Method Capacitance Method", the sample is tested for evenness unevenness.

(4) Heat shrinkage performance test

According to GB/T 6505-2017 "Test method for heat shrinkage rate of chemical fiber filament (after treatment)", the heat shrinkage performance test was carried out on the sample.

(5) Dyeing uniformity

According to GB/T 6508-2015 "Test Method for Dyeing Uniformity of Polyester Filament", the heat shrinkage performance test was carried out on the sample.

According to the relevant performance testing standards, sampling, taking the samples of the above-mentioned examples 1-2 and comparative examples, and then performing performance tests such as linear density, strength, unevenness, heat shrinkage and dyeing uniformity, and their physical properties are compared in the following table Show:

Combining the data analysis in the above table and the research on the process of polyester FDY 40D/48F series, the following optimal production process parameters are obtained:

1) The spinning temperature is 295°C, the cooling method adopts ring blowing, the cooling conditions: the ring blowing temperature is 21°C, the ring blowing humidity is 90%RH, the ring blowing process wind pressure is 40Pa, the ring blowing speed is 0.35m/s; the filaments are oiled The rate is controlled at 0.7-0.9%.

2) After multiple process adjustments, the temperatures of the first and second hot rollers are 95°C and 135°C, the speeds of the first and second hot rollers are 1850m/min and 4850m/min; the draw ratio is 2.2 to 2.8 times, and the fine Denier polyester bright 40D/48F FDY yarn is usually controlled at 20-30 pieces/m under the air pressure of 0.2-0.3MPa; the winding speed is selected to be about 4800m/min.

Based on the parameter adjustment of Examples 1-2 of the present invention, it can be known that the influencing factors affecting the continuous and stable production of fine denier polyester with high gloss, stable product quality and excellent quality include: spinning temperature, cooling molding parameters, oiling amount, temperature of hot roller , stretching ratio, main network pressure and winding speed.

Spinning temperature

In the melt direct spinning production process, the spinning temperature is the most important process condition, and its selection is very important. Whether the spinning temperature is properly selected will directly affect the quality of the fiber and the normal spinning. At a suitable spinning temperature, the melt uniformity and rheology are good, the spinnability is good, and the produced product is stable. If the spinning temperature is too high, the thermal decomposition will intensify, the molecular weight will decrease, the content of low molecular substances will increase, and the melt viscosity will decrease; The performance becomes worse, and the quality index of the finished silk produced is reduced, which seriously affects the fiber quality. On the contrary, if the spinning temperature is too low, the viscosity of the melt will be too high, the uniformity and fluidity of the melt will be deteriorated, the delivery burden of the pump will be increased, and the energy consumption will increase uneconomically; the outlet of the melt extruded from the spinning assembly will expand The phenomenon tends to be heavy, and even melt fracture will occur, the spinnability will deteriorate, and the probability of hard ends will increase. The number of ends increases, and it cannot even be stretched, resulting in an increase in the number of spinning ends and wool. Therefore, the spinning temperature must be strictly controlled when spinning fine denier polyester bright 40D/48F FDY.

cooling forming

Cooling molding is one of the important processes of melt spinning. In spinning production, the melt is turned into a solid state by blowing air through the cooling ring. The unevenness of evenness is not only a concentrated reflection of the unevenness of the inherent physical indicators of the fiber, but also an important indicator to measure the quality level of FDY. Wind temperature, humidity, wind speed, pressure and other cooling conditions have different effects on fiber evenness.

oil quantity

The specific surface area of fine denier yarn is large. During the spinning process, the friction between the fiber and the air and between the fiber and the metal equipment, and the static electricity on the fiber will cause the tow to vibrate seriously, which is unfavorable for the single filament bundle and cannot be produced. Therefore, in actual production, a V-shaped oil nozzle is used for fiber oiling and clustering, so that the oil agent forms a uniform oil film on the surface of the silk to reduce the frictional resistance between the fiber and the air and the friction between the fiber and the metal equipment, and improve the fiber. Excellent cohesive force and antistatic properties, improve the uniformity of the arrangement of the filaments during stretching. Therefore, the penetration, spreading width and oil film strength of the oil agent are required to be better; in the actual production, the TK-3588 oil agent independently produced by the Group is used.

Hot roller temperature

The stretching of polyester FDY is completed between G1 godet and G2 godet. The speed of the first hot roller affects the draw ratio of the tow, which needs to be determined according to the spinning performance and the elongation of the tow. The practice of the preparation process of the present invention shows that the temperature of the first hot roller must be higher than the glass transition temperature by 10°C-20°C. After multiple process adjustments, the temperatures of the first and second hot rollers are finally determined to be 95°C and 135°C. The speeds of the first and second hot rollers are 1850m/min and 4850m/min. The process is cold stretching, using unheated godet, in order to compensate for the post-relaxation of the filament, it is heat-set by G2 hot roller, and the hot roller is heated by a special heat medium. When the winding tension is 0.15cN/dtex, A relaxation rate of 0.4 to 0.85 can be obtained, and the package formation is good.

Stretch ratio

The speed ratio of the two godets is the draw ratio. The strength of the polyester fiber increases with the increase of the draw ratio, and the elongation decreases accordingly. This is because under the action of tension, the macromolecules in the fiber move The reason is that the degree of orientation to regular alignment is improved. The strength of the fiber is mainly determined by the degree of orientation of the macromolecules. Slip and fracture occur, which reduces the degree of orientation and the strength. On the one hand, due to the small dpf, the draw ratio of the spinneret becomes larger, which is easy to cause natural tensile fracture; Will add more. Therefore, an appropriate stretch ratio must be selected to ensure stable production and reliable quality. Practice shows that the stretching ratio of polyester FDY is about 2.2 to 2.8 times.

Main Network Pressure

Fine denier polyester Dayouguang 40D/48F FDY is mainly used as raw material for weaving high-grade fabrics downstream, such as warp knitting, high-density woven fabrics, etc. Therefore, good thread cohesion is required. The winding tension of fine denier yarn is relatively high, and due to the large number of single fibers, the cohesion performance will be deteriorated. Moreover, twisting cannot be performed during the high-speed winding process. Therefore, after winding the drafting roller, a network nozzle is installed to carry out network processing, so that the filament bundles are entangled and entangled to enhance the cohesion of the filaments, improve the cohesion performance, and ensure smooth unwinding. The dpf of the fine denier yarn is small, and the torque effect of the yarn is small during the network processing, so a higher network degree can be obtained at a lower air pressure. According to the requirements of the downstream users and combined with the on-site production situation, the fine-denier polyester bright 40D/48F FDY yarn is usually controlled at 20-30 pieces/m under the air pressure of 0.2-0.3MPa.

Winding speed

Due to high-speed spinning followed by high-speed stretching, it is difficult to relax the stress in the filament, and changing different stretching ratios can obtain fully drawn filaments with a breaking elongation of more than 35%. In principle, the speed of the winding head must be lower than the rotation speed of the second stretching, so as to ensure that the stretched filaments can be shrunk to a certain extent under low tension, so as to obtain satisfactory finished product quality and package. Combined with the on-site production situation, the winding speed of polyester FDY is selected as about 4800m/min.

After feedback from downstream manufacturers, the FDY product produced by the melt direct spinning fine denier PET Dayouguang production process used in the present invention is suitable for weaving, dyeing and finishing of textiles, the effect is very good, and fully meets the requirements of post-processing.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (7)

1. a production melt direct spinning fine denier PET big bright production process is characterized in that, comprises the following steps: Step (1), PET melt delivery The PET melt produced by the polyester reaction in the PET melt tower is transported to the booster pump through the discharge pump and the insulation pipeline, and the PET melt is boosted by the booster pump and transported to the melt cooler for cooling. to the spinning line; Step (2), color paste delivery Add the color paste into the color paste silo, the color paste enters the multi-coupler through the color paste silo, the PET melt and the color paste are coupled through the multi-element coupler, after coupling, they are mixed by a static mixer, and then mixed by a static mixer Realize uniform disperse dyeing of polyester melt; Step (3), enter the spinning box The melt evenly dyed by the static mixer enters the spinning box, and the spinning box is connected with the spinning assembly of FDY; Step (4), FDY spinning After step (3), through the spinneret in the spinning box, fully-drawn filaments are formed. After the fully-drawn filaments are separated by the ring blowing cooling device, they come out through the tunnel and enter the oil nozzle clustering device for oiling. , and then enter the pre-netting device, carry out preliminary networking through the pre-netting nozzle, and then fully stretch under the action of the first godet and the second godet, enter the main network network, and then enter the winding machine for coiling and forming , get FDY silk cake; Among them, the fuel injectors of the fuel injector cluster device are V-shaped; The spinning temperature in the spinning box is 295-297°C; The wind speed in the ring blowing cooling device is 0.25-0.55m/s, the wind pressure is 20-60Pa, the wind temperature is 17-23°C, and the humidity is 65-100%RH; The air pressure of the main network is 0.2-0.3MPa, and the network degree of the main network is controlled at 20-30 pieces/m. Step (5), FDY sorting and storage The above-mentioned FDY spinning is subjected to color judgment, appearance inspection, and physical inspection of stocking tubes, and then the qualified products are graded and packaged, and finally the packaged products are put into the finished product three-dimensional warehouse. 2. A kind of production process for producing melt direct spinning fine denier PET according to claim 1, characterized in that, the intrinsic viscosity of the PET melt in step (1) is 0.635-0.645dL g, and the melting point The temperature is 258-262°C, the b value is 2.0-6.30, and the L value is 85-90. 3. A production process for producing melt direct spinning fine denier PET bright light according to claim 1, characterized in that a melt filter is provided at the output end of the discharge pump described in step (1). 4. A kind of production process of melt direct spinning fine denier PET according to claim 1, characterized in that, the accurate metering of color paste is set between the color paste silo and multi-element coupler in step (2) device, and the output end of the static mixer in step (2) is provided with a melt distributing valve. 5. A kind of production process for producing melt direct spinning fine denier PET according to claim 1, characterized in that, the first godet and the second godet described in step (4) are dislocated up and down distribution, the second godet is located above the first godet. 6. A production process for melt direct spinning fine denier PET according to claim 5, characterized in that, the temperature of the first godet is 90-100°C, and the speed is 1750-1950m/ min; the temperature of the second godet is 130-140° C., and the speed is 4750-4950 m/min. 7 . A production process for producing melt direct spinning fine denier PET bright light according to claim 1 , wherein the winding speed of the winding machine in step (4) is 4600-5000 m/min.

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