Production process of extra-black superfine denier polyester fiber

Abstract

According to the production process of the extra-black superfine denier polyester fiber, a multi-stage mixing system is adopted for collaborative optimization, ultra-low water content and impurity control of extra-black master batches is achieved through a drying system of a screw injection device, and in addition, parameter optimization in the process is adopted, so that the mixing problem caused by the high-proportion adding amount of the extra-black master batches is solved; according to the ultra-black polyester fiber, high-efficiency and uniform mixing is realized, so that the quality of the fiber is strictly controlled in the subsequent metering and spinning process, and the polyester fiber product has an excellent ultra-black effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyester fiber preparation, and particularly relates to a production process of super-fine denier polyester fiber with special black color. BACKGROUND

[0002] The polyester fiber has excellent wrinkle resistance and shape retention, and the clothes made of the polyester fiber are not easy to wrinkle in the wearing process, and can maintain the original shape of the clothes. Secondly, the polyester fiber has high strength and elastic recovery capacity, so that the woven fabric is firm and durable, and can quickly recover to the original shape. Therefore, the polyester fiber is the most important synthetic fiber in people's daily life, and is widely used in the fields of textile and garment manufacturing, etc., and brings a lot of convenience and comfort to our daily life. Among them, the super-fine denier polyester filament with special black color and its fabric have become the preferred material in the field of high-end textiles such as sportswear, because they are light and thin and have excellent properties such as silk-like soft touch. More worth mentioning is that this material also saves the subsequent printing and dyeing process, thereby reducing the burden on the environment, so its market prospect is broad and the profit space is considerable.

[0003] However, it is almost impossible to prepare the super-fine denier polyester filament with special black color by simply increasing the dye concentration or adjusting the printing and dyeing process parameters. In general production process, the online master batch adding method is used to solve this problem, that is, the special black functional color master batch is blended with the polyester melt. However, the traditional master batch adding technology has a significant problem, that is, the blending effect is not ideal: the functional additive components are easy to deposit, agglomerate or degrade, and then form agglomerated particles or other by-products. This not only brings great difficulty to the production process control, but also makes it impossible to guarantee the product quality. Especially in the post-processing process of super-fine denier special polyester fiber with special black color, the broken end phenomenon occurs frequently, and the color of the woven product is also uneven.

[0004] In addition, in the production process of conventional black polyester, the addition amount of carbon black functional master batch is strictly limited, and usually cannot exceed 3.0%. Once this proportion is exceeded, the functional additives are easy to agglomerate and deposit in the polyester melt, which will seriously affect the spinnability of the product and lead to substandard fiber quality. In order to meet the production and use requirements, it is necessary to greatly increase the addition proportion of the special black functional master batch. After cost and use calculation, at least 6.0% of carbon black functional master batch addition amount of the super-fine denier polyester filament with special black color in large-scale production can achieve the purpose. Such a high proportion of addition is equivalent to introducing a large amount of "impurities" into the spinning melt, which not only aggravates the degradation of the spinning melt, but also may cause significant changes in key performance indicators such as viscosity and melting point. At the same time, the agglomeration and deposition of functional components become more prominent, making the process control of product processing and molding become extremely complex and difficult.

[0005] In view of this, we disclose a kind of special black super fine denier polyester fiber production process. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a kind of special black super fine denier polyester fiber production process.

[0007] To achieve the above object, the present application proposes the following technical solutions:

[0008] A kind of special black super fine denier polyester fiber production process, including the following production steps:

[0009] S1, slurry preparation

[0010] PTA and EG are mixed and prepared in proportion, are transported to polymerization device via discharge pump, heat preservation pipeline, are cooled in melt cooler by pipeline transportation, and mixed slurry is obtained;

[0011] S2, into booster pump

[0012] The mixed slurry is transported to booster pump by pipeline to obtain polyester melt, and then is transported to melt distribution valve by booster pump pressure feed;

[0013] Polyester melt is transported to booster pump by pipeline, provides sufficient pressure energy for melt, ensures its stable flow in pipeline and meets the pressure demand, and the temperature is higher (usually 295-300 DEG C) when polymerization device flows out, needs to be reduced to 275 DEG C by cooler to prevent melt degradation;

[0014] S3, into dynamic mixer

[0015] Special black master batch treated by screw injection device is added to dynamic mixer, polyester melt passes through melt distribution valve, enters dynamic mixer and is mixed uniformly with special black master batch;

[0016] S4, static mixer

[0017] The melt of polyester melt and special black master batch is mixed into static mixer again, to ensure that special black master batch is uniformly dispersed in polyester melt, avoid product appearance and performance degradation due to mixing defects, and improve mixing uniformity;

[0018] S5, into spinning beam

[0019] The melt after uniform mixing by static mixer enters spinning beam, and spinning beam is connected with POY spinning assembly base seat in communication.

[0020] S6, POY spinning

[0021] After step (3), the pre-oriented yarn is formed after the spinneret in the spinning beam, the pre-oriented yarn is separated after the ring blowing air cooling device, and then enters the oil nozzle cluster device for oiling, and then enters the pre-networking device, is preliminarily networked through the pre-networking nozzle, and then enters the main network under the action of GR1 and GR2 guide reels, and then is wound into a POY cake on the winding machine, and finally is packaged to obtain the POY cake.

[0022] Further, the intrinsic viscosity of the PET melt is 0.640-0.650 dL / g, the melting point is 258-262℃, the diethylene glycol content is 1.33-1.40%, and the terminal carboxyl group is 40-48 mol / t.

[0023] Further, the dynamic mixer and the static mixer are connected in series through a melt distribution valve, and the static mixer comprises 12-18 layers of spiral units, and the rotating speed of the dynamic mixer is 800-1200 rpm.

[0024] Further, in step S4, the spinning assembly is a 70 mm plate diameter, 24-hole spinneret single plate, and is provided with 80-100 mesh metal sand.

[0025] Further, in step S5, the oil nozzle of the oil nozzle cluster device is a 0.05 mm aperture and 1 mm diameter oil nozzle.

[0026] Further, in step S3, the screw injection device is a screw injection device with a drying system, the screw injection device comprises a complete machine, a feeding tower and a drying system arranged on the feeding tower, the drying system comprises a first temperature sensor at the bottom of the feeding tower, the first temperature sensor is sequentially provided with a drying tower hot air inlet, a second temperature sensor, a heater, a heater inlet and outlet, a glass rotor flowmeter, a first outer wire pipe, a first inner wire ball valve, a laval nozzle, a shockproof electric contact pressure gauge, a pressure gauge buffer pipe, a pressure reducing valve, a Y-shaped filter, a second inner wire ball valve and a dry air pipeline.

[0027] Further, the top of the feeding tower is also provided with a feeding port, and an air exhaust system and a motor for controlling the air exhaust system are arranged on the same horizontal line of the feeding port, the air exhaust system comprises a filter exhaust pipe; the rear end of the filter exhaust pipe is sequentially provided with a vacuum diaphragm box negative pressure gauge, a third temperature sensor, a manual clamping fluorine-lined butterfly valve, a cyclone separator, an exhaust pipe flange, an exhaust pipe, a centrifugal fan and a filter exhaust pipe.

[0028] Further, the dry air pipeline is connected with a high-pressure dehumidification system through a connecting pipeline at the end away from the second inner wire ball valve, and the high-pressure dehumidification system comprises a pre-filter, a high-pressure dehumidification system and a post-filter connected with the connecting pipeline.

[0029] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0030] The application discloses a production process of special black ultrafine denier polyester fiber, which adopts a multi-stage mixing system for synergistic optimization, realizes ultra-low water content and impurity control of special black master batch by using a drying system of a screw injection device, and overcomes the mixing difficulty caused by high proportion of special black master batch by parameter optimization, so that efficient and uniform mixing is realized, thereby ensuring that the quality of the fiber is strictly controlled in the subsequent metering and spinning process, and the polyester fiber product has excellent special black effect.

[0031] It should be understood that all combinations of the aforementioned concepts and additional concepts described in greater detail below can be seen as part of the subject disclosure as long as such concepts are not mutually inconsistent.

[0032] The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description. Additional aspects, embodiments and features of the present teachings will be apparent from the description that follows, or can be learned by practice of the present teachings as described in connection with the appended embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0034] Figure 1 It is a structural schematic diagram of the screw extrusion system of the present application.

[0035] Figure 2 It is a flow chart for preparing polyester fiber of the present application.

[0036] In the figure, 1, the first temperature sensor; 2, dry tower hot air inlet; 3, the second temperature sensor; 4, heater; 5, heater inlet and outlet; 6, glass rotor flowmeter; 7, the first outer tube; 8, the first inner tube ball valve; 9, Laval nozzle; 10, shockproof electric contact pressure gauge; 11, pressure gauge buffer tube; 12, pressure reducing valve; 13, Y-type filter; 14, the second inner tube ball valve; 15, dry air pipeline; 16, connecting pipeline; 17, feed inlet; 18, motor; 19, exhaust pipe with filter; 20, vacuum diaphragm box negative pressure gauge; 21, the third temperature sensor; 22, manual clamping type fluorine-lined butterfly valve; 23, cyclone separator; 24, exhaust pipe flange; 25, exhaust pipe; 26, centrifugal fan; 27, exhaust pipe with filter; 28, pre-filter; 29, high-pressure dehumidification system; 30, post-filter. DETAILED DESCRIPTION

[0037] In order to make the technical personnel in the art better understand the technical solutions of the present application, the preferred embodiments of the present application are described below in conjunction with specific examples, but it cannot be understood as limiting the present patent.

[0038] The test methods or test methods described in the following examples / Comparative Examples are all conventional methods unless otherwise specified; the reagents and materials are all obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0039] In the present application, we choose 7.0% of the special black masterbatch addition ratio. In order to overcome the mixing problem brought by high proportion of addition, we specially equipped dynamic mixer on the pipeline after the screw extruder, filter, and adopted advanced online homogenization dust removal technology and masterbatch drying technology. In this way, efficient and uniform mixing can be realized, so as to ensure that the quality of the fiber is strictly controlled in the subsequent metering and spinning process, and the product can also have excellent special black effect. The specific operation is as follows:

[0040] 1. Spinning assembly

[0041] The spinning pack is the key component in the spinning process. The selection of the spinneret, the filtration effect and the process conditions such as the pack pressure are important conditions to ensure the stability of the spinning process. In the development of the 35 dtex / 24 f polyester POY, on the one hand, the filament fineness of the product is small; on the other hand, the addition of a high proportion of special black functional masterbatch introduces a lot of impurities into the spinning melt, which will promote the occurrence of abnormal conditions such as filament breakage, lint, broken ends, etc., and increase the difficulty of melt spinning. Through the calculation of the shear rate of the melt in the micropore, the spinneret back pressure and the spinneret draw ratio, the rheological properties and other parameters, combined with the spinning mechanism of the polyester melt, and through repeated test analysis, it is determined to use a 70 mm diameter spinneret with 24 holes, equipped with 80-100 mesh metal sand, and the initial pressure of the pack is set to 14.0-15.0 MPa. After a period of production tracking, it is found that during the use of the above pack, the spinning pack service life is 9-10 days, and the overall spinning condition is good.

[0042] 2. Selection of oil nozzle

[0043] Because of the larger proportion of carbon black in the 35 dtex / 24 f polyester POY, the smaller filament linear density and the larger number of holes, etc., compared with the conventional varieties, it is more prone to production instability problems such as excessive spinning tension, more broken ends, uneven dyeing, lint, etc., so it is not suitable to use oil tanker oiling. Through comparative analysis of the oiling effect and product quality of oil nozzles with different structures and hole diameters, this test finally determines to use a 0.05 mm diameter, 1 mm diameter oil nozzle for oiling, which has a smaller friction factor, a more appropriate spinning tension control, a better product dyeing uniformity, and fewer abnormal conditions such as lint and broken ends.

[0044] 3. Cooling conditions

[0045] In the spinning process, the setting of cooling process conditions directly affects the quality and performance stability of the product. After the polyester melt is sprayed from the spinneret, it is still in a flowing state and exhibits an extrusion swelling effect, and cannot immediately contact the cold air, so the cooling speed of the yarn needs to be delayed, and therefore a suitable height of the windless zone needs to be set. This is an important requirement for fine denier yarns for the cooling process. The height of the spinning windless zone refers to the distance between the spinneret surface and the upper end of the outlet area of the cooling air cylinder, and the size of the height will directly affect the temperature and heat transfer speed of the melt stream, and then affect the packing and arrangement of the macromolecular chains, and finally affect the diameter change and unevenness of the melt stream during deformation. After many comparison tests, a windless zone with a height of 40 mm is finally set. After the polyester melt is subjected to the extrusion swelling effect, deformation and refinement, and melt solidification, the yarn needs to be cooled. Because the denier of the single filament of the 35 dtex / 24 f black polyester POY is small, the specific surface area is large, and the cooling speed of the yarn is fast, therefore the air pressure of the cooling air should not be too high, and the air temperature should not be too low. It needs to be further explained that the present application adopts a gradient cooling process. In combination with the above height setting, the gradient cooling process includes a primary cooling zone and a secondary cooling zone, the primary cooling zone of the present application includes a honeycomb-shaped flow regulating device, and the secondary cooling zone includes a temperature gradient module. After repeated tests, the present test adopts a TMT outer ring blowing device, the cooling air pressure is 30 Pa, the cooling air temperature is 20 DEG C, and the relative humidity of the cooling air is 62%, which effectively reduces the occurrence of abnormal conditions such as floating yarn, fuzzy yarn and broken ends.

[0046] 4. Network pressure

[0047] Because of the high proportion of the addition of the black master batch, the bundling property of the black fiber is obviously poor. In order to make the black 35 dtex / 24 f polyester POY have good post-processing performance, the as-spun fiber needs to be subjected to certain network after being oiled, drawn and heat set, that is, the monofilaments in the fiber yarn are intertwined to form network nodes through pressure airflow, so that the fiber yarn has good bundling property and cohesion. In the network processing process, it is particularly important to select a suitable network installation position, the aperture of the network ceramic piece and the size of the network air pressure. For example, if the network air pressure is too low or too high, it is not conducive to the formation of network nodes, and even the yarn breakage and fuzzy yarn may occur. Through continuous exploration, the present test determines to adopt double network technology, and a set of network device with an aperture of 1.3 mm is installed before and after the GR1 godet respectively, and the network air pressure is 0.06 MPa and 0.08 MPa respectively. Under the network conditions, the cohesion between the fiber yarns is good, the unwinding is normal, and the generation of abnormal silk cakes such as cobweb silk, loose ring silk and fuzzy yarn is effectively reduced.

[0048] 5. Drying of black master batch

[0049] The drying degree of the special black master batch is an important prerequisite for ensuring the production and product quality stability, and the high or uneven water content in the chips will accelerate the melt degradation in the spinning process, thus the water content in the master batch needs to be controlled within 50 ppm for producing the fine denier polyester fiber, and the TFB-615B type master batch from Xiamen Lu Yicolor Master Batch Co., Ltd. is selected for ensuring the production and product quality stability, the viscosity of which is as high as 0.565-0.580 dL / g, the melt temperature is 255±5℃, the filtration pressure difference is less than or equal to 1.50, and the color difference value ΔE is less than or equal to 0.60. In the process of spinning the special black 35 dtex / 24 f polyester POY, the advanced online uniformity dust removal technology and the master batch drying technology are adopted for ensuring the drying effect of the master batch and the chips and determining the preferred drying process parameters:

[0050] ①The special black master batch is dusted through the installation of a centrifugal fan;

[0051] ②The compressed air is cooled to below-70℃ through the installation of a dehumidifier, and then the compressed air after dehumidification is heated to 150℃ through a heater, and the master batch is dried for more than 12 hours in a 1000 Kg large-capacity feeding tower / cell to reduce the water content of the master batch to below 50 ppm and remove most of the impurities in the master batch, and the melt quality is improved.

[0052] 6, mixing

[0053] The additives, the special black master batch and the polyester melt are mixed through the installation of a dynamic mixer and a static mixer, so that the functional modifier, the special black master batch and the polyester melt are uniformly mixed and then metered and spun.

[0054] Example 1

[0055] The special black ultrafine denier polyester fiber is prepared according to the production parameters in Table 1, and the prepared polyester fiber is sampled and tested for performance.

[0056] Table 1 Production parameter comparison table

[0057] In order to further analyze the performance of the special black ultrafine denier polyester fiber, the related performance tests are conducted.

[0058] Performance test

[0059] Mechanical property test

[0060] The mechanical properties of the fiber filament include breaking strength and breaking elongation, the breaking strength and the breaking elongation are tested according to GB / T 3916-2013 Textiles-Determination of breaking force and elongation of single yarn in skein form, using a YG-061-1500 tensile strength machine, the tensile speed is set to 100 mm / min, the gauge is 25 cm, the pre-tension is 0.05 cN / dtex, and the average value is obtained through multiple tests.

[0061] Color difference performance evaluation

[0062] The color difference performance evaluation includes dyeing uniformity (gray card) grade and color difference value ΔE comparison.

[0063] The gray card grade standard is divided into five fastness grades according to the distinguishable color difference, i.e. 5, 4, 3, 2 and 1.

[0064] The color difference value ΔE is tested by a color matching instrument, the color difference value obtained is represented by ΔE, and the smaller the value of ΔE, the smaller the color difference of the fiber filament.

[0065] Other performances

[0066] According to the industry use requirements, the fiber blackness value (L*), spinning breakage rate, fiber crystallinity, fiber friction coefficient, strip evenness and color fastness of the super fine denier polyester fiber of the application and the comparative examples are tested, and the test equipment used is the industry standard test equipment.

[0067] Comparative examples 1-3

[0068] In order to verify the influence of the multi-stage mixing system on the uniformity of the polyester fiber, different dynamic and static mixer combination modes are changed, other operations and process parameters are referred to example 1, and the performances of the related products are tested. The combination modes and performance tests are shown in Table 2.

[0069] Table 2 Mixer combination mode and sample performance test

[0070] Comparative example 4

[0071] In order to verify the influence of the screw injection device with a drying system on the uniformity of the polyester fiber, the difference between example 1 is that the whole machine without a drying system is used to replace the screw injection device in example 1.

[0072] It is found through the test that the melt filtration pressure fluctuation of the comparative example is 2 MPa, and the melt filtration pressure fluctuation in example 1 is 0.3 MPa.

[0073] Comparative examples 5-8

[0074] To the influence of the temperature control system of the gradient cooling process on the uniformity of polyester fibers, the first cooling and the second cooling time were changed, other operations and process parameters were referred to Example 1, and the performance of the related products was tested. The combination mode used and the performance test are shown in Table 3.

[0075] Table 3 Gradient cooling time parameters and performance test

[0076] It needs to be further explained that 7% special black master batch is directly added to the traditional production line, and the performance of polyester fibers produced by 12 spinning positions per shift (12 hours) is compared, the test is taken 5 times to obtain the average value, the spinning breakage frequency of the polyester fibers prepared by the traditional process is 28.8 times per shift, the CV value of the yarn evenness is 2.5%, and the breaking strength is 1.8 cN / dtex; while the spinning breakage frequency of the polyester fibers prepared by the production process of the application is 2.6 times per shift, the yarn evenness CV value is 0.8%, and the breaking strength is 2.4 cN / dtex, the special black ultrafine denier polyester fiber of the application has obvious performance advantages.

[0077] From the above data analysis, the special black ultrafine denier polyester fiber of the application uses a multi-stage mixing system for synergistic optimization, uses the drying system of the screw injection device to realize ultra-low water and impurity control of the special black master batch, and in addition to the optimization of the process parameters, overcomes the mixing difficulty brought by the high proportion of special black master batch addition, realizes efficient and uniform mixing, thereby ensuring that the quality of the fiber is strictly controlled in the subsequent metering and spinning process, so that the polyester fiber product has excellent special black effect. The specific analysis is as follows:

[0078] 1. Multi-stage mixing system synergistically optimizes melt uniformity

[0079] Dynamic-static mixer combination design: a dynamic mixer (800-1200 rpm) is connected in series after the melt distribution valve and a static mixer with 12-18 layers of spiral elements, through the dual action of shear force and laminar flow effect, to realize nanoscale dispersion of functional modifiers and polyester melt.

[0080] Technical advantage: the high speed (800-1200 rpm) of the dynamic mixer generates strong shear force to break up agglomerated particles, and the multi-layer spiral structure of the static mixer prolongs the melt residence time to ≥90s, ensuring that the uniformity deviation of the modifier distribution is ≤0.5%.

[0081] Effect analysis: compared with the traditional single mixer process, the fiber blackness value (L*) is reduced to below 12.5, the color difference ΔE is ≤0.8, and the color development uniformity of the special black fiber is significantly improved.

[0082] 2. Screw injection device realizes ultra-low water and impurity control of special black master batch

[0083] The special master batch treatment process of the application adopts a five-stage purification system, specifically through the step-by-step treatment of post-filter (5 μm retention) → high-pressure dehumidifier (dew point ≤-70℃) → pre-filter (10 μm retention) → Y-type filter (metal filter screen) → Laval nozzle (ultrasonic cavitation impurity removal), the moisture content of the master batch is reduced from the conventional 200 ppm to ≤50 ppm, and the impurity content is reduced by 90%.

[0084] Among them, the Laval nozzle and the vacuum membrane box negative pressure table play an important role: the Laval nozzle uses the cavitation effect of high-speed airflow to strip the adsorbed water on the surface of the master batch, and cooperates with the pressure detection device (±0.02 MPa precision) to real-time regulate the airflow speed; the vacuum membrane box negative pressure table maintains-0.08~-0.1 MPa negative pressure in the screw extrusion section, further removing the volatiles in the melt.

[0085] Effect analysis: the melt filtration pressure fluctuation is reduced from ±2 MPa to ±0.3 MPa, and the spinning breakage rate is reduced to less than 0.5 times / ton.

[0086] 3. Gradient cooling process temperature control system

[0087] For the gradient cooling process, specifically, the first cooling zone of the application includes a honeycomb-shaped flow straightening device, and the second cooling zone includes a temperature gradient module. The specific stage-by-stage cooling process operation is as follows:

[0088] First cooling zone (honeycomb-shaped flow straightening device): 0.3~0.5 m / s low-speed wind, 15~30° angle of air supply, the fiber surface temperature is reduced from 280℃ to 180~200℃, forming a dense skin layer;

[0089] Second cooling zone (temperature gradient module): 0.8~1.2 m / s high-speed wind cooperates with a gradient of 8~12℃ temperature drop per 10 cm, the core temperature is reduced to 80~100℃, avoiding stress concentration.

[0090] Effect analysis: the fiber crystallinity is increased to 45%~48%, and the breaking strength is ≥2.3 cN / dtex, which is better than the conventional process of 1.8 cN / dtex.

[0091] 4. Oiling technology

[0092] The application adopts a 0.05 mm aperture and 1 mm diameter oil nozzle for oiling. The oil nozzle has a diamond-like coating (Ra≤0.05 μm), which can reduce oil residue and has a uniform oiling uniformity CV value ≤1.5%; its friction coefficient is smaller, the spinning tension control is suitable, the product dyeing uniformity is better, and the abnormal conditions such as loose yarn and broken ends are less.

[0093] Effect analysis: the fiber friction coefficient is reduced from 0.25 to 0.18.

[0094] While the application has been described by way of example with reference to preferred embodiments, it is to be understood that this application is not limited to the embodiments disclosed, but is intended to cover various arrangements or modifications thereof which fall within the spirit and scope of the application. Hence, specific structural and functional details disclosed herein are not to be interpreted as limiting but merely as a basis for the claims and / or as a representative way by which the features can be practiced. Therefore, it is to be understood that other alternatives and modifications thereof can be employed apart from the various embodiments disclosed and that the scope of the following claims is not to be limited to the preceding description.

Claims

1. A process for producing a textured ultrafine denier polyester fiber, characterized by, The production steps include: S1, slurry preparation PTA and EG are mixed and prepared in proportion, transported to the polymerization device through the discharge pump and heat preservation pipeline, cooled in the pipeline to the melt cooler, and mixed slurry is obtained; S2, into the booster pump The mixed slurry is transported to the booster pump through the pipeline to obtain the polyester melt, and then transported to the melt distribution valve through the booster pump; S3, into the dynamic mixer The special black master batch treated by the screw injection device is added to the dynamic mixer, and the polyester melt is mixed with the special black master batch in the dynamic mixer through the melt distribution valve; S4, static mixer The polyester melt mixed with the special black master batch enters the static mixer again to ensure that the special black master batch is uniformly dispersed in the polyester melt, avoid product appearance and performance degradation caused by mixing defects, and improve the uniformity of mixing; S5, into the spinning beam The melt uniformly mixed by the static mixer enters the spinning beam, and the spinning beam is connected with the POY spinning assembly base; S6, POY spinning After step (3), the pre-oriented yarn is formed after the spinneret in the spinning beam, the pre-oriented yarn is separated by the ring blowing air cooling device, passes through the duct, enters the oil nozzle bunching device for oiling, enters the pre-networking device, is preliminarily networked through the pre-networking nozzle, is guided by the GR1 and GR2 godets, enters the main network, and is wound into a POY cake on the winding machine, and finally is packaged.

2. The production process of the textured ultrafine denier polyester fiber according to claim 1, characterized in that, The PET melt has an intrinsic viscosity of 0.640-0.650 dL / g, a melting point of 258-262℃, a diethylene glycol content of 1.33-1.40%, and a carboxyl end group of 40-48 mol / t.

3. The production process of the textured ultrafine denier polyester fiber according to claim 1, characterized in that, The dynamic mixer and the static mixer are connected in series through the melt distribution valve, and the static mixer includes 12-18 layers of spiral units, and the dynamic mixer has a rotation speed of 800-1200 rpm.

4. The production process of the super fine denier polyester fiber according to claim 1, characterized in that, In step S4, the spinning assembly is a 70 mm plate diameter, 24-hole spinneret single plate, and is provided with 80-100 mesh metal sand.

5. The production process of the super fine denier polyester fiber according to claim 1, characterized in that, In step S5, the oil nozzle of the oil nozzle bunching device is a 0.05 mm aperture and 1 mm diameter oil nozzle.

6. The production process of the super fine denier polyester fiber according to claim 1, characterized in that, In step S3, the screw injection device is a screw injection device with a drying system, which includes a complete machine, a feeding tower, and a drying system arranged on the feeding tower. The drying system includes a first temperature sensor (1) at the bottom of the feeding tower, which is sequentially provided with a drying tower hot air inlet (2), a second temperature sensor (3), a heater (4), a heater inlet and outlet (5), a glass rotor flowmeter (6), a first outer wire pipe (7), a first inner wire ball valve (8), a Laval nozzle (9), a shockproof electric contact pressure gauge (10), a pressure gauge buffer pipe (11), a pressure reducing valve (12), a Y-type filter (13), a second inner wire ball valve (14), and a dry air pipeline (15).

7. The production process of the super fine denier polyester fiber according to claim 6, characterized in that, The top of the feeding tower is also provided with a feeding port (17), and an air exhaust system and a motor (18) for controlling the air exhaust system are arranged on the same horizontal line as the feeding port (17), wherein the air exhaust system comprises a filtering exhaust pipe (19); the rear end of the filtering exhaust pipe (19) is sequentially provided with a vacuum membrane box negative pressure gauge (20), a third temperature sensor (21), a manual clamping fluorine-lined butterfly valve (22), a cyclone separator (23), an air exhaust pipe flange (24), an air exhaust pipe (25), a centrifugal fan (26) and a filtering air exhaust pipe (27).

8. The production process of the super fine denier polyester fiber according to claim 6, characterized in that, The dry air pipeline (15) is connected with a high-pressure dehumidification system through a connecting pipeline (16) at one end away from the second inner wire ball valve (14), and the high-pressure dehumidification system comprises a pre-filter (28), a high-pressure dehumidification system (29) and a post-filter (30) which are connected with the connecting pipeline (16) in line.

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