Universal preparation equipment and method for producing BCF and UDY filaments

Abstract

The invention relates to the technical field of preparation for producing BCF and UDY filaments, in particular to universal preparation equipment and method for producing the BCF and UDY filaments. On the equipment level, a vacuum drying machine, a feed metering system, a screw extruder, an industrial cooling air conditioner, a silk suction device, a mounting table and the like are integrated into a whole, and the mounting table comprises a double-channel front oil nozzle, a double-channel rear oil nozzle, a pre-network, a guide disc, a feeding roller, a silk dividing roller pair, a full-automatic winding head, a main network device, a full-automatic winding machine and the like. The situation that an enterprise repeatedly invests and purchases multiple sets of independent equipment for producing different types of filaments is avoided, and the production cost of the enterprise is remarkably reduced; in the aspect of a process route, a set of universal and stable process route is constructed by optimizing an equipment structure and collaboratively operating all parts, and when BCF and UDY filaments need to be produced at the same time, equipment does not need to be frequently replaced and process parameters do not need to be greatly adjusted, so that the time and labor cost are saved, and the production efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of BCF and UDY filaments, and particularly to a general preparation device and method for producing BCF and UDY filaments. Background Art

[0002] In the prior art, for the production of BCF and UDY filaments, separate preparation devices and process routes are usually adopted. This specialized production method ensures the high quality and stability of each filament product to a certain extent. Especially for specific types of filament products, such as UDY and BCF filaments produced from PA66 (polyamide 66) chips, through fine process control and equipment optimization, high production efficiency and product quality can be achieved. For example, in key processes such as screw extrusion, spinning, drawing, and texturing, through precise temperature control, pressure regulation, and speed matching, the uniformity of the melt, the tensile properties of the fibers, and the quality of the final product can be ensured.

[0003] However, the separate equipment and process routes lead to repeated investment in production equipment, increasing the production cost and floor area of the enterprise. Especially in the context of tight land resources and rising production costs, this investment model is particularly disadvantageous. Secondly, for enterprises that need to produce BCF and UDY filaments simultaneously, frequently changing equipment and adjusting process parameters not only consume time and effort but also easily affect the stability of production efficiency and product quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a general preparation device and method for producing BCF and UDY filaments, aiming to solve the technical problems in the prior art that the separate equipment and process routes lead to repeated investment in production equipment, increasing the production cost and floor area of the enterprise. Especially in the context of tight land resources and rising production costs, this investment model is particularly disadvantageous. Secondly, for enterprises that need to produce BCF and UDY filaments simultaneously, frequently changing equipment and adjusting process parameters not only consume time and effort but also easily affect the stability of production efficiency and product quality.

[0005] To achieve the above object, a general preparation device for producing BCF and UDY filaments of the present invention includes a vacuum dryer, a feeding metering system, a screw extruder, an industrial cooling air conditioner, a fiber suction device, and a mounting table. The vacuum dryer is arranged on one side of the industrial cooling air conditioner. The output end of the screw extruder is successively provided with a measuring head device, a spinning box, a spinning component, a slow cooler, and a side blowing device. The industrial cooling air conditioner is arranged at the air outlet end of the side blowing device. The air outlet end of the industrial cooling air conditioner is provided with a duct, and the fiber suction device is arranged at the outlet end of the duct. The mounting table is successively provided with a double-channel front and rear oil nozzle, a pre-network, a first guide disk, a second guide disk, a feeding roller, a first filament splitting pair of rollers, a second filament splitting pair of rollers, a full-automatic winding head, a main network device, a full-automatic winding machine, a first drawing hot roller GR, a second drawing hot roller GR, a deformation expander, and a cooling drum. The double-channel front and rear oil nozzle is located at the filament outlet end of the fiber suction device.

[0006] Among them, the screw of the screw extruder has a length-diameter ratio L / D = 30 - 30, and the end of the screw is provided with a mixing device with an extended pin area structure.

[0007] Among them, the screw extruder has six zones, where the first zone is a preheating zone, and the heating zones are in the fourth zone to the sixth zone.

[0008] Among them, the temperature of the first zone is 265 °C, the temperature of the second zone is 270 °C, the temperature of the third zone is 273 °C, the temperature of the fourth zone is 275 °C, the temperature of the fifth zone is 270 °C, and the temperature of the sixth zone is 270 °C.

[0009] Among them, a metering pump is arranged in the spinning box. The pump supply amount of the metering pump is represented by the rotation speed. The rotation speed of the metering pump is related to the production speed, linear density, spinning pump size, and melt density. The process rotation speed formula of the spinning metering pump is as follows:

[0010]

[0011] Among them, the main process conditions of the side blowing for filament cooling are mainly wind speed, temperature, and humidity. Among them, the wind speed is 0.4 - 0.75 m / s, the temperature is 18 - 23 °C, the humidity is 65 - 75 °C. The transverse blowing speed difference of the side blowing device ≤ 10%, and the formula for the difference is as follows:

[0012]

[0013] Among them, an internal sand cup and a spinneret plate are arranged in the spinning component.

[0014] The present invention also provides a general preparation method for producing BCF and UDY filaments, which is applied to the above-mentioned general preparation device for producing BCF and UDY filaments, and includes the following steps:

[0015] S1: First, perform pre-crystallization and drying treatment through a vacuum dryer, set the temperature within the range of 100 - 140 °C, and the drying time is 2 - 6 hours;

[0016] S2: The slices after drying treatment are mixed with one or more raw materials through a feeding metering system. The mixed raw materials enter the barrel of the screw extruder and go through the process of heating and melting;

[0017] S3: The molten material collects information through a measuring head device, monitors the feedback of temperature and pressure, and then enters the spinning box under the action of pressure based on the melt, and is accurately metered through a metering pump;

[0018] S4: The metered output melt enters the spinning component, and after being filtered and sheared by the built-in sand cup and spinneret, it forms a continuous output of filaments. Then, based on the side blowing device, the fiber bundle is quickly cooled by air conditioning blowing. After cooling, the fiber bundle enters the duct;

[0019] S5: The suction device starts to suck the fibers in the duct into the built-in pipeline for collection. The fibers are oiled 360 degrees by the front and rear oil nozzles. Then, based on the pre-network, the fiber bundle is evenly attached with sizing agent. After the fiber bundle is pre-drawn and stretched by the first guide disk and guided by the second guide disk, it enters the feeding roller to wind;

[0020] S6: When producing UDY filaments, the process path is that the fiber bundle undergoes constant tension treatment by the first filament splitting pair roller and the second filament splitting pair roller, and finally enters the fully automatic winding head for speed matching winding and is taken out on the surface of the paper tube to form a finished filament roll;

[0021] S7: When producing BCF filaments, the process path is that the fiber bundle passes through the first draw hot roller GR and the second draw hot roller GR, then through the texturing expander and the cooling drum, then through the first filament splitting pair roller, the main networker and the second filament splitting pair roller, and finally through the fully automatic winder for speed matching winding and is taken out on the surface of the paper tube to form a finished filament roll.

[0022] A general preparation device and method for producing BCF and UDY filaments according to the present invention, at the equipment level, integrates a vacuum dryer, a feeding metering system, a screw extruder, an industrial cooling air conditioner, a filament suction device, and an installation platform including components such as double-channel front and rear oil nozzles, a pre-network, a guide disc, a feeding roller, a filament splitting pair roller, a full-automatic winding head, a main network device, a full-automatic winding machine, etc. into one, forming a set of general equipment, avoiding enterprises from repeatedly investing in purchasing multiple sets of independent equipment for producing different types of filaments, significantly reducing the production cost of enterprises, and at the same time reducing the floor area of the equipment, showing its advantages when land resources are tight. In terms of the process route, by optimizing the equipment structure and the coordinated operation of each component, the specific length-diameter ratio, mixing device, and partition temperature setting of the screw extruder, the precise metering of the metering pump in the spinning box, the control of the appropriate wind speed, temperature, humidity, and the lateral blowing speed difference in the side blowing device, as well as the filtration and shearing of the built-in sand cup and spinneret plate in the spinning component, a set of general and stable process routes are constructed. This enables enterprises, when they need to produce BCF and UDY filaments simultaneously, not to frequently replace equipment and significantly adjust process parameters, saving both time and labor costs, and ensuring the stability of production efficiency and product quality, effectively coping with the challenge of continuously rising production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is the front view of the general preparation device and method for producing BCF and UDY filaments according to the present invention.

[0025] Figure 2 is the side view of the general preparation device and method for producing BCF and UDY filaments according to the present invention.

[0026] Figure 3 is the process path diagram for producing UDY filaments in the general preparation device and method for producing BCF and UDY filaments according to the present invention.

[0027] Figure 4 is the process path diagram for producing BCF filaments in the general preparation device and method for producing BCF and UDY filaments according to the present invention.

[0028] Figure 5 is the step flow chart of the general preparation method for producing BCF and UDY filaments according to the present invention.

[0029] 1-Vacuum dryer, 2-Feed metering system, 3-Screw extruder, 4-Measuring head device, 5-Spinning box, 6-Spinning pack, 7-Slow cooler, 8-Side blowing device, 9-Industrial cooling air conditioner, 10-Tunnel, 11-Filament suction device, 12-Double-channel front and rear oil nozzles, 13-Pre-network, 14-First guide disk, 15-Second guide disk, 16-Feed roller, 17-First filament splitting pair roller, 18-Second filament splitting pair roller, 19-Fully automatic winding head, 20-Finished filament roll, 21-First drawing hot roller GR, 22-Second drawing hot roller GR, 23-Texturing expander, 24-Cooling drum. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0031] Please refer to Figures 1 to 5 , the present invention provides a general preparation device for producing BCF and UDY filaments, including a vacuum dryer 1, a feed metering system 2, a screw extruder 3, an industrial cooling air conditioner 9, a filament suction device 11 and a mounting table. The vacuum dryer 1 is arranged on one side of the industrial cooling air conditioner 9. The output end of the screw extruder 3 is successively provided with a measuring head device 4, a spinning box 5, a spinning pack 6, a slow cooler 7 and a side blowing device 8. The industrial cooling air conditioner 9 is arranged at the air outlet end of the side blowing device 8. The air outlet end of the industrial cooling air conditioner 9 is provided with a tunnel 10, and the filament suction device 11 is arranged at the outlet end of the tunnel 10. The mounting table is successively provided with double-channel front and rear oil nozzles 22, a pre-network 13, a first guide disk 14, a second guide disk 15, a feed roller 16, a first filament splitting pair roller 17, a second filament splitting pair roller 18, a fully automatic winding head 19, a main networking device, a fully automatic winding machine 19, a first and second drawing hot roller GR1, a second drawing hot roller GR22, a texturing expander 23 and a cooling drum 24, and the double-channel front and rear oil nozzles 22 are located at the filament outlet end of the filament suction device 11.

[0032] In this embodiment, the moisture content of the slices after the final drying of the vacuum dryer 1 is < 0.05% - 0.02%. The feeding and metering system 2 mixes one or more raw materials and produces simultaneously. The barrel of the screw extruder 3 can be heated for melting, and the melting is for plasticization, extrusion, and kneading. The measuring head device 4 collects information on the molten state of the material and monitors the feedback of temperature and pressure. The slow cooler 7 can control the interference caused by the temperature of the formed tow in the air environment and achieve the controllability of process conditions. The side air blowing device 8 uses the conditions such as the blowing temperature, air pressure, air speed, and humidity controlled by the air conditioner to continuously and stably output the rectified air flow and blowing area of the side air blowing to quickly cool the tow by blowing. The function of the tunnel 10 is to protect against the interference of external air flow and dust during the fiber cooling process. The function of the fiber suction device 11 is that in the case of draw or winding breakage during continuous production, the fiber suction device 11 is activated to suck the fiber coming down from the tunnel 10 into the built-in pipeline for collection and wait for re-starting the normal spinning. After the oiling on the oil nozzle, the pre-network 13 passes through the adjustable air vortex flow inside the pre-network 13 device to make the fiber tow evenly adhere to the sizing agent. The function of the first guide disk 14 is to pre-draw and stretch the fiber according to the set process speed. The function of the second guide disk 15 is to increase the spinning process guiding. The function of the feeding roller 16 is that the tow winds around the roller surface to match the process speed to keep the overfeed differential speed between the front and rear guide disks constant. The main network device provides a constant tension for the fiber. The function of the fully automatic winding machine 19 is to wind the formed fiber tow on the surface of the paper tube by matching the speed and take it out. The functions of the first and second draw hot rollers GR1 and the second draw hot roller GR22 are that the surfaces of the hot rollers have a heating function and their temperatures are set according to the process requirements. The temperature of the fiber tow starts to soften again when passing through the surface of the hot rollers. The draw ratio is formed by the speed difference between the first and second draw hot rollers GR1 and the second draw hot roller GR22 to stretch and extend the tow. The function of the texturing and bulking device 23 is that the fiber tow enters the texturing nozzle, and the high-temperature and high-pressure vortex air flow in the flow channel makes the tow quickly spiral and stack and deform, and stays briefly in the downstream channel and is quickly cooled and shaped under negative pressure. The function of the cooling drum 24 is that after the fiber tow is preliminarily cooled under negative pressure, it enters the surface of the cooling drum 24 groove and is cooled and shaped again using a large flow rate under negative pressure.

[0033] Further, the screw of the screw extruder 3 has a length-diameter ratio L / D = 30 - 30, and a kneading device with an extended pin area structure is provided at the end of the screw.

[0034] In this embodiment, the screw design of this design is determined according to the characteristics of the spinning chips and the output. The screw for producing PA66 has a length-diameter ratio L / D = 30 - 30. The mixing device can improve the uniformity and stability of the melt viscosity and temperature. The pin structure of the mixing head can disrupt the melt flow and increase the resistance of the melt flow, thereby intensifying the friction and shear action of the material, reducing the residual bubbles in the melt, and being beneficial to the stability of the melt extrusion and improving the extrusion quality.

[0035] Further, there are six zones in the screw extruder 3, where the first zone is the preheating zone, and the heating zones are in the fourth to sixth zones.

[0036] In this embodiment, the heating temperature of the first zone of the screw extruder 3 mainly plays a preheating role, generally 25 - 30 °C higher than the melting point of the chips. If the temperature of the preheating zone is too high, the chips will melt prematurely when reaching the second zone, which will cause the phenomenon of not feeding materials and result in "knotting" blockage of materials.

[0037] Further, the temperature of the first zone is 265 °C, the temperature of the second zone is 270 °C, the temperature of the third zone is 273 °C, the temperature of the fourth zone is 275 °C, the temperature of the fifth zone is 270 °C, and the temperature of the sixth zone is 270 °C.

[0038] Further, a metering pump is provided in the spinning box 5. The pump supply rate of the metering pump is expressed by the rotational speed. Its metering pump rotational speed is related to the production speed, linear density, size of the spinning pump, and melt density. The process rotational speed formula of the spinning metering pump is as follows:

[0039]

[0040] In this embodiment, under the action of pressure, the melt can stably feed into the pump inlet of the metering pump designed in this design. The metering pump is composed of precision gears and can accurately output the melt volume through transmission, thus realizing the precise metering of the material by the process. At the same time, through the metering pump, the melt is accurately metered, uniformly continuous, and overcomes the resistance in the components and pipelines under a certain pressure, and transports the spinning melt to the spinneret plate of the component to be ejected, forming fibers with uniform linear density. The extrusion volume of the metering pump is called the pump supply rate, and its accuracy and stability directly affect the linear density of the filaments.

[0041] Further, the process conditions of the side blowing for cooling the filaments are mainly the wind speed, temperature, and humidity. Among them, the wind speed is 0.4 - 0.75 m / s, the temperature is 18 - 23 °C, and the humidity is 65 - 75 °C. The lateral blowing speed difference of the side blowing device 8 ≤ 10%, and the formula for the difference is as follows:

[0042]

[0043] In this embodiment, the filament cooling and setting conditions play a decisive role in the fiber structure and properties. The rapid shaping of the nascent fiber generates a certain degree of crystallization and orientation, making the cooling of the nascent fiber uniform inside and outside, improving the tensile properties and quality of the fiber, and facilitating the increase of the spinning speed and production efficiency.

[0044] Further, an internal sand cup and a spinneret are provided inside the spinning assembly 6.

[0045] In this embodiment, through the internal sand cup, metal sand and multi-layer nets can be internally placed. The purpose is to filter some impurities in the melt and sort the shear molecular chains, and then enter the micropores of the spinneret to extrude filaments. The spinneret can change the number of filaments and the cross-sectional shape according to process requirements. After precise metering and pressure transmission through the spinneret, the filaments are continuously output as thin filaments.

[0046] In this embodiment, through.

[0047] Please refer to Figure 5 , the present invention also provides a general preparation method for producing BCF and UDY filaments, which is applied to the above-mentioned general preparation equipment for producing BCF and UDY filaments, and includes the following steps:

[0048] S1: First, pre-crystallization and drying treatment are carried out through the vacuum dryer 1, the set temperature is in the range of 100 - 140 °C, and the drying time is 2 - 6 hours;

[0049] S2: The dried chips are mixed with one or more raw materials through the feeding metering system 2, and the mixed raw materials enter the barrel of the screw extruder 3 and undergo a temperature-rising melting process;

[0050] S3: The molten material undergoes information collection through the measuring head device 4, monitors the feedback of temperature and pressure, and then enters the spinning box 5 under the action of pressure based on the melt, and is precisely metered through the metering pump;

[0051] S4: The metered output melt enters the spinning assembly 6, and after being filtered and sheared by the internal sand cup and the spinneret, it forms a continuous output of thin filaments. Then, based on the side blowing device 8, the fiber bundle is rapidly cooled by air conditioning blowing, and the cooled fiber bundle enters the duct 10;

[0052] S5: The suction device 11 is started to suck the fibers in the duct 10 into the internal pipeline for collection. The fibers are oiled 360 degrees by the front and rear oil nozzles, and then based on the pre-network 13, the fiber bundle is evenly attached with the sizing agent. After the fiber bundle undergoes pre-drawing by the first guide disk 14 and is guided by the second guide disk 15, it enters the feed roller 16 to wind around;

[0053] S6: When producing UDY filaments, the process path is that the fiber bundle is provided with constant tension treatment by the first filament splitting pair roll 17 and the second filament splitting pair roll 18, and finally enters the full-automatic winding head 19 for speed-matching winding and is taken out on the surface of the paper tube to form the finished filament roll 20;

[0054] S7: When producing BCF filaments, the process path is that the fiber bundle passes through the first and second drawing and hot rolls GR1 and the second drawing and hot roll GR22, then passes through the deformation and puffing device 23 and the cooling drum 24, then passes through the first filament splitting pair roll 17, the main networker and the second filament splitting pair roll 18, and finally passes through the full-automatic winding machine 19 for speed-matching winding and is taken out on the surface of the paper tube to form the finished filament roll 20.

[0055] In the present invention, the function of the cooling drum 24 is to quickly cool and shape the thermally deformed fibers ejected from the stacking tube. A 7.5KW high-pressure blower is used, and the full pressure is about 10000pa for negative pressure cooling. The rotation speed of the cooling drum 24 is determined according to the BCF discharge volume. As much as possible, the bulked fibers stay on the surface of the cooling drum 24 for a long enough time to achieve an ideal cooling and shaping effect. The cooling effect and the rotation speed need to be matched according to the process. If sufficient cooling is not obtained, factors such as color difference and poor deformation effect will occur. Here, a basic empirical formula is provided for reference:

[0056]

[0057] In the present invention, the full-automatic winding machine 19 adopts the German Oerlikon full-automatic 920 / 8 type winding machine, which can well meet the control performance such as winding tension, speed, doffing time and forming angle, and can easily realize the filament cake winding tasks between IDY and BCF. The setting parameters of each winding forming angle are shown in Table 1.

[0058] Table 1 Winding forming angle

[0059] Winding diameter (cm) Forming angle (°) Winding diameter (cm) Forming angle (°) 100 12-12.5 160 14-14.5 120 12.5-13 ＞160 12.5-16

[0060] The theoretical formula calculation of the doffing time:

[0061]

[0062] The formula calculation of the coefficient of variation (CV value) of the breaking elongation of the finished product:

[0063]

[0064] Where: N1 is the average value; Ni is each measured value; S is the standard value; n is the number of tests.

[0065] In the present invention, an oil agent pump is further included, which is mainly used for oiling the oil agent tow to increase the cohesion, lubricity and antistatic property of the tow, and provide spinning and unwinding for the post-spinning process. This structure adopts double-channel oiling before and after the oil nozzle, and the oiling rate of the tow is quantitatively supplied by the rotation speed of the oil agent pump. In this design, the UDY oiling rate in the process fineness is 0.5%-0.9%, and the BCF oiling rate is 1.1%. This data can be adjusted according to the process.

[0066]

[0067]

[0068] In the present invention, the BCF process hot roller in this device adopts two-stage drafting. The surfaces of the first and second drafting hot rollers GR1 are chrome-plated, and the surface of the second drafting hot roller GR22 is sprayed with ceramic treatment. The purpose of drafting is to make the fiber diameter smaller and the circumference longer under the action of external force, and the fiber deforms along the direction of the acting force, the molecular bonds are stretched, unidirectionally deformed, rearranged and oriented, and at the same time, crystallization occurs. Through reasonable process drafting, stable production can be achieved, and while achieving the fiber quality, the fiber breaking strength can be improved. The BCF drafting multiple is: 3.2 - 4.2 times.

[0069] In the present invention, texturing is an important process for realizing BCF bulked continuous filament (not required for UDY). When the filament enters the texturing chamber after hot drawing and setting, high-pressure and high-temperature compressed air heated to the process requirement temperature enters the texturing blade chamber at high speed and instantaneously expands and deforms in the stuffing flow channel, and then is ejected through the stacking pipe into the negative pressure cooling and setting in the groove of the cooling drum 24. The texturing and bulking effect of BCF is mainly determined by the crimp ratio.

[0070]

[0071] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of realizing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A general preparation device for producing BCF and UDY filaments, characterized in that it includes a vacuum dryer, a feeding metering system, a screw extruder, an industrial cooling air conditioner, a fiber suction device and an installation table. The vacuum dryer is arranged on one side of the industrial cooling air conditioner. The output end of the screw extruder is successively provided with a measuring head device, a spinning box, a spinning component, a slow cooler and a side blowing device. And the industrial cooling air conditioner is arranged at the air outlet end of the side blowing device. A passage is arranged at the air outlet end of the industrial cooling air conditioner, and the fiber suction device is arranged at the outlet end of the passage. A double-channel front and rear oil nozzle, a pre-network, a first guide disk, a second guide disk, a feeding roller, a first filament splitting pair of rollers, a second filament splitting pair of rollers, a full-automatic winding head, a main network device, a full-automatic winding machine, a first drawing hot roller GR, a second drawing hot roller GR, a texturing expander and a cooling drum are successively arranged on the installation table. And the double-channel front and rear oil nozzle is located at the filament outlet end of the fiber suction device.

2. The general preparation device for producing BCF and UDY filaments according to claim 1, characterized in that the screw of the screw extruder has a length-diameter ratio L / D = 30 - 30, and a mixing device with an extended pin area structure is arranged at the end of the screw.

3. The general preparation device for producing BCF and UDY filaments according to claim 2, characterized in that the screw extruder has six zones, wherein the first zone is a preheating zone, and the heating zones are in the fourth zone to the sixth zone.

4. The general preparation device for producing BCF and UDY filaments according to claim 3, characterized in that the temperature of the first zone is 265 °C, the temperature of the second zone is 270 °C, the temperature of the third zone is 273 °C, the temperature of the fourth zone is 275 °C, the temperature of the fifth zone is 270 °C, and the temperature of the sixth zone is 270 °C.

5. The general preparation device for producing BCF and UDY filaments according to claim 4, characterized in that a metering pump is arranged in the spinning box. The pump supply amount of the metering pump is expressed by the rotational speed. Its metering pump rotational speed is related to the production speed, linear density, spinning pump size and melt density. The process rotational speed formula of the spinning metering pump is as follows:

6. The general preparation device for producing BCF and UDY filaments according to claim 5, characterized in that the side blowing process conditions for filament cooling are mainly wind speed, temperature and humidity. Among them, the wind speed is 0.4 - 0.75 m / s, the temperature is 18 - 23 °C, the humidity is 65 - 75 °C. The lateral blowing speed difference of the side blowing device ≤ 10%, and the formula for the difference is as follows:

7. The general preparation device for producing BCF and UDY filaments according to claim 6, characterized in that an internal sand cup and a spinneret plate are arranged in the spinning component.

8. A general preparation method for producing BCF and UDY filaments, applied to the general preparation equipment for producing BCF and UDY filaments as claimed in claim 6, characterized in that, It includes the following steps: S1: First, pre-crystallization and drying treatment are carried out through the vacuum dryer, and the set temperature is in the range of 100 - 140 °C, and the drying time is 2 - 6 hours; S2: The slices after drying treatment are mixed with one or more raw materials through the feeding metering system, and the mixed raw materials enter the barrel of the screw extruder and go through the process of heating and melting; S3: The molten material undergoes information collection through the measuring head device, monitors the feedback of temperature and pressure, and then enters the spinning box under the action of pressure and is accurately metered by the metering pump; S4: The metered melt enters the spinning assembly, and after being filtered and sheared by the built-in sand cup and spinneret, continuous thin filaments are output. Then, based on the side blowing device, the fiber bundle is quickly cooled by air conditioning blowing. After cooling, the fiber bundle enters the duct; S5: The fiber suction device is activated to suck the fibers in the duct into the built-in pipeline for collection. The fibers are oiled 360 degrees by the front and rear oil nozzles, and then based on the pre-network, the fiber bundle is evenly coated with sizing agent. After the fiber bundle passes through the pre-drawing and stretching of the first guide disk and the guiding of the second guide disk, it enters the feeding roller to wind around; S6: When producing UDY filaments, the process path is that the fiber bundle undergoes constant tension treatment by the first filament splitting pair roller and the second filament splitting pair roller, and finally enters the fully automatic winding head for speed matching winding and is taken out on the surface of the paper tube to form a finished filament roll; S7: When producing BCF filaments, the process path is that the fiber bundle passes through the first drawing hot roller GR and the second drawing hot roller GR, then through the texturing expander and the cooling drum, then through the first filament splitting pair roller, the main networker and the second filament splitting pair roller, and finally through the fully automatic winding machine for speed matching winding and is taken out on the surface of the paper tube to form a finished filament roll.

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