A method for preparing a multifunctional flexible composite fiber

Abstract

The application discloses a kind of preparation methods of multifunctional flexible composite fiber, comprising the following steps: different color color master batch and different functional slice are respectively sucked into drying tower by suction machine, low dew point compressed air is used to color master batch drying treatment by air compressor and different pre-drying temperature is set, cleaning rod is set to clean the inner wall of drying tower to avoid color master batch residue adhere to the inner wall, after the completion of drying treatment, color master batch is sent into screw extruder and is melted, according to the set proportion by injection pump into MFD mixer and dynamic mixer to complete mixing, by the ball socket and pin inside MFD mixer, the molten color master batch and melt are fully mixed, can effectively avoid melt backflow phenomenon and improve the harmony and dispersibility of pigment in color master batch, by injection pump double pump linkage control, injection ratio can be changed, antibacterial, flame-retardant and other functional master batch can be added simultaneously, and fiber with both color and functionality is prepared.

Description

Technical Field

[0001] This invention relates to the field of melt spinning in the chemical fiber textile industry, specifically to a method for preparing a multifunctional flexible composite fiber. Background Technology

[0002] An online injection system is a direct spinning online additive device and production method for differentiated fibers. It includes a screw extruder, a melt additive metering pump, a static mixer, a mixed melt booster pump, a melt filter, a polyester melt booster pump, a three-way reversing valve, a static mixer, and a spinning box. The main process involves feeding masterbatch into a drying tower via a feeder. After thorough drying, the masterbatch enters the screw, is extruded and melted, and then injected into the melt by the injection pump. After blending and filtration by a dynamic mixer, the melt is transported through pipelines to the metering pump for final spinning. Currently, online injection systems produce relatively limited colored yarns and functional products, and cannot produce composite and multifunctional fibers. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for preparing multifunctional flexible composite fibers, solving the problems of limited color yarn production and limited functional product production in online injection systems, and the inability to produce multifunctional composite fibers.

[0004] The method for preparing a multifunctional flexible composite fiber according to claim 1 includes the following steps:

[0005] S1: Material suction: Using a material suction machine with different frequency conversion control, different colored masterbatches and different functional chips are sucked into the three drying towers respectively;

[0006] S2: Stirring and Drying: Low-dew-point compressed air processed by an air compressor is used to dry the material in the drying tower;

[0007] S3: Melting and conveying: The material after drying in step S2 enters the corresponding screw extruder through the conveying pipeline. The masterbatch and chips are melted and conveyed through the screw extruder.

[0008] S4: Injection: The masterbatch and chips melted in step S3 are injected into the MFD mixer via an injection pump.

[0009] S5: Mixing: The masterbatch and chips are mixed in the injection pump through the MFD mixer, and the pin and ball-and-socket structure is used to achieve full mixing and dispersion; the molten masterbatch is mixed in the MFD mixer and then enters the dynamic mixer to be blended with the polyester melt.

[0010] S6: Spinning: The mixed melt is transported to the metering pump through the pipeline. The metering pump produces a fixed amount of melt into fibers through the spinneret. After cooling and solidification, the fibers are spun and wound into shape.

[0011] Optionally, the drying tower is equipped with a pressure of 0.4-0.6 MPa and a flow rate of 100-250 m³ / h. 3 / h, the first pre-drying temperature is 230-240℃, the second drying temperature is 220-230℃, the agitator in the drying tower is controlled by a coupled on / off signal, and the working time is set to work for 1 minute and stop for 5 minutes;

[0012] By setting different pre-drying temperatures, the masterbatch and chips are ensured to be fully heated and dried. Coupled on / off signals are used to control the agitator in the drying tower, so that dust is not easily generated during agitation and lumps are prevented from sticking together.

[0013] Optionally, the injection pump is equipped with a programmable controller, which controls the linkage control of the two injection pumps;

[0014] By programming and controlling the injection pump frequency, the two injection pumps can operate at equal frequencies. If one pump fails during operation, the other pump can automatically adjust its frequency and correct itself to the process injection ratio. By changing the frequency, the injection ratio of different masterbatches and chips can be changed, ensuring the production of colored silk threads of different colors.

[0015] Optionally, the drying tower is fixedly installed on the support, and its interior is connected to the air compressor through a pipe. The drying tower is equipped with a stirring rod, which is intersected with the cleaning rod and sleeved on the rotating shaft. The upper end of the rotating shaft is fixedly connected to the output end of the first drive motor.

[0016] The masterbatch inside the drying tower can be stirred and collected by the stirring rod and the cleaning rod to prevent the masterbatch and chips from sticking together.

[0017] Optionally, multiple stirring blades are fixedly installed on the surface of the stirring rod, and a rectangular air outlet is provided on the cleaning rod near the inner wall of the drying tower, with a brush fixedly installed around the air outlet;

[0018] The residue of masterbatch and chips adhering to the inner wall of the drying tower can be swept and cleaned with a brush.

[0019] Optionally, the upper end of the cleaning rod is connected to an air duct, the other end of the air duct is connected to the air outlet of an exhaust fan, and the exhaust fan is fixedly installed on the bracket;

[0020] The residue of masterbatch or chips adhering to the inner wall of the drying tower is assisted in being removed by blowing air from the air outlet using an exhaust fan.

[0021] Optionally, the MFD mixer includes a second drive motor, a conveying chamber, and a mixing chamber. A conveying screw is provided inside the conveying chamber. One end of the conveying screw is fixedly connected to the output end of the second drive motor, and the other end of the conveying screw is connected to the conveying chamber. The conveying chamber is fixedly connected to the mixing chamber.

[0022] The molten masterbatch is conveyed into the mixing chamber by a conveying screw in the conveying chamber for thorough mixing.

[0023] Optionally, a ball-and-socket mixer is provided inside the mixing chamber, and a plurality of grooves that fit into the ball-and-socket mixer are provided on the inner wall of the mixing chamber. A first mixing chamber is formed between the grooves and the ball-and-socket mixer. A pin mixer is fixedly connected to the output end of the ball-and-socket mixer, and a second mixing chamber is formed between the pin mixer and the inner wall of the mixing chamber.

[0024] By combining a ball-and-socket mixer with a pin mixer, the molten masterbatch can be fully mixed.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. Three sets of drying towers are used to dry functional masterbatches with antibacterial and flame-retardant properties, as well as masterbatch chips of different colors. A programmable pulse controller is used to adjust the proportion of masterbatches that can be injected into the injection pump, so as to achieve the mixing of multiple masterbatches and thus produce fibers that have both color and functionality. The process can be switched online to reduce abnormalities and increase efficiency. The masterbatches are thoroughly mixed by passing through an MFD mixer, which effectively improves the synergy and dispersibility of pigments in the masterbatches. After being blended into the required color, the masterbatches are mixed with the melt in a dynamic mixer to form a suitable melt for spinning. The melt is then transported through pipelines to a metering pump and finally spun into the desired product.

[0027] 2. By installing a cleaning rod inside the drying tower and connecting it to an exhaust pipe, and placing a brush near the inner wall of the drying tower on the cleaning rod, and opening an air outlet at the location of the brush on the cleaning rod, an exhaust fan blows air into the cleaning rod through the exhaust pipe. The air is then blown out from the air outlet and onto the inner wall of the drying tower, loosening the residue of masterbatch or chips adhering to the inner wall of the drying tower. The loosened residue is then brushed off by the brush, ensuring that the masterbatch or chips do not remain inside the drying tower and cleaning its inner wall.

[0028] 3. By setting up ball-and-socket mixers and pin mixers inside the MFD mixer, the molten masterbatch is fully mixed. Due to the special design of the ball-and-socket structure, the molten masterbatch can be forcibly distributed and mixed multiple times, which can push the molten masterbatch forward continuously and forcibly distribute and mix multiple times during the forward movement. The forced distribution and mixing realizes the movement and distribution of the molten masterbatch from the high-pressure zone at the inlet end to the low-pressure zone at the outlet end during the mixing process. The distribution and mixing flow direction is clear, which can effectively avoid the phenomenon of melt backflow. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the preparation method of a multifunctional flexible composite fiber according to the present invention.

[0031] Figure 2 This is an overall schematic diagram of the drying tower for a method of preparing a multifunctional flexible composite fiber as shown in this invention.

[0032] Figure 3 This is a schematic diagram of the internal structure of the drying tower in the preparation method of a multifunctional flexible composite fiber according to the present invention.

[0033] Figure 4 This is a schematic diagram of a cleaning rod illustrating a method for preparing a multifunctional flexible composite fiber according to the present invention;

[0034] Figure 5 This is a partial enlarged view (a) of the cleaning rod of the method for preparing a multifunctional flexible composite fiber according to the present invention;

[0035] Figure 6 A schematic diagram of the overall structure of an MFD mixer for a method of preparing multifunctional flexible composite fibers according to the present invention;

[0036] Figure 7 This is a schematic diagram of the internal structure of an MFD mixer, which is a method for preparing multifunctional flexible composite fibers according to the present invention.

[0037] In the diagram: 1. Feeder; 2. Drying tower; 21. First drive motor; 22. Exhaust fan; 23. Support frame; 24. Agitator blade; 25. Cleaning rod; 26. Agitator rod; 27. Brush; 28. Exhaust duct; 29. ​​Air outlet; 30. Air compressor; 3. Screw extruder; 4. Injection pump; 5. MFD mixer; 51. Second drive motor; 52. Material inlet; 53. Conveying screw; 54. First mixing chamber; 55. Ball-and-socket mixer; 56. Second mixing chamber; 57. Pin mixer; 58. Conveying chamber; 59. Mixing chamber; 6. Dynamic mixer. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0039] 10. Please refer to the following for details. Figure 1-7 As shown, a method for preparing a multifunctional flexible composite fiber includes the following steps:

[0040] S1: Material suction: Using a material suction machine 1, different colored masterbatches and different functional chips are sucked into three drying towers 2 through different frequency conversion controls;

[0041] S2: Stirring and drying: Low dew point compressed air processed by air compressor 30 is used to dry the material in drying tower 2;

[0042] S3: Melting and conveying: The material after drying in step S2 enters the corresponding screw extruder 3 through the conveying pipe. The masterbatch and chips are melted and conveyed by the screw extruder 3.

[0043] S4: Injection: The masterbatch and chips melted in step S3 are injected into the MFD mixer 5 through a centralized injection pump 4;

[0044] S5: Mixing: The masterbatch and chips are mixed in the injection pump 4 through the MFD mixer 5, and the pin and ball-and-socket structure is used to achieve full mixing and dispersion; the molten masterbatch is mixed in the MFD mixer 5 and then enters the dynamic mixer 6 to be blended with the polyester melt.

[0045] S6: Spinning: The mixed melt is transported to the metering pump through the pipeline. The metering pump produces a fixed amount of melt into fibers through the spinneret. After cooling and solidification, the fibers are spun and wound into shape.

[0046] During operation, materials are drawn into the drying tower 2 via the suction feeder 1. By setting different frequency conversion controls for the suction feeder 1, different colored masterbatches and different functional chips can be drawn into the drying tower 2. After drawing the required amount of material, the suction feeder 1 intermittently stops working, and resumes circulation after a portion of the masterbatches and chips have been used. The color masterbatches and chips entering the drying tower 2 are compressed by a 30°C low dew point air compressor. The internal pressure of the drying tower is set to 0.4-0.6 MPa, and the flow rate is 100-150 m³ / h. 3 The first pre-drying temperature is 130-140℃, and the second drying temperature is 120-130℃. A coupled on / off signal controls the agitator inside the tower, causing it to operate for 1 minute and stop for 5 minutes to ensure the masterbatch and chips are fully heated and dried, minimizing dust generation and preventing clumping. The dried masterbatch and chips enter the screw extruder 3 through pipelines, where they are melted and conveyed. The molten masterbatch and chips then enter the injection pump 4. The injection pump 4 uses a dual-pump linkage control system, ensuring that it operates at equal frequencies under normal production conditions. If one injection pump trips, the other injection pump's operating frequency will adjust accordingly. The frequency automatically increases from 15Hz to 30Hz and can self-correct to the process injection ratio, achieving seamless switching. By adjusting the frequency, the injection ratio of different masterbatches and chips can be changed to produce different colors of colored yarn. The masterbatch in the injection pump 4 enters the MFD mixer 5, and the pin and ball-and-socket structure principle is used to achieve full mixing and dispersion. The mixing capacity is 500kg. The mixed masterbatch is blended with polyester melt through the dynamic mixer 6. After blending, the melt is transported to the metering pump through the pipeline. The metering pump produces a fixed amount of melt through the spinneret to form fibers. After cooling and solidification, the fibers are spun and wound into shape.

[0047] Please refer to the details. Figure 2-5As shown, the discharge port of the suction machine 1 is connected to the inlet of the drying tower 2. The drying tower 2 is fixedly mounted on the bracket 23. A stirring rod 26 is provided inside the drying tower 2. The stirring rod 26 and the cleaning rod 25 are intersected and sleeved on the rotating shaft. The upper end of the rotating shaft is fixedly connected to the output end of the first drive motor 21. Multiple stirring blades 24 are fixedly mounted on the surface of the stirring rod 26. A rectangular air outlet 29 is provided on the cleaning rod 25 near the inner wall of the drying tower 2. A brush 27 is fixedly mounted around the air outlet 29. An air duct 28 is connected to the upper end of the cleaning rod 25. The other end of the air duct 28 is connected to the air outlet of the exhaust fan 22. The exhaust fan 22 is fixedly mounted on the bracket. In operation, the masterbatch entering the drying tower 2 is stirred by the first drive motor 21 controlling the rotation of the stirring rod 26, which in turn drives the stirring blades 24 fixedly installed on the stirring rod 26 to rotate. This ensures that the masterbatch and chips are fully heated and dried, and prevents dust from being generated and clumping. At the same time, the exhaust fan 22 blows air through the exhaust pipe 28, causing the gas to be blown out through the air outlet 29. The blown gas blows the residue of the masterbatch or chips adhering to the inner wall of the drying tower 2, loosening the residue. The residue is then cleaned by the brush 27 surrounding the air outlet 29, thus cleaning the inner wall of the drying tower 2 and preventing the adhesion of substances to the inner wall of the drying tower 2 from hindering the stirring and drying process.

[0048] Please refer to the details. Figure 6-7 As shown, the MFD mixer 5 includes a second drive motor 51, a conveying chamber 58, and a mixing chamber 59. A conveying screw 53 is disposed inside the conveying chamber 58, one end of which is fixedly connected to the output end of the second drive motor. The conveying chamber 58 is connected to the mixing chamber 59. A ball-and-socket mixer 55 is disposed inside the mixing chamber 59. Multiple grooves that fit into the ball-and-socket mixer 55 are provided on the inner wall of the mixing chamber 59. A first mixing chamber 54 is formed between the grooves and the ball-and-socket mixer 55. A pin mixer 57 is fixedly connected to the output end of the ball-and-socket mixer 55. A second mixing chamber 54 is formed between the pin mixer 57 and the inner wall of the mixing chamber 59. In the mixing chamber 56, molten masterbatch enters the MFD mixer 5 through the material inlet 52. The second drive motor 51 controls the conveying screw 53 to rotate and transport the masterbatch to the mixing chamber 59 for melting and mixing. The masterbatch is then fully mixed through the ball-and-socket mixer 55 and the pin mixer 57. Due to the special design of the ball-and-socket structure, the molten masterbatch can be forcibly and repeatedly distributed and mixed, which can continuously push the molten masterbatch forward and forcefully distribute and mix it multiple times during the forward movement. The forced distribution and mixing realizes the movement and distribution of the molten masterbatch from the high-pressure zone at the inlet end to the low-pressure zone at the outlet end during the mixing process. The distribution and mixing flow direction is clear, which can effectively avoid the phenomenon of melt backflow.

[0049] Working Principle: A vacuum feeder 1 draws in masterbatches of different colors and functional chips of different properties into a drying tower 2. After a portion of the masterbatches and chips are used, the material is circulated back in. Low-dew-point compressed air from an air compressor dries the materials in the drying tower 2. The dried masterbatches then enter a screw extruder 3 through a pipeline. The screw extruder 3 melts the materials, including the masterbatches and chips. The molten masterbatches and chips are then injected into an MFD mixer 5 via an injection pump 4. Through dual-pump linkage and a three-system combined control, the system operates under normal production conditions. In this case, the two pumps operate at equal frequencies. Using a programmable controller, if one pump fails during operation, the other pump automatically adjusts its frequency and corrects itself to the process injection ratio. The frequency adjustment changes the injection ratio of different masterbatches and chips. The masterbatches and chips are mixed in the injection pump 4 through the MFD mixer 5. The pin and ball socket structure is used to achieve full mixing and dispersion. After being mixed in the MFD mixer 5, the material enters the dynamic mixer 6 to be blended with the polyester melt. The melt after mixing is transported through pipeline to the metering pump for spinning and winding.

[0050] When the masterbatch is dried, the masterbatch entering the drying tower 2 is stirred by the first drive motor 21 controlling the rotation of the stirring rod 26 and the stirring blades 24 fixedly installed on the stirring rod 26. This ensures that the masterbatch and chips are fully heated and dried, and prevents dust from being generated and preventing clumping. At the same time, the exhaust fan 22 blows air through the exhaust pipe 28, and the air is blown out through the air outlet 29. The blown air blows the residue of masterbatch or chips adhering to the inner wall of the drying tower 2, loosening the residue. The residue is then cleaned by the brush 27 around the air outlet 29, which cleans the inner wall of the drying tower 2 and prevents the inner wall of the drying tower 2 from having any adhering substances that hinder the stirring and drying process.

[0051] When the MFD mixer mixes the molten masterbatch, the molten masterbatch enters the MFD mixer 5 through the material inlet 52. The second drive motor 51 controls the conveying screw 53 to rotate and convey the masterbatch to the mixing chamber 59 for mixing and melting. The masterbatch is then fully mixed through the ball-and-socket mixer 55 and the pin mixer 57. Due to the special design of the ball-and-socket structure, the molten masterbatch can be forcibly and repeatedly distributed and mixed, which can push the molten masterbatch forward continuously and forcibly distribute and mix it multiple times during the forward movement. The forced distribution and mixing realizes the movement and distribution of the molten masterbatch from the high-pressure zone at the inlet end to the low-pressure zone at the outlet end during the mixing process. The distribution and mixing flow direction is clear, which can effectively avoid the phenomenon of melt backflow.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for preparing a multifunctional flexible composite fiber, comprising the following steps: S1: Suction: Using a suction machine (1), different colored masterbatches and different functional chips are sucked into three drying towers (2) through different frequency control. S2: Stirring and drying: Low dew point compressed air processed by air compressor (30) is used to dry the material in the drying tower (2); S3: Melting and conveying: The material after drying in step S2 enters the corresponding screw extruder (3) through the conveying pipeline, and is melted and conveyed by the screw extruder (3) to melt different color masterbatches and chips; S4: Injection: The masterbatch and slices melted in step S3 are injected into the MFD mixer (5) via injection pump (4). S5: Mixing: The color masterbatch and chips are mixed in the injection pump (4) through the MFD mixer (5). The pin and ball-and-socket structure is used to achieve full mixing and dispersion. The molten material is mixed in the MFD mixer (5) and then enters the dynamic mixer (6) to achieve blending with the polyester melt. S6: Spinning: The mixed melt is transported to the metering pump through the pipeline. The metering pump produces a fixed amount of melt into fibers through the spinneret. After cooling and solidification, the fibers are spun and wound into shape. The injection pump (4) is equipped with a programmable controller, which controls the dual-pump linkage control of the injection pump (4); The MFD mixer (5) includes a second drive motor (51), a conveying chamber (58), and a mixing chamber (59). A conveying screw (53) is provided inside the conveying chamber (58). One end of the conveying screw (53) is fixedly connected to the output end of the second drive motor (51), and the other end of the conveying screw (53) is connected to the conveying chamber (58). The conveying chamber (58) and the mixing chamber (59) are fixedly connected. The mixing chamber (59) is provided with a ball-and-socket mixer (55). The inner wall of the mixing chamber (59) is provided with a plurality of grooves that fit into the ball-and-socket mixer (55). A first mixing chamber (54) is formed between the grooves and the ball-and-socket mixer (55). The output end of the ball-and-socket mixer (55) is fixedly connected to a pin mixer (57). A second mixing chamber (56) is formed between the pin mixer (57) and the inner wall of the mixing chamber (59).

2. The method for preparing a multifunctional flexible composite fiber according to claim 1, characterized in that: The feeder (1) is fixedly connected to the feed inlet of the drying tower (2) through a pipe. The discharge outlet of the drying tower (2) is connected to the feed inlet of the screw extruder (3) through a pipe. An exhaust valve is installed at the inlet sight glass of the screw extruder (3). A three-way valve is fixedly installed at the discharge outlet of the screw extruder (3) and fixedly connected to the injection pump (4). A pipe flange is set at the discharge outlet of the injection pump (4) to connect to the material inlet (52) of the MFD mixer (5). A pipe is set at the discharge outlet of the MFD mixer (5) and fixedly connected to the feed inlet of the dynamic mixer (6).

3. The method for preparing a multifunctional flexible composite fiber according to claim 1, characterized in that: The drying tower (2) is equipped with a pressure of 0.4-0.6MPa, a flow rate of 100-250m³ / h, a first pre-drying temperature of 230-240℃, and a second drying temperature of 220-230℃. The agitator inside the drying tower is controlled by a coupled on / off signal, and the working time is set to 1 minute on and 5 minutes off.

4. The method for preparing a multifunctional flexible composite fiber according to claim 1, characterized in that: The drying tower (2) is fixedly installed on the support (23), and its interior is connected to the air compressor (30) through a pipe. The drying tower (2) is equipped with a stirring rod (26), which is intersected with the cleaning rod (25) and sleeved on the rotating shaft. The upper end of the rotating shaft is fixedly connected to the output end of the first drive motor (21).

5. The method for preparing a multifunctional flexible composite fiber according to claim 4, characterized in that: Multiple stirring blades (24) are fixedly installed on the surface of the stirring rod (26). A rectangular air outlet (29) is provided on the cleaning rod (25) near the inner wall of the drying tower (2). A brush (27) is fixedly installed around the air outlet (29).

6. The method for preparing a multifunctional flexible composite fiber according to claim 4, characterized in that: The upper end of the cleaning rod (25) is connected to the air duct (28), and the other end of the air duct (28) is connected to the air outlet of the exhaust fan (22). The exhaust fan (22) is fixedly installed on the bracket (23).

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