PL243610B1 - Technological line for producing filament and method of producing filament - Google Patents

Abstract

The technological line for producing filament (1) has, located along the cylindrical web of filament (1) extruded from the extruder (2), and arranged in succession: an extraction unit (3) for receiving the filament (1) from the extruder (2) and its extraction and diameter correction , a measuring unit (7) for measuring the diameter of the filament (1) and a winder unit (9) for storing the finished filament (1) on the spool (95). Moreover, the technological line has a compensation unit (5) for filament tension (1), located between the extraction unit (3) and the measuring unit (7). A measuring gap is created in the compensation unit (5) with a width equal to the minimum internal diameter of the nozzle (21) used in the extruder (2). The compensation unit (5) has a set of at least three first height sensors, located at different heights, on opposite sides of the measurement slot, and detecting the vertical passage of the filament (1) through the first sensor. The filament (1) is arranged in the form of a loop (56) placed inside the measuring slot of the compensation unit (5), and the hanging height of the loop (56) of the filament (1) is maintained within the set limits. The method consists in laying the filament (1) between the extraction unit (3) and the measuring unit (7) in the form of a freely falling loop (56) with an overhang, and the hanging height of the loop (56) of the filament (1) is maintained at given limits.

Description

Description of the invention

The subject of the invention is a technological line for producing filament and a method of producing filament intended for 3D printers.

A device for producing fibers from synthetic resin used as a raw material for forming a three-dimensional object using a three-dimensional printer is known from patent description No. KR 101931122 B1. The filament making equipment includes: an extruder that melts and extrudes the synthetic resin to fall freely by gravity; and a fiber guide including an inclined surface that is supported by intimate contact with a front end of the molten synthetic resin, wherein the front end of the molten synthetic resin rotates on the inclined surface at a predetermined height, the molten synthetic resin coming into intimate contact with the inclined surface solidifies to form the fiber , and the solidified fiber is spirally displaced in a downward direction along the inclined surface to produce a spiral-shaped fiber.

Also known from description No. US 20190375142 A1 is a device that recycles thermoplastics to produce fiber (filament) for 3D printing devices. The shredded thermoplastic is fed into the hopper, pushed by a motor-driven screw into the barrel, the axial force of which is maintained by the axial bearing. The thermoplastic is melted using electric heating resistors and passes through a degassing zone connected to a vacuum pump. The thermoplastic is pressed through a die and cooled in a cooling tray with a water circulation system. The filament diameter is controlled by the extractor based on the data obtained in the filament diameter measuring system. The entire process is controlled by a microcontroller.

US 2018147792 A1 discloses a device for producing a bonded three-dimensional continuous element woven from a plurality of molten filaments, which includes a hardness measurement system and performs feedback control on at least one of the molten fiber supply device and the three-dimensional structure forming device to reduce fluctuations hardness of a formed element made of continuous fiber, three-dimensionally connected.

In the described device solutions, the filament is cooled by water or air circulation.

The aim of the invention is to obtain a filament of improved quality, especially a stable filament diameter along its entire length.

A technological line for the production of filament, with the following elements located along the cylindrical ribbon of the filament extruded from the extruder and arranged in the following order: an extraction unit for receiving the filament from the extruder, its extraction and diameter correction, a measuring unit for measuring the diameter of the filament and a winder unit for storing the finished filament on the spool, according to The invention is characterized by the fact that it has a filament tension compensation unit, located between the extraction unit and the measuring unit, and in the compensation unit there is a measuring gap with a width equal to the minimum internal diameter of the nozzle used in the extruded cup, and in addition, the compensation unit has a set of at least three first height sensors placed at different heights, on opposite sides of the measurement slot and detecting the vertical passage of the filament through the first sensor, the filament is arranged in the form of a loop placed inside the measurement slot of the compensation unit, and the hanging height of the filament loop is maintained within the set limits.

Preferably, the technological line has a second microprocessor control module placed in the compensation unit, which generates a square signal with a given frequency, different for each of the first sensors, in the infrared band invisible to humans, resistant to interference and with a range adjusted to the infrared transmitter and receiver in the first one. height sensor, and this square signal with a given frequency is transmitted through the wires of the transmitting path, the first sensor and the wires of the receiving path back to the second control module, where the transmitted and received frequency is compared, and when the received frequency is disturbed by a set value, a signal is sent a filament cut is reported in the first sensor of the transmitter-receiver track, and data with the number of the first sensor are sent to the winder unit via a transmission cable, and an optical signaling device is activated.

Further benefits are obtained if the extraction unit in the technological line has air or water cooling of the filament.

A method of producing filament, using the technological line specified above, in which a cylindrical ribbon of filament is extruded through nozzles from the extruder, collected and withdrawn from the extruder and cooled in a extraction unit with filament diameter correction, and then the diameter of the hardened filament is controlled in the measuring unit, and then the finished filament is wound and stored in the winder unit. According to the invention, it is characterized by the fact that between the extraction unit and the measuring unit, the filament is laid in the form of a freely falling loop with an overhang, and the height of the overhang of the filament loop is maintained within the set limits.

Preferably, the sag height of the filament loop is controlled in the compensation unit, and moreover, the sag height of the filament loop is adjusted by changing the speed of winding the finished filament onto the spool in the winder unit.

The advantage of the solutions according to the invention is that after the filament leaves the extraction unit, it is guided in a controlled loop with a monitored sag height. An appropriately long loop ensures additional cooling and consolidation of the filament diameter and stable extraction from the preceding system of extraction rollers without any jerks or downtime in the extraction unit, which has a positive effect on the quality of the filament, and in particular on the stability of the diameter along the length of the filament web.

The subject of the invention is shown in embodiments in the drawing, in Fig. 1^4 in perspective views, and in Fig. 5^8 in block diagrams, Fig. 1 shows the technological line in the first embodiment for producing the filament using the dry method, Fig. 2 - technological line in the second version, for producing filament using the wet method, Fig. 3 - compensation unit of the technological line, Fig. 4 - measuring unit of the technological line, Fig. 5 - first control module of the extraction unit, Fig. 6 - second module control module of the compensation unit, Fig. 7 - the third control module of the measuring unit, and Fig. 8 - the fourth control module of the winder unit.

The technological line for the production of filament 1, according to the invention in the first embodiment with air cooling, i.e. filament 1 produced by the dry method, has the following elements located along the cylindrical web of filament 1 extruded from extruder 2 and arranged in succession: extraction unit 3 for receiving filament 1 from extruder 2 , its withdrawal and diameter correction, the compensation unit 5 for the tension of the filament 1, the measuring unit 7 for measuring the diameter of the filament 1 and the winder unit 9 for storing the finished filament 1.

The extruder 2 has a nozzle 21 with an internal diameter slightly larger than the required diameter of the finished filament 1.

The extraction unit 3 has up to a dozen or so aluminum extraction rollers 31 with a circumferential groove, rotatably mounted on a supporting beam 32 supported on the first two portable bases 33 with adjustable height. The hot filament 1 from the nozzle 21 of the extruder 2 is brought to the specified diameter by pulling it on the extraction rollers 31 and air cooling from the cooling pipe 34 with holes selected depending on the configuration and number of extraction rollers 31. The cooling pipe 34 is mounted on a support beam 32, placed under the extraction rollers 31 and connected to a fan 35 equipped with a speed controller 36 for regulating the cooling air flow. The fan 35 with the regulator 36 are mounted on a frame on one of the first bases 33. Next to the row of extraction rollers 31, there is a portable, first control column 37 with the first technological line control panel 38 located in its upper part. The extraction unit 3 is driven by a digital, first 39 stepper motor, from which the rotation is transmitted to one of the extraction rollers 31, and then via belts and gears to the remaining extraction rollers 31 of the extraction unit 3. The first motor 39 is connected with cable connectors through its motor the first controller 40 with the first microprocessor control module 41 of the extraction unit 3, placed in its first column 37. The speed of the filament 1 is regulated manually from the first panel 38, where the first LCD display 42, the first rotary encoder 43 and the first three-position button 44 are located, for setting operating parameters of the technological line, and these elements are connected by wire connectors to the first control module 41, which has a first WiFi-type wireless module 45 with a first antenna 45.

The compensation unit 5 includes a portable second control column 51 in which a longitudinal measuring slot 52 is created with a width equal to the minimum internal diameter of the nozzle 21 used in the extruder 2, and the second column 51 has a set of at least three first height sensors located at different heights of the second column. 51, each consisting of an infrared transmitter 54 and an infrared receiver 55, arranged on opposite sides of the measuring slot 52 and detecting the vertical passage of the filament 1 through the first sensor 53. The freely falling filament 1 from the last extraction roll 31 of the extraction unit 3 is transferred through the compensation unit 5 to measuring unit 7 in the form of a loop 56 placed inside the measuring slot 52 of the compensation unit 5, and the sag height of the loop 56 of the filament 1 is detected in the microprocessor second control module 57 located in the second column 51 of the compensation unit 5. A square wave signal is generated in the second control module 57 with a given frequency, different for each of the first sensors 53, in the infrared band invisible to humans, resistant to interference, and with a range adjusted to the transmitter 54 and receiver 55 in the first height sensor 53. A square wave signal with a given frequency is transmitted via wires through the transmitting path 58, the first sensor 53 and the receiving path wires 59 back to the second control module 57, where the transmitted and received frequencies are compared. When the received frequency is disturbed by a given value, a cut signal is sent by the filament 1 in the first sensor 53 of the transmitter 54 - receiver 55 track and information with the number of the first sensor 53 is sent to the winder 9 via the transmission cable 60, and in addition, the optical indicator 61 located in upper part of the second column 51.

The measuring unit 7 includes a third control column 71 with a second technological line control panel 72 located in its upper part. From the compensation unit 5, the filament 1 is introduced into the measuring unit 7 onto horizontally mounted guide rollers 73 in the number of at least three pieces and vertical guide rollers 74, with rollers 73, 74 leveling the course of the filament 1 and introducing it to the measuring subassembly 75 of the diameter of the filament 1 between the measuring rollers 76, 77 are permanently attached to the supporting profile 78 supported on the third column 71 of the measuring unit 7. The lower measuring roller 76 is permanently attached to the base 79 on the supporting profile 78, and the movable upper measuring roller 77 is attached to the sliding rail of the trolley linear 80 permanently attached to the base 79. The above-mentioned sliding rail ensures precise vertical movement of the upper measuring roller 77 and easy tracking of the thickness of the filament 1 in the measuring subassembly 75. Constant pressure of the upper measuring roller 77 through the rail of the linear carriage 80 is ensured by a spring built into a mechanical second dial sensor 81, which simultaneously measures the diameter of the filament 1 in the measuring subassembly 75. In addition, the measuring subassembly 75 has a third magnetic field sensor 82 for measuring the diameter of the filament 1, mounted on a stationary linear carriage 80, opposite the transverse arm 83 with the adjustment screw ended with a magnet, whereby the arm 83 is mounted on the sliding rail of this linear carriage 80, thanks to which the distance between the measuring rollers 76, 77 in the measuring subassembly 75 is converted into the value of the magnetic field of the third sensor 82 and subsequently into the value of the voltage read from this third sensor 82 and transmitted via the sensor cable 84 to the third control module 85 located in the third column 71 of the measuring unit 7. On the second panel 72 of the third column 71 of the measuring unit 7 there is a graphic, second LCD display 86 for presenting filament 1 diameter measurements in the form of a graph, and a second rotary encoder. 87 for setting the speed parameters for reading the diameter of filament 1 and calibrating sensors 81,82, and these elements are wired to the third control module 85, which is also wired to the acoustic alarm 88 and the second WiFi wireless module 89 with the second antenna 90. The acoustic signal 88 signals when the permissible tolerance for the diameter of filament 1 is exceeded, for example for filament 1 with a diameter of 1.75 mm it is +/- 0.05 mm. The third control module 85 has a configurable wired connector (not shown) for connecting an additional filament 1 diameter measurement sensor, such as a laser sensor, a non-contact or contact distance meter, or a laser micrometer. Thanks to the second wireless module 89 of the WiFi AP/STA type of the third control module 85, it is possible to wirelessly exchange data of the measuring unit 7 with the first wireless module 45 of the extraction unit 3 and the winder unit 9 as well as with the home or company WiFi network in order to present and correct the operating parameters of the line via using the embedded web server.

The winder assembly 9 includes a fourth control column 91 with a third process line control panel 92 located in its upper part. From the measuring unit 7, filament 1 is wound through the rotating rollers 93 of the stacker 94 onto the spool 95 mounted on the spindle 96 with a rotating driver, the drive of the winder 9. The spool 95 is secured against slipping off the spindle 96 by means of a lock 97. Operating speed of the stacker 94 equipped with a digital second a stepper motor 98 connected by wire through the motor, the second controller 99 to the fourth control module 100 of the winder unit 9 is regulated from the third panel 92 of the fourth column 91. The width of winding the filament 1 onto the spool 95 is set by the left and right limit switches 101, 102, which are connected wired to the fourth control module 100 of the winder unit 9. The parameters of the proportional-integral-derivative (PID) control algorithm for automatic operation, the manual operation mode and the operating speed of the stacker 94 are adjusted from the third panel 92 of the fourth column 91. On the third panel 92 there is a third display 103 LCD, a third rotary encoder 104 and a second three-position switch 105 for setting operating parameters of the technological line, and these elements are wired to the fourth control module 100 of the winder unit 9, which has a third WiFi wireless module 106 with a third antenna 107 for communication wireless with the second wireless module 89 of the measuring unit 7. Moreover, the fourth control module 100 is connected via a transmission cable 108 to the output of the second control module 57 of the compensation unit 5. The drive of the winder 9 is in the form of a digital, third stepper motor 109 connected by wire through its third motor controller 110 to the output of the fourth control module 100 of the winder unit 9.

All columns 37, 51, 71 and 91 have transport handles 111 and transport wheels 112 in their rear part, increasing the mobility of the technological line, and its elements can be used independently and constitute, for example, part of the filament 1 production line using the wet method. The spacing of the technological line elements is adapted to the type of filament 1 produced and is usually approximately 1 m. The spacing and configuration of the extraction rollers 31 and the cooling efficiency of the filament 1 are changed depending on the physical properties of the filament 1.

The technological line for the production of filament 1, according to the invention in the second embodiment with water cooling, i.e. filament 1 produced using the wet method, has, identical to the first embodiment, filament 1 extruded from the extruder 2 located along the cylindrical web and placed successively after the extraction unit 3 for receiving the filament 1 from the extruder 2, its extraction and diameter correction: compensating unit 5 for the tension of the filament 1, measuring unit 7 for measuring the diameter of the filament 1 and winder unit 9 for storing the finished filament 1, with the extraction unit 3 being cooled with water instead of cooling air.

The hot filament 1 flowing from the nozzle 21 of the extruder 2 is passed through the flow slots 121,122 in the upper tank 123 with water. The slots have a width slightly larger than the extruded filament 1 to accumulate water to a level higher than the height of the nozzle 21 of the extruder 2, thanks to which the filament 1 is introduced directly under the water surface. The fourth water level measurement sensor 124 is mounted in the upper tub 123, controlling the operation of the pump 125 located in the lower water tank 126, connected to the upper tub 123 by an inlet pipe 127. Excess water flowing out through the flow slots 121, 122 of the upper tub 123 is collected by a wider, lower bathtub 128, which has a drain pipe 129 draining excess water to the tank 126. At the outlet flow slot 122, on the lower edge of the upper bathtub 123, a scraper 130 for residual water from the filament 1 is installed. The upper bathtub 123 is filled with water, the temperature of which is regulated by heater placed in the tank 126. The temperature difference between the filament 1 let into the upper tub 123 and the water is selected depending on the material of the extruded filament 1, and by selecting the appropriate temperature of the filament 1 at the exit from the upper tub 123, it is possible to further drag or deform it through the rollers extraction units 31 of the extraction unit 3. Tubs 123, 128 are mounted on a supporting beam 32 supported on the first two height-adjustable bases 33. Behind the supporting beam 32, there is a portable, first control column 37 with the first technological line control panel 38 located in its upper part.

The hot filament 1 flowing from the nozzle 21 of the extruder 2 is held under the water surface and pulled away by the pressure rollers 131 of the extraction unit 3 in an amount of at least two pieces. The pressure roller 131 is mounted in a way that allows it to move freely vertically and press its weight on the filament 1, while the pressure rollers 131 are covered with a material ensuring appropriate friction and is driven by a precise digital first stepper motor 39 together with the extraction rollers 31 of the extraction unit 3 The main correction of the filament 1 to the required diameter is carried out in the section between the nozzle 21 of the extruder 2 and the inlet flow slot 121 of the upper bath 123. It is also possible to correct the diameter of the filament 1 in water when the temperature difference between the water and the extruded filament 1 is small, which causes its slow cooling.

In the method of producing filament 1, according to the invention in an embodiment, the technological line specified above is used. A cylindrical ribbon of filament 1 is extruded through nozzles 21 from extruder 2, collected and drawn off from extruder 2 and cooled in the extraction unit 3 with correction of the diameter of filament 1, after which the diameter of the hardened filament 1 and then the finished filament 1 are checked in the measuring unit 7. is wound and stored in the winder unit 9. Between the extraction unit 3 and the measuring unit 7, the filament 1 is laid in the form of a freely falling loop 56 with an overhang. The sag height of the loop 56 of the filament 1 is maintained within the given limits. Moreover, the sag height of the loop 56 of the filament 1 is controlled in the compensation unit, and the height of the sag of the loop 56 of the filament 1 is adjusted by changing the speed of winding the finished filament 1 onto the spool 95 in the winder unit 9.

The principle of operation of the technological line for producing filament 1 is described below.

The hot filament 1 flowing from the nozzle 21 of the extruder 2 is air-cooled and pulled on the extraction rollers 31 of the extraction unit 3, coupled with belts and gears, driven by a precise, digital, first 39-step motor to the required diameter. Then, in its still flexible state, the still warm filament 1 is arranged into a freely falling loop 56 passing through the measuring slot 52 of the compensation unit 5 of the technological line. The compensation unit 5 monitors the sag height of the loop 56, and this information is transmitted to the technological line operator via the optical signal 61, and sent via the transmission cable 60 to the winder unit 9 to set the appropriate winding speed and placing the filament 1 on the spool 95. Through a suitably long loop 56 enables additional cooling and consolidation of the diameter of the filament 1 and ensures stable extraction from the previous system of extraction rollers 31 without jerks or downtime, which has a beneficial effect on the quality of the filament 1. The properly hardened filament 1 is introduced into the measuring unit 7, where it is stabilized through bearing-mounted, grooved guide rollers 73 and fed between the measuring rollers 76, 77 of the measuring subassembly 75. In the measuring unit 75, a precise measurement of the diameter of filament 1 is made using two sensors 81, 82, a mechanical clock and a magnetic field, and the measurement result is presented in the form of a graph to illustrate the trend in the diameter of filament 1. This trend is analyzed by the technological line operator or the third control module 85 of the measuring unit 7 and the diameter of filament 1 is corrected by changing the speed of the extraction unit 3. By increasing the speed of the extraction rollers 31, a higher pulling speed is achieved and greater stretching of the material, which consequently reduces the diameter of filament 1, and reducing the speed has the opposite effect. Depending on the speed of the technological line, the effect of changing the speed of the extraction unit 3 is visible in the graph on the second panel 72 of the measuring unit 7 after a certain moment, therefore it is important to accurately analyze the presented data to predict the behavior of the diameter of the produced filament 1. The measuring unit 7 has an acoustic signal 88 , through which the operator is informed about approaching and exceeding the permissible tolerance of the diameter of filament 1. In parallel, information from measurements and the status of the entire technological line is sent via wireless modules 45, 106 to the second wireless module 89, which has the ability to connect to existing WiFi networks and has its own WiFi AP access point, where a programmed web server presents data to the operator in the form of an HTML page available via web browsers from mobile devices and desktop computers. The scripts on the websites present data that allows you to change the parameters of the technological line and other devices connected to it, such as an extruder with a WiFi module.

From the measuring unit 7, the filament 1 is transferred to the rotating rollers 93 of the stacker 94, to ensure its even layering on the spool 95. The digitally controlled second adjustable speed stepper motor of the stacker 94 changes the direction of stacking after the position is reported by one of the two limit switches 101, 102. The spool 95 is mounted on the pin 96 with a driver and secured with a lock 97. The pin 96 is connected via a gear to the digital third stepper motor 109 of the winder unit 9. The fourth control module 100 analyzes data about the position of the loop 56 from the compensation unit 5 and optimally, the winding speed is determined using PID control and edited control parameters, so that minimal vertical movements are made in the loop 56 of filament 1. The winder unit 9 is set to automatic or manual mode, and the operating parameters are presented and corrected from its third panel 92, fourth column 91 of the winder unit 9.

Information about the number of the first sensor 53 of the height of the interrupted transmitting track 58 and receiving track 59 in the compensation unit 5 is transferred to the winder unit 9, where in the fourth control module 100 the speed of winding the filament 1 onto the spool 95 is calculated based on the set parameters and PID control to maintain optimal position of the filament 1 in the measuring slot 52 of the compensation unit 5. The optimal height of the loop 56 sag depends on the properties of the material from which the filament 1 is made and is selected experimentally so that the weight of the material contained in the loop of the filament 1 facilitates the operation of the extraction rollers 31 of the extraction unit 3 The greater number of first height sensors 53 increases the precision of the winding regulation and the entire winder assembly 9. As more and more filament 1 is wound onto the spool 95, its winding speed is reduced, and a uniform winding speed is ensured through the compensation assembly 5 with the loop 56 of the filament 1 and optimal operation of the extraction unit of the 3rd technological line.

Thanks to well-set parameters of the technological line and the uniform operation of the extruder 2, the temperature and speed of filament 1 production are stabilized after several minutes, and the operation of the technological line is autonomous for many hours with minor corrections by the operator.

Typical filament 1 sizes are 1.75 mm and 2.8^3 mm. The maximum diameter of the produced filament 1 depends on the properties of the material and the parameters of the extruder 2.

List of markings

- filament

- extruder

- extraction unit

- compensation team

- measurement team

- winder

- nozzle

- extraction roller

- supporting beam

- first base

- cooling pipe

- fan

- regulator

- first column

- first panel

- first engine

- first driver

- first control module

- first display

- first rotary encoder

- first three-position button

- the first wireless module

- first antenna

- second column

- measuring gap

- first sensor

- transmitter

- receiver

- loop

- second control module

- transmitting path

- receiving track

- transmission cable

- optical indicator

- third column

- second panel

- guide roller

- vertical roller

- measuring component

- lower measuring roller

- upper measuring roller

- supporting profile

- base

- linear trolley

- second sensor

- third sensor

- arm

- sensor cable

- third control module

- second display

- second rotary encoder

- acoustic alarm

- second wireless module

- second antenna

- fourth column

- third panel

- rotating roller

- stacker

- spool

- pin

- blockade

- second engine

- second controller

100 - fourth control module

101 - left limit switch

102 - right limit switch

103 - third display

104 - third rotary encoder

105 - second three-position switch

106 - third wireless module

107 - third antenna

108 - transmission cable

109 - third engine

110 - third controller

111 - transport handle

112 - transport wheel

121 - inlet flow slot

122 - outlet flow slot

123 - upper bathtub

124 - fourth sensor

125 - pump

126 - tank

127 - inlet pipe

128 - lower bathtub

129 - drain pipe

130 - scraper

131 - pressure roller

Claims (7)

1. Technological line for the production of filament, with the following elements located along the cylindrical ribbon of the filament extruded from the extruder and arranged in the following order: an extraction unit for receiving the filament from the extruder, its extraction and diameter correction, a measuring unit for measuring the filament diameter and a winder unit for storing the finished filament on the spool , characterized in that it has a compensation unit (5) for the filament tension (1), located between the extraction unit (3) and the measuring unit (7), and a measuring gap (52) is created in the compensation unit (5) with a width equal to the minimum , the internal diameter of the nozzle (21) used in the extruder (2), and in addition, the compensation unit (5) has a set of at least three first height sensors (53) located at different heights, on opposite sides of the measurement gap (52) and detecting the vertical transition filament (1) through the first sensor (53), wherein the filament (1) is arranged in the form of a loop (56) placed inside the measuring slot (52) of the compensation unit (5), and the hanging height of the loop (56) of the filament (1) is maintained within the given limits. 2. Technological line according to claim 1, characterized in that it has a microprocessor second control module (57) placed in the compensation unit (5), which generates a square signal with a given frequency, different for each of the first sensors (53), in the infrared band invisible to humans, resistant to interference and the adjusted range to the infrared transmitter (54) and receiver (55) in the first height sensor (53), wherein this square signal with a given frequency is transmitted through the transmitting track wires (58), the first sensor (53) and the track wires receiving module (59) back to the second control module (57), where the transmitted and received frequencies are compared, and when the received frequency is disturbed by a given value, a signal is sent to report that the filament (1) has been cut in the first sensor (53) of the transmitter track (54). ) - receiver (55) and data with the number of the first sensor (53) are sent to the winder assembly (9) via the transmission cable (60), and the optical indicator (61) is activated. 3. Technological line according to claim 1 or 2, characterized in that the extraction unit (3) has air cooling of the filament (1). 4. Technological line according to claim 1 or 2, characterized in that the extraction unit (3) has water cooling of the filament (1). 5. A method of producing filament, using the technological line specified in claim. 1, in which a cylindrical ribbon of filament is extruded through nozzles from the extruder, collected and withdrawn from the extruder and cooled in the extraction unit with filament diameter correction, after which the diameter of the hardened filament is controlled in the measuring unit, and then the finished filament is wound and stored in the unit winder, characterized in that between the extraction unit (3) and the measuring unit (7) the filament (1) is laid in the form of a freely falling loop (56) with an overhang, and the height of the overhang of the loop (56) of the filament (1) is maintained in given limits. 6. The method according to claim 1. 5, characterized in that the height of the sag of the loop (56) of the filament (1) is controlled in the compensation unit (5). 7. The method according to claim 1. 5 or 6, characterized in that the height of the loop (56) of the filament (1) is adjusted by changing the speed of winding the finished filament (1) onto the spool (95) in the winder assembly (9).