A vacuum extraction device for a film extruder
By designing a vacuum device on the film extruder, and using humidity detection and a separator to extract water vapor, the problem of water vapor accumulation caused by the open-air storage of waste film was solved, thereby improving production efficiency and equipment lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG DECRO PACKAGE FILMS
- Filing Date
- 2025-06-24
- Publication Date
- 2026-05-29
AI Technical Summary
During the film production process, the waste film is stored in the open air and gets damp, which causes water vapor to accumulate, affecting the shape and tensile strength of the plastic strips, making them prone to breakage and reducing production efficiency and output.
Design a vacuum device for a film extruder, including a humidity detector, a vacuum pipe, a vacuum separator, a water suction pipe, and a control module. The humidity detector detects the humidity value, and the control module drives the vacuum separator to extract water vapor and water, separating them into wastewater and vacuum gas, which are then discharged outside the device to prevent water vapor from accumulating.
It effectively reduces moisture in the plastic strip, improves traction resistance, prevents breakage, increases production efficiency and output, and extends equipment life.
Smart Images
Figure CN224296539U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of film production technology, and in particular to a vacuum device for a film extruder. Background Technology
[0002] During the film production process, a certain amount of waste film, such as edge material, roll bottom film, and defective products, will be generated. These waste films can be granulated by a granulator to produce plastic granules for recycling. High-quality plastic granules can be fed into the film production line for continued use.
[0003] Waste materials such as scraps and waste film are typically stored outdoors and are prone to moisture absorption. During the production of recycled plastic pellets, the lack of cooling causes moisture to severely affect the shape of the plastic strips, reducing their tensile strength. Moisture accumulation at these points can easily lead to breakage, resulting in the plastic strips exiting the extruder die breaking and failing to form a continuous strip. This breakage significantly impacts production efficiency and output, while also increasing the workload for operators. Utility Model Content
[0004] The purpose of this invention is to provide a vacuum device for a film extruder to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.
[0005] To achieve the above objectives, some embodiments of this application provide a vacuuming device for a film extruder, the device comprising: a humidity detector, a vacuuming pipe, a vacuuming separator, a water suction pipe, a sewage discharge pipe, and a control module;
[0006] The film extruder is provided with a through hole, which is located on one side of the die head of the film extruder, and the vacuum pipe is connected to the film extruder through the through hole;
[0007] The humidity detector is installed on the vacuum pipe, the humidity detector is connected to the control module, and the control module is connected to the vacuum separator;
[0008] The humidity detector is used to detect the humidity value inside the film extruder, and the control module is used to drive the vacuum separator to operate when it is determined that the humidity value is greater than the set humidity value.
[0009] The first inlet of the vacuum separator is connected to the vacuum pipe, the second inlet of the vacuum separator is connected to the water suction pipe, and the outlet of the vacuum separator is connected to the sewage discharge pipe.
[0010] The vacuum separator is used to extract water vapor from the film extruder and water from the water suction pipe, and to separate wastewater and vacuum gas.
[0011] The sewage pipe is used to discharge the sewage and the vacuum gas.
[0012] Furthermore, the control module includes: a regulation unit, an AC / DC conversion unit, a relay, and a contactor;
[0013] The AC / DC conversion unit is connected to the control unit, the relay, and the contactor, respectively.
[0014] The control unit is connected to the humidity detector, the control unit is connected to the drive terminal of the relay, the switch of the relay is connected to the drive terminal of the contactor, and the switch of the contactor is connected to the vacuum separator.
[0015] Furthermore, the vacuuming device for the film extruder also includes: a water supply tank and a water supply pipeline;
[0016] The water replenishment tank is connected to the water intake pipe, and the water replenishment pipeline is connected to the water replenishment tank. The water replenishment pipeline is located on the top of the water replenishment tank and is used to replenish water to the water replenishment tank.
[0017] Furthermore, the water supply pipeline includes: an electric water supply valve, a manual water supply valve, a first water supply pipeline, and a second water supply pipeline;
[0018] The first water supply pipe is equipped with the electric water supply valve, and the water supply pipe is equipped with the manual water supply valve. One end of the first water supply pipe is connected to one end of the second water supply pipe, and the other end of the first water supply pipe is connected to the other end of the second water supply pipe.
[0019] Furthermore, the vacuum device used in the film extruder also includes: an overflow plate, a wastewater grid, and a drainage pipe;
[0020] The overflow plate is installed inside the water supply tank, with one end of the overflow plate facing the sewage pipe. The overflow plate is used to guide the sewage into the sewage compartment.
[0021] The wastewater compartment is connected to the overflow plate and the drainage pipe respectively. The drainage pipe is located at the bottom of the water supply tank and is used to discharge the wastewater drawn out by the wastewater compartment.
[0022] Furthermore, the sewage pipeline includes: a first sewage pipeline and a second sewage pipeline;
[0023] One end of the first sewage pipe and one end of the second sewage pipe are connected to the output port of the vacuum separator;
[0024] The other end of the first sewage pipe faces the water supply tank, and the first sewage pipe is used to discharge the sewage into the water supply tank;
[0025] The other end of the second sewage pipe faces the atmospheric environment, and the second sewage pipe is used to discharge the vacuum gas into the atmospheric environment.
[0026] Furthermore, the vacuum device for the film extruder also includes: a liquid level detector and a drive module;
[0027] The liquid level detector is installed on the inner wall of the water supply tank, the liquid level detector is connected to the drive module, and the drive module is connected to the electric water supply valve;
[0028] The liquid level detector is used to detect the current water level of the water replenishment tank, and the drive module is used to drive the electric water replenishment valve to open when it is determined that the current water level is lower than the set water level.
[0029] Furthermore, the vacuum device used in the film extruder also includes: a warning module;
[0030] The warning module is connected to the drive module, and the warning module is used to receive the prompt signal sent by the drive module and issue a warning signal.
[0031] Furthermore, the vacuum device used in the film extruder also includes: pipe flanges;
[0032] The pipe flange is welded to the through hole, and the pipe flange is connected to the vacuum pipe.
[0033] Furthermore, the drainage pipe is equipped with a drain valve, which is an electric drain valve.
[0034] The beneficial effects of this invention are as follows: A humidity detector can promptly detect moisture in the molten plastic at the die in the film extruder. Through a vacuum pipe, control module, and vacuum separator, the moisture trapped in the extruder barrel is extracted, drying the plastic strip, reducing moisture content, improving the strip's tensile strength, preventing breakage, and increasing production efficiency and output. Water is extracted from the suction pipe to clean the vacuum separator. After the extracted moisture mixes with water, it is separated into wastewater and vacuum gas at the separator's output. These are then discharged through a drain pipe, preventing the accumulation of plastic decomposition products or oil in the vacuum separator, which would otherwise reduce the device's lifespan. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the structure of a vacuum device for a film extruder according to an embodiment of the present invention;
[0036] Figure 2 This is a schematic diagram of the control module circuit of a vacuum device for a film extruder provided in one embodiment of the present invention;
[0037] Figure 3 This is a schematic diagram of the frame of a vacuum device for a film extruder provided in one embodiment of the present invention.
[0038] Reference numerals: Film extruder 100, Die head 110, Pipe flange 120, Humidity detector 200, Vacuum pipe 300, Vacuum separator 400, Vacuum pump motor 410, Water suction pipe 500, Sewage discharge pipe 600, First sewage discharge pipe 610, Second sewage discharge pipe 620, Water supply pipe 700, First water supply pipe 710, Electric water supply valve 711, Second water supply pipe 720, Manual water supply valve 721, Water supply tank 800, Liquid level detector 810, Drainage pipe 900, Electric drain valve 910, Control module 1000, Control unit 1001, AC / DC conversion unit 1002, Contactor KM, Relay K, Selector switch SW. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of this invention.
[0040] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.
[0041] Furthermore, it is understood that the terms "first," "second," etc., used in this application may be used herein to describe various concepts, but unless specifically stated otherwise, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more features. For example, without departing from the scope of embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words "if" or "when" as used herein may be interpreted as "in the event of," "when," or "in response to a determination."
[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0043] As described in the background section, in the prior art, a certain amount of waste film, such as edge material, roll bottom film, and defective products, is generated during the film production process. This waste film can be re-granulated by a granulator to produce plastic granules for recycling. High-quality plastic granules can be fed into the film production line for continued use. The waste film is fed into an extruder, heated in the barrel to become a molten colloid, extruded by a screw, and passed through a filter screen and die to form plastic strips. The plastic strips are cooled by cooling water, rapidly crystallize, and then cut into uniformly sized plastic granules by a pelletizer.
[0044] The filter screen in an extruder filters out impurities contained in the waste film. During production, the filter screen needs to be replaced regularly to prevent excessive extrusion pressure and maintain smooth and stable flow of the molten plastic. The die head has rows of small holes on its exit side. Their function is to shape the molten plastic passing through the die head into strips. By using different die head specifications, the cross-sectional area of the plastic strip can be changed, thus altering the size of the plastic particles.
[0045] In the production of recycled plastic pellets, the plastic strips exiting the die are prone to breakage at the die exit, failing to form a continuous strip. The reason for this is that the molten plastic strips contain moisture. Without cooling, this moisture severely affects the shape of the plastic strips, reducing their tensile strength and causing breakage at points of moisture accumulation. Since waste materials such as scraps and waste film are often stored outdoors, they are susceptible to moisture. If moisture is not promptly removed during processing, it remains trapped in the plastic strips, leading to breakage during traction. This breakage significantly impacts production efficiency and output, while also increasing the workload for operators.
[0046] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this utility model, a vacuum device for a film extruder includes: a control module 1000, a humidity detector 200, a vacuum pipe 300, a vacuum separator 400, a water suction pipe 500, and a sewage discharge pipe 600.
[0047] A through hole is provided on the barrel of the film extruder 100 near the die head 110, at one-third of the distance from the die head 110. A pipe flange 120 is welded to this through hole.
[0048] One end of the vacuum pipe 300 is connected to the cylinder of the film extruder 100 through a through hole welded with a pipe flange 120, and the other end of the vacuum pipe 300 is connected to the first inlet of the vacuum separator 400.
[0049] The humidity detector 200 is installed on one end of the vacuum pipe 300. The humidity detector 200 is close to the barrel of the film extruder 100. The humidity detector 200 is electrically connected to the input terminal of the control module 1000. The humidity detector 200 can detect the humidity inside the barrel of the film extruder 100, obtain the humidity value, and send the humidity value to the control module 1000.
[0050] In other words, if there is moisture in the waste film during the granulation process, it will form water vapor after being heated by the cylinder of the film extruder 100. After the humidity detector 200 in the vacuum pipe 300 detects the water vapor, it outputs a current signal of 4mA to 20mA to the control module 1000 to send the humidity value of 10% to 80% to the control module 1000.
[0051] The output terminal of the control module 1000 is electrically connected to the vacuum separator 400. The control module 1000 determines whether the humidity value sent is greater than the set humidity value. When it is determined that the humidity value is greater than the set humidity value, the control module 1000 outputs a drive signal to the vacuum separator 400 so that the vacuum separator 400 can run.
[0052] The vacuum separator 400 is provided with a first input port, a second input port, and an output port. The first input port is connected to the other end of the vacuum pipe 300, the second input port is connected to the water suction pipe 500, and the output port is connected to the discharge pipe.
[0053] Driven by the control module 1000, the vacuum separator 400 evacuates the film extruder 100 through its first input port, extracting trapped water vapor from the cylinder of the film extruder 100. Water is then extracted from the water suction pipe 500 through the second input port to clean the vacuum extruder. After the water vapor and water mix in the vacuum separator 400, they are separated into wastewater and vacuum gas at the output port. The wastewater contains plastic decomposition products or oil, and can float on the water surface.
[0054] The sewage pipe 600 discharges the separated sewage and vacuum gas through the outlet, preventing plastic decomposition products or oil stains from accumulating in the vacuum separator 400, which would reduce the service life of the device.
[0055] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the vacuum device further includes: a water supply tank 800, a water supply pipe 700, an overflow plate, a sewage grid, and a drainage pipe 900.
[0056] One end of the water suction pipe 500 is connected to the second inlet of the vacuum separator 400, and the other end of the water suction pipe 500 is connected to the water supply tank 800. When the vacuum separator 400 is suctioning, the water suction pipe 500 can supply the water stored in the water supply tank 800 to the vacuum extruder for cleaning.
[0057] The sewage pipe 600 discharges the separated sewage into the water replenishment tank 800 through the outlet.
[0058] One end of the water supply pipe 700 is connected to the water supply tank 800, and the other end of the water supply pipe 700 is connected to an external water supply line. The water supply pipe 700 is located on top of the water supply tank 800. The water supply pipe 700 can supply water from the external water supply line to the water supply tank 800 for water replenishment.
[0059] In other words, the external water supply line replenishes water to the water supply tank 800 through the water supply pipe 700, and the water supply tank 800 supplies water to the vacuum separator 400 for cleaning through the water suction pipe 500.
[0060] In one embodiment, the water supply pipeline 700 includes: a first water supply pipeline 710, an electric water supply valve 711, a second water supply pipeline 720, and a manual water supply valve 721. The first water supply pipeline 710 and the second water supply pipeline 720 are connected in parallel, with one end of the first water supply pipeline 710 connected to one end of the second water supply pipeline 720, and the other end of the first water supply pipeline 710 connected to the other end of the second water supply pipeline 720. The electric water supply valve 711 is installed on the first water supply pipeline 710, and the manual water supply valve 721 is installed on the second water supply pipeline 720. Automatic and manual water supply can be achieved through the electric water supply valve 711 and the manual water supply valve 721. The two valves are controlled in parallel, and when the electric water supply valve 711 malfunctions, the operator can temporarily open the manual water supply valve 721 to supply water.
[0061] An overflow plate is installed inside the water supply tank 800, with one end facing the drain pipe 600 and the other end facing the wastewater compartment. Wastewater discharged from the drain pipe 600 enters the water supply tank 800. Due to the composition of the wastewater, plastic decomposition products and oil will float on the surface. The overflow plate guides the wastewater floating on the surface into the wastewater compartment.
[0062] The wastewater filter can be installed inside the water supply tank 800. One end of the wastewater filter is connected to the overflow plate, and the other end is connected to the drain pipe 900. The wastewater filter can guide the wastewater introduced by the overflow plate into the drain pipe 900. The drain pipe 900 is installed at the bottom of the water supply tank 800 and can discharge the wastewater drawn out by the wastewater filter.
[0063] In one embodiment, a drain valve, which is an electric drain valve 910, is provided on the drain pipe 900.
[0064] The electric drain valve 910 and the electric water supply valve 711 can be solenoid valves.
[0065] In other words, the wastewater output from the vacuum separator 400 flows into the water supply tank 800 through the sewage pipe 600. Plastic decomposition products and oil float on the surface of the water in the water supply tank 800, flow through the overflow plate to the sewage grid, and are discharged through the drainage pipe 900.
[0066] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the vacuuming device further includes: a liquid level detector 810, a drive module, and an alarm module.
[0067] The liquid level detector 810 is installed inside the water supply tank 800. The liquid level detector 810 is electrically connected to the input terminal of the drive module, and the output terminal of the drive module is electrically connected to the warning module and the electric water supply valve 711 respectively.
[0068] The level monitor can detect the current water level stored in the water supply tank 800 and output the current water level to the drive module. The drive module can receive the current water level. Based on the transmitted current water level, if it is determined that the current water level is lower than the set water level, it considers the current water level in the water supply tank 800 to be too low. The control module 1000 outputs a drive signal to the electric water supply valve 711 and an alert signal to the warning module.
[0069] The electric water supply valve 711 opens according to the drive signal, connecting the first water supply pipe to supply water. The warning module operates according to the prompt signal, issuing a warning signal to prompt the water supply tank 800 to supply water.
[0070] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the sewage pipe 600 includes: a first sewage pipe 610 and a second sewage pipe 620.
[0071] One end of the first sewage pipe 610 is connected to the output port of the vacuum separator 400, and the other end of the first sewage pipe 610 faces the water replenishment tank 800. The first sewage pipe 610 can discharge sewage into the water replenishment tank 800, so that the sewage can float on the water surface of the water replenishment tank 800.
[0072] One end of the second sewage pipe 620 is connected to the output port of the vacuum separator 400, and the other end of the second sewage pipe 620 faces the atmospheric environment. The second sewage pipe 620 can discharge the vacuum gas to the atmospheric environment.
[0073] In other words, after the vacuum separator 400 mixes the extracted water vapor and water, the wastewater and vacuum gas are separated and output at the output port of the vacuum separator 400. The gas is discharged into the atmosphere, and the wastewater is discharged into the water replenishment tank 800.
[0074] Reference Figure 1 and Figure 2 In some embodiments of this utility model, the control module 1000 includes: a contactor KM, a relay K, a control unit 1001, a selector switch SW, and an AC / DC conversion unit 1002.
[0075] The input terminal of the AC / DC conversion unit 1002 is electrically connected to an external AC power source, and the output terminal of the AC / DC conversion unit 1002 is electrically connected to the contactor KM, the relay K, the control unit 1001, and the selector switch SW, respectively, to supply power to the contactor KM, the relay K, the control unit 1001, and the selector switch SW.
[0076] AC / DC conversion unit 1002 can convert the input external AC power into 24V DC power to supply power to contactor KM, relay K, control unit 1001 and selector switch SW.
[0077] The contactor KM is electrically connected to the vacuum pump motor 410 in the vacuum separator 400. The drive terminal of the contactor KM is also electrically connected to the relay K, and the drive terminal of the contactor KM is also electrically connected to the selector switch SW. In other words, the relay K and the selector switch SW are connected in parallel.
[0078] The drive terminal of relay K is electrically connected to the output terminal of control unit 1001, and the output terminal of control unit 1001 is electrically connected to humidity detector 200.
[0079] In other words, if there is moisture in the waste film during the granulation process, it will form water vapor after being heated by the cylinder of the film extruder 100. After the humidity detector 200 in the vacuum pipe 300 detects the water vapor, it outputs a current signal of 4mA to 20mA to the control unit 1001 to send the humidity value of 10% to 80% to the control unit 1001.
[0080] The control unit 1001 determines whether the humidity value sent is greater than the set humidity value. When it is determined that the humidity value is greater than the set humidity value, the control unit 1001 turns on the driving terminal of the relay K, turns on the switch of the relay K, turns on the driving terminal of the contactor KM, turns on the switch of the contactor KM, and powers on the vacuum pump motor 410 in the vacuum separator 400 so that the vacuum separator 400 can perform suction.
[0081] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A vacuum device for a film extruder, characterized in that, include: Humidity detector, vacuum piping, vacuum separator, water suction piping, sewage discharge piping and control module; The film extruder is provided with a through hole, which is located on one side of the die head of the film extruder, and the vacuum pipe is connected to the film extruder through the through hole; The humidity detector is installed on the vacuum pipe, the humidity detector is connected to the control module, and the control module is connected to the vacuum separator; The humidity detector is used to detect the humidity value inside the film extruder, and the control module is used to drive the vacuum separator to operate when it is determined that the humidity value is greater than the set humidity value. The first inlet of the vacuum separator is connected to the vacuum pipe, the second inlet of the vacuum separator is connected to the water suction pipe, and the outlet of the vacuum separator is connected to the sewage discharge pipe. The vacuum separator is used to extract water vapor from the film extruder and water from the water suction pipe, and to separate wastewater and vacuum gas. The sewage pipe is used to discharge the sewage and the vacuum gas.
2. The vacuum device for a film extruder according to claim 1, characterized in that, The control module includes: a control unit, an AC / DC conversion unit, relays, and contactors; The AC / DC conversion unit is connected to the control unit, the relay, and the contactor, respectively. The control unit is connected to the humidity detector, the control unit is connected to the drive terminal of the relay, the switch of the relay is connected to the drive terminal of the contactor, and the switch of the contactor is connected to the vacuum separator.
3. The vacuum device for a film extruder according to claim 1, characterized in that, Also includes: Water supply tank and water supply pipeline; The water replenishment tank is connected to the water intake pipe, and the water replenishment pipeline is connected to the water replenishment tank. The water replenishment pipeline is located on the top of the water replenishment tank and is used to replenish water to the water replenishment tank.
4. The vacuum device for a film extruder according to claim 3, characterized in that, The water supply pipeline includes: an electric water supply valve, a manual water supply valve, a first water supply pipeline, and a second water supply pipeline; The first water supply pipe is equipped with the electric water supply valve, and the water supply pipe is equipped with the manual water supply valve. One end of the first water supply pipe is connected to one end of the second water supply pipe, and the other end of the first water supply pipe is connected to the other end of the second water supply pipe.
5. The vacuum device for a film extruder according to claim 3, characterized in that, Also includes: Overflow panels, wastewater filters, and drainage pipes; The overflow plate is installed inside the water supply tank, with one end of the overflow plate facing the sewage pipe. The overflow plate is used to guide the sewage into the sewage compartment. The wastewater compartment is connected to the overflow plate and the drainage pipe respectively. The drainage pipe is located at the bottom of the water supply tank and is used to discharge the wastewater drawn out by the wastewater compartment.
6. The vacuum device for a film extruder according to claim 3, characterized in that, The sewage pipeline includes: a first sewage pipeline and a second sewage pipeline; One end of the first sewage pipe and one end of the second sewage pipe are connected to the output port of the vacuum separator; The other end of the first sewage pipe faces the water supply tank, and the first sewage pipe is used to discharge the sewage into the water supply tank; The other end of the second sewage pipe faces the atmospheric environment, and the second sewage pipe is used to discharge the vacuum gas into the atmospheric environment.
7. The vacuum device for a film extruder according to claim 4, characterized in that, Also includes: Liquid level detector and drive module; The liquid level detector is installed on the inner wall of the water supply tank, the liquid level detector is connected to the drive module, and the drive module is connected to the electric water supply valve; The liquid level detector is used to detect the current water level of the water replenishment tank, and the drive module is used to drive the electric water replenishment valve to open when it is determined that the current water level is lower than the set water level.
8. The vacuum device for a film extruder according to claim 7, characterized in that, Also includes: Warning module; The warning module is connected to the drive module, and the warning module is used to receive the prompt signal sent by the drive module and issue a warning signal.
9. The vacuum device for a film extruder according to claim 1, characterized in that, Also includes: Pipe flanges; The pipe flange is welded to the through hole, and the pipe flange is connected to the vacuum pipe.
10. The vacuum device for a film extruder according to claim 5, characterized in that, The drainage pipe is equipped with a drain valve, which is an electric drain valve.