PETG (polyethylene terephthalate glycol) film extrusion device

Abstract

The invention discloses a PETG (polyethylene terephthalate glycol) film extrusion device which comprises a flat double main machine with an exhaust port, a dust removal system located at the upstream of the flat double main machine, an extrusion die located at the downstream of the flat double main machine, a vacuum system communicated with the exhaust port, a filtering system arranged between the flat double main machine and the extrusion die and a controller. The dust removal system is communicated with the feed port, and the extrusion die is communicated with the discharge port; the filtering system comprises at least two filtering elements; and the controller is in control connection with the flat double hosts, the dust removal system, the vacuum system, the extrusion die and the filtering system. Dust, gas and impurities in materials are filtered for multiple times through the dust removal system, the vacuum system and the filtering system, dust and impurities in the materials entering the extrusion die are completely removed, it is guaranteed that a film extruded by the extrusion die is free of crystal points and bubbles, the extrusion device is simple in structure, cost is saved, the attractiveness and quality of products are improved, and the production cost is reduced. The method is especially suitable for production of PETG films.

Description

Technical Field

[0001] This application relates to the technical field of plastic film production equipment, and particularly to a PETG film extrusion device. Background Art

[0002] Since most PETG products on the market are relatively thick sheets, there are many crystal point bubbles inside the PETG products after production and molding, making the products unsightly and of low quality; some devices also add dehumidifying dryers to eliminate bubbles and crystal points, but the cost is relatively high. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of this application is to provide a PETG film extrusion device.

[0004] To achieve the above object, this application adopts the following technical solutions: A PETG film extrusion device includes: A twin-screw extruder host, including a feed inlet for receiving materials and a discharge outlet for discharging materials, the discharge outlet is located downstream of the feed inlet, and an exhaust port for discharging excess gas in the extruder is further provided between the discharge outlet and the feed inlet; A dust removal system, connected to the feed inlet and located upstream of the feed inlet; A vacuum system, connected to the exhaust port, and the vacuum system is configured to generate a suction negative pressure at the exhaust port; An extrusion die, connected to the discharge outlet and located downstream of the discharge outlet; A filtration system, arranged between the discharge outlet and the extrusion die, and the filtration system includes at least two filter elements; and A controller, which is control-connected to the twin-screw extruder host, the dust removal system, the vacuum system, the extrusion die and the filtration system.

[0005] In the above technical solution, further preferably, a material suction machine and a feeder are respectively arranged upstream and downstream of the dust removal system, and the feeder is connected between the dust removal system and the feed inlet.

[0006] In the above technical solution, further preferably, the dust removal system includes a blower for outputting flowing air, and the blower is signal-connected to the controller.

[0007] In the above technical solution, further preferably, an exhaust chamber is arranged between the vacuum system and the exhaust port, and an anti-overflow structure is arranged in the exhaust chamber.

[0008] In the above technical solution, further preferably, the vacuum system is a three-stage vacuum system, and the three-stage vacuum system includes three vacuum ports communicated with the exhaust chamber.

[0009] In the above technical solution, further preferably, a metering pump is arranged between the extrusion die and the discharge port. The metering pump is in signal connection with the controller, and the metering pump is configured to adjust the flow rate of the material conveyed from the discharge port to the extrusion die under the control of the controller.

[0010] In the above technical solution, further preferably, the filtration system includes a screen changer and a long-term filter. The screen changer is connected between the metering pump and the discharge port, and the long-term filter is connected between the metering pump and the extrusion die.

[0011] In the above technical solution, further preferably, the screen changer and the long-term filter are in signal connection with the controller.

[0012] The present application has the following beneficial effects compared with the prior art: In the present application, the screen changer and the long-term filter in the dust removal system, the vacuum system and the filtration system are used to filter the dust, gas and impurities in the material multiple times, so that the material entering the extrusion die is completely free of dust and impurities, ensuring that the film extruded by the extrusion die has no crystal points and bubbles. The extrusion device has a simple structure, saves costs, and improves the appearance and quality of the product, and is especially suitable for the production of PETG films. Description of the Drawings

[0013] Figure 1 It is the front view of an extrusion device for PETG films provided by an embodiment of the present application; Figure 2 It is Figure 1 the top view of the extrusion device in Wherein: 100, extrusion device; 1, twin-screw extruder; 2, dust removal system; 3, vacuum system; 4, extrusion die; 5, loader; 6, feeder; 7, exhaust chamber; 8, metering pump; 9, screen changer; 10, long-term filter. Detailed Embodiments

[0014] To describe in detail the technical content, structural features, achieved objectives and effects of the application, the technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment.

[0015] As used in this application, "upstream" and "downstream" refer to the flow direction of the material in the extrusion device, and the material is conveyed from upstream to downstream in the extrusion device.

[0016] The embodiment of the present application provides a PETG film extrusion device, which is particularly suitable for the production of PETG films, effectively eliminating bubbles and crystal points in the PETG films and improving the product quality. As Figure 1 shown, the extrusion device 100 includes a twin-screw extruder 1, a dust removal system 2 provided upstream of the twin-screw extruder 1, a vacuum system 3 provided on one side of the twin-screw extruder 1, an extrusion die 4 provided downstream of the twin-screw extruder 1, a filtration system arranged between the twin-screw extruder 1 and the extrusion die 4, and a controller (not shown in the figure).

[0017] The twin-screw extruder 1 includes a barrel and an extrusion screw rotatably arranged in the barrel. The barrel is provided with a feed inlet for feeding materials and a discharge outlet for discharging materials. An exhaust port for discharging excess gas in the barrel is also provided on the barrel wall, and the exhaust port is located between the feed inlet and the discharge outlet. The material enters the barrel from the feed inlet and is stirred and sheared by the extrusion screw to be plasticized into a molten material. A large amount of gas is generated after the material is heated, and the gas is discharged from the barrel through the exhaust port. The fully plasticized material is discharged from the discharge outlet of the twin-screw extruder 1. The twin-screw extruder 1 is connected to the controller, and the rotation speed of the extrusion screw is controlled by the controller.

[0018] The dust removal system 2 is communicated with the feed inlet to remove dust in the material input into the feed inlet; the dust removal system 2 includes a blower (not shown in the figure) for outputting flowing air. The blower blows out the flowing air to blow the dust in the material away from the material. The blower is signal-connected to the controller, and the start-stop and output air speed of the blower are controlled by the controller.

[0019] Upstream of the dust removal system 2, there is a material suction machine 5, which is used to provide conveying power for the materials conveyed to the dust removal system 2, so as to improve the feeding efficiency of the extrusion device 100. Between the dust removal system 2 and the feeding port, there is a feeder 6, which is used to adjust the flow rate of the materials conveyed to the feeding port. Both the material suction machine 5 and the feeder 6 are connected to the controller for control. The controller controls the conveying speed and the discharging flow rate to control the feeding amount of the double-screw main machine 1 and improve the production efficiency of the double-screw main machine 1.

[0020] The material suction machine 5, the dust removal system 2, the feeder 6, the double-screw main machine 1 and the extrusion die 4 are successively in fluid communication, and the materials are conveyed successively along the material suction machine 5, the dust removal system 2, the feeder 6, the double-screw main machine 1 and the extrusion die 4.

[0021] As Figure 1 、 2 shown, the vacuum system 3 is connected to the exhaust port of the double-screw main machine 1. Between the vacuum system 3 and the exhaust port, there is an exhaust chamber 7. The vacuum system 3 applies a suction negative pressure at the exhaust chamber 7 and the exhaust port, so that a large amount of gas and floating dust generated by the heating of the materials in the barrel are sucked from the exhaust port into the vacuum system 3, avoiding the formation of bubbles and crystal points in the film when the materials in the film are extruded, which affects the appearance and quality of the final product. The vacuum system 3 is a three-stage vacuum system, including three vacuum ports connected to the exhaust chamber 7, so as to improve the suction efficiency of the gas and further reduce the probability of residual gas in the materials in the barrel. An anti-overflow structure (not shown in the figure) is arranged in the exhaust chamber 7. This anti-overflow structure effectively prevents the materials from entering the vacuum system 3 from the exhaust port under the strong suction of the vacuum system 3, avoiding the loss of materials and the damage of the vacuum system 3, and further improving the suction efficiency of the vacuum system 3.

[0022] The extrusion die 4 is connected to the discharging port and is used to extrude the materials output by the double-screw main machine 1 into a film. Between the extrusion die 4 and the discharging port, there is a metering pump 8. The metering pump 8 is signal-connected to the controller. The metering pump 8 adjusts the flow rate of the materials conveyed from the discharging port to the extrusion die 4 under the control of the controller, controls the conveying of the materials, increases the stability of the materials entering the extrusion die 4, and effectively improves the extrusion quality of the extrusion die 4.

[0023] Continue to refer to Figure 1 and Figure 2, the filtration system filters the uncompletely melted solids and impurities in the material between the extrusion die 4 and the discharge port to avoid forming crystal points in the extruded film. The filtration system includes at least two filtration elements to filter the material output from the discharge port twice. In the embodiment of the present application, the filtration system includes two filtration elements, which are the screen changer 9 and the long-term filter 10. The screen changer 9 is connected between the discharge port and the inlet of the metering pump 8 and is used to filter the impurities and dust in the plasticized material output from the discharge port; the long-term filter 10 is connected between the outlet of the metering pump 8 and the inlet of the extrusion die 4 and is used to further filter the impurities and dust in the plasticized material, completely removing the impurities and dust in the material entering the extrusion die 4 and ensuring that there are no crystal points and bubbles in the film extruded by the extrusion die 4.

[0024] Flow monitoring elements (not shown in the figure) are arranged upstream and downstream of the screen changer 9 and the long-term filter 10. The flow monitoring elements are signal-connected to the controller. The controller monitors whether the screen changer 9 and the long-term filter 10 are blocked according to the real-time flow rate fed back by the flow monitoring elements. When it is detected that the corresponding filtration element is blocked, an alarm element is used to warn the staff to notify the staff to change the screen of the screen changer 9 or maintain the long-term filter 10, so as to avoid affecting the extrusion efficiency due to impurity blockage.

[0025] In this application, the dust removal system 2 upstream of the flat double main machine 1 is used to remove dust from the input material, and then the vacuum system 3 is used to suck the gas and dust generated during the extrusion process. Finally, the screen changer 9 and the long-term filter 10 in the filtration system are used to filter the impurities and dust in the material output by the flat double main machine 1 again, so that the material entering the extrusion die 4 is completely free of dust and impurities, ensuring that the film extruded by the extrusion die 4 has no crystal points and bubbles. This extrusion device has a simple structure, saves costs, and improves the appearance and quality of the product, and is especially suitable for the production of PETG films.

[0026] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements. The scope of protection required by the present application is defined by the appended claims, the specification and their equivalents.

Claims

1. A PETG film extrusion device, characterized in that, it comprises: A twin-screw extruder main unit, including a feed inlet for receiving materials and a discharge outlet for discharging materials, the discharge outlet is located downstream of the feed inlet, and an exhaust port for discharging excess gas in the extruder is further provided between the discharge outlet and the feed inlet; A dust removal system, which is connected to the feed inlet and is located upstream of the feed inlet; A vacuum system, which is connected to the exhaust port, and the vacuum system is configured to generate a suction negative pressure at the exhaust port; An extrusion die, which is connected to the discharge outlet and is located downstream of the discharge outlet; A filtration system, which is arranged between the discharge outlet and the extrusion die, and the filtration system includes at least two filter elements; and A controller, which is connected to the twin-screw extruder main unit, the dust removal system, the vacuum system, the extrusion die and the filtration system for control connection.

2. The PETG film extrusion device according to claim 1, characterized in that, A suction feeder and a feeding machine are respectively arranged upstream and downstream of the dust removal system, and the feeding machine is connected between the dust removal system and the feed inlet.

3. The PETG film extrusion device according to claim 1, characterized in that, The dust removal system includes a blower for outputting flowing air, and the blower is signal-connected to the controller.

4. The PETG film extrusion device according to claim 1, characterized in that, An exhaust chamber is arranged between the vacuum system and the exhaust port, and an anti-overflow structure is arranged in the exhaust chamber.

5. The PETG film extrusion device according to claim 4, characterized in that, The vacuum system is a three-stage vacuum system, and the three-stage vacuum system includes three vacuum ports connected to the exhaust chamber.

6. The PETG film extrusion device according to claim 1, characterized in that, A metering pump is arranged between the extrusion die and the discharge outlet, the metering pump is signal-connected to the controller, and the metering pump is configured to adjust the flow rate of the materials conveyed from the discharge outlet to the extrusion die under the control of the controller.

7. The PETG film extrusion device according to claim 6, characterized in that, The filtration system includes a screen changer and a long-term filter, the screen changer is connected between the metering pump and the discharge outlet, and the long-term filter is connected between the metering pump and the extrusion die.

8. The PETG film extrusion device according to claim 7, characterized in that, The screen changer and the long-term filter are signal-connected to the controller.

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