PETG (polyethylene terephthalate glycol) film extrusion device

Abstract

The utility model 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] The present application relates to the technical field of plastic film production equipment, and in particular to a PETG film extrusion device. Background Art

[0002] Since most of the PETG products on the market are thicker sheets, there are many crystal points and bubbles inside the PETG products after production and molding, and the products are not beautiful and of low quality. Some equipment also adds a dehumidification dryer to eliminate bubbles and crystal points, but the cost is relatively high. Summary of the invention

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

[0004] To achieve the above purpose, the present application adopts the following technical solution: a PETG film extrusion device, comprising:

[0005] A parallel dual main machine, comprising a feed port for receiving materials and a discharge port for discharging materials, wherein the discharge port is located downstream of the feed port, and an exhaust port for discharging excess gas in the extruder is also provided between the discharge port and the feed port;

[0006] A dust removal system, connected to the feed inlet and located upstream of the feed inlet;

[0007] a vacuum system, connected to the exhaust port, the vacuum system being configured to generate a suction negative pressure at the exhaust port;

[0008] An extrusion die, connected to the discharge port and located downstream of the discharge port;

[0009] a filtering system, disposed between the discharge port and the extrusion die, the filtering system comprising at least two filtering elements; and

[0010] The controller is connected to the flat dual host, the dust removal system, the vacuum system, the extrusion die and the filtering system.

[0011] In the above technical solution, it is further preferred that a suction machine and a feeder are respectively provided upstream and downstream of the dust removal system, and the feeder is connected between the dust removal system and the feed port.

[0012] In the above technical solution, it is further preferred that the dust removal system includes a hair dryer for outputting flowing air, and the hair dryer is connected to the controller signal.

[0013] In the above technical solution, it is further preferred that an exhaust chamber is provided between the vacuum system and the exhaust port, and an anti-material leakage structure is provided in the exhaust chamber.

[0014] In the above technical solution, it is further preferred 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.

[0015] In the above technical solution, it is further preferred that a metering pump is arranged between the extrusion die and the discharge port, the metering pump is connected to the controller signal, and the metering pump is configured to adjust the flow rate of the material delivered from the discharge port to the extrusion die under the control of the controller.

[0016] In the above technical solution, it is further preferred that the filtration system includes a screen changer and a long-acting filter, the screen changer is connected between the metering pump and the discharge port, and the long-acting filter is connected between the metering pump and the extrusion die.

[0017] In the above technical solution, it is further preferred that the screen changer and the long-lasting filter are connected to the controller signal.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present application filters dust, gas and impurities in the material multiple times through a dust removal system, a vacuum system, and a screen changer and a long-lasting filter in the filtration system, so that the material entering the extrusion die is completely free of dust and impurities, ensuring that the film extruded by the extrusion die is free of crystal points and bubbles. The extrusion device has a simple structure, saves costs, and improves the appearance and quality of the product, and is particularly suitable for the production of PETG film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front view of a PETG film extrusion device provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A top view of the extrusion device in FIG.

[0022] Among them: 100, extrusion device; 1, flat double host; 2, dust removal system; 3, vacuum system; 4, extrusion mold; 5, suction machine; 6, feeder; 7, exhaust chamber; 8, metering pump; 9, screen changer; 10, long-term filter. DETAILED DESCRIPTION

[0023] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the 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 shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0024] The “upstream” and “downstream” mentioned in this application refer to the flow direction of the material in the extrusion device, and the material is transported from the upstream to the downstream in the extrusion device.

[0025] The embodiment of the present application provides a PETG film extrusion device, which is particularly suitable for the production of PETG film, effectively eliminating bubbles and crystal points in the PETG film, and improving the quality of the product. Figure 1 As shown, the extrusion device 100 includes a flat double main machine 1, a dust removal system 2 arranged upstream of the flat double main machine 1, a vacuum system 3 arranged on one side of the flat double main machine 1, an extrusion die 4 arranged downstream of the flat double main machine 1, a filtering system arranged between the flat double main machine 1 and the extrusion die 4, and a controller (not shown in the figure).

[0026] The flat double main machine 1 includes a barrel and an extrusion screw rotatably arranged in the barrel. The barrel is provided with a feed port for inputting materials and a discharge port for outputting materials. The barrel wall is also provided with an exhaust port for exhausting excess gas in the barrel, and the exhaust port is located between the feed port and the discharge port. The material enters the barrel from the feed port, and is stirred and sheared by the extrusion screw to plasticize the material into a melt. When the material is heated, a large amount of gas is generated, and the gas is discharged from the barrel from the exhaust port. The fully plasticized material is output from the flat double main machine 1 from the discharge port. The flat double main machine 1 is connected to a controller, and the controller controls the speed of the extrusion screw.

[0027] The dust removal system 2 is connected to the feed port to remove dust from the material input into the feed port; the dust removal system 2 includes a blower (not shown in the figure) that outputs flowing air. The blower blows out flowing air to blow dust from the material away from the material. The blower is connected to the controller signal, and the controller controls the start and stop of the blower and the output wind speed.

[0028] A suction machine 5 is provided upstream of the dust removal system 2, and the suction machine 5 is used to provide conveying power for the material conveyed to the dust removal system 2 to improve the feeding efficiency of the extrusion device 100. A feeder 6 is provided between the dust removal system 2 and the feed port, and the feeder 6 is used to adjust the flow rate of the material conveyed to the feed port. The suction machine 5 and the feeder 6 are both connected to the controller, and the controller controls the conveying speed and the material discharge flow rate to control the feeding amount of the flat double host 1 and improve the production efficiency of the flat double host 1.

[0029] The suction machine 5, the dust removal system 2, the feeder 6, the flat double main machine 1 and the extrusion die 4 are fluidly connected in sequence, and the material is transported along the suction machine 5, the dust removal system 2, the feeder 6, the flat double main machine 1 and the extrusion die 4 in sequence.

[0030] like Figure 1 , 2 As shown, the vacuum system 3 is connected to the exhaust port of the flat double main machine 1, and an exhaust chamber 7 is provided between the vacuum system 3 and the exhaust port. The vacuum system 3 loads 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 temperature rise of the material in the barrel are sucked into the vacuum system 3 from the exhaust port, so as to prevent the residual gas and dust in the material from forming bubbles and crystal points in the film when the material is extruded into a film, thereby affecting 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 material in the barrel. An anti-material overflow structure (not shown in the figure) is provided in the exhaust chamber 7, which effectively prevents the material from entering the vacuum system 3 from the exhaust port under the strong suction of the vacuum system 3, avoids the loss of the material and the damage of the vacuum system 3, and further improves the suction efficiency of the vacuum system 3.

[0031] The extrusion die 4 is connected to the discharge port, and is used to extrude the material output by the flat dual host 1 into a film. A metering pump 8 is arranged between the extrusion die 4 and the discharge port, and the metering pump 8 is connected to the controller signal. Under the control of the controller, the metering pump 8 adjusts the flow rate of the material delivered from the discharge port to the extrusion die 4, controls the delivery of the material, increases the stability of the material entering the extrusion die 4, and effectively improves the extrusion quality of the extrusion die 4.

[0032] Continue to refer to Figure 1 and Figure 2, the filtering system filters the unmelted solids and impurities in the material between the extrusion die 4 and the discharge port to avoid the formation of crystal points in the extruded film, and the filtering system includes at least two filtering elements to filter the material output from the discharge port twice. In the embodiment of the present application, the filtering system includes two filtering elements, the two filtering elements are a screen changer 9 and a 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 remove the impurities and dust in the material entering the extrusion die 4, and ensure that there are no crystal points and bubbles in the film extruded by the extrusion die 4.

[0033] Flow monitoring elements (not shown in the figure) are provided upstream and downstream of the screen changer 9 and the long-term filter 10. The flow monitoring elements are connected to the controller signal. The controller monitors whether the screen changer 9 and the long-term filter 10 are blocked according to the real-time flow feedback from the flow monitoring elements. When the corresponding filter element is detected to be blocked, the 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 to avoid affecting the extrusion efficiency due to blockage by impurities.

[0034] The present application removes dust from the input material through the dust removal system 2 upstream of the flat double main machine 1, and then uses the vacuum system 3 to suck the gas and dust generated during the extrusion process, and finally uses the screen changer 9 and the long-lasting filter 10 in the filtering system to filter the impurities and dust of 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 is free of crystal points and bubbles. The extrusion device has a simple structure, saves costs, and improves the appearance and quality of the product, and is particularly suitable for the production of PETG film.

[0035] 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, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A PETG film extrusion device, characterized in that, include: A parallel dual main machine, comprising a feed port for receiving materials and a discharge port for discharging materials, wherein the discharge port is located downstream of the feed port, and an exhaust port for discharging excess gas in the extrusion device is also provided between the discharge port and the feed port; A dust removal system, connected to the feed inlet and located upstream of the feed inlet; a vacuum system, connected to the exhaust port, the vacuum system being configured to generate a suction negative pressure at the exhaust port; An extrusion die, connected to the discharge port and located downstream of the discharge port; A filtering system, arranged between the discharge port and the extrusion die, the filtering system comprising at least two filtering elements; as well as The controller is connected to the flat dual host, the dust removal system, the vacuum system, the extrusion die and the filtering system.

2. A PETG film extrusion device according to claim 1, characterized in that, A 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.

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

4. A 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-material leakage structure is arranged in the exhaust chamber.

5. A 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. A PETG film extrusion device according to claim 1, characterized in that, A metering pump is provided between the extrusion die and the discharge port, the metering pump is connected to the controller signal, and the metering pump is configured to adjust the flow rate of the material delivered from the discharge port to the extrusion die under the control of the controller.

7. A PETG film extrusion device according to claim 6, characterized in that, The filtering system comprises a screen changer and a long-acting filter. The screen changer is connected between the metering pump and the discharge port, and the long-acting filter is connected between the metering pump and the extrusion die.

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

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