A production process of PVC calendering film

Abstract

The application relates to a PVC calendering film production process and belongs to the technical field of PVC calendering films. The process comprises the steps of feeding, extruding, forming, cooling, edge cutting and winding. In the cooling step, a first-stage cooling roller, a second-stage cooling roller and a third-stage cooling roller are arranged, the cooling temperatures of the first-stage cooling roller, the second-stage cooling roller and the third-stage cooling roller are sequentially reduced, and a control system is arranged in the cooling step. The control system comprises a temperature measuring module, a temperature control module, a temperature reducing module and a notification module. The temperature measuring module is used for detecting the temperature of the first-stage cooling roller and sending the temperature to the temperature reducing module. After receiving the temperature sent by the temperature measuring module, the temperature reducing module performs difference operation to obtain the corresponding temperatures of the second-stage cooling roller and the third-stage cooling roller and sends the temperatures to the temperature control module. The temperature control module adjusts the temperatures of the second-stage cooling roller and the third-stage cooling roller according to the temperatures. The application has the advantages that the temperatures of the cooling rollers can be controlled, and the probability that the produced PVC calendering film does not meet the requirements is reduced.

Description

Technical Field

[0001] This application relates to the technical field of PVC calendered film, and in particular to a PVC calendered film production process. Background Technology

[0002] The production of PVC calendered film includes the following steps: feeding, extrusion, forming, cooling, edge trimming, and winding. In the cooling step, poor temperature control can lead to substandard PVC calendered film. Chinese invention patent CN103144236A discloses a PVC calendered film production process, which uses three sets of cooling rollers with progressively decreasing temperatures. This ensures effective cooling; however, if the temperature of a later roller is higher than that of a previous roller, the PVC calendered film may fail to meet requirements. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, one of the objectives of this application is to provide a PVC calendered film production process, which has the advantage of being able to control the temperature of the cooling rollers and reducing the probability of the produced PVC calendered film not meeting the requirements.

[0004] The above-mentioned objective of this application is achieved through the following technical solution:

[0005] A PVC calendered film production process includes the following steps: feeding, extrusion, forming, cooling, edge trimming, and winding. The cooling step includes a primary cooling roller, a secondary cooling roller, and a tertiary cooling roller, with the cooling temperatures of the primary, secondary, and tertiary cooling rollers decreasing sequentially. A control system is employed in the cooling step, comprising a temperature measuring module, a temperature control module, a cooling module, and a notification module. The temperature measuring module detects the temperature of the primary cooling roller and sends it to the cooling module. Upon receiving the temperature from the temperature measuring module, the cooling module performs a difference calculation to determine the temperatures corresponding to the secondary and tertiary cooling rollers, and sends this result to the temperature control module. The temperature control module adjusts the temperatures of the secondary and tertiary cooling rollers based on the temperatures sent by the cooling module. Upon receiving the temperature from the temperature measuring module, the cooling module judges whether the temperature falls within the standard temperature range and sends a notification signal to the notification module. The notification module then issues a notification upon receiving the signal.

[0006] By adopting the above technical solution, during the cooling process, the temperature of the highest cooling roller and the temperature of the cooling roller are detected, and the difference is calculated based on the detection results to obtain the corresponding temperatures of the secondary and tertiary cooling rollers. The temperature of the secondary and tertiary cooling rollers is then adjusted by the temperature control module. Therefore, the temperatures of the secondary and tertiary cooling rollers are related to the temperature of the primary cooling roller, which can effectively reduce the probability that the temperature of the later set of cooling rollers is higher than that of the earlier set of cooling rollers. This reduces the probability that the produced PVC calendered film will not meet the requirements.

[0007] In a preferred embodiment, this application may be further configured such that: the outlet pipe of the third-stage cooling roller is connected to the inlet pipe of the second-stage cooling roller, the outlet pipe of the second-stage cooling roller is connected to the inlet pipe of the first-stage cooling roller, the outlet pipe of the first-stage cooling roller is connected to the inlet pipe of the third-stage cooling roller, and a temperature regulating device is provided on the inlet pipes of the first-stage cooling roller, the second-stage cooling roller, and the third-stage cooling roller.

[0008] By adopting the above technical solution, the liquid inside the cooling roller will heat up after the cooling roller comes into contact with the product. Therefore, the liquid in the third-stage cooling roller is transported to the inlet of the second-stage cooling roller, thereby reducing the energy consumption required to heat the liquid.

[0009] In a preferred embodiment, the present application may be further configured such that the temperature control device includes a temperature control tube, which is sleeved on the water inlet pipe and forms a cavity with the outer wall of the water inlet pipe, the cavity being filled with a heat-conducting liquid.

[0010] By adopting the above technical solution, the presence of the temperature control tube allows the temperature of the liquid to be adjusted according to actual needs.

[0011] In a preferred embodiment, this application can be further configured as follows: the temperature regulating device further includes an inlet water pipe and a outlet water pipe, both of which are connected to the temperature regulating pipe. The inlet water pipe and the temperature regulating pipe are connected on one side, and the outlet water pipe and the temperature regulating pipe are connected on the other side. The inlet water pipe is also provided with a return pipe one and a return pipe two, both of which are connected to the temperature regulating pipe. Each of the return pipe one and the return pipe two is provided with a valve one. The inlet water pipe is also provided with a valve two. The connection point between the return pipe one and the inlet water pipe is called connection point one, and the connection point between the return pipe two and the inlet water pipe is called connection point two. The valve two is located between connection point one and connection point two.

[0012] By adopting the above technical solution, when the temperature difference between the liquid in the inlet pipe and the standard temperature is large, the liquid in the inlet pipe can be quickly brought to the required temperature by mixing with the liquid in the chamber.

[0013] In a preferred embodiment, the present application may be further configured such that the temperature control device further includes a stirring blade, which is rotatably mounted on the water inlet pipe and located between connection one and connection two.

[0014] By adopting the above technical solution, when the liquid flows from reflux pipe one to reflux pipe two during use, the stirring blade will rotate, thereby improving the mixing effect of the liquid.

[0015] In a preferred embodiment, this application can be further configured such that: the temperature measuring module is also used to detect the liquid temperature inside each water inlet pipe in front of the temperature regulating device, the temperature measuring module also detects the liquid temperature in each chamber, the temperature control module reads the liquid temperature inside the water inlet pipe in front of the temperature regulating device and reads the liquid temperature in the corresponding chamber, and calculates the difference between the two. If it is not within the standard range, a notification signal is sent to the notification module.

[0016] By adopting the above technical solution, that is, by measuring the temperature at the corresponding position of the water inlet pipe and the temperature of the liquid in the chamber and calculating the difference, if the difference is not within the standard range, it indicates that the temperature after temperature adjustment does not meet the requirements, and then a notification is sent through the notification module.

[0017] In a preferred embodiment, this application can be further configured such that if the difference between the two values ​​is greater than the maximum value within the standard range, the temperature control module controls valve two to close, and valve one to open, so that the liquid in the inlet pipe enters the chamber through return pipe one, and then enters the inlet pipe again through return pipe two.

[0018] By adopting the above technical solution, when the difference between the two is greater than the maximum value within the standard range, it indicates that mixed cooling is required, thus resulting in better cooling effect.

[0019] In a preferred embodiment, the control system may be further configured such that: after the temperature control module closes valve two, it sends a timing signal to the timing module, the timing module responds to the timing signal to start timing, and after the timing ends, it obtains the temperature measured by the temperature measuring module for the corresponding cooling roller and sends it to the temperature control module. After receiving the temperature, the temperature control module compares it with the standard value. If they are different, it sends a maintenance signal to the notification module, and the notification module provides a prompt after receiving the maintenance signal.

[0020] By adopting the above technical solution, after mixing, the temperature of the temperature measuring module is detected after a period of time. If the temperature still does not meet the requirements, a maintenance notification is sent through the notification module. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the water inlet pipe and temperature control device of this application.

[0022] Figure 2 This is a schematic diagram of the control system principle of this application.

[0023] Attached reference numerals: 1. Inlet pipe; 2. Temperature control device; 21. Return pipe one; 22. Return pipe two; 23. Valve one; 24. Valve two; 25. Stirring blade; 26. Temperature control pipe; 27. Water supply pipe; 28. Water drain pipe; 31. Temperature measurement module; 32. Cooling module; 33. Temperature control module; 34. Notification module; 35. Timing module. Detailed Implementation

[0024] The present application will be further described in detail below with reference to the accompanying drawings.

[0025] Reference Figure 1 and Figure 2 This application discloses a PVC calendered film production process, which includes the following steps: feeding, extrusion, forming, cooling, edge trimming, and winding. In the cooling step, there are a primary cooling roller, a secondary cooling roller, and a tertiary cooling roller. The cooling temperatures of the primary cooling roller, the secondary cooling roller, and the tertiary cooling roller decrease sequentially. The water outlet pipe of the tertiary cooling roller is connected to the water inlet pipe 1 of the secondary cooling roller. The water outlet pipe of the secondary cooling roller is connected to the water inlet pipe 1 of the primary cooling roller. The water outlet pipe of the primary cooling roller is connected to the water inlet pipe 1 of the tertiary cooling roller. Temperature regulating devices 2 are provided on the water inlet pipes 1 of the primary cooling roller, the secondary cooling roller, and the tertiary cooling roller.

[0026] The temperature control device 2 includes a temperature control pipe 26, an inlet water pipe 27, a outlet water pipe 28, and a stirring blade 25. The temperature control pipe 26 is sleeved on the inlet water pipe 1 and forms a chamber with the outer wall of the inlet water pipe 1. The chamber is used to fill the heat-conducting liquid. The inlet water pipe 27 is connected to the chamber and is located at one end of the temperature control pipe 26, and the outlet water pipe 28 is connected to the chamber and is located at the other end of the temperature control pipe 26.

[0027] The inlet pipe 1 is also equipped with a return pipe 1 21 and a return pipe 22. One end of the return pipe 1 21 is connected to the inlet pipe 1, and the other end is connected to the chamber. One end of the return pipe 22 is connected to the inlet pipe 1, and the other end is connected to the chamber. The connection between the return pipe 1 21 and the inlet pipe 1 is called connection point one, and the connection between the return pipe 22 and the inlet pipe 1 is called connection point two. Both the return pipe 1 21 and the return pipe 22 are equipped with a valve 23. The inlet pipe 1 is also equipped with a valve 24, which is located between connection point one and connection point two. The stirring blade 25 is rotatably connected to the inlet pipe 1 and is located between connection point one and connection point two.

[0028] In the cooling step, a control system is employed, which includes a temperature measuring module 31, a temperature control module 33, a cooling module 32, a timing module 35, and a notification module 34. The temperature measuring module 31 detects the temperature of each stage of the cooling rollers and sends the temperature of the first-stage cooling roller to the cooling module 32. After receiving the temperature sent by the temperature measuring module 31, the cooling module 32 performs a difference calculation to obtain the temperatures corresponding to the second-stage and third-stage cooling rollers, and sends them to the temperature control module 33. The temperature control module 33 adjusts the temperature of the second-stage and third-stage cooling rollers according to the temperatures sent by the cooling module 32. After receiving the temperature sent by the temperature measuring module 31, the cooling module 32 makes a judgment. If the temperature does not fall within the standard temperature range, it sends a notification signal to the notification module 34. After receiving the notification signal, the notification module 34 provides a prompt.

[0029] The temperature measuring module 31 is also used to detect the liquid temperature inside each inlet pipe 1 before the temperature regulating device 2. The temperature measuring module 31 also detects the liquid temperature in each chamber. The temperature control module 33 reads the liquid temperature inside the inlet pipe 1 before the temperature regulating device 2 and reads the liquid temperature in the corresponding chamber, and calculates the difference between the two. If the difference is not within the standard range, a notification signal is sent to the notification module 34. If the difference is greater than the maximum value within the standard range, the temperature control module 33 controls valve 24 to close and valves 23 to open, so that the liquid in the inlet pipe 1 enters the chamber through return pipe 21 and then enters the inlet pipe 1 again through return pipe 22. After closing valve 24, temperature control module 33 sends a timing signal to timing module 35. Timing module 35 responds to the timing signal and starts timing. After timing ends, it obtains the temperature measured by temperature measurement module 31 for the corresponding cooling roller and sends it to temperature control module 33. After receiving the temperature, temperature control module 33 compares it with the standard value. If they are different, it sends a maintenance signal to notification module 34. Notification module 34 provides a prompt after receiving the maintenance signal.

[0030] During use, the temperature measuring module 31 detects the temperature of each cooling roller and sends the temperature of each cooling roller to the cooling module 32. After receiving the temperature of the first-stage cooling roller, the cooling module 32 performs a difference calculation. Let the temperature of the first-stage cooling roller be T1, then the temperature of the second-stage cooling roller T2 is T1-M, and the temperature of the third-stage cooling roller T3 is T1-N.

[0031] The cooling module 32 compares T2 and T1-M detected by the temperature measuring module 31. If the difference is not within the standard range, the cooling module 32 sends T1-M to the temperature control module 33. The cooling module 32 also compares T3 and T1-N detected by the temperature measuring module 31. If the difference is not within the standard range, the cooling module 32 sends T1-M to the temperature control module 33. The temperature module adjusts the temperature of the secondary cooling roller based on T1-M and the temperature of the tertiary cooling roller based on T1-N. The cooling module 32 also checks T1. If it does not fall within the standard temperature range, it sends a notification signal to the notification module 34. Upon receiving the notification signal, the notification module 34 provides a prompt.

[0032] Taking the secondary cooling roller as an example, the temperature measuring module 31 detects the liquid temperature T4 in the front section of the water inlet pipe 1 of the secondary cooling roller (i.e., in front of the temperature regulating device 2) and the liquid temperature T5 in the temperature regulating pipe 26 installed on the water inlet pipe 1, and calculates the difference between the two. If it is not within the standard range, a notification signal is sent to the notification module 34. When the difference is greater than the maximum value within the standard range, the temperature control module 33 controls the valve 24 of the water inlet pipe 1 to close, and the valves 23 on the return pipe 21 and the return pipe 22 are both open, so that the liquid in the water inlet pipe 1 enters the chamber through the return pipe 21 and enters the water inlet pipe 1 again through the return pipe 22. After closing valve 24, temperature control module 33 sends a timing signal to timing module 35. Timing module 35 responds to the timing signal and starts timing. After timing ends, it acquires the temperature measured by temperature measurement module 31 on the secondary cooling roller and sends it to temperature control module 33. After receiving the temperature, temperature control module 33 compares it with the standard value. If they are different, it sends a maintenance signal to notification module 34. Notification module 34 provides a prompt after receiving the maintenance signal.

[0033] The implementation principle of this embodiment is as follows: In use, by associating the temperature of the secondary and tertiary cooling rollers with the temperature of the primary cooling roller, the cooling effect is improved. At the same time, when adjusting the temperature of the liquid in each cooling roller, the temperature adjustment tube 26 is also used to improve the temperature adjustment effect.

[0034] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PVC calendered film production process, characterized in that: The process includes the following steps: feeding, extrusion, forming, cooling, trimming, and winding. The cooling step includes a primary cooling roller, a secondary cooling roller, and a tertiary cooling roller, with the cooling temperatures of the primary, secondary, and tertiary cooling rollers decreasing sequentially. A control system is used in the cooling step, comprising a temperature measuring module (31), a temperature control module (33), a cooling module (32), and a notification module (34). The temperature measuring module (31) detects the temperature of the primary cooling roller and sends the temperature to the cooling module (32). Upon receiving the temperature from the temperature measuring module (31), the cooling module (32) performs a difference calculation to determine the temperatures corresponding to the secondary and tertiary cooling rollers. The temperature is sent to the temperature control module (33). The temperature control module (33) adjusts the temperature of the secondary cooling roller and the tertiary cooling roller according to the temperature sent by the cooling module (32). After receiving the temperature sent by the temperature measurement module (31), the cooling module (32) makes a judgment. If it does not fall within the standard temperature range, it sends a notification signal to the notification module (34). After receiving the notification signal, the notification module (34) provides a prompt. The water outlet pipe of the tertiary cooling roller is connected to the water inlet pipe (1) of the secondary cooling roller, the water outlet pipe of the secondary cooling roller is connected to the water inlet pipe (1) of the primary cooling roller, and the water outlet pipe of the primary cooling roller is connected to the water inlet pipe (1) of the tertiary cooling roller. The primary cooling roller, the secondary cooling roller and the tertiary cooling roller are connected to each other. Temperature regulating devices (2) are provided on the water inlet pipe (1) of the cooling roller; the temperature regulating device (2) includes a temperature regulating pipe (26), which is sleeved on the water inlet pipe (1) and forms a cavity with the outer wall of the water inlet pipe (1), the cavity being filled with heat-conducting liquid; the temperature regulating device (2) also includes an upper water pipe (27) and a lower water pipe (28), both of which are connected to the temperature regulating pipe (26), one side of the upper water pipe (27) and the temperature regulating pipe (26) are connected, and the other side of the lower water pipe (28) and the temperature regulating pipe (26) are connected. The water inlet pipe (1) is also provided with a return pipe one (21) and a return pipe two (22), the return pipe Both the first (21) and the second (22) return pipe are connected to the temperature regulating pipe (26). Both the first (21) and the second (22) return pipe are equipped with valves (23). The inlet pipe (1) is also equipped with valves (24). The connection between the first (21) return pipe and the inlet pipe (1) is called connection point one, and the connection between the second (22) return pipe and the inlet pipe (1) is called connection point two. Valve (24) is located between connection point one and connection point two. The temperature regulating device (2) also includes a stirring blade (25). The stirring blade (25) is rotatably installed on the outer wall of the inlet pipe (1). The stirring blade (25) is located inside the temperature regulating pipe (26) and between connection point one and connection point two.

2. The PVC calendered film production process according to claim 1, characterized in that: The temperature measuring module (31) is also used to detect the liquid temperature inside each water inlet pipe (1) in front of the temperature regulating device (2). The temperature measuring module (31) also detects the liquid temperature in each chamber. The temperature control module (33) reads the liquid temperature inside the water inlet pipe (1) in front of the temperature regulating device (2) and reads the liquid temperature in the corresponding chamber, and calculates the difference between the two. If it is not within the standard range, a notification signal is sent to the notification module (34).

3. The PVC calendered film production process according to claim 2, characterized in that: If the difference between the two is greater than the maximum value within the standard range, the temperature control module (33) controls valve two (24) to close, and the two valves one (23) are connected, so that the liquid in the water inlet pipe (1) enters the chamber through the return pipe one (21) and enters the water inlet pipe (1) again through the return pipe two (22).

4. The PVC calendered film production process according to claim 3, characterized in that: The control system also includes a timing module (35). After the temperature control module (33) closes valve two (24), it sends a timing signal to the timing module (35). The timing module (35) responds to the timing signal to start timing. After the timing ends, it obtains the temperature measured by the temperature measurement module (31) for the corresponding cooling roller and sends it to the temperature control module (33). After receiving the temperature, the temperature control module (33) compares it with the standard value. If they are different, it sends a maintenance signal to the notification module (34). After receiving the maintenance signal, the notification module (34) provides a prompt.

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