Plasma coating system and coating method applied to container

Abstract

The invention relates to the technical field of food plastic packaging application, in particular to a plasma coating system and method applied to a container, and the plasma coating system comprises a supporting ionization assembly, a vacuum pipeline assembly, an inflation pipeline assembly and an oxygen supply coating pipeline assembly. The inflation pipeline assembly communicates with the connecting pipe and is suitable for inputting inert gas into the container. The plasma coating system has the beneficial effects that the plasma coating system applied to the container can be used in the coating operation of the inner container of the small-caliber container, the electrode assembly is arranged in the ionization pipe, and the ionization pipe is a medium pipeline, so that the plasma coating system can be used for coating the inner container of the small-caliber container, and the service life of the plasma coating system is prolonged. Therefore, the integration of the medium pipeline and the electrode assembly is realized, the space occupied by the electrode assembly and the pipeline is reduced, and the adaptability to a small-caliber container is improved.

Description

Technical Field

[0001] The invention relates to the technical field of food plastic packaging application, and in particular to a plasma coating system and coating method applied to containers. Background Art

[0002] Overall, half of all plastics produced by humans are used only once - used once and then thrown away. Plastic products have a long half-life in the natural environment, and the carbon emissions and toxic gases caused by existing major treatment technologies such as incineration cannot be ignored. Recycling is an effective way to reduce plastic pollution and save resources. How to properly use recycled plastics has become a global concern.

[0003] It is reported that recycling 0.45kg of plastic can reduce energy consumption by 84% and greenhouse gas emissions by 71%. However, in the recycling process, plastics usually need to undergo high-temperature chemical cleaning, and their polymer chains are easily broken under the action of thermal shear force, aging and affecting their performance. Therefore, improving the mechanical properties of plastics and improving their crystallinity is the key to improving the reuse of plastics.

[0004] By coating the plastic surface with aluminum film, its barrier properties can be increased by 3-10 times. It is relatively easy to coat flat packaging films. Roll film with high barrier coating can be directly prepared and then packaged in bags. However, for containers such as mineral water bottles, beverage bottles, and oil drums, it is difficult to coat them directly during the blow molding process due to the use of blow molding technology. Usually, the prepared containers need to be coated. Especially for such small-caliber containers, the requirements for nozzles are extremely high, and the coating is relatively complicated.

[0005] Therefore, the present invention aims at the problem that it is difficult to coat a high barrier coating inside a small-diameter plastic container in the prior art, and invents a plasma coating system for the container. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a plasma coating system and coating method for containers, which solves the technical problem of difficulty in coating high barrier coatings in small-caliber plastic containers in the prior art.

[0008] (II) Technical solution

[0009] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0010] In the first aspect, the present invention provides a plasma coating system for a container, comprising a support ionization assembly, a vacuum pipeline assembly, an air filling pipeline assembly and an oxygen supply coating pipeline assembly. The support ionization assembly comprises a support mechanism, a main pipeline and an electrode assembly. Both the container and the main pipeline can be supported on the support mechanism. The main pipeline comprises an ionization tube and a connecting pipe that are connected to each other. The ionization tube extends from the opening of the container into the container, and the opening of the container and the main pipeline are kept sealed; the electrode assembly is in the ionization tube, and the side wall of the ionization tube is evenly provided with discharge holes; the vacuum pipeline assembly is connected to the connecting pipe. The air filling pipeline assembly is connected to the connecting pipe, and is suitable for inputting an inert gas into the container. The oxygen supply coating pipeline assembly is connected to the connecting pipe, and is suitable for inputting a mixed medium of oxygen and coating materials into the ionization tube.

[0011] In a second aspect, the present invention provides a coating method, including the plasma coating system applied to a container in the above technical solution, the coating method comprising:

[0012] S1: supporting the container on a supporting mechanism;

[0013] S2: closing the gas filling pipeline assembly and the oxygen supply coating pipeline assembly, and opening the vacuum pipeline assembly to pump the internal pressure of the container to the first pressure;

[0014] S3: close the vacuum pipeline assembly and the oxygen supply coating pipeline assembly, and open the gas filling pipeline assembly to fill the container with inert gas;

[0015] S4: Close the vacuum pipeline assembly and the gas charging pipeline assembly, open the oxygen supply coating pipeline assembly, input a mixed medium of oxygen and coating materials into the ionization tube, and energize the electrode assembly.

[0016] (III) Beneficial effects

[0017] The beneficial effects of the present invention are as follows: the plasma coating system applied to containers of the present invention can be used in the coating operation of the inner liner of a small-diameter container. Since the electrode assembly is arranged in the ionization tube, and the ionization tube is the medium pipeline, the medium pipeline and the electrode assembly are integrated, the space occupied by the electrode assembly and the pipeline is reduced, and the adaptability to small-diameter containers is improved.

[0018] In the coating system of the present invention, the support, ionization, vacuum treatment, gas filling and oxygen supply coating functions are highly integrated, which ensures the compactness of the structure of the entire system and ensures the coating effect of the coating inside the container in multiple dimensions.

[0019] The support mechanism can firmly support the container and the main pipe to ensure stability during the coating process.

[0020] The main line includes an ionization tube and a connecting tube. The ionization tube matches the opening size of the container and extends directly into the container. This design ensures the compatibility of the ionization tube and the container, reduces the loss of gas and coating materials during the transmission process, and enables the medium to be coated more directly on the inner wall of the container, thereby improving the coating effect and efficiency.

[0021] The discharge holes on the side wall of the ionization tube can ensure that the coating material is fully excited by the plasma in the ionization tube and then sprayed onto the surface of the container liner in a uniform manner. This helps to form a uniform and dense coating, improve the overall quality of the coating, and further improve the coating effect and efficiency.

[0022] By evenly distributing the discharge holes, the coating material can cover every corner and surface of the container liner, reducing the coating blind area, increasing the coating coverage, and thus improving the coating effect and efficiency.

[0023] The design of evenly distributed discharge holes on the side wall of the ionization tube enables the system to adapt to container liners of different shapes and sizes, improving the flexibility and versatility of the system, thereby improving the coating effect and efficiency.

[0024] This design helps improve coating efficiency and shorten production cycles because the coating material can be sprayed evenly and quickly onto the surface of the container liner. Uniform coating and precise coating thickness control help form high-quality, high-performance coatings to meet a variety of application requirements.

[0025] The vacuum pipeline assembly is connected to the connecting pipe to ensure that the air in the container can be effectively evacuated before coating, creating a high vacuum environment for plasma coating, improving the coating quality of subsequent coating, and thus improving the coating effect and efficiency.

[0026] The filling pipeline assembly is also connected to the connecting pipe and is used to fill the container with inert gas. It can adjust the air pressure environment in the container and provide inert gas protection for the coating process, which is beneficial to the formation of plasma and the stability of the coating process, thereby improving the coating effect and efficiency.

[0027] The oxygen supply coating pipeline assembly can simultaneously input a mixed medium of oxygen and coating materials into the ionization tube. The mixed medium is excited by high-energy plasma in the ionization tube to form high-temperature and high-speed coating particles, which are sprayed onto the surface of the container liner to form a coating, which is beneficial to improve the uniformity of the coating, thereby improving the coating effect and coating efficiency.

[0028] The design of the entire system fully considers the characteristics of small-caliber containers. Through the integration of electrode components and medium pipelines, compact support mechanisms and efficient pipeline connections, precise coating and plating in a small space is achieved. This not only improves coating and plating efficiency, but also reduces restrictions on container shape and size, broadening the application range of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a plasma coating system applied to a container according to the present invention.

[0030] [Description of Reference Numerals]

[0031] 10. Container; 100. Support ionization assembly; 200. Vacuum pipeline assembly; 300. Inflating pipeline assembly; 400. Oxygen supply coating pipeline assembly; 500. Microwave generator; 600. Pressure gauge; 700. Pressure relief pipeline assembly; 110. Support mechanism; 111. Base; 112. Positioning boss; 113. Fastening ferrule; 120. Main pipeline; 121. Ionization tube; 122. Connecting pipe; 130. Electrode assembly; 210. Vacuum pump; 220. Negative pressure pipeline ; 230, negative pressure valve; 310, inert gas cylinder; 320, inflation pump; 330, inflation valve; 340, inflation pipeline; 350, inflation gas flow meter; 410, oxygen cylinder; 420, oxygen pump; 430, pulse generator; 440, former; 450, raw material tank; 460, oxygen supply gas flow meter; 470, oxygen supply control valve; 480, mixed medium flow meter; 490, discharge control valve; 710, pressure relief pipeline; 720, pressure relief valve. DETAILED DESCRIPTION

[0032] In order to better explain the present invention, so as to facilitate understanding, the following Figure 1 , the present invention is described in detail through specific implementation methods.

[0033] Embodiment 1:

[0034] Reference Figure 1 The embodiment of the present invention provides a plasma coating system applied to a container 10, including a support ionization assembly 100, a vacuum pipeline assembly 200, a gas filling pipeline assembly 300 and an oxygen supply coating pipeline assembly 400. The support ionization assembly 100 includes a support mechanism 110, a main pipeline 120 and an electrode assembly 130. Both the container 10 and the main pipeline 120 can be supported on the support mechanism 110. The main pipeline 120 includes an ionization tube 121 and a connecting pipe 122 connected to each other. The ionization tube 121 extends from the opening of the container 10 to the inside of the container 10, and the opening of the container 10 and the main pipeline 120 are kept sealed; the electrode assembly 130 is in the ionization tube 121, and the side wall of the ionization tube 121 is uniformly provided with discharge holes; the vacuum pipeline assembly 200 is connected to the connecting pipe 122. The gas filling pipeline assembly 300 is connected to the ionization tube 121 through the connecting pipe 122, and is suitable for inputting inert gas into the container 10. The oxygen supply coating pipeline assembly 400 is communicated with the connecting pipe 122 and is suitable for inputting a mixed medium of oxygen and coating materials into the ionization tube 121 .

[0035] In this embodiment, the system can be used in the coating operation of the inner liner of a small-diameter container 10. Since the electrode assembly 130 is arranged in the ionization tube 121, and the ionization tube 121 is a medium pipeline, the medium pipeline and the electrode assembly 130 are integrated, the space occupied by the electrode assembly 130 and the pipeline is reduced, and the adaptability to the small-diameter container 10 is improved;

[0036] Specifically, the ionization tube 121 can be made of ceramic material to avoid safety accidents such as short circuit of the electrode assembly 130. There are small holes around the ionization tube 121 to facilitate the coating mixed gas and inert gas to enter the annular cavity to directly generate a plasma cloud under the action of inductance. The generated plasma cloud is evenly coated around the tube wall through the annular channel, and the coating is more uniform.

[0037] In the coating system of this embodiment, the support, ionization, vacuum treatment, gas filling and oxygen supply coating functions are highly integrated, ensuring the compactness of the structure of the entire system.

[0038] The supporting mechanism 110 can stably support the container 10 and the main pipe 120 to ensure stability during the coating process.

[0039] The main line 120 includes an ionization tube 121 and a connecting tube 122. The ionization tube 121 matches the opening size of the container 10 and directly extends into the interior of the container 10. This design ensures the compatibility of the ionization tube 121 and the container 10, reduces the loss of gas and coating materials during the transmission process, and enables the medium to be more directly coated on the inner wall of the container 10, thereby improving efficiency.

[0040] The discharge holes on the side wall of the ionization tube 121 can ensure that the coating material is fully excited by the plasma in the ionization tube 121 and then sprayed onto the surface of the inner liner of the container 10 in a uniform manner. This helps to form a uniform and dense coating and improve the overall quality of the coating.

[0041] By evenly distributing the discharge holes, the coating material can cover every corner and surface of the inner liner of the container 10, reducing the coating blind area and improving the coverage of the coating.

[0042] The distribution and size of the discharge holes can be adjusted as needed to control the flow and speed of the coating material, thereby achieving precise control of the coating thickness.

[0043] The design of evenly distributed discharge holes on the side wall of the ionization tube 121 enables the system to adapt to the inner liners of the containers 10 of different shapes and sizes, thereby improving the flexibility and versatility of the system.

[0044] Since the coating material can be sprayed evenly and quickly onto the inner surface of the container 10, this design helps to improve the coating efficiency and shorten the production cycle.

[0045] Uniform deposition and precise coating thickness control help produce high-quality, high-performance coatings for a wide range of application needs.

[0046] The vacuum pipeline assembly 200 is connected to the connecting pipe 122 to ensure that the air in the container 10 can be effectively evacuated before coating, thereby creating a high vacuum environment for plasma coating and improving the coating quality of subsequent coating.

[0047] The filling pipeline assembly 300 is also connected to the connecting pipe 122, and is used to fill the container 10 with inert gas, which can adjust the air pressure environment in the container 10, provide inert gas protection for the coating process, and is conducive to the formation of plasma and the stability of the coating process.

[0048] The oxygen supply coating pipeline assembly 400 can simultaneously input a mixed medium of oxygen and coating materials into the ionization tube 121. The mixed medium is excited by high-energy plasma in the ionization tube 121 to form high-temperature and high-speed coating particles, which are sprayed onto the inner surface of the container 10 to form a coating, which is beneficial to improving the uniformity of the coating and further improving the coating effect.

[0049] The design of the entire system fully considers the characteristics of the small-caliber container 10, and realizes precise coating and plating in a small space through the integration of the electrode assembly 130 and the medium pipeline, the compact support mechanism 110 and the efficient pipeline connection. This not only improves the coating and plating efficiency, but also reduces the restrictions on the shape and size of the container 10, and broadens the application range of the system.

[0050] When the system is working, the electrode assembly 130 does not work during the vacuuming process and the inert gas filling process. During the coating process, the electrode assembly 130 works to output the mixed medium of oxygen and material to the inner wall of the container 10 after ionization.

[0051] The system also includes a controller, which is respectively controlled and connected to the electrode assembly 130, the vacuum pipeline assembly 200, the inflation pipeline assembly 300 and the oxygen supply and coating pipeline assembly 400. The controller first controls the vacuum pipeline assembly 200 to extract the air in the container 10, and then controls the inflation pipeline assembly 300 to input inert gas into the container 10, and then controls the oxygen supply and coating pipeline assembly 400 to operate. At the same time, the electrode assembly 130 is controlled to be energized so that the medium output from the discharge hole on the ionization tube 121 is ionized and coated on the inner wall of the container 10.

[0052] In this embodiment, the vacuum pipeline assembly 200, the inflation pipeline assembly 300 and the oxygen supply coating pipeline assembly 400 work together to improve the coating effect of the inner wall coating of the container 10 in multiple dimensions. They are inseparable rather than a combined relationship. The purpose of vacuuming before inputting the inert gas is to reduce the pressure in the container 10 and to expel the original air in the container 10. By inputting the inert gas, the pressure in the container 10 can be adjusted to a balanced state again, and at the same time, inert gas protection is provided for the ionization process. When the above two steps are completed, sufficient coating preparation is made at this time, and the oxygen supply coating pipeline assembly 400 works to perform the coating operation, which greatly ensures the coating effect of the coating in the container 10.

[0053] Embodiment 2:

[0054] Reference Figure 1 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0055] The plasma coating system further includes a microwave generator 500 , which is suitable for abutting against the outer wall of the container 10 ; a plurality of microwave generators 500 are arranged, and are evenly distributed around the periphery of the container 10 along the circumference of the container 10 .

[0056] In this embodiment, the microwave generator 500 is disposed outside the container 10 and can be used or not according to the situation. The power can be adjusted at any time to achieve flexible adjustment for different solid media and container 10 diameters.

[0057] The microwave generator 500 can generate microwave energy, and when it abuts against the outer wall of the container 10, the microwave energy can penetrate the wall of the container 10, or directly form a microwave field outside the container 10 to assist heating the inside of the container 10. This heating method helps to increase the temperature inside the container 10, promote rapid melting and uniform distribution of the coating material, and thus improve the adhesion and quality of the coating.

[0058] The microwave energy can also promote the formation and stabilization of plasma in the ionization tube 121. By adjusting the microwave power, the density and temperature of the plasma can be controlled, further optimizing the coating effect and improving the coating efficiency.

[0059] There are multiple microwave generators 500, which are evenly distributed around the container 10 along the circumference of the container 10. This layout allows the system to be flexibly adjusted according to the size, shape and coating requirements of the container 10. By controlling the power and switch status of different probes, uniform distribution and precise control of the temperature inside the container 10 can be achieved.

[0060] In short, microwave-assisted heating can accelerate the melting and distribution process of coating materials, thereby shortening the coating time and improving production efficiency.

[0061] By precisely controlling the temperature inside the container 10 and the state of the plasma, a more uniform and dense coating can be formed, thereby improving the adhesion and wear resistance of the coating.

[0062] The flexible layout and adjustable power of the microwave generator 500 enable the system to adapt to containers 10 of different diameters, materials and shapes, thereby improving the versatility and practicality of the system.

[0063] Embodiment 3:

[0064] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0065] The electrode assembly 130 includes a cathode electrode and an anode electrode, one of which is spirally distributed along the axis of the ionization tube 121, and the other of which extends along the axis of the ionization tube 121 to form an ionization zone between the cathode electrode and the anode electrode.

[0066] In this embodiment, one of the cathode electrode and the anode electrode, such as the cathode electrode, is distributed in a spiral shape along the axial direction of the ionization tube 121. This arrangement can increase the surface area of ​​the electrode assembly 130, thereby providing more electron emission points. When current passes through the spiral electrode assembly 130, electrons are more easily accelerated and collided on the spiral path, thereby improving the ionization efficiency.

[0067] Another electrode assembly 130, if assumed to be an anode electrode, extends straight along the axis direction of the ionization tube 121. This arrangement allows a relatively stable electric field region, i.e., an ionization region, to be formed between the anode electrode and the spiral electrode assembly 130. In this region, electrons are accelerated and collide with gas molecules, causing the gas molecules to be ionized and form plasma.

[0068] The arrangement of the spiral electrode assembly 130 improves the electron emission efficiency and collision frequency, thereby promoting the ionization process of gas molecules.

[0069] A stable electric field region is formed between the anode electrode extending in the axial direction and the spiral cathode electrode, and can better match the shape of the ionization tube 121, which is beneficial to the maintenance and stability of the plasma.

[0070] Embodiment 4:

[0071] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0072] The plasma coating system further includes a pressure gauge 600 connected to the connecting pipe 122 and suitable for measuring the pressure of the connecting pipe 122 .

[0073] In this embodiment, the pressure gauge 600 is connected to the connecting pipe 122, and its main function is to measure the pressure inside the connecting pipe 122. The pressure inside the connecting pipe 122 directly reflects the pressure inside the container 10. By real-time monitoring of the pressure of the connecting pipe 122, the operator can timely adjust system parameters, such as gas flow, coating speed, etc., to ensure the stability of the coating process and the uniformity of the coating quality.

[0074] Embodiment 5:

[0075] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0076] The vacuum pipeline assembly 200 includes a vacuum pump 210, a negative pressure pipeline 220 and a negative pressure valve 230. The negative pressure valve 230 is arranged on the negative pressure pipeline 220 to control the opening and closing of the negative pressure pipeline 220. The two ends of the negative pressure pipeline 220 are respectively connected to the connecting pipe 122 and the vacuum pump 210.

[0077] In this embodiment, in the plasma coating system, the vacuum pipe assembly 200 is responsible for creating and maintaining the required vacuum environment during the coating process.

[0078] The vacuum pump 210 reduces the internal pressure of the container 10 to a desired vacuum level by extracting gas from the container 10 .

[0079] The negative pressure pipeline 220 is a passage connecting the vacuum pump 210 and the connecting pipe 122. It is responsible for discharging the gas extracted by the vacuum pump 210 out of the system while maintaining the vacuum state inside the system.

[0080] The negative pressure valve 230 is arranged on the negative pressure pipeline 220. By adjusting the opening of the negative pressure valve 230, the vacuum degree and gas flow rate inside the system can be controlled. The negative pressure valve 230 can be a manual valve or an automatic valve. In the plasma coating system, in order to realize automatic control, an automatic valve can be used and remotely operated through the control system.

[0081] The negative pressure valve 230 is communicatively connected with the pressure gauge 600 to form a negative pressure feedback control loop of the negative pressure valve 230 to monitor and adjust the negative pressure state inside the container 10 in real time to ensure that the coating process is carried out within a predetermined vacuum range, thereby improving the accuracy of coating and the quality of the coating.

[0082] The pressure gauge 600 is installed on the connecting pipe 122 and is used to monitor the pressure inside the container 10 in real time. It can accurately convert the pressure value inside the container 10 into a readable signal.

[0083] The pressure gauge 600 transmits the monitored pressure signal to the control system. This signal can be an analog signal or a digital signal. After receiving the signal from the pressure gauge 600, the control system will compare it with the preset negative pressure target value. If there is a deviation between the actual pressure and the target value, the control system will calculate the amplitude and direction of the adjustment required.

[0084] The control system adjusts the opening of the negative pressure valve 230 through a control signal. If the pressure in the container 10 is too high, the control system will send a signal to increase the opening of the negative pressure valve 230 and increase the amount of air pumped to reduce the pressure; conversely, if the pressure is too low, the opening of the negative pressure valve 230 will be reduced or the valve will be closed to prevent excessive air pumping.

[0085] This process is a closed-loop feedback control loop. The pressure gauge 600 continuously monitors the pressure in the container 10 and feeds the information back to the control system. The control system continuously adjusts the opening of the negative pressure valve 230 according to the feedback information until the pressure in the container 10 is stabilized within the preset target value range.

[0086] Through real-time monitoring and adjustment, it is possible to ensure that the negative pressure state in the container 10 is always maintained within a predetermined range, thereby improving the accuracy of coating and the quality of the coating.

[0087] The closed-loop feedback control loop can automatically compensate for disturbances and changes within the system and maintain the stability of the negative pressure state.

[0088] The entire control process is completed automatically by the control system without manual intervention, which improves production efficiency and automation level.

[0089] Embodiment 6:

[0090] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0091] The inflation pipeline assembly 300 includes an inert gas cylinder 310, an inflation pump 320, an inflation valve 330 and an inflation pipeline 340. The inert gas cylinder 310 is connected to the inflation pump 320. The inflation valve 330 is arranged on the inflation pipeline 340. The two ends of the inflation pipeline 340 are respectively connected to the inflation pump 320 and the connecting pipe 122.

[0092] In this embodiment, in the plasma coating system, the gas filling pipeline assembly 300 is responsible for filling the coating chamber with inert gas to create an inert gas atmosphere to ensure stable formation of plasma.

[0093] The inert gas cylinder 310 is a container 10 for storing inert gas, and common inert gases include argon, nitrogen, etc. These gases are used to fill the coating chamber during the coating process to exclude oxygen and other active gases that may interfere with the coating process. The inert gas cylinder 310 has high pressure and sealing properties to ensure that the gas does not leak during storage and transportation.

[0094] The air pump 320 is used to extract the inert gas from the gas cylinder and transport it to the coating chamber through the air charging pipeline 340. The air pump 320 needs to have sufficient pressure and flow to meet the gas demand during the coating process. The air pump 320 can be a manual pump or an electric pump, and the appropriate type is selected according to the system scale and degree of automation. The air charging valve 330 is set on the air charging pipeline 340 to control the opening and closing of the air charging pipeline 340 and the gas flow. By adjusting the opening of the air charging valve 330, the gas pressure and composition in the coating chamber can be accurately controlled. The air charging valve 330 can be a manual valve or an automatic valve, and the appropriate type is selected according to the system requirements. The automatic valve can be remotely operated through the control system to achieve automatic control.

[0095] The gas charging line 340 is a passage connecting the inert gas cylinder 310, the gas charging pump 320 and the connecting pipe 122. It is responsible for delivering the inert gas from the gas cylinder to the container 10 and ensuring the stability and safety of the gas during the delivery process.

[0096] An inflation gas flow meter 350 for detecting the gas flow of the inflation pump 320 is provided between the inflation pump 320 and the main pipeline 120 . The inflation valve 330 is communicatively connected with the pressure gauge 600 and the inflation gas flow meter 350 to form an inflation feedback control loop of the inflation valve 330 .

[0097] The inflation feedback control loop can ensure that during the inflation process, the gas can be accurately delivered to the target container 10 according to the predetermined flow rate and pressure.

[0098] The air pump 320 is the power source of the system and is responsible for generating and outputting gas. It can start or stop working according to the instructions of the control system.

[0099] The inflation gas flow meter 350 is installed between the inflation pump 320 and the main pipe 120, and is used to monitor the gas flow rate flowing to the target container 10 through the main pipe 120 in real time. The flow meter converts the monitored flow data into a readable signal.

[0100] The inflation gas flow meter 350 transmits the flow signal and the pressure gauge 600 signal to the control system. These signals can be analog signals or digital signals. After receiving the signals from the flow meter and the pressure gauge 600, the control system will perform a comprehensive analysis. It will compare the actual flow with the preset flow target value, while taking into account the pressure in the container 10.

[0101] According to the control system's instructions, the inflation valve 330 will adjust its opening accordingly. If the actual flow rate is lower than the target value, the control system will send a signal to increase the opening of the inflation valve 330 to increase the gas flow rate; conversely, if the flow rate is too high, the valve opening will be reduced or the valve will be closed to prevent over-inflation.

[0102] The pressure gauge 600 also participates in the control of this loop. It monitors the pressure in the container 10 in real time and transmits the pressure signal to the control system. The control system will adjust the opening of the inflation valve 330 by considering both flow rate and pressure to ensure that the pressure in the container 10 is kept within a safe range while the predetermined flow rate is reached.

[0103] The whole process is a closed-loop feedback control loop. The inflation gas flow meter 350 and the pressure gauge 600 continuously monitor the flow and pressure and feed the information back to the control system. The control system continuously adjusts the opening of the inflation valve 330 according to the feedback information until the predetermined flow and pressure targets are reached.

[0104] Through real-time monitoring and adjustment, accurate control of gas flow and pressure during inflation can be ensured.

[0105] By controlling the opening of the inflation valve 330, safety problems such as rupture of the container 10 due to excessive inflation can be prevented.

[0106] The entire control process is automatically completed by the control system, which improves production efficiency and automation level.

[0107] Embodiment 7:

[0108] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0109] The oxygen supply coating pipeline assembly 400 includes an oxygen cylinder 410, an oxygen pump 420, a pulse generator 430, a former 440, a raw material tank 450, and a valve of a connecting pipe 122; the oxygen cylinder 410 is connected to the inlet end of the oxygen pump 420; the outlet end of the former 440 is connected to the connecting pipe 122; the outlet end of the raw material tank 450 is connected to the material inlet end of the former 440; a first output end and a second output end extend from the oxygen pump 420, the first output end is connected to the inlet end of the pulse generator 430, and the outlet end of the pulse generator 430 is connected to the gas inlet end of the former 440; the second output end is connected to the downstream area of ​​the raw material tank 450 along which the raw material is output, so as to form a fluidized zone for forming the material in the downstream area of ​​the raw material tank 450; the valve of the connecting pipe 122 can be arranged on the connecting pipe 122.

[0110] In this embodiment, the oxygen cylinder 410 is used as an oxygen storage device to provide a stable oxygen source for the entire system. The oxygen cylinder 410 usually has a high pressure, which can ensure that the oxygen maintains sufficient power during the transportation process.

[0111] The oxygen pump 420 is responsible for pressurizing the oxygen in the oxygen cylinder 410 and delivering it to various required parts of the system. The oxygen pump 420 has two output ends, which serve different functional requirements respectively, reflecting the flexibility and efficiency of the design.

[0112] The first output end of the oxygen pump 420 is connected to the pulse generator 430, which generates periodic pressure fluctuations and transmits these pulses to the gas inlet end of the former 440. This pulse control can effectively adjust the gas flow rate and speed during the coating process, thereby improving the uniformity and accuracy of the coating.

[0113] The pulses generated by the pulse generator 430 enter the former 440, driving the plunger inside the former to reciprocate. The former 440 is responsible for mixing the coating raw materials with oxygen and ejecting the mixed materials at a certain speed through its outlet.

[0114] The raw material tank 450 stores raw materials required for coating, such as solid raw materials, and its outlet end is connected to the material inlet end of the former 440. The design of the raw material tank 450 should ensure that the raw materials can flow smoothly into the former 440 to avoid blockage and waste.

[0115] The second output end of the oxygen pump 420 is connected to the downstream area of ​​the raw material tank 450 to form a fluidized area for the material. In this area, oxygen is mixed with the coating raw material, so that the raw material is in a fluidized state before being ejected, thereby improving the coating effect and efficiency.

[0116] The valve of the connecting pipe 122 is used to control the flow of materials during the coating process. By adjusting the opening of the valve, the rate and amount of coating can be accurately controlled to meet different process requirements.

[0117] The design of the entire oxygen supply coating pipeline assembly 400 fully considers various requirements in the coating process, and through the coordination of the above-mentioned components, precise control and high efficiency of coating are achieved.

[0118] The oxygen supply coating pipeline assembly 400 also includes an oxygen supply gas flowmeter 460 and an oxygen supply regulating valve 470. The oxygen supply regulating valve 470 and the oxygen supply gas flowmeter 460 are both arranged between the first output end and the pulse generator 430, and the oxygen supply gas flowmeter 460 is communicatively connected with the oxygen supply regulating valve 470 to form an oxygen supply feedback control loop of the oxygen supply regulating valve 470; the oxygen pump 420 is communicatively connected with the valve of the connecting pipe 122 to form a mixed medium feedback control loop of the valve of the connecting pipe 122.

[0119] The oxygen supply coating pipeline assembly 400 also includes a mixed medium flow meter 480 arranged on the connecting pipe 122, and a discharge regulating valve 490 arranged on the outlet end of the raw material tank 450. The mixed medium flow meter 480 and the discharge regulating valve 490 are communicatively connected to form a discharge feedback control loop of the discharge regulating valve 490, thereby adjusting the gas-solid ratio of the mixed medium in the former 440.

[0120] The feedback control principles and effects of the above-mentioned oxygen supply feedback control loop, mixed medium feedback control loop and discharge feedback control loop are the same as above and will not be elaborated here.

[0121] Embodiment 8:

[0122] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0123] The plasma coating system further includes a pressure relief pipeline assembly 700 . The pressure relief pipeline assembly 700 includes a pressure relief pipeline 710 communicating with the connecting pipe 122 , and a pressure relief valve 720 disposed on the pressure relief pipeline 710 .

[0124] In this embodiment, when the internal pressure of the container 10 rises abnormally, or when pressure relief is required during coating, the pressure relief valve 720 will open automatically or manually to release the excess pressure into the atmosphere or a designated safe area through the pressure relief line 710, thereby protecting the equipment and pipelines in the system from damage.

[0125] As a safety protection device of the system, the pressure relief valve 720 can respond quickly in an emergency, reduce the internal pressure of the system, and prevent safety accidents such as explosion and leakage caused by excessive pressure.

[0126] By releasing the excess pressure in time, the pressure relief valve 720 helps to maintain the stability of the internal pressure of the system and ensure the smooth progress of the plasma coating process.

[0127] Embodiment 9:

[0128] Reference Figure 1 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0129] The supporting mechanism 110 includes a base 111, a positioning boss 112 connected to the base 111, and a fastening sleeve 113. The open end of the container 10 can be supported on the base 111 and positioned by the positioning boss 112. The fastening sleeve 113 can lock the open end of the container 10 with the base 111; the positioning boss 112 can extend from the open end of the container 10 into the container 10, and the fastening sleeve 113 can fasten the outer wall of the open end of the container 10.

[0130] In the plasma coating system, the base 111 serves as the foundation of the entire support mechanism 110, bears the weight of the container 10, and provides a stable support platform. It is usually made of strong, corrosion-resistant metal materials, such as stainless steel or alloy steel, to cope with high temperature and corrosive environments.

[0131] The positioning boss 112 extends from the base 111 and is designed as a raised portion that matches the shape of the open end of the container 10. The positioning boss 112 can accurately position the open end of the container 10 to ensure that the container 10 does not move or tilt during the coating process, thereby ensuring the accuracy and uniformity of the coating.

[0132] The fastening sleeve 113 is designed as an annular sleeve that can be fastened around the outer wall of the open end of the container 10, and includes adjustable fasteners such as bolts, buckles, etc.

[0133] By tightening the sleeve 113, the open end of the container 10 is firmly locked on the base 111, which further increases the stability of the container 10, prevents the container 10 from falling off or shifting due to vibration or impact during the coating process, and can also achieve a sealed connection between the container 10 and the base 111.

[0134] The main pipe 120 is supported on the base 111 and maintains a sealed connection with the base 111. In this way, the main pipe 120 can maintain a sealed connection with the opening of the container 10 to ensure the reliability of the plasma coating system during use.

[0135] The container 10 is placed on the base 111 , and its open end is matched with the positioning boss 112 and preliminarily positioned.

[0136] Subsequently, a fastening sleeve 113 is used to fasten around the outer wall of the open end of the container 10 , and the fastener is adjusted so that the sleeve fits tightly against the wall of the container 10 , thereby achieving a firm fixation of the container 10 .

[0137] During the entire coating process, the support mechanism 110 ensures the stability of the container 10 and the accuracy of coating through the stable support of the base 111, the precise positioning of the positioning boss 112 and the firm locking of the fastening sleeve 113.

[0138] The opening of the container 10 is sealed and connected to the base 111 , and the main pipeline 120 passes through the base 111 and is sealed and connected to the base 111 , so that the opening of the container 10 and the main pipeline 120 are kept sealed.

[0139] The container 10 can be supported on the supporting mechanism 10 in an inverted manner to utilize its own gravity to improve the sealing effect between the container 10 and the base 111 .

[0140] Embodiment 10:

[0141] An embodiment of the present invention provides a coating method, which is applied to the plasma coating system applied to the container 10 in any of the above embodiments. The coating method includes:

[0142] S1: supporting the container 10 on the supporting mechanism 110;

[0143] S2: closing the gas filling pipeline assembly 300 and the oxygen supply coating pipeline assembly 400, and opening the vacuum pipeline assembly 200 to pump the internal pressure of the container 10 to the first pressure;

[0144] S3: closing the vacuum pipeline assembly 200 and the oxygen supply coating pipeline assembly 400, and opening the gas filling pipeline assembly 300 to fill the container 10 with inert gas;

[0145] S4: Power on the electrode assembly 130 , close the vacuum pipeline assembly 200 and the gas charging pipeline assembly 300 , and open the oxygen supply coating pipeline assembly 400 to input a mixed medium of oxygen and coating materials into the ionization tube 121 .

[0146] The following is a detailed analysis of the coating method:

[0147] S1: Support the container 10 on the supporting mechanism 110 .

[0148] Purpose: To ensure that the container 10 remains stable during the coating process so as to perform accurate coating operations.

[0149] Operation: Place the open end of the container 10 on the base 111 of the support mechanism 110 , use the positioning boss 112 for preliminary positioning, and firmly lock the outer wall of the open end of the container 10 on the base 111 by tightening the sleeve 113 .

[0150] S2: Close the inflation pipeline assembly 300 and the oxygen supply coating pipeline assembly 400, and open the vacuum pipeline assembly 200.

[0151] Purpose: To evacuate the interior of the container 10 to remove air, moisture and other impurities in the container 10 and create a clean environment for subsequent coating operations.

[0152] Operation: First, close the inflation pipeline assembly 300 and the oxygen supply coating pipeline assembly 400 to prevent gas or materials from entering the container 10 during the vacuuming process. Then open the vacuum pipeline assembly 200, start the vacuum pump 210, and extract the gas inside the container 10 through the evacuation pipeline until the internal pressure of the container 10 reaches the preset first pressure.

[0153] S3: Close the vacuum pipeline assembly 200 and the oxygen supply coating pipeline assembly 400, and open the inflation pipeline assembly 300.

[0154] Purpose: To fill the container 10 with an inert gas such as argon, nitrogen, etc. to form a protective atmosphere to ensure the coating quality.

[0155] Operation: After confirming that the required vacuum degree has been reached inside the container 10, close the vacuum pipeline assembly 200 and the oxygen supply coating pipeline assembly 400. Then open the gas filling pipeline assembly 300 and fill the container 10 with a proper amount of inert gas through the gas filling pipeline 340 until the pressure inside the container 10 returns to a level suitable for coating.

[0156] S4: close the vacuum pipeline assembly 200 and the gas charging pipeline assembly 300, open the oxygen supply coating pipeline assembly 400, and energize the electrode assembly 130.

[0157] Purpose: By utilizing the high temperature and high speed characteristics of plasma, the coating material is sprayed onto the inner wall of the container 10 in a molten or semi-molten state to form a coating.

[0158] Operation: After confirming that the inside of the container 10 is filled with inert gas and reaches a stable state, close the vacuum pipeline assembly 200 and the gas filling pipeline assembly 300 to prevent external gas from interfering with the coating process. Then open the oxygen supply coating pipeline assembly 400, input the mixed medium of oxygen and coating material into the ionization tube 121, and energize the electrode assembly 130 to generate a high-frequency electromagnetic field. Under the action of plasma, the mixed medium is heated and accelerated to be sprayed onto the inner wall of the container 10 to form the desired coating.

[0159] Specifically, this embodiment takes the coating operation of SiO2 on the PET container 10, that is, coating silicon dioxide on the inner wall of the polyethylene terephthalate container 10 as an example. Under the action of ionization, Si reacts with O2 to generate SiO2.

[0160] First, the main pipe 120 is fixed on the base 111 and tightened; secondly, the plastic container 10 is moved to the base 111 by the mechanical claw, so that the ionization tube 121 is located in the middle of the container 10, and the container 10 is positioned by the boss and tightened by the tightening sleeve 113;

[0161] Keep the valve of the connecting pipe 122, the inflation valve 330 and the pressure relief valve 720 closed, open the negative pressure valve 230, and start the vacuum pump 210, and stop the vacuum pump 210 after the pressure gauge 600 reaches 10KPa;

[0162] Close the negative pressure valve 230, the connecting pipe 122 valve and the pressure relief valve 720, open the charging valve 330, the inert gas cylinder 310 is a nitrogen cylinder, start the charging pump 320, and charge N2 at a flow rate of 20 ml / min. When the pressure gauge 600 displays 80 KPa, stop the charging pump 320 and turn off the charging;

[0163] Open the valve of the connecting pipe 122, start the oxygen pump 420, close the inflation valve 330, the negative pressure valve 230 and the pressure relief valve 720. Si enters the connecting pipe 122 at a speed of 50g / min. Turn on the electrode assembly 130, set the power to 13MHz, turn on the microwave generator 500, and the power is 100W. Keep the material conveyed continuously, and after 10 minutes, turn off the oxygen pump 420, close the valve of the connecting pipe 122, and disconnect the power of the electrode assembly 130 and the power of the microwave generator 500. Then open the valve pressure relief valve to empty the gas in the container 10 to normal pressure, loosen the container 10 to tighten the ferrule 113, and place the coated gas cylinder in the product area through the mechanical claw.

[0164] It can be understood that, except for any conflicting parts, the above-mentioned embodiments 1-10 can be freely combined to form other implementation modes of the present invention.

[0165] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0166] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0167] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0168] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0169] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A plasma coating system for a container, characterized in that: include: A supporting ionization assembly (100), a vacuum pipeline assembly (200), an air charging pipeline assembly (300) and an oxygen supply coating pipeline assembly (400); The supported ionization assembly (100) comprises a supporting mechanism (110), a main pipe (120) and an electrode assembly (130); the container (10) and the main pipe (120) are both supported on the supporting mechanism (110), and the main pipe (120) comprises an ionization tube (121) and a connecting pipe (122) connected to each other; The ionization tube (121) has a diameter matching the opening of the container (10), and extends from the opening of the container (10) into the container (10), and the support mechanism (110) and the main pipeline (120) are both sealed and connected to the opening of the container (10); the electrode assembly (130) is located in the ionization tube (121), and the side wall of the ionization tube (121) is evenly distributed with discharge holes; the vacuum pipeline assembly (200), the inflation pipeline assembly (300) and the oxygen supply coating pipeline assembly (400) are all connected to the ionization tube (121) through the connecting pipe (122).

2. The plasma coating system for containers according to claim 1, characterized in that: It also includes a microwave generator (500) adapted to abut against the outer side wall of the container (10); The microwave generators (500) are arranged in plurality and are evenly distributed around the periphery of the container (10) along the circumference of the container (10).

3. The plasma coating system for containers according to claim 1, characterized in that: The electrode assembly (130) comprises a cathode electrode and an anode electrode, one of the cathode electrode and the anode electrode is distributed in a spiral shape along the axial direction of the ionization tube (121), and the other of the cathode electrode and the anode electrode extends along the axial direction of the ionization tube (121) to form an ionization zone between the cathode electrode and the anode electrode.

4. The plasma coating system for containers according to any one of claims 1 to 3, characterized in that: It also includes a pressure gauge (600) and a connecting pipe (122) valve, both of which are connected to the connecting pipe (122) and are suitable for measuring the pressure of the connecting pipe (122) and regulating the opening of the connecting pipe (122).

5. The plasma coating system for containers according to claim 4, characterized in that: The vacuum pipeline assembly (200) comprises a vacuum pump (210), a negative pressure pipeline (220) and a negative pressure valve (230); the negative pressure valve (230) is arranged on the negative pressure pipeline (220) to control the opening and closing of the negative pressure pipeline (220); and the two ends of the negative pressure pipeline (220) are respectively connected to the connecting pipe (122) and the vacuum pump (210); The negative pressure valve (230) is communicatively connected with the pressure gauge (600) to form a negative pressure feedback control loop of the negative pressure valve (230).

6. The plasma coating system for containers according to claim 5, characterized in that: The inflation pipeline assembly (300) comprises an inert gas cylinder (310), an inflation pump (320), an inflation valve (330) and an inflation pipeline (340); the inert gas cylinder (310) is in communication with the inflation pump (320); the inflation valve (330) is arranged on the inflation pipeline (340); and two ends of the inflation pipeline (340) are respectively in communication with the inflation pump (320) and the connecting pipe (122); The inflation pipeline assembly (300) further includes an inflation gas flow meter (350) for detecting the gas flow of the inflation pump (320) provided between the inflation pump (320) and the main pipeline (120); the inflation valve (330) is communicatively connected with the pressure gauge (600) and the inflation gas flow meter (350) to form an inflation feedback control loop of the inflation valve (330).

7. The plasma coating system for containers according to claim 6, characterized in that: The oxygen supply coating pipeline assembly (400) comprises an oxygen cylinder (410), an oxygen pump (420), a pulse generator (430), a former (440) and a raw material tank (450); The oxygen cylinder (410) is in communication with an inlet end of the oxygen pump (420); The outlet end of the former (440) is in communication with the connecting pipe (122); The outlet end of the raw material tank (450) is connected to the material inlet end of the former (440), and the raw material tank (450) can store silicon particles or silicon powder; A first output end and a second output end extend from the oxygen pump (420), the first output end being connected to the inlet end of the pulse generator (430), and the outlet end of the pulse generator (430) being connected to the gas inlet end of the former (440); the second output end being connected to the downstream area of ​​the raw material tank (450) along which the raw material is output, so as to form a fluidized area for forming the material in the downstream area of ​​the raw material tank (450); The oxygen supply coating pipeline assembly (400) further comprises an oxygen supply gas flow meter (460) and an oxygen supply regulating valve (470), wherein the oxygen supply regulating valve (470) and the oxygen supply gas flow meter (460) are both arranged between the first output end and the pulse generator (430), and the oxygen supply gas flow meter (460) is communicatively connected with the oxygen supply regulating valve (470) to form an oxygen supply feedback control loop of the oxygen supply regulating valve (470); The oxygen pump (420) is in communication connection with the valve of the connecting pipe (122) to form a mixed medium feedback control loop of the valve of the connecting pipe (122) The oxygen supply coating pipeline assembly (400) also includes a mixed medium flow meter (480) arranged on the connecting pipe (122), and a discharge regulating valve (490) arranged on the outlet end of the raw material tank (450). The mixed medium flow meter (480) and the discharge regulating valve (490) are communicatively connected to form a discharge feedback control loop for adjusting the discharge regulating valve (490).

8. The plasma coating system for containers according to claim 7, characterized in that: It also includes a pressure relief pipeline assembly (700), wherein the pressure relief pipeline assembly (700) includes a pressure relief pipeline (710) connected to the connecting pipe (122), and a pressure relief valve (720) arranged on the pressure relief pipeline (710).

9. The plasma coating system for containers according to claim 1, characterized in that: The support mechanism (110) comprises a base (111), a positioning boss (112) connected to the base (111), and a fastening sleeve (113); the open end of the container (10) can be supported on the base (111) and positioned by the positioning boss (112); and the fastening sleeve (113) can lock the open end of the container (10) with the base (111); The positioning boss (112) can extend from the open end of the container (10) into the container (10), and the fastening sleeve (113) can fasten the outer wall of the open end of the container (10); The opening of the container (10) is sealedly connected to the base (111), and the main pipeline (120) passes through the base (111) and is sealedly connected to the base (111), so that the opening of the container (10) and the main pipeline (120) are kept sealed.

10. A coating method, characterized in that: Applied to the plasma coating system for containers as claimed in any one of claims 1 to 9, the coating method comprising: S1: supporting the container (10) on the supporting mechanism (110); S2: closing the inflation pipeline assembly (300) and the oxygen supply coating pipeline assembly (400), and opening the vacuum pipeline assembly (200) to pump the internal pressure of the container (10) to a first pressure; S3: closing the vacuum pipeline assembly (200) and the oxygen supply and coating pipeline assembly (400), and opening the gas charging pipeline assembly (300) to charge the interior of the container (10) with an inert gas; S4: closing the vacuum pipeline assembly (200) and the gas charging pipeline assembly (300), opening the oxygen supply coating pipeline assembly (400), inputting a mixed medium of oxygen and coating material into the ionization tube (121), and energizing the electrode assembly (130).

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