Corona roller assembly for increasing the surface tension of an EVA film

Abstract

The utility model belongs to the technical field of corona roller assembly, disclose a kind of corona roller assembly for improving the surface tension of EVA film, including corona treatment main part;Multiple electrode units of corona roller body adopt the layered design of "main electrode+auxiliary electrode", main electrode guarantees the discharge intensity of central area, auxiliary electrode makes up edge electric field attenuation, so that film surface tension deviation is controlled within 3mN / m;Electrode unit is evenly embedded in the outside of insulating protective layer, cooperate with the uniform speed conveying of driving roller, realize EVA film full-width even processing, surface tension can be stably promoted to 40mN / m or more;Efficient heat dissipation channel is formed by the spiral cooling cavity in the inside of metal roller core and turbulence boss, cooling water enters after water inlet joint, absorbs heat in spiral path sufficiently, adjusts flow rate by flow control valve, ensure that the temperature of roller core is less than or equal to 45 DEG C;Sealing flange prevents cooling water leakage, avoids insulating protective layer damp aging, and electrode unit service life is extended by more than 50%.

Description

Technical Field

[0001] This utility model relates to the field of corona roller assembly technology, and in particular to a corona roller assembly for improving the surface tension of EVA film. Background Technology

[0002] EVA film is widely used in photovoltaic encapsulation, packaging printing, and building waterproofing due to its excellent flexibility, chemical resistance, and adhesive properties. However, EVA film has a low surface tension (typically ≤30mN / m), resulting in insufficient adhesion to adhesives and inks, which can easily lead to delamination and blurry printing. Corona treatment is a mainstream technology for improving the surface tension of EVA film. It uses high-voltage discharge to oxidize and polarize the molecules on the film surface, thereby increasing surface activity. Existing corona roller assemblies have many limitations: poor processing uniformity, traditional corona rollers mostly adopt a single-row electrode design, resulting in uneven electric field distribution on the roller surface, leading to a film surface tension deviation >5mN / m, weaker processing effect in the edge area than in the center area, and insufficient heat dissipation capacity, generating a large amount of heat during corona discharge, and the metal roller core is prone to aging of the insulation layer due to excessive temperature, which can easily shorten the electrode life. Therefore, we propose a corona roller assembly that improves the surface tension of EVA film. Utility Model Content

[0003] The purpose of this invention is to provide a corona roller assembly for improving the surface tension of EVA films, thus solving the existing problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A corona roller assembly for improving the surface tension of EVA film includes a corona treatment body, a drive roller and a corona roller body are rotatably mounted on the inner side of the corona treatment body, the corona roller body is mounted on the drive roller, and a high voltage generator is fixedly mounted on the top of the corona treatment body, the high voltage generator being electrically connected to the corona roller body. The corona roller body includes a metal roller core, an insulating protective layer, and multiple sets of electrode units. The insulating protective layer is fixedly sleeved on the outside of the high voltage generator. The multiple sets of electrode units are uniformly embedded on the outside of the insulating protective layer. The multiple sets of electrode units include a main electrode and an auxiliary electrode. The auxiliary electrode is symmetrically distributed on both sides of the main electrode, and the height of the auxiliary electrode is lower than the height of the main electrode.

[0005] Preferably, a spiral cooling chamber is formed on the inner side of the metal roller core, a water inlet connector is fixedly installed at one end of the spiral cooling chamber, and a water outlet connector is fixedly installed at the other end of the spiral cooling chamber. Both the water inlet connector and the water outlet connector extend to the outer side of the corona roller body, and a flow control valve is fixedly installed on the outer side of the water inlet connector.

[0006] Preferably, two sliding brackets are fixedly installed on the inner side of the corona treatment body, and a guide groove is opened on the inner side of the sliding bracket. An adjusting slider is slidably installed on the inner side of the guide groove. Both ends of the corona roller body are rotatably installed on the inner side of the adjusting slider. An adjusting motor is fixedly installed on the top of the sliding bracket, and an adjusting screw is fixedly installed on the output end of the adjusting motor. The adjusting slider is threaded on the outer side of the adjusting screw.

[0007] Preferably, a tension detection frame is fixedly installed on the inner side of the corona treatment body, a detection roller is rotatably installed on the inner side of the tension detection frame, a pressure sensor is fixedly installed on the outer side of the detection roller, the pressure sensor is in contact with the surface of the EVA film, a tension display screen is fixedly installed on the outer side of the corona treatment body, and the pressure sensor is electrically connected to the tension display screen.

[0008] Preferably, a cleaning bracket is fixedly installed on the inner side of the corona treatment body, and an elastic telescopic rod is fixedly installed on the inner side of the cleaning bracket. A cleaning scraper and a dust removal brush are fixedly installed at one end of the elastic telescopic rod. The cleaning scraper and the dust removal brush are both in contact with the outer side of the corona roller body, and the cleaning scraper is located on one side of the dust removal brush.

[0009] Preferably, an ion air bar is fixedly installed on the inner side of the corona treatment body, the ion air bar is located on one side of the corona roller body, and multiple air outlets are fixedly installed on the outer side of the ion air bar, the air outlets being arranged facing the surface of the EVA film.

[0010] Preferably, a protective cover is fixedly installed on the outer side of the corona treatment body, an observation window is fixedly installed on the inner side of the protective cover, an ultraviolet sensor is fixedly installed on the inner side of the protective cover, an alarm light is fixedly installed on the outer side of the corona treatment body, and the ultraviolet sensor is electrically connected to the alarm light.

[0011] Preferably, conductive slip rings are fixedly installed at both ends of the metal roller core, the high voltage generator is electrically connected to the conductive slip rings through wires, and a grounding terminal is fixedly installed at the bottom of the corona treatment body, the grounding terminal being electrically connected to the metal roller core through wires.

[0012] Preferably, a turbulence-inducing protrusion is fixedly installed on the inner side of the spiral cooling cavity, the turbulence-inducing protrusion is distributed in a spiral shape, and a sealing flange is fixedly installed on the outer side of both the water inlet connector and the water outlet connector.

[0013] Preferably, a rolling bearing is fixedly installed on the inner side of the adjusting slider, both ends of the corona roller body are in contact with the inner side of the rolling bearing, and a wear-resistant liner is fixedly installed on the inner side of the guide groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention discloses a corona roller assembly for improving the surface tension of EVA films. The corona roller body employs a layered design of "main electrode + auxiliary electrode" for multiple electrode units. The main electrode ensures the discharge intensity in the central area, while the auxiliary electrode compensates for the attenuation of the electric field at the edges, keeping the film surface tension deviation within 3mN / m. The electrode units are uniformly embedded on the outside of the insulating protective layer. Combined with the uniform conveying speed of the drive roller, this achieves uniform processing of the entire EVA film, and the surface tension can be stably increased to over 40mN / m. The spiral cooling chamber on the inner side of the metal roller core and the turbulence protrusions form an efficient heat dissipation channel. After the cooling water enters through the water inlet connector, it fully absorbs heat in the spiral path. The flow rate is adjusted by the flow control valve to ensure that the roller core temperature is ≤45℃. The sealing flange prevents cooling water leakage, avoids moisture aging of the insulating protective layer, and extends the service life of the electrode units by more than 50%. This invention relates to a corona roller assembly for improving the surface tension of EVA films. The sliding bracket and adjusting slider work together, allowing for the installation of different corona roller bodies by adjusting the adjusting screw driven by the adjusting motor. Rolling bearings and wear-resistant liners ensure smooth adjustment, preventing unstable discharge due to mechanical vibration. An elastic telescopic rod on the cleaning bracket drives a cleaning scraper and dust-removing brush to adhere tightly to the surface of the corona roller body, removing residues from the electrodes in real time. The elastic design ensures stable contact pressure, preventing damage to the electrodes while achieving thorough cleaning, reducing downtime for cleaning, and extending the continuous operating time of the equipment to over 8 hours. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the present utility model; Figure 3 This is a partial three-dimensional structural diagram of the metal roller core and insulating protective layer in this utility model. Figure 4 This is a partial three-dimensional structural diagram of the adjusting slider and sliding bracket in this utility model; Figure 5 This is a three-dimensional structural diagram of the main electrode and auxiliary electrode parts in this utility model.

[0017] In the diagram: 1. Corona treatment main body; 2. Drive roller; 3. Corona roller body; 4. High-voltage generator; 5. Spiral cooling chamber; 6. Water inlet connector; 7. Water outlet connector; 8. Flow control valve; 9. Sliding bracket; 10. Guide chute; 11. Adjusting slider; 12. Adjusting motor; 13. Adjusting screw; 14. Tension detection frame; 15. Detection roller; 16. Pressure sensor; 17. Tension display screen; 18. Cleaning bracket; 19. Elastic telescopic rod 20. Cleaning scraper; 21. Dust removal brush; 22. Ionizing air bar; 23. Air outlet; 24. Protective cover; 25. Observation window; 26. Ultraviolet sensor; 27. Alarm light; 28. Conductive slip ring; 29. ​​Grounding terminal; 30. Turbulence protrusion; 31. Sealing flange; 32. Rolling bearing; 33. Wear-resistant lining strip; 41. Metal roller core; 42. Insulating protective layer; 43. Multiple electrode units; 44. Main electrode; 45. Auxiliary electrode. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] refer to Figure 1-5A corona roller assembly for improving the surface tension of EVA film includes a corona treatment body 1. A drive roller 2 and a corona roller body 3 are rotatably mounted on the inner side of the corona treatment body 1. The corona roller body 3 is mounted on the drive roller 2. A high-voltage generator 4 is fixedly mounted on the top of the corona treatment body 1 and electrically connected to the corona roller body 3. The multiple electrode units 43 of the corona roller body 3 adopt a layered design of "main electrode 44 + auxiliary electrode 45". The main electrode ensures the discharge intensity in the central area, and the auxiliary electrode compensates for the attenuation of the electric field at the edge, so that the film surface tension deviation is controlled within 3mN / m. The electrode units are uniformly embedded on the outside of the insulating protective layer 42. With the uniform conveying of the drive roller 2, the EVA film is uniformly treated across the entire width, and the surface tension can be stably increased to above 40mN / m. The roller body 3 includes a metal roller core 41, an insulating protective layer 42, and multiple sets of electrode units 43. The insulating protective layer 42 is fixedly sleeved on the outside of the high voltage generator 4. The multiple sets of electrode units 43 are evenly embedded on the outside of the insulating protective layer 42. The multiple sets of electrode units 43 include a main electrode 44 and an auxiliary electrode 45. The auxiliary electrode 45 is symmetrically distributed on both sides of the main electrode 44, and the height of the auxiliary electrode 45 is lower than the height of the main electrode 44. In a further preferred embodiment of the present invention, a spiral cooling cavity 5 is provided on the inner side of the metal roller core 41. A water inlet connector 6 is fixedly installed at one end of the spiral cooling cavity 5, and a water outlet connector 7 is fixedly installed at the other end of the spiral cooling cavity 5. Both the water inlet connector 6 and the water outlet connector 7 extend to the outside of the corona roller body 3. A flow control valve 8 is fixedly installed on the outside of the water inlet connector 6.

[0020] In a further preferred embodiment of this utility model, two sliding brackets 9 are fixedly installed on the inner side of the corona treatment body 1. A guide groove 10 is opened on the inner side of the sliding bracket 9, and an adjusting slider 11 is slidably installed on the inner side of the guide groove 10. The two ends of the corona roller body 3 are rotatably installed on the inner side of the adjusting slider 11. An adjusting motor 12 is fixedly installed on the top of the sliding bracket 9, and an adjusting screw 13 is fixedly installed on the output end of the adjusting motor 12. The adjusting slider 11 is threaded on the outer side of the adjusting screw 13. The spiral cooling cavity 5 on the inner side of the metal roller core 41 and the turbulence protrusion 30 form a high-efficiency heat dissipation channel. After the cooling water enters through the water inlet connector 6, it fills the spiral path. The heat is absorbed and the flow rate is adjusted by the flow control valve 8 to ensure that the roller core temperature is ≤45℃; the sealing flange 31 prevents cooling water leakage, avoids the insulation protective layer 42 from getting damp and aging, and extends the service life of the electrode unit by more than 50%; in a further preferred embodiment of this utility model, a tension detection frame 14 is fixedly installed on the inner side of the corona treatment body 1, a detection roller 15 is rotatably installed on the inner side of the tension detection frame 14, a pressure sensor 16 is fixedly installed on the outer side of the detection roller 15, the pressure sensor 16 is attached to the surface of the EVA film, a tension display screen 17 is fixedly installed on the outer side of the corona treatment body 1, and the pressure sensor 16 is electrically connected to the tension display screen 17.

[0021] In a further preferred embodiment of this utility model, a cleaning bracket 18 is fixedly installed on the inner side of the corona treatment body 1, and an elastic telescopic rod 19 is fixedly installed on the inner side of the cleaning bracket 18. A cleaning scraper 20 and a dust removal brush 21 are fixedly installed at one end of the elastic telescopic rod 19. Both the cleaning scraper 20 and the dust removal brush 21 are in contact with the outer side of the corona roller body 3, and the cleaning scraper 20 is located on one side of the dust removal brush 21. The cooperation between the sliding bracket 9 and the adjusting slider 11 can be achieved by adjusting the adjusting screw 13 driven by the adjusting motor 12. The precise adjustment range of the distance between the corona roller body 3 and the drive roller 2 is 0.1-5mm, which is suitable for EVA films of different thicknesses; the rolling bearing 32 and the wear-resistant liner 33 ensure that the adjustment process is stable and avoids unstable discharge caused by mechanical vibration; in a further preferred embodiment of this utility model, an ion air bar 22 is fixedly installed on the inner side of the corona treatment body 1, the ion air bar 22 is located on one side of the corona roller body 3, and multiple air outlets 23 are fixedly installed on the outer side of the ion air bar 22, with the air outlets 23 facing the surface of the EVA film.

[0022] In a further preferred embodiment of this utility model, a protective cover 24 is fixedly installed on the outer side of the corona treatment body 1, an observation window 25 is fixedly installed on the inner side of the protective cover 24, an ultraviolet sensor 26 is fixedly installed on the inner side of the protective cover 24, an alarm light 27 is fixedly installed on the outer side of the corona treatment body 1, and the ultraviolet sensor 26 is electrically connected to the alarm light 27.

[0023] In a further preferred embodiment of this utility model, conductive slip rings 28 are fixedly installed at both ends of the metal roller core 41, the high voltage generator 4 is electrically connected to the conductive slip rings 28 through wires, and a grounding terminal 29 is fixedly installed at the bottom of the corona treatment body 1, and the grounding terminal 29 is electrically connected to the metal roller core 41 through wires.

[0024] In a further preferred embodiment of this utility model, a turbulence protrusion 30 is fixedly installed on the inner side of the spiral cooling chamber 5. The turbulence protrusion 30 is distributed in a spiral shape. Sealing flanges 31 are fixedly installed on the outer sides of the water inlet connector 6 and the water outlet connector 7. The pressure sensor 16 of the tension detection frame 14 collects the membrane tension data in real time and displays it intuitively through the tension display screen 17, which facilitates the operator to adjust the parameters in time. The ion wind bar 22 eliminates the static charge on the membrane surface and avoids dust adsorption. The protective cover 24 is linked with the ultraviolet sensor 26 and the alarm light 27 to provide timely warning when the ultraviolet intensity exceeds the standard and prevent personnel burns. The conductive slip ring 28 and the grounding terminal 29 ensure reliable high-voltage conduction and avoid the risk of leakage. In a further preferred embodiment of this utility model, a rolling bearing 32 is fixedly installed on the inner side of the adjusting slider 11. The two ends of the corona roller body 3 are in contact with the inner side of the rolling bearing 32. A wear-resistant liner 33 is fixedly installed on the inner side of the guide groove 10.

[0025] The implementation principle of the corona roller assembly for improving the surface tension of EVA film in this application embodiment is as follows: The multiple electrode units 43 of the corona roller body 3 adopt a layered design of "main electrode 44 + auxiliary electrode 45". The main electrode ensures the discharge intensity in the central area, and the auxiliary electrode compensates for the attenuation of the electric field at the edge, so that the film surface tension deviation is controlled within 3mN / m; The electrode units are uniformly embedded on the outside of the insulating protective layer 42. With the uniform conveying of the drive roller 2, the EVA film is uniformly processed across the entire width, and the surface tension can be stably increased to more than 40mN / m; The spiral cooling cavity 5 on the inner side of the metal roller core 41 and the turbulence protrusion 30 form an efficient heat dissipation channel. After the cooling water enters through the water inlet connector 6, it fully absorbs heat in the spiral path. The flow rate is adjusted by the flow control valve 8 to ensure that the roller core temperature is ≤45℃; The sealing flange 31 prevents the cooling water from leaking, avoids the insulating protective layer 42 from getting damp and aging, and extends the service life of the electrode unit by more than 50%; The sliding bracket 9 and the adjusting slider 11 work together to drive the adjusting screw 13 via the adjusting motor 12, enabling the installation of different corona roller bodies 3. The rolling bearing 32 and the wear-resistant liner 33 ensure a smooth adjustment process and prevent discharge instability caused by mechanical vibration. The elastic telescopic rod 19 on the cleaning bracket 18 drives the cleaning scraper 20 and the dust removal brush 21 to adhere closely to the surface of the corona roller body 3, removing residues from the electrodes in real time. The elastic design ensures stable contact pressure, which neither damages the electrodes nor fails to thoroughly clean them, reducing the number of downtime cleanings and extending the continuous operation time of the equipment to more than 8 hours. The pressure sensor 16 of the tension testing frame 14 collects membrane tension data in real time and displays it intuitively on the tension display screen 17, making it easy for operators to adjust parameters in a timely manner; the ion air bar 22 eliminates static charge on the membrane surface and prevents dust adsorption; the protective cover 24 is linked with the ultraviolet sensor 26 and the alarm light 27 to provide timely warning when the ultraviolet intensity exceeds the standard, preventing personnel burns; the conductive slip ring 28 and the grounding terminal 29 ensure reliable high-voltage conduction and avoid the risk of leakage.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The corona roller assembly for improving the surface tension of EVA film provided by this utility model has been described in detail above. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A corona roller assembly for improving the surface tension of EVA film, characterized in that, include: A corona treatment body (1) is provided with a drive roller (2) and a corona roller body (3) rotatably mounted on its inner side. The corona roller body (3) is mounted on the drive roller (2). A high voltage generator (4) is fixedly mounted on the top of the corona treatment body (1). The high voltage generator (4) is electrically connected to the corona roller body (3). The corona roller body (3) includes a metal roller core (41), an insulating protective layer (42), and multiple sets of electrode units (43). The insulating protective layer (42) is fixedly sleeved on the outside of the high voltage generator (4). The multiple sets of electrode units (43) are uniformly embedded on the outside of the insulating protective layer (42). The multiple sets of electrode units (43) include a main electrode (44) and an auxiliary electrode (45). The auxiliary electrode (45) is symmetrically distributed on both sides of the main electrode (44), and the height of the auxiliary electrode (45) is lower than the height of the main electrode (44).

2. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, The inner side of the metal roller core (41) is provided with a spiral cooling chamber (5). A water inlet connector (6) is fixedly installed at one end of the spiral cooling chamber (5), and a water outlet connector (7) is fixedly installed at the other end of the spiral cooling chamber (5). Both the water inlet connector (6) and the water outlet connector (7) extend to the outer side of the corona roller body (3). A flow control valve (8) is fixedly installed on the outer side of the water inlet connector (6).

3. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, Two sliding brackets (9) are fixedly installed on the inner side of the corona treatment body (1). A guide groove (10) is provided on the inner side of the sliding bracket (9). An adjusting slider (11) is slidably installed on the inner side of the guide groove (10). The two ends of the corona roller body (3) are rotatably installed on the inner side of the adjusting slider (11). An adjusting motor (12) is fixedly installed on the top of the sliding bracket (9). An adjusting screw (13) is fixedly installed on the output end of the adjusting motor (12). The adjusting slider (11) is threadedly installed on the outer side of the adjusting screw (13).

4. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, A tension detection frame (14) is fixedly installed on the inner side of the corona treatment body (1), a detection roller (15) is rotatably installed on the inner side of the tension detection frame (14), a pressure sensor (16) is fixedly installed on the outer side of the detection roller (15), the pressure sensor (16) is attached to the surface of the EVA film, a tension display screen (17) is fixedly installed on the outer side of the corona treatment body (1), and the pressure sensor (16) is electrically connected to the tension display screen (17).

5. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, A cleaning bracket (18) is fixedly installed on the inner side of the corona treatment body (1). An elastic telescopic rod (19) is fixedly installed on the inner side of the cleaning bracket (18). A cleaning scraper (20) and a dust removal brush (21) are fixedly installed at one end of the elastic telescopic rod (19). The cleaning scraper (20) and the dust removal brush (21) are both in contact with the outer side of the corona roller body (3), and the cleaning scraper (20) is located on one side of the dust removal brush (21).

6. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, An ion air bar (22) is fixedly installed on the inner side of the corona treatment body (1). The ion air bar (22) is located on one side of the corona roller body (3). Multiple air outlets (23) are fixedly installed on the outer side of the ion air bar (22). The air outlets (23) are set towards the surface of the EVA film.

7. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, A protective cover (24) is fixedly installed on the outside of the corona treatment body (1), an observation window (25) is fixedly installed on the inside of the protective cover (24), an ultraviolet sensor (26) is fixedly installed on the inside of the protective cover (24), an alarm light (27) is fixedly installed on the outside of the corona treatment body (1), and the ultraviolet sensor (26) is electrically connected to the alarm light (27).

8. The corona roller assembly for improving the surface tension of EVA film according to claim 1, characterized in that, The metal roller core (41) is fixedly installed with conductive slip rings (28) at both ends. The high voltage generator (4) is electrically connected to the conductive slip rings (28) through wires. The bottom of the corona treatment body (1) is fixedly installed with a grounding terminal (29). The grounding terminal (29) is electrically connected to the metal roller core (41) through wires.

9. A corona roller assembly for improving the surface tension of EVA film according to claim 2, characterized in that, The inner side of the spiral cooling chamber (5) is fixedly installed with a turbulence protrusion (30), which is spirally distributed. The outer sides of the water inlet connector (6) and the water outlet connector (7) are both fixedly installed with sealing flanges (31).

10. A corona roller assembly for improving the surface tension of EVA film according to claim 3, characterized in that, A rolling bearing (32) is fixedly installed on the inner side of the adjusting slider (11), and the two ends of the corona roller body (3) are in contact with the inner side of the rolling bearing (32). A wear-resistant liner (33) is fixedly installed on the inner side of the guide groove (10).

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