Corona roller for plastic film printing

Abstract

The utility model discloses a corona roller for plastic film printing, which comprises a corona roller main body, the corona roller main body is a hollow structure with two open ends, the two ends of the corona roller main body are respectively provided with a plugging structure, and a cavity of the corona roller main body is filled with cooling liquid. According to the corona roller, the two ends of the corona roller body are blocked to form the closed cavity, the cooling liquid is injected into the cavity, the cooling liquid is used for cooling the corona roller body, and the temperature of the corona roller body can be prevented from being too high; the grooves are formed in the inner wall of the corona roller main body, so that the inner surface area of the corona roller main body is increased, the corona roller main body can be in contact with cooling liquid in a larger area, and the cooling and heat dissipation effects on the corona roller main body are further improved; according to the corona roller, the surface of the corona roller body is sleeved with the outer cylinder, even if the outer cylinder is abraded and damaged in use, only the outer cylinder needs to be replaced, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of corona rollers, in particular to a corona roller for printing plastic films. Background Art

[0002] In order to meet the needs of polypropylene film processing for composite packaging, printing and coating, BOPP film must be surface treated. There are two methods of surface treatment: flame treatment and corona treatment, of which corona treatment is the most common. The principle of corona treatment is to apply high-frequency voltage to the electrode to ionize and discharge the air on the film treatment surface adjacent to the electrode. The high-energy particles of the ionized gas quickly impact the running film under the action of the strong electric field, breaking the chemical bonds of the surface molecular chains and degrading them. The insulation performance of the corona roller, which is located under the polypropylene film and plays a supporting and clamping role during its operation, is crucial to the effect of corona treatment.

[0003] There are two types of corona rollers currently used. One is a ceramic roller, which uses ceramic materials as the main component of the corona roller. It has good insulation performance and long service life. However, due to its material, it will generate a lot of heat during the operation, causing the plastic film on its surface to be easily burned and damaged. The other type is a silicone roller, which is widely used because of its low price. However, the silicone roller is easy to age and deform under the impact of high pressure, and its service life is short. In addition, the worn silicone roller needs to be replaced as a whole, resulting in high cost of use. Utility Model Content

[0004] In view of the problems existing in the existing corona roller for printing plastic films, the utility model is proposed.

[0005] Therefore, the purpose of the utility model is to provide a corona roller for printing plastic film, which solves the problem that there are two types of corona rollers currently used. One is a ceramic roller, which uses ceramic material as the main component of the corona roller, has good insulation performance and long service life, but due to its material, a large amount of heat will be generated during the operation, causing the plastic film on its surface to be easily burned and damaged. The other type of silicone roller is widely used due to its low price, but the silicone roller is easily aged and deformed under the impact of high pressure, and its service life is short; and the worn silicone roller needs to be replaced as a whole, resulting in a high cost of use.

[0006] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A corona roller for printing plastic film comprises a corona roller body. The corona roller body is a hollow structure with two ends opened. Both ends of the corona roller body are provided with blocking structures. Cooling liquid is injected into the cavity of the corona roller body.

[0008] As a preferred solution of a corona roller for plastic film printing described in the utility model, a first sealing disc is installed on the left end of the corona roller body by bolts, and a liquid injection port connected to the inner cavity of the corona roller body is provided on the first sealing disc, a first sealing ring is provided between the first sealing disc and the left end of the corona roller body, and a first joint is welded on the first sealing disc.

[0009] As a preferred solution of a corona roller for plastic film printing described in the utility model, a second sealing disc is installed on the right end of the corona roller body by bolts, a second sealing ring is provided between the second sealing disc and the right end of the corona roller body, and a second joint is welded on the second sealing disc.

[0010] As a preferred solution of the corona roller for plastic film printing described in the utility model, wherein: the main body of the corona roller is set to be made of ceramic material.

[0011] As a preferred solution of the corona roller for plastic film printing described in the utility model, grooves are evenly opened on the inner wall of the cavity of the corona roller body, and the depth of the grooves is more than half of the thickness of the corona roller body.

[0012] As a preferred solution of the corona roller for plastic film printing described in the utility model, an outer sleeve is sleeved on the corona roller body, the outer sleeve is set to be made of silicone material, and the two ends of the outer sleeve are bonded to the corona roller body by glue.

[0013] As a preferred solution of the corona roller for plastic film printing described in the utility model, a pressure relief valve is fixedly installed on the first blocking disc.

[0014] Compared with existing technologies:

[0015] 1. The corona roller body is hollowed out and its two ends are sealed to form a closed cavity. Coolant is injected into the cavity and the coolant is used to cool the corona roller body, thereby preventing the corona roller body from being overheated.

[0016] 2. By arranging grooves on the inner wall of the corona roller body, the inner surface area of ​​the corona roller body is increased, so that a larger area can be in contact with the coolant, thereby further improving the cooling and heat dissipation effect of the corona roller body.

[0017] 3. By sleeve-arranging the outer cylinder on the surface of the corona roller body, even if the outer cylinder is worn out during use, only the outer cylinder needs to be replaced, thus reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A schematic diagram of the structure provided for Example 1 of the utility model;

[0019] Figure 2 A cross-sectional view of a corona roller body provided in Example 1 of the utility model;

[0020] Figure 3 A schematic diagram of the structure provided for Embodiment 2 of the present utility model;

[0021] Figure 4 A schematic diagram of the structure provided for Embodiment 3 of the present utility model;

[0022] Figure 5 This is a schematic diagram of the structure provided for Example 4 of the utility model.

[0023] In the figure: a corona roller body 1, a first joint 2, a second joint 3, a liquid injection port 4, a groove 5, a first sealing ring 6, a first blocking disc 7, a second blocking disc 8, a second sealing ring 9, a cavity 10, an outer sleeve 11, a through hole 12, and a pressure relief valve 13. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Embodiment 1:

[0026] The utility model provides a corona roller for printing plastic film. Figure 1-2 , including a corona roller body 1, which is a hollow structure with openings at both ends. Both ends of the corona roller body 1 are provided with blocking structures. Cooling liquid is injected into the cavity of the corona roller body 1. Under the action of the cooling liquid, the temperature of the corona roller body 1 is prevented from being too high, thereby playing a role in cooling the corona roller body 1.

[0027] A first blocking disc 7 is installed at the left end of the corona roller body 1 by bolts, and a liquid injection port 4 connected to the inner cavity of the corona roller body 1 is provided on the first blocking disc 7, a first sealing ring 6 is provided between the first blocking disc 7 and the left end of the corona roller body 1, and a first joint 2 is welded on the first blocking disc 7; a second blocking disc 8 is installed at the right end of the corona roller body 1 by bolts, a second sealing ring 9 is provided between the second blocking disc 8 and the right end of the corona roller body 1, and a second joint 3 is welded on the second blocking disc 8; with the presence of the first sealing ring 6 and the second sealing ring 9, the inner cavity 10 of the corona roller body 1 is made into a closed cavity, thereby avoiding leakage of coolant.

[0028] The corona roller body 1 is made of ceramic material, and grooves 5 are evenly opened on the inner wall of the cavity 10 of the corona roller body 1. The depth of the grooves 5 is more than half of the thickness of the corona roller body 1, so that the coolant can contact the corona roller body 1 with the maximum area, thereby achieving the purpose of cooling and dissipating the corona roller body 1 to the greatest extent.

[0029] During specific use, coolant is injected into the cavity 10 of the corona roller body 1 through the liquid injection port 4, and in the presence of the groove 5, the corona roller body 1 can be in contact with the coolant over a large area, thereby effectively cooling the corona roller body 1 and preventing the corona roller body 1 from being overheated.

[0030] Embodiment 2:

[0031] Refer to the attached Figure 3 , which is different from Example 1, is that an outer sleeve 11 is sleeved on the corona roller body 1, and the outer sleeve 11 is made of silicone material. The two ends of the outer sleeve 11 are bonded to the corona roller body 1 by glue. Therefore, even if the outer sleeve 11 is worn and damaged, only the outer sleeve 11 needs to be replaced, and there is no need to replace the entire corona roller, thereby reducing the cost of use.

[0032] During specific use, coolant is injected into the cavity 10 of the corona roller body 1 through the liquid injection port 4, and with the presence of the groove 5, the corona roller body 1 can be in contact with the coolant over a large area, thereby effectively cooling the corona roller body 1 and the outer sleeve 1 to avoid over-high temperatures of the corona roller body 1 and the outer sleeve 1; and when the outer sleeve 11 cannot be used due to wear, the outer sleeve 11 can be replaced.

[0033] Embodiment 3:

[0034] Refer to the attached Figure 4 , which is different from Example 1, is that through holes 12 are evenly opened on the inner wall of the cavity 10 of the corona roller body 1, an outer sleeve 11 is sleeved on the corona roller body 1, and the outer sleeve 11 is set to a silicone material. The two ends of the outer sleeve 11 are bonded to the corona roller body 1 by glue, so the outer sleeve 11 and the corona roller body 1 are sealed, thereby preventing the coolant in the corona roller body 1 from entering the gap between the corona roller body 1 and the outer sleeve 11 and overflowing; at this time, the inner wall of the outer sleeve 11 is also in direct contact with the coolant, further improving the cooling and heat dissipation of the outer sleeve 11.

[0035] During specific use, coolant is injected into the cavity 10 of the corona roller body 1 through the liquid injection port 4, and in the presence of the groove 5, the corona roller body 1 can be in contact with the coolant over a large area, thereby effectively cooling the corona roller body 1 and the outer sleeve 1 to avoid excessive temperatures of the corona roller body 1 and the outer sleeve 1, and the inner wall of the outer sleeve 11 is also in direct contact with the coolant, further improving the cooling and heat dissipation of the outer sleeve 11; and when the outer sleeve 11 cannot be used due to wear, the outer sleeve 11 can be replaced.

[0036] Embodiment 4:

[0037] Refer to the attached Figure 5 , which is different from Example 3, is that a pressure relief valve 13 is fixedly installed on the first blocking disc 7. At this time, the coolant is selected to have a boiling point of 38-41°C as the best, so that when the corona roller body 1 is working, its temperature rises, so that the coolant can boil, and the generated steam is discharged through the pressure relief valve 13, so that the air pressure in the corona roller body 1 is balanced, and the coolant is always 38-41°C, thereby ensuring that the corona roller body 1 is always at 38-41°C, meeting the temperature requirement of 38-41°C.

[0038] During specific use, coolant is injected into the cavity 10 of the corona roller body 1 through the injection port 4. The coolant with a boiling point of 38-41°C is the best. In addition, with the presence of the groove 5, the corona roller body 1 can be in contact with the coolant over a large area, thereby effectively cooling the corona roller body 1 and the outer sleeve 1 to avoid excessive temperatures of the corona roller body 1 and the outer sleeve 1. The inner wall of the outer sleeve 11 is also in direct contact with the coolant, further improving the cooling and heat dissipation of the outer sleeve 11. When the corona roller body 1 and the outer sleeve 11 heat up and the coolant boils, the steam is discharged through the pressure relief valve 13, thereby balancing the air pressure in the corona roller body 1, and the coolant is always 38-41°C, thereby ensuring that the corona roller body 1 is always at 38-41°C and meeting the temperature requirement of 38-41°C. When the outer sleeve 11 cannot be used due to wear, the outer sleeve 11 can be replaced.

[0039] In specific use, coolant is injected into the cavity 10 of the corona roller body 1 through the liquid injection port 4, and in the presence of the groove 5, the corona roller body 1 can be in contact with the coolant over a large area, thereby effectively cooling the corona roller body 1 and the outer sleeve 1, avoiding the corona roller body 1 and the outer sleeve 1 from being too hot, and the inner wall of the outer sleeve 11 is also in direct contact with the coolant, further improving the cooling and heat dissipation of the outer sleeve 11; and when the outer sleeve 11 cannot be used due to wear, the outer sleeve 11 can be replaced. Although the utility model has been described above with reference to the embodiment, various improvements can be made to it and the components thereof can be replaced with equivalents without departing from the scope of the utility model. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the utility model can be used in combination with each other in any way, and the fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A corona roller for printing plastic film, comprising a corona roller body (1), characterized in that: The corona roller body (1) is a hollow structure with openings at both ends, both ends of the corona roller body (1) are provided with blocking structures, and a cooling liquid is injected into the cavity of the corona roller body (1); Through holes (12) are evenly arranged on the inner wall of the cavity (10) of the corona roller body (1); an outer sleeve (11) is sleeved on the corona roller body (1); the outer sleeve (11) is made of silicone material; and both ends of the outer sleeve (11) are bonded to the corona roller body (1) by glue.

2. A corona roller for plastic film printing according to claim 1, characterized in that: A first blocking disc (7) is installed at the left end of the corona roller body (1) by means of bolts; a liquid injection port (4) communicating with the inner cavity of the corona roller body (1) is provided on the first blocking disc (7); a first sealing ring (6) is provided between the first blocking disc (7) and the left end of the corona roller body (1); and a first joint (2) is welded to the first blocking disc (7).

3. A corona roller for plastic film printing according to claim 1 or 2, characterized in that: A second sealing disc (8) is mounted on the right end of the corona roller body (1) via bolts, a second sealing ring (9) is provided between the second sealing disc (8) and the right end of the corona roller body (1), and a second joint (3) is welded to the second sealing disc (8).

4. A corona roller for plastic film printing according to claim 3, characterized in that: The corona roller body (1) is made of ceramic material.

5. A corona roller for plastic film printing according to claim 2, characterized in that: A pressure relief valve (13) is fixedly mounted on the first blocking disc (7).

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