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Flexo platemaking equipment is used to make resin plates into plates for printing. Plate making is an indispensable process for flexo printing. This process determines the quality of printing plates and thus plays a decisive role in the printing quality.
The currently used flexographic platemaking process is generally divided into six steps, back exposure, main exposure, rinse, drying, de-bonding, and post-exposure. In contrast, the plate making apparatus has an exposure unit, a flushing unit, a drying unit, a de-bonding unit, and the like to complete the six plate making processes.
one. The exposure unit exposure section is mainly used to complete the back exposure and main exposure:
Plate supporting film up, protective film down, flat exposure in the exposure drawer accept exposure, UV-A through the support film to make the photosensitive resin polymerization, the main role of the establishment of the substrate of the plate, as the basis of relief, strengthen the polyester support The binding force of the film and the photosensitive resin layer. Back exposure time was obtained by back exposure testing.
Plate supporting film down, tiled in the exposure drawer, the protective film is torn off, the negative film containing the pattern is attached to the photosensitive resin, the vacuum film is attached to the film, the vacuum pump is turned on, and the film is closely attached to the photosensitive resin Together, UV-A through the vacuum film and film pattern, the photosensitive resin cross-linked polymerization to form invisible insoluble relief pattern. In this process, the blackness and vacuum of the film are the key factors. The darkness ensures that the no-pattern part completely blocks the UV light, and the vacuum degree ensures that the film and the photosensitive resin are closely attached to each other to reduce residual air from generating halation during the exposure process. Affecting the plate-making effect. The main exposure time is determined by the main exposure test.
Therefore, the exposure department is equipped with:
1. The exposing section of the plate making equipment is equipped with UV-A lamps of different sizes and powers. The total light receiving area varies from 70 to 110 mW/cm2, depending on the size of the series and model. In the same exposure unit, the received light must be uniform and the positive and negative deviations should not exceed 3%.
2. With accurate exposure timing device.
3. With vacuum adsorption capacity, it is generally required to generate negative pressure above 0.8 bar. On the one hand, the close combination of the film and the plate is kept, and the halo phenomenon is weakened. On the other hand, the ozone generated during the plate making process is eliminated in time.
4. The sealing conditions are good to avoid the harm to the human body caused by ultraviolet light diarrhea.
From the perspective of use and maintenance:
1. Since the lamp's design life is generally around 600 hours, the light intensity gradually weakens during use, and the exposure time should gradually increase. On the other hand, since the energy release is not stable when the new lamp is used, the lamp is turned on for 15-20 minutes before it begins production.
2. The dust on the surface of the lamp is cleaned with alcohol every two weeks to ensure the luminous efficiency of the lamp.
3. Clean and maintain the vacuum pump every two months to ensure that the vacuum is at 0.8 bar negative pressure.
4. Keep the interior clean and prevent dust from affecting the quality of the printing.
5. Keep the vacuum membrane clean and reject any solvent contact to reduce the life and light transmission of the vacuum membrane.
6. Drawer slides remain lubricated. Due to the long pullout of the slides, heavy pressure is strictly forbidden to damage the slides.
two. The function of the flushing unit is to make the photosensitive resin that does not receive ultraviolet rays and cross-linked during the exposure process. Under the action of the brush on the flushing device, it dissolves in the flushing solvent, and the photosensitive resin that receives the ultraviolet irradiation is retained and formed. Relief.
In the process of rinsing, a high-quality flexographic plate is produced. The automated plate-washing equipment must have the following functions:
1, degree control function. In different areas of the country, the temperature is different, but the solvent (generally n-butanol and tetrachloroethylene with a specific gravity of 1.38-1.42) is generally the best at 20 degrees Celsius, and the flushing quality is the most stable, so the temperature of the equipment solvent tank can be set and Keep the temperature constant.
2. Set the speed of washing plates and control the time of washing plates to suit the flushing of various plates.
3, to automatically adjust the height of the brush to adapt to different thickness of the plate 4, can automatically sense and calculate the length of the plate to automatically control the movement of the brush, the circulation of the circulation of the syrup, the drying of the plate material and other mechanical actions.
5, brush hardness moderate, reasonable arrangement, that is not too soft so that the plate will not be washed clean, not too hard and lose a small dot.
6, can be automatically pre-drying (generally 60 degrees Celsius), plate material out without washing liquid, which is conducive to cleaning.
7. The fresh potion supply function ensures that the base plate of washed plates is clean and the pattern details are clear.
8. The equipment is sealed well and the negative pressure gas is eliminated to ensure a good working environment.
Regarding the flushing department maintenance:
a) Ensure that the temperature controls the amount of refrigerant and ensure the temperature control function.
b) Take care to remove impurities in the solvent by filtration, and prevent the clogging of the transfer line and the solenoid valve.
c) Frequent cleaning of the solidified resin reduces the resistance to movement of various brushes and reduces the extra load on the drag motor.
d) Because the brush is often in contact with solvents, its hardness will gradually increase, as well as affect the quality of the plate wash, so pay attention to changes in its hardness, if necessary, to be replaced.
e) Ensure good lubrication of mechanical moving parts such as brushes and plates.
f) Keep the room clean and clean the exhaust gas blower every two months to ensure the working efficiency.
Third, the drying unit plate material in the washing process, long contact with the solvent, inhaled the solvent to produce expansion, through the hot air drying, the solvent in the plate material volatilized to restore the original size and thickness.
Drying function:
1. With a constant temperature control function, the general drying temperature is set at about 60 degrees Celsius, the temperature is too high for the plate is not good, too low the evaporation rate is too slow is not conducive to work efficiency.
2. With the function of volatile solvent gas discharge, the density of volatile solvent gas in the drying drawer gradually increases during the drying process. If no negative pressure is eliminated, it will block the drying of the plate.
3. The equipment is well sealed and a good working environment is guaranteed.
In terms of equipment maintenance To keep the drawer slide well-lubricated, this drawer has a high temperature, the grease is easy to melt, volatilizes, and the volatilized solvent gas condenses and dissolves, which is not conducive to the lubrication of the drawer slide, and should be lubricated once every two days.
2. When the drawer is pulled out a lot, do not press it heavily to prevent it from damaging the drawer slides.
3. The solvent gas exhaust fan is cleaned every two months to maintain good work efficiency.
four. After the desorption unit plate is dry, the surface is still sticky, so do not touch the surface of other objects, do not touch the surface of the resin by hand, so as to avoid leaving fingerprints. Detackification is the use of 220-260 nm UV light to irradiate the resin plate, so that the surface of the plate to remove the viscosity. Note: Excessive detackification can cause cracking or cracking during use.
This process requires equipment:
1. According to the different models and sizes of equipment, UV-C lamps with different power and quantity have average illumination.
2, the time setting function, in order to accurately control the de-adhesion time.
3, the drawer is good sealing, no UV light leakage.
Corresponding, maintenance:
1. The dust on the surface of the tube is cleaned with alcohol every two weeks to ensure the luminous efficiency of the lamp.
2. The drawer slides are kept lubricated. Because the slide rails are pulled out for a long time, heavy pressure is strictly forbidden to damage the slide rails.
3. Keep the interior clean and prevent dust from affecting the quality of the print.
Fives. The post-exposure exposure is the finishing work of the plate-making. Under the irradiation of UV-A, the photosensitive resin of the printing plate is completely polymerized. This step determines the final hardness of the plate, the imprint resistance, and the resistance to solvents and pressure. Post-exposure is generally performed in the exposure section, and some devices perform de-bonding and post-exposure simultaneously. Save time and improve work efficiency. As shown in the figure below, equipment allocation and maintenance will no longer be split.
The above describes the process of plate making in the flexography, the corresponding functions of the plate making equipment, and the matters needing attention in the maintenance of the use process. We hope to help in the actual production of your plate making.
The currently used flexographic platemaking process is generally divided into six steps, back exposure, main exposure, rinse, drying, de-bonding, and post-exposure. In contrast, the plate making apparatus has an exposure unit, a flushing unit, a drying unit, a de-bonding unit, and the like to complete the six plate making processes.
one. The exposure unit exposure section is mainly used to complete the back exposure and main exposure:
Plate supporting film up, protective film down, flat exposure in the exposure drawer accept exposure, UV-A through the support film to make the photosensitive resin polymerization, the main role of the establishment of the substrate of the plate, as the basis of relief, strengthen the polyester support The binding force of the film and the photosensitive resin layer. Back exposure time was obtained by back exposure testing.
Plate supporting film down, tiled in the exposure drawer, the protective film is torn off, the negative film containing the pattern is attached to the photosensitive resin, the vacuum film is attached to the film, the vacuum pump is turned on, and the film is closely attached to the photosensitive resin Together, UV-A through the vacuum film and film pattern, the photosensitive resin cross-linked polymerization to form invisible insoluble relief pattern. In this process, the blackness and vacuum of the film are the key factors. The darkness ensures that the no-pattern part completely blocks the UV light, and the vacuum degree ensures that the film and the photosensitive resin are closely attached to each other to reduce residual air from generating halation during the exposure process. Affecting the plate-making effect. The main exposure time is determined by the main exposure test.
Therefore, the exposure department is equipped with:
1. The exposing section of the plate making equipment is equipped with UV-A lamps of different sizes and powers. The total light receiving area varies from 70 to 110 mW/cm2, depending on the size of the series and model. In the same exposure unit, the received light must be uniform and the positive and negative deviations should not exceed 3%.
2. With accurate exposure timing device.
3. With vacuum adsorption capacity, it is generally required to generate negative pressure above 0.8 bar. On the one hand, the close combination of the film and the plate is kept, and the halo phenomenon is weakened. On the other hand, the ozone generated during the plate making process is eliminated in time.
4. The sealing conditions are good to avoid the harm to the human body caused by ultraviolet light diarrhea.
From the perspective of use and maintenance:
1. Since the lamp's design life is generally around 600 hours, the light intensity gradually weakens during use, and the exposure time should gradually increase. On the other hand, since the energy release is not stable when the new lamp is used, the lamp is turned on for 15-20 minutes before it begins production.
2. The dust on the surface of the lamp is cleaned with alcohol every two weeks to ensure the luminous efficiency of the lamp.
3. Clean and maintain the vacuum pump every two months to ensure that the vacuum is at 0.8 bar negative pressure.
4. Keep the interior clean and prevent dust from affecting the quality of the printing.
5. Keep the vacuum membrane clean and reject any solvent contact to reduce the life and light transmission of the vacuum membrane.
6. Drawer slides remain lubricated. Due to the long pullout of the slides, heavy pressure is strictly forbidden to damage the slides.
two. The function of the flushing unit is to make the photosensitive resin that does not receive ultraviolet rays and cross-linked during the exposure process. Under the action of the brush on the flushing device, it dissolves in the flushing solvent, and the photosensitive resin that receives the ultraviolet irradiation is retained and formed. Relief.
In the process of rinsing, a high-quality flexographic plate is produced. The automated plate-washing equipment must have the following functions:
1, degree control function. In different areas of the country, the temperature is different, but the solvent (generally n-butanol and tetrachloroethylene with a specific gravity of 1.38-1.42) is generally the best at 20 degrees Celsius, and the flushing quality is the most stable, so the temperature of the equipment solvent tank can be set and Keep the temperature constant.
2. Set the speed of washing plates and control the time of washing plates to suit the flushing of various plates.
3, to automatically adjust the height of the brush to adapt to different thickness of the plate 4, can automatically sense and calculate the length of the plate to automatically control the movement of the brush, the circulation of the circulation of the syrup, the drying of the plate material and other mechanical actions.
5, brush hardness moderate, reasonable arrangement, that is not too soft so that the plate will not be washed clean, not too hard and lose a small dot.
6, can be automatically pre-drying (generally 60 degrees Celsius), plate material out without washing liquid, which is conducive to cleaning.
7. The fresh potion supply function ensures that the base plate of washed plates is clean and the pattern details are clear.
8. The equipment is sealed well and the negative pressure gas is eliminated to ensure a good working environment.
Regarding the flushing department maintenance:
a) Ensure that the temperature controls the amount of refrigerant and ensure the temperature control function.
b) Take care to remove impurities in the solvent by filtration, and prevent the clogging of the transfer line and the solenoid valve.
c) Frequent cleaning of the solidified resin reduces the resistance to movement of various brushes and reduces the extra load on the drag motor.
d) Because the brush is often in contact with solvents, its hardness will gradually increase, as well as affect the quality of the plate wash, so pay attention to changes in its hardness, if necessary, to be replaced.
e) Ensure good lubrication of mechanical moving parts such as brushes and plates.
f) Keep the room clean and clean the exhaust gas blower every two months to ensure the working efficiency.
Third, the drying unit plate material in the washing process, long contact with the solvent, inhaled the solvent to produce expansion, through the hot air drying, the solvent in the plate material volatilized to restore the original size and thickness.
Drying function:
1. With a constant temperature control function, the general drying temperature is set at about 60 degrees Celsius, the temperature is too high for the plate is not good, too low the evaporation rate is too slow is not conducive to work efficiency.
2. With the function of volatile solvent gas discharge, the density of volatile solvent gas in the drying drawer gradually increases during the drying process. If no negative pressure is eliminated, it will block the drying of the plate.
3. The equipment is well sealed and a good working environment is guaranteed.
In terms of equipment maintenance To keep the drawer slide well-lubricated, this drawer has a high temperature, the grease is easy to melt, volatilizes, and the volatilized solvent gas condenses and dissolves, which is not conducive to the lubrication of the drawer slide, and should be lubricated once every two days.
2. When the drawer is pulled out a lot, do not press it heavily to prevent it from damaging the drawer slides.
3. The solvent gas exhaust fan is cleaned every two months to maintain good work efficiency.
four. After the desorption unit plate is dry, the surface is still sticky, so do not touch the surface of other objects, do not touch the surface of the resin by hand, so as to avoid leaving fingerprints. Detackification is the use of 220-260 nm UV light to irradiate the resin plate, so that the surface of the plate to remove the viscosity. Note: Excessive detackification can cause cracking or cracking during use.
This process requires equipment:
1. According to the different models and sizes of equipment, UV-C lamps with different power and quantity have average illumination.
2, the time setting function, in order to accurately control the de-adhesion time.
3, the drawer is good sealing, no UV light leakage.
Corresponding, maintenance:
1. The dust on the surface of the tube is cleaned with alcohol every two weeks to ensure the luminous efficiency of the lamp.
2. The drawer slides are kept lubricated. Because the slide rails are pulled out for a long time, heavy pressure is strictly forbidden to damage the slide rails.
3. Keep the interior clean and prevent dust from affecting the quality of the print.
Fives. The post-exposure exposure is the finishing work of the plate-making. Under the irradiation of UV-A, the photosensitive resin of the printing plate is completely polymerized. This step determines the final hardness of the plate, the imprint resistance, and the resistance to solvents and pressure. Post-exposure is generally performed in the exposure section, and some devices perform de-bonding and post-exposure simultaneously. Save time and improve work efficiency. As shown in the figure below, equipment allocation and maintenance will no longer be split.
The above describes the process of plate making in the flexography, the corresponding functions of the plate making equipment, and the matters needing attention in the maintenance of the use process. We hope to help in the actual production of your plate making.
Foldable Umbrella Co., Ltd. , http://www.straightumbrellas.com