There are many factors that affect the quality of the final product in flexographic printing. Printing ink, pressure, anilox roller, paper and other factors are very important to us, but the flexographic plate-making environment is often ignored. Everyone put the pre-quality control on pre-press production, thus ignoring the importance of the platemaking environment. In fact, many printing problems are caused by the lack of proper control in the early plate-making environment, and they often spend time on the adjustment during printing, but the results are minimal. We have encountered such customers, reflecting that the printing effect is not good, all the small characters are pasted, and the negative characters are also blocked by the ink. I thought it was caused by too much pressure. How to adjust the results did not improve, it took a lot of time and was delayed On-time delivery of products. After investigation, we found that some corporate plates were stored in the window without shading. Some plates were placed on the window sill to see the light. The ultraviolet rays in the sunlight produced a polymerization reaction on the plate resin, which affected The small prints were imaged, and the phenomenon that the printed plate was not deep and slurred appeared, which eventually led to poor printing. There are many problems like this, almost caused by the plate-making environment. So what are the environmental factors that affect the quality of flexographic printing plates? 1. Equipped with ventilation facilities ⑴ Exposure, drying and rinsing of the printing plate during plate making will release tail gas or volatilize the solvent gas of the plate washing. Maintaining ventilation in the plate-making room is very important for air quality. The workshop should be fully ventilated and the air in the workshop should be continuously updated. 2. UV protection Since most of the flexographic printing plates are made of photosensitive materials, which are sensitive to ultraviolet rays, UV protection equipment should be provided in the workshop. (1) The used lighting fixtures must not leak ultraviolet rays. The plate-making machine is equipped with yellow safety lights for this reason. 3. Dustproof During the printing process, dust is a big killer, especially the screen version and LCD version. A small piece of dust may cause the dots to be lost or incomplete. Therefore, filtering dust is also very important. 4. Equipped with air conditioning to control temperature and humidity Due to changes in weather, temperature and humidity vary greatly throughout the year. What temperature and humidity are most suitable for normal operation of plate-making equipment? That is room temperature 24 ℃, humidity is about 50% to 60%. ⑴ Help to stabilize the operator's emotions; 5. Electrical safety equipment The electrical equipment is configured according to the requirements of equipment, lighting, and exhaust. The main switch is set and the overload protection switch is set to avoid fire caused by equipment overload or short circuit. 6. Equipped with pool Solvent spilled on the ground or outside the equipment should be cleaned immediately. The brush and brush roller can be cleaned with clean water. If you are a little careless when making a plate, if the potion splashes into your eyes, you should immediately rinse with water. 7. Equipped with storage room To be equipped with a storage room that can store plates and films, not only can extend its service life, but also easy to manage and access. The storage room shall store the plate materials, and the stacking shall not be higher than 12 boxes, the bottom surface shall be flat, and the small boxes shall be stacked separately from the large boxes. The storage room should be far away from the heat source and ventilation holes, and the room temperature should be controlled between 4 ° C and 28 ° C, with 20 ° C being the best. Humidity should not be too high. Avoid direct sunlight and install safety lights. 8. Plan the space according to the technological process and the size of the equipment When making a plate, from exposure to post-processing, the plates are moved around, and there is not enough space to affect the work efficiency. The inline equipment is placed according to the main exposure-back exposure-washing-drying post-processing process, which reduces the number of plate movements and reduces the possibility of plate injuries. There must be a safe passage between the equipment placement room, equipment and the wall to facilitate adjustment, maintenance and repair.
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⑵ The equipment itself must be equipped with exhaust fans and pipes to extend the end of the pipes out of the workshop. How to control the exhaust gas not to leak into the workshop and be smoothly discharged, it is necessary to control the air pressure difference between the inside and the outside of the equipment, so that the air pressure outside the equipment is greater than its internal pressure, and air flows in. It is required that the amount of air discharged from the workshop is slightly smaller than the amount of air supplied to the workshop.
(3) Since the density of the exhaust gas is greater than that of the fresh air, the exhaust vent is required to be as low as possible, and the lower it is from the ground, the better.
⑵ There is a lot of ultraviolet light in the sun, especially in areas with high altitude, it should be noted that the sunlight from the workshop window should be blocked, and anti-ultraviolet curtains should be installed. [next]
â‘´ Minimize personnel entry and exit in the workplace, and staff wear anti-static overalls. The storage room of the plate material and the exposure machine should be separated, and the finished printing plate is passed out through the isolation window to reduce the number of entrances and exits.
⑵ The air injected into the workplace must be strictly filtered. This must be transformed by a professional air purification company.
⑵Keep the activity of solvent washing, control the volatility of volatile solvents;
⑶Conducive to the normal operation of equipment and appliances;
â‘·It is beneficial to unify the expansion and contraction of film and plate materials and control the accuracy of overprinting.
Since the flexo plate processing solvent is a flammable substance, it is necessary to equip the workplace with fireproof equipment. Fire-fighting equipment mainly uses dry powder fire extinguisher, CO2 fire extinguisher, or water spray. [next]