One. Check before starting
1. Do not pile tools around the machine, especially at the pyrogen drying device of the UV. Never place items with flammable solvents at random. The surrounding area should be clean and tidy.
2. Before starting the machine, check whether the oil level in the fuel tank is enough. If it is not in place, add it in time.
3. Turn on the power and check whether the lubrication system is working properly.
4. Check whether all safety protection devices are complete and reliable.
two. Cleanup at the end of work
1. Wash the roller shoulder iron every day to avoid the accumulation of residual ink and affect the normal pressure, causing premature aging of the machine.
2. Every day after work, the surface of the impression cylinder should be cleaned, and the glue stick and water stick should be cleaned to keep the appearance of the equipment clean and the surrounding environment clean.
3. When there is no one to take over from work, you must do a good job of handing over the shift. In principle, you need to be handed over orally, and explain the current status of the equipment clearly. The precautions of unfinished printed products are clearly explained. Clearly caused the error to occur.
three. Some adjustment items of printing machine
1. Feida adjustment: The mouthpiece is generally 6 to 10 mm from the edge of the paper stack. The amount of air blowing should be changed according to the weight of the paper. It is best to blow about 10 to 13 sheets on the surface, and 2 to 3 sheets on the surface can be easily sucked up. The height of the paper separation nozzle is 6 ~ 8mm away from the stack, the thick paper should be about 3mm lower, the height of the paper feed nozzle is 5 ~ 8mm away from the stack, the pressure foot extends into the stack edge is 10 ~ 15mm, subject to not stepping on the previous sheet.
2. Adjustment of the front gauge: both sides of the front gauge should be adjusted on the same straight line, and all the front gauge calibrations are automatically calibrated when the paper size is entered.
3. Adjustment of the side gauge (pull gauge): The height of the pressure plate is adjusted based on the thickness of the printing paper, the point is 320 degrees, and the 5mm width paper strip is just inserted, and it can be freely twitched. Thin springs for papers under 80 g and thick springs for papers over 80 g.
4. Adjustment of water stick and ink stick: first adjust the pressure of the water transfer stick and the water stick, and measure it with a 10-wire steel sheet, then adjust the pressure of the water stick and the printing plate. The method is the same as above. The pressure adjustment method of the ink stick is the same as the water stick. After the ink is applied, the pressure between the ink sticks is measured by detecting the ink lines of the rubber stick and the iron stick. The width of the ink line is preferably 3 ~ 4mm. The ink line width of the printing plate measures the pressure between the ink stick and the printing plate.
four. Preparation before printing
1. First of all, we must carefully check whether the worksheet is consistent with the proof sheet, paper type, weight, quantity, color number, specifications, and size, and enter the correct paper size and thickness on the touch screen. Before inputting, make sure that the feeder of Feida feeder and the front pressure plate are removed, whether the receiving paperboard is at the lowest position, and whether the auxiliary paperboard is closed or pulled out.
2. Prepare the proofing paper used to adjust the printing plate and clamp the proofing paper, and clip two sheets of white paper every 25-30 sheets of blotting paper, separated by five layers, depending on the special circumstances. In order to achieve the best printing effect, there should be at least two ink running processes before printing. Each run of ink requires more than 100 sheets.
3. It is forbidden to install rubber blankets on the ground. It is easy to stick sand and other debris and cause internal injuries of the rubber blanket. It should be operated with paper or wooden board to ensure the neatness of the back of the blanket. Two people should install it at the time of installation. At any time, observe whether the two sides of the rubber are parallel and whether the pad paper is displaced. The locking force should be appropriate. Overtightening will affect the life of the rubber and the printing durability of the printing plate. If it is too loose, it will easily cause ghosting.
Fives. Water control
1. The temperature of the fountain solution can be determined according to the indoor temperature, generally 10 degrees Celsius is preferred, the alcohol concentration is preferably 12 percent, and the conductivity range is controlled between 700 and 1200.
2. The moisture content of the layout is observed at a 45-degree angle, and the layout is slightly shiny. Too bright proves that the moisture is too large, the ink is easy to emulsify, and it is not easy to dry. At the same time, it will increase the stretch rate of the paper. Matte proves that the moisture is too small and it is easy to paste.
six. Quality control of products in printing
1. First check whether the printing plates, papers, proofs, etc. are consistent, as well as the size of the printing plate, whether the overprint is accurate, check the dot definition, whether the dots are deformed, the fine dots are not false, the coarse dots are not blurred, the color meets the requirements of the proofs, the positive and negative versions are calibrated correctly .
2. The ink color is uniform and thick, bright color, complete tone, full layer, the front and back colors are consistent, no flower, no hair, no bottom.
3. Sampling frequently, to check the printing effect and various printing indexes at any time, sampling should be 100-200 sheets for random inspection.
Seven. Safe Production
1. In order to prevent and avoid injury to the machine and personnel, the operator should understand the safety devices of each part of the machine, and check the machine before operation. The safety devices and protective facilities on the machine are not allowed to be dismantled, and non-electricians should not repair electrical appliances to prevent equipment and life safety.
2. When publishing the version and the blanket, keep a high concentration of thoughts, and the two should have a certain tacit understanding. When adjusting the machine, the machine should be locked in time to avoid unnecessary accidents caused by misuse of other personnel.
3. When cleaning the eraser and the printing plate, pay attention to the rag-handling posture, the amount of gasoline or car water should be moderate, and it must not be dropped into the lower seat roller, or the teeth of the roller will be rusted, especially when UV printing. Serious consequences of fire.
4. Combustible products such as gasoline, car wash water, and rags are not allowed to be placed between and on each side of the unit. After cleaning the unit, the above items must be placed in a designated place in time. The empty ink tanks on both sides of the unit should be cleaned at any time and the machine should be kept at all times. Hygiene, remove hidden dangers.
5. When removing the fluff and paper fleece from the printing plate, the ink scraping device should be used. If it is not used, it must be shut down for operation. Never operate in violation of the rules when the power is turned on.
6. Do not wear slippers to work in the workshop, even more do not climb on the machine to operate, do not allow tools to be placed in the coat pocket, and pay attention to that your clothing corner is not brought to the transmission part. Do not place all kinds of debris on the stack of paper, on the sample stand, or on the cardboard. The oil on the machine should be cleaned in time to prevent it from being injured by slipping when walking.
7. You should always pay attention to the operation status of the machine, eliminate hidden dangers in time, and handle the accident in the bud. It is found that the broken paper is skewed, angled, or grabbed by the gripper during printing. Do not grab it by hand to avoid accidents. When operating the machine, you must concentrate on your thoughts, do not allow giggles in the workshop, or read some books and magazines without related production, and do not allow you to use mobile phones or send text messages during work hours.
8. Do not eat in the workshop, or eat hard-skinned, hard-seed melon and fruit foods in the workshop to prevent the residue of rice grains from turning into the paper, puncturing the rubber or damaging the printing plate.
9. When the machine equipment is faulty or damaged, it should be kept on site and immediately reported to the relevant department. After the analysis and analysis of the nature of the accident or the agreement, it can be disassembled. (Except for special cases of life accidents)
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Huayao Master (Puyang) Automation Equipment Co., Ltd. , https://www.huayaomaster.com