How to do a good job in the maintenance of flexogr

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How to do a good job in the maintenance of flexographic press

flexographic press, which integrates many advantages, is active in the field of printing and packaging in China. It is often said that "sharpening the knife does not mistake cutting firewood". In the same way, it is impossible for a flexographic machine to be convenient to use and print exquisite products without careful and in place maintenance. Well maintained flexographic printing equipment can maintain good accuracy and working state, which is closely related to ensuring safe production and improving the output and quality of prints

the maintenance of flexographic press can be divided into four levels: daily maintenance, weekly maintenance, monthly maintenance and annual maintenance

I. daily maintenance

daily maintenance is the maintenance done in the daily production process. It is generally carried out when the shift is changed every day or when the machine is stopped to change paper

1. The dust and dry ink on the surface of the machine should be wiped clean.

during the production process of the flexographic press, the ink will inevitably be thrown out of the ink tank with the high-speed rotation of the corrugated roller and stick to the support frame above the printing plate. If you do not wipe it for a long time, the ink spots will fall off onto the printing plate after drying, which may cause damage to the printing plate or dirty spots on the printing products

frequent movement of personnel in the production workshop will inevitably cause dust to adhere to all parts of the machine, and too much dust will accumulate at the visual eye, which may cause detection failure and unnecessary shutdown of the machine; Too much dust on the surface of the rectifying diode can cause it to fail to correct the deviation normally, causing the paper to swing back and forth, resulting in inaccurate axial overprint of the rear color deck

2. Clean up the dry ink at both ends of the wrinkle roller

in the process of ink transfer with high-speed rotation in the groove, which has been used in satellites, aerospace and energy storage, it is inevitable that the ink dries and adheres to both ends of the wrinkle roller. If it is not cleaned in time, it will accumulate more and more, and when it reaches a certain degree, the phenomenon of ink rejection will occur, resulting in dirty spots on the printed matter

3. Clean the plate gear and imprint the dry ink between the gears

if the ink thrown out from both sides of the wrinkle roller is dry and fixed between the gears, it is easy to cause the gears to not mesh normally, and the vibration and pressure become smaller, thus affecting the print quality

II. Weekly maintenance

refers to the maintenance of the machine after a batch of products are printed for half a day every week

1. Thoroughly clean the corrugation roller

the corrugation roller can be automatically switched between the control rings, which is the heart of the flexographic press. After a batch of products are printed, they need to change orders. Different products have different color sequences, and the number of lines of the embossing roller is also different. Some of these corrugated rollers may not be used next time. If it is not cleaned for a long time, the following conditions may be caused: - the hole is blocked by dry ink. After simple cleaning, there is still some dry ink on the roller. If it is not cleaned by the machine, the dry ink will deposit in the hole, thus changing the ink transfer amount of the roller, causing the next printing to be lighter or pasted—— Orders for flexographic products are generally short production cycle and urgent demand. If you don't rush to clean the wrinkle roll after receiving the order or clean it after you find that the hue is too light after you get on the machine, it will delay production and even cause delayed delivery

2. Clean up the dirt in the slideway, add lubricating oil

the debugging of the embossing roller and the printing plate pressure of flexo printing machine is realized by rotating the handle to change the position of the slider in the slideway. If there is dry ink, dust and dirt in the slideway, it will hinder the smooth sliding of the slider in the slideway, and the accurate adjustment of printing pressure cannot be achieved. After cleaning the dirt in the slide every time, add lubricating oil at the same time to ensure that the slide block can slide back and forth freely

3. Thoroughly clean the whole machine

the electric cabinet of the flexographic press is the location of various control components. Too much dust and paper foam will affect the sensitivity of control components, and will also cause frequent fuse breakage, resulting in unnecessary shutdown in the production process

III. monthly maintenance

monthly maintenance refers to taking out one day to maintain the machine even when the production task is busy. In addition to all the contents of weekly insurance, it should also include the following parts

1. Check whether the performance of the air support roller is good.

if the leather bag in the air support roller is aged, broken or not tightly sealed, in the process of high-speed production, the air support roller will not reach the due diameter after the paper is loaded and inflated, which will cause the paper to move to a certain end on the air support roller, resulting in inaccurate overprint or paper discount in the printing area

2. Check whether the embossing cylinder is scratched

the embossing cylinder whose surface is not chrome plated is easy to be scratched. If the scratch is not treated effectively, it will cause spots moving back and forth on the printed matter, which will affect the quality of the printed matter. If there is a very shallow and short scratch, you can use fine sandpaper to gently Polish its surface to eliminate its impact on the printing quality; If there is a deep and long scratch, ask a professional to repair it

3. Check whether the cylinder movement is normal

whether the cylinder movement is normal or not is directly related to the debugging of printing pressure. During normal printing, the air cylinders at both ends are inflated at the same time, causing the extension of the supporting rod, which drives the embossing roller and the printing plate to realize the press and ink transfer. If the cylinder at both ends of the embossing roller or the printing plate has different extension lengths under the same air pressure, it will cause great printing defects: Line paste plate, and ink bars appear on the ground

4. Fill each grease hole with grease

the main motor of the printing machine will make a dull sound in the absence of lubricating oil, accelerating the wear of its internal bearings; In the case of lack of lubricating oil, each motor of the fan will make a sharp sound, affect the blowing effect, and even cause the fan overload fault. The filling standard is: inject new oil and completely drain the waste oil

IV. annual maintenance

annual maintenance is the largest and most thorough maintenance, once a year. In addition to the above three kinds of maintenance, it should also include the following contents

1. Thoroughly clean the cooling effect of the tool holder (3) and the ink tank

add enough detergent into a large tank, mix it with water to a certain proportion, put the knife rest and ink tank into it, soak it for one day, and then remove the dry ink and dirt on it with an ink splitting shovel

2. Remove the clutch pressure structure of the roller and the corrugated roller, put it in the gasoline after disassembly, thoroughly clean the waste wholesale 10000 ordinary plastic bags that meet the standard with a brush, order oil and iron filings, check whether they are worn, and replace the worn parts

3. Check the clearance between the bearing and the bearing inside the gearbox caused by the long-term high-speed operation of the gear box of each color group under the printing pressure, and replace the bearing if necessary. Check the lubricating oil level inside the gearbox, and add lubricating oil or replace lubricating oil in time

systematic and orderly maintenance of the equipment, timely identification and elimination of potential hidden dangers, can restore the accuracy of the equipment and keep the equipment in good running condition. This not only improves the product quality, reduces the consumption of raw materials, but also saves the repair cost, which can be said to kill many birds with one stone. (end)

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