Flexographic printing machines has the advantages of wide adaptability, high printing accuracy, green environment protection and fast mass production speed. It is widely used in label printing, film packaging, paper color printing and electronic adhesive products. In the process of mass production, equipment failures, printing defects, production capacity decline, mainly due to inadequate routine maintenance. Flexographic printing is a precision light pressing process, which requires high equipment cleanliness, component accuracy and operation stability. Standardized daily inspection and maintenance is the key to reduce defects, overprinting errors, equipment jamming failures, improve product yield and prolong equipment service life. This paper describes the key parts and standardized control points of daily maintenance of flexographic printing machines.
1, Ink system maintenance, to ensure uniform and stable ink transfer.
ink path system is the core of ink color, the focus of daily maintenance including roller, ink scraper, ink groove, ink ink pump, and so on. mesh roller as the core of quantitative ink transfer, easy to cause residual dryness and blockage of reticulum. After the daily downtime, must carry on the cleaning in time, prevents ink accumulation and ink skin residue, avoids the production process appears the ink color uneven, the leakage printing, the color difference and so on. At the same time, to check the flatness and wear of the scraper blade every day, to ensure uniform pressure, tight cooperation, prevent ink leakage, splash failure. In addition, the regular cleaning of impurities in the ink tank, check the smoothness of ink pumps and tubes, ensure a steady flow of ink, uninterrupted supply of ink, from the source to avoid the problem of printing color difference.
2. Check the rolling system to avoid printing defects.
The rolling system directly determines the accuracy of printing pressure and graphic forming effect, and is the key module of daily maintenance. Operators need to check the surface condition of the roller and rubber roller every day, clean up the adhesive, dust and ink stains on the surface of the roller in a timely manner, and check the abrasion, inuniformity, aging and deformation of the roller. At the same time, the the parallelism and working pressure of each roller shaft are calibrated to ensure the balance of pressure on both sides, so as to prevent the edges from blurring due to excessive pressure, and the defects caused by insufficient pressure. For the plate roller, to regularly check the concentric and adhesion of the printing plate to ensure that the plate is smooth, bubble-free, loose edges, to avoid printing defects due to poor adhesion of the plate material.
3, Material handling and control system maintenance to prevent overprinting deviation
In the process of high speed printing, the stability of material feeding directly affects the accuracy of overprint. Daily maintenance should focus on checking tension system and correction system, debugging tension parameters, ensuring uniform sealing and smooth operation of material conveying, eliminating problems of material stretching, rocking and deviation. At the same time cleaning the surface of the guide roller to prevent displacement caused by sliding. In addition, daily wiping detection eye and tracking sensors is required to remove dust and ink stains from surfaces, ensure sensitive sensing and accurate positioning, avoid printing inaccuracies and batch defects due to sensor failure, and ensure stability in high-speed mass production.
4. Drying and environment support system maintenance.
drying system maintenance, easy to lead to ink drying, back adhesion, ink blurring and other quality problems. Before and after daily production, the dry air duct and hot air filter should be cleaned regularly to unclog the air duct and ensure smooth hot air circulation and even and stable temperature. According to the speed of production, material type and ink characteristics, reasonably match the drying temperature and wind speed, to prevent printing defects due to insufficient dryness. At the same time control the temperature and humidity of the workshop, to avoid abnormal temperature and humidity resulting in material deformation and ink performance fluctuations, to meet the production requirements of flexible flexographic precision printing.
5. Inspection of transmission Componentss and safety facilities.
The transmission structure of the equipment is the basis of ensuring the stable operation of the whole machine. We should check the lubrication of transmission components such as drive chain, bearing and gear every day, replenish special lubricating oil in time to avoid drying, abnormal noise, blockage and increasing wear. Loosen screws and joints for the fastening equipment equipment and check for vibration and abnormal noise during operation. At the same time, safety facility inspections are carried out to check the integrity of equipment shields and the sensitivity of emergency stop switches, to prevent malfunctions and defective illegal operations of safety protection devices, and to establish a safe production line.
6. INTRODUCTION Abstracts
The core of daily maintenance of flexographic printing machines lies refinement, standardization and standardization. Comprehensive inspection and maintenance of ink path, rolling, feeding, drying and transmission system can effectively solve common problems of blurring, color difference, inaccurate printing and adhesion in printing, greatly improve product production, reduce equipment failure and downtime, reduce maintenance costs and prolong the service life of equipment and accessories. Enterprises shall standardize equipment maintenance system, carry out pre-shift inspection, in-shift inspection and after-shift cleaning and maintenance, ensure stable equipment conditions, and improve printing quality and production efficiency.
