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Tips for using scrapers
1. Adjust the pressure: The pressure of the scraper should be adjusted according to the cylinder pressure, the hardness of the blade and the angle between the scraper and the printing plate. Appropriate pressure can improve the ink transfer rate and reduce wear.
2. Maintain sharpness: The sharpness of the blade affects the efficiency of scraping ink. New blades, correct grinding angles and suitable sandpaper models are the key to keeping the blade sharp. Appropriate sharpness can effectively scrape the ink and avoid knife wires.
3. Control the contact distance: The distance between the scraper and the printing plate affects the ink transfer rate and printing quality. The appropriate distance can improve the ink transfer rate while avoiding dirty plates and line marks.
4. Ensure flatness: The flatness of the blade is crucial to printing quality. Uneven blades may cause water droplets or intermittent line marks on the edge of the printing surface. Correct installation and cleaning are the key to ensuring the flatness of the blade.
1. Scraper movement: The left and right movement of the scraper helps to reduce knife wires and improve utilization. If the scraper moves abnormally, it should be adjusted in time.
Practical tips for optimizing the use of scrapers
1. Polishing the scraper: The new scraper should be polished with 800-grit sandpaper to ensure that the blade surface is smooth and without gaps.
2. Correctly install the scraper: Clean the liner and blade before installation, lock from the middle, keep the scraper straight, and ensure that the three points are at the same height.
3. Scraper pressing technique: Adjust the scraper to an appropriate height, gradually increase the pressure, maintain the elasticity of the scraper, and use a strobe light to observe the printing situation.
4. Measure the printing viscosity: Measure and control the viscosity before printing to prevent the appearance of knife lines.
5. Other precautions: Use idling for plate throwing and even grinding; for full-plate printing, grind the old blade before using it; when changing orders or stopping the machine, clean the scraper in time and store it properly.
By following these tips and precautions, the use of scrapers can be effectively improved, printing quality problems can be avoided, printing quality and production efficiency can be improved, thereby improving the overall economic benefits of printing.