Scraper Operation Techniques and Maintenance Essentials

In the printing process, the scraper plays a crucial role as it directly affects the quality of the printed material. The operation and maintenance of the scraper require careful attention and skill to ensure perfect printing results.

Usage Tips and Precautions for the Scraper

Scraper Usage Tips

• Adjusting Pressure

The pressure of the scraper should be adjusted based on cylinder pressure, blade hardness, and the angle between the scraper and the printing plate. Proper pressure can improve ink transfer rates and reduce wear.

• Maintaining Sharpness

The sharpness of the blade affects the efficiency of ink scraping. A new blade, correct sharpening angle, and appropriate sandpaper model are key to maintaining the blade's sharpness. Proper sharpness can efficiently clean the ink and avoid blade streaks.

• Controlling Contact Distance

The distance between the scraper and the printing plate affects the ink transfer rate and printing quality. Appropriate distance can improve the ink transfer rate while avoiding dirty plates and line marks.

• Ensuring Flatness

The flatness of the blade is vital for printing quality. An uneven blade may cause water droplet marks or intermittent line marks on the edge of the printing surface. Correct installation and cleaning are key to ensuring blade flatness.

• Scraper Movement

The left and right movement of the scraper helps reduce blade streaks and improve usage rates. If the scraper movement is abnormal, it should be adjusted promptly.

Practical Tips to Optimize Scraper Usage Efficiency

• Sharpen the Scraper

New scrapers should be polished with 800-grit sandpaper to ensure the blade surface is smooth and free of nicks.

• Install the Scraper Correctly

Clean the supporting blade and blade holder before installation. Lock it from the center to keep the scraper straight and ensure three-point height consistency.

• Adjusting Scraper Pressure

Adjust the scraper to the appropriate height, gradually increase the pressure, maintain scraper elasticity, and observe printing conditions using a stroboscope.

• Measuring Printing Viscosity

Measure and control the viscosity before printing to prevent blade streaks.

• Other Precautions

Use idle running for surface preparation and uniform polishing; for full-page printing, polish the old blade before use; clean the scraper promptly and store it properly when changing jobs or stopping the machine.

By adhering to these tips and precautions, you can effectively enhance the efficiency of scraper usage, avoid printing quality issues, improve printing quality and production efficiency, thereby increasing overall printing economic benefits.