Scum

In printing, "scum" refers to unwanted ink or residue that appears on a printed surface, often as a result of improper ink distribution or an issue with the printing press. It typically shows up as dark spots, streaks, or blemishes on the final printed material.

Synonym

Ink blemish

Examples

• Spotting: You may notice scum if certain areas of a printed page have dark, uneven spots where the ink has not adhered properly.
• Streaking: Scum can also appear as streaks or lines on printed materials, indicating issues with ink flow or press settings.

Recommendations

• Preventive Measures: Regularly clean the printing press and ensure that ink rollers and plates are properly maintained to minimize the risk of scum. Use high-quality ink and check for proper ink consistency.
• Troubleshooting: If scum appears, adjust the ink flow and press settings. Ensure that the paper or substrate is compatible with the ink and press. Testing different paper types and adjusting the press temperature can also help reduce scum.

Addressing scum early can save time and resources, ensuring a cleaner and more professional print output. Regular maintenance and careful monitoring of your printing process are key to achieving optimal results. To learn more, contact AP&B today.