This document discusses common paper printing problems such as dusting, mottle, delimitation, picking, blanket smashes, wrinkling, and static electricity. It provides causes and solutions for each issue. Causes include insufficient bonding between paper coatings, uneven ink absorption, tacky ink, damaged paper edges, and too dry paper or pressroom conditions. Recommended solutions involve adjusting dampening, inks, press settings, and adding humidification or static elimination equipment. The document encourages contacting their experts for additional troubleshooting help.

1. PAPER PROBLEMS

2. 2
Common Problems
Here’s a list of some common paper-related printing problems such as:
• Dusting,
• Mottle,
• Delimitation,
• Picking,
• Blanket Smashes,
• Wrinkling, Static Electricity.

3. 3
Dusting and mottle Causes
Insufficient bonding between base sheet and coating:
• Uneven ink absorption
• Poor sheet formation
• Plate being run too dry

4. 4
Challenge and Solutions
• Increase dampening
• Try different ink or print on reverse side
• Add more packing
• If there is a spare unit on the press, use it to print blind without water

5. 5
Delimitation and Picking Causes
• If the internal bond of the paper cannot withstand the tack of the ink, the sheet will
delaminate.
• Ink too tacky

6. 6
Challenge and Solutions
• Reduce ink tack
• Replace paper
• Change to less tacky blanket
• Reduce press speed

7. 7
Blanket Smashes Causes
• Scuffs—a roll up on paper, usually originating at the edge of the sheet
• Folded edges
• Splices in cartons or skids

8. 8
Challenge and Solutions
• Prevention
• When loading the press, examine sides of lifts
• Replace blanket

9. 9
Wrinkling and Static Electricity
Causes
• Paper has wavy or tight edges
• Paper has a curl
• Paper too dry
• Pressroom too dry
• Press speed too high

10. 10
Challenge and Solutions
• Adjust feeder and grippers
• Reduce speed
• Change the blanket
• Use humidifier or static eliminator

11. 11
CONTACT US
Rajendra.Prasad@heidelberg.com
www.heidelberg.com

12. 12