Surface Treatment for Paper Cup Machines: Standard vs. Cutting Corners II
April 29, 2026
Continuing from the previous article
Surface Treatment for Paper Cup Machines: Standard vs. Cutting Corners II
3. Powder Coating
Standard Process
Sandblasting/phosphating pretreatment, electrostatic spraying + high-temperature curing, tough & durable coating.
Common Tricks
- No pretreatment, poor adhesion
- Use recycled/low-grade powder, easy to fade
- Insufficient curing, soft & scratchable coating
- Too thin coating with pinholes, inner rust
4. Painting
Standard Process
Primer + topcoat + baking, strong adhesion & good anti-rust performance.
Common Tricks
- Skip primer, rust penetrates quickly
- Over-diluted paint, poor coverage
- Air-dry instead of baking, low hardness
- Insufficient coats, rough surface
To be continue……
