Surface Treatment for Paper Cup Machines: Standard vs. Cutting Corners III

April 29, 2026

Continuing from the previous article

Dense anodized film with qualified thickness & sealing, wear-resistant & colorfast.

- Too thin oxide layer, easy to scratch

- Low-quality dye, fades in sunlight

- No sealing, absorbs oil & dirt

Standard quenching/nitriding for gears & rollers, high surface hardness & good toughness.

- Low temperature & short time, low hardness

- Only surface treated, easy to break

- Shallow nitrided layer, short service life

- Ordinary steel instead of alloy steel

Rough → fine → mirror polishing for molds & rollers, smooth for clean cup forming.

- Only rough polishing, rough surface

- Skip mirror finish, easy sticking & burrs

- Unqualified roughness, fast wear