3. Improving Ink Adhesion on Materials Where Ink Comes Off Easily (Primer Printing)

When performing UV printing on materials resistant to the adhesion of UV ink, apply primer to act as a colorless and transparent base treatment and adhesive agent. This section describes the procedure for printing using primer.

Completed image: Printing on an aluminum lid (primer and CMYK ink)

Materials where primer usage is recommended

• Glass
• Enamel
• Cast plate (cast acrylic)
• Tile
• Metal (stainless steel, aluminum) * Primer has no effect when used on copper or brass.

The primer may not be fully efficient on some materials.

IMPORTANT: To avoid nozzle clogging due to ink hardening close to the print head surface, do not use primer on mirror surfaces and other such items that easily reflect light from a UV lamp.

MEMO:

• Degreasing the printed surface before printing is effective to improve ink adhesion.
• To prevent the ink adhesion from being affected by oil, sweat, etc. on your hands, do not touch the printed surface with bare hands.