UV Ink For Flexo Printing
UV Ink for Flexo Printing is a high-reactivity UV-curable ink designed for high-speed flexographic printing systems used in packaging, labeling, and film conversion industries. It cures instantly under UV/LED UV exposure, forming a dense cross-linked polymer layer with strong adhesion, abrasion resistance, and chemical stability.
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Product Introduction
Composition and Formulation Structure
Key Technical Performance
UV flexographic ink systems are engineered for stable industrial operation under high-speed printing conditions:
Viscosity range: 200 – 1500 mPa·s (adjustable based on anilox volume)
Curing speed: ≤ 0.1–0.5 seconds under medium-pressure mercury lamp (80–120 W/cm)
Film thickness: 1.0 – 3.5 μm (dependent on substrate and anilox cell volume)
Adhesion strength: ≥ 4B on treated PET / BOPP films (cross-hatch test)
Surface hardness: 2H – 4H pencil hardness after full cure
Heat resistance: up to 120°C without discoloration or ink migration
Rub resistance: > 500 cycles (Sutherland rub tester, 200g load)
Printing Process Compatibility
UV Ink for Flexo Printing is compatible with:
Central impression flexo press (CI flexo)
Narrow web flexo printing machines
Hybrid flexo + digital printing systems
Recommended process parameters:
Anilox roller volume: 3.0 – 8.0 BCM (depending on image density)
UV lamp intensity: 80–160 W/cm
Line speed: up to 300 m/min (industrial optimized systems)
Application Scenarios
Customization Options
FAQ:
What anilox roller specification is recommended for UV flexo ink printing?
The anilox selection depends on ink coverage and resolution requirements.
Fine text / barcode printing: 200–400 LPI, 2.0–3.5 BCM
Standard packaging graphics: 300–500 LPI, 3.5–6.0 BCM
High ink coverage areas: 400–600 LPI, 6.0–8.0 BCM
Incorrect anilox volume can lead to ink flooding, poor curing, or color inconsistency.
Why does UV flexo ink sometimes have adhesion failure on film substrates?
Adhesion failure is typically related to surface energy and curing efficiency:
Substrate surface tension below 38 dynes/cm (insufficient corona treatment)
Under-curing due to low UV intensity or lamp aging
Excessive ink film thickness causing incomplete polymerization
For stable adhesion, substrate treatment + correct UV dose must be controlled simultaneously.
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