Uv Flexographic Paper Ink
UV Flexographic Paper Ink is a flexographic printing ink based on ultraviolet curing technology, specially designed for paper substrates (such as packaging boxes, labels, paper bags, etc.). Its core feature is that the photopolymerization reaction is triggered by UV photoinitiator to achieve instant curing of the ink.
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Product Introduction
Prepolymers and monomers (accounting for 60-80%): provide film-forming properties and adhesion, commonly used epoxy acrylates, polyurethane acrylates, etc.
Photoinitiator (3-8%): generates active free radicals after absorbing UV light energy, initiating cross-linking and curing.
Pigments (10-30%): determine color performance, high dispersibility is required to ensure printing clarity.
Additives: including leveling agents, defoamers, etc., to optimize printing suitability.
Efficient curing
The curing speed reaches 100-300 m/min, without the need for traditional drying equipment, significantly improving production efficiency.
Fujifilm 300 series ink supports dual curing with traditional UV lamps and LED light sources, with stronger compatibility.
Excellent printing quality
Precise dot reproduction (up to 1%-98%), sharp edges, suitable for fine graphic printing.
Low viscosity (700-900 cP) ensures uniform ink layer during high-speed printing.
| Feature | Traditional Screen Printing | UV Curing Screen Printing |
|---|---|---|
| Curing Time | Hours to days | 1-5 seconds |
| Environmental Impact | High VOC emissions | Zero VOC, eco-friendly |
| Adhesion | Requires primers or surface treatment | Direct adhesion on low-energy surfaces |
| Production Efficiency | Multi-step drying process | Single-step, inline curing |
| Longevity | Fades or cracks over time | Resists weathering for 5+ years |
FAQ:
1.What is the core difference between flexographic ink and traditional solvent-based ink?
Printing performance and ink layer characteristics
Gloss: After curing, the gloss of UV ink can reach 80-120GU (60° angle), while solvent-based ink is usually 40-70GU, requiring additional glazing process.
Abrasion resistance: UV ink forms a dense film layer through cross-linking structure. The number of cycles of Taber abrasion test (CS-17 wheel, 1000g load) is > 2000 times, while solvent-based ink is only 500-800 times.
Chemical resistance: The UV ink layer is significantly better than solvent-based ink in tolerance to alcohol and grease. For example, in the 75% ethanol wiping test, UV ink can withstand 500 times without fading, while solvent-based ink is only 100 times.
Equipment and process compatibility
Drying system: UV process requires a UV curing unit (such as a gallium lamp or LED array), and the equipment investment is about 1.5 times that of a traditional IR oven, but the floor space is reduced by 60%.
Plate compatibility: UV inks require a dedicated photosensitive resin plate (such as DuPont Cyrel FAST) with a hardness of 75-85 Shore A, while solvent-based inks are suitable for traditional rubber plates (Shore A 60-70).
Maintenance cost: The UV system requires regular replacement of the photoinitiator filter (every 2000 hours), while the solvent-based process requires daily cleaning of the ink path to prevent skinning.
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