TB-025 Digital Printing Inks
For digital printing inks, filtration is crucial to ensure print quality and minimize downtime. Different ink types (pigment-based, dye-based, solvent-based, and UV curable) require specific filtration methods to remove contaminants, agglomerates, and oversized pigments, optimizing image quality.
In digital printing systems, ink is crucial for depositing pigment and binding it to the media's surface. To ensure print quality and cost-effectiveness, ink cleanliness through filtration is essential. Different types of inks require specific filtration methods based on their formulations and carrier fluids. Here are the key points:
Pigment-Based Inks:
o Require filters to capture agglomerates and contaminants while passing essential pigments.
o Depth filters between 0.45 and 1 micron are commonly used.
o Hybrid pleated depth media offers improved capacity and flow rates.
Dye-Based Inks:
o Water-soluble dyes use water as a carrier fluid.
o Filtration down to 0.45 micron is typical.
o Membranes like polyethersulfone (PES) are commonly used.
Solvent-Based Inks:
o Still used in the industry for specific advantages.
o Polypropylene media is commonly utilized for chemical compatibility.
o Depth media down to 1 micron is typical for pigment-based inks.
UV Curable Inks:
o Cured and adhered to the media surface by UV photopolymerization.
o No carrier liquid; ink cures instead of drying.
o Depth media is essential for effective removal of gels.
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