What's the right photoinitiator package for UV inks?

For mercury arc UV, TPO + Irgacure 184 in roughly a 1:1 ratio at 4–8% total covers most pigmented inks. For LED-UV (385–405 nm), shift the package toward TPO-L or BAPO (Irgacure 819) which absorb deeper into visible. White inks need extra surface-cure (TPO-L) to overcome opacity-driven UV blocking.

Why does my waterborne ink film fail rub resistance on BOPP?

Two common causes: (1) inadequate substrate surface energy — BOPP needs corona treatment ≥38 dyne/cm; (2) insufficient slip additive package — add wax emulsion (PE or carnauba) at 1–2% on dry binder, plus a polyether-modified silicone for instantaneous COF reduction. Verify with crock test post-cure.

How do I match a competitor's flexo ink color?

Share the Pantone target plus the intended substrate. We'll suggest a pigment combination (ratio of process colors plus any specialty grade like quinacridone violet PV19 or benzimidazolone yellow PY151) with starting let-down and dispersion conditions. Standard color match within ΔE < 1.5 in 1–2 trial iterations.

Do you supply solvent retention and bleed compliance documentation?

Yes — for food-contact packaging, we supply Swiss Ordinance (RS 817.023.21) and Nestlé negative-list documentation on request. EU 10/2011 declaration of compliance for plastic-contact applications. PI grades for direct-contact food are flagged in the catalog.

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Tintas de Impressão

Q: Which resins are used in solventborne flexographic inks?

Nitrocellulose (NC, RS quarter-second or half-second grades) is the dominant binder for solvent flexo on film and foil — fast solvent release, excellent transfer. Polyamide resins (low-MW soft grades) co-blend with NC to improve film flexibility and adhesion to BOPP. Acrylic-modified resins are used for retort or low-odor systems.

Q: Do you supply solvent retention and bleed compliance documentation?

Yes — for food-contact packaging, we supply Swiss Ordinance (RS 817.023.21) and Nestlé negative-list documentation on request. EU 10/2011 declaration of compliance for plastic-contact applications. PI grades for direct-contact food are flagged in the catalog.

Pigments, resins, and additives for flexographic, gravure, offset, UV-curable, waterborne and screen printing inks across packaging, publication and industrial substrates.

Printing ink chemistry differs sharply from general coatings: ink films are thin (typically 1–8 microns dry), substrates range from absorbent paper to non-absorbent films, and process speeds in modern flexo and gravure presses leave milliseconds for each ink station to set or cure. The result is a tightly constrained formulation space where pigment dispersion quality, resin compatibility, and rheology under high shear are decisive.

Coatingsink supplies the full ink raw-materials portfolio: organic and inorganic pigments matched for solvent or waterborne dispersion, NC and acrylic resins for solvent flexo, hybrid ester systems for gravure, polyester acrylates for UV, and the wax / slip / surfactant additives that fine-tune transfer and rub resistance. Whether you formulate flexible packaging inks, narrow-web label inks, news offset, or UV inkjet, our products are matched to specific press conditions and substrate sets.

How to Choose Tintas de Impressão

Key selection criteria buyers use when specifying tintas de impressão for trade and OEM formulations

Substrate Compatibility

Paper / corrugated tolerates a wide formulation window — water-based or solvent. Non-absorbent films (BOPP, PET, PE) need surface-energy-matched binder systems and adhesion promoters. Aluminum foil and metallized films need primer compatibility and heat-seal resistance.

Pigment & Dispersion

DPP red, quinacridone, phthalo blue/green, and benzimidazolone yellows give the lightfastness and color strength packaging inks need. Ensure pigment grade matches the binder polarity — solvent-borne dispersions don't translate to waterborne without re-dispersing.

Cure & Setting Speed

Solvent flexo at 300+ m/min needs binders with rapid solvent release (NC, low-MW polyamide). UV inks need fast-curing photoinitiators (TPO, 184) tuned to LED or mercury lamp output. Heatset offset uses oxidative-drying alkyd-modified resins.

Adhesion & Mechanical

Match resin acid value and Tg to substrate flexibility. Add silicone slip additives where coefficient-of-friction targets are tight. PE wax for rub resistance, PTFE micropowder for premium scuff resistance on retail packaging.