UV Letterpress Inks and Reference Formulas
Since letterpress printing is not as good as offset printing and flexographic printing, and the printing speed is not as good as offset printing and flexographic printing, it is being used less and less, and therefore the production of letterpress inks is also decreasing.
For UV letterpress ink, please refer to “3.5UV Flexographic Ink”.
(1) UV Letterpress Ink Reference Formulation
EA 35
GPTA 20
TPGDA 13
BP 6
TEA 3
Pigment 17
Filler 5
Polyethylene wax 1
(2) UV Red Letterpress Marking Ink Reference Formulation
PEA 54
DDA 10
TMPTA 8
BP 3
ITX 3
EDAB 5
Riso Red Pigment 16
Wax 1
(3) UV black letterpress ink reference formula
EA 15
PEA 22
Chlorinated PE 30
GPTA 5
ITX 2
369 4
ODAB 4
Carbon black 16
Polyethylene wax 2
(4) UV White Letterpress Ink Reference Formulation
EA 25
HDDA 10
TPGDA 19
TPO 2
184 3
TiO2 24
Talc 15
SiO2 2
(5) UV letterpress ink reference formula
Epoxy bisacrylate 18
Conditioning resin 15
Active monomer 30
Benzophenone 8
Triethanolamine 3
Pigment 22
Polyethylene wax 2
Bentonite 2
How formulators usually evaluate this photoinitiator topic
When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.
- Match the package to the lamp first: mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.
- Check depth cure and surface cure separately: a film that feels dry on top can still be weak underneath.
- Balance yellowing with reactivity: the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.
- Use the final formula as the benchmark: pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.
Recommended product references
- CHLUMINIT 819: Useful when a formulation needs stronger absorption and deeper cure support.
- CHLUMINIT 184: A classic free-radical benchmark for fast surface cure in many UV systems.
- CHLUMINIT 1173: A practical comparison point for classic short-wave UV initiation.
- CHLUMINIT ITX: A useful long-wave support route in many printing-ink packages.
FAQ for buyers and formulators
Why are blended photoinitiator packages so common?
Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.
Should incomplete cure always be solved by adding more initiator?
Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.
Contact Us Now!
Quick answer: In most UV systems, photoinitiators are selected by balancing wavelength fit, through-cure, color control, and line speed. Buyers usually compare a blended package instead of one isolated product.
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