UV gravure ink and reference formula
Gravure printing ink viscosity is very small, usually in the range of 20-300mPa-s, to ensure that the ink has good transfer performance, and get excellent print quality. Gravure printing can be used in a wide range of applications, such as paper, film, aluminum foil, etc., and the printing speed is fast (generally 100-300m/min). Due to the thick ink layer of gravure ink, the content of pigment in the ink is relatively low, generally at 6% to 9%.
UV gravure printing ink is close to UV flexo printing ink in formulation design, low viscosity, fast curing oligomer and active diluent, see section 3.5 UV flexo printing ink in Table 3-38, Table 3-39 and Table 3-4, the selection of photoinitiators can be found in “3.4 UV Offset Printing Ink”.
(1) UV Gravure Ink Reference Formula
Polyester tetraacrylate (EB657) 30.0
Styrene-maleic anhydride copolymer (SMA1440F) 10.0
(EO)4(PET)4A (SR494) 17.0
819 4.9
Blue pigment (LGLP) 5.0
Talc (D2002) 20.1
Brazilian carnauba wax 3.0
Surfactant 4.0
Sulfonated castor oil 2.0
Dibutyl sebacate 3.0
UV stabilizer 1.0
(2) UV red gravure ink reference formula
Hexafunctionality PUA 3
Difunctionality PEA 5
DTMPTA 18
PETA 30
Acrylmorpholine ACMO 10
NPGDA 12
Polymerization inhibitor (510) 0.1
1173 4
369 2.5
Polyethylene wax 1.5
Hydrophobic pyrogenic silica 1
Pigment (Lysol Red) 12
Silicone-free leveling agent 0.4
Silicone-free defoamer 0.5
(3) UV Yellow Gravure Ink Reference Formulation
Hexafunctional PUA 4
Difunctionality PEA 5
DTMPTA 25
PETA 26
Acrylmorpholine ACMO 10
NPGDA 12
Polymerization inhibitor (510) 0.1
1173 4
369 2
Polyethylene wax 1
Hydrophobic fumed silica 1
Pigment (benzidine yellow GR) 9
Silicone-free leveling agent 0.4
Silicone-free defoamer 0.5
(4) UV blue gravure ink reference formula
Hexafunctionality PUA 5
Difunctionality PEA 3
DTMPTA 30
PETA 18
Acryloylmorpholine ACMO 14
NPGDA 8
Polymerization inhibitor (510) 0.1
1173 5
369 3
Polyethylene wax 1
Hydrophobic fumed silica 1
Pigment (phthalocyanine blue BX) 11
Silicone-free leveling agent 0.4
Silicone-free defoamer 0.5
(5) UV Gravure Brightening Oil Reference Formulation
Polyurethane bis acrylate 38.11
Hexylene glycol diacrylate 27.64
Gasil EBC (trade name) 8.59
Benzophenone 2.83
N-methyldiethanolamine 2.83
The above UV gravure varnish formulations are often used for varnishing wood grain paper for furniture, etc.