Failure analysis: Flexible ink delivery for flexible packaging plants, the real murderer is here
The pigment particles are evenly dispersed in the binder. Since the pigment and the binder are in polar contact, a charged surface layer is produced. After a period of rest, they will attract each other and become a flocculated state. The ink becomes thicker and the viscosity becomes larger. However, when an external force acts (such as stirring), the flocculation state is quickly destroyed, the ink becomes thinner, and the viscosity becomes smaller. The industry calls this property the thixotropy of ink. The thixotropy is too strong, which makes the ink difficult to rotate in the ink fountain, and makes the ink delivery difficult.
(1) Surface properties of all pigments
The carbon black of the same type undergoes surface oxidation treatment with ozone, and the thixotropy of the prepared ink is much smaller than that of the untreated one.
(2) Pigment dosage
If the pigment content in the ink exceeds a certain level, it becomes a plastic fluid with poor fluidity and large thixotropy. If the pigment content in the ink is small, the thixotropy is small, but it may not reach the desired color density. Therefore, color density and thixotropy are contradictory, and only a balance can be found between the two.
(3) Pigment wettability
Pigments with poor wettability have high thixotropy.
(4) Particle shape of pigment
If the pigment particles in the ink are needle-shaped and plate-shaped, the thixotropy is larger than spherical.
(5) Molecular weight of resin
The molecular weight is large, but the n-heptane value is small. The ink has a large thixotropy. The thixotropy of inks made with high molecular polymers is greater than that of inks made with vegetable oils.
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