Analysis of the cause of the blockage of ink pile and ink
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The ink stack is directly related to the agglomeration of the ink, which can cause gelation of the ink and vitrification of the printed ink film. Increasing the pH or using inexpensive inorganic salts can restore the ink to its original printability, improving fluidity and water washability, as well as reducing the resulting foam or gelation. In this regard, the author analyzes the following main reasons from the above phenomenon.
1. Excessive dispersion.
2. The ink is sucked into the water due to improper storage, resulting in flocculation.
3. The pigment or filler in the ink system is not neutralized by the alkaline binder and neutralized, and chemically reacts and accumulates.
4. Ink and paper are mixed with paper dust or fabric scraps.
5. Misuse of solvent. As some amphoteric solvents or active solvent molecules associate to form a size-sized agglomerate.
6. The ink yield value is too high, the ink head is too short, and the pigment content is too high, especially the filler is not resistant to alkali binders causing it to swell. If it is treated with an acidic solvent, it is reduced to a solid state, and then dissolved again with a solvent.
7. Solvent evaporation gradient imbalance in the ink body. In particular, the ratio of the true solvent to the co-solvent is unbalanced, and the neutralization agent and the neutralizing agent release (exothermic) or volatilize the imbalance.
8. When the addition of ammonia brings in the absorbed carbon dioxide, it blocks the charging of the particles, accelerates the oxidation, promotes the combination of oxygen molecules in the water, and excessive addition also affects the gloss.
9. After the ink is in contact with the air, there is an oxide film mixed into the ink, and the ink may have precipitated particles or short ink and uneven dispersion.
10. Resin monomer composition is small, especially acrylic resin, which disappears when the monomer of acrylic acid increases to 30%.
11. Excessive ink absorption, clumping, and uneven dispersion may result in poor ink transmission.
12. Although the delamination of the ink and the prevention of the precipitation of the ink can be overcome after the addition of the white carbon black, excessive addition causes the ink to flow and the gloss of the printing ink film to be lowered.
13. Pigments or fillers have the same relative density, but the particle cores are not equal in size and are also in a flocculated state.
14. The ink appears to flocculate or gel after the intrusion of acidic substances.