In the process of packaging and printing, the ink stack is directly related to the agglomeration of the ink, which can cause the gelation of the ink and the vitrification of the printing ink film. Appropriately increasing the pH value or using inexpensive inorganic salts can restore the original printability of ink, which can not only improve fluidity and washability, but also reduce foaming or gelling. In this regard, the following main reasons are analyzed from the above phenomenon.
1. Excessive dispersion.
2. Due to improper storage, the ink will absorb moisture and cause flocculation.
3. The pigments or fillers in the ink system are not resistant to alkaline binders and are neutralized, and chemical reactions occur and accumulate.
4. Paper scraps or fabric scraps are mixed into the ink.
5. Misuse of solvent. For example, some amphoteric solvents or active solvent molecules associate to form aggregates of size.
6. The yield value of the ink is too high, the ink filament head is too short, and the pigment content is too high, especially the filler is not resistant to alkaline binders, causing it to expand. For example, it is reduced to a solid state after the action of an acidic solvent, and then redissolved with a solvent.
7. The solvent volatilization gradient in the ink body is unbalanced. In particular, wax manufacturers usa, the ratio of true solvent to co-solvent is unbalanced, and the release (exothermic) or volatilization of neutralizer and co-neutralizer is unbalanced.
8. When ammonia is added into the absorbing carbon dioxide, it prevents the charging of each particle, accelerates oxidation, and promotes the merger of oxygen molecules in water. At the same time, excessive addition will also affect the gloss.
9. After the ink is in contact with the air, the oxide film is mixed into the ink material, and the ink may have precipitated particles or short ink properties and uneven dispersion.
10. The resin monomer composition is small, especially the acrylic resin, when the acrylic monomer increases to 30%, it will disappear.
11. Excessive ink absorption, clumping and uneven dispersion will cause poor ink transfer.
12. Although the addition of white carbon black can overcome the stratification of the ink and prevent the precipitation of the ink, but adding too much will cause the ink to not flow and the gloss of the printing ink film to decrease.
13. Although the relative density of pigments or fillers is the same, but the particle size is not equal, they will also be in a state of flocculation.
14. The ink flocculates or gels after the intrusion of acidic substances.
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