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Phenomenon: Almost similar to acidification, but not because of the absorption of moisture in the ink system caused by delamination, precipitation and precipitation, mostly because one or more resins in the ink system are not completely miscible during blending, or One type does not reach dissolution (such as turbidity) at all. In the printing process of packaging printing inks, the use of a single solvent or the use of a wrong solvent can also lead to inconsistent floating color, light color and ink film wrapping.
Reasons: 1 is the ink has expired; 2 is because the pigment formed a large flocculation and the precipitation occurred; 3 is the ink itself is relatively thick, the viscosity is not high viscosity and poor plastic fluid; 4 is stored in addition to layering, Apart from the analysis of hydrazine and precipitation, the binder in the ink system is not stable; 5 is the addition of poor thinner or varnish, etc. during packaging printing.
Method: 1 Add phenyl ether or propyl ether produced by Shanghai Jinshan Chemical Plant; 2 ink layering problems, such as polyamide and nitrocellulose mixed, usually first put the cotton liquid, and then add the polyamide solution while stirring; and immediately eliminate; 3 When several resins are blended, it is best to use 3% to 5% of ethylene glycol phenyl ether or propylene glycol stupid ether to make the polymer take the polymer to mutual solubility; 4 to change the dilution solvent (do not delaminate after dilution with the ink, Turbidity and whitishness; 5 Add TM-27 coupling agent, bentonite or white carbon produced by Tianyang Chemical Factory; 6 The problem of precipitation of ink (surface like a layer of resin liquid), generally due to solvent and resin If the solubility is not balanced, if you find a solution, first, calculate the solubility of the solvent and the resin. Try to reach an agreement as much as possible. Generally, the energy is greater than 0.75, and the lower 0.75 is better; the second is the expansion of bentonite, but the composite printing ink Usually, silica is added to prevent the precipitation of pigments; 7 ink precipitation problems, such as 6 can also lead to precipitation, once the failure occurs, the resin should be increased, and the amount of pigments and fillers should be reduced; adding wax and soil to extend the grinding time / Oil The finer the fineness of the ink, the better; and add the TM-27 coupling agent (that is, increase the concentration, but also improve the adhesion); 8 put a stir bar in the ink fountain; 9 then spread the ink to filter; 10 change New ink; (11) Add universal solvent to make the several resins in the ink system reach mutual solubility; (12) Select ink with high viscosity; (13) Select pigment with light specific gravity or use deflocculant; (14) Add solvent with strong solubility.
Analysis: Cause of the precipitation of ink
Stratification, precipitation, precipitation