Reasons and solutions for printing dyeing

Reasons and solutions for printing dyeing

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From its phenomenon, it is an ink problem. Specifically, the first one is that the substrate or even the polyolefin film is easily permeable to water; the second is a permeate solvent; the third is a transparent dye and a chromogen pigment; and the fourth is that the acid permeability is more serious than the alkaline ink; It is a kind of wax or amide auxiliary. In the end, it is the problem of the binder and coloring matter of the ink - such as low softening point and high impermeability; polyamide resin with low acid and amine value is transparent, and polyamide resin with high acid value is impervious; Even if the printed ink film is dry, it will stick back (especially high temperature, slitting, etc.).

In order to solve this problem, one is to reduce or not use ester solvents; the second is to avoid the use of dyes, chromogens; the third is to choose ink with high PH value; the fourth is to choose ink with high softening point; the fifth is to select acid and amine High value of polyamide resin; sixth is to choose amide or fatty acid-free resin; seventh is to use polyamide resin with less monoacid (generally higher solubility - 10.4 - 10.5); eight is added in its ink A nitro ink that increases its softening point. In order to solve the defects of easy migration, dyeing and the like of the polyamide ink.