Solving the technical problems of biting color and cross stitch in printing
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Major technical problems in packaging and printing have long plagued people. The problems are mainly concentrated on 1 ink migration; 2 ink film yellowing; 3 printing white spots; 4 back adhesion and adhesion; 5 discoloration and fading; 6 ink film floating white; Pinhole and shrinkage hole; 8 transfer without ink; 9 bite color (commonly known as cross color) and fading; 10 gloss difference (whitening). These printing technology challenges have become a common fault in production.
1. Biting color (commonly known as cross color). In the packaging printing process, when the first or second pass of the color printing, the surface of the ink film on the previous printing will find that the printing ink film is excessively soft and even wrinkled. This phenomenon is called a prelude to bite color. When the ink system contains a strong solvent in the next printing (overprinting), it may completely penetrate the previous ink film and be bitten, thereby being miscible into the latter ink film, which can cause subsequent packaging in severe cases. The printing ink film is mixed with mottling (dyeing). The main reason is that there are soluble components (resins or solvents) in the printing ink.
When printing on such inks, it is necessary to use a dilution solvent. Do not use a strong solvent to adjust the viscosity of the ink or speed up the printing speed to shorten the second or third overprinting time. Use a mixed solvent to debug the re-dissolution of the ink before printing. Solubility) effect to determine the amount of dilution solvent.
2. Poor gloss (whitening). Most of this failure occurs in the printing of volatile dry printing inks. An opaque white ink film layer appears during the rapid evaporation of the solvent after high speed printing. This phenomenon is sometimes temporary, but mostly long lasting. This is because the cooling device adjacent to the drying printing ink film is blown or air chilled to the dew point, that is, the absorbed water (vapor) is returned to the image film to be condensed. If the solvent or pigment in the ink system contains water, it will also cause poor gloss in the printed image. That is to say, the higher the volatility of the solvent, the greater the tendency of the graphic ink film (whitening) of the packaging printing ink to be poor in gloss.
The precautionary measures are: adjust the solvent used for packaging printing ink; increase the high-boiling solvent (such as cyclohexanone, diol, propylene glycol ether, butanol, etc.) to reduce the amount of solvent that is evaporated quickly. In the packaging and printing process, control the workshop. The relative temperature in the environment (air) is below 65%, especially in the rainy season in coastal areas and rainy days in the north.