[China Packaging News] Whether the plastic film printing is going smoothly and whether the printed matter is excellent, the preparation of the ink thinner is also very important, especially the gravure printing. The size and viscosity of the gravure ink concentration (thickness) directly affect the color difference of the printed matter and the clarity of the printed pattern, which causes the increase of the printing waste rate and even determines the printing speed. Therefore, the ratio of the ink thinner is very set important.
First, different performance inks should be mixed with different solvents. Secondly, according to the environmental temperature, humidity, printing equipment, printing speed and printing plate roller of the printing operation, the preparation ratio of the solvent should be determined.
The printing room temperature is around 20 ℃ and the printing speed is between 50 and 100 meters per minute. The formula and ratio of the four thinners for plastic gravure printing are provided for gravure operators:
1. The ratio of the thinner used in the plastic gravure ink in Indian:
Quick-drying solvent: ethyl acetate 20 %, toluene 80 %
Intermediate solvent: 20% ethyl acetate , 80% or 100% toluene
Slow drying solvent: ethyl acetate 20 %, xylene 80 %
(Note: alcoholic solvents cannot be added, but 5-20% methyl ethyl ketone should be added when the climate and humidity are high )
2. Mixing ratio of thinner for surface printing plastic gravure ink:
Quick-drying solvent: ethyl acetate 20 %, toluene 40 %, isopropyl alcohol 40 %
Intermediate solvent: ethyl acetate 5 %, toluene 55 %, isopropyl alcohol 40 %
Slow drying solvent: xylene 50 %, isopropyl alcohol 50 %
Very slow drying solvent: xylene 50 %, isopropyl alcohol 50 %, n-butanol 1-3 %
3. Mixing ratio of alcohol-soluble plastic gravure ink using thinner:
Quick-drying solvent: ethyl acetate 50% , absolute ethanol 50%
Intermediate solvent: 20% ethyl acetate , 80% isopropyl alcohol
Slow drying solvent: absolute ethanol 50% , propyl acetate 50%
4. Mixing ratio of diluent for cooking plastic gravure ink:
Quick-drying solvent: ethyl acetate 30% , isopropyl alcohol 20% , butanone 50%
Intermediate solvent: isopropyl alcohol 10% , toluene 40% , butanone 50%
Slow drying solvent: toluene 60% , methyl ethyl ketone 35% , propylene glycol methyl ether 5%
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