Gravure printing ink printing (below)

Nine, poor adhesion fastness is:
1. Use wrong ink or misuse solvent that can not form hydrogen bond;
2. Ingredients in ink are small;
3. The surface treatment of plastic is poor or the surface tension is not well controlled during printing (Note: This surface treatment refers to corona treatment of plastic film surface);
4. The ink film is hard and brittle or the ink is rough;
5. The viscosity is too high, especially ink film is too thick (ink film thickness or printing plate too deep);
6. Printing pressure is too light.
Method of exclusion:
1. Replace ink or use thinner material;
2. Increase the proportion of resin or add the same kind of resin gold transfer oil in the ink fountain;
3. Reprocess the plastic film (adjust tension control device to 38 dyne/cm2);
4. Adjust the ink viscosity at 18-25 seconds / 25 °C, coated with -4 cups;
5. Replace the printing plate (version depth is 25-35 microns);
6. Increase the pressure.
X. The reason for the scratches in printing is:
1. The ink contains debris or ink particles that are thick and hard and brittle.
2. The ink viscosity is too high;
3. Ink adhesion to the plate roller is too strong (affinity);
4. Ink dryness is too fast or too slow;
5. Roller surface is not smooth;
6. The chrome plating is not good, the pattern is too deep;
7. The blade is not straight or damaged;
8. Impression discomfort;
9. Scraper and plate roller angle discomfort.
Method of exclusion:
1 is an ink problem, re-filtering ink, adjust the ink viscosity, replace the ink (texture loose and delicate) or adjust the ink dry speed;
2. A roller plate problem, use a flat and smooth roller, correct the pattern or re-plate, re-chrome plate;
3. Is a squeegee problem, use a straight sharp blade (stiffness and rigidity), adjust the knife angle or adjust the pressure, special scratches should be on the back of the scraping force plus a 1-3mm thick rubber or foam plastic sheet.
Eleven, ink blocked version reasons are:
1. Too dry ink;
Excessive viscosity
3 mixed with paper or plastic shavings, etc.;
4. Poor retinol solubility;
5. The ink is crusted or blown onto the plate (ink dried in the print).
Method of exclusion:
1. Add slow-drying solvent to adjust the ink;
2. Dilute the ink to adjust the viscosity;
3. Filtration of impurities in the ink;
4. Adjust the blowing angle;
5. Add real solvents;
6. Re-clean plate or air-printed section;
7. Add antioxidants.
Twelve, the cause of the bleaching of the ink film is:
1. The rainy season where the ambient temperature is too high or the humidity is too high makes the surface of the ink film forming white.
2. The ink has too much quick-drying solvent to make the ink unbalanced during the volatilization process and produce ink mist.
Method of exclusion:
1. Reduce environmental (workshop) humidity;
2. Increase hot air drying and pay attention to cooling after rewinding, compounding, etc.
3. Increase the true solvent (such as cyclohexanone) to reduce the dry speed;
4. Change the slow drying plasticizing solvent to resist moisture infiltration.
XIII. The reasons for the text of the text are:
1. The imprinting is uneven and the imprinting is not true;
2 printing plate pressure is too heavy;
3. Insufficient ink viscosity (makes the ink in the plate roller pattern flow out before printing);
4. Electrostatic phenomenon.
Method of exclusion:
1. Adjust the pressure balance;
2. Adjust ink viscosity and concentration;
3. Improve the drying speed;
4. Add antistatic dispersant to the ink fountain or connect a ground wire to the printer.
XIV. The reasons for inaccurate tones are:
1. The quality does not match the original;
2. The color is light (poor coloring power) or the ink hiding power is not enough.
Method of exclusion:
1. Replace the ink (close to the original color);
2. Add about 2% white ink to the ink to enhance its hiding power;
3. Incorporate new ink.
15. The causes of ink overflow are:
1. The ink viscosity is too low to cause spots or lines in the full plate section, and some spots appear.
2. Scraper angle discomfort;
3. Plate plate pattern is too deep.
Method of exclusion:
1. Into the original ink or gold transfer oil to increase the viscosity of the ink;
2. Improve the printing speed;
3. Change the blade angle (as good as the acute angle);
4. Replace the plates (25-35 micron pattern).
16. The reasons for orange peel and zebra are:
1. The ink is rough or the resin composition is small;
2. Diluting the solvent by mistake or over-dilution;
3. Substrate surface roughness;
4. Ink filming is too early (fast dry speed) and poor leveling.
Method of exclusion:
1. Filter ink or add resin varnish to the ink fountain;
2. Increase the proportion of nitrocellulose in the ink system;
3. The viscosity can be higher (for example, 25-40S);
4. Add 3-5% cyclohexanone or ether solvent to the dilution solvent;
5. Reduce the air blow and extend the filming time;
6. Use special thinner produced by the ink production plant;
7. Select ink fineness between 5-20 microns.
Seventeen, printing off powder 1. Too much pigment in the ink system and too little resin;
2. The poor solubility of the solvent in the solvent or the lubricity of the binder to the pigment is poor;
3. The viscosity is too low;
4. Mix paper or plastic crumbs;
5. Substrate ink absorption (such as paper) is too strong;
6. The solvent loses the equilibrium of the volatilization speed in the ink.
Method of exclusion:
1. Add ink or ink to ink fountain ink;
2. The solubility of the solvent and the resin is as close as possible (such as adding the true solvent);
3. Add wet adhesion additives in the ink;
4. Increase ink viscosity or reduce the proportion of solvents;
5. Replacing absorbable printing materials;
6. Control the pH (for example, water type inks should have a pH of 8-9.3).
18. The reason why the ink film has lines is:
1. Humidity is easy to produce gas lines;
2. The ink film thickness is easy to produce wrinkles, and the ink viscosity is easy to produce watermarks.
Method of exclusion:
1. Control the temperature of the workshop, usually open the window to convective air or increase the ambient temperature of the workshop;
2. Replace gravure printing plate, usually 25-355 microns is appropriate.
3. Exchange the ink with high viscosity or add 5-10% varnish.
4. Add 1-3% coupling agent or add leveling agent or increase the color and filler.