This article mainly summarizes and analyzes the causes and solutions of 21 printing defects that are easy to occur due to ink problems.
1. Poor hue (cannot lead to standard hue)
1. Ink viscosity is too low
Solution: add original ink
2. Ink separation and precipitation
Solution: keep stirring the ink bucket
3. Low ink level
Solution: Increase the amount of ink
4. Poor transfer of ink
Solution: Check the roller and printing plate
2. Poor viscosity (cannot reach the specified viscosity)
1. Ink shake
Solution: measure again after ink circulation
2. Foam generation
Solution: add defoamer
3. Solvent evaporation
Solution: add special solvent
4. Too much water dilution
Solution: add original ink and thickener
3. Poor drying of the printed matter (too slow to dry)
1. Ink viscosity is too high
Solution: Dilute ink
2. Pile of ink
Solution: adjust the plate pressure and layout height difference
3. Poor drying of ink
Solution: add quick-drying agent
4. The paper is splashed with water and has poor ink absorption
Solution: replace with paper with better ink absorption
Four, pile of ink
1. Uneven thickness of printing plate
Solution: Correct the height difference of the layout
2. The version pressure is too large
Solution: reduce version pressure
3. Ink viscosity is too high
Solution: add thinner
4. Inking volume is too large;
Solution: reduce the amount of ink
5. Produce burrs
1. Ink viscosity is too high
Solution: reduce ink viscosity
2. Ink drying speed is too fast
Solution: add slow drying agent and adjust the drying speed
3. The version pressure is too high
Solution: reduce version pressure
4. Paper powder mixed into it
Solution: Use the filter to filter the ink
Six, printing is not clear
1. Uneven thickness of printing plate and low hardness;
Solution: Modify the height difference and hardness of the layout
2. The version pressure is too large;
Solution: adjust the version pressure
3. Ink viscosity is too high
Solution: adjust viscosity
4. Too much ink
Solution: adjust the amount of ink
7. Insufficient ink transfer on paper
1. Insufficient printing pressure;
Solution: increase printing pressure
2. Bad version of India;
Solution: Check the hardness of the version
3. Paper splashing is too high
Solution: reduce the surface tension of ink
4. Insufficient amount of ink
Solution: adjust the amount of ink
8. Poor color overprint
1. The background printing pressure is too large;
Solution: increase the color printing pressure
2. The background color viscosity is too high;
Solution: reduce the background viscosity
3. The ink of the background color dries too slowly;
Solution: Speed ​​up the drying speed of the background ink
4. The background color is dark;
Solution: Change the color order
Nine, bubble generation
1. The ink defoaming ability is insufficient;
Solution: add defoamer
2. Insufficient water circulation;
Solution: increase the circulation of ink
3. The ink enters the air from the tube;
Solution: avoid the return tube inserted into the ink
4. Ink viscosity is too high;
Solution: reduce ink viscosity
10. Water mark on the printed surface
1. Too much viscosity and too much coating amount;
Solution: Improve dot reading and increase ink volume
2. Excessive dilution of ink;
Solution: add thickener or original ink
3. The paper has poor ink absorption;
Solution: reduce the surface tension of ink
4. Ink quality is too poor
Solution: replace ink
11. Dry too fast
1. Ink drying is too fast;
Solution: add slow drying agent
2. Poor ink and ink stability;
Solution: add slow drying agent
3. The ink flow is too small;
Solution: add ink flow
4. The temperature of the plant is too high;
Solution: The plant takes cooling measures
Twelve, plug version
1. Poor ink flow;
Solution: Reduce ink viscosity and adjust circulation system
2. Ink and ink drying too fast;
Solution: add slow drying agent
3. Poor ink and ink stability;
Solution: Adjust ink and ink stability
4. Ink and water penetrate into the paper powder and dust;
Solution: Use the filter to filter the ink
5. The viscosity of ink is too high;
Solution: reduce viscosity
13. Spots appear
1. Excessive addition of defoamer;
Solution: pay attention to the appropriate amount when adding
2. The printing ink film is too thin;
Solution: add original ink
3. The ink viscosity is too low,
Solution: add original ink
Fourteen, dent phenomenon
1. Uneven printing layout;
Solution: Correct the layout thickness
2. The paper is too thin, and the bumps between the sticks;
Solution: replace the cardboard and use a cardboard with a higher grammage and thicker thickness
3. Bad operation of printing cylinder
Solution: adjust the plate roller
4. The printing pressure is too large;
Solution: adjust the printing pressure
15. Poor ink delivery
1. The ink viscosity is too high;
Solution: add thinner
2. Too much ink foam;
Solution: Add defoamer as appropriate and mix well
3. Leakage in the circulation catheter;
Solution: replace the catheter
4. Ink residue blocking the catheter;
Solution: clean the ink residue in the tube
16. The printing plate is too worn
1. The version pressure is too large;
Solution: reduce version pressure
2. The printing pressure is too large;
Solution: reduce the printing pressure
3. The thickness of the version is not enough;
Solution: Correct the height difference of the layout
17. Gelation of ink
1. Misuse of solvent;
Solution: use special solvent
2. Mix inks of other brands;
Solution: Confirm with the supplier before mixing
3. Improper storage (unsealed);
Solution: Change ink
4. The ink storage time is too long;
Solution: Change ink
18. Plate area ink
1. The printing plate transfer volume is too large;
Solution: reduce the amount of ink
2. The printing pressure is too heavy;
Solution: relax the pressure
3. The printing ink dries too fast;
Solution: add slow drying agent
4. Paper powder is mixed into it;
Solution: Use the filter to filter the ink
Nineteen, the version is not easy to clean
1. The ink drying is too fast;
Solution: add slow drying agent
2. Improper storage and cleaning of printing plates;
Solution: Wash thoroughly and store properly
3. The printing ink has strong attraction;
Solution: Use strong detergent to clean
Twenty, poor resistance to printed matter
1. Poor light resistance
2. Poor water resistance
3. Wear resistance is not strong
Solution: Negotiate with ink supplier to use suitable ink
Twenty-one, poor printing on high water-repellent paper
The ink viscosity is too low;
Solution: increase ink viscosity
The surface tension of the printing ink is too high;
Solution: reduce the surface tension of ink
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