Other failures and remedies of this type of ink (flexible letterpress and gravure) in the printing process are the same as those of gravure printing.
1. Hue inaccurate:
1 Ink itself is not correct;
2 ink viscosity is too low;
3 Ink system co-solvent loses the solubility of the resin or invades the acidic substance and delaminates or precipitates;
4 ink stirring uneven;
5 poor ink fluidity and poor transfer.
Remedy:
1Incorporate the original ink or replace it with ink.
2 Add 3-5% of ethanol or isopropanol or ethanol and stir for 3-5 minutes to make it miscible (adjust its viscosity).
3 alcohol amine, and then stirred, filtered to restore the ink ink, and then printed on the machine.
4 Check whether the printing plate and the ink roller are aging or the roller is clogged. Generally, clean the plate and ink roller or re-plate or replace the ink roller.
2. It is difficult to highlight the main reasons:
1 ink thixotropic;
2 The foam is not eliminated (usually excess defoamer will be more difficult to eliminate, but also will produce shrinkage);
3 solvents are volatile.
Remedy:
1 After the ink tank is opened, the ink should be agitated for 3-5 minutes (the glass rod can be inserted into the line) and then used;
2 Adding 0.1-0.2% of defoamer or adding 5-15% of isopropanol to make the foam disappear and printing (if it is rosin resin ink, add cheap inorganic salt water);
3 Add a suitable solvent (such as ethanol or butyl ethers).
3 poor film formation:
1 high ink viscosity;
2 graphics outline edges do not dry;
3 The absorbability of the substrate (such as copper plate paper) is poor;
4 ink drying is not good;
5 Printing pressure is too large or too small.
Remedy:
1 Lean balance ink;
2 adjust the printing pressure and pay attention to pad version;
3 exchange good dry ink (or add ethanol or ethylene glycol);
4 exchange the substrate.
4. Reasons for crushing graphics and text:
1 poor print quality;
2 Pressing contact is too tight;
3 ink viscosity is too high;
4 The ink is not evenly stirred.
Remedy:
1 pad version and adjust the level of printing balance;
2 adjust the printing pressure;
3 adjust the viscosity and switch to low viscosity ink;
4 Reasonably mix ink.
5. The main reason for overprinting is not allowed:
1 The difference between the PH value of the substrate and the PH value of the ink is large, especially the surface tension is not balanced;
2 The first color pressure is too high or the viscosity is too high;
3 The first color ink film formation is too fast;
4 background is too smooth,
Remedy:
1 control or choose substrates with almost the same surface tension or close PH value;
2 The second-color printing pressure increase or the second-color printing pressure should lightly or dilute the first-color high-viscosity ink;
3Adjust the dryness of the first color ink, especially the microreinability of the film with the second color ink (do not try to crystallize the first color, that is, after the mirror surface is not completely dried, print a color) .
6. Graphically blurred main reasons:
1 bad quality of the plate;
2 ink viscosity;
3 ink dispersion is not good;
4 plate and ink roller contact too tight.
Remedy:
1 plate to be smooth or smooth;
2 Adjust the viscosity of the ink and control it in 25-35S/coating -4 cups;
3 fully stir the ink;
4 Adjust printing pressure.
7. The main reason for the lack of transfer:
1 Insufficient printing pressure;
2 The hardness of the flexographic plate is not enough, the gravure (text) is too deep or the anilox roller is blocked;
3 water-based paper is too strong;
4 ink loss, aging;
5 poor ink flow.
Remedy:
1 increase the pressure;
2 Check the hardness of the flexographic plate should be 42 ± 3% as well, replace the gravure (required for 25-45 micron to replace the elastic flexible version) or eliminate the anilox roller, gravure block;
3 use strong hydrophobic ink;
4 Clean the ink spots on the dried plate, and pay attention to the surface treatment of gravure rust.
8. Immersion film is mainly due to:
1 ink film is not water resistant;
2 is not resistant to light;
3 is not wear-resistant (refers to the printing ink ink film dry).
Remedy:
1 exchange the new ink or make up the resin solution (the PH value is controlled between 8-9.3);
2 Replace lightfast ink or add anti-ultraviolet absorber;
3 Use an appropriate amount of ink (such as acrylic or add calcium).
9. Ink film pinhole main reasons:
1 Chemical pinholes (1) Insufficient or excessive defoamer; (2) Ink dilute too much: (3) Ink of low viscosity ink is too much; different pinhole locations, different sizes and quantities are also different;
2 Mechanical pinholes (rough layout or ink rollers are defective or unintentional) The pinholes will repeat in the same area, in the same area and in the same number.
Remedy:
Chemical pinholes:
1 Add an appropriate amount of defoamer;
2 should be incorporated into the original ink.
Mechanical pinholes:
1 Airprint run-in or replace printing plate;
2 Correct the ink roller and adjust the printing pressure.
10. Main reasons for ink foaming:
1 Defoamer deficiency or excess;
2 ink dilute too much;
3 Low-viscosity inks are inked with excessive ink; poor ink foam inhibitors or insufficient circulation of ink; or leaky pipes.
Remedy:
1 Defoamer should be controlled at about 0.2%;
2 increase the circulation of ink;
3 Replace the pipe or repair the damage;
4 The ink is best stored for 48 hours before it is used (wait for the foam to disappear and stabilize).
11. Main reasons for ink gelation:
1 with wrong solvent;
2 mixed with different types of ink;
3 poor storage environment;
4 Ink deterioration over time.
Remedy:
1 Use a good solvent, especially the appropriate amount of cosolvent (ethylene glycol, glycol ethers);
2 select the same performance, with the brand manufacturers of ink, the deployment of base color ink;
3 It is necessary to accurately place the ink when adjusting the ink.
4 After the ink is sealed and stored in a dry and ventilated and dry place;
5 Replace ink (add TM-3 or inorganic salt anti-gelatin in ink).
12. Plate wear main reasons:
1 contact too tight;
2 Ink has coarse particles;
3 paper dust mixed with ink (especially ink fountain);
4 printing pressure too heavy;
5 The quality of the plate is poor.
Remedy:
1 Re-adjust the contact;
2 filter ink;
3 cleaning ink fountain (or regular);
4 adjust the pressure;
5 re-version. (Liu Jiaju) ("Printing Weekly")
1. Hue inaccurate:
1 Ink itself is not correct;
2 ink viscosity is too low;
3 Ink system co-solvent loses the solubility of the resin or invades the acidic substance and delaminates or precipitates;
4 ink stirring uneven;
5 poor ink fluidity and poor transfer.
Remedy:
1Incorporate the original ink or replace it with ink.
2 Add 3-5% of ethanol or isopropanol or ethanol and stir for 3-5 minutes to make it miscible (adjust its viscosity).
3 alcohol amine, and then stirred, filtered to restore the ink ink, and then printed on the machine.
4 Check whether the printing plate and the ink roller are aging or the roller is clogged. Generally, clean the plate and ink roller or re-plate or replace the ink roller.
2. It is difficult to highlight the main reasons:
1 ink thixotropic;
2 The foam is not eliminated (usually excess defoamer will be more difficult to eliminate, but also will produce shrinkage);
3 solvents are volatile.
Remedy:
1 After the ink tank is opened, the ink should be agitated for 3-5 minutes (the glass rod can be inserted into the line) and then used;
2 Adding 0.1-0.2% of defoamer or adding 5-15% of isopropanol to make the foam disappear and printing (if it is rosin resin ink, add cheap inorganic salt water);
3 Add a suitable solvent (such as ethanol or butyl ethers).
3 poor film formation:
1 high ink viscosity;
2 graphics outline edges do not dry;
3 The absorbability of the substrate (such as copper plate paper) is poor;
4 ink drying is not good;
5 Printing pressure is too large or too small.
Remedy:
1 Lean balance ink;
2 adjust the printing pressure and pay attention to pad version;
3 exchange good dry ink (or add ethanol or ethylene glycol);
4 exchange the substrate.
4. Reasons for crushing graphics and text:
1 poor print quality;
2 Pressing contact is too tight;
3 ink viscosity is too high;
4 The ink is not evenly stirred.
Remedy:
1 pad version and adjust the level of printing balance;
2 adjust the printing pressure;
3 adjust the viscosity and switch to low viscosity ink;
4 Reasonably mix ink.
5. The main reason for overprinting is not allowed:
1 The difference between the PH value of the substrate and the PH value of the ink is large, especially the surface tension is not balanced;
2 The first color pressure is too high or the viscosity is too high;
3 The first color ink film formation is too fast;
4 background is too smooth,
Remedy:
1 control or choose substrates with almost the same surface tension or close PH value;
2 The second-color printing pressure increase or the second-color printing pressure should lightly or dilute the first-color high-viscosity ink;
3Adjust the dryness of the first color ink, especially the microreinability of the film with the second color ink (do not try to crystallize the first color, that is, after the mirror surface is not completely dried, print a color) .
6. Graphically blurred main reasons:
1 bad quality of the plate;
2 ink viscosity;
3 ink dispersion is not good;
4 plate and ink roller contact too tight.
Remedy:
1 plate to be smooth or smooth;
2 Adjust the viscosity of the ink and control it in 25-35S/coating -4 cups;
3 fully stir the ink;
4 Adjust printing pressure.
7. The main reason for the lack of transfer:
1 Insufficient printing pressure;
2 The hardness of the flexographic plate is not enough, the gravure (text) is too deep or the anilox roller is blocked;
3 water-based paper is too strong;
4 ink loss, aging;
5 poor ink flow.
Remedy:
1 increase the pressure;
2 Check the hardness of the flexographic plate should be 42 ± 3% as well, replace the gravure (required for 25-45 micron to replace the elastic flexible version) or eliminate the anilox roller, gravure block;
3 use strong hydrophobic ink;
4 Clean the ink spots on the dried plate, and pay attention to the surface treatment of gravure rust.
8. Immersion film is mainly due to:
1 ink film is not water resistant;
2 is not resistant to light;
3 is not wear-resistant (refers to the printing ink ink film dry).
Remedy:
1 exchange the new ink or make up the resin solution (the PH value is controlled between 8-9.3);
2 Replace lightfast ink or add anti-ultraviolet absorber;
3 Use an appropriate amount of ink (such as acrylic or add calcium).
9. Ink film pinhole main reasons:
1 Chemical pinholes (1) Insufficient or excessive defoamer; (2) Ink dilute too much: (3) Ink of low viscosity ink is too much; different pinhole locations, different sizes and quantities are also different;
2 Mechanical pinholes (rough layout or ink rollers are defective or unintentional) The pinholes will repeat in the same area, in the same area and in the same number.
Remedy:
Chemical pinholes:
1 Add an appropriate amount of defoamer;
2 should be incorporated into the original ink.
Mechanical pinholes:
1 Airprint run-in or replace printing plate;
2 Correct the ink roller and adjust the printing pressure.
10. Main reasons for ink foaming:
1 Defoamer deficiency or excess;
2 ink dilute too much;
3 Low-viscosity inks are inked with excessive ink; poor ink foam inhibitors or insufficient circulation of ink; or leaky pipes.
Remedy:
1 Defoamer should be controlled at about 0.2%;
2 increase the circulation of ink;
3 Replace the pipe or repair the damage;
4 The ink is best stored for 48 hours before it is used (wait for the foam to disappear and stabilize).
11. Main reasons for ink gelation:
1 with wrong solvent;
2 mixed with different types of ink;
3 poor storage environment;
4 Ink deterioration over time.
Remedy:
1 Use a good solvent, especially the appropriate amount of cosolvent (ethylene glycol, glycol ethers);
2 select the same performance, with the brand manufacturers of ink, the deployment of base color ink;
3 It is necessary to accurately place the ink when adjusting the ink.
4 After the ink is sealed and stored in a dry and ventilated and dry place;
5 Replace ink (add TM-3 or inorganic salt anti-gelatin in ink).
12. Plate wear main reasons:
1 contact too tight;
2 Ink has coarse particles;
3 paper dust mixed with ink (especially ink fountain);
4 printing pressure too heavy;
5 The quality of the plate is poor.
Remedy:
1 Re-adjust the contact;
2 filter ink;
3 cleaning ink fountain (or regular);
4 adjust the pressure;
5 re-version. (Liu Jiaju) ("Printing Weekly")
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