Woven bag ink printing failure and troubleshooting

First, adhesion is not strong
Reasons: 1. Substrate surface and laminating or woven bag surface is too smooth (untreated or poorly processed); 2. Ink complexes (ie additives) are improperly selected or used insufficiently; 3. Dissolution of the ink system Hydrogen bonding force and the hydrogen bond strength of the woven bag substrate are too different. 
Remedy: 1. Make the surface of the woven bag substrate reach about 38dyn; 2. Add 5% of chlorinated paraffin before stretching of the plastic yarn; 3. Select the ink very carefully (same property); 4. Use the ink Should be appropriate, as far as possible the use of small viscosity and ink system resin content of high ink; 5. Increase the printing pressure. 
Second, print adhesion
Causes: 1. Sticky bag or adhesion after rewinding during printing; 2. Printing too fast, rewinding too tightly; 3. Dryer angle is incorrect or malfunctioning; 4. Dryness of ink is too slow; 5. Storage stacking Heavy pressure is too large; 6. The temperature is too high and the cooling is not complete or the ink is not heat-resistant; 7. Ink dilute infiltration back through India. Remedy: 1. Adjust the print speed, check the drying device angle; 2. Improve the dryness of the ink (or increase the ethanol 90 + ethyl ester 10% mixed thinner); 3. In the printing when the stack is less or the storage stacking load should be light 4. Reduce the temperature of the workshop or warehouse (open the door to allow air convection, etc.), replace the heat-resistant woven bag ink; 6. Add the original ink to increase its viscosity or add a small molecular weight and volatile solvent dilution (Recommended Ink factory production of special thinner). 
Third, residual odor
Reasons: 1. Ink has odor of raw materials; 2. Ink deterioration. 
Remedy: 1. Do not use odorless raw materials as much as possible; 2. Add spices (masking agents) and prevent impurities from penetrating into the ink system; 3. Ink production pay attention to the solubility of the mixed solvent to the resin or the ink is stored in In a cool and cool warehouse. 
Fourth, poor film formation
Reasons: 1. The printing speed does not match with the drying device or the dryness of the ink; 2. The misuse of the diluent; 3. The ink itself is not dry (such as too slow or too fast). 
Remedy: 1. Increase the air blow or increase (extend) the post-printing conveyor belt; 2. Adjust the printing speed (note the ink film thickness after printing); 3. Re-exchange dry fast (film-forming) ink; 4. Replace the ink; 5. Re-dilution or add a fast volatile solvent. 
Fifth, blocking version: 
Reasons: 1. The main reason is that the dry ink on the printing plate makes the ink transfer poor; 2. The plastic or paper mixed in; 3. The ink crust.排除 Remedy: 1. Adjust the blowing angle (not directly on the printing plate); 2. In addition to changing the substrate, the upper side of the printing press should be separated from the ink fountain roller by the base paper, plastic or film; 36 Replace the new ink or add 10% antioxidant to the ink fountain. 
VI. Printout or Migration
Reasons: 1. The ink is too thin (ie the viscosity is too small); 2. The paper or plastic substrate is thin; 3. The ink volume is too large; 4. The printing pressure is too heavy; Remedy: 1. Incorporate the original ink or add a thickener; 2. Replace compact substrates; 3. Replace dry ink or add fast solvent; 4. Adjust (decrease) ink supply; The pressure should be small. 
Seven, bleeding color
Causes: 1. The printed image is oozing at the edges (generally due to the dyes used in the ink); 2. The pigments used are not properly matched or the ink is rancid and deteriorated; 3. The thinner materials used are too much, especially with the ink. Poor sex material. 
Remedy: 1. Add gold oil or add coupling agent to the ink; 2. Select solvent (such as alcohol solvent) type pigment or exchange new ink; 3. Use less dilute material as much as possible, especially the solvent that is compatible with ink. . 
Eight, ink film no light
Causes: 1. Gloss difference; 2. Film formation process inhalation of water distribution white; 3. Ink roughness; 4. Ink drying too fast; 5. Ink system resin component is small or wrong matting agent. 
In high temperature and high humidity in summer, especially in the coastal areas, the ink absorbs the moisture in the air during the printing process and damages the oiliness, thereby reducing the gloss. 
Remedy: 1. Add 3% to 5% cyclohexanone or 2% to 4% ether in the ink to resist intrusion of water molecules; 2. Repolish or filter the ink; 3. Use slow-drying solvent to refill the ink system 4. Add the appropriate amount of ink in the ink fountain plus 5% to 15% of the resin dissolved; 5. As little or as little as matting agent (such as wax, silica, etc.); 6. Replace the ink with good gloss or Use less solvent to dilute.