Woven bag ink printing failure and troubleshooting
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
First, the adhesion is not strong
Causes of failure: 1. The surface of the substrate and the surface of the film or woven bag are too smooth (untreated or handled badly). 2. Ink complexes (ie, auxiliaries) are improperly used or insufficiently used. 3. The dissolved hydrogen bonding force of the ink system is too different from the dissolved hydrogen bonding force of the woven bag substrate. Remedy: 1. The surface of the woven bag substrate reaches about 38 dynes. 2. Add 5% chlorinated paraffin before stretching the woven silk. 3. Ink selection should be very careful (same nature). 4. The use of ink should be appropriate, as long as the viscosity is small and the resin content of the ink system is high. 5. Increase printing pressure.
Second, the print adhesion
The cause of the failure: 1. Sticky bag after the printing stack or after the rewinding. 2. Because the printing speed is too fast, the rewinding is too tight. 3. The drying device is not in the right angle or malfunctions. 4. The ink is too dry. 5. The storage stack is too heavy. 6. The temperature is too high and the cooling is not complete or the ink is not heat resistant. 7. The ink is too thin and transparent. Remedy: 1. Adjust the printing speed and check the angle of the drying device. 2. Improve ink dryness (or increase ethanol 90+ ethyl ester 10% mixed diluent). 3. When stacking, the stacking should be less or the storage load should be lighter. 4. Reduce the temperature of the workshop or warehouse (open the window to make the air convection, etc.), and change the heat-resistant woven bag ink. 5. Add the original ink to increase its viscosity or add a solvent with a small molecular weight and volatilize the solvent quickly (recommended by the ink factory).
Third, residual odor
The cause of the malfunction: 1. The odorous raw material in the ink. 2. The ink deteriorates. Remedy: 1. Try not to use odorous raw materials. 2. Add perfume (masking agent) 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 stored in a ventilated and cool warehouse.
Fourth, poor film formation
The cause of the failure: 1. The printing speed does not match the drying device or the dryness of the ink. 2. Misuse of thinner. 3. The ink itself is not dry (such as too slow or too fast). Remedy: 1. Increase the blowing or increase (extend) the post-press belt. 2. Adjust the printing speed (pay attention to the thickness of the ink film after printing). 3. Re-adjust dry (film-forming) ink. 4. Change the ink. 5. Re-diluted or added a solvent with a high rate of volatilization.
Five, blocking
The cause of the failure: 1. Mainly the dry ink on the printing plate makes the ink transfer poor. 2. Mixing of plastic or paper dust. 3. Ink crust. Remedy: 1. Adjust the blowing angle (not directly blown onto the plate). 2. In addition to changing the substrate, it should be separated from the ink on the upper side of the printing machine by the base paper, plastic or film. 3. Change the new ink or add 10% antioxidant to its fountain.
Six, through printing or migration
The cause of the malfunction: 1. The ink is too thin (that is, the viscosity is too small). 2. The paper or plastic substrate is thin. 3. The amount of ink is too large. 4. The printing pressure is too heavy. 5. The film formation is too slow. Remedy: 1. Incorporate the original ink or add a thickener. 2. Change the dense substrate. 3. Change to a good dry ink or add a solvent that evaporates quickly. 4. Adjust (reduce) the amount of ink supplied. 5. The printing pressure should be light.
Seven, bleed
The cause of the failure: 1. The edge of the printed graphic is immersed in color (generally due to the selection of dyes in the ink). 2. The pigment used is improperly matched or the ink has been rancid. 3. Excessive use of thinner materials, especially the poor compatibility of thinner and ink. Remedy: 1. Add gold oil or add coupling agent to the ink. 2. Select a solvent (such as an alcohol solvent) type pigment or replace it with a new one. 3. Use less thinner, especially solvents that are miscible with the ink.
Eight, the ink film is dull
The cause of the failure: 1. Poor gloss. 2. In the process of film formation, the water is dispensed white. 3. The ink is rough. 4. The ink dries too quickly. 5. Ink system The resin component is added to the matting agent with little or no error. In the summer high temperature, high humidity, 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% of cyclohexanone or 2% to 4% ether in the ink to resist the intrusion of water molecules. 2. Re-grind or filter the ink. 3. Use slow dry solvent to replenish the ink system. 4. Add 5% to 15% resin solution to the ink fountain. 5. Do not add or add less matting agents (such as wax, silica, etc.). 6. Change the gloss of the ink or use less solvent to dilute.