Ink plays an important role in printing. But in some flexible packaging factories, ink is one of the factors of "love to cause trouble". In fact, it may not be the fault of the ink, but the operation problem. The editor makes an inventory of printing failures and solutions produced by the ink for reference. 1. Judge the adaptability and transferability of the ink scraper The ink on the gravure printing plate cylinder is not cleaned, the ink in the printing ink tray thickens, and the printed matter will not be colored, dirty, run ink, knife wire, knife line and other phenomena. Dirty printing and ink running are related to the adjustment of ink viscosity. The temporary delamination of ink can cause hanging ink. High ink viscosity will cause ink running, but it is closely related to whether the angle and pressure of the scraper device are correct or not. . It is only when the ink on the full printing plate roller is not cleaned, and when the pressure on the finger or the new ink is not cleaned, it may be that there is a problem with the ink. If you can scrape clean after replacing the new ink, it is the thinner added to the ink. Solution: replace the ink or thinner, and readjust the scraper. 2. Inspection of printed substrate (plastic film) Ink leaks, white spots, orange peel, poor adhesion, etc., the surface tension and static electricity of the printed substrate must be detected first. If the surface tension of the printing substrate is lower than 35dyn, the adhesion of the ink will be poor, and orange peel, ink spots, and whiskers will appear in the electrostatic assembly. The ink dries too fast, forming a blockage, and the printing is missing and white spots. Solution: Re-treat the surface of the printing substrate, install static elimination equipment in the relevant parts of the printing machine, add humidity to the work site, and adjust the drying speed of the ink with a slow-drying solvent. If the printing ink is thinned, the effect of increasing the printing speed will be better. 3. Purity and odor inspection of thinner The purity of the diluent from the original ink to the diluted ink is poor, so the solvent residue of the printed product will increase, and the odor may remain on the printed product. First check the purity of the solvent. The simple test method is: pull 8? Wide white paper strip into the solvent and wet it, then take it out and wave it vigorously. Observe whether the drying speed of the solvent on the white paper strip or the color change, and then Sniff whether there is residual odor on the white paper strip. The white paper strip is waved for 8 to 15 times, and the solvent volatilization and drying is normal. If it is not dried, the solvent volatilization rate is slow, and vice versa. The white paper strip is discolored, except for the rust in the solvent barrel, indicating a problem with the solvent. After the solvent volatilizes, if there is a residual smell, the solvent is not pure enough. Scrape the original ink and diluted ink on the film, test after drying. A larger scraping residue of the original ink, and a smaller scraping residue of the diluted ink indicate normal, otherwise the diluted solvent has a problem. If there is residual smell in the scraped sample of the original ink, there is a problem with the ink. If the scrape of the diluted ink smells strange, it proves that the solvent used in the thinner is not pure. Solution: replace the ink or adjust the solvent of the thinner. 4. Proper use of slow drying agent The slow-drying agent in the ink, or the slow-drying thinner used in the printing ink is incorrect, will cause the printing to bite (eat or dissolve) the phenomenon of color, and the printed matter will appear to dry or reverse sticking. Solution: Change the thinner formula of the printing ink, adjust the drying performance of the printing ink, and increase the printing speed. 5. Application of thinner with different ratio Different ratios of ink thinners in printing can adjust the drying performance of the ink, the color density of the ink, and the viscosity of the ink. Adjusting the drying property of the ink is helpful to increase the printing speed and improve the clarity of the printed matter. Adjusting the color density of the ink can reduce the pressure of the impression rubber roller or the workload of the ink scraper, which is conducive to the improvement of the printing speed. Adjusting the viscosity of printing ink is the key to controlling the amount of inking or adapting to the printing speed and room temperature of the printing place. The solution is: according to the printing speed, the depth of the graphics or the number of lines produced on the printing plate roller (roller) cylinder, the room temperature of the printing place, and mix the fast-drying, medium-drying, slow-drying or ultra-drying thinner. 6. How to use from high viscosity to low viscosity The printing speed is slow, and the print version is relatively deep. High-viscosity printing inks need to be used, otherwise the patterns on the printed products will form water ripples due to the low viscosity of the ink. The printing speed is fast, and the printed version of the graphics is relatively light. It should be printed with ink with low viscosity. Otherwise, the printed pattern will be insufficient due to high ink viscosity, and the ink will not be enough or the coating will be missed. Large, so that the printing speed can not be opened up. The solution is to apply thinner and diluent to adjust the viscosity of the printing ink. 7. In the use of spot color ink and metal ink, the use of ink leveling roller Spot color printing requires consistent and uniform ink color, and copper and gold powder in metal ink are easy to settle, so it is very necessary to use a uniform ink roller in printing, and an ink stirring rod should also be placed in the printing ink tray. In addition, in the use of spot color inks, the thinner should be used in conjunction with the diluent, and it is not appropriate to use a solvent alone to dilute. Metallic ink should not be diluted with solvent. The correct method is to add dilute agent to adjust. 8. Use and mixed use of non-true solvents Although the non-true solvent solvent cannot dissolve the connecting resin in the ink, using this feature, the use of diluted ink mixed with the true solvent can reduce the viscosity of the printing ink and reduce the phenomenon of biting (eating or dissolving) during printing. 9. Adhesion test of printed products Use adhesive tape to stick to the printed matter, flatten it with your fingers, and make it tightly combined with the printed matter, and then slowly lift it half of the full length, and then quickly lift the other half. The less ink that sticks from the printed matter, the stronger the adhesion of the ink on the printed matter, and the worse the adhesion. If the ink on the printed matter is stuck by more than 40%, the adhesion of the printed ink on the printed matter is unqualified . Product details
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Completely solve the ink problem of flexible packaging printing, a total of nine steps