Printed version of the dirt of composite bags ( With dirty) And bleaching

Print the graphic part of the composite bags have not shave ink, transferred to the membrane, formation of atomization and surface shape of ink smudgy, black and blue ink appear more easily. Causes: 1. Iron to reduce the efficiency of scraping 2. Plate chrome plating quality bad or wear caused by surface damage 3. Ink in the impurity content, coarse particles and other debris jacking the scraper 4. Ink adhesion of the plate is so strong or ink scraper adaptability is not strong, Lubrication bad adaptability) Solution: 1. Increase the squeegee pressure, adjust the Angle of scraper location and 2. Replace or grinding blade 3. Belong to the plate surface roughness causes, in polishing plate 4. Reduce the ink viscosity and concentration ( Add 5 & ndash; 10% thinner) 5. Reduce the speed or position blowing to the design, make not scrape ink dry quickly. 6. Replace the ink. Albino printing bleaching and can be divided into solvent bleaching two kinds of bleaching and ink resin. 1. Solvent bleaching reason: this albino phenomena appeared in the alcohol soluble ink, when humidity is high, due to the latent heat of evaporation of the solvent, near ink film can be cool, make water mixed with, cause the ink bleaching. When using high latent heat of evaporation of the solvent, more prone to the phenomenon. Ethyl acetate: 87. 63 calories per gram toluene: 86. Card/g methanol: 363. 3 CARDS per gram isopropyl alcohol: 161. 73 calories per gram of ethanol: 208. 7 card/g butyl: 79. 3 CARDS/g solution: to increase the environmental humidity as far as possible, reduce the ink drying speed. 2. Causes: resin albino ink solvents in balance, true solvent volatilization, first remaining in the ink and thinner, make resin precipitation precipitation in ink, cause albinism. Solution: replace the formula ratio of the solvent; Replace the ink; Add the volatile slow solvents.