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Phenomenon: The printing ink is in the transmission, and the transfer ink is difficult to produce and the ink is inaccurate. Reasons: insufficient or uneven printing pressure; poor plate hardness; ink roller, anilox roller wear, aging; ink and substrate are incompatible; substrate surface is not even; ink drying speed is greater than the printing speed. Solution: Adjust the printing pressure; check the plate hardness; replace the ink roller and anilox roller; check the ink formulation and substrate conditions; exchange the substrate; adjust the ink drying speed and printing speed to match.
Second, the edge of the outline is obvious (graphically collapsed)
Phenomenon: The edges of prints are dark in outline and shallow in the middle. Causes: The viscosity of the ink is too high; the ink is poorly agitated; the amount of ink on the surface of the printing plate is too large; the flatness of the printing plate is poor; the printing pressure is too large. Solution: Adjust the ink viscosity; Reasonably mix ink; Control the amount of ink transfer; Pad version, adjust layout height; Adjust printing pressure.
Third, the line edge hair
Phenomenon: The printed images are not clear, some are halos and feathers, and the edges are burrs. Cause: The ink is drying too fast; the pressure between the anilox roll and the printing plate is too large or uneven; the ink is too viscous to cause fluffing on the plate; the printing plate wears; the static electricity; the printing speed is too slow; the pigment components in the ink are too much or dispersed it is good. Solution: Slow drying agent to reduce the printing ink drying speed; adjust the printing pressure; reduce the viscosity of the ink and clean the printing plate; check the wear of the printing plate; use static eliminator; improve the printing speed; add the solvent and link material in the ink and stir it evenly. .
Fourth, the printing plate wear
Symptoms: Plates produce frictional damage or corrosion and cannot guarantee print quality. Cause: The printing pressure is too large, the contact is too strong; the quality of the printing plate is poor; the ink solvent is selected improperly, the printing plate is eroded; the ink particle is too thick. Solution: Reduce printing pressure, make reasonable contact; fully pad or renew plate; replace solvent; replace fine ink.
V. Pinhole
Phenomenon: The print presents many round holes like pinholes. Causes: Improper adjustment of printing pressure; slight corrosion of printing plates; uneven surface of substrates, granular bulges; drying of ink on anilox rollers; abrasion of anilox rollers, poor ink transfer; large and thin ink, low viscosity; printing ink layer Too thin; mechanical impurities adhere to the plate; poor wetting of the ink; ink viscosity is too low or too slow to dry; ambient temperature is too low, humidity is too high. Solve: increase the printing pressure; improve the quality of the printing plate; replace the substrate; use slow-drying solvent, capping the ink fountain; replace the anilox roller, thicken the ink, increase the viscosity; adjust the ink layer thickness; remove the layout impurities; add additives to improve Ink wetting; increase ink viscosity and dryness; increase room temperature and reduce humidity.
Six, ink is too large
Symptoms: The ink film is too thick, excess ink overflows the graphics, and the lines are roughened. Cause: The viscosity of the ink is too large; the printing pressure is insufficient; the ink is too thin to give too much ink; the anilox roller is too thick; the solvent is used improperly. Solution: Reduce ink viscosity; increase printing pressure; thicken ink, reduce ink volume; use finer mesh anilox roller; use specified solvent.
Seven, ink film is too thin
Phenomenon: The ink is too light and uneven. Cause: The viscosity of the ink is too low; the mesh of the spinning roller is too thin; the anilox roller and the ink roller wear; the ink is not evenly stirred before use; the printing pressure is too small. Solution: thicker ink to increase viscosity and color concentration; use coarse mesh anilox roller; replace anilox roller, ink roller; stir ink evenly; increase printing pressure.
Eight, bonding
Phenomenon: The printed substrates have been stuck together due to the fact that the ink on the substrate is not dry, the drying capacity of the drying system is insufficient, the temperature of the substrate at the time of winding is too high, and the winding tension is too large. Solution: Adjust the solvent to accelerate drying; Adjust the drying system; Install the chill roll or reduce the dryer temperature; Reduce tension.
Nine, ink dry phenomenon: the ink is dry on the ink roller or printing plate of the ink transfer system. Cause: The solvent evaporates too quickly; the ink fountain lid is not covered; the ink has dried on the plate at the time of pad placement. Solution: Use a slow-evaporating solvent; cover the ink fountain cover; clean the plate.
X. Mirage
Phenomenon: There is cloudiness in the printed matter. Cause: poor ink uniformity; low ink volume; poor ink flow; anilox roller is not clean. Solution: Replace the ink roller anilox roller to make it different in diameter; increase the amount of ink; improve ink flow; clean the anilox roller.
Eleventh, small characters are not clear
Phenomenon: Small print and fine print are not clear. Cause: The plate is too hard, the resolution is not good, the ink is poor, the solvent is not properly formulated, and the printing operation is a problem. Solution: Reprint the plate; replace the ink; adjust the solvent formulation; note correct operation.
Twelve, overprinting is not allowed
Phenomenon: The position of the overprint before and after color printing is inaccurate. Cause: Improper control of printing tension; thin and thick roll stock or flounced edges; insufficient accuracy of the press. Solution: Adjust the printing tension; improve the state of the web; adjust the printing accuracy.
Thirteen, ink viscosity instability
Phenomenon: The ink viscosity increases during the printing process. Cause: The thixotropy of the ink is poor; solvent components volatilize and the ink blisters. Solution: Determine the thixotropy of the ink after circulation; add a special solvent to adjust the viscosity of the ink; ink defoamer defoaming.
Fourteen, ink foaming
Phenomenon: The surface of the ink in the ink fountain is covered with a layer of air bubbles; the ink is easy to splash when printing; the air bubbles accumulate more and more, and the ink is not easy to overflow, so that the printed product has pinholes or unclear phenomenon. Cause: The ink circulation is excessively agitated; the printing speed is too fast; the surface tension of the ink solvent is improper; the ink viscosity is too large. Solution: reduce the stirring cycle; reduce the printing speed; add defoamer to improve the surface tension of the ink; add solvent to reduce the viscosity of the ink.
Fifteen, ink bleaching
Symptoms: The ink gels locally, and after the solvent evaporates, the ink film absorbs water and appears white. Cause: The latent heat of solvent evaporation is large; the temperature is too high; the resin precipitates. Solution: Change the composition of the solvent; lower the temperature; change the mixing ratio of the mixed solvent and add butanol.
Sixteen, ink hydration
Phenomenon: The solvent volatilizes during printing. Moisture in the air is absorbed into the ink, which increases the viscosity of the binder and precipitates the resin into a gel. Reduced ink fluidity, reduced gloss, poor transfer, easy paste, severe ink separation. Causes: High temperature and high humidity; The solvent dries quickly; The solvent evaporates on the ink and ink roller. Remedy: Reduce temperature, temperature; use slow-drying solvent; safety seal.
Seventeen, ink gelation
Phenomenon: The viscosity of the printing ink increases, the stirring does not flow, and the gel appears as a paste. Cause: The viscosity of the printing ink is too high; wrong solvents are used; improper storage; the ink deteriorates over time. Solution: Reduce the ink's consistency; use a special solvent; seal the ink; change the ink.
Eighteenth, prints are not rubbed
Phenomenon: After the prints are rubbed, the ink film falls off. Cause: The ink is too thin; the ink has poor adhesion; the binder fails; the ink film surface is too dry. Solve: thicken ink; change the adhesion of good ink; add wax type slip agent; printed on the surface of the product protective cover Varnish.
19, cross-color
Phenomenon: The ink on plastic prints can be transferred to other items and dirty other objects. Cause: The ink color material is easy to migrate; residual solvents, moisture, and plasticizers remain in the ink layer. Solve: Use ink that does not migrate pigment; heat it to evaporate its residual part.
Flexographic Printing Failure Analysis
First, poor printing ink transfer