Common Faults and Countermeasures in Flexible Printing

Flexographic printing substrates are extremely versatile. From soft plastic films to rigid glass products. From two-thousandths of a millimeter of film, aluminum foil, and gauze products to more than ten millimeters of corrugated cardboard. From small bags like toothpicks to giant bags like large mattresses. And all kinds of textiles, furs, etc. can be flexo-printed.
In general, the printing quality is related to the printing speed, the machine condition, the ink, the anilox roller, the printing material, the printing plate, the drying ability and the technical level of the operator. The purpose of this article is to discuss the failures that often occur in printing and the corresponding countermeasures. See the table below

Phenomenon Causes Corresponding Countermeasures Graphic Text Bleeding pigments are dissolved or the inks are poorly dried Use suitable solvents, and increase the drying temperature Pigment diffusion flow, affected by plasticizers or dyes in the substrate materials Avoid the use of dye colorants Adhesion between the two surfaces Adhesion of ink Drying failure Drying temperature or changing to a low-boiling-point solvent. Improper use of solvents. Equilibrium with an appropriate solvent. Rolling up the material before it is heated in a hot state. The content of ethyl acetate in the ink must not exceed 15%. Excessive cleaning procedure Water-soluble cleaning agent for water-based inks, solvent-compatible printing inks, and plate-inhibiting printing plates. Printing patterns are too light and dark. Printing depth is too deep. Too much pressure to reduce the amount of ink supply ink viscosity is too high to reduce the viscosity of the ink to reduce the viscosity of the ink to dry too fast Note the amount of hot air, delay the drying time superimposition of multi-color overprint India and India in the same color when the former color ink does not dry with volatile faster Solvents increase the color ink after the drying temperature of the color is not overprinted to reduce the ink viscosity of the latter color or increase adhesion After the force of the ink layer to make the color of the previous printed peel off phenomenon to reduce the printing pressure of the ink foaming ink internal friction using the appropriate anti-foaming liquid at high speed, the ink fountain roller and the anilox roller equal speed to reduce the speed ratio between the two Excessive fluctuations Check oil pump impeller and gear ink Hydration Rainy season Weather Humidity Control Workshop Humidity Humidity, high temperature Moisture Infiltrate ink Ink tank Grout gel precipitation Weather too cold Ink in warm water Melt, Stir solvent imbalance, Resin separation Out-of-line solvent overprint is not allowed to receive and discharge the material tension is not uniform to adjust the income, release the tension before the color pressure over the ambassador graphic deformation adjustment printing pressure joint uneven re-joint film with lotus leaf edge adjustment tension replacement film roll

The flexo printing process is a more popular technology in foreign countries, but there is no systematic theory in the country, but the provincial unit is still in the stage of exploration. Now I will be a little superficial view, introduced out, in order to get the correction of domestic counterparts. (Jian Wenbao) ("China Packaging Newspaper and Print Weekly")

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