Gravure composite film didn't dry, consider these seven reasons

Due to the thick ink, gravure composite film so poor drying problem always there. Gravure printing characteristic is wet wet stack, although there is a long path, but the gravure before folding color when color ink is not dry, just in the ink layer on a layer of film, in order to prevent ink color group after before folding color with the color of the ink stick. Gravure product didn't dry, one of the causes of the seven gravure mesh hole deep, sometimes more than 60 mu m, inking quantity is big, dry and may have difficulty. 2, in order to ensure the highlights of the small branch transfer printing, intaglio printing process must be added in the slow drying agent, it will also affect the ink drying effect. 3, as the overall balance of the mixed solvent is not easy to master, slow drying agent a lot of stranded. 4, some in the printing process, the final color print white ink and then winding, drying, and the distance between the winding station too short, dry and difficult. The palm and white ink for ink has good covering power, can only upset the ink layer. In general white ink inking amount is the largest of all colors. 5, gravure composite film printing, the temperature of the drying device cannot be too high, bake, not too long, otherwise the membrane will happen tensile deformation, affect the overprint precision and the length of the product. Commonly used method is to use low temperature, large air volume, adopts the volatilization method on drying technology, abandoned the evaporation. 6, solvent volatilization reliance on environmental conditions, when the pressure of environment is low, the mechanical ventilation devices is difficult to effectively control the drying efficiency. 7, the printed ink layer on the surface of the contact surface with the atmosphere there is a boundary layer, Foreign counterparts called & other; Boundarylayer” , some people will be translated into & other; Mirror film & throughout; ) , this is a layer containing a mixture of hot air and vapor, temperature is higher. Ink dry under the action of high temperature, the liquid solvent will evaporate and move to the boundary layer, if without solvent in the boundary layer, the vapor is easy to transfer to the atmosphere. But as the boundary layer in the increase of the concentration of the solvent steam evaporation of the solvent ratio will be reduced, when the boundary layer of solvent vapors tend to be saturated, evaporation process will stop. Traditional gravure drying process is not attach importance to the existence of boundary layer, ignored the role of evaporation in a dry, although the industry of gravure press the curve of the bake, made some improvements, reduce the wind resistance, increase the air volume, but as a result of this layer is not let air flow boundary layer, some not in the ink volatile will still wrapped in the residual solvents.