Application methods and precautions for green packaging inks 2

In order to overcome the summer ink layering and sedimentation, winter ink jelly and thickening and affect the normal packaging printing, we added a reticular structure to the composition of the ink and can contain OH hydrophilic alcohol group ion state in the crystal lattice. The inorganic and organic highly efficient dispersion materials enhance the destructiveness of the anti-electrolyte and stabilize the ink.

Although sometimes as with other printing inks (layering or sedimentation, inks can be restored by merely agitating for 1-3 minutes), ink quality, printing materials, operator skills, and many other factors cause failures to occur. The moments are not clearly identifiable, so they are summarized as faults, phenomena, causes, and remedies around the above situations. In order to prevent and adopt remedial measures for the packaging industry colleagues, we hope that the whole industry will feedback on improvements in a timely manner, break the regional and system boundaries, and improve formulas and process design of green packaging printing inks.

Graphically blurred/printed ink layer is light, graphic and ink are indented, strokes are not clear, ink is light, ink is hard, printing pressure is small, ink has poor transfer rate and adhesion (sometimes even dried in the layout, ink roller or intaglio In), black ink is difficult to condense even in the printing process. The rough surface of the printing material/adjusts the amount of ink and viscoelasticity, fastens the adhesion, increases the printing speed, reduces the printing pressure, increases the viscosity of the ink, and adds highly efficient ultra-dispersing additives.

To improve the ink transfer rate, adjust the printing pressure and select the surface slide material, dilute the ink viscosity (coating - 4 cups not less than 15 seconds, the best is about 25 seconds), improve the drying speed. Crushing and smudging/imprinting results in prints with heavy prints/printing pressures, poor flexing of the layout, or deformation and unevenness of the press rolls/adjusting the ink dry speed or reducing the amount of ink, reducing the pressure of the press rolls, changing the flexo plate and correcting the press rolls .

Dirty and stained/printed backside was stained by overprinting of previous ink or overprinting, or the ink on the belt of the embossing roller was transferred to the next print, the ink was too sticky, and the dryness was too slow. , printing the second color is easy to stick the first color, the surface of the conveyor belt is not clean or swollen, the printing pressure is too high, the speed is too fast, or the thickness of the printing material on both sides is not the same or the rolling tension is not consistent / improve the ink lining (Rate), add a quick-drying solvent or oil, increase the proportion of lubricating anti-adhesive in the ink (96:4), increase the hot or cold blow or slow down the printing speed and extend the printing stroke, select the absorbency or the surface roughness Process the material well to improve the absorption of the surface of the substrate. Note that the stacking load of the print should not be too high or too heavy.

Ink splash / in the printing shop with different size ink dots or droplets splash / ink yield value, viscosity, ink layer thickness and ink film separation is too long or ink too thin, the printer speed is too fast, ink viscosity is too Small and non-static resistance, poor accuracy of the printer and ink roller deformation or surface damage / replace the ink roller (according to the ratio of the plate line and the anilox roller network, choose 1:4 is appropriate), reduce the viscosity of the ink And reduce drawing length and fluidity, reduce ink supply, adjust viscosity, slow down print speed, adjust shop temperature and temperature, replace ink roller and repair equipment, or add antistatic facilities and materials. (to be continued)