Common problems in composite packaging film printing resolution

composite packaging film in some failure are common difficult, high-precision printing, we have some common problems, for example, from the Angle of the process to resolve a specific method.

when composite packaging film printing fault happens why?

performance and drying conditions to dry ink dry ink enough to combine decisions. Ink drying speed of print color level, residual solvents and smell have a decisive role.

1, reserved by scraping in gravure mesh point of ink at the moment to substrates, due to solvent evaporation too fast, viscosity increase and reduce the ink transfer rate. Which affect the color of the print, specularity part less ink, dark part of ink diaspora bad faults.

2, such as a solvent volatilization too quickly can make the system out of balance, ink layer rapid temperature, moisture in the air in the condensation on the scraping blade into the ink, gel water 'vernacular', cause the ink layer of gloss.

3, ink drying speed too slow, due to insufficient drying, solvent evaporation is difficult, would result in higher residual solvents.

how to solve the problem?

1, help maintain the best conditions of drying system, the drying temperature, air velocity, wind speed, and match the printing speed, fully to reduce residual solvents.

2, ratio of solvent to correctly, especially when using mixed solvent, ink good shift from the gravure mesh point, after the transfer is still can keep a good balance of solvent and has good flow property.