A-C SYSTEM, Automatic equipment for ink (solvent or water based) circulation and cleaning on flexo printing units with closed chamber doctor blade inking.
The A-C System has been realized in order to feed the necessary ink during the printing process and in order to rapidly clean the chamber doctor blade, the anilox roller and all ink pipes completely, during the job change-over time.
The system, completely automatic, has been studied to obtain an optimal cleaning of the complete inking unit in shortest time and with a minimal waste of solvent/water.
The A-C System includes two pneumatic membrane pumps with double diaphragm and a bloc of valves which allows the distribution of the fluids during the inking cycle and the different washing cycles.
The structure of the A-C System allows an easy and fast servicing.
The A-C System is foreseen to accept a viscosity control and regulating equipment.
Due to the fact that the system has a double pneumatic circuit, it allows disposing of two different injecting pressures; one for the inking, and one for the cleaning process.
The A-C System is supervised by a PLC which controls the different inking and the cleaning cycles.
From the operator panel, with a password, the time of each cycle can be modified according the needs of the operator.
The modular construction allows an eventual substitution for maintenance of each single unit in a simple and easy way.
Description of its functioning:
The washing process consists in, first: draining the remaining printing ink from the chamber doctor blade and from the ink pipes and bring it back into the ink tank, second: injecting solvent/water to start the cleaning phase.Two kind of cleaning cycles can be chosen: “hard” or “soft”.
During the cycle “hard”, the first cleaning is done by using semi dirty solvent/water with detergent, which, at the end of the cycle is convoyed into the dirty solvent/water tank.
and the final cleaning with clean solvent/ water, which, at the end of the cycle is convoyed into the semi dirty solvent/water tank.
Cycle “soft” uses only clean solvent/clean water and during a relative short time.
During both cycles, “hard” and “soft”, after the solvent/water ignition, it effects internal recycling and ejecting cycles.
The PLC of this unit controls automatically the draining and injecting sequences for the ink and for the solvent/water.