Within the printing industry this ink dispensing system is
used to mix various color pastes composed of 14 to 22 mix pastes. The ink is
used to print packaging.
The process dispensing the paste is based on a certain
weight. This had to be visualized and controlled by ATS. The operator selects a
color; the system calculates the required quantities of the different mixing
pastes and informs the operator when the required amount has been dispensed.
This is done until the desired weight and desired mixing ratio associated with
the color combination is achieved. The current machine (fully working on
compressed air) wass completely operated manually.
A semi-automatic dosing concept was developed, enabling
90-95% of the mixed paste being automatically dispensed and 5% by fine dosing.
The control and visualization use a Unitronics Vision 570 PLC / HMI, which is
connected to a Sartorius balance (scale). The scale supports serial
communication.
A possible future step is to fully automate dispensing.
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