The proper cleaning of the inking circuit, including pumps, pipelines and applicator heads, is achieved by flowing a washing liquid adequately chosen in accordance to ink characteristics (solvent, water, combined thinners) and using certain functions in sequence.
The basic wash-up sequences are:
• Ink draining from the complete circuit;
• Washing product flow into the circuit;
• Draining of the washing product.
Each operation is carried out with different methods and time frames, depending on type, level of cleaning action and the ink features.
The type of washing products, their quantities and level of purity obviously influence the level of contamination left. However, in order to reduce quantities usage, some washing products can be recycled for a preliminary washing cycle.