Flexographic Coating

Process Mechanism

An engraved anilox roll transfers precise volumes of the coating medium onto a flexible photopolymer plate during the print rotation. The plate contact defines the area of coverage, which either spans the entire sheet or limits itself to specific graphic zones. Operators adjust the cell depth of the roll to ensure the wet film thickness stays within target limits for viscosity and gloss.

Precise control prevents excessive moisture from entering the fibrous structure of paperboards, as such intake triggers curling or drying line failure. Heavy deposits increase the cost per unit while insufficient application leaves the underlying ink susceptible to surface damage.

Application Tolerance

Consistent output depends upon the alignment of pump pressure, doctor blade tension, and ambient heat levels inside the press drying box. Converting operations require a slip coefficient that allows cartons to move smoothly through automatic filling lines without jamming. Variable ink absorbency across different grades of recycled fibre necessitates real time monitoring of the fluid application rate to maintain optical uniformity.

Final dry weight measurements confirm that the barrier film resists abrasion during secondary logistics cycles.