Flexographic Anilox Cell Metering Dynamics under High Shear Rate Regimes
Anilox metering under high shear rate regimes depends on ink rheology and blade deflection balance to prevent hydrodynamic lift and coat weight drift.
Ink Film Thickness
Deposit Dimension
Depth of the wet or dry ink deposit on the substrate surface dictates the colour density and drying characteristics of the print. The ink film thickness influences how light interacts with the pigments and determines the final appearance of the packaging graphics. This value is usually measured in microns and must stay within a narrow range for colour consistency.
Transfer Regulation
Amount of fluid moved from the anilox or gravure cylinder to the paper depends on the cell volume and the pressure of the application. If the film is too thick, the ink may not dry fast enough, leading to smudging or blocking in the reel. A thin film results in washed-out colours and poor coverage of the substrate.
Constant monitoring of viscosity is required to keep the transfer volume stable. The mechanical condition of the doctor blade also affects the uniformity of the layer. Automated dosing systems help to maintain the correct solids content in the ink fountain.
Optical Density
Achieving the correct saturation requires a precise balance between pigment concentration and the physical height of the layer. Heavy films can cause dot gain, where halftone dots expand and lose detail. Maintaining the target thickness ensures that the brand colours remain accurate across different batches of board.