Meaning
Liquid extraction from a separating roll system results in the stretching and eventual division of adhesive layers as the surfaces pull apart. Viscoelastic film splitting occurs during the transfer of inks or coatings in high-speed printing and laminating processes. This behavior defines the pattern and thickness of the material left on each surface.
It governs the transfer efficiency of protective coatings in industrial roll-to-roll manufacturing lines.
Fluid Dynamics
High shear rates force the material to behave as both a liquid and an elastic solid simultaneously. This viscoelastic film splitting is characterized by the formation of tiny liquid filaments that stretch and break under tension. This action can lead to the formation of mist or droplets.
Process Failure
Uneven dividing of the fluid layer causes surface defects such as ribbing or orange peel patterns on the finished product. Viscoelastic film splitting can limit the operating speed of coating lines if the material fails to divide cleanly. This restriction degrades the quality of the final output.
Control Mechanism
Viscosity and surface tension are adjusted through solvent addition or temperature changes to optimize the separation behavior. The viscoelastic film splitting process is tightly controlled to ensure uniform coverage across the substrate. This management prevents the accumulation of excess material on the application rollers.
