Prediction Model of Coating Weight for Squeeze Rolls with V-Shaped Grooves

Abstract

Deformation analyses for a rubber-covered roll and a diminutive V-shaped groove carved on the roll are performed in order to predict the coating weight on a strip in squeeze roll coating processes.
The distribution of contact force on the roll is estimated from the deformation analysis on the base of an influence coefficient method, taking into account the deflection of the roll axis and the surface indentations of the inner steel sleeve and the rubber. The surface indentation of the rubber is derived from an elastic solution in a semi-infinite body, i. e., the difference of displacement between the surface and a referential point in the semi-infinite rubber. The position of the reference point in the rubber is determined from the value multiplied by the rubber thickness of the roll by a compensation coefficient depending on the load acting on the surface.
The relation between the deformation of a groove and the load acting on the groove is analyzed by the finite element method as the elastic contact and large deformation problems under the plane strain condition. The coating weight is predicted on the basis of the deformed groove.
An experiment is conducted to verify the accuracy of our prediction model of coating weight, and the relations between the load and the approach of the roll centers, the contact width of the rolls, and the coating weight are examined. The experimental results are in good agreement with the analytical results, and our prediction model is confirmed to be reasonable.