Patent ID: 6343501
Filing Date: 2002-02-05
Classification: B05C,G01N

Abstract:
A method for determining the process viscosity (&mgr;) of a fluid in a film metering device, the film metering device including a transfer roll, a metering rod and a metering nip in a space formed between the transfer roll and the metering rod, the metering rod having an outer cylindrical surface and being disposed parallel to the transfer roll, the method comprising the steps of:obtaining a pressure profile of the fluid, representing the pressure of the fluid in the metering nip on the surface of the metering rod; measuring a value of a torque (T) applied on the metering rod when the pressure profile is taken; determining a maximum pressure value (Pmax) and a minimum pressure value (Pmin) from the pressure profile and respective positions (Xmax, Xmin) thereof; determining a maximum a value of a circumferential spacing (L) between the position (Xmax) of the maximum pressure value (Pmax) and the position (Xmin) of the minimum pressure value (Pmin); and calculating the process viscosity (&mgr;) of the fluid using the values of the torque (T), the maximum pressure (Pmax), the minimum pressure (Pmin) and the circumferential spacing (L).