Objective To use ANN to quantitatively predict the influence of the amount of HPMC and its internal viscosity on allopurinol release from HPMC sustained release tablets.

Viscosity: viscosity is the crude oil in the flow caused by the internal frictional resistance, crude oil viscosity depends on temperature, pressure, dissolved gas and its chemical composition.

High viscosity pump can match the relief valve, when the pump and piping system overpressure, safety valve is opened, the formation of internal reflux, ensure the safety of the system.