Patent Document ID: 6019917
Application ID: 09029843
Patent Flag: 1

Claim One:
1. Method for controlling and regulating an injection moulding press of a polymeric material, said press being actuated by means adapted to exert on the material to be moulded an injection force, which essentially comprises a filling phase during which the material to be moulded is introduced in the mould, and a subsequent maintenance phase under pressure during which a determined pressure is applied to the material, the method comprising the following steps: establishing respective relations of correlation between the mass, and at least one of the dimensions, of a product moulded with at least certain operating parameters of the press, said operating parameters including the viscosity of the material in the mould, or a parameter correlated therewith, and either the pressure of the material in the mould, or the injection pressure generating the injection force; statistically processing the correlation relations, in order to define an analytical model expressing the mass and said dimension, of the moulded product as a function of said operating parameters; deriving from said analytical model a force control law which must be applied by the press to the material contained in the mould during the maintenance phase as a function of the pressure of the material in the mould, or of the injection pressure; measuring at each cycle of injection the operating parameters of the press; and controlling the maintenance force applied by the press to the material during the maintenance phase from said analytical model.