Dosage device for continuously extruding and applying a spacer profile of an insulating glazing unit

A dosage device for extruding a monocomponent or bicomponent polymeric product, for an automatic machine for forming a spacer frame, said dosage device comprising:

• a first dosage assembly and a separate second dosage assembly configured for dosage and feeding of said product, and a controller configured to communicate with an operator interface disposed on a control post, said controller being configured to activate the first dosage assembly and the second dosage assembly alternately such that one of the first dosage assembly and the second dosage assembly is configured to provide continuity of flow to an extrusion nozzle while the other of the first dosage assembly and the second dosage assembly is configured to reload, said first and second dosage assemblies being activatable and dispensed, simultaneously, jointly, and complimentary wherein said controller is configured to activate the first dosage assembly and the second dosage assembly such that one of the first dosage assembly and the second dosage assembly includes a flow-rate ramp that passes from a steady-state value to zero and the other of the first dosage assembly and the second dosage assembly is complimentary such that the other of the first dosage assembly and the second dosage assembly includes a flow-rate ramp that passes from zero to the steady-state value, wherein each one of said first dosage assembly or said second dosage assembly that is taking over is configured to align its own pressure with the pressure of said dosage assembly that is quitting, by means of actuations of synchronous electric motors provided with feedback by first and second pressure transducers arranged individually downstream of said first and second dosage assemblies and separated from said first and second dosage assemblies and said first and second pressure transducers are each arranged upstream at least one valve, the at least one valve being configured to swap the dosage assemblies, wherein the at least one valve is a three-way valve and/or a two-way valve and/or a one-way valve type, wherein the first pressure transducer monitors the pressure of the first dosage assembly and the second pressure transducer monitors the pressure of the second dosage assembly.