Method for controlling a system for metering / mixing a product having several components, a metering / mixing system, and an injection or extrusion apparatus comprising the same

摘要

A system includes a first pump feeding a first component into a mixer, and a second pump feeding a second component into the mixer. The movement of the piston of each pump can be reversed from a direction of suction and of expulsion of the volume of the pump to a direction of expulsion of the component and vice versa. A movement detector is associated with each pump and is connected to a controller programmed to trigger the reversal of a pump after having determined that the volume remaining in the pump is insufficient to ensure the predetermined metering ratio. The controller is programmed to provide the continuous feeding of the first component into the mixer through the operation of the system, and the intermittent feeding of the second component into the mixer in order to carry out cycles of feeding doses of the second component into the mixer.