Automatic paste container closure device

A device for automatically opening and closing a container for pastes, comprising a tubular body, deformable by compression, with a closed end and an open end, and dispenser head attached at the open end for dispensing the paste, in which the dispenser head includes a dispensing duct with an inlet orifice inside the tubular body and in communication with the paste contained within the tubular body and an outlet orifice in communication with an external environment, a plate-like element for opening and closing the outlet orifice capable of movement tangential to the outlet orifice between a closed position and a open position, a support arm for the plate-like element connected to the dispense head, and resilient means for biasing the plate-like element to the closed position, wherein the dispensing duct includes a first and a second portion with respective internal tubular surfaces, that first and second portions intersecting at an angle to form an intersection aperture, and a piston positioned in the first portion sealingly slidable axially along the inner surface of the first portion between a first position in which the piston completely covers the intersection aperture and a second position in which the piston leaves the intersection aperture at least partly open and in communication with the first portion, the piston being in engagement with the resilient biasing means for the plate-like element.