Abstract: The internal depressurization of thermoformed containers (C) is performed by means of the secondary suction circuit of a Venturi meter or ejector (15), the primary circuit of which is passed through by compressed air at pressure values regulated by a proportional valve (19) controlled by an electronic control unit (10) which detects the internal pressure or vacuum of the containers by means of a transducer (9) which is programmed by means of a special apparatus (11) and which, upon reaching of the predetermined vacuum inside the containers, activates means (Z) for closing the end portion of the said thermoformed containers.

Abstract: The parisons (P) manufactured by an extrusion group (1,1″) are gripped between the mould and the counter-mould (S,S′) mounted, together with the associated actuating mechanisms, on a carriage (19) which, after receiving the parisons, moves into a blowing station (Z1) for the formation of the bottles which then remain suspended from the nozzles of this station. By means of a set of three self-centring closing and opening grippers (P1, P2, P3), the groups of bottles are then transferred from the said blowing station to a sprue-removal and mouth-calibrating station (Z2), to a quality control station (Z3) and then to a filling station (Z4). By means of a fourth self-centring gripper (P4) with an independent movement the filled bottles are finally transferred into an end capping station (Z5). A conveyor (59) which collects together and removes all the production waste is provided underneath the various work stations which are aligned with each other.