Series of capsules comprising at least one drop of internal phase in a drop of intermediate phase and manufacturing method thereof

A method for manufacturing a series of capsules, each capsule comprising a liquid core and a gelled shell completely encapsulating the liquid core, the method comprising of the following steps:

• separate conveying in a double wall of an intermediate phase intended to form the liquid core and a first solution containing a polyelectrolyte liquid capable of gelling intended for forming the gelled shell;
• forming at the outlet of the double wall of a series of liquid bodies including one drop of intermediate phase coated with a peripheral film formed by the first solution, the first solution containing at least one surfactant prior to its contact with the intermediate phase;
• detaching each liquid body away from the double wall and falling of each liquid body in a volume of air;
• immersing each liquid body into a gelling solution containing a reagent capable of reacting with the polyelectrolyte of the film in order to make it pass from a liquid state to a gelled state and thereby form the gelled shell;
• recovering the capsules formed with a ratio of the volume of the core to the volume of the shell being greater than 2;
• the method comprising a step of forming at least one internal macroscopic drop of one internal phase in the intermediate phase, each liquid body formed at the outlet of the double wall comprising one internal macroscopic drop of an internal phase disposed in the intermediate phase;
• wherein the intermediate phase is aqueous and the internal phase is oily.