Method for manufacturing capsule series, and related capsule series

A method for manufacturing a capsule series (10), each capsule (10) comprising a liquid core (12) containing at least one first product and a gelled casing (14) completely encapsulating the core (12), the method comprising the following steps:

• separately conveying, in a double casing (32), a first liquid solution (36) containing the first product and a second liquid solution (40) containing a liquid polyelectrolyte able to gel ;
• forming, at the outlet (50) of the double casing (32), a series of drops (78), each drop (78) comprising a central core (80) formed from the first solution (36) and a peripheral film (82) formed from the second solution and completely covering the central core (80);
• immersing each drop (78) in a gelling solution (70) containing a reagent able to react with the polyelectrolyte of the film (82) to make it go from a liquid state to a gelled state and form the gelled casing (14), the central core (80) forming the liquid core (12), wherein the drops (78) formed by co-extrusion in the double casing (32) fall by gravity through a volume of air into the gelling solution (70);
• recovering the capsules (10) formed;
• wherein the second solution (40) contains at least one surfactant before the former contacts the first solution (36);
• and
• wherein the flow rate of the second solution (40) is comprised between 0.005 times and 0.2 times the flow rate of the first solution (36) at the outlet of the double casing (32).