Member to increase the thickness and the creaminess of a beverage in a beverage producing machine

A method to prepare a foamy beverage in a beverage producing machine having a member comprising:

• a first body, which develops along a longitudinal axis and has, along said axis, a through hole, along which a beverage is fed from a percolation chamber arranged above;
• a second body, which develops along said axis under said first body and is supported by said first body;
• a third body, which, through elastic return means, is suited to stop the beverage flow between an end section of said hole and the inside of said second body, until the beverage reaches, inside said hole, a pressure value that is suited to overcome said means, thus allowing the beverage to flow towards the inside of said second body, said third body having its largest diameter that is 1 to 20% larger than the diameter of at least one part of the end section of said hole;
• a fourth body, which houses, on the inside, the lower part of said first body and said second body, and defines, on the inside, a chamber under said second body;
• at least one first through window, which is defined in said second body under the area in which said third body stops the beverage flow, thus preventing it from flowing from said hole to the inside of said second body;
• and
• a second through window made in said fourth body, which, during the inflow of the beverage from said percolation chamber, allows the beverage to come into contact with the air and, after the inflow of the beverage from said percolation chamber has ended, is suited to feed the beverage from said chamber towards the outside;
• wherein, inside said fourth body, in correspondence to said second window, a swirling motion of the beverage is created as well as a contact between the beverage and the air on the outside of said second window, which causes the beverage to become foamy.