Plant for producing non-woven fabric

A plant for producing non-woven fabric, the plant comprising:

• a support structure (2) provided with a main channel (3), which is extended, along a vertical axis (Y), from an upper inlet mouth (4) for the introduction of filaments (F) for forming a non-woven fabric, to a lower outlet mouth (5) for the expulsion of said filaments (F);
• a cooling station (8), which is placed along said main channel (3) below said inlet mouth (4) and defines, in said main channel (3), a cooling chamber (9), which comprises:
• a first cooling section (10) extended along said vertical axis (Y) and provided with a first feed opening (11),
• a second cooling section (12) extended along said vertical axis (Y), provided with a second feed opening (13) and placed below said first cooling section (10);
• a cooling system (14), which is in fluid connection with said cooling chamber (9) by means of said first feed opening (11) and said second feed opening (13), and is configured for introducing, into said cooling chamber (9), at least one cooling gas for cooling said filaments (F) susceptible of traversing said cooling chamber (9),
• wherein said cooling system (14) comprises:
• a feed duct (16), extended between an inlet section (17) and an outlet section (18), wherein said outlet section (18) is placed in fluid connection with the first feed opening (11) of said first cooling section (10) and with the second feed opening (13) of said second cooling section (12);
• at least one heat exchanger (19) operatively connected to said feed duct (16) in order to vary the temperature of said cooling gas;
• at least one fan (20) operatively connected to the inlet section (17) of said feed duct (16) and configured for making said cooling gas flow through said heat exchanger (19) and through said feed duct (16) from said inlet section (17) towards said outlet section (18);
• a modulation system (23), which is placed to intercept said feed duct (16) between said inlet section (17) and said outlet section (18), and is configured for regulating the flow of said cooling gas;
• wherein said feed duct (16) is provided with at least one dividing structure (24) which divides said feed duct (16), at least at said outlet section (18), at least into a first sector (25), which is in fluid connection with the first feed opening (11) of the first cooling section (10) of said cooling chamber (9), and into a second sector (26), which is in fluid connection with the second feed opening (13) of the second cooling section (12) of said cooling chamber (9);
• wherein said modulation system (23) comprises:
• at least one first valve (27) placed to intercept the first sector (25) of said feed duct (16) and arranged for feeding the first feed opening (11) of said first cooling section (10) with a first flow of said cooling gas;
• at least one second valve (28) placed to intercept the second sector (26) of said feed duct (16) and arranged for feeding the second feed opening (13) of said second cooling section (12) with a second flow of said cooling gas;
• wherein said plant (1) comprises at least one pressure sensor (70), which is operatively associated with said cooling chamber (9), and is operatively connected to said fan (20) in order to control, in a feedback manner, said fan (20) in order to determine pressure in said cooling chamber (9).