Spinneret for multi-row coaxial spunbond and/or melt-blown type plant

Spinneret (1) for multi-row coaxial spunbond and/or melt-blown type plant developing along a main axis (la) and a main plane (1b), defining a vertical axis (1c) perpendicular to said main axis (la) and said main plane (1b) and comprising:

• a plurality of acceleration conduits (2) each extending along its own dispensing axis (2a) transverse to said main plane (1b) and each adapted to dispense a respective polymeric filament along said dispensing axis (2a);
• a plate (7) including:
• first holes (70) adapted to house said acceleration conduits (2), and
• second holes (71) separated with respect to the first holes (70) and adapted to allow the passage of air or gas;
• a mask (8) adjacent to said plate (7) along said vertical axis (la), including a plurality of third holes (80) centered with respect to said first holes (70), in fluid passage connection with said second holes (71) and adapted to house part of said acceleration conduits (2) and to allow, at the same time, the passage of said air or gas;
• and characterized in that
• said second holes (71) are distributed around at least part of said first holes (70) and more than four in number, around each respective said first hole (70), and
• for each said first hole (70) all said second holes (71) are distributed around said first hole (70) distributed exclusively along a circumference (7a) developing parallel to said main plane (1b) around a respective said first hole (70) without touching any other said first hole (70).