AUTOMATIC DEVICE FOR OPTIMIZING DISTRIBUTION OF THE WEB ON THE FORMING BELT IN SPUNBOND SPINNING SYSTEMS

摘要

An automatic device for optimizing the distribution of the web on the 5 forming belt in spunbond spinning systems, particularly but not exclusively for producing polypropylene and polyester NWF, comprising actuation means (41) for gear pumps (8) for supplying respective spinnerets (9) from which filaments (5, 10) exit, the filaments being entrained by the air ejected by ejector means and being directed toward an apparatus (36) for distribution on the forming belt (7) of the movable-vane type (3); the actuation means (41) for the gear pumps (8) are independent for each spinneret (9); the distribution apparatus (36) with movable vanes (3) comprises rotation means (37) for the movable vanes (3) that are independent for each vane (3); means (35) for adjusting the supply pressure of air ejectors (6) from which the filaments (5) exit are associated with the ejector means; the automatic device (100) further comprising a programmable electronic management device (11) that is functionally connected to the rotation means (37) for the movable vanes (3), to the actuation means (41) for the gear pumps (8), and to the means (35) for adjusting the supply pressure.