Spinning head and related apparatus for the production of filaments

Apparatus (1) for producing a nonwoven fabric comprising

• a spinneret (2) for extruding a plurality of filaments (3),
• a cooling device (4) arranged, in use, below the spinneret (2),
• a mechanical drawing device (5) arranged below the cooling device,
• a collecting device (6) to collect the filaments which is arranged below the drawing device (5), the drawing device (5) comprising at least two primary rollers (11, 12, 13) each rotatable about its own axis of rotation (A11, A12, A13), and one or more secondary rollers (21, 22), the secondary rollers (21, 22) each being rotatable about its own axis of rotation (A21, A22),
• a frame (50),
• wherein
• said primary rollers (11, 12, 13) and said secondary rollers (21, 22) are constrained to said frame (50) such that, considering a condition of use, said secondary rollers (21, 22) are movable with respect to said primary rollers (11, 12, 13) between a first position of operational disengagement from said filaments (3), and a second drawing position of said filaments (3), and
• wherein said primary rollers (11, 12, 13) and said secondary rollers (21, 22) are arranged alternately with each other, so that, in use, the filaments (3) alternately meet a primary roller and a secondary roller, and so that, in the second drawing position, the filaments (3) meet rollers arranged at progressively decreasing distances (D1, D2, D3, D4, D5) from the collecting device (6), the tangential speed of the roller (11) which is placed furthest upstream in the path of the filaments (3) being between 300 and 1500 m/min, the tangential speed of the rollers progressively increasing,
• wherein said primary rollers (11, 12, 13) are translationally integral with said frame (50) and said one or more of the secondary rollers is translationally constrained to said frame, by means of a slide, the translation of said slide defining said first and second positions.