Yarns, fibres and filaments that can be fibrillated, method and device for their production

A device for producing splittable fibers, yarns, or filaments by a melt-spinning process using mutually incompatible polymers,

• wherein at least two polymers A, B are introduced into a spinning head (1) having a modular design composed of a first distribution plate (2) having alternating distribution channels (3) and openings (4) to a second distribution plate (5), the alternating distribution channels (6) of the second distribution plate (5) forming an angle of approximately 90° to the distribution channels (3) of the first distribution plate (2) and having openings (7) which supply polymer to a third distribution plate (8) and which represents the connection between the second distribution plate (5) and a first outlet plate (9) for the elementary fibers (16), the third distribution plate (8) having subdistribution channels (10) which extend over its entire thickness and the ends of which correspond to the number of outlet openings (11) for elementary fibers (16), which is followed by a fourth distribution plate (12) whose subdistribution channels (13) also extend over its entire thickness and allow a sheath to be produced on every second elementary fiber (16);
• this is then followed by a second outlet plate (14) in which the outlet openings (15) for the elementary fibers (16) are combined in groups in which the spacings between adjacent outlet openings (15) for the polymer A and polymer A which is sheathed with B are of approximately the same size and each communicates with a plate (17) having spinneret[s] (18) out of which the polymers emerge and are drawn to form splittable fibers, yarns, or filaments (19) by a downstream drawing device.