D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/507
D01D 5/26 (2006.01) D01D 5/40 (2006.01)
Patent
CA 1044868
ABSTRACT OF THE DISCLOSURE A process for the manufacture of fibrids of a thermoplastic organic polymer material which comprises extruding strands of molten thermoplastic organic polymer material through orifices of die means/and introducing a propulsive jet of liquid flowing from a nozzle located in the center of said die means at a velocity of from 10 to 100 meters per second and flowing in the same direction as said strands with in a liquid-filled zone surrounding said orifices, passing said strands, the propulsive jet and entrained liquid immediately and directly into and through a tubular impulse exchange zone having a mean diameter of from 2 to 20 times the diameter of said nozzle of said propulsive jet and a length of from 2 to 30 times its hydraulic diameter to provide shear stresses acting on said strands within said impulse exchange zone, and causing said strands of thermoplastic organic polymer material to solidify by the cooling of said melt by said liquid and to be broken up into fibrids by said shear stresses within said impulse exchange zone. The invention also relates to an apparatus for carrying out the above process. This apparatus consists of a container filled with liquid, a nozzle for melt of said thermoplastic organic polymer material and which surrounds a nozzle or nozzles for the propulsive jet projecting parallel into said container and a tube having a diameter from 2 to 20 times the diameter of the nozzles for the propulsive jet and having a length from 2 to 30 times its hydraulic diameter, said tube being disposed at a short distance from the die orifi- ces coaxially with an imaginary extension of the axis of the die so that said tube can accommodate the propulsive jet and the extruded thermoplastic organic polymer material leaving said die orifices. The orifices for the molten plastics material comprise a circle of round nozzles disposed around a propulsive nozzle or in the form of arcuate slots disposed concentrically with said propulsive nozzle.
164617
Engler Peter
Kuerten Heribert
Nagel Otto
Sinn Richard
Weinle Werner
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