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US 2003/0189270 A1Published application
Method for producing synthetic threads from polymer mixtures
OwnerDietmar Wandel, Alexander Kleininventors
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OwnerDietmar Wandel, Alexander Kleininventors
Estimating the term…
The synthetic threads are produced from a polymer mixture consisting of polyamide as base polymer and at least one additive polymer, the polymer mixture being pressed through nozzle openings as polymer melt with extrusion speeds (s) in the range from 18 to 160 m/min. The filaments thus formed are cooled, combined to threads, drawn off and spooled by forming at least one thread spool. The content of additive polymer in the polymer mixture is not less than M wt-% and not more than 2.5 wt-%, where M is derived from 0.0001·v−0.4, where v is the draw-off speed of the thread, and v lies in the range from 4500 to 8000 m/min. The additive polymer is amorphous and virtually insoluble in the polymer melt. In the spooled thread, the additive polymer is present in the base polymer in a fibril structure, the ratio s:v lies in the range from 1:50 to 1:250. Upon spooling, the thread spool preferably has a weight of the spooled thread of at least 4 kg.
A process of producing synthetic threads from a polymer mixture which consists of a base polymer and at least one additive polymer, wherein the polymer mixture is pressed through nozzle openings as polymer melt with extrusion speeds (s) in the range from 18 to 160 m/min and the filaments thus formed are cooled, combined to threads, the threads are drawn off and spooled by forming at least one thread spool, characterized in that the base polymer is polyamide (PA), that the content of additive polymer in the polymer mixture is not less than M wt-% and not more than 2.5 wt-%, where M is derived from 0.0001·v−0.4, where v is the draw-off speed of the thread, and v lies in the range from 4500 to 8000 m/min, that the additive polymer is amorphous and virtually insoluble in the polymer melt, where the additive polymer in the spooled thread is present in the base polymer in a fibril structure, and that the ratio s:v lies in the range from 1:50 to 1:250.
Dependencies are inferred from the claim text.