Aramid filament yarn provided with a conductive finish
The invention pertains to an aramid filament yarn provided with a finish comprising >1.5 wt. % of an organic substance with a conductivity of >4 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., having a specific electric resistance of the yarn <2.5·10 4 Ohm·cm, and to a method of making said yarn. Further, the invention pertains to the use of said finish for making conductive cables, particularly for making elevator cables.
1. An aramid filament yarn provided with a finish comprising >1.5 wt. % of an organic substance with a conductivity of >4 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., the yarn with the finish having a specific electric resistance of <2.5·10 4 Ohm·cm.
2. The aramid filament yarn of claim 1 provided with a finish comprising >2 wt. % of an organic substance with a conductivity of >30 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., the yarn with the finish having a specific electric resistance of <2·10 3 Ohm·cm.
3. The aramid filament yarn of claim 1 provided with a finish comprising >2 wt. % of an organic substance with a conductivity of >41 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., the yarn with the finish having a specific electric resistance of <10 3 Ohm·cm.
4. A method of making the yarn of claim 1 , comprising bringing a solution of an organic substance onto the aramid yarn such as to obtain >1.5 wt. % of the substance relative to a total weight of the yarn without the finish, wherein the organic substance has a conductivity of >4 mS/cm, measured as a 50 wt. % finish composition in water at 20° C.
5. The aramid filament yarn of claim 1 , wherein the yarn transports electric current.
6. The aramid filament yarn of claim 5 , wherein the yarn transports electric current in aramid-containing material.
7. The aramid filament yarn of claim 5 , wherein the yarn is incorporated into an elevator cable.
8. The aramid filament yarn of claim 5 , wherein the yarn is incorporated into an elevator cable consisting essentially of aramid yarn.
9. A cable consisting essentially of aramid yarn and at least one aramid filament yarn provided with a finish comprising >1.5 wt. % of an organic substance with a conductivity of >4 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., the at least one aramid filament yarn with the finish having a specific electric resistance of <2.5·10 4 Ohm·cm.
10. The cable of claim 9 , wherein the cable is an elevator cable.
11. The aramid filament yarn of claim 2 provided with a finish comprising >2 wt. % of an organic substance with a conductivity of >41 mS/cm, measured as a 50 wt. % finish composition in water at 20° C., the yarn with the finish having a specific electric resistance of <10 3 Ohm·cm.
12. The aramid filament yarn of claim 2 , wherein the yarn transports electric current.
13. The aramid filament yarn of claim 12 , wherein the yarn transports electric current in aramid-containing material.
14. The aramid filament yarn of claim 12 , wherein the yarn is incorporated into an elevator cable.
15. The aramid filament yarn of claim 12 , wherein the yarn is incorporated into an elevator cable consisting essentially of aramid yarn.
16. The aramid filament yarn of claim 3 , wherein the yarn transports electric current.
17. The aramid filament yarn of claim 16 , wherein the yarn transports electric current in aramid-containing material.
18. The aramid filament yarn of claim 16 , wherein the yarn is incorporated into an elevator cable.
19. The aramid filament yarn of claim 16 , wherein the yarn is incorporated into an elevator cable consisting essentially of aramid yarn.