Aramid filament yarn provided with a conductive finish
A technology of aramid and filament yarns, applied in fiber processing, thin material processing, textile cables, etc., can solve the problems that cables do not have, low specific resistivity, unsuitable for elevator cable breakage detectors, etc.
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example 1
[0023] This example shows a process of applying a conductive organic substance (COS) to a wet yarn that has not been pre-dried in an operation integrated with the spinning process. Spinning masses are prepared by mixing concentrated (99.8 wt.%) snow sulfate and powdered polyparaphenylene terephthalamide. The spinning material is de-aired, heated to 90°C in a twin-screw extruder, and supplied to a spinneret via a filter and a spinning pump. The spinneret has 1000 spinnerets with a diameter of 59 microns. The spinning material is extruded through the spinning hole, and then successively passes through an air belt with a length of 8 mm and a coagulation bath (spinning bath). The bath is a dilute solution of sulfuric acid and water (approximately 19% by weight) at a temperature of 5°C. The filament bundle thus formed passes through a neutralization bath containing a dilute sodium carbonate solution and a washing bath successively, and the filaments are thoroughly rinsed with water at ...
example 2
[0037] This example shows the process of applying a finishing agent containing a conductive organic substance (COS) to the dried yarn in an operation integrated with the spinning process. The spinning material in Example 1 was extruded through a spinneret with 2000 spin holes with a diameter of 59 microns, and then passed through the same air belt, coagulation bath, neutralization bath, and flushing as described in Example 1. Take a bath. Excessively adhered water is removed by means of a pair of extrusion rolls. Then, the yarn passes through a series of 3 drying drums (6 rolls, 160°C; 6 rolls, 180°C; 4 rolls, 250°C). The yarn is in contact with the surface of the drum for a total of approximately 7 seconds. Then, by means of a liquid applicator and a supply pump, the fully dried filament bundle is provided with an aqueous finishing agent containing COS. Then, the yarn passes through a conveying drum (4 rolls about 20°C) and winds into a roll at a speed of 300m / min. The linear den...
example 3
[0046] This example shows the application of a finish containing conductive organic substances (COS) to a dried yarn that is not directly connected to the spinning process. Commercially available Twaron(R) 2200 (1610 dtex / f1000) yarn is subjected to the following treatment. The yarn roll is rotated and unrolled while the yarn passes through a liquid applicator one after another, passes through a steam box (temperature 240°C, staying for 8 seconds), and finally winds into a roll at a speed of 75m / min. Using a liquid applicator and a supply pump, the yarn is coated with the finishing agents mentioned in Tables E and F. The following process conditions change:
[0047] a) Composition of finishing agent containing COS
[0048] b) The amount of COS on the yarn
[0049] c) Concentration of finishing agent solution
[0050] Table E Aqueous finishing agents containing conductive organic substances
[0051]
Concentration of finishing agent (wt.%)
Finishing agent component co...
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