For nylon cable ties filled with plastic, the following operating conditions are important in order to obtain satisfactory product quality:
1. Feed the nylon cable tie polymer and filler evenly and safely into the mixing section;
2. Effective exhaust in the melting zone;
3. Ensure that the nylon cable tie filler is completely wetted by the polymer melt;
4. Disperse the nylon cable tie filler well in the polymer melt while minimizing the heat and shear duration of the polymer matrix to avoid polymer decomposition.
In the early development period of engineering reusable nylon cable ties plastics, only single/twin screw extruders can be used to mix engineering plastics with low filling content. In order to meet the requirements for filler feeding under high-efficiency process conditions and achieve more accurate product processing, special screw kneaders must be used.
At present, these special screw kneaders have almost completely replaced general extruders. In most cases, co-rotating twin-screw machines are used in single-stage or two-stage mixing and special single-screw kneaders.
Therefore, it should be ensured that in each step of the processing process, the movement of the material is controllable, even in the case of high filling. In addition, in the specially designed mixing zone, while the filler is uniformly distributed and mixed, high shear force is also required to properly disperse and mix it. The filler for nylon cable ties depends on the end use of the product. The fillers commonly used by manufacturers of nylon cable ties, stainless steel cable ties, steel nail cords, and nylon cable ties include minerals such as calcium carbonate, talcum powder, mica, etc., and some organic matter such as wood flour, cellulose and cotton.