Wire and cable extrusion machine works
Copper Capillary Tube,Capillary Tubing,Air Conditioner Copper Capillary,Air Conditioning Capillary Tubing Suzhou Green New Material Technology Co., Ltd. , https://www.szgreenvip.com
October 11 07:16:45, 2025
The pressing process for round stranded conductors involves three vertical and four horizontal pressing stages. The 80% pressing pressure is applied to the main compaction, while the remaining 20% is distributed among four pressing wheels that help achieve a more rounded shape. Compared to non-compacted conductors, pressed conductors can reduce their outer diameter by 2% to 17%, and the fill factor (in regular twisting) increases from 75% to as high as 90%–93%. For sector-shaped stranded conductors with cross-sectional areas between 25–50 mm², only one vertical pressing is required. Conductors of 70 mm² and above are typically stranded and pressed in three layers. In mining control cables, the pressing sequence follows a vertical, horizontal, vertical pattern, achieving a volume of 85%. The second stage focuses on shaping both sides, and the third stage ensures proper shaping for mine cables, allowing the compacted fan-shaped conductor to reach a fill factor of 90%–93%.
**Comparison between pressed and non-compacted conductors:**
- **Process Characteristics:** Pressing improves efficiency, reduces material consumption, and ensures a more stable structure.
- **Electric Field Strength:** A uniform electric field is achieved, which helps prevent electrical stress concentration.
- **Flexibility:** There is a slight reduction in flexibility compared to non-compacted cables, especially in mining communication cables.
- **Material Usage:** The structural material is reduced, with plastic cables saving approximately 8% in material usage.
**Extrusion Process:**
An extruder operates by using a specially designed screw inside a heated rotating barrel. Plastic material is fed into the hopper, where it is gradually melted and uniformly plasticized. The molten plastic is then forced through a die, which shapes it into the desired form. This allows the production of continuous, shaped materials according to specific requirements.
**During the extrusion process, the plastic undergoes three key stages:**
1. **Plasticization Stage (Compression Stage):** This occurs within the barrel. As the screw rotates, the solid granular plastic is transformed into a viscous, melt-like state.
2. **Forming Stage:** This takes place in the machine head. The viscous fluid is pushed forward by the screw’s rotation and pressure, passing through the die to take on the desired shape. It's important to note that the die primarily serves a forming function rather than a shaping one.
3. **Setting Stage:** After exiting the die, the plastic enters a cooling tank where it solidifies into its final, rigid form. This stage ensures the plastic maintains its shape and structural integrity.
By optimizing these processes, manufacturers can enhance product performance, reduce waste, and improve overall production efficiency.