When recycling scrap cables, copper purity directly determines the resale value of the recovered material. Two of the most common machines used in cable recycling equipment are cable stripping machines and cable granulators. While both are designed to separate copper from plastic insulation, they achieve very different results in terms of final copper purity. Understanding these differences is essential for any recycling business looking to maximize profitability.
How Cable Stripping Machines Achieve Copper Purity
A scrap cable stripper equipment works by physically cutting and peeling away the plastic or rubber insulation from the outside of a cable, leaving the inner copper wire intact. Because the copper conductor is recovered as a whole piece without being crushed or shredded, the resulting material is essentially clean bare copper.
The purity level from a stripping machine typically ranges between 98% and 100%. The only potential contaminants are tiny residues of insulation adhesive or slight oxidation on the surface of the wire, both of which have minimal impact on overall purity. Since the copper remains in its original form, smelters and metal buyers generally classify stripped copper as high-grade material, commanding premium market prices.
However, stripping machines have clear material limitations. They perform best on thick, single-core power cables with rigid insulation. Fine multi-strand wires, flexible cables, mixed wire bundles, and armored cables are difficult or impossible to strip efficiently. Attempting to process unsuitable materials often leads to incomplete stripping, which can reduce effective purity and increase manual sorting work.
How Cable Granulators Achieve Copper Purity
A cable wire granulator takes a completely different approach. Instead of peeling the cable, it shreds and grinds the entire material into small particles. The mixed granules then pass through a separation system that sorts copper from plastic based on differences in density, size, and electrostatic properties.
The copper purity from a granulator depends heavily on the type of separation technology used. Dry separation systems equipped with air classifiers and vibrating screens typically achieve copper purity between 95% and 99%. Wet separation systems, which use water to separate materials based on specific gravity, can push purity closer to 99% or slightly above under optimal conditions.
Because the copper is crushed into small granules rather than recovered as intact wire, there is a higher risk of cross-contamination. Small plastic fragments may remain mixed with the copper output, especially if the separation system is not finely tuned or if the feed material contains complex multi-layer insulation. Additionally, the increased surface area of granulated copper makes it more susceptible to oxidation during storage, which can slightly reduce its perceived purity over time.
Side-by-Side Comparison of Copper Purity
| Factor | Cable Stripping Machine | Cable Granulator |
|---|---|---|
| Copper Purity | 98% - 100% | 95% - 99%+ |
| Copper Form | Intact wire strands | Small granules or powder |
| Main Contaminants | Minimal insulation residue | Possible plastic fragments, oxidation |
| Market Grade | High-grade bare copper | Copper granules (slightly lower value) |
| Best Material Types | Thick, single-core cables | Mixed, multi-core, thin wires |
Which Machine Should You Choose?
If your highest priority is achieving the absolute maximum copper purity and you mainly process thick, uniform cables such as building wire or industrial power cables, a stripping machine is the better choice. The intact copper wire it produces sells at a higher price per kilogram, and the simple mechanical process keeps operating costs low.
On the other hand, if your operation handles a wide variety of cable types, including thin electronic wires, automotive cables, and mixed bundles, a granulator offers far greater versatility. While the copper purity may be slightly lower than stripped wire, the ability to process materials that would otherwise be unsellable often results in higher overall recovery and revenue.
Many established recycling plants use both technologies in combination. They strip thick, high-value cables to capture premium-grade copper, then feed the remaining thin and mixed wires into a granulator to ensure nothing goes to waste. This dual-system approach balances maximum purity with maximum material coverage.
San Lan's Cable Recycling Solutions
San Lan Technologies Co., Ltd offers a comprehensive range of cable recycling equipment designed to match different operational needs and purity requirements.
For operators focused on high-purity copper recovery from thick cables, our scrap cable stripper equipment includes models such as the D01-6B, D01-8A, and D01-8B, capable of handling cable diameters from 1.5mm up to 150mm. These machines deliver clean, intact copper wire ready for direct sale to smelters.
For facilities processing mixed or fine wire materials, our cable wire granulator series includes the WCD-200C, WCD-600S, and WCD-1200S models. These granulators use advanced dry separation technology to achieve high copper recovery rates while processing a wide range of cable types continuously.
With over 15 years of experience in e-waste recycling machinery, San Lan provides not only equipment but also complete plant design, installation, commissioning, and after-sales support. Our technical team can help you analyze your incoming material stream and recommend the optimal machine configuration to achieve your target copper purity and production capacity.
Conclusion
In the debate between cable stripping machines and granulators, copper purity is only one factor to consider. Stripping machines generally produce higher purity copper in the form of intact wire strands, making them ideal for thick, uniform cables. Granulators offer slightly lower but still excellent purity levels, with the major advantage of handling virtually any cable type including those that cannot be stripped.
The best choice depends on your specific material mix, volume, and business model. For personalized guidance on selecting the right cable recycling equipment for your operation, contact San Lan Technologies. Our engineers will help you build a system that delivers the purity, capacity, and profitability your business demands.
