How to choose the right copper wire granulator capacity
Buyers usually start with a throughput figure — 100 kg/h, 300 kg/h, 600 kg/h — and work backwards. That is the wrong direction. Capacity is an output of three decisions you make before you ever look at a model table: what cable you can source, how many hours you can realistically run, and who buys the granules.
Start with the cable mix, not the tonnage
A granulator rated at 300 kg/h will not process 300 kg/h of thin communication cable. Thin, multi-strand and heavily insulated cable slows the feed and produces a lower copper yield per kilo, because there is simply less metal in the input. Automotive harness and household wire behave differently again.
Before sizing, sort a representative sample by type and estimate the copper content. If your supply is mostly thin mixed cable, choose a model one step above your nominal target, or budget for a pre-sorting step. This single assessment does more for payback than any specification on the brochure.
Work out realistic running hours
A machine is only as productive as the hours it actually runs. Small operations usually find that sourcing, pre-sorting and selling consume more time than granulating does. If you can realistically feed the machine for four hours a day, a 600 kg/h unit is wasted capital — the same output comes from a 200 kg/h unit running a full shift.
The exception is where you buy cable in batches. If material arrives in container loads you need capacity to clear a batch before the next one lands, and the constraint is storage, not daily throughput.
Match the model to your power supply
This is the most common practical blocker. The 30–60 kg/h entry model runs on 220 V single phase, which means it can go into a workshop or garage without a supply upgrade. From roughly 150 kg/h upward the machines need three-phase industrial power, and the largest models draw 42 kW — a supply and cabling project in its own right.
Check the available supply before selecting a model. A machine that cannot be powered on site is not a bargain at any price.
Purity is where the money is
Two machines with identical capacity can produce very different revenue if one delivers 97% copper and the other delivers 99.9%. Buyers of granules — refineries and traders — price against purity, and a few points of plastic contamination change the acceptance category.
Dry separation systems reach up to 99.9% purity with a 99% sorting rate on suitable feed. Ask for a material test on your own cable before committing, and check the output rather than the datasheet.
Do not ignore the plastic fraction
Granulation produces two saleable streams, not one. The plastic insulation fraction has a market of its own in many regions, and having a buyer lined up for it changes the economics of the whole operation. If there is no local market, plan for storage and transport — it is still a cost you carry.
What to take away
- Size from your cable mix and realistic running hours, not from a target tonnage.
- Confirm the site power supply before choosing a model — single phase versus three phase decides the shortlist.
- Test your own cable for output purity; the number that matters is the granule quality, not the rated capacity.
- Account for the plastic fraction as a cost or a revenue line, not as waste that disappears.
Written by the Miracle Machinery engineering team. Figures quoted are from published equipment specifications; project-specific results are confirmed by material test.