Author: Xrido Group
Technical review: Xrido Engineering Team
Published: Aug 19, 2026
Updated: Sep 4, 2026
Quick answer
Mobile shredder capacity cannot be read off a nameplate: it depends on material density and size, feed consistency, screen opening and operator skill. Estimate from bulk density times realistic volumetric throughput, then confirm with a material test at the manufacturer.
Key takeaways
- Capacity varies enormously by material — light bulky wood and dense scrap behave completely differently.
- A practical estimate combines bulk density of the feed with conservative volumetric throughput.
- Screen size, cutter condition and steady feeding all change the real-world rate.
- Only a test with your actual material gives a number you can plan a business on.
Buyers ask "how many tonnes per hour?" as if it were a fixed property of the machine. In practice the same shredder can run at very different rates on different materials and screens. Estimating capacity honestly protects your business case.
What actually determines throughput
- Material type and density — light, bulky material fills the chamber by volume but adds weight slowly; dense material loads quickly but strains the drive.
- Feed size and consistency — oversized pieces stall the machine; a steady, well-sized feed keeps the shafts working.
- Screen opening — larger openings let material exit faster; fine screens recirculate material and cut the rate.
- Cutter condition — worn tools cut slower and hotter. See the maintenance checklist.
- Operator and loading machine — a skilled operator feeding consistently is often the single biggest factor.
A practical estimation method
When no test data exists, use this conservative approach:
- Measure or estimate the bulk density of your loose feed material in tonnes per cubic metre. Published bulk density ranges exist for common materials like loose wood scrap, light ferrous scrap and mixed C&D waste.
- Estimate the volumetric throughput the shredder can realistically move with your loading pattern — your supplier can provide reference figures for comparable installations.
- Multiply density by volume, then apply a conservative efficiency factor for real-world feeding interruptions, difficult pieces and screen changes.
- Sanity-check the result against how many trailer loads your site actually receives per day.
The estimate is a planning tool, not a promise. Two sites running identical machines routinely report different averages for exactly these reasons.
Why catalog numbers differ from your reality
Manufacturer capacity figures usually reference an ideal or specific material under controlled feeding. Your material mix, contamination level and loading logistics will differ. Treat catalog figures as an upper reference, not an expectation.
Get certainty with a material test
Before committing, ask the supplier to shred a representative sample of your material — ideally at their facility or on a reference site. Watch the test yourself: note the loading pattern, how the machine handles difficult pieces, and what the discharged material looks like. A written test report is the only capacity number worth building a business case on.
Xrido can review your material description and target capacity — reach us through the contact page.
Frequently asked questions
Do manufacturers publish capacity figures?
They publish reference figures for specific materials under controlled conditions. Real-world rates differ with feed size, screen and operator, so treat them as upper references.
How much does capacity drop with a finer screen?
It can drop substantially because material recirculates until it is small enough to pass. Weigh the finer output requirement against the throughput you need.
What is the fastest way to increase throughput?
Often better feeding: a correctly sized loading machine, a hopper kept consistently full, and removing oversize pieces before they enter the chamber.
Sources
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