Dual Shaft Cardboard Shredder Machine in Tunisia for 1-2cm Output
A Tunisian cardboard recycling operation ordered a dual shaft cardboard shredder machine (Model-400, single-motor compact frame) for processing used shipping cartons and corrugated board into 1-2 cm shredded stock.
This case documents the dual shaft shredder selection logic for cardboard, the dense-blade 1-2 cm output, the discharge ramp design, and the Mediterranean shipping route for Tunisian buyers.
Customer Background: Tunisian Cardboard Recycling Operation
A small-to-mid cardboard recycler in the greater Tunis area processes 3-4 tons of mixed corrugated cardboard per day, feeding the shredded output directly into a cardboard baler for 200-300 kg bales.
The SL-400 frame with 300 kg/h throughput matches the daily target without oversizing. A larger 600 or 800 dual-shaft shredder would deliver 800-1,500 kg/h, but at 4-6× the price and 50% higher power draw—the customer did not need that headroom.
Why a Dual Shaft Shredder Is the Right Design for Cardboard
For the Tunisian customer’s application—mixed double-wall corrugated boxes, single-wall cereal cartons, and packaging offcuts—the dual-shaft design offers three practical advantages:
- Tear, don’t slice: Hook blades grab the cardboard and pull it into the cutting gap. Slicing (single-shaft) would require a much higher motor to push a sharp blade through compressed corrugated layers; tearing (dual-shaft) uses 40-60% less energy per kg.
- Handles staples and tape: Real-world cardboard includes staples, plastic tape, and labels. The dual-shaft hook design bends staples flat and pulls them out of the cut stream rather than snagging on a bed screen (the failure point of single-shaft shredders on contaminated cardboard).
- Lower RPM, lower noise: 15-30 RPM shaft speed runs 60-70 dB, suitable for indoor Tunisian recycling yards near residential areas. Single-shaft shredders run 400-800 RPM and produce 85-95 dB, requiring outdoor siting and hearing protection.
The dual-shaft shredders produce irregular 1-2 cm strips, actually preferred because it compacts more tightly than uniform cubes.
What Are the Model-400 Cardboard Shredder Machine Specifications?
Specifications of the cardboard shredder machine for the Tunisian customer:
| Parámetro | Especificación |
|---|---|
| Modelo | Model-400 dual shaft cardboard shredder (single-motor compact frame) |
| Shaft configuration | Two counter-rotating shafts, 15-30 RPM, hook-blade design |
| potencia del motor | 11 kW (single motor + gearbox to both shafts) |
| Capacidad | 300 kg/h (cardboard) |
| Blade diameter | 200 mm |
| Grosor de la hoja | 20 mm |
| Material de la hoja | 9CrSi (silicon-chrome tool steel, HRC 55-58) |
| Knife quantity | 20 pieces (10 per shaft, dense interlocking arrangement) |
| Output size | 1-2 cm (customer-specified) |
| Net weight | 1,000 kg |
| Power supply | 380V / 50Hz / 3 fases |
| Drive configuration | Single motor + gearbox to both shafts (compact 400 frame) |
| Descargar | Gravity-fed discharge ramp (30-35° angle) |
Three specs matter for Tunisian site work: 11 kW (compatible with standard 3-phase Tunisian grid), 300 kg/h (matches 3-4 t/day intake), 1000 kg (one-ton forklift portable, fits 20GP container).
Why a 400 Frame (Single Motor) Instead of a 400+ Dual-Motor Model?
Both are dual shaft cardboard shredders, but the drive configuration differs. The 400 frame uses a single motor + gearbox to both shafts; the 400+ frame uses two motors (one per shaft). The split matters for buyers below 5 tons/day:
| Factor | Model-400 Dual Shaft (Single Motor) | Model-400+ Dual Shaft (Dual Motor) |
|---|---|---|
| Shaft configuration | 2 shafts, 1 motor + gearbox | 2 shafts, 2 dedicated motors |
| Motor configuration | 1 × 11 kW motor + gearbox | 2 × 7.5-11 kW motors (one per shaft) |
| Potencia total | 11 kW | 15-22 kW |
| Capacity (cardboard) | 300-400 kg/h | 500-800 kg/h |
| Power consumption per ton | ~36 kWh/ton | ~30 kWh/ton (but at higher throughput) |
| Peso | 1,000 kg | 1,400-1,800 kg |
| Huella | Compact (1.6 × 0.8 m) | Larger (2.0 × 1.0 m) |
| Best for | 3-5 t/day intake (Tunisian customer) | 8-15 t/day intake |
| Price tier | USD 4,500-6,500 | USD 8,000-12,000 |
For the Tunisian customer, the single-motor dual shaft cardboard shredder machine SL-400 frame hits the 3-4 t/day target at half the capital cost of the 400+ dual-motor. The gearbox-driven design is a proven 15-year-old platform; the dual-motor 400+ is a newer 5-year design optimized for high-throughput plants.
How Does a 1-2 cm Output Work? (Dense 20-Knife Dual Shaft Configuration)
The customer specified 1-2 cm output—fine enough to feed directly into a cardboard baler without secondary crushing, but not so fine that the machine becomes a grinder (which would overheat on cardboard dust).
The dual shaft cardboard shredder machine Model-400 achieves this through a dense 20-knife configuration: 10 hook blades on each of the two counter-rotating shafts, 200 mm diameter, arranged with tight spacing so the hooks interlock and produce a narrow cut gap on each rotation.
Why the Discharge Ramp Matters for Cardboard Shredding
Cardboard shredded to 1-2 cm is light and fluffy—often 30-40 kg per cubic meter. Without a discharge ramp, the shredded stock accumulates, forcing the operator to stop and clear the jam every 15-20 minutes. The 30-35° discharge ramp solves this by using gravity to slide the shredded stock out of the chamber and into a collection bin or onto a conveyor below.
The customer opted for the standard 30-35° ramp. The standard ramp keeps the unit footprint compact (1.6 × 0.8 m) and eliminates a moving part that could fail. For a 3-4 t/day Tunisian operation, the simple ramp is the right choice.
Shipping to Tunisia: Mediterranean Port Logistics
The unit ships from our factory in China to the customer’s recycling yard in greater Tunis via Mediterranean sea freight.
- Step 1 — Factory to export port: 1-2 days domestic trucking. Plywood case (3.5 m³, ~1,050 kg packed).
- Step 2 — Sea freight (Shanghai → Radès via Malta transshipment): 22-28 days. Direct call or transshipment via Malta or Algeciras depending on the carrier.
- Step 3 — Tunisian customs clearance: 3-5 days. The customer works with a local freight forwarder (typically based in Radès or La Goulette) for import duties and TVA (Tunisia’s 19% VAT).
- Step 4 — Inland delivery: Trucking from Radès to the recycling yard, typically 1-3 days depending on the exact location in Tunis, Sousse, or Sfax.
Total door-to-door transit: 28-40 days.
Order a Cardboard Shredder Machine for Your Recycling Operation
For a dual shaft cardboard shredder machine configured to your daily intake, output size, and grid voltage, contact our engineering team.
We ship globally on FOB, CIF, or DDP terms. Most quotes are returned within 24 hours.
If you want to know more about double shaft shredder for cardboard, please read: All-purpose Cardboard Box Shredder Machine
