Fishing Net Shredder Machine: Hoe nylon- en PP/PE-visnetten efficiënt te versnipperen voor recycling

Afgedankte visnetten – vaak aangeduid als ghost nets – bestaan hoofdzakelijk uit nylon (PA) : PVC softens at approximately 200°C, while PET remains stable up to 260°C. By heating the plastic mixture on a rotating conveyor belt to 180-200°C, the PVC adheres to the belt, while PET remains unaffected and is collected in a separate container. A stationary blade then scrapes the PVC off. This method is cost-effective and efficient for separating the two plastics. polyolefinen (PP/PE). Deze materialen zijn technisch goed recyclebaar, mits zij correct worden verwerkt. Deze gids is opgesteld vanuit het perspectief van kopers en operators en richt zich op hoe : PVC softens at approximately 200°C, while PET remains stable up to 260°C. By heating the plastic mixture on a rotating conveyor belt to 180-200°C, the PVC adheres to the belt, while PET remains unaffected and is collected in a separate container. A stationary blade then scrapes the PVC off. This method is cost-effective and efficient for separating the two plastics. waarom gespecialiseerde shredders nodig zijn, welke configuraties in de praktijk werken en hoe een stabiel recyclingproces kan worden opgezet.

1. Zoekintentie begrijpen: wat zoekt de gebruiker werkelijk?

Gebruikers die zoeken op “fishing net shredder machine” willen doorgaans:

• Machines evalueren voor het recyclen van nylon of PP/PE visnetten
• Begrijpen hoe verstrengelde, flexibele netten efficiënt kunnen worden versnipperd
• Verschillende machine-types en capaciteiten vergelijken
• Bepalen of versnippering geschikt is als voorbereiding op verdere recycling of pelletiseren

Dit is geen puur informatieve zoekopdracht, maar een technisch-commerciële beslissingsfase. Daarom ligt de focus in deze gids op praktische toepasbaarheid en industriële realiteit.

2. Waarom visnetten moeilijk te versnipperen zijn

Visnetten gedragen zich fundamenteel anders dan starre kunststoffen.

Materiaaluitdagingen

• Very high tensile strength (especially with nylon PA6 / PA66)
• Flexible and elastic structure
• High chance of wrapping around the rotor
• Often contaminated with salt, sand, algae and organic material

Standard plastic grinding mills are not suitable for this, as they:

• Stalling due to entanglement
• Cause motor overload
• Cannot achieve a controlled cut

Conclusion: netting requires special designed shredders, no conventional plastic crushers.

3. Suitable shredder types for nylon and PP/PE netting

Single-shaft shredder (most recommended)

Suitable for: nylon, PP and PE netting (dry or pre-washed)

Key features:

• Low rotor speed, high torque
• Hydraulic or electric pusher
• Anti-wrapping cut geometry
• Replaceable screen (usually 20–60 mm)

Why effective:
The low speed prevents heat buildup and limits wrapping, while the high torque tears the material instead of pulling it.

Double-shaft shredder (pre-shredding)

Suitable for: large bundles of netting, ropes and mixed marine waste

Benefits:

• Very robust with irregular feed
• Opens and loosens entangled netting
• Ideal as the first step

Limitations:

• Irregular output size
• Usually requires a second shredding step

4. Recommended industrial processing line

Typical process layout:

1. Manual or conveyor belt feed
2. Primary shredding (enkelas shredder)
   • Output size: 30–50 mm
3. Washing and rinsing (strongly recommended)
4. Dewatering and drying
5. Optional secondary reduction
6. Pelletizing or compounding

This setup supports high-quality material recycling, including applications with higher requirements for quality and consistency.

5. Critical technical parameters for machine selection

Rotor and knives

• Large rotor diameter (≥400 mm)
• Intermittent knife pattern
• Wear-resistant tool steel (e.g., SKD11 or equivalent)

Drive

• High-torque reduction gearbox
• Motor power usually 30–75 kW
• Overload protection is essential

Throughput capacity

Actual capacity depends on net thickness, moisture content, and contamination.

6. Can shredded fishing nets be pelletized?

Yes, provided they are properly prepared.

Nylon (PA) nets

• Thorough washing and drying is required
• Sensitive to moisture (hydrolysis)
• Suitable for single- or twin-screw extrusion

PP / PE nets

• Easier to process
• Less moisture-sensitive
• Widely used in non-food applications

Important: The quality of shredding directly determines pellet quality and economic feasibility.

7. Environmental and regulatory considerations

Recycling fishing nets offers proven benefits:

• Reduction of marine plastic pollution
• Support for circular economy goals
• Recovery of valuable polymers
• Improvement of ESG and sustainability reporting

A correctly chosen shredder is the critical first step.

8. Common mistakes in purchase

• Use of high-speed mills instead of low-speed shredders
• Underestimation of material behavior
• Not accounting for salt and sand
• Purchase of standalone machines without line integration

9. Executive Summary

For recycling of nylon and PP/PE fishing nets is needed:

• A wet grinding and granulating machine is essential for professional recyclers aiming for high-quality end products from contaminated plastic streams. Unlike standard dry grinding, this technology integrates an intensive washing process directly into the cutting chamber. This not only results in efficient size reduction but also produces cleaner 'flakes' ready for further processing right away. specially designed fishing net shredder
• Low speed, high torque
• Proven anti-entanglement technology
• Integration into a complete recycling line

Shredding is not only volume reduction, but determines the stability, scalability and profitability of the entire recycling process.