01Plastic Waste
Shredding plastic packaging and bulky plastic waste ahead of recycling lines. Cutter thickness is selected for the target piece size.
Recycling and Waste ManagementShredder Systems – Twin-Shaft Industrial Shredders
PRO MAKINA · Twin-Shaft Industrial Shredder
- Principle
- Cutting and tearing
- Rotor arrangement
- Two counter-rotating shafts
- Speed
- Low speed, high torque
- Material
- Bulky and mixed waste
Overview
Shredding Bulky Materials by Cutting
In a shredder system, material is caught between hooked cutting discs on two shafts rotating towards each other at low speed, and is cut and torn. Unlike impact crushers, this design works by cutting rather than crushing or impact.
Disc thickness and hook geometry are the main factors determining output size. Geared motors driving the shafts provide high torque; reversing on jamming and overload protection are part of the design.
Shredders are used for pre-shredding bulky materials such as plastic, wood, pallets and mixed waste. Where a smaller and more uniform size is required, secondary shredding and screening are assessed together.
01Process Flow
Shredder Material Flow
The diagram shows the typical flow in which the shredder takes bulky material from the feed hopper, shreds it with cutting rotors and discharges it. Separation and screening are done by separate equipment.
Scroll horizontally to view the full diagram.
Material line
- 1
Material feeding: Bulky material is loaded into the feed hopper by conveyor or loader.
- 2
Catching and cutting: Hooked discs on counter-rotating shafts catch and cut the material.
- 3
Jam control: On overload the rotors reverse to clear the jam.
- 4
Discharge: Shredded material leaves at the bottom to a conveyor or next process.
Depending on the plant concept, shredded material goes to metal separation, screening or secondary shredding.
02Applications
Shredder Applications
01
02Wood and Pallet Waste
Breaking pallets and wood waste into pieces that can be handled and processed. Nails and metal increase cutter wear, so separation is planned alongside.
Recycling and Waste Management
03Mixed Waste and RDF Preparation
Pre-shredding mixed waste in sorting and refuse-derived fuel (RDF) preparation lines. Contaminant control is part of the design.
RDF Preparation Plant
03Design & Manufacturing
Custom Shredder Design and Manufacturing
PRO MAKINA engineers shredder systems around raw material type, feed size, target piece size and capacity. Shaft and disc arrangement, cutter geometry and material, drive and torque, feed hopper and overload protection are designed together.
- Twin-shaft cutting arrangement
- Replaceable cutting discs
- High-torque geared drive
- Jam and overload protection
Process Design Data
- 01
Raw Material
Material type, density, moisture and contaminant content.
- 02
Feed Size
Largest piece dimension and feeding method.
- 03
Target Piece
Required piece size and downstream process.
- 04
Rotor and Cutters
Number of shafts, disc thickness, hook geometry and cutter material.
- 05
Drive and Safety
Torque requirement, gearbox, reversing and cutter replacement.
Torque, power and capacity are defined from raw material tests and project data; no specific piece size is guaranteed.
04Gallery
Shredder Photo Gallery
05FAQ
Shredder FAQ
What is the difference between a shredder and a crusher?
Crushers reduce material by impact or compression. A shredder cuts and tears material with cutting discs on low-speed shafts, which suits bulky and fibrous materials.
What determines piece size?
Piece size is determined by disc thickness and hook geometry. Secondary shredding and screening may be needed for a smaller, more uniform size.
What happens on jamming?
When overload is detected, the shafts reverse to clear the jam. Motor and gearbox are protected against overload.
How are cutters replaced?
Cutting discs are replaceable; access suited to the housing and shaft arrangement is provided for maintenance.
What information is needed for a quotation?
Raw material type, largest piece dimension, contaminant content, target piece size and hourly capacity.
06Resources
Related Machines and Plants
RDF Preparation PlantsPlant concept for preparing refuse-derived fuel (RDF).Organic Waste Processing PlantsPlant solution from organic waste reception to product preparation.Primary Impact CrusherFirst-stage impact crushing with a blow bar rotor and aprons.Screening SystemsSeparating bulk material by particle size.
Related machine groups:Conveying SystemsScreening SystemsSilos & Feeding SystemsDust Collection Systems
Technical Quotation
Request a technical quotation for a shredder system
Share your raw material, feed size and target piece size, and we will define the shredder system together with you.
Information Needed for a Technical Quotation
- Raw material type
- Largest piece dimension
- Contaminant / metal content
- Target piece size
- Hourly capacity (t/h)
- Feeding and discharge arrangement