A drum chipper, also known as a drum wood chipper, is a machine designed to process small-diameter wood, wood residues like twigs and branches, into wood chips typically measuring 3-5 cm in length and less than 5 mm in thickness. The cutting knives are mounted on a cylindrical drum, distinguishing it from disc chippers, which use a flat disc. This design is particularly effective for handling fibrous and bulky materials, making it a staple in forestry, landscaping, and biomass industries.
History Of Wood Chippers
The history of wood chippers began with Peter Jensen’s invention in 1884 in Germany, initially featuring a disk design. Heinrich Wigger’s 1922 patent further advanced disk-style chippers. Drum chippers, however, appear to have developed later, with a 1978 patent (US4077450A) for a rotary drum wastewood chipper indicating their presence by the mid-20th century. Bandit Industries introduced the Model 100 Brush Bandit in 1983, suggesting drum chippers were already in use but gaining prominence for their feed systems.
How Does a Drum Chipper Work
Drum chippers are powerful machines designed to transform branches, logs, and wood waste into uniform chips for various applications. These efficient devices have become essential tools in forestry, landscaping, and wood processing industries.
The Core Mechanism
At the heart of every drum chipper is a cylindrical steel drum with sharp blades mounted around its exterior. Unlike disc chippers, drum chippers connect the rotating drum directly to the power source—typically a gas or diesel engine—providing exceptional cutting power. This direct connection requires substantial energy but delivers superior performance for heavy-duty applications.
The operation begins when wood material enters the feed system. Most models use hydraulic feed rollers at the machine’s throat to control material flow. As the engine drives the drum through a system of pulleys and belts, the high-speed rotation creates the cutting action.
The Cutting Process
When wood contacts the rotating blades, they slice through the material against an anvil or stationary plate. Several factors determine the final chip size, including:
- Distance between the anvil and knives
- Spacing between blades on the drum
- Feed speed
- Drum rotation speed
Components Working Together
The drum chipper consists of several integrated parts:
- A welded steel base providing structural support
- The blade roller with 2-4 mounted cutting knives
- Upper and lower feeding mechanisms
- A hydraulic buffer system for handling different material thicknesses
- A discharge chute or conveyor for chip collection
Wood Chips Production and Discharge
After cutting, the wood chips fall through a screen that ensures proper sizing. Oversized pieces remain in the cutting chamber for further processing until they meet size requirements. Properly sized chips exit through the discharge chute, ready for collection or further processing.
Types and Variations of Drum Chipper
Drum chippers vary in design to meet diverse needs:
- Portable Models: Mounted on trailers or trucks, ideal for mobile operations like landscaping and tree care, often powered by gasoline or diesel engines.
- Stationary Models: Fixed installations in sawmills or biomass plants, suitable for continuous, high-volume processing, sometimes electric-powered.
- Power Sources: Include internal combustion engines (gasoline, diesel), electric motors, and PTO (Power Take-Off) from tractors, offering flexibility for different settings.
Capacities range from small units handling 6-inch branches to large industrial models processing logs over 20 inches, with manufacturers like Bandit offering models from 6-inch to 21-inch capacity.
Applications of Drum Chipper
The wood chips produced have wide-ranging uses:
- Mulch: Spread in gardens to retain moisture and suppress weeds, enhancing landscape aesthetics.
- Biomass Fuel: Burned in power plants for renewable energy, reducing reliance on fossil fuels.
- Pulp and Paper: Raw material for paper manufacturing, processed in digesters for pulp production.
- Particleboard and Fiberboard: Used in engineered wood products, supporting construction and furniture industries.
- Composting: Added to compost piles for carbon, aiding organic waste decomposition.
These applications highlight drum chippers’ role in waste reduction and resource utilization, with chips used in biological power plants and wood chip factories.
Advantages and Disadvantages
Compared to disc chippers, drum chippers offer:
- Larger Infeed Openings: Facilitate feeding bulky, crotchy material, reducing preparation time.
- Higher Throughput: Process large volumes quickly, with a natural suction effect minimizing manual effort.
- Better for Fibrous Materials: Excel at processing brush, limbs, and palm fronds, common in warmer climates.
- Less Trimming Required: Collapse limbs easier, enhancing efficiency.
Disc chippers, however, may produce finer, more uniform chips, suitable for specific aftermarket needs, and can throw chips further, aiding truck loading. They are often preferred for smaller operations due to lighter weight and lower power requirements. Discussions on forums like ArboristSite suggest drum chippers are faster for smaller straight stuff, while disc chippers handle bigger, irregular materials better.
Maintenance and Safety
Maintenance is crucial for longevity and efficiency:
- Knife Maintenance: Regularly sharpen or replace blades, with dual-edge designs (e.g., Vermeer) allowing flipping for extended use, reducing downtime.
- Lubrication: Grease drum bearings after use, especially when warm, to expel moisture and debris.
- Inspection: Check for wear on components, ensuring all parts meet safety standards.
Safety is paramount, given reports of 12 deaths in the US from wood chipper accidents. Precautions include:
- Never reaching into the feed chute while operating.
- Using push sticks for small pieces to avoid hand injuries.
- Ensuring safety guards are in place and functional.
- Providing operator training on safe procedures.
- Wearing PPE, such as gloves, eye protection, and hearing protection, to mitigate risks.
Top 6 Leading Brands of Drum Chipper
The market features several manufacturers, including:
- Bandit Industries: Known for models like the 1890 drum, offering 6-21 inch capacities .
- Vermeer Corporation: Offers models like BC1000XL to BC2100XL, with dual-edge knives for longevity.
- Morbark: Provides large-capacity drum chippers for industrial use.
- Carlton: Known for portable units in tree care.
- TCPEL: Offers carbon steel frame models, handling 230mm to 680mm feedstock .
- GEP ECOTECH: Focuses on horizontal structure with chain plate conveyors for heavy materials .
These brands cater to a range of needs, from small businesses to large industrial operations.
Cost and Investment
Costs vary widely:
- Small portable drum chippers may start at a few thousand dollars, suitable for landscaping.
- Large industrial models can exceed $100,000, designed for continuous high-volume processing.
Factors influencing cost include capacity, power source, and additional features like hydraulic systems. Businesses should assess their specific needs, considering return on investment through increased efficiency and reduced labor costs, ensuring the machine aligns with operational goals.
Environmental Impact
Drum chippers contribute to sustainability by converting wood waste into useful products, reducing landfill use. They facilitate recycling by producing mulch, biomass fuel, and compost additives, supporting renewable energy and waste management initiatives. This role is crucial in minimizing environmental impact and promoting circular economy principles.
Future Trends
The industry is evolving, with potential innovations including:
- Hybrid or electric-powered drum chippers for reduced emissions.
- Advanced blade technologies for longer life and better performance.
- Automated systems for enhanced safety and efficiency.
Manufacturers are likely to focus on improving energy efficiency, reducing noise, and integrating smart technologies, ensuring drum chippers remain competitive in sustainable wood processing.
Conclusion
Drum chippers are essential for efficient wood waste management, offering versatility across applications from landscaping to industrial manufacturing. Understanding their history, operation, and maintenance ensures optimal use, while their environmental benefits and evolving technology highlight their importance in modern sustainability efforts.