SP-23-34 mechanized chipping of residues on the trail

Logs are chipped by a self-propelled chipper or a tractor-powered chipper, fed by a loader. Chips are blown into an integral bin, a bin trailer, towed by the same tractor or by an accompanying machine. The most effective team is that composed by a self-propelled chipper with integral loader and bin and a chip-shuttle (forwarder-based eg. Silvatec)

Functiogram

Advantages

May facilitate replanting in clearcuts
Reduction of fuel loads
Chips are very clean, as the wood is not dragged and contaminated
Machines can move on a brash mat

Limitations, thresholds

Nutrient removal
Possible small volume concentration
Low product quality
Low productivity of terrain chippers compared with roadside chippers
More terrain traffic with heavier units
The interface between chipper and chip-shuttle can cause substantial interaction delays

Main use

Nordic countries
Poplar plantations

Economic suitability

Example:

machine costs without personal costs: 120,00 Euro/h
personal costs per person: 35,00 Euro/h
number of persons: 2
in total: 190,00 Euro/h
regression line minutes pre tree
- b₀ = 0,2
- b₁ (tree volume) = 2,0
- b₂ (skidding distance) = 0,03