Cradle Debarker

In a cradle debarker, logs are loaded into a long trough that contains a series of horizontal and vertical conveyor chains, which are oriented at a slight angle to the path of the logs. The chains lift and drop the logs as they move along the trough. This action loosens and removes bark via compressive and shear forces that are generated between the logs in the trough.

Using the cradle debarker over other debarking methods can reduce energy consumption. Cradle debarker also inflicts less damage to the logs, leading to a greater wood recovery rate, decreased transportation costs through elimination of off-site debarking, and greater process control (Kramer et al., 2009., p.88).

Development Status Products
Commercial
Pulp, Paper

Cradle DebarkerCosts & Benefits

Parent Process: Virgin Material Preparation
Energy Savings Potential

US flag A cradle debarker consumes 33% less energy than other debarking methods (Kramer et al., 2009. p.88).
Energy savings are estimated at 0.025 GJ/t of debarked logs (Marin et al., 2000. p. 22)

CO2 Emission Reduction Potential

US flag Emissions reductions are estimated at 2.93 kg CO2/t-wood (Martin, et al., 2000. p.21).

Costs

US flag Investments are estimated at US $25.8/t-wood pulp [based on US $ value in 2000] (Martin et al., 2000. p.22)

US flag

 A cradle debarker can reduce costs upto $33/t-wood (Kramer et al., 2009. p.88).

Cradle Debarker Publications

Page Number: 

88