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Debarking

The debarking process, resulting in logs of the best possible cleanliness, is essential for any pulp, paper and fiberboard mill. The raw material is a major expenditure and therefore, the way the logs are debarked is important for the total economy of a mill.

Best possible cleanliness and economy with Valmet's debarking system

Valmet offers several debarking systems to cover the various needs depending on climate and different wood species. All debarking systems combine high capacity with easy and reliable operation and provide optimal bark removal with minimum wood loss. The design ensures effective bark separation from the logs prior to the chipping process.

Many wood species coming from forest plantations are difficult to debark, compared to easy-to-debark softwood which was the primary raw material only a couple of decades ago. For example, eucalyptus bark emerges in long strips and mainly follows the logs out of the debarking drum. For this reason, a special bark separation system after the drum is necessary.

Valmet debarking equipment

Drum debarkers

  • EasyTyre
  • EasyFloat
  • EasyRoll

Rotary debarker

  • EasyBarker

 

EasyTyre

EasyTyre is a rubber tire-supported barking drum which features an ideal support and drive system using heavy-duty standard rubber tires. This enables remarkably easy maintenance, which is as easy as changing the tires on a truck. The drum can be transported in pieces, which makes on-site assembly possible. The support design enables the use of the existing foundation when replacing any kind of barking drum. Optimized tire loads and location ensure a long service life and effective utilization of the drum shell. The elasticity of the rubber tires minimizes vibration and shock loads against the foundation and the drum shell.

EasyFloat

EasyFloat is a hydrostatically supported barking drum. High reliability of the drum is guaranteed by hydrostatic support bearings enabling high static and dynamic loads. Thanks to an ingenious supporting system with an oil film between the support ring and the bearing shoes there is no mechanical contact and no wear in the supporting system. The large drum size enables high capacity debarking in a single line. This feature minimizes total investment cost.

EasyRoll

EasyRoll is a multi-roller supported barking drum. High reliability of the drum is guaranteed by an ingenious multi-roller supporting system balancing high static and dynamic loads. The large drum size enables high capacity debarking in a single line. This feature minimizes total investment costs.

EasyBarker

The EasyBarker is designed to ensure efficient bark removal in challenging conditions where bark removal using conventional drum technology is difficult. It can be due to wood characteristics or cold climate without de-icing process, small diameter logs or crooked logs. Worldwide experience from the pulp, paper and panelboard industry and knowledge gathered over 60 years was capitalized in the development of the EasyBarker. This allows us to offer a long service life through a superior combination of reliability and low maintenance.

 

maintenance and shutdown management For debarking

Debarking Drum Wear Resistance Coating

Valmet VAL1 MX is an advanced ceramic composite to protect the debarking drum cell.

EasyTyre condition test

The debarking drum condition test provides information about the true condition of the machine.

     

Process and automation upgrades For Debarking

Soundtrap

Detects unknown particles in the material flow eg. stones, metal pieces and lumps of ice.

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