- Complete pulp mills
- Chemical pulping
- Wood handling
- Cooking and fiber line
- Pulp drying
-
Chemical recovery
- Evaporators
- Recovery boilers
- White liquor plant
- Process support and optimization
- Rebuilds and upgrades
- Heat and power production
- Services for chemical recovery
- Air emission control
- New value-adding processes
- Dissolving pulping
- Mechanical pulping
- Recycled fiber
-
Automation for pulp
- Distributed control systems
- Quality control systems
- Analyzers and measurements
-
APC Advanced Process Controls
- Valmet WinGEMS
- Valmet Debarking Optimizer
- Valmet Batch Cooking Optimizer
- Valmet Continuous Cooking Optimizer
- Valmet Washing Line Optimizer
- Valmet Oxygen Stage Optimizer
- Valmet Bleaching Optimizer
- Valmet Evaporation Optimizer
- Valmet Recovery Boiler Optimizer
- Valmet Recovery Boiler Leak Detector
- Valmet Recovery Boiler Sootblowing Optimizer
- Valmet Causticizing Optimizer
- Valmet Lime Kiln Optimizer
- Valmet Recovery Line Management
- Mill information management
- Boiler Diagnostics Systems
- Services for pulp
- Fiber Technology Center
- Pulp references
- Pulp news and stories
- Pulp
- Mechanical pulping
- Chip washing
- Screw drainer
Screw drainer
A screw drainer is designed to drain the circulating wash water from the washed chips prior to entering the impregnation or primary refining system.
Each screw lifts the chips up to an inclined screen that separates sand, sawdust, bark particles and water from the forward moving chips. Flushing water is added at the top to rinse any remaining sand from the chips that are successively dewatered in the upper zone of the drainer.
The screw drainer consists of a housing with chip/water inlet, chip outlet, a screen around the screw and a water outlet. The screw shafts are equipped with replaceable shaft ends, journaled by grease-lubricated bearings. Each shaft is driven by an AC-motor via a shaft mounted gear reducer.