Optimizing Controls

Achieve fewer sheet breaks, improved product uniformity, faster grade changes and higher production with superior process optimization.

Types of control

Headbox Control
Headbox Control can be applied to a wide range of headbox types and wet end process configurations. Its unique design allows users to easily modify headbox control strategies as they adjust the process, without requiring expensive software upgrades. Operators can enter the desired targets in familiar units such as jet-to-wire ratio, rush/drag ratio, rush/drag percent, or rush/drag differences 

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Coordinated Speed Change Control
This control features an operator interface that provides information about all the supervisory and regulatory loops, including the status of the individual actuator ramps. By making this control easy to use, utilization will be higher than with conventional systems, leading to fewer sheet breaks, less downtime and an overall increase in average speed and production. 

Speed Optimization Control
This feature builds upon all the advanced capabilities of the Coordinated Speed Change package. Instead of merely calculating the maximum feasible speed for the given conditions, the system will continuously increase the machine speed until a constraint is reached.

Automatic Grade Change Control
The Automatic Grade Change Control package minimizes lost profit potential by making grade changes fast and precise without operator intervention. This package provides a predictive setup feature, which models the desired grade change before it is attempted. 

Stock and Ply Loading
Stock and Ply Loading provides distribution of stock flow feedback and feedforward corrections to multiple stock flow actuators feeding one or more formers or headboxes, allowing for individual stock types and status. Also provides feedforward control to the stock flows for redistribution of ply weights, entered as basis targets or percentages of total dry fiber flow. The optional Stock Initialization module allows coordinated ramping of individual stock flows to new targets based on desired speed and basis weight targets, typically used when starting up or performing a manual grade change.

Consistency Compensation
ABB's Consistency Compensation allows operators of the Ply Loading and Multiple Dry Stock Flow Control features increased flexibility in determining the actual consistency measurement. Operators can choose from using the actual instrument reading, the reading plus a calculated bias, or a constant reference consistency value determined by the lab. The ABB Consistency Compensation feature also allows modes, bias values, and reference values to be changed online.

Crepe Ratio Control
Crepe Ratio Control adjusts the yankee-to-reel speed ratio to maintain the desired amount of crepe. This results in improved bulk, caliper, and softness of the sheet. 

Bulk Compensation
This allows you to adjust the crepe ratio target based on operator entered bulk variation trajectory to improve reel building.

Yankee/Hood Control
Dynamic Yankee/Hood Control maximizes speed-of-response to moisture variations while maintaining the desired drying balance between the hood temperature and yankee steam pressure.

Additional resources

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Why ABB?
  • Automatic adjustments based on process changes
  • Industry-leading quality control
  • Deep pulp and paper, digital and automation expertise 

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