Advanced Actuator Control Systems

VIB SteamTech ^FF Description
The most important properties of a good fourdrinier steamshower are its profiling capability and its ability to raise dry content into the first press. These two properties improve the sheet's cross-directional moisture profile and optimize the paper machine's productivity and runnability. With a VIB SteamTech ^FF in the forming section, controlling the moisture profile and average moisture level is possible.

Increasing the velocity of the steam jets onto the web eliminates the compromise between production increases and profiling capability. The VIB SteamTech ^FF has two steam sealing zones to keep steam under the box, providing maximum benefit with minimum steam leakage.

VIB SteamTech ^FF has a unique diffuser plate with varying spacing in the machine direction to make the profiler more efficient. The profiling zone is fully compartmentalized, supplying high velocity steam to each cross direction compartment via a separate, uniquely designed actuation valve that allows optimum zone definition and precise control. The proprietary design of the converging nozzles generates higher steam velocity to ensure greater steam condensation and thermal transfer into the paper web.

Primary material for VIB SteamTech ^FF is stainless steel 1.4571 (316 Ti). Special grade stainless steel 1.4539 (904 L) is used against highly corrosive wear at the diffuser plate, edge-heating zones and in pneumatic control lines. Optional Teflon coating is also available for the diffuser plate and edge heating zones for ease of cleaning.

Control Station ^ECS is a SteamTech electronic con-trol station that manages the control of the pneu-matic actuators. Each actuator is controlled with an I/P-converter with a control signal from 0.4 - 2 bar (6 - 30 psi). Setpoints are sent from the VIB control stationIPS using measurement system data.

Control Station ^IPS is an integrated process station that serves as the central process point for the system. It contains the integrated MD/CD control, the operator visualization package, PLC functions and the intelligence to manage the total actuator control system.

Benefits to the Paper Industry

• Increased production and flatter moisture profile can be achieved simultaneously.
  
• Narrow spacing of the actuator is application matched to produce the desired profiling effect.
  
• Optional feedback of the actuator position ensures reliable performance of the SteamTech Actuator.
  
• Provides better edge performance for improved reel building.
  
• CD moisture 2-sigma improvement of 50 %, profile correction of 2,5 %.
  
• Dryness increase of 1,5 - 2,5 % after suction roll.
  
• Production increase of 6 - 10 %.
  
• Improved runnability is achieved with a uniform web tension profile.
  
• Improved felt conditioning of the pick-up felt.
  
• Efficiency increase of total production line with integrated moisture control of 1 - 2 %.
  
  

Technical Features Three separate zones in the machine direction. Integrated CD and MD control including PLC functionalities (interlocks, loops). Profiling zone spacing down to 50 mm means high profiling capability. Rigid construction, material 316 Ti. LAN or Serial Link protocol for connection to the measurement system. Switchable with a mouse click.	Technical Specifications Pneumatic Actuator Body material 1.4404 Control signal 0.4 - 2 bar (6 - 30 psi) Position indicator Closed when no control signal Stainless Steel Primary 1.4571 (316 Ti) 1.4539 (904 L) used for high corrosive areas (diffuser plate, edge heaters, control lines)
Options Teflon coating for diffuser plate and edge heaters Removable diffuser plate Steam supply engineering PosiTrak position feedback Turnkey installation	PSF® - Precision Steam Finishing VIB SteamTech FF Fourdrinier Flat Steamshower VIB SteamTechTAD Through Air Drying Steamshower VIB SteamTechTC Tissue Steamshower VIB SteamTechSC Press Section Steamshower VIB SteamTechTFF Teflon Flat Felt Heating Steamshower