Advanced Actuator Control Systems

VIB SteamTech ^TFF Description
The most important properties of a good steam actuator are its profiling capability and its ability to raise dry content. These two properties will improve the sheet's cross-directional moisture profile and optimize the paper machine's productivity and runability. With a VIB SteamTech ^TFF in the press section, managing the moisture profile and drying capacity becomes notably easier.

The compromise between production increases and profiling capability has been eliminated by increasing the velocity of the steam jets onto the web in two separate machine direction zones.

VIB SteamTech ^TFF has two zones 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 constant full width zone has higher steam velocity to ensure greater steam condensation on the paper web.

Additional boosting effect is created with a felt heating zone which increases the surface temperature of the felt to prevent heat losses when felt and paper are in contact.

Primary material for VIB SteamTech ^TFF 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. The VIB SteamTech ^TFF is Teflon coated on diffuser plate and edge heating zones for easy cleaning, especially in front of first press.

Control Station ^ECS is a VIB SteamTech electronic control station that manages the control of the pneumatic 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 can be defined based on the desired profiling effect.
  
• Optional feedback of the actuator position ensures reliable functioning of the VIB SteamTech Actuator.
  
• Provides better edge performance for improved reel building.
  
• CD moisture 2-sigma improvement of 50 %, profile correction of 3 %.
  
• Production increase of 6 - 10 %.
  
• Felt heating improves production increase further by 3 - 4 %.
  
• Dryness increase of 1,5 - 2,5 %.
  
• Improved runability is achieved with a uniform web tension profile.
  
• Efficiency increase of total production line with integrated moisture control of 1 - 2 %.
  
  

Technical Features Two separate zones in the machine direction. One separate felt heating zone. 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 Removable diffuser plate Steam supply engineering PosiTrak position feedback Turnkey installation	PSF® - Precision Steam Finishing VIB SteamTech FF Fourdrinier Flat Steamshower VIB SteamTech TAD Through Air Drying Steamshower VIB SteamTech TC Tissue Steamshower VIB SteamTech SC Press Section Steamshower VIB SteamTech TFF Teflon Flat Felt Heating Steamshower