Web Stabilizer to improve runnability and efficiency in a free-standing press
Web stabilizers, pocket ventilation and machine geometry modifications eliminate runnability problems efficiently and are often required to ensure fluent paper making process in the press and dryer sections. These maintenance free solutions have a huge impact on drying and energy costs.
Web Stabilizer to support the sheet from the press to the drying section
Maximum draw reduction is achieved with AirCurtain for center roll sheet release.
Benefits:
- Excellent runnability
- No mechanical contact between the stabilizer and the press felt / drying fabric
- Easy and safe tail threading
- Draw reduction between the press and dryer section
- Reduced number of breaks and defects
- Better paper quality
- Increased speed potential
- More tolerance to process fluctuations
- Maintenance free construction due to no wearing parts
Solutions for the single felted section
EasyOne concept - Optimized web release with a special high vacuum area at the critical sheet release point between the upper cylinder and the vacuum roll.
The increased compressure energy requirement for the high release nozzles will be compensated by the cost savings: The reduced number of web breaks and the reduced time required for cleaning work and tail threading following the web break.
The negative pressure level required on the dryer fabric side of the opening nip is highly dependent on the production speed. The negative pressure must exceed the pressure on the paper run side, thus making the paper web to follow the fabric instead of the smooth cylinder surface.
High release nozzle technology of the EasyOne enables the required under pressure levels without edge or cross direction nozzles. Thus, there is no further need to blow hot supply air to the stabilizer saving a great deal of energy. Moreover, the construction is maintenance free enabling 100% efficiency without any service requirements to the web stabilizers. In addition to the reduced running costs, the development means lower investment costs for any traditional air system equipment or lay-out demands.
Benefits:
- Draw reduction typically between 15 - 40 %
- Possibility to reduce furnish quality
- Possibility to increase steam pressure without losing runnability
- Reduced porosity due to lower tension between the press and dryer section
- Increased sheet elongation
- Reduction in web breaks typically 20 - 60% compared to standard “low vacuum” stabilizers
- Easy ropeless tail threading and less widening breaks
- Significant cost savings in consumable costs due to no need for wear parts
Solutions for the double felted section
Web Stabilizer to support the sheet run and to ventilate the cylinder pocket
Reduced unsupported draw by 25 - 50% between the top and bottom dryers enables trouble free runnability and supported ropeless tail threading.
The stabilizer gives better drying capacity due to reduced pocket humidity levels and wider sheet wrap against the drying cylinders.
Significant energy saving is guaranteed with optimized pocket ventilation by decreasing the pocket humidity level, correcting the pocket moisture profiles and eliminating the need for over-drying.
The pocket ventilators are installed near the felt rolls blowing dry supply air in to the pockets.
Benefits:
- Improved sheet runnability and reduced break frequency due to supported sheet run
- Increased drying capacity due to better evaporation efficiency
- Improved final sheet moisture profile
- Shorter tail threading time
- Lower draws enabling usage of less expensive raw material
- Increased speed potential
- Maintenance free construction, no wearing parts
- No fabric contact or mechanical sealing
- Increased production capacity due to efficient pocket ventilation
- Better 2-sigma moisture profile
Paper Machine Runnability and Tail threading RunPro
Runnability orientated RunPro offers web stabilizing, machine geometry modifications and ropeless tail threading solutions to eliminate runnability problems and to ensure fluent paper making process.
Web stabilizing and tail threading solutions are safe, reliable and maintenance free resulting in significant benefits that are reflected in a minimal payback time.