| Position | Typical usage time |
|---|---|
| Press section | 4 to 6 years |
| Wire section | 4 to 6 years |
| Slitter/Rewinder | 4 to 6 years |
| Calender fly roll | 4 to 6 years |
| Calender spreader roll | 4 to 6 years |
The maximum maintenance interval for Original by Finbow spreader rolls (with 2,000 m/sec. processing speed) is over ten years.
Finbow rolls increase the quality of every meter
Finbow's patented advanced solutions increase the service life of the roll and can increase the maintenance interval by years. Every Finbow roll solution is designed using the Finite Element Analysis (FEA) technology and is manufactured in accordance with the requirements of the position based on the initial analysis.
Among the things considered
in the design of the roll are the following:
- The web width and the frame of the machine
- The type of paper being manufactured
- The running speed range (maximum and minimum speeds)
- Critical vibration speeds
- The position and direction of the arc height
- The actual operating temperature (does not always correspond to the designed temperature)
- Diameter limitations, if any
- The bracket solutions
Based on the exact analysis of the position and related needs, we can design a cost-efficient roll solution that meets the requirements of the position:
- Coating solutions
- Bearing solutions
- Spool material solutions
- Bracket solutions
- Adjustment brackets with a direction indicator and handwheel
- Our direction indicator reliably indicates the bow direction. The manually operated adjustment wheel is a cost-efficient solution for positions where continuous adjustment is not necessary and the adjustments can be made safely.
- Flexible metal-reinforced Finbow coupling between the segments
- Our clutch keeps moisture and impurities on the outside of the roll, where they should be. The flexible clutch enables a level of tightness that cannot be achieved when using other solutions.
- Patented bearing protection
- Regardless of careful assembly and efficient protection, rust flakes, for example, can be created inside the roll. The efficient internal protection keeps these away from the bearing. Why use both braces and a belt? Because we want to be absolutely certain that our customers' processes are not disturbed by anything.
- Long-life grease selected to suit the environment
- Selecting the lubrication grease to suit the environment is crucial. The usage time will not be long if the grease is unsuitable for its purpose. We have reached usage times of more than ten years with processing speeds of up to 2,000 m/min.
- Coupling installation secured with a sealant
- In critical environments, we will seal coupling and spool using SikaFlex sealant. This is made possible by the flexible structure of our couplings.
- Adjustable threading pulley
- The direction of the pulley can be adjusted to keep the rope in its place.
- Bidirectional sealing of the ends
- Even if the grease feed to the end sealing were to be disturbed, the bidirectional (radial and axial) sealing maintains the sealing.
- Drive options
- We select the use of the roll according to the customer's process.
- Timing belt: our customers increasingly require solutions that use timing belts.
- V belt: Traditional V belt.
- W belt: V belt with two grooves.
- Metal ball bearing
- The single-row metal ball bearing with deep grooves is a good solution for most situations. In bearing deliveries, we cooperate particularly with FAG and SKF. With the increasing amount of copies on the market, we always ensure that our bearings are authentic brand products. Unless otherwise separately agreed, our bearings are always new instead of reconditioned units. If requested by the customer, we can also arrange bearings from other suppliers.
- Ceramic ball bearing for demanding positions
- As the width and processing speed of machines increase, they require increasing durability from bearings. Hybrid bearings with ceramic balls increase the usage time by lengthening the maintenance intervals. Despite the somewhat higher initial cost, the ceramic ball bearings are extremely cost-efficient, particularly in demanding environments.
- Spool material
- Spool material is carefully selected to suit the processing environment perfectly.
- Acid-resistant steel is the best option for corrosive environments.
- Carbon steel suits dry environments and, with a proper coating, can even be a cost-efficient option for wet environments.
- Spool coating options
- Hard chrome plating is a traditional solution that is wear- and corrosion-resistant.
- Teflon carbide is particularly well suited for environments vulnerable to dirt.
- Nano-polymer carbide is a new generation coating that exceeds the wear-resistance of chrome, and stays just as clean as a Teflon coating.
- Black nitration is a traditional corrosion prevention system for carbon steel spools and brackets.
- If necessary, we can also deliver Teflon sleeves for the rolls that we service through subcontracting.
- We also have several years of experience in servicing rolls with rubber cover. We buy the rubber covers through our subcontractor network.
- Drying system for the air inside the roll
- Due to changes in temperature, water is condensed inside the roll during downtime, unless our drying system is installed. As the air inside the roll cools, it is compressed, creating low pressure inside the roll. Our tight rolls do not allow air to enter between the segments, meaning that we are able to arrange for make-up air through the drying system. The result is a controlled climate where corrosion is not a problem.
- Revival lubrication system
- On request, we can also deliver lubrication systems that add oil to a continuously lubricated bearing. Where knowledge and experience on continuous lubrication is available, we do not usually recommend installing this quite expensive system.
- Vibration sensors for the condition monitoring system
- We install the sensors according to the requirements of the customer's system: Sensodec, SKF, etc.
- Turning mechanism for the bracket with an electric motor
- In some cases, occupational safety and the frequency of adjustments require a remotely controlled roll turning motor to be installed on our bracket.
