It's fascinating to think: the principle of paper production has hardly changed over the course of two millennia – fibers are bloated in water, then the mass is drained and the fibers form a continuous fleece. The machines used for this process today often comprise technology that is more complex than, let’s say, that of a jumbo jet. And they need it. After all, the systems – which are up to 400 meters long and 12 meters wide – run on a round-the-clock basis virtually all year round. And at speeds of up to 2,000 meters per minute. .
This is quite a different scale from when paper used to be made by hand. With this level of capacity utilization, it is clear that downtimes and lengthy standstills in paper production are an absolute no-go. Every single component has to guarantee the reliability of production – likewise round the clock, and on 365 days in the year if possible. There is hardly a component that is more important in the paper industry than suction rolls – and therefore also the suction roll sealing strips installed inside them. These have to prevent the vacuum from escaping.
The ultimate Wefapress® solution: sealing strips made of FlexGuard
A significant product advantage is already revealed by the name – these strips are extremely flexible compared to previously used graphite strips. Flexibility here means that the risk of breakage with this material is reduced to almost zero. But the FlexGuard sealing strips also live up to their name during transport and assembly: they can be delivered up to a length of 12 meters – rolled up in a small box, which is highly practical. This simplifies handling and storage. And of course on the journey from the warehouse to the paper machine when a sealing strip has to be replaced.
After installation, FlexGuard sealing strips quickly adapt to a worn roll shell, thereby ensuring immediate sealing of the suction chamber without a long run--in period. If the water lubrication fails, FlexGuard sealing strips have excellent emergency running properties due to their high graphite content. Frictional heat generated on one side is quickly transferred to the material, preventing strip bending and uneven wear. Even sealing allows operation with very low contact pressure of the strips onto the suction roll shell. This increases the service life of the sealing strips while at the same time reducing the drive power required.
FlexGuard – the optimum solution for mechanical paper production
FlexGuard can be used to seal all suction rolls – whether in pulp, board, tissue or paper machines and regardless of the roll shell material. Simply get in touch with us!