Pulp Paper & Logistics


FEATURE 23 VALMET


OptiRunner’s two separate yarn systems keep the fabric running for a clearly longer time. Although the machine side streak wears off (right), the sheet side remains intact (below).


Less downtime and stronger seams With a caliper of 1.5 mm, OptiRunner is also thinner and lighter than its predecessors, making it easier to install. OptiRunner’s durable structure also means less downtime and fewer unplanned shutdowns. Paavolainen explains: “We put a lot of effort into the seamability of the fabric, since the point of discontinuity is always the weakest link in dryer fabrics. In OptiRunner, this area has been rimmed so that the warp loom seam structure is stronger when in contact with mechanical seals.”


Savings potential in improved efficiency Paavolainen says that what is even cleverer about the double warp system is its high contact area. Other suppliers’ fabrics can guarantee a total contact area of 30 to 40 per cent whereas OptiRunner adds up to 51 per cent. This significantly improves drying efficiency. “Both sides have similarly low air


carry surfaces,” says Paavolainen. “This results in improved sheet control and reduced total fan energy costs, because less air is carried into the blow box pocket area.”


As the drive power demand


is lower, total annual energy savings are claimed to add up to €100,000 on a six- or seven- metre-wide machine. “In relation to other sections, the potential for dryer fabric savings is huge,” Paavolainen notes.


January/February 2016


Developed for the customer When developing OptiRunner, quality and safety were key factors. “We use durable, non- toxic yarns. When choosing


Valmet, our customers get a high- quality product and our expertise at their disposal,” Paavolainen says.


In the end, customers want their dryer fabrics to simply run without


problems. “All our innovations are based on customer needs. Special attention has been paid to easy installability, reduced energy consumption and maximized running times,” Paavolainen says.


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