22 VALMET
FEATURE
Pulp Paper & Logistics
Smartest dryer fabric on the market
A fabric newly developed by Valmet meets the more demanding needs of paper machine operation. PPL reports
fabrics have to support the smooth operation of the entire production line. Dryer fabrics also need to withstand high temperatures, high fabric wear risk caused by mechanical seals and rolls, as well as high- pressure cleaning up to 600 bars. OptiRunner dryer fabric
T
for single felted groups was developed with modern drying
January/February 2016
he demands placed on paper and board machine clothing are high, as the
sections and devices in mind. “It has a smart double warp
system to optimize efficiency and save more energy in one of the most energy- intensive applications of a paper machine,” explains Juha Paavolainen, Product Manager for Forming and Dryer Fabrics at Valmet.
A durable double warp system In the drying section, mechanical seals are placed
10-15 mm from the fabric, leading to a significant risk of abrasion. Modern seals are a vital energy-saving factor, but they require more durable dryer fabrics. “Durability has been the
cornerstone of OptiRunner development. Its smart structure works in harmony with modern blow boxes, and we’ve been able to bring additional energy savings and improved runnability to our customers,” says Paavolainen.
Maximizing running times The smart single-layer structure consists of two separate yarn systems – one on the paper side and one on the non-paper side. If one layer wears out, the other remains intact. The strength of the fabric is about 200 kN/m (approximately 1,100 PLI), making it extremely wear- and jam-resistant, with strong warp loop seams that can hold up to 50 kN/m. Compared to traditional fabrics, OptiRunner extends running times and fabric lifetime by an average of 15-30 per cent.
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