14 VALMET
Pulp Paper & Logistics
Durable and reliable performance from optimised dryer fabrics
New products to ensure that dryer fabrics remain durable and reliable, even under challenging conditions, have been developed by Valmet. These provide more economical solutions that match customers’ precise needs. PPL reports
is predictable and minimises the need for unplanned fabric changes. “Our customers appreciate easy
D
tail threading, good runnability, long life and low fabric cost – regardless of their machine or the paper grade. The high quality of our dryer fabrics comes from our expertise dating back over half a century, and the millions of square metres of fabrics produced,” says Juha Paavolainen, Valmet’s product technology manager. The largest product group in
Valmet’s portfolio of dryer fabrics is the double-warp polyester (PET) fabrics, named after the product name renewal called Valmet Dryer Fabric OR, OP and EOS.
Optimised for different operating conditions Factors limiting the running time of dryer fabrics include
urable and reliable dryer fabrics ensure that the paper- making process
hydrolysis, contamination, wear and damage. “Our PPS-reinforced dryer
fabrics are excellent for hydrolysis-prone positions,” says Paavolainen. “However, contamination and mechanical wear are sometimes even more crucial for the dryer fabric’s running time than hydrolysis, and for those challenges, we have developed a totally new material: MHR. It can withstand hydrolysis to a sufficient degree, but it measures notably higher in seam strength and loop elasticity than PPS. “The double-warp structure of our dryer fabrics lets us optimise them for different operating conditions, and our professionals ensure that customers get the best product for their needs. Right now, we’re studying even more hydrolysis-
resistant yarns to replace expensive PPS material, and it looks very promising,” says Paavolainen.
New products developed for recycled furnish Using recycled furnish with a high sticky content and consequent use of latest high-pressure cleaners has changed the requirements for dryer fabrics. Going forward, Valmet is developing new materials and products aimed at matching these requirements. “For example, our new Valmet
Dryer Fabric DG has a relatively open sheet side surface to prevent dirt bridging in between the yarn
knuckles, while the machine side is smooth for good sheet runnability,” explains Paavolainen. “Its unique weave pattern has been designed to improve the high-pressure cleaning effect by arranging weft yarns so that the water jet against the fabrics’ running direction is directed through the fabric. Valmet Dryer Fabric DG shares the double-warp structure and durable warp loop seam of other Valmet dryer fabrics
July/August 2018
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