Press roll covers for board and paper making

Improved machine runnability with press roll covers

Roll covers for pressing (earlier PressFox, PressJade, PressTaurus, PressRhino, PressKodiak)

Roll covers in the press section have a strong impact on production line efficiency, capacity and product quality. Along with press section clothing, they are key components for dewatering through the wet pressing process. Especially in center roll-based presses with an open draw, roll covers also directly affect machine runnability. The most important rolls in your machine deserve superior covers.

Reduced downtime

Increased production

Savings in energy consumption

Roll covers tailored for your unique needs

Valmet press roll covers range from economical rubber covers for less demanding applications, to the toughest roll covers providing the most eﬃcient dewatering technology. Covers can be designed for the unique needs of any application. Cover topography can be tailored for maximal dewatering, and non-felted rolls can have surfaces with release characteristics adjusted for the specific grade being produced.

Valmet offers soft press roll polyurethane covers for demanding process conditions such as LNP rolls and suction press rolls. They can operate under the highest loads and at the highest speeds – and still save energy and need less maintenance.

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For grades requiring more gentle nip pressures (e.g. to achieve bulk savings), soft but still extremely durable roll covers can be applied without sacrificing roll reliability and run period lengths.

Wet pressing in containerboard production

A key to higher energy efficiency, and often a significant enabler of a capacity increase, is optimal wet pressing performance. Increased nip dewatering improves drying capacity and increases sheet dryness, with a remarkable effect on energy costs. For example, increasing post-press dryness by 1.5 percent unit means savings of approximately €1.3 million in drying energy costs (case linerboard 400,000t/a).

CO₂reduction and energy savings for highly loaded press rolls

The latest PU press roll cover products like the Valmet Press Roll Cover PP and PK have a lower friction coefficient, thanks to intensive R&D work that has resulted in lower rotation resistance under high nip loads and thus a reduction in the press drive’s power consumption. Allowing for a 15% reduction of drive energy compared to typical rubber, CO₂ reduction -0.2 kg/t per roll.

Find optimal roll covers for every board and paper process

Explore our press roll cover products from interactive demo. By exploring this roll cover application tool you can easily see different cover options for every board and paper making process.

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Valmet roll cover development: Testing beyond limits

References and articles

From wet pressing to sustainability in Siam Kraft board mill

The redesign of the suction press roll cover has not only solved a persistent problem of shadow marking at Siam Kraft board mill. It has also helped the mill meet their goals for sustainability, cost-effectiveness and the circular economy by reducing fiber consumption.

Wet pressing performance much improved!

N R Agarwal has been able to reduce web breaks, increase speed and boost post-press dry content on its PM5 with Valmet’s Intelligent Roll Solutions for press efficiency.

Improving press performance step by step

After a fourphase improvement project, Thai Cane Paper enjoys lower steam consumption, better runnability, higher paper dryness, longer felt lifetimes, and vacuum energy savings in its PM 2 press section.

Vijay Anand Kraft Papers: Excellent ROI with Valmet Press Roll Cover PP

The Indian board-maker Vijay Anand has overcome the challenge of traditional rubber covers by upgrading with a Valmet roll cover. Press Roll Cover PP premium polyurethane covers have provided remarkable benefits with an outstanding payback from the investment.

Smoothing the way at Skoghall

One cleaning shutdown eliminated every six weeks at Stora Enso’s Skoghall board machine.

Making the right choices to boost wet pressing efficiency

Wet pressing has an impact all the way from paper machine drying capacity and web runnability to end product properties. The secret of process efficiency often lies in making the right choices for the press section consumables.

Save costs by optimizing water removal

Water removal at the forming or press section is significantly cheaper than at the dryer section. Since removing one liter of water from the sheet at the dryer section costs five times more than at the press section, it pays to optimize dewatering at an early stage.

Optimum press roll surface structures

Paper, board and tissue makers all have their own roll surface structures that they are used to having on their press section rolls. In many cases, those structures have been there from day one and may no longer be the most effective ones, taking into account advances in materials, felts and knowledge.