Calender roll covers for board and paper making

For optimum board or paper properties

Composite roll cover for calendering (earlier CalLeopard, CalJaguar, CalPanther)

Targeting long grinding intervals and smooth surface quality? Valmet’s calender roll covers provide longer service intervals and optimum paper or board properties. Besides providing better marking resistance, our calender covers allow much higher speeds and temperatures without damage than conventional alternatives. For paper and boardmakers these factors mean quality. Let Valmet help you to run with the most suitable cover for your calender.

Smooth surface for excellent board or paper quality

Wear and barring resistance for long grinding intervals and ease of maintenance

Durability for a long lifetime

Effect of roll covers on the paper properties in calender

At the calender the paper gets the finishing touch, finalizing it’s quality. The required paper properties are diverse, depending on the paper quality. Paper can be glossy or matt, most often it needs to be smooth, bulk must be saved or the paper needs to be densified, and always the profile should be uniform. Therefor the calender equipment is diverse, from hard nip calender to soft and matt calender, to super and multi-nip calender, and to the belt calender. The paper can be hard and abrasive, or soft and of low strength, and the operating conditions range from low to high load, hot to cool, and low to high speed.

More than

2 000

composite calender covers

sold in the last 10 years

Wide range of hard and soft covers for all calendering needs

Valmet caters to all these positions and requirements with an extensive range of hard and soft roll covers. A typical calender roll cover is a composite cover, and Valmet offers composite covers of different performance at economic, standard, and premium level. The right choice of cover ensures special performance such as e.g. barring resistance. For special bulk-saving calendering there is the durable polyurethane cover, while for extreme smoothness and long-lasting running there is the hard coating.

Questions about roll covers?

Answer a few questions and our roll experts will contact you shortly.

Find optimal roll covers for every board and paper process

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

Start exploring

References and articles

Dongguan City Taichang Paper PM3: Partnering with Valmet to usher in a new era of efficient production

At Dongguan City Taichang Paper Co., LTD’s modern paper machine line, PM3 utilizes cutting-edge production technology to manufacture high-quality kraft paper at a speed of 800 meters per minute. With the growing demands of production output, however, ensuring the efficient operation of paper machines has become a significant challenge for the mill. Dongguan City Taichang Paper has partnered with Valmet to address this. Together, they have successfully tackled of the operational issues by introdu...

Valmet’s new premium calender covers – the ultimate high performers

Wear and impact resistance, as well as reliability, are entering another level with two newcomers to the Valmet Calender Roll Cover CL product family. In addition to graphical papers, they are suitable for specialty papers, as well as container and packaging boards.

Valmet’s selection of calender roll covers: A result of extensive expertise

Few roll cover manufacturers can offer as wide a range of calender covers as Valmet can today. Most attention is paid to high-performance covers addressing difficult conditions in the calender, such as vibration and barring in high-speed online calenders. But many calenders also run without vibration issues, and when such “anti-barring” covers are not required, other properties become more important.

Enduring release paper calendering: A difficult cover life

When the going gets tough, the tough get going. Calendering release paper is one of the toughest jobs a calender cover can encounter. Valmet Calender Roll Cover CL-EC has proven it is up for it.

Effect of composite roll cover hardness on calendering

Every now and then the question arises of whether paper producers can improve end product quality by using softer composite covers in the calender section when dealing with bulky grade calendering, such as wood-free or liquid packaging board grades.

Valmet Calender Roll Cover CJ-S improves calendering result

Valmet Calender Roll Cover CJ-S is directed specifically at coated paper grades. It’s modern manufacturing and materials technology targets simultaneously both paper quality and cover durability.