The unique OptiCalender Metal Belt features a long-nip calendering technique that provides boardmakers with a major quality and efficiency boost. The possibilities to increase profit with very high surface quality and decrease raw material cost with the increased bulk are evident.
Higher bulk = less raw material and increased profit
High end product quality with premium price
Easy to operate and maintain
The secret behind OptiCalender Metal Belt calender lies in two factors; an extremely long dwell time and the most effective plasticization. OptiCalender Metal belt’s dwell time is 4-15 times longer than with a shoe nip calender and 100 times longer than with a conventional soft nip calender. Effectively plasticized surfaces provide low surface roughness values, good printing quality and a low post-roughening tendency after calendering.
With OptiCalender Metal Belt, the traditional calendering nip has been replaced with a one-meter-long machine-direction calendering zone. The OptiCalender Metal Belt has a smooth, heated metal belt and a thermo roll that calenders both web sides simultaneously in one extended zone.
Metal belt calendering is the ultimate method for bulk saving. It allows significantly higher heat transfer and plasticization, resulting in extremely high bulk and stiffness. Thanks to its one-meter-long processing zone, superb printing quality is achieved while maintaining high strength properties. This enables raw material optimization with savings potential – as much as 10% higher potential than with a Yankee cylinder. Consequently, this generates substantial raw material savings and increases yield.
The numbers behind fast payback are hard to believe. The saving potential with production increase, raw material savings and bulk saving can be counted in millions. An article about Zhuhai S.E.Z. Hongta "How about saving millions?" clarifies these figures almost too hard to believe.
If you wish to get further information like technical specifications, need a quotation, or wish to discuss different solutions, fill in the contact form and our experts will contact you shortly.Contact our experts
In terms of surface properties, the formation scale smoothness is improved, resulting in extremely flat and smooth surfaces and enhanced visual appearance on both sides of the board. For converters, this means excellent printability and consistent ink setting, as well as a decreased tendency towards print mottling.
By using OptiCalender Metal Belt, the board surface quality is outstanding:
What more can you hope for? We invite you to carry out your calendering trials at Paper Technology Center. All calendering technologies can be tried out with your own paper or board.
Thanks to its simple and compact design, the OptiCalender Metal Belt is especially suitable for rebuilds. The calender provides 40 - 60 % more production by removing existing bottlenecks, such as the Yankee cylinder and wet stacks.
OptiCalender Metal Belt is easy to use. Linear load is the only control parameter that needs adjusting in the calendering process. Two-sidedness can be controlled with temperature. Also the operating window is large. The example in the figure below shows the comparison of coated board calendering (the quality level and bulkiness).
The calender maintenance is also easy because of the opening front. Additionally, the metal belt life time can reach even two years (see article about metal belt lifetime record).
Former ValZone metal belt calender has been included in the OptiCalender family as OptiCalender Metal Belt.
CMPC and Valmet in partnership: True shared journey
Strong partnerships are built on people. “We work as one team and have built many personal relationships over the years,” says Jorge Aldana, Director of Project and Industrial Development at CMPC Papeles. This is a story about people working together towards a common goal. CMPC Chile describes it as a strategic partnership with Valmet.
OptiCalender Metal Belt & R&D: Valmet’s Mika Viljanmaa receives Marcus Wallenberg Prize 2012
During a ceremony in Stockholm on October 1, 2012, the Swedish King, His Majesty Carl XVI Gustaf awarded the Marcus Wallenberg Prize 2012 to Mika Viljanmaa, Valmet, for his ground-breaking development of metal belt calendering technology.
How about saving millions? - Zhuhai S.E.Z. Hongta Reheng Paper
Paper and board makers have been focusing their attention on increasing their output in tonnes. A paper machine is not considered to be functioning well if its output in tonnes drops, even if this is due to improved bulk and reduced use of fibers. Environmental considerations and cost competition are forcing to rethink the processes. Boxes are not made of tonnes but board sheets.
The world is changing fast; the consumption of newsprint and printing paper is decreasing and the consumption of containerboards or cartonboards are increasing. An old paper machine can be updated with a grade conversion rebuild to produce more profitable products. Turn a new page for your paper machine with the help from Valmet.Discover more
Rebuilding a paper or board machine can improve the competitiveness of your business and your processes. But where do you start? Download our e-book to learn how to develop a winning rebuild concept, how to minimize rebuild related risks, and how to ensure smooth ramp up to full production.Download e-book
We offer the opportunity to experiment and develop paper and board products and processes without having to put your own production on hold. This is very cost-efficient compared to expensive tests in your own production. Follow the activities in the trials on site or remotely through live streaming cameras.Contact our pilot trial experts
Calender roll covers
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.
Five questions that will help maximize roll cover effectiveness
Roll cover decisions are complex; the prices, performance characteristics and cover lifetimes vary considerably. Answering these five questions can guide papermakers in making a better choice among today's wide range of roll cover technologies.
Doctoring affects machine runnability, paper and board quality, production costs, and production efficiency. Runnability can be improved by optimizing doctoring parameters and blade materials. Cleaner rolls result in better end-product quality. The blades can be selected to meet customers shutdown schedule which will lead to fewer blade changes resulting in lower blade costs. The reduction of unplanned shutdowns and costly downtime periods can be avoided by reliable and trouble-free doctoring.
A reliable tail threading process decreases tail threading times, minimizes waste and improves safety. This means an investment in your process is an investment that pays for itself. Whether you need improvements in paper or board machines, we have an advanced tail threading solution that clearly enhances your production efficiency. Our comprehensive range of tail threading services, from preventive maintenance to tail threading study secures optimal operation of your equipment and reduces threading times.