Valmet’s multinip calender is used both in off-line and on-line applications. The OptiCalender Multinip loading principle makes it possible to load all nips with the same linear load, resulting in efficient plasticization of paper in the very first nips. Profiling performance is affected by the number of control zones on deflection compensated bottom and top rolls.
High end-product quality
Reliable operation and high efficiency
Easy operation and safe maintenance
Profitable and safe investment
The multinip calendering technology represents the spearhead calendering technology for the paper industry. This claim is backed by over 50 references sold. Valmet's innovative OptiCalender Multinip with two stacks enables calendering of top quality printing papers even at very high speeds. Together, OptiCalender Multinip and OptiCalender Multinip with two stacks are Valmet's unrivaled multinip calendering solutions meeting the needs of all paper grades.
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Wide range of process parameters gives more flexibility to produce different grades. The aimed quality level will be reached by combining the effect of temperature and linear load. It is possible to design the calender so that there is a space reservation to add rolls in the future. A partial nip mode is also a possibility.
Even profiles and desired surface quality can be reached with OptiCalender Multinip's accurate loading and even surface temperatures of thermo roll and stable temperature control of heating system. Also intermediate roll levers and profiling with deflection compensated rolls drives to high product quality.
Understanding the fundamentals behind functional spreading of paper web is demanding and requires a long experience.
High time-efficiency is a combination of many factors. High quality and durable components ensure e.g. that spare parts are available also in the future and the roll covers are of top quality. Thermo roll dimensioning according to FKM norms, i.e. thermo rolls dimensioned to withstand the process parameters. Comprehensive monitoring of calender systems and equipment minimizes unplanned shut-downs.
High performance tail threading is a key element for high productivity of the paper machine. Valmet has a large numbers of on-line multinip calender tail threading in both Valmet’s own and competitors calenders. Tail threading performance is developed continuously by running trials in tail threading pilot machine.
In off-line calender efficient splicing is a must. Both unwind and wind-up splicing sequences are automatic.
The multinip calenders are easy to access for maintenance. User-friendly automation provides real time info about the machine status. All information - including history – is easy to find. Functions are visualized symbols, whenever possible - No codes in error messages. User-friendly automation helps users recognize, diagnose, and recover from errors.
Planned and instructed maintenance actions
Designed for safe operation
Strong reference base tells its powerful story. Wide operating window and upgrade readiness are functions that make OptiCalender Multinip profitable also in the future. Process and equipment support is available to further improve your calendering process.
OptiCalender Multinip with two stacks calender was developed to meet the demands of high-speed calendering on top quality printing papers.
Former one-stack multinip calender OptiLoad and two-stack OptiLoad Twinline have been unified in the OptiCalender family as OptiCalender Multinip.
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Learn more about the services and automation solutions for calenders
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 threa...