Valmet's hard nip calenders are well suited for final calendering of different types of board, newsprint, and fine papers. Another area of application is pre-calendering of coated paper and board. OptiCalender Hard calender can be applied to both new lines and rebuilds, all levels of the required accuracy of profile control without width or speed limitation . The streamlined design of OptiCalender Hard contributes to trouble-free hard calendering. Valmet's well-proven hard nip calendering technology is a result of experience from almost 200 references delivered.
OptiCalender Hard offers reliable hard calendering for the widest range of applications. Depending on the required profiling accuracy and heat levels, proper rolls and heating systems are selected in close cooperation with the customer. There are no speed or width limitations making OptiCalender the technology of choice also for the highest capacity lines. Fast and accurate CD profiling ensures that target paper quality is met, even in the most demanding applications. Ease of operation and maintenance linked with excellent paper or board quality and a long list of well-running references have made OptiCalender Hard the industry favorite.
Planned and instructed maintenance actions: Circuit drawings, assembly bill of materials and service intervals are part of OptiCalender Hard deliveries. Easy access is essential when maintaining the calender. The roll changes are fast and easy. Optional machine diagnostics give a big advantage in monitoring the calender condition.
High performance tail threading is a key element for high productivity of the paper or board machine. It is essential for a fast recovery in web break. With an optional break recovery package, adaptive software recovers all the process parameters prior to the break instantly, thus removes potential profile problems.
Understanding the fundamentals behind functional spreading of paper web is demanding and requires a long experience.
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.
The calender design ensures safe usage. 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.
When investing on a calender, it is impossible to know if the investment is suitable for the future markets after e.g. 5 years. Upgradeability of OptiCalender Hard eases the decision making. Fast and easy installation and start-up ensure saleable paper or board soon after start-up. Additionally, the trouble free calender is easy to operate. Local support will help the customer maintain the calender, e.g. with roll grinding.
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.
Former hard nip calenders OptiHard, ValHard and OptiHard Slim Line have been included in the OptiCalender family as OptiCalender Hard.
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.