OptiPress Center – center roll based press section - is a reliable, well-known concept that combines close to 40 years of pressing technology experience with modern shoe press technology. With this solution, a shoe press replaces a roll just before the first open draw. The resulting boost in dryness thus fully benefits web runnability in the open draw. If necessary to meet end quality requirements, a center-roll based press can be followed by a separate roll press. In the containerboard production from recycled fiber, machines dedicated to high speeds and light basis weights can be equipped with an OptiPress Center pressing process.
High dryness and good moisture profiles
Compact design and easy to apply also in rebuilds
A reliable concept with numerous references
Added capacity potential in rebuilds
There are hundreds of outstanding Valmet OptiPress Center (formerly named as SymPress) press sections operating successfully around the world in paper and containerboard production machines – for new lines and rebuilds alike. Read more about some of these customer success stories here.
Transfer belt technology allows the draw between the press and dryer sections to be closed in center roll-based concepts, too. Less draw is required, and dryness and end product qualities, such as strength and porosity, improve. Rather than a transfer belt, it is also possible to use a smooth, heated metal belt that goes around the center roll and guide stretcher roll, This metal belt technology further improves press section performance, as the increased temperature of the paper web enhances dewatering in the press nip.
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Palm Aalen PM 5 – a sustainable investment for the next 50 years
Oct 19, 2022
PM 5 at the Papierfabrik Palm Aalen-Neukochen site in Germany is the world’s widest high-capacity containerboard line. It is an investment for the next 50 years and has been producing high-quality and sellable board since the start-up in July, 2021.
Superior quality paper after rebuild - Sappi Gratkorn PM 11
Sep 7, 2017
Sappi's Gratkorn mill rebuilt their PM11 to improve the printing paper quality. The rebuild concept was optimized for improved formation and printability and reduced two-sidedness and validated in the series of pilot trials at Valmet facilities.
More efficiency and runnability with new OptiPress
Oct 12, 2016
When the press section of Mondi’s Štêtí's PM5 was rebuilt, the mill had sellable sack kraft paper in just three days. With increased dryness resulting in better web runnability and less steam consumption, the mill is happy with the OptiPress concept and co-operation with Valmet
From paper to packaging - StoraEnso Varkaus PM3
May 17, 2016
In 2015, Stora Enso converted their existing paper machine In Varkaus Mill to produce linerboard to better meet the market need for renewable packaging. PM 3 is almost like a new machine now; a combination of brand new and good, well maintained trusted technology.
Looking for press felts and fabrics?
Valmet press felts are always tailor-made to the specifications of each individual paper machine and position: paper grade, furnish, speed, dimensions. With proven world class technology of press felts, the web transfers smoothly to drying section with high dry content and superior quality values.Read more
Planning a press section rebuild?
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
Looking for press roll covers?
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.Read more