PrimeRun web stabilization system

ANDRITZ PrimeRun web stabilizers enable a trouble-free paper run at reduced draw, even at high machine speeds. There are different modules and configurations to meet individual requirements.



The PrimeRun web stabilization system is ideally suited for fast single-tier and double-tier paper and board machines. It can easily be retrofitted to existing machines as part of a rebuild project.

PrimeRun Evo


At the beginning of the drying section where the paper web has low strength there are various forces acting on the web, especially in the web release zone. This can lead to an unstable web run, creases, widening and edge problems following sheet breaks. ANDRITZ has created a concept with the PrimeRun Evo that supports trouble-free operation, even at high machine speeds. It does so by gradually reducing the vacuum from the opening nip. Not only does this improve web control, it also reduces energy consumption by up to 50% compared to classic runnability concepts.


Modules are the key

The PrimeRun web stabilization system consists of three modules that can be combined according to customer requirements:





1 suction box

PrimeRun Mono


1 suction box and 1 roll

PrimeRun Duo


1 suction box with 2 suction zones and 1 roll

PrimeRun Twin


1 suction box with 3 suction zones and 1 roll

PrimeRun Evo



The ANDRITZ PrimeVac roll is a core component of the new ANDRITZ web stabilization system and can be combined with the PrimeRun Evo and Duo. During the threading process, the PrimeVac roll fixes the web on the fabric with a pressure vacuum. This results in stable threading of the web through a single-tier drying section.

Ropeless tail threading is possible with the ANDRITZ PrimeFeeder for single-tier and double-tier machine configurations.

Single-tier dryer section   

  • PrimeRun Evo – with highest-vacuum zone at paper release from dryer and stepwise reduction of underpressure by 3 zones
  • PrimeRun Twin – with high-vacuum zone at paper release from dryer and a low-vacuum zone to the PrimeVac
  • PrimeRun Duo – two-sided stabilizer with PrimeVac
  • PrimeRun Mono – one-sided stabilizer in downstream direction
  • PrimeRun Poly – sheet transfer box between press and dryer section

Double-tier dryer section  

  • PrimeRun Mono – sheet stabilization
  • PrimeRun Jet – sheet stabilization
  • PrimeRun JetVent – sheet stabilization and pocket ventilation


Every type of paper and board machine must replace the air containing the evaporated water from the drying process with fresh and heated supply air. It is very important to distribute this air properly in the machine in order to maintain high drying rates and an even moisture profile, as well as to obtain a high-quality end product. ANDRITZ pocket ventilation systems enable uniform air distribution within the usual pocket geometry of the machine, ensuring easy maintenance and reliable performance.

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Paper, Fiber and Recycling Division
Stattegger Strasse 18
8045 Graz
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ANDRITZ Novimpianti S.r.l. | Marlia, Capannori (Lucca)
Via del Fanucchi, 17
55012 Marlia, Capannori (Lucca)
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ANDRITZ Küsters GmbH
Eduard-Küsters-Straße 1
47805 Krefeld
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