The Bubble Sucker in the press section provides for a stable web run and reduces or eliminates blistering of the paper web before its entry into the press nip.

By means of an ejector effect, the Bubble Sucker generates a vacuum of up to -150 Pa under the press felt in the stabilization zone. This enables a stable and crease-free web run, and the frequency of breaks is noticeably reduced.

Creation and maintenance of the vacuum in the entire stabilization zone are achieved by blowing air at high speed in the nozzle geometries at the entry and outlet and by means of side air knives on the Bubble Sucker. The vacuum can be set manually by means of a hand flap in the air supply duct. The design of the Bubble Sucker is easy to maintain.

TransferFoil stabilizes the web from the press into the dryer section, eliminating problems such as edge detachment, edge flutter and crease formation.

By means of an ejector effect, TransferFoil creates a vacuum (up to -350 Pa) behind the dryer fabric in the stabilization zone. The supply air is connected to the supply air system of the downstream stabilizers’ air knives. Use of TransferFoil after a dryer fabric suction roll facilitates ropeless threading to the nip between the drying cylinder and dryer fabric. No air bubble forms between the dryer fabric and paper web during feed-in. Due to TransferFoil’s multi-part design, an adjustment of the bodies to the fabric deflection can take place by means of the vacuum.

TransferFoil is used to hold the web after a dryer fabric suction roll between the press and the first drying cylinder.

ProRelease HighEnd is the latest development of the proven ProRelease⁺ for high-speed machines that produce low-basis-weight paper. It features separate exhaust systems for the release zone and the stabilizer roll. This enables a completely independent setting for the vacuum in the stabilizer roll and in the release zone. Equipped with MultiSeal Plus for higher release vacuum, ProRelease HighEnd ensures improved web pickup from the dryer surface and a higher draw reduction at the same speed. This reduces the risk of sheet breaks.

ProRelease⁺ has an efficient and energy-saving sealing system that ensures stable web pickup in the first dryer groups. A high vacuum in the release zone allows a lower paper draw at same speed.

The sealing system consisting of MultiSeal forms the release zone and in a targeted fashion provides for a high vacuum in the area where the paper web is picked up from the cylinder. This reduces the stresses that act on the still relatively wet and sensitive paper web when it is being removed from the cylinder. In addition, runability is improved in the particularly sensitive area of the first dryer groups. Fewer breaks and an increase in speed at the same draw are the results.

ProRelease⁺ is used in the first dryer groups of single-tier dryer sections and provides for stable web pickup.

Upgrade for ProRelease⁺

The upgrade for ProRelease⁺ consists of the new sealing strip holder MultiSeal Plus, which is installed with a sliding device. This allows the adjustment of the holder’s position according to the best operating position. With MultiSeal Plus, the high vacuum conditions can be optimized and constantly maintained over a longer period or the production speed can be increased. Another benefit is that the lifetime of the strips can be extended to more than a year. For the perfect fit, we recommend the installation of SkySeal Plus or SkySeal Flex sealing strips.

The DuoStabilizer provides web stabilization in the single-tier dryer section. Due to the ropeless and wrinkle-free web run, the runability of the paper machine is increased.

With web stabilization, the stabilizer roll is suctioned via the DuoStabilizer, and the stabilization zone is placed under pressure with a vacuum via the bypass of the roll. Sealing of the zone is done with a cost-effective and energy-saving sealing concept called MultiSeal, comprised of lateral air knives and a Teflon seal toward the roll. The MultiSeal is a mechanical seal that prevents the boundary air layer carried along with the dryer fabric from getting into the stabilization zone. For ropeless threading of the transfer tail, a threading zone can be separated in the system from the entire operating zone.

The S-Stabilizer stabilizes the web if there is a turbulent web run or edge flutter in the two-tier dryer section. In addition, the frequency of breaks is reduced due to the supported web run.

The S-Stabilizer stabilizes the paper web in the area of the dryer fabric. The dryer fabric guide roll is moved asymmetrically until it dips into the paper web. The number of breaks can therefore be reduced and machine availability increased. The paper web is stabilized through the use of a vacuum. It is created by means of an ejector effect behind the dryer fabric in the stabilization zone. The vacuum can be set manually through a hand flap in the air supply duct. The MultiSeal mechanical seal prevents the boundary air layer carried along with the dryer fabric from getting into the stabilization zone. Air knives seal on the sides to compensate for the deflection of the dryer fabric. In addition, there is a seal toward the roll.

The S-Stabilizer is used in two-tier dryer sections and allows an increase in speed due to stabilization of the web run.

The VentiBox hot air blow box is used for ventilating one- and two-tier dryer sections. It prevents the edge of the paper web from turning up and provides for better conditioning of the dryer fabric.

The VentiBox hot air blow box is connected to the air supply system within the machine frame or with a two-sided dryer section, also from the drive side. Via exhaust openings, hot, dry air is brought into the dryer fabric and the pocket that absorbs the water vapor and reduces the air moisture. The air supply is increased in the center of the VentiBox, and the moist air is transported from the center of the machine to the edges. This transverse flow prevents the edges of the paper web from turning up. Condensation and hydrolysis are also prevented by the VentiBox.

The VentiBox hot air blow box is used in single-tier and double-tier dryer groups.