The DuoShake DG shaking unit for the breast roll contributes to a more homogeneous distribution of fibers and an increased orientation of the fibers in cross direction. Paper quality is increased due to improved formation in Fourdrinier paper machines. This results in benefits for the downstream processing, coating, impregnating and printing of the paper.

Two rotating pairs of imbalance masses are arranged on the hydrostatically mounted carriage of DuoShake DG. The rotation causes forces to develop that are transferred to the breast roll with a shaking rod. Compared with conventional shaking units, the system, which oscillates freely in horizontal direction, only transfers negligibly small friction and centering forces to the base. The base only has to support the dead weight of DuoShake DG; no disruptive reaction forces are transferred to the headbox or wire section.

In the event of changes to production conditions or a grade change, new values can be input at any time direct at the paper machine. DuoShake DG allows the infinitely variable adjustment of shake stroke and frequency during operation of the paper machine. There is no mechanical stroke adjustment.

DuoShake DG is available in two different sizes with 250 Nm and 800 Nm drive motors. The size required can be roughly determined based on the operating characteristics. A dimension sheet can be used on site to check whether the space available at the paper mill is sufficient for the installation size selected. The dimension sheet is contained in the brochure.

Paper producers can reduce fiber consumption by using DuoShake DG. Further savings relate to the use of strengthening agents (chemicals). Overall the system is very robust, and the hydrostatically mounted carriage is low-wear, which results in a very high reliability.

The newly developed FloatBearing is the ideal solution for making optimum use of the performance of the DuoShake DG. The hydrodynamic bearing reduces the friction between the metal surfaces of a shaking unit even at low machine speeds.

The use of the FloatBearing eliminates the inherent disadvantages of cylindrical roller slide bearings. With the hydrodynamic principle, the rotating journal conveys oil into the convergent bearing clearance. The oil pressure building up there lifts the journal from the bearing bushing. This ensures a complete separation of the metal surfaces by the oil. The shaking unit can be operated and the bearing works in a no-wear manner.

Thanks to its compact design, an upgrade to the FloatBearing involves only a small rebuild outlay. The enclosed design, integrated cooling grooves and optimized seal with labyrinths and protective hoods provide for a high level of operational reliability.

Even in the case of a short-term stoppage of the oil hydraulic system and associated stoppage of the bearing’s oil supply, limited further operation of the bearing without damage is ensured by a specifically developed and patented emergency lubrication system.