Paper machines

Paper machines are used for the production of paper, paperboard or cardboard. In the process, the material runs through various processes and stations in the paper machine. One of these is sieving, in which the actual sheet forming process takes place - from head box to paper quality optimisation, pressing, drying, reeling and finally cutting.

Thanks to their accuracy, compactness and displacement capacity, SCHMIDT-KUPPLUNG couplings are used in a variety of stations in the shaking process of breast rolls and for driving sieve rolls and paper cutters, such as longitudinal and cross cutting machines, three-knife trimmers and rotary cutter systems.


Axially stiff coupling in the head box
The so-called head box is located at the beginning of the papermaking process. In this phase, the fibrous material suspension is fed to the rotating sieve. Axial motors control the valves to correct and adjust the water quantity. To emphasise precise positioning movements, the >>Loewe GK Linear coupling performs here its function. This coupling system made of high-strength aluminium offers high axial stiffness and enables the precise transmission of pure linear actuating pulses. In addition, the coupling allows the necessary compensation of angular and radial displacements through swivelling or sliding movements in maintenance-free bearings.


Fibre arrangement optimisation
In the subsequent sieving step, fibre arrangement optimisation is performed to obtain correspondingly high paper quality. The >>Semiflex Standard couplings carry out the breast roll motion sequence. Due to high torques and occurring impact and vibrating torques, the coupling is carried out in a tension hub version.


Short-lenght connection in paper-cutting systems
In the further machining process, products are given defined formats. This occurs in so-called paper-cutting systems such as three-knife trimmers or cross cutters. For example, after a printing step, arcs are cut according to layout specifications, before they reach, for example, the folding machine. Likewise, after folding and binding, the final format must be subjected to one more final trim.

Due to their compactness and accuracy, Semiflex Compact Plus couplings are used in paper-cutting systems.  They meet the application requirements according to which, despite the compensation of construction-related radial displacements, absolute angle synchronisation of the connected shafts must be guaranteed in line with the precise cutting process.


In further processing machines
such as corrugating board manufacturing ones, torsionally stiff couplings are used to drive corrugating and relief rollers. In book binding machines, couplings of the >>Semiflex line operate in folding mechanisms, glue rollers, adhesive binders and logging systems.


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