18 ANDRITZ


Pulp Paper & Logistics


The ANDRITZ PrimeLine


MG machine at Zellstoff Pöls in Austria


steel have significant advantages over cast iron models. Due to the elasticity of the steel, spontaneous fracture is impossible. Furthermore, up to 10 per cent higher heat transfer is achieved. “The extremely large diameter of the Yankee is of central technological importance,” explains Gruber. “This ensures that the paper remains on the hot surface of the Yankee for the required dwell time, even at maximum production rates, in order to produce the smoothness typical of MG papers. “The effort has been well


worthwhile as both the drying performance achieved and the smoothness of the paper are very good.”


Successful start with good prospects Another innovative component is the Vertical Screw Thickener (VST). Due to its vertical design, the VST has a small footprint and takes up relatively little space. The vertical design has additional advantages; pulp fed in from above is dewatered by means of gravity and additional mechanically caused pressure. The


entire available screening area at the bottom of the screw is fully used – resulting in high efficiency; the VST dewaters the pulp in Pöls from an inlet consistency of 3 per cent to up to 30 per cent at the outlet – a peak value. And there’s a further aspect: the


water circuits of the pulp mill and the paper machine are separated from each other. The VST is located just before the storage tower that supplies PM2 and PM3. The filtrate removed from the screw press is returned to the pulp mill where it is reused. The dewatered pulp is then diluted to


PM3 machine data at a glance


● Annual capacity 100,000 tonnes


● Design speed 1,400 m/min ● Working width 5.4 m ● MG papers for flexible packaging and release: 20–70 g/sqm


● Commissioning: May 2019 – two weeks ahead of schedule


12 per cent with hot water from the paper machine. It worked smoothly right from the beginning. This great start is certainly also


Five TwinFlo disc refiners enable smooth and efficient refining July/August 2020


Based on the ANDRITZ engineering and logistics concept, the Yankee was transported in two halves and assembled on site


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