Pulp Paper & Logistics
ANDRITZ 13
process for all those involved. The film press was also new ground for us, but we had it well under control from the word ‘go’.” Two months later, the challenges
involved in every start-up were resolved, and the paper machine is running very smoothly without any web breaks, according to all those involved. The highest daily gross production so far was on 17 March at 1,360 tons saleable production. The speed was in the region of 1,200 m/ min, and the operators have already set a target of 1,400 m/min. Since the beginning of the year, the plant has seen very stable production – considerably above the planned start-up curve. “The market situation for our
new product is currently very good. That’s why we also did not want to have any delays,” says Lunabba. The company expects the demand for corrugated base paper to increase by 5 per cent per annum, so the timing is absolutely perfect. “We wanted to sign contracts at the end of 2017 for 2018,” he says, and refers to the positive feedback from the market, “The goods we sent to customers received top ratings. There was not a single complaint.”
Grand finale After 17 years at Laakirchen, Mark Lunabba is retiring. The PM10 project was thus the grand finale of his career. “I am leaving on a high note and with confidence in the top-performance organisation we have here,” he says. Johann Stadlmayr is also looking
to the future with optimism: “This was one of the most challenging, intensive, and exciting projects for Laakirchen and one that involved major changes. It was a great achievement and we can all be proud of where we are today. This is a key project for the future!”
Getting technical
Advanced stock preparation The former groundwood mill was rebuilt into a complete OCC line with a capacity of 1,350 tons per day. The rebuild of the existing approach flow system, as well as systems for sludge and reject handling, were also part of the scope. The pulping system with detrashing includes a FibreSolve FSR pulper with a volume of 130 cubic metres, which is the largest low consistency pulper Andritz has ever installed in Europe. In the process, this is followed by high-density cleaners, coarse screens, and a five-stage cleaner plant. In coarse screening, ModuScreen tailing screens were combined with existing screens fitted with new BAR-TEC Rejector screen baskets and Dolphin rotors. The fractionation section
comprises a combination of existing equipment and a ModuScreen A with a matched screen basket/rotor concept and hydraulically optimised shape that guarantees both excellent fractionating effect as well as smooth operation. The long fibres are processed further in a four-stage screening plant – once again combining existing screens, fitted with new BAR-TEC Valeo baskets, with new ModuScreens F. In addition, in the short- and long-fibre lines, the stock is thickened with new and re-used disc filters and twin wire presses. In the approach flow system
two low-pulsation ModuScreen HB-E units with proven inflow design were installed in the base ply. The existing deculator, which is now used for dilution water only, has been rebuilt and
The Prime rebuild of the paper machine. The headbox enables the best profiles at maximum production flexibility
converted from full flow to partial deaeration.
A Prime rebuild of the paper machine A PrimeFlow TW double-layer headbox with PrimeProfiler F consistency profiling system was installed at the wet end. This headbox enables the best profiles at maximum production flexibility with a stiff separating lamella between the layers. The new PrimeForm TW gap former with a specially-designed forming suction roll surface provides high dewatering capacity and gentle dewatering at the same time and ensures high first-pass retention. Forming shoes on both sides of the sheet enable optimised dewatering within a broad operating range. In the first drying group, the new generation of PrimeRun Evo web stabilisers are used to improve the runnability of the machine after the press section. The PrimeRun Evo web stabilisation system uses step-by-step reduction of vacuum in free draw to control the paper web’s runnability. The main principle is to divide the vacuum into three different
zones depending on the vacuum needed to neutralise the forces and stabilise the web. In addition, PrimeRun Duo
web stabilisers were used in the pre-drying section and in the new after-drying section to enable an even web run throughout the drying section. PrimeDry Steel cylinders were selected instead of traditional cast-iron. Steel cylinders yield better drying performance with the same size and operating pressure and thus provide a means of increasing production or saving energy. Moreover, a new air system including heat recovery for the rebuilt drying section was supplied to also enable energy-efficient paper production. The new PrimeFilm film press applies starch simultaneously to both sides of the paper web in order to achieve the desired strength values at the high speed specified of up to 1,600m/min. The PrimeAir Glide AirTurn and PrimeFeeder sheet transfer system ensure gentle turning as well as safe and rapid transfer of the web through the entire paper machine.
May/June 2018
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