Simple ergonomic handling
The V-type crane revolutionises load handling.
The DMR provides a unique range of possible combinations,
Since March 2010, the PM2 in Eisenhüttenstadt, Germany, has been producing corrugated base paper that has a width of 10.2 m and is the highest-performing paper machine in the world. Testliner and Wellenstoff weighing between 70 and 130 g/m2 are produced on the basis of fully recycled paper. The prime objective is for the installation to reach maximum performance as quickly as possible. The reels will then be filled with 1,800 m of base paper every minute.
Only eight months after it was first put into operation, the PM2 achieved a world record for the production of paper with a weight of 90 g/m² in continuous 24-hour operation. In April 2011, the factory set another world record: Wellenstoff paper weighing 80 g/m² continuously ran off the machine at a speed of 1,650 m/min for 30 hours.
The high production output requires reliable flow of material, which demands smooth logistics and efficient handling up to and including the shipping operation. To satisfy these requirements, Demag Cranes & Components supplied the entire crane equipment for the paper factory and the paper roll store and networked the production and logistics operations with a warehouse management system.
Demag cranes play a leading role wherever parts of the installation have to be safely transported, reels have to be picked up in cycles to match the paper machine operating cycle and rolls of paper have to be carefully stored.
Three Demag process cranes were already used for the safe, reliable and fast transport of loads when the paper machine was assembled. Thanks to the cranes, which are equipped with up to five hoist units, the various parts of the installation were precisely and reliably positioned for assembly of the PM2 machine.
Hoist units with load capacities of 130/65/65 t are available for duty at the wet end of the machine. This arrangement allows the rollers and all elements of the machine to be precisely lifted and transported for maintenance and repair purposes.
In normal daily operation, quality only pays off at the corresponding speed. In time with the machine operating cycle, the crane installation above the dry end of the PM2 ensures that empty reels are swiftly returned from the rewinder to the reel store. Master/slave mode provides for absolute synchronized operation of the two 130 and 90 t hoist units – and, therefore, for a high level of safety and reliability.
If required, this crane can also temporarily retrieve the full reels. To do this, it employs a rotating spreader which is used to lift the full reels, which weigh up to 160 t, and deposit them parallel to the paper machine.
Additional flexibility of these three crane installations is provided by two further hoist units, which enable all maintenance and repair work to be carried out. Two DR-Pro rope hoists travel along the crane girders of each crane in the form of cantilever crabs. Thanks to their compact design and fast lifting speeds, they are used for installing and removing machine parts that weigh up to 10 tonnes.
The entire annual production of 650,000 t is transported to the paper-roll shipping store by
conveying systems. Here, three fully automated process cranes that are equipped with vacuum lifting devices are responsible for gently storing the unpacked rolls of paper, which weigh up to 5,300 kg. The cranes stack the rolls up to a height of 17.5 m in two bays.
In each bay, two variable-sized blocks have been created for storing reels with diameters of between 1,400 and 1,600 mm. At a theoretical fill capacity of 80%, the store can accommodate 42,000 t of paper.
Cranes for paper production and storage
*) ZKKW: Process crane with winch units
ZKKE: Double-girder standard overhead traveling crane
EKKE: Single-girder standard overhead traveling crane
Cranes above the dry end for handling full reels with a powered rotating spreader
Crane 3 above the paper machine for service and maintenance work
Load handling on two operating levels: Demag process crane in the stock preparation bay
Three process cranes on one runway: Crane 3 fitted with four hoist units above the stock preparation bay
Overhead travelling crane with two hoist units for handling bundles of paper cores
The rolls are safely stacked up to a height of 17.5 m
Gentle transport and storage: Demag crane system fitted with vacuum equipment
Three automated process cranes for storing the annual production of 650,000 t
Crane systems for manufacturing paper and automated storage of rolls
Large overhang – constant or variable
Efficiency thanks to high handling rates