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OPTIMAL DEWATERING WORLD PULPPAPER54 facility in Neuss Germany. A number of drainage technologies had been thoroughly evaluated by the experienced technical team at the mill. Trials on the paper machine revealed that the incumbent PEI program gave the best performance despite data from traditional lab testing that showed otherwise. The Total Dewatering Concept developed by Solenis was then applied to studying the dewatering characteristics of the furnish. Simulating each step in the dewatering process gave an insight into the optimum floc structure required to effectively manage water removal at each stage Fig. 3. Once this was established it was then possible to develop novel polymers that enhanced each dewatering step. 4.1. Collaboration with Mayr Melnhof Mayr Melnhof Neuss Mill was established in 1911. Today it has the largest and most modern recycled fibre folding carton board machine in Europe. The grades produced at the Neuss mill are characterised by consistently high quality and application safety making them perfect for use in the food and non-food packaging sector. It achieves these results with the following machine characteristics 4-ply Fourdrinier machine producing folding carton board Different furnishes in each ply Production 55 tonnes per hour Grammage range 180 to 375 gsm Machine speed 425 to 850 metres per minute Mid Ply 100 Recycled Packaging As the basis weight of the mid ply increases control of dewatering in the press and dryer sections becomes critical. The initial trials at Neuss focused on replacing PEI in the mid ply. The application of the Total Dewatering Concept was used to select the most effective polymer for managing dewatering during forming pressing and drying. PerForm PC303LM was found to give the best results especially after pressing. Based on these findings the mill at Neuss implemented a program in which overall water removal in the mid ply is controlled by a post- screen injection of up to 3.5 kgT polyethyleneimine 70 reduction and up to 850 gT PerForm PC303LM dosed via Solenis PerForm VMax 1000 injection system. The actual dosages vary according to the grade being produced. 4.3. Program Results Following the successful application in the mid ply the program has now also been extended to the outer plies PerForm PC303LM up to 400gT dosed via PerForm VMax1000. Such has been the success of the program that it will soon be adopted by other similar machines. The application of the Total Dewatering Concept was used to select the most effective polymer for managing dewatering during forming pressing and drying Figure 2. Pressing Results