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PRESS FELT ADVANCES WORLD PULPPAPER 75 As a specialist and market leader for non-woven and multi-axial press felts Heimbach has proven press felt technology pre-existing woven fabric or non-woven fabric structures can be combined with a multi-axial non-woven structure. These flexible and adaptable Atrojet modules are the dawn of a new era in press felts said Franz Kiefer who together with his colleague Jochen Pirig both Strategic Product Managers supervised the R D project launched in 2011 from the very beginning. The development project amalgamated not only the experience gathered over the years at Heimbach but also the results of a series of field trials with customers in Europe and Asia. The main focus was on an expansion of the spectrum of yarn material and counts. In this respect we no longer wanted to be limited commented Jochen Pirig. The actual objectives were clearly formulated Fast start high dewatering and high service lifetime. As the first manufacturer in the world to combine a multi-axial non- woven structure with conventional woven bases the company from Dren revolutionised its proven press felt technology and can now offer tailored flexible and adaptable base combinations in its Atrojet product line. The name chosen for the new product By Franz Kiefer and Jochen Pirig Heimbach GmbH Co. KG Coarse or fine A suitable design the crux of the matter is the lamination and the knowledge of how the process parameters are kept constant line is no accident the suppliers want the paper manufacturer with the innovative Atrojet felt design to discover new shores Atrojet technology is globally unique and can be adapted to the individual requirements of each application. To achieve this Heimbach designed a specific paper side Atrojet base module and combined it with existing base modules. The resulting multi-axial non-woven base offers far greater flexibility in the composition of both yarn and twisted yarn structure than conventional non-woven or woven structures. The selection of a suitable base in the substructure enables tailored felt designs. Understandably Messrs Kiefer and Pirig would rather not reveal too many details of their secret part of the manufacturing process but they are prepared to confirm that the crux of the matter is the lamination and the knowledge of how the process parameters are kept constant. Figure 1. Franz Kiefer left and Jochen Pirig Strategic Product Managers at Heimbach