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PRESS FELT ADVANCES WORLD PULPPAPER76 GLOBALLY UNIQUE The success of Atrojet is down to an incredible flexibility of both yarn material and yarn counts. Whether from very high dense yarns with thin twisting or monofilaments or from more moderate or low yarn counts Heimbach tailors each module to fit closely to the felt properties requested by the customer. Atrojet technology also enables the processing of different yarn geometries. The uniformly directed MD yarns are characterised by high symmetry and precision spacing. This homogeneous structure enables key felt characteristics to be emphasised and improved. The uniform machine direction MD yarn structure has a positive effect on the absorption of tensile forces in turn this gives enhanced strength and makes a major contribution towards an economical service life. With its particularly dense MD yarn structure Atrojet has far greater surface contact and homogeneity than conventional bases. This brings about a more even power transmission in the press nip and results in very uniform dewatering as well as a uniform paper CD profile. Atrojet designs can also have a positive influence on paper surfaces in regards to its smoothness and printability. This is of importance for the graphic paper sector and also in packaging field where the demands on printability are continuously growing. More open felt designs usually improve void volume retention and allow particularly effective cleaning of the press felt. This is particularly important for machines with a larger range of paper grades and a selection of different raw materials. The uniformly directed MD yarns are characterised by high symmetry and precision spacing Figure 2. Atrojet module Figure 3. With its uniform machine direction yarn structure Atrojet has far greater surface contact than conventional bases. This leads to more even pressure transmission at the press nip resulting in very steady