Pulp Paper & Logistics
HEIMBACH 21
matter is the lamination and the knowledge of how the process parameters are kept constant”.
Globally unique What is claimed for Atrojet is an incredible flexibility resulting from the mix of yarn material and yarn counts: From very high, dense yarns with thin twisting or monofilaments to 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 yarn structure has a positive effect on the absorption of tensile forces, giving enhanced strength and contributes particularly towards 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 uniform dewatering and a uniform paper CD profile. Atrojet designs are also particularly suited to positively influence paper surfaces in respect to 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
With its uniform machine direction yarn structure, Atrojet has far greater surface contact than conventional bases. This leads to a more even pressure transmission at the press nip resulting in very steady dewatering and even CD profiles
paper grades and a selection of different raw materials.
Tissue in focus The production of tissue paper makes extremely high demands on the press felt: A high degree of dewatering must be achieved at extremely fast running speeds. Also a new press felt has to reach optimum performance within just a few hours. Another consideration is: When
drying, energy requirements (gas and steam consumption) demand greater consideration than in the
production of graphic papers. The fine fibre batt layers typically used means that tissue felt has a tendency toward compacting and contamination. Here Atrojet press felts can
have a particularly positive effect thanks to their tailored adaptation and outstanding properties. This makes them ideal for use in the tissue sector, particularly because Heimbach adapts Atrojet to the specific requirements of tissue manufacturers. The adaptability of the yarn structure enables the
implementation of an extremely compact and very fine Atrojet module. This can, for example, be combined with an open substructure.
Reduce energy requirements An Atrojet press felt matched to tissue production opens opportunities for actively optimising energy requirements: The fine, homogeneous Atrojet MD yarn structure enables fast start-up and the highest possible dewatering. The best possible
4 May/June 2016
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