Pulp Paper & Logistics


HEIMBACH


ANDRITZ 17


Why SSP?


Figure 2: Atrocross – The yarns of the non-woven fabric are made of individual twisted monofilaments


Advantages of single-shoe presses (SSP)


• Lower investment costs (one-time)


• Less space requirement


• Lower operating costs (permanent)


this contradicts itself as we surely cannot develop felts that are both ‘open’ and ‘dense’... Or can we?


Milestone – Atrocross In 2002/2003, a completely new design of felt was developed using mathematical and physical simulation programmes, as well as numerous laboratory tests. An Atrocross (Figure 2) was


installed on a single shoe press producing fine paper: a press felt


design that has been proven to provide extremely fast start-ups and to be a pronounced nip-dewaterer. Due to continuous developments of non-woven technologies, a dry content of up to 56 per cent after the press section is achieved by now. Excellent moisture profile and minimal two-sidedness are observed at the same time. This would therefore imply a felt that is simultaneously ‘open’ and ‘dense’. Moreover, the two Atrocross


felts dewater as much as the first, second and third presses of a conventional roll press combined – and with only a single nip (Figure 3).


• Reduced downtime through clothing changes


• Lower clothing costs


• Maximum dry content after press


Figure 3: Atrocross – Maximum nip dewatering November/December 2016


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