Pulp Paper & Logistics


XERIUM PACKAGING


For example, the trend toward printed packaging papers, some of which specify ever lower grammages, demands not only finer paper quality to improve printability, but also comes along with adapting machine layouts and often rebuilding machines that were previously used for newsprint or graphic papers. To guarantee measurable product advantages, developers therefore sharpened their focus on detailed application analyses at site when designing the new product lines. The result is a product package consisting of a rage of new forming fabrics, press felt and roll technology designs. The challenge in the packaging


sector is in the wide range of paper types that must be covered by a single paper machine. Printability, machine speed and a wide range of basis weights are key specifications that can only be satisfied by advanced PMC technologies. New product structures, material and polymer development are important input variables. The performance attributes of the individual product groups are not only tuned to the particular target machine, but also interact in such a way that their individual benefits cumulate along the key drainage sections, which makes the final consolidated value added quite respectable.


Maximising drainage performance and optimising sheet forming To meet the stricter specifications of paper makers, Xerium focused its forming fabric design efforts on the fabric surface and material development. Drainage, sheet formation and running life are still the three most important parameters for efficient paper production. The fabric design


INDUSTRY NEWS 17


Xerium press felts – comparing void volumes between single base and laminate


aims to balance these parameters in a way that maximizes the performance of the particular application. To achieve this, it is essential


that developers have detailed knowledge about each and every paper machine position, even the most specialized. For example, the EDC concept (Engineered Drainage Channels) successfully used in the past on graphic paper machines can now also be applied


to packaging machines. Special material developments combined with innovative running side structures guarantee the required stability without restricting drainage.


Cutting edge product technology Rising machine speeds are also causing a change of heart in the packaging machine sector. Uhle box drainage is increasingly being


replaced by nip drainage because Uhle box dwell times are too short to achieve optimum drainage. Here the strengths of Xerium’s designs are also applicable to packaging machines, especially the single base concepts. Xerium’s extensive web


technology expertise, which is based on graphic segment applications, provides a number of advantages, especially with basis weight variations – the most


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Xerium press felts – single base B&P July/August 2015


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