20 HEIMBACH
Pulp Paper & Logistics
Configuration: single width, crescent former with Uhle roll and blind drilled press Speed: 1,500 m/min, paper grade: Tissue, 16-46 g per sq m
Configuration: double width, crescent former with Uhle roll and blind drilled press Speed: 1,530 m/min, paper grade: Tissue, 12-21 g per sq m
Configuration: double width, crescent former with shoe press Speed: 1,950 m/min, paper grade: Tissue, 12-35 g per sq m
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Configuration: single width, crescent former with shoe press Speed: 1,800 m/min, paper grade: Tissue, 12-40 g per sq m
million nip cycles and handling more than 50,000 cubic metres of water are normal requirements for a tissue felt. In addition, the level of performance is expected to be at steady high level all along the service life of a felt. Modern press felt designs from Heimbach are high-tech products which meet these requirements. In the case when process parameters are unvarying the felt design can be fine-tuned to its maximum performance under standard conditions. When the process parameters
do vary, the design can be more challenging to achieve an adaptable felt design. Typical
September/October 2019
examples of varying process parameters are paper grade changes which include machine speed and weight changes but also affect usage of different furnish compositions such as virgin pulp or recycled fibres as well as usage of wet strength resin or dye and fixative. Production planning is always aiming for as smooth as possible transition of process parameters during machine clothing lifetime. But these days flexibility can be key too, just to think of just- in-time deliveries, so sudden process changes may do occur. The press felt has to tolerate these changing conditions. In this case, the Atrojet design
Configuration: single width, crescent former with Uhle roll Speed 1,800 m/min, paper grade: Tissue, 16-30 g per sq m
flexibility offers advantages to adapt to those changing conditions well. Thanks to the homogeneous and strong inner structure, which also contributes to high fibre batt anchorage, Atrojet has proven its robustness towards harsh high pressure shower cleaning which
can prevent felt clogging such as when changing from virgin pulp to DIP and/or producing non wet strength to wet strength grades. Atrojet has been proven itself in the field to be able to take up even long-term laminar HP shower at pressures of more than 30 bar.
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