b'PRESS FELT TECHNOLOGYModern press felt designs from Heimbach are high-tech products which meet these requirements. In cases where press parameters vary very little, the felt design can be fine-tuned to its maximum performance under those standard conditions.The more process parameters vary, the more challenging the designing canFigure 4. Configuration: single width, crescent former with Uhle roll and blind drilled pressSpeed: 1500 m/min, paper grade: Tissue, 16-46 g/m2be to achieve an adaptable felt designA typical example of varying process parameters are paper grade changes which include machine speed and paper weight changes but also affect usage of different furnish compositions like virgin pulp or recycled fibres, as well as usage of wet strength resin or dye and fixative. Figure 5. Configuration: double width, crescent former with Uhle roll and blind drilled pressSpeed: 1530 m/min, paper grade: Tissue, 12-21 g/m2.The more process parameters vary, the more challenging the designing can be to achieve an adaptable felt Figure 6. Configuration: double width, crescent former with shoe press Speed: 1950 m/min, paper grade: Tissue, 12-35 g/m2. design. 54 TISSUE TECHNOLOGY INTERNATIONAL'