Research Of Non-Stick Materials For Applications In Tissue Machines

Abstract: This thesis have investigated a few materials that exhibits non-stick properties for applications in tissue machines. In the process of making tissue there is problems with build up of fibres and glue. To overcome these problems Valmet AB are looking to find coatings that will facilitate cleaning. The main problem area is the drying section where glue is used to help the sheet to stick to the steam filled Yankee cylinder which is performing the final drying of the sheet. A basic discussion of the theory behind surface properties is made before the materials are chosen, experiments are conducted and results presented. The materials are ranked in order of performance based on the experimental data. To ensure that the top performing materials can be applied to usage in a real tissue machines a few possible future studies is suggested. The top performing materials were fluoropolymers. These materials are very expensive which making their usage limited to critical parts. Two silicon based materials performed at a surprisingly high level making them highly attractive for wider usage in less critical areas in a tissue machine.