Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
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.
Engineering: Mechanical Engineering, spec. in Materials Engineering (300 ECTS credits)