To transform the TX industry from linear to circular is one of the biggest challenges of this century. As a circle has by nature no beginning and no end every segment of a circular system has to work and if only one segment suffers the circle is interrupted. In the context of recyclability and as one segment of the circle we as a fiber producer have to convert a recycling pulp originating from a very inhomogenous pile of TX waste, being produced by a number of different technologies into pristine new fibers. The challenges we are facing will be highlighted in the presentation.