Abstract: A web material roll rotatable retention assembly, comprising a shaft adapted to be inserted into a web material roll core and having a hydrogel filled chamber is disclosed. A hydrogel pressure applying assembly controllably applies pressure to the hydrogel and an outward pressure applying assembly pushes pressure applying members outwardly in response to the pressure of the hydrogel.

Abstract: The invention relates to the distribution of mail items with information on the surface of the mail items. Distribution occurs successively by means of various sorting machines. Sorting in particular is carried out in a succession of operations for the last point of distribution. According to the invention, distribution points are determined once the mail items have been received in the first sorting machine and the thicknesses of the mail items are measured by optical scanning of the mail item surfaces. Mail item thicknesses allocated to the distribution points are registered, stored and statistically prepared if required. Optimized sort programs are then calculated for sorting machines assigned to the various distribution points based on information regarding thickness, and the mail items are distributed accordingly.