A fiber for thermal bonding comprising semicrystalline random copolymers of propylene, 1-hexene and optionally another \u03b1-olefin, the amount of 1-hexene being from 0. or more when dispersed in water and that have a MFT 40\xb0 C. A central control unit is configured to receive deposit information from the safe assembly and to generate and transmit deposit reports.