Hamidreza RUDI - Department of Wood and Paper Science & Technology, University of Tehran, Karaj, Iran.
Yahya Hamzeh - Department of Wood and Paper Science & Technology, University of Tehran, Karaj, Iran.
Ghanbar Ebrahimi - Department of Wood and Paper Science & Technology, University of Tehran, Karaj, Iran.
Rabi Behrooz - Faculty of Natural Resource and Marine Sciences, University of Tarbiat Modares, Noor, Iran.

Recycled fibers, with its inferior quality, are experiencing severe competition to produce packaging paper [1]. This means there is a great need to improve paper quality.Polyelectrolytes Multilayering (PEM) has been found to increase mechanical properties of papers in recent years [2]. In this study, multi-layers build up of cationic and anionic starch on recycled fiber (OCC) with different degree of substitution (DS) of cationic starch was investigated using Layer-by-Layer (LbL) technique