The upgrading of wood chips entails the removal of contaminants (e.g., bark, foliage, rot and grit) and the modification of chip size. The Paprifer process, developed in a joint project between Paprican and FERIC, achieves this through the use of industry-proven equipment. The method has been the subject of trials with a variety of furnishes using a one tonne (OD)/Day Laboratory Pilot Plant and more recently, a 56 tonne (OD)/DAY Millyard Prototype Manufactured by Hymac Ltd. In service the process stands to enhance existing sources of fibre, and permit the wider use of cheaper furnish, such as full-tree chips. Experimental findings are reviewed.