KRAFT LIGNIN IN PHENOL-FORMALDEHYDE RESIN - PART 2 - EVALUATION OF ANINDUSTRIAL TRIAL

A kraft lignin phenol formaldehyde resin with half the normal amount o f phenol used in phenol formaldehyde resin replaced with kraft lignin was prepared on an industrial scale and used as an adhesive in the ind ustrial production of plywood. The resin production, as well as the ap plication of the resin in plywood manufacturing, could be performed wi thout any changes in the normal industrial routine. It was necessary t o increase the hot-press time of the kraft lignin-containing resin by approximately 15% compared with the press time adopted for standard ph enol formaldehyde resin, in order to achieve full bonding strength of the inner adhesive joints (5-ply).