In 1995, the current fiberline at Weyerhaeuser's Longview, WA, mill replaced a much older one on the same site. It has a 1200 tpd two-vessel hydraulic Lo-Solids Kamyr digester, followed by a pressure diffuser, a single-stage medium-consistency oxygen delignification system with wash presses fore and aft, and a DEpD bleach plant. The fiberline is designed to rapidly swing among three different chip furnishes. As well as making market pulp, it supplies the reinforcing pulp for the 2000-tpd North Pacific Paper newsprint mill next door.
Two-vessel digester (right) Inspecting chips DEpD bleach plant
pressure diffuser (middle) with diffusion washers