From forest to digester, North American mills have been exploring ways to increase the value realized from the fiber in the logs.
For example, bringing logs into the mill in tree lengths rather than in short sections reduces log handling and the amount of fiber lost in the woods. Sandwell assisted in the installation of long-log facilities at Virginia Fibre Corporation’s mill in Amherst, Virginia, and at five mills in the Georgia-Pacific organization.
Chip thickness screening systems enhance digester operations by providing a more consistent chip size for processing. Sandwell has a substantial record of successful CTS studies and installations. Recent examples include systems for Avenor Inc. in Gold River, British Columbia, Harmac Pacific Inc. in Nanaimo, British Columbia, Virginia Fibre Corporation in Amherst, Virginia, and Georgia-Pacific Corporation in Woodland, Maine.
While sawdust is often burned as a waste product, it has a market value for some pulp mills. The sawdust digester system designed by Sandwell and installed at Fletcher Challenge Canada’s Elk Falls, British Columbia mill came on line in late summer. The sawdust pulp, when blended with bleached kraft pulp, adds unique qualities for making certain grades of paper.
Our chip thickness screening projects have ranged in size from 70 to 360 BDU/h.
CTS projects typically feature:
- disc scalping
- primary, secondary and tertiary screens
- air density separators
- chip conditioners
