Domtar is investing $4 million to install new edger optimizer equipment at its Timmins sawmill. The new technology removes defects along the length of the boards by improving on lumber grades. The upgrade is regarded as necessary to stay competitive, efficient and essential to survive with U.S. softwood lumber tariffs. The fully computerized system will improve the mill's operational costs and should be on line in early April. No new jobs will be created, but the company says the upgrades will preserve jobs and should enhance health and safety procedures. The sawmill will be shut down for three weeks in March to install the equipment.