ONTARIO — Cascades announced Tuesday it is shuttering its two containerboard-packaging facilities in Quinte West and Belleville. The layoffs will impact Cascades’ Trenton carboard-manufacturing mill on the east side of the Trent River – formerly known as Domtar — as well as Cascades Belleville operations. The Trenton facility has been idle since last month. Up to 150 workers will be affected in Trenton while a further 80 have received layoff notices in Belleville, confirmed Hugo D’Amours, Cascades VP of communications. …“The market environment as well as the operating costs … are forcing us to announce the closures,” he said, noting a third plant is being closed in Connecticut. …Trenton workers are represented by UNIFOR and Belleville employees are represented by Independent Paperworkers of Canada Local 7. …“The annual production capacity of the equipment to be shut down is 175,000 short tons of corrugated medium and 500 million square feet of corrugated packaging,” the company stated.