Jan 17, 2012. /Lesprom Network/. U.S. containerboard production in December was flat, gaining only 0.8% over same month last year. The production was also flat when compared to November 2011, increasing 0.2%, however, the month over month average daily production decreased 3%. The containerboard operating rate for December 2011 was up slightly from December 2010 to 93.6% from 93.1%, as the American Forest & Paper Association said in a press release received by Lesprom Network. The American Forest & Paper Association is the national trade association of the forest products industry, representing pulp, paper, packaging and wood products manufacturers, and forest landowners.