Packaging Corporation of America reported second quarter 2017 net income of $143 million, or $1.52 per share and $1.52 per share excluding special items. Second quarter net sales were $1.6 billion in 2017 and $1.4 billion in 2016.   Excluding special items, the $.27 per share increase in second quarter 2017 earnings compared to the second quarter of 2016, was driven primarily by higher prices and mix ($.25), sales volumes ($.09), and production volumes ($.03) in the Packaging segment, lower an...