Packaging Corporation of America reported third quarter 2017 net income of $139 million, or $1.47 per share and $1.68 per share excluding special items. Third quarter net sales were $1.6 billion in 2017 and $1.5 billion in 2016.   “Our containerboard and corrugated products price increases were implemented as planned and we continued to have strong demand in our packaging segment,” Mark W. Kowlzan, chairman and CEO, said. “Our containerboard mills ran very well and set an all-time quarterly pr...