IMark Molding Inc., a 70-employee plastic injection molding company in St. Croix County, is planning to invest $18 million in its facility based less than an hour outside of the Twin Cities, resulting in the addition of 40 jobs there, according to the Wisconsin Economic Development Corp. Woodville-based iMark, which was founded in 2000, makes plastic parts for companies in the medical device industry. The expansion calls for adding 80,000 square feet to the facility, plus renovating and adding...