MILWAUKEE--(BUSINESS WIRE)--General Plastics, Inc. is expanding its Milwaukee production facility, adding manufacturing equipment and hiring new employees as part of a two-year $4 million expansion project launched to keep up with growing demand. General Plastics is adding 42,000 square feet of space to its existing Milwaukee plant and expects this $3 million expansion to be completed in October. The company also has added $1 million in manufacturing equipment. The manufacturer of custom plasti