‘Circular Economy’ joins Industry 4.0 as common themes of injection molding exhibits in Düsseldorf. If you attended a major international plastics trade show in recent years, you were likely bombarded with messages that the future of plastics processing is “digitalization,” also known as Industry 4.0. That theme will continue in force at October’s K 2019 show, where numerous exhibitors will present their latest features and products for “smart machines, smart processes and smart service.”  But another overarching theme will claim pride of place at this year’s event—“Circular Economy,” which refers to the whole range of strategies for recycling and reuse of plastics waste, as well as design for recyclability. While this will be one of the dominant notes sounded at the show, other elements of sustainability, such as energy savings and lightweighting of plastics parts, will be heard frequently as well. How does injection molding relate to the idea of the Circular Economy? A number of exhibitors will endeavor to answer that question: •  Because variation in melt viscosity is one of the major challenges to molders of recycled plastics, Engel will show how its iQ weight control softw...