Inject Engineering bringing work to U.S. moldmakers


Sometimes old dogs do learn new tricks, and start new businesses to make those tricks pay off. John Linder, who turns 59-year-old this week, has had a long career in mold design and manufacturing, and injection molding for a number of different companies over the years including Plastech Corp. and Chemtech Plastics Inc. On March 11, Linder (, along with a partner, opened Inject Engineering LLC, located in Rockford, IL.

Linder’s philosophy has always been that molds need to be built from the molder’s perspective and he has made this the guiding business philosophy of Inject Engineering. “What we’re doing is the engineering, and we’re engineering molds from the molder’s perspective rather than the moldmaker’s perspective—designing for optimum molding performance,” he explained. “Our approach to designing will be different than anyone’s in the industry.”

Using the customer’s 3D model and 2D drawings, Inject Engineering runs a mold filling analysis and material flow simulations, identifies the proper gating and venting, locates cooling lines, and performs some "what-if" scenarios to ensure optimum molding performance. By using computer analysis to optimize the mold for the molding process, he can predict the widest possible processing window so the mold can be designed to that. Linder also notes any discrepancies in the product’s design that might inhibit its manufacturability, collaborates with the customer to make changes....
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