Gardner Business Media

Hot Runner Technology OCT 2017

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F E AT U R E 18 Hot Runner Technology we were comfort- able putting back into the process. We were generating a lot of regrind and dust, which trans- lated into increased maintenance on grinders and dryers. We really wanted to get rid of the mess and the cost associ- ated with it." To address this problem, Retlaw and Osco worked together to retrofit a single-cavity mold with the latter's Multi-Gate Nozzle (MGN) technology. The pulleys had six gating points on the three-plate tool. Peter Rebholz says, "In initial discussions with Retlaw's engineering team, the team said it wanted six points of injection on the hot run- ner system. That's perfectly logical. I thought we would be able to produce a well-balanced part with only three gates, which will also keep the expense down. As it turned out, three in- jection points gave everything to Retlaw that it wanted. So, when we went into the multi- cavity tool, we were able to keep the hot run- ner cost down and the controller cost down." Osco's MGN provides a balanced feed to each gate and minimal residence time within the hot runner. Offering temperature control at multiple gates, MGN has been shown to be effective especially when molding "round parts that need to stay round," Rebholz says. For Retlaw, the MGN is furnished with carbide tips. This is important because glass-filled nylon tends to run hot, and it tends to be abrasive. In its collaboration with Osco, Retlaw's next step was to build an entirely new tool around the hot-runner technology. The tool is equipped with inserts, which enable the pulleys to be molded in a variety of sizes, diameters, wall thickness and configurations. CEO Mark Eberhardt says that Retlaw inserts mold pulleys in fully-automated molding cells, such as the one shown here.

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