At NPE 2006, Engel displayed an all-electric tiebarless machine that produced a two-cavity, two-component cover plate. This E-MOTION 110 Combi US molds parts from Liquid Silicone Rubber (LSR) and polybutylene terephthalate (PBT). After the in-line injection units inject the PBT, the second piggyback-mounted units inject the LSR. In addition to the multi-component advantages of new design possibilities, reduced cost and improved quality from the single-step process, the electric approach adds other benifits. "In general, if we compare an all-electric injection molding to hydraulic, the biggest advantage is efficiency, be it multi-component or single component is about 30 to 40 percent less," says Engel's Kragl. In addition, the all-electric machine reduces the noise level by as much as 10 to 15 dB compared to a hydraulic machine.
Most machine design engineers will survey existing component manufacturers for standard linear guide products, limiting what they can do with their designs. Using extruded aluminum profile guides can customize machine designs while shrinking the bill of materials.
Practically all electronic devices today contain metals that may
be coming from conflict-ravaged African countries. And political pressures will increasingly influence how these minerals are sourced and used in products.
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