Patent Report: Toggle lever boosts cycle times
A patented design for the actuation of the toggle lever results in fast cycle times in the Elios 6500 and 7500 injection molding machines, which Netstal-Maschinen AG, Näfels, Switzerland, introduced at the K show.
“Due to the clever combination of a dynamic electro drive and a powerful hydro-mechanic assistance system, a high movement speed can be reached even with high clamping forces,” said Marcel Christen, Netstal’s head of product management.
The dry cycle time of 1.9 seconds makes the Elios 7500 the fastest machine in its size class, according to Christen.
The toggle lever is aligned in a central position to ensure optimum force in the center of the mold installation space. Netstal said that the uniform distribution of clamping force prevents deformation of the mold plates.
Energy generated during braking is converted into hydraulic energy and stored in the electric motor of the main drive. “Because the energy generated in this way can be reused in the overall system immediately, energy savings of up to 50 percent can be achieved compared to a fully hydraulic machine, even during full-load operation,” Christen said.
The new clamping unit has an opening stroke of almost 3.3 feet. Models with clamping forces of 450 and 550 tons are scheduled to be introduced next year.
In total, customers will be able to choose from 33 combinations of clamping units, injection units and screw diameters. The Elios machine running at the show was molding 2.8-gram PP domed lids in a cycle time of 3.9 seconds.
German Patent Application DE201510109840; issued July 21
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Patent Application 20160332345; published Nov. 17
In-mold treatment. PolyOne, Avon Lake, Ohio, and Merck KGaA, Darmstadt, Germany, are jointly commercializing a technology to create 3-D imagery on packaging and electronics products in a process called IM3D. A 3-D impression is created in a single step during the injection molding process.
Patent 9,376,622; published June 28
Hot runners. A new self-balancing hot-runner technology uses independent flow and pressure control for molding two or more parts with more than a 50 percent difference in weight or form. It can also handle identical complex-shaped and intricate plastic parts at the same time.
Patent 9,492,959; issued Nov. 15