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Patent Report: Toggle lever boosts cycle times

Issue: January 2017

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.

Doug Smock

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

In other patent news:

Extrusion. A group of inventors in São Paulo, Brazil, received a patent for a special extruder that gives compounds of plastic and waste biomass, such as rice husks, greater mechanical resistance to weather and insects. Dehumidified particles are heated and then cooled in a compactor screw with several thermal zones. The extruder can make compounds that are 20 to 70 percent fiber by weight and that include colorant and anti-UV additives.

Patent 9,486,808; issued Nov. 8

Reaction molding. Hilti AG, Schaan, Liechtenstein, invented a reaction injection molding technology for production of parts that swell when heated, creating a seal. A compound composed of intumescent powder additives, glass fibers and a reaction plastic such as thermoset polyurethane is molded in a proprietary system to make products such as foams. The machine has a multicomponent blending and dosing system that includes a mixing head with a mixing chamber. The glass-reinforced foams are designed to meet U.S. fire-hose-stream test standards and are used in construction applications.

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

Patents and patent applications can be viewed at www.uspto.gov
Have you applied for or received a patent? Contact dsmock@plasticsmachinerymagazine.com