At NPE2012, Sumitomo (SHI) Demag introduced the ultrahigh-speed El-Exis SP hybrid injection press to the North American market, with two presses molding thin-wall packaging, and rolled out its new SL screw on a micromolding application.
Two other machines showed off Sumitomo Demag's new direct-drive all-electric line of SE-EV presses.
And for the first time, the company showed off its ability to remanufacture used equipment at its facility in Strongsville, Ohio, by displaying three machines — a 1993 Milacron Vista, a 1992 Sumitomo and a 1989 Van Dorn. Sumitomo Demag retrofitted all three machines with the VDU controller, the Van Dorn Universal.
The Norcross, Ga., firm brought 12 machines to the first NPE in Orlando — 10 at its own booth plus two more presses at other exhibitor booths. The machines covered applications for consumer goods, automotive, thin-wall molding, in-mold labeling and liquid silicone rubber.
The SL screw has no compression zone, so it eliminates black spots that can result from the pocket of stagnant material that can built up in that barrel zone, carbonize and break free to enter the mold, Sumitomo said.
The shorter screw eliminates shear heating instability, said Jim Mitchell, Sumitomo Demag's executive vice president.
SL stands for Spiral Logic, designed by Spiral Logic Ltd. of Hong Kong, which makes the T-Rex screw assembly, including screw and barrel. The SL screw assembly is standard on the new SE-EV series of all-electric presses and as an option on the direct-drive all-electric, the SE-DUZ.
In Orlando, an SL screw and barrel ran on an all-electric SE50DUZ with 55 tons of clamping force that molded a barb stop used during a colonoscopy to remove polyps. The part, resembling a tiny bobby pin, weighs just 0.0772 gram and is made from Ultem polyetherimide.
Indiana micromolder Makuta Technics Inc. molds the part for US Endoscopy's iSnare sytem. The barb stop has two finely barbed legs and a tiny hole in the top. It helps control the needle used for injecting drugs, dye and cleansing solution into the polyp.
The SE-DUZ also showed off some other features. Flow front control ensures complete, consistent filling by optimizing the flow front, while maintaining low-pressure filling and reduced clamping force. Sumitomo Demag calls the process Z-molding. Also, the direct-drive motors provide high speeds, pressure and torque.
Two El-Exis SP presses got a workout in Orlando. A 220-ton SP ran a Marbach full-cover IML on an oval polypropylene container at a three-second cycle. The full-color label can also provide barrier-layer functions. The Marbach process inserts the banner and base label in a single stroke.
The second El-Exis SP molded lightweight water bottle caps on a 96-cavity Sch"ttli mold with a cycle time of 1.9 seconds, or more than 150,000 caps an hour.
The SP machines combine a hydraulic accumulator with servo valves for very high speeds of up to 1,000 millimeters per second, an energy-efficient servo-electric motor for plasticizing, and servo drive and hydrostatic transmission for clamping.
Sumitomo Demag said the El-Exis SP offers up to a 30 percent increase in injection speeds over the predecessor El-Exis S — the machine introduced at the NPE show in 2009. The SP is up to 30 percent more energy efficient than competing high-speed hybrids, the company claims.
El-Exis SP presses range in size from 165-825 tons.
Sumitomo Demag was created in 2008 when Japanese press builder Sumitomo Heavy Industries Ltd. bought Demag Plastics Group of Germany. The SE-EV all-electrics combine Japanese and German technology, Mitchell said.
On the Orlando show floor, a 198-ton SE-EV molded pour spouts for laundry detergent on a Stackteck four-cavity mold, running a 7.5-second cycle. A Ritemp evaporative cooling system from Mold-Masters Ltd. is built into both the hot half and cold half of the mold, reducing cycle.
In a medical application, a 110-ton SE-EV ran 32 PP pipettes at a time on a 6.5-second cycle.
Sumitomo Demag said the SE-EV consumes 20 percent less energy than previous all-electrics because of Sumitomo-built motors with low rotational resistance, decreased fiction in the linear guides and bush-less tie bars, a heat-efficient barrel and a new toggle linkage lockup mechanism that uses no electricity to hold the clamp closed.
At the NPE booth of Zeiger Industries, an SE-DUZ press was running, equipped with Zeiger's LSR conversion kit.
The show ran from April 1-5.