Plastics Technology

AUG 2018

Plastics Technology - Dedicated to improving Plastics Processing.

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are eighth-generation vertical electric presses with a rotary table. The MDVR S-8000 series runs from 55 to 165 tons. Both use the new S8000 control with a larger screen and remote monitoring capability—including the Factory View dashboard providing a quick look at production counts and other data. This controller also permits remote service and troubleshooting, and it can send email alerts of alarms or notices when it's time for scheduled maintenance. Controls for hot runners and TCUs can be integrated with the machine controls, so all three can be set up automatically as part of the mold recipe. Yizumi-HPM introduced its latest series (FE-N) of all-electrics from 65 to 290 tons. The company is working on a 360-tonner, which it expects to introduce by the end of the year. Sumitomo (SHI) Demag Plastics Machinery North America (sumitomo-shi-demag.us) demonstrated some novelties on its latest SEEV-A all-electric presses. One was a new automated color-change system from CAM Co., Ltd. of Japan. The Pigmic color feeder uses a metering disc—a variable-speed rotating plate with holes to let the powdered colorant fall through—to dispense colorant into a feeding tube that extends deep into the feed throat so that only the resin in the barrel is exposed to colorant. The programmable unit changes colors prior to the last shot of the previous color and begins feeding the next color. A color-definition camera works together with the Pigmic unit in a closed-loop feedback manner to determine when the color change is complete and reject all intermediate parts. This system reportedly saves labor by automating the color-change process and saves time and material by shortening color-change times. What's more, the camera system works between color changes to ensure color consistency and adjust color feeding as needed. About 17% lower color usage is said to result from such optimization. On a 130-m.t. SEEV-A machine, Sumitomo Demag demon- strated its relatively new S-Move software for speeding clamp closing in complex molds with deep draws and many slides or motions. The system molded 1-ml PP medical pipettes (0.87 g each) in a 32-cavity hot-runner mold in 7 sec. S-Move replaces multi-step mold open/close speed profiling with an optimized profile that is both smoother (less vibration) and 15% faster by eliminating unnecessary steps, the company says. This is possible because the control "learns" where high contact force occurs relative to mold position. Then it can close the mold much faster, while "thinking ahead" to anticipate those critical points and decelerate appropriately. S-Move reportedly auto-tunes clamp speed and ramp speeds within two or three cycles. Another new software feature—variable accumulator loading—was demonstrated by Sumitomo Demag on its super- high-speed El-Exis SP 300 hybrid press. It molded 72 HDPE still- water caps (26/22 mm) with tamper-evident band in 1.8-1.9 sec, though the system is said to be capable of 1.6-1.7 sec cycles. To save time, the system starts injection before the mold is fully locked up, almost like injection-compression molding. The new feature adjusts accumulator charging to provide only what the process requires, for a reported 10-15% energy savings. NEWS IN CONTROLS & MES Arburg (arburg.com) provided more details on its new controls. Two machine sizes, the Allrounder 920 H and 820 H (550 and 440 m.t., respectively) have been converted to the new design intro- duced with the 1120 H (650 m.t.). The 920 H is currently available, the 820 H is coming in October. An option on these two machines is the new Gestica controller that's standard on the 1120 H; stan- dard configuration is with a new design of the Selogica control, dubbed Selogica ND. The main difference is that the Gestica con- trol embodies the look and feel of smart mobile devices. The company also has introduced six optional "digital assis- tance packages" for users of Selogica and Gestica controls. The first of these is not actually a new capability; called "4.set-up," it provides guided step-by-step setup assistance for inexpe- rienced operators. Another is the new "4.start-stop," which is said to simplify and shorten times for production startup in complex applications, such as with multi-component and hot- runner molds. It provides a guided filling study for a new mold. Simulation of filling will be added to the machine control in the future. "4.optimization" is designed to enhance part quality with features for customized process and efficiency optimiza- tion, such as injection during mold closing, dosing across cycles, and extended mold-locking functions. Future enhancements will include screw-position-controlled injection for hydraulic presses—already available for all-electrics. "4.production" offers experienced operators greater flexibility and freedom in programming functions for special processes and 38 AUGUST 2018 Plastics Technology PTonline.com NPE WR AP-UP New powdered-colorant feeder from CAM Co. in Japan was running the Sumitomo Demag booth. Teamed up with a color-sensing camera, it is said to speed color changes and to maintain color during production, with up to 17% colorant savings.

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