NPE2018 Show Daily - Friday

NPE is truly ‘Breaking the Mold’ as a multifaceted experience, with activities, discoveries and opportunities to satisfy the needs of anyone who works in the plastics industry or has a need to know about plastics

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FRIDAY N PE 2 018 M AY 11T H Yizumi-HPM's Bill Flickinger to Retire; Company Plans Tech Center Expansion By Matthew H. Naitove Plastics Technology William (Bill) Flickinger joined the former HPM in 1968 as a project engineer. In the succeeding half-century, he has been a lead- ing technical expert in injection molding and die casting. He held wide-ranging responsibili- ties at HPM in engineering, operations, tech- nology and product development, application development, and senior management. Flick- inger was promoted to VP of engineering in 1974, VP of operations in 1986, and to presi- dent, CEO and chairman in 1993. He left HPM in 2001 to be president of Bivouac En- gineering and Service Co., a firm he co-found- ed that provided engineering, parts and ser- vices for HPM machines. He came back as president of the new HPM North America in 2011 after Yizumi Precision Machinery Co. of China purchased HPM's intellectual property. Bivoac was merged into Yizumi-HPM. Flick- inger retired as president of Yizumi-HPM in 2016 and remained as vice chairman and treasurer until this past March 31. Flickinger will continue to assist Yizu- mi-HPM on a part-time basis as vice presi- dent until Oct. 30. "This allows me to attend one more NPE exhibition and NADCA Die Casting Show," he says. Flickinger, a native of Marion, Ohio, grew up 15 miles from the original HPM plant. By a coincidence, Robert Lindsey, HPM VP of engi- neering, bought Flickinger's parents' home in 1968. That connection led to a job offer months later. 89 Tinius Olsen at NPE 215 675 7100 AUTOMATED SYSTEMS See the robot in action MELTFLOW MP1200 with Selectable Weight System VEM Video Extensometer Come and see us at Booth W723 Plastics Recycling Systems From Individual Components to Complete Systems • Wet Granulators • Friction Washers • Separation Tanks • Hot Wash Systems • Hydrocyclones • Mechanical Dryers • Thermal Dryers • PVC Label Removers Visit Booth W7545 for Complete Information Novel Injection Unit With In-Line Screw/Plunger Longstanding limitations of conventional reciprocating-screw injection molding ma- chines are addressed by the new Inject-EX system from Md Plastics, (Room W230-8). This injection unit, appearing for the first time at NPE2018, can be supplied with hy- draulic, hybrid, or all-electric drives. The all-electric version consists of a servo-driven screw connected in line with a plunger. The screw and plunger thereby move together as the entire injection unit reciprocates, driven by two servo motors and ballscrews mount- ed on either side of the unit. As explained by Michael Durina, presi- dent of Md Plastics, one well-known issue of conventional injection machines is incon- sistent shot volume due to variability in closing of the check valve on the end of the screw at the start of injection. Another issue is that as the screw retracts during recovery, pellets experience a continuously changing L/D so their shear exposure is inconsistent, which leads to melt-viscosity variation. That effect is exacerbated by the fact that when the screw moves forward during injection, pellets fall down from the hopper into the empty flights that are provided to fill the shot. Those pellets are not compacted efficiently, which creates an issue during recovery of the next shot by adding shear due to screw slippage and a pause in recovery time. The Inject-EX system solves the second problem because the screw (the company's Posi-Melt design) is stationary with respect to the feed hopper, which moves back and forth with the rest of the injection unit. Plastication of every pellet is therefore consistent, as in continuous extrusion, says Durina, even though this screw operates discontinuously. As for the first problem, there is a check valve at the front of the screw, where it tran- sitions to the plunger, but the valve is actual- ly the same design used in Md Plastics' Mini- Shut shutoff nozzles rather than its nonre- turn valves. This is a poppet valve that is spring loaded with Belleville washers. It therefore shuts immediately when the screw stops turning, not when it moves forward to inject. Melt passing through the valve is chan- neled through the center of the plunger until it reaches the front end, where it accumu- lates the shot in front of the plunger. To fill the mold, the entire injection unit moves forward, emptying the melt chamber in front of the plunger. Durina says this arrangement is both simpler and less costly than existing screw/plunger systems. What's more, the Inject-EX machine will use Md Plastics' exclusive Temp-Tek melt- temperature and pressure sensor. One sensor will be embedded in the melt chamber at the end of the plunger; another will be placed in the feed hopper. The first sensor will help ensure injection of a consistent mass of plas- tic, which is a function of consistent volume and density. The other will provide potential- ly valuable information about the tempera- ture of pellets entering the screw, Durina says. The new Inject-EX system on display in Room W230-8 operates as though it is performing continuous extrusion.

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