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get an accurate temperature. Some might think the thermocouple hanging from the thermocouple and heater-band electrical wire. must be in the melt, but that will not work. For a thermocouple to These wires should not be left to hang below the barrel; they provide an accurate temperature, I am told it has to be at least six should be routed on the side of the barrel out of harm's way. diameters into the melt. There is not enough room to do this. about the author Further there are more high-pressure machines being used—with John Bozzelli is the founder of injection Molding solutions (scientific 25,000 to 40,000 psi plastic pressures—and I am concerned Molding) in Midland, Mich., a provider of training and consulting about the safety of a hole drilled in the nozzle. services to injection molders, including liMs, and other specialties. To date, my best compromise is to frst clean up the nozzle body. e-mail john@scientificmolding.com or visit scientificmolding.com. Get all of the charred plastic, etc. off until you have a clean steel surface. Obtain a spade, also known as a butterfy thermocouple (see Fig. 1). Place this directly on the nozzle body, using some thermal paste to help with heat transfer. Placement should be one-third the length of the nozzle body back from the nozzle tip. For individual components or a complete turnkey system, Foremost offers the most Put it on top and wrap it with three or four extensive line of auxiliary equipment for materials handling available! turns of glass tape. The heater band goes Customized fully Integrated Plant Control Systems optimize the performance of individual Foremost over the spade. The heater band should components to assure high throughput rates, excellent quality and maximum profitability. cover as much of the full length of the nozzle body as possible, and ensure that it is the right voltage, 110V or 240V. Vacuum and Granulators Take another look at Table 1 to see the Pressure Loaders Configurations, sizes, before and after results of this technique. Self-contained, central and available features distribution and bulk developed in over 50 Fig. 2 shows the molder's setup before the loading components, years' experience; packages, and turnkey standard and custom fx, with a thermocouple on the heatersystems: 50- 50,000 configurations designed band clamp. Seriously, why do you buy a lbs./hr. conveying rates; to perform and built for pellets, powders, to last $50,000 to $250,000 piece of equipment granules, and flakes and then put up with Neanderthal temAccu-Trac Metal Detectors/ perature-control technology? Also note Multi-Component Batch Separators Weigh Blenders Ferrous and nonthat there is some plastic on the wire in Digital controls meter 2 ferrous; gravity Fig. 2. This is common, with globs of it to 6 components, and in-line pneumatic Only One Source Builds It All TaBle 2 — temperatures along accuracy of ±0.5%, throughputs up to 3,000 lbs./hr. of pellet and regrind separators; flat-pack and tunnel conveyor detectors; up to 20,000 lbs./hr. a 6-in. Nozzle body Press No. temp. Variation from Setpoint, ˚F Distance from Nozzle tip 2 in. 4 in. 6 in. 1 26 24 17 2 12 18 27 3 24 18 27 Series TTD Dehumidifying Dryers With PLC or standard controls 4 21 23 Model CFV Crammer Feeders Digital controls provide continuous feed of pellet/fluff regrind PLANT CONTROL SYSTEM AGITATED FILM HOPPERS GAYLORD TILTERS GRINDERS VENTURI BLOWERS FOR FULL SHEETS & STRANDS CYCLONE 19 BLOWERS VACUUM BARREL MIXER FILTER METAL RECEIVER SEPARATORS VACUUM RAILCAR LOADERS UNLOADER 5 6 9 24 6 35 16 45 7 15 14 25 8 41 47 55 9 11 30 36 10 191 199 31 For more information on any of our products, or on a complete system designed for your needs. contact Foremost — a single source solution. average 21 22 31 We Accept: MasterCard VISA GRAVIMETRIC BLENDERS SURGE BIN RAILCAR MANIFOLD P Box 10155 Fairfield, N.J. 07004 .O. (973) 227-0700 FAX (973) 227-7307 www.foremostmachine.com Plastics technology february 2013 21