In developing the new system, the two companies began with the assumption that thermocouples alone don't truly measure the melt-stream temperature. 'The real wild card here is the material itself,' Yazbak says. The system also yields information on another important variable as well: material variations. Users can then harmonize current operating conditions with the optimized ones by manipulating processing variables such as injection speed, temperature settings and nozzle pressure. By overlaying the current and optimal curves on the same screen, the system provides a basis for comparison. At the same time, the IBED stores a 'golden curve' representing the optimal processing parameters. Yet there's often a false assumption that this machine metal temperature is the same as the melt temperature.' What's more, melt temperature may provide a more sensitive characterization of the molding process than pressure because the former changes with both compression and shear, Yazbak says.įor now, the system works as a real-time monitoring tool with MDH's IBED machine controller processing and displaying the melt-temperature signal from Dynisco's MTX probe. 'Most people only focus on temperature control of the mold barrel and nozzle' Yazbak explains. Under the new sensing system, temperature and pressure control for machine and mold remain as crucial as ever, but they don't paint the full picture of a shot. Last month, the two companies unveiled the hardware and software developments needed to sense small-scale melt temperature movements and then display them graphically as unique curves.Įach of the melt-temperature curves or 'thermal portraits' recorded by the Dynisco/MDH system corresponds not only to the process and material variables from an individual shot but ultimately to final part characteristics as well, according to Dynisco marketing manager Gene Yazbak. of Sharon, Mass., and Mannesmann Demag Hamilton (MDH), the British arm of the German machinery supplier.

The first commercial machine monitoring system employing the new sensing technology grew out of experiments conducted over the past two years by Dynisco Inc. Measured by a new infrared sensor, this once-hidden temperature information promises answers to fundamental questions about the many variables affecting final part quality. Retrieved from Ī novel approach to injection molding control has been built around subtle but informative thermal changes in the melt stream as it leaves the nozzle. APA style: Nozzle melt temperature reveals molding quality.Nozzle melt temperature reveals molding quality.' Retrieved from MLA style: 'Nozzle melt temperature reveals molding quality.' The Free Library.

The dynisco injection molders handbook