Foam Industry features used mostly traditional screws for Tandem Extruder system for manufacturing foam products such as for example foam sheets for packaging and insulation foam boards. Traditional screws have been developed over the years typically by Extruder manufacturers beneath the secrecy arrangement with foam manufacturers. With the progress of high performance screws for non-foaming fabricated product industry, foam industry can take an advantage of benefits in terms of improved product improvement, efficiency, and energy preservation. Comparison of Standard or perhaps general or traditional goal screws vs. High Performance screws, especially Energy Transfer screws can be attempted with engineering analyses of typical run data plastic recycle machine for XPS production should be presented. This presentation is well prepared in the memory of late Professor Marino Xanthos who offers focused on establish the methodology and fundamentals in understanding blowing agents interaction with resins which range from commodity PS, PE to polyesters, PBT and pet. Beyond what Prof. Xanthos possesses tried, we have instrumented the pilot line 90mm/120mm Tandem Extruder system in manufacturing facility to obtain the processing info, for XPS Polystyrene production in real production situation, temperatures, pressures, heating fluxes, and energy usage. The ET screw

found in the first extruder provided lower melt temperature compared to the standard screw which allowed to run the line at higher rate and the VBET screw used in the next cooling extruder also provided better cooling to provide the proper PS-BA mixtures, with acceptable foam density then.

Pressure transducers were installed in strategic indicate monitor the pressures in the barrel to prior to the injection of blowing brokers, before and following the mixing section and the final end of the first extruder. Another PT was installed in the linking Tube and 4 considerably more PT's were set up in the second cooling extruder. So as to monitor heat transfer in the barrel the secondary thermocouples (TC) were mounted. In each heating system zones, there have been TC's installed already, as a result new holes were drilled to install the next TC's for both

extruders as shown in Shape 2 schematically. This setup enables to analyze heat transfer within the barrel as follows.