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 by Extruder manufacturers under the secrecy agreement with foam manufacturers mostly. With the progress of powerful screws for non-foaming fabricated sheet extrusion line product industry, foam industry may take an edge of benefits when it comes to improved product improvement, efficiency, and energy saving. Comparison of Common or traditional or general purpose screws vs. POWERFUL screws, especially Energy Transfer screws is going to be attempted with engineering analyses of usual run data for XPS production should be presented. This display is prepared in the memory of late Professor Marino Xanthos who contains focused on establish the methodology and fundamentals in understanding blowing brokers interaction with resins which range from commodity PS, PE to polyesters, PBT and pet. Beyond what Prof. Xanthos provides tried, we've instrumented the pilot line 90mm/120mm Tandem Extruder system in manufacturing facility to get the processing data, 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 temp than the standard screw which allowed to run the line at higher level and the VBET screw found in the second cooling extruder also provided better cooling to provide the proper PS-BA mixtures, with acceptable foam density then.
Pressure transducers were installed at strategic indicate monitor the pressures in the barrel to prior to the injection of blowing agents, before and after the mixing section and the finish of the first extruder. Another PT was mounted in the connecting Tube and 4 considerably more PT's were installed in the second cooling extruder. So as to monitor heat transfer in the barrel the secondary thermocouples (TC) were installed. In each heating system zones, there were TC's installed already, therefore new holes had been drilled to install the second TC's for both
extruders as schematically shown found in Figure 2. This setup enables to analyze heat transfer within the barrel the following.
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