By Smithers Rapra

Smithers Rapra's the world over well known Blowing brokers and Foaming techniques convention will ensue in Mainz on 14-15 might 2013. Now in its 15th yr, this convention has been firmly proven because the most excellent occasion for these fascinated with the formula and alertness of blowing brokers and methods to supply extended or foamed polymer substrates. this day there are lots of ideas on provide - new tools, resins, know-how, strategies and ingredients and it appears call for for better functionality and decrease expenses is decided to once more force technical advancements in polymeric foams. This occasion grants these all for the manufacture of blowing brokers, PU foam insulation and packaging, foam extrusion and gear manufacture a first-rate chance to determine what is fairly occurring during this region.

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The screw design is dedicated to a physical foaming process including a compression section for injection of gaseous blowing agents and cut outs for extruder pins. To determine the influence of high and constant process pressures on profile quality and cell structure, the extrusion line is extended by two gear pumps and a pressure tube. The experimental set-up is shown in Figure 3. Page 3 of 10 pages Paper 6 - Sitz 14-15 May, 2013 – Mainz, Germany extruder with Extruder mit Gasinjektion gas injection Blowing Agents and Foaming Processes 2013 pressure Druckrohre tube mit with stat static .

Primary objective of further investigation will be the influence of processing parameters such as barrel and die temperature and screw speed as well as the influence of material parameters such as type and velocity of curing system. Page 9 of 10 pages Paper 6 - Sitz 14-15 May, 2013 – Mainz, Germany Blowing Agents and Foaming Processes 2013 ACKNOWLEDGEMENTS The research project 17510 N of the “Forschungsvereinigung Kunststoffverarbeitung” has been sponsored as part of the "industrielle Gemeinschaftsforschung und -entwicklung (IGF)" by the German „Bundesministerium für Wirtschaft und Technologie (BMWi)“ due to an enactment of the German Bundestag through the AiF.

The use of nucleating agent enhances this effect of cell size reduction slightly. The silicone rubber material including nucleating agent shows a cell size reduction of 52 %. At the same time, the overall cell density is increased with higher amounts of blowing agents. For the material with nucleating agent, the cell density increase is stronger (70 % higher increase), as can be seen in Figure 8. Paper 6 - Sitz Page 6 of 10 pages Blowing Agents and Foaming Processes 2013 14-15 May, 2013 – Mainz, Germany Figure 8 – Influence of the amount of blowing agent on the cell density The cellular structures with smaller average cell sizes and high average cell densities can be considered as fine cellular structures.

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