Osirys - Newsletter - February 2015

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Osirys - Newsletter - February 2015

160°C 140°C 125°CCell structures of three extrusion foamed bio-polymer samples with varying die temperaturesbut slightly lower than the strength of hardgypsum board. The weight of this newsolution was approximately 3.5 – 4 kg/m 2 - approximately 2 to 3 times lower thantraditional gypsum board at 8.8 - 11.3 kg/m 2 .Bio-Polymer foamingIn OSIRYS, extrusion foamed bio-basedthermoplastics are being developed asa core for an internal insulation board.The research has up to now focused onthe optimisation of foam and processparameters in lab-scale extrusion foaming,and in initial trials using a pilot-scale tandemextrusion line. The biobased materials aredeveloped by TECNARO GmbH.In laboratory scale tests lignin-basedthermoplastic materials were foamed tofind preliminary processing parameters. Forthese bio-based materials, the optimumtemperature for successful foaming wasfound. The foam density reached 40-100kg/m 3 depending on the material usedand the process parameters. The foamstructures of selected samples are visiblein the figures above, showing a closed-cellstructure with mean cell size about 100 µmwhen a die temperature of 125°C is used. Athigher temperatures the density too high forour application.For the up-scaling of polymer foaming, apilot-scale tandem extrusion line owned byVTT is used. The trials so far have beendone using lignin-based thermoplasticmaterial and PLA. In the initial experimentswith PLA, a foam board with a thickness of10 mm, width of 70 mm, density of 60 kg/m 3 and average cell size of 500 µm wasobtained (see image below). Throughputin the experiments was 7.2 kg/h, and thedimensions can be increased by usinghigher throughput rate.PLA foam board structure in macroNewsletter Issue 1 - February 20157

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