Summary: Increasing environmental concern encourages the development of new ways to recycle medical products. Post‐consumer medical products are suited for recycling because of their life‐span, but used products have to be disinfected before recycling. Therefore, the influence of different disinfection processes during recycling on the processibility and the mechanical properties of thermoplastics was investigated. As disinfection processes, steam disinfection and disinfection with electron beam and gamma radiation were selected. The characterisation of the properties of disinfected recyclates was undertaken for PE and PP from syringes. The melt mass‐flow rate (MFR), the dynamic mechanical properties, the tensile properties and fracture mechanics parameters were examined. A comparison of the results showed that stiffness and strength remain nearly constant, but the deformation and fracture behaviour tends to be influenced. The selection of appropriate disinfection parameters can avoid unnecessary alteration of the properties. Thus, steam disinfection as well as radiation disinfection up to a dose of about 25 kGy are suited for decontaminating used medical products.Scheme of the influence of different disinfection methods on selected properties of thermoplastic recyclates.magnified imageScheme of the influence of different disinfection methods on selected properties of thermoplastic recyclates.
A multi-axis WEDM technology is currently developed with an industrial consortium. To achieve this advanced application technology a CAM software and a machine prototype with an integrated two-axis round table was developed and first tests conducted. The assembly of the additional swing and rotational axis and the simultaneous steering with the machine axes enables the manufacturing of complex parts. But only in combination with the CAM software transforming complex shapes into NC programs for 6- and 7-axis manufacturing, the machining of complex geometries is feasible. At present, the technology is adapted to the manufacturing of medical parts from titanium alloys and CoCr alloys. First results of the machining of an involute gear will be presented.
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