André Wieczorek

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Capillary rheometry simulates polymer extrusion in a simplified way. It allows the characterisation of polymers by means of determination of the viscosity function and extrudate swell. As regards viscous properties, there is still a lack of constitutive characterisation of rubber blends. In this contribution new concepts are presented how the viscous(More)
The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear flow behaviour of elastomers. Thus, the design of injection heads is carried out with subject to the used rubber blend, whereas the geometry of the appropriate profile is achieved by empiric adaptation of the extrusion die.(More)
The numerical dimensioning of injection heads and tools for the extrusion of rubber profiles requires both, the experimental investigation and numerical consideration of the viscoelastic material behavior. Usage of finite element software allows drastic reduction of a time-consuming empiric adaptation process for the design of extrusion tools. In this(More)
The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear viscoelastic flow behavior of elastomers especially of the so-called die swell. Thus, the design of injection heads is carried out with subject to the used rubber blend, whereas the geometry of the appropriate profile is(More)
The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear viscoelastic flow behavior of elastomers. Thus, the design of injection heads is carried out with subject to the used rubber blend, whereas the geometry of the appropriate profile is achieved by empiric adaptation of the(More)
During rubber profile extrusion unvulcanized rubber blends are pressed through a jet with specified geometry. For that purpose the raw material is melted and homogenized in a screw extrusion press due to heating and internal friction. Before the extrusion tool is reached the melt is heated within an injection head onto the desired temperature. The(More)
Investigations on operation of the power supply for the auxiliary system of the fusion power plant were made using the SIMPLORER, EFFI and NEPLAN codes. The new approach was to use an additional 80 MW, 1.2 GJ energy storage unit with the magnetic confinement system (superconducting magnet system, multiconverter unit and STATCOM) as a SMES to reduce network(More)
Shape Memory Alloys (SMA) using elastocaloric cooling processes have the potential to be an environmentally friendly alternative to the conventional vapor compression based cooling process. Nickel-Titanium (Ni-Ti) based alloy systems, especially, show large elastocaloric effects. Furthermore, exhibit large latent heats which is a necessary material property(More)
This contribution gives an overview about new procedures for the parameter identification for the material characterisation of rubber blends. They are based on a Newton-Raphson procedure and a genetic algorithm. As basis serves an experimental investigation of the viscous properties of rubber blends by means of a capillary-viscometer. Because of(More)
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