Traditionally,most of the rubber mixes for the tire industry are produced in tangential internal mixers. The quality of the mixing equipment contributes in an important way to the quality of the semi-finished rubber profiles and further on to the performance of the tires. To enhance quality and to increase production output, manufacturers are always interested in optimizing process parameters and machinery equipment. The geometry of the rotors of an internal mixer is one of the key elements of the machinery equipment. The aim of the European research project rotor is to develop an innovative and optimized rotor geometry by the means of the numerical flow simulation, instead of a classical trial and error approach. At the end of the project an experimental validation of the newly developed rotors is done. In the present paper, the authors describe the results of experimental studies on a GK50 UK internal mixer. The old standard rotor geometry for tangential internal mixers (OS geometry) is compared to the newly developed rotor geometry (MD-SC geometry). The most important aspects of mixing, as dispersive and distributive mixing efficiency of the rotors, are discussed.

The article tries to examine Britain's place in EU's policymaking towards Iran. Having in mind the importance of the EU in international stages and also in economic and political matters, the following article has shed light on the ups and downs of Iran’s relations with the UK as one of the important EU-nation states and has concluded that an effective but careful and logical relationship with EU member states could expand the space of more collaborations and in this regard Iran can utilize EU’s capacities. Britain in contrary to the US has avoided military tools and has chosen a negotiating policy toward Iran and has assured other member states of these negotiations. Iran should choose a definite strategy towards EU based on having a complete knowledge of each member–state and their capabilities and special potentials in cooperation with Iran.

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