LEADING IN TECHNOLOGY FOR LARGE-VOLUME COEXTRUSION BLOWING PROCESSES RIKUTEC (Altenkirchen) is an innovative and internationally oriented company in blow moulding technology. A core area is the development, project planning and series production of technical blow-moulded HDPE products for industry and retail. The cooperation between mechanical development know-how and the search for customer-oriented problem solutions created the think tank for future-oriented, market-driven and innovative development and production of technical blow-moulded parts. THE RIKUTEC COEX TECHNOLOGY The basic feature of the intermittent blow moulding coextrusion process is that the extruded melt is stored in the accumulator under constant pressure and temperature. This causes, amongst other things, optimal adhesion of the individual layers to each other. In contrast to the continuous coextrusion blow moulding process, the Rikutec process produces multi-layered hollow bodies with article lengths of up to 5 m due to the relatively short ejection time with uniform temperature control of the melt preform. REDUCTION OF MATERIAL COSTS The Rikutec coextrusion technology offers significant cost reduction through reduced material usage. The wall of the product can be built according to requirements. For example, the inner and outer layers of unprocessed material with high molecular weight and the intermediate layers of cost-effective recyclate can be combined. This also makes the Rikutec COEX technology very environmentally friendly. The advantages of the RIKUTEC coex process The controllability of the process is extremely effective. For example, the individual layer thicknesses are set exclusively via the corresponding extruder speed. The adhesion of the layers to each other is optimal due to the length of the melt guides. After merging the individual melt layers in the coex-piston, the coex-melt sits for at least the duration of an ejection cycle in the storage space, which provides the melt pressure and the melt temperature with a very favourable effect on the adhesion of the layers to one another.