The series Helical uses the technology of the same patented name which consists of a grooved extruder with two main differences. It uses a monobloc barrel and the grooves are present on nearly its whole length. These grooves are arranged helical. This technology appeared in the beginning of 2000 and combines the advantages of the smooth and the grooved extruder, namely an important specific flow volume and a large universality considering the different polymers. The Helical extruder is longer than the extruder of the other series and they are coupled systematically to screws so called barrier screws. This series exists in different Versions: C version for the coextruder- mobile machines, U for the principal extruders, so called universals extruders, and P for the principal extruders for polyolefine.