Extrusion International 5-2020

26 Extrusion International 5/2020 PIPE EXTRUSION Developed on the basis of the VENUS monolayer concept, Tecnomatic currently has a full range of die-heads withmulti helical spirals, for the production of two, three or four lay- ers polyolefin pipes, even for large diameters, building on years of experience supplying reliable and high performing lines for multilayer pipes. A recent delivery of a line to Au- thentic Production in Myanmar for the production of multi- layer pipes up to 630mm shows that the Asia Pacific market is embracing innovations that may provide higher levels of performance. Authentic Production, part of the Authentic Group of Com- panies, which started its PE pipe production several years ago, has rapidly gained market share and reputation be- cause of its focus on quality. They benefited from running Tecnomatic lines capable of producing pipes up to 1,200mm that offered production efficiency, reliability and reduced scrap rates when producing their recently launched multi- layer product. The new product featured the BorSafeTM HE3494-LS-H PE100 High Stress Crack Resistant (HSCR) mate- rial in the outer layer to offer their clients maximum security against point loads and surface damage that may occur dur- ing installation. Such multilayer pipes have been used extensively in Europe for installations either using trenchless techniques or where no imported backfill is used. By using the same material dug from the trench, the installers were able to reduce the costs and environmental impact of bringing sand or other backfill materials to the site. HSCR PE100 pipes can now offer con- tractors and installers such options in Asia as well. The wall of the multilayer pipe produced by Authentic Pro- duction is made up of two layers equal to 10 % and 90 % of the total thickness. The outer layer is produced from HSCR PE100 material and the core from standard PE100. This re- quires two separate extruders, whichwas achievedby amain extruder from the ZEPHYR series in L/D 40, which offers ex- treme output performance and lower melt temperature and energy consumption, while the inner layer is produced from an ATLAS series in L/D 30. Both extruders are synchronised By Dr. Massimiliano Vailati (Tecnomatic SRL) The market for polyolefin pipes is constantly evolving withmore demanding customer and application requirements. Despite the constant improvement in polyolefin properties, single-layer solid wall pipes are still not able to always fulfil certain customer or application requirements. For such situations, multilayer pipes may be a solution. The key to producing a goodmultilayer pipe is the die-head. In this article will be showcased how Tecnomatic, a leadingmanufacturer of processing equipment for polyolefin and PVC pipes based in Bergamo, Italy continues to improve the technology and performance for the production of complex multilayer pipes with functional layers Innovation and Enhanced Performance in the Production of Multilayer Pipes Co-extrusion of HSCR PE100 using a coating die head on a standard PE100 pipe Multilayer 1200 mmOD PE100 with HSCR outer layer pipes being welded inMyanmar