Extrusion International 5-2020

27 Extrusion International 5/2020 Tecnomatic SRL Via Emilia, 4 – 24052, Azzano S.Paolo (Bg) Italia https://tecnomaticsrl.net using gravimetric feed on each extruder to maintain a con- tinuous raw material feed and to record variations in mass throughput, thereby ensuring perfect control of the weight per meter and wall thickness distribution. The VENUS MULTI pipe head series have been designed to achieve excellent processing using a wide range of materials at very high output. The spiral geometry has been optimised for the latest generation of PE and PP raw materials, while achieving improvements in reducing its overall length, vol- ume andoperatingpressure. The heart of theVENUSMULTI heads consist of an innovativeflowchannel geometry,which has been calculated to take into consideration the current raw materials. This geometry ensures the same behaviour for pressure anddistributionof themelt, in all the pipe heads in the range even at very high output rates. This new feed- ing system, as well as for the matching ranges and the small die sets contributes to the reducedworkingpressure. This re- duces the energy consumption during extrusion since up to 10 % of the extruder power is usually required for pumping capacity. Lower pressure results in a lower melt temperature and together with lower residence times ensures improved pipe characteristics such as its OIT (oxidation resistance) and reduction of thermal and sheer stresses. Authentic Production has expressed a high degree of satis- faction for the quality of the multilayer line since its commis- sioning. Thenewproductwill offerprojectowners additional security for pipelines that are installed in demanding condi- tions. Additional features can be added to the pipe such as a peelable outer skin, which provides further economic and environmental benefits for water and gas distribution pipelines. This peelable outer jacket, frequently made from specially modified polypropylene, further protects the pipe surface against potential notches and cracks when using installation methods such as pipe bursting or wash-boring. Potentially deep scores in the protective jacket will not be transferred to the inner pipewhen it is eventually exposed to service-related stresses. The peelable jacket that is adhered to the outer wall of the core PE pipe is typically 0.6 to 0.7 mm thick for all current di- mensions of this newmulti-layered pipe and the skin is add- ed by a cross-head positioned before the last cooling bath. Tecnomatic has a full range of die-heads, based on spiral or radial technology suitable for plastic or metal pipes coating ranging from 5 to 800 mm and up to 4 layers. The die-heads are based on a typical spiral technology for large and single layer co-extrusion or amixed solutionwith radial distributors or short path spiral alternative depending on material char- acteristics such as PA, EVOH, PVDF or adhesive bonds. ELEKTROWÄRMETECHNIK FRANZ MESSER GMBH ERGE Elektrowärmetechnik - Franz Messer GmbH 91220 Schnaittach - Hersbrucker Straße 29-31 Tel. +49/9153/921-0 Fax +49/9153/921-117 www.erge-elektrowaermetechnik.de mail: verkauf@erge-elektrowaermetechnik.de HEIZEN TROCKNEN REGELN CONTROLLING HEATING DRYING M.H. Aung, Authentic and Dr. Massimiliano Vailati, Tecnomatic VENUS 630 die-head spiral distributor