Extrusion International 4-2023

36 Extrusion International 4/2023 PLAST 2023 Extrusion Processes Contrex is an Italian company of the Moretto group. It is specialized in the design, development and production of extrusion control sys- tems, focusing on cooling rings with thermal modulation and integrated thickness control, supervision sys- tems with OPC-UA communication protocols for blown film extrusion processes. Contrex has a strong experience based on over 40 years of interna- tional experience and it is the ideal partner for all flexible packaging producers. The company counts on a highly qualified professional team who offers application and process consultancy in all transformation phases – from storage logistics to distribution of raw materials within the production department – recom- mending the best solutions for each extrusion process. PLAST fair will be the occasion to present the best solutions for blown film extrusion to the international market. First of all, Gramixo, contin- uous loss-in-weight batch blender, able to handle up to six components. The free weighing inclined mixer ensures proper mixing of all ingre- dients. Extreme dosing precision is guaranteed by the exclusive double eyelid shutter device that allows dos- ing control in just 25 milliseconds; a reaction time ten times faster than traditional systems on the market. Thanks to the VIS (Vibration Immu- nity System), a special control algo- rithm that identifies and smooths out dosing peaks caused by system vibrations, Gramixo can be installed directly on the extruder with the certainty of keeping the weight per meter ratio set constant throughout the process. The supplied 10’’ touch view control with icon-based inter- face allows an easy and intuitive management of the dosing process. Exposed also Graviko, continuous loss-in-weight multicomponent dos- ing system with automatic weight/ meter adjustment that can be in- stalled in all 24/7 production plants (films, tubes, profiles or sheets in mono and co-extrusion). An accu- rate, self- adaptive dosing system designed to handle up to six com- ponents allowing a large number of configurations. It can dose and keep constant over time even the lowest weights thanks to specifi - cally designed dosing units. It is easy to program thanks to the 22-inch touch view control that allows fully automatic management of the pro- duction parameters at all stages of the production process. Graviko verifies that the doser adapts to the performance and the result of the finished product. It controls the ex - trusion process and acts on its speed through the thickness and/or dimen- sional control of the extruder. A real synchronism between doser, extrud- er, haul-off and finished product. Graviko is equipped with stainless steel hoppers and it is immune to vi- brations. Gramixo and Graviko are reliable, modular and user-friendly machines. In addition to dosing systems, the Contrex range includes also the effi - cient Discovery cooling rings avail- able in two versions: the one with a cooling insert and the second one with fully auto- matic sectoral thermal mod- ulation that allows precise thickness adjustment thanks to its unique design. Discov- ery generates different air flows to ensure the right point-to-point thickness adjustment and increases cooling efficiency with reduced en - ergy consumption. The cooling flows in combination with the thermos- regulated sectors enable proper blown support and consistent gauge control along the entire circumfer- ence, offering a substantial increase in productivity. Navigator 9000 allows an easy management of the discovery cool- ing rings. It is a control system that supervises the production param- eters through a simple, intuitive and user-friendly interface, speeding up the creation of new recipes and ma- terial changes, while reducing start- up and production changes. Contrex srl www.contrex.it PLAST 2023: Hall 22, Stand A81/B82 GRAMIXO, continuous loss-in-weight batch blender Cooling ring DISCOVERY GRAVIKO, continuous loss-in-weight multicomponent dosing system