Extrusion 4-2019

D osing the exact quantity of material, maintaining a con- stant weight per meter ratio, creating process stability and knowing how to "pilot" the extruder are essential requirements to ensure high quality standards and eliminate any risks of hid- den costs and material waste. The extreme importance of the dosing phase in the extrusion process has led Moretto SpA, technology leader in auxiliary equipment for the plastic industry, to analyze the phenomenon linked to production and to develop innovative solutions cap- able of ensuring high dosing precision, flexibility and perfect mixing of the materials. A true record is the one achieved by GRAMIXO, the loss in weight doser which integrates the most advanced Moretto dos- ing technologies together with the experience of CONTREX, a company of the Group that boasts over 30 years of experience in the loss in weight for blow film extrusion. In fact Gramixo guarantees precision levels without equal: the flow rate devia- tions are less than 0.01 percent. The extreme precision is determined by the exclusive "double eyelid" mechanism that allows the release of the granule in just 25 milliseconds, a reaction time ten times faster than the sys- tems traditionally present on the market. An exclusive Moretto patent, the double eyelid device is tested for millions of cycles and is a standard equipment for Moretto’s batch gravimetric devices. Talking about flexibility, another important innovation develop- ed by Moretto, is the Vibration Immunity System, a special cal- culation algorithm that identifies and smoothes out any dosage peaks caused by the extruder vibrations. Thanks to this technology, and with the ability to control the towing and to operate retroactively on the set production tar- get, GRAMIXO can be installed directly on the extruder, thus ensuring high precision performance with the certainty to keep a constant weight per meter ratio throughout the process. Those involved in blown film extrusion know that they must be able to maintain a "constant" level of quality always com- pliant to the specific parameters required by the customer. They must provide them- selves with equipment which guarantee a safe and reliable process, free from possible and expensive production errors. 24 Materials Handling Extrusion 4/2018 The system is able to dose up to six components and, with the inclined free weighing mixer developed by Moretto, a correct mixing of all the ingredients is guaranteed, excluding any pos- sible overmixing phenomenon. A reliable, modular and easily accessible machine for the opera- tor, who can easily view the status of the machine and inter- vene with rapid changes in production and cleaning. The Technologies for Excellence in Extrusion – GRAMIXO wins Every Comparison!