Extrusion International 3-2020

44 Extrusion International 3/2020 MATERIAL HANDLING Aleko volumetric (on top) and gravimetric dosing system The advantages of using automatic dosing systems are obvious, because this solution allows to reduce the in- fluence of the human factor on the production process, save raw mate- rials due to a more accurate evalu- ation of its consumption, as well as obtain programme reports. All this helps to improve the quality of the final product, plan the material sup- ply and optimize financial costs, es- pecially when it comes to processing of complex multi-component formu- lations. Aleko, the largest Russian manufacturer of equipment for the processing of polymers, offers sev- eral options of automatic dosing sys- tems that are designed to perform various tasks and different accuracy of adherence to the formulations. Conveniently, each of the described devices has a remote connection fa- cility and remote adjustment. Gravimetric dosing When it comes to a high accuracy of dosing, and working process is carried out with small portions of ingredients, the gravimetric dosing system from Aleko with the func- tion of control of the whole extru- sion process is the optimal solution. It has a high dosing accuracy (up to 0.04%). This device is a must- have when manufacturing products where formulations comprise ex- pensive materials, as well as highly concentrated masterbatches and functional additives. ents that make up the formulation, they are blended in the mixing hop- per. Upon reaching the user-specified maximum weight, the material is sup- plied into the feeding zone of the screw. After the announcement, these sys- tems immediately attracted the at- tention of specialists, which confirms the growing market demand for in- expensive, but at the same time high- quality solutions for the automation of production processes. Volumetric dosing Aleko volumetric dosing system was designed and introduced to the mar- ket 5 years ago. This system is an ex- cellent solution for companies apply- ing CaCO 3 fillers in order to reduce the cost of the final product. It is con- venient to use volumetric dosing sys- tems in order to mix up to four com- ponents of various density (density of polyethylene 0.91 to 0.95 g/cm 3 , and CaCO 3 fillers – 1.8 g/cm 3 ), while the dosing accuracy less than 1% is not required. The operational principle of volu- metric screw dosing systems “Aleko” is supplying of a given amount of ma- terial for a certain time in accordance with the formula. Dosing is carried out by a screw ele- ment by moving the material into the inter-turn space. Auto-propor- tional supply of mixed raw materials ensures continuous feeding of ex- truder and obtaining required char- acteristics of finished products. The simple installation and operation of the Aleko volumetric dosing systems is combined with easy modifications in configuration: the structure of 1 + 1 dosing system (one main plus one additional component) can be easily transformed up to 1 + 4 (one main plus four additional components). ALEKO Machinery is a manufacturer of volumetric and gravimetric dosing systems with extrusion control function and high accuracy of dosing of the material (0.04%). Both models of dosing systems are highly demanded among factories in Russia, countries of Central Asia and Eastern Europe Simple and Efficient Dosing The operational principle of Aleko dosing systems is based on the sup- ply of material in portions of a certain weight in accordance with the formu- lation: the component is fed to the hopper, where it is weighed (portion dosing accuracy of 0.04%), after that, the following components are fed in turn. After weighing all the ingredi-