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Gravimetric dosing


As an alternative to the dosing roller, components are dosed into the scale container using sliders. The scale records the actual weight of each component, and its controller compares it with the calculated target value. Weighing is repeated several times for each subsequent container fill, averaging the results.

As soon as the target weight is reached, the material is emptied into the mixer.

By combining the opening time of the sliders with volumetric dosing, a dosing accuracy of 4 grains per 1000 can typically be achieved.

 

  • KOCH-TECHNIK gravimetry
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      GRAVIKO GK 250

       

      GRAVIKO
      Patented gravimetric dosing and mixing system from KOCH-TECHNIK.

      Prof. Dr. h.c. Werner Koch with the GRAVIKO has developed a system that allows the user to simplify the gravimetric dosing of material.

      With the GRAVIKO series, you can easily dose and weigh, check, correct and evaluate – in a single work step.

      The control system detects external interferences and compensates for them during weighing. Incorrect dosing is therefore a thing of the past.

       

      Production line with GRAVIKO GK 250 at a plastics processor in Mexico.

       

      A GRAVIKO GK can be dismantled without tools within two minutes.

      For easy material changeover, the sliding device is replaced by a swivel device for large dosing stations.

       

      Gravimetric dosing process with the patented GRAVIKO:

      • The individual material components, such as virgin material, masterbatch and additives, are dosed into the weighing hopper
      • The ACTUAL weight is registered …
      • … and compared with the TARGET.
      • As soon as the target weight is reached, the material is emptied into the mixer and mixed homogeneously for processing.

       

      GRAVIKO GK 65 with control unit, conveying technologie and intermediate hopper

       

      The GRAVIKO series:

      GRAVIKO Typ GK 65 – for throughputs up to 70 kg/h
      GRAVIKO type GK 250 – do przepustowości do 300 kg/h
      GRAVIKO type GK 600 – for throughputs up to 600 kg/h
      GRAVIKO type GK 1000 – for throughputs up to 1000 kg/h
      GRAVIKO type GK 1500 – for throughputs up to 2000 kg/h

      (special types on request)

       

      GRAVIKO type GK600 in a modular system.
      The KOCH modular system: everything fits together, each device can be supplemented with a different module. The simple handling is also fascinating: the conveyor hoods are hinged, material conveyors can be swivelled and sliding and swivelling devices facilitate material changes – without much effort and all without tools.

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  • ELBI gravimetry
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      The innovative GRAW gravimetric dosing and weighing system doses plastic granules and bulk additives. It is used in injection molding and extrusion processes.

       

       

      By separating the scale from external factors, the GRAW gravimetric system enables highly accurate granulate dosing. The GRAW-100, GRAW-200, GRAW-300, and GRAW-400 series are available. The GRAW-800, a system with the highest capacity, is currently being developed. The GRAW series ensures efficient granulate mixture preparation for processing equipment with capacities ranging from 100 kg/h to 800 kg/h. The device features a touchscreen control panel with a 5.7-inch color screen.

      GRAW series dosing units allow for dosing 3 to 6 components. They can be installed directly on injection molding machines or extruders. They are characterized by the highest dosing accuracy, simple operation, the ability to quickly adapt to new product needs, and easy cleaning of the dispenser’s removable components.

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