Koch-Technik: Two new types of its Graviko dosing system

At the recent Fakuma fair in Friedrichshafen, Germany, Koch-Technik presented two new types of its patented gravimetric Graviko dosing system. The GK65 and GK 200 are deviced to precisely and reliably dose plastic materials with high reproducibility.

Accurate and reproducible doses exactly as called for in a recipe are key to the quality of any manufactured product. The exact proportions of main and auxiliary components determine the characteristic features of sensitive end products, making precise and reliable dosing indispensable. Koch-Technik has developed Graviko for the production of such components. It is a patented gravimetric dosing and weighing system and according to the manufacturer with excellent reproducibility.

The new Graviko generation doses individual components such as grains, powder, ground material or coarse powders into the weighing container using a slider or by volume. Tiny quantities can be dosed with an accuracy of 0.001s. Two load cells then register the actual weight of the components in the container and communicate the values to the Koch control unit, where they are compared with the calculated targeted value. Each filling is weighed hundreds of times in succession to balance out any variations. If the actual weight and targeted weight are the same, the bulk materials are emptied into the mixer underneath. A horizontal agitator optimally mixes the dosed and weighed batch before it is processed on the machine.

Control circuit for precision dosing on a new benchmark level
The accurate precision dosing coupled with the gravimetric weighing system are dedicated to produce a control circuit which ensures that dosing is carried out absolutely correctly regardless of the bulk materials used. The patented Graviko system offers an accuracy with a tolerance of +/-4 grains per 1000 grains. According to Koch-Technik, this value is unbeaten by conventional dosing systems on the market up to now.

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Full monitoring of the dosing process
The MCm-G Touch control unit precisely calculates the values. The MCm-G Touch is an easy-to-use control unit for gravimetric dosing systems. Once the recipe has been entered on the touch display, dosing takes place starting with the first cycle without the need for calibration. In terms of hardware, the device features an ARM 9 microprocessor, 4 GB of non-volatile memory and an SD slot. Ethernet and USB interfaces are available as options.
Other requirements are met by the software: users can select from 16 different languages, manual actuation for setting up or cleaning purposes, ground material program and large recipe memory, dosing parameters with nominal and actual value display, specification of dosing volume, implemented Internet FTP server, password and user-rights administration, alarm management and tolerance monitoring, control of four conveyance components and as an option the export of recorded data via USB and connection to visualisation software to depict the entire production process.

The gravimetric dosing system Graviko can be used for the highly accurate dosing of various material components and offers long-term stability. The new GK 65 and GK 200 Graviko devices are designed such that they either dose the batches directly on the machine or on a supplied frame. The GK 65 is designed for throughputs of up to 80 kg/h and the GK 200 for up to 250 kg/h. Depending on the throughput of the processing machine, up to four different components can be processed. Standardised in line with the Koch modular system, the new Gravikos are fully compatible with all Koch-Technik dosing and conveyance devices and accessories. All device components can be slid, swivelled or folded away on the processing machine without disassembly. Quick-fit closures and slide and swivel devices ensure rapid set-up and assembly of components without using tools.

More information: www.koch-technik.com/en

Werner Koch Maschinentechnik GmbH, Ispringen, Germany

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