Dosing and Mixing Station Continuously Regulated Gravimetric System

Editor: Dr. Jörg Kempf

Gravimetric mixing and dosing disciplines are ideally covered with Motan Colortronic’s Graviplus synchronous dosing and mixing station. Up to eight dosing modules can be used for granulate, micro-granulate, powder, liquids and regrind.

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Graviplus works according to the loss-in-weight principle. The material flow is continuously regulated and monitored according to weight in real time.
Graviplus works according to the loss-in-weight principle. The material flow is continuously regulated and monitored according to weight in real time.
(Picture: Motan Colortronic)

With throughput performance from 0.25 up to 7,500 kg/h and constant dosing precision of ±0.1 % (1:1,000,000 load cell resolution), a level of performance and product certainty is achieved that is essential for continuous production processes. Graviplus works according to the loss-in-weight principle. The material flow is continuously regulated and monitored according to weight in real time.

Bulk density fluctuations and changes in particle size or flow behaviour cannot influence dosing precision. Vibrating wire technology makes the load cells insensitive to both vibration and temperature. Self-calibration means the need to dose out for new materials is eliminated.

The components are continuously dosed time-synchronised into the mixing chamber by speed-controlled precision dosing screws. The result of this is that a homogenised mixture reaches the intake zone of the processing machinery. Separation is impossible, even with critical materials. Dosing modules with twin screws and stirrers are used with poorly free-flowing or non-free-flowing materials, weigh-tanks with liquids.

Easy Installation and Operation

Graviplus is easy and fast to install. The equipment can be emptied and cleaned in several minutes when changing colour or material. Equipment size and height have been significantly reduced, without detriment to line performance, through the use of newly developed fast refilling systems (max. 40 refill cycles per hour). Consequently, the conveying system that brings the components to the dosing system can also be made with smaller dimensions.

The advantage here: easy installation of the station directly at the processing machinery. It also eliminates the need for an equipment platform (cost reduction). Correspondingly, service tasks such as cleaning, material change and reconstruction are facilitated. Demands for shorter downtimes and simultaneous higher flexibility in operation are therefore completely fulfilled.

Powtech 2014: Hall 4, Stand 347

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