Pneumatic conveying of raw materials over long distances
Mixer loading
Finished product conveying
Simplest cleaning during product changeover
The Solution
Bulk goods handling for compounding different materials (fibre-reinforced) with maximum flexibility and manual premix production
Flexibility is a feature required in almost all systems, especially in those which are used for the production of many different engineering grade plastics. Various manufacturing processes on the one hand and the service concept of the manufacturer for compounding and formulation of recipes on the other, were the basic requirements and the basis for the system concept.
The bulk containers are delivered by truck in sea containers, possibly also in ordinary silo vehicles or in big bags. They are conveyed into the external silos by pressure conveying. Depending on the raw material, the silos are equipped with a head space drying system and partly as a two-chamber silo.
The distribution of the raw materials to the various compounding lines is carried out via a coupling station. Pneumatic suction conveyor systems bring the raw materials to the receivers located above the extruders.
These receivers can alternatively also be filled in free fall via drop tubes from the level above. Medium and small components, which are available in sacks, containers or mixing vessels, are emptied into the receivers via appropriate discharge bases. The premix for the mixing vessels is weighed and filled with additives on its own manual ManDos weighing station.
Special raw materials are provided in large buffer bins and two differential dosing scales are made available via a separate discharge base.
All receivers located above the extruder serve as a feed tank for the differential dosing scales, which feed the large and medium components, the glass fibre and the premixes with the small quantities to the extruder.
After compounding and subsequent granulation, the granules are separated from oversize and undersize grain in a vibration screener and then transported in day silos using a suction conveyor. A metal separator is located in the conveying line to sort any metal residues that may be present. The granules are conveyed in glass tubes, which are provided with grounding cables due to the abrasive components of the granules.
Small batches can be filled directly into sack goods from the day silos. Large batches are transported from the day silos to the interim storage in ten inner silos by means of a pneumatic suction conveyor. From the inner silos, the large batches can be filled into sacks via a mobile filling line.
