Powder compactor
Powder compactors or powder deaerators are continuously working rolling mills for deaerating and compacting dry, fine-grained powders.
construction
The rolling mill essentially consists of two rollers rotating against one another, namely the filter roller and the press roller, which are driven by a gear motor via a spur gear . The filter roller is provided with a porous sintered metal coating. A vacuum is applied in the filter drum via a hollow shaft . An adjustment unit is used to set the gap between the rollers. On the adjustment unit there are spring assemblies for generating the pressing force.
functionality
Due to the vacuum applied to the filter roll shell, the product is sucked in and held and drawn into the gap between the filter and press roll. The interaction of vacuum and pressing force causes venting and compression of the product. At the end of the compaction process, the compacted product is peeled off by a knife on the rollers and then leaves the rolling mill.
Applications
Rolling mills can be used for venting and compacting powders and many other fine-grained bulk materials. The objective is usually to increase the bulk density and / or to improve the handling properties of the product. However, they are also used for dosing and pre-compression in granulation processes. Typical products in which the rolling mills are used are silica , carbon black, pigments, aluminum oxide and magnesium oxide . The product temperatures can be up to 100 ° C.
Process engineering peculiarities
The purpose of the rolling mills is to save on packaging, transport and storage space by in some cases considerable volume reduction. Explosive products can also be compressed.
Web links
References
- ^ HG Hirschberg: Handbook Process Engineering and Plant Construction: Chemistry, Technology and Economic Efficiency , Verlag von Springer, Berlin, 1999, p. 1065.