Bulk Solids Encyclopedia

Interesting facts about bulk solids!


What do you know about the flow-related characteristics of your bulk solid?

The first step towards a safe discharge is to perform a precise analysis of the bulk solid in our laboratory. Preceding from the resulting parameters the mass flow geometry is determined and the size of the discharge opening is calculated. Depending on the bulk solid the opening is equipped with a suitable discharge device. The device has to enable the movement of the material in order to loosen the complete surface of the stored material at the discharge opening.


GEROLDINGER's Oszillomat discharging system meets these requirements precisely. The discharge opening of the Oszillomat can be individually designed for each bulk solid. As a result a safe and reliable discharge is guaranteed. 

Discharge of your bulk solids

Eventually unproblematic bulk solids turn out to be hard to handle - this may appear in connection with another process step or an automation level.


Unsuitable discharge systems or false silo geometry often cause problems.

A likely result of this issue is that subsequent processes relying on steady material flow are no longeer ensured and can even lead to the shutdown of a plant.


Our methods and know-how avoid these problems and guarantee a safe discharge for the majority of bulk solids. For further details visit "Products".

Mass flow - the key to preventing problems in silos

When storing bulk solids in silos "mass flow" is a commonly used term. In fact mass flow is part of the solution to all those problems concerning storing, extracting and dosing that occur in silos.

The opposite of mass flow is "funnel flow", which is a usual phenomenon when handling bulk solids and can cause serious problems inside a silo.


The general meaning of mass flow is called "funnel flow" which is a usual phenomenon when handling bulk solids and can cause serious problems inside a silo.


The general meaning of the term is that bulk solids only flow in the center of the silo while at the same time they are stuck at the silo's walls.


At mass flow the entire content of the silo is in motion. There are non or only few areas where material flow is not given. 

Therefore, the right geometry of the silo is a prerequisite for mass flow. To actually guarantee mass flow the bulk solids must also be extracted simultaneously and evenly across the cross section of the silo. 

The guarantee of a reliable discharge

The last step of a logistical process is the discharge of the stored material. Therefore, GEROLDINGER utilizes a clearly structured method in order to guarantee a reliable discharge. 


Starting with the analysis of the bulk solid in our bulk solids laboratory information about the bulk weight, particle size distribution and water content is determined. The resulting parameters are entered in an extensive bulk solids database.


Subsequently the laboratory results of simple manual tests, elaborated shear tests and previous experience are compared with plants already constructed for similar bulk solids. Currently there are about 1.000 different analyses of bulk solids available.


Only the combination of current laboratory data, the experiment results of the technical center and GEROLDINGER's long-standing experience results in an economical plant concept.

If you have problems with your bulk solids or are planning a project: send us a sample of your material – and we will perform an analysis.


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