Pourability
As flowability , the extent of the free mobility or program flow behavior of bulk materials referred to. It is influenced by its properties - in particular by grain size , grain distribution, surface properties of the grains, water content or moisture , admixtures of separating agents and foreign bodies. The pourability is an essential parameter for the control of production processes as well as the transport security and storage .
Measurement method
The flowability is determined, for example, with measuring funnels or special flowability testers, with the flow time being measured as a comparison value for a given mass or given volume and given in seconds.
The standard DIN EN ISO 6186 describes two methods for measuring the flowability of plastic granulates . Both test funnels with different outlet opening sizes are used, as well as a stopwatch and a scale . For the measurement, 150 g of the sample are poured into the funnel closed at the bottom . The shutter is then opened and the stopwatch started at the same time. As soon as the hopper is empty, the stopwatch is stopped and the flow time is read (procedure A).
For more precise measurements (method B) z. B. three measurements are carried out and the mean of the times measured.