Example of resistance to impact test
However, other procedures are also available. For example, a resistance to impact test which provides information on the behaviour of the material after a short-term, high load. How a stone reacts to slow but constant pressure is demonstrated by the pressure resistance test, which is carried out in co-operation with the University of Stuttgart.
From the laboratory test to the suitable Kleemann crusher
All these tests allow inferences to be made about the machine that is later best suited for the processing of the stone. If the material is difficult to crush and abrasive, this supports the use of a combination of jaw and cone crusher. A wear forecast can also be made. This is an important parameter for customers because every change of the crushing tools costs time and money. Apart from the testing of material properties, the laboratory also offers the option of preparing a so-called grain size curve.
The grain size curve – which grain sizes can be expected?
The term "grain size curve" already describes the objective of the test: different screens are stacked, from coarse to fine, in a laboratory screening plant and the sample material is filled. After an exactly defined screening duration, the tester removes the screen decks one after the other and weighs the oversize product of each individual deck. In this manner, the composition of the individual grain sizes of a stone sample can be determined exactly. This analysis is also important for many customers – for example, if sand production is planned and an analysis of how much sand already exists in the feed material has to be carried out. The test is also often used at Kleemann for internal further development, for example, when testing the behaviour of prototype plants.