Analysis of the Causes and Solutions to the Caking of Powders

Many products from the pharmaceutical, food or chemical industry are sold in the form of powders.

These powders are susceptible to caking, which affects their usage and quality. In most of the cases, caking of powders is caused by absorption of moisture from the environment.

By using powder rheometers, we can study the caking rate in powders and find out the factors that contribute to caking at various stages.

Causes of Powder Caking

Environmental factors that cause caking of powders are temperature and humidity; changes in the former cause condensation of powder particles while changes in the latter causes dissolution of the powder.

此外，在测试过程中的粉末固结会导致粉末的机械结束。粉末需要进行彻底的测试，以研究结块的发作和进展。现代粉末测试方法，如流变仪，易于操作，并提供与粉末特性有关的快速和有用的信息。

获得的数据谈到整合对结块速度的影响，这对于决定最适当的制造和储存条件可有用。

Testing Methods

Rheometers are very useful in determining the dynamic properties of a sample and also enable direct measurement of the powder’s flowability.

最重要的基线特性是基本流量（BFE）;这是旋转叶片以特定的旋转和垂直速度浸入粉末中的叶片所需的能量。

Figure 1 represents the axial and rotational forces acting on a blade.

Figure 1.用粉末流变仪测量BFE

The value of BFE can be measured by automated test methods and is the most important parameter that gives a good idea of the cohesive properties of the powder sample.

粘结粉末影响BFE grea描绘洪涝频发的价值tly for the reasons described below. The inter-particle bonding increases with caking; therefore more energy is needed to rotate the blade. if the caked sample is stiff, it will offer more resistance to movement.

Caking due to moisture absorption and increases the bulk density of the sample, which results in higher values of BFE.

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整合对结块的影响

为了研究固结对结块的影响，对9kPa的压实应力进行了一些样品，而在不固结的情况下留下相同数量的样品。显示了所有样品的测试结果，显示了相应的BFE值......

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