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If you are using powder hoppers, you should know “The fluidity of powder”

It is called “have poor fluidity of powder” when the hopper used for charging the powder is clogged or cannot be discharged to the next process.
But do you know exactly what factors determine the “The fluidity of powder”?

This article provides a brief overview of the factors that influence The fluidity of powder.

What is "Fluidity of powder"?

Roughly speaking, liquidity is “ease of powder flow”.
In our company we say simply, “slippiness”.

For example, the sand inside an hourglass flows smoothly and continuously.
These powders are evaluated as “have good liquidity” and those that do not flow smoothly are evaluated as “The fluidity of powder is bad.”.

Powder with a poor fluidity of powder can clog the hopper and prevent the contents from being loaded or discharged.

What are the factors that influence liquidity?

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What is the Solution to Clogging?

“Clogging” which tends to cause problems when the powder is discharged from the container.
Discharge may take a long time or stop, resulting in uneven product quality.
In the first place, why does the phenomenon of powder clogging occur??

The main cause is the powder pressure and friction!

Ideal discharge state: mass flow

Due to the pressure of the powder in the container and the friction generated on the surface, the powder becomes difficult to slip and discharge.

 
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What happens when the packing swells?

What is swelling in the first place?

Depending on the compatibility of the packing and the liquid, the packing may absorb the liquid and expand, resulting in flabby. This is called “swelling”.
This phenomenon is caused by the liquid getting into the intermolecular space of the rubber of the packing.
As an image, it is similar to the condition when wakame is rehydrated.

What are the risks of swelling?

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