Powder is a contaminated item and needs to be moved around the process using the correctly designed system. This article explains the key points to consider before specifying or using a Vacuum Conveyor for moving powder.
Negative Pressure Keeps Powder Contained
Vacuum Conveyors draw powder through pipework by creating suction to move powder within a process. Any leak will pull air into the leak rather than pushing powder out, meaning that loose material is contained within the system, preventing escape into the surrounding workspace and potential exposure. Controlling dust exposure in the workplace is a key requirement within the legislation COSHH.
Separate Air From Powder at the Receiver
When powder is being transferred from one process to another it can cause a number of problems – contamination, unsafe working practices, loss of product. Here’s how you can avoid them.
Seal Against Moisture Ingress
Once drawn into the vacuum conveyor system, moist air can cause clumping of hygroscopic powders or degradation. Desiccant filters or even moisture traps can be fitted to the air inlet, and the resulting seal checked periodically.
Match Transfer Speed to Your Material
It can also break up very fragile granules and separate light particles from heavy ones by running at too high a speed. This is kept to the lowest speed to move material.
Ground and Bond the Pipework
As with any other conveyor, static can form when moving powder through pipes. The pipes are bonded together (earthed) and any other objects in contact with the pipes are also bonded and earthed to stop any sparks. More on Vacuum Conveyor can be found at aptech.uk.com/pneumatic-conveying-systems/vacuum-conveying.
By following these 5 key points, your powder transfer can be so much cleaner, safer and of less waste.
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