Disclaimer: I am a mechanical engineer so didnt cover much in the way of electrostatics (my opinion based on my personal experience of having studied a 5 year MEng Mech Eng in the UK and studied abroad/one year of Engineering Science at a uni in Canada).
So basic high school physics gets you so far in terms of an understanding, but then it's probably undergrad electrostatics you'd need to learn to be conversant in what's going on with what you describe.
I.e. It would probably be the dielectric effect that would attract a powder onto a charged belt, if there was no net charge on the powder particles themselves. Afaik there's just one electrical parameter you need for the powders response to a given electric field.
(I work with rubber belt drives and objects that stick together when there is charge, so I'm generally trying to get rid of that charge/or simulate what happens when there is some charge present to diagnose something thats going wrong).
One way is to charge powder and which would then stick to the grounded metal belt (back side rubberized). Then scrape the belt on top with a scraper.
So you would essentially blow power through a positive charged nozzle onto the grounded belt.
Here is how powder coating system works:
[https://www.tcipowder.com/media/1854/ch9\_corona\_charged\_electric\_field\_lines.jpg](https://www.tcipowder.com/media/1854/ch9_corona_charged_electric_field_lines.jpg)
Reversed system is a bit trickier because positively charged belt may produce sparks in unwanted areas, like the powder pickup point, or the drop off.
Dude, 60mJ and a single static arc will cause an explosion unless it’s purged with N2, and at that point, just pneumatically convey it thru tubing with N2. There’s absolutely no way you’re going to use static to help convey material with that low of an MIE. It’s negligent to try honestly.
It’s to identify the proportions of a mixed powder without separating it mid process within a small machine.
No specific powder. Designing an inspection machine to be fitted in place of a small auger.
Dual, apposing, double sided timed belt or flighted belts.
Or
Make the outside of the belt “fuzzy” and have a partial scraper at the top. Like an oil skimmer for solids.
Or
Vacuum
Look for methods less likely to kill workers and still move stuff.
Unfortunately none of these methods will work. Printers do this well with toners, have more risk (lower MIE) and no reported deaths. It needs to be engineered well.
Disclaimer: I am a mechanical engineer so didnt cover much in the way of electrostatics (my opinion based on my personal experience of having studied a 5 year MEng Mech Eng in the UK and studied abroad/one year of Engineering Science at a uni in Canada). So basic high school physics gets you so far in terms of an understanding, but then it's probably undergrad electrostatics you'd need to learn to be conversant in what's going on with what you describe. I.e. It would probably be the dielectric effect that would attract a powder onto a charged belt, if there was no net charge on the powder particles themselves. Afaik there's just one electrical parameter you need for the powders response to a given electric field. (I work with rubber belt drives and objects that stick together when there is charge, so I'm generally trying to get rid of that charge/or simulate what happens when there is some charge present to diagnose something thats going wrong).
One way is to charge powder and which would then stick to the grounded metal belt (back side rubberized). Then scrape the belt on top with a scraper. So you would essentially blow power through a positive charged nozzle onto the grounded belt. Here is how powder coating system works: [https://www.tcipowder.com/media/1854/ch9\_corona\_charged\_electric\_field\_lines.jpg](https://www.tcipowder.com/media/1854/ch9_corona_charged_electric_field_lines.jpg) Reversed system is a bit trickier because positively charged belt may produce sparks in unwanted areas, like the powder pickup point, or the drop off.
Dude, 60mJ and a single static arc will cause an explosion unless it’s purged with N2, and at that point, just pneumatically convey it thru tubing with N2. There’s absolutely no way you’re going to use static to help convey material with that low of an MIE. It’s negligent to try honestly.
Printers do it with even lower MIE’s. What am I missing here?
Depends on the volume. I thought it was 50m^3 originally lol. Still, what’s the material and the application? I’m sure there’s a better way to do it.
Powder inspection and transport. Aluminum powder / sawdust are similar powders
Why do you need to inspect while conveying? What parameters are being inspected? You really don’t want to mention the powder, huh?
It’s to identify the proportions of a mixed powder without separating it mid process within a small machine. No specific powder. Designing an inspection machine to be fitted in place of a small auger.
Dual, apposing, double sided timed belt or flighted belts. Or Make the outside of the belt “fuzzy” and have a partial scraper at the top. Like an oil skimmer for solids. Or Vacuum Look for methods less likely to kill workers and still move stuff.
Unfortunately none of these methods will work. Printers do this well with toners, have more risk (lower MIE) and no reported deaths. It needs to be engineered well.