Powder coat spray booth

[stuvy]

Bungee cord

 

[Alf98]

Thinking more on it - it only needs to hold the filter panel in place when turned off, suction will pull it in when on so the clips can be very light indeed - a simple spring across each corner or something like that.

Also I don’t want you ruining your fan!! You may need a bag filter after this as powder coat particles are very fine and these are generally used as pre filters. And I’m sure you are not stupid so just a heads up, make sure you have your filter the right way and ensure it’s as air tight as possible.

 

[Davek0974]

Also I don’t want you ruining your fan!! You may need a bag filter after this as powder coat particles are very fine and these are generally used as pre filters. And I’m sure you are not stupid so just a heads up, make sure you have your filter the right way and ensure it’s as air tight as possible.

This fan is tough enough I had it hooked up to an extract system on my big lathe when i was doing a lot of cast iron, its sucked plenty of that - its made for sawdust/woodchip handling so its pretty tough.

The filter is a G4 which as far as i can see goes down to 1uM particle - Only info i can find on powder is a size of 1uM to 40uM so it should be ok. I'll be seating the filter on a thin bed of foam strip, the sides will be framed-in. The air-box will be seam-sealed once assembled, to strip it down i'll have to cut the seam-sealer.

My main concern is powder being exhausted from the outlet, will have to check that before deciding if i need to vent outside or not.

 

[Alf98]

This fan is tough enough I had it hooked up to an extract system on my big lathe when i was doing a lot of cast iron, its sucked plenty of that - its made for sawdust/woodchip handling so its pretty tough.

The filter is a G4 which as far as i can see goes down to 1uM particle - Only info i can find on powder is a size of 1uM to 40uM so it should be ok. I'll be seating the filter on a thin bed of foam strip, the sides will be framed-in. The air-box will be seam-sealed once assembled, to strip it down i'll have to cut the seam-sealer.

My main concern is powder being exhausted from the outlet, will have to check that before deciding if i need to vent outside or not.

Stick a bag over it

 

[Davek0974]

Stick a bag over it

Could do, maybe a proper filter box.

I might add a layer of filter wadding in front as a pre-filter, got a big roll of it so might as well use it.

 

[Alf98]

Could do, maybe a proper filter box.

I might add a layer of filter wadding in front as a pre-filter, got a big roll of it so might as well use it.

As long as your filter is sealed up enough mate you shouldn’t have an issue, which make is the filter? I find camfil original 30/30 are spot on and are a better grade than g4. If you really wanted to splash out you could try a HEPA filter but that is really un-necessary for what you need

 

[AdrianH]

OK I am a bit missing the point here with the filter at the top?

Is the filter to stop dust coming in or are you going to be drawing the powder up and out through the filter, because I think you will block it quite quickly.

If you have a powerful fan why not suck out of the booth at the bottom of the booth, make a sort of trough in the base with two sheets of 0.8mm so it helps collect powder that drops, draw out from the bottom side into a cyclone separator and then just have a filter box on the output of the cyclone. There is a good chance the cyclone would catch most of the powder before the air hits the filter.
You mention the fan was able to collect iron dust so guess it can move air in enough quantity?

Adrian

 

[Davek0974]

OK I am a bit missing the point here with the filter at the top?

Is the filter to stop dust coming in or are you going to be drawing the powder up and out through the filter, because I think you will block it quite quickly.

If you have a powerful fan why not suck out of the booth at the bottom of the booth, make a sort of trough in the base with two sheets of 0.8mm so it helps collect powder that drops, draw out from the bottom side into a cyclone separator and then just have a filter box on the output of the cyclone. There is a good chance the cyclone would catch most of the powder before the air hits the filter.
You mention the fan was able to collect iron dust so guess it can move air in enough quantity?

Adrian

This is all guesswork based on results from my current setup of four pallet tops and a cooker hood - most of the powder just settles on the floor and walls of the booth, the light stuff gets drawn up into the filter by the slow draught into the hood/filter.

The settled powder can be scooped up and re-used as long as the booth is kept clean, 99% of my stuff is satin black so no cross-contamination.

The fan i have is a 4" inlet - it would need a big cyclone I think.

All I'm aiming for is enough draught to gently pull the airborne dust into the booth and stop it floating in the shop. I have a feeling with the booth being grounded, a lot more will be drawn to the walls/floor than now as my little booth is chipboard

The cooker hood has one layer of filter cloth in it and will last maybe 10-15 jobs before it gets tossed, the big issue is that its a recirculating hood and any powder that gets by is just blown out the top, pretty much into my face

The only other booth i have ever seen up-close is a big water-wall one about 15' wide and 8' tall, all other ideas are just from pics on the 'net and it seems every booth is built different.

 

[Davek0974]

These were some of my idea pics....

 

[carbon]

Rather than use clips to secure the filter make the frame taller so the filter can be installed top first, then slid upwards over a lip on the bottom edge.


Gravity will then hold the filter in place when the fans not running. Hope this picture make sense, side view of filter in frame

 

[carbon]

I have a feeling the fan will be too strong but need to test it out, its a cap-start 750W motor and i don't think they can be speed controlled ?

If this fan is a centrifugal type and is to strong a moveable baffle fitted to the outlet will reduce the flow through the filter. It’s not as efficient as reducing the speed of the motor but does work

 

[Davek0974]

Started panelling today, loads of rivets and sikaflex

This the is the top panel with cutouts for two LED panels



The only thing worrying me at the moment is that i made it to come apart, my plan was to build it on the welding bench, then move it across to its support stand - thing is i'm not sure if two people can lift it

I can just about lift the top and bottom panels myself - top/bottom/2 sides/back and air box though?????

 

[Alf98]

Coming along nicely ! Have you insulated the panels with anything ?

 

[Davek0974]

Coming along nicely ! Have you insulated the panels with anything ?

No need, its a powder spray-booth not an oven

 

[Alf98]

No need, its a powder spray-booth not an oven

I know mate just asking as that can weigh then down a lot

 

[Davek0974]

I know mate just asking as that can weigh then down a lot

No worries.

I should have used aluminium to skin it but steel was cheaper

 

[slim_boy_fat]

but steel was cheaper

Local skip(s) > find washing machines > battery angle grinder = steel panels

 

[Davek0974]

Local skip(s) > find washing machines > battery angle grinder = steel panels

Hardly worth the effort at the price of thin steel sheet plus the bits would not be big enough

 

[Davek0974]

Stacks nicely



Reasonably large, looks like it will work ok...



Annoyingly one of the LED panels was DOA so have requested a replacement, now i need to try and lift the filter box in and fix it.....

 

[Davek0974]

Fully assembled, only one light as the other was DOA



Blower...



Hooked it up for a quick test, shot some powder in the air just inside the front, most of it dropped to the floor and the rest slowly drifted rearwards - looks like it might all work