You've got no knowledge or experience?

Are you buying powder coating installation for services? Or maybe for your own production?

What to look for when buying equipment for powder coating?

 

We'll try to make that clear for you what you need to pay attetntion to when it comes to buying powder coating equipment.

 

First of all you need to understand that it's possible to buy equipment that will work for years and that don't need service. All you have to do is make a right decision.

 

What's the most important part of powder coating equipment? Since you have no experience yet i bet you would think it's applier. However you couldn't be more far from truth. Even the best applier won't help if temperature distribution in your oven is bad. If there's too much heat in one place of an element the paint will discolor and if there's not enough the paint will come off.


The most important part of equipment is the oven.

 

Ask yourself what type of elements do you want to paint, who's your client, do you assume any growth? Or maybe you don't want to pay large sum of money for powder coating equipment? Why would you over-pay, noone likes to over-pay. However consider these factors. You think - it's obvious, i say - from my experience and knowledge of the market products differ from each other yet nobody checks that. For most pepole an oven is an oven. I met clients that bought products of such bad quality and for a way too high price. Simply becouse he didn't think that it's possible to buy this sort of equipment in Poland with way better quality and for lower price.


How can i check if i'm not over-paying for this product and if the company is professional?
The choice is simple and you'll make the right one with these pointers. Check an offer with the best parameters of equipment. There are many companies with expensive products yet the quality does not come in pair. Ask every company to tell you the price of equipment with better parameters than you've chosen. You should get some idea about how much the product should cost.


Ask directly, how much would a powder coating booth cost in a cheaper rival company if you'd want two additional aluminium fans installed? I'm afraid it won't be cheaper anymore, some things can't be done cheaper and if they are then with a worse quality components

  


1. Powder coating oven.
a) Temperature distribution in the oven.

There are many ovens with variety of methods used in them, yet there are not that many that are good for curing. Not many manufacturers talk about temperature distribution in the oven even though it's fundamental. How you'd be possible to make a correct choice not knowing the basic parameters. Many manufacturers don't even measure it! So how could they possibly tell you about it.

b) How's the air circulation in the oven working?

An air circulation oven needs to have tunnels that distribute air evenly along the whole surface of the chamber. If an oven has a fan that simply "stirs the air" there is no possible way to distribute the air evenly. Simply having these tunnels does not guarantee a good outcome, that's why ROMER ovens have regulation of air ventilation in every part of the oven and every oven is regulated and measured after the production process.

c) What are availible air ventilation options in the oven?

Air in the oven can be distributed in many ways, it can flow along whole wall onto the next one or it can be drawn from the ceiling and ventilated with both walls, not every option is optimal for the heating process


d) What about heat coil or fan exchange?

Professional ovens have module structure, which means that if a heat coil over-heats you won't have to disassemble whole oven to get to it. You just unplug the module and switch it to the working one. Same goes with a fan. You just unplug the module without interferring with the oven structure.

2. Powder coating booth.

Why is it important what is the booth made of? Do I even need a booth? Neighbour has a paint shop and he paints in the air.

Main reason for a booth to be used is that it dedusts the room preventing from explosive mix that can appear. In addition that it allows you to recover some of the powder that you've used.

 

 a) What kind of fans are in the chamber?

Most of the companies install steel fans in their chambers, which is illegal and dangerous. In addition that that steel fans are heavy which means that they need more power to work and consume more electricity. Steel fans are also very noisy, by manufacturers trying to obtain lots of power they they enhance rotation of a fan up to 2800rpm which makes it as noisy as starting airplane. Aluminium fans are light, they work at the noise level of 73dB and they don't cause sparks to appear.
In the powder coating booth there is 2nd state of explosion hazard zone - which means there are lots of laws to prevent any possible explosion - improvisation is not adviced.

Steel fan is way cheaper than the aluminium one, you shouldn't however be cheap when it comes to safety, if there are sanitary inspections you may have problems if you have steel fans installed. Steel fans may cause sparks to appear when they rub against other metal which may lead to an explosion.

b) What's the extractive power of the booth?

The more the extractive power the more noisy the fan, ask about maximum noise leve in the booth - that may be of importance when it comes to inspections.

The less the extractive power the weaker the power of the booth, booth has to have a lot of power, it may be working fine while filters are new, however after a few days of using it won't draw the powder as good since filters do clog up and it's nearly impossible to clean them completely.

c) What is the booth made of?

Booth can be made of variety of materials, the worst possible material you can make a booth of is wet painted steel.


Booth has to not attract electricaly charged powder, there is no need to explain the difference of powder coated surface or wet painted one. There are some manufacturers that sell wet painted booths. In case of using black wet painted metal electric charge is easily attracted to it. The surface of such booths is also rugged which makes the cleaning process harder.


If there's stainless glass steel that contains high amount of chrome electric charge attraction parameters are the same as the raw not painted metal. That's becouse this used by some manufacturers type of metal is only called stainless since it will rust as soon as chrome surface starts to come off.


Booth made of powder coated steel is the best and the most chosen product in the world. That's becouse synthetic powder coated surface acts as an isolation layer that reduce conductivity and magnetism so the powder doesn't stick as in the previous examples. 

There is also stainless acid-proof steel (AISI304, PN 1.4301) - product that is imitaed by glass steel, booth made of this material does not show any signs of charge attraction, however this choice isn't always efficient, it's good only for big paint factories that has enormous powder usage. Alternatively there are also booths made of plastic with even better parameters.

 

d) What filters are installed?

There are 3 kinds of filters the cheapest cellulose ones, cellulose-polyester and full polyester.
Best ones are polyester filters, they can be cleaned using water, they are resiliant to any mechanical damage. Filters made of cellulose are usually painted yellow/brown/orange, they're simplest paper filters that aren't that much resiliant to mechanical damage and can't be cleaned using water.


ATTENTION!
Even big companies use cellulose filters. However changing them won't solve your problem. That signals that your booth extractive power is low! If you change filters for a tougher material your booth will stop working. Manufacturers use those filters becouse they prove to be less resistant to a ventilator.

e) What's the filtration surface of the booth?

By being cheap some manufacturers make filtration surface smaller. Filter is filter, right? What difference does the surface make. A lot of clients say "Booth has 3 filters" but it means nothing if you have no idea what's the surface. One good filter may have as much surface as four quality lacking ones.

f) How the filter is installed?

If you're switching colors often, the best type would be screwed filter installation. It makes filter change faster, most of the manufacturers use cheaper - bayonet installation. Some of them don't even use aluminium alloy flange. Screwed installation makes booth-filter connection much more secure. If you're using bayonet installation and your booth has enough power, paint will flow out of these non secured points.

g) How are the filters cleaned?

Booth filters cleaning is fundamental, without it booth will stop working after the first day, filters clog up and booth stops working. It's important that the whole filter is blowed with compressed air. In booths produced by ROMER we use our own system that is more efficient than previously used Jet-Venturi system that most of the competitors use.

 

 

3. Powder applier


Powder applier role is to apply powder to an element, there are two kinds of appliers. Ones that load powder with friction in the barrel "Tribo" and ones that load powder using high voltage generators, electrostatic ones - "Corona".

Appliers' market is full with companies that specialize in producing this kind of equipment, they sell them for high prices that have nothing to do with actual production costs.

They're doing that becouse of the relatively highest profit, every paint shop needs an applier, it's the cheapest element of powder coating equipment, some people say that it's the most important part od a goof paint shop. That's not true, all that applier does is applying the powder on the element. Appliers may not be handling painting well, may fail to apply paint difficult-to-access areas, but that is common and not that important.

Way worse situation would be when an oven does not heat the elements well or elements are not ungreased properly. Those are the fundamentals, it's way more important than the applier.

If an element isn't ungreased well or wasn't heated right, the paint may seem fine for some time. The customer will receive his element, install it an after a few weeks it will come off, what then? This may cause huge loses yet this kind of problems do exist, and they are common if the oven is bad. So if you're plan is to save up on oven efficiency and surface preparation in favor of an applier you better rethink this.

 

 

Coverage Romer P.P.