Obviously choosing the right tip size for your machine and product is really important as this can reduce the overspray, give you greater control and overall a better finish. If you use an orifice size too big you will get too much paint on the surface & if the hole is too small you will get blockages and no end of problems.
All airless spray machines have a filter on the intake tube which is also known as the rock stopper, some machines have a filter on the machine body called the manifold filter and the guns have a pencil filter in the handle.
To get the best quality of finish and continuity when spraying you really need to consider the type of filters you use.
The point of the filters is to catch any bits before they get to the tip and cause blockages. In most airless machines there are 3 points of filtration as discussed above so there are 3 chances to minimise any problems & each filter get smaller/finer as the product circulates through the machine.
The size of the filter is dependant on the number of mesh – the more mesh the finer the filter and the higher the filter size the finer the filter.
We generally use 60 mesh in the manifold filter and 100 mesh in the gun inline filter for most of our spraying projects.
The choice of filter generally depends only on the product you are spraying with. Thinner products will need a finer filter when compared with thicker products.
Manifold Filters generally come in 4 different sizes:
20/30 Mesh – most other products and a larger orifice 0.023″ and above up to some fillers although when using airless plaster you have no filter at all
50/60 Mesh – still a fairly small orifice spray tips and emulsions/water based trim paints 0.015″-0.021″
100 Mesh – small orifice spray tips and thin products 0.012″-0.014″
200 Mesh – small orifice spray tips and thin products 0.008″-0.010″
There are lots of Gun Pencil/Inline Filters available however in the Decorating Marker we generally only use 2 of them:
60/65 Mesh – still a fairly small orifice spray tips and emulsions/water based trim paints 0.015″-0.021″
100 Mesh – small orifice spray tips and thin products 0.008″-0.014″
These are not generally changed very often but it is good to be aware of them.
Tritech send out all their models with a 15 mesh Suction Filter as standard.
There are also 10,30 & 60 mesh filter available