A very important part of this is controlling mesh tension, keeping it consistent. Self tensioning frames allow you to control this very important aspect whether you're printing 4 color process or standard printing. They are an excellent investment to ensuring quality. The recommended mesh for process printing is 355 dyed monofilament polyester. As low as 305 or as high as 380 is acceptable.
Pre testing is imperative.
Tension should be between 25-35 newtons. Capillary film of 18 microns is recommended. It is important to expose your film as quickly as possible so as to maintain the integrity of your lower precentage dots without hardening in. A single point light source of 3K to 5K or above is recommended to ensure your finest halftones are represented. Always use an exposure calculator.