Flat Metal Screening
This is done much like the flat silk screen method but before the flat silk is used the bud will go through a metal grating process. The metal grate is usually made from tough nylon or stainless steel and is of equal proportions in pour size to the silk screen. By first using the metal grate we can remove more matter from the bud than the single silk screen would do. The bud matter that passes through the metal screen can then be sieved through the silk screen by shaking the screen back and forth over a glass surface. You can end up with 2 grades of sieved bud residue this way. The silk screening should produce mostly trichomes.