Abstract: A card screen and a lickerin screen are provided for a forty inch carding machine having the usual side ribs and end blanks. The grid bars in both the card screen and the lickerin screen are of triangular configuration in cross-section and are structured to provide increased air flow for the removal of trash. One side of each grid bar extends downwardly in use at an angle of about 50.degree. to the radii of the main cylinder, or lickerin roll, another side extends radially from the main cylinder, and the third side extends between the first two sides in closely spaced substantially parallel relation to the main screen. There is no center rib and the grid bars extend the entire distance between the side ribs.