62 helps to align fibers with slit 52 easing the passage of longer fibers through slit 52 others have hypothesized that proper formation of vortices ameliorates the formation of deposits between the slits of the screen six different screen baskets having the general configuration illustrated in fig1 were evaluated with recycled fiber samples collected from industrial commercial and post consumer waste pulp recycling operations the slot width and profile height for each of the screen baskets as reported by the manufacturers are set forth in table 1 upon microscopic inspection it was determined that the geometry of the screen baskets varied considerably from that stated by the manufacturer in several cases table 1 compares the actual screen basket geometry to that reported by the manufacturers over a period of several months the screen baskets were evaluated with pulp samples having average stickies contents and size variations as set forth in table 2 from these results cleanliness efficiencies were obtained on both a number basis and an area basis as set forth in the three parts of table 5 these results are also presented graphically in fig5 10 while fig1 presents a correlation between slot width profile height and average cleanliness efficiency as the demand on the fiber processing lines typically varies from time to time depending upon the paper machine needs it is quite advantageous for a screen design to be able to provide a relatively consistent output over a range of throughputs to demonstrate the ability of screen designs.