The flexible cantilevered lip, which defines the thickness of slot opening, is adjusted downward (reducing slot thickness) by means of a series of adjustable push screws. These screws are spaced approximately one inch apart across the entire width of the die. Thus, the die opening can be adjusted from a full or maximum opening to a lesser opening by adjusting the push screws.
It is important to note that, after adjusting the slit opening to produce a uniform thickness of film, the opening itself will not be dimensionally uniform across the width of the die. This variation in opening will compensate for any mismatch between the material rheology and the die's static internal distributor by acting as a variable flow valve.
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