a sheet extrusion apparatus for producing an extruded sheet with varying thickness including one or more sheet rollers and a strip material affixed to one or more of the rollers . the strip material rotates coextensively with the cylinder it is attached to , such that it engages the plastic passing between the rollers and forms a notch in the plastic sheet at that location . in a preferred embodiment , the strip material is a length of conventional tape , such as teflon tape , that is capable of adhering to both the cylinder and itself , having sufficient durability to last a required amount of cycles . the present invention is easily retrofitted to an existing sheet extrusion apparatus , as the tape can simply be taken off of a shelf and added to the rollers . the present invention is preferably installed after an analysis to determine which sections of the plastic sheet may structurally withstand a reduced thickness .