Polymer Industries utilizes a single screw continuous sheet extrusion process in which plastic pellets are fed into the barrel of the extruder and conveyed by the screw that is inside of this barrel out of the other end of an extruder. The heaters which are outside of the barrel of the extruder as well as the friction from the rotation of the screw melt the plastic pellets into a sheet form and the plastic is then placed on a 3 roll stack. The plastic goes through the bottom and middle roll, wraps around back of the middle roll and then back around the top roll as shown. These rolls are water cooled and help to take the heat out of the plastic. After the plastic comes off the top roll, it travels down the conveyor to the end of the sheetline where a saw cuts the sheet to width as well as to length. As the plastic travels the length of the conveyor, numerous operations help to stress relieve the sheet as well as put the desired surface finish on the sheet surface.