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now letamp;#39;s look at the inside of an extruder to see how it works the plastic raw material in this hopper travels by gravity to the feed throat and drops on to the rotating screw the rotation of the screw conveys the plastic forward through the heated barrel as the plastic has conveyed forward along the screw the channel depth decreases forcing the plastic through a smaller area the combination of compression and screw rotation causes friction which generates heat this is called shear heating this heat along with the heat from the barrel heating system melts the plastic by the time the plastic is conveyed to the end of the screw it should be well mixed and at a proper temperature and pressure needed by the die the plastic is called a melt at this stage beyond the screw there can be a screen pack the screen pack is a set of wire mesh filters that the plastic must flow through the screens are typically from 20 to 100 mesh which indicates the wires per inch the screen pack is suppor
