The forward movement of polymer melt in an extruder barrel is resisted by drag flow, which is caused by the resistance to flow through the die orifice. Thus, this statement is false.
A polymer is a natural or manmade substance made up of large molecules termed macromolecules that are multiples of smaller chemical units known as monomers. Polymers are found in many living organisms and are the building blocks of numerous minerals and man-made things.
Back Pressure Flow is the resistance to the forward flow of polymer melt in an extruded barrel. The drag flow, on the other hand, is the forward motion of the polymer melt in the barrel induced by the Archimedian screw principle.
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