Polymer Processing Additives function by creating a dynamic, temporary fluoropolymer coating on the die surface.
The coating provides a low surface energy interface between the metal wall and the molten polymer stream. This reduces stress in the die, prevents drag and allows the melt to slip through the die more easily and without sticking- thereby eliminating melt fracture. In addition, the lowered apparent viscosity allows the polymer melt to flow more freely through the die, providing easier flow and pressure reduction.
Some of the many ways you could benefit from the use of PPAs: