What is the difference between the annealing temperature and the melting temperature in the context of polymer processing?

The annealing temperature is the temperature at which a polymer is heated to relieve internal stresses and improve its properties, without melting it. The melting temperature is the temperature at which a polymer transitions from a solid to a liquid state. In polymer processing, annealing temperature is used to improve the polymer's structure, while melting temperature is when the polymer becomes a liquid for shaping.