The process of annealing is commonly used for improvement of machinability; improvement of mechanical or electrical properties; or increase in stability of dimensions. Plastic is one material that is heated in an annealing oven. During the machining of plastic parts residual stresses are induced. These stresses can affect the material strength and cause reduced wear resistance and cracking.  To prevent this, plastics are heated in an annealing oven. Annealing heats the plastic to just below its transition temperature for a prescribed period of time. Wisconsin Oven manufacturers plastic tempering and plastic annealing ovens in both batch and conveyor styles.