Because of the high processing temperature of PSU plastic pepper ball, if the molded PSU plastic pepper ball is not annealed, it is easy to crack and deform during use, which affects the accuracy and service life. The solution to PSU stress cracking is mainly annealing.

The annealing method of PSU plastic pepper balls is mainly that the plastic blank balls after injection are immediately soaked in hot oil. Generally, the oil temperature is controlled at about 160 degrees for about 4 hours, so that the treated PSU plastic pepper balls have good toughness, high strength and long service life, and the most important thing is that they will not crack and deform.