The natural color of PP plastic pepper ball is translucent, but the surface of the actually produced plastic pepper ball is yellowed. There are several reasons for the yellowing of the surface of PP plastic pepper ball.

The temperature of PP plastic pepper balls is too high during injection molding, and the physical properties will change somewhat after the materials pass through the high temperature in the injection molding machine, resulting in the yellowing of the plastic PP pepper balls. Another reason is that the nozzle material is added in the production of PP plastic pepper balls. Generally, the production of PP plastic pepper balls cannot be produced by adding a nozzle for the sake of stable quality. After adding a nozzle, The surface of the injection-molded plastic pepper ball will turn yellow. These are the main reasons for the surface yellowing of the PP plastic pepper ball. Of course, if the produced PP plastic pepper ball is not transparent, these factors need not be considered, because the colored PP plastic pepper ball will cover the yellow surface of the PP plastic pepper ball.