PP pepper ball is a kind of plastic hollow ball. PP pepper ball has the characteristics of environmental protection and safety, low material price, simple manufacturing process, environmental protection and safety. However, the hollow PP pepper ball is easy to produce wind and burr during the manufacturing process, and the strength of the hollow PP pepper ball is not high, which restricts the application of hollow PP ball.

During the manufacturing process of hollow PP pepper balls, it is easy to produce batch wind, which is mainly caused by the low hardness of the mold material for manufacturing the hollow PP pepper balls. During the injection process, the pressure is too high, and the mold of the hollow PP pepper balls will be deformed under the force. Although the displacement of the deformation is very small, batch wind will occur, which will bring bad hidden dangers to the subsequent manufacturing process of the hollow PP pepper balls. Therefore, the mold steel for producing the hollow PP pepper balls must be made of heat-treated and hardened mold steel.