Plastic ball POM high hardness, can replace part of the steel ball in the field of machinery, auto parts etc. (BB, Airsoft BBS), but in the process of production in the middle of the plastic ball POM easy to form small, seriously affecting the application of POM plastic ball in machinery and auto parts field, by internal in POM plastic ball, from the appearance is very difficult to detect, can only use special imported instruments can be detected (BB, Airsoft BBS), the detection cost is very high, the efficiency is very low, so in the production of the plastic ball POM intermediate solution is fundamental to solve the bad air, Dongguan City Jiaji plastic products limited company through the exploration and experiments for many years, summed up a set of effective methods and processes, today is here and share one of these aspects of the experience and technology, we must first know the plastic ball POM gas Hole is due to gas (BB, Airsoft BBS), so in the mold design and manufacturing to fully consider the factors, that is to say, the cavity in the air is full of discharge die. This cavity without air, would reduce POM plastic ball in the center hole, also in the injection molding process to the injection molding machine of the firing rate is adjusted to the slowest (BB, Airsoft BBS), melt into the mold cavity, the squeezed out of the air in the cavity die, so that the cavity is in a vacuum state, there is no air, nature also won't be in the interior of the POM plastic ball formation of pores.