The proportion of plastic solid ball theory is the production of plastic raw materials and solid ball proportion is the same, but due to the production process conditions, the proportion of plastic solid spheres because of changes in the production of injection and production, the proportion of customer requirements when there is no plastic solid ball, can change without the concern of plastic solid sphere due to the proportion of production the conditions and produce, but the proportion of individual customers of plastic ball center has strict requirements, going through the adjustment of production molding conditions to produce plastic with solid ball proportion of customer requirements, specific methods are as follows: when the customer needs is more important than plastic solid ball or ball solid raw material proportion, to injection pressure, injection speed adjustment is the slowest, such plastic solid ball because of the pressure, density becomes larger and the corresponding proportion becomes larger, the injection speed The degree of adjustment for the slowest is to let the ball plastic mold cavity in the air will have sufficient time to discharge, which produces a plastic ball there won't be a bubble, the proportion of nature will not be reduced, if the customer need the plastic solid ball is less than or equal to the proportion of solid ball material proportion, to adjust the injection pressure is small, the injection speed is the fastest, as the injection pressure is small, plastic solid ball produce density is correspondingly smaller, injection speed fast, plastic ball in the air to die cavity was not discharged outside the mold, plastic ball will exist in the internal bubble formation, correspondingly. Increase the density of the same plastic ball, plastic ball density also becomes small.