Mold designers must have a  wealth of design and injection molding experience, you must consider  the relationship between these factors and injection molding conditions  and its apparent factors, such as injection pressure and cavity pressure  and filling speed, injection melt temperature and mold temperature,  mold Structure and gate form and distribution, as  well as the gate cross-sectional area, product wall thickness,  reinforced plastic filler content, plastic material crystallinity and  orientation and other factors. The above factors  also vary depending on the plastic material, or other molding conditions  such as temperature and humidity, continuous crystallization, and  changes in the injection molding machine after molding.