Plastic Injection Molding is a precise manufacturing process where molten resins are injected in a predesigned mold. As the part cools and hardens, it is then taken out of the mold for adding finishing touches. Tooling and mold design are an important aspect of injection molding.

Mold designing along with the various components involved (commonly known as tooling) is a very complex process that requires high levels of technical expertise. Additionally, the process calls for engineering know-how to produce plastic parts with accurate dimensions and design features. 

Additionally, it is important to carefully design the system of runners and gates to get an even distribution of plastic resin through the mold. It is also important to consider proper placement of cooling channels along the mold walls to create a homogenous product and eliminate defects that are common in plastic injection molding. 

Various gate types are designed depending on different requirements. However, the key factors determining the type, size, shape, and location of a gate are cooling time, tolerance, fill pressure and optimum flow conditions. Additionally, gates need to be carefully located to avoid defects like flow marks, warping, and shrinkage.