What Is Runner System Of Injection Molds

When molten plastic material leaves the barrel through the nozzle, it is guided toward the mold

cavity, its final destination. Its flow path is called runner system, such as the sprue, runners.

gates. The runner is in a simple direct route or goes through a series of turns that the flow molter

material twists, and restrictions as it approaches the mold cavity. The molten plastic material flows

into this cavity, takes the configuration of this chamber in the shape and size, and is cooled from a

molten material to a solid workpiece of plastic material. There are many things along this pathway

that can affect the ultimately workpiece performance. The runner system will be reviewed as to

what they do and how they affect the molding process

There are many aspects to forming the molten material into its final solid workpiece that need

to be considered to fabricate a final end use workpiece. The clamp of the molding machine, process

of mold cooling, venting and shrinkage effects will be discussed. The clamp acts as the force to

resist the pressures needed to inject the part through and form the workpiece. The mold cooli

involves how to use a cooling medium properly to transfer this molten polymer into a solid polymer

mass.The cooling strength of molding will affect the characteristics of workpiece such as

crystallization, orientation of polymer or density. Venting unit affects the feature of workpiece of

injection molded and the injection process. The mold shrinkage also changes the final workpiece