The specific material selected for a particular tool is normally determined by the mechanical properties necessary for the proper operation of the tool.

The sprue is the first channel that molten material is exposed as it goes from the harmer and nozzle into the mold and begins directing the molten plastic material toward the mold cavity.

The definition of injection molding is as a method of producing objects which is done by the use of an injection molding machine with a heat-meltable plastics material.

The injection machine takes plastic granules--raw material, heats them until molten, and the iects molten plastic material into the mold.

Resins are typically organic polymers of high molecular mass, but they often contain other substances.

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.

Practically stated, a plastic is an organic polymer, available in some resin form or some form derived from the basic polymerized resin.

​One of the common problems in injection molding is determining the shrinkage of a part to be injection molded.

Direct gate: The molten material directly enters the plastic mold cavity through the runner, which is suitable for shell / box plastic molds with a single cavity.