| Injection molding is a manufacturing technique for | | | | The ejection phase is the last phase where the |
| making parts from both thermoplastic and | | | | removal of the cooled, molded part from the |
| thermosetting plastic materials. Heated, fluid plastic | | | | mold cavity is done. |
| is injected at high pressure into a mold, which is | | | | Pelletized or powdered materials that are used in |
| the opposite of the desired product shape. | | | | injection molding machines are mostly:o Ethyleneo |
| Injection molding is widely used for manufacturing | | | | Polystyreneo Polycarbonateo Polypropyleneo |
| a variety of parts, from the smallest component | | | | Acrylonitrile-Butadiene-Styrene (ABS)o Nylon |
| to entire body panels of car.The process of | | | | The use of these basic steps in sequence or as a |
| injection molding can be described in four simple | | | | cycle is the process of injection molding done to |
| steps. These include Plasticizing, Injection, Chilling, | | | | obtain or manufacture parts. Cycle time usually |
| and Ejection. Each of these steps is different | | | | ranges from 10 to 100 seconds and are controlled |
| from the other and the right procedure is required | | | | by the cooling time of the melted plastic. The |
| for the successful completion of the total process. | | | | melted plastic comes from hard plastic pellets that |
| These steps can be discussed as follows: | | | | are fed into the hopper of the injection-molding |
| Plasticizing | | | | machine. The pellets or plastic powder is melted |
| IT involves the conversion of the polymer | | | | inside the machine and then forced into the mold |
| material from its normal hard granular form at | | | | through a nozzle by a long screw within a heated |
| room temperatures, to the liquid which is | | | | cylinder. It is the most common method of |
| necessary for injection at its correct melting | | | | production, with some commonly made items |
| temperature. | | | | including bottle caps and outdoor furniture. |
| Injection | | | | Injection molding typically is capable of tolerances. |
| This is the stage during which this melt is | | | | Plastic molding applications are used in medical field |
| introduced into a mold to completely fill a cavity | | | | like components for blood analyzer equipments, |
| or cavities. | | | | heart pump parts, orthopedic devices and custom |
| Chilling | | | | knee braces. In automotive engineering it is used |
| It is the act of removing heat from the melt to | | | | for mechanical levers, gears, gaskets and |
| convert it from a liquid consistency back to its | | | | switches. It is also used for aerospace, |
| original rigid state. | | | | automotive, avionics and computer components. |
| Ejection | | | | |