Step 1: Plastic granules are melted down and whit screwinjected into the mold.
Step 2: The mold is held under pressure (hold pressure) until the plastic material cools and hardens.
Step 3: Once the material ( plastic or metal) hardens, the mold is opened and the part is removed from mould.
Step 4 : Mould again closed and the process can be repeated.
All injection system use like this method.
Materials such as PS, nylon, PP and PE can be used in a process called injection moulding. These are thermoplastics.This means when they are heated and then pressured in a mould they can be formed into different shapes. Click a simple photo of an injection moulding machine is shown below.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgt09TWgjRob2gk-rkXIC2ZicABOhmQxnjkrgHF3XvAkga-OsT2a912eDXU4r8M2v-EntZ32XlhbcddjbwPx1BQMJOkyaKXS5_TsCQPXxirCAHcEhq0NdQlMEa5Gqw0tcdV9r2kCM6TdOFU/s400/injection-system.gif)
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